High-wear-resistance rubber pipe for washing machine

Abstract

The invention relates to the technical field of rubber tubes, and provides a high-wear-resistance rubber tube for a washing machine. The high-wear-resistance rubber tube for the washing machine is prepared from the following raw materials in parts by weight: 50 to 60 parts of nitrile rubber, 20 to 30 parts of ethylene propylene diene monomer, 35 to 45 parts of modified kaolin / boron nitride composite filler, 6 to 10 parts of white carbon black, 3 to 5 parts of nano silicon nitride, 5 to 8 parts of epoxidized soybean oil, 2 to 3 parts of vulcanizing agent, 1.5 to 2 parts of accelerant, 1 to 2 parts of anti-aging agent, 2 to 3 parts of zinc stearate and 2 to 4 parts of nano aluminum oxide. According to the high-wear-resistance rubber pipe for the washing machine, the wear resistance of the rubber pipe is improved, and aging and deformation of the rubber pipe in the using process can be effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber hoses, and more specifically, to a highly wear-resistant rubber hose for washing machines. Background Art

[0002] As a common electrical appliance in modern families, the performance and service life of a washing machine largely depend on the quality and durability of its various components. Among them, the drain pipe, as an important part of the washing machine, its wear resistance, corrosion resistance and sealing performance have an important impact on the overall performance of the washing machine. Traditional washing machine drain pipes are mostly rubber hoses, and these hoses face many challenges during production and use, especially in terms of wear resistance. Therefore, it is of great significance to develop a rubber hose for washing machines with high wear resistance.

[0003] A wear-resistant rubber hose refers to a rubber product with excellent wear resistance, which is widely used in various harsh industrial and commercial environments, such as the petroleum, chemical, mining, construction and other fields. Common wear-resistant rubber hose materials include polyurethane rubber, nitrile rubber, neoprene rubber, etc. Polyurethane rubber hose is a high-performance wear-resistant rubber hose material, with excellent wear resistance, oil resistance and crack resistance. It can withstand high-intensity wear and tear and is suitable for various harsh industrial and commercial environments. In addition, polyurethane rubber hose also has good weather resistance and anti-aging ability, and can maintain good performance within a wide temperature range. Nitrile rubber hose is a commonly used wear-resistant rubber hose material, with good oil resistance and wear resistance. It can be used in harsh environments such as petroleum, chemical, mining, etc., and shows good high-temperature resistance. However, nitrile rubber hose has poor stability to chemical substances such as oxidants, acids and alkalis, which to a certain extent limits its application range. Neoprene rubber hose is a high-quality wear-resistant rubber hose material, with good oil resistance, wear resistance and corrosion resistance. It is also suitable for harsh environments such as petroleum, chemical, mining, etc., and has good high-temperature and low-temperature performance. However, the price of neoprene rubber hose is relatively high, and it is not suitable for some applications with high economic requirements.

[0004] Although existing wear-resistant rubber hoses exhibit certain advantages in terms of wear resistance, oil resistance, and corrosion resistance, there are still many problems in the specific application scenario of washing machine drain hoses. Materials such as polyurethane rubber, nitrile rubber, and neoprene perform well in terms of wear resistance. However, during the long-term use of washing machine drain hoses, due to factors such as water flow scouring, detergent corrosion, and frequent bending, the wear resistance of these materials is still insufficient. Over time, it is easy to cause problems such as drain hose breakage and leakage, affecting the normal use of the washing machine. As an important part of the drainage system, the sealing performance of the washing machine drain hose is crucial. However, existing wear-resistant rubber hoses still have deficiencies in terms of sealing performance. On the one hand, due to defects in the material itself or problems in the production process, the seal between the rubber hose and the washing machine drain outlet may not be tight; on the other hand, during use, due to factors such as rubber hose aging and deformation, the sealing performance may also decline. These problems may all lead to issues such as poor drainage and water leakage in the washing machine. Based on this, the present invention proposes a highly wear-resistant rubber hose for washing machines. Summary of the Invention

[0005] The present invention proposes a highly wear-resistant rubber hose for washing machines, aiming to improve the wear resistance of the rubber hose and effectively prevent aging and deformation of the rubber hose during use.

[0006] The technical solution of the present invention is as follows: The present invention proposes a highly wear-resistant rubber hose for washing machines, which is composed of the following raw materials in parts by weight: 50 - 60 parts of nitrile rubber, 20 - 30 parts of ethylene propylene diene monomer rubber, 35 - 45 parts of modified kaolin / boron nitride composite filler, 6 - 10 parts of white carbon black, 3 - 5 parts of nano silicon nitride, 5 - 8 parts of epoxy soybean oil, 2 - 3 parts of vulcanizing agent, 1.5 - 2 parts of accelerator, 1 - 2 parts of antioxidant, 2 - 3 parts of zinc stearate, and 2 - 4 parts of nano alumina.

[0007] As a further technical solution, the preparation method of the modified kaolin / boron nitride composite filler includes: first, impregnating kaolin and boron nitride in a silane coupling agent solution for stirring reaction, washing, and drying to obtain a pretreated composite filler; adding the pretreated composite filler to acetone for ultrasonic dispersion, then adding 1-butyl-3-methylimidazolium hexafluorophosphate thereto, stirring for 8 - 12 h, evaporating to remove acetone, and drying to obtain a surface-dually modified kaolin / boron nitride composite filler.

[0008] As a further technical solution, the particle size of the kaolin is 5 - 10 μm, and the particle size of the boron nitride is 50 - 60 nm; the weight ratio of kaolin to boron nitride is (3 - 4):1.

[0009] As a further technical solution, the method for preparing the silane coupling agent solution includes: diluting the silane coupling agent KH550 in a mixed solvent of absolute ethanol and deionized water with a volume ratio of (9 - 11):1 to obtain a silane coupling agent solution with a mass fraction of 3% - 5%.

[0010] As a further technical solution, the stirring speed of the stirring reaction is 100 - 140 rpm, the stirring temperature is 60 - 70 °C, and the reaction time is 2 - 3 h.

[0011] As a further technical solution, the evaporation method is to perform reduced-pressure evaporation at 40 - 50 °C using a rotary evaporator.

[0012] As a further technical solution, the weight ratio of the pretreated composite filler, acetone, and 1-butyl-3-methylimidazolium hexafluorophosphate is 10:70 - 80:0.1 - 0.5.

[0013] As a further technical solution, the vulcanizing agent is dicumyl peroxide, the accelerator is accelerator CBS or accelerator TMTD, and the antioxidant includes antioxidant RD and antioxidant 4010A with a weight ratio of 1 - 2:1.

[0014] The present invention also provides a method for preparing a highly wear-resistant rubber tube for a washing machine, and the steps include: kneading nitrile rubber and ethylene propylene diene monomer rubber at 60 - 70 °C for 15 - 20 min in an open mill to form a uniform rubber compound, sequentially adding modified kaolin / boron nitride composite filler, silica, nano-boron nitride, zinc stearate, nano-aluminum oxide, and epoxidized soybean oil, continuing to knead for 8 - 12 min, then adding a vulcanizing agent, an accelerator, and an antioxidant and continuing to knead for 6 - 8 min to obtain a kneaded rubber compound, shaping the kneaded rubber compound into a tube through an extruder, and obtaining the product after vulcanization.

[0015] As a further technical solution, the vulcanization temperature is 140 - 146 °C, the pressure is 15 - 20 MPa, and the vulcanization time is 20 - 30 min.

[0016] The working principle and beneficial effects of the present invention are as follows: The present invention combines micron-sized kaolin and nano-sized boron nitride particles to form an efficient size complementary and dense reinforcement network. Kaolin serves as a physical support, providing the stability and strength foundation for the rubber matrix, while boron nitride fills the microvoids, enhancing the tightness of the connections inside the rubber. This network structure effectively improves the mechanical properties of the rubber, especially outstanding in terms of wear resistance. In practical applications, as a rubber tube for a washing machine, this structure can effectively resist the impact and friction of water flow, significantly extending the service life.

[0017] The present invention utilizes dual modification to enhance interfacial bonding and dispersibility. Through the dual modification of pretreatment with silane coupling agent and coating with ionic liquid, the interfacial bonding force between the filler and the rubber matrix and the dispersibility of the filler are effectively improved. The chemical bonding formed by the silane coupling agent strengthens the connection between the filler and the rubber matrix, avoids the shedding or sliding of the filler, and ensures the stability of the overall performance of the rubber. The coating with ionic liquid optimizes the dispersion state of the filler, enabling it to be more evenly distributed in the rubber matrix, thereby more effectively exerting the reinforcing effect and enhancing the overall performance of the rubber.

[0018] The present invention introduces an appropriate amount of ethylene propylene diene monomer (EPDM) rubber to form a synergistic effect with nitrile butadiene rubber, effectively balancing the rigidity and flexibility of the rubber. The addition of EPDM rubber reduces the rigidity of nitrile butadiene rubber, improves its tensile strength and wear resistance, and simultaneously improves the processing performance of the rubber. In addition, EPDM rubber also has good aging resistance, which can delay the aging process of the rubber and further extend the service life of the rubber hose.

[0019] The synergistic effect of nano silicon nitride and nano aluminum oxide provides the rubber hose with excellent wear resistance and anti-aging performance. The high hardness characteristic of nano silicon nitride enhances the wear resistance of the rubber and reduces surface wear; while nano aluminum oxide improves the heat resistance of the rubber, enabling it to maintain stable performance in high-temperature environments. The synergistic effect of the two enables the rubber hose to maintain good performance in different usage environments and extends its service life.

[0020] The present invention finely regulates the dosage of the vulcanizing agent to ensure that the crosslinking density of the rubber is within the optimal range, thereby enhancing the tensile strength and wear resistance of the rubber. At the same time, the application of epoxidized soybean oil as an environmentally friendly plasticizer not only increases the flexibility and plasticity of the rubber but also acts as a stabilizer to prevent the aging of the rubber. Compared with traditional plasticizers, epoxidized soybean oil has better stability, avoids the occurrence of migration phenomenon, and further enhances the aging resistance of the rubber. In addition, the environmental protection characteristics of epoxidized soybean oil also meet the requirements of modern society for green materials. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0022] Example 1 In this embodiment, a highly wear-resistant rubber tube for a washing machine is provided, which is composed of the following raw materials in parts by weight: 55 parts of nitrile rubber, 25 parts of ethylene propylene diene monomer rubber, 40 parts of modified kaolin / boron nitride composite filler, 8 parts of silica, 4 parts of nano silicon nitride, 6 parts of epoxidized soybean oil, 2.5 parts of vulcanizing agent, 1.7 parts of accelerator, 1.5 parts of antioxidant, 2.5 parts of zinc stearate, and 3 parts of nano alumina.

[0023] Among them, the preparation method of the modified kaolin / boron nitride composite filler includes: diluting the silane coupling agent KH550 in a mixed solvent of anhydrous ethanol and deionized water with a volume ratio of 10:1 to obtain a silane coupling agent solution with a mass fraction of 4%; first, impregnating kaolin and boron nitride in the silane coupling agent solution and carrying out a stirring reaction for 2.5 h, with a stirring speed of 120 rpm and a stirring temperature of 65 °C, washing the product 3 times with anhydrous ethanol, and drying it in a vacuum drying oven at 90 °C for 22 hours to obtain the pretreated composite filler; the particle size of kaolin is 7 μm, and the particle size of boron nitride is 55 nm; and the weight ratio of kaolin to boron nitride is 3.5:1; Adding the pretreated composite filler to acetone and ultrasonic dispersing for 50 min, then adding 1-butyl-3-methylimidazolium hexafluorophosphate, and stirring at room temperature for 10 h to uniformly coat the ionic liquid on the surface of the pretreated composite filler, using a rotary evaporator to evaporate acetone under reduced pressure at 45 °C, and drying at 70 °C for 22 hours to obtain the surface double-modified modified kaolin / boron nitride composite filler; the weight ratio of the pretreated composite filler, acetone, and 1-butyl-3-methylimidazolium hexafluorophosphate is 10:75:0.3.

[0024] Among them, the vulcanizing agent is dicumyl peroxide, the accelerator is accelerator CBS or accelerator TMTD, and the antioxidant includes antioxidant RD and antioxidant 4010A with a weight ratio of 1.5:1.

[0025] The preparation steps of this highly wear-resistant rubber tube for a washing machine include: mixing nitrile rubber and ethylene propylene diene monomer rubber in an open mill at 65 °C for 17 min to form a uniform rubber compound, successively adding the modified kaolin / boron nitride composite filler, silica, nano silicon nitride, zinc stearate, nano alumina, and epoxidized soybean oil, continuing to mix for 10 min, then adding the vulcanizing agent, accelerator, and antioxidant and continuing to mix for 78 min to obtain a mixed rubber compound, forming the mixed rubber compound into a tube shape through an extruder, and vulcanizing at a temperature of 143 °C, a pressure of 17 MPa for 25 min to obtain it.

[0026] Example 2 In this embodiment, a highly wear-resistant rubber tube for a washing machine is provided, which is composed of the following raw materials in parts by weight: 50 parts of nitrile rubber, 20 parts of ethylene propylene diene monomer rubber, 35 parts of modified kaolin / boron nitride composite filler, 6 parts of white carbon black, 3 parts of nano silicon nitride, 5 parts of epoxy soybean oil, 2 parts of vulcanizing agent, 1.5 parts of accelerator, 1 part of antioxidant, 2 parts of zinc stearate, and 2 parts of nano alumina.

[0027] Among them, the preparation method of the modified kaolin / boron nitride composite filler includes: diluting the silane coupling agent KH550 in a mixed solvent of anhydrous ethanol and deionized water with a volume ratio of 9:1 to obtain a silane coupling agent solution with a mass fraction of 3%; first, impregnating kaolin and boron nitride in the silane coupling agent solution and stirring for reaction for 2 h, with a stirring speed of 100 rpm and a stirring temperature of 60 °C, washing the product 3 times with anhydrous ethanol, and drying in a vacuum drying oven at 80 °C for 20 hours to obtain the pretreated composite filler; the particle size of kaolin is 5 μm, and the particle size of boron nitride is 50 nm; and the weight ratio of kaolin to boron nitride is 4:1; Adding the pretreated composite filler to acetone and ultrasonically dispersing for 40 min, then adding 1-butyl-3-methylimidazolium hexafluorophosphate, and stirring at room temperature for 8 h to uniformly coat the ionic liquid on the surface of the pretreated composite filler. Using a rotary evaporator to evaporate acetone under reduced pressure at 40 °C, and drying at 60 °C for 20 hours to obtain the surface double-modified modified kaolin / boron nitride composite filler; the weight ratio of the pretreated composite filler, acetone, and 1-butyl-3-methylimidazolium hexafluorophosphate is 10:70:0.1.

[0028] Among them, the vulcanizing agent is dicumyl peroxide, the accelerator is accelerator CBS or accelerator TMTD, and the antioxidant includes antioxidant RD and antioxidant 4010A with a weight ratio of 1:1.

[0029] The preparation steps of this highly wear-resistant rubber tube for a washing machine include: mixing nitrile rubber and ethylene propylene diene monomer rubber in an open mill at 60 °C for 15 min to form a uniform rubber compound, sequentially adding the modified kaolin / boron nitride composite filler, white carbon black, nano silicon nitride, zinc stearate, nano alumina, and epoxy soybean oil, continuing to mix for 8 min, then adding the vulcanizing agent, accelerator, and antioxidant and continuing to mix for 6 min to obtain a mixed rubber compound. Shaping the mixed rubber compound into a tube through an extruder, and vulcanizing at a temperature of 140 °C, a pressure of 15 MPa, for 20 min to obtain it.

[0030] Example 3 In this embodiment, a highly wear-resistant rubber tube for a washing machine is provided, which is composed of the following raw materials in parts by weight: 60 parts of nitrile rubber, 30 parts of ethylene propylene diene monomer rubber, 45 parts of modified kaolin / boron nitride composite filler, 10 parts of white carbon black, 5 parts of nano silicon nitride, 8 parts of epoxy soybean oil, 3 parts of vulcanizing agent, 2 parts of accelerator, 2 parts of antioxidant, 3 parts of zinc stearate, and 4 parts of nano alumina.

[0031] Among them, the preparation method of the modified kaolin / boron nitride composite filler includes: diluting the silane coupling agent KH550 in a mixed solvent of anhydrous ethanol and deionized water with a volume ratio of 11:1 to obtain a silane coupling agent solution with a mass fraction of 5%; first, impregnating kaolin and boron nitride in the silane coupling agent solution and carrying out a stirring reaction for 3 h, with a stirring speed of 140 rpm and a stirring temperature of 70 °C, washing the product 3 times with anhydrous ethanol, and drying it in a vacuum drying oven at 100 °C for 24 hours to obtain the pretreated composite filler; the particle size of kaolin is 10 μm, and the particle size of boron nitride is 60 nm; and the weight ratio of kaolin to boron nitride is 4:1; Adding the pretreated composite filler to acetone and ultrasonic dispersing it for 60 min, then adding 1-butyl-3-methylimidazolium hexafluorophosphate, and stirring at room temperature for 12 h to uniformly coat the ionic liquid on the surface of the pretreated composite filler. Using a rotary evaporator, acetone is removed under reduced pressure at 50 °C, and after drying at 80 °C for 24 hours, a surface double-modified modified kaolin / boron nitride composite filler is obtained; the weight ratio of the pretreated composite filler, acetone, and 1-butyl-3-methylimidazolium hexafluorophosphate is 10:80:0.5.

[0032] Among them, the vulcanizing agent is dicumyl peroxide, the accelerator is accelerator CBS or accelerator TMTD, and the antioxidant includes antioxidant RD and antioxidant 4010A with a weight ratio of 2:1.

[0033] The preparation steps of this highly wear-resistant rubber tube for a washing machine include: mixing nitrile rubber and ethylene propylene diene monomer rubber in an open mill at 70 °C for 20 min to form a uniform rubber compound, successively adding the modified kaolin / boron nitride composite filler, white carbon black, nano silicon nitride, zinc stearate, nano alumina, and epoxy soybean oil, continuing to mix for 12 min, then adding the vulcanizing agent, accelerator, and antioxidant and continuing to mix for 8 min to obtain a mixed rubber compound. The mixed rubber compound is formed into a tube by an extruder and vulcanized at a temperature of 146 °C, a pressure of 20 MPa, for 30 min to obtain the product.

[0034] Example 4 In this embodiment, a highly wear-resistant rubber tube for a washing machine is provided, which is composed of the following raw materials in parts by weight: 50 parts of nitrile rubber, 30 parts of ethylene propylene diene monomer rubber, 35 parts of modified kaolin / boron nitride composite filler, 10 parts of silica, 3 parts of nano silicon nitride, 8 parts of epoxidized soybean oil, 2 parts of vulcanizing agent, 2 parts of accelerator, 1 part of antioxidant, 3 parts of zinc stearate, and 2 parts of nano alumina.

[0035] Among them, the preparation method of the modified kaolin / boron nitride composite filler includes: diluting the silane coupling agent KH550 in a mixed solvent of absolute ethanol and deionized water with a volume ratio of 11:1 to obtain a silane coupling agent solution with a mass fraction of 3%; first, impregnating kaolin and boron nitride in the silane coupling agent solution and stirring for 3 h, with a stirring speed of 100 rpm and a stirring temperature of 70 °C, washing the product 3 times with absolute ethanol, and drying in a vacuum drying oven at 80 °C for 24 hours to obtain the pretreated composite filler; the particle size of kaolin is 5 μm, and the particle size of boron nitride is 60 nm; and the weight ratio of kaolin to boron nitride is 3:1. Adding the pretreated composite filler to acetone and ultrasonically dispersing for 40 min, then adding 1-butyl-3-methylimidazolium hexafluorophosphate, and stirring at room temperature for 12 h to uniformly coat the surface of the pretreated composite filler with the ionic liquid. Using a rotary evaporator to remove acetone under reduced pressure at 40 °C, and drying at 80 °C for 20 hours to obtain the surface double-modified modified kaolin / boron nitride composite filler; the weight ratio of the pretreated composite filler, acetone, and 1-butyl-3-methylimidazolium hexafluorophosphate is 10:80:0.1.

[0036] Among them, the vulcanizing agent is dicumyl peroxide, the accelerator is accelerator CBS or accelerator TMTD, and the antioxidant includes antioxidant RD and antioxidant 4010A with a weight ratio of 1:1.

[0037] The preparation steps of this highly wear-resistant rubber tube for a washing machine include: mixing nitrile rubber and ethylene propylene diene monomer rubber in an open mill at 60 °C for 20 min to form a uniform rubber compound, successively adding the modified kaolin / boron nitride composite filler, silica, nano silicon nitride, zinc stearate, nano alumina, and epoxidized soybean oil, continuing to mix for 8 min, then adding the vulcanizing agent, accelerator, and antioxidant and continuing to mix for 8 min to obtain a mixed rubber compound. Shaping the mixed rubber compound into a tube through an extruder, and vulcanizing at a temperature of 140 °C, a pressure of 20 MPa for 20 min to obtain it.

[0038] Comparative Example 1 Based on Example 1 with adjustments, different from Example 1, kaolin was not added as a raw material in Comparative Example 1.

[0039] Comparative Example 2 Based on Example 1 with adjustments, different from Example 1, boron nitride was not added as a raw material in Comparative Example 2.

[0040] Comparative Example 3 Based on Example 1 with adjustments, different from Example 1, in Comparative Example 3, 1-butyl-3-methylimidazolium hexafluorophosphate was not added for ionic liquid coating of the modified filler.

[0041] Comparative Example 4 Based on Example 1 with adjustments, different from Example 1, in the preparation of the modified kaolin / boron nitride composite filler in Comparative Example 4, the silane coupling agent solution was not added.

[0042] Comparative Example 5 Based on Example 1 with adjustments, different from Example 1, in Comparative Example 5, the modified kaolin / boron nitride composite filler was not used, and an equal amount of unmodified kaolin was used instead.

[0043] Comparative Example 6 Based on Example 1 with adjustments, different from Example 1, in Comparative Example 6, the amount of ethylene propylene diene monomer rubber was reduced to 5 parts, and the amount of nitrile rubber was increased to 75 parts.

[0044] Comparative Example 7 Based on Example 1 with adjustments, different from Example 1, Comparative Example 7 does not contain nano silicon nitride.

[0045] Comparative Example 8 Based on Example 1 with adjustments, different from Example 1, in Comparative Example 8, the amount of vulcanizing agent (DCP) was reduced to 1 part.

[0046] Comparative Example 9 Based on Example 1 with adjustments, different from Example 1, in Comparative Example 9, ordinary plasticizer DOP was used to replace epoxy soybean oil.

[0047] Test Example 1: The rubber hoses prepared in the aforementioned Examples 1 - 4 and Comparative Examples 1 - 9 were tested as follows: 1. Abrasion resistance: The relative volume wear amount was tested with reference to the standard of GB / T 9867 - 2008. 2. Tensile strength: The test was carried out with reference to the standard of GB / T528 - 2009, using a universal material testing machine with a tensile speed of 500 mm / min. 3. Heat aging resistance: The test was carried out with reference to the standard of GB / T3512 - 2014, with aging conditions of 120 °C × 100 h, and the retention rate was calculated after testing the tensile strength. 4. Acid resistance: The specimen was immersed in a sulfuric acid aqueous solution with a mass fraction of 20% for 100 h, and the retention rate was calculated after testing the tensile strength. 5. Alkaline resistance: Immerse the specimen in an aqueous sodium hydroxide solution with a mass fraction of 20% for 100 h, and calculate the retention rate after testing the tensile strength.

[0048] The test results are shown in Table 1 below: Table 1

[0049] Combining the above data, it can be seen that the wear resistance and tensile strength of Comparative Example 1 and Comparative Example 2 are significantly lower than those of Example 1, indicating that through size complementarity, micron-sized kaolin and nano-sized boron nitride form a dense reinforcement network, improving mechanical properties and wear resistance. The performance of Comparative Example 3 and Comparative Example 4 is inferior to that of Example 1, proving that the silane coupling agent improves the filler-matrix interface bonding, and the ionic liquid further optimizes the dispersibility, and both dual modifications are indispensable. The tensile strength of Comparative Example 6 is lower than that of Example 1, indicating that the introduction of ethylene-propylene-diene monomer rubber can balance the oil resistance and elasticity of nitrile rubber and prevent performance degradation caused by excessive rigidity. The abrasion loss of Comparative Example 7 is inferior to that of Example 1, indicating that the hardness of nano-sized silicon nitride and the heat resistance of alumina jointly improve the wear resistance and anti-aging performance. The tensile strength of Comparative Example 8 is significantly reduced, proving that the dosage of dicumyl peroxide needs to be ≥2.5 parts to ensure sufficient crosslinking. The aging resistance retention rate of Comparative Example 9 is lower than that of Example 1. Epoxidized soybean oil has both plasticizing and stabilizing functions, avoiding performance deterioration caused by the migration of traditional plasticizers. The strength retention rate after acid-base treatment of Example 1 is much higher than that of the comparative examples, indicating that the modified composite filler blocks the penetration of corrosive media through interface densification, and the ionic liquid coating may impart certain hydrophobicity.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high wear-resistant rubber hose for a washing machine, characterized in that: The invention is composed of the following raw materials in parts by weight: 50-60 parts of nitrile rubber, 20-30 parts of EPDM rubber, 35-45 parts of modified kaolin / boron nitride composite filler, 6-10 parts of white carbon black, 3-5 parts of nano silicon nitride, 5-8 parts of epoxy soybean oil, 2-3 parts of vulcanizing agent, 1.5-2 parts of accelerator, 1-2 parts of antioxidant, 2-3 parts of zinc stearate and 2-4 parts of nano alumina.

2. A high wear-resistant rubber hose for a washing machine according to claim 1, characterized in that: The preparation method of the modified kaolin / boron nitride composite filler comprises: firstly immersing kaolin and boron nitride in a silane coupling agent solution for stirring reaction, washing and drying to obtain a pretreated composite filler; adding the pretreated composite filler into acetone for ultrasonic dispersion, then adding 1-butyl-3-methylimidazole hexafluorophosphate thereto, stirring for 8-12 hours, evaporating to remove acetone, and drying to obtain a surface-double-modified modified kaolin / boron nitride composite filler.

3. A high wear-resistant rubber hose for a washing machine according to claim 2, characterized in that: The particle size of the kaolin is 5-10 μm, and the particle size of the boron nitride is 50-60 nm; the weight ratio of the kaolin to the boron nitride is 3-4:

1.

4. A high wear-resistant rubber hose for a washing machine according to claim 2, characterized in that: The preparation method of the silane coupling agent solution comprises: diluting the silane coupling agent KH550 in a mixed solvent of anhydrous ethanol and deionized water in a volume ratio of 9-11:1 to obtain a silane coupling agent solution with a mass fraction of 3%-5%.

5. A high wear-resistant rubber hose for a washing machine according to claim 2, characterized in that: The stirring reaction has a stirring speed of 100-140 rpm, a stirring temperature of 60-70° C., and a reaction time of 2-3 h.

6. A high wear-resistant rubber hose for a washing machine according to claim 2, characterized in that: The evaporation method is to use a rotary evaporator to evaporate under reduced pressure at 40-50°C.

7. A high wear-resistant rubber hose for a washing machine according to claim 2, characterized in that: The weight ratio of the pretreated composite filler, acetone and 1-butyl-3-methylimidazole hexafluorophosphate is 10:70-80:0.1-0.

5.

8. The high wear-resistant rubber hose for a washing machine according to claim 1, characterized in that: The vulcanizing agent is dicumyl peroxide, the accelerator is accelerator CBS or accelerator TMTD, and the antioxidant includes antioxidant RD and antioxidant 4010A in a weight ratio of 1-2:

1.

9. The method for preparing a high wear-resistant rubber hose for a washing machine according to any one of claims 1 to 8, characterized in that the steps include: The nitrile rubber and EPDM rubber are mixed in an open mill at 60-70° C. for 15-20 minutes to form a uniform rubber material, and modified kaolin / boron nitride composite filler, white carbon black, nano silicon nitride, zinc stearate, nano alumina and epoxy soybean oil are added in sequence, and the mixing is continued for 8-12 minutes. Subsequently, a vulcanizer, an accelerator and an antioxidant are added and the mixing is continued for 6-8 minutes to obtain a rubber compound, and the rubber compound is formed into a tube through an extruder and vulcanized to obtain the obtained rubber compound.

10. The method for preparing a high wear-resistant rubber hose for a washing machine according to claim 9, characterized in that: The vulcanization temperature is 140-146° C., the pressure is 15-20 MPa, and the vulcanization time is 20-30 min.

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