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Ultrahigh molecular weight polyethylene resin with high impact strength and preparation method thereof

A polyethylene resin and ultra-high molecular weight technology, which is applied in the field of polymer materials, can solve the problems of reduced room for molecular chain segment activity, increased crystallinity, and reduced impact strength, and achieves excellent mechanical properties and impact resistance.

Active Publication Date: 2016-12-14
上海联乐化工科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the linear structure polyethylene resin produced according to the above method, because the molecular chain becomes longer, the amorphous region decreases and the crystallinity increases, especially for ultra-high molecular weight polyethylene resins with a molecular weight of 6 to 10 million. After the impact, the room for the molecular segment to move is reduced, showing the phenomenon of reduced impact strength
Therefore, the existing ultra-high molecular weight polyethylene resin products cannot meet the needs of fields that require both high wear resistance and high impact resistance.

Method used

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  • Ultrahigh molecular weight polyethylene resin with high impact strength and preparation method thereof
  • Ultrahigh molecular weight polyethylene resin with high impact strength and preparation method thereof
  • Ultrahigh molecular weight polyethylene resin with high impact strength and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add about 3800g of heptane into a 10L polymerization kettle, set the stirring speed of the polymerization kettle to 400r / min, and fully replace it with high-purity nitrogen under stirring. Then the polymerization kettle was heated to about 60°C, and then 80ml of cocatalyst triethylaluminum and 10ml of diphenyldiethoxysilane were added, stirring was continued and the temperature was raised to 65°C, then 245mg of Z-N main catalyst was added, and the speed was increased to 800r / min, continue to add about 10g functional monomer 1-hexene, and then continuously feed ethylene. During the polymerization process, the temperature of the kettle was controlled at 68-70° C., the pressure of the kettle was maintained at 0.4 MPa, and the polymerization time was 2 hours. The obtained material was processed by distillation to remove the heptane to obtain 2.5 kg of the polymer product.

Embodiment 2

[0031] Add about 3800g of heptane into a 10L polymerization kettle, set the stirring speed of the polymerization kettle to 400r / min, and fully replace it with high-purity nitrogen under stirring. Then the polymerization kettle was heated to about 60°C, and then 80ml of cocatalyst triethylaluminum and 10ml of diphenyldiethoxysilane were added, stirring was continued and the temperature was raised to 65°C, then 245mg of Z-N main catalyst was added, and the speed was increased to 800r / min, first continuously feed about 6L propylene, and then continuously feed ethylene. During the polymerization process, the temperature of the kettle was controlled at 68-70° C., the pressure of the kettle was maintained at 0.4 MPa, and the polymerization time was 2.5 hours. The obtained material was processed by distillation to remove the heptane to obtain 3.0 kg of the polymer product.

Embodiment 3

[0033] Add about 3800g of heptane into a 10L polymerization kettle, set the stirring speed of the polymerization kettle to 400r / min, and fully replace it with high-purity nitrogen under stirring. Then the polymerization kettle was heated to about 60°C, and then 85ml of cocatalyst tripropylaluminum and 10ml of diphenyldimethoxysilane were added, and the stirring was continued and the temperature was raised to 65°C, then 260mg of Z-N main catalyst was added, and the speed was increased to 800r / min, first continuously feed about 6L propylene, and then continuously feed ethylene. During the polymerization process, the temperature of the kettle was controlled at 66-68° C., the pressure of the kettle was maintained at 0.4 MPa, and the polymerization time was 3 hours. The obtained material was processed by distillation to remove the heptane to obtain 2.6 kg of the polymer product.

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Abstract

The invention relates to ultrahigh molecular weight polyethylene resin with high impact strength and a preparation method thereof. The polyethylene resin is prepared by continuous copolymerization of a functional monomer and slurry of ethene in a polymerization kettle by using a novel Z-N catalyst; the novel Z-N catalyst is a reaction product of a main catalyst, a cocatalyst and an electron donor compound; wherein the mass ratio between the main catalyst and ethene is 0.5x10<-4>-0.5x10<-3>:1, the mass ratio between of the cocatalyst and ethene is 3.2x10<-2>-3.5x10<-2>:1, and the mass ratio between the functional monomer and ethene is 1.5x10<-3>-4.2x10<-3>:1; during preparation, the catalysts, the electron donor compound and the functional monomer are premixed in the polymerization kettle, ethene is introduced for polymerization in order to prepare the ultrahigh molecular weight polyethylene resin whose viscosity average molecular weight is 6-9 million and impact strength is 140-200KJ / m<2>. Compared with the prior art, the product has the advantages of wear resistance, mechanical property, and excellent shock resistance; the product can be used as a special-purpose material for special wear resistant sheet materials, and can be widely applied to the field of high-speed rails.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a high-impact strength ultra-high molecular weight polyethylene resin and a preparation method thereof. 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. Although its molecular structure arrangement is exactly the same as that of ordinary polyethylene, due to its ultra-high molecular weight, its performance changes suddenly, and it has impact resistance, wear resistance, self-lubrication, chemical corrosion resistance, and stress cracking resistance unmatched by other engineering plastics. High resistance, anti-adhesion and excellent electrical insulation, known as "singular plastic", ultra-high molecular weight polyethylene has been widely used in chemical, petroleum, textile, paper, machinery, mining, food, medical, sports, internat...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F210/02C08F210/06C08F210/14C08F220/14C08F212/12C08F2/06C08F4/646
CPCC08F210/02C08F210/16C08F210/14C08F210/06C08F220/14C08F212/12C08F4/6465C08F2500/01C08F2/06
Inventor 徐绍魁代士维李建龙张炜运新华侯秀红王新威
Owner 上海联乐化工科技有限公司