How to choose the right dispersant

1: Determine the grinding resin system

According to Kain Chemical’s many years of experience, long oil alkyd resin, amino resin, polyamide resin, aldehyde ketone resin, low molecular weight hydroxypropylene and other resins are suitable for Pigments all have good wettability, while high molecular weight saturated polyester resin, low hydroxyl value hydroxypropylene, thermoplastic acrylic resin, etc. have poor wettability to pigments. The same pigment will show different performance in different resin systems. The hue of organic pigments, carbon black and transparent iron oxide will be different in different resins, especially the diffuse hue. Therefore, when selecting a dispersant, in order to accurately adjust the color, it is necessary to test according to the resin system. The compatibility of the dispersant and the resin, the viscosity reducing effect of the dispersant in the system, the color development and storage stability of the dispersant in the system.

2: Choose based on pigments and fillers

Pigments are divided into several categories, namely organic pigments, inorganic pigments and carbon black

If the same resin and a dispersant can well disperse carbon black and phthalocyanine pigments at the same time, then it will perform better in DPP red organic pigments to a large extent. On the other hand, if a dispersant shows good dispersing ability for organic pigments such as DPP red, then using it to disperse carbon black or phthalocyanine blue will cause color difference or poor viscosity reduction.

This is most likely due to the strength of the hydrogen bonds of the pigment itself. Therefore, it is difficult to obtain high performance results in two different types of pigments using a single-structure dispersant. Good results. When actually choosing a dispersant, you must comprehensively consider it based on the parameters given by the pigment manufacturer. The most direct way is to apply it. However, as we continue to summarize the experience of application experiments, we will eventually avoid many detours. We welcome colleagues and friends to communicate. .