Thermal Interface Materials Apply in LED Lighting

Design challenges encountered in high-power LED lighting solutions are thermal design and thermal protection. A power and thermal management system is required for LED light sources because most of the electrical energy supplied to LEDs is converted to heat compared to other light sources. Without proper thermal management, this heat will affect the LED life and color output. Solving the heat dissipation problem of LED lighting fixtures is an indispensable link in the lighting design.

The thermally conductive materials commonly used in LED lighting fixtures are mainly divided into: structural thermally conductive materials and filling thermally conductive materials according to their functions in the lamps.

In addition to the function of the shell of the lamp, the structural thermal interface material is also used for the heat dissipation of the LED light source, such as thermal conductive plastics. The complementary thermal interface material is mainly used between the heating element and the heat dissipation element, as the connection between the two is used for heat conduction. Since the thermal conductivity of the thermal interface material relative to the heating element and the metal heat sink is low, the choice of the thermal interface material is also very important. Crucially, this determines how fast the heat is transferred.

The following are several thermal interface materials for high-power LED solutions:

Thermal grease: It has the characteristics of excellent thermal conductivity, electrical insulation, use stability, high and low temperature resistance, etc. It is a commonly used thermal conductive material for high-power LED lighting;

Thermal silicone pad: fill the air gap between the heating device and the heat sink or metal base to achieve heat transfer between the heating part and the heat dissipation part, and also play the role of insulation and shock absorption, which can meet the requirements of miniaturization and ultra-thin Design requirements, the ease of use is unmatched by thermal grease;

Thermal adhesive tape: Bonding between the heating sheet and the heat sink is simple and convenient to use, which is beneficial to improve production efficiency.

Potting compound: a room temperature curing one-component silicone adhesive sealant, non-corrosive to most metals; has excellent resistance to cold and heat alternating performance, aging resistance and electrical insulation performance, excellent moisture resistance, Shock resistance, corona resistance, anti-leakage performance.

At present, thermally conductive materials such as thermal conductive grease, thermal pads, thermal double-sided adhesive tape, and potting compound have been widely used in LED lighting solutions; CoolThermo, as a thermally conductive material manufacturer, is committed to providing customers with comprehensive solutions for LED lighting. , to meet customer one-stop purchasing needs.

What Is Thermal Conductive Material? What Is The Different?

When it comes to cooling systems, most people think of fans and heat sinks, often ignoring one of the less visible but important mediators—the thermal conductive material. So, do you know the types of commonly used thermal conductive materials? What are their advantages and disadvantages? We together look!

Thermal gasket

Thermal gaskets are referred to as thermally conductive gaskets. They are used to fill the air gap between the heating element and the heat sink or metal base. Their flexible and elastic characteristics allow them to be used to cover very uneven surfaces. Heat is conducted from discrete components or the entire PCB to the metal enclosure or diffuser plate, increasing the efficiency and lifespan of heat-generating electronic components.
In the use of thermal pad, pressure and temperature are mutually restricted. With the increase of temperature, after the equipment runs for a period of time, the thermal pad material will soften, creep and stress relaxation, and the mechanical strength will also be reduced. down, the pressure of the seal decreases.

Advantage:

(1) Pre-formed thermally conductive material with ease of installation, testing, and reusability;
(2) Soft and elastic, good compressibility, able to cover very uneven surfaces;
(3) It has the effect of buffering, shock absorption and sound absorption under low pressure;
(4) Good thermal conductivity and high-grade withstand voltage insulation;
(5) Stable performance, no oil leakage at high temperature, and high cleanliness.

Shortcoming:

(1) The thickness and shape are preset, and the thickness and shape will be limited when used;
(2) The thickness of the thermal pad with a thickness of less than 0.3mm is complex, and the thermal resistance is relatively high;
Application environment: When the gap between the heat-generating component and the heat sink is large, the heat-generating component and the shell conduct heat.

Thermal Grease

Thermal grease, also known as thermal conductive grease, thermal paste, etc., is the most widely used thermal conductive medium at present. An ester-like substance formed after decompression, grinding and other processes, the substance has a certain viscosity and no obvious graininess. It can effectively fill various gaps.

advantage:

(1) Exist in liquid form with good wettability;
(2) Good thermal conductivity, high temperature resistance, aging resistance and waterproof properties;
(3) Insoluble in water, not easy to be oxidized;
(4) It has certain lubricity and electrical insulation;
(5) Low cost.

shortcoming:

(1) It cannot be smeared on a large area and cannot be reused;
(2) The product has poor long-term stability. After continuous thermal cycles, it will cause liquid migration, leaving only the filling material, and the surface wettability will be lost, which may eventually lead to failure;
(3) Due to the different thermal expansion rates of the materials on both sides of the interface, a “gas-filled” effect is caused, resulting in an increase in thermal resistance and a decrease in heat transfer efficiency;
(4) It is always liquid and difficult to control during processing, which is easy to cause pollution to other components and waste of materials, increasing costs.
Application environment: Between the high-power heating components and the radiator, the heat-dissipating components need to have their own fixing devices.

Thermal conductive double-sided adhesive

Thermal conductive double-sided tape is referred to as thermal tape, which is composed of acrylic polymer and silicone adhesive.

Advantage:

(1) It has both thermal conductivity and adhesive properties;
(2) It has good caulking performance;
(3) The appearance is similar to double-sided tape, and the operation is simple;
(4) Generally used for some electronic parts and chip surfaces with less heat generation.

Shortcoming:

(1) The thermal conductivity is relatively low, and the thermal conductivity is general;
(2) It is impossible to glue and fix heavy objects;
(3) Once the thickness of the tape is exceeded, effective heat transfer cannot be achieved with the heat sink;
(4) Once used, it is not easy to disassemble, there is a risk of damage to the chip and surrounding devices, and it is not easy to disassemble completely.
Application environment: It is usually used between a heat source with low power and a small heat sink to fix the LED heat sink, etc.

Thermal Gel

Thermal conductive gel is a gel-like thermal conductive material made of silica gel composite thermal conductive filler after stirring, mixing and potting. This material has some advantages of thermal pad and thermal grease at the same time, and better makes up for the weaknesses of both. Thermal gel inherits the advantages of good affinity, weather resistance, high and low temperature resistance, and good insulation properties of silicone materials. At the same time, it has strong plasticity and can meet the filling of uneven interfaces, and can meet the heat transfer requirements in various applications.

Advantage:

(1) Compared with the thermal conductive gasket, the thermal conductive gel is softer and has better surface affinity, and can be compressed to a very low thickness, which significantly improves the heat transfer efficiency, and can be compressed to 0.08mm;
(2) The thermal gel has almost no hardness, and will not cause internal stress to the equipment after use;
(3) The thermal conductive gel can be directly weighed and used. The commonly used continuous use method is the glue dispenser, which can realize fixed-point quantitative control, save labor and improve production efficiency.

Shortcoming:

(1) The cost is high;
(2) The process is more complicated.
Application environment: between high-power heating components and radiators, it can be used for quantitative control of dispensing machines.

Thermal silica glue ( RTV )

Thermal conductive glue, also known as thermally conductive silica gel, is made of organic silica gel as the main body, adding polymer materials such as fillers and thermally conductive materials, and kneading silica gel, which has good thermal conductivity and electrical insulation properties, and is widely used in electronic components.

Advantage:

(1) Thermal interface material, which will be cured, has adhesive properties and high adhesive strength;
(2) After curing, it is an elastic body, which is resistant to impact and vibration;
(3) The cured product has good thermal conductivity and heat dissipation function;
(4) Excellent high and low temperature resistance and electrical properties.

Shortcoming:

(1) Not reusable;
(2) The caulking gap is general;
(3) The curing time is longer.
Application environment: thermally conductive silica gel can be widely used in various electronic products, the contact surface between the heating body and the heat dissipation facilities in the electrical equipment, which acts as a heat transfer medium and has the properties of moisture, dust, corrosion and shock resistance.

Thermal potting compound

Thermal potting compound is commonly divided into silicone rubber system and epoxy system, silicone system is soft and elastic, and epoxy system is hard and rigid; it can meet the requirements of large depth of thermal conductivity potting. Improve the resistance to external vibration and improve the insulation and waterproof performance between internal components and circuits.

Advantage:

(1) It has a good waterproof sealing effect;
(2) Excellent electrical properties and insulation properties;
(3) It can be disassembled and repaired after curing.

Shortcoming:

(1) The heat conduction effect is general;
(4) The process is relatively complicated;
(5) poor bonding performance;
(6) The cleanliness is average.
Application environment: potting protection of power modules.

Thermally conductive silicone cloth

Thermally conductive silicone cloth is a silicone polymer elastomer reinforced with glass fiber cloth as a base material.

Advantage:

(1) It can effectively reduce the thermal resistance between the electronic components and the heat sink;
(2) Electrical insulation, with high dielectric strength, good thermal conductivity, and high chemical resistance;
(3) It can withstand circuit short circuit caused by high voltage and puncture of metal parts. It is an excellent thermal insulation material to replace traditional mica and silicone grease.

Shortcoming:

(1) The thermal conductivity is not high;
(2) The thickness and shape are preset, and the thickness and shape will be limited when used.
Application environment: filling between heat source and heat dissipation module or shell, insulation filling between live heating element and shell, etc.

Phase change material ( PCM )

Phase change materials refer to substances that change shape with temperature changes and can provide latent heat. The process of a phase change material from solid to liquid or from liquid to solid is called a phase change process.

Advantage:

(1) It can be repaired and reused, and the coating thickness and shape can be controlled as needed;
(2) It is solid at room temperature, but melts to fill the micro-gap during the operation of the equipment (no vertical flow);
(3) The thermal conductivity is equivalent to the traditional thermal grease, with better performance;
(4) Excellent substitute for silicone grease, there is no phenomenon of traditional silicone grease and silicone oil volatilizing, drying and aging.
(5) There is no glue overflow phenomenon of general silicone grease.
(6) Compared with thermal grease, there is no “inflatable” effect, and it has high reliability for long-term use;
(7) It can be dispensed, screen printed, and manually coated, and can be fully automated to greatly increase production;
(8) Environmentally friendly, in line with Rohs standards.

Shortcoming:

(1) It is not easy to store;
(2) Transportation, the cost is relatively high.
Application environment: on the cooling module.

Different thermal conductive materials have their own characteristics. No matter which thermal conductive material is used, there is no way to meet the heat dissipation needs of all electronic devices, and it has more or less some of its shortcomings. The advantages are magnified.

What is thermal adhesive tape?

Thermal adhesive tape is also called thermally conductive tape. Thermal adhesive tape is made of acrylic polymer mixed with thermally conductive ceramic powder, coated on both sides of glass fiber cloth, and compounded with silicone adhesive. It has the characteristics of high thermal conductivity and insulation, and has certain properties. Excellent softness, compressibility, conformability, strong viscosity, and a wide temperature range.

Consistent with the working principle of thermally conductive silica gel, the thermal adhesive tape is also filled on the uneven surface, so that the heat sink and the heat source are closely attached together, so that the original air conducts heat into the current thermal adhesive tape.

Thermal tape is widely used in bonding heat sinks, heat dissipation modules, CPU microprocessor heat dissipation, LED lamps and lanterns, filling the gaps between PCB, metal components and chassis, not only filling uneven surfaces, but also The heat is conducted out, and it can be used without changing any components even in a closed space, which fully reflects the thermal conductivity of this thermally conductive material and the self-adhesive properties of the pressure-sensitive adhesive tape for easy use.

The thermal adhesive tape is simple and convenient to operate and has high work efficiency. When using it, you only need to tear off the release paper (peeling paper) on the surface of the thermal adhesive tape, and then stick the adhesive surface on the surface of the device and press it gently to bond immediately. . The electronic components and the radiator do not need to be mechanically fixed and the liquid adhesive is cured and fixed.

Thermal adhesive tape can be divided into with or without substrate and without substrate according to the different production materials. It can also be divided according to the composition of the substrate and the composition of the glue. Its main material components are divided as follows:

  1. With or without base material;
  2. No substrate, tissue paper, PET, foam, non-woven fabric, cloth;
  3. Water-based acrylate, oil-based acrylate, solvent-based rubber, hot melt adhesive and silicone.

Characteristics of thermal adhesive tape

  1. High thermal conductivity. Superior heat transfer, thermal conductivity and heat dissipation. The thermal conductivity of the thermal adhesive tape is 0.8-1.0W/m.k, which solves the problems of difficult operation of the thermal conductive paste, uneven coating, and defective products caused by overflowing glue.
  2. Anti-aging. The working environment of thermal adhesive tape is generally in high heat, high temperature, large temperature difference, and rich in ultraviolet rays. Therefore, it is required that the thermal conductive tape must be able to withstand low temperature (below -20°C), high temperature resistance (above +120°C), and at the same time resist the perennial exposure of ultraviolet rays. Working in a variety of complex environments will not result in a decrease in thermal conductivity.
  3. Replace rivets and other mechanical operations. When the traditional LED assembly is considered by the cost of human resources, reducing the process and improving the product become the only choice for the LED industry. More and more LED companies are thinking about using thermal adhesive tape tape to replace traditional mechanical operations such as rivets and screws, which not only play a role in fixing, but also give full play to the role and function of thermal adhesive tape.
  4. Shock absorption function. The thermal adhesive tape is made of acrylic (acrylic) substrate by fully blowing air into it, and it has shock-proof and shock-absorbing functions.

Today, with the continuous research and development of high-tech, the thermal conductive material industry also keeps pace with the times. In the electronics industry, thermal adhesive tape plays a very central role. Since it is difficult for general thermally conductive materials to have both thermal conductivity and good adhesion to important electronic parts, thermal adhesive tape completely solves this problem. ; Especially in the electronics, LED lighting industry and LED TV field has played a significant role.

Facing new requirements and new technical challenges, the thermal adhesive tape industry will usher in different changes. In today’s increasingly developing world, thermal adhesive tape manufacturers rely not only on technology and quality, but also on service and reputation as a major competitive advantage.

What Are The Special Attribute Words For Thermal Adhesive Tape?

As an adhesive, thermal conductive tape is often used in product use to explain its production and use process. Let’s take a look at it.

  1. The adherend: The object to be bonded or the objects on both sides of the adhesive layer after bonding.
  2. Substrate: The material used to coat the adhesive on the surface. Also become a sticky.
  3. Adhesive layer: The adhesive layer in the adhesive part.
  4. Glue overflow: The adhesive extruded from the glue layer after the assembly is pressurized.
  5. Curing degree: The degree of chemical reaction characterized when the adhesive is cured.
  6. Aging: The phenomenon that the performance of the adhesive parts changes with time.
  1. Drying and heat conduction: The process of reducing the solvent or dispersion medium through evaporation and absorption on both sides to change the physical state of the adhesive on the adherend.
  2. Curing: The process in which the adhesive obtains and improves the properties such as bonding strength through chemical reactions (polymerization, cross-linking, etc.).
  3. Laminated: Thermally conductive double-sided In laminated products, the phenomenon of interlayer separation caused by the failure of adhesives, adherends or their interfaces.
  4. Viscous: after the adhesive contacts the adherend, a little pressure is applied immediately to form a property of considerable adhesive strength.

How To Apply Thermal Adhesive Tape?

Thermal adhesive tape is also called thermal tape. Thermal adhesive tape is made of acrylic polymer mixed with thermal ceramic powder, coated on both sides of glass fiber cloth, and compounded with silicone adhesive. It has the characteristics of high thermal conductivity and insulation, and has certain properties. Excellent softness, compressibility, conformability, strong viscosity, and a wide temperature range.

Thermal adhesive tape is widely used in bonding heat sinks, heat dissipation modules, CPU microprocessor heat dissipation, LED lamps and lanterns, filling the gaps between PCB, metal components and chassis, not only filling uneven surfaces, but also The heat is conducted out, and it can be used without changing any components even in a closed space, which fully reflects the thermal conductivity of this thermally conductive material and the self-adhesive properties of the pressure-sensitive adhesive tape for easy use.

So what are the steps to use the thermal adhesive tape?

The thermal adhesive tape should pay attention to the operation method when bonding. It is strictly forbidden to touch the surface with hands or other non-adhesive objects, and it is strictly forbidden to repeatedly peel it. The bonded surface should be kept clean and dry. affect the bond strength.

Auxiliary supplies: cotton cloth, industrial cleaner, rubber gloves.

Step 1: Clean the surface of the device with a lint-free cotton cloth.

Step 2: Use a cotton cloth soaked in industrial cleaner to clean the surface of the device to remove grease, and do not touch the clean surface during installation.

Step 3: Tear off the protective film on one side of the adhesive, do not touch the adhesive surface with your fingers.

Step 4: Stick it on the surface of the device, and press lightly for five seconds from the center of the bonding area to the surrounding area to ensure that the double-backed tape is in complete contact with the surface of the heat sink.

Step 5: Tear off the protective film on the other side of the backing tape and follow the same method as the third and fourth steps to make the double-backed tape and the chip stick firmly.

What is thermal double-sided tape? What are the types of thermal tape? What are the characteristics? How to choose?

What is thermal tape?

The main purpose of double-sided tape is to paste the surfaces (contact surfaces) of two objects together, which can be divided into temporary fixing and permanent bonding according to actual requirements. Double-sided tape is a roll-shaped adhesive tape made of paper, cloth, film, foam, etc. as the base material, and then evenly coating the adhesive on both sides of the above-mentioned base material. Paper (release film) consists of three parts. Depending on the substrate, some substrates require surface treatment before gluing.

Due to the wide selection of substrates and adhesives and the possibility of different combinations, there are more types of double-sided tapes than other types of tapes.

Overview of the classification and characteristics of double-sided tape:

  1. Double-sided tape for PET substrate: good temperature resistance and strong shear resistance, generally long-term temperature resistance 100-125 °C, short-term temperature resistance 150-200 °C, thickness is generally 0.048-0.2MM, suitable for nameplate, Bonding of LCD, decorations and decorative parts.
  2. Double-sided tape for non-woven substrates: good viscosity and processability, generally long-term temperature resistance of 70-80 °C, short-term temperature resistance of 100-120 °C, thickness is generally 0.08-0.15MM, suitable for nameplates, plastic stickers Heating, automotive, mobile phone, electrical appliances, sponge, rubber, signage, paper products, toys and other industries, home appliances and electronic instrument parts assembly, display lenses.
  3. Double-sided adhesive without substrate: it has excellent bonding effect, can prevent falling off and excellent waterproof performance, good processability, good temperature resistance, short-term temperature resistance 204-230 ℃, general long-term temperature resistance 120-145 ℃ , the thickness is generally 0.05-0.13MM, suitable for the bonding of nameplates, panels and decorative parts.
  1. Foam double-sided adhesive: refers to a double-sided adhesive formed by applying strong acrylic adhesive on both sides of the foamed foam substrate, and then covering one side with release paper or release film. Forming paper or release film is called sandwich double-sided tape, and sandwich double-sided tape is mainly used to facilitate double-sided tape punching. Foam double-sided tape has the characteristics of strong adhesion, good retention, good waterproof performance, strong temperature resistance and strong UV protection. Foam foam substrates are divided into: EVA foam, PE foam, PU foam, acrylic foam and high foam. The glue system is divided into: oil glue, hot sol, rubber and acrylic glue.
  2. Hot melt adhesive film: It has good consistency, uniform bonding thickness, no solvent, easy processing, good adhesion to many objects, thickness is 0.1MM, color is translucent/amber, hot Melt softening temperature 116-123 ℃. It is suitable for the bonding of nameplates, plastics and hardware. Good results can also be obtained by bonding on uneven surfaces. The recommended initial bonding conditions are: temperature 132-138 ℃, bonding time 1-2 seconds, pressure 10 -20 psi.

How to choose thermal double-sided tape?

Speaking of double-sided tape brands, there are many on the market, but double-sided tape brands with good reputation and guaranteed products still need to be carefully compared to determine. The same is true when choosing double-sided tape. You need to shop around and choose a double-sided tape with guaranteed quality and environmental protection according to your own needs, so you can use it with confidence!

There are many types of double-sided tapes and a wide range of applications, but because each type of double-sided tape uses different adhesive materials, the fields of application of each type of adhesive are different. Therefore, when purchasing double-sided tape, you must not only choose the brand, but also choose according to the function used!

Double-sided tape is a very practical invention in modern society, whether it is mobile phones, computers, etc. in the electronic market, or decorative strips and parts in the automotive market, and then to hooks, furniture, toys, etc. in the home market, double-sided tape all play an irreplaceable role.

What is high temperature tape? What are the types of high temperature tapes? What are the factors that affect the use of high temperature tape?

What is high temperature tape?

High temperature tape, that is, the adhesive tape used in high temperature working environment. Mainly used in the electronic industry, the temperature resistance is usually between 120 degrees and 260 degrees. It is often used for painting, varnishing leather processing, painting and masking and fixing in the process of electronic parts, printed circuit boards and high-temperature treatment masking.

What kinds of high temperature tapes are there?

  1. High temperature resistant masking tape

High temperature masking tape is mainly used for sealing, baking paint, spray painting, packaging and fixing, building decoration and other industries, as well as the spray shielding protection of high temperature baking paint such as plastic and metal parts.

  1. Teflon high temperature tape

Teflon high temperature tape can be widely used in packaging, thermoplastics, composite materials, heat sealing, electrical and electronic industries. If the fabric is reinforced with Teflon high temperature tape, it will have higher strength properties and can be used in industries such as sizing machines, thermoplastic release rolls, etc.

  1. Polyimide high temperature tape

Polyimide high temperature tape is widely used for welding protection, high temperature insulation and binding of transformer coils; capacitor insulation materials, PCB gold finger high temperature spray shielding protection, and mobile phone lithium battery manufacturing and binding. Polyimide high temperature insulating tape is based on polyimide film and is coated with high temperature resistant silica gel, which has extremely high temperature resistance and can be used to protect gold fingers during reflow soldering.

  1. PET high temperature tape

PET high temperature tape is mainly used for high temperature spray shielding protection and insulation of electronic products, automotive industry, coatings and other products, and there is no residual adhesive after being made. At the same time, it can also be used for the production of fixed printed circuit boards, electronic parts, resistors and capacitors, as well as household appliances, machinery, electronics and other industries that require high temperature coating protection, high temperature bonding and fixing.

Reasons why high temperature tape cannot be used normally

  1. Types of adherends. The adherends of different materials have different internal molecular structures and different surface roughness, which affect the bonding effect of the product. The PET high-temperature tape suitable for adhesion should be selected according to the surface roughness of the adherend.
  2. There are foreign objects on the surface. Dust, oil stains, water stains and other foreign objects on the surface of the adherend will make the PET high temperature tape unable to be used normally, so the surface of the adherend needs to be cleaned before use.
  3. Adhesive pressure. When pasting PET high-temperature tape, the applied pressure directly affects the tightness of the adhesive tape and the adherend.
  4. Use the environment. As we all know, PET high temperature tape is suitable for use in high temperature environment. If the temperature is too low, PET high temperature tape will not be used normally.
  5. Other reasons. Such as product expiration, unqualified storage environment, mismatch of process parameters, etc.

When it is found that the high-temperature tape cannot be used normally, you can find out the reasons according to the above situations, so as to solve the problem.

Five factors affecting the use of high temperature tape

  1. The temperature of the high-temperature tape also has a certain influence on the double-sided tape: whether the tape is resistant to high temperature, low temperature, and shear resistance after heating in the short term or long term;
  2. The influence of high temperature tape on other external factors are: color, transparency, odor, thickness, filling degree, fogging, insulation and so on.
  3. Processing related to: high temperature tape die-cutting performance, manual tearing, tear resistance is related to mechanical processing, elasticity, fluidity, dissociation performance, resetting performance, residual glue residue, repeated use, etc.;
  4. Environmental impact: Solvent, moisture, moisture, plasticizer, sunlight or ultraviolet rays, aging, etc. will affect the adhesiveness of double-sided tape;
  5. External force of high temperature tape: affected by peel strength, professional term refers to the influence of polar materials, non-polar materials and rough surface materials, initial adhesion, initial and final peel strength, top shear force, shear resistance strength, tensile strength, shock resistance, etc.

What is substrateless thermal double-sided tape? What is the function of substrateless thermal tape? What are the features?

Double-sided tape is well-known as a daily packaging material, and it is very convenient to use. It is deeply loved by us and has a wide range of applications. Double-sided adhesives can be divided into substrate double-sided adhesives and non-substrate double-sided adhesives according to the substrate. The previous CoolThermo thermal conductive silica gel introduced organic double-sided adhesives “What is thermally conductive double-sided adhesive? The content of “Introduction to the Process Principle and Application Characteristics of Thermal Double-sided Adhesive Tape”, today Nuofeng Thermal Conductive Silica Gel will share it!

Overview of Double-sided Adhesives Without Substrates

The double-sided tape without substrate is made of water-resistant kraft paper, white glassine paper or transparent PET that is directly coated with acrylic adhesive and then attached with polymer coating without any medium. The color of this tape is transparent, The thickness is very thin, has good bonding ability, can effectively prevent falling off, has good waterproof performance, can be processed, strong temperature resistance, dimensional stability, thermal stability, good chemical stability.

The substrate-free thermally conductive double-sided adhesive comprises: an adhesive tape and a release film, the release films are arranged on both sides of the adhesive tape; the adhesive tape is composed of a colloidal matrix and a thermally conductive material, and the colloidal matrix is pressed into a sheet shape. The non-substrate thermally conductive double-sided adhesive has the advantages of high reliability, good thermal conductivity, high temperature resistance, convenient manufacture, easy pasting, convenient punching, and low price. At the same time, it has a broad market prospect in the electronics industry.

Characteristics of non-substrate double-sided tape

  1. Colorless, transparent pure film tape;
  2. Initial stickiness, good continuous stickiness;
  3. High cohesion, good plasticization resistance and excellent die-cutting performance;
  4. No glue residue, glue overflow, chemical stability, resistance to organic solvents, disinfectants, oils, weak acids, salt erosion;
  5. It can be used in various harsh environments for a long time.

Substrate-free double-sided tape application

  1. Nameplates, labels, signs: used in screen printing, advertising, aviation, medical and industrial equipment, automobiles, home appliances, electronic markets and other industries;
  2. Soft board FPC: used in mobile phones, notebook computers, PDAs, digital cameras, LCMs and other electronic products;
  3. Membrane switches: membrane switches of flexible, rigid, concave and convex categories;
  4. Shockproof foam: good initial viscosity and stickiness, high cohesion, and good plasticization resistance.

When using double-sided tape without substrate, attach the tape to the surface to be bonded, and after pressing, peel off the release paper, which provides strong adhesion, high temperature resistance, high solubility, and excellent weather resistance. It is effective when combined with various substances, and the punching processability is also good.

Can thermal conductive double-sided adhesive replace silicone grease? What are the advantages of thermal tape over thermal grease?

In order to solve the problem of heat dissipation of electronic and electrical products and ensure the stability and performance of products, different types of thermally conductive materials are usually used.

Thermally conductive double-sided tape is a thermally conductive material used for bonding heat sinks and other power-consuming semiconductors. effect. In terms of adhesion performance, many common thermally conductive materials are not sticky, such as thermal conductive silicone grease, which is not easy to stick to important parts of electronic products and cannot be effectively fixed on the surface of the chip. When encountering such working conditions, thermal conductive double-sided adhesive should be considered It replaces the thermal grease solution, because the thermally conductive double-sided adhesive can cleverly fill the middle with thermally conductive material, which has excellent thermal conductivity and strong viscosity, which can solve the problem of bonding and fixing electronic components.

In terms of thermal conductivity, the thermal conductivity of thermally conductive double-sided tape is better than that of general thermally conductive stickers. The thermal conductivity is high and stable. It can work for at least 5 years at room temperature, which greatly improves the life of electronic components. The only choice. In addition, the thermal conductive double-sided tape is the same as the thermal conductive silicone sheet. It can be die-cut into any shape according to the needs during production. It can be bonded with light pressure during use. The bonding strength increases with time and temperature. Has good convenience and practicality. At present, it is widely used in electronic products such as LEDs, mobile phones, computers, home appliances, and auto parts to dissipate heat.

Compared with thermal conductive silicone grease, thermal conductive double-sided adhesive has the following seven advantages:

  1. Good viscosity; in the normal use environment of lamps, the viscosity increases with the increase of temperature, there is no volatility, and the phenomenon of thermal paste drying and powdering will not occur.
  2. Good insulation performance; high voltage resistance 3KV, convenient for customers to pass the certification.
  3. Good thermal conductivity; avoids the systematic risk caused by uneven paste application (uneven heat dissipation of the light source leads to fast light decay and dead light).
  4. No need for fasteners (screws); save the cost of screws, improve the consistency of production efficiency and finished products, save workers’ working hours, and save costs from the perspective of production management.
  5. The construction is convenient, clean and fast. The product is beautiful and reflects the professionalism of the manufacturer.
  6. It is convenient for storage and does not require special environment; avoid curing, volatilization and recessive failure of the thermal conductive paste when the environmental conditions change.
  7. The size and shape can be customized; for different types of LED products, it is truly customized and dedicated to special products.
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