CN112387008B - Antioxidant PPS (polyphenylene sulfide) filter material and preparation process thereof - Google Patents

Antioxidant PPS (polyphenylene sulfide) filter material and preparation process thereof Download PDF

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CN112387008B
CN112387008B CN202011152449.1A CN202011152449A CN112387008B CN 112387008 B CN112387008 B CN 112387008B CN 202011152449 A CN202011152449 A CN 202011152449A CN 112387008 B CN112387008 B CN 112387008B
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electret
surface layer
pps
filter material
antioxidant
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CN112387008A (en
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李绍林
孙淑娟
李承润
胡深
黄燎辉
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Anhui Zhongdian Environmental Protection Material Co ltd
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Anhui Zhongdian Environmental Protection 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

The invention belongs to the technical field of filter felts, in particular to an antioxidant PPS filter material and a preparation process thereof, wherein S1 is used for preparing electrets A and B; electret A is composed of polyethylene, polyurethane, PTFE, organosilicon and deionized water; electret B is composed of carbon nanofiber, titanium dioxide nanofiber, PTFE, epoxy resin and deionized water; s2, carding; spraying the prepared electret A on the surfaces of the first surface layer, the second surface layer and the third surface layer respectively; s3, lapping; the number of the lapping layers of the first surface layer is 6-8, the number of the second surface layer is 10-15, and the number of the third surface layer is 5-10. According to the anti-oxidation PPS filter material and the preparation process thereof, through the arrangement of the electrets A and B, the PPS limiting oxygen index can be effectively increased, and the electret material is widely applied to the field of high-efficiency low-resistance air filter materials. Electret air filter materials require materials with high charge storage density, long life and high stability.

Description

Antioxidant PPS (polyphenylene sulfide) filter material and preparation process thereof
Technical Field
The invention relates to the technical field of filter felts, in particular to an antioxidant PPS filter material and a preparation process thereof.
Background
The main aim of the industrial dust removal technology is to control the emission of pollutant source smoke particles and reduce the atmospheric pollution. At present, aiming at the treatment of industrial high-temperature flue gas, three methods of wet dust removal, electric dust removal and bag dust removal are mainly adopted, wherein the bag dust remover is superior to the wet dust removal and the electric dust removal in the aspects of dust removal efficiency, disposable and long-term investment cost, equipment requirement, performance and the like, and the two methods are gradually replaced to occupy the market of main stream industrial dust removers. The core of the bag type dust collector is a high-temperature resistant filter material, and the performance of the high-temperature resistant filter material is directly related to the high efficiency, stability and reliability and long-time operation of the dust collector.
The flue gas generated after the coal is burnt has a large amount of dust and heat, which means that the filtering material for filtering the coal dust is required to be resistant to high temperature, and in the common filtering material, the filtering material is easy to expand when being heated due to the influence of thermal expansion and cold contraction in actual use, and the filtering gap is reduced or even closed due to the thermal expansion, so that the filtering effect is easily influenced.
Disclosure of Invention
Based on the technical problem that the conventional filter material is easily affected by heat to reduce the filtering effect, the invention provides an antioxidant PPS filter material and a preparation process thereof.
The invention provides an antioxidant PPS filter material and a preparation process thereof, wherein S1, electret A and electret B are prepared;
electret A is composed of polyethylene, polyurethane, PTFE, organosilicon and deionized water;
electret B is composed of carbon nanofiber, titanium dioxide nanofiber, PTFE, epoxy resin and deionized water;
s2, carding; spraying the prepared electret A on the surfaces of the first surface layer, the second surface layer and the third surface layer respectively;
s3, lapping; the number of the lapping layers of the first surface layer is 6-8, the number of the second surface layer is 10-15, and the number of the third surface layer is 5-10;
s4, needling;
s5, soaking; the first surface layer, the second surface layer and the third surface layer are driven by a roller to be immersed into an immersion tank filled with electret B;
s6, shaping.
Preferably, the electret A comprises 2-3% of polyethylene, 1-2% of polyurethane, 0.5-1% of PTFE, 3-6% of organosilicon and 85-90% of deionized water.
Preferably, the step of preparing electret a further comprises;
s11, adding the polyethylene, the polyurethane, the PTFE and the organosilicon into deionized water, and mechanically stirring for 25-30min at 20-25Hz;
s12, applying voltage of 5-15Kv to the liquid stirred in the step S11, wherein the duration time is 3-5min;
s13, evaporating the liquid prepared in the step S12 at 100-120 ℃ until the content of deionized water is reduced to 50-60%, and finally obtaining the electret A.
Preferably, 3-5% of carbon nanofiber, 2-3% of titanium dioxide nanofiber, 0.5-1% of PTFE, 3-5% of epoxy resin and 80-86% of deionized water in the electret B.
Preferably, the step of preparing electret B further comprises;
s14, adding the carbon nanofiber, the titanium dioxide nanofiber, the PTFE and the epoxy resin into deionized water, and mechanically stirring for 30-50min at a stirring speed of 300-500 r/min;
s15, evaporating the liquid stirred in the step S14 at 100-110 ℃ until the moisture content is reduced to 75-80%, and finally obtaining the electret B.
Preferably, the first surface layer is composed of PPS and fine carbon fiber filaments, and the mass ratio of the PPS to the fine carbon fiber filaments is (1-2): (3-4);
the second surface layer consists of PPS and carbon nanofiber filaments, and the mass ratio of the PPS to the carbon nanofiber filaments is (3-5): (1-2);
the third surface layer consists of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is (3-4): (0.5-1).
Preferably, the electret A spraying pressure in the S2 is 80-100kg/cm 2 The spraying speed is 300-350 square meters per hour.
Preferably, the diameter of the puncture needle in the S4 needling is 0.6-0.75mm, the needling frequency is 1500-2000/min, and the needling depth is 6-8.5mm.
Preferably, the shaping in the step S6 adopts a heat shaping mode, heating and shaping in a dryer, wherein the heating temperature is firstly increased to 280-320 ℃, then cooled to 190-210 ℃ and shaping is carried out, and the shaping time is 12-14S.
Preferably, the antioxidant PPS filter material comprises a filter layer, wherein the filter layer is composed of an electret A, an electret B, a first surface layer, a second surface layer and a third surface layer, and the filter layer is sequentially provided with the electret B, the first surface layer, the electret A, the second surface layer, the electret A and the third surface layer from outside to inside.
The beneficial effects of the invention are as follows:
1. through setting up electret A and electret B, can effectively increase PPS limit oxygen index, electret material is widely used in high-efficient low resistance air filter material field. Electret air filter material requires that the material has large density of stored charges, long service life and high stability;
the filtering efficiency of the electret filtering material is far higher than that of the conventional filtering material; the dust catching mechanism of the conventional fiber filter material mainly depends on direct interception, brownian diffusion, inertial collision, gravity deposition and other mechanical blocking effects, the electrostatic adsorption effect between the filter material and particles is very weak, and the filter effect on particles with the particle size smaller than 1 μm is very poor. If electrostatic adsorption is enhanced in the air filtration process, besides the original mechanical blocking effect, charged particles in the air phase are directly absorbed and captured by virtue of coulomb force, or neutral particles are induced to generate polarity and then captured, the filtration efficiency is obviously greatly enhanced, and the filtration resistance is also reduced.
2. The electret B contains carbon nanofiber filaments, so that the air permeability can be increased;
the carbon nanofibers refer to carbon fibers having a nano-scale, and can be classified into carbon nanotubes, i.e., hollow carbon nanofibers and solid carbon nanofibers, according to their structural characteristics. The carbon nano fiber has the characteristics of low density, high specific modulus, high specific strength, high conductivity, high thermal stability and the like of common carbon fiber grown by a chemical vapor deposition method, and has the advantages of small defect number, large length-diameter ratio, large specific surface area, compact structure and the like, thus the carbon nano fiber is a high-performance fiber, not only has the inherent intrinsic property of the carbon material, but also has the soft processability of textile fiber.
Drawings
Fig. 1 is a schematic diagram of an antioxidant PPS filter material and a process for preparing the same according to the present invention.
In the figure: 1. electret A; 2. electret B; 3. a first facing; 4. a second facing; 5. and a third facing layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Example 1
Referring to fig. 1, an antioxidant PPS filter material and a process for preparing the same, S1, preparing electrets A1 and B2;
electret A1 is composed of polyethylene, polyurethane, PTFE, organosilicon and deionized water;
polyethylene 2%, polyurethane 1%, PTFE 0.5%, organosilicon 3% and deionized water 85% in electret A1;
the preparation step of the electret A1 also comprises;
s11, adding the polyethylene, the polyurethane, the PTFE and the organosilicon into deionized water, and mechanically stirring for 25min at a stirring frequency of 20Hz;
s12, applying a voltage of 5Kv to the liquid stirred in the step S11, wherein the duration time is 3min;
and S13, evaporating the liquid prepared in the step S12 at the temperature of 100 ℃ until the content of deionized water is reduced to 50%, and finally preparing the electret A1.
Electret B2 is composed of carbon nanofiber, titanium dioxide nanofiber, PTFE, epoxy resin and deionized water;
3% of carbon nanofiber, 2% of titanium dioxide nanofiber, 0.5% of PTFE, 3% of epoxy resin and 80% of deionized water in electret B2;
the preparation step of the electret B2 further comprises;
s14, adding the carbon nanofiber, the titanium dioxide nanofiber, the PTFE and the epoxy resin into deionized water, and mechanically stirring for 30min at a stirring speed of 300 r/min;
s15, evaporating the liquid stirred in the step S14 at 100 ℃ until the moisture content is reduced to 75%, and finally preparing the electret B2;
the electret B2 contains carbon nanofiber filaments, so that the air permeability can be increased;
the carbon nanofiber refers to carbon fiber with nanometer scale, can be divided into carbon nanotubes, namely hollow carbon nanofiber and solid carbon nanofiber according to the structural characteristics, is quasi-one-dimensional carbon material between the carbon nanotubes and common carbon fiber, has higher crystallization orientation degree and better electric conduction and heat conduction performance, and has the advantages of small defect number, large length-diameter ratio, large specific surface area, compact structure and the like besides the characteristics of low density, high specific modulus, high specific strength, high electric conduction, thermal stability and the like of the common carbon fiber grown by a chemical vapor deposition method.
S2, carding; spraying the prepared electret A1 on the surfaces of the first surface layer 3, the second surface layer 4 and the third surface layer 5 respectively;
the first surface layer 3 is composed of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is 1:3, a step of;
the second surface layer 4 is composed of PPS and carbon nanofiber filaments, and the mass ratio of the PPS to the carbon nanofiber filaments is 3:1, a step of;
the third surface layer 5 is composed of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is 3:0.5.
s3, lapping; the number of the lapping layers of the first surface layer 3 is 6, the number of the second surface layer 4 is 10, and the number of the third surface layer 5 is 5;
in S2, the electret A1 spraying pressure is 80kg/cm2, and the spraying speed is 300 square meters per hour.
S4, needling; the diameter of the puncture needle in S4 needling is 0.6mm, the needling frequency is 1500/min, and the needling depth is 6mm.
S5, soaking; the first surface layer 3, the second surface layer 4 and the third surface layer 5 are driven by rollers to be immersed into an immersion tank provided with electrets B2;
s6, shaping; and S6, shaping by adopting a heat shaping mode, heating and shaping in a dryer, wherein the heating temperature is firstly increased to 280-290 ℃, then the temperature is reduced to 190-195 ℃, and shaping is carried out for 12-14S.
Through setting up electret A1 and electret B2, can effectively increase PPS limit oxygen index, electret material is widely used in high-efficient low resistance air filter material field. Electret air filter material requires that the material has large density of stored charges, long service life and high stability;
the filtering efficiency of the electret filtering material is far higher than that of the conventional filtering material; the dust catching mechanism of the conventional fiber filter material mainly depends on direct interception, brownian diffusion, inertial collision, gravity deposition and other mechanical blocking effects, the electrostatic adsorption effect between the filter material and particles is very weak, and the filter effect on particles with the particle size smaller than 1 μm is very poor. If electrostatic adsorption is enhanced in the air filtration process, besides the original mechanical blocking effect, charged particles in the air phase are directly absorbed and captured by virtue of coulomb force, or neutral particles are induced to generate polarity and then captured, the filtration efficiency is obviously greatly enhanced, and the filtration resistance is also reduced.
Example two
Referring to fig. 1, an antioxidant PPS filter material and a process for preparing the same, S1, preparing electrets A1 and B2;
electret A1 is composed of polyethylene, polyurethane, PTFE, organosilicon and deionized water;
polyethylene 3%, polyurethane 2%, PTFE 1%, organosilicon 6% and deionized water 90% in electret A1;
the preparation step of the electret A1 also comprises;
s11, adding the polyethylene, the polyurethane, the PTFE and the organosilicon into deionized water, and mechanically stirring for 30min at a stirring frequency of 25Hz;
s12, applying a voltage of 15Kv to the liquid stirred in the step S11, wherein the duration time is 5min;
and S13, evaporating the liquid prepared in the step S12 at 120 ℃ until the content of deionized water is reduced to 60%, and finally obtaining the electret A1.
Electret B2 is composed of carbon nanofiber, titanium dioxide nanofiber, PTFE, epoxy resin and deionized water;
carbon nanofiber 5%, titanium dioxide nanofiber 3%, PTFE 1%, epoxy resin 5% and deionized water 86% in electret B2;
the preparation step of the electret B2 further comprises;
s14, adding the carbon nanofiber, the titanium dioxide nanofiber, the PTFE and the epoxy resin into deionized water, and mechanically stirring for 50min at a stirring speed of 500 r/min;
and S15, evaporating the liquid stirred in the step S14 at 110 ℃ until the moisture content is reduced to 80%, and finally obtaining the electret B2.
The electret B2 contains carbon nanofiber filaments, so that the air permeability can be increased;
the carbon nanofiber refers to carbon fiber with nanometer scale, can be divided into carbon nanotubes, namely hollow carbon nanofiber and solid carbon nanofiber according to the structural characteristics, is quasi-one-dimensional carbon material between the carbon nanotubes and common carbon fiber, has higher crystallization orientation degree and better electric conduction and heat conduction performance, and has the advantages of small defect number, large length-diameter ratio, large specific surface area, compact structure and the like besides the characteristics of low density, high specific modulus, high specific strength, high electric conduction, thermal stability and the like of the common carbon fiber grown by a chemical vapor deposition method.
S2, carding; spraying the prepared electret A1 on the surfaces of the first surface layer 3, the second surface layer 4 and the third surface layer 5 respectively;
the first surface layer 3 is composed of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is 2:4, a step of;
the second surface layer 4 is composed of PPS and carbon nanofiber filaments, and the mass ratio of the PPS to the carbon nanofiber filaments is 5:2;
the third surface layer 5 is composed of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is 4:1.
s3, lapping; the number of the lapping layers of the first surface layer 3 is 8, the number of the second surface layer 4 is 15, and the number of the third surface layer 5 is 10;
s2 electret A1 spraying pressure is 100kg/cm 2 The spraying speed was 350 square meters per hour.
S4, needling; the diameter of the puncture needle in S4 needling is 0.75mm, the needling frequency is 2000/min, and the needling depth is 8.5mm.
S5, soaking; the first surface layer 3, the second surface layer 4 and the third surface layer 5 are driven by rollers to be immersed into an immersion tank provided with electrets B2;
s6, shaping; and S6, shaping by adopting a heat shaping mode, heating and shaping in a dryer, wherein the heating temperature is firstly increased to 295-320 ℃, then reduced to 200-210 ℃ and shaping is carried out, and the shaping time is 14S.
Through setting up electret A1 and electret B2, can effectively increase PPS limit oxygen index, electret material is widely used in high-efficient low resistance air filter material field. Electret air filter material requires that the material has large density of stored charges, long service life and high stability;
the filtering efficiency of the electret filtering material is far higher than that of the conventional filtering material; the dust catching mechanism of the conventional fiber filter material mainly depends on direct interception, brownian diffusion, inertial collision, gravity deposition and other mechanical blocking effects, the electrostatic adsorption effect between the filter material and particles is very weak, and the filter effect on particles with the particle size smaller than 1 μm is very poor. If electrostatic adsorption is enhanced in the air filtration process, besides the original mechanical blocking effect, charged particles in the air phase are directly absorbed and captured by virtue of coulomb force, or neutral particles are induced to generate polarity and then captured, the filtration efficiency is obviously greatly enhanced, and the filtration resistance is also reduced.
Example III
Referring to fig. 1, an antioxidant PPS filter material and a process for preparing the same, S1, preparing electrets A1 and B2;
electret A1 is composed of polyethylene, polyurethane, PTFE, organosilicon and deionized water;
2.5% of polyethylene, 1.5% of polyurethane, 0.8% of PTFE, 4% of organic silicon and 87% of deionized water in electret A1;
the preparation step of the electret A1 also comprises;
s11, adding the polyethylene, the polyurethane, the PTFE and the organosilicon into deionized water, and mechanically stirring for 28min at the stirring frequency of 23Hz;
s12, applying 10Kv voltage to the liquid stirred in the step S11, wherein the duration is 4min;
s13, evaporating the liquid prepared in the step S12 at 110-115 ℃ until the content of deionized water is reduced to 54-56%, and finally obtaining the electret A1.
Electret B2 is composed of carbon nanofiber, titanium dioxide nanofiber, PTFE, epoxy resin and deionized water;
carbon nanofiber 4%, titanium dioxide nanofiber 2.5%, PTFE 0.8%, epoxy resin 4% and deionized water 83% in electret B2;
the preparation step of the electret B2 further comprises;
s14, adding the carbon nanofiber, the titanium dioxide nanofiber, the PTFE and the epoxy resin into deionized water, and mechanically stirring for 40min at a stirring speed of 400 rpm;
s15, evaporating the liquid stirred in the step S14 at 105 ℃ until the moisture content is reduced to 78%, and finally preparing the electret B2;
the electret B2 contains carbon nanofiber filaments, so that the air permeability can be increased;
the carbon nanofiber refers to carbon fiber with nanometer scale, can be divided into carbon nanotubes, namely hollow carbon nanofiber and solid carbon nanofiber according to the structural characteristics, is quasi-one-dimensional carbon material between the carbon nanotubes and common carbon fiber, has higher crystallization orientation degree and better electric conduction and heat conduction performance, and has the advantages of small defect number, large length-diameter ratio, large specific surface area, compact structure and the like besides the characteristics of low density, high specific modulus, high specific strength, high electric conduction, thermal stability and the like of the common carbon fiber grown by a chemical vapor deposition method.
S2, carding; spraying the prepared electret A1 on the surfaces of the first surface layer 3, the second surface layer 4 and the third surface layer 5 respectively;
the first surface layer 3 is composed of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is 1.5:3.5;
the second surface layer 4 is composed of PPS and carbon nanofiber filaments, and the mass ratio of the PPS to the carbon nanofiber filaments is 4:1.5;
the third surface layer 5 is composed of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is 3.5:0.8.
s3, lapping; the number of the lapping layers of the first surface layer 3 is 7, the number of the second surface layer 4 is 12, and the number of the third surface layer 5 is 8;
in S2, the electret A1 spraying pressure is 90kg/cm2, and the spraying speed is 330 square meters per hour.
S4, needling; the diameter of the puncture needle in S4 needling is 0.65mm, the needling frequency is 1800/min, and the needling depth is 7.5mm.
S5, soaking; the first surface layer 3, the second surface layer 4 and the third surface layer 5 are driven by rollers to be immersed into an immersion tank provided with electrets B2;
s6, shaping; and S6, shaping by adopting a heat shaping mode, heating and shaping in a dryer, wherein the heating temperature is firstly increased to 290-295 ℃, then reduced to 195-200 ℃, and shaping is carried out for 13S.
Through setting up electret A1 and electret B2, can effectively increase PPS limit oxygen index, electret material is widely used in high-efficient low resistance air filter material field. Electret air filter material requires that the material has large density of stored charges, long service life and high stability;
the filtering efficiency of the electret filtering material is far higher than that of the conventional filtering material; the dust catching mechanism of the conventional fiber filter material mainly depends on direct interception, brownian diffusion, inertial collision, gravity deposition and other mechanical blocking effects, the electrostatic adsorption effect between the filter material and particles is very weak, and the filter effect on particles with the particle size smaller than 1 μm is very poor. If electrostatic adsorption is enhanced in the air filtration process, besides the original mechanical blocking effect, charged particles in the air phase are directly absorbed and captured by virtue of coulomb force, or neutral particles are induced to generate polarity and then captured, the filtration efficiency is obviously greatly enhanced, and the filtration resistance is also reduced.
Example IV
Referring to fig. 1, an antioxidant PPS filter material includes a filter layer, the filter layer is composed of an electret A1, an electret B2, a first surface layer 3, a second surface layer 4, and a third surface layer 5, and the filter layer is sequentially, from outside to inside, an electret B2, a first surface layer 3, an electret A1, a second surface layer 4, an electret A1, and a third surface layer 5.
The electret B2 contains carbon nanofiber filaments, so that the air permeability can be increased;
the carbon nanofiber refers to carbon fiber with nanometer scale, can be divided into carbon nanotubes, namely hollow carbon nanofiber and solid carbon nanofiber according to the structural characteristics, is quasi-one-dimensional carbon material between the carbon nanotubes and common carbon fiber, has higher crystallization orientation degree and better electric conduction and heat conduction performance, and has the advantages of small defect number, large length-diameter ratio, large specific surface area, compact structure and the like besides the characteristics of low density, high specific modulus, high specific strength, high electric conduction, thermal stability and the like of the common carbon fiber grown by a chemical vapor deposition method.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (10)

1. A preparation process of an antioxidant PPS filter material is characterized by comprising the following steps:
the method comprises the following steps:
s1, preparing an electret A (1) and an electret B (2);
electret A (1) is composed of polyethylene, polyurethane, PTFE, organosilicon and deionized water;
electret B (2) is composed of carbon nanofiber, titanium dioxide nanofiber, PTFE, epoxy resin and deionized water;
s2, carding; spraying the prepared electret A (1) on the surfaces of the first surface layer (3), the second surface layer (4) and the third surface layer (5) respectively;
s3, lapping; the number of the lapping layers of the first surface layer (3) is 6-8, the number of the second surface layer (4) is 10-15, and the number of the third surface layer (5) is 5-10;
s4, needling;
s5, soaking; the first surface layer (3), the second surface layer (4) and the third surface layer (5) are driven by a roller to be immersed into an immersion tank filled with an electret B (2);
s6, shaping.
2. The process for preparing the antioxidant PPS filter material according to claim 1, wherein the process comprises the following steps: 2-3% of polyethylene, 1-2% of polyurethane, 0.5-1% of PTFE, 3-6% of organosilicon and 85-90% of deionized water in the electret A (1).
3. The process for preparing the antioxidant PPS filter material according to claim 2, wherein the process comprises the following steps: the preparation step of the electret A (1) further comprises;
s11, adding the polyethylene, the polyurethane, the PTFE and the organosilicon into deionized water, and mechanically stirring for 25-30min at 20-25Hz;
s12, applying voltage of 5-15Kv to the liquid stirred in the step S11, wherein the duration time is 3-5min;
s13, evaporating the liquid prepared in the step S12 at 100-120 ℃ until the content of deionized water is reduced to 50-60%, and finally obtaining the electret A (1).
4. A process for preparing an antioxidant PPS filter material as defined in claim 3, wherein: 3-5% of carbon nanofiber, 2-3% of titanium dioxide nanofiber, 0.5-1% of PTFE, 3-5% of epoxy resin and 80-86% of deionized water in the electret B (2).
5. The process for preparing an antioxidant PPS filter material of claim 4, wherein: the preparation step of the electret B (2) further comprises;
s14, adding the carbon nanofiber, the titanium dioxide nanofiber, the PTFE and the epoxy resin into deionized water, and mechanically stirring for 30-50min at a stirring speed of 300-500 r/min;
s15, evaporating the liquid stirred in the step S14 at 100-110 ℃ until the moisture content is reduced to 75-80%, and finally obtaining the electret B (2).
6. The process for preparing the antioxidant PPS filter material according to claim 1, wherein the process comprises the following steps: the first surface layer (3) is composed of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is (1-2): (3-4);
the second surface layer (4) is composed of PPS and carbon nanofiber filaments, and the mass ratio of the PPS to the carbon nanofiber filaments is (3-5): (1-2);
the third surface layer (5) is composed of PPS and fine carbon fiber wires, and the mass ratio of the PPS to the fine carbon fiber wires is (3-4): (0.5-1).
7. The process for preparing the antioxidant PPS filter material according to claim 1, wherein the process comprises the following steps: the spraying pressure of the electret A (1) in the S2 is 80-100kg/cm 2 The spraying speed is 300-350 square meters per hour.
8. The process for preparing the antioxidant PPS filter material according to claim 1, wherein the process comprises the following steps: the diameter of the pricking needle in the S4 needling is 0.6-0.75mm, the needling frequency is 1500-2000/min, and the needling depth is 6-8.5mm.
9. The process for preparing the antioxidant PPS filter material according to claim 1, wherein the process comprises the following steps: and S6, shaping by adopting a heat shaping mode, heating and shaping in a dryer, wherein the heating temperature is firstly increased to 280-320 ℃, then cooled to 190-210 ℃ and shaping is carried out, and the shaping time is 12-14S.
10. An antioxidant PPS filter material prepared by the process of any one of claims 1 to 9, characterized in that: the filter layer is composed of an electret A (1), an electret B (2), a first surface layer (3), a second surface layer (4) and a third surface layer (5), wherein the electret B (2), the first surface layer (3), the electret A (1), the second surface layer (4), the electret A (1) and the third surface layer (5) are sequentially arranged from outside to inside.
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