反应详情

温度

30 °C

By continuously mixing water, 50% by weight sodium hydroxide solution and acrylic acid, a 38.8% by weight acrylic acid/sodium acrylate solution was prepared such that the degree of neutralization was 69.0 mol %. After the components had been mixed, the monomer solution was cooled continuously to a temperature of 30° C. by means of a heat exchanger and degassed with nitrogen. The polyethylenically unsaturated crosslinker used was 3-tuply ethoxylated glyceryl triacrylate (purity approx. 85% by weight). The amount used, based on the acrylic acid used, was 0.35% by weight. To initiate the free-radical polymerization, the following components were used: hydrogen peroxide (0.002% by weight of a 2.5% by weight aqueous solution), sodium peroxodisulfate (0.1% by weight of a 15% by weight aqueous solution), and ascorbic acid (0.01% by weight of a 0.5% by weight aqueous solution). The percentages by weight are based in turn on the acrylic acid used. The throughput of the monomer solution was 500 kg/h.

1. additionAfter the components had been mixed
2. customdegassed with nitrogen
3. customthe free-radical polymerization