摘要
毛竹加工通常伴随剩余物产生,为提高毛竹利用率,解决添加胶结剂板材释放甲醛等有害物质等问题,提出一种竹制建筑装饰自结合成形板材的制备技术。该技术主要以毛竹加工剩余物为原料,经过机械粉磨和热压成形等手段,研究粒径配比、热压温度对竹制自结合成形板材力学性能、耐水性能的影响。结合SEM微观分析,验证了高温热压对板材性能提高的作用机理。结果表明:随着粉磨时间的增加,120目以上细小颗粒的占比逐渐增大;相比于粒径级配,热压温度对板材内胶合强度的影响更为显著,相比于140℃热压,200℃热压条件制备的板材内胶合强度提高了75.3%;同时,相比于性能最差的试验组,其静曲强度和弹性模量分别提高了158.8%和160.3%。此外,高温热压板材的耐水性同样得到提高。因此,高温条件热压和竹粉适当粉磨预处理,能更好地提高竹制板材的自结合性能。
To improve the utilization rate of Moso bamboo and address the issue of harmful substance release,such as formaldehyde,from sheets with added cementing agents,a preparation technique for self-bonding bamboo sheets for architectural decoration is proposed.This technique primarily utilizes bamboo processing residues,involving mechanical grinding and hot pressing.The effects of particle size distribution and hot pressing temperature on the mechanical properties and water resistance of the bamboo self-bonding sheet are studied.Combined with SEM microanalysis,the mechanism by which high-temperature hot pressing improves sheet performance is verified.Results show that as grinding time increases,the proportion of fine particles above 120 mesh gradually rises.Compared to particle size distribution,the effect of hot pressing temperature on internal bonding strength is more pronounced.The internal bonding strength of sheets pressed at 200℃increases by 75.3%compared to those pressed at 140℃.Additionally,static bending strength and elastic modulus increase by 158.8%and 160.3%,respectively,in the best-performing group compared to the worst.The water resistance of high-temperature hot-pressed sheets is also enhanced.Thus,hot pressing under high temperature combined with appropriate grinding pretreatment of bamboo powder effectively improves the self-bonding performance of bamboo sheets.
作者
金忠宇
郭松林
JIN Zhongyu;GUO Songlin(China Construction Second Bureau Decoration Engineering Co.,Ltd.,Beijing 101101,China)
出处
《建筑施工》
2024年第12期1967-1970,共4页
Building Construction
关键词
竹材
无胶板材
热压成形
力学性能
微观形貌
bamboo
adhesive-free sheet
hot-pressing forming
mechanical properties
micro-morphology
