Light fastness of liquid crystal-based thermochromic printing inks

Jakovljević, Maja; Kulčar, Rahela; Friškovec, Mojca; Lozo, Branka; Gunde, Marta Klanjšek

doi:10.1016/j.dyepig.2020.108482

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…A wide range of organic and inorganic compounds in films of metal oxides, such as vanadium oxide, show the characteristics of thermochromism. These chromic materials are applied in two ways: [23][24] • By using the leucodyes • By using liquid crystal substances called cholesteric or chiral nematic systems. In this system the molecules form helices.…”

Section: Thermochromic Techniquementioning

confidence: 99%

Camouflage Fabric – Fabric for Today’s Competitive Era

Regar

Amjad²,

Singhal³

2020

TLR

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Innovation is the foremost requirement of today’s competitive era. Innovation refers to improving on an existing concept or idea using a stepwise process to create a commercially viable product. Food, clothing, and shelter are the basic needs of a human being. Clothing is made from textiles; with the help of textiles, the shelters are made more comfortable and attractive. Traditionally, fabrics are used for apparel and home furnishing purpose, but these days, application is diversifying in order to satisfy technical and protective functions. Camouflage fabrics are the ones most suitable for technical and protective purposes. Over the past few years, researchers have put emphasis on the development of camouflage fabrics for security measures for troops, and for activities intended to hide facts and mislead the enemy. Years of investigations have been invested into innovation in the manufacture of these fabrics which are providing the ultimate performance and reliability. In this review paper, an attempt is made to comprise principle, manufacturing techniques, properties and application. This paper also highlights the modern development and recent trends in the field of camouflage fabric. Camouflage and multispectral universal camouflage are the main areas of recent trends on camouflage fabrics. Camouflage fabrics are mostly used for hunting, survival prepper, tactical and military protective wears.

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Section: Thermochromic Techniquementioning

confidence: 99%

Camouflage Fabric – Fabric for Today’s Competitive Era

Regar

Amjad²,

Singhal³

2020

TLR

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“…In addition to their functionality and attractiveness, these inks also have some drawbacks that are mainly related to their poor stability to various chemicals and light [ 3 , 4 ]. Their poor stability when exposed to UV radiation limits the time of exposure of products to external conditions and limits their applications [ 4 , 5 , 6 ]. The polymer envelope is much more stable than the mere polymer binder of thermochromic ink [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Improvement in Thermochromic Offset Print UV Stability by Applying PCL Nanocomposite Coatings

et al. 2022

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Thermochromic (TC) printing inks change their colouration as a response to a change in temperature. This ability renders them attractive for various applications such as smart packaging, security printing, and marketing, but their application is limited due to their low UV stability, i.e., loss of their thermochromic effect when exposed to UV radiation. In order to improve the UV stability of TC prints, one offset TC printing ink was printed and coated with nanomodified polycaprolactone (PCL) coating. The coating was prepared with the incorporation of 1%, 2%, and 3% mass ratios of ZnO and TiO2 nanoparticles in the PCL matrix. The prepared nanocomposite coatings were applied onto the TC print and exposed to UV radiation; afterwards, they were characterized by the colour properties of prints, SEM microscopy, FTIR, and fluorescence spectroscopy. SEM microscopy, FTIR, and fluorescence spectroscopy showed higher rates of polymer degradation, and the results of colour stability indicated that 3% TiO2 in PCL matrix gave the best UV stability and protection of TC prints.

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“…20 Due to the activity of leuco dye to energy, thermochromic microcapsules are showing a poor heat and light stability. [21][22][23] For example, thermochromic microcapsules and their product lost thermochromism property when thermochromic microcapsules are exposed to sunlight even for a very short time, which greatly limits their outdoor application. 24,25 In recent decades, some reports on the stability of thermochromic materials have been carried out.…”

Section: Introductionmentioning

confidence: 99%

“…Thermochromic mechanism of those microcapsules is shown in Scheme 1, it is the competition reactions of bisphenol A and fluorane dye or solvent 20 . Due to the activity of leuco dye to energy, thermochromic microcapsules are showing a poor heat and light stability 21–23 . For example, thermochromic microcapsules and their product lost thermochromism property when thermochromic microcapsules are exposed to sunlight even for a very short time, which greatly limits their outdoor application 24,25 .…”

Section: Introductionmentioning

confidence: 99%

High sunlight resistant thermochromic smart textiles based on UV absorbing polymer

Zhong

et al. 2022

J of Applied Polymer Sci

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In this study, a new UV absorptive copolymer was prepared and further applied in thermochromic smart textiles in order to improve its application property. Firstly, UV absorptive copolymer was prepared by solution polymerization using a structural monomer (methyl methacrylate, MMA) and a UV absorptive functional monomer (2‐[3‐(2H‐benzotriazol‐2‐yl)‐4‐hydroxyphenyl] ethyl methacrylate, BHEM), which absorbs UV light effectively and has strong absorption at 230, 305, and 340 nm. And then, a light‐resistant thermochromic fabric with a three‐layer structure was prepared via coating technology. The influencing factors on light‐resistant thermochromic fabrics were systematically investigated by controlling polymerization components and copolymer dosage. The fading rate of the optimized light‐resistant thermochromic fabric after 10 h illumination is only 27.9%, which is 60.9% improvement than thermochromic fabric without a protective copolymer. Light‐resistant thermochromic fabrics with a 36 μm UV absorbing polymer coating shows excellent color fastness, including wash fastness (five grades), wet rubbing fastness (five grades), and light fastness (two grades). Moreover, light‐resistant thermochromic fabrics have good color reversibility and fatigue resistance (100 cycles) properties. And this approach provides a feasible optimization scheme for improving the light resistance of thermochromic textiles.

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Light fastness of liquid crystal-based thermochromic printing inks

Cited by 12 publications

References 29 publications

Camouflage Fabric – Fabric for Today’s Competitive Era

Camouflage Fabric – Fabric for Today’s Competitive Era

Improvement in Thermochromic Offset Print UV Stability by Applying PCL Nanocomposite Coatings

High sunlight resistant thermochromic smart textiles based on UV absorbing polymer

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