CN108978351B - Air filter paper and preparation method thereof - Google Patents
Air filter paper and preparation method thereof Download PDFInfo
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- CN108978351B CN108978351B CN201810820156.2A CN201810820156A CN108978351B CN 108978351 B CN108978351 B CN 108978351B CN 201810820156 A CN201810820156 A CN 201810820156A CN 108978351 B CN108978351 B CN 108978351B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/08—Filter paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
- D21H15/12—Composite fibres partly organic, partly inorganic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/08—Dispersing agents for fibres
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Paper (AREA)
Abstract
The invention provides air filter paper, which comprises the following components: 100 parts by weight of main body glass fiber; 10-20 parts of molecular sieve activation powder; 0.3 to 0.6 parts by weight of a dispersant; 5-15 parts of wood pulp fiber; 5-15 parts of a binding agent; the main glass fiber is prepared from (1-4) by mass: 1 chopped continuous glass fiber and glass fiber cotton. Compared with the prior art, the air filter paper provided by the invention adopts the components with specific dosage, the components have good interaction, the prepared air filter paper has good high temperature resistance, low wind resistance and high mechanical strength, can effectively block harmful particles, has high integral filtering efficiency, and can efficiently filter acid gases such as hydrogen sulfide, carbon dioxide and the like in air.
Description
Technical Field
The invention relates to the technical field of filter materials, in particular to air filter paper and a preparation method thereof.
Background
With the development of industry, harmful components in the air are increasing continuously, and various particles and harmful components floating in the air threaten the industries of optical electronics, LCD liquid crystal manufacturing, biomedicine, precise instruments, beverages, foods, PCB printing and the like. In order to solve the technical problem, scientific research personnel install the high-efficiency filter at the air supply position at the tail end of the air conditioner in the dustless workshop in the industry, so that the harm can be reduced to a certain extent. The filter paper is used as an important component of the high-efficiency filter and has the excellent performances of low wind resistance, large dust holding capacity and high filtering efficiency.
At present, the pre-filtering filter paper produced in China generally takes chemical fibers as main materials, but the chemical fibers have very poor flame retardant property, so that the filter paper prepared by taking the chemical fibers as raw materials cannot adapt to a high-temperature working environment; meanwhile, foreign similar glass fiber filter paper is molded by a dry method, the production cost is high, and the product structure is loose. Therefore, a high temperature resistant and low resistance primary filter paper and a preparation method thereof are urgently needed. In recent years, with the continuous and deep research on filter paper by scientific researchers, a plurality of products with better performance are developed. For example, chinese patent publication No. CN106400598A discloses a method for preparing enhanced water peanut air filter paper, which uses water peanuts to enhance the filtration performance of the filter paper; however, in the practical application process, the filtering efficiency is low, and most harmful components and impurities can still permeate through the filter paper.
To sum up, the air filter paper in the prior art still can not satisfy the requirement of people to high-quality air environment, is difficult to reach the purpose of high-efficient filtration.
Disclosure of Invention
In view of the above, the present invention provides an air filter paper and a preparation method thereof, and the air filter paper provided by the present invention has good high temperature resistance, low wind resistance and high mechanical strength, can effectively block harmful particles, has high overall filtration efficiency, and can efficiently filter acidic gases such as hydrogen sulfide and carbon dioxide in air.
The invention provides air filter paper, which comprises the following components:
100 parts by weight of main body glass fiber;
10-20 parts of molecular sieve activation powder;
0.3 to 0.6 parts by weight of a dispersant;
5-15 parts of wood pulp fiber;
5-15 parts of a binding agent;
the main glass fiber is prepared from (1-4) by mass: 1 chopped continuous glass fiber and glass fiber cotton.
Preferably, the chopped continuous glass fibers comprise one or more of high silica type chopped fibers, alkali-free chopped glass fibers, medium alkali chopped glass fibers and high alkali chopped glass fibers.
Preferably, the bonding agent is acrylic emulsion with the mass concentration of 1.5-10%.
Preferably, the wood pulp fibers include softwood fibers and hardwood fibers; the length of the softwood fiber is 2 mm-10 mm, and the length of the hardwood fiber is 0.5 mm-1.5 mm.
The invention also provides a preparation method of the air filter paper, which comprises the following steps:
a) mixing main glass fiber, molecular sieve activated powder and water, and pulping for the first time in the presence of a dispersant to obtain first slurry; simultaneously mixing wood pulp fibers with water, and pulping for the second time to obtain a second pulp; then mixing the first sizing agent and the second sizing agent with water to obtain fiber cotton pulp;
b) molding the fiber cotton pulp obtained in the step a) to obtain a wet paper blank;
c) and c) gluing the wet paper blank obtained in the step b) by using a binding agent, and drying to obtain the air filter paper.
Preferably, the fiber concentration of the first slurry in the step a) is 0.8% -2%; the fiber concentration of the second slurry is 3% -10%; the fiber concentration of the fiber cotton pulp is 0.05-0.4%.
Preferably, the beating degree of the second beating in the step a) is 55-65 DEG SR.
Preferably, the molding process in step b) specifically comprises:
conveying the fiber cotton pulp obtained in the step a) to a forming mesh belt to form a wet paper blank, and simultaneously absorbing and removing excessive moisture in the wet paper blank through a vacuum pump to obtain the wet paper blank with the thickness of 0.2-0.6 mm and the moisture content of 45-55%.
Preferably, the sizing process in step c) is specifically:
uniformly applying a bonding agent on the surface of the wet paper blank obtained in the step b) to enable the bonding agent to permeate into the paper blank, and simultaneously sucking and removing the redundant bonding agent through a vacuum pump, wherein the glue application amount is 0.5-3 times of the weight of the wet paper blank, so that the glued wet paper blank is obtained.
Preferably, the drying temperature in the step c) is 80-160 ℃, and the drying time is 15-40 min.
The invention provides air filter paper, which comprises the following components: 100 parts by weight of main body glass fiber; 10-20 parts of molecular sieve activation powder; 0.3 to 0.6 parts by weight of a dispersant; 5-15 parts of wood pulp fiber; 5-15 parts of a binding agent; the main glass fiber is prepared from (1-4) by mass: 1 chopped continuous glass fiber and glass fiber cotton. Compared with the prior art, the air filter paper provided by the invention adopts the components with specific dosage, the components have good interaction, the prepared air filter paper has good high temperature resistance, low wind resistance and high mechanical strength, can effectively block harmful particles, has high integral filtering efficiency, and can efficiently filter acid gases such as hydrogen sulfide, carbon dioxide and the like in air. The experimental result shows that the air filter paper provided by the invention can resist the high temperature of more than 800 ℃, the wind resistance is 270N-310N, the strength is 0.6 MPa-1.0 MPa, and the stiffness is 1200 mg-1400 mg; the product can absorb hydrogen sulfide, carbon dioxide and other acidic gases in the air, and the filtering efficiency is 99.965-99.985%.
In addition, the preparation method provided by the invention has the advantages of simple process and low cost, and is suitable for large-scale industrial production.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides air filter paper, which comprises the following components:
100 parts by weight of main body glass fiber;
10-20 parts of molecular sieve activation powder;
0.3 to 0.6 parts by weight of a dispersant;
5-15 parts of wood pulp fiber;
5-15 parts of a binding agent;
the main glass fiber is prepared from (1-4) by mass: 1 chopped continuous glass fiber and glass fiber cotton.
In the invention, the main glass fiber is prepared from the following components in percentage by mass (1-4): 1 chopped continuous glass fiber and glass fiber cotton. In a preferred embodiment of the present invention, the main glass fiber is formed by mixing, by mass, 4: 1, short-cut continuous glass fiber and glass fiber cotton; in another preferred embodiment of the present invention, the main glass fiber is formed by mixing, by mass, 1: 1 chopped continuous glass fiber and glass fiber cotton. The source of the chopped continuous glass fibers and glass fiber wool is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. The invention takes the chopped continuous glass fiber and the glass fiber cotton as main base materials, and can ensure that the product has the basic performance of the air filter paper.
In the present invention, the chopped continuous glass fibers preferably include one or more of high silica type chopped fibers, alkali-free chopped glass fibers, medium alkali chopped glass fibers and high alkali chopped glass fibers. In a preferred embodiment of the present invention, the chopped continuous glass fibers are high silica type chopped fibers; in another preferred embodiment of the present invention, the chopped continuous glass fibers are mixed in a mass ratio of 3: 5 of alkali-free chopped glass fibers and medium-alkali chopped glass fibers; in another preferred embodiment of the present invention, the chopped continuous glass fibers are mixed in a mass ratio of 1: 4 high alkali chopped glass fibers and high silica type chopped glass fibers. In the present invention, the chopped continuous glass fibers preferably have a fiber length of 6mm to 30mm, more preferably 10mm to 20 mm.
In the present invention, the air filter paper includes 100 parts by weight of the body glass fiber.
In the invention, the particle size of the molecular sieve activation powder is preferably 1-5 μm, and more preferably 2-4 μm; the bulk density is preferably not less than 0.2g/mL, more preferably not less than 0.4 g/mL; the static water adsorption is preferably 20% or more, more preferably 22% or more; the molecular sieve activated powder can absorb specific harmful gas molecules, such as hydrogen sulfide, carbon dioxide and other acidic gases. The source of the molecular sieve activating powder is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the invention, the air filter paper comprises 10-20 parts by weight of molecular sieve activation powder. In a preferred embodiment of the present invention, the air filter paper comprises 20 parts by weight of molecular sieve activation powder; in another preferred embodiment of the present invention, the air filter paper comprises 15 parts by weight of molecular sieve activation powder.
In the present invention, the dispersant is preferably a cationic quaternary ammonium salt dispersant. The source of the dispersant in the present invention is not particularly limited, and commercially available products known to those skilled in the art may be used. In the present invention, the air filter paper includes 0.3 to 0.6 parts by weight of a dispersant, preferably 0.5 to 0.6 parts by weight.
In the present invention, the wood pulp fibers include softwood fibers and hardwood fibers; wherein the softwood fibers are longer and the hardwood fibers are shorter. In the present invention, the length of the softwood fibers is preferably 2mm to 10mm, more preferably 2.56mm to 4.08 mm; the length-diameter ratio of the softwood fibers is preferably (10-80): 1. in the present invention, the hardwood fibers preferably have a fiber length of 0.5mm to 1.5mm, more preferably 0.8mm to 1.2 mm; the length-diameter ratio of the hardwood fibers is preferably (10-70): 1. in the invention, the wood pulp fiber mainly plays a role in improving the air permeability in the product, and can effectively block harmful particles under the combined action of other components, thereby ensuring that the product has higher filtering efficiency. The source of the wood pulp fibers is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used. In the present invention, the air filter paper includes 5 to 15 parts by weight of wood pulp fiber, preferably 8 to 10 parts by weight.
In the present invention, the binder is preferably an acrylic emulsion having a mass concentration of 1.5% to 10%, and more preferably an acrylic emulsion having a mass concentration of 3% to 5%. The source of the binding agent is not particularly limited, and the binding agent can be diluted into 1.5-10% solution for use by adopting 40-55% acrylic emulsion by mass concentration which is well known by the technicians in the field. In the present invention, the air filter paper includes 5 to 15 parts by weight of the binder, preferably 8 to 12 parts by weight.
The air filter paper provided by the invention adopts the components with specific dosage, the components have good interaction, the prepared air filter paper has good high temperature resistance, low wind resistance and high mechanical strength, can effectively block harmful particles, has high integral filtering efficiency, and can efficiently filter acidic gases such as hydrogen sulfide, carbon dioxide and the like in air.
The invention also provides a preparation method of the air filter paper, which comprises the following steps:
a) mixing main glass fiber, molecular sieve activated powder and water, and pulping for the first time in the presence of a dispersant to obtain first slurry; simultaneously mixing wood pulp fibers with water, and pulping for the second time to obtain a second pulp; then mixing the first sizing agent and the second sizing agent with water to obtain fiber cotton pulp;
b) molding the fiber cotton pulp obtained in the step a) to obtain a wet paper blank;
c) and c) gluing the wet paper blank obtained in the step b) by using a binding agent, and drying to obtain the air filter paper.
Firstly, mixing main glass fiber, molecular sieve activated powder and water, and pulping for the first time in the presence of a dispersing agent to obtain first slurry; simultaneously mixing wood pulp fibers with water, and pulping for the second time to obtain a second pulp; and then mixing the first sizing agent and the second sizing agent with water to obtain the fiber cotton pulp. In the present invention, the main glass fiber, the molecular sieve activating powder, the dispersing agent and the wood pulp fiber are the same as those described in the above technical solution, and are not described herein again.
The present invention is not particularly limited to the beating equipment, and a beating machine well known to those skilled in the art is used. Under the action of the dispersing agent, the main glass fiber and the molecular sieve activated powder can be uniformly dispersed in water to obtain the first slurry. In the present invention, the fiber concentration of the first slurry is preferably 0.8% to 2%, more preferably 0.8% to 1.8%; the invention determines the water adding amount according to the water adding amount.
In the invention, the beating degree of the second beating is preferably 55-65 DEG SR; thereby ensuring that the wood pulp fiber can be devillicate and broomed to obtain the second sizing agent. In the present invention, the fiber concentration of the second slurry is preferably 3% to 10%, more preferably 4% to 6%; the invention determines the water adding amount according to the water adding amount.
The equipment for mixing the first slurry and the second slurry with water is not particularly limited in the invention, and a slurry preparation tank well known to those skilled in the art is preferably adopted. In the invention, the fiber concentration of the fiber cotton pulp is preferably 0.05-0.4%, more preferably 0.1-0.3%; the invention determines the water adding amount according to the water adding amount.
After the fiber cotton pulp is obtained, the obtained fiber cotton pulp is molded to obtain a wet paper blank. In the present invention, the forming process preferably includes:
conveying the fiber cotton pulp obtained in the step a) to a forming mesh belt to form a wet paper blank, and simultaneously absorbing and removing excessive moisture in the wet paper blank through a vacuum pump to obtain the wet paper blank with the thickness of 0.2-0.6 mm and the moisture content of 45-55%. In the present invention, the thickness of the wet paper blank obtained is preferably 0.3mm to 0.4mm, and the water content is preferably 50% to 55%.
After the wet paper blank is obtained, the obtained wet paper blank is sized by adopting a binding agent, and air filter paper is obtained after drying. In the present invention, the binding agent is the same as described in the above technical solution, and is not described herein again.
In the present invention, the sizing process is preferably specifically:
uniformly applying a bonding agent on the surface of the wet paper blank obtained in the step b) to enable the bonding agent to permeate into the paper blank, and simultaneously sucking and removing the redundant bonding agent through a vacuum pump, wherein the glue application amount is 0.5-3 times of the weight of the wet paper blank, so that the glued wet paper blank is obtained. In the present invention, the sizing amount is preferably 1 time or more of the weight of the wet base paper.
The drying equipment is not particularly limited in the present invention, and an oven known to those skilled in the art may be used. In the invention, the drying temperature is preferably 80-160 ℃, and more preferably 100-120 ℃; the drying time is preferably 15 to 40min, and more preferably 15 to 20 min.
The invention provides air filter paper, which comprises the following components: 100 parts by weight of main body glass fiber; 10-20 parts of molecular sieve activation powder; 0.3 to 0.6 parts by weight of a dispersant; 5-15 parts of wood pulp fiber; 5-15 parts of a binding agent; the main glass fiber is prepared from (1-4) by mass: 1 chopped continuous glass fiber and glass fiber cotton. Compared with the prior art, the air filter paper provided by the invention adopts the components with specific dosage, the components have good interaction, the prepared air filter paper has good high temperature resistance, low wind resistance and high mechanical strength, can effectively block harmful particles, has high integral filtering efficiency, and can efficiently filter acid gases such as hydrogen sulfide, carbon dioxide and the like in air. The experimental result shows that the air filter paper provided by the invention can resist the high temperature of more than 800 ℃, the wind resistance is 270N-310N, the strength is 0.6 MPa-1.0 MPa, and the stiffness is 1200 mg-1400 mg; the product can absorb hydrogen sulfide, carbon dioxide and other acidic gases in the air, and the filtering efficiency is 99.965-99.985%.
In addition, the preparation method provided by the invention has the advantages of simple process and low cost, and is suitable for large-scale industrial production.
In order to further illustrate the present invention, the following detailed description of the technical solutions provided by the present invention is provided with reference to examples. The fiber length of the high silica type chopped glass fiber used in the following examples of the invention is 6mm to 30 mm; the used dispersant is cationic quaternary ammonium salt dispersant; the wood pulp fibers used comprise softwood fibers and hardwood fibers, the length of the softwood fibers is 2.56-4.08 mm, the length-diameter ratio is more than 70 times, the length of the hardwood fibers is 0.8-1.2 mm, and the length-diameter ratio is more than 60 times; the length of the alkali-free chopped glass fiber is 6-30 mm, and the content of sodium oxide is 0-2%; the length of the used medium-alkali chopped glass fiber is 6-30 mm, and the content of sodium oxide is 8-12%; the length of the used high-alkali chopped glass fiber is 6-30 mm, and the content of sodium oxide is more than or equal to 13%; the binding agent is acrylic emulsion with the mass concentration of 40-55% and is diluted into solution with the concentration of 1.5-10%.
Example 1
(1) Adding 80kg of high silica type chopped glass fiber, 20kg of glass fiber cotton and 20kg of molecular sieve activation powder into a No. 1 beater added with water in advance, ensuring that the fiber concentration is 1.6%, starting the beater, simultaneously adding 0.5kg of dispersing agent, and carrying out primary beating until the fiber is uniformly dispersed in the water to obtain a first slurry.
(2) Independently adding 10kg of wood pulp fibers into a No. 2 beater added with water in advance, ensuring that the fiber concentration is 5%, starting the beater to carry out secondary beating, ensuring that the beating degree of the pulp is 60 DEG SR, and ensuring that the wood pulp fibers can be broomed to obtain a second pulp.
(3) And (3) conveying the first slurry obtained in the step (1) and the second slurry obtained in the step (2) to a slurry preparation pool, and continuously adding clear water to keep the fiber concentration at 0.2% to obtain the fiber cotton slurry.
(4) And (3) opening the forming mesh belt, conveying the fiber cotton pulp obtained in the step (3) to the forming mesh belt to form a wet paper blank, and simultaneously sucking excessive moisture in the wet paper blank by a first vacuum pump to obtain the wet paper blank with the thickness of 0.3mm and the moisture content of 51%.
(5) Uniformly applying the diluted 3% acrylic emulsion on the surface of the wet paper blank obtained in the step (4) to enable the acrylic emulsion to penetrate into the paper blank, and simultaneously sucking excess bonding agent through a second vacuum pump, wherein the glue application amount is more than 1 time of the weight of the wet paper blank; and then conveying the wet paper blank into a drying oven for drying at the drying temperature of 110 ℃ for 20min, and finishing drying to obtain the air filter paper.
Through detection, the air filter paper provided by the embodiment 1 of the invention can resist the high temperature of 805 ℃, the wind resistance is 280N, the strength is 0.6MPa, and the stiffness is 1200 mg; the overall filtering efficiency of the product is 99.975%, and the product can absorb acid gases such as hydrogen sulfide, carbon dioxide and the like in the air.
Example 2
(1) Adding 30kg of alkali-free chopped glass fibers, 50kg of medium-alkali chopped glass fibers, 20kg of glass fiber cotton and 15kg of molecular sieve activation powder into a No. 1 beater which is added with water in advance, ensuring that the fiber concentration is 1.8%, starting the beater, simultaneously adding 0.6kg of dispersing agent, and carrying out primary beating until the fibers are uniformly dispersed in the water to obtain a first slurry.
(2) And (3) independently adding 8kg of wood pulp fibers into a No. 2 beater into which water is added in advance, ensuring that the fiber concentration is 4%, starting the beater to carry out secondary beating, ensuring that the beating degree of the pulp is 65 DEG SR, and ensuring that the wood pulp fibers can be broomed to obtain a second pulp.
(3) And (3) conveying the first slurry obtained in the step (1) and the second slurry obtained in the step (2) to a slurry preparation pool, and continuously adding clear water to keep the fiber concentration at 0.1% to obtain the fiber cotton slurry.
(4) And (3) opening the forming mesh belt, conveying the fiber cotton pulp obtained in the step (3) to the forming mesh belt to form a wet paper blank, and simultaneously sucking excessive moisture in the wet paper blank by a first vacuum pump to obtain the wet paper blank with the thickness of 0.2mm and the moisture content of 55%.
(5) Uniformly applying the diluted acrylic emulsion with the concentration of 5% on the surface of the wet paper blank obtained in the step (4) to enable the acrylic emulsion to permeate into the paper blank, and simultaneously sucking excess bonding agent through a second vacuum pump, wherein the glue application amount is more than 1 time of the weight of the wet paper blank; and then conveying the wet paper blank to a drying oven for drying at the drying temperature of 100 ℃ for 18min, and finishing drying to obtain the air filter paper.
Through detection, the air filter paper provided by the embodiment 2 of the invention can resist the high temperature of 800 ℃, the wind resistance is 270N, the strength is 0.8MPa, and the stiffness is 1400 mg; the overall filtering efficiency of the product is 99.985 percent, and the product can absorb acid gases such as hydrogen sulfide, carbon dioxide and the like in the air.
Example 3
(1) Adding 10kg of high-alkali chopped glass fiber, 40kg of high-silica chopped glass fiber, 50kg of glass fiber cotton and 20kg of molecular sieve activation powder into a No. 1 beater which is added with water in advance, ensuring that the fiber concentration is 0.8%, starting the beater, simultaneously adding 0.5kg of dispersing agent, and carrying out primary beating until the fibers are uniformly dispersed in the water to obtain a first slurry.
(2) Independently adding 10kg of wood pulp fibers into a No. 2 beater added with water in advance, ensuring that the fiber concentration is 6%, starting the beater to carry out secondary beating, ensuring that the pulp beating degree is 55 DEG SR, and ensuring that the wood pulp fibers can be broomed to obtain second pulp.
(3) And (3) conveying the first slurry obtained in the step (1) and the second slurry obtained in the step (2) to a slurry preparation pool, and continuously adding clear water to keep the fiber concentration at 0.3% to obtain the fiber cotton slurry.
(4) And (3) opening the forming mesh belt, conveying the fiber cotton pulp obtained in the step (3) to the forming mesh belt to form a wet paper blank, and simultaneously sucking excessive moisture in the wet paper blank by a first vacuum pump to obtain the wet paper blank with the thickness of 0.4mm and the moisture content of 50%.
(5) Uniformly applying the diluted acrylic emulsion with the concentration of 4% on the surface of the wet paper blank obtained in the step (4) to enable the acrylic emulsion to permeate into the paper blank, and simultaneously sucking excess bonding agent through a second vacuum pump, wherein the glue application amount is more than 1 time of the weight of the wet paper blank; and then conveying the wet paper blank into a drying oven for drying at the drying temperature of 120 ℃ for 15min, and finishing drying to obtain the air filter paper.
Through detection, the air filter paper provided by the embodiment 3 of the invention can resist the high temperature of 800 ℃, the wind resistance is 310N, the strength is 1.0MPa, and the stiffness is 1300 mg; the integral filtering efficiency of the product is 99.965%, and the product can absorb acid gases such as hydrogen sulfide, carbon dioxide and the like in the air.
Comparative example 1
(1) Adding 80kg of high silica type chopped glass fiber and 40kg of glass fiber cotton into a No. 1 beater added with water in advance, ensuring that the fiber concentration is 1.6%, starting the beater, simultaneously adding 0.5kg of dispersing agent, and carrying out primary beating until the fibers are uniformly dispersed in the water to obtain a first slurry.
Steps (2) to (5) were carried out in the same manner as in example 1 to obtain air-filtration paper.
Through detection, the air filter paper provided by the comparative example 1 can resist the high temperature of 750 ℃, the wind resistance is 315N, the strength is 0.5MPa, and the stiffness is 1100 mg; the overall filtering efficiency of the product is 91.023%, and acid gases such as hydrogen sulfide and carbon dioxide in the air cannot be absorbed.
Comparative example 2
(1) Adding 100kg of high silica type chopped glass fiber and 20kg of glass fiber cotton into a No. 1 beater added with water in advance, ensuring that the fiber concentration is 1.6%, starting the beater, simultaneously adding 0.5kg of dispersing agent, and carrying out primary beating until the fibers are uniformly dispersed in the water to obtain a first slurry.
Steps (2) to (5) were carried out in the same manner as in example 1 to obtain air-filtration paper.
Through detection, the air filter paper provided by the comparative example 2 can resist the high temperature of 800 ℃, the wind resistance is 320N, the strength is 0.45MPa, and the stiffness is 1150 mg; the overall filtering efficiency of the product is 93.124%, and acid gases such as hydrogen sulfide and carbon dioxide in the air cannot be absorbed.
Comparative example 3
(1) Adding 80kg of high silica type chopped glass fiber, 20kg of glass fiber cotton and 20kg of molecular sieve activation powder into a No. 1 beater added with water in advance, ensuring that the fiber concentration is 1.6%, starting the beater, simultaneously adding 0.5kg of dispersing agent, and carrying out primary beating until the fiber is uniformly dispersed in the water to obtain a first slurry.
(2) And (2) conveying the first pulp obtained in the step (1) to a pulp mixing pool, and continuously adding clear water to keep the fiber concentration at 0.2% to obtain the fiber cotton pulp.
(3) And (3) opening the forming mesh belt, conveying the fiber cotton pulp obtained in the step (2) to the forming mesh belt to form a wet paper blank, and simultaneously sucking excessive moisture in the wet paper blank by a first vacuum pump to obtain the wet paper blank with the thickness of 0.3mm and the moisture content of 51%.
(4) Uniformly applying the diluted 3% acrylic emulsion on the surface of the wet paper blank obtained in the step (3) to enable the acrylic emulsion to penetrate into the paper blank, and simultaneously, absorbing and removing redundant bonding agent through a second vacuum pump, wherein the glue application amount is more than 1 time of the weight of the wet paper blank; and then conveying the wet paper blank into a drying oven for drying at the drying temperature of 110 ℃ for 20min, and finishing drying to obtain the air filter paper.
Through detection, the air filter paper provided by the comparative example 3 can resist the high temperature of 800 ℃, the wind resistance is 325N, the strength is 0.45MPa, and the stiffness is 1120 mg; the integral filtering efficiency of the product is 89.258%, and the product can absorb acid gases such as hydrogen sulfide, carbon dioxide and the like in the air.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An air filter paper comprising the following components:
100 parts by weight of main body glass fiber;
10-20 parts of molecular sieve activation powder;
0.3 to 0.6 parts by weight of a dispersant;
5-15 parts of wood pulp fiber;
5-15 parts of a binding agent;
the main glass fiber is prepared from (1-4) by mass: 1, short-cut continuous glass fiber and glass fiber cotton;
the wood pulp fibers comprise softwood fibers and hardwood fibers; the length of the softwood fiber is 2 mm-10 mm, and the length of the hardwood fiber is 0.5 mm-1.5 mm.
2. An air-filter paper as in claim 1, wherein the chopped continuous glass fibers comprise one or more of high silica type chopped fibers, alkali-free chopped glass fibers, medium alkali chopped glass fibers and high alkali chopped glass fibers.
3. The air filter paper as recited in claim 1, wherein the binder is acrylic emulsion with a mass concentration of 1.5-10%.
4. A method of making air-filter paper according to any of claims 1 to 3, comprising the steps of:
a) mixing main glass fiber, molecular sieve activated powder and water, and pulping for the first time in the presence of a dispersant to obtain first slurry; simultaneously mixing wood pulp fibers with water, and pulping for the second time to obtain a second pulp; then mixing the first sizing agent and the second sizing agent with water to obtain fiber cotton pulp;
b) molding the fiber cotton pulp obtained in the step a) to obtain a wet paper blank;
c) and c) gluing the wet paper blank obtained in the step b) by using a binding agent, and drying to obtain the air filter paper.
5. The method of claim 4, wherein the fiber concentration of the first slurry in step a) is 0.8% to 2%; the fiber concentration of the second slurry is 3% -10%; the fiber concentration of the fiber cotton pulp is 0.05-0.4%.
6. The method of claim 4, wherein the second beating in step a) has a beating degree of 55 ° SR to 65 ° SR.
7. The method according to claim 4, wherein the forming in step b) comprises:
conveying the fiber cotton pulp obtained in the step a) to a forming mesh belt to form a wet paper blank, and simultaneously absorbing and removing excessive moisture in the wet paper blank through a vacuum pump to obtain the wet paper blank with the thickness of 0.2-0.6 mm and the moisture content of 45-55%.
8. The method according to claim 4, wherein the sizing in step c) is carried out by:
uniformly applying a bonding agent on the surface of the wet paper blank obtained in the step b) to enable the bonding agent to permeate into the paper blank, and simultaneously sucking and removing the redundant bonding agent through a vacuum pump, wherein the glue application amount is 0.5-3 times of the weight of the wet paper blank, so that the glued wet paper blank is obtained.
9. The method according to claim 4, wherein the drying in step c) is carried out at a temperature of 80 to 160 ℃ for a time of 15 to 40 min.
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