论文总字数：18550字

摘 要

加成型液体硅橡胶具有诸如硫化过程不产生副产物、收缩率小、可以深层硫化等优点，在高温环境下的密封性也比缩合型液体硅橡胶的好。传统液体硅橡胶一般采用高温固化的方式，虽然固化深度高，但是固化过程中能源消耗高，并且会向空气中排放有毒气体和二氧化碳，不能够满足节能环保的要求。因此将紫外光固化应用到液体硅橡胶的固化中，可以有效地结合两者的优点，不仅使液体硅橡胶的应用扩展到了新的领域，而且能为光固化材料增添了新的优良种类，有望成为未来涂料固化方法的发展方向。因此设计了不同配方的固化膜，研究了加入不同质量的铂催化剂后的固化膜的电气性能和凝胶率，以及乙烯基与巯基不同含量比下，固化膜的电气性能。结果表明：在控制硅树脂、巯基硅油和光引发剂比例不变的情况下，当加入铂催化剂的量占总量约2.4%时，固化膜具有最高的击穿强度33.45，固化膜也具有最高的凝胶率；在控制光引发剂和铂催化剂含量的前提下，当乙烯基含量与巯基含量的比例为1:0.9时，固化膜具有最高的击穿强度20.55；当补强填料SiO2含量达到11%时，固化膜的拉伸强度达到最高为1.8405MPa，断裂伸长率达到最高为185.8104%，撕裂强度达到最高为5.6044MPa。

关键词：加成型液体硅橡胶；紫外光-热双重固化；击穿强度；凝胶率；拉伸强度；断裂伸长率；撕裂强度

Abstract

Liquid silicone rubber has many advantages, such as curing process without producing byproducts, small shrinkage, deep vulcanization, its tightness in a high temperature environment is better than the condensation-type liquid silicone rubber. Traditional liquid silicone rubber commonly used the way of high temperature solidification. Although the depth of solidification was high, the curing process consumed high energy, and it would emit toxic gases and carbon dioxide into the air, which could not meet the requirement of energy saving and environmental protection. Therefore, we applied UV-curable to curing of liquid silicone, and the way could combine the advantages of both effectively. Not only could the application of liquid silicone rubber be extended to new areas, but it could also add new kinds of good light-curable materials. It was expected to be the future direction of the paint curing process. Therefore, we had designed different formulations of the cured film. And we had study the electrical properties and the gel fraction of the cured films, which had been added different mass of platinum catalyst, and the electrical properties of the cured films with different content ratios of vinyl group and mercapto group. The experimental results indicated that under the control of the ratio of silicone resin, mercapto silicone oil and photo initiator unchanged, when an amount of platinum catalyst accounted for about 2.4% of the total amount ,the cured film had the highest dielectric strength, which was 33.45, and the cured film also had the highest gel rate. Furthermore, we controlled the content of photo initiator and platinum catalyst unchanged, when the ratio of the vinyl group content with mercapto group content was 1: 0.9, the cured film had the highest dielectric strength, which was 20.55. When the content of the reinforcing filler SiO2 was 11%, the tensile strength, elongation at break, tear strength of the cured film was the highest, 1.8405MPa, 185.8104% and 5.6044MPa, respectively.

Key words: Addition of liquid silicone rubber; UV-thermal double curing; Dielectric strength; Gel rate; Tensile strength; Elongation at break; Tear strength

目 录

摘 要 I

Abstract II

第一章 绪论 1

1.1 前言 1

1.2 硅橡胶分类 1

1.2.1 缩合型单组分室温硫化硅橡胶 2

1.2.2 缩合型双组分RTV硅橡胶 2

1.2.3 加成型液体硅橡胶 3

1.3 加成型液体硅橡胶 3

1.3.1 基础胶 4

1.3.2 交联剂 4

1.3.3 催化剂 5

1.3.4 抑制剂 5

1.3.5 填料 6

1.4 光固化 6

1.4.1 光固化有机硅体系的分类 6

1.4.2 硫醇-烯烃官能化聚硅氧烷 7

1.4.3 丙烯酸酯化聚硅氧烷 7

1.4.4 环氧官能化聚硅氧烷 8

1.4.5 乙烯基醚类聚硅氧烷 8

1.4.6 苯乙烯基聚硅氧烷 8

第二章 实验目的、材料及方法 10

2.1 实验目的 10

2.1 实验材料 10

2.2 实验主要仪器设备 10

2.3 实验方法 10

2.3.1 硅树脂与巯基硅油最佳配比的选择 10

2.3.2 不同配方固化膜的制备 11

2.3.3 固化膜击穿电压测量 11

2.3.4 固化膜凝胶率测量 11

2.3.5 固化膜力学性能测量 12

第三章 实验内容与数据处理 13

3.1 硅树脂与巯基硅油最佳配比实验 13

3.2 固化膜击穿电压测量 14

3.3 固化膜凝胶率测量 17

3.4 乙烯基与巯基不同含量比下的固化膜性能测试 18

3.5 固化膜力学性能测量 20

第四章 结论与展望 23

4.1 结论 23

4.2问题及展望 23

参考文献 25

致谢 26

第一章 绪论

1.1 前言

加成型液体硅橡胶在诸多硅橡胶品种中档次较高，加成型硅橡胶的制备具有硫化过程不产生副产物、体积收缩率小、可以深层硫化的优点。加成型硅橡胶的密封性也较好，特别是在高温环境下的密封性表现得也很优异。另外，LSR还具有工艺简便、成本低廉的优点，这是由于液体硅橡胶分子量小、粘度低、加工成型方便，可省去混炼、预成型、后整理等复杂工序，容易实现自动化生产，并且能够节省能源和劳动力，生产周期短并且效率高。所以，虽然说LSR的原料价格要比普通硅橡胶高许多，但是总的成本却要比普通硅橡胶的成本低，特别是在制造小件产品时更能展现出LSR廉价这方面的优越性。

光固化技术具有快速固化、低能耗、高效率、无污染等优点，是一种环境友好的绿色技术。常见的紫外光固化体系以自由基固化机理为主，它的特点是固化速率快、树脂和活性稀释剂种类多等，但也存在固化深度不够、表面存在氧阻聚、固化过程提及收缩率大、膜层附着力不高等缺点。为克服这些缺点，将紫外光固化与其它固化方式结合起来形成混杂固化体系，是目前紫外光研究领域的热点。

请支付后下载全文，论文总字数：18550字