Anti foam agent 99%

Antifoaming agent refers to a substance that can reduce the surface tension of water, solution, suspension, etc., prevent the formation of foam, or reduce or eliminate the original foam. In the papermaking process, due to unreasonable sizing, poorly cleaned pulp, the use of alkaline fillers in the acid system, and the addition of various additives, etc., foam will accumulate in the papermaking wet end system, resulting in the formation of foam point curtains on the paper being copied out. . According to specific conditions, various defoamers can be added in the paper production process. The antifoaming agents used early include hydrocarbon oils such as kerosene and paraffin oil, sulfonated oils, sodium oleate, octanol, etc. Recently, effective components of widely used defoamers include silicones, polyether surfactants, and fatty amide surfactants. Antifoaming agents can be divided into oil-based and water-based defoaming agents. The effective active components are generally the same. The advantage of water-based defoaming agents is that it has little effect on other additives and will not The accumulation that occurs in the circulation avoids the occurrence of resin obstacles, and thus becomes the direction of development. Defoamers can weaken the stability of mineralized foam, thereby eliminating the harmful effects of too much foam on the sorting effect and foam transport. Some inorganic salts and higher fatty alcohols or higher fatty acids, esters, hydrocarbons have defoaming effect. The defoaming mechanism of antifoaming agents is not clear enough. Therefore, the choice of defoamer is mostly based on the nature of the foam solution and the test effect. The effectiveness of anti-foaming agents is often targeted. Foams with different characteristics must use certain types of agents to be effective. Most defoamers are insoluble in water, and most are used in the form of emulsifiers. Commonly used defoamers are: activated carbon, hydrophobic quartz powder, aluminum silicate powder, water glass, sodium tripolyphosphate, sodium hexametaphosphate, organosiloxane, dimethyl siloxane polymer, vegetable oil, animal oil, Castor oil, 2-ethylhexanol, diisobutylmethanol, fatty acid metal soap, fatty acid ester (eg Spans, Span), alkyl lactate, sulfonated tall oil, sulfonated oil, polyamides, Polyethers, polyalkylene oxide polymers, polypropylene oxide polyamines, carboxylic acid-N-alkylamides, polybutene defoamers, high molecular weight polyethylene glycols, etc.