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Super high molecular weight polyethylene preparation method and its post-treatment process

An ultra-high molecular weight, polyethylene technology, applied in the field of ultra-high molecular weight polyethylene preparation, can solve the problems of large amount of modifier and affect the application performance of ultra-high molecular weight polyethylene, and achieve excellent mechanical properties, good flow rate and The effect of processability

Inactive Publication Date: 2007-02-21
于勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above modification technology is at the cost of sacrificing the excellent performance of ultra-high molecular weight polyethylene, and the amount of modifier is large, which affects the excellent application performance of ultra-high molecular weight polyethylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Process parameters

[0037] Reaction: The dispersion medium is hexane oil produced by Qilu Petrochemical Company (boiling range 55-80°C); catalyst: cocatalyst = 1:10 (w / w); catalyst——TiCl 4 ; Cocatalyst - triethyl aluminum; polymerization temperature 90 ~ 95 ℃; polymerization pressure 2.5 ~ 3.0Mpa;

[0038] Post-treatment: After the reaction is completed, wash with hexane oil, polymerize product: hexane oil=1:1 (w / w); washing times 1 time; dry vacuum 53.3-66.6Kpa, temperature 100-120°C; wash with water, polymerize Product: washing water = 1: 1~5 (w / w); washing times 1 time; drying temperature 100~120°C.

[0039] Specific operation: Add 600ml of hexane oil into a 1-liter jacketed stainless steel reaction kettle, stir and heat up to 70°C, add 50mg of triethylaluminum, and add TiCl after 5 minutes 4 After 5 minutes, feed ethylene and keep the partial pressure at 2.5-3.0MPa, control the polymerization reaction temperature at 90-95°C, discharge the material after 5 hours ...

Embodiment 2

[0053] Example 2 Reaction: the dispersion medium is selected from n-hexane; catalyst: co-catalyst = 1: 10 (w / w); catalyst - TiBr 4 ; Cocatalyst - triisobutyl aluminum; polymerization temperature 40 ~ 50 ℃; polymerization pressure 2.5 ~ 3.0Mpa;

[0054] Post-processing: after the reaction is completed, wash with n-hexane, polymerized product: n-hexane=1:1 (w / w); washing times 2 times; drying vacuum 66.6~79.9Kpa, temperature 100~120°C; washed with water, polymerized product: Washing water = 1:10~15 (w / w); washing times 2 times; drying temperature 100~120°C.

[0055] Product testing results: mass, 194g; molecular weight, 2.5 million; tensile strength, 31Mpa; elongation at break, 475%; Izod (notched) impact strength, 140kJ / m 2 ; Abrasion strength (sand abrasion), 31mg; Melt flow rate 10mg / 10min.

[0056] All the other are with embodiment 1.

Embodiment 3

[0057] Embodiment 3 reaction: dispersion medium selects isohexane; Catalyst: cocatalyst=1: 2 (w / w); Catalyst——Ti(OCH 3 ) Cl 3 ; Cocatalyst - diethyl aluminum chloride; polymerization temperature 70 ~ 75 ℃; polymerization pressure 2.0 ~ 2.5Mpa;

[0058] Post-processing: after the reaction is completed, wash with isohexane, polymerized product: isohexane=1:2 (w / w); wash times 2 times; dry vacuum 66.6~79.9Kpa, temperature 100~120°C; wash with water, polymerized product: Washing water = 1:10~15 (w / w); washing times 2 times; drying temperature 100~120°C.

[0059] Product testing results: mass, 170g; molecular weight, 2.6 million; tensile strength, 29Mpa; elongation at break, 575%; Izod (notched) impact strength, 155kJ / m 2 ; Abrasion strength (sand abrasion), 40mg; Melt flow rate 25mg / 10min.

[0060] All the other are with embodiment 1.

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Abstract

The invention relates to a super high molecular weight polyethylene preparation method and its post-treatment process by using hydrocarbons solvent as scattering medium, titanium compound as catalyst, organo-aluminium compound as catalyst promoter, thus obtaining super high molecular weight polyethene, wherein the dispersant alkyl hydrocarbons can be normal hexane, isobutene, hexylene, the titanium compound in the catalyst can be one or mixture of more than one of TiBr4, Ti(OCH3)Cl3, Ti(OCH3)Cl2, Ti(OCH3)4.

Description

technical field [0001] The invention relates to the technical field of polymer compounds, in particular to a preparation method and post-treatment process of an ultra-high molecular weight polyethylene with good flow rate and processing performance. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE for short) is a thermoplastic engineering plastic with a relative molecular weight of more than 1.5 million. The material has excellent comprehensive performance, wear resistance, low temperature resistance, corrosion resistance, self-lubrication, and impact resistance are the highest among all plastics, and its wear resistance is better than polytetrafluoroethylene, nylon, carbon steel and other materials, and can be used for a long time Working under the condition of -169~+80℃, it is called "amazing" engineering plastic, and can be widely used in metallurgy, electric power, petroleum, textile, papermaking, food, chemical industry, machinery, electric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F4/602C08F2/06
Inventor 于勇
Owner 于勇
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