SU1625885A1 - Method for preparing suspension of pigments - Google Patents

Abstract

This invention relates to a process for the preparation of a suspension of inorganic pigments used in lacs; , for example, in the production of c. / magicians. The method of producing organo pigment suspensions includes (the preparation of aqueous suspensions of pigments and pigments directly after the hydroclassification stage in the process of their preparation and the stabilization of suspensions with water-soluble oligomers - products of polycondensation with formaldehyde containing manorium and your body). respectively, in the amount of 0.5–1.5 wt.% relative to the dry pigment, while aqueous suspensions are prepared on the basis of titanium dioxide and iron oxide The fluidity of the suspension with a concentration of 800-900 g / l of solid is 1.5-1.7 Pa. 2 Cp f-crystals, table 2 "60

Description

The invention relates to the preparation of inorganic pigments, and for the preparation of paint and varnish compositions and can be used

 in the paint and pulp and paper industry1, for example, in paper production.

The aim of the invention is to increase the flowability of suspensions of inorganic pigments with a content of 800 to 900 g / l of solid and to facilitate their dispersibility in a water-cellulosic medium.

Example. Stabilized, titanium white suspension suspensions are prepared.

red, black and yellow iron oxide pigments from pastes obtained in the production of pigments after the hydroclassification stage and pressing water to a water-solid ratio of 1: 1. by adding water-soluble oligomers in an amount of from 0.5 to 1.5 wt.%. dry pigment according to the table.1. At the same time, oligomers with a functional amino or sulfo group are used to stabilize titanium white and oligomers with a hydroxo or sulfo group for iron oxide pigments.

The residue on the 0063 micron sieve is determined by the standard, and the flow indicators are determined on a rotational viscometer.

Od

Yu

SP

00 00

ate

Then mix the suspension and get a composition having the following composition, wt.% Dry matter: titanium white (titanium dioxide) 44; red, yellow, and black iron oxide pigments 8.8, 44, and 3.2, respectively.

The flowability of the composition is separated from these suspensions by dynamic shear stress (DPS).

Table 1 presents data on DNS for stabilized suspensions of component pigments and compositions of these suspensions for different types of oligomers, depending on their concentration.

For comparison with the data in Table 1, suspensions of the corresponding pigments, not stabilized by oligomers, at a concentration of 800-900 g / l, are a pasty consistency, having a DNS of 78-110 Pa. It is not possible to use pumping equipment for such pastes. When the known suspensions of sodium trisodium phosphate phosphate pigments are stabilized, the DNS of the composition of suspensions consisting of titanium dioxide and yellow, red and black iron oxide pigments is of the order of 41 Pa.

Table 2 presents data dks-

 analysis by the method of sedimentation in the field of centrifugal forces, the proposed suspension of pigments in comparison with the known and suspension

pigments previously oligomers untreated (unstabilized suspensions).

Claims (3)

1. A method for producing suspensions of inorganic pigments, including preparing pigments followed by wet grinding and classification, stabilizing aqueous suspensions of pigments with surfactants and then mixing them, characterized in that, in order to increase the flowability of compositions with a content of 800-900 g / l solid, aqueous suspensions of pigments are prepared from aqueous pastes immediately after the hydroclassification stage and they are stabilized with water-soluble oligomers 2. Method pop.1, about tlich and t y and and the fact that as water-soluble oligomers use the products of polycondensation of aromatic or heterocyclic compounds with formaldehyde, containing sulfo- and hydroxo- or amino groups, respectively. in the amount of 0.5-1.5 wt.% relative to the dry pigment. 3. A method according to claim 2, in which aqueous suspensions are prepared on the basis of titanium dioxide and iron oxide pigments. I, Table 1 Titanium whitewash 0.3 0.4 0.5 1, 0 1.5 2.0 0.3 0.4 BY 14.1 12.1 10.1 5.8 5.2 5.2 13.8 6.2 Red iron oxide "I Yellow zinc oxide .. Black iron oxide and it The composition has a composition of dry pigments, wt.%: white 44 red 8.8 black 44 Continued table. Continuation of table