A high-temperature-resistant steel wire reinforced hydraulic rubber hose inner rubber and a preparation method thereof

Abstract

This invention belongs to the technical field of EPDM rubber materials, specifically relating to a high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber and its preparation method. The preparation method of the high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber of this invention includes the following steps: S1, firstly, EPDM rubber is epoxidized using hydrogen peroxide solution to obtain epoxidized EPDM rubber, and then the epoxidized EPDM rubber is modified using 4-(trimethoxysilyl)aniline to obtain modified EPDM rubber; S2, the modified EPDM rubber and silicone resin are added to a mixer for the first stage of mixing, then filler, mica powder, plasticizer, zinc oxide, sulfur, accelerator, and antioxidant are added for the second stage of mixing, followed by discharge of the rubber to obtain the high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber. This invention, through the synergistic effect of its components, ensures both good heat resistance and significantly improves wear resistance.

Description

Technical Field

[0001] This invention belongs to the technical field of EPDM rubber materials, specifically relating to a high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber and its preparation method. Background Technology

[0002] Hydraulic transmission is a process of applying pressure to a liquid medium to transmit energy and achieve control. Hydraulic cylinders, as the actuators of hydraulic transmission systems, are widely used in various equipment such as engineering machinery, medical equipment, and aerospace due to their high power density and reliability. Sealing devices play a crucial role in the normal operation of hydraulic cylinders. Based on their motion, they can be divided into static seals and dynamic seals; based on their working principle, they can be divided into non-contact seals and contact seals. Seals are key components affecting the normal operation and transmission efficiency of sealing devices, and are closely related to the control accuracy and adjustment performance of the hydraulic system. Rubber sealing rings, as commonly used sealing components in contact seals, have a direct impact on the stability, safety, and stamping quality of the hydraulic system.

[0003] Steel wire reinforced hydraulic rubber hose is a flexible connector used in hydraulic systems to transport high-pressure fluids. Its core consists of an inner rubber layer and a steel wire reinforcement layer. It has the characteristics of high pressure resistance, pulse resistance, and bending resistance. It is widely used in various industrial and engineering machinery fields. It has the following characteristics: (1) Flexibility and ease of installation. The hose body is soft and has excellent bending performance, which makes it easy to lay the hose in narrow spaces; (2) Outstanding oil resistance, corrosion resistance, and aging resistance. It has a long service life and can transport common hydraulic media such as mineral oil, emulsion, and water glycol; (3) Good pulse resistance. It can resist frequent pressure fluctuations and impacts in hydraulic systems and has a longer fatigue life under high pressure and high pulse conditions.

[0004] Chinese Patent (Publication No. CN121182017A) discloses a rubber material for cold- and high-temperature resistant hydraulic hoses and its preparation method. The rubber material for cold- and high-temperature resistant hydraulic hoses comprises, by weight, 65-75 parts of nitrile rubber, 5-15 parts of butadiene rubber, 5-10 parts of silicone rubber, 5-10 parts of ethylene propylene rubber, 5-10 parts of hydrogenated nitrile rubber, 10-15 parts of precipitated silica VN3, 110-130 parts of carbon black N762, 5-8 parts of plasticizer DOS, 5-8 parts of plasticizer TP-90B, 3-5 parts of zinc oxide, 0.5-1.0 parts of stearic acid, 1-2 parts of antioxidant KY-405, 1-2 parts of antioxidant RD, 0.5-1.0 parts of microcrystalline wax Antilux 654, 3-5 parts of homogeneous resin 40MSF, 1.5-2.5 parts of sulfur, and accelerator CZ. 1.0-1.5 parts, peroxide F40P-SP2 1.5-2.5 parts, crosslinking agent SK8911D70 0.5-1.0 parts, Ricobond 1731HS 5-7 parts. However, this patented technology lacks research on the wear resistance of rubber materials, and there is also room for further improvement in heat resistance.

[0005] Therefore, how to use specific EPDM rubber as the main raw material, combined with other functional components, to prepare rubber materials with good wear resistance and heat resistance, so that they can be well applied to the inner rubber of steel wire reinforced hydraulic rubber hoses and still function normally in extreme environments such as high temperature, has become a direction that needs to be studied. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber and its preparation method. The invention first prepares modified EPDM rubber using ethylene-norbornene-containing EPDM rubber as raw material. Then, the modified EPDM rubber and silicone resin are added to a mixer for the first stage of mixing. Next, fillers, mica powder, plasticizers, zinc oxide, sulfur, accelerators, and antioxidants are added for the second stage of mixing. After discharging the rubber, the high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber is obtained. Through the synergistic effect of the components, both good heat resistance and significantly improved wear resistance are ensured.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: In a first aspect, this invention provides a method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose, comprising the following steps: S1. First, epoxidize EPDM rubber with hydrogen peroxide solution to obtain epoxidized EPDM rubber, and then modify the epoxidized EPDM rubber with 4-(trimethoxysilyl)aniline to obtain modified EPDM rubber. S2. The modified EPDM rubber and silicone resin are added to a mixer for the first stage of mixing. Then, filler, mica powder, plasticizer, zinc oxide, sulfur, accelerator and antioxidant are added for the second stage of mixing. The rubber is discharged to obtain the inner rubber of the high-temperature resistant steel wire reinforced hydraulic rubber hose.

[0008] As a preferred technical solution of the present invention, the conditions for the first stage of mixing in step S2 are: temperature of 80~90℃ and time of 80~100s.

[0009] As a preferred technical solution of the present invention, the conditions for the second stage of mixing in step S2 are: temperature of 90~100℃ and time of 160~180s.

[0010] As a preferred technical solution of the present invention, the glue discharge temperature in step S2 is 105~110℃.

[0011] As a preferred technical solution of the present invention, the components in step S2 include, by weight, 50-60 parts of modified EPDM rubber, 40-50 parts of filler material, 10-20 parts of silicone resin, 8-10 parts of mica powder, 4-6 parts of plasticizer, 3-5 parts of zinc oxide, 1-2 parts of sulfur, 1-2 parts of accelerator, and 1-2 parts of antioxidant.

[0012] As a preferred technical solution of the present invention, the modified EPDM rubber can be in the following weight parts: 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, or 60 parts, etc.

[0013] As a preferred embodiment of the present invention, the weight parts of the filler material may be 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, or 50 parts, etc.

[0014] As a preferred embodiment of the present invention, the weight parts of the organosilicon resin may be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, or 20 parts, etc.

[0015] As a preferred technical solution of the present invention, the mica powder may be in the following weight proportions: 8 parts, 9 parts, or 10 parts, etc.

[0016] As a preferred embodiment of the present invention, the plasticizer may be present in 4, 5, or 6 parts by weight, etc.

[0017] As a preferred embodiment of the present invention, the zinc oxide may be in the form of 3, 4, or 5 parts by weight.

[0018] As a preferred embodiment of the present invention, the sulfur may be expressed in parts by weight of 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, or 2 parts, etc.

[0019] As a preferred embodiment of the present invention, the weight parts of the accelerator may be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, or 2 parts, etc.

[0020] As a preferred embodiment of the present invention, the amount of the antioxidant by weight can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, or 2 parts, etc.

[0021] As a preferred technical solution of the present invention, the preparation steps of the epoxidized EPDM rubber are as follows: by weight, 20-30 parts of EPDM rubber are added to 400-500 parts of n-hexane and stirred for 50-60 minutes. After heating to 40-50°C, 0.4-0.6 parts of formic acid and 1-2 parts of Tween 80 are added and stirred for 20-30 minutes. Then, 4-6 parts of 30% hydrogen peroxide solution are added for epoxidation treatment for 6-8 hours. Finally, 40-50 parts of sodium carbonate solution with a concentration of 25 mg / mL are added and stirred for 10-20 minutes. After standing and separating into layers, the aqueous phase is removed, washed with deionized water, flocculated with ethanol, and vacuum dried to obtain epoxidized EPDM rubber.

[0022] As a preferred technical solution of the present invention, the modification treatment steps are as follows: by weight, 20-30 parts of epoxidized EPDM rubber and 200-300 parts of xylene are added to a reaction vessel and mixed evenly. The mixture is heated to 130-140°C under an argon atmosphere and stirred for 10-20 minutes. After cooling to room temperature, 8-12 parts of 4-(trimethoxysilyl)aniline are added and stirred for 50-60 minutes. The mixture is then stirred and modified at 60-70°C for 2-4 hours. The mixture is then distilled under reduced pressure and dried under vacuum to obtain modified EPDM rubber.

[0023] This invention uses hexane as a solvent, formic acid as a catalyst, and Tween 80 as an emulsifier. It uses hydrogen peroxide solution to epoxidize EPDM rubber, and then uses 4-(trimethoxysilyl)aniline for modification. The amino group of 4-(trimethoxysilyl)aniline and the epoxy group of the epoxidized EPDM rubber undergo a ring-opening reaction, finally obtaining modified EPDM rubber containing benzene rings and organosilicon.

[0024] As a preferred embodiment of the present invention, the filler material is selected from one or more of carbon black, silica, calcium carbonate, talc, kaolin, and bentonite.

[0025] The filling material of this invention can fully fill the gaps between rubber molecular chains, improve the density and integrity of the structure, and at the same time, when subjected to dynamic pressure or bending, the filling material can play a buffering role between the skeleton layers, effectively reducing the frictional fatigue and heat generation of the tube skeleton material under dynamic conditions, thereby ensuring the overall structural stability of the material.

[0026] As a preferred embodiment of the present invention, the filler material is carbon black and bentonite. As a preferred embodiment of the present invention, the mass ratio of carbon black to bentonite in the filler material is (3~4):1.

[0027] As a preferred embodiment of the present invention, the external surface area of ​​the carbon black is ≥110×10⁻⁶. 3 m 2 / kg, loss on heating ≤1.5%, ash content ≤1.0%, residue on 500μm sieve ≤10mg / kg, residue on 45μm sieve ≤500mg / kg.

[0028] As a preferred embodiment of the present invention, the bentonite is lithium-based bentonite with a moisture content ≤12%, a pH of 9~11, and a bulk density of 0.5~1.0 g / cm³. 3 .

[0029] The filler material of this invention is preferably a compound of carbon black and bentonite, wherein the external surface area of ​​the carbon black is controlled to be ≥110×10⁻⁶. 3 m 2 / kg, with a heating loss of ≤1.5%, the high specific surface area increases the contact interface between carbon black and rubber molecular chains, forming stronger physical adsorption and chemical bonding, thereby significantly improving the rubber's resistance to mechanical wear. The small heating loss ensures the material's high-temperature resistance. The bentonite selected is lithium-based bentonite, a special bentonite obtained through lithium-ion exchange modification, which has excellent high-temperature stability and wear resistance. Through the synergistic effect of the two, the overall performance of the inner rubber of the rubber hose is significantly improved.

[0030] As a preferred embodiment of the present invention, the organosilicon resin is a phenyl organosilicon resin, and the phenyl organosilicon resin has a thermal weight loss of ≤5% at 400℃.

[0031] The main chain of the phenyl organosilicon resin of this invention has a Si-O-Si inorganic structure, while the side chains are connected to organic groups such as phenyl groups. Due to the introduction of phenyl siloxane chains, the phenyl organosilicon resin has the dual characteristics of both organic resin and inorganic material, and its comprehensive performance is significantly better than that of ordinary organosilicon resin, which can greatly improve the performance of the inner rubber of rubber hoses.

[0032] As a preferred embodiment of the present invention, the plasticizer is epoxidized soybean oil or stearic acid.

[0033] As a preferred embodiment of the present invention, the accelerator is selected from one or more of accelerators BZ, CZ, and DZ.

[0034] As a preferred embodiment of the present invention, the antioxidant is antioxidant RD or antioxidant 4010NA.

[0035] A second aspect of the present invention provides a high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber prepared by the preparation method described in the first aspect.

[0036] Compared with the prior art, the present invention has the following beneficial effects: (1) The modified EPDM rubber of the present invention contains benzene ring structure and organosilicon molecular chain segments. The benzene ring structure can increase the steric hindrance of the molecular chain, inhibit rubber creep at high temperature, and further enhance wear resistance and high temperature dimensional stability. At the same time, the high bond energy of Si-O bond in organosilicon gives the material excellent heat resistance, and the low surface energy of organosilicon chain segments can reduce the friction coefficient of the rubber compound and thus directly improve wear resistance. (2) The organosilicon resin of the present invention preferably uses phenyl organosilicon resin. Phenyl organosilicon resin inhibits the thermal degradation of polymer chains by means of the steric hindrance effect and electronic conjugation effect of benzene ring, effectively improving the high temperature resistance of the material; in addition, phenyl silicone resin can be uniformly dispersed in rubber and act as a nano hard filler to improve wear resistance. (3) The modified EPDM rubber of the present invention contains benzene rings, which form stable intermolecular π-π conjugation forces with phenyl silicone resin, thereby strengthening the interfacial bonding between the resin phase and the rubber phase. At the same time, the polarity and surface energy of the silicone segments of the two are similar, and the two can form an interpenetrating polymer network to obtain a continuous and dense composite system, thereby significantly improving the heat resistance and wear resistance of the inner rubber of the hose. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram illustrating the preparation of epoxidized EPDM rubber in Example 1 of the present invention.

[0039] Figure 2 This is a schematic diagram illustrating the preparation of modified EPDM rubber in Example 1 of the present invention.

[0040] Figure 3 The images show the FTIR spectra of EPDM rubber, epoxidized EPDM rubber, and modified EPDM rubber in Example 1 of this invention. Detailed Implementation

[0041] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0042] The sources of some components in the examples and comparative examples are as follows: EPDM rubber, model Vistalon 2502, 4.5% ethylidene-norbornene content, purchased from ExxonMobil; Tween 80, CAS No. 9005-65-6, purchased from Shanghai Maclean Biochemical Technology Co., Ltd. Hydrogen peroxide solution, catalog number H112515, mass concentration fraction 30%, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. 4-(trimethoxysilyl)aniline, CAS No. 33976-43-1, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd. Carbon black, model NC1301, with an external surface area of ​​120×10³m² / kg, a loss on heating of 1%, an ash content of 0.7%, a residue of 8 mg / kg on a 500μm sieve, and a residue of 450 mg / kg on a 45μm sieve, was purchased from Nester Carbon Black Co., Ltd. Lithium-based bentonite, model YH-lithium-based, with 11% moisture, pH value of 10, and bulk density of 0.6 g / cm3, was purchased from Zhejiang Yuhong New Materials Co., Ltd. Sodium-based bentonite, product number B991755, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd. Phenyl silicone resin, grade JG-1201, with a thermal weight loss of 4% at 400℃, was purchased from Jiangxi Sibo Chemical Co., Ltd. MQ silicone resin, grade JG-1101, was purchased from Jiangxi Sibo Chemical Co., Ltd. Mica powder, product number D302552, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. Epoxidized soybean oil, CAS No. 8013-07-8, purchased from Shanghai Maclean Biochemical Technology Co., Ltd. Stearic acid, CAS No. 57-11-4, was purchased from Shanghai Maclean Biochemical Technology Co., Ltd. Accelerator BZ, CAS No. 136-23-2, was purchased from Hebi Hengli Rubber & Plastics Co., Ltd. Accelerator CZ, CAS No. 95-33-0, was purchased from Hebi Hengli Rubber & Plastics Co., Ltd. Accelerator DZ, CAS No. 4979-32-2, was purchased from Hebi Hengli Rubber & Plastics Co., Ltd. Antioxidant RD, CAS No. 26780-96-1, was purchased from Hebi Hengli Rubber & Plastics Co., Ltd. Antioxidant 4010NA, CAS No. 101-72-4, was purchased from Hebi Hengli Rubber & Plastics Co., Ltd.

[0043] Example 1: This example provides a method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose, including the following steps: S1. By weight, 30 parts of EPDM rubber were added to 500 parts of n-hexane and stirred for 60 min. After heating to 50℃, 0.6 parts of formic acid and 2 parts of Tween 80 were added and stirred for 20 min. Then, 6 parts of 30% hydrogen peroxide solution were added for epoxidation treatment for 8 h. Finally, 50 parts of sodium carbonate solution with a concentration of 25 mg / mL were added and stirred for 20 min. After standing and separating into layers, the aqueous phase was removed, washed with deionized water, flocculated with ethanol, and dried under vacuum to obtain epoxidized EPDM rubber. 30 parts of epoxidized EPDM rubber and 300 parts of xylene were added to a reaction vessel and mixed evenly. The mixture was heated to 140℃ and stirred for 10 min under an argon atmosphere. After cooling to room temperature, 12 parts of 4-(trimethoxysilyl)aniline were added and stirred for 60 min. Then, the mixture was stirred and modified at 70℃ for 2 h. After vacuum distillation, the mixture was dried under vacuum to obtain modified EPDM rubber.

[0044] S2. By weight, 60 parts of modified EPDM rubber and 20 parts of MQ silicone resin are added to a mixer and mixed for 80 seconds at 90°C. Then, 50 parts of filler (40 parts of carbon black and 10 parts of lithium-based bentonite), 10 parts of mica powder, 6 parts of plasticizer stearic acid, 5 parts of zinc oxide, 2 parts of sulfur, 2 parts of accelerator BZ and 2 parts of antioxidant RD are added and mixed for 160 seconds at 100°C. The rubber is then discharged at 110°C to obtain the inner rubber of the high-temperature resistant steel wire reinforced hydraulic rubber hose.

[0045] Example 2: This example provides a method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose, including the following steps: S1. By weight, 20 parts of EPDM rubber were added to 400 parts of n-hexane and stirred for 50 min. After heating to 40℃, 0.4 parts of formic acid and 1 part of Tween 80 were added and stirred for 30 min. Then, 4 parts of 30% hydrogen peroxide solution were added for epoxidation treatment for 6 h. Finally, 40 parts of sodium carbonate solution with a concentration of 25 mg / mL were added and stirred for 10 min. After standing and separating into layers, the aqueous phase was removed, washed with deionized water, flocculated with ethanol, and dried under vacuum to obtain epoxidized EPDM rubber. 20 parts of epoxidized EPDM rubber and 200 parts of xylene were added to a reaction vessel and mixed evenly. The mixture was heated to 130℃ and stirred for 20 min under an argon atmosphere. After cooling to room temperature, 8 parts of 4-(trimethoxysilyl)aniline were added and stirred for 50 min. Then, the mixture was stirred and modified at 60℃ for 4 h. After vacuum distillation, the mixture was dried under vacuum to obtain modified EPDM rubber.

[0046] S2. By weight, 50 parts of modified EPDM rubber and 10 parts of MQ silicone resin are added to a mixer and mixed for 100 seconds at 80°C. Then, 40 parts of filler (30 parts of carbon black and 10 parts of lithium-based bentonite), 8 parts of mica powder, 4 parts of plasticizer stearic acid, 3 parts of zinc oxide, 1 part of sulfur, 1 part of accelerator CZ and 1 part of antioxidant 4010NA are added and mixed for 180 seconds at 90°C. The rubber is then discharged at 105°C to obtain the inner rubber of the high-temperature resistant steel wire reinforced hydraulic rubber hose.

[0047] Example 3: This example provides a method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose, including the following steps: S1. By weight, 25 parts of EPDM rubber were added to 450 parts of n-hexane and stirred for 54 min. After heating to 45℃, 0.5 parts of formic acid and 1.6 parts of Tween 80 were added and stirred for 28 min. Then, 5 parts of 30% hydrogen peroxide solution were added for epoxidation treatment for 7 h. Finally, 44 parts of sodium carbonate solution with a concentration of 25 mg / mL were added and stirred for 17 min. After standing and separating into layers, the aqueous phase was removed, washed with deionized water, flocculated with ethanol, and dried under vacuum to obtain epoxidized EPDM rubber. 26 parts of epoxidized EPDM rubber and 280 parts of xylene were added to a reaction vessel and mixed evenly. The mixture was heated to 135℃ and stirred for 16 min under an argon atmosphere. After cooling to room temperature, 9 parts of 4-(trimethoxysilyl)aniline were added and stirred for 55 min. Then, the mixture was stirred and modified at 65℃ for 3 h. After vacuum distillation, the mixture was dried under vacuum to obtain modified EPDM rubber.

[0048] S2. By weight, 54 parts of modified EPDM rubber and 16 parts of MQ silicone resin were added to a mixer and mixed for 90 seconds at 85°C. Then, 45 parts of filler (35 parts of carbon black and 10 parts of lithium-based bentonite), 9 parts of mica powder, 5 parts of plasticizer epoxidized soybean oil, 4 parts of zinc oxide, 1.4 parts of sulfur, 1.6 parts of accelerator DZ and 1.5 parts of antioxidant RD were added and mixed for 170 seconds at 96°C. The rubber was discharged at 108°C to obtain the inner rubber of the high-temperature resistant steel wire reinforced hydraulic rubber hose.

[0049] Example 4: The difference between this example and Example 1 is that phenyl silicone resin is used instead of MQ silicone resin.

[0050] Comparative Example 1 The difference between this comparative example and Example 1 is that EPDM rubber (model Vistalon 2502) is used instead of modified EPDM rubber.

[0051] Comparative Example 2 The difference between this comparative example and Example 1 is that the filler material was changed to 50 parts of carbon black.

[0052] Comparative Example 3 The difference between this comparative example and Example 1 is that the filler material was changed to 50 parts of lithium-based bentonite.

[0053] Comparative Example 4 The difference between this comparative example and Example 1 is that the filler material was changed to 40 parts carbon black and 10 parts sodium bentonite.

[0054] The performance of the above embodiments and comparative examples was tested using the following methods: (1) Heat resistance test: The test was conducted in accordance with the requirements of GB / T 3512-2014 Accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber in hot air. The change rate of tensile strength and the change rate of elongation at break after accelerated aging in hot air at 180℃ for 72h were used to evaluate the heat resistance.

[0055] (2) Abrasion resistance test: The test shall be conducted in accordance with the requirements of GB / T 1689-2014 Determination of abrasion resistance of vulcanized rubber (using Akron abrasion tester).

[0056] The performance test data above are shown in Table 1.

[0057] Table 1 Performance Test Results

[0058] As can be seen from the above, the present invention first prepares modified EPDM rubber using EPDM rubber containing ethylene-norbornene as raw material, then adds the modified EPDM rubber and silicone resin to a mixer for the first stage of mixing, and then adds carbon black and bentonite compound filler, mica powder, plasticizer, zinc oxide, sulfur, accelerator and antioxidant for the second stage of mixing, and discharges the rubber to obtain the inner rubber of high temperature resistant steel wire reinforced hydraulic rubber hose. Good heat resistance and wear resistance are achieved through the combined action of multiple components.

[0059] Compared with Example 1, the use of phenyl silicone resin instead of MQ silicone resin resulted in better performance due to the introduction of phenyl silicone resin, thus improving heat resistance and reducing wear volume (Example 4).

[0060] Compared with Example 1, the use of EPDM rubber (model Vistalon 2502) instead of modified EPDM rubber resulted in a lack of the effects of benzene rings and organosilicon in modified EPDM rubber, leading to poorer heat resistance and increased wear volume (Comparative Example 1).

[0061] Compared with Example 1, the filler material was changed to 50 parts carbon black, and the lithium-based bentonite compound was missing, resulting in poor heat resistance and increased wear volume (Comparative Example 2).

[0062] Compared with Example 1, the filler material was changed to 50 parts of lithium-based bentonite, and the carbon black was missing from the compound, resulting in poor heat resistance and increased wear volume (Comparative Example 3).

[0063] Compared with Example 1, the filler material was changed to 40 parts carbon black and 10 parts sodium bentonite. The lack of lithium bentonite resulted in poor heat resistance and increased wear volume (Comparative Example 4).

Claims

1. A method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose, characterized in that, Includes the following steps: S1. First, epoxidize EPDM rubber with hydrogen peroxide solution to obtain epoxidized EPDM rubber, and then modify the epoxidized EPDM rubber with 4-(trimethoxysilyl)aniline to obtain modified EPDM rubber. S2. The modified EPDM rubber and silicone resin are added to a mixer for the first stage of mixing. Then, filler, mica powder, plasticizer, zinc oxide, sulfur, accelerator and antioxidant are added for the second stage of mixing. The rubber is discharged to obtain the inner rubber of the high-temperature resistant steel wire reinforced hydraulic rubber hose.

2. The method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose according to claim 1, characterized in that, The components in step S2, by weight, include: 50-60 parts modified EPDM rubber, 40-50 parts filler, 10-20 parts silicone resin, 8-10 parts mica powder, 4-6 parts plasticizer, 3-5 parts zinc oxide, 1-2 parts sulfur, 1-2 parts accelerator, and 1-2 parts antioxidant.

3. The method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose according to claim 1, characterized in that, The preparation steps of the epoxidized EPDM rubber are as follows: by weight, 20-30 parts of EPDM rubber are added to 400-500 parts of n-hexane and stirred for 50-60 minutes. After heating to 40-50℃, 0.4-0.6 parts of formic acid and 1-2 parts of Tween 80 are added and stirred for 20-30 minutes. Then, 4-6 parts of 30% hydrogen peroxide solution are added for epoxidation treatment for 6-8 hours. Finally, 40-50 parts of sodium carbonate solution with a concentration of 25 mg / mL are added and stirred for 10-20 minutes. After standing and separating into layers, the aqueous phase is removed, washed with deionized water, flocculated with ethanol, and vacuum dried to obtain epoxidized EPDM rubber.

4. The method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose according to claim 1, characterized in that, The modification process is as follows: by weight, 20-30 parts of epoxidized EPDM rubber and 200-300 parts of xylene are added to a reaction vessel and mixed evenly. The mixture is heated to 130-140℃ under an argon atmosphere and stirred for 10-20 minutes. After cooling to room temperature, 8-12 parts of 4-(trimethoxysilyl)aniline are added and stirred for 50-60 minutes. The mixture is then stirred and modified at 60-70℃ for 2-4 hours. The mixture is then distilled under reduced pressure and dried under vacuum to obtain modified EPDM rubber.

5. The method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose according to claim 1, characterized in that, The filler material is selected from one or more of carbon black, silica, calcium carbonate, talc, kaolin, and bentonite.

6. The method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose according to claim 5, characterized in that, The filler material is carbon black and bentonite; The mass ratio of carbon black to bentonite in the filler material is (3~4):

1.

7. The method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose according to claim 5, characterized in that, The external surface area of ​​the carbon black is ≥110×10 3 m 2 / kg, loss on heating ≤1.5%, ash content ≤1.0%, residue on 500μm sieve ≤10mg / kg, residue on 45μm sieve ≤500mg / kg.

8. The method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose according to claim 5, characterized in that, The bentonite is lithium-based bentonite, with a moisture content ≤12%, a pH of 9~11, and a bulk density of 0.5~1.0 g / cm³. 3 .

9. The method for preparing the inner rubber of a high-temperature resistant steel wire reinforced hydraulic rubber hose according to claim 1, characterized in that, The organosilicon resin is a phenyl organosilicon resin, and the phenyl organosilicon resin has a thermal weight loss of ≤5% at 400℃.

10. A high-temperature resistant steel wire reinforced hydraulic rubber hose inner rubber, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 9.

Images