To widen the range of use applications of a paper solidified product, thereby increases the quantity of recycled waste paper by impregnating a paper with an aqueous solution containing an aqueous paper solidified product forming component of alkaline silicate and drying the paper to solidify the permeation solution.
A paper is impregnated with an aqueous solution of alkaline silicate (silicate) and addition products are individually and simultaneously mixed with and dispersed into the aqueous solution. The silicate is a silicate itself or a mixture of the silicate and other components which is called a soluble glass or a liquid soluble glass. The additives to be combined with the soluble glass are a hydrochloric acid, an aluminum phosphate or the like and in addition to the acid and a basic compound, are such as amines or a carbonic acid gas. Theses additives work as a curing agent and a curing promotor for the aqueous solution of the silicate. In order to solidify the paper impregnated with the aqueous solution of the silicate, a mixture of the aqueous solution and the additives or the aqueous solution of the silicate or the additives are individually sprayed or spread over the paper after adjusting the concentration, or the aqueous solution and the paper are mixed simultaneously and the paper is dried to cure the aqueous solution after impregnation. Thus it is possible to obtain the paper solidified product with high heat resistance and superb resistance to a solvent and an oil, and expand the use applications of the paper setting product.
MIYAHIRA TAKAO
MOMOSE KIYOSHI
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