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Polysiloxane elastomer and preparation method and application thereof

A polysiloxane and elastomer technology, applied in the field of polysiloxane elastomer and its preparation, can solve the problems of low repair temperature, low cost, high reprocessing temperature, etc., and achieve improved mechanical strength, high yield, and synthetic The process is simple and easy to control the effect

Inactive Publication Date: 2018-05-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the poor mechanical properties of existing reversible covalently crosslinked polysiloxane elastomers containing hydrogen bonds or borate bonds, high reprocessing temperature, and Diels-Alder bond crosslinked polysiloxane elastomers The problem that the mechanical properties and self-healing properties cannot be improved at the same time provides a polysiloxane elastomer and its preparation method and application. The phenolic urethane bond is obtained by the reaction of phenol and isocyanate. It is a new type of heat-responsive elastomer. The dynamic bond can make the material self-repair at 90°C, and the benzene ring structure can also improve the mechanical strength of the material. The elastomer of the present invention has excellent mechanical properties, high transparency, good reprocessing performance, high self-repair efficiency, and relatively low repair temperature. Low, simple preparation process, relatively low cost

Method used

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  • Polysiloxane elastomer and preparation method and application thereof
  • Polysiloxane elastomer and preparation method and application thereof
  • Polysiloxane elastomer and preparation method and application thereof

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Embodiment

[0029] A polysiloxane elastomer:

[0030] Dissolving the following raw materials in parts by weight to obtain a reaction liquid: 2-12 parts of crosslinking agent, 18-31 parts of amino- or hydroxyl-terminated polydimethylsiloxane, 10-41 parts of diisocyanate, 5-35 parts 1 part of phenolic compound, 20 to 50 parts of solvent, add 1 drop of N,N-dimethylcyclohexylamine catalyst, stir and react at room temperature for 5 hours; then add 1 drop of dibutyltin dilaurate (DBTDL) catalyst, and continue the reaction at room temperature 5 hours; after the reaction, pour the prepolymer into a polytetrafluoroethylene mold, cure at room temperature for 10-96 hours, then put it in a 60°C oven to remove solvent, continue curing for 10-96 hours, and finally take it out of the mold to obtain Polysiloxane elastomer with phenolic dynamic urethane linkages.

[0031] Preferably, the amino- or hydroxyl-terminated polydimethylsiloxane is at least one of amino- or hydroxyl-terminated polydimethylsiloxa...

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Abstract

The invention relates to the technical field of new materials, in particular to a polysiloxane elastomer and a preparation method and application thereof. Amino or hydroxyl end capped polydimethylsiloxane, diisocyanate, phenol compounds and a cross-linking agent are dissolved into an organic solvent, a proper amount of catalyst is added, after the reaction is finished, a prepolymer is poured intoa polytetrafluoroethylene mold, heating and solidification are performed, and after the solvent is removed, the novel polysiloxane elastomer is obtained. The polysiloxane elastomer is good in mechanical strength, has the good thermoplasticity, can be reprocessed, has the self-repairing function, and is applied to the fields of flexible electronics, 3D printing, biomedicine and the like.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a polysiloxane elastomer and its preparation method and application. Background technique [0002] The main chain of polysiloxane is composed of silicon and oxygen atoms alternately, and the silicon atoms are directly connected with organic groups. It has the characteristics of both inorganic and organic polymers, such as high and low temperature resistance, weather aging resistance, electrical insulation, ozone resistance, Hydrophobic, good gas permeability, non-toxic, biologically inert, etc. It is widely used in electrical and electronic, construction, automobile, textile, medical and other fields. Polysiloxane molecular chains are flexible and have low intermolecular forces, so they are usually used in the form of cross-linked elastomers. Traditional polysiloxane elastomers face the same problems as all thermosetting materials: (1) the material is molded After damage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/61C08G18/32C08L75/04B33Y70/00
CPCC08G18/61B33Y70/00C08G18/3808C08L75/04
Inventor 夏和生孙劭杰王占华
Owner SICHUAN UNIV
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