Preparation method of aqueous polyurethane coating with modified kaolin as filler

A technology of water-based polyurethane and kaolin, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as serious environmental hazards, achieve obvious improvement in comprehensive performance, good storage stability, and simple ball milling process

Inactive Publication Date: 2016-10-12
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prepares solvent-based polyurethane coatings, and a large amount of organic solvents volatilized during the film-forming process are harmful to the environment.

Method used

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  • Preparation method of aqueous polyurethane coating with modified kaolin as filler

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation method taking modified kaolin as the waterborne polyurethane coating of filler, comprises the following steps:

[0031] (1) Disperse 60 g of uncalcined kaolin and 0.9 g of bis(dioctylpyrophosphate acyloxy)ethylene titanate in 120 ml of absolute ethanol; grind for 1 hour at a ball mill speed of 200 r / min, and recover anhydrous ethanol, and dried in an oven at 50°C for 24 hours to obtain a hydrophilic modified kaolin.

[0032] (2) Mix 85g of water-based polyurethane, 15g of hydrophilic modified kaolin, 0.5g of water-based silicone defoamer and 1.5g of non-ionic water-based polyurethane thickener; ball mill and disperse for 1h under the condition of planetary ball mill speed 200r / min to obtain improved Waterborne polyurethane coating with non-toxic kaolin as filler; its tensile strength is 19MPa, elongation at break is 443%, hardness is Shao A68, water absorption is 2.47%, and maximum thermal decomposition temperature is 359°C.

Embodiment 2

[0034] A kind of preparation method taking modified kaolin as the waterborne polyurethane coating of filler, comprises the following steps:

[0035] (1) Disperse 60 g of uncalcined kaolin and 0.9 g of bis(dioctylpyrophosphate acyloxy)ethylene titanate in 120 ml of absolute ethanol; grind for 1 h at a ball mill speed of 200 r / min, Recover absolute ethanol and dry in an oven at 50°C for 24 hours to obtain hydrophilic modified kaolin.

[0036] (2) Mix 82g of polyurethane emulsion, 18g of hydrophilic modified kaolin, 0.5g of water-based silicone defoamer and 1g of non-ionic water-based polyurethane thickener; ball mill and disperse for 1.5h under the condition of planetary ball mill speed 200r / min to obtain improved Water-based polyurethane coating with non-toxic kaolin as filler; its tensile strength is 20.7MPa, elongation at break is 448%, hardness is Shore A75, water absorption is 1.64%, and maximum thermal decomposition temperature is 371°C.

Embodiment 3

[0038] A kind of preparation method taking modified kaolin as the waterborne polyurethane coating of filler, comprises the following steps:

[0039] (1) Disperse 60 g of uncalcined kaolin and 0.9 g of bis(dioctylpyrophosphate acyloxy)ethylene titanate in 120 ml of absolute ethanol; grind for 1 h at a ball mill speed of 200 r / min, Recover absolute ethanol and dry in an oven at 50°C for 24 hours to obtain hydrophilic modified kaolin. .

[0040] (2) Mix 78g of polyurethane emulsion, 22g of hydrophilic modified kaolin, 0.5g of water-based silicone defoamer and 0.5g of non-ionic water-based polyurethane thickener; ball mill and disperse for 2h under the condition of planetary ball mill speed 200r / min to obtain improved Waterborne polyurethane coating with non-toxic kaolin as filler; its tensile strength is 24MPa, elongation at break is 420%, hardness is Shore A82, water absorption is 1.31%, and maximum thermal decomposition temperature is 379°C.

[0041] Titanate-modified kaolin ...

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Abstract

The invention provides a preparation method of an aqueous polyurethane coating with modified kaolin as a filler. The preparation method comprises (1) dispersing 8-12g of uncalcined kaolin and 0.12-0.15g of a titanate coupling agent in 15-20ml of anhydrous ethanol, grinding the dispersion for 30-60 minutes, carrying out drying and recovering ethanol so that hydrophilic modified kaolin is obtained, (2) mixing 78-85g of aqueous polyurethane, 15-21g of modified kaolin, 0.5g of a defoaming agent and 0.5-1.5g of a thickening agent and carrying out ball milling dispersion for 30-60min to obtain the aqueous polyurethane coating with modified kaolin as a filler. The modified kaolin has a suspension rate of 85-92% in water. The preparation method has the advantages of use of the cheap filler, simple ball milling process, low energy consumption and environmental protection. By adding a high amount of hydrophilic modified kaolin to the aqueous polyurethane coating, the comprehensive performances of the coating is obviously improved. The aqueous polyurethane coating film is hard and strong in an adhesive force and has good water resistance and weatherability.

Description

technical field [0001] The invention relates to the field of coating applications, in particular to a preparation method of a water-based polyurethane coating using modified kaolin as a filler. Background technique [0002] Water-based polyurethane coating is a water-based coating that uses water-dispersible polyurethane resin as the base material and uses water as the dispersant during construction and application. It has the advantages of good physical and mechanical properties of the paint film, good corrosion resistance, and can be cured at room temperature or even low temperature; through the selection of raw materials, the combination of components and the application of additives, it can produce paints with different performance characteristics in different fields. coating. Compared with traditional solvent-based coatings, the biggest advantage of water-based polyurethane coatings is that the amount of volatile organic solvents is greatly reduced or the existence of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/12
CPCC09D175/04C08L2205/025C09D7/62C08L75/04C08K9/04C08K3/346
Inventor 黄毅萍石阳阳宋海峰许戈文张良良
Owner ANHUI UNIVERSITY
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