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改性酚醛树脂的制备及其在抄纸中的应用研究-刘站-2007

2013年06月17日 11:52 刘站 点击:[]

 

 作者姓名  刘站
 中文论文题名  改性酚醛树脂的制备及其在抄纸中的应用研究
 外文论文题名  THE PREPARATION OF MODIFIED PFR AND THE APPLICATION OF THE RESIN IN PAPERMAKING PROCESS
 论文提交日期  2007-05-20
 学位年度  2007
 中文论文关键词  OCC废纸浆,改性酚醛树脂,增强剂,抗张指数,环压指数,增强机理
 外文论文关键词  OCC pulp,Modified phenol-formaldehyde resin, Intensifier, Tensile index, Ring crush index,strengthen mechanism

 

中文论文文摘


    由改性的酚醛树脂组成的多元助留助滤体系在造纸过程中的应用,已经有了很多的研究,而改性的酚醛树脂能否单独或组成多元体系应用于纸张的增强方面的研究,还未见资料报道。因此,研究不同取代基的酚醛树脂的特性及其对纸张的增强机理,对改性酚醛树脂的生产和使用有重要的理论指导意义。
    本文通过苯酚、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,并研究了将改性的酚醛树脂作为造纸增强剂应用在抄纸过程中。
通过对改性酚醛树脂的制备的研究,考察了反应温度、反应时间、原料配比、催化剂对改性酚醛树脂的影响。实验结果表明,以二乙烯三胺为改性剂时,制备改性酚醛树脂的最佳实验条件是:苯酚﹕甲醛﹕二乙烯三胺(摩尔比)为1﹕0.8﹕0.015;反应的最高温度为95~105℃;反应时间2h。并在此基础上合成出改性酚醛树脂,采用红外光谱图对改性产物进行了表征。
    通过对改性酚醛树脂在OCC废纸浆中的应用研究,考察了二乙烯三胺和三乙胺改性酚醛树脂在OCC废纸浆中的应用效果,并通过单因素实验得到了改性酚醛树脂的最佳应用效果。实验结果表明,二乙烯三胺改性的酚醛树脂单独作用于OCC废纸浆时(用量为1.0%),抗张指数和环压指数分别增加了15.90%和9.65%,当加入阳离子淀粉时(用量为1.0%),抗张指数和环压指数分别增加了32.81%和29.29%。通过对二乙烯三胺改性酚醛树脂和阳离子淀粉用量的优化,得出了最佳的应用条件,即改性酚醛树脂和阳离子淀粉的用量分别为0.3%和0.7%,此时手抄片的抗张指数和环压指数分别增加了35.28%和26.50%。三乙胺改性的酚醛树脂和阳离子共同使用时,对手抄片也有增强效果。通过对三乙胺改性酚醛树脂和阳离子淀粉用量的优化,得出改性酚醛树脂和阳离子淀粉的最佳用量分别为0.5%和0.8%,此时手抄片的抗张指数和环压指数分别增加了21.83%和23.52%。综合考察二乙烯三胺和三乙胺改性的酚醛树脂的增强作用,二乙烯三胺作为改性剂时改性的酚醛树脂要优于三乙胺改性的酚醛树脂。由改性酚醛树脂和阳离子淀粉的交联实验可知,当阳离子淀粉和改性酚醛树脂的用量比(质量)为1﹕4、交联温度为70℃时,纸张的抗张指数和环压指数分别提高了31.27%和27.22%。
    在改性酚醛树脂增强机理的研究中,通过对单独加入阳离子淀粉和先加入改性酚醛树脂后加入阳离子淀粉时浆料的Zeta电位的测定,阐述了阳离子淀粉和改性酚醛树脂加入对浆料Zeta电位及成纸强度影响的原因。由扫描电镜对成纸表面和裂断面的分析可知,加入阳离子淀粉和改性酚醛树脂,增加了纤维与纤维之间的结合。

 

外文论文文摘


    It had reported that modified phenol-formaldehyde resin was used in papermaking as retention and drainage aids, however, it hadn’t reported that whether the modified phenol-formaldehyde resin could be used in papermaking as intensifier. So, reseaching the characteristics of the phenol-formaldehyde resin with different substituents and the strengthen mechanism of the resin to paper would have great theoretic and guidance significance to produce and use the modified phenol-formaldehyde resin.
    An anionic phenol-formaldehyde resin which synthesized by phenol, formaldehyde and some amine compound such as diethylamine, triethylamine and diethylene triamine was studied in this paper, and this modified phenol-formaldehyde resin was used in papermaking as an intensifier.
    In the preparation of modified phenol-formaldehyde resin, the influence was studied on modified phenol-formaldehyde resin with reaction temperature、reaction time、composition of furnish and catalyst. It has shown that the optimum condition to modify phenol-formaldehyde resin were phenol﹕formaldehyde﹕diethylene triamine(molar ratio) 1﹕0.8﹕0.015, reaction temperature 95~105℃ and reaction time 2h, when using diethylene triamine as modifying agent. Under this condition, modified phenol-formaldehyde resin was synthesized and analyzed through the IR spectrum.
    In application of modified phenol-formaldehyde resin in OCC pulp, firstly the application effictiveness of phenol-formaldehyde resin modified by triethylamine and diethylene triamine in OCC pulp was researched, and the optimum application effictiveness was gotten through mon- factor trial. It has shown that the tensile index and ring crush index of handsheets were increased by 15.90% and 9.65%, when phenol-formaldehyde resin modified by diethylene triamine was used in OCC pulp alone (the dosage of resin was 1.0%), and then adding cationic starch to pulp (the dosage of starch was 1.0%), the tensile index and ring crush index of handsheets were increased by 32.81% and 29.29%. Through the optimizing trial, the dosage of modified phenol-formaldehyde resin and cationic starch were gotten, and the optimum dosage of modified phenol-formaldehyde resin and cationic starch were 0.3% and 0.7%, and then, tensile index and ring crush index were increased by 35.28% and 26.50%.
    There had strength enhancing efficiency when adding modified resin and cationic starch to pulp. Through the optimizing trial, the dosage of phenol-formaldehyde resin modified by triethylamine and cationic starch were gotten, and the optimum dosage of modified phenol-formaldehyde resin and cationic starch were 0.5% and 0.8%, and then, tensile index and ring crush index were increased by 21.83% and 23.52%. Considering the strength enhancing efficiency of phenol-formaldehyde resin modified by triethylamine and diethylene triamine in OCC pulp, the efficiency of phenol-formaldehyde resin modified by diethylene triamine was better than triethylamine. From the crosslinking trial of cationic starch and modified phenol-formaldehyde resin, the tensile index and ring crush index of handsheets were increased by 31.27% and 27.22%, when the mass ratio of cationic starch and modified phenol-formaldehyde resin was 1﹕4、crosslinking temperature was 70℃.
    In study on strengthen mechanism of modified phenol-formaldehyde resin,through measuring the Zeta potential of pulp with two ways by adding cationic starch alone and adding modified phenol-formaldehyde resin firstly then adding cationic starch, the reason of the influence in Zeta potential of pulp and strength of paper was expounded when adding cationic starch and modified phenol-formaldehyde resin. From the analysis on scanning electronic microscope to the rupture and surface of the paper, cationic starch and modified phenol-formaldehyde resin could increase the combination of fibers.
    

 

 

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