Preparation of NCC/Alkali Lignin Based Rigid Polyurethane Foam
Under the condition of polymethylene polyphenyl isocyanate (PAPI) as raw material, water as chemical foaming agent, n-pentane as physical blowing agent, dimethyl silicone as foam stabilizer, triethylenediamine as catalyst, the rigid polyurethane foam was prepared by PAPI reacting with polyethylene glycol(PEG). 20 parts (mass fraction) of PEG-400 as standard, optimal preparation conditions of polyurethane foam were isocyanate index 1.15, 23 parts of PAPI, 0.2 parts of dimethyl silicone, 0.2 parts of water, 1.5 parts of n-pentane, and 0.02 parts of triethylenediamine. On the basis of this condition, NCC/ alkali lignin based rigid polyurethane foam was prepared with addding 0.4 % NCC(calculated as PEG-400), adding 10 % alkali lignin in order to replace the dosage of PEG-400.
NETL
NSTL
万方数据
维普
