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Expanded halogen-free flame-retardant EVA-based composite material and preparation method thereof

A composite material and an intumescent technology, which is applied in the field of intumescent halogen-free flame retardant EVA-based composite materials and their preparation, can solve the problems of flame retardant efficiency or environmental protection requirements that cannot meet the performance requirements of new flame retardant composite materials, and can achieve particle size. Small diameter, improved flame retardant performance, and simple preparation method

Active Publication Date: 2017-02-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pentaerythritol (PER) was used as a carbon source in the early days, but with the further development of flame retardant research, pentaerythritol has been unable to meet the performance requirements of new flame retardant composite materials in terms of flame retardant efficiency and environmental protection requirements

Method used

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  • Expanded halogen-free flame-retardant EVA-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 50g of EVA pellets, 12.5g of starch, 35.5g of ammonium polyphosphate, and 2g of nitrogen-based trimethylene zirconium phosphate. After mixing the above pellets evenly, at a temperature of 195°C and a screw speed of 25r / min, the Twin-screw extruder melts and blends in melting, makes the EVA-based composite material of the present invention, and its electron microscope figure is as follows: figure 1 As shown, the particle size of the prepared product is smaller, which is nanometer size. After testing, the limiting oxygen index is 28.5%, the UL-94 test reaches V-0 level, and there is no droplet phenomenon. The tensile strength of the composite is 9.17 MPa, and the elongation at break is 115.6%.

Embodiment 2

[0024] Weigh 50g of EVA pellets, 12.5g of starch, 34.5g of ammonium polyphosphate, and 3g of zirconium nitrogen trimethylene phosphate. After mixing the above pellets evenly, at a temperature of 195°C and a screw speed of 25r / min, Melt-in-melt blending in a twin-screw extruder to prepare the EVA-based composite material of the present invention. After testing, the limiting oxygen index is 30.0%, and the UL-94 test reaches V-0 level, and there is no droplet phenomenon. The tensile strength of the composite is 10.29 MPa, and the elongation at break is 104.9%.

Embodiment 3

[0026] Weigh 50g of EVA pellets, 12.5g of starch, 33.5g of ammonium polyphosphate, and 3g of zirconium nitrogen trimethylene phosphate. After mixing the above pellets evenly, at a temperature of 195°C and a screw speed of 25r / min, the Melt-in-melt blending in a twin-screw extruder to prepare the EVA-based composite material of the present invention. After testing, the limiting oxygen index is 31.0%, the UL-94 test reaches V-0 level, and there is no droplet phenomenon. The tensile strength of the composite is 9.54 MPa, and the elongation at break is 101.2%.

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Abstract

The invention discloses an expanded halogen-free flame-retardant EVA-based composite material and a preparation method thereof. The preparation method is characterized in that a synergistic flame retardant, namely Zirconate-Amino Trimethylene Phosphonic Acid (Zr-ATMP) is synthesized under hydrothermal conditions by taking nitrogen-based trimethylene phosphoric acid and zirconium oxychloride as raw materials; the flame-retardant composite material is prepared from EVA, a char-forming agent (starch), a flame retardant and the synergistic flame retardant in manners of extrusion and dicing; the mass percentage ratio of the EVA to the char-forming agent to the flame retardant to the synergistic flame retardant is 50:12.5:(35.5-32.5):(2-5). The composite material has the advantages that the raw materials are poisonless and harmless, the preparation way is simple and safe, a role in obviously improving the flame retardance and the mechanical property of the EVA is played, particularly, a role in obviously promoting char forming is played during combustion, and the molten drop phenomenon is eliminated.

Description

technical field [0001] The invention relates to the fields of flame retardancy, reinforcement and toughening of EVA-based composite materials, in particular to an intumescent halogen-free flame-retardant EVA-based composite material and a preparation method thereof. Background technique [0002] EVA is a copolymer of ethylene and vinyl acetate, and it is also another large type of ethylene copolymer juxtaposed with low-density polyethylene, high-density polyethylene, and linear low-density polyethylene. Due to its excellent flexibility, good filler compatibility, low temperature resistance, aging resistance, corrosion resistance and other properties, EVA has very broad development prospects in the fields of thin films, foam materials, automobile industry, and electronics industry. . However, EVA is a kind of flammable material, so EVA must be added with a flame retardant to enhance its flame retardant performance in practical applications. [0003] Since the fourth layer o...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L3/02C08K3/32C08K5/52
CPCC08K2201/003C08L23/0853C08L2201/02C08L2201/08C08L2201/22C08L3/02C08K2003/323C08K5/5205
Inventor 王新龙李嘉玮代秀曹雨石小卫霍长安
Owner NANJING UNIV OF SCI & TECH
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