The present invention belongs to the technical field of artificial boards, and relates to a curing agent for a
formaldehyde-free substrate, which is composed of 5-10wt% of methyl ethyl
ketone oxime, 20-30wt% of
polyacrylamide, and the balance of water by weight percentage. A preparation method and application of the curing agent for the
formaldehyde-free substrate are also disclosed. The curing agent for the
formaldehyde-free substrate disclosed by the present invention has good sealing property, can reduce the
viscosity of
isocyanate, extend the application period, and improve the fluidity and dispersibility of spray glue. By sealing the free
isocyanate group, the pre-curing during
drying is reduced, and the
isocyanate is unsealed during high-temperature
hot pressing, and the isocyanate is cured quickly, the
hot pressing efficiency is improved, the
hot pressing time is shortened, and the water loss is reduced; more active isocyanate groups are retained in the
adhesive, the bonding performance and
water resistance are improved, the amount of isocyanate glue applied is reduced, and the reaction with water is reduced. The present invention can also effectively improve the production capacity of the formaldehyde-free floor substrate and reduce the cost; by increasing the
moisture content, the expansion or contraction degree caused by the change of
humidity in the external environment is reduced, and the dimensional stability is improved.