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Flame retardant conducting polymer composition

A conductive polymer and composition technology, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of potential safety hazards, easy combustion in case of fire, poor flame retardant effect, etc., to achieve improved dispersion, bio Uniform heat distribution, high safety and reliability

Inactive Publication Date: 2009-09-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PTC materials described in the above patents all have the disadvantages of being easy to burn in case of fire and poor flame retardant effect.
However, the self-controlling electric heating belt made of this kind of PTC material is usually mainly used in flammable and explosive occasions such as petroleum and chemical industry, and there are potential safety hazards.

Method used

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  • Flame retardant conducting polymer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 100 parts by weight of low-density polyethylene (melting temperature 105°C-115°C)

[0039] Carbon black (particle diameter 30nm-40nm) 45 parts by weight

[0040] Ammonium polyphosphate 30 parts by weight

[0041] Melamine 20 parts by weight

[0042] Aluminum hydroxide 15 parts by weight

[0043] Ethylene-ethyl acrylate copolymer 30 parts by weight

[0044] Calcium carbonate filler 6 parts by weight

[0045] Tetrakis-(4-hydroxy-3,5-tert-butylphenylpropionic acid) pentaerythritol ester 0.5 parts by weight

[0046]Trimethylol propane trimethacrylate 2 parts by weight

[0047] According to the above ratio, first add low-density polyethylene and ethylene-ethyl acrylate copolymer into the internal mixer, and after the polymer is completely plasticized, add carbon black, ammonium polyphosphate, melamine, aluminum hydroxide, calcium carbonate, Antioxidant and cross-linking agent, controlled mixing temperature 150°C, mixing time 20min, take out, hot press into 1mm and 3mm ...

Embodiment 2

[0049] High-density polyethylene (melting temperature 130°C-140°C) 100 parts by weight

[0050] Carbon black (particle diameter 80nm-100nm) 60 parts by weight

[0051] 30 parts by weight of triphenyl phosphite

[0052] 25 parts by weight of melamine cyanurate

[0053] Aluminum hydroxide 10 parts by weight

[0054] Ethylene-vinyl acetate copolymer 40 parts by weight

[0055] Calcium carbonate filler 6 parts by weight

[0056] Antioxidant 1010 0.5 parts by weight

[0057] Trimethylol propane trimethacrylate 2 parts by weight

[0058] According to the above ratio, first add high-density polyethylene and ethylene-vinyl acetate copolymer into the open mill, after the polymer is completely plasticized, add carbon black, triphenyl phosphite, melamine cyanurate, hydrogen Alumina, calcium carbonate, antioxidant and cross-linking agent, control the mixing temperature at 190°C, take out the mixing time for 10 minutes, hot press into samples with a thickness of 1mm and 3mm respectiv...

Embodiment 3

[0060] Linear low density polyethylene (melting temperature 120°C-130°C) 100 parts by weight

[0061] Carbon black (particle diameter 20nm-30nm) 45 parts by weight

[0062] Bisphenol A-two (diphenyl phosphate) 5 parts by weight

[0063] 35 parts by weight of melamine pyrophosphate

[0064] Magnesium hydroxide 50 parts by weight

[0065] Ethylene-acrylic acid copolymer 20 parts by weight

[0066] Zinc oxide filler 8 parts by weight

[0067] Tetrakis-(4-hydroxy-3,5-tert-butylphenylpropionic acid) pentaerythritol ester 0.5 parts by weight

[0068] Trimethylol propane trimethacrylate 0.5 parts by weight

[0069] According to the above ratio, first add linear low density polyethylene and ethylene-acrylic acid copolymer into the open mill, after the polymer is completely plasticized, add carbon black, bisphenol A-bis(diphenyl phosphate), melamine coke Phosphate, magnesium hydroxide, zinc oxide, antioxidant and cross-linking agent, control the mixing temperature at 170°C, take ...

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Abstract

The invention relates to a flame retardant conducting polymer composition with positive temperature coefficient (PTC) effect or characteristic. The composition is prepared by the following steps: placing a raw material mixture consisting of a crystalline thermoplastic polymer, a conductive filler, an adjuvant, a phosphorus flame retardant, a nitrogen flame retardant, a metal hydroxide and a polar polyolefin copolymer into a mixing device for mixing at the mixing temperature which is at least 20 DEG C higher than melting point of the crystalline thermoplastic polymer for 10-30 minutes; irradiating and crosslinking the mixed mixture with electron beams or gamma rays to obtain the composition. The PTC strength of the prepared target composition is more than 10<3>, resistivity is 10<3>omega.cm-10<5>omega.cm at the room temperature (25 DEG C), and oxygen index is larger than 27. The prepared composition also has the advantages of even joule heat distribution, excellent self-temperature conditioning property, low smoke and non-toxicity, and can be used for preparing environment-friendly self-temperature control electric heating devices with higher safety and reliability.

Description

technical field [0001] The invention relates to a conductive polymer composition, in particular to a flame-retardant conductive polymer composition with a positive temperature coefficient (Positive Temperature Coefficient, PTC for short) effect (or characteristic). Background technique [0002] The conductive polymer composite material with PTC characteristics composed of carbon black and other conductive fillers filled with crystalline polymers has the characteristics of easy molding, low cost, flexible and high PTC strength, and can be used to manufacture self-controlling electric heating belts and overcurrent protection devices, etc. [0003] So far, many patents have reported the composition and preparation methods of such composite materials. Such as US patents (US 3,914,363; US 4,318,881; US ​​4,514,620; US 5,068,518; US 5,143,649; US 6,660,795; US 6,773,634), European patents (EP 224903; EP 460790), Japanese patents (JP5 Zhao 58-212089; 042089; 4) Patents (CN 871049...

Claims

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Application Information

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IPC IPC(8): C08L101/00C08L23/06C08L23/12C08L23/20C08K13/02C08K3/32C08K5/524C08K3/02C08K5/3492C08K5/52C08K5/521C08K5/5317C08K3/22C08K3/04H01B1/24
Inventor 王庚超刘志军施静蔚李星玮张志平
Owner EAST CHINA UNIV OF SCI & TECH
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