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ARS Home » Midwest Area » Peoria, Illinois » National Center for Agricultural Utilization Research » Plant Polymer Research » Research » Publications at this Location » Publication #368017
Research Project: Renewable Biobased Particles

Location: Plant Polymer Research

Title: Poly(acrylic acid) grafted soy carbohydrate as thickener for waterborne paints

Author
item Jong, Lei

Submitted to: Materials Today Communications
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/27/2019
Publication Date: 12/28/2019
Citation: Jong, L. 2019. Poly(acrylic acid) grafted soy carbohydrate as thickener for waterborne paints. Materials Today Communications. 23:100882. https://doi.org/10.1016/j.mtcomm.2019.100882.
DOI: https://doi.org/10.1016/j.mtcomm.2019.100882

Interpretive Summary: Defatted soy flour mainly consists of soy protein and soy carbohydrate. After the soy protein is extracted from defatted soy flour, the remaining waste is mostly soy carbohydrate. Soy carbohydrate has little commercial use, but is generated in large quantities every year. During this research, we investigated the use of soy carbohydrate in latex paint as a thickener by grafting a water-soluble polymer onto the soy carbohydrate. The flow properties of the latex paint with the new thickener show a useful thickening effect for it to be used as an additive to latex paint. This study will facilitate the creation of new markets for soybean growers and processing industries.

Technical Abstract: Thickeners are widely used to change rheological properties of latex paints. Soy carbohydrate is an abundant, but a rarely utilized agricultural by-product. The grafting of poly(acrylic acid) onto soy carbohydrate particles forms gel particles that can change rheological properties of latex paints. The grafting polymerization of acrylic acid onto carbohydrate particles using ammonium cerium (IV) nitrate as initiator increased the particle size and viscosity of the aqueous particle dispersion. The viscosity increased with the increased amount of grafted poly(acrylic acid). Strain and frequency dependent moduli show a difference in dispersion-properties between the grafted soy carbohydrate and hydroxyl ethyl cellulose. The latex paint with poly(acrylic acid) grafted soy carbohydrate shows similar viscosity at low shear rate region and lower viscosity at higher shear rates when compared to the latex paint with hydroxyl ethyl cellulose. High-shear-recovery experiments of the latex paints predict sagging properties that are consistent with the ASTM sagging tests.