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Process for the preparation of an uhmwpe homopolymer

A technology of ethylene homopolymer and prepolymer, which is applied in strips, a two-step method for manufacturing UHMW polyethylene homopolymer, and the field of products including UHMW polyethylene homopolymer, which can solve the problem of sacrificial polymer yield, low position point density etc.

Active Publication Date: 2021-04-09
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concept is to keep catalyst particles as far away from each other as possible to avoid molecular chain entanglement, and this requires low site density, possibly at the expense of polymer yield

Method used

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  • Process for the preparation of an uhmwpe homopolymer
  • Process for the preparation of an uhmwpe homopolymer
  • Process for the preparation of an uhmwpe homopolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0185] Catalyst Preparation – ZN1

[0186] Complex preparation:

[0187] 87 kg of toluene were added to the reactor. Then 45.5 kg of Bomag A (butyl octyl magnesium) in heptane was also added to the reactor. Then 161 kg of 99.8% 2-ethyl-1-hexanol were introduced into the reactor at a flow rate of 24-40 kg / h. The molar ratio of BOMAG-A to 2-ethyl-1-hexanol is 1:1.83.

[0188] Solid catalyst component preparation:

[0189] 330kg of silica (calcined silica, 2100) and pentane (0.12 kg / kg carrier) were added to the catalyst preparation reactor. EADC (ethylaluminum dichloride) (2.66 mol / kg silica) was then added to the reactor over two hours at a temperature below 40°C and mixing continued for one hour. The temperature during mixing was 40-50°C. The Mg complex prepared as described above (2.56 mol Mg / kg silica) was then added at 50°C within two hours and mixing was continued for one hour at 40-50°C. 0.84 kg pentane per kg silica was added to the reactor and the slurry was...

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Abstract

A process for the preparation of an ultra-high molecular weight ethylene homopolymer having a MFR21 of 0.01 g / 10min or less, said process comprising: (I) prepolymerising at least ethylene at a temperature of 0 to 90 DEG C in the presence of a heterogeneous Ziegler Natta catalyst to prepare an ethylene prepolymer having an Mw of 40,000 to 600,000 g / mol; and thereafter in the presence of the prepolymer and said catalyst; (II) polymerising ethylene at a temperature of 55 DEG C or less, such as 20 to 55 DEG C, to prepare said UHMW ethylene homopolymer; wherein the UHMW ethylene homopolymer comprises up to 8 wt.% of said prepolymer.

Description

technical field [0001] The present invention relates to ultrahigh molecular weight (UHMW) polyethylene homopolymers. In particular, the present invention relates to a two-step process for the manufacture of UHMW polyethylene homopolymers which can be processed in the solid state into elongated objects. The method requires a prepolymerization step followed by a low temperature main polymerization step. The invention also relates to articles, preferably tapes, comprising UHMW polyethylene homopolymer. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) has a very high molecular weight (typically Mw > 1 million) and therefore has excellent physical and chemical properties, such as high abrasion resistance, high impact toughness, excellent resistance to corrosion and chemical degradation , Anti-cyclical fatigue and anti-radiation. [0003] However, increased molecular weight adversely affects the processability of polymers due to the increased n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/655C08F4/654C08F4/02
CPCC08F110/02C08F4/6492C08F4/025C08F4/6546C08F4/6555C08F4/6465C08F2500/07C08F2500/20C08F2500/34C08F2500/01C08F2500/12C08F2500/26C08F2500/35C08L23/06C08L2203/16C08L2207/068C08F2/001C08L2314/02
Inventor I·萨伊德E·科科M·萨罗S·拉斯托基D·罗曼诺S·罗卡
Owner BOREALIS AG