| Cotton fiber is a natural cellulose fiber. Cotton is a natural cellulose fiber. Due to its excellent hygroscopic, permeability, comfortability and natural reproducibility, so it plays a important role in the production and application of cotton fiber. However, the common cotton is inflammable, it cannot satisfy the application, thus limiting its potential application.This thesis focuses on the problem of formaldehyde releasing commonly existing in the durability of flame retardant cotton fiber. We use guanidine carbonate and phosphoric acid as raw materials to form flame retardants Guanidine phosphate, and the optimal synthetic process conditions:participation indicate the carbonate with phosphoric acid mole ratio for between 1:1.5～1.8, the final product of pH value can be controlled at 6～8, applied to the non-durability of the flame retardant cotton fabric. The chemical structure of flame retardant was characterized by using infrared spectroscopy (IR). Using GA159-1997 for cotton and polyester-cotton fabric were conducted, and the durability of the flame retardant cotton fabric was studied. Proof performance of its fire-retardant cotton fabric that LOI41, damaged length of 70mm, smoldering, continued burning 0s, and polyester-cotton fabric that LOI39, damage to the length of 80mm, smoldering, continued burning 0s. Guanidine phosphate achieve the non-durability of the flame retardant requirements.Guanidine phosphate graft copolymerization activation:In phosphoric acid environment, with the hydroxyl in cellulose and oxalic acid, using oxalic acid in the two carboxylic acid with a amino, amidation reaction occurs, Another carboxyl with the hydroxyl in cellulose, esterification reaction occurs, which will be on the between graft copolymerization reaction. Have a permanent flame retardancy finishing conditions.Studying the permanent flame retardancy finishing technological factors on flame retardant properties of cotton. determining the optimum flame retardancy finishing conditions were:flame retardant finishing agent for the 150～300g/L, phosphate content of 20～30g/L, a Baptist 2 Rolling, rolling over 90%, drying temperature 75℃, baking temperature:130～150℃, baking time:25～35min. To test the durability of flame retardant, the flame retardant finishing of cotton fabrics by the by soaping 30 times, to limit oxygen index and vertical burn performance loss test results are:destruction of the length of 123mm, limiting oxygen index LOI 32.2. Achieve a permanent flame-retardant finishing results.Using thermal analysis (TG-DTA), cone calorimeter (CONE) analysis the role of guanidine phosphate played in cotton and polyester-cotton phosphate flame burning process. By scanning electron microscope (SEM) analysis of the burning scraps of fabric. Analysis the mechanism of phosphate flame combustion process in the fabric of guanidine phosphate and cotton in the cotton flame-retardant effect in the combustion process.The results show that the introduction of guanidine phosphate, it reduced the cotton fabric after the initial thermal decomposition temperature, but the rate of pyrolysis sharply reduces, in the process of pyrolysis,the quantity and strength of heat releasing of pyrolysis products, is significantly reduced, but at the end temperature 700℃, of solid residual rate increased less than cotton fiber. Although also reduced the phosphate cotton-polyester fabrics, but the initial pyrolysis temperature pyrolysis loss rate, the process of pyrolysis of pyrolysis products of heat and heat intensity, but in the end when the temperature of the solid residual 700℃than pure cotton fiber increased. SEM images show, flame retardant fiber surface layer, is its carbon foaming material protection, the key to play flame retarding, carbon layer, the higher rate of foam, the better the results. |
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