Water Soluble Thermosetting Acrylic Resins for Industrial Paints (II)

Polymerization and Evaluation of Uniform Four-Components Copolymers

Abstract

The monomer mixture containing styrene (St) 19. 2 mole %, butylacrylate (BA) 56. 0 mole %, itaconic acid (IA), 11. 0 mole % andβ-hydroxyethylmethacrylate (HEMA) 13. 8 mole % was copolymerized to obtain the uniform composition copolymer by means of monomer dropping type free radical polymerization system in which each monomer was added during the polymerization according to the rate of monomer addition calculated from the multi-components composition scheme. The resulting copolymer compositions in various conversion were measured by means of NMR spectra. Triethyl amine was added to the copolymer to neutralize. Then the curing reagent and pigment of titanium dioxide were added, and the mixture was ball-milled to prepare a paint.
The properties of the paint thus prepared were evaluated as the thermosetting white enamel in comparison with the properties of the copolymer obtained from batch type copolymerization system.
(1) The resulting copolymer compositions in various conversion were pretty constant. This result means that the aimed uniform composition copolymers can be practically obtained.
(2) The paint film based on the uniform composition copolymer was better in the properties of acid resistance and stain resistance than on the copolymer obtained by the batch type copolymerization system. But the solvent resistance, boiled water resistance, mechanical physical properties etc.were almost the same.