The invention discloses a method for preparing degradable
biomass polyurethane foamed plastic from economic forest
processing residues, belonging to the technical field of
chemical industry of forest products. The method mainly comprises the following steps: uniformly mixing a liquefier and a catalyst in a 1-
ton reaction kettle, adding economic forest
processing residues, closing the reaction kettle feed port, starting a stirrer and a condensing unit, heating to 140-150 DEG C, liquefying for 60-90 minutes, naturally cooling to 40 DEG C, and adding
oxide for
neutralization until the pH value is 7-8; heating to 120-130 DEG C, adding a modifier, keeping the temperature for 30-60 minutes, heating to 150-160 DEG C, stirring under
reflux for 1-2 hours, and terminating the reaction; cooling to
room temperature to obtain the modified liquefying product; and mixing the liquefying product, polyether glycol, water, liquid CO2,
silicon oil, an amine catalyst, a
tin catalyst and a
flame retardant under
high pressure, sending into a V-shaped
expansion chamber for expansion, and curing by heating to obtain the degradable
biomass polyurethane foamed plastic. The method can obviously lower the production cost of the
polyurethane foamed plastic and endow the polyurethane foamed plastic with biodegradability; and the detection shows that the polyurethane foamed plastic conforms to the
national standard GB / T10802-2006.