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Leather retanning agent and preparation method thereof

A technology for retanning agent and leather, applied in the field of leather auxiliary preparation, can solve the problems of poor tear resistance, poor dyeing, poor absorption and penetration, etc., and achieves improved tear resistance, improved softness, and easy penetration. absorption effect

Active Publication Date: 2018-04-17
SHANGHAI GOLD LION CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The products prepared by the prior art, when used in leather retanning, tend to cause low tear strength of the leather, not durable, and discolored
And the preparation method of existing various acrylic resin retanning agents, mostly based on acrylic acid polymer, mainly to solve a certain aspect or improve some performance, there is no technology to improve the tear strength of leather
Most of the existing technologies are based on the polymerization of acrylic acid or one or two monomers. The synthesized samples are mainly composed of anionic carboxyl strong polar groups, and the resulting products have poor dyeing in tanning.
Moreover, the lubricating effect on leather is poor, the lubricating effect on leather fibers is not enough, the tear resistance is poor, and the hand feel is not good
At the same time, most of the existing schemes are based on solution polymerization, so the synthesized emulsion has a large particle size, poor absorption and penetration during retanning, uneven distribution of materials in the leather, poor integrity of the finished leather, and poor hand feeling

Method used

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  • Leather retanning agent and preparation method thereof
  • Leather retanning agent and preparation method thereof
  • Leather retanning agent and preparation method thereof

Examples

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Effect test

preparation example Construction

[0021] The present invention also provides a kind of preparation method of leather retanning agent:

[0022] S1, preparation material 1;

[0023] Water, emulsifier, butyl acrylate, isooctyl acrylate, hydroxyl-containing acrylate, mercapto-containing compound and unsaturated carboxylic acid are in a mass ratio of 40:1-5:10-25:30-70:10- The ratio of 30:1-5:5-30 was mixed to prepare material 1 in the form of emulsion. The emulsification condition of the material 1 obtained by mixing the above materials in the above ratio is good, that is, the emulsification of the monomer, and then the retanning agent obtained by the subsequent polymerization has a small emulsion particle size and is easy to penetrate and absorb. Moreover, butyl acrylate, isooctyl acrylate, and hydroxyl-containing acrylate are used as reaction raw materials, so that the retanning agent obtained by polymerization contains a variety of groups with different polarities, which can greatly improve the tear strength o...

Embodiment 1

[0045] The present embodiment provides a kind of leather retanning agent, and its structural formula is as follows:

[0046]

[0047] This embodiment also provides a kind of preparation method of retanning agent;

[0048] S1, preparation material 1;

[0049] Mix 40 kg of water and 3 kg of sodium lauryl sulfate with 60 kg of butyl acrylate, 20 kg of isooctyl acrylate, 15 kg of hydroxyethyl acrylate, 3 kg of n-dodecyl mercaptan and 10 kg of methyl The acrylic acid was mixed and stirred well to obtain material 1.

[0050] S2, preparation material 2;

[0051] Material 2 was prepared by mixing 20 kg of water and 1.2 kg of ammonium persulfate.

[0052] S3, prepare retanning agent;

[0053] After adding 80 kg of water into the reactor, add 0.1 kg of ammonium persulfate to mix, stabilize the temperature of the reactor at 85°C, then drop the material 1 and material 2 prepared above into the reactor at the same time, and the dropping time for 4 hours. After the dropwise additio...

Embodiment 2

[0056] The retanning agent provided in this example has basically the same structural formula as that provided in Example 1, except that R is changed to potassium ions.

[0057] This embodiment also provides a kind of preparation method of retanning agent;

[0058] S1, preparation material 1;

[0059] Mix 40 kg of water and 1 kg of sodium dodecyl sulfonate with 30 kg of butyl acrylate, 10 kg of isooctyl acrylate, 10 kg of hydroxyethyl acrylate, 1 kg of iso-mercaptopropionic acid and 5 kg of acrylic acid. Stir well to obtain material 1.

[0060] S2, preparation material 2;

[0061] Material 2 was prepared by mixing 20 kg of water and 0.8 kg of potassium persulfate.

[0062] S3, prepare retanning agent;

[0063] After adding 80 kg of water into the reactor, add 0.3 kg of potassium persulfate to mix, stabilize the temperature of the reactor at 80°C, then drop the material 1 and material 2 prepared above into the reactor at the same time, and the dropping time for 3.5 hours. ...

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PUM

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Abstract

The invention relates to the field of preparation of leather assistants, and in particular relates to a leather retanning agent and a preparation method thereof. The leather retanning agent has the structural formula as shown in the specification, wherein R is a metal ion and R1 is alkane containing hydroxyl. The retanning agent emulsion is small in grain size and easy to penetrate and absorb, andthe polymer contains various groups of different polarities, so that the anti-tearing strength of the leather can be improved greatly, the flexible performance of the leather is improved, and the leather is dyed fully, and is very good in absorptivity.

Description

technical field [0001] The invention relates to the field of preparation of leather auxiliary agents, and in particular to a leather retanning agent and a preparation method thereof. Background technique [0002] When the products prepared by the prior art are used for leather retanning, it is easy to cause the leather to have low tear strength, not durable and discolored. And the preparation method of existing various acrylic resin retanning agents, mostly based on acrylic acid polymer, mainly to solve a certain aspect or improve some performance, there is no technology to improve the tear strength of leather. Most of the prior art is based on the polymerization of acrylic acid or one or two monomers. The synthesized samples are mainly composed of anionic carboxyl strong polar groups, and the resulting products are poor in dyeing in tanning. Moreover, the lubricating effect on leather is poor, the lubricating effect on leather fibers is not enough, the tear resistance is p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/20C08F220/06C08F222/02C14C3/22
CPCC08F220/18C08F220/1804C14C3/22C08F220/1808C08F220/20C08F220/06C08F222/02
Inventor 董茂胜谢衡
Owner SHANGHAI GOLD LION CHEM CO LTD