Preparation And Properties Of Water-Soluble Polymer Dispersant

Ultrafine powder such as Barium sulfate and titanium dioxide are widely used in many fields due to its excellent performance in terms of thermal, magnetic, optical absorption activity, etc. As the ultrafine powder’s high specific surface area, high surface energy characteristics and thermodynamic instability, prone to aggregation, which has seriously hindered the wide use of ultrafine powder. At present, the problems to be solved for production and application of ultrafine powder are uniformity of size distribution and dispersion of powder.Now, water soluble products of coating have a rapid development, which thanks to the limitations of coating composition on organic solvent. While, it’s difficult for ultrafine powder to achieve a complete dispersion in the water environment. Because of the structural limitations, the traditional dispersants and ordinary homopolymer dispersants are unable to get ideal dispersion and stability of the products. We has prepared three kinds of polymer dispersants through copolymerization, and studied those dispersion properties from multiple perspectives respectively. The details are as follows:1. The copolymers (PAANa-co-BA) were synthesized by solution copolymerization of acrylic acid with butyl acrylate. The copolymers were characterized by FT-IR, thermogravimetric (TGA), differential scanning calorimetry (DSC), surface tension and ubbelohde viscosity. The effect of the monomer ratio, pH, polymer dosage on dispersion properties were discussed through contrast experiment, and the optimum experiment condition were obtained. The morphology of the barium sulfate particles examined by scanning electron microscopy (SEM). The results showed that the copolymer could significantly reduce the agglomerate of barium sulfate particles and enhance the consistency of particle size. The particle size and distribution were studied by laser particle size analyzer. The particle size distribution narrowed with the copolymen but the effect for reducing the particle size was not obvious. Zeta potential of the suspension confirmed the rule of pH and polymer dosage to barium sulfate suspension rate assistly.2. In order to improve the ability of hard water tolerance and better polymer solvation effects, acrylic acid-based, copolymers containing hydroxypropyl acrylate (HPA) and2-acrylamide-2-methyl propane sulfonic acid (AMPS) were synthesized by aqueous copolymerization. The structures of the P(AANa/HPA/AMPSNa) were confirmed by ’H-NMR, FT-IR. The thermal properties and intrinsic viscosity of the polymer were confirmed by thermogravimetric (TGA), differential scanning calorimetry (DSC), ubbelohde viscosity testing. The optimum experiment condition of preparing copolymers for dispersing ferric oxide and titanium dioxide were confirmed by orthogonal test. While, the tests showed that iron oxide and titanium dioxide had a quite high rate of suspension respectively at a low polymer dosage, and pH had a great influence on polymer dispersion properties, the best pH of system was12. In addition, the dispersion of TiO2particles using copolymer were detected intuitively by scanning electron microscopy (SEM), laser particle size analyzer, X ray diffraction (XRD) and Zeta potential test. Compared with Poly (sodium acrylate/hydroxypropyl acrylate), the ternary polymer could make a better dispersion of titanium dioxide.3. Acrylic acid-based, hydrophobically modified polymers containing the hydrophobic monomer N-tert-Butylacrylamide (NTAM) and varying amounts of2-acrylamide-2-methyl propane sulfonic acid (AMPS) were synthesized. The ternary polymer P (AANa/NTAM/AMPSNa) contains strong anchoring effect, volume effect and hydrophobic interaction of non ionic groups. The basic properties of the copolymer was confirmed by ’H-NMR, FT-IR, thermogravimetric (TGA), surface tension, ubbelohde viscosity testing, etc. Sample P-5was selected through stability analyzer. The properties of suspension was studied, copolymer composition, pH, and polymer dosage were all have remarkable effect on the dispersion of titanium dioxide. The dispersion of titanium dioxide particles observed intuitively by scanning electron microscopy (SEM), laser particle size analyzer, X ray diffraction (XRD) showed that the copolymer P-5could greatly enhance the uniformity of titanium dioxide particles distribution and the consistency of particle size.