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Flame-retardant treatment of Lyocell fibers and effects on various fiber properties

机译：Flame-retardant treatment of Lyocell fibers and effects on various fiber properties

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摘要

Hexamethylolmelamine was used as a cross-linking agent to graft 3-(dimethylphosphono)-N-methylolpropionamide (MDPA) onto Lyocell fibers in a posttreatment process to reduce flammability. The effects of processing conditions on the mechanical properties and P content of the fibers were examined. The results show that increasing the MDPA concentration, microwave treatment time, baking temperature, and baking time increases the P concentration in the fibers, although the mechanical properties of the fibers are reduced to varying degrees. The optimal processing conditions comprise a 40 MDPA concentration, a 320 W microwave treatment for 3 minutes, and baking at 160 degrees C for 5 minutes. Under these conditions, flame-retardant Lyocell fibers with a breaking strength of 2.47 cN center dot dtex(-1) and a limiting oxygen index of 34.6 were obtained, which meet the performance requirements for textile fibers. Thermogravimetric data indicate that the residual fiber mass after heating increased from 4.7 before treatment to 21.5 after treatment. There was only a minimal change in the hygroscopicity of the treated Lyocell fibers. In addition, after 30 washes, the limiting oxygen index was decreased to 26.5 while maintaining a good flame-retardant effect.

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