APPLICATION OF POLYMETHYLHYDROGEN SILOXANE FOR PRODUCING A WATER RESISTANT GYPSUM PRODUCT AND GYPSUM/WOOD FIBER BOARD AND GYPSUM BOARD

摘要

The present invention discloses a method of increasing the water resistance of a gypsum containing material by including a polymerizable siloxane and Portland Cement as a catalyst in a gypsum slurry, which is then shaped and dried under conditions to promote the polymerization of the siloxane into silicone. The invention also discloses a method of increasing the water resistance of a gypsum containing material by including a polymerizable siloxane and Portland Cement as a catalyst in a hot calcined gypsum slurry that contains host fibers, which is then shaped, dewatered pressed and dryed under conditions to promote the polymerization of the siloxane into silicone.