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Blow moulding material being resistant to environmental stress cracking and being specially used for automobile plastic fuel tank

A technology that is resistant to environmental stress and fuel tanks, applied in the field of blow molding plastics, can solve the problems of high safety performance requirements, expensive raw materials, and difficulty in ensuring supply, and achieve outstanding low-temperature impact resistance, excellent rigidity and toughness balance, excellent Effects of Environmental Stress Cracking Resistance

Active Publication Date: 2016-03-23
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the constraints of the production process, the domestic HDPE production equipment is difficult to produce the special blow molding materials for automobile plastic fuel tanks (referred to as special materials for automobile fuel tanks) that meet the requirements and can be applied to six-layer fuel tanks, and the special materials for automobile fuel tanks The safety performance requirements are high, and it needs to be tested by the safety performance certification of the automobile industry. The localization of automobile plastic fuel tanks has become a difficult problem to solve. The special materials for automobile fuel tanks have to rely on imports in large quantities. The raw materials are expensive and difficult to guarantee supply.

Method used

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  • Blow moulding material being resistant to environmental stress cracking and being specially used for automobile plastic fuel tank
  • Blow moulding material being resistant to environmental stress cracking and being specially used for automobile plastic fuel tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Raw materials for ethylene-hexene copolymerized polyethylene resin:

[0042] 1) The feed rate of polymer grade ethylene is 30t / h

[0043] 2) Catalyst: Chromium-based catalyst Magnapore? 963, adding amount 112kg / h

[0044] 3) The amount of 1-hexene added is 457kg / h

[0045] 4) diluent isobutane 36kg / h

[0046] The preparation method of ethylene-hexene copolymerized polyethylene:

[0047] The diluent isobutane is always in a circulating state. The ethylene and 1-hexene are injected into the loop reactor respectively, the ethylene-hexene feed ratio is strictly controlled, and the activated catalyst is added to control the reaction temperature in the reactor to 94.8 ℃, ethylene feed rate is 30t / h, 1-hexene feed rate is 457kg / h, catalyst feed rate is 112kg / h, the melt flow rate of ethylene and 1-hexene reaction is 6.2g / 10min, and the density is 0.945kg / h m 3 The ethylene-hexene copolymerized polyethylene resin has a molecular weight distribution of 15.3 and a weight...

Embodiment 2

[0058] Raw materials for ethylene-hexene copolymerized polyethylene resin:

[0059] 1) The feed rate of polymer grade ethylene is 38t / h

[0060] 2) Catalyst: Chromium-based catalyst Magnapore? 963, adding amount 149kg / h

[0061] 3) The amount of 1-hexene added is 795kg / h

[0062] 4) diluent isobutane 36.8kg / h

[0063] The preparation method of ethylene-hexene copolymerized polyethylene resin:

[0064] The diluent isobutane is always in a circulating state, inject ethylene and 1-hexene into the loop reactor respectively, strictly control the feed ratio of ethylene and hexene, and add a pre-activated catalyst to control the reaction temperature in the reactor to 98.2 ℃, the feed rate of ethylene is 38t / h, the feed rate of 1-hexene is 795kg / h, the feed rate of catalyst is 149kg / h, the melt flow rate of ethylene and 1-hexene is 5.4g / 10min, and the density is 0.945 kg / m 3 The ethylene-hexene copolymerized polyethylene resin has a molecular weight distribution of 16.8 and a...

Embodiment 3

[0075] Raw materials for ethylene-hexene copolymerized polyethylene resin:

[0076] 1) The feed rate of polymer grade ethylene is 33.8t / h

[0077] 2) Catalyst: Chromium-based catalyst Magnapore? 963, adding amount 196.1kg / h

[0078] 3) The amount of 1-hexene added is 842.8kg / h

[0079] 4) diluent isobutane 35.8kg / h

[0080] The preparation method of ethylene-hexene copolymerized polyethylene resin:

[0081] The diluent isobutane is always in a circulating state, inject ethylene and 1-hexene into the loop reactor respectively, strictly control the feed ratio of ethylene and hexene, and add a pre-activated catalyst to control the reaction temperature in the reactor to 95 ℃, the feed rate of ethylene is 33.8tt / h, the feed rate of 1-hexene is 842.8kg / h, the feed rate of catalyst is 196.1kg / h, the melt flow rate obtained by the reaction of ethylene and 1-hexene is 5.5g / 10min, The density is 0.945kg / m 3 The ethylene-hexene copolymerized polyethylene resin has a molecular we...

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Abstract

The invention discloses a blow moulding material being resistant to environmental stress cracking and being specially used for automobile plastic fuel tanks. The blow moulding material has environmental stress cracking resistance being more than 8000 h. The blow moulding material is mainly prepared from following raw materials, by weight: 99.50-99.80 parts of ethylene-hexylene polymerized polyethylene resin, 0.05-0.35 parts of an anti-oxidant, 0.03-0.15 parts of an auxiliary anti-oxidant and 0.02-0.06 parts of a demoulding agent. The blow moulding material is high in melt strength, excellent in environmental stress cracking resistance and creep resistance, and excellent in chemical corrosion resistance, and is suitable for processing and moulding single-layer and multi-layer automobile plastic fuel tanks.

Description

technical field [0001] The invention belongs to the field of blow molding plastics, in particular to a special blow molding material for automotive plastic fuel tanks resistant to environmental stress cracking. Background technique [0002] The plasticization of fuel tanks is an important direction of modern automobile plasticization. With the requirements of automobile lightweight and the continuous development of high-density polyethylene material properties, plastics are more and more widely used in automobiles, and the application of automobile plastics is even greater. It has become one of the symbols to measure the level of automobile production technology and the level of new material research and development. Compared with metal fuel tanks, automotive plastic fuel tanks are light in weight, can be integrally formed, have flexible shape design, good anti-seepage and corrosion resistance, simple production process, high efficiency and long service life. [0003] Plast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K5/098C08K5/134C08K5/526C08F210/16C08F210/14
CPCC08F210/16C08F2400/02C08K5/098C08K5/1345C08K5/526C08L23/0815C08F210/14
Inventor 岑静芸钟向宏蔡伟梁戈张玮梁胜彪许敏谭捷马宇罡
Owner CHINA PETROLEUM & CHEM CORP
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