Preparation and characterization of phenol-formaldehyde adhesives modified with enzymatic hydrolysis lignin.
Phenol-formaldehyde (PF) adhesives modified with enzymatic hydrolysis lignin (EHL) were synthesized by a one-step process. The phenol component of the PF adhesives was partially substituted by EHL extracted from the residues of cornstalks used to produce bio-ethanol. The EHL-PF adhesives were used to prepare plywoods by hot-pressing. The pH value, viscosity, solid content, free phenol content, free formaldehyde content and brominable substance content of EHL-PF resins were investigated. The bonding strengths of the plywoods were determined, and the influences of the replacement percentage of phenol by EHL (a) and the NaOH content (b) on the properties of the adhesives were investigated. The results showed that the performance of the modified adhesives and the plywoods glued with them almost met the Chinese National Standard (GB/T 14732-2006) for first grade plywood when 20 wt% of the phenol was replaced by EHL.
Jin
Yanqiao
Y
College of Materials Science and Engineering, Fuzhou University, 2 Xueyuan Road, Fuzhou 350108, China.
Cheng
Xiansu
X
Zheng
Zuanbin
Z
D000269:Adhesives; D001672:Biocompatible Materials / Q000737:chemistry; D001709:Biotechnology / Q000379:methods*; D000431:Ethanol / Q000737:chemistry; D005557:Formaldehyde / Q000737:chemistry*; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry*; D019800:Phenol / Q000737:chemistry; D010636:Phenols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012972:Sodium Hydroxide / Q000737:chemistry; D013055:Spectrophotometry, Infrared / Q000379:methods; D013718:Tensile Strength; D013997:Time Factors; D014783:Viscosity
D000269:Adhesives; D001672:Biocompatible Materials; D010636:Phenols; D011108:Polymers; D005557:Formaldehyde; D019800:Phenol; D000431:Ethanol; D012972:Sodium Hydroxide; C011529:phenol-formaldehyde resin; D008031:Lignin