The white masterbatches we produce are designed and manufactured with the highest quality pigments based on PE, PP, and ABS polymers. The best dispersion and high quality are specifications of this masterbatch. This masterbatch can improve mechanical properties as well. white masterbatch is used for a wide range of applications; such as Films, Household appliances, Injection parts, and blow molding parts.
Titanium dioxide (Ti02) is the most important white pigment used in the plastics industry. It has a higher refractive index than any other white pigment and has good chemical stability. It is also non-hazardous and possesses very good dispersibility and good thermal stability. There are two commercially useful forms: rutile and anatase. Rutile has higher opacity and is considerably less photocatalytically active than anatase. It also has a slightly higher refractive index (2.70 as against 2.55), giving better light-scattering power. Rutile-type Ti02 also accepts surface treatments more readily, bonding better than anatase. Anatase is used mainly in paper and elastomers: in thermosetting resin systems, it retards gel time and may prevent cure altogether. The pigment is extracted from crude ore, removing impurities such as iron oxide.
Titanium dioxide grades
A typical range of grades includes:
- Stabilized, surface-treated micronized rutile, chloride process. This gives the highest weather stability in resin systems, especially PVC and polyolefins; with good dispersibility, brightness, and tinting strength.
- Stabilized, surface-treated micronized rutile. This has good weather stability and very good dispersibility, especially in PVC.
- Stabilized, surface-treated micronized rutile. This has very good photochemical stability and dispersibility in aqueous systems; good for urea and melamine molding compounds and rigid PVC.
- Surface-treated micronized rutile. This gives brilliant shades in color compounds, high tinting strength, and good dispersibility; good economic value; weather stability limited in PVC with lead stabilizers.
- Surface-treated micronized anatase. This has high tinting strength, a bluish color tone, outstanding brightness, and dispersibility. It is less abrasive than rutile pigments, but not recommended for outdoor applications.
- Untreated micronized anatase. This has very good brightness, bluish color tone, high tinting strength, and good dispersibility in aqueous systems.
Opacity and tinting strength
Key criteria for all pigments (and particularly whites) are opacity and tinting strength. Opacity is particularly important in thin-section applications, where a highly opaque pigment can serve well, even at a lower concentration. In thicker sections, it may be less important – but it is as well to remember the other side of the coin: lower concentrations of Ti02 pigment may detract from durability.
Tinting strength measures how well a given amount of pigment affects the overall coloring of the molded product. With Ti02 this means how well it lightens a colored compound, or adds whiteness and brightness to a white system. This is important not only in white compounds but also in compounds where the coloring influence of other additives must be masked. With titanium dioxide, the development of opacity and tinting strength depends on light-scattering power, which is governed by refractive index, particle size distribution, Ti02 content, and dispersion in the polymer.
The greater the difference between the refractive index of the pigment and its surrounding medium, the higher the light-scattering power, and therefore the opacity and tinting strength. Control of particle size distribution is critical if the maximum opacity potential of Ti02 is to be realized. For the most efficient light scattering, the particle diameter should be about 50% of the wavelength of the Ught to be scattered. So, some grades of Ti02 pigments are produced to maximize the number of particles in the range 0.20-0.40 jam, which is approximately half the 400-700 nm range of the visible light spectrum.
The effect on properties of particle size distribution of titanium dioxide is:
- 0.2-0.4 μm: particles develop opacity
- 0.4-1.0 μm: particles affect durability
The actual Ti02 content of a pigment is an important factor in the opacity developed by a specific pigment. Typical grades have a content of 8 8-9 7%. Good dispersion is also a key criterion in developing high opacity and tinting strength. Maximum values will be developed only if the number of aggregates and agglomerates is few (and those that are present are well distributed throughout the polymer matrix).
Pure titanium dioxide scatters all wavelengths of visible light uniformly and therefore appears as brilliant white in a colorless plastic. Pigment color is essentially dependent on purity, so maximizing the potential for producing a brilliant white.
DanPolymer’s white masterbatch
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Buy white masterbatch
If you would like to buy white masterbatch, you can call 02158381200 for consultation and get the daily price of white masterbatch.