Preparation of flame retardant waterborne polyurethane and its coating for polyester fabric

doi:10.19491/j.issn.1001-9278.2024.12.012

Abstract

Abstract:

Waterborne polyurethane （PU） was modified with flame⁃retardant polyester polyol as a phosphorus source， and the properties of the resultant modified waterborne PU emulsion， film， and coated polyester fabric were characterized. The results indicated that the flame⁃retardant polyester polyol as a modifier was completely participated in the flame⁃retardant modification of waterborne PU. When the phosphorus content was less than 5 wt%， the flame⁃retardant waterborne PU emulsion presented an aspect from translucent to milky white， its particle size was less than 100 nm， and its centrifugal stability was good. The waterborne PU film exhibited a decrease in the water absorption rate， mechanical properties and cracking temperature with an increase in the phosphorus content， but its mass retention rate increased. The coated polyester fabric reached a nonflammable level at a phosphorus content of 3 wt%. The mechanism analysis indicates that it was feasible to finish polyester fabric with the flame⁃retardant waterborne PU coating.

Key words: waterborne polyurethane, particle size, molecular structure, thermal weight loss, mechanical property, water absorption property, flame retardant property

CLC Number:

TQ323.8

YANG Chen, ZHAO Lixue, LIN Yanping. Preparation of flame retardant waterborne polyurethane and its coating for polyester fabric[J]. China Plastics, 2024, 38(12): 72-76.

Figures/Tables 8

Fig.1. Appearance photo of flame retardant waterborne polyurethane emulsion

Fig.2. Microscopic photos of flame retardant waterborne polyurethane emulsion

Fig.3. Particle size test curve of flame retardant waterborne polyurethane emulsion

含磷量/%	粒径/nm	乳液状态	离心稳定性
0	63.24	透明	无沉淀
1	72.15	半透明	无沉淀
3	84.37	半透明	无沉淀
5	93.46	乳白色	极微量沉淀
7	147.81	微棕黄色	微量沉淀

Tab.1. Performance test results of flame retardant waterborne polyurethane emulsion

Fig.4. Infrared spectrum curve of flame retardant waterborne polyurethane film

Fig.5. Thermogravimetric curve of flame retardant waterborne polyurethane film

Fig.6. Water absorption and mechanical properties of flame retardant waterborne polyurethane film

Fig.7. Limiting oxygen index and damage length of flame retardant waterborne polyurethane film

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