Flame-retardant antibacterial fabric and preparation process thereof

Abstract

The invention relates to a flame-retardant antibacterial fabric and a preparation process thereof, and belongs to the technical field of functional textile finishing, the flame-retardant antibacterial fabric comprises a base cloth and a multifunctional finishing layer fixed on the fiber surface of the base cloth through chemical bonding; the multifunctional finishing layer is formed by hydrolytic condensation of a reaction type finishing agent containing phosphorus-nitrogen-silicon, the reaction type finishing agent is hyperbranched molecules with cyanuric chloride as a core framework, siloxane anchoring groups are introduced in the scheme, the finishing agent can be subjected to a dehydration condensation reaction with hydroxyl groups on the fiber surface of the base cloth, and therefore the fiber surface of the base cloth can be effectively protected; a firm covalent bond is formed, and meanwhile, a net-shaped structure is constructed through self-condensation reaction among silanol groups; the mechanism of combining chemical bonding and physical coating solves the problem that the auxiliary agent is easy to fall off in the prior art.

Description

Technical Field

[0001] This invention relates to the field of functional textile finishing, specifically to a flame-retardant and antibacterial fabric and its preparation process. Background Technology

[0002] Currently, the synergistic application of flame retardant and antibacterial properties is a research hotspot in the field of functional textiles. In conventional techniques, to achieve both flame retardant and antibacterial functions in fabrics, a physical blending method is typically used to mix flame retardants, antibacterial agents, and crosslinking agents to form a finishing solution. This treatment method primarily relies on the adsorption and binding of auxiliary molecules to the fiber surface through van der Waals forces or hydrogen bonds, or on the physical coating of the additives onto the fabric using adhesives.

[0003] However, this construction method based on physical adsorption or simple coating has significant drawbacks in related technologies. First, different functional auxiliary molecules often fail to achieve ideal compatibility in the finishing solution, resulting in extremely uneven distribution on the fiber surface and a scattered distribution of functional areas in the finished fabric. Second, due to the lack of a stable chemical bonding mechanism, the binding strength between auxiliary molecules and fibers is extremely low. After multiple standard washes, small-molecule flame retardants and antibacterial agents experience severe shedding, leading to a rapid loss of fabric functionality. Furthermore, in traditional compounding processes, flame-retardant and antibacterial components often interfere with each other. This antagonistic effect weakens their respective functional performance, making it difficult to achieve an efficient and durable performance balance on a single fabric. Especially when dealing with cotton fibers or cotton blends, existing finishing processes struggle to simultaneously ensure flame retardant and antibacterial effects while maintaining fabric performance and strength retention, requiring urgent improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a flame-retardant and antibacterial fabric and its preparation process, so as to solve the problems mentioned in the background art. Specifically, the technical solution of this invention is as follows: A flame-retardant and antibacterial fabric includes: a base fabric and a multifunctional finishing layer that is chemically bonded to the surface of the base fabric fibers; The multifunctional finishing layer is formed by hydrolysis and condensation of a phosphorus-nitrogen-silicon reactive finishing agent. The reactive finishing agent is a hyperbranched molecule with cyanuric chloride as its core framework, and its molecular structure is simultaneously grafted with: (a) Phosphorus-containing flame retardant groups derived from the reaction of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with paraformaldehyde; (b) An antibacterial group formed by the quaternization reaction of N,N-dimethyl-1,3-propanediamine with long-chain haloalkane; (c) Siloxane anchoring groups introduced by aminosilane coupling agents; The chemical bonding consists of Si-OC covalent bonds formed by the dehydration condensation of silanol generated from the hydrolysis of the siloxane anchoring group and the hydroxyl groups on the surface of the base fabric fiber, and a Si-O-Si network structure formed by the self-condensation of silanol.

[0005] A process for preparing a flame-retardant and antibacterial fabric includes the following steps: S1: Preparation of intermediate: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and paraformaldehyde were dissolved in toluene or xylene solvent and an addition reaction was carried out at 90-100℃ to obtain DOPO-methanol; S2: Low-temperature grafting: Dissolve cyanuric chloride in an organic solvent, and under ice-water bath conditions, control the system temperature at 0-5°C. Add a mixture of DOPO-methanol and sufficient acid-binding agent dropwise at constant pressure. Utilize the acid-binding agent to absorb the hydrogen chloride generated in real time, maintaining the system in an alkaline environment for nucleophilic substitution reaction. After reacting for 2-3 hours, filter to remove salts to obtain a monosubstituted intermediate. S3: Intermediate-temperature chain extension and quaternization: The system obtained in S2 was heated to 40-45℃, and N,N-dimethyl-1,3-propanediamine was added dropwise. The reaction was carried out for 3-4 hours to introduce a tertiary amine side group. Then, bromododecane was added, and the temperature was raised to 80-85℃ for reflux reaction for 3-5 hours to convert the tertiary amine side group into a long-chain alkyl quaternary ammonium salt. Unreacted bromododecane was removed by vacuum distillation to obtain a disubstituted intermediate. S4: High-temperature end-capping: Add 3-aminopropyltriethoxysilane and an acid-binding agent to the system obtained in S3, heat to 90-100℃ and keep the solvent under reflux, react for 3-5 hours, and remove the solvent by rotary evaporation under reduced pressure after the reaction to obtain the reactive finishing agent; S5: Fabric finishing: The reactive finishing agent obtained in S4 is formulated into a finishing solution, and the base fabric is subjected to two dips and two nips. After pre-drying, it is baked at high temperature, washed and dried to obtain the fabric.

[0006] Preferably, in step S2, the organic solvent is selected from at least one of toluene, dioxane, xylene, or tetrahydrofuran; The acid-binding agent is selected from at least one of triethylamine and pyridine; The molar ratio of cyanuric chloride to DOPO-methanol is 1:1 to 1.1.

[0007] Preferably, in step S3, the molar ratio of N,N-dimethyl-1,3-propanediamine to cyanuric chloride is 1:1 to 1.1; The molar ratio of bromododecane to N,N-dimethyl-1,3-propanediamine is 1:1 to 1.2; The solvent evaporation is controlled by a condenser reflux device during the reflux reaction process.

[0008] Preferably, in step S4, the molar ratio of 3-aminopropyltriethoxysilane to cyanuric chloride is 1:1 to 1.1; The vacuum degree of the reduced pressure rotary evaporation is controlled at -0.08 to -0.1 MPa, and the temperature is controlled at 50 to 60°C.

[0009] Preferably, in step S5, the finishing solution is prepared by dispersing 30-60 g / L of reactive finishing agent in water, adding 1-2 g / L of fatty alcohol polyoxyethylene ether nonionic penetrant, and adjusting the pH value to 4.5-5.5 with acetic acid.

[0010] Preferably, in step S5, the two-dip and two-roll process controls the roll residue rate to be 70%–80%; The pre-drying process conditions are: treatment at 90℃ for 3 to 5 minutes; The high-temperature baking process conditions are: processing at 165-175°C for 90-120 seconds; During the high-temperature baking process, the silanol groups of the finishing agent molecules construct a network cross-linked structure in situ on the fiber surface.

[0011] Compared with the prior art, the present invention has the following improvements and advantages: 1. This solution uses cyanuric chloride as the core framework and employs a temperature-controlled stepwise substitution strategy to orderly integrate phosphorus-containing flame-retardant groups, antibacterial groups, and siloxane anchoring groups into the same hyperbranched molecule. Compared with the uneven distribution caused by the simple physical blending of multiple additives in existing technologies, this solution ensures a highly uniform distribution of active elements such as phosphorus, nitrogen, and silicon at the molecular level. This site-specific grafting structure not only avoids the antagonistic effects between different functional components but also utilizes the intramolecular synergistic effect between triazine rings, phosphorus-containing groups, and siloxanes to induce the formation of a denser and more uniform expanded char layer when the fabric is heated, thereby significantly improving the flame-retardant efficiency. 2. This solution introduces siloxane anchoring groups, enabling the finishing agent to undergo a dehydration condensation reaction with the hydroxyl groups on the surface of the base fabric fibers, forming strong covalent bonds. Simultaneously, the self-condensation reaction between silanol groups constructs a network structure. This mechanism, combining chemical bonding and physical coating, solves the problem of easy detachment of additives in existing technologies. 3. This solution precisely controls process parameters, such as the weakly acidic environment of the finishing solution and a specific baking temperature, to construct a dense nano-functional film on the fiber surface in situ. This process achieves high flame retardancy and high antibacterial rate while effectively maintaining a high level of tensile strength retention. Compared with conventional processes that often sacrifice fiber strength for functionality, this solution achieves a good balance between flame retardancy, antibacterial properties and wearability. 4. This solution is not only applicable to pure cotton fabrics, but also exhibits excellent finishing effects on cotton blended fabrics. Even in blended systems with reduced cellulose hydroxyl groups, the self-condensing network structure formed by siloxanes can still physically coat the surface of other synthetic fibers. Combined with the chemical bonding with cotton fibers, it ensures the stability of the overall function and demonstrates strong practical value. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0013] Example 1: This embodiment aims to solve the problem in the prior art that flame retardants and antibacterial agents are difficult to permanently fix on the fiber surface and are prone to antagonism. The innovative design of this reactive finishing agent lies in using cyanuric chloride as the core skeleton and assembling functional groups in an orderly manner on the same molecular skeleton through a temperature-controlled stepwise substitution strategy. This embodiment specifies the specific process parameters: In step S1, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide reacts with paraformaldehyde at a molar ratio of 1:1 at 95°C in an addition reaction. In step S2, cyanuric chloride is dissolved in toluene, the system temperature is controlled at 2°C, the molar ratio of cyanuric chloride to DOPO-methanol is 1:1, triethylamine is used as the acid binder, and its amount is 1.02 times the molar amount of DOPO-methanol. The reaction time is 2.5 hours. In step S3, the temperature is raised to 42°C, and a mixture of N,N-dimethyl-1,3-propanediamine and triethylamine (molar ratio 1:1.05) is added dropwise, along with cyanuric chloride (molar ratio 1:1), and the mixture is reacted for 3.5 hours. Then, an equimolar ratio of bromododecane is added, and the mixture is heated to 82°C and refluxed for 4 hours. In step S4, 3-aminopropyltriethoxysilane and triethylamine are added in an equimolar ratio with cyanuric chloride, and the mixture is heated to 95°C and reacted for 4 hours. Regarding the specific connection mode of the molecular structure: In step S2, the hydroxyl oxygen atom of DOPO-methanol nucleophilically attacks the carbon atom at the 2-position of the triazine ring, removing HCl to form a COC bond connecting to the phosphorus-containing group; In step S3, the primary amine nitrogen atom at one end of N,N-dimethyl-1,3-propanediamine attacks the carbon atom at the 4-position of the triazine ring, forming a CN bond connecting to the antibacterial precursor; In step S4, the primary amine nitrogen atom of the silane coupling agent attacks the carbon atom at the 6-position of the triazine ring, forming a CN bond to connect the anchoring group; this site-specific grafting ensures the uniqueness of the structure; infrared spectroscopy characterization shows a characteristic absorption peak of the triazine ring at 1550 cm⁻¹, a P=O stretching vibration peak at 1210 cm⁻¹, and a Si-O-Si vibration peak near 1100 cm⁻¹, proving that the functional group has been successfully grafted; in the fabric finishing process in S5, the finishing agent concentration is set to 30 g / L, the baking temperature is 165℃, and the final fabric has an LOI of 29.1% and an antibacterial rate of 99.1%.

[0014] Example 2: This embodiment is based on Example 1, employing a specific optimized ratio to improve the grafting rate. Specifically, in step S2, dioxane is used as the solvent, pyridine as the acid-binding agent, and the molar ratio of cyanuric chloride to DOPO-methanol is precisely set to 1:1.08, utilizing excess substrate to drive the equilibrium forward. In step S3, the molar ratio of N,N-dimethyl-1,3-propanediamine to cyanuric chloride is set to 1:1.05, and the molar ratio of bromododecane to N,N-dimethyl-1,3-propanediamine is set to 1:1.15, ensuring complete conversion of the tertiary amine side groups to quaternary ammonium salts. During the reflux reaction, 5°C cooling water is circulated through the condenser to control solvent evaporation. Under this specific ratio, the prepared finishing agent exhibits high functionality. Testing showed that the fabric prepared with this specific formulation achieved an LOI of 32.4% and an inhibition rate against Staphylococcus aureus of 99.9%, demonstrating the technical advantages of this specific numerical point formulation.

[0015] Example 3: In step S4, the molar ratio of 3-aminopropyltriethoxysilane to cyanuric chloride is 1:1 to 1.1; the vacuum degree of rotary evaporation is controlled at -0.08 to -0.1 MPa, and the temperature is controlled at 50 to 60 °C.

[0016] This embodiment aims to explore the intermediate balance point of process parameters to obtain the best cost performance and overall performance. Specifically, in step S4, the molar ratio of 3-aminopropyltriethoxysilane to cyanuric chloride is precisely controlled at 1:1.05, and the reaction temperature is maintained at 95°C. This molar ratio setting ensures the complete substitution of the third chlorine atom and avoids the self-polymerization side reaction of excess silane coupling agent in the system, thereby ensuring the high purity of the reactive finishing agent. In the subsequent vacuum rotary evaporation process, the vacuum degree is controlled at 0.09 MPa and the temperature at 55°C. These mild desolventizing conditions effectively prevent the degradation of heat-sensitive groups while ensuring the complete removal of solvent. This embodiment effectively suppresses the occurrence of side reactions by precisely controlling the molar ratio of each reaction step and the post-treatment conditions, achieving a good balance between flame retardancy, antibacterial properties and usability.

[0017] Example 4: In step S5, the finishing solution is prepared as follows: 30-60 g / L of reactive finishing agent is dispersed in water, 1-2 g / L of fatty alcohol polyoxyethylene ether nonionic penetrant is added, and the pH value is adjusted to 4.5-5.5 with acetic acid.

[0018] This embodiment focuses on investigating the effects of different solvent systems and finishing solution environments on the performance of the finished product. A cotton blended fabric with a cotton / polyester 80 / 20 base fabric was used. The finishing agent concentration was set at 50 g / L, and 1.5 g / L of penetrant was added. The pH value was adjusted to 4.8, creating a weakly acidic environment. Maintaining the pH value between 4.5 and 5.5 is crucial for inhibiting the premature condensation of silanol groups in the solution, which prolongs the pot life of the finishing solution. It also promotes the protonation catalytic reaction between silanol and cellulose hydroxyl groups. The addition of penetrant significantly reduces the surface tension of the finishing solution, allowing it to quickly wet and penetrate into the tightly blended yarn. The experiment found that although the presence of polyester component reduced the total number of cellulose hydroxyl groups, the self-condensing network structure formed by siloxane anchoring groups could still physically coat the polyester surface. Combined with the chemical bonding with cotton fibers, this demonstrates that the finishing solution formulation has broad base fabric adaptability.

[0019] Example 5: In step S5, the two-dip and two-roll process controls the roll residue rate to be 70%–80%; the pre-drying process conditions are 3–5 minutes at 90°C; the high-temperature baking process conditions are 90–120 seconds at 165–175°C; during the high-temperature baking process, the silanol groups of the finishing agent molecules construct a network cross-linked structure in situ on the fiber surface.

[0020] This embodiment verifies the specific implementation effect of the rapid curing process. In the fabric finishing stage, the roll-off rate of the two dips and two nips is precisely controlled at 75%; the pre-drying process is set to be treated at 90°C for 4 minutes; the high-temperature baking process is set to be treated at 170°C for 100 seconds. Under these specific process points, the high-temperature thermal shock causes the silanol groups of the finishing agent molecules to undergo a rapid dehydration condensation reaction, constructing a dense nano-functional film in situ on the fiber surface. The experimental results show that the LOI of the fabric treated under these conditions is 31.5%, and the LOI still remains at 29.4% after 50 washes. This indicates that the baking conditions of 170°C / 100s are sufficient to achieve a strong bond between the finishing agent and the fiber, taking into account both production efficiency and product performance.

[0021] Comparative Example 1: This comparative example uses a physical blending method to prepare the finishing solution, but does not use the cyanuric chloride skeleton of the present invention for chemical bonding. Specifically, DOPO, dodecyltrimethylammonium bromide, and KH-550 silane coupling agent are simply mixed and dissolved in water according to the molar ratio in Example 3 to prepare a finishing solution of the same concentration. The fabric is then impregnated and baked according to the process of Example 3. Due to the lack of a triazine ring skeleton to integrate phosphorus, nitrogen, and silicon groups into the same molecule, the functional components are unevenly distributed on the fiber surface. Furthermore, due to the lack of a unified chemical bonding mechanism, small molecule flame retardants and antibacterial agents are easily detached during washing, resulting in extremely poor wash resistance.

[0022] Comparative Example 2: The finishing agent prepared in this comparative example did not introduce siloxane anchoring groups. In step S4, n-butylamine was used instead of 3-aminopropyltriethoxysilane for the end-capping reaction. The remaining steps were the same as in Example 3. Since the silanol precursor that can react with the fiber was missing in the molecular structure, the finishing agent was only adsorbed on the fiber surface by van der Waals forces and hydrogen bonds. Although the initial flame retardant and antibacterial properties were acceptable, it could not form Si-OC covalent bonds and Si-O-Si network structures, resulting in the loss of its function after standard washing tests.

[0023] Comparative Example 3: The finishing agent prepared in this comparative example did not introduce phosphorus-containing flame-retardant groups; in step S2, phenol was used instead of DOPO-methanol for the substitution reaction, and the remaining steps were the same as in Example 3. This comparative example aims to verify the core role of phosphorus in the synergistic system. The resulting fabric only has antibacterial function and certain hydrophobicity, provided by long-chain alkyl groups, but the limiting oxygen index is extremely low and cannot meet the flame-retardant standard, which confirms the indispensability of DOPO groups in the ternary synergy.

[0024] Verification test To verify the technical effect of the flame-retardant and antibacterial fabric of the present invention, rigorous performance tests were conducted on the fabrics obtained in Examples 1-5 and Comparative Examples 1-3.

[0025] Test Standards 1. Limiting oxygen index: Tested according to GB / T5455-2014 standard, used to evaluate the flammability of fabrics; 2. Antibacterial rate: The antibacterial performance against Staphylococcus aureus was evaluated by shaking method according to GB / T20944.3-2008. 3. Washing resistance: After washing 50 times according to AATCC135 standard, the LOI and antibacterial rate were tested again to verify the strength of the chemical bond; 4. Tensile strength retention rate: The change in warp strength before and after finishing is tested according to GB / T3923.1-2013 to evaluate the degree of damage to the physical properties of the base fabric caused by the finishing process.

[0026] Specific testing process Triples of samples were prepared for each group. Each sample was conditioned for 24 hours under standard atmospheric conditions before testing. The Locator Index (LOI) test was repeated 5 times and the average value was taken. The Antibacterial Rate test was repeated 3 times and the average value was taken. Tensile Strength Retention Rate... The calculation formula is: ; in, This refers to the tensile strength of the finished fabric. This represents the breaking strength of the original fabric.

[0027]

[0028] As can be seen from the test results in the table above, the flame-retardant and antibacterial fabrics prepared in Examples 1-5 all exhibited excellent initial performance and washability, with a significant synergistic effect. Comparing Example 3 and Comparative Example 1, under the same dosage, the chemical bonding structure of Example 3 resulted in a significantly higher LOI value than the physically blended Comparative Example 1, 30.8% vs 24.5%. This indicates that fixing phosphorus, nitrogen, and silicon onto the same molecular framework helps to form a more uniform and dense expanded char layer during combustion, thus exerting an intramolecular synergistic effect. Washability verification: After 50 washes, the LOI of Example 3 remained at 29.0%, and the antibacterial rate remained at 97.1%. In contrast, Comparative Example 2, lacking siloxane anchoring groups, almost completely lost its function after washing. This fully demonstrates that the aforementioned Si-OC covalent bonds and Si-O-Si network structure are crucial for achieving long-lasting functionality. Furthermore, the influence of process parameters: Example 2 used a higher concentration of finishing agent, and all its indicators were optimal, but the breaking strength retention rate decreased slightly to 88.2%. This was due to the excessive crosslinking density leading to a slight increase in fiber brittleness. Although Example 1 had the lowest concentration, all indicators still met the basic requirement of LOI ≥ 29.0%, proving the high efficiency of the technical solution of this invention. Structural integrity: Comparative Example 3 lacked phosphorus, resulting in the LOI failing to meet the standard, indicating that the DOPO group is the core source of flame retardancy, and nitrogen, triazine rings, and silicon alone cannot provide sufficient flame retardant performance.

[0029] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A flame-retardant and antibacterial fabric, characterized in that, include: A base fabric and a multifunctional finishing layer bonded to the surface of the base fabric fibers by chemical bonding; The multifunctional finishing layer is formed by hydrolysis and condensation of a phosphorus-nitrogen-silicon reactive finishing agent. The reactive finishing agent is a hyperbranched molecule with cyanuric chloride as its core framework, and its molecular structure is simultaneously grafted with: (a) Phosphorus-containing flame retardant groups derived from the reaction of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with paraformaldehyde; (b) An antibacterial group formed by the quaternization reaction of N,N-dimethyl-1,3-propanediamine with long-chain haloalkane; (c) Siloxane anchoring groups introduced by aminosilane coupling agents; The chemical bonding consists of Si-OC covalent bonds formed by the dehydration condensation of silanol generated from the hydrolysis of the siloxane anchoring group and the hydroxyl groups on the surface of the base fabric fiber, and a Si-O-Si network structure formed by the self-condensation of silanol.

2. A preparation process for the flame-retardant and antibacterial fabric according to claim 1, characterized in that, Includes the following steps: S1: Preparation of intermediate: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and paraformaldehyde were dissolved in toluene or xylene solvent and an addition reaction was carried out at 90-100℃ to obtain DOPO-methanol; S2: Low-temperature grafting: Dissolve cyanuric chloride in an organic solvent, and under ice-water bath conditions, control the system temperature at 0-5°C. Add a mixture of DOPO-methanol and sufficient acid-binding agent dropwise at constant pressure. Utilize the acid-binding agent to absorb the hydrogen chloride generated in real time, maintaining the system in an alkaline environment for nucleophilic substitution reaction. After reacting for 2-3 hours, filter to remove salts to obtain a monosubstituted intermediate. S3: Intermediate-temperature chain extension and quaternization: The system obtained in S2 was heated to 40-45℃, and N,N-dimethyl-1,3-propanediamine was added dropwise. The reaction was carried out for 3-4 hours to introduce a tertiary amine side group. Then, bromododecane was added, and the temperature was raised to 80-85℃ for reflux reaction for 3-5 hours to convert the tertiary amine side group into a long-chain alkyl quaternary ammonium salt. Unreacted bromododecane was removed by vacuum distillation to obtain a disubstituted intermediate. S4: High-temperature end-capping: Add 3-aminopropyltriethoxysilane and an acid-binding agent to the system obtained in S3, heat to 90-100℃ and keep the solvent under reflux, react for 3-5 hours, and remove the solvent by rotary evaporation under reduced pressure after the reaction to obtain the reactive finishing agent; S5: Fabric finishing: The reactive finishing agent obtained in S4 is formulated into a finishing solution, and the base fabric is subjected to two dips and two nips. After pre-drying, it is baked at high temperature, washed and dried to obtain the fabric.

3. The preparation process of a flame-retardant and antibacterial fabric according to claim 2, characterized in that, In step S2, the organic solvent is selected from at least one of toluene, dioxane, xylene, or tetrahydrofuran; The acid-binding agent is selected from at least one of triethylamine and pyridine; The molar ratio of cyanuric chloride to DOPO-methanol is 1:1 to 1.

1.

4. The preparation process of a flame-retardant and antibacterial fabric according to claim 2, characterized in that, In step S3, the molar ratio of N,N-dimethyl-1,3-propanediamine to cyanuric chloride is 1:1 to 1.1; The molar ratio of bromododecane to N,N-dimethyl-1,3-propanediamine is 1:1 to 1.2; The solvent evaporation is controlled by a condenser reflux device during the reflux reaction process.

5. The preparation process of a flame-retardant and antibacterial fabric according to claim 2, characterized in that, In step S4, the molar ratio of 3-aminopropyltriethoxysilane to cyanuric chloride is 1:1 to 1.1; The vacuum degree of the reduced pressure rotary evaporation is controlled at -0.08 to -0.1 MPa, and the temperature is controlled at 50 to 60°C.

6. The preparation process of a flame-retardant and antibacterial fabric according to claim 2, characterized in that, In step S5, the finishing solution is prepared by dispersing 30-60 g / L of reactive finishing agent in water, adding 1-2 g / L of fatty alcohol polyoxyethylene ether nonionic penetrant, and adjusting the pH value to 4.5-5.5 with acetic acid.

7. The preparation process of a flame-retardant and antibacterial fabric according to claim 2, characterized in that, In step S5, the two-dip and two-roll process controls the roll residue rate to be 70%–80%. The pre-drying process conditions are: treatment at 90℃ for 3 to 5 minutes; The high-temperature baking process conditions are: processing at 165-175°C for 90-120 seconds; During the high-temperature baking process, the silanol groups of the finishing agent molecules construct a network cross-linked structure in situ on the fiber surface.

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