Antistatic filter cloth and manufacturing method thereof

Abstract

The invention relates to antistatic filter cloth and a manufacturing method thereof. The manufacturing method comprises the following steps: step 1, preparing antistatic base cloth: blending polyphenylene sulfide yarns and antistatic yarns to prepare the antistatic base cloth; 2, blending polyphenylene sulfide fibers and stainless steel fibers to prepare a fiber surface layer and a fiber bottom layer; 3, the fiber surface layer, the anti-static base cloth and the fiber bottom layer are sequentially stacked and placed from top to bottom, and 4, the contact faces of the fiber surface layer, the anti-static base cloth and the fiber bottom layer are wound and hooked up and down through multiple times of reciprocating puncture; 5, the needled filter cloth is subjected to calendering, singeing, high-temperature setting and nano antistatic agent dipping treatment, and the antistatic filter cloth is formed. The invention also discloses the antistatic filter cloth obtained by the preparation method. The traditional antistatic filter bag made of a single material is changed, the performance complementation of all the materials is exerted, the temperature resistance and acid and alkali resistance of the antistatic filter bag are improved, the coal dust loss is reduced, and meanwhile, the environmental dust pollution is reduced.

Description

Technical Field

[0001] The invention relates to an antistatic filter cloth and a manufacturing method thereof, in particular to a filter cloth for an antistatic filter bag of a coal powder collector in the coal chemical industry and a manufacturing method thereof, belonging to the technical field of dust removal filter materials. Background Art

[0002] Antistatic filter bags are functional filter bags developed in the field of industrial dust removal for working conditions where static electricity is generated. The material used to make antistatic filter bags is antistatic filter cloth.

[0003] In many industrial production processes, such as chemical, metallurgical, electric power, cement and other industries, a large amount of dust will be generated. These dusts will not only pollute the environment and harm human health, but also may affect the normal operation of production equipment. Therefore, effective dust control is a problem that must be solved in industrial production. Bag dust collectors have become one of the important equipment for industrial dust control with their high dust removal efficiency, stable performance and wide applicability.

[0004] In some specific industrial production environments, dust is prone to static electricity during the generation, transportation and filtration process. For example, when dust particles rub against each other, rub against the surface of equipment or are washed by airflow, it will cause the transfer and accumulation of charges, generating static electricity. In addition, some raw materials used in the production process have certain conductivity or electrostatic properties, which will also increase the possibility of static electricity generation.

[0005] The presence of static electricity can cause many problems in the operation of bag filters. On the one hand, static electricity can make dust adhere more firmly to the surface of the filter bag, increase the difficulty of dust removal, increase the resistance of the filter bag, and reduce the filtration efficiency and processing capacity of the dust collector. On the other hand, when static electricity accumulates to a certain extent, it may cause spark discharge, thereby igniting the surrounding flammable and explosive gases or dust, causing serious safety accidents.

[0006] In order to solve the problem of static electricity in industrial dust treatment, antistatic filter bags came into being. By adding conductive fibers to the material of the filter bag or using a special surface treatment process, the filter bag has good conductivity, which can timely remove the accumulated static electricity and avoid the accumulation of static electricity, thereby ensuring the safe and efficient operation of the bag dust collector.

[0007] In order to meet the needs of coal chemical bases and expand the application market of filter bags, it is necessary to change the previous use of only a single material, increase the service life of antistatic filter bags for coal powder collectors, extend the maintenance and replacement cycle of filter bags, reduce the dust emission concentration of coal powder collectors, and avoid static sparks causing coal powder combustion or explosion. It is necessary to develop new antistatic filter cloths and their production methods. Summary of the invention

[0008] In order to solve the above problems, the present invention discloses an antistatic filter cloth and a manufacturing method thereof, and the specific technical scheme thereof is as follows:

[0009] A method for preparing an antistatic filter cloth comprises the following steps:

[0010] Step 1: preparing an antistatic base fabric (20): weaving polyphenylene sulfide fibers into polyphenylene sulfide yarns (201); weaving stainless steel fibers into antistatic yarns (202); blending polyphenylene sulfide yarns (201) and antistatic yarns (202) into an antistatic base fabric (20);

[0011] Step 2: preparing a fiber surface layer (301) and a fiber bottom layer (302): the fiber surface layer (301) and the fiber bottom layer (302) are both blended from polyphenylene sulfide fibers and stainless steel fibers;

[0012] Step 3: Stacking: stacking the fiber surface layer (301), the antistatic base fabric (20), and the fiber bottom layer (302) from top to bottom.

[0013] Step 4: Puncture: Puncture reciprocatingly through a multi-channel needle punching machine (40) so that the contact surfaces of the fiber surface layer (301), the antistatic base fabric (20), and the fiber bottom layer (302) are intertwined and connected up and down;

[0014] Step 5: After needle punching, the filter cloth needs to be calendered, singed, high-temperature set, and impregnated with nano antistatic agent to form an antistatic filter cloth.

[0015] Furthermore, in the step 1, polyphenylene sulfide fibers with a diameter in the range of 5.5 μm to 10 μm are selected, and the polyphenylene sulfide fibers are opened, cleaned, and combed, and the spinning speed is 2000 to 4000 m / min by means of a ring spinning process to spin polyphenylene sulfide yarn (201), and the twist of the polyphenylene sulfide yarn (201) is 300 to 600 T / M;

[0016] The antistatic yarn (202) is spun by using stainless steel fiber with a diameter of 5 to 15 μm and air-spinning technology, with the air pressure set to 0.4 to 0.8 MPa. The twist of the antistatic yarn (202) is 180 to 240 twists / meter.

[0017] Furthermore, the blending mass ratio of the polyphenylene sulfide yarn (201) and the antistatic yarn (202) is 7:3;

[0018] The antistatic base fabric (20) has a gram weight of 450-600 g / m 2 .

[0019] Furthermore, the stainless steel fiber is made of 316L stainless steel, has a fiber diameter of 12 μm, a temperature resistance of 650° C., and a melting point of 1350° C.

[0020] Furthermore, the polyphenylene sulfide yarn (201) is blended with one antistatic yarn (202) at intervals of 10 mm.

[0021] Furthermore, in step 2, the fiber surface layer (301) and the fiber bottom layer (302) are both blended by polyphenylene sulfide fiber and stainless steel fiber in a mass ratio of 9:1.

[0022] Furthermore, the needles (401) of the acupuncture machine (40) are in the shape of a triangular rhombus, and each rhombus has three grooves.

[0023] Furthermore, the impregnation liquid in step 5 is a mixed solution of polytetrafluoroethylene and graphene, the mass ratio of polytetrafluoroethylene to graphene is 3:1 to 10:1, and the immersion time is 30 to 60 minutes, so as to improve the electrostatic charge conduction rate.

[0024] Furthermore, in step 5, the filter cloth after needle punching is first calendered, the calendering temperature is set to below 130°C, the pressure is set to 10-30N / mm, and the surface roughness of the filter cloth after calendering reaches 3μm to ensure that the surface of the filter cloth is flat and smooth.

[0025] Then the filter cloth is singed at a speed of 30-40 m / min and a flame temperature of 900-1000°C. After the singeing treatment, the remaining length of the fluff on the filter cloth surface does not exceed 1.5 mm, and the fluff on the filter cloth surface is removed.

[0026] Then, high-temperature shaping is carried out, and the temperature is maintained below 130°C for 15 to 30 seconds to stabilize the size and structure of the filter cloth.

[0027] Finally, after the filter cloth is impregnated, take it out and dry it at 110°C for 3 to 5 minutes.

[0028] The present invention also applies for protection of an antistatic filter cloth prepared by the above-mentioned preparation method of the antistatic filter cloth.

[0029] The beneficial effects of the present invention are:

[0030] The filter bag prepared by the method of the present invention has improved antistatic performance, rapid electrostatic charge conduction, and charges will not accumulate in large quantities to generate sparks to ignite coal powder. The safety factor of the coal powder collector is improved, which effectively guarantees safe production. Nano antistatic agent impregnation can improve the smoothness of the filter bag surface, reduce coal powder accumulation on the filter bag surface, reduce the heat accumulation effect of coal powder electrostatic smoldering, effectively reduce the high-temperature carbonization phenomenon of the filter material, and effectively extend the service life of the filter bag.

[0031] The present invention changes the previous single-material antistatic filter bag, makes use of the complementary properties of various materials, improves the heat resistance and acid and alkali resistance of the antistatic filter bag, reduces coal powder loss, and reduces environmental dust pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention,

[0033] Figure 2 is a schematic cross-sectional structure diagram of the present invention,

[0034] List of reference numerals: 10 - antistatic filter cloth, 20 - antistatic base cloth, 201 - polyphenylene sulfide yarn, 202 - antistatic yarn, 301 - fiber surface layer, 302 - fiber bottom layer.

[0035] Figure 3 It is a diagram of the method for making antistatic filter cloth (needle punching) shown in the present invention. DETAILED DESCRIPTION

[0036] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0037] Combined with Figures 1-2 It can be seen that the structure of the antistatic filter cloth 10 prepared by the present invention is: a fiber surface layer 301, an antistatic base cloth 20 and a fiber bottom layer 302, the antistatic base cloth 20 is sandwiched between the fiber surface layer 301 and the fiber bottom layer 302, the fiber surface layer 301, the antistatic base cloth 20, and the fiber bottom layer 302 are reciprocatedly punctured by needles, and the adjacent contact surfaces of the fiber surface layer 301, the antistatic base cloth 20, and the fiber bottom layer 302 are entangled and connected up and down, which plays a good role in the connection stability between the multiple layers and avoids stratification during use.

[0038] The preparation method of the antistatic filter cloth of the present invention is specifically described below, comprising the following steps:

[0039] Step 1: Prepare antistatic base fabric 20: Use polyphenylene sulfide fiber to weave polyphenylene sulfide yarn 201, specifically: select polyphenylene sulfide fiber with a diameter in the range of 5.5μm to 10μm, and use ring spinning technology to spin polyphenylene sulfide yarn 201 at a spinning speed of 2000 to 4000m / min through opening, impurity removal, and combing. The twist of polyphenylene sulfide yarn 201 is 300 to 600T / M. Use stainless steel fiber to weave antistatic yarn 202, specifically: Use stainless steel fiber with a diameter of 5μm to 15μm, use air-spinning technology, set the air pressure to 0.4 to 0.8MPa, and spin antistatic yarn 202. The twist of antistatic yarn 202 is 180 to 240 twists / meter. The mass ratio of the polyphenylene sulfide yarn 201 to the antistatic yarn 202 is 7:3, and the polyphenylene sulfide yarn 201 is blended with one antistatic yarn 202 every 10 mm to form the antistatic base fabric 20. The antistatic base fabric 20 has a weight of 450-600 g / m 2 .

[0040] As a specific choice of the stainless steel fiber of the present invention: 316L stainless steel is selected, the fiber diameter is 12 μm, the temperature resistance is 650° C., and the melting point is 1350° C.

[0041] Step 2: Prepare the fiber surface layer 301 and the fiber bottom layer 302: The fiber surface layer 301 and the fiber bottom layer 302 are both blended by polyphenylene sulfide fiber and stainless steel fiber in a mass ratio of 9:1. The selection of polyphenylene sulfide fiber and stainless steel fiber is the same as in step 1.

[0042] Step 3: Stacking: Stack the fiber surface layer 301, the antistatic base fabric 20, and the fiber bottom layer 302 from top to bottom.

[0043] Step 4: Puncture: The fiber surface layer 301, the antistatic base fabric 20, and the fiber bottom layer 302 are intertwined and connected at the contact surface by a multi-channel needle-punching machine; the needles of the needle-punching machine are in the shape of a rhombus, and each rhombus has three grooves.

[0044] Step 5: The filter cloth after needle punching is subjected to calendering, singeing, high temperature setting, and nano antistatic agent impregnation treatment to form an antistatic filter cloth 10. The specific process is: the filter cloth after needle punching is first calendered, the calendering temperature is set to below 130°C, the pressure is set to 10-30N / mm, and the surface roughness of the filter cloth after calendering reaches 3μm to ensure that the surface of the filter cloth is flat and smooth.

[0045] Then the filter cloth is singed at a speed of 30-40 m / min and a flame temperature of 900-1000°C. After the singeing treatment, the remaining length of the fluff on the filter cloth surface does not exceed 1.5 mm, and the fluff on the filter cloth surface is removed.

[0046] Then, high-temperature shaping is carried out, and the temperature is maintained below 130°C for 15 to 30 seconds to stabilize the size and structure of the filter cloth.

[0047] The impregnation liquid is a mixed solution of polytetrafluoroethylene and graphene, the mass ratio of polytetrafluoroethylene to graphene is 3:1 to 10:1, and the impregnation time is 30 to 60 minutes to improve the electrostatic charge conduction rate. Finally, after the filter cloth is impregnated, it is taken out and dried at a temperature of 110° C. for 3 to 5 minutes to prepare an antistatic filter cloth 10.

[0048] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0049] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing an antistatic filter cloth, characterized in that: The following steps are involved: Step 1: preparing an antistatic base fabric (20): weaving polyphenylene sulfide fibers into polyphenylene sulfide yarns (201); weaving stainless steel fibers into antistatic yarns (202); blending polyphenylene sulfide yarns (201) and antistatic yarns (202) into an antistatic base fabric (20); Step 2: preparing a fiber surface layer (301) and a fiber bottom layer (302): the fiber surface layer (301) and the fiber bottom layer (302) are both blended from polyphenylene sulfide fibers and stainless steel fibers; Step 3: Stacking: stacking the fiber surface layer (301), the antistatic base fabric (20), and the fiber bottom layer (302) from top to bottom. Step 4: Puncture: Puncture reciprocatingly through a multi-channel needle punching machine (40) so that the fiber surface layer (301), the antistatic base fabric (20), and the fiber bottom layer (302) are intertwined and connected at the contact surface; Step 5: After needle punching, the filter cloth needs to be calendered, singed, high-temperature set, and impregnated with nano antistatic agent to form an antistatic filter cloth.

2. The method for preparing the antistatic filter cloth according to claim 1, characterized in that: In the step 1, polyphenylene sulfide fibers with a diameter in the range of 5.5 μm to 10 μm are selected, and the polyphenylene sulfide fibers are opened, cleaned, and combed, and the spinning speed is 2000 to 4000 m / min by ring spinning process to spin polyphenylene sulfide yarn (201), and the twist of the polyphenylene sulfide yarn (201) is 300 to 600 T / M; The antistatic yarn (202) is spun by using stainless steel fiber with a diameter of 5 to 15 μm and air-spinning technology, with the air pressure set to 0.4 to 0.8 MPa. The twist of the antistatic yarn (202) is 180 to 240 twists / meter.

3. The method for preparing the antistatic filter cloth according to claim 1, characterized in that: The blending weight ratio of the polyphenylene sulfide yarn (201) and the antistatic yarn (202) is 7:3; The antistatic base fabric (20) has a gram weight of 450-600 g / m 2 .

4. The method for preparing the antistatic filter cloth according to claim 1, characterized in that: The stainless steel fiber is made of 316L stainless steel, has a fiber diameter of 12 μm, a temperature resistance of 650° C., and a melting point of 1350° C.

5. The method for preparing the antistatic filter cloth according to claim 1, characterized in that: The polyphenylene sulfide yarn (201) is blended with one antistatic yarn (202) at intervals of 10 mm.

6. The method for preparing the antistatic filter cloth according to claim 1, characterized in that: In the step 2, the fiber surface layer (301) and the fiber bottom layer (302) are both blended by polyphenylene sulfide fiber and stainless steel fiber in a mass ratio of 9:

1.

7. The method for preparing the antistatic filter cloth according to claim 1, characterized in that: The needles (401) of the needle loom (40) are in the shape of a triangular rhombus, with three grooves on each rhombus.

8. The method for preparing the antistatic filter cloth according to claim 1, characterized in that: The impregnation liquid in step 5 is a mixed solution of polytetrafluoroethylene and graphene, the mass ratio of polytetrafluoroethylene to graphene is 3:1 to 10:1, and the immersion time is 30 to 60 minutes to improve the electrostatic charge conduction rate.

9. The method for preparing the antistatic filter cloth according to claim 1, characterized in that: In the step 5, the filter cloth after needle punching is first calendered, the calendering temperature is set to below 130° C., the pressure is set to 10-30 N / mm, and the surface roughness of the filter cloth after calendering reaches 3 μm. Then the filter cloth is subjected to a singeing treatment, the singeing speed is 30-40 m / min, the flame temperature is maintained at 900-1000°C, and the residual length of the fluff on the filter cloth surface after the singeing treatment does not exceed 1.5 mm. Then, high temperature setting is carried out in an environment below 130°C for 15 to 30 seconds. Finally, after the filter cloth is impregnated, take it out and dry it at 110°C for 3 to 5 minutes.

10. An antistatic filter cloth prepared by the method for preparing an antistatic filter cloth according to any one of claims 1 to 9.

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