Modified polyformaldehyde resin and its preparation method

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...

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 inorganic fillers include talc, mica, wollastonite, wollastonite, and ceramic fibers. Adding a large amount of inorganic reinforcing materials can improve the strength and rigidity of polyoxymethylene, but due to the addition of a large amount of inorganic reinforcing materials, the stability of polyoxymethylene is often reduced to a considerable extent, which affects the appearance of the product and limits the strength of reinforced polyoxymethylene. field of application

In recent years, through the development of new co-monomers and new polymerization methods, a new type of polyoxymethylene has been developed, which has improved the rigidity and strength of polyoxymethylene. However, due to the difficulty of this technology and the large investment in development, this new type of polyoxymethylene Production and application of polyoxymethylene copolymer