造成彩涂板缩孔的原因及解决方法

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彩涂板的收缩是指涂料烘烤后，彩涂辊表面形成小凹坑的现象。收缩的原因是涂层表面张力过高会导致涂层收缩。在涂料的实际应用中，这个问题比较普遍，主要是因为涂料对基材的润湿性不好。如果涂层的表面张力过大，使湿膜在干燥前形成均匀的涂层，严重时会使基材外露，从而形成收缩现象。一般来说，收缩现象比较严重。
彩涂板收缩的原因及解决方法
解决方案：
一是在涂装前尽可能清洁彩涂板表面，以减少油污、灰尘等杂物对涂装性能的影响；
另一种是使用表面张力控制剂或一些具有良好润湿效果的溶剂来降低涂层的表面张力，使其尺寸接近基材表面的自由性能。
彩涂辊是由热镀锌板、热镀锌铝锌板、电镀锌板等经表面预处理（化学脱脂、化学转化处理）后，在表面涂一层或几层有机涂层，然后烘烤固化而成的产品。也因为有不同颜色的有机涂层彩钢卷盘由此得名，称为彩涂卷盘。除锌层保护外，锌层上的有机涂层对以热镀锌钢带为基材的彩涂钢带起到覆盖和保护作用，防止钢带生锈，使用寿命约为镀锌钢带的1.5倍。彩涂辊重量轻，外观美观，防腐性能好，可直接加工。颜色一般分为灰白色、海蓝色和砖红色，主要用于广告、建筑、家电、电器、家具和交通运输等行业。聚酯：附着力好，颜色丰富，成型范围广，室外耐久性好，耐化学性中等，成本低。

The shrinkage of color coating plate refers to the phenomenon that small pits are formed on the surface of color coating roll after the paint is baked. The reason of shrinkage is that too high surface tension of the coating will cause shrinkage of the coating film. In the practical application of the coating, this problem is relatively common, mainly because the wettability of the coating to the substrate is not good. If the surface tension of the coating is too large to make the wet film form a uniform coating before drying, it will cause the substrate to be exposed in serious cases, thus forming the shrinkage phenomenon. Generally, the shrinkage phenomenon is more.

Causes of shrinkage of color coated plate and Solutions
resolvent:
The first is to clean the surface of the color coated plate as much as possible before the coating, so as to reduce the impact of oil, dust and other debris on the coating performance;
The other is to use a surface tension control agent or some solvent with good wetting effect to reduce the surface tension of the coating, so that its size is close to the free performance of the substrate surface.
Color coatin roll is a product made of hot-dip galvanized plate, hot-dip aluminum zinc plate, electro galvanized plate, etc. after surface pretreatment (chemical degreasing and chemical conversion treatment), one or several layers of organic coating are applied on the surface, and then baked and solidified. Also because there are different colors of the organic coating color steel coil plate from this name, referred to as color coated coil. In addition to the protection of zinc layer, the organic coating on the zinc layer plays a role in covering and protecting the color coated steel strip with hot-dip galvanized steel strip as the base material, preventing the steel strip from rusting, and the service life is about 1.5 times longer than that of the galvanized steel strip. Color coated roll has light weight, beautiful appearance and good anti-corrosion performance, and can be processed directly. The color is generally divided into gray white, sea blue and brick red, which are mainly used in advertising, construction, home appliance, electrical appliance, furniture and transportation industries. Polyester: good adhesion, rich color, wide range in molding and outdoor durability, medium chemical resistance, low cost.