【作者】 王志强；

【导师】 马建泰； 孟军锋；

【作者基本信息】 兰州大学 ， 化学工程， 2014， 硕士

【摘要】 本文针对聚碳酸酯透明件表面防护的需求,研制透明件表面耐磨防护涂层。芳香族聚碳酸酯材料具有优异的光学性能和物理机械性能,因此,该材料在航空、航天、车辆等领域得到了广泛的应用。但是,该材料自身还有许多不足之处；如耐磨性、耐水解性能、耐紫外线性能、耐碱性以及耐各种溶剂性差,这些不足之处制约着聚碳酸酯材料的广泛应用。鉴于上述原因,各国学者针对聚碳酸酯透明件表面的防护提出了各种解决方法。主要手段之一是在透明件表面涂装耐磨涂层。在要求耐磨涂层具有耐磨性的同时,还具有良好的紫外线吸收功能；而且涂层还要具有阻止聚碳酸酯材料水解的功能。在聚碳酸酯透明件保护涂层发展的初期,涂层主要是解决了耐磨性能,并兼顾了透明性。但随着聚碳酸酯透明件应用领域的不断扩大,对防护涂层的要求也逐渐发展到了还须具有紫外线吸收功能,以及阻止聚碳酸酯水解的功能。随着透明件耐磨防护涂层的不断研究和发展,聚碳酸酯透明件耐磨涂层已逐步形成了以含硅为主的聚硅氧烷类耐磨涂层、丙烯酸紫外光固化耐磨涂层、聚氨酯耐磨涂层以及无机涂层等；其中聚氨酯涂层是通过涂层多具有的弹性来保证涂层具有良好的耐磨性,其余几种涂层是通过提高涂层的硬度来保证涂层的耐磨性。本文研制的是一种以含硅为主的聚硅氧烷类耐磨涂层。该涂层采用烷氧基硅烷单体改性硅溶胶,并在体系中引入具有增硬功能的纳米二氧化硅粒子；从而保证涂层具有良好的耐磨性。另外在烷氧基硅烷改性过程中引入一定量的含氟硅氧烷单体,同时严格控制涂料的聚合程度,确保使固化后的涂层具有一定的疏水性,提高了涂层的防水渗透功能,从而提高了聚碳酸酯透明件的耐水解性能。合成烷氧基封端的含聚碳酸酯链段的聚合物作为附着力促进剂,使耐磨涂层具有良好的附着力；在涂料体系中引入纳米氧化钛粒子增强涂层的紫外线吸收功能,保证涂层具有较好的紫外线吸收功能。在涂料制备过程中采用适宜的溶剂体系,使涂料具有良好性能的同时,还具有良好的施工性能。本文制备的涂料经过合理规范的施工,固化后即可得到性能优异的聚碳酸酯透明件耐磨防护涂层。该透明件耐磨防护涂层具有良好的耐磨性、附着力、透明性、紫外线吸收功能、防水渗透性等,实现了对聚碳酸酯透明件的耐磨防护。更多还原

【Abstract】 This paper is focus on the wear-resisting coating for transparent polycarbonate material. As aromatic polycarbonate material has excellent optical performance and mechanical properties, it is widely used in the fields of aviation, aerospace, vehicles and so on. However, the poor performance of polycarbonate material, such as wear resistance, hydrolysis resistance, UV-resistant, alkali resistance, and poor resistance to varies solvents, restricts the application of polycarbonate material.Various solutions are provided to the protective coating surface of transparent polycarbonate by researchers all over the world. One of the principal methods is to paint wear-resisting coating in the material surface. The wear-resisting coating needs to have good UV absorption, and also prevents the hydrolysis of polycarbonate. In the early stage of polycarbonate coating development, the main target is the wear-resisting performance, and transparency is taken into account. Along with the expansion of transparent polycarbonate application fields, the features of U V absorption and polycarbonate hydrolysis preventing are gradually developed. Several wear-resistant coating for transparent polycarbonate are formed:the silicon-based polysiloxane wear-resisting coating, acrylic UV curing coating, polyurethane wear-resisting coating and inorganic coating, wherein the polyurethane coating is relying on the elasticity of the coating to ensure good coating wear resistance, while wear resistance of the other coatings are ensured by improving the hardness of the coating.In this paper, the development of a silicon based polysiloxane coating is reported. With alkoxy silane monomer modified silica sol, the nano-silica particles with hardening function was introduced to the system to ensure the coating has good wear resistance; by introducing certain amount fluorine-containing siloxane monomer in the alkoxysilane modification process while controlling the polymerization degree of the coating, it possesses certain amount of water hydrophobicity after curing, which prevents water contacting with the polycarbonate material, and improved hydrolysis resistance of the polycarbonate parts; by synthesizing alkoxy capped polymer polycarbonate chain-containing polymer as an adhesion promoter, the wear-resistant coating has good adhesion; the introduction of nano titania particles in coating enhanced coating UV absorption ability, ensure the coating has better UV absorption feature; proper solvents are adopted during the production process so that that coating has a great workability performance with all these good features.The wear-resisting coating for transparent polycarbonate material, obtained via proper construction and curing from well produced coating, shows great wear resistance, adhesion, transparency, UV absorption properties and effectively prevents the hydrolysis of polycarbonate.更多还原