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硼酸复配低分子酚醛树脂改性速生杨木阻燃性能研究
王磊磊,岳孔,陆伟东,刘伟庆
0
(南京工业大学土木工程学院,南京 211816)
摘要:
利用差示扫描量热仪、热重分析仪等仪器对硼酸复配低分子酚醛树脂(简称B-PF)的热性能进行表征,利用该树脂浸渍改性国产速生杨木,研究其对速生杨阻燃性能的影响。结果表明,在原料配比为n(苯酚): n(甲醛):n(硼酸):n(氢氧化钠)=1:1.9:0.3:0.3的条件下合成的B-PF,pH值为7.90,固含量为49.3%,固化温度为129.5℃,常温下储存期大于90 d,与酚醛树脂(PF)相比,B-PF颜色浅,用其制备的改性材能够较好地保持木材原有的色泽和纹理;升温至700℃时B-PF的残重率达到73.0%,较PF提高25.86%;B-PF固含量在20%以上时,改性速生杨木阻燃性能从易燃提高至难燃等级,固含量为40%的B-PF改性速生杨木的氧指数为43.4%,较未处理材提高1.28倍。
关键词:  硼酸复配低分子酚醛树脂  速生杨木  阻燃性能
DOI:10.13610/j.cnki.1672-352x.20150626.008
投稿时间:2015-02-11
基金项目:国家自然科学基金(31100418), 国家林业公益性行业科研专项(201304504)和江苏省高校自然科学研究项目
Flame retardation of fast-growing poplar wood modified with low molecular weight boracic acid compounding phenol-formaldehyde resin
WANG Leilei,YUE Kong,LU Weidong,LIU Weiqing
(College of Civil Engineering, Nanjing Tech University, Nanjing 211816)
Abstract:
The thermal properties of low molecular weight boracic acid compounding phenol-formaldehyde resin(B-PF)were characterized with TGA and DSC, respectively. The B-PF’s effect on the fire retardancy of fast-growing poplar wood was studied. The results showed that the synthesized B-PF at the mole ratio of 1:1.9:0.3:0.3 (phenol: formaldehyde: boric acid: caustic soda) showed the characteristics of pH 7.90, solid content of 49.3%, curing temperature of 129.5℃, storage period >90 days, and light color, which can make the appearance of the B-PF treated fast-growing poplar wood being similar to the untreated. The residue weight percentage of B-PF was 73.0% at 700℃, which was 25.86% higher than that of PF. When the solid content of B-PF was above 20%, the flame retardancy reached to nonflammable compared with the inflammable level of the untreated. The oxygen index of the B-BF treated fast-growing wood was 43.4% that is 1.28 times higher than that of the untreated.
Key words:  boracic acid compounding phenol-formaldehyde resin  fast-growing poplar  flame retardancy

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