White masterbatch is added to the titanium dioxide carrier resin which, in part dispersant to improve the dispersion effect of titanium dioxide in the carrier to obtain a uniform dispersion, high-quality masterbatch, as today's world of high-molecular material aid applications one of the main form.
White masterbatch production process is simple, easy to use and excellent dispersion effect, easy production automation; now widely used in courier bags, milk film, bags of washing powder, toothpaste tubes, protective film, food packaging bags and sheets, injection molding, blow molding and other products.

White masterbatch used in food packaging bags
Plastics factory owner how to choose white masterbatch?
With a "small physique, big energy" to describe very appropriate white masterbatch, white masterbatch is small, but to buy a good product does require attention on many factors.Domestic white masterbatch quality varies greatly, know much friends in the choice of such products are more difficult to start. Listed below are select white masterbatch 9:00 considerations, we want to help:
1. Whiteness higher
Whiteness of white masterbatch Masterbatch mainly by the titanium dioxide to render, and factors affecting the whiteness of titanium dioxide, many of them including the size of the titanium dioxide particles, shape and size distribution, the type and content of impurities and lattice titanium dioxide particles defects. In general, due to the chlorination of titanium dioxide purity higher raw material and less impurities in the manufacturing process, it is better than the chloride process titanium dioxide whiteness sulfuric acid method.
In reality, the white mother marketplace, a lot of white masterbatch manufacturer by adding equal ash content of calcium carbonate, barium sulfate, titanium dioxide, zinc sulfide to impersonate, in fact, these inorganic powder whiteness and titanium dioxide is unparalleled .
2. better hiding
White Masterbatch user requirements is also hiding a very important indicator of good hiding power means that the pigmented strong, with a small amount can be added to achieve the desired effect. White masterbatch hiding power depends on the selection and processing of titanium dioxide, rutile titanium dioxide anatase titanium dioxide compared with smaller and tighter unit cell, and a larger index of refraction, opacity and so UV-resistant performance is significantly better than that of anatase.
For the same type of rutile titanium dioxide white masterbatch, titanium dioxide, small particle size, narrow particle size distribution, dispersion in the masterbatch good hiding power is significantly larger than the particle size distribution of titanium dioxide wide performance in poor dispersion of the masterbatch it is good. Similarly, a common calcium carbonate, barium sulfate, zinc sulfide and titanium dioxide hiding power is not comparable.
substance

Index of refraction

Polyethylene (PE)

1.48

Barium sulfate

1.64

Calcium carbonate

1.68

ZnS

2.37

Titanium Dioxide (A type)

2.55

Titanium Dioxide (R type)

2.75

From the above comparison shows that the refractive index of rutile titanium dioxide with a refractive index difference between the largest carrier PE resin dispersion effect is the best, the strongest coloring that is hiding.
3. The dispersion is better
There dispersion of titanium dioxide used in plastics is an important influence, in general, the finer particles of titanium dioxide, the better the dispersion, the higher the coloring strength, and when the film requires fine print, using the dispersion of fine white mothergrain pattern clarity, layering, vividness better. This is due to the microscopic smoothness of the basement membrane material is one of the determinants of good or bad quality of the printed pattern.
4. The moisture content is lower
Moisture content masterbatch white masterbatch for performance also plays an important impact on the general to control the moisture content 1500ppm or less, demanding to be at 600ppm or less, in the injection molding process, in general, in the production of raw materials will be dried before while in film production, the customer and the carrier are bought after the premix be used directly, if the moisture content of the masterbatch high, will directly lead to a serious rupture, but also the formation of small bubbles in the film, "crystallization point" and other defects, which causes white masterbatch high water has an impact from the selection of raw materials to the masterbatch process.
5. The odor is smaller
Some film makers in the use of white masterbatch, will smell a strange odor, which is absolutely not allowed in milk film and film in contact with food, which is mainly due to the titanium dioxide masterbatch in organic process, the choice of coating additives inappropriate or add excessive or masterbatch production process selected dispersants have a problem, you can replace white masterbatch grades.

White masterbatch

6. Choose Hue
Rutile titanium dioxide since the violet area of ​​the lower reflectivity; therefore, rutile titanium dioxide has a "yellow" color, "yellow" tone will be colored product giving the "old" feel, and make the fine print image bright degrees and layering fall; which in many white masterbatch is unpopular among users.
After adding a trace amount of titanium dioxide among optical brighteners, can absorb ultraviolet wavelength of 300-400nm, 400-500nm wavelength and converted into blue fluorescence, it will give the white masterbatch was "blue phase", White mother users according to their material need to be considered.
7. masterbatch liquidity to a suitable carrier resin
White masterbatch liquidity can be expressed as a melt index (MI), the difference between the value of low flow, high liquidity and good value, good liquidity meant processing performance, low engine torque, power consumption is also low.
Users choose white masterbatch considering liquidity, apart from the requirements of masterbatch has good mobility, but also pay attention masterbatch simply more financial products with its own factory carrier resin to be suitable, the general principle is that the masterbatch MI is higher than the carrier resin.
8. To print better sealing performance
White film products in most cases need to print and sealing, white masterbatch If you add clarity and vividness of calcium carbonate will affect the printing pattern masterbatch added incorrect or excessive dispersants also affect the sealing and printing performance.
9. Light and weather resistance selection
White masterbatch generally require Everbrightness reach 7-8, 4-5 to reach weathering, the temperature should reach 280 degrees. These requirements mainly depends on the quality of titanium dioxide, to achieve the above conditions, it must be to rutile titanium dioxide.
10. Whether by RoHS & FDA
Detection of heavy metals and food contact license is white masterbatch an important indicator, because many white film will be used in food packaging, FDA food certification by a testing must be adopted.

Buy white masterbatch, Masterbatch Limited please Changzhou Hongmei Placke come!