Improving pigment dispersing in powder coatings with block copolymer dispersants

F.L. Duivenvoorde; C.F. Nostrum, van; J. Laven; R. Linde, van der

doi:10.1007/BF02733785

Improving pigment dispersing in powder coatings with block copolymer dispersants

F.L. Duivenvoorde, C.F. Nostrum, van, J. Laven, R. Linde, van der

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Abstract

The effect of three block copolymer dispersants with a poly(2-vinylpyridine) anchor block and a poly(e-caprolactone) buoy block on the dispersing of TiO2 pigments in a polyester powder coating has been studied with digital image analysis on scanning electron micrographs. The mixing in a lab-scale extruder resulted in a virtually complete break-up of the pigment agglomerates. The average TiO2 particle size was only slightly reduced after further treatment of the TiO2 pigments with any dispersant. However, a significant change in the colloidal stability of the dispersions was observed. Without dispersants, the pigments reagglomerated when heated to 200°C and 235°C. This reagglomeration was completely suppressed by the use of dispersants, as a result of a steric layer around the TiO2 particles.

Original language	English
Pages (from-to)	145-152
Number of pages	8
Journal	Journal of Coatings Technology
Volume	72
Issue number	909
DOIs	https://doi.org/10.1007/BF02733785
Publication status	Published - 2000

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title = "Improving pigment dispersing in powder coatings with block copolymer dispersants",

abstract = "The effect of three block copolymer dispersants with a poly(2-vinylpyridine) anchor block and a poly(e-caprolactone) buoy block on the dispersing of TiO2 pigments in a polyester powder coating has been studied with digital image analysis on scanning electron micrographs. The mixing in a lab-scale extruder resulted in a virtually complete break-up of the pigment agglomerates. The average TiO2 particle size was only slightly reduced after further treatment of the TiO2 pigments with any dispersant. However, a significant change in the colloidal stability of the dispersions was observed. Without dispersants, the pigments reagglomerated when heated to 200°C and 235°C. This reagglomeration was completely suppressed by the use of dispersants, as a result of a steric layer around the TiO2 particles.",

author = "F.L. Duivenvoorde and \{Nostrum, van\}, C.F. and J. Laven and \{Linde, van der\}, R.",

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journal = "Journal of Coatings Technology",

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T1 - Improving pigment dispersing in powder coatings with block copolymer dispersants

AU - Duivenvoorde, F.L.

AU - Nostrum, van, C.F.

AU - Laven, J.

AU - Linde, van der, R.

PY - 2000

Y1 - 2000

N2 - The effect of three block copolymer dispersants with a poly(2-vinylpyridine) anchor block and a poly(e-caprolactone) buoy block on the dispersing of TiO2 pigments in a polyester powder coating has been studied with digital image analysis on scanning electron micrographs. The mixing in a lab-scale extruder resulted in a virtually complete break-up of the pigment agglomerates. The average TiO2 particle size was only slightly reduced after further treatment of the TiO2 pigments with any dispersant. However, a significant change in the colloidal stability of the dispersions was observed. Without dispersants, the pigments reagglomerated when heated to 200°C and 235°C. This reagglomeration was completely suppressed by the use of dispersants, as a result of a steric layer around the TiO2 particles.

AB - The effect of three block copolymer dispersants with a poly(2-vinylpyridine) anchor block and a poly(e-caprolactone) buoy block on the dispersing of TiO2 pigments in a polyester powder coating has been studied with digital image analysis on scanning electron micrographs. The mixing in a lab-scale extruder resulted in a virtually complete break-up of the pigment agglomerates. The average TiO2 particle size was only slightly reduced after further treatment of the TiO2 pigments with any dispersant. However, a significant change in the colloidal stability of the dispersions was observed. Without dispersants, the pigments reagglomerated when heated to 200°C and 235°C. This reagglomeration was completely suppressed by the use of dispersants, as a result of a steric layer around the TiO2 particles.

U2 - 10.1007/BF02733785

DO - 10.1007/BF02733785

M3 - Article

SN - 0361-8773

VL - 72

SP - 145

EP - 152

JO - Journal of Coatings Technology

JF - Journal of Coatings Technology

IS - 909

ER -

Improving pigment dispersing in powder coatings with block copolymer dispersants

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