华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (11): 81-85,90.

• 化学化工 • 上一篇    下一篇

环氧聚氨酯乳液的黏度和稳定性

皮丕辉 许振苗 文秀芳 程江 杨卓如   

  1. 华南理工大学 化工与能源学院,广东 广州 510640
  • 收稿日期:2007-01-12 出版日期:2007-11-25 发布日期:2007-11-25
  • 通信作者: 皮丕辉(1973-) ,男,博士,讲师,主要从事精细化工过程与产品开发研究. E-mail:phpi@scut. edu.cn
  • 作者简介:皮丕辉(1973-) ,男,博士,讲师,主要从事精细化工过程与产品开发研究.

Viscosity and Stability of Epoxy-Polyurethane Emulsion

Pi Pi-hui  Xu Zhen-miao  Wen Xiu-fang  Cheng Jiang  Yang Zhuo-ru   

  1. School of Chemical and Energy Engineering, South China Univ. of Tech. , Guangzhou 510640 , Guangdong, China
  • Received:2007-01-12 Online:2007-11-25 Published:2007-11-25
  • Contact: 皮丕辉(1973-) ,男,博士,讲师,主要从事精细化工过程与产品开发研究. E-mail:phpi@scut. edu.cn
  • About author:皮丕辉(1973-) ,男,博士,讲师,主要从事精细化工过程与产品开发研究.

摘要: 采用聚酰胺对环氧树脂进行扩链后并进行阳离子化改性,共混入聚氨酯固化剂,用外加乳化剂进行相反转,制得了环氧聚氨酯乳液,研究了溶剂用量及溶剂配比、改性环氧树脂相对分子质量大小、水溶性及固化剂用量等对乳液黏度和稳定性的影响.实验发现:树脂体系中溶剂量存在一临界值为8.8%( 质量分数,下同) ,当溶剂量高于8.8% 时,较难发生相反转,制得的乳液不稳定;当溶剂用量低于8.8% 时,能发生相反转,且乳液稳定性好;疏水性的二甲苯部分代替亲水性的乙二醇单丁醚,能显著降低改性环氧树脂的黏度和最终乳液的崭度.当聚眈膀用量为环氧树脂用量的6.0% -6.5% 时,中和度达65q毛,改性环氧树脂水溶性较好;控制固化剂量为改性环氧树脂量的15. 0% - 20. 0% 时,制得的乳液稳定性好.

关键词: 环氧聚氨酯乳液, 相反转, 黏度, 稳定性

Abstract:

A kind of epoxy resin was chain-extended hy polyamide , cationic-modified , hlended with curing agent of polyurethane , and then emulsified hy means of phase inversion. Thus,an epoxy-polyurethane emulsion was prepared. The viscosity and stahility of the emulsion were then investigated with such difIerent parameters as the solvent dosage and mixing ratio , the relative molecular mass of the modified epoxy resin , the water soluhility and the curing agent dosage. It is found from experiments that the mass fraction of the solvent in resin has a critical value of 8.8%. When the solvent dosage is more than 8.8% , the phase inversion is difficultωoccur and the prepared emulsion is unstahle. On the contrary , this is possihle when the dosage is less than 8. 8%. Moreover, it is indicated that , as the water-soluhle solvent of ethylene glycel mono-hutyl ether is partly suhstituted hy the hydrophohic solvent of xylene , the viscosities of the resin and the emulsion hoth greatly decrease ,that the modified epoxy resin is easily soluhle when the polyamide dosage is 6.0% - 6.5% that of epoxy resin and the neutralization degree is 65 % , and that the prepared emulsion is very stahle in a curing agent dosage of 15. 0% - 20. 0% .

Key words: epoxy-polyurethane emulsion, phase inversion, viscosity, stahility