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Preparation of waste newspaper reinforced soy-based adhesive and its boiling water resistance performance(PDF)

Journal of Forestry Engineering[ISSN:2096-1359/CN:32-1862/S]

2020 No.06
Research Field:
生物质能源与材料 执行主编:勇强 许凤
Publishing date:


Preparation of waste newspaper reinforced soy-based adhesive and its boiling water resistance performance
CHENG Shengyuan YIN Hao CHEN Maiquan ZHAO Jianliang ZHAO Dandan CHEN Nairong*
College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China
waste newspaper defatted soybean flour soybased adhesive boiling water resistance performance
Woodbased composites (e.g. plywood) are widely used to make furniture and building, while they are mainly bonded with formaldehydebased and/or petroleumbased resins that cause serious health and environmental problems. Due to health concerns and reduced petroleum reserves, researchers have been trying to replace conventional formaldehydebased and petroleumderived resins with sustainable and environmentally friendly biomass derived resins for making woodbased composites. A formaldehydefree bioadhesive composed of waste newspaper powder (WNP), defatted soybean flour (DSF), and polyamidoamineepichlorohydrin (PAE) resin was developed to prepare the Eucalyptus urophydisbased threelayer plywood. The effects of WNP content, hotpressing temperature and hotpressing time on the bonding strength of the adhesive were evaluated by the shear strength of the plywood via the threehour boiling water soaking test. The results showed that the shear strength was improved as the increase of the WNP content. All the plywood samples bonded with the pure DSF adhesive were delaminated in the boiling water test. When PAE was added, the shear strength of plywood reached 0.72 MPa, and reached the highest shear strength (1.16 MPa) when 9.47% WNP was further added. The interaction between hotpressing time and temperature affected the shear strength significantly. The shear strength improved firstly and then decreased as the hotpressing time increased. When the hotpressing time was 0.59 min/mm, the shear strength was 0.82 MPa. When the hotpressing time increased to 3.92 min/mm, the maximum shear strength of 1.35 MPa was obtained. The shear strength improved with the increase of hotpressing temperature. The shear strength was 0.65 MPa at the hotpressing temperature of 60 ℃. Plywood hotpressed at the temperature of 110 ℃ showed the shear strength of 1.07 MPa, exceeding that of the 60 ℃ by 64.6%. The curing temperature of the adhesive was comparable to the commercial ureaformaldehyde resin, while displayed better gluability. The Xray photoelectron spectroscopy analysis indicated that the carboxyl and hydroxyl groups in WNP were participated in the chemical crosslinking reactions along with hydroxylazetidinium ring groups in polyamide epichlorohydrin to form the ether and ester bonds, which in turn improved water resistance of the cured WNPDSFPAE adhesives. The scanning electron microscope analysis indicated that the fibers of WNP were formed a composite structure with other adhesive components, resulting in the cured adhesive with a dense structure and few cracks. The use of WNP as a component in biobased adhesives may reduce the cost as a result of the decreased DSF consumption. The adhesive characteristics including excellent water resistance and fast curing performance showed great potential to produce plywood with high moisture resistance.



Last Update: 2020-11-11