Product丨CNT enhances black and blue phase solutions
Release time:
2026-04-03
Why is blue toning so important?
In the field of high-end plastic dyeing, "Blue Tone" is a key indicator for measuring the quality of black products. Traditional pigment carbon black often presents a yellow-brown phase, which affects the texture of the product. The multi-walled carbon nanotubes (CNTs) of Shandong Dazhan Nanomaterials Co., Ltd. are becoming a new generation solution for improving the blue phase due to their unique optical properties.
Shandong Dazhan Nanomaterials Co., Ltd. was established in May 2011 and focuses on the research, development, production and application development of carbon nanomaterials. The company has passed IATF16949, ISO9001, ISO14001 and ISO45001 certifications, and its carbon nanotube products have passed EU REACH registration. It is well recognized by the industry and is one of the carbon nanomaterials companies with the greatest growth potential.
Experimental design: two-dimensional verification scheme
This experiment explores GT-400’s blue phase improvement capabilities from two dimensions:
Dimension 1: Add gradient testing separately
- Adding amount: 0.2% → 0.4% → 0.6% → 0.8%.
- Goal: Find the optimal amount of blue phase added.
Dimension 2: Compound test with pigment carbon black
- Fixed carbon black (Cabot M800): 0.5%, 1.5%.
- Superimpose the optimal CNT addition amount.
- Goal: Verify synergy.
Testing standards
ASTM E313, C light source 10° viewing angle, spectrophotometer YS6010.
Core findings: three sets of key data
Add separately: 0.6% is the golden turning point
Added amount L value a value b value hue performance
Conclusion: The b value (yellow-blue axis) reaches the extreme value of -0.59 at 0.6%, showing the best blue phase effect. After exceeding this concentration, the blue color weakens on the contrary, and there is an obvious concentration threshold effect.
Compound carbon black: immediate improvement in blue phase
When there is 0.5% pigment carbon black in the system (basic b value: +0.16, yellowish): the change in b value of CNT addition improves.
Key findings
- 0.6% GT-400 can completely turn the yellow phase of the carbon black system into a blue phase, reducing the b value from +0.16 to -0.33.
- Under the premise that the amount of carbon black remains unchanged, the amount of CNT added is positively correlated with the degree of blue phase.
- GT-400 improves the blue phase in a clear dose-dependent manner.
Application suggestions
Based on this experiment, the following practical suggestions are provided for polyolefin blue phase color matching:
01. Recommended plan
- Optimal addition amount: 0.6%.
- If you pursue the ultimate blue phase: 0.6%.
02. Compound strategy
- When used in combination with pigmented carbon black (such as Cabot M800), the recommended ratio is: carbon black 0.5% + GT-400 0.6%.
- It can achieve an obvious high-end blue texture while maintaining blackness.
Summarize
Shandong Dazhan GT-400 multi-wall carbon tube shows significant blue phase improvement ability in polyolefin systems. The addition of 0.6% can achieve the optimal effect of b value -0.59, and can effectively correct the yellow phase of the pigment carbon yellow. For application scenarios that pursue high-end black texture (such as automotive interiors, electronic casings, and high-end packaging), the compound solution of GT-400 and pigmented carbon black provides a practical path that combines cost-effectiveness and aesthetic performance.
Special recommendation: GD-40 easy-to-process carbon nanotubes
Shandong Dazhan launches GD-40 grade - a "friendly" solution designed for easy processing and high surface quality requirements.
Core advantages
- It is easy to add and produces less dust during the production process, which improves the working environment and reduces the loss of raw materials.
- The product has a good surface and high gloss.
- Dispersion efficiency is improved and batch stability is enhanced.
Recommended dosage
0.4% is the basic recommendation, which can be flexibly adjusted according to the surface conditions of the product.
Processing equipment recommendations
In order to achieve better dispersion effect, it is recommended to use a twin-screw extruder or internal mixer with a high aspect ratio.
This report is based on Haiyi Laboratory data. The formula and process parameters are for reference only. Actual applications need to be adjusted according to specific equipment and materials.
Technical consultation: Haiyi Enterprise Development Co., Ltd.
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