Bonding adhesive for bonding fluorocarbon silicone rubber with metals and preparation method thereof

Abstract

A bonding adhesive for bonding fluorocarbon silicone rubber with metals and a preparation method thereof are characterized in that: the bonding adhesive comprises the following components: A. a fluorocarbon silicone rubber compound, B. a silane coupling agent containing peroxide groups, C. a silane coupling agent containing olefin functional groups, D. a ketone solvent, and E. an ester solvent. The bonding adhesive has stable and reliable property and can be used for bonding fluorocarbon silicone rubber with common metals such as copper, steel, aluminum and the like; the obtained adhesive strength is stable; and the bonded part has excellent properties of heat-resistance, oil-resistance, medium-resistance and the like, which are equivalent to those of the fluorocarbon silicone rubber.

Description

technical field [0001] The invention relates to the rubber product industry and the adhesive industry in the field of chemical industry, in particular to an adhesive used for bonding heat vulcanized fluorosilicone rubber to metal materials during the vulcanization process and a preparation method thereof. Background technique [0002] Fluorosilicone rubber is a type of elastomer with siloxane (SI—O—Si) as the main chain and fluoroalkyl or fluoroaryl groups introduced into the side chains. Due to the introduction of the latter, this rubber is not only It has many excellent properties unique to silicone rubber, such as: superior high and low temperature resistance, good flexibility, and it also has outstanding oil resistance and various chemical resistance like fluororubber. It is particularly worth mentioning that this rubber material has excellent stability for various petroleum-based fuels, lubricating oils, hydraulic oils and some synthetic oils, no matter at normal temper...

AI Technical Summary

Problems solved by technology

However, the fluorosilicone rubber with polysiloxane as the main chain is essentially a kind of surface inert elastomer with low surface free energy that is not easy to bond, and there are fluorine-containing groups on its side chain (mainly The introduction of trifluoropropyl) will have a shielding effect on the methyl and silicon-oxygen bonds, further increasing the difficulty of fluorosilicone rubber bonding

In the prior art, for the bonding of fluorosilicone rubber and metal materials, an appropriate silane coupling agent is generally selected as a surface treatment agent to improve the bonding effect, such as described in US Patent No. 4,537,815. However, using silane coupling agent There is a fatal shortcoming in the method of using the coupling agent as a surface treatment agent, that is, the instability of the silane coupling agent, which is easily hydrolyzed, so the environment of the surface treatment has a great influence on the bonding effect, and it must be used in a low-humidity environment. It must be treated in the environment, and the bonding operation must be carried out immediately after the treatment, otherwise it will lead to fluctuations in the bonding quality. In addition, the prepared treatment agent must be kept in a strict seal. Use this method in a production environment

At present, there are also some adhesives on the market that can be used for the bonding of fluorosilicone rubber and metal, such as Chemlok 608, etc., but the bonding effect is not ideal, and the performance is not stable, especially in heat resistance, oil resistance or medium resistance. Some performance aspects of fluorosilicone rubber characteristics cannot reach the same level as fluorosilicone rubber itself, which limits the applicable surface of the products made.

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