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Why does PC endurance board crack?

by:UNQ     2021-04-05
The endurance board will crack, so what kind of plastic sheet, such as endurance board, PS board, etc., can produce such a phenomenon? The phenomenon of stress cracking in the endurance board is mainly determined by the structure and performance of the material of the endurance board. Because when we co-extrude the endurance board, the molecular chain will be forced to orient, and because the polycarbonate molecular chain has a benzene ring, de-orientation will become more difficult. Therefore, after molding, the oriented chain may still return to its natural state, but since the entire molecular chain has been frozen and the macromolecular chain is about each other, there will be residual stress in the product, which will eventually result in a resistance plate The product may appear stress cracking. However, this is not true, because there are many different forces inside the polycarbonate, such as crack resistance. The length of the molecular chain, the number of entanglements between the chains, and the force between molecules are all the key factors that determine the magnitude of this force chain. Therefore, as long as we ensure that the anti-cracking ability and internal stress reach a balance, the cracking phenomenon of the endurance board will not occur.

Endurance board is a building material with good performance, which can be used for heat insulation, sound insulation, etc. But when we actually use it, we will find that the endurance board is prone to stress cracking. What is going on? Is there any way to solve it? So how can we balance the anti-cracking ability and internal stress? It is to increase the mold temperature of the endurance board, because the higher the mold temperature, the easier the molecular chain can move, which is beneficial to the relaxation of the oriented molecules in the polycarbonate. After testing, the maximum temperature of the endurance board mold is controlled at about one hundred to one hundred and twenty degrees.

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