METHOD OF PRODUCING HEAT INSULATING MATERIAL Russian patent published in 2013 - IPC C04B40/00 C04B18/26 C04B20/00 

FIELD: chemistry.

SUBSTANCE: invention relates to construction, particularly to a method of producing heat insulating material based on wood processing wastes. The method of producing heat insulating material involves mixing solution-pretreated wood aggregate, portland cement, an additive and water, followed by moulding and hardening. The wood aggregate used is industrial chips. The solution used to treat the aggregate is 30% sodium glass solution in amount of 10% of the weight of the wood aggregate. The portland cement used is based on portland cement clinker with ultimate strength of 40 MPa, which is premixed with the additive which is in form of powdered calcium chloride with weight content of calcium chloride of at least 90% and in amount of 2% of the weight of portland cement. After mixing said components with water, the mixture is further mixed with process foam from an aqueous solution of 1% protein hydrolysate, with the following ratio of components, wt %: industrial chips - 38-40, said sodium glass solution - 3.8-4.0, portland cement - 39-42, calcium chloride - 0.3-0.36, said process foam - 0.8-0.85, water - the balance. The material is moulded in a press mould at pressure of 0.1÷0.35 MPa, followed by hardening at temperature of 50÷60°C and relative air humidity of 70÷80%. After hardening, a cladding is deposited, the cladding consisting of a polyol and a polyisocyanate, with the following ratio of components, wt %: polyol - 55, polyisocyanate - 45.

EFFECT: low density of the material and improved heat insulation properties thereof.

1 dwg, 1 tbl