彩涂板时效性能的研究

通过研究，找到了快速预测彩涂板涂层附着力老化性能的试验方法，并对试验进行了系统分析。结果表明，涂料树脂结构、基材粗糙度、基材类型和彩色涂料预处理工艺对彩色涂料的附着力老化性能有很大影响。提出了提高彩涂板涂层附着力老化性能的途径。涂层附着力是评价彩涂板质量的重要技术指标。目前，国内外普遍采用T型弯曲试验来表征彩涂板涂层的附着力。然而，彩涂板的使用经验表明，一些彩涂板会随着储存时间的延长而迅速劣化，影响彩涂板的正常使用。彩涂板涂层附着力老化性能最直接的表现是彩涂板的T型弯曲试验结果，随着储存时间的延长，其下降速度很快。导致t形弯曲性能持续下降的主要因素是彩色涂层板储存的自然环境中的水、氧和离子的影响。

这种效应是一个缓慢的过程，因此需要一些时间才能产生这种效应，并且可以通过T形弯曲试验来证明。这将导致彩涂板到达用户手中后附着力差，对 彩涂板生产单位和用户产生不利影响。本文通过加速模拟自然环境对涂层附着力的影响，得到了一种能够快速、准确预测彩涂板涂层附着力老化性能的测试方法。通过实验，得到了不同涂层体系的彩涂板涂层附着力老化性能的变化规律。研究分析了影响彩涂板涂料附着力老化性能的各种因素，提出了提高彩涂板涂料附着力老化性能的途径。离线彩色涂层钢板将按照《彩色涂层钢板和钢带试验方法》进行T形弯曲试验。然后，将样品在实验室环境中储存6个月并取出，同时进行T型弯曲试验，以获得样品涂层附着力的老化性能半年。1.2彩色涂层钢板的涂层附着力和老化性能预测
彩色涂层钢板和钢带的试验方法
进行T形弯曲试验。然后将试样放入恒温恒湿试验箱进行24小时加速老化试验，试验温度为70℃，试验相对湿度为95%。试验涂层表面的水分子可通过吸附、扩散和渗透到达涂层-金属基体界面，直至涂层/金属基体结合界面被破坏。这种界面失效的最初宏观表现可能是涂层附着力的降低，表现为涂层附着力的老化性能差，其进一步的宏观表现为涂层起泡和脱落。因此，通过对彩涂板附着力和老化性能的实验结果，可以预测彩涂板的耐腐蚀性，对提高彩涂板的产品质量具有良好的预警作用。

Through research, the test method for quickly predicting the adhesion aging performance of color coated plate coating is found, and the experiment is systematically analyzed. It shows that the coating resin structure, substrate roughness, substrate type and color coating pretreatment process have a great impact on the adhesion aging performance of color coated plate coating. The way to improve the adhesion aging performance of color coated plate coating is put forward. Coating adhesion is an important technical index to evaluate the quality of color coated plate. At present, T-bend test is generally used to characterize the adhesion of color coated plate coating at home and abroad. However, the use experience of color coated plates shows that some color coated plates will deteriorate rapidly with the extension of storage time, which affects the normal use of color coated plates. The most direct manifestation of the coating adhesion aging performance of color coated plates is the T-bend test results of color coated plates, which decrease rapidly with the extension of storage time. The main factor causing the continuous decline of t-bending performance is the influence of water, oxygen and ions in the natural environment where the color coated plate is stored.

This effect is a slow process, so it takes some time for this effect to occur and can be demonstrated by T-bend test. This will result in poor adhesion after the color coated plate reaches the user's hands, which will have an adverse impact on the color coated plate production units and users. In this paper, by accelerating the simulation of the influence of natural environment on coating adhesion, a test method which can quickly and accurately predict the aging performance of color coated plate coating adhesion is obtained. Through experiments, the variation laws of the adhesion aging properties of color coated plate coatings with different coating systems are obtained. Various factors affecting the adhesion aging properties of color coated plate coatings are studied and analyzed, and the ways to improve the adhesion aging properties of color coated plate coatings are put forward. The off-line color coated plate will be produced according to
Test methods for color coated steel plates and strips
Conduct T-bend test. Then, the sample is stored in the laboratory environment for 6 months and taken out, and the T-bend test is also carried out to obtain the aging performance of the coating adhesion of the sample for half a year. 1.2 prediction of coating adhesion and aging performance of color coated plates
Test methods for color coated steel plates and strips
Conduct T-bend test. Then put the sample into the constant temperature and humidity test chamber for 24 h accelerated aging test, and the test temperature is 70 ℃
, The relative humidity of the test is 95%. The water molecules on the surface of the test coating can reach the coating metal matrix interface through adsorption, diffusion and infiltration, until the coating / metal matrix bonding interface is damaged. The initial macroscopic manifestation of this interface failure may be the decrease of coating adhesion, which is manifested in the poor aging performance of coating adhesion, and its further macroscopic manifestation is coating blistering and falling off. Therefore, the corrosion resistance of the color coated plate can be predicted through the experimental results of the adhesion and aging performance of the color coated plate, which has a good early warning effect on improving the product quality of the color coated plate.