Fifth, the precautions for using color masterbatch: Weihai Jocund Home Textile Co., Ltd , https://www.jocundhome.com
1. How to use color masterbatch? The use of the color masterbatch is very simple, it is only necessary to mix with the resin particles according to the prescribed ratio, and it can be mixed by hand. Pay attention to the following issues during the operation of the device:
1.1. The mixing chamber of the injection molding machine or extruder generally has multiple temperature zones, and the temperature near the blanking port should be slightly higher. This is to make the color master melt quickly after entering the mixing chamber, as soon as possible with the plastic resin. Mixing evenly, which is beneficial to the color masterbatch in a well dispersed state in the product.
1.2. Appropriate application of back pressure to the injection molding machine can improve the mixing effect of the screw and facilitate the dispersion of the pigment. The side effect of applying the back pressure is to slow down the injection speed.
1.3. Increasing the temperature of the die of the extruder can increase the brightness of the product.
2. How to determine the proportion of color masterbatch used? The basis for determining the use ratio of the masterbatch is to obtain a satisfactory coloring effect. As long as the surface of the product is uniform in color and there are no streaks and spots, it can be recognized. The use ratio of the seven-color deer color masterbatch can be selected as follows: 1:100 Unless the mixing property of the equipment is very good, the uneven dispersion of the pigment is likely to occur, and the seven-color deer company generally does not recommend the customer to use this ratio. However, some customers are particularly eager to use this proportion of color masterbatch due to price pressure. Seven-color deer company is also thinking about customers, and it also produces such a low proportion of concentrated color masterbatch, and the dispersibility of pigments can generally meet the requirements. 1:50 is used for coloring general plastic products. PE and PP color masterbatch are used in a ratio of 1:33--1:25 for PO products with higher coloring requirements, lower coloring requirements or general ABS. Products 1:20 for advanced plastic products, including PO, ABS, can be widely used in injection molding, blow molding, spinning and other processes. 1:20 or more are generally used for coloring high-grade cosmetic containers, and more for small injection molding machines. How to calculate the cost of using color masterbatch? The weight of the color master itself should be deducted when calculating the cost of coloring the master. For example: 2 kg of color masterbatch is added to 100 kg of plastic resin. At this time, the total weight is 102 kg. Assuming the resin price is 10 yuan/kg, the color masterbatch price is 20 yuan/kg, and the color of the 102 kg plastic product is used. The cost of the mother is: 2 kg × (20 yuan / kg -10 yuan / kg) = 20 yuan converted into 100 kg of plastic products, the cost of using color masterbatch is: 20 yuan / 102 kg × 100 kg = 19.61 yuan 4. Will the use of color masterbatch increase product cost? This is the case in most cases. In some cases, however, coloring with color masterbatch is more economical than coloring with toner, because colorists can achieve higher color pigment coloring through a combination of several lower-priced pigments. Also consider the following two phenomena:
4.1. In many cases, the choice of pigments used by plastics manufacturers in color matching is not the most economical. Because of the lack of familiarity with pigments, it is very common to repeatedly test the color and cause manpower and material waste. This problem does not exist with the color master.
4.2. The products colored with color masterbatch and the products colored with toner are completely different in grade, and the price is also higher than the price. The higher the selling price is higher than the cost increased by using the color masterbatch, so the color The mother can create "profit" instead. From this perspective, in some cases, coloring with color masterbatch is more economical than coloring with toner.
5. Does the color master need to be dried before use? Color masters do not need to be dried under normal conditions and can be used directly. However, except for ABS and NY color masterbatch, they should be dried according to the conventional process. How long is the color master's shelf life? Color masterbatch can be stored for a long time. The pigment in the color master is dispersed and fixed in the carrier resin, and is in a closed state, and the quality does not change even if it is stored for a long period of time. However, it should be stored in a dry, cool environment. 6. Can you use several different color masterbatches to prepare colors? The company often uses several color masterbatches to prepare specific colors for small-volume customers. However, without the guidance of the company's technical staff, customers can't make their own use of several color masterbatches, and they can't mix the color masterbatch produced by different companies. In order to avoid incompatibility and loss. Does the use of color masterbatch affect other properties of the product? Some pigments have an effect on the flame retardant effect of the product. When used in flame retardant products, it should be pointed out to the masterbatch manufacturer. Does the mold have any effect on the use of the masterbatch? In order to fully display the coloring effect of the masterbatch, the mold must have a corresponding quality, especially the surface must be very smooth.
6. Common defects of color masterbatch 1. Under the sunlight, the stripe-like pigment strip in the product needs to be considered from the aspects of plastic physical and mechanical properties and plastic molding process:
1.1 The temperature of the injection molding equipment is not well controlled, and the color master cannot be thoroughly mixed with the resin after entering the mixing chamber.
1.2 The injection molding machine does not add a certain back pressure, and the screw mixing effect is not good.
1.3 The dispersibility of the 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.
2. 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.
3. After using the ratio on the color master specification, the color is too dark (too shallow). Although the problem is simple, there are many possibilities, specifically:
3.1. The color masterbone has not been carefully tested, and the pigment is too little or too much. 3.2. The measurement is inaccurate when used. The phenomenon that domestic enterprises, especially small and medium-sized enterprises, are randomly measured. 3.3. There is a problem in the matching of color masterbatch and resin. This may be If the carrier of the color masterbatch is not properly selected, it may be that the manufacturer randomly changes the resin type. 3.4. The temperature of the machine is improper. The color masterbatch stays in the machine for too long. Procedure: First check whether the resin type matches the color masterbatch, whether the measurement is accurate, and then adjust the machine. Temperature or speed, if there is still a problem, please contact the masterbatch manufacturer.
4, the same color masterbatch, resin and formula, why the color of the products injected by different injection molding machines? 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 phenomenon of pigment migration 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:
7.1. The nozzle temperature of the injection molding machine is too low 7.2. The mold finish of the injection molding machine is not good 7.3. The molding cycle of the product is too long 7.4. The titanium dioxide contained in the color masterbatch is too 7.5. The dispersion of the color masterbatch is not good. 8. After a while, 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, there may be chromatic aberration in each batch of batch numbers. Of course, color difference will also occur after coloring. This is due to the characteristics of ABS, and there is no thorough solution in the world. However, this color difference is generally not serious. Users must pay attention to this feature of ABS when using ABS color masterbatch.