It is suggested that polyacrylate thickener is a new kind of functional polymer material developed rapidly in recent years. It is mainly used to improve the viscosity or consistency of products, with small dosage, obvious thickening and use

Polyacrylate thickener is a kind of new functional polymer material developed rapidly in recent years. It is mainly used to improve the viscosity or consistency of products. It has the characteristics of small dosage, obvious thickening and convenient use. It is widely used in coating, pharmaceutical, printing and dyeing, cosmetics, food additives, oil extraction, paper making, leather processing and other industries. The coating industry in China is nearly ten With the rapid development in recent years, the paint market is developing towards the direction of "health, environmental protection and green". Waterborne coatings are the main force in the whole coatings market. According to the report "analysis of economic operation and future trend of China's coating industry in 2013", China's coating production increased 4.37 times from 2.98 million tons in 2004 to 13.035 million tons in 2013. Under the influence of the macro market and industrial environment of the whole coating industry, civil coating, industrial coating and water-based coating all showed a growth trend in 2013. In recent years, it is observed that the annual growth rate of waterborne coatings in China is about 15%, and the demand for raw materials is also growing. The annual growth rate of consumption and sales of acrylic thickeners for waterborne coatings is about 15%.

The industry of polyacrylic thickener for water-based coatings in China started late, but the amount of thickener is large and the increment is larger. Although there is no report on production, consumption, output value and growth rate, polyacrylic acid thickener for coating is about 5kg / T, 55% of coatings in China are water-based coatings, and the consumption of Acrylic Acid Thickener for water-based coatings in 2013 is about 35000 tons. "In 2013, the sales volume of polyacrylic acid thickeners of Handan risda latex Technology Co., Ltd. reached 40 million yuan," Cheng Xingjie, an interview with Huicong paint raw materials network, said.

Thickener, I believe everyone heard the name is not strange, the first thing in mind is that "food" contains, other aspects are not clear. According to general assembly, "thickening agent, as a rheological aid, is widely used in food, coating, adhesives, cosmetics, detergents, printing and dyeing, rubber, medicine and other fields. In addition to considering the fluidity, transparency, consistency, gelation and suspended particle ability of the product, we should also pay attention to choosing less dosage and thickening effect. RISTA is mainly a research and development, production thickener enterprises, mainly used in coating, printing and dyeing, oil production, mineral processing, paper, leather processing and other industries. At present, the thickener accounts for about 0.8% in the paint, and the paint market uses 57000 tons in one year. At present, the thickeners used in coatings are divided into four categories: acrylate thickeners, alkali swelling thickeners, Pu thickeners, cellulose thickeners, etc. the polyacrylate thickeners with the largest amount in the market are divided into alkali swelling thickeners and associated thickeners. "

"At present, most of the synthetic thickeners in the world are acrylate copolymers, which have excellent properties and remarkable effects. According to the requirements of environmental protection and safety, emulsion polymerization is often used to synthesize acrylate thickeners. Cheng stressed.

Let's learn more about thickeners:

Polyacrylic alkali swelling thickener

It has been more than 60 years since the introduction of carbomer 934 into the market by codrich company in 1953. Because of its excellent performance and remarkable effect, it has attracted much attention. In the world, emulsion polymerization and inverse emulsion polymerization are used to prepare liquid emulsion or powder products. Because polyacrylic acid thickeners often contain carboxyl groups in the molecular structure, and for polymer emulsion, the introduction of carboxyl groups can give various properties of polymer emulsion, improve coating adhesion to substrates, etc., and have thickening effect on acrylic acid thickeners, and can give various performances of milk liquid. Therefore, many scholars at home and abroad have studied the mechanism of emulsion thickening. As early as 1959, D.B.Fordyce studied the alkali thickening of methacrylic acid acrylate methacrylate emulsion copolymerization system. Muroi and Verbruggef studied the alkali thickening of emulsion copolymerization system of ethyl acrylate acrylic acid and methyl methacrylate ethyl acrylate methacrylic acid, respectively. In 2004, Arnaud synthesized a series of amphiphilic polymers based on hydrophobic modification of N, N- two methacrylamide and acrylic acid, and found that these polymers showed obvious reversible shear induced gel phenomenon in aqueous solution. Some domestic scholars have also studied the synthesis and thickening effect of thickener. The results show that the main factors affecting the properties of thickener are the special monomer characteristics, the ratio of different monomers and the synthesis process.

Generally speaking, there are two thickening mechanisms of polyacrylic acid thickeners, namely alkali neutralization thickening (also known as alkali swelling thickening (ASE)) and association thickening (hase), which are all anionic thickeners. Non associative ASE is polyacrylic acid alkali swelling emulsion. These thickeners are mainly ASE-60 of DOW company and R-7260 of Handan City Star latex Technology Co., Ltd. Alkali neutralization thickening is to neutralize the carboxylic acid of acid polyacrylic acid thickener with alkali, make its molecule ionize and dissolve in water, make the molecule stretch and open to form a network structure to achieve thickening effect.

Associative HASE is hydrophobically modified polyacrylic acid swelling emulsion, such as Nopco company SN636 and DOW TT 935, Handan City