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Study on novel heat-resistant aqueous dispersion based on modified poly(phthalazinone ether nitrile ketone)s

Étude sur une nouvelle dispersion aqueuse qui résiste à la chaleur et qui est basée sur poly(phthalazinone éther nitrile cétone)s modifié(s)

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Surface Coatings International Part B: Coatings Transactions

Summaries

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.

Résumé

Des poly(phthalazinone éther nitrile cétone)s (PPENK), modifiés par NaOH on été étdiés afinmde trouver une résine hydrophilique qui soit capable d’étre utilisée dans les revétements hydrodiluables qui résistent à la chaleur. Les propriétés des hydrolysates- HPPENKa (0,5 heures), HPPENKb (1,5 heures), et HPPENKc (3,5 heures)- ont été mesurées grâce à la calorimétrie par analyse différentielle (DSC), la méthode thermogravimétrique (TGA), l’angle de contact (eau) et la solubilité. Les structures des hydrosates ont été confirmées par FTIR (spectrométrie infrarouge par transformée de Fourier) et par spectroscopie 1H-NMR. Les résultats ont indiqué que la proportion de conversion des groupes nitriles aussi bien que la température de latransition vitreuse (Tg) des hydrosates ont augmenté, tandis que la proportion de la perte de poids des HPPENK a diminué avec la prolongation du temps de l’hydrolyse. Comme prévu, l’hydrophilicité des HPPENK abeaucoup amélioré (par exemple quand la proportion de conversion (CN était de 98.82%, et quand les angles de contact (eau) ont diminué de 75.3° pour les HPPENK jusquà 54.4° pour les HPPENK). Grâce à l’étude des effets sur l’hydrolyse des différentes réactions des co-solvants, de la température de la réaction, et de la concentration du NaOH, on a pu conclure que la technoloqie optimale synthétique était celle d’une solution 6M NaOH avec le DMAc (N,N-diméthylacétamide) comme co-solvant à 120°. Des dispersions aqueuses, basées sur trois résines modifiées, ont été préparées et leur stabilité au stockage était HPPENKc>HPPENKb<HPPENKa. En particulier, la dispersion HPPENKc n’avait pas de dépôt de sédiment pendant plus de 30 jours et a fait preuve de la capacité de former un bon film. Pour le HPPENKc les propriétés du film séché étaient dureté de crayon (six heutes), résistance à impact thermique (300°, 24 heures) et adhérence (grade 1). On à appliqué à la dispersion des agents de séchage tels que l’Hexaméthoxyméthylmélamine (HMMM), l’épichlorophydrin (ECH), le triéthanolamine et le glycérol etc, Le HMMM et l’ECH ont donné dexcellentes propriétés de séchage. L’émulsification coopérative de (Span) sorbate et de (Tween) polyoxyéthylène sorbate pourrait améliorer la stabilité de la dispersione de HPPENK.

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Authors and Affiliations

  1. Department of Polymer Science and Materials, Dalian University of Technology, PO 42 Zhongshan Road No 158, 116012, Liaoning Province, People’s Republic of China

    Z. Y. Liu, J. Y. Wang, Q. L. Yan, Y. Kou & X. G. Jian

  2. School of Chemistry & Chemical Engineering, Shihezi University, 832003, Shihezi, People’s Republic of China

    Z. Y. Liu

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  1. Z. Y. Liu
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  2. J. Y. Wang
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  3. Q. L. Yan
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  4. Y. Kou
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  5. X. G. Jian
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Correspondence to X. G. Jian.

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Liu, Z.Y., Wang, J.Y., Yan, Q.L. et al. Study on novel heat-resistant aqueous dispersion based on modified poly(phthalazinone ether nitrile ketone)s. Surface Coatings International Part B: Coatings Transactions 89, 209–214 (2006). https://doi.org/10.1007/BF02699662

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