Protein fiber low temperature neutral reduction bleaching method

[0024] Example 1

[0025] A low-temperature neutral reduction bleaching method for protein fibers, the steps are as follows:

[0026] (1) Preparation of low-temperature bleaching catalyst: weigh the rare earth chloride and the relatively simple colorless aromatic compound at a molar ratio of 1:1, and put the weighed cerium chloride and o-hydroxybenzoic acid into the In an Erlenmeyer flask with an appropriate amount of distilled water, heat to 40°C under ultrasonic conditions, and stir to make it completely dissolved. Then slowly pour the aqueous solution of cerium chloride into the aqueous solution of o-hydroxybenzoic acid under ultrasonic conditions of 40°C. After stirring for 10 minutes, add concentrated ammonia water to adjust the pH of the solution to 10, and then continue the ultrasonic stirring reaction for 60 minutes. The reacted aqueous solution is allowed to stand at room temperature for 48 hours. The resulting solution is filtered, dried, and ground to obtain a solid powder. ;

[0027] (2) Bleaching protein fibers: prepare a treatment solution consisting of 3g/L thiourea dioxide and 0.05g/L low-temperature bleaching catalyst, and put the protein fibers into the above treatment solution at a bath ratio of 1:10 at a temperature of 30°C Keep the temperature for 60min under the condition, take out the fiber, wash and dry thoroughly.

[0028] Example 2

[0029] A low-temperature neutral reduction bleaching method for protein fibers, the steps are as follows:

[0030] (1) Preparation of low-temperature bleaching catalyst: weigh the rare earth chloride and the colorless aromatic compound with a relatively simple structure at a molar ratio of 1:2, and weigh the ytterbium chloride and lutetium chloride (molar ratio 1:1). ), m-hydroxybenzoic acid and 1-hydroxy-2-naphthoic acid (molar ratio 1:1) were put into an Erlenmeyer flask containing an appropriate amount of distilled water, heated to 50°C under ultrasonic conditions, and ultrasonically stirred to completely dissolve them , And then slowly pour the aqueous solution of ytterbium chloride and lutetium chloride into the aqueous solution of m-hydroxybenzoic acid and 1-hydroxy-2-naphthoic acid under the condition of ultrasound at 60°C. After ultrasonic stirring for 10 minutes, add concentrated ammonia water to adjust the solution After the pH reaches 12, the ultrasonic stirring reaction is continued for 30 minutes, and the reacted aqueous solution is allowed to stand at room temperature for 48 hours. The resulting solution is filtered, dried, and ground to obtain a solid powder;

[0031] (2) Bleaching protein fibers: prepare a treatment solution consisting of 1g/L thiourea dioxide and 0.01g/L low-temperature bleaching catalyst, and put protein fibers into the above treatment solution at a bath ratio of 1:100 at a temperature of 40°C Keep the temperature for 30 minutes, take out the fiber, wash and dry thoroughly.

[0032] Example 3

[0033] A low-temperature neutral reduction bleaching method for protein fibers, the steps are as follows:

[0034] (1) Preparation of low-temperature bleaching catalyst: weigh the rare earth chloride and the relatively simple colorless aromatic compound in a molar ratio of 1:3, and weigh the yttrium chloride, praseodymium chloride, and neodymium chloride (mole Ratio 1:1:1) and 3,5-dihydroxybenzoic acid, 2,3-dihydroxybenzoic acid, 2,6-dihydroxybenzoic acid (molar ratio 1:1:1) were put into the appropriate amount of distilled water In the Erlenmeyer flask under ultrasonic conditions, heat to 50℃, and ultrasonically stir to completely dissolve it, and then slowly pour the aqueous solution of yttrium chloride, praseodymium chloride, and neodymium chloride under the condition of ultrasound at 50℃. 3. In the aqueous solution of 5-dihydroxybenzoic acid, 2,3-dihydroxybenzoic acid, and 2,6-dihydroxybenzoic acid, ultrasonically stirred for 10 minutes and then drop concentrated ammonia water to adjust the pH of the solution to 8, and then continue the ultrasonic stirring reaction for 120 minutes. The reacted aqueous solution was allowed to stand at room temperature for 48 hours, and the resulting solution was subjected to a series of steps such as filtration, drying, and grinding to obtain a solid powder;

[0035] (2) Bleaching protein fibers: prepare a treatment solution consisting of 10g/L thiourea dioxide and 1g/L low-temperature bleaching catalyst, and put protein fibers into the above treatment solution at a bath ratio of 1:4, at a temperature of 40°C After keeping the temperature for 30 minutes, take out the fiber and wash and dry thoroughly.