CN108166335B - Water-absorbing non-woven fabric, preparation method thereof and paper diaper based on non-woven fabric - Google Patents
Water-absorbing non-woven fabric, preparation method thereof and paper diaper based on non-woven fabric Download PDFInfo
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- CN108166335B CN108166335B CN201711441712.7A CN201711441712A CN108166335B CN 108166335 B CN108166335 B CN 108166335B CN 201711441712 A CN201711441712 A CN 201711441712A CN 108166335 B CN108166335 B CN 108166335B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
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- 239000010410 layer Substances 0.000 claims description 99
- 235000012343 cottonseed oil Nutrition 0.000 claims description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 82
- 239000000243 solution Substances 0.000 claims description 67
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- 238000010521 absorption reaction Methods 0.000 claims description 39
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
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Images
Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould
-
- 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 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 specially adapted to be worn around the waist, e.g. diapers, nappies
- A61F13/496—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 specially adapted to be worn around the waist, e.g. diapers, nappies in the form of pants or briefs
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Wood Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Manufacturing & Machinery (AREA)
- Epidemiology (AREA)
- Biomedical Technology (AREA)
- Inorganic Chemistry (AREA)
- Vascular Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention discloses a preparation method of a water-absorbing non-woven fabric, which adopts a solution polymerization method to prepare a high water-absorbing resin on the surface of a cotton seed hull particle in a temperature programming mode, and then utilizes the polymerization characteristic of the resin to play a role in adhesion to adhere the cotton seed hull particles together to prepare a high water-absorbing layer.
Description
Technical Field
The invention relates to the technical field of processing of paper diapers, in particular to a water-absorbing non-woven fabric, a preparation method of the water-absorbing non-woven fabric and a paper diaper based on the non-woven fabric.
Background
With the development of society, the nursing problem of babies is more and more emphasized, and the paper diaper has been developed for several generations from the prior simple diaper to the prior paper diaper. Although the existing paper diapers have more and more functions and more perfect nursing functions, practical functions are not developed all the time, for example, the skin of a baby is tender and easy to cut or break, a wound is exposed and easy to cause wound infection, and especially when the baby parents go out with the baby, the baby parents often forget to carry some sanitary products such as tissues and the like.
For example, patent application No. 200520095592.6 discloses a multifunctional dry diaper, which comprises a diaper with an opening in the crying interlayer, and a guard paper is arranged in the opening, but the patent does not isolate the guard paper, so that the excrement of the baby can permeate back to the guard paper, and if the excrement of the baby carries parasites, secondary infection can be caused.
The technical scheme of the multifunctional independent-bag nursing tissue paper diaper disclosed in patent application 200520097267 includes a nursing tissue and a paper diaper, wherein the nursing tissue is folded into a bag shape, the paper diaper is arranged inside the nursing tissue, and the edge of the bag-shaped nursing tissue is embossed and positioned.
Panty-shape diapers include the top layer usually in proper order from outer to inner, absorb sandwich layer and close skin layer, and some panty-shape diapers still are provided with the water conservancy diversion layer absorbing between sandwich layer and the close skin layer, and the water conservancy diversion effect through the water conservancy diversion layer improves the urine and flows in to the precision of absorbing the sandwich layer, prevents the unordered flow of urine. The skin-friendly layer is usually made of hot air or hot-rolled non-woven materials, and is required to be soft and breathable, and also needs to enable urine to quickly permeate, so that the dryness of the skin-close surface is kept. The wicking layer is often a through-air nonwoven material made of thermoplastic fibers or bicomponent fibers to allow for rapid urine transfer to the entire surface of the absorbent core. The absorbent core layer is often composed of fluff pulp and SAP, a high water-absorbent resin, and is used to absorb a large amount of liquid. The surface layer is mainly a polypropylene breathable microporous film or a hot-rolled non-woven material polyethylene composite basement membrane, is used for preventing urine from seeping and plays a role in isolation.
Super absorbent resin SAP is novel functional polymer material, as a synthetic resin, and the independent use has the defects of poor flexibility, high cost, large volume and the like. The cotton as a natural plant comprises cotton fiber and cotton seed hulls, wherein the cotton fiber is basically composed of cellulose, and the main component of the cotton seed hulls is lignin.
Patent application 201510496205.8 discloses a compound silk fabric absorbs water, it is viscose fiber precoat to absorb water in the middle of it, ramie fiber precoat, in jute fiber precoat and the wool fiber precoat one or several kinds, its surface parcel one deck silk precoat, do not carry out systematic improvement to the raw materials, the adoption is that fibre material superimposed mode forms the space layer, and then the effect of absorbing water that forms, and the raw and other materials price that take the silk as the first is expensive, under this energy saving and emission reduction's era, such mode is not advisable a bit.
Patent application 201610936127.3 discloses an edible fungus mother clock culture medium using cottonseed hull as raw material, which is prepared from cottonseed hull as base material and rich nutrients such as cellulose, lignin and protein, wherein lignin rich in cottonseed hull has good toughness, and the prepared culture medium is porous and air-permeable. The lignin can be used as a good bracket type structural material, simultaneously, the lignin is degradable, the influence degree on the environment is small, and the application of the cottonseed hulls is not extended in multiple ranges, particularly the application on textile fabrics.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a water-absorbing non-woven fabric used for an intermediate layer of a paper diaper, which has good absorption capacity and absorption performance on water and urine, is mainly made of cottonseed hulls, is cheap and easy to obtain, a preparation method thereof and the paper diaper based on the non-woven fabric.
The invention solves the technical problems through the following technical means: the method is characterized in that cottonseed hulls of cotton are used as main raw materials, the production is mainly used for preparing middle-layer absorbent cotton of the paper diaper, cotton ginning machine cotton-pumping is carried out on cotton containing the cotton seeds, meanwhile, 15-25% of the cotton amount of the surface of the cottonseed hulls is kept, uniform airing treatment is carried out, then, the aired cotton seeds are ground and crushed for 3-5 times, compression rollers are used for front extrusion in the grinding process, the compression rollers are prevented from carrying out friction type grinding process, finally, screening is carried out, and cotton seed hull particles with cotton fibers at one end are screened out, and the particle size is 0.5-1.0 mm.
One end of the cottonseed hull particle mainly contains lignin as a main chitin component, and is a particle end; the connected cotton fibers are basically all cellulose components and are fiber ends; the invention carries out the modification treatment of grafted resin on the particle ends of the cottonseed hull particles to prepare high water absorption, then the resin at the particle ends is bonded together to form a main water absorption layer, and the cotton fibers connected with the fiber ends of the cottonseed hull particles are free ends and extend to two sides of the water absorption layer to form the free ends. The specific method comprises the following steps: carrying out lignin sulfonation treatment on the particle end of the cottonseed hull particles, adding the cottonseed hull particles into a reaction kettle by adopting a high-temperature sulfonation method according to the mass ratio of 1:1 to 40-50 ℃,Na2SO3adding 1-2% of ferric chloride as a catalyst into warm water with the content of 15-50%, spraying 5mol/L NaOH solution to adjust the pH value to 9-10, keeping the temperature to 90-120 ℃, reacting for 3.5-4.5 h, filtering after the reaction is finished, rinsing the obtained cottonseed hull particles for 2-3 times by using clear water, and introducing sulfonic groups into lignin side chains at the particle ends of the cottonseed hull particles, so that most of lignin at the particle ends of the cottonseed hull particles is converted into sodium lignin sulfonate, the content of lignin is reduced, and the particle ends are softened at the same time, thereby facilitating the subsequent further processing.
Then preparing a cross-linked resin solution, preparing an acrylic acid solution with water dilution concentration of 10-20% in advance, and regulating the neutralization degree to be 60% by adopting a 5mol/L NaOH solution; then adding deionized water into an acrylamide monomer solution according to the material-to-liquid ratio of 1: 8-10 for dilution, sequentially adding a cross-linking agent N' N-methylene bisacrylamide to the concentration of 0.1-0.2%, adding an initiator potassium persulfate to the concentration of 1.0-1.5%, stirring and uniformly mixing, adding the sulfonated cottonseed hull particles, uniformly mixing again, then mixing the prepared acrylic acid solution according to the ratio of 1:1, and adopting a step heating mode: the method comprises the following steps of respectively carrying out heat preservation reaction at 65 ℃, 75 ℃ and 85 ℃ for 1.5-2.5 h, then transferring the mixed solution into a reaction tank with a bottom surface paved with a layer of cotton non-woven fabric while the mixed solution is hot, adjusting the height of the solution to be 5-10 cm, naturally cooling, then filtering redundant water and resin solution which is not subjected to cross-linking reaction by using the cotton non-woven fabric, uniformly paving a cross-linked resin layer on the non-woven fabric, keeping the thickness uniform, drying by blowing hot air, stripping the non-woven fabric, carrying out friction polishing on the dried resin by using sand paper, allowing the surface of the resin layer to be rough, simultaneously allowing a fiber end to be separated from the resin layer, and finally repeatedly rolling by using a large-diameter roller until the resin layer is moderately flexible.
The invention also discloses the water-absorbing non-woven fabric prepared by the preparation method of the water-absorbing non-woven fabric.
The invention also discloses a paper diaper based on the water-absorbing non-woven fabric, which sequentially comprises a skin-friendly layer, a water-absorbing non-woven fabric layer, an isolating layer, an interlayer and an external surface layer from inside to outside; two folding pieces are arranged in the middle of the skin-friendly layer, wherein one side of each folding piece is fixedly connected with the edge of the skin-friendly layer; the interlayer is positioned between the isolation layer and the outer surface layer; the external surface layer is provided with a pre-tearing ear and the middle part is provided with a cutting line; the cutting line is wound in a zigzag manner to cut an external surface layer into a zigzag belt structure; the skin-friendly layer, the water-absorbing non-woven fabric layer, the isolation layer and the outer surface layer are sequentially adhered to form the water-absorbing non-woven fabric.
Preferably: the skin-friendly layer and the folding sheet are made of the same material and are both hot-rolled non-woven fabrics.
Preferably: the isolation layer includes a polytetrafluoroethylene membrane.
Preferably: the isolation layer and the external surface layer are both polypropylene films or hot-rolled non-woven material polyethylene composite basement membranes.
The invention has the advantages that: the invention adopts a solution polymerization method to prepare the super absorbent resin on the surface of the cottonseed hull particles in a temperature programming way, and then utilizes the polymerization characteristic of the resin to play a role in adhesion to adhere the cottonseed hull particles together to prepare a super absorbent layer.
Moreover, the invention adopts the cotton seed hulls as the raw materials not only because the yield of the cotton seed hulls is huge, but also the main component of the cotton seed hulls is lignin, the cotton fiber whose surface is not completely removed is basically cellulose, the reaction of the invention is lignin, has no obvious damage effect on the cellulose, so the cotton fiber is basically not influenced, the lignin is grafted and bonded with the resin after being modified, and finally the water absorbing layer is prepared, one end of the cotton fiber mainly made of cellulose is connected with the cottonseed hull particles, the other end is a free end, after the surface of the prepared water absorbing layer is polished, the cotton fiber is further liberated, the other end of the cotton fiber is changed into a free end again, so that the surface of the prepared water absorbing layer is rough, the cotton fibers are beneficial to reducing the surface tension of water, generating a micro water absorption pipeline with similar siphon action and accelerating water absorption.
The water absorption layer is not only used as a direct water absorption contact fabric, but also a layer of non-woven fabric is bonded on two surfaces of the water absorption layer when the water absorption layer is formally used, so that on one hand, the surface of the rough water absorption layer is smooth, on the other hand, the layering sense of the prepared paper diaper and other materials is distinct, the cotton fiber is used for accelerating water absorption, and simultaneously, the cotton fiber and the covered non-woven fabric form a space layer, so that the water retention capacity of the fabric is improved.
By adopting the paper diaper, when a baby carelessly discards or dirties the own cap and does not have the cap to wear temporarily, the folding piece can be unfolded to be worn as a temporary cap; when the excretion of the baby is completed, the guardian can directly pull the pre-tearing ear open to take out the paper towel in the interlayer to complete the wiping and cleaning work; after the baby is accidentally injured, the cutting line on the paper diaper can be used for tearing to obtain a clip-shaped belt for temporarily wrapping the baby to prevent further infection.
Furthermore, the folding sheet is made of non-woven fabric, so that ventilation is reduced and the warm-keeping effect is improved when the folding sheet is used as a hat; the paper towel is divided into wet paper towel and dry paper towel, wherein the wet paper towel is soaked with mixed solution of stemonine, acetic acid and sodium chloride, the solution can effectively kill eggs produced by animals such as pinworm in the genus of Enteromorpha of family Endocarpifolia in the family of Endocarpium ascariaceae in the vicinity of infant anus, meanwhile, the pH value is weakly acidic and is close to the pH value of infant skin, the infant skin cannot be injured, and the dry paper towel is used for cleaning and absorbing the solution remained on the infant skin on the wet paper towel.
Drawings
Fig. 1 is a schematic structural view of a diaper of the present invention.
Fig. 2 is a schematic view of the skin-friendly layer of the diaper of the present invention.
Fig. 3 is a schematic view of the outer cover of the diaper of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment discloses a preparation method of a water-absorbing non-woven fabric, which comprises the following steps:
(1) cotton seeds which are not removed are subjected to cotton gin cotton extraction, and meanwhile, the cotton quantity of 15wt% of the surface of the cotton seed hulls is kept, namely 15% of the total cotton mass in the cotton seed hulls, so that the cotton seeds are obtained; uniformly drying the cotton seeds, wherein the water content of the cotton seeds is 8%, repeatedly grinding the dried cotton seeds for 3 times, sieving, and screening out crushed cotton seed kernels, residues and a small amount of impurities to obtain cotton seed hull particles with cotton fibers at one end, wherein the particle size of the cotton seed hull particles is 0.5 mm.
(2) Adding the cottonseed hull particles into the mixture at a mass ratio of 1:1, and adding Na into the mixture at a temperature of 40 DEG C2SO3Na content of 15wt%2SO3Adding ferric chloride into the aqueous solution, spraying 5mol/L NaOH solution to adjust pH to 9, reacting for 4.5h at 90 ℃, filtering after completion, and rinsing the obtained cottonseed hull particles for 2 times by using clear water. Wherein the ferric chloride is Na2SO31wt% of the aqueous solution.
(3) Preparing an acrylic acid aqueous solution with water dilution concentration of 10wt% in advance, and regulating the neutralization degree to be 60% by adopting a 5mol/L NaOH solution for later use; adding deionized water into an acrylamide monomer solution according to the material-to-liquid ratio of 1: 10 for dilution to obtain an acrylamide aqueous solution, then sequentially adding a cross-linking agent N' N-methylene bisacrylamide and adding an initiator potassium persulfate, stirring and uniformly mixing, adding the modified cottonseed hull particles, uniformly mixing again, finally mixing the prepared sodium acrylate solution according to the mass ratio of 1:1, and adopting a step heating mode: reacting at 65 deg.C, 75 deg.C and 85 deg.C for 1.5h to obtain cottonseed hull particle solution containing graft resin, and maintaining at 70 deg.C for use. Wherein, N' N-methylene-bisacrylamide accounts for 0.1wt% of the mass of the acrylamide aqueous solution, and potassium persulfate accounts for 1wt% of the mass of the acrylamide aqueous solution.
(4) Transferring the heat-insulated cottonseed hull particle solution containing the grafted resin to a flat-bottom pool with a layer of cotton non-woven fabric paved on the bottom surface, adjusting the liquid level of the solution to be 5cm away from the pool bottom, naturally cooling for 30min, opening a pool bottom floor drain, filtering redundant water and resin solution which is not subjected to cross-linking reaction by using the cotton non-woven fabric, keeping the thickness of the cottonseed hull particle layer of the grafted resin uniform, drying by blowing hot air, and then stripping the non-woven fabric to obtain a primary water absorption layer made of the cottonseed hull particles.
(5) And (3) performing friction polishing on the primary water absorption layer by using abrasive paper, and finally repeatedly pressing and rolling the water absorption layer for 10 times by using a roller with the caliber of 50 cm.
Example 2
The embodiment discloses a preparation method of a water-absorbing non-woven fabric, which comprises the following steps:
(1) cotton seeds which are not removed are subjected to cotton ginning by a cotton ginning machine, and meanwhile, 20w% t of the surface of the cotton seed hulls, namely the cotton amount of 20% of the total cotton mass in the cotton seed hulls, is reserved to obtain the cotton seeds; uniformly drying the cotton seeds, wherein the water content of the cotton seeds is not more than 9%, repeatedly grinding the dried cotton seeds for 4 times, sieving, and screening out crushed cotton seed kernels, residues and a small amount of impurities to obtain cotton seed hull particles with cotton fibers at one end, wherein the particle size of the cotton seed hull particles is 0.7 mm.
(2) Adding the cottonseed hull particles into the mixture at a mass ratio of 1:1, and adding Na to the mixture at a temperature of 45 DEG C2SO3Na content of 30wt%2SO3Adding ferric chloride into the aqueous solution, spraying 5mol/L NaOH solution to adjust the pH value to 9, preserving the temperature at 105 ℃, reacting for 4.0h, filtering after the reaction is finished, and rinsing the obtained cottonseed hull particles for 2 times by using clear water. Wherein the ferric chloride is Na2SO31.5wt% of the aqueous solution.
(3) Preparing an acrylic acid aqueous solution with water dilution concentration of 15wt% in advance, and regulating the neutralization degree to be 60% by adopting a 5mol/L NaOH solution for later use; adding deionized water into an acrylamide monomer solution according to the material-to-liquid ratio of 1:9 for dilution to obtain an acrylamide aqueous solution, then sequentially adding a cross-linking agent N' N-methylene bisacrylamide and an initiator potassium persulfate, stirring and uniformly mixing, adding the modified cottonseed hull particles, uniformly mixing again, finally mixing the prepared sodium acrylate solution according to the mass ratio of 1:1, and adopting a step heating mode: reacting at 65 deg.C, 75 deg.C and 85 deg.C for 2.0h to obtain cottonseed hull particle solution containing graft resin, and maintaining at 65 deg.C for use. Wherein, N' N-methylene-bisacrylamide accounts for 0.1wt% of the mass of the acrylamide aqueous solution, and potassium persulfate accounts for 1.5wt% of the mass of the acrylamide aqueous solution.
(4) Transferring the heat-insulated cottonseed hull particle solution containing the grafted resin to a flat-bottom pool with a layer of cotton non-woven fabric paved on the bottom surface, adjusting the height of the liquid level of the solution to 7.5cm from the bottom of the pool, naturally cooling for 25min, opening a floor drain on the bottom of the pool, filtering redundant water and resin solution which is not subjected to cross-linking reaction by using the cotton non-woven fabric, keeping the thickness of the cottonseed hull particle layer of the grafted resin uniform, drying by blowing hot air, and then stripping the non-woven fabric to obtain a primary water absorption layer made of the cottonseed hull particles.
(5) And (3) performing friction polishing on the primary water absorption layer by using abrasive paper, and finally repeatedly pressing and rolling the water absorption layer for 7 times by using a roller with the caliber of 75 cm.
Example 3
The embodiment discloses a preparation method of a water-absorbing non-woven fabric, which comprises the following steps:
(1) cotton which is not subjected to seed removal is subjected to cotton gin cotton extraction, and meanwhile, 25wt% of cotton quantity on the surface of the cotton seed shell, namely 25% of the total cotton mass in the cotton seed shell, is reserved to obtain the cotton seeds; uniformly drying the cotton seeds, wherein the water content of the cotton seeds is 7.5%, repeatedly grinding the dried cotton seeds for 3 times, sieving, and screening crushed cotton seed kernels, residues and a small amount of impurities to obtain cotton seed hull particles with cotton fibers at one end, wherein the particle size of the cotton seed hull particles is 1.0 mm.
(2) Adding the cottonseed hull particles into the mixture at 50 ℃ according to the mass ratio of 1:1, and adding Na2SO3Na content of 20w%2SO3Adding ferric chloride into the aqueous solution, spraying 5mol/L NaOH solution to adjust the pH value to 9, preserving the temperature at 120 ℃, reacting for 3.5h, filtering after the reaction is finished, and rinsing the obtained cottonseed hull particles for 3 times by using clear water. Wherein the ferric chloride is Na2SO31.5wt% of the aqueous solution.
(3) Preparing 20 wt% acrylic acid water solution diluted by water in advance, and regulating the neutralization degree to be 60% by adopting 5mol/L NaOH solution for later use; adding deionized water into an acrylamide monomer solution according to the material-to-liquid ratio of 1:8 for dilution, then sequentially adding a cross-linking agent N' N-methylene bisacrylamide and an initiator potassium persulfate, stirring and uniformly mixing, then adding the modified cottonseed hull particles, uniformly mixing again, finally mixing the prepared sodium acrylate solution according to the mass ratio of 1:1, and adopting a step heating mode: reacting at 65 deg.C, 75 deg.C and 85 deg.C for 2.5h to obtain cottonseed hull particle solution containing graft resin, and keeping the temperature at 60 deg.C for use. Wherein, N' N-methylene-bisacrylamide accounts for 0.2wt% of the mass of the acrylamide aqueous solution, and potassium persulfate accounts for 1.5wt% of the mass of the acrylamide aqueous solution.
(4) Transferring the heat-insulated cottonseed hull particle solution containing the grafted resin to a flat-bottom pool with a layer of cotton non-woven fabric paved on the bottom surface, adjusting the height of the liquid level of the solution to 10cm from the bottom of the pool, naturally cooling for 20min, opening a floor drain on the bottom of the pool, filtering redundant water and resin solution which is not subjected to cross-linking reaction by using the cotton non-woven fabric, keeping the thickness of the cottonseed hull particle layer of the grafted resin uniform, drying by blowing hot air, and then stripping the non-woven fabric to obtain a primary water absorption layer made of the cottonseed hull particles.
(5) And (3) performing friction polishing on the primary water absorption layer by using abrasive paper, and finally repeatedly pressing and rolling the water absorption layer for 5 times by using a roller with the caliber of 100 cm.
Example 4
The embodiment discloses a preparation method of a water-absorbing non-woven fabric, which comprises the following steps:
(1) cotton which is not subjected to seed removal is subjected to cotton gin cotton extraction, and simultaneously the cotton amount of 18wt% of the surface of the cotton seed shell, namely 18% of the total mass of the cotton in the cotton seed shell, is reserved to obtain the cotton seeds; uniformly drying the cotton seeds, wherein the water content of the cotton seeds is 10%, repeatedly grinding the dried cotton seeds for 3 times, sieving, and screening out crushed cotton seed kernels, residues and a small amount of impurities to obtain cotton seed hull particles with cotton fibers at one end, wherein the particle size of the cotton seed hull particles is 1.0 mm.
(2) Adding the cottonseed hull particles into the mixture at a mass ratio of 1:1, and adding Na to the mixture at a temperature of 45 DEG C2SO3Na content of 50w%2SO3Adding chlorine to the aqueous solutionDissolving iron, spraying 5mol/L NaOH solution to adjust pH to 9, reacting at 110 deg.C for 3.5h, filtering, and rinsing the obtained cottonseed hull particles with clear water for 3 times. Wherein the ferric chloride is Na2SO31.2wt% of the aqueous solution.
(3) Preparing 20 wt% acrylic acid water solution diluted by water in advance, and regulating the neutralization degree to be 60% by adopting 5mol/L NaOH solution for later use; adding deionized water into an acrylamide monomer solution according to the material-to-liquid ratio of 1:8 for dilution, then sequentially adding a cross-linking agent N' N-methylene bisacrylamide and an initiator potassium persulfate, stirring and uniformly mixing, then adding the modified cottonseed hull particles, uniformly mixing again, finally mixing the prepared sodium acrylate solution according to the mass ratio of 1:1, and adopting a step heating mode: reacting at 65 deg.C, 75 deg.C and 85 deg.C for 2.5h to obtain cottonseed hull particle solution containing graft resin, and keeping the temperature at 60 deg.C for use. Wherein, N' N-methylene-bisacrylamide accounts for 0.1wt% of the mass of the acrylamide aqueous solution, and potassium persulfate accounts for 1.2wt% of the mass of the acrylamide aqueous solution.
(4) Transferring the heat-insulated cottonseed hull particle solution containing the grafted resin to a flat-bottom pool with a layer of cotton non-woven fabric paved on the bottom surface, adjusting the height of the liquid level of the solution to 10cm from the bottom of the pool, naturally cooling for 20min, opening a floor drain on the bottom of the pool, filtering redundant water and resin solution which is not subjected to cross-linking reaction by using the cotton non-woven fabric, keeping the thickness of the cottonseed hull particle layer of the grafted resin uniform, drying by blowing hot air, and then stripping the non-woven fabric to obtain a primary water absorption layer made of the cottonseed hull particles.
(5) And (3) performing friction polishing on the primary water absorption layer by using abrasive paper, and finally repeatedly pressing and rolling the water absorption layer for 10 times by using a roller with the caliber of 100 cm.
Example 5
The embodiment discloses a preparation method of a water-absorbing non-woven fabric, which comprises the following steps:
(1) cotton seeds which are not removed are subjected to cotton gin cotton extraction, and meanwhile, the cotton amount of 22wt% of the surface of the cotton seed hulls is kept, namely 22% of the total cotton mass in the cotton seed hulls, so that the cotton seeds are obtained; and uniformly airing the cotton seeds, wherein the water content of the cotton seeds is 8 percent, then repeatedly grinding and crushing the aired cotton seeds for 3 times, sieving, and screening out crushed cotton seed kernels, residues and a small amount of impurities to obtain cotton seed hull particles with cotton fibers at one end, wherein the particle size is 1.0 mm.
(2) Adding the cottonseed hull particles into the mixture at a mass ratio of 1:1, and adding Na into the mixture at a temperature of 40 DEG C2SO3Na content of 25w%2SO3Adding ferric chloride into the aqueous solution, spraying 5mol/L NaOH solution to adjust the pH value to 9, preserving the temperature at 120 ℃, reacting for 3.5h, filtering after the reaction is finished, and rinsing the obtained cottonseed hull particles for 3 times by using clear water. Wherein the ferric chloride is Na2SO31.5wt% of the aqueous solution.
(3) Preparing an acrylic acid aqueous solution with water dilution concentration of 15wt% in advance, and regulating the neutralization degree to be 60% by adopting a 5mol/L NaOH solution for later use; adding deionized water into an acrylamide monomer solution according to the material-to-liquid ratio of 1:9 for dilution, then sequentially adding a cross-linking agent N' N-methylene bisacrylamide and an initiator potassium persulfate, stirring and uniformly mixing, then adding the modified cottonseed hull particles, uniformly mixing again, finally mixing the prepared sodium acrylate solution according to the mass ratio of 1:1, and adopting a step heating mode: reacting at 65 deg.C, 75 deg.C and 85 deg.C for 2.5h to obtain cottonseed hull particle solution containing graft resin, and keeping the temperature at 60 deg.C for use. Wherein, N' N-methylene-bisacrylamide accounts for 0.1wt% of the mass of the acrylamide aqueous solution, and potassium persulfate accounts for 1.5wt% of the mass of the acrylamide aqueous solution.
(4) Transferring the heat-insulated cottonseed hull particle solution containing the grafted resin to a flat-bottom pool with a layer of cotton non-woven fabric paved on the bottom surface, adjusting the height of the liquid level of the solution to 10cm from the bottom of the pool, naturally cooling for 20min, opening a floor drain on the bottom of the pool, filtering redundant water and resin solution which is not subjected to cross-linking reaction by using the cotton non-woven fabric, keeping the thickness of the cottonseed hull particle layer of the grafted resin uniform, drying by blowing hot air, and then stripping the non-woven fabric to obtain a primary water absorption layer made of the cottonseed hull particles.
(5) And (3) performing friction polishing on the primary water absorption layer by using abrasive paper, and finally repeatedly pressing and rolling the water absorption layer for 5 times by using a roller with the caliber of 100 cm.
Example 6
The water-absorbent nonwoven fabric prepared in examples 1 to 5 of the present invention was stacked to a thickness of 3cm in a specification of 13cm × 7cm, and both sides of the fabric were covered with cotton nonwoven fabric, and the fabric was reinforced with cotton threads, and the water absorption capacity and water absorption rate were measured; and meanwhile, the absorption effect of the urine absorbent is detected, and the urine absorbent is compared with the common cotton cloth in the same specification on the market. The results are shown in table 1:
according to the result, the water-absorbing non-woven fabric can be obtained, and has good absorption capacity and absorption rate for water and urine by referring to a control group, the absorption rate of the water-absorbing non-woven fabric for 80mL of distilled water is up to 100%, and the time for absorbing 60mL of distilled water can be controlled within 15 s; the absorption rate for 80mL of urine is as high as 80mL, and the time for absorbing 60mL of urine can be controlled within 15 s.
Example 7
As shown in fig. 1 to 3, the present invention discloses a diaper based on the water-absorbent nonwoven fabric according to any one of embodiments 1 to 5, which comprises a skin-friendly layer 1, a water-absorbent nonwoven fabric layer 2, an isolation layer 3, an interlayer 6, and an outer surface layer 4 in this order from inside to outside. Two folding pieces 5 are arranged in the middle of the inner side of the skin-friendly layer 1, wherein one side of each folding piece 5 is bonded or sewn with the edge of the skin-friendly layer 1. The interlayer 6 is located between the barrier layer and the outer skin 4. The outer surface layer 4 is provided with pre-tearing lugs 7 and cutting lines 8. The cutting line 8 is wound in a shape of a circle to cut the outer surface layer 4 into a circle belt, the skin-friendly layer 1, the water-absorbing non-woven fabric layer 2, the isolation layer 3 and the outer surface layer 4 are sequentially compounded, preferably bonded and pressed, wherein the skin-friendly layer 1 is made of non-woven fabrics, and the isolation layer 3 is a polytetrafluoroethylene film in a preferred scheme. In some paper diapers, a flow guide layer is compounded between the water absorption type non-woven fabric layer 2 and the skin-friendly layer 1.
The invention has the following use modes: the skin-friendly layer 1 is simultaneously opposite to the buttocks and the pudendum of the baby, the outer surface layer 4 faces outwards, and the waistband position of the outer surface layer 4 is fixed around the waist of the baby and can be used as a normal paper diaper.
The second use mode: after the two folding sheets 5 on the skin-friendly layer 1 are turned outwards, the paper diaper is folded in half to form a U-shaped structure, the waistbands of the outer surface layer 4 are connected into a ring shape, and finally the two folding sheets 5 are respectively stuck on the outer surface layer 4 to form a cap-shaped structure, so that the paper diaper can be used as a simple cap.
The use method is as follows: be equipped with cutting line 8 on external top layer 4, 8 shape circles around and cuts apart out a shape area of returning with external top layer 4 middle part, and equidistant rectangle apertures that are equipped with the equidimension are gone up to cutting line 8.
The use method is as follows: when the bandage is needed, the clip tape can be easily torn along the cutting line 8 to be used as the bandage. When the baby needs cleaning after excretion, the pre-tearing ear 7 can be directly pulled open to take out the wet tissue and the dry tissue, the wet tissue is soaked with a mixed solution of stemonine, acetic acid and sodium chloride, the solution can effectively kill eggs laid by animals such as pinworms in the enterobacter genus of the tipinidae family of the ascariales in the vicinity of the anus of the baby, meanwhile, the pH value is weak acid and is close to the pH value of the skin of the baby, the skin of the baby cannot be injured, and the dry tissue is used for cleaning and absorbing the solution remained on the skin of the baby on the wet tissue.
In some embodiments, the skin-friendly layer and the folded sheet are made of the same material and are both hot-rolled non-woven fabrics.
In some embodiments, the barrier layer and the outer surface layer are both polypropylene films or hot-rolled non-woven polyethylene composite base films.
In conclusion, with the paper diaper provided by the invention, when a baby carelessly discards or dirties his own cap and does not have a cap to wear, the folding sheet can be unfolded to be worn as a temporary cap; when the excretion of the baby is completed, the guardian can directly pull the pre-tearing ear open to take out the paper towel in the interlayer to complete the wiping and cleaning work; after the baby is accidentally injured, the cutting line on the paper diaper can be used for tearing to obtain a clip-shaped belt for temporarily wrapping the baby to prevent further infection.
Furthermore, the folding sheet is made of non-woven fabric, so that ventilation is reduced and the warm-keeping effect is improved when the folding sheet is used as a hat; the paper towel is divided into wet paper towel and dry paper towel, wherein the wet paper towel is soaked with mixed solution of stemonine, acetic acid and sodium chloride, the solution can effectively kill eggs produced by animals such as pinworm in the genus of intestinal nematode of the family Endocarpium of the family of Endocarpium ascariaceae in the vicinity of anus of the infant, meanwhile, the pH value is weakly acidic and is close to the pH value of the skin of the infant, the skin of the infant cannot be injured, and the dry paper towel is used for cleaning and absorbing the solution remained on the skin of the infant on the wet paper towel.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A preparation method of water-absorbing non-woven fabric is characterized by comprising the following steps:
(1) cotton without seeds is taken as a raw material, and cotton seeds are obtained by cotton pumping;
(2) airing the cottonseed to enable the water content of the cottonseed to be less than or equal to 10 wt%; repeatedly grinding and crushing the aired cottonseed for 3-5 times, and sieving to obtain cottonseed hull particles with cotton fibers;
(3) adding the cottonseed hull particles into the mixture at a mass ratio of 1:1, and adding Na into the mixture at a temperature of 40-50 DEG C2SO3Na in an amount of 15 to 50 wt%2SO3Adding ferric chloride serving as a catalyst into the aqueous solution, adjusting the pH to 9-10, preserving the temperature at 90-120 ℃, reacting for 3.5-4.5 h, filtering after the reaction is finished, and rinsing the obtained cottonseed hull particles for 2-3 times by using clear water;
(4) preparing an acrylic acid aqueous solution which is diluted by adding water to a concentration of 10-20 wt% in advance, and adjusting the neutralization degree to 60% by adopting a 5mol/L NaOH solution;
(5) adding deionized water into an acrylamide monomer according to the material-liquid ratio of 1: 8-10 for dilution to obtain an acrylamide aqueous solution, then sequentially adding N' N-methylene bisacrylamide and potassium persulfate, stirring and uniformly mixing, adding the cottonseed hull particles obtained in the step (3), uniformly mixing again, finally mixing into the sodium acrylate solution obtained in the step (4) according to the mass ratio of 1:1, and adopting a step heating mode: respectively reacting at 65 ℃, 75 ℃ and 85 ℃ for 1.5-2.5 h under heat preservation to obtain a grafted cottonseed hull particle solution, and preserving heat at 60-70 ℃ for later use;
(6) transferring the cottonseed hull particle solution grafted in the step (5) into a flat-bottom pool with a layer of cotton non-woven fabric paved on the bottom surface, adjusting the height of the liquid level of the solution to be 5-10 cm from the bottom of the pool, naturally cooling for 20-30 min, opening a floor drain on the bottom of the pool, filtering redundant water and resin solution which is not subjected to cross-linking reaction by using the cotton non-woven fabric, drying by blowing hot air, and then stripping the non-woven fabric to obtain primary water absorbent cloth made of the cottonseed hull particles;
(7) and (3) performing friction polishing on the primary water absorption layer by using abrasive paper, and finally repeatedly pressing and rolling the water absorption cloth for 5-10 times by using a roller with the caliber of 50-100 cm to obtain the water absorption type non-woven fabric.
2. The method for producing a water-absorbent nonwoven fabric according to claim 1, characterized in that: the preparation method of the cotton seeds in the step (1) comprises the step of carrying out cotton ginning and cotton drawing on cotton without removing the seeds, and keeping the cotton amount of 15-25 wt% of the surface of the cotton seed hulls.
3. The method for producing a water-absorbent nonwoven fabric according to claim 1, characterized in that: the particle size of the cottonseed hull particles is 0.5-1.0 mm.
4. The method for producing a water-absorbent nonwoven fabric according to claim 1, characterized in that: in the step (3), the ferric chloride is Na2SO31-2 wt% of the aqueous solution.
5. The method for producing a water-absorbent nonwoven fabric according to claim 1, characterized in that: in the step (5), N' N-methylene bisacrylamide accounts for 0.1-0.2 wt% of the mass of the acrylamide aqueous solution, and potassium persulfate accounts for 1.0-1.5 wt% of the mass of the acrylamide aqueous solution.
6. A water-absorbent nonwoven fabric produced by the method for producing a water-absorbent nonwoven fabric according to any one of claims 1 to 5.
7. A diaper based on the water-absorbent nonwoven fabric according to claim 6, characterized in that: the skin-friendly water-absorbing type fabric comprises a skin-friendly layer, a water-absorbing type non-woven fabric layer, an isolation layer, an interlayer and an external surface layer from inside to outside in sequence; two folding pieces are arranged in the middle of the skin-friendly layer, wherein one side of each folding piece is fixedly connected with the edge of the skin-friendly layer; the interlayer is positioned between the isolation layer and the outer surface layer; the external surface layer is provided with a pre-tearing ear and the middle part is provided with a cutting line; the cutting line is wound in a shape of a square-circle to cut an outer surface layer into a square-circle belt structure.
8. The water-absorbent nonwoven fabric diaper according to claim 7, characterized in that: the skin-friendly layer and the folding sheet are made of the same material and are both hot-rolled non-woven fabrics.
9. The water-absorbent nonwoven fabric diaper according to claim 7, characterized in that: the isolation layer includes a polytetrafluoroethylene membrane.
10. The water-absorbent nonwoven fabric diaper according to claim 7, characterized in that: the isolation layer and the external surface layer are both polypropylene films or hot-rolled non-woven material polyethylene composite basement membranes.
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| CN102094294B (en) * | 2010-12-17 | 2012-10-03 | 沈阳天荣电缆材料有限公司 | Reinforced nonwoven fabric and production method thereof |
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