Modified POM copolymer resin and preparation process thereof

A technology of copolymer resin and preparation process, which is applied in the field of modified POM copolymer resin and its preparation technology, can solve the problems of poor thermal stability of polyoxymethylene, instability of hemiacetal end groups, and accelerated decomposition of polyoxymethylene, so as to improve Impact strength and flexibility, stable mechanical properties, and the effect of improving crystallinity

Inactive Publication Date: 2021-08-13
广州搜料信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The hemiacetal end group at the end of the polyoxymethylene molecular chain is unstable, and it is easily oxidized into peroxide free radicals under the condition of light or oxygen, which makes the molecular chain break, so the thermal stability of polyoxymethylene is not good, especially in strong Under the conditions of light, heat and strong acid, the decomposition of polyoxymethylene will be accelerated, the mechanical properties will decrease, the surface will be pulverized and cracked, and finally it will become formaldehyde gas

Method used

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  • Modified POM copolymer resin and preparation process thereof
  • Modified POM copolymer resin and preparation process thereof
  • Modified POM copolymer resin and preparation process thereof

Examples

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Effect test

Embodiment 1

[0027] A kind of modified POM copolymer resin and preparation technology thereof:

[0028] 1) Melt and mix 25% polyoxymethylene homo, 45% polyoxymethylene copolymer, 3% composite nucleating agent, and 8% styrene-butadiene rubber particles at a temperature of 165°C, and add KH550 coupling agent (10% of the rubber particles) , stir evenly;

[0029] The composite nucleating agent is synthesized by nano-silica, melamine formal, and polyamide in a ratio of 1:1:1;

[0030] 2) Add 12% fiber filler (carbon fiber, aramid staple fiber and glass fiber 2:1:1) and 7% stabilizer zinc oxide to the molten mixture, the screw speed is 100 rpm, and the barrel temperature is 190°C Melt kneading and granulation under the conditions.

Embodiment 2

[0032] A kind of modified POM copolymer resin and its preparation process

[0033] 1) Melt and mix 28% homopolyoxymethylene, 50% polyoxymethylene, 2% composite nucleating agent, and 5% butyl rubber particles at a temperature of 170°C, and add KH560 coupling agent (10% of the rubber particles) , stir evenly;

[0034] Described composite nucleating agent is that nano-calcium carbonate, polyamide and carbon nanotube are synthesized with 1:1:2 ratio;

[0035] 2) Add 10% fiber filler (carbon fiber, aramid short fiber and glass fiber 2:1:1) and 5% stabilizer zinc oxide to the molten mixture, the screw speed is 200 rpm, and the barrel temperature is 195°C Melt kneading and granulation under the conditions.

Embodiment 3

[0037] A kind of modified POM copolymer resin and its preparation process

[0038] 1) Melt and mix 30% polyoxymethylene homo, 36% polyoxymethylene copolymer, 3% composite nucleating agent, and 10% butadiene rubber particles at a temperature of 175°C, and add KH570 coupling agent (10% of the rubber particles) , stir evenly;

[0039] Described composite nucleating agent is that nano-calcium carbonate, melamine formal, carbon nanotube are synthesized with 1:1:2 ratio;

[0040] 2) Add 11% fiber filler (carbon fiber, aramid short fiber and glass fiber 3:1:1) and 10% stabilizer zinc oxide to the molten mixture, the screw speed is 200 rpm, and the barrel temperature is 200°C Melt kneading and granulation under the conditions.

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Abstract

The invention belongs to the technical field of resin modification, and particularly relates to modified POM copolymer resin and a preparation process thereof. The POM copolymer resin is prepared from homopolyformaldehyde, copolyformaldehyde, a composite nucleating agent, rubber particles, a fiber filler and a stabilizer. The composite nucleating agent comprises a mixture of an inorganic nucleating agent and an organic nucleating agent, the inorganic nucleating agent comprises one or more of nano silicon dioxide, nano calcium carbonate and boron nitride, and the organic nucleating agent comprises one of melamine formal, polyamide and a carbon nanotube. The resin is reinforced and modified through a re-checking nucleating agent, rubber particles and a fiber filler, the crystallinity of the resin is improved, the toughness of the resin is improved, the impact strength, flexibility, rigidity and creep resistance of the resin material are remarkably improved, the wear resistance and heat resistance of the resin material are improved, and the used material has the characteristic of low VOC; and the modified POM copolymer resin disclosed by the invention is applied to the field of automobiles and can meet the ultralow emission performance required by the automobile market.

Description

technical field [0001] The invention belongs to the technical field of resin modification, and in particular relates to a modified POM copolymer resin and a preparation process thereof. Background technique [0002] Polyoxymethylene resin (Polyoxymethylene, POM) is a linear polymer with no side chains, high density, and high crystallinity. According to the different chemical structures in its molecular chain, it can be divided into homopolyoxymethylene and copolymerized polyoxymethylene. The important differences between the two are: the density, crystallinity and melting point of polyformaldehyde are high, but the thermal stability is poor, the processing temperature range is narrow (about 10 ℃), and the stability to acid and alkali is slightly lower; while the density, crystallinity and melting point of polyformaldehyde copolymer The melting point and strength are low, but the heat stability is good, it is not easy to decompose, the processing temperature range is wide (ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L77/10C08L61/28C08L77/00C08L9/06C08L23/22C08L9/00C08K7/14C08K7/06C08K3/22C08K3/36C08K3/26C08K3/38C08K3/04
CPCC08L59/00C08K2003/2296C08K2201/011C08K2003/265C08K2003/385C08L2201/08C08L2205/24
Inventor 谢玉辉童大山
Owner 广州搜料信息技术有限公司
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