Environment-friendly halogen-free flame-proof copolymerized methanal complex and method for producing the same

Abstract

The invention relates to an environment-friendly halogen-free flame-retardant copolyoxymethylene compound and a preparation method thereof, belonging to the field of the preparation of flame-retardant polymer material. The compound comprises the components with the mass percentage as follows: 56.0-69.0 percent of copolyoxymethylene resin, 15.0-22.0 percent of flame retardant, 5.0-7.0 percent of flame retardant synergist, 3.0-7.0 percent of char-forming agent, 3.0-5.0 percent of toughener, 0.1-0.5 percent of formaldehyde absorbent, 0.1-1.0 percent of antioxidant and 0.5-3.0 percent of heat rejection and dripping-resistant agent. In the invention, the flame retardant, the flame retardant synergist and the heat rejection and dripping-resistant agent are coated by the toughener to manufacture compound flame retardant; then the compound flame retardant is mixed with the copolyoxymethylene, the formaldehyde absorbent, the char-forming agent and the antioxidant uniformly and the mixture is extruded from a double-screw extruder and granulated; and the copolyoxymethylene compound is obtained. The compound has good flame-retardant performance, the flame-retardant grade reaches UL94V-0 grade, and the compound is friendly to the environment.

Description

technical field [0001] The invention belongs to the field of preparation of flame-retardant polymer materials, and in particular relates to a halogen-free flame-retardant polyoxymethylene compound with environmental protection characteristics and a preparation method thereof. Background technique [0002] POM (Polyacetal, referred to as POM) was first industrialized in 1959 by Du Pont Company of the United States. Polyoxymethylene has the characteristics of excellent corrosion resistance, wear resistance and self-lubrication, creep resistance and outstanding fatigue resistance. It ranks third among the five major engineering plastics and is widely used in electronics, machinery manufacturing, automobiles and Precision instruments and many other fields. POM can be divided into homopolyoxymethylene and copolymerized polyoxymethylene according to different structures. Homopolyoxymethylene is synthesized from formaldehyde or paraformaldehyde. The repeating structural unit in t...

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Problems solved by technology

Japan Polyplastic Company uses triazine derivatives and phosphorus flame retardants to obtain a high limiting oxygen index for flame-retardant polyoxymethylene, but its mechanical properties decline seriously

Chinese patent CN1810881 uses a thermoplastic polyurethane-based composite flame retardant to flame-retardant polyoxymethylene, which solves the problem of poor compatibility between the flame retardant and polyoxymethylene, and realizes the uniform dispersion of the flame retardant in the polyoxymethylene resin, but the flame retardancy of its products Performance only reaches UL94V-1 level