DD139397A1 - METHOD FOR THE PRODUCTION OF STABILIZED DISPERSE SYSTEMS FROM FINE POWDER IN ORGANIC SUBSTANCES - Google Patents

Abstract

Process for the preparation of stable-disperse systems of fine powders in organic substances, characterized in that the surfactants used for the stabilization are adapted to the properties of the non-plastic powders.

Description

Title of the invention

Process for the preparation of stable disperse systems of fine powders in organic substances

Field of application of the invention

The invention relates to the preparation of rod-dispersed systems of fine powdery materials in organic substances

Characteristic of the known technical solutions

For the preparation of complicated moldings, sheets, films u «ä ₆ aplastic powder converted by means of organic binder zu.einer plastic mass" are * converts "Known are plastic Kerasiikmassen ₃ whose organic Biaclemittel thermoplastics are" for the production of ceramic hot gunning materials represent "= · In addition, according to WP 61980, surfactants are used. The aliphatic losacetic acid esters are used as dispersing agents for the dry grinding of minerals. One agglomeration is prevented during the dry milling, and thereby the grinding effect is increased.

Aim of the invention

The aim of the invention is a highly viscous stable-disperse system of fine powder and organic substances with the addition of surfactants (surfactants) «

Explanation of the essence of the invention

In the production of fine powders by dry grinding, the agglomeration of the fine powder particles β is the further processing of such powders. plastic masses with the addition of! thermoplastics and other organic binders does not lead to any dispersed systems. In dry grinding with the addition of surface-active substances, the catalytic effect of the fine powder and the catalytic action of the surface are due to uncontrolled degradation of the surface-active substances . Adsorbed Oxygen A uniform activation of the powder surface is for. the production of a stable-disperse system is necessary. According to the invention, this uniform activation of the surface of the powder is achieved by reducing all the factors responsible _for the degradation of the surface-active substances to a minimum

Embodiments.

Dry grinding is carried out in a ball mill at a pressure of 10 bar. After the required fineness of grinding has been reached, a surface-active substance is added to the material to be ground and the material in the ball mill is evacuated to a bridge.

The duration of activation is two hours

20860V-

and under a protective gas atmosphere at a temperature of about _o 50 ° C performed © Bas activated powder is up to pressures ~ 10 - evacuated bar ^ and processed with organic matter under heating to stable disperse systems in a viscosity range of 5 to 150 poise "

2 "A mixture of 65 parts by weight of fine powder, 55 parts by weight of alkanes and 2 parts by weight of oleic acid as surface-active substance is prepared in advance with the addition of grinding media." The milling time is two hours. "The resulting slip is centrifuged. 5 of the total organic constituents The excess liquid to surface-active substances _{8 is also present in} the excess liquid. The optimum occupancy of the powder surface is not required with this method. Optimum coating of the powder surface with surface-active substances is achieved with this process guaranteed "

Claims (2)

* - 2 invention claim 1. A process for the preparation of stable-disperse systems of fine powders in organic substances, characterized in that the surfactants used for stabilization are adapted to the properties of the plastic powders. 2 ", method according to item 1, characterized in that the surfactants have no functional group in the molecule after attachment to the powder particles, which can lead to agglomerates ₀ Process according to items 1 and 2, characterized in that the surfactants are soluble in the organic substances 4 * * Process according to item 1 to 3, characterized in that the surfactants are not destroyed during the surface activation » 5c method of item 1 to 4, characterized in ^ that it is the surfactants are saturated and unsaturated carboxylic acids having a chain length of 12-32 carbon atoms to _$ derivatives thereof. z- _o B _{0 are} fluorocarboxylic acids and the esters of saturated and unsaturated carboxylic acids and are mixtures of these substances, ¹ G 2 0 8 6 0 6. The method according to item 1 to 5 », characterized in that it" in the powders to metal powder, Zo B. molybdenum, tungsten, manganese U ₀ a., Metal oxide powder, glass powder and ceramic powder acted The method of item 4, characterized in that the activation in a vacuum, in particular at pressures ^ ^J 10 bar and at temperatures up is carried out at 150 ⁰ C " 8 _e method according to item 4-, characterized in that the activation is carried out under inert gas, z "B ₀ nitrogen, and noble gases at pressures - 20 bar, wherein the powder is evacuated before activation up to pressures Z. 10 ^ baro 9c. Process according to items 3 and 4, characterized in that the wet activation is carried out in impolar solvents, in particular in alkalis, the excess solvent and an excess of surface-active substances being subsequently removed. The powder is evacuated prior to activation to pressures Z ^ 10 bar. ". Process for the preparation of stable-disperse systems of fine powders in organic substances, characterized in that the dry milling of the pulverulent materials is carried out at pressures of -20 bar without addition of grinding aids -6- 9ύ ß A 11 _Ο Process according to point Λ to 10, characterized in that the activated powder before and during the mixing with organic substances to plastic masses to pressures> 1Cf- ⁷ bar is evacuated ·.