CN114214874B - Air filter paper coating glue solution and application thereof - Google Patents
Air filter paper coating glue solution and application thereof Download PDFInfo
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- CN114214874B CN114214874B CN202111544671.0A CN202111544671A CN114214874B CN 114214874 B CN114214874 B CN 114214874B CN 202111544671 A CN202111544671 A CN 202111544671A CN 114214874 B CN114214874 B CN 114214874B
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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
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
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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
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
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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
- 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
- D21H21/14—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 characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/50—Spraying or projecting
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention provides an air filter paper coating glue solution, which comprises the following components: primary coating glue solution and secondary coating glue solution; the primary coating glue solution comprises: acrylic emulsion, cross-linking agent liquid and modified wax emulsion; the secondary coating glue solution comprises: acrylic emulsion, carboxymethyl cellulose, modified wax emulsion, and silicone emulsion. The invention also provides a preparation method of the air filter paper. The air filter paper coated twice has excellent moisture resistance, high retention rate of wet stiffness and small elongation of wet deformation, greatly reduces the moisture absorption deformation of the filter element of the filter, and ensures the use effect in the humid environment of rainy days. The preparation method of the filter paper provided by the invention has the advantages of simple production process, easy equipment operation, small dosage of the water-resistant agent and lower production cost, and is beneficial to manufacturing the automobile air filter paper with excellent moisture resistance.
Description
Technical Field
The invention belongs to the technical field of filter materials, and particularly relates to an air filter paper coating glue solution and application thereof, in particular to an air filter paper coating glue solution for a humidity-resistant automobile, and a preparation method and application thereof.
Background
The air filter for the automobile plays a role in filtering air entering the engine, filters fine particles in the air, ensures normal operation of the engine, reduces the degree of wear of parts and prolongs the service life of the engine, and is characterized in that the filter element is made of air filter paper.
The prior art manufactured automobile air filter paper has the following defects in use: the filter paper is coated once in the manufacturing process, the adding amount of the water repellent agent is large, the effect is poor, and the manufacturing cost is increased; the filter paper has poor moisture resistance, and when the filter paper is used in wet and rainy days, a filter element made of the filter paper has low stiffness, generates size extension, expansion deformation and bending and folding (folding, and gaps among the filter paper are reduced or are close to each other), reduces the air inlet area of the filter element, causes the problems of insufficient air inlet amount of an engine during the driving of an automobile, insufficient fuel oil combustion, reduction of the output power and the heat efficiency of the engine and the like, increases the running cost of the automobile, and ensures that the automobile cannot run smoothly; and the tail gas which is not fully combusted is discharged into the atmosphere, and the pollution to the environment is also increased.
Disclosure of Invention
The coating glue solution with the moisture resistance for the air filter paper provided by the invention has the advantages that the processed filter paper has excellent moisture resistance by a secondary coating method, the moisture absorption performance of the filter paper is reduced, the size elongation deformation condition of a filter element is improved, and the safety and the economical efficiency of a vehicle in driving are ensured.
The invention provides an air filter paper coating glue solution, which comprises the following components:
primary coating glue solution and secondary coating glue solution;
the primary coating glue solution comprises: acrylic emulsion, cross-linking agent liquid and modified wax emulsion;
the secondary coating glue solution comprises: acrylic emulsion, carboxymethyl cellulose, modified wax emulsion, and silicone emulsion.
Preferably, the primary coating glue solution further comprises: water;
the total mass concentration of the acrylic emulsion, the cross-linking agent liquid and the modified wax emulsion in the primary coating glue solution is 16-18%.
Preferably, the secondary coating glue solution further comprises: water;
the concentration of the total mass of the acrylic emulsion, the carboxymethyl cellulose, the modified wax emulsion and the organic silicon emulsion in the secondary coating glue solution is 4-6%.
Preferably, the mass ratio of the acrylic emulsion, the cross-linking agent liquid and the modified wax emulsion in the primary coating glue liquid is (89-93): (4-6): (3-5).
Preferably, the mass ratio of the acrylic emulsion, the carboxymethyl cellulose, the modified wax emulsion and the organic silicon emulsion in the secondary coating glue solution is (57-69): (5-8): (10-15): (16 to 20).
The invention provides a preparation method of air filter paper, which comprises the following steps:
sequentially performing primary coating and secondary coating on the surface of the filter paper base paper and then drying to obtain air filter paper;
the primary coating glue solution is the primary coating glue solution in the technical scheme;
the glue solution for secondary coating is the glue solution for secondary coating in the technical scheme.
Preferably, the thickness of the filter paper base paper is 400-420 μm; the air permeability is 190 to 200l/m 2 -s; the maximum aperture is 45-50 μm; the longitudinal wet strength is 4-5N/15 mm.
Preferably, the one-time coating is roll coating and is double-sided coating.
Preferably, the secondary coating is spray coating and is single-sided coating.
Preferably, the dryness of the web during the secondary coating process is 55 to 60%.
The air filter paper coated twice has excellent moisture resistance, high moisture stiffness retention rate and small wet deformation elongation, greatly reduces the moisture absorption deformation of the filter element of the filter, and ensures the use effect in a rainy and humid environment. The preparation method of the filter paper provided by the invention has the advantages of simple production process, easy equipment operation, small dosage of the water-resistant agent and lower production cost, and is beneficial to manufacturing the automobile air filter paper with excellent moisture resistance. The invention applies two-time coating mode to the air filter paper, and is completed in the machine once, thus ensuring the continuity of production; the secondary coating is carried out on the air inlet windward side of the filter paper to form a water-resistant coating layer, and the coating amount is small.
Drawings
FIG. 1 is a schematic view of roll coating according to an embodiment of the present invention;
fig. 2 is a schematic diagram of spray coating in an embodiment of the invention.
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention provides an air filter paper coating glue solution, which comprises the following components: primary coating glue solution and secondary coating glue solution;
the primary coating glue solution comprises:
acrylic emulsion, cross-linking agent liquid and modified wax emulsion.
In the present invention, the crosslinking agent liquid is preferably an MF crosslinking agent liquid.
In the present invention, the modified wax emulsion is preferably a modified polyethylene wax emulsion.
In the present invention, the primary coating glue solution preferably further comprises: and (3) water.
In the present invention, the concentration of the total mass of the acrylic emulsion, the crosslinking agent liquid and the modified wax emulsion in the primary coating dope (in the case of water) is preferably 16 to 18%, more preferably 16.5 to 17.5%, most preferably 17%.
In the invention, the mass ratio of the acrylic emulsion, the cross-linking agent liquid and the modified wax emulsion in the primary coating glue liquid is preferably (89-93): (4-6): (3 to 5), more preferably (90 to 92): (4.5-5.5): (3.5 to 4.5), most preferably 91:5:4.
in the present invention, the preparation method of the primary coating glue solution preferably includes:
mixing the acrylic emulsion, the cross-linking agent liquid, the modified wax emulsion and water to obtain a primary coating glue solution.
In the present invention, the mixing is preferably:
adding water, acrylic emulsion, cross-linking agent liquid and modified wax emulsion in sequence for mixing; the time interval for adding each component is preferably 5 to 10min, more preferably 6 to 9min, and most preferably 7 to 8min.
In the present invention, the mixing is preferably performed under stirring; the mixing is preferably carried out in a mixing tank with stirring, and the primary coating dope of the desired concentration is prepared by dilution by mixing with water.
In the invention, the secondary coating glue solution comprises:
acrylic emulsions, carboxymethylcellulose (CMC), modified wax emulsions, and silicone emulsions.
In the present invention, the modified wax emulsion is preferably a modified polyethylene wax emulsion.
In the present invention, the silicone emulsion is preferably an aqueous silicone emulsion.
In the present invention, the secondary coating glue solution preferably further includes: and (3) water.
In the present invention, the concentration of the total mass of the acrylic emulsion, the carboxymethyl cellulose (CMC), the modified wax emulsion and the silicone emulsion in the secondary coating dope (in the case of water) is preferably 4 to 6%, more preferably 4.5 to 5.5%, and most preferably 5%.
In the invention, the mass ratio of the acrylic emulsion, the carboxymethyl cellulose, the modified wax emulsion and the silicone emulsion in the secondary coating glue solution is preferably (57-69): (5-8): (10-15): (16 to 20), more preferably (59 to 66): (6-7): (11-14): (17 to 19), most preferably 63:6.5:12.5:18.
in the present invention, the preparation method of the secondary coating glue solution preferably includes:
mixing the acrylic emulsion, the carboxymethyl cellulose, the modified wax emulsion, the organic silicon emulsion and water to obtain a secondary coating glue solution.
In the present invention, the mixing is preferably:
sequentially adding water, acrylic emulsion, carboxymethyl cellulose, modified wax emulsion and organic silicon emulsion for mixing; the time interval for adding each component is preferably 5 to 10min, more preferably 6 to 9min, and most preferably 7 to 8min.
In the present invention, the mixing is preferably performed under stirring; the mixing is preferably carried out in a mixing tank with stirring means; and mixing and diluting the mixture with water to prepare a secondary coating glue solution with the required concentration.
The invention provides a preparation method of air filter paper, which comprises the following steps:
sequentially performing primary coating and secondary coating on the surface of the filter paper base paper and then drying to obtain air filter paper;
the primary coating glue solution is the primary coating glue solution in the technical scheme;
the glue solution for secondary coating is the glue solution for secondary coating in the technical scheme.
In the present invention, the preparation method of the filter paper-based paper preferably includes:
mixing needle pulp, eucalyptus pulp and chemical fiber to obtain a mixture;
and sequentially pulping, defibering, pulping, drifting, forming, drying and rolling the mixture to obtain the filter paper base paper.
In the present invention, said chemical fibers are preferably selected from PET (polyethylene terephthalate) chemical fibers (1.5d 6 mm).
In the present invention, the mass ratio of the softwood pulp, the eucalyptus pulp and the chemical fibers is preferably (42 to 48): (47 to 55): (3 to 5), more preferably (44 to 46): (49-52): (3.5 to 4.5), most preferably 45:50:4.
in the present invention, the mixture preferably further comprises:
a wet strength agent.
In the present invention, the wet strength agent is preferably PAE (polyamide epichlorohydrin resin).
In the present invention, the wet strength agent is preferably used in an amount of 1 to 3%, more preferably 1.5 to 2.5%, most preferably 2% of the oven dry mass of the fibres in the mixture.
In the present invention, a wet strength agent is added during the preparation of the filter paper base paper to ensure the wet strength of the paper web upon coating.
In the present invention, the mixture preferably includes:
long fibers (softwood pulp), short fibers (eucalyptus pulp), synthetic fibers (chemical fibers), and wet strength agents.
In the present invention, the mass content of the long fiber in the mixture is preferably 43 to 47%, more preferably 44 to 46%, and most preferably 45%; the mass content of the short fibers in the mixture is preferably 48 to 52%, more preferably 49 to 51%, and most preferably 50%; the mass content of the synthetic fibers in the mixture is preferably 3 to 7%, more preferably 4 to 6%, and most preferably 5%; the wet strength agent preferably has a mass which is 1 to 2%, more preferably 1.3 to 1.7%, most preferably 1.5% of the oven dry mass of the fibres in the mixture.
In the present invention, the grammage of the filter paper-based paper is preferably 85 to 95g/m 2 More preferably 88 to 92g/m 2 Most preferably 91g/m 2 (ii) a The thickness is preferably 400 to 420 μm, more preferably 405 to 415 μm, and most preferably 410 μm; the air permeability is preferably 190 to 200l/m 2 -s, more preferably 193 to 197l/m 2 S, most preferably 195l/m 2 -s; the maximum pore size is preferably 45 to 50 μm, more preferably 46 to 49 μm, most preferably 47 to 48 μm; the longitudinal wet strength is preferably 4 to 5N/15mm, morePreferably 4.3 to 4.7N/15mm, most preferably 4.5N/15mm.
In the present invention, the primary coating method is preferably roll coating, and is preferably performed by using a roll coating apparatus shown in fig. 1, wherein 1 is filter paper base paper; 2 is a coating rubber roller; 3, coating a steel roller; 4 is primary coating glue solution; 5. 6 is a gap; and 7, filter paper after one-time coating.
In the present invention, the one-time coating is preferably a double-side coating.
In the present invention, the method of one-time coating more preferably includes:
the filter paper base paper 1 enters between the coating rubber roll 2 and the coating steel roll 3 along the rotating advancing direction of the two rolls, and the coating steel roll 3 is a driving roll and drives the filter paper base paper 1 and the coating rubber roll 2 to run together; the primary coating glue solution 4 is injected into gaps 5 and 6 formed by the coating rubber roller 2 and the filter paper base paper 1 and the coating steel roller 3 and the filter paper base paper 1, and the filter paper base paper 1 is immersed into the primary coating glue solution 4 to obtain a double-sided dipping coating effect; the gap and the pressure between the coating rubber roller 2 and the coating steel roller 3 can be adjusted, the filter paper base paper 1 is extruded and controlled by adjusting the gap and the pressure between the two rollers during operation, the glue coating amount is ensured, and the required filter paper quantification is obtained.
In the present invention, the amount of glue applied in the one-time coating process is preferably 14 to 18%, more preferably 15 to 17%, and most preferably 16% of the oven-dry basis amount of the finished filter paper (air filter paper).
In the present invention, it is preferable that the coating composition further comprises, after the primary coating:
and drying the product after primary coating and then performing secondary coating.
In the present invention, the drying is preferably performed so that the dryness of the product after the primary coating is 55 to 60%, more preferably 56 to 59%, and most preferably 57 to 58%.
In the present invention, the method of the secondary coating is preferably spray coating; preferably in the spray coating apparatus shown in fig. 2, 7 is a filter paper after one coating; 8. 9 is a drying cylinder; 10 is secondary coating glue solution; 11 is a spray coating device; 12 is a filter paper after the second coating.
In the present invention, the secondary coating is preferably a single-sided coating.
In the present invention, the method of secondary coating more preferably includes:
and (3) when the paper web 7 after primary coating is moved between the drying cylinder 8 and the drying cylinder 9, secondary coating is carried out, secondary coating glue solution 10 is atomized by a coating spray device 11 and sprayed on the paper surface of the filter paper 7 after primary coating, the secondary coating is single-side coating, the coating surface is the windward side of the filter paper, air enters, the pressure of the secondary coating glue solution 10 entering the spray coating device 11 is adjusted at a certain running speed, the glue coating amount can be controlled, and the required filter paper performance is obtained.
In the invention, the dryness of the paper web in the secondary coating process is preferably 55-60%, more preferably 56-59%, and most preferably 57-58%.
In the invention, the secondary coating glue solution contains carboxymethyl cellulose, so that the leveling property and the water retention property of the coating liquid are good, and the phenomenon that the moisture resistance is reduced due to the uneven formed spraying film layer caused by too fast drying in the process before the secondary coating glue solution reaches the paper surface after being atomized by a spray coating device can be avoided.
In the present invention, the coating amount of the secondary coating is preferably 4 to 6%, more preferably 4.5 to 5.5%, and most preferably 5% of the oven dry basis amount of the finished filter paper (air filter paper).
In the present invention, the drying after the secondary coating is preferably performed so that the dryness of the air filter paper is 93 to 97%, more preferably 94 to 96%, and most preferably 95% (this means the product dryness).
In the invention, the process route of the preparation method of the air filter paper is as follows:
filter paper base paper → preparation of primary coating glue solution, coating → drying → preparation of secondary coating glue solution, coating → drying → filter paper.
In the present invention, the total glue solution usage (total amount of the primary coating glue solution and the secondary coating glue solution) in the primary coating and the secondary coating processes is preferably 18 to 24%, more preferably 20 to 22%, and most preferably 21% of the oven dry basis of the finished filter paper (air filter paper).
The gram weight of the air filter paper prepared by the method provided by the invention is preferably 110-120 g/m 2 (ii) a The thickness is preferably 380 to 410 mu m; the air permeability is preferably 140 to 160l/m 2 -s; the maximum pore diameter is preferably 38 to 42 mu m; the wet stiffness retention rate (JB/T12651.1-2016; the wet set elongation is preferably 0.65 to 0.4%.
The air filter paper coated twice has excellent moisture resistance, high retention rate of wet stiffness and small elongation of wet deformation, greatly reduces the moisture absorption deformation of the filter element of the filter, and ensures the use effect in the humid environment of rainy days. The preparation method of the filter paper provided by the invention has the advantages of simple production process, easy operation of equipment, small dosage of the water repellent agent and lower production cost, and is beneficial to manufacturing the automobile air filter paper with excellent moisture resistance. The air filter paper is coated twice and finished once in the machine, so that the production continuity is ensured; the coating is coated on the air inlet windward side of the filter paper for the second time to form a water-resistant coating layer, and the coating amount is small.
The raw materials used in the following examples of the present invention are all commercially available products.
Example 1
Preparation of primary coating glue solution:
weighing acrylic emulsion, MF cross-linking agent liquid and LD-F01 modified wax emulsion (modified polyethylene wax emulsion), respectively adding into a mixing tank with a stirring device, mixing with water for dilution, and fully stirring and mixing for later use; the mass concentration of the primary coating glue solution is 16%, wherein the mass ratio of the acrylic resin, the MF crosslinking agent and the LD-F01 modified wax emulsion is as follows: 93wt%:4wt%:3wt%; the following sequence and stirring time were used: water → acrylic acid emulsion (5 min) → MF crosslinking agent liquid (10 min) → modified wax emulsion, mixing, and stirring for another 20min for later use.
Preparation of secondary coating glue solution:
weighing acrylic emulsion, CMC carboxymethyl cellulose, LD-F01 modified wax emulsion (modified polyethylene wax emulsion) and LD-K12 water-based organosilicon emulsion, respectively adding into a mixing tank with a stirring device, mixing with water, diluting, and stirring thoroughly; the mass concentration of the secondary coating glue solution is 4%; wherein the mass ratio of the acrylic emulsion to the CMC to the LD-F01 modified wax emulsion to the LD-K12 water-based organic silicon emulsion is as follows: 69wt%:5wt%:10wt%:16wt%; the following sequence and time were used: water → acrylic acid emulsion (5 min) → CMC carboxymethyl cellulose (10 min) → LD-F01 modified wax emulsion (10 min) → LD-K12 aqueous silicone emulsion, mixing, and stirring for 20 min.
The parameters of the filter paper base paper are as follows: proportioning the slurry: long fibers (SBSK southern bleached softwood pulp) account for 45wt%; short fibers (SUZANO eucalyptus pulp) account for 50wt%; the synthetic fiber (PET chemical fiber 1.5d x 6mm) accounts for 5wt%, and the addition amount of the PAE wet strength agent is 1.5% of the oven dry mass of the fiber; indexes of filter paper base paper: gram weight 91.2g/m 2 (ii) a The thickness is 410 mu m; air permeability of 195.7l/m 2 -s; the maximum aperture is 48 mu m; wet tensile strength in machine direction 4.51N/15mm.
Carrying out primary coating on the filter paper base paper, wherein roll-type coating is shown in figure 1, the filter paper base paper 1 enters between a coating rubber roll 2 and a coating steel roll 3 along the rotating advancing direction of the two rolls, and the coating steel roll 3 is a driving roll and drives the base paper 1 and the coating rubber roll 2 to run together; the primary coating glue solution 4 is injected into gaps 5 and 6 formed by the coating rubber roller 2 and the base paper 1 and the coating steel roller 3 and the base paper 1, and the filter paper base paper 1 is immersed into the primary coating glue solution 4 to obtain a two-side dip coating effect; and (3) adjusting the gap between the coating rubber roller 2 and the coating steel roller 3 and the pressure during operation to squeeze and control the filter paper base paper 1, so as to obtain the glue coating amount required by the process, wherein the glue coating amount is 14% of the absolute dry weight of the finished filter paper.
The filter paper 7 after primary coating enters a drying part to be dried, and after the filter paper 7 enters a drying part to be coated for the second time, the spray coating is as shown in figure 2, when the paper web of the filter paper 7 after primary coating advances between a drying cylinder 8 and a drying cylinder 9, the glue solution 10 of secondary coating is atomized by a coating spray device 11 and then sprayed on the paper surface of the filter paper 7 after primary coating, and the coating surface is the windward surface of the filter paper where the air enters; when the secondary coating glue solution 10 is sprayed on the paper surface of the filter paper 7 after primary coating, the dryness of the paper web is 57 percent; adjusting the pressure of the secondary coating glue solution 10 entering the spray coating device 11 to obtain the glue coating amount required by the process, wherein the glue coating amount is 4% of the absolute dry weight of the finished filter paper; the filter paper 12 coated for the second time after being coated by the second coating glue solution 10 enters a drying part to be dried, and the automobile air filter paper with the moisture resistance is obtained; the total glue application was 18% of the oven dried basis weight of the finished filter paper.
According to JB/T12651.1-2016 part 1 of Filter paper for internal Combustion Engine Filter: technical Condition and JB/T12651.2-2016 part 2 of Filter paper for internal Combustion Engine Filter: according to the standard of detection methods, the performance of the air filter paper prepared in the embodiment 1 of the invention is detected; the detection result is that the gram weight of the air filter paper prepared in the embodiment 1 of the invention is as follows: 111.3g/m 2 (ii) a Thickness: 387 μm; air permeability: 156l/m 2 -s; maximum pore diameter: 42 μm; wet stiffness Retention (JB/T12651.1-2016: 82.2 percent; elongation at Wet deformation: 0.64 percent.
Example 2
Preparation of primary coating glue solution:
weighing acrylic emulsion, MF crosslinking agent liquid and modified wax emulsion (modified polyethylene wax emulsion), respectively adding into a mixing tank with a stirring device, mixing with water for dilution, and fully stirring and mixing for later use; the mass concentration of the primary coating glue solution is 17%; wherein the mass ratio of the acrylic resin, the MF crosslinking agent and the LD-F01 modified wax emulsion is as follows: 91wt%:5wt%:4wt%; the following sequence and stirring time were used for the addition: water → acrylic acid emulsion (5 min) → MF cross-linking agent solution (10 min) → modified wax emulsion, mixing, and stirring for 20 min.
Preparation of secondary coating glue solution:
weighing acrylic emulsion, CMC, LD-F01 modified wax emulsion (modified polyethylene wax emulsion) and LD-K12 water-based organic silicon emulsion, respectively adding into a mixing tank with a stirring device, mixing with water, diluting, and stirring thoroughly; the preparation mass concentration of the secondary coating glue solution is 5 percent; wherein the mass ratio of the acrylic emulsion to the CMC to the LD-F01 modified wax emulsion to the LD-K12 water-based organic silicon emulsion is as follows: 63wt%:6.5wt%:12.5wt%:18wt%; the following sequence and time were used: water → acrylic acid emulsion (5 min) → CMC carboxymethyl cellulose (10 min) → LD-F01 modified wax emulsion (10 min) → aqueous silicone emulsion, mixing, and stirring for 20 min.
The filter paper base paper was the same as in example 1.
Carrying out primary coating on filter paper base paper, wherein roll coating is shown in figure 1, the filter paper base paper 1 enters between a coating rubber roll 2 and a coating steel roll 3 along the rotation advancing direction of the two rolls, and the coating steel roll 3 is a driving roll and drives the base paper 1 and the coating rubber roll 2 to run together; the primary coating glue solution 4 is injected into gaps 5 and 6 formed by the coating rubber roller 2 and the filter paper base paper 1 and the coating steel roller 3 and the base paper 1, and the filter paper base paper 1 is immersed into the primary coating glue solution 4 to obtain a two-side dip coating effect; and (3) adjusting the gap between the coating rubber roller 2 and the coating steel roller 3 during operation and controlling the extrusion of the filter paper base paper 1 by the pressure to obtain the glue coating amount required by the process, wherein the glue coating amount is 16% of the oven dry ration of the finished filter paper.
The filter paper 7 after the primary coating enters a drying part for drying, and after the filter paper 7 enters a drying part for secondary coating, spraying and coating are carried out as shown in figure 2, when the paper web of the filter paper 7 after the primary coating advances between a drying cylinder 8 and a drying cylinder 9, a secondary coating glue solution 10 is atomized by a coating and spraying device 11 and then sprayed and coated on the paper surface of the filter paper 7 after the primary coating, and the coating surface is the windward surface of the filter paper, which is the air inlet surface of the filter paper; when the secondary coating glue solution 10 is sprayed on the paper surface of the filter paper 7 after primary coating, the dryness of the paper web is 57 percent; during operation, the pressure of the secondary coating glue solution 10 entering the spray coating device 11 is adjusted to obtain the glue coating amount required by the process, wherein the glue coating amount is 5% of the absolute dry weight of the finished filter paper; the filter paper 12 coated for the second time after being coated by the second coating glue solution 10 enters a drying part to be dried, and the automobile air filter paper with the moisture resistance is obtained; the total glue application was 21% of the oven dried basis weight of the finished filter paper.
The air filter paper prepared in example 2 of the present invention was subjected to the performance test according to the method of example 1, and the test result was that the air filter paper prepared in example 2 of the present invention was emptyThe performance indexes of the air filter paper are as follows: gram weight: 115.4g/m 2 (ii) a Thickness: 391 μm; air permeability of 148.1l/m 2 -s; maximum pore diameter: 40 μm; wet stiffness retention (JB/T12651.1-2016; 84.5 percent; elongation at Wet deformation: 0.53 percent.
Example 3
Preparation of primary coating glue solution:
weighing acrylic emulsion, MF crosslinking agent liquid and modified wax emulsion (modified polyethylene wax emulsion), respectively adding into a mixing tank with a stirring device, mixing with water for dilution, and fully stirring and mixing for later use; the mass concentration of the primary coating glue solution is 18%; wherein the mass ratio of the acrylic resin, the MF crosslinking agent and the LD-F01 modified wax emulsion is as follows: 89wt%:6wt%:5wt%; the following sequence and stirring time were used: water → acrylic acid emulsion (5 min) → MF crosslinking agent liquid (10 min) → modified wax emulsion, mixing, and stirring for another 20min for later use.
Preparation of secondary coating glue solution:
weighing acrylic emulsion, CMC, LD-F01 modified wax emulsion (modified polyethylene wax emulsion) and LD-K12 water-based organic silicon emulsion, respectively adding into a mixing tank with a stirring device, mixing with water, diluting, and stirring thoroughly; the mass concentration of the secondary coating glue solution is 6%; wherein the mass ratio of the acrylic emulsion to the CMC to the LD-F01 modified wax emulsion to the LD-K12 water-based organic silicon emulsion is as follows: 57wt%:8wt%:15wt%:20wt%; the following sequence and time were used: water → acrylic acid emulsion (5 min) → CMC carboxymethyl cellulose (10 min) → LD-F01 modified wax emulsion (10 min) → aqueous silicone emulsion, mixing, and stirring for 20 min.
The filter paper base paper was the same as in example 1.
Carrying out primary coating on the filter paper base paper, wherein roll-type coating is shown in figure 1, the filter paper base paper 1 enters between a coating rubber roll 2 and a coating steel roll 3 along the rotating advancing direction of the two rolls, and the coating steel roll 3 is a driving roll and drives the base paper 1 and the coating rubber roll 2 to run together; the primary coating glue solution 4 is injected into gaps 5 and 6 formed by the coating rubber roller 2 and the filter paper base paper 1 and the coating steel roller 3 and the filter paper base paper 1, and the filter paper base paper 1 is immersed into the primary coating glue solution 4 to obtain a double-sided dipping coating effect; the gap between the coating rubber roller 2 and the coating steel roller 3 and the pressure are adjusted during operation to control the extrusion of the base paper 1, so as to obtain the glue coating amount required by the process; the amount of glue applied was 18% of the oven dried basis weight of the finished filter paper.
The filter paper 7 after primary coating enters a drying part to be dried, and after the filter paper 7 enters a drying part to be coated for the second time, the spray coating is as shown in figure 2, when the paper web of the filter paper 7 after primary coating advances between a drying cylinder 8 and a drying cylinder 9, the glue solution 10 of secondary coating is atomized by a coating spray device 11 and then sprayed on the paper surface of the filter paper 7 after primary coating, and the coating surface is the windward surface of the filter paper where the air enters; when the secondary coating glue solution 10 is sprayed on the paper surface of the filter paper 7 after primary coating, the dryness of the paper web is 57 percent; during operation, the pressure of the secondary coating glue solution 10 entering the spray coating device 11 is adjusted to obtain the glue coating amount required by the process, wherein the glue coating amount is 6% of the absolute dry weight of the finished filter paper; the filter paper 12 coated with the secondary coating glue solution 10 for the second time enters a drying part to be dried, and the automobile air filter paper with the moisture resistance is obtained; the total glue application was 24% relative to the oven dried basis of the finished filter paper.
According to the method of the embodiment 1, the performance test of the air filter paper prepared in the embodiment 3 of the invention is performed, and the test result shows that the performance indexes of the air filter paper prepared in the embodiment 3 of the invention are as follows: gram weight: 120g/m 2 (ii) a Thickness: 407 μm; air permeability of 141.1l/m 2 -s; maximum pore diameter: 38.6 mu m; wet stiffness Retention (JB/T12651.1-2016: 86%; wet set elongation: 0.41 percent.
Performance detection
The air filter papers prepared in the examples of the invention were compared with commercially available products as shown in the following table:
compared with the existing automobile air filter paper in the market, the automobile air filter paper with the moisture resistance has the advantages that the moisture resistance (moisture resistance) and the wet deformation (dimensional deformation elongation) of the filter paper are remarkably improved by a secondary coating method under the condition that the performance indexes of the filter paper are the same, the stiffness retention rate is improved by 18-20%, and the dimensional deformation elongation is reduced by 42-54%.
The air filter paper provided by the invention has excellent moisture resistance, reduces the moisture absorption of the filter paper to a great extent, improves the dimensional deformation condition of the filter element of the filter, plays an important role in ensuring the safety and economy of vehicles in driving, and has positive significance in improving the pollution of automobile exhaust emission to the environment.
While the invention has been described and illustrated with reference to specific embodiments thereof, these descriptions and illustrations do not limit the invention. It will be clearly understood by those skilled in the art that various changes in form and details may be made therein without departing from the true spirit and scope of the invention as defined by the appended claims, to adapt a particular situation, material, composition of matter, substance, method or process to the objective, spirit and scope of this application. All such modifications are intended to be within the scope of the claims appended hereto. Although the methods disclosed herein have been described with reference to particular operations being performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form equivalent methods without departing from the teachings of the present disclosure. Accordingly, unless specifically indicated herein, the order and grouping of the operations is not a limitation of the present application.
Claims (7)
1. A preparation method of air filter paper comprises the following steps:
sequentially performing primary coating and secondary coating on the surface of the filter paper base paper and then drying to obtain air filter paper;
the primary coating glue solution is a primary coating glue solution;
the glue solution for secondary coating is a secondary coating glue solution;
the primary coating glue solution comprises: acrylic emulsion, cross-linking agent liquid and modified wax emulsion;
the mass ratio of the acrylic emulsion, the cross-linking agent liquid and the modified wax emulsion in the primary coating glue liquid is (89-93): (4-6): (3-5);
the secondary coating glue solution comprises: acrylic emulsion, carboxymethyl cellulose, modified wax emulsion and organosilicon emulsion;
the mass ratio of the acrylic emulsion, the carboxymethyl cellulose, the modified wax emulsion and the organic silicon emulsion in the secondary coating glue solution is (57-69): (5-8): (10-15): (16-20).
2. The method of claim 1, wherein the primary coating dope further comprises: water;
the total mass concentration of the acrylic emulsion, the cross-linking agent liquid and the modified wax emulsion in the primary coating glue solution is 16-18%.
3. The method according to claim 1, wherein the secondary coating glue solution further comprises: water;
the total mass concentration of the acrylic emulsion, the carboxymethyl cellulose, the modified wax emulsion and the organic silicon emulsion in the secondary coating glue solution is 4-6%.
4. The method according to claim 1, wherein the filter paper-based paper has a thickness of 400 to 420 μm; the air permeability is 190 to 200l/m 2 -s; the maximum aperture is 45-50 μm; the longitudinal wet strength is 4-5N/15 mm.
5. The method according to claim 1, wherein the one-time coating is roll coating and is double-sided coating.
6. The method of claim 1, wherein the secondary coating is a spray coating and is a single-sided coating.
7. The method of claim 1, wherein the web has a dryness of 55 to 60% during the secondary coating.
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| JP5971738B1 (en) * | 2015-03-20 | 2016-08-17 | 香川県 | Moisture permeable and water resistant sheet and method for producing the same |
| JP2019116536A (en) * | 2017-12-27 | 2019-07-18 | ユニチカ株式会社 | Aqueous coat agent |
| CN112726287A (en) * | 2020-12-29 | 2021-04-30 | 山东龙德复合材料科技股份有限公司 | High-temperature-resistant flame-retardant glue solution and preparation method of automobile air filter paper using same |
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| US6117563A (en) * | 1995-10-18 | 2000-09-12 | Nippon Paper Industries Co., Ltd. | Moistureproof paper having shading property and recyclability |
| JP2004017041A (en) * | 2002-06-19 | 2004-01-22 | Oshidari Kenkyusho:Kk | Filter medium for high performance air filter and high performance air filter using filter medium |
| JP2004154672A (en) * | 2002-11-06 | 2004-06-03 | Hokuetsu Paper Mills Ltd | Filter medium for air filter and its manufacturing method |
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| JP2016097336A (en) * | 2014-11-19 | 2016-05-30 | 日揮ユニバーサル株式会社 | Filter medium for air filter and manufacturing method of the same |
| JP5971738B1 (en) * | 2015-03-20 | 2016-08-17 | 香川県 | Moisture permeable and water resistant sheet and method for producing the same |
| JP2019116536A (en) * | 2017-12-27 | 2019-07-18 | ユニチカ株式会社 | Aqueous coat agent |
| CN112726287A (en) * | 2020-12-29 | 2021-04-30 | 山东龙德复合材料科技股份有限公司 | High-temperature-resistant flame-retardant glue solution and preparation method of automobile air filter paper using same |
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