Composite polyoxymethylene stabilizer and preparation method

Abstract

The invention relates to a compound polyformaldehyde stabilizer and a preparation method thereof. The mixture of an antioxidant 245 and an antioxidant 1098, or only the antioxidant 245, melamine, a lubricant such as EBS (Ethylene Bis Stearamide), and diethyl bis[(3.5ditertiary butyl-4-hydroxybenzene]methyl] phosphate calcium salt simultaneously having oxidation resistance and nucleation efficiency are compounded in a certain ratio, and blended sufficiently and evenly, and then the obtained compound material is applied to polyformaldehyde in the form of powdery or granular product to achieve dual purposes of excellent heat, oxygen and aging resistance and excellent degradability of the polyformaldehyde material and beneficial improvement of the crystallization property of the polyformaldehyde; therefore, the high-end application performance requirements of the polyformaldehyde can be met. In the meantime, on the basis of the stabilizer, light stabilizers, for example, hindered amine light stabilizers UV-622 and benzotriazole ultraviolet absorbents such as an ultraviolet absorbent UV-234, can be compounded; consequently, polyformaldehyde weather-proof stabilizers can be formed. The weather-proof stabilizers also can be used in the form of the sufficiently mixed powdery or granular product.

Description

Technical field [0001] The invention relates to a stabilizer and weathering stabilizer of polyoxymethylene and a preparation method thereof, and specifically to a stabilizer of polyoxymethylene used in the production, processing and end products of polyoxymethylene to keep polyoxymethylene stable and weathering stabilizer of polyoxymethylene products in use, and The preparation method of the above-mentioned composite polyoxymethylene stabilizer. Background technique [0002] Polyoxymethylene is one of the five major engineering plastics in the world, divided into two categories: one is homopolyoxymethylene, which has good strength, rigidity and fatigue resistance, but because it is entirely composed of carbon-oxygen bonds, it has Poor stability and easy degradation. The other type is copolyoxymethylene, which is obtained by ring-opening copolymerization of trioxymethylene and the introduced component dioxolane. Compared with homopolyoxymethylene, it has better thermal and chemic...

AI Technical Summary

Problems solved by technology

Although these nucleating agents to a certain extent: speed up the crystallization speed of polyoxymethylene; increase the crystallization temperature; refine the spherulites and affect the crystallinity, but there are: some nucleating agents reduce the tensile strength of polyoxymethylene, the gap The impact strength has not been improved, and the mechanical properties of the original polyoxymethylene are reduced, which has an adverse effect on the thermal properties and surface morphology of polyoxymethylene

Therefore, at present, the nucleating agents actually used in polyoxymethylene cannot meet the performance requirements of specific applications in terms of efficiency and cost, and are not generally recognized by the industry.

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