Flame retardant, preparation method and application thereof, and preparation method of flame-retardant textile fabric
The synthesis of nitrogen-containing heterocyclic phosphate flame retardants via an aqueous phase method solves the problems of environmental pollution and poor performance of traditional flame retardants in textiles, achieving high efficiency, environmental protection, and durability, thus broadening the application range.
Patent Information
- Application Number
- CN202511670642.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-02-06
AI Technical Summary
Traditional flame retardants have problems such as environmental pollution, high production costs, poor performance and impact on physical properties when used in textiles, making it difficult to meet the requirements of green and environmentally friendly applications.
Nitrogen-containing heterocyclic phosphate flame retardants were synthesized using an aqueous phase method. Through Schiff base condensation reaction and catalyst treatment, an organic solvent-free flame retardant was prepared and then uniformly penetrated into the textile fabric through roll pressing curing treatment.
It has achieved the synthesis of green and environmentally friendly flame retardants, which improves the flame retardant properties and durability of textiles, reduces production costs, and does not affect the physical properties of textiles.
Smart Images
Figure CN121471264A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of flame retardant materials technology, and in particular to a flame retardant, its preparation method and application, and a method for preparing flame retardant textiles. Background Technology
[0002] In the textile industry, flame retardant finishing is a crucial technology that directly affects the safety performance of textiles and plays an irreplaceable role in reducing fire accidents. However, current traditional flame retardants have revealed many problems that urgently need to be solved during application, which seriously restrict the further development and application of flame retardant technology in the textile field.
[0003] The synthesis of traditional flame retardants typically relies on organic solvents. The use of organic solvents not only increases production costs but also causes serious environmental pollution. During production, organic solvents evaporate into the air, forming volatile organic compounds (VOCs). These compounds not only pollute the atmosphere but may also have adverse effects on human health. Operators exposed to these organic solvents may experience respiratory irritation, skin allergies, and long-term exposure may lead to more serious health problems. More importantly, traditional flame retardants are ineffective when treating difficult-to-impregnate textiles. These textiles typically have a dense fiber structure and low surface energy, making it difficult for flame retardants to penetrate evenly, resulting in unsatisfactory flame-retardant effects. Even after flame-retardant treatment, these textiles may still ignite rapidly when exposed to a source of ignition, failing to achieve the desired flame-retardant effect. Furthermore, the application of traditional flame retardants can affect the physical properties and appearance of textiles, such as reducing strength and elasticity, altering color and feel, thus limiting the market application of flame-retardant textiles.
[0004] Furthermore, with the increasing environmental awareness of the public, the demand for green and environmentally friendly products is growing. Traditional methods of synthesizing and using flame retardants can no longer meet this market demand, making the development of a green and environmentally friendly flame retardant synthesis method an urgent priority. Summary of the Invention
[0005] In view of this, the present invention provides a flame retardant, its preparation method and application, and a method for preparing flame-retardant textiles. The preparation method of the flame retardant of the present invention is carried out in an aqueous phase without the use of organic solvents. This method synthesizes nitrogen-containing heterocyclic phosphate flame retardants in an organic solvent-free environment, fundamentally solving the environmental pollution problems of traditional flame retardant synthesis processes and achieving green environmental protection. The synthesized flame retardant is particularly suitable for difficult-to-impregnate textiles, effectively solving the problem of poor application of traditional flame retardants on difficult-to-treat fabrics. It can uniformly penetrate into the interior of the textile, tightly binding with the fibers, thereby significantly improving the flame retardant properties of the textile. It retains its flame retardant properties even after multiple washes, giving it a long service life in fabric finishing.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] In a first aspect, the present invention provides a method for preparing a flame retardant, comprising the following steps:
[0008] Ethylenediamine and glyoxal are added to water to carry out a Schiff base condensation reaction;
[0009] After the Schiff base condensation reaction is completed, an aqueous solution of aluminum dihydrogen phosphate is added and stirred, followed by the addition of a catalyst to continue the reaction and obtain a flame retardant.
[0010] Preferably, the catalyst includes at least one of phosphorus pentoxide, hydrochloric acid, and p-toluenesulfonic acid.
[0011] Preferably, in the step of carrying out the Schiff base condensation reaction, the reaction temperature is 30~60℃ and the reaction time is 3~24h.
[0012] Preferably, after the Schiff base condensation reaction is completed, an aqueous solution of aluminum dihydrogen phosphate is added and stirred, followed by the addition of a catalyst. The reaction is carried out at a temperature of 150~250℃ for 3~10 hours, and the water is removed by vacuum distillation to obtain the flame retardant.
[0013] Preferably, in the step of adding ethylenediamine and glyoxal to water, the mass ratio of ethylenediamine to glyoxal is (2~3):1, and the mass ratio of ethylenediamine to water is (1~2):(1~2).
[0014] The mass fraction of the aluminum dihydrogen phosphate aqueous solution is 50-55%;
[0015] The mass ratio of the aluminum dihydrogen phosphate aqueous solution to ethylenediamine is (1.5~4):1;
[0016] The mass ratio of the catalyst to ethylenediamine is (0.2~0.3):(1~2).
[0017] Secondly, the present invention also provides a flame retardant prepared by the aforementioned preparation method.
[0018] Thirdly, the present invention also provides a flame retardant prepared by the preparation method described above, or the application of the flame retardant described above in the preparation of flame retardant textiles.
[0019] Fourthly, the present invention also provides a method for preparing flame-retardant textiles, comprising the following steps:
[0020] The flame retardant is dispersed in water to obtain an impregnation solution;
[0021] After impregnating the textile with a liquid, it is then subjected to a roll-pressing curing process to obtain a flame-retardant textile.
[0022] Preferably, in the step of immersing the textile in the impregnation solution, the immersion temperature is 80~85℃ and the immersion time is 1~2 minutes; the mass fraction of the impregnation solution is 10~25%.
[0023] Preferably, during the roll pressing curing process, the roll pressing pressure is 15~16 MPa, the temperature is 120~220℃, and the time is 5~40s.
[0024] The flame retardant, its preparation method, and its application, as well as the method for preparing flame-retardant textiles of the present invention, have the following advantages over the prior art:
[0025] The method for preparing the flame retardant of this invention synthesizes a nitrogen-containing heterocyclic phosphate flame retardant in an environment without organic solvents. This innovative method not only reduces environmental pollution but also improves production efficiency and lowers costs. Furthermore, the nitrogen-containing heterocyclic phosphate flame retardant itself possesses highly efficient flame-retardant properties, capable of forming a stable flame-retardant layer on the material surface through adsorption. Specifically, the nitrogen and phosphorus atoms in the nitrogen-containing heterocyclic phosphate molecule carry polar groups, which can form hydrogen bonds or dipole-dipole interactions with polar groups such as hydroxyl or carboxyl groups on the polyester material surface. This chemisorption allows the nitrogen-containing heterocyclic phosphate ester to firmly adhere to the polyester surface, thereby enhancing the bonding force between the two. During the fabric combustion process, the principle of coordinated phosphorus and nitrogen flame retardancy is utilized to achieve highly efficient flame retardancy. More importantly, the synthesis of a six-membered ring structure from glyoxal and ethylenediamine exhibits better heat resistance, is less prone to decomposition or migration, and produces less smoke and toxic gases during combustion, meeting environmental protection requirements. In addition, hexacyclic phosphates have good water resistance and washability, and can maintain their flame retardant properties after multiple washes, which gives them a long service life in fabric finishing. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a scanning electron microscope image of the flame retardant prepared in Example 1. Detailed Implementation
[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
[0029] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single digits within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any referenced number (fraction or integer) within the indicated range.
[0030] This application provides a method for preparing a flame retardant, comprising the following steps:
[0031] Ethylenediamine and glyoxal are added to water to carry out a Schiff base condensation reaction;
[0032] After the Schiff base condensation reaction is completed, an aqueous solution of aluminum dihydrogen phosphate is added and stirred, followed by the addition of a catalyst to continue the reaction and obtain a flame retardant.
[0033] The preparation method of the flame retardant of this invention consists of three reaction steps. First, ethylenediamine and glyoxal are condensed to form an imine (-C=N-) precursor. Second, this precursor is further condensed to form an amino six-membered ring derivative. Finally, a phosphorus source is added, and cyclic phosphate esters are gradually formed during the catalyst and dehydration process. Specifically, ethylenediamine and glyoxal first condense in water to form the imine (-C=N-) precursor, as shown in the following reaction formula:
[0034] ;
[0035] The imine (-C=N-) precursor condenses to form an amino six-membered ring derivative (piperazine-2,5-dione (six-membered ring), i.e., Schiff base condensation reaction to form an amino six-membered ring derivative), as shown in the following reaction formula:
[0036] ;
[0037] After the Schiff base condensation reaction is complete, an aqueous solution of aluminum dihydrogen phosphate is added and stirred, followed by the addition of a catalyst to continue the reaction, yielding an organic cyclic phosphate flame retardant. The reaction formula is as follows:
[0038] .
[0039] The method for preparing the flame retardant of this invention synthesizes a nitrogen-containing heterocyclic phosphate flame retardant in an environment without organic solvents. This innovative method not only reduces environmental pollution but also improves production efficiency and lowers costs. Furthermore, the nitrogen-containing heterocyclic phosphate flame retardant itself possesses highly efficient flame-retardant properties, capable of forming a stable flame-retardant layer on the material surface through adsorption. Specifically, the nitrogen and phosphorus atoms in the nitrogen-containing heterocyclic phosphate molecule carry polar groups, which can form hydrogen bonds or dipole-dipole interactions with polar groups such as hydroxyl or carboxyl groups on the polyester material surface. This chemisorption allows the nitrogen-containing heterocyclic phosphate ester to firmly adhere to the polyester surface, thereby enhancing the bonding force between the two. During the fabric combustion process, the principle of coordinated phosphorus and nitrogen flame retardancy is utilized to achieve highly efficient flame retardancy. More importantly, the synthesis of a six-membered ring structure from glyoxal and ethylenediamine exhibits better heat resistance, is less prone to decomposition or migration, and produces less smoke and toxic gases during combustion, meeting environmental protection requirements. In addition, hexacyclic phosphates have good water resistance and washability, and can maintain their flame retardant properties after multiple washes, which gives them a long service life in fabric finishing.
[0040] The synthesis method of the flame retardant of this invention is carried out in an aqueous phase, eliminating the need for organic solvents and fundamentally solving the environmental pollution problems associated with traditional flame retardant synthesis processes, thus achieving green and environmentally friendly production. The synthesized flame retardant is particularly suitable for difficult-to-impregnate textiles, effectively addressing the problem of poor application of traditional flame retardants on challenging fabrics. It can uniformly penetrate the interior of the textile, tightly binding with the fibers, thereby significantly improving the flame retardant properties of the textile without adversely affecting its physical properties or appearance. This innovation not only broadens the application range of high-efficiency flame retardants but also provides new impetus and direction for the sustainable development of the textile industry, and is expected to occupy an important position in the future market.
[0041] In some embodiments, the catalyst includes at least one of phosphorus pentoxide, hydrochloric acid, and p-toluenesulfonic acid (chemical formula C7H8O3S).
[0042] In some embodiments, the Schiff base condensation reaction is carried out at a temperature of 30-60°C for 3-24 hours.
[0043] In some embodiments, after the Schiff base condensation reaction is completed, an aqueous solution of aluminum dihydrogen phosphate is added and stirred, followed by the addition of a catalyst. The reaction is carried out at a temperature of 150~250℃ for 3~10 hours, and the water is removed by vacuum distillation to obtain the flame retardant.
[0044] In some embodiments, in the step of adding ethylenediamine and glyoxal to water, the mass ratio of ethylenediamine to glyoxal is (2~3):1, and the mass ratio of ethylenediamine to water is (1~2):(1~2).
[0045] In some embodiments, the mass fraction of the aqueous solution of aluminum dihydrogen phosphate is 50-55%.
[0046] In some embodiments, the mass ratio of aluminum dihydrogen phosphate aqueous solution to ethylenediamine is (1.5~4):1.
[0047] In some embodiments, the mass ratio of catalyst to ethylenediamine is (0.2~0.3):(1~2).
[0048] In some embodiments, the mass fraction of the aqueous solution of aluminum dihydrogen phosphate is 50-55%.
[0049] In some embodiments, the mass ratio of aluminum dihydrogen phosphate aqueous solution to ethylenediamine is (1.5~4):1.
[0050] In some embodiments, the mass ratio of catalyst to ethylenediamine is (0.2~0.3):(1~2).
[0051] In some embodiments, the mass ratio of ethylenediamine, glyoxal, water, aluminum dihydrogen phosphate aqueous solution, and catalyst is (1.2~1.5):0.58:1:(4.2~4.8):0.2.
[0052] In some embodiments, the reduced pressure distillation pressure is -0.09 to -0.05 MPa. Specifically, the reduced pressure is gradually increased from -0.05 MPa to -0.09 MPa to prevent the liquid from boiling over until no water evaporates. The molten material is then discharged through a pipeline. (If powdered flame retardant is required, it can be dried in a high-temperature oven at 220°C and then pulverized.) The flame retardant is then obtained.
[0053] Based on the same inventive concept, the present invention also provides a flame retardant prepared by the above-described preparation method.
[0054] Based on the same inventive concept, the present invention also provides a flame retardant prepared by the above-described preparation method or the application of the above-described flame retardant in the preparation of flame-retardant textiles.
[0055] The application of the flame retardant of this invention in flame-retardant finishing of textiles differs from traditional flame-retardant liquid treatments in that the adsorption characteristics of nitrogen-containing heterocyclic phosphates are of great significance in the field of material modification. For example, by adsorbing onto the polyester surface, it can significantly improve the flame-retardant properties of the material, which has wide applications in textiles, plastics, and packaging materials. This green synthesis method not only avoids the use of organic solvents and reduces environmental pollution, but also improves production efficiency, providing a new approach for the sustainable development of the chemical industry.
[0056] Based on the same inventive concept, the present invention also provides a method for preparing flame-retardant textiles, comprising the following steps:
[0057] S1. Disperse the flame retardant in water to obtain an impregnation solution;
[0058] S2. After impregnating the textile with the impregnation liquid, the textile is then subjected to roller pressing and curing treatment to obtain flame-retardant textile.
[0059] In some embodiments, in the step of immersing the textile in the impregnation solution, the immersion temperature is 80-85°C and the immersion time is 1-2 minutes; the mass fraction of the impregnation solution is 10-25%.
[0060] In some embodiments, during the roll pressing curing process, the roll pressing pressure is 15~16 MPa, the temperature is 120~220°C, and the time is 5~40 s.
[0061] In some embodiments, textiles include cotton fabrics, synthetic fibers (nylon (PA), PET and other polyester materials), polypropylene, etc.
[0062] In some embodiments, the textile is passed through the impregnation liquid at a speed of 10-50 m / min, then the excess flame retardant liquid is crushed by a pressure roller, and then cured by a hot roller (which has both "heating" and "pressurizing" functions) at a curing temperature of 120-220°C to obtain a flame retardant textile.
[0063] The following specific embodiments further illustrate the flame retardant of this application, its preparation method and application, and the preparation method of flame-retardant textiles. This section further illustrates the content of the present invention in conjunction with specific embodiments, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.
[0064] Example 1
[0065] This embodiment provides a method for preparing a flame retardant, including the following steps:
[0066] S1. Add 1.2 kg of ethylenediamine and 0.58 kg of glyoxal to 1 L of water and allow Schiff base condensation to occur at 45 °C for 10 h.
[0067] After the S2 Schiff base condensation reaction is completed, 4.2 kg of aluminum dihydrogen phosphate aqueous solution (mass fraction of 50%) is added and stirred, followed by 0.2 kg of p-toluenesulfonic acid. The mixture is reacted at 150 °C for 5 h. The water is removed by vacuum distillation, dried, and pulverized to obtain the flame retardant.
[0068] This embodiment also provides a method for preparing flame-retardant textiles, including the following steps:
[0069] S1. Add 3.1 kg of the flame retardant prepared in Example 1 to 12 kg of water and stir at 90°C for 10 h to form a homogeneous solution to obtain the impregnation liquid;
[0070] S2. PET, PA and cotton textiles are immersed in the impregnation solution in S1 at 80°C for 1 minute, and then cured by roller pressing at 15 MPa and 210°C for 15 seconds to obtain flame-retardant textiles.
[0071] Example 2
[0072] This embodiment provides a method for preparing a flame retardant, including the following steps:
[0073] S1. Add 1.5 kg of ethylenediamine and 0.58 kg of glyoxal to 1 L of water and allow Schiff base condensation to occur at 45 °C for 10 h.
[0074] After the S2 Schiff base condensation reaction is completed, 4.8 kg of aluminum dihydrogen phosphate aqueous solution (mass fraction of 50%) is added and stirred, followed by 0.2 kg of p-toluenesulfonic acid. The reaction is carried out at 200℃ for 3 h. The water is removed by vacuum distillation, dried, and pulverized to obtain the flame retardant.
[0075] This embodiment also provides a method for preparing flame-retardant textiles, including the following steps:
[0076] S1. Add 2.8 kg of the flame retardant prepared in Example 2 to 12 kg of water, stir at 90°C for 10 h to form a homogeneous solution, and obtain the impregnation liquid;
[0077] S2. PET, PA and cotton textiles are respectively immersed in the impregnation solution in S1 at 80°C for 1 minute, and then subjected to roller pressing curing treatment at a roller pressing pressure of 15 MPa and a temperature of 200°C for 20 seconds to obtain flame-retardant textiles.
[0078] Example 3
[0079] This embodiment provides a method for preparing a flame retardant, including the following steps:
[0080] S1. Add 1.3 kg of ethylenediamine and 0.58 kg of glyoxal to 1 L of water and allow Schiff base condensation to occur at 45 °C for 10 h.
[0081] After the S2 Schiff base condensation reaction is completed, 4.8 kg of aluminum dihydrogen phosphate aqueous solution (mass fraction of 50%) is added and stirred, followed by 0.2 kg of phosphorus pentoxide. The reaction is carried out at 150℃ for 10 h. The water is removed by vacuum distillation, dried, and pulverized to obtain the flame retardant.
[0082] This embodiment also provides a method for preparing flame-retardant textiles, including the following steps:
[0083] S1. Add 4 kg of the flame retardant prepared in Example 3 to 12 kg of water and stir at 90°C for 10 h to form a homogeneous solution to obtain the impregnation liquid;
[0084] S2. PET, PA and cotton textiles are respectively immersed in the impregnation solution in S1 at 80°C for 1 minute, and then subjected to roller pressing curing treatment at a roller pressing pressure of 15 MPa and a temperature of 220°C for 15 seconds to obtain flame-retardant textiles.
[0085] Performance testing
[0086] Figure 1 This is a scanning electron microscope image of the flame retardant prepared in Example 1.
[0087] from Figure 1As can be seen, the flame retardant synthesized through Example 1 has a uniform particle size of about 500 nm. On the one hand, the nano-sized flame retardant has higher surface activity and can be firmly adsorbed on the surface of the substrate, thus achieving a water-resistant effect. On the other hand, the nano-sized flame retardant can coat the substrate more evenly, thus achieving a better flame retardant effect.
[0088] The combustion performance and wash resistance of the flame-retardant textiles prepared in Examples 1-3 were tested, and the results are shown in Table 1 below:
[0089] Table 1 - Combustion performance and wash resistance of the flame-retardant textiles prepared in Examples 1-3
[0090]
[0091] In Table 1, the burning performance test standard refers to GB / T 5455-2014 "Determination of vertical damage length, smoldering and afterflame time of textiles"; the water resistance test refers to GB / T 17596-2019 "Determination of dimensional changes of textile fabrics during household washing and drying".
[0092] As shown in Table 1, the flame retardant of this invention is suitable for PET, PA, and cotton materials. The resulting flame-retardant textiles have an afterflame time of 1-5s, a smoldering time of 1-3s, a damaged length of 30-60mm, and a wash resistance of 51-68 times, demonstrating excellent flame retardant and wash resistance properties. Among the three materials, cotton has the best overall performance (afterflame time of 1-2s, smoldering time of 1-2s, damaged length of 30-41mm, and wash resistance of 62-68 times), while PET and PA materials both meet excellent standards. Meanwhile, Example 3 has the best overall performance, with leading flame retardant indicators (afterflame time of 1-4s, smoldering time of 1-2s, damaged length of 30-46mm) and wash resistance (59-68 times) for each material.
[0093] It is understood that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0094] The above are merely preferred embodiments of this application, and only specifically describe the technical principles of this application. These descriptions are only for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, as well as other specific embodiments of this application that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of this application.
Claims
1. A method for preparing a flame retardant, characterized in that, Includes the following steps: Ethylenediamine and glyoxal are added to water to carry out a Schiff base condensation reaction; After the Schiff base condensation reaction is completed, an aqueous solution of aluminum dihydrogen phosphate is added and stirred, followed by the addition of a catalyst to continue the reaction and obtain a flame retardant.
2. The method for preparing the flame retardant as described in claim 1, characterized in that, The catalyst includes at least one of phosphorus pentoxide, hydrochloric acid, and p-toluenesulfonic acid.
3. The method for preparing the flame retardant as described in claim 1, characterized in that, In the Schiff base condensation reaction, the reaction temperature is 30~60℃ and the reaction time is 3~24h.
4. The method for preparing the flame retardant as described in claim 1, characterized in that, After the Schiff base condensation reaction is completed, an aqueous solution of aluminum dihydrogen phosphate is added and stirred, followed by the addition of a catalyst. The reaction is carried out at a temperature of 150~250℃ for 3~10 hours. The water is removed by vacuum distillation to obtain the flame retardant.
5. The method for preparing the flame retardant as described in claim 1, characterized in that, In the step of adding ethylenediamine and glyoxal to water, the mass ratio of ethylenediamine to glyoxal is (2~3):1, and the mass ratio of ethylenediamine to water is (1~2):(1~2). The mass fraction of the aluminum dihydrogen phosphate aqueous solution is 50-55%; The mass ratio of the aluminum dihydrogen phosphate aqueous solution to ethylenediamine is (1.5~4):1; The mass ratio of the catalyst to ethylenediamine is (0.2~0.3):(1~2).
6. A flame retardant, characterized in that, It is prepared by any one of the preparation methods described in claims 1 to 5.
7. The application of a flame retardant prepared by any one of the preparation methods described in claims 1 to 5 or the flame retardant described in claim 6 in the preparation of flame-retardant textiles.
8. A method for preparing a flame-retardant textile, characterized in that, Includes the following steps: The flame retardant of claim 6 is dispersed in water to obtain an impregnation solution; After immersing the textile in an impregnation solution, it undergoes a roll-pressing curing process to obtain a flame-retardant textile.
9. The method for preparing flame-retardant textiles as described in claim 8, characterized in that, In the step of immersing the textile in the impregnation solution, the immersion temperature is 80~85℃ and the immersion time is 1~2 minutes; the mass fraction of the impregnation solution is 10~25%.
10. The method for preparing flame-retardant textiles as described in claim 8, characterized in that, During the roll pressing curing process, the roll pressing pressure is 15~16 MPa, the temperature is 120~220℃, and the time is 5~40 seconds.