CN111321593A - Natural sterilization and deodorization fiber and preparation method thereof - Google Patents
Natural sterilization and deodorization fiber and preparation method thereof Download PDFInfo
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- CN111321593A CN111321593A CN201811529030.6A CN201811529030A CN111321593A CN 111321593 A CN111321593 A CN 111321593A CN 201811529030 A CN201811529030 A CN 201811529030A CN 111321593 A CN111321593 A CN 111321593A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives thereof
- D06M15/03—Polysaccharides or derivatives thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/184—Carboxylic acids; Anhydrides, halides or salts thereof
- D06M13/188—Monocarboxylic acids; Anhydrides, halides or salts thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
- D06M13/184—Carboxylic acids; Anhydrides, halides or salts thereof
- D06M13/207—Substituted carboxylic acids, e.g. by hydroxy or keto groups; Anhydrides, halides or salts thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives thereof
- D06M15/15—Proteins or derivatives thereof
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M16/00—Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/26—Polymers or copolymers of unsaturated carboxylic acids or derivatives thereof
- D06M2101/28—Acrylonitrile; Methacrylonitrile
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/34—Polyamides
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- Textile Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Microbiology (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention provides a natural sterilizing and deodorizing fiber with excellent performance, and the preparation method comprises the following steps: (1) dispersing and dissolving chitosan in water added with organic acid composite solution, and then sequentially adding sericin and gelatin to obtain mixed aqueous solution; (2) the natural sterilizing and deodorizing fiber is obtained after the fiber is treated by the mixed aqueous solution by the conventional padding or spraying method and is dried and thermally treated. The functional fiber prepared by the method has the advantages of excellent antimicrobial property, high safety, good washing durability and skin-friendly and soft property.
Description
Technical Field
The invention relates to a natural sterilization and deodorization fiber and a preparation method thereof, belonging to the field of textile manufacturing.
Background
Fiber products which are in direct contact with the skin such as underwear, gloves, socks, shirts, bedclothes, carpets and the like are often attached by skin secretions such as sweat and the like during use, and the skin secretions can become a nutrient source for the reproduction of various bacteria and fungi, cause numerous diseases and endanger the physical health of people. For this urgent problem, the mainstream approach is to add various synthetic antibacterial agents, such as various antimicrobial metal ions (silver, copper, zinc) based on organosilicon quaternary ammonium salt, to the fiber and fiber cloth products to impart antibacterial property. However, the antibacterial fabric obtained by the method is not always safe for human bodies, and a part of antibacterial agents can cause adverse reactions such as skin rash and the like in application, and particularly, the antibacterial fabric is obvious for people with sensitive skin such as newborns and the like. And some antibacterial agents can generate toxic substances such as dioxin and the like during incineration, thereby polluting the environment.
Chitosan (chitosan), a natural antibacterial and deodorizing substance, is obtained by deacetylating chitin widely existing in the nature, and has recently been widely used in various fields such as medicine, food, cosmetics, biomedical engineering, etc., as an antimicrobial component. Chinese patent application No. 200710053709.8 discloses a chitosan/starch blending drug-loaded fiber with excellent mechanical properties and a preparation method thereof. Chinese patent application No. 201310202585.0 discloses a chitosan-ethyl cellulose blending film, a blending gel and a preparation method thereof. The chitosan is used as an antibacterial component to prepare a novel natural antibacterial composite material which is applied to the fields of women, infants and medical supplies with high requirements on human safety. However, the fiber product which is in direct contact with the skin in daily life only applies the antibacterial property of chitosan, not only has antibacterial and deodorizing capacity and safety to human bodies, but also needs to consider wearing comfort and washing durability, particularly the adhesive used for ensuring the washing durability, and also needs to consider the safety to human bodies, so that sericin and gelatin which have natural adhesion and protection functions are adopted as the adhesive, and the requirements are met at the same time.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a functional fiber with excellent performance and a preparation method thereof, and the fiber has the functions of antibiosis and deodorization, is comfortable to wear, safe to human bodies, natural and free of pollution, and has good washing durability. Can be used for various fiber products which can directly contact with the skin in daily life, such as underwear, gloves, socks, shirts, bedding, carpets, women and infants, medical supplies, and the like.
The preparation method of the natural sterilizing and deodorizing fiber provided by the invention comprises the following steps.
(1) Dispersing chitosan in water at a certain temperature, adding the organic acid complex solution while stirring the dispersion to adjust the pH value of the solution, sequentially adding sericin and gelatin after the chitosan is completely dissolved, continuously stirring for a period of time, and uniformly mixing to obtain a mixed aqueous solution A.
(2) The fiber is treated by the mixed aqueous solution A through a conventional padding or spraying method, and a method of two-padding and two-rolling can be adopted when the requirement on the washing durability of the fiber is higher. And then, drying and heat-treating the treated fiber for a period of time under a certain temperature condition by using a hot air dryer to obtain the functional fiber with excellent antimicrobial property, high safety and good washing durability.
The chitosan has a deacetylation degree of more than 55%, a molecular weight of 20-140k daltons, preferably a deacetylation degree of 65-92% and a molecular weight of 60-120 k daltons, and is more easily dissolved and has a better bacteriostatic effect when the deacetylation degree is 92% and the molecular weight is 100k daltons; the addition amount of the chitosan is 0.1-2% of the mass percentage concentration, preferably 2%, the antibacterial performance effect is poor when the concentration is too low, even the requirement cannot be met, the concentration exceeds 2%, and the antibacterial performance is not obviously improved when the addition amount of the chitosan is continuously increased, but the cost is increased.
The organic acid compound solution is a compound solution of acetic acid, citric acid and tartaric acid, the molar ratio of the acetic acid to the citric acid to the tartaric acid is 3:1:1, the acetic acid with the weakest acidity is selected to be the most suitable, a single acetic acid solution is milder in reaction process, but the organic acid compound with the citric acid and the tartaric acid has better solubility and improved antibacterial property, so a large number of experiments are carried out in the compound process of the citric acid and the tartaric acid, and the ratio with the best comprehensive property is finally balanced.
Wherein the mass ratio of the sericin to the chitosan in the step (1) is (0.1-2): 1, preferably 1.8:1, the specific addition amount depends on the deacetylation degree and the molecular weight of the chitosan, the higher the deacetylation degree of the chitosan, the lower the molecular weight, the more the addition amount of the sericin needs to be increased to ensure the bonding fastness, and when the addition amount of the sericin is 2 times of the addition amount of the chitosan, the washing durability of the functional fiber continuously increasing the addition amount of the sericin does not change obviously.
Wherein, the mass ratio of the added amount of the gelatin in the step (1) to the sericin is (0-0.8): 1, preferably 0.5:1, and the added amount is more favorable for the durability of fiber washing.
The fibers in the step (2) mainly refer to synthetic fibers (including polyamide, polyester, polyacrylonitrile and the like) and semi-synthetic fibers obtained by blending synthetic fibers, cellulose fibers and animal fibers. After padding or spraying treatment, the total adhesion amount of chitosan, sericin and gelatin on the surface of the fiber is between 0.05 and 0.5 percent, preferably between 0.15 and 0.35 percent, and at the moment, the antibacterial property of the fiber can be ensured, and the luster and the hand feeling of the fiber fabric cannot be influenced because of overhigh adhesion amount.
Wherein the temperature in the step (1) is 60-70 ℃, preferably 60 ℃, and the water temperature is favorable for dissolving the acidified chitosan.
Wherein, the stirring speed in the step (1) is controlled at 500r/min, specifically at 200r/min, the stirring speed is lower than 100r/min, the dispersion of chitosan is not good, the dissolution is slow, the burden of stirring equipment is too high, and the dispersion liquid is easy to splash around.
Wherein, the pH value in the step (1) is adjusted to 3-4, and the chitosan dissolution effect is the best at the pH value.
Wherein, the temperature in the step (2) is 100-; the higher the temperature, the shorter the time required for the drying heat treatment, the higher the productivity and the lower the relative energy consumption, but it should be noted that the high temperature will have a bad influence on the physical properties of some kinds of synthetic fibers, and the fiber with excellent antimicrobial property, high safety and good washing durability can be obtained by selecting 100 ℃ plus 120 ℃ in the allowable production capacity.
The invention further provides the natural sterilization and deodorization fiber prepared by the method, the product performance is excellent, the fiber is safe and environment-friendly, and the fiber can be used for producing underwear, gloves, socks, shirts, bedding articles, carpets, women and infants articles, medical articles and the like.
Compared with the prior art, the invention has the beneficial effects that.
(1) The concentration of the chitosan is 0.1-2%, preferably 2%, the antibacterial performance effect is poor when the concentration is too low, even the antibacterial requirement cannot be met, the concentration exceeds 2%, the antibacterial performance is not obviously improved when the addition amount of the chitosan is continuously increased, and the cost is increased.
(2) The pH value is adjusted by the organic acid compound liquid compounded by the acetic acid, the citric acid and the tartaric acid, the acetic acid with the weakest acidity is selected to be most suitable in consideration of the influence of the organic acid on the fiber strength, and although the reaction process of a single acetic acid solution is milder, the organic acid compound liquid compounded by the citric acid and the tartaric acid has better solubility and improved antibacterial property, so a large number of experiments are carried out in the compounding process of the three, and the ratio with the best comprehensive property is finally balanced.
(3) The combined use of sericin and gelatin ensures the bonding fastness, and when the addition of sericin is 2 times of that of chitosan, the washing durability of the functional fiber with the addition of sericin is continuously increased without obvious change; when the mass ratio of the added amount of the gelatin to the sericin is 0.5:1, the added amount is more beneficial to the durability and the body feeling comfort degree of fiber washing.
(4) The functional fiber prepared by the method has the advantages of excellent antimicrobial property, high safety, good washing durability and skin-friendly and soft property.
Detailed Description
The preparation and treatment methods used in the following examples are conventional methods unless otherwise specified.
The starting materials used in the following examples are commercially available unless otherwise specified.
The method for measuring the antibacterial performance in the following examples adopts the national standard 'evaluation of textile antibacterial performance part 3 oscillation method' (GBT 20944.3-2008), the strain is staphylococcus aureus (ATCC 6538), and the number of times of transferring the strain does not exceed 10 generations.
Example 1 natural bactericidal deodorant nylon 66 fiber.
(1) Dispersing 2g of chitosan in 100g of water at 60 ℃, then adding the organic acid complex solution while stirring the dispersion solution, adjusting the pH value of the solution to 3, adding 3g of sericin and 2.4g of gelatin in sequence after the chitosan is completely dissolved, and continuously stirring for 2 hours to obtain a mixed aqueous solution A.
(2) And (2) padding nylon 66 fibers by using the mixed aqueous solution A, performing two-step padding and two-step soaking in a treatment process, wherein the adhesion amount of glycan, sericin and gelatin on the surfaces of the soaked nylon 66 is about 0.35%, and then drying the treated nylon 66 fibers for 40s by using a hot air dryer at the temperature of 130-140 ℃ to obtain the natural sterilizing and deodorizing nylon 66 fibers.
Wherein the organic acid compound solution is a compound solution of acetic acid, citric acid and tartaric acid, and the molar ratio of the three is as follows: 3:1:1.
The antibacterial rate of the sterilization and deodorization nylon 66 fiber prepared by the embodiment is 94.73%, and the fiber has skin-friendly and soft hand feeling.
Example 2 Natural sterilizing deodorizing acrylic fiber.
⑴ dispersing 1.5g of chitosan in 100g of water at 60 ℃, then adding organic complex acid while stirring the dispersion, adjusting the pH value of the solution to 3, adding 3g of sericin and 1.8g of gelatin in turn after the chitosan is completely dissolved, and continuously stirring for 2h to obtain a mixed aqueous solution of chitosan, sericin and gelatin.
⑵ spraying the mixed aqueous solution of chitosan, sericin and gelatin on the acrylic fiber, wherein the adhesion of chitosan, sericin and gelatin on the surface of the acrylic fiber after spraying treatment is about 0.2%, and drying the treated acrylic fiber for 1min at the temperature of 120 plus 130 ℃ by using a hot air dryer to obtain the natural sterilizing and deodorizing acrylic fiber.
Wherein the organic acid compound solution is a compound solution of acetic acid, citric acid and tartaric acid, and the molar ratio of the three is as follows: 3:1:1
The antibacterial rate of the bactericidal deodorant acrylic fiber prepared by the embodiment is 90.15%, and the fiber has skin-friendly and soft hand feeling.
Example 3 Natural sterilizing and deodorizing Nylon 6 fiber.
⑴ dispersing 0.5g chitosan in 100g water at 70 deg.C, adding organic complex acid while stirring the dispersion to adjust the pH value to 4, adding 0.5g sericin and 0.4g gelatin after chitosan is completely dissolved, and stirring for 1 hr to obtain mixed aqueous solution of chitosan, sericin and gelatin.
⑵ the nylon 66 fiber is processed by padding with the mixed aqueous solution of chitosan, sericin and gelatin, the processing technique is one padding and one rolling, the adhesion of the chitosan, sericin and gelatin on the surface of the nylon 66 after the padding is about 0.3 percent, and then the processed nylon 66 fiber is dried for 3 minutes by a hot air drier at the temperature of 100 ℃ to obtain the natural sterilizing and deodorizing nylon 66 fiber.
Wherein the organic acid compound solution is a compound solution of acetic acid, citric acid and tartaric acid, and the molar ratio of the three is as follows: 3:1:1.
The antibacterial rate of the sterilization and deodorization nylon 66 fiber prepared by the embodiment is 84.66%, and the fiber has skin-friendly and soft hand feeling.
Claims (10)
1. A natural sterilizing and deodorizing fiber is prepared by the following steps:
(1) dispersing chitosan in water at a certain temperature, adding an organic acid complex solution while stirring the dispersion to adjust the pH value of the solution, sequentially adding sericin and gelatin after the chitosan is completely dissolved, continuously stirring for a period of time, and uniformly mixing to obtain a mixed aqueous solution A;
(2) the fiber is treated by the mixed aqueous solution A through a conventional padding or spraying method, a double-padding and double-rolling method can be adopted when the requirement on the washing durability of the fiber is high, and then a hot air dryer is used for carrying out drying heat treatment on the treated fiber for a period of time under a certain temperature condition, so that the functional fiber with excellent antimicrobial property, high safety and good washing durability is obtained.
2. The process according to claim 1, wherein the chitosan has a degree of deacetylation of 55% or more, a molecular weight of 20-140 kdaltons, preferably a degree of deacetylation of 65-92%, a molecular weight of 60-120 kdaltons; the addition amount of chitosan is 0.1-2% of mass percentage concentration, and the preferred amount is 2%.
3. The preparation method of claim 1, wherein the organic acid complex liquid is a complex liquid of acetic acid, citric acid and tartaric acid, and the molar ratio of the three is 3:1: 1.
4. The method according to claim 1, wherein the mass ratio of sericin to chitosan in the step (1) is (0.1-2: 1, preferably 1.8: 1.
5. The process according to claim 1, wherein the gelatin is added in the step (1) in a mass ratio of (0-0.8): 1, preferably 0.5:1, to sericin.
6. The preparation method according to claim 1, wherein the fiber in step (2) mainly refers to synthetic fiber (including polyamide, polyester, polyacrylonitrile, etc.) and semisynthetic fiber obtained by blending synthetic fiber with cellulose fiber and animal fiber; after padding or spraying, the total adhesion of chitosan, sericin and gelatin on the surface of the fiber is between 0.05 and 0.5 percent, preferably between 0.15 and 0.35 percent.
7. The method according to claim 1, wherein the temperature in step (1) is 60 to 70 ℃, preferably 60 ℃.
8. The method as claimed in claim 1, wherein the stirring speed in step (1) is controlled to be 100-500r/min, specifically 200 r/min.
9. The method according to claim 1, wherein the pH in the step (1) is adjusted to 3 to 4.
10. The preparation method according to claim 1, wherein the temperature in step (2) is 100-.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811529030.6A CN111321593A (en) | 2018-12-14 | 2018-12-14 | Natural sterilization and deodorization fiber and preparation method thereof |
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| CN201811529030.6A CN111321593A (en) | 2018-12-14 | 2018-12-14 | Natural sterilization and deodorization fiber and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112981951A (en) * | 2021-03-01 | 2021-06-18 | 上海正家牛奶丝科技有限公司 | Instant deodorizing fiber and preparation method thereof |
| CN113322672A (en) * | 2021-05-31 | 2021-08-31 | 常熟市宇特纺织品有限公司 | Moisture-absorbing, deodorizing and antibacterial polyester knitted fabric and preparation process thereof |
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| JP2003239174A (en) * | 2003-02-07 | 2003-08-27 | Seiren Co Ltd | Functional fiber product |
| CN101324029A (en) * | 2008-07-24 | 2008-12-17 | 浙江理工大学 | A kind of antibacterial and hydrophilic nonwoven fabric and its preparation method and application |
| CN101377059A (en) * | 2007-08-30 | 2009-03-04 | 东丽纤维研究所（中国）有限公司 | Durability natural object machining textile |
| CN104294595A (en) * | 2014-09-10 | 2015-01-21 | 江苏双双布业有限公司 | Production process for anti-bacterial deodorant textile |
| CN105544210A (en) * | 2016-01-21 | 2016-05-04 | 苏州印丝特纺织数码科技有限公司 | Fabric post-finishing agent based on modified silk fibroin solution and preparation method of fabric post-finishing agent |
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2018
- 2018-12-14 CN CN201811529030.6A patent/CN111321593A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003239174A (en) * | 2003-02-07 | 2003-08-27 | Seiren Co Ltd | Functional fiber product |
| CN101377059A (en) * | 2007-08-30 | 2009-03-04 | 东丽纤维研究所（中国）有限公司 | Durability natural object machining textile |
| CN101324029A (en) * | 2008-07-24 | 2008-12-17 | 浙江理工大学 | A kind of antibacterial and hydrophilic nonwoven fabric and its preparation method and application |
| CN104294595A (en) * | 2014-09-10 | 2015-01-21 | 江苏双双布业有限公司 | Production process for anti-bacterial deodorant textile |
| CN105544210A (en) * | 2016-01-21 | 2016-05-04 | 苏州印丝特纺织数码科技有限公司 | Fabric post-finishing agent based on modified silk fibroin solution and preparation method of fabric post-finishing agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112981951A (en) * | 2021-03-01 | 2021-06-18 | 上海正家牛奶丝科技有限公司 | Instant deodorizing fiber and preparation method thereof |
| CN112981951B (en) * | 2021-03-01 | 2022-12-16 | 上海正家牛奶丝科技有限公司 | Instant deodorizing fiber and preparation method thereof |
| CN113322672A (en) * | 2021-05-31 | 2021-08-31 | 常熟市宇特纺织品有限公司 | Moisture-absorbing, deodorizing and antibacterial polyester knitted fabric and preparation process thereof |
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Application publication date: 20200623 |