CN114606770A - Processing method for improving spinnability of carboxymethyl cellulose fiber - Google Patents
Processing method for improving spinnability of carboxymethyl cellulose fiber Download PDFInfo
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- CN114606770A CN114606770A CN202210279627.XA CN202210279627A CN114606770A CN 114606770 A CN114606770 A CN 114606770A CN 202210279627 A CN202210279627 A CN 202210279627A CN 114606770 A CN114606770 A CN 114606770A
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- Prior art keywords
- cellulose fiber
- carboxymethyl cellulose
- fiber
- etherification
- solution
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- 239000000835 fiber Substances 0.000 title claims abstract description 194
- 229920002134 Carboxymethyl cellulose Polymers 0.000 title claims abstract description 150
- 239000001768 carboxy methyl cellulose Substances 0.000 title claims abstract description 150
- 235000010948 carboxy methyl cellulose Nutrition 0.000 title claims abstract description 149
- 239000008112 carboxymethyl-cellulose Substances 0.000 title claims abstract description 149
- 238000003672 processing method Methods 0.000 title claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000006266 etherification reaction Methods 0.000 claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 238000009990 desizing Methods 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 67
- 229920003043 Cellulose fiber Polymers 0.000 claims description 56
- 239000000243 solution Substances 0.000 claims description 49
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 230000003113 alkalizing effect Effects 0.000 claims description 22
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 22
- 239000004745 nonwoven fabric Substances 0.000 claims description 18
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 claims description 16
- 229940106681 chloroacetic acid Drugs 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 16
- 238000009960 carding Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- CBECDWUDYQOTSW-UHFFFAOYSA-N 2-ethylbut-3-enal Chemical compound CCC(C=C)C=O CBECDWUDYQOTSW-UHFFFAOYSA-N 0.000 claims description 3
- JTHNLKXLWOXOQK-UHFFFAOYSA-N n-propyl vinyl ketone Natural products CCCC(=O)C=C JTHNLKXLWOXOQK-UHFFFAOYSA-N 0.000 claims description 2
- 239000012744 reinforcing agent Substances 0.000 claims 1
- 238000006467 substitution reaction Methods 0.000 abstract description 11
- 230000001681 protective effect Effects 0.000 abstract description 10
- 239000002994 raw material Substances 0.000 abstract description 7
- 239000004753 textile Substances 0.000 abstract description 5
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 238000009987 spinning Methods 0.000 abstract description 2
- 230000000704 physical effect Effects 0.000 description 20
- 230000003014 reinforcing effect Effects 0.000 description 20
- 239000004372 Polyvinyl alcohol Substances 0.000 description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 description 14
- 239000012043 crude product Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 235000019441 ethanol Nutrition 0.000 description 10
- 230000007547 defect Effects 0.000 description 9
- 238000004513 sizing Methods 0.000 description 9
- DHKHKXVYLBGOIT-UHFFFAOYSA-N acetaldehyde Diethyl Acetal Natural products CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 7
- -1 butyraldehyde acetal Chemical class 0.000 description 7
- ZTQSAGDEMFDKMZ-UHFFFAOYSA-N butyric aldehyde Natural products CCCC=O ZTQSAGDEMFDKMZ-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 150000002148 esters Chemical class 0.000 description 7
- 150000002576 ketones Chemical class 0.000 description 7
- 239000003960 organic solvent Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- HGBOYTHUEUWSSQ-UHFFFAOYSA-N valeric aldehyde Natural products CCCCC=O HGBOYTHUEUWSSQ-UHFFFAOYSA-N 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000002411 adverse Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 206010052428 Wound Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 238000010669 acid-base reaction Methods 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- TVACALAUIQMRDF-UHFFFAOYSA-N dodecyl dihydrogen phosphate Chemical compound CCCCCCCCCCCCOP(O)(O)=O TVACALAUIQMRDF-UHFFFAOYSA-N 0.000 description 2
- 210000000416 exudates and transudate Anatomy 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- CTKXFMQHOOWWEB-UHFFFAOYSA-N Ethylene oxide/propylene oxide copolymer Chemical compound CCCOC(C)COCCO CTKXFMQHOOWWEB-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920001213 Polysorbate 20 Polymers 0.000 description 1
- 229920001214 Polysorbate 60 Polymers 0.000 description 1
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 description 1
- JNGWKQJZIUZUPR-UHFFFAOYSA-N [3-(dodecanoylamino)propyl](hydroxy)dimethylammonium Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)[O-] JNGWKQJZIUZUPR-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 229940026210 lauramidopropylamine oxide Drugs 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920001993 poloxamer 188 Polymers 0.000 description 1
- 229940044519 poloxamer 188 Drugs 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 description 1
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 1
- 229920000053 polysorbate 80 Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/347—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated ethers, acetals, hemiacetals, ketones or aldehydes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/28—Polysaccharides or their derivatives
-
- 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
- D04H1/425—Cellulose series
- D04H1/4258—Regenerated cellulose series
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/184—Carboxylic acids; Anhydrides, halides or salts thereof
- D06M13/207—Substituted carboxylic acids, e.g. by hydroxy or keto groups; Anhydrides, halides or salts thereof
- D06M13/21—Halogenated carboxylic acids; Anhydrides, halides or salts thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Materials Engineering (AREA)
- Hematology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention provides a treatment method for improving spinnability of carboxymethyl cellulose fiber, which comprises alkalization, etherification, drying and desizing. The fiber-reinforced treatment agent is attached to the carboxymethyl cellulose fiber to form a layer of protective film by utilizing the existing process for modifying the carboxymethyl cellulose fiber, so that the aims of improving the breaking strength and the breaking elongation are fulfilled, and after the spinning is finished, the fiber-reinforced treatment agent on the textile product is removed by using alcohol, so that the single textile products such as medical dressings and the like taking the carboxymethyl cellulose fiber as the raw material are realized, the operation is simple, and the method is suitable for large-scale production. The carboxymethyl cellulose fiber prepared by the invention has the advantages of 0.6-0.85 degree of substitution, 2.11-2.45cN/dtex dry breaking strength, 0.83-1.05cN/dtex wet breaking strength, 6.0-6.6% dry breaking elongation, excellent mechanical property and difficult breakage in the textile processing process.
Description
Technical Field
The invention belongs to the technical field of carboxymethyl cellulose fiber, and particularly relates to a processing method for improving the spinnability of carboxymethyl cellulose fiber.
Background
Carboxymethyl cellulose (CMC) is a main raw material for preparing medical dressings, carboxymethyl cellulose fiber is used as a raw material, the medical dressings prepared by weaving have high water absorption, can quickly form gel after absorbing exudates, and can not only maintain the moist environment of wounds and promote healing. In addition, the medical dressing prepared by taking the carboxymethyl cellulose fiber as the raw material has good biocompatibility with human bodies.
When the substitution degree of the carboxymethyl cellulose fiber is 0.60-0.80, the liquid absorption capacity is 76.09g.g, the liquid retention capacity is 55.12g, and the liquid absorption performance is excellent. However, although carboxymethyl cellulose fiber has excellent performance of absorbing exudate from a wound surface, the carboxymethyl cellulose fiber has poor mechanical properties, and particularly, the fiber has poor breaking strength and low breaking elongation. Due to the adverse effects of poor breaking strength and low breaking elongation, the carboxymethyl cellulose fiber is very easy to break during processing of cotton carding, non-woven, spinning, weaving and other processes, so that the processing cannot be normally carried out, the processing cost is increased, and the waste of resources is caused.
The patent number "CN 201210566478.1" entitled "high-strength and high-water-absorption medical dressing containing carboxymethyl cellulose and preparation method thereof" provides a method for improving the mechanical strength of carboxymethyl cellulose medical dressing, and cellulose non-woven fabric is combined with other non-woven fabrics by a needle punching mode so as to improve the dry and wet strength of the medical dressing. However, this method does not solve the problem of low strength of carboxymethyl cellulose fiber.
The patent number "CN 201810716048.0" is named as "medical hydrophilic fiber dressing" and provides a sodium carboxymethylcellulose fiber with high fiber strength and a preparation method thereof, Tween 80, Tween 60, Tween 20, monolauryl phosphate, dodecyl phosphate, lauryl alcohol ether phosphate, fatty alcohol polyoxyethylene ether, lauramidopropyl amine oxide, span 80, poloxamer 188 and the like are used as auxiliary agents, but the method has more types of auxiliary agents, the prepared carboxymethyl cellulose fiber needs to be cleaned for many times, and the process is very complicated.
Disclosure of Invention
The invention provides a processing method for improving the spinnability of carboxymethyl cellulose fiber, which aims to solve the problems in the prior art and improve the spinnability of the carboxymethyl cellulose fiber.
In order to solve the technical problems, the invention adopts the following technical scheme:
a treatment method for improving the spinnability of carboxymethyl cellulose fiber comprises the following steps:
s1 alkalization
Adding cellulose fiber into the alkalizing liquid, heating to 57-63 deg.C, and reacting for 40-50 min.
Preferably, the alkalizing solution is a mixed solution of sodium hydroxide, anhydrous ethanol and water; the mass ratio of the sodium hydroxide to the absolute ethyl alcohol to the water is 160-170:850: 25.
Preferably, the addition amount of the cellulose fiber is 38-42% of the alkalizing liquid.
Preferably, the titer of the cellulose fiber is 1.0-3.0dtex, and the length is 2-10 cm.
S2, etherification
Adding the etherifying liquid into the mixture of the alkalized cellulose fiber and the alkalizing liquid, heating to 62-68 ℃, and reacting for 30-40min to obtain a crude product of the carboxymethyl cellulose fiber.
Preferably, the addition amount of the etherification solution is 30-35% of the cellulose fiber.
Further, the etherification solution is a mixed solution of chloroacetic acid and absolute ethyl alcohol; the mass ratio of the chloroacetic acid to the absolute ethyl alcohol is 17-20: 10.
Preferably, a fiber-reinforcing treatment agent is added to the alkalizing liquid of S1 or the etherification liquid of S2.
More preferably, a fiber-reinforcing treating agent is added to the etherification solution of S2.
Further, the fiber reinforcement treating agent is polyvinyl butyral, wherein the vinyl butyral group (m/m) is 68.0-80.0%, and can be completely dissolved in ethanol, and the polyvinyl butyral is approximately saturated when the effective content of the polyvinyl butyral exceeds 82% and cannot be completely dissolved in ethanol.
Preferably, the addition amount of the fiber reinforcement treating agent in the S1 alkalizing liquid is 2-2.5% of the cellulose fiber.
Preferably, the addition amount of the fiber reinforcement treating agent in the S2 etherification solution is 1.9-2.3% of the cellulose fiber.
Polyvinyl butyral is a solvent-based resin synthesized by the reaction of polyvinyl alcohol (PVA) and butyraldehyde acetal, also called pvb, is insoluble in water and soluble in organic solvents such as alcohol, ketone, ester and the like. The pvc has good water resistance and anti-blocking performance, and is used as a fiber reinforcing treating agent in the invention, and the fiber reinforcing treating agent is uniformly dispersed in the alkalization liquid or the etherification liquid, and is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and a layer of protective film is formed on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The high physical property of the fiber reinforced treating agent makes up the defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber, thereby greatly improving the physical property of the carboxymethyl cellulose fiber.
Preferably, a fiber-reinforcing treating agent is added to the etherification solution at the etherification stage. The polyvinyl butyral added during the alkalization step, after forming a film on the surface of the carboxymethyl cellulose fiber, is adversely affected by the subsequent acid-base reaction, resulting in lower physical properties of the final fiber relative to that added during the etherification step.
With the continuous alkalization or etherification, the absolute ethyl alcohol in the alkalization liquid or the etherification liquid is gradually evaporated and recovered, and the pvb is firmly adhered and bonded on the surface of the carboxymethyl cellulose fiber.
S3, drying
And (3) feeding the crude product of the carboxymethyl cellulose fiber into a dryer to be dried for 2-3h at the temperature of 65-70 ℃ to obtain the carboxymethyl cellulose fiber.
S4 desizing
Through the processes of opening, carding, needling and the like, the carboxymethyl cellulose fiber is made into non-woven fabric, the pvb is removed through a desizing tank, and the medical dressing is obtained through slitting after rolling.
Preferably, the solution in the desizing tank is absolute ethyl alcohol; the ratio of the non-woven fabric to the absolute ethyl alcohol is 1: 5-10.
When the carboxymethyl cellulose fiber enters the desizing tank, the pvc film on the surface of the carboxymethyl cellulose fiber is diluted in absolute ethanol, and when the ratio of the pvc to the absolute ethanol is lower than 1: at 60, the pvb can be completely dissolved in absolute ethanol, i.e.removed.
Due to the adoption of the technical scheme, the invention achieves the technical effects that:
1. the carboxymethyl cellulose fiber prepared by the invention has the advantages of 0.6-0.85 degree of substitution, 2.11-2.45cN/dtex dry breaking strength, 0.83-1.05cN/dtex wet breaking strength, 6.0-6.6% dry breaking elongation, excellent mechanical property and difficult breakage in the textile processing process.
2. The carboxymethyl treatment is carried out by taking cellulose fiber as a raw material, and in the alkalization or etherification step, polyvinyl butyral is added into the alkalization liquid or the etherification liquid as a fiber-reinforced treating agent to form a layer of pvc film on the surface of the fiber, so that the physical and mechanical properties of the carboxymethyl cellulose fiber are enhanced, the spinnability is improved, and the carboxymethyl cellulose fiber can be removed by desizing subsequently, and the operation is simple and suitable for large-scale production.
3. The PVC has good water resistance and anti-blocking property, is used as a fiber reinforcing treatment agent in the invention, is uniformly dispersed in the alkalization liquid or the etherification liquid, and is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and a layer of protective film is formed on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The high physical property of the fiber reinforced treating agent makes up the defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber, thereby greatly improving the physical property of the carboxymethyl cellulose fiber.
4. The polyvinyl butyral adopted by the invention has 68.0-80.0% of vinyl butyral (m/m) which can be completely dissolved in ethanol.
5. The fiber-reinforced treating agent of the present invention may be added in the step of alkalization or etherification, and preferably the fiber-reinforced treating agent is added to the etherification solution in the stage of etherification. The polyvinyl butyral added during the alkalization step, after forming a film on the surface of the carboxymethyl cellulose fiber, is adversely affected by the subsequent acid-base reaction, resulting in lower physical properties of the final fiber relative to that added during the etherification step.
6. With the continuous alkalization or etherification step, the absolute ethyl alcohol in the alkalization liquid or the etherification liquid is gradually evaporated and recovered, and the pvb is firmly adhered and bonded on the surface of the carboxymethyl cellulose fiber; when the carboxymethyl cellulose fiber enters the desizing tank, the pvc film on the surface of the carboxymethyl cellulose fiber is diluted in absolute ethanol, and when the ratio of the pvc to the absolute ethanol is lower than 1: at 60 hours, the pvb can be completely dissolved in the absolute ethyl alcohol, namely, the pvb is removed, so that any influence on the liquid absorption and retention performance of the medical dressing is avoided, and single textile products such as the medical dressing and the like taking the carboxymethyl cellulose fiber as the raw material are realized.
Detailed Description
The invention is further illustrated below with reference to specific examples.
Example 1 a treatment process for improving the spinnability of carboxymethylcellulose fibers comprising the steps of:
s1 alkalization
Adding cellulose fiber into the alkalizing liquid, heating to 60 ℃, and reacting for 40 min.
The alkalization solution is a mixed solution of sodium hydroxide, absolute ethyl alcohol and water; the mass ratio of the sodium hydroxide to the absolute ethyl alcohol to the water is 165:850: 25.
The addition amount of the cellulose fiber is 40 percent of the alkalizing liquid.
The titer of the cellulose fiber is 1.6dtex, and the length of the cellulose fiber is 3.8 cm.
Adding a fiber reinforcing treatment agent into the alkalized liquid; the fiber-reinforced treating agent is polyvinyl butyral, and the addition amount of the fiber-reinforced treating agent is 2.35% of that of the cellulose fiber.
S2, etherification
And adding the etherifying liquid into the mixture of the alkalized cellulose fibers and the alkalizing liquid, heating to 65 ℃, and reacting for 30min to obtain a crude product of the carboxymethyl cellulose fibers.
The addition amount of the etherification solution is 33 percent of that of the cellulose fiber.
The etherification solution is a mixed solution of chloroacetic acid and absolute ethyl alcohol; the mass ratio of the chloroacetic acid to the absolute ethyl alcohol is 18: 10.
Polyvinyl butyral is a solvent-based resin synthesized by the reaction of polyvinyl alcohol (PVA) and butyraldehyde acetal, also called pvb, which is insoluble in water and soluble in organic solvents such as alcohol, ketone, ester, etc. The pvc has good water resistance and anti-blocking performance, and is used as a fiber reinforcing treating agent in the invention, and the fiber reinforcing treating agent is uniformly dispersed in the alkalization liquid or the etherification liquid, and is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and a layer of protective film is formed on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The high physical property of the fiber reinforced treating agent makes up the defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber, thereby greatly improving the physical property of the carboxymethyl cellulose fiber.
With the continuous alkalization step, the absolute ethyl alcohol in the alkalization solution is gradually evaporated and recovered, and the pvb is firmly adhered and bonded on the surface of the carboxymethyl cellulose fiber.
S3, drying
And (3) feeding the crude product of the carboxymethyl cellulose fiber into a dryer to be dried for 3 hours at 65 ℃ to obtain the carboxymethyl cellulose fiber.
S4 desizing
Through the processes of opening, carding, needling and the like, the carboxymethyl cellulose fiber is made into non-woven fabric, the pvb is removed through a desizing tank, and the medical dressing is obtained through slitting after rolling.
Preferably, the solution in the desizing tank is absolute ethyl alcohol; the ratio of the non-woven fabric to the absolute ethyl alcohol is 1: 8.
When the carboxymethyl cellulose fiber enters the desizing tank, the pvc film on the surface of the carboxymethyl cellulose fiber is diluted in the absolute ethyl alcohol, completely dissolved in the absolute ethyl alcohol, and the pvc is removed.
The carboxymethyl cellulose fiber prepared in example 1 was used, and had a degree of substitution of 0.81, a dry breaking strength of 2.2cN/dtex, a wet breaking strength of 1.05cN/dtex, and a dry elongation at break of 6.5%.
Example 2 a treatment process for improving the spinnability of carboxymethylcellulose fibers comprising the steps of:
s1 alkalization
Adding cellulose fiber into the alkalizing liquid, heating to 57 ℃, and reacting for 50 min.
The alkalization solution is a mixed solution of sodium hydroxide, absolute ethyl alcohol and water; the mass ratio of the sodium hydroxide to the absolute ethyl alcohol to the water is 160:850: 25.
The addition amount of the cellulose fiber is 38 percent of the alkalization liquid.
The titer of the cellulose fiber is 1.0dtex, and the length of the cellulose fiber is 2 cm.
Adding a fiber reinforcing treatment agent into the alkalized liquid; the fiber-reinforced treating agent is polyvinyl butyral, and the addition amount of the fiber-reinforced treating agent is 2% of that of the cellulose fiber.
S2, etherification
And adding the etherifying liquid into the mixture of the alkalized cellulose fibers and the alkalizing liquid, heating to 62 ℃, and reacting for 40min to obtain a crude product of the carboxymethyl cellulose fibers.
The addition amount of the etherification solution is 30 percent of that of the cellulose fiber.
The etherification solution is a mixed solution of chloroacetic acid and absolute ethyl alcohol; the mass ratio of the chloroacetic acid to the absolute ethyl alcohol is 17: 10.
Polyvinyl butyral is a solvent-based resin synthesized by the reaction of polyvinyl alcohol (PVA) and butyraldehyde acetal, also called pvb, which is insoluble in water and soluble in organic solvents such as alcohol, ketone, ester, etc. The pvc has good water resistance and anti-blocking performance, and is used as a fiber reinforcing treating agent in the invention, and the fiber reinforcing treating agent is uniformly dispersed in the alkalization liquid or the etherification liquid, and is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and a layer of protective film is formed on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The high physical property of the fiber reinforced treating agent makes up the defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber, thereby greatly improving the physical property of the carboxymethyl cellulose fiber.
With the continuous alkalization step, the absolute ethyl alcohol in the alkalization solution is gradually evaporated and recovered, and the pvb is firmly adhered and bonded on the surface of the carboxymethyl cellulose fiber.
S3, drying
And (3) feeding the crude product of the carboxymethyl cellulose fiber into a dryer to be dried for 2 hours at the temperature of 70 ℃ to obtain the carboxymethyl cellulose fiber.
S4 desizing
Through the processes of opening, carding, needling and the like, the carboxymethyl cellulose fiber is made into non-woven fabric, the pvb is removed through a desizing tank, and the medical dressing is obtained through slitting after rolling.
Preferably, the solution in the desizing tank is absolute ethyl alcohol; the ratio of the non-woven fabric to the absolute ethyl alcohol is 1: 5.
When the carboxymethyl cellulose fiber enters the desizing tank, the pvc film on the surface of the carboxymethyl cellulose fiber is diluted in the absolute ethyl alcohol, completely dissolved in the absolute ethyl alcohol, and the pvc is removed.
The carboxymethyl cellulose fiber prepared in example 2 was used, and had a degree of substitution of 0.6, a dry breaking strength of 2.11cN/dtex, a wet breaking strength of 0.98cN/dtex, and a dry elongation at break of 6.6%.
Example 3 a treatment process for improving the spinnability of carboxymethylcellulose fibers comprising the steps of:
s1 alkalization
Adding the cellulose fiber into the alkalization liquid, heating to 63 ℃, and reacting for 45 min.
The alkalization solution is a mixed solution of sodium hydroxide, absolute ethyl alcohol and water; the mass ratio of the sodium hydroxide to the absolute ethyl alcohol to the water is 170:850: 25.
The addition amount of the cellulose fiber is 42 percent of the alkalizing liquid.
The titer of the cellulose fiber is 3.0dtex, and the length of the cellulose fiber is 5 cm.
Adding a fiber reinforcing treatment agent into the alkalized liquid; the fiber-reinforced treating agent is polyvinyl butyral, and the addition amount of the fiber-reinforced treating agent is 2.5% of the addition amount of the cellulose fiber.
S2, etherification
And adding the etherifying liquid into the mixture of the alkalized cellulose fibers and the alkalizing liquid, heating to 68 ℃, and reacting for 35min to obtain a crude carboxymethyl cellulose fiber product.
The addition amount of the etherification solution is 35 percent of that of the cellulose fiber.
The etherification solution is a mixed solution of chloroacetic acid and absolute ethyl alcohol; the mass ratio of the chloroacetic acid to the absolute ethyl alcohol is 20: 10.
Polyvinyl butyral is a solvent-based resin synthesized by the reaction of polyvinyl alcohol (PVA) and butyraldehyde acetal, also called pvb, which is insoluble in water and soluble in organic solvents such as alcohol, ketone, ester, etc. The pvc has good water resistance and anti-blocking performance, and is used as a fiber reinforcing treating agent in the invention, and the fiber reinforcing treating agent is uniformly dispersed in the alkalization liquid or the etherification liquid, and is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and a layer of protective film is formed on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber are overcome by the higher physical property of the fiber-reinforced treating agent, so that the physical property of the carboxymethyl cellulose fiber is greatly improved.
With the continuous alkalization step, the absolute ethyl alcohol in the alkalization solution is gradually evaporated and recovered, and the pvb is firmly adhered and bonded on the surface of the carboxymethyl cellulose fiber.
S3, drying
And (3) feeding the crude product of the carboxymethyl cellulose fiber into a dryer to be dried for 3 hours at 65 ℃ to obtain the carboxymethyl cellulose fiber.
S4 desizing
Through the processes of opening, carding, needling and the like, the carboxymethyl cellulose fiber is made into non-woven fabric, the pvb is removed through a desizing tank, and the medical dressing is obtained through slitting after rolling.
Preferably, the solution in the desizing tank is absolute ethyl alcohol; the ratio of the non-woven fabric to the absolute ethyl alcohol is 1: 10.
When the carboxymethyl cellulose fiber enters the desizing tank, the pvc film on the surface of the carboxymethyl cellulose fiber is diluted in the absolute ethyl alcohol, completely dissolved in the absolute ethyl alcohol, and the pvc is removed.
The carboxymethyl cellulose fiber prepared in example 3 was used, and had a degree of substitution of 0.69, a dry breaking strength of 2.18cN/dtex, a wet breaking strength of 1.02cN/dtex, and a dry elongation at break of 6.52%.
Example 4 a treatment process for improving the spinnability of carboxymethylcellulose fibers comprising the steps of:
s1 alkalization
Adding cellulose fiber into the alkalizing liquid, heating to 60 ℃, and reacting for 40 min.
The alkalization solution is a mixed solution of sodium hydroxide, absolute ethyl alcohol and water; the mass ratio of the sodium hydroxide to the absolute ethyl alcohol to the water is 165:850: 25.
The addition amount of the cellulose fiber is 40 percent of the alkalizing liquid.
The titer of the cellulose fiber is 1.6dtex, and the length of the cellulose fiber is 3.8 cm.
S2, etherification
And adding the etherifying liquid into the mixture of the alkalized cellulose fibers and the alkalizing liquid, heating to 65 ℃, and reacting for 30min to obtain a crude product of the carboxymethyl cellulose fibers.
The addition amount of the etherification solution is 33 percent of that of the cellulose fiber.
The etherification solution is a mixed solution of chloroacetic acid and absolute ethyl alcohol; the mass ratio of the chloroacetic acid to the absolute ethyl alcohol is 18: 10.
Adding a fiber reinforced treating agent into the etherification solution; the fiber-reinforced treating agent is polyvinyl butyral, and the addition amount of the fiber-reinforced treating agent is 2.1% of the cellulose fiber.
Polyvinyl butyral is a solvent-based resin synthesized by the reaction of polyvinyl alcohol (PVA) and butyraldehyde acetal, also called pvb, which is insoluble in water and soluble in organic solvents such as alcohol, ketone, ester, etc. The PVC has good water resistance and anti-blocking property, is used as a fiber reinforcing treatment agent in the invention, is uniformly dispersed in the alkalization liquid or the etherification liquid, and is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and a layer of protective film is formed on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The high physical property of the fiber reinforced treating agent makes up the defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber, thereby greatly improving the physical property of the carboxymethyl cellulose fiber.
With the continuous alkalization or etherification, the absolute ethyl alcohol in the alkalization liquid or the etherification liquid is gradually evaporated and recovered, and the pvb is firmly adhered and bonded on the surface of the carboxymethyl cellulose fiber.
S3, drying
And (3) feeding the crude product of the carboxymethyl cellulose fiber into a dryer to be dried for 3 hours at 65 ℃ to obtain the carboxymethyl cellulose fiber.
S4 desizing
Through the processes of opening, carding, needling and the like, the carboxymethyl cellulose fiber is made into non-woven fabric, the pvb is removed through a desizing tank, and the medical dressing is obtained through slitting after rolling.
Preferably, the solution in the desizing tank is absolute ethyl alcohol; the ratio of the non-woven fabric to the absolute ethyl alcohol is 1: 8.
When the carboxymethyl cellulose fiber enters the desizing tank, the pvc film on the surface of the carboxymethyl cellulose fiber is diluted in the absolute ethyl alcohol, completely dissolved in the absolute ethyl alcohol, and the pvc is removed.
The carboxymethyl cellulose fiber prepared in example 1 was used, and had a degree of substitution of 0.85, a dry breaking strength of 2.45cN/dtex, a wet breaking strength of 0.92cN/dtex, and a dry elongation at break of 6.0%.
Example 5 a treatment process for improving the spinnability of carboxymethylcellulose fibers comprising the steps of:
adding cellulose fiber into the alkalizing liquid, heating to 57 ℃, and reacting for 50 min.
The alkalization solution is a mixed solution of sodium hydroxide, absolute ethyl alcohol and water; the mass ratio of the sodium hydroxide to the absolute ethyl alcohol to the water is 160:850: 25.
The addition amount of the cellulose fiber is 38 percent of the alkalizing liquid.
The titer of the cellulose fiber is 2.0dtex, and the length of the cellulose fiber is 10 cm.
S2, etherification
And adding the etherifying liquid into the mixture of the alkalized cellulose fibers and the alkalizing liquid, heating to 62 ℃, and reacting for 40min to obtain a crude product of the carboxymethyl cellulose fibers.
The addition amount of the etherification solution is 30 percent of that of the cellulose fiber.
The etherification solution is a mixed solution of chloroacetic acid and absolute ethyl alcohol; the mass ratio of the chloroacetic acid to the absolute ethyl alcohol is 17: 10.
Adding a fiber reinforcing treatment agent into the etherification solution; the fiber-reinforced treating agent is polyvinyl butyral, and the addition amount of the fiber-reinforced treating agent is 1.9% of the cellulose fiber.
Polyvinyl butyral is a solvent-based resin synthesized by the reaction of polyvinyl alcohol (PVA) and butyraldehyde acetal, also called pvb, is insoluble in water and soluble in organic solvents such as alcohol, ketone, ester and the like. The pvc has good water resistance and anti-blocking performance, and is used as a fiber reinforcing treating agent in the invention, and the fiber reinforcing treating agent is uniformly dispersed in the alkalization liquid or the etherification liquid, and is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and a layer of protective film is formed on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber are overcome by the higher physical property of the fiber-reinforced treating agent, so that the physical property of the carboxymethyl cellulose fiber is greatly improved.
With the continuous alkalization or etherification, the absolute ethyl alcohol in the alkalization liquid or the etherification liquid is gradually evaporated and recovered, and the pvb is firmly adhered and bonded on the surface of the carboxymethyl cellulose fiber.
S3, drying
And (3) feeding the crude product of the carboxymethyl cellulose fiber into a dryer to be dried for 2 hours at the temperature of 70 ℃ to obtain the carboxymethyl cellulose fiber.
S4 desizing
Through the processes of opening, carding, needling and the like, the carboxymethyl cellulose fiber is made into non-woven fabric, the pvb is removed through a desizing tank, and the medical dressing is obtained through slitting after rolling.
Preferably, the solution in the desizing tank is absolute ethyl alcohol; the ratio of the non-woven fabric to the absolute ethyl alcohol is 1: 5.
When the carboxymethyl cellulose fiber enters the desizing tank, the pvc film on the surface of the carboxymethyl cellulose fiber is diluted in the absolute ethyl alcohol, completely dissolved in the absolute ethyl alcohol, and the pvc is removed.
The carboxymethyl cellulose fiber prepared in example 5 was used, and had a degree of substitution of 0.64, a dry breaking strength of 2.35cN/dtex, a wet breaking strength of 0.83cN/dtex, and a dry elongation at break of 6.22%.
Example 6 a treatment process for improving the spinnability of carboxymethylcellulose fibers comprising the steps of:
adding the cellulose fiber into the alkalization liquid, heating to 63 ℃, and reacting for 45 min.
The alkalization solution is a mixed solution of sodium hydroxide, absolute ethyl alcohol and water; the mass ratio of the sodium hydroxide to the absolute ethyl alcohol to the water is 170:850: 25.
The addition amount of the cellulose fiber is 40 percent of the alkalizing liquid.
The titer of the cellulose fiber is 3.0dtex, and the length of the cellulose fiber is 7 cm.
S2, etherification
And adding the etherification solution into the mixture of the alkalized cellulose fibers and the alkalization solution, heating to 68 ℃, and reacting for 35min to obtain a carboxymethyl cellulose fiber crude product.
The addition amount of the etherification solution is 35 percent of that of the cellulose fiber.
The etherification solution is a mixed solution of chloroacetic acid and absolute ethyl alcohol; the mass ratio of the chloroacetic acid to the absolute ethyl alcohol is 20: 10.
Adding a fiber reinforcing treatment agent into the etherification solution; the fiber-reinforced treating agent is polyvinyl butyral, and the addition amount of the fiber-reinforced treating agent is 2.3% of the cellulose fiber.
Polyvinyl butyral is a solvent-based resin synthesized by the reaction of polyvinyl alcohol (PVA) and butyraldehyde acetal, also called pvb, which is insoluble in water and soluble in organic solvents such as alcohol, ketone, ester, etc. The pvc has good water resistance and anti-blocking performance, and is used as a fiber reinforcing treating agent in the invention, and the fiber reinforcing treating agent is uniformly dispersed in the alkalization liquid or the etherification liquid, and is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and a layer of protective film is formed on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The high physical property of the fiber reinforced treating agent makes up the defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber, thereby greatly improving the physical property of the carboxymethyl cellulose fiber.
With the continuous alkalization or etherification, the absolute ethyl alcohol in the alkalization liquid or the etherification liquid is gradually evaporated and recovered, and the pvb is firmly adhered and bonded on the surface of the carboxymethyl cellulose fiber.
S3, drying
And (3) feeding the crude product of the carboxymethyl cellulose fiber into a dryer to be dried for 3 hours at 65 ℃ to obtain the carboxymethyl cellulose fiber.
S4 desizing
Through the processes of opening, carding, needling and the like, the carboxymethyl cellulose fiber is made into non-woven fabric, the pvb is removed through a desizing tank, and the medical dressing is obtained through slitting after rolling.
Preferably, the solution in the desizing tank is absolute ethyl alcohol; the ratio of the non-woven fabric to the absolute ethyl alcohol is 1: 10.
When the carboxymethyl cellulose fiber enters the desizing tank, the pvc film on the surface of the carboxymethyl cellulose fiber is diluted in the absolute ethyl alcohol, completely dissolved in the absolute ethyl alcohol, and the pvc is removed.
The carboxymethyl cellulose fiber prepared in example 1 was used, and had a degree of substitution of 0.73, a dry breaking strength of 2.42cN/dtex, a wet breaking strength of 0.9cN/dtex, and a dry elongation at break of 6.13%.
Comparative example 1
Representative example 4 was selected, the fiber-reinforcing treating agent was removed, and the rest was the same as example 4, and was used as comparative example 1. The carboxymethyl cellulose fiber prepared in comparative example 1 has a degree of substitution of 0.85, a dry breaking strength of 0.823cN/dtex, a wet breaking strength of 0.51cN/dtex, and a dry elongation at break of 0.7%, and is greatly reduced in mechanical properties and easily broken by opening, carding, needling and other processes.
In the invention, the pvc is used as a fiber reinforcing treating agent, is uniformly dispersed in the alkalization liquid or the etherification liquid, is firmly adhered and bonded to the surface of the carboxymethyl cellulose fiber to achieve the effect of fiber sizing, and forms a protective film on the surface of the carboxymethyl cellulose fiber to wrap the carboxymethyl cellulose fiber. The high physical property of the fiber reinforced treating agent fills the defects of poor breaking strength and low breaking elongation of the carboxymethyl cellulose fiber, so that the physical property of the carboxymethyl cellulose fiber is greatly improved, and the carboxymethyl cellulose fiber can be removed by desizing subsequently, is simple to operate and is suitable for large-scale production.
Unless otherwise specified, the proportions are mass proportions, and the percentages are mass percentages; the raw materials are all purchased from the market.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A treatment method for improving the spinnability of carboxymethyl cellulose fiber is characterized by comprising alkalization, etherification, drying and desizing.
2. The treatment method for improving the spinnability of carboxymethyl cellulose fiber according to claim 1, wherein the alkalization is carried out by adding cellulose fiber into alkalization solution, heating to 57-63 ℃ and reacting for 40-50 min.
3. The treatment method for improving the spinnability of carboxymethyl cellulose fiber according to claim 2, wherein the alkalizing solution is a mixed solution of sodium hydroxide, absolute ethyl alcohol and water;
the mass ratio of the sodium hydroxide to the absolute ethyl alcohol to the water is 160-170:850: 25;
the addition amount of the cellulose fiber is 38-42% of the alkalization liquid.
4. The processing method for improving the spinnability of carboxymethyl cellulose fiber according to claim 1, wherein the etherification comprises the steps of adding an etherification solution into a mixture of alkalized cellulose fiber and the alkalized solution, heating to 62-68 ℃, and reacting for 30-40min to obtain a crude carboxymethyl cellulose fiber;
the addition amount of the etherification solution is 30-35% of the cellulose fiber;
the etherification solution is a mixed solution of chloroacetic acid and absolute ethyl alcohol; the mass ratio of the chloroacetic acid to the absolute ethyl alcohol is 17-20: 10.
5. The method according to claim 4, wherein a fiber-reinforcing treating agent is added to the alkalizing solution or the etherification solution.
6. The method as claimed in claim 5, wherein the fiber-reinforcing agent is polyvinyl butyral; the polyvinyl butyral comprises 68.0-80.0% of vinyl butyral (m/m).
7. The method as claimed in claim 5, wherein the fiber-reinforced treating agent is added in an amount of 2-2.5% based on the cellulose fiber.
8. The method according to claim 5, wherein the fiber-reinforced treating agent is added in an amount of 1.9-2.3% based on the cellulose fiber.
9. The treatment method for improving the spinnability of the carboxymethyl cellulose fiber according to claim 1, wherein the drying is carried out by feeding the crude carboxymethyl cellulose fiber into a dryer for drying at 65-70 ℃ for 2-3h to obtain the carboxymethyl cellulose fiber.
10. The treatment method for improving the spinnability of the carboxymethyl cellulose fiber according to claim 1, characterized in that the carboxymethyl cellulose fiber is made into non-woven fabric through the processes of opening, carding, needling and the like after desizing, then the pvb is removed through a desizing tank, and the medical dressing is obtained through slitting after rolling;
the solution in the desizing tank is absolute ethyl alcohol; the ratio of the non-woven fabric to the absolute ethyl alcohol is 1: 5-10.
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