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Composite of polyethylene with low viscosity ultra high moleculer weight and preparation process thereof

An ultra-high molecular weight, polyethylene technology, which is applied in the field of low-viscosity ultra-high molecular weight polyethylene composition and its preparation, can solve the problems of great decline in mechanical properties of blends, large addition amount, limited use, etc., and achieves improved processing. Effects of rheology, viscosity reduction, critical shear rate improvement

Inactive Publication Date: 2005-01-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the addition of medium and low molecular weight polyethylene is relatively large (more than 30%), and the mechanical properties of the blend are greatly reduced compared with ultra-high molecular weight polyethylene, which limits the use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: First, 100 g of polyethylene glycol with a molecular weight of 2000 and 200 g of diatomite with an average particle size of 0.2 μm were added to a high-speed mixer, sealed, stirred at a high speed at a temperature of 80 ° C for 5 minutes, and discharged after cooling to obtain Composite auxiliary agent PPA1, then the molecular weight is 250 ± 500,000 ultra-high molecular weight polyethylene 80g and the polypropylene (F401) 20g of MI=2.2g / 10min, calcium stearate 1.0g, tetrakis [β-(3,5 -Di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester 0.3g and compounding auxiliary agent PPA1 1g were mixed uniformly, and were extruded with twin-screw to granulate. The extrusion temperature from the feed inlet to the outlet is 1 stage: room temperature -190°C, 2 stages: 180°C-220°C, 3 stages: 180°C-230°C, 4 stages: 180°C-220°C. The properties of the obtained pellets are shown in Table 1.

Embodiment 2

[0030] Embodiment 2: Change the content of the composite auxiliary agent PPA1 to 3g, and the remaining components and operating conditions in the formula are the same as in Example 1. The results are shown in Table 1.

Embodiment 3

[0031] Embodiment 3: Change the content of the composite auxiliary agent PPA1 to 6g, and the remaining components and operating conditions in the formula are the same as in Example 1. The results are shown in Table 1.

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PUM

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Abstract

The invention is a low-viscosity ultrahigh molecular weight polyethylene combination and its preparing method, and its character: adding ultrahigh molecular weight polyethylene 70-90 weight shares, polypropylene 30-10 weight shares, antioxidant 0.03-0.8 weight share, lubricant 0.2-2.0 weight shares and compound assistant 1-15 weight shares in a high-speed mixer to mix at a high speed for 2-5 minutes, mixing uniformly and then making particles by a double-screw extruder, and the extruding temperature is 180 deg.C-230 deg.C. The viscosity of the combination is reduced remarkably, the critical cutting speed is increased, and the combination can be processed into products by general die forming, extrusion molding and injection molding, the synthetic properties are good and especially, the shock-resistant property does not change.

Description

1. Technical field [0001] The invention relates to a low-viscosity ultra-high molecular weight polyethylene composition and a preparation method thereof, belonging to the processing field of polymer materials. 2. Background technology [0002] Ultra-high molecular weight polyethylene generally refers to linear polyethylene with a viscosity average molecular weight of more than 1.5 million, which has excellent wear resistance, impact resistance, self-lubrication, corrosion resistance, dimensional stability and low temperature stress cracking resistance. Its comprehensive performance can be applied in many fields such as textile, paper making, grain processing, chemical industry, medical treatment, sports and military affairs. However, due to the extremely high molecular weight of ultra-high molecular weight polyethylene and the highly random entanglement between macromolecular chains, its melt viscosity is extremely high (about 10 9 Pa.s) and the critical shear rate is extre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/40C08K5/523C08L23/06
Inventor 李惠林谢美菊刘小龙刘功德
Owner SICHUAN UNIV
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