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毕业论文网 > 毕业论文 > 材料类 > 金属材料工程 > 正文

耐低温紫外光固化涂料的研究毕业论文

 2022-06-06 22:36:59  

论文总字数:18171字

摘 要

传统涂料是用有机溶剂将原料成分混合起来,其固化过程是通过加热即物理干燥的方法除去涂料中的溶剂,溶剂挥发之后得到硬化的漆膜。然而传统涂料的溶剂多是甲苯、二甲苯、丙酮、甲乙酮等有机溶剂,挥发后的气体对人体有极大的危害。因此,低VOC的光固化涂料时涂料发展的必然选择。

在光固化涂料常用的四种不饱和丙烯酸树脂中,聚氨酯丙烯酸酯是已知耐低温性能最佳的树脂。聚氨酯丙烯酸酯具有粘接强度大、柔韧性好等优异特点,同时也有着耐水性差、耐温性能不佳等不足;聚氨酯丙烯酸酯分子结构中既含有丙烯酸官能团,又含氨基甲酸酯键,可以将二者的优点结合起来,弥补两者的不足之处,发挥协同作用的优势,因此,聚氨酯丙烯酸酯树脂具有良好的附着力、柔韧性、耐磨性,较快的光固化速度和耐温性及突出的高弹性和伸长率,已广泛应用于塑料涂层、油墨印刷、金属、木材、织物印花、纤涂层等方面,是一种发展前景广阔的光固化树脂。

单一成分的光固化涂料在耐候性方面受到较大限制,在研究中通常加入各种含有特定基团的有机物或与其他低聚物混合,以求达到增强耐候性、改善性能的目的。本实验采用江阴摩尔化工有限公司生产的聚氨酯丙烯酸酯MI100和自制的高分子量聚氨酯丙烯酸酯PU10000两种聚氨酯丙烯酸酯以1:1的质量比混合作为基础液,加入不同丙烯酸酯类树脂来改善涂料的综合力学性能,并最终与国精化学股份有限公司生产的有机硅树脂GU2800以不同比例混合,找出性能最佳配比,并测试其玻璃化转变温度是否能达到使用要求。

关键词:聚氨酯丙烯酸酯 有机硅树脂 耐低温性 紫外光固化

Low temperature tolerance UV curable coatings

Abstract

Traditional coating is to use organic solvent to mix raw materials composition, its solidification process is heated by physical method to remove, solvents in coatings and get the paint film after solvent evaporation. However the traditional coating solvents are toluene, xylene, acetone, methyl ethyl ketone, such as organic solvent, volatile gas after a great harm to human body. Therefore, low VOC of uv-curable paint coating development inevitably choice.In light of four kinds of commonly used coating curing unsaturated acrylic resin, polyurethane acrylate resin is the best known good low temperature resistance performance. Polyurethane acrylate has excellent bonding strength, good flexibility and so on characteristics, at the same time also has a poor water resistance and heat resistance defects such as poor performance; Both in the molecular structure of polyurethane acrylates containing acrylic acid functional groups, and contains carbamate bond, can combine the advantages of both, make up the disadvantages of the two, play the advantages of synergy, therefore, polyurethane acrylate resin has good adhesion, flexibility, abrasion resistance, fast curing light speed and temperature resistance and high elasticity and elongation, and has been widely used in plastic coating, printing ink, printing, metal, wood, fabric printing, fiber coating, etc., is a development prospect of light cure resin.Single composition of uv curing coatings in the field of weather resistance is limited by large, often join in the study all contains a certain group of organisms or mixed with other oligomer, in order to achieve the enhancement purpose to the weatherability, improved performance.

This experiment adopts the jiangyin Moore chemical co., LTD. Production of polyurethane acrylates MI100 and homemade high molecular weight polyurethane acrylate PU10000 two kinds of polyurethane acrylate with 1:1 quality than the mixed liquid as the foundation, to join different acrylic ester resin to improve comprehensive mechanical properties of paint, and ultimately to the fine chemical co., LTD., the production of organic silicon resin GU2800 mixed in different proportion, find out thbest ratio of performance, and test their glass transition temperature can meet the use requirements.

Key Words:Polyurethane acrylate;Silicone resin;Low temperature resistance;UV curing


目录

摘要 I

Abstract II

第一章 绪论 1

1.1 引言 1

1.2 紫外光固化涂料成分 2

1.3 常用不饱和丙烯酸树脂 3

1.3.1 聚氨酯丙烯酸酯(PUA) 3

1.3.2 环氧丙烯酸酯(EA) 4

1.3.3 聚酯丙烯酸酯 5

第二章 实验原理及过程 6

2.1 实验原理 6

2.2 实验仪器 6

2.3 实验原料 7

2.4 实验方法与性能测试 7

第三章 结果与讨论 9

3.1 配方设计与讨论 9

3.2 DSC及TG分析 13

3.3 不足与改进 14

第四章 结论与展望 16

4.1 结论 16

4.2 展望 16

参考文献 17

致谢 19

第一章 绪论

1.1 引言

涂料属于有机化工高分子材料,所形成的涂膜属于高分子化合物类型。由于传统的低固体分涂料中通常存在着大量有害溶剂挥发物,因此,世界工业涂料的发展的总趋势是减少VOC(挥发性有机物)等,所以传统的溶剂型涂料比重逐渐下降,而无污染、环保型的粉末涂料、水性涂料、高固体分涂料等等将成为涂料的主角。辐射固化涂料中的光固化涂料具有减轻空气污染、固化速度快、节省能源、占地少、适于自动化流水线涂布等特点,应用范围较广,发展较快。光固化涂料是二十世纪六十年代开发的一种环保节能型涂料,七十年代我国开始涉足该技术,九十年代后得到了长足的发展。目前,光固化涂料不仅在木材、金属、塑料、纸张、皮革上大量使用,而且在光纤、印刷线路板、电子元器件封装等材料上也成功应用。

紫外光(UV)固化技术是一项高效环保的新技术,它是指在高能量的紫外光作为固化能源的照射下,由体系中的光引发剂吸收紫外光产生自由基,引发光敏树脂(预聚物)和活性稀剂分子发生连锁聚合反应,使得液相体系在瞬间进行聚合、交联和固化的过程。[1]

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