Synthesis And Properties Of Polyacrylic Acid Thickener

Polyacrylic thickener has developed more than 60 years, different types of polyacrylic acid is widely used in cosmetic, pharmaceutical, food, printing, coating and other fields. With advances in synthesis technology, the type of polyacrylic acid thickener has become more and more, Polyacrylic acid thickener of our research is a kind of polyacrylic acid resin with a certain degree of crosslinking, the main reactant is an acrylic monomer, co-monomer, allyl ether crosslinkers, initiators. The resins are used in cosmetic and pharmaceutical fields. In other countries, the trade name is called Carbomer, Carbopol or Carboxypolymethylene, and in our country, the trade name is called Kaposi resin or carbomer resins, which have innocuity, high efficiency, stability, suspension, anti-corrosion, electrolyte resistance and excellent rheological performance, it is widely used in the fields of cosmetics, pharmaceutical agents and the like. The PAA is used in cosmetics and pharmaceutical agents. It was contained for 58 years in pharmacopoeia of Britain and the United States, but the time is 15 years in China. In other countries, the resin production technology is strictly confidential. In the domestic, we know little about the resin’s formulations, synthesis methods, production process. Our research focuses on the performance of foreign products. Currently, the company of the products is small and very young in China. Compared with foreign products, the competitiveness of the product needs to be improved. The number of potential consumers is increasing in our country. With the growth of cosmetic consumption, the demand for the product is very great in auxiliary materials applications. Therefore, the research of the polyacrylic acid resin has very important significance.The synthetic method is precipitation polymerization. The method of removing the polymerization inhibitor is usually vacuum distillation. But the vacuum distillation will have a huge cost pressures (company production equipment, production technology costs), it is difficult to carry out large-scale industrial production. Commercially available acrylic acid can be directly reacted and accelerate the reaction rate in the addition of a salt accelerator. Resistant electrolyte thickener applications become more widespread. We usually added to the long chain hydrophobic comonomer to improve electrolyte resistance of the products. Thus we were respectively added to ODA and BEM comonomer. The results showed that:commercially available monomers can be directly reacted and accelerate the polymerization reaction rate after the addition of salt accelerator. When the comonomer is BEM, electrolyte resistance becomes better. We investigated the relations between thickening ability and clarity performance. The single factor and orthogonal experiments were applied. Conclusions showed that we obtain a high performance of PAA with the propotion of monomer 11%, cross-linking agent 0.7%(by the weight of monomer), initiator 0.5%(by the weight of monomer), comonomer 1.2%(by the weight of monomer), dispersing agent 0.6%(by the weight of monomer), salt accelerator 0.6%(by the weight of monomer) and the reaction time is 3-4h. The viscosity of the product was 72.7Pa.s, the clarity was 91.3%.