水性双组分高光聚氨酯涂料适用期测试方法研究

涂料工业 ›› 2016, Vol. 46 ›› Issue (10): 62-67.

水性双组分高光聚氨酯涂料适用期测试方法研究

许乾慰¹，张鑫¹，张之涵²，沈剑平²，徐娜²

1、同济大学材料科学与工程学院；2、科思创聚合物(中国)有限公司

出版日期:2016-10-01 发布日期:2019-05-31
作者简介:许乾慰(1960—)，男，博士，博士生导师，长期从事高分子材料的教学与研究工作。

Study on Testing Methods for Pot Life of Two Component Waterborne Polyurethane

Xu Qianwei¹, Zhang Xin¹, Zhang Zhihan², Shen Jianping², Xu Na²

1. School of Materials Science and Engineering of Tongji Unirersity, Shanghai 201804, China;2. Covestro Polymers( China)Co., Ld, Shanghai 201206, China

Online:2016-10-01 Published:2019-05-31

摘要/Abstract

摘要： 通过持续检测亲水型多异氰酸酯聚合物中的—NCO基团含量在水性体系中的变化情况、液态双组分涂料添加固化剂后的黏度变化情况,并检测涂膜固化后的硬度、光泽、雾影、耐化性等方法,研究了羟基丙烯酸乳液CA42、羟基丙烯酸二级分散体CA70和羟基聚氨酯分散体CU55这3种树脂与磺酸盐改性HDI三聚体CH655固化剂按照一定物质的量比配制的双组分水性聚氨酯涂料在一定条件下的适用期,并试图建立一套用于确定3种体系适用期的测定方法。结果表明:CA42体系的雾影值在5~6 h增长478.7%;CU55体系的雾影值在4~5 h增长313.1%;CA70摆杆硬度在6~7 h的1 h内下降12%,得出CA42、CA70、CU55这3个体系的适用期分别为5 h、6 h和4 h,根据3个体系适用期长短,计算其在适用期内异氰酸根浓度的下降值分别为34.1%、36.9%和31.2%,可以看出异氰酸根大约消耗30%就会达到适用期的极限。而通过光泽、耐化学品性、黏度、粒径均不能判断适用期长短。

关键词: 水性双组分聚氨酯, 雾影, 光泽, 粒径, 适用期

Abstract: The pot life of the two component waterborne polyurethane in which three different genre resin CA42, CA70 and CU55 are mixed with sulfonate modified HDI trimer curing agent CH655 at a certain molar ratio were investigated through observing changes of content of NCO group of hydrophilic polyisocyanate polymers in aqueous system, variations of two component waterborne polyurethane coatings when mingled with curing agent, as well as transform of hardness, gloss, haze, viscosity, chemical resistance of the cured coating film, etc. In addition, a series of methods of determining a suitable pot life of the three systems are established. The result indicates that there is a significant change of haze value of the CA42 system and CU55 system, giving an increase by 478. 7%o in 5~6 h and 313. 1% in 4~5 h respectively. There is also a remarkable change of the pendulum hardness of CA70 system, giving a decrease by 12% within I h in the range of 6-7 h. Consequently, observation of change of haze and pendulum hardness could acquire the pot life of he CA42, CA70 and CU553syS-tems which is 5 h, 6 h and 4 h respectively. The concentration of isocyanate group is decreased by 34. 1%o during the pot life of CA42, 36.9% during the pot life of CA70,and 31.39% during the pot life of CU55, which shows that the limit of the pot life might occur if the isocyanate group is consumed 30%. However, the gloss, chemical resistance, viscosIty, partlcle size can not determine the length of pot life.

Key words: two component waterborne polyurethane, haze, gloss, particle size, pot life

许乾慰, 张鑫, 张之涵, 沈剑平, 徐娜. 水性双组分高光聚氨酯涂料适用期测试方法研究[J]. 涂料工业, 2016, 46(10): 62-67.

Xu Qianwei, Zhang Xin, Zhang Zhihan, Shen Jianping, Xu Na. Study on Testing Methods for Pot Life of Two Component Waterborne Polyurethane[J]. Paint & Coatings Industry, 2016, 46(10): 62-67.

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