SU673681A1 - Method of rendering woollen materials flame-proof - Google Patents

Description

The invention relates to the field of textile industry and can be used to impart wool resistance (wool, fabrics, fabrics) to fire resistance in an atmosphere with a high oxygen content (up to 40%), which is retained after repeated chemical cleanings. There is a method of imparting flame retardant properties to wool materials by treating wool with an aqueous solution of chlorendic acid in an acidic environment. 1 However, using this method, fire-protected wool materials with an oxygen index (CI) of more than 32.5 cannot be obtained. The closest to the proposed method is the method of imparting fire resistance to wool s-ing materials by treatment with 1-1, aqueous solution of sodium tungstate at pH 1.8-3 at boiling. Using this method of MorjTT, wool materials with KI 33i; Z3 can be obtained. The aim of the invention is to increase the fire resistance of wool materials, namely to obtain fire-resistant wool materials with KI 40. The goal is achieved by the fact that the materials additionally process 1-1.5% aqueous solution of chlorendic acid under the same conditions as and a solution of tungsten sodium. The processing of wool materials with these compounds is carried out on the existing equipment, which is dyed for dyeing textile materials with a bath module of at least 20, as follows. Wool material is placed in a dye bark or apparatus designed for dyeing the fiber, where water is poured in, containing sodium tungstate and sulfuric acid. The solution is heated to boiling for 40 minutes with constant stirring and boiled for 20 minutes. Then, chlorendic acid is introduced into the impregnation bath and boiled for another 20 minutes. After that, the wool material is washed with hot water, then diluted with soda solution and cold water to a pH of 6.5-7.5.

Example 1. In a dyeing bed for Cher. In the form of a combed ribbon, 100 kg of wool is loaded, a 1.950 m l ffli milof circulation pump is poured and 20 kg of sodium tungstate (1% solution) j are charged and 5.4 l are added with concentrated Hz 504 to reach pH 2. The solution is heated to the pile, "and in the mating 40 minutes and boil for 20 minutes. Pos THIS & load 20 kg of chloro-endacid acid (1% water solution) and boil for another 20 minutes. Then, wool is washed with hot water (40-50 ° C), 0.5% aqueous soda solution and cold water to a pH of 6.5-7.5. Wool containing wool contains 6.9% chlorine, 6.8% tungsten. Fire-dyeing knit made from obtained fiber has a KI of 40.5%.

 2. In the dye bark placed 50 kg of wool knitted fabric, pour

Concentration in solution

chlorendic acid

will} soda

...... i-f,., -. ,,. 1, 0 1.5 3.0

. ".,. eSt-SisW-Wi-SjA-.-ff.-:

0.96 m of water is charged with 15 kg of sodium tungstate I (1.5% aqueous solution) n Bay $ (L 4.35 l of concentrated H2SO4 (until pH 2 is reached). The solution is heated to boiling for 40 minutes and boiling t 20 minutes After that, 15 kg of chlorendic acid-acid (1.5% aqueous solution) and boil for another 20 minutes are loaded, after this fire protection, the wool knitted fabric is washed with hot water (40-50 C) .0.5 % soda solution and cold water to a pH of 6.5-7.5. Fire retardant wool golotno contains 10.2% chlorine, 8.0% tungsten and has a KI of 44.5.

Table 1C) shows the data characterizing the effect of the treatment conditions on the fire protection of the modified materials of wool.,

28.5 32.0 32.5