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A highly water-resistant waterborne polyurethane modified montmorillonite nanocomposite emulsion

A nano-composite and montmorillonite technology, applied in the field of organic-inorganic nano-composite emulsion, can solve the problems of limited wide application, decline, and insignificant improvement in water resistance of the system, and achieve improved mechanical properties, high strength, and good moisture absorption resistance. Effect

Active Publication Date: 2020-03-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties (strength, modulus), adhesion, and water resistance of water-based polyurethane latex films are not comparable to those of traditional solvent-based polyurethanes, which limits the further wide application of the coating film.
Introducing inorganic nanomaterials such as silica, clay, carbon nanotubes, etc. into the waterborne polyurethane system can effectively improve the mechanical properties of the system, but the water resistance of the system does not improve significantly or even declines.

Method used

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  • A highly water-resistant waterborne polyurethane modified montmorillonite nanocomposite emulsion
  • A highly water-resistant waterborne polyurethane modified montmorillonite nanocomposite emulsion
  • A highly water-resistant waterborne polyurethane modified montmorillonite nanocomposite emulsion

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: the preparation of aqueous polyurethane emulsion and film

[0035] Add 24.08g of isophorone diisocyanate (IPDI) and four drops of dibutyltin dilaurate (DBTDL) catalyst into a 250mL four-necked flask equipped with a stirrer, a thermometer and a reflux condenser. Add 70.92g of polycarbonate diol (PCD2000) dropwise into the funnel, and the dropping rate is controlled within 1.5h. After the addition is completed, react at 50±5°C for 1-2h, and the temperature is controlled at 40-50°C; then raise the temperature to 60±5°C ℃, add 5g of dimethylolpropionic acid (DMPA), and react for 3-5h; measure the degree of reaction by toluene-di-n-butylamine back titration until the determined NCO group content reaches the theoretical value; obtain a polyurethane prepolymer.

[0036] Adding deionized water dropwise to the polyurethane prepolymer system for emulsification; forming a film and drying to obtain a water-based polyurethane film.

[0037] Such as figure 1Shown is t...

Embodiment 2

[0038] Example 2: High water resistance waterborne polyurethane / modified montmorillonite nanocomposite and film

[0039] The preparation of waterborne polyurethane / polyetheramine modified montmorillonite nanocomposite emulsion is as follows:

[0040] (1) Organic amine-polyetheramine 2000 is used to modify montmorillonite, the specific modification examples are as follows:

[0041] Weigh 1.0 g of montmorillonite, add 100 ml of distilled water to make a 1% montmorillonite dispersion, and swell for 1 hour. Magnetic stirring at room temperature for 60 minutes, ultrasonic dispersion for 30 minutes. Weigh 1.6g of polyetheramine, add appropriate amount of hydrochloric acid at room temperature, prepare the hydrochloric acid aqueous solution of polyetheramine, add it dropwise to the montmorillonite dispersion under strong stirring at 80°C, control the dropping time at 30min, and react for 5h , after the reaction is completed, naturally cool to normal temperature, filter; then wash wi...

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Abstract

The invention discloses waterborne polyurethane modified montmorillonite nanometer composite emulsion with high water resistance, and belongs to the field of organic-inorganic nanometer composite emulsion. Intercalation modification is carried out on montmorillonite by the aid of acid dissociation polyether amine. Interlayer sodium ions in the montmorillonite are substituted by ammonium ions, andaccordingly the interlayer spacing of the montmorillonite can be increased; groups with isocyanate reaction activity are led into the montmorillonite, then reaction is carried out on formed intercalation-modified organic montmorillonite solution and polyurethane to prepare the waterborne polyurethane modified montmorillonite nanometer composite emulsion which is waterborne polyurethane and montmorillonite nanometer composite emulsion. The waterborne polyurethane modified montmorillonite nanometer composite emulsion has the advantages that the waterborne polyurethane modified montmorillonite nanometer composite emulsion prepared by the aid of methods is good in dispersion stability, inorganic nanometer particles are led into the waterborne polyurethane modified montmorillonite nanometer composite emulsion, accordingly, the thermal and mechanical properties of waterborne polyurethane coatings can be obviously improved, and the barrier properties can be enhanced by montmorillonite lamellar structures; dispersion can be widely applied to the field of high-temperature-resistant food and medicine packages with excellent barrier properties.

Description

technical field [0001] The invention relates to a highly water-resistant water-based polyurethane modified montmorillonite nanocomposite emulsion, belonging to the field of organic-inorganic nanocomposite emulsions. Background technique [0002] Water-based polyurethane uses water as the dispersion medium, and has the advantages of high molecular weight, low viscosity, easy construction, environmental protection, safety, and sanitation. It has been well applied in the fields of coatings, adhesives, inks, and sealants. However, the mechanical properties (strength, modulus), adhesion, and water resistance of waterborne polyurethane latex films are not comparable to those of traditional solvent-based polyurethanes, which limits the further extensive application of the coating film. Introducing inorganic nanomaterials such as silica, clay, carbon nanotubes, etc. into the waterborne polyurethane system can effectively improve the mechanical properties of the system, but the water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/44C08G18/34C08J5/18C08K9/04C08K3/34
CPCC08G18/348C08G18/44C08G18/6659C08J5/18C08K3/346C08K9/08
Inventor 张胜文孔子文伏阳杨凡凡王露露杨一帆汪文杰顾卓圆戴豪杰东为富
Owner JIANGNAN UNIV
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