胺改性酚醛树脂的合成及应用研究

SYNTHESES AND APPLICATION OF PHENOL-FORMALDEHYDE RESIN MODIFIED WITH AMINES

利用二甲胺和异丙胺在合适的条件下对酚醛树脂进行改性,得到了两类不同的阳离子型酚醛树脂(CPFR).将其与聚氧化乙烯(PEO)组成双元助留体系,应用于脱墨废纸浆抄纸工艺.实验结果表明,该体系能显著提高细小组分的一次留着率,使其达到90 %以上.而影响PEO-CPFR体系效果的因素主要有助留剂的用量、PEO与CPFR的比值、纸料体系的pH值、剪切力等.该体系的最佳应用条件为PEO用量0.02 %～0.04 %,PEO与CPFR的比为1∶6～1∶12,pH值4～9,能耐受剪切力为400～1 000 r/min转速转子的剪切.

Syntheses of phenol-formaldehyde resin （PFR） modified with dimethylamine and isopropylamine respectively under suitable conditions were investigated. Cationic phenol-formaldehyde resins （CPFR）and polyethylene oxide（PEO）eomprised a binary retention system which was used for deinked pulp of waste paper. The results showed that the retention system could improve the retention of micro-fibers and fillers remarkably, and the first pulp retention could be achieved more than 90 %. Effects on the retention system composed of PEO and CPFR were affected by dosages of retention aids, ratio of PEO-CPFR, pH value of pulp and shearing stress, etc. The optimal conditions of the system were as follows： dosage of PEO 0.02 % -0.04 % , ratio of PEO-CPFR 1：6 -1：12, pH value 4 - 9. The system can endure shearing stress of rotor at 400 - 1 000 r/min.