中文摘要：

吸湿性对于木材阻燃剂至关重要，笔者参考中国公安行业标准GA159-1997关于水基阻燃剂吸潮率的测定方法，在环境温度为（26．7±0．3）℃、相对湿度为（92．7±3）％的条件下，测定了常见的磷系、硼系及复合阻燃剂的吸潮率，对不同阻燃体系的吸湿性进行了研究评价。结果表明，以下物质的吸湿性从小到大的顺序为硼酸、磷酸脒基脲、磷酸二氢铵、磷酸氢二铵、聚磷酸铵、磷酸脲、尿素；复合阻燃体系的吸湿性取决于各组分的吸湿性能，其中新型磷氮硼复合木材阻燃剂FRW的吸湿性最低。对阻燃剂的吸湿性与其分子结构的关系进行了讨论。

英文摘要：

Researches carried on to explore hygroscopicity of different fire retardant chemicals containing boron, phosphorous and both of them, and the moisture absorption rate of the fire retardant chemicals and their mixture was determined in the conditions of environment temperature （26.7± 0. 3）℃ and relative humidity（92.7±3）%, referring to the measuring method of moisture absorption ratio specified in China Public Security Ministery Standard GA 159-1997. The results showed that the moisture absorption ratio increased in accordance with the following order： boric acid, guanylurea phosphate （GUP）, mono-ammonium phosphate （MAP）, diammonium phosphate （DAP）, ammonium polyphosphate（APP）,urea phosphate and urea. The hygroscopicity of mixed fire-retardants depended on the hygroscopic property of each component, while a new P-N-B fire-retardant, FRW, was basically nonhygroscopic. Also, the relationship between the hygroscopictiy of a fire retardant and its molecular structure was discussed.