Flame-retardant rubber material for synchronous belt of rail transit platform screen door, preparation method and application of flame-retardant rubber material and synchronous belt of rail transit platform screen door

Abstract

The invention provides a flame-retardant rubber material for a rail transit platform screen door synchronous belt, a preparation method and application of the flame-retardant rubber material and the rail transit platform screen door synchronous belt, and relates to the technical field of synchronous belts. The flame-retardant rubber material provided by the invention comprises the following components in parts by weight: 90-100 parts of chloroprene rubber, 0.1-10 parts of butadiene rubber, 3.8-6.8 parts of a scorch retarder, 46-61 parts of a reinforcing agent, 0.2-0.5 part of an accelerant, 3-5 parts of an anti-aging agent, 1-3 parts of a dispersing agent, 2-8 parts of a plasticizer, 4-6 parts of a cross-linking agent, 2-3 parts of a tackifier and 11-15 parts of a flame retardant, the flame retardant is a compound flame retardant comprising chlorinated paraffin and a phosphorus-nitrogen compound. By optimizing the proportion of the components in the rubber material, the rubber material has good flame retardance, excellent mechanical property and good stability, and the problem that the mechanical property of the synchronous belt is reduced after a flame retardant is added in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of synchronous belts, and in particular to a flame-retardant rubber material for a synchronous belt of a rail transit shield door, a preparation method and application thereof, and a synchronous belt of a rail transit shield door. Background Art

[0002] In the field of rail transportation, the commonly used rubber synchronous belt mainly uses chloroprene rubber (CR) as the material. This synchronous belt realizes power transmission through the precise meshing of belt teeth and wheel grooves, ensuring the accuracy of the transmission ratio, without sliding deviation, and can provide a stable speed ratio. In addition, it also has the advantages of smooth operation, vibration absorption, low noise, and high transmission efficiency.

[0003] Synchronous belts use high-performance fibers such as aramid as reinforcement materials, and are wrapped with rubber to form an annular belt body. The inner surface of the belt is designed to be toothed and meshes with the corresponding toothed pulley. With the continuous progress of my country's industry, especially in the field of rail transportation, higher requirements are placed on the flame retardant properties and quality stability of rubber products. This is to ensure that when a fire occurs, rubber products will not aggravate the spread of the fire, and can effectively reduce the emission of harmful gases and smoke, thereby better protecting the lives of passengers.

[0004] In order to improve the flame retardant properties of synchronous belts for rail transit, flame retardants are usually added to the rubber material of the synchronous belts. However, in the prior art, adding flame retardants will reduce the mechanical properties of the synchronous belts. Therefore, how to make synchronous belts for rail transit have good flame retardancy, excellent mechanical properties and good stability is an urgent problem to be solved. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a flame retardant rubber material for a rail transit shield door synchronous belt, a preparation method and application thereof, and a rail transit shield door synchronous belt. Through a reasonable component ratio composition, the prepared rail transit shield door synchronous belt has good flame retardancy, excellent mechanical properties and good stability.

[0006] The specific technical scheme of the present invention is: In a first aspect, the present invention provides a flame retardant rubber material for a synchronous belt of a rail transit shield door, wherein the flame retardant rubber material comprises the following components in parts by weight: 90-100 parts of chloroprene rubber, 0.1-10 parts of butadiene rubber, 3.8-6.8 parts of a scorch retarder, 46-61 parts of a reinforcing agent, 0.2-0.5 parts of an accelerator, 3-5 parts of an antioxidant, 1-3 parts of a dispersant, 2-8 parts of a plasticizer, 4-6 parts of a cross-linking agent, 2-3 parts of a tackifier, and 11-15 parts of a flame retardant, wherein the flame retardant is a composite flame retardant comprising chlorinated paraffin and a phosphorus-nitrogen compound.

[0007] The invention optimizes the ratio of each component in the flame retardant rubber material and adopts a composite flame retardant including chlorinated paraffin and phosphorus-nitrogen compounds. The chlorinated paraffin and phosphorus-nitrogen compounds can play a role in the gas phase and the condensed phase, dilute oxygen by releasing HCl, phosphorus-containing molecules and non-flammable gases, and inhibit the free radical chain reaction in the combustion process; the decomposition products thereof can further promote the dehydration and carbonization of the polymer surface at high temperature to form a stable carbon layer, which can isolate the fire source and prevent the heat and oxygen transfer, thereby playing a flame retardant role, and can also prevent the polymer from further pyrolysis, thereby significantly improving the flame retardant performance and stability of the rubber material; in order to avoid the reduction of the mechanical properties of the rubber material caused by the addition of the flame retardant, the invention further adopts a high proportion of chloroprene rubber and a low proportion of a crosslinking agent and a tackifier to cooperate with each other to improve the mechanical properties of the rubber material, such as elasticity, tensile strength, tooth shear strength, etc., and the components in the rubber material cooperate with each other so that the prepared synchronous belt has good flame retardancy, excellent mechanical properties and good stability.

[0008] In a possible implementation, the mass ratio of the chlorinated paraffin and the phosphorus-nitrogen compound in the compound flame retardant is 1:0.83. By controlling the ratio of the chlorinated paraffin and the phosphorus-nitrogen compound in the compound flame retardant and combining them with other components of the flame retardant rubber material, the flame retardant rubber material can have better flame retardant properties and mechanical properties.

[0009] In a possible implementation, the phosphorus-nitrogen compound includes 1,3,5-triazine-2,4,6-triamine phosphate. The combination of 1,3,5-triazine-2,4,6-triamine phosphate and chlorinated paraffin can make the flame-retardant rubber material have the best flame retardant performance and higher tensile strength.

[0010] In a possible embodiment, the scorch retarder includes one or more of magnesium oxide and layered double metal hydroxide. The scorch retarder can extend the scorch time and widen the scorch temperature range, and can also be combined with a cross-linking agent to control the cross-linking time to be appropriate, which is convenient for processing and operation, and can save costs and energy consumption.

[0011] In a possible implementation, the reinforcing agent includes one or more of high wear-resistant carbon black N330 and semi-reinforcing carbon black N550. The use of the above reinforcing agent is conducive to improving the tooth shear strength, cloth adhesion and T pull-out of the synchronous belt made of the rubber material, wherein T pull-out refers to the bonding strength between the reactive core layer and the skeleton material of the synchronous belt.

[0012] In a possible embodiment, the accelerator includes one or more of 3-methyl-2-thiazolethione and 2,2'-dithiodibenzothiazole. The use of the above accelerator is more conducive to shortening the vulcanization time and reducing the vulcanization temperature.

[0013] In a possible implementation, the antioxidant includes 4,4'-diaminodiphenyl ether. The use of the antioxidant can further increase the service life of the flame retardant rubber material.

[0014] In a possible implementation, the dispersant includes a complex of a surfactant and a fatty acid soap. The surfactant and the fatty acid soap are used as dispersants to improve the uniformity of the rubber material and the consistency of product quality in combination with other ingredients.

[0015] In a possible implementation, the plasticizer includes dioctyl sebacate. Dioctyl sebacate has excellent low-temperature resistance, and using dioctyl sebacate as a plasticizer can improve the low-temperature resistance of the rubber material.

[0016] In a possible implementation, the cross-linking agent includes zinc oxide. Using zinc oxide as a cross-linking agent can make the flame retardant rubber material have higher strength and elasticity.

[0017] In a possible implementation, the tackifier includes hexamethylol melamine. Hexamethylol melamine is used as a tackifier to form a hydrogen bond network structure with chloroprene rubber and butadiene rubber, so that the flame retardant rubber material has better viscosity.

[0018] In a second aspect, the present invention provides a method for preparing the flame retardant rubber material, comprising the following steps: S1, chloroprene rubber and cis-1,1-butadiene rubber are respectively subjected to a first mastication on an open mill, the masticated chloroprene rubber and cis-1,1-butadiene rubber are mixed, and a second mastication is performed to obtain a mixed masticated rubber; the mass fractions of the chloroprene rubber and cis-1,1-butadiene rubber are 90-100 parts and 0.1-10 parts, respectively; S2, adding the mixed plasticized rubber obtained in step S1 into an internal mixer, adding a dispersant, a plasticizer, a scorch retarder and a flame retardant for primary mixing, then adding a reinforcing agent for secondary mixing and then draining, and then rapidly cooling with water and then heat-insulating to obtain a masterbatch, wherein the mass fractions of the dispersant, the plasticizer, the scorch retarder, the reinforcing agent and the flame retardant are 1-3 parts, 2-8 parts, 3.8-6.8 parts, 46-61 parts and 11-15 parts respectively; S3, adding the first stage of masterbatch after heat preservation in step S2 into the internal mixer again, and then adding antioxidant, accelerator, crosslinking agent and tackifier to mix, after mixing, the glue is discharged, and then the second stage of masterbatch is obtained after rapid water cooling and heat preservation, wherein the weight proportions of the antioxidant, accelerator, crosslinking agent and tackifier are 3-5 parts, 0.2-0.5 parts, 4-6 parts and 2-3 parts respectively; S4, adding the second-stage masterbatch obtained in step S3 into an extruder to extrude an extruded film, and then standing the extruded film at room temperature for 24-38 hours and vulcanizing the extruded film to obtain a rubber material for a synchronous belt of a rail transit shield door.

[0019] In a possible implementation manner, the roller spacing of the mixing mill in step S1 is 1.5-2 mm.

[0020] In a possible implementation manner, the primary mastication time of the chloroprene rubber in step S1 is 180-210 s, and the primary mastication time of the butadiene rubber is 30-60 s.

[0021] In a possible implementation manner, the time of the secondary mastication in step S1 is 120-150 s.

[0022] In a possible implementation, in step S2, during the primary mixing, the rotor speed of the internal mixer is 27-30 r / min, and the mixing time is 170-190 s.

[0023] In a possible implementation, in step S2, during the secondary mixing, the rotor speed of the internal mixer is 27-30 r / min, and the mixing time is 290-310 s.

[0024] In a possible implementation manner, the debinding temperature in step S2 is 90-105°C.

[0025] In a possible implementation, in step S3, during the mixing, the rotation speed of the internal mixer is 23-26 r / min, and the mixing time is 90-120 s.

[0026] In a possible implementation manner, the debinding temperature in step S3 is 70-85°C.

[0027] In a possible implementation manner, the temperature of the cooling water for the rapid water cooling in step S2 and step S3 is 20-30°C.

[0028] In a possible implementation manner, the insulation time in step S2 and step S3 is 16-24 h and the insulation temperature is 20-30° C.

[0029] In a possible implementation manner, the extrusion speed in step S4 is 3.7-5.3 r / min.

[0030] In a possible implementation manner, the thickness of the extruded film in step S4 is 0.65-0.75 mm.

[0031] In a possible implementation manner, the vulcanization temperature in step S4 is 160° C., the pressure is 5-10 Mpa, and the time is 23 min.

[0032] In a third aspect, the present invention provides a rail transit screen door synchronous belt, which is made of the flame-retardant rubber material.

[0033] In a fourth aspect, the present invention provides application of the flame retardant rubber material in the field of rail transportation.

[0034] Based on the common knowledge in this field, the above-mentioned implementation modes can be combined arbitrarily.

[0035] The reagents and raw materials used in the present invention are commercially available.

[0036] The positive and progressive effects of the present invention are: Compared with the prior art, the rubber material for rail transit screen door synchronous belt and the preparation method thereof provided by the present invention significantly improve the flame retardant properties of the rubber material. The flame retardant properties of the rubber material can reach V-0 flame retardant grade. At the same time, the rubber material also has excellent mechanical properties. The tensile stress of the synchronous belt prepared with the rubber material can reach more than 1200 N / mm, which is significantly higher than the national standard requirement of 300 N / mm. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below. It should be noted that the following embodiments are only used to illustrate the implementation method and typical parameters of the present invention, and are not used to limit the parameter range described in the present invention. Reasonable changes derived therefrom are still within the scope of protection of the claims of the present invention.

[0038] It should be noted that the endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this article.

[0039] Unless otherwise defined, all terms, symbols and other scientific terms used herein are intended to have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. In some cases, terms with conventionally understood meanings are defined herein for the purpose of clarification or ease of reference, and such definitions herein should not be construed as indicating significant differences from conventional understandings in the art. The technical methods described or cited herein are generally well understood by those skilled in the art and are adopted by conventional methods. Unless otherwise stated, the use of commercially available kits, reagents and instruments is carried out in accordance with the protocols and parameters given by the manufacturer.

[0040] Example 1

[0041] The present embodiment provides a rubber material for a synchronous belt of a rail transit shield door, comprising the following components in parts by weight: 93 parts of chloroprene rubber, 6 parts of butadiene rubber, 2 parts of a dispersant, 5 parts of a plasticizer, 5 parts of a scorch retarder, 52 parts of a reinforcing agent, 0.3 parts of an accelerator, 4 parts of an antioxidant, 5 parts of a cross-linking agent, 2.5 parts of a tackifier, and 13 parts of a flame retardant, wherein the flame retardant is chlorinated paraffin and 1,3,5-triazine-2,4,6-triamine phosphate, and the chlorinated paraffin and 1,3,5 The mass ratio of triazine-2,4,6-triaminophosphate is 1:0.83, the dispersant is a complex of surfactant and fatty acid soap, the plasticizer is dioctyl sebacic acid, the scorch retarder is magnesium oxide and layered double metal hydroxide, the reinforcing agent is high wear-resistant carbon black N330 and semi-reinforcing carbon black N550, the accelerator is 3-methyl-2-thiazolethione, the antioxidant is 4,4´-diaminodiphenyl ether, the cross-linking agent is zinc oxide, and the tackifier is hexamethylolmelamine hexamethylene ether.

[0042] It is prepared by the following method: S1, 93 parts of chloroprene rubber were masticated for 190 s on an open mill with a roll gap of 2 mm, and 6 parts of cis-1,4-dibutyl rubber were masticated for 45 s on an open mill with a roll gap of 2 mm, and the masticated chloroprene rubber and cis-1,4-dibutyl rubber were mixed and masticated for a second time for 135 s to obtain a mixed masticated rubber; S2, the mixed plasticized rubber obtained in step S1 is added to an internal mixer, the rotor speed of the internal mixer is set to 28 r / min, and then 2 parts of dispersant, 5 parts of plasticizer, 5 parts of scorch retarder and 13 parts of flame retardant are added for primary mixing for 180 s, and then the rotor speed of the internal mixer is set to 30 r / min, and 52 parts of reinforcing agent are added for secondary mixing for 300 s, and then the glue is discharged at a temperature of 100°C, and then cooled with cold water at 25°C, and kept at 25°C for 20 h to obtain a masterbatch; S3, the first stage masterbatch obtained in step S2 is added to the internal mixer again, the rotor speed of the internal mixer is set to 24 r / min, and then 4 parts of antioxidant, 0.3 parts of accelerator, 5 parts of cross-linking agent and 2.5 parts of tackifier are added and mixed for 105s. After the mixing is completed, the glue is discharged at 80°C, and then it is quickly cooled by cooling water at 25°C, and then kept at 25°C for 20 hours to obtain the second stage masterbatch; S4. Add the second-stage masterbatch obtained in step S3 into an extruder to extrude an extruded film, the extrusion speed of the extruder is 4.5 r / min, the thickness of the extruded film is 0.7 mm, and then the extruded film is vulcanized after being left at room temperature for 30 hours, the vulcanization temperature is 160°C, the pressure is 8 MPa, and the time is 20 min, to obtain a flame retardant rubber material for a synchronous belt of a rail transit shield door.

[0043] The flame retardant grade of the flame retardant rubber material prepared in this embodiment is V-0, and the tensile strength of the flame retardant rubber material is 16.52 Mpa, which is higher than the enterprise standard of 14 Mpa; the rubber material prepared in this embodiment is used to make a synchronous belt for rail transit shield door, and the belt shear of the synchronous belt is measured to be 107 N / m, which is much higher than the national standard of 60 N / m, the T extraction of the synchronous belt is 1296 N, which is much higher than the national standard of 700 N, and the cloth stripping of the synchronous belt is 21 N / m, which is much higher than the national standard of 10 N / m.

[0044] Example 2

[0045] The present embodiment provides a rubber material for a synchronous belt of a rail transit shield door, comprising the following components in parts by weight: 90 parts of chloroprene rubber, 1 part of butadiene rubber, 1 part of dispersant, 2 parts of plasticizer, 4 parts of anti-scorching agent, 46 parts of reinforcing agent, 0.2 parts of accelerator, 3 parts of antioxidant, 4 parts of cross-linking agent, 2 parts of tackifier, and 11 parts of flame retardant, wherein the flame retardant is chlorinated paraffin and 1,3,5-triazine-2,4,6-triamine phosphate, and the mass ratio of chlorinated paraffin to 1,3,5-triazine-2,4,6-triamine phosphate is 1:0.8, the dispersant is a complex of a surfactant and a fatty acid soap, the plasticizer is dioctyl sebaceous acid, the anti-scorching agent is magnesium oxide, the reinforcing agent is high wear-resistant carbon black N330, and the accelerator is 2,2 '-Dibenzothiazole disulfide, the antioxidant is 4,4'-diaminodiphenyl ether, the cross-linking agent is zinc oxide, and the viscosity increasing agent is hexamethylol melamine hexamethylene ether.

[0046] It is prepared by the following method: S1, 90 parts of chloroprene rubber were masticated for 180 s on an open mill with a roll gap of 2 mm, and 1 part of cis-1,4-butadiene rubber was masticated for 60 s on an open mill with a roll gap of 1.5 mm, and the masticated chloroprene rubber and cis-1,4-butadiene rubber were mixed and masticated for a second time for 150 s to obtain a mixed masticated rubber; S2, the mixed plasticized rubber obtained in step S1 is added to an internal mixer, the rotor speed of the internal mixer is set to 27 r / min, and then 1 part of dispersant, 2 parts of plasticizer, 4 parts of scorch retarder and 11 parts of flame retardant are added for primary mixing for 190 s, and then the rotor speed of the internal mixer is set to 27 r / min, 46 parts of reinforcing agent are added for secondary mixing for 310 s, and then the glue is discharged at a temperature of 90°C, and then cooled with cold water at 20°C, and kept at 20°C for 24 h to obtain a masterbatch; S3, the first-stage masterbatch obtained in step S2 is added to the internal mixer again, the rotor speed of the internal mixer is set to 23 r / min, and then 3 parts of antioxidant, 0.2 parts of accelerator, 4 parts of cross-linking agent and 2 parts of tackifier are added and mixed for 120 s. After the mixing is completed, the glue is discharged at 70°C, and then it is quickly cooled by cooling water at 20°C, and then kept at 20°C for 24 h to obtain the second-stage masterbatch; S4. Add the second-stage masterbatch obtained in step S3 into an extruder to extrude an extruded film, the extrusion speed of the extruder is 3.7 r / min, the thickness of the extruded film is 0.75 mm, and then the extruded film is vulcanized after being left at room temperature for 24 hours, the vulcanization temperature is 160°C, the pressure is 5 MPa, and the time is 20 min, to obtain a flame retardant rubber material for a synchronous belt of a rail transit shield door.

[0047] The flame retardant grade of the flame retardant rubber material prepared in this embodiment is V-0, and the tensile strength of the flame retardant rubber material is 16.12 Mpa, which is higher than the enterprise standard of 14 Mpa; the rubber material prepared in this embodiment is used to make a synchronous belt for rail transit shield door, and the belt shear of the synchronous belt is measured to be 102 N / m, which is much higher than the national standard of 60 N / m, the T extraction of the synchronous belt is 1236 N, which is much higher than the national standard of 700 N, and the cloth stripping of the synchronous belt is 20 N / m, which is much higher than the national standard of 10 N / m.

[0048] Example 3

[0049] The present embodiment provides a rubber material for a synchronous belt of a rail transit screen door, comprising the following components in parts by weight: 100 parts of chloroprene rubber, 10 parts of butadiene rubber, 3 parts of a dispersant, 8 parts of a plasticizer, 6.8 parts of a scorch retarder, 61 parts of a reinforcing agent, 0.5 parts of an accelerator, 5 parts of an antioxidant, 6 parts of a cross-linking agent, 3 parts of a tackifier, and 15 parts of a flame retardant, wherein the flame retardant is chlorinated paraffin and 1,3,5-triazine-2,4,6-triaminophosphate, and the chlorinated The mass ratio of paraffin wax and 1,3,5-triazine-2,4,6-triaminophosphate is 1:0.89, the dispersant is a complex of surfactant and fatty acid soap, the plasticizer is dioctyl sebacic acid, the anti-scorching agent is layered double metal hydroxide, the reinforcing agent is semi-reinforcing carbon black N550, the accelerator is 3-methyl-2-thiazolethione, the antioxidant is 4,4´-diaminodiphenyl ether, the cross-linking agent is zinc oxide, and the tackifier is hexamethylolmelamine hexamethylene ether.

[0050] It is prepared by the following method: S1, 100 parts of chloroprene rubber are masticated for 185 s on an open mill with a roll gap of 2 mm, and 10 parts of cis-1,4-butadiene rubber are masticated for 35 s on an open mill with a roll gap of 2 mm, and then the masticated chloroprene rubber and cis-1,4-butadiene rubber are mixed and masticated for a second time for 150 s to obtain a mixed masticated rubber; S2, the mixed plasticized rubber obtained in step S1 is added to an internal mixer, the rotor speed of the internal mixer is set to 30 r / min, and then 3 parts of dispersant, 8 parts of plasticizer, 6.8 parts of scorch retarder and 15 parts of flame retardant are added for primary mixing for 190 s, and then the rotor speed of the internal mixer is set to 30 r / min, and 61 parts of reinforcing agent are added for secondary mixing for 310 s, and then the glue is discharged at a temperature of 105°C, and then cooled with cold water at 25°C, and then kept at 25°C for 16 hours to obtain a masterbatch; S3, the first stage masterbatch obtained in step S2 is added to the internal mixer again, the rotor speed of the internal mixer is set to 26 r / min, and then 5 parts of antioxidant, 0.5 parts of accelerator, 6 parts of cross-linking agent and 3 parts of tackifier are added and mixed for 120 s. After the mixing is completed, the glue is discharged at 85°C, and then it is quickly cooled by cooling water at 30°C, and then kept at 30°C for 20h to obtain the second stage masterbatch; S4. Add the second-stage masterbatch obtained in step S3 into an extruder to extrude an extruded film, the extrusion speed of the extruder is 5.3 r / min, the thickness of the extruded film is 0.75 mm, and then the extruded film is vulcanized after being left at room temperature for 38 hours, the vulcanization temperature is 160°C, the pressure is 10 MPa, and the time is 20 min, to obtain a flame retardant rubber material for a synchronous belt of a rail transit shield door.

[0051] The flame retardant grade of the flame retardant rubber material prepared in this embodiment is V-0, and the tensile strength of the flame retardant rubber material is 16.26 Mpa, which is higher than the enterprise standard of 14 Mpa; the rubber material prepared in this embodiment is used to make a synchronous belt for rail transit shield door, and the belt shear of the synchronous belt is measured to be 102 N / m, which is much higher than the national standard of 60 N / m, the T extraction of the synchronous belt is 1226 N, which is much higher than the national standard of 700 N, and the cloth stripping of the synchronous belt is 19 N / m, which is much higher than the national standard of 10 N / m.

[0052] Example 4

[0053] The present embodiment provides a rubber material for a synchronous belt of a rail transit shield door, comprising the following components in parts by weight: 100 parts of chloroprene rubber, 6 parts of butadiene rubber, 3 parts of dispersant, 5 parts of plasticizer, 6.5 parts of anti-scorch agent, 50 parts of reinforcing agent, 0.4 parts of accelerator, 4 parts of antioxidant, 6 parts of cross-linking agent, 2.5 parts of tackifier, and 15 parts of flame retardant, wherein the flame retardant is chlorinated paraffin and 1,3,5-triazine-2,4,6-triaminophosphate, and the chlorinated The mass ratio of paraffin and 1,3,5-triazine-2,4,6-triaminophosphate is 1:0.85, the dispersant is a complex of surfactant and fatty acid soap, the plasticizer is dioctyl sebaceous acid, the anti-scorching agent is dioctyl sebaceous acid, the reinforcing agent is high wear-resistant carbon black N330, the accelerator is 3-methyl-2-thiazolethione, the antioxidant is 4,4´-diaminodiphenyl ether, the cross-linking agent is zinc oxide, and the tackifier is hexahydroxymethylmelamine hexmethyl ether.

[0054] It is prepared by the following method: S1, 100 parts of chloroprene rubber are masticated for 185 s on an open mill with a roll gap of 2 mm, and 6 parts of cis-1,4-butadiene rubber are masticated for 55 s on an open mill with a roll gap of 2 mm, and then the masticated chloroprene rubber and cis-1,4-butadiene rubber are mixed and masticated for a second time for 145 s to obtain a mixed masticated rubber; S2, the mixed plasticized rubber obtained in step S1 is added to an internal mixer, the rotor speed of the internal mixer is set to 28 r / min, and then 3 parts of dispersant, 5 parts of plasticizer, 6.5 parts of scorch retarder and 15 parts of flame retardant are added for a first mixing for 185 s, and then the rotor speed of the internal mixer is set to 28 r / min, 50 parts of reinforcing agent are added, and a second mixing is performed for 305 s, and then the glue is discharged at a temperature of 98°C, and then cooled with cold water at 25°C, and then kept at 25°C for 20 h to obtain a masterbatch; S3, the first stage masterbatch obtained in step S2 is added to the internal mixer again, the rotor speed of the internal mixer is set to 24 r / min, and then 4 parts of antioxidant, 0.4 parts of accelerator, 6 parts of cross-linking agent and 2.5 parts of tackifier are added and mixed for 95 s. After the mixing is completed, the glue is discharged at 75°C, and then it is quickly cooled by cooling water at 22°C, and then kept at 22°C for 20 h to obtain the second stage masterbatch; S4. Add the second-stage masterbatch obtained in step S3 into an extruder to extrude an extruded film, the extrusion speed of the extruder is 3.9 r / min, the thickness of the extruded film is 0.7 mm, and then the extruded film is vulcanized after being left at room temperature for 24 hours, the vulcanization temperature is 160°C, the pressure is 10 MPa, and the time is 20 min, to obtain a flame retardant rubber material for a synchronous belt of a rail transit shield door.

[0055] The flame retardant grade of the flame retardant rubber material prepared in this embodiment is V-0, and the tensile strength of the flame retardant rubber material is 16.52 Mpa, which is higher than the enterprise standard of 14 Mpa; the rubber material prepared in this embodiment is used to make a synchronous belt for rail transit shield door, and the belt shear of the synchronous belt is measured to be 107 N / m, which is much higher than the national standard of 60 N / m, the T extraction of the synchronous belt is 1296 N, which is much higher than the national standard of 700 N, and the cloth stripping of the synchronous belt is 21 N / m, which is much higher than the national standard of 10 N / m.

[0056] Example 5

[0057] The present embodiment provides a rubber material for a synchronous belt of a rail transit shield door, comprising the following components in parts by weight: 90 parts of chloroprene rubber, 6 parts of butadiene rubber, 1 part of a dispersant, 5 parts of a plasticizer, 4 parts of a scorch retarder, 52 parts of a reinforcing agent, 0.2 parts of an accelerator, 4 parts of an antioxidant, 4 parts of a cross-linking agent, 2.5 parts of a tackifier, and 11 parts of a flame retardant, wherein the flame retardant is chlorinated paraffin and 1,3,5-triazine-2,4,6-triaminophosphate, and the chlorinated paraffin and The mass ratio of 1,3,5-triazine-2,4,6-triaminophosphate is 1:0.83, the dispersant is a complex of surfactant and fatty acid soap, the plasticizer is dioctyl sebacic acid, the scorch retarder is magnesium oxide and layered double metal hydroxide, the reinforcing agent is high wear-resistant carbon black N330, the accelerator is 3-methyl-2-thiazolethione, the antioxidant is 4,4´-diaminodiphenyl ether, the cross-linking agent is zinc oxide, and the tackifier is hexahydroxymethylmelamine hexmethyl ether.

[0058] It is prepared by the following method: S1, 90 parts of chloroprene rubber are masticated for 200 s on an open mill with a roll gap of 2 mm, and 6 parts of cis-1,4-butadiene rubber are masticated for 50 s on an open mill with a roll gap of 2 mm, and then the masticated chloroprene rubber and cis-1,4-butadiene rubber are mixed and masticated for a second time for 135 s to obtain a mixed masticated rubber; S2, the mixed plasticized rubber obtained in step S1 is added to an internal mixer, the rotor speed of the internal mixer is set to 29 r / min, and then 1 part of dispersant, 5 parts of plasticizer, 4 parts of scorch retarder and 11 parts of flame retardant are added for primary mixing for 185 s, and then the rotor speed of the internal mixer is set to 28 r / min, and 52 parts of reinforcing agent are added for secondary mixing for 305 s, and then the rubber is discharged at a temperature of 105°C, and then cooled with cold water at 25°C, and kept at 25°C for 20 h to obtain a masterbatch; S3, the first stage masterbatch obtained in step S2 is added to the internal mixer again, the rotor speed of the internal mixer is set to 25 r / min, and then 4 parts of antioxidant, 0.2 parts of accelerator, 4 parts of cross-linking agent and 2.5 parts of tackifier are added and mixed for 110 s. After the mixing is completed, the glue is discharged at 80°C, and then it is quickly cooled by cooling water at 30°C, and then kept at 30°C for 22 h to obtain the second stage masterbatch; S4. Add the second-stage masterbatch obtained in step S3 into an extruder to extrude an extruded film, the extrusion speed of the extruder is 4.5 r / min, the thickness of the extruded film is 0.75 mm, and then the extruded film is vulcanized after being left at room temperature for 35 hours, the vulcanization temperature is 160°C, the pressure is 10 MPa, and the time is 20 min, to obtain a flame retardant rubber material for a synchronous belt of a rail transit shield door.

[0059] The flame retardant grade of the flame retardant rubber material prepared in this embodiment is V-0, and the tensile strength of the flame retardant rubber material is 16.22 Mpa, which is higher than the enterprise standard of 14 Mpa; the rubber material prepared in this embodiment is used to make a synchronous belt for rail transit shield door, and the belt shear of the synchronous belt is measured to be 104 N / m, which is much higher than the national standard of 60 N / m, the T extraction of the synchronous belt is 1276 N, which is much higher than the national standard of 700 N, and the cloth stripping of the synchronous belt is 20 N / m, which is much higher than the national standard of 10 N / m.

[0060] Example 6

[0061] The present embodiment provides a rubber material for a synchronous belt of a rail transit screen door, comprising the following components in parts by weight: 93 parts of chloroprene rubber, 8 parts of butadiene rubber, 2 parts of dispersant, 7 parts of plasticizer, 5 parts of scorch retarder, 58 parts of reinforcing agent, 0.3 parts of accelerator, 4 parts of antioxidant, 5 parts of cross-linking agent, 3 parts of tackifier, and 15 parts of flame retardant, wherein the flame retardant is chlorinated paraffin and 1,3,5-triazine-2,4,6-triaminophosphate, and the chlorinated paraffin and 1,3,5-triazine-2,4,6-triaminophosphate are used. The mass ratio of triazine-2,4,6-triaminophosphate is 1:0.83, the dispersant is a complex of surfactant and fatty acid soap, the plasticizer is dioctyl sebacic acid, the scorch retarder is magnesium oxide and layered double metal hydroxide, the reinforcing agent is high wear-resistant carbon black N330 and semi-reinforcing carbon black N550, the accelerator is 3-methyl-2-thiazolethione, the antioxidant is 4,4´-diaminodiphenyl ether, the cross-linking agent is zinc oxide, and the tackifier is hexamethylolmelamine hexamethylene ether.

[0062] It is prepared by the following method: S1, 93 parts of chloroprene rubber were masticated for 25 s on an open mill with a roll gap of 2 mm, and 8 parts of cis-1,4-butadiene rubber were masticated for 210 s on an open mill with a roll gap of 2 mm, and the masticated chloroprene rubber and cis-1,4-butadiene rubber were mixed and masticated for a second time for 150 s to obtain a mixed masticated rubber; S2. The mixed plasticized rubber obtained in step S1 is added to an internal mixer, the rotor speed of the internal mixer is set to 30 r / min, and then 2 parts of dispersant, 7 parts of plasticizer, 5 parts of scorch retarder and 15 parts of flame retardant are added for primary mixing for 170 s, and then the rotor speed of the internal mixer is set to 30 r / min, and 58 parts of reinforcing agent are added for secondary mixing for 290 s, and then the rubber is discharged at a temperature of 90°C, and then cooled with cold water at 25°C, and then kept at 25°C for 20 h to obtain a masterbatch; S3, the first stage masterbatch obtained in step S2 is added to the internal mixer again, the rotor speed of the internal mixer is set to 26 r / min, and then 4 parts of antioxidant, 0.3 parts of accelerator, 5 parts of cross-linking agent and 3 parts of tackifier are added and mixed for 90 s. After the mixing is completed, the glue is discharged at 85°C, and then it is quickly cooled by cooling water at 25°C, and then kept at 25°C for 20 h to obtain the second stage masterbatch; S4. Add the second-stage masterbatch obtained in step S3 into an extruder to extrude an extruded film, the extrusion speed of the extruder is 5.3 r / min, the thickness of the extruded film is 0.65 mm, and then the extruded film is vulcanized after being left at room temperature for 24 hours, the vulcanization temperature is 160°C, the pressure is 5 MPa, and the time is 20 min, to obtain a flame retardant rubber material for a synchronous belt of a rail transit shield door.

[0063] The flame retardant grade of the flame retardant rubber material prepared in this embodiment is V-0, and the tensile strength of the flame retardant rubber material is 16.41 Mpa, which is higher than the enterprise standard of 14 Mpa; the rubber material prepared in this embodiment is used to make a synchronous belt for rail transit shield door, and the belt shear of the synchronous belt is measured to be 105 N / m, which is much higher than the national standard of 60 N / m, the T extraction of the synchronous belt is 1283 N, which is much higher than the national standard of 700 N, and the cloth stripping of the synchronous belt is 20 N / m, which is much higher than the national standard of 10 N / m.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flame retardant rubber material for rail transit screen door synchronous belt, characterized in that: The flame retardant rubber material comprises the following components in parts by weight: 90-100 parts of chloroprene rubber, 0.1-10 parts of butadiene rubber, 3.8-6.8 parts of scorch retarder, 46-61 parts of reinforcing agent, 0.2-0.5 parts of accelerator, 3-5 parts of antioxidant, 1-3 parts of dispersant, 2-8 parts of plasticizer, 4-6 parts of cross-linking agent, 2-3 parts of tackifier and 11-15 parts of flame retardant. The flame retardant is a compound flame retardant comprising chlorinated paraffin and phosphorus-nitrogen compounds.

2. The flame retardant rubber material according to claim 1, characterized in that: The mass ratio of the chlorinated paraffin and the phosphorus-nitrogen compound in the composite flame retardant is 1:0.83; And / or, the phosphorus-nitrogen compound includes 1,3,5-triazine-2,4,6-triamine phosphate.

3. The flame retardant rubber material according to claim 1, characterized in that: The scorch retarder includes one or more of magnesium oxide and layered double metal hydroxide; And / or, the reinforcing agent includes one or more of high wear-resistant carbon black N330 and semi-reinforcing carbon black N550; and / or, the accelerator comprises one or more of 3-methyl-2-thiazolethione and 2,2'-dibenzothiazole disulfide; And / or, the antioxidant includes 4,4´-diaminodiphenyl ether; and / or, the dispersant comprises a complex of a surfactant and a fatty acid soap; And / or, the plasticizer includes dioctyl sebacate; and / or, the cross-linking agent comprises zinc oxide; And / or, the viscosity increasing agent includes hexamethylolmelamine.

4. A method for preparing the flame retardant rubber material according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, chloroprene rubber and cis-1,1-butadiene rubber are respectively subjected to a first mastication on an open mill, the masticated chloroprene rubber and cis-1,1-butadiene rubber are mixed, and a second mastication is performed to obtain a mixed masticated rubber; the mass fractions of the chloroprene rubber and cis-1,1-butadiene rubber are 90-100 parts and 0.1-10 parts, respectively; S2, adding the mixed plasticized rubber obtained in step S1 into an internal mixer, adding a dispersant, a plasticizer, a scorch retarder and a flame retardant for primary mixing, then adding a reinforcing agent for secondary mixing and then draining, and then rapidly cooling with water and then heat-insulating to obtain a masterbatch, wherein the mass fractions of the dispersant, the plasticizer, the scorch retarder, the reinforcing agent and the flame retardant are 1-3 parts, 2-8 parts, 3.8-6.8 parts, 46-61 parts and 11-15 parts respectively; S3, adding the first stage of masterbatch after heat preservation in step S2 into the internal mixer again, and then adding antioxidant, accelerator, crosslinking agent and tackifier to mix, after mixing, the glue is discharged, and then the second stage of masterbatch is obtained after rapid water cooling and heat preservation, wherein the weight proportions of the antioxidant, accelerator, crosslinking agent and tackifier are 3-5 parts, 0.2-0.5 parts, 4-6 parts and 2-3 parts respectively; S4, adding the second-stage masterbatch obtained in step S3 into an extruder to extrude an extruded film, and then standing the extruded film at room temperature for 24-38 hours and vulcanizing the extruded film to obtain a rubber material for a synchronous belt of a rail transit shield door.

5. The method for preparing the flame retardant rubber material according to claim 4, characterized in that: The roller spacing of the mixing mill in step S1 is 1.5-2 mm; And / or, the primary plasticizing time of the chloroprene rubber in step S1 is 180-210 s, and the primary plasticizing time of the butadiene rubber is 30-60 s; And / or, the time of the secondary plasticizing in step S1 is 120-150 s.

6. The method for preparing the flame retardant rubber material according to claim 4, characterized in that: In step S2, during the first mixing, the rotor speed of the internal mixer is 27-30 r / min and the mixing time is 170-190 s; And / or, in step S2, during the secondary mixing, the rotor speed of the internal mixer is 27-30 r / min and the mixing time is 290-310 s; And / or, the debinding temperature in step S2 is 90-105°C.

7. The method for preparing the flame retardant rubber material according to claim 4, characterized in that: In step S3, during the mixing, the speed of the internal mixer is 23-26 r / min, and the mixing time is 90-120 s; And / or, the temperature of the debinding in step S3 is 70-85°C; And / or, the temperature of the cooling water for the rapid water cooling in step S2 and step S3 is 20-30°C; And / or, the insulation time in step S2 and step S3 is 16-24 h and the insulation temperature is 20-30° C.

8. The method for preparing the flame retardant rubber material according to claim 4, characterized in that: The extrusion speed in step S4 is 3.7-5.3 r / min; And / or, the thickness of the extruded film in step S4 is 0.65-0.75 mm; And / or, the vulcanization temperature in step S4 is 160° C., the pressure is 5-10 Mpa, and the time is 23 min.

9. A synchronous belt for a rail transit screen door, characterized in that: The flame retardant rubber material is made from the flame retardant rubber material according to any one of claims 1 to 3.

10. Use of the flame retardant rubber material according to any one of claims 1 to 3 in the field of rail transportation.