The use of silicone pressure-sensitive adhesives is increasing, but there are many types of silicone pressure-sensitive adhesives, so which type of silicone pressure-sensitive adhesive is widely used? Let's introduce the relevant knowledge to everyone, and follow this article to find out.
At present, solvent-based silicone pressure-sensitive adhesives are still widely used. Typical solvents are toluene, xylene, xylene, petroleum ether and mixtures thereof. There have been many patent reports on solvent-based silicone pressure-sensitive adhesives. For example, the US patent introduces a high-temperature-resistant silicone pressure-sensitive adhesive. It uses aromatic diameter as a solvent, and uses MQ resin and hydroxyl or vinyl as end groups. It is expected to mix the fluoroflurane with rare earth <FONT face>
A pressure-sensitive adhesive is an adhesive that can adhere firmly to an adherend by simply applying finger pressure. It is widely used in the production of adhesive tapes, sub-sensitive labels, sanitary napkins and other similar products. Silicone pressure-sensitive adhesives not only have the good adhesive strength and initial tack necessary for pressure-sensitive adhesives, but also have excellent high-temperature shear strength, acceptable initial tackiness of probes, and room-temperature folding shear properties. Difficult-to-stick materials such as polytetrafluoroethylene have better adhesion properties. It also has a certain degree of liquid permeability and biological inertness, which can be used to treat the adhesion of drugs to human skin. Below we introduce to you which kind of silicone pressure-sensitive adhesive is widely used.
Generally, the main body of the silicone pressure-sensitive adhesive is made by mixing liquid silicone rubber and MQ silicone resin in a certain ratio. Silicone rubber can increase the fluidity of the pressure-sensitive adhesive, thereby increasing interfacial adhesion and strong initial tack. The MQ silicone resin has a greater impact on the adhesive properties of the pressure-sensitive adhesive, because the molecular weight of the MQ silicone resin changes the viscosity and cohesive strength of the pressure-sensitive adhesive. When the molecular weight of the MQ silicone resin is around 3000, the pressure-sensitive adhesive has the highest cohesive strength, good stickiness, high peel strength, and good thixotropy. For example, Shin-Etsu silicone pressure-sensitive adhesives are divided into peroxide-hardening type and additional reaction-hardening type:
Compared with domestic traditional pressure-sensitive adhesives, the excellent performance of silicone pressure-sensitive adhesives is profoundly manifested in chemical resistance, performance stability under extreme temperatures, and dielectric properties. In all pressure-sensitive adhesives, the critical temperature value at which the silicone pressure-sensitive adhesive exerts performance makes it perfect for use in any environment on the earth (high temperature threshold: 300 ° C, low temperature threshold: -75 ° C), in some Where the environmental requirement index is relatively high, the silicone pressure-sensitive adhesive has almost no pressure. In addition, it can also adhere to a variety of difficult-to-stick materials, such as non-surface-treated polyolefins, fluoroplastics, polyimide, and polycarbonate, which cannot be attached to ordinary pressure-sensitive adhesives. The experimental results are satisfactory.
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