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

An ultra-high molecular weight polyethylene technology, which is 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: 2005-01-26
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

[0035] Process parameters

[0036] Reaction: The dispersion medium is hexane oil (boiling range 55~80℃) produced by Qilu Petrochemical Company; catalyst: co-catalyst=1:10 (w / w); catalyst--TiCl 4 ; Co-catalyst - triethyl aluminum; polymerization temperature 90 ~ 95 ℃; polymerization pressure 2.5 ~ 3.0Mpa;

[0037] After-treatment: after the reaction, washed with hexane oil, polymerized product: hexane oil = 1:1 (w / w); washing times 1 time; drying vacuum degree 53.3-66.6Kpa, temperature 100-120 ℃; water washing, polymerization Product: washing water = 1:1-5 (w / w); washing times 1 time; drying temperature 100-120°C.

[0038] Specific operation: add 600ml of hexane oil to a 1-liter jacketed stainless steel reactor, stir and heat up to 70°C, add 50mg of triethylaluminum, and add TiCl after 5 minutes 4 5 mg, 5 minutes later, ethylene was introduced to keep its partial pressure at 2.5-3.0 MPa, the polymerization temperature was controlled at 90-95 °C, the material was discharged a...

Embodiment 2

[0051] Example 2 Reaction: n-hexane is selected as dispersing medium; catalyst: co-catalyst=1:10 (w / w); catalyst--TiBr 4 ;Cocatalyst--triisobutylaluminum; Polymerization temperature 40~50℃; Polymerization pressure 2.5~3.0Mpa;

[0052] After-treatment: after the reaction, washed with n-hexane, polymerized product: n-hexane = 1:1 (w / w); washing times 2 times; drying vacuum degree 66.6~79.9Kpa, temperature 100~120 ℃; water washing, polymerized product: Washing water=1:10~15(w / w); washing times 2 times; drying temperature 100~120℃.

[0053] Product test results: mass, 194g; molecular weight, 2.5 million; tensile strength, 31Mpa; elongation at break, 475%; Izod (notch) impact strength, 140kJ / m 2 Abrasion strength (sand abrasion), 31 mg; melt flow rate 10 mg / 10 min.

[0054] The rest are the same as in Example 1.

Embodiment 3

[0055] Example 3 Reaction: Isohexane is selected as the dispersing medium; catalyst: co-catalyst=1:2 (w / w); catalyst--Ti(OCH 3 )Cl 3 ;Cocatalyst--diethylaluminum chloride;polymerization temperature 70~75℃;polymerization pressure 2.0~2.5Mpa;

[0056] After-treatment: after the reaction is completed, washed with isohexane, polymerized product: isohexane=1:2 (w / w); washing times 2 times; drying vacuum degree 66.6~79.9Kpa, temperature 100~120 ℃; water washing, polymerized product: Washing water=1:10~15(w / w); washing times 2 times; drying temperature 100~120℃.

[0057] Product test results: mass, 170g; molecular weight, 2.6 million; tensile strength, 29Mpa; elongation at break, 575%; Izod (notch) impact strength, 155kJ / m 2 ; Abrasion strength (sand abrasion), 40mg; Melt flow rate 25mg / 10min.

[0058] The rest are the same as in Example 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 macromolecular compounds, in particular to a preparation method of ultra-high molecular weight polyethylene with good flow rate and processing performance and a post-treatment process thereof. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a thermoplastic engineering plastic with a relative molecular mass of more than 1.5 million. The material has excellent comprehensive properties, wear resistance, low temperature resistance, corrosion resistance, self-lubrication, and impact resistance are the highest among all plastics, and the wear resistance is better than that of PTFE, nylon, carbon steel and other materials. Working under the conditions of -169~+80℃, it is called "amazing" engineering plastics and can be widely used in metallurgy, electric power, petroleum, textile, papermaking, food, chemical, machinery, electrical and other industries. Compared with metal mate...

Claims

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Application Information

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IPC IPC(8): C08F2/06C08F4/602C08F110/02
Inventor 于勇
Owner 于勇
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