CN113550073A - High-water-absorption medical non-woven composite material and preparation method thereof - Google Patents
High-water-absorption medical non-woven composite material and preparation method thereof Download PDFInfo
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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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/007—Addition polymers
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- 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
- A61L15/18—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
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- 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
- A61L15/20—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
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- 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
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- 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
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- 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
- A61L15/42—Use of materials characterised by their function or physical properties
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- 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
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/44—Medicaments
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- 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
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/36—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising unsaturated carboxylic acids or unsaturated organic esters as the major constituent
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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
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/12—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with filaments or yarns secured together by chemical or thermo-activatable bonding agents, e.g. adhesives, applied or incorporated in liquid or solid form
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- A—HUMAN NECESSITIES
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- 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
- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/10—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices containing or releasing inorganic materials
- A61L2300/102—Metals or metal compounds, e.g. salts such as bicarbonates, carbonates, oxides, zeolites, silicates
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- A—HUMAN NECESSITIES
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- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
- A61L2300/412—Tissue-regenerating or healing or proliferative agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
- A61L2300/418—Agents promoting blood coagulation, blood-clotting agents, embolising agents
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Abstract
The invention discloses a medical non-woven composite material with high water absorption and a preparation method thereof. The method comprises the steps of pretreating montmorillonite, mixing the pretreated montmorillonite with an acid-base solution, stirring, filtering and drying to obtain refined montmorillonite, mixing the refined montmorillonite with hexadecyl dimethyl benzyl ammonium chloride, stirring for reaction, drying to obtain modified montmorillonite, mixing acrylic acid with chitin, stirring for reaction to obtain modified chitin, mixing the modified montmorillonite with the modified chitin, adding a cross-linking agent for stirring for reaction, extruding into a potassium hydroxide solution, aging, washing, drying and grinding to obtain synthetic resin, and mixing the synthetic resin with synthetic fibers to obtain the medical non-woven composite material with high water absorption. The medical non-woven composite material with high water absorption prepared by the invention has strong water absorption and excellent mechanical property.
Description
Technical Field
The invention relates to the technical field of fabrics, in particular to a medical non-woven composite material with high water absorption and a preparation method thereof.
Background
The high water absorption synthetic resin is a resin-like functional polymer material, and can absorb water with the weight of tens to thousands of times. Compared with the traditional water absorbing materials such as absorbent cotton and cellulose fiber, the water absorbing material has strong water absorbing capacity and water retention, and almost does not lose water even under the action of high external pressure. In terms of morphology, superabsorbent synthetic resins are another new type of functional composite materials made from powdered or granular superabsorbent resins.
Acrylic polymers contain a large number of hydrophilic groups and are one of the important raw materials for the preparation of super absorbent resins. Vinyl monomer containing shuttle group, light group and phthalein amido is copolymerized with acrylic acid, and then is spun and formed to obtain the polyacrylic acid high water absorption composite material with excellent water absorption and salt water absorption.
The highly water-absorbent synthetic resin is suitable for use as disposable diapers, sanitary napkins, medical dressings, etc. because of its excellent water-absorbing, water-retaining, ammonia-absorbing, etc. properties. It can not only make the sanitary article keep faster and stronger water absorption, but also make the above-mentioned product thinner and softer, and has no granular substance to leak out, and can prevent or reduce skin eczema, etc.
Disclosure of Invention
The invention aims to provide a medical non-woven composite material with high water absorption and a preparation method thereof, and aims to solve the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme: the medical non-woven composite material with high water absorption is characterized by mainly comprising 30-45 parts by weight of synthetic resin, 30-45 parts by weight of water-absorbing fiber and 5-8 parts by weight of cross-linking agent.
The synthetic resin is prepared from modified montmorillonite and a modified chitin solution, the modified montmorillonite is prepared by blending hexadecyl dimethyl benzyl ammonium chloride and refined montmorillonite, and the modified chitin is prepared by blending acrylic acid and a chitin solution;
preferably, the water-absorbing fiber is prepared by blending acrylic acid and acrylamide.
Preferably, the cross-linking agent is one or a mixture of more of m-phenylenediamine, formaldehyde, epichlorohydrin and glutaraldehyde.
As optimization, the medical high-water-absorptivity non-woven composite material mainly comprises the following raw material components in parts by weight: 40 parts of synthetic resin, 40 parts of water-absorbing fiber and 8 parts of cross-linking agent.
As optimization, the medical non-woven composite material with high water absorption and the preparation method thereof mainly comprise the following preparation steps:
(1) putting the pretreated montmorillonite into a sodium hydroxide solution, stirring, performing suction filtration to obtain a filter cake, washing the filter cake to be neutral, drying, and grinding to obtain refined montmorillonite; acidifying refined montmorillonite with acetic acid, centrifuging to remove impurities, and preparing into montmorillonite slurry; mixing hexadecyl dimethyl benzyl ammonium chloride with absolute ethyl alcohol, stirring uniformly, adding into the montmorillonite slurry, stirring, drying, and calcining to obtain modified montmorillonite;
(2) mixing acrylic acid and chitin solution in a beaker, adding deionized water and potassium sulfate in the beaker, and stirring for reaction to obtain modified chitin solution;
(3) mixing the modified montmorillonite obtained in the step (1) with the modified chitin solution obtained in the step (2), stirring at a high speed, adding a cross-linking agent, stirring for reaction to obtain a synthetic resin blank, extruding the synthetic resin blank into a potassium hydroxide solution, aging, drying, and grinding to obtain synthetic resin;
(4) and (3) blending acrylic acid and acrylamide, adding into deionized water, stirring, adding potassium sulfate, heating, stirring, standing, defoaming, performing injection molding, curing to obtain synthetic fibers, bonding the synthetic resin obtained in the step (3) and the synthetic fibers together through a bonding agent, cutting, and sewing to obtain the medical non-woven composite material with high water absorption.
As optimization, the medical non-woven composite material with high water absorption and the preparation method thereof mainly comprise the following preparation steps:
(1) mixing the pretreated montmorillonite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30 minutes at 25 ℃, then carrying out suction filtration to obtain a pretreated montmorillonite filter cake, washing the pretreated montmorillonite filter cake with deionized water for 3 times, drying at 200 ℃ for 6 hours, grinding to obtain refined montmorillonite with the particle size of 200-300 nm, and mixing the refined montmorillonite with an acetic acid solution with the mass fraction of 0.2% in a mass ratio of 1: 1, mixing, stirring at 300rpm for 2 hours at 25 ℃, carrying out suction filtration to obtain an acidified montmorillonite filter cake, washing the acidified montmorillonite filter cake with deionized water for 3 times, and drying the obtained product for 24 hours at 25 ℃ to obtain a montmorillonite blank; mixing hexadecyl dimethyl benzyl ammonium chloride and absolute ethyl alcohol according to a mass ratio of 2: 1, mixing, stirring for 30 minutes at the rotating speed of 3000rpm to obtain an active agent solution, and mixing the montmorillonite blank and the active agent solution according to the mass ratio of 1: 0.2-1: 0.3, mixing, stirring at 300rpm for 2 hours at 25 ℃, drying at 105 ℃ for 12 hours, and then roasting at 350 ℃ for 2 hours to obtain modified montmorillonite;
(2) mixing acrylic acid and chitin solution according to the mass ratio of 1: 0.5-1: 2, mixing the mixture in a beaker, adding deionized water with the mass of 1 time of that of the chitin solution and potassium sulfate as an initiator with the mass of 0.1 time of that of the chitin solution into the beaker, stirring the mixture for 2 hours at the rotating speed of 350rpm at the temperature of 25 ℃, and polymerizing the mixture for 5 hours at the temperature of 70 ℃ to obtain a modified chitin solution;
(3) dispersing modified montmorillonite in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing montmorillonite slurry with the mass fraction of 3%, and mixing the montmorillonite slurry with the modified chitin solution according to the mass ratio of 1: 1-1: 1.2, mixing, stirring at 500rpm for 3 hours at 25 ℃, adding a cross-linking agent formaldehyde which is 0.1-0.2 time of the mass of the modified montmorillonite, stirring at 500rpm for 1 hour at 25 ℃ to obtain a synthetic resin blank, extruding the synthetic resin blank into a potassium hydroxide solution with the mass of the synthetic resin blank being 10, and aging for 24 hours to obtain synthetic resin;
(4) mixing acrylic acid and acrylamide according to a mass ratio of 1: 1, adding the mixture into deionized water with 5 times of the mass of acrylic acid, adding sodium hydroxide with 0.1 time of the mass of acrylic acid, stirring for 2 hours at the rotating speed of 350rpm, adding potassium sulfate with 0.2 time of the mass of acrylic acid, stirring for 3 hours at the rotating speed of 600rpm at 80 ℃, standing for 2 hours at 25 ℃, pouring the mixture into a mold, curing for 12 hours, demolding to obtain synthetic fibers, and mixing the synthetic fibers and synthetic resin by using a bonding agent with 0.2 time of the mass of the synthetic fibers according to the mass ratio of 1: 1, sticking, cutting and sewing to obtain the medical non-woven composite material with high water absorption.
Preferably, the preparation method of the pretreated montmorillonite in the step (1) is to roast the montmorillonite at the temperature of 260-300 ℃ for 2 hours, cool the montmorillonite to 25 ℃, put the montmorillonite into a grinder to be ground for 3 hours, and then pass through a 200-mesh sieve to obtain the pretreated montmorillonite.
As optimization, the chitin solution in the step (2) is prepared by mixing chitin and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 3: 100-4: 100 are mixed and prepared.
And (3) optimally, the potassium hydroxide solution used in the step (3) is a potassium hydroxide solution with the mass fraction of 0.3-0.45%.
Compared with the prior art, the invention has the following beneficial effects:
the invention uses synthetic resin when preparing medical non-woven composite material with high water absorption, and combines the synthetic resin with water absorption fiber. Firstly, chitin is grafted by acrylic acid to obtain modified chitin, and then the modified montmorillonite and the modified chitin are blended to obtain synthetic resin, because the montmorillonite is activated by hexadecyl dimethyl benzyl ammonium chloride to enable a crystal structure layer of the montmorillonite to contain rich free cations, the modified montmorillonite has strong cation adsorption, can be combined with positively charged modified chitin and forms a stable cross-linked body under the action of a cross-linking agent, the cross-linked body exists in the synthetic resin in a three-dimensional network structure form to promote the water absorption of a composite material, and because of the existence of the modified chitin in the synthetic resin, the synthetic resin has good ion exchange effect, the effect enables water molecules to enter a crystal layer of the synthetic fiber to cause the expansion of the synthetic resin caused by the introduction of the water molecules, the spacing between the crystal layers of the synthetic resin is increased, and the capacity of the synthetic resin for adsorbing non-structural water is promoted, further improving the water absorption of the composite material.
Secondly, acrylic acid and acrylamide are copolymerized to form water-absorbing fibers, then the water-absorbing fibers are bonded on the outer side of the synthetic resin through a bonding agent to form the composite material, water molecules diffuse towards the inner side of the synthetic resin under the action of hydrophilic groups of the composite material, carboxylic acid metal ion groups in the synthetic resin are dissociated when meeting water, so that the concentration of metal ions in the three-dimensional network structure is increased, osmotic pressure is generated inside and outside the synthetic resin, the cross-linked structure is promoted to be further stretched, water molecules are further pushed to flow into the composite material, the solvation effect of the composite material and the water molecules is increased, and the water absorption of the composite material is promoted.
Finally, when the temperature rises, the long chain of the copolymer formed by the acrylamide and the acrylic acid is broken, so that the water locking performance of the composite material is reduced, and water molecules are evaporated from a three-dimensional structure to take away a large amount of heat, so that the composite material has excellent heat protection function and air permeability; in addition, the composite material is in a gel state after absorbing water, water cannot flow out even if the composite material is pressurized, and the modified montmorillonite exists in a lamellar arrangement structure in the cross-linked body, so that the composite material has good mechanical property and good water retention property, when the composite material is contacted with wound exudate, the synthetic resin can release calcium ions, so that the formation of a prothrombin activator is promoted, the blood coagulation process is accelerated, calcium ions and sodium ions can be exchanged with the exudate at the same time, a layer of stable reticular gel is formed on the surface of a wound, a microenvironment which is beneficial to growth prevention is created for the wound, nerve endings are protected, the wound adhesion is prevented, and the carboxylic acid in the composite material after absorbing water is hydrolyzed to be acidic, so that neutral particles in blood can play a role, and the wound healing is promoted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
In order to more clearly illustrate the method provided by the present invention, the following examples are used to illustrate the method for testing the high water absorption medical nonwoven composite material prepared in the following examples, wherein the method for testing each index is as follows:
mechanical properties: the high water-absorbent medical nonwoven composite material obtained in each example and the product obtained in the comparative example were cut into a material having a thickness of 15mm, and the compressive strength was measured.
Water absorption performance: the high water-absorbent medical nonwoven composite material obtained in each example and the product obtained in the comparative example were put in a humid environment for 2 days, and then the respective moisture absorption rates were calculated.
Example 1
A medical non-woven composite material with high water absorption mainly comprises 40 parts of synthetic resin, 40 parts of water absorption fiber and 8 parts of cross-linking agent according to parts by weight.
A preparation method of a medical non-woven composite material with high water absorption mainly comprises the following preparation steps:
(1) mixing the pretreated montmorillonite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30 minutes at 25 ℃, then carrying out suction filtration to obtain a pretreated montmorillonite filter cake, washing the pretreated montmorillonite filter cake with deionized water for 3 times, drying at 200 ℃ for 6 hours, grinding to obtain refined montmorillonite with the particle size of 300nm, mixing the refined montmorillonite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2 hours at 25 ℃, carrying out suction filtration to obtain an acidified montmorillonite filter cake, washing the acidified montmorillonite filter cake with deionized water for 3 times, and drying the obtained product for 24 hours at 25 ℃ to obtain a montmorillonite blank; mixing hexadecyl dimethyl benzyl ammonium chloride and absolute ethyl alcohol according to a mass ratio of 2: 1, mixing, stirring for 30 minutes at the rotating speed of 3000rpm to obtain an active agent solution, and mixing the montmorillonite blank and the active agent solution according to the mass ratio of 1: 0.3, mixing, stirring at 300rpm for 2 hours at 25 ℃, drying at 105 ℃ for 12 hours, and then roasting at 350 ℃ for 2 hours to obtain modified montmorillonite;
(2) mixing acrylic acid and chitin solution according to the mass ratio of 1: 2, mixing the mixture in a beaker, adding deionized water with the mass of 1 time of that of the chitin solution and potassium sulfate as an initiator with the mass of 0.1 time of that of the chitin solution into the beaker, stirring the mixture for 2 hours at the rotating speed of 350rpm at the temperature of 25 ℃, and polymerizing the mixture for 5 hours at the temperature of 70 ℃ to obtain a modified chitin solution;
(3) dispersing modified montmorillonite in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing montmorillonite slurry with the mass fraction of 3%, and mixing the montmorillonite slurry with the modified chitin solution according to the mass ratio of 1: 1.2, mixing, stirring at 500rpm for 3 hours at 25 ℃, adding a cross-linking agent formaldehyde which is 0.2 time of the mass of the modified montmorillonite, stirring at 500rpm for 1 hour at 25 ℃ to obtain a synthetic resin blank, extruding the synthetic resin blank into a potassium hydroxide solution with the mass of the synthetic resin blank of 10, and aging for 24 hours to obtain synthetic resin;
(4) mixing acrylic acid and acrylamide according to a mass ratio of 1: 1, adding the mixture into deionized water with the mass 5 times that of acrylic acid, adding sodium hydroxide with the mass 0.1 time that of the acrylic acid, stirring for 2 hours at the rotating speed of 350rpm, adding potassium sulfate with the mass 0.2 time that of the acrylic acid, stirring for 3 hours at the rotating speed of 600rpm at the temperature of 80 ℃, standing for 2 hours at the temperature of 25 ℃, pouring the mixture into a mold, curing for 12 hours, demolding to obtain synthetic fibers, and mixing the synthetic fibers with the synthetic resin obtained in the step (3) by using a bonding agent with the mass 0.2 time that of the synthetic fibers according to a mass ratio of 1: 1, sticking, cutting and sewing to obtain the medical non-woven composite material with high water absorption.
Preferably, the preparation method of the pretreated montmorillonite in the step (1) is to bake the montmorillonite at the temperature of 300 ℃ for 2 hours, cool the montmorillonite to 25 ℃, put the montmorillonite into a pulverizer to pulverize for 3 hours, and then pass through a 200-mesh sieve to obtain the pretreated montmorillonite.
As optimization, the chitin solution in the step (2) is prepared by mixing chitin and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 4: 100 are mixed and prepared.
Preferably, the potassium hydroxide solution used in the step (3) is a potassium hydroxide solution with the mass fraction of 0.3%.
Example 2
A medical non-woven composite material with high water absorption mainly comprises 40 parts of synthetic resin, 40 parts of water absorption fiber and 8 parts of cross-linking agent according to parts by weight.
A preparation method of a medical non-woven composite material with high water absorption mainly comprises the following preparation steps:
(1) mixing the pretreated montmorillonite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30 minutes at 25 ℃, then carrying out suction filtration to obtain a pretreated montmorillonite filter cake, washing the pretreated montmorillonite filter cake with deionized water for 3 times, drying at 200 ℃ for 6 hours, grinding to obtain refined montmorillonite with the particle size of 300nm, mixing the refined montmorillonite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2 hours at 25 ℃, carrying out suction filtration to obtain an acidified montmorillonite filter cake, washing the acidified montmorillonite filter cake with deionized water for 3 times, and drying the obtained product for 24 hours at 25 ℃ to obtain a montmorillonite blank;
(2) mixing acrylic acid and chitin solution according to the mass ratio of 1: 2, mixing the mixture in a beaker, adding deionized water with the mass of 1 time of that of the chitin solution and potassium sulfate as an initiator with the mass of 0.1 time of that of the chitin solution into the beaker, stirring the mixture for 2 hours at the rotating speed of 350rpm at the temperature of 25 ℃, and polymerizing the mixture for 5 hours at the temperature of 70 ℃ to obtain a modified chitin solution;
(3) dispersing the montmorillonite blank in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing montmorillonite slurry with the mass fraction of 3%, and mixing the montmorillonite slurry with the modified chitin solution according to the mass ratio of 1: 1.2 mixing, stirring at 500rpm for 3 hours at 25 ℃, adding a cross-linking agent formaldehyde which is 0.2 time of the mass of the montmorillonite blank, stirring at 500rpm for 1 hour at 25 ℃ to obtain a synthetic resin blank, extruding the synthetic resin blank into a potassium hydroxide solution with the mass of the synthetic resin blank of 10, and aging for 24 hours to obtain synthetic resin;
(4) mixing acrylic acid and acrylamide according to a mass ratio of 1: 1, adding the mixture into deionized water with the mass 5 times that of acrylic acid, adding sodium hydroxide with the mass 0.1 time that of the acrylic acid, stirring for 2 hours at the rotating speed of 350rpm, adding potassium sulfate with the mass 0.2 time that of the acrylic acid, stirring for 3 hours at the rotating speed of 600rpm at the temperature of 80 ℃, standing for 2 hours at the temperature of 25 ℃, pouring the mixture into a mold, curing for 12 hours, demolding to obtain synthetic fibers, and mixing the synthetic fibers with the synthetic resin obtained in the step (3) by using a bonding agent with the mass 0.2 time that of the synthetic fibers according to a mass ratio of 1: 1, sticking, cutting and sewing to obtain the medical non-woven composite material with high water absorption.
Preferably, the preparation method of the pretreated montmorillonite in the step (1) is to bake the montmorillonite at the temperature of 300 ℃ for 2 hours, cool the montmorillonite to 25 ℃, put the montmorillonite into a pulverizer to pulverize for 3 hours, and then pass through a 200-mesh sieve to obtain the pretreated montmorillonite.
As optimization, the chitin solution in the step (2) is prepared by mixing chitin and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 4: 100 are mixed and prepared.
Preferably, the potassium hydroxide solution used in the step (3) is a potassium hydroxide solution with the mass fraction of 0.3%.
Example 3
A medical non-woven composite material with high water absorption mainly comprises 40 parts of synthetic resin, 40 parts of water absorption fiber and 8 parts of cross-linking agent according to parts by weight.
A preparation method of a medical non-woven composite material with high water absorption mainly comprises the following preparation steps:
(1) mixing the pretreated montmorillonite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30 minutes at 25 ℃, then carrying out suction filtration to obtain a pretreated montmorillonite filter cake, washing the pretreated montmorillonite filter cake with deionized water for 3 times, drying at 200 ℃ for 6 hours, grinding to obtain refined montmorillonite with the particle size of 300nm, mixing the refined montmorillonite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2 hours at 25 ℃, carrying out suction filtration to obtain an acidified montmorillonite filter cake, washing the acidified montmorillonite filter cake with deionized water for 3 times, and drying the obtained product for 24 hours at 25 ℃ to obtain a montmorillonite blank; mixing hexadecyl dimethyl benzyl ammonium chloride and absolute ethyl alcohol according to a mass ratio of 2: 1, mixing, stirring for 30 minutes at the rotating speed of 3000rpm to obtain an active agent solution, and mixing the montmorillonite blank and the active agent solution according to the mass ratio of 1: 0.3, mixing, stirring at 300rpm for 2 hours at 25 ℃, drying at 105 ℃ for 12 hours, and then roasting at 350 ℃ for 2 hours to obtain modified montmorillonite;
(2) dispersing modified montmorillonite in water, adjusting pH to 4 with 5% acetic acid to obtain 3% montmorillonite slurry, and mixing the montmorillonite slurry and chitin solution at a mass ratio of 1: 1.2, mixing, stirring at 500rpm for 3 hours at 25 ℃, adding a cross-linking agent formaldehyde which is 0.2 time of the mass of the modified montmorillonite, stirring at 500rpm for 1 hour at 25 ℃ to obtain a synthetic resin blank, extruding the synthetic resin blank into a potassium hydroxide solution with the mass of the synthetic resin blank of 10, and aging for 24 hours to obtain synthetic resin;
(3) mixing acrylic acid and acrylamide according to a mass ratio of 1: 1, adding the mixture into deionized water with the mass 5 times that of acrylic acid, adding sodium hydroxide with the mass 0.1 time that of the acrylic acid, stirring for 2 hours at the rotating speed of 350rpm, adding potassium sulfate with the mass 0.2 time that of the acrylic acid, stirring for 3 hours at the rotating speed of 600rpm at the temperature of 80 ℃, standing for 2 hours at the temperature of 25 ℃, pouring the mixture into a mold, curing for 12 hours, demolding to obtain synthetic fibers, and mixing the synthetic fibers with the synthetic resin obtained in the step (2) by using a bonding agent with the mass 0.2 time that of the synthetic fibers according to a mass ratio of 1: 1, sticking, cutting and sewing to obtain the medical non-woven composite material with high water absorption.
Preferably, the preparation method of the pretreated montmorillonite in the step (1) is to bake the montmorillonite at the temperature of 300 ℃ for 2 hours, cool the montmorillonite to 25 ℃, put the montmorillonite into a pulverizer to pulverize for 3 hours, and then pass through a 200-mesh sieve to obtain the pretreated montmorillonite.
As optimization, the chitin solution in the step (2) is prepared by mixing chitin and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 4: 100 are mixed and prepared.
Preferably, the potassium hydroxide solution used in the step (2) is a potassium hydroxide solution with the mass fraction of 0.3%.
Comparative example
A medical non-woven composite material with high water absorption mainly comprises 40 parts of synthetic resin, 40 parts of water absorption fiber and 8 parts of cross-linking agent according to parts by weight.
A preparation method of a medical non-woven composite material with high water absorption mainly comprises the following preparation steps:
(1) mixing the pretreated montmorillonite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30 minutes at 25 ℃, then carrying out suction filtration to obtain a pretreated montmorillonite filter cake, washing the pretreated montmorillonite filter cake with deionized water for 3 times, drying at 200 ℃ for 6 hours, grinding to obtain refined montmorillonite with the particle size of 300nm, mixing the refined montmorillonite with an acetic acid solution with the mass fraction of 0.2% according to the mass ratio of 1: 1, mixing, stirring at 300rpm for 2 hours at 25 ℃, carrying out suction filtration to obtain an acidified montmorillonite filter cake, washing the acidified montmorillonite filter cake with deionized water for 3 times, and drying the obtained product for 24 hours at 25 ℃ to obtain a montmorillonite blank;
(2) dispersing modified montmorillonite in water, adjusting pH to 4 with 5% acetic acid to obtain 3% montmorillonite slurry, and mixing the montmorillonite slurry and chitin solution at a mass ratio of 1: 1.2, mixing, stirring at 500rpm for 3 hours at 25 ℃, adding a cross-linking agent formaldehyde which is 0.2 time of the mass of the modified montmorillonite, stirring at 500rpm for 1 hour at 25 ℃ to obtain a synthetic resin blank, extruding the synthetic resin blank into a potassium hydroxide solution with the mass of the synthetic resin blank of 10, and aging for 24 hours to obtain synthetic resin;
(3) mixing acrylic acid and acrylamide according to a mass ratio of 1: 1, adding the mixture into deionized water with the mass 5 times that of acrylic acid, adding sodium hydroxide with the mass 0.1 time that of the acrylic acid, stirring for 2 hours at the rotating speed of 350rpm, adding potassium sulfate with the mass 0.2 time that of the acrylic acid, stirring for 3 hours at the rotating speed of 600rpm at the temperature of 80 ℃, standing for 2 hours at the temperature of 25 ℃, pouring the mixture into a mold, curing for 12 hours, demolding to obtain synthetic fibers, and mixing the synthetic fibers with the synthetic resin obtained in the step (2) by using a bonding agent with the mass 0.2 time that of the synthetic fibers according to a mass ratio of 1: 1, sticking, cutting and sewing to obtain the medical non-woven composite material with high water absorption.
Preferably, the preparation method of the pretreated montmorillonite in the step (1) is to bake the montmorillonite at the temperature of 300 ℃ for 2 hours, cool the montmorillonite to 25 ℃, put the montmorillonite into a pulverizer to pulverize for 3 hours, and then pass through a 200-mesh sieve to obtain the pretreated montmorillonite.
As optimization, the chitin solution in the step (2) is prepared by mixing chitin and an acetic acid solution with the mass fraction of 3% according to the mass ratio of 4: 100 are mixed and prepared.
Preferably, the potassium hydroxide solution used in the step (2) is a potassium hydroxide solution with the mass fraction of 0.3%.
Examples of effects
The following table 1 shows the results of performance analysis of a high water-absorbent medical nonwoven composite material using examples 1 to 3 of the present invention and a comparative example.
TABLE 1
From the comparison of the experimental data of example 1 and comparative example 1 in table 1, it can be found that the mechanical properties and the water resistance of the medical non-woven composite material with high water absorption prepared in example 1 are stronger than those of the medical non-woven composite material with high water absorption prepared in comparative example 1, which indicates that the mechanical properties and the water resistance of the product can be effectively improved when the modified montmorillonite and the modified chitin solution are added during the preparation of the medical non-woven composite material with high water absorption; from the comparison of the experimental data of example 1 and example 2, it can be found that the mechanical properties and the waterproof properties of the medical non-woven material with high water absorption prepared in example 1 are stronger than those of the waterproof allochroic coating for glass prepared in example 2, which indicates that the montmorillonite is not modified in the medical non-woven material with high water absorption, so that the interfacial bonding force between the montmorillonite and the chitin and acrylamide matrix is reduced, and the water absorption and the mechanical properties of the product are reduced; from the comparison of the experimental data of example 1 and example 3, it can be found that the mechanical properties of the medical non-woven composite material with high water absorption prepared in example 1 are stronger than those of the medical non-woven composite material with high water absorption prepared in example 3, which indicates that the synthetic resin is not uniformly dispersed in the product by using the unmodified chitin solution when the medical non-woven composite material with high water absorption is prepared, so that the mechanical properties of the product are remarkably reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The medical non-woven composite material with high water absorption is characterized by mainly comprising 30-45 parts by weight of synthetic resin, 30-45 parts by weight of water-absorbing fiber and 5-8 parts by weight of cross-linking agent.
2. The medical non-woven composite material with high water absorption and the preparation method thereof as claimed in claim 1, wherein the synthetic resin is prepared by blending modified montmorillonite and modified chitin solution, and the water-absorbing fiber is prepared by blending acrylic acid and acrylamide.
3. The medical non-woven composite material with high water absorption and the preparation method thereof as claimed in claim 2, wherein the modified chitin is prepared by blending acrylic acid and chitin solution, and the modified montmorillonite is prepared by blending hexadecyl dimethyl benzyl ammonium chloride and refined montmorillonite.
4. The medical non-woven composite material with high water absorption and the preparation method thereof according to claim 3, wherein the cross-linking agent is one or a mixture of m-phenylenediamine, formaldehyde, epichlorohydrin and glutaraldehyde.
5. The medical non-woven composite material with high water absorption and the preparation method thereof as claimed in the claim, wherein the medical non-woven composite material with high water absorption mainly comprises the following raw material components in parts by weight: 45 parts of synthetic resin, 45 parts of water-absorbent fiber and 8 parts of crosslinking agent.
6. A medical non-woven composite material with high water absorption and a preparation method thereof are characterized by mainly comprising the following preparation steps:
(1) putting the pretreated montmorillonite into a sodium hydroxide solution, stirring, performing suction filtration to obtain a filter cake, washing the filter cake to be neutral, drying, and grinding to obtain refined montmorillonite; acidifying refined montmorillonite with acetic acid, centrifuging to remove impurities, and preparing into montmorillonite slurry; mixing hexadecyl dimethyl benzyl ammonium chloride with absolute ethyl alcohol, stirring uniformly, adding into the montmorillonite slurry, stirring, drying, and calcining to obtain modified montmorillonite;
(2) mixing acrylic acid and chitin solution in a beaker, adding deionized water and potassium sulfate in the beaker, and stirring for reaction to obtain modified chitin solution;
(3) mixing the modified montmorillonite obtained in the step (1) with the modified chitin solution obtained in the step (2), stirring at a high speed, adding a cross-linking agent, stirring for reaction to obtain a synthetic resin blank, extruding the synthetic resin blank into a potassium hydroxide solution, aging, drying, grinding to obtain synthetic resin powder, heating and melting the synthetic resin powder, pouring the molten synthetic resin powder into a mold for solidification, cooling, and demolding to obtain synthetic resin;
(4) and (3) blending acrylic acid and acrylamide, adding into deionized water, stirring, adding potassium sulfate, heating, stirring, standing, defoaming, performing injection molding, curing to obtain synthetic fibers, bonding the synthetic resin obtained in the step (3) and the synthetic fibers together through a bonding agent, cutting, and sewing to obtain the medical non-woven composite material with high water absorption.
7. The medical non-woven composite material with high water absorption and the preparation method thereof according to claim 6, wherein the medical non-woven composite material with high water absorption and the preparation method thereof mainly comprise the following preparation steps:
(1) mixing the pretreated montmorillonite with 1mol/L sodium hydroxide solution according to the mass ratio of 1: 1.2, mixing, stirring at 300rpm for 30 minutes at 25 ℃, then carrying out suction filtration to obtain a pretreated montmorillonite filter cake, washing the pretreated montmorillonite filter cake with deionized water for 3 times, drying at 200 ℃ for 6 hours, grinding to obtain refined montmorillonite with the particle size of 200-300 nm, and mixing the refined montmorillonite with an acetic acid solution with the mass fraction of 0.2% in a mass ratio of 1: 1, mixing, stirring at 300rpm for 2 hours at 25 ℃, carrying out suction filtration to obtain an acidified montmorillonite filter cake, washing the acidified montmorillonite filter cake with deionized water for 3 times, and drying the obtained product for 24 hours at 25 ℃ to obtain a montmorillonite blank; mixing hexadecyl dimethyl benzyl ammonium chloride and absolute ethyl alcohol according to a mass ratio of 2: 1, mixing, stirring for 30 minutes at the rotating speed of 3000rpm to obtain an active agent solution, and mixing the montmorillonite blank and the active agent solution according to the mass ratio of 1: 0.2-1: 0.3, mixing, stirring at 300rpm for 2 hours at 25 ℃, drying at 105 ℃ for 12 hours, and then roasting at 350 ℃ for 2 hours to obtain modified montmorillonite;
(2) mixing acrylic acid and chitin solution according to the mass ratio of 1: 0.5-1: 2, mixing the chitin solution and the deionized water in a beaker, adding deionized water in an amount which is 1 time of the mass of the chitin solution and potassium sulfate in an amount which is 0.1 time of the mass of the chitin solution into the beaker, stirring the mixture at the rotating speed of 350rpm for 2 hours at the temperature of 25 ℃, and polymerizing the mixture for 5 hours at the temperature of 70 ℃ to obtain a modified chitin solution;
(3) dispersing modified montmorillonite in water, adjusting the pH to 4 by using acetic acid with the mass fraction of 5%, preparing montmorillonite slurry with the mass fraction of 3%, and mixing the montmorillonite slurry with the modified chitin solution according to the mass ratio of 1: 1-1: 1.2, mixing, stirring at 500rpm for 3 hours at 25 ℃, adding a cross-linking agent formaldehyde which is 0.1-0.2 time of the mass of the modified montmorillonite, stirring at 500rpm for 1 hour at 25 ℃ to obtain a synthetic resin blank, extruding the synthetic resin blank into a potassium hydroxide solution with the mass of 10 of the synthetic resin blank, aging for 24 hours, taking out, drying at 25 ℃ for 24 hours, grinding to obtain synthetic resin powder with the particle size of 300nm, heating to melt the synthetic resin powder, pouring the synthetic resin powder into a mold for solidification, cooling to 25 ℃, and demolding to obtain the synthetic resin;
(4) mixing acrylic acid and acrylamide according to a mass ratio of 1: 1, adding the mixture into deionized water with 5 times of the mass of acrylic acid, adding sodium hydroxide with 0.1 time of the mass of acrylic acid, stirring for 2 hours at the rotating speed of 350rpm, adding potassium sulfate with 0.2 time of the mass of acrylic acid, stirring for 3 hours at the rotating speed of 600rpm at 80 ℃, standing for 2 hours at 25 ℃, pouring the mixture into a mold, curing for 12 hours, demolding to obtain synthetic fibers, and mixing the synthetic fibers and synthetic resin by using a bonding agent with 0.2 time of the mass of the synthetic fibers according to the mass ratio of 1: 1, sticking, cutting and sewing to obtain the medical non-woven composite material with high water absorption.
8. The preparation method of the medical non-woven composite material with high water absorption according to claim 7, wherein the preparation method of the pre-treated montmorillonite in the step (1) is that the montmorillonite is roasted at the temperature of 260-300 ℃ for 2 hours, cooled to 25 ℃, put into a crusher to be crushed for 3 hours, and then sieved by a 200-mesh sieve, so that the pre-treated montmorillonite is obtained.
9. The method for preparing the medical non-woven composite material with high water absorption according to claim 7, wherein the chitin solution in the step (2) is prepared by mixing chitin and an acetic acid solution with a mass fraction of 3% in a mass ratio of 3: 100-4: 100, and the potassium hydroxide solution used in the step (3) is 0.3 to 0.45 mass percent of potassium hydroxide solution.
10. The preparation method of the medical non-woven composite material with high water absorption capacity according to claim 7, wherein the adhesive used in the step (4) is one or more of silicone, polyurethane, MS modified silane and borax.
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