High solids pcc with copolymeric additive
A technology of copolymers and formulations, applied in chemical instruments and methods, inorganic chemistry, fibrous fillers, etc., can solve the problems of non-existence and non-precipitation of calcium carbonate
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[0312] Polymerization by mixing water with dry sodium citrate (NaCi) as a digestive additive (if present) and copolymer P1 (if present) (according to the invention) or polymerisation at an initial temperature of 40-41° C. Milk of lime was prepared from Substance P2 (comparative) (the amounts of digestive additives and copolymers or polymers are shown in Table 1 below). Subsequently, calcium oxide (quicklime raw material from Golling, Austria) was added. The resulting mixture was stirred for 25 minutes and then sieved through a 200 μm sieve.
[0313] The resulting milk of lime was transferred to a stainless steel reactor where it was cooled to 50°C. Subsequently, by introducing air / CO 2 Mixture (26% volume CO 2 , at a rate of 23 L / min) to carbonate milk of lime. During the carbonation step, the reaction mixture was stirred at 1400 rpm. Reaction kinetics were monitored by online pH and conductivity measurements.
[0314]
[0315] Table 1: Properties of the prepared milk...
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