The collocation relationship between pigment and plastic material and auxiliaries

- Jan 25, 2018 -

Color Masterbatch, color Masterbatch technology must pay attention to the color and plastic materials, auxiliaries, the collocation relationship between the selection of the main points described below.


1, the pigment can not be with the resin and a variety of additives have a reaction, strong solvent resistance, small mobility, good heat resistance and so on.


In other words, the masterbatch can not participate in a variety of chemical reactions. Such as carbon black can control the curing reaction of polyester plastic, so can not add carbon black material in the polyester.


Color Masterbatch technology because of the high temperature of the molding process of plastic products, so the color should be in the molding heating temperature conditions do not decompose color.


General inorganic pigment heat resistance is good, organic pigments and dyes poor heat resistance, this should be in the selection of color materials to attract enough attention.


2, the dispersion of the pigment, the coloring force should be good.


When the pigment dispersion is uneven, it will affect the appearance performance of the product, and the coloring force of the pigment will increase the amount of pigment and material cost. The same color material in the same resin dispersion followed by the color force is not exactly the same, so you should pay attention to this when choosing color materials. The particle size of the pigment is also related to the dispersibility, the smaller the particle size of the pigment, the better the dispersibility and the stronger the coloring force. Color Masterbatch technology requirements are very strict, the general adoption of color Masterbatch technology is wet process. Masterbatch materials by the water phase grinding, phase, washing, drying, granulation, but only such product quality can be guaranteed.


There are four ways to process the Masterbatch technology


(1) Color Masterbatch Technology Ink method: As the name implies, is in the production of color masterbatch to adopt ink paste production method, that is, through the three-roll grinding, coating a layer of low molecular coating on the surface of the pigment. After grinding the fine paste and the carrier resin mixed, and then through the two-roll mixer (also called double Roll Open mixer) for plasticizing, and finally through a single screw or twin-screw extruder to granulation.


(2) Color Masterbatch technology Process flushing method: is the pigment, water and dispersant through the sand mill, so that pigment particles less than 1μm, and through the phase transfer method, so that the pigment into the oil phase, and then dry to make color masterbatch. It is necessary to use organic solvents and the corresponding solvent recovery device in the phase transfer.


(3) Color Masterbatch Technology Kneading method: is the pigment with oily carrier mixed, the use of pigment lipophilic, the characteristics of the paint from the water phase to flush into the oil phase. At the same time, the surface of the pigment coated with oily carrier, so that pigment dispersed and stable, to prevent pigment condensation.


(4) Color Masterbatch technology Process Metal SOAP method: is the pigment after grinding particle size reached 1μm around, and at a certain temperature to add soap, so that each pigment particle surface layer evenly wetted by the soap, forming a layer of saponification liquid, when the metal salt solution added to the surface of the pigment in the saponification layer of chemical reaction to generate a layer of metal soap Protection ( Magnesium stearate), so that after grinding the pigment particles will not cause flocculation phenomenon, and protect a certain degree of fineness.


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