Catalytic system for producing ultrahigh molecular weight polyethylene

An ultra-high molecular weight, catalytic system technology, applied in the field of catalytic systems, can solve the problems of cumbersome catalyst preparation, failure to provide the average particle size of polymer particles, and no practical value.

Active Publication Date: 2008-08-20
BEIJING JINDINGKE CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN1189486C provides a catalytic system for preparing UHMWPE with high bulk density and good particle shape. The catalyst prepares magnesium-aluminum solution in the presence of alcohol through magnesium halide and aluminum compound, and then adds titanium compound and silicon compound to prepare the catalyst, the preparation of this catalyst is also very cumbersome, and it takes two times of titanium loading to complete the preparation
[0005] CN1034509C provides a kind of preparation method of UHMWPE of high bulk density, and this catalyst is prepared catalyst by Ti (IV) compound is treated with alkylaluminum and reduces Ti, althou

Method used

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  • Catalytic system for producing ultrahigh molecular weight polyethylene
  • Catalytic system for producing ultrahigh molecular weight polyethylene
  • Catalytic system for producing ultrahigh molecular weight polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 prepares catalyst active component

[0055] Put 4.76 grams (0.05mol) of MgCl 2 , 100 mL of decane and 26 mL of isooctyl alcohol (0.167 mol), heated to 130 ° C for 180 minutes, cooled to 65 ° C, added 15 mmol of dipropyldimethoxysilane electron donor at this temperature, and continued to react for 60 minutes. After cooling to room temperature. Slowly add 50 mL of TiCl dropwise over 90 minutes at 0°C 4 In the mixed solution, keep the temperature at 0°C for 60 minutes after the dropwise addition, then add 25mL chlorocyclohexane and slowly raise the temperature to 110°C over 120 minutes, add 2.5mmol of the same silane electron donor at this temperature, continue After reacting for 120 minutes, a solid catalyst was obtained. After the stirring was stopped, it was found that the solid catalyst particles settled very fast. After the reaction was finished, the solid catalyst was filtered out with heat. Wash with hexane, 40 mL each time, until the filtrate is ba...

Embodiment 2～50

[0057] The solid catalyst component was prepared in the same manner as in Example 1 except that the amount and composition of the electron donor used were shown in Table 1.

[0058] Table 1

[0059]

[0060]

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PUM

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Abstract

The invention provides a catalyst system used for preparing ultra-high molecular weight polyethylene. According to the invention, the catalyst system comprises active ingredients, outer electron donors and catalyst promoters; wherein, the total weight of active ingredients of the catalyst based on 100 parts by weight comprises 12.0 to 18.0 parts by weight of magnesium, 4.0 to 8.0 parts by weight of titanium, 1.1 to 11.0 parts by weight of alkoxy group and 55.0 to 75.0 parts by weight of halogens by weight. The method for preparing the active ingredients comprises the steps that: serous fluid of magnesium-alcohol complex is prepared, the serous fluid reacts with the electron donor of (R)nSi, pre-loading titanium reacts with loading titanium. The ultra-high molecular weight polyethylene is prepared by adopting the synergistic effect of the active ingredients, R <1> R <11> Si (OR <111>) <2> and the organoaluminium compound R 3-n ALX n of the invention. The catalyst system of the invention has the advantages of high bulk density, excellent dynamic stability, and the ultra-high molecular weight polyethylene prepared has the advantages of good product form, mean particle distribution and high bulk density; the molecular weight can be adjusted between 2 million and 7 million.

Description

technical field [0001] The invention relates to a catalytic system for the preparation of ultra-high molecular weight polyethylene (UHMWPE). Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a polyethylene resin with a molecular weight of 1.5 million to 6 million. Because it has a larger molecular weight than ordinary polyethylene, UHMWPE has excellent properties such as impact resistance, wear resistance, self-lubrication, low temperature resistance, and chemical corrosion resistance, and is widely used in machinery, transportation, papermaking, mining, electric power , agriculture, chemical industry, and aviation and other fields. In addition, one of the most important application areas of UHMWPE is ultra-strong polyethylene fiber, which can be used for cables, fishing nets and bulletproof military equipment. To prepare ultra-strong polyethylene fibers, UHMWPE has special requirements. In addition to having a molecular weight higher than ...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F4/645
Inventor 徐江
Owner BEIJING JINDINGKE CHEM TECH
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