摘要
为了提高人工林杨木的物理力学性能和阻燃性能,采用低分子量三聚氰胺脲醛(MUF)树脂复合一定比例的硅酸钠溶液,制备出树脂型硅酸盐改性剂,对人工林杨木进行真空加压浸渍处理,以改性杨木增重率为评价指标,得到较优化的浸渍处理工艺:抽真空至-0.095MPa,保持30min,施加压力0.8MPa保持2h,木材增重率达到60%左右;通过分析不同配比改性剂的性能及其对改性杨木各项物理力学性能和燃烧性能的影响,优选出MUF树脂复合30%硅酸钠制备的改性剂,对木材的改性效果最佳,可使杨木密度由未处理材的0.39g/cm^3提高到0.55g/cm^3,抗胀率达到51.5%,弹性模量和抗弯强度比未处理材分别提高35.9%和59.4%,氧指数达到57%,比未处理材提高119.2%。
In this study, low molecular weight melamine-urea-formaldehyde （MUF） resin containing various level of sodium silicate solution was used to impregnate plantation wood of poplar by vacuum-pressure method in order to improve its physical and mechanical properties and flame retardancy. The weight gain percentage （WPG） was used to evaluate the efficiency of impregnation. The physical, mechanical properties as well as the flame retardancy of the impregnated wood obtained at different impregnation conditions were investigated. The optimal weight gain percentage （WPG） could reach up to 60% by applying vacuum at -0.095Mpa for 30min first, and then applying pressure at 0.8Mpa for 2h during the impregnation. MUF resin containing 30% sodium silicate was found to be the most effective modifier. The impregnated wood had a density of 0.55g/cm^3 （0.39g/cm^3 for untreated wood） and anti-swelling efficiency of 51.5%. Compared to the untreated wood, the modulus of elastic and ftexural strength of the impregnated wood were improved 35.9% and 59.4%, respectively. The oxygen index of the impregnated wood was 57%, which was 119.2% higher than that of the untreated wood.
作者
王飞
柴宇博
刘君良
WANG Fei CHAI Yu-bo LIU Jun-liang(Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing 100091, China)
出处
《木材加工机械》
2016年第4期33-36,58,共5页
Wood Processing Machinery
基金
林业公益性行业科研专项经费"实木家具用低质材提质加工技术研究与示范"(201404501)
中央级公益性科研院所基本科研业务费专项资金"树脂型硅酸盐改性人工林杨木技术研究"(CAFINT2013K02)
