Polyphenylene sulfide short fiber and method for making the same

A technology of polyphenylene sulfide and manufacturing method, applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, melt spinning method, etc., can solve the problems of filter cloth strength reduction, etc., to prolong product life, chemical resistance excellent effect

Inactive Publication Date: 2012-08-01
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there is a literature pointing out that the filter cloth used for the bag filter can be used under severe conditions, and when used for a long time, the strength of the filter cloth will be reduced due to chemical deterioration at high temperature (Patent Document 8)
That is, in order to suppress the decrease in filter cloth strength due to long-term use, it is required that PPS fibers are not prone to decrease in tensile strength over time due to chemical deterioration at high temperatures. However, the current situation is that in the above-mentioned existing In the technology, the decrease in tensile strength over time due to chemical deterioration at high temperature has not been sufficiently suppressed

Method used

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  • Polyphenylene sulfide short fiber and method for making the same
  • Polyphenylene sulfide short fiber and method for making the same
  • Polyphenylene sulfide short fiber and method for making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] With a twin-shaft extruder with vents (TEX30 type manufactured by Nippon Steel Works), the vacuum degree was set to 1.3 kPa, the cylinder temperature was set to 290 ° C, and the screw rotation speed was 160 rpm. PPS powder E2280 (weight-average molecular weight: 49,500) produced by Li Co., Ltd. was melted, extruded from a circular hole (hole area: 15.9 mm 2 ), and cut into a length of 3 mm with a stranding machine to obtain pellets. The obtained particles were vacuum-dried at 160° C. and a vacuum degree of 1.3 kPa for 10 hours. It should be noted that the vacuum drying is carried out in batches, and the dried particles are 2 tons each time.

[0075] The vacuum-dried pellets were melt-spun at a spinning temperature of 320° C. and a discharge rate of 400 g / min using an extruder-type spinning machine, and pulled at a pulling speed of 1000 m / min to obtain undrawn yarns. The natural draw ratio of the obtained undrawn yarn was 2.6 times. Next, the obtained undrawn yarn was ...

Embodiment 2～4、 comparative example 4、5

[0084] Except that the degree of vacuum when obtaining the particles or the reduced-pressure drying temperature and time of the particles were changed as described in Table 1, the same operation as in Example 1 was performed to obtain PPS short fibers and obtain a filter material at the same time. The measurement results of the fineness, tensile strength, crimp elastic modulus and the content of high boiling point volatile components in the obtained PPS short fibers and the measurement results of the pulse jet durability and filter material strength retention rate of the obtained filter material and The experimental conditions are shown in Table 3 together.

experiment example 5

[0086] With a twin-shaft extruder with vents (TEX30 type manufactured by Nippon Steel Works), the vacuum degree was set to 1.3 kPa, the cylinder temperature was set to 290 ° C, and the screw rotation speed was 160 rpm. The pPS powder E2280 (weight-average molecular weight: 49,500) manufactured by Rei Co., Ltd. is melted, and the circular hole (hole area: 15.9mm) 2 ) was extruded and cut into a length of 3 mm using a stranding machine to obtain pellets. The obtained particles were vacuum-dried at 160° C. and a vacuum degree of 1.3 kPa for 10 hours. It should be noted that the vacuum drying is carried out in batches, and the dried particles are 2 tons each time.

[0087] The vacuum-dried pellets were melt-spun at a spinning temperature of 320° C. and a discharge rate of 350 g / min using an extruder-type spinning machine, and pulled at a pulling speed of 800 m / min to obtain undrawn yarns. The natural draw ratio of the obtained undrawn yarn was 2.8 times. Next, the obtained undr...

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Abstract

The invention relates to polyphenylene sulfide short fiber and a method for making the same, with the tensile strength thereof beyond 5cN / dtex and bending modulus of elasticity over 75%. The polyphenylene sulfide short fiber can be obtained by the steps of: fusing polyphenylene sulfide powder under the conditions of decompression and at a temperature less than 350 DEG C; drying the granulated particles under a temperature ranging from 130 to 170 DEG C for fusing; spinning out from a spinning nozzle; and cutting it into regulated length after stretching; collecting the fused polyphenylene spun out from the spinning nozzle without stretching for thermal stretching of over 3 times while less than four times; conducting thermal treatment at a temperature over 180 DEG C for over 4 seconds; endowing crimp to it in a curving box filled with steam of over 180 DEG C and cutting it into regulated length; and conducting loosing treatment before and after the thermal processing with regulated length, thus to making the loosing rate thereof ranging from 1% to 6% during the period after thermal stretching and before curving.

Description

[0001] The present invention application is a divisional application of the invention patent application with the application number 200810095121.3 and the invention title "polyphenylene sulfide short fiber and its manufacturing method". technical field [0002] The present invention relates to a polyphenylene sulfide staple fiber excellent in tensile strength and a method for producing the same, and more specifically, to a polyphenylene sulfide staple fiber excellent in tensile strength with little decrease in the breaking strength of the fiber even under long-term heat treatment Polyphenylene sulfide staple fiber and its manufacturing method. Background technique [0003] Polyphenylene sulfide (hereinafter referred to as PPS) resin has excellent heat resistance, shielding properties, chemical resistance, electrical insulation, moisture resistance and other properties suitable for engineering plastics, and can be used for injection molding and extrusion molding. Various ele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/76D01D5/08D01D5/12D01D10/02D02J1/22D02G1/00
Inventor 吉田哲弘中野享传地多弘幸
Owner TORAY IND INC
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