CN114632182B - Polyurethane foam absorbs core - Google Patents
Polyurethane foam absorbs core Download PDFInfo
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- CN114632182B CN114632182B CN202210324087.2A CN202210324087A CN114632182B CN 114632182 B CN114632182 B CN 114632182B CN 202210324087 A CN202210324087 A CN 202210324087A CN 114632182 B CN114632182 B CN 114632182B
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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
- A61L15/26—Macromolecular compounds obtained otherwise than 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
- A61L15/20—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
-
- 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
-
- 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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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Epidemiology (AREA)
- Hematology (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
The invention belongs to the field of sanitary product materials, and particularly discloses a polyurethane foam absorption core which comprises the following raw materials in percentage by mass: propylene glycol block polyether L-64:3%, propylene glycol block polyether F-68:1.5%, organosilicon leveling agent KMT-5510S:1.5%, emulsifying wax GP200:0.9%, hydrophilic polyurethane prepolymer: 49.1%, deionized water: 44 percent, the polyurethane foam absorbing core body prepared by the technical scheme of the invention is an open-pore polyurethane foam absorbing structure, and has the advantages of simple preparation, strong water absorption, high liquid retention, high rebound resilience and good compression performance.
Description
Technical Field
The invention belongs to the field of sanitary product materials, and particularly relates to a polyurethane foam absorption core body.
Background
With the development of science and technology, polymer materials have entered the aspects of people's life and become an indispensable part of people's life. With the increase of both mental and physical levels, the demand for some things is no longer limited to use for use, wherein people pay more attention to the superiority and safety of materials and products such as sanitary materials and the like.
Conventional disposable sanitary products, including sanitary napkins, menstrual pants, nursing pads and the like, are characterized by having basically three main functional layers: the skin-friendly permeable surface layer, the core body for absorbing the locking liquid and the bottom layer for ventilating and preventing the leakage of the liquid. The surface layer is generally made of non-woven fabric or perforated film material, the bottom layer is made of polyethylene film or composite material of polyethylene film and non-woven fabric, and the absorption core layer is mainly composed of multi-layer composite core body filled with super absorbent resin (SAP resin) or absorption core body formed by mixing fluff pulp and super absorbent resin.
Unlike the traditional method, the invention of the patent is a polyurethane foam absorbing core body, which can surpass the absorption performance of sap resin and become a large material for replacing the sap resin core body. In the prior art, the conventional polyurethane foam is synthesized by reacting oligomer polyol with isocyanate and the like, the foam structural unit generally has hydrophobic property, and the affinity of the foam to water is poor. In order to improve the hydrophilic water absorption capacity of the foam, a water absorbing material is added during the preparation of the foam so as to fill the foam with the water absorbing material, so that the foam has a water absorbing function. The water-absorbing filler comprises: high-molecular water-absorbing resin, modified starch water-absorbing resin, cross-linked polyacrylate, cellulose grafted polyacrylate, modified polyvinyl alcohol, carboxymethyl cellulose and other organic or inorganic water-absorbing substances are also used for improving the water absorption and water locking performance of polyurethane by filling the high-molecular water-absorbing resin (namely sap resin) in a polyurethane resin body by virtue of a high-molecular material layer or hydrophilic sponge. The obtained material has the problems of insufficient resilience, harder material and the like, so that the comfort problem in the use process is influenced on one hand, and the absorption problem of the material performance is influenced by the insufficient resilience on the other hand.
The polyurethane foam absorption core has the characteristics of strong water absorption and high resilience, can be used for absorbing products such as sanitary towels, paper diapers, incontinence briefs, sanitary pad wound dressings and the like, has the advantages of simple preparation, strong water absorption, high liquid retention, high resilience and good compression performance, is mainly applied to the field of sanitary product materials, and can be made into sheets, profiles and the like. Specifically, a polyurethane foam intended to develop high water absorbability can be obtained by further processing the foam by adjusting the formulation to improve the cell opening property of the foam.
Due to the continuous development of science and technology, hydrophilic polymer materials are continuously developed and advanced, hydrophilic polyurethane foams are continuously developed through the exquisite process and preparation, various properties of the foams are continuously developed, improved and enhanced, and the application fields of the foams are wider than those of the foams in the past.
Disclosure of Invention
The primary object of the present invention is to provide a polyurethane foam absorbent core; to provide a new material to replace the sap resin core.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the polyurethane foam absorption core with strong water absorption and high liquid retention of the invention is prepared by mixing the following components in percentage by mass:
(1) propylene glycol block polyether L-64:3 percent
(2) Propylene glycol block polyether F-68:1.5 percent
(3) Organic silicon flatting agent KMT-5510S:1.5 percent
(4) Emulsifying wax GP200:0.9 percent
(5) Deionized water: 44 percent
(6) Hydrophilic polyurethane prepolymer: 49.1 percent
Wherein, the propylene glycol block polyether L-64 is polyoxyethylene and polyoxypropylene block polymer, and is used as a defoaming agent; the propylene glycol block polyether F-68 is polyoxyethylene and polyoxypropylene block polymer and is used as a dispersant; the organic silicon flatting agent KMT-5510S has the function of shrinkage cavity prevention; emulsifying wax GP200 was used as emulsifier.
The hydrophilic polyurethane prepolymer can be used for manufacturing hydrophilic foam dressings, can be used for preparing foam dressings with different properties with different foaming aqueous phases according to application requirements, and has the characteristics of high transparency, soft handfeel of prepared foam, high foaming reaction speed, low temperature rise, high water absorption rate and high liquid retention rate. The performances of the hydrophilic polyurethane prepolymer comprise: the isocyanate group NCO content is 6.3-7.1 percent, the TDI residual rate is less than or equal to 3 percent by weight, and the storage temperature is 15-25 ℃.
The invention also provides a preparation method of the polyurethane foam absorption core body, which is simple in preparation, strong in water absorption, high in liquid retention, high in rebound resilience and good in compression performance, and comprises the following steps:
the method comprises the following steps: weighing L-64, F-68, KMT-5510S and GP200 according to a proportion, putting into a cup, adding 80 ℃ deionized water, heating in a 80 ℃ constant temperature water bath kettle at constant temperature, stirring uniformly, putting into a refrigerator for preserving the layers for minutes, and cooling to room temperature;
step two: weighing a proper amount of hydrophilic polyurethane prepolymer according to a proportion, placing the hydrophilic polyurethane prepolymer in a cup, and stirring the hydrophilic polyurethane prepolymer at a high speed to form a white emulsion;
step three: and on the basis of the second step, fully mixing the mixture obtained in the first step with the mixture obtained in the second step, immediately pouring the mixture into a foaming mold, standing the mixture for 10min, and then putting the mixture into an oven with the temperature of 50-70 ℃ for curing for 1-2 h to obtain the polyurethane foam absorption core with strong water absorption, high liquid retention, high resilience and good compression performance.
The invention has the following advantages:
1. in the prior art, ethylene oxide triol is mostly adopted as polyether polyol, and the polyurethane foam containing more water-absorbing groups can be prepared by propylene glycol block polyether L-64 and propylene glycol block polyether F-68 (namely polyoxyethylene and polyoxypropylene block polymers);
2. the synergistic effect of the polyether polyol and the common general polyether polyol is fully exerted, so that the polyurethane foam has strong water absorption, and the comfortable softness and excellent resilience of the polyurethane are realized, so that the polyurethane foam has excellent performance;
3. the prepared polyurethane foam core has the advantages of strong water absorption, high liquid retention, high rebound resilience and good compression performance, and is simple to prepare, low in cost and beneficial to industrial production; the product has strong absorption capacity, can quickly absorb the secretion of a human body, and has wide application prospect in the field of disposable sanitary products.
Generally, the hydrophilic polyurethane foam absorption core prepared by the invention greatly improves the water absorption rate and the liquid retention rate of polyurethane foam; and the material has high rebound resilience, good compression performance and light weight, and can be used in the fields of daily chemicals, medical dressings and the like.
Detailed Description
The present invention will be better understood and its implementation will be described in detail below.
Example 1
A polyurethane foam absorption core body is composed of the following raw materials in percentage by mass:
(1) propylene glycol block polyether L-64:3 percent
(2) Propylene glycol block polyether F-68:1.5 percent
(3) Organic silicon flatting agent KMT-5510S:1.5 percent
(4) Emulsifying wax GP200:0.9 percent
(5) Deionized water: 44 percent
(6) Hydrophilic polyurethane prepolymer: 49.1 percent
The implementation process comprises the following steps:
1. weighing L-64, F-68, KMT-5100S and GP200 according to a proper proportion, adding proper 80 ℃ deionized water into a plastic beaker 1, and then placing the plastic beaker into an 80 ℃ water bath to heat for 15min at a constant temperature;
2. taking out the plastic beaker 1, and stirring (within 5 min) by using a high-speed stirrer until the liquid is uniformly mixed to form white emulsion;
3. placing the uniformly mixed liquid into a fresh-keeping layer of a refrigerator and standing for 10min, and then taking out the plastic beaker 1 to keep the temperature of the plastic beaker equal to the room temperature;
4. weighing a proper amount of prepolymer in another beaker (a plastic beaker 2) according to the proportion for later use;
5. placing one piece of organic glass on the flat table surface, and placing the other piece of organic glass and the iron block beside the flat table surface for later use;
6. wearing rubber gloves, holding the plastic beaker 1 by two hands, stirring the prepolymer on a high-speed stirrer (the rotating speed is gradually increased to 3000 r/min), and fully stirring the prepolymer;
7. quickly pouring the plastic beaker 2 (the raw material obtained by the steps 1-3) into the fully stirred raw material of the plastic beaker 1 (the stirring time is not too long, and the stirring is carried out until the uniformly mixed milky liquid which is visible to naked eyes is obtained, generally within 5 s-10 s);
8. quickly pouring the mixed emulsion on the organic glass in the step 5, flatly covering another piece of organic glass, and pressing an iron block;
9. standing for 10min, and waiting for foaming and molding of the material;
10. taking the organic glass lightly, taking down the forming material, and then putting the organic glass into a baking oven at 50-70 ℃ for curing for 1-2 h;
11. and taking out the material, and cutting the material into a required shape to obtain the prepared polyurethane foam absorption core body.
Matters of attention
1. The raw materials are distributed for use immediately, and are not used overnight as much as possible.
2. The emulsifier GP200 is insoluble at normal temperature and can be melted only by heating, and hot deionized water is needed when the raw material of the plastic beaker 1 is prepared.
3. The raw materials of the plastic beaker 1 and the plastic beaker 2 are mixed and then quickly undergo chemical reaction, so that the mixing steps 6-8 are as quick and continuous as possible.
The absorption performance test method comprises the following steps:
1. experimental equipment
(1) 2 glass beakers;
(2) an electronic balance, the sensing quantity is 0.01g;
(3) 1 stopwatch;
(4) a forceps 2 handle;
(5) a rack for hanging a test sample;
(6) tap water is little;
(7) menses simulant is slightly (red) (preparing reference sanitary towel permeation performance test standard synthetic test solution formula GBT8939-2018 sanitary towel (pad)), and the temperature is (23 +/-2) DEG C;
2. test operation
(1) Cutting 3 materials with the same thickness (4 mm) and the same area (50X 50 mm) on the prepared material, wherein the materials are respectively named as m1 front, m2 front and m3 front;
(2) pouring the prepared water/menstrual blood simulation solution into a glass beaker;
(3) clamping the material with forceps, and completely immersing the material in water/menstrual blood simulated fluid for 5min;
(4) lifting the material to make the material completely leave the liquid level and vertically hang on a rack, and weighing the material after 5min as m1, m2 and m 3;
(3) aiming at different formulas, testing the corresponding absorption time of the example 1, the comparative example 2 and the comparative example 3, and recording the mass before and after absorbing water (simulation liquid); the material formulation of comparative example 1 and comparative example 2 is shown in table 1, and the preparation process is the same as example 1.
Water absorption/liquid multiplying power = (m after-m before) ÷ m before
(II) a liquid retention performance test method:
1. experimental equipment
(1) Toilet paper is little;
(2) an electronic balance with a sensing quantity of 0.01g;
(3) 1 stopwatch;
(4) 1, 5kg of ballasting iron blocks;
2. test operation
(1) Taking the absorption performance test method (aiming at the menses simulant test plate) as test samples after m1, m2 and m3 are finally tested, and recording the mass before m1, m2 and m 3;
(2) weighing 3 parts of 14g +/-2 g of toilet paper;
(3) taking out m1, covering 1 part of toilet paper on the toilet paper, pressing the toilet paper with a weight iron block, and standing for 30 seconds;
(4) after the time is over, quickly removing the iron blocks, weighing the iron blocks, and testing the iron blocks after m1, m2 and m 3;
liquid retention rate = (after m test-before m test) ÷ before m test
And (III) experimental verification:
based on the experimental procedure, we performed a formulation change test and the resulting absorption properties are shown in table 1 below:
the method for testing the performance of the prepared polyurethane foam mainly comprises the following steps:
and (3) water absorption measurement: sanitary napkins (pantiliners) according to GBT 8939-2018;
1. experimental equipment
(1) 2 glass beakers;
(2) an electronic balance with a sensing quantity of 0.01g;
(3) 1 stopwatch;
(4) a pair of tweezers 2;
(5) a rack for hanging a test sample;
(6) tap water is little;
2. test procedure
(1) The above test involves 3 test groups, respectively designated as A1 (example 1), A2 (comparative example 1), A3 (comparative example 2), each group tested consistently as (2) - (5);
(2) 3 materials with the same thickness (4 mm) and the same area (50X 50 mm) are cut on the prepared material with the same formula and are respectively named as m1 front, m2 front and m3 front;
(2) pouring tap water prepared in advance into a glass beaker;
(3) clamping the material with tweezers, and completely immersing the material in tap water for 5min;
(4) lifting the material to make the material completely leave the liquid level and vertically hang on a rack, and weighing the material after 5min as m1, m2 and m 3;
(5) calculating the water absorption multiplying power and comparing the absorption performance;
obtaining: water absorption rate example 1 > comparative example 2;
and (3) measuring the liquid absorption rate: sanitary napkins (pantiliners) according to GBT 8939-2018;
1. experimental equipment
(1) 2 glass beakers;
(2) an electronic balance with a sensing quantity of 0.01g;
(3) 1 stopwatch;
(4) a forceps 2 handle;
(5) a rack for hanging a test sample;
(6) menses simulant is slightly (red) (preparing reference sanitary towel permeation performance test standard synthetic test solution formula GBT8939-2018 sanitary towel (pad)), and the temperature is (23 +/-2) DEG C;
2. test operation
(1) The test relates to 3 groups of test, namely A1 (example 1), A2 (comparative example 1) and A3 (comparative example 2), and the test method of each group is consistent as (2) -5;
(2) cutting 3 materials with the same thickness (4 mm) and the same area (50X 50 mm) on the prepared material with the same formula, and respectively naming the materials as m1 front, m2 front and m3 front;
(2) pouring the menses simulant prepared in advance into a glass beaker;
(3) clamping the material with forceps, and completely immersing the material in menstrual blood simulated fluid for 5min;
(4) lifting the material to make the material completely leave the liquid level, vertically suspending the material on a rack, and weighing the material after 5min as m1, m2 and m 3;
(5) calculating the water absorption multiplying power and comparing the absorption performance;
obtaining: liquid absorption rate example 1 > comparative example 2;
rebound resilience test
1. Experimental equipment
(1) A vacuum extractor;
(2) vacuum bag pumping;
(3) 1 stopwatch;
2. test procedure
(1) Cutting 3 materials with the same thickness (50 mm) and the same area (50X 50 mm) on the prepared material with the same formula;
(2) respectively filling the materials into vacuum bags, and vacuumizing and sealing;
(3) standing for 15 minutes, opening a vacuum bag, taking out the material, and observing the recovery condition of the material;
(4) the materials of different formulas can recover to about 50X50X50mm in 30 seconds;
from the above tests and data analysis, the polyurethane foam absorbent core prepared according to the formulation proportion of example 1 of the present invention has the highest water absorption rate and liquid absorption rate, and the standard water absorption rate is not less than 7 in terms of GBT8939-2018, which is much higher than the above value, because the hydrophilic polyurethane foam absorbent core prepared according to the present invention has both high water absorption and high water retention, and the crosslinked network structure thereof gives a good material performance, and has wide applications in the fields of daily life chemicals, medical dressings, etc.
At present, almost no ultrathin sanitary towel products have the characteristics of strong water absorption and high liquid locking in the market. The hydrophilic polyurethane foam absorption core mainly refers to the absorption body part of the sanitary towel, and the core is prepared by a unique formula. The process special effect of the special core body is achieved through a simple process flow, and the purpose is to enable the sanitary towel to become light, thin and non-inductive and to be more suitable for a human body. Through such core structure, can promote the rapid infiltration of menses, reduce the surface and be detained, bring the dry and comfortable use experience of cutting one's body for the user.
Claims (3)
1. A polyurethane foam absorption core is characterized by comprising the following raw materials in percentage by mass: propylene glycol block polyether L-64:3%, propylene glycol block polyether F-68:1.5%, organosilicon leveling agent KMT-5510S:1.5%, emulsifying wax GP200:0.9 percent, hydrophilic polyurethane prepolymer: 49.1%, deionized water: 44%;
the polyurethane foam absorbing core is used for a sanitary towel, a diaper, a sanitary pad or a sanitary suppository absorbing core layer.
2. The polyurethane foam absorbent core as claimed in claim 1, wherein the hydrophilic polyurethane prepolymer is prepared under the following conditions: 6.3 to 7.1 percent of isocyanate group NCO, less than or equal to 3 percent of TDI residual rate and 15 to 25 ℃ of storage temperature.
3. A method of making a polyurethane foam absorbent core as claimed in claim 1 or 2, including the steps of:
the method comprises the following steps: weighing L-64, F-68, KMT-5510S and GP200 according to a proportion, putting into a cup, adding 80 ℃ deionized water, heating in a 80 ℃ constant-temperature water bath kettle at a constant temperature, stirring uniformly, putting into a refrigerator for preserving the freshness for a plurality of minutes, and cooling to room temperature;
step two: weighing the hydrophilic polyurethane prepolymer according to a proportion, placing the hydrophilic polyurethane prepolymer in a cup, and stirring the hydrophilic polyurethane prepolymer into a white emulsion state by using a high-speed dispersion grinder;
step three: and on the basis of the second step, fully mixing the mixture obtained in the first step with the mixture obtained in the second step, immediately pouring the mixture into a foaming mold, standing the mixture for 10min, and then putting the mixture into an oven with the temperature of 50-70 ℃ for curing for 1-2 h to obtain the polyurethane foam absorbing core.
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| CN202210324087.2A CN114632182B (en) | 2022-03-30 | 2022-03-30 | Polyurethane foam absorbs core |
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| CN202210324087.2A CN114632182B (en) | 2022-03-30 | 2022-03-30 | Polyurethane foam absorbs core |
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| CN114632182B true CN114632182B (en) | 2022-12-27 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1741824A (en) * | 2002-10-29 | 2006-03-01 | 株式会社Biopol | Polyurethane foam dressing for wound filler and method for man ufacturing thereof |
| CN105153393A (en) * | 2015-08-04 | 2015-12-16 | 李明莹 | Hydrophilic and biological safe polymer foam, and preparation method and application of polymer foam |
| CN108355162A (en) * | 2018-05-14 | 2018-08-03 | 江西省科学院应用化学研究所 | A kind of antibacterial hydrophilic polyurethane foam medical dressing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100777908B1 (en) * | 2006-12-19 | 2007-11-28 | 주식회사 바이오폴 | Moisturizing improved polyurethane foam dressing |
| EP2179749B1 (en) * | 2008-10-23 | 2012-08-08 | Paul Hartmann AG | Polyurethane gel foams |
| CN103436007B (en) * | 2013-09-06 | 2016-04-13 | 泉州源利鞋材有限公司 | A kind of water suction flexible PU foam and preparation method thereof |
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2022
- 2022-03-30 CN CN202210324087.2A patent/CN114632182B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1741824A (en) * | 2002-10-29 | 2006-03-01 | 株式会社Biopol | Polyurethane foam dressing for wound filler and method for man ufacturing thereof |
| CN105153393A (en) * | 2015-08-04 | 2015-12-16 | 李明莹 | Hydrophilic and biological safe polymer foam, and preparation method and application of polymer foam |
| CN108355162A (en) * | 2018-05-14 | 2018-08-03 | 江西省科学院应用化学研究所 | A kind of antibacterial hydrophilic polyurethane foam medical dressing |
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| CN114632182A (en) | 2022-06-17 |
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