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Catalyst precursor and catalyst for preparing superfine polyethylene with ultra high molecular weight

An ultra-high molecular weight, catalyst technology, applied in the field of ethylene catalysts, can solve the problems of low catalytic activity, no average particle size of polymer particles, cumbersome catalyst preparation, etc., to reduce the preparation steps of catalysts, reduce catalyst costs, stack The effect of increased density

Pending Publication Date: 2018-09-28
CHINA CHEM TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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
[0006] CN1746197A provides a catalytic system for preparing UHMWPE with a high bulk density. This catalyst adopts the preparation of a carrier first and then carries titanium to form a catalyst. It can be seen that its catalyst preparation is relatively cumbersome
Although the prepared UHMWPE has a relatively high molecular weight, the average particle size of the polymer particles is not provided, and the catalytic activity is not very high. The catalytic activity is only about 30,000 times when the polymerization time is 4 hours.

Method used

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  • Catalyst precursor and catalyst for preparing superfine polyethylene with ultra high molecular weight
  • Catalyst precursor and catalyst for preparing superfine polyethylene with ultra high molecular weight
  • Catalyst precursor and catalyst for preparing superfine polyethylene with ultra high molecular weight

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0030] Preparation Example 1 Preparation of Catalyst Active Components

[0031] (1) 10.0 grams of active magnesium chloride carriers of different particle sizes through airflow classification are placed in the reaction flask, and the particle size of the magnesium chloride selected is 2 μm and the specific surface area is 110m 2 / g, the pore volume is 71mL / g, or the particle size is 5μm, and the specific surface area is 97m 2 / g, the pore volume is 67mL / g, or the particle size is 10μm, and the specific surface area is 75m 2 / g, the pore volume is 45mL / g.

[0032] (2) Under the protection of inert gas, add 100mL of n-hexane, and add 6.0mL of isooctyl alcohol, 3.3mL of kinetic control agent γ-chloropropyltrimethoxysilane and 3.3mL of γ-chloropropyltrimethoxysilane to the suspension in sequence. Ethoxysilane, heated to 50°C, reacted for 1 hour.

[0033] (3) Cool down to 10°C, then slowly add 0.46mol titanium tetrachloride dropwise while stirring. After the dropwise addition, r...

preparation Embodiment 2

[0035] Same as Preparation Example 1, except that after adding the kinetic control agent, 10 mL of toluene solution containing 10.0 mmol of [O,O] and [O,N] morphology modifiers was added dropwise. The morphology modifiers used in each preparation example and the Ti content and Mg content measurement results of the prepared catalyst precursor are shown in Table 1.

[0036] Table 1

[0037]

[0038]

[0039]

preparation Embodiment 15

[0041] Except that in step (2), the reaction temperature is 20° C., and the reaction time is 2 hours; the reaction temperature is 90° C., and the reaction time is 0.5 hour, the others are the same as Preparation Example 1.

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Abstract

The invention relates to the field of ethylene catalysts, and particularly relates to a catalyst precursor and a catalyst for preparing superfine polyethylene with an ultra high molecular weight. According to the invention, magnesium chloride which is the by-product for producing organic silicon compounds is utilized as a raw material to prepare the active component of the catalyst, the strength of catalyst particles is increased, the fluidity of the prepared polyethylene is good, the bulk density is obviously increased, the particle shape is greatly improved, the cost of the catalyst is reduced at the same time, and the production is greener and more environmentally friendly.

Description

technical field [0001] The invention relates to the field of ethylene catalysts, in particular to a catalyst precursor and a catalyst for preparing ultrafine ultrahigh molecular weight polyethylene. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a polyethylene resin with a molecular weight of 1.5 million to 8 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, there are currently two most important application areas for UHMWPE, one is super strong polyethylene fiber, which can be used for cables, fishing nets and bulletproof military equipment. The other is the lithium battery separator. To prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/646C08F110/02
CPCC08F110/02C08F4/6465
Inventor 许学翔李岭
Owner CHINA CHEM TECH RES INST