An anti-pasting bag self-cleaning dust removal filter material and its preparation process

Abstract

The present invention discloses an anti-pasting bag self-cleaning dust removal filter material and its preparation process, which relates to the technical field of dust removal filter materials and includes the following process: mixing a fluoroalkenyl monomer, an alkenyl monomer, fibers, and an initiator in dimethyl sulfoxide to obtain a dispersion; coating the dispersion on the surface of a needle-punched felt and baking to obtain a dust removal filter material. By mixing a fluoroalkenyl monomer, an alkenyl monomer, and fibers to prepare a dispersion, coating it on the surface of a needle-punched felt, and baking and reacting, the present invention forms a dust removal filter material with a fluorine-containing coating deposited thereon, which significantly reduces the surface energy of the filter material, endows the filter material with good surface anti-condensation and dust stripping properties, effectively avoids bag pasting caused by factors such as flue gas humidity and dust moisture, realizes self-cleaning ability, and improves its service life. Moreover, the loading of high-strength fibers on the surface of the needle-punched felt helps to improve the mechanical strength and stability of the prepared filter material.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal filter materials, and specifically to an anti-pasting bag self-cleaning dust removal filter material and its preparation process. Background Technique

[0002] With the rapid development of industry and the rapid growth of population, due to the influence of factors such as human production and activities, the emission of particulate matter has brought huge pressure to the environment and resources, resulting in a significant decline in air quality. To alleviate the air pollution situation, people have produced and used various dust removal equipment. Among them, as a fiber filter, the dust removal filter material has a good filtering effect on fine particulate matter in industrial polluted gases and will not cause secondary pollution, and is widely used. However, under actual complex working conditions, the dust removal filter material often undergoes dew condensation and bag pasting due to factors such as too low temperature, too high humidity, contact with viscous / oily substances, etc., resulting in dust densely covering the surface of the filter material, causing blockage, increasing the operating resistance, and affecting the filtering efficiency; and it will cause serious loss of the mechanical strength of the filter material, greatly shortening its service life. For example, Patent CN201710638346.8 discloses a dust removal filter material finishing liquid, its preparation method and application, which uses a composite of polytetrafluoroethylene emulsion, silicone oil emulsion, organosilicon waterproofing agent, etc. to impregnate the filter material to achieve the performance of water and oil repellency, anti-static, and anti-dew condensation and bag pasting. However, the waterproof grade of the prepared product is low, and it cannot effectively prevent the agglomeration and adhesion of dust, and the bag pasting phenomenon still occurs. Therefore, we propose an anti-pasting bag self-cleaning dust removal filter material and its preparation process. Summary of the Invention

[0003] The purpose of the present invention is to provide an anti-pasting bag self-cleaning dust removal filter material and its preparation process to solve the problems raised in the above background technique.

[0004] To solve the above technical problems, the present invention provides the following technical solution: An anti-pasting bag self-cleaning dust removal filter material, comprising a needle punched felt and a fiber layer provided on the surface of the needle punched felt.

[0005] Further, the material of the needle punched felt is one or a mixture of polytetrafluoroethylene, polyphenylene sulfide, para-aramid, meta-aramid, arylsulfone fiber, polyimide, aromatic polyamide, etc.

[0006] Further, the fiber layer is formed by coating and baking a dispersion liquid containing 0.15 - 6.0 g / L of fiber, 0 - 100 g / L of alkenyl monomer, and 30 - 70 g / L of fluorine-containing organic matter on the surface of the needle punched felt.

[0007] Further, the fiber is one or a mixture of aramid fiber, glass fiber, cellulose fiber, basalt fiber, etc.

[0008] A preparation process of an anti-pasting bag self-cleaning dust removal filter material, comprising the following processes:

[0009] Mix a fluorovinyl monomer, an allyl monomer, a fiber, and an initiator in dimethyl sulfoxide to obtain a dispersion;

[0010] Coat the dispersion on the surface of the needle-punched felt and bake to obtain the dust removal filter material.

[0011] Further, the process conditions of the baking are: keep warm at a temperature of 65-85 °C for 5-10 min, and dry at a temperature of 165-200 °C for 6-12 min.

[0012] Further, the dispersion comprises the following mass components: 30-70 g / L of fluorovinyl monomer, 0-100 g / L of allyl monomer, 0.15-6.0 g / L of fiber, and 0.1-1.0 g / L of initiator;

[0013] The initiator is 2,2-azobisisobutyronitrile.

[0014] Further, the fiber is one or a mixture of aramid fiber, glass fiber, cellulose fiber, and basalt fiber.

[0015] Further, the allyl monomer is one or a mixture of methyl methacrylate, butyl acrylate, acrylic acid, and ethylene glycol dimethacrylate.

[0016] Further, the fluorinated vinyl monomer is one or a mixture of vinyl tris(2,2,2-trifluoroethoxy)silane, 2-(perfluorobutyl)ethyl methacrylate, (perfluorocyclohexyl)methyl methacrylate, 2-(perfluorohexyl)ethyl methacrylate, dodecafluorooctyl methacrylate, 2-(perfluorooctyl)ethyl methacrylate, 2-(perfluoro-9-methyldecyl)ethyl methacrylate, and a branched fluorinated vinyl compound.

[0017] In the above technical solution, an alkenyl fluorine-containing monomer, an allyl monomer, and fibers are mixed in a solvent to prepare a dispersion, which is coated on the surface of a needle-punched felt and then baked. Under the action of an initiator and high temperature, the alkenyl fluorine-containing monomer undergoes free radical copolymerization to form a fluorine-containing polymer, which is loaded on the surfaces of the fibers and the needle-punched felt to form a dust removal filter material with a fluorine-containing coating deposited thereon. Affected by the high bond energy of C-F, the surface tension of the coating is reduced, and the chemical and biological inertness is improved, which significantly reduces the surface energy of the filter material, significantly improves its hydrophobic property, increases the repulsion force against oily substances, thereby endowing the filter material with good surface anti-condensation and dust stripping properties, effectively avoiding bag sticking caused by the action of flue gas humidity, dust moisture, etc., realizing self-cleaning ability, and increasing its service life. Moreover, the loading of high-strength fibers such as glass fiber, basalt fiber, and aramid fiber on the surface of the needle-punched felt helps to improve the mechanical strength and stability of the prepared filter material.

[0018] Further, the branched alkenyl fluorine-containing compound is prepared by the following process:

[0019] Potassium hydroxide, ethanol, and cardanol are mixed in N,N-dimethylformamide, and chloromethyl-terminated dimethyl polysiloxane and tetrabutylammonium bromide are added. Under the protection of a nitrogen atmosphere, the temperature is raised to 60-80 °C, and the reflux reaction is carried out for 16-20 h; after cooling, filtration, washing, and vacuum distillation, cardanol-based silicone oil is obtained;

[0020] Cardanol-based silicone oil, mercaptoethanol, and a photoinitiator are mixed in ethyl acetate, and ultraviolet irradiation is carried out for 6-10 h; liquid separation, washing, drying with anhydrous sodium sulfate, suction filtration, and rotary evaporation are carried out to obtain alkenyl alcohol;

[0021] The alkenyl alcohol is dissolved in pyridine, and p-toluenesulfonyl chloride is slowly added at a temperature of 0-3 °C, and the temperature is raised to 20-30 °C, and the reaction is carried out for 6-7 h; it is diluted with dichlorohexane, washed and extracted with saturated sodium bicarbonate aqueous solution, saturated ammonium chloride, and saturated sodium chloride aqueous solution, dried with anhydrous sodium sulfate, and vacuum dried to obtain alkenyl sulfonate;

[0022] Sodium perfluoroalkyl alcoholate is dissolved in N,N-dimethylformamide, and alkenyl sulfonate is slowly added at a temperature of 35-45 °C, and the heat preservation reaction is carried out for 150-200 min; after cooling, precipitation with methanol is carried out to obtain an alkenyl fluorine-containing compound.

[0023] Further, the cardanol-based silicone oil is prepared from the following components: calculated by mass, 10 parts of chloromethyl-terminated dimethyl polysiloxane, 20-22 parts of cardanol, 1.5-2.0 parts of tetrabutylammonium bromide, and 3.0-4.5 parts of potassium hydroxide;

[0024] The ratio of cardanol, ethanol, and N,N-dimethylformamide is 15 g / 20 mL / 100 mL.

[0025] Furthermore, the mass ratio of cardanol-based silicone oil, mercaptoethanol, and photoinitiator is 10:(0.9 - 4.6):(0.22 - 0.30);

[0026] The ratio of cardanol-based silicone oil to ethyl acetate is 30 g / 100 mL.

[0027] Furthermore, the ultraviolet wavelength is 360 nm.

[0028] Furthermore, the mass ratio of alkenyl alcohol to p-toluenesulfonyl chloride is 10:(1.2 - 2.6);

[0029] The ratio of alkenyl polyol to pyridine is 2 g / 100 mL.

[0030] Furthermore, the perfluoroalkyl alcohol sodium is C6-14 perfluoroalkyl ethanol sodium;

[0031] The mass ratio of perfluoroalkyl alcohol sodium to alkenyl sulfonate is 10:(3 - 6);

[0032] The ratio of perfluoroalkyl alcohol sodium to N,N-dimethylformamide is 8 g / 100 mL.

[0033] Furthermore, the perfluoroalkyl alcohol sodium is prepared by the following process:

[0034] Mix sodium hydride and tetrahydrofuran, and slowly add perfluoroalkyl alcohol at a temperature of 0 - 3 °C, then raise the temperature to 20 - 30 °C and react for 25 - 30 min; centrifuge to obtain perfluoroalkyl alcohol sodium.

[0035] Furthermore, the mass ratio of perfluoroalkyl alcohol to sodium hydride is 10:(0.5 - 0.9);

[0036] The ratio of perfluoroalkyl alcohol to tetrahydrofuran is (15 - 18) g / 100 mL.

[0037] In the above technical solution, the alkenyl fluorinated compound is obtained by reacting alkenyl alcohol sulfonic acid ester with perfluoroalkyl alcohol sodium. The alkenyl alcohol is obtained by carrying out Williamson synthesis reaction between cardanol and chloromethyl-terminated dimethyl polysiloxane, and adding the product with mercaptoethanol. By controlling the molar ratio between the double bond in cardanol and mercaptoethanol, unsaturated double bonds are retained in the reaction product to achieve subsequent copolymerization with acrylate monomers; after its product is grafted with perfluoroalkyl, the ability of the fluorinated chain segment to migrate to the coating surface is improved, which can effectively improve the hydrophobic and oleophobic properties of the prepared coating and further improve the surface anti-condensation and self-cleaning abilities of the filter material.

[0038] Meanwhile, a siloxane segment and a cardanol structure are introduced into the polyacrylate, endowing the surface treatment layer with good flexibility and hydrophobic properties, significantly enhancing the thermal stability and waterproof ability of the surface treatment layer; and improving the leveling property and adhesion of the treatment liquid, promoting the smoothness and uniformity of the treatment layer, and contributing to the further improvement of the dual-hydrophobicity, stability, durability of the surface treatment layer and its bonding performance with the fiber layer.

[0039] Furthermore, the obtained alkenyl alcohol structure is branched to increase the number of hydroxyl groups, and more perfluoroalkyl structures can be introduced. The specific process is as follows:

[0040] Under the protection of a nitrogen atmosphere, potassium methoxide and alkenyl alcohol are mixed and stirred for 25 - 30 min, then methanol is removed by heating; the temperature is raised to 87 - 95 °C, and glycidol is slowly added within 30 min, and the mixture is kept at a constant temperature for reaction for 2 - 5 h; it is cooled, washed, and dried to obtain alkenyl polyol.

[0041] Furthermore, the mass ratio of alkenyl alcohol, potassium methoxide, and glycidol is 10:(1.8 - 3.0):(5.9 - 7.4).

[0042] In the above technical solution, the obtained alkenyl alcohol is structurally branched to increase the number of its hydroxyl groups, so that the prepared alkenyl fluorinated compound contains more perfluoroalkyl structures; at the same time, its branched structure will improve the ability of the fluorinated chain segment to migrate to the surface of the surface treatment layer, making it easier to migrate to the surface of the film layer to form a high-fluorine surface layer, which can significantly improve the hydrophobic property of the surface layer, increase its repulsion to oily substances, effectively improve the dual-hydrophobic property of the obtained filter material, enhance its anti-condensation and self-cleaning abilities, and extend its service life.

[0043] Furthermore, the fiber is a POSS-modified fiber, which is specifically prepared by the following process:

[0044] Basalt fiber, octavinyl POSS, alkenyl fluorinated monomer, multi-mercapto compound, and photoinitiator are mixed in ethyl acetate and irradiated with ultraviolet light for 20 - 30 min; centrifuged, washed, and dried to obtain POSS-modified fiber.

[0045] Furthermore, the multi-mercapto compound is one or a mixture of two of tris(3-mercaptopropionic acid) trimethylolpropane ester and pentaerythritol tetra(3-mercaptopropionate).

[0046] Furthermore, the mass ratio of basalt fiber, octavinyl POSS, alkenyl fluorinated monomer, multi-mercapto compound, and photoinitiator is 10:(0.3 - 0.6):(3.3 - 5.6):(1.2 - 1.8):(0.5 - 0.8);

[0047] The ratio of basalt fiber to ethyl acetate is 10 g / 100 mL.

[0048] Further, the ultraviolet wavelength is 360 nm.

[0049] Further, the coating amount of the dispersion liquid on the surface of the needle-punched felt is 250-350 mL / m 2 .

[0050] In the above technical solution, a multi-mercapto compound is used as a cross-linking agent. Under the action of a photoinitiator, octavinyl POSS and an alkenyl fluorine-containing monomer are cross-linked and polymerized, and are loaded on the surface of basalt fibers, increasing the surface roughness of the fibers, thereby increasing the water contact angle of the coating; and restricting the movement of the cage-like rigid structure POSS, improving the strength of the coating. The low surface energy fluorine-containing chains on the fiber surface migrate to the coating surface, improving the double-hydrophobicity of the coating. By controlling the dosage of the reactants, double bonds still exist on the surface of the POSS-modified fibers for surface functionalization. After subsequent coating and baking of the dispersion liquid, they participate in double bond copolymerization. The modified basalt fibers (POSS-modified fibers) form an interpenetrating three-dimensional network with the copolymer of the fluorine-containing monomer and the allyl monomer, enhancing the bonding strength between the coating and the needle-punched felt and between the fiber and the fluorine-containing polymer, and improving the mechanical strength of the filter material. Specific embodiments

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0052] In the following specific embodiments,

[0053] Needle-punched felt: aramid needle-punched felt, with a gram weight of 560 g / m 2 , sourced from Jiangsu Aokai Environmental Technology Co., Ltd.;

[0054] The coating amount of the dispersion liquid on the surface of the needle-punched felt is 250 mL / m 2 :

[0055] Basalt fibers: with a diameter of 1-3 μm, sourced from Liaoning Jinshi Technology Group Co., Ltd.;

[0056] Polytetrafluoroethylene emulsion: Teflon DISP 30, with a solid content of 60 wt%, sourced from DuPont;

[0057] Octavinyl POSS: sourced from Forsman Technology (Beijing) Co., Ltd.;

[0058] Chloromethyl-terminated dimethyl polysiloxane: sourced from Jinjinle Chemical Co., Ltd.;

[0059] The photoinitiator is photoinitiator 1173;

[0060] Sodium perfluoroalkyl alcohol is prepared by the following process: Mix sodium hydride and tetrahydrofuran, and slowly add 2-perfluorooctylethanol at 0 °C. Then raise the temperature to 25 °C and react for 30 min; obtain by centrifugation; the mass ratio of 2-perfluorooctylethanol to sodium hydride is 10:0.7; the ratio of 2-perfluorooctylethanol to tetrahydrofuran is 16 g / 100 mL.

[0061] Example 1: A preparation process of an anti-pasting bag self-cleaning dust removal filter material includes the following processes:

[0062] Step 1: Preparation of fluorinated alkenyl monomer:

[0063] 1.1. Mix 3.0 parts of potassium hydroxide, ethanol, and 20 parts of cardanol in N,N-dimethylformamide, add 10 parts of chloromethyl-terminated dimethyl polysiloxane and 1.5 parts of tetrabutylammonium bromide, and under the protection of a nitrogen atmosphere, raise the temperature to 60 °C and reflux for 20 h; cool, filter, wash, and distill under reduced pressure to obtain cardanol-based silicone oil; the ratio of cardanol, ethanol, and N,N-dimethylformamide is 15 g / 20 mL / 100 mL;

[0064] Mix 10 parts of cardanol-based silicone oil, 0.9 part of mercaptoethanol, and 0.22 part of photoinitiator in ethyl acetate, and irradiate with ultraviolet light at 360 nm for 6 h; separate the liquid, wash, dry with anhydrous sodium sulfate, filter by suction, and rotary evaporate to obtain alkenyl alcohol; the ratio of cardanol-based silicone oil to ethyl acetate is 30 g / 100 mL;

[0065] 1.2. Under the protection of a nitrogen atmosphere, mix 1.8 parts of potassium methoxide and 10 parts of alkenyl alcohol, stir for 25 min, and then heat to remove methanol; raise the temperature to 87 °C, slowly add 5.9 parts of glycidol, add it within 30 min, and keep the temperature for reaction for 2 h; cool, wash, and dry to obtain alkenyl polyol;

[0066] 1.3. Dissolve 10 parts of alkenyl polyol in pyridine, and slowly add 2.0 parts of p-toluenesulfonyl chloride at 0 °C, then raise the temperature to 20 °C and react for 7 h; dilute with dichlorohexane, wash and extract with saturated sodium bicarbonate aqueous solution, saturated ammonium chloride, and saturated sodium chloride aqueous solution, dry with anhydrous sodium sulfate, and dry under vacuum to obtain alkenyl sulfonate; the ratio of alkenyl polyol to pyridine is 2 g / 100 mL;

[0067] Dissolve 10 parts of sodium perfluoroalkyl alcohol in N,N-dimethylformamide, and slowly add 4.5 parts of alkenyl sulfonate at 35 °C, and keep the temperature for reaction for 200 min; cool, precipitate with methanol, and obtain fluorinated alkenyl monomer; the ratio of sodium perfluoroalkyl alcohol to N,N-dimethylformamide is 8 g / 100 mL;

[0068] Step 2: Preparation of POSS-modified fiber:

[0069] Mix basalt fiber, octavinyl POSS, fluoro-containing vinyl monomer, polyfunctional mercapto compound, and photoinitiator in ethyl acetate, and irradiate with 360 nm ultraviolet light for 20 min; centrifuge, wash, and dry to obtain POSS-modified fiber; the polyfunctional mercapto compound is tris(3-mercaptopropionate) trimethylolpropane ester; the mass ratio of basalt fiber, octavinyl POSS, fluoro-containing vinyl monomer, polyfunctional mercapto compound, and photoinitiator is 10:0.3:3.3:1.2:0.5; the ratio of basalt fiber to ethyl acetate is 10 g / 100 mL;

[0070] Step 3: Mix fluoro-containing vinyl monomer, butyl acrylate, methyl methacrylate, POSS-modified fiber, and initiator in dimethyl sulfoxide to obtain a dispersion; the dispersion includes the following mass components: 10 g / L fluoro-containing vinyl monomer, 60 g / L methyl methacrylate, 40 g / L butyl acrylate, 1 g / L POSS-modified fiber, 0.1 g / L initiator 2,2'-azobisisobutyronitrile;

[0071] Coat the dispersion on the surface of the needle-punched felt, keep it at 65 °C for 10 min, and bake it at 165 °C for 12 min to obtain a dust removal filter material.

[0072] Example 2: A preparation process of an anti-pasting bag self-cleaning dust removal filter material, including the following processes:

[0073] Step 1: Preparation of fluoro-containing vinyl monomer:

[0074] 1.1. Mix 3.8 parts of potassium hydroxide, ethanol, and 21 parts of cardanol in N,N-dimethylformamide, add 10 parts of chloromethyl-terminated dimethyl polysiloxane and 1.8 parts of tetrabutylammonium bromide, and under the protection of a nitrogen atmosphere, heat to 70 °C and reflux for 18 h; cool, filter, wash, and distill under reduced pressure to obtain cardanol-based silicone oil; the ratio of cardanol, ethanol, and N,N-dimethylformamide is 15 g / 20 mL / 100 mL;

[0075] Mix 10 parts of cardanol-based silicone oil, 2.8 parts of mercaptoethanol, and 0.26 part of photoinitiator in ethyl acetate, and irradiate with 360 nm ultraviolet light for 8 h; separate the liquid, wash, dry with anhydrous sodium sulfate, filter by suction, and rotary evaporate to obtain alkenyl alcohol; the ratio of cardanol-based silicone oil to ethyl acetate is 30 g / 100 mL;

[0076] 1.2. Under the protection of a nitrogen atmosphere, mix 2.4 parts of potassium methoxide and 10 parts of alkenyl alcohol, stir for 27 min, and then heat to remove methanol; heat to 90 °C, slowly add 6.7 parts of glycidyl, add it within 30 min, and keep the temperature for reaction for 3.5 h; cool, wash, and dry to obtain alkenyl polyol;

[0077] 1.3. Dissolve 10 parts of alkenyl polyol in pyridine. Slowly add 2.3 parts of p-toluenesulfonyl chloride at 1 °C, then raise the temperature to 25 °C and react for 6.5 h. Dilute with dichlorohexane, wash and extract with saturated aqueous sodium bicarbonate solution, saturated ammonium chloride solution, and saturated aqueous sodium chloride solution, dry with anhydrous sodium sulfate, and dry in vacuo to obtain alkenyl sulfonate. The ratio of alkenyl polyol to pyridine is 2 g / 100 mL;

[0078] Dissolve 10 parts of perfluoroalkyl sodium alcoholate in N,N-dimethylformamide. Slowly add 5.3 parts of alkenyl sulfonate at 40 °C and keep the temperature for reaction for 180 min. Cool and precipitate with methanol to obtain fluorinated alkenyl monomer. The ratio of perfluoroalkyl sodium alcoholate to N,N-dimethylformamide is 8 g / 100 mL;

[0079] Step 2. Preparation of POSS-modified fiber:

[0080] Mix basalt fiber, octavinyl POSS, fluorinated alkenyl monomer, multi-mercapto compound, and photoinitiator in ethyl acetate, and irradiate with ultraviolet light at 360 nm for 25 min. Centrifuge, wash, and dry to obtain POSS-modified fiber. The multi-mercapto compound is pentaerythritol tetra(3-mercaptopropionate). The mass ratio of basalt fiber, octavinyl POSS, fluorinated alkenyl monomer, multi-mercapto compound, and photoinitiator is 10:0.4:4.4:1.5:9.6. The ratio of basalt fiber to ethyl acetate is 10 g / 100 mL;

[0081] Step 3. Mix fluorinated alkenyl monomer, butyl acrylate, methyl methacrylate, POSS-modified fiber, and initiator in dimethyl sulfoxide to obtain a dispersion. The dispersion includes the following mass components: 20 g / L fluorinated alkenyl monomer, 61 g / L methyl methacrylate, 39 g / L butyl acrylate, 1.5 g / L POSS-modified fiber, and 0.5 g / L initiator 2,2'-azobisisobutyronitrile;

[0082] Coat the dispersion on the surface of the needle-punched felt, keep it at 75 °C for 8 min, and bake at 180 °C for 9 min to obtain a dust removal filter material.

[0083] Example 3: A preparation process of an anti-pasting bag self-cleaning dust removal filter material, including the following processes:

[0084] Step 1. Preparation of fluorinated alkenyl monomer:

[0085] 1.1 Mix 4.5 parts of potassium hydroxide, ethanol, and 22 parts of cardanol in N,N-dimethylformamide. Add 10 parts of chloromethyl-terminated dimethyl polysiloxane and 2.0 parts of tetrabutylammonium bromide. Under the protection of a nitrogen atmosphere, heat the mixture to 80 °C and reflux for 16 h. Cool, filter, wash, and distill under reduced pressure to obtain cardanol-based silicone oil. The ratio of cardanol, ethanol, and N,N-dimethylformamide is 15 g / 20 mL / 100 mL;

[0086] Mix 10 parts of cardanol-based silicone oil, 4.6 parts of mercaptoethanol, and 0.30 part of photoinitiator in ethyl acetate. Irradiate with ultraviolet light at 360 nm for 10 h. Separate the liquid, wash, dry with anhydrous sodium sulfate, filter by suction, and rotary evaporate to obtain alkenyl alcohol. The ratio of cardanol-based silicone oil to ethyl acetate is 30 g / 100 mL;

[0087] 1.2 Under the protection of a nitrogen atmosphere, mix 3.0 parts of potassium methoxide and 10 parts of alkenyl alcohol. Stir for 30 min and then heat to remove methanol. Heat to 95 °C and slowly add 7.4 parts of glycidol within 30 min. Keep the temperature for reaction for 5 h. Cool, wash, and dry to obtain alkenyl polyol;

[0088] Dissolve 10 parts of alkenyl polyol in pyridine. Slowly add 2.6 parts of p-toluenesulfonyl chloride at 0 °C and then heat to 30 °C for reaction for 6 h. Dilute with dichlorohexane, wash and extract with saturated sodium bicarbonate aqueous solution, saturated ammonium chloride, and saturated sodium chloride aqueous solution, dry with anhydrous sodium sulfate, and dry under vacuum to obtain alkenyl sulfonate. The ratio of alkenyl polyol to pyridine is 2 g / 100 mL;

[0089] Dissolve 10 parts of perfluoroalkyl alcohol sodium in N,N-dimethylformamide. Slowly add 6 parts of alkenyl sulfonate at 45 °C and keep the temperature for reaction for 150 min. Cool and precipitate with methanol to obtain fluorinated alkenyl monomer. The ratio of perfluoroalkyl alcohol sodium to N,N-dimethylformamide is 8 g / 100 mL;

[0090] Step 2: Preparation of POSS-modified fiber:

[0091] Mix basalt fiber, octavinyl POSS, fluorinated alkenyl monomer, polythiol compound, and photoinitiator in ethyl acetate. Irradiate with ultraviolet light at 360 nm for 30 min. Centrifuge, wash, and dry to obtain POSS-modified fiber. The polythiol compound is pentaerythritol tetra(3-mercaptopropionate). The mass ratio of basalt fiber, octavinyl POSS, fluorinated alkenyl monomer, polythiol compound, and photoinitiator is 10:0.6:5.6:1.8:0.8. The ratio of basalt fiber to ethyl acetate is 10 g / 100 mL;

[0092] Step 3: Mix the fluoroalkenyl monomer, butyl acrylate, methyl methacrylate, POSS-modified fiber, and initiator in dimethyl sulfoxide to obtain a dispersion; the dispersion includes the following mass components: 30 g / L fluoroalkenyl monomer, 62 g / L methyl methacrylate, 38 / L butyl acrylate, 2.0 g / L POSS-modified fiber, 1.0 g / L initiator 2,2-azobisisobutyronitrile;

[0093] Coat the dispersion on the surface of the needle-punched felt, keep it at 85 °C for 5 min, and bake it at 200 °C for 6 min to obtain a dust removal filter material.

[0094] Comparative Example 1: A preparation process of an anti-pasting bag self-cleaning dust removal filter material, including the following process:

[0095] Step 1: Preparation of fluoroalkenyl monomer:

[0096] Under the protection of a nitrogen atmosphere, mix potassium methoxide and 5-hexene-1,2-diol; stir for 27 min, then heat to remove methanol; raise the temperature to 90 °C, slowly add glycidol, and add it within 30 min, keep the temperature for reaction for 120 min; cool, add water, sediment in acetone, and vacuum dry to obtain alkenyl polyol; the mass ratio of 5-hexene-1,2-diol, potassium methoxide, and glycidol is 1:24.2:107;

[0097] Dissolve the alkenyl polyol in pyridine, slowly add p-toluenesulfonyl chloride at 1 °C, raise the temperature to 25 °C, and react for 6.5 h; dilute with dichlorohexane, wash and extract with saturated sodium bicarbonate aqueous solution, saturated ammonium chloride, and saturated sodium chloride aqueous solution, and dry with anhydrous sodium sulfate and vacuum dry to obtain alkenyl sulfonate; the mass ratio of alkenyl polyol to p-toluenesulfonyl chloride is 10:3.0; the ratio of alkenyl polyol to pyridine is 2 g / 100 mL;

[0098] Dissolve sodium perfluoroalkyl alcohol in N,N-dimethylformamide, slowly add alkenyl sulfonate at 40 °C, keep the temperature for reaction for 180 min; cool, precipitate with methanol to obtain alkenyl fluorinated compound; sodium perfluoroalkyl alcohol is sodium 2-perfluorooctylethanol; the mass ratio of sodium perfluoroalkyl alcohol to alkenyl sulfonate is 10:4; the ratio of sodium perfluoroalkyl alcohol to N,N-dimethylformamide is 8 g / 100 mL;

[0099] The dispersion includes the following mass components: 10 g / L fluoroalkenyl monomer, 60 g / L methyl methacrylate, 40 g / L butyl acrylate, 1 g / L basalt fiber, 0.1 g / L initiator 2,2-azobisisobutyronitrile; other processes are the same as in Example 1 to obtain a dust removal filter material.

[0100] Comparative Example 2: A preparation process of an anti-pasting bag self-cleaning dust removal filter material, including the following process:

[0101] Step 1 is the same as that in Comparative Example 2;

[0102] Step 2: Mix polytetrafluoroethylene emulsion and basalt fiber in water to form a dispersion; the dispersion includes the following mass components: 110 g / L of polytetrafluoroethylene and 1 g / L of basalt fiber;

[0103] Coat the dispersion on the surface of the needle-punched felt and bake it at 165 °C for 12 min to obtain a dust removal filter material.

[0104] Comparative Example 3: A preparation process of an anti-pasting bag self-cleaning dust removal filter material, including the following process:

[0105] Mix dodecafluoroheptyl methacrylate, vinyltrimethoxysilane, butyl acrylate, methyl methacrylate, and an initiator in dimethyl sulfoxide to obtain a dispersion; the dispersion includes the following mass components: 6 g / L of dodecafluoroheptyl methacrylate, 4 g / L of vinyltris(2,2,2-trifluoroethoxy)silane, 60 g / L of methyl methacrylate, 40 g / L of butyl acrylate, and 0.1 g / L of initiator 2,2-azobisisobutyronitrile;

[0106] Coat the dispersion on the surface of the needle-punched felt, keep it at 65 °C for 10 min, and bake it at 165 °C for 12 min to obtain a dust removal filter material.

[0107] Comparative Example 4: A preparation process of an anti-pasting bag self-cleaning dust removal filter material, including the following process:

[0108] Mix vinyltris(2,2,2-trifluoroethoxy)silane, butyl acrylate, methyl methacrylate, basalt fiber, and an initiator in dimethyl sulfoxide to obtain a dispersion; the dispersion includes the following mass components: 10 g / L of vinyltris(2,2,2-trifluoroethoxy)silane, 60 g / L of methyl methacrylate, 40 g / L of butyl acrylate, and 0.1 g / L of initiator 2,2-azobisisobutyronitrile;

[0109] Coat the dispersion on the surface of the needle-punched felt, keep it at 65 °C for 10 min, and bake it at 165 °C for 12 min to obtain a dust removal filter material.

[0110] Experiment: Take the dust removal filter materials obtained in Examples 1-3 and Comparative Examples 1-4, equilibrate them at 25 °C and 65% RH for 24 h to prepare specimens, and detect and record the test results of their properties respectively:

[0111] Mechanical property test: Use an electronic universal material testing machine to detect the mechanical properties of the specimens at a tensile speed of 100 mm / min;

[0112] Double-hydrophobic property test: Water repellency test: Referring to AATCC22-1977 as the reference standard, place the specimen at a 45° angle, pour 250 mL of water at a position 150 mm above the center of the specimen, and let it sprinkle on the surface of the specimen within 25 - 30 s. The size of the specimen is 18 cm × 18 cm. After sprinkling, place the specimen face down horizontally and tap it gently twice. Determine the water repellency grade based on the water wetting condition on the surface of the specimen.

[0113] Oil repellency test: Referring to AATCC118-1992 as the reference standard, drop 0.05 mL of No. 1 experimental liquid mineral oil on the surface of the specimen. If there is no penetration and wetting phenomenon within 30 s, drop a higher numbered experimental liquid on the specimen until the experimental liquid wets the specimen below the liquid drop within 30 s.

[0114] Self-cleaning property test: Place the specimen on a 15° inclined plane, and use pulverized coal with a humidity of 4.7% to conduct a 10 - minute continuous rolling test on the surface of the specimen. After the test, place the specimen face down horizontally and tap it gently twice to detect the retention area of the pulverized coal on the surface of the specimen.

[0115] Filtration performance test: Use a filter material test bench to detect the dust removal efficiency of the specimen.

[0116]

[0117] According to the data in the above table, the following conclusions can be clearly obtained:

[0118] The dust removal filter materials obtained in Examples 1 - 3 are compared with the dust removal filter materials obtained in Comparative Examples 1 - 4. From the test results,

[0119] Compared with the comparative examples, the dust removal filter materials obtained in Examples 1 - 3 have higher tensile strength, water repellency grade, oil repellency grade data and lower retention area, and at the same time have good dust removal performance. This fully demonstrates that this application has achieved the improvement of the mechanical properties, anti-condensation, and self-cleaning ability of the dust removal filter material.

[0120] Compared with Example 1, the preparation process of the fluorinated alkenyl monomer in Comparative Example 1 is different, and the fiber is not modified with POSS; in Comparative Example 2, the acrylic compound is not replaced with polytetrafluoroethylene; on the basis of Comparative Example 2, the fluorinated alkenyl monomer in Comparative Example 3 is dodecafluoroheptyl methacrylate and vinyltrimethoxysilane; the fluorinated alkenyl monomer in Comparative Example 4 is vinyltris(2,2,2-trifluoroethoxy)silane. For the dust removal filter materials obtained in Comparative Examples 1 - 4, their tensile strength, water repellency grade, and oil repellency grade data decrease, and the retention area data increases. It can be seen that the setting of the preparation process of the dust removal filter material and the components used in the present invention can promote the comprehensive improvement of its mechanical properties, anti-condensation, and self-cleaning ability while maintaining good filtration performance.

[0121] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in all respects, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Accordingly, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A preparation process for an anti-sticking bag self-cleaning dust removal filter material, characterized in that: Including the following processes: Mixing fluorinated olefin monomer, propylene monomer, fiber and initiator in dimethyl sulfoxide to obtain a dispersion; The dispersion is applied to the surface of the needle felt and baked to obtain a dust removal filter material; The fluorine-containing alkenyl monomer is a branched alkenyl fluorine-containing compound; The branched alkenyl fluorine-containing compound is prepared by the following process: Potassium hydroxide, ethanol and cardanol are mixed in N,N-dimethylformamide, chloromethyl-terminated dimethylpolysiloxane and tetrabutylammonium bromide are added, and the temperature is raised to 60-80° C. under the protection of nitrogen atmosphere, and refluxed for 16-20 hours to obtain cardanol-based silicone oil; Mixing cardanol-based silicone oil, mercaptoethanol and a photoinitiator in ethyl acetate and irradiating with ultraviolet light for 6 to 10 hours to obtain alkenyl alcohol; Under the protection of nitrogen atmosphere, potassium methoxide and alkenyl alcohol are mixed, stirred for 25 to 30 minutes, and then heated to remove methanol; the temperature is raised to 87 to 95°C, glycidol is slowly added within 30 minutes, and the temperature is kept for reaction for 2 to 5 hours to obtain alkenyl polyol; Dissolve the alkenyl polyol in pyridine, slowly add p-toluenesulfonyl chloride at 0-3°C, raise the temperature to 20-30°C, and react for 6-7h to obtain alkenyl sulfonate; Dissolve sodium perfluoroalkyl alcohol in N,N-dimethylformamide, slowly add olefin sulfonate at 35-45°C, and keep the temperature to react for 150-200 minutes to obtain a branched olefin fluorine-containing compound; The fiber is a POSS modified fiber, which is specifically prepared by the following process: The basalt fiber, octavinyl POSS, fluorine-containing olefin monomer, polythiol compound and photoinitiator are mixed in ethyl acetate and irradiated with ultraviolet light for 20 to 30 minutes to obtain POSS modified fiber.

2. The preparation process of the anti-sticking bag self-cleaning dust removal filter material according to claim 1, characterized in that: The cardanol-based silicone oil is prepared from the following components: by mass, 10 parts of chloromethyl-terminated dimethyl polysiloxane, 20 to 22 parts of cardanol, 1.5 to 2.0 parts of tetrabutylammonium bromide, and 3.0 to 4.5 parts of potassium hydroxide.

3. The preparation process of the anti-sticking bag self-cleaning dust removal filter material according to claim 2 is characterized in that: The mass ratio of the cardanol-based silicone oil, mercaptoethanol and photoinitiator is 10:(0.9-1.3):(0.22-0.30).

4. The preparation process of the anti-sticking bag self-cleaning dust removal filter material according to claim 2 is characterized in that: The mass ratio of the alkenyl alcohol, potassium methoxide and glycidol is 10:(1.8-3.0):(5.9-7.4).

5. The preparation process of the anti-sticking bag self-cleaning dust removal filter material according to claim 1, characterized in that: The polythiol compound is one of tris(3-mercaptopropionic acid) trimethylolpropane ester and pentaerythritol tetrakis(3-mercaptopropionic acid) ester or a mixture of the two.

6. The preparation process of the anti-sticking bag self-cleaning dust removal filter material according to claim 1, characterized in that: The mass ratio of basalt fiber, octavinyl POSS, fluorine-containing olefin monomer, polythiol compound and photoinitiator is 10: (0.3-0.6): (3.3-5.6): (1.2-1.8): (0.5-0.8).

7. An anti-bag-sticking self-cleaning dust removal filter material prepared according to the preparation process according to any one of claims 1 to 6.

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