Double-layer flame-retardant fabric and manufacturing process thereof

Abstract

The application relates to the technical field of flame-retardant fabrics, and discloses a double-layer flame-retardant fabric and a manufacturing process thereof. The process comprises fiber pretreatment, spinning and weaving, flame-retardant treatment, adhesive preparation and laminated compounding. Through the double-layer structure design of outer-layer flame-retardant fibers and inner-layer comfort fibers and the combination of flame-retardant agent impregnation treatment, the fabric has good flame retardance and comfort at the same time, the safety and wearing experience of the fabric in the use process are ensured, and the application range of the fabric is expanded. Through degreasing, cleaning and drying treatment, the fiber surface state is optimized, and the polyurethane resin, the acrylate emulsion, the flame-retardant additive and the crosslinking agent are mixed to prepare the adhesive, so that the bonding force between the outer-layer fabric and the inner-layer fabric is enhanced, the interlayer adhesive strength and the durability of the fabric are improved, and the delamination problem is avoided.

Description

Technical Field

[0001] This invention relates to the field of flame-retardant fabric technology, specifically to a double-layer flame-retardant fabric and its manufacturing process. Background Technology

[0002] Flame-retardant fabrics are made of materials that inherently possess flame-retardant properties, such as fabrics made of aramid or acrylic fibers. Another type is made by adding a flame-retardant coating to cotton or polyester fabrics to achieve a flame-retardant effect. Flame-retardant fabrics themselves have extremely strong flame-retardant properties and can be used in fields such as interior decoration materials, protective clothing, and industrial textiles.

[0003] Currently, because traditional flame-retardant fabrics mostly use a single-layer structure or simple coating process, when double-layer flame-retardant fabrics are laminated, the interlayer bonding force between the outer flame-retardant fiber and the inner comfort fiber is insufficient. If the adhesive is unevenly distributed or the hot-pressing curing parameters are not properly controlled during the lamination process, the fabric may delaminate or its durability may decrease, making it impossible to guarantee the long-term stability of flame-retardant performance and comfort.

[0004] Therefore, a double-layer flame-retardant fabric and its manufacturing process are proposed to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a double-layer flame-retardant fabric and its manufacturing process, which solves the problems mentioned in the background art, such as fabric delamination or decreased durability, and the inability to guarantee the long-term stability of flame-retardant performance and comfort.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a manufacturing process for a double-layer flame-retardant fabric, characterized by comprising the following steps: Step 1: Fiber pretreatment. Select the outer flame-retardant fiber and the inner comfort fiber, and perform degreasing, washing and drying treatments respectively. Step 2: Spinning and weaving. The pretreated outer flame-retardant fibers and inner comfort fibers are spun into yarns, and then woven into outer and inner fabrics by a loom. Step 3: Flame retardant treatment, the outer layer of the woven fabric is impregnated with flame retardant using a padding device; Step 4: Adhesive preparation, mixing polyurethane resin, acrylate emulsion, flame retardant additive and crosslinking agent to prepare adhesive; Step 5: Lamination and bonding. The flame-retardant outer and inner fabrics are evenly coated with adhesive using a coating equipment, and then laminated and cured in a hot press to obtain a double-layer flame-retardant fabric. In step three, the impregnation solution for flame retardant impregnation treatment is made from the following raw materials in parts by weight: 40-50 parts of nitrogen-phosphorus flame retardant, 10-15 parts of organosilicon synergist, 30-40 parts of water, and 5-10 parts of dispersant. In step five, the temperature of the hot press during lamination curing is set to 120-150℃, the pressure is set to 5-8MPa, and the curing time is 1-2 hours.

[0007] Preferably, the fiber pretreatment in step one includes the following steps: The outer flame-retardant fiber and the inner comfort fiber are soaked separately in degreasing solution for 1-2 hours at room temperature. During the soaking process, the fibers are stirred at 100-200 r / min. After soaking, the fibers are removed, rinsed with running water for 10-15 minutes, and then dried at 60-80℃ until the moisture content is less than 5%.

[0008] Preferably, the degreasing solution is composed of ethanol and a surfactant, wherein the mass ratio of ethanol to surfactant is 8:1, the concentration of ethanol is 95%, and the surfactant is one of alkylphenol polyoxyethylene ether or fatty acid glyceride.

[0009] Preferably, the spinning and weaving process in step two includes the following steps: The pretreated fibers are spun into yarn using a ring spinning machine with a yarn count of 40-60 English count. The yarn is then woven in a plain weave using a rapier loom with a weaving speed of 400-600 r / min.

[0010] Preferably, the flame retardant impregnation treatment in step three includes the following steps: immersing the outer fabric in the impregnation solution and letting it stand at room temperature for 30-60 minutes. During the impregnation process, the oscillator is started every 15 minutes to oscillate at 50-100 times / minute for 5 minutes. After the impregnation is completed, the fabric is taken out and pre-dried at 80-100℃ for 10-20 minutes, and then baked at 150-180℃ for 5-10 minutes.

[0011] Preferably, the adhesive preparation in step four includes the following steps: Polyurethane resin and acrylate emulsion are added to a mixing device, the temperature is controlled at 25-35℃, and the mixture is stirred at 300-500 r / min for 15-20 minutes. Then, flame retardant additives and crosslinking agents are added, the speed is increased to 800-1000 r / min, and the mixture is stirred for 25-35 minutes to form a uniform adhesive.

[0012] Preferably, the lamination process in step five includes the following steps: The adhesive is applied between the outer and inner fabric layers at a coating amount of 20-30 g / m², and then fed into a hot press for lamination at a set temperature and pressure. After lamination, the fabric is allowed to cool naturally to room temperature and then wound up and packaged.

[0013] A double-layer flame-retardant fabric includes an outer layer and an inner layer, wherein the outer layer is woven from flame-retardant fibers and the inner layer is woven from comfort fibers, and the outer layer and the inner layer are laminated together by an adhesive. The outer flame-retardant fiber has a fineness of 1.5-2.5 denier, and the inner comfort fiber has a fineness of 1.0-1.8 denier. The outer layer has a thickness of 0.3-0.6 mm, the inner layer has a thickness of 0.2-0.4 mm, and the total fabric thickness is 0.5-1.0 mm. The adhesive is made from the following raw materials in parts by weight: 50-60 parts polyurethane resin, 20-30 parts acrylic emulsion, 10-15 parts flame retardant additive, and 5-10 parts crosslinking agent. The flame-retardant fiber is selected from at least one of aramid fiber, flame-retardant polyester fiber, or flame-retardant cotton fiber, and the comfort fiber is selected from at least one of cotton fiber, modal fiber, or bamboo fiber.

[0014] Preferably, the outer flame-retardant fiber has a weaving density of 180-220 threads / inch, and the inner comfort fiber has a weaving density of 150-200 threads / inch. The adhesive layer has a thickness of 0.05-0.15 mm, and the fabric has a unit area mass of 150-250 g / m². 2 .

[0015] Preferably, the flame retardant additive is at least one of nano-sized aluminum hydroxide, zinc borate, or antimony trioxide, and the crosslinking agent is one of isocyanate crosslinking agents or epoxy crosslinking agents.

[0016] Compared with the prior art, the present invention provides a double-layer flame-retardant fabric and its manufacturing process, which has the following beneficial effects: 1. In this invention, when manufacturing the double-layer flame-retardant fabric, a double-layer structure design of outer flame-retardant fiber and inner comfort fiber is adopted, combined with flame-retardant impregnation treatment, so that the fabric has both good flame retardancy and comfort, ensuring the safety and wearing experience of the fabric during use, and expanding its application range.

[0017] 2. In this invention, during fiber pretreatment and adhesive preparation, the fiber surface state is optimized through degreasing, washing and drying processes, and an adhesive is prepared by mixing polyurethane resin, acrylic emulsion, flame retardant additives and crosslinking agents to enhance the bonding force between the outer and inner fabrics, improve the interlayer bonding strength and durability of the fabric, and avoid delamination problems.

[0018] 3. In this invention, during the lamination process, the temperature, pressure, and time parameters of the hot press are controlled to ensure uniform curing of the adhesive, thereby achieving overall structural stability and performance consistency of the fabric, improving the overall quality and reliability of the double-layer flame-retardant fabric, and ensuring long-term effectiveness of the flame-retardant effect. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: A manufacturing process for a double-layer flame-retardant fabric, characterized by the following steps: Step 1: Fiber pretreatment. Select the outer flame-retardant fiber and the inner comfort fiber, and perform degreasing, washing and drying treatments respectively. Step 2: Spinning and weaving. The pretreated outer flame-retardant fibers and inner comfort fibers are spun into yarns, and then woven into outer and inner fabrics by a loom. Step 3: Flame retardant treatment, the outer layer of the woven fabric is impregnated with flame retardant using a padding device; Step 4: Adhesive preparation, mixing polyurethane resin, acrylate emulsion, flame retardant additive and crosslinking agent to prepare adhesive; Step 5: Lamination and bonding. The flame-retardant outer and inner fabrics are evenly coated with adhesive using a coating equipment, and then laminated and cured in a hot press to obtain a double-layer flame-retardant fabric. In step three, the impregnation solution for the flame retardant impregnation treatment is made from the following raw materials in parts by weight: 40 parts of nitrogen-phosphorus flame retardant, 10 parts of organosilicon synergist, 30 parts of water and 5 parts of dispersant; In step five, the temperature of the hot press during lamination curing is set to 120℃, the pressure is set to 5MPa, and the curing time is 1 hour.

[0021] Step one, fiber pretreatment, includes the following steps: The outer flame-retardant fiber and the inner comfort fiber were soaked in degreasing solution for 1 hour at room temperature. During the soaking process, the fibers were stirred at 100 r / min. After soaking, the fibers were removed, rinsed with running water for 10 minutes, and then dried at 60℃ until the moisture content was less than 5%.

[0022] The degreasing solution consists of ethanol and a surfactant in a mass ratio of 8:1. The ethanol concentration is 95%, and the surfactant is alkylphenol polyoxyethylene ether.

[0023] Step two, the spinning and weaving process, includes the following steps: The pretreated fibers were spun into yarn using a ring spinning machine with a yarn count of 40 English count. The yarn was then woven in a plain weave using a rapier loom with a weaving speed of 400 r / min.

[0024] Step 3, the flame retardant impregnation treatment, includes the following steps: immerse the outer fabric in the impregnation solution and let it stand at room temperature for 30 minutes. During the impregnation process, start the shaker every 15 minutes to shake at 50 times / minute for 5 minutes. After the impregnation is completed, take it out, pre-dry it at 80°C for 10 minutes, and then bake it at 150°C for 5 minutes.

[0025] Step four involves the following steps in preparing the adhesive: Polyurethane resin and acrylate emulsion were added to a mixing device, the temperature was controlled at 25°C, and the mixture was stirred at 300 r / min for 15 minutes. Then, flame retardant additives and crosslinking agents were added, the speed was increased to 800 r / min, and the mixture was stirred for 25 minutes to form a uniform adhesive.

[0026] Step five, lamination, includes the following steps: The adhesive is applied between the outer and inner fabric layers at a coating amount of 20 g / m², and then fed into a hot press for lamination at a set temperature and pressure. After lamination, the fabric is allowed to cool naturally to room temperature and then wound up and packaged.

[0027] A double-layer flame-retardant fabric includes an outer layer and an inner layer, the outer layer being woven from flame-retardant fibers and the inner layer being woven from comfort fibers, the outer layer and the inner layer being laminated together by an adhesive. The outer flame-retardant fiber has a fineness of 1.5 denier, and the inner comfort fiber has a fineness of 1.0 denier. The outer layer is 0.3mm thick, the inner layer is 0.2mm thick, and the total fabric thickness is 0.5mm. The adhesive is made from the following raw materials in parts by weight: 50 parts polyurethane resin, 20 parts acrylic emulsion, 10 parts flame retardant additive, and 5 parts crosslinking agent; Flame-retardant fibers are selected from aramid fibers, and comfort fibers are selected from cotton fibers.

[0028] The outer flame-retardant fiber has a weave density of 180 threads / inch, and the inner comfort fiber has a weave density of 150 threads / inch. The adhesive layer thickness is 0.05mm, and the fabric unit area mass is 150g / m². 2 .

[0029] The flame retardant additive is nano-sized aluminum hydroxide, and the crosslinking agent is an isocyanate crosslinking agent.

[0030] Example 2: A manufacturing process for a double-layer flame-retardant fabric, characterized by the following steps: Step 1: Fiber pretreatment. Select the outer flame-retardant fiber and the inner comfort fiber, and perform degreasing, washing and drying treatments respectively. Step 2: Spinning and weaving. The pretreated outer flame-retardant fibers and inner comfort fibers are spun into yarns, and then woven into outer and inner fabrics by a loom. Step 3: Flame retardant treatment, the outer layer of the woven fabric is impregnated with flame retardant using a padding device; Step 4: Adhesive preparation, mixing polyurethane resin, acrylate emulsion, flame retardant additive and crosslinking agent to prepare adhesive; Step 5: Lamination and bonding. The flame-retardant outer and inner fabrics are evenly coated with adhesive using a coating equipment, and then laminated and cured in a hot press to obtain a double-layer flame-retardant fabric. In step three, the impregnation solution for the flame retardant impregnation treatment is made from the following raw materials in parts by weight: 45 parts of nitrogen-phosphorus flame retardant, 13 parts of organosilicon synergist, 35 parts of water and 8 parts of dispersant; In step five, the temperature of the hot press during lamination curing is set to 135℃, the pressure is set to 7MPa, and the curing time is 1.5 hours.

[0031] Step one, fiber pretreatment, includes the following steps: The outer flame-retardant fiber and the inner comfort fiber were soaked in degreasing solution for 1.5 hours at room temperature. During the soaking process, the fibers were stirred at 150 r / min. After soaking, the fibers were removed, rinsed with running water for 13 minutes, and then dried at 70°C until the moisture content was less than 5%.

[0032] The degreasing solution consists of ethanol and a surfactant in a mass ratio of 8:1. The ethanol concentration is 95%, and the surfactant is alkylphenol polyoxyethylene ether.

[0033] Step two, the spinning and weaving process, includes the following steps: The pretreated fibers are spun into yarn using a ring spinning machine with a yarn count of 50 English count. The yarn is then woven in a plain weave using a rapier loom with a weaving speed of 500 r / min.

[0034] Step 3, the flame retardant impregnation treatment, includes the following steps: immerse the outer fabric in the impregnation solution and let it stand at room temperature for 45 minutes. During the impregnation process, start the shaker every 15 minutes to shake at 75 times / minute for 5 minutes. After the impregnation is completed, take it out, pre-dry it at 90°C for 15 minutes, and then bake it at 165°C for 8 minutes.

[0035] Step four involves the following steps in preparing the adhesive: Polyurethane resin and acrylate emulsion were added to a mixing device, the temperature was controlled at 30°C, and the mixture was stirred at 400 r / min for 18 minutes. Then, flame retardant additives and crosslinking agents were added, the speed was increased to 900 r / min, and the mixture was stirred for 30 minutes to form a uniform adhesive.

[0036] Step five, lamination, includes the following steps: The adhesive is applied between the outer and inner fabric layers at a coating amount of 25 g / m², and then fed into a hot press for lamination at a set temperature and pressure. After lamination, the fabric is allowed to cool naturally to room temperature and then wound up and packaged.

[0037] A double-layer flame-retardant fabric includes an outer layer and an inner layer, the outer layer being woven from flame-retardant fibers and the inner layer being woven from comfort fibers, the outer layer and the inner layer being laminated together by an adhesive. The outer flame-retardant fiber has a fineness of 2.0 denier, and the inner comfort fiber has a fineness of 1.4 denier. The outer layer is 0.45mm thick, the inner layer is 0.3mm thick, and the total fabric thickness is 0.75mm. The adhesive is made from the following raw materials in parts by weight: 55 parts polyurethane resin, 25 parts acrylic emulsion, 13 parts flame retardant additive, and 8 parts crosslinking agent; Flame-retardant fibers are selected from aramid fibers, and comfort fibers are selected from cotton fibers.

[0038] The outer flame-retardant fiber has a weave density of 200 threads / inch, and the inner comfort fiber has a weave density of 175 threads / inch. The adhesive layer thickness is 0.10 mm, and the fabric unit area mass is 200 g / m². 2 .

[0039] The flame retardant additive is nano-sized aluminum hydroxide, and the crosslinking agent is an isocyanate crosslinking agent.

[0040] Example 3: A manufacturing process for a double-layer flame-retardant fabric, characterized by the following steps: Step 1: Fiber pretreatment. Select the outer flame-retardant fiber and the inner comfort fiber, and perform degreasing, washing and drying treatments respectively. Step 2: Spinning and weaving. The pretreated outer flame-retardant fibers and inner comfort fibers are spun into yarns, and then woven into outer and inner fabrics by a loom. Step 3: Flame retardant treatment, the outer layer of the woven fabric is impregnated with flame retardant using a padding device; Step 4: Adhesive preparation, mixing polyurethane resin, acrylate emulsion, flame retardant additive and crosslinking agent to prepare adhesive; Step 5: Lamination and bonding. The flame-retardant outer and inner fabrics are evenly coated with adhesive using a coating equipment, and then laminated and cured in a hot press to obtain a double-layer flame-retardant fabric. In step three, the impregnation solution for the flame retardant impregnation treatment is made from the following raw materials in parts by weight: 50 parts of nitrogen-phosphorus flame retardant, 15 parts of organosilicon synergist, 40 parts of water and 10 parts of dispersant; In step five, the temperature of the hot press during lamination curing is set to 150℃, the pressure is set to 8MPa, and the curing time is 2 hours.

[0041] Step one, fiber pretreatment, includes the following steps: The outer flame-retardant fiber and the inner comfort fiber were soaked in degreasing solution for 2 hours at room temperature. During the soaking process, the fibers were stirred at 200 r / min. After soaking, the fibers were removed, rinsed with running water for 15 minutes, and then dried at 80℃ until the moisture content was less than 5%.

[0042] The degreasing solution consists of ethanol and a surfactant in a mass ratio of 8:1. The ethanol concentration is 95%, and the surfactant is alkylphenol polyoxyethylene ether.

[0043] Step two, the spinning and weaving process, includes the following steps: The pretreated fibers were spun into yarn using a ring spinning machine with a yarn count of 60 English count. The yarn was then woven in a plain weave using a rapier loom with a weaving speed of 600 r / min.

[0044] Step 3, the flame retardant impregnation treatment, includes the following steps: immerse the outer fabric in the impregnation solution and let it stand at room temperature for 60 minutes. During the impregnation process, start the shaker every 15 minutes to shake at 100 times / minute for 5 minutes. After the impregnation is completed, take it out, pre-dry it at 100℃ for 20 minutes, and then bake it at 180℃ for 10 minutes.

[0045] Step four involves the following steps in preparing the adhesive: Polyurethane resin and acrylate emulsion are added to a mixing device, the temperature is controlled at 35℃, and the mixture is stirred at 500 r / min for 20 minutes. Then, flame retardant additives and crosslinking agents are added, the speed is increased to 1000 r / min, and the mixture is stirred for 35 minutes to form a uniform adhesive.

[0046] Step five, lamination, includes the following steps: The adhesive is applied between the outer and inner fabric layers at a coating amount of 30 g / m², and then fed into a hot press for lamination at a set temperature and pressure. After lamination, the fabric is allowed to cool naturally to room temperature and then wound up and packaged.

[0047] A double-layer flame-retardant fabric includes an outer layer and an inner layer, the outer layer being woven from flame-retardant fibers and the inner layer being woven from comfort fibers, the outer layer and the inner layer being laminated together by an adhesive. The outer flame-retardant fiber has a fineness of 2.5 denier, and the inner comfort fiber has a fineness of 1.8 denier. The outer layer is 0.6mm thick, the inner layer is 0.4mm thick, and the total fabric thickness is 1.0mm. The adhesive is made from the following raw materials in parts by weight: 60 parts polyurethane resin, 30 parts acrylic emulsion, 15 parts flame retardant additive, and 10 parts crosslinking agent; Flame-retardant fibers are selected from aramid fibers, and comfort fibers are selected from cotton fibers.

[0048] The outer flame-retardant fiber has a weave density of 220 threads / inch, and the inner comfort fiber has a weave density of 200 threads / inch. The adhesive layer thickness is 0.15mm, and the fabric unit area mass is 250g / m². 2 .

[0049] The flame retardant additive is nano-sized aluminum hydroxide, and the crosslinking agent is an isocyanate crosslinking agent.

[0050] Comparative Example 1: The difference between this comparative example and Example 1 is that no organosilicon synergist was added when preparing the impregnation solution in this comparative example.

[0051] Comparative Example 2 differs from Example 1 in that no nitrogen-phosphorus flame retardant was added when preparing the impregnation solution in this comparative example.

[0052] Comparative Example 3 differs from Example 1 in that the outer fabric of this comparative example was not treated with flame retardant.

[0053] Comparative Example 4 differs from Example 1 in that no surfactant was added during the preparation of the degreasing solution in this comparative example.

[0054] The performance of the double-layer flame-retardant fabrics prepared in Examples 1-3 and Comparative Examples 1-4 was tested. The test items and test methods are as follows: For flame retardancy testing, in a nitrogen-oxygen mixture with an initial oxygen concentration of 21%, the oxygen concentration is adjusted until the sample can burn continuously for 3 minutes or 50 mm in length, and the oxygen index is calculated. For the water absorption test, the sample was soaked in distilled water for 24 hours at room temperature of 25°C. After drying and weighing, the sample was soaked in water again, removed and the surface moisture was wiped off. The percentage increase in mass was then calculated. Strength testing was conducted using a universal testing machine. The adhesive strength test was conducted using the peel strength test.

[0055] The test data of the double-layer flame-retardant fabrics prepared in Examples 1-3 and Comparative Examples 1-4 are recorded in the table below:

[0056] By comparing and analyzing the data in the table, it can be seen that the double-layer flame-retardant fabric prepared using the processes in Examples 1-3 has significantly better performance than the double-layer flame-retardant fabric prepared using the processes in Comparative Examples 1-4. This indicates that in the production of the double-layer flame-retardant fabric, the present invention, through the use of a double-layer structure design of an outer layer of flame-retardant fibers and an inner layer of comfort fibers, combined with flame retardant impregnation treatment, enables the fabric to possess both good flame retardancy and comfort, ensuring the safety and wearing experience of the fabric during use and expanding its application range. In the fiber pretreatment and adhesive preparation, the surface state of the fibers is optimized through degreasing, washing, and drying treatments, and an adhesive is prepared by mixing polyurethane resin, acrylic emulsion, flame retardant additives, and crosslinking agents to enhance the bonding force between the outer and inner fabrics, improve the interlayer bonding strength and durability of the fabric, and avoid delamination problems. In the lamination process, by controlling the temperature, pressure, and time parameters of the hot press, the adhesive is cured uniformly, achieving overall structural stability and performance consistency of the fabric, improving the overall quality and reliability of the double-layer flame-retardant fabric, and ensuring the long-term effectiveness of the flame-retardant effect.

[0057] By comparing and analyzing the relevant data in the table, it can be seen that the double-layer flame-retardant fabric prepared by the molding process of this invention has good flame retardancy, water resistance and interlayer bonding strength.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for a double-layer flame-retardant fabric, characterized in that: Includes the following steps: Step 1: Fiber pretreatment. Select the outer flame-retardant fiber and the inner comfort fiber, and perform degreasing, washing and drying treatments respectively. Step 2: Spinning and weaving. The pretreated outer flame-retardant fibers and inner comfort fibers are spun into yarns, and then woven into outer and inner fabrics by a loom. Step 3: Flame retardant treatment, the outer layer of the woven fabric is impregnated with flame retardant using a padding device; Step 4: Adhesive preparation, mixing polyurethane resin, acrylate emulsion, flame retardant additive and crosslinking agent to prepare adhesive; Step 5: Lamination and bonding. The flame-retardant outer and inner fabrics are evenly coated with adhesive using a coating equipment, and then laminated and cured in a hot press to obtain a double-layer flame-retardant fabric. In step three, the impregnation solution for flame retardant impregnation treatment is made from the following raw materials in parts by weight: 40-50 parts of nitrogen-phosphorus flame retardant, 10-15 parts of organosilicon synergist, 30-40 parts of water, and 5-10 parts of dispersant. In step five, the temperature of the hot press during lamination curing is set to 120-150℃, the pressure is set to 5-8MPa, and the curing time is 1-2 hours.

2. The manufacturing process of a double-layer flame-retardant fabric according to claim 1, characterized in that: The fiber pretreatment in step one includes the following steps: The outer flame-retardant fiber and the inner comfort fiber are soaked separately in degreasing solution for 1-2 hours at room temperature. During the soaking process, the fibers are stirred at 100-200 r / min. After soaking, the fibers are removed, rinsed with running water for 10-15 minutes, and then dried at 60-80℃ until the moisture content is less than 5%.

3. The manufacturing process of a double-layer flame-retardant fabric according to claim 2, characterized in that: The degreasing solution is composed of ethanol and a surfactant, wherein the mass ratio of ethanol to surfactant is 8:1, the concentration of ethanol is 95%, and the surfactant is one of alkylphenol polyoxyethylene ether or fatty acid glyceride.

4. The manufacturing process of a double-layer flame-retardant fabric according to claim 1, characterized in that: Step two, the spinning and weaving process, includes the following steps: The pretreated fibers are spun into yarn using a ring spinning machine with a yarn count of 40-60 English count. The yarn is then woven in a plain weave using a rapier loom with a weaving speed of 400-600 r / min.

5. The manufacturing process of a double-layer flame-retardant fabric according to claim 1, characterized in that: The flame retardant impregnation treatment in step three includes the following steps: immersing the outer fabric in the impregnation solution and letting it stand at room temperature for 30-60 minutes. During the impregnation process, the oscillator is started every 15 minutes to oscillate at 50-100 times / minute for 5 minutes. After the impregnation is completed, the fabric is taken out and pre-dried at 80-100℃ for 10-20 minutes, and then baked at 150-180℃ for 5-10 minutes.

6. The manufacturing process of a double-layer flame-retardant fabric according to claim 1, characterized in that: The adhesive preparation in step four includes the following steps: Polyurethane resin and acrylate emulsion are added to a mixing device, the temperature is controlled at 25-35℃, and the mixture is stirred at 300-500 r / min for 15-20 minutes. Then, flame retardant additives and crosslinking agents are added, the speed is increased to 800-1000 r / min, and the mixture is stirred for 25-35 minutes to form a uniform adhesive.

7. The manufacturing process of a double-layer flame-retardant fabric according to claim 1, characterized in that: Step five, lamination, includes the following steps: The adhesive is applied between the outer and inner fabric layers at a coating amount of 20-30 g / m², and then fed into a hot press for lamination at a set temperature and pressure. After lamination, the fabric is allowed to cool naturally to room temperature and then wound up and packaged.

8. A double-layer flame-retardant fabric, prepared by the manufacturing process of a double-layer flame-retardant fabric according to any one of claims 1-7, characterized in that: It includes an outer layer and an inner layer, the outer layer being woven from flame-retardant fibers and the inner layer being woven from comfort fibers, the outer layer and the inner layer being laminated together by an adhesive; The outer flame-retardant fiber has a fineness of 1.5-2.5 denier, and the inner comfort fiber has a fineness of 1.0-1.8 denier. The outer layer has a thickness of 0.3-0.6 mm, the inner layer has a thickness of 0.2-0.4 mm, and the total fabric thickness is 0.5-1.0 mm. The adhesive is made from the following raw materials in parts by weight: 50-60 parts polyurethane resin, 20-30 parts acrylic emulsion, 10-15 parts flame retardant additive, and 5-10 parts crosslinking agent. The flame-retardant fiber is selected from at least one of aramid fiber, flame-retardant polyester fiber, or flame-retardant cotton fiber, and the comfort fiber is selected from at least one of cotton fiber, modal fiber, or bamboo fiber.

9. The double-layer flame-retardant fabric and its manufacturing process according to claim 8, characterized in that: The outer flame-retardant fiber has a weaving density of 180-220 threads / inch, and the inner comfort fiber has a weaving density of 150-200 threads / inch. The adhesive layer has a thickness of 0.05-0.15 mm, and the fabric has a unit area mass of 150-250 g / m². 2 .

10. The double-layer flame-retardant fabric and its manufacturing process according to claim 8, characterized in that: The flame retardant additive is at least one of nano-sized aluminum hydroxide, zinc borate, or antimony trioxide, and the crosslinking agent is one of isocyanate crosslinking agents or epoxy crosslinking agents.

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