1.3 The dispersion of the masterbatch is not good or the plasticization of the resin is not good. Special masterbatch is used for coloring, and the pigment of the universal masterbatch will show different colors in different plastics, so the predictability of the coloring effect is poor.

Introduction

The Baiyoucai plastic coloring system is a plastic and plastic product coloring system, which is based on the Pantone standard and is summarized from the actual production experience of many Zhejiang businessmen over the years. Although Chinese manufacturers gradually tend to use masterbatches, due to the late start of China's plastic products, the quality is uneven. As a result, many manufacturers often have problems such as uneven coloring and low weather resistance, which seriously increases the product scrap rate and directly leads to an increase in production costs. The Baiyoucai system is a system for the local plastic association to openly deal with product color matching problems, which can basically solve most of the problems arising in the production process of plastic products. Basic composition Injection molding actual color matching system Blow molding actual color matching system Extrusion molding actual color matching system Rotational molding actual color matching system Flow pattern two-color and multi-color color matching system Common problems 1. Under sunlight, there are stripes of pigment bands in the product. This problem needs to be considered from two aspects: the physical and mechanical properties of plastics and the plastic molding process: 1.1 The temperature of the injection molding equipment is not well controlled, and the masterbatch cannot be fully mixed with the resin after entering the mixing chamber. 1.2 The injection molding machine does not add a certain back pressure, and the mixing effect of the screw is not good. 1.3 The dispersion of the masterbatch is not good or the plasticization of the resin is not good. The process can be debugged as follows: 1. Slightly increase the temperature of the mixing chamber near the blanking port 2. Apply a certain back pressure to the injection molding machine. If the above debugging is still not good, it may be a problem of dispersion or matching of the masterbatch and resin, and the masterbatch manufacturer should be contacted for resolution. 2. After using a certain masterbatch, the product seems to be easier to break. This may be due to the poor diffusion and miscibility caused by the poor quality of the dispersant or additive selected by the manufacturer, which affects the physical and mechanical properties of the product. 3. After using the masterbatch according to the ratio in the masterbatch manual, the color is too dark (too light). Although this problem is simple, there are many possibilities, specifically: 3.1. The masterbatch has not been carefully tested, and the pigment is too little or too much. 3.2. The measurement is inaccurate during use. There are many Chinese companies, especially small and medium-sized enterprises, that measure arbitrarily. 3.3. There is a problem with the matching of the masterbatch and the resin. This may be due to the improper selection of the carrier of the masterbatch, or the manufacturer may change the resin variety at will. 3.4. The machine temperature is improper, and the masterbatch stays in the machine for too long. Processing procedures: First, check whether the resin variety matches the masterbatch and whether the measurement is accurate. Secondly, adjust the machine temperature or speed. If there is still a problem, contact the masterbatch manufacturer. 4. Why do the products injected by different injection molding machines have different colors for the same masterbatch, resin and formula? This is often caused by the injection molding machine. Different injection molding machines have different mechanical states due to different manufacturing, use time or maintenance conditions, especially the difference in the closeness between the heating element and the barrel, which makes the dispersion state of the masterbatch in the barrel different, and the above phenomenon will occur. 5. After changing to another brand of resin, the color of the same masterbatch and formula has changed. Why is this? Different brands of resins have different densities and melt indexes, so the performance of the resins will be different, and the compatibility with the masterbatch will also be different, resulting in color changes. Generally speaking, as long as the density and melt index are not much different, the color difference will not be too big, and the color can be corrected by adjusting the amount of masterbatch. 6. Will the pigment migration during the storage of the masterbatch affect the quality of the product? Some masterbatch pigment content (or dye) is very high. In this case, migration is normal. Especially for masterbatch with dye added, serious migration will occur. But this does not affect the quality of the product, because after the masterbatch is injected into the product, the pigment is at a normal color concentration in the product. 7. Why do some injected products have poor gloss? There are many 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 masterbatch contains too much titanium dioxide 7.5. The masterbatch is not dispersed well 8. After a period of time, some plastic products will fade. The basic pigments used by the manufacturer are of poor quality and drift occurs. 9. Why is ABS masterbatch particularly prone to color differences? Different brands of ABS produced in various countries have large color differences. Even for the same brand of ABS, each batch may have color differences. Of course, color differences will also occur after coloring with masterbatch. This is caused by the characteristics of ABS, and there is no thorough solution internationally. However, this color difference is generally not serious. Users must pay attention to this characteristic of ABS when using ABS masterbatch. General and special Special masterbatch: It is a masterbatch manufactured based on the type of plastic used for the product specified by the user, using the same plastic as the carrier. For example, PP masterbatch and ABS masterbatch use PP and ABS as carriers respectively. Universal masterbatch: It also uses a certain resin (often PE with a low melting point) as a carrier, but it can be used for coloring other resins except its carrier resin. Universal masterbatch is relatively simple and convenient, but it has many disadvantages. It is recommended that you use special masterbatch. Why do many companies not produce universal masterbatch? Most regular masterbatch companies in the world generally do not produce universal masterbatch. Universal masterbatch has many disadvantages. In fact, the "universal" range of universal masterbatch is very narrow, and the technical indicators and economic benefits are also poor, which are specifically manifested in: 1. The predictability of coloring effect is poor. Masterbatch is used for coloring. The pigment of universal masterbatch will show different colors in different plastics, so the predictability of coloring effect is poor. 2. It affects other properties of plastic products, especially the strength. The product is easy to deform and twist, which is more obvious for engineering plastics. 3. The cost is relatively high. In order to be "universal", universal masterbatch often uses pigments with higher heat resistance grades, which causes waste. In addition to coloring, can masterbatch also have flame retardant, brightening, antistatic, antioxidant, anti-ultraviolet and other functions? Masterbatch can have some of these functions at the same time, if the factory makes such a request. Sometimes, although the customer has not made any request, the masterbatch company will also suggest users to add some additives according to the needs of the product, such as adding certain additives to the masterbatch, such as brighteners. Of course, this will increase the cost of the product. Heat resistance The heat resistance level of special masterbatch is generally adapted to the plastic used for the product, and it can be used with confidence at normal temperature. However, it will cause different degrees of discoloration in the following cases. One is that the temperature exceeds the normal range, and the other is that the downtime is too long. What is the difference between granulation coloring and masterbatch coloring? Compared with granulation coloring, masterbatch coloring has the following advantages: 1. Coloring and product processing are completed at one time, avoiding the heating process of granulation coloring on plastics, which is good for protecting the quality of plastic products. 2. It simplifies the production process of plastic products. 3. It can save a lot of electricity. Will the products colored with masterbatch not fade? There is no product that will never fade. Products colored with masterbatch may still fade, but the degree is different for products of different grades. Some are more obvious, and some are difficult to detect.

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