Preparation method of carboxyl-containing epoxy resin tanning agent
An epoxy resin and carboxyl-containing technology, which can be used in animal husbandry, small raw hide/large raw hide/leather skin/fur chemical treatment, application, etc., can solve the problem of slow development of epoxy resin tanning agents, long reaction time, and the amount of organic solvents Large and other problems, to achieve excellent tanning effect, the effect of shortening the tanning time
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Embodiment 1
[0018] Dissolve 0.9g of sodium bisulfite in 69g of distilled water to prepare an aqueous solution of sodium bisulfite; add the aqueous solution of sodium bisulfite into a 250ml three-necked flask, then heat it in a water bath to 65°C, and at the same time start stirring with the mixer at 300rpm, and turn on the condensate , dropwise while stirring therein the mixed monomer that is made up of the allyl glycidyl ether of 11.25g and the methacrylic acid of 29.25g and the ammonium persulfate aqueous solution prepared by the ammonium persulfate of 3.6g and the distilled water of 36g, The dropping time is controlled at 1 hour, and the temperature is kept at 65°C for 3 hours, and finally cooled to room temperature, and the pH value of the reaction system is adjusted to 5.0 with a 30% NaOH aqueous solution to obtain a carboxyl-containing epoxy resin tanning agent.
Embodiment 2
[0020] Dissolve 1.237g of sodium bisulfite in 55.5g of distilled water to prepare an aqueous solution of sodium bisulfite. Add the aqueous solution of sodium bisulfite into a 250ml three-neck flask, then heat it in a water bath to 60°C, and start stirring at 400rpm with the mixer, and turn on the condensation Water, while stirring, dropwise dropwise therein the ammonium persulfate prepared by the allyl glycidyl ether of 15.75g and the methacrylic acid of 23.06g and the ammonium persulfate prepared by the ammonium persulfate of 4.95g and the distilled water of 49.5g Aqueous solution, the dropping time is controlled at 2h, react at a constant temperature at 60°C for 4.5h, and finally cool to room temperature, use NaOH aqueous solution with a mass concentration of 30% to adjust the pH value of the reaction system to 4.0 to obtain carboxyl-containing epoxy resin tanning agent.
Embodiment 3
[0022] Dissolve 1.01g of sodium bisulfite in 64.5g of distilled water to prepare an aqueous solution of sodium bisulfite. Add the aqueous solution of sodium bisulfite into a 250ml three-necked flask, then heat it in a water bath to 58°C, and start stirring at 450rpm with the mixer, turn on Condensed water, while stirring, dropwise dropwise therein the ammonium persulfate prepared by the allyl glycidyl ether of 9g and the methacrylic acid of 31.5g and the ammonium persulfate prepared by the ammonium persulfate of 4.05g and the distilled water of 40.5g Aqueous solution, the dropping time is controlled at 1.8h, constant temperature reaction at 58°C for 4.2h, and finally cooled to room temperature, using NaOH aqueous solution with a mass concentration of 30% to adjust the pH value of the reaction system to 3.5 to obtain carboxyl-containing epoxy resin Tanning agent.
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