Analysis of Reasonable Water for Electrophoretic Coating Pretreatment
China's freshwater resources are very scarce. Per capita freshwater resources are less than one-fourth of the world's per capita and their distribution is extremely uneven. More than 400 of the country's large and medium-sized cities are water scarce. However, there are multiple processes that use fresh water in the pre-treatment of the coating production line, so now we will discuss how to save water?
How should we save water before cleaning? To what extent is it reasonable to dispose of cleaning water?
For the pre-treatment water of the coating production line, its cleanliness is very important, so can our current water quality indicators meet the quality requirements?
In addition to understanding the importance of the process, we also need to understand the origin of this process and understand the most essential things. The more we can come up with practical solutions, the more we can make a breakthrough.
We know that some soluble salts in water have an effect on the corrosion resistance of the product, and insoluble salts have an effect on the adhesion. So to what extent do different concentrations affect it? What is the reasonable range we are looking for?
As far as electrophoretic coating is concerned, we can see the following changes. These changes may put forward new requirements for previous standards and processes.
Change one: housing conditions. The ratio of buildings to bungalows, relatively dry living space, metal corrosion will be reduced;
Change two: gas conditions. Compared with the coal-burning kitchen environment, metal corrosion will be reduced in the natural gas environment.
The inspection of coating performance comes from two aspects: the laboratory method and the product market performance method, thereby determining the rationality of the process and establishing the use of fresh water. The conditions of the laboratory are relatively easy to meet, but the market performance of the product is rarely investigated, let alone the adjustment of the process lag.
The current status of pretreatment freshwater utilization is basically as follows:
1. The addition of tap water depends on the pressure control of the water pipe or the design of the production line, and few people raise objections;
2. The discharge of washing water depends on the mood of employees, and some processes require that the water be changed daily;
3, the water reuse rate is very low, usually directly discharged, there is no good habit of recycling.
At the same time, seemingly clean water is sometimes unsuitable for painting applications (such as water with dissolved NaCl), while water that looks very dirty may not necessarily be unusable (such as water containing painting coatings). Control or eye sensory control has unscientific factors and there is room for improvement. Because water consumption also means an increase in product costs, it is possible for companies to adjust the pre-treatment water use method to generate a certain profit margin.
This time we mainly analyze so much. In later articles, Hongheshun Electrophoretic Paint Co., Ltd. will continue to analyze how to save water and how to recycle water. Follow us and learn more about electrophoretic coating technology.