Development of fluorine-free waterborne textile finishing agents for anti-stain and solvent-water separation based on low surface energy (co)polymers

Lacruz, Amado; Salvador, Mireia; Blanco, Miren; Vidal, Karmele; Ilarduya, Antxon Martı́nez de

doi:10.1016/j.porgcoat.2020.105968

Cited by 12 publications

(11 citation statements)

References 45 publications

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“…It is important to point out that WCAs of coated glass slides are much lower than the WCA of WPUD coated fabrics. Thus, the inherent roughness of the textile substrate contributes to achieving high values of WCA [ 18 ]. On the other hand, CAH is an estimator of the degree of imperfection of the surface as the degree of roughness and chemical heterogeneity [ 40 , 41 ], and it can also provide information on solid-liquid adhesion and cohesion forces.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…See Figure 1 for a schematic of a typical multi-layered fabric for outdoor clothing. All of the above-mentioned concerns regarding PFASs in textile sector are leading to intensive research and high market demand of fluorine-free alternatives for DWOR finishing [16][17][18]. On the other hand, providing fabrics with electrical conductivity without affecting the rest of the material's properties is a highly demanded feature.…”

Section: Introductionmentioning

confidence: 99%

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Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Lacruz

Salvador²,

Blanco

et al. 2021

Polymers

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Waterborne polyurethane-urea dispersions (WPUD), which are based on 100% bio-based semi-crystalline polyester polyol and isophorone diisocyanate, have been successfully synthesized and doped with single-walled carbon nanotubes (SWCNT) to obtain a finishing agent that provides textiles with multifunctional properties. The chemical structure of WPUD has been characterized by Fourier-transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The thermal properties have been evaluated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical thermal analysis (DMTA). Mechanical properties have been studied by tensile stress–strain analysis. Moreover, the particle size, particle size distribution (PSD), and stability of developed waterborne dispersions have been assessed by dynamic light scattering (DLS), Z-potential, and accelerated aging tests (analytical centrifugation). Subsequently, selected fabrics have been face-coated by the WPUD using knife coating method and their properties have been assessed by measuring water contact angle (WCA), water column, fabric stiffness, and air permeability. The electrical conductivity of textiles coated with SWCNT-doped WPUD has been evaluated by EN 1149 standard. Finally, the surface morphologies of uncoated and coated fabrics have been studied by scanning electron microscopy (SEM). All of the synthesized polyurethane-ureas provide the coated substrates with remarkable water-repellency and water column, being therefore a more sustainable alternative to waterproof coatings based on fluoropolymers, such as PTFE. The additivation of the polymeric matrices with SWCNT has led to textile coatings with excellent electrical conductivity, maintaining water column properties, giving rise to multifunctional coatings that are highly demanded in protective workwear and technical textiles.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Lacruz

Salvador²,

Blanco

et al. 2021

Polymers

Self Cite

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“…It is important to point out that the WCAs of coated glass slides were much lower than the WCAs of WPUD coated fabrics. Thus, the inherent roughness of the textile substrate contributed to achieving high values of WCA [19]. The OCA values of the coated surfaces were low.…”

Section: Characterization Of Textiles Coated With Wpudmentioning

confidence: 98%

Biobased Waterborne Polyurethane-Ureas Modified with POSS-OH for Fluorine-Free Hydrophobic Textile Coatings

Lacruz

Salvador²,

Blanco

et al. 2021

Polymers

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Waterborne polyurethane-urea dispersions (WPUD), which are based on fully biobased amorphous polyester polyol and isophorone diisocyanate (IPDI), have been successfully synthesized obtaining a finishing agent that provides textiles with an enhanced hydrophobicity and water column. Grafting of trans-cyclohexanediol isobutyl POSS (POSS-OH) to the biobased polymer backbone has also been investigated for the first time and its properties compared to a standard chain extender, 1,3-propanediol (PDO). The chemical structure of WPUD has been characterized by Fourier-transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The thermal properties have been evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Mechanical properties have been studied by tensile stress–strain analysis. Moreover, the particle size, particle size distribution (PSD), and stability of developed waterborne dispersions have been assessed by dynamic light scattering (DLS), Z-potential, storage aging tests, and accelerated aging tests by analytical centrifuge (LUM). Subsequently, selected fabrics have been face-coated by the WPUD using the knife coating method and their properties have been assessed by measuring the water contact angle (WCA), oil contact angle (OCA), water column, fabric stiffness, air permeability, and water vapor resistance (breathability). Finally, the surface morphology and elemental composition of uncoated and coated fabrics have been studied by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), respectively. All of the synthesized polyurethane-ureas provided the coated substrates with a remarkable hydrophobicity and water column, resulting in a more sustainable alternative to waterproof coatings based on fluoropolymers, such as PTFE. Grafting POSS-OH to the polymeric backbone has led to textile coatings with enhanced hydrophobicity, maintaining thermal, mechanical, and water column properties, giving rise to multifunctional coatings that are highly demanded in protective workwear and technical textiles.

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“…Since 1990s, uorocarbon coatings dominated the textile industry due to their unique properties such as repellency to water, oil, stain and soil [10]. Non-PFC coatings are typically acrylates, polyurethanes or mixtures thereof [11,12]. These are cheaper and considered more environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

Coating formulation change leads to inferior bioefficacy of long-lasting insecticidal nets in Papua New Guinea

Bubun

Anetul

Koinari

et al. 2022

Preprint

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Introduction: Long lasting insecticidal nets (LLINs) play a key role in reducing malaria transmission in endemic countries. Previously, we demonstrated a substantial decrease in the bioefficacy of LLINs for malaria prevention delivered to Papua New Guinea (PNG) between 2013 and 2019. This coincided with a rise in malaria cases in the country. The present study was aimed at determining the underlying cause of the observed reduced bioefficacy of these LLINs. In particular, we tested the hypothesis that a change in the coating formulation of the respective LLIN product was the cause for the observed reduction in bioefficacy, and had led to completely altered product properties and performance. Methods A set of PermaNet® 2.0 LLIN samples (n = 12) manufactured between 2007 and 2019 was subjected to combustion ion chromatography in order to understand the chemistry of the LLIN polymer coating formulation. In addition, World Health Organization (WHO) LLIN wash tests and cone bioassays were conducted to further characterize the change in product performance that occurred between 2012 and 2013. Results High polymer fluorine content (3 to 4 g/kg) was measured in PermaNet® 2.0 manufactured up to 2012, whereas nets which were manufactured after 2012 did not contain polymer fluorine indicating a coating formulation change from polyfluorocarbon (PFC) to a non-PFC formulation. The coating formulation change as part of the manufacturing process thus directly resulted in the observed reduction in bioefficacy. In addition, the manufacturing change impacted wash resistance leading to a faster reduction in 24h mosquito mortality in the non-PFC coated product. Conclusion A change in coating formulation of PermaNet® 2.0 resulted in reduced product performance in PNG. Post-2012 PermaNet® 2.0 LLINs should not be considered to be the same product as PermaNet® 2.0 LLINs produced prior to and in 2012. Coating formulation changes should be validated not to impact LLIN product performance.

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Development of fluorine-free waterborne textile finishing agents for anti-stain and solvent-water separation based on low surface energy (co)polymers

Cited by 12 publications

References 45 publications

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Biobased Waterborne Polyurethane-Ureas Modified with POSS-OH for Fluorine-Free Hydrophobic Textile Coatings

Coating formulation change leads to inferior bioefficacy of long-lasting insecticidal nets in Papua New Guinea

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