Calcium carbonate has been used as an inorganic filler in plastic filling for many years. In the past, calcium carbonate was generally used as a filler for the main purpose of reducing costs, and received good results. In recent years, with the extensive use in production and a large number of research findings, filling a large amount of calcium carbonate can also not significantly reduce the performance of the product, and even greatly improve some aspects, such as mechanical properties, thermal properties, etc.
In the actual use process, calcium carbonate is generally not directly added to the plastic. In order to make the calcium carbonate evenly dispersed in the plastic and play a role in optimizing the performance, the surface activation treatment of the calcium carbonate must be carried out first.
According to the molding process and performance requirements of the final plastic product, calcium carbonate with a certain particle size is selected, first activated and treated with auxiliary agents such as coupling agent, dispersant, lubricant, etc., and then a certain amount of carrier resin is added to mix evenly. Screw extruder to extrude and granulate to obtain calcium carbonate film masterbatch. In general, the calcium carbonate content in the masterbatch is 80wt%, the total content of various additives is about 5wt%, and the carrier resin is 15wt%.
The addition of calcium carbonate can greatly reduce the cost of plastics
Calcium carbonate is extremely abundant and its preparation is very simple, so the price is relatively cheap. In terms of special materials for pipes, the price of polyethylene (with carbon black) at home and abroad is high, and the price is very different from calcium carbonate. The more calcium carbonate is added to the plastic, the lower the cost.
Of course, calcium carbonate cannot be added indefinitely. Considering the toughness of plastic products, the filling amount of calcium carbonate is generally controlled within 50wt% (data provided by calcium carbonate filler manufacturers). For the production of plastic and steel-plastic composite pipes, plastics are the main raw materials, and greatly reducing the cost of plastics will undoubtedly greatly reduce the production cost and be beneficial to the improvement of profits.
Post time: Oct-09-2022