SU108343A1 - The method of obtaining electrically insulating mlyudinitovyh papers - Google Patents

Description

The known methods of obtaining mica-containing papers and cardboard based on crushed or ground mica waste did not find industrial use due to the imperfection of the technology, which causes large losses of the original materials and insignificant yield of finished products, and the poor quality of the electrically insulating papers produced.

The described method for producing sheet and roll electrical insulation papers and cardboard from thermochemical-treated

Mica waste is designed to ensure high quality insulation materials with low losses of raw materials and high production profitability.

Nonindustrial waste of muscovite mica, phlogopite and biotite, which are obtained during the extraction or processing of mica, as well as in the production of mica mica, subjected to thermochemical treatment, is dispersed in an aqueous medium using surface-active substances (sulfite liquor, Petrov contact) preventing aggregation of mica particles in the process of their dispersion. As a result, the sheet formation process occurs more evenly and more dense packing of micaceous particles in castings is achieved, which increases their mechanical and physicoelectric properties.

From mica processed in such a way, a sheet or a roll of 1111 material is obtained, which is variously massive, using the dewatering method on the grids of a water mica slurry.

To obtain water and heat-resistant materials, UV emulsion or a suspension of silicone or other synthetic resins or varnishes obtained by introducing emulsifiers (sulfite bees, soap, polyvinyl alcohol), or two-component aqueous resin emulsions prepared using ultrasound.

Before being introduced into the mass, the emulsion and suspension are treated with an aqueous solution of starch-melamine-formaldehyde or starch and wine-and-tin glue in a small amount (up to several percent).

To increase the mechanical strength of the material, a small amount (a few percent) of highly hydrated cellulose fiber is introduced into the composition of the water micronitinite suspension.

Forming sheet materials is carried out by the method of single-layer casting on vacuum forming machines or multilayer casting on papmachines. Drying and pressing of sheet materials is carried out on hydraulic presses, drying cylinders, or using high-frequency or infrared heating devices.

Forming roll materials is produced by the method of single-layer or multilayer casting on multi-cylinder, single or multi-grid table machines using self-shooting devices. When casting sheet and p) material materials, it is especially important to inform the grid on which the mass is cast, oscillate

using mechanical or electrical vibrators, in particular high-frequency ones. In this case, a better compaction of the material occurs and its physicomechanical and electrical properties are improved.

Subject invention

Claims (3)

1. A method of obtaining electrical insulating sanitary paper and cardboard, conditions from the processes of dispersing mica, obtaining mass and reflux of the latter, about t and ch and, in order to increase the water and heat resistance of materials in the process of dispersing mica, surface-active substances are introduced into the water-mica dinite, and in the process of pouring the mass, emulsions or suspensions of starch-melamine-formaldehyde, or starch-urea-formaldehyde, or urea-formaldehyde are introduced into the latter resins or varnishes. 2. A method for producing papers and paperboards according to claim 1, of the type that, in order to increase the mechanical strength, additives of highly hydrated cellulose fiber are introduced into the water mica slurry. 3. Method of obtaining papers and paperboards in PP. 1 and 2, distinguishing from and with that. That electric or mechanical vibrators are used for casting the mass on the vibrating net in the manufacture of sheet or roll materials.