In recent years, the development of chemical industry in China is relatively fast. Silicone pressure-sensitive adhesive is a common chemical raw material, a pressure-sensitive adhesive with organic silicon polymer as the main body. Compared with the traditional acrylate pressure-sensitive adhesive and rubber pressure-sensitive adhesive, silicone pressure-sensitive adhesive has many advantages. Let's learn more about the advantages of silicone pressure-sensitive adhesive.
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Silicone pressure sensitive tape
Generally, the main body of silicone pressure-sensitive adhesive is composed of liquid silicone rubber and MQ silicone resin in a certain proportion. Silicone rubber can increase the fluidity of pressure-sensitive adhesive, thus increasing the interface adhesion and the initial adhesion. MQ silicone has a great influence on the adhesion performance of pressure-sensitive adhesive, because the change of molecular weight of MQ silicone changes the viscosity and cohesive strength of pressure-sensitive adhesive. When the molecular weight of MQ silicone is about 3000, the pressure-sensitive adhesive has the highest cohesive strength, good adhesion, high peel strength and good thixotropy. For example, Xinyue silicone pressure-sensitive adhesive is divided into peroxide hardening type and additional reaction hardening type:
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Silicone pressure sensitive adhesive compared with traditional pressure sensitive adhesive
Compared with the traditional pressure-sensitive adhesive in China, the excellent properties of silicone pressure-sensitive adhesive are deeply reflected in the chemical resistance, the performance stability and dielectric properties under extreme temperature. Among all the pressure-sensitive adhesives, the critical temperature value of the performance of silicone pressure-sensitive adhesive almost enables it to be perfectly used in any environment on the earth (high temperature critical value: 300 ℃, low temperature critical value: - 75 ℃). In some places where the environmental requirement index is relatively high, the silicone pressure-sensitive adhesive has almost no pressure. In addition, it can also be used to bond a variety of difficult to stick materials, such as the base surface of common pressure-sensitive adhesives such as polyolefin, fluoroplastics, polyimide and polycarbonate without surface treatment. The experimental results of silicone pressure-sensitive adhesives are satisfactory.
Cut the pressure-sensitive adhesive into 1 inch strips, and stick it on the standard steel plate. When it is placed at 120 ℃ for 48 hours, the transfer of silicone pressure-sensitive adhesive in the steel plate is obviously less.
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Application field of silicone pressure sensitive adhesive
Industrial applications
Silicone pressure-sensitive adhesive has good resistance to high and low temperature, chemical resistance and low dielectric properties, and can be used to bond to low surface energy surfaces. This makes the silicone pressure-sensitive adhesive tape widely used in industrial production in the form of splicing tape, electrical tape, plasma spraying tape, machining tape and so on.
Adhesive tape for Teflon surface bonding
Electrical applications
Silicone pressure-sensitive adhesive and its adhesive tape are generally used in the production and assembly process of printed circuit board (PCB). This requires that PSA not only can withstand high temperature (270 ℃ for a short time), but also has low dielectric properties. Silicone pressure-sensitive adhesive is also widely used in the protective coating of electronic components. These protective coatings are composed of multi-layer structures, each of which gives unique performance to the protective coating.
Silicone pressure-sensitive adhesive tape for PCB
Intelligent device application
Because many smart phones are expensive, it becomes more and more important to protect their high-quality screens from scratches and bumps in use. When the mobile phone leaves the factory, the manufacturer usually pastes a film on the screen surface to prevent the screen damage caused by scratch and bump that may occur during the transportation or sale of the mobile phone. Most consumers will tear off this simple protective film and stick a layer of self-adhesive protective film (e.g. toughened film) after they get the new mobile phone, so as to prevent the huge impact when the mobile phone is dropped by accident or the fatal damage to the screen when the hot cigarette butts are accidentally touched. Silicone pressure-sensitive adhesive is widely used in this thin and tough protective film.
Toughened protective film structure of smart phone
The protective film is usually a multi-layer "sandwich" structure, and the specific characteristics of each layer of adhesive depend on its structure and chemical composition. Among them, pressure-sensitive adhesive layer plays a key role.
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Other applications
In recent years, medical silicone pressure-sensitive adhesive has developed rapidly. Because of its non-toxic, non irritating, physiological inert, wide range of use temperature, suitable adhesive strength and drug permeability, it has been widely used in medical treatment and percutaneous treatment system preparations.
Silicone pressure-sensitive adhesive can be used as surface protective tape for automobile, aircraft, mechanical parts, building reinforcement board, household appliances, wood products, glass products, plastic products, etc. It can also be used for the connection of transformer coil and electrical equipment.
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