CN-122011543-A - High-performance insulating composite material for 525kV submarine cable and preparation process thereof

Abstract

The invention discloses a high-performance insulating composite material for 525kV submarine cables and a preparation process thereof, and the high-performance insulating composite material comprises the following steps of S1, raw materials are mixed, wherein the raw materials are added into a raw material mixing box according to the formula proportion, a stirring motor arranged at the top of a top plate drives a central stirring rotating shaft to rotate so as to drive all components to synchronously rotate, S2, primary dispersion, namely, under the drive of the central stirring rotating shaft, a stirring porous screen plate is used for carrying out primary interception and dispersion on the raw materials, so that all the raw materials are uniformly distributed in the raw material mixing box, S3, high-speed stirring, namely, a stirring rectangular frame and accessory components thereof are driven to synchronously rotate through a central mounting sleeve, and the raw materials are rapidly stirred by utilizing a rotating mounting shaft and a swinging stirring plate. The invention prevents incomplete raw material addition in the production process of the composite material production equipment and improves the overall quality of the composite material produced by the composite material production equipment.

Inventors

• CHEN YUE
• SU CHAOHUI
• WANG LU
• XU HAIBIN
• CHEN XINYUE
• LIU PENGCHENG
• KANG HAIDONG
• LIU LEI
• ZHANG XINYU
• WANG YUEBIN
• CAI MENG
• LIU SHUZHENG
• ZHANG SHIJIE

Assignees

• 广东阳江市创源海上风电综合投资有限公司
• 三峡新能源阳江发电有限公司
• 中国长江三峡集团有限公司
• 中国能源建设集团广东省电力设计研究院有限公司
• 宁波东方电缆股份有限公司

Dates

Publication Date

20260512

Application Date

20251229

Claims (10)

1. 1. The high-performance insulating composite material for the 525kV submarine cable is characterized by comprising the following raw materials in parts by weight: 45-55 parts of low-density polyethylene, 20-30 parts of high-density polyethylene, 8-15 parts of ethylene-vinyl acetate copolymer, 4-8 parts of silane grafted polyethylene, 0.8-2.5 parts of magnesium oxide, 0.8-2.5 parts of alumina micropowder, 0.1-0.3 part of antioxidant, 0.1-0.3 part of ultraviolet absorber and 0.1-0.4 part of surface modifier.
2. 2. A preparation process of a high-performance insulating composite material for a 525kV submarine cable is characterized by comprising the following steps of: S1, raw materials are mixed, namely the raw materials are added into a raw material mixing box (3) according to the formula proportion, and a stirring motor (502) arranged at the top of a top plate (501) drives a central stirring rotating shaft (503) to rotate so as to drive all components to synchronously rotate; S2, primary dispersion, namely, under the drive of a central stirring rotating shaft (503), a stirring porous screen plate (509) is used for carrying out primary interception and dispersion on raw materials, so that the raw materials are uniformly distributed in a raw material mixing box (3); s3, stirring at a high speed, namely driving a stirring rectangular frame (506) and accessory components thereof to synchronously rotate through a central mounting sleeve (505), and rapidly stirring raw materials by utilizing a rotating mounting shaft (507) and a swinging stirring plate (508); S4, bottom reflux mixing, namely stirring up the raw materials at the bottom of the raw material mixing box (3) through a spiral material guiding bottom plate (504), so that three-dimensional circulation mixing of the raw materials is realized, and the mixing efficiency and uniformity are improved; s5, feeding the materials to an extruder, namely after the materials are mixed, driving a rotary hollow pipe (402) and components thereof to synchronously rotate through a feeding rotary motor (401) at the end part of a material guiding special-shaped box (2), driving a feeding trough roller (403) to operate, and conveying the mixed materials to the inside of the extruder main body (1).
3. 3. The preparation process of the high-performance insulating composite material for the 525kV submarine cable according to claim 2, wherein one end of the top of the extruder main body (1) is fixedly connected with the guide special-shaped box (2), the top end of the guide special-shaped box (2) is fixedly connected with the raw material mixing box (3), a dynamic circulation feeding mechanism (4) is arranged on the guide special-shaped box (2), the dynamic circulation feeding mechanism (4) comprises a feeding rotary motor (401), an output shaft of the feeding rotary motor (401) is connected with a rotary hollow tube (402), a feeding groove roller (403) is fixedly sleeved on the outer side of the rotary hollow tube (402), a guide flat box (404) is fixedly sleeved on the outer side of the rotary hollow tube (402), and a telescopic extrusion bag (405) is fixedly connected on one side of the guide flat box (404) corresponding to the outer side of the feeding groove roller (403).
4. 4. The preparation process of the high-performance insulating composite material for the 525kV submarine cable according to claim 3, wherein a rectangular end box (406) is fixedly connected to the end part of the guide special-shaped box (2) at the position corresponding to the outer side of the rotary hollow tube (402), a gas storage extrusion vertical box (407) is fixedly connected to the top end of the rectangular end box (406), a driving telescopic rod (408) is arranged in the gas storage extrusion vertical box (407), an extrusion sliding block (409) is fixedly connected to the bottom end of the driving telescopic rod (408), and the extrusion sliding block (409) is in sliding sealing fit with the gas storage extrusion vertical box (407).
5. 5. The preparation process of the high-performance insulating composite material for the 525kV submarine cable according to claim 4, wherein the inner cavity of the gas storage extrusion vertical box (407), the inner cavity of the rectangular end box (406), the inner cavity of the rotary hollow tube (402) and the inner cavity of the gas guide flat box (404) are sequentially communicated, and the outer side of the end part of the telescopic extrusion bag (405) is tightly and slidably attached to the outer side of the feeding groove roller (403).
6. 6. The preparation process of the high-performance insulating composite material for the 525kV submarine cable according to claim 5, wherein a multistage mixing stirring mechanism (5) is arranged inside the raw material mixing box (3), the multistage mixing stirring mechanism (5) comprises a mounting top plate (501), the mounting top plate (501) is fixedly connected to the top end of the raw material mixing box (3), the top end of the mounting top plate (501) is fixedly connected with a stirring motor (502), an output shaft of the stirring motor (502) is fixedly connected with a central stirring rotating shaft (503), a central mounting sleeve (505) and a spiral material guiding bottom plate (504) are arranged on the central stirring rotating shaft (503) up and down, a plurality of stirring rectangular frames (506) are annularly distributed outside the central mounting sleeve (505), a rotating mounting shaft (507) is rotatably mounted on the stirring rectangular frames (506), and the rotating mounting shaft (507) is fixedly connected with a swinging stirring plate (508).
7. 7. The process for preparing the high-performance insulating composite material for the 525kV submarine cable according to claim 6, wherein the stirring porous screen plate (509) is sleeved on the central stirring rotating shaft (503), and the stirring porous screen plate (509) is positioned at the upper end of the central installation sleeve (505).
8. 8. The preparation process of the high-performance insulating composite material for the 525kV submarine cable according to claim 7, wherein the outer side of the spiral material guiding bottom plate (504) is in sliding fit with the inner wall of the raw material mixing box (3), a plurality of through holes are formed in the swinging stirring plate (508), and the two through holes at the top of the stirring porous screen plate (509) are staggered.
9. 9. The preparation process of the high-performance insulating composite material for the 525kV submarine cable according to claim 2, wherein a top splicing protection mechanism (6) is arranged at the top of the raw material mixing box (3), the top splicing protection mechanism (6) comprises an annular mounting frame (601), the annular mounting frame (601) is fixedly sleeved on the top end of the raw material mixing box (3), an annular mounting groove (602) is formed in the top surface of the annular mounting frame (601), a movable annular clamping ring (603) is arranged in the annular mounting groove (602), a protection conical net (604) is fixedly connected to the middle of the top end of the annular clamping ring (603), and a control pull handle (605) is fixedly connected to the protection conical net (604).
10. 10. The preparation process of the high-performance insulating composite material for the 525kV submarine cable according to claim 9, wherein the outer side of the annular clamping ring (603) is tightly and slidably attached to the inner wall of the annular mounting groove (602), and slotted holes are uniformly formed in the protective conical net (604) at equal intervals along the circumferential direction.

Description

High-performance insulating composite material for 525kV submarine cable and preparation process thereof Technical Field The invention relates to the technical field of submarine cable production, in particular to a high-performance insulating composite material for a 525kV submarine cable and a preparation process thereof. Background A high-voltage direct current transmission (HVDC) submarine cable is used as an important power transmission technology, is widely applied to a scene of crossing ocean or large-scale power transmission, has the main functions of transmitting power from land to islands, transoceanic transmission lines or between intercontinental power networks, and realizes large-capacity and low-loss long-distance power transmission, and the submarine cable generally comprises a conductive layer, an insulating layer, a protective layer and the like in structural design, wherein the high performance of the insulating material directly relates to the transmission efficiency and the service life of the cable, so that the high-performance insulating composite material occupies a vital position in the high-voltage direct current transmission submarine cable; High-performance insulating materials are required to have higher pressure resistance, thermal stability and ageing resistance so as to ensure that the cable stably works under high-pressure, high-temperature and severe submarine environments, and the insulating composite materials are usually mixed by a plurality of high-performance materials, wherein the high-performance insulating composite materials comprise functional powder raw materials, and the powder plays a vital role in the production process of the materials; Specifically, the existing high-performance insulating composite material production equipment lacks an effective auxiliary structure in the feeding process to ensure uniform conveying of various raw materials, and particularly in the adding process of functional powder raw materials, the powder particles are usually tiny and are easy to adhere to corners of a pipeline, so that the raw materials cannot be completely and uniformly mixed into the material, and the adhesion phenomenon not only can cause loss of part of functional components, but also can influence the final performance of the composite material, and further influence the electrical performance and long-term stability of a cable insulating layer; Therefore, with the continuous development of the high-voltage direct-current transmission technology, higher requirements are put on production equipment of submarine cables, particularly, in the production process of insulating materials, how to optimize a feeding structure and avoid adhesion and blockage of powder raw materials becomes a key for improving the quality of high-performance insulating composite materials, and the reliability and stability of the high-voltage direct-current transmission submarine cables in long-term use can be ensured only by solving the technical problems. Disclosure of Invention The invention provides a high-performance insulating composite material for a 525kV submarine cable and a preparation process thereof, which can effectively solve the problems in the background technology. In order to achieve the above purpose, the present invention provides the following technical solutions: A high performance insulation composite for a 525kV submarine cable, the high performance insulation composite comprising the following raw materials in parts by weight: 45-55 parts of low-density polyethylene, 20-30 parts of high-density polyethylene, 8-15 parts of ethylene-vinyl acetate copolymer, 4-8 parts of silane grafted polyethylene, 0.8-2.5 parts of magnesium oxide, 0.8-2.5 parts of alumina micropowder, 0.1-0.3 part of antioxidant, 0.1-0.3 part of ultraviolet absorber and 0.1-0.4 part of surface modifier. The invention also provides a preparation process of the high-performance insulating composite material for the 525kV submarine cable, which comprises the following steps of: s1, raw materials are mixed, namely the raw materials are added into a raw material mixing box according to the formula proportion, and a stirring motor arranged at the top of a top plate drives a central stirring rotating shaft to rotate so as to drive all components to synchronously rotate; S2, primary dispersion, namely under the drive of a central stirring rotating shaft, the stirring porous screen plate is used for carrying out primary interception and dispersion on the raw materials, so that the raw materials are uniformly distributed in the raw material mixing box; s3, stirring at a high speed, namely driving the stirring rectangular frame and accessory components thereof to synchronously rotate through a central mounting sleeve, and rapidly stirring the raw materials by utilizing a rotary mounting shaft and a swinging stirring plate; S4, bottom reflux mixing, namely stirring up the raw materials at the bottom of the raw m