CN112143412B - Air filtering material capable of being washed repeatedly and preparation method thereof - Google Patents

Air filtering material capable of being washed repeatedly and preparation method thereof Download PDF

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Publication number
CN112143412B
CN112143412B CN202011028073.3A CN202011028073A CN112143412B CN 112143412 B CN112143412 B CN 112143412B CN 202011028073 A CN202011028073 A CN 202011028073A CN 112143412 B CN112143412 B CN 112143412B
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melt
parts
air filter
filter material
polytetrafluoroethylene
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CN112143412A (en
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杨东昇
王建成
毛祥东
王波
和妍春
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Dinair Development AB
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Dinair Development AB
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/08—Copolymers of ethene
    • C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C09J123/0853—Vinylacetate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic 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
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0032—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions using electrostatic forces to remove particles, e.g. electret filters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Filtering Materials (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses an air filtering material capable of being washed repeatedly and a preparation method thereof. Air filter material includes melt-blown fabric, polytetrafluoroethylene filtration membrane and is located melt-blown fabric with compound adhesive between the polytetrafluoroethylene filtration membrane, compound adhesive includes following component: 24-28 parts of ethylene-vinyl acetate copolymer, 17-20 parts of polymethyl methacrylate, 15-18 parts of low-density polyethylene, 9-12 parts of terpene resin, 3-6 parts of paraffin and 2-3.5 parts of dihexyl phthalate. The air filter material provided by the invention does not reduce the composite strength after being washed for many times, and still has higher filtering efficiency and lower air resistance. In addition, the invention also provides a preparation method of the air filtering material, and the preparation method is simple and efficient to operate and easy for automatic production.

Description

Air filtering material capable of being washed repeatedly and preparation method thereof
Technical Field
The invention relates to the field of air filter materials, in particular to an air filter material capable of being washed repeatedly and a preparation method thereof.
Background
The melt-blown fabric, also called melt-blown non-woven fabric, is produced by using polypropylene granules as main material and through the continuous steps of high-temperature melting, spinning, hot air drafting, lapping and collecting. The melt-blown fabric contains a large amount of self-bonding and randomly distributed superfine fibers, so that a large amount of pores are formed between the fibers, extremely good filtering efficiency is achieved, the diameter of the superfine fibers is between 1-2 mu m, the pore diameter is between 0.1-0.5 mu m, if the particle diameter is larger than the melt-blown fabric pores, the superfine fibers can be directly blocked by the fibers, and when the particle diameter is smaller than the melt-blown fabric pores, the superfine fibers are easily adsorbed by electret static electricity of the fibers, so that the melt-blown fabric shows better filtering efficiency to air particles with various particle sizes. In addition, the melt-blown fabric has the characteristics of good shielding property, heat insulation property and oil absorption property, white appearance, smoothness, softness, more gaps, fluffy structure, good crease resistance and the like, so that the melt-blown fabric can be used in the fields of air, liquid filtering materials, isolating materials, absorbing materials, mask materials, heat-insulating materials, oil absorption materials, wiping cloth and the like.
Currently, various industrial or domestic air purification devices usually use composite materials containing melt-blown cloth, polytetrafluoroethylene filter membranes, etc. as filter components, such as air purifiers, fresh air systems, air conditioning systems, purification engineering systems, etc. The composite materials are mostly not washable and reusable after the dust particles in the air are blocked to reach the service life, and the reasons include that the adhesive force among filtering membranes is reduced after cleaning, the structural strength of the composite materials is reduced, all the layers are easy to peel off, electrostatic charges stored in melt-blown cloth are taken away by water cleaning, the adsorption and capture capacity of ultrafine particles is reduced, and the like. This results in a great waste of resources and the waste composite material requires an additional harmless treatment process, which otherwise increases the burden on the environment.
Accordingly, there is a need in the art to develop a filter material that can be washed with water multiple times without significantly reducing the efficiency of air filtration.
Disclosure of Invention
[ problem ] to
In view of the shortcomings of the prior art, an object of the present invention is to provide a repeatedly washable air filter material, which does not reduce the composite strength after being washed with water for many times, and still has high filtering efficiency and low air resistance.
The invention also aims to provide the preparation method of the air filtering material, which is simple and efficient to operate and easy for automatic production.
[ solution ]
In order to achieve the above object, according to one aspect of the present invention, there is provided a re-washable air filter material including a meltblown fabric, a Polytetrafluoroethylene (PTFE) filter membrane, and a composite adhesive between the meltblown fabric and the PTFE filter membrane, the composite adhesive including the following components:
Figure BDA0002702741630000021
in the present invention, the meltblown fabric and the polytetrafluoroethylene filter membrane are compounded together by the composite adhesive, thereby obtaining the water-washable air filter material according to the present invention. Wherein the composite adhesive can provide suitable adhesion, so that the air filter material can still maintain enough composite strength without peeling after multiple water washes. And the composite adhesive has weak elasticity and frictional electrification property, so that when air filtration is carried out, the air flow passing through the filter material can drive the fibers on the surface of the melt-blown cloth to rub with the composite adhesive and the polytetrafluoroethylene filter membrane, static electricity is continuously generated, the adsorption of superfine air particles is maintained, and the static charge loss caused by washing the filter material is compensated. Furthermore, the air filter material according to the invention also has a low air resistance.
Further, the composite adhesive also comprises 0.7-1.8 parts by weight of 2, 6-di-tert-butyl-p-cresol (BHT). The 2, 6-di-tert-butyl-p-cresol is an antioxidant, so that the oxidation degree of the composite adhesive during high-temperature coating can be effectively reduced, and the performance of the composite adhesive is ensured.
Further, the melt-blown fabric is polypropylene melt-blown fabric, and has a fiber diameter of 3 to 5 μm and a thickness of 0.1 to 0.5 mm.
Further, the polytetrafluoroethylene filter membrane has a pore size of 0.02-0.2 μm and a thickness of 0.1-0.5 mm.
Further, in the air filter material, the thickness of the composite adhesive is 6-9 μm.
According to another aspect of the present invention, there is provided a method for preparing the above-mentioned repeatedly water-washable air filter material, comprising the steps of:
(1) heating ethylene-vinyl acetate copolymer, polymethyl methacrylate and low-density polyethylene to 155-165 ℃ for melting;
(2) adding terpene resin, paraffin and dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) rolling the molten composite adhesive obtained in the step (2) onto a melt-blown fabric by a roller; and
(4) and (4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3).
In the present invention, the air filter material according to the present invention, which can be repeatedly washed with water, can be simply and quickly obtained by the above-described preparation method.
Further, 0.7-1.8 parts by weight of 2, 6-di-tert-butyl-p-cresol (BHT) is added in the step (1).
Further, the roller coating is carried out by adopting a coating roller with a smooth surface, and the temperature of the coating roller is 145-155 ℃. In the present invention, the smooth surface of the coating roll enables the composite adhesive to be uniformly coated on the surface of the meltblown fabric. Further, the molten composite adhesive obtained in the step (2) is first supported on the coating roll, and then the coating roll is brought into contact with and rolled on the meltblown fabric, thereby transferring the molten composite adhesive to the surface of the meltblown fabric, thereby achieving the roll coating.
Further, the linear speed of the roller coating is 22-26 m/min, and the dosage of the molten composite adhesive is 7-12 g/m2。
Further, the step (4) further comprises: at 0.50-0.55N/cm2The laminated polytetrafluoroethylene filter membrane and the melt-blown cloth are rolled under the pressure of (1).
[ advantageous effects ]
In conclusion, the invention has the following beneficial effects:
the repeatedly washable air filter material according to one embodiment of the present invention does not reduce the composite strength even after multiple water washes, and still has high filtration efficiency and low air resistance.
In addition, the preparation method of the air filter material capable of being repeatedly washed by water according to another embodiment of the invention is simple and efficient to operate and easy for automatic production.
Detailed Description
In order that those skilled in the art will more clearly understand the present invention, the following examples are given for further detailed description of the present invention, but it should be understood that the following examples are only preferred embodiments of the present invention, and the scope of the present invention as claimed should not be limited thereto.
Sources of materials
Melt-spraying cloth: the model TDH12 polypropylene melt-blown fabric is from Tianjin Taida clean materials Co., Ltd, and the fiber diameter is 3-5 μm and the thickness is 0.5 mm;
polytetrafluoroethylene filtration membrane: the pore diameter is 0.10-0.15 μm, the thickness is 0.2mm, and the material is purchased from Suzhou Youji New Material science and technology Limited;
ethylene-vinyl acetate copolymer (EVA) available from pioneer new materials ltd, zhanggang;
polymethyl methacrylate (PMMA) available from Shanghai Yixin engineering plastics, Inc.;
low Density Polyethylene (LDPE), available from exxonmobil chemical;
terpene resins, available from Shandong Haoyao New materials, Inc.;
paraffin wax, purchased from shenyang retita chemical industry materials ltd;
dihexyl phthalate, available from Hubei Xin Rundchemical Co., Ltd; and
2, 6-Di-tert-butyl-p-cresol (BHT), available from Jinan san Jose and chemical Co., Ltd.
< example >
Example 1
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) heating 24kg of ethylene-vinyl acetate copolymer, 20kg of polymethyl methacrylate, 17kg of low-density polyethylene and 0.9kg of 2, 6-di-tert-butyl-p-cresol to 160 ℃ for melting;
(2) adding 10kg of terpene resin, 5kg of paraffin and 2.7kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the fused composite adhesive obtained in the step (2) is coated by a smooth-surface coating roller at 150 ℃ and a linear speed of 24m/min at a speed of 9g/m2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at 0.52N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Example 2
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) heating 25kg of ethylene-vinyl acetate copolymer, 18kg of polymethyl methacrylate, 18kg of low-density polyethylene and 1.0kg of 2, 6-di-tert-butyl-p-cresol to 162 ℃ for melting;
(2) adding 9kg of terpene resin, 6kg of paraffin and 2.0kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the fused composite adhesive obtained in the step (2) is coated at a speed of 7g/m at 145 ℃ and 25m/min by a coating roller with a smooth surface2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at 0.53N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Example 3
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) heating 26kg of ethylene-vinyl acetate copolymer, 17kg of polymethyl methacrylate, 16kg of low-density polyethylene and 1.4kg of 2, 6-di-tert-butyl-p-cresol to 155 ℃ for melting;
(2) adding 11kg of terpene resin, 5kg of paraffin and 2.5kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the fused composite adhesive obtained in the step (2) is coated by a smooth-surface coating roller at the temperature of 152 ℃ and the linear speed of 26m/min at the speed of 12g/m2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at the temperature of 0.51N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Example 4
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) heating 25kg of ethylene-vinyl acetate copolymer, 19kg of polymethyl methacrylate, 15kg of low-density polyethylene and 1.5kg of 2, 6-di-tert-butyl-p-cresol to 165 ℃ for melting;
(2) adding 12kg of terpene resin, 4kg of paraffin and 2.2kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the fused composite adhesive obtained in the step (2) is coated by a coating roller with a smooth surface at the temperature of 147 ℃ and the linear speed of 22m/min, and the melting composite adhesive is coated at the speed of 10g/m2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at 0.55N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Example 5
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) heating 26kg of ethylene-vinyl acetate copolymer, 17kg of polymethyl methacrylate, 16kg of low-density polyethylene and 1.2kg of 2, 6-di-tert-butyl-p-cresol to 165 ℃ for melting;
(2) adding 11kg of terpene resin, 5kg of paraffin and 3.5kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the fused composite adhesive obtained in the step (2) is coated by a smooth-surface coating roller at the temperature of 155 ℃ and the linear speed of 23m/min, and is coated at the speed of 11g/m2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at 0.54N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Example 6
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) heating 24kg of ethylene-vinyl acetate copolymer, 18kg of polymethyl methacrylate, 18kg of low-density polyethylene and 1.6kg of 2, 6-di-tert-butyl-p-cresol to 160 ℃ for melting;
(2) adding 9kg of terpene resin, 5kg of paraffin and 3.0kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the fused composite adhesive obtained in the step (2) is coated by a smooth-surface coating roller at the temperature of 145 ℃ and the linear speed of 26m/min, and is 7g/m2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at 0.50N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Example 7
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) heating 25kg of ethylene-vinyl acetate copolymer, 20kg of polymethyl methacrylate, 16kg of low-density polyethylene and 1.8kg of 2, 6-di-tert-butyl-p-cresol to 157 ℃ for melting;
(2) adding 10kg of terpene resin, 3kg of paraffin and 3.2kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the fused composite adhesive obtained in the step (2) is coated by a smooth-surface coating roller at 150 ℃ and a linear speed of 22m/min, and the linear speed is 8g/m2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at 0.52N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Example 8
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) 28kg of ethylene-vinyl acetate copolymer, 18kg of polymethyl methacrylate, 17kg of low-density polyethylene and 0.9kg of 2, 6-di-tert-butyl-p-cresol were heated to 162 ℃ to melt;
(2) adding 10kg of terpene resin, 4kg of paraffin and 2.6kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the fused composite adhesive obtained in the step (2) is coated by a smooth-surface coating roller at the temperature of 155 ℃ and the linear speed of 24m/min, and the melting composite adhesive is coated at the speed of 10g/m2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at 0.55N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Example 9
According to the invention, the air filter material capable of being repeatedly washed by water is prepared by adopting the following preparation method:
(1) heating 26kg of ethylene-vinyl acetate copolymer, 19kg of polymethyl methacrylate, 15kg of low-density polyethylene and 0.7kg of 2, 6-di-tert-butyl-p-cresol to 155 ℃ for melting;
(2) adding 12kg of terpene resin, 3kg of paraffin and 3.4kg of dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) the molten composite adhesive obtained in the step (2) is coated by a smooth-surface coating roller at a linear speed of 25m/min at 148 ℃ and at a speed of 12g/m2The amount of the additive is rolled on the melt-blown cloth; and
(4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3) at 0.50N/cm2Is rolled under pressure of (1).
Thus, a water-washable air filter material according to the present invention was produced.
Comparative example 1
An air filter material was obtained in the same manner as in example 1, except that 22kg of ethylene-vinyl acetate copolymer, 22kg of polymethyl methacrylate, 13kg of low-density polyethylene, 1.0kg of 2, 6-di-t-butyl-p-cresol, 15kg of terpene resin, 2kg of paraffin wax and 4.0kg of dihexyl phthalate were used.
Comparative example 2
An air filter material was obtained in the same manner as in example 1, except that 30kg of ethylene-vinyl acetate copolymer, 15kg of polymethyl methacrylate, 20kg of low-density polyethylene, 1.0kg of 2, 6-di-t-butyl-p-cresol, 7kg of terpene resin, 8kg of paraffin wax and 1.0kg of dihexyl phthalate were used.
< test examples >
The air resistance, filtration efficiency and composite strength after the initial, 3-time water washing and 10-time water washing were examined for the water-washable air filter materials according to the present invention prepared in examples 1 to 9 and the air filter materials prepared in comparative examples 1 and 2.
Wherein, the air filtering materials are cut into samples of 200mm multiplied by 200mm, and the filtering area is ensured not to be less than 100cm2And the filtration efficiency and the air resistance are measured by referring to the national standard GB/T6165-2008 'high efficiency air filter performance test method efficiency and resistance' section 6.2 'sodium flame method'. In addition, the same meltblown and teflon filter membranes as in the examples of the present invention were cut to the same size as the samples and stacked to serve as blank control samples.
Further, the air filter materials obtained in examples and comparative examples were prepared as 15.0mm X200 mm samples, and the meltblown fabric and polytetrafluoroethylene filter membrane 20mm long at one end in the longitudinal direction of the samples were not combined. And respectively clamping the melt-blown cloth and the polytetrafluoroethylene filter membrane which are not compounded on the sample on two clamps, peeling at a test speed of 30mm/min, and recording the average peeling strength of each sample, namely the compound strength of each air filter material.
The results of the above tests are shown in table 1 below.
[ Table 1]
Figure BDA0002702741630000091
As can be seen from table 1 above, the water-washable air filter materials prepared according to examples 1 to 9 of the present invention maintain high filtration efficiency and composite strength, and low air resistance, even after multiple water washes.
In contrast, the filtration efficiency of the blank control after multiple washes is significantly reduced; and comparative examples 1 and 2, in which the composite adhesive outside the range defined in the present invention was used, the filtration efficiency and the composite strength were reduced after washing many times, and the air resistance was also significantly increased.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (8)

1. The utility model provides a repeatedly washable air filter material which characterized in that, includes melt-blown cloth, polytetrafluoroethylene filtration membrane and is located melt-blown cloth with compound adhesive between the polytetrafluoroethylene filtration membrane, compound adhesive includes following component:
24-28 parts by weight of an ethylene-vinyl acetate copolymer,
17 to 20 parts by weight of polymethyl methacrylate,
15 to 18 parts by weight of low density polyethylene,
9-12 parts by weight of terpene resin,
3-6 parts by weight of paraffin wax,
2 to 3.5 parts by weight of dihexyl phthalate,
0.7 to 1.8 weight portions of 2, 6-ditertbutyl-p-cresol.
2. The repeatedly washable air filter material of claim 1, wherein said meltblown fabric is polypropylene meltblown fabric and has a fiber diameter of 3-5 μm and a thickness of 0.1-0.5 mm.
3. The repeatedly washable air filter material as set forth in claim 1, wherein said polytetrafluoroethylene filter membrane has a pore size of 0.02 to 0.2 μm and a thickness of 0.1 to 0.5 mm.
4. The repeatedly washable air filter material of claim 1, wherein the thickness of said composite binder in said air filter material is 6-9 μm.
5. A method of making a re-washable air filter material as claimed in any one of claims 1 to 4, comprising the steps of:
(1) heating ethylene-vinyl acetate copolymer, polymethyl methacrylate, low-density polyethylene and 2, 6-di-tert-butyl-p-cresol to 155-165 ℃ for melting;
(2) adding terpene resin, paraffin and dihexyl phthalate into the melt obtained in the step (1), and uniformly smelting;
(3) rolling the molten composite adhesive obtained in the step (2) onto a melt-blown fabric by a roller; and
(4) and (4) superposing a polytetrafluoroethylene filter membrane on the melt-blown cloth coated with the composite adhesive obtained in the step (3).
6. The preparation method according to claim 5, wherein the roll coating is performed by using a coating roll with a smooth surface, and the temperature of the coating roll is 145-155 ℃.
7. The preparation method of claim 5, wherein the linear speed of the roller coating is 22-26 m/min, and the amount of the molten composite adhesive is 7-12 g/m2。
8. The method of claim 5, wherein the step (4) further comprises: at 0.50-0.55N/cm2The laminated polytetrafluoroethylene filter membrane and the melt-blown cloth are rolled under the pressure of (1).
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