Graphene modified whole-core flame-retardant conveying belt for coal mine and preparation method of graphene modified whole-core flame-retardant conveying belt

Abstract

The invention belongs to the technical field of new materials of conveying belts, and discloses a graphene modified whole-core flame-retardant conveying belt for a coal mine and a preparation method of the graphene modified whole-core flame-retardant conveying belt. Comprising mixed rubber and a polyester fabric located in mixed liquid, and the mixed rubber is prepared from, by weight, 100-120 parts of chloroprene rubber, 20-30 parts of hydrogenated nitrile rubber, 5-10 parts of graphene composite particles, 1-3 parts of magnesium hydroxide and 1-3 parts of dioctyl terephthalate. The conveyor belt prepared by the invention not only has relatively high mechanical strength and tear resistance, but also has good flame retardant property.

Description

Technical Field

[0001] The invention relates to the technical field of new materials for conveyor belts, and in particular to a graphene-modified whole-core flame-retardant conveyor belt for coal mines and a preparation method thereof. Background Art

[0002] In the modern transportation industry, with the complexity of the transportation environment and the diversification of material types, the conveyor is developing in the direction of long distance, large capacity, high speed, high efficiency and multi-function, which forces the conveyor belt to develop in the direction of multi-function, variety, light weight, layer reduction and high strength. With the development of my country's heavy industries such as metallurgy, mining, ports, etc., the level of mechanical automation is constantly improving. At the same time, due to the requirements of its transportation operation environment, especially in coal mining, the materials are not only uneven in size, but also have a large drop, and the impact energy of the materials is very large. Under the conditions of the first and second broken and large drop of the material outlet in the mine, the sharp large-size ore impacts the conveyor belt. The ordinary conveyor belt has weak impact resistance and poor tear resistance during transportation and use, which is easy to cause damage or breakdown of the covering rubber layer, longitudinal scratches, tearing and other accidents. In addition, because the conveyor belt is made of rubber, the ordinary conveyor belt is prone to burn, which will not only affect the production efficiency, but also cause serious economic losses to the user unit. Therefore, higher requirements are put forward for the quality of conveyor belts in the field of coal mining. Summary of the invention

[0003] In order to overcome the above technical problems, the present invention provides a graphene-modified whole-core flame-retardant conveyor belt for coal mines and a preparation method thereof. The conveyor belt prepared by the present invention not only has high mechanical strength and tear resistance, but also has good flame retardant properties.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A graphene-modified whole-core flame-retardant conveyor belt for coal mines, comprising a mixed rubber and a polyester fabric located inside the mixed liquid, wherein the mixed rubber comprises the following components in parts by weight: 100-120 parts of chloroprene rubber, 20-30 parts of hydrogenated nitrile rubber, 5-10 parts of graphene composite particles, 1-3 parts of magnesium hydroxide, and 1-3 parts of dioctyl terephthalate.

[0005] The present invention uses chloroprene rubber and hydrogen nitrile rubber as main raw materials, and polyester fabric as the skeleton structure of rubber material. Graphene has extremely high strength and modulus, and its strength can reach 130GPa, and its modulus can reach 1TPa. These characteristics enable graphene to effectively transmit stress, improve the overall strength of rubber composite materials, and improve the mechanical strength and tear resistance of conveyor belt by doping graphene composite particles in raw materials. Magnesium hydroxide is used as the flame retardant component of conveyor belt. Magnesium hydroxide will undergo decomposition reaction when heated to generate magnesium oxide and water. This decomposition process is endothermic, which means that it needs to absorb surrounding heat, thereby reducing the temperature of the material, slowing down or preventing the combustion process. Dioctyl terephthalate is used as the plasticizer of conveyor belt. Dioctyl terephthalate, as a plasticizer, can be inserted between rubber molecular chains to weaken these intermolecular interactions, thereby reducing the melt viscosity and Tg of rubber, and increasing its fluidity and softness.

[0006] Preferably, the method for preparing the graphene composite particles comprises the following steps: (1) adding γ-aminopropyltriethoxysilane to a mixed solution of ethanol and water, heating and stirring, to obtain a silane coupling agent hydrolyzate; (2) adding glass fiber to the hydrolyzate of silane coupling agent, heating and stirring to react, filtering, separating, washing and drying to obtain coupling agent modified glass fiber; (3) Add graphene oxide to deionized water and disperse it evenly by ultrasonic oscillation. Then add coupling agent modified glass fiber, the mass ratio of coupling agent modified glass fiber to graphene oxide is 1:0.5, heat to react, filter, separate, wash and dry to obtain graphene composite particles.

[0007] In the prior art, graphene is usually added alone to a conveyor belt to improve the mechanical strength and tear resistance of the conveyor belt, but this method is limited in improving the mechanical strength and tear resistance of the conveyor belt. The present invention can significantly improve the mechanical strength and tear resistance of the conveyor belt by combining graphene with glass fiber compared to ordinary graphene. Glass fiber itself has very high strength and modulus. When glass fiber is compounded with a rubber matrix, the glass fiber can bear most of the external force, thereby improving the bearing capacity and mechanical strength of the entire composite material. The glass fiber plays the role of "bridging" cracks in the composite material. When the composite material is subjected to external force and cracks are generated, the glass fiber can cross the crack area, prevent or delay the expansion of the crack, thereby improving the tear resistance of the material. The present invention uses the synergistic effect of glass fiber and graphene to significantly improve the mechanical properties and tear resistance of rubber.

[0008] The specific preparation process of the graphene composite particles is to first graft γ-aminopropyltriethoxysilane on the surface of the glass fiber to load the surface of the glass fiber with amino groups, and then use the epoxy functional groups on the surface of the graphene oxide to undergo a ring-opening reaction with the amino groups on the surface of the glass fiber, thereby bonding the graphene oxide to the glass fiber, so that the amount of graphene oxide and glass fiber in each area of ​​the conveyor belt is relatively uniform. Compared with directly adding graphene and glass fiber to the rubber material (one area of ​​the conveyor belt has more graphene, another area has more glass fiber, and the amount of graphene oxide and glass fiber in each area of ​​the conveyor belt is uneven), the mechanical properties and tear resistance of the rubber material can be further improved.

[0009] Preferably, in step (1), the heating and stirring time is 1-3 hours.

[0010] Preferably, in step (2), the heating and stirring reaction time is 2 hours; The mass ratio of glass fiber to gamma-aminopropyltriethoxysilane is 1:0.3-0.6.

[0011] In order to combine a sufficient amount of graphene oxide on the glass fiber, the glass fiber must be grafted with a sufficient amount of γ-aminopropyltriethoxysilane. Therefore, the mass ratio of the glass fiber to the γ-aminopropyltriethoxysilane is controlled to be less than 1:0.3. At that time, when the amount of γ-aminopropyltriethoxysilane used continued to increase, that is, when the mass ratio of glass fiber to γ-aminopropyltriethoxysilane was less than 1:0.6, the present invention team unexpectedly discovered that a large amount of magnesium hydroxide was coated on the glass fiber, and the flame retardant properties of the rubber material decreased significantly, which was unexpected by the present invention team. This may be because when the γ-aminopropyltriethoxysilane on the surface of the glass fiber is excessively grafted, the amino groups on the surface of the glass fiber increase, and the amino groups that undergo ring-opening reaction with the epoxy groups of graphene oxide are excessive. The remaining amino groups form hydrogen bonds with the hydroxyl groups on the magnesium hydroxide, thereby coating the surface of the glass fiber, resulting in poor dispersibility of the magnesium hydroxide flame retardant in the rubber material, and further resulting in a decrease in the flame retardant effect of the rubber. Therefore, the present invention strictly controls the mass ratio of glass fiber to γ-aminopropyltriethoxysilane to be greater than 1:0.6.

[0012] Preferably, in step (3), the heating reaction temperature is 80-85° C., and the heating reaction time is 2-5 h.

[0013] A method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines comprises the following steps: (a) mixing chloroprene rubber and hydrogenated nitrile rubber to obtain a rubber mixture, adding the mixture to an open mill for plastication to obtain a plasticated rubber; (b) adding graphene composite particles, magnesium hydroxide and dioctyl terephthalate to the plasticized rubber, stirring evenly, and then kneading to obtain a mixed rubber; (c) The polyester fabric is immersed in the mixed rubber, the polyester fabric is taken out, the excess mixed liquid on the polyester fabric is taken out by using a squeezing roller, and then the polyester fabric is dried and then vulcanized to obtain the product.

[0014] Preferably, in step (a), the plasticating temperature is controlled at 40-45°C.

[0015] Preferably, in step (b), the mixing time is controlled within 10-20 minutes.

[0016] Preferably, in step (c), the drying temperature is controlled at 70-75°C.

[0017] Preferably, in step (c), the vulcanization temperature is controlled at 130-150° C., and the vulcanization time is 30-60 min.

[0018] The present invention has the following beneficial effects: The present invention uses chloroprene rubber and hydrogenated nitrile rubber as the main raw materials and polyester fabric as the skeleton structure of the rubber material. Graphene has extremely high strength and modulus. These characteristics enable graphene to effectively transmit stress. By doping the raw materials with graphene composite particles, the mechanical strength and tear resistance of the conveyor belt are greatly improved. γ-Aminopropyltriethoxysilane is grafted onto the surface of the glass fiber to load the surface of the glass fiber with amino groups, and then the epoxy functional groups on the surface of the graphene oxide react with the amino groups on the surface of the glass fiber to bond the graphene oxide to the glass fiber. This makes the amount of graphene oxide and glass fiber in each area of ​​the conveyor belt relatively uniform, which can further improve the mechanical properties and tear resistance of the rubber material compared to directly adding graphene and glass fiber to the rubber material. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with specific embodiments. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work should fall within the scope of protection of the present invention.

[0020] Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all methods known to those skilled in the art.

[0021] Specific embodiment 1: A graphene-modified solid-core flame-retardant conveyor belt for coal mines, comprising a mixed rubber and a polyester fabric located inside the mixed liquid, wherein the mixed rubber comprises the following components in parts by weight: 115 parts of chloroprene rubber, 28 parts of hydrogenated nitrile rubber, 9 parts of graphene composite particles, 2 parts of magnesium hydroxide, and 2 parts of dioctyl terephthalate.

[0022] The method for preparing the graphene composite particles comprises the following steps: (1) Add 2 g of γ-aminopropyltriethoxysilane to a mixed solution of 120 mL of ethanol and 50 mL of water, heat to 50 ° C and stir for 1-3 hours to obtain a silane coupling agent hydrolyzate; (2) adding 5 g of glass fiber to the hydrolyzate of silane coupling agent, with the mass ratio of glass fiber to γ-aminopropyltriethoxysilane being 1:0.55, heating to 60° C., stirring and reacting for 2 h, filtering, separating, washing and drying to obtain coupling agent modified glass fiber; (3) 5 g of graphene oxide was added to 300 mL of deionized water and dispersed evenly by ultrasonic oscillation. Then, 10 g of coupling agent-modified glass fiber was added and heated at 83 °C for 3 h. After filtration, separation, washing and drying, graphene composite particles were obtained.

[0023] A method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines comprises the following steps: (a) mixing chloroprene rubber and hydrogenated nitrile rubber to obtain a rubber mixture, adding the mixture to an open mill for plastication, wherein the roller distance of the plasticator is controlled at 3 mm and the plastication temperature is controlled at 45° C. to obtain a plasticized rubber; (b) adding graphene composite particles, magnesium hydroxide and dioctyl terephthalate to the plasticized rubber, stirring evenly, and kneading at a speed of 500 r / min for 15 minutes to obtain a mixed rubber; (c) Immerse the polyester fabric in the mixed rubber, take out the polyester fabric, use an extrusion roller to remove the excess mixed liquid on the polyester fabric, and then dry it at 73°C for 2 hours, and then vulcanize it at a pressure of 6 MPa. The vulcanization temperature is controlled at 140°C and the vulcanization time is 45 minutes.

[0024] Specific embodiment 2: A graphene-modified solid-core flame-retardant conveyor belt for coal mines, comprising a mixed rubber and a polyester fabric located inside the mixed liquid, wherein the mixed rubber comprises the following components in parts by weight: 105 parts of chloroprene rubber, 22 parts of hydrogenated nitrile rubber, 6 parts of graphene composite particles, 2 parts of magnesium hydroxide, and 2 parts of dioctyl terephthalate.

[0025] The method for preparing the graphene composite particles comprises the following steps: (1) Add 2 g of γ-aminopropyltriethoxysilane to a mixed solution of 120 mL of ethanol and 50 mL of water, heat to 50 ° C and stir for 1-3 hours to obtain a silane coupling agent hydrolyzate; (2) adding 5 g of glass fiber into the hydrolyzate of silane coupling agent, with the mass ratio of glass fiber to γ-aminopropyltriethoxysilane being 1:0.4, heating to 60° C., stirring and reacting for 2 h, filtering, separating, washing and drying to obtain coupling agent modified glass fiber; (3) 5 g of graphene oxide was added to 300 mL of deionized water and dispersed evenly by ultrasonic oscillation. Then, 10 g of coupling agent-modified glass fiber was added and heated at 83 °C for 3 h. After filtration, separation, washing and drying, graphene composite particles were obtained.

[0026] A method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines comprises the following steps: (a) mixing chloroprene rubber and hydrogenated nitrile rubber to obtain a rubber mixture, adding the mixture to an open mill for plastication, wherein the roller distance of the plasticator is controlled at 3 mm and the plastication temperature is controlled at 45° C. to obtain a plasticized rubber; (b) adding graphene composite particles, magnesium hydroxide and dioctyl terephthalate to the plasticized rubber, stirring evenly, and kneading at a speed of 500 r / min for 15 minutes to obtain a mixed rubber; (c) Immerse the polyester fabric in the mixed rubber, take out the polyester fabric, use an extrusion roller to remove the excess mixed liquid on the polyester fabric, and then dry it at 73°C for 2 hours, and then vulcanize it at a pressure of 6 MPa. The vulcanization temperature is controlled at 140°C and the vulcanization time is 45 minutes.

[0027] Specific embodiment 3: A graphene-modified solid-core flame-retardant conveyor belt for coal mines, comprising a mixed rubber and a polyester fabric located inside the mixed liquid, wherein the mixed rubber comprises the following components in parts by weight: 110 parts of chloroprene rubber, 25 parts of hydrogenated nitrile rubber, 7 parts of graphene composite particles, 2 parts of magnesium hydroxide, and 2 parts of dioctyl terephthalate.

[0028] The method for preparing the graphene composite particles comprises the following steps: (1) Add 2 g of γ-aminopropyltriethoxysilane to a mixed solution of 120 mL of ethanol and 50 mL of water, heat to 50 ° C and stir for 1-3 hours to obtain a silane coupling agent hydrolyzate; (2) adding 5 g of glass fiber into the hydrolyzate of silane coupling agent, with the mass ratio of glass fiber to γ-aminopropyltriethoxysilane being 1:0.5, heating to 60° C., stirring and reacting for 2 h, filtering, separating, washing and drying to obtain coupling agent modified glass fiber; (3) 5 g of graphene oxide was added to 300 mL of deionized water and dispersed evenly by ultrasonic oscillation. Then, 10 g of coupling agent-modified glass fiber was added and heated at 83 °C for 3 h. After filtration, separation, washing and drying, graphene composite particles were obtained.

[0029] A method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines comprises the following steps: (a) mixing chloroprene rubber and hydrogenated nitrile rubber to obtain a rubber mixture, adding the mixture to an open mill for plastication, wherein the roller distance of the plasticator is controlled at 3 mm and the plastication temperature is controlled at 45° C. to obtain a plasticized rubber; (b) adding graphene composite particles, magnesium hydroxide and dioctyl terephthalate to the plasticized rubber, stirring evenly, and kneading at a speed of 500 r / min for 15 minutes to obtain a mixed rubber; (c) Immerse the polyester fabric in the mixed rubber, take out the polyester fabric, use an extrusion roller to remove the excess mixed liquid on the polyester fabric, and then dry it at 73°C for 2 hours, and then vulcanize it at a pressure of 6 MPa. The vulcanization temperature is controlled at 140°C and the vulcanization time is 40 minutes.

[0030] Specific embodiment 4: A graphene-modified solid-core flame-retardant conveyor belt for coal mines, comprising a mixed rubber and a polyester fabric located inside the mixed liquid, wherein the mixed rubber comprises the following components in parts by weight: 120 parts of chloroprene rubber, 30 parts of hydrogenated nitrile rubber, 10 parts of graphene composite particles, 3 parts of magnesium hydroxide, and 3 parts of dioctyl terephthalate.

[0031] The method for preparing the graphene composite particles comprises the following steps: (1) Add 2 g of γ-aminopropyltriethoxysilane to a mixed solution of 120 mL of ethanol and 50 mL of water, heat to 50 ° C and stir for 1-3 hours to obtain a silane coupling agent hydrolyzate; (2) adding 5 g of glass fiber to the hydrolyzate of silane coupling agent, with the mass ratio of glass fiber to γ-aminopropyltriethoxysilane being 1:0.6, heating to 60° C., stirring and reacting for 2 h, filtering, separating, washing and drying to obtain coupling agent modified glass fiber; (3) 5 g of graphene oxide was added to 300 mL of deionized water and dispersed evenly by ultrasonic oscillation. Then, 10 g of coupling agent-modified glass fiber was added and heated at 85° C. for 5 h. After filtration, separation, washing and drying, graphene composite particles were obtained.

[0032] A method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines comprises the following steps: (a) mixing chloroprene rubber and hydrogenated nitrile rubber to obtain a rubber mixture, adding the mixture to an open mill for plastication, wherein the roller distance of the plasticator is controlled at 3 mm and the plastication temperature is controlled at 45° C. to obtain a plasticized rubber; (b) adding graphene composite particles, magnesium hydroxide and dioctyl terephthalate to the plasticized rubber, stirring evenly, and kneading at a speed of 500 r / min for 20 minutes to obtain a mixed rubber; (c) Immerse the polyester fabric in the mixed rubber, take out the polyester fabric, use an extrusion roller to remove the excess mixed liquid on the polyester fabric, and then dry it at 75°C for 2 hours, and then vulcanize it at a pressure of 6 MPa. The vulcanization temperature is controlled at 150°C and the vulcanization time is 60 minutes.

[0033] Specific embodiment 5: A graphene-modified solid-core flame-retardant conveyor belt for coal mines, comprising a mixed rubber and a polyester fabric located inside the mixed liquid, wherein the mixed rubber comprises the following components in parts by weight: 100 parts of chloroprene rubber, 20 parts of hydrogenated nitrile rubber, 5 parts of graphene composite particles, 1 part of magnesium hydroxide, and 1 part of dioctyl terephthalate.

[0034] The method for preparing the graphene composite particles comprises the following steps: (1) Add 2 g of γ-aminopropyltriethoxysilane to a mixed solution of 120 mL of ethanol and 50 mL of water, heat to 50 ° C and stir for 1-3 hours to obtain a silane coupling agent hydrolyzate; (2) adding 5 g of glass fiber into the hydrolyzate of silane coupling agent, with the mass ratio of glass fiber to γ-aminopropyltriethoxysilane being 1:0.3, heating to 60° C., stirring and reacting for 2 h, filtering, separating, washing and drying to obtain coupling agent modified glass fiber; (3) 5 g of graphene oxide was added to 300 mL of deionized water and dispersed evenly by ultrasonic oscillation. Then, 10 g of coupling agent-modified glass fiber was added and heated at 80° C. for 2 h. After filtration, separation, washing and drying, graphene composite particles were obtained.

[0035] A method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines comprises the following steps: (a) mixing chloroprene rubber and hydrogenated nitrile rubber to obtain a rubber mixture, adding the mixture to an open mill for plastication, wherein the roller distance of the plasticator is controlled at 3 mm and the plastication temperature is controlled at 40° C. to obtain a plasticized rubber; (b) adding graphene composite particles, magnesium hydroxide and dioctyl terephthalate to the plasticized rubber, stirring evenly, and kneading at a speed of 500 r / min for 10 minutes to obtain a mixed rubber; (c) Immerse the polyester fabric in the mixed rubber, take out the polyester fabric, use an extrusion roller to remove the excess mixed liquid on the polyester fabric, and then dry it at 70°C for 2 hours, and then vulcanize it at a pressure of 6MPa. The vulcanization temperature is controlled at 130°C and the vulcanization time is 30 minutes.

[0036] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that: The graphene composite particles were replaced with an equal amount of ordinary graphene; The remaining steps are the same as those in Example 1.

[0037] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is: The graphene composite particles were replaced with a mixture of 5 g of graphene oxide and 10 g of glass fiber; The remaining steps are the same as those in Example 1.

[0038] Comparative Example 3 The difference between Comparative Example 3 and Example 5 is that: The mass ratio of glass fiber to γ-aminopropyltriethoxysilane is 1:0.2. The remaining steps are the same as those in Example 5.

[0039] Comparative Example 4 The difference between Comparative Example 4 and Example 4 is that: The mass ratio of glass fiber to γ-aminopropyltriethoxysilane is 1:0.7. The remaining steps are the same as those in Example 4.

[0040] Comparative Example 5 The difference between Comparative Example 4 and Example 4 is that: The mass ratio of glass fiber to γ-aminopropyltriethoxysilane is 1:0.8. The remaining steps are the same as those in Example 4.

[0041] Comparative Example 6 The difference between Comparative Example 4 and Example 4 is that: The mass ratio of glass fiber to γ-aminopropyltriethoxysilane is 1:0.9. The remaining steps are the same as those in Example 4.

[0042] Performance Testing: The conveyor belts prepared in Examples 1-5 and Comparative Examples 1-6 were subjected to performance tests. The tensile strength of the conveyor belt was tested according to the method specified in GB / T528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". The tear resistance of the conveyor belt was tested according to the method specified in MT914-2008 "Fabric whole core flame-retardant conveyor belt for coal mines". The flame retardant properties of the conveyor belt were tested according to GB / T10707-2008 "Determination of combustion properties of rubber", and the test results are as follows:

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A graphene-modified whole-core flame-retardant conveyor belt for coal mines, characterized in that: The invention comprises a mixed rubber and a polyester fabric located in the mixed liquid, wherein the mixed rubber comprises the following components in parts by weight: 100-120 parts of chloroprene rubber, 20-30 parts of hydrogenated nitrile rubber, 5-10 parts of graphene composite particles, 1-3 parts of magnesium hydroxide, and 1-3 parts of dioctyl terephthalate.

2. The graphene-modified whole-core flame-retardant conveyor belt for coal mines according to claim 1, characterized in that: The method for preparing the graphene composite particles comprises the following steps: (1) adding γ-aminopropyltriethoxysilane to a mixed solution of ethanol and water, heating and stirring, to obtain a silane coupling agent hydrolyzate; (2) adding glass fiber to the hydrolyzate of silane coupling agent, heating and stirring to react, filtering, separating, washing and drying to obtain coupling agent modified glass fiber; (3) Add graphene oxide to deionized water and disperse it evenly by ultrasonic oscillation. Then add coupling agent modified glass fiber, the mass ratio of coupling agent modified glass fiber to graphene oxide is 1:0.5, heat to react, filter, separate, wash and dry to obtain graphene composite particles.

3. The graphene-modified whole-core flame-retardant conveyor belt for coal mines according to claim 2, characterized in that: In the step (1), the heating and stirring time is 1-3 hours.

4. The graphene-modified whole-core flame-retardant conveyor belt for coal mines according to claim 2, characterized in that: In the step (2), the heating and stirring reaction time is 2 hours; The mass ratio of glass fiber to gamma-aminopropyltriethoxysilane is 1:0.3-0.

6.

5. The graphene-modified whole-core flame-retardant conveyor belt for coal mines according to claim 2, characterized in that: In the step (3), the heating reaction temperature is 80-85°C and the heating reaction time is 2-5h.

6. A method for preparing a graphene-modified solid-core flame-retardant conveyor belt for coal mines according to any one of claims 1 to 5, characterized in that: The following steps are involved: (a) mixing chloroprene rubber and hydrogenated nitrile rubber to obtain a rubber mixture, adding the mixture to an open mill for plastication to obtain a plasticated rubber; (b) adding graphene composite particles, magnesium hydroxide and dioctyl terephthalate to the plasticized rubber, stirring evenly, and then kneading to obtain a mixed rubber; (c) The polyester fabric is immersed in the mixed rubber, the polyester fabric is taken out, the excess mixed liquid on the polyester fabric is taken out by using a squeezing roller, and then the polyester fabric is dried and then vulcanized to obtain the product.

7. The method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines according to claim 6, characterized in that: In the step (a), the plasticizing temperature is controlled at 40-45°C.

8. The method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines according to claim 6, characterized in that: In the step (b), the mixing time is controlled within 10-20 minutes.

9. The method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines according to claim 6, characterized in that: In the step (c), the drying temperature is controlled at 70-75°C.

10. The method for preparing a graphene-modified whole-core flame-retardant conveyor belt for coal mines according to claim 6, characterized in that: In the step (c), the vulcanization temperature is controlled at 130-150° C., and the vulcanization time is 30-60 min.

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