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Organic montmorillonite-aqueous polyurethane compound leather finishing agent and method for preparing same

A technology of organic montmorillonite and water-based polyurethane, which is applied in the field of polyurethane leather coating materials, can solve problems such as solvent pollution, and achieve the effects of enhanced water resistance, increased thermal decomposition temperature, and reduced elongation at break

Inactive Publication Date: 2009-09-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early 1960s, PU was used for leather finishing for the first time. Due to its good toughness, high elasticity, cold resistance, wear resistance, and solvent corrosion resistance, it has attracted great attention from the leather industry. However, the problem of solvent pollution is also brought about a series of negative effects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First use a quaternary ammonium salt-hexadecyltrimethylammonium chloride to modify the montmorillonite, and the specific modification examples are as follows:

[0019] Weigh 10.0 g of MMT, swell with distilled water for 1 h, add distilled water to make a 10% montmorillonite dispersion, stir magnetically at room temperature for 30 min, and disperse with ultrasonic waves for 30 min. Weigh 3.5 g of cetyltrimethylammonium chloride, prepare it as a 20% aqueous solution at room temperature, and add it dropwise to the montmorillonite dispersion under strong stirring at 70°C, and the dropping time is controlled at 30 minutes. Reacted for 4h, after the reaction was completed, it was naturally cooled to room temperature, and filtered. Then wash with deionized water and 50% ethanol solution, until 1% AgNO 3 Check for no Cl -1 until. Dry in an oven at 100°C until constant weight, cool in a desiccator, and grind into powder to obtain organic montmorillonite (OMMT).

[0020] The ...

Embodiment 2

[0023] First use a quaternary ammonium salt-octadecyltrimethylammonium bromide to modify the montmorillonite, and the specific modification examples are as follows:

[0024]Weigh 10.0 g of MMT, swell with distilled water for 1 h, add distilled water to make a 15% montmorillonite dispersion, stir magnetically at room temperature for 60 min, and disperse with ultrasonic waves for 30 min. Weigh 4.2 g of octadecyltrimethylammonium bromide, make it into a 20% aqueous solution at room temperature, and add it dropwise to the montmorillonite dispersion under strong stirring at 80°C, and the dropping time is controlled at 30 minutes. Reacted for 4h, after the reaction was completed, it was naturally cooled to room temperature, and filtered. Then wash with deionized water and 50% ethanol solution, until 1% AgNO 3 check no br -1 until. Dry in an oven at 120°C until constant weight, cool in a desiccator, and grind into powder to obtain organic montmorillonite (OMMT).

[0025] The spec...

Embodiment 3

[0028] First use an organic amine-ethylenediamine to modify the montmorillonite. The specific modification examples are as follows:

[0029] Weigh 10.0 g of MMT, swell with distilled water for 1 h, add distilled water to make a 20% montmorillonite dispersion, stir magnetically at room temperature for 60 min, and disperse with ultrasonic waves for 60 min. According to the ion exchange capacity of MMT, 1.0 g of ethylenediamine treated with hydrochloric acid was added, vigorously stirred at 70° C. for 5 h, and after the reaction was completed, it was naturally cooled to room temperature and filtered. Then wash with deionized water and 60% ethanol solution, until 1% AgNO 3 Check for no Cl -1 until. Dry in an oven at 100°C until constant weight, cool in a desiccator, and grind into powder to obtain organic montmorillonite (OMMT).

[0030] The specific operations of the water-dispersed montmorillonite modified polyurethane leather finishing agent are as follows:

[0031] Take a ...

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PUM

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Abstract

The invention discloses an organic montmorillonite-aqueous polyurethane compound leather finishing agent and a method for preparing the same. The method comprises the following steps: firstly using quaternary ammonium salt such as cetyl trimethyl ammonium chloride, octadecyl dihydroxyethyl methyl ammonium bromide and the like, organic amine such as ethylene diamine, octadecylamine and the like, or a silane coupler, polyisocyanate and the like to organically modify montmorillonite to prepare organic montmorillonite; and secondly, performing intercalation reaction of emulsion of a polyurethane resin finishing agent and the organic montmorillonite to obtain the finished product of the organic montmorillonite-aqueous polyurethane compound leather finishing agent. In the method, the quaternary ammonium salt, the organic amine, the silane coupler or the polyisocyanate are used for organically modifying the montmorillonite, so that the interlamellar spacing of the montmorillonite is increased, the micro environment among the lamellas is improved, the compatibility of the montmorillonite and the organic phase is improved, and the intercalation reaction of the polyurethane molecules and the montmorillonite is easily performed; moreover, due to the interlamellar compound of the organic montmorillonite on the polyurethane resin finishing agent, the mechanical property, the thermal resistant stability, the water resistance and the water vapor permeability of the finishing material are improved. When the leather finishing material is applied to leather finishing, the leather finishing material has the advantages of greatly improving the mechanical strength and thermal resistant stability of the coating and having active effects on water resistance, sanitary property and the like of the coating.

Description

technical field [0001] The invention relates to the field of finishing materials for polyurethane leather, in particular to a method for preparing an organic montmorillonite-waterborne polyurethane leather finishing agent. The content mentioned in the present invention is expressed in mass percentage unless otherwise specified. Background technique [0002] Since Professor Otto Bayer, a German, first researched and developed the synthesis of polyurethane (PU) by reacting isocyanate and polyol in 1937, PU has received widespread attention all over the world. Due to the advances in the synthesis technology of plastics, rubber, coatings, adhesives and fibers, the demand for PU is increasing day by day, and PU materials in various forms and properties have emerged as the times require. In the early 1960s, PU was used for leather finishing for the first time. Due to its good toughness, high elasticity, cold resistance, wear resistance, and solvent corrosion resistance, it has at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08K9/04C08K3/34
Inventor 林炜刘倩穆畅道李德富
Owner SICHUAN UNIV
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