High-dust-holding-capacity filter paper as well as preparation method and application thereof

Abstract

The invention discloses high-dust-holding-capacity filter paper as well as a preparation method and application thereof, and belongs to the technical field of filtration. According to the high-dust-holding-capacity filter paper provided by the invention, the fibers on the inflow surface and the cationic water repellent agent are stirred and reacted together with the fibers in a pulp tank, and the surface layer can resist water after the raw paper is dried, so that resin cannot permeate the fibers on the surface layer during single-side sizing, the accurate distribution of the resin can be effectively improved, and the dust holding capacity and the water resistance of the filter paper are improved; the resin impregnation can provide physical properties for the filter paper; wherein the resin is obtained by heating, curing and molding bisphenol A epoxy resin and polyether amine D230 acrylate microspheres, and a certain high crosslinking strength and pore structure is provided for the filter material by constructing a multi-stage energy dissipation mechanism. The fiber on the surface layer of the filter paper is subjected to controllable water-resistant modification so as to accurately control the distribution of resin, and meanwhile, the resin solution is subjected to collaborative optimization, so that the high dust holding capacity, high water resistance and high strength which cannot be achieved by traditional filter paper are realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of filtration, and particularly relates to a high dust capacity filter paper and a preparation method and application thereof. BACKGROUND

[0002] In recent years, with the rapid development of industrial dust treatment, air purification and automobile filter fields, the market demand for high-efficiency filter materials continues to grow.

[0003] Traditional filter materials usually use cellulose, glass fiber or synthetic fiber, and these materials have a trade-off between dust capacity and filtration efficiency. For example, cellulose has low cost but poor wet strength, glass fiber has high efficiency but limited dust capacity, and synthetic fiber such as melt-blown polypropylene has high dust capacity but large resistance and high energy consumption. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a high dust capacity filter paper and a preparation method and application thereof.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: The first aspect of the present application is to provide a high dust capacity filter paper, which comprises an inflow surface of the high dust capacity filter paper and an outflow surface of the high dust capacity filter paper, the fiber slurry of the inflow surface of the high dust capacity filter paper is modified by a cationic water-resistant agent; resin is impregnated along the direction from the outflow surface of the high dust capacity filter paper to the inflow surface of the high dust capacity filter paper, the thickness of the resin impregnation is 50-80% of the thickness of the high dust capacity filter paper, and the remaining 20-50% of the thickness of the high dust capacity filter paper has a water-resistant agent but no resin impregnation.

[0006] It should be noted that the base paper with the cationic water-resistant agent part cannot be dried with resin impregnation, which can provide dust capacity for the high dust capacity filter paper, and the paper part impregnated with resin provides physical properties for the high dust capacity filter paper.

[0007] In some embodiments, the basis weight of the high dust capacity filter paper ranges from 60 to 200 g / m 2 , the thickness of the high dust capacity filter paper ranges from 0.1 to 2 mm, the air permeability of the high dust capacity filter paper ranges from 60 to 2000 mm / s, and the addition ratio of the cationic water-resistant agent is 1-5% of the mass of the fiber slurry.

[0008] The second aspect of the present application is to provide a method for preparing a high dust capacity filter paper, comprising: using a resin impregnation device to impregnate the filter paper base paper with resin, and performing post-drying on the resin-impregnated paper web at 0-160 DEG C; wherein the resin impregnation device comprises a screen roller, a smooth roller, a doctor blade and a glue tank, the glue tank is provided with a resin solution, the lower part of the screen roller is immersed in the resin solution, the smooth roller is arranged in pairs with the screen roller, and the smooth roller is arranged away from the glue tank, the filter paper base paper passes through the gap between the smooth roller and the screen roller, the screen roller is provided with a doctor blade on one side, and the side is the side of the screen roller rotating out of the resin solution, and the cutting edge of the doctor blade is in contact with the screen roller.

[0009] In some embodiments, the filter paper base paper is prepared by the following method: The plant fibers and / or non-plant fibers are mixed with water, dispersed by defibration, transferred to a pulp tank, diluted to a wire concentration, dehydrated and formed into a wet paper web through a double-layer headbox, and the wet paper web is subjected to a pre-drying treatment to obtain a dried paper web; wherein a cationic water repellent is added to the pulp tank of the high dust capacity filter paper.

[0010] In some embodiments, the plant fibers are selected from at least one of wood fibers, stem fibers, seed hair fibers or bast fibers; And / or, the non-plant fibers include inorganic fibers or chemical fibers; And / or, the wire concentration is 0.01-0.5%; And / or, the pre-drying is drying at 0-160 DEG C.

[0011] In some embodiments, the resin solution is prepared by the following steps: S1: adding bisphenol A type epoxy resin, polyether amine D230 and catalyst, and reacting at 85 DEG C for 1-2 h under inert gas protection, to obtain a modified epoxy resin; S2: putting the acrylic ester microspheres into a plasma treatment machine with a frequency of 13-15 MHz, treating for 3-5 min under an argon flow of 20-30 sccm and a power of 200-230 W, then mixing with a silane coupling agent and a solvent, and impregnating and drying to obtain silanized acrylic ester microspheres; S3: mixing the modified epoxy resin and the mixed solvent to form a base; S4: sequentially adding the silanized acrylic ester microspheres and a dispersant to the base and mixing; S5: heating the mixed system obtained in S4 at 70-80 DEG C for 8-15 min to solidify and form a resin solution.

[0012] It needs to be explained that the bisphenol A type epoxy resin contains multiple epoxy groups, the polyetheramine D230 has primary amine at both ends and polypropylene oxide (PPO) flexible chain segment in the middle, the two primary amine groups of D230 molecule can react with two epoxy groups respectively to generate beta-hydroxyl amine, forming a crosslinking network, thereby improving the impact resistance of the product, reducing the shrinkage stress, and effectively avoiding the subsequent microspheres from being extruded and broken; the beta-hydroxyl amine group is preferentially adsorbed on the fiber surface, preventing the resin from completely blocking the fiber gap and improving the effective dust holding area.

[0013] In some embodiments, the resin solution comprises the following components by mass fraction: bisphenol A type epoxy resin 50-55 parts, polyetheramine D230 20-30 parts, and acrylic ester microspheres 10-15 parts; the mass ratio of the acrylic ester microspheres to the silane coupling agent is 1.5-2:1.

[0014] It needs to be explained that the particle size of the acrylic ester microspheres is 20-30 μm, and a stable cavity can be formed inside, which significantly reduces the material density; the particle size of the microspheres, the resin shrinkage hole and the fiber gap form a three-level pore network, delaying the formation of the filter cake layer; in addition, the amino group (-NH2) of the silane coupling agent (such as KH-550) forms an amide bond with the carboxyl group on the surface of the acrylic ester microspheres, and the siloxane group (-Si-O-) reacts with the epoxy group of the resin to construct a covalent bond interface, overcoming the problem of phase separation that easily occurs when the acrylic ester microspheres are mixed with the epoxy resin, improving the dispersion uniformity of the microsphere-resin interface, and inhibiting the sedimentation speed of the microspheres in the resin solution.

[0015] In some embodiments, in S1, the catalyst is selected from one of dibutyltin dilaurate, benzyldimethylamine, and bismuth carboxylate; the amount of the catalyst is 0.1-0.3% of the total mass of the bisphenol A type epoxy resin and the polyetheramine D230.

[0016] In some embodiments, the mass ratio of the silane coupling agent to the solvent is 1:8-15; the silane coupling agent is selected from one of γ-aminopropyl triethoxysilane, γ-glycidyl ether propyl trimethoxysilane, and N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane; the solvent is selected from at least one of anhydrous ethanol, methanol, and isopropyl alcohol; the mixed solvent is mixed by butyl acetate and propylene glycol methyl ether at a mass ratio of 2-3:0.8-1, and the amount of the mixed solvent is 13-15% of the mass of the modified epoxy resin; the dispersant is selected from at least one of a nano-silicon dioxide dispersant, a nano-aluminum oxide dispersant, and a polyurethane super dispersant.

[0017] The third aspect of the present application is to provide an application of the high dust holding capacity filter paper in air filtration of gas turbines, oxygen production stations, air compressors and vehicle intake systems.

[0018] Compared with the prior art, the present application has the following beneficial effects: 1. The high dust holding capacity filter paper provided by the present invention has a water-resistant agent but no resin impregnation portion accounting for 20-50% of the entire paper-making portion, which can effectively improve the dust holding capacity and moisture resistance of the filter paper; at the same time, the resin impregnation portion accounts for 50-80% of the entire paper-making portion, providing physical properties for the filter paper; therefore, the dust holding capacity filter paper has the characteristics of high dust holding capacity while possessing excellent physical properties.

[0019] 2. This invention utilizes the curing of bisphenol A epoxy resin and polyetheramine D230 to form a three-dimensional cross-linked network, endowing the material with high modulus and rigidity. Acrylic microspheres provide a certain degree of elasticity and porous structure, overcoming the limitations of traditional filter materials that are brittle and prone to collapse. The reaction of polyetheramine D230 with bisphenol A epoxy resin generates β-hydroxyamine. During impregnation, the β-hydroxyamine groups preferentially adsorb onto the fiber surface of the high dust holding capacity filter paper through molecular hydrogen bonding, including but not limited to molecular hydrogen bonding. This prevents the resin from clogging the fiber gaps due to diffusion solely relying on physical concentration, thereby avoiding the situation where the resin forms rigid filling in the gaps, leading to a decrease in the material's elongation at break and burst strength, as well as the situation where the resin clogs the fiber gaps, resulting in a reduction in the effective dust holding area.

[0020] 3. This invention improves the dispersibility of acrylate microspheres in resin solutions by silanizing them. The acrylate microspheres form a three-level pore structure with the resin shrinkage pores and fiber gaps, achieving high dust holding capacity and low pressure drop performance, while taking into account environmental protection, compatibility and cost controllability, providing a new generation solution for the filter material industry. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the air filtration process using filter paper. Figure 2 A schematic diagram of the structure of high dust holding capacity filter paper; Figure 3 This is a schematic diagram of the resin impregnation device. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments.

[0023] A schematic diagram of the air filtration process using filter paper is shown below. Figure 1 As shown, in Figure 1 In the diagram, 1 represents the inflow air, 2 represents the inflow surface of the filter paper, 3 represents the cross-section of the filter paper, 4 represents the outflow surface of the filter paper, and 5 represents the outflow air. Due to the twisted and varied pore channels of the filter paper, pollutants are often trapped near the openings of the pores, i.e., near the inflow surface 2, rather than being trapped deep within the filter paper. Pollutants are mainly concentrated on the inflow surface 2, while the outflow surface 4 contains relatively few pollutants.

[0024] like Figure 2As shown, the thickness of the resin impregnation is 50-80% of the thickness of the high dust capacity filter paper, and the rest of the thickness of the high dust capacity filter paper is 20-50% with water repellent agent but without resin impregnation. For example, the thickness of the high dust capacity filter paper is 1.0 mm, from the outflow surface 12 of the high dust capacity filter paper upward, 50-80% (i.e. 0.5 mm-0.8 mm) of the thickness of the high dust capacity filter paper is resin-bonded, which provides the filter paper with physical properties such as burst resistance, stiffness, etc.; from the inflow surface 11 of the high dust capacity filter paper downward, the rest of 20-50% (i.e. 0.2 mm-0.5 mm) of the thickness of the high dust capacity filter paper is with water repellent agent but without resin impregnation, i.e. the base paper, which has a loose structure and can provide the filter paper with dust capacity and moisture resistance; therefore, the high dust capacity filter paper of the present specification has excellent physical properties and at the same time has the characteristics of high dust capacity and moisture resistance.

[0025] The resin impregnation device is used to impregnate the base paper of the filter paper with resin, as shown in Figure 3 The resin impregnation device includes an anilox roller 9, a smooth roller 7, a doctor blade 10 and a glue tank 8, the glue tank 8 is provided with a resin solution, the lower part of the anilox roller 9 extends into the resin solution, the smooth roller 7 is arranged in pairs with the anilox roller 9, and the smooth roller 7 is arranged away from the glue tank 8, the base paper (such as paper web) of the filter paper passes between the gap between the smooth roller 7 and the anilox roller 9, the anilox roller 9 is provided with the doctor blade 10 on one side, and this side is the side from which the anilox roller 9 rotates out of the resin solution, and the cutting edge of the doctor blade 10 is in contact with the anilox roller 9.

[0026] Example 1 In this embodiment, the preparation method of the high dust capacity filter paper includes the following steps: 1) Mix wood fibers with water in a pulp chest to obtain pulp, and after defibration and dispersion, transfer to the pulp chest, add 1.5% of absolute dry cationic water repellent agent to the pulp at the inflow surface, dilute to a wire concentration of 0.3% by using a pulp pump, and form a wet paper web by dehydrating and forming through a double-layer headbox; 2) Perform a pre-drying treatment on the obtained wet paper web at 100°C to obtain a base paper substrate with a certain strength, with a water-repellent inflow surface and a water-repellent outflow surface, to ensure smooth resin impregnation; 3) Impregnate the obtained dried paper web with resin using a resin impregnation device; as shown in Figure 3As shown, the resin impregnation device includes an anilox roller 9, a smooth roller 7, a doctor blade 10, and a glue tank 8. The glue tank 8 contains a resin solution. The lower part of the anilox roller 9 extends into the resin solution. The smooth roller 7 is arranged opposite the anilox roller 9, and the smooth roller 7 is positioned away from the glue tank 8. The filter paper base paper (such as paper web) passes through the gap between the smooth roller 7 and the anilox roller 9. A doctor blade 10 is provided on one side of the anilox roller 9, and this side is the side from which the anilox roller 9 rotates out of the resin solution. The blade of the doctor blade 10 contacts the anilox roller 9. Optionally, the surface of the anilox roller 9 is evenly distributed with a number of mesh holes, which are used to carry the resin solution.

[0027] 4) The paper web after sizing in step 3) is post-dried at 60-160℃ to obtain the high dust holding capacity filter paper of this embodiment.

[0028] like Figure 2 As shown, the high dust holding capacity filter paper in this embodiment includes an inflow surface 11 and an outflow surface 12. Resin is impregnated along the direction from the outflow surface 12 to the inflow surface 11 of the high dust holding capacity filter paper. The resin impregnation thickness is 70% of the thickness of the high dust holding capacity filter paper, while the remaining 30% of the filter paper thickness contains a water-resistant agent but is not impregnated with resin. The resin solution is prepared by the following steps: S1: Add 50 parts of bisphenol A type epoxy resin (produced by Shanghai Xinhua Resin Factory E51), 25 parts of polyetheramine D230 and dibutyltin dilaurate, and heat at 85°C for 1-2 hours under inert gas protection to obtain modified epoxy resin; the amount of dibutyltin dilaurate is 0.2% of the total mass of bisphenol A type epoxy resin and polyetheramine D230.

[0029] S2: 15 portions of activated acrylate microspheres were mixed with γ-aminopropyltriethoxysilane and anhydrous ethanol at a mass ratio of 1:12, impregnated for 40 min, and then dried at 75 °C for 5 min to obtain silanized acrylate microspheres; wherein, the specific steps of the activation treatment were to put the acrylate microspheres into a plasma treatment machine with a frequency of 14 MHz and treat them for 4 min at an argon flow rate of 30 sccm and a power of 230 W.

[0030] S3: The modified epoxy resin and the mixed solvent are mixed at 450 rpm to form a base material; wherein, the mixed solvent is composed of butyl acetate and propylene glycol methyl ether in a mass ratio of 2:1; the amount of mixed solvent is 13% of the mass of the modified epoxy resin.

[0031] S4: Increase the rotation speed to 850 rpm, add silanized acrylate microspheres to the base material and mix, then increase the rotation speed to 1500 rpm and add nano silica dispersant.

[0032] S5: The S4 mixed system is cured at 75°C for 12 min to obtain a resin solution.

[0033] Example 2 The example is basically identical with Example 1, with the only difference being: 1. The fiber raw material used is different. In this example, wood pulp and polyester fiber are mixed in a ratio of 7:3.

[0034] 2. The resin solution is prepared by the following steps: S1: 55 parts of bisphenol A type epoxy resin (production source: Shanghai Xinhua Resin Factory E51), 30 parts of polyetheramine D230 and benzyl dimethylamine are added, and the reaction is carried out at 85°C under inert gas protection for 1-2h to obtain a modified epoxy resin; the amount of benzyl dimethylamine is 0.3% of the total mass of bisphenol A type epoxy resin and polyetheramine D230.

[0035] S2: 15 parts of activated acrylic ester microspheres are mixed with γ-glycidoxypropyltrimethoxysilane and methanol in a mass ratio of 1:15, impregnated for 45 min, and then dried at 80°C for 8 min to obtain silanized acrylic ester microspheres; wherein the activation treatment is as follows: the acrylic ester microspheres are put into a plasma treatment machine with a frequency of 15MHz, and treated under the conditions of argon flow of 30sccm and power of 200W for 5min.

[0036] S3: The modified epoxy resin and the mixed solvent are mixed at 450 rpm to form a base; wherein the mixed solvent is obtained by mixing butyl acetate and propylene glycol methyl ether in a mass ratio of 3:1, and the amount of mixed solvent is 15% of the mass of the modified epoxy resin.

[0037] S4: The speed is increased to 850 rpm, the silanized acrylic ester microspheres are added to the base for mixing, and then the speed is increased to 1500 rpm, and the nano-alumina dispersant is added.

[0038] S5: The S4 mixed system is cured at 80°C for 8 min to obtain a resin solution.

[0039] The preparation method of the high dust capacity filter paper of this example is consistent with Example 1.

[0040] Example 3 The example is basically identical with Example 1, with the only difference being: 1. The fiber raw material used is different. In this example, wood pulp and glass fiber are mixed in a ratio of 7:3.

[0041] 2. The resin solution is prepared by the following steps: S1: adding 53 parts of bisphenol A type epoxy resin (production source: Shanghai Xinhua Resin Factory E51), 20 parts of polyetheramine D230 and benzyl dimethylamine, heating and reacting at 85°C for 1-2h in inert gas, and obtaining modified epoxy resin by reaction; wherein, the amount of benzyl dimethylamine is 0.1% of the total mass of bisphenol A type epoxy resin and polyetheramine D230.

[0042] S2: mixing 12 parts of activated acrylic ester microspheres with N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and isopropyl alcohol in a mass ratio of 1:8, dipping for 30min, and drying at 70°C for 10min to obtain silanized acrylic ester microspheres; wherein, the specific steps of activation treatment are as follows: putting the acrylic ester microspheres into a plasma treatment machine with a frequency of 13MHz, treating for 5min under the conditions of argon flow of 20sccm and power of 210W.

[0043] S3: mixing the modified epoxy resin and the mixed solvent at 500 rpm to form a base; wherein, the mixed solvent is obtained by mixing butyl acetate and propylene glycol methyl ether in a mass ratio of 2:0.8; and the amount of mixed solvent is 14% of the mass of modified epoxy resin.

[0044] S4: increasing the rotation speed to 750 rpm, adding the silanized acrylic ester microspheres to the base for mixing, then increasing the rotation speed to 1600 rpm, and adding the polyurethane hyperdispersant.

[0045] S5: curing the S4 mixed system at 70°C for 15min to obtain a resin solution.

[0046] The preparation method of the high dust capacity filter paper of the present embodiment is consistent with that of Example 1.

[0047] Example 4 The preparation method of the high dust capacity filter paper of the present embodiment is basically consistent with that of Example 1, and the only difference is that: The process parameters in the preparation process are different, and the thickness of the resin impregnation is 80% of the thickness of the high dust capacity filter paper.

[0048] The resin solution is prepared by the following steps: S1: adding 53 parts of bisphenol A type epoxy resin (production source: Shanghai Xinhua Resin Factory E51), 20 parts of polyetheramine D230 and benzyl dimethylamine, heating and reacting at 85°C for 1-2h in inert gas, and obtaining modified epoxy resin by reaction; wherein, the amount of benzyl dimethylamine is 0.1% of the total mass of bisphenol A type epoxy resin and polyetheramine D230.

[0049] S2: 12 parts of the activated acrylate microspheres were mixed with N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and isopropyl alcohol at a mass ratio of 1:8, and then immersed for 45 min and dried at 80°C for 10 min to obtain silanized acrylate microspheres; wherein the activation treatment was performed by placing the acrylate microspheres in a plasma treatment machine at a frequency of 14 MHz, under an argon flow of 30 sccm and a power of 215 W for 5 min.

[0050] S3: The modified epoxy resin and the mixed solvent were mixed at 400 rpm to form a base; wherein the mixed solvent was obtained by mixing butyl acetate and propylene glycol methyl ether at a mass ratio of 2.5:0.9; and the amount of the mixed solvent was 14% of the mass of the modified epoxy resin.

[0051] S4: The speed was increased to 750 rpm, and the silanized acrylate microspheres were added to the base for mixing, and then the speed was increased to 1550 rpm, and the nano-silica dispersant was added.

[0052] S5: The S4 mixed system was cured at 70°C for 15 min to obtain a resin solution.

[0053] The preparation method of the high dust capacity filter paper of the present embodiment is consistent with that of Example 1.

[0054] Example 5 The preparation method of the high dust capacity filter paper of the present embodiment is consistent with that of Example 1. 1. The process parameters in the preparation process are different, and the thickness of the resin impregnation is 75% of the thickness of the high dust capacity filter paper.

[0055] 2. The resin solution was prepared by the following steps: S1: 50 parts of bisphenol A type epoxy resin (production source: Shanghai Xinhua Resin Factory E51), 20 parts of polyetheramine D230 and dibutyl tin dilaurate were added and reacted under inert gas at 85°C for 1-2 h to obtain a modified epoxy resin; wherein the amount of dibutyl tin dilaurate was 0.3% of the total mass of the bisphenol A type epoxy resin and the polyetheramine D230.

[0056] S2: 15 parts of the activated acrylate microspheres were mixed with γ-aminopropyltriethoxysilane and isopropyl alcohol at a mass ratio of 1:14, and then immersed for 40 min and dried at 80°C for 8 min to obtain silanized acrylate microspheres; wherein the activation treatment was performed by placing the acrylate microspheres in a plasma treatment machine at a frequency of 15 MHz, under an argon flow of 25 sccm and a power of 200 W for 5 min.

[0057] S3: mixing the modified epoxy resin and the mixed solvent at 450 rpm to form a base; wherein the mixed solvent is mixed by butyl acetate and propylene glycol methyl ether in a mass ratio of 2:0.9; the amount of the mixed solvent is 14% of the mass of the modified epoxy resin.

[0058] S4: increasing the rotation speed to 750 rpm, adding the silanized acrylic ester microspheres into the base for mixing, then increasing the rotation speed to 1550 rpm, and adding the nano-silica dispersant.

[0059] S5: curing the S4 mixed system at 75°C for 15 min to obtain a resin solution.

[0060] The preparation method of the high dust holding capacity filter paper of the embodiment is consistent with that of Example 1.

[0061] Comparative Example 1 The preparation method of the high dust holding capacity filter paper of the embodiment is consistent with that of Example 1.

[0062] Comparative Example 2 The preparation method of the high dust holding capacity filter paper of the embodiment is consistent with that of Example 1.

[0063] Comparative Example 3 The preparation method of the high dust holding capacity filter paper of the embodiment is consistent with that of Example 1.

[0064] In order to verify that the high dust holding capacity filter paper provided by the application has excellent performance, the high dust holding capacity filter paper prepared in Examples 1-5 and the filter paper in Comparative Examples 1-3 are compared in terms of dust holding capacity and paper physical properties, and a commercially available dust holding filter paper (production source: China National Materials Technology Corporation) in Comparative Example 4 is additionally added, and the comparison results are shown in Table 1.

[0065] The basis weight is measured according to GB / T 451.2-2002, the air permeability is measured according to GB / T 5453-1997, the burst strength is measured according to GB / T 454-2002, the dust holding capacity is measured according to ISO5011-2014, and the conditions are that the terminal pressure difference is 2000 pa, the ash concentration is 1000 mg / cm 2 , and the face flow rate is 11.1 cm / s.

[0066] Table 1 From Table 1, it can be seen that the high dust holding capacity filter paper provided by Examples 1-5 of the application is obviously superior to Comparative Examples 1-4 in terms of dust holding capacity, air permeability and burst strength; combined with the comparative examples, it can be seen that not adding acrylic ester microspheres, not silanizing the microspheres, and not adding cationic water repellent will cause the dust holding capacity and burst strength of the filter paper to decrease significantly.

[0067] The above merely describes some embodiments of the present application. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A high dirt capacity filter paper, characterized by, The high dust capacity filter paper comprises an inlet flow surface and an outlet flow surface, the fiber pulp of the inlet flow surface of the high dust capacity filter paper is modified by a cationic water repellent; resin is impregnated along the direction from the outlet flow surface of the high dust capacity filter paper to the inlet flow surface of the high dust capacity filter paper, the thickness of resin impregnation is 50-80% of the thickness of the high dust capacity filter paper, and the remaining 20-50% of the thickness of the high dust capacity filter paper is impregnated with the water repellent but not with the resin.

2. The high dirt capacity filter paper of claim 1, wherein, The high dust capacity filter paper has a basis weight ranging from 60 to 200 g / m 2 , a thickness ranging from 0.1 to 2 mm, and an air permeability ranging from 60 to 2000 mm / s; and the cationic water repellent is added in a proportion of 1 to 5% of the mass of the fiber slurry.

3. A method of producing a high-capacity filter paper according to any one of claims 1 to 2, characterized in that, The high dust capacity filter paper comprises: The resin impregnation device is used to impregnate the filter paper base paper with resin, and the paper web after resin impregnation is subjected to post-drying at 0-160 DEG C; wherein the resin impregnation device comprises a screen roller, a smooth roller, a scraper and a glue tank, the glue tank is provided with a resin solution, the lower part of the screen roller is immersed in the resin solution, the smooth roller is arranged opposite to the screen roller, and the smooth roller is arranged away from the glue tank, the filter paper base paper passes through the gap between the smooth roller and the screen roller, one side of the screen roller is provided with a scraper, and the side is the side of the screen roller rotating out of the resin solution, and the blade edge of the scraper is in contact with the screen roller.

4. The method of producing a high dirt capacity filter paper according to claim 3, characterized in that, The filter paper base paper is prepared by the following method: The plant fiber and / or non-plant fiber is mixed with water, dispersed by defibration, transferred to a pulp chest, diluted to a wire concentration, dehydrated and formed into a wet paper web through a double-layer headbox, and subjected to pre-drying to obtain a dried paper web; The cationic water repellent is added to the pulp chest of the inlet flow surface of the high dust capacity filter paper.

5. The method of producing a high dirt capacity filter paper according to claim 3, characterized by, The plant fiber is selected from at least one of wood fiber, stem fiber, seed hair fiber or bast fiber; And / or, the non-plant fiber comprises inorganic fiber or chemical fiber; And / or, the wire concentration is 0.01-0.5%; And / or, the pre-drying is drying at 0-160 DEG C.

6. The method of producing a high dirt capacity filter paper according to claim 3, characterized by, The resin solution is prepared by the following steps: S1: adding bisphenol A type epoxy resin, polyether amine D230 and catalyst, reacting at 85 DEG C for 1-2 h under inert gas protection, and obtaining modified epoxy resin by reaction; S2: putting the acrylate microspheres into a plasma processor with a frequency of 13-15 MHz, treating for 3-5 min under the conditions of an argon flow rate of 20-30 sccm and a power of 200-230 W, then mixing with silane coupling agent and solvent, and impregnating and drying to obtain silanized acrylate microspheres; S3: mixing the modified epoxy resin and the mixed solvent to form a base; S4: adding the silanized acrylate microspheres and the dispersant into the base in sequence and mixing; S5: heating the mixed system obtained in S4 at 70-80 DEG C for 8-15 min to solidify and form the resin solution.

7. The method of producing a high dirt capacity filter paper according to claim 6, characterized in that, The resin solution comprises the following components by mass: bisphenol A type epoxy resin 50-55 parts, polyether amine D230 20-30 parts, and acrylate microspheres 10-15 parts; the mass ratio of the acrylate microspheres to the silane coupling agent is 1.5-2:

1.

8. The method of producing a high dirt capacity filter paper according to claim 6, characterized by, The catalyst in the S1 is selected from one of dibutyl tin dilaurate, benzyl dimethyl amine, bismuth carboxylate; the catalyst is used in an amount of 0.1-0.3% of the total mass of bisphenol A type epoxy resin and polyetheramine D230.

9. The method of producing a high dirt capacity filter paper according to claim 6, characterized by, The mass ratio of the silane coupling agent to the solvent is 1:8-15; the silane coupling agent is selected from one of gamma-aminopropyl triethoxysilane, gamma-glycidyl ether oxygen propyl trimethoxysilane, N-(beta-aminoethyl)-gamma-aminopropyl trimethoxysilane; the solvent is selected from at least one of anhydrous ethanol, methanol, isopropyl alcohol; the mixed solvent is obtained by mixing butyl acetate and propylene glycol methyl ether in a mass ratio of 2-3:0.8-1, and the mixed solvent is used in an amount of 13-15% of the mass of the modified epoxy resin; the dispersant is selected from at least one of nano-silica dispersant, nano-alumina dispersant, polyurethane super dispersant.

10. Application of the high dust capacity filter paper according to any one of claims 1-2 to air filtration of gas turbine, oxygen production station, air compressor and vehicle air intake system.

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