CN115948940A - Preparation method of salt spray filter paper and salt spray filter paper - Google Patents
Preparation method of salt spray filter paper and salt spray filter paper Download PDFInfo
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- CN115948940A CN115948940A CN202211552532.7A CN202211552532A CN115948940A CN 115948940 A CN115948940 A CN 115948940A CN 202211552532 A CN202211552532 A CN 202211552532A CN 115948940 A CN115948940 A CN 115948940A
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- 239000007921 spray Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
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- 239000010410 layer Substances 0.000 claims abstract description 59
- 239000003365 glass fiber Substances 0.000 claims abstract description 49
- 239000002002 slurry Substances 0.000 claims abstract description 47
- 239000012792 core layer Substances 0.000 claims abstract description 36
- 239000002344 surface layer Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 19
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- 238000010009 beating Methods 0.000 claims abstract description 8
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- 239000004698 Polyethylene Substances 0.000 claims description 9
- 238000000889 atomisation Methods 0.000 claims description 9
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- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
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- 230000003014 reinforcing effect Effects 0.000 claims description 3
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Abstract
The invention relates to the technical field of filter paper preparation, in particular to a preparation method of salt spray filter paper and the salt spray filter paper. The method comprises the following steps: preparing a first glass fiber with a beating degree of 14-59 DEG SR and an organic fiber with a titer of 0.5-5.0 dtex in a pH value range of 2-3.5 to obtain a first slurry, and obtaining a bottom layer based on the first slurry; wherein the diameter of the first glass fiber is 0.1-7 μm; defibering organic fibers with the fineness of 0.5-5.0 dtex in a defibering machine containing a dispersing agent to obtain second slurry, and obtaining a core layer based on the second slurry; preparing second glass fibers with the beating degree of 49-59 DEG SR in the pH value range of 2-3.5 to obtain third slurry, and obtaining a surface layer based on the third slurry; wherein the diameter of the second glass fiber is 0.1-4 μm; and compounding the bottom layer, the core layer and the surface layer from bottom to top to obtain the salt spray filter paper. The invention can prepare the salt fog filter paper with the characteristics of high dust holding capacity, low resistance, high water resistance, excellent folding performance and the like.
Description
Technical Field
The invention relates to the technical field of filter paper preparation, in particular to a preparation method of salt spray filter paper and the salt spray filter paper.
Background
At present, the high-salt fog environment at sea or on the sea brings serious harm to the operation of an oil field, a nuclear power plant, a ship air conditioning equipment motor, a ventilator and an offshore wind driven generator, which not only causes the electrochemical corrosion of the equipment, but also influences the service life of the equipment. Equipment manufacturers generally adopt anti-corrosion and anti-salt-spray materials (such as metal coatings, thermal spray coatings and organic coatings) to prevent the corrosion of the surfaces of the equipment, but in some salt-spray environments, salt enters the inside of the equipment along with gas and is attached to the surfaces of the equipment under the mixing action of water vapor to generate electrochemical corrosion, so that the normal operation of the equipment is influenced by the corrosion of the equipment, and the equipment is damaged. Therefore, dehydration and desalination treatment for high salt fog air are required to protect the motor and the fan.
The glass fiber filter paper is a core material for realizing cleanliness, has wider application compared with other materials due to high filtering efficiency, better chemical and thermal stability and higher dust holding capacity, and occupies an important position in a plurality of filtering and separating materials. The glass fiber filter paper is divided into three series of coarse glass fiber filter paper (ASHRAE), medium-high efficiency glass fiber filter paper (HEPA) and ultra-high efficiency glass fiber filter paper (ULPA) according to the filtering efficiency. The salt spray filter is a high-efficiency filtering device for protecting a motor and a ventilator in a complex working environment, and is particularly suitable for a motor for field operation in coastal areas or areas with more salt spray. The salt mist filter mainly comprises a rain-proof device, a high-efficiency filter and a box body. Salt mist and impurities in the air are adsorbed by the high-efficiency filter, and clean air is blown into the motor to be cooled after being sucked by the ventilator, so that the purposes of cooling and protecting the main motor are achieved.
The air filter paper of a common salt spray filter is made of high-efficiency glass fiber filter paper, the filter paper used at present is formed by mixing single or multiple glass fibers through a wet method, and the prepared single-layer glass fiber filter paper has the conditions of low dust holding capacity, poor waterproofness, short service life and the like.
Therefore, a method for preparing a salt spray filter paper and a salt spray filter paper are needed to solve the above problems.
Disclosure of Invention
One or more embodiments of the invention describe a preparation method of salt spray filter paper and the salt spray filter paper, which can prepare the salt spray filter paper with the characteristics of high dust holding capacity, low resistance, high water resistance, excellent folding performance and the like.
In a first aspect, an embodiment of the present invention provides a method for preparing salt spray filter paper, including:
preparing a first glass fiber with a beating degree of 14-59 DEG SR and an organic fiber with a titer of 0.5-5.0 dtex in a pH value range of 2-3.5 to obtain a first slurry, and obtaining a bottom layer based on the first slurry; wherein the diameter of the first glass fiber is 0.1-7 μm;
defibering organic fibers with the fineness of 0.5-5.0 dtex in a defibering machine containing a dispersing agent to obtain second slurry, so as to obtain a core layer based on the second slurry;
preparing second glass fibers with the beating degree of 49-59 DEG SR in the pH value range of 2-3.5 to obtain third slurry, and obtaining a surface layer based on the third slurry; wherein the diameter of the second glass fiber is 0.1-4 μm;
and compounding the bottom layer, the core layer and the surface layer from bottom to top to obtain the salt spray filter paper.
According to the above embodiment, the concentration of the first slurry is 0.1 to 4.0%; and/or the presence of a gas in the gas,
the fiber content of the bottom layer accounts for 65-85% of the total amount of the salt spray filter paper.
According to the above embodiment, the organic fiber includes at least one of a polyester fiber, a polyethylene fiber, a polypropylene fiber, an aramid fiber, a nylon fiber, an acrylic fiber, a polytetrafluoroethylene fiber, and a polyvinyl alcohol fiber.
According to the above embodiment, the obtaining a bottom layer based on the first slurry includes:
sequentially carrying out pulp flushing and multi-pipe pulp distribution on the first pulp, and then carrying out net surfing molding to obtain a bottom layer to be reinforced;
and reinforcing and modifying the bottom layer to be reinforced by adopting an overflow sizing mode to obtain the bottom layer.
According to the embodiment, the overflow sizing mode selects a binder and a waterproof agent for uniform dispersion, the binder is aqueous acrylic resin emulsion, and the waterproof agent comprises fluorocarbon and silicone oil;
the adhesive comprises adhesives A and B, the waterproof agent comprises a waterproof agent X, and the adhesive A, the adhesive B and the waterproof agent X are mixed according to the ratio of 5:1:2, and the concentration of the binder and the waterproofing agent is 2.5%.
According to the above embodiment, the concentration of the second slurry is 0.05 to 0.5%; and/or the presence of a gas in the gas,
the fiber content of the core layer accounts for 1-5% of the total amount of the salt spray filter paper.
According to the above embodiment, the concentration of the third slurry is 0.1 to 4.0%; and/or the presence of a gas in the gas,
the fiber content of the surface layer accounts for 15-30% of the total amount of the salt spray filter paper.
According to the above embodiment, the obtaining a core layer based on the second slurry includes:
sequentially carrying out pulp flushing and multi-pipe pulp distribution on the second slurry, and then carrying out net feeding molding to obtain a core layer;
and/or the presence of a gas in the gas,
obtaining a surface layer based on the third slurry, including:
and sequentially carrying out pulp flushing and multi-pipe pulp distribution on the third slurry, and then carrying out net surfing molding to obtain the surface layer.
According to the embodiment, the step of compounding the bottom layer, the core layer and the surface layer from bottom to top to obtain the salt spray filter paper comprises the following steps:
compounding the bottom layer, the core layer and the surface layer from bottom to top;
and carrying out atomization sizing treatment and vacuum suction on the compounded material in sequence to obtain the salt spray filter paper.
In a second aspect, an embodiment of the present invention provides a salt spray filter paper prepared by the preparation method described in any one of the above embodiments.
According to the preparation method of the salt spray filter paper and the salt spray filter paper provided by the embodiment of the invention, the raw materials mainly comprise glass fibers and a plurality of organic fibers as auxiliaries, and the three-folded-net forming process is adopted, so that the prepared filter material has the characteristics of high dust holding capacity, low resistance, high water resistance, excellent folding performance and the like.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions in the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a schematic flow diagram of a method of making a salt spray filter paper according to an embodiment;
FIG. 2 shows a schematic structural diagram of the salt spray filter paper prepared according to the process shown in FIG. 1.
Reference numerals:
1-a bottom layer;
2-a core layer;
and 3-surface layer.
Detailed Description
The scheme provided by the invention is described below by combining the accompanying drawings.
Fig. 1 shows a flow diagram of a method of making a salt spray filter paper according to an embodiment. As shown in fig. 1, the preparation method of the salt spray filter paper comprises the following steps:
100, preparing a first glass fiber with a beating degree of 14-59 DEG SR and an organic fiber with a titer of 0.5-5.0 dtex within a pH value range of 2-3.5 to obtain a first slurry, and obtaining a bottom layer based on the first slurry; wherein the diameter of the first glass fiber is 0.1-7 μm;
102, defibering organic fibers with the titer of 0.5-5.0 dtex in a defibering machine containing a dispersing agent to obtain second slurry, so as to obtain a core layer based on the second slurry;
104, mixing second glass fibers with the beating degree of 49-59 DEG SR in the pH value range of 2-3.5 to obtain third slurry, and obtaining a surface layer based on the third slurry; wherein the diameter of the second glass fiber is 0.1-4 μm;
and 106, compounding the bottom layer, the core layer and the surface layer from bottom to top to obtain the salt spray filter paper.
In the embodiment, the raw materials mainly comprise glass fibers and the auxiliary materials comprise various organic fibers, and the three-lapping forming process is adopted, so that the prepared filter material has the characteristics of high dust holding capacity, low resistance, high water resistance, excellent folding performance and the like.
In one embodiment of the invention, the concentration of the first slurry is 0.1 to 4.0%.
In one embodiment of the invention, the fiber content of the bottom layer is 65-85% of the total amount of the salt spray filter paper.
In one embodiment of the present invention, the organic fiber includes at least one of a polyester fiber, a polyethylene fiber, a polypropylene fiber, an aramid fiber, a nylon fiber, an acrylic fiber, a polytetrafluoroethylene fiber, and a polyvinyl alcohol fiber.
In some embodiments, the core layer is made of low-melting/high-melting organic fibers, and the low-melting fiber layer is melted in the drying part to enable the glass fibers to be bonded with the organic fibers, so that the folding performance of the filter material is improved.
In an embodiment of the present invention, the step of "obtaining a bottom layer based on the first slurry" may specifically include:
sequentially carrying out pulp flushing and multi-pipe pulp distribution on the first pulp, and then carrying out net surfing molding to obtain a bottom layer to be reinforced;
and (3) performing enhancement modification on the bottom layer to be enhanced by adopting an overflow sizing mode to obtain the bottom layer.
In the embodiment, the bottom layer is cured and crosslinked by overflow sizing, and the high waterproof performance makes the bottom layer more easily adaptive to high-salt-mist and high-humidity environments.
In one embodiment of the invention, the overflow sizing mode selects a binder and a waterproof agent for uniform dispersion, the binder is aqueous acrylic resin emulsion, and the waterproof agent comprises fluorocarbon and silicone oil;
the adhesive comprises adhesives A and B, the waterproof agent comprises a waterproof agent X, and the adhesive A, the adhesive B and the waterproof agent X are mixed according to the ratio of 5:1:2, the concentration of the binder and the waterproofing agent is 2.5%.
In one embodiment of the invention, the concentration of the second slurry is 0.05 to 0.5%; and/or the presence of a gas in the gas,
the fiber content of the core layer accounts for 1-5% of the total amount of the salt spray filter paper.
In one embodiment of the invention, the concentration of the third slurry is 0.1 to 4.0%.
In one embodiment of the invention, the fiber content of the facing layer is 15-30% of the total amount of the salt spray filter paper.
In an embodiment of the present invention, the step of "obtaining the core layer based on the second slurry" may specifically include:
and sequentially carrying out pulp flushing and multi-pipe pulp distribution on the second slurry, and then carrying out net surfing molding to obtain the core layer.
In an embodiment of the present invention, the step of obtaining the surface layer based on the third slurry may specifically include:
and sequentially carrying out size washing and multi-pipe size distribution on the third size, and then carrying out net surfing molding to obtain the surface layer.
In an embodiment of the present invention, the step of combining the bottom layer, the core layer, and the top layer in order from bottom to top to obtain the salt spray filter paper may specifically include:
compounding the bottom layer, the core layer and the surface layer in the order from bottom to top;
and (4) sequentially carrying out atomization sizing treatment and vacuum suction on the compounded material to obtain the salt spray filter paper.
In this embodiment, the surface course adopts the atomizing sizing, gives high-efficient filter layer certain intensity and waterproof performance, avoids breaking a book fracture, material layering.
In summary, the salt spray filter paper with the characteristics of high dust holding capacity, low resistance, high water resistance, excellent folding performance and the like can be obtained by interweaving the fine glass fibers (i.e., the second glass fibers), the organic fibers and the coarse glass fibers (i.e., the first glass fibers, although the first glass fibers can also comprise the fine glass fibers except the coarse glass fibers, which are not limited herein), and then carrying out reinforcing modification on the binder and the waterproof agent, and then drying and curing. That is to say, the salt spray filter paper with the sandwich structure has high dust holding capacity while considering waterproofness due to the fact that the salt spray filter paper with the sandwich structure has the thick glass fiber layer with high waterproofness; the organic fiber provides flexibility and excellent folding performance for the material, so that the filtering resistance of the folded filter paper is reduced; the fine glass fiber layer is a high-efficiency filter layer, and the integral filtering efficiency of the filter paper is ensured. The salt mist filtering material with the sandwich structure has the characteristics of high dust holding capacity, high waterproofness and excellent folding performance, and has wide application prospects.
In addition, the embodiment of the invention also provides salt spray filter paper which is prepared by adopting the preparation method of the salt spray filter paper in any embodiment. That is, the salt spray filter paper with the characteristics of high dust holding capacity, low resistance, high water resistance, excellent folding performance and the like can be prepared through the process shown in fig. 1 (the specific structure can be seen in fig. 2). As shown in figure 2, the structure of the salt spray filter paper comprises a bottom layer 1, a core layer and a surface layer 3 which are sequentially connected from bottom to top.
It can be understood that the salt spray filter paper of the present embodiment and the salt spray filter paper of the above embodiments belong to the same inventive concept, and therefore, the salt spray filter paper and the salt spray filter paper have the same beneficial effects, and are not described herein again.
The technical solution of the present invention is described below with reference to three embodiments.
Example 1:
(1) Preparing a bottom layer: preparing a bottom wet paper web by adopting 14-degree SR, 49-degree SR and 7-micron glass fiber cotton together with high-strength organic fiber AD, wherein the pulping concentration is 1.0%, the pulping pH is 2.5, performing pulp flushing and net feeding molding, and then entering an overflow sizing working section, wherein the binding agents A and B and a waterproof agent X are prepared according to the ratio of 5:1:2, the glue concentration is 2.5 percent;
(2) Preparing a core layer: the organic fiber of the core layer is defibered in a defibering machine containing a dispersing agent, the concentration is 0.1%, the organic fiber is in a PE/PET double-layer structure, wherein the melting point of PE is 90 ℃, and the melting point of PET is 260 ℃;
(3) Preparing a surface layer: the surface layer is prepared by 49-degree SR fine glass fiber, the pulping concentration is 1.0%, and the pulping pH is 2.5;
(4) Three layers are compounded: laminating three layers of paper webs after three overlapping nets, and performing atomization sizing treatment on a surface layer, wherein the binder A comprises a binder B, a waterproof agent X is 4:2:1, glue concentration is 1.0%, and paper webs with a sandwich structure after glue application are closely interwoven together through vacuum suction;
(5) And (3) drying: drying the filter material after atomization and sizing in a plurality of groups of drying cylinders at the temperature of 100-160 ℃, and carrying out curing and crosslinking reaction on the binder and the waterproofing agent, the glass fiber and the organic fiber; melting the low-melting-point organic fiber, and tightly bonding the low-melting-point organic fiber with the glass fiber;
(6) The fiber proportion of each layer in the filter paper is surface layer: core layer: bottom layer =20:5:75, the glue application amount is 3.2%.
Example 2:
(1) Preparing a bottom layer: preparing a bottom wet paper web by using 19-degree SR, 49-degree SR and 7-micron glass fiber cotton together with high-strength organic fiber AD, wherein the pulping concentration is 1.0%, the pulping pH is 2.5, performing pulp flushing and net feeding molding, and then entering an overflow sizing working section, wherein the binding agents A and B and a waterproof agent X are prepared according to the ratio of 5:1:2, the glue concentration is 2.5 percent;
(2) Preparing a core layer: the organic fiber of the core layer is defibered in a defibering machine containing a dispersing agent, the concentration is 0.1%, the organic fiber is in a PE/PET double-layer structure, wherein the melting point of PE is 90 ℃, and the melting point of PET is 260 ℃;
(3) Preparing a surface layer: the surface layer is prepared by adopting 49 DEG SR +54 DEG SR fine glass fiber, the pulping concentration is 1.0%, and the pulping pH is 2.5;
(4) Three layers are compounded: laminating three layers of paper webs after three overlapping nets, and performing atomization sizing treatment on a surface layer, wherein the binder A comprises a binder B, a waterproof agent X is 4:2:1, the glue concentration is 1.0%, and the paper webs with the sandwich structure after glue application are closely interwoven together through vacuum suction;
(5) Drying: drying the filter material after atomization and sizing in a plurality of groups of drying cylinders at the temperature of 100-160 ℃, and carrying out curing and crosslinking reaction on the binder and the waterproofing agent, the glass fiber and the organic fiber; melting the low-melting-point organic fiber, and tightly bonding the low-melting-point organic fiber with the glass fiber;
(6) The fiber proportion of each layer in the filter paper is surface layer: core layer: bottom layer =20:5:75, the glue application amount is 3.0%.
Example 3:
(1) Preparing a bottom layer: preparing a bottom wet paper web by adopting 19-degree SR, 49-degree SR and 7-micron glass fiber cotton together with high-strength organic fibers AD, wherein the pulping concentration is 1.0%, the pulping pH is 2.5, the bottom wet paper web enters an overflow sizing working section after pulp flushing and net surfing forming, and the binding agents A and B and the waterproofing agent X are mixed according to the ratio of 5:1:2, the glue concentration is 2.5 percent;
(2) Preparing a core layer: defibering organic fiber of the core layer in a defibering machine containing a dispersing agent, wherein the concentration of the organic fiber is 0.1%, the organic fiber is of a PE/PET double-layer structure, the melting point of PE at the outer layer is 90 ℃, and the melting point of PET at the core layer is 260 ℃;
(3) Preparing a surface layer: the surface layer is prepared by adopting 49 DEG SR +54 DEG SR fine glass fiber, the pulping concentration is 1.0%, and the pulping pH is 2.5;
(4) Three layers are compounded: laminating three layers of paper webs after three overlapping nets, and performing atomization sizing treatment on a surface layer, wherein the binder A comprises a binder B, a waterproof agent X is 4:2:1, glue concentration is 1.0%, and paper webs with a sandwich structure after glue application are closely interwoven together through vacuum suction;
(5) Drying: drying the filter material after atomization and sizing in a plurality of groups of drying cylinders at the temperature of 100-160 ℃, and carrying out curing and crosslinking reaction on the binder and the waterproofing agent, the glass fiber and the organic fiber; melting the low-melting-point organic fiber, and tightly bonding the low-melting-point organic fiber with the glass fiber;
(6) The fiber proportion of each layer in the filter paper is surface layer: core layer: bottom layer =18:5:77, the sizing amount is 3.0 percent.
TABLE 1 comparison of salt spray filter paper with sandwich structure with ordinary glass fiber filter paper
The foregoing description of specific embodiments of the present invention has been presented. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (10)
1. A preparation method of salt spray filter paper is characterized by comprising the following steps:
preparing a first glass fiber with a beating degree of 14-59 DEG SR and an organic fiber with a titer of 0.5-5.0 dtex within a pH value range of 2-3.5 to obtain a first slurry, and obtaining a bottom layer based on the first slurry; wherein the diameter of the first glass fiber is 0.1-7 μm;
defibering organic fibers with the fineness of 0.5-5.0 dtex in a defibering machine containing a dispersing agent to obtain second slurry, so as to obtain a core layer based on the second slurry;
preparing second glass fiber with the beating degree of 49-59 DEG SR in the pH value range of 2-3.5 to obtain third slurry, and obtaining a surface layer based on the third slurry; wherein the diameter of the second glass fiber is 0.1-4 μm;
and compounding the bottom layer, the core layer and the surface layer from bottom to top to obtain the salt spray filter paper.
2. The method for preparing salt spray filter paper as claimed in claim 1, wherein the concentration of the first slurry is 0.1-4.0%; and/or the presence of a gas in the atmosphere,
the fiber content of the bottom layer accounts for 65-85% of the total amount of the salt spray filter paper.
3. The method for preparing salt spray filter paper according to claim 1, wherein the organic fiber comprises at least one of polyester fiber, polyethylene fiber, polypropylene fiber, aramid fiber, nylon fiber, acrylic fiber, polytetrafluoroethylene fiber and polyvinyl alcohol fiber.
4. The method for preparing salt spray filter paper as claimed in claim 1, wherein the obtaining of the bottom layer based on the first slurry comprises:
sequentially carrying out pulp flushing and multi-pipe pulp distribution on the first pulp, and then carrying out net surfing molding to obtain a bottom layer to be reinforced;
and reinforcing and modifying the bottom layer to be reinforced by adopting an overflow sizing mode to obtain the bottom layer.
5. The preparation method of the salt spray filter paper as claimed in claim 4, wherein the overflow sizing mode is to uniformly disperse a binder and a water-proofing agent, wherein the binder is an aqueous acrylic resin emulsion, and the water-proofing agent comprises fluorocarbon and silicone oil;
the adhesive comprises adhesives A and B, the waterproofing agent comprises a waterproofing agent X, and the adhesive A, the adhesive B and the waterproofing agent X are mixed according to the ratio of 5:1:2, and the concentration of the binder and the waterproofing agent is 2.5%.
6. The method for preparing salt spray filter paper as claimed in claim 1, wherein the concentration of the second slurry is 0.05-0.5%; and/or the presence of a gas in the gas,
the fiber content of the core layer accounts for 1-5% of the total amount of the salt spray filter paper.
7. The method for preparing salt spray filter paper as claimed in claim 1, wherein the concentration of the third slurry is 0.1-4.0%; and/or the presence of a gas in the gas,
the fiber content of the surface layer accounts for 15-30% of the total amount of the salt spray filter paper.
8. The method for preparing salt spray filter paper as claimed in claim 1, wherein the obtaining of the core layer based on the second slurry comprises:
sequentially carrying out pulp flushing and multi-pipe pulp distribution on the second slurry, and then carrying out net feeding molding to obtain a core layer;
and/or the presence of a gas in the atmosphere,
obtaining a surface layer based on the third slurry, including:
and sequentially carrying out pulp flushing and multi-pipe pulp distribution on the third slurry, and then carrying out net surfing molding to obtain the surface layer.
9. The method for preparing the salt spray filter paper as claimed in any one of claims 1 to 8, wherein the step of compounding the bottom layer, the core layer and the surface layer in the order from bottom to top to obtain the salt spray filter paper comprises the following steps:
compounding the bottom layer, the core layer and the surface layer in the sequence from bottom to top;
and (4) sequentially carrying out atomization sizing treatment and vacuum suction on the compounded material to obtain the salt spray filter paper.
10. A salt spray filter paper prepared by the method of any one of claims 1 to 9.
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