9 major problems and solutions for color masterbatch
Masterbatch is a new type of polymer material colorant which has excellent coloring performance, saves energy, is dust-free and pollution-free, and is widely used for coloring plastics, building profiles and agricultural pipes. However, there will be some problems in the process of using the color masterbatch. Below is the Jiuzhi Plastics Network to take a look at the reasons and solutions:
1. In the sunlight, there are strips of pigment strips in the product.
This problem needs to be considered from two aspects: plastic physical and mechanical properties and plastic molding process:
1. The temperature of the injection molding equipment is not well controlled, and the color master cannot be fully mixed with the resin after entering the mixing chamber.
2. The injection molding machine does not add a certain back pressure, and the screw mixing effect is not good.
3. The dispersibility of the color masterbatch is not good or the resin is not plasticized.
The process can be debugged as follows:
1. Increase the temperature of the mixing chamber by the drop port portion
2. Apply a certain back pressure to the injection molding machine.
If it is still not good after the above debugging, it may be the dispersibility or matching problem of the color masterbatch and the resin, and should be solved by contacting the masterbatch manufacturer.
Second, after using a certain color masterbatch, the product appears to be more susceptible to cracking.
This may be due to poor diffusion and miscibility caused by the poor quality of the dispersant or auxiliary agent selected by the manufacturer, which affects the physical and mechanical properties of the product.
Third, according to the proportion on the color master specification, the color is too deep (too shallow)
Although this problem is simple, there are many possibilities, specifically:
1. The color master has not been tried carefully, and the pigment is too little or too much.
2. The measurement is inaccurate when used, and the phenomenon of random measurement by domestic enterprises, especially small and medium-sized enterprises
3, there is a problem with the matching of the color masterbatch and the resin, which may be improper selection of the carrier of the masterbatch, or it may be that the manufacturer randomly changes the resin variety.
4, the machine temperature is not appropriate, the color master stays in the machine for too long
Processing procedure: First check whether the resin type matches the color masterbatch, whether the metering is accurate, and then adjust the machine temperature or speed. If there is still a problem, contact the masterbatch manufacturer.
Fourth, the same color masterbatch, resin and formula, why the products injected by different injection molding machines have a dark color?
This is often caused by the injection molding machine. Different injection molding machines have different mechanical conditions due to different manufacturing, use time or maintenance conditions, especially the difference in the degree of adhesion between the heating element and the barrel, so that the dispersion state of the color master in the barrel is also different. A phenomenon will appear.
5. After changing the resin of another brand, the same color masterbatch and formula, the color has changed, why?
Different grades of resin will have different density and melt index, so the properties of the resin will be different, and the compatibility with the masterbatch will be different, so that color change occurs. Generally speaking, as long as the density and melt index are not different. Large, then the difference in color will not be too large, you can correct the color by adjusting the amount of color masterbatch.
6. Does the pigment migration phenomenon during the storage process affect the quality of the product?
Some color masterbats have a high pigment content (or dye), and in this case, migration is normal. Especially the color masterbatch with dye added, serious migration will occur. However, this does not affect the quality of the product, because after the color master is injected into the product, the pigment is in a normal color development concentration in the product.
7. Why are some injection products not shiny?
There are several possibilities:
1. The nozzle temperature of the injection molding machine is too low
2. The mold finish of the injection molding machine is not good.
3, the product molding cycle is too long
4, too much titanium dioxide contained in the masterbatch
5, the color masterbatch is not well dispersed
Eight, after a period of time, some plastic products will fade.
The basic pigment used by the manufacturer is of poor quality and drifts.
9. Why is ABS color master particularly prone to color differences?
Different brands of ABS produced by different countries have large color difference. Even if the same brand of ABS, each batch number may exist. However, this color difference is generally not serious. Users must pay attention to this feature of ABS when using ABS color masterbatch.
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