Textile coating with flame-retardant and hydrophobic functions and preparation method thereof

Abstract

The invention discloses a textile coating with flame-retardant and hydrophobic functions and a preparation method thereof, and belongs to the technical field of functional textile materials. The method comprises the following steps: firstly, synthesizing a polysiloxane modified waterborne polyurethane emulsion, then preparing a phytic acid-zinc complex flame-retardant solution, and blending and crosslinking the polysiloxane modified waterborne polyurethane emulsion and the phytic acid-zinc complex flame-retardant solution on the surface of the fabric to construct a flame-retardant coating; the finished fabric is soaked in an alcohol / water solution containing hexadecyl trimethoxy silane, a hydrophobic layer is formed through catalytic hydrolytic condensation of the flame-retardant layer, and the fabric with the flame-retardant and hydrophobic functions is obtained. The coated fabric has excellent flame retardance, molten drop resistance, smoke suppression, hydrophobicity and self-cleaning capacity, and meanwhile, good mechanical property and washability are kept. The method is simple in process, environmentally friendly, efficient and suitable for functional finishing of various textiles such as tents, automobile interiors, protective clothing and wall cloth.

Description

Technical Field

[0001] This invention belongs to the field of textile coating technology, specifically, it relates to a textile coating with both flame-retardant and hydrophobic functions and its preparation method. Background Technology

[0002] Functional finishing of textiles is a key means to enhance their added value and expand their application areas. Among them, flame-retardant finishing and hydrophobic finishing are two important functional directions, respectively dedicated to improving the safety performance and user comfort and durability of textiles. With the increasing awareness of safety and environmental protection and the increasingly stringent regulations, the development of multifunctional and environmentally friendly textile finishing technologies has become a research hotspot and an inevitable trend in the industry.

[0003] In flame-retardant finishing, synthetic fibers such as polyester are flammable materials and produce severe dripping during combustion, easily causing secondary fires and personal injury. Traditional halogen-based, phosphorus-halogen synergistic, or antimony- and aluminum-containing flame-retardant systems are effective, but they may release toxic and corrosive gases and fumes during combustion, posing potential environmental and health risks, and their application is being increasingly restricted. Therefore, developing efficient, low-toxicity, and environmentally friendly halogen-free flame-retardant systems is crucial. Phytic acid, as a widely available and renewable bio-based molecule, has excellent catalytic char formation ability and is considered a highly promising green flame retardant. However, when used alone, phytic acid has limited thermal stability, and the char layer it promotes is often not dense and has low strength, resulting in limited flame-retardant efficiency, and it may produce a lot of smoke in the early stages of combustion due to rapid decomposition. To address these issues, researchers often complex phytic acid with metal ions. The resulting phytic acid metal salt can significantly improve thermal stability, promote the formation of a denser and more continuous expanded char layer, and leverage the barrier effect of metal oxides in the condensed phase and the free radical capture effect in the gas phase, thereby improving smoke suppression performance while enhancing flame retardant efficiency.

[0004] In hydrophobic finishing, imparting hydrophobic or even superhydrophobic properties to textiles can give them stain resistance, self-cleaning, and waterproof characteristics, greatly expanding their applications in outdoor equipment, medical protective equipment, and everyday clothing. Common hydrophobic finishing methods include using fluorinated compounds, long-chain alkyl silanes, or constructing rough micro / nano structures. Among these, while fluorinated compounds offer excellent water and oil repellency, they suffer from high costs and potential bioaccumulation controversies. Long-chain alkyl silanes, on the other hand, are favored due to their relative environmental friendliness, lower cost, and high reactivity. They can form a low-surface-energy polysiloxane network on the fabric surface through hydrolysis and condensation, thereby imparting hydrophobicity to the fabric. However, simple silane finishing layers often exhibit poor mechanical durability and wash resistance.

[0005] In achieving both flame retardancy and hydrophobicity, the main challenges faced by existing technologies lie in the contradictions between functions and the compatibility of processes: (1) Functional antagonism: Many highly efficient flame retardants are hydrophilic or hygroscopic, which can seriously damage the hydrophobic properties of fabrics. Conversely, the large amount of alkyl long-chain or organosilicon components introduced to build a stable hydrophobic layer are usually flammable and may reduce the limiting oxygen index of the fabric, weakening the flame retardant effect. (2) Contradiction between coating structure and durability: Simple physical blending of flame retardants and hydrophobic agents may lead to component migration, uneven function, weak interfacial bonding, and poor durability. Although multi-layer coating process (flame retardant first, then hydrophobic) can isolate functional conflicts to a certain extent, if the interlayer relies solely on physical adsorption, the bonding force is weak, and delamination and peeling are likely to occur during friction and washing, leading to rapid functional failure.

[0006] Therefore, developing a simple and environmentally friendly method for preparing a dual-functional textile coating that effectively synergistically combines flame retardancy and hydrophobicity, enhances coating cohesion and fabric bonding through chemical bonding, and is of significant practical importance for promoting the development of high-end functional textiles. This invention is based on this technical background and aims to provide an innovative solution. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A method for preparing a textile coating with both flame-retardant and hydrophobic functions includes the following steps: Step S1: Synthesize a polysiloxane-modified waterborne polyurethane emulsion; Step S2: Prepare phytic acid-zinc complex flame retardant solution; Step S3: The products obtained in steps S1 and S2 are blended and coated onto the surface of the fabric, and then dried to form a flame-retardant coating. Step S4: The fabric treated in step S3 is immersed in an alcohol / water solution containing hexadecyltrimethoxysilane, and a hydrophobic layer is formed by a catalytic hydrolysis condensation reaction of the flame retardant layer.

[0008] In a preferred embodiment of the present invention, the preparation method of the polysiloxane-modified waterborne polyurethane emulsion in step S1 is as follows: Step 1: Dehydrate polytetrahydrofuran (PTMG), phosphorus-containing diol (OP550), and nonionic diol (N120) under vacuum at 110°C for 90 minutes for later use. Step 2: Weigh OP550, N120, PTMG, isophorone diisocyanate (IPDI), and dimethylolpropionic acid (DMPA) according to the specified ratio and place them in a four-necked flask equipped with a thermometer and a condenser. After stirring evenly, add the catalyst dibutyltin dilaurate (T-12) and heat to 85-90℃ for 1.5 hours. Then add polysiloxane (PDMS) and maintain the temperature at 85℃ for 1.5 hours. Next, introduce the chain extender trihydroxyphosphorus oxide (THPO) and react at 80℃ for 1 hour. During this stage, add an appropriate amount of acetone to adjust the viscosity of the system. Step 3: Then cool the system to 40℃, add triethylamine to neutralize for 15 min; finally add γ-aminopropyltriethoxysilane for end capping, and keep at 40℃ for 30 min; Step 4: The obtained product is emulsified with deionized water under high-speed shear for 30 minutes, and then the solvent is removed by vacuum distillation to obtain a polysiloxane-modified waterborne polyurethane emulsion.

[0009] As a preferred embodiment of the present invention, the preparation method of the phytic acid-zinc complex flame retardant solution in step S2 is as follows: First, 10g PA is diluted to 35wt% with distilled water; then, 2.48g zinc hydroxide is added, the system is significantly exothermic, and the solid is magnetically stirred at room temperature until it is completely dissolved to obtain a light yellow, transparent PAZn flame retardant solution; the molar ratio of PA to Zn(OH)2 is 1:2.5.

[0010] In a preferred embodiment of the present invention, the polysiloxane is a single-terminated dihydroxy polysiloxane, and its mass fraction in waterborne polyurethane is 5%-20%.

[0011] In a preferred embodiment of the present invention, the molar ratio of phytic acid to zinc hydroxide is 1:1 to 1:3.

[0012] In a preferred embodiment of the present invention, the mass ratio of ethanol to water in the alcohol / water solution is 4:1-7:1, and the mass fraction of hexadecyltrimethoxysilane is 5%-10%.

[0013] As a preferred embodiment of the present invention, a textile coating with both flame-retardant and hydrophobic functions is also disclosed. This coating is prepared using the steps described above. Specifically, a reactive siloxane structure is introduced into an aqueous polyurethane solution. The acidic catalytic effect of the phytic acid-zinc complex causes the siloxane to hydrolyze and condense, simultaneously reacting with P-OH to crosslink and form a flame-retardant layer on the fabric surface. Then, the finished fabric is immersed in an alcohol / water solution containing long-chain siloxanes. Through the catalytic effect of the flame-retardant layer on the long-chain siloxanes, a hydrophobic layer is formed in situ on the flame-retardant layer via crosslinking. This two-step construction of the flame-retardant and hydrophobic layers achieves the integration of flame-retardant and hydrophobic functions, with chemical bonding enhancing the adhesion and durability between the two layers.

[0014] Compared with the prior art, the present invention has the following advantages: This invention employs a two-step design combining a flame-retardant underlayer with a hydrophobic top layer, utilizing a phytic acid-zinc complex as a key bridge. This complex not only provides flame retardant and smoke-suppressing properties but also allows the phosphate groups on its surface to catalyze the hydrolytic condensation of the silane in the hydrophobic layer, forming a chemical bond (Si-OP). This structure organically combines the potentially antagonistic flame-retardant and hydrophobic components, avoiding functional cancellation and resulting in a finished fabric with both a high limiting oxygen index and a high water contact angle.

[0015] In this invention, the phosphorus-zinc-silicon multi-element synergistic effect endows the fabric with excellent flame retardancy, smoke suppression, anti-dripping properties, and hydrophobic self-cleaning function, and the performance retention rate is high after repeated washing and rubbing.

[0016] The core flame-retardant component of this invention uses phytic acid, which is renewable and biodegradable, and the overall process is mainly based on an aqueous system, reducing the use of organic solvents and meeting the requirements of green chemistry and sustainable development. Based on the two-step padding-impregnation method, the process is simple and easy to implement in industrial applications.

[0017] While giving fabrics dual functions, it has little impact on their mechanical properties and hand feel, maintaining good wearability and making it suitable for high-value-added finishing of a variety of textiles.

[0018] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] In the attached diagram: Figure 1 This is a schematic diagram of the reaction process of PAZn and the preparation of hydrophobic flame-retardant fabrics; Figure 2 These are the results of vertical combustion experiments in Embodiment 1 and the comparative example of the present invention; Figure 3 These are the hydrophobicity test results of Embodiment 1 and the comparative example of the present invention. Figure 4 These are the results of the feel and whiteness tests of Embodiment 1 and the comparative example of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0021] Example 1 (1) The preparation method of polysiloxane-modified waterborne polyurethane emulsion PDMS-WPU is as follows: Polytetrahydrofuran (PTMG), phosphorus-containing diol OP550, and nonionic diol N120 were pre-dehydrated at -0.1 MPa and 110°C for 90 min. 8.51 g of OP550, 8.53 g of N120, 18.90 g of PTMG, 19.87 g of isophorone diisocyanate (IPDI), and 1.11 g of dimethylolpropionic acid (DMPA) were weighed and placed in a four-necked flask equipped with a thermometer and condenser. After stirring thoroughly, 50 μL of the catalyst dibutyltin dilaurate (T-12) was added, and the mixture was heated to 85-90°C and reacted for 1.5 h. Then, 17.00 g of polysiloxane (PDMS) was added, and the mixture was kept at 85°C for 1.5 h. Next, 2.54 g of chain extender phosphorus trihydroxyoxide (THPO) was introduced, and the mixture was reacted at 80°C for 1 h. During this stage, 15 ml of acetone was added to adjust the viscosity of the system. The system was then cooled to 40°C, and 0.83 g of triethylamine was added for neutralization for 15 min. Finally, 8.50 g of γ-aminopropyltriethoxysilane was added dropwise for end-capping, and the mixture was kept at 40 °C for 30 min. The resulting product was emulsified with deionized water under high-speed shear for 30 min, and then the solvent was removed by vacuum distillation to obtain a flame-retardant waterborne polyurethane emulsion.

[0022] (2) Preparation of phytic acid-zinc (PAZn) solution First, dilute 10g PA to 35wt% with distilled water. Then, add 2.48g zinc hydroxide. The system is exothermic, and the solution is magnetically stirred at room temperature until the solid is completely dissolved, yielding a light yellow, transparent PAZn flame-retardant solution. The molar ratio of PA to Zn(OH)2 is 1:2.5.

[0023] (3) Preparation of hydrophobic flame-retardant fabrics A two-step method was used to prepare a flame-retardant and hydrophobic coating. First, an appropriate amount of PAZn was mixed evenly with PDMS-WPU, and polyester fabric was treated by padding (90% liquid retention). The treated fabric was then dried at 80℃, resulting in a 30% weight gain. Next, a hydrophobic finishing solution was prepared according to the following ratio: HDTMS, deionized water, and anhydrous ethanol, with a mass ratio of 1:3:15. Finally, the polyester fabric treated in the first step was immersed in the hydrophobic finishing solution and reacted at room temperature for 2 hours. After dehydration, it was dried at 80℃ and then baked at 120℃ for 3 minutes, resulting in a 7% weight gain.

[0024] Example 2 (1) The preparation method of polysiloxane-modified waterborne polyurethane emulsion PDMS-WPU is as follows: Polytetrahydrofuran (PTMG), phosphorus-containing diol OP550, and nonionic diol N120 were pre-dehydrated at -0.1 MPa and 110°C for 90 min. 11.24 g of OP550, 11.20 g of N120, 30.13 g of PTMG, 26.49 g of isophorone diisocyanate (IPDI), and 1.46 g of dimethylolpropionic acid (DMPA) were weighed and placed in a four-necked flask equipped with a thermometer and condenser. After stirring thoroughly, 60 μL of the catalyst dibutyltin dilaurate (T-12) was added, and the mixture was heated to 85-90°C and reacted for 1.5 h. Subsequently, 16.86 g of polysiloxane (PDMS) was added, and the mixture was kept at 85°C for 1.5 h. Then, 3.36 g of the chain extender phosphorus trihydroxyoxide (THPO) was introduced, and the mixture was reacted at 80°C for 1 h. During this stage, 20 ml of acetone was added to adjust the viscosity of the system. The system was then cooled to 40°C, and 1.10 g of triethylamine was added for neutralization for 15 min. Finally, 11.19 g of γ-aminopropyltriethoxysilane was added dropwise for end-capping, and the mixture was kept at 40°C for 30 min. The resulting product was emulsified with deionized water under high-speed shear for 30 min, and then the solvent was removed by vacuum distillation to obtain a flame-retardant waterborne polyurethane emulsion.

[0025] (2) Preparation of phytic acid-zinc (PAZn) solution First, dilute 15g PA to 35wt% with distilled water. Then, add 2.37g zinc hydroxide. The system is exothermic, and the solution is magnetically stirred at room temperature until the solid is completely dissolved, yielding a light yellow, transparent PAZn flame-retardant solution. The molar ratio of PA to Zn(OH)2 is 1:1.5.

[0026] (3) Preparation of hydrophobic flame-retardant fabrics A two-step method was used to prepare a flame-retardant and hydrophobic coating. First, an appropriate amount of PAZn was mixed evenly with PDMS-WPU, and polyester fabric was treated by padding (90% liquid retention). The treated fabric was then dried at 80℃, resulting in a 30% weight gain. Next, a hydrophobic finishing solution was prepared according to the following ratio: HDTMS, deionized water, and anhydrous ethanol, with a mass ratio of 1:3:15. Finally, the polyester fabric treated in the first step was immersed in the hydrophobic finishing solution and reacted at room temperature for 2 hours. After dehydration, it was dried at 80℃ and then baked at 120℃ for 3 minutes, resulting in a 7% weight gain.

[0027] Example 3 (1) The preparation method of polysiloxane-modified waterborne polyurethane emulsion PDMS-WPU is as follows: Polytetrahydrofuran (PTMG), phosphorus-containing diol OP550, and nonionic diol N120 were pre-dehydrated at -0.1 MPa and 110°C for 90 min. 13.31 g of OP550, 13.28 g of N120, 42.16 g of PTMG, 31.79 g of isophorone diisocyanate (IPDI), and 1.73 g of dimethylolpropionic acid (DMPA) were weighed and placed in a four-necked flask equipped with a thermometer and condenser. After stirring thoroughly, 70 μL of the catalyst dibutyltin dilaurate (T-12) was added, and the mixture was heated to 85-90°C and reacted for 1.5 h. Subsequently, 13.31 g of polysiloxane (PDMS) was added, and the mixture was kept at 85°C for 1.5 h. Then, 3.98 g of the chain extender phosphorus trihydroxyoxide (THPO) was introduced, and the mixture was reacted at 80°C for 1 h. During this stage, 30 ml of acetone was added to adjust the viscosity of the system. The system was then cooled to 40°C, and 1.30 g of triethylamine was added for neutralization for 15 min. Finally, 13.28 g of γ-aminopropyltriethoxysilane was added dropwise for end-capping, and the mixture was kept at 40°C for 30 min. The resulting product was emulsified with deionized water under high-speed shear for 30 min, and then the solvent was removed by vacuum distillation to obtain a flame-retardant waterborne polyurethane emulsion.

[0028] (2) Preparation of phytic acid-zinc (PAZn) solution First, dilute 20g PA to 35wt% with distilled water. Then, add 4.22g zinc hydroxide. The system is exothermic, and the solution is magnetically stirred at room temperature until the solid is completely dissolved, yielding a light yellow, transparent PAZn flame-retardant solution. The molar ratio of PA to Zn(OH)2 is 1:2.

[0029] (3) Preparation of hydrophobic flame-retardant fabrics A two-step method was used to prepare a flame-retardant and hydrophobic coating. First, an appropriate amount of PAZn was mixed evenly with PDMS-WPU, and polyester fabric was treated by padding (90% liquid retention). The treated fabric was then dried at 80℃, resulting in a 30% weight gain. Next, a hydrophobic finishing solution was prepared according to the following ratio: HDTMS, deionized water, and anhydrous ethanol, with a mass ratio of 1:3:15. Finally, the polyester fabric treated in the first step was immersed in the hydrophobic finishing solution and reacted at room temperature for 2 hours. After dehydration, it was dried at 80℃ and then baked at 120℃ for 3 minutes, resulting in a 7% weight gain.

[0030] Comparative Example 1: Unfinished polyester fabric Preparation method: Pure polyester fabric without flame retardant, hydrophobic and other functional finishing was directly selected as a blank reference sample without any additional treatment steps. The results are shown in Table 1 below.

[0031] Table 1 shows the LOI, cone calorimetry test, and mechanical property data for Example 1 and the control example. Based on the above embodiments and the experimental data in Table 1, a systematic analysis of the implementation effects of the present invention is conducted. For example... Figure 1 As shown, this invention successfully constructed a bilayer functional structure with a phytic acid-zinc (PAZn) complex as the reaction hub through a two-step process design. According to... Figure 2 The results of the vertical combustion experiment and the data in Table 1 show that untreated pure polyester fabric is flammable and produces severe dripping, while the fabric treated with this invention cannot be ignited in the vertical combustion test and does not produce dripping. Its LOI (Lowest Intake) increased from 19.5% to over 27.2%, meeting the standard for flame-retardant materials. Cone calorimetry data further confirms that the peak heat release rate (PHRR) and total heat release (THR) of the treated fabric decreased by more than 40% and 35%, respectively, and the total smoke production (TSP) also decreased significantly. This indicates that this invention not only effectively retards flames through the charring and isolating effect of the condensed phase, but also significantly inhibits the release of heat and smoke during combustion, greatly improving the fire safety level. Figure 3 The invention visually demonstrates the significant leap in hydrophobic properties resulting from the functional finishing process. The treated fabric exhibits a water contact angle of up to 149.4°, showcasing excellent superhydrophobic characteristics. Self-cleaning experiments show that surface contaminants can be easily rolled off by water droplets. More importantly, after 20 standard washes, the fabric still maintains a contact angle exceeding 126° and good flame retardancy (LOI: 27.4%). Combined with abrasion resistance test results, this proves that the chemical bonds such as Si-OP induced by PAZn effectively enhance the interfacial adhesion and durability of the functional coating, overcoming the shortcomings of traditional coatings such as easy peeling and poor wash resistance. Furthermore, hand feel, whiteness, and mechanical property tests show that this invention, while endowing the fabric with powerful functionality, also takes into account its basic practical attributes as a textile.

[0032] In summary, this invention is not a simple combination of flame-retardant and hydrophobic functions, but rather a fundamental technological innovation achieved through molecular bridging and structural design: (1) The phytic acid-zinc complex is creatively used as a bifunctional "reaction hub". In the first step, it is used to construct a stable flame retardant layer with polysiloxane-modified WPU. In the second step, the phosphorus hydroxyl groups on its surface can catalyze the hydrolysis and condensation of HDTMS and firmly anchor the hydrophobic layer by forming Si-OP covalent bonds. This design solves the technical problems of incompatibility between flame retardant and hydrophobic components and easy delamination of coating from the source.

[0033] (2) The fabric treated by the present invention achieves high performance indicators in both the two core functions of flame retardancy (flame resistance, anti-dripping, smoke suppression) and hydrophobicity (superhydrophobicity, self-cleaning). Furthermore, it ensures excellent washability and abrasion resistance through chemical bonding, thus achieving long-term protection.

[0034] (3) The entire process is based on an aqueous system and uses bio-based phytic acid, which is environmentally friendly. The process is simple and suitable for industrial production. The final product achieves a revolutionary functional improvement while maintaining the practicality of textiles, providing innovative material solutions that combine safety, comfort and durability for tents, protective clothing, high-end interiors and other fields.

[0035] Therefore, this invention provides a dual-function finishing technology for textiles with original design concepts, comprehensive performance, and industrializability, breaking through the current technical bottlenecks in this field and possessing outstanding innovation and application value.

[0036] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a textile coating with both flame-retardant and hydrophobic functions, characterized in that, Includes the following steps: Step S1: Synthesize a polysiloxane-modified waterborne polyurethane emulsion; Step S2: Prepare phytic acid-zinc complex flame retardant solution; Step S3: The products obtained in steps S1 and S2 are blended and coated onto the surface of the fabric, and then dried to form a flame-retardant coating. Step S4: The fabric treated in step S3 is immersed in an alcohol / water solution containing hexadecyltrimethoxysilane, and a hydrophobic layer is formed by a catalytic hydrolysis condensation reaction of the flame retardant layer.

2. The method for preparing a textile coating with both flame-retardant and hydrophobic functions according to claim 1, characterized in that, The preparation method of the polysiloxane-modified waterborne polyurethane emulsion in step S1 is as follows: Step 1: Dehydrate polytetrahydrofuran (PTMG), phosphorus-containing diol (OP550), and nonionic diol (N120) under vacuum at 110°C for 90 minutes for later use. Step 2: Weigh OP550, N120, PTMG, isophorone diisocyanate (IPDI), and dimethylolpropionic acid (DMPA) according to the specified ratio and place them in a four-necked flask equipped with a thermometer and a condenser. After stirring evenly, add the catalyst dibutyltin dilaurate (T-12) and heat to 85-90℃ for 1.5 hours. Then add polysiloxane (PDMS) and maintain the temperature at 85℃ for 1.5 hours. Next, introduce the chain extender trihydroxyphosphorus oxide (THPO) and react at 80℃ for 1 hour. During this stage, add an appropriate amount of acetone to adjust the viscosity of the system. Step 3: Then cool the system to 40℃, add triethylamine to neutralize for 15 min; finally add γ-aminopropyltriethoxysilane for end capping, and keep at 40℃ for 30 min; Step 4: The obtained product is emulsified with deionized water under high-speed shear for 30 minutes, and then the solvent is removed by vacuum distillation to obtain a polysiloxane-modified waterborne polyurethane emulsion.

3. The method for preparing a textile coating with both flame-retardant and hydrophobic functions according to claim 1, characterized in that, The preparation method of the phytic acid-zinc complex flame retardant solution in step S2 is as follows: First, dilute 10g PA to 35wt% with distilled water; then, add 2.48g zinc hydroxide. The system is significantly exothermic. Stir magnetically at room temperature until the solid is completely dissolved to obtain a light yellow, transparent PAZn flame retardant solution; the molar ratio of PA to Zn(OH)2 is 1:2.

5.

4. The method for preparing a textile coating with both flame-retardant and hydrophobic functions according to claim 1, characterized in that, The polysiloxane is a single-terminated dihydroxy polysiloxane, and its mass fraction in waterborne polyurethane is 5%-20%.

5. The method for preparing a textile coating with both flame-retardant and hydrophobic functions according to claim 1, characterized in that, The molar ratio of phytic acid to zinc hydroxide is 1:1 to 1:

3.

6. The textile coating with both flame-retardant and hydrophobic functions according to claim 1, and its preparation method, characterized in that, The mass ratio of ethanol to water in the alcohol / water solution is 4:1-7:1, and the mass fraction of hexadecyltrimethoxysilane is 5%-10%.

7. A textile coating with both flame-retardant and hydrophobic functions, characterized in that, The coating is prepared using the method described in any one of claims 1-6, which provides both flame retardant and hydrophobic properties for textiles.

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