Energy-saving and environment-friendly polyarylate fabric core-integrated flame-retardant conveyor belt and manufacturing method thereof

Abstract

The application discloses an energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveying belt and a manufacturing method thereof. The polyarylate fabric whole-core flame-retardant conveying belt comprises a polyarylate fabric whole belt core, a covering layer and a belt core impregnated sizing material. The covering layer comprises the following components: solution polymerized styrene-butadiene rubber, styrene-butadiene-styrene block copolymer, thermoplastic polyurethane elastomer, zinc oxide, stearic acid, sulfur, accelerator, antioxidant, carbon black, hybrid flame-retardant composite material, phosphate flame retardant, paraffin oil and antistatic agent. The covering layer of the energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveying belt is prepared by selecting white carbon black, expanded graphite, aluminum diethyl hypophosphite and zinc dimethyl imidazole composite, carrying out surface treatment on the white carbon black, expanded graphite, aluminum diethyl hypophosphite and zinc dimethyl imidazole composite through polyacrylamide, and then carrying out macromolecular modification on the hybrid flame-retardant composite material through styrene-butadiene-styrene block copolymer. The prepared conveying belt has excellent flame-retardant antistatic performance, environment-friendly performance, low rolling resistance performance and mechanical performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of conveying belt, and particularly relates to an energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveying belt and a manufacturing method thereof. BACKGROUND

[0002] The fabric whole-core flame-retardant conveying belt for coal mine is a main tool for coal transportation in underground coal mine, and the annual demand in China is about 25 million meters. At present, the fabric whole-core flame-retardant conveying belt for underground coal mine in China has the following outstanding problems: first, the product grade is low, mainly manifested in low strength, generally below 2500 N / mm, thin covering layer, generally below 3 mm, short service life, and serious resource waste. In general, the fabric whole-core flame-retardant conveying belt with a full-thickness tensile strength below 2500 N / mm, the steel wire rope core flame-retardant conveying belt or aramid fabric core flame-retardant conveying belt with a full-thickness tensile strength of 2500 N / mm-4000 N / mm, and the steel wire rope core flame-retardant conveying belt with a full-thickness tensile strength above 4000 N / mm are selected; second, polyvinyl chloride and halogen and antimony-containing flame retardants are used as main raw materials, which not only causes serious pollution in the production process, but also produces a large amount of smoke and toxic smoke gas when ignited, which can endanger personnel life, corrode equipment, pollute the environment, and cause very serious secondary disasters, and seriously threaten the life of miners and safety production.

[0003] Patent CN107216560A discloses an aramid fabric whole-core flame-retardant conveying belt and a manufacturing method thereof. The covering layer adopts PVC / CM / TPU blended hot plastic elastomer, which has good flame-retardant performance, high tensile strength, excellent elasticity, good wear resistance, and high adhesive strength with the whole belt core after plasticizing. The strength of the fabric core flame-retardant belt is increased to 4500 N / mm, the belt body is thin and light compared with the steel wire rope core flame-retardant conveying belt with the same strength, and the energy consumption of the conveyor can be reduced. However, the aramid fiber has high price and poor bending fatigue resistance, the strength decays quickly during use, the melting point is higher than the ignition point of coal, the cost is high when used for conveying coal in underground coal mine, the strength loss is large, and there is a certain safety risk. Moreover, the aramid fabric core flame-retardant conveying belt of MT / T914 standard can only use vulcanized joints, which has complex operation and long construction time. When used as a crossheading belt, the production will be affected due to frequent joints. SUMMARY

[0004] The present application aims to meet the needs of safety, economy, and high-strength transportation for coal transportation in underground coal mine, and provides an energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveying belt.

[0005] The second purpose of the present application is to provide a manufacturing method of the energy-saving and environment-friendly high-strength polyarylate fabric whole-core flame-retardant conveying belt, which has simple manufacturing method, low energy consumption, and high production efficiency.

[0006] The object of the application can be achieved by the following technical solutions.

[0007] The energy-saving and environment-friendly polyarylate fabric whole core flame-retardant conveyor belt comprises a polyarylate fabric whole belt core, a cover layer and a belt core impregnated sizing material.

[0008] The cover layer comprises the following components in parts by mass:

[0009] 40-60 parts of solution polymerized styrene-butadiene rubber (SSBR), 20-30 parts of styrene-butadiene-styrene block copolymer (SBS), 20-30 parts of thermoplastic polyurethane elastomer (TPU), 2-4 parts of zinc oxide, 1-2 parts of stearic acid, 1.6-2 parts of sulfur, 1.6-2 parts of accelerator, 1.6-2 parts of antioxidant, 18-22 parts of carbon black, 60-70 parts of hybrid flame-retardant composite material, 20-30 parts of phosphate ester flame retardant, 8-12 parts of paraffin oil and 2-4 parts of antistatic agent.

[0010] The phosphate ester flame retardant is any one of toluene diphenyl phosphate, diphenyl phosphate and trioctyl phosphate.

[0011] Further, the polyarylate fabric whole belt core is a 4-5 layer whole weaving structure composed of liquid crystal polyarylate fiber, nylon fiber and cotton fiber, and the width is 104-106% of the belt width.

[0012] Further, the warp stress line of the polyarylate fabric whole belt core is formed by plying 1000D or 1500D high-strength liquid crystal polyarylate fiber, and the single tensile strength after plying is 1500-3500N, and the density is 184-279 roots / 10cm.

[0013] Further, the weft stress line of the polyarylate fabric whole belt core is formed by plying 1000D or 1500D nylon fiber and cotton fiber, and the single tensile strength after plying is 450-1250N / root, and the density is 124-160 roots / 10cm.

[0014] Further, the upper and lower two layers of warp of the polyarylate fabric whole belt core are cotton fiber, and the middle 2-3 layers of warp are liquid crystal polyarylate fiber, the cotton content of the belt core warp is 15-25%, and the cotton content of the belt core weft is 35-45%.

[0015] Further, the accelerator is accelerator M, accelerator DM and accelerator TMTD mixed in any ratio; and the antioxidant is antioxidant RD and 4020 mixed in any ratio.

[0016] Further, the belt core impregnated sizing material comprises the following components in parts by mass:

[0017] 100-120 parts of polyvinyl chloride paste resin (EPVC), 40-60 parts of environmentally friendly plasticizer, 10-20 parts of epoxy soybean oil, 8-12 parts of liquid butyl rubber, 20-40 parts of phosphate ester flame retardant, 1-2 parts of imidazole phosphate ionic liquid flame retardant (PIL), 12-16 parts of intumescent flame retardant, and 3-5 parts of calcium-zinc composite stabilizer.

[0018] Further, the core impregnated sizing is prepared by the following steps:

[0019] The polyvinyl chloride paste resin, the environmentally friendly plasticizer, the epoxy soybean oil, the liquid butyl rubber, the phosphate ester flame retardant, the imidazole phosphate ionic liquid flame retardant, the intumescent flame retardant, and the calcium-zinc composite stabilizer are sequentially added into a high-speed dispersion machine for stirring, and then are ground by a three-roll grinder and defoamed by a vacuum defoaming machine to obtain the core impregnated sizing.

[0020] Further, the imidazole phosphate ionic liquid flame retardant is any one of 1-ethyl-3-methylimidazole dimethyl phosphate, 1-ethyl-3-methylimidazole diethyl phosphate, and 1-butyl-3-methylimidazole dibutyl phosphate; and the intumescent flame retardant is any one of ammonium polyphosphate, melamine polyphosphate, and melamine cyanurate.

[0021] Further, the covering layer is prepared by the following steps:

[0022] The hybrid flame-retardant masterbatch, the solution-polymerized styrene-butadiene rubber, the thermoplastic polyurethane elastomer, the zinc oxide, the stearic acid, the sulfur, the accelerator, the antioxidant, the carbon black, the phosphate ester flame retardant, the paraffin oil, and the antistatic agent are added into a Banbury mixer at 40-60 rpm for mixing, and are dynamically vulcanized at a temperature of 167-175 ℃ for 3-4 min, and then are dynamically vulcanized by a twin-screw extruder at a temperature of 175-180 ℃ for 5-6 min at a speed of 50-70 rpm, and are granulated and cooled to obtain the covering layer.

[0023] Further, the hybrid flame-retardant masterbatch is prepared by the following steps:

[0024] The hybrid flame-retardant composite material is added into a Banbury mixer at 20-40 rpm, heated to 70-80 ℃, and then blended with styrene-butadiene-styrene block copolymer for 180-200 s at a discharge temperature of 165-175 ℃, and is discharged and cooled to stand for 8-10 h to obtain the hybrid flame-retardant masterbatch.

[0025] Further, the hybrid flame-retardant composite material is prepared by the following steps:

[0026] The white carbon black, expanded graphite, aluminum diethyl hypophosphite and zinc dimethyl imidazole are put into a kneader, heated and stirred, the stirring speed is 350-400 rpm, heated to 40-60 DEG C, start to spray 2-3 wt% polyacrylamide aqueous solution, continue to heat and stir, stir for 10-15 min at 105-110 DEG C, after cooling, the hybrid flame-retardant composite material is obtained.

[0027] Further, the mass ratio of the white carbon black, expanded graphite, aluminum diethyl hypophosphite, zinc dimethyl imidazole and polyacrylamide aqueous solution is 30-35:30-35:20-25:1-2:4-5.

[0028] The manufacturing method of the energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt comprises the following steps:

[0029] Step one, the polyarylate fabric whole belt core is dipped through the dipping tank full of the belt core impregnated sizing material and the vacuum box, and the dipped polyarylate fabric whole belt core is put into the plasticizing tank at 160-175 DEG C to be plasticized, the plasticizing speed is 0.6-1.2 m / min, and the plasticized belt core is obtained.

[0030] Step two, the covering layer granular material is dynamically vulcanized through two extruders and a mold, the rotating speed of the extruder is 30-50 rpm, the temperature of the extruder and the mold is 160-175 DEG C, the plasticized belt core is directly pasted together with the plasticized belt core in the hot state, the surface temperature of the plasticized belt core is 145-165 DEG C, the thickness of the covering layer is 6-8 mm, and the energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt is obtained.

[0031] The polyarylate fabric whole-core flame-retardant conveyor belt has the advantages that:

[0032] (1) The covering layer of the energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt is composed of white carbon black, expanded graphite, aluminum diethyl hypophosphite and zinc dimethyl imidazole, is treated on the surface by polyacrylamide, and is macromolecularly modified by styrene-butadiene-styrene block copolymer, so that the conveyor belt has excellent flame-retardant antistatic performance, environment-friendly performance, low rolling resistance performance and mechanical properties.

[0033] (2) The polyarylate fiber is adopted in the radial stress line of the polyarylate fabric whole belt core of the energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt, the strength is high, the belt body is thin, the weight is light, the weight of the finished belt is about 50% of that of the steel wire rope core conveyor belt with the same strength, and the energy consumption in the running process of the conveyor belt is greatly reduced; compared with the aramid fabric flame-retardant conveyor belt with the same strength, the polyarylate has lower price, better bending fatigue resistance and lower melting point than the coal ignition point, so the safety and economic performance is better.

[0034] (3) The energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt cover layer prepared by the present application effectively improves the flame-retardant performance of the cover layer by adding dimethyl imidazole zinc, on the one hand, effectively reduces the toxic gas emission; on the other hand, makes the cover layer form a relatively dense carbon layer, promotes carbonization to isolate heat and oxygen, and improves the flame-retardant safety; in addition, the addition of dimethyl imidazole zinc also prevents the agglomeration of white carbon black and other additives, improves the compatibility and dispersibility between the additives and the cover layer, and improves the thermal stability, electrical conductivity, low rolling resistance and other mechanical properties of the cover layer in addition to improving the flame-retardant performance of the cover layer.

[0035] (4) The energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt prepared by the present application can reduce the emission of VOCs during modification and subsequent processing by using polyacrylamide instead of silane coupling agent for modification treatment of the hybrid flame-retardant composite material, which is beneficial to environmental protection, and at the same time improves the dispersity of the hybrid flame-retardant composite material, Payne effect is weakened, at the same time, the processing temperature of the cover layer is reduced, the dynamic vulcanization time is shortened, and the flame-retardant antistatic performance, low rolling resistance and other mechanical properties are improved.

[0036] (5) The present application has a synergistic effect by forming a halogen-free flame-retardant system with the hybrid flame-retardant composite material and phosphate flame retardant, which can simultaneously improve the flame-retardant antistatic performance, low rolling resistance and other mechanical properties of the cover layer, at the same time, the macromolecular modification of the hybrid flame-retardant composite material by styrene-butadiene-styrene block copolymer can effectively coat the hybrid flame-retardant composite material, improve the flame-retardant antistatic performance, and at the same time, improve the wear resistance of the cover layer and effectively reduce the rolling resistance of the cover layer.

[0037] (6) The belt core impregnated rubber of the present application uses liquid nitrile rubber to partially replace PVC paste resin, reduces the halogen content of the rubber, reduces the toxicity of the rubber, and increases the adhesion strength between the cover layer and the whole belt core of the polyarylate fabric and the internal adhesion strength of the belt core; the use of environmentally friendly plasticizer and epoxy soybean oil instead of traditional dioctyl phthalate plasticizer reduces the amount of VOCs generated during production, which is beneficial to environmental protection.

[0038] (7) The present application can be vulcanized joint or mechanical joint, mechanical joint can be quickly installed or replaced conveyor belt, reduce downtime; adopt vacuum impregnation whole belt core, hot oil carrier heating plasticization, extruder veneer forming and dynamic vulcanization process, realize the continuous production of conveyor belt, compared with the production process of steel wire rope core flame-retardant conveyor belt and aramid fabric core flame-retardant conveyor belt, save energy consumption, improve production efficiency, simple process, easy to manufacture. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0040] Embodiment 1: An energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising a polyarylate fabric whole belt core, a cover layer and a belt core impregnated sizing material.

[0041] The polyarylate fabric whole belt core is a 4-layer whole weaving structure composed of liquid crystal polyarylate (LCP) fibers, nylon fibers and cotton fibers, with a width of 1272 mm; the warp stress line of the belt core is made of LCP fibers, which are stranded from 1000D high-strength LCP fibers, and the single tensile strength of the stranded LCP fibers is 1500N, and the density is 184 roots / 10 cm; the upper and lower two layers of warp of the belt core are cotton fibers, and the middle two layers of warp are LCP fibers, and the cotton content of the warp of the belt core is 25%; the weft stress line of the belt core is made of nylon fibers, and the weft is stranded from 1000D nylon fibers and cotton fibers, and the single tensile strength of the weft after stranding is 450N / root, and the density is 160 roots / 10 cm; the cotton content of the weft of the belt core is 45%.

[0042] A manufacturing method of an energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising the following steps:

[0043] S1, put 30 kg of white carbon black, 30 kg of expanded graphite, 20 kg of diethyl aluminum hypophosphite and 1 kg of zinc dimethyl imidazole into a kneader for heating and stirring, the stirring speed is 350 rpm, heat to 40℃, start to spray 4 kg of polyacrylamide aqueous solution with a concentration of 2wt%, continue to heat and stir, stir at a temperature of 105℃ for 10 min, and obtain a hybrid flame-retardant composite material after cooling.

[0044] S2, add 60 kg of hybrid flame-retardant composite material into a 20 rpm banbury mixer, heat to 70℃, then add 20 kg of styrene-butadiene-styrene block copolymer and blend for 180 s, the discharge temperature is 165℃, sheet out, cool and stop for 8 h to obtain a hybrid flame-retardant masterbatch.

[0045] S3, the hybrid flame-retardant master batch prepared in S2, 40 kg of solution-polymerized styrene-butadiene rubber, 20 kg of thermoplastic polyurethane elastomer, 2 kg of zinc oxide, 1 kg of stearic acid, 1.6 kg of sulfur, 0.48 kg of accelerator M, 0.48 kg of accelerator DM, 0.64 kg of accelerator TMTD, 0.6 kg of antioxidant RD, 1 kg of antioxidant 4020, 18 kg of carbon black, 20 kg of toluene diphenyl phosphate, 8 kg of paraffin oil, and 2 kg of antistatic agent are added to a Banbury mixer and mixed at 40 rpm, dynamically vulcanized at a temperature of 167 ℃ for 3 min, then dynamically vulcanized at a temperature of 175 ℃ for 5 min through a double-screw extruder at 50 rpm, pelletized, and cooled to obtain the cover layer.

[0046] S4, 100 kg of polyvinyl chloride paste resin, 40 kg of environmentally friendly plasticizer, 10 kg of epoxy soybean oil, 8 kg of liquid butyl nitrile rubber, 20 kg of toluene diphenyl phosphate, 1 kg of 1-butyl-3-methylimidazole dibutyl phosphate, 12 kg of ammonium polyphosphate, and 3 kg of calcium-zinc composite stabilizer are sequentially added to a high-speed disperser and stirred at 2500 rpm for 20 min, and then the paste is obtained after the viscosity reaches 4000 Pa.s. The paste is ground three times through a three-roll grinder with a roll distance of 0.15 mm and a speed of 500 rpm, and then degassed through a vacuum degassing machine at a vacuum degree of -0.05 Mpa at room temperature for 20 min to obtain a core impregnated glue.

[0047] S5, the polyarylate fabric whole core is driven by a traction machine to pass through an impregnation tank and a vacuum box filled with the core impregnated glue at a speed of 0.6 m / min, and the vacuum degree is -0.05 Mpa. The impregnated polyarylate fabric whole core enters a plasticizing tank at 160 ℃ for plasticizing at a plasticizing speed of 0.6 m / min to obtain a plasticized core.

[0048] S6, the cover layer granules are dynamically vulcanized through two extruders and a mold at a speed of 30 rpm, and the extruder and mold temperature is 160 ℃. In order to directly adhere to the plasticized core in a hot state, the surface temperature of the plasticized core is 145 ℃, and the thickness of the cover layer is 6 mm, to obtain an energy-saving and environmentally friendly polyarylate fabric whole-core flame-retardant conveyor belt.

[0049] Example 2: An energy-saving and environmentally friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising a polyarylate fabric whole core, a cover layer, and a core impregnated glue.

[0050] The polyarylate fabric whole core is a 4-layer whole weaving structure composed of liquid crystal polyarylate (LCP) fiber, nylon fiber and cotton fiber, and the width is 1272 mm; the LCP fiber is used for the warp stress line of the core, and the LCP fiber is stranded by 1000D high-strength LCP fiber, and the single tensile strength of the stranded single fiber is 1500N, and the density is 187 roots / 10 cm; the upper and lower two layers of warp of the core are cotton fiber, and the middle two layers of warp are LCP fiber, and the cotton content of the warp of the core is 23%; the nylon fiber is used for the weft stress line of the core, and the weft is stranded by 1000D nylon fiber and cotton fiber, and the single tensile strength of the weft after stranding is 600N / root, and the density is 150 roots / 10 cm; the cotton content of the weft of the core is 43%.

[0051] A manufacturing method of an energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising the following steps:

[0052] S1, put 31 kg of white carbon black, 31 kg of expanded graphite, 21 kg of diethyl aluminum hypophosphite and 1.2 kg of zinc dimethyl imidazole into a kneader for heating and stirring, the stirring speed is 350 rpm, heat to 40℃, start spraying 4.2 kg of polyacrylamide aqueous solution with a concentration of 2.2wt%, continue heating and stirring, stir for 10 min at a temperature of 105℃, and get a hybrid flame-retardant composite material after cooling.

[0053] S2, add 68 kg of hybrid flame-retardant composite material into a 20 rpm banbury mixer, heat to 70℃, then add 28 kg of styrene-butadiene-styrene block copolymer and blend for 180 s, the glue discharge temperature is 165℃, sheet out, cool and stop for 8 h to get a hybrid flame-retardant masterbatch.

[0054] S3, add the hybrid flame-retardant masterbatch prepared in S2, 45 kg of solution styrene-butadiene rubber, 27 kg of thermoplastic polyurethane elastomer, 2.5 kg of zinc oxide, 1.3 kg of stearic acid, 1.7 kg of sulfur, 0.6 kg of accelerator M, 0.6 kg of accelerator DM, 0.5 kg of accelerator TMTD, 0.8 kg of antioxidant RD, 1 kg of antioxidant 4020, 19 kg of carbon black, 22 kg of diphenyl phosphate, 11 kg of paraffin oil and 3.5 kg of antistatic agent into the banbury mixer at 40 rpm, dynamically vulcanize for 3 min at a temperature of 167℃, then pass through the double screw extruder at 50 rpm and dynamically vulcanize for 5 min at a temperature of 175℃, granulate and cool to get the cover layer.

[0055] S4, 105 kg of polyvinyl chloride paste resin, 45 kg of environmentally friendly plasticizer, 12.5 kg of epoxy soybean oil, 9 kg of liquid butyl nitrile rubber, 25 kg of methyl phenyl diphenyl phosphate, 1.25 kg of 1-ethyl-3-methyl imidazole dimethyl phosphate, 13 kg of melamine polyphosphate, and 3.5 kg of calcium-zinc composite stabilizer are sequentially added to a high-speed dispersion machine and stirred at 2500 rpm for 20 min. After the viscosity is 4000 Pa.s, a paste is obtained. The paste is ground through a three-roll grinder three times, the roll distance of the grinder is 0.15 mm, and the speed is 500 rpm. Then, the paste is degassed through a vacuum degassing machine. The vacuum degree is -0.05 Mpa, and the degassing is performed at room temperature for 20 min. A core impregnated rubber compound is obtained.

[0056] S5, the polyarylate fabric whole core is driven by a traction machine to pass through an impregnation pool and a vacuum box filled with the core impregnated rubber compound at a speed of 0.6 m / min, and the vacuum degree is -0.05 Mpa. The impregnated polyarylate fabric whole core enters a plasticizing box at 160℃, and the plasticizing speed is 0.6 m / min. A plasticized core is obtained.

[0057] S6, the covering layer granular material is dynamically vulcanized through two extruders and a mold. The speed of the extruders is 30 rpm, and the temperature of the extruders and the mold is 160℃. In order to directly adhere together with the plasticized core in a hot state, the surface temperature of the plasticized core is 145℃, and the thickness of the covering layer is 6 mm. An energy-saving and environmentally friendly polyarylate fabric whole-core flame-retardant conveyor belt is obtained.

[0058] Example 3: An energy-saving and environmentally friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising a polyarylate fabric whole core, a covering layer, and a core impregnated rubber compound.

[0059] The polyarylate fabric whole core is a 5-layer whole weaving structure composed of LCP fibers, nylon fibers, and cotton fibers, and the width is 1400 mm. The core warp stress line is made of 1500D high-strength LCP fibers, and the single tensile strength of the stranded line is 2500 N, and the density is 220 roots / 10 cm. The upper and lower two layers of the core warp are cotton fibers, the middle three layers of the core warp are LCP fibers, and the core warp contains 20% cotton. The core weft stress line is made of 1500D nylon fibers and cotton fibers, and the single tensile strength of the weft line after stranding is 850 N / root, and the density is 142 roots / 10 cm. The core weft contains 38% cotton.

[0060] A manufacturing method of an energy-saving and environmentally friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising the following steps:

[0061] S1, put 32.5 kg of white carbon black, 32.5 kg of expanded graphite, 22.5 kg of aluminum diethyl hypophosphite and 1.5 kg of zinc dimethyl imidazole into the kneader for heating and stirring, the stirring speed is 370 rpm, heat to 50℃, start to spray 4.5 kg of 2.5wt% polyacrylamide aqueous solution, continue to heat and stir, stir for 12.5 min at 107℃, after cooling, get the hybrid flame retardant composite material.

[0062] S2, put 65 kg of hybrid flame retardant composite material into the internal mixer at 30 rpm, heat to 75℃, then add 25 kg of styrene-butadiene-styrene block copolymer and blend for 190 s, the discharge temperature is 170℃, sheeting, cooling and parking for 9 h to get the hybrid flame retardant masterbatch.

[0063] S3, put the hybrid flame retardant masterbatch prepared in S2, 50 kg of solution styrene-butadiene rubber, 25 kg of thermoplastic polyurethane elastomer, 3 kg of zinc oxide, 1.5 kg of stearic acid, 1.8 kg of sulfur, 0.5 kg of accelerator M, 0.6 kg of accelerator DM, 0.7 kg of accelerator TMTD, 0.9 kg of antioxidant RD, 0.9 kg of antioxidant 4020, 20 kg of carbon black, 25 kg of trioctyl phosphate, 10 kg of paraffin oil and 3 kg of antistatic agent into the internal mixer at 50 rpm, mix, dynamically vulcanize at 170℃ for 3.5 min, then pass through the double screw extruder at 60 rpm, dynamically vulcanize at 177℃ for 5.5 min, granulate, cool, get the cover layer.

[0064] S4, put 110 kg of polyvinyl chloride paste resin, 50 kg of environmentally friendly plasticizer, 15 kg of epoxy soybean oil, 10 kg of liquid butyl nitrile rubber, 30 kg of diphenyl phosphate, 1.5 kg of 1-ethyl-3-methyl imidazole dimethyl phosphate, 14 kg of melamine polyphosphate and 4 kg of calcium-zinc composite stabilizer into the high-speed disperser at 2700 rpm and stir for 25 min, get the paste when the viscosity is 5000 Pa.s, pass the paste through the three-roll mill for grinding three times, the roll distance of the mill is 0.2 mm, the speed is 650 rpm, then pass through the vacuum degassing machine for degassing, degassing at room temperature for 25 min under the vacuum degree of-0.07 Mpa, get the core impregnated sizing material.

[0065] S5, put the whole polyarylate fabric core into the impregnation tank and vacuum box filled with the core impregnated sizing material under the traction of the traction machine at a speed of 0.9 m / min, the vacuum degree is-0.07 Mpa, put the impregnated polyarylate fabric core into the plasticizing tank at 170℃ for plasticizing, the plasticizing speed is 0.9 m / min, get the plasticized core.

[0066] S6, dynamically vulcanizing the covering layer granular material through two extruders and a die, the rotation speed of the extruders is 40 rpm, the temperature of the extruders and the die is 170℃, directly bonding together with the plasticized tape core in a hot state, the surface temperature of the plasticized tape core is 155℃, the thickness of the covering layer is 7mm, to obtain the energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt.

[0067] Example 4: An energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising a polyarylate fabric whole belt core, a covering layer and a belt core impregnated sizing material.

[0068] The polyarylate fabric whole belt core is a 5-layer whole weaving structure composed of LCP fibers, nylon fibers and cotton fibers, and the width is 1462mm; the warp stress line of the belt core is composed of 1500D high-strength LCP fibers, and the single tensile strength of the stranded LCP fibers is 3000N, and the density is 231 strands / 10cm; the upper and lower two layers of warp of the belt core are cotton fibers, and the middle three layers of warp are LCP fibers, and the cotton content of the warp of the belt core is 17%; the weft stress line of the belt core is composed of nylon fibers, and the weft is composed of 1500D nylon fibers and cotton fibers, and the single tensile strength of the weft after stranding is 1050N / strand, and the density is 133 strands / 10cm; the cotton content of the weft of the belt core is 36%.

[0069] A manufacturing method of an energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising the following steps:

[0070] S1, put 35kg of white carbon black, 35kg of expanded graphite, 25kg of diethyl aluminum hypophosphite and 2kg of zinc dimethyl imidazole into a kneader and heat and stir, the stirring speed is 400rpm, heat to 60℃, start spraying 5kg of polyacrylamide aqueous solution with a concentration of 3wt%, continue heating and stirring, stir at a temperature of 110℃ for 15min, cool to obtain a hybrid flame-retardant composite material.

[0071] S2, add 70kg of hybrid flame-retardant composite material to a 40rpm internal mixer, heat to 80℃, then add 23kg of styrene-butadiene-styrene block copolymer and blend for 200s, the discharge temperature is 175℃, sheeting, cool and stop for 10h to obtain a hybrid flame-retardant masterbatch.

[0072] S3, the hybrid flame-retardant master batch prepared in S2, 55 kg of solution-polymerized styrene-butadiene rubber, 22 kg of thermoplastic polyurethane elastomer, 3.5 kg of zinc oxide, 1.8 kg of stearic acid, 1.9 kg of sulfur, 0.5 kg of accelerator M, 0.5 kg of accelerator DM, 0.9 kg of accelerator TMTD, 0.9 kg of antioxidant RD, 1 kg of antioxidant 4020, 21 kg of carbon black, 28 kg of tricoctyl phosphate, 9 kg of paraffin oil, and 2.5 kg of antistatic agent are added to a mixer at 60 rpm, dynamically vulcanized at a temperature of 175℃ for 4 min, then dynamically vulcanized at a temperature of 180℃ for 6 min through a double-screw extruder at 70 rpm, pelletized, and cooled to obtain the cover layer.

[0073] S4, 115 kg of polyvinyl chloride paste resin, 55 kg of environmentally friendly plasticizer, 17.5 kg of epoxy soybean oil, 11 kg of liquid butyl nitrile rubber, 35 kg of diphenyl phosphate, 1.75 kg of 1-ethyl-3-methylimidazole diethyl phosphate, 15 kg of melamine cyanurate, and 4.5 kg of calcium-zinc composite stabilizer are sequentially added to a high-speed disperser and stirred at 2900 rpm for 30 min, and then the paste is obtained after the viscosity is 5500 Pa.s. The paste is ground three times through a three-roll grinder with a roll distance of 0.25 mm and a speed of 750 rpm, and then degassed through a vacuum degassing machine at a vacuum degree of -0.085 MPa at room temperature for 30 min to obtain a core impregnated glue.

[0074] S5, the polyarylate fabric whole core is driven by a traction machine to pass through an impregnation tank and a vacuum box filled with the core impregnated glue at a speed of 1.2 m / min, and the vacuum degree is -0.085 MPa. The impregnated polyarylate fabric whole core enters a plasticizing tank at a temperature of 175℃ for plasticizing at a speed of 1.2 m / min to obtain a plasticized core.

[0075] S6, the cover layer granules are dynamically vulcanized through two extruders and a mold at a speed of 50 rpm, and the extruder and mold temperature is 175℃. In order to directly adhere to the plasticized core in a hot state, the surface temperature of the plasticized core is 165℃, and the thickness of the cover layer is 8 mm to obtain the energy-saving and environmentally friendly polyarylate fabric whole-core flame-retardant conveyor belt.

[0076] Example 5: An energy-saving and environmentally friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising a polyarylate fabric whole core, a cover layer, and a core impregnated glue.

[0077] The polyarylate fabric whole core is a 5-layer whole weaving structure composed of LCP fiber, nylon fiber and cotton fiber, and the width is 1456mm; the warp stress line of the core is made of 1500D high-strength LCP fiber, and the single tensile strength of the stranded fiber is 3500N, and the density is 236 strands / 10cm; the upper and lower two layers of the core are cotton fiber, and the middle three layers of the core are LCP fiber, and the cotton content of the warp of the core is 15%; the weft stress line of the core is made of nylon fiber, and the weft is stranded by 1500D nylon fiber and cotton fiber, and the single tensile strength of the weft after stranding is 1250N / strand, and the density is 124 strands / 10cm; the cotton content of the weft of the core is 35%.

[0078] A manufacturing method of an energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt, comprising the following steps:

[0079] S1, put 35kg of white carbon black, 35kg of expanded graphite, 25kg of aluminum diethyl hypophosphite and 2kg of zinc dimethyl imidazole into a kneader and stir at a speed of 400rpm, heat to 60℃, start spraying 5kg of polyacrylamide aqueous solution with a concentration of 3wt%, continue to heat and stir, stir at a temperature of 110℃ for 15min, and get a hybrid flame-retardant composite after cooling.

[0080] S2, add 70kg of hybrid flame-retardant composite into a 40rpm banbury mixer, heat to 80℃, then add 30kg of styrene-butadiene-styrene block copolymer and blend for 200s, the glue discharge temperature is 175℃, sheet out, cool and stop for 10h to get a hybrid flame-retardant masterbatch.

[0081] S3, put the hybrid flame-retardant masterbatch prepared in S2, 60kg of solution styrene-butadiene rubber, 30kg of thermoplastic polyurethane elastomer, 4kg of zinc oxide, 2kg of stearic acid, 2kg of sulfur, 0.5kg of accelerator M, 0.5kg of accelerator DM, 1kg of accelerator TMTD, 1kg of antioxidant RD, 1kg of antioxidant 4020, 22kg of carbon black, 30kg of methyl phenyl diphenyl phosphate, 12kg of paraffin oil and 4kg of antistatic agent into a banbury mixer at 60rpm, dynamically vulcanize at a temperature of 175℃ for 4min, then pass through a double screw extruder at 70rpm and dynamically vulcanize at a temperature of 180℃ for 6min, granulate and cool to get a cover layer.

[0082] S4, 120 kg of polyvinyl chloride paste resin, 60 kg of environmental protection plasticizer, 20 kg of epoxy soybean oil, 12 kg of liquid butyl nitrile rubber, 40 kg of tricresyl phosphate, 2 kg of 1-butyl-3-methylimidazole dibutyl phosphate, 16 kg of melamine cyanurate and 5 kg of calcium-zinc composite stabilizer are sequentially added into a high-speed dispersion machine and stirred at 2900 rpm for 30 min, and then a paste is obtained after the viscosity is 5500 Pa.s, the paste is ground through a three-roll grinding machine for three times, the roll distance of the grinding machine is 0.25 mm, and the rotating speed is 750 rpm, and then the paste is degassed through a vacuum degassing machine, and the paste is degassed at room temperature for 30 min under the condition of a vacuum degree of-0.085 MPa, and a core impregnated rubber is obtained.

[0083] S5, the polyarylate fabric whole core is driven by a traction machine to pass through an impregnation pool and a vacuum box filled with the core impregnated rubber at a speed of 1.2 m / min, and the vacuum degree is-0.085 MPa, and the impregnated polyarylate fabric whole core enters a plasticizing box at 175 DEG C for plasticizing, and the plasticizing speed is 1.2 m / min, and a plasticized core is obtained.

[0084] S6, the covering layer granular material is dynamically vulcanized through two extruders and a mold, the rotating speed of the extruders is 50 rpm, the temperature of the extruders and the mold is 175 DEG C, the surface temperature of the plasticized core is 165 DEG C for directly being attached together with the plasticized core in a hot state, the thickness of the covering layer is 8 mm, and an energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt is obtained.

[0085] The polyarylate fabric whole-core flame-retardant conveyor belts prepared in Examples 1-5 are tested according to the standard MT / T 914-2019, the physical properties and flame-retardant properties of the test samples are tested, and the results are shown in Table 1.

[0086] Table 1:

[0087]

[0088]

[0089]

[0090]

[0091] As shown in Table 1, the energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt prepared by the application has excellent tensile strength, can meet the requirements of high strength, has good flame-retardant properties and antistatic properties, has high adhesive strength between the covering layer and the core layer and is not easy to fall off, is convenient for mechanical joints, has low hydrochloric acid release amount, is environment-friendly and economical, has high strength and long service life.

[0092] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. Energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt, characterized in that, The polyarylate fabric whole belt core, the cover layer and the belt core impregnated sizing are included; The cover layer includes the following components by mass fraction: 40-60 parts of solution polymerized styrene-butadiene rubber, 20-30 parts of styrene-butadiene-styrene block copolymer, 20-30 parts of thermoplastic polyurethane elastomer, 2-4 parts of zinc oxide, 1-2 parts of stearic acid, 1.6-2 parts of sulfur, 1.6-2 parts of accelerator, 1.6-2 parts of antioxidant, 18-22 parts of carbon black, 60-70 parts of hybrid flame-retardant composite material, 20-30 parts of phosphate ester flame retardant, 8-12 parts of paraffin oil and 2-4 parts of antistatic agent; The phosphate ester flame retardant is any one of toluene diphenyl phosphate, diphenyl phosphate and trioctyl phosphate; The polyarylate fabric whole belt core is a 4-5 layer whole weaving structure composed of liquid crystal polyarylate fiber, nylon fiber and cotton fiber, and the width is 104-106% of the belt width; The warp stress line of the polyarylate fabric whole belt core is composed of 1000D or 1500D high-strength liquid crystal polyarylate fiber, and the single tensile strength after plying is 1500-3500N, and the density is 184-279 roots / 10cm; The weft stress line of the polyarylate fabric whole belt core is composed of 1000D or 1500D nylon fiber and cotton fiber, and the single tensile strength after plying is 450-1250N / root, and the density is 124-160 roots / 10cm; The upper and lower two layers of warp of the polyarylate fabric whole belt core are cotton fiber, and the middle 2-3 layers of warp are liquid crystal polyarylate fiber, and the cotton content of the belt core warp is 15-25%, and the cotton content of the belt core weft is 35-45%; The hybrid flame-retardant composite material is prepared by the following steps: White carbon black, expanded graphite, aluminum diethyl phosphinate and zinc dimethyl imidazole are put into a kneader for heating and stirring, the stirring speed is 350-400rpm, heating to 40-60℃, starting to spray 2-3wt% polyacrylamide aqueous solution, continue to heat and stir, stirring at 105-110℃ for 10-15min, after cooling, the hybrid flame-retardant composite material is obtained.

2. The energy-saving and environment-friendly polyarylate fabric core-integrated flame-retardant conveyor belt according to claim 1, characterized in that, The accelerator is accelerator M, accelerator DM and accelerator TMTD mixed in any ratio; the antioxidant is antioxidant RD and 4020 mixed in any ratio.

3. The energy-saving and environment-friendly polyarylate fabric core-integrated flame-retardant conveyor belt according to claim 1, characterized in that, The belt core impregnated sizing includes the following components by mass fraction: 100-120 parts of polyvinyl chloride paste resin, 40-60 parts of environment-friendly plasticizer, 10-20 parts of epoxy soybean oil, 8-12 parts of liquid nitrile rubber, 20-40 parts of phosphate ester flame retardant, 1-2 parts of imidazole phosphate ionic liquid flame retardant, 12-16 parts of intumescent flame retardant and 3-5 parts of calcium-zinc composite stabilizer.

4. The energy-saving and environment-friendly polyarylate fabric core-integrated flame-retardant conveyor belt according to claim 3, characterized in that, The belt core impregnated sizing is prepared by the following steps: Polyvinyl chloride paste resin, environment-friendly plasticizer, epoxy soybean oil, liquid nitrile rubber, phosphate ester flame retardant, imidazole phosphate ionic liquid flame retardant, intumescent flame retardant and calcium-zinc composite stabilizer are added into a high-speed disperser in turn and stirred, then ground through a three-roll grinder and defoamed through a vacuum defoaming machine to obtain the belt core impregnated sizing.

5. The energy-saving and environment-friendly polyarylate fabric core-integrated flame-retardant conveyor belt according to claim 4, characterized in that, The imidazole phosphate ionic liquid flame retardant is any one of 1-ethyl-3-methyl imidazole dimethyl phosphate, 1-ethyl-3-methyl imidazole diethyl phosphate and 1-butyl-3-methyl imidazole dibutyl phosphate; the intumescent flame retardant is any one of ammonium polyphosphate, melamine polyphosphate and melamine cyanurate.

6. The energy-saving and environment-friendly polyarylate fabric core-integrated flame-retardant conveyor belt according to claim 1, characterized in that, The cover layer is prepared by the following steps: The hybrid flame-retardant composite is added into a banbury mixer at 20-40 rpm, heated to 70-80 DEG C, then the styrene-butadiene-styrene block copolymer is added and blended for 180-200 s, the discharge temperature is 165-175 DEG C, the sheet is discharged, and the hybrid flame-retardant masterbatch is obtained after cooling and standing for 8-10 h; The hybrid flame-retardant masterbatch, solution-polymerized styrene-butadiene rubber, thermoplastic polyurethane elastomer, zinc oxide, stearic acid, sulfur, accelerator, antioxidant, carbon black, phosphate flame retardant, paraffin oil and antistatic agent are added into the banbury mixer at 40-60 rpm and mixed, and dynamic vulcanization is carried out at 167-175 DEG C for 3-4 min, then dynamic vulcanization is carried out at 175-180 DEG C for 5-6 min through the double-screw extruder at 50-70 rpm, and the cover layer is obtained after granulation and cooling.

7. The energy-saving and environment-friendly polyarylate fabric core-integrated flame-retardant conveyor belt according to claim 1, characterized in that, The mass ratio of the white carbon black, expanded graphite, aluminum diethyl phosphite, zinc dimethyl imidazole and polyacrylamide aqueous solution is 30-35:30-35:20-25:1-2:4-5.

8. The manufacturing method of the energy-saving and environment-friendly polyarylate fabric core-integrated flame-retardant conveyor belt according to claim 1, characterized in that, The method comprises the following steps: Step one, the whole polyarylate fabric core is dipped through the dipping tank filled with the dipping glue and the vacuum box, and the dipped polyarylate fabric core is plasticized in the plasticizing tank at 160-175 DEG C, and the plasticizing speed is 0.6-1.2 m / min, to obtain the plasticized core; Step two, the cover layer granules are dynamically vulcanized through two extruders and a mold, the rotating speed of the extruder is 30-50 rpm, the temperature of the extruder and the mold is 160-175 DEG C, the plasticized core is directly pasted with the cover layer in the hot state, the surface temperature of the plasticized core is 145-165 DEG C, the thickness of the cover layer is 6-8 mm, and the energy-saving and environment-friendly polyarylate fabric whole-core flame-retardant conveyor belt is obtained.

Images