Method for manufacturing wood material boards

Details Method for manufacturing wood material boards Method for manufacturing wood material boards

C - Chemistry, Metallurgy

08

L

154/97

C08L 75/02 (2006.01) C08L 97/02 (2006.01)

Patent

CA 1045536

ABSTRACT OF THE DISCLOSURE: An improved method of manufacture of wood material boards with urea as bonding agent, wherein to accelerate the method, urea is prereacted in a mixing reactor in the presence from about 1 to about 3% by weight based upon the wood material of a catalyst before it is sprayed into the wood raw material, the catalyst being selected from the group consisting of (a) water soluble salts of non-precious metals selected from the group consisting of Li, K, Ca, Al, Mg, Zn, Fe, Co, Sn and Pb, (b) water soluble mono- or disaccharides, (c) tertiary amines selected from the group consisting of triethylene diamine, triethylamine, tetramethylene diamine, hexamethylene diamine and hexamethylene tetramine, and (d) a solution of (a), (b) or (c), and thereafter the activated resultant reaction mixture of urea is introduced into the wood based raw material and the material pressed into boards at a temperature of 180° to 250°C.

207330

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