Masterbatch is a new type of macromolecule material coloring agent of this superior coloring performance, but the masterbatch in the use of the process there will be some problems, let's look at the specific reasons and solutions:
First, under the sun, the product has a striped paint with:
From the physical properties of plastic and plastic molding process from two aspects:
Injection molding equipment temperature is not controlled, masterbatch into the mixing chamber can not be fully mixed with the resin;
Injection molding machine without a certain amount of back pressure, screw mixing effect is not good;
Masterbatch dispersion is not good or resin plasticization is not good.
Process can be used for debugging as follows:
The mixing chamber by the expected part of the temperature slightly increased;
Impose a certain back pressure on the injection molding machine.
If the above debugging is still not good, it may be masterbatch, resin dispersion or matching problems.
2, the use of a masterbatch, the product appears to be more prone to rupture:
The choice of dispersants or additives poor quality caused by poor diffusion miscibility, affecting the physical and mechanical properties of products.
3, according to the proportion of masterbatch after use, too dark / too light:
Although the problem is simple, there are many possibilities:
Masterbatch without serious color test, pigment too little or too much;
Inaccurate use of measurement, the domestic enterprises, especially small and medium enterprises random measurement of the phenomenon of existence;
Masterbatch and resin matching problems, which may be masterbatch carrier improper choice, it may be manufacturers are free to change the resin varieties;
Improper machine temperature, Masterbatch residence time in the machine is too long.
Processing procedures: First check whether the variety of resin matches masterbatch, the measurement is accurate, followed by adjusting the machine temperature or speed.
4, the same color masterbatch, resin and formula, the injection of different products why the color depth of the product?
This is often the cause of the injection molding machine caused by the different injection molding machine due to the manufacture, use of time or maintenance of different conditions, resulting in differences in mechanical conditions, especially heating the original and the barrel of the close degree of difference, the masterbatch in the material Dispersion in the barrel is not the same.
5, Masterbatch occurred in the storage of pigment migration phenomenon will affect the quality of products?
Some color masterbatch pigment content (or dye) is very high, in which case, the migration phenomenon is normal, especially the dye masterbatch, there will be a serious migration phenomenon, but this does not affect the quality of the product, because the color After the mother is injected into the product, the pigment is at a normal coloration concentration in the product.
6, for another brand of resin, the same masterbatch and formula, the color has changed, which is why?
Different brands of resin density and melt index will be different, so the performance of the resin will be different, and masterbatch compatibility will be different, resulting in color change, in general, as long as the density and melt index difference is not Big, so the difference between colors will not be too large, you can adjust the amount of masterbatch to correct the color.
7, why some injection products gloss is not good?
There are many possibilities:
Injection molding machine nozzle temperature is too low
Injection molding machine mold finish is not good
Product molding cycle is too long
Masterbatch contains too much titanium dioxide
Masterbatch dispersion is not good
8, after a period of time, some plastic products will fade phenomenon:
The use of basic pigment quality is not good, drift phenomenon occurred.