How to make polycarboxylate superplasticizer has antisepsis performance?
Keywords
Polycarboxylate superplasticizer, antisepsis, anti-mildew
Under high temperature and high humidity conditions in summer, polycarboxylate superplasticizer is prone to mildew after being compounded with retarder sodium gluconate; the original light yellow transparent liquid turns into black viscous liquid after mildew. Since polycarboxylic acid is mainly composed of macromolecular chains, under high temperature, high humidity, and no ventilation conditions, it is easy to cause the decomposition of macromonomers, resulting in the deterioration of the performance of polycarboxylic acid; under extreme conditions, if polycarboxylate superplasticizer appears, Mildew will have a serious impact on its quality and lead to concrete accidents. Therefore, in summer or in high temperature and high humidity environment, how to make polycarboxylate superplasticizer have anti-corrosion performance is very important.
At present, the main ways to prevent mildew of polycarboxylate superplasticizers are as follows:
1. Select high-quality sodium gluconate as a retarder compound, mainly to control the residual amount of Aspergillus niger in sodium gluconate;
2. Compounding a certain amount of industrial preservatives can effectively prevent mildew of polycarboxylate superplasticizers. The types of preservatives are as follows: sodium nitrite, sodium benzoate, isothiazolinone, sodium tripolyphosphate, etc.
