PF树脂对二种单板浸渍改性的比较研究

Comparative research on impregnation modification of two kinds of veneer with PF resin

为提高混凝土模板用胶合板的表面耐磨性,采用浸渍方法,在常温、常压下用PF树脂胶液对杨木和马尾松单板进行了改性处理,对胶液种类、浸渍时间与单板增重率、表面磨耗值之间的关系进行了研究,探讨了提高单板表面耐磨性的合适工艺。研究结果表明,单板经浸渍处理后,胶黏剂主要分布在单板表层,随浸渍时间延长,二种单板的增重率呈上升趋势,表面磨耗值呈下降趋势。当浸渍时间相同时,加入耐磨剂的PF树脂胶液,可显著提高单板的表面耐磨性,碳化硅的耐磨性比二氧化硅更明显,杨木单板的表面耐磨性优于马尾松单板。验证试验表明,PF树脂中加入0.4%的碳化硅、0.1%的海藻酸钠和3.5%的微晶纤维素,杨木单板浸渍3 h,马尾松单板浸渍5 h,二者的表面耐磨性可显著提高。

In order to increase surface abrasive resistance of plywood for concrete-form, Poplar and Masson pine veneer, at normal temperature and normal pressure, were processed with PF resin through impregnation. The relationship among resin kinds, impregnation time and weight gain rate, surface abrasive resistance of veneer was researched, and the suitable technology for increasing surface abrasive resistance of veneer was investigated. The research results indicated that resin distributed mainly on the surface layer of the veneer processed with PF resin, and that the weight gain rate of two veneers increased, surface abrasive resistance decreased with lengthening impregnation time. The PF resin mixed anti-wear agent could increased notably the surface abrasive resistance of veneer, and the abrasive resistance of silicon carbide was better than that of silica, and the abrasive resistance was better the impregnated Poplar than the Masson pine. Verification test indicated that the surface abrasive resistance of Poplar and Masson pine veneer could increase notably when 0.4% silicon carbide, 0.1% sodium alginate and 3.5% microcrystalline cellulose were mixed in PF resin, and Poplar and Masson pine veneer were respectively impregnated three hours and five hours.