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Halogen-free intumescent flame retardant EVA and preparation method thereof

A technology of intumescent flame retardant and intumescent flame retardant, applied in the field of halogen-free intumescent flame retardant EVA, can solve problems such as unreported, achieve the effects of improving thermal stability and flame retardant performance, reducing adverse effects and overcoming low efficiency

Inactive Publication Date: 2019-06-07
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention is an organic-metal triazine hybrid carbon forming agent (SCTCA@ZnO) based on the high char formation of triazine compounds and the synergistic effect of ZnO, which can overcome the above shortcomings, and can be compounded with other components to form an IFR system for use in Flame retardant EVA, which has not been reported in the current literature and published materials

Method used

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  • Halogen-free intumescent flame retardant EVA and preparation method thereof
  • Halogen-free intumescent flame retardant EVA and preparation method thereof
  • Halogen-free intumescent flame retardant EVA and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, 25% by weight of halogen-free flame retardant (the mass ratio of APP to SCTCA@ZnO is 1:1) is compounded with 75% of EVA. Melt and mix evenly with a transformer, dry in vacuum at 80°C, pulverize with a pulverizer, melt and extrude in a twin-screw extruder, cool and cut into pellets to obtain a halogen-free intumescent flame-retardant EVA composite material. And measured its limiting oxygen index LOI, vertical burning UL-94 grade and data such as tensile strength and elongation at break, as shown in Table 2.

[0027] Table 1

[0028]

[0029] Table 2

[0030]

[0031]

Embodiment 2

[0033] In this example, the weight fraction is 20% of halogen-free flame retardant (the mass ratio of MP to SCTCA@ZnO is 2:1), 0.1% of anti-slump agent, 0.3% of antioxidant 1076, and 1.1% of lubricant solids Paraffin wax and 78.5% EVA are compounded, the formula is shown in Table 1, then blended uniformly in a high-speed mixer, vacuum-dried at 80°C, melted and extruded in a twin-screw extruder, cooled and pelletized Halogen-free intumescent flame-retardant EVA composite material was obtained. And measured its limiting oxygen index LOI, vertical burning UL-94 grade and data such as tensile strength and elongation at break, as shown in Table 2.

Embodiment 3

[0035] In this example, the weight fraction is 24.5% of halogen-free flame retardant (the mass ratio of MPP to SCTCA@ZnO char forming agent is 4:1), 0.05% of anti-slump agent, 0.15% of antioxidant 1010, 0.3% of The lubricant polyethylene wax is compounded with 75% EVA. The formula is shown in Table 1. Then it is mixed uniformly in a high-speed mixer, dried in vacuum at 80°C, and then melted and extruded in a twin-screw extruder. The halogen-free intumescent flame-retardant EVA composite material was prepared by cooling and pelletizing. And measured its limiting oxygen index LOI, vertical burning UL-94 grade and data such as tensile strength and elongation at break, as shown in Table 2.

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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...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L91/06C08L23/06C08K13/06C08K9/04C08K3/22C08K5/3492C08K3/32
Inventor 许博邵路山汪玲许准毕晓露马雯钱立军赵建明
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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