Preparation method of chitosan-based superabsorbent material with antibacterial function and application thereof to sanitary napkins

Abstract

The present application relates to the field of high polymer water-absorbing material preparation, and particularly relates to a preparation method of a chitosan-based high water-absorbing material with antibacterial function, and the prepared high water-absorbing material comprises three layers, the upper and lower surfaces are plant fiber high air permeable layers, and the middle layer is a chitosan-based high water-absorbing microsphere with antibacterial function; the plant fiber high air permeable layer is obtained by electrospinning of kapok fiber, bamboo fiber, modified montmorillonite and polyvinyl alcohol; the high water-absorbing microsphere is a gel material obtained by condensation and cross-linking of chitosan and acrylic acid and then compounding and cross-linking of alginic acid; the prepared high water-absorbing microsphere has strong deformation resistance and a uniform and smooth surface. The high water-absorbing material has a water absorption capacity of 410 g / g or more, and an absorption capacity of simulated blood of 35 g / g or more, and has the characteristics of good air permeability, strong water absorption and good antibacterial activity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high molecular water-absorbing material preparation, and particularly relates to a preparation method of a chitosan-based high water-absorbing material with antibacterial function. BACKGROUND

[0002] High water-absorbing material is a new type of functional polymer material, and has a three-dimensional network structure with moderate cross-linking, and can absorb water, salt water and physiological fluid with a mass of 10-1000 times of itself. In the mid-1970s, Japan carried out research on high water-absorbing material prepared from cellulose as raw material, and obtained products in the form of sheet, powder and filament. In the 1980s, a non-ionic high water-absorbing material was synthesized by cross-linking treatment of various alkylene oxides with radiation, and the water-absorbing capacity of the material was 2000 times, thereby opening the door to non-ionic high water-absorbing materials. As one of the three raw materials (starch, cellulose and synthetic polymer) for synthesizing high water-absorbing material, cellulose has many advantages, such as abundant reserves, renewable, low price, easy to be chemically modified and less pollution to the environment. Therefore, it is of great significance to fully utilize the world's cellulose resources, especially the abundant cellulose in China, to research and develop various types of high water-absorbing material with low cost and high quality.

[0003] Chitosan is a natural polymer material forming hydrogel, and contains different types of polysaccharide sulfates. There are a large number of hydroxyl and amino active groups in the molecular structure of chitosan, and different chitosan derivatives can be obtained by various methods. The use of chitosan and synthetic polymer to synthesize hybrid hydrogel can combine the advantages of chitosan and synthetic polymer, so as to improve the performance of the hydrogel, and the mechanical strength of the synthetic polymer matrix can be retained, and the good biocompatibility of the natural polymer material can also be retained. However, the pure chitosan film dressing has the disadvantages of poor mechanical property, high brittleness and poor water resistance. After absorbing liquid, the air permeability of the chitosan film dressing will be poor.

[0004] A chitosan composite dressing and a preparation method thereof are disclosed in Chinese Patent No. CN106963973B. The composite dressing includes a chitosan dressing pad layer, a medical water-absorbing pad layer, a waterproof layer and a medical adhesive tape pasting layer. The waterproof layer is covered on the medical adhesive tape pasting layer, the medical water-absorbing pad layer is located between the chitosan dressing pad layer and the waterproof layer, and the chitosan dressing pad layer is provided with air holes. The chitosan dressing pad layer, the medical water-absorbing pad layer and the waterproof layer have the same shape and area, and the chitosan dressing pad layer is covered with a layer of anti-adhesive paper which has the same area as the medical adhesive tape pasting layer. The air holes on the chitosan dressing pad layer and the medical water-absorbing pad layer can ensure high permeability of water and air, and avoid the whitening and swelling of the wound. Although the composite dressing is provided with air holes, when the dressing absorbs a large amount of water, the water will block the air holes, thereby seriously affecting the air permeability of the dressing.

[0005] The Chinese patent with publication number CN118531519B discloses a kind of high water-absorbing fiber for paper diaper core layer material and its production process, which discloses a kind of high water-absorbing fiber for paper diaper core layer material, including the following weight parts raw materials: sodium acrylate solution 70~90 parts, polyacrylamide microspheres 20~45 parts, modified hydroxyethyl methacrylate 2~10 parts, polyvinyl alcohol solution 10~30 parts, initiator 0.5~5 parts, crosslinking agent 1~5 parts;The polyacrylamide microspheres are polyacrylamide microspheres prepared by inverse suspension polymerization method;The modified hydroxyethyl methacrylate is hydroxyethyl methacrylate grafted with oxidized multi-walled carbon nanotube modified hydroxyethyl methacrylate, the water-absorbing fiber of the present application is improved by adding polyacrylamide microspheres and modified hydroxyethyl methacrylate water-absorbing fiber, salt resistance and fracture toughness.The patent solves the water absorption problem and anti-fracture property of cellulose, but also does not solve the problem of air permeability and antibacterial property in high water absorption state.

[0006] Therefore, it is still a difficult problem to design a high water-absorbing material with good air permeability and certain antibacterial function. SUMMARY

[0007] In order to solve the above problems, the purpose of the present application is to provide a preparation method of a high water-absorbing material with antibacterial function chitosan-based, to solve one or more technical problems existing in the prior art, at least to provide a beneficial choice or to create conditions.

[0008] The high water-absorbing material provided by the present application comprises three layers, the upper and lower surfaces are plant fiber high air permeability layer, and the middle is high water-absorbing microspheres with antibacterial function chitosan-based. The plant fiber high air permeability layer is obtained by electrospinning of kapok fiber, bamboo fiber, modified montmorillonite and polyvinyl alcohol, and the high water-absorbing microspheres are gel materials obtained by condensation crosslinking of chitosan and acrylic acid and then compounding crosslinking of alginic acid;

[0009] The preparation method of the plant fiber high air permeability layer is as follows:

[0010] S1, the kapok fiber is cut by high-speed shearing machine, the kapok fiber is surface treated with 2% NaOH aqueous solution for 5~10 minutes, then washed with deionized water to neutral, and then put into a beater to be beaten, then add vinyl trimethoxysilane and stir uniformly to obtain kapok pulp for standby;

[0011] The addition amount of the vinyl trimethoxysilane is 0.1~0.3 parts per 100 parts of kapok pulp; The stirring reaction conditions are as follows: stirring speed 800~1000 rpm, time 2~3 hours;

[0012] S2, the bamboo fiber is cut by a high-speed shearing machine, and is put into a beater to be beaten after being treated, then the kapok pulp is added, and the plant fiber pulp is obtained after being stirred uniformly; the plant fiber pulp solution is put into a high-pressure homogenizer to be homogenized, and a plant cellulose solution is obtained;

[0013] The mass ratio of the kapok fiber and the bamboo fiber is 1:8-10.

[0014] S3, the polyvinyl alcohol is stirred and heated at 80℃ for 80-120 minutes until completely dissolved, the modified montmorillonite is added, and stirred for 30-50 minutes, so that the modified montmorillonite is uniformly dispersed in the polyvinyl alcohol solution, and a polymer solution is obtained;

[0015] The mass ratio of the modified montmorillonite and the polyvinyl alcohol is 1:3-5; and the mass fraction of the polyvinyl alcohol is 12-18%.

[0016] S4, the polymer solution and the plant cellulose solution are mixed according to a mass ratio of 1:(2-3), and then electrospinning is performed to obtain a plant fiber high-breath layer.

[0017] After the kapok fiber is treated with 2% NaOH aqueous solution and vinyl trimethoxysilane, the kapok fiber shows stronger hydrophobicity. The NaOH treatment helps to provide more opportunities for the silane molecules to combine effectively, and the coating of the silane makes the fiber surface more hydrophobic, reduces the water contact angle, and thus enhances the hydrophobicity. The plant fiber high-breath layer made of the hydrophobic kapok fiber, the polymer solution and the bamboo fiber has higher porosity, and has stronger breathability due to the design of hydrophilicity and hydrophobicity.

[0018] The preparation method of the modified montmorillonite is as follows:

[0019] The montmorillonite with a diameter of about 1 μm is selected, the montmorillonite is added into deionized water, dilute hydrochloric acid is added and stirred uniformly, so that the montmorillonite is fully dispersed in the dilute hydrochloric acid solution, the temperature is raised to 60℃, octadecyl trimethyl ammonium chloride is added, and stirred fully, and the reaction is carried out for 1-2 hours to obtain a montmorillonite suspension, then centrifugal separation is carried out at a speed of 3500 rpm, the hydrochloric acid and the octadecyl trimethyl ammonium chloride are removed by washing with deionized water for 2-3 times, centrifugal separation is carried out, and the bottom solid mixture is taken out. At this time, the interlayer spacing of the montmorillonite is expanded by the action of the quaternary ammonium salt.

[0020] The bottom solid mixture is added into deionized water, the pH is adjusted to 6.3-6.5 by using sodium carbonate or citric acid, and glycine is added, and the reaction is carried out for 1-2 hours, so that the surface of the montmorillonite is loaded with negative charges. After completion, the modified montmorillonite is obtained by filtration, drying and grinding. The mass ratio of the octadecyl trimethyl ammonium chloride and the montmorillonite is 1:6-8; and the mass ratio of the glycine and the montmorillonite is 1:10.

[0021] Glycine is fixed in the layer of montmorillonite by ionic bond and hydrogen bond, which further leads to the expansion of the interlayer spacing, and the hydrophilicity of the modified montmorillonite after treatment is reduced, the hydrophobicity is enhanced, and the interlayer spacing is increased.

[0022] The electrospinning parameters are as follows: voltage is 30 kV, receiving distance is 10 cm, flow rate is 1 mL / h, and ambient temperature and humidity are 25 DEG C and 40% to 60%, respectively.

[0023] The upper and lower layers of the three-layer structure of the high water-absorbing material are made of modified montmorillonite, and the plant fiber high-breath layer is made of plant fiber and polyvinyl alcohol solution, which is mainly used for water and air permeation; the middle layer is a high water-absorbing layer, which is mainly used for absorbing and enriching liquid.

[0024] Because kapok fiber is a renewable natural cellulose, the fiber cross section is oval or circular, the structure is hollow, and the hollow rate is as high as 80% to 90%, the cell wall is thin, about 0.5 to 2.0 microns, the fiber wall section presents micropores, and the contact angle with water after modification is as high as 160 DEG, which has very significant hydrophobic and oleophilic properties. Therefore, kapok fiber has certain resistance to water, but because the hollow rate of kapok fiber is too high, the too loose structure is not conducive to water control. How to process the fiber and utilize the special hollow structure and oleophilic and hydrophobic properties of kapok fiber to make it have significant air permeability in the overall high water-absorbing environment is the key problem to be solved.

[0025] First, the kapok fiber and bamboo fiber can be obtained by electrospinning technology. The kapok fiber and bamboo fiber have a large number of hollow structures, so that the polyvinyl alcohol solution containing lipophilic montmorillonite and its compound can make the lipophilic montmorillonite fill the pores between the electrospun fibers, ensure that the specific surface area and porosity of the fibers are relatively good, and improve the mechanical properties and adsorption properties of the fibers. This structure not only improves the adsorption of the fibers themselves, but also improves the liquid phase and air flux after the fibers are formed into a film. The fiber structure has isotropy in the two-dimensional direction, that is, the fibers are randomly oriented in the plane, and the internal space has rich three-dimensional space channels, which provides a flow path for the airflow. The kapok fiber has very significant hydrophobic and lipophilic properties, and the bamboo fiber contains a large number of hydroxyl groups, which can form hydrogen bonds with water molecules, so the water absorption is particularly strong, and has the characteristics of fast moisture absorption and fast drying. Polyvinyl alcohol also contains a large number of hydroxyl groups, which can combine with water molecules to form a hydrophilic environment. The organic combination of the three makes the high air permeable layer contain both hydrophobic groups and hydrophilic groups. Such a structure makes the high air permeable layer part of the hydrophilic group effectively absorb water and introduce it into the high water absorption layer, and the other part of the hydrophobic group surface is not occupied by water molecules because of its water resistance, and interacts with the lipophilic modified montmorillonite to form a three-dimensional space channel with rich twists inside, which provides a flow path for the airflow, realizes high air permeability, and even after high water absorption, the air permeable pores of the material still have effective air permeability because of the hydrophobic performance.

[0026] It is generally believed that the non-steady state is entered when the piezoresistance suddenly increases due to the blockage of the pore structure, at which time, when the pore between the fibers is small, the air molecules in the tube pass around a fiber and can also hit another fiber, thereby causing the air permeability to decrease significantly and the water absorption performance to decrease due to the increase in piezoresistance. Therefore, how to achieve a high coefficient and low air resistance is always a key scientific problem that needs to be solved in the regulation of fiber structure. If the water absorption layer is a simple fiber layer, although the diameter of the electrospun fiber is mostly in the nanometer order, the high specific surface area brought by this structural feature can make the material exhibit very high air permeability at a low grammage, but the nanofiber often exhibits the characteristic of dense accumulation, making it difficult to improve the porosity of the electrospun fiber material, and when the fiber is kapok fiber and the oil-wet montmorillonite is introduced into the fiber, this problem can be well solved. This is mainly because the kapok fiber structure has a larger fiber diameter, with a hollow rate of more than 90%, which significantly improves the porosity, but if only a single kapok fiber structure is used, it is difficult to make it have good water permeability, and the water absorption is very poor. At this time, by compounding the polymer solution containing oil-wet montmorillonite and bamboo fiber, the problem of water absorption and water permeability can be solved, at which time the polymer solution can make the pore size smaller, and the microspherical structure of the oil-wet montmorillonite makes the inside have a large number of rich three-dimensional space channels, significantly improving the air permeability. Therefore, such a fiber structure not only has a smaller fiber diameter, but also can rely on the small pore size of the microspheres to achieve high porosity. And the hollow structure between each other will be tightly packed by the polymer with microspherical channels, forming countless small micropores. Therefore, without reducing the porosity, there are a large number of rich three-dimensional space channels inside the fiber structure.

[0027] Further, the high water absorption microspheres are gel materials obtained by condensation and crosslinking of chitosan and acrylic acid under the action of a catalyst, and then compounding crosslinked alginic acid, including the following raw materials: acrylic acid; water, chitosan, chitooligosaccharide, 2,2-azobis (2-methylpropyl amidine) dihydrochloride; 1-hydroxy cyclohexyl phenyl ketone; alginic acid; glutaraldehyde and lubricant. The specific preparation method is as follows:

[0028] S01, the following raw materials are weighed by weight parts: 15-20 parts of acrylic acid, 60-75 parts of water, 2-6 parts of chitosan, 1-3 parts of chitooligosaccharide, 2,2-azobis (2-methylpropyl amidine) dihydrochloride; 1-hydroxy cyclohexyl phenyl ketone, to obtain a mixed solution;

[0029] S02, the mixed solution is placed at 40-80℃ for polymerization and crosslinking reaction, and then cooled to obtain a polymerization liquid material system;

[0030] The chitosan / chitooligosaccharide-polyacrylic acid grafted copolymer is formed by chemical grafting and physical crosslinking, and has a three-dimensional network structure.

[0031] The 2,2-azobis(2-methylpropylamidine) dihydrochloride is 2-5 parts per million of the total material mass; the 1-hydroxycyclohexyl phenyl ketone is 2-5 parts per million of the total material mass; the chitosan oligosaccharide is chitosan oligosaccharide with a number average molecular weight of 1200-3400;

[0032] S03, add alginic acid and glutaraldehyde to the polymerization liquid material system, uniformly stir for 3-5 minutes, and then stand for 5-10 hours to form a viscous material system; heat the material to 75-95℃ and keep for 8-12 hours to form a hard and brittle hydrogel material.

[0033] S04, add a lubricant to the hard and brittle hydrogel material, high-speed stir for 30-50 minutes to break it, heat to 95-110℃ and dry to a hard and dry particle, and finally grind to 60-100 mesh particles to obtain the high water absorption microspheres.

[0034] The alginic acid is 1.5-2 times the mass of chitosan, and the glutaraldehyde is 65-85% of the mass of chitosan; the lubricant is a mixture of ammonia, polyethylene glycol, glycerol and aziridine, and the mass ratio of ammonia, polyethylene glycol, glycerol, aziridine and the gel material is 150-300:5-15:0.2-0.6:0.01-0.03:100; the mass fraction of ammonia is 10-15%.

[0035] The high water absorption microspheres are prepared by using acrylic acid, chitosan and oligosaccharide as raw materials, under the action of a catalyst, through condensation polymerization and crosslinking, forming a chitosan / chitosan oligosaccharide-polyacrylic acid grafted copolymer, and then through a crosslinking agent glutaraldehyde, the alginic acid and the copolymer are further crosslinked to obtain high water absorption gel particles, and finally through the action of a lubricant to obtain high water absorption microspheres; it is a kind of high molecular electrolyte with a certain crosslinking structure, which repels each other in water to promote the swelling of the polymer, and at the same time, due to the difference in ion concentration inside and outside, osmotic pressure is generated, so that a large amount of water enters the interior of the hydrogel; and the crosslinking structure of the polymer will limit the swelling, so that the polymer after absorbing water has a certain mechanical strength. The balance of the above two factors determines the size of the water absorption capacity. Chitosan and oligosaccharide cellulose are high molecular polysaccharides containing multiple hydroxyl groups. Due to the hydrophilicity of hydroxyl groups, natural cellulose itself has a certain water absorption and moisture absorption capacity. However, the highly crystalline structure limits the water absorption capacity of most hydroxyl groups in the hydrogen bonding state. Therefore, when preparing cellulose-based high water absorption materials, the crystalline structure should be destroyed as much as possible, and then high hydrophilic groups such as carboxyl and hydroxyl groups are grafted on the cellulose macromolecule through graft copolymerization and crosslinking chemical reaction method, and the gel strength after water absorption is ensured by moderate crosslinking. Chitosan-based high water absorption material is synthesized to form a macromolecule with crosslinked network structure.

[0036] Finally, the three-layer structure of high water-absorbing material is prepared, the upper and lower surface layers are 0.5-1.0 mm plant fiber high permeable layers, and the middle layer is 1-2 mm high water-absorbing microspheres with antibacterial function of chitosan base.

[0037] The surface layer is prepared by electrospinning technology by using hydrophilic material prepared from hydrophilic fibers and hydrophobic structure prepared from hydrophobic fibers, the surface is soft and permeable, and the water permeability is good, and the middle layer can improve the electrostatic repulsion and internal and external osmotic pressure by introducing hydroxyl and carboxyl groups on the polymer chain, crosslinking polysaccharide and ionic groups, and adding inorganic particles, so as to endow the high water-absorbing material with better liquid absorption capacity. The porous structure gel is loaded into the permeable layer by taking the fabric as the base, and the high water-absorbing material with good forming capacity and strong water absorption capacity is obtained, and the absorption capacity of the high water-absorbing material to salt water or viscous liquid is improved by increasing the anion electrostatic repulsion and internal and external osmotic pressure in the system.

[0038] Finally, the high water-absorbing material with antibacterial function of chitosan base prepared can be used as medical dressing or used on sanitary napkins.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] 1) The present application provides a high water-absorbing gel micro-particle, which is prepared from acrylic acid, chitosan and oligosaccharide as raw materials, under the action of a catalyst, through polycondensation and crosslinking, chemical grafting and physical crosslinking to form a chitosan / chitosan oligosaccharide-polyacrylic acid grafted copolymer, and then through a crosslinking agent glutaraldehyde, the alginate is further crosslinked with the copolymer to obtain the high water-absorbing gel micro-particle, and finally through the action of a lubricant, the high water-absorbing micro-sphere material is obtained; the prepared high water-absorbing micro-sphere has strong deformation resistance, a uniform and smooth surface, and the swelling behavior, degradation and mechanical properties of the high water-absorbing micro-sphere can be adjusted by adjusting the raw material ratio.

[0041] 2) The present application also provides a plant fiber high permeable layer, which comprises hydrophobic kapok fibers, hydrophilic bamboo fibers and a polymer containing oleophilic montmorillonite, and has high permeability; the three are organically combined, so that the prepared plant fiber high permeable layer contains both hydrophobic groups and hydrophilic groups, and the structure is arranged in such a way that the permeability of the surface layer is still effective after the material absorbs water due to the hydrophobic performance. Therefore, such a fiber structure not only has a small diameter of the fiber structure, but also can realize high porosity by relying on the small pore diameter of the micro-sphere. And the hollow structure between each other will be tightly packed by the polymer with micro-sphere channels, forming countless tiny micropores. Therefore, without reducing the porosity, the internal structure of the fiber structure has a large number of rich three-dimensional space channels due to the micro-sphere structure of the oleophilic montmorillonite, which significantly improves the permeability.

[0042] 3) The high water-absorbing material with three-layer structure provided by the application uses biological materials which are non-toxic to human body, have good compatibility and safety, and have a water-absorbing capacity of 400 g / g or more and a simulated blood-absorbing capacity of 35 g / g or more. The material has the characteristics of air permeability, antibiosis, high water-absorbing capacity, uniform distribution and good air permeability, and is made of natural and non-toxic raw materials and has good environmental protection, so it can be used for medical dressings or sanitary napkins and has a certain application and promotion prospect. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 Preparation flow chart of high water-absorbing microspheres DETAILED DESCRIPTION

[0044] The application will be further described in conjunction with specific embodiments. It should be understood that these embodiments are only used for illustrating the application and are not used for limiting the scope of the application. Furthermore, it should be understood that after reading the content of the application, those skilled in the art can make various modifications or changes to the application, and these equivalent forms also fall within the scope defined by the appended claims.

[0045] Example 1

[0046] A preparation method of a chitosan-based high water-absorbing material with antibacterial function, first, a high air permeable layer of plant fiber is prepared, specifically:

[0047] 50 parts of kapok fiber are cut into pieces by a high-speed shearing machine, the kapok fiber is surface treated by 2% NaOH aqueous solution for 5 minutes, then washed to neutral by deionized water to obtain kapok fiber pieces, which are put into a beater for beating treatment, then 0.05 parts of vinyl trimethoxysilane is added, and stirring is carried out at a stirring speed of 800 rpm for 2 hours, and then stirring is uniformly carried out to obtain kapok pulp for standby use; 400 parts of bamboo fiber are cut into pieces by a high-speed shearing machine, and then put into a beater for beating treatment, then the kapok pulp is added, and stirring is uniformly carried out to obtain plant fiber pulp; the plant fiber pulp solution is put into a high-pressure homogenizer for homogenization treatment to obtain a plant cellulose solution;

[0048] Further, the preparation method of the modified montmorillonite is as follows: montmorillonite with a diameter of about 1 μm is selected, 80 parts of the montmorillonite is added into 80 parts of deionized water, 3 parts of dilute hydrochloric acid is added and stirred uniformly, so that the montmorillonite is fully dispersed in the dilute hydrochloric acid solution, the temperature is raised to 60℃, 10 parts of octadecyl trimethyl ammonium chloride is added, and stirring is carried out fully, and then the reaction is carried out for 1-2 hours to obtain a suspension of the montmorillonite, then centrifugal separation is carried out at a speed of 3500 rpm, and the suspension is washed by deionized water for 2-3 times to remove the hydrochloric acid and excess octadecyl trimethyl ammonium chloride, then centrifugal separation is carried out, and the solid mixture at the bottom is taken out, at this time, the interlayer spacing of the montmorillonite is expanded by the action of the quaternary ammonium salt;

[0049] The bottom solid mixture is added to 50 parts of deionized water, and the pH is adjusted to 6.3 with sodium carbonate or citric acid, and 8 parts of glycine is added, and the reaction is carried out for 2 hours to make the surface of the montmorillonite loaded with negative charges, and after completion, the modified montmorillonite is obtained after filtration, drying and grinding; 120 parts of polyvinyl alcohol is stirred and heated at 80℃ for 120min until completely dissolved, 40 parts of modified montmorillonite is added, and stirred for 40min to make the modified montmorillonite uniformly dispersed in the polyvinyl alcohol solution to obtain a polymer solution;

[0050] Finally, 100 parts of the polymer solution and 300 parts of the plant cellulose solution are mixed, and then electrospinning is carried out to obtain a plant fiber high-breath layer under the conditions of a voltage of 30kV, a receiving distance of 10cm, a flow rate of 1mL / h, and an ambient temperature and humidity of 25℃ and 40% respectively.

[0051] Further, the preparation of the high water-absorbing microspheres includes the following raw materials: acrylic acid, water, chitosan, chitooligosaccharide, 2,2-azobis(2-methylpropylamidine) dihydrochloride, 1-hydroxy cyclohexyl phenyl ketone, alginic acid, glutaraldehyde and a lubricant; and the specific preparation method is as follows:

[0052] The following are weighed by weight parts: 15 parts of acrylic acid, 60 parts of water, 6 parts of chitosan, 1 part of chitooligosaccharide, 0.02 parts of 2,2-azobis(2-methylpropylamidine) dihydrochloride, and 0.02 parts of 1-hydroxy cyclohexyl phenyl ketone to obtain a mixed solution; the mixed solution is placed at 60℃ for 4 hours of polymerization and crosslinking reaction, and then cooled to obtain a polymerization liquid material system; 12 parts of alginic acid and 5.1 parts of glutaraldehyde are added to the polymerization liquid material system, uniformly stirred for 5 minutes, and then left to stand for 8 hours to form a viscous material system; the material is heated to 75℃ and kept for 10 hours to form a hard and brittle hydrogel material;

[0053] The following are mixed and stirred to obtain a lubricant: 150 parts of 15% ammonia water, 10 parts of polyethylene glycol, 0.3 parts of glycerol and 0.02 parts of aziridine; 100 parts of the hard and brittle hydrogel material is taken, the lubricant is added, and high-speed stirring is carried out for 50 minutes to break the material; the material is heated to 100℃ and dried to a hard and brittle particle; and finally, the particle is ground to 60-100 mesh to obtain the high water-absorbing microspheres.

[0054] Finally, the preparation of the high water-absorbing material with antibacterial function of the chitosan base is a three-layer structure of the high water-absorbing material, the upper and lower layers are 0.5mm plant fiber high-breath layers, and the middle layer is 2mm high water-absorbing microspheres with antibacterial function of the chitosan base.

[0055] Example 2

[0056] A method for preparing a high water-absorbing material with antibacterial function of a chitosan base, which first prepares a plant fiber high-breath layer, specifically as follows:

[0057] 50 parts kapok fibers are cut by a high-speed shearing machine, the kapok fibers are treated by 2% NaOH aqueous solution for 5 minutes, then washed by deionized water until neutral, and then put into a beater to be beaten, then 0.15 parts of vinyl trimethoxysilane is added, and stirred at a stirring speed of 1000 rpm for 2 hours to obtain a kapok pulp for standby; 500 parts of bamboo fibers are cut by a high-speed shearing machine, and then put into a beater to be beaten, then the kapok pulp is added, and stirred to obtain a plant fiber pulp; the plant fiber pulp is put into a high-pressure homogenizer to be homogenized to obtain a plant cellulose solution;

[0058] Further, the preparation method of the modified montmorillonite is specifically as follows:

[0059] Select montmorillonite with a diameter of about 1 μm, add 80 parts of montmorillonite to 80 parts of deionized water, add 3 parts of dilute hydrochloric acid and stir uniformly, so that the montmorillonite is fully dispersed in the dilute hydrochloric acid solution, heat to 60℃, add 12 parts of octadecyl trimethyl ammonium chloride, stir well, and react for 2 hours to obtain a montmorillonite suspension, then centrifugal separation at a speed of 3500 rpm, wash with deionized water for 3 times to remove hydrochloric acid and excess octadecyl trimethyl ammonium chloride, centrifugal separation, and take out the bottom solid mixture, at this time the montmorillonite has expanded interlayer spacing by the action of quaternary ammonium salt;

[0060] Add the bottom solid mixture to 50 parts of deionized water, adjust the pH to 6.4 with sodium carbonate or citric acid, add 8 parts of glycine, and react for 2 hours to load negative charges on the surface of the montmorillonite, then filter, dry and grind to obtain the modified montmorillonite; add 150 parts of polyvinyl alcohol to 1000 parts of deionized water and stir at 80℃ for 120 min until completely dissolved, then add 30 parts of the modified montmorillonite and stir for 50 min to uniformly disperse the modified montmorillonite in the polyvinyl alcohol solution to obtain a polymer solution;

[0061] Finally, under the conditions of voltage of 30 kV, receiving distance of 10 cm, flow rate of 1 mL / h, and environmental temperature and humidity of 25℃ and 40% respectively, 100 parts of the polymer solution and 200 parts of the plant cellulose solution are mixed, and then electrospun to obtain a plant fiber high-breath layer.

[0062] Further, the preparation of high water absorption microspheres includes the following raw materials: acrylic acid, water, chitosan, chitooligosaccharide, 2,2-azobis (2-methylpropyl amidine) dihydrochloride, 1-hydroxy cyclohexyl phenyl ketone, alginic acid, glutaraldehyde and lubricant; and the specific preparation method is as follows:

[0063] Take 20 parts of acrylic acid, 75 parts of water, 2 parts of chitosan, 3 parts of chitooligosaccharide, add 0.03 parts of 2,2-azobis (2-methylpropyl amidine) dihydrochloride; 0.02 parts of 1-hydroxycyclohexyl phenyl ketone, get the mixed solution; Put in 80℃ for polymerization and crosslinking reaction for 4 hours, cool down, get the polymerization liquid material system; Add 4 parts of alginic acid and 1.3 parts of glutaraldehyde to the polymerization liquid material system, stir evenly for 3 minutes, stand for 5 hours, form a viscous material system; Heat the material to 80℃ and keep for 12 hours, form a hard brittle hydrogel material;

[0064] Mix 300 parts of 10% ammonia water, 15 parts of polyethylene glycol, 0.2 parts of glycerol and 0.03 parts of aziridine to get a lubricant; Take 100 parts of the hard brittle hydrogel material, add the lubricant, stir at high speed for 50 minutes, make it broken, heat to 110℃ and dry to dry hard particles, finally grind to 60-100 mesh particles, get the high water absorption microspheres.

[0065] Finally, the preparation of high water absorption material with antibacterial function of chitosan base is a three-layer structure of high water absorption material, the upper and lower layers are 0.5mm plant fiber high permeable layer, the middle layer is 1.2mm high water absorption microspheres with antibacterial function of chitosan base.

[0066] Example 3

[0067] A method for preparing a high water absorption material with antibacterial function of chitosan base, first prepare a plant fiber high permeable layer, specifically:

[0068] Cut 50 parts of kapok fiber with a high speed shearing machine, treat the surface of the kapok fiber with 2% NaOH aqueous solution for 5 minutes, then wash it to neutral with deionized water to get kapok fiber fragments, put it into a beater to be beaten, then add 0.1 parts of vinyl trimethoxysilane, stir at a stirring speed of 9000rpm for 3 hours; Get kapok pulp for standby; Cut 450 parts of bamboo fiber with a high speed shearing machine, put it into a beater to be beaten, then add the kapok pulp, stir evenly to get plant fiber pulp; Put the plant fiber pulp into a high pressure homogenizer for homogenization treatment, get plant cellulose solution;

[0069] Further, the preparation method of modified montmorillonite is as follows:

[0070] Select the diameter of about 1 μm montmorillonite, 80 parts of montmorillonite is added to 80 parts of deionized water, add 3 parts of dilute hydrochloric acid stirring uniform, make montmorillonite fully dispersed in dilute hydrochloric acid solution, heating to 60 ℃, add 10 parts of octadecyl trimethyl ammonium chloride, fully stir, reaction 2 hours, get the suspension of montmorillonite, again with 3500 rpm centrifugal separation, with deionized water wash 3 times to remove hydrochloric acid and excess octadecyl trimethyl ammonium chloride, centrifugal separation, take out the bottom of the solid mixture, at this time montmorillonite through the action of quaternary ammonium salt layer spacing expansion;

[0071] The bottom of the solid mixture is added to 50 parts of deionized water, and then adjusted to pH 6.5 with sodium carbonate or citric acid, 8 parts of glycine is added, and the reaction is carried out for 2 hours, so that the surface of the montmorillonite is loaded with negative charge, after completion, filtering, drying, grinding to obtain modified montmorillonite; 180 parts of polyvinyl alcohol is stirred and heated at 80℃ for 120 min until completely dissolved, 45 parts of modified montmorillonite is added, and stirred for 50 min to make the modified montmorillonite uniformly dispersed in the polyvinyl alcohol solution to obtain a polymer solution;

[0072] Finally, under the conditions of voltage 30 kV, receiving distance 10 cm, flow rate 1 mL / h, environmental temperature and humidity 25℃ and 40% respectively, 100 parts of polymer solution and 300 parts of plant cellulose solution are mixed, and then electrospinning is carried out to obtain a plant fiber high-breath layer.

[0073] Further, the high water absorption microspheres are prepared by using the following raw materials: acrylic acid, water, chitosan, chitooligosaccharide, 2,2-azobis (2-methylpropyl amidine) dihydrochloride, 1-hydroxy cyclohexyl phenyl ketone, alginic acid, glutaraldehyde and lubricant.

[0074] The following are weighed by weight parts: 18 parts of acrylic acid, 70 parts of water, 4 parts of chitosan, 2 parts of chitooligosaccharide, 0.29 parts of 2,2-azobis (2-methylpropyl amidine) dihydrochloride, and 0.3 parts of 1-hydroxy cyclohexyl phenyl ketone to obtain a mixed solution; the mixed solution is placed at 40-80℃ for polymerization and crosslinking reaction for 4 hours, and then cooled to obtain a polymerization liquid material system; 6 parts of alginic acid and 2.8 parts of glutaraldehyde are added to the polymerization liquid material system, stirred uniformly for 4 minutes, and then left to stand for 8 hours to form a viscous material system; the material is heated to 95℃ and kept for 10 hours to form a hard and brittle hydrogel material.

[0075] The following are weighed by weight parts: 18 parts of acrylic acid, 70 parts of water, 4 parts of chitosan, 2 parts of chitooligosaccharide, 0.29 parts of 2,2-azobis (2-methylpropyl amidine) dihydrochloride, and 0.3 parts of 1-hydroxy cyclohexyl phenyl ketone to obtain a mixed solution; the mixed solution is placed at 40-80℃ for polymerization and crosslinking reaction for 4 hours, and then cooled to obtain a polymerization liquid material system; 6 parts of alginic acid and 2.8 parts of glutaraldehyde are added to the polymerization liquid material system, stirred uniformly for 4 minutes, and then left to stand for 8 hours to form a viscous material system; the material is heated to 95℃ and kept for 10 hours to form a hard and brittle hydrogel material.

[0076] Finally, the high water-absorbing material with antibacterial function chitosan base is a three-layer structure high water-absorbing material, the upper and lower layers are 1.0 mm plant fiber high permeability layers, and the middle layer is 1.5 mm high water-absorbing microspheres with antibacterial function chitosan base.

[0077] Comparative Example 1; when preparing the plant fiber high permeability layer, no kapok fiber and no modified montmorillonite are added, only an equal amount of polyvinyl alcohol and bamboo fiber is used to replace, and the others are the same as Example 1;

[0078] Comparative Example 2; when preparing the plant fiber high permeability layer, cotton pulp is used to replace kapok pulp, and montmorillonite is used to replace modified montmorillonite, and the others are the same as Example 1;

[0079] Comparative Example 3; when preparing the high water-absorbing microspheres, no chitosan and oligosaccharide is added, and the polycondensed acrylic acid is directly crosslinked with glutaraldehyde and alginic acid, and the others are the same as Example 1;

[0080] Comparative Example 4; when preparing the plant fiber high permeability layer, cotton pulp is used to replace kapok pulp, and montmorillonite is used to replace modified montmorillonite, and when preparing the high water-absorbing microspheres, no chitosan and oligosaccharide is added, and the polycondensed acrylic acid is directly crosslinked with glutaraldehyde and alginic acid, and the others are the same as Example 1;

[0081] Comparative Example 5, a certain brand of sanitary napkin purchased on the market.

[0082] Test data and result analysis

[0083] 1. Permeability:

[0084] According to the provisions of GB / T 5453-1997, the permeability of the prepared high water-absorbing material with antibacterial function chitosan base was tested, the samples to be tested of Examples 1-3 and Comparative Examples 1-5 were pre-humidified in a standard atmospheric environment with a temperature of 20°C and a relative humidity of 65%, the test area was set to 20cm 2 , the pressure drop was set to 100Pa, and different positions were randomly selected for testing, each group of samples was tested 10 times and the values were recorded, and the average permeability of the sample was calculated, as shown in Table 1;

[0085] The samples to be tested of Examples 1-3 and Comparative Examples 1-5 were placed in water, uniformly absorbed 100g of water, then the sample was taken out, the excess water on the surface was absorbed with a paper towel, different positions were randomly selected for testing, each group of samples was tested 10 times and the values were recorded, and the average permeability of the sample after water absorption was calculated, as shown in Table 1.

[0086] Table 1 Permeability test of high water-absorbing material

[0087]

[0088] From Table 1, it can be seen that Examples 1-3 have superior air permeability before and after water absorption. This is because the plant fibers of the surface layer of Examples 1-3 are made of both hydrophilic and hydrophobic fibers. Before water absorption, both types of fibers have good air permeability. However, after water absorption, the two types of fibers exhibit different hydrophilic and hydrophobic properties. The presence of hydrophobic fibers prevents the air permeation pores from expanding due to water absorption, which would otherwise cause the pores to become smaller or the resistance to increase, or even be completely blocked, resulting in a significant decrease in air permeability. The bamboo fibers and polyvinyl alcohol of Comparative Example 1 are both hydrophilic materials, and their air permeability decreases significantly after water absorption. In Comparative Examples 2 and 4, the good hydrophilic cotton pulp is used instead of the hydrophobic kapok pulp, resulting in a decrease in porosity. In the case of increased water content, the air permeability will inevitably decrease sharply. In Comparative Examples 2 and 4, the hydrophilic montmorillonite is further filled, and after water absorption, the original small interlayer spacing of the montmorillonite is occupied by water molecules, further weakening the air permeability. In Examples 1-3, in addition to the air permeation pores preserved by the hydrophobic kapok fibers due to their hydrophobicity, the more important factor is the further superposition of the oil-wet and expanded interlayer spacing montmorillonite, which has a rich three-dimensional space channel inside, providing a flow path for air flow. The kapok fibers have a very significant hydrophobic and oleophilic property, and the bamboo fibers contain a large number of hydroxyl groups that can form hydrogen bonds with water molecules, resulting in strong water absorption and fast drying. The polyvinyl alcohol also contains a large number of hydroxyl groups that can combine with water molecules to form a hydrophilic environment. The combination of the three makes the plant fiber high air permeability layer contain both hydrophobic and hydrophilic groups. This structure allows part of the hydrophilic groups to effectively absorb water and transfer it to the high water absorption layer, while the other part of the hydrophobic groups is not occupied by water molecules due to their water resistance, and interacts with the oil-wet modified montmorillonite to form a rich three-dimensional space channel inside, providing a flow path for air flow and achieving high air permeability. Even after high water absorption, the air permeation pores of the material remain effective due to the hydrophobic property of the surface layer. The air permeability is also related to the high water absorption microspheres in the middle. The mechanical strength of the high water absorption microspheres after physical and chemical crosslinking is significantly improved, and they are not easily broken after water absorption. The gap between the microspheres is larger than that after breaking, so it also helps to improve the air permeability.

[0089] 2. Re-wetting amount test: The high water absorption material after absorbing deionized water for 1 hour was placed at 25°C and 70% (relative humidity), and a filter paper was placed on its surface,

[0090] Main test instruments and materials: standard briquettes, medium-speed qualitative analysis filter paper (150 mm x 150 mm) Test solution: standard synthetic test solution for permeability test; Test method: refer to standard GB / T3013-2013 Appendix B to test the backflow of the test sample, cut the sample; the size is 100 mm x 100 mm, test 5 times for each sample, take the average value, see Table 2. The calculation formula of backflow is: G = G2 - G1

[0091] In the formula: G2 - the mass of the filter paper after backflow, g; G1 - the initial mass of the filter paper, g.

[0092] The backflow refers to the mass of liquid returned to the surface layer after the liquid is absorbed by the absorbent material. The liquid penetration time is the time taken by the liquid to pass through the surface layer material, which is used to measure the speed of the material transferring the liquid.

[0093] Test instrument: YG814D liquid penetration instrument

[0094] Test method: refer to standard GB / T24218.8-2010 to test the liquid penetration time of both sides of the sample, see Table 2.

[0095] Table 2 Permeability of superabsorbent material

[0096]

[0097] From Table 2, the liquid penetration time of Examples 1-3 is less than that of the comparative example, which is mainly because the absorbent material in contact with the hydrophilic surface exhibits strong hydrophilicity, and the hydrophobic surface and the hydrophilic surface generate a large wetting driving force to facilitate the transfer of liquid to the absorbent material. When the liquid is transferred from the hydrophilic surface, only the hydrophilicity of the absorbent material plays a role, resulting in a weak pressure difference, making it difficult for the liquid to transfer. Therefore, the addition of a certain amount of hydrophobic material does not affect the water permeability of the superabsorbent material, but promotes the liquid penetration time, making the liquid permeability better. After adding the hydrophobic cotton fiber, the backflow is also reduced to a certain extent, which is because the hydrophobicity increases the contact angle of the material surface layer, making the viscose fiber surface change from hydrophilic to hydrophobic. The contact between the bamboo fiber surface and the filter paper surface is hydrophilic, forming a wetting gradient effect when the liquid penetrates, thereby having a one-way liquid guiding property, and further reducing the backflow.

[0098] 3. Liquid absorption performance:

[0099] Prepare a superabsorbent material sample with the same specifications and weigh it, record the mass as m0, soak the sample in a container filled with water for 1 hour, then take out the sample and absorb the excess water on the surface with a paper towel, and weigh the wet weight, which is m. Calculate the water absorption capacity according to the following formula, see Table 3;

[0100] Water absorption capacity (g / g) = m-m0; m0 - dry weight of the sample tested, g; m - wet weight of the sample tested, g.

[0101] The blood absorption capacity was tested in the same way, see Table 3;

[0102] Table 3 Liquid absorption capacity

[0103]

[0104] From Table 3, it can be seen that the water and simulated blood absorption capacity of Examples 1-3 are very good, and when the absorption object is changed from water to high viscosity blood, the absorption capacity of Comparative Example 2 decreases significantly, because the porosity of the cotton pulp and the hydrophilic montmorillonite in the comparative example is small, which easily makes the absorption resistance large, while the hollow rate of the kapok fiber in the example is high, the porosity is large, and the pressure difference formed by the large wetting driving force of hydrophobic and hydrophilic enhances the ability to absorb high viscosity liquid.

[0105] 4. Antibacterial performance

[0106] The superabsorbent materials of Examples 1-3 and Comparative Examples 1-5 were prepared into samples of 2 cm x 2 cm, and the antibacterial effect of the chitosan-based superabsorbent material with antibacterial function on E. coli and s. aureus was investigated by the ASTM E2149 method. The test bacteria were inoculated on the test tube slant medium under sterile conditions, and incubated in a 37°C constant temperature incubator for 20 hours. After the bacteria grew, sterile distilled water was added, dissolved, and shaken to form a suspension of bacteria. The samples were inoculated with s. aureus and E. coli in a flask, and incubated at 37°C for 24 hours. The antibacterial effect was observed, and the diameter of the antibacterial ring produced by each strain was measured. Each antibacterial ring was measured 3 times, and each concentration was repeated 3 times to take the average value. The results are shown in Table 4.

[0107] Table 4 Antibacterial capacity

[0108]

[0109] From Table 4, it can be seen that the chitosan-based superabsorbent material with antibacterial function prepared by Examples 1-3 has obvious antibacterial effect on E. coli and s. aureus. Here, the chitosan and oligosaccharide in the superabsorbent material mainly have the antibacterial effect. The chitosan is chemically crosslinked on the acrylic acid, and the oligosaccharide is physically crosslinked and filled on the polymer, so that the antibacterial activity effect is durable, stable and safe. At the same time, the antibacterial performance of the bamboo fiber and the kapok fiber is superimposed, so that the antibacterial performance of the superabsorbent material is more prominent and more soft.

[0110] In conclusion, the prepared chitosan-based high water-absorbing material with antibacterial function has good air permeability, antibacterial activity and water absorption, and the raw materials are environmentally friendly and low in toxicity, so the material has certain application prospect.

[0111] The above description is only used to illustrate the technical solutions of the present application but not limit the present application, and any equivalent modification and change of the technical solutions of the present application made by those skilled in the art should still belong to the scope of the present application as long as it does not deviate from the overall concept of the present application.

Claims

1. A method for preparing a chitosan-based superabsorbent material with antibacterial function, characterized in that... The aforementioned chitosan-based superabsorbent material with antibacterial function comprises three layers: the upper and lower surfaces are plant fiber high-permeability layers, and the middle layer is chitosan-based superabsorbent microspheres with antibacterial function; the plant fiber high-permeability layer is prepared by electrospinning of kapok fiber, bamboo fiber, modified montmorillonite, and polyvinyl alcohol. The aforementioned superabsorbent microspheres comprise the following raw materials: acrylic acid, water, chitosan, chitosan oligosaccharide, 2,2-azobis(2-methylpropylamidine) dihydrochloride, 1-hydroxycyclohexylphenyl ketone, alginate, glutaraldehyde, and a lubricant; the preparation method of the superabsorbent microspheres is as follows: S01, weigh the following raw materials according to the following parts by weight: 15-20 parts of acrylic acid, 60-75 parts of water, 2-6 parts of chitosan, 1-3 parts of chitosan oligosaccharide, add 2,2-azobis(2-methylpropylamidine) dihydrochloride; 1-hydroxycyclohexylphenyl ketone to obtain a mixture; S02, the mixture is placed at 40-80°C for polymerization and crosslinking reaction, and then cooled to obtain the polymer liquid material system; S03, add alginic acid and glutaraldehyde to the polymerization liquid material system, stir rapidly for 3 to 5 minutes until uniform, let stand for 5 to 10 hours to form a viscous material system; heat the material to 75 to 95°C and keep it at that temperature for 8 to 12 hours to form a hard and brittle hydrogel material. S04, add lubricant to hard and brittle hydrogel material, stir at high speed for 30 to 50 minutes to break it up, heat to 95 to 110℃ to dry until hard particles, and finally grind to 60-100 mesh particles to obtain highly absorbent microspheres. The preparation method of the modified montmorillonite is as follows: Add montmorillonite to deionized water, add dilute hydrochloric acid and stir until homogeneous, so that montmorillonite is fully dispersed in the dilute hydrochloric acid solution. Heat to 60°C, add octadecyltrimethylammonium chloride, stir thoroughly, and react for 1-2 hours to obtain a suspension of montmorillonite. Then centrifuge at 3500 rpm, wash 2-3 times with deionized water to remove hydrochloric acid and excess octadecyltrimethylammonium chloride, centrifuge again, and take out the solid mixture at the bottom. At this time, the interlayer spacing of montmorillonite has been expanded due to the action of quaternary ammonium salt. The solid mixture at the bottom was added to deionized water, the pH was adjusted to 6.3-6.5, glycine was added, and the reaction was carried out for 1-2 hours to load the surface of montmorillonite with a negative charge. After completion, the mixture was filtered, dried, and ground to obtain modified montmorillonite. The mass ratio of octadecyltrimethylammonium chloride to montmorillonite is 1:6-8; the mass ratio of glycine to montmorillonite is 1:

10.

2. The method for preparing the chitosan-based superabsorbent material with antibacterial function according to claim 1, characterized in that, The preparation method of the plant fiber high-permeability layer is as follows: S1. Cut the kapok fiber into small pieces using a high-speed shearing machine. Treat the kapok fiber surface with a 2% NaOH aqueous solution for 5-10 minutes. Then wash it with deionized water until neutral to obtain kapok fiber pieces. Put them into a pulping machine for pulping. Add vinyltrimethoxysilane and stir evenly to obtain kapok pulp for later use. The amount of vinyltrimethoxysilane added is 0.1 to 0.3 parts per 100 parts of kapok pulp; the conditions for the stirring reaction are: stirring speed of 800 to 1000 rpm, time of 2 to 3 hours; S2, bamboo fiber is shredded using a high-speed shearing machine, pulped in a pulping machine, then kapok pulp is added and stirred evenly to obtain plant fiber pulp; the plant fiber pulp is homogenized in a high-pressure homogenizer to obtain plant cellulose solution. The mass ratio of kapok fiber to bamboo fiber is 1:8 to 10. S3, Polyvinyl alcohol and deionized water are stirred and heated at 80°C for 80-120 minutes until completely dissolved. Modified montmorillonite is added and stirred for 30-50 minutes to uniformly disperse the modified montmorillonite in the polyvinyl alcohol solution, thus obtaining a polymer solution. The mass ratio of the modified montmorillonite to polyvinyl alcohol is 1:3 to 5; S4. The polymer solution and the plant cellulose solution are mixed at a mass ratio of 1:(2~3), and then electrospinned to obtain a plant fiber high-permeability layer.

3. The method for preparing the chitosan-based superabsorbent material with antibacterial function according to claim 1, characterized in that, The 2,2-azobis(2-methylpropylamidine) dihydrochloride is 2-5 parts per ten thousand of the total material mass; the 1-hydroxycyclohexylphenyl ketone is 2-5 parts per ten thousand of the total material mass; the chitosan oligosaccharide is a chitosan oligosaccharide with a number average molecular weight of 1200-3400; the alginic acid is 1.5-2 times the mass of chitosan; the glutaraldehyde is 65-85% of the mass of chitosan; the lubricant is a mixture of ammonia, polyethylene glycol, glycerin, and aziridine, wherein the mass ratio of ammonia, polyethylene glycol, glycerin, aziridine, and gel material is 150-300:5-15:0.2-0.6:0.01-0.03:

100.

4. The method for preparing the chitosan-based superabsorbent material with antibacterial function according to claim 2, characterized in that, The electrospinning parameters are: voltage of 30kV, receiving distance of 10cm, flow rate of 1mL / h; ambient temperature and humidity of 25℃ and 40%~60%, respectively.

5. A chitosan-based superabsorbent material with antibacterial function prepared by the method according to any one of claims 1 to 4, characterized in that, A three-layer superabsorbent material was prepared, with the upper and lower layers being 0.5-1.0 mm thick plant fiber highly breathable layers, and the middle layer being 1-2 mm thick chitosan-based superabsorbent microspheres with antibacterial function.

6. The application of the chitosan-based superabsorbent material with antibacterial function according to claim 5 in the preparation of the absorbent layer of wound healing patches or sanitary napkins.

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