White masterbatch itself has many properties, such as: bright color, high color strength, good dispersion, high concentration, good whiteness, strong hiding power, migration resistance and heat resistance, white masterbatch is widely used in In many areas, injection molding, blow molding, drawing, casting, extrusion, blown film, foam, sheet, pipe, pumping, hollow, EVA, blowing, sheet, household appliances and other plastic products industry. Below, let us come to the system to understand the characteristics of white masterbatch, so that we can better use white masterbatch.

The high-quality white masterbatch mainly has the following characteristics:

1, whiteness
The whiteness of the white masterbatch is mainly represented by the titanium dioxide in the masterbatch. There are many factors that affect the whiteness of the titanium dioxide, including the size, shape and size distribution of the titanium dioxide particles, the type and content of the impurities, and the lattice of the titanium dioxide particles. Defects. In general, since the chlorination method has high purity of titanium dioxide as a raw material and less impurities in the preparation process, the whiteness of the chlorination titanium dioxide is better than that of the sulfuric acid method. In the actual white mother market, many white masterbatch manufacturers impersonate titanium dioxide by adding equivalent ash content of calcium carbonate, barium sulfate, and zinc sulfide. In fact, the whiteness of these inorganic powders is incomparable with titanium dioxide. of.

2, hiding power
The hiding power is also a very important indicator of white masterbatch. Good hiding power means that the pigment has strong coloring ability, and the desired effect can be obtained with a small amount of additive. The hiding power of the white masterbatch depends on the choice of titanium dioxide. Compared with the processing technology, rutile titanium dioxide has a smaller and tighter unit lattice and a larger refractive index than rutile titanium dioxide, so the hiding power and anti-ultraviolet light performance are obviously better than anatase. For the same type of rutile titanium dioxide white masterbatch, titanium dioxide particle size is small, narrow particle size distribution, good hiding power in the masterbatch is significantly larger than the titanium dioxide particle size distribution, poor performance in the masterbatch it is good. Similarly, the common hiding power of calcium carbonate, barium sulfate, and zinc sulfide is not comparable to titanium dioxide.

3, dispersion
Dispersibility has an important influence on the application of titanium dioxide in plastics. In general, the finer the titanium dioxide particles, the better the dispersion, the higher the strength of the coloring force, and the fine dispersion of white functions when the film needs to be finely printed. The masterbatch's pattern definition, layering, and vividness are better because the microscopic smoothness of the base film is one of the decisive factors in the quality of the printed pattern.

4, moisture content
The moisture content in the white masterbatch also plays an important role in the performance of the masterbatch. Generally, the moisture content should be controlled below 1500ppm, and the strict requirement should be below 600ppm. In the injection molding process, the raw materials are generally dried before production. In the production of thin films, all the customers buy are directly used after being premixed with the carrier. If the moisture content of the masterbatch is high, it will directly lead to film rupture, and there will also be small bubbles on the film, such as “crystal dots” and other defects. The cause of high white masterbatch moisture content from the masterbatch selected raw materials to the process have an impact.

5, smell
Some film manufacturers will smell a strange odor after using white masterbatch, which is absolutely not allowed in milk film and food contact film. This is mainly due to the fact that the titanium dioxide in the masterbatch is organic. During the treatment process, the coating auxiliaries used were selected to be inappropriate or the amount added was too large, or there was a problem with the dispersant used during the production of the masterbatch, and the white masterbatch brand could be replaced.

6, Hue selection
Due to the low reflectivity of the rutile titanium dioxide in the violet region, the rutile titanium dioxide has a “yellowish” color tone, and the “yellowish” color tone will give the colored product a “stale” feeling and will make the fine print image vivid. The decrease in the degree and layering, which is undesirable among many white masterbatch users, but the addition of a trace of fluorescent whitening agent to titanium dioxide absorbs ultraviolet light at a wavelength of 300-400 nm and converts it to a wavelength of 400 - 500nm blue fluorescence, so that the white masterbatch was "blue phase", white masterbatch users in their own needs to consider.

7, liquidity
The fluidity of the white masterbatch can be expressed as the melt index (MI). The low flow value, high numerical value, good fluidity, good processability, low machine torque, and low power consumption. The user selects the white masterbatch. In addition to requiring the masterbatch to have good fluidity, it is also important to note that the masterbatch should be compatible with the carrier resin in its own factory product. The general principle is that the MI of the masterbatch should be higher than that of the carrier resin.

Through the above system description, we have a deep understanding of the white masterbatch, which helps us to use white masterbatch in daily life, and can play its maximum performance.