Detailed explanation of common problems in the application of Color Masterbatch

According to the classification of carrier resin, it can be divided into polyolefin Color Masterbatch, polyester Color Masterbatch, polyperfluoroethylene propylene Color Masterbatch, general color masterbatch, polyvinyl chloride Color Masterbatch, etc.

According to the color classification, it can be divided into color masterbatch, black masterbatch and White Masterbatch according to the color of color masterbatch.

According to the different functions of high-speed master batch and extruded master batch, the pipes with multi-function, such as color absorption and anti foaming, can be classified according to different functions.

Many users think that the general color masterbatch is easy to use and the dosage is less (1%), so they often take it as the first choice. In terms of the cost of color masterbatch production plant, in order to produce general color masterbatch, pigments with high heat resistance grade and wide application range must be selected. When they are used for resins requiring low temperature resistance such as LDPE, this pigment is too wasteful.

In terms of transportation, storage and use, the proportion of general-purpose color masterbatch is 1:25 and that of general-purpose color masterbatch is 1:100, so 1g of general-purpose color masterbatch can be equal to 4kg of color masterbatch for dog eyes. In addition to saving freight, convenience is also a factor. Some small and medium-sized enterprises receive orders with many resin varieties, and the resin varieties need to be changed continuously in the production process. When the coloring requirements are not very strict, the purchase of general color masterbatch can not only reduce the transportation and inventory, but also facilitate the use.

Considering the coloring effect of users, due to the different degree of "eating color" of different plastics in the coloring process, the coloring effect will be different and sometimes very different in different resins with the same addition amount. In addition, due to the small amount of addition and relatively poor dispersion, patterns, color spots and color spots are easy to appear on the surface of plastic products, and even crispness due to different plastic varieties. In particular, attention should be paid to the products with large area, thin wall and complex shape. At this time, special color masterbatch should be used as much as possible.

In addition, although the universal color masterbatch has wide universality, the incompatibility between its carrier resin and the colored resin can be ignored, but it does not mean that it is safe, and problems will occur if it is careless.

From the analysis of appeal, we believe that considering the coloring effect and product performance, the special color masterbatch is better than the general color masterbatch. It is suggested that when users determine the types of resins they want to color, they should choose the special color masterbatch first.

Because different brands of ABS produced in various countries have large color difference, and even if the ABS of the same brand has color difference between each batch. To this end, the use of Color Masterbatch coloring, of course, there will be color difference. However, this color difference is generally not serious. However, for products with strict requirements, attention should be paid to eliminate the influence caused by the primary color of resin.

Because the reflectivity of titanium dioxide to incident light is less than 100%, especially for the blue and purple spectral ends, the light absorption rate is very high, so it is not pure white, but has a light yellow tone. The complementary color light of blue light and yellow light is added to mix to obtain white. Fluorescent brightener can absorb ultraviolet light (wavelength 300 ~ 400nm) and then emit purple fluorescence (wavelength 420 ~ 480nm), so it can significantly improve whiteness and luster. However, the mechanism of fluorescent brightener is different from that of adding blue. The former lies in "adding light" and the latter in "reducing light". When the light is strong, the reflectivity can greatly exceed 100%. In the past, people believed that the object that can make 100% reflection of incident light should be the whitest. Therefore, after the advent of fluorescent brightener, people obtained the so-called whiter than white. From the perspective of people's visual consciousness, the white with blue tone is whiter than that with yellow tone.

In general, when titanium dioxide is produced, the surface is usually treated with inorganic substances such as aluminum silicon, and often with crystalline water. When it is extruded at high temperature (> 260 ℃), bubbles are formed due to the volatilization of inorganic substances and water vapor on the surface of titanium dioxide particles, resulting in the rupture of the film during coating, stretching and winding, resulting in the formation of bubbles or small holes in the products.

The use of color masterbatch for thin-layer coating to produce coated plastic products, such as instant noodle packaging bags, colored composite plastic textile cloth, paper textile cloth, composite packaging bags and other plastic products, can make the products color evenly, bright color and durable, and the plastic coloring method can be used to replace the ink coloring method, which can greatly reduce the cost, reduce the product thickness and increase the product tightness.

As the color masterbatch is applied to thin-layer products with a minimum thickness of 20um, and the processing temperature is up to 340 ~ 360 ℃, the requirements are different from ordinary masterbatch in the following points.

1. Paint. The fineness must be good, otherwise the coated products will appear color spots, color stripes and other phenomena, and have good heat resistance, and will not change color at the processing temperature. Therefore, the phenomenon of pigment lines is added, and the heat resistance is good. It does not change color at the processing temperature. Therefore, antioxidant matched with pigment is added to improve the heat resistance of color masterbatch.

2. Carrier resin. The peeling strength of coating layer and base material should be considered. The experiment shows that the composite carrier of 1f7b and EVA or 1c7a is ideal.

3. Other additives. In addition to antioxidants, brighteners and anti-aging agents can also be added appropriately to improve weather resistance.

The color masterbatch for communication cable has high requirements for the electrical insulation of various components in the formula, and is particularly sensitive to impurities and ash. According to the special requirements for the electrical performance, production process and use environment of communication cable, the performance of Color Masterbatch shall meet the following requirements: bright color, easy to identify even in dim light; The hue of colored wire core shall comply with iec304 standard; Good migration resistance, no contamination of adjacent core wires; Good heat resistance, no serious fading is allowed at high temperature of 260 ℃; Good solvent and stone resistant ointment performance; It does not affect the electrical, physical, aging and other properties of the core wire; Does not contain heavy metals.

ABS plastic is easy to absorb moisture, and once there is moisture, there will be water spots on the surface of injection molded products. Therefore, during injection molding and other processing, ABS must be dried at 80 ~ 100 ℃ for 4 ~ 8h (according to the actual situation). When the color masterbatch is heated, it often passes through water and contains moisture, so it is more necessary to carry out drying treatment. The drying degree of Color Masterbatch Factory is far from enough. ABS is required to be dried as ABS after mixing with color masterbatch. The drying temperature should be controlled well, because the oven temperature is set too high during drying, which is easy to cause the color masterbatch to melt and stick to the hopper surface, causing trouble. It's better not to set the temperature too high for a long time.

Peeling indicates that two carrier resins with different properties are mixed, and the two resins are not very compatible. It's like injecting the oil-water mixture into a glass bottle. Later, it will be found that the water and oil are still layered. If the user only applies to one kind of plastic raw material, the reason is often caused by what force is added, which makes the carrier in the color masterbatch incompatible with the processing resin. Solution: replace the color masterbatch of the same carrier; The carrier resin in the color masterbatch shall be minimized; The concentration of Color Masterbatch increased; Replace the carrier resin in the color masterbatch and re produce the color masterbatch.

Causes of pattern water spots: water in color masterbatch (or water in user resin); The length diameter ratio of extruder is not enough, or the mixing part is not good enough, resulting in uneven dispersion; The color masterbatch itself is unevenly dispersed; The concentration of selected color masterbatch is too high and the addition amount is too small.

Make decisions according to the above situation.

The main component of white masterbatch is titanium dioxide. Titanium dioxide itself also has an aging period. When used for a period of time, titanium dioxide will slowly age and turn yellow under ultraviolet light and thermal oxidation environment, which is inevitable. Some plastic materials are yellow, such as ABS. Once titanium dioxide is aged, the yellowing degree of ABS products is seriously higher than that of PP and PE products. The whiter the titanium dioxide pigment, the greater the contrast after it turns yellow. Measures can be taken to prevent or reduce such phenomena.

1, choose rutile titanium dioxide, titanium dioxide than anatase titanium dioxide good aging resistance.

2, add antioxidants or UV absorbers to increase the anti aging period of titanium dioxide.