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Anti-yellowing leather finishing emulsion

A technology of anti-yellowing and finishing, applied in the direction of coating, can solve the problems of loss of protection, temperature sensitivity, affecting the appearance of leather products, etc., to achieve the effect of protection from damage

Inactive Publication Date: 2020-04-14
王磊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are many kinds of leather products on the market, but the leather is prone to yellowing due to the influence of the surrounding environment during use. Once yellowing occurs, it will affect the appearance of leather products, especially white and light-colored leather. Therefore, research on durability Yellowing type leather finishing materials have great social and economic significance
[0003] Polyacrylate finishing agent is widely used. Its emulsion uses water as the dispersion medium. The polymerization synthesis process is simple. The polymer emulsion film is flexible and elastic. The coating has excellent light resistance, aging resistance and wiping resistance. Thermoplastic materials are sensitive to temperature, have poor resistance to high and low temperatures, and after long-term exposure to sunlight, the polymer inside the coating will undergo aging behaviors such as degradation, rearrangement, or excessive crosslinking, which is manifested by a decrease in the gloss of the coating , discoloration, yellowing, chalking, brittleness, etc., which will eventually cause the coating to peel off and lose its protective effect

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[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] ...

Embodiment 2

[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;

[0...

Embodiment 3

[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...

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PUM

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Abstract

The invention discloses an anti-yellowing leather finishing emulsion, which is prepared from the following raw materials in parts by weight: 65 to 80 parts of a modified polyacrylate resin, 1 to 3 parts of polydimethylsiloxane, 0.5 to 1.5 parts of an antifoaming agent, 0.5 to 1.5 parts of a leveling agent, 1.5 to 3 parts of silicon dioxide, 5 to 8 parts of polypropylene glycol and 10 to 20 parts of deionized water. According to the invention, the polyacrylate resin is modified, and the anti-yellowing modifier is prepared, is introduced into the polyacrylate resin in a cross-linking manner, andis firmly connected into the resin in a chemical bond manner, so that the polymers in a leather coating are effectively protected from an oxidation reaction, the good scrubbing resistance is achieved, and leather can resist yellowing for a long time.

Description

technical field [0001] The invention belongs to the technical field of leather processing, and in particular relates to an anti-yellowing leather finishing emulsion. Background technique [0002] There are many kinds of leather products on the market, but the leather is prone to yellowing due to the influence of the surrounding environment during use. Once yellowing occurs, it will affect the appearance of leather products, especially white and light-colored leather. Therefore, research on durability Yellowing leather finishing materials have great social and economic significance. [0003] Polyacrylate finishing agent is widely used. Its emulsion uses water as the dispersion medium. The polymerization synthesis process is simple. The polymer emulsion film is flexible and elastic. The coating has excellent light resistance, aging resistance and wiping resistance. Thermoplastic materials are sensitive to temperature, have poor resistance to high and low temperatures, and aft...

Claims

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Application Information

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IPC IPC(8): C09D133/12C08F220/14C08F212/32
CPCC08F220/14C09D133/12C08F212/32
Inventor 王磊徐金金江川
Owner 王磊