CN113754966A - Preparation method of soft 70 ℃ PVC insulating material - Google Patents
Preparation method of soft 70 ℃ PVC insulating material Download PDFInfo
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- CN113754966A CN113754966A CN202110984846.3A CN202110984846A CN113754966A CN 113754966 A CN113754966 A CN 113754966A CN 202110984846 A CN202110984846 A CN 202110984846A CN 113754966 A CN113754966 A CN 113754966A
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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
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention provides a preparation method of a soft 70 ℃ PVC insulating material, which comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 5-6 parts of composite stabilizer, 1-1.2 parts of processing aid, 60-66 parts of plasticizer, 30-34 parts of composite filler, 2% of composite modifier and 0-1 part of other additives. The product prepared by the invention has good flexibility and insulativity.
Description
Technical Field
The invention relates to the technical field of material forming and processing, in particular to a preparation method of a soft 70 ℃ PVC insulating material.
Background
In the national standard GB8815, the requirements on aging and the like of a PVC insulating material at 70 ℃ are the same as those of a sheath material, but the required insulating property is higher, the volume resistivity needs to be detected at the working temperature of 70 ℃, the volume resistivity of plastics rapidly decreases along with the temperature rise, and the volume resistivity is detected at the temperature of 70 ℃, so that the requirements are difficult to meet.
Among factors influencing the volume resistivity of the plastic, the plasticizer is a material which has the greatest influence on the volume resistivity of the plastic, the fluidity of the PVC wire and cable material is enhanced along with the reduction of the hardness of the PVC wire and cable material, but the volume resistivity is reduced, and how to ensure the softness of the PVC wire and cable insulating material becomes the key of the invention on the premise of ensuring that the volume resistivity of the PVC wire and cable insulating material meets the standard.
Disclosure of Invention
The invention provides a preparation method of a soft 70 ℃ PVC insulating material, and the prepared product has good flexibility and insulating property.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a preparation method of a soft 70 ℃ PVC insulating material is characterized by comprising the following steps: the flexible 70 ℃ PVC insulating material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 5-6 parts of composite stabilizer, 1-1.2 parts of processing aid, 60-66 parts of plasticizer, 30-34 parts of composite filler, 2% of composite modifier and 0-1 part of other additives; the preparation method comprises the following steps:
s1: weighing polyvinyl chloride resin, a composite stabilizer, a processing aid, a plasticizer, a composite filler, a composite modifier and other aids according to the formula ratio, fully mixing the substances in the composite filler by using a high-speed mixer, slowly adding the composite modifier, and stirring after completely mixing;
s2: adding half of polyvinyl chloride resin by weight into a high-speed mixer, adding a composite stabilizer, a processing aid and other additives, adding the other half of polyvinyl chloride resin by weight, starting low-speed stirring, stirring for half a minute, uniformly adding half of plasticizer by weight, starting high-speed stirring, gradually heating, stirring to 60 ℃, uniformly adding the other half of plasticizer by weight, stirring continuously while adding the plasticizer, and stirring to 120-130 ℃, wherein the plasticizer adding time is not more than 4 minutes;
s3: extruding the raw material obtained in S2 through a single-screw extruder with the length-diameter ratio of more than 28 and the screw diameter of more than 90mm, wherein the extrusion temperature is 130-.
Preferably, the polyvinyl chloride resin is a polyvinyl chloride resin produced by a vinyl method and having a polymerization degree of 1300.
Preferably, the composite stabilizer is a mixture of zinc stearate, magnesium stearate, a light stabilizer and talc powder, and the weight ratio of the zinc stearate and the magnesium stearate in the composite stabilizer is not less than 80%.
As a preferable technical scheme, the plasticizer is a mixture of dioctyl phthalate and dioctyl terephthalate, and the mass ratio of dioctyl phthalate to dioctyl terephthalate is 1: 1.
according to a preferable technical scheme, the composite filler is a mixture of nano-level argil and ground calcium carbonate, and the mass ratio of the nano-level argil to the calcium carbonate is 5: 1, the fineness of the heavy calcium carbonate is more than 2500 meshes.
According to the preferable technical scheme, the processing aid is a mixture of polyethylene wax and stearic acid, the mass ratio of the polyethylene wax to the stearic acid is 1 (1-2), and the polymerization degree of the polyethylene wax is greater than 2000.
According to a preferable technical scheme, the composite modifier is a mixture of a silane coupling agent and polyethylene wax, and the mass ratio of the silane coupling agent to the polyethylene wax is 1: 1.
Compared with the prior art, the invention has the beneficial effects that:
the softness of the composite filler and the modified composite filler is changed, and the preparation process is optimized by optimizing the proportion, for example, the surface of the composite filler is modified in the preparation method, so that the finally prepared insulating material has good insulating property.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein.
A preparation method of a soft 70 ℃ PVC insulation material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 5-6 parts of composite stabilizer, 1-1.2 parts of processing aid, 60-66 parts of plasticizer, 30-34 parts of composite filler, 2% of composite modifier and 0-1 part of other additives; the preparation method comprises the following steps:
s1: weighing polyvinyl chloride resin, a composite stabilizer, a processing aid, a plasticizer, a composite filler, a composite modifier and other aids according to the formula ratio, fully mixing the substances in the composite filler by using a high-speed mixer, slowly adding the composite modifier, and stirring after completely mixing;
s2: adding half of polyvinyl chloride resin by weight into a high-speed mixer, adding a composite stabilizer, a processing aid and other additives, adding the other half of polyvinyl chloride resin by weight, starting low-speed stirring, stirring for half a minute, uniformly adding half of plasticizer by weight, starting high-speed stirring, gradually heating, stirring to 60 ℃, uniformly adding the other half of plasticizer by weight, stirring continuously while adding the plasticizer, and stirring to 120-130 ℃, wherein the plasticizer adding time is not more than 4 minutes;
s3: extruding the raw material obtained in S2 through a single-screw extruder with the length-diameter ratio of more than 28 and the screw diameter of more than 90mm, wherein the extrusion temperature is 130-.
In one embodiment, the polyvinyl chloride resin is a polyvinyl chloride resin having a polymerization degree of 1300 by a vinyl method, and specifically, a Taiwan plastic S70 or an ocean TH-1300 is used.
In one embodiment, the composite stabilizer is a mixture of zinc stearate, magnesium stearate, a light stabilizer and talc powder, the weight ratio of the zinc stearate and the magnesium stearate to the composite stabilizer is not less than 80%, and the zinc stearate and the magnesium stearate can improve the softness of the insulating material.
In one embodiment, the plasticizer is a mixture of dioctyl phthalate and dioctyl terephthalate, and the mass ratio of dioctyl phthalate to dioctyl terephthalate is 1:1, the plasticizer has great influence on the softness of the insulating material, and dioctyl phthalate and dioctyl terephthalate are adopted, so that the insulating material has good plasticity, and the plasticizer belongs to the plasticizer with low volume resistivity.
In one embodiment, the composite filler is a mixture of nano-clay and ground calcium carbonate, and the mass ratio of the nano-clay to the calcium carbonate is 5: the fineness of the heavy calcium carbonate is more than 2500 meshes, the smaller the particle size of the composite filler is, the more uniform the filling is, the volume resistivity can be improved to a certain degree, and the heavy calcium carbonate has good deflection resistance.
In one embodiment, the processing aid is a mixture of polyethylene wax and stearic acid, the mass ratio of the polyethylene wax to the stearic acid is 1 (1-2), the polymerization degree of the polyethylene wax is greater than 2000, and the polyethylene wax and the stearic acid can also improve the insulation property of the insulating material to a certain extent.
In one embodiment, the composite modifier is a mixture of a silane coupling agent and polyethylene wax, and the mass ratio of the silane coupling agent to the polyethylene wax is 1: 1.
In one embodiment, other additives may be added according to different requirements, such as anti-wear agents, color powders, lubricants and the like.
In the above ratio, when there is a mixture in which a plurality of substances are mixed, when parts by weight of the mixture are distributed into the mixture by a ratio such that parts by weight of the individual substances are infinite, a method of rounding off to reserve one decimal is adopted.
Example 1
Embodiment 1 provides a preparation method of a soft 70 ℃ PVC insulating material, wherein the soft 70 ℃ PVC insulating material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 5 parts of composite stabilizer, 1 part of processing aid, 60 parts of plasticizer, 30 parts of composite filler, 0.6 part of composite modifier and 0.1 part of toner; the preparation method comprises the following steps:
s1: weighing polyvinyl chloride resin, a composite stabilizer, a processing aid, a plasticizer, a composite filler, a composite modifier and other aids according to the formula ratio, fully mixing the substances in the composite filler by using a high-speed mixer, slowly adding the composite modifier, and stirring after completely mixing;
s2: adding half of polyvinyl chloride resin by weight into a high-speed mixer, adding a composite stabilizer, a processing aid and other additives, adding the other half of polyvinyl chloride resin by weight, starting low-speed stirring, stirring for half a minute, uniformly adding half of plasticizer by weight, starting high-speed stirring, gradually heating, stirring to 60 ℃, uniformly adding the other half of plasticizer by weight, stirring continuously while adding the plasticizer, stirring to 120 ℃, and finishing the plasticizer adding for 4 minutes;
s3: extruding the raw material obtained in the step S2 through a single-screw extruder with the length-diameter ratio of 30 and the screw diameter of more than 120mm, wherein the extrusion temperature is 130 ℃, producing by adopting a water cooling method, pelletizing, then air cooling, drying and packaging.
The polyvinyl chloride resin adopts a bench plastic S70.
The composite stabilizer is a mixture of zinc stearate, magnesium stearate, a light stabilizer and talcum powder, wherein the zinc stearate is 2.1 parts, the magnesium stearate is 2.1 parts, the light stabilizer is 0.4 part and the talcum powder is 0.4 part.
The plasticizer is a mixture of dioctyl phthalate and dioctyl terephthalate, and the plasticizer comprises 30 parts of dioctyl phthalate and 30 parts of dioctyl terephthalate.
The composite filler is a mixture of nano argil and heavy calcium carbonate, wherein the nano argil accounts for 25 parts, the heavy calcium carbonate accounts for 5 parts, and the fineness of the heavy calcium carbonate is 2600 meshes.
The processing aid is a mixture of polyethylene wax and stearic acid, and the polymerization degree of the polyethylene wax is 2100, the polyethylene wax is 0.5 part, and the stearic acid is 0.5 part.
The composite modifier is a mixture of a silane coupling agent and polyethylene wax, wherein the silane coupling agent accounts for 0.3 part, and the polyethylene wax accounts for 0.3 part.
Example 2
Embodiment 2 provides a preparation method of a soft 70 ℃ PVC insulating material, wherein the soft 70 ℃ PVC insulating material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 5 parts of composite stabilizer, 1 part of processing aid, 64 parts of plasticizer, 33 parts of composite filler, 0.66 part of composite modifier and 0.5 part of toner; the preparation method comprises the following steps:
s1: weighing polyvinyl chloride resin, a composite stabilizer, a processing aid, a plasticizer, a composite filler, a composite modifier and other aids according to the formula ratio, fully mixing the substances in the composite filler by using a high-speed mixer, slowly adding the composite modifier, and stirring after completely mixing;
s2: adding half of polyvinyl chloride resin by weight into a high-speed mixer, adding a composite stabilizer, a processing aid and other additives, adding the other half of polyvinyl chloride resin by weight, starting low-speed stirring, stirring for half a minute, uniformly adding half of plasticizer by weight, starting high-speed stirring, gradually heating, stirring to 60 ℃, uniformly adding the other half of plasticizer by weight, stirring continuously while adding the plasticizer, stirring to 120-130 ℃, and finishing the plasticizer adding for 3 minutes;
s3: extruding the raw material obtained in the step S2 by a single screw extruder with the length-diameter ratio of 30 and the screw diameter of 120mm, wherein the extrusion temperature is 140 ℃, performing water cooling production, pelletizing, then performing air cooling, drying and packaging.
The polyvinyl chloride resin adopts ocean TH-1300.
The composite stabilizer is a mixture of zinc stearate, magnesium stearate, a light stabilizer and talcum powder, wherein the zinc stearate is 2.3 parts, the magnesium stearate is 2.3 parts, the light stabilizer is 0.2 part and the talcum powder is 0.2 part.
The plasticizer is a mixture of dioctyl phthalate and dioctyl terephthalate, and 32 parts of dioctyl phthalate and 32 parts of dioctyl terephthalate are used.
The composite filler is a mixture of nano argil and heavy calcium carbonate, the nano argil accounts for 27.5 parts, the heavy calcium carbonate accounts for 5.5 parts, and the fineness of the heavy calcium carbonate is 2600 meshes.
The processing aid is a mixture of polyethylene wax and stearic acid, and the polymerization degree of the polyethylene wax is 2100, the polyethylene wax is 0.5 part, and the stearic acid is 0.5 part.
The composite modifier is a mixture of a silane coupling agent and polyethylene wax, wherein the silane coupling agent accounts for 0.33 part, and the polyethylene wax accounts for 0.33 part.
Example 3
Embodiment 3 provides a preparation method of a soft 70 ℃ PVC insulating material, wherein the soft 70 ℃ PVC insulating material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 6 parts of composite stabilizer, 1.2 parts of processing aid, 66 parts of plasticizer, 34 parts of composite filler, 0.68 part of composite modifier and 1 part of toner; the preparation method comprises the following steps:
s1: weighing polyvinyl chloride resin, a composite stabilizer, a processing aid, a plasticizer, a composite filler, a composite modifier and other aids according to the formula ratio, fully mixing the substances in the composite filler by using a high-speed mixer, slowly adding the composite modifier, and stirring after completely mixing;
s2: adding half of polyvinyl chloride resin by weight into a high-speed mixer, adding a composite stabilizer, a processing aid and other additives, adding the other half of polyvinyl chloride resin by weight, starting low-speed stirring, stirring for half a minute, uniformly adding half of plasticizer by weight, starting high-speed stirring, gradually heating, stirring to 60 ℃, uniformly adding the other half of plasticizer by weight, stirring continuously while adding the plasticizer, stirring to 130 ℃, and finishing the plasticizer adding for 3 minutes;
s3: extruding the raw material obtained in the step S2 by a single screw extruder with the length-diameter ratio of 30 and the screw diameter of 120mm, wherein the extrusion temperature is 170 ℃, producing by adopting a water cooling method, pelletizing, then air cooling, drying and packaging.
The polyvinyl chloride resin adopts ocean TH-1300.
The composite stabilizer is a mixture of zinc stearate, magnesium stearate, a light stabilizer and talcum powder, wherein the zinc stearate is 2.7 parts, the magnesium stearate is 2.7 parts, the light stabilizer is 0.3 part and the talcum powder is 0.3 part.
The plasticizer is a mixture of dioctyl phthalate and dioctyl terephthalate, and the plasticizer comprises 33 parts of dioctyl phthalate and 33 parts of dioctyl terephthalate.
The composite filler is a mixture of nano argil and heavy calcium carbonate, wherein 28.3 parts of the nano argil and 5.7 parts of the heavy calcium carbonate have a fineness of 2600 meshes.
The processing aid is a mixture of polyethylene wax and stearic acid, and the polymerization degree of the polyethylene wax is 2100, the polyethylene wax is 0.6 part, and the stearic acid is 0.6 part.
The composite modifier is a mixture of a silane coupling agent and polyethylene wax, wherein the silane coupling agent accounts for 0.34 part, and the polyethylene wax accounts for 0.34 part.
And (3) performance testing:
1) and (3) volume resistivity test: the thickness of the sample is (1.0 mm 0.1) mm, the volume resistivity is measured at 20 ℃, the sample is soaked in distilled water at the temperature of (20 +/-2) ℃ for 24 hours, and the wiping is carried out immediately; and (3) measuring the volume resistivity at the working temperature, keeping the temperature of the sample constant in an oven at the test temperature for 1h, immediately testing other samples according to the GB/T1410-2006 specification, wherein the test voltage is 1000V, and the test results are shown in Table 1.
2) Other performance tests are carried out according to the method required by GB 8815-2008; the test results are shown in Table 1.
TABLE 1 Performance test
The foregoing examples are given for the purpose of illustrating the invention in a clear and non-limiting manner, and it will be apparent to those skilled in the art that variations and modifications of other forms may be made on the basis of the foregoing description, which are not intended to be exhaustive or to limit the invention to the precise form disclosed, and all such variations and modifications are within the scope of the invention.
Claims (7)
1. A preparation method of a soft 70 ℃ PVC insulating material is characterized by comprising the following steps: the soft 70 ℃ PVC insulating material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 5-6 parts of composite stabilizer, 1-1.2 parts of processing aid, 60-66 parts of plasticizer, 30-34 parts of composite filler, 2% of composite modifier and 0-1 part of other additives; the preparation method comprises the following steps:
s1: weighing polyvinyl chloride resin, a composite stabilizer, a processing aid, a plasticizer, a composite filler, a composite modifier and other aids according to the formula ratio, fully mixing the substances in the composite filler by using a high-speed mixer, slowly adding the composite modifier, and stirring after completely mixing;
s2: adding half of polyvinyl chloride resin by weight into a high-speed mixer, adding a composite stabilizer, a processing aid and other additives, adding the other half of polyvinyl chloride resin by weight, starting low-speed stirring, stirring for half a minute, uniformly adding half of plasticizer by weight, starting high-speed stirring, gradually heating, stirring to 60 ℃, uniformly adding the other half of plasticizer by weight, stirring continuously while adding the plasticizer, stirring to 120-130 ℃, and finishing, wherein the adding time of the plasticizer is not more than 4 minutes;
s3: extruding the raw material obtained in S2 through a single-screw extruder with the length-diameter ratio of more than 28 and the screw diameter of more than 90mm, wherein the extrusion temperature is 130-.
2. The method for preparing the flexible 70 ℃ PVC insulation material according to claim 1 is characterized in that: the polyvinyl chloride resin is vinyl method polyvinyl chloride resin with the polymerization degree of 1300.
3. The method for preparing the flexible 70 ℃ PVC insulation material according to claim 1 is characterized in that: the composite stabilizer is a mixture of zinc stearate, magnesium stearate, a light stabilizer and talcum powder, and the weight ratio of the zinc stearate to the magnesium stearate in the composite stabilizer is not less than 80%.
4. The method for preparing the flexible 70 ℃ PVC insulation material according to claim 1 is characterized in that: the plasticizer is a mixture of dioctyl phthalate and dioctyl terephthalate, and the mass ratio of the dioctyl phthalate to the dioctyl terephthalate is 1: 1.
5. the method for preparing the flexible 70 ℃ PVC insulation material according to claim 1 is characterized in that: the composite filler is a mixture of nano argil and ground calcium carbonate, and the mass ratio of the nano argil to the calcium carbonate is 5: 1, the fineness of the heavy calcium carbonate is more than 2500 meshes.
6. The method for preparing the flexible 70 ℃ PVC insulation material according to claim 1 is characterized in that: the processing aid is a mixture of polyethylene wax and stearic acid, the mass ratio of the polyethylene wax to the stearic acid is 1 (1-2), and the polymerization degree of the polyethylene wax is greater than 2000.
7. The method for preparing the flexible 70 ℃ PVC insulation material according to claim 1 is characterized in that: the composite modifier is a mixture of a silane coupling agent and polyethylene wax, and the mass ratio of the silane coupling agent to the polyethylene wax is 1: 1.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417672A (en) * | 2010-09-27 | 2012-04-18 | 刘敏 | Environment-friendly high speed extruded polyvinyl chloride insulation material and preparation method |
| CN102585396A (en) * | 2011-12-28 | 2012-07-18 | 上海特缆电工科技有限公司 | Water-resistant polyvinyl chloride (PVC) cable insulating material |
| CN103865199A (en) * | 2014-03-17 | 2014-06-18 | 苏州亨利通信材料有限公司 | Cold-resistant high-insulation polyvinyl chloride cable material and preparation method thereof |
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2021
- 2021-08-24 CN CN202110984846.3A patent/CN113754966A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417672A (en) * | 2010-09-27 | 2012-04-18 | 刘敏 | Environment-friendly high speed extruded polyvinyl chloride insulation material and preparation method |
| CN102585396A (en) * | 2011-12-28 | 2012-07-18 | 上海特缆电工科技有限公司 | Water-resistant polyvinyl chloride (PVC) cable insulating material |
| CN103865199A (en) * | 2014-03-17 | 2014-06-18 | 苏州亨利通信材料有限公司 | Cold-resistant high-insulation polyvinyl chloride cable material and preparation method thereof |
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