Saturday, August 18th, 2012
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Out-gas and adhesion problems in powder coat zinc casting
zinc casting can be powder coated. A cast part will have porosity that may cause blemishes in the coating at high temperature. Air that is trapped near the surface may expand and rupture the film during the cure process. There are several ways to mitigate the issue. You can preheat the part to drive off some of the trapped air that causes the problem. Heat the part to a temperature about 50°F greater than the cure temperature, cool it down, andRead More …
Introduction of Plasticizers in Coating Formulations
Plasticizers are used to control the film formation process of coatings based on physically drying film forming materials. Proper film formation is essential in order to meet demands on specific coating properties such as dry film appearance, substrate adhesion, elasticity, in combination with high level of hardness at the same time. Plasticizers function by reducing film formation temperature and elasticize the coating; plasticizers work by embedding themselves between the chains of polymers, spacing them apart (increasing the “free volume”), andRead More …
Elements of a burning explosion of powder coating
The following aspects are the factors that cause the burning explosion of powder coating: (A) The dust concentration exceeds the lower limit For these reasons, resulting in the powder room or workshop dust concentrations exceed the lower explosive limit, so that the formation of the main conditions of the powder combustion and explosion, if moderate sources of ignition, it is very likely to produce combustion and explosion. (B) Powder and paint shop to mix In some factories, due to lessRead More …
D5 Creation