Hydrophobic polyurethane powder clear coatings with lower curing temperature: Study on the synthesis of new blocked polyisocyanates

The method of the synthesis of blocked polyisocyanates (bPIC) used as a crosslinking agent for hydrophobic and low temperature curing powder coatings was developed. In the synthesis of polyisocyanates (PIC) isophorone diisocyanate, glycerine, xylitol, polyethylene glycol and polysiloxane KF-6000 as...

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Bibliographic Details
Published in:Progress in organic coatings 2021-10, Vol.159, p.106402, Article 106402
Main Authors: Czachor-Jadacka, Dominika, Pilch-Pitera, Barbara, Byczyński, Łukasz, Kisiel, Maciej, Zioło, Aleksandra
Format: Article
Language:English
Subjects:
Blocked polyisocyanates
Contact angle
Crosslinking
Curing agents
Diisocyanates
Gloss
Hydrophobicity
Infrared spectroscopy
Liquid chromatography
Low temperature
Low temperature curing
Mass distribution
MDF coating
NMR spectroscopy
Polyethylene glycol
Polyisocyanate
Polysiloxanes
Polyurethane resins
Powder coatings
Scratch resistance
Synthesis
Thermodynamic properties
Xylitol
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Summary:The method of the synthesis of blocked polyisocyanates (bPIC) used as a crosslinking agent for hydrophobic and low temperature curing powder coatings was developed. In the synthesis of polyisocyanates (PIC) isophorone diisocyanate, glycerine, xylitol, polyethylene glycol and polysiloxane KF-6000 as well as two different blocking agents, i.e. acetone oxime and butanone oxime were used. The chemical structure of the obtained blocked polyisocyanates was confirmed by IR and NMR spectroscopy and the molecular mass distribution was investigated using gel permeation chromatography (GPC). The thermal behavior and the deblocking process were investigated by means of TG, DSC and DMA. The obtained coatings were evaluated by performing the following tests: roughness, gloss, scratch resistance, hardness, adhesion to the steel and water contact angle. As part of this research, the hydrophobic and high scratch resistance coatings cured at 150 °C were developed. •The method of new blocked polyisocyanates synthesis for powder coatings was developed.•The influence of curing agent structure on coating curing process was described.•The deblocking process of PICs and thermal behavior of cured coatings were investigated.•The coatings cured at 150 °C characterized by high hydrophobicity and scratch resistance
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2021.106402