Preparation method for halogen-free flame-retardant high-density polyethylene/ethylene-vinyl acetate polymer

A technology of high-density polyethylene and vinyl acetate, which is applied in the direction of plastic/resin/wax insulators, organic insulators, electrical components, etc., and can solve problems such as low flame retardancy, unreachable, and inability to meet engineering application requirements

Inactive Publication Date: 2014-02-05
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-density polyethylene / ethylene-vinyl acetate copolymer has the advantages of non-toxic, cheap, easy to form and process, good toughness, good impact resistance, and crack resistance. Therefore, it is widely used in wires and cables, but its flame retardant It has extremely poor performance, is extremely flammable, and has severe melting droplets when burning, and produces a lot of smoke and toxic gases, which limits the application range of high-density polyethylene / ethylene-vinyl acetate copolymer. Therefore, it is flame retardant Gaining importance
The high-density polyethylene / ethylene-vinyl acetate copolymer added with halogen flame retardant has good flame retardancy, but it is limited because it releases toxic gas when burning, which is extremely harmful to the environment and human health
Add metal hydroxide flame retardants, such as magnesium hydroxide, aluminum hydroxide, etc., to make the vertical combustion test of the material reach the V-0 level, the addition of halogen-free flame retardant must be greater than 50%, resulting in the material's The mechanical properties are seriously deteriorated; some C 60 Surface-grafted intumescent flame retardants are used to flame-retardant high-density polyethylene / ethylene-vinyl acetate copolymers. Although the addition amount is small, its flame-retardant performance is low, and it still cannot reach the vertical burning UL-94V-0 level. Unable to meet engineering application requirements

Method used

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  • Preparation method for halogen-free flame-retardant high-density polyethylene/ethylene-vinyl acetate polymer
  • Preparation method for halogen-free flame-retardant high-density polyethylene/ethylene-vinyl acetate polymer
  • Preparation method for halogen-free flame-retardant high-density polyethylene/ethylene-vinyl acetate polymer

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Embodiment 1

[0028] A preparation method of a halogen-free flame-retardant high-density polyethylene / ethylene-vinyl acetate copolymer, the specific method of which is:

[0029] I. Add 2 parts by weight of silane coupling agent to 180 parts by weight of absolute ethanol, mix well, heat in a water bath to 80°C, then add 100 parts by weight of dry expandable graphite to the solution, stir for 30 minutes, and the stirring speed 1500 rpm to obtain modified expandable graphite; wherein the average particle size of dry expandable graphite is 45 μm.

[0030] II, the modified expandable graphite of 13.3 parts by weight, the high-density polyethylene of 70 parts by weight, the ethylene-vinyl acetate copolymer of 30 parts by weight, the ammonium polyphosphate of 3.35 parts by weight, the phosphorus content of 3.35 parts by weight (weight ) is a 60% red phosphorus flame retardant masterbatch, which is placed in a mixer and mixed evenly to obtain a mixture.

[0031] III. Use a twin-screw extruder to k...

Embodiment 2

[0033] A preparation method of a halogen-free flame-retardant high-density polyethylene / ethylene-vinyl acetate copolymer, the specific method of which is:

[0034] I. Add 3 parts by weight of silane coupling agent to 200 parts by weight of absolute ethanol, mix well, heat to 70°C in a water bath, then add 100 parts by weight of dry expandable graphite to the solution, stir for 20min, and the stirring speed at 1200 rpm to obtain modified expandable graphite; wherein the average particle size of dry expandable graphite is 50 μm.

[0035] II, with 15 parts by weight of modified expandable graphite, 70 parts by weight of high-density polyethylene, 30 parts by weight of ethylene-vinyl acetate copolymer, 2.5 parts by weight of ammonium polyphosphate, 2.5 parts by weight of phosphorus content (weight ) is a 55% red phosphorus flame retardant masterbatch, which is placed in a mixer and mixed evenly to obtain a mixture.

[0036] III. Use a twin-screw extruder to knead and granulate th...

Embodiment 3

[0038] A preparation method of a halogen-free flame-retardant high-density polyethylene / ethylene-vinyl acetate copolymer, the specific method of which is:

[0039]I. Add 4 parts by weight of silane coupling agent into 220 parts by weight of absolute ethanol, mix well, heat in a water bath to 90°C, then add 100 parts by weight of dry expandable graphite into the solution, stir for 40min, and the stirring speed 2000rpm to obtain modified expandable graphite; wherein the average particle size of dry expandable graphite is 40μm.

[0040] II, with 10 parts by weight of modified expandable graphite, 70 parts by weight of high-density polyethylene, 30 parts by weight of ethylene-vinyl acetate copolymer, 5 parts by weight of ammonium polyphosphate, 5 parts by weight of phosphorus content (weight ) is a 65% red phosphorus flame retardant masterbatch, which is placed in a mixer and mixed evenly to obtain a mixture.

[0041] III. Use a twin-screw extruder to knead and granulate the mixt...

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Abstract

The invention discloses a preparation method for a halogen-free flame-retardant high-density polyethylene/ethylene-vinyl acetate polymer. The preparation method specifically comprises the following steps: I, adding 2 to 4 parts by weight of silane coupling agent into 180 to 220 parts by weight of anhydrous alcohol, mixing the silane coupling agent and the anhydrous alcohol uniformly, heating the mixture to 70 to 90 DEG C, adding 100 parts by weight of dried expandable graphite into the solution, and stirring to obtain modified expandable graphite; II, uniformly mixing 5 to 15 parts by weight of modified expandable graphite, 70 parts by weight of high-density polyethylene, 30 parts by weight of ethylene-vinyl acetate polymer, 2.5 to 7.5 parts by weight of ammonium polyphosphate and 2.5 to 7.5 parts by weight of red phosphorus flame retardant master batch in a mixer to obtain a mixture; III, mixing and granulating the mixer by using a screw extruder, drying the extruded granules and performing injection molding on the dried granules. The prepared composite material has high flame retardant property and high mechanical property.

Description

technical field [0001] The invention relates to a preparation method of a halogen-free flame-retardant high-density polyethylene / ethylene-vinyl acetate copolymer. Background technique [0002] High-density polyethylene / ethylene-vinyl acetate copolymer has the advantages of non-toxic, cheap, easy to form and process, good toughness, good impact resistance, and crack resistance. Therefore, it is widely used in wires and cables, but its flame retardant It has extremely poor performance, is extremely flammable, and has severe melting droplets when burning, and produces a lot of smoke and toxic gases, which limits the application range of high-density polyethylene / ethylene-vinyl acetate copolymer. Therefore, it is flame retardant Gaining importance. The high-density polyethylene / ethylene-vinyl acetate copolymer added with halogen flame retardant has good flame retardancy, but it is limited because it releases toxic gas when it burns, which is extremely harmful to the environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08K13/06C08K9/06C08K3/04C08K3/32C08K3/02H01B3/44
CPCC08K2201/003C08L23/06C08L2201/02C08L2201/22C08L2203/20C08L2203/202C08L2207/062H01B3/441C08L23/0853C08K9/06C08K7/24C08K2003/323C08K2003/026
Inventor 陈晓浪孙志丹徐阳陈漫马永红张志斌
Owner SOUTHWEST JIAOTONG UNIV
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