CN111705430A - High-strength polyurethane waterproof moisture-permeable film and preparation method thereof - Google Patents
High-strength polyurethane waterproof moisture-permeable film and preparation method thereof Download PDFInfo
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- CN111705430A CN111705430A CN202010447615.4A CN202010447615A CN111705430A CN 111705430 A CN111705430 A CN 111705430A CN 202010447615 A CN202010447615 A CN 202010447615A CN 111705430 A CN111705430 A CN 111705430A
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
- D01D5/0084—Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/09—Addition of substances to the spinning solution or to the melt for making electroconductive or anti-static filaments
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/94—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of other polycondensation products
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
- D04H1/4358—Polyurethanes
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H13/00—Other non-woven fabrics
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/009—Condensation or reaction polymers
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/02—Moisture-responsive characteristics
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2501/00—Wearing apparel
- D10B2501/04—Outerwear; Protective garments
- D10B2501/043—Footwear
Abstract
The invention relates to a high-strength polyurethane waterproof moisture-permeable film and a preparation method thereof. The polyurethane waterproof moisture-permeable film obtained by the invention has better mechanical property and waterproof moisture-permeable property, and can be widely applied in the field of waterproof moisture-permeable.
Description
Technical Field
The invention belongs to the field of waterproof moisture-permeable films and preparation thereof, and particularly relates to a high-strength polyurethane waterproof moisture-permeable film and a preparation method thereof.
Background
The waterproof moisture permeable microporous membrane has the structural characteristics of allowing water vapor to pass through but not allowing water drops to enter, has attracted attention of a plurality of researchers in recent years, is widely applied to aspects of sportswear, tents, filtration and the like, and is particularly favored in clothing application. In general, the waterproof moisture permeability of microporous membranes is obtained by a synergistic effect between a hydrophobic surface and a porous structure, which not only prevents water droplets from penetrating but also provides interconnecting channels for water vapor transmission. At present, waterproof moisture-permeable microporous films on the market are mainly prepared by methods such as thermal stretching, coating and laminating, but the methods face a plurality of problems such as complicated preparation process, inflexible adjustment of porous structure and the like. Polyurethane (PU) has a soft-hard segment co-embedded structure and excellent physical and chemical properties, and the microporous membrane prepared by taking PU as a raw material and utilizing an electrostatic spinning technology has higher research value when being applied to the field of water resistance and moisture permeability.
Due to the characteristics of the electrostatic spinning technology, the electrostatic spinning nanofiber material generally has the defect of insufficient mechanical strength, and the application of the electrostatic spinning nanofiber material in a specific field is limited. The research of the multi-wall carbon nano-tubes (MWNTs) in the field of polymer composite materials is active, the mechanical property and the thermal property of the fiber material are improved by adding the carbon nano-tubes, and the research and application values are good. As a reinforcement, it must be tightly bonded to the polymer matrix in order for the stresses to be effectively transmitted to the reinforcement.
The specification of patent application No. 201510703925.7 discloses a "high-strength electrospun nanofiber preparation technology" for preparing high-strength electrospun nanofibers by using an ultrasonic technology, which can realize electrospinning of a high-viscosity polymer solution and improve the crystalline structure and molecular orientation degree of electrospun nanofibers, thereby obtaining high-strength electrospun nanofibers. However, this technique is limited to the improvement of the mechanical properties of nanofibers and has not been applied to the improvement of the strength of waterproof moisture-permeable films.
The specification of patent application No. 201910606694.6 discloses a "preparation method of a waterproof moisture-permeable nanofiber composite membrane", which is to add polyacrylonitrile, polyvinylidene fluoride and polyurethane into N, N-dimethylformamide, add polydimethylsiloxane and modified nano-silica into a polymer solution, obtain a spinning solution by adopting an ultrasonic technology, and obtain a nanofiber membrane by using an electrostatic spinning device, but the mechanical properties of the nanofiber membrane are not effectively improved.
CN102604370A discloses an intelligent waterproof moisture-permeable material and a preparation method thereof, wherein a base material and a waterproof moisture-permeable functional material are prepared into an intelligent high-molecular film material with all-weather waterproof moisture-permeable function by a screw extruder under a certain temperature condition according to a certain mixing ratio by adopting a film blowing method or a tape casting method. The balance of the waterproof moisture-permeable membrane is improved by regulating and controlling the sizes of the inorganic nano particles and the polymer micro-area, the size of the optimal particles is not easy to master, and the nano effect can be shown only when the size is small to a certain size, so that the porosity is not high, and the moisture permeability is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-strength polyurethane waterproof moisture-permeable membrane and a preparation method thereof, aiming at overcoming the defect of low strength of the waterproof moisture-permeable membrane in the prior art.
The polyurethane waterproof moisture-permeable film is obtained by electrostatic spinning of raw materials containing polyurethane, quaternary ammonium salt and multi-walled carbon nano tubes.
The polyurethane is polyurethane 1190A 10.
The quaternary ammonium salt is dodecyl trimethyl ammonium chloride.
The particle size of the multi-wall carbon nano tube is 10-15 nm.
The average thickness of the waterproof moisture-permeable film is 20-25 μm.
The invention discloses a preparation method of a polyurethane waterproof moisture-permeable film, which comprises the following steps:
dissolving polyurethane in a solvent, adding quaternary ammonium salt and carbon nano tube MWNTs, carrying out ultrasonic treatment and stirring to obtain electrostatic spinning solution, and carrying out electrostatic spinning by taking non-woven fabric as a receiving device to obtain the polyurethane waterproof moisture-permeable film.
The preferred mode of the above preparation method is as follows:
the quaternary ammonium salt is added, so that the conductivity of the nanofiber is improved, and the diameter of the nanofiber is reduced.
The solvent is a single solvent system or a binary solvent system.
The solvent is dimethylformamide, or acetone/dimethylformamide; wherein the volume ratio of acetone to dimethylformamide in the acetone/dimethylformamide is 1: 1-2: 1.
the mass percentage concentration of polyurethane in the electrostatic spinning solution is 16-18%, the mass percentage concentration of quaternary ammonium salt is 0.5-1.0%, and the mass percentage concentration of the multi-walled carbon nano tube is 0.1-0.3%.
The ultrasonic treatment power is 100-1000W, the working frequency is 12-30 kHz, and the spinning solution is subjected to ultrasonic treatment for 20-30 min.
The electrostatic spinning process parameters are as follows: and (3) spinning for 4-8h under the conditions that the applied voltage is 50-60 kV, the ambient temperature is 23-25 ℃, and the ambient humidity is 40-65% RH.
The polyurethane waterproof moisture-permeable film is applied to the fabrics of sports shoes.
Advantageous effects
(1) The invention takes polyurethane as a main raw material, the polyurethane is a block polymer, polar groups such as hydrophilic groups and the like existing on a macromolecular chain segment provide a carrier for water vapor transfer, and meanwhile, hydrophobic groups on the chain segment also enable the polyurethane to have certain hydrophobic property, and the unique block macromolecular structure and excellent physical and chemical properties of the polyurethane are regarded as excellent raw materials for preparing the waterproof moisture-permeable nanofiber membrane.
(2) According to the invention, the conductivity of the polymer solution is improved by adding the dodecyl trimethyl ammonium chloride, and the conductivity of the polymer solution influences electrostatic repulsion, so that the morphological characteristics of the electrostatic spinning fibers can be further influenced. After the dodecyl trimethyl ammonium chloride is added, the diameter of the nano fiber is reduced, so that the porosity of the nano fiber is improved, and the waterproof moisture-permeable film has good moisture permeability.
(3) The strength of the nanofiber is improved by adding the multi-walled carbon nanotube, the nanofiber is limited to be widely applied in the textile field due to low strength, and the carbon nanotube has remarkable mechanical property, high heat resistance and strong conductivity, so that the carbon nanotube becomes an excellent reinforcing material. In addition, in order to uniformly disperse the nano particles, the spinning solution is treated by adopting an ultrasonic technology, so that the dispersion degree of the reinforcement material in the polymer is improved, and the mechanical property of the waterproof moisture-permeable membrane can be effectively improved.
(4) The invention adopts an electrostatic spinning method to prepare a waterproof moisture-permeable nanofiber membrane, the electrostatic spinning technology is that a charged polymer solution or a melt forms suspended liquid drops under the synergistic action of self gravity, self viscosity and surface tension, the charged liquid drops are subjected to the stretching action of electric field force in an electrostatic field and are sprayed into thin flows, solidification is carried out in the stretching process, finally, a fiber product is obtained at a receiving end, polymer jet flow is stretched at high speed under the action of the electrostatic field, and finally, the polymer jet flow is deposited on a receiving base material. The nanofiber prepared by the electrostatic spinning technology has large specific surface area and high porosity, so the nanofiber has good moisture permeability.
(5) The breaking strength of the waterproof moisture-permeable nanofiber membrane obtained in the invention is 100-1000 MPa, the breaking elongation is 300-700%, the water pressure resistance is 5000-15000 Pa, and the moisture permeability is 6000-15000 g/(m 2.24 h).
Drawings
FIG. 1 is a scanning electron micrograph of a nanofiber membrane prepared in example 1 of the present invention;
fig. 2 is a strength test chart of the high-strength polyurethane waterproof moisture-permeable film prepared in example 1 of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The manufacturers and specifications of the reagents used in the examples, and some of the test instruments and manufacturers, are as follows:
polyurethane (1190a10), basf polyurethane specialty ltd, china; n, N-dimethylformamide (DMF, purity 99.0%), shanghai linkup chemical reagent, ltd; MWNT-10(10-15nm), Achima, France; 84-1A magnetic stirrer, Shanghai Spira instruments, Inc.; nonwoven fabric (thickness of 0.1mm-0.5mm, width of 1.32m), Shanghai Shenda nonwoven fabric manufacturing Co., Ltd; electrospinning machine (KDS-220), KDS Scientific
Example 1
The preparation method of the high-strength polyurethane waterproof moisture-permeable film comprises the following specific steps:
step 1: preparing electrostatic spinning solution, dissolving 16% of polyurethane (1190A10) in dimethyl formamide, adding 0.5% of dodecyl trimethyl ammonium chloride to improve the conductivity, wherein the conductivity is 45 mu S/cm, and the diameter of the nanofiber is reduced. Adding MWNTs (10-15nm) with the mass fraction of 0.1%, treating the spinning solution by using ultrasonic waves with the power of 300W for 30min, and uniformly stirring to obtain the electrostatic spinning solution.
Step 2: spinning the spinning solution prepared in the step 1 on a large spinning machine for 8 hours by using an electrostatic spinning method, and taking a non-woven fabric as a receiving device to obtain a polyurethane waterproof moisture-permeable film; wherein the spinning parameters are as follows: the applied voltage was 50kV, the ambient temperature was 25 ℃ and the ambient humidity was 40% RH. Scanning electron micrograph of nanofiber membrane as shown in fig. 1, the fiber membrane in which fibers are stacked has a three-dimensional network structure. The waterproof moisture-permeable film had an average thickness of 20 μm, contained no nonwoven fabric, and the sample used for the test contained no nonwoven fabric. The average diameter of the nanofibers was 350nm and the porosity was 55%.
Example 2
The preparation method of the high-strength polyurethane waterproof moisture-permeable film comprises the following specific steps:
step 1: preparing an electrostatic spinning solution, dissolving 16% of polyurethane (1190A10) in an acetone/dimethylformamide system, wherein the volume ratio of acetone to dimethylformamide is 2:1, and adding 1.0% of dodecyl trimethyl ammonium chloride to improve the conductivity, wherein the conductivity is 50 mu S/cm. Adding MWNTs (10-15nm) with the mass fraction of 0.1%, treating the spinning solution by using ultrasonic waves with the power of 300W for 30min, and uniformly stirring to obtain the electrostatic spinning solution.
Step 2: spinning the spinning solution prepared in the step 1 on a large spinning machine for 8 hours by using an electrostatic spinning method, and taking a non-woven fabric as a receiving device to obtain a polyurethane waterproof moisture-permeable film; wherein the spinning parameters are as follows: the applied voltage was 50kV, the ambient temperature was 25 ℃ and the ambient humidity was 40% RH. The waterproof moisture-permeable film had an average thickness of 20 μm, contained no nonwoven fabric, and the sample used for the test contained no nonwoven fabric. The average diameter of the nanofibers was 320nm and the porosity was 58%.
Example 3
The preparation method of the high-strength polyurethane waterproof moisture-permeable film comprises the following specific steps:
step 1: preparing an electrostatic spinning solution, dissolving 16% of polyurethane (1190A10) in an acetone/dimethylformamide system, wherein the volume ratio of acetone to dimethylformamide is 1:1, and adding 0.5% of dodecyl trimethyl ammonium chloride to improve the conductivity, wherein the conductivity is 45 mu S/cm. Adding MWNTs (10-15nm) with the mass fraction of 0.2%, treating the spinning solution by using ultrasonic waves with the power of 300W for 30min, and uniformly stirring to obtain the electrostatic spinning solution.
Step 2: spinning the spinning solution prepared in the step 1 on a large spinning machine for 8 hours by using an electrostatic spinning method, and taking a non-woven fabric as a receiving device to obtain a polyurethane waterproof moisture-permeable film; wherein the spinning parameters are as follows: the applied voltage was 50kV, the ambient temperature was 25 ℃ and the ambient humidity was 40% RH. The waterproof moisture-permeable film had an average thickness of 20 μm, contained no nonwoven fabric, and the sample used for the test contained no nonwoven fabric. The average diameter of the nanofibers was 370nm and the porosity was 50%.
Comparative example: the intelligent waterproof moisture-permeable film prepared by CN 102604370A.
Example 1, example 2 and example 3 of CN102604370A were used as comparative example 1, comparative example 2 and comparative example 3, respectively.
The waterproof moisture-permeable films prepared in the examples and the comparative examples were tested, and the specific test was as follows:
testing waterproof moisture permeability: according to GB/T4744-19887 hydrostatic test for measuring water permeability of textile fabrics, carrying out hydrostatic pressure resistance (YG825E type digital water permeability tester) test on the nanofiber membrane, selecting a pressurization method, wherein the pressurization speed is 1.0KPa/min, and taking an average value to represent the waterproof performance of the fiber membrane; testing the moisture permeability of the nanofiber membrane by using a YG601-I type computer type fabric moisture permeameter according to the standard GB/T12704-91 moisture permeability cup method/method A moisture absorption method for fabric moisture permeability determination method; and (3) testing tensile property: referring to GB/T1040.1-2006 Plastic tensile Property determination, a sample is cut into strips with the width of 10mm, the tensile property of the fiber membrane is tested by using an Instron5582, the effective tensile length is 25mm, the tensile speed is 5mm/min, and the mechanical property of the nanofiber membrane is represented by taking the average value.
The specific test results are shown in table 1.
Table 1 comparative table of property characterization
| Item | Water pressure resistance/Pa | Moisture permeability/m2·24h | Breaking strength/MPa | Elongation at break/% |
| Example 1 | 7500 | 8000 | 130 | 400 |
| Example 2 | 7962 | 8200 | 135 | 555 |
| Example 3 | 8276 | 7423 | 120 | 500 |
| Comparative example 1 | >10000 | 5024 | 42 | 550 |
| Comparative example 2 | >10000 | 4236 | 46 | 465 |
| Comparative example 3 | >10000 | 3292 | 48 | 420 |
As can be seen from Table 1, the waterproof moisture-permeable film prepared by the invention has good waterproof moisture-permeable performance and mechanical performance.
Claims (10)
1. The polyurethane waterproof moisture-permeable film is characterized by being prepared from raw materials comprising polyurethane, quaternary ammonium salt and multi-walled carbon nano tubes through electrostatic spinning.
2. The waterproof moisture-permeable film according to claim 1, wherein the polyurethane is 1190A 10.
3. The waterproof moisture-permeable film according to claim 1, wherein the quaternary ammonium salt is dodecyl trimethyl ammonium chloride.
4. The waterproof moisture-permeable film according to claim 1, wherein the multi-walled carbon nanotubes have a particle size of 10 to 15 nm.
5. The waterproof moisture-permeable film according to claim 1, wherein the average thickness of the waterproof moisture-permeable film is 20 to 25 μm.
6. A preparation method of a polyurethane waterproof moisture-permeable film comprises the following steps:
dissolving polyurethane in a solvent, adding quaternary ammonium salt and carbon nano tube MWNTs, carrying out ultrasonic treatment and stirring to obtain electrostatic spinning solution, and carrying out electrostatic spinning by taking non-woven fabric as a receiving device to obtain the polyurethane waterproof moisture-permeable film.
7. The method according to claim 6, wherein the solvent is dimethylformamide, or acetone/dimethylformamide; wherein the volume ratio of acetone to dimethylformamide in the acetone/dimethylformamide is 1: 1-2: 1.
8. the preparation method according to claim 6, wherein the mass percent concentration of the polyurethane in the electrospinning solution is 16-18%, the mass percent concentration of the quaternary ammonium salt is 0.5-1.0%, and the mass percent concentration of the carbon nanotube MWNTs is 0.1-0.3%.
9. The preparation method according to claim 6, wherein the electrostatic spinning process parameters are as follows: and (3) spinning for 4-8h under the conditions that the applied voltage is 50-60 kV, the ambient temperature is 23-25 ℃, and the ambient humidity is 40-65% RH.
10. Use of the polyurethane waterproof moisture-permeable film according to claim 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112575444A (en) * | 2020-11-23 | 2021-03-30 | 南通纺织丝绸产业技术研究院 | High-protection high-moisture-permeability nanofiber membrane and preparation of medical protective equipment thereof |
| CN114541040A (en) * | 2022-01-21 | 2022-05-27 | 新疆大学 | Preparation method of cobweb-structure blended waterproof moisture-permeable film |
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