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Preparation method of high-performance polyethylene fiber

A polyethylene fiber and polyethylene technology, which is applied in the direction of single-component polyolefin artificial filament, textile and papermaking, spinneret assembly, etc., can solve the problems of difficult entanglement, high viscosity, and shortening the dissolution of polyethylene time and other issues, to achieve the effect of solving the difficulty of dissolution, large stretching ratio, and simplifying the process flow

Active Publication Date: 2021-02-09
宁波链增新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inert solvent used for spinning is used as the polymerization solvent. Due to the higher boiling point and higher viscosity, the movement of the polyethylene chains generated during the polymerization process is limited, and it is difficult to form entanglement between chains, so that it can maintain a good initial phase. The ecological chain structure can fundamentally solve the problem of difficult dissolution of polyethylene particles in the gel spinning process, and greatly shorten the time required for polyethylene to dissolve in the solvent

Method used

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  • Preparation method of high-performance polyethylene fiber

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preparation example Construction

[0026] The preparation method of high performance polyethylene fiber of the present invention comprises the following steps:

[0027] The ethylene, inert solvent, polymerization catalyst system and hydrogen are introduced into the polymerization reactor, and the mixed liquid of polyethylene and inert solvent is prepared by slurry polymerization.

[0028] The bubble point of the inert solvent under standard pressure is greater than 100° C., which is alkanes, cycloalkanes, aromatics, or derivatives of alkanes / cycloalkanes / aromatics, or a mixture of any of them. Preferably, the bubble point is greater than 130°C, more preferably greater than 150°C, such as one of high boiling point mineral oil, paraffin oil, kerosene, and decahydronaphthalene.

[0029] The polymerization catalyst system used in the present invention consists of a solid catalyst containing transition metal components and a cocatalyst. The transition metal component includes a metal of Group IVB or VB of the perio...

Embodiment 1

[0052] Continuously introduce ethylene, inert solvent decahydronaphthalene (bubble point 191°C under standard pressure) into a polymerization reactor with a volume of 250L, and introduce a silica-supported titanium-magnesium catalyst together with triethylaluminum, and adopt slurry polymerization Continuous production of polyethylene. The feed rate of the catalyst was 2 g(Ti) / h, and the molar ratio of aluminum in the cocatalyst to titanium in the solid component was 200. The reaction temperature is 60° C., the reaction pressure is 8 bar, the residence time of the reactor is 2.5 h, and the stirring rate is 500 rpm.

[0053] The polyethylene and inert solvent mixture obtained by the reaction were continuously introduced into the dissolution tank, further raised to a dissolution temperature of 150°C under the protection of nitrogen, added decahydronaphthalene and 0.01wt% antioxidant 1010, stirred and dissolved for 5 minutes, and prepared A homogeneous polyethylene spinning solut...

Embodiment 2

[0056] Continuously introduce ethylene, inert solvent mineral oil (bubble point 367°C under standard pressure) into a polymerization reactor with a volume of 250L, and introduce silica-supported titanium-magnesium catalyst together with triethylaluminum, adopt continuous slurry polymerization Prepare polyethylene. The feed rate of the catalyst was 2 g(Ti) / h, and the molar ratio of aluminum in the cocatalyst to titanium in the solid component was 200. The reaction temperature is 60° C., the reaction pressure is 8 bar, the residence time of the reactor is 2.5 h, and the stirring rate is 500 rpm.

[0057] The polyethylene obtained by the reaction and the inert solvent mixture were continuously introduced into the dissolution tank, further raised to the dissolution temperature of 150°C under the protection of nitrogen, the same mineral oil and 0.01wt% antioxidant 1010 were added, and stirred for 5 minutes to dissolve. A homogeneous polyethylene spinning solution was obtained. A ...

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Abstract

The invention discloses a preparation method of a high-performance polyethylene fiber. The preparation method comprises the following steps that polyethylene is prepared by adopting an inert solvent with a bubble point of more than 100 DEG C under standard pressure, polymerizing is carried out to obtain a mixed solution of polyethylene and the inert solvent, the mixed solution is directly used asa production raw material of the polyethylene fiber, a spinning solution is prepared from the mixed solution, the spinning solution is introduced into a screw extruder, the spinning solution is sprayed out from a spinneret orifice after being metered, quenching is carried out in a cold water bath to obtain gel fibers, and then extracting, drying and super-stretching are carried out to obtain the high-performance polyethylene fiber. The inert solvent is high in boiling point and large in viscosity, polyethylene chains generated in the polymerization process are limited in motion, and entanglement is difficult to form between the chains, so that a good initial ecological chain structure is kept, and the problem that polyethylene particles are difficult to dissolve in the gel spinning processis fundamentally solved.

Description

technical field [0001] The invention relates to the field of preparation of polyethylene fibers, in particular, the invention relates to a preparation method of high-performance polyethylene fibers. Background technique [0002] Polyethylene fiber is the third generation of high-performance fiber that appeared in the early 1990s. It has excellent mechanical properties, and also has low density, good weather resistance, chemical corrosion resistance, low temperature resistance, wear resistance, good bending resistance, good cutting resistance, high specific energy absorption, low conductivity, and can penetrate X-rays and certain waterproof properties are widely used in many fields such as national defense military equipment, aerospace, marine engineering, transportation, sports equipment, etc. [0003] The main production method of polyethylene fiber is gel spinning and super-stretching technology, which was first applied for patent by DSM company in the Netherlands. The ma...

Claims

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Application Information

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IPC IPC(8): D01F6/04D01D4/02D01D4/06
CPCD01F6/04D01D4/02D01D4/06
Inventor 张淑文王颂杨陈国旺
Owner 宁波链增新材料科技有限公司
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