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Method for producing ultrahigh molecular weight polyethylene

A technology of ultra-high molecular weight and production method, which is applied in the production field of ultra-high molecular weight polyethylene, can solve the problems of difficult molecular weight operation, etc., and achieve the effect of simple and easy process, high industrial production value and improved performance

Inactive Publication Date: 2018-06-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent ZL00819563.3 proposes a mixture of magnesium halide compound and aluminum or boron chemical compound and alcohol compound to prepare magnesium compound solution, add hydroxyl-containing ester compound and alkoxy-containing silicon compound, and then add titanium compound to prepare Catalyst, can be used for producing ultra-high molecular weight polyethylene; Patent CN1076456A discloses a kind of MgCl 2 and ZnCl 2 Composite carrier catalyst system to prepare ultra-high molecular weight polyethylene; patent CN93103156.7 proposes to use composite titanium catalyst to change Zn / Ti in catalyst components to adjust molecular weight, but the patent needs to change its components to adjust molecular weight, that is, it needs to prepare different Catalyst, so it is difficult to adjust the molecular weight of ultra-high molecular weight polyethylene

Method used

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  • Method for producing ultrahigh molecular weight polyethylene
  • Method for producing ultrahigh molecular weight polyethylene

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Using a 2L reactor, carry out at least 3 times N 2 Purging to remove water and deoxygenation treatment, add 600ml of hexane, and add 8mg of main catalyst with hexane, appropriate amount of co-catalyst, Al / Ti in co-catalyst / main catalyst is 100:1, appropriate amount of external electron donor dimethyl dimethyl Oxysilane, dimethyldimethoxysilane / Ti=0.2 (molar ratio), the total amount of hexane added is 1L, the temperature of the reaction system is raised, when the temperature rises to 65°C, ethylene gas is added, and the reaction is carried out at a constant pressure of 0.7Mpa , control the reaction temperature at 72°C until the end of the polymerization, lower the temperature and exhaust, separate the solid and liquid phases, and dry to obtain ultra-high molecular weight polyethylene. The experimental results are shown in Table 1.

Embodiment 2

[0041] Adjust the amount of external electron donor added, dimethyldimethoxysilane / Ti=0.1 (molar ratio), other conditions are the same as in Example 1, and the experimental results are shown in Table 1.

Embodiment 3

[0043] Adjust the amount of external electron donor, dimethyldimethoxysilane / Ti=0.5 (molar ratio), other conditions are the same as in Example 1, and the experimental results are shown in Table 1.

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Abstract

The invention discloses a method for producing ultrahigh molecular weight polyethylene with M miu of 1.5-8 million. The method comprises that an external electron donor is added into a reaction systemin the presence of a main catalyst and a cocatalyst and then the system undergoes homopolymerization of ethylene. Through the use amount of the silane external electron donor, the molecular weight ofthe ultrahigh molecular weight polyethylene is adjusted without change of catalyst conditions and through use of the ester external electron donor, the particle size and distribution of the ultrahighmolecular weight polyethylene powder are improved. The method has the advantages of control of technical conditions and temperature, simple operation and remarkable industrial value.

Description

technical field [0001] The invention relates to a production method of ultra-high molecular weight polyethylene. Background technique [0002] Ultra-high molecular weight polyethylene generally refers to polyethylene with a viscosity average molecular weight of more than 1.5 million, and its chain length is 10 to 20 times that of ordinary HDPE. Ultra-high molecular weight polyethylene has excellent wear resistance, impact resistance, impact absorption, self-lubricating properties, chemical corrosion resistance, low temperature resistance, insulation properties, etc. It is an engineering plastic prepared from ordinary ethylene and other raw materials. [0003] At present, Ti-Mg catalyst system is often used as a catalyst for preparing ultra-high molecular weight polyethylene. Due to the extremely high molecular weight of ultra-high molecular weight polyethylene, it is impossible to obtain ideal products with extremely high molecular weight by using conventional polyethylene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/646C08F4/649
CPCC08F110/02C08F4/6465C08F4/6494
Inventor 张元礼郭洪元焦金华王健侯维高嵩冯文元张利仁刘冬张利粉徐丽艳崔月王俊荣王大明刘志军孙辉宇崔勇王金萍
Owner PETROCHINA CO LTD
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