Preparation process of nylon base cloth flame-retardant label tape

Abstract

The invention relates to a preparation process of a nylon base cloth flame-retardant label tape. The preparation process of the nylon base cloth flame-retardant label tape comprises the following steps: carrying out flame-retardant treatment on base cloth through four working procedures of pretreatment, shaping treatment, coating treatment and after-treatment, and then drying to obtain a finished product, the invention discloses a pretreatment processing technology of nylon thick base cloth, which comprises the following steps: selecting pure nylon thick base cloth, pretreating the base cloth, and adding a penetrant in a desizing process; after the pretreatment of the base cloth is completed, carrying out first flame retardant treatment on the base cloth, and putting the base cloth into a phosphorus flame retardant added with a penetrant for padding during shaping; the second flame-retardant treatment is flame-retardant coating adhesive coating treatment; in the third flame-retardant treatment, a phosphorus-based flame retardant with affinity with ink is selected, the coated cloth is subjected to padding treatment, and the sequence of flame-retardant finishing is phosphorus-based flame retardant, phosphorus-based flame retardant, nitrogen-based flame retardant and phosphorus-based flame retardant. According to the invention, the pure nylon flame-retardant thick label tape with good flame-retardant effect and excellent printing performance can be obtained.

Description

Technical Field

[0001] The invention relates to a preparation process of a nylon base cloth flame-retardant trademark tape. Background Art

[0002] Nylon fabric has high surface gloss, smooth feel and good toughness. However, it has poor heat resistance and is a flammable material, which will produce dripping during combustion. Therefore, it is more difficult to make nylon material flame retardant than polyester material. And the primary function of trademark tape products is to record information of textiles, bags and other commodities. Nylon (PA) was first developed by DuPont in the United States. PA is widely used in various fields due to its good mechanical properties and processability, heat resistance, corrosion resistance and self-lubrication. However, nylon also has disadvantages. Its chemical structure is mainly composed of carbon and hydrogen. Nylon is highly flammable and there are potential fire hazards in people's daily life and production. Nylon will produce a large amount of toxic and corrosive smoke during combustion, which will cause serious consequences in fire. In view of this, many countries currently attach great importance to the flame retardant modification of nylon and are committed to the development and production of various flame retardants.

[0003] Existing flame retardants have defects such as high toxicity, smoke, low flame retardant effect, and poor compatibility with polymers. Therefore, seeking a flame retardant with low toxicity, low smoke release, high efficiency, not easy to migrate, good thermal stability and compatibility, and not excessively affecting the performance of the substrate has become a hot topic for domestic and foreign scholars. Reactive organophosphorus flame retardants have their flame retardant structures embedded in the molecular chains of polymers. During the combustion process, the flame retardant structure does not migrate, and the flame retardant is more efficient and lasting, so it has become a hot topic for flame retardants at home and abroad. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that nylon has poor heat resistance and is flammable, and finally obtain a nylon base fabric with good flame retardant performance, good printing performance and color fastness.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A preparation process of a nylon base fabric flame retardant label tape, comprising four steps of base fabric pre-treatment, shaping treatment, coating treatment, and post-treatment for flame retardant treatment, to obtain a pure nylon flame retardant thick label tape with good flame retardant effect and good printing performance. The specific implementation plan is as follows: 1) Selection of base fabric and its pre-treatment The base fabric is made of pure nylon thick base fabric. First, the base fabric is pre-treated and 0.5-1g / L of penetrant is added during the desizing process. After the pre-treatment of the base fabric, the first flame retardant treatment is performed on it. When finalizing, the base fabric is dipped in a phosphorus flame retardant with penetrant.

[0006] Among them, adding penetrants during the desizing process can improve the desizing effect and the fluffiness of fabric fibers, thereby improving the penetration uniformity of flame retardants in subsequent processes.

[0007] During shaping, the base fabric is dipped into a phosphorus-based flame retardant with a penetrant to improve the penetration uniformity of the flame retardant.

[0008] 2) Preparation of flame retardant rubber and coating treatment process The second flame retardant treatment is the flame retardant coating glue coating treatment.

[0009] The flame retardant rubber material is prepared by mixing nylon waste silk, phosphorus flame retardant, nitrogen flame retardant and penetrant.

[0010] Coating adhesive formula: nylon waste silk, flame retardant 1 (nitrogen series), flame retardant 2 (phosphorus series), penetrant.

[0011] The flame retardant layer rubber material used in the scheme of the present invention is a halogen-free flame retardant rubber material, which is green and environmentally friendly, has low smoke emission, low initial smoke density, and excellent flame retardant performance. At the same time, the addition of a penetrant can improve the adhesion between the three flame retardant layers, so that they are organically combined and not easy to fall off, and do not affect the printing function and water washing resistance of the trademark tape. The nylon base cloth flame retardant trademark tape of the present invention is a textile specially used for trademark cloth, which needs to be used for printing text. It does not affect the printing function while obtaining excellent flame retardant performance, and also has excellent water washing resistance. When washed with water, the flame retardant performance is still maintained; the printed font will not be washed off.

[0012] 3) Design of flame retardant label coating equipment In view of the particularity of the flame retardant coating agent used in the project and the uniformity requirements of flame retardant products, a new coating head was designed to ensure the stability and uniformity of the coating amount and the uniformity of the coating product thickness, with a unit area mass deviation of ±4g / ㎡ and a thickness deviation of ±0.01mm.

[0013] The scheme of the present invention designs a special coating head according to the uniqueness of the flame retardant rubber material, so as to achieve stability and uniformity in thickness and glue coating amount. The prepared trademark tape has a smooth surface and high smoothness, a unit area mass deviation of ±4g / ㎡, a thickness deviation of ±0.01mm, and good uniformity. The prepared trademark tape can be suitable for ink printing, meets the requirements for trademark identification, and is compatible with the rubber material.

[0014] 4) Ink absorption of flame retardant thick label tape In the third flame retardant treatment of the post-finishing process, a phosphorus-based flame retardant with affinity to ink is selected for impregnation treatment of the coated cloth, and after impregnation with the flame retardant, it is dried in an anvil oven.

[0015] Among them, conventional flame retardants will affect the ink absorption of the product. In the third flame retardant treatment of the finishing process, a phosphorus-based flame retardant with affinity to ink is selected to dip and roll the coated cloth to improve the ink absorption of the trademark tape.

[0016] Preferably, the shaping process in step 1 is as follows: the amount of flame retardant is 20-30%, the temperature is 170-180°C, the vehicle speed is 60-70m / min; two dips and two rolls, and the rolling pressure is 2-3kg.

[0017] As a preferred method, flame retardant coating adhesive is prepared by adding 85-90 parts of nylon waste silk, 70-80 parts of flame retardant 1 (nitrogen series), 14-20 parts of flame retardant 1 (phosphorus series), and 0.5-1 parts of penetrant into a beaker and stirring at 300-500r / min for 10-15min to obtain flame retardant coating adhesive latex. Before use, add a measured amount of thickener, increase the stirring speed to 1000-1500r / min, and stir for 5-10min to increase the viscosity of the emulsion to the coating requirement.

[0018] As a preferred coating process: flame retardant coating glue coating, the glue coating amount is 25-30g / m 2 →Bake (70-80℃, 2-5min) →Bake (150-160℃, 3-5min), scraper thickness 1-2mm.

[0019] Preferably, the penetrant is fatty alcohol polyoxyethylene ether.

[0020] Preferably, the preparation of phosphorus flame retardant 1 is as follows: the hypophosphorous acid is evaporated in a water bath at 50-60°C using a rotary evaporator to remove the solvent therein. In an ice-water bath, crystalline hypophosphorous acid and trimethyl orthoformate are added to a three-necked flask in a ratio of 1:1-1:5, a magnetic stirrer is turned on, the temperature is raised to room temperature, and the reaction is carried out at this temperature for 1-3 h, and then distilled under vacuum conditions to remove methanol and methyl formate until a pale yellow solid powder is formed. In an ice-water bath, 0.5-1 mol of acrylonitrile and 6-8 g of catalyst triethylamine are added to the three-necked flask, the temperature is raised to 50-60°C, and the reaction is carried out for 1-3 h. Then 0.5-0.8 mol of hydrochloric acid is added, the temperature is raised to 80-90°C, and the reaction is carried out for 1-3 h. After the reaction is completed, the solution is cooled, filtered to remove the ammonium chloride, and then recrystallized in acetone / acetic acid to obtain the product.

[0021] Preferably, the phosphorus-based flame retardant 2 with ink affinity is used: a proper amount of polypropylene glycol (PPG 1000) is vacuum-dehydrated at 100-110°C for 3-4 h, and a proper amount of 2,2-dihydroxymethylpropionic acid (DMPA) and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) is dried and dehydrated in an oven at 90-100°C for 3-4 h. Take a certain amount of dried PPG1000 in a 500 mL four-necked flask, heat the oil bath to 80-90°C, dissolve the dried DMPA with a small amount of 1-methyl-2-pyrrolidone (NMP) at 70-80°C, transfer it to the flask and stir to mix evenly, add the measured 2,4-toluene diisocyanate (TDI) drop by drop, then drop 0.05-0.1wt% dibutyltin dilaurate, keep 80-90°C for reaction for 2-4h, then add the measured ODOPB that has been dried in advance and dissolved in N, N-dimethylformamide (DMF), and react at 70-80°C for 2-4h to obtain the prepolymer. The temperature drops to below 20-30°C, and a small amount of acetone is added during the reaction to adjust the viscosity. Add an appropriate amount of triethylamine at room temperature to neutralize until the pH is 6-8. Deionized water was added dropwise to the prepolymer under high-speed stirring, and 2-3 g of isophorone diamine (IPDA) was added dropwise after the addition was completed. The emulsification was stopped after stirring for 30-40 min. Acetone, a small amount of DMF and NMP solvents were removed by vacuum heating to obtain an emulsion of flame-retardant modified waterborne polyurethane (FR-WPU).

[0022] Preferably, the nitrogen-based flame retardant is melamine.

[0023] As a preferred method, the post-finishing padding process conditions are as follows: temperature 160-170°C, vehicle speed 40-50m / min, flame retardant 15-20%, and padding pressure 2-3kg. After the flame retardant padding, the product is dried in an anvil oven at a baking temperature of 140°C-150°C and a baking time of 1-2min.

[0024] The flame retardant finished product is verified by cutting the product into strips and testing the uniformity of the flame retardancy respectively.

[0025] Meanwhile, when coating the trademark tape, most of the existing coating equipment cannot control the uniformity of the flame retardant liquid coated on the trademark tape, which will cause the flame retardant liquid coated on the trademark tape to be unevenly distributed. Therefore, the present invention also designs a flame retardant trademark tape coating equipment.

[0026] The invention relates to a flame-retardant trademark tape coating device, comprising a support plate, a top beam and a trademark tape are respectively arranged on the top and bottom of the trademark tape production device, the bottom end of the top beam is connected to the top end of the support plate, a mounting assembly is arranged at the right end of the support plate, a sliding fixing assembly is arranged on the right side of the mounting assembly, a glue coating assembly is arranged at the bottom end of the sliding fixing assembly, a flame-retardant liquid stirring assembly is arranged at the top of the top beam, the glue coating assembly comprises a liquid discharge cylinder, a connecting head, a hose and a liquid discharge cap, a first chamber is arranged inside the liquid discharge cylinder, a connecting threaded hole is arranged at the top of the liquid discharge cylinder, a first thread is arranged on the top outer wall of the connecting head, the connecting threaded hole is threadedly connected to the bottom of the connecting head, the top of the connecting head is connected to the bottom end of the hose, a liquid discharge head is arranged at the bottom end of the liquid discharge cylinder, a second thread is arranged on the bottom outer wall of the liquid discharge head, a discharge hole is arranged at the top of the liquid discharge cap, a third thread is arranged at the top inner end of the discharge hole, the discharge hole is threadedly connected to the liquid discharge head, and a lifting scraper assembly is arranged at the right end of the liquid discharge cylinder.

[0027] In view of the particularity of the flame retardant coating agent used in the present invention and the requirement of uniformity of flame retardant products, a new coating equipment is designed to ensure the stability and uniformity of the coating amount and the uniformity of the thickness of the coating product, with a unit area mass deviation of ±4g / ㎡ and a thickness deviation of ±0.01mm.

[0028] The present invention discloses a flame-retardant trademark tape coating device, wherein the lifting scraper assembly comprises a lifting slide, a slider, a lifting screw and a scraper, the right end of the liquid discharge cylinder is connected to the left end of the lifting slide, a second chamber is arranged inside the lifting slide, the lifting slide and the slider are slidably fitted, a lifting through-threaded hole is arranged at the top of the lifting slide, the lifting through-threaded hole is threadedly connected to the lifting screw, the bottom end of the lifting screw is connected to the top bearing of the slider, and the bottom end of the slider is connected to the top of the scraper.

[0029] The present invention provides a flame-retardant trademark coating device, wherein the mounting assembly includes two groups of first screws, two groups of first threaded holes are arranged at the right end of a support plate, a clamping groove is arranged at the right end of the mounting plate, two groups of first through holes are arranged at the left end of the clamping groove, and the two groups of first screws are threadedly connected to the first threaded holes through the first through holes respectively.

[0030] The present invention discloses a flame-retardant trademark belt coating device, wherein a sliding fixing component comprises a fixing block, a clamping slider and two groups of second screws, the top end of a liquid discharge cylinder is connected to the bottom end of the fixing block, the left end of the liquid discharge cylinder is connected to the right end of the clamping slider, the clamping slider is slidably clamped with the clamping slide groove, the right end of the fixing block is provided with two groups of second through holes, the right end of a supporting plate is provided with two groups of second threaded holes, and the two groups of second screws are threadedly connected with the second threaded holes through the second through holes, respectively.

[0031] The present invention discloses a flame-retardant trademark coating device, wherein the flame-retardant liquid stirring assembly comprises a stirring drum, a reduction motor and a rotating rod, the top end of a top beam is connected to the bottom end of the stirring drum, the top end of the stirring drum is connected to the bottom end of the reduction motor, a third chamber is arranged in the stirring drum, the output end bearing seal of the reduction motor is inserted into the third chamber, the bottom end of the reduction motor is connected to the top end of the rotating rod, a stirring blade is arranged at the bottom of the rotating rod, a feed port is arranged at the left end of the stirring drum, a discharge port is arranged at the bottom end of the stirring drum, the bottom end seal of the discharge port passes through the bottom end of the top beam, and the discharge port is communicated with the top end of a hose.

[0032] In summary, the scheme of the present invention: 1. Use pure nylon thick base fabric, through the flame retardant padding pretreatment of the base fabric, as well as the flame retardant rubber coating treatment and flame retardant padding post-finishing, finally form a trademark tape with good flame retardant and printing performance. The flame retardant layer of this product is soft in texture, and the flame retardant effect meets the FMVSS 302 standard, which can meet the requirements of not burning or burning horizontally on the flame at a speed not exceeding 102mm / min; it can be used in car interiors, outdoor fabrics, curtains and other occasions that require thick trademark fabrics; 2. When the flame-retardant trademark tape coating equipment designed by the present invention is adopted, the liquid discharge cylinder is first installed on the support plate through the installation component and the sliding fixing component, and then a suitable liquid discharge cap is selected and then installed at the liquid discharge head of the liquid discharge cylinder. Then the flame-retardant liquid stirring component injects the flame-retardant liquid into the liquid discharge cylinder through a hose, and then the flame-retardant liquid drips onto the trademark tape through the liquid discharge cylinder, the liquid discharge head and the liquid discharge cap, and then the flame-retardant liquid on the trademark tape is scraped off by the lifting scraper component, so as to control the thickness and uniformity of the flame-retardant liquid on the trademark tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the connection structure of the flame retardant trademark belt coating equipment of the present invention; Figure 2 It is a schematic diagram of the sliding and clamping structure of the clamping slide block and the clamping slide groove of the flame-retardant trademark coating device of the present invention; Figure 3 It is a schematic diagram of the enlarged structure of the flame-retardant trademark belt coating equipment of the present invention; Figure 4 It is a schematic diagram of the enlarged structure of the B part of the flame-retardant trademark coating equipment of the present invention; Figure 5 This is the preparation process of nylon base fabric flame retardant trademark tape; Figure 6 It is a printed photo of the trademark belt in Example 1 of the present invention; Figure 7 This is a printed photo of the trademark tape of Comparative Example 1.

[0034] Markings in the attached figure: 1. top beam; 2. trademark tape; 3. support plate; 4. liquid discharge cylinder; 5. connecting head; 6. hose; 7. liquid discharge head; 8. liquid discharge cap; 9. lifting slide; 10. slider; 11. lifting screw; 12. mounting plate; 13. card-mounted slide; 14. first screw; 15. fixing block; 16. card-mounted slider; 17. second screw; 18. mixing barrel; 19. reduction motor; 20. rotating rod; 21. mixing blade; 22. feed port; 23. discharge port; 24. solenoid valve; 30. first chamber; 31. second chamber; 32. third chamber; 33. scraper. DETAILED DESCRIPTION

[0035] Example 1 Preparation of phosphorus flame retardant 1: Use a rotary evaporator to evaporate hypophosphorous acid in a 50°C water bath to remove the solvent. In an ice-water bath, add crystalline hypophosphorous acid and trimethyl orthoformate in a 1:1 ratio to a three-necked flask, turn on the magnetic stirrer, heat to room temperature, and react at this temperature for 1h, then distill under vacuum to remove methanol and methyl formate until a pale yellow solid powder is formed. In an ice-water bath, add 0.5 mol of acrylonitrile and 6g of catalyst triethylamine to the three-necked flask, heat to 50°C, and react for 1h. Then add 0.5 mol of hydrochloric acid, raise the temperature to 80°C, and react for 1h. After the reaction is completed, the solution is cooled, filtered to remove ammonium chloride, and then recrystallized in acetone / acetic acid to obtain the product flame retardant bis(2-carboxyethyl)phosphonic acid.

[0036] Phosphorus-based flame retardant 2 with ink affinity: A proper amount of polypropylene glycol (PPG 1000) was vacuum-dehydrated at 100°C for 3 hours, and a proper amount of 2,2-dihydroxymethylpropionic acid (DMPA) and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) were dried and dehydrated in an oven at 90-100°C for 3 hours. Take a certain amount of dried PPG 1000 in a 500 mL four-necked flask, heat the oil bath to 80°C, dissolve the dried DMPA with a small amount of 1-methyl-2-pyrrolidone (NMP) at 70°C, transfer it to the flask and stir to mix evenly, add the measured 2,4-toluene diisocyanate (TDI) drop by drop, then drop 0.05wt% dibutyltin dilaurate, keep the temperature at 80°C for 2h, add the measured ODOPB that has been dried in advance and dissolved in N, N-dimethylformamide (DMF), and react at 70°C for 2h to obtain the prepolymer. The temperature drops below 20°C, and a small amount of acetone is added during the reaction to adjust the viscosity. Add an appropriate amount of triethylamine at room temperature to neutralize until pH 6. Add deionized water to the prepolymer under high-speed stirring, and then add 2g of isophorone diamine (IPDA) after the addition is complete. Stir the reaction for 30min and stop emulsification. Acetone, a small amount of DMF and NMP solvents were removed by vacuum heating to obtain an emulsion of flame retardant modified waterborne polyurethane (FR-WPU).

[0037] Preparation of flame retardant coating adhesive: 85 parts of nylon waste, 70 parts of flame retardant 1 (nitrogen series), 14 parts of flame retardant 1 (phosphorus series), and 0.5 parts of penetrant were added to a beaker and stirred at 300r / min for 10 minutes to obtain flame retardant coating adhesive latex. Before use, add a measured thickener, increase the stirring speed to 1000r / min and stir for 5 minutes to increase the viscosity of the emulsion to the coating requirement.

[0038] First, pre-treat the base fabric and add 0.5g / L of penetrant during the desizing process; after the pre-treatment of the base fabric: The first flame retardant treatment: shaping process: flame retardant dosage 20%, temperature 170℃, vehicle speed 60m / min; two dips and two rolls, rolling pressure 2kg.

[0039] The second flame retardant treatment: coating process: flame retardant coating glue coating, the glue coating amount is 25g / m 2 →Bake (70℃, 2min) →Bake (150℃, 3min), scraper thickness 1mm.

[0040] The third flame retardant treatment: post-finishing padding process conditions: temperature 160℃, vehicle speed 40m / min, flame retardant 15%, padding pressure 2kg. After the flame retardant padding, it is dried in an anvil oven, the baking temperature is 140℃, and the baking time is 1min.

[0041] Example 2 Preparation of phosphorus flame retardant 1: Use a rotary evaporator to evaporate hypophosphorous acid in a 52°C water bath to remove the solvent. In an ice-water bath, add crystalline hypophosphorous acid and trimethyl orthoformate in a 1:2 ratio to a three-necked flask, turn on the magnetic stirrer, heat to room temperature, and react at this temperature for 1h, then distill under vacuum to remove methanol and methyl formate until a pale yellow solid powder is formed. In an ice-water bath, add 0.6 mol of acrylonitrile and 6 g of catalyst triethylamine to the three-necked flask, heat to 55°C, and react for 1 h. Then add 0.7 mol of hydrochloric acid, raise the temperature to 84°C, and react for 1h. After the reaction is completed, the solution is cooled, filtered to remove ammonium chloride, and then recrystallized in acetone / acetic acid to obtain the product flame retardant bis(2-carboxyethyl)phosphonic acid.

[0042] Phosphorus-based flame retardant 2 with ink affinity: An appropriate amount of polypropylene glycol (PPG 1000) was dehydrated in vacuum at 104°C for 3 h, and an appropriate amount of 2,2-dihydroxymethylpropionic acid (DMPA) and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) were dried and dehydrated in an oven at 90°C for 3 h. Take a certain amount of dried PPG 1000 in a 500 mL four-necked flask, heat the oil bath to 80°C, dissolve the dried DMPA with a small amount of 1-methyl-2-pyrrolidone (NMP) at 70°C, transfer it to the flask and stir to mix evenly, add the measured 2,4-toluene diisocyanate (TDI) drop by drop, then drop 0.05wt% dibutyltin dilaurate, keep the temperature at 80°C for 2h, add the measured ODOPB that has been dried in advance and dissolved in N, N-dimethylformamide (DMF), and react at 75°C for 2h to obtain the prepolymer. The temperature drops below 24°C, and a small amount of acetone is added during this period to adjust the viscosity. Add an appropriate amount of triethylamine at room temperature to neutralize until the pH is 6.5. Add deionized water to the prepolymer under high-speed stirring, and then add 2-3g of isophorone diamine (IPDA) after the addition is complete. Stir the reaction for 35min and stop emulsification. Acetone, a small amount of DMF and NMP solvents were removed by vacuum heating to obtain an emulsion of flame retardant modified waterborne polyurethane (FR-WPU).

[0043] Preparation of flame retardant coating adhesive: 86 parts of nylon waste, 75 parts of flame retardant 1 (nitrogen series), 16 parts of flame retardant 1 (phosphorus series), and 0.6 parts of penetrant were added to a beaker and stirred at 350r / min for 12 minutes to obtain flame retardant coating adhesive latex. Before use, add a measured amount of thickener, increase the stirring speed to 1200r / min, and stir for 6 minutes to increase the viscosity of the emulsion to the coating requirement.

[0044] First, pre-treat the base fabric and add 0.6g / L of penetrant during the desizing process; after the pre-treatment of the base fabric: The first flame retardant treatment: shaping process: flame retardant dosage 25%, temperature 175℃, vehicle speed 65m / min; two dips and two rolls, rolling pressure 2kg.

[0045] Second flame retardant treatment: coating process: flame retardant coating glue coating, the glue coating amount is 27g / m 2 →Bake (70℃, 4min) →Bake (157℃, 4min), scraper thickness 2mm.

[0046] The third flame retardant treatment: post-finishing padding process conditions: temperature 160℃, vehicle speed 50m / min, flame retardant 20%, padding pressure 2kg. After the flame retardant padding, it is dried in an anvil oven, the baking temperature is 150℃, and the baking time is 2min.

[0047] Example 3 Preparation of phosphorus flame retardant 1: Use a rotary evaporator to evaporate hypophosphorous acid in a 50°C water bath to remove the solvent. In an ice-water bath, add crystalline hypophosphorous acid and trimethyl orthoformate in a 1:1 ratio to a three-necked flask, turn on the magnetic stirrer, heat to room temperature, and react at this temperature for 3 hours, then distill under vacuum conditions to remove methanol and methyl formate until a light yellow solid powder is formed. In an ice-water bath, add 0.5 mol of acrylonitrile and 8 g of catalyst triethylamine to the three-necked flask, heat to 60°C, and react for 3 hours. Then add 0.8 mol of hydrochloric acid, raise the temperature to 90°C, and react for 3 hours. After the reaction is completed, the solution is cooled, filtered to remove ammonium chloride, and then recrystallized in acetone / acetic acid to obtain the product flame retardant bis(2-carboxyethyl)phosphonic acid.

[0048] Phosphorus-based flame retardant 2 with ink affinity: An appropriate amount of polypropylene glycol (PPG 1000) was vacuum-dehydrated at 110°C for 4 h, and an appropriate amount of 2,2-dihydroxymethylpropionic acid (DMPA) and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) were dried and dehydrated in an oven at 100°C for 4 h. Take a certain amount of dried PPG 1000 in a 500 mL four-necked flask, heat the oil bath to 90°C, dissolve the dried DMPA with a small amount of 1-methyl-2-pyrrolidone (NMP) at 80°C, transfer it to the flask and stir and mix evenly, add the measured 2,4-toluene diisocyanate (TDI) drop by drop, then drop 0.05wt% dibutyltin dilaurate, keep the temperature at 80°C for 4h, add the measured ODOPB that has been dried in advance and dissolved in N, N-dimethylformamide (DMF), and react at 80°C for 4h to obtain the prepolymer. The temperature drops below 30°C, and a small amount of acetone is added during the reaction to adjust the viscosity. Add an appropriate amount of triethylamine at room temperature to neutralize until pH 8. Add deionized water to the prepolymer under high-speed stirring, and then add 3g of isophorone diamine (IPDA) after the addition is completed. Stir the reaction for 40 min and stop emulsification. Acetone, a small amount of DMF and NMP solvents were removed by vacuum heating to obtain an emulsion of flame retardant modified waterborne polyurethane (FR-WPU).

[0049] Preparation of flame retardant coating adhesive: 85 parts of nylon waste, 70 parts of flame retardant 1 (nitrogen series), 14 parts of flame retardant 1 (phosphorus series), and 0.5 parts of penetrant were added to a beaker and stirred at 300 r / min for 10 minutes to obtain a flame retardant coating adhesive latex. Before use, a measured amount of thickener was added, and the stirring speed was increased to 1000 r / min and stirred for 5 minutes to increase the viscosity of the emulsion to the coating requirement.

[0050] First, pre-treat the base fabric and add 0.5g / L of penetrant during the desizing process; after the pre-treatment of the base fabric: The first flame retardant treatment: shaping process: flame retardant dosage 20%, temperature 170℃, vehicle speed 70m / min; two dips and two rolls, rolling pressure 3kg.

[0051] The second flame retardant treatment: coating process: flame retardant coating glue coating, the glue coating amount is 25g / m 2 →Bake (80℃, 5min) →Bake (160℃, 5min), scraper thickness 1mm.

[0052] The third flame retardant treatment: post-finishing padding process conditions: temperature 160℃, vehicle speed 40m / min, flame retardant 15%, padding pressure 2kg. After the flame retardant padding, it is dried in an anvil oven, the baking temperature is 140℃, and the baking time is 1min.

[0053] Example 4 Preparation of phosphorus flame retardant 1: Use a rotary evaporator to evaporate hypophosphorous acid in a 50°C water bath to remove the solvent. In an ice-water bath, add crystalline hypophosphorous acid and trimethyl orthoformate in a 1:1 ratio to a three-necked flask, turn on the magnetic stirrer, heat to room temperature, and react at this temperature for 1h, then distill under vacuum conditions to remove methanol and methyl formate until a light yellow solid powder is formed. In an ice-water bath, add 0.5 mol of acrylonitrile and 6 g of catalyst triethylamine to the three-necked flask, heat to 50°C, and react for 1h. Then add 0.5 mol of hydrochloric acid, raise the temperature to 80°C, and react for 1h. After the reaction is completed, the solution is cooled, filtered to remove ammonium chloride, and then recrystallized in acetone / acetic acid to obtain the product flame retardant bis(2-carboxyethyl)phosphonic acid.

[0054] Phosphorus-based flame retardant 2 with ink affinity: A proper amount of polypropylene glycol (PPG 1000) was dehydrated in vacuum at 100°C for 3 h, and a proper amount of 2,2-dihydroxymethylpropionic acid (DMPA) and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) were dried and dehydrated in an oven at 90°C for 3 h. Take a certain amount of dried PPG 1000 in a 500 mL four-necked flask, heat the oil bath to 80°C, dissolve the dried DMPA with a small amount of 1-methyl-2-pyrrolidone (NMP) at 70°C, transfer it to the flask and stir and mix evenly, add the measured 2,4-toluene diisocyanate (TDI) drop by drop, then drop 0.05wt% dibutyltin dilaurate, keep the temperature at 80°C for 2h, add the measured ODOPB that has been dried in advance and dissolved in N, N-dimethylformamide (DMF), and react at 70°C for 2h to obtain the prepolymer. The temperature drops below 20°C, and a small amount of acetone is added during the reaction to adjust the viscosity. Add an appropriate amount of triethylamine at room temperature to neutralize until pH 6. Add deionized water to the prepolymer under high-speed stirring, and then add 2g of isophorone diamine (IPDA) after the addition is complete. Stir the reaction for 30min and stop emulsification. Acetone, a small amount of DMF and NMP solvents were removed by vacuum heating to obtain an emulsion of flame retardant modified waterborne polyurethane (FR-WPU).

[0055] Preparation of flame retardant coating adhesive: 85 parts of nylon waste, 70 parts of flame retardant 1 (nitrogen series), 14 parts of flame retardant 1 (phosphorus series), and 0.5 parts of penetrant were added to a beaker and stirred at 300 r / min for 10 minutes to obtain a flame retardant coating adhesive latex. Before use, a measured amount of thickener was added, and the stirring speed was increased to 1000 r / min and stirred for 5 minutes to increase the viscosity of the emulsion to the coating requirement.

[0056] First, pre-treat the base fabric and add 0.5g / L of penetrant during the desizing process; after the pre-treatment of the base fabric: The first flame retardant treatment: shaping process: flame retardant dosage 20%, temperature 170℃, vehicle speed 60m / min; two dips and two rolls, rolling pressure 3kg.

[0057] The second flame retardant treatment: coating process: flame retardant coating glue coating, the glue coating amount is 25g / m 2 →Bake (70℃, 2min) →Bake (150℃, 3min), scraper thickness 1mm.

[0058] The third flame retardant treatment: post-finishing padding process conditions: temperature 160℃, vehicle speed 40m / min, flame retardant 15%, padding pressure 2kg. After the flame retardant padding, it is dried in an anvil oven, the baking temperature is 140℃, and the baking time is 1min.

[0059] like Figures 1 to 4 As shown, the present embodiment adopts a flame retardant trademark tape coating device designed by the inventor during coating, including a support plate 3, a top beam 1 and a trademark tape 2 are respectively arranged at the top and bottom of the trademark tape production device, the bottom end of the top beam 1 is connected to the top end of the support plate 3, a mounting assembly is arranged at the right end of the support plate 3, a sliding fixing assembly is arranged at the right side of the mounting assembly, a gluing assembly is arranged at the bottom end of the sliding fixing assembly, a flame retardant liquid stirring assembly is arranged at the top of the top beam 1, the gluing assembly includes a liquid discharge cylinder 4, a connecting head 5, a hose 6 and a liquid discharge cap 8, a first chamber 30 is arranged inside the liquid discharge cylinder 4, a connecting threaded hole is arranged at the top of the liquid discharge cylinder 4, a first thread is arranged on the top outer wall of the connecting head 5, the connecting threaded hole is threadedly connected to the bottom of the connecting head 5, the top of the connecting head 5 is connected to the bottom end of the hose 6, and the liquid discharge A liquid discharge head 7 is provided at the bottom end of the cylinder 4, a second thread is provided on the bottom outer wall of the liquid discharge head 7, a discharge hole is provided at the top of the liquid discharge cap 8, a third thread is provided at the top inner end of the discharge hole, the discharge hole is threadedly connected with the liquid discharge head 7, and a lifting scraper assembly is provided at the right end of the liquid discharge cylinder 4; first, the liquid discharge cylinder is installed on the support plate through the installation assembly and the sliding fixing assembly, and then a suitable liquid discharge cap is selected, and then installed at the liquid discharge head of the liquid discharge cylinder, and then the flame retardant liquid stirring assembly injects the flame retardant liquid into the liquid discharge cylinder through a hose, and then the flame retardant liquid drips onto the trademark tape through the liquid discharge cylinder, the liquid discharge head and the liquid discharge cap, and then the excess flame retardant liquid on the trademark tape is scraped off by the lifting scraper assembly, and evenly laid on the trademark tape, so as to control the thickness and uniformity of the flame retardant liquid on the trademark tape, thereby enhancing practicality.

[0060] The present invention discloses a flame-retardant trademark tape coating device, wherein the lifting scraper assembly comprises a lifting slide 9, a slider 10, a lifting screw 11 and a scraper 33, the right end of the liquid discharge cylinder 4 is connected to the left end of the lifting slide 9, a second chamber 31 is arranged inside the lifting slide 9, the lifting slide 9 and the slider 10 are slidably fitted, a lifting through-threaded hole is arranged at the top of the lifting slide 9, the lifting through-threaded hole is threadedly connected to the lifting screw 11, the bottom end of the lifting screw 11 is connected to the top bearing of the slider 10, and the bottom end of the slider 10 is connected to the top of the scraper 33; when adjusting the scraper height, the slider can be driven to move up and down by rotating the lifting screw, so as to adjust the scraper height at the bottom end of the slider, thereby enhancing practicality.

[0061] The present invention provides a flame-retardant trademark coating device, wherein the mounting assembly includes two groups of first screws 14, two groups of first threaded holes are arranged at the right end of the support plate 3, a clamping slide groove 13 is arranged at the right end of the mounting plate 12, two groups of first through holes are arranged at the left end of the clamping slide groove 13, and the two groups of first screws 14 are threadedly connected with the first threaded holes through the first through holes respectively; the mounting plate can be mounted on the support plate by the two groups of first screws, thereby installing the liquid discharge cylinder, thereby enhancing practicality.

[0062] The present invention discloses a flame-retardant trademark belt coating device, wherein a sliding fixing component comprises a fixing block 15, a clamping slide block 16 and two groups of second screws 17; the top end of a liquid discharge cylinder 4 is connected to the bottom end of the fixing block 15, the left end of the liquid discharge cylinder 4 is connected to the right end of the clamping slide block 16, the clamping slide block 16 is slidably clamped with a clamping slide groove 13, two groups of second through holes are arranged at the right end of the fixing block 15, two groups of second threaded holes are arranged at the right end of a supporting plate 3, and the two groups of second screws 17 are respectively threadedly connected with the second threaded holes through the second through holes; the liquid discharge cylinder and the mounting plate can be slidably clamped together through the clamping slide groove and the clamping slide block, and then the fixing block and the liquid discharge cylinder are fixed through the two groups of second screws, thereby enhancing practicality.

[0063] The flame retardant trademark belt coating equipment of the present invention comprises a flame retardant liquid stirring assembly comprising a stirring drum 18, a reduction motor 19 and a rotating rod 20, the top end of the top beam 1 is connected to the bottom end of the stirring drum 18, the top end of the stirring drum 18 is connected to the bottom end of the reduction motor 19, a third chamber 32 is arranged in the stirring drum 18, the output end bearing seal of the reduction motor 19 is inserted into the third chamber 32, the bottom end of the reduction motor 19 is connected to the top end of the rotating rod 20, a stirring blade 21 is arranged at the bottom of the rotating rod 20, a feed port 22 is arranged at the left end of the stirring drum 18, a discharge port 23 is arranged at the bottom end of the stirring drum 18, the bottom end seal of the discharge port 23 passes through the bottom end of the top beam 1, and the discharge port 23 is communicated with the top end of the hose 6; the flame retardant liquid can be injected into the third chamber through the feed port, and then the rotating rod and the stirring blade are driven to rotate by the reduction motor, and then the flame retardant liquid in the third chamber is mixed and stirred, so that the flame retardant liquid in the third chamber is stirred, so as to maintain the fluidity of the flame retardant liquid, thereby enhancing practicality.

[0064] In the flame-retardant trademark tape coating device of the present invention, a solenoid valve 24 is provided at the right end of the bottom of the discharge port 23; the discharge port can be opened and closed by the solenoid valve, thereby enhancing practicality.

[0065] In the flame-retardant trademark tape coating device of the present invention, the two groups of first through holes and the two groups of second through holes are both configured as countersunk holes; the two groups of first screws and the two groups of second screws can be hidden by using the countersunk holes, thereby enhancing practicality.

[0066] In the flame-retardant trademark coating device of the present invention, the two groups of first screws 14 and the two groups of second screws 17 are coated with screw glue on the threads; the screw glue can be used to strengthen the fixation of the two groups of first screws and the two groups of second screws, thereby enhancing practicality.

[0067] The flame retardant trademark tape coating device of the present invention, when working, firstly installs the mounting plate on the supporting plate by two groups of first screws, then slides and clamps the liquid discharge cylinder and the mounting plate by the clamping slide groove and the clamping slider, then fixes the fixing block on the supporting plate by two groups of second screws, then selects a suitable liquid discharge cap, then adjusts the height of the slider and the scraper by rotating the lifting screw, then installs them at the liquid discharge head of the liquid discharge cylinder, then starts the reduction motor, the reduction motor drives the rotating rod and the stirring blade to mix and stir the flame retardant liquid in the third chamber, then the solenoid valve is opened, and the flame retardant liquid is injected into the liquid discharge cylinder through the hose, then the flame retardant liquid drips onto the trademark tape through the liquid discharge cylinder, the liquid discharge head and the liquid discharge cap, then the excess flame retardant liquid on the trademark tape is scraped off by the scraper, and the scraped flame retardant liquid is evenly laid on the trademark tape.

[0068] Comparative Example 1 Preparation of phosphorus flame retardant: Use a rotary evaporator to evaporate hypophosphorous acid in a 50°C water bath to remove the solvent. In an ice-water bath, add crystalline hypophosphorous acid and trimethyl orthoformate in a 1:1 ratio to a three-necked flask, turn on the magnetic stirrer, heat to room temperature, and react at this temperature for 1-3 hours, then distill under vacuum to remove methanol and methyl formate until a pale yellow solid powder is formed. In an ice-water bath, add 0.5 mol of acrylonitrile and 6g of catalyst triethylamine to the three-necked flask, heat to 50°C, and react for 1 hour. Then add 0.5 mol of hydrochloric acid, raise the temperature to 80°C, and react for 1 hour. After the reaction is completed, the solution is cooled, filtered to remove ammonium chloride, and then recrystallized in acetone / acetic acid to obtain the product flame retardant bis(2-carboxyethyl)phosphonic acid.

[0069] Preparation of flame retardant coating adhesive: 85 parts of nylon waste, 70 parts of flame retardant 1 (nitrogen series), 14 parts of flame retardant 1 (phosphorus series), and 0.5 parts of penetrant are added to a beaker and stirred at 300-500r / min for 10 minutes to obtain a flame retardant coating adhesive latex. Before use, add a measured amount of thickener, increase the stirring speed to 1000 r / min, and stir for 5 minutes to increase the viscosity of the emulsion to the coating requirement.

[0070] First, pre-treat the base fabric and add 0.5-1g / L of penetrant during the desizing process; after the pre-treatment of the base fabric: The first flame retardant treatment: shaping process: flame retardant dosage 20%, temperature 170℃, vehicle speed 60m / min; two dips and two rolls, rolling pressure 2kg.

[0071] The second flame retardant treatment: coating process: flame retardant coating glue coating, the glue coating amount is 25g / m 2 →Bake (70℃, 2min) →Bake (150℃, 3min), scraper thickness 1mm.

[0072] The third flame retardant treatment: post-finishing padding process conditions: temperature 160℃, vehicle speed 40m / min, flame retardant 15%, padding pressure 2kg. After the flame retardant padding, it is dried in an anvil oven, the baking temperature is 140℃, and the baking time is 1min.

[0073] Comparative Example 2 Phosphorus-based flame retardant 2 with ink affinity: A proper amount of polypropylene glycol (PPG 1000) was dehydrated in vacuum at 100°C for 3 h, and a proper amount of 2,2-dihydroxymethylpropionic acid (DMPA) and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) were dried and dehydrated in an oven at 90°C for 3 h. Take a certain amount of dried PPG 1000 in a 500 mL four-necked flask, heat the oil bath to 80°C, dissolve the dried DMPA with a small amount of 1-methyl-2-pyrrolidone (NMP) at 70°C, transfer it to the flask and stir and mix evenly, add the measured 2,4-toluene diisocyanate (TDI) drop by drop, then drop 0.05wt% dibutyltin dilaurate, keep the temperature at 80°C for 2h, add the measured ODOPB that has been dried in advance and dissolved in N, N-dimethylformamide (DMF), and react at 70°C for 2h to obtain the prepolymer. The temperature drops below 20°C, and a small amount of acetone is added during the reaction to adjust the viscosity. Add an appropriate amount of triethylamine at room temperature to neutralize until pH 6. Add deionized water to the prepolymer under high-speed stirring, and then add 2g of isophorone diamine (IPDA) after the addition is complete. Stir the reaction for 30min and stop emulsification. Acetone, a small amount of DMF and NMP solvents were removed by vacuum heating to obtain an emulsion of flame retardant modified waterborne polyurethane (FR-WPU).

[0074] Preparation of flame retardant coating adhesive: 85 parts of nylon waste, 80 parts of flame retardant 1 (nitrogen series), 14 parts of flame retardant 1 (phosphorus series), and 0.5 parts of penetrant are added to a beaker and stirred at 300-500r / min for 15 minutes to obtain flame retardant coating adhesive latex. Before use, add a measured amount of thickener, increase the stirring speed to 1500r / min, and stir for 10 minutes to increase the viscosity of the emulsion to the coating requirements.

[0075] First, pre-treat the base fabric and add 1g / L of penetrant during the desizing process; after the pre-treatment of the base fabric: The first flame retardant treatment: shaping process: flame retardant dosage 20%, temperature 170℃, vehicle speed 70m / min; two dips and two rolls, rolling pressure 3kg.

[0076] The second flame retardant treatment: coating process: flame retardant coating glue coating, the glue coating amount is 25g / m 2 →Bake (80℃, 2min) →Bake (160℃, 3min), scraper thickness 1mm.

[0077] The third flame retardant treatment: post-finishing padding process conditions: temperature 170℃, vehicle speed 50m / min, flame retardant 15%, padding pressure 2kg. After the flame retardant padding, it is dried in an anvil oven, the baking temperature is 140℃, and the baking time is 2min.

[0078] The nylon base fabric flame retardant trademark tapes obtained in Examples 1 to 4 and comparative examples 1 and 2 were tested. The specific testing method is as follows: Flame retardant test Fire test is performed in accordance with FMVSS 302 standard.

[0079] Sample treatment: Place the test samples at 21°C and 50% relative humidity for 24 hours before testing.

[0080] Test method: After igniting the flame of the sample for 15 seconds, remove the fire source and start timing when the flame of the sample burns to the 38mm mark.

[0081] Calculation formula: B=60×(D / T); where: B is the burning rate (mm / min); D is the burning length (mm); T is the time (seconds).

[0082] Color fastness Refer to GB / T 3921-2008 "Textiles - Tests for colour fastness - Colour fastness to washing with soap" and GB / T 3920-1997 "Textiles - Tests for colour fastness - Colour fastness to rubbing" to test the colour fastness of fabrics to washing with soap and colour fastness to rubbing.

[0083] Printing method Printing is carried out in accordance with the national standard "National Standard of the People's Republic of China: Offset Printing Paper (GB / T 30130-2013)".

[0084] Table 1 Burning rate

[0085] As shown in Table 1, the combustion rate of the embodiment meets FMVSS 302 (no combustion or horizontal combustion speed on the flame does not exceed 102mm / min), and the effect is very good, the combustion rate is 0mm / min, and the flame retardant FR-WPU not only forms a large amount of carbon covering the surface of the material during thermal decomposition, but also releases inert gas, thereby diluting the combustible gas released by the material and the oxygen in the air. The gas phase and condensed phase flame retardancy are carried out simultaneously. When the two work together to play the best role, the flame retardant effect is optimal, so the flame retardant saturation phenomenon occurs. The flame retardant elements present in the flame retardant bis (2-carboxyethyl) phosphonic acid promote the initial decomposition temperature of nylon to drop, so that nylon decomposes at a lower temperature, reduces the generation of molten droplets, and promotes the formation of a carbon layer. The formed carbon layer provides good protection for the material, blocks the exchange of combustible gases, blocks heat conduction and heat radiation, slows down the rate of flame spread, and improves the flame retardant properties of the material.

[0086] Table 2 Color fastness to dry rubbing / grade

[0087] Table 3 Color fastness to wet rubbing / grade

[0088] Table 4 Water fastness

[0089] After finishing, the breaking tensile strength and tearing strength of the trademark tape will be strengthened, because the flame retardant coating glue forms a film on the surface of the fabric after heat setting, thereby enhancing the strength of the finished fabric. When the baking time is fixed, the breaking strength and breaking strength of the fabric will decrease significantly with the increase of baking temperature. However, the tearing strength does not change; when the baking temperature is fixed, the breaking strength and breaking strength of the fabric will decrease slightly with the increase of baking time, but the tearing strength will increase with the increase of baking time. Because the presence of the penetrant makes the interaction between the flame retardant coating glue and the base fabric stronger, the washing resistance after coating finishing is improved.

[0090] Table 5 Printing method

[0091] As shown in Table 5, compared with the comparative example, the embodiment of the present invention is in line with the ink printing method, and the waterborne polyurethane (FR-WPU) is a new polyurethane system with affinity to ink. However, the comparative example is not in line with the ink printing method.

[0092] It can be seen from the above comparison data that the product of the embodiment of the present invention has excellent printing performance, flame retardant performance and water washability; and when washed with water, the flame retardant performance is still maintained; and the printed font will not be washed away.

[0093] Furthermore, as can be seen from the comparison of the printed photo 6 of the trademark tape of Example 1 and the printed photo 7 of the trademark tape of Comparative Example 1, the flame-retardant trademark tape of the present invention is printed clearly, while the printed font of the trademark tape of the comparative example is blurred.

[0094] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art can make non-creative modifications to the present embodiment as needed, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A process for preparing a nylon base fabric flame retardant trademark tape, characterized in that Including the pre-treatment, shaping, coating and post-finishing processes of the base fabric, and multiple flame retardant treatments; The specific implementation plan is as follows: 1) Pre-treatment and shaping of base fabric The base fabric is made of pure nylon thick base fabric. First, the base fabric is pre-treated and 0.5-1g / L of penetrant is added during the desizing process. After the pre-treatment of the base fabric, the base fabric is shaped and the first flame retardant treatment is performed. During the shaping process, the base fabric is dipped in a phosphorus flame retardant with penetrant added. 2) Preparation of flame retardant rubber and coating treatment process The second flame retardant treatment is the flame retardant coating glue coating treatment; The flame retardant rubber material is made of nylon waste silk, phosphorus flame retardant, nitrogen flame retardant and penetrant; the coating rubber formula includes: nylon waste silk, nitrogen flame retardant 1, phosphorus flame retardant 2 and penetrant; 3) Ink absorption of flame retardant thick label tape In the third flame retardant treatment of the post-finishing process, a phosphorus-based flame retardant with affinity to ink is selected for impregnation treatment of the coated cloth, and after impregnation with the flame retardant, it is dried in an anvil oven.

2. The process for preparing a nylon base fabric flame retardant trademark tape according to claim 1, characterized in that: In step 1, the shaping process: the amount of flame retardant is 20-30%, the temperature is 170-180°C, the vehicle speed is 60-70m / min; two dips and two rolls, and the rolling pressure is 2-3kg.

3. The process for preparing a nylon base fabric flame retardant trademark tape according to claim 1, characterized in that: Preparation of flame retardant coating adhesive in step 2: 85-90 parts of nylon waste silk, 70-80 parts of flame retardant 1 (nitrogen series), 14-20 parts of flame retardant 1 (phosphorus series), and 0.5-1 part of penetrant are added into a beaker and stirred at a speed of 300-500r / min for 10-15min to obtain a flame retardant coating adhesive latex; before use, add a measured amount of thickener, increase the stirring speed to 1000-1500r / min and stir for 5-10min to increase the viscosity of the emulsion to the coating requirement.

4. The process for preparing a nylon base fabric flame retardant trademark tape according to claim 3, characterized in that: Coating process: flame retardant coating glue coating, the coating amount is 25-30g / m 2 →Bake (70-80℃, 2-5min) →Bake (150-160℃, 3-5min), scraper thickness 1-2mm.

5. The process for preparing a nylon base fabric flame retardant trademark tape according to claim 1, characterized in that: The penetrant is fatty alcohol polyoxyethylene ether.

6. The process for preparing a nylon base fabric flame retardant trademark tape according to claim 3, characterized in that: Preparation of phosphorus flame retardant 1: Use a rotary evaporator to evaporate hypophosphorous acid in a water bath at 50-60°C to remove the solvent therein; In an ice-water bath, add crystalline hypophosphorous acid and trimethyl orthoformate in a ratio of 1:1-1:5 to a three-necked flask, turn on a magnetic stirrer, heat to room temperature, and react at this temperature for 1-3 hours, then distill under vacuum conditions to remove methanol and methyl formate until a light yellow solid powder is formed; in an ice-water bath, add 0.5-1 mol of acrylonitrile and 6-8 g of catalyst triethylamine to the three-necked flask, heat to 50-60°C, and react for 1-3 hours; then add 0.5-0.8 mol of hydrochloric acid, raise the temperature to 80-90°C, and react for 1-3 hours; after the reaction, cool the solution, filter to remove ammonium chloride, and then recrystallize in acetone / acetic acid to obtain the product flame retardant bis(2-carboxyethyl)phosphonic acid.

7. The process for preparing a nylon base fabric flame retardant trademark tape according to claim 1, characterized in that: Preparation of phosphorus-based flame retardant 2 with ink affinity in step 4: vacuum dehydration of appropriate amount of polypropylene glycol (PPG 1000) at 100-110°C for 3-4h, drying and dehydration of appropriate amount of 2,2-dimethylolpropionic acid (DMPA) and 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) in a 90-100°C oven for 3-4h; taking a certain amount of dried PPG 1000 in a 500mL four-necked flask, heating the oil bath to 80-90°C, dissolving the dried DMPA with a small amount of 1-methyl-2-pyrrolidone (NMP) at 70-80°C, transferring it to a flask and stirring to mix evenly, adding a measured amount of 2,4-toluene diisocyanate (TDI) drop by drop, and then dropping 0.05-0.1wt% Dibutyltin dilaurate is kept at 80-90℃ for reaction for 2-4h, then ODOPB which has been dried in advance and dissolved in N,N-dimethylformamide (DMF) is added, and the reaction is carried out at 70-80℃ for 2-4h to obtain a prepolymer; the temperature is reduced to below 20-30℃, during which a small amount of acetone is added to adjust the viscosity; an appropriate amount of triethylamine is added at room temperature for neutralization until the pH is 6-8; deionized water is added dropwise to the prepolymer under high-speed stirring, and after the addition is completed, 2-3g of isophoronediamine (IPDA) is added dropwise thereto, and the emulsification is stopped after stirring for 30-40 min; acetone, a small amount of DMF and NMP solvent are removed by vacuum heating to obtain an emulsion of flame-retardant modified waterborne polyurethane (FR-WPU).

8. The process for preparing a nylon base fabric flame retardant trademark tape according to claim 1, characterized in that: Post-finishing padding process conditions: temperature 160-170℃, vehicle speed 40-50m / min, flame retardant 15-20%, padding pressure 2-3kg; after flame retardant padding, it is dried in an anvil oven, the baking temperature is 140℃-150℃, and the baking time is 1-2min.

9. A process for preparing a nylon-based flame-retardant trademark tape according to any one of claims 1 to 8, characterized in that: During the coating treatment, a flame retardant trademark tape coating device is used, comprising a support plate (3), a top beam (1) and a trademark tape (2) are respectively arranged at the top and bottom of the trademark tape production device, the bottom end of the top beam (1) is connected to the top end of the support plate (3), a mounting assembly is arranged at the right end of the support plate (3), a sliding fixing assembly is arranged at the right side of the mounting assembly, a gluing assembly is arranged at the bottom end of the sliding fixing assembly, and a flame retardant liquid stirring assembly is arranged at the top end of the top beam (1); the gluing assembly comprises a liquid outlet cylinder (4), a connecting head (5), a hose (6) and a liquid outlet cap (8), and the inside of the liquid outlet cylinder (4) A first chamber (30) is provided, a connecting threaded hole is provided at the top of the liquid discharge cylinder (4), a first thread is provided on the top outer wall of the connecting head (5), the connecting threaded hole is threadedly connected to the bottom of the connecting head (5), the top of the connecting head (5) is connected to the bottom end of the hose (6), a liquid discharge head (7) is provided at the bottom end of the liquid discharge cylinder (4), a second thread is provided on the bottom outer wall of the liquid discharge head (7), a discharge hole is provided at the top of the liquid discharge cap (8), a third thread is provided at the top inner end of the discharge hole, the discharge hole is threadedly connected to the liquid discharge head (7), and a lifting scraper assembly is provided at the right end of the liquid discharge cylinder (4).

10. The process for preparing a nylon base fabric flame retardant trademark tape according to claim 9, characterized in that: The lifting scraper assembly comprises a lifting slide (9), a slider (10), a lifting screw (11) and a scraper (33); the right end of the liquid discharge cylinder (4) is connected to the left end of the lifting slide (9); a second chamber (31) is arranged inside the lifting slide (9); the lifting slide (9) and the slider (10) are slidably fitted together; a lifting through threaded hole is arranged at the top of the lifting slide (9); the lifting through threaded hole is threadedly connected to the lifting screw (11); the bottom end of the lifting screw (11) is connected to the top bearing of the slider (10); and the bottom end of the slider (10) is connected to the top of the scraper (33).

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