CN112898891A - 一种水性led光固化强耐腐蚀金属涂料及其制备方法 - Google Patents
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Abstract
本发明涉及一种水性LED光固化强耐腐蚀金属涂料及其制备,由改性多功能树脂、光引发剂、助溶剂、色浆和去离子水等组成,树脂采用环氧丙烯酸酯类为基本共聚单体,同时引入多官能团的单体,通过特定的工艺合成水溶性羟基丙烯酸树脂。以质量百分数计,其原料配方为:改性多功能树脂70‑90份、光引发剂4‑6份、助溶剂3‑5份、色浆5‑7份、填料4‑6份和去离子水。此发明得到粒径较小的树脂,从而提高了成膜的致密程度,提升了附着力,同时也增强了涂料的硬度、耐腐蚀和耐盐雾性,可有效的保护金属,很大程度上提高了涂料产品的整体性能。
Description
技术领域
本发明涉及一种水性LED光固化强耐腐蚀金属涂料及其制备方法,属于水性涂料领域。
背景技术
由于具备低VOC、干燥速度快等优点,UV光固化技术在蓬勃发展,但是传统的UV光固化技术普遍采用波长范围较宽的高压汞灯作为发光光源,导致此技术有一些难以克服的缺陷:高压汞灯的线谱很宽,其真正起到有效固化的紫外光谱波段只占其中的那一小部分,能源利用率不高,红外波段产生的热量会使承印物发生形变,限制了应用范围。LED光固化技术相比汞灯不仅效率高、还更可靠、体积小,寿命长。LED出光表面没有热辐射,芯片热量通过背部的散热结构排除,避免高压汞灯的高温表面带来的各种隐患。本发明的涂料采用LED光固化技术,快速高效成型;水性涂料由于采用水做为稀释剂,大幅度降低了挥发性有机化合物(VOC)排放,所得的涂层无异味残留、硬度高、附着能力强,应用十分广泛。
发明内容
本发明的目的在于提供一种水性LED光固化强耐腐蚀金属涂料及其制备方法。本发明制备的水性涂料采用LED光固化技术,快速高效成型;涂层具有优异的稳定性、防腐性能、低粘度以及低VOC含量的特征,不仅减小了施工难度,降低了对施工人员和环境的毒害,而且达到了溶剂型饱和聚酯涂料才能达到的饱满、高光泽的效果。分子中的长链基团可有效的增强柔韧性,使涂料与金属建材等结合更紧密。改性多功能树脂,一物多用,本身有很好的水溶性,成型后其可增强涂层的硬度、疏水性,待其成型后,不易溶于水等溶剂。合成的树脂可与金属等更紧密的结合,硬度高,耐水性、耐候性能更佳,有效的保护了金属。
一种改性多功能树脂水性金属涂料,配方由改性多功能树脂70-90份、光引发剂4-6份、助溶剂3-5份、色浆5-7份、填料4-6份和去离子水组成。
其中所述的改性多功能树脂水性金属涂料,由以下步骤制备:
a)、改性多功能树脂的制备:先将改性后的环氧丙烯酸酯、异佛尔酮二异氰酸酯和含有羧基或羟基的混合在80℃下搅拌1h,使之充分反应,合成二丙烯酸酯-单体的聚合物;
将上述聚合物、扩链剂、引发剂加入到装有温度计、磁力搅拌、回流装置的反应容器中,开启搅拌并升温到90℃,保温3h,降温至50℃左右,并加入中和剂中,得到水溶性改性多功能树脂。
b)、水性LED光固化强耐腐蚀金属涂料的制备:在容器中加入改性多功能树脂、助溶剂、色浆、填料搅拌均匀后加入光引发剂,最后加入去离子水搅拌成粘稠的均一流体,然后置于50℃水浴加热10min,即可得到所述的改性多功能树脂水性金属涂料。
所用的环氧丙烯酸酯类为环氧丙烯酸、环氧甲基丙烯酸及(甲基)丙烯酸丁酯、环氧甲基丙烯酸甲酯、环氧(甲基)丙烯酸乙酯、环氧甲基丙烯酸异冰酯中的一种或几种的组合。
所用的扩链剂为丙酸 、丁酸、戊酸、三羟基甲基丙烷、聚丙二醇、聚乙二醇、聚四氢呋喃二醇、聚己二酸1,6-己二醇酯中的一种或几种的组合。
所用的填料为钛白粉、云母粉、滑石粉、硫酸钡中的一种或几种的组合。
所用的引发剂为水溶性的亚硫酸钠、硫代硫酸钠、多元醇及多元胺过氧类过氧化二特丁基、过氧化二异丙苯和光引发自由基类2-甲基-1-(4-甲硫基苯基)-2-咖啡基-1-丙酮、2,4,6-三甲基苯甲酰基-而苯基氧化膦、1-羟基环己基苯基甲酮的一种或几种的组合。
所用的中和剂选自三乙胺、2-氨基-2-甲基-1-丙醇、三乙醇胺、N,N-二甲基乙醇胺、氨水、氢氧化钠中的一种或几种。
所用的多功能单体为甲基丙烯酸羟乙酯、甲基丙烯酸羟丙酯、丙烯酸甲酯、丙烯酸乙酯、丙烯酸丙酯、醋酸乙烯酯中的一种或几种的组合。
具体实施方式
实施例1
a)、改性多功能树脂的制备:先将改性后的环氧丙烯酸甲酯(60份)、异佛尔酮二异氰酸酯(30份)和甲基丙烯酸羟乙酯(30份)和甲基丙烯酸羟丙酯(30份)在80℃下搅拌1h,使之充分反应,合成二丙烯酸酯-单体的聚合物;
将上述聚合物、扩链剂丙酸(30份)、硫代硫酸钠(3份)加入到装有温度计、磁力搅拌、回流装置的反应容器中,开启搅拌并升温到90℃,保温3h,降温至50℃左右,并加入中和剂三乙醇胺中,得到水溶性改性多功能树脂。
b)、金属涂料的制备:在容器中加入改性多功能树脂(90份)、助溶剂(4份)、色浆(4份)、填料(4份)搅拌均匀后加入、过氧化二特丁基(3份),最后加入去离子水搅拌成粘稠的均一流体,然后置于50℃水浴加热10min,可得到所述的改性多功能树脂水性金属涂料coating-1. 得到25g/m2的涂层, 硬度2H, 耐盐雾600h不起泡,高低温循环可达7天。
实施例2
a)、改性多功能树脂的制备:先将改性后的环氧丙烯酸乙酯(55份)、异佛尔酮二异氰酸酯(30份)和甲基丙烯酸羟乙酯(30份)和甲基丙烯酸羟丙酯(30份)在80℃下搅拌1h,使之充分反应,合成二丙烯酸酯-单体的聚合物;
将上述聚合物、扩链剂丙酸(30份)、硫代硫酸钠(3份)加入到装有温度计、磁力搅拌、回流装置的反应容器中,开启搅拌并升温到90℃,保温3h,降温至50℃左右,并加入中和剂三乙醇胺中,得到水溶性改性多功能树脂。
b)、金属涂料的制备:在容器中加入改性多功能树脂(90份)、助溶剂(4份)、色浆(4份)、填料(4份)搅拌均匀后加入、过氧化二特丁基(3份),最后加入去离子水搅拌成粘稠的均一流体,然后置于50℃水浴加热10min,可得到所述的改性多功能树脂水性金属涂料coating-2. 得到的25g/m2的涂层,硬度2H, 耐盐雾700h不起泡,高低温循环可达7天。
实施例3
a)、改性多功能树脂的制备:先将改性后的环氧丙烯酸乙酯(60份)、异佛尔酮二异氰酸酯(30份)和甲基丙烯酸羟乙酯(30份)和甲基丙烯酸羟丙酯(30份)在80℃下搅拌1h,使之充分反应,合成二丙烯酸酯-单体的聚合物;
将上述聚合物、扩链剂丁酸(30份)、硫代硫酸钠(3份)加入到装有温度计、磁力搅拌、回流装置的反应容器中,开启搅拌并升温到90℃,保温3h,降温至50℃左右,并加入中和剂三乙醇胺中,得到水溶性改性多功能树脂。
b)、金属涂料的制备:在容器中加入改性多功能树脂(90份)、助溶剂(4份)、色浆(4份)、填料(4份)搅拌均匀后加入、过氧化二特丁基(3份),最后加入去离子水搅拌成粘稠的均一流体,然后置于50℃水浴加热10min,可得到所述的改性多功能树脂水性金属涂料coating-3。得到的25g/m2的涂层,硬度2H,耐盐雾800h不起泡,高低温循环可达7天。
下表为实施案例1-3制备的水性金属涂料的测试结果。
由上表可见,本发明涂料具有附着力强、硬度高、耐腐蚀和耐盐雾性等特征,可有效的保护金属,很大程度上提高了涂料产品的整体性能。
Claims (9)
1.一种水性LED光固化强耐腐蚀金属涂料,其特征在于:配方中的改性多功能树脂70-90份、光引发剂4-6份、助溶剂3-5份、色浆5-7份、填料4-6份和去离子水组成;其中所述的改性多功能树脂水性金属涂料,由以下步骤制备:
a)、改性多功能树脂的制备:
先将改性后的环氧丙烯酸酯、异佛尔酮二异氰酸酯和含有羧基或羟基的混合物在80℃下搅拌1h,使之充分反应,合成二丙烯酸酯-单体的聚合物;
将上述聚合物、扩链剂、引发剂加入到装有温度计、磁力搅拌、回流装置的反应容器中,开启搅拌并升温到90℃,保温3h,降温至50℃左右,并加入中和剂中,得到水溶性改性多功能树脂;
b)、金属涂料的制备:在容器中加入改性多功能树脂、助溶剂、色浆、填料搅拌均匀后加入光引发剂,最后加入去离子水搅拌成粘稠的均一流体,然后置于50℃水浴加热10min, 即可得到所述的改性多功能树脂水性金属涂料。
2.根据权利要求1所述的水性LED光固化强耐腐蚀金属涂料,其特征在于环氧丙烯酸酯类为环氧丙烯酸、环氧甲基丙烯酸及(甲基)丙烯酸丁酯、环氧甲基丙烯酸甲酯、环氧(甲基)丙烯酸乙酯、环氧甲基丙烯酸异冰酯中的一种或几种的组合。
3.根据权利要求1所述的水性LED光固化强耐腐蚀金属涂料,其特征在于所述的扩链剂为丙酸 、丁酸、戊酸、三羟基甲基丙烷、聚丙二醇、聚乙二醇、聚四氢呋喃二醇、聚己二酸1,6-己二醇酯中的一种或几种的组合。
4.根据权利要求1所述的水性LED光固化强耐腐蚀金属涂料,其特征在于所述的填料为钛白粉、云母粉、滑石粉、硫酸钡中的一种或几种的组合。
5.根据权利要求1所述的水性LED光固化强耐腐蚀金属涂料,其特征在于所述的引发剂为水溶性的亚硫酸钠、硫代硫酸钠、多元醇及多元胺过氧类过氧化二特丁基、过氧化二异丙苯和光引发自由基类2-甲基-1-(4-甲硫基苯基)-2-咖啡基-1-丙酮、2,4,6-三甲基苯甲酰基-而苯基氧化膦、1-羟基环己基苯基甲酮的一种或几种的组合。
6.根据权利要求1所述的水性LED光固化强耐腐蚀金属涂料,其特征在于所述中和剂选自三乙胺、2-氨基-2-甲基-1-丙醇、三乙醇胺、N,N-二甲基乙醇胺、氨水、氢氧化钠中的一种或几种。
7.根据权利要求1所述的水性LED光固化强耐腐蚀金属涂料,其特征在于所述多功能单体为甲基丙烯酸羟乙酯、甲基丙烯酸羟丙酯、丙烯酸甲酯、丙烯酸乙酯、丙烯酸丙酯、醋酸乙烯酯中的一种或几种的组合。
8.根据权利要求1所述的水性LED光固化强耐腐蚀金属涂料,其特征在于所改性树脂的分子量为20000-60000。
9.根据权利要求1所述的水性LED光固化强耐腐蚀金属涂料在制备光固化金属涂料中的应用。
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