Defoamer for papermaking, treating pulp foam with ease
The "black liquor" from pulp and paper production has always been considered a huge source of pollution in the paper industry. Lignin is not only the main component of the "black liquor", but also the "binder" that makes up the biomass cell wall material. According to statistics, about 5,000 tons of lignin are discharged into water bodies with the "black liquor" every year.
Paper mills in the pulping process, the surface tension of the saponification produced is less than the surface tension of the black liquor due to cooking materials, so that it exists in the black liquor surface layer to form a thin film, in the air under the effect of mixing the formation of foam. Especially when the lower the concentration of the black liquor the more foam, in the cooking of harder pulp raw materials, but also easy to produce a large number of foam, to the next operation process brings great inconvenience.
So many paper mills will use chemical interface defoamer, is the use of the defoamer for papermaking, can effectively reduce the surface tension of the black liquor, improve the concentration of black liquor, so as to eliminate foam and suppress the appearance of foam. Black liquor contains a high concentration of fatty acid soap, resin acid soap and other foaming and stabilizing substances, black liquor concentration, high temperature, high alkalinity, so the need to add alkali resistance, high temperature resistance, and has a good stability of the defoamer for papermaking.
Defoamer for papermaking has the characteristics of rapid defoaming and lasting foam inhibition under high temperature and strong alkali conditions. As papemaking defoamer in high temperature and strong alkali conditions still has excellent defoaming, foam inhibition performance; so defoamer for papermaking is particularly suitable for paper industry pulp washing section foam control; papermaking pulp defoamer has good emulsion stability, and the use of defoamer for pulp and paper is low, not easy to equipment and mesh adhesion, improve the operating efficiency of equipment and product sizing rate and washing degree, greatly saving the pulp enterprise's production costs and energy consumption. Therefore, there is a high-quality papermaking pulp defoamer, which can easily remove foam.
