Synthesis and properties of anionic aqueous polyurethane dispersions

Lu, Mangeng; Lee, J. Y.; Shim, Mi-Ja; Kim, S. W.

doi:10.1002/app.2368

Cited by 2 publications

(3 citation statements)

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“…Among PU ionomers, anionic PU dispersions have been most frequently used in many applications 7–11. The preparation and properties of anionic PU dispersions have been fully researched 12–20. Until now, however, no detailed research on the stability of dispersions has been reported, although this property is very crucial to the manufacture and application of waterborne PUs.…”

Section: Introductionmentioning

confidence: 99%

Waterborne polyurethanes: Spectroscopy and stability of emulsions

Zhang

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:We prepared waterborne polyurethanes based on isophorone diisocyanate, dimethylolpropionic acid, polyhexane neopentyl adipate glycol, or polyethylenebutylene adipate glycol through self-emulsion (a prepolymerization process). Their IR and NMR spectroscopic properties were investigated, and the peaks of these spectra were assigned. The stability of the emulsions was studied on the basis of the shelf life and particle size distribution of emulsions. The effects of solvents, hard-segment content, carboxylic group content, extenders, and feeding methods on the stability of the emulsions were determined to show that N-methylpyrrolidone was a good solvent for retaining the stability of emulsions; particle sizes decreased with increasing COOH content and decreasing hard-segment content, whereas the extenders and feeding methods studied had little effect on the stability of the emulsions. The causes of the stability of the emulsions are discussed according to the analysis of the molecular and particulate structures.

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Section: Introductionmentioning

confidence: 99%

Waterborne polyurethanes: Spectroscopy and stability of emulsions

Zhang

et al. 2006

J of Applied Polymer Sci

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“…Though, the development of aqueous polyurethane dispersions was motivated primarily by environmental considerations, one technical advantage of aqueous polyurethane dispersion is that the viscosity of dispersion is independent of the molecular weight of polymer. Thus, polyurethane dispersion can be prepared at a high solid content with a molecular weight high enough to form films with excellent performance solely by physical drying [2]. Economical aspect is another reason as they do not contain the expensive solvents [3].…”

Section: Introductionmentioning

confidence: 99%

“…An aqueous polyurethane dispersion is a binary colloid system in which polyurethane particles are dispersed in a continuous aqueous medium [1,2]. The basic building blocks of solvent borne polyurethanes like diisocyanates, polyols, amines catalysts, and additives are common to aqueous-based system as well [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoalumina on the Electrochemical and Mechanical Properties of Waterborne Polyurethane Composite Coatings

Dhoke

Rajgopalan

Khanna

2013

Journal of Nanoparticles

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A nanocomposite coating was formed by incorporating nanoalumina pigment in a waterborne polyurethane dispersion (WPUD) to different loading levels (0.1% and 1.0% by weight). Electrochemical performance of the nanocomposite coating was evaluated by applying these nanomodified coatings on mild steel substrate and exposing them to salt-spray, humidity, and accelerated UV weathering. The surface morphology of the composite coating was evaluated using various analytical techniques. SEM and AFM were used to investigate the dispersion of nanoalumina pigment and surface morphological changes of the nanomodified coating, before and after exposure to the test environment. Mechanical properties like scratch resistance were studied by using nanoscratch technique (Nanoindenter TI-900, Hysitron Inc, USA) and hardness using pencil hardness test method. The results showed an improvement in the corrosion, UV weathering, and mechanical properties of the coatings at lower concentration (0.1% by wt), indicating the positive effect of addition of nanoalumina pigment to the coating.

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Synthesis and properties of anionic aqueous polyurethane dispersions

Cited by 2 publications

References 0 publications

Waterborne polyurethanes: Spectroscopy and stability of emulsions

Waterborne polyurethanes: Spectroscopy and stability of emulsions

Effect of Nanoalumina on the Electrochemical and Mechanical Properties of Waterborne Polyurethane Composite Coatings

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