0. Preface
Polyester cotton blended fabrics are very popular among consumers due to their excellent ingredient performance and durability. However, because they are prone to burning, they cause fire accidents and cause huge losses, the research on flame retardant finishing has been reported by the study of fire retardant finishing. General concern [1]. So far, people have found that flame retardant to polyester cotton fabrics is much more difficult than flame retardant to any of the components. The main reasons are: First, because cotton is a flammable fiber that does not melt or shrink. When polyester products burn, the cotton fibers are carbonized, which plays a supporting role like a wick on polyester, thus hindering the The melt droplets of polyester are separated from the fire source; secondly, the mutual heat induction of the two polymers of polyester and cotton or their cracking products accelerates the overflow of the cracking products, so the fire speed of polyester and cotton fabrics is greater than that of pure polyester and pure cotton Much faster; thirdly, during the combustion process, the flame retardant can migrate between the two components of polyester and cotton. Therefore, it also brings difficulties to the flame retardant of polyester cotton fabrics. At the same time, when polyester-cotton blended fabric is heated, the heat-melted polyester component will cover the surface of the polyester fiber, and the polyester fiber and its cracked carbon will form a skeleton, preventing the fabric from shrinking, causing the molten polyester to become a fuel in the ignition zone. , making the fabric burn more violently [2].
So, to reduce the flammability of polyester-cotton blends, the following points must be achieved: (1) Each component in the blended fabric is flame retardant. (2) When flame retardant finishing of blended textile fabrics, use their respective suitable flame retardants, which can complement each other or not interfere with each other. (3) Eliminate the bone valence effect and the interference effect of the two components.
Phospheric and nitrogen-based flame retardants are one of the effective flame retardants on pure cotton fabrics. At the same time, due to the synergistic effect between phosphorus and nitrogen, it is also very important for the application of polyester-cotton blended fabrics. development. This paper uses tetrahydroxymethylphosphorus chloride (THPC) to react with amide compounds and ammonia to form a water-soluble pre-shrinkage body as the flame retardants PN-1 and PN-2. The flame retardants PN-1 and PN-2 utilize the phosphorus-nitrogen flame retardant system to have a significant synergistic effect on the solid-phase flame retardant of cellulose fibers. Because the addition of nitrogen-containing compounds can reduce the amount of phosphorus-based flame retardant, and improve the flame retardant effect. At the same time, nitrogen and phosphorus will first form a phosphoramide structure and then form a P-N bond, which can enhance the reaction ability to phosphorylate with the primary hydroxyl group of the fiber and inhibit the generation of levoxosugar. When the fabric is ignited, the phosphorus in the flame-retardant polymer reacts with the oxygen in the air to produce phosphorus pentoxide (P2O5). Phosphorus pentoxide is a strong dehydrating agent that can be derived from fibers Water molecules are extracted. After phosphorus pentoxide encounters water, polyphosphoric acid is formed. Polyphosphoric acid will continue to remove the water in the fibers, which actually reduces cellulose into non-combustible charcoal. At the same time, polyphosphoric acid is also easy to Cover the outside of the fibers, thereby inhibiting the reaction with oxygen and avoiding the formation of the combustible gas carbon monoxide. When cotton fibers are carbonized, they are equivalent to carbon fibers, and they become the skeleton of synthetic fibers. Synthetic fibers are distributed among the carbon fibers. At this time, most of the synthetic fibers are also unable to burn with the carbon fibers, which prevents the combustion of the fabric. {3}.
This paper mainly conducts a comparative study on the flame retardant properties and finishing conditions of polyester-cotton blended fabrics on the flame retardant properties and finishing conditions of flame retardants PN-1 and PN-2.
Extended reading: https://www .brandfabric.net/dobby-checked-pongee-breathbale-fabric/
Extended reading: https://www.alltextile.cn/product/product-5-373.html
Extended reading: https://www.brandfabric.net/full-dull-nylon-taslon-oxford-breathable-fabric/
Extended reading: https://www.alltextile.cn/product/product-27-319.html
Extended reading: https://www.china-fire-retardant.com/post/9388.html
Extended reading: https://www.alltextile.cn/product/product-27-744.html
