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本论文通过苯酚、甲醛与胺类化合物(二乙胺、三乙胺、二乙烯三胺)反应,得到阴离子性的酚醛树脂,并将改性的酚醛树脂作为造纸增强剂应用在抄纸过程中。试验结果表明,二乙烯三胺改性的酚醛树脂的增强效果要优于其它两种胺类化合物;单独加入改性酚醛树脂的增强效果不明显,当和阳离子淀粉同时使用时,抗张指数和环压指数有很大的提高,其中,当改性酚醛树脂和阳离子淀粉的用量均为1.0%(对绝干浆)时,抗张指数和环压指数分别增加了32.81%和29.29%;通过正交试验,对改性酚醛树脂的条件进行了优化,最终确定了最佳的改性条件(即甲醛用量10.95g,二乙烯三胺用量0.30g,最高温度95～105℃,总反应时间2.5h),并在最佳条件下合成出性能稳定、水溶性的酚醛树脂;通过应用试验,得出改性酚醛树脂和阳离子淀粉的最佳用量分别为0.3%和0.7%。
In this thesis, phenol, formaldehyde and amine compounds (diethylamine, triethylamine, diethylenetriamine) are reacted to obtain anionic phenolic resin, and the modified phenolic resin is used as papermaking enhancer in the papermaking process . The experimental results show that the diethylenetriamine modified phenolic resin is better than the other two amines; the addition of modified phenolic resin alone has no obvious enhancement effect. When used with cationic starch, the tensile index and The ring pressure index increased greatly. When the content of modified phenolic resin and cationic starch were both 1.0% (on dry pulp), the tensile index and ring pressure index increased by 32.81% and 29.29% respectively; Orthogonal test, the conditions of the modified phenolic resin were optimized, and finally the best modification conditions were determined (that is, formaldehyde dosage 10.95g, diethylenetriamine dosage 0.30g, maximum temperature 95 ~ 105 ℃, total reaction time 2.5 h), and the stable and water-soluble phenolic resin was synthesized under the optimal conditions. The best dosage of modified phenolic resin and cationic starch was 0.3% and 0.7% respectively through the application test.