CN115087777A - Method for producing pulp and method for producing recycled aramid paper - Google Patents
Method for producing pulp and method for producing recycled aramid paper Download PDFInfo
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- CN115087777A CN115087777A CN202080097143.2A CN202080097143A CN115087777A CN 115087777 A CN115087777 A CN 115087777A CN 202080097143 A CN202080097143 A CN 202080097143A CN 115087777 A CN115087777 A CN 115087777A
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- aramid
- paper
- aramid paper
- pulp
- water
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- 239000004760 aramid Substances 0.000 title claims abstract description 202
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 202
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000000835 fiber Substances 0.000 claims abstract description 56
- 238000010494 dissociation reaction Methods 0.000 claims abstract description 47
- 230000005593 dissociations Effects 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 13
- 229920001131 Pulp (paper) Polymers 0.000 abstract description 4
- 238000010298 pulverizing process Methods 0.000 description 15
- 238000005520 cutting process Methods 0.000 description 13
- 239000000428 dust Substances 0.000 description 10
- -1 polyisophthaloyl Polymers 0.000 description 8
- 238000002156 mixing Methods 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 229920006231 aramid fiber Polymers 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 238000010009 beating Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 description 3
- 229920000784 Nomex Polymers 0.000 description 3
- 239000002518 antifoaming agent Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000010292 electrical insulation Methods 0.000 description 3
- 239000004763 nomex Substances 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920003043 Cellulose fiber Polymers 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 239000002609 medium Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- MHSKRLJMQQNJNC-UHFFFAOYSA-N terephthalamide Chemical compound NC(=O)C1=CC=C(C(N)=O)C=C1 MHSKRLJMQQNJNC-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 241000264877 Hippospongia communis Species 0.000 description 1
- 238000012695 Interfacial polymerization Methods 0.000 description 1
- 239000004693 Polybenzimidazole Substances 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- 229920003367 Teijinconex Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 150000004984 aromatic diamines Chemical class 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000013054 paper strength agent Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920000889 poly(m-phenylene isophthalamide) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920002480 polybenzimidazole Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- 239000004765 teijinconex Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Images
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
- 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
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
- D04H1/4334—Polyamides
- D04H1/4342—Aromatic polyamides
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The invention provides a method for manufacturing paper pulp, which can be reused as a raw material for papermaking without finely crushing leftover materials or damaged materials of aramid paper. A method for producing pulp for dissociating aramid paper composed of aramid staple fibers and aramid fibrids in water, comprising a dissociation step of putting dry aramid paper into water to dissociate the aramid paper, wherein in the dissociation step, the aramid paper is dissociated by using a dissociation machine (1) having a stirring force in the vertical direction.
Description
Technical Field
The present invention relates to a method for producing pulp and a method for producing recycled aramid (aramid) paper.
Background
As paper made of a material having improved strength and thermal stability, there is aramid paper. Aramid paper is synthetic paper composed of aramid, has excellent heat resistance, flame resistance, electrical insulation, toughness, and flexibility, and is used as an electrical insulating material and a substrate for airplane honeycombs. Of these materials, paper containing Nomex (registered trademark) fiber of DuPont (DuPont) (usa) is produced by mixing poly (m-phenylene isophthalamide) floc and fibrids in water, and making paper from the mixed slurry and performing a calendering process. The paper has high strength and toughness even at high temperatures, and also has excellent electrical insulation properties.
Heretofore, methods of recycling scrap or damaged materials generated in the production process of such aramid paper have been studied. For example, patent document 1 discloses aramid paper containing aramid pulp produced by pulverizing dry aramid paper into a size that can pass through a sieve of 6.4 to 12.7mm and using the dry aramid paper.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 3012365.
Disclosure of Invention
Problems to be solved by the invention
In the invention described in patent document 1, the pulverization is carried out in a size that can pass through a sieve of 6.4 to 12.7 mm. This is due to: if the dry aramid paper is not pulverized to a fine size, the aramid paper cannot be sufficiently dissociated. However, if the dry aramid paper is pulverized into a fine size, dust is easily generated, and if the pulverized aramid paper is fed into a separator, there is a problem that fine paper pieces or paper powder fly.
The present invention has been made in view of the above problems, and an object thereof is to provide: a paper pulp manufacturing method capable of reusing as a raw material for papermaking without finely crushing the paper sheet of aramid paper; and a method for producing the regenerated aramid paper.
Means for solving the problems
The present invention has been completed based on the following findings: the aramid paper is dissociated by using the dissociator with stirring force in the vertical direction, and the raw material for papermaking can be obtained without crushing the dried aramid paper into smaller size.
A method for producing pulp according to an aspect of the present invention is characterized in that: the pulp manufacturing method is a pulp manufacturing method for dissociating aramid paper composed of aramid short fibers and aramid fibrids in water, and comprises a dissociation step of putting dry aramid paper into water to dissociate the aramid paper, wherein in the dissociation step, the aramid paper is dissociated in the water by using a dissociation machine which is configured in a mode of generating vertical stirring force.
The aramid paper has a low affinity with water, and even if pieces of the aramid paper are put into water, the pieces of the aramid paper float on the water surface and cannot be sufficiently dissociated. Particularly, the aramid paper is not easy to sink into water under the condition of large size. In contrast, according to the above-described pulp production method, since the dissociation step is performed using the dissociator configured to generate a vertical stirring force, even in the case of a large-sized aramid paper sheet, the sheet does not stay on the water surface but sinks into the water and reflows, so that the aramid paper can be dissociated and reused as a raw material for paper making. Thus, the dry aramid paper can be reused as a raw material for papermaking without being pulverized finely or the like.
In one embodiment of the present invention, the maximum size of the aramid paper put into water in the dissociation step exceeds 12.7 mm.
Since aramid paper has low affinity with water, large paper sheets having a maximum size of more than 12.7mm float on the water surface and cannot be separated. In contrast, according to the above-described pulp production method, the sheet pieces of aramid paper having a maximum size exceeding 12.7mm can be detached because the sheet pieces are immersed in water and refluxed by the stirring force in the vertical direction.
In one embodiment of the present invention, the maximum size of the aramid paper to be put into water at the time of dissociation is 50mm or more.
As described above, according to one aspect of the present invention, since the aramid paper is dissociated in water using the dissociator configured to generate a vertical stirring force, even a large-sized aramid paper having a maximum size of 50mm or more can be dissociated by sinking the paper sheet into water. Therefore, according to the above-described pulp production method, the generation of dust and the like in the crushing/cutting step can be suppressed without crushing the aramid paper to be fine.
In one embodiment of the present invention, the aramid paper to be put into water at the time of dissociation has a continuous sheet shape.
As described above, according to one aspect of the present invention, since the aramid paper is dissociated in water using the dissociator configured to generate a vertical stirring force, even if the aramid paper is a continuous sheet-shaped aramid paper, the sheet can be dissociated by being sunk into water. Therefore, according to the above-described pulp production method, the generation of dust and the like in the crushing/cutting step can be suppressed without crushing the aramid paper to be fine.
In one aspect of the present invention, the method further includes a wet refining step of performing wet refining on the aramid paper after the dissociation step.
According to the paper pulp manufacturing method, the granularity of the paper sheet of the aramid paper can be reduced, and the high-quality aramid paper can be regenerated.
The method for manufacturing the regenerated aramid paper according to one embodiment of the present invention is characterized in that: comprising a papermaking step of papermaking the pulp obtained by the above-mentioned pulp production method.
Effects of the invention
According to the present invention, there is provided a method for producing pulp, which can be reused as a raw material for paper making without finely pulverizing an edge material or a damaged material of aramid paper.
Drawings
Fig. 1 is a perspective view (oblique view) showing the structure of a separator used in a method for producing pulp according to an embodiment of the present invention.
Detailed Description
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[ aramid fiber ]
In the present embodiment, the aramid fiber is a linear polymer compound in which 60% or more of amide bonds are directly bonded to an aromatic ring. Examples of such aramid fibers include: polyisophthaloyl metaphenylene diamine (polymetaphenylene isophthalamide) and copolymers thereof, polyparaphenylene terephthalamide (polyparaphenylene terephthalamide) and copolymers thereof, copolyphenylene-3, 4'-diphenyl ether terephthalamide (polyparaphenylene 3,4' -diphenylether terephthalamide) and the like. These aramids can be industrially produced by, for example, a solution polymerization method based on a condensation reaction between an aromatic acid dichloride (aromatic acid dichloride) and an aromatic diamine, a two-stage interfacial polymerization method, and the like, and are commercially available products, but are not limited thereto. Among these aramids, polyisophthaloyl metaphenylene diamine is preferably used in view of its excellent molding processability, thermal adhesiveness, flame retardancy, heat resistance and other properties.
[ aramid fibrids ]
In the present embodiment, the aramid fibrids are film-like fine particles made of aramid, and may be referred to as aramid pulp (aramid pulp). As a production method, for example, methods described in Japanese patent publication No. 35-11851 and Japanese patent publication No. 37-5732 are known. The aramid fibrids have papermaking properties like ordinary wood (cellulose) pulp, and can be formed into sheets by a paper machine after being dispersed in water. In addition, in order to ensure quality (quality) suitable for paper making, so-called beating treatment may be performed in the production of the aramid fibrids. The beating process may be performed by a disc refiner, a beater (coater), or other paper stock processing equipment that applies a mechanical cutting action. The morphology change of the fibrids in the beating treatment can be monitored according to the freeness (freeness) specified in JIS P8121. In the present embodiment, the drainage of the aramid fibrids after the beating treatment is preferably 10 to 300cm 3 (Canadian Standard freeness) of Water drainageAnd (4) the following steps. At drainage degree greater than 300cm 3 In the aramid fibrid of (2), the strength of the sheet-like material formed from the aramid fibrid may be lowered. On the other hand, if less than 10cm is desired 3 The draining-degree of the aramid fibrids of (a) reduces the utilization efficiency of the mechanical power to be input, and also tends to reduce the amount of treatment per unit time, and the aramid fibrids are excessively refined, which tends to cause a so-called deterioration in the function of the binder.
[ aramid short fiber ]
In the present embodiment, the aramid short fiber is a heat-resistant short fiber obtained by cutting a fiber made of aramid as a raw material into a predetermined length, and examples of such a fiber include: fibers available under the trade names "Teijinconex (registered trademark)" of imperial corporation and "Nomex (registered trademark)" of dupont, but are not limited thereto. The length of the aramid staple fiber may be generally selected from the range of 1mm or more and less than 25mm, preferably 2mm or more and less than 12 mm.
[ Heat-resistant short fibers ]
In the present embodiment, the heat-resistant short fibers are fibers obtained by cutting fibers made of a non-meltable material or a material having a melting point exceeding 320 ℃, for example, aramid (aromatic polyamide), aramid imide, polyimide, polybenzimidazole, polyarylate, polyether ether ketone, or an inorganic material, for example, glass, a ceramic material, alumina, or the like, into a predetermined length. The length of the heat-resistant short fibers may be selected from the range of 1mm or more and less than 25mm, preferably 2mm or more and less than 12 mm. If the length of the heat-resistant short fibers is less than 1mm, mechanical properties of the sheet material are deteriorated, while heat-resistant short fibers of 25mm or more are not preferable because they are likely to cause defects such as "entanglement" and "bundling" when produced by a wet process described later.
The heat-resistant short fiber has a fiber diameter of 0.1 to 40μm is preferably 0.5 to 25μm, more preferably 1 to 20μm。
[ aramid paper ]
In the present embodiment, the aramid paper means a paper consisting mainly ofThe sheet-like material comprising aramid fibrids and aramid short fibers has a thickness of 20μm～1000μA thickness in the range of m. Furthermore, the aramid paper has a density of 10g/m 2 ～1000g/m 2 Basis weight in the range of (a).
The aramid paper is produced by a method in which the aramid fibrids and the aramid short fibers are mixed and the mixed aramid fibrids and aramid short fibers are formed into a sheet. Specifically, for example, the following wet papermaking method is preferably selected: the aramid fibrids and the aramid short fibers are dispersed and mixed in water, and then discharged onto a liquid-permeable support such as a net or a belt to be formed into a sheet, and the liquid is removed and dried. The mixing ratio of the aramid fibrids and the aramid short fibers is arbitrary, but the ratio (mass ratio) of the aramid fibrids/the aramid short fibers is preferably 1/9 to 9/1, more preferably 2/8 to 8/2.
In the wet papermaking method, the following methods are known: the method comprises the steps of conveying aqueous slurry at least containing single or mixture of aramid fibrids and aramid short fibers to a paper machine for dispersion, dewatering, pressing and drying, and then winding into sheets. As the paper machine, a fourdrinier paper machine, a cylinder paper machine, an inclined paper machine, a combination paper machine in which these are combined, and the like are used. In the case of manufacturing by a combination paper machine, a composite sheet composed of a plurality of paper layers can be obtained by forming sheets from slurries having different blending ratios and then joining the sheets together. In the paper making, additives such as a dispersibility improving agent, a defoaming agent, and a paper strength agent are used as necessary.
In addition, other fibrous components (for example, fibers made of a material used for heat-resistant short fibers, or organic fibers such as polyphenylene sulfide fibers, cellulose fibers, PVA fibers, and polyester fibers) may be added. In this case, the proportion of the aramid short fibers in the total constituent fibers is 80 wt% or more, and more preferably 90 wt% or more.
[ Heat-resistant pulp ]
In the present embodiment, the heat-resistant pulp refers to a pulverized product obtained by pulverizing a sheet-like product obtained by mixing heat-resistant short fibers and, for example, aramid fibrids, and specifically refers to a pulp obtained by pulverizing and refining the above-described aramid paper.
[ method for producing pulp ]
The method for producing pulp of the present embodiment is a method for producing pulp by performing the following steps: a dissociation step of putting dry aramid paper into water and dissociating the aramid paper to obtain heat-resistant pulp; and a wet refining step of subjecting the heat-resistant pulp to wet refining. The pulverization/cutting step of pulverizing the aramid paper may be performed before the dissociation step, or the dust removal step may be performed after the dissociation step, or the dust prevention step or the wet sieving step may be performed after the wet micronization treatment step.
[ dissociation step ]
The dissociation step is to dissociate the dry aramid paper (hereinafter referred to as "dry aramid paper") obtained by drying the above aramid paper in water using a dissociator having a stirring force in the vertical direction. As the disengager having a stirring force in the vertical direction, for example, a Pulper, a kneader, an Intensa pulp, or the like in which a rotor is disposed on a side surface (wall surface) of a tank is preferably used, but the disengager is not limited to these.
Fig. 1 is a perspective view showing the structure of a separator used in the pulp production method of the present embodiment. As shown in fig. 1, the separator 1 is a so-called Intensa pulp, and includes a tank 6, a motor 2, and a rotor 4.
The tank 6 includes a bottom surface 6A disposed obliquely and a side wall 6B provided upright on an edge of the bottom surface 6A. The lower surface of the bottom surface 6A of the tank 6 is supported by being connected to a plurality of leg members 8. The plurality of leg members 8 are different in length and supported so that the side provided with the rotor 4 is located below.
The bottom surface 6A is elliptical and inclined downward toward the rotor 4. The side wall 6B extends vertically upward from the edge of the bottom surface 6A, and has a tapered shape with its tip end directed toward the center. A circular opening is formed in a portion surrounded by the upper end edge of the side wall 6B.
The rotor 4 is formed by a circular disk having a plurality of blades radially extending from the center outward in the radial direction. The rotor 4 is provided at one end portion along the long axis of the bottom surface 6A of the tank 6, and is located at the lowermost portion of the bottom surface 6A. The rotor 4 is connected to a rotating shaft of the motor 2 disposed below the tank 6. The rotor 4 is rotated by rotationally driving the rotary shaft of the motor 2.
A baffle 10 extending in the vertical direction along the side wall 6B is provided in the tank body 6. The baffle 10 is provided at the other end along the long axis of the bottom surface 6A of the tank body 6. The horizontal cross section of the baffle 10 is triangular, and the width and depth (depth) thereof increase upward. The baffle 10 extends over substantially the entire length of the side wall 6B in the vertical direction.
The tank body 6 of the separator 1 is filled with water. When the rotor 4 rotates, a swirling flow centered on the rotation axis of the rotor 4 is generated over the entire vertical area. Since the bottom surface 6A of the trough 6 is inclined downward toward the rotor 4, the swirling flow near the bottom surface 6A of the trough 6 becomes an upward flow. When the swirling flow hits the baffle 10, a downward flow is generated. Thereby, an upward flow flowing from the bottom to the vicinity of the surface and a downward flow flowing from the vicinity of the surface to the bottom are generated in the tank body 6, and these upward and downward flows act as an agitation force that agitates the paper sheet in the vertical direction. The paper sheet present at the bottom in the chute body 6 rises due to the upward flow, and the paper sheet present near the water surface is pulled into the bottom of the chute body 6 due to the downward flow and is cut by the blades of the rotor 4.
Generally, aramid paper has a low affinity for water and does not sink into water by contact with water alone. Therefore, for example, in a low-consistency pulper or a high-consistency pulper for defibrating pulp fibers made of wood pulp, which has a rotor at the center of the bottom surface of a cylindrical tank, aramid paper and water are not easily mixed and cannot be defibrated. Therefore, it is difficult to manufacture heat-resistant pulp on an industrial scale.
In the present embodiment, the dimension (or the maximum dimension) of the long side of the dry aramid paper put into water in the dissociation step is a dimension exceeding 12.7mm, and preferably 50mm or more. In the case of using a fine size of 12.7mm or less, the affinity with water is improved as the specific surface area of the dried aramid paper increases as the size becomes smaller, but it is not preferable in terms of working environment in the pulverizing/cutting step because dust is easily generated in the pulverizing/cutting step, and the pulverizing efficiency is lower as the size becomes smaller, and it is very difficult to handle because dust or paper pieces fly when the pulverized aramid paper is put into a separator later.
The size and shape of the dry aramid paper charged into water are not limited to these, and the dry aramid paper charged into water in the dissociation step may have a continuous sheet shape. In the present embodiment, the continuous sheet shape means a sheet having a long side of 1m or more, and the width is 10 to 3000mm, preferably 50 to 2000mm, although the width depends on the size of the tank body of the separator.
The concentration of the aramid paper in the dissociation step is 1.0 to 7.0 wt%, preferably 1.5 to 6.0 wt%, and more preferably 2.0 to 5.0 wt%. If the concentration of the aramid paper is less than 1.0 wt%, the obtained heat-resistant pulp is relatively decreased, which is not preferable in terms of production efficiency, and if it exceeds 7.0 wt%, the viscosity of the pulp upon dissociation is too high, and dissociation becomes difficult. The liquid temperature of the heat-resistant slurry suspension in the dissociation step is 10 to 80 ℃, preferably normal temperature to 70 ℃. In general, the dissociation efficiency is improved by increasing the liquid temperature, but if it exceeds 80 ℃, the effect is saturated, and therefore energy is wasted, which is not preferable.
In addition, in the dissociation, additives such as a dispersibility improving agent, a defoaming agent, a paper strength enhancing agent, or a dissociation promoter, which can be added even in the above-mentioned paper making, can be used.
[ crushing/cutting Process ]
Before the dry aramid paper is fed into the separator, the dry aramid paper is subjected to a crushing/cutting process in a case where the dry aramid paper is large with respect to the opening of the tank 6. In the crushing/cutting step, the dry aramid paper is crushed and/or cut into a sheet having a size with a long side (maximum size) exceeding 12.7mm, more preferably a size with a long side of 50mm or more. The long side (maximum dimension) of the dried aramid paper is preferably 1000mm or less. The pulverization method is not particularly limited, and a method of pulverizing by a dry method is preferable. Specifically, there may be mentioned: the method of pulverizing the raw material using a shredder (shredder), a crusher (crusher), a ball mill, a jet mill, or the like, but is not limited thereto. In the present invention, a shredder is preferably used in terms of less dimensional variation during cutting and less generation of dust.
[ Wet micronization Process ]
The heat-resistant pulp obtained in this way can be subjected to a wet refining step of performing a wet refining treatment. The wet micronization treatment is a method of reducing the particle size of the paper sheet by applying impact to the aramid paper in an aqueous medium, and examples of an apparatus for effectively performing such micronization treatment include, but are not limited to, a high-speed disintegrator, a refiner, a beater, and the like.
The index of the properties of the heat-resistant pulp that can be subjected to the wet refining treatment includes a degree of dissociation, and in the present embodiment, the degree of dissociation is 30% or more, preferably 35% or more.
When the sheet size of the dry aramid paper is large, the dissociation becomes insufficient, and there is a possibility that a large-sized sheet may remain in the pulp. Therefore, particularly when the size of the dry aramid paper charged into water at the time of the dissociation step is 50mm or more, the degree of dissociation is preferably 30% or more.
[ degree of dissociation ]
In the present embodiment, the dissociation degree is obtained by providing 150 g of heat-resistant pulp after dissociation treatment in an amount corresponding to an absolute dry weight of 10g using an experimental screen device provided with screen plates as defined in JIS P8232μThe mesh device of the plate with the m-slit gap is calculated by the following equation, which is expressed by the absolute dry weight ratio of the heat-resistant pulp after passing through the mesh and the total mass of the heat-resistant pulp charged.
[ absolute dry weight of aramid pulp after passing through the screen ]/([ absolute dry weight of aramid pulp remaining on the screen ] + [ absolute dry weight of aramid pulp after passing through the screen ]) × 100(%)
[ method for producing recycled aramid paper ]
The recycled aramid paper of the present embodiment is produced by the following method: the pulp obtained by the above-described pulp production method is formed into a sheet by either a single process or a process in which the pulp is mixed with aramid fibrids, aramid short fibers, or the like.
In the production of the sheet, for example, the following methods can be applied: a method of forming a sheet by air flow after dry blending the aramid pulp and aramid fibrids or aramid short fibers; among the above methods, a so-called wet papermaking method using water as a medium is also preferable, in which the aramid pulp, the aramid fibrids, the aramid short fibers, or the like are dispersed and mixed in a liquid medium, and then discharged onto a liquid-permeable support, for example, a net or a belt, formed into a sheet, and the liquid is removed and dried.
The wet papermaking method comprises the following steps: an aqueous slurry containing at least the above aramid pulp and/or aramid fibrid singly or in combination is transferred to a paper machine and dispersed, and then is subjected to dewatering, pressing, and drying operations to be wound into a sheet. As the paper machine, a fourdrinier paper machine, a cylinder paper machine, an inclined paper machine, a combined paper machine in which these are combined, and the like are used. In the case of manufacturing by a combination paper machine, a composite sheet composed of a plurality of paper layers can be obtained by sheet-forming and combining slurries having different blending ratios. In the papermaking, additives such as a dispersibility improving agent, a defoaming agent, and a paper strength enhancing agent are used as necessary.
In addition, other fibrous components (for example, organic fibers such as aramid fibers, polyphenylene sulfide fibers, polyether ether ketone fibers, cellulose fibers, PVA fibers, polyester fibers, aryl fibers, liquid crystal polyester fibers, and polyimide fibers, and inorganic fiber glass fibers such as glass fibers, rock wool, asbestos, and boron fibers) may be added. In this case, the proportion of the aramid short fibers in the total constituent fibers is 80 wt% or more, and more preferably 90 wt% or more.
In the recycled aramid paper of the present embodiment, since the aramid fibrids have excellent characteristics as a binder, fine particles and other additive components can be efficiently captured. In addition, in the production of the aramid paper of the present embodiment, the raw material yield is improved, and the through-holes are reduced by stacking the sheets in layers, thereby improving the electrical insulation.
The regenerated aramid paper thus obtained can be improved in density and mechanical strength by hot-pressing between a pair of flat plates or between metal rolls at high temperature and high pressure. For example, when a metal roll is used, the hot pressing conditions include, but are not limited to, a temperature of 100 to 350 ℃ and a linear pressure of 50 to 400 kg/cm. Instead of the heating operation, only the pressurization may be performed at normal temperature. A plurality of the regenerated aramid papers may be stacked at the time of hot press processing. The hot press processing described above may be performed plural times in any order.
[ Effect ]
According to the present embodiment, the following operational effects can be obtained.
The aramid paper has a low affinity with water, and even if pieces of the aramid paper are put into water, the pieces of the aramid paper float on the water surface and cannot be sufficiently dissociated. Particularly, the aramid paper is not easy to sink into water under the condition of large size. In contrast, according to the present embodiment, since the dissociation step is performed by the dissociator 1 configured to generate the stirring force in the vertical direction, even if the paper piece of the aramid paper having a large size is used, the paper piece does not stay on the water surface but sinks into the water to be refluxed, and therefore the aramid paper can be dissociated and reused as a raw material for paper making. Therefore, the dry aramid paper can be reused as a raw material for papermaking without being crushed to be thin and the like.
Further, since aramid paper has low affinity with water, a large paper sheet having a maximum size of more than 12.7mm floats on the water surface and cannot be separated. In contrast, according to the present embodiment, since the sheet pieces sink into the water by the stirring force in the vertical direction and are refluxed, even the sheet pieces of aramid paper having a maximum size exceeding 12.7mm can be dissociated.
In the present embodiment, since the aramid paper is dissociated in water using the dissociator 1 configured to generate the stirring force in the vertical direction, even a large-sized aramid paper having a maximum size of 50mm or more can be dissociated by sinking the paper piece into water. Therefore, according to the present embodiment, it is not necessary to pulverize the aramid paper to be fine, and generation of dust or the like in the pulverizing step can be suppressed.
In the present embodiment, since the aramid paper is dissociated in water using the dissociator 1 configured to generate the stirring force in the vertical direction, even if the aramid paper is a continuous sheet-shaped aramid paper, the sheet can be dissociated by being immersed in water. Therefore, according to the present embodiment, it is not necessary to pulverize the aramid paper to be fine, and generation of dust and the like in the pulverization step can be suppressed.
In addition, since the present embodiment includes the wet-type refining step of performing wet-type refining on the aramid paper, the particle size of the paper piece of the aramid paper can be reduced, and high-quality aramid paper can be reproduced.
Examples
The present invention will be described below with reference to examples. It should be noted that these examples are provided to illustrate the present invention, and do not limit the present invention.
[ preparation of raw Material ]
A fibrid of polyisophthaloyl metaphenylene diamine was produced by the method described in Japanese patent publication (Kokoku) No. 52-15621 using a pulp pellet production apparatus (wet precipitator) comprising a combination of a stator and a rotor. The fiber was treated with a disengager or a beater to adjust the length-weighted average fiber length to 0.9mm (freeness of aramid fibrid: 100ml (canadian standard freeness)). On the other hand, a meta-aramid fiber (Nomex (registered trademark) having a filament fineness of 2 denier) manufactured by dupont was cut into a length of 6mm to obtain an aramid short fiber. [ production of Dry aramid paper ]
The prepared aramid fibrids and aramid short fibers are respectively dispersed in water to prepare the slurry. These slurries were mixed so that the aramid fibrids and the aramid short fibers were blended at a blending ratio (weight ratio) of 1/1, and then transferred to a fourdrinier type paper machine, dewatered, pressed, dried at 150 ℃, and wound to produce dry aramid paper.
[ example 1]
The dry aramid paper was crushed by a shredder, and aramid paper passing through a sieve having an opening with a diameter of 30mm was prepared. The aramid Paper passed through the sieve in an amount of 3 parts by mass and water in an amount of 97 parts by mass were charged into an Intensa pulp (manufactured by IHI volume Paper Technology) shown in FIG. 1, and were disintegrated at a temperature of 50 ℃ for 40 minutes to obtain heat-resistant pulp. The degree of dissociation of the heat-resistant pulp was 45%. The obtained heat-resistant pulp was diluted to a concentration of 1.0% and passed through a refiner (manufactured by kusho processor industries, ltd., disc refiner) at a flow rate of 50L/min and at minimum intervals, without clogging. The pulp was weighed again so that the heat-resistant pulp after the refiner treatment had a basis weight of 40g/m 2 And put into a TAPPY type manual paper making machine (cross-sectional area is 625 cm) 2 ) In this case, a sheet-like article can be produced and the paper-making property is good.
[ example 2]
The dry aramid paper was crushed by a shredder, and aramid paper passing through a sieve having an opening with a diameter of 50mm was prepared. Heat-resistant pulp was obtained in the same manner as in example 1, except that aramid paper passed through the screen was used. The degree of dissociation of the heat-resistant pulp was 44%. When the obtained heat-resistant pulp was passed through a refiner in the same manner as in example 1, the raw material passed through without clogging. When the heat-resistant pulp after the refiner treatment was fed to a TAPPY type manual paper machine in the same manner as in example 1, a sheet-like product could be produced and the paper-making property was also good.
[ example 3]
A heat-resistant pulp was obtained in the same manner as in example 1, except that the dry aramid paper was rolled to a width of 1m, continuously fed while rotating an Intensa pulp pre-filled with warm water at 50 ℃. The degree of dissociation of the heat-resistant pulp was 48%. When the obtained heat-resistant pulp was passed through a refiner in the same manner as in example 1, the raw material passed through without clogging. When the heat-resistant pulp after the refiner treatment was further fed to a TAPPY type manual paper machine in the same manner as in example 1, a sheet-like product could be produced and the paper-making property was also good.
[ example 4]
The dry aramid paper was pulverized with a shredder, and aramid paper passed through a sieve having an opening diameter of 30mm was prepared. A heat-resistant pulp was obtained in the same manner as in example 1, except that 4.5 parts by mass of the aramid paper passed through the sieve and 95.5 parts by mass of water were charged into the intense pulp. The degree of dissociation of the heat-resistant pulp was 47%. When the obtained heat-resistant pulp was passed through a refiner in the same manner as in example 1, the raw material passed through without clogging. When the heat-resistant pulp after the refiner treatment was further fed to a TAPPY type manual paper machine in the same manner as in example 1, a sheet-like product could be produced and the paper-making property was also good.
Comparative example 1
In the same operation as in example 1 except that a low-consistency Pulper (hydrapulper) was used instead of using the Intensa pulp, stirring was performed in a state where most of the aramid paper floated on the water surface in the disintegration step. The degree of dissociation of the resulting heat-resistant pulp was 17%. When the obtained heat-resistant pulp was sufficiently stirred and passed through a refiner in the same manner as in example 1 with undissociated paper pieces remaining, clogging occurred in the middle of the process, and the refiner treatment was not performed.
Comparative example 2
The disintegration was performed in the same manner as in example 1, except that the dried aramid paper was kneaded and ground in a pelletizer having a screen with an opening diameter of about 8mm (5/16 inches), and 6 parts by mass of the pelletized aramid paper and 94 parts by mass of water were charged into a low-consistency pulper (hydropulper). At the time of charging, since a part of the pelletized aramid paper is scattered and attached to the upper side of the pulper, it is necessary to discharge water after each small amount of charging, and the charging while dissolving water with the aramid paper requires time for drying the charging of the aramid paper. In the dissociation step, the aramid paper was stirred in a state in which a part of the aramid paper floated on the water surface, and the dissociation degree of the obtained heat-resistant pulp was 25%. When the obtained heat-resistant pulp was passed through a refiner in the same manner as in example 1, the raw material passed through without clogging although a load was applied. When the heat-resistant pulp after the refiner treatment was fed to a TAPPY type manual paper machine in the same manner as in example 1, the end of the sheet was broken at the time of lifting, and the paper-making property was slightly poor.
From the above, it can be seen that: by using the method for producing heat-resistant pulp of the present example (examples 1 to 4), the aramid paper can be uniformly disintegrated without any omission without cutting the aramid paper in advance to be thin, and as a result, the aramid paper can be reused as a raw material for paper making.
Description of the symbols
1: a dissociator;
2: a motor;
4: a rotor;
6: a trough body;
6A: a bottom surface;
6B: a side wall;
8: a foot member;
10: and a baffle plate.
Claims (6)
1. A method for producing pulp, characterized by: which is a method for producing pulp for dissociating aramid paper comprising aramid staple fibers and aramid fibrids in water,
wherein the method comprises a dissociation step of putting dry aramid paper into water and dissociating the aramid paper,
in the dissociation step, the aramid paper is dissociated in water using a dissociator configured to generate a vertical stirring force.
2. The method for producing pulp according to claim 1, wherein the aramid paper put into the water in the dissociation step includes a paper piece having a maximum size exceeding 12.7 mm.
3. The method for producing pulp according to claim 1 or 2, wherein the aramid paper to be put into water at the time of dissociation comprises a paper sheet having a maximum size of 50mm or more.
4. The method for producing pulp according to any one of claims 1 to 3, wherein the aramid paper to be put into water at the time of dissociation has a continuous sheet shape.
5. The method for producing pulp according to any one of claims 1 to 4, further comprising a wet refining step of subjecting the aramid paper to wet refining after the dissociation step.
6. The manufacturing method of the regenerated aramid paper is characterized by comprising the following steps: a papermaking process comprising subjecting the pulp obtained by the method for producing pulp according to any one of claims 1 to 5 to papermaking.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2020-027845 | 2020-02-21 | ||
| JP2020027845A JP2021130892A (en) | 2020-02-21 | 2020-02-21 | Method for producing paper pulp and method for producing regenerated aramid paper |
| PCT/JP2020/049093 WO2021166462A1 (en) | 2020-02-21 | 2020-12-28 | Method for producing paper pulp and method for producing recycled aramid paper |
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| CN115087777A true CN115087777A (en) | 2022-09-20 |
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| CN202080097143.2A Pending CN115087777A (en) | 2020-02-21 | 2020-12-28 | Method for producing pulp and method for producing recycled aramid paper |
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| Country | Link |
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| JP (1) | JP2021130892A (en) |
| KR (1) | KR20220113827A (en) |
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| WO (1) | WO2021166462A1 (en) |
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| US5026456A (en) | 1990-06-14 | 1991-06-25 | E. I. Du Pont De Nemours And Company | Aramid papers containing aramid paper pulp |
| JP3340549B2 (en) * | 1994-03-01 | 2002-11-05 | 帝人株式会社 | Method for producing porous aramid molding |
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2020
- 2020-02-21 JP JP2020027845A patent/JP2021130892A/en active Pending
- 2020-12-28 CN CN202080097143.2A patent/CN115087777A/en active Pending
- 2020-12-28 KR KR1020227025911A patent/KR20220113827A/en unknown
- 2020-12-28 WO PCT/JP2020/049093 patent/WO2021166462A1/en active Application Filing
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| JP2003213592A (en) * | 2002-01-18 | 2003-07-30 | Oji Paper Co Ltd | Method for producing nonwoven fabric for laminate and the resultant nonwoven fabric |
| KR20070109342A (en) * | 2006-05-11 | 2007-11-15 | 주식회사 코오롱 | Method of manufacturing armid pulp |
| JP2008150734A (en) * | 2006-12-15 | 2008-07-03 | Voith Patent Gmbh | Waste paper dissolution apparatus |
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| KR20220113827A (en) | 2022-08-16 |
| WO2021166462A1 (en) | 2021-08-26 |
| JP2021130892A (en) | 2021-09-09 |
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