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Low-temperature spinning superfine ultra high molecular weight polyethylene (UHMWPE) fiber and preparation method thereof

A technology of ultra-high molecular weight and polyethylene fibers, applied in the field of fiber materials, can solve the problems of low yield of ultra-fine denier fibers, low monofilament linear density, and low strength, and achieve low spinning energy consumption, low solvent residue, Soft and comfortable effect

Active Publication Date: 2020-06-09
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the monofilament linear density and strength are the decisive factors that determine the material texture, feel, etc. Therefore, it is necessary to obtain fibers with as low a monofilament linear density as possible and as high a strength as possible, so that they can be used in soft personal protection and other clothing fields. Widely used and developed; and the two are contradictory, the existing fiber preparation method must sacrifice another performance while improving a certain performance
[0006] The purpose of the present invention is to solve the problems of low yield and low strength of ultrafine denier fiber preparation for the technical blank in the above patents

Method used

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  • Low-temperature spinning superfine ultra high molecular weight polyethylene (UHMWPE) fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mix the UHMWPE resin with a viscosity-average molecular weight of 4.1 million and the solvent decahydronaphthalene at a mass ratio of 1:18. The average particle size of the UHMWPE resin is 200 μm, and the bulk density is 0.4 g / cm 3 , the amount of additives added is 3‰ of UHMWPE resin, and it is prepared into a spinning solution, which is fed into an emulsifier and emulsified step by step, at 70°C, 105°C, and 118°C, and stay for 0.5h in three time periods , 1h, 2h, then lowered to normal temperature, fed into the twin-screw extruder, and set the screw mixing temperature to 190°C. The screw diameter of the twin-screw extruder is 30mm, and the ratio of length to diameter is 72:1. After the twin-screw extruder is swollen, mixed and extruded, it is extruded through a spinneret at 110°C to 160°C, and passed through a high-magnification The nozzle is stretched to form fine fibers, the number of holes selected in the spinneret is 100 holes, the hole diameter is 0.7mm, the aspe...

Embodiment 2

[0035] Mix the UHMWPE resin with a viscosity-average molecular weight of 4.8 million and the solvent tetralin at a mass ratio of 1:17.5. The average particle size of the UHMWPE resin is 210 μm, and the bulk density is 0.45 g / cm 3 , the amount of additives added is 5‰ of UHMWPE resin, prepared into spinning solution, fed the spinning solution into the emulsifier, and emulsified step by step, 70°C, 105°C, 118°C, stay for 0.5h in three time periods , 1h, 2h, then lowered to room temperature, fed into the twin-screw extruder, and set the screw mixing temperature to 170°C. The screw diameter of the twin-screw extruder is 48mm, and the ratio of length to diameter is 60:1. After the twin-screw extruder is swelled, mixed and extruded, it is extruded through the spinneret at 110°C to 160°C, and passed through a high-magnification The nozzle is stretched to form fine fibers, the number of holes selected in the spinneret is 88 holes, the hole diameter is 0.6mm, the aspect ratio is 10:1, ...

Embodiment 3

[0038] Mix the UHMWPE resin with a viscosity-average molecular weight of 6.12 million and the solvent xylene at a mass ratio of 1:24. The average particle size of the UHMWPE resin is 250 μm, and the bulk density is 0.5 g / cm 3 , the amount of additives added is 2‰ of UHMWPE resin, and it is prepared into a spinning solution, which is fed into an emulsifier and emulsified step by step, at 70°C, 105°C, and 118°C, and stay for 0.5h in three time periods , 1h, 2h, then lowered to normal temperature, fed the spinning solution into the twin-screw extruder, and set the screw mixing temperature to 160°C. The screw diameter of the twin-screw extruder is 20mm, and the ratio of length to diameter is 64:1. After the twin-screw extruder is swollen, mixed and extruded, it is extruded through a spinneret at 110°C to 170°C, and passed through a high-magnification The nozzle is stretched to form fine fibers, the number of holes selected in the spinneret is 75 holes, the hole diameter is 0.75mm,...

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Abstract

The invention relates to a low-temperature spinning superfine ultra high molecular weight polyethylene (UHMWPE) fiber and a preparation method thereof. The fiber is fiber multifilament yarn composed of 2-2000 monofilaments. The linear density of the monofilaments in the fiber multifilament yarn is 0.2-0.3 dtex. The mechanical strength of the fiber is 36cN / dtex-42cN / dtex. The preparation method comprises the steps that raw materials including UHMWPE resin, solvents and additives are mixed and prepared into a spinning solution, the spinning solution is subjected to a special pretreatment process, then fed into a twin-screw extruder to be subjected to swelling and mixing and then extruded out, extrusion molding is performed through a spinneret plate, and fine fiber is obtained after stretching is performed through a critical supersprayer; and after the solvents are completely removed from spun filaments, the spun filaments are subjected to multistage hot stretching and winding, and accordingly, a final product is obtained. Compared with the prior art, the fiber multifilament yarn prepared through the preparation method is uniform in filament linear-density and free of fuzziness or broken filaments, the monofilament linear-density is only 0.3-0.5 time that of conventional fiber, the fiber multifilament yarn has a soft and comfortable hand feel, the solvent residual quantity is small, and the spinning temperature in the preparation process is approximately 150 DEG C lower than that of conventional spinning, and the spinning energy consumption is low.

Description

technical field [0001] The invention belongs to the field of fiber materials, and relates to an ultra-high molecular weight polyethylene (UHMWPE) fiber and a preparation method thereof, in particular to a low-temperature spinning ultrafine denier UHMWPE fiber and a preparation method thereof. Background technique [0002] UHMWPE fiber is currently the fiber material with the highest specific strength among the industrialized fiber materials, and it is one of the three high-performance fibers in the world. Thanks to UHMWPE's ultra-high molecular weight and narrow molecular weight distribution, UHMWPE fiber materials have excellent mechanical properties, wear resistance, and chemical corrosion resistance, as well as light weight and high thermal conductivity. It is widely used in aerospace, marine engineering, and civil protection fields. [0003] Ultrafine denier fibers can be woven into high-grade textiles with soft hand feeling and comfortable wearing, which have high econ...

Claims

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Application Information

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IPC IPC(8): D01F6/04D01D5/12D01D1/02
CPCD01F6/04D01D5/12D01D1/02
Inventor 郑晗王新威孙勇飞李济祥巩明方黄周雨
Owner SHANGHAI RES INST OF CHEM IND
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