Method for preparing polyacrylate/nano ZnO composite leather finishing agent by Pickering emulsion polymerization

A technology of polyacrylate and emulsion polymerization, which is applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, leather surface treatment, etc. It can solve the problem that it is difficult to form single particles , affect the emulsification ability of nanoparticles, etc., and achieve the effect of good physical and mechanical strength and improved resistance to dry and wet rubbing

Inactive Publication Date: 2015-09-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the drying process, nanoparticles generally agglomerate due to their high specific surface area and surface energy. When they are dispersed in a solvent again, it is difficult to form a single particle, which affects the emulsification ability of nanoparticles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Add 1.08g of zinc acetate dihydrate and 60g of ethanol into a round-bottomed flask, heat to 80°C to dissolve, continue to keep warm and reflux for 30min, and cool naturally to obtain a solution of zinc acetate dihydrate in alcohol;

[0027] Step 2: adding 0.2g lithium hydroxide to the zinc acetate dihydrate alcohol solution, and ultrasonically treating it to obtain nano-ZnO alcohol sol;

[0028] Step 3: Add 60g of distilled water to the obtained alcohol sol, centrifuge after stirring evenly, and wash with water three times, and disperse it in 50g of distilled water again to obtain a nano-ZnO aqueous dispersion;

[0029] Step 4: Transfer the nano-ZnO aqueous dispersion into a 100mL three-necked flask, start stirring, and dropwise add a mixed monomer of 3.79g butyl acrylate and 2.78g methyl methacrylate, continue stirring for 20min, then raise the temperature to 80°C, and start to drop Add ammonium persulfate aqueous solution, continue to keep warm for 5 hours aft...

Embodiment 2

[0034] Step 1: Add 1.14g of zinc acetate dihydrate and 55g of ethanol into a round-bottomed flask, heat to 80°C to dissolve, continue to keep warm and reflux for 30min, and cool naturally to obtain a solution of zinc acetate dihydrate in alcohol;

[0035] Step 2: adding 0.25g lithium hydroxide to the zinc acetate dihydrate alcohol solution, and ultrasonically treating it to obtain nano ZnO alcohol sol;

[0036] Step 3: Add 57g of distilled water to the obtained alcohol sol, centrifuge after stirring evenly, and wash with water three times, and disperse it in 50g of distilled water again to obtain a nano-ZnO aqueous dispersion;

[0037] Step 4: Transfer the nano-ZnO aqueous dispersion into a 100mL three-necked flask, start stirring, and dropwise add a mixed monomer of 3.92g butyl acrylate and 2.65g methyl methacrylate, continue stirring for 25min, then raise the temperature to 80°C, and start to drop Add ammonium persulfate aqueous solution, continue to keep warm for 4 hours af...

Embodiment 3

[0042] Step 1: Add 1.21g of zinc acetate dihydrate and 50g of ethanol into a round-bottomed flask, heat to 80°C to dissolve, continue to keep warm and reflux for 30min, and cool naturally to obtain a solution of zinc acetate dihydrate in alcohol;

[0043] Step 2: adding 0.3g lithium hydroxide to the zinc acetate dihydrate alcohol solution, and ultrasonically treating it to obtain nano-ZnO alcohol sol;

[0044] Step 3: Add 55g of distilled water to the obtained alcohol sol, centrifuge after stirring evenly, and wash with water three times, and disperse it in 50g of distilled water again to obtain a nano-ZnO aqueous dispersion;

[0045] Step 4: Transfer the nano-ZnO aqueous dispersion into a 100mL three-necked flask, start stirring, and dropwise add a mixed monomer of 4.06g butyl acrylate and 2.52g methyl methacrylate, continue stirring for 30min, then raise the temperature to 80°C, and start to drop Add ammonium persulfate aqueous solution, continue to keep warm for 3 hours aft...

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PUM

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Abstract

The invention relates to a method for preparing a polyacrylate/nano ZnO composite leather finishing agent by Pickering emulsion polymerization. When the polyacrylate finishing agent prepared by conventional emulsion polymerization uses a surfactant, the dry/wet rubbing resistance of the finished leather can be lowered. The method comprises the following steps: mixing and heating zinc acetate dihydrate and ethanol to obtain a zinc acetate dihydrate-ethanol solution; adding lithium hydroxide, and carrying out ultrasonic treatment to obtain a nano ZnO alcosol; adding distilled water, stirring, centrifuging, separating, washing with water, and dispersing in distilled water to obtain a nano ZnO water dispersion; and dropwisely adding butyl acrylate-methyl methacrylate mixed monomers, dropwisely adding an ammonium persulfate water solution, keeping the temperature, and cooling to obtain the finishing agent. By using the nano ZnO sol prepared by the sol-gel process instead of the traditional surfactant, the polyacrylate/nano ZnO composite leather finishing agent prepared by Pickering emulsion polymerization has the advantages of favorable physical and mechanical strength and higher dry/wet rubbing resistance.

Description

technical field [0001] The invention relates to a preparation method of a leather finishing agent, in particular to a method for preparing a polyacrylate / nanometer ZnO composite leather finishing agent by a Pickering emulsion polymerization method. Background technique [0002] Leather finishing can increase the beauty of the leather surface, improve the durability of the leather, correct the surface defects of the leather, and expand the use of the leather. As the top coating material of leather, leather finishing agent has a vital impact on the appearance, hygiene performance and physical and mechanical properties of leather products. As consumers have higher and higher requirements for the quality of leather products, the leather industry has higher requirements for leather finishing materials, and the dry and wet rubbing resistance of leather finishing materials is particularly important. Polyacrylate has excellent adhesion, light resistance, weather resistance, etc., ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F2/22C09D133/12C09D7/12C14C11/00
Inventor 高党鸽张金金冯军芳吕斌马建中
Owner SHAANXI UNIV OF SCI & TECH
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