Super-cold-resistant and low-temperature-resistant rubber cable material and preparation method thereof

Abstract

The invention discloses a super-cold-resistant and low-temperature-resistant rubber cable material and a preparation method thereof. The cable material comprises the following raw materials in parts by weight: 20-35 parts of a first rubber base material, 8-15 parts of a second rubber base material, 2-4 parts of an accelerant, 0.3-0.5 part of a stabilizer, 1.5-3 parts of a first plasticizer, 3-5 parts of a second plasticizer, 2-4 parts of a third plasticizer, 0.3-0.5 part of a cold-resistant toughening agent, 0.3-1.0 part of an anti-aging agent, 0.8-2 parts of a vulcanizing agent, 2-4 parts of a flame retardant, 25-42 parts of a filler and 3-8 parts of a reinforcing agent. According to the invention, reasonable raw materials are screened, formula components are optimized, and the cold-resistant flexibilizer and the flame retardant are added, so that the toughness of the rubber is increased, good mechanical properties are maintained, the problem of low-temperature brittleness of the rubber is effectively solved, and meanwhile, the rubber has flame retardant property, does not spread combustion when encountering flame, ensures continuous power supply when a cable is in a fire disaster, and improves the service life of the cable. The low-temperature catalytic performance of the rubber is improved, the processing technology is simple, and the market application prospect is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of cable materials, and in particular relates to an ultra-cold-resistant and low-temperature-resistant rubber cable material and a preparation method thereof. Background Art

[0002] Rubber has a very wide range of applications. It has the advantages of high strength, plasticity, corrosion resistance, flame retardancy, good insulation, and easy processing. Various rubber products can be produced by adding appropriate additives and using appropriate equipment. At present, general cable material manufacturers have basically mastered the production of rubber cable materials that meet the GB / T 7594-1987 standard. Conventional rubber cable materials mainly use chlorinated polyethylene and EPDM as the main base material, add small molecular weight plasticizers, and stearate stabilizers. The rubber films, particles and performances produced meet the requirements of national standards. However, chlorinated polyethylene and EPDM are prone to embrittlement in low temperature environments, which can easily cause the rubber to lose its original elasticity and electrical properties. Traditional rubber cable materials can no longer meet the personalized needs of the market. Summary of the invention

[0003] The purpose of the present invention is to provide a super cold-resistant and low-temperature-resistant rubber cable material and a preparation method thereof in view of the deficiencies of the prior art. The present invention selects suitable raw materials and reasonably matches the components and their dosage ratios in the formula to obtain a super cold-resistant and low-temperature-resistant rubber cable material. The rubber cable material also takes into account the properties of heat resistance, flame retardancy, and easy processing. Its physical and chemical properties are better than those of ordinary rubber, and it has good economic benefits.

[0004] The super cold-resistant and low-temperature-resistant rubber cable material provided by the present invention comprises the following raw materials in parts by weight: 20-35 parts of a first rubber base material, 8-15 parts of a second rubber base material, 2-4 parts of an accelerator, 0.3-0.5 parts of a stabilizer, 1.5-3 parts of a first plasticizer, 3-5 parts of a second plasticizer, 2-4 parts of a third plasticizer, 0.3-0.5 parts of a cold-resistant toughening agent, 0.3-1.0 parts of an antioxidant, 0.8-2 parts of a vulcanizer, 2-4 parts of a flame retardant, 25-42 parts of a filler, and 3-8 parts of a reinforcing agent.

[0005] Preferably, the first rubber base material is butadiene rubber, which has the characteristics of high elasticity, good wear resistance, good cold resistance, low heat generation, good flexural resistance and good dynamic performance.

[0006] Preferably, the second rubber base material is natural rubber / styrene-butadiene rubber, wherein the weight ratio of natural rubber to styrene-butadiene rubber is 1: 1. In the present invention, natural rubber / styrene-butadiene rubber refers to a mixed rubber of natural rubber and styrene-butadiene rubber, the mixed rubber has wear resistance, heat resistance and aging resistance, and the addition of cis-butadiene rubber to the mixed rubber can improve the softness and strength of the rubber.

[0007] Preferably, the accelerator is zinc oxide, which has activation, reinforcement and anti-aging effects, can strengthen the vulcanization process, and improve the tear resistance and wear resistance of rubber products.

[0008] Preferably, the stabilizer is stearic acid, which is conducive to the full diffusion of other raw materials such as carbon black, white carbon black, zinc oxide, and vulcanizing agent, so that the performance of the rubber is stable after vulcanization.

[0009] Preferably, the first plasticizer is polyethylene wax. Polyethylene wax can increase the dispersion of fillers, improve the kneading molding rate, and increase the mold flow rate to make demoulding smooth.

[0010] Preferably, the second plasticizer is chlorinated paraffin oil. Chlorinated paraffin oil facilitates material shaping, paraffin acts as a lubricant during processing, and surfactants can improve the compatibility between organic and inorganic substances in the material components, so that the various material components are fully and evenly mixed, improving the physical and mechanical properties of the material, and having flame retardant properties.

[0011] Preferably, the third plasticizer is dioctyl phthalate (DOP), which has high plasticizing efficiency, low volatility, light resistance, water resistance, cold resistance, and good electrical properties and flexibility.

[0012] Preferably, the cold-resistant toughening agent is ethylene-butyl-hydroxy acrylate. Ethylene-butyl-hydroxy acrylate can increase the strength and softness of rubber products at low temperatures.

[0013] Preferably, the antioxidant is at least one of dibenzothiazole disulfide (DM), zinc diethyldithiocarbamate (ZDC), and 2,2,4-trimethyl-1,2-dihydroquinoline polymer (RD). Adding an antioxidant during rubber processing can prevent rubber aging and has an inhibitory effect on light, heat, oxygen, and metal ions.

[0014] Preferably, the vulcanizing agent is tetramethylthiuram disulfide (TMTD). The vulcanizing agent promotes rubber vulcanization, allowing rubber linear molecules to form network structure molecules, thereby improving the mechanical and physical properties and electrical properties of the vulcanized rubber.

[0015] Preferably, the flame retardant is antimony trioxide. Antimony trioxide is used to improve the flame retardant properties of the rubber sheath material. Antimony trioxide generates antimony trichloride (Sb2Cl3), which can be used as a free radical scavenger in the gas phase combustion zone, and can effectively capture the free radicals generated by the combustion of the polymer, thus playing a flame retardant role.

[0016] Preferably, the filler is at least one of light calcium carbonate, ultrafine talc, and calcined clay, and its purpose is to increase the volume, modify, and reinforce the rubber.

[0017] Preferably, the reinforcing agent is at least one of white carbon black, N330 carbon black, and N550 carbon black, and its function is to improve the tensile resistance, tear resistance, impact resistance, wear resistance, bending resistance and other properties of the rubber.

[0018] The present invention also provides a method for preparing the cable material, comprising the following steps:

[0019] 1) Obtain each raw material and accurately weigh each raw material according to the formula ratio;

[0020] 2) putting the weighed second rubber base material into an open mixing mill for thin-pass plastication;

[0021] 3) Then add the first rubber base material, the first plasticizer, the second plasticizer, the third plasticizer, the antioxidant, the stabilizer, the flame retardant, the accelerator, the cold-resistant toughening agent, the filler, and the reinforcing agent to the internal mixer for mixing, and then add the vulcanizing agent, mix well and discharge the glue;

[0022] 4) The arranged rubber is put into the open mixing mill for automatic mixing, and the mixed rubber is spread into sheets.

[0023] Preferably, in step 2), the mastication time is 15 to 20 minutes.

[0024] Preferably, in step 3), the mixing time is 5 to 8 minutes and the temperature is 90 to 100°C.

[0025] Preferably, in step 3), after adding the vulcanizing agent, the temperature is controlled at 100-110° C., kept warm for 2-3 minutes, and then the temperature is controlled at 110-120° C., and mixed evenly to remove the glue.

[0026] Preferably, in step 4), the mixing is performed 3-4 times.

[0027] Principles and beneficial effects of the present invention:

[0028] The invention selects reasonable raw materials and optimizes the formula components. In the rubber cable material, cold-resistant rubber butadiene rubber is blended with natural rubber / styrene butadiene rubber, thereby improving the ultra-low temperature resistance of the rubber material and the softness of the rubber material at low temperatures; by adding a cold-resistant toughening agent, the physical properties and chemical properties of the rubber are changed, the cold resistance and toughness of the rubber are improved, good mechanical properties are maintained, and the problem of low-temperature brittleness of the rubber is effectively compensated; flame retardant antimony trioxide and plasticizer chlorinated paraffin oil are added, the chlorinated paraffin oil generates hydrogen chloride (HCl) during the decomposition process, the hydrogen chloride (HCl) reacts with antimony trioxide to generate antimony trichloride, and the antimony trichloride can capture the flame retardant antimony trioxide in the gas phase. Active free radicals change the gas phase reaction mode, inhibit the combustion process, achieve the flame retardant performance of rubber, and also have flame retardant and fireproof performance in low temperature environment; adding stearic acid is conducive to the full diffusion of raw materials such as carbon black, zinc oxide, vulcanizer, antioxidant, etc., and enhances the stability of rubber after vulcanization. Zinc oxide can not only accelerate the vulcanization speed, but also increase the crosslinking degree, and has an activation effect on tetramethylthiuram disulfide (TMTD) vulcanizer. Adding carbon black can increase the strength, hardness and wear resistance of rubber. Carbon black can be effectively dispersed in rubber to form a network structure, improve mechanical strength and improve the tensile properties of rubber. Carbon black can also increase the weather resistance and anti-aging ability of rubber. In addition to having good antioxidant performance, adding antioxidant DM also has the functions of resisting ozone, resisting flex cracking and inhibiting harmful metals such as copper and manganese. Antioxidant RD is suitable for natural synthetic rubber, and has excellent protection against aging caused by heat and oxygen. Antioxidant ZDC has excellent protection against flexural fatigue caused by ozone, wind erosion and mechanical stress, and also has significant protection against oxygen, heat, high-energy radiation and copper damage. The addition of vulcanizing agent causes the double bonds or multiple bonds in the rubber molecules to produce cross-linking reactions under the action of the vulcanizing agent. The introduction of cross-linking bonds in the rubber chain forms a network structure between the rubber molecules, thereby increasing the mechanical and physical properties, elasticity and wear resistance of the rubber. DETAILED DESCRIPTION

[0029] Example 1

[0030] This embodiment provides an ultra-cold-resistant and low-temperature-resistant rubber cable material, and its formula is shown in Table 1.

[0031] Table 1 Formula of super cold-resistant and low-temperature-resistant rubber cable materials

[0032] name Unit(kg) name Unit(kg) Butadiene rubber 35 DOP 3 Natural rubber / Styrene butadiene rubber 5+5 Ethylene-butyl-hydroxyacrylate 0.5 Zinc Oxide 4 DM 0.3 Stearic acid 0.5 ZDC 0.4 Polyethylene wax 1.5 RD 0.3 Chlorinated paraffin oil 4 TMTD 0.8 Light calcium carbonate 30 Ultrafine talcum powder 6 Calcined clay 6 Antimony trioxide 3 N330 Carbon Black 4 N550 Carbon Black 4

[0033] Preparation method:

[0034] 1) Weigh all raw materials according to the formula in Table 1;

[0035] 2) Put the weighed natural rubber / styrene-butadiene rubber into an open mill for thin-pass plastication for 15-20 minutes, until the plasticized rubber is evenly distributed and the plasticity meets the requirements;

[0036] 3) Add butadiene rubber, polyethylene wax, chlorinated paraffin oil, dioctyl phthalate DOP, DM, RD, ZDC, cold-resistant toughening agent ethylene-acrylic acid n-butyl-hydroxy ester, stearic acid, antimony trioxide, zinc oxide, light calcium carbonate, ultrafine talc, calcined clay, N330, N550 carbon black to the internal mixer at high speed (speed 40R / min) for mixing for 5-8 minutes, control the temperature at 90-100°C, then add vulcanizing agent TMTD, control the temperature at 100-110°C, keep warm for 2-3 minutes, then control the temperature at 110-120°C, mix all the raw materials evenly and discharge the glue.

[0037] 4) Put the arranged rubber into the open mixing mill for automatic mixing 3-4 times, and spread the mixed rubber into rubber sheets through a sheet spreading machine. The size of the rubber is 100mm wide and 1.0mm thick.

[0038] The performance test data of the ultra-cold-resistant and low-temperature-resistant rubber cable material prepared in this embodiment are shown in Table 2.

[0039] Table 2 Performance test data of ultra-cold-resistant and low-temperature-resistant rubber cable material prepared in Example 1

[0040]

[0041] Example 2

[0042] This embodiment provides an ultra-cold-resistant and low-temperature-resistant rubber cable material, and its formula is shown in Table 3.

[0043] Table 3 Formula of super cold-resistant and low-temperature resistant rubber cable material

[0044] name Unit(kg) name Unit(kg) Butadiene rubber 35 DOP 3 Natural rubber / Styrene butadiene rubber 5+5 Ethylene-butyl-hydroxyacrylate 0.5 Zinc Oxide 4 DM 0.3 Stearic acid 0.5 ZDC 0.4 Polyethylene wax 1.5 RD 0.3 Chlorinated paraffin oil 4 TMTD 0.8 Light calcium carbonate 20 Ultrafine talcum powder 8 Calcined clay 6 Antimony trioxide 3 N330 Carbon Black 4 N550 Carbon Black 4

[0045] The preparation method is the same as Example 1.

[0046] Table 4 Performance test data of the ultra-cold-resistant and low-temperature-resistant rubber cable material prepared in Example 2

[0047]

[0048] Example 3

[0049] This embodiment provides an ultra-cold-resistant and low-temperature-resistant rubber cable material, and its formula is shown in Table 5.

[0050] Table 5 Formula of super cold-resistant and low-temperature-resistant rubber cable materials

[0051] name Unit(kg) name Unit(kg) Butadiene rubber 30 DOP 4 Natural rubber / Styrene butadiene rubber 7.5+7.5 Ethylene-butyl-hydroxyacrylate 0.5 Zinc Oxide 3 DM 0.3 Stearic acid 0.3 ZDC 0.4 Polyethylene wax 1.5 RD 0.3 Chlorinated paraffin oil 4 TMTD 0.8 Light calcium carbonate 25 Ultrafine talcum powder 6 Calcined clay 10 Antimony trioxide 3 N330 Carbon Black 4 N550 Carbon Black 4

[0052] The preparation method is the same as Example 1.

[0053] The performance test data of the ultra-cold-resistant and low-temperature-resistant rubber cable material prepared in this embodiment are shown in Table 6.

[0054] Table 6 Performance test data of ultra-cold-resistant and low-temperature-resistant rubber cable material obtained in Example 3

[0055]

Claims

1. An ultra-cold-resistant and low-temperature-resistant rubber cable material, characterized in that: The invention comprises the following raw materials in parts by weight: 20-35 parts of a first rubber base material, 8-15 parts of a second rubber base material, 2-4 parts of an accelerator, 0.3-0.5 parts of a stabilizer, 1.5-3 parts of a first plasticizer, 3-5 parts of a second plasticizer, 2-4 parts of a third plasticizer, 0.3-0.5 parts of a cold-resistant toughening agent, 0.3-1.0 parts of an antioxidant, 0.8-2 parts of a vulcanizing agent, 2-4 parts of a flame retardant, 25-42 parts of a filler and 3-8 parts of a reinforcing agent.

2. The ultra-cold-resistant and low-temperature-resistant rubber cable material according to claim 1, characterized in that: The first rubber base material is butadiene rubber; the second rubber base material is natural rubber / styrene-butadiene rubber, wherein the weight ratio of natural rubber to styrene-butadiene rubber is 1:

1.

3. The ultra-cold-resistant and low-temperature-resistant rubber cable material according to claim 1, characterized in that: The accelerator is zinc oxide; the stabilizer is stearic acid.

4. The ultra cold-resistant and low-temperature-resistant rubber cable material according to claim 1, characterized in that: The first plasticizer is polyethylene wax; the second plasticizer is chlorinated paraffin oil; the third plasticizer is dioctyl phthalate; the cold-resistant toughening agent is ethylene-butyl-hydroxy acrylate; and the flame retardant is antimony trioxide.

5. The ultra-cold-resistant and low-temperature-resistant rubber cable material according to claim 1, characterized in that: The antioxidant is at least one of dibenzothiazole disulfide, zinc diethyldithiocarbamate, and 2,2,4-trimethyl-1,2-dihydroquinoline polymer; and the vulcanizing agent is tetramethylthiuram disulfide.

6. The ultra-cold-resistant and low-temperature-resistant rubber cable material according to claim 1, characterized in that: The filler is at least one of light calcium carbonate, ultrafine talcum powder, and calcined clay; the reinforcing agent is at least one of white carbon black, N330 carbon black, and N550 carbon black.

7. A method for preparing the ultra-cold-resistant and low-temperature-resistant rubber cable material according to any one of claims 1 to 6, comprising the following steps: 1) Obtain each raw material and accurately weigh each raw material according to the formula ratio; 2) putting the weighed second rubber base material into an open mixing mill for thin-pass plastication; 3) Then add the first rubber base material, the first plasticizer, the second plasticizer, the third plasticizer, the antioxidant, the stabilizer, the flame retardant, the accelerator, the filler, and the reinforcing agent to the internal mixer for mixing, and then add the vulcanizing agent, mix well and discharge the glue; 4) The arranged rubber is put into the open mixing mill for automatic mixing, and the mixed rubber is spread into sheets.

8. The preparation method according to claim 7, characterized in that: In step 2), the mastication time is 15 to 20 minutes.

9. The preparation method according to claim 7, characterized in that: In step 3), the mixing time is 5 to 8 minutes at a temperature of 90 to 100° C. After adding the vulcanizing agent, the temperature is controlled at 100-110° C., kept warm for 2-3 minutes, and then controlled at 110-120° C. to mix evenly and discharge the glue.

10. The preparation method according to claim 7, characterized in that: In step 4), the mixing is performed 3-4 times.

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