Flame retardant rubber conveyor belt material and preparation method thereof

Abstract

The invention provides a flame-retardant rubber conveyor belt material and a preparation method thereof, comprising the following raw materials in parts by weight: 10-20 parts of hyperbranched polysiloxane containing phosphorus heterophenanthrene structure and vinyl, 10-15 parts of functional polymer, 40-50 parts of styrene-butadiene rubber, 3-5 parts of 2-acrylamide-2-methylpropane sulfonic acid, 1-3 parts of 2,4,6-trivinyl cycloboroxane, 0.8-1.2 parts of phosphorus pentoxide, 0.3-0.5 parts of polyphosphoric acid, 2-4 parts of vulcanizing agent, 20-30 parts of reinforcing agent, 3-5 parts of coupling agent, 1-3 parts of zinc stearate; the functional polymer comprises structural units introduced by the following monomers: benzoguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide. The material has good mechanical properties, excellent wear resistance and flame retardancy, and good heat aging resistance.

Description

Technical Field

[0001] The invention relates to the technical field of conveyor belt materials, and in particular to a flame retardant rubber conveyor belt material and a preparation method thereof. Background Art

[0002] Rubber conveyor belt is the main component of belt conveyor, mainly used in large-scale continuous transportation in coal mines, chemical industry, construction, transportation and other departments. It is an important means of modern industrial material and product transportation, and its usage is very large. The product quality, specifications, varieties and applications of rubber conveyor belts, to a certain extent, indicate the level of development of national economy and technology.

[0003] Rubber conveyor belts are mainly composed of skeleton materials and covering rubber layers. The covering rubber layer is a protective layer of the skeleton material. It prevents the skeleton material from being directly impacted, worn and corroded by the transported materials during operation, so as to increase the service life of the conveyor belt. Therefore, in order to meet the needs of transporting materials, the covering layer material needs to have good mechanical properties and wear resistance. For coal mining, chemical industry, electric power and other fields, it is necessary to transport coal, ore, powdered materials, etc., especially in the coal mining and chemical fields. The flame retardant properties of the conveyor belt are also indispensable, which can effectively improve production efficiency and safety. However, the rubber conveyor belt materials on the market have more or less technical defects such as insufficient mechanical properties, insufficient wear resistance and flame retardant properties, and heat aging resistance still needs to be further improved.

[0004] In order to solve the above problems, the Chinese invention patent with the authorization announcement number CN116102825B discloses a halogen-free flame-retardant rubber conveyor belt and its production method, wherein the halogen-free flame-retardant rubber conveyor belt includes a covering rubber and a skeleton layer, and the raw materials of the covering rubber include the following components by weight: 30-40 parts of hydrogenated nitrile rubber, 10-20 parts of methyl vinyl phenyl silicone rubber, 50-65 parts of EPDM rubber, 10-20 parts of polyethylene glycol, 20-40 parts of filler, 50-80 parts of microencapsulated aluminum hydroxide, 3-5 parts of cross-linking agent, 20-25 parts of adhesive, and 10-15 parts of antioxidant; the weight parts of the hydrogenated nitrile rubber, methyl vinyl phenyl silicone rubber, and EPDM rubber meet the following standards: hydrogenated nitrile rubber + methyl vinyl phenyl silicone rubber < EPDM rubber. Through the above technical solution, the problem of poor adhesion and wear resistance of EPDM rubber conveyor belt is solved. However, the heat aging resistance and mechanical properties of the material still need to be further improved.

[0005] It can be seen that the development of a flame-retardant rubber conveyor belt material with good mechanical properties, excellent wear resistance and flame retardancy, and good heat aging resistance and its preparation method meets market demand, has broad market value and application prospects, and is of great significance to promoting the development of the rubber conveyor belt field. Summary of the invention

[0006] In view of the above problems, the object of the present invention is to provide a flame-retardant rubber conveyor belt material with good mechanical properties, excellent wear resistance and flame retardancy, and good heat aging resistance, and a preparation method thereof.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a flame-retardant rubber conveyor belt material, comprising the following raw materials in parts by weight: 10-20 parts of hyperbranched polysiloxane containing phosphorus phenanthroline structure and vinyl, 10-15 parts of functional polymer, 40-50 parts of styrene-butadiene rubber, 3-5 parts of 2-acrylamido-2-methylpropane sulfonic acid, 1-3 parts of 2,4,6-trivinyl cycloboroxane, 0.8-1.2 parts of phosphorus pentoxide, 0.3-0.5 parts of polyphosphoric acid, 2-4 parts of vulcanizing agent, 20-30 parts of reinforcing agent, 3-5 parts of coupling agent, 1-3 parts of zinc stearate; the functional polymer comprises structural units introduced by the following monomers: benzoguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide.

[0008] Preferably, there is no special requirement for the source of the hyperbranched polysiloxane containing phosphaphenanthrene structure and vinyl group. In one embodiment of the present invention, the hyperbranched polysiloxane containing phosphaphenanthrene structure and vinyl group is prepared according to the method of Example 2 of Chinese invention patent with authorization announcement number CN102219906B.

[0009] Preferably, the preparation method of the functional polymer comprises the following steps: adding phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide and a catalyst to a high boiling point solvent, stirring and reacting at 75-90°C in an inert gas atmosphere for 4-6 hours, then heating to 95-98°C and continuing to stir and react for 6-13 hours, precipitating in water after the reaction, washing the precipitated polymer with ethanol for 3-6 times, and then rotary evaporating to remove the residual solvent to obtain a functional polymer.

[0010] Preferably, the molar ratio of the phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide, catalyst, and high boiling point solvent is 0.8:1:0.2:(0.8-1.2):(6-10).

[0011] Preferably, the catalyst is at least one of dibutyltin dilaurate and stannous octoate; the high boiling point solvent is dimethyl sulfoxide; and the inert gas is any one of nitrogen, helium, neon and argon.

[0012] Preferably, the styrene butadiene rubber is styrene butadiene rubber 1502 raw rubber.

[0013] Preferably, the vulcanizing agent is a mixture of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, diisopropylbenzene peroxide, and benzoyl peroxide in a mass ratio of 1:2:(0.8-1.2).

[0014] Preferably, the reinforcing agent is a mixture of white carbon black and nano-carbon fibers in a mass ratio of (3-5):1.

[0015] Preferably, the particle size of the white carbon black is 400-800 mesh; the average diameter of the nano-carbon fiber is 10-90 mesh, and the aspect ratio is (20-30):1; the coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570.

[0016] Another object of the present invention is to provide a method for preparing the flame-retardant rubber conveyor belt material, comprising the following steps: mixing the raw materials uniformly by weight, adding them to an open rubber mixer for mixing, and then vulcanizing and molding them on a flat vulcanizing press to obtain the flame-retardant rubber conveyor belt material.

[0017] Preferably, the vulcanization molding includes two-stage vulcanization, the first stage vulcanization temperature is 155-170°C, the pressure is 8-12MPa, and the vulcanization time is 5-8min; the second stage vulcanization temperature is 175-182°C, the pressure is 10-15MPa, and the vulcanization time is 1-2h.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The method for preparing the flame-retardant rubber conveyor belt material disclosed in the present invention only requires that the raw materials be mixed evenly, and then kneaded and vulcanized in sequence. The process is simple, the operation and control are convenient, the dependence on equipment is low, the energy consumption and capital investment are small, the preparation effect and the qualified rate of finished products are high, and the method is suitable for continuous large-scale production, and has a high value for promotion and application.

[0020] (2) The flame-retardant rubber conveyor belt material disclosed in the present invention comprises the following raw materials in parts by weight: 10-20 parts of hyperbranched polysiloxane containing phosphorus-containing phenanthroline structure and vinyl, 10-15 parts of functional polymer, 40-50 parts of styrene-butadiene rubber, 3-5 parts of 2-acrylamide-2-methylpropanesulfonic acid, 1-3 parts of 2,4,6-trivinyl cycloboroxane, 0.8-1.2 parts of phosphorus pentoxide, 0.3-0.5 parts of polyphosphoric acid, 2-4 parts of vulcanizing agent, 20-30 parts of reinforcing agent, 3-5 parts of coupling agent, 1-3 parts of zinc stearate; the functional polymer comprises the following monomer-introduced structural units: benzoguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide. Through the mutual cooperation between the raw materials, the conveyor belt material has good mechanical properties, excellent wear resistance and flame retardancy, good heat aging resistance, and long service life.

[0021] (3) The flame-retardant rubber conveyor belt material disclosed in the present invention comprises raw materials containing unsaturated olefinic bonds which can undergo copolymerization and curing reaction under the action of a vulcanizing agent, and raw materials containing benzene rings which can undergo chemical reaction with the sulfonic acid groups on 2-acrylamido-2-methylpropanesulfonic acid under the catalytic action of phosphorus pentoxide and polyphosphoric acid, so that a variety of different interpenetrating network structures are formed inside the conveyor belt material. The simultaneous existence of these network structures can effectively improve the internal density of the material and enhance the compatibility between the raw materials, thereby effectively improving the mechanical properties, wear resistance, flame retardancy and heat aging resistance.

[0022] (4) The flame-retardant rubber conveyor belt material disclosed in the present invention introduces phosphaphenanthrene, hyperbranched polysiloxane, benzoguanamine, phenylene sulfide, styrene-butadiene rubber, cycloboroxane, amide, and urea structures into the conveyor belt material through the reasonable selection of raw material types and dosage ratios. Under the multiple effects of electronic effect, steric effect, and conjugated effect, these structures make the mechanical properties, wear resistance, flame retardancy, and heat aging resistance of the manufactured conveyor belt material more excellent. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the product of the present invention is further described in detail below in conjunction with embodiments.

[0024] Example 1

[0025] A flame-retardant rubber conveyor belt material comprises the following raw materials in parts by weight: 10 parts of hyperbranched polysiloxane containing phosphorus-containing phenanthroline structure and vinyl group, 10 parts of functional polymer, 40 parts of styrene-butadiene rubber, 3 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1 part of 2,4,6-trivinyl cycloboroxane, 0.8 parts of phosphorus pentoxide, 0.3 parts of polyphosphoric acid, 2 parts of vulcanizing agent, 20 parts of reinforcing agent, 3 parts of coupling agent and 1 part of zinc stearate; the functional polymer comprises structural units introduced by the following monomers: benzoguanamine, diisocyanate polyethylene glycol and 4,4'-diaminodiphenyl sulfide.

[0026] The hyperbranched polysiloxane containing a phosphaphenanthrene structure and a vinyl group is prepared according to the method of Example 2 of the Chinese invention patent with the authorization announcement number CN102219906B.

[0027] The preparation method of the functional polymer comprises the following steps: adding benzoguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide, and a catalyst to a high boiling point solvent, stirring and reacting at 75°C for 4 hours in an inert gas atmosphere, then heating to 95°C and continuing stirring and reacting for 6 hours, precipitating in water after the reaction, washing the precipitated polymer with ethanol for 3 times, and then rotary evaporating to remove the residual solvent to obtain a functional polymer; the molar ratio of benzoguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide, catalyst, and high boiling point solvent is 0.8:1:0.2:0.8:6; the catalyst is dibutyltin dilaurate; the high boiling point solvent is dimethyl sulfoxide; and the inert gas is nitrogen. The M of the functional polymer is measured by GPC test. n =14792 g / mol, M W / M n =1.413; through elemental analysis and weight change calculation, the molar ratio of the structural units introduced by phenyl guanamine, diisocyanate polyethylene glycol, and 4,4'-diaminodiphenyl sulfide in the functional polymer is the same as the theoretical value.

[0028] The styrene-butadiene rubber is styrene-butadiene rubber 1502 raw rubber; the vulcanizing agent is a mixture of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, diisopropylbenzene peroxide, and benzoyl peroxide in a mass ratio of 1:2:0.8; the reinforcing agent is a mixture of white carbon black and nano-carbon fibers in a mass ratio of 5:1; the particle size of the white carbon black is 400 mesh; the average diameter of the nano-carbon fibers is 10 mesh, and the aspect ratio is 20:1; the coupling agent is silane coupling agent KH550.

[0029] A method for preparing the flame-retardant rubber conveyor belt material comprises the following steps: uniformly mixing the raw materials by weight, adding the raw materials into an open rubber mixer for mixing, and then vulcanizing and molding on a flat vulcanizing press to obtain the flame-retardant rubber conveyor belt material; the vulcanization molding comprises two-stage vulcanization, wherein the first stage vulcanization temperature is 155°C, the pressure is 8MPa, and the vulcanization time is 5min; the second stage vulcanization temperature is 175°C, the pressure is 10MPa, and the vulcanization time is 1h.

[0030] Example 2

[0031] A flame-retardant rubber conveyor belt material is made of the following raw materials in parts by weight: 13 parts of hyperbranched polysiloxane containing phosphorus-containing phenanthroline structure and vinyl group, 12 parts of functional polymer, 43 parts of styrene-butadiene rubber, 3.5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1.5 parts of 2,4,6-trivinyl cycloboroxine, 0.9 parts of phosphorus pentoxide, 0.35 parts of polyphosphoric acid, 2.5 parts of vulcanizing agent, 23 parts of reinforcing agent, 3.5 parts of coupling agent and 1.5 parts of zinc stearate; the functional polymer comprises structural units introduced by the following monomers: benzoguanamine, diisocyanate polyethylene glycol and 4,4'-diaminodiphenyl sulfide.

[0032] The hyperbranched polysiloxane containing a phosphaphenanthrene structure and a vinyl group is prepared according to the method of Example 2 of the Chinese invention patent with the authorization announcement number CN102219906B.

[0033] The preparation method of the functional polymer comprises the following steps: adding phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide and a catalyst to a high boiling point solvent, stirring and reacting at 80°C for 4.5 hours in an inert gas atmosphere, then heating to 96°C and continuing stirring and reacting for 7 hours, precipitating the polymer in water after the reaction is completed, washing the precipitated polymer with ethanol for 4 times, and then rotary evaporating to remove the residual solvent to obtain the functional polymer; the molar ratio of the phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide, catalyst and high boiling point solvent is 0.8:1:0.2:0.9:7; the catalyst is stannous octoate; the high boiling point solvent is dimethyl sulfoxide; and the inert gas is helium.

[0034] The styrene-butadiene rubber is styrene-butadiene rubber 1502 raw rubber; the vulcanizing agent is a mixture of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, diisopropylbenzene peroxide, and benzoyl peroxide in a mass ratio of 1:2:0.9; the reinforcing agent is a mixture of white carbon black and nano-carbon fibers in a mass ratio of 4.5:1; the particle size of the white carbon black is 500 mesh; the average diameter of the nano-carbon fibers is 20 mesh, and the aspect ratio is 22:1; the coupling agent is a silane coupling agent KH560.

[0035] A method for preparing the flame-retardant rubber conveyor belt material comprises the following steps: after uniformly mixing the raw materials by weight, adding them into an open rubber mixer for mixing, and then vulcanizing and molding them on a flat vulcanizing press to obtain the flame-retardant rubber conveyor belt material; the vulcanization molding comprises two-stage vulcanization, the first stage vulcanization temperature is 160°C, the pressure is 9MPa, and the vulcanization time is 6min; the second stage vulcanization temperature is 177°C, the pressure is 12MPa, and the vulcanization time is 1.2h.

[0036] Example 3

[0037] A flame-retardant rubber conveyor belt material comprises the following raw materials in parts by weight: 15 parts of hyperbranched polysiloxane containing phosphorus-containing phenanthroline structure and vinyl group, 13 parts of functional polymer, 45 parts of styrene-butadiene rubber, 4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 2 parts of 2,4,6-trivinyl cycloboroxane, 1 part of phosphorus pentoxide, 0.4 parts of polyphosphoric acid, 3 parts of vulcanizing agent, 25 parts of reinforcing agent, 4 parts of coupling agent and 2 parts of zinc stearate; the functional polymer comprises structural units introduced by the following monomers: benzoguanamine, diisocyanate polyethylene glycol and 4,4'-diaminodiphenyl sulfide.

[0038] The hyperbranched polysiloxane containing a phosphaphenanthrene structure and a vinyl group is prepared according to the method of Example 2 of the Chinese invention patent with the authorization announcement number CN102219906B.

[0039] The preparation method of the functional polymer comprises the following steps: adding phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide and a catalyst to a high boiling point solvent, stirring and reacting for 5 hours at 83°C in an inert gas atmosphere, then heating to 97°C and continuing stirring and reacting for 9 hours, precipitating the polymer in water after the reaction is completed, washing the precipitated polymer with ethanol for 5 times, and then removing the residual solvent by rotary evaporation to obtain the functional polymer; the molar ratio of the phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide, catalyst and high boiling point solvent is 0.8:1:0.2:1:8; the catalyst is dibutyltin dilaurate; the high boiling point solvent is dimethyl sulfoxide; and the inert gas is neon.

[0040] The styrene-butadiene rubber is styrene-butadiene rubber 1502 raw rubber; the vulcanizing agent is a mixture of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, diisopropylbenzene peroxide, and benzoyl peroxide in a mass ratio of 1:2:1; the reinforcing agent is a mixture of white carbon black and nano-carbon fibers in a mass ratio of 4:1; the particle size of the white carbon black is 600 mesh; the average diameter of the nano-carbon fibers is 50 mesh, and the aspect ratio is 25:1; the coupling agent is a silane coupling agent KH570.

[0041] A method for preparing the flame-retardant rubber conveyor belt material comprises the following steps: uniformly mixing the raw materials by weight, adding the raw materials into an open rubber mixer for mixing, and then vulcanizing and molding on a flat vulcanizing press to obtain the flame-retardant rubber conveyor belt material; the vulcanization molding comprises two-stage vulcanization, wherein the first stage vulcanization temperature is 163°C, the pressure is 10MPa, and the vulcanization time is 6.5min; the second stage vulcanization temperature is 179°C, the pressure is 13MPa, and the vulcanization time is 1.5h.

[0042] Example 4

[0043] A flame-retardant rubber conveyor belt material comprises the following raw materials in parts by weight: 18 parts of hyperbranched polysiloxane containing phosphorus-containing phenanthroline structure and vinyl group, 14 parts of functional polymer, 48 parts of styrene-butadiene rubber, 4.5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 2.5 parts of 2,4,6-trivinyl cycloboroxane, 1.1 parts of phosphorus pentoxide, 0.45 parts of polyphosphoric acid, 3.5 parts of vulcanizing agent, 28 parts of reinforcing agent, 4.5 parts of coupling agent and 2.5 parts of zinc stearate; the functional polymer comprises structural units introduced by the following monomers: benzoguanamine, diisocyanate polyethylene glycol and 4,4'-diaminodiphenyl sulfide.

[0044] The hyperbranched polysiloxane containing a phosphaphenanthrene structure and a vinyl group is prepared according to the method of Example 2 of the Chinese invention patent with the authorization announcement number CN102219906B.

[0045] The preparation method of the functional polymer comprises the following steps: adding phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide and a catalyst to a high boiling point solvent, stirring and reacting for 5.5 hours at 88°C in an inert gas atmosphere, then heating to 97°C and continuing stirring and reacting for 12 hours, precipitating the polymer in water after the reaction is completed, washing the precipitated polymer with ethanol for 5 times, and then removing the residual solvent by rotary evaporation to obtain the functional polymer; the molar ratio of the phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide, catalyst and high boiling point solvent is 0.8:1:0.2:1.1:9.5; the catalyst is a mixture of dibutyltin dilaurate and stannous octoate in a mass ratio of 3:5; the high boiling point solvent is dimethyl sulfoxide; and the inert gas is argon.

[0046] The styrene-butadiene rubber is styrene-butadiene rubber 1502 raw rubber; the vulcanizing agent is a mixture of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, diisopropylbenzene peroxide, and benzoyl peroxide in a mass ratio of 1:2:1.1; the reinforcing agent is a mixture of white carbon black and nano-carbon fibers in a mass ratio of 3.5:1; the particle size of the white carbon black is 750 mesh; the average diameter of the nano-carbon fibers is 80 mesh, and the aspect ratio is 28:1; the coupling agent is a mixture of silane coupling agent KH550, silane coupling agent KH560, and silane coupling agent KH570 in a mass ratio of 1:2:3.

[0047] A method for preparing the flame-retardant rubber conveyor belt material comprises the following steps: uniformly mixing the raw materials by weight, adding the raw materials into an open rubber mixer for mixing, and then vulcanizing and molding on a flat vulcanizing press to obtain the flame-retardant rubber conveyor belt material; the vulcanization molding comprises two-stage vulcanization, wherein the first stage vulcanization temperature is 168°C, the pressure is 11MPa, and the vulcanization time is 7.5min; the second stage vulcanization temperature is 180°C, the pressure is 14MPa, and the vulcanization time is 1.8h.

[0048] Example 5

[0049] A flame-retardant rubber conveyor belt material is made of the following raw materials in parts by weight: 20 parts of hyperbranched polysiloxane containing phosphorus phenanthroline structure and vinyl group, 15 parts of functional polymer, 50 parts of styrene-butadiene rubber, 5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 3 parts of 2,4,6-trivinyl cycloboroxane, 1.2 parts of phosphorus pentoxide, 0.5 parts of polyphosphoric acid, 4 parts of vulcanizing agent, 30 parts of reinforcing agent, 5 parts of coupling agent and 3 parts of zinc stearate; the functional polymer comprises structural units introduced by the following monomers: benzoguanamine, diisocyanate polyethylene glycol and 4,4'-diaminodiphenyl sulfide.

[0050] The hyperbranched polysiloxane containing a phosphaphenanthrene structure and a vinyl group is prepared according to the method of Example 2 of the Chinese invention patent with the authorization announcement number CN102219906B.

[0051] The preparation method of the functional polymer comprises the following steps: adding phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide and a catalyst to a high boiling point solvent, stirring and reacting for 6 hours at 90°C in an inert gas atmosphere, then heating to 98°C and continuing stirring and reacting for 13 hours, precipitating the polymer in water after the reaction is completed, washing the precipitated polymer with ethanol for 6 times, and then removing the residual solvent by rotary evaporation to obtain the functional polymer; the molar ratio of the phenylguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide, catalyst and high boiling point solvent is 0.8:1:0.2:1.2:10; the catalyst is dibutyltin dilaurate; the high boiling point solvent is dimethyl sulfoxide; and the inert gas is nitrogen.

[0052] The styrene-butadiene rubber is styrene-butadiene rubber 1502 raw rubber; the vulcanizing agent is a mixture of 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, diisopropylbenzene peroxide, and benzoyl peroxide in a mass ratio of 1:2:1.2; the reinforcing agent is a mixture of white carbon black and nano-carbon fibers in a mass ratio of 3:1; the particle size of the white carbon black is 800 mesh; the average diameter of the nano-carbon fibers is 90 mesh, and the aspect ratio is 30:1; the coupling agent is silane coupling agent KH550.

[0053] A method for preparing the flame-retardant rubber conveyor belt material comprises the following steps: after uniformly mixing the raw materials by weight, adding them into an open rubber mixer for mixing, and then vulcanizing and molding them on a flat vulcanizing press to obtain the flame-retardant rubber conveyor belt material; the vulcanization molding comprises two-stage vulcanization, the first stage vulcanization temperature is 170°C, the pressure is 12MPa, and the vulcanization time is 8min; the second stage vulcanization temperature is 182°C, the pressure is 15MPa, and the vulcanization time is 2h.

[0054] Comparative Example 1

[0055] A flame retardant rubber conveyor belt material, which is basically the same as Example 1, except that no functional copolymer is added.

[0056] Comparative Example 2

[0057] A flame retardant rubber conveyor belt material is substantially the same as Example 1, except that 2-acrylamide-2-methylpropane sulfonic acid and 2,4,6-trivinyl cycloboroxine are not added.

[0058] In order to further illustrate the unexpected positive technical effects achieved by the products of each embodiment of the present invention, the flame-retardant rubber conveyor belt materials prepared in each example were subjected to relevant performance tests. The test results are shown in Table 1. The test methods are as follows: the limiting oxygen index is carried out in accordance with GB / T 10707-2008; the tensile strength is carried out in accordance with GB / T 528-2009; the aging resistance is tested in accordance with GB / T3512-2014, the aging temperature is 125°C, the aging time is 7 days, and the retention rate of tensile strength is used as the measure. The relative volume wear is tested in accordance with the standard GB / T9867-2008 "Determination of wear resistance of vulcanized rubber or thermoplastic rubber (rotating roller wear machine method)".

[0059] Table 1

[0060] project Limiting oxygen index Relative volume wear Tensile Strength Aging resistance unit ％ <![CDATA[mm 3 ]]> MPa ％ Example 1 41.5 35 30.5 99.14 Example 2 41.8 30 33.2 99.37 Example 3 42.0 28 35.0 99.57 Example 4 42.4 25 37.3 99.70 Example 5 42.5 23 39.0 99.95 Comparative Example 1 35.7 50 27.7 97.78 Comparative Example 2 35.2 63 24.2 96.93

[0061] It can be seen from Table 1 that the flame retardant rubber conveyor belt material disclosed in the embodiment of the present invention has better flame retardancy, wear resistance, mechanical properties and aging resistance than the comparative product.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as described above. However, any technician familiar with the profession can make some changes, modifications and evolutions of the technical content disclosed above without departing from the scope of the technical solution of the present invention, which are all equivalent embodiments of the present invention. At the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A flame retardant rubber conveyor belt material, characterized in that: The invention comprises the following raw materials in parts by weight: 10-20 parts of hyperbranched polysiloxane containing phosphorus-containing phenanthroline structure and vinyl group, 10-15 parts of functional polymer, 40-50 parts of styrene-butadiene rubber, 3-5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1-3 parts of 2,4,6-trivinyl cycloboroxane, 0.8-1.2 parts of phosphorus pentoxide, 0.3-0.5 parts of polyphosphoric acid, 2-4 parts of vulcanizing agent, 20-30 parts of reinforcing agent, 3-5 parts of coupling agent and 1-3 parts of zinc stearate; the functional polymer comprises structural units introduced by the following monomers: phenyl guanamine, diisocyanate polyethylene glycol and 4,4'-diaminodiphenyl sulfide; The preparation method of the functional polymer comprises the following steps: adding benzoguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide and a catalyst to a high boiling point solvent, stirring and reacting for 4-6 hours at 75-90° C. in an inert gas atmosphere, then heating to 95-98° C. and continuing stirring and reacting for 6-13 hours, precipitating the polymer in water after the reaction is completed, washing the precipitated polymer with ethanol for 3-6 times, and then rotary evaporating to remove the residual solvent to obtain the functional polymer; the molar ratio of the benzoguanamine, diisocyanate polyethylene glycol, 4,4'-diaminodiphenyl sulfide, the catalyst and the high boiling point solvent is 0.8:1:0.2:(0.8-1.2):(6-10).

2. The flame retardant rubber conveyor belt material according to claim 1, characterized in that: The catalyst is at least one of dibutyltin dilaurate and stannous octoate; the high boiling point solvent is dimethyl sulfoxide; and the inert gas is any one of nitrogen, helium, neon and argon.

3. The flame retardant rubber conveyor belt material according to claim 1, characterized in that: The styrene-butadiene rubber is styrene-butadiene rubber 1502 raw rubber; the vulcanizing agent is prepared by mixing 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane, diisopropylbenzene peroxide and benzoyl peroxide in a mass ratio of 1:2:(0.8-1.2).

4. The flame retardant rubber conveyor belt material according to claim 1, characterized in that: The reinforcing agent is a mixture of white carbon black and nano carbon fibers in a mass ratio of (3-5):1; the particle size of the white carbon black is 400-800 meshes; the average diameter of the nano carbon fibers is 10-90 meshes, and the aspect ratio is (20-30):

1.

5. The flame retardant rubber conveyor belt material according to claim 1, characterized in that: The coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570.

6. A method for preparing the flame-retardant rubber conveyor belt material according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: mixing the raw materials uniformly according to weight, adding the raw materials into an open rubber mixer for mixing, and then vulcanizing and molding the raw materials on a flat vulcanizing machine to obtain a flame-retardant rubber conveyor belt material.

7. The method for preparing the flame retardant rubber conveyor belt material according to claim 6, characterized in that: The vulcanization molding includes two-stage vulcanization, the first stage vulcanization temperature is 155-170° C., the pressure is 8-12 MPa, and the vulcanization time is 5-8 minutes; the second stage vulcanization temperature is 175-182° C., the pressure is 10-15 MPa, and the vulcanization time is 1-2 hours.