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Ultrahigh molecular polyethylene catalyst and preparation method

An ultra-high molecular weight and catalyst technology, applied in the field of polymers, can solve problems such as undiscovered preparation processes, and achieve the effects of easy polymerization control, promotion and improvement, and easy preparation methods

Active Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There is no report in the existing literature that ultrasonic waves are applied to the preparation process of ultra-high molecular weight polyethylene catalysts, thereby improving the activity of the catalyst and the molecular weight of the polymer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Catalyst preparation

[0052] First replace the 250ml three-necked flask equipped with a heating system with a stirring device and a reflux condensing system with nitrogen for no less than three times, then add 60ml of n-hexane, 1mol 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 30ml of diethylaluminum chloride dropwise, stir and reflux at 70°C for 0.5 hours; turn on the ultrasonic device, Adjust the frequency to 40KHz, the device power 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. Finally, the stirring w...

Embodiment 2

[0056] The catalyst component was prepared in the same manner as in Example 1, but during the preparation of the catalyst, the ultrasonic treatment time was changed from 2 minutes to 1 minute. Polymerization was carried out in the same manner as in Example 1 using this catalyst component. The results are shown in Table 1.

Embodiment 3

[0058] The catalyst component was prepared in the same manner as in Example 1, but during the preparation of the catalyst, the ultrasonic treatment time was changed from 2 minutes to 5 minutes. Polymerization was carried out in the same manner as in Example 1 using this catalyst component. The results are shown in Table 1.

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Abstract

The invention relates to a preparation method of an ultrahigh molecular polyethylene catalyst, which belongs to the high-molecular technical field. The method comprises the following steps: 1) under the protection of nitrogen, magnesium halide and a hydrocarbon solvent are reacted; 2) alcohol is added and forms an alcohol magnesium compound with magnesium halide; 3) halogenated alkyl aluminum and the alcohol magnesium compound form an intermediate product; 4) a supersonic wave device is switched on for performing ultrasonic treatment; 5) titanium tetrachloride is added and stirred for backflow under the heating condition; and 6) a standing process is carried out, the solid particles are washed and dried to obtain the ultrahigh molecular polyethylene catalyst. The obtained catalyst and cocatalyst alkyl aluminum are used together for synthesis of the ultrahigh molecular polyethylene. According to the invention, the ultrasonic treatment technology is used in the preparation process of the catalyst, the activity of the ultrahigh molecular polyethylene catalyst can be enhanced, the molecular weight of the polymerization products can be increased, the polymerization kinetics of the prepared catalyst is stable, and the polymerization technology can be easily controlled.

Description

technical field [0001] The invention relates to an ultra-high molecular weight polyethylene catalyst and a preparation method thereof, belonging to the technical field of polymers. 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. Because the molecular weight of UHMWPE is as high as one million or even several million, it has excellent impact resistance, self-lubrication, chemical corrosion resistance, stress crack resistance, electrical insulation, wear resistance and other properties. Due to its unique performance advantages, UHMWPE is widely used in textiles, papermaking (water-absorbing box cover), transportation (lining of vehicles and ship warehouses), packaging (barrels for sulfuric acid), machinery (rails, star wheels, ground meat, etc.) Machine parts), chemical industry (pump body, valve body), mining, petroleum, agriculture, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/645
Inventor 周建勇李晓庆毕晓龙李留忠于永玲严婕齐立芳李功韬范大鹏徐晓裴晓静
Owner CHINA PETROLEUM & CHEM CORP
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