彩涂板背面的涂料附着力差原因
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彩涂板背面的涂料附着力差。产生这些问题的主要原因如下：
（1） 胶反应时间：用户加工时胶反应时间的长短影响发泡效果，发泡过长或过短的效果不理想，如图2-（a）所示，是发泡时间不当的一个样本
（3） 胶质：发泡胶一般由黑胶和白胶组成。白胶为含羟基的聚醚多元醇，黑胶为氰酸酯。两者按一定比例混合形成聚氨酯，称为发泡材料。胶水中的有效成分严重影响产品的发泡效果。为了降低成本，在白胶中加入其他物质或用价格较低的聚酯多元醇代替聚醚多元醇，都有可能造成发泡不良
The coating on the back of the color coated plate has poor adhesion. The main reasons for such problems are as follows:
(1) Glue reaction time: the length of glue reaction time when users are processing affects the foaming effect, and the effect of too long or too short hair bubbles will not be ideal, as shown in Figure 2 - (a), which is a sample of improper foaming time
(2) Coating quality: the type of coating determines the surface activity of the coating after curing, which will affect the foaming effect of the color coating plate and foaming agent. If the active group of coating is less, the foaming property will
be affected. It is a bad sample of coating foaming with less active groups.
(3) Glue quality: the foaming glue is generally composed of black glue and white glue. The white glue is polyether polyol with hydroxyl group, and the black glue is cyanate
ester. The two are mixed in a certain proportion to form polyurethane, which is called foaming material. The effective components in the glue seriously affect the foaming effect of the product. In order to reduce the cost, adding other substances in the
white glue or replacing polyether polyol with polyester polyol with lower price are likely to cause poor foaming
(4) Others: foaming process and production environment are also important factors affecting the quality of sandwich panel products.
