Preparation and application of phosphate⁃waterborne polyurethane flame retardant for coating of cotton fabrics

doi:10.19491/j.issn.1001-9278.2025.02.015

Abstract

Abstract:

Phosphorus⁃based flame retardant （FHPLC） was synthesized by using bisphenol fluorene （BPFL） and phenylphosphoyl dichloride （BPOD） as raw materials and then grafted onto waterborne polyurethane （WPU） to form a type of phosphate⁃based waterborne polyurethane （FHWPU） flame retardant. The resultant flame retardant was used for the flame⁃retardant coating of cotton fabrics. The feasibility of FHWPU on the flame retardancy of the flame⁃retardant coating of cotton fabrics was investigated. The results indicated that organophosphorus could be effectively grafted onto the FHWPU flame retardant， and the viscosity and particle size of the FHWPU flame retardant increased with an increase in the mass proportion of BPFL. The flame⁃retardant coating formed a dense FHWPU layer on the surface of cotton fabrics， resulting in an improvement in the mechanical and flame⁃retardant properties of cotton fabrics. The increments of the mechanical and flame⁃retardant properties were depressed with a decrease in the mass proportion of BPFL. The coated cotton fabrics reached a non⁃flammable level at a BPFL mass proportion of about 2.5 wt%. The results indicated that the FHWPU flame retardant was feasible for the flame retardancy of the coating of cotton fabrics.

Key words: phosphate?waterborne polyurethane flame retardant, viscosity, molecular structure, micro?morphology, mechanical property, flame retardant property

CLC Number:

TQ320.4

DING Wen. Preparation and application of phosphate⁃waterborne polyurethane flame retardant for coating of cotton fabrics[J]. China Plastics, 2025, 39(2): 82-85.

Figures/Tables 7

Fig.1. Viscosity of the FHWPUs

Fig.2. Synthetic reaction mechanism of the FHPLC ［6］

Fig. 3. FTIR spectra of the FHWPUs

Fig.4. 1H⁃NMR spectra of the FHWPUs

Fig.5. Microstructure of the coated fabric

Fig.6. Mechanical properties of the coated fabric

Fig.7. Flame retardant performance of the coated fabric

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