What is a high temperature sealant? How long does the high temperature sealant take to dry? Basic overview of high temperature sealant

Basic overview of high temperature sealants

High temperature sealant, as the name suggests, is used for bonding and sealing protection in the environment under high temperature conditions. It is a one-component silicone paste sealant, industrial use, high-quality sealing compound, suitable for smooth and flat sealing surface ( Butt joints) with high temperature and pressure conditions.

Silicone high temperature sealant is a high temperature sealing adhesive made of organic silica gel as the main body, defoamer, leveling agent, curing agent and other polymer materials.

The limit of high temperature resistance of sealant

  1. High temperature resistant sealant is a high temperature resistant silicone sealant, which can be continuously maintained at -65°C without affecting performance. It can withstand high temperature intermittently, has long-lasting elasticity, good high temperature sealing function and high electrical insulation function , Excellent anti-oil, anti-grease and anti-vibration properties, it is a special colloid that has strong interstitial ability, wide operating temperature range, high pressure resistance, corrosion resistance and oil-carrying conditions.
  2. A variety of special additives are added to the high temperature-resistant sealant, and the inorganic structural adhesive with high temperature resistance to 538 ℃ is prepared by mixing. Drops or shortens due to changes in heat and cold.
  3. The fully cured silicone sealant can continue to be useful when the temperature reaches 204°C (400oF), but when the temperature is as high as 218°C (428oF), the useful time will be shortened.
  4. It is a silicone structural sealant, and its construction temperature range should be controlled between 5-40 °C. After full curing, its useful temperature should be kept at 204 degrees, and its useful life will be shortened when it exceeds 218 degrees.
  5. The high temperature sealant can be used in the temperature range of -55℃ to 200℃, and the higher temperature should not exceed 250℃ in a short time.

How long does the high temperature sealant take to dry?

  1. Sticking time

Different properties of silicone surface dry time and curing time are not the same. Acid glue, neutral transparent glue should generally be 10 minutes, neutral variegated glue should generally be 30 minutes.

  1. Curing time

(1) The curing time of the high temperature sealant increases with the increase of the bonding thickness. For example, the acid sealant with a thickness of 12 mm may take 3 to 4 days to fully solidify, but in this process, it is generally 24 hours The inner 3mm outer layer is cured.

(2) If the place where the sealant is used is partially or completely closed, the curing time is determined by the tightness of the seal. In an absolutely airtight place, it is possible to remain uncured forever.

How to use high temperature sealant

  1. Put the rubber nozzle on the hose, and then cut the nozzle obliquely;
  2. Clean the surface of the product material, and apply glue on the bonding and sealing position of the product;
  3. Aim at the bonding part and paste it, and press it to fit tightly;
  4. The initial positioning time is about 15-30 minutes, and the test is done after 24 hours.

What should I pay attention to when using high temperature sealant?

  1. The bonding surface should be kept dry and tidy, and there should be no residue of dust or oil.
  2. Cut the beak according to the actual needs, try not to cut it as large as possible, so as to avoid waste.
  3. The adhesive layer needs to be scraped flat before the surface is dry. Once cured, it will not be able to be scraped.
  4. After the sealant is completely cured, cut off the excess part directly with a blade.

Some industries do not have special requirements for the temperature resistance of sealants, and ordinary sealants can be selected. If the temperature of the working environment is too high, ordinary products cannot resist high temperature, and high temperature sealant can be used. It can be used for a long time at high temperature and will not be easily melted.

What is the role of electronic potting compound? Why do electronic products use potting glue for potting protection?

With the vigorous development of the electronic industry, people pay more attention to the stability of products, and have more stringent requirements for the weather resistance of electronic products. Therefore, more and more electronic products now need to be potted, and the potted electronic products can enhance their performance. Waterproof ability, shock resistance and heat dissipation performance, protect electronic products from the erosion of natural environment and prolong their service life. Today, CoolThermo will explain to you what is the role of electronic potting glue? Why do electronic products use potting glue for potting protection?

Electronic potting glue can strengthen the integrity of electronic devices, improve the resistance to external shock and vibration; improve the insulation properties between internal components and lines, which is conducive to the miniaturization and light weight of devices; avoid direct exposure of components and lines, and improve the device waterproof and moisture-proof performance. It has been widely used in the manufacturing of electronic devices and is an indispensable and important insulating material in the electronic industry.

With the rapid development of electronic products, the precision of electronic products is also continuously improved, which can easily cause the junction temperature of electronic components to overheat, cause electronic products to malfunction, and affect the service life of electronic products. In order to solve this situation, manufacturers generally pour electronic potting glue into electronic products as a thermal conductive material to efficiently conduct the temperature inside the electronic product to the heat dissipation shell, thereby improving the heat dissipation capacity of the electronic product. It can be seen that one of the reasons for the use of potting glue in electronic products is that in addition to the shock resistance of the cured package, it must also have good thermal conductivity and heat resistance.

It is worth mentioning that the use of potting glue for electronic products is because the potting glue has excellent performance characteristics during the potting process and after it is fully cured. When potting, the viscosity is small, the impregnation is strong, and it can be filled with components and caulking. The glue of each component is easy to store and has a long pot life. It is suitable for large-scale automatic production line operations. During the curing process, the powder components such as fillers settle very quickly. Small and not layered. After complete curing, it has the properties of flame retardant, weather resistance, thermal conductivity, high and low temperature resistance, waterproof and so on. The cured product has excellent electrical and mechanical properties, good heat resistance, low water absorption and linear expansion coefficient.

The waterproof function in the performance of potting glue can be effectively reflected in some electronic products. For example, in the process of washing clothes, electronic products such as mobile phones are more likely to slip into the water. etc. The injury is undoubtedly fatal while filling the electronic potting compound. It can prevent moisture from entering the battery, memory, and motherboard. Of course, there are differences in the waterproof performance of different brands of electronic potting compounds, so it is very important to buy high-quality electronic potting compounds. Solutions, the strength is trustworthy.

Electronic products are sometimes used in environments with relatively large vibrations, and electronic potting compounds have good elasticity, which can effectively improve the shock resistance of electronic products. In a relatively large vibration environment, electronic products still maintain good performance. Electronic potting glue not only has the functions mentioned above, but also has the functions of dustproof and heat dissipation. This ensures that the electronic product is used in an excellent environment, which is very helpful for extending the service life of the electronic product.

What is the function of the above electronic potting glue? Why do electronic products use potting glue for potting protection? For more information about potting adhesives, please visit www.coolthermo.com to view!

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