AQUEOUS WATER REPELLENT FOR SUBSTRATE TREATMENT AND METHOD FOR PRODUCING THE SAME, METHOD FOR PRODUCING MODIFIED PLYWOOD OR MODIFIED VENEER-LAMINATED MATERIAL AND METHOD FOR PRODUCING WOODY FIBERBOARD

摘要

PROBLEM TO BE SOLVED: To obtain an aqueous water repellent having high water miscibility and storage stability, usable as a water repellent for a neutral substrate by mere dilution with water and affording the neutral substrate with excellent water repellency and dimensionally stabilizing effect through coating or impregnating it therewith. SOLUTION: The aqueous water repellent for treating substrates such as lignocellulose-derived materials is characterized by containing a product that is obtained by cohydrolyzing condensation in the presence of an organic or inorganic acid between (A) 100 pts.wt. of an organosilicon compound of the formula (1): (R1)a(OR2)bSiO(4-a-b)/2 (R1 is an alkyl; R2 is an alkyl; (a) is 0.75-1.5; (b) is 0.2-3; 0.9