Adhesive mono-component addition silicone rubber adhesive and preparation method thereof

Abstract

The invention discloses an adhesive mono-component addition silicone rubber adhesive. The adhesive mono-component addition silicone rubber adhesive is prepared from the following components in parts by weight: 100 parts of vinyl polydimethyl siloxane, 1-15 parts of hydrogen-containing polysiloxane, 5-30 parts of vapor-phase method silicon dioxide, 0.1-5 parts of platinum catalysts, 0.05-2 parts of inhibiting agents and 1-10 parts of adhesion promoters. Compared with mono-component addition silicone rubber prepared by methyl acryloyloxy alkoxy silane or acryloyloxy alkoxy silane monomer serving as an adhesive promoter, the mono-component addition silicone rubber prepared by homopolymer of methyl acryloyloxy alkoxy silane or acryloyloxy alkoxy silane monomer serving as the adhesive promoter has a good adhesion effect on aluminum alloy base materials.

Description

technical field [0001] The invention relates to a silicone rubber adhesive and a preparation method thereof, in particular to a one-component addition type silicone rubber adhesive with good adhesive performance and a preparation method thereof. Background technique [0002] Addition-type silicone rubber is a type of silicone product that has developed rapidly in recent years, has high product technology content, excellent performance and high added value. Compared with condensation-type RTV silicone rubber with relatively mature technology, addition-type silicone rubber No low-molecular by-products are produced during the vulcanization process, so the addition-type RTV silicone rubber does not shrink during the vulcanization process, and has excellent aging resistance and electrical insulation after curing, and is non-toxic, high in mechanical strength, and has excellent resistance Hydrolytic stability, good low compression set, low flammability, deep vulcanization, and vul...

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Problems solved by technology

[0003] The disadvantage of addition-type silicone rubber in the application is that it has poor adhesion to most substrates. This is mainly because the addition-type silicone rubber is a highly saturated non-polar rubber after vulcanization, which is outside the silicone main chain. The arrangement is a layer of non-polar organic groups, and the molecular surface energy is low, which leads to poor adhesion when used as potting, coating, and insert injection molding materials, which limits its use to a certain extent

At present, there are two main methods to improve the adhesion between silicone rubber and various materials: one is to use a primer to treat the surface of the substrate, which increases the production process and production time, reduces production efficiency, and simultaneously Most of the paints use flammable solvents, which cause transportation hazards and environmental pollution; the second is to improve the adhesion by adding adhesion promoters. This method is convenient and easy to operate. Commonly used addition-type silicone rubber adhesion promoters include ethylene But as Due to the diversity of contact substrates in the application process and the continuous improvement of the requirements for adhesion, the commonly used tackifiers can no longer meet the requirements for adhesion in the actual application process. Therefore, the research on addition-type silicone rubber adhesion promoters It has become a research hotspot in recent years. Chinese patent CN102775611A discloses a reaction product of hydroxyl silicone oil, epoxy group-containing silane coupling agent KH560 and methacryloxy group-containing silane coupling agent KH570. Tackifier, but an organotin catalyst is used in the preparation process of the tackifier, and the introduction of an organotin catalyst will affect the activity of the platinum catalyst to a certain extent; patent CN103146203A discloses a one-component addition type silicone rubber and its The preparation method uses commonly used vinyltrimethoxysilane or vinyltriethoxysilane, allyltrimethoxysilane or allyltriethoxysilane as a tackifier, although it has a certain bonding effect , but has certain limitations. At the same time, the introduction of vinyl and allyl groups will have a certain impact on curing. CN102408869A patent discloses a hydrolyzate of vinyl silane coupling agent and epoxy silane coupling agent as an adhesive Accelerator, although the adhesion to aluminum materials has been improved, but the structure of its hydrolyzed product is not easy to control, and the vinyl group content in the hydrolyzed product also has the disadvantage of affecting the addition curing reaction. CN102492391A patent discloses an adhesive Adhesion promoter, the adhesion promoter is prepared by the reaction of 1,3,5,7-tetramethylcyclotetrasiloxane and allyl glycidyl ether under the action of platinum catalyst, and the adhesion promoter can be used to obtain strong Adhesive addition type silicone rubber material, but the presence of platinum catalyst in the adhesion promoter makes its stability poor

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