MUF-PVAc共混树脂基膨胀型水性木材阻燃涂料的研究
Fire retardant properties of intumescent waterborne fireretardant coatings based on MUF-PVAc mixed resin for wood.
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摘要: ：以三聚氰胺改性脲醛树脂(MUF)与聚乙酸乙烯酯树脂(PVAc)共混物作为成膜树脂，以磷酸脒基脲(GUP)、聚磷酸铵(APP)、三聚氰胺(MEL)和季戊四醇(PER)的组合物为膨胀阻燃体系，制备适用于木材的膨胀型水性阻燃涂料。以锥形量热仪法、傅里叶变换红外光谱法和热重分析法为评价手段，对膨胀型水性木材阻燃涂料涂覆的胶合板A、仅涂覆成膜树脂的胶合板M和素胶合板S的阻燃性能进行了对比分析。结果表明：胶合板A的热释放速率、总热释放、烟释放速率均比胶合板M、胶合板S的显著降低，但其残余物质量最高，并显著延长了点燃时间。在传统的膨胀型阻燃体系中引入GUP后，与APP在不同温度区间起到催化成炭作用，有利于提高涂料的阻燃性能。胶合板A的涂层受热辐射后炭化彻底，表明GUP-APP-MEL-PER是MUF-PVAc共混树脂的有效膨胀型阻燃体系。Abstract: An intumescent waterborne fireretardant coating for wood was prepared using the blend of melamine ureaformaldehyde resin(MUF) and polyvinyl acetate resin(PVAc) as filmforming resin, and the mixture of guanylurea phosphate(GUP), ammonium polyphosphate(APP), melamine(MEL) and pentaerythritol(PER) as intumescent fire retardant system. The fire retarding performance of three batch plywood specimens, which were painted with the prepared waterborne intumescent fireretardant coating(A), with the filmforming resin(M) and without any coating(S) respectively, was evaluated comparatively by cone calorimetry combined with thermogravimetric analysis(TGA) and Fourier transform infrared spectroscopy analysis(FTIR). The results showed that the heat release rate(HRR), the total heat release(THR) and the smoke release rate(SPR) of specimen A decreased more considerably than S and M. The highest value of mass of residual char(Mass) and markedly postponed time to ignition(TTI) were observed for specimen A. TGA analysis showed that GUP and APP played a catalytic charring effect in different temperature ranges, and the combination of two enhanced fire retarding performance of the coating by synergistic effects. FTIR analysis shows that the coating layer of A is thoroughly carbonized, further indicating that GUP-APP-MEL-PER is the effective fire retardant system of MUF-PVAc mixed resin.
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