SU994601A1 - Composition for making electric insulation paper - Google Patents

Description

The invention relates to the pulp and paper industry and can be used in paper mills that produce electrical insulating paper.

It is known that the dielectric loss tangent (tgcA) of impregnated paper and impregnating liquid in a working capacitor can be reduced by using oxide or adsorptive paper containing active adsorbent in the composition, which is capable of absorbing moisture, cellulose degradation products and impurities from impregnating masses. Therefore, the most effective will be the sorbent, which has the greatest adsorption capacity with respect to the decomposition products of impregnating liquids, formed during the operation of capacitors. .

A known composition for the manufacture of electrically insulating paper containing a sorbent in the composition, which improves its dielectric properties and the adsorption capacity of Cl 3.

The closest in technical essence and the achieved effect is a composition for the manufacture of electrically insulating paper containing

the composition of the active sorbent, consisting of gishlini oxide and dioxide of horses, improves dielectric. 5 properties of capacitor paper, by reducing the dielectric loss tangent at 120 C 2.

However, the sorption capacity of gshyumic zirconium sorbent in relation to the impregnating liquid trichlorobiphenyl is not large enough.

The purpose of the invention is a significant increase in the sorption properties of electrically insulating paper.

and the goal is achieved in that the composition for the manufacture of electrically insulating paper containing cellulose and active sorbent on os-l. Iove of alumina and zirconium dioxide do not use an adsorbent, additionally containing magnesium oxide and boron oxide in the following ratio of components of the adsorbent, wt%: Gsuminium oxide 88-92 Cirroxide dioxide25 horses 2-3 Mg oxide 4-6 Boron oxide 2-3 In addition , composition contains May.% 1. Cellulose 95-97 Active adsorbent 3-5. The characteristics of the proposed adsorbent compared to the known are presented in Table 1. From the data given in Table. 1, it follows that the proposed multicomponent filler is superior from the value of 1.7 times in the main indicator - compatibility with TCD, which characterizes its sorption capacity. Under laboratory conditions, using the proposed filler, laboratory samples of capacitor paper with a thickness of 30 µm and a density of 0.5 g / cm were fabricated. Example 1. An adsorbent containing, in%: alumina - 90, zirconium dioxide - 2.5, magnesium oxide 5, 0, and boron oxide - 2.5 are introduced into cellulose in a ratio of 3% by weight of the adsorbent and 97% by weight. % cellulose. Samples of condenser paper are made from the resulting mass. Example 2. The adsorbent according to example 1 is introduced into the pulp in a ratio of 4 May,% of adsorbent and 96% by weight of cellulose. Samples of condenser paper are made from the resulting mass. Example 3. The adsorbent of Example 1 is introduced into the pulp in a ratio of 5.% by weight of the adsorbent and 95% by weight of cellulose. Samples of condenser paper are made from the resulting mass. The test results of the manufactured paper of the proposed composition on its dielectric properties in comparison with the known composition and paper without sorbent are presented in table 2. From tab. 2 it follows that the introduction of the proposed multicomponent filler into capacitor paper significantly improves its dielectric properties, in particular, reduces the dielectric loss tangent at 100-120 ° C. The introduction of the proposed composition into the industry allows to increase the service life of capacitors, which gives a significant economic effect. Table 1

Specific surface

Particle size, microns

Hold on cellulosic fiber, wt.%

Compatible with TCD

Original paper weight

Paper with a known adsorbent

Paper with the proposed adsorbent

250-300

250-300

1 or less 1 or less

80-8580-85

8.55

(Table 2

0,0018 0,0027

85

Claims (2)

85.2 84.0 84.7 5 99 Claim 1. Composition for the manufacture of electrically insulating paper, cellulose contents and active adsorbent based on alumina and zirconia, characterized in that, in order to increase the sorption properties of paper, the active adsorbant additionally contains magnesium oxide and boron oxide in the following ratio of components of the adsorbent, wt.%: Alumina 88-92 Zirconium dioxide 2-3 1 "Magnesium oxide 4-6 Boric oxide 2-3 2. Composition according to claim 1, as touch and and with what it contains, May.% Cellulose 95-97 Active adsorbent 3--, Sources and information received note in the examination i. USSR author's certificate 675114, cl. D 21 H 5/00, 1977. 2. USSR author's certificate 565970, cl, O 21 N 5/00, 1976 (prototype).