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Urea formaldehyde resin (UF) adhesive

[China paint information according to China adhesive report] as the core component of electro-hydraulic servo control, urea formaldehyde resin adhesive is a kind of wood adhesive with the largest consumption in the world, accounting for more than 80% of the consumption of wood adhesive

compared with phenolic resin and melamine resin, urea formaldehyde resin has poor water resistance, mainly because after curing, there are still hydrophilic - chzoh, -oh and easily hydrolyzed - CONH - group in the structure of urea formaldehyde resin. At present, the research on modification at home and abroad is mainly to change the water resistance of the resin by adding modifiers for copolymerization and blending

Chang Juncheng et al. Added modified substances melamine and polyvinyl alcohol in the process of synthesizing urea formaldehyde resin, and reacted with methyl to form acetal structure, reducing the above groups and improving water resistance; Lin Jingwu and others synthesized phenol melamine urea formaldehyde resin by copolycondensation, which has good water resistance and bonding properties in practical use

Li Laibing modified urea formaldehyde resin with powdered oxidized starch as modifier. Because the aldehyde group of oxidized starch can form acetal with methyl in urea formaldehyde resin and cross-linked, thus improving the bonding strength and water resistance. On the basis of high-precision synthesis, opelities and other RN initiated graft copolymerization, which connected certain resorcinol and tannin extracts as branching units to enhance water resistance; Sumin kiml et al. Mixed polyacetic acid vinyl acetate lotion with pulse formaldehyde resin and applied it to the bonding of interior decorative panels. The experimental results showed that due to the formation of hydrogen bonds between the phenolic group of urea formaldehyde resin and the shuttle group of polyvinyl acetate, the adhesive performance, water resistance and formaldehyde emission of the resin were improved, which could adhere to the upper and lower movement directions of the folding table, unchanged; Krister Holmberg et al. 91 improved the water resistance of the graphene new lithium electronic battery they developed at the bonding site by mixing starch with a high concentration of melamine urea formaldehyde resin containing methylamine groups; In addition, by adding a certain amount of isocyanate vinegar (PMDI) or borax in the synthesis process, the water resistance of urea formaldehyde resin can be significantly improved, which may be due to the rapid bonding between wood adhesive layer and adhesive layer or partial thickening in the bonding process

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