Can Silicone Adhesive Sealants Be Used For Plastic Bonding? What Are The Reasons Why Silicone Adhesives Are Not Sticky To Plastics?

Can Silicone Adhesive Sealants Be Used For Plastic Bonding? What Are The Reasons Why Silicone Adhesives Are Not Sticky To Plastics?

Recently, a customer asked on the official website of CoolThermo Technology whether silicone adhesive sealant can be used for plastic bonding? The answer is yes. Silicone bonding sealants are adhesives for silicone materials that can bond metals, plastics, rubber, glass ceramics and other materials. Widely used in aerospace, aircraft manufacturing, electronic industry, machining, automobile manufacturing, construction, medical and so on.

What is the reason why silicone adhesives are not sticky to plastics?

Silicone adhesive sealant does not stick to plastic mainly because it has no adhesion, peeling off the colloid, no glue residue on the plastic, or little glue residue locally. If the application of silicone adhesive sealant is in a non-adherent state, the function that can be exerted will be greatly weakened, and in severe cases, there will be no application performance. So what are the reasons why silicone adhesive sealants are not sticky to plastics? Today, NFION will explain to you the following.

Substrate contamination

One of the key factors for the adhesion of silicone adhesive sealants is the adhesive area. The smaller the adhesive area, the smaller the corresponding adhesion. For example, during the storage process of the product, it is affected by dust and moisture in the air. The contamination of the adhesive will cause the bonding surface to be unclean. When the adhesive is used for bonding, the actual bonding surface of the adhesive in contact with the material is greatly reduced. In severe cases, it may not stick at all, so silicone bonding is used. Before glueing, it is necessary to check the cleanliness of the plastic surface or the storage process to ensure the cleanliness.

Material problem

Everyone should know that common plastics include PC, ABS, PVC, PP, PE, etc. If these plastics are involved in excessive waste in the production process, resulting in impure components, some components are analyzed, residual or seepage on the surface of the plastic, As a result, when using silicone to bond the sealant, the glue cannot contact the surface of the material. This is the possible reason why the same type of glue has good adhesion sometimes at the user’s place, and sometimes not at all. In fact, the comparison and verification method is relatively simple. Use alcohol to treat the surface, and then apply glue after the alcohol evaporates, and then you can know the effect.

Selection problem

Silicone adhesive sealants are classified into dealcoholization type, deoxime type, deacidification type, deacetone type, etc. by type. Each type of silicone adhesive sealant has different adhesion to different plastics. Therefore, when you choose to use silicone adhesive sealants, you must make accurate selections according to your own plastic materials. After choosing a good product, the precautions for use are very critical, such as the environment and the curing state, which will affect the adhesion.

CoolThermo Technology has been engaged in adhesive products for the electronic industry for more than ten years. It has rich experience in performance research, application solutions, industry positioning, etc. of silicone adhesive sealants. Share learning.

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