Dispersion stability of titanium dioxide in aqueous isopropanol with polymer dispersant / Wei Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 4 (07/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 4 (07/2020) . - p. 1083-1090 Titre : Dispersion stability of titanium dioxide in aqueous isopropanol with polymer dispersant Type de document : texte imprimé Auteurs : Wei Liu, Auteur ; Geng Yue, Auteur ; Pang Hongjian, Auteur ; Chu Hongying, Auteur Année de publication : 2020 Article en page(s) : p. 1083-1090 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie) Dioxyde de titane Isopropanol L'isopropanol ou alcool isopropylique est le nom commun pour le propan-2-ol, composé chimique sans couleur et inflammable dont la formule chimique est CH3CH(OH)-CH3. C'est l'un des deux isomères du propanol (l'autre étant le propan-1-ol). Il est aussi connu sous son nom abrégé IPA (acronyme de l'anglais IsoPropyl Alcohol). Il est obtenu à partir de la réduction de l'acétone par le tétrahydruroborate de sodium. Un autre procédé de fabrication consiste en une hydratation indirecte du propylène par l'acide sulfurique à 70 %, suivie d'une hydrolyse qui conduit à l'isopropanol. Polyacrylate de sodium Polyesters Potentiel zeta Revêtements en phase aqueuse -- Additifs Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Two polymer dispersants, polyester dispersant (PD) and sodium polyacrylate (NaPAA), were used to disperse titanium dioxide in 10% aqueous isopropyl alcohol (IPA). The effect of pH and zeta potential on the dispersibility of the titanium dioxide (TiO2) was studied via sedimentation. An optimum pH value of 8 for the two polymer dispersants in aqueous IPA suspension was found. The isoelectric point of the TiO2 particles was at pH 5.1 and pH 5.3 and shifted to lower pH in the presence of PD or NaPAA, with a greater decrease in zeta potential for the NaPAA suspension (− 36.5 to − 64.1 mV) due to the high degree of ionization compared with PD (− 36.5 to − 60.6 mV). The conformations of PD and NaPAA were strongly pH dependent: Their adsorption was highest at low pH and lowest at high pH, with the maximum adsorption of PD and NaPAA being 44.0 and 39.2 mg g−1 at pH 3, respectively. It was shown that the stability of the suspensions was not only dependent on the pH but also on the zeta potential and molecular structure of the dispersant. Note de contenu : - EXPERIMENTAL : Materials - Suspension preparation - Sedimentation measurements - Zeta-potential measurements - Adsorption measurements - RESULTS AND DISCUSSION : Effects of pH on suspension - Effects of zeta potential on suspensio - Adsorption isotherms at different pH and conformational structures DOI : https://doi.org/10.1007/s11998-020-00323-6 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00323-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34394 [article]

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Optically variable pigments from dielectric layers and their applications / Wei Liu in COATINGS TECH, Vol. 3, N° 10 (10/2006)  

[article]  inCOATINGS TECH > Vol. 3, N° 10 (10/2006) . - p. 82-86 Titre : Optically variable pigments from dielectric layers and their applications Type de document : texte imprimé Auteurs : Wei Liu, Auteur ; James B. Carroll, Auteur Année de publication : 2006 Article en page(s) : p. 82-86 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Over the last decade, several new pigments made from optical layers of metals and dielectric layers, which fit the general term of optically variable pigments (OVPs), have been commercialized. These pigments generate high chroma and color travel, dramatic changes in color at different angles of illumination, and viewing to produce fascinating color effects in coatings, plastics, and cosmetics. Advances in their development have resulted in high chroma color shifting pigments, with greater utility and impact. This article will focus on dielectric layers for generating optically variable effects, present some basic structure appearance relationships, and cover some examples of application and performance in coatings. En ligne : https://drive.google.com/file/d/1Q0NBGTzj8nxeXblE_c8k09U_3F0nxaTC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5482 [article]

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Synthesis and properties of novel acrylic polyester hyper-dispersant / Wei Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 5 (09/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 5 (09/2016) . - p. 763-768 Titre : Synthesis and properties of novel acrylic polyester hyper-dispersant Type de document : texte imprimé Auteurs : Wei Liu, Auteur ; Liang Cheng, Auteur ; Xinding Yao, Auteur ; Ruina Fang, Auteur ; Guoji Liu, Auteur Année de publication : 2016 Article en page(s) : p. 763-768 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acrylate de 3-pentadécylphényle Acrylate de butyle Agents dispersants (chimie) Composés organiques -- Synthèse Dioxyde de titane Dispersions et suspensions Méthacrylique, Acide L'histoire de l'acide méthacrylique commence en 1865, année où il est synthétisé pour la première fois à partir du méthacrylate d'éthyle. L'acide méthacrylique est très réactif avec les groupes carboxyles, vinyles et esters. Polyacryliques Polymérisation solvants Taille des particules Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : 3-Pentadecylphenyl acrylate (PDPA) was synthesized from renewable sources (the cashew nut shell liquid), by using a novel organic chemical intermediate that can be used to copolymerize with vinyl monomers. A novel acrylic polyester hyper-dispersant was prepared by polymerization of methacrylic acid (MAA), butyl acrylate (BA), and PDPA. The acrylic polyester hyper-dispersants were used to disperse titanium dioxide in non-polar solvent system, and the dispersion performance was studied. The viscosity and particle size of suspensions were affected by monomer ratio and molecular weight; the results showed that the optimum monomer ratio and molecular weight were MAA:BA:PDPA = 1:10:1.2 (wt%) and 6000, respectively. The optimum amount weight of MAA of acrylic polyester should be around 10% (wt%). Note de contenu : - EXPERIMENTAL : Materials - Preparation of acrylic polyester copolyester - Structure analysis - The viscosity and particle size of suspensions - RESULTS AND DISCUSSION : Structure analysis - Effect of molecular weight - Effect of amount of anchor group DOI : 10.1007/s11998-016-9787-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9787-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27113 [article]

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The liquid metal look / Wei Liu in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 197, N° 4510 (03/2007)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 197, N° 4510 (03/2007) . - p. 18-22 Titre : The liquid metal look Type de document : texte imprimé Auteurs : Wei Liu, Auteur ; Carolyn Lavallee, Auteur Année de publication : 2007 Article en page(s) : p. 18-22 Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Oxychlorure de bismuth Photostabilité Pigments métalliques Réflectance Index. décimale : 667.2 Colorants et pigments Résumé : Recent advances mean bismuth oxychloride pigment is being used for variety of purposes. This paper looks at its application in coatings. The liquid metal look is essentially a smooth, highly reflective, non-grainy appearance. This is accomplished by using either a continuous film or by using very thin platelets, on the order of 30-50 nanometers, to reduce the scattering of light from edges of platelets. It has been desirable in the automotive industry for some time and is now making an appearance in other coating applications, such as teletronics. This is accomplished by using either a continuous film or by using very thin platelets of a highly reflective pigment. One of the pigments that satisfy these requirements is bismuth oxychloride. This pigment has been better know for applications such as button and costume jewellery coatings, but recent advances make it feasible for less traditional applications as well, such as achieving the liquid metal effect. Bismuth oxychloride is made by the reaction of bismuth nitrate in acid solution with chloride. By suitably controlling pH and temperature, the formation of BiOCl is thermodynamically preferred over Bi2O3, bismuth oxide. With very fine control of these same parameters the crystals grow as very thin patelets. The chemical reaction is as follows : Bi(NO3)3 + H2O + 3NaCl --> BiOCl + 2HCl + 3NaNO3 The resulting platelets are about 90nm thick at the edge and somewhat thicker in the middle. It is the shape of these platelets, along with the index refraction (about 2.0), that is responsible for its pearlescent appearance. Note de contenu : - Bi(NO3)3 + H20 + 3NaCl -> BiOCl + 2HCl + 3NaNO3 - Optical properties vs effect - UV stability - Applications - Applications in coatings - Blended - Test result - UV absorber - TABLE : 1. Physical properties of BiOCl and TiO2 coated mica - 2. L change for BiOCl crystal stabilised by cerium hydroxide in medium shade after 240hr QUV 340 exposure - 3. L* change for BiOCl crystal stabilised by cerium hydroxide and UV absorber in medium shade after 240hr QUV exposure En ligne : https://drive.google.com/file/d/1bguGWEO5jMB1nJugjzoXYUUtA2H_EmKg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27409 [article]

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UV-curable, special coding inks for optical fibers / Gexing Shen in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 894 (07/1999)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 71, N° 894 (07/1999) . - p. 69-72 Titre : UV-curable, special coding inks for optical fibers Type de document : texte imprimé Auteurs : Gexing Shen, Auteur ; Wanneng She, Auteur ; Xiouning Qu, Auteur ; Xiaomeng Yu, Auteur ; Qunzhen Sun, Auteur ; Wei Liu, Auteur ; Ron Giachen, Auteur Année de publication : 1999 Article en page(s) : p. 69-72 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Codage Encre -- Séchage sous rayonnement ultraviolet Fibres optiques Formulation (Génie chimique) Liants Polyacrylates Réticulation (polymérisation) Revêtements Index. décimale : 667.9 Revêtements et enduits Résumé : A UV-curable, special coding ink for optical fibers consists chiefly of UV-curable prepolymers, coloring materials, and a photoinitiator. The UV-curable prepolymers are silicone epoxy benzoic acrylate (SEBA) and alicyclic hydrocarbon epoxy acrylate (ACEA). The coloring materials are disperse red urethane acrylate (RUA), disperse blue urethane acrylate (BUA), acridine yellow urethane acrylate (YUA), or their mixtures. The relationships of component-property of UV-curable, special coding inks were studied. The typical UV-curable, special coding inks were used to color the optical fibers. Note de contenu : - EXPERIMENTAL : Materials and reagents - Syntheses - Preparation of UV-curable special coding inks - Preparation of cured films - RESULTS AND DISCUSSION : Effect of UV-curable prepolymer compositions on properties - Effect of photocurable dyes on properties - Gel and solvent resistance of UV-curable ink - Adhesion of UV-curable ink to optical fibers - Typical characteristics of UV-curable, special coding inks for optical fibers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17914 [article]

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