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彩涂板底漆的特征以及怎样才能达到高速生产的要求

返回列表 来源: 发布日期: 2019.10.17

彩涂板底漆的特征以及怎样才能达到高速生产的要求

彩涂板底漆_彩涂板西安代理_天物彩板

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目前,彩涂板最常用的环氧底漆是以双酚A为基础的E-06或E-03环树脂,其配方与早期的主要区别在于其二氧化钛含量低,使用安全剂。使用效果好,但价格高。
随着技术的不断进步,彩涂板的生产线速度越来越快,涂料的固化时间,即在固化炉中的停留时间趋于缩短,因为生产线的速度取决于涂料的固化时间。如果采用炉体或热源的增加来减少底漆的固化时间,会增加彩涂单元的成本,这是不经济的。因此,有必要提高底漆的反应速率。此外,还应考虑漆膜离开固化炉后的柔韧性。当底漆通过后续的导向辊时,不充分的固化涂层将被拉下并落在辊上。为了克服这一问题,在环氧底漆中加入脲醛树脂。降低柔韧性不显著,但用更为昂贵的三聚氰胺甲醛树脂代替脲醛树脂是不划算的。
为了降低原料成本,底漆中二氧化钛含量低于以前。为了在较高的生产线速度下提高底漆的施工性能,应降低底漆的粘度,但这会增加颜料沉积的问题,特别是铬酸锶。减少颜料在不透明底漆上层的分布,会产生深色底漆层,这就增加了亮色混合的难度。为了克服这一问题,需要在配方中加入抗沉降剂,其中包括疏水性热解二氧化硅。它不仅有助于防止沉降,而且有助于环氧底漆的防锈性。
当环氧底漆与聚偏氟乙烯面漆一起使用时,面漆必须涂漆。应特别小心,因为含氟聚合物,如果它们含有70%的基材,将穿透紫外线。因此,这种涂料必须与颜料精心搭配,以阻挡紫外线的传播,否则会到达底漆处而引起粉化,从而导致随后的层间粘合问题。以环氧树脂和酚醛树脂为基料,制备了聚偏氟乙烯面漆专用底漆,以提高底漆的耐酸雨性能。
对于彩涂板的基材,除了热浸镀锌钢板外,还可以采用一些替代基材,如锌铝合金基材。为此,需要增加底漆配方中铬酸锶的含量,以保持良好的耐腐蚀性,特别是在后处理过程中暴露的切割边缘周围。

At present, the most commonly used epoxy primer for color coated plates is the e-06 or e-03 ring resin based on bisphenol A. the main difference between its formula and the early stage is that its titanium dioxide content is low, and a safer agent is used. The effect is good when it is used, but its price is high.

With the continuous progress of technology, the production line speed of color coated plate is increasing, and the curing time of coating, that is, the residence time in curing furnace, tends to reduce, because the speed of production line depends on the curing time of coating. If the increase of furnace body or heat source is used to reduce the curing time of primer, the cost of color coating unit will be increased, which is not economical. Therefore, it is necessary to improve the reaction rate of the primer. Besides, the tenderness of the paint film after leaving the curing furnace should also be considered. When the primer passes through the subsequent guide roller, the insufficient curing coating will be pulled off and fall on the roller. In order to overcome this problem, urea formaldehyde resin will be added to the epoxy primer. The reduction of flexibility is not significant, but it is not very cost-effective to replace urea formaldehyde resin with melamine formaldehyde resin which is more expensive.
In order to reduce the cost of raw materials, the content of titanium dioxide in the primer is lower than before. In order to improve the construction performance of primer at a higher production line speed, the viscosity of primer should be reduced, but this will increase the problem of pigment deposition, especially strontium chromate. Reducing the distribution of pigment in the upper layer of opaque primer will produce a dark color primer layer, which makes it more difficult to mix bright colors. In order to overcome this problem, anti settling agent needs to be added to the formula, which includes hydrophobic pyrolysis silica. It not only helps to prevent settling, but also helps the rust resistance of epoxy primer.
When the epoxy primer is used with the polyvinylidene fluoride finish, the finish must be painted. Special care should be taken because fluoropolymers, if they contain 70% of the base material, will penetrate ultraviolet light. Therefore, this kind of coating must be carefully matched with pigments to block the transmission of ultraviolet rays, otherwise it will arrive at the primer and cause pulverization, resulting in subsequent interlayer adhesion problems. A special primer based on epoxy and phenolic resin has been prepared for the application of polyvinylidene fluoride finish, so as to improve the performance of the primer against "acid rain" environment.
For the substrate of color coated plate, in addition to the hot-dip galvanized steel plate, some alternative substrates can be used, such as zinc aluminum alloy substrate. For this, it is required to increase the amount of strontium chromate in the primer formula to maintain good corrosion resistance, especially around the exposed cutting edge in the post-processing.

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