Heat-resisting liquid silicon rubber with improved strength and interface bonding performance

A liquid silicone rubber and interface bonding technology, which is applied in the field of heat-resistant liquid silicone rubber materials to achieve the effects of easy processing, broad market application prospects and high heat resistance.

Pending Publication Date: 2018-12-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modification of silicone rubber with other polymers can improve the above shortcomings. At presen

Method used

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  • Heat-resisting liquid silicon rubber with improved strength and interface bonding performance
  • Heat-resisting liquid silicon rubber with improved strength and interface bonding performance
  • Heat-resisting liquid silicon rubber with improved strength and interface bonding performance

Examples

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Example Embodiment

[0025] Example 1. Preparation of epoxy resin modified liquid silicone rubber of the present invention

[0026] 1. Preparation method of epoxy resin modified liquid silicone rubber of the present invention

[0027] 1 Experimental materials

[0028]

[0029] 2 Preparation of bisphenol A epoxy resin-silane coupling agent prepolymer

[0030]

[0031] Into a three-necked flask equipped with a thermometer, a mechanical stirrer, and a reflux condenser device, an epoxy resin (E44, 50g) and a silane coupling agent (SCA-L, 13.04g) with a molar ratio of 1:1 were sequentially added to inert. The air in the gas exhaust device is heated up to 100°C and kept constant, and the stirring is started to make the mixture uniformly mixed. By changing the prepolymerization reaction time and the amount of catalyst (tetraisopropyl titanate) (see Table 1), 9 groups of different initial products were prepared, and the initial products were taken out, and the unreacted silane couples were washed away with metha...

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Abstract

The invention provides heat-resisting liquid silicon rubber with improved strength and interface bonding performance and in particular relates to a heat-resisting type liquid silicon rubber material with strength and interface bonding performance, which can be improved through introducing an epoxy functional group. The 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 a catalyst A. Starting from a molecular structure design, the epoxy functional group is introduced into a silicon rubber material matrix, so that the strength of the silicon rubber (the tensile strength is improved to reach 0.83MPa and is improved by 162 percent when being compared with that of a pure sample, and the bonding performance is 0.81MPa and is improved by 160 percent when being compared with that of the pure sample) , and elongation at break (the elongation at break reaches 268 percent and is improved by about two times when being compared with that of the pure sample) are greatly improved under the condition that the adding amount is extremely low; the rigidity and toughness of a composite material are improved at the same time, an application field of the silicon rubber is extremely widened and the service life of the silicon rubber is prolonged.

Description

technical field [0001] The invention relates to a modified heat-resistant liquid silicone rubber, in particular to a heat-resistant liquid silicone rubber material with epoxy-improved strength and interface bonding performance. 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 aging resistance, excellent electrical insulation and chemical stability and physiological inertness, etc...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L63/00C08L83/05
CPCC08L83/04C08L2201/08C08L2205/025C08L2205/03C08L63/00
Inventor 邹华维张斌陈洋梁梅
Owner SICHUAN UNIV
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