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A method for preparing dry pu/pvdf hydrophobic polyurethane coating for synthetic leather

A polyurethane coating and synthetic leather technology, applied in the direction of polyurea/polyurethane coatings, synthetic resin layered products, coatings, etc., can solve the problems of poor hydrophobic performance and anti-pollution performance, unfavorable industrial production and economic benefits, and high industrial costs. problems, to achieve the effect of large value, good piezoelectricity, and low cost

Inactive Publication Date: 2015-11-18
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, synthetic leather for ordinary shoes, synthetic leather for sofas, and synthetic leather for car seat cushions use mostly ordinary resins for the surface layer of polyurethane. Although they have a certain hydrophobic function, their hydrophobic performance and anti-pollution performance are relatively poor.
At present, the market mainly relies on silica fillers and hydrophobic additives for treatment in order to achieve the purpose of hydrophobic and anti-pollution. However, this method has high industrial costs and is not conducive to industrial production and economic benefits.

Method used

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  • A method for preparing dry pu/pvdf hydrophobic polyurethane coating for synthetic leather
  • A method for preparing dry pu/pvdf hydrophobic polyurethane coating for synthetic leather
  • A method for preparing dry pu/pvdf hydrophobic polyurethane coating for synthetic leather

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Experimental program
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Effect test

Embodiment 1

[0021] A method for preparing synthetic leather with dry process PU / PVDF hydrophobic polyurethane coating, comprises the following steps:

[0022] 1) First mix HDS-50HF polyurethane PU and polyvinylidene fluoride PVDF according to the mass fraction ratio of 100:5;

[0023] 2) Add nitrogen nitrogen dimethylformamide DMF: acetone MEK = 40:20 mass parts solvent, the solvent includes dimethyl formamide DMF and acetone MEK, disperse the two in the organic solvent, and then add mass parts It is 15 parts of color paste auxiliary materials, configured as a surface layer; also configured according to the ratio of HDA-20 polyurethane PU: nitrogen nitrogen dimethyl formamide DMF: acetone MEK: color paste = 100:20:20:15 For the adhesive layer, the surface layer slurry and the adhesive layer fabric were fully stirred with a vacuum mixer at room temperature for 2 hours, so that their viscosities were respectively at , using a vacuum machine to vacuumize the modified solution for degassing...

Embodiment 2

[0026] A method for preparing synthetic leather with dry process PU / PVDF hydrophobic polyurethane coating, comprises the following steps:

[0027] 1) First mix HDS-50HF polyurethane PU resin and polyvinylidene fluoride PVDF according to the mass fraction ratio of 100:10;

[0028] 2) Add nitrogen nitrogen dimethylformamide DMF: acetone MEK=40:20 solvent in parts by mass, the solvent includes dimethylformamide DMF and acetone MEK, disperse the two in the organic solvent, and then add mass parts 15 parts of color paste and other auxiliary auxiliary materials are configured as a surface layer; also configured as a bonding agent according to the ratio of polyurethane PU: nitrogen nitrogen dimethyl formamide DMF: acetone MEK: color paste = 100:20:20:15 layer, the surface layer slurry and the adhesive layer fabric were fully stirred at room temperature with a vacuum mixer for 2 hours, so that their viscosities were respectively at , using a vacuum machine to vacuumize the modified ...

Embodiment 3

[0031] A method for preparing synthetic leather with dry process PU / PVDF hydrophobic polyurethane coating, comprises the following steps:

[0032] 1) First, mix HDS-50HF polyurethane PU and polyvinylidene fluoride PVDF according to the mass fraction ratio of 100:15. When the ratio of PU to PVDF exceeds 100:15, the film will become hard and brittle, which is not conducive to synthetic leather. ;

[0033] 2) Add nitrogen nitrogen dimethylformamide DMF: acetone MEK = 40:20 mass parts solvent, the solvent includes dimethyl formamide DMF and acetone MEK, disperse the two in the organic solvent, and then add mass parts It is 15 parts of color paste and other auxiliary materials, configured as a surface layer; also configured according to the ratio of HDA-20 polyurethane PU: nitrogen nitrogen dimethyl formamide DMF: acetone MEK: color paste = 100:20:20:15 To form a cohesive layer, the surface layer slurry and the cohesive layer fabric were fully stirred with a vacuum mixer at room t...

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Abstract

The invention discloses a method for preparing a dry-process PU / PVDF (polyurethane / polyvinylidene fluoride) hydrophobic polyurethane coating for synthetic leather. The method comprises the following steps: (1) mixing PU with PVDF; (2) adding an organic solvent with N,N-dimethylformamide (DMF) and methyl ethyl ketone (MEK) in a mass ratio of (0-50): (0-20), adding a color paste aid to prepare a surface layer, preparing a bonding layer in a ratio of PU to DMF to MEK to color paste of (0-100): (0-50): (0-20): (0-15), and fully stirring slurry of the surface layer and a surface material of the bonding layer by a vacuum mixer at room temperature respectively to form viscous solution slurry; and (3) applying a dry-process surface layer coating to release paper, solidifying for forming to obtain a dry-process PU / PVDF surface layer, applying the bonding layer to the surface layer, bonding a wet-process base material of the synthetic leather with the dry-process surface layer by a semi-dry bonding method, and drying and curing to obtain the dry-process PU / PVDF hydrophobic polyurethane coating. After PU / PVDF blending modification, the coating is high in hydrophobicity, pollution resistance, flame retardance coefficient and mechanical tensile strength; the method is simple, low in requirement and low in cost and facilitates industrialization production application of the synthetic leather.

Description

technical field [0001] The invention belongs to the technical field of hydrophobic modification of a polyurethane coating for synthetic leather, and in particular relates to a method for preparing a dry-process PU / PVDF hydrophobic polyurethane coating for synthetic leather. Background technique [0002] Hydrophobic polyurethane coating is a kind of polyurethane material with special properties, which is widely used in the coating field because of its special properties. Hydrophobic polyurethane coating has always been used as a special material in the application field of synthetic leather. Its effective hydrophobic function within a certain range can make synthetic leather materials more comfortable and suitable for human use. Without changing the existing hygienic performance, the hydrophobic performance becomes particularly important, and it is widely used in special garment leather, shoe leather, building material outsourcing coating and other fields. At present, the ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/14B32B37/26B32B27/40C09D175/04C09D127/16
Inventor 王海军李金祥王学川曲峰冯会平雷乐乐赵彦群
Owner SHAANXI UNIV OF SCI & TECH
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