高温热处理对UF树脂改性杉木力学强度的影响
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摘要
本研究以脲醛(UF)树脂改性杉木为研究对象,采用高温过热蒸汽对其进行热处理,系统研究了热处理温度和时间对UF树脂改性杉木力学强度的影响规律。结果表明:与杉木对照材相比,UF树脂改性杉木力学强度显著提高;高温热处理使杉木浸渍材的力学强度降低;随着温度升高和时间延长,杉木浸渍材的抗弯弹性模量和强度、顺纹抗压强度和横纹抗压比例极限应力均呈明显下降趋势;经热处理后,UF改性杉木抗弯弹性模量、抗弯强度、顺纹抗压强度最大分别可降低11.4%、65.1%和17.3%,横纹全部弦向和径向抗压比例极限应力最大分别可降低60.9%和59.6%,横纹局部弦向和径向抗压比例极限应力最大分别可降低36.5%和56.5%。
The UF resin modified Chinese fir was treated in the high temperature superheated steam to investigate the effects of temperature and processing time on wood properties. The results show that the mechanical properties of the Chinese fir were improved after UF resin impregnation. The mechanical properties of the UF resin modified Chinese fir decreased after high-temperature heat treatment. With the increase of temperature and the extension of time, the bending MOE, MOR, the compressive strength to the grain and stress at proportional limit perpendicular to the grain of Chinese fir were all decreased. After heat treatment, compared with the untreated UF resin modified Chinese fir, the bending MOE and MOR, the compressive strength of the grain of the modified wood was reduced by 11.4%, 65.1%, 17.3% to the maximum extent, respectively, tangential and radial overall compressive stress at proportional limit perpendicular to the grain of the modified wood was reduced by 60.9%, 59.6% to the maximum extent, respectively. The tangential and radial local compressive stress at proportional limit perpendicular to the grain of the modified wood was reduced by 36.5%, 56.5% to the maximum extent, respectively.
The UF resin modified Chinese fir was treated in the high temperature superheated steam to investigate the effects of temperature and processing time on wood properties. The results show that the mechanical properties of the Chinese fir were improved after UF resin impregnation. The mechanical properties of the UF resin modified Chinese fir decreased after high-temperature heat treatment. With the increase of temperature and the extension of time, the bending MOE, MOR, the compressive strength to the grain and stress at proportional limit perpendicular to the grain of Chinese fir were all decreased. After heat treatment, compared with the untreated UF resin modified Chinese fir, the bending MOE and MOR, the compressive strength of the grain of the modified wood was reduced by 11.4%, 65.1%, 17.3% to the maximum extent, respectively, tangential and radial overall compressive stress at proportional limit perpendicular to the grain of the modified wood was reduced by 60.9%, 59.6% to the maximum extent, respectively. The tangential and radial local compressive stress at proportional limit perpendicular to the grain of the modified wood was reduced by 36.5%, 56.5% to the maximum extent, respectively.
引文
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[24]刘一星,赵广杰.木材学[M].北京:中国林业出版社,2012.
[2]刘喻娟,李重根,郭杰文,等.速生杉木甲基丙烯酸甲酯改性及材性研究[J].华南农业大学学报,2011,32(4):116-118.
[3]王向歌,金菊婉,邓玉和,等.不同固含量低分子酚醛树脂浸渍改性杉木板材性能的研究[J].西南林业大学学报,2014,34(3):84-88.
[4]彭万喜,吴义强,张仲凤,等.中国的杉木研究现状与发展途径[J].世界林业研究,2006,19(5):54-58.
[5]龙传文,龙博,韦文榜.PF树脂对杉木浸渍与压缩工艺的研究[J].中国胶粘剂,2008,17(4):27-29.
[6]汪佑宏,顾炼百,刘启明,等.三聚氰胺改性脲醛对马尾松速生材性质影响[J].南京林业大学学报(自然科学版),201135(1):67-70.
[7]陈敏杰,张振伟,涂登云,等.热处理浸渍杨木性能研究[J].西北农林科技大学学报(自然科学版),2017,45(1):99-104,111.
[8]李龙哲,阳财喜,宋作梅,等.桉树木材的浸渍增强热处理技术[J].木材工业,2009,23(3):40-42.
[9]袁佳.杉木高温炭化改性技术的初步研究[D].长沙:中南林业科技大学,2010.
[10]孙娟.杉木、马尾松细观力学性能及热处理材性能研究[D].呼和浩特:内蒙古农业大学,2009.
[11]邓邵平,江茂生,陈孝云,等.杉木间伐材高温热处理后化学成分的变化[J].林业科学,2009,45(11):121-126.
[12]邓邵平,杨文斌,陈瑞英,等.人工林杉木木材力学性质对高温热处理条件变化的响应[J].林业科学,2009,45(12):105-111.
[13]李延军,唐荣强,鲍滨福,等.高温热处理杉木力学性能与尺寸稳定性研究[J].北京林业大学学报,2010,32(4):232-236.
[14]邓邵平,陈寒娴,林金春,等.高温热处理人工林杉木木材的材色和涂饰性能[J].福建农林大学学报(自然科学版),2010,39(5):484-489.
[15]李贤军,傅峰,蔡智勇,等.高温热处理对木材吸湿性和尺寸稳定性的影响[J].中南林业科技大学学报,2010,30(6):92-96.
[16]陈泽君,王勇,马芳,等.高温热处理对人工林杨木物理力学性能和尺寸稳定性的影响[J].中南林业科技大学学报,2012,32(6):142-145.
[17]中国国家技术监督局.GB/T1929-2009木材物理力学试件锯解及试样截取方法[S].北京:中国标准出版社,2009.
[18]中国国家技术监督局.GB/T1936.2-2009木材抗弯弹性模量测定方法[S].北京:中国标准出版社,2009.
[19]中国国家技术监督局.GB/T1936.1-2009木材抗弯强度试验方法[S].北京:中国标准出版社,2009.
[20]中国国家技术监督局.GB/T1939-2009木材横纹抗压试验方法[S].北京:中国标准出版社,2009.
[21]中国国家技术监督局.GB/T1935-2009木材顺纹抗压强度试验方法[S].北京:中国标准出版社,2009.
[22]丁涛,贝政廷,李源.杉木热处理材结晶度及力学性能的研究[J].林业科技开发,2012,26(02):23-26.
[23]Adya P.Singh,Valerio Causin,Arif Nuryawan,et al.Morphological,Chemical and Crystalline Features of UreaFormaldehyde Resin Cured in Contact with Wood[J].European Polymer Journal,2014,56(1):185-193.
[24]刘一星,赵广杰.木材学[M].北京:中国林业出版社,2012.