Preparation method of ultra-high molecular weight polyethylene catalyst

A technology of ultra-high molecular weight and polyethylene, applied in the production of bulk chemicals, etc., can solve the problems of catalyst activity and polymer molecular weight increase range, and achieve the effects of easy polymerization control, promotion of re-precipitation, and promotion of activity

Active Publication Date: 2016-04-13
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing technology mainly focuses on improving catalyst activity, polymer molecular weight and polymer bulk density, etc., but the improvement of catalyst activity and polymer molecular weight is limited, and the polymerization products do not involve the field of low bulk density resins.

Method used

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  • Preparation method of ultra-high molecular weight polyethylene catalyst
  • Preparation method of ultra-high molecular weight polyethylene catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Main catalyst preparation:

[0053] First replace the 250ml three-neck flask with heating system, stirring device and reflux condensing system with nitrogen for no less than three times, then add 60ml of n-hexane, 1g of anhydrous magnesium chloride, and 5ml of n-butanol to raise the temperature of the system As high as 70°C, and keep reacting at this temperature for 0.5 hours to obtain a magnesium alkoxide compound solution; after cooling to room temperature, slowly add 0.03mol of diethylaluminum chloride and 25ml of toluene dropwise, stir and reflux at 70°C for 0.5 hours; Turn on the ultrasonic device, adjust the frequency to 40KHz, and the power of the device to 50W, and maintain the reaction for 2 minutes. After turning off the ultrasonic device, keep the reaction system at 70°C for 0.5 hours at a constant temperature; after cooling to room temperature, slowly add 4ml of titanium tetrachloride dropwise, and react at a constant temperature of 70°C for 2 hours. Finall...

Embodiment 2

[0057] The catalyst component was prepared in the same manner as in Example 1, but during the preparation of the catalyst, the amount of toluene was changed from 25ml to 15ml. Polymerization was carried out in the same manner as in Example 1 using this catalyst component. The catalyst performance and polymerization product performance are shown in Table 1.

Embodiment 3

[0059] The catalyst component was prepared in the same manner as in Example 1, but during the preparation of the catalyst, the amount of toluene was changed from 25ml to 20ml. Polymerization was carried out in the same manner as in Example 1 using this catalyst component. The catalyst performance and polymerization product performance are shown in Table 1.

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Abstract

The invention relates to a preparation method of an ultrahigh molecular weight polyethylene catalyst, belonging to the technical field of catalyst preparation. The preparation method comprises the steps of preparing a main catalyst and a cocatalyst, wherein the main catalyst is prepared in the following steps of (1) reacting magnesium halide compounds with hydrocarbon solvents; (2) adding alcohol to form an alcohol-magnesium compound with magnesium halide; (3) adding halogenated aluminum alkyl to form an intermediate product with the alcohol-magnesium compound; (4) carrying out ultrasonic treatment on the obtained intermediate product; (5) adding titanium compounds to carry out titanium-carrying reaction; (6) standing, washing and drying solid particles, so as to obtain the ultrahigh molecular weight polyethylene catalyst, wherein aromatic compounds are added in each step. According to the preparation method, by adding the aromatic compounds along with an ultrasonic wave intensifying technique, the catalyst activity can be substantially improved, the catalyst is stable in reaction kinetics, is easily controlled by utilizing a polymerization process, and a polymerization product obtained by utilizing the catalyst has the characteristics of high molecular weight and low bulk density.

Description

technical field [0001] The invention relates to a preparation method of an ultra-high molecular weight polyethylene catalyst, belonging to the technical field of catalyst preparation. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) refers to a linear structure polyethylene with a viscosity average molecular weight of more than 1.5 million. Its average molecular weight is more than ten times that of conventional high-density polyethylene (HDPE). Impact resistance, high wear resistance, high corrosion resistance, self-lubrication, high comprehensive temperature resistance, good noise reduction performance, good stress cracking resistance, and compliance with hygienic standards. Due to its unique performance advantages, UHMWPE is widely used in many fields such as textile, papermaking, transportation, packaging, machinery, chemical industry, mining, petroleum, agriculture, construction, electrical appliances, medical treatment, sports and refrig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F4/649C08F2/56
CPCY02P20/52
Inventor 李晓庆周建勇毕晓龙李文义李留忠于永玲严婕齐立芳李功韬徐晓范大鹏
Owner CHINA PETROLEUM & CHEM CORP
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