译 名：
Preparation of UV-curing flame-retardant coating for parquet using open paint process
作 者：
HE Yanrong;WU Yuzhang;ZHANG Jingpeng;QU Wei;Research Institute of Forestry New Technology, Research Institute of Wood Industry, Chinese Academy of Forestry;
关键词：
UV curing;;transparency;;flame retardant;;parquet;;open paint technique
摘 要：
Wooden floors have been become more and more popular with consumers due to their natural texture, beautiful color, energy saving and environmental protection, but wood materials are flammable, limiting their wide applications. The floor is in every room of the building, which can promote the spread of the fire once a fire occurs. So, it is of great significance to take necessary fire-retardant treatments for the floor. From the perspective of the “three elements” theory of combustion, it is more convenient and effective to directly apply flame retardant coatings on the floor surface. In order to obtain better flame retardant properties, the coating amount is often greater than 250 g/m~2 or even as high as 500 g/m~2, which is not suitable for the open paint process. The relatively low coating weight also poses a challenge to the flame retardant properties of the coatings. Based on the intumescent flame-retardant theory, a UV curable flame retardant coating was prepared, which was prepared by mixing ammonium polyphosphate(APP), pentaerythritol(PER) and polyurethane-modified acrylate resin. This coating was used for the parquet based on open paint process. The transparency, thermal stability, flame retardancy of the coatings were tested using the ultraviolet spectrophotometer, cone calorimeter, and field emission scanning electron microscopy, respectively. The results showed that, when m(APP)∶m(PER) = 3∶1, the transmittance of the coating was 67%-80% in the wavelength of 400-800 nm. Compared with that of the parquet coated without the flame retardant, the peak heat release rate(pHRR), average heat release rate within 60 s(AveHRR_(60 s)) and total heat release rate within 150 s(THR_(150 s)) of the coated samples with flame retardant were decreased by 65.7%, 54.2% and 38.2%, respectively. The SEM results showed that the residual char of the coating had the optimal intumescent state. In addition, the shelf life of the coating was more than 168 h at temperature of 70 ℃. The water resistance, the adhesion, the hardness, and the wear resistance of the coating are satisfied with the requirements of the standard of GB/T 18103-2013 “Engineered wood flooring”. According to GB 8624-2012 “Clssification for burning behavior of building materials and products”, the flame retardant rating of the parquet floor can reach B1 level, when the wet coating density is 50 g/m~2.
