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A kind of silicone rubber crosslinking agent and its preparation method and application

A technology of silicone rubber and cross-linking agent, applied in the field of silicone rubber cross-linking agent and its preparation, can solve the problems of poor repeatability and poor mechanical properties, and achieve the effect of wide application range

Active Publication Date: 2020-05-22
杭州聚丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of poor repeatability and poor mechanical properties of thermoplastic silicone rubber in the prior art, the invention provides a silicone rubber crosslinking agent to replace the traditional silicone rubber crosslinking agent, so that the silicone rubber can be transformed into a high-strength, reproducible Thermoplastic silicone rubber for repeated processing

Method used

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  • A kind of silicone rubber crosslinking agent and its preparation method and application
  • A kind of silicone rubber crosslinking agent and its preparation method and application
  • A kind of silicone rubber crosslinking agent and its preparation method and application

Examples

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Effect test

Embodiment 1

[0047] (1) Nitroxide free radical piperidinol and benzoyl peroxide are dissolved in styrene, and the molar ratio of nitroxide free radical piperidinol to benzoyl peroxide and styrene is 1:0.2:1, and the After bubbling argon for 30 minutes, react at 90°C for 5 hours under the protection of argon, and cool to room temperature; after removing unreacted styrene under reduced pressure, add a potassium hydroxide solution equimolar to nitroxide free radical piperidinol and continue at room temperature. Reaction 12h;

[0048] Add dichloromethane and deionized water to the reaction mixture to separate the product, collect the organic phase, and extract the water phase with dichloromethane 3 times; add anhydrous sodium sulfate to the organic phase to dry and remove water for 24 hours, then filter to remove the anhydrous Sodium sulfate, dichloromethane was removed under reduced pressure to obtain a crude product; the crude product was separated and purified by column chromatography, and ...

Embodiment 2

[0051] (1) Nitroxide free radical piperidinol and benzoyl peroxide are dissolved in styrene, and the molar ratio of nitroxide free radical piperidinol to benzoyl peroxide and styrene is 1:0.2:1, and the After bubbling argon for 30 minutes, react at 90°C for 5 hours under the protection of argon, and cool to room temperature; after removing unreacted styrene under reduced pressure, add a potassium hydroxide solution equimolar to nitroxide free radical piperidinol and continue at room temperature. Reaction 12h;

[0052] Add dichloromethane and deionized water to the reaction mixture to separate the product, collect the organic phase, and extract the water phase with dichloromethane 3 times; add anhydrous sodium sulfate to the organic phase to dry and remove water for 24 hours, then filter to remove the anhydrous Sodium sulfate, dichloromethane was removed under reduced pressure to obtain a crude product; the crude product was separated and purified by column chromatography, and ...

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Abstract

The invention relates to the field of polymer processing, and discloses a silicone rubber cross-linking agent, which has a structural formula shown in the specification. A preparation method of the silicone rubber cross-linking agent comprises the following steps: perfomring nitroxide free radical piperidinol with styrene under the action of an initiator to prepare alkoxy amine diol; and adding acatalyst, an acid-binding agent and a reaction medium into the alkoxy amine glycol, and dropwise adding chlorosilane for a reaction to obtain the cross-linking agent. The silicone rubber cross-linkingagent contains silicon-hydrogen bonds and can replace traditional silicone rubber cross-linking agents such as peroxide or hydrogen-containing silicone oil; and the cross-linking agent contains C-ONdynamic bonds, which can be dissociated at high temperature and are recombined at room temperature; therefore, thermoplastic silicone rubber cross-linked network structure prepared by the method is gradually decrosslinked into an original linear chain at high temperature, and the cross-linked network structure is formed again at room temperature, so that the repeated processability of the siliconerubber is achieved, the mechanical property is excellent, and the mechanical property can be kept basically unchanged after repeated processing for many times.

Description

technical field [0001] The invention relates to the field of polymer processing, in particular to a silicone rubber crosslinking agent and its preparation method and application. Background technique [0002] Silicone rubber refers to the rubber whose main chain is composed of silicon and oxygen atoms alternately, and two organic groups are connected to the silicon atoms. Silicone rubber has outstanding high temperature resistance, weather resistance, radiation resistance and good elasticity. It can maintain stable mechanical properties between -40-200 ° C, and maintain a certain degree of toughness, resilience and hardness. It is widely used in various field. The excellent performance of silicone rubber mainly comes from the three-dimensional covalent cross-linked network structure formed by silicon-oxygen bonds. However, the highly irreversible cross-linked network structure also makes it unable to be re-molded, and can only be used as a thermosetting material, which lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/544C08L83/04C07F7/18
CPCC07F7/188C08K5/5477C08L83/04
Inventor 张才亮吴坤红王笛洪东海
Owner 杭州聚丰新材料有限公司