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The weathering resistance of calcium carbonates compared to kaolins in deep shade emulsion paints

The weathering resistance of calcium carbonates compared to kaolins in deep shade emulsion paints 6 PIGMENT AND RESIN TECHNOLOGY JULY 1978 The weathering resistance of calcium carbonates compared to kaolins in deep shade emulsion paints Submitted by Plüss-Staufer, Switzerland. U.K. agents: Croxton and Garry, Windsor House, Esher, Surrey. The selection of the right extender is very The coated panels were stored for 4 weeks at 20°C important when formulating emulsion paints in and 65% relative humidity before exposure to deep shades, as the effect of some extenders on natural weathering. The weathering site was in the tinting strength and the colour fastness is con­ central Switzerland and had an average rainfall, an siderable. In the following note results on the atmosphere with slight industrial pollution and a investigation of weathering resistance of emulsion height about 400 m above sea level. The panels paints containing calcium carbonates as compared were weathered facing south and inclined at an to those containing kaolins are reported. angle of 45°. Basic formulation 190.0 wt parts water Evaluation after weathering for one year 4.0 wt parts Calgon N, 10% After weathering for one year only the panels 18.0 w t parts sodium pentachlorphenol of paints containing Durcal 10, Durcal 5 and 2.0 wt parts 25% ammonia Omyalite 90 showed films free from cracks and 335.0 wt parts Mowilith DM 4, about 53% with the smallest change in colour. 295.0 wt parts extender (d = 2.7) Clear cracking and marked change in colour 39.0 w t parts permanent carmine FBB-Colanyl, were found with all the kaolins. The film of paint 50% containing kaolin C had already begun to flake off 83.0 w t parts Tylose MH 2000, 2 % in large areas. 28.0 w t parts Preventol CMK, 10% in toluene Chalking (measured by the Kempf method, DIN 6.0 wt parts Preventol 115,1:3 in water 53,159) extender chalking in % 1000.0 w t parts Durcal 5 less than 6 pigment : emulsion = 0.94 : 1 Durcal 10 less than 6 pigment: binder solids = 1.78 : 1 Omyalite 90 Less than 6 The PVC in all experiments was 41 % kaolin A 17 kaolin B 17 The extenders examined were: kaolin C 54 Durcal 5 (*) dry milled crystalline calcium carbo­ nate with a mean particle diameter of 5µm Conclusions Durcal 10 (*) dry milled crystalline calcium carbo­ This study showed again how important is nate with a mean particle diameter of 10µm the selection of extenders in the pigmentation of Omyalite 90 wet processed whiting with a mean emulsion paints. In deep shades of emulsion paints particle diameter of 0.7 µm intended for external use, where not only good Kaolin A natural kaolin with a mean particle dia­ weathering resistance but also colour retention are meter of 2 µm required, Durcal 10 has proved valuable, this being Kaolin B natural kaolin with a mean particle dia­ a calcite extender with a mean particle diameter meter of 0.7 µm of 10µm and a closely controlled particle size range. Kaolin C natural kaolin with a mean particle dia­ After weathering for one year, paints with meter of 0.9 µm Durcal 10 showed that best colour fastness as well (*) Omya D 5 respectively Omya D 10 in the U.K. as an absence of cracking and chalking. On the Production of the weathering panels other hand all the kaolins tested showed poor weathering resistance. Even Omyalite 90 behaved The emulsion paints were adjusted to brush­ better although this ultrafine whiting is not recom­ ing viscosity with water and applied to wood panels mended for external use in paints. 130 x 300 mm in size using a brush (three coats). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Pigment & Resin Technology Emerald Publishing

The weathering resistance of calcium carbonates compared to kaolins in deep shade emulsion paints

PlssStaufer,
Pigment & Resin Technology , Volume 7 (7): 1 – Jul 1, 1978
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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0369-9420
DOI
10.1108/eb041399
Publisher site
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Abstract

6 PIGMENT AND RESIN TECHNOLOGY JULY 1978 The weathering resistance of calcium carbonates compared to kaolins in deep shade emulsion paints Submitted by Plüss-Staufer, Switzerland. U.K. agents: Croxton and Garry, Windsor House, Esher, Surrey. The selection of the right extender is very The coated panels were stored for 4 weeks at 20°C important when formulating emulsion paints in and 65% relative humidity before exposure to deep shades, as the effect of some extenders on natural weathering. The weathering site was in the tinting strength and the colour fastness is con­ central Switzerland and had an average rainfall, an siderable. In the following note results on the atmosphere with slight industrial pollution and a investigation of weathering resistance of emulsion height about 400 m above sea level. The panels paints containing calcium carbonates as compared were weathered facing south and inclined at an to those containing kaolins are reported. angle of 45°. Basic formulation 190.0 wt parts water Evaluation after weathering for one year 4.0 wt parts Calgon N, 10% After weathering for one year only the panels 18.0 w t parts sodium pentachlorphenol of paints containing Durcal 10, Durcal 5 and 2.0 wt parts 25% ammonia Omyalite 90 showed films free from cracks and 335.0 wt parts Mowilith DM 4, about 53% with the smallest change in colour. 295.0 wt parts extender (d = 2.7) Clear cracking and marked change in colour 39.0 w t parts permanent carmine FBB-Colanyl, were found with all the kaolins. The film of paint 50% containing kaolin C had already begun to flake off 83.0 w t parts Tylose MH 2000, 2 % in large areas. 28.0 w t parts Preventol CMK, 10% in toluene Chalking (measured by the Kempf method, DIN 6.0 wt parts Preventol 115,1:3 in water 53,159) extender chalking in % 1000.0 w t parts Durcal 5 less than 6 pigment : emulsion = 0.94 : 1 Durcal 10 less than 6 pigment: binder solids = 1.78 : 1 Omyalite 90 Less than 6 The PVC in all experiments was 41 % kaolin A 17 kaolin B 17 The extenders examined were: kaolin C 54 Durcal 5 (*) dry milled crystalline calcium carbo­ nate with a mean particle diameter of 5µm Conclusions Durcal 10 (*) dry milled crystalline calcium carbo­ This study showed again how important is nate with a mean particle diameter of 10µm the selection of extenders in the pigmentation of Omyalite 90 wet processed whiting with a mean emulsion paints. In deep shades of emulsion paints particle diameter of 0.7 µm intended for external use, where not only good Kaolin A natural kaolin with a mean particle dia­ weathering resistance but also colour retention are meter of 2 µm required, Durcal 10 has proved valuable, this being Kaolin B natural kaolin with a mean particle dia­ a calcite extender with a mean particle diameter meter of 0.7 µm of 10µm and a closely controlled particle size range. Kaolin C natural kaolin with a mean particle dia­ After weathering for one year, paints with meter of 0.9 µm Durcal 10 showed that best colour fastness as well (*) Omya D 5 respectively Omya D 10 in the U.K. as an absence of cracking and chalking. On the Production of the weathering panels other hand all the kaolins tested showed poor weathering resistance. Even Omyalite 90 behaved The emulsion paints were adjusted to brush­ better although this ultrafine whiting is not recom­ ing viscosity with water and applied to wood panels mended for external use in paints. 130 x 300 mm in size using a brush (three coats).

Journal

Pigment & Resin Technology – Emerald Publishing

Published: Jul 1, 1978

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