Method for improving efficiency of waterborne polyurethane in synthetic leather production

A technology of water-based polyurethane and synthetic leather, which is applied in the direction of textiles and papermaking to achieve the effects of reducing production costs, optimizing performance, and shortening film-forming time

Inactive Publication Date: 2018-11-30
刘志
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to address the existing problems and provide a method for improving the efficiency of water-based polyurethane in the production of synthetic

Method used

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  • Method for improving efficiency of waterborne polyurethane in synthetic leather production

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Embodiment 1

[0019] A method for improving the efficiency of water-based polyurethane in the production of synthetic leather, adding the following mass fractions of raw materials to the water-based polyurethane dispersion: 2.5% organometallic sol, 0.4% thickener, 0.20% defoamer, 0.12% Leveling agent, 0.05% white carbon black, stirred and mixed at 700 rpm for 10 minutes, the prepared emulsion slurry was passed through a 120-mesh filter screen, and water-based polyurethane synthetic leather was prepared by conventional dry film transfer method;

[0020] The preparation method of the organometallic sol is as follows: add 15 grams of antimony pentoxide powder, 80 milliliters of tetrahydrofuran, and 1.2 grams of sodium hydroxide to a three-necked flask, stir well, slowly add 15 milliliters of acetone, and heat to reflux for 4 hours , the heating temperature is 65°C, after the reaction is completed, use hydrochloric acid to dissolve and neutralize until the pH value is in the range of 6.8-7.0, an...

Embodiment 2

[0030] A method for improving the efficiency of water-based polyurethane in the production of synthetic leather, adding the following mass fractions of raw materials to the water-based polyurethane dispersion: 2.6% organometallic sol, 0.45% thickener, 0.23% defoamer, 0.13% Leveling agent, 0.06% white carbon black, stirred and mixed for 13 minutes at 750 rpm, the prepared emulsion slurry was passed through a 130-mesh filter screen, and the water-based polyurethane synthetic leather was prepared by a conventional dry method transfer film method;

[0031] The preparation method of the organometallic sol is as follows: add 15.5 grams of antimony pentoxide powder, 82 milliliters of tetrahydrofuran, and 1.3 grams of sodium hydroxide into a three-necked flask, stir evenly, slowly add 18 milliliters of acetone, and heat to reflux for 4.5 hours , the heating temperature is 68°C, after the reaction is completed, use hydrochloric acid to dissolve and neutralize until the pH value is in th...

Embodiment 3

[0041] A method for improving the efficiency of water-based polyurethane in the production of synthetic leather, adding the following mass fractions of raw materials to the water-based polyurethane dispersion: 2.7% organometallic sol, 0.5% thickener, 0.25% defoamer, 0.14% Leveling agent, 0.08% white carbon black, stirred and mixed at 800 rpm for 15 minutes, the prepared emulsion slurry was passed through a 150-mesh filter, and water-based polyurethane synthetic leather was prepared by conventional dry method transfer film method;

[0042] The preparation method of the organometallic sol is as follows: add 16 grams of antimony pentoxide powder, 85 milliliters of tetrahydrofuran, and 1.5 grams of sodium hydroxide into a three-necked flask, stir well, slowly add 20 milliliters of acetone dropwise, and heat to reflux for 5 hours , the heating temperature is 70°C, after the reaction is completed, use hydrochloric acid to dissolve and neutralize until the pH value is in the range of ...

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Abstract

The invention relates to the field of biomimetic materials, and discloses a method for improving efficiency of waterborne polyurethane in synthetic leather production. No solvent is added in a used waterborne polyurethane dispersion solution, the molecular weight of a prepolymer is increased by increasing of the molar ratio of reaction groups, the waterborne polyurethane dispersion solution has the advantages of good dispersion and stable storage, bonding effects exist between added sol particles and the waterborne polyurethane, through adsorption and permeation effects, the chemical bonding degree of the added sol particles and the waterborne polyurethane is increased sharply, the surface tension of the waterborne polyurethane emulsion is decreased, the stability of the emulsion is increased, the surface energy is decreased, the wetting leveling property is changed to an excellent state, the viscosity is increased to 100-105 (mPa. s), no additional thickener is added, the evaporationenergy is reduced, and the film-forming time is greatly reduced. The production cost of waterborne polyurethane synthetic leather is reduced by compounding, and properties are optimized.

Description

technical field [0001] The invention belongs to the technical field of research and development of bionic materials, and in particular relates to a method for improving the efficiency of water-based polyurethane in the production of synthetic leather. Background technique [0002] Natural leather is widely used in the production of daily necessities and industrial products due to its excellent natural characteristics. However, with the growth of the world population, the human demand for leather has doubled, and the limited amount of natural leather has long been unable to meet this demand. In order to solve this contradiction, scientists began to research and develop artificial leather and synthetic leather decades ago to make up for the deficiency of natural leather. The research history of more than 50 years is the process of artificial leather and synthetic leather challenging natural leather. As an emerging industry with broad development prospects, the synthetic leath...

Claims

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Application Information

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IPC IPC(8): D06N3/14D06N3/00
CPCD06N3/0061D06N3/0063D06N3/0097D06N3/14D06N2211/28
Inventor 刘志
Owner 刘志
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