Novel low-temperature oxygen bleaching catalyst and preparation method and application thereof
A catalyst and oxygen bleaching technology, applied in textiles and papermaking, etc., can solve the problems of complex synthesis process, fiber damage, high dosage, etc., and achieve the effect of shortening the process flow and stabilizing the structure
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[0026] In a preferred embodiment, the preparation method of low-temperature oxygen bleaching catalyst of the present invention for example comprises the following steps:
[0027] 1) Take 10-100g of clay material, under normal temperature conditions, impregnate and stir with 1mol / L NaCl solution for 8-12h, then suction filter, and wash with deionized water;
[0028] 2) Add the product in 1) into an ethanol solution of zinc salt, impregnate and stir for 8-12 hours, filter and dry, and set aside;
[0029] 3) Take another ethanol solution of the following substance A, stir, slowly add a certain proportion of the ethanol solution of the following substances B and C dropwise, reflux and stir for 2-5 hours, and obtain the bis-Schiff base ligand;
[0030] 4) Take a certain amount of bis-Schiff base ligand, add the zinc salt-loaded clay prepared in 2), after reflux reaction for 1-3h, then add the ethanol solution of copper salt, continue reflux reaction for 1-3h, and cool to room tempe...
Embodiment 1
[0066] 1. Preparation of low-temperature oxygen bleaching catalyst: Take 20g of bentonite, impregnate and stir with 100ml, 1mol / L NaCl solution for 8 hours, then filter with suction, wash with deionized water; add 200ml, 10g / L zinc chloride ethanol solution, impregnate and stir for 10 hours , filtered and dried. Take 10mmol of m-phthalaldehyde and 15ml of absolute ethanol, stir at room temperature, add dropwise 15ml of ethanol solution containing 8.5mmol of 2,4-dihydroxybenzylamine, reflux and stir for 2.5h, then add dropwise 20ml of 3- The ethanol solution of hydroxy-4-aminopyridine was refluxed for 3 hours to obtain the bis-Schiff base ligand; 15 g of loaded Zn 2+ Ionic bentonite, reflux for 1.5h, then add 10mmol copper acetate, reflux for 2h, cool to room temperature, and remove the solvent.
[0067] 2. Application of the above-mentioned low-temperature oxygen bleaching catalyst:
[0068] 1) Preparation of oxygen bleaching working solution: same as traditional process;
...
Embodiment 2
[0072] 1. Preparation of low-temperature oxygen bleaching catalyst: Take 40g of attapulgite, impregnate and stir with 100ml, 1mol / L NaCl solution for 10h, then suction filter, wash with deionized water; add 200ml, 10g / L ethanol solution of zinc acetate, impregnate and stir for 10h After that, filter and dry. Take 10mmol of terephthalaldehyde and 15ml of absolute ethanol, stir at room temperature, dropwise add 15ml of ethanol solution containing 9.0mmol of 3,4-dihydroxybenzylamine, reflux and stir for 4 hours, then add dropwise 20ml of 2-amino The ethanol solution of -5-hydroxymethylpyridine was refluxed for 4 hours to obtain the bis-Schiff base ligand; 30 g of loaded Zn was added 2+ Ionic attapulgite, reflux for 2 hours, then add 10 mmol of copper nitrate, reflux for 1.5 hours, cool to room temperature, and remove the solvent.
[0073] 2. Application of the above-mentioned low-temperature oxygen bleaching catalyst:
[0074] 1) Preparation of oxygen bleaching working solution...
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