Formaldehyde‐free resin impregnated paper reinforced with cellulose nanocrystal (CNC): Formulation and property analysis

Abstract

The formaldehyde‐free resin impregnated paper is expected to be applied to interior decoration materials and furniture. This is not only conducive to the development of indoor environment toward green and environmental protection, but also beneficial to people's health. In this work, the formaldehyde‐free resin (waterborne polyurethane and waterborne acrylic acid) mixed with cellulose nanocrystal (CNC) were separately coated on a raw decorative paper by a dipping method to obtain formaldehyde‐free impregnated paper with outstanding surface bound strength and abrasion resistance. The surface bound strength and abrasion resistance were tested by means of universal ability test machine and abrasion tester. The results showed that waterborne polyurethane and waterborne acrylic acid enhanced by CNC had excellent dispersion, and the bonding properties of formaldehyde‐free impregnated paper were improved by 41.3 and 33.3%, respectively. Meanwhile, the abrasion resistance of formaldehyde‐free impregnated paper was improved by the crystal effect of CNC. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48931.

Multi‐copolymerization retouch butadiene styrene block polymer resin for dual temperature change curing of wood‐based interface

“…With the increasing demand for green products, developing formaldehyde-free adhesives has become a research hotspot in wood-based panels. 3 Styrene butadiene latex (SBL), usually using water molecules as solvents, has no volatile hazardous chemicals and can achieve zero formaldehyde release during the bonding process with the wood base, 4 which is in line with the current environmental protection concept. It provides a substitute for traditional resins with the advantages of low cost, high strength, and easy modification.…”

“…However, in the production and use of these resins, there are serious problems with the release of formaldehyde and the associated products, 2 and in addition, the deterioration of durability at high temperatures or in high humidity environments constitutes another challenge for the wide application of these resins. With the increasing demand for green products, developing formaldehyde‐free adhesives has become a research hotspot in wood‐based panels 3 . Styrene butadiene latex (SBL), usually using water molecules as solvents, has no volatile hazardous chemicals and can achieve zero formaldehyde release during the bonding process with the wood base, 4 which is in line with the current environmental protection concept.…”

“…ρ r and ρ s are the densities of resin and cyclohexane, respectively. In this paper, the density of resin is 1.005 g/cm 3 , while the density of cyclohexane is as 0.679 g/cm 3 . Formulas (3), ( 4), (5) were used to calculate the crosslinking density V e : 13…”

Isolation and Characterization of Cellulose Nanocrystals from Waste Cotton Fibers Using Sulfuric Acid Hydrolysis

“…[ 4 ] The peaks at 1162 and 1060 cm −1 were assigned to the CH 2 scissor vibration and C─O─C symmetric stretching vibrations, respectively. [ 27 ] In waste cotton fibers, the peak at a wavelength of 1238 cm −1 is related to the C─O stretching vibration of the aryl group in lignin, which disappears after hydrolysis. [ 28 ] In the FTIR spectrum of CNCs, the small adsorption peak at 1203 cm −1 indicates the presence of sulfate groups due to the esterification reaction by sulfuric acid hydrolysis (S═O vibration), which agree with findings reported in the open literature.…”

Fabrication and Characterization of Cellulose Nanofiber Aerogels Prepared via Two Different Drying Techniques

“…A large number of exposed hydroxyl groups on the surface of nanocellulose-based wet gel promotes the formation of inter-and intramolecular hydrogen bonds [14,15]. Additionally, nanocellulose can be gelated to form a three-dimensional network structure of physical cross-linking [16,17]. Generally, nanocellulose aerogel materials can be obtained by replacement of liquid solution in wet gel by air via supercritical CO 2 drying, freeze-drying, and other technologies [18][19][20].…”