When studying a material, one problem that should be noted is that the structure of the material determines the properties of the material and the properties of the material reflect the structure of the material. In the molding of polycarbonate, the molecular chain is forced to be oriented, but since the polycarbonate has a benzene ring on the molecular chain, the orientation is difficult to be solved, and after the molding, the oriented chain has a tendency to restore the natural state, but The molecular chain has been frozen and the macromolecule chain is between each Other, which causes residual stress in the product, and the existence of residual stress causes stress cracking of the product. Note that it is possible here, why is it possible? This is because there are still many forces inside the polycarbonate, and among them, the most important one is the anti-cracking force. The magnitude of this force depends on the length of the molecular chain, the number of entanglements between the chains, and the force between the molecules. When the anti-cracking ability and internal stress balance, the product will not crack, and when the anti-cracking ability is less than the internal stress, it will appear: Why is the product still good when it is formed, and it will crack after being stored for a while? Is it the magic of heaven? In fact, it is not magic, but the result of internal stress and anti-cracking force. Well, this simple word: benzene ring on the molecular chain - molding orientation - internal stress after molding - when internal stress and crack resistance Balance - good products - when the internal stress is greater than the resistance to cracking - product cracking.
If you have such a problem, you are not willing to see it. You can't find a supplier trouble if you have a problem. Instead, look for a supplier to solve the problem together. Yes, it is good to have such an attitude. Now let's discuss how to solve the problem. Solve it from the process:
Look at the mold temperature. From the above obscurable theories, it is known that the internal stress is caused by the freezing of the molecular chain during molding. Is it formed by molding, of course, it has already been thought of, right, the temperature of the mold is frozen and the molecular chain is oriented. It has a great influence. Is it obvious that the higher the mold temperature, the molecular chain is definitely easy to move? It is like the fact that water molecules will "fly" at 100 degrees. Therefore, increasing the mold temperature is not only beneficial to the die, but also the problem. The product is cooled to a more uniform rate to facilitate relaxation of the oriented molecules in the polycarbonate, i.e., de-orientation. After talking for a long time, how much is the temperature of the mold? Don't worry, if the mold temperature can be controlled, the optimum temperature for forming polycarbonate is 100-120 degrees.
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