| 摘要: |
| 为降低高温热处理所需温度和缩短保温时间，赋予处理材料阻燃安全性，采用氮磷阻燃剂(FR NP)作为催化介质，对杨木进行阻燃浸渍处理，再经过120～160℃蒸汽热处理得到阻燃联合低温热处理(NP Ht)杨木.结果表明：NP Ht杨木表面颜色装饰性增强，极限氧指数(LOI)＞39.00%，烟密度等级(SDR)＜40；阻燃联合150℃低温热处理(NP Ht 150)与220℃高温热处理(Ht 220)杨木的颜色相近，表面硬度和胶合强度分别提高3415%，5350%，保温时间缩短75%.FR NP能促进杨木低温热降解，但纤维素降解程度相比Ht 220杨木明显降低，低温热处理改善了FR NP在杨木细胞壁上的分布，其微观结构破坏程度明显降低. |
| 关键词: 低温热处理 阻燃 表面脆性 胶合强度 杨木 |
| DOI：103969/j.issn.1007 9629201706017 |
| 分类号: |
| 基金项目:国家林业公益性行业科研专项（201404502）;青年教师科学研究中长期项目（121701019） |
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| Surface Properties and Thermal Stability of Modified Poplar Wood Combined NP Fire Retardant Pre treatment with Heat Treatment |
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CHU Demiao, MU Jun, LAI Zongyuan, ZHANG Xinyu
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Key Laboratory of Wood Material Science and Utilization, Ministry of Education, Beijing Forestry University, Beijing 100083, China
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| Abstract: |
| In order to improve the efficiency of heat treatment and the fireproofing of treated wood, nitrogen phosphorus fire retardant(FR NP) was used as an accelerating medium. The poplar(populusbeijingensis) wood samples were pre impregnated by FR NP and then heat treated at 120160℃. Results show that surface decorating property of the modified poplar wood combined FR NP pre treatment with low temperature heat treatment(NP Ht) is enhanced. The limiting oxygen index(LOI) value of NP Ht wood is higher than 39.00% and smoke density rating(SDR) is lower than 40. Meanwhile, the wood surface color of modified poplar wood combined FR NP pre treatment with 150℃ heat treatment(NP Ht 150) is mostly close to that of poplar wood treated by 220℃(Ht 220). Compared with that of Ht 220wood, the surface hardness and bonding strength of NP Ht 150is improved by 3415% and 5350%, respectively. The treating duration decreased by 75%. The FR NP could accelerate the decomposition of wood chemical components during the low temperature heat treatment. However, the degradation degree of celluloses is lower than that of Ht 220wood, the processes of low temperature heat treatment enhances the distribution of FR NP in wood and the destruction level of the NP Ht 150wood cell wall is much lower than that of Ht 220wood. |
| Key words: low temperature heat treatment fire retardancy surface brittleness bonding strength poplar wood |
