What is the best glue for painting organic board-Iota

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Service > What is the best glue for painting organic board

What is the best glue for painting organic board

Silicone resins are highly crosslinked polyorganosiloxane of the network structure, usually with methyl trichlorosilane, dimethyl dichlorosilane, phenyl trichlorosilane, diphenyl dichlorosilane, or methyl phenyl various mixtures of dichlorosilane in the presence of an organic solvent such as toluene, at a lower temperature hydrolysis to give the acid hydrolyzate. The initial hydrolysis product is cyclic, linear, and a mixture of cross-linked polymers, usually contain a considerable amount of hydroxyl groups. Hydrolysis was washed with water to remove the acid, neutral in the beginning of the polycondensation, or by thermal oxidation in air in the presence of a polycondensation catalyst further, and finally the formation of three-dimensional network structure highly crosslinked.
Cured silicone resins are generally formed by condensation of silanol siloxane chain link to achieve. When the condensation reaction is conducted, since the silicon concentration of alcohol is gradually decreased, increasing the steric hindrance, poor flowability, resulting in the reaction rate decreases. Therefore, to make the resin is completely cured, subject to heating and adding a catalyst to accelerate the reaction. Many substances can play a silanol condensation reaction catalyst, which include salts of organic acids and alkali-soluble, lead, cobalt, tin, iron and other metals, organic compounds such as dibutyltin dilaurate, or N, N, N ', N' fourteen tetramethylguanidine salt.
The final properties of the silicone resin processed article depends on the amount (i.e., the ratio of R and Si) contained in the organic group. Usually practical value silicone resin composition of the molecule, R is the ratio of Si is between 1.2 ~ 1.6. As a general rule, R: the smaller the value of Si, the more the obtained silicone resin can be cured at lower temperatures; R: The larger the value of Si, the resulting silicone resin cured on the need to make it 250 200 Material baked at a high temperature ℃ for a long time, and the resulting film hardness is poor, but much better than the former thermoelasticity.
In addition, the ratio of methyl and phenyl groups also have a great impact on the performance of silicone organic groups. The lower organic groups phenyl content, the softer the resulting film, the faster the condensation, the higher the content of a phenyl group, the harder the resulting paint, the more thermoplastic. Phenyl content between 20 to 60%, the film has a bending resistance and heat resistance is best. Furthermore, the introduction of a phenyl silicone resin and the pigment can be improved compatibility, the silicone resin can be improved with another silicone resin and silicone resin, the compatibility of adhesion to various substrates.
Silicone resin is a thermosetting plastic, which is one of the most outstanding properties of excellent thermal oxidation stability. 250 ℃ was heated for 24 hours, the silicone resin, the weight loss is only 2-8%. Another outstanding properties of the silicone resin is excellent in electrical insulation properties, it can maintain its good insulation properties over a wide temperature and frequency range. General Electric Silicone breakdown strength of 50 kV / mm, volume resistivity of 1013 - 1015 ohm? Cm and a dielectric constant of 3, the dielectric loss tangent value of about 10-30. In addition, the silicone resin also has excellent resistance to moisture, water, rust, cold, ozone and weather resistance, the vast majority of chemical reagents such as dilute aqueous mineral acid corrosion resistance is good, but the performance is poor solvent.
In view of the above features, the silicone resin is mainly used as insulating paint (including varnishes, enamels, paints, varnish, etc.) impregnated with H class motor and transformer coils, and for impregnating glass cloth, glass cloth made of stone Busi and motor cover pipes, electrical insulation windings and the like. Silicone insulating paint adhesion can be obtained by a large area of mica mica insulation material, is used as the main insulated high-voltage motors. In addition, the silicone is also used as a heat-resistant, weather-corrosion coatings, metallic protective coatings, construction waterproof coatings, mold release agents, adhesives and silicone secondary processed into plastic, used in electronic, electrical and defense industry , as a semiconductor package materials and electronic and electrical components of the insulation materials.
Crosslinked silicone resin curing roughly three ways: First, the use of silicon atoms on the hydroxyl groups were shrinking crosslinked polymeric network structure, which is the main way of curing silicone taken, and second, the use of silicon atoms ethylene connected group, using an organic peroxide as the catalyst, similar to a silicone rubber vulcanized by: Thirdly, the use of vinyl and silicon on the silicon atom of hydrogen addition reaction method, for example, solvent-free silicone resin is mixed with the blowing agent can be prepared a foam silicone. Therefore, its main purpose silicone and crosslinking methods can be divided into silicone varnish, silicone coatings, silicone plastic and silicone adhesives and other categories

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