Preparation and performance of phosphorus/silicon synergistic flame retardant non-ionic waterborne polyurethane
Polyurethane prepolymers were prepared by using dihydroxysilicone oil,polyether diols,and toluene diisocyanate as the main raw materials.A phosphorus containing flame-retardant polyol monomer 6-{(4-hydroxyphenyl)[(4-hydroxyphenyl)amino]methyl}dibenzo[c,e][1,2]phosphine oxide and trimethylolpropane as chain extenders,and polyethylene glycol with a molecular weight of 2000 was used as a hydrophilic chain extender to prepare a nonionic waterborne polyurethane dispersion with phosphorus/silicon synergistic flame retardant effect.The molecular structure of the resin was characterized by infrared spectrosco-py,and the effects of the introduction of dihydroxysilicone oil on the appearance,stability,particle size of the dispersion,as well as the mechanical properties,hydrophilicity,water resistance,thermal stability,and flame retardancy of the adhesive film were studied.The results indicate that the introduction of dihydroxysilicone oil can lead to an increase in the particle size of polyurethane disper-sion.When the introduction of dihydroxysilicone oil accounts for 25%of the prepolymerized polyol component,the waterborne polyurethane dispersion is unstable.As the introduction of dihydroxysilicone oil increases,the tensile strength and elongation at break of the adhesive film gradually decrease,and the mechanical properties significantly deteriorate.The hydrophilicity first decreases and then is basically unchanged and the contact angle gradually increases to be basically unchanged.The introduction of dihydroxysilicone oil can effectively improve the thermal stability and flame retardancy of polyurethane film.When the introduction of dihydroxysilicone oil accounts for 15%of the prepolymerized polyol component,the limit oxygen index of the adhesive film is as high as 28.2%,and the carbon residue rate at 600℃reaches 7.46%.
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