CN113293649B - Slow qualitative filter paper and preparation method thereof - Google Patents
Slow qualitative filter paper and preparation method thereof Download PDFInfo
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- CN113293649B CN113293649B CN202010109278.8A CN202010109278A CN113293649B CN 113293649 B CN113293649 B CN 113293649B CN 202010109278 A CN202010109278 A CN 202010109278A CN 113293649 B CN113293649 B CN 113293649B
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- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 97
- 229920000742 Cotton Polymers 0.000 claims abstract description 27
- 239000003513 alkali Substances 0.000 claims abstract description 25
- 241000196324 Embryophyta Species 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000011122 softwood Substances 0.000 claims abstract description 16
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004743 Polypropylene Substances 0.000 claims abstract description 13
- -1 polypropylene Polymers 0.000 claims abstract description 13
- 229920001155 polypropylene Polymers 0.000 claims abstract description 13
- 239000005011 phenolic resin Substances 0.000 claims abstract description 12
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 12
- 229920000297 Rayon Polymers 0.000 claims abstract description 11
- 239000011121 hardwood Substances 0.000 claims abstract description 11
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 8
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 8
- 235000004431 Linum usitatissimum Nutrition 0.000 claims abstract description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 8
- 239000011425 bamboo Substances 0.000 claims abstract description 8
- 239000010902 straw Substances 0.000 claims abstract description 8
- 241001349804 Juncus alpinoarticulatus Species 0.000 claims abstract description 7
- 240000006240 Linum usitatissimum Species 0.000 claims abstract 2
- 244000082204 Phyllostachys viridis Species 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 8
- 229920002554 vinyl polymer Polymers 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 6
- 229940037312 stearamide Drugs 0.000 claims description 6
- 244000134552 Plantago ovata Species 0.000 claims description 5
- 235000003421 Plantago ovata Nutrition 0.000 claims description 5
- 239000009223 Psyllium Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 229940070687 psyllium Drugs 0.000 claims description 5
- 239000013055 pulp slurry Substances 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 2
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 claims 2
- 238000004537 pulping Methods 0.000 claims 1
- 238000000967 suction filtration Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 5
- 244000099147 Ananas comosus Species 0.000 abstract description 3
- 235000007119 Ananas comosus Nutrition 0.000 abstract description 3
- 244000060011 Cocos nucifera Species 0.000 abstract description 3
- 235000013162 Cocos nucifera Nutrition 0.000 abstract description 3
- 240000000491 Corchorus aestuans Species 0.000 abstract description 3
- 235000011777 Corchorus aestuans Nutrition 0.000 abstract description 3
- 235000010862 Corchorus capsularis Nutrition 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 240000001398 Typha domingensis Species 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 56
- 241001330002 Bambuseae Species 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 241000208202 Linaceae Species 0.000 description 6
- 230000009172 bursting Effects 0.000 description 4
- 229920002647 polyamide Polymers 0.000 description 4
- 229920001451 polypropylene glycol Polymers 0.000 description 4
- 238000011002 quantification Methods 0.000 description 4
- 229920000881 Modified starch Polymers 0.000 description 3
- 239000004368 Modified starch Substances 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 3
- 239000004480 active ingredient Substances 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 235000019426 modified starch Nutrition 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 244000003416 Asparagus officinalis Species 0.000 description 1
- 235000005340 Asparagus officinalis Nutrition 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241001517197 Cattleya Species 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/004—Methods of beating or refining including disperging or deflaking
- D21D1/006—Disc mills
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- 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
- D21H13/02—Synthetic cellulose fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
-
- 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
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
-
- 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
-
- 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
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
Abstract
The invention relates to the technical field of filter materials, and discloses a slow qualitative filter paper and a preparation method thereof, wherein the slow qualitative filter paper comprises 30-80 parts of mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp; 40-80 parts of mixed pulp of softwood pulp and hardwood pulp; 20-50 parts of mixed plant fiber; 20-40 parts of viscose fiber; 2-5 parts of water-soluble phenolic resin; 2-5 parts of polypropylene fiber; the mixed plant fiber comprises one or a combination of a plurality of bamboo fiber, pineapple fiber, jute fiber, coconut fiber, cattail fiber, straw fiber, flax fiber and Chinese alpine rush pulp, and the slow qualitative filter paper and the preparation method thereof have the advantages of high strength and toughness, difficult breakage in the suction filtration process, no influence on the final separation measurement result, convenient use and environmental protection.
Description
Technical Field
The invention relates to the technical field of filter materials, in particular to a slow qualitative filter paper and a preparation method thereof.
Background
Qualitative filter paper is generally used in a solid-liquid separation process in a laboratory, in order to make calcium and magnesium ions in the filter paper not react with active ingredients in a filter material to influence a final separation measurement result, ash content of the qualitative filter paper is required to be controlled to be 0.2% or less, fiber components of the qualitative filter paper can only be limited in cotton pulp, wood pulp and plant fibers to meet the ash content requirement, the qualitative filter paper prepared by using the components has the characteristics of poor mechanical strength and toughness, in the actual situation of using the qualitative filter paper in the laboratory, in order to accelerate the filtering speed, a suction filtration mode is adopted, and in the suction filtration, in order to prevent the filter paper from being broken to cause filtration failure, an operator stacks a plurality of layers of filter papers in a funnel according to the suction force, the resistance is excessively large, the filtration speed is obviously improved, the consumption amount of the qualitative filter paper is increased, the consumption rate is excessively high, the filtering cost is increased, and the idea of saving and environment protection is not met, for example, chinese patent application publication number: CN107190556a, 22 nd 2017, the invention creates a qualitative filter paper, which comprises, by weight, 30-50 parts of corn stalk fiber, 5-12 parts of polypropylene fiber and 30-50 parts of high density cotton linter pulp, 0.05-2 parts of amphoteric polyacrylamide, 0.2-0.8 part of modified starch light calcium carbonate, 0.05-3 parts of polyethylene oxide with a molecular weight of 250-300 ten thousand, and 0-0.2 part of defoaming agent; the impregnant is modified phenolic resin, and has the defects that the strength and toughness of the filter paper are poor, the requirement on the filter paper in a suction filtration method cannot be met, and the additive adopts modified starch light calcium carbonate which is easy to react with active ingredients in a filter material to influence the final separation measurement result.
Disclosure of Invention
The invention provides a slow qualitative filter paper with high strength and toughness, difficult breakage in the suction filtration process and no influence on the final separation measurement result, and a preparation method thereof, aiming at solving the defects that the strength and toughness of filter paper in the prior art are poor, the requirement of the suction filtration method on the filter paper cannot be met, modified starch light calcium carbonate is adopted in an additive, and the final separation measurement result is easily influenced by reaction with active ingredients in a filter material.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the slow qualitative filter paper comprises the following components in parts by weight:
30-80 parts of mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp; 40-80 parts of mixed pulp of softwood pulp and hardwood pulp; 20-50 parts of mixed plant fiber; 2-5 parts of viscose fiber; 2-5 parts of water-soluble phenolic resin; 2-5 parts of polypropylene fiber; the mixed plant fiber comprises one or more of bamboo fiber, pineapple fiber, jute fiber, coconut fiber, cattleya fiber, straw fiber, flax fiber and Chinese alpine rush pulp.
The main performance index of the slow qualitative filter paper prepared by the following preparation method is up to 9 μm average pore diameter, 15 μm maximum pore diameter, 90+ -5 kPa burst and 27.3N/m stiffness. In the component proportion, the mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp and the mixed pulp of softwood pulp and hardwood pulp form the main components of the slow qualitative filter paper, so that the paper has the characteristics of high flexibility, high folding endurance and high hardwood pulp stiffness of the softwood pulp, and the mixed plant fiber prepared by one or more of bamboo fiber, pineapple fiber, jute fiber, coconut fiber, cattleleaf fiber, straw fiber, flax fiber and asparagus pulp is used as the minor component of the high-performance slow qualitative filter paper, the strength and toughness of the paper can be improved by depending on the inherent performance of the plant fiber, the water-soluble phenolic resin is polymerized as an adhesive, the bursting strength of the paper is improved, and the polypropylene fiber has the characteristics of high strength, good toughness, chemical resistance and good microorganism resistance, and the stability of the paper is improved.
Preferably, the mixed plant fiber comprises the following components in parts by weight:
4-10 parts of bamboo fiber; 4-10 parts of psyllium fiber; 4-10 parts of straw fiber; 4-10 parts of flax fibers; 4-10 parts of Chinese alpine rush pulp. The strength and toughness of the paper can be improved to the greatest extent by neutralizing the component proportion of various plant fibers.
Preferably, the α -cellulose content in the slow qualitative filter paper is not less than 98%. The alpha-cellulose fiber is tough, the formed filter aid layer is not suitable for peeling and cracking, and has a certain electrostatic adsorption effect, so that the filter efficiency can be improved, and the higher the content of the alpha-cellulose, the better the strength and toughness of paper and the higher the filter efficiency.
Preferably, the ratio of softwood pulp to hardwood pulp is 3:2. The proportion of the softwood pulp and the hardwood pulp is reasonably regulated to balance the flexibility and the stiffness of the paper.
Preferably, the quantitative amount of the slow qualitative filter paper is 80+/-4 g/square meter. Proper quantification is determined to balance the relationship between strength, filtration and rate, too high a quantification would result in too thick a substrate and reduced filtration rate, while too low a quantification would not meet the requirements for strength and filtration.
A preparation method of slow qualitative filter paper comprises the following steps:
a) 30-80 parts of mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp, 2-5 parts of water-soluble phenolic resin and 2-5 parts of viscose fiber are fluffed by a fiber fluffer, and then are subjected to on-line grinding by a double-disc refiner to obtain pulp with pulp degree of 24-27 DEG SR,
b) Taking 40-80 parts of mixed pulp of softwood pulp and hardwood pulp, 2-5 parts of polypropylene fiber and 20-50 parts of mixed plant fiber; fluffing by a fluffer, and online polishing by a double-disc refiner to obtain pulp slurry with the pulp degree of 24-27 DEG SR.
c) Placing the slurry prepared in the step a) and the step b) in a multi-layer headbox and filtering water through a forming screen to form.
d) And c) drying the formed paper obtained in the step c) through a drying cylinder to obtain the target qualitative filter paper.
Preferably, 1 to 1.5 parts of dispersant and 1 to 1.5 parts of wet strength agent are added simultaneously with the fluffing process in both step a) and step b). The addition of the dispersing agent and the wet strength agent is used for improving the folding endurance, the surface strength and the transverse expansion rate of the paper.
Preferably, the dispersing agent is vinyl bis-stearamide, and the wet strength agent is polyamide-based polypropylene oxide resin.
The slow qualitative filter paper and the preparation method thereof have the following advantages: high strength, good toughness, difficult damage in the suction filtration process, no influence on the final separation measurement result, convenient use and environmental protection.
Drawings
Table 1 is a table of technical parameters of the slow qualitative filter paper.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Comparative example
The main performance indexes of the slow qualitative filter paper product comprise a ration of 41 g/square meter, a bursting strength of 67kPa, a maximum aperture of 12 mu m, an average aperture of 9 mu m and ash content of 0.18 percent.
Example 1
The slow qualitative filter paper is obtained by calculating according to parts by weight: 30 parts of mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long-staple pulp, 40 parts of mixed pulp of softwood pulp and alkali-treated cotton long-staple pulp, 20 parts of mixed plant fiber, 2 parts of viscose fiber, 2 parts of water-soluble phenolic resin and 2 polypropylene fiber, wherein the mixed plant fiber comprises 4 parts of bamboo fiber, 4 parts of psyllium fiber, 4 parts of straw fiber, 4 parts of flax fiber and 4 parts of Chinese alpine rush pulp.
The target slow qualitative filter paper is prepared according to the following steps:
a) The mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp, water-soluble phenolic resin and viscose fiber are fluffed by a fiber fluffer, 1 part of vinyl bis-stearamide and 1 part of polyamide polypropylene oxide resin are added, and then the pulp with the pulp degree of 24-27 DEG SR is obtained by on-line polishing by a double-disc refiner,
b) Fluffing the softwood pulp, the polypropylene fiber and the mixed plant fiber by a fiber fluffer, simultaneously adding 1 part of vinyl bis-stearamide and 1 part of polyamide-epichlorohydrin resin, and carrying out online polishing by a double-disc refiner to obtain pulp slurry with the pulp degree of 24-27 DEG SR.
c) Placing the slurry prepared in the step a) and the step b) in a multi-layer headbox and filtering water through a forming screen to form.
d) And c) drying the formed paper obtained in the step c) through a drying cylinder to obtain the target qualitative filter paper.
Example 2
The slow qualitative filter paper is obtained by calculating according to parts by weight: 60 parts of mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long-staple pulp, 60 parts of mixed pulp of softwood pulp and hardwood pulp, 35 parts of mixed plant fiber, 4 parts of viscose fiber, 3 parts of water-soluble phenolic resin and 3 polypropylene fiber, wherein the mixed plant fiber comprises 7 parts of bamboo fiber, 7 parts of psyllium fiber, 7 parts of straw fiber, 7 parts of flax fiber and 7 parts of Chinese alpine rush pulp.
The target slow qualitative filter paper is prepared according to the following steps:
a) The mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp, water-soluble phenolic resin and viscose fiber are fluffed by a fiber fluffer, 1.3 parts of vinyl distearamide and 1.3 parts of polyamide polypropylene oxide resin are added, and then the pulp with the pulp degree of 24-27 DEG SR is obtained by on-line polishing by a double-disc refiner,
b) Fluffing the softwood pulp, the polypropylene fiber and the mixed plant fiber by a fiber fluffer, simultaneously adding 1 part of vinyl bis-stearamide and 1 part of polyamide-epichlorohydrin resin, and carrying out online polishing by a double-disc refiner to obtain pulp slurry with the pulp degree of 24-27 DEG SR.
c) Placing the slurry prepared in the step a) and the step b) in a multi-layer headbox and filtering water through a forming screen to form.
d) And c) drying the formed paper obtained in the step c) through a drying cylinder to obtain the target qualitative filter paper.
Example 3
The slow qualitative filter paper is obtained by calculating according to parts by weight: 80 parts of mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long-staple pulp, 80 parts of mixed pulp of softwood pulp and hardwood pulp, 50 parts of mixed plant fiber, 5 parts of viscose fiber, 5 parts of water-soluble phenolic resin and 5 polypropylene fiber, wherein the mixed plant fiber comprises 10 parts of bamboo fiber, 10 parts of psyllium fiber, 10 parts of straw fiber, 10 parts of flax fiber and 10 parts of Chinese alpine rush pulp.
The target slow qualitative filter paper is prepared according to the following steps:
a) The mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp, water-soluble phenolic resin and viscose fiber are fluffed by a fiber fluffer, 1.5 parts of vinyl distearamide and 1.5 parts of polyamide polypropylene oxide resin are added, and then the pulp with the pulp degree of 24-27 DEG SR is obtained by on-line polishing by a double-disc refiner,
b) Fluffing the softwood pulp, the polypropylene fiber and the mixed plant fiber by a fiber fluffer, simultaneously adding 1 part of vinyl bis-stearamide and 1 part of polyamide-epichlorohydrin resin, and carrying out online polishing by a double-disc refiner to obtain pulp slurry with the pulp degree of 24-27 DEG SR.
c) Placing the slurry prepared in the step a) and the step b) in a multi-layer headbox and filtering water through a forming screen to form.
d) And c) drying the formed paper obtained in the step c) through a drying cylinder to obtain the target qualitative filter paper.
The performance of the slow qualitative filter papers prepared in comparative examples and examples 1-3 is tested, the test results are shown in Table 1, wherein the quantitative test adopts a side-fixing method of GB/T451.2-2002 paper and paperboard quantification; the bursting strength is measured by a Heltz Bei Geshi instrument, and the filtration time is measured by using 10cm 2 Area filter paper was used to filter 10ml (23.+ -. 1 ℃ C.) of distilled water; method for measuring moisture and breakage resistance, wherein the measuring instrument is a Heltz Bei Geshi instrument, at least 6 samples with diameter (50+ -0.5) mm are cut along the paper web for later use, the cylinder is filled with distilled water or deionized water or purified water with equivalent purity, the valve is closed, and the water valve is opened to make the cylinderThe water level is lowered to 325mm, a single sample is put in a house exchange room, and the sample is clamped; slowly unscrewing the air valve, wherein the speed of unscrewing the air valve is preferably 20 mm-30 mm in the water level 5s in the funnel tube, so that the water pressure born by the sample is gradually increased until the sample breaks, reading the height of the rising water level in the funnel tube at the moment, namely the wet burst of the sample, wherein the unit is mm water column (1 mm water column=9.8 Pa), 4 samples are measured for each sample, and the average value of the measurement results of the 4 samples is used for representing the result.
According to the content of Table 1, the obtained slow qualitative filter paper can effectively improve the strength, toughness and bursting strength of paper, and has the advantages of high filtering speed, low ash content and suitability for a suction filtration method.
The raw materials and facilities used in the present invention are common raw materials and facilities used in the art unless otherwise specified, and the methods used in the present invention are common methods used in the art unless otherwise specified.
The slow qualitative filter paper and the preparation method thereof have the beneficial effects of high strength, high toughness, difficult breakage in the suction filtration process, no influence on the final separation measurement result, convenience in use and environmental protection.
Claims (7)
1. The slow qualitative filter paper is characterized by comprising the following components in parts by weight:
30-80 parts of mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp;
40-80 parts of mixed pulp of softwood pulp and hardwood pulp;
20-50 parts of mixed plant fiber;
2-5 parts of viscose fiber;
2-5 parts of water-soluble phenolic resin;
2-5 parts of polypropylene fiber;
the mixed plant fiber comprises the following components in parts by weight:
4-10 parts of bamboo fiber;
4-10 parts of psyllium fiber;
4-10 parts of straw fiber;
4-10 parts of flax fibers;
4-10 parts of Chinese alpine rush pulp.
2. A slow qualitative filter according to claim 1, wherein the α -cellulose content in the slow qualitative filter is not less than 98%.
3. A slow qualitative filter according to claim 1 wherein the ratio of softwood pulp to hardwood pulp is 3:2.
4. The slow qualitative filter paper according to claim 1, wherein the quantitative amount of the slow qualitative filter paper is 80.+ -. 4 g/square meter.
5. A method of preparing a slow qualitative filter paper according to claims 1-4, comprising the steps of:
a) Taking 40-100 parts of mixed pulp of alkali-treated cotton linter pulp and alkali-treated cotton long linter pulp, 2-5 parts of water-soluble phenolic resin and 2-5 parts of viscose fiber to be fluffed by a fiber fluffer, and carrying out online polishing by a double-disc refiner to obtain pulp with pulp degree of 24-27 DEG SR;
b) Taking 40-100 parts of softwood pulp, 2-5 parts of polypropylene fiber and 20-50 parts of mixed plant fiber; fluffing by a fluffer, and carrying out online grinding by a double-disc pulping machine to obtain pulp slurry with the pulp degree of 24-27 DEG SR;
c) Placing the slurry prepared in the step a) and the step b) in a multi-layer slurry box and filtering water through a forming screen to form;
d) And c) drying the formed paper obtained in the step c) through a drying cylinder to obtain the target qualitative filter paper.
6. The method for preparing a slow qualitative filter paper according to claim 5, wherein 1-1.5 parts of dispersant and 1-1.5 parts of wet strength agent are added at the same time of the fluffing process in the step a) and the step b).
7. The method for preparing a slow qualitative filter paper according to claim 6, wherein the dispersing agent is vinyl bis stearamide and the wet strength agent is polyamide-epichlorohydrin resin.
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