The white masterbatch is the addition of titanium dioxide to the carrier resin, with some dispersant to improve the dispersion effect of titanium dioxide in the carrier to produce uniform dispersion, high quality masterbatch, as the world's polymer additives used in the world's most One of the main forms.
White masterbatch production process is simple, easy to use, decentralized effect is excellent, easy to achieve production automation; currently widely used in courier bags, milk film, detergent bags, toothpaste tube, White Masterbatch protective film, food packaging bags and sheet, And other products.
one. Plastic processing plant owner how to choose white masterbatch?
With "small body, large energy" to describe the white masterbatch and then appropriate, white masterbatch is small, but the purchase of a good product does need to pay attention to many factors. Domestic white masterbatch quality varies greatly, to understand a small number of friends in the choice of such products more difficult to start. The following list of 9 points to choose white masterbatch Note, we hope to help:
1. whiteness is high
The whiteness of the white masterbatch is mainly manifested by the titanium dioxide in the color masterbatch, and there are many factors that affect the whiteness of titanium dioxide, White Masterbatch which mainly include the size, shape and particle size distribution of the titanium dioxide particles, the type and content of impurities, and the titanium dioxide particle lattice Defects. In general, because the chlorination of raw materials on the purity of titanium dioxide is high and the impurities in the preparation process is also less, so chlorinated titanium dioxide whiteness than sulfuric acid method is better.
In the reality of the white mother market, a lot of white masterbatch manufacturers by adding the same amount of ash content of calcium carbonate, barium sulfate, zinc sulfide posing as titanium dioxide, in fact, White Masterbatch these inorganic powder whiteness and titanium dioxide is incomparable The
2. Hiding power is better
Hiding power is also a very important indicator of the requirements of the white masterbatch, the hiding power means that the pigment is highly colored and the desired effect can be obtained with a small addition. The hatching force of the white masterbatch depends on the selection and processing of the titanium dioxide, the rutile titanium dioxide compared to the anatase titanium dioxide, has a smaller and closer unit lattice, White Masterbatch and a greater refractive index, so the hiding power and UV resistance is significantly better than anatase.
For the use of the same type of rutile titanium dioxide white masterbatch, titanium dioxide particle size is small, particle size distribution is narrow, in the masterbatch dispersed good hiding power was significantly higher than the titanium dioxide particle size distribution, poor dispersion in the masterbatch performance it is good. Similarly, White Masterbatch the common calcium carbonate, barium sulfate, zinc sulfide hiding power and titanium dioxide is also incomparable.
3. decentralized better
Dispersibility of titanium dioxide in the application of plastic has an important impact, in general, the more fine titanium particles, the better dispersion, the higher the intensity of the tinting strength, and the need for fine film printing, the use of excellent dispersion of white mother Grain pattern clarity, layering, brightness better. This is because the microscopic smoothness of the basement membrane is one of the determinants of the quality of the printed pattern.
4. Moisture content is low
White masterbatch in the water content of the performance of the masterbatch also plays an important role in the general moisture content to control the following 1500ppm, requiring strict to 600ppm or less, in the injection molding process, the raw materials are generally in the production before drying , And in the film production, the customer is bought and the carrier is premixed directly after use, if the masterbatch moisture content is high, a serious direct lead to rupture of membranes, White Masterbatch there will be small bubbles on the film, "crystal point" And other defects, and cause the white masterbatch high water from the masterbatch selected raw materials to the process have an impact.
5. Odor to be small
Some film manufacturers in the use of white masterbatch, will smell a strange smell, which in the milk film and food contact with the film is absolutely not allowed, mainly due to the masterbatch in the titanium dioxide in organic In the process of treatment, the choice of coating additives is not appropriate or the amount is too large, or masterbatch production process used in the dispersion of a problem, can replace the white masterbatch grades.
6. Hue selection
Rutile Titanium Dioxide has a "yellowish" tone, and the "yellowish" hue will give the painted product a "stale" feel and will make the fine print image bright Degree and level of decline; which in many white masterbatch users which are unpopular.
In the titanium dioxide by adding a trace of fluorescent whitening agent, can absorb the wavelength of 300-400nm ultraviolet light, and converted into a wavelength of 400-500nm blue fluorescence, White Masterbatch so that the white masterbatch was "blue", white mother Grain users in accordance with their own needs to consider.
7. Masterbatch fluidity is suitable for carrier resins
The flowability of the white masterbatch can be expressed as the melt index (MI), the value of low flow is poor, the value is high and the fluidity is good, the flowability is good, the machining performance is good, the machine torque is low and the power consumption is low.
Users choose white masterbatch in the consideration of liquidity, in addition to the requirements of the masterbatch has a good liquidity, but also pay attention to the masterbatch of the melt with their own products in the carrier resin to be suitable, the general principle is the masterbatch MI is higher than the carrier resin.
8. Printing heat sealing performance to be better
White film products in most cases need to be printed and heat sealed, white masterbatch if the addition of calcium carbonate will affect the printing pattern clarity and vividness, the masterbatch added incorrect or excessive dispersant will also affect the heat sealing and Printing performance.
9. Selection of light and weatherability
White masterbatch generally requires light resistance of 7-8, weather resistance of 4-5, temperature to reach 280 degrees. These requirements mainly depends on the quality of titanium dioxide, White Masterbatch to achieve the above conditions, must be to rutile titanium dioxide.
10. Is it through RoHS & FDA?
Heavy metal testing and food contact licensing is also an important indicator of white masterbatch, because many white film will be used in food packaging, FDA food certification is necessary to pass a test.
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