Syntheses and properties of cationic amine–epoxy adducts and their use in electrodeposition: I. Diethanolamine/diethylamine terminated cationic epoxy with pendant 2‐ethylhexanol‐blocked TDI groups

Yang, Chin‐Ping; Chen, Yahn-Haur

doi:10.1002/app.1991.070420423

Cited by 17 publications

(1 citation statement)

References 5 publications

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“…Effect of the amount of IO on properties of the dispersion resin and stability of the colour paste is given in Table I. Table I shows that water solubility and dispersibility of the resin is good and the stability of the colour paste is also good when the amount of IO is 20 g. This may be caused by the fact that the moderate blocking of TDI leads to the increase of the molecular weight of the dispersion resin (Yang and Chen, 1991;Howard and Wu, 1993). Furthermore, the quaternary ammonium group of a proportion of the dispersion resin is more than two, which is beneficial to water solubility and dispersibility of the dispersion resin.…”

Section: Effect Of Amount Of Io On Properties Of Dispersion Resin and Stability Of The Colour Pastementioning

confidence: 99%

Preparation of pigment dispersion resin and stable colour paste

Chen

Bao

et al. 2015

Pigment &Amp; Resin Technology

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Purpose – The purpose of this research is to prepare a dispersion resin with good dispersity and a colour paste with good stability. At present, the colour paste is being prepared using the pigment dispersion resin which has the group quaternary ammonium. The dispersion resin prepared has good dispersity of pigment and extender. However, the stability of storage and construction of the colour paste is relatively poor, which has a negative influence on the application of cathodic electrodeposited (CED) coatings. However, the detailed investigation on the dispersion resin and the stable colour paste has not been reported. Design/methodology/approach – Three steps are adopted to prepare the dispersion resin, that is blocking toluene diisocyanate (TDI), quaternary ammoniation of blocked TDI and ring opening of epoxy resin. The resultant dispersion is used to prepare the colour paste. The factors, which have an influence on the dispersity of the dispersion resin and stability of the colour paste, are optimised. Findings – The typical recipes of preparing the dispersion resin and the resultant colour paste are obtained. The dispersity of the dispersion resin and stability of the colour paste are good based on the typical recipe. In addition, the film of the CED coating is smooth, dense and hard when the colour paste is used in the CED coating. Practical implications – The dispersion resin can be used to prepare a colour paste, which can be used in the CED coatings. In addition, it also can be applied as a binder of coatings and adhesions. Originality/value – The factors, which have an influence on the dispersity of the dispersion resin and stability of the colour paste, are studied in detail. The typical recipes of preparing the dispersion resin and the resultant colour paste are obtained. Based on the typical recipe, the dispersity of the dispersion resin and stability of the colour paste are good.

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Section: Effect Of Amount Of Io On Properties Of Dispersion Resin and Stability Of The Colour Pastementioning

confidence: 99%

Preparation of pigment dispersion resin and stable colour paste

Chen

Bao

et al. 2015

Pigment &Amp; Resin Technology

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Coemulsion and electrodeposition properties of mixtures of a poly(oxypropylene)‐modified cationic epoxy resin and nonionic crosslinker system

Chen

Yang

1993

Angew. Makromol. Chem.

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The emulsification and electrodeposition properties of mixtures of a poly(oxypropylene) (POP)-modified cationic epoxy resin (111) and nonionic pentaerythritol/toluene diisocyanate/2-ethylhexanol (PETOLTDI-2EH, V) were investigated and the compositions of their electrodeposited films were obtained by Fourier Transform Infrared (FTIR) quantitative analysis to study the effects of soft segments (oxypropylene groups) contained in resins I11 on the coemulsion and electrophoretic behavior.The results indicate that the deposition yield and throwing power of an emulsion of individual I11 are deeply affected by its average molecular weight (AMW). Resin I11 with higher AMW has higher deposition yield but lower throwing power. Moreover, the deposition yield of V/III coemulsion also increases with increasing the AMW of 111. On the other hand, the throwing power of V/III coemulsion is not related to the AMW of I11 but affected by the amount of soft segments in 111. Increasing "soft segment" content in I11 increases the throwing power of coemulsion. Furthermore, at the conditions providing stable coemulsion, the composition of electrodeposited film is almost equal to the resin composition of coemulsion. ZUSAMMENFASSUNG: Die Emulgations-und Elektroabscheidungseigenschaften von Mischungen aus Poly(oxypropy1en)-modifizierten kationischen Epoxidharzen (III) und einem nichtionischen Vernetzersystem aus Pentaerythritol/Toluoldiisocyanat/2-Ethylhexanol-(PETOL/TDI-2EH, V) wurden untersucht. Die Zusammensetzungen von elektrisch abgeschiedenen Filmen dieser Mischungen wurden durch quantitative FTIR-Analyse ermittelt, um die Wirkung der in den Verbindungen I11 enthaltenen weichen Oxypropylen-Segmente auf das Coemulsions-und das Elektrophoreseverhalten zu untersuchen. Die Ergebnisse deuten darauf hin, darj die Abscheidungsausbeute und das Streuvermbgen der Emulsion von reinem I11 stark von dessen mittlerem Molekulargewicht (AMW) beeinflufit werden. Eine Verbindung der Reihe I11 mit hohem AMW zeigt eine hohere Abscheidungsausbeute, aber auch ein geringeres Streuvermogen. Auch die Abscheidungsausbeute von V/III-Coemulsionen steigt mit wachsendem AMW von 111, wogegen das Streuvermogen von V/III-Coemulsionen nicht vom AMW abhangt, jedoch vom Anteil an weichen Oxypropylen-Segmenten in I11 beeinflufit wird. Ein wachsender Anteil an weichen Segmenten in 111 erhoht das Streuvermogen der Coemulsion. Daruber hinaus ist bei den Bedingungen einer stabilen Coemulsion die Zusammensetzung eines elektrisch abgeschiedenen Films annahernd gleich der Zusammensetzung der Coemulsion.

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Synthesis and properties of cationic resins derived from urethane‐modified epoxy resins and methylethanolamine

Yang

Lee

1992

J of Applied Polymer Sci

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SYNOPSISSix urethane-modified cationic resins were synthesized by reacting half-blocked polyglycoltoluene diisocyanate-urethane (half-blocked-PG-TDI-urethane) and 2-ethylhexanolblocked toluene diisocyanate ( 2-EH-blocked-TDI) modified epoxy resins with methylethanolamine and subsequent neutralization with acetic acid. Three different polyglycols were used to react with toluene diisocyanate to form isocyanate-terminated urethanes ( la-c) and subsequently two different monoalcohols were added to react with la-c to give halfblocked-PG-TDI-urethanes (2a-f ). These cationic resins were then dissolved in suitable solvents and mixed with deionized water to form emulsions. The crosslinking properties, emulsion, and electrodeposition properties of these resins were studied in some detail. The deposition yields of emulsions prepared from urethane-modified epoxy resins were higher than those of other emulsions. The pencil hardness of the crosslinked films of urethanemodified resins were lower than that of non-urethane-modified resin. The emulsion and electrodeposition properties of the cationic resins were also deeply affected by the nature of the pendant positively charged group contained in the resins. INTRODUCTIONRecently, major emphasis has been placed on converting all automotive paint facilities to cathodic electrocoating systems due to the superior corrosion protection provided, compared to earlier anodic and spray primer systems. The advantages of electrodeposition are high levels of coating utilization, automation, low levels of pollution, and high throwing power, i.e., the ability to coat the recessed portions of complex shaped metal parts.Cathodic electrodeposition resin systems generally consist of e p~x y l -~ or a c r y l i~~~~ polymer backbones with cationic groups being provided by protonated salt groups. It is the cationic or ionizable group and its hydrophilic nature which allows emulsification in water. Curing may be accomplished by crosslinking of hydroxyl and epoxy groups with isocyanate, phenolic, melamine, or similar reactive groups. The preferred resin for electrodeposition is the DGEBA type epoxy resin obtained by reacting epichlorohydrin with bisphenol A in the presence of sodium hydroxide. The deposition yields of the cationic resins directly prepared by DGEBA epoxy resins with secondary amine are low, that is, the deposited films are thin. In this study, isocyanate-terminated urethanes ( la-c) were first prepared from three different polyglycols ( P G ) and toluene diisocyanate (TDI) , and subsequently reacted with two different monoalcohols to obtain half-blocked PG-TDI-urethanes (2a-f ). Half-blocked PG-TDIurethanes and 2-ethylhexanol-blocked TDI ( 3 ) prepared from 2-ethylhexanol and TDI were used to modify DGEBA epoxy resin to give urethanemodified epoxy resins (4a-g) , which contain urethane as a side chain. These modified epoxy resins were reacted with methylethanolamine and subsequently neutralized with acetic acid to give urethanemodified cationic resins. The monoalcohol used to prepare h...

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Syntheses and properties of cationic amine–epoxy adducts and their use in electrodeposition: I. Diethanolamine/diethylamine terminated cationic epoxy with pendant 2‐ethylhexanol‐blocked TDI groups

Cited by 17 publications

References 5 publications

Preparation of pigment dispersion resin and stable colour paste

Preparation of pigment dispersion resin and stable colour paste

Coemulsion and electrodeposition properties of mixtures of a poly(oxypropylene)‐modified cationic epoxy resin and nonionic crosslinker system

Synthesis and properties of cationic resins derived from urethane‐modified epoxy resins and methylethanolamine

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