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[article]
Titre : |
Silica-embedded polyurea microspheres with rough surface for matte leather finishing |
Type de document : |
texte imprimé |
Auteurs : |
Liang Jia, Auteur ; Li Wang, Auteur ; Jing Li, Auteur ; Jun Xiang, Auteur ; Yi Chen, Auteur ; Haojun Fan, Auteur |
Année de publication : |
2022 |
Article en page(s) : |
p. 184-194 |
Note générale : |
Bibliogr. |
Langues : |
Américain (ame) |
Catégories : |
Cuirs et peaux -- Finition Microsphères Polymères en émulsion Polyurée Polyuréthanes Rugosité SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
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Index. décimale : |
675 Technologie du cuir et de la fourrure |
Résumé : |
A type of polyurea microspheres with rough surfaces and different sizes (1-12 μm), which was used for waterborne polyurethane matte leather coating, were prepared by precipitation polymerization in H 2 O/acetonitrile system, using isophorone diisocyanate as polymerized monomer, 2,4-diaminobenzenesulfonic acid sodium salt as hydrophilic monomer and nano-SiO 2 as surface roughener. The effect of the loading of isophorone diisocyanate and 2,4-diaminobenzenesulfonic acid sodium salt, the volume ratio of H 2 O/acetonitrile and the addition stage of nano-SiO 2 on the particle size and surface roughness were investigated so as to achieve the excellent matte effect of the coating. The results indicated that the adding of hydrophilic monomer can reduce the particle size of microspheres and improve its re-dispersibility in water, while the increase of the proportion of acetonitrile in the mixed solvent and the loading of polymerized monomer can enlarge the size of the polyurea microspheres. As surface roughener, with the increase of nano-SiO 2 loading, the surface roughness and the particle size of microspheres increase. When nano-SiO 2 is added at the stage of the reaction system getting turbid, the maximum surface roughness of polyurea microspheres can be achieved. Polyurea microspheres with particle size (1-2 μm) and high surface roughness have better matting effect, and the gloss of the prepared waterborne polyurethane coating can be adjusted to less than 1.6° (60°-incident Angle). |
Note de contenu : |
- EXPERIMENTAL : Materials - Preparation of polyurea microspheres with different surface roughness - Preparation of WPU matte coating - Characterization
- RESULTS AND DISCUSSION : Structural of polyurea microspheres - Influence of MPDSA-Na loading on microsphere size and its re-dispersibility - Influence of H2O/AN volume ratio on microsphere size - Influence of IPDI loading on microsphere size - Effect of nano-SiO2 loading on surface roughness of polyurea microspheres
- Influence of nano-SiO2 addition stage on surface roughness of polyurea microspheres - Influence of different polyurea microspheres on the gloss of WPU coating
- Table 1 : Dn and Dn/Dw of polyurea microspheres at different MPDSA-Na loading
- Table 2 : Dn and Dn/Dw of polyurea microspheres at differentH2O/AN
- Table 3 : Dn and Dn/Dw of polyurea microspheres at different IPDI loading
- Table 4 : Dn and Dn/Dw of polyurea microspheres at different nano-SiO2 loading
- Table 5 : The polyurea microspheres with different sizes and size distribution |
DOI : |
https://doi.org/10.34314/jalca.v117i5.4913 |
En ligne : |
https://drive.google.com/file/d/11yBWz4C1N2hxkNkOsI_QcjBpR8gbfic2/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37568 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 5 (05/2022) . - p. 184-194
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