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CN-115862969-B - Natural crosslinked cable preparation process and cable

CN115862969BCN 115862969 BCN115862969 BCN 115862969BCN-115862969-B

Abstract

The invention relates to a natural crosslinked cable preparation process and a cable, wherein the natural crosslinked cable preparation process comprises the steps of firstly obtaining a conductor, secondly obtaining a natural crosslinked raw material, extruding and coating the periphery of the conductor to obtain a product to be crosslinked, thirdly obtaining the product to be crosslinked, standing the product to be crosslinked for natural crosslinking, and obtaining a semi-finished cable after the natural crosslinking is completed, fourthly checking the semi-finished cable obtained in the third step, and obtaining a qualified product, namely a finished natural crosslinked cable, wherein the cable is prepared by adopting the natural crosslinked cable preparation process. The cable insulation extrusion coating is carried out by adopting a natural crosslinking process, so that the production period is shortened, and the production cost is reduced.

Inventors

  • HE ZHIYONG
  • WANG SIYUAN
  • XU JIANYU

Assignees

  • 广州电缆厂有限公司

Dates

Publication Date
20260505
Application Date
20221117

Claims (9)

  1. 1. The preparation process of the natural crosslinked cable is characterized by comprising the following steps of: step one, obtaining a conductor; Step two, extruding and coating natural crosslinking raw materials on the periphery of the conductor to obtain a product to be crosslinked, wherein the natural crosslinking raw materials comprise, by weight, 20% of EVA, 4% of metallocene PE, 6% of POE, 4.5% of a compatilizer, 50% of aluminum hydroxide, 10% of magnesium hydroxide, 0.2% of an anti-copper agent, 0.3% of an antioxidant, 2% of silane, 2% of an organosilicon flame retardant and 1% of a lubricant; thirdly, standing the obtained product to be crosslinked for natural crosslinking, and obtaining a semi-finished cable after the natural crosslinking is completed; and step four, checking the semi-finished cable obtained in the step three, wherein the qualified product is the finished natural crosslinked cable.
  2. 2. The process for preparing a natural cross-linked cable according to claim 1, wherein in the third step: the temperature of the obtained product to be crosslinked is 25-27 ℃.
  3. 3. The process for preparing a natural cross-linked cable according to claim 1, wherein in the second step, a single screw extruder with a compression ratio of 1.24 is used for extrusion operation, and the extrusion process sequentially comprises a feeding section, a melting section and an extrusion section along the flow direction of the natural cross-linked raw material; The temperature in the die of the feeding section is 115-125 ℃, the temperature in the die of the melting section is 125-135 ℃, and the temperature in the die of the extrusion section is 135-140 ℃.
  4. 4. The process for preparing a natural crosslinked cable according to claim 3, wherein the feeding section comprises a first feeding section and a second feeding section in sequence, the in-mold temperature of the first feeding section is 115-120 ℃, and the in-mold temperature of the second feeding section is 120-125 ℃.
  5. 5. The process for preparing a natural crosslinked cable according to claim 3, wherein the melting section comprises a first melting section and a second melting section in sequence, the in-mold temperature of the first melting section is 125-130 ℃, and the in-mold temperature of the second melting section is 130-135 ℃.
  6. 6. The process for preparing a natural crosslinked cable according to claim 3, wherein the extrusion section comprises a first extrusion section, a second extrusion section and a third extrusion section in sequence, the in-mold temperature of the first extrusion section is 135-137 ℃, the in-mold temperature of the second extrusion section is 137-140 ℃, and the in-mold temperature of the third extrusion section is 137-140 ℃.
  7. 7. A process for the preparation of a natural cross-linked cable according to claim 3, characterized in that the residence time of the natural cross-linking raw material in the screw is less than or equal to 10 minutes.
  8. 8. A process for preparing a natural crosslinked cable according to claim 3, wherein in the second step, parameters of the die core sleeve of the single screw extruder are as follows: α=(π*D0 2 /4-π*D1 2 /4）/（π*(2*D3+D4) 2 /4-π*D4 2 /4); Wherein D0 represents the diameter of a die sleeve, D1 represents the diameter of a die core, D3 represents the insulation thickness of a cable to be prepared, D4 represents the diameter of a conductor of the cable to be prepared, and alpha represents the stretch ratio of the cable to be prepared, so that the alpha is more than or equal to 2.4 and less than or equal to 2.8; the core diameter D1 and the conductor diameter D4 satisfy: 1.0mm≤D1-D4≤1.5mm。
  9. 9. The cable is characterized by being prepared by adopting the natural crosslinked cable preparation process according to any one of claims 1-8.

Description

Natural crosslinked cable preparation process and cable Technical Field The disclosure relates to the technical field of cable preparation processes, in particular to a natural crosslinked cable preparation process. Background At present, the production process of the cable insulation sleeve generally has the following two modes in the preparation of insulation materials: 1. the irradiation crosslinking, as disclosed in patent CN112735707A, comprises the steps of heating and mixing the raw materials of the insulating sleeve, injecting into an extruder for extrusion molding, irradiating the insulating sleeve by ultraviolet light, cooling and molding; 2. The production method of the silane crosslinked low-smoke halogen-free flame-retardant polyolefin cable material is disclosed in a patent CN111508662B, wherein a base material and a catalyst master batch are mixed, extruded by a single screw extruder and then placed in a warm water bath or steam for 6-8 hours. The preparation methods of the insulating materials in the two production processes have the following defects: 1. The insulating material is prepared by adopting an irradiation crosslinking method, and the following steps are needed to be carried out when the cable is produced: The method comprises the steps of (1) obtaining a conductor, (2) extruding molten insulating materials on the periphery of the conductor, (3) carrying out irradiation crosslinking on the conductor extruded with the insulating materials to obtain a finished product, (4) inspecting the finished product, and packaging and putting the finished product on a disc; When irradiation crosslinking is carried out, a consignment processing mode is generally needed, a manufacturer who owns irradiation equipment is consigned to carry out irradiation operation, a great amount of cost is generated in the process, meanwhile, the manufacturer who owns the irradiation equipment needs to schedule, so that the stability of a production period cannot be ensured, the cable construction period cannot be controlled by the cable manufacturer, and a plurality of uncertain factors are added; 2. the insulating material is prepared by adopting steam crosslinking, and when the cable is produced, the following steps are needed: The method comprises the steps of (1) obtaining a conductor, (2) extruding molten insulating materials on the periphery of the conductor, (3) performing steam cross-linking on the conductor extruded with the insulating materials to obtain a finished product, (4) inspecting the finished product, and packaging and putting the finished product on a disc; When the steam crosslinking is carried out, a steam environment is needed to be prepared firstly, so that the cable can be subjected to steam crosslinking in time after extrusion insulation, and the production period of the steam crosslinking is relatively stable compared with that of irradiation crosslinking, but the time spent on the steam crosslinking is relatively long, so that the production period is relatively long, a large amount of energy is consumed, and the production cost is further increased. Disclosure of Invention In order to solve the problems in the prior art, the disclosure aims to provide a preparation process of a natural crosslinked cable. The cable can be prepared in a natural crosslinking mode, has important guiding significance for the actual production process of the cable, and is beneficial to efficient and energy-saving production of the cable. The preparation process of the natural crosslinked cable comprises the following steps: step one, obtaining a conductor; Step two, extruding and coating natural crosslinking raw materials on the periphery of the conductor to obtain a product to be crosslinked; thirdly, standing the obtained product to be crosslinked for natural crosslinking, and obtaining a semi-finished cable after the natural crosslinking is completed; and step four, checking the semi-finished cable obtained in the step three, wherein the qualified product is the finished natural crosslinked cable. Preferably, in the third step, the temperature at which the obtained product to be crosslinked is naturally crosslinked is 25-27 ℃. Preferably, in the second step, the natural crosslinking material comprises the following components, by weight, 20% of EVA, 4% of metallocene PE, 6% of POE, 4.5% of a compatilizer, 50% of aluminum hydroxide, 10% of magnesium hydroxide, 0.2% of an anti-copper agent, 0.3% of an antioxidant, 2% of silane, 2% of an organosilicon flame retardant and 1% of a lubricant. Preferably, in the second step, a single screw extruder with a compression ratio of 1.24 is used for extrusion operation, and the extrusion process sequentially comprises a feeding section, a melting section and an extrusion section along the flow direction of the natural crosslinking raw material; The temperature in the die of the feeding section is 115-125 ℃, the temperature in the die of the melting section is 125-135