Preparation method of high-hydrophobicity leather coating agent

A leather finishing agent, high hydrophobic technology, applied in leather surface treatment, small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc. It can solve the problem of water resistance and solvent resistance. problems such as poor performance, to achieve the effect of improving water resistance and smooth feel

Inactive Publication Date: 2014-08-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of poor water resistance and solvent resistance of acrylic resin leather finishing agents, and to provide a core-shell type fluorine-containing polymer with high solid content prepared by semi-continuous seed emulsion polymerization that can endow leather finishing agents with high hydrophobicity. The method of acrylic ester highly hydrophobic leather finishing agent

Method used

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  • Preparation method of high-hydrophobicity leather coating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) First, heat the three-necked flask to 45°C in a water bath, and then add 22 parts of deionized aqueous solution in which 0.6 parts of emulsifier and 0.1 part of sodium bicarbonate are dissolved in the three-necked flask according to the number of parts by mass. After the emulsification is uniform, add 5 parts Mix monomer A, stir for 20 minutes, then add 3.5 parts of deionized aqueous solution in which 0.06 parts of ammonium persulfate is dissolved, stir for 30 minutes, heat up to 75°C, and react for 30 minutes to obtain a seed emulsion;

[0019] 2) Add the core layer pre-emulsion consisting of 0.1 parts of emulsifier, 2.5 parts of deionized water, 5.5 parts of mixed monomer A and 3 parts of 0.024 parts of initiator ammonium persulfate into the seed emulsion at the same time with a constant pressure funnel Deionized water, after 2 hours of dripping, the core layer emulsion is formed after the constant temperature reaction is completed;

[0020] 3) Add the shell pre-em...

Embodiment 2

[0025] 1) First, heat the three-necked flask to 47°C in a water bath, and then add 22 parts of deionized aqueous solution in which 0.6 parts of emulsifier and 0.12 parts of sodium bicarbonate are dissolved in the three-necked flask according to the number of parts by mass. After the emulsification is uniform, add 5 parts Mix monomer A, stir for 20 minutes, then add 3.5 parts of deionized aqueous solution in which 0.08 parts of potassium persulfate is dissolved, stir for 30 minutes, heat up to 77°C, and react for 30 minutes to obtain a seed emulsion;

[0026] 2) Use a constant pressure funnel to add dropwise the core layer pre-emulsion consisting of 0.1 parts of emulsifier, 2.5 parts of deionized water, 5.5 parts of mixed monomer A and 3 parts of initiator potassium persulfate dissolved in 0.030 parts Deionized water, after 2.5 hours of dripping, the core layer emulsion is formed after the constant temperature reaction is completed;

[0027] 3) Add the shell pre-emulsion consis...

Embodiment 3

[0032]1) First, heat the three-necked flask to 50°C in a water bath, and then add 22 parts of deionized aqueous solution in which 0.6 parts of emulsifier and 0.14 parts of sodium bicarbonate are dissolved in the three-necked flask according to the number of parts by mass. After the emulsification is uniform, add 5 parts Mix monomer A, stir for 20 minutes, then add 3.5 parts of deionized aqueous solution in which 0.07 parts of ammonium persulfate is dissolved, stir for 30 minutes, heat up to 79°C, and react for 30 minutes to obtain a seed emulsion;

[0033] 2) Use a constant pressure funnel to add dropwise the core layer pre-emulsion consisting of 0.1 parts of emulsifier, 2.5 parts of deionized water, 5.5 parts of mixed monomer A and 3 parts of 0.028 parts of initiator ammonium persulfate dissolved in the seed emulsion Deionized water, after 2 hours of dripping, the core layer emulsion is formed after the constant temperature reaction is completed;

[0034] 3) Add the shell pre...

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Abstract

The invention relates to a preparation method of a high-hydrophobicity leather coating agent. The acrylate leather coating agent has excellent film-forming property, light stability, weather resistance and binding property, but has some defects, such as poor water resistance, poor solvent resistance, lack of functionality and the like, due to the linear structure of the acrylate resin. In order to overcome the defects above, the invention provides a semicontinuous seed emulsion polymerization method for preparing the core-shell acrylate resin: the shell is properly cross-linked, so that the acrylate resin is converted into a reticular structure from the linear structure, thereby enhancing the water resistance and solvent resistance of the acrylate resin; and besides, organic fluorine is introduced into the shell, so that the acrylate resin has high hydrophobicity. After the high-hydrophobicity leather coating agent forms a film, the contact angle with water is up to 124 degrees, and the film feels smooth and not sticky; the 24-hour water absorptivity is less than 10%; and after being soaked in methylbenzene for 48 hours, the film only swells, but is not dissolved.

Description

technical field [0001] The invention relates to a method for preparing a leather finishing agent, in particular to a method for preparing a highly hydrophobic leather finishing agent by semi-continuous seed emulsion polymerization. Background technique [0002] The leather finishing process plays a very important role in the leather processing process. On the one hand, the finishing material forms a bright and beautiful film on the leather surface, making the leather surface smooth and uniform in color. On the other hand, it can improve the use value of finished leather. [0003] Among many leather finishing agents, acrylic resin leather finishing agents have strong adhesion, smooth and bright coating film, flex resistance, stable structure and aging resistance, and have the advantages of cheap, safe, non-combustible, non-toxic, and less environmental pollution. It is the most widely used film-forming substance in leather finishing materials. However, acrylic resin is a li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/18C08F220/14C08F212/08C08F230/08C08F220/22C08F2/24C08F2/26C08F220/06C09D133/08C14C11/00
Inventor 马建中鲁娟鲍艳时春华
Owner SHAANXI UNIV OF SCI & TECH
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