Halogen-free flame-retardant cloth belt and preparation method thereof

Abstract

The present application belongs to the technical field of manufacturing flame-retardant cloth, and particularly relates to a halogen-free flame-retardant cloth tape and a preparation method thereof. The present application adds inorganic flame retardants and phosphorus flame retardants into polypropylene, permanently fixes the flame-retardant components in the fiber by melt spinning, solves the problem of easy dropping of the flame retardants caused by the preparation of the flame-retardant cloth tape by impregnating the flame retardants, introduces more carbon elements by taking triethanolamine as an alkali source, modifies the hydrotalcite by doping lanthanum, and prepares the modified flame-retardant adjuvant by modifying the hydrotalcite surface by A-151. The waterproof coating prepared by polymerization of KH-560 and polydimethylsiloxane has excellent adhesion. The spraying of the silica sol makes the coating surface form the micro-nano structure protrusions, and improves the waterproof performance and crack resistance of the coating surface. The flame-retardant cloth tape prepared by the present application is free of halogen elements, does not contain heavy metals, glass fibers and asbestos components, is friendly to the environment, has excellent flame-retardant performance and elasticity, and can be tightly and compactly wrapped without cracking when applied to the flame-retardant cable.

Description

Technical Field

[0001] This invention belongs to the field of flame retardant fabric manufacturing technology, specifically relating to a halogen-free flame retardant fabric tape and its preparation method. Background Technology

[0002] Existing flame-retardant fabric tapes coated with halogenated flame-retardant materials have excellent flame-retardant properties. However, in fires, traditional halogenated flame-retardant materials produce large amounts of corrosive and toxic smoke, which poses serious threats to human health and the natural environment. Therefore, it is of great significance to develop halogen-free flame-retardant fabric tapes with good flame-retardant effects and less harm to the human body.

[0003] Chinese invention patent CN118029145B discloses a flame-retardant fabric, its preparation method, and its application. The method includes: (1) reacting diethylenetriamine, vinylsilane, and an epoxy-containing silane in a first contact reaction to obtain diethylenetriamine-silane; (2) diluting the diethylenetriamine-silane in solvent I to adjust the pH and obtain a diethylenetriamine-silane solution, then immersing the fabric in the diethylenetriamine-silane solution for a first soaking to obtain a flame-retardant fabric I; (3) reacting tetramethylphosphosulfate, urea, and water in a second contact reaction to obtain a prepolymerized tetramethylphosphosulfate flame retardant; and (4) immersing the flame-retardant fabric I in the prepolymerized tetramethylphosphosulfate flame retardant for a second soaking to obtain a flame-retardant fabric. The flame-retardant fabric prepared by the method provided by this invention exhibits excellent flame-retardant properties. The method is simple and efficient, requires no gas participation in the reaction, is low-cost, and suitable for mass production. However, existing technologies have not addressed the technical problem of improving the flame-retardant properties of flame-retardant tapes by further modifying the flame-retardant composition of the tapes. Summary of the Invention

[0004] The purpose of this invention is to provide a halogen-free flame-retardant fabric tape and its preparation method, which solves the technical problem in the prior art that the flame-retardant performance of the flame-retardant fabric tape has not been improved by further modifying the flame-retardant composition of the flame-retardant fabric tape.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A halogen-free flame-retardant fabric tape includes a flame-retardant fabric tape and a waterproof coating on the surface; The flame-retardant fabric tape is made from the following raw materials in parts by weight: 85-95 parts polypropylene resin, 3-6 parts inorganic flame retardant, 1-2.5 parts antioxidant, 1-2.5 parts lubricant, 5-10 parts phosphorus-based flame retardant, 0.001-0.003 parts nucleating agent and 0.001-0.002 parts antistatic agent; The antioxidant is one or more combinations of antioxidant 1010, antioxidant 168, and antioxidant 2246; The lubricant is one or more combinations of stearic acid, ethylene bis-stearamide, and polyethylene wax; The nucleating agent is a sorbitol-based nucleating agent; The antistatic agent is one or more combinations of glyceryl monostearate, cocoyl diethanolamine and polyethylene glycol ester; Phosphorus-based flame retardants are prepared by mixing ammonium polyphosphate and melamine polyphosphate in a mass ratio of 1 to 2:1.

[0006] A method for preparing a halogen-free flame-retardant fabric tape includes the following steps: S1. Mix the raw materials required for flame-retardant fabric tape to obtain a mixture, add the mixture to an extruder to melt and obtain a spinning solution, spray out the yarn, cool and solidify at room temperature, pull and oil it, cool to room temperature, wind and collect it to obtain flame-retardant fibers, and weave the flame-retardant fibers into flame-retardant fabric tape. S2. The flame-retardant fabric tape is immersed in a cleaning solution for cleaning, dried, and then waterproofed to obtain a waterproof coating. It is then leveled, rolled up, cut, and packaged to obtain halogen-free flame-retardant fabric tape.

[0007] Preferably, in S1, the melting temperature is 180~260℃, the spray orifice diameter is 0.1~0.5mm, the temperature of the stretching roller is 120~140℃, the stretching ratio is 1.1~1.15, and the spinning oil is oleate.

[0008] Preferably, the cleaning solution in S2 is prepared by mixing 2-5g of dodecyl alcohol polyoxyethylene ether, 1L of deionized water and 1-2g of sodium hydroxide, heated to 60-70℃ for 20-30 minutes, and dried at 50-60℃.

[0009] The preparation method of the inorganic composite flame retardant includes the following steps: S11. Lanthanum nitrate, aluminum nitrate and magnesium nitrate were added to deionized water, triethanolamine was added dropwise, the mixture was heated to a hydrothermal reaction, the solid was collected by filtration, washed and dried to obtain modified hydrotalcite. S12. Modified hydrotalcite was added to a 50wt% ethanol aqueous solution, A-151 was added, the mixture was heated to react, the solid was collected by filtration, washed, and dried to obtain a modified flame retardant additive. The modified flame retardant additive was then mixed with zinc borate to obtain an inorganic composite flame retardant.

[0010] Preferably, in S11, the mass ratio of deionized water, lanthanum nitrate, aluminum nitrate, and magnesium nitrate is 100~150:2.6~3.3:5.5~6.5:11.1~11.8, the amount of triethanolamine added is 20~30% of the mass of deionized water, the temperature is raised to 90~100℃ and reacted for 1~2 hours, washed with deionized water, and dried at 50~60℃; Preferably, the mass ratio of modified hydrotalcite, A-151 and 50wt% aqueous ethanol in S12 is 4~6:1~3:15~20. The reaction is carried out at 70~75℃ for 1~2 hours, washed sequentially with deionized water and ethanol, and dried at 50~60℃. The mass ratio of modified flame retardant additive and zinc borate is 1~2:4~6, and the average particle size of zinc borate is 2~4μm.

[0011] The waterproofing process in S2 includes the following steps: S21. KH-560 is added to deionized water for hydrolysis, followed by vacuum distillation and the addition of polydimethylsiloxane. Tetramethylammonium hydroxide catalyst is added under a nitrogen atmosphere, the reaction is heated, deionized water is added to adjust the concentration, and the waterproof coating is obtained by vacuum distillation. S22. Add the amino curing agent to the waterproof coating, impregnate the flame-retardant cloth tape, scrape off the excess liquid, dry at room temperature, then spray on the silica sol, and heat to cure to obtain the waterproof coating.

[0012] Preferably, the mass ratio of KH-560, polydimethylsiloxane and tetramethylammonium hydroxide catalyst in S21 is 5~10:100:0.4~0.5, the temperature is raised to 110~120℃ and the reaction is carried out for 1~3 hours, and deionized water is added to adjust the concentration to 15~25wt%.

[0013] Preferably, in step S22, the amount of amino curing agent added is 5-10 wt% of the waterproof coating mass, and the amount of silica sol sprayed is 7-10 g / m³. 3 Heat to 100~110℃ and cure for 1~2 hours.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention solves the problem of flame retardant detachment caused by impregnating flame retardants with polypropylene by adding inorganic and phosphorus-based flame retardants to polypropylene and permanently fixing the flame retardant components inside the fibers through melt spinning. Using polypropylene as the substrate provides excellent tensile strength and elongation. The waterproof coating, obtained by polymerization of KH-560 and polydimethylsiloxane, forms an organosilicon network on the surface of the flame retardant tape with excellent adhesion. Spraying silica sol creates micro-nano structure protrusions on the coating surface, improving the waterproof and crack-resistant properties of the coating. The flame retardant tape prepared by this invention is free of halogens, heavy metals, glass fiber, and asbestos, making it environmentally friendly. It possesses excellent flame retardant properties and elasticity, and can be tightly wrapped around flame-retardant cables without cracking.

[0015] 2. This invention uses triethanolamine as an alkali source, lanthanum-doped modified hydrotalcite, and A-151 modified hydrotalcite surface to prepare a modified flame retardant additive. Triethanolamine introduces more carbon elements, and lanthanum can catalyze the formation of a carbon layer in polypropylene during combustion. This allows the modified hydrotalcite to synergistically form a carbon layer with phosphorus-based flame retardants during combustion to isolate heat conduction. Vinyl groups are introduced through the surface of A-151 modified hydrotalcite, enabling the hydrotalcite to be uniformly dispersed and fixed in the polypropylene substrate. The modified flame retardant additive and zinc borate can synergistically generate a low-temperature ceramic phase during combustion, preventing the fabric tape from burning and dripping.

[0016] 3. The waterproof coating prepared by KH-560 and polydimethylsiloxane polymerization is based on organosilicon and has excellent flexibility and hydrophobicity. The epoxy groups are introduced into the organosilicon resin and cross-linked with the amino curing agent to improve the adhesion of the coating. The coating surface is combined with fine inorganic silicon by spraying silica sol, which improves the overall hardness and wear resistance of the coating. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] The polypropylene involved in this invention has a melt index of 3.5 g / 10 min and a tensile strength greater than 31 MPa; the nucleating agent is NA-JS03 sorbitol-based nucleating agent; the amino curing agent is T-31; the silica sol is ZS-25; the silica content is 25%; the average particle size is 15 nm; the pH is 7; and the sodium oxide content is 0.1 wt%.

[0019] Example 1: A halogen-free flame-retardant fabric tape of this example includes a flame-retardant fabric tape and a waterproof coating on the surface; The flame-retardant fabric tape is made from the following raw materials: 9 kg of polypropylene resin, 0.3 kg of inorganic flame retardant, 0.1 kg of antioxidant, 0.1 kg of lubricant, 0.5 kg of phosphorus-based flame retardant, 1 g of nucleating agent and 1 g of antistatic agent. The antioxidant is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 3:1; The lubricant is prepared by mixing stearic acid and polyethylene wax in a mass ratio of 1:1; The antistatic agent is prepared by mixing glyceryl monostearate and polyethylene glycol ester in a mass ratio of 1:1; The phosphorus-based flame retardant is prepared by mixing ammonium polyphosphate and melamine polyphosphate in a mass ratio of 2:1.

[0020] The preparation method of a halogen-free flame-retardant fabric tape according to this embodiment includes the following steps: S1. Mix the raw materials required for flame-retardant fabric tape to obtain a mixture. Add the mixture to an extruder and melt it at 200°C to obtain a spinning solution. Spray out the yarn with a spray orifice diameter of 0.1 mm. Cool and solidify at room temperature. Stretch and oil it. The temperature of the stretching roller is 120°C and the stretch ratio is 1.1. The spinning oil agent is oleate. Cool to room temperature and wind and collect to obtain flame-retardant fibers. Weave the flame-retardant fibers into flame-retardant fabric tape. S2. The flame-retardant fabric tape is immersed in a cleaning solution prepared by mixing 2g of dodecyl alcohol polyoxyethylene ether, 1L of deionized water and 1g of sodium hydroxide, heated to 60℃ and cleaned for 20 minutes. After drying, it is waterproofed to obtain a waterproof coating. The tape is then leveled, rolled up, cut and packaged to obtain halogen-free flame-retardant fabric tape.

[0021] The preparation method of the inorganic composite flame retardant in this embodiment includes the following steps: S11. Add 5.2g of lanthanum nitrate, 11g of aluminum nitrate and 22.2g of magnesium nitrate to 200g of deionized water, add 40g of triethanolamine dropwise, heat to 90℃ and hydrothermally react for 1h, filter to collect the solid, wash with deionized water and dry at 50℃ to obtain modified hydrotalcite. S12. Add 12g of modified hydrotalcite to 45g of 50wt% ethanol aqueous solution, add 3g of A-151, heat to 70℃ and react for 2h, filter to collect solid, wash with deionized water and ethanol in sequence, and dry at 60℃ to obtain modified flame retardant additive. Mix 10g of modified flame retardant additive and 40g of zinc borate with an average particle size of 2.1μm to obtain inorganic composite flame retardant.

[0022] The waterproofing process in S2 includes the following steps: S21. Add 50g of KH-560 to 100g of deionized water for hydrolysis, distill under reduced pressure, add 1000g of polydimethylsiloxane, add 4g of tetramethylammonium hydroxide catalyst under nitrogen atmosphere, heat to 110℃ and react for 1h, add deionized water to adjust the concentration to 15wt%, and distill under reduced pressure to obtain waterproof coating. S22. Add 50g of amino curing agent to 1kg of waterproof coating, impregnate the flame-retardant fabric tape, scrape off excess liquid, allow to dry at room temperature, and then spray with silica sol. The spraying amount of silica sol is 7g / m. 3 A waterproof coating is obtained by heating to 100℃ and curing for 1 hour.

[0023] Example 2: A halogen-free flame-retardant fabric tape of this example includes a flame-retardant fabric tape and a waterproof coating on the surface; The flame-retardant fabric tape is made from the following raw materials: 8.5 kg of polypropylene resin, 0.4 kg of inorganic flame retardant, 0.15 kg of antioxidant, 0.2 kg of lubricant, 0.5 kg of phosphorus-based flame retardant, 1 g of nucleating agent and 2 g of antistatic agent. The antioxidant is prepared by mixing antioxidant 1010 and antioxidant 2246 in a mass ratio of 1:1; The lubricant is prepared by mixing stearic acid and ethylene bis-stearamide in a mass ratio of 1:2; The antistatic agent is prepared by mixing coconut oil alkyl diethanolamine and polyethylene glycol ester in a mass ratio of 2:1; The phosphorus-based flame retardant is prepared by mixing ammonium polyphosphate and melamine polyphosphate in a mass ratio of 1:1.

[0024] The preparation method of a halogen-free flame-retardant fabric tape according to this embodiment includes the following steps: S1. Mix the raw materials required for flame-retardant fabric tape to obtain a mixture. Add the mixture to an extruder and melt it at 180°C to obtain a spinning solution. Spray out the yarn with a spray orifice diameter of 0.3 mm. Cool and solidify at room temperature. Stretch and oil it. The temperature of the stretching roller is 140°C and the stretch ratio is 1.11. The spinning oil agent is oleic acid ester. Cool to room temperature and wind and collect to obtain flame-retardant fibers. Weave the flame-retardant fibers into flame-retardant fabric tape. S2. The flame-retardant fabric tape is immersed in a cleaning solution prepared by mixing 2.5g dodecayl alcohol polyoxyethylene ether, 1L deionized water and 1.5g sodium hydroxide. The solution is heated to 60℃ and cleaned for 25 minutes. After drying, it is waterproofed to obtain a waterproof coating. The tape is then leveled, rolled up, cut and packaged to obtain halogen-free flame-retardant fabric tape.

[0025] The preparation method of the inorganic composite flame retardant in this embodiment includes the following steps: S11. Add 5.5g of lanthanum nitrate, 11.7g of aluminum nitrate and 22.5g of magnesium nitrate to 200g of deionized water, add 50g of triethanolamine dropwise, heat to 90℃ and hydrothermally react for 2h, filter to collect the solid, wash with deionized water, and dry at 50℃ to obtain modified hydrotalcite. S12. Add 18g of modified hydrotalcite to 60g of 50wt% ethanol aqueous solution, add 9g of A-151, heat to 75℃ and react for 1h, filter to collect the solid, wash with deionized water and ethanol in sequence, and dry at 50℃ to obtain the modified flame retardant additive. Mix 15g of the modified flame retardant additive and 45g of zinc borate with an average particle size of 2.5μm to obtain an inorganic composite flame retardant.

[0026] The waterproofing process in S2 includes the following steps: S21. Add 60g of KH-560 to 100g of deionized water for hydrolysis, distill under reduced pressure, add 1000g of polydimethylsiloxane, add 4.5g of tetramethylammonium hydroxide catalyst under nitrogen atmosphere, heat to 115℃ and react for 1h, add deionized water to adjust the concentration to 18wt%, and distill under reduced pressure to obtain waterproof coating. S22. Add 60g of amino curing agent to 1kg of waterproof coating, impregnate the flame-retardant fabric tape, scrape off excess liquid, allow to dry at room temperature, and then spray with silica sol. The spraying amount of silica sol is 7.5g / m. 3 A waterproof coating is obtained by heating to 110℃ and curing for 2 hours.

[0027] Example 3: A halogen-free flame-retardant fabric tape of this example includes a flame-retardant fabric tape and a waterproof coating on the surface; The flame-retardant fabric tape is made from the following raw materials: 9 kg of polypropylene resin, 0.5 kg of inorganic flame retardant, 0.25 kg of antioxidant, 0.25 kg of lubricant, 0.5 kg of phosphorus-based flame retardant, 1.5 g of nucleating agent and 1.5 g of antistatic agent. The antioxidant is prepared by mixing antioxidant 168 and antioxidant 2246 in a mass ratio of 1:1; The lubricant is prepared by mixing ethylene bis-stearamide and polyethylene wax in a mass ratio of 3:1. The antistatic agent is prepared by mixing glyceryl monostearate and polyethylene glycol ester in a mass ratio of 1:2; The phosphorus-based flame retardant is prepared by mixing ammonium polyphosphate and melamine polyphosphate in a mass ratio of 2:1.

[0028] The preparation method of a halogen-free flame-retardant fabric tape according to this embodiment includes the following steps: S1. Mix the raw materials required for flame-retardant fabric tape to obtain a mixture. Add the mixture to an extruder and melt it at 220°C to obtain a spinning solution. Spray out the yarn with a spray orifice diameter of 0.5 mm. Cool and solidify at room temperature. Stretch and oil it. The temperature of the stretching roller is 130°C and the stretch ratio is 1.13. The spinning oil agent is oleic acid ester. Cool to room temperature and wind and collect to obtain flame-retardant fibers. Weave the flame-retardant fibers into flame-retardant fabric tape. S2. The flame-retardant fabric tape is immersed in a cleaning solution prepared by mixing 3g of dodecyl alcohol polyoxyethylene ether, 1L of deionized water and 1.5g of sodium hydroxide. The solution is heated to 65℃ and cleaned for 25 minutes. After drying, it is waterproofed to obtain a waterproof coating. The tape is then leveled, rolled up, cut and packaged to obtain halogen-free flame-retardant fabric tape.

[0029] The preparation method of the inorganic composite flame retardant in this embodiment includes the following steps: S11. Add 5.8g of lanthanum nitrate, 12.1g of aluminum nitrate and 22.9g of magnesium nitrate to 300g of deionized water, add 60g of triethanolamine dropwise, heat to 95℃ and hydrothermally react for 2h, filter to collect the solid, wash with deionized water, and dry at 60℃ to obtain modified hydrotalcite. S12. Add 16g of modified hydrotalcite to 50g of 50wt% ethanol aqueous solution, add 7g of A-151, heat to 75℃ and react for 2h, filter to collect solid, wash with deionized water and ethanol in sequence, and dry at 60℃ to obtain modified flame retardant additive. Mix 20g of modified flame retardant additive and 50g of zinc borate with an average particle size of 3.5μm to obtain inorganic composite flame retardant.

[0030] The waterproofing process in S2 includes the following steps: S21. Add 70g of KH-560 to 200g of deionized water for hydrolysis, distill under reduced pressure, add 1000g of polydimethylsiloxane, add 5g of tetramethylammonium hydroxide catalyst under nitrogen atmosphere, heat to 120℃ and react for 3h, add deionized water to adjust the concentration to 25wt%, and distill under reduced pressure to obtain waterproof coating. S22. Add 70g of amino curing agent to 1kg of waterproof coating, impregnate the flame-retardant fabric tape, scrape off excess liquid, allow to dry at room temperature, and then spray with silica sol. The spraying amount of silica sol is 8g / m. 3 A waterproof coating is obtained by heating to 110℃ and curing for 2 hours.

[0031] Example 4: A halogen-free flame-retardant fabric tape of this example includes a flame-retardant fabric tape and a waterproof coating on the surface; The flame-retardant fabric tape is made from the following raw materials: 8.5 kg of polypropylene resin, 0.6 kg of inorganic flame retardant, 0.15 kg of antioxidant, 0.15 kg of lubricant, 0.7 kg of phosphorus-based flame retardant, 3 g of nucleating agent and 2 g of antistatic agent. The antioxidant is antioxidant 1010; The lubricant is ethylene bis-stearamide; The antistatic agent is glyceryl monostearate; The phosphorus-based flame retardant is prepared by mixing ammonium polyphosphate and melamine polyphosphate in a mass ratio of 1:1.

[0032] A method for preparing a halogen-free flame-retardant fabric tape includes the following steps: S1. Mix the raw materials required for flame-retardant fabric tape to obtain a mixture. Add the mixture to an extruder and melt it at 240°C to obtain a spinning solution. Spray out the yarn with a spray orifice diameter of 0.3 mm. Cool and solidify at room temperature. Stretch and oil it. The temperature of the stretching roller is 130°C and the stretch ratio is 1.15. The spinning oil agent is oleate. Cool to room temperature and wind and collect to obtain flame-retardant fibers. Weave the flame-retardant fibers into flame-retardant fabric tape. S2. The flame-retardant fabric tape is immersed in a cleaning solution prepared by mixing 5g of dodecyl alcohol polyoxyethylene ether, 1L of deionized water and 1g of sodium hydroxide, heated to 65℃ and cleaned for 30 minutes. After drying, it is waterproofed to obtain a waterproof coating. The tape is then leveled, rolled up, cut and packaged to obtain halogen-free flame-retardant fabric tape.

[0033] The preparation method of the inorganic composite flame retardant in this embodiment includes the following steps: S11. Add 6.2g of lanthanum nitrate, 12.6g of aluminum nitrate and 23.1g of magnesium nitrate to 300g of deionized water, add 60g of triethanolamine dropwise, heat to 100℃ and hydrothermally react for 1h, filter to collect the solid, wash with deionized water, and dry at 60℃ to obtain modified hydrotalcite. S12. Add 18g of modified hydrotalcite to 60g of 50wt% ethanol aqueous solution, add 9g of A-151, heat to 75℃ and react for 2h, filter to collect the solid, wash with deionized water and ethanol in sequence, and dry at 60℃ to obtain the modified flame retardant additive. Mix 20g of the modified flame retardant additive and 40g of zinc borate with an average particle size of 3.5μm to obtain the inorganic composite flame retardant.

[0034] The waterproofing process in S2 includes the following steps: S21. Add 80g of KH-560 to 20g of deionized water for hydrolysis, distill under reduced pressure, add 1000g of polydimethylsiloxane, add 4g of tetramethylammonium hydroxide catalyst under nitrogen atmosphere, heat to 120℃ and react for 3h, add deionized water to adjust the concentration to 20wt%, and distill under reduced pressure to obtain waterproof coating. S22. Add 100g of amino curing agent to 1kg of waterproof coating, impregnate the flame-retardant fabric tape, scrape off excess liquid, allow to dry at room temperature, and then spray with silica sol. The spraying amount of silica sol is 8.5g / m². 3 A waterproof coating is obtained by heating to 110℃ and curing for 1 hour.

[0035] Example 5: A halogen-free flame-retardant fabric tape of this example includes a flame-retardant fabric tape and a waterproof coating on the surface; The flame-retardant fabric tape is made from the following raw materials: 8.5 kg of polypropylene resin, 0.6 kg of inorganic flame retardant, 0.25 kg of antioxidant, 0.25 kg of lubricant, 1 kg of phosphorus-based flame retardant, 3 g of nucleating agent and 2 g of antistatic agent. The antioxidant is antioxidant 2246; The lubricant is polyethylene wax; The antistatic agent is polyethylene glycol ester; The phosphorus-based flame retardant is prepared by mixing ammonium polyphosphate and melamine polyphosphate in a mass ratio of 1:1.

[0036] A method for preparing a halogen-free flame-retardant fabric tape includes the following steps: S1. Mix the raw materials required for flame-retardant fabric tape to obtain a mixture. Add the mixture to an extruder and melt it at 260°C to obtain a spinning solution. Spray out the yarn with a spray orifice diameter of 0.4 mm. Cool and solidify at room temperature. Stretch and oil it. The temperature of the stretching roller is 140°C and the stretch ratio is 1.15. The spinning oil agent is oleic acid ester. Cool to room temperature and wind and collect to obtain flame-retardant fibers. Weave the flame-retardant fibers into flame-retardant fabric tape. S2. The flame-retardant fabric tape is immersed in a cleaning solution prepared by mixing 2g dodecayl alcohol polyoxyethylene ether, 1L deionized water and 2g sodium hydroxide, heated to 60℃ and cleaned for 30 minutes. After drying, it is waterproofed to obtain a waterproof coating. The tape is then leveled, rolled up, cut and packaged to obtain halogen-free flame-retardant fabric tape.

[0037] The preparation method of the inorganic composite flame retardant in this embodiment includes the following steps: S11. Add 6.5g of lanthanum nitrate, 12.8g of aluminum nitrate and 23.5g of magnesium nitrate to 200g of deionized water, add 60g of triethanolamine dropwise, heat to 90℃ and hydrothermally react for 2h, filter to collect the solid, wash with deionized water, and dry at 60℃ to obtain modified hydrotalcite. S12. Add 18g of modified hydrotalcite to 60g of 50wt% ethanol aqueous solution, add 9g of A-151, heat to 75℃ and react for 2h, filter to collect solid, wash with deionized water and ethanol in sequence, and dry at 60℃ to obtain modified flame retardant additive. Mix 10g of modified flame retardant additive and 60g of zinc borate with an average particle size of 4μm to obtain inorganic composite flame retardant.

[0038] The waterproofing process in S2 includes the following steps: S21. Add 90g of KH-560 to 20g of deionized water for hydrolysis, distill under reduced pressure, add 1000g of polydimethylsiloxane, add 5g of tetramethylammonium hydroxide catalyst under nitrogen atmosphere, heat to 120℃ and react for 3h, add deionized water to adjust the concentration to 25wt%, and distill under reduced pressure to obtain waterproof coating. S22. Add 50g of amino curing agent to 1kg of waterproof coating, impregnate the flame-retardant fabric tape, scrape off excess liquid, allow to dry at room temperature, and then spray with silica sol. The spraying amount of silica sol is 9g / m². 3 A waterproof coating is obtained by heating to 100℃ and curing for 2 hours.

[0039] Comparative Example 1 differs from Example 1 in that the modified flame retardant additive is replaced with magnesium hydroxide powder with an average particle size of 30 μm.

[0040] Comparative Example 2 differs from Example 1 in that the phosphorus-based flame retardant is replaced with brominated polystyrene.

[0041] Comparative Example 3 differs from Example 1 in that silica sol spraying is not performed in waterproofing step S22.

[0042] Performance testing According to GB / T 3923.1-2013 "Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break (Strip Method)", the longitudinal and transverse tensile strength and elongation of the flame-retardant fabric tapes prepared in each example and comparative example were tested. The limiting oxygen index of the flame-retardant fabric tapes prepared in each example and comparative example was tested according to GB / T 5454-1997 "Test for Burning Performance of Textiles - Oxygen Index Method".

[0043] The hydrostatic pressure resistance values ​​of the flame-retardant fabric tapes prepared in each example and comparative example were tested according to GB / T 4744-2013 "Test and evaluation of waterproof performance of textiles - hydrostatic pressure method".

[0044] The test results are shown in Table 1 below: Table 1 Test Results As shown in the table above, the longitudinal tensile strength of the flame-retardant tapes prepared in Examples 1-5 is 57-59 N / 1.5 cm, the transverse tensile strength is 20-23 N / 1.5 cm, the longitudinal elongation is 13-16%, and the transverse elongation is 10-12%, indicating that the flame-retardant tapes prepared by the present invention have excellent mechanical properties, good elasticity, and tensile strength. The limiting oxygen index of the flame-retardant tapes prepared in Examples 1-5 is 37.2-39.4%, indicating that the flame-retardant tapes prepared by the present invention still have excellent flame-retardant properties even without halogenated flame retardants. The hydrostatic pressure resistance of the flame-retardant tapes prepared in Examples 1-5 is 60.4-61.7 kPa, indicating that the flame-retardant tapes prepared by the present invention have excellent waterproof properties.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A halogen-free flame-retardant fabric tape, characterized in that, Includes flame-retardant fabric tape and a waterproof coating on the surface; The flame-retardant fabric tape is made from the following raw materials in parts by weight: 85-95 parts polypropylene resin, 3-6 parts inorganic flame retardant, 1-2.5 parts antioxidant, 1-2.5 parts lubricant, 5-10 parts phosphorus-based flame retardant, 0.001-0.003 parts nucleating agent and 0.001-0.002 parts antistatic agent.

2. The halogen-free flame-retardant fabric tape according to claim 1, characterized in that, The antioxidant is one or more of antioxidant 1010, antioxidant 168, and antioxidant 2246; the lubricant is one or more of stearic acid, ethylene bis-stearamide, and polyethylene wax; the nucleating agent is a sorbitol-based nucleating agent; the antistatic agent is one or more of glyceryl monostearate, cocoyl diethanolamine, and polyethylene glycol ester; and the phosphorus-based flame retardant is prepared by mixing ammonium polyphosphate and melamine polyphosphate in a mass ratio of 1 to 2:

1.

3. The halogen-free flame-retardant fabric tape according to claim 1, characterized in that, The preparation method of the inorganic composite flame retardant includes the following steps: S11. Lanthanum nitrate, aluminum nitrate and magnesium nitrate were added to deionized water, triethanolamine was added dropwise, the mixture was heated to a hydrothermal reaction, the solid was collected by filtration, washed and dried to obtain modified hydrotalcite. S12. Modified hydrotalcite was added to a 50wt% ethanol aqueous solution, A-151 was added, the mixture was heated to react, the solid was collected by filtration, washed, and dried to obtain a modified flame retardant additive. The modified flame retardant additive was then mixed with zinc borate to obtain an inorganic composite flame retardant.

4. The halogen-free flame-retardant fabric tape according to claim 3, characterized in that, In S11, the mass ratio of deionized water, lanthanum nitrate, aluminum nitrate, and magnesium nitrate is 100~150:2.6~3.3:5.5~6.5:11.1~11.

8. The amount of triethanolamine added is 20~30% of the mass of deionized water. The mixture is heated to 90~100℃ and reacted for 1~2 hours. After washing with deionized water, it is dried at 50~60℃.

5. The halogen-free flame-retardant fabric tape according to claim 4, characterized in that, The mass ratio of modified hydrotalcite, A-151 and 50wt% ethanol aqueous solution in S12 is 4~6:1~3:15~20. The reaction is carried out at 70~75℃ for 1~2 hours, washed sequentially with deionized water and ethanol, and dried at 50~60℃. The mass ratio of modified flame retardant additive and zinc borate is 1~2:4~6, and the average particle size of zinc borate is 2~4μm.

6. A method for preparing a halogen-free flame-retardant fabric tape according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Mix the raw materials required for flame-retardant fabric tape to obtain a mixture, add the mixture to an extruder to melt and obtain a spinning solution, spray out the yarn, cool and solidify at room temperature, pull and oil it, cool to room temperature, wind and collect it to obtain flame-retardant fibers, and weave the flame-retardant fibers into flame-retardant fabric tape. S2. The flame-retardant fabric tape is immersed in a cleaning solution for cleaning, dried, and then waterproofed to obtain a waterproof coating. It is then leveled, rolled up, cut, and packaged to obtain halogen-free flame-retardant fabric tape.

7. The method for preparing a halogen-free flame-retardant fabric tape according to claim 6, characterized in that, In step S1, the material is melted at 180~260℃, the spray orifice diameter is 0.1~0.5mm, the temperature of the stretching roller is 120~140℃, the stretching ratio is 1.1~1.15, and the spinning oil is oleate. In step S2, the cleaning solution is prepared by mixing 2~5g of dodecyl polyoxyethylene ether, 1L of deionized water and 1~2g of sodium hydroxide, heated to 60~70℃ for 20~30min, and dried at 50~60℃.

8. The method for preparing a halogen-free flame-retardant fabric tape according to claim 6, characterized in that, The waterproofing process in S2 includes the following steps: S21. KH-560 is added to deionized water for hydrolysis, followed by vacuum distillation and the addition of polydimethylsiloxane. Tetramethylammonium hydroxide catalyst is added under a nitrogen atmosphere, the reaction is heated, deionized water is added to adjust the concentration, and the waterproof coating is obtained by vacuum distillation. S22. Add the amino curing agent to the waterproof coating, impregnate the flame-retardant cloth tape, scrape off the excess liquid, dry at room temperature, then spray on the silica sol, and heat to cure to obtain the waterproof coating.

9. The method for preparing a halogen-free flame-retardant fabric tape according to claim 7, characterized in that, In S21, the mass ratio of KH-560, polydimethylsiloxane, and tetramethylammonium hydroxide catalyst is 5-10:100:0.4-0.5, and the reaction is carried out at 110-120℃ for 1-3 hours. Deionized water is added to adjust the concentration to 15-25 wt%. In S22, the amount of amino curing agent added is 5-10 wt% of the mass of the waterproof coating, and the spraying amount of silica sol is 7-10 g / m². 3 Heat to 100~110℃ and cure for 1~2 hours.

10. The application of a halogen-free flame-retardant fabric tape according to any one of claims 1-5, characterized in that, Used to manufacture halogen-free flame-retardant cables.

Images