Carbon black is a commonly used filler material and reinforcing agent, widely used in rubber, plastic, paint, printing ink and other fields. The dispersion of carbon black is one of the important factors affecting its performance, poor dispersion will lead to the deterioration of the strength, hardness, wear resistance and other properties of the material. Therefore, how to improve the dispersion of carbon black is an important problem.

ⅠInfluencing factors of carbon black dispersion

1．Carbon black particle size: carbon black with small particle size is easy to disperse, and the larger the particle size, the more difficult to disperse.

2．Surface properties of carbon black: the chemical properties and hydrophilicity of carbon black surface will affect its dispersion, and carbon black with good surface hydrophilicity is easy to disperse.

3．Selection of dispersants: different dispersants have different dispersion effects on carbon black, and the choice of suitable dispersants can improve the dispersion of carbon black.

4．Shear force in the dispersion process: the greater the shear force, the higher the dispersion of carbon black.

5．The choice of solvent: different solvents also have an impact on the dispersion effect of carbon black, and the choice of suitable solvents can improve the dispersion of carbon black.

ⅡMethods to improve the dispersion of carbon black

1．Choose the right dispersant: Choosing the right dispersant is the key to improving the dispersion of carbon black. Commonly used dispersants are surfactants, polymers, colloids and ion exchange resins. Different dispersants have different dispersion effects on carbon black, and the appropriate dispersant should be selected according to the specific situation.

2．Increase the shear force: the greater the shear force, the higher the dispersion of carbon black. The dispersion of carbon black can be improved by using high speed agitator, high shear mixer and other equipment to increase shear force.

3．Choose the right solvent: different solvents also affect the dispersion effect of carbon black, and choose the right solvent to improve the dispersion of carbon black. In general, carbon black has poor hydrophilicity, and solvents with good surface hydrophilicity should be selected for dispersion.

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