High-wear-resistance and high-strength conveying belt and preparation process thereof

Abstract

The invention relates to the technical field of conveying belts, and particularly discloses a high-wear-resistance and high-strength conveying belt and a preparation process thereof. The high-wear-resistance and high-strength conveying belt comprises covering rubber and a framework layer, and the covering rubber is prepared from, by weight, 100 parts of modified rubber, 45-55 parts of polydopamine modified carbon black, 4-5 parts of vulcanizing agent, 6.5-7.5 parts of active agent and 1-2 parts of anti-aging agent; the modified rubber is rubber subjected to plasma treatment. According to the invention, the compatibility of rubber and carbon black is improved, so that the tensile property and wear resistance of the prepared conveyor belt are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of conveying belt, more particularly, it relates to a high wear-resistant and high-strength conveying belt and a preparation process thereof. BACKGROUND

[0002] In the modern industrial system, conveying belt as the core equipment of continuous material transportation is widely used in heavy industrial fields such as coal, mine, metallurgy, port and building material. These scenes are often accompanied by extremely complex working conditions: there are not only continuous friction and impact in the process of material transportation, but also multiple environmental pressures such as high temperature, humidity and corrosive medium. Taking the mine industry as an example, the conveying belt needs to bear the long-term crushing of a large number of sharp ores, and the daily running mileage of a single conveying belt can reach hundreds of kilometers, and the annual cumulative running mileage exceeds 100,000 kilometers. In the port bulk transportation, the conveying belt needs to resist the sea salt mist corrosion and the diurnal temperature difference change, and at the same time, it needs to withstand the instantaneous impact of ten-thousand-ton material. The traditional conveying belt is limited by the material performance and the preparation process, and it is difficult to meet the above harsh requirements. The early rubber conveying belt mostly uses natural rubber single matrix, which has a certain elasticity, but the wear resistance is insufficient, and the wear amount is generally 50mm 3 Above, it needs to be replaced in 1-3 months under high load working condition; with the expansion of industrial production scale and the intelligent upgrading, the market puts forward higher requirements on the performance of the conveying belt: on the one hand, it needs to have excellent wear resistance to prolong the replacement cycle and reduce the operation and maintenance cost; on the other hand, it needs to have excellent high-strength characteristics to adapt to large-span and high-load transportation scenes and reduce the risk of fracture. Under this background, the research and development of new conveying belt with high wear resistance and high strength become the key breakthrough to solve the efficiency bottleneck of industrial transportation and reduce the comprehensive operation cost, and also become an important direction to promote the upgrading of material transportation equipment.

[0003] The patent application file with publication number CN104311896A discloses a high-strength and high-wear-resistant H-shaped covering rubber for steel cord core conveying belt, which is prepared from the following components in parts by weight: natural rubber 50-60 parts, butadiene rubber BR9000 40-50 parts, carbon black 50-60 parts, vulcanization activator 4-7 parts, aromatic oil 4-8 parts, carbon five resin 2-4 parts, protective wax 2 parts, antioxidant 1-3 parts, oil-extended insoluble sulfur 1.3-2.5 parts, vulcanization accelerator 1-2.5 parts, and anti-scorching agent CTP 0.1-0.3 parts. The method improves the tensile strength and wear resistance of the conveying belt by optimizing the formula system of the H-shaped covering rubber, and simultaneously improves the reinforcing effect by adding carbon black, but due to the poor compatibility between the rubber matrix and the carbon black, the carbon black is not uniformly dispersed to form stress concentration points, the interface bonding force is weak so that the stress cannot be effectively transmitted, and the adsorption force of the carbon black to the rubber molecules is weak, so the rubber molecular chain is easy to slide on the surface of the carbon black during stretching, and finally the tensile strength of the prepared conveying belt is not high, and the belt body is easy to tear and delaminate in high-strength transportation. SUMMARY

[0004] In order to improve the tensile strength of the prepared conveyor belt, the application provides a high wear-resistant high-strength conveyor belt and a preparation process thereof.

[0005] In a first aspect, the application provides a high wear-resistant high-strength conveyor belt, which adopts the following technical scheme: A high wear-resistant high-strength conveyor belt, comprising a cover rubber and a framework layer, wherein the cover rubber comprises the following raw materials in parts by weight: modified rubber 100 parts, polydopamine modified carbon black 45-55 parts, vulcanizing agent 4-5 parts, active agent 6.5-7.5 parts, and anti-aging agent 1-2 parts; and the modified rubber is a plasma-treated rubber.

[0006] By adopting the above technical scheme, the plasma-treated rubber is bonded with the polydopamine modified carbon black, the micro-nano morphology of the surface of the modified carbon black and the rough structure of the surface of the rubber form physical anchoring, the plasma treatment improves the surface energy of the rubber, the polydopamine modification reduces the interfacial energy difference between the carbon black and the rubber, the carbon black is more uniformly dispersed in the rubber matrix, and the compatibility between the rubber and the carbon black is improved through the synergistic effect of chemical combination, physical embedding and dispersion optimization, thereby improving the tensile properties and wear resistance of the prepared conveyor belt.

[0007] Preferably, the preparation process of the modified rubber is as follows: the rubber is placed in a plasma device, a gas is introduced, the pressure in the chamber is maintained at 40-60 Pa, the power is set to 80-100 W, and the treatment time is 40-80 s.

[0008] By adopting the above technical scheme, the surface of the rubber is modified by plasma, the surface molecular chain is broken and polar groups are introduced, the interfacial polarity of the rubber can be effectively adjusted, the compatibility with the carbon black is enhanced, and the tensile strength and wear resistance of the conveyor belt are improved; when the power is too low, it is difficult to effectively initiate the chemical reaction and etching of the surface of the rubber; and when the power is too high and the time is too long, the surface of the rubber may be excessively oxidized and the molecular chain may be severely broken, affecting the bulk properties; therefore, under the above process parameters, the surface of the rubber can form appropriate polar groups and have appropriate roughness.

[0009] Preferably, the gas is a mixture of oxygen and argon with a volume ratio of (2-4):(6-8).

[0010] By adopting the above technical scheme, oxygen can introduce polar oxygen-containing groups on the surface of the rubber to enhance the polar interaction with the carbon black; argon as an inert gas mainly plays an etching role to increase the roughness of the surface of the rubber and promote the physical anchoring effect; and the combination of the two improves the combination of the rubber and the carbon black.

[0011] Preferably, the rubber is a mixture of natural rubber and butadiene rubber in a mass ratio of (55-65):(35-45).

[0012] By adopting the above technical scheme, the natural rubber has high elasticity, high strength and good processing performance, and the butadiene rubber gives the rubber excellent wear resistance and fatigue resistance, and the combination of the two can optimize the comprehensive performance of the conveyor belt.

[0013] Preferably, the preparation process of the polydopamine modified carbon black comprises the following steps: (1) ultrasonic dispersion of carbon black in deionized water to obtain a suspension; (2) adding the suspension into a Tris-HCl buffer solution, adjusting the pH of the system to 8.0-8.5, adding a dopamine monomer, reacting, washing and drying to obtain the polydopamine modified carbon black; The mass ratio of the dopamine monomer to the carbon black is 1:(2-10).

[0014] By adopting the above technical scheme, the self-oxidation and polymerization characteristics of dopamine under alkaline conditions are utilized to form a polydopamine coating on the surface of the carbon black. The polydopamine contains a large number of polar groups such as catechol and amino groups, which can form hydrogen bonds, van der Waals forces or chemical adsorption with the molecules of the modified rubber, significantly enhancing the interfacial bonding force between the carbon black and the rubber matrix.

[0015] Preferably, the carbon black is further subjected to oxidation treatment before being modified with polydopamine. Specifically, the carbon black is added into a nitric acid solution to form a mixture, heated to 60-100℃ under stirring for 2-6h, after the reaction, cooled to room temperature, the mixture is poured into deionized water, stirred and then filtered, the filter cake is washed until the pH of the filtrate is 5-7, the washed filter cake is vacuum dried at 80-100℃ for 8-12h, and then ground to obtain the oxidized carbon black. The mass-to-volume ratio of the carbon black to the nitric acid solution is 1:(10-20)g / mL.

[0016] By adopting the above technical scheme, the carbon black is oxidized by the nitric acid oxidation method, a large number of carboxyl groups are introduced, and the polarity of the carbon black surface is significantly improved. On the one hand, it provides rich reaction sites for subsequent polydopamine modification, ensuring that the polydopamine coating can be firmly anchored on the surface of the carbon black. On the other hand, the surface polarity of the carbon black after oxidation treatment combined with polydopamine modification is highly matched with the polar surface of the plasma treated rubber, greatly reducing the interfacial tension. At the same time, strong dipole interaction and electrostatic attraction can occur between the polar groups of polydopamine and the polar groups on the surface of the rubber, further enhancing the interfacial adsorption and improving the bonding of the rubber and the carbon black.

[0017] Preferably, the carbon black is one of N110 carbon black, N220 carbon black, N330 carbon black, N550 carbon black, and more preferably N330 carbon black.

[0018] By adopting the above technical solution, the N330 carbon black has a suitable specific surface area and structure, which can uniformly introduce functional groups through oxidation treatment to efficiently anchor polydopamine, and can form multiple interactions with the polar groups on the surface of the rubber after plasma treatment, thereby ensuring the interface bonding strength.

[0019] Preferably, the vulcanizing agent is a mixture of sulfur and accelerator with a mass ratio of (2-3):2; the accelerator is accelerator NS and accelerator DM with a mass ratio of (2-3):(1-2).

[0020] By adopting the above technical solution, the activation energy of sulfur vulcanization is reduced by the accelerator, the vulcanization efficiency is improved, the time is shortened and the temperature is reduced, the damage of high temperature to rubber is reduced; at the same time, the crosslinking density and distribution are precisely controlled, the strength, wear resistance and other mechanical properties of the vulcanized rubber are enhanced, the scorching problem in the processing process can be avoided by the aftereffect of the accelerator, the by-products such as free sulfur are reduced, the blooming risk is reduced, and the aging resistance and service life of the conveyor belt are improved.

[0021] The NS accelerator has excellent aftereffect, low activity in the processing stage, ensures that premature vulcanization does not occur, ensures processing safety, and quickly takes effect during high temperature vulcanization; the DM accelerator as a quasi-speed accelerator can prolong the vulcanization flat period and avoid performance fluctuations caused by too fast reaction in the later stage of vulcanization, and the combination of the two can optimize the crosslinking structure and balance the strength and toughness of the vulcanized rubber, so that the conveyor belt exhibits more balanced mechanical properties and durability when subjected to dynamic load and friction.

[0022] Preferably, the active agent is a mixture of zinc oxide and stearic acid with a mass ratio of (8-12):(3-5).

[0023] By adopting the above technical solution, zinc oxide can react with the accelerator to generate an intermediate product with high activity, reduce the activation energy of the vulcanization reaction, accelerate the crosslinking reaction of sulfur and rubber molecules, and improve the vulcanization speed and crosslinking density; at the same time, zinc oxide can enhance the heat resistance, aging resistance and mechanical strength of the vulcanized rubber. Stearic acid acts as an activator, on the one hand, it can react with zinc oxide to form soluble zinc stearate, improving the dispersibility of zinc oxide in rubber and ensuring uniform activation; on the other hand, stearic acid can lubricate the rubber molecular chain, improve the processing fluidity of the rubber, and participate in the construction of the vulcanization network to assist in enhancing the adhesion between the rubber and the skeleton layer. After the two are compounded, the vulcanization activation effect is strengthened, the high strength, high wear resistance and fatigue resistance of the conveyor belt vulcanized rubber are ensured, and the processing process is optimized, so that the conveyor belt maintains stability when subjected to dynamic load, friction and environmental aging for a long time.

[0024] In a second aspect, the application provides a preparation process of a high-wear-resistance high-strength conveying belt, which adopts the following technical scheme. The preparation process of the high-wear-resistance high-strength conveying belt comprises the following steps. The raw materials of the cover rubber are weighed according to the formula and mixed and milled to obtain a milled rubber, and the milled rubber is opened and milled to obtain a rubber sheet, and the rubber sheet is extruded to obtain a rubber material; The adhesive is uniformly coated on the surface of the steel wire rope core and then dried to obtain a skeleton layer; The rubber material is laminated and combined with the skeleton layer to obtain a conveying belt blank; The conveying belt blank is vulcanized to obtain a conveying belt.

[0025] In summary, the application has the following beneficial effects: 1. In the application, the rubber is treated by plasma and the carbon black is modified by polydopamine, and the two can be combined by bonding. After modification, the micro-nano morphology on the surface of the carbon black and the rough structure on the surface of the rubber form physical anchoring. The plasma treatment improves the surface energy of the rubber, and the polydopamine modification reduces the interfacial energy difference between the carbon black and the rubber, so that the carbon black is more uniformly dispersed in the rubber matrix. Through the synergistic effect of chemical combination, physical embedding and dispersion optimization, the compatibility of the rubber and the carbon black is improved, and the tensile properties and wear resistance of the prepared conveying belt are improved.

[0026] 2. In the application, a mixed gas of oxygen and argon is used for plasma treatment of the rubber. Oxygen can introduce polar oxygen-containing groups on the surface of the rubber to enhance the polar interaction with the carbon black. Argon, as an inert gas, mainly plays an etching role to increase the roughness of the rubber surface and promote the physical anchoring effect. Through the combined action of chemical and physical combination, the combination of the rubber and the carbon black is improved.

[0027] 3. In the application, the carbon black is treated by oxidation, which provides rich reaction sites for subsequent polydopamine modification, ensuring that the polydopamine coating can be firmly anchored on the surface of the carbon black. On the other hand, after oxidation treatment combined with polydopamine modification, the polarity of the carbon black surface is highly matched with the polar surface of the plasma-treated rubber, greatly reducing the interfacial tension and further improving the compatibility of the rubber and the carbon black. DETAILED DESCRIPTION

[0028] The application will be further described in detail below in combination with examples.

[0029] The raw materials of the examples and comparative examples of the application are ordinary commercially available, except for special instructions.

[0030] Preparation Examples 1-11 modified rubber Preparation Example 1 The preparation example discloses a preparation process of modified rubber, and specifically, 100g of natural rubber is placed into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; oxygen is introduced, the pressure in the chamber is maintained at 40Pa, a radio frequency power source is turned on, the power is set to 80W, and the modified rubber is obtained after 80s of treatment.

[0031] Preparation Example 2 The preparation example discloses a preparation process of modified rubber, and specifically, 100g of natural rubber is placed into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; oxygen is introduced, the pressure in the chamber is maintained at 50Pa, a radio frequency power source is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0032] Preparation Example 3 The preparation example discloses a preparation process of modified rubber, and specifically, 100g of natural rubber is placed into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; oxygen is introduced, the pressure in the chamber is maintained at 60Pa, a radio frequency power source is turned on, the power is set to 100W, and the modified rubber is obtained after 40s of treatment.

[0033] Preparation Example 4 The preparation example discloses a preparation process of modified rubber, and specifically, 100g of natural rubber is placed into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; oxygen is introduced, the pressure in the chamber is maintained at 50Pa, a radio frequency power source is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0034] Preparation Example 5 The preparation example discloses a preparation process of modified rubber, and specifically, 100g of natural rubber is placed into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; oxygen is introduced, the pressure in the chamber is maintained at 50Pa, a radio frequency power source is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0035] Preparation Example 6 The preparation example discloses a preparation process of modified rubber, and specifically, 100g of natural rubber is placed into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; oxygen is introduced, the pressure in the chamber is maintained at 50Pa, a radio frequency power source is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0036] Preparation Example 7 The preparation example discloses a preparation process of modified rubber, specifically: 65g of natural rubber and 35g of butadiene rubber are uniformly mixed and then put into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; oxygen is introduced to maintain the pressure in the chamber at 50Pa, the radio frequency power supply is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0037] Preparation example 8 The preparation example discloses a preparation process of modified rubber, specifically: 60g of natural rubber and 40g of butadiene rubber are uniformly mixed and then put into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; argon is introduced to maintain the pressure in the chamber at 50Pa, the radio frequency power supply is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0038] Preparation example 9 The preparation example discloses a preparation process of modified rubber, specifically: 60g of natural rubber and 40g of butadiene rubber are uniformly mixed and then put into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; a mixed gas of oxygen and argon with a volume ratio of 2:8 is introduced to maintain the pressure in the chamber at 50Pa, the radio frequency power supply is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0039] Preparation example 10 The preparation example discloses a preparation process of modified rubber, specifically: 60g of natural rubber and 40g of butadiene rubber are uniformly mixed and then put into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; a mixed gas of oxygen and argon with a volume ratio of 3:7 is introduced to maintain the pressure in the chamber at 50Pa, the radio frequency power supply is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0040] Preparation example 11 The preparation example discloses a preparation process of modified rubber, specifically: 60g of natural rubber and 40g of butadiene rubber are uniformly mixed and then put into a plasma treatment chamber, the chamber is closed and vacuumized to 10Pa; a mixed gas of oxygen and argon with a volume ratio of 4:6 is introduced to maintain the pressure in the chamber at 50Pa, the radio frequency power supply is turned on, the power is set to 90W, and the modified rubber is obtained after 60s of treatment.

[0041] Preparation examples 12-17 polydopamine modified carbon black Preparation example 12 The preparation example discloses a preparation process of polydopamine modified carbon black, specifically comprising the following steps: (1) The N330 carbon black is washed with deionized water for 3 times, vacuum dried at 70℃ for 5h to obtain impurity-removed carbon black, 100g of the impurity-removed carbon black is added into 10L of deionized water, and ultrasonic treatment is performed for 45min under a power of 400W to form a suspension; (2) Preparation of 0.05 mol / L Tris-HCl buffer solution: 6.057 g of Tris was weighed and added to 800 mL of deionized water, and stirred until completely dissolved. The pH electrode was placed in the solution, and concentrated hydrochloric acid was slowly added while stirring until the pH of the solution was 8.5. A small amount of deionized water was used to rinse the beaker and glass rod, and the rinse was poured into the solution with the adjusted pH, and deionized water was added to make up to 1 L to obtain a 0.05 mol / L Tris-HCl buffer solution; (3) The above Tris-HCl buffer solution was added to the suspension, and the pH of the system was adjusted to 8.5. 20 g of dopamine hydrochloride was slowly added, and the stirring was continued and the reaction temperature was controlled at 25°C, and the reaction was carried out for 10 h; (4) After the reaction was completed, the mixture was centrifuged at 10,000 rpm for 10 min, and the black precipitate was collected and washed with deionized water until the supernatant was colorless to obtain carbon black-polydopamine. The carbon black-polydopamine was placed in a vacuum drying oven and dried at 70°C for 18 h until the weight was constant. The dried product was ground through a 200 mesh sieve to obtain polydopamine modified carbon black.

[0042] Preparation Example 13 The present preparation example discloses a preparation process of polydopamine modified carbon black, which specifically comprises the following steps: (1) The N330 carbon black was washed with deionized water for 3 times, and then vacuum dried at 70°C for 5 h to obtain impurity-removed carbon black. 100 g of the impurity-removed carbon black was added to 10 L of deionized water, and ultrasonic treatment was carried out at a power of 400 W for 45 min to form a suspension; (2) Preparation of 0.05 mol / L Tris-HCl buffer solution: 6.057 g of Tris was weighed and added to 800 mL of deionized water, and stirred until completely dissolved. The pH electrode was placed in the solution, and concentrated hydrochloric acid was slowly added while stirring until the pH of the solution was 8.5. A small amount of deionized water was used to rinse the beaker and glass rod, and the rinse was poured into the solution with the adjusted pH, and deionized water was added to make up to 1 L to obtain a 0.05 mol / L Tris-HCl buffer solution; (3) The above Tris-HCl buffer solution was added to the suspension, and the pH of the system was adjusted to 8.5. 20 g of dopamine hydrochloride was slowly added, and the stirring was continued and the reaction temperature was controlled at 25°C, and the reaction was carried out for 10 h; (4) After the reaction is completed, centrifugal separation is performed on the mixed solution at a rotation speed of 10000 rpm for 10 min, the black precipitate at the lower layer is collected, and the precipitate is repeatedly washed with deionized water until the supernatant is colorless to obtain carbon black-polydopamine; the carbon black-polydopamine is placed in a vacuum drying box and dried at 70°C for 18 h until the weight is constant; the dried product is ground through a 200-mesh sieve to obtain polydopamine modified carbon black.

[0043] Preparation Example 14 The present preparation example discloses a preparation process of polydopamine modified carbon black, which specifically comprises the following steps: (1) The N330 carbon black is washed with deionized water for 3 times, and then dried at 70°C under vacuum for 5 h to obtain impurity-removed carbon black. 100 g of the impurity-removed carbon black is added into 10 L of deionized water, and ultrasonic treatment is performed under a power of 400 W for 45 min to form a suspension; (2) A 0.05 mol / L Tris-HCl buffer solution is prepared: 6.057 g of tris-hydroxymethyl aminomethane is taken and added into 800 mL of deionized water, and stirred until completely dissolved. The pH meter electrode is placed in the solution, and concentrated hydrochloric acid is slowly added dropwise while stirring until the pH of the solution is 8.5. The beaker and glass rod are rinsed with a small amount of deionized water, and the rinsing liquid is poured into the solution with the adjusted pH, and deionized water is added to a constant volume of 1 L to obtain a 0.05 mol / L Tris-HCl buffer solution; (3) The Tris-HCl buffer solution is added to the suspension, and the pH of the system is adjusted to 8.5. 10 g of dopamine hydrochloride is slowly added, and stirring is continued while the reaction temperature is controlled at 25°C. The reaction is performed for 10 h; (4) After the reaction is completed, centrifugal separation is performed on the mixed solution at a rotation speed of 10000 rpm for 10 min, the black precipitate at the lower layer is collected, and the precipitate is repeatedly washed with deionized water until the supernatant is colorless to obtain carbon black-polydopamine; the carbon black-polydopamine is placed in a vacuum drying box and dried at 70°C for 18 h until the weight is constant; the dried product is ground through a 200-mesh sieve to obtain polydopamine modified carbon black.

[0044] Preparation Example 15 The present preparation example is basically the same as Preparation Example 13, except that in step (1), the N330 carbon black is washed with deionized water for 3 times, and then dried at 70°C under vacuum for 5 h to obtain impurity-removed carbon black. 100 g of the impurity-removed carbon black is added into 1 L of 65 wt% nitric acid solution and stirred uniformly to form a mixture. Under stirring, heating is performed to 60°C, and the reaction is performed for 6 h. After the reaction is completed, the mixture is cooled to room temperature, poured into deionized water, and then filtered after stirring. The filter cake is washed until the pH of the filtrate is 5. The washed filter cake is placed in a vacuum drying box and dried at 80°C for 12 h. After grinding, oxidized carbon black is obtained. 100 g of the impurity-removed carbon black is added into 10 L of deionized water, and ultrasonic treatment is performed under a power of 400 W for 45 min to form a suspension.

[0045] Preparation Example 16 The preparation example is basically the same as preparation example 13, except that in step (1), the N330 carbon black is washed with deionized water for 3 times, then vacuum dried at 70°C for 5h to obtain the impurity-removed carbon black, 100g of the impurity-removed carbon black is added into 1.5L of 65wt% nitric acid solution to form a mixture, heated to 80°C under stirring, and reacted for 4h, after the reaction, cooled to room temperature, the mixture is poured into deionized water, stirred and then suction filtered, the filter cake is washed until the filtrate pH=6, the washed filter cake is placed in vacuum drying at 90°C for 10h, and then ground to obtain the oxidized carbon black; 100g of the impurity-removed carbon black is added into 10L of deionized water, and ultrasonic treated for 45min under 400W power to form a suspension.

[0046] Preparation Example 17 The preparation example is basically the same as preparation example 13, except that in step (1), the N330 carbon black is washed with deionized water for 3 times, then vacuum dried at 70°C for 5h to obtain the impurity-removed carbon black, 100g of the impurity-removed carbon black is added into 2L of 65wt% nitric acid solution to form a mixture, heated to 80°C under stirring, and reacted for 2h, after the reaction, cooled to room temperature, the mixture is poured into deionized water, stirred and then suction filtered, the filter cake is washed until the filtrate pH=7, the washed filter cake is placed in vacuum drying at 100°C for 8h, and then ground to obtain the oxidized carbon black; 100g of the impurity-removed carbon black is added into 10L of deionized water, and ultrasonic treated for 45min under 400W power to form a suspension.

[0047] Example 1 The example provides a high wear-resistant high-strength conveying belt, which comprises a cover rubber and a skeleton layer, wherein the cover rubber comprises the following raw materials: modified rubber 10kg, polydopamine modified carbon black 4.5kg, vulcanizing agent 0.5kg, active agent 0.75kg and antioxidant 4010NA 0.1kg, wherein the modified rubber is obtained by preparation example 1, the polydopamine modified carbon black is obtained by preparation example 12, the vulcanizing agent is 0.3kg of sulfur, 0.15kg of accelerator NS and 0.05kg of accelerator DM, and the active agent is 0.6kg of zinc oxide and 0.15kg of stearic acid.

[0048] The example also provides a preparation process of the above high wear-resistant high-strength conveying belt, which comprises the following steps: Mixing: the modified rubber was weighed according to the formula and put into the internal mixer, plasticated for 2 min under the condition of initial temperature 80 ℃ and rotation speed 60 r / min; 2.25 kg of polydopamine modified carbon black was added and mixed for 3 min, and the temperature was controlled at 110 ℃ during the mixing; then zinc oxide, stearic acid and antioxidant 4010NA were added and mixed for 2 min, and the mixing rubber was discharged when the temperature was not more than 125 ℃; the mixing rubber was put into the internal mixer again under the condition of initial temperature 90 ℃ and rotation speed 50 r / min, and the remaining 2.25 kg of polydopamine modified carbon black was added and mixed for 3 min; then accelerator NS, accelerator DM and sulfur were added and mixed for 2 min, and the internal mixing rubber was discharged when the temperature was not more than 110 ℃; Opening: the above internal mixing rubber was transferred to the open mill, the roller temperature was controlled at 55 ℃, the roller distance was adjusted to 1 mm, and thin passing was performed for 5 times; then the roller distance was adjusted to 3 mm, and triangle bag and rolling were performed for 3 times respectively, finally the rubber sheet with a thickness of 4 mm was prepared by tabletting, and was stored at room temperature for 24 h for standby; the opened rubber sheet was put into the screw extruder, and the extrusion temperature was set to 110 ℃, and the rubber material with a thickness of 4 mm was obtained by extrusion; Framework layer: the steel wire rope was soaked in gasoline for 30 min, and then was dried by hot air; a resorcinol-formaldehyde-latex system (RFL adhesive) was uniformly coated on the surface of the steel wire rope core at a coating amount of 5 g / m, and then was dried in an oven at 80 ℃ for 10 min; Calendering: the extruded rubber material was compounded with the arranged steel wire rope core on the calendering machine, the calendering temperature was 110 ℃, and the pressure was 4 MPa, so that the rubber material uniformly coated the steel wire rope core to form a conveyor belt blank with a thickness of 10 mm; the conveyor belt blank was put into a flat plate vulcanizing machine, the vulcanizing temperature was set to 150 ℃, the vulcanizing pressure was set to 10 MPa, and the vulcanizing was performed for 20 min; after the vulcanizing was completed, the conveyor belt was taken out and naturally cooled to below 40 ℃ at room temperature; the excess rubber material was removed by trimming to obtain the conveyor belt.

[0049] Example 2 The example is basically the same as example 1, except that the covering rubber in the example comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained by preparation example 1, the polydopamine modified carbon black is obtained by preparation example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0050] Example 3 This example is basically the same as Example 1, except that in this example, the covering glue comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5.5 kg, vulcanizing agent 0.4 kg, active agent 0.65 kg, and antioxidant 4010NA 0.2 kg, wherein the modified rubber is obtained by Preparation Example 1, the polydopamine modified carbon black is obtained by Preparation Example 12, the vulcanizing agent is 0.2 kg of sulfur, 0.1 kg of accelerator NS, and 0.1 kg of accelerator DM, and the active agent is 0.4 kg of zinc oxide and 0.25 kg of stearic acid.

[0051] Example 4 This example is basically the same as Example 2, except that in this example, the covering glue comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained by Preparation Example 2, the polydopamine modified carbon black is obtained by Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0052] Example 5 This example is basically the same as Example 2, except that in this example, the covering glue comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained by Preparation Example 3, the polydopamine modified carbon black is obtained by Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0053] Example 6 This example is basically the same as Example 2, except that in this example, the covering glue comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained by Preparation Example 4, the polydopamine modified carbon black is obtained by Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0054] Example 7 This example is substantially the same as Example 2, except that in this example the cover rubber comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained by using the product of Preparation Example 5, the polydopamine modified carbon black is obtained by using the product of Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0055] Example 8 This example is substantially the same as Example 2, except that in this example the cover rubber comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained by using the product of Preparation Example 6, the polydopamine modified carbon black is obtained by using the product of Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0056] Example 9 This example is substantially the same as Example 2, except that in this example the cover rubber comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained by using the product of Preparation Example 7, the polydopamine modified carbon black is obtained by using the product of Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0057] Example 10 This example is substantially the same as Example 2, except that in this example the cover rubber comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained by using the product of Preparation Example 8, the polydopamine modified carbon black is obtained by using the product of Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0058] Example 11 This example is substantially the same as Example 2, except that in this example the cover gum comprises the following ingredients: modified rubber 10 kg, polydopamine-modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained in Preparation Example 9, the polydopamine-modified carbon black is obtained in Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0059] Example 12 This example is substantially the same as Example 2, except that in this example the cover gum comprises the following ingredients: modified rubber 10 kg, polydopamine-modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained in Preparation Example 10, the polydopamine-modified carbon black is obtained in Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0060] Example 13 This example is substantially the same as Example 2, except that in this example the cover gum comprises the following ingredients: modified rubber 10 kg, polydopamine-modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained in Preparation Example 11, the polydopamine-modified carbon black is obtained in Preparation Example 12, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0061] Example 14 This example is substantially the same as Example 2, except that in this example the cover gum comprises the following ingredients: modified rubber 10 kg, polydopamine-modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained in Preparation Example 10, the polydopamine-modified carbon black is obtained in Preparation Example 13, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0062] Example 15 This example is basically the same as Example 2, except that in this example the cover gum comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained in Preparation Example 10, the polydopamine modified carbon black is obtained in Preparation Example 14, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0063] Example 16 This example is basically the same as Example 2, except that in this example the cover gum comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained in Preparation Example 10, the polydopamine modified carbon black is obtained in Preparation Example 15, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0064] Example 17 This example is basically the same as Example 2, except that in this example the cover gum comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained in Preparation Example 10, the polydopamine modified carbon black is obtained in Preparation Example 16, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0065] Example 18 This example is basically the same as Example 2, except that in this example the cover gum comprises the following raw materials: modified rubber 10 kg, polydopamine modified carbon black 5 kg, vulcanizing agent 0.45 kg, active agent 0.7 kg, and antioxidant 4010NA 0.15 kg, wherein the modified rubber is obtained in Preparation Example 10, the polydopamine modified carbon black is obtained in Preparation Example 17, the vulcanizing agent is 0.25 kg of sulfur, 0.125 kg of accelerator NS, and 0.075 kg of accelerator DM, and the active agent is 0.5 kg of zinc oxide and 0.2 kg of stearic acid.

[0066] Comparative Example 1 The comparative example is basically the same as example 1, except that the covering rubber in the comparative example comprises the following raw materials: natural rubber 10 kg, carbon black 4.5 kg, vulcanizing agent 0.5 kg, active agent 0.75 kg and antioxidant 4010NA 0.1 kg, wherein the vulcanizing agent is 0.3 kg of sulfur, 0.15 kg of accelerator NS and 0.05 kg of accelerator DM, and the active agent is 0.6 kg of zinc oxide and 0.15 kg of stearic acid.

[0067] Comparative example 2 The comparative example is basically the same as example 1, except that the covering rubber in the comparative example comprises the following raw materials: modified rubber 10 kg, carbon black 4.5 kg, vulcanizing agent 0.5 kg, active agent 0.75 kg and antioxidant 4010NA 0.1 kg, wherein the modified rubber is obtained by preparation example 1, the vulcanizing agent is 0.3 kg of sulfur, 0.15 kg of accelerator NS and 0.05 kg of accelerator DM, and the active agent is 0.6 kg of zinc oxide and 0.15 kg of stearic acid.

[0068] Comparative example 3 The comparative example is basically the same as example 1, except that the covering rubber in the comparative example comprises the following raw materials: natural rubber 10 kg, polydopamine modified carbon black 4.5 kg, vulcanizing agent 0.5 kg, active agent 0.75 kg and antioxidant 4010NA 0.1 kg, wherein the polydopamine modified carbon black is obtained by preparation example 12, the vulcanizing agent is 0.3 kg of sulfur, 0.15 kg of accelerator NS and 0.05 kg of accelerator DM, and the active agent is 0.6 kg of zinc oxide and 0.15 kg of stearic acid.

[0069] Performance detection Detection standard: Tensile strength test: the tensile strength of the conveyor belts prepared in examples 1-18 and comparative examples 1-3 was detected according to GB / T528-2009 "determination of tensile stress strain properties of vulcanized rubber or thermoplastic rubber", and the test results were recorded in table 1.

[0070] Abrasion resistance test: the abrasion volume of the conveyor belts prepared in examples 1-18 and comparative examples 1-3 was detected according to GB / T1689-2014 "test of abrasion resistance of vulcanized rubber (using Akron abrasion tester)", and the test results were recorded in table 1.

[0071] Table 1 performance detection data of high abrasion resistance and high strength conveyor belts in examples 1-18 and comparative examples 1-3

[0072] Referring to Table 1, combined with Example 1 and Comparative Examples 1-3, it can be seen that the rubber of the application is bonded with the polydopamine modified carbon black, and the surface of the modified carbon black can form physical anchoring with the rough structure of the surface of the rubber, and the amphoteric property of the polydopamine can promote the uniform dispersion of the carbon black in the rubber, through the synergistic effect of chemical bonding, physical embedding and dispersion optimization, the compatibility of the rubber and the carbon black is improved, and then the tensile properties and wear resistance of the prepared conveyor belt are improved.

[0073] Referring to Table 1, combined with Example 8, 10-13, it can be seen that the application uses a mixture of oxygen and argon gas for plasma treatment of rubber, which has better modification effect on rubber than single gas, and the prepared conveyor belt has better mechanical properties and wear resistance; wherein oxygen can introduce polar oxygen-containing groups on the surface of the rubber, enhancing the polar interaction with carbon black; argon gas as an inert gas mainly plays an etching role, increasing the roughness of the rubber surface, promoting the physical anchoring effect, so that the modified rubber and the polydopamine modified carbon black are combined through the combination mode of chemical bonding and physical anchoring, improving the combination of the two.

[0074] Referring to Table 1, combined with Example 14 and 16-18, it can be seen that the application first performs oxidation treatment before polydopamine modification of carbon black, which can introduce more carboxyl groups, significantly increasing the polarity of the carbon black surface, on the one hand, providing abundant reaction sites for subsequent polydopamine modification, ensuring that the polydopamine coating can be firmly anchored on the surface of the carbon black; on the other hand, after oxidation treatment combined with polydopamine modification, the surface polarity of the carbon black is highly matched with the polarity surface of the plasma treated rubber, greatly reducing the interfacial tension; at the same time, the polar groups of the polydopamine and the polar groups on the surface of the rubber can produce strong dipole interaction and electrostatic attraction, further enhancing interfacial adsorption, further improving the combination of the two, and improving the wear resistance and tensile strength of the prepared conveyor belt.

[0075] The specific embodiments are only an explanation of the application, which is not a limitation of the application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as it is within the scope of the claims of the application, it is protected by the patent law.

Claims

1. A high wear-resistant and high-strength conveyor belt, comprising a cover rubber and a skeleton layer, characterized in that: The covering rubber comprises the following raw materials in parts by weight: 100 parts of modified rubber, 45-55 parts of polydopamine modified carbon black, 4-5 parts of vulcanizing agent, 6.5-7.5 parts of activating agent and 1-2 parts of antioxidant; the modified rubber is plasma-treated rubber.

2. The high wear-resistant and high-strength conveyor belt according to claim 1, characterized in that: The preparation process of the modified rubber is as follows: placing the rubber into a plasma device, introducing gas, maintaining the pressure in the chamber at 40-60 Pa, setting the power at 80-100 W, and processing for 40-80 seconds.

3. The high wear-resistant and high-strength conveyor belt according to claim 2, characterized in that: The gas is a mixed gas of oxygen and argon in a volume ratio of (2-4): (6-8).

4. The high wear-resistant and high-strength conveyor belt according to claim 2, characterized in that: The rubber is a mixture of natural rubber and butadiene rubber in a mass ratio of (55-65): (35-45).

5. The high wear-resistant and high-strength conveyor belt according to claim 1, characterized in that: The preparation process of the polydopamine-modified carbon black comprises the following steps: (1) ultrasonically dispersing carbon black in deionized water to obtain a suspension; (2) adding the suspension into Tris-HCl buffer and adjusting the system pH to 8.0-8.5, adding dopamine monomer, reacting, washing, and drying to obtain polydopamine-modified carbon black; The mass ratio of the dopamine monomer to the carbon black is 1:(2-10).

6. The high wear-resistant and high-strength conveyor belt according to claim 5, characterized in that: The carbon black is further subjected to an oxidation treatment before being modified with polydopamine, specifically: carbon black is added to a nitric acid solution to form a mixture, heated to 60-100° C. under stirring, reacted for 2-6 hours, cooled to room temperature after the reaction, poured into deionized water, stirred and filtered, the filter cake is washed until the pH value of the filtrate is 5-7, the washed filter cake is placed at 80-100° C. under vacuum drying for 8-12 hours, and ground to obtain oxidized carbon black; The mass volume ratio of the carbon black: nitric acid solution is 1: (10-20) g / mL.

7. The high wear-resistant and high-strength conveyor belt according to claim 6, characterized in that: The carbon black is one of N110 carbon black, N220 carbon black, N330 carbon black and N550 carbon black.

8. The high wear-resistant and high-strength conveyor belt according to claim 1, characterized in that: The vulcanizing agent is a mixture of sulfur and an accelerator in a mass ratio of (2-3):2; the accelerator is an accelerator NS and an accelerator DM in a mass ratio of (2-3):(1-2).

9. The high wear-resistant and high-strength conveyor belt according to claim 1, characterized in that: The active agent is a mixture of zinc oxide and stearic acid in a mass ratio of (8-12): (3-5).

10. A process for preparing a high wear-resistant and high strength conveyor belt according to any one of claims 1 to 9, characterized in that: The steps include: Weighing the covering rubber raw materials according to the formula and mixing and kneading them to obtain a mixed rubber, refining the mixed rubber to obtain a film, and extruding the film to obtain a rubber compound; The adhesive is evenly coated on the surface of the steel wire rope core and then dried to obtain a skeleton layer; The rubber material and the skeleton layer are laminated to obtain a conveyor belt blank; The conveyor belt is vulcanized to obtain the conveyor belt.

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