CN116199912A - Gamma-polyglutamic acid super absorbent resin and preparation method and application thereof - Google Patents
Gamma-polyglutamic acid super absorbent resin and preparation method and application thereof Download PDFInfo
- Publication number
- CN116199912A CN116199912A CN202310114764.2A CN202310114764A CN116199912A CN 116199912 A CN116199912 A CN 116199912A CN 202310114764 A CN202310114764 A CN 202310114764A CN 116199912 A CN116199912 A CN 116199912A
- Authority
- CN
- China
- Prior art keywords
- gamma
- polyglutamic acid
- absorbent resin
- super absorbent
- nisin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
- A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/04—Polyamides derived from alpha-amino carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Epidemiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
The invention relates to the technical field of paper diaper cores, in particular to gamma-polyglutamic acid super absorbent resin and a preparation method and application thereof, wherein the preparation method comprises the following steps: preparing aqueous solution of nisin; preparation of an aqueous gamma-polyglutamic acid solution: dissolving gamma-polyglutamic acid in water, and fully stirring until the gamma-polyglutamic acid is completely dissolved; adding aqueous solution of nisin into aqueous solution of gamma-polyglutamic acid to obtain mixed solution, regulating pH, adding a cross-linking agent, standing for a period of time at room temperature, heating to 40-60 ℃, and continuing to react to obtain a gelatinous product; and (3) dehydrating the gel product by using absolute ethyl alcohol, drying under vacuum and negative pressure, and crushing the obtained dried product to obtain the gamma-polyglutamic acid super absorbent resin powder. The gamma-polyglutamic acid super absorbent resin provided by the invention takes gamma-polyglutamic acid and nisin as raw materials, and the prepared paper diaper core has strong water absorption performance and is easy to degrade, so that the environment pollution is reduced, and meanwhile, the skin microecology can be regulated, and the skin irritation is avoided.
Description
Technical Field
The invention relates to the technical field of paper diaper cores, in particular to gamma-polyglutamic acid super absorbent resin and a preparation method and application thereof.
Background
Along with the development of economy and the improvement of national living standard, the sanitary articles industry in China is subject to high-speed growth in the last two thirties. Wherein the diaper product gives the baby a soft and comfortable feel and also eliminates the trouble of cleaning the diaper for the mother. Modern diapers generally consist of three main parts: surface covering layer, absorbent core layer and base fabric. Wherein the absorbent core primarily functions to capture and rapidly absorb urine, disperse urine, or wick it throughout the core, ultimately absorbing and storing urine. The absorbent core layer of the paper diaper in the domestic market mainly comprises a layered structure composed of pure wood pulp (fluff pulp) and super absorbent resin (SAP). The super absorbent resin is prepared from starch and acrylic acid salt as main raw materials. The characteristic of 'diaper' is that the absorption of water and water storage are remarkable, the absorption of physiological saline is 40-60 times of the weight of the diaper, and the absorption of purified water is 50-100 times of the weight of the diaper.
At present, the paper diaper products sold in the market contain a large amount of non-degradable material components, such as polyethylene, polypropylene, water-absorbent resin, hot melt adhesive and the like, and the ecological environment pressure is increased when the products are used in a large amount. The problems are mainly that after the infant wears the paper diaper, excrement and urine remain in the paper diaper due to untimely replacement, various pathogenic bacteria in the excrement and urine adhere to the skin of the buttocks of the infant, so that the skin is stimulated for a long time, harmful microorganisms on the surface of the skin are bred, and accordingly, urea and the excrement are decomposed by bacteria on the skin to generate various harmful metabolic substances, stimulate the skin, and cause red buttocks and the like.
Disclosure of Invention
Aiming at the technical problems that the materials used by the existing paper diapers are not degradable and easily cause the skin problem of infants, the invention provides gamma-polyglutamic acid super absorbent resin and a preparation method and application thereof.
In a first aspect, the present invention provides a method for preparing a gamma-polyglutamic acid super absorbent resin, comprising the steps of:
(1) Preparation of aqueous nisin solution: dissolving nisin in water, and filtering;
(2) Preparation of an aqueous gamma-polyglutamic acid solution: dissolving gamma-polyglutamic acid in water, and fully stirring until the gamma-polyglutamic acid is completely dissolved;
(3) Crosslinking reaction: adding aqueous solution of nisin into aqueous solution of gamma-polyglutamic acid to obtain mixed solution, regulating pH, adding a cross-linking agent, standing for a period of time at room temperature, heating to 40-60 ℃, and continuing to react to obtain a gelatinous product;
(4) And (3) dehydrating the gel product by using absolute ethyl alcohol, drying under vacuum and negative pressure, and crushing the obtained dried product to obtain the gamma-polyglutamic acid super absorbent resin powder.
The structure of the water-soluble polyamino acid produced by microbial fermentation in nature is a high molecular polymer with glutamic acid units forming peptide bonds through alpha-amino groups and gamma-carboxyl groups, and compared with synthetic high molecules, the gamma-polyglutamic acid has the advantages of biodegradability, no toxicity, no pollution, easiness in modification, good biocompatibility and the like. Because the molecular structure of the polyglutamic acid contains a large amount of free carboxyl groups, the graft copolymerization reaction of the polyglutamic acid can be easily carried out, and the synthesized water-absorbent resin with the three-dimensional network structure also has the properties of strong water retention and environmental degradation. The final degradation products of the gamma-polyglutamic acid and the super absorbent resin synthesized by the gamma-polyglutamic acid are glutamic acid monomers, so that the gamma-polyglutamic acid and the super absorbent resin are harmless to the natural environment. Meanwhile, the gamma-polyglutamic acid has no immunogenicity to human body, and allergic reaction can be avoided by using the polyglutamic acid as a raw material; the polyglutamic acid contains a large amount of carboxyl groups, has buffering capacity for acid and alkali, can buffer the pH value of urine, enables the contact skin to be in a weak acid environment instead of a weak base environment, and can effectively prevent diaper rash.
Nisin is a natural bioactive antibacterial peptide, is mainly obtained by biological fermentation of lactococcus lactis, and has high-efficiency bactericidal activity. The nisin has the advantages of wide antibacterial spectrum, high sterilization rate, high safety and the like, and the prepared paper diaper has remarkable inhibition effect on skin pathogenic bacteria.
Further, in the step (1), the titer of nisin is 1000-10000 IU/mg, and the addition amount is 0.5-5% of the water mass.
Further, in the step (2), the molecular weight of the gamma-polyglutamic acid is 50-150 ten thousand, and the addition amount is 10-20% of the water mass.
In the step (3), the titer of nisin in the mixed solution is 10-100 IU/mL, and the pH is regulated to 3.0-8.0.
Further, in the step (3), the standing time is 4 hours, and the continuous reaction time is 10-20 hours.
Further, in the step (3), the cross-linking agent is ethylene glycol glycidyl ether, and the addition amount is 0.2% -2.0% of the mass of the gamma-polyglutamic acid.
In a second aspect, the present invention provides a gamma-polyglutamic acid super absorbent resin prepared by the above-described preparation method.
In a third aspect, the invention provides an application of the gamma-polyglutamic acid super absorbent resin in preparing a paper diaper core.
The invention has the beneficial effects that:
according to the gamma-polyglutamic acid super absorbent resin and the preparation method thereof, gamma-polyglutamic acid and nisin are used as raw materials, the prepared paper diaper core is strong in water absorption performance and easy to degrade, has no immunogenicity to human bodies, can solve the environmental pollution caused by using and discarding paper diapers in a large amount, can regulate skin microecology due to the fact that the polyglutamic acid can be used as cosmetics, can avoid irritation of the core to the skin, and can obviously inhibit skin pathogenic bacteria due to the fact that nisin is a natural bioactive antibacterial peptide.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a degradation graph of the gamma-polyglutamic acid super absorbent resin prepared in example 1.
FIG. 2 is a graph showing the results of bacteriostasis experiments in example 1 and example 2.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
(1) Preparation of aqueous nisin solution: 5g nisin (titre 1050 IU/mg) was dissolved in 100mL purified water, pH 3.13, and filtered to give a clear aqueous nisin solution.
(2) Preparation of an aqueous gamma-polyglutamic acid solution: 70 ten thousand molecular weight gamma-polyglutamic acid is dissolved in purified water, and is fully stirred until the gamma-polyglutamic acid is completely dissolved, so as to obtain a gamma-polyglutamic acid aqueous solution with the concentration of 10 percent.
(3) Adding nisin water solution into gamma-polyglutamic acid water solution, adjusting pH to 5.0 with 50IU/mL, and stirring thoroughly.
(4) Crosslinking reaction: adding ethylene glycol glycidyl ether with the addition amount of 2.0 percent of the mass of the gamma-polyglutamic acid, fully and uniformly stirring, standing at room temperature for reaction for 4 hours, heating to 50 ℃, continuously reacting for 12 hours under the condition, obtaining a gelatinous product when the reaction liquid does not flow, and ending the reaction.
(5) Dehydrating and drying: and (3) dehydrating the gel product by using absolute ethyl alcohol, drying under vacuum and negative pressure, and crushing the obtained dried product to obtain the gamma-polyglutamic acid super absorbent resin powder applicable to paper diapers.
Example 2
(1) Preparation of aqueous nisin solution: 1g nisin (titer 7000 IU/mg) was dissolved in 100mL purified water, pH 2.97, and filtered to give a clear aqueous nisin solution.
(2) Preparation of an aqueous gamma-polyglutamic acid solution: dissolving 150 ten thousand molecular weight gamma-polyglutamic acid in purified water, and fully stirring until the gamma-polyglutamic acid is completely dissolved to obtain a gamma-polyglutamic acid aqueous solution with the concentration of 20%.
(3) Adding nisin water solution into polyglutamic acid water solution, adjusting pH to 7.0 with potency of 100IU/mL, and stirring thoroughly.
(4) Crosslinking reaction: adding ethylene glycol glycidyl ether with the addition amount of 0.5% of the mass of the gamma-polyglutamic acid, fully and uniformly stirring, standing at room temperature for 4 hours, heating to 60 ℃, continuously reacting for 10 hours under the condition, obtaining a gelatinous product when the reaction liquid does not flow, and ending the reaction.
(5) Dehydrating and drying: and (3) dehydrating the gel product by using absolute ethyl alcohol, drying under vacuum and negative pressure, and crushing the obtained dried product to obtain the gamma-polyglutamic acid super absorbent resin powder applicable to paper diapers.
Test example 1
1.0g of the gamma-polyglutamic acid super absorbent resin prepared in example 1 and 1.0g of a commercially available polyacrylic acid water absorbent resin (available from Hebei Baodingkehan resin Co., ltd.) were weighed into a 2000mL beaker, 1500mL of deionized water was added, and the mixture was allowed to stand for 24 hours, and the water absorbent gel was filtered out by a 100-mesh metal screen and weighed, and the water absorption capacity was calculated, and the results were shown in Table 1.
Test example 2
1.0g of the gamma-polyglutamic acid super absorbent resin prepared in example 1 and 1.0g of a commercially available polyacrylic acid water absorbent resin (commercially available from Hebei Baodingkehan resin Co., ltd.) were weighed respectively in 2000mL beakers, and 1500mL of artificial urine (according to the standard artificial urine composition adopted by the American agricultural institute: water 97.09%, urea 1.94%, naCl 0.80%, mgSO) was added respectively 4 ·7H 2 O 0.11％，CaCl 2 0.06%), standing for 24 hours, filtering out the absorbent gel by using a 100-mesh metal screen, weighing the absorbent gel, and calculating the artificial urine absorption rate, and the result is shown in Table 1.
Table 1 comparison of Water absorption Properties of Gamma-polyglutamic acid super absorbent resin and commercially available polyacrylic acid Water absorbent resin
| Type of resin | Water absorption rate | Artificial urine absorbing multiplying power |
| Gamma-polyglutamic acid super absorbent resin | 1250 | 150 |
| Commercially available polyacrylic acid water-absorbing resin | 780 | 75 |
As can be seen from table 1, the gamma-polyglutamic acid super absorbent resin provided by the invention is more excellent in water absorption performance and artificial urine absorption performance than the commercially available polyacrylic acid water absorbent resin.
Test example 3 soil burial method for determining degradability of gamma-polyglutamic acid super absorbent resin
Weighing a certain mass (m) 0 Unit g), drying to constant weight, respectively burying the powder into flowerpots filled with fresh soil 2cm away from soil layer, standing at room temperature, periodically taking out 1 mixture of soil and resin in flowerpots, immersing in 75% ethanol solution, slightly rinsing to remove impurities such as mud, washing with deionized water for 1 time, drying to constant weight, recording quality (m 1 Unit g), the retention of the sample is calculated according to the following formula:
according to the calculation result, the degradation curve of the gamma-polyglutamic acid super absorbent resin prepared in example 1 is plotted as shown in FIG. 1. As shown in FIG. 1, the mass loss rate of the gamma-polyglutamic acid super absorbent resin buried in soil for 60 days reaches 99%, so that the super absorbent resin is extremely easy to degrade and can effectively prevent environmental pollution.
Test example 4 determination of the antibacterial Property of Gamma-polyglutamic acid super absorbent resin by the inhibition zone method
The bacteriostasis of the gamma-polyglutamic acid super absorbent resin is shown in figure 2, wherein the indicator bacteria are micrococcus luteus, the pair-1 and pair-2 are bacteriostasis zones generated by adding 10IU nisin, 1-1 and 1-2 are bacteriostasis zones generated by diluting the super absorbent resin prepared in example 1 by 100 times and then taking 100 mug of diluent, and 2-1 and 2-2 are bacteriostasis zones generated by diluting the super absorbent resin prepared in example 2 by 100 times and then taking 100 mug of diluent. As can be seen from fig. 2, the gamma-polyglutamic acid super absorbent resin has remarkable antibacterial property.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (8)
1. The preparation method of the gamma-polyglutamic acid super absorbent resin is characterized by comprising the following steps of:
(1) Preparation of aqueous nisin solution: dissolving nisin in water, and filtering;
(2) Preparation of an aqueous gamma-polyglutamic acid solution: dissolving gamma-polyglutamic acid in water, and fully stirring until the gamma-polyglutamic acid is completely dissolved;
(3) Crosslinking reaction: adding aqueous solution of nisin into aqueous solution of gamma-polyglutamic acid to obtain mixed solution, regulating pH, adding a cross-linking agent, standing for a period of time at room temperature, heating to 40-60 ℃, and continuing to react to obtain a gelatinous product;
(4) And (3) dehydrating the gel product by using absolute ethyl alcohol, drying under vacuum and negative pressure, and crushing the obtained dried product to obtain the gamma-polyglutamic acid super absorbent resin powder.
2. The method according to claim 1, wherein the nisin in the step (1) has a titer of 1000 to 10000IU/mg and is added in an amount of 0.5 to 5% by mass of water.
3. The method according to claim 1, wherein in the step (2), the molecular weight of the gamma-polyglutamic acid is 50 to 150 tens of thousands, and the addition amount is 10 to 20% of the water mass.
4. The method according to claim 1, wherein in the step (3), the nisin titer in the mixed solution is 10 to 100IU/mL, and the pH is adjusted to 3.0 to 8.0.
5. The process according to claim 1, wherein in the step (3), the standing time is 4 hours and the continuous reaction time is 10 to 20 hours.
6. The preparation method according to claim 1, wherein in the step (3), the crosslinking agent is ethylene glycol glycidyl ether, and the addition amount is 0.2% -2.0% of the mass of the gamma-polyglutamic acid.
7. A gamma-polyglutamic acid super absorbent resin produced by the production method according to any one of claims 1 to 6.
8. Use of the gamma-polyglutamic acid super absorbent resin according to claim 7 for preparing a diaper core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310114764.2A CN116199912A (en) | 2023-02-13 | 2023-02-13 | Gamma-polyglutamic acid super absorbent resin and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310114764.2A CN116199912A (en) | 2023-02-13 | 2023-02-13 | Gamma-polyglutamic acid super absorbent resin and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116199912A true CN116199912A (en) | 2023-06-02 |
Family
ID=86514205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310114764.2A Pending CN116199912A (en) | 2023-02-13 | 2023-02-13 | Gamma-polyglutamic acid super absorbent resin and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116199912A (en) |
-
2023
- 2023-02-13 CN CN202310114764.2A patent/CN116199912A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1167366C (en) | Chitosan collagen and calcium alginate compounded spongy biological dressing and its preparation process | |
| JP2001505237A (en) | Super absorbent composition for hygiene products that does not emit unpleasant odor | |
| CN101721691B (en) | Preparation for treating and restoring infective wound surface and preparation method thereof | |
| JP3720084B2 (en) | Water-absorbent resin, method for producing the same, and water-absorbent article | |
| CN104042558B (en) | A kind of feature feminine care wet tissue and preparation method | |
| SE513261C2 (en) | Absorbent articles comprising a synergistic combination of a pH-regulating substance and lactic acid bacteria | |
| CN109513039A (en) | A kind of anti-bacterial hydrogel dressing of the bromide containing imidazoles and its preparation method and application | |
| CN112675353A (en) | Recombinant collagen dressing and preparation method thereof | |
| CN103340722A (en) | Sanitary towel good in water-absorbing performance | |
| CN105435300A (en) | Nano-silk-fibroin-containing antibacterial medical dressing | |
| CN111166931A (en) | Methacrylic acid sericin/chitosan quaternary ammonium salt hydrogel and preparation method and application thereof | |
| CN111675815A (en) | Preparation method of antibacterial super absorbent resin | |
| CN105194713A (en) | Medical sponge with anti-microbial, heal-promoting and anti-adhesion functions and preparation method thereof | |
| CN1775302A (en) | Chitose-gelatine sponge wound dressing preparing method | |
| CN109966540B (en) | Preparation method and application of nano chitin composite calcium alginate medical dressing | |
| CN107789662A (en) | A kind of diaper and preparation method thereof | |
| CN103349592A (en) | Paper diaper with good water-absorbing quality | |
| CN107823699A (en) | Bleeding stopping and adherence preventing film and preparation method thereof | |
| Abad et al. | Emerging applications of radiation-modified carrageenans | |
| CN116199912A (en) | Gamma-polyglutamic acid super absorbent resin and preparation method and application thereof | |
| CN210903699U (en) | Absorbent cotton core and personal hygiene product using same | |
| CN115887732B (en) | Medical gelatin dressing and preparation method thereof | |
| CN112023123A (en) | Antibacterial gel material for oral restoration and preparation method thereof | |
| Haima et al. | Synthesis and characterisation of glutaraldehyde cross-linked κ-carrageenan-gelatin hydrogel | |
| CN107185026B (en) | Preparation method of medical konjac glucomannan antibacterial dressing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |