Method for modifying MC nylon engineering plastic by organic silicon

A technology of engineering plastics and silicone, applied in the field of silicone-modified MC nylon engineering plastics, can solve the problems of reducing the water absorption of MC nylon products, and the water plasticization deformation of MC nylon products.

Pending Publication Date: 2021-01-22
扬州倍尔特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for silicone modified MC nylon engineering plastics, which has the advantage of reducing the wat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The invention provides a method for organosilicon modified MC nylon engineering plastics, comprising the following steps:

[0018] S1. Weigh 100g of caprolactam monomer and add it into the reactor. After heating, melting, activation and vacuum dehydration at 130-140°C, add vinyl-terminated polydimethylsiloxane 20 synchronously with the anionic initiator toluene diisocyanate g, rapidly centrifugally dispersing and heating up to carry out caprolactam polymerization reaction to obtain organosilicon / MC nylon prefabricated products;

[0019] S2. Preparation of modified MC nylon with polyorganosilicon and MC nylon interpenetrating network structure realized by secondary polymerization method: at room temperature, the organosilicon / MC nylon preform is irradiated with gamma rays to complete the second polymerization, so that the preform The vinyl-terminated polydimethylsiloxane buried in MC nylon undergoes free radical polymerization to obtain a modified MC nylon with an interp...

Embodiment 2

[0022] The invention provides a method for organosilicon modified MC nylon engineering plastics, comprising the following steps:

[0023] S1. Weigh 100g of caprolactam monomer and add it into the reactor. After heating, melting, activation and vacuum dehydration at 130-140°C, add vinyl-terminated polydimethylsiloxane 10 synchronously with the anionic initiator toluene diisocyanate. g, rapidly centrifugally dispersing and heating up to carry out caprolactam polymerization reaction to obtain organosilicon / MC nylon prefabricated products;

[0024] S2. Preparation of modified MC nylon with polyorganosilicon and MC nylon interpenetrating network structure realized by secondary polymerization method: at room temperature, the organosilicon / MC nylon preform is irradiated with gamma rays to complete the second polymerization, so that the preform The vinyl-terminated polydimethylsiloxane buried in MC nylon undergoes free radical polymerization to obtain a modified MC nylon with an inter...

Embodiment 3

[0027] The invention provides a method for organosilicon modified MC nylon engineering plastics, comprising the following steps:

[0028] S1. Weigh 100g of caprolactam monomer and add it into the reactor. After heating, melting, activation and vacuum dehydration at 130-140°C, add vinyl-terminated polydimethylsiloxane 30 at the same time as the anionic initiator toluene diisocyanate g, quickly centrifugally disperse and heat up to carry out caprolactam polymerization reaction to obtain organosilicon / MC nylon prefabricated products;

[0029] S2. Preparation of modified MC nylon with polyorganosilicon and MC nylon interpenetrating network structure realized by secondary polymerization method: at room temperature, the organosilicon / MC nylon preform is irradiated with gamma rays to complete the second polymerization, so that the preform The vinyl-terminated polydimethylsiloxane buried in MC nylon undergoes free radical polymerization to obtain a modified MC nylon with an interpenet...

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Abstract

The invention discloses a method for modifying MC nylon engineering plastic by organic silicon, which comprises the following steps: S1, introducing vinyl-terminated organosilicon into a caprolactam anionic polymerization process: at 130-140 DEG C, activating and initiating a lactam monomer, carrying out vacuum dehydration, adding vinyl-terminated organic silicon into a reactor according to a massratio of caprolactam to vinyl-terminated organosilicon of 100: 10-30, uniformly dispersing the vinyl-terminated organic silicon, and finishing MC nylon polymerization reaction according to a caprolactam anionic polymerization process. The method is characterized by introducing vinyl-terminated siloxane into MC nylon by using the process of dispersing vinyl-terminated siloxane resin into the caprolactam anionic polymerization, and initiating vinyl-terminated free radical polymerization through secondary irradiation to form a polysiloxane and MC nylon interpenetrating network structure, therebypreparing the organic silicon modified MC nylon. The hydrophobicity of organic silicon is utilized to improve the water absorptivity of MC nylon, reduce the plasticizing effect of water on MC nylon,and enhance the stability of the service performance of MC nylon in a humid and hot environment.

Description

technical field [0001] The invention relates to the technical field of modification of engineering plastics, in particular to a method for modifying MC nylon engineering plastics with organic silicon. Background technique [0002] MC nylon 6 is a thermoplastic polymer obtained by polymerization of caprolactam monomers by anionic polymerization mechanism. Due to the polarity of the characteristic functional group amide structure in the molecular chain structure, the intermolecular force is strong, making MC nylon 6 high in crystallinity. Therefore, MC nylon 6 has high stiffness, high mechanical strength and good wear resistance. As an important engineering plastic, it is widely used in mechanical manufacturing, electrical engineering and other fields. However, MC nylon 6 has the problem that it is easy to absorb water and cause water plastic deformation of MC nylon products. It is necessary to modify the hydrophobicity of MC nylon to reduce its water absorption and improve t...

Claims

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Application Information

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IPC IPC(8): C08G69/42C08G77/455
CPCC08G69/42C08G77/455C08G2270/00
Inventor 张春红张爱臣张亮凌凌
Owner 扬州倍尔特新材料有限公司
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