Aqueous-based polyurethane with dual-functional curing agent

“…It was observed that thermal stability of cured PU films were improved with the increase in content of flame retardant; this was related to the fact that there is a formation of polymeric network between the PU backbones and reactive flame retardant. LOI values were also improved with increase in phosphorous and nitrogen content [75] .…”

Section: Unsaturated Polyestersmentioning

confidence: 90%

Reactive Modification of Thermoplastic and Thermoset Polymers using Flame Retardants: An Overview

Wazarkar

Kathalewar

Sabnis

2015

Polymer-Plastics Technology and Engineering

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Flame retardants are the chemicals used in thermoplastics, thermosets, textiles and coatings to arrest the spread of fire. There are basically two ways to improve flame retardancy, namely additive and reactive. It was observed that the reactive modification enhances flame retardancy of polymer to the greater extent than the additive route. Hence in this review, more emphasis is given to the reactive approach. Following review depicts various flame retardants that can be incorporated to thermoplastic and thermosetting polymers, their mechanism of action and their combined effect on flame retardant properties of polymer system in which they are incorporated in.

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“…The gel ratio (G) of the UVWPU specimen was tested by immersing the UVWPU films in acetone at 48 h and was calculated by Equation (2) [15,16]: (2) where M 2 and M 1 are the weight of UVWPU film before and after purification, respectively.…”

Section: Gel Contents Of the Filmmentioning

confidence: 99%

Preparation and characterization of the heat-resistant UV curable waterborne polyurethane coating modified by bisphenol A

Fang¹,

Shang²,

Huang³

et al. 2010

Express Polym. Lett.

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In this study, the modified ultraviolet (UV) curable waterborne polyurethane was obtained from isophorone diisocyanate (IPDI), polyethylene glycol (PEG, MW=600), α,α-dimethylol propionic acid (DMPA), hydroxyethyl acrylate (HEA) and bisphenol A. The rigid moiety was introduced into the main chain of polyurethane to improve its heat-resistance. The copolymer structure was confirmed by Fourier transform infrared spectroscopy (FT-IR). Thermal property and UV curable behavior of the coatings were investigated. The glass transition temperature (Tg) of the modified film was determined by differential scanning calorimetry (DSC). Thermal gravimetric analysis (TGA) was employed to investigate the thermal stability of the modified film. The results show that the average particle diameters increased from 69.25 to 95.12 µm as the content of bisphenol A increased from 0.00 to 9.25%. The optimum bisphenol A dosage was 7.23% (wt%), the Tg of the modified film increased by 7.07°C and 5% weight-loss temperature (233°C) increased by 14°C. The optimum irradiation time was 10–20 minutes after the coatings being painted on an armor plate at room temperature and initiator dosage was 5% (wt%) of the latex

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Aqueous-based polyurethane with dual-functional curing agent

Cited by 34 publications

References 11 publications

Improvement in flame retardancy of polyurethane dispersions by newer reactive flame retardant

Improvement in flame retardancy of polyurethane dispersions by newer reactive flame retardant

Reactive Modification of Thermoplastic and Thermoset Polymers using Flame Retardants: An Overview

Preparation and characterization of the heat-resistant UV curable waterborne polyurethane coating modified by bisphenol A

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