[1]李萍,张源,左迎峰,等.硅酸盐仿生呼吸法改性杉木的工艺及性能[J].林业工程学报,2020,5(06):57-63.[doi:10.13360/j.issn.2096-1359.202002014]
 LI Ping,ZHANG Yuan,ZUO Yingfeng,et al.Properties of Chinese fir modified by impregnating silicate biomimetic respiration[J].Journal of Forestry Engineering,2020,5(06):57-63.[doi:10.13360/j.issn.2096-1359.202002014]
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硅酸盐仿生呼吸法改性杉木的工艺及性能()
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《林业工程学报》[ISSN:2096-1359/CN:32-1862/S]

卷:
5
期数:
2020年06期
页码:
57-63
栏目:
木材科学与技术
出版日期:
2020-11-01

文章信息/Info

Title:
Properties of Chinese fir modified by impregnating silicate biomimetic respiration
文章编号:
2096-1359(2020)06-0057-07
作者:
李萍1张源1左迎峰1吕建雄2王向军3吴义强1*
1.中南林业科技大学材料科学与工程学院,长沙410004;2.中国林业科学研究院木材工业研究所,北京100091;3.天盈(广东)木业科技有限公司,广东 江门529700
Author(s):
LI Ping1 ZHANG Yuan1 ZUO Yingfeng1 LYU Jianxiong2 WANG Xiangjun3 WU Yiqiang1*
1. College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China; 2. Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China; 3. Tianying (Guangdong) Wood Industry Technology Limited Company, Jiangmen 529700, Guangdong, China
关键词:
杉木木材改性硅酸盐仿生呼吸法物理力学性能耐热性能
Keywords:
Chinese fir wood modificationsilicate bionic respiration method physical and mechanical properties heat resistance
分类号:
S781.7
DOI:
10.13360/j.issn.2096-1359.202002014
文献标志码:
A
摘要:
杉木存在结构疏松、材质轻软、强度低等缺陷,对其进行浸渍改性是提高其性能的重要方法,然而传统有机树脂浸渍改性存在释放有毒害气体、易燃等危害人居环境安全的严重问题。鉴于此,采用无机物质对杉木进行浸渍改性可显著提高杉木力学性能、尺寸稳定性、阻燃抑烟等性能,实现低值杉木的高值化利用。以硅酸钠为浸渍改性剂,硫酸盐、钙盐和磷酸盐复配物为固化剂,通过仿生呼吸法制得硅酸盐改性杉木。探讨了硅酸钠模数、硅酸钠质量分数、浸渍压力、浸渍时间、呼吸次数和呼吸频率(负压时间/正压时间)对改性杉木质量增加率和力学性能的影响,并采用扫描电子显微镜(SEM)和热重分析仪(TGA)对其微观形貌和耐热性能进行了表征。结果表明,当硅酸钠模数为3.4、硅酸钠浓度为30%、浸渍压力为0.5 MPa,浸渍时间为3 h、呼吸次数为6次、呼吸频率为2∶4时,改性杉木的质量增加率、抗弯强度、抗压强度和三切面硬度均为最佳。经过硅酸盐仿生改性后,改性杉木的横切面和纵切面都被硅酸盐较好填充,这也是杉木力学性能提高的原因。TGA分析表明,与杉木素材相比,改性杉木的耐热性能显著提高。
Abstract:
Chinese fir has some major drawbacks, such as loose structure, light and soft, low strength, etc. Impregnation modification is an important method to improve its properties. However, the traditional organic resin impregnation modification had the serious problems of releasing toxic gas, inflammable, etc. In view of this, the mechanical properties, dimensional stability, fire resistance and smoke suppression of Chinese fir can be significantly improved by impregnation of inorganic materials, which can convert low grade Chinese fir into the high value wood products. The silicate modified Chinese fir was prepared by the bionic respiration method, in which, sodium silicates were used as the impregnating modifier, and the compound of sulfate, calcium salt and phosphate were as the curing agents. The effects of sodium silicate modulus, sodium silicate concentration, impregnation pressure, impregnation time, breathing times and respiration rate (negative pressure time/positive pressure time) on the weight percentage gain and mechanical properties of modified Chinese fir were studied. The micro morphology and heat resistance of the modified wood were characterized by the scanning electron microscopy (SEM) and thermogravimetry (TGA). The results showed that, when the sodium silicate modulus was 3.4, the sodium silicate concentration was 30%, the impregnation pressure was 0.5 MPa, the impregnation time was 3 h, the breaths time was 6 times, and the respiration rate was 2∶4, the weight percentage gain, bending strength, compressive strength and three section hardness of the modified Chinese fir were the best. After the silicate biomimetic modification, the transverse section and longitudinal section of the modified Chinese fir were filled with silicates, which was also the reason for the improvement of the mechanical properties of Chinese fir. The TGA analysis showed that the heat resistance of the modified Chinese fir was significantly improved compared with that of unmodified Chinese fir.

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备注/Memo

备注/Memo:
收稿日期:2020-02-21? ? ?修回日期:2020-05-19
基金项目:湖南省科技重大专项(2017NK1010);湖湘青年英才计划(2019RS2040);国家自然科学基金项目(31770606);湖南省研究生科研创新项目(CX20190600)。
作者简介:李萍,女,讲师,博士生,研究方向为木材功能性改良。通信作者:吴义强,男,教授。E-mail:wuyq0506@126.com
更新日期/Last Update: 2020-11-11