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Preparation method of low-entanglement and ultrahigh-molecular-weight polyethylene powder and plate material thereof

A technology of ultra-high molecular weight polyethylene powder, which is applied in the field of olefin polymerization reaction process and polymer material molding process, can solve the problems of low polymerization efficiency, not used to manufacture UHMWPE sheet, poor process economy, etc., and achieve excellent processing performance , The effect of inhibiting the chain growth rate and improving the tensile strength

Active Publication Date: 2015-06-24
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the polymerization mechanism of the catalyst is "active" polymerization, the molecular weight of the product increases with the prolongation of the polymerization time, the polymerization efficiency is too low, and the process economy is poor, so it is impossible to realize large-scale production on the existing equipment
In addition, the UHMWPE prepared by this method has not been used to make UHMWPE sheets

Method used

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  • Preparation method of low-entanglement and ultrahigh-molecular-weight polyethylene powder and plate material thereof
  • Preparation method of low-entanglement and ultrahigh-molecular-weight polyethylene powder and plate material thereof
  • Preparation method of low-entanglement and ultrahigh-molecular-weight polyethylene powder and plate material thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A method for preparing ultra-high molecular weight polyethylene powder with low entanglement, comprising the steps of:

[0033] 1) Preparation of substrate catalyst A: shake the acetylacetonate compound and pyridinediimine ligand in a molar ratio of 1:1 in toluene solution, and press the weight of the metal atom in the acetylacetonate compound and the carrier ZSM-41 mesoporous molecular sieve Weigh the carrier ZSM-41 mesoporous molecular sieve at a ratio of 0.5 wt%, and add it to the toluene solution and stir for 1 hour to obtain solid particles; wash the solid particles with toluene solution for 5 times, then dry the solid particles to a free-flowing state to obtain the base catalyst A;

[0034] 2) Preparation of low-entanglement ultra-high molecular weight polyethylene catalyst A: the polymer is weighed according to 6% of the weight of the ZSM-41 mesoporous molecular sieve, and the polymer is dissolved in a good solvent of the polymer to prepare The homogeneous polym...

Embodiment 2

[0047] A method for preparing ultra-high molecular weight polyethylene powder with a low degree of entanglement, characterized in that it has the following steps:

[0048] 1) Preparation of substrate catalyst A: Shake the acetylacetonate compound and pyridinediimine ligand in a molar ratio of 3:1 in toluene solution, and press the metal atom in the acetylacetonate compound and the carrier ZSM-41 mesoporous molecular sieve by weight Weigh the carrier ZSM-41 mesoporous molecular sieve at a ratio of 2 wt%, and add it to the toluene solution and stir for 4 hours to obtain solid particles; wash the solid particles with toluene solution for 5 times, and then dry the solid particles to a free-flowing state to obtain the base catalyst A ;

[0049] 2) Preparation of low-entanglement ultra-high molecular weight polyethylene catalyst A: the polymer is weighed according to 30% of the weight of the ZSM-41 mesoporous molecular sieve, and the polymer is dissolved in a good solvent for the po...

Embodiment 3

[0061] A method for preparing ultra-high molecular weight polyethylene powder with low entanglement, comprising the steps of:

[0062] 1) Preparation of substrate catalyst A: Shake the acetylacetonate compound and pyridinediimine ligand in a toluene solution at a molar ratio of 2:1, and mix the metal atoms in the acetylacetonate compound with the carrier ZSM-41 mesoporous molecular sieve by weight Weigh the carrier ZSM-41 mesoporous molecular sieve at a ratio of 1.52 wt%, and add it to the toluene solution and stir for 2 hours to obtain solid particles; wash the solid particles with toluene solution for 3 times, then dry the solid particles to a free-flowing state to obtain the base catalyst A;

[0063] 2) Preparation of low-entanglement ultra-high molecular weight polyethylene catalyst A: the polymer is weighed according to 20% of the weight of the ZSM-41 mesoporous molecular sieve, and the polymer is dissolved in a good solvent of the polymer , be prepared into a homogeneou...

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Abstract

The invention relates to a preparation method of low-entanglement and ultrahigh-molecular-weight polyethylene powder and a plate material thereof. The preparation method comprises the following steps: loading an acetylacetone salt compound and a bis(imino)pyridyl ligand main catalyst on a mesoporous molecular sieve ZSM-41, and depositing a layer of polymer film on the ZSM-41 so as to obtain a low-entanglement and ultrahigh-molecular-weight polyethylene heterogeneous catalyst. Vinyl polymerization is carried out at 10-50 DEG C; in a process of polymerizing the catalyst, a grown polyethylene segment is low in possibility of being entangled, so that the obtained UHMWPE powder is low in entanglement; a UHMWPE plate material can be prepared by processing the UHMWPE powder at a temperature (50-120 DEG C) which is not greater than the melting temperature, and the plate material is relatively high in tensile strength and elongation at break.

Description

technical field [0001] The invention relates to an olefin polymerization reaction process and a polymer material forming process, in particular to a preparation method of a low-entanglement ultra-high molecular weight polyethylene powder and a plate thereof. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) has the characteristics of high strength, low density, good weather resistance, chemical corrosion resistance, low temperature resistance, wear resistance, bending resistance, good cutting resistance, and high specific energy absorption. are widely used in Wehrmacht Equipment, aerospace, marine engineering, safety protection, sports equipment and many other fields. Industrially, the production of UHMWPE is mostly carried out in slurry polymerization using supported Ziegler-Natta catalysts. Although the catalyst activity is high, the active sites of the catalyst are mostly dispersed in MgCl 2 On the carrier, the distance is very close, and t...

Claims

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Application Information

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IPC IPC(8): C08F110/02C08F4/70C08L23/06C08J5/18
Inventor 历伟陈鹏陈涛杨华琴
Owner NINGBO UNIV
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