High-strength fire hose material and preparation method thereof

Abstract

The invention discloses a high-strength fire hose material and a preparation method, and belongs to the technical field of fire hose material preparation. The preparation method of the high-strength fire hose material comprises the following steps: 1, drying thermoplastic polyurethane particles and modified polyamide particles, mixing with a compatibilizer, adding into an extruder, and carrying out melt blending, extrusion, cooling and shaping to obtain a lining layer pipe; 2, the surface of the lining layer pipe is heated, then the aramid fibers coated with the epoxy-based impregnating compound are woven to the outer surface of the lining layer pipe, and a lining layer-reinforcing layer pre-composite pipe is obtained; 3, thermoplastic polyurethane particles and a composite weather-resistant agent are mixed and then added into an extruding machine, then the surface of the lining layer-reinforcing layer pre-composite pipe is wrapped with the mixture, heat treatment, sizing and cooling are conducted, and the high-strength fire hose material is obtained. The fire hose material prepared by the method has excellent mechanical properties and weather resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of fire hose material preparation, and particularly relates to a high-strength fire hose material and a preparation method thereof. Background Art

[0002] When dealing with complex fire scenarios, the weather resistance and insufficient strength of traditional fire hoses are becoming increasingly prominent, becoming a key bottleneck restricting the improvement of firefighting efficiency. Under extreme environmental conditions, ordinary hose materials are easily affected by natural factors such as ultraviolet rays, temperature fluctuations, and chemical corrosion, resulting in accelerated material aging and degradation of physical properties. For example, ordinary rubber or PVC-lined hoses may lose their flexibility due to hardening, catalysis, or softening of the material when exposed to high or low temperature environments for a long time, directly affecting the hose deployment speed and operational reliability; in highly corrosive environments such as chemical fires, the hose lining is easily corroded by chemicals, resulting in the risk of leakage or even rupture, endangering the lives of firefighters. In addition, traditional hoses have obvious shortcomings in tensile strength and wear resistance. When supplying water to high-rise buildings, transporting water over long distances, or laying on complex terrain, they are prone to structural damage due to water pressure shock, ground friction, or scratches from sharp objects, shortening their service life and increasing maintenance costs.

[0003] Patent CN109593286A discloses an anti-aging fire hose material comprising the following components by weight: 15-45 parts polyvinyl chloride, 20-30 parts methyl MQ silicone resin, 5-10 parts hexabromododecane, 4-8 parts polydimethylsiloxane, 2-9 parts butylparaben, 1-10 parts amino oligosaccharide, 2-9 parts antimony trioxide, 3-8 parts tetramethylthiuram disulfide, 4-13 parts benzalkonium chloride, and 1-4 parts adhesive. The fire hose material produced by this invention exhibits excellent anti-aging properties, but the weather resistance and mechanical properties of the fire hose material produced by this method still need to be improved. Summary of the Invention

[0004] The object of the present invention is to provide a high-strength fire hose material and a preparation method thereof, so as to solve the technical problems of poor weather resistance and mechanical properties of fire hose materials in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for preparing a high-strength fire hose material, comprising the following steps:

[0007] Step 1: After drying the thermoplastic polyurethane particles and the modified polyamide particles, they are mixed with a compatibilizer, and then added to an extruder for melt blending, extrusion, cooling, and shaping to obtain an inner lining pipe;

[0008] Step 2: Heating the surface of the inner lining pipe, and then weaving the aramid fiber coated with an epoxy-based sizing agent onto the outer surface of the inner lining pipe to obtain an inner lining layer-reinforcement layer pre-composite pipe;

[0009] Step 3: After mixing the thermoplastic polyurethane particles with the composite weathering agent, add them into the extruder, and then wrap them on the surface of the lining layer-reinforcement layer pre-composite pipe, heat treat, shape, and cool to obtain a high-strength fire hose material.

[0010] Preferably, in the step one, the amount ratio of the thermoplastic polyurethane particles, the modified polyamide particles and the compatibilizer is (70-80) g: (20-25) g: (3-8) g, the feeding zone temperature of the extruder is 160-170°C, the compression zone temperature is 192-198°C, the metering zone temperature is 208-212°C, and the die head temperature is 202-207°C; in the step two, the epoxy wetting agent is obtained by mixing 40-60 g of epoxy resin emulsion, 2-4 g of silane coupling agent KH-550 and 50-64 g of distilled water, and a mixed solution of 3-5 g of thermoplastic polyurethane and 0.45-0.75 mL of butanone is sprayed during the weaving process; in the step three, the amount ratio of the thermoplastic polyurethane particles and the composite weathering agent is (30-40) g: (2-5) g.

[0011] Preferably, the method for preparing the modified polyamide particles comprises the following steps:

[0012] Q1: Add diphenylglycolic acid and phthalic anhydride to a container, introduce nitrogen, then add N,N-dimethylformamide, triethylborane, 1,8-diazabicyclo[5.4.0]undec-7-ene and cyclohexene oxide in sequence, heat in an oil bath and magnetically stir to react. After the reaction is completed, cool, add acetic acid to quench the reaction, precipitate, wash, and freeze-dry to obtain compound 1;

[0013] In the above process, the synthetic reaction formula of compound 1 is as follows:

[0014]

[0015] Q2: Add 2-methyl-3-nitrobenzoic acid to a container containing thionyl chloride and N,N-dimethylformamide, stir and heat to react, purify to obtain a dark red liquid; add N-methyl-4-nitrobenzene-1,2-diamine, triethylamine and tetrahydrofuran to the container, add the dark red liquid dropwise under stirring in an ice bath, after the addition is complete, react at room temperature, purify to obtain a yellow monomer; add the yellow monomer, p-toluenesulfonic acid monohydrate and acetic acid to the container, heat and reflux to react, purify to obtain white crystals; add the white crystals, Pd / C and ethanol to the container, heat and react, then add hydrazine hydrate dropwise, stir and react, purify to obtain compound 2;

[0016] In the above process, the synthetic reaction formula of compound 2 is as follows:

[0017]

[0018] The results of mass spectrometry analysis of the deep red liquid were: m / z: 199.00 (100.0%), 201.00 (32.0%), 200.01 (8.8%), 202.00 (2.9%), 201.01 (1.0%); the results of mass spectrometry analysis of the white crystals were: m / z: 312.09 (100.0%), 313.09 (16.5%), 314.09 (2.3%), 313.08 (1.5%); the results of mass spectrometry analysis of compound 2 were: m / z: 252.14 (100.0%), 253.14 (16.4%), 253.13 (1.5%), 254.14 (1.5%).

[0019] Q3: Compound 2 is added to N,N-dimethylacetamide, and after stirring and mixing, compound 1 is added, and the mixture is dried, heated, and crushed to obtain modified polyamide particles.

[0020] Preferably, in Q1, the amount ratio of diphenylglycolic acid, phthalic anhydride, N,N-dimethylformamide, triethyl boron, 1,8-diazabicyclo[5.4.0]undec-7-ene and cyclohexene oxide is (0.31-0.47) g: (2.12-3) g: (8-12) mL: (0.15-0.196) g: (0.023-0.029) mL: (1.71-1.79) mL, the oil bath heating temperature is 98-102°C, and the stirring reaction time is 10-12 h.

[0021] Preferably, in Q2, the amount ratio of 2-methyl-3-nitrobenzoic acid, thionyl chloride and N,N-dimethylformamide is (6-8) g: (48-52) mL: (0.8-1.1) mL, and the temperature of the reaction is 78-83 ° C; the amount ratio of N-methyl-4-nitrobenzene-1,2-diamine, triethylamine, tetrahydrofuran and dark red liquid is (4.82-5.04) g: (3.81-4.03) g: (48-52) mL: (6.92-7.36) g, The reaction time at room temperature is 20-24 hours; the usage ratio of the yellow monomer, p-toluenesulfonic acid monohydrate and acetic acid is (8.12-8.56) g: (7.11-7.29) g: (80-86.8) mL, the reflux reaction temperature is 110-130° C., and the reaction time is 6-8 hours; the usage ratio of the white crystal, Pd / C, ethanol and hydrazine hydrate is (4-6) g: (0.3-0.7) g: (45-55) mL: (7.2-8.8) g, and the heating reaction temperature is 80-82° C.

[0022] Preferably, in Q3, the usage ratio of compound 2, N,N-dimethylacetamide and compound 1 is (1.01-1.23) g: (5.12-6.04) g: (0.93-0.98) g.

[0023] Preferably, the preparation method of the composite weathering agent comprises the following steps:

[0024] S1: Potassium hydroxide is added to a container containing ethanol and distilled water, followed by benzaldehyde and acetone. After stirring at room temperature, the mixture is filtered, washed, and recrystallized to obtain intermediate A.

[0025] S2: Add benzotriazole, intermediate A, cesium carbonate and dichloromethane to a container in sequence, stir and react at room temperature. After the reaction is completed, extract, dry, concentrate by rotary evaporation, and purify to obtain a composite weathering agent.

[0026] In the above process, the synthetic reaction formula of the composite weathering agent is as follows:

[0027]

[0028] The results of mass spectrometry analysis of intermediate A were: m / z: 234.10 (100.0%), 235.11 (18.6%), 236.11 (1.8%); the results of mass spectrometry analysis of the composite weathering agent were: m / z: 353.15 (100.0%), 354.16 (25.1%), 355.16 (3.2%), 354.15 (1.1%).

[0029] Preferably, in S1, the dosage ratio of potassium hydroxide, ethanol, distilled water, benzaldehyde and acetone is (0.5-0.9) g: (7-8.2) mL: (8-10) mL: (1.01-1.11) g: (0.21-0.37) g, and the stirring time at room temperature is 30-45 min.

[0030] Preferably, in S2, the usage ratio of benzotriazole, intermediate A, cesium carbonate and dichloromethane is (0.32-0.51) g: (0.48-0.54) g: (0.14-0.18) g: (20-30) mL, and the stirring time is 3-5 h.

[0031] The high-strength fire hose material is prepared by adopting the preparation method of the high-strength fire hose material.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0033] 1. The present invention first mixes modified polyamide particles with thermoplastic polyurethane particles to prepare an inner lining pipe of a fire hose material, and then adds a composite weathering agent to the thermoplastic polyurethane particles to form the outer layer material of the fire hose material, so that the obtained fire hose material has excellent mechanical properties and weather resistance.

[0034] 2. The present invention mixes the prepared modified polyamide particles with thermoplastic polyurethane particles to prepare an inner lining pipe of a fire hose material, which can effectively improve its mechanical properties. The rigid structure of benzimidazole contained in the modified polyamide particles can form intramolecular hydrogen bonds and π-π stacking, construct physical cross-linking points, and inhibit molecular chain slip. The covalent network structure formed by the modified polyamide and thermoplastic polyurethane enhances the interfacial bonding force and improves the mechanical properties of the material.

[0035] 3. The present invention adds the prepared composite weathering agent to thermoplastic polyurethane particles as the outer layer material of the fire hose material, which can effectively improve its weather resistance. The benzotriazole group contained in the composite weathering agent can significantly slow down the aging of the polyurethane material under sunlight and extend the service life of the hose material. DETAILED DESCRIPTION

[0036] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Example 1: This example discloses a method for preparing modified polyamide particles, comprising the following steps:

[0038] Q1: 0.39 g of diphenylglycolic acid and 2.56 g of phthalic anhydride were added to a container, nitrogen was introduced, and then 10 mL of N,N-dimethylformamide, 0.173 g of triethylboron, 0.025 mL of 1,8-diazabicyclo[5.4.0]undec-7-ene and 1.75 mL of cyclohexene oxide were added in sequence. The mixture was heated in an oil bath at 100°C with magnetic stirring for 12 h. After the reaction was completed, the mixture was cooled, acetic acid was added to quench the reaction, the mixture was precipitated, washed, and freeze-dried to obtain compound 1;

[0039] Q2: 7 g of 2-methyl-3-nitrobenzoic acid was added to a container containing 50 mL of thionyl chloride and 0.95 mL of N,N-dimethylformamide, stirred and heated to 80°C for reaction, purified to obtain a dark red liquid; 4.93 g of N-methyl-4-nitrobenzene-1,2-diamine, 3.92 g of triethylamine and 50 mL of tetrahydrofuran were added to the container, and 7.12 g of the dark red liquid was added dropwise under stirring in an ice bath. After the addition was complete, the mixture was reacted at room temperature for 24 hours and purified to obtain a yellow monomer; 8.34 g of the yellow monomer, 7.2 g of p-toluenesulfonic acid monohydrate and 83.4 mL of acetic acid were added to the container, heated to 120°C and refluxed for reaction for 8 hours, purified to obtain white crystals; 5 g of white crystals, 0.5 g of Pd / C and 50 mL of ethanol were added to the container, heated to 80°C for reaction, and 8 g of hydrazine hydrate was added dropwise, stirred for reaction, and purified to obtain compound 2;

[0040] Q3: 1.12 g of compound 2 was added to 5.63 g of N,N-dimethylacetamide, and after stirring and mixing, 0.95 g of compound 1 was added. The mixture was dried, heated, and crushed to obtain modified polyamide particles.

[0041] This embodiment discloses a method for preparing a composite weathering agent, comprising the following steps:

[0042] S1: Add 0.7 g of potassium hydroxide to a container containing 7.6 mL of ethanol and 9 mL of distilled water, then add 1.06 g of benzaldehyde and 0.29 g of acetone in sequence. Stir at room temperature for 30 min, filter, wash, and recrystallize to obtain intermediate A.

[0043] S2: 0.42 g of benzotriazole, 0.51 g of intermediate A, 0.16 g of cesium carbonate and 25 mL of dichloromethane were added to a container in sequence, and stirred at room temperature for 4 h. After the reaction, the mixture was extracted, dried, concentrated by rotary evaporation, and purified to obtain a composite weathering agent.

[0044] This embodiment discloses a method for preparing a high-strength fire hose material, comprising the following steps:

[0045] Step 1: After drying 75g of thermoplastic polyurethane particles and 22.5g of modified polyamide particles, mix them with 5.5g of compatibilizer, and then add them to an extruder. The temperature of the feeding zone of the extruder is 165°C, the temperature of the compression zone is 195°C, the temperature of the metering zone is 210°C, and the temperature of the die head is 205°C. Melt blending, extrusion, cooling, and shaping are performed to obtain an inner lining pipe;

[0046] Step 2: The surface of the inner lining pipe is heated, and then an aramid fiber coated with an epoxy-based sizing agent (prepared by mixing 50g of epoxy resin emulsion, 3g of silane coupling agent KH-550, and 57g of distilled water) is braided onto the outer surface of the inner lining pipe. During the braiding process, a mixed solution of 4g of thermoplastic polyurethane and 0.6mL of butanone is sprayed to obtain an inner lining layer-reinforcement layer pre-composite pipe;

[0047] Step 3: Mix 35g of thermoplastic polyurethane particles with 3.5g of composite weathering agent, add them to the extruder, and then wrap them on the surface of the lining layer-reinforcement layer pre-composite pipe, heat treat, shape, and cool to obtain a high-strength fire hose material.

[0048] Example 2: This example discloses a method for preparing modified polyamide particles, comprising the following steps:

[0049] Q1: 0.31 g of diphenylglycolic acid and 2.12 g of phthalic anhydride were added to a container, nitrogen was introduced, and then 8 mL of N,N-dimethylformamide, 0.15 g of triethylborane, 0.023 mL of 1,8-diazabicyclo[5.4.0]undec-7-ene and 1.71 mL of cyclohexene oxide were added in sequence. The mixture was heated in an oil bath at 100°C with magnetic stirring for 12 h. After the reaction was completed, the mixture was cooled, acetic acid was added to quench the reaction, the mixture was precipitated, washed, and freeze-dried to obtain compound 1;

[0050] Q2: 8 g of 2-methyl-3-nitrobenzoic acid was added to a container containing 52 mL of thionyl chloride and 0.8 mL of N,N-dimethylformamide, stirred and heated to 80°C for reaction, purified to obtain a dark red liquid; 4.82 g of N-methyl-4-nitrobenzene-1,2-diamine, 3.81 g of triethylamine and 52 mL of tetrahydrofuran were added to the container, and 6.92 g of the dark red liquid was added dropwise under stirring in an ice bath. After the addition was complete, the mixture was reacted at room temperature for 24 hours and purified to obtain a yellow monomer; 8.12 g of the yellow monomer, 7.11 g of p-toluenesulfonic acid monohydrate and 80 mL of acetic acid were added to the container, heated to 120°C and refluxed for reaction for 8 hours, purified to obtain white crystals; 4 g of white crystals, 0.7 g of Pd / C and 45 mL of ethanol were added to the container, heated to 80°C for reaction, and 7.2 g of hydrazine hydrate was added dropwise, stirred for reaction, and purified to obtain compound 2;

[0051] Q3: 1.01 g of compound 2 was added to 5.12 g of N,N-dimethylacetamide, and the mixture was stirred and mixed, and then 0.93 g of compound 1 was added. The mixture was dried, heated, and crushed to obtain modified polyamide particles.

[0052] This embodiment discloses a method for preparing a composite weathering agent, comprising the following steps:

[0053] S1: Add 0.5 g of potassium hydroxide to a container containing 7 mL of ethanol and 10 mL of distilled water, then add 1.01 g of benzaldehyde and 0.21 g of acetone in sequence. Stir at room temperature for 30 min, filter, wash, and recrystallize to obtain intermediate A.

[0054] S2: 0.32 g of benzotriazole, 0.48 g of intermediate A, 0.14 g of cesium carbonate and 20 mL of dichloromethane were added to a container in sequence, and stirred at room temperature for 4 h. After the reaction, the mixture was extracted, dried, concentrated by rotary evaporation, and purified to obtain a composite weathering agent.

[0055] This embodiment discloses a method for preparing a high-strength fire hose material, comprising the following steps:

[0056] Step 1: 70g of thermoplastic polyurethane particles and 25g of modified polyamide particles are dried, mixed with 3g of a compatibilizer, and then added to an extruder. The temperature of the feeding zone of the extruder is 165°C, the temperature of the compression zone is 195°C, the temperature of the metering zone is 210°C, and the temperature of the die head is 205°C. Melt blending, extrusion, cooling, and shaping are performed to obtain an inner lining pipe;

[0057] Step 2: The surface of the inner lining pipe is heated, and then an aramid fiber coated with an epoxy-based sizing agent (prepared by mixing 40g of epoxy resin emulsion, 4g of silane coupling agent KH-550, and 64g of distilled water) is braided onto the outer surface of the inner lining pipe. During the braiding process, a mixed solution of 3g of thermoplastic polyurethane and 0.45mL of butanone is sprayed to obtain an inner lining layer-reinforcement layer pre-composite pipe;

[0058] Step 3: Mix 30g of thermoplastic polyurethane particles with 2g of composite weathering agent, add them to the extruder, and then wrap them on the surface of the lining layer-reinforcement layer pre-composite pipe, heat treat, shape, and cool to obtain a high-strength fire hose material.

[0059] Example 3: This example discloses a method for preparing modified polyamide particles, comprising the following steps:

[0060] Q1: 0.47 g of diphenylglycolic acid and 3 g of phthalic anhydride were added to a container, nitrogen was introduced, and then 12 mL of N,N-dimethylformamide, 0.196 g of triethylborane, 0.029 mL of 1,8-diazabicyclo[5.4.0]undec-7-ene and 1.79 mL of cyclohexene oxide were added in sequence. The mixture was heated in an oil bath at 100°C with magnetic stirring for 12 h. After the reaction was completed, the mixture was cooled, acetic acid was added to quench the reaction, the mixture was precipitated, washed, and freeze-dried to obtain compound 1;

[0061] Q2: 6 g of 2-methyl-3-nitrobenzoic acid was added to a container containing 48 mL of thionyl chloride and 1.1 mL of N,N-dimethylformamide, stirred and heated to 80°C for reaction, purified to obtain a dark red liquid; 5.04 g of N-methyl-4-nitrobenzene-1,2-diamine, 4.03 g of triethylamine and 48 mL of tetrahydrofuran were added to the container, and 7.36 g of the dark red liquid was added dropwise under stirring in an ice bath. After the addition was complete, the reaction was carried out at room temperature for 24 hours, purified to obtain a yellow monomer; 8.56 g of the yellow monomer, 7.29 g of p-toluenesulfonic acid monohydrate and 86.4 mL of acetic acid were added to the container, heated to 120°C and refluxed for reaction for 8 hours, purified to obtain white crystals; 6 g of white crystals, 0.3 g of Pd / C and 55 mL of ethanol were added to the container, heated to 80°C for reaction, and 8.8 g of hydrazine hydrate was added dropwise, stirred for reaction, and purified to obtain compound 2;

[0062] Q3: 1.23 g of compound 2 was added to 6.04 g of N,N-dimethylacetamide, and after stirring and mixing, 0.98 g of compound 1 was added. The mixture was dried, heated, and crushed to obtain modified polyamide particles.

[0063] This embodiment discloses a method for preparing a composite weathering agent, comprising the following steps:

[0064] S1: Add 0.9 g of potassium hydroxide to a container containing 8.2 mL of ethanol and 8 mL of distilled water, then add 1.11 g of benzaldehyde and 0.37 g of acetone in sequence. Stir at room temperature for 30 min, filter, wash, and recrystallize to obtain intermediate A.

[0065] S2: 0.51 g of benzotriazole, 0.54 g of intermediate A, 0.18 g of cesium carbonate and 30 mL of dichloromethane were added to a container in sequence, and stirred at room temperature for 4 h. After the reaction, the mixture was extracted, dried, concentrated by rotary evaporation, and purified to obtain a composite weathering agent.

[0066] This embodiment discloses a method for preparing a high-strength fire hose material, comprising the following steps:

[0067] Step 1: 80g of thermoplastic polyurethane particles and 20g of modified polyamide particles are dried, mixed with 8g of a compatibilizer, and then added to an extruder. The temperature of the feeding zone of the extruder is 165°C, the temperature of the compression zone is 195°C, the temperature of the metering zone is 210°C, and the temperature of the die head is 205°C. Melt blending, extrusion, cooling, and shaping are performed to obtain an inner lining pipe;

[0068] Step 2: The surface of the inner lining pipe is heated, and then an aramid fiber coated with an epoxy-based wetting agent (prepared by mixing 60g of epoxy resin emulsion, 2g of silane coupling agent KH-550, and 50g of distilled water) is braided onto the outer surface of the inner lining pipe. During the braiding process, a mixed solution of 5g of thermoplastic polyurethane and 0.75mL of butanone is sprayed to obtain an inner lining layer-reinforcement layer pre-composite pipe;

[0069] Step 3: Mix 40g of thermoplastic polyurethane particles with 5g of composite weathering agent, add them to the extruder, and then wrap them on the surface of the lining layer-reinforcement layer pre-composite pipe, heat treat, shape, and cool to obtain a high-strength fire hose material.

[0070] Example 4: This example discloses a method for preparing modified polyamide particles, comprising the following steps:

[0071] Q1: 0.35 g of diphenylglycolic acid and 2.34 g of phthalic anhydride were added to a container, nitrogen was introduced, and then 11 mL of N,N-dimethylformamide, 0.163 g of triethylboron, 0.024 mL of 1,8-diazabicyclo[5.4.0]undec-7-ene and 1.77 mL of cyclohexene oxide were added in sequence. The mixture was heated in an oil bath at 100°C with magnetic stirring for 12 h. After the reaction was completed, the mixture was cooled, acetic acid was added to quench the reaction, the mixture was precipitated, washed, and freeze-dried to obtain compound 1;

[0072] Q2: 6.5 g of 2-methyl-3-nitrobenzoic acid was added to a container containing 49 mL of thionyl chloride and 0.9 mL of N,N-dimethylformamide, stirred and heated to 80°C for reaction, purified to obtain a dark red liquid; 4.87 g of N-methyl-4-nitrobenzene-1,2-diamine, 3.89 g of triethylamine and 51 mL of tetrahydrofuran were added to the container, 7.02 g of the dark red liquid was added dropwise under stirring in an ice bath, after the addition was complete, the reaction was carried out at room temperature for 24 hours, purified to obtain a yellow monomer; 8.23 g of the yellow monomer, 7.15 g of p-toluenesulfonic acid monohydrate and 81 mL of acetic acid were added to the container, heated to 120°C and refluxed for reaction for 8 hours, purified to obtain white crystals; 4.5 g of white crystals, 0.4 g of Pd / C and 48 mL of ethanol were added to the container, heated to 80°C for reaction, 7.6 g of hydrazine hydrate was added dropwise, stirred for reaction, and purified to obtain compound 2;

[0073] Q3: 1.08 g of compound 2 was added to 5.31 g of N,N-dimethylacetamide, and after stirring and mixing, 0.94 g of compound 1 was added. The mixture was dried, heated, and crushed to obtain modified polyamide particles.

[0074] This embodiment discloses a method for preparing a composite weathering agent, comprising the following steps:

[0075] S1: Add 0.6 g of potassium hydroxide to a container containing 7.3 mL of ethanol and 9.5 mL of distilled water, then add 1.03 g of benzaldehyde and 0.25 g of acetone in sequence. Stir at room temperature for 30 min, filter, wash, and recrystallize to obtain intermediate A.

[0076] S2: 0.38 g of benzotriazole, 0.49 g of intermediate A, 0.15 g of cesium carbonate and 22 mL of dichloromethane were added to a container in sequence, and stirred at room temperature for 4 h. After the reaction, the mixture was extracted, dried, concentrated by rotary evaporation, and purified to obtain a composite weathering agent.

[0077] This embodiment discloses a method for preparing a high-strength fire hose material, comprising the following steps:

[0078] Step 1: After drying 72g of thermoplastic polyurethane particles and 21g of modified polyamide particles, mix them with 4g of compatibilizer, and then add them to the extruder. The temperature of the feeding zone of the extruder is 165°C, the temperature of the compression zone is 195°C, the temperature of the metering zone is 210°C, and the temperature of the die head is 205°C. Melt blending, extrusion, cooling, and shaping are performed to obtain an inner lining pipe;

[0079] Step 2: The surface of the inner lining pipe is heated, and then an aramid fiber coated with an epoxy-based wetting agent (prepared by mixing 45g of epoxy resin emulsion, 2.5g of silane coupling agent KH-550, and 52g of distilled water) is woven onto the outer surface of the inner lining pipe. During the weaving process, a mixed solution of 3.5g of thermoplastic polyurethane and 0.5mL of butanone is sprayed to obtain an inner lining-reinforcement layer pre-composite pipe;

[0080] Step 3: Mix 32g of thermoplastic polyurethane particles with 4g of composite weathering agent, add them to the extruder, and then wrap them on the surface of the lining layer-reinforcement layer pre-composite pipe, heat treat, shape, and cool to obtain a high-strength fire hose material.

[0081] Comparative Example 1: Compared with Example 1, in Comparative Example 1, during the preparation of the high-strength fire hose material, no modified polyamide particles were added, and other conditions remained unchanged.

[0082] Comparative Example 2: Compared with Example 1, in Comparative Example 2, during the preparation of the high-strength fire hose material, no composite weathering agent was added, and other conditions remained unchanged.

[0083] The high-strength fire hose materials prepared in Examples 1-4 and Comparative Examples 1-2 were subjected to performance tests. The mechanical properties of the samples were tested in accordance with GB6246-2011. The samples were placed in a UV lamp irradiation test chamber and exposed to the light source in accordance with GB / T16422.3-2022. The tear strength of the samples before and after the experiment was measured, and the tear strength reduction rate was calculated. The test results are shown in Table 1:

[0084] Table 1

[0085] project Elongation at break / % Breaking strength / MPa Reduction rate of breaking strength / % Example 1 310.3 16.7 5.75 Example 2 309.6 16.3 5.81 Example 3 306.8 16.6 5.93 Example 4 308.6 16.2 5.88 Comparative Example 1 284.6 12.1 5.87 Comparative Example 2 308.4 16.7 9.53

[0086] The test results in Table 1 show that the methods of Examples 1-4 can effectively improve the mechanical properties and weather resistance of fire hose materials. Comparison of Comparative Example 1 with Examples 1-4 shows that the addition of modified polyamide particles can effectively improve the mechanical properties of fire hose materials; and comparison of Comparative Example 2 with Examples 1-4 shows that the addition of a composite weathering agent can effectively improve the weather resistance of fire hose materials.

[0087] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0088] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a high-strength fire hose material, characterized in that: The following steps are involved: Step 1: After drying the thermoplastic polyurethane particles and the modified polyamide particles, they are mixed with a compatibilizer, and then added to an extruder for melt blending, extrusion, cooling, and shaping to obtain an inner lining pipe; Step 2: Heating the surface of the inner lining pipe, and then weaving the aramid fiber coated with the epoxy-based sizing agent onto the outer surface of the inner lining pipe to obtain an inner lining layer-reinforcement layer pre-composite pipe; Step 3: After mixing the thermoplastic polyurethane particles with the composite weathering agent, add them into the extruder, and then wrap them on the surface of the lining layer-reinforcement layer pre-composite pipe, heat treat, shape, and cool to obtain a high-strength fire hose material.

2. The method for preparing a high-strength fire hose material according to claim 1, characterized in that: In the step 1, the amount ratio of the thermoplastic polyurethane particles, the modified polyamide particles and the compatibilizer is (70-80) g: (20-25) g: (3-8) g, the feeding zone temperature of the extruder is 160-170° C., the compression zone temperature is 192-198° C., the metering zone temperature is 208-212° C., and the die head temperature is 202-207° C.; in the step 2, the epoxy wetting agent is obtained by mixing 40-60 g of epoxy resin emulsion, 2-4 g of silane coupling agent KH-550 and 50-64 g of distilled water, and a mixed solution of 3-5 g of thermoplastic polyurethane and 0.45-0.75 mL of butanone is sprayed during the weaving process; in the step 3, the amount ratio of the thermoplastic polyurethane particles and the composite weathering agent is (30-40) g: (2-5) g.

3. The method for preparing a high-strength fire hose material according to claim 1, characterized in that: The preparation method of the modified polyamide particles, The following steps are involved: Q1: Add diphenylglycolic acid and phthalic anhydride to a container, introduce nitrogen, then add N,N-dimethylformamide, triethylborane, 1,8-diazabicyclo[5.4.0]undec-7-ene and cyclohexene oxide in sequence, heat in an oil bath and magnetically stir to react. After the reaction is completed, cool, add acetic acid to quench the reaction, precipitate, wash, and freeze-dry to obtain compound 1; Q2: Add 2-methyl-3-nitrobenzoic acid to a container containing thionyl chloride and N,N-dimethylformamide, stir and heat to react, purify to obtain a dark red liquid; add N-methyl-4-nitrobenzene-1,2-diamine, triethylamine and tetrahydrofuran to the container, add the dark red liquid dropwise under stirring in an ice bath, after the addition is complete, react at room temperature, purify to obtain a yellow monomer; add the yellow monomer, p-toluenesulfonic acid monohydrate and acetic acid to the container, heat and reflux to react, purify to obtain white crystals; add the white crystals, Pd / C and ethanol to the container, heat and react, then add hydrazine hydrate dropwise, stir and react, purify to obtain compound 2; Q3: Compound 2 is added to N,N-dimethylacetamide, and after stirring and mixing, compound 1 is added, and the mixture is dried, heated, and crushed to obtain modified polyamide particles.

4. The method for preparing a high-strength fire hose material according to claim 3, characterized in that: In Q1, the usage ratio of diphenylglycolic acid, phthalic anhydride, N,N-dimethylformamide, triethylboron, 1,8-diazabicyclo[5.4.0]undec-7-ene and cyclohexene oxide is (0.31-0.47) g: (2.12-3) g: (8-12) mL: (0.15-0.196) g: (0.023-0.029) mL: (1.71-1.79) mL.

5. The method for preparing a high-strength fire hose material according to claim 3, characterized in that: In Q2, the amount ratio of 2-methyl-3-nitrobenzoic acid, thionyl chloride and N,N-dimethylformamide is (6-8) g: (48-52) mL: (0.8-1.1) mL; the amount ratio of N-methyl-4-nitrobenzene-1,2-diamine, triethylamine, tetrahydrofuran and dark red liquid is (4.82-5.04) g: (3.81-4.03) g: (48-52) mL: (6.92-7.36) g, and the reaction is carried out at room temperature. The reaction time is 20-24h; the usage ratio of yellow monomer, p-toluenesulfonic acid monohydrate and acetic acid is (8.12-8.56)g:(7.11-7.29)g:(80-86.8)mL, the reflux reaction temperature is 110-130℃, and the reaction time is 6-8h; the usage ratio of white crystals, Pd / C, ethanol and hydrazine hydrate is (4-6)g:(0.3-0.7)g:(45-55)mL:(7.2-8.8)g.

6. The method for preparing a high-strength fire hose material according to claim 3, characterized in that: In Q3, the usage ratio of compound 2, N,N-dimethylacetamide and compound 1 is (1.01-1.23) g: (5.12-6.04) g: (0.93-0.98) g.

7. The method for preparing a high-strength fire hose material according to claim 1, characterized in that: The preparation method of the composite weathering agent comprises the following steps: S1: Potassium hydroxide is added to a container containing ethanol and distilled water, followed by benzaldehyde and acetone. After stirring at room temperature, the mixture is filtered, washed, and recrystallized to obtain intermediate A. S2: Add benzotriazole, intermediate A, cesium carbonate and dichloromethane to a container in sequence, stir and react at room temperature. After the reaction is completed, extract, dry, concentrate by rotary evaporation, and purify to obtain a composite weathering agent.

8. The method for preparing a high-strength fire hose material according to claim 7, characterized in that: In the S1, the usage ratio of potassium hydroxide, ethanol, distilled water, benzaldehyde and acetone is (0.5-0.9) g: (7-8.2) mL: (8-10) mL: (1.01-1.11) g: (0.21-0.37) g.

9. The method for preparing a high-strength fire hose material according to claim 7, characterized in that: In the S2, the usage ratio of benzotriazole, intermediate A, cesium carbonate and dichloromethane is (0.32-0.51) g: (0.48-0.54) g: (0.14-0.18) g: (20-30) mL.

10. A high-strength fire hose material prepared by the method according to any one of claims 1 to 9.

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