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Insulating composition, insulating article, preparation method and electrical cable accessory thereof

A technology of cable accessories and compositions, applied in the field of insulating compositions, can solve the problems of complex process, high cost and the like

Inactive Publication Date: 2015-09-30
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the two layers need to be prepared and installed separately, which leads to complicated process and high cost

Method used

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  • Insulating composition, insulating article, preparation method and electrical cable accessory thereof
  • Insulating composition, insulating article, preparation method and electrical cable accessory thereof
  • Insulating composition, insulating article, preparation method and electrical cable accessory thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0088] This example shows the effect of silane coupling agents on elongation at break.

[0089] The specific silane coupling agent KH450 with two hydrolyzable groups is used for the surface treatment of BT.

[0090] In a weight ratio of 1:10, KH450 was dissolved in an amount of 1 wt% of BT in a solution of 10 wt% water in ethanol (deionized water / ethanol = 1:9 by weight) to obtain 9 wt% KH450 solution. Spray the solution evenly on the surface of the BT. Then, the sprayed BT was dried in an oven at 80 °C for 3 h to remove solvent and moisture. 20 parts by volume of treated BT with 80 parts by volume of silicone rubber and 0.56 parts by volume of crosslinker 2,5-dimethyl-2,5-bis(tert-butylperoxy) through two roller mills (Model X(S)K-160, manufactured by Shanghai Rubber Machinery Factory, China) was mixed. The mixture was then molded into a plate with a size of 20 mm × 20 mm × 2 mm, and passed through a flat press vulcanizer (manufactured by Dongguan Hsin-chi Jingmi Machiner...

example 6-8

[0095] The procedure of Example 1 was repeated except that the components were used in the amounts shown in Table 2. In Example 8, BST was used in place of BT and subjected to the same surface treatment process. Samples were evaluated by testing as described above. The test results of dielectric constant and breakdown strength are shown in Table 2. The results of Example 1 are also listed in Table 2 for comparison.

[0096] Table 2

[0097]

[0098] These examples show the effect of BT and BST loading on dielectric constant and breakdown strength. BT and BST are ferroelectric ceramics with high dielectric constant and good insulation properties. By adding ferroelectric ceramics BT or BST to silicone rubber, the dielectric constant (ε) significantly increases with the concentration of ferroelectric ceramics. Meanwhile, unlike the case of using a conventional material with high ε, the breakdown strength is still maintained at 15 kV or higher, exhibiting good insulation...

example 9

[0100] A small amount of zinc oxide whiskers was used in this example. The process was the same as in Example 1, except that the components shown in Table 3 were used. Table 3 shows the test results of dielectric constant and breakdown strength.

[0101] table 3

[0102]

[0103] ZnO whiskers have a cross-shaped fork morphology and are semiconducting. The unique morphology connects BTs to form a network, which is beneficial to obtain a high dielectric constant while maintaining a breakdown strength greater than 15 kV. Compared to Example 1, the BT loading in Example 9 is lower, yet due to the presence of ZnO whiskers, the dielectric constant is higher and at the same time the breakdown strength remains at 15 kV.

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Abstract

An insulating composition comprises: about 70-100 parts by volume of a polymeric material, about 5-30 parts by volume of a ceramic filler (2) which is surface-treated by a bifunctional coupling agent in an amount of about 0.1wt% to about 4wt% of the ceramic filler; about 0.1-5 parts by volume of a crosslinking agent; about 0-6 parts by volume of conductive powder (3); and about 0-6 parts by volume of ZnO whisker (4). A preparation method for making the insulating composition, an insulating article such as an electrical cable accessory, and a use thereof are provided.

Description

technical field [0001] The present invention relates to insulating compositions, methods for preparing insulating compositions, insulating articles made from insulating compositions and cable accessories. In particular, the insulating composition is suitable for the preparation of cable accessories, such as prefabricated or cold-shrunk cable terminals, and the cable accessories can be used for splicing or terminating medium voltage (MV) power cables. Background technique [0002] Power cables are widely used to distribute power across large grids or networks, delivering power from power plants to power consumers. The cable can be configured to carry high voltage (greater than about 50,000 volts), medium voltage (between about 1,000 volts and about 50,000 volts), or low voltage (less than about 1,000 volts). [0003] As the cables are transmitted across the grid to consumers of electricity, it is often necessary or desirable to periodically terminate the cables to make conne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/28
CPCH01B3/28H01B3/46C08K3/04C08K3/22C08K5/14C08K7/08C08K9/06C08K2003/2237H01R11/11H02G1/14H02G15/064C08L83/04C08K13/02C08K3/041F16L3/08F16L59/00
Inventor 徐鸿升石英苏崎张鸣庄猛王亚明侯静强金小林
Owner 3M INNOVATIVE PROPERTIES CO
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