Preparation And Application Of Degradable Polyurethane Foam

Green chemistry and sustainability are trends in the development of industrial chemistry.The depletion of non-renewable resources(petroleum,coal and gas)in the future and the environmental pollutions caused by the petroleum-based polymers motivate growing demands for renewable resources,which are biodegradable,non-petroleum,carbon neutral,and posing low risk to the environment,animals,human health and safety.As an agricultural waste,bagasse is mainly from sugar factories.Bagasse is particularly concerned with its high reserves,low cost and wide range of sources,including recyclability,environmental friendliness and biodegradability.In this paper,bagasse powder is used as a filler,and soy oil-based polyol is used instead of petroleum-based polyol to prepare bagasse/degradable polyurethane foam.The main works are summarized as follows:1.Using agricultural wastes and polyol derived from soy oil as raw materials to develop biodegradable rigid polyurethane foams(RPUFs)is beneficial to reduce the dependence on petroleum resources and promote sustainable environmental development.This study focuses on that bagasse as functional filler to improve and control the mechanical properties,biodegradability of RPUFs.With increasing levels of bagasse content,the density and mechanical properties of RPUFs increased,the biodegradation of RPUFs had greater enhancement,and all bio-foams had excellent insulation properties.All changes in performance were due to the active hydroxyl groups on bagasse reacted with excess isocyanate to form urethane,which affected the structure of RPUFs.In this study,scientific design and molecular regulation theory were applied to improve the utilization value of bagasse and develop high-performance biodegradable RPUFs for different industrial fields.2.Controlling sound absorption performance and analyzing the mechanism of the flexible polyurethane biofoams derived from vegetable oil polyol and filled with agricultural and forestry wastes can provide theoretical guidance in design thebiodegradable energy-saving sound absorbing materials.A series of bio-foams were synthesized by using soy oil-based polyol instead of50 wt% petroleum-based polyol with different content of natural resource bagasse as fillers.The FTIR analysis showed that the active H of bagasse reacted with-NCO to form urethane groups in biofoam matrix,and hydrogen bonding between bagasse and biofoam matrix was also observed.Density,SEM and water absorption indicated the effect of bagasse on the foam morphology.Structural changes enhanced the mechanical properties of bio-foams by mechanical measurements and slightly increased thermal stability by TGA.The foam with 5 wt% bagasse had the best degradation(after 12 weeks)and the weight loss increased from 17.34% to 22.04%(improved about 27.10%)compared to the reference foam without bagasse.The acoustic performance test showed that different bagasse content had different effects on different frequencies of biofoams.It is possible to control and enhance the sound absorption properties of the biofoams by adjusting bagasse content.In summary,this paper designed a kind of bagasse/soy oil-based degradable polyurethane foam,which alleviated the problem that polyurethane foam is currently difficult to degrade,reduced dependence on petroleum resources,reduced production costs,and improved the utilization value of agricultural waste bagasse.It has great economic benefits,meets the requirements of green environmental protection and sustainable development,and has broad application prospects in industrial production.