Modified polyformaldehyde resin and its preparation method

A polyoxymethylene resin and modification technology, applied in the field of new polymer materials, can solve the problems of restricting the production and application of new polyoxymethylene copolymers, restricting the application field of reinforced polyoxymethylene, reducing the stability of polyoxymethylene, etc., to achieve improved thermal stability, high Strength, the effect of increasing strength and rigidity

Active Publication Date: 2007-04-18
重庆云天化天聚新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As one of the five general-purpose engineering plastics, polyoxymethylene, the tensile strength of unmodified polyoxymethylene is generally 60MPa, the tensile modulus of elasticity is 2600MPa, the tensile strength of polyoxymethylene is generally 66MPa, and the tensile modulus of elasticity is 2800Mpa ; Although polyoxymethylene is an engineering plastic with excellent comprehensive performance, as an engineering material, its strength and rigidity can not fully meet the requirements of all walks of life. In order to further improve the strength and rigidity of polyoxymethylene, generally in the prior art by adding a large amount of inorganic Reinforcement materials are used to improve the strength and rigidity of polyoxymethylene. Commonly used reinforcement materials include inorganic fillers, glass fibers, glass beads, and carbon fibers. Commonly used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 100 parts by weight of polyoxymethylene resin (melt index is 9-10g / 10min) and 0.3 parts by weight of pentaerythritol tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 0.05 parts by weight Parts of melamine, 0.05 parts by weight of calcium carbonate, and 0.05 parts by weight of boron nitride are added to the mixer and mixed evenly, using a vented twin-screw extruder at a screw speed of 120 rpm and a barrel temperature of 170-220°C After melting, kneading and granulation under certain conditions, a standard test bar was made by an injection molding machine and its performance was measured. The measured results are shown in Table 1.

Embodiment 2

[0040] Except that boron nitride is changed from 0.05 parts by weight to 0.5 parts by weight, calcium carbonate is changed from 0.05 parts by weight to 0.15 parts by weight, melamine is changed from 0.05 parts by weight to 0.01 parts by weight, pentaerythritol tetrakis [3-(3,5-ditertiary Butyl-4-hydroxyphenyl) propionate] is changed into 1.5 weight part by 0.3 weight part, screw speed is changed into 160 rev / mins, and barrel temperature is changed into 190-250 ℃ except that other conditions are all the same as embodiment 1. The measured results are shown in Table 1.

Embodiment 3

[0042] Except that boron nitride is changed from 0.05 parts by weight to 1.5 parts by weight, the screw speed is changed to 250 rpm, and the barrel temperature is changed to 190-250°C, other conditions are the same as in Example 1, and the measured results are shown in Table 1. shown.

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Abstract

This invention relates to a polyformaldehyde resin with high heat stability, high intensity, high modulus and its preparations. The feature of this invention is mixing formaldehyde resin, free radical catcher, formaldehyde catcher, formic acid catcher and inorganic compound with lamerllar crystal structure together, and then melting, compounding and palletizing by Screw Extruder. This polyfomaldehyde resin can be used in the fields of high demanding of intensity and rigidity, such as auto making, electricity and electronic machine, office equipment, industrial machine and so on.

Description

technical field [0001] The invention relates to a thermoplastic engineering plastic and its preparation, in particular to a modified polyoxymethylene resin and its preparation method, belonging to the technical field of new polymer materials. Background technique [0002] POM is a thermoplastic engineering plastic with high melting point, high density and high crystallinity. According to different molecular structures, POM can be divided into copolymers and homopolymers. Homopolymer has higher rigidity and strength than copolymer POM, but The thermal stability is worse than that of polyoxymethylene; polyoxymethylene resin (including homopolyoxymethylene and polyoxymethylene) has better comprehensive physical properties. Compared with other polymer materials, it has high physical strength, fatigue resistance, creep resistance, and Solvent resistance and good wear resistance and self-lubricating properties, as a kind of thermoplastic engineering plastics with excellent compreh...

Claims

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Application Information

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IPC IPC(8): C08L59/02C08K7/00C08K5/17C08K3/22C08K5/09C08K3/26C08K3/36C08J3/12
Inventor 王志春普雪涛兰林胡志英刘和兴陈林
Owner 重庆云天化天聚新材料有限公司
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