SU485188A1 - Method of making paper dielectric - Google Patents

Description

(54) METHOD OF MANUFACTURING PAPER DIELECTRICS

one

This invention relates to a process for making paper dielectric and is intended for use in the pulp and paper industry.

There is a known method of making paper dielectric by treating paper pulp and then casting the web.

The aim of the invention is to improve the dielectric properties of the paper dielectric.

This is achieved in that the cellulosic material is treated with lactose. The lactose solution is introduced directly into the pulp before reflux, and the lactose concentration in the pulp is 0.001-1% - (mostly 0.02%) at pH 5-6 (mostly 5.65). The effect obtained by treating the material with lactose can be improved if the material is pretreated with magnesium sulfate. It is introduced directly into the pulp, P1; 5 to reduce consumption and reduce wastewater contamination with magnesium sulfate.

in the form of folders. The concentration of magnesium sulphate in the material treatment solution is 2-6%, (preferably 5%) at pH 4-6 (advantage of 5.65). Treatment of the material with magnesium sulfate and lactose provides effective displacement of monovalent ionic impurities and reduction of sodium content in the finished paper. nom dielectric to a value of 2-5 mg 1 kg dielectric, which significantly improves its properties.

Example 1

Cellulose brand EI-1 is dissolved in demineralized water.

Magnesium sulfate is added to the aqueous suspension of cellulose to a mass concentration of 5 wt. % and lactose to a mass concentration of 0.02 weight. % Castings are made on a laboratory leaf-making apparatus.

PRI me R 2.

400 ml of paper pulp with a concentration of 1-5% and a grind degree of 95.6 ° SR are diluted with 1.5 l of 5% magnesium sulfate solution and mixed thoroughly.

I Maqca stand for 1 hour, then enter 0.6 g of lactose as a solution and mix thoroughly. After 30 minutes of casting the mass, castings are prepared on a grain-free sheet mill.

; A significant increase in the breakdown voltage and a decrease in the dielectric loss tangent of almost two times indicates a significant improvement

dielectric properties of paper. It should be noted that the introduction of lactose and sulfa

This magnesium has a positive effect on other indicators of paper (mechanical strength, breathability, sodium content).

Table B shows the tanns of the dielectric loss of paper dielectrics made in accordance with the invention and paper made by a known method.

The subject of the invention. A method of manufacturing paper dielectric by treating paper pulp with magnesium sulfate and the subsequent low casting of the web, in order to improve the dielectric properties of paper dielectric, the paper pulp is treated with 0% magnesium sulfate. , 01-10% by weight of absolute dry fiber with a pH of 4-6 mass, and then it is further treated with lactose in the amount of 0, ОО1-1% by weight of absolute dry. the fibers.