Preparation and Shelf‐Life Stability of Aqueous Polyurethane Dispersion

Chinwanitcharoen, Charoen; Kanoh, Shigeyoshi; Yamada, Toshiro; Tada, Kaoru; Hayashi, Shunichi; Sugano, Shunji

doi:10.1002/masy.200451222

Cited by 15 publications

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“…In some cases, a small amount solvent (ca. 10–30% accounts for the weight of the prepolymer) is necessary to lower the viscosity of prepolymer; also, the existing solvent can make the dispersion process easier and the emulsion more stable 25, 26. Several solvents, N,N ‐dimethyl formamide, acetone, methyl ethyl ketone, and NMP, were used to investigate the stability of the emulsions prepared.…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%

Waterborne polyurethanes: Spectroscopy and stability of emulsions

Zhang

et al. 2006

J of Applied Polymer Sci

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“…The stability and particle size of polyurethane dispersions are dependent on various factors such as chemical structure, composition, dispersing procedure and ionic content 9–11, 25–28. The effect of ionic group content on the particle size of our polyurethane dispersions is shown in Figure 3.…”

Section: Resultsmentioning

confidence: 96%

“…Only one composition was studied; previously only polycarbonatediols with a molecular weight of 2000 were used. Stability of polyurethane dispersions is strongly influenced by composition and ionic content,11, 26–28 an important target in an investigation of the role of the composition. In the present study, aqueous polyurethane dispersions derived from isophorone diisocyanate (IPDI), various polycarbonatediols of different molecular weights and dimethylol butyric acid (DMBA) were prepared by the modified method.…”

Section: Introductionmentioning

confidence: 99%

Effect of composition on aqueous polyurethane dispersions derived from polycarbonatediols

Lee

Tsai

2006

J of Applied Polymer Sci

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Aqueous polyurethane dispersions derived from isophorone diisocyanate, various polycarbonatediols of different molecular weights, and dimethylol butyric acid were prepared by a dispersing procedure modified to enhance molecular weight. Particle size, average molecular weight, and tensile properties were determined. The molar ratio of reactants affected the properties of the polyurethane dispersions significantly, with the trends described as the effects of their ionic group and polycarbonatediol soft-segment contents. The molecular weight of the polycarbonatediols also significantly affected the particle size of the aqueous polyurethane dispersions and the film properties. As the molecular weight of the polycarbonatediols decreased, the particle size of the aqueous polyurethane dispersions decreased, and the moduli of the cast films increased, as expected. However, the tensile strength of the cast films decreased as the molecular weight of the polycarbonatediols decreased because of the decrease in elongation at break.

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“…There are a number of subclasses of polyurethanes including fibers, plastics, emulsions etc., but the ones having water in their composition are termed as waterborne polyurethanes. As far as their synthesis is concerned, a number of synthesis routes have been designed in order to get specific physical and chemical properties [4][5][6]. First step of synthesis is similar in all processes involving the formation of prepolymer by the reaction of a polyol with an isocyanate, and this prepolymer is further reacted with chain extenders.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, biological efficiency evaluation and application of sodium alginate-based polyurethane dispersions using cycloaliphatic isocyanate, as antibacterial textile coating

Misbah

Bhatti

Zia

et al. 2019

Journal of Industrial Textiles

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In the present project sodium alginate-based polyurethane dispersions were synthesized by two shot processes, using isophorone diisocyanate, polyethylene glycol (Mn-300), dimethylol propionic acid as internal emulsifier along with other reagents including triethylamine and dibutyltindilaurate catalyst. Molecular characterization was performed by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy. Physical properties were observed and samples were found to be translucent yellow with a stability of more than one year. Biological properties such as blood hemolytic and antibacterial action were also noted in order to check if the samples can be used inside human body for bandage coatings. Synthesized dispersions were found to have considerable blood hemolytic activity and good antibacterial activity. After the complete characterization, dispersions were applied on polycotton blend fabric (50/50). After the treatment, fabric was analyzed for its tear strength, tensile strength pilling resistance and morphological properties by scanning electron microscopy. Fabric treated with polyurethane dispersions has decreased tear strength, enhanced tensile strength, improved pilling resistance and more intact appearance as compared to the untreated fabric.

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Preparation and Shelf‐Life Stability of Aqueous Polyurethane Dispersion

Cited by 15 publications

References 0 publications

Waterborne polyurethanes: Spectroscopy and stability of emulsions

Waterborne polyurethanes: Spectroscopy and stability of emulsions

Effect of composition on aqueous polyurethane dispersions derived from polycarbonatediols

Synthesis, biological efficiency evaluation and application of sodium alginate-based polyurethane dispersions using cycloaliphatic isocyanate, as antibacterial textile coating

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