KR101800085B1 - Moisture superabsorbent composition using solvent type polyurethane and moisture absorbing fiber based textile using the compostion and a method thereof - Google Patents
Moisture superabsorbent composition using solvent type polyurethane and moisture absorbing fiber based textile using the compostion and a method thereof Download PDFInfo
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- KR101800085B1 KR101800085B1 KR1020150159872A KR20150159872A KR101800085B1 KR 101800085 B1 KR101800085 B1 KR 101800085B1 KR 1020150159872 A KR1020150159872 A KR 1020150159872A KR 20150159872 A KR20150159872 A KR 20150159872A KR 101800085 B1 KR101800085 B1 KR 101800085B1
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- 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
- D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
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- 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
- D04H13/00—Other non-woven fabrics
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- 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
- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
- D06M10/003—Treatment with radio-waves or microwaves
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- 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
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2509/00—Medical; Hygiene
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2509/00—Medical; Hygiene
- D10B2509/02—Bandages, dressings or absorbent pads
- D10B2509/026—Absorbent pads; Tampons; Laundry; Towels
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- Textile Engineering (AREA)
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- Biomedical Technology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The present invention relates to a method for producing a fibrous base material, Preparing sodium polyacrylate emulsion by mixing sodium polyacrylate and polyhydric alcohol; And immersing the emulsion in a fibrous substrate immersed in the oil-based polyurethane, and to an absorbent fibrous substrate produced thereby.
Description
The present invention is a method for producing a superabsorbent nonwoven fabric by coating a superabsorbent polymer composition and an oil-based polyurethane on a nonwoven fabric.
Absorbent resin polymer (SAP) and wood pulp fluids in absorbent members for absorbent articles such as baby diapers, adult diapers, feminine sanitary napkins, blood absorbent materials, and breast pads, wherein said SAP is thinner and more shaped A highly absorbent sheet retained in a more stable nonwoven structure has been developed.
In order to impregnate the nonwoven fabric with SAP, a method of polymerizing the monomer by injecting an acrylic acid monomer into the nonwoven fabric, a method of polymerizing the acrylic acid monomer on the nonwoven fabric, coating the nonwoven fabric using the gelled non-crosslinked polymer and then cross- There is a method of using dispersed SAP slurry to coat the nonwoven fabric. Conventional patents using sodium polyacrylate powder, which is a high absorption polymer, are mainly used as hygiene products and moisture barrier agents for optical cables.
U.S. Patent Nos. 3,670,731 and 6,239,230 disclose a disposable diaper having excellent absorbency by mixing sodium polyacrylate powder partially neutralized with caustic soda (NaOH) to a mat or a batt. However, when shakeout occurs, the sodium polyacrylate powder is scattered and the weight is reduced or aggregated.
U.S. Patent No. 5,241,009 describes a method for producing a fiber-like superabsorbent polymer or a functional superabsorbent polymer, and since the women's sanitary napkin manufactured by such a method exhibits superior performance to the conventional product, a small and thin form Patent applications for using highly absorbent polymers for women's sanitary napkins are increasing. In addition, in the case of an adult diaper, a superabsorbent polymer of a type capable of exhibiting performance in a state in which a load is applied in consideration of the weight of adults is used. In the past, the focus was on increasing the rate of absorption of superabsorbent polymers by focusing on the large amount of urine released by adults, but more recently focusing on the rigidity or permeability of superabsorbent polymers.
U.S. Pat. Nos. 4,076,673 and 4,117,184 have also produced crosslinked superabsorbent polymer films by heat treatment of liquid superabsorbent polymers or by solvent removal. U.S. Patent Nos. 3,935,099, 3,997,383, 4,090,013 No. 3,669,103 discloses a method for producing a thin thermosetting sheet containing a superabsorbent polymer powder. However, since these methods can not be manufactured on a large scale, they are not commercially available.
On the other hand, in Patent Document 10-2009-0089220, a method of producing a superabsorbent fiber having a high strength is proposed in which a superabsorbent resin such as polypropylene (PP) or polyethylene (PE) . However, such a method requires an apparatus for manufacturing an air-laid nonwoven fabric which is complex or expensive.
To solve these problems, US Pat. Nos. 4,864,539, 5,582,786, and 6,436,323 disclose that the methods of spinning together with the solvent are inferior in productivity, and that using a separate hot- In the Korean Patent Publication No. 2002-2368, an elastomer superabsorbent thermoplastic material has been proposed. In Korean Patent 606300, an emulsion and a water-soluble or water-dispersible A superabsorbent material obtained by melt extrusion of a material into a resin has been proposed. However, the absorbent capacity of the material is lower or not improved as compared with the conventional absorbent material, thereby deteriorating the performance of the product.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a superabsorbent nonwoven fabric using sodium polyacrylate and oily polyurethane. The present invention relates to a method for producing a high absorptive nonwoven fabric by preparing a sodium polyacrylate emulsion having no agglomeration or gelation phenomenon by using a mixed solution of sodium polyacrylate, polyhydric alcohol, polyhydric alcohol and ethanol and adjusting the sodium polyacrylate content, reaction temperature, To provide a method of manufacturing a high-absorbency nonwoven fabric.
In one aspect, the present invention provides a method of making a fiber substrate, comprising: dipping a fibrous substrate into an oil based polyurethane; Preparing sodium polyacrylate emulsion by mixing sodium polyacrylate and polyhydric alcohol; And immersing the emulsion in a fibrous substrate in which the oil-based polyurethane is impregnated.
The sodium polyacrylate used in the present invention is a powder or a liquid having a high viscosity. It is not possible to place fibers between fibrous strands as well as to coat fibrous substrates such as nonwoven fabrics, but also to infiltrate into fibrous strands. It is possible to consider impregnating the fibrous base material such as nonwoven fabric by gelling the sodium polyacrylate with water, but it easily comes off from the nonwoven fabric and the sodium polyacrylate easily gels, making it difficult to apply to the nonwoven fabric.
On the other hand, when kneaded with liquid sodium polyacrylate and oily polyurethane, phase separation and agglomeration occur, and when sodium polyacrylate powder is mixed with water-dispersed polyurethane, gelation phenomenon occurs and it is difficult to use directly. In addition, when water-dispersed polyurethane and liquid sodium polyacrylate are kneaded, cross-linking or core-shell is formed, so that sodium polyacrylate, which is a superabsorbent polymer, does not swell even in contact with water .
However, the present invention is based on the premise that the absorbent composition is stably positioned between the fibrous substrate strands by impregnating the fibrous substrate with the oil-based polyurethane first, then impregnating the fibrous substrate with the emulsion containing polyhydric alcohol and sodium polyacrylate, Based absorbent composition does not fall off from the fiber substrate.
The step of immersing the oily polyurethane comprises immersing the fiber substrate with an oil-based polyurethane solution in an organic solvent. The organic solvent may be at least one of toluene (Toluene), methyl ethyl ketone (MEK), and dimethylformamide (DMF).
The step of immersing the oily polyurethane may further include the step of subscribing to a pickup rate of 75% or more.
The step of immersing the oily polyurethane may further include removing the organic solvent and drying the organic solvent.
After drying the oily polyurethane, the content of the oily polyurethane is 10-30% based on the oily polyurethane solution.
And ethanol is added during the formation of the sodium polyacrylate emulsion. Unlike other alcohols, ethanol is a solvent that can dilute an emulsion without causing condensation.
And the polyhydric alcohol is in the range of 0.1 to 10% by weight based on the total weight of the emulsion. The polyhydric alcohol may be at least one selected from the group consisting of glycerol, ethylene glycol, polypropylene glycol, diethylene glycol, butylene glycol, triethylene glycol, polyethylene glycol, Sorbitol, and glycerin.
After the step of preparing the sodium polyacrylate emulsion, at least one of ethanol and water is added to the emulsion so that the concentration of polyacrylate in the emulsion is 0.1 to 50% by weight based on the total weight of the emulsion do.
And reacting the sodium polyacrylate emulsion in a microwave oven.
The step of immersing the emulsion further comprises the step of subscribing so that the pickup ratio is 75% or more.
And a drying step after the immersion step of the emulsion.
In another aspect, the present invention provides an absorbent fibrous substrate characterized in that an absorbent composition comprising a sodium polyacrylate and a polyacrylic acid sodium emulsion of polyhydric alcohol and an oily polyurethane is coated on the fiber strands of the fiber substrate.
The polyhydric alcohol may be at least one selected from the group consisting of glycerol, ethylene glycol, polypropylene glycol, diethylene glycol, butylene glycol, triethylene glycol, polyethylene glycol, Sorbitol, and glycerin.
And the pickup ratio of the absorbent fibrous substrate is 75% or more.
The fibrous substrate may be a nonwoven or fabric.
The absorbent composition impregnated in the absorbent fibrous substrate is characterized in that the content of the emulsion of the sodium polyacrylate is not less than 0% by weight and not more than 1.0% by weight based on the total weight of the absorbent composition.
INDUSTRIAL APPLICABILITY As described above, by using the production method of the present invention, the sodium polyacrylate emulsion and the oil-based polyurethane can be impregnated into the nonwoven fabric to easily produce the highly water-absorbent nonwoven fabric. In addition, since a simple manufacturing method is not required, a special synthesizing device is not required, and a device for sintering in a high-temperature atmosphere is not required, so that the device can be used immediately in an industrial field, As a method, the marketability of the high-absorbency nonwoven fabric will be increased.
Fig. 1 shows a process flow chart for producing a superabsorbent nonwoven fabric using a sodium polyacrylate emulsion and an oil-based polyurethane.
FIG. 2 is a graph showing the swelling capacity of a sodium polyacrylate emulsion. Samples were prepared by adding water to a sodium polyacrylate emulsion and sodium polyacrylate having a high viscosity to impregnate the nonwoven fabric, followed by drying at 150.degree. C. for 5 minutes. The results of repeated experiments are shown in which the two kinds of sodium polyacrylate solutions thus prepared are immersed in water.
Fig. 3 shows a nonwoven fabric impregnated with oily polyurethane by impregnating a nonwoven fabric with a sodium polyacrylate emulsion and an oil-based polyurethane into a nonwoven fabric by 15% oil-based polyurethane, followed by drying at 150 ° C for 5 minutes. The thus prepared nonwoven fabric impregnated with water-dispersed polyurethane was impregnated with emulsion of liquid polyacrylic acid of 1.0% in the second order, squeezed using a mangling machine, and then dried at 150 ° C for 4 minutes to analyze the result of the superabsorbent nonwoven fabric will be.
FIG. 4 is a view showing a state in which the nonwoven fabric was impregnated with 15% oily polyurethane in order to impregnate the sodium polyacrylate emulsion and the oil-based polyurethane into the nonwoven fabric, followed by dipping in water to completely remove the organic solvent remaining in the nonwoven fabric and drying at 150 ° C for 5 minutes. The thus prepared nonwoven fabric was immersed in 1.0% liquid sodium polyacrylate in water and then woven using a mangling machine, followed by drying at 150 DEG C for 4 minutes.
Fig. 5 shows the change in fabric thickness and the change in weight when immersed in water, obtained by re-immersing the poly (sodium acrylate emulsion) after immersing and drying the oil-based polyurethane on various types of fiber fabrics.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "comprises" or "having ", etc. is intended to specify that there is a feature, step, operation, element, part or combination thereof described in the specification, , &Quot; an ", " an ", " an "
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
The stepwise process for producing the superabsorbent nonwoven fabric according to the present invention includes the following steps. 1 is referred to.
(1) Impregnating and drying the nonwoven fabric with an oil-based polyurethane : For example, a pick-up rate of the nonwoven fabric in a wet state using a mangling machine is set to 75% or more, and the nonwoven fabric containing the oil- For example, drying at less than 200 DEG C for less than 30 minutes or immersing in water to completely remove the solvent remaining in the nonwoven fabric and then drying (first step);
(2) Sodium polyacrylate Second step of preparing an emulsion : A solution prepared by mixing 10% or less of polyhydric alcohol or polyhydric alcohol with ethanol in high purity liquid sodium polyacrylate or sodium polyacrylate is added and stirred to obtain poly Preparing a sodium acrylate (SAP) emulsion (second step);
(3) Sodium polyacrylate Dilution of emulsion and microwave treatment Step: At room temperature, at least one of ethanol and distilled water of 99.9% or less is added to the third step solution so that the content of sodium polyacrylate emulsion is adjusted to 50% or less, and the diluted sodium polyacrylate The emulsion is microwave treated in a microwave oven for 10 hours or less (third step);
(4) immersing the nonwoven fabric in the emulsion : the fourth step of immersing the sodium polyacrylate emulsion in the nonwoven fabric impregnated with the oil-based polyurethane (step 4);
(5) Pressurizing the manufactured fiber substrate: ( step 5) impregnating the nonwoven fabric with sodium polyacrylate emulsion using a nonwoven fabric impregnated with sodium polyacrylate; And
(6) Heat treatment step: The nonwoven fabric obtained in the fifth step is allowed to stand in a temperature range of 80 to 200 ° C for 30 minutes or less to coat a sodium polyacrylate emulsion onto a nonwoven fabric impregnated with an oil-based polyurethane (step 6) .
The absorbent fibrous base material of the present invention can produce a nonwoven fabric containing a superabsorbent resin by the above-mentioned combined action of the above steps.
As described above, each step of the present invention will be described in detail as follows.
The sodium polyacrylate used in the present invention is a powder and a liquid having a high viscosity. Phase separation and agglomeration occur when liquid sodium polyacrylate and oily polyurethane are kneaded. When sodium polyacrylate powder is mixed with water-dispersed polyurethane, gelation phenomenon occurs and it is difficult to use directly.
In addition, when water-dispersed polyurethane and liquid sodium polyacrylate are kneaded, cross-linking or core-shell is formed, so that sodium polyacrylate, which is a superabsorbent polymer, does not swell even in contact with water . Due to such technical problems, it is very difficult to produce a superabsorbent nonwoven fabric using sodium polyacrylate and water-dispersed polyurethane.
Accordingly, in order to solve such problems, the present invention implements a nonwoven fabric containing an oil-based polyurethane by impregnating and drying an oil-based polyurethane into a nonwoven fabric. In order to impregnate the nonwoven fabric impregnated with the oil-based polyurethane into the superabsorbent polymer composition, a polyacrylic acid emulsion was prepared using polyhydric alcohols of 10% or less in sodium polyacrylate. The sodium polyacrylate emulsion thus prepared did not show gelation or agglomeration even when left at room temperature for 6 months or more.
Also, it was confirmed that as the content of the polyhydric alcohol increases, the viscosity of the sodium polyacrylate decreases and the time for producing a uniform mixed solution is shortened. Therefore, a method of preparing an emulsion by adding a polyhydric alcohol to liquid sodium polyacrylate and a method of preparing an emulsion by using a polyhydric alcohol and an ethanol mixed solution in solid polyacrylic acid sodium salt are effective methods for preventing gelation and aggregation have.
The first step is a step of preparing a fibrous base material containing an oil-based polyurethane, for example, a nonwoven fabric. First, a certain amount of toluene, methyl ethyl ketone (MEK) and dimethylformamide (DMF) is added to a highly viscous oily polyurethane After the polyurethane is impregnated into the nonwoven fabric by adjusting the content and viscosity, the polyurethane is adjusted to have a pick-up rate of 75% or more by using a mangling machine and dried at 200 ° C. or less for 30 minutes or immersed in water, By completely removing the solvent remaining in the nonwoven fabric and drying, the content of the oily polyurethane is preferably in the range of about 10 to 30% by weight.
In the second step, the polyhydric alcohol type for producing the sodium polyacrylate emulsion is selected from the group consisting of ethylene glycol, polypropylene glycol, diethylene glycol, triethylene glycol, low molecular weight polyethylene glycol, glycerin, etc. in an amount of 10% Ethanol mixed solution is added and mixed. The preferred polyalcohol content is in the range of 0.1%.
On the other hand, when the content of the polyhydric alcohol to be added is 10% or more, it is effective in lowering the viscosity of sodium polyacrylate, but after a certain period of time, the polyhydric alcohol is phase-separated with sodium polyacrylate. It causes stains due to poor mixing with polyurethane. When the content of the polyhydric alcohol is 0.1% or less, kneading with sodium polyacrylate is difficult, and when the emulsion thus prepared is mixed with the water-dispersed polyurethane and infiltrated into the nonwoven fabric, there is a problem that the emulsion does not swell or gel in an aqueous environment.
In the third step, at least one of 99.9% ethanol and distilled water is added to the polyacrylic acid sodium emulsion obtained in the second step to adjust the sodium polyacrylate content to 50% or less. The preferred sodium polyacrylate content is in the range of 10-20%. When the ethanol concentration used for diluting the sodium polyacrylate emulsion is 50% or more, sodium polyacrylate flocculates and precipitates, so that the ethanol concentration is preferably 50% or less. In addition, when a combination of alcohols such as water, ethanol and methanol is applied in order to adjust the sodium polyacrylate content, a sodium polyacrylate emulsion can be produced without aggregation or precipitation, which is effective.
The third step of the present invention may include reacting the sodium polyacrylate emulsion prepared in the second step in a microwave oven for 10 hours or less.
In the fourth and fifth steps, the sodium polyacrylate emulsion prepared in the third step is immersed in the nonwoven fabric impregnated with the oil-based polyurethane prepared in the first step. The content of the emulsion of the sodium polyacrylate prepared in the third step is adjusted to 1.0% or less and the fiber substrate is immersed. When the content of sodium polyacrylate is 1% or more, gelation occurs in an aqueous environment, so it is preferable to adjust the sodium polyacrylate content to 1.0% or less.
The time for immersing the mixed solution in the nonwoven fabric impregnated with the oil-based polyurethane is preferably 30 minutes or less during which the nonwoven fabric can be completely absorbed, and the pressure of the mangle is preferably 4 psi and the rpm is preferably 8. When the pickup ratio is 75% or less, it is preferable that the pickup ratio is increased by 75% or more by re-immersing the nonwoven fabric in the mixed solution.
The sixth step is a step of drying the nonwoven fabric prepared in the fifth step at a temperature of 80 to 200 ° C. In order to uniformly infiltrate the nonwoven fabric with the mixed solution of sodium polyacrylate and water-dispersed polyurethane, It is a necessary step. When the reaction temperature is 80 ° C or less, the drying time is 30 minutes or more. When the reaction temperature is 200 ° C or more, the nonwoven fabric shows yellowing. Therefore, it is preferable to dry it at 120 to 150 ° C for 10 minutes or less. Through this process, a highly absorbent nonwoven fabric in which sodium polyacrylate is uniformly penetrated into the nonwoven fabric impregnated with the oil-based polyurethane can be produced.
Particularly, when air permeability, water resistance and swelling ability are required depending on the use of the product, the crosslinking reaction is increased by using a microwave oven in the third step, and the concentration of sodium polyacrylate, The absorbent nonwoven fabric can be manufactured by drying the nonwoven fabric obtained by controlling the concentration of the oil phase polyurethane and the pickup ratio in the first step.
Hereinafter, the present invention will be described in detail with reference to examples.
However, the following examples are intended to illustrate the invention and should not be construed as limiting the scope of the invention.
FIG. 2 is a graph showing the swelling capacity of the sodium polyacrylate emulsion according to the present invention. The sodium polyacrylate emulsion of the present invention and a comparative sample prepared by adding water to pure liquid sodium polyacrylate that does not contain polyhydric alcohol Impregnated with nonwoven fabric, and then dried at 150 DEG C for 5 minutes. Two kinds of sodium polyacrylate solutions thus prepared were immersed in water and repeatedly tested.
Weight loss
The solution prepared by adding water to the high viscosity sodium polyacrylate gel was agglomerated and gelation phenomenon occurred as time progressed. In addition, the nonwoven fabric impregnated with the gelled sodium polyacrylate solution was dipped in water, dried again, and the weight was measured. The weight reduction rate was about 50%. It is confirmed that sodium polyacrylate is discharged from the nonwoven fabric.
However, the polyacrylic acid sodium emulsion prepared using the polyhydric alcohol did not cause aggregation at all, and even after three repeated experiments, the swelling power was constant and there was no weight reduction at all.
Fig. 3 shows a nonwoven fabric impregnated with an oil-based polyurethane to prepare a nonwoven fabric impregnated with 15% oily polyurethane by padding the nonwoven fabric with 15% oily polyurethane to effectively impregnate the nonwoven fabric with the sodium polyacrylate emulsion and the oil-based polyurethane. The liquid nonwoven fabric impregnated with the oil-based polyurethane thus prepared was impregnated with the emulsion in the second order of 1.0% by weight of liquid sodium polyacrylate, squeezed using a mangling machine, and dried at 150 ° C for 4 minutes to prepare a superabsorbent nonwoven fabric. The air permeability of the superabsorbent nonwoven fabric prepared using the oil-based polyurethane and the sodium polyacrylate emulsion was 30.2 (cm3 / cm3 / s), and the surface of the nonwoven fabric was coated with the oil-based polyurethane and sodium polyacrylate emulsion . On the other hand, as a result of the weight reduction by repeated experiment, the weight loss did not occur.
FIG. 4 is a view showing the result of pouring 15% oily polyurethane into a nonwoven fabric and immersing it in water to completely remove the organic solvent remaining on the nonwoven fabric and drying at 150 ° C for 5 minutes. 1.0% of liquid sodium polyacrylate was immersed in the nonwoven fabric thus prepared, squeezed using a mangling machine, and then dried at 150 DEG C for 4 minutes to prepare a superabsorbent nonwoven fabric. The air permeability of the superabsorbent nonwoven fabric prepared by using the oil-based polyurethane and the sodium polyacrylate emulsion was 30.5 (cm3 / cm3 / s) when dry, and the surface of the nonwoven fabric was coated with the oil-based polyurethane and sodium polyacrylate emulsion .
Fig. 5 shows changes in the thickness of the water absorbent fabric and the amount of swelling after immersion, after immersing and drying the oil-based polyurethane on various kinds of fabrics and then re-immersing the sodium polyacrylate emulsion. The thickness of the nonwoven fabric immersed in oily polyurethane and sodium polyacrylate was increased, and the weight after immersion in water was also increased.
Claims (19)
Mixing sodium polyacrylate and polyhydric alcohol to prepare a sodium polyacrylate emulsion;
And immersing the emulsion in the fibrous substrate in which the oil-based polyurethane is immersed.
A method for manufacturing an absorbent fibrous substrate.
Wherein the sodium polyacrylate is in a liquid or solid phase.
A method for manufacturing an absorbent fibrous substrate.
Wherein the step of immersing the oily polyurethane comprises immersing the fiber substrate in an organic solvent in an aqueous polyurethane solution,
A method for manufacturing an absorbent fibrous substrate.
Wherein the organic solvent is at least one of toluene (Toluene), methyl ethyl ketone (MEK), and dimethylformamide (DMF).
A method for manufacturing an absorbent fibrous substrate.
Wherein the step of immersing the oily polyurethane further comprises the step of subscribing to a pickup rate of 75% or more.
A method for manufacturing an absorbent fibrous substrate.
Wherein the step of immersing the oily polyurethane further comprises removing the organic solvent and drying the organic solvent.
A method for manufacturing an absorbent fibrous substrate.
Characterized in that the content of said oily polyurethane after drying said oily polyurethane is 10-30% with respect to said oily polyurethane solution.
A method for manufacturing an absorbent fibrous substrate.
Characterized in that ethanol is added during the formation of the sodium polyacrylate emulsion.
A method for manufacturing an absorbent fibrous substrate.
Wherein the polyhydric alcohol is in the range of 0.1 to 10% by weight based on the total weight of the emulsion.
A method for manufacturing an absorbent fibrous substrate.
The polyhydric alcohol may be at least one selected from the group consisting of glycerol, ethylene glycol, polypropylene glycol, diethylene glycol, butylene glycol, triethylene glycol, polyethylene glycol, Sorbitol, and glycerin. ≪ RTI ID = 0.0 >
A method for manufacturing an absorbent fibrous substrate.
After the step of preparing the sodium polyacrylate emulsion, at least one of ethanol and water is added to the emulsion so that the concentration of polyacrylate in the emulsion is 0.1 to 50% by weight based on the total weight of the emulsion doing,
A method for manufacturing an absorbent fibrous substrate.
And reacting the sodium polyacrylate emulsion in a microwave oven.
A method for manufacturing an absorbent fibrous substrate.
Wherein the step of immersing the emulsion further comprises pressing the emulsion so that the pickup ratio is 75% or more.
A method for manufacturing an absorbent fibrous substrate.
Characterized in that it further comprises a drying step after the immersion step of said emulsion.
A method for manufacturing an absorbent fibrous substrate.
Polyacrylic acid sodium emulsion of polyhydric alcohol; And
Characterized in that an absorbent composition comprising an oil-based polyurethane is coated on the fiber strands of the fiber substrate,
Absorbent fibrous substrate.
The polyhydric alcohol may be at least one selected from the group consisting of glycerol, ethylene glycol, polypropylene glycol, diethylene glycol, butylene glycol, triethylene glycol, polyethylene glycol, Sorbitol, and glycerin. ≪ RTI ID = 0.0 >
Absorbent fibrous substrate.
Characterized in that the pick-up rate of the absorbent fibrous substrate is at least 75%
Absorbent fibrous substrate.
Characterized in that the fibrous substrate is a nonwoven or fabric.
Absorbent fibrous substrate.
Wherein the water absorbent composition impregnated in the water absorbent fiber substrate has an emulsion content of the sodium polyacrylate of not less than 0% by weight and not more than 1.0% by weight based on the total weight of the water absorbent composition.
Absorbent fibrous substrate.
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| KR1020150159872A KR101800085B1 (en) | 2015-11-13 | 2015-11-13 | Moisture superabsorbent composition using solvent type polyurethane and moisture absorbing fiber based textile using the compostion and a method thereof |
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| KR1020150159872A KR101800085B1 (en) | 2015-11-13 | 2015-11-13 | Moisture superabsorbent composition using solvent type polyurethane and moisture absorbing fiber based textile using the compostion and a method thereof |
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| KR101800085B1 true KR101800085B1 (en) | 2017-11-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100372382B1 (en) | 1996-12-13 | 2003-03-31 | 가부시키가이샤 니혼규슈다이기쥬쓰겡뀨쇼 | Highly absorbent composite compositions, absorbent sheets provided with the compositions, and process for producing the same |
| KR200390463Y1 (en) | 2005-04-21 | 2005-07-21 | 주식회사 대일제약 | Band for medical treatment spreaded to hydrogel |
| US20080032014A1 (en) | 2004-06-07 | 2008-02-07 | Basf Aktiengesellschaft | Superabsorbent Printable Compositions |
| KR101382030B1 (en) | 2011-08-04 | 2014-04-14 | 코오롱인더스트리 주식회사 | Superabsorbent Yarn and Method for Manufacturing The Same |
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2015
- 2015-11-13 KR KR1020150159872A patent/KR101800085B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100372382B1 (en) | 1996-12-13 | 2003-03-31 | 가부시키가이샤 니혼규슈다이기쥬쓰겡뀨쇼 | Highly absorbent composite compositions, absorbent sheets provided with the compositions, and process for producing the same |
| US20080032014A1 (en) | 2004-06-07 | 2008-02-07 | Basf Aktiengesellschaft | Superabsorbent Printable Compositions |
| KR200390463Y1 (en) | 2005-04-21 | 2005-07-21 | 주식회사 대일제약 | Band for medical treatment spreaded to hydrogel |
| KR101382030B1 (en) | 2011-08-04 | 2014-04-14 | 코오롱인더스트리 주식회사 | Superabsorbent Yarn and Method for Manufacturing The Same |
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| KR20170056328A (en) | 2017-05-23 |
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