二乙醇胺对环氧阴极电泳涂料固化温度的影响
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摘要
在环氧阴极电泳涂料的生产过程中,采用胺对环氧基团开环是重要的一步反应。由开环反应得到的羟基,在一定温度下与封闭异氰酸酯发生交联反应,得到坚韧耐用、满足各项需求的电泳漆漆膜。本研究针对二乙醇胺用量对环氧阴极电泳涂料固化温度的影响进行研究,发现在其他条件完全相同的情况下,随着二乙醇胺用量的增加,漆膜的固化温度会逐渐降低。当环氧基:二乙醇胺=2∶1(物质的量的比)时,固化温度为145℃;当环氧基:二乙醇胺=1.8∶1时,固化温度140℃;环氧基:二乙醇胺=1.5∶1时,固化温度可低至130℃。进一步提高二乙醇胺用量,则会影响最终的乳化效果,对乳液稳定性产生负面影响。
A ste of using amine to conduct an ring-opening reaction of the epoxy group is improtant during the production of epoxy cathodic electrodepostiton coatings.The hydroxyl group obtained from the ring-opening reaction is reacted with the block isocyanate at the processed temperature to form a electrodeposition film with toughness and good comprehensive properties.In this article,the effect of diethanolamine dosage on the curing temperature of the epxoy cathodic electrodepostion coatings has been investigated.The results show that the increase of diethanolamine dosage might lead to the decrease of the curing temperature.Specifically,the curing temperatue is 145 ℃,140℃ and 130 ℃ respectively when the mol ratio of epoxy group and diethanolamine is 2:1,1.8:1 and 1.5:1 respectively.Meanwhile,higher dosage of diethanolamine gives an negative effect on emulsifying efficiency and emulsion stability.
A ste of using amine to conduct an ring-opening reaction of the epoxy group is improtant during the production of epoxy cathodic electrodepostiton coatings.The hydroxyl group obtained from the ring-opening reaction is reacted with the block isocyanate at the processed temperature to form a electrodeposition film with toughness and good comprehensive properties.In this article,the effect of diethanolamine dosage on the curing temperature of the epxoy cathodic electrodepostion coatings has been investigated.The results show that the increase of diethanolamine dosage might lead to the decrease of the curing temperature.Specifically,the curing temperatue is 145 ℃,140℃ and 130 ℃ respectively when the mol ratio of epoxy group and diethanolamine is 2:1,1.8:1 and 1.5:1 respectively.Meanwhile,higher dosage of diethanolamine gives an negative effect on emulsifying efficiency and emulsion stability.
引文
[1]宋华.电泳涂装技术[M].北京:机械工业出版社,2008.
[2]王海侨,张燕,李效玉.丙烯酸酯改性环氧阴极电泳涂料的研究[J].涂料工业,2006,36(6),11-20.
[3]李田霞,陈存华,陈峰.环氧阴极电泳涂料的制备及电泳涂装过程的探讨[J].涂料工业,2007,37(6),13-22.
[4]于俊元,王朝阳,任碧野,等.聚四氟乙烯改性环氧阴极电泳涂料的研究[J].涂料工业,2004,34(1),5-8.
[5]李田霞,陈峰.有机氟改性环氧丙烯酸阴极电泳涂料的研究[J].涂料工业,2012,42(1),28-31.
[6]DOUGLAS A.WICKS,ZENO W.WICKS JR.Blocked isocyanates III:Part A.Mechanisms and chemistry.Progress in Organic Coating[J].36(1999),148-172.
[2]王海侨,张燕,李效玉.丙烯酸酯改性环氧阴极电泳涂料的研究[J].涂料工业,2006,36(6),11-20.
[3]李田霞,陈存华,陈峰.环氧阴极电泳涂料的制备及电泳涂装过程的探讨[J].涂料工业,2007,37(6),13-22.
[4]于俊元,王朝阳,任碧野,等.聚四氟乙烯改性环氧阴极电泳涂料的研究[J].涂料工业,2004,34(1),5-8.
[5]李田霞,陈峰.有机氟改性环氧丙烯酸阴极电泳涂料的研究[J].涂料工业,2012,42(1),28-31.
[6]DOUGLAS A.WICKS,ZENO W.WICKS JR.Blocked isocyanates III:Part A.Mechanisms and chemistry.Progress in Organic Coating[J].36(1999),148-172.