1. What is the cause of acid storage after the anode of nano-injection products?
At the China Polymer Forum, a netizen suggested: What is the cause of the acidity of the product after the nano-injection product anode? How to solve it?
When the problem is thrown, there are other netizens replying. The netizen said that he also encountered the same problem. He said: There is a product that has a product thrust of half after the second yang!
Ten processes for anodizing
User B said:
The root cause of the acid is the gap between the aluminum and plastic. No matter how good the combination is, the microscopic bonding gap cannot be avoided. In the chemical polishing process in the anodizing process, the metal and plastic change in temperature due to the principle of thermal expansion and contraction. The degree of shrinkage is different, resulting in cracks. A small amount of polishing agent (generally a mixture of high concentration nitric acid, sulfuric acid and phosphoric acid) will penetrate into the micro slit and is not easy to clean out; in the sulfuric acid anolyte, a small amount of acid will infiltrate due to long time electrolysis; even after cleaning In the dyeing and sealing process in the post-process, there will still be residual acid outflow, and the dye will turn white when it meets acid, that is, it is white. In particular, the sealing process is also a high temperature, and the principle of thermal expansion and contraction causes acid bleed to break the dye to form white.
Second, how should it be solved?
Knowing the root cause of sardine, we can prescribe the right medicine! The solution is not only given a process to be fully controlled, but requires more detailed control. Mainly divided into two aspects:
1. Reduce or eliminate acid leakage
First, when selecting metal and plastic materials, the shrinkage ratio of the two should be as equal as possible; in general, the shrinkage of the plastic can be changed to make it close to the metal material by changing the proportion of the reinforcing material such as glass fiber.
Second, optimize the parameters of the injection molding to reduce injection defects.
Finally, avoid temperature rise or fall too fast and avoid cracks.
2. Remove residual acid
Four factors that determine the dyeing effect, source four-dimensional chemical
Prior to dyeing, the permeated acid is neutralized using a surface conditioning agent and ultrasonically treated to drive out the acid in the crack.
In actual production, people tend to use the method of adjusting the ultrasonic wave with the surface. In fact, the first method is preventive, and the second method is only a remedy. So, the solution is not just a process that can be fully controlled, it requires more detailed control.
UV Birch Plywood,UV Prefinished Plywood,UV Coated Birch Plywood,UV Finished Birch Plywood
LINYI JIUHENG IMP&EXP CO.,LTD , https://www.jiuhengwood.com