Preparation of modified polyesters containing triphosphorous and their applications to PU flame-retardant coatings |
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Authors: | Hong-Soo Park Hyuk-Jae You Hye-Jin Jo II-Woo Shim Hyun-Sik Hahm Seong-Kil Kim Young-Geun Kim |
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Affiliation: | (1) Dept. of Chem. Eng., Myongji University, 449-728 Yongin, Korea;(2) Sam-Hwa Paints Ind. Co. Ltd, 425-110 Ansan, Korea;(3) Korea Institute of Construction Materials, 137-707 Seoul, Korea |
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Abstract: | Three phosphorous functional groups were introduced in one structural unit of polymer backbone to enhance the flame retardancy
of PU coatings. In the first step, we synthesized tetramethylene bis(orthophosphate) (TBOP) that contained two phosphorus
functional groups in one structural unit. In the next step, we synthesized modified polyesters (ATBTP-10,-20,-30) that contained
triphosphorous groups by condensing polymerization of TBOP, 1,4-butanediol, trimethylolpropane, adipic acid, and phenylphosphonic
acid (PPA). The amount of PPA in the ATBTPs was 10, 20, and 30 wt%. Then, flame-retardant PU coatings (AHFC−10,−20,−30) were
prepared by curing ATBTPs with hexamethylene diisocyanate-biuret (curing agent) at room temperature. From the TGA analysis
of diphosphorus-modified polyester (ATBT) and ATBTPs, the residues of ATBT, ATBTP-10, ATBTP-20, and ATBTP-30 were 24.6, 27.5,
29.2, and 31.9%, respectively. From this result, it was found that the residue increased in relation to the amount of PPA.
Physical properties of the films of flame-retardant coatings were deteriorated with the addition of PPA (flame retarding component),
however, all the films of flame-retardant coatings, except AHFC-30, met the required physical properties standard for coatings.
Char lengths of the AHFCs measured by the 45° Meckel burner method were 2.9∼4.8 cm, and LOI values were 28∼31%, which indicates
that the prepared AHFCs showed good flame retardancy. |
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Keywords: | Gel permeation chromatography polymerization polyurethanes cure weatherability packaging titanium dioxide esters phosphate |
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