Nucleating agent is a new function of improving the physical and mechanical properties such as transparency, surface gloss, tensile strength, rigidity, hot deformation temperature, impact resistance and creep resistance of products by changing the crystallization behavior of resin, accelerating the crystallization rate, increasing the crystallization density and promoting the grain size refinement Agent.
Nucleating agent, as the modifier of polymer, its mechanism is mainly: in the melting state, because nucleating agent provides the required crystal nucleus, the polymer transforms from homogeneous nucleation to heterogeneous nucleation, thus accelerating the crystallization speed, refining the crystal structure, improving the rigidity of the product, shortening the molding cycle, maintaining the dimensional stability of the final product, and inhibiting light scattering Improve the transparency, surface gloss and physical and mechanical properties of the polymer (such as rigidity and modulus), shorten the processing cycle, etc. As an important kind of nucleating agent, the main function of transparent agent is to improve the optical effect of polymer. In China, the research and development of nucleating agents began in the 1980s. There are many kinds of nucleating agents. Now, the practical, cheap and commercialized nucleating agents can be divided into inorganic nucleating agents, organic nucleating agents and polymer nucleating agents. In addition, the conversion of α – to β – crystallizers in PP is also generally summarized in nucleating agents.
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