Study on the Application of Novel Nitrogen-Phosphorus Flame Retardants in Waterborne Polyurethane
Waterborne po lyurethane materials are widely used in coatings and foam plastics due to their excellent thermal stability and mechanical performance.However,the extreme flammability limits their applications.Using polytetramethylene ether glycol,polypropylene glycol and isophorone diisocyanate as primary reagents,a synthesized self-made flame retardant DOPO-MA-DIPA as the primary chain extender,and 2,2-dimethylolpropionic acid(DMPA)as the secondary chain extender,flame-retardant waterborne polyurethane was successfully prepared via the prepolymer technique.Characterization of the flame retardant and polyurethane was done using fourier transform infrared spectroscopy,testing of the flame retardant's residual carbon content and expansion in height was conducted,and the flame retardancy of the polyurethane was examined through oxygen index measurement,vertical burning test and horizontal burning test.It was found that when the addition of the flame retardant reached 6%of the waterborne polyurethane's effective constituents,the limiting oxygen index increased from 22.7%to 27.7%,No melt drippings were seen in the horizontal burning test,indicating a remarkable enhancement in flame retardancy.
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