氨基接枝聚硼硅氧烷改性脲醛树脂的阻燃增韧研究OA

[Objective]Urea-formaldehyde resin(UF)is widely used in decorative materials such as plywood and decorative paper due to its excellent performance and cost advantages.However,because of the high brittleness and fire safety properties of UF in applications,it is imperative to conduct toughening and flame-retardant modification on such resin to broaden its application scope.[Method]Amino-grafted polyborosiloxane(N-PBS)was used as a monomer to prepare a N-PBS-modified flame-retardant and toughened UF resin(PUF)via in-situ polymerization.An impregnation adhesive system integrating adhesion,toughness,and flame retardancy was constructed to improve the mechanical properties and flame retardancy of UF.[Result]Owing to the modification of the UF main chain by the flexible N-PBS segments,PUF-coated d ecorative panels with 10%N-PBS(10%PUF)exhibited superior mechanical and flame retardant properties compared to pure UF-coated panels.(1)After 30 seconds of flame combustion,the backside temperature of the decorative panel decreased by 78.2℃,the burn-through time was delayed by 60 seconds,and the flame self-extinguished upon removal from the fire.(2)The dry bonding strength increased by 27%,and the wet bonding strength met the standards for Type Ⅱ plywood as specified in GB/T 9846-2015.(3)The toughness was improved,as evidenced by a reduction of 0.9 mm in curling radius in a relevant test.[Conclusion]By introducing N-PBS into the UF structure via in-situ polymerization,the chemical cross-linking is achieved,which significantly enhances the flame retardancy,bonding properties and toughness of UF,thereby providing technical support for enhancing the high value-added applications and expanding the application scope of UF.