Anti-yellowing leather finishing emulsion

[0026] Raw material: allyl-3-methoxy salicylaldehyde: CAS number: 22934-51-6; purchased from Shanghai Xianding Biotechnology Co., Ltd.;

[0027] Raw materials: benzamidine hydrochloride: CAS number: 1670-14-0; purchased from Shanghai Xianding Biotechnology Co., Ltd.;

[0028] see figure 1 Shown, the preparation method of modified polyacrylate resin is:

[0029] Step 1. Add 3mol benzamidine hydrochloride, 20mmol sodium methoxide and 3L solvent tert-amyl alcohol into the reaction kettle, replace the air in the reaction kettle with nitrogen, heat up to 100°C while stirring, and then add 1mol allyl -3-methoxy salicylaldehyde is added in the reactor, after adding, continue to insulate and stir the reaction for 3h, after natural cooling to room temperature, rotary evaporation removes solvent, adopts column chromatography to separate, and chromatographic liquid is n-hexane: acetic acid Ethyl ester=10:3; promptly obtain the anti-yellowing modifier of formula P1 structure;

[0030] ...

[0033] The invention is a kind of anti-yellowing leather finishing emulsion, comprising the following raw materials: 70g of modified polyacrylate resin, 1g of polydimethylsiloxane, 1g of defoamer, 0.5g of leveling agent, 2g of silicon dioxide , 6 g of polypropylene glycol, 15 g of deionized water; the defoaming agent is polyoxyethylene polyoxypropanolamine ether; the leveling agent is carboxymethyl cellulose.

[0034] The preparation method of this anti-yellowing leather finishing emulsion specifically comprises the following steps:

[0035] Step 1: Add deionized water, polypropylene glycol, polydimethylsiloxane, and silicon dioxide in sequence in the batching tank, and stir for 10 minutes at a speed of 200 rpm;

[0036] In the second step, in the solution of the first step, sequentially add modified polyacrylate resin, defoamer, and leveling agent, and stir for 15 minutes at a speed of 400 rpm, then increase the speed to 1000 rpm, Disperse at high speed for 15 minutes;

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[0039] The invention is an anti-yellowing leather finishing emulsion, comprising the following raw materials: 65g of modified polyacrylate resin, 3g of polydimethylsiloxane, 0.5g of defoamer, 1.5g of leveling agent, silicon dioxide 1.5g, polypropylene glycol 5g, deionized water 20g; defoaming agent is polyoxyethylene polyoxypropanolamine ether; leveling agent is carboxymethyl cellulose.

[0040] The preparation method of this anti-yellowing leather finishing emulsion specifically comprises the following steps:

[0041] In the first step, add deionized water, polypropylene glycol, polydimethylsiloxane, and silicon dioxide in sequence in the batching tank, and stir for 7 minutes at a speed of 250 rpm;

[0042]In the second step, in the solution of the first step, sequentially add modified polyacrylate resin, defoamer, and leveling agent, and stir for 10 minutes at a speed of 500 rpm, then increase the speed to 1100 rpm, Disperse at high speed for 20 minutes;

[0043] In the th...