Factors affecting the durability of flame retardant cotton fabric
Flame retardant cotton fabric flame retardant fabric durable flame retardant cloth
1. Flame retardant dosage
In flame retardant During finishing, the amount of flame retardant plays a decisive role in the flame retardant finishing effect and the physical and mechanical properties of the finished fabric.
Within a certain range, as the amount of flame retardant increases, the flame retardant effect of the fabric will continue to improve, but when the flame retardant content reaches a certain amount When the flame retardant dosage continues to increase, the flame retardant effect is no longer improved, and the fabric feels hard, and the whiteness and tear strength decrease. The dosage of flame retardant is too small, cross-linking is insufficient, and washing resistance is poor.
2. Cross-linking agent dosage
Cross-linking agent is used in the flame retardant finishing process The flame retardant and cellulose molecules can be cross-linked to form a network structure to enhance the wash resistance of the flame retardant fabric. Moreover, the film-forming property of the cross-linking agent on the fabric surface directly determines the fabric’s feel, tearing strength, and wash durability. .
The cross-linking agent has little effect on the flame retardant properties of the fabric, but has a great impact on the fabric’s feel, tear strength and durability. The cross-linking agent improves the flame retardancy and washability by cross-linking with fiber macromolecules and covalently combining with the flame retardant. Therefore, if the dosage of the cross-linking agent is too small, it will not be conducive to cross-linking film formation and the washability is poor; if the dosage is too large, the network structure formed will make the fabric feel hard and the strength will be reduced. Therefore, the amount of cross-linking agent should be selected to balance the relationship between hand feel, strength and wash resistance.
3. Catalyst dosage
During the flame retardant finishing process, the catalyst can make the The linking agent quickly cross-links with the flame retardant and cellulose macromolecules during the baking process to improve the flame retardant finishing effect. However, most catalysts are acidic and have a great impact on the strength of fabrics, so the dosage must be strictly controlled.
Appropriate catalysts can improve the flame retardant effect on fabrics. However, when too much is used, the strength of the fabric will be seriously reduced, and the whiteness and hand feel will be slightly reduced because the cotton fabric is resistant to alkali and not acid. The choice of catalyst dosage should fully consider the fabric strength factor, and neutralize with alkali immediately after printing to reduce fabric strength damage.
4. Baking temperature and baking time
Baking temperature and baking time The influence of drying time on flame-retardant finishing fabrics is self-evident. The covalent cross-linking produced by the reaction of flame retardants, cellulose macromolecules, and cross-linking agents must be completed during the baking process. The appropriate baking temperature and baking Time can allow film formation to be sufficient and washability to be enhanced.
If the baking temperature is too high and the baking time is too long, the fabric will become brittle and the tearing strength will decrease. If the baking temperature is too low, the reaction between the flame retardant and the cross-linking agent will be insufficient, and the flame retardant and washability will become worse.
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