CN113106615B - Anti-poison knitted fabric and production method thereof - Google Patents

Anti-poison knitted fabric and production method thereof Download PDF

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Publication number
CN113106615B
CN113106615B CN202110389208.7A CN202110389208A CN113106615B CN 113106615 B CN113106615 B CN 113106615B CN 202110389208 A CN202110389208 A CN 202110389208A CN 113106615 B CN113106615 B CN 113106615B
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carbon
doped
yarn
knitted fabric
yarns
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CN113106615A (en
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王灵杰
李秀明
霍晓兵
张兰
杨洋
常小琦
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Beijing Bangwei High Tech New Material Technology Co ltd
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Beijing Bw Hi Tech Special Textile Co ltd
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    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04BKNITTING
    • D04B1/00Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/14Other fabrics or articles characterised primarily by the use of particular thread materials
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04BKNITTING
    • D04B1/00Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/14Other fabrics or articles characterised primarily by the use of particular thread materials
    • D04B1/16Other fabrics or articles characterised primarily by the use of particular thread materials synthetic threads
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04BKNITTING
    • D04B1/00Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/14Other fabrics or articles characterised primarily by the use of particular thread materials
    • D04B1/18Other fabrics or articles characterised primarily by the use of particular thread materials elastic threads
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06CFINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00Heating or cooling textile fabrics
    • D06C7/02Setting
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00Cellulose-based fibres, e.g. vegetable fibres
    • D10B2201/01Natural vegetable fibres
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00Cellulose-based fibres, e.g. vegetable fibres
    • D10B2201/01Natural vegetable fibres
    • D10B2201/02Cotton
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/10Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
    • D10B2321/101Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide modacrylic
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D10B2331/021Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04Fibres 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]
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/10Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyurethanes
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/14Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polycondensates of cyclic compounds, e.g. polyimides, polybenzimidazoles
    • DTEXTILES; PAPER
    • D10INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10BINDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/30Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polycondensation products not covered by indexing codes D10B2331/02 - D10B2331/14

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Of Fabric (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

The invention discloses an anti-virus knitted fabric and a production method thereof. The production method of the anti-virus knitted fabric comprises the steps of knitting the carbon-doped yarn and the covering silk into knitted grey cloth; wherein the carbon-doped yarns and the wrapping yarns are woven in a number ratio of 1-2: 1; the tissue structure is flat needle tissue, variable flat needle tissue or rib tissue; the covered yarn is a core-spun yarn which is spun by covering spandex filament with other chemical fiber filaments except spandex; the carbon-doped yarn is a single yarn prepared from modacrylic carbon-doped fiber and optional other fibers. The invention can form the anti-virus knitted fabric with better anti-virus performance, air permeability and higher bursting strength value by using the carbon-doped yarns with lower strength.

Description

Anti-poison knitted fabric and production method thereof
Technical Field
The invention relates to an anti-virus knitted fabric and a production method thereof.
Background
The gas suit, the gas gloves and the gas boots are taken as the skin protection equipment of individual protection equipment and are always the key points of the research of all countries in the world. The development of the equipment depends on the improvement of materials, the isolated personal protection equipment is made of rubber materials, and the equipment made of the materials has strong protection performance, is heavy and poor in heat dissipation performance, and is easy to cause larger physiological load to a wearer. The breathable personal protection equipment mainly uses carbon adsorption materials, can permeate air and moisture, adsorbs external toxic gas, droplet-shaped toxicants, bacteria and radioactive dust, and avoids causing harm to human bodies. The physiological comfort of the existing breathable gas defense fabric is still to be improved.
Modacrylic is a fiber spun from an acrylonitrile-vinyl chloride (or vinylidene chloride) copolymer. The carbon-doped modacrylic fiber prepared by blending the modacrylic and the activated carbon has better flame retardance and adsorption performance, but the strength is still to be improved. The carbon-doped yarn spun by the carbon-doped modacrylic fiber has low strength, and the carbon-doped yarn spun by the carbon-doped modacrylic fiber has still not high strength, so that the carbon-doped yarn still has great difficulty in spinning the gas-proof fabric.
CN101181661A discloses a multifunctional breathable protective material and a preparation method thereof. Consists of a multifunctional protective fabric layer, a barrier layer and an adsorption layer. The multifunctional protective fabric layer is prepared by blending and spinning flame-retardant fibers and conductive fibers, weaving, and performing dyeing and printing, oil resistance, water repellency and antibacterial function after-treatment. The flame-retardant fiber is made of one or more of aramid fiber 1313, polysulfonamide, polyphenylene sulfide, modacrylic and the like through pure spinning or blending. CN107584824A discloses a multifunctional breathable gas-proof suit fabric and a preparation method thereof, and the multifunctional breathable gas-proof suit fabric is composed of a multifunctional layer, an adhesive layer, an adsorption layer, an adhesive layer and a comfortable layer. The multifunctional protective fabric layer is prepared by blending and spinning flame-retardant fibers and conductive fibers, weaving, dyeing and printing, and performing water-repellent and oil-proof after-treatment. The flame-retardant fiber is made of one or more of aramid fiber 1313, polysulfonamide, polyphenylene sulfide, modacrylic and the like through pure spinning or blending. Although the above two patent documents refer to modacrylic, the above two patent documents do not relate to modacrylic carbon-doped fiber, carbon-doped yarns containing the modacrylic, and even to the weaving of gas-proof knitted fabrics from the carbon-doped yarns.
CN111733508A discloses an anti-poison fabric and its weaving method. And weaving the yarn containing the carbon-doped acrylic-chlorine fiber to form the gas defense fabric. The patent document weaves the yarn containing the carbon-doped acrylic-vinyl chloride-acrylic fiber into the gas-proof fabric mainly by controlling the speed of a weaving machine and the tension of the weaving machine. Although the gas barrier fabric obtained in this patent document has a high benzene absorption amount and air permeability, the patent document does not deal with the bursting strength of the gas barrier fabric.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for producing an anti-virus knitted fabric, in which a carbon-doped yarn formed from modacrylic carbon-doped fiber with a low tenacity is knitted into the anti-virus knitted fabric, and the anti-virus knitted fabric has a high bursting strength on the basis of having a good anti-virus performance and a good air permeability. Another object of the present invention is to provide a knitted gas barrier fabric having a benzene absorption of not less than 4%, an air permeability of not less than 300mm/s, and a burst strength of not less than 450N.
The invention achieves the above purpose through the following technical scheme.
The invention provides a production method of an anti-poison knitted fabric, which comprises the steps of knitting carbon-doped yarns and covering yarns into knitted grey cloth; wherein the content of the first and second substances,
the carbon-doped yarns and the wrapping yarns are woven in a quantity ratio of 1-2: 1; the tissue structure is flat needle tissue, variable flat needle tissue or rib tissue;
the covered yarn is a core-spun yarn which is spun by covering spandex filament with other chemical fiber filaments except spandex; the carbon-doped yarn is a single yarn prepared from modacrylic carbon-doped fiber and optional other fibers.
According to the production method, the linear density of the carbon-doped yarn is preferably 25.6-49.2 tex.
According to the production method, the linear density of the carbon-doped yarn is preferably 28.1-42.1 tex.
According to the production method of the present invention, preferably, the loom used is an E12 circular knitting machine.
According to the production method of the present invention, preferably, the other chemical fiber filaments are at least one selected from the group consisting of polyester filaments and nylon filaments.
According to the production method provided by the invention, preferably, the linear density of the other chemical fiber filaments is 20-70D, and the linear density of the spandex filaments is 20-50D.
According to the production method of the invention, preferably, the carbon-doped modacrylic fiber is activated carbon-loaded modacrylic; the weight ratio of the modacrylic to the activated carbon is 77-95: 5-23; the carbon-doped yarn is formed by modacrylic carbon-doped fiber and optional other fibers; wherein the other fiber is selected from one of polysulfonamide fiber, polyimide fiber, polyester fiber, aramid fiber, hemp fiber and cotton fiber.
The production method according to the present invention preferably comprises the following specific steps:
(1) weaving: weaving the carbon-doped yarns and the coated yarns into knitted grey cloth; wherein the weaving humidity is 65-75%;
(2) scutching: splitting the woven cylindrical gray fabric along a splitting line to obtain an open-width package knitted gray fabric;
(3) presetting: pre-shaping the grey cloth obtained in the step (2); the presetting temperature is 150-180 ℃, and the vehicle speed is 15-25 m/min;
(4) washing with water: washing the knitted fabric obtained in the step (3) in clear water, and then carrying out dehydration treatment;
(5) shaping: and (5) sizing the knitted fabric obtained in the step (4), wherein the sizing temperature is 150-180 ℃, and the vehicle speed is 15-25 m/min, so that the gas-proof knitted fabric is obtained.
According to the production method provided by the invention, preferably, in the step (3), the presetting temperature is 155-170 ℃, and the vehicle speed is 16-22 m/min;
in the step (4), the temperature of clear water is 45-65 ℃, and the bath ratio is 1: 4-6; washing with clear water for 15-30 min;
in the step (5), the setting temperature is 155-175 ℃, the vehicle speed is 17-23 m/min, the breadth of the obtained anti-virus knitted fabric is 125-145 cm, and the gram weight is 280-320 g/m 2
The invention also provides the anti-virus knitted fabric obtained by the production method, wherein the benzene absorption amount of the anti-virus knitted fabric is not less than 4 percent; the air permeability is not less than 300 mm/s; the bursting strength is not less than 450N.
The production method can weave the carbon-doped yarn formed by the modacrylic carbon-doped fiber with lower strength into the anti-virus knitted fabric, and the anti-virus knitted fabric has higher bursting strength on the basis of having better anti-virus performance and air permeability. According to the preferred technical scheme of the invention, the carbon-doped yarns can be successfully woven into the anti-virus knitted fabric by adopting a specific weave structure and the number ratio of the carbon-doped yarns to the coating yarns, and the anti-virus knitted fabric has good performance, especially has a high bursting strength value. In addition, the obtained gas-proof knitted fabric is softer and has better wearing comfort. The gas-proof knitted fabric can be used as inner layer fabric of gas-proof clothes, gas-proof underwear, gas-permeable gas-proof gloves or gas-permeable gas-proof socks.
Drawings
FIG. 1 is a knitting diagram of a modified plain stitch according to the present invention.
Fig. 2 is a triangular arrangement diagram of fig. 1.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
The production method of the invention can weave the carbon-doped yarn with lower strength and difficult weaving into the gas-proof knitted fabric with better performance.
The production method of the anti-virus knitted fabric comprises the following steps: (1) weaving; (2) scutching; (3) presetting; (4) washing with water; (5) and (6) shaping.
< weaving >
And weaving the carbon-doped yarns and the covering yarns into knitted grey cloth.
In the present invention, the loom used was an E12 circular knitting machine, and the tube diameter of the loom was 34 inches. The invention has surprisingly found that the use of this particular loom is more advantageous in obtaining a gas-repellent knitted fabric.
In the invention, the carbon-doped yarns and the wrapping yarns are woven in a number ratio of 1-2: 1. Preferably, the carbon-doped yarns and the wrapping filaments are woven in a number ratio of 1: 1. Therefore, the anti-virus knitted fabric has better strength on the basis of better anti-virus performance and air permeability.
The weaving humidity is 65-75%, preferably 68-75%, and more preferably 70-75%. The tissue structure is flat needle tissue, modified flat needle tissue or rib tissue, preferably modified flat needle tissue, more preferably modified flat needle tissue and septum tissue. The invention finds that the obtained knitted fabric has excellent anti-toxicity performance, effectively reduces the yarn breakage rate, reduces the surface holes of the knitted fabric and improves the production efficiency.
In the present invention, the covered yarn is a core yarn spun by covering a spandex filament with a chemical fiber filament other than spandex, using the spandex filament as a core yarn. The other chemical fiber filament may be at least one selected from the group consisting of polyester filament and nylon filament. Preferably, the other chemical fiber filaments are polyester filaments or nylon filaments. The linear density of the other chemical fiber filaments is 20-70D, preferably 20-60D, and more preferably 20-50D. The linear density of the spandex filament is 20-50D, preferably 20-40D, and more preferably 20-30D. Thus, the anti-poison knitted fabric is beneficial to taking account of the anti-poison performance, the air permeability and the bursting strength of the anti-poison knitted fabric.
In the invention, the covering yarn is a core-spun yarn spun by spandex filament and chinlon filament, and is called as chinlon covered yarn. The covered yarn is a core-spun yarn spun by spandex filament and polyester filament, and is called polyester-polyurethane covered yarn.
In the invention, the linear density of the carbon-doped yarn is 25.6-49.2 tex, preferably 28.1-42.1 tex, and more preferably 29.5-39.4 tex.
In the present invention, the carbon-doped yarn is a yarn prepared from carbon-doped modacrylic fiber and optionally other fibers. The carbon-doped modacrylic fiber is modacrylic loaded with active carbon; the weight ratio of the modacrylic to the activated carbon is 77-95: 5-23. The linear density of the carbon-doped modacrylic fiber is 2.8-4.2 dtex, the deviation of the linear density is-15- + 15%, the breaking strength is 1-3 cN/dtex, and the elongation at break is 20-45%.
Reference may be made to CN111733502A (carbon-doped yarn and its method of production), which is incorporated herein in its entirety. Modacrylic refers to a fiber spun from an acrylonitrile-vinyl chloride (or vinylidene chloride) copolymer. The weight ratio of the modacrylic to the activated carbon is 77-95: 5-23, preferably 80-95: 5-20, and more preferably 80-90: 10-20. The active carbon is fixed in the modacrylic, so that the fall-off of the modacrylic is avoided. The activated carbon may be ultra-fine activated carbon. In some embodiments, the carbon-doped modacrylic fiber is prepared by taking acrylonitrile-vinyl chloride (or vinylidene chloride) copolymer fiber and activated carbon as raw materials, taking dimethylformamide as a solvent, and adopting a blending spinning process. The activated carbon can be prepared from coconut shell charcoal, high temperature bamboo charcoal and charcoal by charring, activating, grinding and grading.
The linear density of the modacrylic carbon-doped fiber can be 2.8-4.2 dtex, preferably 3.0-4.2 dtex, and more preferably 3.5-4.2 dtex. The linear density deviation may be-15 to + 15%, preferably-12 to + 12%, more preferably-10 to + 10%. The breaking strength can be 1-3 cN/dtex, preferably 1.5-3 cN/dtex, more preferably 2-3 cN/dtex; the elongation at break may be 20 to 45%, preferably 20 to 40%, more preferably 25 to 35%.
The production method of one embodiment of the carbon-doped yarn comprises the following steps:
(1) blowing and carding: carrying out blowing and carding on the carbon-doped modacrylic fiber and optional other fibers to obtain raw slivers; wherein the other fiber is selected from one of polysulfonamide fiber, polyimide fiber, polyester fiber, aramid fiber, hemp fiber and cotton fiber;
(2) preparing strips: manufacturing the raw sliver into yarn strips by using a compression roller and a coiling device, wherein the speed of a front roller is 45-135 r/min;
(3) drawing: feeding the yarn strips into a drawing frame, and performing drawing-drafting-mixing-slivering procedures to obtain drawn slivers, wherein the quantitative amount of the drawn slivers is 2.5-8.5 g/m, and the weight unevenness is not more than 6%;
(4) roving: drafting, twisting and winding the drawn sliver into roving; wherein the drafting multiple is 6-15 times, the speed of a front roller is 90-185 r/min, the twist is 16-29 twist/m, and the speed of a spindle is 170-270 r/min; the quantitative dry weight of the rough yarn is 2-7 g/10 m;
(5) spinning: drafting, twisting and winding the rough yarn to obtain spun yarn, wherein the twist is 535-575 twists/m, the drafting multiple is 12-22 times, the speed of a front roller is 70-150 r/min, and the speed of a spindle is 5800-6900 r/min; the quantitative dry weight of the spun yarn is 1.5-4.6 g/50 m;
(6) spooling: and processing the spun yarn into a bobbin meeting certain requirements on a bobbin winder to obtain the carbon-doped yarn.
The carbon-doped yarn is a single yarn. The linear density of the carbon-doped yarn (single yarn) is 25.6-49.2 tex, the deviation of the linear density is-5 to +5 percent, the breaking strength of the carbon-doped yarn is not less than 5cN/tex, the CV value of the breaking strength is not more than 25 percent, and the benzene absorption amount is not less than 4.5 percent.
In the present invention, the carbon-doped yarn may be formed of modacrylic carbon-doped fiber without adding any other fiber.
< open width >
And splitting the woven cylindrical gray fabric along the splitting line to obtain the open-width package knitted gray fabric. This facilitates the pre-setting.
< Preset formation >
And (3) pre-shaping the grey cloth obtained in the step (2).
In the invention, the presetting temperature is 150-180 ℃, preferably 155-170 ℃, and more preferably 160-170 ℃. The vehicle speed is 15-25 m/min, preferably 16-22 m/min, and more preferably 18-20 m/min. No auxiliary agent is allowed to be contaminated in the pre-setting process. Therefore, the internal stress can be eliminated, and the anti-virus knitted fabric which has a higher bursting strength value and meets the gram weight requirement can be obtained.
< washing with Water >
And (4) putting the knitted fabric obtained in the step (3) into clean water for washing, and performing dehydration treatment after washing.
In the invention, the temperature of the clean water is 45-65 ℃, preferably 50-65 ℃ and more preferably 55-65 ℃ during washing. The bath ratio is 1:4 to 6, preferably 1:4 to 5.5, and more preferably 1:4 to 5. In the present invention, the bath ratio refers to the volume ratio of the knitted fabric to the clear water. Washing with clean water for 15-30 min, preferably 20-30 min, and more preferably 25-30 min. This is advantageous for improving the gas defense of the gas defense knitted fabric.
In the invention, after the cloth in each cylinder is washed, the next cylinder is washed by changing water again, and after the cloth is washed, dehydration treatment is carried out. It may be dehydrated by using a dehydration process like spin-drying in a washing machine or naturally dried.
< shaping >
And (5) shaping the knitted fabric obtained in the step (4) to obtain the gas-defense knitted fabric.
In the invention, the setting temperature is 150-180 ℃, preferably 155-175 ℃, and more preferably 160-170 ℃. The vehicle speed is 15-25 m/min, preferably 15-23 m/min, and more preferably 15-20 m/min. Thus, the anti-virus knitted fabric with higher bursting strength value is obtained.
The breadth of the obtained anti-virus knitted fabric is 125-145 cm, and preferably 138-142 cm. The gram weight is 280-320 g/m 2 Preferably 290 to 310g/m 2
According to one embodiment of the present invention, a method for producing a virus-preventive knitted fabric includes the steps of:
(1) weaving: weaving the carbon-doped yarns and the coated yarns into knitted grey cloth; the carbon-doped yarns and the wrapping yarns are woven according to the quantity ratio of 1:1, and the weaving humidity is 65-75%; the tissue structure is flat needle tissue, variable flat needle tissue or rib tissue;
the covered yarn is a core-spun yarn which is spun by covering spandex filament with other chemical fiber filaments except spandex; the carbon-doped yarn is a single yarn prepared from modacrylic carbon-doped fiber; the linear density of the carbon-doped yarn is 25.6-49.2 tex; the loom is an E12 circular weft knitting machine; the loom had a 34 inch diameter; the chemical fiber filaments except the spandex are selected from at least one of polyester filaments and nylon filaments;
(2) scutching: splitting the woven cylindrical gray fabric along a splitting line to obtain an open-width package knitted gray fabric;
(3) presetting: pre-shaping the grey cloth obtained in the step (2); the presetting temperature is 150-180 ℃, and the vehicle speed is 15-25 m/min;
(4) washing with water: washing the knitted fabric obtained in the step (3) in clear water, and then carrying out dehydration treatment;
(5) shaping: and (5) shaping the knitted fabric obtained in the step (4), wherein the shaping temperature is 150-180 ℃, and the vehicle speed is 15-25 m/min, so that the gas-proof knitted fabric is obtained.
The invention also provides the anti-virus knitted fabric produced by the production method. The benzene absorption amount of the obtained anti-poison knitted fabric is not less than 4%. The higher the benzene absorption amount is, the more excellent the gas defense performance is. The air permeability of the obtained toxicity-releasing knitted fabric is not less than 300 mm/s. Higher air permeability indicates better air permeability. The bursting strength of the obtained anti-virus knitted fabric is not less than 450N. The larger the burst strength value is, the better the local anti-destruction performance of the anti-virus knitted fabric is. The anti-virus knitted fabric has high bursting strength on the basis of good anti-virus performance and air permeability.
< test methods >
Air permeability test method: GB/T5453-1997 determination of the air permeability of textile fabrics.
The bursting strength test method comprises the following steps: the steel ball method for measuring the bursting strength of textiles according to GB/T19976-.
Testing of benzene uptake:
the determination principle is as follows: under the specified test conditions, an air flow containing a certain benzene vapor concentration was continuously passed through the carbon-doped fiber, and the carbon-doped fiber adsorbed benzene vapor and then increased in mass, the increase in the amount being represented by the elongation of the quartz spring. Since the elongation of the quartz spring is proportional to the incremental value of the carbon-doped fiber, the amount of carbon-doped fiber adsorbed at a standard benzene vapor concentration can be measured.
The specific operation steps are as follows: 1) the height h of a tray (the tray is used for placing carbon-doped yarns and is connected with a spring) is measured through a height measuring instrument 0 (ii) a 2) Adding a sample to be tested (the carbon-doped yarn prepared by the invention) into the tray, so that the base cloth of the tray is fully paved, and measuring the height h of the tray 1 (ii) a 3) Opening benzene vapor generator, allowing it to pass through the sample to be measured for 5min until adsorption balance is reached, and measuring the height h of the tray after adsorption 2 (ii) a 4) Calculating by using a calculation formula:
the benzene absorption amount is% 2 -h 1 )/(h 1 -h 0 )×100%。
Preparation example
(1) Blowing and carding: mixing, opening and cleaning selected carbon-doped modacrylic fiber raw materials by an opening and picking machine, and removing impurities; feeding the carbon-doped nitrile-chlorine fiber after opening to a carding machine, further removing impurities and non-spinnable fiber, and obtaining raw sliver; wherein in the carbon-doped modacrylic fiber, the weight ratio of the modacrylic to the active carbon is 85: 15; the linear density of the modacrylic carbon-doped fiber is 3.6dtex, the deviation of the linear density is 9 percent, the breaking strength is 1.6cN/dtex, and the elongation at break is 25 percent;
(2) preparing strips: the raw sliver is made into uniform yarn lines by a compression roller and a coiler device, wherein the speed of a front roller is 112 r/min;
(3) drawing: feeding the yarn strips into a drawing frame, and performing drawing-drafting-mixing-slivering procedures to obtain cooked slivers; wherein, the quantitative of the cooked slivers is 3.5g/m, the weight unevenness is 5 percent, and the drawing is three-pass drawing; wherein, the speed of the front roller of the first drawing is 247 r/min; the speed of the front roller of the second drawing is 237 r/min; the speed of the front roller of the third drawing is 225 r/min;
(4) roving: drafting, twisting and winding the drawn sliver into roving; wherein, the twist is 25 twists/m, the drafting multiple is 13 times, the speed of the front roller is 160r/min, and the speed of the spindle is 250 r/min; the quantitative dry weight of the roving is 3.9g/10 m;
(5) spinning: drafting, twisting and winding the rough yarn to obtain spun yarn; wherein, the twist is 550 twist/m, the drafting multiple is 15 times, the speed of the front roller is 130r/min, and the speed of the spindle is 6900 r/min; the quantitative dry weight of the spun yarn is 2.0g/50 m;
(6) spooling: and processing the yarn into a bobbin meeting certain requirements on a bobbin winder to obtain the carbon-doped yarn.
The linear density of the carbon-doped yarn (single yarn) obtained in the preparation example is 36.9tex, and the deviation of the linear density is 2.5%.
Example 1
(1) Weaving: weaving the carbon-doped yarns and the covering yarns obtained in the preparation example into knitted grey cloth; the carbon-doped yarn is a single yarn prepared from modacrylic carbon-doped fiber; the linear density of the carbon-doped yarn is 36.9tex, the coating yarn is core-spun yarn spun by spandex filament and nylon filament, namely the coating yarn is nylon-ammonia coating yarn, and the linear density of the coating yarn is 20/20D. The weaving machine is an E12 circular weft knitting machine, the cylinder diameter of the weaving machine is 34 inches, the carbon-doped yarns and the coating yarns are woven in a quantity ratio of 1:1, and the weaving humidity is 75%; the tissue structure is a changed flat needle tissue, as shown in fig. 1 and 2; the E12 circular knitting machine is purchased from Quanzhou Rongtian knitting machinery, Inc., and has the specific model of RT-34 × 54F;
(2) scutching: splitting the woven cylindrical gray fabric along a splitting line to obtain an open-width package knitted gray fabric;
(3) presetting: pre-shaping the grey cloth obtained in the step (2); the presetting temperature is 165 ℃, the vehicle speed is 18m/min, and any auxiliary agent is not allowed to be polluted in the presetting process;
(4) washing with water: washing the knitted fabric obtained in the step (3) in clean water at the temperature of 60 ℃, wherein the bath ratio is 1:4, the knitted fabric is washed with the clean water for 20 minutes, the knitted fabric in each cylinder is washed, the water is changed again to wash the next cylinder, and the knitted fabric is dehydrated after being washed;
(5) shaping: shaping the knitted fabric obtained in the step (4), wherein the shaping temperature is 165 ℃, the speed is 18m/min, any auxiliary agent is not allowed to be contaminated in the shaping process, the obtained width is 140cm, and the gram weight is 290g/m 2 The gas defense knitted fabric of (1).
The benzene absorption amount of the anti-poison knitted fabric obtained in the embodiment is 4.5%; the air permeability is 328 mm/s; the burst strength was 495N.
Example 2
The only difference from example 1 is that the nylon-coated yarn has a linear density of 20/30D.
The anti-virus knitted fabric obtained in this example had a benzene absorption of 4.2%, an air permeability of 305mm/s, and a burst strength of 515N.
Example 3
The only difference from example 1 is that the covering yarn used is a core spun yarn of spandex and polyester filament, i.e., the covering yarn is polyester-spandex covering yarn, and the linear density of the covering yarn is 70/20D.
The knitted gas barrier fabric obtained in this example had a benzene absorption of 4.0%, an air permeability of 309mm/s, and a burst strength of 569N.
Comparative example 1
The only difference from example 1 is that the selected carbon-doped yarn has a linear density of 59tex and no covering filament is used. The anti-poison knitted fabric is not successfully woven by adopting the method for weaving on a machine because the carbon-doped yarns are broken for a plurality of times, the fabric structure is loose, the fabric does not have tensile property, and the bursting strength is poor.
Comparative example 2
The difference from example 1 is only that the weaving machine specification selected is an E20 cylinder machine. The gas-proof knitted fabric is not successfully woven due to the fact that carbon-doped yarns break repeatedly when the machine type is adopted for weaving.
Comparative example 3
The difference from the example 1 is that the tissue structure is a double-sided ribbing tissue, and the linear density of the nylon-ammonia coated yarn is 70/20D. The anti-poison knitted fabric woven by adopting the weave structure on a machine is thicker, and the gram weight of the anti-poison knitted fabric is 410g/m 2 And the content of the carbon-doped yarn is low, so that the benzene absorption amount is low and is only 3 percent.
TABLE 1
Figure BDA0003015806750000131
The "-" in table 1 means that a qualified knitted fabric cannot be spun, and the yarn breakage rate is extremely high; "+ +" means not detected.
In example 1 and comparative example 2, the linear density of 20/20D means that the linear density of the nylon filaments used in the covered yarn was 20D and the linear density of the spandex filaments was 20D. In example 2, the linear density of 20/30D means that the linear density of the nylon filaments used in the covered yarn was 20D and the linear density of the spandex filaments was 30D. In example 3, the linear density of 70/20D means that the linear density of the polyester filaments used in the covered yarn was 70D and the linear density of the spandex filaments was 20D. In comparative example 3, the linear density of 70/20D means that the linear density of the nylon filaments used in the covered yarn was 70D and the linear density of the spandex filaments was 20D.
Compared with the comparative examples 1 to 3, the anti-virus knitted fabric prepared by the production method of the examples 1 to 3 has a higher bursting strength value and has better anti-virus performance and air permeability. Therefore, the method can successfully overcome the problem that the carbon-doped yarn containing the nitrile-chlorine fiber has low strength and is difficult to weave, and the anti-virus knitted fabric with better performance is obtained. In addition, the production methods according to comparative examples 1 to 2 failed to produce the gas-proof knitted fabric because the carbon-doped yarns were broken repeatedly. Although the knitted fabric for gas defense was obtained according to the production method of comparative example 3, the benzene absorption amount was low and the gas defense performance was goodIs poor, and the woven gas-proof knitted fabric is thicker, and the gram weight is 410g/m 2
The present invention is not limited to the above-described embodiments, and any variations, modifications, and substitutions which may occur to those skilled in the art may be made without departing from the spirit of the invention.

Claims (7)

1. The production method of the gas-proof knitted fabric is characterized by comprising the step of knitting carbon-doped yarns and covering yarns into knitted grey fabric; wherein, the first and the second end of the pipe are connected with each other,
the carbon-doped yarns and the wrapping yarns are woven in a quantity ratio of 1-2: 1; the tissue structure is flat needle tissue or variable flat needle tissue;
the covered yarn is a core-spun yarn which is spun by covering spandex filament with other chemical fiber filaments except spandex; the other chemical fiber filaments are selected from at least one of polyester filaments and nylon filaments; the linear density of the other chemical fiber filaments is 20-70D, and the linear density of the spandex filaments is 20-50D;
the carbon-doped yarn is a single yarn prepared from modacrylic carbon-doped fiber; the linear density of the carbon-doped yarn is 25.6-49.2 tex;
the benzene absorption amount of the anti-virus knitted fabric is not less than 4%; the air permeability is not less than 300 mm/s; the bursting strength is not less than 450N.
2. The production method of claim 1, wherein the linear density of the carbon-doped yarn is 28.1-42.1 tex.
3. A method as claimed in claim 1, wherein the loom used is an E12 circular loom.
4. The production method according to claim 1, wherein the linear density of the other chemical fiber filaments is 20 to 60D, and the linear density of the spandex filament is 20 to 40D.
5. The production method according to claim 1, wherein the carbon-doped modacrylic fiber is activated carbon-loaded modacrylic; the weight ratio of the modacrylic to the activated carbon is 77-95: 5-23.
6. The production method according to claim 1, characterized by comprising the following specific steps:
(1) weaving: weaving the carbon-doped yarns and the coated yarns into knitted grey cloth; wherein the weaving humidity is 65-75%;
(2) scutching: splitting the woven cylindrical gray fabric along a splitting line to obtain an open-width package knitted gray fabric;
(3) presetting: pre-shaping the grey cloth obtained in the step (2); the presetting temperature is 150-180 ℃, and the vehicle speed is 15-25 m/min;
(4) washing with water: washing the knitted fabric obtained in the step (3) in clear water, and then carrying out dehydration treatment;
(5) shaping: and (5) shaping the knitted fabric obtained in the step (4), wherein the shaping temperature is 150-180 ℃, and the vehicle speed is 15-25 m/min, so that the gas-proof knitted fabric is obtained.
7. The production method according to claim 6, characterized in that:
in the step (3), the presetting temperature is 155-170 ℃, and the vehicle speed is 16-22 m/min;
in the step (4), the temperature of clear water is 45-65 ℃, and the bath ratio is 1: 4-6; washing with clear water for 15-30 min;
in the step (5), the setting temperature is 155-175 ℃, the vehicle speed is 17-23 m/min, the breadth of the obtained anti-virus knitted fabric is 125-145 cm, and the gram weight is 280-320 g/m 2
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