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Multilayer structure useful for electrical insulation

A multi-layer structure and additional layer technology, applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve problems such as uneven adhesion of paper materials

Inactive Publication Date: 2014-07-09
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymer binders can cause inhomogeneity and sticking problems in the paper during paper processing and during its use in contact with transformer coils when operating at high temperatures

Method used

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  • Multilayer structure useful for electrical insulation
  • Multilayer structure useful for electrical insulation

Examples

Experimental program
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Effect test

example 1 and 2

[0048] A two-layer structure according to the invention was prepared in a similar manner to Comparative Example A, except that one cellulose layer was replaced by a polyester / cellulose layer. The polyester / cellulose layer was prepared in a manner similar to that used to prepare the cellulose layer, except that a portion of the cellulose was replaced with 6 mm (1 / 4 inch) polyester floe. The polyester floc was spun from poly(cyclohexanedimethanol terephthalate) (PCT, available from Eastman Inc.) and poly(trimethylene terephthalate) ( PTT, made from melt-spun fibers of melt blends available from E.I. du Pont de Nemours and Co., Wilmington, Delaware). The final compositions are listed in Table 1. The properties of the resulting two-layer structures are listed in Table 1.

[0049] Table 1

[0050] Two-level structure and properties

[0051]

[0052] Table 1 shows that Examples 1 and 2 show a slight improvement in tensile strength retention.

example 3-5

[0058] The monolayer structure of the first layer of the multilayer structure according to the present invention was prepared in a similar manner to Comparative Example C, except that part of the cellulose was replaced with 6 mm (1 / 4 inch) polyester floe. The polyester floc was spun from poly(cyclohexanedimethanol terephthalate) (PCT, available from Eastman Inc.) and poly(trimethylene terephthalate) ( PTT, available from melt spun fibers of melt blends from E.I. du Pont de Nemours and Co., Wilmington, Delaware). The final compositions are listed in Table 2. The properties of the resulting monolayer structures are listed in Table 2.

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Abstract

The present invention is directed to a multilayer structure comprising: (a) a first layer containing polyester and cellulose wherein (i) the polyester is present in an amount of 0 to 50 weight percent floc and 50 to 100 weight percent fibrid, (ii) the cellulose is present in the form of cellulosic pulp fiber and; (iii) the polyester is present in an amount of 0.5 to 75 weight percent and the cellulose is present in an amount of 25 to 99 weight percent, said percentages on the basis of the polyester and cellulose and; (b) a second layer containing cellulosic pulp fiber with the proviso that the second layer does not contain polyester. The first layer may further comprise an aramid. The multilayer structure is particularly useful in a transformer.

Description

technical field [0001] The invention relates to a multilayer structure suitable for electrical insulation. Background technique [0002] Kraft paper made from cellulose pulp is widely used as a solid electrical insulator in oil-immersed transformers due to its good insulating properties and its economy. However, the cellulosic polymer is prone to hydrolysis due to prolonged exposure to high temperature. Thermal stability and mechanical strength can be improved by blending high temperature synthetic fibers with cellulose pulp. A polymeric binder is added to facilitate the bond between the synthetic fibers and the cellulosic pulp. However, polymeric binders can cause inhomogeneity and sticking problems in the paper during paper processing and during its use in contact with transformer coils when operating at high temperatures. [0003] It would therefore be desirable to produce a paper for electrical insulation having improved thermal stability and mechanical strength while...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/22B32B5/26H01B3/18H01B3/42H01F27/32B32B5/02
CPCD21H13/24D21H13/26D21H27/30H01B3/185H01B3/421H01F27/32Y10T428/3179B32B27/10B32B29/005
Inventor B.S.康G.芬伊维斯S.雷鲍伊拉特
Owner EI DU PONT DE NEMOURS & CO
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