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Halogen-free non-red-phosphorus flame-retardant thermal shrinkable tube and preparation method thereof

A technology of heat-shrinkable tubes and red phosphorus, which is applied in the direction of plastic/resin/wax insulators, organic insulators, conductors, etc., can solve problems such as red phosphorus failures, and achieve the effect of smooth surface and excellent processing performance

Inactive Publication Date: 2012-07-18
长园科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the defect that the existing heat-shrinkable tube uses red phosphorus, which is easy to cause failure, and to provide a red phosphorus-free and flame-retardant effect Good heat-shrinkable tubing and its preparation method

Method used

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Effect test

preparation example Construction

[0031] The present invention proposes a method for preparing the halogen-free and red phosphorus-free flame-retardant heat-shrinkable tube, which includes the following steps:

[0032] Step 1: Take 100 parts by weight of basic resin, 60-80 parts of melamine phosphate, 10-20 parts of melamine cyanuric acid, 10-20 parts of pentaerythritol, 1-3 parts of composite antioxidant, and 2-5 parts of lubricant;

[0033] Step 2: Mix and granulate through internal mixing or parallel twin-screw extruder, and then extrude into pipes with a single-screw extruder;

[0034] Step 3: The tube is cross-linked by cobalt 60 or electron accelerator 50-180KGy radiation, and the tube after radiation cross-linking is expanded 2-4 times at a temperature of 90-150°C.

preparation Embodiment 1

[0036] Take 80 parts of ethylene-hexene acetate copolymer, 10 parts of ethylene-octene copolymer, 10 parts of EPDM rubber, 60 parts of melamine phosphate, 20 parts of melamine cyanuric acid, 20 parts of pentaerythritol, four [β-(3 , 5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and di(octadecyl) thiodipropionate according to the ratio of 1:1 compound antioxidant 3 parts, polyethylene wax 3 parts, 2 parts of zinc stearate.

[0037] The above materials are mixed and granulated by banburying, extruded by a single-screw extruder into pipes, and the pipes are cross-linked by cobalt 60 or electron accelerator 100KGy radiation.

[0038] After radiation cross-linking, the tube expands twice at 120°C, and the properties of the obtained halogen-free and red phosphorus-free flame-retardant heat-shrinkable tube are as follows:

[0039] Flame retardancy: VW-1 passed, tensile strength: 13.1Mpa, elongation at break: 360%, and the product surface is smooth.

preparation Embodiment 2

[0041] Take 10 parts of low-density polyethylene, 90 parts of ethylene-methyl acrylate copolymer, 80 parts of melamine phosphate, 10 parts of melamine cyanuric acid, 10 parts of pentaerythritol, tetrakis[β-(3,5-di-tert-butyl-4- Hydroxyphenyl) propionic acid] pentaerythritol ester and di(octadecyl) thiodipropionate compounded at a ratio of 1:1, 1 part of composite antioxidant, 2 parts of zinc stearate.

[0042] The above materials are mixed and granulated by banburying, extruded by a single-screw extruder into pipes, and the pipes are cross-linked by cobalt 60 or electron accelerator 100KGy radiation.

[0043] After radiation cross-linking, the tube expands twice at 120°C, and the properties of the obtained halogen-free and red phosphorus-free flame-retardant heat-shrinkable tube are as follows:

[0044] Flame retardancy: VW-1 passed, tensile strength: 12Mpa, elongation at break: 300%, and the product surface is smooth.

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Abstract

The invention relates to a halogen-free non-red-phosphorus flame-retardant thermal shrinkable tube which consists of the following components by weight: 100 parts of base resin, 60 to 80 parts of melamine phosphate ester, 10 to 20 parts of melamine cyanuric acid, 10 to 20 parts of pentaerythritol, 1 to 3 parts of complex antioxidant and 2 to 5 parts of lubricant. The base resin is a mixture of one or a plurality of the following substances: low-density polyethylene, ethylene methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer and ethylene-propylene-diene monomer; and the complex antioxidant is formed by compounding pentaerythrite tetra [beta-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] with disteaxyl thiodipropionate according to a ratio of 1:1. The halogen-free non-red-phosphorus flame-retardant thermal shrinkable tube disclosed by the invention does not contain red phosphorus. The flame-retardant performance of the halogen-free non-red-phosphorus flame-retardant shrinkable tube can pass through the VM-1 test.

Description

technical field [0001] The invention relates to a heat-shrinkable pipe material and a preparation method thereof. Background technique [0002] ; On July 1, 2006, the EU RoHS directive came into effect, and in November 2006, my country's electronic industry standard SJ / T 11363-2006 "Limit Requirements for Toxic and Hazardous Substances in Electronic Information Products" came into effect, prohibiting the use of lead, Mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) and other six harmful substances. In response to the EU RoHS directive, various manufacturers replace polybrominated biphenyls (PBB) and polybrominated diphenyl ethers with red phosphorus (PBDE), manufacturing flame retardant heat shrink tubing. [0003] However, when red phosphorus burns, it will release toxic and irritating smoke, corrode human skin and mucous membranes, and endanger human health. The silver reacts electrochemically and connects the ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08L33/08C08L31/02C08L23/20C08L23/16C08K5/3492C08K5/053C08J3/28C08J3/24H01B3/44H01B7/295
Inventor 赵成刚刘军谢世平尹沾松曾志安
Owner 长园科技集团股份有限公司
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