All kinds of coatings, especially baking polymerization drying coatings, have a prescribed baking temperature range and time. The prescribed baking conditions need to be strictly followed. If the temperature is lower than the lower limit of the baking conditions and the baking time remains unchanged, the crosslinking reaction will be too slow or the crosslinking will not react at all, and the protective effect of layer removal will be lost; if the temperature exceeds the specified upper limit and the time is too long, it may The disadvantages such as pigment decomposition or polymer cracking of film-forming substances are produced. Such as amino alkyd baking varnish. After baking at 100-120℃ for 2 hours, the amino resin in the coating film can form a network structure through the crosslinking reaction between the butoxy group and the hydroxyl group in the alkyd resin, improving weather resistance and water resistance. If the conditions of residual baking are violated, even though it looks like it has dried and formed a film, the actual coating has not been fully cross-linked, and its weather resistance, water resistance and three-proof performance cannot be guaranteed.
For general coatings, except for special varieties, their baking temperature range is basically 80~150°C and corresponding baking time. In this range of baking conditions, if you want to change the temperature and time, you need to follow the basic laws of baking conditions. , For example, if the general temperature increases or decreases by 14°C, the baking time will be shortened or extended by 30 minutes. White will reflect heat energy. At the same temperature, the baking time can be extended appropriately. The polished metal painting coating can extend the baking time About 20%, the baking time of copper and aluminum products is slightly longer than that of ferrous metal products. These reference data are not only helpful for daily construction, but also can be used as a reference for the design of assembly line production equipment such as drying tunnels.
