An enhanced high strength rubber v belt and a method of making the same

Abstract

The application relates to the field of rubber V-belts, in particular to a reinforced high-strength rubber V-belt and a preparation method thereof, which are used to solve the problems of short service life and low mechanical strength of existing rubber V-belts; the reinforced high-strength rubber V-belt is in a sandwich structure of cross distribution and mutual embedding of a rubber layer and a reinforcing layer; the embedding of the reinforcing layer is beneficial to improving the mechanical strength and fatigue resistance of the rubber V-belt and prolonging the service life of the rubber V-belt; and after high-performance adhesive is used, the connection between the rubber layer and the reinforcing layer can be further tightened, and the comprehensive performance of the rubber V-belt is further enhanced.

Description

Technical Field

[0001] This invention relates to the field of rubber V-belts, and more specifically to a reinforced high-strength rubber V-belt and its preparation method. Background Technology

[0002] A drive belt is a mechanical device used to transmit power from one rotating shaft to another. Rubber V-belts are commonly used in various applications, such as household appliances, automobiles, agricultural machinery, and construction facilities. However, existing rubber V-belts have problems during long-term use, such as easy breakage, short service life, and low mechanical strength. Therefore, there is a need to develop a new type of reinforced high-strength rubber V-belt to meet the market demand for high strength and long service life. Summary of the Invention

[0003] To overcome the aforementioned technical problems, the present invention aims to provide an enhanced high-strength rubber V-belt and its preparation method: Modified fibers are woven into a fiber cloth to form a reinforcing layer; natural rubber and styrene-butadiene rubber are mixed uniformly, then extruded into a belt shape and vulcanized to obtain a rubber layer; a high-performance adhesive is uniformly coated on both sides of the reinforcing layer, and then rubber layers are adhered to both sides, forming a composite belt consisting of a rubber layer, a reinforcing layer, a rubber layer, a reinforcing layer, and another rubber layer from top to bottom; the composite belt is then roll-formed and shaped; the roll-formed composite belt is cut into a V-belt shape; and the V-belt is placed in a vulcanizing tank for vulcanization treatment to obtain the enhanced high-strength rubber V-belt, thus solving the problems of short service life and low mechanical strength of existing rubber V-belts.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A reinforced high-strength rubber V-belt includes a rubber layer and a reinforcing layer, wherein the rubber layer and the reinforcing layer are cross-distributed and interlocked sandwich structures, and a high-performance adhesive is contained between the rubber layer and the reinforcing layer.

[0006] The reinforcing layer is woven from modified fibers;

[0007] The modified fiber is prepared by the following steps:

[0008] Step A1: Add aramid fiber, lithium chloride and anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Stir the reaction at 75-80℃ and a stirring rate of 300-400 r / min for 3-5 h. After the reaction is completed, cool the reaction product to room temperature, then filter it under vacuum. Wash the filter cake with distilled water 3-5 times, then place it in a vacuum drying oven and dry it at 95-100℃ for 0.5-1 h to obtain pretreated fiber.

[0009] Step A2: Add silane coupling agent KH-560, graphene oxide, and anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Sonicate the mixture at a frequency of 25-30 kHz for 20-30 min. Then add the pretreated fiber and continue sonication for 20-30 min. Afterward, stir the mixture at a temperature of 45-50℃ and a stirring rate of 300-400 r / min for 3-5 h. After the reaction is complete, cool the reaction product to room temperature, then vacuum filter it. Wash the filter cake with distilled water 3-5 times, then place it in a vacuum drying oven and dry it at a temperature of 95-100℃ for 0.5-1 h to obtain the modified fiber.

[0010] As a further aspect of the present invention: the ratio of aramid fiber, lithium chloride and anhydrous ethanol used in step A1 is 10g:8-10g:100-120mL.

[0011] As a further aspect of the present invention: the ratio of the amount of silane coupling agent KH-560, graphene oxide, anhydrous ethanol and pretreated fiber in step A2 is 8-10g: 1.5-2.5g: 100-120mL: 10g.

[0012] As a further aspect of the present invention: the high-performance adhesive is prepared by the following steps:

[0013] Step B1: Phthalic anhydride, 1-naphthol, and methanesulfonic acid were added to a three-necked flask equipped with a stirrer and a thermometer. The mixture was stirred at 15-20°C for 4-5 hours, and then stirred at 40-45°C for another 8-10 hours. After the reaction was completed, the product was cooled to room temperature and then added to anhydrous ethanol. The pH was then adjusted to 7-7.5 with sodium hydroxide solution to precipitate the product. The product was then filtered under vacuum, and the solvent was removed by rotary evaporation to obtain intermediate 1.

[0014] The reaction principle is as follows:

[0015]

[0016] Step B2: Add sodium hydroxide and deionized water to a three-necked flask equipped with a stirrer and thermometer. Stir the reaction at 25-30℃ and a stirring rate of 300-400 r / min for 20-30 min. Then add intermediate 1 and zinc powder. Continue stirring the reaction at 65-70℃ for 8-10 h. After the reaction is complete, cool the reaction product to room temperature and then filter it under vacuum. Adjust the pH of the filtrate to 2-3 with hydrochloric acid solution to precipitate the precipitate. Filter the precipitate under vacuum and wash the filter cake 3-5 times with distilled water. Then place it in a vacuum drying oven and dry it at 60-65℃ for 5-6 h to obtain intermediate 2.

[0017] The reaction principle is as follows:

[0018]

[0019] Step B3: Add tert-butanol, paraformaldehyde, anhydrous potassium carbonate, 2,6-di-tert-butylphenol, and deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir the reaction at 20-25°C and a stirring rate of 300-350 r / min for 20-30 min. Then raise the temperature to 65-70°C and continue stirring for 4-5 h. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Remove the solvent by rotary evaporation of the filtrate, and then recrystallize with n-hexane to obtain intermediate 3.

[0020] The reaction principle is as follows:

[0021]

[0022] Step B4: Intermediate 2, intermediate 3, p-toluenesulfonic acid, and dichloromethane are added to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube, and reflux condenser. Nitrogen gas is introduced for protection. The mixture is stirred for 10-15 minutes at a temperature of 25-30°C and a stirring rate of 300-400 r / min. Then, the mixture is heated to reflux and stirred for another 3-5 hours. After the reaction is completed, the reaction product is cooled to room temperature and the solvent is removed by rotary evaporation to obtain intermediate 4.

[0023] The reaction principle is as follows:

[0024]

[0025] Step B5: Add intermediate 4 and epichlorohydrin to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube, and constant pressure dropping funnel. While stirring at 95-100℃ and a stirring rate of 300-400 r / min, add sodium hydroxide solution dropwise, controlling the dropping rate to 1-2 drops / s. After the addition is complete, continue stirring for 8-10 hours. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Pour the filtrate into toluene, wash with distilled water until neutral, and allow to stand for separation. Remove the solvent by rotary evaporation of the organic phase, and then place it in a vacuum drying oven at 60-65℃ for 5-6 hours to obtain the high-performance resin.

[0026] The reaction principle is as follows:

[0027]

[0028] Step B6: Add the high-performance resin, diluent, curing agent and anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Stir the mixture at 55-60℃ and a stirring rate of 300-400 r / min for 1-1.5 h. After the reaction is complete, cool the reaction product to room temperature to obtain the high-performance adhesive.

[0029] As a further aspect of the present invention: the ratio of phthalic anhydride, 1-naphthol and methanesulfonic acid used in step B1 is 0.1 mol: 0.2 mol: 120-150 mL, and the mass fraction of the sodium hydroxide solution is 25-30%.

[0030] As a further aspect of the present invention: the ratio of sodium hydroxide, deionized water, intermediate 1 and zinc powder in step B2 is 0.15-0.2 mol: 100-120 mL: 10 mmol: 0.5-0.8 g, and the mass fraction of the hydrochloric acid solution is 15-20%.

[0031] As a further aspect of the present invention: the ratio of tert-butanol, paraformaldehyde, anhydrous potassium carbonate, 2,6-di-tert-butylphenol and deionized water in step B3 is 45-50 mL: 2.8-3 g: 0.15-0.2 g: 25-30 mmol: 15-20 mL.

[0032] As a further aspect of the present invention: the ratio of intermediate 2, intermediate 3, p-toluenesulfonic acid and dichloromethane in step B4 is 10 mmol: 10 mmol: 0.25-0.4 g: 60-80 mL.

[0033] As a further aspect of the present invention: the ratio of intermediate 4, epichlorohydrin and sodium hydroxide solution in step B5 is 10 mmol: 80-100 mmol: 25-30 mL, and the mass fraction of the sodium hydroxide solution is 30-35%.

[0034] As a further aspect of the present invention: the ratio of the high-performance resin, diluent, curing agent and anhydrous ethanol in step B6 is 10g:1.5-4g:4-5g:20-30mL, wherein the diluent is epoxy diluent 669 and the curing agent is T-31 curing agent.

[0035] As a further aspect of the present invention: a method for preparing a reinforced high-strength rubber V-belt, comprising the following steps:

[0036] Step 1: Weave the modified fibers into a fiber cloth with a thickness of 0.5-1mm to form a reinforcing layer;

[0037] Step 2: Mix natural rubber and styrene-butadiene rubber evenly at a mass ratio of 20-25:10-15, then extrude into strips and vulcanize to obtain a rubber layer with a thickness of 2-3 mm.

[0038] Step 3: Apply high-performance adhesive evenly to both sides of the reinforcing layer, and then adhere the rubber layer to both sides to form a composite strip consisting of rubber layer, reinforcing layer, rubber layer, reinforcing layer, and rubber layer from top to bottom. Then roll the composite strip to shape it.

[0039] Step 4: Cut the rolled composite belt into a V-belt shape and place the V-belt into a vulcanizing tank for vulcanization treatment to obtain the reinforced high-strength rubber V-belt.

[0040] The beneficial effects of this invention are:

[0041] This invention discloses an enhanced high-strength rubber V-belt and its preparation method. The method involves weaving modified fibers into a fiber cloth to form a reinforcing layer. Natural rubber and styrene-butadiene rubber are mixed uniformly, extruded into a belt, and vulcanized to obtain a rubber layer. A high-performance adhesive is uniformly coated onto both sides of the reinforcing layer, and then the rubber layer is adhered to both sides, forming a composite belt consisting of a rubber layer, a reinforcing layer, another rubber layer, another reinforcing layer, and another rubber layer from top to bottom. The composite belt is then roll-formed and shaped, cut into a V-belt shape, and placed in a vulcanizing tank for vulcanization treatment to obtain the enhanced high-strength rubber V-belt. This enhanced high-strength rubber V-belt has a sandwich structure with rubber layers and reinforcing layers interleaved and embedded. The embedding of the reinforcing layers helps improve the mechanical strength and fatigue resistance of the rubber V-belt and extends its service life. The use of high-performance adhesive further strengthens the bond between the rubber layer and the reinforcing layer, further enhancing its overall performance.

[0042] In the preparation of reinforced high-strength rubber V-belts, a modified fiber was first prepared. Firstly, aramid fibers were treated with lithium chloride to break the hydrogen bonds between the aramid fiber molecular chains through a complexation reaction, making it easier for the aramid fibers to be grafted with a silane coupling agent. Then, graphene oxide was attached to the surface of the grafted aramid fibers, forming a rough interface layer that increased the bonding force between the aramid fibers and the rubber, thereby reinforcing the rubber V-belt. Aramid fiber is a high-performance organic fiber with high strength, high modulus, and light weight; its tensile strength is 5-6 times that of steel wire. After modification with silane coupling agents and graphene oxide, the interfacial properties between the aramid fiber and the rubber matrix are improved, effectively enhancing the mechanical properties of the rubber matrix. Simultaneously, graphene oxide further enhances its mechanical properties.

[0043] In the process of preparing reinforced high-strength rubber V-belts, a high-performance adhesive was also prepared. First, phthalic anhydride and 1-naphthol were reacted to generate intermediate 1. Then, intermediate 1 was reduced to generate intermediate 2. Subsequently, paraformaldehyde and 2,6-di-tert-butylphenol were reacted to form benzyl alcohol, yielding intermediate 3. Then, the carboxyl group on intermediate 2 and the alcohol hydroxyl group on intermediate 3 were esterified to obtain intermediate 4. Then, intermediate 4 was reacted with epichlorohydrin to form epoxy resin, resulting in a high-performance resin. The high-performance adhesive was then prepared using the high-performance resin, diluent, curing agent, and anhydrous ethanol as raw materials. The structure of this high-performance resin contains a large number of benzene rings and hindered phenolic functional groups. The benzene rings have high stiffness and strong stability, which can endow it with good mechanical strength, while the hindered phenolic functional groups give it good antioxidant properties, which can inhibit the flexural fatigue of the rubber V-belt, avoid the aging of the rubber V-belt and the performance degradation, thereby enabling the rubber V-belt to maintain high strength for a long time and have a long service life. Attached Figure Description

[0044] The invention will now be further described with reference to the accompanying drawings.

[0045] Figure 1 This is a schematic diagram of the structure of the reinforced high-strength rubber V-belt in this invention. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0047] Example 1:

[0048] This embodiment describes a method for preparing a high-performance adhesive, comprising the following steps:

[0049] Step B1: 0.1 mol phthalic anhydride, 0.2 mol 1-naphthol, and 120 mL methanesulfonic acid were added to a three-necked flask equipped with a stirrer and a thermometer. The mixture was stirred at 15 °C for 4 h at a stirring rate of 300 r / min. After that, the mixture was heated to 40 °C and stirred for another 8 h. After the reaction was completed, the product was cooled to room temperature and then added to anhydrous ethanol. The pH was then adjusted to 7 with a 25% sodium hydroxide solution to precipitate the product. The product was then filtered under vacuum and the solvent was removed by rotary evaporation to obtain intermediate 1.

[0050] Step B2: Add 0.15 mol sodium hydroxide and 100 mL deionized water to a three-necked flask equipped with a stirrer and thermometer. Stir the reaction at 25 °C and a stirring rate of 300 r / min for 20 min. Then add 10 mmol of intermediate 1 and 0.5 g of zinc powder. Continue stirring at 65 °C for 8 h. After the reaction is complete, cool the reaction product to room temperature and then filter it under vacuum. Adjust the pH of the filtrate to 2 with 15% hydrochloric acid solution to precipitate the precipitate. Filter the precipitate under vacuum and wash the filter cake three times with distilled water. Then place it in a vacuum drying oven and dry it at 60 °C for 5 h to obtain intermediate 2.

[0051] Step B3: Add 45 mL of tert-butanol, 2.8 g of paraformaldehyde, 0.15 g of anhydrous potassium carbonate, 25 mmol of 2,6-di-tert-butylphenol, and 15 mL of deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir at 20 °C and a stirring rate of 300 r / min for 20 min. Then raise the temperature to 65 °C and continue stirring for 4 h. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Remove the solvent by rotary evaporation of the filtrate, and then recrystallize with n-hexane to obtain intermediate 3.

[0052] Step B4: Add 10 mmol of intermediate 2, 10 mmol of intermediate 3, 0.25 g of p-toluenesulfonic acid and 60 mL of dichloromethane to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube and reflux condenser. Purge with nitrogen and stir for 10 min at 25 °C and 300 r / min. Then heat to reflux and continue stirring for 3 h. After the reaction is complete, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain intermediate 4.

[0053] Step B5: Add 10 mmol of intermediate 4 and 80 mmol of epichlorohydrin to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube, and constant pressure dropping funnel. While stirring at 95°C and a stirring rate of 300 r / min, add 25 mL of 30% sodium hydroxide solution dropwise, controlling the dropping rate to 1 drop / s. After the addition is complete, continue stirring for 8 hours. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Pour the filtrate into toluene, wash with distilled water until neutral, and allow to stand for separation. Remove the solvent by rotary evaporation of the organic phase, and then place it in a vacuum drying oven at 60°C for 5 hours to obtain the high-performance resin.

[0054] Step B6: Add 10g of high-performance resin, 1.5g of epoxy diluent 669, 4g of T-31 curing agent and 20mL of anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Stir and react for 1 hour at a temperature of 55℃ and a stirring rate of 300r / min. After the reaction is completed, cool the reaction product to room temperature to obtain a high-performance adhesive.

[0055] Example 2:

[0056] This embodiment describes a method for preparing a high-performance adhesive, comprising the following steps:

[0057] Step B1: 0.1 mol phthalic anhydride, 0.2 mol 1-naphthol, and 150 mL methanesulfonic acid were added to a three-necked flask equipped with a stirrer and thermometer. The mixture was stirred at 20 °C and a stirring rate of 400 r / min for 5 h. After that, the temperature was raised to 45 °C and the mixture was stirred for another 10 h. After the reaction was completed, the reaction product was cooled to room temperature and then added to anhydrous ethanol. The pH was then adjusted to 7.5 with a 30% sodium hydroxide solution to precipitate the product. The product was then filtered under vacuum and the solvent was removed by rotary evaporation to obtain intermediate 1.

[0058] Step B2: Add 0.2 mol sodium hydroxide and 120 mL deionized water to a three-necked flask equipped with a stirrer and thermometer. Stir the mixture at 30 °C and a stirring rate of 400 r / min for 30 min. Then add 10 mmol intermediate 1 and 0.8 g zinc powder. Continue stirring at 70 °C for 10 h. After the reaction is complete, cool the reaction product to room temperature and then filter it under vacuum. Adjust the pH of the filtrate to 3 with a 20% hydrochloric acid solution to precipitate the precipitate. Filter the precipitate under vacuum and wash the filter cake 5 times with distilled water. Then place it in a vacuum drying oven and dry it at 65 °C for 6 h to obtain intermediate 2.

[0059] Step B3: Add 50 mL of tert-butanol, 3 g of paraformaldehyde, 0.2 g of anhydrous potassium carbonate, 30 mmol of 2,6-di-tert-butylphenol, and 20 mL of deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir at 25 °C and a stirring rate of 350 r / min for 30 min. Then, raise the temperature to 70 °C and continue stirring for 5 h. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Remove the solvent by rotary evaporation of the filtrate, and then recrystallize with n-hexane to obtain intermediate 3.

[0060] Step B4: Add 10 mmol of intermediate 2, 10 mmol of intermediate 3, 0.4 g of p-toluenesulfonic acid and 80 mL of dichloromethane to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube and reflux condenser. Purge with nitrogen and stir for 15 min at 30 °C and 400 r / min. Then heat to reflux and continue stirring for 5 h. After the reaction is complete, cool the reaction product to room temperature and then remove the solvent by rotary evaporation to obtain intermediate 4.

[0061] Step B5: Add 10 mmol of intermediate 4 and 100 mmol of epichlorohydrin to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube, and constant pressure dropping funnel. While stirring at 100°C and a stirring rate of 400 r / min, add 30 mL of 35% sodium hydroxide solution dropwise, controlling the dropping rate to 2 drops / s. After the addition is complete, continue stirring for 10 h. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Pour the filtrate into toluene, wash with distilled water until neutral, and allow to stand for separation. Remove the solvent by rotary evaporation of the organic phase, and then place it in a vacuum drying oven at 65°C for 6 h to obtain the high-performance resin.

[0062] Step B6: Add 10g of high-performance resin, 4g of epoxy diluent 669, 5g of T-31 curing agent and 30mL of anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Stir and react for 1.5h at a temperature of 60℃ and a stirring rate of 400r / min. After the reaction is completed, cool the reaction product to room temperature to obtain a high-performance adhesive.

[0063] Example 3:

[0064] Please see Figure 1 As shown, this embodiment is a method for preparing an enhanced high-strength rubber V-belt, including the following steps:

[0065] Step A1: Add 10g of aramid fiber, 8g of lithium chloride and 100mL of anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Stir the mixture at 75℃ and a stirring rate of 300r / min for 3h. After the reaction is complete, cool the reaction product to room temperature, then filter it under vacuum. Wash the filter cake three times with distilled water, and then place it in a vacuum drying oven and dry it at 95℃ for 0.5h to obtain pretreated fiber.

[0066] Step A2: Add 8g of silane coupling agent KH-560, 1.5g of graphene oxide and 100mL of anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Sonicate at 25kHz for 20 min. Then add 10g of pretreated fiber and sonicate for another 20 min. Stir the reaction at 45℃ and 300r / min for 3 h. After the reaction is complete, cool the reaction product to room temperature and then vacuum filter. Wash the filter cake three times with distilled water and then place it in a vacuum drying oven and dry at 95℃ for 0.5 h to obtain modified fiber.

[0067] Step A3: Weave the modified fibers into a fiber cloth with a thickness of 0.5 mm to form the reinforcing layer 2;

[0068] Step A4: Mix natural rubber and styrene-butadiene rubber evenly at a mass ratio of 20:10, then extrude them into strips and vulcanize them to obtain a rubber layer 1 with a thickness of 2mm;

[0069] Step A5: The high-performance adhesive in Example 1 is evenly coated on both sides of the reinforcing layer 2, and then the rubber layer 1 is adhered to both sides to form a composite tape consisting of rubber layer 1, reinforcing layer 2, rubber layer 1, reinforcing layer 2, and rubber layer 1 from top to bottom. The composite tape is then rolled and shaped.

[0070] Step A6: Cut the rolled composite belt into a V-belt shape and place the V-belt into a vulcanizing tank for vulcanization treatment to obtain the reinforced high-strength rubber V-belt.

[0071] Example 4:

[0072] Please see Figure 1 As shown, this embodiment is a method for preparing an enhanced high-strength rubber V-belt, including the following steps:

[0073] Step A1: Add 10g of aramid fiber, 10g of lithium chloride and 120mL of anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Stir and react for 5h at 80℃ and 400r / min. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Wash the filter cake 5 times with distilled water, then place it in a vacuum drying oven and dry it for 1h at 100℃ to obtain pretreated fiber.

[0074] Step A2: Add 10g of silane coupling agent KH-560, 2.5g of graphene oxide and 120mL of anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Sonicate at 30kHz for 30min. Then add 10g of pretreated fiber and sonicate for another 30min. Stir the reaction at 50℃ and 400r / min for 5h. After the reaction is complete, cool the reaction product to room temperature and then vacuum filter. Wash the filter cake 5 times with distilled water and then place it in a vacuum drying oven and dry at 100℃ for 1h to obtain modified fiber.

[0075] Step A3: Weave the modified fibers into a 1mm thick fiber cloth to form the reinforcing layer 2;

[0076] Step A4: Mix natural rubber and styrene-butadiene rubber evenly at a mass ratio of 25:15, then extrude them into strips and vulcanize them to obtain a rubber layer 1 with a thickness of 3mm;

[0077] Step A5: The high-performance adhesive in Example 2 is evenly coated on both sides of the reinforcing layer 2, and then the rubber layer 1 is adhered to both sides to form a composite tape consisting of rubber layer 1, reinforcing layer 2, rubber layer 1, reinforcing layer 2, and rubber layer 1 from top to bottom. The composite tape is then rolled and shaped.

[0078] Step A6: Cut the rolled composite belt into a V-belt shape and place the V-belt into a vulcanizing tank for vulcanization treatment to obtain the reinforced high-strength rubber V-belt.

[0079] Comparative Example 1

[0080] The difference between this comparative example and Example 4 is that the high-strength rubber V-belt is made directly from natural rubber and styrene-butadiene rubber.

[0081] Comparative Example 2

[0082] The difference between this comparative example and Example 4 is that no high-performance adhesive is added, and the reinforcing layer and rubber layer are directly hot-pressed and composited.

[0083] Comparative Example 3

[0084] The difference between this comparative example and Example 4 is that the high-performance adhesive made of epoxy resin E44 is used instead of the high-performance resin.

[0085] The reinforced high-strength rubber V-belts from Examples 3-4 and Comparative Examples 1-3 were subjected to performance tests, and the test results are shown in the table below:

[0086]

[0087] Referring to the data in the table above, and based on the comparison of Examples 3-4 and Comparative Examples 1-3, it can be seen that adding a reinforcing layer and using a high-performance adhesive made with high-performance resin can effectively increase the mechanical strength and fatigue resistance of rubber V-belts.

[0088] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A reinforced high-strength rubber V-belt, characterized in that, It includes a rubber layer (1) and a reinforcing layer (2), wherein the rubber layer (1) and the reinforcing layer (2) are cross-distributed and inter-embedded sandwich structures, and a high-performance adhesive is contained between the rubber layer (1) and the reinforcing layer (2); The reinforcing layer is woven from modified fibers; The modified fiber is prepared by the following steps: Step A1: Add aramid fiber, lithium chloride and anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Stir the reaction at 75-80℃ and 300-400 r / min for 3-5 h. After the reaction is complete, cool the reaction product to room temperature, then filter it under vacuum. Wash the filter cake with distilled water 3-5 times, then place it in a vacuum drying oven and dry it at 95-100℃ for 0.5-1 h to obtain pretreated fiber. Step A2: Add silane coupling agent KH-560, graphene oxide, and anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Sonicate at a frequency of 25-30 kHz for 20-30 min. Then add the pretreated fiber and continue sonication for 20-30 min. Stir the reaction at a temperature of 45-50℃ and a stirring rate of 300-400 r / min for 3-5 h. After the reaction is complete, cool the reaction product to room temperature, then vacuum filter it. Wash the filter cake with distilled water 3-5 times, then place it in a vacuum drying oven and dry it at a temperature of 95-100℃ for 0.5-1 h to obtain the modified fiber. The high-performance adhesive is prepared by the following steps: Step B1: Phthalic anhydride, 1-naphthol, and methanesulfonic acid were added to a three-necked flask equipped with a stirrer and a thermometer. The mixture was stirred at 15-20°C for 4-5 hours, and then stirred at 40-45°C for another 8-10 hours. After the reaction was completed, the product was cooled to room temperature and then added to anhydrous ethanol. The pH was then adjusted to 7-7.5 with sodium hydroxide solution to precipitate the product. The product was then filtered under vacuum, and the solvent was removed by rotary evaporation to obtain intermediate 1. Step B2: Add sodium hydroxide and deionized water to a three-necked flask equipped with a stirrer and thermometer. Stir the reaction at 25-30℃ and 300-400 r / min for 20-30 min. Then add intermediate 1 and zinc powder. Continue stirring the reaction at 65-70℃ for 8-10 h. After the reaction is complete, cool the reaction product to room temperature and then filter it under vacuum. Adjust the pH of the filtrate to 2-3 with hydrochloric acid solution to precipitate the precipitate. Filter the precipitate under vacuum and wash the filter cake 3-5 times with distilled water. Then place it in a vacuum drying oven and dry it at 60-65℃ for 5-6 h to obtain intermediate 2. Step B3: Add tert-butanol, paraformaldehyde, anhydrous potassium carbonate, 2,6-di-tert-butylphenol, and deionized water to a three-necked flask equipped with a stirrer, thermometer, and gas delivery tube. Purge with nitrogen for protection and stir the reaction at 20-25°C and 300-350 r / min for 20-30 min. Then raise the temperature to 65-70°C and continue stirring for 4-5 h. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Remove the solvent by rotary evaporation of the filtrate, and then recrystallize with n-hexane to obtain intermediate 3. Step B4: Intermediate 2, intermediate 3, p-toluenesulfonic acid, and dichloromethane are added to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube, and reflux condenser. Nitrogen gas is introduced for protection. The mixture is stirred for 10-15 minutes at a temperature of 25-30°C and a stirring rate of 300-400 r / min. Then, the mixture is heated to reflux and stirred for another 3-5 hours. After the reaction is completed, the reaction product is cooled to room temperature and the solvent is removed by rotary evaporation to obtain intermediate 4. Step B5: Add intermediate 4 and epichlorohydrin to a three-necked flask equipped with a stirrer, thermometer, gas delivery tube, and constant pressure dropping funnel. While stirring at 95-100℃ and a stirring rate of 300-400 r / min, add sodium hydroxide solution dropwise, controlling the dropping rate to 1-2 drops / s. After the addition is complete, continue stirring for 8-10 hours. After the reaction is complete, cool the reaction product to room temperature, then filter under vacuum. Pour the filtrate into toluene, wash with distilled water until neutral, and allow to stand for separation. Remove the solvent by rotary evaporation of the organic phase, and then place it in a vacuum drying oven at 60-65℃ for 5-6 hours to obtain the high-performance resin. Step B6: Add the high-performance resin, diluent, curing agent and anhydrous ethanol to a three-necked flask equipped with a stirrer and thermometer. Stir the mixture at 55-60℃ and a stirring rate of 300-400 r / min for 1-1.5 h. After the reaction is complete, cool the reaction product to room temperature to obtain the high-performance adhesive.

2. The reinforced high-strength rubber V-belt according to claim 1, characterized in that, In step A1, the ratio of aramid fiber, lithium chloride, and anhydrous ethanol is 10g:8-10g:100-120mL; in step A2, the ratio of silane coupling agent KH-560, graphene oxide, anhydrous ethanol, and pretreated fiber is 8-10g:1.5-2.5g:100-120mL:10g.

3. The reinforced high-strength rubber V-belt according to claim 1, characterized in that, In step B1, the ratio of phthalic anhydride, 1-naphthol, and methanesulfonic acid is 0.1 mol: 0.2 mol: 120-150 mL, and the mass fraction of the sodium hydroxide solution is 25-30%.

4. The reinforced high-strength rubber V-belt according to claim 1, characterized in that, In step B2, the ratio of sodium hydroxide, deionized water, intermediate 1, and zinc powder is 0.15-0.2 mol: 100-120 mL: 10 mmol: 0.5-0.8 g, and the mass fraction of the hydrochloric acid solution is 15-20%.

5. The reinforced high-strength rubber V-belt according to claim 1, characterized in that, The ratio of tert-butanol, paraformaldehyde, anhydrous potassium carbonate, 2,6-di-tert-butylphenol, and deionized water in step B3 is 45-50 mL: 2.8-3 g: 0.15-0.2 g: 25-30 mmol: 15-20 mL.

6. The reinforced high-strength rubber V-belt according to claim 1, characterized in that, The ratio of intermediate 2, intermediate 3, p-toluenesulfonic acid and dichloromethane in step B4 is 10 mmol: 10 mmol: 0.25-0.4 g: 60-80 mL.

7. The reinforced high-strength rubber V-belt according to claim 1, characterized in that, In step B5, the ratio of intermediate 4, epichlorohydrin, and sodium hydroxide solution is 10 mmol: 80-100 mmol: 25-30 mL, and the mass fraction of the sodium hydroxide solution is 30-35%.

8. The reinforced high-strength rubber V-belt according to claim 1, characterized in that, In step B6, the ratio of the high-performance resin, diluent, curing agent, and anhydrous ethanol is 10g:1.5-4g:4-5g:20-30mL. The diluent is epoxy diluent 669, and the curing agent is T-31 curing agent.

9. A method for preparing a reinforced high-strength rubber V-belt, characterized in that, The preparation of the reinforced high-strength rubber V-belt as described in any one of claims 1-8 includes the following steps: Step 1: Weave the modified fibers into a fiber cloth with a thickness of 0.5-1mm to form a reinforcing layer (2). Step 2: Mix natural rubber and styrene-butadiene rubber evenly at a mass ratio of 20-25:10-15, then extrude into strips and vulcanize to obtain a rubber layer with a thickness of 2-3 mm (1). Step 3: Apply high-performance adhesive evenly to both sides of the reinforcing layer (2), and then stick rubber layer (1) on both sides to form a composite strip from top to bottom consisting of rubber layer (1), reinforcing layer (2), rubber layer (1), reinforcing layer (2), and rubber layer (1). Then roll the composite strip to shape it. Step 4: Cut the rolled composite belt into a V-belt shape and place the V-belt into a vulcanizing tank for vulcanization treatment to obtain the reinforced high-strength rubber V-belt.

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