Synthesis of Fluorocyclotriphosphazene Derivatives and Their Fire-Retardant Finishing on Cotton Fabrics

Table 5

Effect of the crosslinking agent concentration on the fire-retardant performance.

Crosslinking agent concentration /%	Afterflame time/s	Afterglow time /s	Burning char length/cm	Breaking strength/N (weft)
3	4	0	9.9	211.7
5	3	0	8.9	206.5
7	2	0	7.8	199.7
9	1	0	6.9	194.9

Cotton fabric was treated with crosslink agent, 35% (owf) fire-retardant agent, 2% (owf) catalyst MgCl₂, 5% (owf) urea and was cured at 160°C for 3 min.