Production process of high-strength steel wire rope core flame-retardant conveying belt for mine

Abstract

The invention discloses a production process of a high-strength steel wire rope core flame-retardant conveying belt for a mine, which comprises the following steps: adding PVC master batch, modified filler, a reinforcing agent and benzoyl peroxide into an internal mixer, carrying out internal mixing treatment to obtain pretreated PVC, adding the pretreated PVC and a boron trifluoride-monoethylamine complex into a double-screw extruder, extruding, placing on the surface of a modified conveying belt core, and carrying out extrusion molding to obtain the high-strength steel wire rope core flame-retardant conveying belt for the mine. According to the present invention, the conveying belt can produce phosphoric acid, metaphosphoric acid and polyphosphoric acid during combustion, the organic silicon can produce a large amount of Si-O bonds and Si-C bonds so as to form the compact silicon-carbon layer, and the porous foam rubber carbon layer containing the metal oxide and produced by the composite charcoal is arranged in the silicon-carbon layer so as to form the porous foam rubber carbon layer; the carbon layer on the surface of the conveying belt has a good heat insulation effect, combustible gas is prevented from entering the conveying belt, release of smoke is reduced, and therefore the use safety of the conveying belt is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flame-retardant material preparation, and particularly relates to a production process of a high-strength steel wire rope core flame-retardant conveyor belt for mines.

[0002] In mine exploitation operations, as the core equipment for continuous material transportation, the conveyor belt needs to operate stably for a long time in complex and harsh environments (such as high load, high friction, and flammable gas environment). Traditional mine conveyor belts mostly use fiber-reinforced layers (such as polyester and nylon) as the skeleton material, but their tensile strength and impact resistance are limited, making it difficult to meet the requirements of high strength and tear resistance of the conveyor belt in scenarios such as deep well mining and long-distance transportation. In recent years, due to its ultra-high strength and low elongation rate, the steel wire rope core has gradually become the preferred reinforcing material for high-strength conveyor belts. At present, the rubber or polymer material coated on the surface of the steel wire rope core conveyor belt has poor flame retardancy. When encountering an open flame, it will burn rapidly and release a large amount of smoke, greatly reducing the safety of mine exploitation operations. Summary of the Invention

[0003] The purpose of the present invention is to provide a production process of a high-strength steel wire rope core flame-retardant conveyor belt for mines, which solves the problems of poor flame retardant effect of the current conveyor belt material and the generation of a large amount of smoke during combustion.

[0004] The purpose of the present invention can be achieved by the following technical solutions: A production process of a high-strength steel wire rope core flame-retardant conveyor belt for mines specifically includes the following steps: Step A1: Clean and degrease the steel wire rope with No. 120 gasoline, polish to remove the oxide layer, and then integrally braid to obtain a conveyor belt core. Spray 3-aminopropyltriethoxysilane on the conveyor belt core, and under the conditions of a temperature of 60 - 70 °C and a humidity of 70 - 75%, perform heat preservation treatment for 10 - 15 min to obtain a modified conveyor belt core; Step A2: Mix castor oil, acidic alumina, urea, and acetic acid evenly. Under the conditions of a rotation speed of 300 - 500 r / min and a temperature of 50 - 55 °C, stir and add hydrogen peroxide, heat up to 65 - 70 °C, and react for 12 - 15 h to obtain epoxy castor oil. Mix epoxy castor oil, acryloyl chloride, triethylamine, and tetrahydrofuran, and under the conditions of a rotation speed of 200 - 300 r / min and a temperature of 30 - 40 °C, react for 3 - 5 h to obtain an enhancer; Step A3: Add PVC masterbatch, modified filler, reinforcing agent and benzoyl peroxide into a kneader. Under the conditions of a rotation speed of 40 - 60 r / min and a temperature of 160 - 170 °C, knead for 15 - 20 min to obtain pretreated PVC. Add the pretreated PVC and boron trifluoride - monoethylamine complex into a twin - screw extruder. Under the conditions of 185 - 195 °C in the feeding section, 175 - 185 °C in the plasticizing section, and 180 - 190 °C in the die section, extrude and place it on the surface of the modified conveyor belt core. Under the conditions of a temperature of 160 - 170 °C and a pressure of 8 - 10 kN, conduct hot - pressing treatment for 30 - 40 min to obtain a high - strength steel wire rope core flame - retardant conveyor belt for mines.

[0005] Furthermore, the molar ratio of the double bond on the castor oil, acetic acid and hydrogen peroxide in Step A2 is 1:1.2:2.5. The dosage of acidic alumina is 10% of the mass of castor oil, and the dosage of urea is 3‰ of the mass of castor oil. The molar ratio of the hydroxyl group on epoxy castor oil, acryloyl chloride and triethylamine is 1:1:1.1.

[0006] Furthermore, the weight - part ratio of the PVC masterbatch, modified filler, reinforcing agent, benzoyl peroxide and boron trifluoride - monoethylamine complex in Step A3 is 100 - 120:15 - 25:8 - 12:1 - 1.2:0.3 - 0.5, and the K value of the PVC masterbatch is 60.

[0007] Furthermore, the modified filler is prepared by the following steps: Step B1: Mix cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate and deionized water evenly. Under the conditions of a frequency of 20 - 30 kHz and a temperature of 20 - 25 °C, perform ultrasonic treatment for 10 - 15 min, and then under the condition of a pressure of 0.5 - 0.8 Mpa, perform pressure - holding treatment for 30 - 40 min. Filter to remove the filtrate, dry the substrate and place it in a tubular heating furnace. Under the conditions of a heating rate of 2 - 5 °C and a nitrogen atmosphere, heat up to 750 - 800 °C and perform heat - preservation treatment for 3 - 5 h to obtain composite biochar; Step B2: Mix hexachlorocyclotriphosphazene, 4 - vinylphenol, triethylamine and toluene. Under the conditions of a rotation speed of 150 - 200 r / min and a temperature of 110 - 115 °C, carry out a reaction for 20 - 25 h to obtain an intermediate. Mix the intermediate, 3 - mercaptopropyltrimethoxysilane, benzophenone and DMF, introduce nitrogen protection, and under the conditions of a rotation speed of 120 - 150 r / min, a temperature of 25 - 30 °C, and 365 nm ultraviolet light irradiation, carry out a reaction for 10 - 15 h to obtain a modified monomer; Step B3: Mix the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, and DMF, stir and add deionized water and hydrochloric acid under the conditions of a rotation speed of 200 - 300 r / min and a temperature of 65 - 70 °C, react for 3 - 5 h, then raise the temperature to 120 - 125 °C and react for 6 - 8 h to obtain the modified filler.

[0008] Furthermore, the dosage ratio of the cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate, and deionized water described in Step B1 is 1 g : 2 mmol : 2 mmol : 50 mL.

[0009] Furthermore, the molar ratio of hexachlorocyclotriphosphazene, 4-vinylphenol, and triethylamine described in Step B2 is 1 : 6 : 6.2, the molar ratio of the intermediate and 3-mercaptopropyltrimethoxysilane is 1 : 6, and the dosage of benzophenone is 2% of the mass of 3-mercaptopropyltrimethoxysilane.

[0010] Furthermore, the dosage ratio of the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, deionized water, and hydrochloric acid described in Step B3 is 2 g : 8 mmol : 10 mmol : 6 mmol : 3 mmol : 10 mL : 1 mL.

[0011] The beneficial effects of the present invention: A high-strength steel wire rope core flame-retardant conveyor belt for mine use prepared by the present invention adds PVC masterbatch, modified filler, reinforcing agent, and benzoyl peroxide into a mixer and performs kneading treatment to obtain pretreated PVC. Then, the pretreated PVC and boron trifluoride - monoethylamine complex are added into a twin-screw extruder, extruded and placed on the surface of the modified conveyor belt core, and hot-pressed to obtain the conveyor belt. The modified conveyor belt core is made of steel wire rope, degreased by washing with No. 120 gasoline, polished to remove the surface oxide layer, and then integrally woven to obtain the conveyor belt core. The conveyor belt core is surface-treated with 3-aminopropyltriethoxysilane to graft amino groups on the surface to obtain the modified conveyor belt core.

[0012] The reinforcing agent is made from castor oil, cured with acetic acid and hydrogen peroxide to convert the double bond into an epoxy group to obtain epoxy castor oil. Then, epoxy castor oil reacts with acryloyl chloride so that the hydroxyl group on epoxy castor oil reacts with the acyl chloride on acryloyl chloride to obtain the reinforcing agent.

[0013] The modified filler is prepared by mixing cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate and deionized water evenly. Through ultrasonic treatment, cobalt nitrate hexahydrate and zinc nitrate hexahydrate enter the voids of cellulose. Then, it is heated at high temperature under a nitrogen atmosphere to form biochar doped with cobalt and zinc, and the composite biochar is obtained. React hexachlorocyclotriphosphazene with 4-vinylphenol, so that the chlorine atom sites on hexachlorocyclotriphosphazene react with the phenolic hydroxyl groups on 4-vinylphenol to obtain an intermediate. React the intermediate with 3-mercaptopropyltrimethoxysilane under ultraviolet irradiation, so that the double bond on the intermediate reacts with the mercapto group on 3-mercaptopropyltrimethoxysilane to obtain a modified monomer. Mix and react the composite biochar, the modified monomer, dimethyldiethoxysilane and 3-methacryloxypropyltrimethoxysilane. The siloxanes on the modified monomer, dimethyldiethoxysilane and 3-methacryloxypropyltrimethoxysilane are hydrolyzed to form silanol groups, and then condense on the surface of the composite biochar to form an organosilicon coating, and the modified filler is obtained.

[0014] During the internal mixing process, the double bonds on the surface of the modified filler and the double bonds on the reinforcing agent can graft with the PVC masterbatch molecules under the action of benzoyl peroxide. At the same time, during the hot pressing process, the epoxy groups on the pretreated PVC molecular chains react with the amino groups on the modified conveyor belt core under the action of boron trifluoride-monoethylamine complex, thereby increasing the crosslinking sites and enhancing the durability of the conveyor belt. When the conveyor belt burns, phosphoric acid, metaphosphoric acid and polyphosphoric acid will be generated, and a large number of Si-O bonds and Si-C bonds are generated by the organosilicon, thereby forming a dense silicon-carbon layer. Inside the silicon-carbon layer is a porous foam carbon layer containing metal oxides generated by the composite biochar, so that the carbon layer on the surface of the conveyor belt has a good heat insulation effect, isolates the entry of combustible gases, reduces the release of smoke, and thus increases the use safety of the conveyor belt. Detailed implementation mode

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0016] Example 1, a production process of a high-strength steel wire rope core flame-retardant conveyor belt for mines, specifically includes the following steps: Step A1: After cleaning and degreasing the steel wire rope with No. 120 gasoline, grinding to remove the oxide layer, and then overall weaving to obtain a conveyor belt core. Spray 3-aminopropyltriethoxysilane on the conveyor belt core and keep it warm for 10 minutes under the conditions of a temperature of 60°C and a humidity of 70% to obtain a modified conveyor belt core; Step A2: Mix castor oil, acidic alumina, urea, and acetic acid evenly. Under the conditions of a rotation speed of 300 r / min and a temperature of 50 °C, stir and add hydrogen peroxide, then raise the temperature to 65 °C and react for 12 h to obtain epoxidized castor oil. Mix epoxidized castor oil, acryloyl chloride, triethylamine, and tetrahydrofuran, and react for 3 h under the conditions of a rotation speed of 200 r / min and a temperature of 30 °C to obtain a strengthening agent; Step A3: Add PVC masterbatch, modified filler, strengthening agent, and benzoyl peroxide into a kneader. Knead for 15 min under the conditions of a rotation speed of 40 r / min and a temperature of 160 °C to obtain pretreated PVC. Add the pretreated PVC and boron trifluoride-monoethylamine complex into a twin-screw extruder, and extrude under the conditions of 185 °C in the feeding section, 175 °C in the plasticizing section, and 180 °C in the die section, then place it on the surface of a modified conveyor belt core. Under the conditions of a temperature of 160 °C and a pressure of 8 kN, perform hot pressing treatment for 30 min to obtain a high-strength steel wire rope core flame-retardant conveyor belt for mine use.

[0017] The molar ratio of the double bond on the castor oil, acetic acid, and hydrogen peroxide in Step A2 is 1:1.2:2.5. The dosage of acidic alumina is 10% of the mass of castor oil, and the dosage of urea is 3‰ of the mass of castor oil. The molar ratio of the hydroxyl group on epoxidized castor oil, acryloyl chloride, and triethylamine is 1:1:1.1.

[0018] The weight ratio of the PVC masterbatch, modified filler, strengthening agent, benzoyl peroxide, and boron trifluoride-monoethylamine complex in Step A3 is 100:15:8:1:0.3, and the K value of the PVC masterbatch is 60.

[0019] The described modified filler is prepared by the following steps: Step B1: Mix cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate, and deionized water evenly. Under the conditions of a frequency of 20 kHz and a temperature of 20 °C, perform ultrasonic treatment for 10 min, then under the condition of a pressure of 0.5 Mpa, perform pressure holding treatment for 30 min, filter to remove the filtrate, dry the substrate, and place it in a tube furnace. Under the conditions of a heating rate of 2 °C and a nitrogen atmosphere, raise the temperature to 750 °C and perform heat preservation treatment for 3 h to obtain composite biochar; Step B2: Mix hexachlorocyclotriphosphazene, 4-vinylphenol, triethylamine, and toluene, and react for 20 h under the conditions of a rotation speed of 150 r / min and a temperature of 110 °C to obtain an intermediate. Mix the intermediate, 3-mercaptopropyltrimethoxysilane, benzophenone, and DMF, introduce nitrogen protection, and react for 10 h under the conditions of a rotation speed of 120 r / min, a temperature of 25 °C, and 365 nm ultraviolet light irradiation to obtain a modified monomer; Step B3: Mix the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, and DMF. Under the conditions of a rotation speed of 200 r / min and a temperature of 65 °C, stir and add deionized water and hydrochloric acid. After reacting for 3 h, raise the temperature to 120 °C and react for 6 h to obtain the modified filler.

[0020] The dosage ratio of the cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate, and deionized water described in Step B1 is 1 g: 2 mmol: 2 mmol: 50 mL.

[0021] The molar ratio of the hexachlorocyclotriphosphazene, 4-vinylphenol, and triethylamine described in Step B2 is 1: 6: 6.2. The molar ratio of the intermediate and 3-mercaptopropyltrimethoxysilane is 1: 6. The dosage of benzophenone is 2% of the mass of 3-mercaptopropyltrimethoxysilane.

[0022] The dosage ratio of the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, deionized water, and hydrochloric acid described in Step B3 is 2 g: 8 mmol: 10 mmol: 6 mmol: 3 mmol: 10 mL: 1 mL.

[0023] Example 2, a production process for a high-strength steel wire rope core flame-retardant conveyor belt for mine use, specifically includes the following steps: Step A1: After cleaning and degreasing the steel wire rope with No. 120 gasoline, polish to remove the oxide layer, and then integrally braid to obtain the conveyor belt core. Spray 3-aminopropyltriethoxysilane on the conveyor belt core and perform heat preservation treatment for 15 min under the conditions of a temperature of 65 °C and a humidity of 70% to obtain the modified conveyor belt core. Step A2: Mix the castor oil, acidic alumina, urea, and acetic acid evenly. Under the conditions of a rotation speed of 300 r / min and a temperature of 55 °C, stir and add hydrogen peroxide, raise the temperature to 65 °C, and react for 14 h to obtain epoxy castor oil. Mix the epoxy castor oil, acryloyl chloride, triethylamine, and tetrahydrofuran, and react for 4 h under the conditions of a rotation speed of 200 r / min and a temperature of 35 °C to obtain the enhancer. Step A3: Add the PVC masterbatch, modified filler, enhancer, and benzoyl peroxide into a kneader and knead for 18 min under the conditions of a rotation speed of 40 r / min and a temperature of 165 °C to obtain the pretreated PVC. Add the pretreated PVC and boron trifluoride-monoethylamine complex into a twin-screw extruder and extrude it onto the surface of the modified conveyor belt core under the conditions of 190 °C in the feeding section, 180 °C in the plasticizing section, and 185 °C in the die section. Then, perform hot pressing treatment for 35 min under the conditions of a temperature of 165 °C and a pressure of 9 kN to obtain the high-strength steel wire rope core flame-retardant conveyor belt for mine use.

[0024] The molar ratio of the double bond on the castor oil, acetic acid and hydrogen peroxide described in step A2 is 1:1.2:2.5. The dosage of acidic alumina is 10% of the mass of castor oil, and the dosage of urea is 3‰ of the mass of castor oil. The molar ratio of the hydroxyl group on epoxy castor oil, acryloyl chloride and triethylamine is 1:1:1.1.

[0025] The weight ratio of the PVC masterbatch, modified filler, reinforcing agent, benzoyl peroxide and boron trifluoride-monoethylamine complex described in step A3 is 110:20:10:1.1:0.4, and the K value of the PVC masterbatch is 60.

[0026] The described modified filler is prepared by the following steps: Step B1: Mix cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate and deionized water evenly. Under the conditions of a frequency of 25 kHz and a temperature of 20 °C, after ultrasonic treatment for 10 min, and then under the condition of a pressure of 0.6 Mpa, keep the pressure for 35 min, filter to remove the filtrate, dry the substrate and place it in a tubular heating furnace. Under the conditions of a heating rate of 3 °C and a nitrogen atmosphere, heat up to 780 °C and keep the temperature for 4 h to obtain composite biochar; Step B2: Mix hexachlorocyclotriphosphazene, 4-vinylphenol, triethylamine and toluene, and react at a rotation speed of 150 r / min and a temperature of 115 °C for 20 h to obtain an intermediate. Mix the intermediate, 3-mercaptopropyltrimethoxysilane, benzophenone and DMF, introduce nitrogen protection, and react at a rotation speed of 120 r / min, a temperature of 30 °C and under the irradiation of 365 nm ultraviolet light for 10 h to obtain a modified monomer; Step B3: Mix the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane and DMF, stir at a rotation speed of 300 r / min and a temperature of 65 °C, add deionized water and hydrochloric acid, react for 4 h, then heat up to 120 °C and react for 7 h to obtain the modified filler.

[0027] The dosage ratio of the cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate and deionized water described in step B1 is 1 g:2 mmol:2 mmol:50 mL.

[0028] The molar ratio of hexachlorocyclotriphosphazene, 4-vinylphenol and triethylamine described in step B2 is 1:6:6.2. The molar ratio of the intermediate and 3-mercaptopropyltrimethoxysilane is 1:6, and the dosage of benzophenone is 2% of the mass of 3-mercaptopropyltrimethoxysilane.

[0029] The dosage ratio of the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, deionized water and hydrochloric acid described in step B3 is 2 g: 8 mmol: 10 mmol: 6 mmol: 3 mmol: 10 mL: 1 mL.

[0030] Example 3, a production process of a high-strength steel wire rope core flame-retardant conveyor belt for mines, specifically includes the following steps: Step A1: After cleaning and degreasing the steel wire rope with No. 120 gasoline, polishing to remove the oxide layer, and then integrally weaving to obtain a conveyor belt core, spraying 3-aminopropyltriethoxysilane on the conveyor belt core, and performing heat preservation treatment for 15 min under the conditions of a temperature of 70 °C and a humidity of 75% to obtain a modified conveyor belt core; Step A2: Mix castor oil, acidic alumina, urea and acetic acid evenly, stir and add hydrogen peroxide under the conditions of a rotation speed of 500 r / min and a temperature of 55 °C, raise the temperature to 70 °C, and react for 15 h to obtain epoxy castor oil. Mix epoxy castor oil, acryloyl chloride, triethylamine and tetrahydrofuran, and react for 5 h under the conditions of a rotation speed of 300 r / min and a temperature of 40 °C to obtain a reinforcing agent; Step A3: Add PVC masterbatch, modified filler, reinforcing agent and benzoyl peroxide into a kneader, knead for 20 min under the conditions of a rotation speed of 60 r / min and a temperature of 170 °C to obtain pretreated PVC. Add the pretreated PVC and boron trifluoride-monoethylamine complex into a twin-screw extruder, extrude under the conditions of a feeding section temperature of 195 °C, a plasticizing section temperature of 185 °C, and a die section temperature of 190 °C and place it on the surface of the modified conveyor belt core, and perform hot pressing treatment for 40 min under the conditions of a temperature of 170 °C and a pressure of 10 kN to obtain a high-strength steel wire rope core flame-retardant conveyor belt for mines.

[0031] The molar ratio of the double bond on the castor oil, acetic acid and hydrogen peroxide described in step A2 is 1: 1.2: 2.5, the dosage of acidic alumina is 10% of the mass of castor oil, the dosage of urea is 3‰ of the mass of castor oil, and the molar ratio of the hydroxyl group on epoxy castor oil, acryloyl chloride and triethylamine is 1: 1: 1.1.

[0032] The weight part ratio of the PVC masterbatch, modified filler, reinforcing agent, benzoyl peroxide and boron trifluoride-monoethylamine complex described in step A3 is 120: 25: 12: 1.2: 0.5, and the K value of the PVC masterbatch is 60.

[0033] The described modified filler is made by the following steps: Step B1: Mix cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate and deionized water evenly. Under the conditions of a frequency of 30 kHz and a temperature of 25 °C, after ultrasonic treatment for 15 min, and then under the condition of a pressure of 0.8 Mpa, keep the pressure for 40 min, filter to remove the filtrate, dry the substrate and place it in a tube furnace. Under the conditions of a heating rate of 5 °C and a nitrogen atmosphere, heat up to 800 °C and keep warm for 5 h to obtain the composite biochar; Step B2: Mix hexachlorocyclotriphosphazene, 4-vinylphenol, triethylamine and toluene, and react for 25 h under the conditions of a rotation speed of 200 r / min and a temperature of 115 °C to obtain an intermediate. Mix the intermediate, 3-mercaptopropyltrimethoxysilane, benzophenone and DMF, introduce nitrogen protection, and react for 15 h under the conditions of a rotation speed of 150 r / min, a temperature of 30 °C and 365 nm ultraviolet light irradiation to obtain the modified monomer; Step B3: Mix the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane and DMF, stir at a rotation speed of 300 r / min and a temperature of 70 °C, add deionized water and hydrochloric acid, react for 5 h, then heat up to 125 °C and react for 8 h to obtain the modified filler.

[0034] The dosage ratio of the cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate and deionized water described in Step B1 is 1 g: 2 mmol: 2 mmol: 50 mL.

[0035] The molar ratio of the hexachlorocyclotriphosphazene, 4-vinylphenol and triethylamine described in Step B2 is 1: 6: 6.2, the molar ratio of the intermediate and 3-mercaptopropyltrimethoxysilane is 1: 6, and the dosage of benzophenone is 2% of the mass of 3-mercaptopropyltrimethoxysilane.

[0036] The dosage ratio of the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, deionized water and hydrochloric acid described in Step B3 is 2 g: 8 mmol: 10 mmol: 6 mmol: 3 mmol: 10 mL: 1 mL.

[0037] Comparative Example 1: This comparative example is the same as Example 1 except that no enhancer is added.

[0038] Comparative Example 2: This comparative example is the same as Example 1 except that the product obtained by drying cellulose and placing it in a tube furnace, heating up to 750 °C at a heating rate of 2 °C under a nitrogen atmosphere and keeping warm for 3 h is used to replace the composite biochar.

[0039] Comparative Example 3: Compared with Example 1, 3-methacryloxypropyltrimethoxysilane was not added in this comparative example, and the remaining steps were the same.

[0040] Comparative Example 4: Compared with Example 1, composite biochar was not added in this comparative example, and the remaining steps were the same.

[0041] The materials prepared by extrusion of Examples 1-3 and Comparative Examples 1-4 were made into specimens of 130 mm×13 mm×4 mm. According to the standard of GB / T2408-2021, the vertical burning grade was detected. Specimens of 75 mm×75 mm×5 mm were made according to the standard of ISO5659-2. Under the condition of a power of 25 kW / m 2 , the maximum smoke release rate and smoke release amount were detected, and the detection results are shown in Table 1 below.

[0042] Table 1

[0043] It can be seen from Table 1 that the present application has a good flame retardant effect and an excellent smoke suppression effect.

[0044] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the concept of the invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

Claims

1. A production process for a high-strength steel wire rope core flame-retardant conveyor belt for mines, characterized in that: Specifically, it includes the following steps: Step A1: After cleaning and degreasing the steel wire rope with No. 120 gasoline, grinding to remove the oxide layer, and then integrally braiding, a conveyor belt core is obtained. 3-aminopropyltriethoxysilane is sprayed on the conveyor belt core and subjected to heat preservation treatment to obtain a modified conveyor belt core; Step A2: Castor oil, acidic alumina, urea and acetic acid are mixed and stirred, and hydrogen peroxide is added. The temperature is raised for reaction to obtain epoxy castor oil. Epoxy castor oil, acryloyl chloride, triethylamine and tetrahydrofuran are mixed and reacted to obtain a reinforcing agent; Step A3: PVC masterbatch, modified filler, reinforcing agent and benzoyl peroxide are added to a kneader for kneading treatment to obtain pretreated PVC. The pretreated PVC and boron trifluoride-monoethylamine complex are added to a twin-screw extruder, extruded and placed on the surface of the modified conveyor belt core, and subjected to hot pressing treatment to obtain a high-strength steel wire rope core flame-retardant conveyor belt for mines.

2. The production process of a high-strength steel wire rope core flame-retardant conveyor belt for mine use according to claim 1, characterized in that: In step A2, the molar ratio of the double bond on the castor oil, acetic acid and hydrogen peroxide is 1:1.2:2.

5. The dosage of acidic alumina is 10% of the mass of castor oil, and the dosage of urea is 3‰ of the mass of castor oil. The molar ratio of the hydroxyl group on the epoxy castor oil, acryloyl chloride and triethylamine is 1:1:1.

1.

3. The production process of a high-strength steel wire rope core flame-retardant conveyor belt for mine use according to claim 1, characterized in that: In step A3, the weight ratio of the PVC masterbatch, modified filler, reinforcing agent, benzoyl peroxide and boron trifluoride-monoethylamine complex is 100-120:15-25:8-12:1-1.2:0.3-0.

5.

4. A production process of a high-strength steel wire rope core flame-retardant conveyor belt for mine use according to claim 1, characterized in that: The modified filler is prepared by the following steps: Step B1: Cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate and deionized water are mixed and subjected to ultrasonic treatment, then pressure-holding treatment, and the filtrate is removed by filtration. The substrate is dried and placed in a tube furnace, and the temperature is raised for heat preservation treatment to obtain composite biochar; Step B2: Hexachlorocyclotriphosphazene, 4-vinylphenol, triethylamine and toluene are mixed and reacted to obtain an intermediate. The intermediate, 3-mercaptopropyltrimethoxysilane, benzophenone and DMF are mixed, and nitrogen is introduced for protection and reaction to obtain a modified monomer; Step B3: The composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane and DMF are mixed and stirred, and deionized water and hydrochloric acid are added for reaction to obtain a modified filler.

5. The production process of a high-strength steel wire rope core flame-retardant conveyor belt for mine use according to claim 4, characterized in that: In step B1, the dosage ratio of cellulose, cobalt nitrate hexahydrate, zinc nitrate hexahydrate and deionized water is 1g:2mmol:2mmol:50mL.

6. The production process of a high-strength steel wire rope core flame-retardant conveyor belt for mine use according to claim 4, characterized in that: In step B2, the molar ratio of hexachlorocyclotriphosphazene, 4-vinylphenol and triethylamine is 1:6:6.2, and the molar ratio of the intermediate and 3-mercaptopropyltrimethoxysilane is 1:

6.

7. The production process of a high-strength steel wire rope core flame-retardant conveyor belt for mine use according to claim 4, characterized in that: In step B3, the dosage ratio of the composite biochar, modified monomer, methyltriethoxysilane, dimethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, deionized water and hydrochloric acid is 2g:8mmol:10mmol:6mmol:3mmol:10mL:1mL.

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