At present, the research on plastic auxiliaries still focuses on the development of new varieties such as high efficiency, low toxicity, low cost and versatility. However, the mechanism of action of various auxiliaries is not enough, and further research and discussion are needed. The general research trends are as follows:
I. Research on high-stability additives The aging of polymers is still a major problem in plastics. The current research focuses on the research of anti-aging stabilizers for polyolefins, especially polypropylene, such as the research of antioxidants containing phosphorus polymers and multifunctional compounds; the continued study of hindered amines in light stabilizers; In addition to the series of products such as ester tin and methyl tin which have appeared in recent years, it is expected that new and highly effective stabilizers will appear.
Second, the study of new flame retardants Research on new varieties of flame retardants is still dominated by inorganic substances, magnesium hydroxide and molybdenum compounds are still relatively new varieties. The research on the combination of flame retardant and filling or other functions is still an important aspect; the suppression of plastic burning smoke is also an important subject for flame retardant research.
Third, the study of new coupling agents With the development of reinforced plastics and filled plastics, especially high-filled plastics, the application of coupling agents is more and more extensive, in addition to the traditional use of expensive titanates and silanes, Develop new varieties with low cost such as aluminate (DL-411D or DL-411-DF).
Research on processing modifiers Polypropylene, hard polyvinyl chloride, polysulfone, polyphenylene ether, polyphenylene sulfide, etc. can be changed by research on modifiers that can cut molecular chains and reduce the viscosity of polymer melts. Processing performance,
In recent years, oligomers with various auxiliaries have been introduced, which is a new trend worth noting. Since the oligomer contains both functional groups and reactive groups, it can be used for many aspects of the polymer. Modification. It has been reported that an oligomer and a polymer together form a plasticizing effect and a viscosity-increasing effect; and at a high temperature, cross-linking can also occur. The phenolic antioxidant with oligomer structure has good durability in plastic products due to its large molecular weight, good heat resistance and good extraction resistance.
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