SU474586A1 - Method for the production of paper dielectric - Google Patents

Description

This invention relates to paper dielectric production methods and is intended for use in the pulp and paper industry.

The known method of making paper dielectric, which involves treating cellulosic material with hydrogen peroxide, does not sufficiently reduce the dielectric loss tangent.

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

For this, the cellulose-containing material is additionally treated with a substance selected from the group consisting of mineral and organic acids, bases, ammonia, alcohols, isocyanates.

Additional processing can be carried out both after processing the cellulose-containing material with hydrogen peroxide, and simultaneously with the leu.

Example 1. 300 ml of paper pulp with a concentration of 2% and a grinding degree of 95.6 ° SR are diluted with 1 liter of deionized water; in the resulting suspension. enter 10 ml of 30% hydrogen peroxide. After 4 hours, 5 ml of 89% phosphoric acid was added to the mass.

Further processing of the masses prepared in this way to paper is carried out according to the generally accepted scheme.

Table 1 gives the values of the dielectric loss tangent of the dielectric, obtained in accordance with Example 1, as compared with the INITIAL cellulose and with the dielectric, obtained in accordance with the known method.

t a b c and c a 1 Values tg S

Indicators

at

at 7 7 100 С

0,0017

0,0013

Initial mass

Material treated with 0.0017 0.0011 by a known method

Material processed by the proposed SP0, 00105

.0,0014 sob

Example 2. In the mass prepared and treated with hydrogen peroxide in accordance with Example 1, 10 ml of a 35% hydrochloric acid solution are injected. Further processing of the pulp is carried out in accordance with Example 1.

Table 2 gives the values of the dielectric loss tangent of a dielectric obtained in accordance with Example 2 compared with the original pulp and with a dielectric manufactured according to a known method.

Indicators

0.0009

0,0012

Example 3. To 120 ml of paper pulp with a grinding degree of 96.1 ° SR and a concentration of 5%, add deionized water to a volume of 0.5 l. 6 ml of 30% hydrogen peroxide are introduced into the suspension obtained and after 4 hours 1.5 ml of a 89% iHoro phosphoric acid solution is added.

Table 3 shows the values of the tangent of dielectric loss angle.

T a b l II c a 3

Indicators

0.0009

0,0013

As can be seen from the above tables, the proposed method for manufacturing a paper dielectric makes it possible to reduce the dielectric loss tangent at a temperature of 120 ° C from 0.0017-0.0018 (by a known method) to 0.0012-0.0014 and at a temperature of 100 ° C from 0.0011 (according to a known method) to 0.0009-0.0010.

Subject invention

Claims (3)

1. A method for producing paper dielectric by treating cellulose-containing material with hydrogen peroxide, characterized in that, in order to reduce the dielectric loss tangent, cellulose-containing material is further treated with a substance selected from the group containing mineral and organic acids, bases, amines, alcohols, and isocyanates. 2. A method according to claim 1, characterized in that the additional treatment is carried out after treatment with hydrogen peroxide. 3. A method according to claim 1, characterized in that the additional treatment is carried out simultaneously with the treatment with hydrogen peroxide.