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A halogen-free flame-retardant heat-shrinkable busbar sleeve and its preparation method

A heat-shrinkable busbar sleeve and color masterbatch technology are applied in the field of halogen-free flame retardant heat-shrinkable busbar sleeve and its preparation, which can solve construction difficulties, short service life, and flame retardant performance of the busbar heat-shrinkable sleeve. It can achieve the effects of good drip resistance, low smoke generation, and outstanding high and low temperature resistance.

Active Publication Date: 2016-06-01
CHANGYUAN ELECTRONICS DONGGUAN +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problems of poor flame retardancy, short service life and difficult construction of existing busbar heat-shrinkable sleeves, and provide a kind of heat-shrinkable sleeve with excellent insulation performance, good flame retardancy, long service life and convenient construction. Busbar heat-shrinkable sleeve and preparation method thereof

Method used

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  • A halogen-free flame-retardant heat-shrinkable busbar sleeve and its preparation method
  • A halogen-free flame-retardant heat-shrinkable busbar sleeve and its preparation method
  • A halogen-free flame-retardant heat-shrinkable busbar sleeve and its preparation method

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preparation example Construction

[0037] The present invention also proposes a method for preparing the above-mentioned halogen-free flame-retardant heat-shrinkable busbar sleeve, which includes the following steps:

[0038] Step 1: Weigh 100 parts of vinyl polymer, 10-20 parts of red phosphorus masterbatch, 30-70 parts of magnesium hydroxide, 0.5-3 parts of light stabilizer, 3-8 parts of antioxidant, and 2 parts of lubricant -5 parts, 5-8 parts of color masterbatch;

[0039] Step 2: After mixing and granulating with an internal mixer or a parallel twin-screw extruder, extrude into a pipe with a single-screw extruder;

[0040] Step 3: The pipe is cross-linked by cobalt 60 or electron accelerator 50-160KGy radiation, and the pipe after radiation cross-linking is expanded 2-4 times at a temperature of 85-135°C.

preparation Embodiment 1

[0042] Weigh the components according to the weights listed in the table below.

[0043]

[0044]

[0045] The above-mentioned materials are mixed and granulated by an internal mixer, and then extruded into pipes by a single-screw extruder.

[0046] The pipe was cross-linked by cobalt 60 radiation at 50KGy, and the radiation cross-linked pipe was expanded by 2.5 times at a temperature of 95°C to obtain a busbar heat-shrinkable tube with the following properties.

[0047] Flame retardancy: passed the vw-1 flame retardancy test.

[0048] The tensile strength is 14.7MPa, and the elongation at break is 585%.

[0049] After the heat-shrinkable sleeve of the busbar is restricted to shrink, the V-shaped notch is cut and aged at 120°C / 168h, and the crack does not extend.

[0050] After aging at 150℃ / 1200h, the elongation at break is 421%.

[0051] After 120°C / 168h aging, and then -55°C / 4h low temperature treatment, the power frequency withstand voltage test and lightning impa...

preparation Embodiment 2

[0053] Weigh the components according to the weights listed in the table below.

[0054]

[0055] The above-mentioned materials are mixed and granulated by an internal mixer, and then extruded into pipes by a single-screw extruder.

[0056] The tube was cross-linked by radiation at 160 KGy of an electron accelerator, and the tube after radiation cross-linking was expanded 2.5 times at a temperature of 110° C. to obtain a heat-shrinkable busbar tube with the following properties.

[0057] Flame retardancy: passed the vw-1 flame retardancy test.

[0058] The tensile strength is 18.3MPa, and the elongation at break is 537%.

[0059] After the heat-shrinkable sleeve of the busbar is restricted to shrink, the V-shaped notch is cut and aged at 120°C / 168h, and the crack does not extend.

[0060] After aging at 150℃ / 1200h, the elongation at break is 461%.

[0061] After 120°C / 168h aging, and then -55°C / 4h low temperature treatment, the power frequency withstand voltage test and li...

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Abstract

The invention discloses a halogen-free flame-retardant heat-shrinkable busbar casing which is composed of the following components in parts by weight: 100 parts of vinyl polymer, 10-20 parts of red phosphorus master batch, 30-70 parts of magnesium hydroxide, 0.5-3 parts of light stabilizer, 3-8 parts of antioxidant, 2-5 parts of lubricant, and 5-8 parts of color master batch, wherein the vinyl polymer is a blend of two or more of the following materials: low-density polyethylene, medium-density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-methacrylate copolymer, an ethylene-butyl acrylate copolymer, an ethylene-octene copolymer, and an ethylene propylene rubber; the red phosphorus master batch is a master batch formed by mixing microencapsulated red phosphorus with an ethylene-vinyl acetate copolymer, and the content of the microencapsulated red phosphorus is 60%; the light stabilizer is di(2,2,6,6-tetramethyl-4-piperidyl) dicholesteryl sebacate. The halogen-free flame-retardant heat-shrinkable busbar casing disclosed by the invention is excellent in insulation performance, good in flame retardant performance, long in service life, and convenient to construct.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant heat-shrinkable busbar bushing and a preparation method thereof, in particular to a heat-shrinkable busbar bushing for insulation protection of power transmission and transformation switch cabinets and substation internal and external busbars and a preparation method thereof. Background technique [0002] Busbar heat-shrinkable sleeves are widely used in substations, transformers and switchgears. They mainly play the role of insulation protection, reducing the volume of switchgear and other equipment, and preventing small animals from getting an electric shock. During the "Twelfth Five-Year Plan" period, State Grid plans to invest a total of 1.5 trillion yuan in smart grids with an annual quota of 300 billion yuan, of which half will be used for distribution network construction and half for transmission network construction; The investment quota for network construction accounts for half of the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L23/06C08L23/16C08K13/06C08K9/10C08K3/22C08K3/02C08K5/3435C08K5/134C08K5/526C08J3/28C08J3/24
CPCB29C71/04C08L23/0853C08L23/0869C08L2201/02C08L2201/08C08L2201/22C08L2203/18C08L2205/025C08L2205/035C08L2207/066C08L2312/06C08L23/06C08K13/06C08K9/10C08K2003/026C08K5/3435C08K2003/2224C08L23/0815C08L23/16
Inventor 曾志安鲁雪莲李可涛徐成谭光远刘晓播鲁尔军
Owner CHANGYUAN ELECTRONICS DONGGUAN
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