Polyoxymethylene resin composition and preparation method thereof

Abstract

The invention provides a polyformaldehyde resin composition which comprises polyformaldehyde, an inorganic material, coupling agents, an antioxidant, a formaldehyde absorbing agent and a nucleating agent, wherein the coupling agents are two or more of 2-(3,4-epoxy-cyclohexyl)ethyl trimethoxysilane, 3-glycidyloxypropyltriethoxysilane, gamma-glycidyloxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane and gamma-aminopropyltriethoxysilane. The coupling agents can be used for not only effectively improving interfacial properties of the inorganic material and strengthening the bonding of the formaldehyde resin and the inorganic material, but also further improving the strength, modulus and heat resistance of the poly formaldehyde resin composition, and meanwhile effectively solving the problem of the yellow color of the composition, and thus the prepared composition tends to be in a natural color.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyoxymethylene resin composition and a preparation method thereof. Background technique [0002] Polyoxymethylene is a thermoplastic engineering plastic with high crystallinity and high melting point, and it is one of the varieties whose mechanical properties are closest to metal materials in engineering plastics; Because of its excellent mechanical properties, such as high strength, good rigidity, strong impact resistance, fatigue resistance, wear resistance, dimensional stability, self-lubricating and solvent resistance, as well as low price and convenient forming and processing, it is used to replace Non-ferrous metals and alloys are widely used in industries such as automobiles, electronic appliances, chemicals, and hardware and building materials; however, polyoxymethylene still has low strength and load heat in the application of automotive sun roof frames, se...

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Problems solved by technology

[0002] Polyoxymethylene is a thermoplastic engineering plastic with high crystallinity and high melting point, and it is one of the varieties whose mechanical properties are closest to metal materials in engineering plastics; Because of its excellent mechanical properties, such as high strength, good rigidity, strong impact resistance, fatigue resistance, wear resistance, dimensional stability, self-lubricating and solvent resistance, as well as low price and convenient forming and processing, it is used to replace Non-ferrous metals and alloys are widely used in industries such as automobiles, electronic appliances, chemicals, and hardware and building materials; however, polyoxymethylene still has low strength and load heat in the application of automotive sun roof frames, seat systems, and automotive fuel systems. Low deformation temperature and other issues, therefore, a reinforced polyoxymethylene resin composition was developed

[0003] At present, reinforced polyoxymethylene resin compositions are mainly obtained by mixing long / short glass fibers, carbon fibers, glass beads, talcum powder or potassium titanate whiskers, polyoxymethylene resins and other additives, wherein long / short glass fibers, carbon fibers , Glass beads, talc powder or potassium titanate whiskers are inorganic materials, while polyoxymethylene resin is an organic polymer material. Usually, it is difficult to combine organic materials and inorganic materials, so it is necessary to add a coupling agent to make the two effectively combined. , the coupling agent is a kind of substance with two functional groups of different properties. The biggest characteristic of its molecular structure is that the molecule contains two groups with different chemical properties. One is an inorganic-philic group, which is easy to react with the inorganic surface. The other is an organophilic group, which can chemically react with synthetic resins or other polymers or generate hydrogen bonds to dissolve in them, and then form a "molecular bridge" between organic materials and inorganic materials to achieve organic-inorganic materials. Therefore, in the modification of polyoxymethylene, the coupling agent is often used as an important surface treatment agent in the modification, especially for the modification of inorganic materials. Processing has very important effect; But when the coupling agent of polyoxymethylene composition commonly used now is used for strengthening the bond strength of inorganic material and polyoxymethylene as KH550, A-1100, Z-6011, the polyoxymethylene composition obtained However, in actual production, the requirements for the appearance and color of the product are relatively high. Therefore, researchers try to add whitening agents to the material to improve the color of the product, but the increase of the whitening agent reduces the stability of the polyoxymethylene composition. In addition, Adopt coupling agent KH560 or A187, although the color of product can be lightened, the tensile strength and modulus of product are not good either, therefore, seeking a kind of coupling agent can make the strength of reinforced polyoxymethylene resin composition high and not Yellowing is a technical problem that needs to be solved at present

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