High-strength compression-resistant steel wire reinforced rubber hose and preparation method thereof

Abstract

The invention discloses a high-strength compression-resistant steel wire reinforced rubber hose and a preparation method thereof, and relates to the technical field of rubber hoses. The hose is integrally formed by co-vulcanization of an inner rubber layer, a high-strength steel wire woven reinforcing layer and an outer rubber protective layer, the inner rubber layer takes nitrile rubber as a main body, the outer rubber protective layer adopts ethylene propylene diene monomer rubber with specific Mooney viscosity, and a steel wire layer is formed by double-layer weaving of galvanized steel wires with the diameter of 0.3 mm. In the preparation process, the carbon black N330 and the nano calcium carbonate are modified to improve the performance, rubber materials of the inner rubber layer and the outer rubber layer are prepared step by step through banburying and open milling, then extrusion molding, steel wire compounding and outer rubber coating are conducted, and then vulcanization is conducted to obtain a finished product. According to the hose, through the design of the multi-layer structure and the modified filler, the high-strength and pressure-resistant performance is improved.

Description

Technical Field

[0001] This invention relates to the field of rubber hose technology, specifically to a high-strength, pressure-resistant steel wire reinforced rubber hose and its preparation method. Background Technology

[0002] Steel wire reinforced rubber hoses are core fluid transmission components in hydraulic transmission, chemical conveying, and engineering machinery. Their compressive strength, rubber layer mechanical properties, and interlayer bonding stability directly determine their performance and lifespan. In existing technologies, the inner and outer rubber layers of such hoses often use unmodified carbon black N330 and nano-calcium carbonate as fillers. These unmodified fillers have strong surface inertness and poor compatibility with the rubber matrix, easily leading to agglomeration in the rubber compound. This not only results in uneven filler dispersion but also significantly reduces the reinforcing effect of the rubber matrix, causing insufficient tensile strength, abrasion resistance, and tear resistance of the rubber layer. Long-term use can easily lead to problems such as rubber layer cracking and wear.

[0003] Meanwhile, the bonding between the steel wire reinforcement layer and the adhesive layer in existing hoses mostly relies on a single adhesive, without combining filler modification to improve the adhesive layer's own adhesion. Furthermore, the lack of modified fillers results in weak overall adhesive layer performance, leading to low interlayer bonding strength. Under high-pressure conditions or frequent bending scenarios, the adhesive layer is highly susceptible to delamination and interlayer separation, severely reducing the hose's pressure resistance and structural stability. In addition, the simple treatment methods of existing fillers cannot simultaneously address the oil resistance, weather resistance, and mechanical properties of the rubber layer, limiting the hose's applicability under high-pressure and complex conditions and making it difficult to meet the needs of high-end industrial applications.

[0004] To address the aforementioned issues, the industry urgently needs to improve the bonding strength and dispersibility between the filler and the rubber matrix through efficient modification of the filler, thereby fundamentally improving the overall performance of the adhesive layer. At the same time, this will synergistically enhance the adhesion between the adhesive layer and the steel wire layer, ultimately producing steel wire reinforced rubber hoses with strong compressive strength, firm interlayer bonding, and excellent overall performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-strength, pressure-resistant steel wire reinforced rubber hose and its preparation method, solving the problems of poor mechanical properties of the rubber layer, low interlayer bonding strength, and limited pressure resistance.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-strength, pressure-resistant steel wire reinforced rubber hose is integrally co-vulcanized from an inner rubber layer, a high-strength steel wire braided reinforcement layer, and an outer rubber protective layer. The inner rubber layer is mainly composed of nitrile rubber, which is bonded to the high-strength steel wire braided reinforcement layer using Chemlock CH205 and CH220. The outer rubber protective layer is mainly composed of ethylene propylene diene monomer (EPDM) rubber, which fills the braided gaps of the high-strength steel wire braided reinforcement layer and forms a mechanically interlocking structure with the surface of the inner rubber layer.

[0008] Furthermore, the inner rubber layer comprises the following raw materials in parts by weight: 100 parts nitrile rubber, 40-50 parts modified carbon black N330, 10-15 parts modified nano calcium carbonate, 5-10 parts dioctyl phthalate, 5-6 parts zinc oxide, 1-2 parts stearic acid, 1.3-1.5 parts antioxidant RD, 1.0-1.2 parts antioxidant 4010NA, 1.5-2.0 parts sulfur, 1.0-1.5 parts accelerator CZ, 0.5-1.0 parts accelerator DM, and 0.5-1.0 parts cobalt borylate;

[0009] The outer protective layer comprises the following raw materials in parts by weight: 100 parts EPDM rubber, 50-60 parts modified carbon black N330, 10-15 parts modified nano calcium carbonate, 20-30 parts kaolin, 15-20 parts paraffin oil, 5-6 parts zinc oxide, 1-2 parts stearic acid, 1.3-1.5 parts antioxidant RD, 1.0-1.5 parts sulfur, 1.0-1.5 parts accelerator M, and 0.5-1.0 parts accelerator BZ;

[0010] The high-strength steel wire braided reinforcement layer is made of high-strength galvanized steel wire with a diameter of 0.3mm, formed by double-layer braiding, with a braiding angle of 52-56 and a braiding density of ≥96%.

[0011] The adhesive system is Chemlock CH205 and Chemlock CH220.

[0012] Furthermore, the acrylonitrile content in the nitrile rubber is 33-36%; the Mooney viscosity of the ethylene propylene diene monomer (EPDM) rubber is 40, and the content of 5-ethylidene-2-norbornene is 4.5-5.0%.

[0013] Furthermore, the modified carbon black N330 is prepared using the following specific steps:

[0014] A1. Take high abrasion-resistant carbon black N330, add concentrated nitric acid and deionized water, and reflux and stir at 80-90℃ for 2 hours. After the reaction is completed, wash repeatedly with deionized water until the pH of the filtrate is neutral, and then dry in a 105℃ forced-air drying oven to constant weight to obtain the first modified carbon black.

[0015] A2. Take all of the first-stage modified carbon black, add silane coupling agent KH-570, disperse in a mixed solvent of ethanol and water in a volume ratio of 9:1, adjust the pH value to 4.0-4.5 with acetic acid, and stir the reaction at 60℃ for 2 hours. After the reaction is completed, wash three times with anhydrous ethanol to remove the physically adsorbed coupling agent, and then dry in a vacuum drying oven at 60℃ to constant weight to obtain modified carbon black N330.

[0016] Furthermore, the ratio of high abrasion-resistant carbon black N330, concentrated nitric acid, and deionized water in A1 is 100g: 10-12g: 50-60g.

[0017] Furthermore, the ratio of silane coupling agent KH-570 to mixed solvent in A2 is 2-3g:500ml.

[0018] Furthermore, the modified nano-calcium carbonate is prepared using the following specific steps:

[0019] B1. Add nano-calcium carbonate to a high-speed mixer, stir at 800-1000 r / min, and heat to 100-110℃; melt stearic acid and slowly spray it into the mixer, maintain the temperature and continue to stir at high speed for 30 min to obtain the first modified nano-calcium carbonate.

[0020] B2. Cool the above system to 90-100℃, keep the stirring speed at 800-1000r / min, dilute the aluminate coupling agent DL-411 with anhydrous ethanol and slowly spray it into the mixer. After reacting for 25min, maintain the temperature and remove the alcohol for 10min to obtain the second modified nano calcium carbonate.

[0021] B3. Heat the above system to 110-120℃, and control the stirring speed at 800-1000r / min. Premix zinc methacrylate and benzoyl peroxide evenly, and slowly spray them into the mixer in two batches. After each spraying, maintain the temperature and continue the reaction for 15-20min. After the reaction is completed, cool to below 40℃ and discharge to obtain modified nano calcium carbonate.

[0022] Furthermore, the ratio of nano-calcium carbonate to stearic acid in B1 is 100g:3-5g.

[0023] Furthermore, the ratio of aluminate coupling agent DL-411 to anhydrous ethanol in B2 is 2-4g:4-6g.

[0024] Furthermore, the ratio of zinc methacrylate to benzoyl peroxide in B3 is 5-8g:0.5-1.0g.

[0025] Furthermore, the specific preparation steps of the inner adhesive layer material are as follows:

[0026] Add 100 parts of nitrile rubber, 40-50 parts of modified carbon black N330, 10-15 parts of modified nano calcium carbonate, 5-10 parts of dioctyl phthalate, 5-6 parts of zinc oxide, 1-2 parts of stearic acid, 1.3-1.5 parts of antioxidant RD, and 1.0-1.2 parts of antioxidant 4010NA to a mixer and mix at 80-90℃ until homogeneous. The discharge temperature should be ≤120℃. After sheeting through a two-roll mill, cool to room temperature and let stand for 12-24 hours. Then, put the above-mentioned rested inner rubber compound into a two-roll mill at 40-50℃, wrap it around the rollers, and add 1.5-2.0 parts of sulfur, 1.0-1.5 parts of accelerator CZ, 0.5-1.0 parts of accelerator DM, and 0.5-1.0 parts of cobalt borylate. Mix until homogeneous and sheet at room temperature for 6-8 hours.

[0027] Furthermore, the specific preparation steps of the outer protective layer material are as follows:

[0028] Add 100 parts of EPDM rubber, 50-60 parts of modified carbon black N330, 10-15 parts of modified nano calcium carbonate, 20-30 parts of kaolin, 5-6 parts of zinc oxide, 1-2 parts of stearic acid, 1.3-1.5 parts of antioxidant RD, and 15-20 parts of paraffin oil to a mixer and mix evenly at 80-90℃. The discharge temperature should be ≤120℃. After sheeting through a two-roll mill, cool to room temperature and let stand for 12-24 hours. Put the above-mentioned rested outer rubber compound into a two-roll mill at 40-50℃, wrap it around the rollers, and add 1.0-1.5 parts of sulfur, 1.0-1.5 parts of accelerator M, and 0.5-1.0 parts of accelerator BZ. Mix until evenly dispersed, and after sheeting, let stand at room temperature for 6-8 hours.

[0029] A method for preparing a high-strength, pressure-resistant steel wire reinforced rubber hose specifically includes the following steps:

[0030] S1. Pretreatment: Wipe the surface of the high-strength steel wire braided reinforcement layer with anhydrous ethanol to remove oil, and dry it at 60℃ for later use; bake the nitrile rubber and EPDM rubber in a 60℃ forced-air drying oven for 3 hours; dry the modified carbon black N330 and modified nano calcium carbonate in a 60℃ vacuum drying oven for 2 hours, and then take them out and cool them for later use.

[0031] S2. Inner Adhesive Layer Extrusion: Cut the inner adhesive layer material into strips and feed them into an extruder with zone 1 at 60°C, zone 2 at 75°C, zone 3 at 85°C, and die head at 90°C. Extrude the inner adhesive layer onto the surface of the chrome-plated hard core, controlling the thickness to 1.8-2.2 mm. After the extruded inner adhesive layer is cooled and shaped in a cooling water bath, apply Chemlock CH205 primer and CH220 topcoat evenly in sequence. Place the primer in a 60°C forced-air drying oven for 10 min and the topcoat for 15 min until the adhesive layer forms a tacky dry film that is not sticky to the touch. Set aside for later use.

[0032] S3, Steel wire reinforcement layer composite: The pretreated high-strength steel wire braided reinforcement layer is evenly covered on the outside of the inner adhesive layer coated with adhesive dry film, and then lightly pressed by a roller pressing device to obtain a steel wire braided reinforcement core tube.

[0033] S4. Extrusion of outer protective layer: Insert the steel wire braided reinforcing core tube into the extruder die set to 65℃ in zone 1, 70℃ in zone 2, 75℃ in zone 3, and 85℃ at the die head. Add the outer protective layer material to the extruder. After plasticizing by the extruder, the outer protective layer is extruded and coated on the outside of the steel wire layer of the steel wire braided reinforcing core tube. Control the thickness to 1.2-1.5mm to ensure that the surface of the outer protective layer is smooth and that it is tightly bonded to the steel wire layer without gaps.

[0034] S5. Vulcanization treatment: The tube blank after extruding the outer rubber is evenly wrapped with polyester vulcanizing water cloth, put into a vulcanizing tank, and vulcanized for 30-40 minutes at 148-150℃ and 1.8-2.0MPa. After cooling, the water cloth is removed and the core is removed to obtain a high-strength pressure-resistant steel wire reinforced rubber hose.

[0035] This invention provides a high-strength, pressure-resistant steel wire reinforced rubber hose and its preparation method, which has the following beneficial effects:

[0036] 1. The high-strength, pressure-resistant steel wire reinforced rubber hose of this invention achieves a strong bond between each layer through a scientific three-layer structure design and an overall co-vulcanization molding process, significantly improving the product's pressure resistance and structural stability. The inner rubber layer uses nitrile rubber with a specific acrylonitrile content, combined with modified carbon black N330 and modified nano-calcium carbonate, giving the inner rubber layer excellent oil resistance, wear resistance, and elasticity; the middle high-strength steel wire braided reinforcement layer uses double-layer high-density braiding with 0.3mm diameter galvanized steel wire, and the precise control of braiding angle and density further enhances the hose's pressure and tensile strength; the outer rubber protective layer is mainly composed of EPDM rubber, combined with fillers such as kaolin, forming a good weather-resistant and anti-aging protective layer. The synergistic effect of the three-layer structure allows the hose to adapt to high-pressure conditions, and the layers are tightly bonded without gaps, making it less prone to interlayer separation.

[0037] 2. This invention, through dual chemical modification of carbon black N330 and nano-calcium carbonate, effectively improves the compatibility and bonding force between the filler and the rubber matrix, significantly enhancing the overall mechanical properties of the rubber material. This results in both the inner and outer rubber layers of the hose possessing high toughness, high wear resistance, and tear resistance. The modified filler is more uniformly dispersed in the rubber matrix, avoiding the performance shortcomings caused by the agglomeration of unmodified fillers. Simultaneously, the addition of cobalt borylate to the inner rubber layer and the rational combination of an accelerator system in the outer rubber layer further optimize the vulcanization effect and crosslinking density of the rubber compound. Compared to rubber hoses using unmodified fillers, this product exhibits significantly improved rubber layer strength and elastic recovery, making it less prone to cracking and wear during long-term use, thus extending the actual service life of the hose.

[0038] 3. The preparation method of this invention has a standardized process and precise controllable parameters, achieving standardization and high efficiency in hose production. The resulting product has strong comprehensive applicability and can meet the needs of various industrial scenarios. From the precise drying of raw material pretreatment to the temperature gradient control of the inner and outer rubber layer extrusion, and the precise temperature and pressure control of the vulcanization process, the parameters of each step have been optimized to ensure stable product molding quality and high dimensional accuracy. Simultaneously, the combination of the oil-resistant inner rubber layer and the weather-resistant outer rubber layer, along with the high-strength compressive strength of the steel wire layer, makes this hose suitable for high-pressure, oil-resistant applications in hydraulic and chemical industries, as well as for fluid transport in outdoor and complex environments. Furthermore, the selection of the bonding system enhances the hose's temperature and pressure resistance, broadening its adaptability to various working environments and significantly improving its practicality and versatility. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the high-strength, pressure-resistant steel wire reinforced rubber hose structure of the present invention.

[0040] In the diagram: 1. Inner adhesive layer; 2. High-strength steel wire braided reinforcement layer; 3. Outer adhesive protective layer. Detailed Implementation

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1: Preparation of high-strength, pressure-resistant steel wire reinforced rubber hose. The specific preparation steps are as follows:

[0043] S1. Pretreatment: Wipe the surface of the high-strength steel wire braided reinforcement layer with anhydrous ethanol to remove oil, and dry it at 60℃ for later use; bake the nitrile rubber and EPDM rubber in a 60℃ forced-air drying oven for 3 hours; dry the modified carbon black N330 and modified nano calcium carbonate in a 60℃ vacuum drying oven for 2 hours, and then take them out and cool them for later use.

[0044] S2. Inner Adhesive Layer Extrusion: The inner adhesive layer material prepared in Example 4 is cut into strips and fed into an extruder with zone 1 at 60°C, zone 2 at 75°C, zone 3 at 85°C, and die head at 90°C. The inner adhesive layer is extruded onto the surface of the chrome-plated hard core, with a thickness controlled at 1.8 mm. After the extruded inner adhesive layer is cooled and shaped in a cooling water bath, it is then uniformly coated with Chemlock CH205 primer and CH220 topcoat in sequence. The primer is dried in a 60°C forced-air drying oven for 10 min and the topcoat for 15 min until the adhesive layer forms a tacky dry film that is not sticky to the touch. It is then ready for use.

[0045] S3, Steel wire reinforcement layer composite: The pretreated high-strength steel wire braided reinforcement layer is evenly covered on the outside of the inner adhesive layer coated with adhesive dry film, and then lightly pressed by a roller pressing device to obtain a steel wire braided reinforcement core tube.

[0046] S4. Extrusion of the outer protective layer: Insert the steel wire braided reinforcing core tube into the extruder die with the temperature set to 65°C in zone 1, 70°C in zone 2, 75°C in zone 3, and 85°C at the die head. Add the outer protective layer material prepared in Example 6 into the extruder. After plasticizing in the extruder, the outer protective layer is extruded and coated on the outside of the steel wire layer of the steel wire braided reinforcing core tube. The thickness is controlled to be 1.2 mm to ensure that the surface of the outer protective layer is smooth and that it is tightly bonded to the steel wire layer without gaps.

[0047] S5. Vulcanization treatment: The tube blank after extruding the outer rubber is evenly wrapped with polyester vulcanizing water cloth, put into a vulcanizing tank, and vulcanized for 30 minutes at 148℃ and 1.8MPa; after cooling, the water cloth is removed and the core is removed to obtain a high-strength pressure-resistant steel wire reinforced rubber hose.

[0048] Example 2: Preparation of high-strength, compression-resistant steel wire reinforced rubber hose. The specific preparation steps are as follows:

[0049] S1. Pretreatment: Wipe the surface of the high-strength steel wire braided reinforcement layer with anhydrous ethanol to remove oil, and dry it at 60℃ for later use; bake the nitrile rubber and EPDM rubber in a 60℃ forced-air drying oven for 3 hours; dry the modified carbon black N330 and modified nano calcium carbonate in a 60℃ vacuum drying oven for 2 hours, and then take them out and cool them for later use.

[0050] S2. Inner Adhesive Layer Extrusion: The inner adhesive layer material prepared in Example 5 is cut into strips and fed into an extruder with zone 1 at 60°C, zone 2 at 75°C, zone 3 at 85°C, and die head at 90°C. The inner adhesive layer is extruded onto the surface of the chrome-plated hard core, with a thickness controlled at 2.2 mm. After the extruded inner adhesive layer is cooled and shaped in a cooling water bath, it is then uniformly coated with Chemlock CH205 primer and CH220 topcoat in sequence. The primer is dried in a 60°C forced-air drying oven for 10 min and the topcoat for 15 min until the adhesive layer forms a tacky dry film that is not sticky to the touch. It is then ready for use.

[0051] S3, Steel wire reinforcement layer composite: The pretreated high-strength steel wire braided reinforcement layer is evenly covered on the outside of the inner adhesive layer coated with adhesive dry film, and then lightly pressed by a roller pressing device to obtain a steel wire braided reinforcement core tube.

[0052] S4. Extrusion of the outer protective layer: Insert the steel wire braided reinforcing core tube into the extruder die with the temperature set to 65°C in zone 1, 70°C in zone 2, 75°C in zone 3, and 85°C at the die head. Add the outer protective layer material prepared in Example 7 into the extruder. After plasticizing in the extruder, the outer protective layer is extruded and coated on the outside of the steel wire layer of the steel wire braided reinforcing core tube. The thickness is controlled to be 1.5 mm to ensure that the surface of the outer protective layer is smooth and that it is tightly bonded to the steel wire layer without gaps.

[0053] S5. Vulcanization treatment: The tube blank after extruding the outer rubber is evenly wrapped with polyester vulcanizing water cloth, put into a vulcanizing tank, and vulcanized for 40 minutes at 150℃ and 2.0MPa; after cooling, the water cloth is removed and the core is removed to obtain a high-strength pressure-resistant steel wire reinforced rubber hose.

[0054] Example 3: Preparation of high-strength, compression-resistant steel wire reinforced rubber hose. The specific preparation steps are as follows:

[0055] S1. Pretreatment: Wipe the surface of the high-strength steel wire braided reinforcement layer with anhydrous ethanol to remove oil, and dry it at 60℃ for later use; bake the nitrile rubber and EPDM rubber in a 60℃ forced-air drying oven for 3 hours; dry the modified carbon black N330 and modified nano calcium carbonate in a 60℃ vacuum drying oven for 2 hours, and then take them out and cool them for later use.

[0056] S2. Inner Adhesive Layer Extrusion: The inner adhesive layer material prepared in Example 5 is cut into strips and fed into an extruder with zone 1 at 60°C, zone 2 at 75°C, zone 3 at 85°C, and die head at 90°C. The inner adhesive layer is extruded onto the surface of the chrome-plated hard core, with a thickness controlled at 2.0 mm. After the extruded inner adhesive layer is cooled and shaped in a cooling water bath, it is then uniformly coated with Chemlock CH205 primer and CH220 topcoat in sequence. The primer is dried in a 60°C forced-air drying oven for 10 min and the topcoat for 15 min until the adhesive layer forms a tacky dry film that is not sticky to the touch. It is then ready for use.

[0057] S3, Steel wire reinforcement layer composite: The pretreated high-strength steel wire braided reinforcement layer is evenly covered on the outside of the inner adhesive layer coated with adhesive dry film, and then lightly pressed by a roller pressing device to obtain a steel wire braided reinforcement core tube.

[0058] S4. Extrusion of the outer protective layer: Insert the steel wire braided reinforcing core tube into the extruder die with the temperature set to 65°C in zone 1, 70°C in zone 2, 75°C in zone 3, and 85°C at the die head. Add the outer protective layer material prepared in Example 6 into the extruder. After plasticizing in the extruder, the outer protective layer is extruded and coated on the outside of the steel wire layer of the steel wire braided reinforcing core tube. The thickness is controlled to be 1.3 mm to ensure that the surface of the outer protective layer is smooth and that it is tightly bonded to the steel wire layer without gaps.

[0059] S5. Vulcanization treatment: The tube blank after extruding the outer rubber is evenly wrapped with polyester vulcanizing water cloth, put into a vulcanizing tank, and vulcanized for 35 minutes at 149℃ and 1.9MPa; after cooling, the water cloth is removed and the core is removed to obtain a high-strength pressure-resistant steel wire reinforced rubber hose.

[0060] Example 4: Preparation of the inner adhesive layer material. The specific preparation steps are as follows:

[0061] 100 parts of nitrile rubber, 40 parts of modified carbon black N330 prepared in Example 8, 10 parts of modified nano-calcium carbonate prepared in Example 10, 5 parts of dioctyl phthalate, 5 parts of zinc oxide, 1 part of stearic acid, 1.3 parts of antioxidant RD, and 1.0 part of antioxidant 4010NA were added to an internal mixer and mixed at 80°C until homogeneous. The discharge temperature was ≤120°C. After sheeting through a two-roll mill, the rubber was cooled to room temperature and left to stand for 12 hours. The inner rubber compound that had been left to stand was then put into a two-roll mill at 40°C. After wrapping the rolls, 1.5 parts of sulfur, 1.0 part of accelerator CZ, 0.5 parts of accelerator DM, and 0.5 parts of cobalt borylate were added and mixed until homogeneous. After sheeting, the rubber compound was left to stand at room temperature for 6 hours.

[0062] Example 5: Preparation of the inner adhesive layer material. The specific preparation steps are as follows:

[0063] 100 parts of nitrile rubber, 50 parts of modified carbon black N330 prepared in Example 8, 15 parts of modified nano-calcium carbonate prepared in Example 10, 10 parts of dioctyl phthalate, 6 parts of zinc oxide, 2 parts of stearic acid, 1.5 parts of antioxidant RD, and 1.2 parts of antioxidant 4010NA were added to an internal mixer and mixed at 90°C until homogeneous. The discharge temperature was ≤120°C. After being sheeted from a two-roll mill, the rubber was cooled to room temperature and left to stand for 24 hours. The inner rubber compound that had been left to stand was then put into a two-roll mill at 50°C. After wrapping the rolls, 2.0 parts of sulfur, 1.5 parts of accelerator CZ, 1.0 parts of accelerator DM, and 1.0 parts of cobalt borylate were added and mixed until homogeneous. After being sheeted, the rubber compound was left to stand at room temperature for 8 hours.

[0064] Example 6: Preparation of the outer protective layer material. The specific preparation steps are as follows:

[0065] 100 parts of EPDM rubber, 50 parts of modified carbon black N330 prepared in Example 8, 10 parts of modified nano-calcium carbonate prepared in Example 10, 20 parts of kaolin, 5 parts of zinc oxide, 1 part of stearic acid, 1.3 parts of antioxidant RD, and 15 parts of paraffin oil were added to an internal mixer and mixed evenly at 80°C. The discharge temperature was ≤120°C. After being sheeted by a two-roll mill, the rubber compound was cooled to room temperature and left to stand for 12 hours. The outer rubber compound after standing was put into a two-roll mill at 40°C. After wrapping the rolls, 1.0 part of sulfur, 1.0 part of accelerator M, and 0.5 part of accelerator BZ were added and mixed until evenly dispersed. After being sheeted, the rubber compound was left to stand at room temperature for 6 hours.

[0066] Example 7: Preparation of the outer protective layer material. The specific preparation steps are as follows:

[0067] 100 parts of EPDM rubber, 60 parts of modified carbon black N330 prepared in Example 8, 15 parts of modified nano-calcium carbonate prepared in Example 10, 30 parts of kaolin, 6 parts of zinc oxide, 2 parts of stearic acid, 1.5 parts of antioxidant RD, and 20 parts of paraffin oil were added to an internal mixer and mixed evenly at 90°C. The discharge temperature was ≤120°C. After being sheeted by a two-roll mill, the rubber compound was cooled to room temperature and left to stand for 24 hours. The outer rubber compound after standing was put into a two-roll mill at 50°C. After wrapping the rolls, 1.5 parts of sulfur, 1.5 parts of accelerator M, and 1.0 part of accelerator BZ were added and mixed until evenly dispersed. After being sheeted, the rubber compound was left to stand at room temperature for 8 hours.

[0068] Example 8: Preparation of modified carbon black N330. The specific preparation steps are as follows:

[0069] A1. Take 100g of high abrasion-resistant carbon black N330, add 10g of concentrated nitric acid and 50g of deionized water, and reflux and stir at 80℃ for 2h. After the reaction is completed, wash repeatedly with deionized water until the pH of the filtrate is neutral, and then dry in a 105℃ forced-air drying oven to constant weight to obtain the first modified carbon black.

[0070] A2. Take all of the first modified carbon black, add 2g of silane coupling agent KH-570, disperse it in 500ml of a mixed solvent of ethanol and water with a volume ratio of 9:1, adjust the pH value to 4.0 with acetic acid, and stir the reaction at 60℃ for 2h. After the reaction is completed, wash three times with anhydrous ethanol to remove the physically adsorbed coupling agent, and then dry it in a vacuum drying oven at 60℃ to constant weight to obtain modified carbon black N330.

[0071] Example 9: Preparation of modified carbon black N330. The specific preparation steps are as follows:

[0072] A1. Take 100g of high abrasion-resistant carbon black N330, add 12g of concentrated nitric acid and 60g of deionized water, and reflux and stir at 90℃ for 2h. After the reaction is completed, wash repeatedly with deionized water until the pH of the filtrate is neutral, and then dry in a 105℃ forced-air drying oven to constant weight to obtain the first modified carbon black.

[0073] A2. Take all of the first modified carbon black, add 3g of silane coupling agent KH-570, disperse it in 500ml of a mixed solvent of ethanol and water with a volume ratio of 9:1, adjust the pH value to 4.5 with acetic acid, and stir the reaction at 60℃ for 2h. After the reaction is completed, wash three times with anhydrous ethanol to remove the physically adsorbed coupling agent, and then dry it in a vacuum drying oven at 60℃ to constant weight to obtain modified carbon black N330.

[0074] Example 10: Preparation of modified nano-calcium carbonate. The specific preparation steps are as follows:

[0075] B1. Add 100g of nano-calcium carbonate to a high-speed mixer, stir at 800r / min, and heat to 100℃; melt 3g of stearic acid and slowly spray it into the mixer, maintain the temperature and continue to stir at high speed for 30min to obtain the first modified nano-calcium carbonate.

[0076] B2. Cool the above system to 90°C, keep the stirring speed at 800 r / min, dilute 2g of aluminate coupling agent DL-411 with 4g of anhydrous ethanol and slowly spray it into the mixer. After reacting for 25 min, maintain the temperature and remove the ethanol for 10 min to obtain the second modified nano calcium carbonate.

[0077] B3. Heat the above system to 110℃, control the stirring speed at 800r / min, premix 5g zinc methacrylate and 0.5g benzoyl peroxide evenly, and slowly spray it into the mixer in two batches. After each spray, maintain the temperature and continue the reaction for 15min. After the reaction is completed, cool to below 40℃ and discharge to obtain modified nano calcium carbonate.

[0078] Example 11: Preparation of modified nano-calcium carbonate. The specific preparation steps are as follows:

[0079] B1. Add 100g of nano-calcium carbonate to a high-speed mixer, stir at 1000r / min, and heat to 110℃; melt 5g of stearic acid and slowly spray it into the mixer, maintain the temperature and continue to stir at high speed for 30min to obtain the first modified nano-calcium carbonate.

[0080] B2. Cool the above system to 100℃, keep the stirring speed at 1000r / min, dilute 4g of aluminate coupling agent DL-411 with 6g of anhydrous ethanol and slowly spray it into the mixer. After reacting for 25min, maintain the temperature and remove the alcohol for 10min to obtain the second modified nano calcium carbonate.

[0081] B3. Heat the above system to 120℃, control the stirring speed at 1000r / min, premix 8g zinc methacrylate and 1.0g benzoyl peroxide evenly, and slowly spray it into the mixer in two batches. After each spray, maintain the temperature and continue the reaction for 20min. After the reaction is completed, cool to below 40℃ and discharge to obtain modified nano calcium carbonate.

[0082] Comparative Example 1: A high-strength, compression-resistant steel wire reinforced rubber hose was prepared. The specific preparation steps are as follows:

[0083] The remaining steps remain unchanged, except that the modified carbon black N330 used in the inner rubber layer material and the outer rubber protective layer material in Example 3 is replaced with unmodified carbon black N330 to prepare a high-strength, pressure-resistant steel wire reinforced rubber hose.

[0084] Comparative Example 2: A high-strength, compression-resistant steel wire reinforced rubber hose was prepared. The specific preparation steps are as follows:

[0085] The remaining steps remain the same, except that the modified nano-calcium carbonate used in the inner rubber layer material and the outer rubber protective layer material in Example 3 is replaced with unmodified nano-calcium carbonate to prepare a high-strength, pressure-resistant steel wire reinforced rubber hose.

[0086] Comparative Example 3: A high-strength, compression-resistant steel wire reinforced rubber hose was prepared. The specific preparation steps are as follows:

[0087] The remaining steps remain unchanged, except that the modified carbon black N330 used in the inner rubber layer material and the outer rubber protective layer material in Example 3 are replaced with unmodified carbon black N330, and the modified nano calcium carbonate used is replaced with unmodified nano calcium carbonate, so as to prepare a high-strength and pressure-resistant steel wire reinforced rubber hose.

[0088] Performance testing Test Project Test Standards Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 <![CDATA[Wear resistance (abrasion loss, cm 3 / 1.61 km)]]> GB / T 9867-2008 0.092 0.088 0.082 0.121 0.135 0.152 Tensile strength (MPa) GB / T 528-2009 25.8 26.5 27.2 22.2 21.8 20.5 Elongation at break (%) GB / T 528-2009 485 492 505 435 410 385 Aging resistance (100℃×72h, tensile strength retention rate%) GB / T 3512-2014 88.2 89.5 91.0 78.2 75.5 72.0 Tear resistance (kN / m) GB / T 529-2008 88 92 95 78 72 68

[0089] The performance test results of the high-strength, compression-resistant steel wire reinforced rubber hose showed that Examples 1-3, which used modified carbon black N330 and modified nano-calcium carbonate, were significantly superior to Comparative Examples 1-3, which used unmodified fillers, in all aspects of performance. Among them, Example 3 had the best overall performance, with an abrasion rate as low as 0.082 cm. 3 The tensile strength reached 27.2 MPa, the elongation at break was 505%, the tensile strength retention rate after aging at 100℃ for 72 hours was 91.0%, and the tear strength was 95 kN / m. In contrast, the unmodified filler in Comparative Example 3 had the worst performance in all aspects, with an abrasion loss as high as 0.152 cm. 3 With a length of 1.61 km and a tensile strength of only 20.5 MPa, and a tear strength of 68 kN / m, it is evident that the modification treatment of the filler can significantly improve the wear resistance, mechanical properties, anti-aging properties, and tear resistance of the hose.

[0090] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A high-strength, pressure-resistant steel wire reinforced rubber hose, characterized in that: The high-strength, pressure-resistant steel wire reinforced rubber hose is integrally co-vulcanized from an inner rubber layer (1), a high-strength steel wire braided reinforcement layer (2), and an outer rubber protective layer (3). The inner rubber layer is mainly composed of nitrile rubber, which is bonded to the high-strength steel wire braided reinforcement layer through Chemlock CH205 and CH220. The outer rubber protective layer is mainly composed of ethylene propylene diene monomer (EPDM) rubber, which fills the braided gaps of the high-strength steel wire braided reinforcement layer and forms a mechanical interlocking structure with the surface of the inner rubber layer.

2. The high-strength, pressure-resistant steel wire reinforced rubber hose according to claim 1, characterized in that: The inner rubber layer comprises the following raw materials in parts by weight: 100 parts nitrile rubber, 40-50 parts modified carbon black N330, 10-15 parts modified nano calcium carbonate, 5-10 parts dioctyl phthalate, 5-6 parts zinc oxide, 1-2 parts stearic acid, 1.3-1.5 parts antioxidant RD, 1.0-1.2 parts antioxidant 4010NA, 1.5-2.0 parts sulfur, 1.0-1.5 parts accelerator CZ, 0.5-1.0 parts accelerator DM, and 0.5-1.0 parts cobalt borylate; The outer protective layer comprises the following raw materials in parts by weight: 100 parts EPDM rubber, 50-60 parts modified carbon black N330, 10-15 parts modified nano calcium carbonate, 20-30 parts kaolin, 15-20 parts paraffin oil, 5-6 parts zinc oxide, 1-2 parts stearic acid, 1.3-1.5 parts antioxidant RD, 1.0-1.5 parts sulfur, 1.0-1.5 parts accelerator M, and 0.5-1.0 parts accelerator BZ; The high-strength steel wire braided reinforcement layer is made of 0.3mm diameter high-strength galvanized steel wire, formed by double-layer braiding, with a braiding angle of 52-56 degrees. Weaving density ≥96%; The adhesive system is Chemlock CH205 and Chemlock CH220.

3. The high-strength, pressure-resistant steel wire reinforced rubber hose according to claim 2, characterized in that: The acrylonitrile content in the nitrile rubber is 33-36%; the Mooney viscosity of the ethylene propylene diene monomer (EPDM) rubber is 40, and the content of 5-ethylidene-2-norbornene is 4.5-5.0%.

4. The high-strength, pressure-resistant steel wire reinforced rubber hose according to claim 2, characterized in that: The modified carbon black N330 is prepared using the following specific steps: A1. Take high abrasion-resistant carbon black N330, add concentrated nitric acid and deionized water, and reflux and stir at 80-90℃ for 2 hours. After the reaction is completed, wash repeatedly with deionized water until the pH of the filtrate is neutral, and then dry in a 105℃ forced-air drying oven to constant weight to obtain the first modified carbon black. A2. Take all of the first modified carbon black, add silane coupling agent KH-570, disperse in a mixed solvent of ethanol and water with a volume ratio of 9:1, adjust the pH value to 4.0-4.5 with acetic acid, and stir the reaction at 60℃ for 2 hours. After the reaction is completed, wash three times with anhydrous ethanol to remove the physically adsorbed coupling agent, and then dry in a vacuum drying oven at 60℃ to constant weight to obtain modified carbon black N330.

5. The high-strength, pressure-resistant steel wire reinforced rubber hose according to claim 4, characterized in that: The ratio of high abrasion-resistant carbon black N330, concentrated nitric acid, and deionized water in A1 is 100g: 10-12g: 50-60g; The ratio of silane coupling agent KH-570 to mixed solvent in A2 is 2-3g:500ml.

6. The high-strength, pressure-resistant steel wire reinforced rubber hose according to claim 2, characterized in that: The modified nano-calcium carbonate is prepared using the following specific steps: B1. Add nano-calcium carbonate to a high-speed mixer, stir at 800-1000 r / min, and heat to 100-110℃; melt stearic acid and slowly spray it into the mixer, maintain the temperature and continue to stir at high speed for 30 min to obtain the first modified nano-calcium carbonate. B2. Cool the above system to 90-100℃, keep the stirring speed at 800-1000r / min, dilute the aluminate coupling agent DL-411 with anhydrous ethanol and slowly spray it into the mixer. After reacting for 25min, maintain the temperature and remove the alcohol for 10min to obtain the second modified nano calcium carbonate. B3. Heat the above system to 110-120℃, control the stirring speed at 800-1000r / min, premix zinc methacrylate and benzoyl peroxide evenly, and slowly spray it into the mixer in two batches. After each spray, maintain the temperature and continue the reaction for 15-20min. After the reaction is completed, cool to below 40℃ and discharge to obtain modified nano calcium carbonate.

7. The high-strength, pressure-resistant steel wire reinforced rubber hose according to claim 6, characterized in that: The ratio of nano-calcium carbonate to stearic acid in B1 is 100g: 3-5g; The ratio of aluminate coupling agent DL-411 to anhydrous ethanol in B2 is 2-4g:4-6g; The ratio of zinc methacrylate to benzoyl peroxide in B3 is 5-8g:0.5-1.0g.

8. The high-strength, pressure-resistant steel wire reinforced rubber hose according to claim 2, characterized in that: The specific preparation steps of the inner adhesive layer material are as follows: Add 100 parts of nitrile rubber, 40-50 parts of modified carbon black N330, 10-15 parts of modified nano calcium carbonate, 5-10 parts of dioctyl phthalate, 5-6 parts of zinc oxide, 1-2 parts of stearic acid, 1.3-1.5 parts of antioxidant RD, and 1.0-1.2 parts of antioxidant 4010NA to a mixer and mix at 80-90℃ until homogeneous. The discharge temperature should be ≤120℃. After sheeting through a two-roll mill, cool to room temperature and let stand for 12-24 hours. Then, put the above-mentioned rested inner rubber compound into a two-roll mill at 40-50℃, wrap it around the rollers, and add 1.5-2.0 parts of sulfur, 1.0-1.5 parts of accelerator CZ, 0.5-1.0 parts of accelerator DM, and 0.5-1.0 parts of cobalt borylate. Mix until homogeneous and sheet at room temperature for 6-8 hours.

9. The high-strength, pressure-resistant steel wire reinforced rubber hose according to claim 2, characterized in that: The specific preparation steps of the outer adhesive protective layer material are as follows: Add 100 parts of EPDM rubber, 50-60 parts of modified carbon black N330, 10-15 parts of modified nano calcium carbonate, 20-30 parts of kaolin, 5-6 parts of zinc oxide, 1-2 parts of stearic acid, 1.3-1.5 parts of antioxidant RD, and 15-20 parts of paraffin oil to a mixer and mix evenly at 80-90℃. The discharge temperature should be ≤120℃. After sheeting through a two-roll mill, cool to room temperature and let stand for 12-24 hours. Put the above-mentioned rested outer rubber compound into a two-roll mill at 40-50℃, wrap it around the rollers, and add 1.0-1.5 parts of sulfur, 1.0-1.5 parts of accelerator M, and 0.5-1.0 parts of accelerator BZ. Mix until evenly dispersed, and after sheeting, let stand at room temperature for 6-8 hours.

10. A method for preparing a high-strength, pressure-resistant steel wire reinforced rubber hose, characterized in that: Specifically, it includes the following steps: S1. Pretreatment: Wipe the surface of the high-strength steel wire braided reinforcement layer with anhydrous ethanol to remove oil, and dry it at 60℃ for later use; bake the nitrile rubber and EPDM rubber in a 60℃ forced-air drying oven for 3 hours; dry the modified carbon black N330 and modified nano calcium carbonate in a 60℃ vacuum drying oven for 2 hours, and then take them out and cool them for later use. S2. Inner Adhesive Layer Extrusion: Cut the inner adhesive layer material into strips and feed them into an extruder with zone 1 at 60°C, zone 2 at 75°C, zone 3 at 85°C, and die head at 90°C. Extrude the inner adhesive layer onto the surface of the chrome-plated hard core, controlling the thickness to 1.8-2.2 mm. After the extruded inner adhesive layer is cooled and shaped in a cooling water bath, apply Chemlock CH205 primer and CH220 topcoat evenly in sequence. Place the primer in a 60°C forced-air drying oven for 10 min and the topcoat for 15 min until the adhesive layer forms a tacky dry film that is not sticky to the touch. Set aside for later use. S3, Steel wire reinforcement layer composite: The pretreated high-strength steel wire braided reinforcement layer is evenly covered on the outside of the inner adhesive layer coated with adhesive dry film, and then lightly pressed by a roller pressing device to obtain a steel wire braided reinforcement core tube. S4. Extrusion of outer protective layer: Insert the steel wire braided reinforcing core tube into the extruder die set to 65℃ in zone 1, 70℃ in zone 2, 75℃ in zone 3, and 85℃ at the die head. Add the outer protective layer material to the extruder. After plasticizing by the extruder, the outer protective layer is extruded and coated on the outside of the steel wire layer of the steel wire braided reinforcing core tube. Control the thickness to 1.2-1.5mm to ensure that the surface of the outer protective layer is smooth and that it is tightly bonded to the steel wire layer without gaps. S5. Vulcanization treatment: The tube blank after extruding the outer rubber is evenly wrapped with polyester vulcanizing water cloth, put into a vulcanizing tank, and vulcanized for 30-40 minutes at 148-150℃ and 1.8-2.0MPa. After cooling, the water cloth is removed and the core is removed to obtain a high-strength pressure-resistant steel wire reinforced rubber hose.

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