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Aqueous polyurethane emulsion for synthetic leather and preparation thereof

A water-based polyurethane and synthetic leather technology, applied in textiles, papermaking, fiber treatment, etc., can solve the problems of air permeability and waterproof, etc., and achieve the effect of plump hand feeling, reliable process and sufficient source

Active Publication Date: 2009-07-15
ENDIAN (GUANGDONG) LEATHER GOODS & FASHION TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now polyurethane synthetic leather is close to natural leather in terms of microstructure and physical properties, and even some mechanical properties far exceed natural leather, but breathability and waterproof are a pair of contradictions, and breathability is generally water-permeable. This problem has not been solved.
At present, domestic water-based polyurethane has not fundamentally solved its water resistance and wear resistance, especially the problem of yellowing resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]Add 100 parts of toluene diisocyanate (TDI), 120 parts of polyoxypropylene diol, 20 parts of 2,2-dimethylol propionic acid (DMPA), and 2 parts of tert-butyldimethylsilyl chloride under stirring at room temperature In a reaction vessel with nitrogen gas, the temperature was controlled at 80°C for 5 hours to obtain a prepolymer; at 5°C, the above prepolymer was slowly added dropwise to 500 parts of deionized water dissolved in 10 parts of triethylamine, and the Stir and emulsify, then continue to add 100 parts of nano-silica and 20 parts of (3,3'-diethyl-4,4'-diaminodiphenylmethane) amino-terminated chain extender under high-speed stirring and react at 20°C for 5 hours, to obtain a solid content of 60wt% aqueous polyurethane emulsion.

Embodiment 2

[0022] With 70 parts of dicyclohexylmethane diisocyanate, 160 parts of polyoxypropylene triols, 15 parts of 3-hydroxyl-2-(hydroxymethyl)-2-methyl propionic acid in a reactor isolated from air, Control the reaction temperature at 80°C and react for 6 hours to obtain a prepolymer; at 0°C, slowly add the above prepolymer dropwise to 600 parts of deionized water dissolved in 10 parts of triethylamine, stir and emulsify at high speed, and then Continue to add 20 parts of nano silicon dioxide under stirring, and react at 30°C for 5 hours to obtain an aqueous polyurethane emulsion with a solid content of 55 wt%.

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Abstract

The invention relates to the technical field of synthetic leather materials, in particular to an aqueous polyurethane emulsion for synthetic leather and a preparation method thereof. Environment-friendly aqueous polyurethane resins with different adaptabilities are manufactured by selecting materials with different functions, such as isocyanate, polyester polyol, a modified nano-silicon dioxide and the like by a high-molecular alloy technology. The aqueous polyurethane resin has the advantages of adequate raw material sources, reliable process and high solid content up to 30-40%, no organic solvent in a product, environmental protection and wide application range. The synthetic leather prepared by the aqueous polyurethane emulsion has the advantages of excellent abrasive resistance, high tear strength, high extensibility up to 400-700% and high tensile strength up to 20-45MPa and can replace PVC artificial leather, PU leather and natural leather; the synthetic material has the advantages of good hand feeling, comfort and good recoverability, as well as good water resistance, good abrasive resistance, good acid resistance, good alkali resistance, high temperature resistance and the like; and compared with the traditional synthetic leather, various technical performances of the synthetic material are obviously improved.

Description

Technical field: [0001] The invention relates to the technical field of synthetic leather materials, in particular to an aqueous polyurethane emulsion used for synthetic leather and a preparation method thereof. Background technique: [0002] Polyurethane (PU) synthetic leather has excellent wear resistance, good tear strength and elongation, and at the same time endows leather products with flat surface, full hand feel, comfort, good recovery, and moderate price. Expensive natural leather products have gradually replaced low-grade and cheap PVC artificial leather, and have become an indispensable consumer product in people's lives. Since the birth of polyurethane synthetic leather, it has gone through the development stage of profiling and simulation, and now it has entered the stage of high simulation. Now polyurethane synthetic leather is close to natural leather in terms of microstructure and physical properties, and even some mechanical properties far exceed natural le...

Claims

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Application Information

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IPC IPC(8): D06M15/568D06M13/50D06M11/79D06N3/14
Inventor 周亚民黄国任
Owner ENDIAN (GUANGDONG) LEATHER GOODS & FASHION TECH CORP
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