Preparation method of modified intumescent flame-retardant cellulose fibers

[0030] 1. Preparation of intumescent flame retardant system

[0031] Weigh TEOS, organic solvent, and oil bath solution with a mass ratio of 1:6:20 in a container, stir at room temperature for 30 minutes, add a certain amount of acetic acid to adjust the pH to 4, and add ammonium polyphosphate twice the mass of TEOS The temperature of the solution was raised to 70° C. and the stirring was continued for 30 minutes to obtain an intumescent flame retardant system containing modified ammonium polyphosphate, ammonium polyphosphate and TEOS.

[0032] The organic solvent is ethanol, and the oil concentration in the oil bath is 10g / L;

[0033] The ammonium polyphosphate is type I ammonium polyphosphate with a degree of polymerization of 50.

[0034] 2. Preparation of flame retardant viscose fiber

[0035] Add the unoiled fiber in the refining section to the above system, the bath ratio is 1:20, continue to stir for 60 minutes, press and adjust the drying process: bake at 100°C for 2

[0039] 1. Establishment of intumescent flame retardant system

[0040] Weigh TEOS, organic solvent, and oil bath in a mass ratio of 1:2:10 in a container, stir at room temperature for 10 minutes, and add a certain amount of acetic acid to adjust the pH to 5. After adding ammonium polyphosphate of the same quality as TEOS, the temperature of the solution was raised to 40°C and continued stirring for 10 minutes to obtain an intumescent flame retardant system containing modified ammonium polyphosphate, ammonium polyphosphate and TEOS.

[0041] The organic solvent used in the process is ethanol and n-butanol with a mass ratio of 1:1, and the concentration of oil agent in the oil bath is 8g / L;

[0042] The ammonium polyphosphate is type I ammonium polyphosphate with a degree of polymerization of 50.

[0043] 2. Preparation of flame retardant viscose fiber

[0044] Add the unoiled fiber in the refining section to the above system, continue to stir for 30 minutes at a liquor ratio o

[0048] 1. Establishment of intumescent flame retardant system

[0049] Weigh TEOS, organic solvent, and oil bath solution with a mass ratio of 1:3:15 in a container, stir at room temperature for 20 minutes, and add a certain amount of acetic acid to adjust the pH to 4. After adding ammonium polyphosphate 1.5 times the mass of TEOS, the temperature of the solution was raised to 60°C and continued to stir for 20 minutes to obtain an intumescent flame retardant system containing modified ammonium polyphosphate, ammonium polyphosphate and TEOS.

[0050] The organic solvent used in this process is ethanol, n-butanol and isobutanol with a mass ratio of 1:1:1, and the concentration of oil agent in the oil bath is 6g / L;

[0051] The ammonium polyphosphate is type I ammonium polyphosphate with a degree of polymerization of 50.

[0052] 2. Preparation of flame retardant viscose fiber

[0053] Add the unoiled fiber in the refining section to the above system, continue to stir for 20 minut