Reaction between masterbatch and resin

Technical Information, 09-28-2018

The influence of masterbatch on plastic products is reflected in its reaction with raw materials and other components of plastic products, as well as its dispersion, heat resistance, migration resistance, weather resistance and toxicity. Today we mainly talk about the reaction between this product and resin:
The reaction between masterbatch and resin is mainly reflected in the chemical reaction between some pigments or dyes and resin during processing and molding. These reactions may lead to the change of color phase, which may degrade the polymer, and thus change the product performance. For example, nylon and amino plastics are strong acid reducing agents in the molten state. They can make pigments and dyes that are stable at the processing temperature fade. Similarly, phenolic plastic can act as a strong alkaline reducing agent. The alkali metals in the polyvinyl chloride lotion polymer or some stabilized polypropylene can "alkali exchange" with the alkali earth metals in the color master batch to change the color from blue red to orange red. Ultramarine pigments and zinc and iron compounds are highly reactive with hydrochloric acid, and they are not suitable for coloring PVC and polyolefin polymers containing halogen flame retardants.
Pigments in some masterbatch can damage the polymer, for example, manganese lake pigment is not suitable for the coloring of polypropylene products, because variable valence manganese ions cause accelerated aging of polypropylene through the transfer of electrons in the thermal oxidation or photooxidation of polypropylene; The vinegar bond in polycarbonate vinegar is easy to be hydrolyzed and decomposed in alkali when heated. If it contains metal ion pigment, its decomposition can be accelerated; Metal ions will also promote the thermal oxygen decomposition of PVC resin, and lead to the color change of products.
The acidity and alkalinity of pigments in masterbatch components also often have an impact on acid and alkaline resins. For example, carbon black in alkaline form is more likely to lead to the thermal decomposition of polycarbonate vinegar, while carbon black in acidic form is more likely to lead to the thermal decomposition of polyformaldehyde.