Flame-retardant conveyor belt and preparation process thereof

Abstract

The present invention discloses a flame retardant conveyor belt and a preparation process thereof, which relate to the technical field of conveyor belts. The flame retardant conveyor belt is made of the following components: styrene-butadiene rubber, white carbon black, sulfur, an elastomer flame retardant composite, a composite filler, an antioxidant, natural rubber, stearic acid, a plasticizer, and glass fiber. The present invention adjusts the conveyor belt components and introduces an elastomer flame retardant composite, which not only improves the mechanical properties of the conveyor belt, but also greatly improves the heat-resistant and flame-retardant properties of the conveyor belt. Therefore, the prepared conveyor belt can be used in high-temperature fields for a long time, thereby ensuring its service life in high-temperature fields.

Description

Technical Field

[0001] The invention belongs to the technical field of conveyor belts, in particular to a flame-retardant conveyor belt and a preparation process thereof. Background Art

[0002] Conveyor belts, also known as conveyor belts, are composite materials made of rubber, fiber, metal, or plastic and fabric that carry and transport materials within conveyor belts. They are widely used in industries such as cement, coking, metallurgy, chemical engineering, and steelmaking for short conveying distances and small volumes.

[0003] The materials transported by conveyor belts are generally divided into blocks, powders, pastes and piece items.

[0004] Conveyor belt materials generally include rubber conveyor belts and polymer conveyor belts. The former are mainly used in heavy industry and infrastructure construction, while the latter are mainly used in food processing and electronics.

[0005] Because it is used in heavy industry to transport high-temperature materials, and the transported high-temperature materials will produce thermal radiation effects on the conveyor belt, the flame retardant properties of conveyor belts made of existing materials are relatively general and cannot be used for high-temperature operations for a long time.

[0006] Based on this, a flame retardant conveyor belt and a preparation process thereof are provided to solve the existing technical problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a flame retardant conveyor belt and a preparation process thereof, so as to solve the deficiencies in the prior art.

[0008] The technical solution adopted in the present invention is as follows:

[0009] A flame-retardant conveyor belt comprises the following ingredients, measured by weight: 80-95 parts of styrene-butadiene rubber, 3-5 parts of white carbon black, 2-3 parts of sulfur, 15-20 parts of an elastomer flame-retardant composite, 20-25 parts of a composite filler, 1.5-1.8 parts of an antioxidant, 6-10 parts of natural rubber, 1-1.5 parts of stearic acid, 2-4 parts of a plasticizer, and 8-12 parts of glass fiber.

[0010] As a further technical solution: the preparation method of the elastomer flame retardant composite is:

[0011] (1) First, polytetramethylene ether glycol and 1,4-butanediol are dehydrated;

[0012] The dehydration temperature is 112°C and the dehydration treatment time is 40 minutes;

[0013] (2) Inert gas was introduced into the reactor, and the air in the reactor was exhausted. The dehydrated polytetramethylene ether glycol was added to the reactor, and the temperature was adjusted to 80° C. and kept warm for 10 minutes. Then, isophorone diisocyanate and melamine cyanurate were added, and stirred for 10 minutes. Then, dibutyltin dilaurate was added, and the reaction was kept warm for 3 hours.

[0014] Among them, the stirring speed is 150r / min;

[0015] (3) Continue to add 1,4-butanediol and stir the mixture for 2 hours;

[0016] Among them, the holding temperature is 80℃ and the stirring time is 200r / min;

[0017] (4) adding polyacrylic acid and magnesium hydroxide powder to N,N-dimethylformamide, stirring at room temperature for 30 minutes to obtain a mixed dispersion;

[0018] Among them, the holding temperature is 80 ° C and the stirring speed is 350 r / min;

[0019] The mixed dispersion is added to the reactor, and the mixture is stirred for 40-50 minutes at a stirring speed of 200 r / min. The mixture is then poured into a mold, dried, solidified, and then crushed to obtain an elastomer flame retardant composite.

[0020] The drying temperature is 100°C and the drying time is 30 minutes.

[0021] As a further technical solution: the inert gas in step (2) is nitrogen.

[0022] As a further technical solution: in the step (2), the molar ratio of polytetramethylene ether glycol, isophorone diisocyanate, melamine cyanurate, and dibutyltin dilaurate is 3:1:2;

[0023] The added amount of dibutyltin dilaurate is 2.5% of the mass of polytetramethylene ether glycol.

[0024] As a further technical solution: in step (3), the molar ratio of polytetrahydrofuran ether glycol to 1,4-butanediol is 1:1.

[0025] As a further technical solution: in step (4), the mixing ratio of polyacrylic acid, magnesium hydroxide powder, and N,N-dimethylformamide is 2-3 g:10 g:100 mL;

[0026] The mass ratio of the 1,4-butanediol to the mixed dispersion is 1:5.

[0027] As a further technical solution: the antioxidant is antioxidant CPPD.

[0028] As a further technical solution: the composite filler is made of a mixture of calcium carbonate, silicon carbide and zinc oxide;

[0029] The mixing mass ratio of the calcium carbonate, silicon carbide and zinc oxide is 10:1-2:3.

[0030] As a further technical solution: the plasticizer is dibutyl phthalate.

[0031] A preparation process for a flame-retardant conveyor belt comprises the following steps:

[0032] S1: First, add styrene-butadiene rubber, white carbon black, sulfur, elastomer flame retardant compound, composite filler, antioxidant, natural rubber, stearic acid, plasticizer, and glass fiber into a blender in sequence, and stir and mix for 20 minutes to obtain a uniform mixture;

[0033] The stirring temperature in the mixer is 60°C and the stirring speed is 1000r / min;

[0034] S2 mixing: mixing the mixed materials to obtain a mixed rubber material;

[0035] The mixing temperature is 155-160°C and the mixing time is 10-15 minutes;

[0036] S3 Blank Belt - Vulcanization - Stretching - Shaping: The mixed rubber material is made into a sheet, which is then hot-pressed into a blank belt, which is then vulcanized. The vulcanized blank belt is stretched to 1.3 times its original length and then cold-set to obtain a flame-retardant conveyor belt.

[0037] The vulcanization temperature is 140° C. and the vulcanization time is 25 minutes.

[0038] Beneficial effects:

[0039] The present invention adjusts the components of the conveyor belt and introduces an elastomer flame retardant composite, which not only improves the mechanical properties of the conveyor belt, but also greatly improves the heat resistance and flame retardancy of the conveyor belt. The prepared conveyor belt can be used in high-temperature fields for a long time, ensuring its service life in high-temperature fields.

[0040] The present invention introduces a composite filler, which is a mixture of calcium carbonate, silicon carbide and zinc oxide. By dispersing the composite filler in the conveyor belt system, the hardness and strength of the conveyor belt can be greatly improved, thereby significantly improving the wear resistance of the conveyor belt surface. In this way, the surface of the conveyor belt is less likely to be worn during transportation, while long-term wear will also cause the service life of the conveyor belt to be greatly reduced.

[0041] By introducing the elastomer flame retardant composite prepared by the present invention, it can play a role of network connection, connecting the rubber molecules and the filler particle components together respectively, thereby improving the uniform dispersion performance of each component in the rubber system of the conveyor belt, and greatly improving the overall performance of the conveyor belt. Secondly, since the elastomer flame retardant composite has a strong flame retardant performance improvement effect, the flame retardant grade of the conveyor belt produced reaches V-0 level, so that it can be better used for transportation in high-temperature fields.

[0042] The present invention adopts an elastomeric flame retardant composite to replace the conventional directly added inorganic flame retardant, thereby solving the problem of reduced mechanical properties of the rubber conveyor belt after the direct addition of the inorganic flame retardant. The elastomeric flame retardant composite prepared by the present invention has very good compatibility with styrene-butadiene rubber, and after blending, the mechanical properties of the rubber conveyor belt will not be reduced. At the same time, the excellent flame retardant properties of the rubber conveyor belt are also guaranteed.

[0043] The service life of the rubber conveyor belt prepared by the invention is 200% longer than that of a conventional pure styrene-butadiene rubber conveyor belt. DETAILED DESCRIPTION

[0044] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0045] Example 1

[0046] A preparation process for a flame-retardant conveyor belt comprises the following steps:

[0047] S1 prepares and mixes materials: first, mix 80 parts of styrene-butadiene rubber, 3 parts of white carbon black, 2 parts of sulfur, 15 parts of elastomer flame retardant compound, 20 parts of composite filler, 1.5 parts of antioxidant, 6 parts of natural rubber, 1 part of stearic acid, 2 parts of dibutyl phthalate, and 8 parts of glass fiber.

[0048] Add them into the blender in sequence and stir and mix for 20 minutes to obtain a uniform mixture;

[0049] The stirring temperature in the mixer is 60°C and the stirring speed is 1000r / min;

[0050] S2 mixing: mixing the mixed materials to obtain a mixed rubber material;

[0051] The mixing temperature is 155°C and the mixing time is 10 minutes;

[0052] S3 Blank Belt - Vulcanization - Stretching - Shaping: The mixed rubber material is made into a sheet, which is then hot-pressed into a blank belt, which is then vulcanized. The vulcanized blank belt is stretched to 1.3 times its original length and then cold-set to obtain a flame-retardant conveyor belt.

[0053] The vulcanization temperature is 140° C. and the vulcanization time is 25 minutes.

[0054] The preparation method of the elastomer flame retardant composite is as follows:

[0055] (1) First, polytetramethylene ether glycol and 1,4-butanediol are dehydrated;

[0056] The dehydration temperature is 112°C and the dehydration treatment time is 40 minutes;

[0057] (2) nitrogen was introduced into the reactor, and the air in the reactor was exhausted. The dehydrated polytetramethylene ether glycol was added into the reactor, and the temperature was adjusted to 80° C. and kept warm for 10 minutes. Then, isophorone diisocyanate and melamine cyanurate were added, and stirred for 10 minutes. Then, dibutyltin dilaurate was added, and the reaction was kept warm for 3 hours.

[0058] The stirring speed is 150 r / min; the molar ratio of polytetramethylene ether glycol, isophorone diisocyanate, melamine cyanurate, and dibutyltin dilaurate is 3:1:2;

[0059] The added amount of dibutyltin dilaurate is 2.5% of the mass of polytetramethylene ether glycol.

[0060] (3) Continue to add 1,4-butanediol and stir the mixture for 2 hours;

[0061] The holding temperature is 80° C., the stirring time is 200 r / min, and the molar ratio of polytetramethylene ether glycol to 1,4-butanediol is 1:1.

[0062] (4) adding polyacrylic acid and magnesium hydroxide powder to N,N-dimethylformamide, stirring at room temperature for 30 minutes to obtain a mixed dispersion;

[0063] Among them, the holding temperature is 80 ° C and the stirring speed is 350 r / min;

[0064] The mixed dispersion was added to the reactor, and the mixture was stirred for 40 minutes at a stirring speed of 200 r / min. The mixture was then poured into a mold, dried, solidified, and then crushed to obtain an elastomer flame retardant composite.

[0065] The drying temperature is 100°C and the drying time is 30 minutes. The mixing ratio of polyacrylic acid, magnesium hydroxide powder and N,N-dimethylformamide is 2g:10g:100mL respectively.

[0066] The mass ratio of the 1,4-butanediol to the mixed dispersion is 1:5.

[0067] The antioxidant is antioxidant CPPD.

[0068] The composite filler is a mixture of calcium carbonate, silicon carbide, and zinc oxide;

[0069] The mixing mass ratio of the calcium carbonate, silicon carbide and zinc oxide is 10:1:3.

[0070] After testing, the tensile strength is 25.5MPa.

[0071] Example 2

[0072] A preparation process for a flame-retardant conveyor belt comprises the following steps:

[0073] S1 prepares and mixes materials: first, mix 85 parts of styrene-butadiene rubber, 3.5 parts of white carbon black, 2.2 parts of sulfur, 16 parts of elastomer flame retardant compound, 21 parts of composite filler, 1.6 parts of antioxidant, 8 parts of natural rubber, 1.2 parts of stearic acid, 3 parts of dibutyl phthalate, and 9 parts of glass fiber.

[0074] Add them into the blender in sequence and stir and mix for 20 minutes to obtain a uniform mixture;

[0075] The stirring temperature in the mixer is 60°C and the stirring speed is 1000r / min;

[0076] S2 mixing: mixing the mixed materials to obtain a mixed rubber material;

[0077] The mixing temperature is 158°C and the mixing time is 12 minutes;

[0078] S3 Blank Belt - Vulcanization - Stretching - Shaping: The mixed rubber material is made into a sheet, which is then hot-pressed into a blank belt, which is then vulcanized. The vulcanized blank belt is stretched to 1.3 times its original length and then cold-set to obtain a flame-retardant conveyor belt.

[0079] The vulcanization temperature is 140° C. and the vulcanization time is 25 minutes.

[0080] The preparation method of the elastomer flame retardant composite is as follows:

[0081] (1) First, polytetramethylene ether glycol and 1,4-butanediol are dehydrated;

[0082] The dehydration temperature is 112°C and the dehydration treatment time is 40 minutes;

[0083] (2) nitrogen was introduced into the reactor, and the air in the reactor was exhausted. The dehydrated polytetramethylene ether glycol was added into the reactor, and the temperature was adjusted to 80° C. and kept warm for 10 minutes. Then, isophorone diisocyanate and melamine cyanurate were added, and stirred for 10 minutes. Then, dibutyltin dilaurate was added, and the reaction was kept warm for 3 hours.

[0084] The stirring speed is 150 r / min; the molar ratio of polytetramethylene ether glycol, isophorone diisocyanate, melamine cyanurate, and dibutyltin dilaurate is 3:1:2;

[0085] The added amount of dibutyltin dilaurate is 2.5% of the mass of polytetramethylene ether glycol.

[0086] (3) Continue to add 1,4-butanediol and stir the mixture for 2 hours;

[0087] The holding temperature is 80° C., the stirring time is 200 r / min, and the molar ratio of polytetramethylene ether glycol to 1,4-butanediol is 1:1.

[0088] (4) adding polyacrylic acid and magnesium hydroxide powder to N,N-dimethylformamide, stirring at room temperature for 30 minutes to obtain a mixed dispersion;

[0089] Among them, the holding temperature is 80 ° C and the stirring speed is 350 r / min;

[0090] The mixed dispersion was added to the reactor, and the mixture was stirred for 45 minutes at a stirring speed of 200 r / min. The mixture was then poured into a mold, dried, solidified, and then crushed to obtain an elastomer flame retardant composite.

[0091] The drying temperature is 100°C and the drying time is 30 minutes. The mixing ratio of polyacrylic acid, magnesium hydroxide powder and N,N-dimethylformamide is 2.5g:10g:100mL respectively.

[0092] The mass ratio of the 1,4-butanediol to the mixed dispersion is 1:5.

[0093] The antioxidant is antioxidant CPPD.

[0094] The composite filler is a mixture of calcium carbonate, silicon carbide, and zinc oxide;

[0095] The mixing mass ratio of the calcium carbonate, silicon carbide and zinc oxide is 10:1.2:3.

[0096] After testing, the tensile strength is 25.0MPa.

[0097] Example 3

[0098] A preparation process for a flame-retardant conveyor belt comprises the following steps:

[0099] S1 prepares and mixes materials: first, mix 88 parts of styrene-butadiene rubber, 4 parts of white carbon black, 2.5 parts of sulfur, 18 parts of elastomer flame retardant compound, 22 parts of composite filler, 1.6 parts of antioxidant, 8 parts of natural rubber, 1.2 parts of stearic acid, 3 parts of dibutyl phthalate, and 10 parts of glass fiber.

[0100] Add them into the blender in sequence and stir and mix for 20 minutes to obtain a uniform mixture;

[0101] The stirring temperature in the mixer is 60°C and the stirring speed is 1000r / min;

[0102] S2 mixing: mixing the mixed materials to obtain a mixed rubber material;

[0103] The mixing temperature is 158°C and the mixing time is 12 minutes;

[0104] S3 Blank Belt - Vulcanization - Stretching - Shaping: The mixed rubber material is made into a sheet, which is then hot-pressed into a blank belt, which is then vulcanized. The vulcanized blank belt is stretched to 1.3 times its original length and then cold-set to obtain a flame-retardant conveyor belt.

[0105] The vulcanization temperature is 140° C. and the vulcanization time is 25 minutes.

[0106] The preparation method of the elastomer flame retardant composite is as follows:

[0107] (1) First, polytetramethylene ether glycol and 1,4-butanediol are dehydrated;

[0108] The dehydration temperature is 112°C and the dehydration treatment time is 40 minutes;

[0109] (2) nitrogen was introduced into the reactor, and the air in the reactor was exhausted. The dehydrated polytetramethylene ether glycol was added into the reactor, and the temperature was adjusted to 80° C. and kept warm for 10 minutes. Then, isophorone diisocyanate and melamine cyanurate were added, and stirred for 10 minutes. Then, dibutyltin dilaurate was added, and the reaction was kept warm for 3 hours.

[0110] The stirring speed is 150 r / min; the molar ratio of polytetramethylene ether glycol, isophorone diisocyanate, melamine cyanurate, and dibutyltin dilaurate is 3:1:2;

[0111] The added amount of dibutyltin dilaurate is 2.5% of the mass of polytetramethylene ether glycol.

[0112] (3) Continue to add 1,4-butanediol and stir the mixture for 2 hours;

[0113] The holding temperature is 80° C., the stirring time is 200 r / min, and the molar ratio of polytetramethylene ether glycol to 1,4-butanediol is 1:1.

[0114] (4) adding polyacrylic acid and magnesium hydroxide powder to N,N-dimethylformamide, stirring at room temperature for 30 minutes to obtain a mixed dispersion;

[0115] Among them, the holding temperature is 80 ° C and the stirring speed is 350 r / min;

[0116] The mixed dispersion was added to the reactor, and the mixture was stirred for 45 minutes at a stirring speed of 200 r / min. The mixture was then poured into a mold, dried, solidified, and then crushed to obtain an elastomer flame retardant composite.

[0117] The drying temperature is 100°C and the drying time is 30 minutes. The mixing ratio of polyacrylic acid, magnesium hydroxide powder and N,N-dimethylformamide is 2.5g:10g:100mL respectively.

[0118] The mass ratio of the 1,4-butanediol to the mixed dispersion is 1:5.

[0119] The antioxidant is antioxidant CPPD.

[0120] The composite filler is a mixture of calcium carbonate, silicon carbide, and zinc oxide;

[0121] The mixing mass ratio of the calcium carbonate, silicon carbide and zinc oxide is 10:1.5:3.

[0122] After testing, the tensile strength is 25.8MPa.

[0123] Example 4

[0124] A preparation process for a flame-retardant conveyor belt comprises the following steps:

[0125] S1 prepares and mixes materials: first, 90 parts of styrene-butadiene rubber, 4 parts of white carbon black, 2.5 parts of sulfur, 18 parts of elastomer flame retardant compound, 24 parts of composite filler, 1.6 parts of antioxidant, 8 parts of natural rubber, 1.3 parts of stearic acid, 3 parts of dibutyl phthalate, and 10 parts of glass fiber.

[0126] Add them into the blender in sequence and stir and mix for 20 minutes to obtain a uniform mixture;

[0127] The stirring temperature in the mixer is 60°C and the stirring speed is 1000r / min;

[0128] S2 mixing: mixing the mixed materials to obtain a mixed rubber material;

[0129] The mixing temperature is 158°C and the mixing time is 14 minutes;

[0130] S3 Blank Belt - Vulcanization - Stretching - Shaping: The mixed rubber material is made into a sheet, which is then hot-pressed into a blank belt, which is then vulcanized. The vulcanized blank belt is stretched to 1.3 times its original length and then cold-set to obtain a flame-retardant conveyor belt.

[0131] The vulcanization temperature is 140° C. and the vulcanization time is 25 minutes.

[0132] The preparation method of the elastomer flame retardant composite is as follows:

[0133] (1) First, polytetramethylene ether glycol and 1,4-butanediol are dehydrated;

[0134] The dehydration temperature is 112°C and the dehydration treatment time is 40 minutes;

[0135] (2) nitrogen was introduced into the reactor, and the air in the reactor was exhausted. The dehydrated polytetramethylene ether glycol was added into the reactor, and the temperature was adjusted to 80° C. and kept warm for 10 minutes. Then, isophorone diisocyanate and melamine cyanurate were added, and stirred for 10 minutes. Then, dibutyltin dilaurate was added, and the reaction was kept warm for 3 hours.

[0136] The stirring speed is 150 r / min; the molar ratio of polytetramethylene ether glycol, isophorone diisocyanate, melamine cyanurate, and dibutyltin dilaurate is 3:1:2;

[0137] The added amount of dibutyltin dilaurate is 2.5% of the mass of polytetramethylene ether glycol.

[0138] (3) Continue to add 1,4-butanediol and stir the mixture for 2 hours;

[0139] The holding temperature is 80° C., the stirring time is 200 r / min, and the molar ratio of polytetramethylene ether glycol to 1,4-butanediol is 1:1.

[0140] (4) adding polyacrylic acid and magnesium hydroxide powder to N,N-dimethylformamide, stirring at room temperature for 30 minutes to obtain a mixed dispersion;

[0141] Among them, the holding temperature is 80 ° C and the stirring speed is 350 r / min;

[0142] The mixed dispersion was added to the reactor, and the mixture was stirred for 45 minutes at a stirring speed of 200 r / min. The mixture was then poured into a mold, dried, solidified, and then crushed to obtain an elastomer flame retardant composite.

[0143] The drying temperature is 100°C and the drying time is 30 minutes. The mixing ratio of polyacrylic acid, magnesium hydroxide powder and N,N-dimethylformamide is 2.2g:10g:100mL respectively.

[0144] The mass ratio of the 1,4-butanediol to the mixed dispersion is 1:5.

[0145] The antioxidant is antioxidant CPPD.

[0146] The composite filler is a mixture of calcium carbonate, silicon carbide, and zinc oxide;

[0147] The mixing mass ratio of the calcium carbonate, silicon carbide and zinc oxide is 10:1.5:3.

[0148] After testing, the tensile strength is 24.6MPa.

[0149] Example 5

[0150] A preparation process for a flame-retardant conveyor belt comprises the following steps:

[0151] S1: Prepare and mix the materials: first, mix 95 parts of styrene-butadiene rubber, 5 parts of white carbon black, 3 parts of sulfur, 20 parts of elastomer flame retardant compound, 25 parts of composite filler, 1.8 parts of antioxidant, 10 parts of natural rubber, 1.5 parts of stearic acid, 4 parts of dibutyl phthalate, and 12 parts of glass fiber.

[0152] Add them into the blender in sequence and stir and mix for 20 minutes to obtain a uniform mixture;

[0153] The stirring temperature in the mixer is 60°C and the stirring speed is 1000r / min;

[0154] S2 mixing: mixing the mixed materials to obtain a mixed rubber material;

[0155] The mixing temperature is 160°C and the mixing time is 15 minutes;

[0156] S3 Blank Belt - Vulcanization - Stretching - Shaping: The mixed rubber material is made into a sheet, which is then hot-pressed into a blank belt, which is then vulcanized. The vulcanized blank belt is stretched to 1.3 times its original length and then cold-set to obtain a flame-retardant conveyor belt.

[0157] The vulcanization temperature is 140° C. and the vulcanization time is 25 minutes.

[0158] The preparation method of the elastomer flame retardant composite is as follows:

[0159] (1) First, polytetramethylene ether glycol and 1,4-butanediol are dehydrated;

[0160] The dehydration temperature is 112°C and the dehydration treatment time is 40 minutes;

[0161] (2) nitrogen was introduced into the reactor, and the air in the reactor was exhausted. The dehydrated polytetramethylene ether glycol was added into the reactor, and the temperature was adjusted to 80° C. and kept warm for 10 minutes. Then, isophorone diisocyanate and melamine cyanurate were added, and stirred for 10 minutes. Then, dibutyltin dilaurate was added, and the reaction was kept warm for 3 hours.

[0162] The stirring speed is 150 r / min; the molar ratio of polytetramethylene ether glycol, isophorone diisocyanate, melamine cyanurate, and dibutyltin dilaurate is 3:1:2;

[0163] The added amount of dibutyltin dilaurate is 2.5% of the mass of polytetramethylene ether glycol.

[0164] (3) Continue to add 1,4-butanediol and stir the mixture for 2 hours;

[0165] The holding temperature is 80° C., the stirring time is 200 r / min, and the molar ratio of polytetramethylene ether glycol to 1,4-butanediol is 1:1.

[0166] (4) adding polyacrylic acid and magnesium hydroxide powder to N,N-dimethylformamide, stirring at room temperature for 30 minutes to obtain a mixed dispersion;

[0167] Among them, the holding temperature is 80 ° C and the stirring speed is 350 r / min;

[0168] The mixed dispersion was added to the reactor, and the mixture was stirred for 50 minutes at a stirring speed of 200 r / min. The mixture was then poured into a mold, dried, solidified, and then crushed to obtain an elastomer flame retardant composite.

[0169] The drying temperature is 100°C and the drying time is 30 minutes. The mixing ratio of polyacrylic acid, magnesium hydroxide powder and N,N-dimethylformamide is 3g:10g:100mL respectively.

[0170] The mass ratio of the 1,4-butanediol to the mixed dispersion is 1:5.

[0171] The antioxidant is antioxidant CPPD.

[0172] The composite filler is a mixture of calcium carbonate, silicon carbide, and zinc oxide;

[0173] The mixing mass ratio of the calcium carbonate, silicon carbide and zinc oxide is 10:2:3.

[0174] After testing, the tensile strength is 24.1MPa.

[0175] Comparative Example 1:

[0176] On the basis of Example 3, no elastomer flame retardant composite is added, and the rest of the technical solutions are the same as those in Example 3.

[0177] After testing, the tensile strength is 15.7MPa.

[0178] Comparative Example 2:

[0179] On the basis of Example 3, melamine cyanurate is not added during the preparation of the elastomer flame retardant composite, and the rest of the technical solutions are the same as those in Example 3.

[0180] test:

[0181] Acid resistance test

[0182] The performance of the examples and comparative examples was tested:

[0183] Taking HG / T3782-2005 as the testing standard:

[0184] Level 1: No corrosion within 1 hour;

[0185] Level 2: Corrosion begins after 40 minutes;

[0186] Level 3: Corrosion begins within 20-40 minutes;

[0187] Level 4: Corrosion begins within 0-20 minutes;

[0188] Table 1

[0189] Acid resistance / grade Example 1 1 Example 2 1 Example 3 1 Example 4 1 Example 5 1 Comparative Example 1 2 Comparative Example 2 2

[0190] It can be seen from Table 1 that the flame retardant conveyor belt prepared by the present invention has excellent corrosion resistance.

[0191] The test standard adopts GB / T33510-2017 heat resistance sum test method of heat-resistant rubber cover conveyor belt cover, and tests are performed on the example and comparative example samples:

[0192] Table 2

[0193] Burning depth (mm) Example 1 0.12 Example 2 0.12 Example 3 0.10 Example 4 0.11 Example 5 0.12 Comparative Example 1 0.36 Comparative Example 2 0.20

[0194] It can be seen from Table 2 that the flame retardant conveyor belt prepared by the present invention has excellent surface heat resistance.

[0195] Flame retardancy: tested according to the method specified in UL94:

[0196] Table 3

[0197] flame retardancy Example 1 V-0 Example 2 V-0 Example 3 V-0 Example 4 V-0 Example 5 V-0

[0198] It can be seen from Table 3 that the conveyor belt of the present invention has excellent flame retardant properties.

[0199] The above description is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to the embodiment shown. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description, should be within the scope of protection of the present invention.

Claims

1. A flame retardant conveyor belt, characterized in that: The composition includes the following ingredients by weight: 80-95 parts of styrene-butadiene rubber, 3-5 parts of white carbon black, 2-3 parts of sulfur, 15-20 parts of elastomer flame retardant compound, 20-25 parts of composite filler, 1.5-1.8 parts of antioxidant, 6-10 parts of natural rubber, 1-1.5 parts of stearic acid, 2-4 parts of plasticizer, and 8-12 parts of glass fiber; The preparation method of the elastomer flame retardant composite is as follows: (1) First, polytetramethylene ether glycol and 1,4-butanediol are dehydrated; The dehydration temperature is 112°C and the dehydration treatment time is 40 minutes; (2) introducing an inert gas into the reactor, exhausting the air in the reactor, adding the dehydrated polytetramethylene ether glycol into the reactor, adjusting the temperature to 80° C., and keeping the temperature for 10 minutes, then adding isophorone diisocyanate and melamine cyanurate, stirring for 10 minutes, and then adding dibutyltin dilaurate, and keeping the temperature for reaction for 3 hours; wherein the mixing molar ratio of the polytetramethylene ether glycol, isophorone diisocyanate, and melamine cyanurate is 3:1:2; the amount of dibutyltin dilaurate added is 2.5% of the mass of the polytetramethylene ether glycol; and the stirring speed is 150 r / min; (3) Continue to add 1,4-butanediol, keep warm and stir for 2 hours; wherein, the molar ratio of polytetramethylene glycol to 1,4-butanediol is 1:1; the insulation temperature is 80°C, and the stirring time is 200 r / min; (4) adding polyacrylic acid and magnesium hydroxide powder to N,N-dimethylformamide, stirring at room temperature for 30 minutes to obtain a mixed dispersion; The mixing ratio of the polyacrylic acid, magnesium hydroxide powder, and N,N-dimethylformamide is 2-3 g:10 g:100 mL; the mass ratio of 1,4-butanediol to the mixed dispersion is 1:5; the holding temperature is 80°C, and the stirring speed is 350 r / min; The mixed dispersion is added to the reactor, and the mixture is stirred for 40-50 minutes at a stirring speed of 200 r / min. The mixture is then poured into a mold, dried, solidified, and then crushed to obtain an elastomer flame retardant composite. The drying temperature is 100°C and the drying time is 30 minutes.

2. A flame-retardant conveyor belt according to claim 1, characterized in that: The inert gas in step (2) is nitrogen.

3. The flame-retardant conveyor belt according to claim 1, characterized in that: The antioxidant is antioxidant CPPD.

4. The flame-retardant conveyor belt according to claim 1, characterized in that: The composite filler is made of a mixture of calcium carbonate, silicon carbide and zinc oxide; The mixing mass ratio of the calcium carbonate, silicon carbide and zinc oxide is 10:1-2:

3.

5. The flame-retardant conveyor belt according to claim 1, characterized in that: The plasticizer is dibutyl phthalate.

6. The process for preparing a flame-retardant conveyor belt according to claim 1, characterized in that: The following steps are involved: S1: First, add styrene-butadiene rubber, white carbon black, sulfur, elastomer flame retardant compound, composite filler, antioxidant, natural rubber, stearic acid, plasticizer, and glass fiber into a blender in sequence, and stir and mix for 20 minutes to obtain a uniform mixture; The stirring temperature in the mixer is 60°C and the stirring speed is 1000 r / min; S2 mixing: mixing the mixed materials to obtain a mixed rubber material; The mixing temperature is 155-160°C and the mixing time is 10-15 minutes; S3 Blank Belt - Vulcanization - Stretching - Shaping: The mixed rubber material is made into a sheet, which is then hot-pressed into a blank belt, which is then vulcanized. The vulcanized blank belt is stretched to 1.3 times its original length and then cold-set to obtain a flame-retardant conveyor belt. The vulcanization temperature is 140° C. and the vulcanization time is 25 minutes.