Impact Study Of The Organizational Structure Of The Flame Retardant Viscose Fabric Dyeing And Finishing Processing On Its Flame Retardant Properties

HELON fiber is a new type of flame retardant viscose fiber. HELON fiber has not only the properties of cellulose fiber, but also the excellent flame retardant and high temperature resistance properties. It can be used in many fields. It is found that the flame retardant property of HELON product has decreased greatly when the product was finished by weaving,dyeing and finishing in the application. This paper mainly researches the reason why the flame retardant property of HELON fiber decreased. We obtained the optimal techniques for keeping the best flame retardant property of fabric by designing the fabric texture,dyeing and finishing processes.In this study, we designed some non-woven fabrics by single HELON of different weight and some non-woven fabrics mixed HELON fiber with other fibers. Trough the Limit Oxygen Index (LOI) test, we found that the flame retardant property of single HELON non-woven fabrics enhanced as the fabric weight increasing. When HELON fiber contained more than 60%, the LOI of HELON/FR-PET mixed non-woven fabric was higher than 26. When HELON fiber contained more than 25%, the LOI of HELON/WOOL mixed non-woven fabric was higher than 26.5. Spinning process could decrease the flame retardant on the surface of HELON fiber by means of Friction Coefficient and SEM. The author designed many different fabric textures. Through systematical researches on the combustion of the HELON fabrics, we concluded that the flame retardant property of monolayer HELON fabrics was as following: satin>twill>plain weave fabrics. To keep excellent flame retardant property, we should choose the high tex,high twist and high density when weaving. The flame retardant properties of the double HELON fabrics were better than monolayer fabrics. The LOI of these fabrics were all higher than 31.0. The LOI and fabric weights conformed to the linear regression relationship: LOI=27.946+0.007X. The LOI would enhance along with the increasing of the fabric tightness.The subject has invested the flame retardant property of HELON fiber which treated under the given technological process. Trough the LOI test, we got the results as following: NaOH and H₂SO₄ could decrease the LOI of HELON fiber greatly. The influence of Na₂CO₃ on the flame retardant property of HELON was smaller than those of NaOH and H₂SO₄. The processes may decrease the flame retardant property of HELON fiber at a different degree using some agents like oxidant,salt,reducing agent,boiling water,dry-hot air, etc. Direct dyes and reactive dyes were suitable for dyeing HELON fiber. Anionic surfactants were more suitable for the fiber. Through the analysis of TGA, we founded the weight loss rate of HELON fibers treated with NaOH or H2SO4 was far more than that of the HELON fiber untreated. And the residues of the fibers by NaOH or H₂SO₄ were also declined. It showed that NaOH and H₂SO₄ may decompose the flame retardants. If HELON fiber was weaved and finished using the optimal techniques, the LOI would reach 32.6. The depolymerization rules of polysilicic acid which was treated by all kinds of dyeing and finishing reagents were detected by spectrophotometry. It provided the theoretic gist for the decrease in the HELON fiber's flame retardant property.