The invention relates to a method for preparing rigid
polyurethane foam by utilizing
microwave liquefaction products of bamboo
processing residues, which is characterized in that:
polyethylene glycol 400,
glycerol and
ethylene carbonate mixed
liquefaction agent, 98%
sulfuric acid and dried and pulverized bamboo The
processing residue is put into a three-neck
bottle, and placed in a
microwave liquefaction reactor with functions of condensation, stirring, and
infrared temperature measurement for
microwave heating. After the reaction is completed,
neutralization reagents are added to neutralize the liquefied product to pH 7-8 , to obtain
plant polyols. Then, mix and stir the
plant polyol prepared above with polyether
polyol, catalyst, curing agent, water,
silicone oil, and
foaming agent evenly, then add MDI, nano-
activated carbon or
titanium dioxide, mix and stir for 10s-15s, and put it into the mold. Stand at
room temperature for foaming, curing, and demoulding to obtain rigid
polyurethane foam. The invention makes full use of bamboo resources, reduces the cost of liquefaction, the liquefaction product can be used in all components, and realizes the goal of converting all components of bamboo
processing residues into synthetic
polyurethane raw materials. The product has the characteristic of being able to absorb PM2.5, and is a An
environmentally friendly bio-based polyurethane rigid foam product.