CN114687249A - Thermosetting filter paper for internal combustion engine and preparation method thereof - Google Patents
Thermosetting filter paper for internal combustion engine and preparation method thereof Download PDFInfo
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- CN114687249A CN114687249A CN202210396699.2A CN202210396699A CN114687249A CN 114687249 A CN114687249 A CN 114687249A CN 202210396699 A CN202210396699 A CN 202210396699A CN 114687249 A CN114687249 A CN 114687249A
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- fiber
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- filter paper
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 78
- 229920001187 thermosetting polymer Polymers 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 224
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims abstract description 64
- 238000001035 drying Methods 0.000 claims abstract description 37
- 238000007731 hot pressing Methods 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 238000004537 pulping Methods 0.000 claims abstract description 15
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 9
- 239000004760 aramid Substances 0.000 claims abstract description 9
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 8
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- 238000002791 soaking Methods 0.000 claims description 29
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- 239000003795 chemical substances by application Substances 0.000 claims description 23
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- 239000011122 softwood Substances 0.000 claims description 17
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 16
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 11
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- FWVCSXWHVOOTFJ-UHFFFAOYSA-N 1-(2-chloroethylsulfanyl)-2-[2-(2-chloroethylsulfanyl)ethoxy]ethane Chemical compound ClCCSCCOCCSCCCl FWVCSXWHVOOTFJ-UHFFFAOYSA-N 0.000 claims description 3
- XGDRLCRGKUCBQL-UHFFFAOYSA-N 1h-imidazole-4,5-dicarbonitrile Chemical compound N#CC=1N=CNC=1C#N XGDRLCRGKUCBQL-UHFFFAOYSA-N 0.000 claims description 3
- 229920002488 Hemicellulose Polymers 0.000 claims description 3
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 claims description 3
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- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 3
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- 238000004140 cleaning Methods 0.000 claims description 3
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- 239000013530 defoamer Substances 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
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- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
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- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
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- 229940051841 polyoxyethylene ether Drugs 0.000 description 10
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
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- 231100000719 pollutant Toxicity 0.000 description 4
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- CDOUZKKFHVEKRI-UHFFFAOYSA-N 3-bromo-n-[(prop-2-enoylamino)methyl]propanamide Chemical compound BrCCC(=O)NCNC(=O)C=C CDOUZKKFHVEKRI-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
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- 230000009172 bursting Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
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- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 239000002923 metal particle Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
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- 239000010705 motor oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 238000001878 scanning electron micrograph Methods 0.000 description 1
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- 229920002994 synthetic fiber Polymers 0.000 description 1
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Images
Classifications
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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
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
- D21H13/10—Organic non-cellulose fibres
- D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
-
- 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
- D21H13/10—Organic non-cellulose fibres
- D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/16—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
-
- 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
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
-
- 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
- D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
- D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
- D21H17/45—Nitrogen-containing groups
-
- 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
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/48—Condensation polymers of aldehydes or ketones with phenols
-
- 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
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/53—Polyethers; Polyesters
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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
- D21H21/06—Paper forming aids
- D21H21/08—Dispersing agents for fibres
Abstract
The invention discloses thermosetting filter paper for an internal combustion engine and a preparation method thereof, and belongs to the technical field of papermaking. The thermosetting internal combustion engine filter paper is prepared by wet papermaking of high-strength and high-modulus polyethylene fibers, plant fibers, aramid pulp and polyvinyl alcohol fibers; wherein the mass ratio of each fiber component is as follows: 30-100% of high-strength high-modulus polyethylene fiber, 0-50% of plant fiber, 5-20% of aramid pulp and 1-5% of polyvinyl alcohol fiber. The preparation process of the thermosetting filter paper for the internal combustion engine is as follows: (1) determining the proportion of fiber raw materials, (2) pulping plant fibers, (3) pretreating, (4) defibering the raw materials, (5) adding auxiliaries, (6) forming and drying paper sheets, (7) impregnating resin, and (8) hot-pressing and curing. The thermosetting filter paper for the internal combustion engine prepared by the preparation method has good hydrophobicity, excellent corrosion resistance, uniform pore diameter and excellent mechanical strength.
Description
Technical Field
The invention relates to thermosetting filter paper for an internal combustion engine and a preparation method thereof, belonging to the technical field of pulping and papermaking.
Background
The filter paper of the internal combustion engine is a key material of an engine filtering system, can filter dust, metal particles and carbon deposition in fuel oil, ensures the cleanness of the fuel oil, further can reduce the abrasion among mechanical parts of the engine, cleans the engine and prolongs the service life of the engine. The filter paper for the internal combustion engine is the filter paper which has high stiffness and strength after the base paper of the filter paper is impregnated by phenolic resin and is subjected to thermosetting treatment and can bear a certain pressure difference. The requirement on the performance of the filter paper of the internal combustion engine is continuously improved along with the continuous development of the engine technology, particularly the requirement on the number of mileage of the filter of the internal combustion engine is continuously increased along with the continuous increase of the requirement on the replacement of the filter, the requirement on the pollutant carrying capacity of the filter paper of the internal combustion engine is continuously improved, and the requirement on the particle size of the filtered pollutants is also continuously improved.
However, the conventional filter paper for internal combustion engine is usually a paper filter layer made of common wood pulp as a main component, and has the following disadvantages: on one hand, the prepared internal combustion engine filter paper has high tightness, poor hydrophobicity, poor strength and poor temperature resistance because the common wood pulp fiber is thin and high in tightness and is easy to absorb water, swell and age; on the other hand, the fiber component is single, the relationship between the filtering efficiency and the pollutant holding capacity cannot be coordinated, and the pollutant holding capacity is difficult to improve on the premise of ensuring the filtering precision. And further cannot meet the requirement of long-time working of the oil filter. Therefore, the invention of the thermosetting internal combustion engine filter paper with good water repellency, excellent solvent resistance, excellent low temperature resistance, uniform pore diameter and larger mechanical strength has great research significance.
At present, the internal combustion engine filter paper with different performance advantages is prepared by mostly adjusting the proportion between plant fibers and other fibers. The high-strength high-modulus polyethylene fiber belongs to synthetic fiber, has the characteristics of smooth surface, high strength, small density compared with water, excellent low-temperature resistance and the like, and the paper base prepared by the wet forming technology has good hydrophobicity, light weight, uniform pore diameter and high strength. Therefore, the preparation of the filter paper for the internal combustion engine by mixing the high-strength and high-modulus polyethylene fibers, the softwood pulp fibers and other fibers has great research significance.
Disclosure of Invention
The invention provides the following technical scheme:
in order to solve the technical problems, the invention provides a two-dimensional paper base material constructed by high-strength and high-modulus polyethylene fibers and plant fibers which are not hydrophilic, have high strength, are resistant to low temperature and acid-base corrosion and solvents, and a wet papermaking technology is adopted to prepare thermosetting filter paper for an internal combustion engine.
High-strength High-modulus Polyethylene Fiber (UHMWPEF) is also called Ultra-High Molecular Weight Polyethylene Fiber, is the Fiber with the highest specific strength and specific modulus at present, and is the Fiber spun by Polyethylene with the Molecular Weight of 100-500 ten thousand; the high-strength high-modulus polyethylene fiber belongs to polyolefin fiber, has the performance characteristics of the polyolefin fiber, and has higher melting point.
Because 100% high-strength high-modulus polyethylene fiber is difficult to make low-quantitative paper base material with paper, and the strength is low, the invention uses wood pulp and high-strength high-modulus polyethylene fiber to make paper with a certain proportion, which can solve the problem of difficult paper making, and the wood pulp fiber after pulping has many chemical bonds, can be mutually interlaced with the high-strength high-modulus polyethylene fiber without chemical bonds, and enhances the strength of the paper base; furthermore, the filter paper prepared from 100% pure wood pulp fiber has the problems of easy water absorption, swelling, easy aging, high tightness and the like, and once other chemical fibers are added, the problems can be improved because the chemical fibers have the characteristics of poor moisture absorption, smooth fiber surface, good solvent resistance and the like.
According to the preparation method disclosed by the invention, on one hand, the problems of low papermaking strength and difficulty in processing of the high-strength high-modulus polyethylene fiber can be solved; on the other hand, the problems that common wood pulp is easy to absorb water, wet and expand, easy to age, high in tightness and the like can be solved, and the water resistance, the corrosion resistance and the mechanical property of the filter paper of the internal combustion engine are effectively improved; and can widen the application range of the high-strength high-modulus polyethylene fiber composite material.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention firstly provides a preparation method of thermosetting filter paper for an internal combustion engine, which comprises the following steps:
step one, determining the proportion of fiber raw materials: according to the mass percentage, 30-100% of high-strength high-modulus polyethylene fiber, 10-70% of plant fiber, 5-20% of aramid pulp and 1-5% of polyvinyl alcohol fiber are taken for standby;
step two, pulping the plant fibers: placing the vegetable fiber oven-dried pulp into a beating machine, adding water to discongest for 20min-30min, beating with a light knife for 40min-60min, stopping beating until the fiber is completely dispersed and has no pulp point, and obtaining vegetable fiber pulp; and throwing out the water in the slurry, and balancing the water for later use;
step three, pretreatment: pretreating the high-strength high-modulus polyethylene fiber;
step four, fluffing the raw materials: mixing the fiber raw materials taken according to the proportion in the step one, wherein the plant fiber is the pulped plant fiber in the step two, and the high-strength high-modulus polyethylene fiber is the high-strength high-modulus polyethylene fiber pretreated in the step three; then defibering by a defibering machine;
step five, adding an auxiliary agent: taking 0-6% of dispersant and 0-10% of reinforcing agent according to the mass ratio of the absolutely dry fiber; adding the dispersant and the reinforcing agent into the slurry after the defibering in the fourth step, and stirring and dispersing the mixture uniformly in sequence to obtain slurry;
step six, forming and drying paper sheets: d, performing net-surfing papermaking, squeezing dehydration and drying on the pulp obtained in the step five to obtain the internal combustion engine filter paper base paper;
step seven, impregnating resin: soaking the internal combustion engine filter paper base paper obtained in the sixth step in a thermosetting phenolic resin solution, taking out after soaking for a period of time, and then placing in a low-temperature oven for drying to obtain uncured internal combustion engine filter paper;
step eight, hot-pressing and curing: and (4) carrying out hot pressing and curing on the uncured internal combustion engine filter paper obtained in the step seven through a hot press to obtain the thermosetting internal combustion engine filter paper.
According to the technical scheme of the invention, the quality of the oven-dried fiber refers to the quality of the fiber after moisture is removed; for example, if 3g of absolutely dry wood pulp fibres are taken, but the water content of the wood pulp fibres is 78%, then the mass of the wood pulp taken at this time is 3 ÷ (100-78) ═ 13.64 g. Thus, the amount of the auxiliary agent added is calculated as the mass of the oven dried fiber.
In one embodiment, in the first step, the plant fiber is bleached softwood fiber produced by a chemical, semi-chemical or chemimechanical process; in the second step, the beating degree of the plant fiber slurry is 10-40 DEG SR.
In one embodiment, the length of the high-strength high-modulus polyethylene fiber in the first step is 2mm to 6mm, and the titer is 0.1dtex to 0.2 dtex; the length of the plant fiber is 2mm-4mm, and the diameter is 2 μm-8 μm.
In one embodiment, in the third step, the step of preprocessing is as follows:
step a, decontamination: washing and decontaminating the high-strength high-modulus polyethylene fiber by using an organic solvent, cleaning the high-strength high-modulus polyethylene fiber by using deionized water, and drying the high-strength high-modulus polyethylene fiber for later use;
step b, soaking: taking 0.01-8% of penetrating agent by mass ratio based on the mass of absolute dry fiber; soaking the standby fiber obtained in the step a in water, and adding the taken penetrating agent to soak the fiber for 6-24 hours;
step c, dispersing: taking 0.01-8% of defoaming agent by mass ratio based on the absolute dry fiber mass; and c, adding the taken defoaming agent into the mixed solution obtained in the step b, and then defibering the fibers by using a fiber defibering device to perform mechanical dispersion.
In one embodiment, in the step b, the penetrating agent is one or more of a penetrating agent JFC (fatty alcohol-polyoxyethylene ether), a penetrating agent JFC-2 (a mixture of fatty alcohol and ethylene oxide), a penetrating agent JFC-M (mainly polyoxyethylene ether), a super-strong penetrating agent JFC-E (fatty alcohol-polyoxyethylene ether), a low-foaming penetrating agent SF (fatty alcohol-polyoxyalkyl ether), or a rapid penetrating agent T (dioctyl sodium sulfosuccinate).
In one embodiment, in step c, the defoamer comprises one or more of a silicone compound, a condensate of a fatty alcohol and ethylene oxide propylene oxide, or propylene glycol polyoxypropylene ether or glycerol polyoxypropylene ether.
In one embodiment, in the fifth step, the dispersant is one or more of polyethylene oxide, sodium dodecyl benzene sulfonate, sodium carboxymethyl cellulose, MOA-15 (fatty alcohol polyoxyethylene ether), MOA-7 (fatty alcohol polyoxyethylene ether), methyl cellulose, octadecyl amine, sodium hexamethaphosphate or sodium pyrophosphate;
the reinforcing agent is one or more of cationic polyacrylamide, anionic polyacrylamide, amphoteric starch, cationic starch, anionic starch, nonionic starch, cellulose or hemicellulose.
In one embodiment, the pressing pressure in the sixth step is 0.1MPa to 4MPa, and the drying temperature is 100 ℃ to 130 ℃.
In one embodiment, the concentration of the thermosetting phenolic resin solution in the seventh step is 1-30%, the sizing amount of the paper sheet is 15-25%, the drying temperature is 40-60 ℃, and the drying time is 10-30 min.
In one embodiment, the hot pressing conditions in the step eight are: the temperature is 100-150 ℃, the pressure is 0.1-30 MPa, and the time is 5-60 min.
The invention also provides thermosetting internal combustion engine filter paper which is prepared by the preparation method.
In one embodiment, the thermosetting internal combustion engine filter paper has a basis weight of 120g/m2-160g/m2。
In one embodiment, the thermoset internal combustion engine filter paper has a thickness of 0.3mm to 0.5 mm.
In one embodiment, the thermoset internal combustion engine filter paper has an air permeability of 10mm/s to 100mm/s and an average pore size in the range of 50 μm to 100 μm.
In one embodiment of the invention, the thermosetting internal combustion engine filter paper has a burst strength in a range of 300kPa to 500 kPa.
Has the advantages that:
(1) according to the technical scheme of the invention, the high-strength high-modulus polyethylene fiber and the plant fiber which are not hydrophilic, have high strength, are resistant to low temperature and acid and alkali corrosion and are solvent are adopted to construct the two-dimensional paper base material according to a certain proportion, wherein the plant fiber is softwood fiber, so that the bulk of the finished paper is large, and the air permeability is high; and the high-strength high-modulus polyethylene fiber has the characteristics of smooth surface, small density compared with water, good low-temperature resistance, high strength and the like, so that the paper has good hydrophobicity, light weight and good air permeability.
(2) According to the technical scheme of the invention, when the high-strength high-modulus polyethylene fiber paper base material with the proportion of 100% is manufactured, the problems of difficult forming, low strength of the paper base material and the like can occur; therefore, the preparation method of the invention can solve the problems of difficult paper forming and low strength by mixing the high-strength and high-modulus polyethylene fiber and the wood pulp fiber with a certain beating degree for papermaking.
(3) According to the technical scheme of the invention, the prepared thermosetting internal combustion engine filter paper has the characteristics of poor hygroscopicity, smooth fiber surface, good solvent resistance and the like due to the added high-strength high-modulus polyethylene fiber, so that the problems of poor water resistance, poor oil resistance, low bursting strength, short service life, poor weather resistance and the like of the internal combustion engine filter paper prepared from common wood pulp are solved.
(4) According to the technical scheme of the invention, the preparation method uses a simple and mature wet papermaking technology, and the prepared internal combustion engine filter paper has high bursting strength, good chemical corrosion resistance and long service life by adjusting the proportion of chemical fibers and plant fibers.
(5) According to the technical scheme of the invention, the thermosetting filter paper for the internal combustion engine is prepared from the high-strength high-modulus polyethylene fiber, the plant fiber and other fibers which are resistant to acid and alkali corrosion, high in strength and hydrophobic, so that the application range of the high-strength high-modulus polyethylene fiber composite material is further expanded.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a photograph of an internal combustion engine filter paper prepared according to the method of example two, before curing;
FIG. 2 is a cured photograph of an internal combustion engine filter paper prepared according to the method described in example two;
FIG. 3 is an SEM image at 200 times magnification after curing of the filter paper for an internal combustion engine prepared according to the method described in example II;
FIG. 4 is a photograph of the contact angle after curing of the filter paper for an internal combustion engine prepared according to the method described in example two.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment provides a preparation method of thermosetting filter paper for an internal combustion engine, which comprises the following steps:
step one, determining the proportion of fiber raw materials: according to the mass percentage, 30-100% of high-strength high-modulus polyethylene fiber, 10-70% of plant fiber, 5-20% of aramid pulp and 1-5% of polyvinyl alcohol fiber are taken for standby;
step two, pulping the plant fibers: placing the vegetable fiber oven-dried pulp into a beating machine, adding water to discongest for 20min-30min, beating with a light knife for 40min-60min, stopping beating until the fiber is completely dispersed and has no pulp point, and obtaining vegetable fiber pulp; and throwing out the water in the slurry, and balancing the water for later use;
step three, pretreatment: pretreating the high-strength high-modulus polyethylene fiber;
step four, fluffing the raw materials: mixing the fiber raw materials taken according to the proportion in the step one, wherein the plant fiber is the pulped plant fiber in the step two, and the high-strength high-modulus polyethylene fiber is the high-strength high-modulus polyethylene fiber pretreated in the step three; then defibering by a defibering machine;
step five, adding an auxiliary agent: taking 0-6% of dispersant and 0-10% of reinforcing agent according to the mass ratio of the absolutely dry fiber; adding the dispersant and the reinforcing agent into the slurry after the defibering in the fourth step, and stirring and dispersing the mixture uniformly in sequence to obtain slurry;
step six, forming and drying paper sheets: d, performing net-surfing papermaking, squeezing dehydration and drying on the pulp obtained in the step five to obtain the internal combustion engine filter paper base paper;
step seven, impregnating resin: soaking the internal combustion engine filter paper base paper obtained in the sixth step in a thermosetting phenolic resin solution, taking out after soaking for a period of time, and then placing in a low-temperature oven for drying to obtain uncured internal combustion engine filter paper;
step eight, hot-pressing and curing: and (4) carrying out hot pressing and curing on the uncured internal combustion engine filter paper obtained in the step seven through a hot press to obtain the thermosetting internal combustion engine filter paper.
According to the technical scheme of the invention, the quality of the oven-dried fiber refers to the quality of the fiber after moisture is removed; for example, if 3g of absolutely dry wood pulp fibres are taken, but the water content of the wood pulp fibres is 78%, then the mass of the wood pulp taken at this time is 3 ÷ (100-78) ═ 13.64 g. Thus, the amount of the auxiliary agent added is calculated as the mass of the oven dried fiber.
According to the embodiment, in the second step, the quality of the wood pulp is not directly related to the fiber ratio during pulping, and because the pulping apparatus has the minimum pulping pulp quality requirement, in one embodiment, for example, 180g of vegetable fiber absolute dry pulp is taken for pulping, and 180g of pulp is taken according to the ratio in the first step after pulping; in addition, in order to ensure that the beating degree of the pulp used in the later period is uniform and the shape of the beaten wood pulp is the same, the preparation method can adopt one-time beating, and the paper is directly taken after beating.
In one embodiment, in the first step, the plant fiber is bleached softwood fiber produced by a chemical, semi-chemical or chemimechanical process; in the second step, the beating degree of the plant fiber slurry is 10-40 DEG SR.
In one embodiment, the length of the high-strength high-modulus polyethylene fiber in the first step is 2mm to 6mm, and the titer is 0.1dtex to 0.2 dtex; the length of the plant fiber is 2mm-4mm, and the diameter is 2 μm-8 μm.
In one embodiment, in the third step, the step of preprocessing is as follows:
step a, decontamination: washing and decontaminating the high-strength high-modulus polyethylene fiber by using an organic solvent, cleaning the high-strength high-modulus polyethylene fiber by using deionized water, and drying the high-strength high-modulus polyethylene fiber for later use;
step b, soaking: taking 0.01-8% of penetrant by mass of absolutely dry fibers; soaking the standby fiber obtained in the step a in water, adding the obtained penetrating agent to soak the fiber, wherein the soaking time is 6-24 hours;
step c, dispersing: taking 0.01-8% of defoaming agent by mass ratio based on the absolute dry fiber mass; and c, adding the taken defoaming agent into the mixed solution obtained in the step b, and then defibering the fibers by using a fiber defibering device to perform mechanical dispersion.
In one embodiment, in the step b, the penetrating agent is one or more of a penetrating agent JFC (fatty alcohol-polyoxyethylene ether), a penetrating agent JFC-2 (a mixture of fatty alcohol and ethylene oxide), a penetrating agent JFC-M (mainly polyoxyethylene ether), a super-strong penetrating agent JFC-E (fatty alcohol-polyoxyethylene ether), a low-foaming penetrating agent SF (fatty alcohol-polyoxyalkyl ether), or a rapid penetrating agent T (dioctyl sodium sulfosuccinate).
In one embodiment, in step c, the defoamer comprises one or more of a silicone compound, a condensate of a fatty alcohol and ethylene oxide propylene oxide, or propylene glycol polyoxypropylene ether or glycerol polyoxypropylene ether.
In one embodiment, in the fifth step, the dispersant is one or more of polyethylene oxide, sodium dodecyl benzene sulfonate, sodium carboxymethyl cellulose, MOA-15 (fatty alcohol polyoxyethylene ether), MOA-7 (fatty alcohol polyoxyethylene ether), methyl cellulose, octadecyl amine, sodium hexamethaphosphate or sodium pyrophosphate;
the reinforcing agent is one or more of cationic polyacrylamide, anionic polyacrylamide, amphoteric starch, cationic starch, anionic starch, nonionic starch, cellulose or hemicellulose.
In one embodiment, the pressing pressure in the sixth step is 0.1MPa to 4MPa, and the drying temperature is 100 ℃ to 130 ℃.
In one embodiment, the concentration of the thermosetting phenolic resin solution in the seventh step is 1-30%, the sizing amount of the paper sheet is 15-25%, the drying temperature is 40-60 ℃, and the drying time is 10-30 min.
In one embodiment, the hot pressing conditions in the step eight are: the temperature is 100-150 ℃, the pressure is 0.1-30 MPa, and the time is 5-60 min.
The embodiment also provides the thermosetting internal combustion engine filter paper which is prepared by adopting the preparation method.
In one embodiment, the thermosetting internal combustion engine filter paper has a basis weight of 120g/m2-160g/m2。
In one embodiment, the thermoset internal combustion engine filter paper has a thickness of 0.3mm to 0.5 mm.
In one embodiment, the thermoset internal combustion engine filter paper has an air permeability of 10mm/s to 100mm/s and an average pore size in the range of 50 μm to 100 μm.
In one embodiment, the thermoset internal combustion engine filter paper has a burst strength in a range from 300kPa to 500 kPa.
Example two
The embodiment provides a preparation method of thermosetting filter paper for an internal combustion engine, which comprises the following specific steps:
(1) pulping the plant fibers: the plant fiber is softwood pulp fiber, and the beating degree is 22 DEG SR;
(2) determining the fiber raw material ratio: selecting high-strength high-modulus polyethylene fibers with the length of 6mm, wherein the high-strength high-modulus polyethylene fibers comprise 75% of high-strength high-modulus polyethylene fibers, 18% of softwood pulp, 5% of aramid pulp and 2% of polyvinyl alcohol fibers in percentage by mass for later use;
(3) pretreatment: washing high-strength high-modulus polyethylene fibers with ethanol, washing with deionized water, and setting the quantitative of the lithium ion battery diaphragm paper to be 135g/m2Soaking the cleaned fiber in water, adjusting the fiber concentration to 0.78 per mill, adding a low-foaming penetrant SF with the absolute dry fiber mass of 0.08% to soak for 12h, then adding a defoaming agent with the absolute dry fiber mass of 0.1% to directly place the fiber in a fiber dissociator to dissociate for 10 min;
(4) fluffing of raw materials: mixing the weighed softwood pulp fibers with the pretreated high-strength high-modulus polyethylene fibers, and then defibering by using a defibering machine;
(5) addition of an auxiliary agent: respectively adding 0.1% of cationic polyacrylamide and 0.1% of dispersant polyethylene oxide in terms of absolute dry fiber mass into the defibered fiber slurry, and respectively stirring for 60s after each auxiliary agent is added to uniformly disperse the fiber slurry;
(6) forming and drying paper sheets: directly making pulp on a net, squeezing and dehydrating under the pressure of 4MPa, and drying at 120 ℃ for 15 min;
(7) resin impregnation: soaking the base paper obtained in the sixth step in a thermosetting phenolic resin solution with the concentration of 6%, taking out the base paper after soaking for 30s, and then placing the base paper in a 50 ℃ blast drying oven for drying to obtain uncured internal combustion engine filter paper;
(8) hot-pressing and curing: and (5) carrying out hot-pressing solidification on the uncured internal combustion engine filter paper obtained in the step seven through a hot press, wherein the hot-pressing pressure is 5MPa, the temperature is 130 ℃, and the hot-pressing time is 15min, so that the thermosetting internal combustion engine filter paper is obtained. The sizing amount of the prepared filter paper is 20%.
FIG. 1 is a photograph of an internal combustion engine filter paper prepared according to the method of the present example, before curing; FIG. 2 is a photograph of an internal combustion engine filter paper prepared according to the method of the present example after curing; FIG. 3 is an electron microscope image at 200 times magnification after curing of the filter paper for an internal combustion engine prepared according to the method of the present embodiment; fig. 4 is a picture of the contact angle after curing of the filter paper for an internal combustion engine prepared according to the method of the present example.
(9) The basic properties of the filter paper are shown in Table 1.
EXAMPLE III
The embodiment provides a preparation method of thermosetting filter paper for an internal combustion engine, which comprises the following specific steps:
(1) pulping the plant fibers: the beating degree of the softwood pulp fibers is 25 DEG SR;
(2) determining the fiber raw material ratio: selecting high-strength high-modulus polyethylene fibers with the length of 6mm, and calculating according to the mass percentage, wherein 74% of the high-strength high-modulus polyethylene fibers, 17% of softwood pulp, 6% of aramid pulp and 3% of polyvinyl alcohol fibers are reserved;
(3) pretreatment: washing high-strength high-modulus polyethylene fibers with ethanol, washing with deionized water, and setting the quantitative of the lithium ion battery diaphragm paper to be 135g/m2Soaking the cleaned fiber in water, adjusting the fiber concentration to 0.78 per mill, adding a low-foaming penetrant SF accounting for 0.05 percent of the mass of the absolutely dry fiber, soaking for 12 hours, adding a defoaming agent accounting for 0.12 percent of the mass of the absolutely dry fiber, and directly placing the fiber in a fiber dissociator for defibering, wherein the defibering time is 10 min;
(4) fluffing of raw materials: mixing the weighed softwood pulp fibers with the pretreated high-strength high-modulus polyethylene fibers, and then fluffing by using a fluffer;
(5) addition of an auxiliary agent: respectively adding 0.15 percent of cationic polyacrylamide and 0.08 percent of dispersant polyethylene oxide in absolute dry fiber mass into the defibered fiber slurry, and respectively stirring for 60s after each auxiliary agent is added to uniformly disperse the fiber slurry;
(6) forming and drying paper sheets: directly making pulp on a net, squeezing and dehydrating under the pressure of 4MPa, and drying at 120 ℃ for 15 min;
(7) step seven, impregnating resin: soaking the base paper obtained in the sixth step in a thermosetting phenolic resin solution with the concentration of 8%, taking out the base paper after soaking for 20s, and then placing the base paper in a 50 ℃ blast drying oven for drying to obtain uncured internal combustion engine filter paper;
(8) step eight, hot-pressing and curing: and (5) carrying out hot pressing solidification on the uncured internal combustion engine filter paper obtained in the step seven through a hot pressing machine, wherein the hot pressing pressure is 0MPa, the temperature is 0 ℃, and the hot pressing time is 0min, so that the thermosetting internal combustion engine filter paper is obtained. The sizing amount of the prepared filter paper is 22 percent.
(9) The basic properties of the filter paper are shown in Table 1.
Example four
The embodiment provides a preparation method of thermosetting filter paper for an internal combustion engine, which comprises the following specific steps:
(1) pulping the plant fibers: the beating degree of the softwood pulp fibers is 28 DEG SR;
(2) determining the fiber raw material ratio: selecting high-strength high-modulus polyethylene fibers with the length of 6mm, and calculating according to the mass percentage, wherein 65% of the high-strength high-modulus polyethylene fibers, 25% of softwood pulp, 8% of aramid pulp and 2% of polyvinyl alcohol fibers are reserved;
(3) pretreatment: washing high-strength high-modulus polyethylene fibers with ethanol, washing with deionized water, and setting the quantitative of the lithium ion battery diaphragm paper to be 135g/m2Soaking the cleaned fiber in water, adjusting the fiber concentration to 0.78 per mill, adding a low-foaming penetrant SF accounting for 0.05 percent of the mass of the absolutely dry fiber, soaking for 12 hours, adding a defoaming agent accounting for 0.1 percent of the mass of the absolutely dry fiber, and directly placing the fiber in a fiber dissociator for defibering, wherein the defibering time is 10 min;
(4) fluffing of raw materials: mixing the weighed softwood pulp fibers with the pretreated high-strength high-modulus polyethylene fibers, and then defibering by using a defibering machine;
(5) addition of an auxiliary agent: respectively adding 0.15 percent of cationic polyacrylamide and 0.2 percent of dispersant polyethylene oxide in absolute dry fiber mass into the defibered fiber slurry, and respectively stirring for 60s after each auxiliary agent is added to uniformly disperse the fiber slurry;
(6) forming and drying paper sheets: directly making pulp on a net, squeezing and dehydrating under the pressure of 4MPa, and drying at 120 ℃ for 15 min;
(7) step seven, impregnating resin: soaking the base paper obtained in the sixth step in a thermosetting phenolic resin solution with the concentration of 6%, taking out the base paper after soaking for 30s, and then placing the base paper in a 50 ℃ blast drying oven for drying to obtain uncured internal combustion engine filter paper;
(8) step eight, hot-pressing and curing: and (5) carrying out hot-pressing solidification on the uncured internal combustion engine filter paper obtained in the step seven through a hot press, wherein the hot-pressing pressure is 8MPa, the temperature is 130 ℃, and the hot-pressing time is 10min, so that the thermosetting internal combustion engine filter paper is obtained. The sizing amount of the prepared filter paper is 18 percent.
(9) The basic properties of the filter paper are shown in Table 1.
EXAMPLE five
The embodiment provides a preparation method of thermosetting filter paper for an internal combustion engine, which comprises the following specific steps:
(1) pulping the plant fibers: the beating degree of the softwood pulp fibers is 30 DEG SR;
(2) determining the fiber raw material ratio: selecting high-strength high-modulus polyethylene fibers with the length of 6mm, and calculating according to the mass percentage, wherein the high-strength high-modulus polyethylene fibers comprise 70% of high-strength high-modulus polyethylene fibers, 20% of softwood pulp, 5% of aramid pulp and 5% of polyvinyl alcohol fibers for later use;
(3) pretreatment: washing high-strength high-modulus polyethylene fibers with ethanol, washing with deionized water, and setting the quantitative of the lithium ion battery diaphragm paper to be 135g/m2Soaking the cleaned fiber in water, adjusting the fiber concentration to 0.78 per mill, adding a low-foaming penetrant SF accounting for 0.05 percent of the mass of the absolutely dry fiber, soaking for 12 hours, adding a defoaming agent accounting for 0.1 percent of the mass of the absolutely dry fiber, and directly placing the fiber in a fiber dissociator for defibering, wherein the defibering time is 10 min;
(4) fluffing of raw materials: mixing the weighed softwood pulp fibers with the pretreated high-strength high-modulus polyethylene fibers, and then defibering by using a defibering machine;
(5) addition of an auxiliary agent: respectively adding 0.1% of cationic polyacrylamide and 0.1% of dispersant polyethylene oxide in terms of absolute dry fiber mass into the defibered fiber slurry, and respectively stirring for 60s after each auxiliary agent is added to uniformly disperse the fiber slurry;
(6) forming and drying paper sheets: directly making pulp on a net, squeezing and dehydrating under the pressure of 4MPa, and drying at 120 ℃ for 15 min;
(7) step seven, impregnating resin: soaking the base paper obtained in the sixth step in a thermosetting phenolic resin solution with the concentration of 10%, taking out the base paper after soaking for 10s, and then placing the base paper in a 50 ℃ forced air drying oven for drying to obtain uncured internal combustion engine filter paper;
(8) step eight, hot-pressing and curing: and (5) carrying out hot-pressing solidification on the uncured internal combustion engine filter paper obtained in the step seven through a hot press, wherein the hot-pressing pressure is 10MPa, the temperature is 130 ℃, and the hot-pressing time is 20min, so that the thermosetting internal combustion engine filter paper is obtained. The sizing amount of the prepared filter paper is 25 percent.
(9) The basic properties of the thermosetting engine oil filter paper are shown in Table 1.
TABLE 1
According to the embodiments, the internal combustion engine filter paper prepared by the preparation method disclosed by the invention can overcome the problems of low strength and difficulty in processing of high-strength and high-modulus polyethylene fibers; on the other hand, the problems that common wood pulp is easy to absorb water, wet and expand, easy to age, high in tightness and the like can be solved, the water resistance, corrosion resistance and mechanical property of the filter paper of the internal combustion engine are effectively improved, and the application range of the high-strength high-modulus polyethylene fiber composite material is widened.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of making a thermoset internal combustion engine filter paper, comprising:
step one, determining the proportion of fiber raw materials: according to the mass percentage, 30-100% of high-strength high-modulus polyethylene fiber, 10-70% of plant fiber, 5-20% of aramid pulp and 1-5% of polyvinyl alcohol fiber are taken;
step two, pulping the plant fibers: placing the vegetable fiber oven-dried pulp into a beating machine, adding water to discongest for 20min-30min, beating with a light knife for 40min-60min, stopping beating until the fiber is completely dispersed and has no pulp point, and obtaining vegetable fiber pulp; and throwing out the water in the slurry, and balancing the water for later use;
step three, pretreatment: pretreating the high-strength high-modulus polyethylene fiber;
step four, fluffing the raw materials: mixing the fiber raw materials taken according to the proportion in the step one, wherein the plant fiber is the plant fiber pulped in the step two, and the high-strength high-modulus polyethylene fiber is the high-strength high-modulus polyethylene fiber pretreated in the step three, and then defibering by using a defibering machine;
step five, adding an auxiliary agent: taking 0-6% of dispersant and 0-10% of reinforcing agent according to the mass ratio of the absolutely dry fiber; adding the dispersant and the reinforcing agent into the slurry after the defibering in the fourth step, and stirring and dispersing the mixture uniformly in sequence to obtain slurry;
step six, forming and drying paper sheets: d, performing net-surfing papermaking, squeezing dehydration and drying on the pulp obtained in the step five to obtain the internal combustion engine filter paper base paper;
step seven, impregnating resin: soaking the internal combustion engine filter paper base paper obtained in the sixth step in a thermosetting phenolic resin solution, taking out after soaking for a period of time, and then placing in a low-temperature oven for drying to obtain uncured internal combustion engine filter paper;
step eight, hot-pressing and curing: and (4) carrying out hot pressing and curing on the uncured internal combustion engine filter paper obtained in the step seven through a hot press to obtain the thermosetting internal combustion engine filter paper.
2. The method according to claim 1, wherein in the first step, the plant fiber is bleached softwood fiber produced by a chemical, semi-chemical or chemi-mechanical process; in the second step, the beating degree of the plant fiber slurry is 10-40 DEG SR.
3. The method according to claim 1, wherein the high-strength high-modulus polyethylene fiber in the first step has a length of 2mm to 6mm and a fineness of 0.1dtex to 0.2 dtex; the length of the plant fiber is 2mm-4mm, and the diameter is 2 μm-8 μm.
4. The method of claim 1, wherein in the third step, the step of preprocessing is as follows:
step a, decontamination: washing and decontaminating the high-strength high-modulus polyethylene fiber by using an organic solvent, cleaning the high-strength high-modulus polyethylene fiber by using deionized water, and drying the high-strength high-modulus polyethylene fiber for later use;
step b, soaking: taking 0.01-8% of penetrating agent by mass ratio based on the mass of absolute dry fiber; soaking the standby fiber obtained in the step a in water, adding the obtained penetrating agent to soak the fiber, wherein the soaking time is 6-24 hours;
step c, dispersing: taking 0.01-8% of defoaming agent by mass of absolutely dry fiber; and c, adding the taken defoaming agent into the mixed solution obtained in the step b, and then defibering the fibers by using a fiber defibering device to perform mechanical dispersion.
5. The method according to claim 4, wherein in the step b, the penetrating agent is one or more of a penetrating agent JFC, a penetrating agent JFC-2, a penetrating agent JFC-M, a super penetrating agent JFC-E, a low foaming penetrating agent SF or a fast penetrating agent T;
in the step c, one or more of the defoamer organic silicon compound, the condensation product of fatty alcohol and ethylene oxide propylene oxide, propylene glycol polyoxypropylene ether or glycerol polyoxypropylene ether.
6. The method according to claim 1, wherein in the fifth step, the dispersant is one or more of polyethylene oxide, sodium dodecyl benzene sulfonate, sodium carboxymethyl cellulose, MOA-15, MOA-7, methyl cellulose, octadecylamine, sodium hexamethylphosphate or sodium pyrophosphate;
the reinforcing agent is one or more of cationic polyacrylamide, anionic polyacrylamide, amphoteric starch, cationic starch, anionic starch, nonionic starch, cellulose or hemicellulose.
7. The method according to claim 1, wherein the pressing pressure in the sixth step is 0.1MPa to 4MPa, and the drying temperature is 100 ℃ to 130 ℃.
8. The method according to claim 1, wherein the concentration of the thermosetting phenolic resin solution in the seventh step is 1-30%, the sizing amount of the paper sheet is 15-25%, the drying temperature is 40-60 ℃, and the drying time is 10-30 min.
9. The method according to claim 1, wherein the hot pressing conditions in step eight are: the temperature is 100-150 ℃, the pressure is 0.1-30 MPa, and the time is 5-60 min.
10. A thermosetting internal combustion engine filter paper, characterized in that it is prepared by the method according to any one of claims 1 to 9.
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