Novel heat resistant aqueous dispersions containing phthalazinone / Z. Y. Liu in PAINTINDIA, Vol. LVII, N° 5 (05/2007)

[article]  inPAINTINDIA > Vol. LVII, N° 5 (05/2007) . - p. 89-100 Titre : Novel heat resistant aqueous dispersions containing phthalazinone Type de document : texte imprimé Auteurs : Z. Y. Liu, Auteur ; J. Y. Wang, Auteur ; Q. L. Yan, Auteur ; Y. Kou, Auteur ; X. G. Jian, Auteur Année de publication : 2007 Article en page(s) : p. 89-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispersions et suspensions Hydrophilie Polyphthalazinone éther nitrile cétones Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Poly(phthalazinone ether nitrile ketone)s (PPENK) modified with NaOH was studied in order to find a hydrophilic resin applied in heat-resistant waterborne coatings. The properties ofhydrolyzates, HPPENKa (0.5 h), HPPENKb (1.5 h) and HPPENKc (3.5 h), were measured by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), contact angle (water) and solubility. The structures ofhydrolyzates were confirmed by FT IR and 1H-NMR. The results indicated that the nitrile groups conversion ratio and Ts of hydrolyzates increased whereas the weight loss ratio of HPPENK decreased as hydrolysis time was prolonged. As expected, the hydrophilicity of HPPENK was improved greatly, e.g. when CN conversion ratio was 93.82%, the water contact angles was decreased from 75. 3° of PPENK to 54. 4° of HPPENK. By studying the effect of the different reaction co-solvents, reaction temperature and NaOH concentration on hydrolysis, the optimal synthetic technology could be concluded that it is of 6 N NaOH solution and DMAc as cosolvent at 120°C. Aqueous dispersions based on three modified resins were prepared and their storable stability was in the following order: HPPENKc >HPPENKb >HPPENKa. Especially, the HPPENKc dispersion was not found deposition more than 30 days and played good film-forming property. Cured film properties of HPPENKc as follows: pencil rigidity (6 H), thermal impact resistance (300°C, 24 h), adhesion (grade 1). Curing agents were applied in dispersion, such as Hexamethoxymethyl melamine(HMMM), epichlorohydrin (ECH), triethanol amine, glycerol, etc, among them, HMMM and ECH played excellent curing property. The cooperating emulsification of Span and Tween could improve stability of HPPENK dispersion. Note de contenu : - Structural characterization - The effect of reaction time on thermal stability of hydrolyzates - The effect of different alkali concentration on hydrolysis - Co-solvents in hydrolysis - Hydrolysis reaction temperature - The effect of different reaction time on hydrophilicity and solubility of hydrolyzates - Shelf-life - Curing agents - Emulsifier - Heat resistant properties of cured film of HPPENK Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11485 [article]

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Study on novel heat-resistant aqueous dispersion based on modified poly(phthalazinone ether nitrile ketone)s / Z. Y. Liu in SURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS, Vol. 89, B3 (09/2006)  

[article]  inSURFACE COATINGS INTERNATIONAL. PART B : COATINGS TRANSACTIONS > Vol. 89, B3 (09/2006) . - p. 209-214 Titre : Study on novel heat-resistant aqueous dispersion based on modified poly(phthalazinone ether nitrile ketone)s Type de document : texte imprimé Auteurs : Z. Y. Liu, Auteur ; J. Y. Wang, Auteur ; Q. L. Yan, Auteur ; Y. Kou, Auteur ; X. G. Jian, Auteur Année de publication : 2006 Article en page(s) : p. 209-214 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispersions et suspensions Hydrophilie Polyphthalazinone éther nitrile cétones Résistance thermique Revêtements -- Propriétés thermiques Revêtements en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : Poly(phthalazione ether nitrile ketone)s (PPENK), modified with NaOH, were studied in order to find a hydrophilic resin with could be used in heat-resistant water-borne coatings. The properties of hydrolysates — HPPENKa (0.5 hours), HPPENKb (1.5 hours) and HPPENKc (3.5 hours) — were measured by differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA), contract angle (water) and solubility. The structures of the hydrolysates were confirmed by FIIR (Fourier transform infrared spectroscopy) and1H-NMR. The results indicated that the conversion ration of the nitrile groups and the glass transition temperature (79) of the hydrolysates increased, whereas the weight loss ratio of HPPENK decreased as the hydrolysis time was prolonged As expected, the hydrophificity of HPPENK improved greatly (eg when the CN conversion ratio was 93.82%, and the water contact angles decreased from 75.3° for PPENK to 54.4° for HPPENK). By studying the effects of the different reactions of the co-solvents, the reaction temperature and the NaOH concentration on the hydrolysis, it could be concluded that the optimal synthetic technology was of a 6M NaOH solution with DMAc (N,N-dimethylacetamide) as co-solvent at 120°C. Aqueous dispersions based on three modified resins were prepared and their storage stability was as follows: HPPENKc >HPPENKb>HPPENKa. In particular, the HPPENKc dispersion had no settling for more than 30 days and provided good film-forming. The cured film properties of HPPENKc were as follows: pencil rigidity (six hours), thermal impact resistance (300°C, 24 hours), and adhesion (grade 1). Curing agents were applied to the dispersion, such as hexamethoxymethyl melamine (HMMM), epichlorohydrin (ECH), triethanolamine, and glycerol, etc. HMMM and ECH provided excellent curing properties. The co-operating emulsification of (Span) sorbate and (Tween) polyoxyethylene sorbate could improve the stability of the HPPENK dispersion. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - RESULTS AND DISCUSSION : Structural characterisation - The effect of reaction time on the thermal stability of hydrolysates - The effect of different alkali concentration on hydrolysis - Co-solvents in hydrolysis - Hydrolysis reaction temperature - The effect of different reaction times on hydrophilicity and solubility of hydrolysates - Shelf-life - Curing agents - Emulsifier - Heat-resistant properties of cured film of HPPENK - Table 1 : FT IR assignments of chemical groups of the hydrolysates - Table 2 : The thermal stability of PPENK and HPPENK - Table 3 : Solubility of PPENK and HPPENK (at room temperature) - Table 4 : Effect of curing agents on HPPENKc film property - Table 5 : Heat-resistant properties of cured film of HPPENK DOI : 10.1007/BF02699662 En ligne : https://link.springer.com/content/pdf/10.1007/BF02699662.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5279 [article]

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