Abstract
A novel hydrophilic curing agent was prepared through hexamethylene diisocyanate trimer, polyethylene glycol monomethyl ether, and 2-((2-aminoethyl)amino)-ethanesulfonic acid monosodium salt. Then, flame-retardant two-component waterborne polyurethanes and their coatings were synthesized through adding the novel hydrophilic curing agent. Their properties and analysis were characterized through fourier-transformed infrared spectroscopy, differential scanning calorimeter, thermogravimetric, thermogravimetric infrared, limiting oxygen index, and UL-94. As a result, the −NCO content of novel hydrophilic curing agent was 16.4% and above 10.0% about 4 months. Besides, the novel hydrophilic curing agent dispersed well in two-component emulsions and improved themostability and compatibility of two-component flame-retardant waterborne polyurethanes. Meanwhile, the tensile strength of the novel film was 1.5 times than the previous one through adding novel hydrophilic curing agent at the same stoichiometric ratio of −NCO to −OH. What’s more, the best LOI and UL-94 of modified flame-retardant two-component waterborne polyurethane were 29.2% and V-0, respectively.
| Original language | English |
|---|---|
| Pages (from-to) | 2423-2431 |
| Number of pages | 9 |
| Journal | Colloid and Polymer Science |
| Volume | 295 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 1 Dec 2017 |
Keywords
- Coatings
- Cross-linking
- Degradation
- Flame retardancy
- Polyurethanes
- Properties, thermal