Device and method for inducing orientation arrangement of montmorillonoid in polyethylene by using electric field

A technology of electric field induction and orientation alignment, applied in the direction of circuits, electrical components, insulators, etc., to achieve the effect of firm device structure, simple device, and guaranteed safety

Active Publication Date: 2012-12-19
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the montmorillonite is randomly arranged in the polyethylene matrix, and the above "blocking" effects cannot be optimal, so there is still room for improvement in this regard

Method used

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  • Device and method for inducing orientation arrangement of montmorillonoid in polyethylene by using electric field
  • Device and method for inducing orientation arrangement of montmorillonoid in polyethylene by using electric field
  • Device and method for inducing orientation arrangement of montmorillonoid in polyethylene by using electric field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Include the following steps:

[0057] Step 1: Prepare the sample container: take a granular polyethylene / montmorillonite composite material with a montmorillonite content of 1% as a sample, place it in the through hole, cover the upper and lower sides with a layer of polyester film, and place it on a flat vulcanizer Heat pressing for 30 minutes at a molding temperature of 150°C. The thickness of the sample cavity 15 is 0.5 mm, and the thickness of the sample after hot pressing is 0.75 mm;

[0058] Step 2: Install the sample and wire: After pressing, attach a layer of epoxy glass fiber board to the surface of the upper and lower polyester films, and then put the sample holder between the upper electrode and the lower electrode; operation assistance Press the mechanism so that the upper electrode, the lower electrode, the epoxy glass fiber board, the polyester film and the sample are in close contact; at this time, put the integrated orientation arrangement device into t...

Embodiment 2

[0064] The difference from Example 1 is that if the electrical dendrite induction test is to be performed on the sample after electric field-induced orientation, in order to facilitate the later insertion of a needle electrode with a diameter of 4 mm in the sample, an iron plate with a thickness of 20 mm is used to make the sample Cavity, the thickness of the sample after hot pressing is 23mm. Parameter selection for other operations:

[0065] In step 1, hot press for 10 minutes at a molding temperature of 180° C. on a flat vulcanizer;

[0066] In step 3, adjust the temperature of the aging box to 250°C and keep it for 10 minutes, so that the sample 16 reaches a molten state;

[0067] In step 4, keep the heating temperature constant, and apply a power frequency AC electric field with a strength of 20kV / mm to the sample through the voltage application device for 10 minutes.

Embodiment 3

[0069] In order to obtain different electric tree inhibition effects, the addition amount of montmorillonite was changed to 3%. At this time, the content of montmorillonite increases, the viscosity of polyethylene / montmorillonite composite increases, and the viscous resistance of montmorillonite in the process of electric field induced orientation increases. In order to keep the effect of the orientation of the montmorillonite induced by the electric field unchanged, the heating temperature was increased to 200°C and 250°C in order to reduce the viscosity of the composite material and make the orientation of the montmorillonite reverse smoothly. Parameter selection for other operations:

[0070] In step 1, hot press for 22 minutes at a molding temperature of 155° C. on a flat vulcanizer;

[0071] In step 3, adjust the temperature of the aging box to 220°C and keep it for 15 minutes to make the sample reach a molten state;

[0072] In step 4, keep the heating temperature cons...

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Abstract

The invention discloses a device for inducing orientation arrangement of montmorillonoid in polyethylene by using an electric field. The device comprises an upper electrode and a lower electrode, wherein the upper electrode and the lower electrode are oppositely arranged, a uniform electric field space is formed between the upper electrode and the lower electrode after electrified, the uniform electric field space is internally used for placing a sample container, and a high-voltage access end and a ground terminal are respectively arranged on the upper electrode and the lower electrode. Based on the inducing orientation device, the invention also provides a system and a method. A power frequency alternating current power supply ensures that the montmorillonoid in a low polyethylene/montmorillonoid composite material under a molten state is in orientation arrangement along the direction parallel to the electric field. For an electrical tree growing vertical to the direction vertical to the induction electrical field, the method has the advantages of capabilities of increasing initiation starting voltage of the electrical tree, reducing initiation rate of the electrical tree, delaying the growth speed of the electrical tree, and reducing the growth length of the electrical tree, simple process, lower cost, and economy.

Description

technical field [0001] The invention belongs to the technical field of modification of polymer insulating materials for electrical equipment, and specifically relates to a device for dispersing orientation of montmorillonite in electric equipment in polyethylene insulating materials, and also relates to a device for inducing montmorillonite in electrical equipment Systems and methods for alignment in polyethylene. Background technique [0002] Under the long-term action of high electric field in the polymer insulating material of electrical equipment, the internal defects can easily cause partial discharge, and lead to the generation and development of electric tree. Dendritic aging is an electrical aging phenomenon that occurs in polymers and is named for the shape of the discharge-damaged channels, which are similar to tree branches. The development of aging channels of electric dendrites will reduce the insulation performance of materials, eventually leading to insulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B19/00C08L23/06C08K3/34
Inventor 杨丽君廖瑞金顾佳柏舸李剑徐积全李萧
Owner CHONGQING UNIV
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