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Chemically cross-linked polyethylene composition and preparation method thereof

A technology of chemical cross-linking and polyethylene, applied in the field of chemical cross-linking polyethylene composition and its preparation, can solve the problems of increasing the cost of cross-linking agent, decreasing the aging resistance of pipe products, decreasing the cross-linking efficiency, etc. Life, stable and reliable processing technology, and the effect of maintaining cross-linking density

Inactive Publication Date: 2011-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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AI Technical Summary

Problems solved by technology

On the one hand, this will increase the cost of the crosslinking agent. On the other hand, the antioxidants currently used in PE are hindered phenolic antioxidants, which can effectively capture the free radicals in the resin, and therefore also capture the free radicals produced by the decomposition of peroxides. Free radicals, a large number of free radicals produced by the added peroxide after pyrolysis will also consume part of the antioxidant, resulting in a decrease in crosslinking efficiency and a decrease in the aging resistance of pipe products

Method used

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Examples

Experimental program
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Embodiment 1～11

[0028]With 100 parts by weight of polyethylene resin (high-density polyethylene, HDPE, brand QL-3, Sinopec Qilu Petrochemical Co., Ltd. production), di-tert-butyl peroxide (DTBP, Beijing Guohua Chemical New Material Company production, industrial grade) (see Table 1 for specific consumption), triallyl cyanurate (TAC, produced by Germany Degussa Company, industrial product) (see Table 1 for specific consumption), antioxidant 1076 (Beijing Chemical Industry No. , industrial grade) and 0.3 part of co-antioxidant DSTP (Beijing No. 3 Chemical Factory, industrial grade) were placed in a high-speed mixer (GH-10 type, Beijing Rubber and Plastic Machinery Factory) for stirring treatment, and the treatment time was 10 minutes.

[0029] A plunger extruder (TSXL plunger extruder produced by Korea Taicheng Machinery Co., Ltd.) was used to extrude the above compounded mixture into a peroxide crosslinked HDPE pipe. The specific processing conditions are as follows: (1) The temperature of the...

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Abstract

The invention provides a chemically cross-linked polyethylene composition and relates to the technical field of peroxide cross-linked polyethylene. The composition is prepared by adding 100 parts by weight of polyethylene and 0.01-5 parts by weight of auxiliary cross-linking agent in the formula of the peroxide cross-linked polyethylene, wherein the auxiliary cross-linking agent is an allyl organic compound. According to the method provided by the invention, the allyl organic compound is added to be used as the auxiliary cross-linking agent, thus the use amount of organic peroxide can be effectively reduced, simultaneously the cross-linking density of a tubular product can be maintained and the oxidation induction period of the tubular product can be effectively prolonged, thereby prolonging the service life of the tubular product. The preparation method can be widely applied to the preparation of a chemical cross-linked polyethylene tubular product and has a good application prospect.

Description

technical field [0001] The present invention relates to a polyethylene composition, more specifically, to a chemically crosslinked polyethylene composition and a preparation method thereof. Background technique [0002] Polyethylene (PE) is one of the most widely used plastics. It has excellent chemical stability (almost insoluble in any solvent at room temperature), low temperature toughness, easy processing, low price and good dielectric properties. It is widely used in Many fields of industrial production and daily life. Ordinary polyethylene is a polymer composed of two elements, C and H, and its molecular formula is -CH 2 -CH 2 -, the molecular chain has a linear structure, and its biggest disadvantage is poor heat resistance and creep resistance, which limits its application in many fields. Especially for PE pipes, its temperature and pressure resistance, environmental stress cracking resistance, weather resistance, oil resistance and creep resistance are difficult ...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L23/06C08K5/3492C08K5/14C08L23/08
Inventor 吕明福张师军张薇张洪波陈力王小兰尹华张丽英张浩邵静波吕芸刘涛邹浩李杰李魁
Owner CHINA PETROLEUM & CHEM CORP
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