CN114849345A - Antistatic filter material for filtering fine particles and preparation method thereof - Google Patents
Antistatic filter material for filtering fine particles and preparation method thereof Download PDFInfo
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- CN114849345A CN114849345A CN202210449341.1A CN202210449341A CN114849345A CN 114849345 A CN114849345 A CN 114849345A CN 202210449341 A CN202210449341 A CN 202210449341A CN 114849345 A CN114849345 A CN 114849345A
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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
- 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
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- 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
- B01D46/0001—Making filtering elements
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- 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
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- 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
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- 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
- B32B5/022—Non-woven fabric
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- 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
- B32B5/08—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 the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
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- 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
- B32B5/16—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 features of a layer formed of particles, e.g. chips, powder or granules
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- 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
- B32B5/22—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- 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
- B32B2262/0223—Vinyl resin fibres
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- 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
- B32B2262/04—Cellulosic plastic fibres, e.g. rayon
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- 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
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/02—Synthetic macromolecular particles
- B32B2264/0214—Particles made of materials belonging to B32B27/00
- B32B2264/0278—Polyester particles
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- 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
Abstract
The invention belongs to the technical field of filter media, and particularly relates to an anti-static filter material for filtering fine particles, which comprises a filter layer and a surface layer, wherein the filter layer consists of a first filter layer and a second filter layer, the first filter layer is non-woven base cloth, the second filter layer is a fiber filter layer, and the fiber filter layer contains anti-static particles; the surface layer is arranged on the outer surface of the second filter layer, a fiber mesh with a certain diameter is formed by blending spinning fibers, the average diameter of the fiber mesh is not smaller than that of the fibers of the second filter layer, the fibers of the surface layer are compatible with the fibers of the second filter layer, and a protective layer containing smooth particles is arranged on the surface layer far away from the second filter layer; the invention also provides a preparation method of the antistatic filter material for filtering fine particles. The invention has obvious functions of filtering, dust cleaning and static electricity prevention, is especially suitable for the static electricity prevention filtering of fine particles, has strong functionality and is beneficial to popularization and application.
Description
Technical Field
The invention belongs to the technical field of filter media, and particularly relates to an anti-static filter material for filtering fine particles and a preparation method thereof.
Background
The granule is when passing through the filter material, because the interception effect of filter material, the dust is detained by the filter material and is stayed, and along with going on of filtering process, the dust forms the dust layer on the filter material surface, and the resistance constantly increases simultaneously to influence filterable efficiency, especially when filtering tiny particle, tiny particle piles up inside the filter material space gradually, and along with filterable going on, its jam problem is more and more serious, makes tiny particle's filtration efficiency seriously reduce. In addition, the collision among the fine particles is easy to generate static electricity, and in some working occasions, especially in the industrial fields of petrochemical industry, steel smelting, coal-fired power plants, waste incineration, cement and the like, the static electricity even can cause the phenomena of combustion, explosion, local breakdown or discharge, thereby bringing about serious personal and property hidden dangers.
With the increasing of environmental quality standards, the emission control of fine particles has been gradually scheduled, so how to provide a filter material with good filtering effect, which is suitable for fine particle filtration and is antistatic, has become the focus of research, and related literature documents have been recorded and certain results have been obtained. For example, in the prior art, "an anti-static lampblack air filtering material and a preparation method thereof" with patent number CN105056631A, a polypropylene fiber, a flax fiber, an acetate fiber, and a tencel fiber are compounded as a carrier, and the filtering material has good filtering performance on lampblack by combining the fiber material and an oil absorption resin material, but the fiber component is single, a simple fabric is easy to block, the purification efficiency of the prepared anti-static lampblack air filtering material is 83.1%, and the purification effect needs to be further optimized and improved. For another example, the active powder obtained by the "electrostatic prevention oil smoke filtering material and the preparation method thereof" with the patent number of CN105113241A has a large specific surface area and a high porosity, has good filtering and purifying effects on harmful components and particle pollutants in oil smoke, and the purifying efficiency is improved to a certain extent, and the filtering efficiency reaches 95.7%.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide an anti-static filter material for filtering fine particles, which has high filtering efficiency, good anti-static performance, strong functionality, economy and practicability. In order to realize the purpose of the invention, the following technical scheme is adopted:
an antistatic filter material for fine particle filtration comprises
The filter layer is composed of a first filter layer and a second filter layer arranged on the upper surface and/or the lower surface of the first filter layer, the first filter layer is a non-woven base fabric, the second filter layer is a fiber filter layer, the second filter layer is composed of an interpenetrating network structure formed by disorderly intertwining at least one fiber, and the fiber filter layer contains antistatic particles; and
the surface layer is arranged on one side, far away from the first filter layer, of the second filter layer, the surface layer is formed by blending spinning fibers into a fiber net with a certain diameter, the fibers of the surface layer are compatible with the fibers of the second filter layer, and the average diameter of the fibers of the surface layer is not smaller than that of the fibers of the second filter layer; and a protective layer containing smooth particles is arranged on the surface layer far away from the surface of the second filter layer.
Preferably, the antistatic particles are one or more of conductive nano silver oxide, conductive nano gold oxide, conductive nano zinc oxide or conductive nano tin oxide.
Preferably, the smooth particles are one of silicone oil, fatty acid amide or polyester.
Preferably, the non-woven base fabric is one of melt-blown non-woven fabric or spun-bonded non-woven fabric.
Preferably, the fibers in the fibrous filtration layer comprise at least one of modacrylic fibers, viscose fibers, or acetate fibers.
Preferably, the fibers of the surface layer are one of modacrylic fibers, adhesive fibers or acetate fibers.
Preferably, the thickness of the filter layer is 0.1-20 μm, the thickness of the surface layer is 0.08-0.15 μm, and the thickness of the protective layer is 0.05-0.12 μm.
In order to achieve the above object, the present invention further provides a method for preparing the above antistatic filter material for fine particle filtration, comprising the steps of:
1) preparing antistatic spray liquid: weighing a certain amount of antistatic particles and a certain amount of film forming agent according to the parts by weight, and preparing into a solution;
2) preparing a filter layer: preparing a first filter layer by melt-blown or spun-bonded non-woven fabric, and then preparing a second filter layer on the upper surface and/or the lower surface of the first filter layer by blending, wherein the second filter layer has wide chemical resistance so as to prepare a filter layer;
3) preparing an antistatic structure: uniformly electrically spraying the anti-static spray liquid prepared in the step 1) onto a second filter layer, and drying under vacuum to obtain a filter layer containing anti-static particles;
4) preparing a surface layer: one of modified polyacrylonitrile fiber, adhesive fiber or acetate fiber is blended to form a fiber net with a certain diameter, namely a surface layer is formed, and then the surface layer and one side of the second filter layer, which is far away from the first filter layer, are reinforced into a whole by an interpenetrating network structure so as to connect the surface layer to the surface of the second filter layer;
5) preparing a protective layer: uniformly spraying one of silicone oil, fatty acid amide or polyester on the surface layer prepared in the step 4) away from the surface of the second filter layer, thereby preparing a protective layer containing smooth particles on the surface layer of the filter material;
6) heat setting: and (3) placing the filtering material containing the protective layer obtained in the step 5) at the temperature of 120-160 ℃ for heat setting for 24-48h to prepare the antistatic filtering material for filtering fine particles.
Preferably, the step 2) of preparing the first filter layer in the filter layer preparation comprises the following steps:
(a) flowing a fiber-forming material through a die cavity having a substantially uniform residence time;
(b) forming filament and spraying the fiber-forming material in the step (a) through a spinneret orifice;
(c) attenuating the threadlines from step (b) with air or other fluid into fibers;
(d) collecting the fibers refined in step (c) into a nonwoven web.
Preferably, the film forming agent is one of acrylic emulsion or pentanediol monoisobutyrate, and the weight ratio of the film forming agent to the antistatic particles is 1: (1-3).
Compared with the prior art, the invention has the beneficial effects that: the filter layer consisting of the first filter layer and the second filter layer is arranged, so that the filtering efficiency of fine particles is obviously improved through multiple filtering, and the filtering effect is good; the anti-static particles are arranged on the surface of the second filter layer, so that the functions of filtering, ash cleaning and anti-static of the whole structure are obvious, the first filter layer is limited to be made of non-woven fabrics, the cost is reduced, gaps among fibers are controllable, the filtering performance is further enhanced, and the application range of the filter is expanded; in addition, the surface layer of the filter material is provided with the protective layer containing the smooth particles, the arrangement of the smooth particles can relieve the blocking and intercepting conditions of the filter material in the descending process of particle filtration, the effect of improving the filtration efficiency is achieved by promoting the lubrication of the particles and the surface of the filter material, the removal of impurities on the surface of the filter material can be promoted after the filtration is finished, and the filter material is high in functionality.
Drawings
FIG. 1 is a schematic front view showing the structure of an antistatic filter material for fine particle filtration according to example 1 of the present invention;
FIG. 2 is a schematic front view showing the structure of an antistatic filter material for fine particle filtration in accordance with example 2 of the present invention;
FIG. 3 is a flow chart showing a method for preparing an antistatic filter material for fine particle filtration according to the present invention;
FIG. 4 is a flow chart of a method of making a first filter layer according to the present invention;
in the figure, 1-filter layer, 101-first filter layer, 102-second filter layer, 2-surface layer, 3-protective layer, 4-antistatic particle, 5-smooth particle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Detailed description of the preferred embodiment 1
Fig. 1 is a schematic front view showing a structure of an antistatic filter material for fine particle filtration according to an embodiment 1 of the present invention, and it can be seen that the antistatic filter material for fine particle filtration according to the present invention includes a filter layer 1 and a surface layer 2.
The filter layer 1 of the present invention is composed of a first filter layer 101 and a second filter layer 102 disposed on the upper surface of the first filter layer 101, the first filter layer 101 is a non-woven fabric base fabric, i.e., a melt-blown non-woven fabric, the second filter layer 102 is a fiber filter layer, which is composed of an interpenetrating network structure formed by disorderly intertwining at least one fiber, in this embodiment, the fiber in the fiber filter layer includes a modified polyacrylonitrile fiber and an adhesive fiber, and the fiber filter layer contains antistatic particles 4, i.e., conductive nano silver oxide, which play a role of antistatic.
The surface layer 2 is arranged on one side, far away from the first filter layer 101, of the second filter layer 102, the surface layer 2 is formed by spinning fibers through blending to form a fiber net with a certain diameter, specifically, the fibers of the surface layer 2 are modacrylic fibers, and the fibers of the surface layer 2 are compatible with the fibers of the second filter layer 102, so that the structures are fused and a better filtering effect is exerted, and the average diameter of the fibers of the surface layer 2 is larger than that of the fibers of the second filter layer 102, so that the effects of multiple filtering and deep impurity removal are achieved; the surface far away from the second filter layer 102 on the surface layer 2 is also provided with a protective layer 3 containing smooth particles 5, the smooth particles 5 are silicone oil, and in the filtering process, the smooth particles can promote the combination of particles and the filter material, so that the filter material is efficiently filtered and discharged, the filtering efficiency is improved, and after the filter material is used, the removal of impurities on the surface of the filter material is promoted, and the filter material is strong in functionality and favorable for popularization and application.
In this embodiment, specifically, the thickness of the filter layer 1 is 0.1 μm, the thickness of the surface layer 2 is 0.08 μm, and the thickness of the protective layer 3 is 0.05 μm, so that the overall structure is light and thin, which is not only beneficial to saving resources, but also convenient for application, and has strong practicability.
Fig. 3 is a flow chart of a method for manufacturing an antistatic filter material for fine particle filtration according to the present invention, and referring to fig. 4, it can be seen that the method for manufacturing an antistatic filter material for fine particle filtration according to the present invention specifically includes the following steps:
step S1: preparing antistatic spray liquid: weighing a certain amount of antistatic particles and a certain amount of film forming agent according to the parts by weight, and preparing into a solution. In the step, the film forming agent is acrylic emulsion, and the weight ratio of the film forming agent to the antistatic particles is 1: 1.
step S2: preparing a filter layer: a first filter layer is prepared by melt-blowing a nonwoven fabric, and then a second filter layer is prepared on the upper surface of the first filter layer by blending (i.e., modacrylic fiber and adhesive fiber), which has extensive chemical resistance, to prepare the filter layer.
In this step, when preparing the first filter layer in the preparation of the filter layer, the fiber-forming material is first flowed through a mold cavity having a substantially uniform residence time; then the fiber-forming material is formed into filament through a spinneret orifice and is sprayed out; then using air or other fluid to thin the filament into fiber; and finally collecting the thinned fibers to form a non-woven fabric net.
Step S3: preparing an antistatic structure: and E, uniformly electrically spraying the anti-static liquid spray prepared in the step S1 onto the second filter layer, and drying under vacuum to obtain the filter layer containing the anti-static particles.
Step S4: preparing a surface layer: the modified polyacrylonitrile fiber is blended to form a fiber net with a certain diameter, namely a surface layer is formed, and then the surface layer and one side of the second filter layer, which is far away from the first filter layer, are reinforced into a whole by an interpenetrating network structure so as to connect the surface layer to the surface of the second filter layer.
Step S5: preparing a protective layer: silicone oil is uniformly sprayed onto the surface layer prepared in step S4 away from the surface of the second filter layer, thereby preparing a protective layer containing smooth particles on the surface layer of the filter material.
Step S6: heat setting: and (4) placing the filtering material containing the protective layer obtained in the step (S5) at 120 ℃ for heat setting for 48h to obtain the antistatic filtering material for filtering fine particles, and performing a filtering and purifying experiment on the antistatic filtering material to obtain the filtering efficiency of PM0.3 of 99.98%.
Specific example 2
Fig. 2 is a schematic front view showing the structure of an antistatic filter material for fine particle filtration according to an embodiment 2 of the present invention, and it can be seen that the antistatic filter material for fine particle filtration according to the present invention includes a filter layer 1 and a surface layer 2.
The filter layer 1 of the present invention is composed of a first filter layer 101 and a second filter layer 102 disposed on the upper surface and the lower surface of the first filter layer 101, the first filter layer 101 is a non-woven fabric base fabric, i.e., a spun-bonded non-woven fabric, the second filter layer 102 is a fiber filter layer, which is composed of an interpenetrating network structure formed by disorderly intertwining at least one fiber, in this embodiment, the fiber in the fiber filter layer includes adhesive fiber and acetate fiber, and the fiber filter layer contains antistatic particles 4, i.e., a mixture of conductive nano gold oxide and conductive nano zinc oxide, which plays a role of antistatic.
The surface layer 2 is arranged on one side, far away from the first filter layer 101, of the second filter layer 102, the surface layer 2 is formed into a fiber net with a certain diameter by blending spinning fibers, specifically, the fibers of the surface layer 2 are adhesive fibers, and the fibers of the surface layer 2 are compatible with the fibers of the second filter layer 102, so that the structures are fused together and a better filtering effect is achieved, and the average diameter of the fibers of the surface layer 2 is larger than that of the fibers of the second filter layer 102, so that the effects of multiple filtering and deep impurity removal are achieved; the surface far away from the second filter layer 102 on the surface layer 2 is also provided with a protective layer 3 containing smooth particles 5, the smooth particles 5 are fatty acid amide, and in the filtering process, the smooth particles can promote the combination of particles and the filter material, so that the filtering discharge is realized efficiently, the filtering efficiency is improved, and the removal of impurities on the surface of the filter material can be promoted after the filter material is used, and the filter material is strong in functionality and beneficial to popularization and application.
In this embodiment, specifically, the thickness of the filter layer 1 is 20 μm, the thickness of the surface layer 2 is 0.15 μm, the thickness of the protective layer 3 is 0.12 μm, and the overall structure is light and thin, which is not only beneficial to saving resources, but also convenient for application, and has strong practicability.
Fig. 3 is a flow chart of a method for manufacturing an antistatic filter material for fine particle filtration according to the present invention, and referring to fig. 4, it can be seen that the method for manufacturing an antistatic filter material for fine particle filtration according to the present invention specifically includes the following steps:
step S1: preparing antistatic spray liquid: weighing a certain amount of antistatic particles and a certain amount of film forming agent according to the parts by weight, and preparing into a solution. In the step, the film forming agent is pentanediol monoisobutyrate, and the weight ratio of the film forming agent to the antistatic particles is 1: 3.
step S2: preparing a filter layer: the first filter layer is made by spun-bonding a scrim and then the second filter layer is made by blending (i.e., adhesive fibers and acetate fibers) on the upper and lower surfaces of the first filter layer, with extensive chemical resistance, to make the filter layer.
In this step, when preparing the first filter layer in the preparation of the filter layer, the fiber-forming material is first flowed through a mold cavity having a substantially uniform residence time; then the fiber-forming material is formed into filament through a spinneret orifice and is sprayed out; then using air or other fluid to thin the filament into fiber; and finally collecting the thinned fibers to form a non-woven fabric net.
Step S3: preparing an antistatic structure: and E, uniformly electrically spraying the anti-static liquid spray prepared in the step S1 onto the second filter layer, and drying under vacuum to obtain the filter layer containing the anti-static particles.
Step S4: preparing a surface layer: adopt sticky fibre to form the fibre web that has certain diameter through the blending, form the top layer promptly, then with this top layer and the second filter layer on keep away from one side of first filter layer with interpenetrating network structure reinforcement as an organic whole to connect the surface layer in the surface of second filter layer.
Step S5: preparing a protective layer: the fatty acid amide is uniformly sprayed on the surface layer prepared in step S4 away from the surface of the second filter layer, thereby preparing a protective layer containing smooth particles on the surface layer of the filter material.
Step S6: heat setting: and (4) placing the filtering material containing the protective layer obtained in the step (S5) at 160 ℃ for heat setting for 24 hours to obtain the antistatic filtering material for filtering fine particles, and performing a filtering and purifying experiment on the antistatic filtering material to obtain the filtering efficiency of PM0.3 of 99.99%.
Specific example 3
The invention relates to an antistatic filter material for filtering fine particles, which comprises a filter layer 1 and a surface layer 2.
The filter layer 1 of the present invention is composed of a first filter layer 101 and a second filter layer 102 disposed on the lower surface of the first filter layer 101, the first filter layer 101 is a non-woven fabric base fabric, i.e., a melt-blown non-woven fabric, the second filter layer 102 is a fiber filter layer, which is composed of an interpenetrating network structure formed by disorderly intertwining at least one fiber, in this embodiment, the fiber in the fiber filter layer includes a modified polyacrylonitrile fiber and an acetate fiber, and the fiber filter layer includes an antistatic particle 4, i.e., a conductive nano tin oxide, which plays a role of antistatic.
The surface layer 2 is arranged on one side, far away from the first filter layer 101, of the second filter layer 102, the surface layer 2 is formed by blending spinning fibers into a fiber net with a certain diameter, specifically, the fibers of the surface layer 2 are acetate fibers, and the fibers of the surface layer 2 are compatible with the fibers of the second filter layer 102, so that the structures are fused and a better filtering effect is exerted, the average diameter of the fibers of the surface layer 2 is equal to that of the fibers of the second filter layer 102, and the effects of multiple filtering and deep impurity removal are achieved; the surface far away from second filter layer 102 on top layer 2 still is equipped with the inoxidizing coating 3 that contains smooth particle 5, and this smooth particle 5 is polyester, and in filtering process, smooth particle both can promote the combination of granule and this filtering material to high efficiency filters the discharge, has improved filtration efficiency, can promote again after the use is accomplished the cleaing away of this filtering material surface impurity, and is functional strong, is favorable to promoting and is used.
In this embodiment, specifically, the thickness of the filter layer 1 is 10 μm, the thickness of the surface layer 2 is 0.12 μm, the thickness of the protective layer 3 is 0.08 μm, and the overall structure is light and thin, which is not only beneficial to saving resources, but also convenient for application, and has strong practicability.
Fig. 3 is a flow chart of a method for manufacturing an antistatic filter material for fine particle filtration according to the present invention, and referring to fig. 4, it can be seen that the method for manufacturing an antistatic filter material for fine particle filtration according to the present invention specifically includes the following steps:
step S1: preparing antistatic spray liquid: weighing a certain amount of antistatic particles and a certain amount of film forming agent according to the parts by weight, and preparing into a solution. In the step, the film forming agent is acrylic emulsion, and the weight ratio of the film forming agent to the antistatic particles is 1: 2.
step S2: preparing a filter layer: the first filter layer is prepared by melt-blown non-woven fabric, and then the second filter layer is prepared by blending (namely, modified polyacrylonitrile fiber and acetate fiber) on the lower surface of the first filter layer, so that the filter layer has wide chemical resistance.
In this step, when preparing the first filter layer in the preparation of the filter layer, the fiber-forming material is first flowed through a mold cavity having a substantially uniform residence time; then the fiber-forming material is formed into filament through a spinneret orifice and is sprayed out; then using air or other fluid to thin the filament into fiber; and finally collecting the thinned fibers to form a non-woven fabric net.
Step S3: preparing an antistatic structure: and E, uniformly electrically spraying the anti-static liquid spray prepared in the step S1 onto the second filter layer, and drying under vacuum to obtain the filter layer containing the anti-static particles.
Step S4: preparing a surface layer: the acetate fiber is blended to form a fiber net with a certain diameter, namely a surface layer is formed, and then the surface layer and one side of the second filter layer, which is far away from the first filter layer, are reinforced into a whole in an interpenetrating network structure so as to connect the surface layer to the surface of the second filter layer.
Step S5: preparing a protective layer: polyester is uniformly sprayed on the surface layer prepared in step S4 away from the surface of the second filter layer, thereby preparing a protective layer containing smooth particles on the surface layer of the filter material.
Step S6: heat setting: and (4) placing the filtering material containing the protective layer obtained in the step (S5) at 130 ℃ for heat setting for 30h to obtain the antistatic filtering material for filtering fine particles, and carrying out a filtering and purifying experiment on the antistatic filtering material to obtain the filtering efficiency of PM0.3 of 99.99%.
As can be seen from the above embodiments of the present invention, the filter layer composed of the first filter layer and the second filter layer is provided, so that the filtering efficiency of fine particles is significantly improved through multiple filtering, and the filtering effect is good; the anti-static particles are arranged on the surface of the second filter layer, so that the functions of filtering, ash cleaning and anti-static of the whole structure are obvious, the first filter layer is limited to be made of non-woven fabrics, the cost is reduced, gaps among fibers are controllable, the filtering performance is further enhanced, and the application range of the filter is expanded; in addition, the surface layer of the filter material is provided with the protective layer containing the smooth particles, the arrangement of the smooth particles can relieve the blocking and intercepting conditions of the filter material in the descending process of particle filtration, the effect of improving the filtration efficiency is achieved by promoting the lubrication of the particles and the surface of the filter material, the removal of impurities on the surface of the filter material can be promoted after the filtration is finished, and the filter material is high in functionality.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the changes or modifications within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a fine particle filters uses prevents static filtering material which characterized in that: comprises that
The filter layer (1) is composed of a first filter layer (101) and a second filter layer (102) arranged on the upper surface and/or the lower surface of the first filter layer (101), the first filter layer (101) is a non-woven base fabric, the second filter layer (102) is a fiber filter layer, the second filter layer (102) is composed of an interpenetrating network structure formed by disorderly intertwining at least one fiber, and the fiber filter layer contains antistatic particles (4); and
the surface layer (2) is arranged on one side, far away from the first filter layer (101), of the second filter layer (102), the surface layer (2) is formed by blending spinning fibers into a fiber net with a certain diameter, the fibers of the surface layer (2) are compatible with the fibers of the second filter layer (102), and the average diameter of the fibers of the surface layer (2) is not smaller than that of the fibers of the second filter layer (102); and a protective layer (3) containing smooth particles (5) is arranged on the surface layer (2) far away from the surface of the second filter layer (102).
2. The antistatic filter material for filtering fine particles as claimed in claim 1, wherein: the antistatic particles (4) are one or more of conductive nano silver oxide, conductive nano gold oxide, conductive nano zinc oxide or conductive nano tin oxide.
3. The antistatic filter material for filtering fine particles as claimed in claim 1, wherein: the smooth particles (5) are one of silicone oil, fatty acid amide or polyester.
4. The antistatic filter material for filtering fine particles as claimed in claim 1, wherein: the non-woven fabric base cloth is one of melt-blown non-woven fabric or spun-bonded non-woven fabric.
5. The antistatic filter material for filtering fine particles as claimed in claim 1, wherein: the fibers in the fibrous filtration layer comprise at least one of modacrylic fibers, adhesive fibers, or acetate fibers.
6. The antistatic filter material for filtering fine particles as claimed in claim 1 or 5, wherein: the fiber of the surface layer (2) is one of modified polyacrylonitrile fiber, adhesive fiber or acetate fiber.
7. The antistatic filter material for filtering fine particles as claimed in claim 1, wherein: the thickness of the filter layer (1) is 0.1-20 μm, the thickness of the surface layer (2) is 0.08-0.15 μm, and the thickness of the protective layer (3) is 0.05-0.12 μm.
8. A method for producing an antistatic filter material for fine particle filtration as claimed in any one of claims 1 to 7, characterized in that: the method comprises the following steps:
1) preparing antistatic spray liquid: weighing a certain amount of antistatic particles and a certain amount of film forming agent according to the parts by weight, and preparing into a solution;
2) preparing a filter layer: preparing a first filter layer by melt-blown or spun-bonded non-woven fabric, and then preparing a second filter layer on the upper surface and/or the lower surface of the first filter layer by blending to prepare a filter layer;
3) preparing an antistatic structure: uniformly electrically spraying the anti-static spray liquid prepared in the step 1) onto a second filter layer, and drying under vacuum to obtain a filter layer containing anti-static particles;
4) preparing a surface layer: one of modified polyacrylonitrile fiber, adhesive fiber or acetate fiber is blended to form a fiber net with a certain diameter, namely a surface layer is formed, and then the surface layer and one side of the second filter layer, which is far away from the first filter layer, are reinforced into a whole by an interpenetrating network structure so as to connect the surface layer to the surface of the second filter layer;
5) preparing a protective layer: uniformly spraying one of silicone oil, fatty acid amide or polyester on the surface layer prepared in the step 4) away from the surface of the second filter layer, thereby preparing a protective layer containing smooth particles on the surface layer of the filter material;
6) heat setting: and (3) placing the filtering material containing the protective layer obtained in the step 5) at the temperature of 120-160 ℃ for heat setting for 24-48h to prepare the antistatic filtering material for filtering fine particles.
9. The method for producing an antistatic filter material for fine particle filtration according to claim 8, wherein: the step 2) of preparing the first filter layer in the filter layer preparation comprises the following steps:
(a) flowing a fiber-forming material through a die cavity having a substantially uniform residence time;
(b) forming filament and spraying the fiber-forming material in the step (a) through a spinneret orifice;
(c) attenuating the threadlines from step (b) with air or other fluid into fibers;
(d) collecting the fibers refined in step (c) into a nonwoven web.
10. The method for producing an antistatic filter material for fine particle filtration according to claim 8, wherein: the film forming agent is one of acrylic emulsion or pentanediol monoisobutyrate, and the weight ratio of the film forming agent to the antistatic particles is 1: (1-3).
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