Dry composite foams as electrically insulating materials

A technology of electrical insulating materials and composite foams, which is applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., and can solve problems such as unrealizable and low density

Pending Publication Date: 2022-05-20
MASCHFAB REINHAUSEN GEBR SCHEUBECK GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of these syntactic foams, due to the high mixing viscosity, only a degree of filling of microhollow spheres up to 50% by volume can be achieved, so that even lower densities cannot be achieved

Method used

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  • Dry composite foams as electrically insulating materials
  • Dry composite foams as electrically insulating materials
  • Dry composite foams as electrically insulating materials

Examples

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Effect test

example 1

[0078] This example involves the manufacture of dry syntactic foam in an expansion mold.

[0079] Depend on 551 DET 40 d25 expanded micro hollow spheres (34.7% by volume; bulk density 0.0125g / cm 3 )and 551 DU 40 type unexpanded micro hollow spheres (65.4% by volume; bulk density 0.5543g / cm 3 ) composed of 0.2g / cm 3 The mixture of bulk density is expanded at a temperature of 120° C. for a duration of 2 hours in a cylindrical expansion mold made of aluminum with an inner coating of PTFE.

[0080] Furthermore, in the expansion mold, two spherical electrodes each having a diameter of 12 mm were arranged at a distance of 1 mm. In order to ensure that this distance of 1 mm is maintained even after the expansion has been carried out, the electrodes are fixed in place by means of suitable spacers.

[0081] After expansion to construct the dry syntactic foam in the expansion mold, by using the figure 2 A circuit for breakdown voltage measurement to determine electrical breakdo...

example 2

[0086] This example involves the fabrication of dry syntactic foam directly in the insulation.

[0087] Depend on 551 DET 40 d25 expanded micro hollow spheres (83.9% by volume; bulk density 0.0125g / cm 3 )and 551 DU 40 type of unexpanded micro hollow spheres (16.1% by volume; bulk density 0.5543g / cm 3 ) composed of 0.1g / cm 3 The mixture of bulk densities is expanded at a temperature of 120° C. directly in a cylindrical or annular insulator made of glass fiber reinforced polymer with an inner diameter of 120 mm and a height of 20 mm for a duration of 2 hours.

[0088] During the expansion, the cylinder is closed at each end with a PTFE plate.

[0089] image 3 A photographic image of the unfilled insulation is shown on the left and a photographic image of the insulation filled with dry composite foam is shown on the right.

[0090] After foaming, the cylindrical insulator was not deformed. This indicates that the expansion pressure is below a critical value that could l...

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Abstract

The present invention relates to an insulation device comprising an insulator having a chamber and an electrically insulating material in the chamber wherein the electrically insulating material comprises a dry composite foam. The invention also relates to a method of using the dry composite foam as an electrically insulating material and for manufacturing an electrically insulating device, comprising (a) providing an insulator having a chamber, (b1) either provides a mixture of at least polymer-based thermally expandable microhollow spheres in an expanded state and polymer-based thermally expandable microhollow spheres in an unexpanded state, (b2) either provides a mixture of at least two types of polymer-based thermally expandable microhollow spheres in an unexpanded state, the at least two types of thermally expandable microhollow spheres have different temperature ranges of expansion, and (c) foaming the mixture consisting of the thermally expandable microhollow spheres by heat treatment at a temperature in the range between 50 DEG C and 200 DEG C to form a dry composite foam as an electrically insulating material, the cavity of the insulating body is either filled with a mixture of thermally expandable micro-hollow spheres and foamed there, or the cavity of the insulating body is filled with the dry composite foam obtained by first foaming the mixture of thermally expandable micro-hollow spheres and the cavity of the insulating body is filled with the mixture of thermally expandable micro-hollow spheres.

Description

technical field [0001] The invention relates to an insulating device comprising an insulating body having a chamber and an electrically insulating material in the chamber, wherein the electrically insulating material comprises dry composite foam. The present invention also relates to the use of dry syntactic foam as an electrical insulation material and to a method for the manufacture of electrical insulation devices comprising (a) providing an insulator having a cavity, (b1) either providing a polymer-based thermally expandable material formed at least in an expanded state. A mixture of microhollow spheres and polymer-based thermally expandable microhollow spheres in an unexpanded state, (b2) either provides at least two types of polymer-based thermally expandable microhollow spheres in an unexpanded state A mixture of these at least two types of thermally expandable hollow microspheres having different temperature ranges of expansion, and (c) by heat treatment at a temperatu...

Claims

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Application Information

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IPC IPC(8): C08J9/32C08J9/00H01B3/30H01B17/00H01B19/00
CPCC08J9/32C08J9/0061H01B3/30H01B17/00H01B19/00C08J9/232C08J2203/22H01B17/56
Inventor J·塞弗特D·马切蒂S·舒曼M·本迪格
Owner MASCHFAB REINHAUSEN GEBR SCHEUBECK GMBH & CO KG
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