Carbo is a very large acrylic polymer. Therefore, the ultra-large molecular weight and internal cross-linking polymerization form polyacrylic acid molecules with diameters in the micrometer range. After being neutralized in water, polyacrylic acid turns into a sodium salt, which repels each other internally, and the entire molecular skeleton unfolds. The carbonyl group in it acts as a hydrogen bond and firmly holds water. Then it turns into small jelly-like microgels. These little jellies pile together, giving the entire solution a thick consistency and texture. So in cosmetics, we call carbomer and similar ingredients “thickeners.”
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