新型低温固化粉末涂料用聚酯树脂的合成与应用
发布时间：2018-07-15 22:28
【摘要】：低温快速固化粉末涂料近年来成为各企业或研究单位主要的研发课题,粉末涂料实现低温快速固化意义重大,不但节能降耗,降低成本,而且会拓宽应用领域,使得这种新型的涂料取代传统涂料的速度加快。本文从粉末涂料所用的聚酯树脂入手,通过引入新型单体对制备聚酯树脂的配方和工艺进行改进,提升聚酯树脂的主链柔韧性和端基活性,在合成后期添加特殊效果的促进剂,有效降低了粉末涂料的固化反应温度,缩短了固化反应时间,使传统的以异氰脲酸三缩水甘油酯作为固化剂的粉末涂料,在200℃温度下放置10分钟的固化条件降低到130℃放置20分钟。并考察了聚酯树脂的各项性能及其在粉末涂料中的表现,如涂层外观,冲击性能,耐人工老化性等性能。经过各种实验对比,以TGIC为固化剂的粉末涂料用聚酯树脂在酸价40-45mgKOH/g时会表现出较好的低温快速固化倾向,主要原材料有对苯二甲酸,己二酸,2-丁基-2-乙基-1,3-丙二醇,1,4-环己烷二甲酸,1,6-己二醇,间苯二甲酸,三羟甲基丙烷,反丁烯二酸,新戊二醇,并辅以丁基锡酸,复合抗氧剂,固化促进剂,得到了酸值42.4mgKOH/g,熔融粘度3160mPa.s,软化点111℃,外观为无色透明的颗粒。按照聚酯树脂与TGIC的92:8的固化比例,配以颜料、填料、助剂等通过混合,熔融挤出,研磨,过筛,喷涂和烘烤,在130℃烘烤20分钟时得到较满意的粉末涂层。对上述配方合成的聚酯树脂,通过GPC凝胶色谱,DSC差式扫描量热仪,近红外及中红外对聚酯树脂进行表征,测试分析后,得出数均分子量是5519,重均分子量是8425,分子量分布宽度是1.53,分子量分布宽度适中。通过DSC测得玻璃化温度是58.8℃,具有较好的储存稳定性。对制备的粉末涂层通过人工加速老化试验,考察涂层的失光,粉化以及褪色情况,该粉末涂料制备的粉末涂层达到了粉末涂料的优级标准。
[Abstract]:In recent years, low temperature and fast curing powder coatings have become the main research and development topics of various enterprises or research units. It is of great significance to realize low temperature rapid curing of powder coatings, which not only saves energy and reduces costs, but also widens the application fields. The speed of replacing the traditional coatings with this new coating is accelerated. Starting with the polyester resin used in powder coating, the formula and process of preparing polyester resin were improved by introducing new monomer to improve the flexibility and terminal group activity of the main chain of polyester resin, and the accelerator of special effect was added in the later stage of synthesis. The curing reaction temperature of powder coating was reduced effectively, the curing time was shortened, and the traditional powder coating with triglycidyl isocyanurate as curing agent was made. The curing conditions at 200 鈩，
本文编号：2125581
[Abstract]:In recent years, low temperature and fast curing powder coatings have become the main research and development topics of various enterprises or research units. It is of great significance to realize low temperature rapid curing of powder coatings, which not only saves energy and reduces costs, but also widens the application fields. The speed of replacing the traditional coatings with this new coating is accelerated. Starting with the polyester resin used in powder coating, the formula and process of preparing polyester resin were improved by introducing new monomer to improve the flexibility and terminal group activity of the main chain of polyester resin, and the accelerator of special effect was added in the later stage of synthesis. The curing reaction temperature of powder coating was reduced effectively, the curing time was shortened, and the traditional powder coating with triglycidyl isocyanurate as curing agent was made. The curing conditions at 200 鈩，
本文编号：2125581
本文链接：https://www.wllwen.com/shoufeilunwen/boshibiyelunwen/2125581.html
