Preparation method of high-hydrophobicity leather coating agent

A leather finishing agent, high hydrophobic technology, applied in leather surface treatment, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc., can solve water resistance and solvent resistance Poor resistance and other problems, to achieve the effect of improving water resistance and smooth hand feeling

Inactive Publication Date: 2013-02-13
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 polym

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

[0019] 2) Use a constant pressure funnel to simultaneously drop a core layer pre-emulsion composed 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 dissolved into the seed emulsion. Deionized water, after 2h dripping, the core layer emulsion is formed after the constant temperature reaction is completed;

[0020] 3) Then through a constant pressure funnel, add dropwise...

Embodiment 2

[0025] 1) First heat the three-necked flask in a water bath to 47°C, and then add 22 parts of a deionized aqueous solution containing 0.6 parts of emulsifier and 0.12 parts of sodium bicarbonate to the three-necked flask according to the mass parts. After the emulsification is uniform, add another 5 parts Mix monomer A, stir for 20 minutes, then add 3.5 parts of a deionized aqueous solution containing 0.08 parts of potassium persulfate, 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 simultaneously drop a core layer pre-emulsion composed of 0.1 parts of emulsifier, 2.5 parts of deionized water, 5.5 parts of mixed monomer A and 3 parts of 0.030 parts of initiator potassium persulfate dissolved into the seed emulsion. Deionized water, after 2.5 hours of dripping, the core layer emulsion is formed after the constant temperature reaction is completed;

[0027] 3) Then through a constant pressure fun...

Embodiment 3

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

[0033] 2) Use a constant pressure funnel to simultaneously drop a core layer pre-emulsion composed 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 into the seed emulsion. Deionized water, after 2h dripping, the core layer emulsion is formed after the constant temperature reaction is completed;

[0034] 3) Then through a constant pressure funnel, add dropwise a shell pr...

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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 adopting semi-continuous seed emulsion polymerization. Background technique [0002] The leather coating process plays a very important role in the leather processing process. On the one hand, the coating material forms a bright and colorful film on the leather surface to make the leather surface smooth and uniform in color. On the other hand, it can improve the use value of finished leather. [0003] Among the many leather finishing agents, the acrylic resin leather finishing agent has strong adhesion, smooth and bright coating film, resistance to torsion, stable structure and aging resistance, and has the advantages of low price, safety, non-combustibility, non-toxic, and low environmental pollution. It is the most widely used film-forming substance in leather finishing materials. However, acryl...

Claims

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Application Information

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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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