Why is recycled wax less unstable than filled wax?

2020-04-17 09:06:01 843

There are two kinds of new wax, one is rosin based new wax, and the other is non rosin based new wax. Because of its chemical structure, rosin contains conjugated double bonds and combines with electronic absorption groups, making the chemical properties of rosin very unstable, easy to oxidize and deteriorate. In addition, the presence of oxygen atoms in the carboxyl group makes rosin difficult to dehydrate. Therefore, rosin is not an ideal raw material for research and production of precision casting wax.






There are two kinds of new wax, one is rosin based new wax, and the other is non rosin based new wax. Because of its chemical structure, rosin contains conjugated double bonds and combines with electronic absorption groups, making the chemical properties of rosin very unstable, easy to oxidize and deteriorate. In addition, the presence of oxygen atoms in the carboxyl group makes rosin difficult to dehydrate. Therefore, rosin is not an ideal raw material for research and production of precision casting wax.






Since there are millions of organic compounds, stable investment casting wax can be produced without rosin. The key is to find suitable raw materials. "Qingdao Xinke Casting Material has successfully developed a new type of precision casting wax based on the introduction of British advanced technology, combined with the needs of domestic precision casting manufacturers, avoided the use of rosin based raw materials, and used the same raw materials as foreign advanced products. The outstanding advantage of this product is that it does not need to place cold wax blocks, and thick large and thin wall parts do not need to adjust the insulation temperature and wax injection temperature, so that thick large and thin wall parts Pieces can be completed on the same wax remover.






So why is the recovered wax unstable? In the United States, Europe and other developed countries, in order to ensure the accuracy of castings, only one packaging wax is used. If dewaxing and dehydration are performed, the filler will precipitate and discharge. Once this happens, the dimensional accuracy of medium temperature wax cannot be guaranteed, so only one packaging wax is used. Due to the high labor cost in developed countries, in order to ensure the yield of products, unpacked wax with a melting point 2 ℃ lower than that of packaging wax is used. Foreign investment foundries are not engaged in wax recovery. They send the wax to a special wax recovery company for regeneration, which shows that there is no way to ensure the stability of the composition. The stability of raw material composition determines the stability of shrinkage.






The properties of the recovered wax are equivalent to those of the steel used in our foundry. It comes from material recycling companies, not standard steel produced by steel mills. It can be seen that their raw material composition is unstable, so the performance of recovered wax must be unstable. In production, each factory will produce a small amount of waste wax, and the production of recycled wax is no exception. Some people say that we have not changed the wax. Why is the production unstable? It is inexplicable. It is understandable that manufacturers and suppliers of recycled wax are actually replacing wax every day. Our foundry does not know because they use the same packaging.


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