通过对比在纤维板表面涂覆NaOH和Na2SiO3溶液,基于小室燃烧法、垂直燃烧仪和极限氧指数等研究其阻燃性能.结果表明,表面改性纤维板的阻燃性能排序为:涂Na2SiO3纤维板>涂NaOH+Na2SiO3纤维板>涂NaOH纤维板>未处理纤维板>泡水处理纤维板,单面涂覆的阻燃性能优于双面涂覆,极限氧指数可达25.2%.提出了NaOH与Na2SiO3对中密度纤维板的阻燃机理,涂覆NaOH溶液易使纤维板的阻燃物质迁移至表面,掺入的Na2SiO3可在纤维板表面形成含(=)Si-O-Si(=)链的三维网状硅质层,进而提高其阻燃性能.
The effects of covering NaOH and Na2SiO3 solution on the flame retardant properties of medium density fiberboard were investigated based on the techniques of chamber combustion method, the vertical combustion apparatus and limit oxygen index.The results show that various flame retardant performance of fiberboard are follows: fiberboard covered Na2SiO3 > NaOH + Na2SiO3 > NaOH > untreated fiberboard > bubble water treatment, the single-side pasting presented a higher flame retardant performance than the double-side pasting, the limit oxygen index could reach 25.2%.It is proposed the flame retardant mechanism of NaOH and Na2SiO3 on the medium density fiberboard, coating NaOH solution makes the flame retardant substances migrate out the surface, coating Na2SiO3 is benefit to form a cross-linking siliceous layer containing (=)Si-O-Si(=) chains, leading to an improvement of the flame retardant performance.
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