Barium sulfate has unique and excellent properties, making it widely used. It is a new functional modification material for plastics. Modified barium sulfate significantly improves chemical corrosion resistance, heat resistance, and product appearance. It can be used in household appliance shells, mechanical parts, automotive components, air conditioner panels, and electric kettle shells. Barium sulfate also increases plastic density, enhances wear resistance, anti-aging, and improves gloss, expanding its application in plastics. Modified barium sulfate usually has the following eight advantages when used in the plastics industry:
Reduce costs
Fillers are usually cheaper than resins, so increasing fillers can significantly reduce plastic costs, offering notable economic benefits. This is the main reason for the widespread use of plastic filling modification.
Improving the heat resistance of plastics
Plastics generally have low heat resistance, such as ABS, which has a long-term use temperature of only around 60°C. Most fillers are inorganic and have higher heat resistance. Adding these fillers significantly improves the heat resistance of plastics. For example, PP, when unfilled, has a heat distortion temperature of around 110°C, but when filled with 30% talc or barium sulfate, its heat distortion temperature can be increased to over 130°C.
Improving the rigidity of plastics
Plastics generally have poor rigidity. For example, the flexural modulus of pure PP is around 1000 MPa, which is insufficient for some applications. After adding 30% barium sulfate or talc, the flexural modulus can reach over 2000 MPa, demonstrating the significant reinforcing effect of talc.
Improve the molding processability of plastics
Some fillers, such as barium sulfate and glass microspheres, can improve the processability of plastics by enhancing the flowability of the resin, thus improving its processability.
Improve the dimensional stability of plastic products
Some plastics have large crystallization shrinkage, causing a high shrinkage rate in the final product, which can lead to deformation and unstable dimensions after leaving the mold. Adding fillers can significantly reduce the shrinkage rate, further improving the dimensional stability of plastic products and components.
Improve the hardness of plastic surface
Plastics generally have low hardness, making their surface prone to scratches, which affects appearance and surface performance. Inorganic fillers have higher hardness than plastics, and adding these fillers can significantly improve the surface hardness of plastics.
Improve plastic strength
General-purpose plastics have low tensile strength. Adding inorganic fillers, within an appropriate range, can improve the tensile strength and flexural strength of plastics, thereby enhancing their engineering applicability.
Improving the added value of plastic products
Some fillers can impart specific functions to plastics. For example, adding barium sulfate, talc, or calcium carbonate to PP can improve its antistatic and printing properties. Hollow glass microspheres, when added to plastics, enhance their thermal insulation properties. Metal particles added to plastics can improve their thermal conductivity and electrical conductivity.
Conclusion
In conclusion, modified barium sulfate plays a crucial role in the plastic industry by enhancing the performance of various plastic products. Its ability to improve heat resistance, mechanical strength, dimensional stability, and surface hardness makes it an invaluable additive for applications in automotive parts, household appliances, and other engineering plastics. Furthermore, its versatility in improving properties like antistatic behavior and insulation capabilities ensures its continued importance in the development of high-performance plastic materials. As the demand for advanced materials grows, the use of modified barium sulfate is expected to expand, offering both technical and economic benefits.
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