General plastics generally refer to large production, wide use, good molding, cheap plastics, such as polyethylene, polypropylene, phenolic and so on. Many of the products people use in their daily lives are made of these common plastics.
General plastics have the advantages of good formability and low price, but their disadvantages such as easy aging and easy deformation bring many inconvenience to use. In order to overcome these shortcomings, it can be improved by modifying and adding precipitated barium sulfate to meet the needs of practical application.
Because of its unique and excellent properties, barium sulfate precipitated has been widely used as one of the new functional modified materials for plastic products. Precipitated barium sulfate has the characteristics of improving chemical corrosion resistance, heat resistance and appearance of plastic products.
In addition to these characteristics, precipitation of barium sulfate in the plastic modification process played a specific role in what?
1.Improve the rigidity of plastics. Usually the rigidity of plastics is poor. For example the flexural modulus of pure PP is about 1000MPa which is far from satisfying the application requirement of some parts. When 30% talc powder is added its flexural modulus can reach 2000MPa. It can be seen that talc powder has a remarkable toughening effect.
2.Improve the hardness of plastic appearance. Plastic hardness is usually low, the appearance easily scratched, affect the appearance, and then affect its appearance and decorative. The hardness of inorganic filler is higher than that of plastic.
3.Improve the dimensional stability of plastic products and components. Some plastic crystals shorten greatly, which results in large shortening rate of plastic products, which is easy to deform and unstable in scale after coming out of mould, and the shortening rate of plastics can be greatly reduced by adding fillers, and then the dimensional stability of plastic products and components can be improved.
4.To improve the formability of plastics. Some fillers can improve the processability of plastics, such as barium sulfate, glass beads, etc.
5.The strength of progress. The tensile strength of the general plastics is not high. When the inorganic filler is added, the tensile strength and flexural strength of the plastics can be improved within the range of the proper filling amount, and then the engineering applicability of the plastics can be improved.
6.Some functions are given to the plastics to improve the added value of plastic. Some fillers can give some functions to plastics, such as PP adding talcum powder and calcium carbonate to improve the antistatic and printing functions of PP; when the hollow glass bead is added to the plastic guessing, it can improve the thermal insulation function of the plastic; the metal particles can improve after the plastic guessing. The thermal conductivity and conductive function of plastic.