基于含氟丙烯酸树脂的模压激光全息记录材料

摘要

模压激光全息防伪技术因其效率高、不可重复使用、易于商品包装等，成为当今市场上打击假冒伪劣的主流手段。此技术是依靠记录层树脂上的全息图发挥承载与传递防伪信息的作用，目前此层普遍使用热塑性丙烯酸树脂。这种材料在全息图转移的模压过程中，与镍制母版间的相互作用力较大，脱模时难以分离，常出现树脂粘连及损坏现象。为解决这一问题，通过向丙烯酸树脂中添加聚四氟乙烯（PTFE）微粉来降低表面能。但PTFE与丙烯酸树脂的相容性极差，两者难以均匀混合，影响了复合薄膜性能。基于此，本文采取电子束共辐照接枝与萘钠化学刻蚀手段改善PTFE微粉的表面润湿性。 论文的主要工作如下：首先采用电子束共辐照法制备接枝聚甲基丙烯酸甲酯PTFE微粉（PMMA-g-PTFE），探讨了甲基丙烯酸甲酯的浓度、辐照剂量与接枝率的关系，研究了接枝对PTFE微粉与丙烯酸树脂相容性的影响。结果显示氟碳表面活性剂能显著减少共辐照接枝过程中单体均聚、交联物的生成；17.8%接枝率的PMMA-g-PTFE微粉在丙烯酸树脂中分散均匀，二者相容性得到明显改善。因表面氟含量和粗糙度增加，添加14wt%微粉的丙烯酸树脂/PMMA-g-PTFE复合薄膜水接触角提高了21.1%。 另一方面，研究了萘钠化学刻蚀PTFE微粉（Na-Naph-PTFE）对丙烯酸树脂薄膜表面性能的改善效果，探讨了萘钠处理液浓度和刻蚀时间对PTFE微粉表面化学组成和团聚程度的影响。结果表明，虽然高浓度萘钠处理液与长刻蚀时间能实现微粉表面“脱氟加氧”目标，但过度刻蚀反而导致碳化与团聚，不利于改进PTFE与丙烯酸树脂间的相容性。进而发现，0.4mol/L萘钠处理液刻蚀5min的Na-Naph-PTFE微粉能同时满足低氟高氧量、少碳化、轻团聚的要求，其与丙烯酸树脂复合制备的薄膜表面疏水性随微粉添加量的增加而增强。 比较上述两种改性方法可知，电子束辐照接枝法可控性强，对丙烯酸树脂表面性能改善效果明显；萘钠化学刻蚀法中的含氧碳链引入效率高，没有副产物的影响。制备的丙烯酸树脂/改性PTFE复合薄膜表面疏水性增强，用作模压激光全息防伪记录材料时，能有效地减小和镍制母版间的相互作用力，改善模压性能，在防伪领域中具有良好的应用前景。

目录

第一个书签之前

摘 要

Abstarct

1 绪论

1.1 前言

1.2 激光全息防伪技术

1.2.2 激光全息技术分类与发展

1.2.3 模压激光全息防伪材料

1.2.4 模压激光全息记录材料

1.3 模压激光全息记录材料用丙烯酸树脂改性

1.3.1 丙烯酸树脂的改性方法

1.3.2 高能射线辐照改性含氟材料

1.3.3 化学刻蚀改性含氟材料

1.4 论文的研究意义及主要内容

2 实验部分

2.1 原料与试剂

2.2 仪器与表征

2.3 实验方法

2.3.2 丙烯酸树脂/萘钠刻蚀PTFE复合薄膜的制备

3 结果与讨论

3.1 丙烯酸树脂/辐照接枝PTFE复合薄膜的结构与性能

3.1.1 PMMA-g-PTFE微粉的结构分析

3.1.2 单体质量分数与辐照剂量对PMMA-g-PTFE微粉的影响

3.1.3 丙烯酸树脂/PMMA-g-PTFE微粉的分散特性

3.1.4 丙烯酸树脂/PMMA-g-PTFE复合薄膜的表面性质

3.2 丙烯酸树脂/萘钠刻蚀PTFE复合薄膜的结构与性能

3.2.1 Na-Naph-PTFE微粉的结构分析

3.2.2 处理液浓度与刻蚀时间对Na-Naph-PTFE微粉的影响

3.2.3 丙烯酸树脂/Na-Naph-PTFE微粉的分散特性

3.2.4 丙烯酸树脂/Na-Naph-PTFE复合薄膜的表面性质

4 全文结论与研究展望

4.1 全文结论

4.2 研究展望

致谢

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附录 攻读硕士学位期间发表的学术论文与专利