PVDF氟树脂涂料的组成与性能研究.pdf

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1、目录摘要·。··············。···········································一1Abs七rac七········，··················，·····，··。·。··。二。··········。…2第一章前言···。·····，······，······················，···········，。…4第一节氟树脂涂料········，····························...……4第二节PVDF树脂涂料的应用·················

2、。····。··，····……巧第三节总结··················，·····························。。二23第二章实验部分···········································。.……024第一节实验材料·············································。二24第二节测量方法及设备····································……6第三节样品制备······························

3、············……7第四节涂层的制备········································……27第五节性能测试··········································……27第三章讨论与结论··········································.·……28第一节结果与讨论········。·······························……28第二节结论·······。································

4、······……44参考文献···········。········································……45致谢························································……48摘要本文研究了聚偏二氟乙烯(PVDF)氟树脂涂料的组成、制备和使用过程对涂料性能的影响，为PVDF涂料配比和制备工艺的设计提供依据。PVDF涂料在使用过程中，经常发生涂料触变性大、涂层外观缺陷多、光泽波动、耐候性不稳定等问题，影响了涂料的使用与性能。通过研究溶剂、丙烯酸树脂与PVD

5、F树脂的混溶性、制备过程的温度变化及冷却方式的不同、各种颜料的耐候性比较，确定相关因素的影响机理。通过比较各种溶剂PVDF树脂分散体的粘度和触变性，发现酮类和酷类溶剂可获得较低的分散粘度。异佛尔酮作为PVDF树脂的分散介质可获得较低的施工粘度和触变性，更利于聚偏二氟乙烯口vDF)氟树脂涂料的滚涂应用。研究了丙烯酸树脂的种类对PVDF树脂涂料的影响，并根据氢键竞争理论对丙烯酸树脂与PVDF树脂混合体粘度的波动进行了分析讨论。实验表明丙烯酸树脂组成结构对PVDF树脂的相容性产生影响。丙烯酸树脂结构中氢键给体的含量越多，丙烯酸树脂与PVDF树脂分

6、散体的混溶性越差，聚甲基丙烯酸甲酷树脂的混溶性最好。同时外加强氢键给体，会破坏PVDF树脂与丙烯酸树脂形成的氢键，使体系的粘度和触变性急剧增加。通过人工加速老化实验，研究了不同颜料在PVDF树脂涂料中的耐候性。颜料的体积浓度、遮盖力、耐光性等因素可导致PVDF树脂涂料耐候性的降低。研究了高温烘烤后，冷却方式的不同对涂层性能的影响。水冷与风冷过程冷却速度的差异，导致PVDF树脂产生不同的晶体形态。水冷过程主要形成p晶相，光泽较高;风冷或自然冷却过程主要形成。晶相，光泽较低。晶相的不同也造成涂层保光性上的差异。比较多种温度下分散体的粘度变化，发

7、现温度大于70’C时，涂料流变学行为产生突变，粘度急剧升高，影响PVDF涂料的涂装性能。通过组成涂料的溶剂、树脂、颜料及制备温度、冷却方式的研究，总结出各种因素的影响规律，从而可以利用涂料配方和工艺设计的调整提高PVDF涂料的涂装和使用性能。关键词:PVDF涂料氟树脂中图分类号:TQ63AbstraCt玩thisPaPerthee价etofcomPonentPaltandPreParationandaPPlieationProeessonPol尹山ylidonedifluoride(PVDF)eoatingswass加died，theres

8、ultsProvidedthebasisforPVDFeoatingsratioandPreParationteehnologydesign.SomeP:oblemsonenaf