Flame-retardant antistatic rubber tube material and preparation method and application thereof

Abstract

The application relates to the technical field of rubber, and discloses a kind of flame-retardant antistatic rubber tube materials and preparation method and its application, the flame-retardant antistatic rubber tube material of the application includes 60-75 parts of ethylene-propylene-diene rubber, 25-40 parts of chlorinated polyethylene, 10-25 parts of polyphosphate ester flame retardant, 3.2-3.7 parts of composite vulcanizing agent and the like.The polyphosphate ester flame retardant of the application contains a large number of hydrophilic amide bonds and ether bonds, which are uniformly dispersed in the material matrix, can improve the moisture absorption of the material surface, form a conductive hydrated film, promote the dissipation of electric charge, thereby reducing the surface resistivity, and is beneficial to improving the antistatic performance.The polyphosphate ester flame retardant contains phosphate groups and a large number of nitrogen elements, plays a nitrogen-phosphorus synergistic flame-retardant role, and improves the flame-retardant performance of the rubber tube.

Description

Technical Field

[0001] This invention relates to the field of rubber technology, specifically to a flame-retardant and antistatic rubber tube material, its preparation method, and its application. Background Technology

[0002] Rubber hoses possess advantages such as good flexibility, high mechanical strength, strong corrosion resistance, and excellent heat resistance, making them widely used in hydraulic pipes, electrical cables, agricultural irrigation, and chemical transportation. The main materials used in rubber hoses include EPDM rubber, chlorinated polyethylene, silicone rubber, and nitrile rubber. EPDM rubber and chlorinated polyethylene exhibit good compatibility, and blends of the two offer advantages such as high-temperature resistance, aging resistance, solvent resistance, and flame retardancy. However, both EPDM rubber and chlorinated polyethylene have relatively high resistivity and poor antistatic properties. Furthermore, EPDM rubber is easily flammable, and even when blended with chlorinated polyethylene, its flame retardancy is poor, limiting the practical application of blends of the two.

[0003] Adding flame retardants and antistatic agents to ethylene propylene diene monomer (EPDM) rubber and chlorinated polyethylene (CPE) can improve their flame retardant and antistatic properties. Patent CN116462918B discloses an insulated rubber-sheathed cable repair strip, its preparation method, and its application. This strip mixes chlorinated polyethylene, EPDM rubber, flame retardants, and vulcanizing agents to obtain a sheathing repair material with good flame retardant properties. However, this patent does not address the issue of the low antistatic properties of chlorinated polyethylene and EPDM rubber. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a flame-retardant and antistatic rubber tube material, its preparation method, and its application, solving the problem of low flame-retardant properties of EPDM rubber.

[0005] The technical solution of the present invention is: a flame-retardant and antistatic rubber tube material, comprising the following components in parts by weight: 60-75 parts EPDM rubber, 25-40 parts chlorinated polyethylene, 30-50 parts reinforcing agent, 10-25 parts polyphosphate flame retardant, 3.2-4 parts composite activator, 2.8-4.5 parts acid absorber, 0.7-1.2 parts stabilizer, 4-6 parts filler oil, 1.6-2.3 parts antioxidant, and 3.2-3.7 parts composite vulcanizing agent.

[0006] The preparation method of flame-retardant and antistatic rubber tubing material is as follows:

[0007] (1) Add tetrahydrofuran and dimethyl N,N-bis(2-hydroxyethyl)aminomethylenephosphonate to a flask, add an aqueous solution of potassium hydroxide dropwise, and then add chloroacetic acid, controlling the molar ratio of dimethyl N,N-bis(2-hydroxyethyl)aminomethylenephosphonate, potassium hydroxide, and chloroacetic acid to be 1:(4-4.2):(2-2.2); heat to 70-80℃, stir the reaction for 3-4 hours, add hydrochloric acid solution to adjust the pH to 4-5, extract with dichloromethane, evaporate the organic layer by rotary evaporation, separate by column chromatography, and elute with ethyl acetate-petroleum ether solution to obtain dimethyl N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate. The reaction formula is:

[0008] .

[0009] (2) Add dimethyl N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate and diamine in a molar ratio of 1:(1.04-1.08) to the reactor, heat to 150-160℃, prepolymerize for 30-40 min, then evacuate and heat to 200-220℃ for condensation polymerization for 2-3 h. Discharge, cool, wash with petroleum ether, and dry to obtain polyphosphate flame retardant. The reaction formula is:

[0010] .

[0011] (3) Add chlorinated polyethylene and polyphosphate flame retardant to the open mill, with a roller temperature of 50-60℃, and mix for 2-3 minutes. Then add EPDM rubber and mix for 4-6 minutes. Add reinforcing agent, composite activator, acid absorber, stabilizer, filler oil, and antioxidant, and continue mixing for 4-5 minutes. Finally, add composite vulcanizing agent, thin pass, triangular wrap, and sheet. Finally, vulcanize in a flat vulcanizing machine at a pressure of 10-15MPa and a temperature of 160-170℃ for 15-20 minutes to obtain flame-retardant and antistatic rubber pipe material.

[0012] Preferably, the diamine in (1) includes ethylenediamine, propylenediamine, butanediamine, pentanediamine or hexanediamine.

[0013] Preferably, the reinforcing agent includes silica, carbon black, or calcium carbonate.

[0014] Preferably, the composite activator includes stearic acid and zinc oxide.

[0015] Preferably, the acid absorbent includes magnesium oxide, and the filler oil includes paraffin oil.

[0016] Preferably, the stabilizer includes tribasic lead sulfate and dibasic lead phosphite.

[0017] Preferably, the antioxidants include antioxidant RD, antioxidant 4010NA, and antioxidant MB.

[0018] Preferably, the composite vulcanizing agent includes dicumyl peroxide and sulfur.

[0019] Preferred application of flame-retardant and antistatic rubber hose materials in hydraulic hoses.

[0020] The beneficial technical effects of this invention are as follows: Dimethyl N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate and diamine are polymerized to obtain a polyphosphate flame retardant. This flame retardant is then mixed with chlorinated polyethylene, EPDM rubber, reinforcing agents, and vulcanizing agents to obtain a flame-retardant and antistatic rubber hose material. The polyphosphate flame retardant's main chain contains a large number of amide bonds, which form hydrogen bonds with the polar chlorine atoms of chlorinated polyethylene during the mixing process. Simultaneously, during high-temperature vulcanization, the terminal amino groups of the polyphosphate flame retardant react with the chlorine atoms of chlorinated polyethylene, significantly enhancing the interfacial bonding between chlorinated polyethylene and the polyphosphate flame retardant. Chlorinated polyethylene and EPDM rubber have similar polyolefin main chains and good compatibility. Under the influence of chlorinated polyethylene, the polyphosphate flame retardant also exhibits good compatibility with EPDM rubber. The flame retardant can be uniformly dispersed in the rubber hose material with minimal impact on the material's mechanical properties, maintaining good tensile strength and elongation at break.

[0021] The polyphosphate flame retardant of this invention contains a large number of hydrophilic amide and ether bonds, which are uniformly dispersed in the material matrix. This improves the hygroscopicity of the material surface, forms a conductive hydration film, promotes charge dissipation, and thus reduces surface resistivity, which is beneficial for improving antistatic properties. The polyphosphate flame retardant also contains phosphate groups and a large amount of nitrogen, resulting in a synergistic nitrogen-phosphorus flame retardant effect, which improves the limiting oxygen index of the rubber hose and enhances its flame retardant performance. Detailed Implementation

[0022] The above are merely six specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the scope of protection of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

[0023] N,N-bis(2-hydroxyethyl)aminomethylenephosphonate dimethyl ester (flame retardant FR-1) was prepared according to the method described in the Master's thesis of Donghua University, "Preparation and Application Performance Study of Phosphate Ester Flame Retardant Finishing Agents for Cotton". The structural formula is as follows: .

[0024] Example 1:

[0025] (1) Add 100 mL of tetrahydrofuran and 0.4 mol of N,N-bis(2-hydroxyethyl)aminomethylenephosphonate dimethyl ester to a flask, add 120 mL of aqueous solution containing 1.68 mol of potassium hydroxide dropwise, then add 0.88 mol of chloroacetic acid, heat to 80 °C, stir and reflux for 3 h, adjust the pH to 4 by adding 20% ​​hydrochloric acid solution dropwise, extract with dichloromethane, evaporate the organic layer by rotary evaporation, separate by column chromatography, and elute with ethyl acetate-petroleum ether solution to obtain N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate dimethyl ester.

[0026] (2) Add 0.25 mol N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonic acid dimethyl ester and 0.26 mol ethylenediamine to the reactor, heat to 150°C, prepolymerize for 40 min, then vacuum and heat to 210°C for 2 h of polycondensation reaction, discharge, cool, wash with petroleum ether, dry to obtain polyphosphate flame retardant.

[0027] (3) Add 250g of chlorinated polyethylene (model CPE-135A, Henan Anno Chemical Technology Co., Ltd., the same below) and 100g of polyphosphate flame retardant to the open mill. The roller temperature is 55℃. Mix for 2 minutes. Then add 750g of EPDM rubber (model Dow EPDM3640, Shandong Apu Chemical Technology Co., Ltd., the same below) and mix for 5 minutes. Add 400g of silica, 6g of stearic acid, 34g of zinc oxide, 28g of magnesium oxide, 7g of tribasic lead sulfate, 50g of paraffin oil, and 16g of antioxidant MB. Continue mixing for 5 minutes. Finally, add 30g of dicumyl peroxide and 4g of sulfur. Pass through the mill, form a triangular package, and cut into sheets. Finally, vulcanize in a flat vulcanizing machine at 170℃ for 15 minutes under a pressure of 10MPa to obtain flame-retardant and antistatic rubber pipe material.

[0028] Example 2:

[0029] (1) Add 150 mL of tetrahydrofuran and 1 mol of N,N-bis(2-hydroxyethyl)aminomethylenephosphonate dimethyl ester to a flask, add 150 mL of aqueous solution containing 2.4 mol of potassium hydroxide dropwise, then add 1.2 mol of chloroacetic acid, heat to 70 °C, stir and reflux for 4 h, adjust the pH to 5 by adding 20% ​​hydrochloric acid solution dropwise, extract and separate with dichloromethane, rotary evaporate the organic layer, separate by column chromatography, and elute with ethyl acetate-petroleum ether solution to obtain N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate dimethyl ester.

[0030] (2) Add 0.4 mol N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonic acid dimethyl ester and 0.432 mol butanediamine to the reactor, heat to 150°C, prepolymerize for 40 min, then vacuum and heat to 200°C for 3 h of polycondensation reaction, discharge, cool, wash with petroleum ether, dry to obtain polyphosphate flame retardant.

[0031] (3) Add 400g of chlorinated polyethylene and 200g of polyphosphate flame retardant to the open mill, with a roller temperature of 50℃, and mix for 3 minutes. Then add 600g of EPDM rubber and mix for 6 minutes. Add 500g of silica, 5g of stearic acid, 32g of zinc oxide, 45g of magnesium oxide, 12g of dibasic lead phosphite, 40g of paraffin oil, and 20g of antioxidant RD. Continue mixing for 5 minutes. Finally, add 29g of dicumyl peroxide and 3g of sulfur. Pass through the mill, form a triangular package, and cut into sheets. Finally, vulcanize in a flat vulcanizing machine at a pressure of 10MPa and 170℃ for 15 minutes to obtain flame-retardant and antistatic rubber pipe material.

[0032] Example 3:

[0033] (1) Add 200 mL of tetrahydrofuran and 0.7 mol of N,N-bis(2-hydroxyethyl)aminomethylenephosphonate dimethyl ester to a flask, add 220 mL of aqueous solution containing 2.94 mol of potassium hydroxide dropwise, then add 1.4 mol of chloroacetic acid, heat to 75 °C, stir and reflux for 4 h, adjust the pH to 4 by adding 20% ​​hydrochloric acid solution dropwise, extract and separate with dichloromethane, rotary evaporate the organic layer, separate by column chromatography, and elute with ethyl acetate-petroleum ether solution to obtain N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate dimethyl ester.

[0034] (2) Add 0.5 mol N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonic acid dimethyl ester and 0.53 mol ethylenediamine to the reactor, heat to 160°C, prepolymerize for 30 min, then vacuum and heat to 220°C for 2 h of polycondensation reaction, discharge, cool, wash with petroleum ether, dry to obtain polyphosphate flame retardant.

[0035] (3) Add 300g of chlorinated polyethylene and 250g of polyphosphate flame retardant to the open mill, with a roller temperature of 60℃, and mix for 2 minutes. Then add 700g of EPDM rubber and mix for 4 minutes. Add 300g of calcium carbonate, 5g of stearic acid, 27g of zinc oxide, 31g of magnesium oxide, 9g of tribasic lead sulfate, 60g of paraffin oil, and 23g of antioxidant 4010NA. Continue mixing for 4 minutes. Finally, add 33g of dicumyl peroxide and 4g of sulfur. Pass through the mill, form a triangular package, and cut into sheets. Finally, vulcanize in a flat vulcanizing machine at a pressure of 10MPa and 160℃ for 20 minutes to obtain flame-retardant and antistatic rubber pipe material.

[0036] Comparative Example 1:

[0037] (1) Add 250g of chlorinated polyethylene and 750g of EPDM rubber to the open mill. The roller temperature is 55℃. Mix for 5 minutes. Add 400g of silica, 6g of stearic acid, 34g of zinc oxide, 28g of magnesium oxide, 7g of tribasic lead sulfate, 50g of paraffin oil, and 16g of antioxidant MB. Continue mixing for 5 minutes. Finally, add 30g of dicumyl peroxide and 4g of sulfur. Pass through the mill, form a triangular package, and cut into sheets. Finally, vulcanize in a flat vulcanizing machine at 170℃ for 15 minutes under a pressure of 10MPa to obtain the rubber hose material.

[0038] Comparative Example 2:

[0039] (1) Add 250g of chlorinated polyethylene and 100g of N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonic acid dimethyl ester (prepared according to the method of Example 1) to a two-roll mill. The roller temperature is 55℃. Mix for 2 minutes. Then add 750g of EPDM rubber and mix for 5 minutes. Add 400g of silica, 6g of stearic acid, 34g of zinc oxide, 28g of magnesium oxide, 7g of tribasic lead sulfate, 50g of paraffin oil, and 16g of antioxidant MB. Continue mixing for 5 minutes. Finally, add 30g of dicumyl peroxide and 4g of sulfur. Pass through the mill, form a triangular package, and cut into sheets. Finally, vulcanize in a flat vulcanizing machine at 170℃ for 15 minutes under a pressure of 10MPa to obtain rubber tube material.

[0040] Comparative Example 3:

[0041] (1) Add 0.25 mol adipic acid and 0.26 mol ethylenediamine to the reactor, heat to 150°C, prepolymerize for 40 min, then vacuum and heat to 210°C for 2 h of polycondensation reaction, discharge, cool, wash with petroleum ether, dry, and obtain polyamide.

[0042] (2) Add 250g of chlorinated polyethylene and 100g of polyamide to the open mill, with a roller temperature of 55℃, and mix for 2 minutes. Then add 750g of EPDM rubber and mix for 5 minutes. Add 400g of silica, 6g of stearic acid, 34g of zinc oxide, 28g of magnesium oxide, 7g of tribasic lead sulfate, 50g of paraffin oil, and 16g of antioxidant MB. Continue mixing for 5 minutes. Finally, add 30g of dicumyl peroxide and 4g of sulfur. Pass through the mill, form a triangular package, and cut into sheets. Finally, vulcanize in a flat vulcanizing machine at a pressure of 10MPa and 170℃ for 15 minutes to obtain the rubber hose material.

[0043] Comparative Example 4:

[0044] (1) Add 0.25 mol of 3,6-dioxanoic acid and 0.26 mol of ethylenediamine to the reactor, heat to 150°C, prepolymerize for 40 min, then vacuum and heat to 210°C for 2 h of polycondensation reaction, discharge, cool, wash with petroleum ether, dry, and obtain polyamide.

[0045] (2) Add 250g of chlorinated polyethylene and 100g of polyamide to the open mill, with a roller temperature of 55℃, and mix for 2 minutes. Then add 750g of EPDM rubber and mix for 5 minutes. Add 400g of silica, 6g of stearic acid, 34g of zinc oxide, 28g of magnesium oxide, 7g of tribasic lead sulfate, 50g of paraffin oil, and 16g of antioxidant MB. Continue mixing for 5 minutes. Finally, add 30g of dicumyl peroxide and 4g of sulfur. Pass through the mill, form a triangular package, and cut into sheets. Finally, vulcanize in a flat vulcanizing machine at a pressure of 10MPa and 170℃ for 15 minutes to obtain the rubber hose material.

[0046] The combustion performance was tested according to GB / T 10707-2008 standard. The surface resistivity of the rubber hose material was tested according to GB / T 40719-2021 method. The mechanical properties of the rubber hose material were tested according to standard GB / T 528-2009.

[0047] Table 1 Properties of Rubber Hose Materials

[0048] Example 1 27.6 <![CDATA[7.79×10 15 ]]> 14.4 527.3 Example 2 29.5 <![CDATA[8.60×10 13 ]]> 12.1 584.5 Example 3 29.2 <![CDATA[4.27×10 12 ]]> 19.4 412.8 Comparative Example 1 22.8 <![CDATA[2.54×10 17 ]]> 14.8 512.7 Comparative Example 2 27.3 <![CDATA[9.32×10 15 ]]> 12.6 445.6 Comparative Example 3 22.1 <![CDATA[3.18×10 16 ]]> 15.2 506.9 Comparative Example 4 21.7 <![CDATA[6.23×10 15 ]]> 14.1 531.0

[0049] In each embodiment, a polyphosphate flame retardant was added to the EPDM-chlorinated polyethylene rubber hose material. Its main chain contains a large number of amide bonds, which form hydrogen bonds with the polar chlorine atoms of chlorinated polyethylene during the mixing process. Simultaneously, during high-temperature vulcanization, the terminal amino groups of the polyphosphate flame retardant react with the chlorine atoms of chlorinated polyethylene, significantly enhancing the interfacial bonding between chlorinated polyethylene and the polyphosphate flame retardant. Chlorinated polyethylene and EPDM have similar polyolefin main chains, exhibiting good compatibility. Under the influence of chlorinated polyethylene, the polyphosphate flame retardant also exhibits good compatibility with EPDM, allowing the flame retardant to be uniformly dispersed in the rubber hose material with minimal impact on its mechanical properties, maintaining good tensile strength and elongation at break. Furthermore, the polyphosphate flame retardant contains a large number of hydrophilic amide and ether bonds, which, when uniformly dispersed in the material matrix, can improve the hygroscopicity of the material surface, forming a conductive hydration film, promoting charge dissipation, and thus reducing surface resistivity significantly lower than in Comparative Example 1, thereby improving antistatic properties. Polyphosphate flame retardants contain phosphate groups and a large amount of nitrogen, which play a synergistic role in flame retardancy, improving the limiting oxygen index of rubber hoses, which is significantly higher than that of comparative example 1, thus improving flame retardant performance.

[0050] Comparative Example 2, which incorporates dimethyl N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate, exhibits poor compatibility and dispersibility with EPDM rubber and chlorinated polyethylene, severely impacting the rubber tube material and mechanical properties. Tensile strength and elongation at break decrease, and the surface resistivity is higher than in Example 1, resulting in poor antistatic properties.

[0051] The adipic acid in Comparative Example 3 and the prepared polyamide do not contain flame-retardant phosphate groups and hydrophilic ether bonds, resulting in a low limiting oxygen index and a high surface resistivity.

[0052] The 3,6-dioxanoic acid and the prepared polyamide in Comparative Example 4 do not contain flame-retardant phosphate groups, resulting in a low limiting oxygen index and poor flame retardancy of the material.

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A flame-retardant and antistatic rubber tubing material, characterized in that, The flame-retardant and antistatic rubber tubing material comprises the following components in parts by weight: 60-75 parts EPDM rubber, 25-40 parts chlorinated polyethylene, 30-50 parts reinforcing agent, 10-25 parts polyphosphate flame retardant, 3.2-4 parts composite activator, 2.8-4.5 parts acid absorber, 0.7-1.2 parts stabilizer, 4-6 parts filler oil, 1.6-2.3 parts antioxidant, and 3.2-3.7 parts composite vulcanizing agent; The preparation method of the polyphosphate flame retardant is as follows: N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonic acid dimethyl ester and diamine are added to the reaction vessel in a molar ratio of 1:(1.04-1.08) to carry out a prepolymerization reaction, and then a condensation reaction is carried out under vacuum. After discharge, cooling, washing and drying, the polyphosphate flame retardant is obtained. The N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate dimethyl ester was prepared as follows: tetrahydrofuran and N,N-bis(2-hydroxyethyl)aminomethylenephosphonate dimethyl ester were added to a flask, an aqueous solution of potassium hydroxide was added dropwise, then chloroacetic acid was added, the mixture was heated to 70-80℃, stirred for 3-4 hours, hydrochloric acid solution was added dropwise to adjust the pH to 4-5, the mixture was extracted and separated with dichloromethane, the organic layer was rotary evaporated, and the mixture was separated by column chromatography to obtain N,N-bis(2-carboxymethyloxyethyl)aminomethylenephosphonate dimethyl ester; The molar ratio of N,N-bis(2-hydroxyethyl)aminomethylenephosphonic acid dimethyl ester, potassium hydroxide, and chloroacetic acid is 1:(4-4.2):(2-2.2).

2. The flame-retardant and antistatic rubber tubing material according to claim 1, characterized in that, The prepolymerization reaction is carried out by heating to 150-160℃ for 30-40 minutes; the polycondensation reaction is carried out by heating to 200-220℃ for 2-3 hours.

3. The flame-retardant and antistatic rubber tubing material according to claim 1, characterized in that, The diamine is ethylenediamine, propylenediamine, butanediamine, pentanediamine, or hexanediamine.

4. The flame-retardant and antistatic rubber tubing material according to claim 1, characterized in that, The reinforcing agent is silica, carbon black, or calcium carbonate; the composite activator includes stearic acid and zinc oxide.

5. The flame-retardant and antistatic rubber tubing material according to claim 1, characterized in that, The acid absorber is magnesium oxide, and the filler oil is paraffin oil; the stabilizer includes tribasic lead sulfate and dibasic lead phosphite.

6. The flame-retardant and antistatic rubber tubing material according to claim 1, characterized in that, The antioxidant is antioxidant RD, antioxidant 4010NA, or antioxidant MB; the composite vulcanizing agent includes dicumyl peroxide and sulfur.

7. A method for preparing a flame-retardant and antistatic rubber tubing material as described in any one of claims 1-6, characterized in that, The preparation method is as follows: Chlorinated polyethylene and polyphosphate flame retardant are added to a two-roll mill at a roller temperature of 50-60℃ and mixed for 2-3 minutes. Then, EPDM rubber is added and mixed for 4-6 minutes. Reinforcing agent, composite activator, acid absorber, stabilizer, filler oil, and antioxidant are added and mixed for another 4-5 minutes. Finally, composite vulcanizing agent is added, and the mixture is thinly sheeted, formed into triangular wraps, and then placed in a flat vulcanizing machine at a pressure of 10-15MPa and a temperature of 160-170℃ for 15-20 minutes to obtain flame-retardant and antistatic rubber tube material.

8. The application of a flame-retardant and antistatic rubber hose material obtained by the preparation method as described in claim 7 in hydraulic hoses.