Method for preparing high-strength polypropylene fibers

A polypropylene fiber and polypropylene technology, applied in the field of spinning, can solve problems such as poor strength of polypropylene fibers, achieve stable cooling conditions, avoid broken wires, and facilitate stretching and traction.

Pending Publication Date: 2020-02-04
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problem of poor strength of polypropylene fibers at the present stage, and provides a preparation method of high-strength polypropylene fibers

Method used

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  • Method for preparing high-strength polypropylene fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put the polypropylene pellets into the hopper of the spinning machine and extrude through the spinneret at 230°C. A water tank is set at a position 8cm directly below the spinneret and between the air cooling device. The length of the water tank is 1.2m, The water temperature is 70°C. After the first step of water cooling is carried out by passing the thin stream of polypropylene melt ejected from the spinneret through the water tank, the second step of annular air cooling is performed on the water-cooled thin stream of polypropylene melt, and the air cooling temperature is 30°C. Apply a softener to the obtained polypropylene fiber after one-step water cooling and two-step air cooling, and wind the fiber obtained by the softener on a roll for 5 turns under the condition that the temperature of the first roll is 65°C, and the speed of the first roll is 180m / min , and then the fiber is wound on the second roll for 8 turns under the condition that the temperature of the se...

Embodiment 2

[0021] In this embodiment, the temperature of the spinneret is 235° C., the temperature of the second roll is 85° C., and the rotational speed of the second roll is 800 m / min.

Embodiment 3

[0023] In this embodiment, the temperature of the spinneret is 230° C., the temperature of the second roll is 85° C., and the rotational speed of the second roll is 820 m / min.

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Abstract

The invention discloses a method for preparing high-strength polypropylene fibers, which comprises the steps of adding polypropylene pellets into a hopper of a spinning machine, and extruding througha spinneret at 230 DEG C, with a water tank having a length of 1.2 m and a water temperature of 70 DEG C and being 8 cm right below the spinneret; subjecting a melt stream sprayed from the spinneret to first-step water cooling in the water tank before second-step annular air cooling at the temperature of 30 DEG C; applying a softening agent to the polypropylene fibers subjected to two-step cooling, winding the obtained fibers on a first roller five times which has the roller temperature of 65 DEG C and the rotating speed of 180 m / min, and winding on a second roller eight times which has the roller temperature of 85 DEG C and the rotating speed of 800 m / min to obtain the polypropylene fibers. The method has the advantages that the elongation at break of the polypropylene fibers can be increased to greater than 249%, the resilience is greater than 115%, the breaking strength is greater than 8.2 cN.dtex<-1>, and the method is suitable for manufacturing high-strength polypropylene fibers.

Description

technical field [0001] The invention relates to the field of spinning, in particular to a method for preparing high-strength polypropylene fibers. Background technique [0002] Polypropylene fiber is widely used in our life, and it is also the lightest synthetic fiber. Polypropylene fiber has good mechanical properties, abrasion resistance and moisture absorption, especially its low price. In addition, polypropylene fiber has excellent chemical resistance, good acid and alkali resistance and insect resistance at room temperature. Therefore, polypropylene fiber is very suitable for use in marine ropes and deep sea operations. The production of traditional polypropylene ropes is to use a spinning machine to extrude through a spinneret, after air cooling, one-stage drafting, two-stage drafting, and finally into filaments. The traditional polypropylene ropes prepared by this method are used in When on a ship operating at sea, the polypropylene rope is often unable to play its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/09D01D5/088D01D5/16D06M13/224D06M13/463D01F6/06D06M101/20
CPCD01D1/09D01D5/088D01D5/0885D01D5/16D01F6/06D06M13/2243D06M13/463D06M2101/20D06M2200/50
Inventor 武卫莉李响李超王旭
Owner QIQIHAR UNIVERSITY
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