CN113756089B - Low-air-permeability fabric and preparation method and application thereof - Google Patents
Low-air-permeability fabric and preparation method and application thereof Download PDFInfo
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- CN113756089B CN113756089B CN202111248405.3A CN202111248405A CN113756089B CN 113756089 B CN113756089 B CN 113756089B CN 202111248405 A CN202111248405 A CN 202111248405A CN 113756089 B CN113756089 B CN 113756089B
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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
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/46—Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic System; Titanates; Zirconates; Stannates; Plumbates
-
- 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
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/285—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acid amides or imides
-
- 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
- D06M2101/32—Polyesters
-
- 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
Abstract
The invention provides a low-air-permeability fabric and a preparation method and application thereof, and relates to the technical field of textile production. A method for preparing a low air permeability fabric comprising the steps of: s1: spinning the PET slice, the polyamide slice and the polyester slice respectively to obtain PET fiber, polyamide fiber and polyester fiber respectively; blending PET fibers with polyamide fibers or/and polyester fibers to obtain blended yarns, and weaving the blended yarns into blended fabrics; s2: padding the blended fabric by using titanium dioxide sol to obtain a pretreated blended fabric; s3: and coating the surface of the pretreated blended fabric by using a coating to form a coating, so as to obtain the fabric with low air permeability. The invention also provides a low air permeability fabric prepared by the method and application thereof. The invention can prepare the low air permeability fabric with high adhesive strength between the base cloth and the coating, high air tightness, high water resistance and the like.
Description
Technical Field
The invention relates to the technical field of textile production, in particular to a low-air-permeability fabric and a preparation method and application thereof.
Background
Products in the field of protection and lifesaving such as emergency evacuation slides, helicopter buoyancy bags, lifeboat products and the like are produced by using low-air-permeability fabrics.
At present, the common low air permeability fabric is that the surface of polyamide cloth is coated with a urethane coating; however, the polyamide cloth has low adhesive strength with the urethane coating, and also has low properties such as air tightness and water resistance.
Disclosure of Invention
The first object of the present invention is to provide a method for producing a low air permeability fabric, which can improve the adhesive strength between a base fabric and a coating material, and at the same time improve the air tightness, water resistance, etc. of the fabric.
The second aim of the invention is to provide a low air permeability fabric which has high adhesive strength between the base cloth and the coating and has higher air tightness, water resistance and other performances.
A third object of the present invention is to provide the use of a low air permeability fabric for the production of emergency evacuation slides, helicopter flotation bladders and lifeboat products.
The embodiment of the invention is realized by the following technical scheme:
1. a method for preparing a low air permeability fabric comprising the steps of:
s1: spinning the PET slice, the polyamide slice and the polyester slice respectively to obtain PET fiber, polyamide fiber and polyester fiber respectively; blending PET fibers with polyamide fibers or/and polyester fibers to obtain blended yarns, and weaving the blended yarns into blended fabrics;
s2: padding the blended fabric by using titanium dioxide sol to obtain a pretreated blended fabric;
s3: and coating the surface of the pretreated blended fabric by using a coating to form a coating, so as to obtain the fabric with low air permeability.
Further, in the step S1, the PET fibers and the polyamide fibers or/and the polyester fibers are drawn according to the weight ratio of (1-2), the blended yarns are prepared through the working procedures of roving, spinning and double twisting, and then the blended yarns are woven into the blended fabric through tatting.
Further, the titanium dioxide sol in the step S2 is prepared from tetrabutyl titanate, absolute ethyl alcohol, hydrochloric acid and water by a sol-gel method.
Further, the specific preparation method of the titanium dioxide sol comprises the following steps: dripping 2-3 ml of tetrabutyl titanate into 20-30 ml of absolute ethyl alcohol, vigorously stirring at room temperature, and continuously stirring after dripping to obtain transparent and uniform light yellow solution; 2-3 ml of absolute ethyl alcohol, concentrated hydrochloric acid and water are added dropwise under vigorous stirring according to the volume ratio of (1-2) to 1:1, and the stirring is continued for 50-60 min after the dripping, so that uniform and transparent titanium dioxide sol is obtained.
Further, the specific processing method in the step S2 is as follows: immersing the blended fabric into titanium dioxide sol for 10-18 min according to the bath ratio of 1 (10-15), and performing twice soaking and twice rolling, wherein the rolling liquid rate is 70-80%; drying at 60-65 deg.c for 5-8 min and curing at 140-150 deg.c for 3-6 min to obtain the pre-treated blended fabric.
Further, the coating in the step S3 comprises the following components in parts by weight: 40-50 parts of azodiisobutyronitrile, 20-25 parts of methacrylic acid, 18-22 parts of styrene and 30-40 parts of acrylamide.
Further, the preparation method of the coating comprises the following steps: mixing methacrylic acid, styrene and acrylamide according to parts by weight, adding one half of azodiisobutyronitrile according to parts by weight, and stirring and prepolymerizing for 50-60 min at 70-75 ℃; and adding the rest weight parts of azodiisobutyronitrile, stirring at 40-45 ℃ for reaction for 55-60 min, heating to 80-85 ℃ and continuing to react until the azodiisobutyronitrile is sticky.
Further, the specific processing method in the step S3 is as follows: 25-35 g/m 2 The surface of the pretreated blended fabric is coated by the coating feeding amount, and the coating process is dried for 40-80 s at 150-160 ℃.
A low air permeability fabric having an air permeability of no more than 15L/m 2 ·s。
The application of the low air permeability fabric is used for producing emergency evacuation slides, helicopter buoyancy bags and lifeboat products.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
1. the invention adopts PET fiber and polyamide fiber or/and polyester fiber blended woven fabric, and is matched with the preparation method, so that the adhesive strength of the base cloth and the paint can be effectively improved, and the invention has higher performances of air tightness, water resistance and the like.
2. The invention adopts titanium dioxide sol to pretreat the fabric, so that the surface of the fabric forms a micro-rough structure, and the coating with stronger adhesion is matched, thereby effectively improving the adhesive strength of the base fabric and the coating.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The low air permeability fabric, the preparation method and the application thereof provided by the embodiment of the invention are specifically described below.
Example 1
The embodiment provides a preparation method of a low air permeability fabric, which comprises the following steps:
s1: spinning the PET slice and the polyamide slice respectively to obtain PET fiber and polyamide fiber respectively; drawing PET fibers and polyamide fibers according to a weight ratio of 2:1, preparing blended yarns through roving, spinning and double twisting processes, and weaving the blended yarns into blended fabrics through tatting;
s2: immersing the blended fabric into titanium dioxide sol for 10min according to a bath ratio of 1:10, and performing twice immersion and twice rolling, wherein the rolling liquid rate is 70%; drying at 60 ℃ for 5min, and curing at 140 ℃ for 3min to obtain a pretreated blended fabric; the specific preparation method of the titanium dioxide sol comprises the following steps: dropwise adding 2ml of tetrabutyl titanate into 20ml of absolute ethyl alcohol, stirring vigorously at room temperature, and continuously stirring after the dropwise addition to obtain transparent and uniform light yellow solution; dropwise adding 2ml of mixed solution of absolute ethyl alcohol, concentrated hydrochloric acid and water according to the volume ratio of 1:1:1 under vigorous stirring, and continuously stirring for 50min after the dropwise adding to obtain uniform and transparent titanium dioxide sol;
s3: by 25g/m 2 Coating the surface of the pretreated blended fabric with the coating feeding amount, and drying the surface at 150 ℃ for 40s in the coating process to obtain the fabric with low air permeability; the coating comprises the following components in parts by weight: 40 parts of azodiisobutyronitrile, 20 parts of methacrylic acid, 18 parts of styrene and 30 parts of acrylamide; mixing methacrylic acid, styrene and acrylamide according to parts by weight, adding one half of azodiisobutyronitrile according to parts by weight, and stirring and prepolymerizing for 50min at 70 ℃; and adding the rest parts by weight of azodiisobutyronitrile, stirring at 40 ℃ for reaction for 55min, and heating to 80 ℃ for continuous reaction until the azodiisobutyronitrile is sticky to prepare the coating.
This example provides a low air permeability fabric, designated a, made.
Example 2
The embodiment provides a preparation method of a low air permeability fabric, which comprises the following steps:
s1: spinning the PET slice and the polyester slice respectively to obtain PET fiber and polyester fiber respectively; drawing PET fibers and polyester fibers according to a weight ratio of 1:1, preparing blended yarns through roving, spinning and double twisting processes, and weaving the blended yarns into blended fabrics through tatting;
s2: immersing the blended fabric into titanium dioxide sol for 15min according to a bath ratio of 1:10, and performing twice immersion and twice rolling, wherein the rolling liquid rate is 75%; drying at 60 ℃ for 6min, and curing at 145 ℃ for 4min to obtain a pretreated blended fabric; the specific preparation method of the titanium dioxide sol comprises the following steps: dropwise adding 2ml of tetrabutyl titanate into 25ml of absolute ethyl alcohol, stirring vigorously at room temperature, and continuously stirring after the dropwise addition to obtain transparent and uniform light yellow solution; dropwise adding 2ml of mixed solution of absolute ethyl alcohol, concentrated hydrochloric acid and water according to the volume ratio of 2:1:1 under vigorous stirring, and continuously stirring for 55min after the dropwise adding to obtain uniform and transparent titanium dioxide sol;
s3: by 30g/m 2 Coating the surface of the pretreated blended fabric with the coating feeding amount, and drying the surface at 155 ℃ for 60s in the coating process to obtain the fabric with low air permeability; the coating comprises the following components in parts by weight: 45 parts of azobisisobutyronitrile, 22 parts of methacrylic acid, 20 parts of styrene and35 parts of acrylamide; mixing methacrylic acid, styrene and acrylamide according to parts by weight, adding one half of azodiisobutyronitrile according to parts by weight, and stirring and prepolymerizing for 55min at 70 ℃; and adding the rest parts by weight of azodiisobutyronitrile, stirring at 40 ℃ for reaction for 55min, and heating to 80 ℃ for continuous reaction until the azodiisobutyronitrile is sticky to prepare the coating.
This example provides a low air permeability fabric, designated B, made.
Example 3
The embodiment provides a preparation method of a low air permeability fabric, which comprises the following steps:
s1: spinning the PET slice, the polyamide slice and the polyester slice respectively to obtain PET fiber, polyamide fiber and polyester fiber respectively; drawing PET fibers, polyamide fibers and polyester fibers according to a weight ratio of 2:1, preparing blended yarns through roving, spinning and double twisting processes, and weaving the blended yarns into blended fabrics through tatting;
s2: immersing the blended fabric into titanium dioxide sol for 18min according to a bath ratio of 1:15, and performing twice immersion and twice rolling, wherein the rolling liquid rate is 80%; drying at 65 ℃ for 8min, and curing at 150 ℃ for 6min to obtain a pretreated blended fabric; the specific preparation method of the titanium dioxide sol comprises the following steps: 3ml of tetrabutyl titanate vinegar is added into 30ml of absolute ethyl alcohol in a dropwise manner, and the mixture is stirred vigorously at room temperature, and the mixture is stirred continuously after the dripping is finished, so that a transparent and uniform light yellow solution is obtained; dropwise adding 3ml of mixed solution of absolute ethyl alcohol, concentrated hydrochloric acid and water according to the volume ratio of 2:1:1 under vigorous stirring, and continuously stirring for 60min after the dropwise adding to obtain uniform and transparent titanium dioxide sol;
s3: by using 35g/m 2 Coating the surface of the pretreated blended fabric with the coating feeding amount, and drying the surface for 80 seconds at 160 ℃ in the coating process to obtain a fabric with low air permeability; the coating comprises the following components in parts by weight: 50 parts of azodiisobutyronitrile, 25 parts of methacrylic acid, 22 parts of styrene and 40 parts of acrylamide; mixing methacrylic acid, styrene and acrylamide according to parts by weight, adding one half of azodiisobutyronitrile according to parts by weight, and stirring and prepolymerizing for 60min at 70 ℃; adding the rest weight parts of azodiisobutyronitrile, stirring at 40 ℃ for reaction for 60min, heating to 80 ℃ for continuous reaction until the azodiisobutyronitrile is sticky,the coating is prepared.
This example provides a low air permeability fabric, designated C, made.
Comparative example 1
The comparative example provides a method for preparing a low air permeability fabric, comprising the following steps:
s1: spinning the polyamide slice to obtain polyamide fiber; drawing cotton fibers and polyamide fibers according to a weight ratio of 1:1, preparing blended yarns through roving, spinning and double twisting processes, and weaving the blended yarns into blended fabrics through tatting;
s2: by 25g/m 2 The urethane coating material loading amount of the (2) is used for coating the surface of the blended fabric, and the coating process is dried at 150 ℃ for 40s, so that the fabric with low air permeability is obtained.
This comparative example provides a low air permeability fabric produced, designated M1.
Comparative example 2
The comparative example provides a method for preparing a low air permeability fabric, comprising the following steps:
s1: spinning the PET slice and the polyester slice respectively to obtain PET fiber and polyester fiber respectively; drawing PET fibers and polyester fibers according to a weight ratio of 1:1, preparing blended yarns through roving, spinning and double twisting processes, and weaving the blended yarns into blended fabrics through tatting;
s2: immersing the blended fabric into titanium dioxide sol for 10min according to a bath ratio of 1:10, and performing twice immersion and twice rolling, wherein the rolling liquid rate is 70%; drying at 60 ℃ for 5min, and curing at 140 ℃ for 3min to obtain a pretreated blended fabric; the specific preparation method of the titanium dioxide sol comprises the following steps: dropwise adding 2ml of tetrabutyl titanate into 20ml of absolute ethyl alcohol, stirring vigorously at room temperature, and continuously stirring after the dropwise addition to obtain transparent and uniform light yellow solution; dropwise adding 2ml of mixed solution of absolute ethyl alcohol, concentrated hydrochloric acid and water according to the volume ratio of 1:1:1 under vigorous stirring, and continuously stirring for 50min after the dropwise adding to obtain uniform and transparent titanium dioxide sol;
s3: by 25g/m 2 The urethane coating material loading amount of the (2) is used for coating the surface of the blended fabric, and the coating process is dried at 150 ℃ for 40s, so that the fabric with low air permeability is obtained.
This comparative example provides a low air permeability fabric produced, designated M2.
Comparative example 3
The comparative example provides a method for preparing a low air permeability fabric, comprising the following steps:
s1: spinning the PET slice and the polyester slice respectively to obtain PET fiber and polyester fiber respectively; drawing PET fibers and polyester fibers according to a weight ratio of 1:1, preparing blended yarns through roving, spinning and double twisting processes, and weaving the blended yarns into blended fabrics through tatting;
s2: by 25g/m 2 Coating the surface of the pretreated blended fabric with the coating feeding amount, and drying the surface at 150 ℃ for 40s in the coating process to obtain the fabric with low air permeability; the coating comprises the following components in parts by weight: 40 parts of azodiisobutyronitrile, 20 parts of methacrylic acid, 18 parts of styrene and 30 parts of acrylamide; mixing methacrylic acid, styrene and acrylamide according to parts by weight, adding one half of azodiisobutyronitrile according to parts by weight, and stirring and prepolymerizing for 50min at 70 ℃; and adding the rest parts by weight of azodiisobutyronitrile, stirring at 40 ℃ for reaction for 55min, and heating to 80 ℃ for continuous reaction until the azodiisobutyronitrile is sticky to prepare the coating.
This comparative example provides a low air permeability fabric produced, designated M3.
Experimental example 1
The average peel force was measured according to GB/T31334.1-2015 for the products A to C prepared in examples 1 to 3 having a width of 25mm and a length of 200mm and for the products M1 to M3 prepared in comparative examples 1 to 3, and the average adhesive strength was calculated for each of three parallel groups, and the results are shown in Table 1.
Adhesive strength (N/mm) =average peel force (N)/specimen width (mm)
TABLE 1 adhesive Strength
| Sample of | Adhesive strength (N/mm) |
| A | 21 |
| B | 21.2 |
| C | 21 |
| M1 | 8 |
| M2 | 16.8 |
| M3 | 12 |
As can be seen from Table 1, the adhesive strength of the base fabrics and the coating materials of the low air permeability fabrics prepared by the present invention is higher, while the adhesive strength of the base fabrics and the coating materials of the products M1 to M3 prepared by the comparative examples 1 to 3 is lower; the product M1 produced in comparative example 1 was coated with a urethane coating on the surface of a polyamide cloth using a conventional method; the product M2 produced in comparative example 2 was a woven fabric of PET fibers and polyamide fibers or/and polyester fibers blended and pretreated by a titania sol, but was coated with a urethane coating; the product M3 produced in comparative example 3 was not subjected to the titania sol pretreatment; the invention is described that the low air permeability fabric is prepared by adopting PET fiber and polyamide fiber or/and polyester fiber blended weaving fabric, adopting titanium dioxide sol pretreatment and coating novel paint, and the adhesive strength between the base fabric and the paint is higher.
Experimental example 2
The air permeability of the products A to C prepared in examples 1 to 3 and the products M1 to M3 prepared in comparative examples 1 to 3, each having a width of 150mm and a length of 200mm, was measured according to GB/T5453-1997, and the results are shown in Table 2.
Air permeability R (L/m) 2 ·s)＝qv/A×0.167
Wherein qv-average air flow, L/min;
a-test area, cm 2 。
Table 2 air permeability
| Sample of | Air permeability (L/m) 2 ·s) |
| A | 14.5 |
| B | 13.8 |
| C | 14.6 |
| M1 | 24.1 |
| M2 | 20.5 |
| M3 | 18.3 |
As can be seen from Table 2, the low air permeability fabrics prepared by the present invention have lower air permeability, while the products M1 to M3 prepared by comparative examples 1 to 3 have higher air permeability; the product M1 produced in comparative example 1 was coated with a urethane coating on the surface of a polyamide cloth using a conventional method; the product M2 produced in comparative example 2 was a woven fabric of PET fibers and polyamide fibers or/and polyester fibers blended and pretreated by a titania sol, but was coated with a urethane coating; the product M3 produced in comparative example 3 was not subjected to the titania sol pretreatment; the invention shows that the low air permeability fabric prepared by adopting the PET fiber and the polyamide fiber or/and the polyester fiber blended woven fabric and matching the preparation method and the novel coating has better air tightness.
Experimental example 3
The time for occurrence of abnormal phenomena such as water permeation, wetting, damage and the like of the product samples was measured according to GB 5571-1985 by taking products A to C prepared in examples 1 to 3 having a width of 150mm and a length of 200mm and products M1 to M3 prepared in comparative examples 1 to 3, and the results are shown in Table 3.
TABLE 3 Water resistance
| Sample of | Abnormal time (min) |
| A | 475 |
| B | 468 |
| C | 480 |
| M1 | 320 |
| M2 | 280 |
| M3 | 305 |
As can be seen from Table 3, the low air permeability fabric prepared by the invention has long time of occurrence of abnormal phenomena such as water permeation, wetting, damage and the like in the test, while the products M1 to M3 prepared by comparative examples 1 to 3 have shorter time of occurrence of abnormal phenomena such as water permeation, wetting, damage and the like in the test; the product M1 produced in comparative example 1 was coated with a urethane coating on the surface of a polyamide cloth using a conventional method; the product M2 produced in comparative example 2 was a woven fabric of PET fibers and polyamide fibers or/and polyester fibers blended and pretreated by a titania sol, but was coated with a urethane coating; the product M3 produced in comparative example 3 was not subjected to the titania sol pretreatment; the invention shows that the low air permeability fabric prepared by adopting the PET fiber and the polyamide fiber or/and the polyester fiber blended woven fabric and matching the preparation method and the novel coating has better water resistance.
In summary, the preparation method of the low-air-permeability fabric provided by the application has the advantages that the adhesive strength between the base cloth and the coating of the prepared low-air-permeability fabric is higher, and the air tightness and the water resistance are better.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for preparing a low air permeability fabric, comprising the steps of:
s1: spinning the PET slice and the polyamide slice respectively to obtain PET fiber and polyamide fiber respectively; blending PET fibers and polyamide fibers to obtain blended yarns, and weaving the blended yarns into blended fabrics;
s2: padding the blended fabric by using titanium dioxide sol to obtain a pretreated blended fabric;
s3: coating the surface of the pretreated blended fabric by using a coating to form a coating, so as to obtain a low-air-permeability fabric;
the coating in the step S3 comprises the following components in parts by weight: 40-50 parts of azodiisobutyronitrile, 20-25 parts of methacrylic acid, 18-22 parts of styrene and 30-40 parts of acrylamide;
the preparation method of the coating comprises the following steps: mixing methacrylic acid, styrene and acrylamide according to parts by weight, adding one half of azodiisobutyronitrile according to parts by weight, and stirring and prepolymerizing for 50-60 min at 70-75 ℃; and adding the rest parts by weight of azodiisobutyronitrile, stirring at 40-45 ℃ for reaction for 55-60 min, heating to 80-85 ℃ and continuing to react until the azodiisobutyronitrile is sticky.
2. The method for producing a low air permeability fabric according to claim 1, wherein the PET fiber and the polyamide fiber in the step S1 are drawn in a weight ratio of (1-2) 1, the blended yarn is produced by roving, spinning and double twisting, and the blended yarn is woven into the blended fabric by weaving.
3. The method for preparing a fabric with low air permeability according to claim 1, wherein the titanium dioxide sol in the step S2 is prepared by a sol-gel method using tetrabutyl titanate, absolute ethyl alcohol, hydrochloric acid and water.
4. The method for preparing a low air permeability fabric according to claim 1, wherein the specific preparation method of the titania sol is: dropwise adding 2-3 ml of tetrabutyl titanate into 20-30 ml of absolute ethyl alcohol, vigorously stirring at room temperature, and continuously stirring after the dropwise adding to obtain a transparent and uniform light yellow solution; and (3) dropwise adding 2-3 ml of absolute ethyl alcohol, concentrated hydrochloric acid and water into the mixed solution according to the volume ratio of (1-2) to 1 under vigorous stirring, and continuously stirring for 50-60 min after the mixing is finished, so as to obtain uniform and transparent titanium dioxide sol.
5. The method for preparing a low air permeability fabric according to claim 1, wherein the specific treatment method in step S2 is as follows: immersing the blended fabric into titanium dioxide sol according to a bath ratio of 1 (10-15) for 10-18 min, and performing twice soaking and twice rolling, wherein the rolling liquid rate is 70-80%; and (3) drying at 60-65 ℃ for 5-8 min, and curing at 140-150 ℃ for 3-6 min to obtain the pretreated blended fabric.
6. The method for producing a low air permeability fabric according to claim 1, wherein the specific treatment method in step S3 is: 25-35 g/m is adopted 2 The surface of the pretreated blended fabric is coated by the coating feeding amount, and the coating process is dried for 40-80 s at 150-160 ℃.
7. A low air permeability fabric produced by the production method according to any one of claims 1 to 6, characterized in that the air permeability of the low air permeability fabric is not more than 15L/m 2 ·s。
8. Use of a low air permeability fabric produced by the production process according to any one of claims 1 to 6 or a low air permeability fabric according to claim 7 for the production of emergency evacuation slides, helicopter buoyancy sacs and lifeboat products.
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