CN109011841B - Preparation method of high-stability dedusting filter material - Google Patents

Preparation method of high-stability dedusting filter material Download PDF

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CN109011841B
CN109011841B CN201810933313.0A CN201810933313A CN109011841B CN 109011841 B CN109011841 B CN 109011841B CN 201810933313 A CN201810933313 A CN 201810933313A CN 109011841 B CN109011841 B CN 109011841B
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polyacrylonitrile
fiber layer
later use
fiber
coarse
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CN109011841A (en
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张海涛
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Anhui Honglu filter material Co., Ltd
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Anhui Honglu Filter Material Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2055—Carbonaceous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0636—Two or more types of fibres present in the filter material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing

Abstract

The invention discloses a preparation method of a high-stability dedusting filter material, which comprises the following steps: (1) preparing a surface fiber layer A, (2) selecting base cloth, (3) preparing a bottom fiber layer B, and (4) preparing a finished product filter material. The invention carries out special processing treatment on the dedusting filter material, optimizes and improves the raw material composition and structure, obviously improves the temperature resistance, strength, impact resistance, filtering efficiency and effect of the filter material, and the stability and service life of the filter material, and has great market competitiveness and production and use values.

Description

Preparation method of high-stability dedusting filter material
Technical Field
The invention belongs to the technical field of environment-friendly materials, and particularly relates to a preparation method of a high-stability dedusting filter material.
Background
Currently, the economy of China enters a high-speed development stage, and the heavy industry mainly based on resource and energy consumption develops rapidly. The rapid development of the industries brings economic development to the society and also brings serious environmental pollution problems, and the problems are mainly reflected in the emission of high-temperature smoke, smoke dust particulate matters and other atmospheric pollutants.
The bag type dust collector is one of high temperature fume purifying and filtering equipment, and can eliminate dust effectively and catch dust of different nature to improve environment effectively. The filter material is a key material of the bag-type dust collector, common high-temperature dust-collecting filter materials in the market at present comprise polyphenylene sulfide (PPS) fiber needled felt, polyimide (P84) fiber needled felt, Polytetrafluoroethylene (PTFE) fiber needled felt, glass fiber filter materials and the like, but the high-temperature dust-collecting filter materials can not continuously work at the temperature of more than 300 ℃.
In order for filter materials to continue to operate in higher temperature operating environments, many studies and experiments have been recently conducted, such as: chinese patent CN201110199266.X discloses a composite filter material for a high-temperature flue gas bag type dust removal system and a preparation method thereof, the composite filter material is characterized in that a dust facing surface formed by polysulfonamide and aramid fiber mixed fibers is arranged on the upper surface of a base cloth woven by polysulfonamide and aramid fiber mixed yarns, a bottom layer formed by polysulfonamide and aramid fiber mixed fibers is arranged on the lower surface of the base cloth, and the dust facing surface, the base cloth and the bottom layer are combined and needled to form the composite filter material so as to improve the high-temperature resistance of the composite filter material, but the filter material can only continuously work at the temperature of 240-280 ℃, and the performances of the filter material and the like can not meet the technical requirements of people which are increasingly improved.
Disclosure of Invention
The invention aims to provide a preparation method of a high-stability dedusting filter material aiming at the existing problems.
The invention is realized by the following technical scheme:
a preparation method of a high-stability dedusting filter material comprises the following steps:
(1) preparation of the surface fiber layer A:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is 1.8-2.0 dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber is 0.32-0.38 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is 2.4-2.6 dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.42-0.48 mm;
c. opening, mixing, carding and lapping the crude polyacrylonitrile preoxidized fiber to prepare a crude polyacrylonitrile preoxidized fiber layer for later use; the specification of the crude polyacrylonitrile fiber is 3.2-3.4 dtex multiplied by 60mm, and the thickness of the crude polyacrylonitrile fiber is 0.52-0.58 mm;
d. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a, the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation b and the coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation c up and down in sequence, and performing needling process to obtain a surface fiber layer A for later use;
(2) selecting base cloth:
selecting a low-density aramid woven fabric as a base fabric, wherein aramid used by the low-density aramid woven fabric is a low-density aramid woven fabric 1313, the warp and weft densities of the low-density aramid woven fabric are the same and are both 35-40 tex, and the warp density and the weft density are also the same and are both 60-70 pieces/10 cm;
(3) preparing a bottom fiber layer B:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is 1.8-2.0 dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber is 0.32-0.38 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is 2.4-2.6 dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.42-0.48 mm;
c. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a and the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation B up and down, and performing needling process treatment to obtain a bottom fiber layer B for later use;
(4) preparing a finished product filter material:
and (3) sequentially arranging the surface fiber layer A prepared in the step (1), the base cloth selected in the step (2) and the bottom fiber layer B prepared in the step (3) from top to bottom, and then performing water needling process treatment to obtain the finished product filter material.
Further, the preparation method of the modified polyacrylonitrile pre-oxidized fiber comprises the following steps:
1) mixing potassium permanganate, succinic acid and ionic liquid according to a weight ratio of 3-5: 1-2: 500-550, putting the mixture into a stirring tank, continuously stirring for 5-10 min, adding polyacrylonitrile powder with the mass being 2-3 times of the total mass of the polyacrylonitrile powder into the stirring tank, and continuously stirring for 10-15 min to obtain a mixture A for later use; the ionic liquid is disubstituted imidazole type ionic liquid;
2) the preparation method comprises the following steps of (1) mixing a multi-walled carbon nanotube, fatty alcohol-polyoxyethylene ether and deionized water in a weight ratio of 1: 7-9: 100-110, mixing, putting into a stirring tank, and performing ultrasonic treatment for 1-2 hours by using ultrasonic waves with the frequency of 300-350 kHz to obtain a mixed solution B for later use;
3) pouring the mixed solution B obtained in the step 2) onto a polytetrafluoroethylene filter membrane, carrying out suction filtration by using a suction filtration device in an environment of 520-540 kPa to obtain a multi-walled carbon nanotube film, then repeatedly washing the prepared multi-walled carbon nanotube film by using deionized water and methanol until the washing solution is colorless, taking out the multi-walled carbon nanotube film, putting the multi-walled carbon nanotube film into a vacuum drying oven at the temperature of 90-94 ℃ for drying treatment, and taking out the multi-walled carbon nanotube film for later use after 8-10 hours;
4) putting the multi-walled carbon nanotube film treated in the step 3) into an irradiation box for He ion irradiation treatment, and taking out for later use after the He ion irradiation treatment is finished;
5) mixing zinc acetate dihydrate and N, N-dimethylformamide according to a weight ratio of 1: 5-7, putting the mixture into a stirring tank, stirring at a high speed of 1200-1400 rpm for 40-50 min, and taking out to obtain a mixed solution C for later use;
6) putting the mixed liquid C obtained in the step 5) into a reaction kettle, adding absolute ethyl alcohol accounting for 38-42% of the total volume of the mixed liquid C into the reaction kettle, stirring at the rotating speed of 600-700 rpm for 30-35 min, adding polyvinylpyrrolidone accounting for 17-19% of the total mass of the mixed liquid C and butyl titanate accounting for 19-22% of the total mass of the mixed liquid C into the reaction kettle, performing ultrasonic treatment for 2-2.5 h by using ultrasonic waves with the frequency of 520-550 kHz, and taking out the treated mixed liquid C to obtain a mixed liquid D for later use;
7) immersing the multiwalled carbon nanotube film treated in the step 4) into the mixed solution D prepared in the step 6), heating to keep the temperature of the mixed solution D at 40-46 ℃, continuously performing ultrasonic treatment for 2-3 h, then performing high-speed centrifugal treatment, washing a centrifugate once with deionized water, finally putting the centrifugate into an oxygen-free environment at the temperature of 300-330 ℃, performing heat preservation and drying treatment for 3-5 h, and taking out to obtain a composite additive for later use;
8) mixing the mixture A obtained in the step 1) and the composite additive obtained in the step 7) according to a weight ratio of 100: 6-9, putting the mixture A and the composite additive into a double-screw spinning machine for melt spinning treatment, simultaneously introducing oxygen into a melting section of the double-screw spinning machine, controlling the flow of introducing the oxygen to be 3-5 ml/min, and finally extruding to prepare semi-finished filaments for later use;
9) and (3) directly carrying out dry heat stretching on the semi-finished yarn prepared in the step 8), controlling the stretching temperature to be 120-130 ℃, controlling the total stretching multiple to be 5-6 times, cleaning and cooling the stretched fiber by using hot water at the temperature of 60-65 ℃, and finally putting the fiber into hot air at the temperature of 155-165 ℃ for heat setting treatment.
Further, the irradiation energy is controlled to be 330-350 keV, the irradiation temperature is controlled to be 460-480 ℃, and the injection amount is 2-4 multiplied by 10 during He ion irradiation treatment in the step 4)16cm-2。
Further, the rotating speed of the screws in the double-screw spinning machine in the step 8) is 80-100 revolutions per minute, the temperature of the feeding section is controlled to be 174-178 ℃, the temperature of the plasticizing section is controlled to be 188-192 ℃, and the temperature of the melting section is controlled to be 210-214 ℃.
Further, the needling process adopted in the step (1) and the step (3) has a needling model number of 25, a needling depth of 4-6 mm, a needling frequency of 660-680 times/min, a needle density of 1400-1500 pieces/m and an output speed of 2.2-2.4 m/min.
Further, 8 spunlace heads are adopted in the spunlace process treatment in the step (4), and the spunlace pressure is controlled to be 70-80 Bar.
The invention carries out special improvement treatment on the preparation method of the dedusting filter material, wherein a specially prepared surface fiber layer A and a specially prepared bottom fiber layer B are respectively arranged on the upper surface and the lower surface of a base fabric, the two fiber layers are both woven by a modified polyacrylonitrile preoxidation fiber material according to different modes, and the mode of using the polyacrylonitrile preoxidation fiber material is also seen in the existing filter material, because the polyacrylonitrile preoxidation fiber material has excellent high temperature resistance, but the shearing strength is poor, the processing difficulty is high, the application in the field of high-temperature bag type dedusting filter materials is still slow, and the industrial production is not formed yet. The prior polyacrylonitrile preoxidation fiber for preparing the high-temperature-resistant bag-type dust removal filter material has the following problems: 1. the polyacrylonitrile pre-oxidized fiber has low strength, poor shearing strength and high processing difficulty, is damaged too much by a common needling process, has extremely low strength, can only be used for sound absorption cotton, heat insulation cotton and the like, and is not suitable for the field of high-temperature bag-type dust removal filter materials; 2. the needled felt processed by the polyacrylonitrile pre-oxidized fiber has rough surface, but the internal fiber surface is very smooth, and the structure has the defects of low filtration efficiency, poor dust cleaning performance, short service life and the like in the field of bag type dust removal, and needs to be frequently replaced, so that the cost is not reduced and increased. In order to promote polyacrylonitrileThe quality of pre-oxidized fiber is improved and enhanced by the prior art, such as the following: 201611114042.3 discloses a method for regulating and controlling the homogenization degree of polyacrylonitrile preoxidized fiber, which improves the homogenization degree of the fiber and enhances the use strength, stability and the like of the fiber by first removing oil, soaking and modifying by boric acid solution and finally carrying out preoxidation treatment. However, the method cannot well solve the problem of improving the adaptability of the polyacrylonitrile preoxidized fiber in the field of high-temperature-resistant bag-type dust removal filter materials. The invention carries out special modification preparation on polyacrylonitrile preoxidized fiber, wherein potassium permanganate and succinic acid are used for carrying out oxidation treatment on polyacrylonitrile powder raw material, so that the time and temperature of subsequent preoxidation treatment can be reduced, the smooth processing is facilitated, then a special composite additive component is prepared, the main component of the composite additive is a multi-walled carbon nanotube, when in preparation, the multi-walled carbon nanotube is processed into a multi-walled carbon nanotube film, the subsequent modification treatment is facilitated, He ion irradiation treatment is carried out on the multi-walled carbon nanotube film, the wall of the nanotube is etched by the irradiation treatment, partial tissue of the wall of the nanotube is deformed and broken, the tissue of the wall of the nanotube is roughened, the integral surface roughness is improved, helium bubble tissue with small particle diameter is introduced on the multi-walled carbon nanotube by irradiation, and the tissue can further improve the adsorption capacity of the multi-walled carbon nanotube, but can damage the multi-walled carbon nanotube with certain strength, then the component D of the mixed solution is prepared, the multi-walled carbon nanotube film after irradiation treatment is immersed in the mixed solution, at the moment, the precursor substance in the mixed solution D is deposited and attached under the action of ultrasonic waves, and finally, the precursor substance is dehydrated under the subsequent high-temperature drying condition to form the multi-walled carbon nanotube film formed by ZnO-TiO2The composite nano component is enriched at the damaged part of the multi-wall carbon nano tube to form a reinforcing tissue to make up for the improvement of the strength of the multi-wall carbon nano tube, and simultaneously the formation of the tissue is more beneficial to the enhancement of the compatible blending combination of the multi-wall carbon nano tube component and the polyacrylonitrile powder component, and finally the modified polypropylene filled with the composite additive with a large amount of hollow structures is formed after the blending, melting, extruding, stretching and heat setting treatment of the prepared composite additive and the polyacrylonitrile powderNitrile preoxidation fiber, its intensity quality is showing and is promoting to adsorption efficiency is strong, when making the needled felt and using, not only can rely on the fibre to weave the cooperation and filter the absorption, and single fibre self still has good absorption fixity ability, has promoted the filterable effect of filth, and then has promoted the adaptability application of polyacrylonitrile preoxidation fiber in high temperature resistant bag dust removal filter material field. On the basis of having promoted polyacrylonitrile preoxidation fiber material characteristic, correspond the fibre of selecting different fineness again and weave into the fibrous layer, carry out compound correspondence at last and made surface fibrous layer A and bottom surface fibrous layer B, this gradient structure's setting can improve the filter material to the impact resistance of air current, increases the filtration wind speed, reduces the pressure drop to it is more simple and convenient to enable reverse deashing.
Compared with the prior art, the invention has the following advantages:
the invention carries out special processing treatment on the dedusting filter material, optimizes and improves the raw material composition and structure, obviously improves the temperature resistance, strength, impact resistance, filtering efficiency and effect of the filter material, and the stability and service life of the filter material, and has great market competitiveness and production and use values.
Detailed Description
Example 1
A preparation method of a high-stability dedusting filter material comprises the following steps:
(1) preparation of the surface fiber layer A:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is 1.8dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber layer is 0.32 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is 2.4dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.42 mm;
c. opening, mixing, carding and lapping the crude polyacrylonitrile preoxidized fiber to prepare a crude polyacrylonitrile preoxidized fiber layer for later use; the specification of the crude polyacrylonitrile fiber is 3.2dtex multiplied by 60mm, and the thickness of the crude polyacrylonitrile fiber is 0.52 mm;
d. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a, the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation b and the coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation c up and down in sequence, and performing needling process to obtain a surface fiber layer A for later use;
(2) selecting base cloth:
selecting a low-density aramid woven fabric as base cloth, wherein aramid used by the low-density aramid woven fabric is the low-density aramid woven fabric 1313, the warp and weft densities of the low-density aramid woven fabric are the same and are both 35tex, and the warp density and the weft density of the low-density aramid woven fabric are also the same and are both 60 pieces/10 cm;
(3) preparing a bottom fiber layer B:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is 1.8dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber layer is 0.32 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is 2.4dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.42 mm;
c. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a and the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation B up and down, and performing needling process treatment to obtain a bottom fiber layer B for later use;
(4) preparing a finished product filter material:
and (3) sequentially arranging the surface fiber layer A prepared in the step (1), the base cloth selected in the step (2) and the bottom fiber layer B prepared in the step (3) from top to bottom, and then performing water needling process treatment to obtain the finished product filter material.
Further, the preparation method of the modified polyacrylonitrile pre-oxidized fiber comprises the following steps:
1) mixing potassium permanganate, succinic acid and ionic liquid according to the weight ratio of 3:1:500, putting the mixture into a stirring tank, continuously stirring for 5min, adding polyacrylonitrile powder with the mass being 2 times of the total mass of the mixture into the stirring tank, and continuously stirring for 10min to obtain a mixture A for later use; the ionic liquid is disubstituted imidazole type ionic liquid;
2) mixing a multi-wall carbon nano tube, fatty alcohol-polyoxyethylene ether and deionized water according to a weight ratio of 1: 7: 100, putting into a stirring tank, and then carrying out ultrasonic treatment for 1h by using ultrasonic waves with the frequency of 300kHz to obtain a mixed solution B for later use;
3) pouring the mixed solution B obtained in the step 2) onto a polytetrafluoroethylene filter membrane, carrying out suction filtration by using a suction filtration device under the environment of 520kPa to prepare a multi-walled carbon nanotube film, then repeatedly washing the prepared multi-walled carbon nanotube film by using deionized water and methanol until the washing solution is colorless, taking out the multi-walled carbon nanotube film, putting the multi-walled carbon nanotube film into a vacuum drying oven at the temperature of 90 ℃ for drying treatment, and taking out the multi-walled carbon nanotube film for later use after 8 hours;
4) putting the multi-walled carbon nanotube film treated in the step 3) into an irradiation box for He ion irradiation treatment, and taking out for later use after the He ion irradiation treatment is finished;
5) mixing zinc acetate dihydrate and N, N-dimethylformamide according to a weight ratio of 1:5, putting the mixture into a stirring tank, stirring at a high speed of 1200 rpm for 40min, and taking out to obtain a mixed solution C for later use;
6) putting the mixed solution C obtained in the step 5) into a reaction kettle, adding absolute ethyl alcohol accounting for 38% of the total volume of the mixed solution C into the reaction kettle, stirring at the rotating speed of 600 revolutions per minute for 30min, adding polyvinylpyrrolidone accounting for 17% of the total mass of the mixed solution C and butyl titanate accounting for 19% of the total mass of the mixed solution C into the reaction kettle, performing ultrasonic treatment for 2h by using ultrasonic waves with the frequency of 520kHz, and taking out the mixed solution C for later use;
7) immersing the multi-walled carbon nanotube film treated in the step 4) into the mixed solution D prepared in the step 6), heating to keep the temperature of the mixed solution D at 40 ℃, continuously performing ultrasonic treatment for 2 hours, then performing high-speed centrifugal treatment, washing a centrifugate once with deionized water, finally putting the centrifugate into an oxygen-free environment at 300 ℃, performing heat preservation and drying treatment for 3 hours, and taking out to obtain a composite additive for later use;
8) mixing the mixture A obtained in the step 1) and the composite additive obtained in the step 7) according to the weight ratio of 100:6, putting the mixture A and the composite additive into a double-screw spinning machine for melt spinning treatment, simultaneously introducing oxygen into a melting section of the double-screw spinning machine, controlling the flow of the introduced oxygen to be 3ml/min, and finally extruding to prepare semi-finished filaments for later use;
9) and (3) directly carrying out dry hot stretching on the semi-finished yarn prepared in the step 8), controlling the stretching temperature to be 120 ℃, controlling the total stretching multiple to be 5 times, cleaning and cooling the stretched fiber by using hot water at the temperature of 60 ℃, and finally putting the fiber into hot air at the temperature of 155 ℃ for heat setting treatment.
Further, the irradiation energy is controlled to be 330keV, the irradiation temperature is controlled to be 460 ℃, and the implantation amount is 2 x 10 during the He ion irradiation treatment in the step 4)16cm-2。
Further, the rotating speed of the screw in the twin-screw spinning machine in the step 8) is 80 rpm, the temperature of the feeding section is controlled to be 174 ℃, the temperature of the plasticizing section is controlled to be 188 ℃, and the temperature of the melting section is controlled to be 210 ℃.
Further, the needling process adopted in the steps (1) and (3) adopts 25-gauge needling type, the needling depth is 4mm, the needling frequency is 660 times/min, the needle density is 1400 pieces/m, and the output speed is 2.2 m/min.
Further, the spunlace process treatment in the step (4) adopts 8 spunlace heads, and the spunlace pressure is controlled to be 70 Bar.
Example 2
A preparation method of a high-stability dedusting filter material comprises the following steps:
(1) preparation of the surface fiber layer A:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is 1.9dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber layer is 0.35 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is 2.5dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.45 mm;
c. opening, mixing, carding and lapping the crude polyacrylonitrile preoxidized fiber to prepare a crude polyacrylonitrile preoxidized fiber layer for later use; the specification of the crude polyacrylonitrile fiber is 3.3dtex multiplied by 60mm, and the thickness of the crude polyacrylonitrile fiber is 0.55 mm;
d. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a, the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation b and the coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation c up and down in sequence, and performing needling process to obtain a surface fiber layer A for later use;
(2) selecting base cloth:
selecting a low-density aramid woven fabric as base cloth, wherein aramid used by the low-density aramid woven fabric is the low-density aramid woven fabric 1313, the warp and weft densities of the low-density aramid woven fabric are the same and are both 38tex, and the warp density and the weft density of the low-density aramid woven fabric are also the same and are both 65 pieces/10 cm;
(3) preparing a bottom fiber layer B:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is 1.9dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber layer is 0.35 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is 2.5dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.45 mm;
c. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a and the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation B up and down, and performing needling process treatment to obtain a bottom fiber layer B for later use;
(4) preparing a finished product filter material:
and (3) sequentially arranging the surface fiber layer A prepared in the step (1), the base cloth selected in the step (2) and the bottom fiber layer B prepared in the step (3) from top to bottom, and then performing water needling process treatment to obtain the finished product filter material.
Further, the preparation method of the modified polyacrylonitrile pre-oxidized fiber comprises the following steps:
1) mixing potassium permanganate, succinic acid and ionic liquid according to a weight ratio of 4:1.5:530, putting the mixture into a stirring tank, continuously stirring for 8min, adding polyacrylonitrile powder with the mass being 2.5 times of the total mass of the mixture into the stirring tank, and continuously stirring for 13min to obtain a mixture A for later use; the ionic liquid is disubstituted imidazole type ionic liquid;
2) mixing a multi-wall carbon nano tube, fatty alcohol-polyoxyethylene ether and deionized water according to a weight ratio of 1: 8: 105, mixing and putting into a stirring tank, and then carrying out ultrasonic treatment for 1.5h by using ultrasonic waves with the frequency of 330kHz to obtain a mixed solution B for later use;
3) pouring the mixed solution B obtained in the step 2) onto a polytetrafluoroethylene filter membrane, carrying out suction filtration by using a suction filtration device under the environment of 530kPa to prepare a multi-walled carbon nanotube film, then repeatedly washing the prepared multi-walled carbon nanotube film by using deionized water and methanol until the washing solution is colorless, taking out the multi-walled carbon nanotube film, putting the multi-walled carbon nanotube film into a vacuum drying oven at the temperature of 92 ℃ for drying treatment, and taking out the multi-walled carbon nanotube film for later use after 9 hours;
4) putting the multi-walled carbon nanotube film treated in the step 3) into an irradiation box for He ion irradiation treatment, and taking out for later use after the He ion irradiation treatment is finished;
5) mixing zinc acetate dihydrate and N, N-dimethylformamide according to a weight ratio of 1:6, putting into a stirring tank, stirring at a high speed of 1300 rpm for 45min, and taking out to obtain a mixed solution C for later use;
6) putting the mixed solution C obtained in the step 5) into a reaction kettle, adding absolute ethyl alcohol with the total volume of 40% of the mixed solution C into the reaction kettle, stirring at the rotating speed of 650 rpm for 33min, adding polyvinylpyrrolidone with the total mass of 18% of the mixed solution C and butyl titanate with the total mass of 21% into the reaction kettle, performing ultrasonic treatment for 2.3h by using ultrasonic waves with the frequency of 540kHz, and taking out the mixed solution C to obtain a mixed solution D for later use;
7) immersing the multi-walled carbon nanotube film treated in the step 4) into the mixed solution D prepared in the step 6), heating to keep the temperature of the mixed solution D at 43 ℃, continuously performing ultrasonic treatment for 2.5 hours, then performing high-speed centrifugal treatment, washing a centrifugate once with deionized water, finally putting the centrifugate into an oxygen-free environment at the temperature of 320 ℃, performing heat preservation and drying treatment for 4 hours, and taking out to obtain a composite additive for later use;
8) mixing the mixture A obtained in the step 1) and the composite additive obtained in the step 7) according to a weight ratio of 100:8, putting the mixture A and the composite additive into a double-screw spinning machine for melt spinning treatment, simultaneously introducing oxygen into a melting section of the double-screw spinning machine, controlling the flow of the introduced oxygen to be 4ml/min, and finally extruding to prepare semi-finished filaments for later use;
9) and (3) directly carrying out dry hot stretching on the semi-finished yarn prepared in the step 8), controlling the stretching temperature to be 125 ℃, controlling the total stretching multiple to be 5.5 times, then cleaning and cooling the stretched fiber by using hot water at the temperature of 63 ℃, and finally putting the fiber into hot air at the temperature of 160 ℃ for heat setting treatment.
Further, the irradiation energy is controlled to be 340keV, the irradiation temperature is controlled to be 470 ℃, and the implantation amount is 3 x 10 during the He ion irradiation treatment in the step 4)16cm-2。
Further, the rotating speed of the screw in the double-screw spinning machine in the step 8) is 90 r/min, the temperature of the feeding section is controlled to be 176 ℃, the temperature of the plasticizing section is controlled to be 190 ℃, and the temperature of the melting section is controlled to be 212 ℃.
Further, the needling process adopted in the steps (1) and (3) adopts 25-gauge needling type, the needling depth is 5mm, the needling frequency is 670 times/min, the needle density is 1450 pieces/m, and the output speed is 2.3 m/min.
Further, the spunlace process treatment in the step (4) adopts 8 spunlace heads, and the spunlace pressure is controlled to be 75 Bar.
Example 3
A preparation method of a high-stability dedusting filter material comprises the following steps:
(1) preparation of the surface fiber layer A:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is 2.0dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber layer is 0.38 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is 2.6dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.48 mm;
c. opening, mixing, carding and lapping the crude polyacrylonitrile preoxidized fiber to prepare a crude polyacrylonitrile preoxidized fiber layer for later use; the specification of the crude polyacrylonitrile fiber is 3.4dtex multiplied by 60mm, and the thickness of the crude polyacrylonitrile fiber is 0.58 mm;
d. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a, the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation b and the coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation c up and down in sequence, and performing needling process to obtain a surface fiber layer A for later use;
(2) selecting base cloth:
selecting a low-density aramid woven fabric as base cloth, wherein aramid used by the low-density aramid woven fabric is the low-density aramid woven fabric 1313, the warp and weft densities of the low-density aramid woven fabric are the same and are both 40tex, and the warp density and the weft density of the low-density aramid woven fabric are also the same and are both 70 pieces/10 cm;
(3) preparing a bottom fiber layer B:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is 2.0dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber layer is 0.38 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is 2.6dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.48 mm;
c. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a and the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation B up and down, and performing needling process treatment to obtain a bottom fiber layer B for later use;
(4) preparing a finished product filter material:
and (3) sequentially arranging the surface fiber layer A prepared in the step (1), the base cloth selected in the step (2) and the bottom fiber layer B prepared in the step (3) from top to bottom, and then performing water needling process treatment to obtain the finished product filter material.
Further, the preparation method of the modified polyacrylonitrile pre-oxidized fiber comprises the following steps:
1) mixing potassium permanganate, succinic acid and ionic liquid according to a weight ratio of 5:2:550, putting the mixture into a stirring tank, continuously stirring for 10min, adding polyacrylonitrile powder with the mass being 3 times of the total mass of the mixture into the stirring tank, and continuously stirring for 15min to obtain a mixture A for later use; the ionic liquid is disubstituted imidazole type ionic liquid;
2) mixing a multi-wall carbon nano tube, fatty alcohol-polyoxyethylene ether and deionized water according to a weight ratio of 1: 9: 110, putting into a stirring tank, and then carrying out ultrasonic treatment for 2 hours by using ultrasonic waves with the frequency of 350kHz to obtain a mixed solution B for later use;
3) pouring the mixed solution B obtained in the step 2) onto a polytetrafluoroethylene filter membrane, carrying out suction filtration by using a suction filtration device under the environment of 540kPa to prepare a multi-walled carbon nanotube film, then repeatedly washing the prepared multi-walled carbon nanotube film by using deionized water and methanol until the washing solution is colorless, taking out the multi-walled carbon nanotube film, putting the multi-walled carbon nanotube film into a vacuum drying oven at the temperature of 94 ℃ for drying treatment, and taking out the multi-walled carbon nanotube film for later use after 10 hours;
4) putting the multi-walled carbon nanotube film treated in the step 3) into an irradiation box for He ion irradiation treatment, and taking out for later use after the He ion irradiation treatment is finished;
5) mixing zinc acetate dihydrate and N, N-dimethylformamide according to a weight ratio of 1:7, putting into a stirring tank, stirring at a high speed of 1400 revolutions per minute for 50min, and taking out to obtain a mixed solution C for later use;
6) putting the mixed solution C obtained in the step 5) into a reaction kettle, adding absolute ethyl alcohol accounting for 42% of the total volume of the mixed solution C into the reaction kettle, stirring at the rotating speed of 700 r/min for 35min, adding polyvinylpyrrolidone accounting for 19% of the total mass of the mixed solution C and butyl titanate accounting for 22% of the total mass of the mixed solution C into the reaction kettle, performing ultrasonic treatment for 2.5h by using ultrasonic waves with the frequency of 550kHz, and taking out the treated mixed solution C to obtain a mixed solution D for later use;
7) immersing the multi-walled carbon nanotube film treated in the step 4) into the mixed solution D prepared in the step 6), heating to keep the temperature of the mixed solution D at 46 ℃, continuously performing ultrasonic treatment for 3 hours, then performing high-speed centrifugal treatment, washing a centrifugate once with deionized water, finally putting the centrifugate into an oxygen-free environment at 330 ℃, performing heat preservation and drying treatment for 5 hours, and taking out to obtain a composite additive for later use;
8) mixing the mixture A obtained in the step 1) and the composite additive obtained in the step 7) according to the weight ratio of 100:9, putting the mixture A and the composite additive into a double-screw spinning machine for melt spinning treatment, simultaneously introducing oxygen into a melting section of the double-screw spinning machine, controlling the flow of the introduced oxygen to be 5ml/min, and finally extruding to prepare semi-finished filaments for later use;
9) and (3) directly carrying out dry hot stretching on the semi-finished yarn prepared in the step 8), controlling the stretching temperature to be 130 ℃, controlling the total stretching multiple to be 6 times, cleaning and cooling the stretched fiber by using hot water at the temperature of 65 ℃, and finally putting the fiber into hot air at the temperature of 165 ℃ for heat setting treatment.
Further, the irradiation energy is controlled to be 350keV, the irradiation temperature is controlled to be 480 ℃, and the injection amount is 4 multiplied by 10 during the He ion irradiation treatment in the step 4)16cm-2。
Further, the rotating speed of the screws in the twin-screw spinning machine in the step 8) is 100 revolutions per minute, the temperature of the feeding section is controlled to be 178 ℃, the temperature of the plasticizing section is controlled to be 192 ℃, and the temperature of the melting section is controlled to be 214 ℃.
Further, the needling process adopted in the steps (1) and (3) adopts 25-gauge needling type, the needling depth is 6mm, the needling frequency is 680 times/min, the needle density is 1500 pieces/m, and the output speed is 2.4 m/min.
Further, the spunlace process treatment in the step (4) adopts 8 spunlace heads, and the spunlace pressure is controlled to be 80 Bar.
Comparative example 1
In comparison with example 2, in comparative example 1, the process of step 4) was omitted in the preparation of modacrylic pre-oxidized fiber, except that the process steps were the same.
Comparative example 2
Compared with the example 2, the comparative example 2 omits the step 5), the step 6) and the subsequent corresponding treatment in the preparation of the modacrylic preoxidized fiber, except that the steps of the other methods are the same.
Comparative example 3
In comparison with example 2, in comparative example 3, in the preparation of modacrylic pre-oxidized fiber, the composite additive component obtained in step 7) used in step 8) was replaced with an equal mass part of commercially available multi-walled carbon nanotubes, except that the other steps of the method were the same.
Comparative example 4
In comparison with example 2, in comparative example 4, the composite additive component obtained in step 7) used in step 8) was omitted in the preparation of modacrylic pre-oxidized fiber, except that the other steps of the method were the same.
Comparative example 5
In comparison with example 2, in comparative example 5, in the preparation of the surface fiber layer a in step (1) and the bottom fiber layer B in step (3), the following applications were used: 201611114042.3 discloses a method for regulating the homogenization degree of polyacrylonitrile pre-oxidized fiber, which is used for replacing the raw material components of the modified polyacrylonitrile pre-oxidized fiber, except that the steps of the method are the same.
Control group
The application numbers are: 201110199266.X discloses a composite filter material for a high-temperature flue gas bag type dust removal system and a preparation method thereof.
In order to compare the effects of the present invention, the performance tests were performed on the filter materials prepared in the above examples 2, 1, 2, 3, 4, 5 and 5, and the comparison data are shown in the following table 1:
TABLE 1
Figure DEST_PATH_IMAGE001
Note: the tearing strength in table 1 above is measured as the longitudinal strength of the filter material (as the transverse strength of the filter material is generally greater than the longitudinal strength, the weaker longitudinal strength is used to characterize the overall strength performance); the strength loss rate at 300 ℃ is the longitudinal strength loss rate measured after the filter material is placed in an environment at 300 ℃ for heat preservation treatment for 12 hours; the dust stripping rate is the stripping rate of the dust in 30 times of 1000Pa ash cleaning cycles.
As can be seen from the above table 1, the comprehensive use quality of the dedusting filter material prepared by the method of the invention is remarkably improved, and the dedusting filter material has strong use stability and service life, and has high market competitiveness and popularization and application values.

Claims (5)

1. The preparation method of the high-stability dedusting filter material is characterized by comprising the following steps of:
(1) preparation of the surface fiber layer A:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is (1.8-2.0) dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber layer is 0.32-0.38 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is (2.4-2.6) dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.42-0.48 mm;
c. opening, mixing, carding and lapping the crude polyacrylonitrile preoxidized fiber to prepare a crude polyacrylonitrile preoxidized fiber layer for later use; the specification of the crude polyacrylonitrile modified preoxidized fiber is (3.2-3.4) dtex multiplied by 60mm, and the thickness of the crude polyacrylonitrile modified preoxidized fiber layer is 0.52-0.58 mm;
d. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a, the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation b and the coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation c up and down in sequence, and performing needling process to obtain a surface fiber layer A for later use;
(2) selecting base cloth:
selecting a low-density aramid woven fabric as a base fabric, wherein aramid used by the low-density aramid woven fabric is a low-density aramid woven fabric 1313, the warp and weft densities of the low-density aramid woven fabric are the same and are both 35-40 tex, and the warp density and the weft density are also the same and are both 60-70 pieces/10 cm;
(3) preparing a bottom fiber layer B:
a. opening, mixing, carding and lapping the fine polyacrylonitrile preoxidized fiber to prepare a fine polyacrylonitrile preoxidized fiber layer for later use; the specification of the fine polyacrylonitrile fiber is (1.8-2.0) dtex multiplied by 60mm, and the thickness of the fine polyacrylonitrile fiber layer is 0.32-0.38 mm;
b. preparing the medium-coarse modified polyacrylonitrile pre-oxidized fiber layer for later use after opening, mixing, carding and lapping the medium-coarse modified polyacrylonitrile pre-oxidized fiber; the specification of the medium-coarse modacrylic preoxidized fiber is (2.4-2.6) dtex multiplied by 60mm, and the thickness of the medium-coarse modacrylic preoxidized fiber layer is 0.42-0.48 mm;
c. arranging the fine polyacrylonitrile pre-oxidized fiber layer prepared in the operation a and the medium-coarse polyacrylonitrile pre-oxidized fiber layer prepared in the operation B up and down, and performing needling process treatment to obtain a bottom fiber layer B for later use;
(4) preparing a finished product filter material:
sequentially arranging the surface fiber layer A prepared in the step (1), the base cloth selected in the step (2) and the bottom fiber layer B prepared in the step (3) from top to bottom, and then performing water needling process treatment to obtain a finished product filter material;
the preparation method of the modified polyacrylonitrile pre-oxidized fiber comprises the following steps:
1) mixing potassium permanganate, succinic acid and ionic liquid according to a weight ratio of 3-5: 1-2: 500-550, putting the mixture into a stirring tank, continuously stirring for 5-10 min, adding polyacrylonitrile powder with the mass being 2-3 times of the total mass of the polyacrylonitrile powder into the stirring tank, and continuously stirring for 10-15 min to obtain a mixture A for later use; the ionic liquid is disubstituted imidazole type ionic liquid;
2) the preparation method comprises the following steps of (1) mixing a multi-walled carbon nanotube, fatty alcohol-polyoxyethylene ether and deionized water in a weight ratio of 1: 7-9: 100-110, mixing, putting into a stirring tank, and performing ultrasonic treatment for 1-2 hours by using ultrasonic waves with the frequency of 300-350 kHz to obtain a mixed solution B for later use;
3) pouring the mixed solution B obtained in the step 2) onto a polytetrafluoroethylene filter membrane, carrying out suction filtration by using a suction filtration device in an environment of 520-540 kPa to obtain a multi-walled carbon nanotube film, then repeatedly washing the prepared multi-walled carbon nanotube film by using deionized water and methanol until the washing solution is colorless, taking out the multi-walled carbon nanotube film, putting the multi-walled carbon nanotube film into a vacuum drying oven at the temperature of 90-94 ℃ for drying treatment, and taking out the multi-walled carbon nanotube film for later use after 8-10 hours;
4) putting the multi-walled carbon nanotube film treated in the step 3) into an irradiation box for He ion irradiation treatment, and taking out for later use after the He ion irradiation treatment is finished;
5) mixing zinc acetate dihydrate and N, N-dimethylformamide according to a weight ratio of 1: 5-7, putting the mixture into a stirring tank, stirring at a high speed of 1200-1400 rpm for 40-50 min, and taking out to obtain a mixed solution C for later use;
6) putting the mixed liquid C obtained in the step 5) into a reaction kettle, adding absolute ethyl alcohol accounting for 38-42% of the total volume of the mixed liquid C into the reaction kettle, stirring at the rotating speed of 600-700 rpm for 30-35 min, adding polyvinylpyrrolidone accounting for 17-19% of the total mass of the mixed liquid C and butyl titanate accounting for 19-22% of the total mass of the mixed liquid C into the reaction kettle, performing ultrasonic treatment for 2-2.5 h by using ultrasonic waves with the frequency of 520-550 kHz, and taking out the treated mixed liquid C to obtain a mixed liquid D for later use;
7) immersing the multiwalled carbon nanotube film treated in the step 4) into the mixed solution D prepared in the step 6), heating to keep the temperature of the mixed solution D at 40-46 ℃, continuously performing ultrasonic treatment for 2-3 h, then performing high-speed centrifugal treatment, washing a centrifugate once with deionized water, finally putting the centrifugate into an oxygen-free environment at the temperature of 300-330 ℃, performing heat preservation and drying treatment for 3-5 h, and taking out to obtain a composite additive for later use;
8) mixing the mixture A obtained in the step 1) and the composite additive obtained in the step 7) according to a weight ratio of 100: 6-9, putting the mixture A and the composite additive into a double-screw spinning machine for melt spinning treatment, simultaneously introducing oxygen into a melting section of the double-screw spinning machine, controlling the flow of introducing the oxygen to be 3-5 ml/min, and finally extruding to prepare semi-finished filaments for later use;
9) and (3) directly carrying out dry heat stretching on the semi-finished yarn prepared in the step 8), controlling the stretching temperature to be 120-130 ℃, controlling the total stretching multiple to be 5-6 times, cleaning and cooling the stretched fiber by using hot water at the temperature of 60-65 ℃, and finally putting the fiber into hot air at the temperature of 155-165 ℃ for heat setting treatment.
2. The method for preparing the high-stability dedusting filter material according to claim 1, wherein the He ion irradiation treatment in the step 4) is controlledThe irradiation energy is 330-350 keV, the irradiation temperature is controlled to be 460-480 ℃, and the injection amount is 2-4 multiplied by 1016cm-2。
3. The preparation method of the high-stability dedusting filter material according to claim 2, wherein the rotation speed of the screws in the twin-screw spinning machine in the step 8) is 80-100 r/min, the temperature of the feeding section is controlled to be 174-178 ℃, the temperature of the plasticizing section is controlled to be 188-192 ℃, and the temperature of the melting section is controlled to be 210-214 ℃.
4. The preparation method of the high-stability dedusting filter material according to claim 1, wherein the needling process adopted in the step (1) and the step (3) is 25 gauge, the needling depth is 4-6 mm, the needling frequency is 660-680 times/min, the needle density is 1400-1500 pieces/m, and the output speed is 2.2-2.4 m/min.
5. The preparation method of the high-stability dedusting filter material as claimed in claim 1, wherein the spunlace process in step (4) adopts 8 spunlace heads, and the spunlace pressure is controlled to be 70-80 Bar.
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