초록 ▼

Solid lignocellulosic material is bonded together by heating and pressing at a natural wood, pH by reacting sugars, starches or both in the presence of a catalyst capable of catalyzing transformation of the sugars and starches into a solid, insoluble in water, and an alkaline buffering agent if need

Solid lignocellulosic material is bonded together by heating and pressing at a natural wood, pH by reacting sugars, starches or both in the presence of a catalyst capable of catalyzing transformation of the sugars and starches into a solid, insoluble in water, and an alkaline buffering agent if needed, for example to make waterproof plywood or composite products from particulate wood without hydrolytic degradation of the wood.

대표청구항 ▼

A method of bonding solid lignocellulosic materials and thereby producing a waterproof bond, which comprises providing on a surface of said solid lignocellulosic material an adhesive-free bonding material consisting essentially of at least one sugar, starch or mixture thereof and an amount sufficien

A method of bonding solid lignocellulosic materials and thereby producing a waterproof bond, which comprises providing on a surface of said solid lignocellulosic material an adhesive-free bonding material consisting essentially of at least one sugar, starch or mixture thereof and an amount sufficient to catalyze transformation of the sugar or starch of a catalyst capable of transformation of the sugar or starch to cause waterproof bonding of adjacent lignocellulosic surfaces by means of the intermediate layer of adhesive-free bonding material therebetween, said catalyst being an alkaline salt or a mixture of an alkaline material and an acidic salt so that said bonding material will not decrease the pH after heating of the solid lignocellulosic material to below about 3.5, and pressing surfaces of the lignocellulosic material together at an elevated temperature and for a time sufficient to effect said bonding by said transformation reactions of the carbohydrate, and wherein the time, temperature and pressure are sufficient to produce a waterproof bond. A method according to claim 1, in which the lignocellulosic material comprises particles of wood.