PVC cable material and preparation method thereof

Abstract

The invention relates to the technical field of power cables, in particular to a PVC cable material and a preparation method thereof. The PVC cable material comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 28-35 parts of silica powder, 50 parts of a plasticizer, 6 parts of a stabilizer and 0.5-3 parts of an auxiliary agent. According to the PVC cable material, the silica powder is adopted as the filler, compared with calcium powder, the silica powder has the advantages of being resistant to acid and alkali corrosion, good in insulativity, good in chemical stability, good in fire resistance and the like, the volume resistivity of the cable material is increased by one order of magnitude, and the insulating performance is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, and in particular to a PVC cable material and a preparation method thereof. Background Art

[0002] In today's society, with the continuous improvement of environmental awareness and the pursuit of sustainable energy, electric vehicles are developing rapidly as a green travel mode. The widespread use of electric vehicles is inseparable from reliable charging facilities, and the charging cable is a key component connecting electric vehicles and charging equipment, and its performance, especially the insulation performance, is crucial.

[0003] Traditional fuel vehicles are mainly powered by fuel, while electric vehicles are powered by electricity. This change makes charging cables bear the important task of transmitting high voltage and high current. In order to ensure the safety and reliability of the charging process, the insulation performance of the charging cable must meet strict requirements.

[0004] At present, the electric vehicle charging cables on the market are mainly made of insulating materials such as rubber and plastic. These materials can meet the insulation requirements of charging cables to a certain extent, but there are also some shortcomings. For example, the heat resistance and cold resistance of some insulating materials are not ideal, and performance may deteriorate in high or low temperature environments. In addition, with the continuous increase in charging power, higher requirements are also placed on the voltage resistance of insulating materials. Summary of the invention

[0005] The object of the present invention is to provide a PVC cable material which uses silicon powder as a raw material to improve the insulation of cable granules and a preparation method thereof.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a PVC cable material, comprising the following components in parts by weight:

[0007] 100 parts of polyvinyl chloride, 28-35 parts of silicon powder, 50 parts of plasticizer, 6 parts of stabilizer, and 0.5-3 parts of additives.

[0008] Further, the composition comprises the following components in parts by weight:

[0009] 100 parts of polyvinyl chloride, 30 parts of silicon powder, 50 parts of plasticizer, 6 parts of stabilizer, and 2 parts of additives.

[0010] Furthermore, the silicon micropowder is obtained by screening and grinding kaolin ore.

[0011] Furthermore, the particle size of the silicon micropowder is 1100-1350 meshes.

[0012] Furthermore, the plasticizer is one or more of dioctyl terephthalate, dioctyl phthalate, and soybean oil.

[0013] Furthermore, the stabilizer is a calcium zinc stabilizer.

[0014] Furthermore, the auxiliary agent is one of tricresyl phosphate, stearic acid or polyethylene wax.

[0015] The above-mentioned method for preparing a PVC cable material is characterized in that it specifically comprises the following steps:

[0016] S1. Weigh polyvinyl chloride, plasticizer, silicon powder, stabilizer and additives in order by weight and set aside; wherein, polyvinyl chloride is 100 parts, silicon powder is 28-35 parts, plasticizer is 50 parts, stabilizer is 6 parts, and additive is 0.5-3 parts;

[0017] S2, after mixing polyvinyl chloride, plasticizer and additives, crushing them, mixing them to 110-130° C., adding silicon powder and stabilizer, and continuing to mix them to 140-160° C. to obtain a mixture;

[0018] S3. The mixed material is put into a twin-screw extruder, melt-mixed, extruded and granulated at an extrusion temperature of 150-180° C. to obtain a PVC cable material.

[0019] Furthermore, the preparation method of the silicon micropowder is:

[0020] The kaolin ore is sequentially processed through water washing, pulping, sieving, magnetic separation, pickling, flotation and cleaning to obtain quartz sand with a particle size of less than 0.1 mm. The quartz sand is ground and graded by a sand mill to prepare silicon micropowder with a particle size of 1100 to 1350 mesh. The intensity of the magnetic separation is 0.6-0.8T, the acid solution for pickling is a mixture of oxalic acid, citric acid and hydrogen peroxide, the solid-liquid ratio of the acid solution to the quartz sand is 1:1, and the collector for flotation is dodecylamine, and the dosage is 40g / t-80g / t of ore pulp.

[0021] The above-mentioned PVC cable material is used in the field of electric vehicles.

[0022] The beneficial effects brought by the technical solution provided by the present invention are:

[0023] (1) The PVC cable material of the present invention uses silicon micropowder as raw material. Compared with calcium powder, silicon micropowder has the advantages of acid and alkali corrosion resistance, good insulation, good chemical stability and good fire resistance, which increases the volume resistivity of the cable material by an order of magnitude and greatly improves the insulation performance.

[0024] (2) The raw material cost of the PVC cable material of the present invention is low, which is beneficial to reducing the production cost of the PVC cable material and improving the economic performance of the PVC cable material; the stabilizer and the plasticizer improve the aging resistance of the PVC cable material while improving its thermal stability, thereby extending the service life of the power cable. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0026] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified.

[0027] The present invention provides a method for preparing a PVC cable material, which specifically comprises the following steps:

[0028] S1. Weigh polyvinyl chloride, plasticizer, silicon powder, stabilizer and additives in order by weight and set aside; among them, 100 parts of polyvinyl chloride, 28-35 parts of silicon powder, 50 parts of plasticizer, 6 parts of stabilizer, 0.5-3 parts of additives; the best is 100 parts of polyvinyl chloride, 30 parts of silicon powder, 50 parts of plasticizer, 6 parts of stabilizer, and 2 parts of additives.

[0029] Specifically, the preparation method of silicon micropowder is:

[0030] The kaolin ore is sequentially processed through water washing, pulping, sieving, magnetic separation, pickling, flotation and cleaning to obtain quartz sand with a particle size of less than 0.1 mm. The quartz sand is ground and graded by a sand mill to prepare silicon micropowder with a particle size of 1100 to 1350 mesh. The intensity of the magnetic separation is 0.6-0.8T, the acid solution for pickling is a mixture of oxalic acid, citric acid and hydrogen peroxide, the solid-liquid ratio of the acid solution to the quartz sand is 1:1, and the collector for flotation is dodecylamine, and the dosage is 40g / t-80g / t of ore pulp.

[0031] Optimally, the particle size of the silica powder is 1200 mesh.

[0032] The plasticizer is one or more of dioctyl terephthalate, dioctyl phthalate, and soybean oil.

[0033] The stabilizer is calcium zinc stabilizer.

[0034] The auxiliary agent is one of tricresyl phosphate, stearic acid or polyethylene wax.

[0035] S2, after mixing polyvinyl chloride, plasticizer and additives, crushing them, mixing them to 110-130° C., adding silicon powder and stabilizer, and continuing to mix them to 140-160° C. to obtain a mixture;

[0036] S3. The mixed material is put into a twin-screw extruder, melt-mixed, extruded and granulated at an extrusion temperature of 150-180° C. to obtain a PVC cable material.

[0037] In addition, the present invention protects the PVC cable material obtained by the above preparation method.

[0038] In addition, the present invention protects the application of the above PVC cable material in the field of electric vehicles.

[0039] <Example 1>

[0040] A method for preparing a PVC cable material comprises the following steps:

[0041] S1. After the kaolin ore is sequentially processed by water washing, slurrying, sieving, magnetic separation, acid washing, flotation and cleaning, quartz sand with a particle size less than 0.1 mm is obtained, and the quartz sand is ground and graded by a sand mill to prepare 1200-mesh silicon micropowder; wherein the intensity of magnetic separation is 0.6 T, the solid-liquid ratio of acid solution to quartz sand is 1:1, and the flotation collector is dodecylamine, and the dosage is 40 g / t ore pulp.

[0042] S2, weigh polyvinyl chloride, dioctyl terephthalate, silicon powder, calcium zinc stabilizer and stearic acid in parts by weight, and set aside; wherein, polyvinyl chloride 100 parts, silicon powder 30 parts, dioctyl terephthalate 50 parts, calcium zinc stabilizer 6 parts, stearic acid 2 parts;

[0043] S3, after mixing polyvinyl chloride, dioctyl terephthalate and stearic acid, crushing them, mixing them to 110-130° C., adding silicon micropowder and calcium zinc stabilizer, and continuing to mix them to 140-160° C. to obtain a mixture;

[0044] S4. The mixed material is put into a twin-screw extruder, melt-mixed, extruded and granulated at an extrusion temperature of 150-180° C. to obtain a PVC cable material.

[0045] <Example 2>

[0046] A method for preparing a PVC cable material comprises the following steps:

[0047] S1. After the kaolin ore is sequentially subjected to water washing, slurrying, sieving, magnetic separation, pickling, flotation and cleaning treatment, quartz sand with a particle size of less than 0.1 mm is obtained, and the quartz sand is ground and graded by a sand mill to prepare 1100 mesh silicon micropowder, wherein the intensity of the magnetic separation is 0.8 T, the acid solution for pickling is a mixture of oxalic acid, citric acid and hydrogen peroxide, the solid-liquid ratio of the acid solution to the quartz sand is 1:1, and the collector for flotation is dodecylamine, and the dosage is 80 g / t of ore pulp;

[0048] S2, weigh polyvinyl chloride, dioctyl phthalate, silicon powder, calcium zinc stabilizer and polyethylene wax in parts by weight, and set aside; wherein, polyvinyl chloride 100 parts, silicon powder 28 parts, dioctyl phthalate 50 parts, calcium zinc stabilizer 6 parts, polyethylene wax 0.5 parts;

[0049] S3, after mixing polyvinyl chloride, dioctyl phthalate and polyethylene wax, crushing them, mixing them to 110-130° C., adding silicon micropowder and calcium zinc stabilizer, and continuing to mix them to 140-160° C. to obtain a mixture;

[0050] S4. The mixed material is put into a twin-screw extruder, melt-mixed, extruded and granulated at an extrusion temperature of 150-180° C. to obtain a PVC cable material.

[0051] <Example 3>

[0052] A method for preparing a PVC cable material comprises the following steps:

[0053] The kaolin ore is sequentially processed through water washing, pulping, sieving, magnetic separation, pickling, flotation and cleaning to obtain quartz sand with a particle size of less than 0.1 mm. The quartz sand is ground and graded by a sand mill to prepare 1350 mesh silicon micropowder, wherein the intensity of the magnetic separation is 0.7 T, the acid solution for pickling is a mixture of oxalic acid, citric acid and hydrogen peroxide, the solid-liquid ratio of the acid solution to the quartz sand is 1:1, and the collector for flotation is dodecylamine, and the dosage is 60 g / t of ore pulp.

[0054] S2, weigh polyvinyl chloride, soybean oil, silicon powder, calcium zinc stabilizer and tricresyl phosphate in parts by weight, and set aside; wherein, polyvinyl chloride 100 parts, silicon powder 28 parts, soybean oil 50 parts, calcium zinc stabilizer 6 parts, tricresyl phosphate 0.5 parts;

[0055] S3, after mixing polyvinyl chloride, plasticizer and tricresyl phosphate, crushing, mixing to 110-130° C., adding silicon micropowder and calcium zinc stabilizer, and continuing to mix to 140-160° C. to obtain a mixture;

[0056] S4. The mixed material is put into a twin-screw extruder, melt-mixed, extruded and granulated at an extrusion temperature of 150-180° C. to obtain a PVC cable material.

[0057] <Comparative Example 1>

[0058] A method for preparing a PVC cable material comprises the following steps:

[0059] S1. Weigh polyvinyl chloride, calcium powder and calcium zinc stabilizer in order by weight for later use; wherein, polyvinyl chloride 100 parts, calcium powder 30 parts, calcium zinc stabilizer 6 parts;

[0060] S3, mixing polyvinyl chloride, calcium powder and calcium zinc stabilizer, crushing, and mixing at 140-160° C. to obtain a mixture;

[0061] S4. The mixed material is put into a twin-screw extruder, melt-mixed, extruded and granulated at an extrusion temperature of 150-180° C. to obtain a PVC cable material.

[0062] The PVC cable materials prepared in Example 1 and Comparative Example 1 were subjected to performance tests, and the test results are shown in Table 1.

[0063] Table 1

[0064]

[0065]

[0066] As shown in Table 1, the PVC cable material of the present invention uses silicon powder as raw material, which increases the volume resistivity of the cable material by one order of magnitude compared with calcium powder, and greatly improves the insulation performance. Stabilizers and plasticizers improve the aging resistance of PVC cable materials while improving their thermal stability, thereby extending the service life of power cables.

[0067] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A PVC cable material, characterized in that: The composition comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 28-35 parts of silicon powder, 50 parts of plasticizer, 6 parts of stabilizer, and 0.5-3 parts of additives.

2. A PVC cable material according to claim 1, characterized in that: The composition comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 30 parts of silicon powder, 50 parts of plasticizer, 6 parts of stabilizer, and 2 parts of additives.

3. A PVC cable material according to claim 1, characterized in that: The silicon micropowder is prepared from kaolin ore through slurrying, screening, magnetic separation, acid washing, flotation, ball milling classification and ultrafine grinding.

4. A PVC cable material according to claim 3, characterized in that: The particle size of the silicon micropowder is 1100-1350 meshes.

5. A PVC cable material according to claim 1, characterized in that: The plasticizer is one or more of dioctyl terephthalate, dioctyl phthalate, and soybean oil.

6. A PVC cable material according to claim 1, characterized in that: The stabilizer is calcium zinc stabilizer.

7. A PVC cable material according to claim 1, characterized in that: The auxiliary agent is one of tricresyl phosphate, stearic acid or polyethylene wax.

8. A method for preparing a PVC cable material according to any one of claims 1 to 7, characterized in that: The specific steps include: S1. Weigh polyvinyl chloride, plasticizer, silicon powder, stabilizer and additives in order by weight and set aside; wherein, polyvinyl chloride is 100 parts, silicon powder is 28-35 parts, plasticizer is 50 parts, stabilizer is 6 parts, and additive is 0.5-3 parts; S2, after mixing polyvinyl chloride, plasticizer and additives, crushing them, mixing them to 110-130° C., adding silicon micropowder and stabilizer, and continuing to mix them to 140-160° C. to obtain a mixture; S3. The mixed material is put into a twin-screw extruder, melt-mixed, extruded and granulated at an extrusion temperature of 150-180° C. to obtain a PVC cable material.

9. The method for preparing a PVC cable material according to claim 8, characterized in that: The preparation method of the silicon micropowder is: The kaolin ore is sequentially processed through water washing, pulping, sieving, magnetic separation, pickling, flotation and cleaning to obtain quartz sand with a particle size of less than 0.1 mm. The quartz sand is ground and graded by a sand mill to prepare silicon micropowder with a particle size of 1100 to 1350 mesh. The intensity of the magnetic separation is 0.6-0.8T, the acid solution for pickling is a mixture of oxalic acid, citric acid and hydrogen peroxide, the solid-liquid ratio of the acid solution to the quartz sand is 1:1, and the collector for flotation is dodecylamine, and the dosage is 40g / t-80g / t of ore pulp.

10. Application of a PVC cable material according to any one of claims 1 to 7 in the field of electric vehicles.

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