Halogen-free rubber conveyor belt compound and method for producing the same

Abstract

The application relates to the technical field of conveying belts, and particularly discloses a halogen-free rubber conveying belt rubber compound and a preparation method thereof. The halogen-free rubber conveying belt rubber compound comprises the following raw materials in parts by weight: 15-25 parts of natural rubber; 45-55 parts of styrene-butadiene rubber; 25-35 parts of butadiene rubber; 50-100 parts of a halogen-free flame retardant; 50-80 parts of a filler; 2-5 parts of a vulcanizing agent; and 5-15 parts of an additive. The halogen-free flame retardant comprises ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, a flame retardant MB202 and diphenyl isooctyl phosphate. The preparation method comprises the following steps: S1, raw material preparation; and S2, rubber compound preparation. The halogen-free rubber conveying belt rubber compound can be used in the conveying belts for materials in the fields of coal transportation, mining, metallurgy and chemical industry, and has the advantages of high-temperature resistance, high mechanical performance, long service life and the like.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of brazing filler metal, in particular to a halogen-free rubber conveyor belt compound and a preparation method thereof. BACKGROUND

[0002] The rubber conveyor belt is an important industrial product, and is widely used in modern production and transportation as a main component of a belt conveyor. The rubber conveyor belt is mainly used for large-scale continuous transportation in coal, mine, metallurgy, chemical industry, construction and transportation departments.

[0003] Among them, the slag of many blast furnaces in the metallurgical industry is directly placed on the conveyor belt, and the temperature is very high and with sparks, which is more likely to cause melting, damage, burning and other phenomena of the conveyor belt, seriously affecting the service life of the conveyor belt. Therefore, how to improve the high temperature resistance of the conveyor belt and prolong the service life of the conveyor belt is a problem that needs to be solved at present. SUMMARY

[0004] In order to improve the defects of high cost of solder, poor processing performance and poor oxidation resistance, the application provides a halogen-free rubber conveyor belt compound and a preparation method thereof.

[0005] The application provides a halogen-free rubber conveyor belt compound, which adopts the following technical scheme:

[0006] In a first aspect, the application provides a halogen-free rubber conveyor belt compound, which comprises the following raw materials by weight:

[0007] 15-25 parts of natural rubber;

[0008] 40-60 parts of styrene-butadiene rubber;

[0009] 25-35 parts of butadiene rubber;

[0010] 50-100 parts of halogen-free flame retardant;

[0011] 50-80 parts of filler;

[0012] 2-5 parts of vulcanizing agent;

[0013] 5-15 parts of auxiliary agent;

[0014] The halogen-free flame retardant comprises ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, flame retardant MB202 and diphenyl isooctyl phosphate.

[0015] By adopting the technical scheme, the natural rubber has excellent comprehensive performance, the styrene-butadiene rubber has excellent low rolling resistance performance and wear resistance, and the cis-butadiene rubber has the advantages of elasticity, good wear resistance, excellent low temperature resistance, good flex resistance, and less heat generation, so the natural rubber, the styrene-butadiene rubber, and the cis-butadiene rubber are preferably used as the base material of the rubber compound, and the rubber compound with excellent mechanical properties and excellent heat resistance can be obtained.

[0016] The application preferably uses ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, flame retardant MB202, and diphenyl isooctyl phosphate as the halogen-free flame retardant, and the metal hydroxide, phosphorus-nitrogen flame retardant, silicon flame retardant, intumescent flame retardant, and nano composite material are compounded as the halogen-free flame retardant, so that the rubber compound has excellent high-temperature resistance and flame retardation.

[0017] Optionally, the mass ratio of the ammonium polyphosphate, the magnesium hydroxide, the zinc borate, the melamine phosphate, the flame retardant MB202, and the diphenyl isooctyl phosphate is 12:16:8:9:14:8-10.

[0018] By adopting the technical scheme, the ratio of the components in the halogen-free flame retardant is optimized, and under the appropriate ratio, the excellent synergistic effect between the various types of flame retardants can be achieved, and the heat resistance and flame retardation of the rubber compound are further improved. Meanwhile, the application preferably uses magnesium hydroxide and zinc borate as two inorganic flame retardants, and the magnesium hydroxide can replace part of the zinc borate, reduce the amount of zinc borate, reduce the cost of the rubber compound, and optimize the mass ratio of the magnesium hydroxide and the zinc borate to maintain the heat resistance and flame retardation of the rubber compound.

[0019] Optionally, the magnesium hydroxide has a hexagonal sheet structure.

[0020] By adopting the technical scheme, the hexagonal sheet structure of the magnesium hydroxide is preferably used as the flame retardant, and the hexagonal sheet structure of the magnesium hydroxide has a regular shape, a uniform particle size distribution, and a low specific surface area, so that the magnesium hydroxide can be uniformly dispersed in the rubber compound, and the magnesium oxide with a large specific surface area can be formed during decomposition, which can improve the adsorption effect of the flame retardant on smoke, further reduce smoke emission, and improve the flame retardation of the rubber compound.

[0021] Optionally, the magnesium hydroxide is prepared as follows: magnesium chloride solution and ammonia water are added to a container, stirred and mixed, PEG-8000 is added, stirred, high-pressure sealed reaction, the precipitate is collected, washed, and dried to obtain the hexagonal sheet structure of the magnesium hydroxide.

[0022] By adopting the technical scheme, the preparation process of the magnesium hydroxide is optimized, and the PEG-8000 is used as a structure directing agent to obtain the hexagonal sheet structure of the magnesium hydroxide with high crystallinity and regular shape.

[0023] Optionally, the magnesium hydroxide is magnesium hydroxide modified by sodium oleate.

[0024] By using the above technical solution, the magnesium hydroxide is modified by sodium oleate, and sodium oleate can hydrolyze C 17 H 33C OO - and is stably adsorbed on the surface of magnesium hydroxide, so that the magnesium hydroxide changes from hydrophilic to hydrophobic, that is, the surface polarity of the magnesium hydroxide is further reduced, the dispersion effect of the magnesium hydroxide in the rubber compound is improved, and the magnesium hydroxide can effectively replace zinc borate to achieve a suitable flame retardation effect.

[0025] Optionally, the filler includes carbon black, basalt fiber, attapulgite, and polytetrafluoroethylene.

[0026] By using the above technical solution, preferably, different materials with different structures such as carbon black, basalt fiber, and attapulgite are used as fillers. The carbon black has a spherical or flaky structure, the basalt fiber has a long fiber structure, and the attapulgite has a short fiber structure. Therefore, the fillers can form an interlaced filler network structure in the rubber compound, and the fiber structure can physically load the carbon black to reduce the agglomeration of the carbon black and improve the dispersibility of the fillers. The addition of polytetrafluoroethylene can wrap and lubricate the fillers, improve the dispersibility of the fillers, and make the rubber compound have uniform strength. At the same time, the polytetrafluoroethylene powder can also cover the wear surface during friction to form a lubricating layer, thereby improving the hydrophobicity and wear resistance of the rubber compound.

[0027] Optionally, the carbon black is ozone-modified carbon black.

[0028] By using the above technical solution, the modification of the carbon black by ozone can increase the oxygen-containing functional groups on the surface of the carbon black, increase the surface free energy of the carbon black, improve the bonding effect between the carbon black and the natural rubber, and promote the construction of the filler network in the filler, thereby effectively improving the mechanical strength and wear resistance of the rubber compound.

[0029] Optionally, the attapulgite is phenolic resin-modified attapulgite.

[0030] By using the above technical solution, the attapulgite is modified by phenolic resin, the phenolic hydroxyl groups in the phenolic resin can react with active groups such as silicon hydroxyl groups in the attapulgite, an organic-inorganic hybrid network can be formed, and the basalt fiber in the filler can be combined to form a complex filler network. After the filler is added to the rubber compound, a complex resin network and rubber network interpenetrated network structure can be formed, which can effectively improve the mechanical properties and wear resistance of the rubber compound, thereby prolonging the service life of the rubber compound.

[0031] Optionally, the basalt fibers are loaded with glass microspheres or corundum.

[0032] By adopting the above technical solution, glass microspheres loaded onto basalt fibers can improve the bonding effect between basalt fibers and the adhesive. Furthermore, the introduction of a regular spherical structure further reduces the possibility of filler agglomeration, ensuring uniform dispersion of the filler in the adhesive and reducing the transport resistance of the adhesive. Carborundum, with its multi-layered spherical structure, can interact with carbon black to form a denser adhesive network structure, effectively improving the mechanical properties of the adhesive. Moreover, carborundum can synergistically interact with polytetrafluoroethylene (PTFE), improving the hydrophobicity of the adhesive.

[0033] Secondly, this application provides a method for preparing halogen-free rubber conveyor belt compound, which adopts the following technical solution:

[0034] A method for preparing a halogen-free rubber conveyor belt compound includes the following steps:

[0035] S1. Raw material preparation: Take natural rubber, styrene-butadiene rubber, cis-butadiene rubber, halogen-free flame retardant, filler, vulcanizing agent and additives according to the weight parts;

[0036] S2. Rubber compound preparation: First, place natural rubber in a mixer and mix it to obtain plasticized rubber. Then, put the plasticized rubber, styrene-butadiene rubber, and butadiene rubber into the mixer and mix them. Add additives and fillers to the mixer and continue mixing. Add flame retardants and vulcanizing agents, sheet out, and cool to obtain the rubber compound.

[0037] In summary, this application has the following beneficial effects:

[0038] 1. Since this application preferably uses ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, flame retardant MB202 and diphenyl isooctyl phosphate as halogen-free flame retardants, and uses metal hydroxides, phosphorus and nitrogen flame retardants, silicon flame retardants, intumescent flame retardants, nanocomposite materials and other compounded as halogen-free flame retardants, the adhesive can obtain a better high-temperature flame retardant effect.

[0039] 2. In this application, hexagonal plate-shaped magnesium hydroxide is preferably used as a flame retardant. The hexagonal plate-shaped magnesium hydroxide has a regular morphology, uniform particle size distribution, and low specific surface area, which allows magnesium hydroxide to be uniformly dispersed in the adhesive. Moreover, when it decomposes, it can form magnesium oxide with a large specific surface area, which can improve the adsorption effect of the flame retardant on smoke and dust, further reduce smoke emissions, and improve the flame retardant effect of the adhesive.

[0040] 3、The filler in the application can form an interlaced filler network structure in the rubber compound, and the fiber structure can appropriately physically load the carbon black, can reduce the agglomeration of the carbon black, so that the filler has better dispersibility. The addition of polytetrafluoroethylene can wrap and lubricate the filler, improve the dispersibility of the filler, and make the rubber compound have uniform strength; at the same time, the polytetrafluoroethylene powder can also cover the wear surface during friction to form a lubricating layer, thereby improving the hydrophobicity and wear resistance of the rubber compound. DETAILED DESCRIPTION

[0041] The application will be further described in detail below in combination with examples.

[0042] Preparation Example

[0043] Magnesium hydroxide preparation example

[0044] Preparation Example 1

[0045] A 1 mol / L magnesium chloride solution and 1 mol / L ammonia water were added to a container and stirred and mixed for 10 min, PEG-8000 was added, the addition amount of PEG-8000 was 3%, stirring, transferred to an autoclave, reacted at 120°C under high pressure sealing for 12h, the precipitate was collected, washed, dried at 80°C for 6h, and hexagonal flake structure magnesium hydroxide was obtained.

[0046] Preparation Example 2

[0047] A 1 mol / L magnesium chloride solution and 1 mol / L ammonia water were added to a container and stirred and mixed for 10 min, PEG-600 was added, the addition amount of PEG-600 was 3%, stirring, transferred to an autoclave, reacted at 120°C under high pressure sealing for 12h, the precipitate was collected, washed, dried at 80°C for 6h, and hexagonal flake structure magnesium hydroxide was obtained.

[0048] Preparation Example 3

[0049] 5.0g of Mg(OH)2 powder prepared in Preparation Example 1 was weighed, water was added to prepare a slurry with a mass fraction of 3%, transferred to a container and stirred, and after uniform mixing, 3% sodium oleate was added under water bath conditions for reaction. After the reaction was completed, it was naturally cooled to room temperature, washed with distilled water for 3 times, and then dried in a vacuum drying oven at 80°C for 6h to obtain modified magnesium hydroxide.

[0050] Carbon black preparation example

[0051] Preparation Example 4

[0052] The carbon black is placed in a wide-mouth bottle with a rubber plug, ozone is introduced, and the carbon black is treated. The gas flow of the ozone generator is 5 L / min-1, the mass concentration is 60 mg·L-1, and the treatment time is 72 h. The ozone-modified carbon black is obtained.

[0053] Preparation example of palygorskite

[0054] Preparation example 5

[0055] In a container, phenol is added and heated to 50 DEG C until the phenol melts. Oxalic acid is added to adjust the pH to 1. Formaldehyde is added dropwise (molar ratio of phenol to formaldehyde is 1) under reflux conditions. The reaction is carried out under reflux at 100 DEG C. After the reflux is completed, an aqueous solution containing palygorskite is added. Stirring is continued. Distillation is carried out under reduced pressure at 150 DEG C and -0.5 MPa. The reaction is stopped. The hybrid palygorskite is obtained. The mass ratio of phenolic resin to palygorskite is 10:1.

[0056] Preparation example of basalt fiber

[0057] Preparation example 6

[0058] The mass fraction of KH550 is 10%, which is mixed with anhydrous ethanol to obtain a mixed solution. The pH of the mixed solution is adjusted to 4-5. Glass beads are added to the mixed solution (solid-liquid ratio is 1:5). Stirring is carried out for 2 h. Filtration, washing, and drying are carried out. The modified glass beads are obtained. The modified glass beads are mixed with epoxy resin at a mass ratio of 1:1 to obtain epoxy-modified glass beads. The epoxy-modified glass beads are mixed with basalt fibers. Stirring and dispersion are carried out. Filtration, drying, oscillation separation, and crushing are carried out. The modified basalt fibers are obtained.

[0059] Preparation example 7

[0060] The mass fraction of KH550 is 10%, which is mixed with anhydrous ethanol to obtain a mixed solution. The pH of the mixed solution is adjusted to 4-5. Corundum is added to the mixed solution (solid-liquid ratio is 1:5). Stirring is carried out for 2 h. Filtration, washing, and drying are carried out. The modified corundum is obtained. The modified corundum is mixed with epoxy resin at a mass ratio of 1:1 to obtain epoxy-modified corundum. The epoxy-modified corundum is mixed with basalt fibers. Stirring and dispersion are carried out. Filtration, drying, oscillation separation, and crushing are carried out. The modified basalt fibers are obtained.

[0061] Example

[0062] Examples 1-3

[0063] In one aspect, the present application provides a halogen-free rubber conveyor belt compound, which comprises natural rubber, styrene-butadiene rubber, butadiene rubber, halogen-free flame retardant, filler, vulcanizing agent, and additive. The specific mass is shown in the following table.

[0064] The styrene-butadiene rubber is solution polymerized styrene-butadiene rubber.

[0065] The halogen-free flame retardant includes ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, flame retardant MB202 and diphenyl isooctyl phosphate in a mass ratio of 12:16:8:9:14:8.

[0066] The filler includes carbon black, basalt fiber, attapulgite and polytetrafluoroethylene in equal mass ratio.

[0067] The vulcanizing agent includes lanthanum cerium sulfide and sulfur in a mass ratio of 1:4.

[0068] The auxiliary agent includes antioxidant RD, accelerator CZ, protective wax, anti-scorching agent CTP, accelerator TMTD and antioxidant 4020 in equal mass ratio.

[0069] In another aspect, the application provides a preparation method of a halogen-free rubber conveyor belt compound, including the following steps:

[0070] S1, raw material preparation: take natural rubber, styrene butadiene rubber, cis-butadiene rubber, halogen-free flame retardant, filler, vulcanizing agent and auxiliary agent in weight parts respectively;

[0071] S2, compound preparation: first place the natural rubber in the internal mixer, and perform internal mixing treatment for 3 min at 40 rpm to obtain plasticated rubber; put the plasticated rubber, styrene butadiene rubber and cis-butadiene rubber into the internal mixer, and mix for 1 min at 50 rpm; continue to mix for 3 min after adding the auxiliary agent and the filler into the internal mixer, discharge at 140°C, add the flame retardant and the vulcanizing agent, stir for 3 min at 450 rpm, discharge at 100°C, take out the sheet, cool, stop for 8 h, and obtain the compound.

[0072] Table 1 composition of examples 1-3

[0073] weight / kg Example 1 Example 2 Example 3 Natural rubber 15 20 25 Styrene-butadiene rubber 60 50 40 Butadiene rubber 25 30 35 Halogen-free flame retardant 60 80 100 Filler 50 65 80 Vulcanizing agent 2 3 5 Auxiliary 5 10 15

[0074] Example 4

[0075] The difference from example 2 is that the halogen-free flame retardant includes ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, flame retardant MB202 and diphenyl isooctyl phosphate in a mass ratio of 12:16:8:9:14:10.

[0076] Example 5

[0077] The difference from example 2 is that the halogen-free flame retardant includes ammonium polyphosphate, magnesium hydroxide prepared in preparation example 1, zinc borate, melamine phosphate, flame retardant MB202 and diphenyl isooctyl phosphate in a mass ratio of 12:16:8:9:14:8.

[0078] Example 6

[0079] The difference from Example 2 is that the halogen-free flame retardant comprises ammonium polyphosphate, magnesium hydroxide prepared in Preparation Example 2, zinc borate, melamine phosphate, flame retardant MB202, and diphenyl isooctyl phosphate in a mass ratio of 12:16:8:9:14:10.

[0080] Example 7

[0081] The difference from Example 2 is that the halogen-free flame retardant comprises ammonium polyphosphate, magnesium hydroxide prepared in Preparation Example 3, zinc borate, melamine phosphate, flame retardant MB202, and diphenyl isooctyl phosphate in a mass ratio of 12:16:8:9:14:10.

[0082] Example 8

[0083] The difference from Example 2 is that the filler comprises carbon black, basalt fiber, attapulgite, and polytetrafluoroethylene prepared in Preparation Example 4 in an equal mass ratio.

[0084] Example 9

[0085] The difference from Example 2 is that the filler comprises carbon black, basalt fiber, attapulgite prepared in Preparation Example 5, and polytetrafluoroethylene prepared in Preparation Example 4 in an equal mass ratio.

[0086] Example 10

[0087] The difference from Example 2 is that the filler comprises carbon black, basalt fiber prepared in Preparation Example 6, attapulgite prepared in Preparation Example 5, and polytetrafluoroethylene prepared in Preparation Example 4 in an equal mass ratio.

[0088] Example 11

[0089] The difference from Example 2 is that the filler comprises carbon black, basalt fiber prepared in Preparation Example 7, attapulgite prepared in Preparation Example 5, and polytetrafluoroethylene prepared in Preparation Example 4 in an equal mass ratio.

[0090] Comparative Example

[0091] Comparative Example 1

[0092] The difference between this comparative example and Example 2 is that only ammonium polyphosphate is used as the halogen-free flame retardant in the comparative example.

[0093] Comparative Example 2

[0094] The difference between this comparative example and Example 2 is that magnesium hydroxide is not added to the halogen-free flame retardant in the comparative example.

[0095] Performance detection test

[0096] (1) High temperature resistance test: the tensile properties of the rubber compound were tested using a GT-7017 high temperature aging test chamber according to GB / T 3512-2014 "Vulcanized rubber or thermoplastic rubber hot air accelerated aging and heat resistance test". The heat treatment was 180°C for 168h.

[0097] (2) Flame retardant performance test: according to ASTM D2863-2000 standard, HC-2 oxygen index instrument (Nanjing Jiangning Analysis Instrument Factory) was used to determine LOI (limiting oxygen index, the minimum oxygen percentage required to maintain the sample material combustion in nitrogen-oxygen mixed gas, used to characterize the flame retardant effect of the flame retardant), the sample size was 140mm x 6mm x 3mm.

[0098] (3) Abrasion resistance test: a MH-74 type DIN abrasion tester was used to test the abrasion resistance according to GB / T 9867-2008, three samples were tested and the average value was taken.

[0099] Table 2 Performance test

[0100]

[0101]

[0102] From the comparison of the performance test in Table 2, it can be found that:

[0103] 1. From the comparison of Examples 1-3 and Comparative Examples 1-2, it can be found that the high temperature resistance, flame retardant performance and abrasion resistance of the rubber compound prepared in Examples 1-3 are improved, which shows that in the present application, the metal hydroxide, phosphorus-nitrogen flame retardant, silicon flame retardant, intumescent flame retardant, nanocomposite and the like are compounded as halogen-free flame retardants, which can obtain excellent high temperature resistance and flame retardant effect. The filler can form an interlaced filler network structure in the rubber compound, and the fiber structure can provide appropriate physical load to the carbon black, which can reduce the agglomeration of the carbon black and improve the dispersion of the filler. The addition of polytetrafluoroethylene can wrap and lubricate the filler, improve the dispersion of the filler, and make the rubber compound have uniform strength; at the same time, the polytetrafluoroethylene powder can also cover the wear surface during friction to form a lubricating layer, thereby improving the hydrophobicity and wear resistance of the rubber compound.

[0104] 2. From the comparison of Example 4 and Example 2, it can be found that the high temperature resistance, flame retardant performance and abrasion resistance of the rubber compound prepared in Example 4 are decreased, which shows that in the present application, the ratio of each component in the halogen-free flame retardant is optimized, and under the appropriate ratio, the excellent synergistic effect between each type of flame retardant can be achieved, which further improves the heat resistance and flame retardant effect of the rubber compound.

[0105] 3、Comparing Example 5-6 with Example 2, it can be found that the tensile strength, high temperature resistance, flame retardant property and wear resistance of the rubber compound prepared in Example 5-6 are all improved, which shows that the hexagonal flake-shaped magnesium hydroxide used as the flame retardant in the present application has regular morphology, uniform particle size distribution and low specific surface area, so that the magnesium hydroxide can be uniformly dispersed in the rubber compound, and can form magnesium oxide with large specific surface area during decomposition, which can improve the adsorption effect of the flame retardant on smoke, further reduce smoke emission and improve the flame retardant effect of the rubber compound. The PEG-8000 used as the structure directing agent can obtain hexagonal flake-shaped magnesium hydroxide with high crystallinity and regular shape.

[0106] 4、Comparing Example 7 with Example 2, it can be found that the tensile strength, high temperature resistance, flame retardant property and wear resistance of the rubber compound prepared in Example 7 are all improved, which shows that the sodium oleate used for modifying the magnesium hydroxide in the present application can hydrolyze C 17 H 33C OO - on the surface of the magnesium hydroxide in the aqueous solution, and is stably adsorbed on the surface of the magnesium hydroxide, so that the magnesium hydroxide changes from hydrophilic to hydrophobic, i.e. the surface polarity of the magnesium hydroxide is further reduced, the dispersion effect of the magnesium hydroxide in the rubber compound is improved, and the magnesium hydroxide can effectively replace zinc borate to achieve appropriate flame retardant effect.

[0107] 5、Comparing Example 8 with Example 2, it can be found that the tensile strength, high temperature resistance, flame retardant property and wear resistance of the rubber compound prepared in Example 7 are all improved, which shows that the ozone treatment in the present application increases the oxygen-containing functional groups on the surface of the carbon black, increases the surface free energy of the carbon black, improves the bonding effect between the carbon black and the rubber compound, and promotes the construction of the filler network in the filler, which can effectively improve the mechanical strength and wear resistance of the rubber compound.

[0108] 6、Comparing Example 9 with Example 2, it can be found that the tensile strength, high temperature resistance, flame retardant property and wear resistance of the rubber compound prepared in Example 9 are all improved, which shows that the phenolic resin can form an organic-inorganic hybrid network with the attapulgite in the present application, which can cooperate with the basalt fiber in the filler to form a complex filler network. After the filler is added to the rubber compound, a network structure in which the complex resin network and the rubber network are interwoven and interpenetrated can be formed, which can effectively improve the mechanical properties and wear resistance of the rubber compound.

[0109] 7、Combined with examples 10-11 and example 2, it can be found that the tensile strength, high temperature resistance, flame retardant property and wear resistance of the rubber compound prepared in example 10 are all improved, which indicates that after the glass microbeads are loaded on the basalt fibers, the combination effect between the basalt fibers and the rubber compound can be improved, and after the regular spherical structure is introduced, the possibility of filler aggregation is further reduced, the filler is uniformly dispersed in the rubber compound, and the conveying resistance of the rubber compound is reduced. The diamond has multiple layers of spheres, which can cooperate with carbon black to form a more compact rubber network structure, which can effectively improve the mechanical properties and wear resistance of the rubber compound.

[0110] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A halogen-free rubber conveyor belt compound, characterized in that, Including the following parts by weight of raw materials: 15-25 parts natural rubber; 40-60 parts of styrene-butadiene rubber; 25-35 parts of butadiene rubber; 50-100 parts of halogen-free flame retardant; 50-80 parts of filler; 2-5 parts of vulcanizing agent; 5-15 parts of auxiliary agent; The halogen-free flame retardant includes ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, flame retardant MB202, and diphenyl isooctyl phosphate. The filler includes carbon black, basalt fiber, attapulgite, and polytetrafluoroethylene. The attapulgite clay is attapulgite clay modified with phenolic resin. The mass ratio of ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, flame retardant MB202, and diphenyl isooctyl phosphate is 12:16:8:9:14:8-10.

2. The halogen-free rubber conveyor belt compound according to claim 1, characterized in that: The magnesium hydroxide was prepared as follows: magnesium chloride solution and ammonia were added to a container, stirred and mixed, PEG-8000 was added, stirred, and the reaction was carried out under high pressure and sealed. The precipitate was collected, washed, and dried to obtain magnesium hydroxide with a hexagonal plate structure.

3. The halogen-free rubber conveyor belt compound according to claim 1, characterized in that: The magnesium hydroxide is magnesium hydroxide modified with sodium oleate.

4. The halogen-free rubber conveyor belt compound according to claim 1, characterized in that: The carbon black is carbon black that has been treated with ozone.

5. The halogen-free rubber conveyor belt compound according to claim 1, characterized in that: The basalt fibers are loaded with glass microspheres or corundum.

6. A method for preparing a halogen-free rubber conveyor belt compound according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Raw material preparation: Take natural rubber, styrene-butadiene rubber, cis-butadiene rubber, halogen-free flame retardant, filler, vulcanizing agent and additives according to the weight parts; S2. Rubber compound preparation: First, place natural rubber in a mixer and mix it to obtain plasticized rubber. Then, put the plasticized rubber, styrene-butadiene rubber, and butadiene rubber into the mixer and mix them. Add additives and fillers to the mixer and continue mixing. Add flame retardants and vulcanizing agents, sheet out, and cool to obtain the rubber compound.

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