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Considering blackness, mechanical properties and cost-effectiveness, a durable black masterbatch formulation needs to consider the following factors:
• Carbon black Particle size and structure
• Surface area
• UV stability/protection
• Good dispersibility and/or ease of masterbatch dilution
• Excellent surface smoothness
• Physical and chemical cleanability
• Polymer compatibility
1. Carbon black Particle size and structure
Particle size is a fundamental property that affects carbon black performance. Smaller particles absorb more visible light, which in turn results in greater blackness. Smaller particles also improve aging resistance and increase electrical conductivity.
On the other hand, small particles increase viscosity. A more highly branched agglomerate structure is relatively easier to disperse, but also results in higher viscosity.
2. Surface area
If carbon black has a higher surface area, it can use lower additions to achieve the required blackness. Finer carbon blacks are generally more expensive, however, they are also added at lower levels. Lower addition levels can offset higher costs, resulting in the most economical solution.
3. UV stability/protection
UV radiation can cause color changes, mechanical degradation and chalking. Carbon black can help protect the polymer by absorbing some UV radiation and dissipating it as heat.
The addition of suitable UV stabilizers can further increase the ageing resistance of the polymer. UV resistance ensures that blackness can be maintained for longer in harsh conditions.
4. Good dispersibility and/or ease of masterbatch dilution
When blending, choose carbon black with good dispersibility. When using masterbatch, ensure good dilutability to achieve uniform pigment dispersion.
5. Excellent surface smoothness
Surface smoothness is closely related to both dispersibility and physical purity. Evenly dispersed pigments exhibit a smooth surface appearance which helps improve the black appearance of polymer products. Using carbon black with very low residues helps prevent surface defects caused by the resulting inclusions.
6. Physical and chemical cleanability
Using the correct amount of carbon black and dispersing it well is completely futile if the carbon black contains a lot of physical impurities. Low levels of impurities are unavoidable in carbon black due to the presence of residues in carbon black. However, residue levels must be controlled to a few ppm. In order to achieve high blackness, make sure that the residual concentration of carbon black is below 20ppm.
7. Polymer compatibility
Always make sure that the carbon black you choose is compatible with your polymer system. Common grades are compatible with all common polymers, but may not provide the high performance in specific applications. Specialty grades provide excellent performance in such applications. Consult the carbon black manufacturer about whether a certain grade is suitable for your formulation.
OUR MASTERBATCH RANGE (Click to Know More details)
* Color masterbatch
* Black masterbatch
* White masterbatch
* Additive masterbatch
* Filler masterbatch
Lotus Mingda Limited is base on China and has over 15 years of experience of masterbatch manufacturing and sales.
We produce and sells a series of color, black and additive masterbatches, all of which have passed FDA , ROHS , ISO9001,and ISO14001 certificates. The quality of our masterbatches has been recognized by customers in various industries.
like agriculture, infra structure, plastic recycling,flexible packaging and etc.
