CN111925611A - Heat-resistant high-strength cable sheath and preparation method thereof - Google Patents
Heat-resistant high-strength cable sheath and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/22—Oxides; Hydroxides of metals
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a heat-resistant high-strength cable sheath and a preparation method thereof. The feed is prepared from the following raw materials in parts by weight: 80-100 parts of polyvinyl chloride, 10-30 parts of vinylidene fluoride-hexafluoropropylene copolymer, 10-18 parts of heat-resistant agent, 3-6 parts of lubricant, 3-6 parts of vulcanizing agent and 1-3 parts of accelerator. The heat-resistant high-strength cable sheath prepared by the invention can still keep higher mechanical property at 75 ℃, and has high tensile strength and elongation at break. The mechanical properties of the material are enhanced by the composite use of the main materials of the polyvinyl chloride and the vinylidene fluoride-hexafluoropropylene copolymer, and the mechanical properties of the material at high temperature are also obviously enhanced by the added heat-resistant agent.
Description
Technical Field
The invention belongs to the technical field of preparation of wires and cables, and particularly relates to a heat-resistant high-strength cable sheath and a preparation method thereof.
Background
The cable sheath is the outermost layer of the cable and serves as an important barrier for protecting the safety of the internal structure in the cable, and the cable is protected from mechanical damage during installation and after installation. For special industries such as petrochemical industry, steel, aerospace, shipbuilding, military industry, pharmacy, food, plastic machinery, boilers and other industries related to heat and high temperature, wires and cables capable of resisting certain high temperature are needed, ordinary wires and cables cannot be used obviously, and the safe operation of electric power and signals of the wires and cables capable of resisting high temperature can be guaranteed.
Common plastic materials for cables comprise polyvinyl chloride, polyethylene (including crosslinked polyethylene), polypropylene and the like, and cable sheaths prepared from the materials have the advantages of high aging speed and remarkable reduction of mechanical properties after running at high temperature.
Disclosure of Invention
The invention aims to provide a heat-resistant high-strength cable sheath and a preparation method thereof.
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 80-100 parts of polyvinyl chloride, 10-30 parts of vinylidene fluoride-hexafluoropropylene copolymer, 10-18 parts of heat-resistant agent, 3-6 parts of lubricant, 3-6 parts of vulcanizing agent and 1-3 parts of accelerator.
The heat-resistant agent is aluminum silicate ceramic fiber.
The heat-resistant agent is composed of tridodecyl phosphite and sepiolite according to a mass ratio of 1: 1.
The heat-resistant agent is prepared by the following method: according to the weight portion, 20-30 portions of polyethyl methacrylate, 30-50 portions of polyethylene and 10-20 portions of acetylbenzyl peroxide are uniformly mixed, then the temperature is raised to 50-90 ℃, the temperature is kept for 30-40min, then 10-20 portions of silane coupling agent KH-560 and 3-8 portions of potassium persulfate are added and uniformly mixed, the mixture is stirred for 10-30min at the rotation speed of 700-900r/min, the pH value is adjusted to 3.5-5.0, then the mixture is raised to 65-75 ℃, the temperature is kept for 0.5-1.5h, the mixture is dried to constant weight at the temperature of 65-75 ℃ in vacuum after being washed, the mixture is cooled to the room temperature, then 3-8 portions of white carbon black, 3-8 portions of nano aluminum hydroxide, 2-5 portions of antimony trioxide and 3-6 portions of zinc phenylphosphonic acid are added and uniformly mixed, the mixture is stirred for 10-20min at the rotation speed, heating to 150 ℃ and 160 ℃, preserving the heat for 10-20min, and cooling to room temperature to obtain the heat-resistant agent.
The lubricant is one or more of calcium stearate, paraffin, PE wax and pentaerythritol stearate.
The vulcanizing agent is one or more of 2-mercapto-1, 3, 4-thiadiazole, N' -m-phenylene bismaleimide and a vulcanizing agent DCBP.
The accelerator is tetrabenzyl dithiothiuram and/or N-tertiary butyl-2-benzothiazole sulfonamide.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 80-100 parts of polyvinyl chloride, 10-30 parts of vinylidene fluoride-hexafluoropropylene copolymer and 10-20 parts of heat-resistant agent are mixed in an upper auxiliary machine of an internal mixer for 2-4min to obtain a first mixture; mixing 3-6 parts of lubricant, 3-6 parts of vulcanizing agent and 1-3 parts of accelerator in a lower auxiliary machine of an internal mixer for 2-4min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture;
(2) automatically discharging the third mixture onto an open mill, turning for 3-5 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 50-70 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 10-15h to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 70-90 ℃ for 2-4 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
The temperature in the internal mixer in the step (1) is controlled to be 90-120 ℃.
The invention has the beneficial effects that: the heat-resistant high-strength cable sheath prepared by the invention can still keep higher mechanical property at 65 ℃, and has high tensile strength and elongation at break. The mechanical properties of the composite material are synergistically enhanced by the composite use of the main materials of the polyvinyl chloride and the vinylidene fluoride-hexafluoropropylene copolymer. The heat-resistant agent added in the invention also obviously improves the mechanical property of the material at high temperature.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Example 1
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 90 parts of polyvinyl chloride, 20 parts of vinylidene fluoride-hexafluoropropylene copolymer, 15 parts of heat-resistant agent, 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyl thiuram dithionate; the heat-resistant agent is composed of tridodecyl phosphite and sepiolite according to a mass ratio of 1: 1.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 90 parts of polyvinyl chloride, 20 parts of vinylidene fluoride-hexafluoropropylene copolymer and 15 parts of heat-resistant agent are mixed in an upper auxiliary machine of an internal mixer for 3min to obtain a first mixture; mixing 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyldithiothiuram in a lower auxiliary machine of an internal mixer for 3min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture; controlling the temperature in the internal mixer to be 100 ℃;
(2) automatically discharging the third mixture onto an open mill, turning for 4 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 60 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 12 hours to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 80 ℃ for 3 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
Example 2
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 80 parts of polyvinyl chloride, 10 parts of vinylidene fluoride-hexafluoropropylene copolymer, 12 parts of aluminum silicate ceramic fiber, 3 parts of calcium stearate, 4 parts of N, N' -m-phenylene bismaleimide and 1 part of N-tert-butyl-2-benzothiazole sulfonamide.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 80 parts of polyvinyl chloride, 10 parts of vinylidene fluoride-hexafluoropropylene copolymer and 12 parts of aluminum silicate ceramic fiber are mixed in an upper auxiliary machine of an internal mixer for 2min to obtain a first mixture; mixing 3 parts of calcium stearate, 4 parts of N, N' -m-phenylene bismaleimide and 1 part of N-tert-butyl-2-benzothiazole sulfonamide in a lower auxiliary machine of an internal mixer for 2min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture; the temperature in the internal mixer is controlled at 90 ℃;
(2) automatically discharging the third mixture to an open mill, turning for 5 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 70 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 15h to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 90 ℃ for 4 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
Example 3
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 95 parts of polyvinyl chloride, 25 parts of vinylidene fluoride-hexafluoropropylene copolymer, 16 parts of heat-resistant agent, 5 parts of pentaerythritol stearate, 6 parts of vulcanizing agent DCBP and 3 parts of tetrabenzyl thiuram dithionate.
The heat-resistant agent is prepared by the following method: according to the weight parts, 30 parts of polyethylmethacrylate, 50 parts of polyethylene and 20 parts of acetylbenzyl peroxide are uniformly mixed, then the temperature is raised to 80 ℃, the temperature is kept for 35min, then 15 parts of silane coupling agent KH-560 and 8 parts of potassium persulfate are added and uniformly mixed, the mixture is stirred for 15min at the rotation speed of 900r/min, the pH value is adjusted to 5.0, then the temperature is raised to 75 ℃, the temperature is kept for 1.5h, the mixture is dried to constant weight at 75 ℃ in vacuum after being washed, the mixture is cooled to room temperature, then 8 parts of white carbon black, 8 parts of nano aluminum hydroxide, 5 parts of antimony trioxide and 6 parts of zinc phenylphosphonic acid are added and uniformly mixed, the mixture is stirred for 20min at the rotation speed of 120r/min, the temperature is raised to 160 ℃, the temperature is kept.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 95 parts of polyvinyl chloride, 25 parts of vinylidene fluoride-hexafluoropropylene copolymer and 16 parts of heat-resistant agent are mixed in an upper auxiliary machine of an internal mixer for 3min to obtain a first mixture; mixing 5 parts of pentaerythritol stearate, 6 parts of vulcanizing agent DCBP and 3 parts of tetrabenzyl thiuram dithionate in a lower auxiliary machine of an internal mixer for 3min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture; controlling the temperature in the internal mixer at 110 ℃;
(2) automatically discharging the third mixture onto an open mill, turning for 4 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 70 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 15h to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 90 ℃ for 3 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
Comparative example 1
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 90 parts of polyvinyl chloride, 20 parts of vinylidene fluoride-hexafluoropropylene copolymer, 15 parts of tridodecyl phosphite, 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyl thiuram dithionate.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 90 parts of polyvinyl chloride, 20 parts of vinylidene fluoride-hexafluoropropylene copolymer and 15 parts of tridodecyl phosphite are mixed in an upper auxiliary machine of an internal mixer for 3min to obtain a first mixture; mixing 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyldithiothiuram in a lower auxiliary machine of an internal mixer for 3min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture; controlling the temperature in the internal mixer to be 100 ℃;
(2) automatically discharging the third mixture onto an open mill, turning for 4 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 60 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 12 hours to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 80 ℃ for 3 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
Comparative example 2
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 90 parts of polyvinyl chloride, 20 parts of vinylidene fluoride-hexafluoropropylene copolymer, 15 parts of sepiolite, 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyl thiuram dithionate.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 90 parts of polyvinyl chloride, 20 parts of vinylidene fluoride-hexafluoropropylene copolymer and 15 parts of sepiolite are mixed in an upper auxiliary machine of an internal mixer for 3min to obtain a first mixture; mixing 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyldithiothiuram in a lower auxiliary machine of an internal mixer for 3min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture; controlling the temperature in the internal mixer to be 100 ℃;
(2) automatically discharging the third mixture onto an open mill, turning for 4 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 60 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 12 hours to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 80 ℃ for 3 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
Comparative example 3
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 95 parts of polyvinyl chloride, 25 parts of vinylidene fluoride-hexafluoropropylene copolymer, 5 parts of pentaerythritol stearate, 6 parts of vulcanizing agent DCBP and 3 parts of tetrabenzyl thiuram dithionate.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 95 parts of polyvinyl chloride and 25 parts of vinylidene fluoride-hexafluoropropylene copolymer are mixed in an upper auxiliary machine of an internal mixer for 3min to obtain a first mixture; mixing 5 parts of pentaerythritol stearate, 6 parts of vulcanizing agent DCBP and 3 parts of tetrabenzyl thiuram dithionate in a lower auxiliary machine of an internal mixer for 3min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture; controlling the temperature in the internal mixer at 110 ℃;
(2) automatically discharging the third mixture onto an open mill, turning for 4 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 70 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 15h to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 90 ℃ for 3 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
Comparative example 4
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 110 parts of polyvinyl chloride, 15 parts of heat-resistant agent, 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyl thiuram dithiocarbonate; the heat-resistant agent is composed of tridodecyl phosphite and sepiolite according to a mass ratio of 1: 1.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 110 parts of polyvinyl chloride and 15 parts of heat-resistant agent are mixed in an upper auxiliary machine of an internal mixer for 3min to obtain a first mixture; mixing 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyldithiothiuram in a lower auxiliary machine of an internal mixer for 3min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture; controlling the temperature in the internal mixer to be 100 ℃;
(2) automatically discharging the third mixture onto an open mill, turning for 4 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 60 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 12 hours to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 80 ℃ for 3 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
Comparative example 5
A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 110 parts of vinylidene fluoride-hexafluoropropylene copolymer, 15 parts of heat-resistant agent, 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyl thiuram dithionate; the heat-resistant agent is composed of tridodecyl phosphite and sepiolite according to a mass ratio of 1: 1.
The preparation method of the heat-resistant high-strength cable sheath comprises the following steps:
(1) according to the weight parts, 110 parts of vinylidene fluoride-hexafluoropropylene copolymer and 15 parts of heat-resistant agent are mixed in an upper auxiliary machine of an internal mixer for 3min to obtain a first mixture; mixing 5 parts of paraffin, 5 parts of 2-mercapto-1, 3, 4-thiadiazole and 2 parts of tetrabenzyldithiothiuram in a lower auxiliary machine of an internal mixer for 3min to obtain a second mixture; mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture; controlling the temperature in the internal mixer to be 100 ℃;
(2) automatically discharging the third mixture onto an open mill, turning for 4 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 60 ℃; rolling the first rubber material on a rolling machine to obtain a sheet;
(3) placing the first rubber material after rolling at room temperature for 12 hours to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 80 ℃ for 3 min;
(4) and (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
Experimental example:
the cable materials of examples 1-3 and comparative examples 1-4 were placed at 55 ℃ and 75 ℃ for 120 hours, and then cooled to 25 ℃ to measure the tensile strength and elongation at break according to GB/T1040-1992, the results are shown in tables 1-2:
TABLE 1 tensile Strength test (in MPa)
Note: represents P <0.05 compared to example 1.
TABLE 2 elongation at break (% units)
Note: represents P <0.05 compared to example 1.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A heat-resistant high-strength cable sheath is characterized by being prepared from the following raw materials in parts by weight: 80-100 parts of polyvinyl chloride, 10-30 parts of vinylidene fluoride-hexafluoropropylene copolymer, 10-18 parts of heat-resistant agent, 3-6 parts of lubricant, 3-6 parts of vulcanizing agent and 1-3 parts of accelerator.
2. The heat resistant high strength cable jacket according to claim 1, wherein the heat resistant agent is an alumina silicate ceramic fiber.
3. The heat-resistant high-strength cable sheath according to claim 1, wherein the heat-resistant agent is tridodecyl phosphite and sepiolite in a mass ratio of 1: 1.
4. The heat-resistant high-strength cable sheath according to claim 1, wherein the heat-resistant agent is a substance prepared by a method comprising: according to the weight portion, 20-30 portions of polyethyl methacrylate, 30-50 portions of polyethylene and 10-20 portions of acetylbenzyl peroxide are uniformly mixed, then the temperature is raised to 50-90 ℃, the temperature is kept for 30-40min, then 10-20 portions of silane coupling agent KH-560 and 3-8 portions of potassium persulfate are added and uniformly mixed, the mixture is stirred for 10-30min at the rotation speed of 700-900r/min, the pH value is adjusted to 3.5-5.0, then the mixture is raised to 65-75 ℃, the temperature is kept for 0.5-1.5h, the mixture is dried to constant weight at the temperature of 65-75 ℃ in vacuum after being washed, the mixture is cooled to the room temperature, then 3-8 portions of white carbon black, 3-8 portions of nano aluminum hydroxide, 2-5 portions of antimony trioxide and 3-6 portions of zinc phenylphosphonic acid are added and uniformly mixed, the mixture is stirred for 10-20min at the rotation speed, heating to 150 ℃ and 160 ℃, preserving the heat for 10-20min, and cooling to room temperature to obtain the heat-resistant agent.
5. The heat-resistant high-strength cable sheath according to claim 1, wherein the lubricant is one or more of calcium stearate, paraffin wax, PE wax and pentaerythritol stearate.
6. The heat-resistant high-strength cable sheath according to claim 1, wherein the vulcanizing agent is one or more of 2-mercapto-1, 3, 4-thiadiazole, N' -m-phenylene bismaleimide and a vulcanizing agent DCBP.
7. The heat resistant, high strength cable jacket according to claim 1, wherein said accelerator is tetrabenzyldithiothiuram and/or N-tert-butyl-2-benzothiazolesulfenamide.
8. The method for preparing a heat-resistant high-strength cable sheath as claimed in claim 1, which is carried out according to the following steps:
(1) according to the weight parts, 80-100 parts of polyvinyl chloride, 10-30 parts of vinylidene fluoride-hexafluoropropylene copolymer and 10-20 parts of heat-resistant agent are mixed in an upper auxiliary machine of an internal mixer for 2-4min to obtain a first mixture; mixing 3-6 parts of lubricant, 3-6 parts of vulcanizing agent and 1-3 parts of accelerator in a lower auxiliary machine of an internal mixer for 2-4min to obtain a second mixture; and mixing the first mixture and the second mixture in an internal mixer to obtain a third mixture.
(2) Automatically discharging the third mixture onto an open mill, turning for 3-5 times to obtain a first rubber material, and controlling the temperature of a roller of the open mill to be 50-70 ℃; and (3) rolling the first rubber material on a rolling machine to obtain a sheet.
(3) And (3) placing the first rubber material after rolling at room temperature for 10-15h to obtain a second rubber material, and placing the second rubber material in the internal mixer for mixing at 70-90 ℃ for 2-4 min.
(4) And (3) repeating the operation step (2) on the third sizing material, turning and rolling to obtain a sheet, and finally obtaining the heat-resistant high-strength cable sheath.
9. The method for preparing a heat-resistant high-strength cable sheath according to claim 8, wherein the temperature in the internal mixer of the step (1) is controlled to 90-120 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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