Preparation of waterborne polyurethanes using an amphiphilic diol for breathable waterproof textile coatings

The application of polyurethanes (PUs) on breathable waterproof fabric coatings requires a balance of water vapor permeability (WVP) and water resistance which can be achieved by tailoring hydrophilic and hydrophobic segments. PU prepolymers were prepared from isophorone diisocyanate, dimethylol but...

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Veröffentlicht in:Progress in organic coatings 2009-12, Vol.66 (4), p.382-386
Hauptverfasser: Meng, Qing Bo, Lee, Sung-Il, Nah, Changwoon, Lee, Youn-Sik
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container_end_page 386
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container_start_page 382
container_title Progress in organic coatings
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creator Meng, Qing Bo
Lee, Sung-Il
Nah, Changwoon
Lee, Youn-Sik
description The application of polyurethanes (PUs) on breathable waterproof fabric coatings requires a balance of water vapor permeability (WVP) and water resistance which can be achieved by tailoring hydrophilic and hydrophobic segments. PU prepolymers were prepared from isophorone diisocyanate, dimethylol butanoic acid, and a mixture of various ratios of amphiphilic PPG2050 (copolymer of ethylene oxide and propylene oxide with –OH end groups) and hydrophobic poly(tetramethylene ether glycol) (PTMEG). After neutralization with triethylamine, the prepolymers were chain-extended with ethylene diamine/1,4-butanediol (1:1 by molar). The WVP values of the fabric coatings prepared using various waterborne PUs were very similar (910–990 g/m 2 × 24 h). When waterborne PUs prepared using a mixture of PPG2050 and PTMEG were employed for the textile coatings, the resulting PU-coated textiles exhibited excellent waterproof properties (>10,000 mm H 2O). The textile coatings prepared from PPG2050/PTMEG-based waterborne PUs were significantly more waterproof than those prepared from poly(ethylene glycol) (PEG)/poly(propylene glycol) (PPG)/PTMEG-based waterborne PU. This is probably due to a more even distribution of hydrophobic segments in the PUs, even though the WVP values of the PEG/PPG/PTMEG-based PU coatings were considerably smaller than those of the PPG2050/PTMEG-based PU coatings.
doi_str_mv 10.1016/j.porgcoat.2009.08.016
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source ScienceDirect Journals (5 years ago - present)
subjects Amphiphilic diol
Breathable waterproof fabric coating
Water vapor permeability
Waterborne polyurethane
title Preparation of waterborne polyurethanes using an amphiphilic diol for breathable waterproof textile coatings
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