High performance waterborne aminoacrylic coatings from the blends of hydrosols and latexes

• Published in: Progress in organic coatings Vol. 49; no. 1; pp. 54 - 61
• Main Authors: Tang, Lin-Sheng, Zhang, Mei, Zhang, Shu-Feng, Yang, Jin-Zong
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 2004; Elsevier Sequoia
• Subjects: Acrylic hydrosol; Acrylic latex; Applied sciences; Blend; Coatings. Paints, varnishes and inks; Exact sciences and technology; Manufacturing; Polymer industry, paints, wood; Waterborne aminoacrylic coating; Acrylic latex; Blend; Waterborne aminoacrylic coating; Acrylic hydrosol; Gloss; Atomic force microscopy; Waterproofness; Hydrosol; Hardness; Experimental study; Performance; Coatings; Chemical synthesis; Molecular mass; Latex
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2003.08.007

High performance waterborne aminoacrylic coatings can be prepared from blends of well-designed hydroxyl acrylic hydrosols and hydroxyl acrylic latex. It is essential that the hydrosols must be compatible with the latex and have appropriate amount of hydroxyl and carboxyl groups. In order to meet above requirements, the weight-average molecular weight and calculated Fox T g of the hydrosol resins should be less than 13 000 and 30 °C, respectively, and the suitable contents of AA and HEA are about 6 and 10% by weight, respectively, based on all monomers. The film gloss and hardness can be improved by increasing the proportion of the hydrosols, but some disadvantages such as popping, slow-drying and abnormal high viscosity become conspicuous as weight percent of the hydrosol based on all binder solids exceeds 35%. The weight percent is preferably 25–35% for balanced film properties. AFM images confirm that well-designed hydrosols play an important role in dispersing pigments, which contributes to a smooth and glossy film.