Application of novel epoxy modified heat-resisting liquid silicon rubber

Abstract

The invention provides application of novel epoxy modified heat-resisting liquid silicon rubber. Specifically, the invention provides application of heat-resisting type liquid silicon rubber with improved strength and interface bonding performance to a preparation of a coating, a binding agent and a composite material. The epoxy modified heat-resisting liquid silicon rubber is prepared from the following raw materials in parts by weight: 100 parts of liquid silicon rubber, 10 parts of a bisphenol A type epoxy resin-silane coupling agent pre-polymer, 3 parts of a curing agent and 0.2 part of acatalyst A. To sum up, the strength and elongation at break of modified liquid silicon rubber are greatly improved (the tensile strength is improved to reach 0.83MPa and is improved by 162 percent when being compared with that of a pure sample, the bonding performance is 0.81MPa and is improved by 160 percent when being compared with that of the pure sample, and the elongation at break reaches 268percent and is improved by about 2 times when being compared with that of the pure sample); the rigidity and toughness of a material matrix are improved at the same time, and the interface bonding strength with filler and the matrix is remarkably increased when the liquid silicon rubber is used for a coating, a bonding agent and a composite material; the application field of the liquid silicon rubber is expanded and the service life of the liquid silicon rubber is prolonged. Meanwhile, the heat resisting performance still can keep a relatively high level, and the heat residual weight at 800 DEG C reaches 53.53 percent; a synthesis process has the advantages of simplicity, easiness for processing, short time and few steps and has a wide market application prospect.

Description

technical field [0001] The invention relates to the use of a novel epoxy-modified heat-resistant liquid silicone rubber, in particular to a heat-resistant liquid silicone rubber with improved molecular cohesion strength and interface bonding performance in the preparation of coatings, adhesives and composite materials use in . Background technique [0002] Silicone rubber is a linear type in which the main chain is composed of silicon-oxygen bonds (Si-O) alternately, and organic groups (such as methyl, ethyl, vinyl, phenyl, trifluoropropyl, etc.) form its side groups. polyorganosiloxane. Due to the particularity of structure and composition, silicone rubber materials combine the characteristics and functions of inorganic and organic substances, and have excellent properties that many other materials cannot have at the same time, such as excellent high and low temperature resistance, excellent oil resistance, solvent resistance, UV resistance, radiation resistance, good agi...

AI Technical Summary

Problems solved by technology

Modification of silicone rubber with other polymers can improve the above shortcomings. At present, there is no report on the use of bisphenol A epoxy resin for modifying liquid silicone rubber.

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