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Influence of rheology modifiers and coating parameters on the color-changing effects of textile coatings with multi-layered mica pigments
University of Borås, Swedish School of Textiles.
2014 (English)In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 85, no 9, p. 936-948Article in journal (Refereed) Published
Abstract [en]

In order to optimize the color-changing effects of textile knife-coatings containing multi-layered mica pigments (effect pigments; EPs), the properties and structure of the coating formulation/layer during and after application were investigated. Three pigment coating formulations were prepared by first mixing the EP dispersion into a water-based polyurethane binder. Different types of rheology modifiers (RMs), liquid dispersion of sodium polyacrylates (LDPSAP), hydrophobically alkali swellable emulsions (HASEs) and hydrophobically modified ethoxylated polyurethane, were then added to the dispersion. The rheological behavior of the coating formulations was characterized in terms of the shear rate dependence of the viscosity. The formulations were applied onto the same type of textile substrate using a knife-coating technique. The choice of RM as well as variations in gap height and coating speed increased the solids deposit. The increased amount of coating deposits (thicker coating layers) corresponded to more and better dispersed EPs within the coated layer as well as more horizontally oriented platelets as confirmed by scanning electron microscopy. Multi-angle spectrophotometer measurements showed that the CIE L*a*b* color coordinates varied strongly depending on detection angle. The variations of the absolute values of L* and a* were more pronounced between –15° and 15° detection angles, corresponding to angles with the greatest visual color changes. The slowly coated samples with higher solids deposit were measured to be lighter and of higher chroma compared to samples coated at a higher speed. Generally, the color-changing effects were governed by the choice of RM and coating parameters in terms of variations of the amount of coating deposited onto the samples.

Place, publisher, year, edition, pages
Sage Publications , 2014. Vol. 85, no 9, p. 936-948
Keywords [en]
color-changing textiles, structure-properties, special effect pigments, multi-layered mica pigments, textile coatings, coating parameters, rheology modifiers, Textile Technology
National Category
Materials Engineering
Research subject
Textiles and Fashion (General)
Identifiers
URN: urn:nbn:se:hb:diva-3279DOI: 10.1177/0040517514557309Local ID: 2320/14562OAI: oai:DiVA.org:hb-3279DiVA, id: diva2:871397
Note

Sponsorship:

FoU nämnden, Högskolan i Borås

Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2018-04-04Bibliographically approved
In thesis
1. Functional Textile Coatings Containing Flake-shaped Fillers: investigations on selected optical and electrical properties
Open this publication in new window or tab >>Functional Textile Coatings Containing Flake-shaped Fillers: investigations on selected optical and electrical properties
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis investigates the manufacturing and characterisation of functionalised textile coatings containing different types of flake-shaped fillers with angle-dependent colour-changing and electrically conductive properties, respectively. Common benefits of these types of flakes are their high aspect ratio, which offers low filler loading with high functional performance. However, when applied on flexible fabric, their impact on the mechanical properties and durability leads to that a trade-off between, for example, flexural rigidity and functional performance need to be taken into account. Both experimental studies, with different functional approaches, explore how formulation additives e.g. rheology modifiers and cross-linker and knife coating parameters e.g. gap height and speed influence the formulation viscosity, which in turn strongly influences the amount of solids deposited on the fabric, and the functional performance.

Multilayered mica pigments can provide an angle-dependent colour change based on the phenomenon of interference, and has great potential in application within the textile design and product authentication fields. However, optimal conditions for intense colour-changing effects using these types of flake-shaped pigments depend on a plane-parallel orientation to a flat substrate. The pigment orientation is challenged by textile substrates, which have a textured surface due to the cross-sectional shape of the fibre, the yarn composition and fabric construction. In addition, the semi-transparent nature of these types of pigments means that the substrate colour highly influences the colour-changing effects.

Metal flake-shaped fillers for high electrical conductivity applications are particularly advantageous for reliable power and signal transferring interconnections in the field of electronic textiles. As the conductivity depends on the electron transport between the metal flakes, the challenge is to establish and maintain the three-dimensional network of contacting surfaces between flakes. Although the network is held together and adhered to the substrate by an insulating polymer film matrix, it is highly sensitive to dimensional impact upon different

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2018. p. 69
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 87
Keywords
Flakes, fillers, textile coating, properties, multilayered mica, effect pigment, angle-dependent colour change, metals, conductivity, resistance measurements, e-textiles, flexibility, durability
National Category
Engineering and Technology
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-13691 (URN)978-91-88269-90-4 (ISBN)978-91-88269-91-1 (ISBN)
Public defence
2018-04-27, Vestindien C, Textile Fashion Centre, Skaraborgsvägen 3, Borås, 10:00
Opponent
Available from: 2018-04-04 Created: 2018-02-19 Last updated: 2018-04-10Bibliographically approved

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