SU1189923A1 - Method of producing capacitor paper - Google Patents

Abstract

1. METHOD OF MANUFACTURING CONDENSING PAPER, including grinding cellulose, preparing paper pulp, emptying the paper web, pressing it, drying calendering and treating with an aqueous solution of a chemical reagent at any stage of paper making, characterized in that, in order to improve paper quality by reducing the tangent of dielectric loss angle while reducing its cost, as a chemical reagent using orthophosphoric acid .or its mixture with boron at a ratio of 1: 1. 2. The method according to claim 1, characterized in that they use 0.1-5% orthophosphoric solutions (L and boric acids.

Description

FIELD OF THE INVENTION The invention relates to the paper and paper industry, in particular to the manufacture of electrically insulating paper.

The aim of the invention is to improve paper quality by reducing the dielectric loss tangent while at the same time reducing its cost.

The essence of the invention is that according to the method of manufacturing capacitor paper, including pulp grinding, preparation, paper pulp, paper web casting, pressing, drying, calendering and treatment with an aqueous solution of a chemical reagent at any stage of paper production, orthophosphoric acid is used as a chemical reagent. or its mixture with boron at a 1: 1 ratio. Moreover, using 0.1-5% solutions of phosphoric and boric acid.

Example 1. Electroinsulating cellulose is milled, paper pulp is prepared, paper web is cast, pressed, dried, treated with 5% orthophosphoric acid solution to a bulk mass of 1.2 g / cm and calendered.

Indicators of the quality of the paper are given in table. one.

Example 2. The south of the electrically insulated cellulose is placed in a cylindrical container of a laboratory mixer and poured 1,000 MP of a 0.01% orthophosphoric acid solution. Then within half an hour make a breakdown of cellulose, pos. After this, the resulting suspension is milled in a laboratory mill until 97 is ground, for 10 hours. Then, the resulting pulp is diluted with 1000 ml of water and laboratory samples are made.

papers with a bulk weight of 0.7 g / cm as in example 1. In parallel, paper is made from paper pulp, not containing orthophosphoric acid

In tab. Figure 2 shows the tangent values of the dielectric loss angle of the paper being produced.

Example 3. Paper manufactured in example 2, only use a 0.1% solution of phosphoric acid.

In tab. Figure 3 shows the tangent values of the dielectric loss angle of the paper being produced.

Example 4. The paper is made according to example 2, only use a 2.8% solution of phosphoric acid.

In tab. Figure 4 shows the tangent values of the dielectric loss angle of the paper being produced.

Example 5. The paper is made according to example 2, only. Use a 5% solution of phosphoric acid.

In tab. Figure 5 shows the tangent values of the dielectric loss angle of the paper produced.

Example 6. The paper is made according to example 5, only use a mixture of 5% phosphoric. And 5% boric acid.

In tab. 6 shows the tangent values of the dielectric loss angle of the paper produced.

Example 7. The paper is made according to example 6, only using a mixture of 0.1% phosphoric and O, 1% boric acid.

In tab. 7 shows the dependence of the dielectric loss tangent on the processing of paper pulp with a mixture of phosphoric and boric acids.

Table 1

Thickness, micron Bulk mass, g / cm Breakdown voltage, V

10.3

1.17 600

Indicators

Number of conductive inclusions 15

Tangent of dielectric loss angle in a dry form, at a temperature, with

60

80

100

120

140

Dielectric Angle Tangent

losses during the impregnation with trichlorodiphenyl at 120 С0.43

Tangent of dielectric loss angle 0,090,080,080,09

-0.085 0.090.12

Dielectric loss tangent

Offered

Known

Initial

Continuation of table

Original paper is offered

15

0.12 0.11 0.12 0.14 0.19

0.32

table 2

at temperature, С

20 60 100 j 120

/

Table 3

at temperature, С

20 60 100 I 120

0,060,060,060,06

0.085 0.0850.10

0.085 0.090.12

Dielectric loss tangent

0.060.05 0.050.05

-0.07 0.070.07

-0.085 0.090.12

Dielectric loss tangent

0.030 0.035 0.035 0.035 - 0.040 0.040 0.040

- 0.085 0.09 0.12 i

Dielectric loss tangent

Borna acid

Phosphoric acid

A mixture of boric and orthophosphoric acids in a ratio of 1: 1

Table 4

at temperature, С

20 T 60 I 100 I 120.

..

Table5

at a temperature of

20 60 100 I 120

Table 6

at a temperature,

60 100 I 120

0.040 0.040. 0.040 0.030 0.035 0.035

0.030 0.030 0.030

Borna acid

Phosphoric acid ta

A mixture of boric and orthophosphoric acids in a ratio of 1: 1

Table 7

0.085

.0,10 0.06 0.06

0.05

0.05

Claims (2)

1. METHOD FOR PRODUCING CONDENSER PAPER, including pulp grinding, paper pulp preparation, paper web casting, pressing, drying, calendering and treatment with an aqueous solution of a chemical reagent at any stage of paper production, characterized in that, in order to improve the quality of paper by reducing the dielectric loss tangent while reducing its cost, use phosphoric acid or its mixture with boric acid as a chemical reagent at a ratio of 1: 1. 2. The method according to claim 1, characterized in that 0.1-5% solutions of phosphoric and boric acids are used. SU „„ 1189923 1 1189923