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CN-116653383-B - Reinforced high-strength rubber V-shaped belt and preparation method thereof

CN116653383BCN 116653383 BCN116653383 BCN 116653383BCN-116653383-B

Abstract

The invention relates to the field of rubber V belts, in particular to an enhanced high-strength rubber V belt and a preparation method thereof, which are used for solving the problems of short service life and low mechanical strength of the conventional rubber V belt; the reinforced high-strength rubber V belt is of a sandwich structure with the rubber layer and the reinforcing layers being distributed in a crossed mode and embedded into each other, the embedding of the reinforcing layers is beneficial to improving the mechanical strength and fatigue resistance of the rubber V belt, the service life of the rubber V belt is prolonged, and the rubber layer and the reinforcing layers can be further tightly connected after the high-performance adhesive is used, so that the comprehensive performance of the rubber V belt is further enhanced.

Inventors

  • WANG SHAOHANG
  • DAI BINHUA
  • WU GUOMIAO

Assignees

  • 广德天鹏实业有限公司

Dates

Publication Date
20260508
Application Date
20230531

Claims (9)

  1. 1. The reinforced high-strength rubber V-shaped belt is characterized by comprising a rubber layer (1) and a reinforced layer (2), wherein the rubber layer (1) and the reinforced layer (2) are of a sandwich structure which is distributed in a crossing way and embedded into each other, and a high-performance adhesive is contained between the rubber layer (1) and the reinforced layer (2); The reinforcing layer is woven by modified fibers; The modified fiber is prepared by the following steps: Adding aramid fiber, lithium chloride and absolute ethyl alcohol into a three-neck flask with a stirrer and a thermometer, stirring and reacting for 3-5 hours at the temperature of 75-80 ℃ and the stirring speed of 300-400r/min, cooling the reaction product to room temperature after the reaction is finished, performing vacuum suction filtration, washing a filter cake with distilled water for 3-5 times, and then placing in a vacuum drying oven, and drying for 0.5-1 hour at the temperature of 95-100 ℃ to obtain pretreated fiber; Step A2, adding a silane coupling agent KH-560, graphene oxide and absolute ethyl alcohol into a three-neck flask provided with a stirrer and a thermometer, carrying out ultrasonic treatment for 20-30min under the condition of ultrasonic frequency of 25-30kHz, then adding a pretreatment fiber, continuing ultrasonic treatment for 20-30min, then stirring at the temperature of 45-50 ℃ and the stirring speed of 300-400r/min for reaction for 3-5h, cooling a reaction product to room temperature after the reaction is finished, carrying out vacuum suction filtration, washing a filter cake with distilled water for 3-5 times, then placing in a vacuum drying box, and drying for 0.5-1h under the condition of 95-100 ℃ to obtain a modified fiber; the high-performance adhesive is prepared by the following steps: Adding phthalic anhydride, 1-naphthol and methanesulfonic acid into a three-neck flask with a stirrer and a thermometer, stirring and reacting for 4-5 hours at the temperature of 15-20 ℃ and the stirring speed of 300-400r/min, heating to 40-45 ℃ and continuously stirring and reacting for 8-10 hours, cooling the reaction product to room temperature after the reaction is finished, adding the reaction product into absolute ethyl alcohol, adjusting the pH value to 7-7.5 by using sodium hydroxide solution, precipitating and filtering, and performing vacuum suction filtration to remove the solvent by rotary evaporation on the filtrate to obtain an intermediate 1; adding sodium hydroxide and deionized water into a three-neck flask with a stirrer and a thermometer, stirring at 25-30 ℃ and stirring speed of 300-400r/min for reacting for 20-30min, adding the intermediate 1 and zinc powder, heating to 65-70 ℃ for continuously stirring for reacting for 8-10h, cooling the reaction product to room temperature after the reaction is finished, vacuum-filtering, regulating the pH value of the filtrate to 2-3 by using a hydrochloric acid solution, precipitating precipitate, vacuum-filtering, washing the filter cake with distilled water for 3-5 times, and then placing in a vacuum drying box, and drying for 5-6h at 60-65 ℃ to obtain an intermediate 2; adding tertiary butanol, paraformaldehyde, anhydrous potassium carbonate, 2, 6-di-tertiary butylphenol and deionized water into a three-neck flask provided with a stirrer, a thermometer and an air duct, introducing nitrogen for protection, stirring and reacting for 20-30min under the conditions of 20-25 ℃ and 300-350r/min of stirring rate, then continuously stirring and reacting for 4-5h under the conditions of heating to 65-70 ℃, cooling the reaction product to room temperature after the reaction is finished, then carrying out vacuum suction filtration, rotationally evaporating the filtrate to remove the solvent, and then recrystallizing with n-hexane to obtain an intermediate 3; Step B4, adding the intermediate 2, the intermediate 3, the p-toluenesulfonic acid and methylene dichloride into a three-neck flask provided with a stirrer, a thermometer, an air duct and a reflux condenser, introducing nitrogen for protection, stirring and reacting for 10-15min under the conditions of 25-30 ℃ and 300-400r/min of stirring rate, heating to reflux, continuing stirring and reacting for 3-5h, cooling the reaction product to room temperature after the reaction, and then rotationally evaporating to remove the solvent to obtain an intermediate 4; Step B5, adding the intermediate 4 and epichlorohydrin into a three-neck flask provided with a stirrer, a thermometer, an air duct and a constant pressure dropping funnel, dropwise adding sodium hydroxide solution while stirring at the temperature of 95-100 ℃ and the stirring rate of 300-400r/min, controlling the dripping rate to be 1-2 drops/s, continuing stirring for reaction for 8-10h after the dripping is finished, cooling the reaction product to room temperature, then vacuum filtering, pouring the filtrate into toluene, washing with distilled water to be neutral, standing for layering, rotationally evaporating an organic phase to remove the solvent, and then placing in a vacuum drying oven, and drying for 5-6h at the temperature of 60-65 ℃ to obtain the high-performance resin; And B6, adding the high-performance resin, the diluent, the curing agent and the absolute ethyl alcohol into a three-neck flask with a stirrer and a thermometer, stirring and reacting for 1-1.5h under the conditions that the temperature is 55-60 ℃ and the stirring speed is 300-400r/min, and cooling the reaction product to room temperature after the reaction is finished to obtain the high-performance adhesive.
  2. 2. The reinforced high-strength rubber V-belt according to claim 1, wherein the dosage ratio of the aramid fiber, the lithium chloride and the absolute ethyl alcohol in the step A1 is 10g:8-10g:100-120mL, and the dosage ratio of the silane coupling agent KH-560, the graphene oxide, the absolute ethyl alcohol and the pretreatment fiber in the step A2 is 8-10g:1.5-2.5g:100-120mL:10g.
  3. 3. The reinforced high-strength rubber V-belt according to claim 1, wherein the phthalic anhydride, 1-naphthol and methanesulfonic acid in step B1 are used in a ratio of 0.1mol:0.2mol:120-150mL, and the mass fraction of the sodium hydroxide solution is 25-30%.
  4. 4. The reinforced high-strength rubber V belt according to claim 1, wherein the dosage ratio of the sodium hydroxide, the deionized water, the intermediate 1 and the zinc powder in the step B2 is 0.15-0.2mol:100-120mL:10mmol:0.5-0.8g, and the mass fraction of the hydrochloric acid solution is 15-20%.
  5. 5. The reinforced high strength rubber V-belt according to claim 1, wherein the t-butanol, paraformaldehyde, anhydrous potassium carbonate, 2, 6-di-t-butylphenol and deionized water are used in the ratio of 45-50ml:2.8-3g:0.15-0.2g:25-30mmol:15-20mL in step B3.
  6. 6. The reinforced high-strength rubber V-belt according to claim 1, wherein the intermediate 2, intermediate 3, p-toluenesulfonic acid and methylene chloride in step B4 are used in a ratio of 10mmol:10mmol:0.25-0.4g:60-80mL.
  7. 7. The reinforced high-strength rubber V-belt according to claim 1, wherein the intermediate 4, epichlorohydrin and sodium hydroxide solution in step B5 are used in a ratio of 10mmol:80-100mmol:25-30mL, and the mass fraction of the sodium hydroxide solution is 30-35%.
  8. 8. The reinforced high-strength rubber V-belt according to claim 1, wherein the high-performance resin, the diluent, the curing agent and the absolute ethanol in step B6 are used in an amount ratio of 10g:1.5-4g:4-5g:20-30mL, the diluent is epoxy diluent 669, and the curing agent is T-31 curing agent.
  9. 9. A process for preparing a reinforced high strength rubber V-belt according to any one of claims 1-8, comprising the steps of: Step one, weaving modified fibers into fiber cloth with the thickness of 0.5-1mm to form a reinforcing layer (2); uniformly mixing natural rubber and styrene-butadiene rubber according to the mass ratio of 20-25:10-15, extruding into a strip shape, and vulcanizing to obtain a rubber layer (1) with the thickness of 2-3 mm; Uniformly coating high-performance adhesives on the surfaces of two sides of the reinforcing layer (2), adhering the rubber layers (1) on the two sides to form composite belts which are respectively the rubber layers (1), the reinforcing layer (2), the rubber layers (1), the reinforcing layer (2) and the rubber layers (1) from top to bottom, and then rolling and shaping the composite belts; and fourthly, cutting the rolled and shaped composite belt to form a V-belt shape, and putting the V-belt into a vulcanizing tank for vulcanizing treatment to obtain the reinforced high-strength rubber V-belt.

Description

Reinforced high-strength rubber V-shaped belt and preparation method thereof Technical Field The invention relates to the field of rubber V belts, in particular to an enhanced high-strength rubber V belt and a preparation method thereof. Background A drive belt is a mechanical device for transmitting power from one rotating shaft to another. Rubber V-belts are commonly used in a variety of applications such as household appliances, automobiles, agricultural machinery, construction equipment, and the like. However, the conventional rubber V-belt has problems such as easy breakage, short service life, low mechanical strength, etc. during long-term use. Therefore, there is a need to develop a new type of reinforced high strength rubber V-belt to meet the market demands for high strength and long service life. Disclosure of Invention In order to overcome the technical problems, the invention aims to provide a reinforced high-strength rubber V belt and a preparation method thereof, wherein a reinforced layer is formed by weaving modified fibers into fiber cloth, natural rubber and styrene-butadiene rubber are uniformly mixed, then extruded into a belt shape, vulcanized to obtain a rubber layer, high-performance adhesives are uniformly coated on the surfaces of two sides of the reinforced layer, then the rubber layers are adhered on the two sides to form a composite belt which is respectively provided with the rubber layer, the reinforced layer, the rubber layer, the reinforced layer and the rubber layer from top to bottom, the composite belt is rolled and shaped, the rolled and shaped composite belt is cut into a V belt shape, and the V belt is placed into a vulcanizing tank for vulcanization to obtain the reinforced high-strength rubber V belt, so that the problems of short service life and low mechanical strength of the conventional rubber V belt are solved. The aim of the invention can be achieved by the following technical scheme: The reinforced high-strength rubber V-shaped belt comprises a rubber layer and a reinforcing layer, wherein the rubber layer and the reinforcing layer are in a sandwich structure which is distributed in a crossing way and embedded into each other, and a high-performance adhesive is contained between the rubber layer and the reinforcing layer; The reinforcing layer is woven by modified fibers; The modified fiber is prepared by the following steps: Adding aramid fiber, lithium chloride and absolute ethyl alcohol into a three-neck flask with a stirrer and a thermometer, stirring and reacting for 3-5 hours under the conditions of 75-80 ℃ and stirring speed of 300-400 r/min, cooling a reaction product to room temperature after the reaction is finished, vacuum filtering, washing a filter cake with distilled water for 3-5 times, and then placing in a vacuum drying box, and drying for 0.5-1 hour under the conditions of 95-100 ℃ to obtain pretreated fiber; And A2, adding a silane coupling agent KH-560, graphene oxide and absolute ethyl alcohol into a three-neck flask provided with a stirrer and a thermometer, carrying out ultrasonic treatment on the mixture at an ultrasonic frequency of 25-30kHz for 20-30 min, adding a pretreated fiber, continuing to carry out ultrasonic treatment on the mixture for 20-30 min, carrying out stirring reaction for 3-5h at a temperature of 45-50 ℃ and a stirring rate of 300-400 r/min, cooling a reaction product to room temperature after the reaction is finished, carrying out vacuum suction filtration, washing a filter cake with distilled water for 3-5 times, and then placing the filter cake in a vacuum drying box, and drying the filter cake at a temperature of 95-100 ℃ for 0.5-1h to obtain the modified fiber. According to a further scheme of the invention, the dosage ratio of the aramid fiber to the lithium chloride to the absolute ethyl alcohol in the step A1 is 10g:8-10g:100-120mL. According to a further scheme of the invention, the dosage ratio of the silane coupling agent KH-560, graphene oxide, absolute ethyl alcohol and the pretreated fiber in the step A2 is 8-10g:1.5-2.5g:100-120mL:10g. As a further scheme of the invention, the high-performance adhesive is prepared by the following steps: Adding phthalic anhydride, 1-naphthol and methanesulfonic acid into a three-neck flask with a stirrer and a thermometer, stirring and reacting for 4-5 hours at the temperature of 15-20 ℃ and the stirring speed of 300-400 r/min, heating to 40-45 ℃ and continuously stirring and reacting for 8-10 hours, cooling the reaction product to room temperature after the reaction is finished, adding the reaction product into absolute ethyl alcohol, adjusting the pH value to 7-7.5 by using sodium hydroxide solution, precipitating and filtering, vacuum suction filtering, and rotationally evaporating the filtrate to remove the solvent to obtain an intermediate 1; The reaction principle is as follows: Adding sodium hydroxide and deionized water into a three-neck flask with a stirrer and