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采用碱液萃取法去除竹焦油中碱不溶性物质,制备竹焦油精制液;然后以此替代部分苯酚与甲醛聚合,制备PF(酚醛树脂)胶粘剂。采用正交试验法确定了精制竹焦油的最佳工艺条件,并采用GC/MS(气质联用)法分析其化学组成。研究结果表明:精制竹焦油的最佳工艺条件为萃取时间24 h、碱液浓度15.0%和m(碱液):m(竹焦油)=1.00:1;此时体系的萃取得率为54.09%、萃取液含水率为63.30%、萃取液与甲醛的反应活性为0.31 mol/100 g;精制竹焦油中酮类物质的相对含量从8.53%降至1.22%,其他物质的相对含量从33.40%降至24.30%,而酚类物质的相对含量比竹焦油原液提高了19.51%,并且酚类物质的反应活性优于竹焦油原液。
Alkali-liquid extraction method is used to remove alkali insoluble matter in bamboo tar to prepare bamboo tar refined liquid. Then, part of phenol and formaldehyde are polymerized to prepare PF (phenolic resin) adhesive. The optimum technological conditions of refined bamboo tar were determined by orthogonal test and the chemical composition was analyzed by GC / MS. The results showed that the best extraction conditions were: extraction time 24 h, concentration of lye 15.0% and m (lye): m (bamboo tar) = 1.00: 1. The extraction yield of the system was 54.09% , The moisture content of the extract was 63.30%, the reactivity of the extract with formaldehyde was 0.31 mol / 100 g; the relative content of ketones in purified bamboo tar decreased from 8.53% to 1.22%, and the relative contents of other substances decreased from 33.40% To 24.30%, while the relative content of phenols was 19.51% higher than that of bamboo tar, and the reactivity of phenols was better than that of bamboo tar.