The Effect of Carboxymethyl Cellulose Addition on the Properties of Starch-based Wood Adhesive

Abstract

Starch adhesive was prepared utilizing corn starch, polyvinyl alcohol, and borax as raw materials. A certain amount of water-soluble carboxymethyl cellulose (CMC) was added in the preparation process, and a certain percentage of polymethylene polyphenylene isocyanate pre-polymer as cross-linking agent was used to improve its water resistance. To evaluate the water resistance, three-layer plywood was fabricated by hot pressing, and bonding strength was measured using a mechanical testing machine according to the National Standard of the People's Republic of China GB/T 17657-2013. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) were used to characterize curing of the adhesion. The results showed that the initial viscosity, solids content, and bonding strength of the starch adhesive, as well as the interface compatibility between starch adhesive and pre-polymer, were all improved. The curing temperature of the adhesive decreased, and the optimal addition of CMC was 0.375%.

Effect of Cellulose Nanofibrils on the Bond Strength of Polyvinyl Acetate and Starch Adhesives for Wood

“…However, the t-test indicated no significant differences between samples of the starch adhesives because of the high variance of results, likely due to more challenging curing of starch in the presence of high moisture content and absence of heat treatment. The trend is in fair agreement with Qiao et al (2014), who found similar behaviour in CMC addition to starch in plywood and the optimal benefit from only 0.375% CMC dose, while higher concentrations produced weaker bond strength.…”

Water-Soluble Pressure-Sensitive Adhesives Containing Carboxymethyl Starch with Improved Adhesion to Paper

“…However, there are some reports on preparing CMS-based wood adhesive containing poly(vinyl alcohol) and polyisocyanates [17] or using other carboxymethylated polysaccharide derivative, i.e. carboxymethyl cellulose (CMC) for starch-based wood adhesives [18] or polyisobutylene/CMC pressuresensitive adhesives [19].…”

Effect of Melamine Allocation Proportion on Chemical Structures and Properties of Melamine-Urea-Formaldehyde Resins

“…UF resin is especially useful for bonding interior wood-based composite boards such as plywood, particleboard, and medium density fiberboard. In recent years, bio-based adhesives prepared from renewable natural resources have been widely researched, such as starch, tannin, and protein (Qiao et al 2014;Zhang et al 2014;Zhang et al 2015). Bio-based adhesives, however, cannot fully replace UF resins in the short period because of their high cost and low production efficiency.…”