SU565970A1 - Composition for making electrically insulating paper - Google Patents

Description

(54) COMPOSITION FOR THE MANUFACTURE OF ELECTRICAL INSULATION PAPER

; . one . .

The invention relates to the cellulose-paper industry and concerns the composition FOR the production of electrically insulating paper, which can be used in paper mills producing

condenser paper, cable paper, and also electrical insulating cardboard.

The development of power capacitor construction and the use of new types of impregnating

the masses necessitated the creation of capacitor paper with low dielectric losses. It is possible to reduce the dielectric losses during the operation of capacitors by using the so-called 4-nd layer of paper containing an active sorbent in the composition, which is capable of absorbing moisture, decomposition products of dellulose and other impurities. Consequently, the most effective will be the sorbent, the introduction of which into paper contributes to the greatest reduction in dielectric losses.

A known composition for the manufacture of electrically insulating paper containing a mixture of magnesia and alumina as the active sorbent.

Also known is a composition for the manufacture of electrically insulating paper containing an active sorbent in the composition, consisting of boron oxide and lumia oxide, which improves the dielectric properties of the capacitor paper by reducing the dielectric loss angle at 12 ° C by 2.5 times.

The purpose of the invention is to reduce the tangent of dielectric loss of paper.

This goal is achieved in the composition of the paper composition of the adsorbent, consisting of 97-99 weight. % oxide of aluminum and 1.3 weight. The% zirconium dioxide, which has a high specific surface area (25 O-300 M / g) and a particle size of less than 1 micron, is well retained on cellulose fiber (g, 2 -85%) reduces the dielectric loss tangent of the paper when heated its up to 120 ° C in 4. times compared to the original tc3d ..

The characteristics of the adsorbent in comparison with the known are given in table. one.

Specific surface, MVr

Dispersibility, micron

Hold on delocal fiber,%

Reduction of t "U prn 120s compared to paper without sorbent, times

Example 1. An adsorbent consisting of 13 1-3% 2g02 and 97-99% Ar20z by mixing dt with cellulose in a ratio of 3 wt. % adsorbent 97% weight,% cellulose. Samples of condenser paper are made from the resulting mass.

Example 2. The adsorbent according to example 1 is mixed with cellulose in SORTNOTOSH1NB 4 weight. % adsorbent and 96 weight. % cellulose. Condenser paper samples were poured from the resulting mass.

Original paper weight

Paper with AP-jO

Paper with boral nium adsorbent (known)

Paper with the proposed adsorbent

Also

Table 1

250-300

18O-210 1 micron and less than 1 micron and less

82-85

8О-83,5

2.5

PR and measures 3. The adsorbent of example 1 is mixed with cellulose in a ratio of 5 weight. % adsorbent and 95 wt. % of pulp

Samples of condenser paper are made from the resulting mass.

The test results of the manufactured paper of the proposed composition for its dielectric properties in comparison with the known compositions and paper without sorbent are presented in Table. 2

table 2

0, O019

0, ОО37

0,0011

0,0018

72

0,0012

0,0010

83.2

0.0009

0.0007

83.7

84.1

0, GS 08

0.0009

85.2

O.OOO8

Claims (2)

O.OOO9 Ia of the feedstocks in the table below indicates that the proposed alumina sorbent (igc T 0.0009) is more effective than the well-known (aluminum oxide (tgcJ 0.0018) and boralumyushchy (1 (Y 0, OO12). Implementation In the industry of this composition will significantly increase the service life of capacitors, which will give a great economic effect. Claim 1. The composition for the manufacture of electrically insulating paper containing cellulose and an active adsorbent, because of in order to reduce the tangent of the angle of the dielectric paper loss, as active adsorbate} 1 tl CDC-, tav contains mixed oxide (1 lk.1mo1pc) konium adsorbent, consisting of 97-99 pes. of alumina and 1-3 wt.% zirconium dioxide. 2. The composition according to claim. 1, I distinguish it by the fact that it contains the specified components in the following weight ratio. %: cellulose 95-97 and alumircolic adsorbent 3-5. . Sources of information, accepted in public opinion at the examination :. 1. Author's certificate number 329270, M. kl.1) 21 H 3/66, 1972. 2. Authors certificate №, M. Cl. D 21 H 3/66, 1974.