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Polyphenylene sulfide short fiber, its production method and filter felt containing it

A technology for polyphenylene sulfide and a production method, applied in the field of polyphenylene sulfide short fibers, can solve the problems of high cost, poor uniformity, uneven mixing of thick and thin heat-resistant fibers, etc., so as to reduce energy consumption and cost, and reduce processing procedures. , the effect of excellent filtering effect

Active Publication Date: 2020-07-17
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is necessary to produce a thick and fine mixed filter felt, it needs to be uniformly mixed with coarse fibers in the post-processing cotton mixing stage. This method has poor mixing uniformity, and the final filter felt not only has poor filtering effect. , and the cost is also high
[0004] Another example is that the Chinese published patent CN102335533A discloses a filter material and its application. The filter surface layer of the filter material is composed of heat-resistant fibers containing 10-90 wt% of the average diameter below 10 μm and containing 10-90 wt% of the average diameter of 10 μm or less. ~ 20μm heat-resistant fiber mixed fiber web, the filter performance of the filter material is indeed good, and the pressure loss can also be kept small, but because the filter material is mixed with heat-resistant fibers of fineness and fineness in the opening stage , resulting in inhomogeneous mixing of thick and thin heat-resistant fibers, which will eventually lead to limitations in the uniformity of the filter material

Method used

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  • Polyphenylene sulfide short fiber, its production method and filter felt containing it
  • Polyphenylene sulfide short fiber, its production method and filter felt containing it
  • Polyphenylene sulfide short fiber, its production method and filter felt containing it

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A spinneret with a diameter ratio of large holes to small holes of 3.0 is used on the spinneret, and then melted and spit out at 320 degrees. The number of holes and the number of coarse holes are the same, and the ratio of the number of fine holes to coarse holes is 60:40, and then suction is carried out, and a 2-stage stretching method is adopted. The stretching ratio is 3.25 times, and then the temperature is 180 ° C. Heat-setting, crimping, drying, cutting, and finally making two kinds of round PPS short fibers with a mixture of thickness and fineness. The average strength of the PPS short fibers is 3.7cN / dtex, and the number of fine PPS short fibers with a fineness of 0.5dtex The ratio accounts for 60%, and the ratio of the number of coarse PPS short fibers with a fineness of 1.75dtex accounts for 40%. The number of 0.5dtex fine PPS short fibers in any adjacent 100 PPS short fibers is 50 to 70. The PPS short fibers obtained above were opened-carded-laid, and then 8...

Embodiment 2

[0038] A spinneret with a diameter ratio of large holes and small holes of 4.0 is used on the spinneret, and then melted and spit out at 320 degrees. The number of holes and the number of coarse holes are the same respectively, and the ratio of the number of fine holes to coarse holes is 60:40, and then suction is carried out, and a 2-stage stretching method is adopted. The stretching ratio is 3.1 times, and the temperature is 180 ° C. Heat-setting, crimping, drying, cutting, and finally made into two kinds of round PPS short fibers with a mixed thickness The ratio accounts for 60%, and the ratio of the number of coarse PPS short fibers with a fineness of 2.2dtex accounts for 40%. The number of 0.5dtex fine PPS short fibers in any adjacent 100 PPS short fibers is 55 to 65. The other processes are the same as those in Example 1. The physical properties of the PPS short fibers of the present invention and the filter felt containing them are shown in Table 1.

Embodiment 3

[0040] A spinneret with a diameter ratio of large holes to small holes of 5 is used on the spinneret, and then melted and spit out at 320 degrees. The number of holes and the number of coarse holes are the same respectively, and the ratio of the number of fine holes to coarse holes is 60:40, and then suction is carried out, and a 3-stage stretching method is adopted, and the stretching ratio is 3.1 times, and then the temperature is 180 ℃. Heat-setting, crimping, drying, cutting, and finally making two kinds of round PPS short fibers mixed with thickness and fineness. The average strength of the PPS short fibers is 3.9cN / dtex, and the number of fine-fine PPS short fibers with a fineness of 0.5dtex The ratio accounts for 60%, and the ratio of the number of coarse PPS short fibers with a fineness of 3.0 dtex accounts for 40%. The number of 0.5 dtex fine PPS short fibers in any adjacent 100 PPS short fibers is 55 to 62. The other processes are the same as those in Example 1. The ...

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Abstract

The invention discloses polyphenylene sulfide short fibers, a production method thereof and filter felt containing the same. The polyphenylene sulfide short fibers are formed by 0.5-1.25 dtex fine-denier polyphenylene sulfide short fibers and 1.75-3.0 dtex coarse-denier polyphenylene sulfide short fibers, and 30-90 fine-denier polyphenylene sulfide short fibers exist among any 100 adjacent polyphenylene sulfide short fibers. The polyphenylene sulfide short fibers have the advantage of uniform dispersion. The filter felt made from the polyphenylene sulfide short fibers has a better filter effect while the pressure loss of the filter felt is maintained, for example, the collection efficiency exceeds 99.995%; moreover, processing procedures are reduced, and energy consumption and cost are lowered. After being sewn into a bag shape, the filter felt is suitable for being used as a bag filter for collecting dust in exhaust of a coal boiler, a garbage incinerator and the like.

Description

technical field [0001] The present invention relates to a polyphenylene sulfide short fiber, a production method thereof and a filter felt containing the same. Background technique [0002] In most cities in China, it has become an indisputable fact that the concentration of PM2.5 in the atmosphere exceeds the standard. This will become one of the environmental problems that need to be solved urgently. For this reason, the country has promulgated a series of environmental policies. Since 2013, various provinces have gradually adopted stricter requirements for emissions, 20mg / m 3 The following emissions present the requirements of popularization. However, due to the harsh application environment of the filter material (high exhaust gas temperature, SO 2 , high NOx content), the filter material life is facing a severe test. As a chemical fiber with excellent chemical resistance and high temperature resistance, PPS is widely used in boiler discharge filtration. At present, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D13/00D01F6/76D01D5/253B01D39/02
Inventor 张磊
Owner TORAY FIBER RES INST(CHINA) CO LTD