Study on Low-Toxicity Fire-Retardant Treated Technology of Wood

Wood is widely used as the materials for architecture, furniture and interor decoration. However, the conflagration is so serious that the fire retardant treatment has become urgent for wood materials. As more and more stress is laid on health and environment protection, fire retardant develops toward low toxicity and smoke suppression. In order to explore a low-toxic and highly-efficient fire retarding treatment technology, Eucalyptus.sp. and Choerospondias axillaris(Roxb.) wood were chosen as experiment materials, and a low-toxic fire-retardant solution consisting of dicyandiamide, phosphoric acid, boric acid, and triethanolamine was applied. The influence factors including concentration(A), temperature(B), pressure(C), soaking time(D) were investigated with orthogonal method, and TG and DSC evaluation were conducted. What´s more, the oxygen index and smoke density were measured to seek for the best treatment technique. The results are as follows: (1) On the one hand, FRW itself contains no heavy metal, formaldehyde or any other toxic substance, therefore, it won´t pollute the environment or hazard people´s health when in use. On the other hand, barely smoke or toxic gas generate during the pyrolysis process of the wood treated with fire retardant. Therefore, FSW is a low-toxic fire retardant. In addition, it also has good fire retardant properties. (2) The best production condition for Eucalyptus sp. was A3B3ClD2,and the best production condition for Choerospondias axillaris (Roxb.) was A3B3C3D1.