Halogen-free flame retardant olefin foam body and preparation method thereof

Abstract

The invention discloses a halogen-free flame retardant olefin foam body which comprises the following preparation materials (in terms of weight): (1) 50-120 parts of ethylene-vinyl acetate (EVA) copolymer, (2) 10-80 parts of polyolefin elastomers (POE), (3) 10-35 parts of foaming agent, (4) 1-10 parts of blowing promoter, (5) 1-6 parts of coupling agent, (6) 1-6 parts of antioxidant, (7) composite flame retardant which is the mixture of 6-15 parts of red phosphorus or phosphate flame retardant, 30-80 parts of magnesium hydroxide and 5-20 parts of zinc borate, or the mixture of 20-66 parts of ammonium polyphosphate, 10-36 parts of melamine pyrophosphate or polyphosphate and 7-24 parts of pentaerythritol; and the materials are mixed, mill-mixed , extruded, radiated and foamed, so that the foaming body is prepared. The halogen-free flame retardant olefin foaming body disclosed by the invention is a halogen-free high flame retardant olefin foaming body, which has the advantages that the foaming expansion magnification is high, broken holes are hardly formed in the foaming process, the foaming body structure is not damaged, and the mechanical performance is high.

Description

technical field [0001] The invention relates to a foam and a preparation method thereof, in particular to a halogen-free flame-retardant olefin foam and a preparation method thereof. Background technique [0002] At present, with the progress of society and the emphasis on the safety of life and property, the foam needs to have the function of halogen-free flame retardant. The industry adopts the method of adding halogen-free flame retardant to realize the halogen-free flame retardant of halogen-free flame-retardant foam need. [0003] In 1974, Japanese Patent Application No. 49-5171 and Japanese Patent Application No. 3-269029 in 1991 proposed adding a large amount of inorganic substances such as aluminum hydroxide or magnesium hydroxide to the foam; US4698369 in 1987 utilized expanded graphite as Fire retardant is added to PU soft foam to achieve fire prevention effect. [0004] However, adding a large amount of aluminum hydroxide or magnesium hydroxide will cause the me...

AI Technical Summary

Problems solved by technology

[0004] However, adding a large amount of aluminum hydroxide or magnesium hydroxide will cause the mechanical properties of the foam to decrease, and cause the uniformity of the bubbles in the foam to be destroyed; the effect of using expanded graphite or polyphosphate amine alone as a fire retardant is not good obvious

[0005] Chinese Invention Publication No. CN1786065A discloses an olefinic resin and olefinic thermoplastic elastomer high flame-retardant foam and its manufacturing method. The olefinic resin and olefinic thermoplastic elastomer high flame-retardant foam has a relatively good foam structure In the case of low foaming expansion ratio, high density and high cost, and in the case of increasing the content of foaming agent to increase the foaming expansion ratio, the foam will form holes during the foaming process and destroy the foaming. Body structure and physical mechanical properties