Flame retardant properties of polyester aramid sulfone interwoven fabric

The flame retardant properties of polyester aramid sulfone interwoven fabrics are shown in 1. It can be seen from 1 that the flame retardant performance of polyester aramid sulfon fiber interwoven fabric increases with the increase of aramid sulfone fiber content. When the aramosulfon fiber content is 0, the flame retardant property (LOI value) of the fabric is 24.4; when the aramosulfon fiber content is 16, the LOI value is 25; when the aramosulfon fiber content is 14, the LOI value is 25.8 ; When the aromatic sulfone content is 12, the LOI value is 27. This is because the main chain of aryl sulfone fiber contains a large number of benzene rings, which can be condensed into aromatic carbon when burned, producing less gaseous flammable products; and the carbon layer formed can cover the burning polymer. The surface will suffocate the flame. The tensile properties of polyester arylsulfone interwoven fabrics and the mechanical properties of polyester arylsulfone interwoven fabrics are as follows

It can be seen that as the content of aryl sulfone fiber increases, the tensile breaking strength in the warp and weft directions of the interwoven fabric first decreases and then increases. When the aramid fiber content is 0, the breaking strength in the warp direction is 968N and the weft direction is 942N; when the aramid fiber content is 16, the breaking strength in the warp direction is 910N and the weft direction is 810N; when the aramid fiber content is 14 When the warp direction breaking strength is 880N, the weft direction is 746N; when the arylsulfone fiber content is 12, the warp direction breaking strength is 918N, and the weft direction is 779N. This is because the linear densities of the flame-retardant polyester and arylsulfone yarn used in this test are different, and the linear density of polyester is greater than that of arylsulfone yarn. (1) When flame-retardant polyester is used as the warp yarn and polyester arylsulfone fiber blended fiber is used as the weft yarn, the fabric is uneven in the warp and weft directions, which directly causes the warp and weft strength of the fabric to decrease with the increase in the arylsulfone fiber content; (2) When flame-retardant polyester is used as the warp yarn and arylsulfone fiber is used as the weft yarn, the warp and weft surfaces of the fabric are smooth, so the warp and weft strength of the fabric increases to a certain extent. Comprehensive analysis of the flame retardant properties, mechanical properties and other indicators of polyester aryl sulfone fiber interwoven fabrics based on the content of aramid sulfone fiber, it was found that the optimal ratio of polyester and aramid sulfone fiber is 1:1, that is, when flame retardant polyester is used as the warp yarn and aramid sulfone fiber is used as the weft yarn, Polyester aramid sulfone interwoven fabric has good flame retardant and mechanical properties; at the same time, the interwoven fabric has a smooth appearance and compact structure, which is convenient for subsequent processing. Effect of Glue Amount on the Flame Retardant Properties of Interwoven Fabrics In order to further improve the flame retardant properties of polyester aramid sulfone interwoven fabrics, this topic uses non-ionic water-based polyurethane emulsion as the carrier, ammonium polyphosphate, melamine, magnesium hydroxide, thickeners, etc. As an auxiliary, it is compounded into a flame-retardant coating glue, and the above-mentioned optimal ratio of polyester aramid sulfone fiber interwoven fabric is coated and finished to further improve the flame-retardant performance of the fabric. Effect of Glue Amount on Flame Retardant Properties of Polyester Aramid Sulfone Interwoven Fabrics

. It can be seen that the flame retardant performance of polyester arylsulfone fiber fabric increases with the increase of glue amount. When the glue amount is 120gm2, the flame retardant LOI value of the fabric is 27.6; when the glue amount is 140gm2, the LOI value is 28.3; when the glue amount is 160gm2, the LOI value is 29.0; When the glue amount is 180gm2, the LOI value is 29.3; when the glue amount is 200gm2, the LOI value is 29.5. This is because intumescent flame retardant systems such as ammonium polyphosphate and melamine have better flame retardant effects on polyester aramid sulfone fiber fabrics [13-15]. Effect of glue amount on the flame retardant properties of polyester arylsulfone interwoven fabrics 4. Effect of glue amount on the mechanical properties of fabrics 3.4 Effect of glue amount on the tensile properties of interwoven fabrics Effect of glue amount on the tensile properties of polyester arylsulfone interwoven fabrics The influence on stretch performance is shown in 4. It can be seen that the warp breaking strength of polyester aramid sulfone fiber fabric decreases rapidly as the amount of glue increases. When the glue amount is 120gm2, the warp breaking strength of the fabric is 820N; when the glue amount is 140gm2, the breaking strength is 758N; when the glue amount is 160gm2, the breaking strength is 712N; when the glue amount is 180gm2, The breaking strength is 675N; when the glue amount is 200gm2, the breaking strength is 650N. Based on the influence of the glue amount on the flame retardant and mechanical properties of polyester aramosulfone interwoven fabrics, it was found that when the glue amount is 160gm2, the flame retardant and mechanical properties of the interwoven fabrics are more appropriate. At this time, the flame retardant LOI value of the interwoven fabric is 29.0, and the LOI value before coating is 27, which is an increase of 7.4%; the tensile breaking strength of the interwoven fabric is 712N, and the breaking strength value before coating is 918N. dropped by 2.24%. Analysis of combustion characteristics of the cross fabric before and after coating finishing 5 are the scanning electron microscope photos of the residue after combustion of the cross fabric without flame retardant coating [5 (a)] and the cross fabric with a glue amount of 160 gm2 [5 (b)] .

(1) The combustion residue surface of the interfacing fabric that has not been treated with flame retardant coating is relatively flat and smooth. This is because the main components of the combustion residue are polyester droplets produced by incomplete combustion, a small amount of aryl sulfone fiber, partially decomposed incomplete polyester and fillers, and a small amount of carbon residue. These droplets will melt under certain temperature conditions. It may continue to burn. (2) Cross fabric after finishing with flame retardant coatingThere are many holes on the surface of the combustion residue, which is an ideal carbon layer structure. This is caused by the volatile substances released by the decomposition of fabrics and flame retardants. On the one hand, these expanded foam carbon layers can prevent the degradation of polyester. On the other hand, the mass and heat transfer rate of the foam in the carbon layer is slower than that of the dense carbon layer, which can prevent the heat source from transferring to the fabric and isolate the oxygen source, and can prevent or delay the generation of Small molecules can enter the gas phase and play a flame retardant role [16-18]. (a) Unfinished cross fabric (b) Coated fabric after finishing 5 SEM photos of the burning residue of the cross fabric before and after flame retardant coating treatment 4 Conclusion (1) The interweaving of aryl sulfone fiber and polyester is beneficial to improving the fabric’s durability Flame retardant properties, but reduces the mechanical properties of the fabric. When the ratio between the two is 1:1, the limiting oxygen index LOI value of the interwoven fabric is 27%, and the amount of melt droplets and smoke is low; the breaking strength in the warp direction is 918N, and the weft direction is 779N.

(2) The phosphorus-nitrogen-based intumescent flame-retardant coating glue improves the flame-retardant properties of the fabric, but reduces the mechanical properties of the fabric. When the amount of glue applied is 160gm2, the limiting oxygen index LOI value of the interwoven fabric reaches 29, an increase of 7.4%, and there is no smoke and trace amounts of droplets during combustion; the tensile breaking strength of the interwoven fabric is 712N, which decreases by 2. 24%. (3) The optimal coating and finishing process for aryl sulfone polyester interwoven fabrics is: the amount of flame-retardant coating glue is 160gm2, the coating rolling pressure is 0.3MPa, the impregnation time is 0.5h, the pre-baking temperature is 100℃, the time is 4min, and baking Temperature 170℃, time 3min. ikB

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