Addition type silicone adhesive composition and preparation method thereof

Abstract

The invention discloses an addition type silicone adhesive composition and a preparation method thereof. The addition type silicone adhesive composition comprises (A) 60 to 100 mass parts of organopolysiloxane, (B)1 to 10 mass parts of substance obtained by reacting Si-H groups in the organopolysiloxane with hydroxyls in hydroxy ethyl acrylate or hydroxy propyl methacrylate; (C) 1 to 50 mass parts of gaseous-phase silica, (D) 0.001 to 0.01 weight parts of alkyne inhibitor, and (E) 0.1 to 2 mass parts of platinum catalyst, wherein the content of platinum atoms is 5-2,000ppm; and the preparation method of the addition type silicone adhesive composition comprises the following steps: uniformly mixing the (A), (C) and (D) in vacuum, then sequentially adding (B) and (E) to carry out vacuum defoamation, and solidifying the obtained mixture for 5 to 60 minutes at the temperature of between 80 and 210 DEG C.

Description

technical field [0001] The invention relates to an adhesive and a preparation method, in particular to an addition type silicone rubber adhesive composition and a preparation method. Background technique [0002] At present, addition-type silicone rubber mainly contains at least 2 vinyl organopolysiloxanes, hydrogen-containing silicone oil, platinum catalyst and inhibitor, and reinforcing fillers can be added to improve strength, such as fumed silica and precipitated silica , calcium carbonate, diatomaceous earth, silica powder and mica powder, etc. When the addition-type silicone rubber adhesive is used for coating and sealing, it needs to have good adhesion to the substrate. Usually, it is necessary to pre-coat the primer on the surface of the adhered substrate or add a silane coupling agent to the addition-type silicone rubber. In contrast, it is more convenient to add a silane coupling agent. Generally, the silane coupling agent for addition-type silicone rubber is most...

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Problems solved by technology

When the addition-type silicone rubber adhesive is used for coating and sealing, it needs to have good adhesion to the substrate. Usually, it is necessary to pre-coat the primer on the surface of the adhered substrate or add a silane coupling agent to the addition-type silicone rubber. In contrast, it is more convenient to add a silane coupling agent. Generally, the silane coupling agent for addition-type silicone rubber is mostly organosiloxane containing alkoxy (such as methoxy, ethoxy) and epoxy groups. During the vulcanization process, the bonding is achieved through the coupling formed between the added silane coupling agent and the substrate, but too little silane coupling agent can not achieve a good bonding effect, and too much addition will affect the vulcanization. Physical and mechanical properties and electrical properties, and the boiling point of most silane coupling agents is in the range of 100-200 ° C, and the heating and curing temperature of addition-type silicone rubber is also within this range. Therefore, during the heating and curing process of addition-type silicone rubber, The added silane coupling agent will volatilize in a certain amount, which not only affects the bonding effect, but also the volatilized silane coupling agent is harmful

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