Preparation and Optimization of Coconut-Based Polyurethane Foam
Microwave-assisted liquefaction technology was used to liquefy coconut fiber to obtain liquefied substance.Using liquefied substance as raw material,triethylene diamine(TEDA)and tin isocrylate(TECH)as composite catalyst,water as foaming agent,and polyphenylmethanepolyisocyanate were used to synthesize rigid polyurethane foam(PURF)by one-step reaction.The optimum preparation conditions are as follows,the mass ratio of TEDA and TECH as catalyst is 4∶5,catalyst mass fraction is 5％,foam stabilizer M-8818 mass fraction is 2.5％,foaming agent mass fraction is 2％.The compression strength of PURF prepared under these conditions is 223 kPa,which is superior to most biobased PURF.The liquefaction,liquefaction agent and PURF were characterized by Fourier transform infrared spectroscopy(FT-IR),and the foam pores were observed by scanning electron microscopy(SEM).The results show that most of foam pores are obturator,and no isocyanate group is left in the system.A cone calorimeter was used to analyze the combustion behavior of the optimal PURF,and the maximum heat release rate(HRR)is 250.6 kW/m2.
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