Halogen-free intumescent flame retardant EVA and preparation method thereof

Abstract

The invention relates to a halogen-free intumescent flame retardant EVA and a preparation method thereof. The material comprises in mass percent: 50%-80% of an EVA base material, 15%-30% of a halogen-free intumescent flame retardant, 0%-0.2% of an anti-dropping agent, 0-0.5% of an antioxidant, and 0-2% of a lubricant. The halogen-free intumescent flame retardant consists of an organic-metal triazine hybrid SCTCA@ZnO as a carbon source and a gas source, and an acid source, and the mass ratio of a char forming agent to the acid source is 1:1-4:1. The halogen-free intumescent flame retardant is especially suitable for the halogen-free flame retardant of polyolefin materials, shortcomings that low flame retardant efficiency, large additive amount and the like of existing intumescent flame retardants are overcome, the adverse effects of the flame retardant on the mechanical properties of the matrix are reduced, and the production and use are very convenient. The halogen-free intumescent flame retardant EVA composite material has high flame retardant efficiency, no halogen, low smoke and low toxicity, and has excellent processing properties, so that the material can be widely used in many fields such as electronics and electronic appliances, automotive components and parts and the like.

Description

technical field

[0001] The invention relates to a halogen-free intumescent flame-retardant EVA, which belongs to the technical field of adding a specific flame-retardant component to EVA to obtain a flame-retardant EVA composite material. Background technique

[0002] Ethylene-vinyl acetate copolymer (EVA), as a copolymer of ethylene and vinyl acetate, has been widely used in many fields such as electronic appliances and insulating materials due to its excellent processability and physical and mechanical properties. Because EVA itself is easy to burn, it produces a lot of smoke when it burns, it is difficult to form charcoal, and it is accompanied by continuous dripping, which makes the flame spread and cause a fire. combustion modification.

[0003] The flame retardants currently used in EVA mainly include halogenated flame retardants and inorganic flame retardants. Due to the large amount of inorganic flame retardants added, poor compatibility with the matrix, and seriou...

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