High-pressure-resistant hydraulic rubber pipe and manufacturing method thereof
Through improved nitrile mixing formula and graft reaction technology, a three-dimensional network structure is formed, which solves the problem of poor wear resistance of existing nitrile rubber materials, and significantly improves the wear resistance and service life of hydraulic hoses.
Patent Information
- Application Number
- CN202510424178.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-05-09
AI Technical Summary
The existing nitrile rubber materials have a large wear volume and a slightly poor wear resistance, making it difficult to meet the needs of use under high pressure and complex working conditions.
The improved nitrile mixing rubber formula is adopted, including nitrile rubber, neoprene, polyurethane rubber, carbon black and modified carbon fiber, and a three-dimensional network structure is formed through grafting reactions of groups such as siliconoxy, ester, phenyl, carboxyl, methylpyrazine, etc., to enhance the binding force between raw materials and the density of network structure.
It significantly improves the tensile strength of nitrile rubber material, reduces the wear volume and compression permanent deformation rate, enhances wear resistance and tear resistance, and extends the service life of hydraulic hoses.
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of hydraulic hoses, and more specifically, to a high-pressure resistant hydraulic hose and a manufacturing method thereof. Background Art
[0002] Hydraulic hose is one of the key components in hydraulic system. It is widely used in many fields such as shipbuilding, metallurgy, oil field, agriculture, petrochemical, mining, etc. Hydraulic hose mainly transports oily liquid or water-based liquid with certain pressure and temperature, and can also transport gas, slurry or granular flowable substances. Hydraulic hose is mainly composed of inner rubber layer, reinforcement layer and outer rubber layer. The inner rubber layer is in direct contact with the conveying medium. The reinforcement layer can increase the overall stiffness and strength and ensure the use pressure. The outer rubber layer plays a protective role and reduces the damage of the hydraulic hose to the external environment. The outer rubber layer is generally made of nitrile rubber compound by vulcanization. After vulcanization, the nitrile rubber compound forms nitrile rubber material, which has excellent heat resistance, oil resistance, weather resistance and chemical corrosion resistance. Nitrile rubber compound is generally based on nitrile rubber and chloroprene rubber. On this basis, zinc oxide, sulfur, accelerator, filler, etc. are added. The raw materials are mixed to obtain nitrile rubber compound, which is further vulcanized to obtain nitrile rubber material. However, the applicant has found in actual research that the nitrile rubber material obtained by using the above formula has a large wear volume and slightly poor wear resistance, which needs to be further improved. Summary of the invention
[0003] In order to reduce the wear volume and improve the wear resistance, the present application provides a high-pressure resistant hydraulic hose and a manufacturing method thereof.
[0004] In the first aspect, the present application provides a high-pressure resistant hydraulic hose, which adopts the following technical solution: A high-pressure resistant hydraulic hose, comprising an inner rubber layer, a reinforcement layer, and an outer rubber layer arranged in sequence from the inside to the outside, wherein the outer rubber layer is formed by vulcanizing a nitrile rubber mixture; The nitrile rubber compound is mainly made of the following raw materials in parts by weight: 60-80 parts of nitrile rubber, 15-25 parts of chloroprene rubber, 5-15 parts of polyurethane rubber, 4-6 parts of compatibilizer, 4-6 parts of zinc oxide, 1-3 parts of stearic acid, 2-4 parts of sulfur, 1-3 parts of accelerator, 35-45 parts of carbon black, 8-12 parts of modified carbon fiber, 3-5 parts of silane coupling agent and 2-4 parts of anti-aging agent; the modified carbon fiber is obtained by treating carbon fiber with 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine.
[0005] The hydraulic hose of the present application includes an inner rubber layer, a reinforcement layer, and an outer rubber layer, and the cooperation between them not only enables the hydraulic hose to maintain excellent mechanical strength and pressure resistance, improve heat resistance, oil resistance, weather resistance and chemical corrosion resistance, but also enhances wear resistance and tear resistance, enhances usage stability, extends service life, and makes the hydraulic hose suitable for long-term stable operation under a variety of complex working conditions.
[0006] The nitrile rubber compound of the present application is vulcanized to obtain a nitrile rubber material, which is used as the outer rubber layer of the hydraulic hose. The nitrile rubber material, through the mutual coordination of the raw materials, has a tensile strength greater than 22 and a wear volume less than 90mm 3 , 120℃, 22h, 25% compression permanent deformation rate is less than 20%, and it has the advantages of high tensile strength, small wear volume, high wear resistance, and low compression permanent deformation rate. And the nitrile rubber material of the present application is based on nitrile rubber, chloroprene rubber, and polyurethane rubber. On this basis, carbon black and modified carbon fiber are added at the same time, and the interaction between them and the matrix is used to form a three-dimensional network structure. Furthermore, 3-allyloxypropyl trimethoxysilane, 3-aminophenylpropionic acid, and 2-aminomethyl-5-methylpyrazine are used to treat the carbon fiber to obtain modified carbon fiber, and a large number of siloxy, ester, phenyl, carboxyl, methylpyrazine and other groups are introduced on the surface of the carbon fiber, which greatly enhances the bonding force between the raw materials, enhances the density of the network structure, reduces structural defects, improves tensile strength, and reduces the wear volume and compression permanent deformation rate, so that it exhibits better comprehensive performance.
[0007] Optionally, the modified carbon fiber is mainly prepared by the following method: T1. Mix water and carbon fiber, add 3-allyloxypropyltrimethoxysilane, stir for 1-3 hours, filter, and obtain silane pretreated carbon fiber; T2. At a temperature of 60-70° C., mix ethanol and silane-modified carbon fiber, add 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine, stir for 4-6 hours, filter, wash, and dry to obtain modified carbon fiber.
[0008] First, the carbon fiber is dispersed in water, and then 3-allyloxypropyl trimethoxysilane is grafted on the surface of the carbon fiber using siloxane, and a carbon-carbon double bond is introduced to obtain silane pretreated carbon fiber. After that, the silane pretreated carbon fiber is dispersed in ethanol, and then 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine are further grafted using the addition reaction of the carbon-carbon double bond and the amino group, and phenyl, carboxyl, methylpyrazine and other groups are introduced to obtain modified carbon fiber, which not only ensures the stability of the preparation of the modified carbon fiber, but also improves the tensile strength of the nitrile rubber material, reduces the wear volume and compression permanent deformation rate, enhances the overall performance of the hydraulic hose, improves the high pressure resistance, and prolongs the service life.
[0009] Optionally, the weight ratio of the carbon fiber, 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid, and 2-aminomethyl-5-methylpyrazine is 20:(2-4):(1-3):(1-3).
[0010] The weight ratio of carbon fiber, 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine is optimized to limit the added amounts of 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine, ensure the stability of the grafting reaction, and ensure the stability of the modified carbon fiber preparation and its use effect.
[0011] Optionally, in the modified carbon fiber preparation method, the weight ratio of 3-allyloxypropyl trimethoxy silicon and water is (2-4): (170-230). In one embodiment, the weight ratio of 3-allyloxypropyl trimethoxy silicon and water is 2:200, in another embodiment, the weight ratio of 3-allyloxypropyl trimethoxy silicon and water is 3:200, in another embodiment, the weight ratio of 3-allyloxypropyl trimethoxy silicon and water is 4:200, and the weight ratio can also be set to 2:170, 2:230, 3:170, 3:230, 4:170, 4:230 as needed, but it is not limited to the listed values, and other values not listed within the numerical range are also applicable.
[0012] Optionally, in the modified carbon fiber preparation method, the weight ratio of 3-aminophenylpropionic acid and ethanol is (1-3): (170-230). In one embodiment, the weight ratio of 3-aminophenylpropionic acid and ethanol is 1:200, in another embodiment, the weight ratio of 3-aminophenylpropionic acid and ethanol is 2:200, in another embodiment, the weight ratio of 3-aminophenylpropionic acid and ethanol is 3:200, and the weight ratio can also be set to 1:170, 1:230, 2:170, 2:230, 3:170, 3:230 as needed, but it is not limited to the listed values, and other values not listed within the numerical range are also applicable.
[0013] Optionally, the average length of the carbon fiber used in the modified carbon fiber is 0.1-5mm, and the average diameter is 1-20μm. In multiple embodiments, the average length of the carbon fiber is 1.2mm, and the average diameter is 6μm. The average length can also be set to 0.1mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm as needed, and the average diameter can also be set to 1μm, 3μm, 5μm, 7μm, 9μm, 10μm, 11μm, 13μm, 15μm, 17μm, 19μm, 20μm as needed, but it is not limited to the listed values, and other unlisted values within the numerical range are also applicable.
[0014] Optionally, the average particle size of the carbon black is 10-200nm. In multiple embodiments, the average particle size of the carbon black is 30nm, and the average particle size can also be set to 10nm, 20nm, 40nm, 50nm, 60nm, 70nm, 80nm, 90nm, 100nm, 150nm, 200nm as required, but is not limited to the listed values, and other unlisted values within the numerical range are also applicable.
[0015] Optionally, the compatibilizer is one or more of maleic anhydride grafted ABS, maleic anhydride grafted styrene, chlorinated polyethylene, and ethylene-acrylate-glycidyl methacrylate terpolymer; The silane coupling agent is one or more of coupling agent KH550, coupling agent KH560, coupling agent KH570, coupling agent KH580, and coupling agent KH590.
[0016] The compatibilizer and silane coupling agent are optimized to facilitate the selection of compatibilizer and silane coupling agent. Moreover, the compatibilizer can effectively improve the compatibility between nitrile rubber, chloroprene rubber and polyurethane rubber, and the silane coupling agent can enhance the compatibility between carbon black, modified carbon fiber and matrix, and improve the overall uniformity and stability.
[0017] Optionally, the accelerator is one or more of accelerator MBTS, accelerator NOBS, accelerator TMTD, accelerator TBZTD, and accelerator NS; The antioxidant is one or more of antioxidant 4020, antioxidant 4010NA, antioxidant MB, antioxidant TNP, antioxidant RD, and antioxidant SP.
[0018] The accelerator and anti-aging agent are optimized to facilitate their selection. The accelerator can accelerate the vulcanization reaction, improve the efficiency and uniformity of vulcanization, and enhance the mechanical strength of the hydraulic hose. The anti-aging agent can reduce the aging phenomenon during long-term use and extend the service life of the hydraulic hose.
[0019] Optionally, the accelerators are three types of accelerators: MBTS, NOBS, and TMTD, and the weight ratio of MBTS, NOBS, and TMTD is (1-3):(1-3):(1-3). In multiple embodiments, the weight ratio of MBTS, NOBS, and TMTD is 2:1:1, and the weight ratio can also be set to 1:1:1, 1:1:3, 1:3:1, 1:3:3, 3:1:1, 3:1:3, 3:3:1 as needed, but it is not limited to the listed values, and other values not listed within the numerical range are also applicable.
[0020] Optionally, the inner rubber layer is formed by vulcanizing nitrile rubber compound.
[0021] The inner rubber layer is made of nitrile rubber compound by vulcanization. The raw materials of the inner rubber layer and the outer rubber layer are the same, which is convenient for the preparation of the inner rubber layer and the outer rubber layer. It can also significantly improve the chemical corrosion resistance and anti-penetration ability of the hydraulic hose and extend its service life.
[0022] Optionally, the reinforcement layer is a glass fiber tape winding layer, a steel wire winding layer, and a steel wire braided layer arranged in sequence from the inside to the outside.
[0023] The glass fiber tape winding layer, the steel wire winding layer and the steel wire braided layer form a reinforcement layer, and utilize the interaction between them to not only increase the overall strength of the hydraulic hose, reduce the expansion and deformation of the hydraulic hose caused by the internal pressure, but also enhance the hydraulic hose's compression and tensile properties, so that the hydraulic hose maintains good rigidity and stability and extends its service life.
[0024] Optionally, the nitrile rubber compound is mainly prepared by the following method: The nitrile rubber, chloroprene rubber, polyurethane rubber, compatibilizer, anti-aging agent, zinc oxide, stearic acid, carbon black, modified carbon fiber, silane coupling agent, sulfur and accelerator are mixed, taken out and allowed to stand to obtain the nitrile rubber mixture.
[0025] In a second aspect, the present application provides a method for manufacturing a high-pressure resistant hydraulic hose, which adopts the following technical solution: A method for manufacturing a high-pressure resistant hydraulic hose mainly comprises the following steps: S1, mixing the raw materials of the inner rubber layer to obtain an inner layer mixed rubber, and mixing the raw materials of the outer rubber layer to obtain an outer layer mixed rubber; S2, extruding an inner layer of mixed rubber on the outer peripheral surface of the mold core, and the inner layer of mixed rubber forms an inner mixed rubber layer; S3, providing a reinforcing layer on the outer peripheral surface of the inner mixed rubber layer; S4, extruding an outer layer of mixed rubber on the outer peripheral surface of the reinforcement layer, and the outer layer of mixed rubber forms an outer mixed rubber layer; S5. A vulcanization protective layer is provided on the outer peripheral surface of the outer mixed rubber layer, and then vulcanization is performed to form an inner rubber layer from the inner mixed rubber layer and an outer rubber layer from the outer mixed rubber layer. The vulcanization protective layer and the mold core are removed to obtain a hydraulic hose.
[0026] Optionally, in step S5, the vulcanization temperature is 140-170°C, the pressure is 5-10MPa, and the time is 50-150min. In multiple embodiments, the vulcanization temperature is 155°C, the pressure is 8MPa, and the time is 100min. The vulcanization temperature can be set to 140°C, 145°C, 150°C, 160°C, 165°C, 170°C as needed. The vulcanization pressure can also be set to 5MPa, 6MPa, 7MPa, 9MPa, 10MPa as needed. The vulcanization time can also be set to 50min, 60min, 70min, 80min, 90min, 110min, 120min, 130min, 140min, 150min as needed, but it is not limited to the listed values, and other unlisted values within the numerical range are also applicable.
[0027] In summary, this application has at least the following beneficial effects: 1. The hydraulic hose of the present application utilizes the mutual cooperation of the inner rubber layer, the reinforcement layer and the outer rubber layer to have good mechanical strength, compression resistance, wear resistance and tear resistance, and also maintains excellent heat resistance, oil resistance and weather resistance, thereby enhancing the stability of use, extending the service life, and making the hydraulic hose suitable for long-term stable operation under a variety of complex working conditions.
[0028] 2. The nitrile rubber compound of the present application is vulcanized to obtain the nitrile rubber material, and is used as the outer rubber layer of the hydraulic hose. The raw materials of the nitrile rubber compound are based on nitrile rubber, chloroprene rubber, and polyurethane rubber. On this basis, carbon black and modified carbon fiber are added at the same time. The surface of the modified carbon fiber contains a large number of siloxy, ester, phenyl, carboxyl, methylpyrazine and other groups, and the synergistic effect between them is utilized to enhance the bonding force between the raw materials, enhance the density of the network structure, reduce structural defects, improve the tensile strength, and reduce the wear volume and compression permanent deformation rate, so that the tensile strength is greater than 22 and the wear volume is less than 90mm. 3 , 120℃, 22h, 25% compression permanent deformation rate is less than 20%. It has the advantages of high tensile strength, small wear volume, high wear resistance and low compression permanent deformation rate, showing better comprehensive performance. DETAILED DESCRIPTION
[0029] In order to make the present application easier to understand, the present application will be further described in detail below in conjunction with the examples, which are merely illustrative and are not intended to limit the scope of application of the present application. The raw materials or components used in the present application can be obtained through commercial routes or conventional methods unless otherwise specified.
[0030] Preparation Example Preparation Example 1 A modified carbon fiber is mainly prepared by the following method: T1. Add 20 kg of carbon fiber to 200 kg of water at a rotation speed of 800 r / min and stir for 20 min. Add 3 kg of 3-allyloxypropyl trimethoxysilane and stir for 2 h. Then filter to obtain silane pretreated carbon fiber.
[0031] Among them, the average length of the carbon fiber is 1.2mm, the average diameter is 6μm, and it is selected from Lianyungang Rui Innovation Materials Technology Co., Ltd.
[0032] T2, at a speed of 800r / min and a temperature of 65°C, add the silane-modified carbon fiber obtained in step T1 to 200kg of ethanol and stir for 5min. Add 2kg of 3-aminophenylpropionic acid and 2kg of 2-aminomethyl-5-methylpyrazine and stir for 5h. Then filter, wash twice with ethanol, using 50kg of ethanol each time, wash once with water, using 50kg of water each time, and then dry to obtain modified carbon fiber.
[0033] Preparation Example 2 A modified carbon fiber, which is different from Preparation Example 1 in that the added amounts of 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid, and 2-aminomethyl-5-methylpyrazine are different, and the added amount of 3-allyloxypropyltrimethoxysilane is 2kg, the added amount of 3-aminophenylpropionic acid is 1kg, and the added amount of 2-aminomethyl-5-methylpyrazine is 3kg.
[0034] Preparation Example 3 A modified carbon fiber, which is different from Preparation Example 1 in that the added amounts of 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid, and 2-aminomethyl-5-methylpyrazine are different, and the added amount of 3-allyloxypropyltrimethoxysilane is 4kg, the added amount of 3-aminophenylpropionic acid is 3kg, and the added amount of 2-aminomethyl-5-methylpyrazine is 1kg. Example
[0035] Table 1 Amount of each raw material used in nitrile rubber compound (unit: kg) Example 1
[0036] A high-pressure resistant hydraulic hose, the hydraulic hose comprises an inner rubber layer, a reinforcing layer and an outer rubber layer arranged in sequence from the inside to the outside. The inner rubber layer is made of nitrile rubber compound by vulcanization, and the outer rubber layer is made of nitrile rubber compound by vulcanization. The reinforcing layer is a glass fiber tape winding layer, a steel wire winding layer and a steel wire braiding layer arranged in sequence from the inside to the outside.
[0037] A method for manufacturing a high-pressure resistant hydraulic hose mainly comprises the following steps: S1. Mixing the raw materials of the inner rubber layer to obtain an inner layer rubber mix, and mixing the raw materials of the outer rubber layer to obtain an outer layer rubber mix, wherein the inner layer rubber mix is a nitrile rubber mix, and the outer layer rubber mix is a nitrile rubber mix, and the raw materials and raw material ratios of the nitrile rubber mix are shown in Table 1.
[0038] Among them, the nitrile rubber is nitrile rubber JSR N240S; the chloroprene rubber is chloroprene rubber SN232; the polyurethane rubber is polyurethane BTE-75A; the compatibilizer is ethylene-acrylate-glycidyl methacrylate terpolymer, and the ethylene-acrylate-glycidyl methacrylate terpolymer is Arkema AX8900; the accelerators are accelerator MBTS, accelerator NOBS, and accelerator TMTD, and the weight ratio of accelerator MBTS, accelerator NOBS, and accelerator TMTD is 2:1:1.
[0039] The average particle size of carbon black is 30 nm, and it is selected from Dongguan Canyu Chemical Co., Ltd.; the modified carbon fiber is prepared by the method of Preparation Example 1; the silane coupling agent is coupling agent KH560; and the anti-aging agent is anti-aging agent 4010NA.
[0040] The nitrile rubber compound is mainly prepared by the following method: adding chloroprene rubber, polyurethane rubber, compatibilizer, and anti-aging agent to nitrile rubber, and mixing for 6 minutes. Adding zinc oxide, stearic acid, carbon black, modified carbon fiber, and silane coupling agent, and mixing for 10 minutes. Adding sulfur and accelerator, and mixing for 10 minutes. Taking out, standing at a temperature of 25°C for 20 hours, and obtaining the nitrile rubber compound.
[0041] S2. Extruding an inner layer of mixed rubber on the outer peripheral surface of the mold core, the inner layer of mixed rubber forms an inner mixed rubber layer.
[0042] S3, winding glass fiber tape on the outer peripheral surface of the inner mixed rubber layer to form a glass fiber tape winding layer. Then winding steel wire to form a steel wire winding layer. Then weaving steel wire to form a steel wire braiding layer. The glass fiber tape winding layer, the steel wire winding layer and the steel wire braiding layer form a reinforcement layer.
[0043] S4, extruding an outer layer of mixed rubber on the outer peripheral surface of the reinforcing layer, and the outer layer of mixed rubber forms an outer mixed rubber layer.
[0044] S5. Wrap a water cloth around the outer peripheral surface of the outer mixed rubber layer to form a vulcanized protective layer. Then, vulcanize for 100 minutes at a temperature of 155°C and a pressure of 8MPa, so that the inner mixed rubber layer forms an inner rubber layer and the outer mixed rubber layer forms an outer rubber layer. Remove the vulcanized protective layer and the mold core to obtain a hydraulic hose. Example 2
[0045] A high-pressure resistant hydraulic hose, which differs from Example 1 in that, in step S1, the raw material ratio of the nitrile rubber compound is different, and the raw material ratio of the nitrile rubber compound is shown in Table 1. Example 3
[0046] A high-pressure resistant hydraulic hose, which differs from Example 1 in that, in step S1, the raw material ratio of the nitrile rubber compound is different, and the raw material ratio of the nitrile rubber compound is shown in Table 1. Example 4
[0047] A high-pressure resistant hydraulic hose is different from Example 1 in that, in step S1, the source of the modified carbon fiber in the raw material of the nitrile rubber compound is different, and the modified carbon fiber is prepared by the method of Preparation Example 2. Example 5
[0048] A high-pressure resistant hydraulic hose, which differs from Example 1 in that, in step S1, the source of the modified carbon fiber in the raw material of the nitrile rubber compound is different, and the modified carbon fiber is prepared by the method of Preparation Example 3.
[0049] Comparative Example Comparative Example 1 A high-pressure resistant hydraulic hose, which differs from Example 1 in that, in step S1, an equal amount of carbon black is used to replace the modified carbon fiber in the raw material of the nitrile rubber compound.
[0050] Comparative Example 2 A high-pressure resistant hydraulic hose, which differs from Example 1 in that in step S1, an equal amount of modified carbon fiber is used to replace carbon black in the raw material of the nitrile rubber compound.
[0051] Comparative Example 3 A high-pressure resistant hydraulic hose, which differs from Example 1 in that, in step S1, an equal amount of carbon fiber is used to replace the modified carbon fiber in the raw material of the nitrile rubber compound.
[0052] Comparative Example 4 A high-pressure resistant hydraulic hose, which differs from Example 1 in that, in step S1, in the raw material of the nitrile rubber compound, in the modified carbon fiber preparation method, an equal amount of 3-allyloxypropyltrimethoxysilane is used to replace 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine.
[0053] Comparative Example 5 A high-pressure resistant hydraulic hose, which differs from Example 1 in that, in step S1, in the raw material of the nitrile rubber compound, in the modified carbon fiber preparation method, an equal amount of 3-aminophenylpropionic acid is used to replace 2-aminomethyl-5-methylpyrazine.
[0054] Comparative Example 6 A high-pressure resistant hydraulic hose, which differs from Example 1 in that, in step S1, in the raw material of the nitrile rubber compound, in the modified carbon fiber preparation method, an equal amount of 2-aminomethyl-5-methylpyrazine is used to replace 3-aminophenylpropionic acid.
[0055] Performance Testing (1) The nitrile rubber mixtures obtained in step S1 of Examples 1-5 and Comparative Examples 1-6 were respectively vulcanized for 100 min at a temperature of 155° C. and a pressure of 8 MPa to obtain nitrile rubber materials. The following performance tests were performed on the nitrile rubber materials. The test results are shown in Table 2.
[0056] Among them, the tensile strength of nitrile rubber material was tested according to GB / T528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber".
[0057] According to GB / T9867-2008 “Determination of wear resistance of vulcanized rubber or thermoplastic rubber (rotating drum abrader method)”, the wear volume of nitrile rubber material is tested.
[0058] According to GB / T7759-2015 "Determination of compression set of vulcanized rubber or thermoplastic rubber Part 1: At room temperature and high temperature conditions", the compression set rate of nitrile rubber materials is tested.
[0059] Table 2 Test results
[0060] As can be seen from Table 2, the nitrile rubber compound of the present application, which is vulcanized to obtain the nitrile rubber material and used as the inner rubber layer and outer rubber layer of the hydraulic hose, has a high tensile strength of 22.54-23.46MPa, showing the advantage of high tensile strength, and also has a low wear volume and compression permanent deformation rate, with a wear volume of 73-88mm 3 , 120℃, 22h, 25% compression permanent deformation rate is 18.63-19.54%, showing the advantages of small wear volume, high wear resistance and low compression permanent deformation rate. The nitrile rubber material of the present application has the characteristics of high tensile strength, good wear resistance and low compression permanent deformation rate through the mutual coordination between the raw materials, has good comprehensive performance, and can be suitable for the application of hydraulic hoses.
[0061] Comparative Examples 1-2 and Example 1 are compared. Carbon black is added to the raw materials of the nitrile rubber mix of Comparative Example 1; modified carbon fiber is added to the raw materials of the nitrile rubber mix of Comparative Example 2; and carbon black and modified carbon fiber are added to the raw materials of the nitrile rubber mix of Example 1. It can be seen that by adding carbon black and modified carbon fiber to the raw materials at the same time, and utilizing the synergistic effect between the two, the nitrile rubber material forms a three-dimensional network structure, enhances the bonding force and the interaction between the raw materials, improves the tensile strength, and reduces the wear volume and compression permanent deformation rate.
[0062] Comparative Example 3 and Example 1 are compared. Carbon fiber is added to the raw material of the nitrile rubber compound in Comparative Example 3; modified carbon fiber is added to the raw material of the nitrile rubber compound in Example 1. It can be seen that, compared with adding carbon fiber to the raw material, modifying the carbon fiber with organic matter and adding the modified carbon fiber to the raw material can significantly increase the use effect of the carbon fiber and make the nitrile rubber material show better comprehensive performance.
[0063] Comparative Examples 4-6 and Example 1 are compared. The modified carbon fiber of Comparative Example 4 is obtained by treating the carbon fiber with 3-allyloxypropyltrimethoxysilane; the modified carbon fiber of Comparative Example 5 is obtained by treating the carbon fiber with 3-allyloxypropyltrimethoxysilane and 3-aminophenylpropionic acid; the modified carbon fiber of Comparative Example 6 is obtained by treating the carbon fiber with 3-allyloxypropyltrimethoxysilane and 2-aminomethyl-5-methylpyrazine; the modified carbon fiber of Example 1 is obtained by treating the carbon fiber with 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine. It can be seen from this that in the preparation method of modified carbon fiber, 3-allyloxypropyltrimethoxysilane is first grafted on the surface of the carbon fiber, and then 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine are grafted at the same time, and phenyl, carboxyl and methylpyrazine are introduced. This can increase the compatibility and interfacial bonding properties between the modified carbon fiber and the raw materials, improve the binding force, enhance the density of the network structure, reduce structural defects, significantly improve the tensile strength, and reduce the wear volume and compression permanent deformation rate.
[0064] It should be noted that the embodiments described above are only used to explain the present application and do not constitute any limitation to the present application. The present application is described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present application may be modified as specified within the scope of the claims of the present application, and the present application may be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and embodiments, it does not mean that the present application is limited to the specific examples disclosed therein. On the contrary, the present application can be extended to all other methods and applications with the same functions.
Claims
1. A high pressure resistant hydraulic hose, characterized by: The hydraulic hose comprises an inner rubber layer, a reinforcement layer and an outer rubber layer arranged in sequence from the inside to the outside, wherein the outer rubber layer is formed by vulcanizing a nitrile rubber compound; The nitrile rubber compound is mainly made of the following raw materials in parts by weight: 60-80 parts of nitrile rubber, 15-25 parts of chloroprene rubber, 5-15 parts of polyurethane rubber, 4-6 parts of compatibilizer, 4-6 parts of zinc oxide, 1-3 parts of stearic acid, 2-4 parts of sulfur, 1-3 parts of accelerator, 35-45 parts of carbon black, 8-12 parts of modified carbon fiber, 3-5 parts of silane coupling agent and 2-4 parts of anti-aging agent; the modified carbon fiber is obtained by treating carbon fiber with 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine.
2. A high pressure resistant hydraulic hose according to claim 1, characterized in that: The modified carbon fiber is mainly prepared by the following method: T1. Mix water and carbon fiber, add 3-allyloxypropyltrimethoxysilane, stir for 1-3 hours, filter, and obtain silane pretreated carbon fiber; T2. At a temperature of 60-70° C., mix ethanol and silane-modified carbon fiber, add 3-aminophenylpropionic acid and 2-aminomethyl-5-methylpyrazine, stir for 4-6 hours, filter, wash, and dry to obtain modified carbon fiber.
3. A high pressure resistant hydraulic hose according to claim 2, characterized in that: The weight ratio of the carbon fiber, 3-allyloxypropyltrimethoxysilane, 3-aminophenylpropionic acid, and 2-aminomethyl-5-methylpyrazine is 20:(2-4):(1-3):(1-3).
4. A high pressure resistant hydraulic hose according to claim 1, characterized in that: The carbon fibers used in the modified carbon fibers have an average length of 1-5 mm and an average diameter of 50-300 μm.
5. The high-pressure resistant hydraulic hose according to claim 1, characterized in that: The average particle size of the carbon black is 100-500 μm.
6. A high pressure resistant hydraulic hose according to claim 1, characterized in that: The compatibilizer is one or more of maleic anhydride grafted ABS, maleic anhydride grafted styrene, chlorinated polyethylene, and ethylene-acrylate-glycidyl methacrylate terpolymer; The silane coupling agent is one or more of coupling agent KH550, coupling agent KH560, coupling agent KH570, coupling agent KH580, and coupling agent KH590.
7. The high pressure resistant hydraulic hose according to claim 1, characterized in that: The accelerator is one or more of accelerator MBTS, accelerator NOBS, accelerator TMTD, accelerator TBZTD, and accelerator NS; The antioxidant is one or more of antioxidant 4020, antioxidant 4010NA, antioxidant MB, antioxidant TNP, antioxidant RD, and antioxidant SP.
8. The high pressure resistant hydraulic hose according to claim 1, characterized in that: The inner rubber layer is formed by vulcanizing a nitrile rubber mixture.
9. The high-pressure resistant hydraulic hose according to claim 1, characterized in that: The reinforcement layer is a glass fiber tape winding layer, a steel wire winding layer, and a steel wire braided layer which are arranged in sequence from the inside to the outside.
10. A method for manufacturing a high-pressure resistant hydraulic hose according to any one of claims 1 to 9, characterized in that: The main steps are as follows: S1, mixing the raw materials of the inner rubber layer to obtain an inner layer mixed rubber, and mixing the raw materials of the outer rubber layer to obtain an outer layer mixed rubber; S2, extruding an inner layer of mixed rubber on the outer peripheral surface of the mold core, and the inner layer of mixed rubber forms an inner mixed rubber layer; S3, providing a reinforcing layer on the outer peripheral surface of the inner mixed rubber layer; S4, extruding an outer layer of mixed rubber on the outer peripheral surface of the reinforcement layer, and the outer layer of mixed rubber forms an outer mixed rubber layer; S5. A vulcanization protective layer is provided on the outer peripheral surface of the outer mixed rubber layer, and then vulcanization is performed to form an inner rubber layer from the inner mixed rubber layer and an outer rubber layer from the outer mixed rubber layer. The vulcanization protective layer and the mold core are removed to obtain a hydraulic hose.