Journal
POLYMERS
Volume 9, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/polym9080373
Keywords
humins; hydrothermal treatment; phenol-formaldehyde adhesive; hydrolysis
Categories
Funding
- National Natural Science Foundation of China [21606045]
- Science and Technology Planning Project of Guangdong Province, China [2017A010103047]
- Natural Science Foundation of Guangdong Province of China
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Humins are low-value-added byproducts from the biomass acid hydrolysis process. In the present work, humins were first employed as a phenol replacement for synthesis of modified phenol-formaldehyde adhesives through a two-step process. In this process, humins were first utilized to obtain alkaline soluble products, mainly consisting of phenolics, through a hydrothermal process. The obtained alkaline soluble products then reacted with phenol and formaldehyde to produce humin-phenol-formaldehyde adhesive (HPFA). The physicochemical properties of HPFA, including viscosity, bonding strength, pH, free formaldehyde level, free phenol level and solid content, met the requirements of the GB/T 14732-2006 Chinese National Standard.
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