CN114753022B - Self-repairing waterproof polylactic acid fiber fabric with core-shell structure - Google Patents
Self-repairing waterproof polylactic acid fiber fabric with core-shell structure Download PDFInfo
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- CN114753022B CN114753022B CN202210291500.XA CN202210291500A CN114753022B CN 114753022 B CN114753022 B CN 114753022B CN 202210291500 A CN202210291500 A CN 202210291500A CN 114753022 B CN114753022 B CN 114753022B
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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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
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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
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
- D01D5/247—Discontinuous hollow structure or microporous structure
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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
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
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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
- D01F1/10—Other agents for modifying properties
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
- D03D15/527—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads waterproof or water-repellent
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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
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
- D10B2331/041—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET] derived from hydroxy-carboxylic acids, e.g. lactones
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention discloses a self-repairing waterproof polylactic acid fiber fabric with a core-shell structure, which is formed by interweaving polylactic acid fibers; the polylactic acid fiber has a core-shell structure, and specifically comprises a core layer, a middle layer and a shell layer, wherein the core layer is polylactic acid, and provides basic mechanical strength for the fiber and the fabric; the middle layer is composed of polylactic acid containing nano particles, wherein the nano particles contain low-surface-energy small molecular compounds to provide hydrophobicity for fibers and fabrics; the shell layer is formed by polylactic acid, has an open pore structure, provides a migration channel of a low-surface-energy compound, and plays a role in self-repairing the hydrophobic property. The invention solves the problem of losing the waterproof property of the prior polylactic acid fiber fabric in the use process and solves the daily life requirement.
Description
Technical Field
The invention belongs to the field of textile fibers, and particularly relates to a self-repairing waterproof polylactic acid fiber fabric with a core-shell structure.
Background
With the attention paid to the environmental problems, the sustainable development concept is better understood, and the fiber products with better environmental protection are favored by the masses, and polylactic acid fibers are a typical representative. The polylactic acid fiber is prepared by taking agricultural products containing starch such as corn, wheat, beet and the like as raw materials, fermenting to generate lactic acid, and then carrying out polycondensation and melt spinning. Polylactic acid fiber is a synthetic fiber which can be planted and planted easily, and waste can be naturally degraded in nature. The ecological fiber can be decomposed into carbon dioxide and water in soil or seawater under the action of microorganisms, does not emit toxic gas and cause pollution when being burnt, and is sustainable ecological fiber. The polyurethane fiber has excellent biodegradability, good strength and rebound resilience, is very suitable for the production of green environment-friendly textiles, has good comprehensive performance for polylactic acid fiber fabrics or fabrics with high polylactic acid fiber content, has the advantages of good hand feeling, drapability, ultraviolet resistance, skin refreshing and ventilation of fabrics, has lower flammability and excellent processability, and is very suitable for the development of clothing fabrics in summer.
However, the waterproof property of the polylactic acid fiber fabric is lost during use, and in order to solve the problem, the present invention provides a self-repairing waterproof polylactic acid fiber fabric having a core-shell structure.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the self-repairing waterproof polylactic acid fiber fabric with the core-shell structure, which has excellent waterproof effect and solves the problem of loss of the waterproof property of the polylactic acid fiber in the background art.
The self-repairing waterproof polylactic acid fiber fabric with the core-shell structure is formed by interweaving polylactic acid fibers, wherein the polylactic acid fibers have the core-shell structure and specifically comprise a core layer, an intermediate layer and a shell layer.
The polylactic acid fiber comprises the following components: the core layer is common polylactic acid, and provides basic mechanical strength for fibers and fabrics; the middle layer is composed of polylactic acid containing nano particles, wherein the nano particles contain low-surface-energy small molecular compounds to provide hydrophobicity for fibers and fabrics; the shell layer is formed by polylactic acid, has an open pore structure, provides a migration channel of a low-surface-energy compound, and plays a role in self-repairing the hydrophobic property.
Further, the mass ratio of the polylactic acid in the core layer, the middle layer and the shell layer of the polylactic acid fiber is 5:3:2. The diameter of the polylactic acid fiber is 30-120 mu m.
In the middle layer of the polylactic acid fiber, the mass ratio of the nano particles to the polylactic acid is 1:10-1:20. The nano particles are selected from nano-scale materials such as mesoporous silica, mesoporous titanium dioxide, metal organic frameworks and the like. The low surface energy small molecule compound is selected from fluorine-containing compounds such as 8-18 carbon perfluorotrimethoxysilane, perfluorinated organic acid, perfluorinated organic amine and the like or fluorine-free compounds such as methyl silicone oil, paraffin, stearic acid, 10-18 carbon organic amine and the like. The mass ratio of the low surface energy small molecular compound to the nano particles is 1:10-1:20.
In the shell layer of the polylactic acid fiber, the open pore structure of the polylactic acid is formed by dispersing water-soluble inorganic salt particles in the shell layer of the polylactic acid fiber and then washing the polylactic acid fiber. The mass ratio of the water-soluble inorganic salt particles to the shell polylactic acid is 1:10-1:20. The water-soluble inorganic salt particles are sodium chloride, calcium chloride or magnesium chloride and the like.
The self-repairing waterproof polylactic acid fiber fabric with the core-shell structure can accelerate the migration speed of low-surface-energy small molecular compounds by controlling the temperature, thereby achieving the purpose of rapidly repairing the hydrophobic property.
The preparation process of the self-repairing waterproof polylactic acid fiber fabric with the core-shell structure comprises the following steps:
(1) taking common polylactic acid materials, putting the materials into an extruder for melt blending, extruding and granulating, wherein the prepared granules are used as raw materials of fiber core materials for standby, and the mass ratio of polylactic acid in a fiber core layer 1, an intermediate layer 3 and a shell layer 4 is 5:3:2;
(2) adding a low-surface-energy small molecular compound into a 98% ethanol water solution, regulating the pH to 3.5 by using acetic acid, stirring for 36 hours, preparing a nanoparticle powder ethanol solution, mixing the hydrolyzed low-surface-energy small molecular compound solution with the solution in a volume ratio of 4:1, stirring for 10 hours, centrifuging, and drying in a vacuum drying oven at 100 ℃ for 8 hours to obtain the surface-modified nanoparticles. Uniformly dispersing the prepared surface-modified nano particles in a polylactic acid matrix by adopting ultrasonic stirring and assisting in mechanical stirring to a certain extent, putting the prepared material into an extruder for melt blending, extruding and granulating, wherein the prepared granules are used as an intermediate layer material for standby, the mass ratio of the nano particles to the intermediate layer polylactic acid is 1:10-1:20, and the mass ratio of the low surface energy small molecular compound to the nano particles is 1:10-1:20.
(3) Drying a pore-forming agent (namely water-soluble inorganic salt particles) and polylactic acid in a drying oven at 50 ℃ for 10 hours, ball-milling the dried pore-forming agent for 5 hours, screening particles with the particle size range of less than 60 mu m by a 200mesh standard sieve, uniformly mixing the pore-forming agent and the polylactic acid according to the mass ratio of 1:10-1:20, premixing by an internal mixer, and then placing in a continuous mixer for mixing and melting, wherein the rotating speed is set to 500r/min, and the temperature is set to 120 ℃; soaking the prepared mixture in distilled water for 48h, changing water every 10h to fully dissolve the pore-forming agent, taking out the sample, and drying at low temperature in a drying oven at 45 ℃ to obtain the porous material serving as an outer shell layer material for standby.
(4) And (3) adopting coaxial melt spinning equipment, putting the core layer material prepared in the step (1), the intermediate layer material prepared in the step (2) and the shell layer material prepared in the step (3) into the equipment, and then carrying out coaxial melt spinning, wherein the mass ratio of the core layer to the intermediate layer to the shell layer is 1:1-1:3:5, the spinning voltage is set to be 18kV, the spinning distance is 5cm, and the fiber diameter is 30-120 mu m. The prepared polylactic acid fiber interweaves to form a fabric, so that the self-repairing polylactic acid fiber fabric with good durability is successfully prepared.
The self-repairing waterproof polylactic acid fiber fabric with the core-shell structure has the advantages that:
1. the waterproof polylactic acid fiber adopts environment-friendly raw materials, the raw materials are easy to obtain and harmless to human bodies, and the functional fiber with waterproof property after use can be biodegraded or recycled, so that the whole process of production, use and recycling is environment-friendly;
2. the fiber core material adopts the hydrophobic compound, has excellent waterproof effect compared with common polylactic acid fiber, and solves the problem that the prior polylactic acid fiber does not have waterproof property;
3. the waterproof polylactic acid fiber provided by the invention also has a certain spontaneous repair function. The self-repairing property is introduced into the super-hydrophobic material, so that the self-repairing material has a better application prospect.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the following description will be given for simplicity of the drawing.
Fig. 1 is a schematic structural view of a self-repairing waterproof polylactic acid fiber fabric with a core-shell structure according to the present invention. Wherein, 1 polylactic acid core layer, 2 nano particles, low surface energy small molecular substance, 3 middle layer, 4 outer layer and 5 pore-forming agent/micropore.
Detailed Description
In order to make the technical scheme and advantages of the present invention more clear, the technical scheme of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. Based on the described embodiments of the invention, other embodiments, which can be obtained by a person skilled in the art without creating work, are within the scope of the invention.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the terms "comprising," "including," or the like in this disclosure is intended to cover a material that appears before the term as well as equivalents thereof, as recited after the term.
The invention will be further described with reference to the drawings and examples.
The embodiment of the invention provides a self-repairing waterproof polylactic acid fiber fabric with a core-shell structure, which is a fiber fabric with polylactic acid bio-based polymer as a matrix material. The related fabric is formed by interweaving polylactic acid fibers; the cross section of the polylactic acid fiber is in a core-shell structure, and the fiber comprises a core layer 1, an intermediate layer 3 and a shell layer 4; the core layer 1 is composed of common polylactic acid, and provides basic mechanical strength for fibers and fabrics; the middle layer 3 is composed of polylactic acid containing nano particles 2, wherein the nano particles 2 contain low-surface energy small molecular compounds to provide hydrophobicity for fibers and fabrics; the shell layer 4 is formed by polylactic acid, has an open pore structure, provides a migration channel of a low surface energy compound, and plays a role in self-repairing the hydrophobic property.
The nano particles 2 in the intermediate layer can be nano-scale materials such as mesoporous silica, mesoporous titania, metal organic frameworks and the like. The mass ratio of the nano particles to the middle layer polylactic acid is 1:10-1:20. The above nanoparticles 2 are not limited to the above-listed types, and are specifically selected according to actual needs.
The low surface energy small molecular compound in the nano particles 2 can be selected from fluorine-containing compounds such as perfluorotrimethoxysilane with 8-18 carbon atoms, perfluorinated organic acid, perfluorinated organic amine and the like or fluorine-free compounds such as methyl silicone oil, paraffin, stearic acid, 10-18 carbon organic amine and the like. The mass ratio of the low surface energy small molecular compound to the nano particles is 1:10-1:20. The above low surface energy small molecule compound is not limited to the above list, and is not particularly limited as long as it can exhibit hydrophobic properties.
The pore-forming agent 5 can be water-soluble inorganic salt particles such as sodium chloride, calcium chloride or magnesium chloride. The mass ratio of the water-soluble inorganic salt particles to the shell polylactic acid is 1:10-1:20. The pore-forming agent 5 is not limited to the above-listed types, and is specifically selected according to actual needs.
The preparation process of the self-repairing waterproof polylactic acid fiber fabric with the core-shell structure comprises the following steps:
(1) taking common polylactic acid materials, putting the materials into an extruder for melt blending, extruding and granulating, wherein the prepared granules are used as raw materials of fiber core materials for standby, and the mass ratio of polylactic acid in a fiber core layer 1, an intermediate layer 3 and a shell layer 4 is 5:3:2;
(2) adding a low-surface-energy small molecular compound into a 98% ethanol water solution, regulating the pH to 3.5 by using acetic acid, stirring for 36 hours, preparing a nanoparticle powder ethanol solution, mixing the hydrolyzed low-surface-energy small molecular compound solution with the solution in a volume ratio of 4:1, stirring for 10 hours, centrifuging, and drying in a vacuum drying oven at 100 ℃ for 8 hours to obtain the surface-modified nanoparticles. Uniformly dispersing the prepared surface-modified nano particles in a polylactic acid matrix by adopting ultrasonic stirring and assisting in mechanical stirring to a certain extent, putting the prepared material into an extruder for melt blending, extruding and granulating, wherein the prepared granules are used as an intermediate layer material for standby, the mass ratio of the nano particles to the intermediate layer polylactic acid is 1:10-1:20, and the mass ratio of the low surface energy small molecular compound to the nano particles is 1:10-1:20.
(3) Drying a pore-foaming agent and polylactic acid in a drying oven at 50 ℃ for 10 hours, ball-milling the dried pore-foaming agent for 5 hours, screening particles with the particle size range of less than 60 mu m by a 200mesh standard sieve, uniformly mixing the pore-foaming agent and the polylactic acid according to the mass ratio of 1:10-1:20, premixing by an internal mixer, and then placing in a continuous mixer for mixing and melting, wherein the rotating speed is set to 500r/min, and the temperature is set to 120 ℃; soaking the prepared mixture in distilled water for 48h, changing water every 10h to fully dissolve the pore-forming agent, taking out the sample, and drying at low temperature in a drying oven at 45 ℃ to obtain the porous material serving as an outer shell layer material for standby.
(4) And (3) adopting coaxial melt spinning equipment, putting the core layer material prepared in the step (1), the intermediate layer material prepared in the step (2) and the shell layer material prepared in the step (3) into the equipment, and then carrying out coaxial melt spinning, wherein the mass ratio of the core layer to the intermediate layer to the shell layer is 1:1-1:3:5, the spinning voltage is set to be 18kV, the spinning distance is 5cm, and the fiber diameter is 30-120 mu m. The prepared polylactic acid fiber interweaves to form a fabric, so that the self-repairing polylactic acid fiber fabric with good durability is successfully prepared.
The composition, preparation and the like of the self-repairing waterproof polylactic acid fiber fabric with the core-shell structure are described below by specific examples. Calculated in parts by weight.
Example 1:
taking 100 parts of common polylactic acid, placing the polylactic acid into an extruder for melt blending, extruding and granulating, and taking the prepared granules as a raw material of a fiber core material for standby.
Adding 0.5 part of perfluorooctyl trimethoxy silane into 98% ethanol water solution, regulating the pH to 3.5 with acetic acid, stirring for 36h, preparing 5 parts of mesoporous silica nanoparticle powder ethanol solution, mixing the hydrolyzed perfluorooctyl trimethoxy silane solution with the hydrolyzed perfluorooctyl trimethoxy silane solution according to the volume ratio of 4:1, stirring for 10h, centrifuging, and drying in a vacuum drying oven at 100 ℃ for 8h to obtain the surface modified nanoparticles. Uniformly dispersing the prepared nano particles 2 containing perfluorooctyl trimethoxy silane in 60 parts of polylactic acid matrix by adopting ultrasonic stirring and assisting a certain degree of mechanical stirring, putting the prepared material into an extruder for melt blending, extruding and granulating, wherein the prepared granules are used as an intermediate layer material for standby.
2 parts of sodium chloride particles and 40 parts of polylactic acid are placed in a drying oven at 50 ℃ for drying for 10 hours, the dried sodium chloride particles are ball-milled for 5 hours, particles with the particle size range below 60 mu m are screened by a 200mesh standard sieve, the sodium chloride particles and the polylactic acid are uniformly mixed, premixed by an internal mixer, placed in a continuous mixer for mixing and melting, the rotating speed is set to 500r/min, and the temperature is set to 120 ℃. The prepared mixture is soaked in distilled water for 48 hours, water is changed every 10 hours, so that sodium chloride particles are fully dissolved, a sample is taken out, and the sample is placed in a drying oven at 45 ℃ for low-temperature drying, so that a porous material can be prepared and used as an outer shell layer material for standby.
Respectively adding 100g of core material raw material, 200g of middle layer raw material and 300g of shell layer raw material into equipment, namely, setting the mass ratio of the core layer to the middle layer to the shell layer to be 1:2:3, setting the spinning voltage to be 18kV, and the spinning distance to be 5cm, and preparing the polylactic acid fiber with a 'core-shell' structure by a coaxial melt spinning method, wherein the fiber diameter is 60 mu m; and interweaving the prepared polylactic acid fibers to form a fabric.
Test results: the fabric was tested for water contact angle at 25 deg. with a result of 155.3 deg., reaching the superhydrophobic rating.
Example 2:
the perfluorooctyl trimethoxysilane of example 1 was replaced with silicone oil. The rest of the components and the dosage as well as the experimental operation steps and the conditions are not changed. And interweaving the prepared polylactic acid fibers to form a fabric.
Test results: the fabric was tested for water contact angle at 25 deg. and as a result 159.6 deg., reaching the superhydrophobic rating.
Example 3:
the amount of mesoporous silica nanoparticles in example 1 was reduced to 50% of the original amount. I.e., the amount of mesoporous silica nanoparticles was 2.5 parts. The rest of the components and the dosage as well as the experimental operation steps and the conditions are not changed. And interweaving the prepared polylactic acid fibers to form a fabric.
Test results: the fabric was tested for water contact angle at 25 deg. with a result of 152.5 deg., superhydrophobic rating. But the water resistance was slightly inferior to that of example 1.
Example 4:
the amount of sodium chloride particles in example 1 was enlarged to 50% of the original amount. I.e. the amount of sodium chloride particles is 3 parts. The rest of the components and the dosage as well as the experimental operation and the conditions are not changed. And interweaving the prepared polylactic acid fibers to form a fabric.
Test results: the fabric was tested for water contact angle at 25 deg. and as a result was 157.2 deg., superhydrophobic grade.
Example 5:
after the fiber fabric prepared in example 1 was repeatedly rubbed 200 times under a pressure of 0.5MPa, the rubbed fabric was then heated at 80 ℃ for 30 minutes and again tested.
Test results: (1) first test: the fabric was tested for water contact angle at 25 ℃ and found to be 145.6 ° and not reach superhydrophobic level; (2) second test: the fabric was tested for water contact angle at 25 deg. and as a result was 151.8 deg., achieving a superhydrophobic rating. The results of the two tests show that the polylactic acid fiber fabric has a certain spontaneous repair function.
Comparative example 1:
the common polylactic acid fiber with the full core material is prepared by taking common polylactic acid as a material. The polylactic acid fibers thus prepared are interwoven to form a fabric. A comparative polylactic acid fiber fabric was prepared, and the amount used in this operation was the same as that in example 1.
Test results: the fabric was tested for water contact angle at 25 deg. and as a result 46 deg., the superhydrophobic rating was not achieved.
Comparative example 2:
the mass ratio of polylactic acid in the fiber core layer, the middle layer and the shell layer in the embodiment 1 is reset to 4-6:3:2, namely, the polylactic acid content in the core layer is 80-120 parts, the polylactic acid content in the middle layer is 60 parts, and the polylactic acid content in the shell layer is 40 parts. The rest of the components and the dosage as well as the experimental operation and the conditions are not changed. And interweaving the prepared polylactic acid fibers to form a fabric.
Test results: the fabric is tested for water contact angle at 25 ℃, and the test results show that when the mass ratio of polylactic acid in the fiber core layer, the middle layer and the shell layer is set to be 5:3:2, the waterproof effect is good.
From the test results of comparative example 1 and comparative example 1, it is understood that the prepared self-repairing waterproof polylactic acid fiber fabric having a core-shell structure has waterproof property. According to the test result of the embodiment 4, the polylactic acid fiber has a certain spontaneous repair function at a certain temperature.
From the above, the self-repairing waterproof polylactic acid fiber fabric with the core-shell structure comprises a core layer, an intermediate layer and a shell layer according to the structure in the figure; the core layer is composed of common polylactic acid, and provides basic mechanical strength for the fiber and the fabric; the middle layer is composed of polylactic acid containing nano particles, wherein the nano particles contain low-surface-energy small molecular compounds to provide hydrophobicity for fibers and fabrics; the shell layer is formed by polylactic acid, has an open pore structure, provides a migration channel of a low-surface-energy compound, and plays a role in self-repairing the hydrophobic property. The prepared polylactic acid fibers are interwoven to form a fabric. The prepared polylactic acid fiber fabric has excellent waterproof effect and has the function of spontaneously repairing waterproof performance.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The self-repairing waterproof polylactic acid fiber fabric with the core-shell structure is characterized in that:
the self-repairing waterproof polylactic acid fiber fabric with the core-shell structure is formed by interweaving polylactic acid fibers; the polylactic acid fiber has a core-shell structure, and specifically comprises a core layer, a middle layer and a shell layer, wherein the core layer is polylactic acid, and provides basic mechanical strength for the fiber and the fabric; the middle layer is composed of polylactic acid containing nano particles, wherein the nano particles contain low-surface-energy small molecular compounds to provide hydrophobicity for fibers and fabrics; the shell layer is formed by polylactic acid, has an open pore structure, provides a migration channel of a low-surface-energy compound, and plays a role in self-repairing the hydrophobic property;
the nano particles are selected from mesoporous silica, mesoporous titanium dioxide and metal organic framework nano-scale materials;
the low surface energy small molecule compound is selected from 8-18 carbon perfluorotrimethoxysilane, perfluoro organic acid, perfluoro organic amine, or methyl silicone oil, paraffin, stearic acid, 10-18 carbon organic amine.
2. The self-repairing waterproof polylactic acid fiber fabric with a core-shell structure according to claim 1, wherein:
the mass ratio of the polylactic acid in the core layer, the middle layer and the shell layer of the polylactic acid fiber is 5:3:2.
3. The self-repairing waterproof polylactic acid fiber fabric with a core-shell structure according to claim 1, wherein:
in the middle layer of the polylactic acid fiber, the mass ratio of the nano particles to the polylactic acid is 1:10-1:20.
4. The self-repairing waterproof polylactic acid fiber fabric with a core-shell structure according to claim 1, wherein:
the mass ratio of the low-surface-energy small molecular compound to the nano particles is 1:10-1:20.
5. The self-repairing waterproof polylactic acid fiber fabric with a core-shell structure according to claim 1, wherein:
in the shell layer of the polylactic acid fiber, the open pore structure of the polylactic acid is formed by dispersing water-soluble inorganic salt particles in the shell layer of the polylactic acid fiber and then washing the polylactic acid fiber.
6. The self-repairing waterproof polylactic acid fiber fabric with a core-shell structure according to claim 5, wherein:
the water-soluble inorganic salt particles are sodium chloride, calcium chloride or magnesium chloride.
7. The self-repairing waterproof polylactic acid fiber fabric with a core-shell structure according to claim 6, wherein:
the mass ratio of the water-soluble inorganic salt particles to the shell polylactic acid is 1:10-1:20.
8. The self-repairing waterproof polylactic acid fiber fabric with a core-shell structure according to claim 1, wherein:
the diameter of the polylactic acid fiber is 30-120 mu m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210291500.XA CN114753022B (en) | 2022-03-23 | 2022-03-23 | Self-repairing waterproof polylactic acid fiber fabric with core-shell structure |
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| CN202210291500.XA CN114753022B (en) | 2022-03-23 | 2022-03-23 | Self-repairing waterproof polylactic acid fiber fabric with core-shell structure |
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| CN114753022A CN114753022A (en) | 2022-07-15 |
| CN114753022B true CN114753022B (en) | 2023-06-27 |
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| CN114032627A (en) * | 2021-12-16 | 2022-02-11 | 李永梅 | Negative ion moisture absorption health care functional fiber with skin-core structure and preparation method thereof |
| CN114086304A (en) * | 2021-11-29 | 2022-02-25 | 香港纺织及成衣研发中心有限公司 | Moisture-absorbing and sweat-releasing polylactic acid multilayer knitted fabric and preparation method thereof |
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| US8518320B2 (en) * | 2009-05-21 | 2013-08-27 | University Of Cincinnati | Methods for electrospinning hydrophobic coaxial fibers into superhydrophobic and oleophobic coaxial fiber mats |
| US20150056471A1 (en) * | 2012-02-16 | 2015-02-26 | Cornell University | Ordered porous nanofibers, methods, and applications |
| CN103449736B (en) * | 2012-05-28 | 2015-11-18 | 中国科学院兰州化学物理研究所 | The preparation method of self-repairing super hydrophobic polyurethane coating |
| CN105038439B (en) * | 2015-08-18 | 2017-07-28 | 东北石油大学 | A kind of super hydrophobic composite coating with self-repair function and preparation method thereof |
| CN105641744B (en) * | 2016-02-27 | 2018-10-26 | 青岛大学 | One kind receives multiple dimensioned chitosan polylactic acid compound rest of micron and preparation method thereof |
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| CN114032627A (en) * | 2021-12-16 | 2022-02-11 | 李永梅 | Negative ion moisture absorption health care functional fiber with skin-core structure and preparation method thereof |
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