CN105670030B - A kind of air layer face fabric spongy layer toughening processing method - Google Patents

A kind of air layer face fabric spongy layer toughening processing method Download PDF

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Publication number
CN105670030B
CN105670030B CN201511007169.0A CN201511007169A CN105670030B CN 105670030 B CN105670030 B CN 105670030B CN 201511007169 A CN201511007169 A CN 201511007169A CN 105670030 B CN105670030 B CN 105670030B
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colloidal sol
carboxylated
treatment fluid
carboxylated chitosan
polyurethane sponge
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CN105670030A (en
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赵军伟
林红
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Jiangyin Changjing Garden Wool Textile Co Ltd
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Jiangyin Changjing Garden Wool Textile Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36After-treatment
    • C08J9/40Impregnation
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36After-treatment
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36After-treatment
    • C08J9/40Impregnation
    • C08J9/42Impregnation with macromolecular compounds
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04Polyurethanes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The invention discloses a kind of air layer face fabric spongy layer toughening processing method, including the pretreatment of Alkaline pretreatment, low-temperature plasma, colloidal sol processing.The present invention increases the cross-linking reaction area of colloidal sol and polyurethane sponge surface in subsequent step by increasing the roughness on polyurethane sponge surface;High-energy particle bombardment effect is lower when plasma treatment further to be etched on the surface of polyurethane sponge, and in a large amount of amino of polyurethane sponge surface grafting;Ti O reticular structures in carboxylated chitosan and colloidal sol are deposited on the hybrid film that fiber surface forms one layer of interpenetrating, effectively improve the toughness and resilience performance of polyurethane sponge.

Description

A kind of air layer face fabric spongy layer toughening processing method
Technical field
The present invention relates to fabric technical fields, and in particular to a kind of air layer face fabric spongy layer toughening processing method.
Background technology
Air layer face fabric on the market includes mainly following three kinds at present:First, one kind of weaving auxiliary material, pure-cotton fabric bubble In a kind of chemical solution, the web surface after impregnating has been covered with without several superfine hairs, these fine, soft furs can make web surface Form one layer of very thin air layer;Second is that two kinds of different fabrics are stitched together, gap existing for centre or filling elastic force Crimped fibre;Third, the upper and lower surface of sponge thin slice and wool, cashmere, cotton, silk quality, chemical fiber plus material etc. are glued by adhesive It closes, it is light since porous sponge has good water imbibition, it can play as above two fabric is equivalent or similar warming Effect.
But found in actual use, using air layer face fabric made from sponge after long-time stored collapsed, fabric Fold place screen resilience is insufficient, it is difficult to restore the formation state before folding, and this kind of air layer face fabric be after repeatedly washing and drying, The phenomenon that sponge fluffy degree is declined, and then shorten the service life of air layer face fabric.It is mainly given birth in the prior art in sponge Production initial stage just carries out toughening processing to sponge, as 103641996 A of CN disclose a kind of Compression-resistansponge sponge, Compression-resistansponge sponge and its system Preparation Method, constitutive material are:Trimethylolpropane polyethers 95-105,3,4- dichlorophenyl isocyanate 58-65, nanometer Calcium carbonate 17-23, isopropyl three(Dioctylphyrophosphoric acid acyloxy)Titanate esters 1.0-2.0, triethylene diamine 0.8-1.2, carbon Sour hydrogen ammonium 7.0-9.0, modified Nano Ludox 2.5-3.5 and water 8.0-9.0;The present invention is with trimethylolpropane polyethers and 3,4- Dichlorophenyl isocyanate is major ingredient, has the characteristics that excellent property, elasticity, water imbibition, water resistance, and nano-calcium carbonate, which has, to be increased The effect of tough reinforcement improves sponge compression strength and pressure-proof elasticity modulus, using nano-calcium carbonate to trimethylolpropane polyethers Modification improves the performance of product, enhances the compressive effect of sponge.But the sponge cost of above-mentioned modification is higher, and And as fabric auxiliary material, the sponge used in air layer face fabric is mostly conventional polyurethanes sponge, and usage amount is big.Therefore, having must Toughening improvement is carried out to polyurethane sponge conventional in the prior art.
Invention content
It is an object of the invention to overcome defect existing in the prior art, a kind of toughness and the excellent sky of resilience are provided Gas-bearing formation fabric spongy layer toughening processing method.
To realize above-mentioned technique effect, the technical scheme is that:A kind of air layer face fabric spongy layer toughening processing Method, which is characterized in that include the following steps:
S1:Polyurethane sponge is placed in oxygenation pretreatment liquid and pads processing, heating 2~5h of pretreatment is washed with water, dried It is dry, polyurethane sponge is placed in plasma treatment in low temperature ammonia, application tension discharge frequency is 13. 75MHz, power 100 ~150W, processing time are 20~50s;
S2:Configure carboxylated chitosan colloidal sol treatment fluid:The key component of carboxylated chitosan colloidal sol treatment fluid is carboxyl Change chitosan, organic acid, titanium dioxide and water;
S3:Polyurethane sponge is immersed in carboxylated chitosan colloidal sol treatment fluid and pads processing at least twice, is warming up to 40~60 DEG C, 0.5~2.5h of insulation reaction takes out polyurethane sponge, rolls extra colloidal sol;
S4:Sponge obtained by S3 is cleaned with second alcohol and water successively, is dried at room temperature, the polyurethane sea of toughening processing is obtained It is continuous;
The volume fraction of sulfamic acid is 0.8~2% in the carboxylated chitosan colloidal sol treatment fluid, carboxylated chitosan Ti content in colloidal sol treatment fluid is 0.5~3%.
Preliminary finish is carried out to polyurethane sponge using oxygenation pretreatment liquid, its role is to can increase poly- ammonia by alkali process The roughness of ester sponge surface, and then increase the cross-linking reaction area of colloidal sol and polyurethane sponge surface in subsequent step;Deng from High-energy particle bombardment effect is lower when subprocessing further to be etched on the surface of polyurethane sponge, and big in polyurethane surface grafting The amino of amount, in the polyurethane sponge after carboxylated chitosan colloidal sol treatment fluid impregnation, the processing of carboxylated chitosan colloidal sol Ti-O reticular structures in liquid are deposited on the hybrid film that fiber surface forms one layer of interpenetrating, the amino and carboxylic of sponge surface grafting The pendant carboxylic group of base chitosan is condensed, and stable crosslinking is formed between film and polyurethane sponge, polyurethane surface The flexibility of film spacing carboxylated chitosan film and the rigidity of Ti-O inoranic membranes, therefore the toughness and resilience of polyurethane sponge Get a promotion.
Preferred technical solution is that the oxygenation pretreatment liquid in S1 is sodium hydroxide solution and/or potassium hydroxide solution, and alkali is pre- The weight percent of solute is 8~15% in treatment fluid.Oxygenation pretreatment liquid concentration excess can cause polyurethane sponge surface damage tight Weight, influences the strength of polyurethane sponge, and then influence its service life, and the too low then polyurethane sponge surface of concentration of lye is thick Rugosity increases unobvious, is unfavorable for subsequent grafting and cross-linking reaction.
Preferred technical solution is that the carboxylated chitosan colloidal sol treatment fluid also contains chitosan crosslinked dose of carboxylated, Chitosan crosslinked dose of carboxylated accounts for carboxylated chitosan colloidal sol treatment fluid 0.02~0.2%.Chitosan crosslinked dose of carboxylated can make The cross-linked network that 3 D complex is formed between carboxylated chitosan molecule, further increases the toughness of gained film.
Preferred technical solution is that chitosan crosslinked dose of the carboxylated is selected from glutaraldehyde, glyoxal and ethylene glycol two At least one of glycidol ether.
In order to form uniform colloidal sol dressing liquid, ensure being uniformly distributed for Ti-O reticular structures in colloidal sol dressing liquid, preferably Technical solution be that the preparation method of the carboxylated chitosan colloidal sol treatment fluid is:Carboxylated chitosan is dissolved in organic acid Carboxylated chitosan solution is prepared in solution, and positive four butyl ester of metatitanic acid is slowly added to while stirring in carboxylated chitosan solution, Until solution is clarified, deaeration handles to obtain carboxylated chitosan colloidal sol treatment fluid.
Preferred technical solution is that the organic acid is sulfamic acid.Sulfamic acid molecule can be with carboxylated chitosan point Amino in son is destroyed at salt, the at this time hydrogen bond in carboxylated chitosan molecule, and intermolecular distance increases, and strand is in expansion State, the enhancing of carboxylated chitosan dissolubility, thus homogeneous system is formed in sulfamic acid, be conducive to ammoxidation hair Raw, after butyl titanate is added in system, there is butyl titanate stronger electrophilicity, the weak ester of attack transesterification occurs, while strong Hydrolytic condensation occurs under the conditions of acid, generates Ti-O reticular structures.
Preferred technical solution is that polyurethane sponge pretreatment temperature is 50~60 DEG C in the S1.
Preferred technical solution can also be that the carboxylated chitosan colloidal sol treatment fluid also includes hydroxyl plasticizers, carboxylic The weight percent of plasticizer is 0.05~0.5% in base chitosan colloidal sol treatment fluid.The hydrogen bond and carboxylated of hydroxyl plasticizers Hydrogen bond action occurs for the active amino of chitosan, instead of between original carboxylated chitosan molecule chain or carboxylated chitosan Polarity between titanium colloidal sol hydrogen bond is connect, and is reduced the quantity of rigid connection point in film and is made friendship to keep film more soft loose The film that connection is coated on polyurethane sponge surface is more soft.
Preferred technical solution is that the hydroxyl plasticizers are glycerine and/or ethylene glycol.Using small molecule glycerine and/ Or ethylene glycol, it is easier to occupy tie point between carboxylated chitosan molecule.
The advantages of the present invention are:
The present invention carries out Alkaline pretreatment, low-temperature plasma pretreatment, colloidal sol processing to polyurethane foam successively, increases poly- The roughness of urethane sponge surface, and then increase the cross-linking reaction area of colloidal sol and polyurethane sponge surface in subsequent step;Deng High-energy particle bombardment effect is lower when ion processing further to be etched on the surface of polyurethane sponge, and on polyurethane sponge surface It is grafted a large amount of amino;Ti-O reticular structures in carboxylated chitosan and colloidal sol are deposited on fiber surface one layer of interpenetrating of formation Hybrid film effectively improves the toughness and resilience performance of polyurethane sponge;
Process method step of the present invention is simple, after gained polyurethane sponge is used for air layer face fabric, the rebound of fabric fold place Power is strong, and rebound velocity is fast, and the service life is longer.
Specific implementation mode
With reference to embodiment, the specific embodiment of the present invention is further described.Following embodiment is only used for more Add and clearly demonstrate technical scheme of the present invention, and not intended to limit the protection scope of the present invention.
Embodiment 1:
Embodiment 1(Abbreviation S1, following embodiments are identical)Air layer face fabric with spongy layer toughening processing method include such as Lower step:
S1:Polyurethane sponge is placed in impregnation in oxygenation pretreatment liquid, heating pretreatment 2h is washed with water, dried, will Polyurethane sponge is placed in plasma treatment in low temperature ammonia, and application tension discharge frequency is 13. 75MHz, power 100W, place The reason time is 20s;
S2:Configure carboxylated chitosan colloidal sol treatment fluid:The key component of carboxylated chitosan colloidal sol treatment fluid is carboxyl Change chitosan, organic acid, titanium dioxide and water;
S3:Polyurethane sponge is immersed in carboxylated chitosan colloidal sol treatment fluid and pads processing at least twice, is warming up to 40 DEG C, insulation reaction 0.5h takes out polyurethane sponge, rolls extra colloidal sol;
S4:Sponge obtained by S3 is cleaned with second alcohol and water successively, is dried at room temperature, the polyurethane sea of toughening processing is obtained It is continuous.
The volume fraction of sulfamic acid is 0.8% in the carboxylated chitosan colloidal sol treatment fluid, carboxylated chitosan colloidal sol Ti content in treatment fluid is 0.5%.
Oxygenation pretreatment liquid in S1 is ammonium hydroxide;The preparation method of carboxylated chitosan colloidal sol treatment fluid is:By carboxylated shell Glycan is dissolved in preparation carboxylated chitosan solution in organic acid soln, and positive four butyl ester of metatitanic acid is slowly added to carboxylated while stirring In chitosan solution, until solution is clarified, deaeration handles to obtain carboxylated chitosan colloidal sol treatment fluid;Organic acid is sulfamic acid. Polyurethane sponge pretreatment temperature is 50 DEG C in S1.
Embodiment 2
Embodiment 2 and embodiment 1 difference lies in:
S1:Polyurethane sponge is placed in impregnation in oxygenation pretreatment liquid, heating pretreatment 5h is washed with water, dried, will Polyurethane sponge is placed in plasma treatment in low temperature ammonia, and application tension discharge frequency is 13. 75MHz, power 150W, place The reason time is 50s;
S2:Configure carboxylated chitosan colloidal sol treatment fluid:The key component of carboxylated chitosan colloidal sol treatment fluid is carboxyl Change chitosan, organic acid, titanium dioxide and water;
S3:Polyurethane sponge is immersed in carboxylated chitosan colloidal sol treatment fluid and pads processing at least twice, is warming up to 60 DEG C, insulation reaction 2.5h takes out polyurethane sponge, rolls extra colloidal sol;
S4:Sponge obtained by S3 is cleaned with second alcohol and water successively, is dried at room temperature, the polyurethane sea of toughening processing is obtained It is continuous.
The volume fraction of sulfamic acid is 2% in the carboxylated chitosan colloidal sol treatment fluid, at carboxylated chitosan colloidal sol It is 3% to manage the Ti content in liquid.
Oxygenation pretreatment liquid in S1 is sodium hydroxide solution, and the sodium hydroxide weight percent in sodium hydroxide solution is 8%;Carboxylated chitosan colloidal sol treatment fluid also contains chitosan crosslinked dose of carboxylated, and chitosan crosslinked dose of glutaraldehyde of carboxylated accounts for Carboxylated chitosan colloidal sol treatment fluid 0.02%.Polyurethane sponge pretreatment temperature is 60 DEG C in S1
Embodiment 3
Embodiment 3 is distinguished as with embodiment 2:
S1:Polyurethane sponge is placed in impregnation in oxygenation pretreatment liquid, heating pretreatment 3.5h is washed with water, is dried, Polyurethane sponge is placed in plasma treatment in low temperature ammonia, application tension discharge frequency is 13. 75MHz, power 125W, Processing time is 35s;
S2:Configure carboxylated chitosan colloidal sol treatment fluid:The key component of carboxylated chitosan colloidal sol treatment fluid is carboxyl Change chitosan, organic acid, titanium dioxide and water;
S3:Polyurethane sponge is immersed in carboxylated chitosan colloidal sol treatment fluid and pads processing at least twice, is warming up to 50 DEG C, insulation reaction 1.5h takes out polyurethane sponge, rolls extra colloidal sol;
S4:Sponge obtained by S3 is cleaned with second alcohol and water successively, is dried at room temperature, the polyurethane sea of toughening processing is obtained It is continuous.
The volume fraction of sulfamic acid is 1.4% in the carboxylated chitosan colloidal sol treatment fluid, carboxylated chitosan colloidal sol Ti content in treatment fluid is 1.75%.
Oxygenation pretreatment liquid in S1 is potassium hydroxide solution, and the weight percent of solute is 15% in oxygenation pretreatment liquid;Carboxyl Change chitosan colloidal sol treatment fluid and also contains chitosan crosslinked dose of glyoxal 0.2% of carboxylated;Polyurethane sponge pretreatment temperature in S1 It is 55 DEG C;Carboxylated chitosan colloidal sol treatment fluid includes also hydroxyl plasticizers glycerine, sweet in carboxylated chitosan colloidal sol treatment fluid The weight percent of oil is 0.05%.
Embodiment 4
Embodiment 4 is distinguished as with embodiment 3:Oxygenation pretreatment liquid in S1 is potassium hydroxide solution, in oxygenation pretreatment liquid The weight percent of solute is 11%;Carboxylated chitosan colloidal sol treatment fluid also contains chitosan crosslinked dose of ethylene glycol two of carboxylated Glycidol ether 0.11%;Carboxylated chitosan colloidal sol treatment fluid also includes hydroxyl plasticizers ethylene glycol, carboxylated chitosan colloidal sol The weight percent of glycerine is 0.5% in treatment fluid.
Embodiment 5
Difference lies in carboxylated chitosan colloidal sol treatment fluid also includes hydroxyl plasticizers second two to embodiment 5 with embodiment 4 Alcohol, the weight percent of glycerine is 0.27% in carboxylated chitosan colloidal sol treatment fluid.
Comparative example 1(Abbreviation D1, following comparative examples are identical):Comparative example 1 saves oxygenation pretreatment step;Comparative example 2:Comparative example 2 save low-temperature plasma processing step, and process conditions are the same as embodiment 5.
The performance detection of embodiment, comparative example and olynthus:
1, the weight that polyurethane sponge before and after the processing is compared using weight method increases percentage;
2, sponge is folded, thereon the metering rebound time after the object 1kg, 5min of the weight such as placement;
From trade mark as can be seen that sponge weightening is bigger, the rebound time is shorter, through colloidal sol treated sponge resilience performance It is effectively increased, which can be widely used in the fabric of everyday general purpose.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications Also it should be regarded as protection scope of the present invention.

Claims (8)

1. a kind of air layer face fabric spongy layer toughening processing method, which is characterized in that include the following steps:
S1:Polyurethane sponge is placed in impregnation in oxygenation pretreatment liquid, heating 2~5h of pretreatment is washed with water, dried, will Polyurethane sponge is placed in plasma treatment in low temperature ammonia, and application tension discharge frequency is 13. 75MHz, and power is 100~ 150W, processing time are 20~50s;
S2:Configure carboxylated chitosan colloidal sol treatment fluid:The key component of carboxylated chitosan colloidal sol treatment fluid is carboxylated shell Glycan, sulfamic acid, titanium dioxide and water;
S3:Polyurethane sponge is immersed in carboxylated chitosan colloidal sol treatment fluid and pads processing at least twice, it is warming up to 40~ 60 DEG C, 0.5~2.5h of insulation reaction takes out polyurethane sponge, rolls extra colloidal sol;
S4:Sponge obtained by S3 is cleaned with second alcohol and water successively, is dried at room temperature, the polyurethane sponge of toughening processing is obtained;
The volume fraction of sulfamic acid is 0.8~2% in the carboxylated chitosan colloidal sol treatment fluid, carboxylated chitosan colloidal sol Ti content in treatment fluid is 0.5~3%.
2. air layer face fabric according to claim 1 spongy layer toughening processing method, which is characterized in that the alkali in S1 is pre- Treatment fluid is sodium hydroxide solution and/or potassium hydroxide solution, and the weight percent of solute is 8~15% in oxygenation pretreatment liquid.
3. air layer face fabric according to claim 1 spongy layer toughening processing method, which is characterized in that the carboxylated Chitosan colloidal sol treatment fluid also contains chitosan crosslinked dose of carboxylated, and chitosan crosslinked dose of carboxylated accounts for carboxylated chitosan colloidal sol Treatment fluid 0.02~0.2%.
4. air layer face fabric according to claim 3 spongy layer toughening processing method, which is characterized in that the carboxylated Chitosan crosslinked dose is selected from least one of glutaraldehyde, glyoxal and ethylene glycol diglycidylether.
5. air layer face fabric according to claim 1 spongy layer toughening processing method, which is characterized in that the carboxylated The preparation method of chitosan colloidal sol treatment fluid is:Carboxylated chitosan is dissolved in preparation carboxylated chitosan in sulfamic acid solution Positive four butyl ester of metatitanic acid is slowly added in carboxylated chitosan solution by solution while stirring, until solution is clarified, deaeration is handled Carboxylated chitosan colloidal sol treatment fluid.
6. air layer face fabric according to claim 1 spongy layer toughening processing method, which is characterized in that gather in the S1 Urethane sponge pretreatment temperature is 50~60 DEG C.
7. air layer face fabric according to claim 1 spongy layer toughening processing method, which is characterized in that the carboxylated Chitosan colloidal sol treatment fluid includes also hydroxyl plasticizers, and the weight percent of plasticizer is in carboxylated chitosan colloidal sol treatment fluid 0.05~0.5%.
8. air layer face fabric according to claim 7 spongy layer toughening processing method, which is characterized in that the hydroxyl increases It is glycerine and/or ethylene glycol to mould agent.
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CN108611727A (en) * 2018-03-19 2018-10-02 江阴市长泾花园毛纺织有限公司 A kind of production technology of the two-sided over coating of vicugna
CN108385391B (en) * 2018-04-03 2021-01-29 安徽农业大学 Method for preparing antibacterial cashmere yarns by grafting cashmere through heterogeneous chitosan oxide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190694A (en) * 1975-08-29 1980-02-26 Vyzkumny Ustav Kozedelny Fibered sheet material imitating natural leather and method for continuous manufacture thereof
CN104258451A (en) * 2014-05-19 2015-01-07 山东省医疗器械研究所 Grafted chitosan hemostatic dressing with three-dimensional multi-network structure and preparation method of grafted chitosan hemostatic dressing
CN104592743A (en) * 2015-02-03 2015-05-06 东北林业大学 Preparation method of nanocellulose/polyurethane foam composite elastomer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190694A (en) * 1975-08-29 1980-02-26 Vyzkumny Ustav Kozedelny Fibered sheet material imitating natural leather and method for continuous manufacture thereof
CN104258451A (en) * 2014-05-19 2015-01-07 山东省医疗器械研究所 Grafted chitosan hemostatic dressing with three-dimensional multi-network structure and preparation method of grafted chitosan hemostatic dressing
CN104592743A (en) * 2015-02-03 2015-05-06 东北林业大学 Preparation method of nanocellulose/polyurethane foam composite elastomer

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