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Preparation method of hollow aluminum oxide ceramic microsphere modified polyurethane coating

A hollow alumina, polyurethane coating technology, used in polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve the problems of mechanical performance failure of coatings, environmental pollution, poor water resistance, etc. The effect of simple process and excellent wear resistance

Inactive Publication Date: 2017-05-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resulting coating decomposes in a heated environment to generate H 2 O, forming pores, accelerating the failure of the mechanical properties of the coating
[0005] It can be seen that traditional solvent-based polyurethane-based coatings have disadvantages such as polluting the environment, poor water resistance, and high density.

Method used

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  • Preparation method of hollow aluminum oxide ceramic microsphere modified polyurethane coating

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Embodiment 1

[0023] This embodiment includes the following steps:

[0024] Weigh 2gAl(NO 3 ) 3 9H 2 0. 5g of glucose was added to 70ml of deionized water, ultrasonicated for 10min, magnetically stirred for 10min, placed in a 100ml polytetrafluoroethylene reactor, and kept at 160°C for 24h; the resulting brown gelatinous liquid was washed with deionized water until The pH value of the solution is about 7, vacuum-dried at 80°C for 24 hours after vacuum filtration; put the obtained product into a high-temperature tube furnace, and sinter at 1200°C for 2 hours to obtain hollow alumina ceramic microspheres.

[0025] Take 0.01 g of hollow alumina ceramic microspheres and add them to 3.3 g of water-based polyurethane coating (solid content: 30%), high-speed dispersion at 6000 rpm for 1.5 h, and ultrasonic dispersion for 0.5 h. The resulting dispersion was coated with a spin coater at a low speed of 600r / min for 30s and a high speed of 1800r / min for 20s; the obtained wet film was placed in a va...

Embodiment 2

[0027] This embodiment includes the following steps:

[0028] Weigh 1gAl(NO 3 ) 3 9H 2 0. Mix 3 g of fructose, add to 70 ml of deionized water, ultrasonicate for 20 min, magnetically stir for 20 min, place in a 100 ml polytetrafluoroethylene reaction kettle, keep warm at 180°C for 22 h; wash the obtained brown gelatinous liquid with deionized water When the pH of the solution is about 7, vacuum-dry at 80°C for 24 hours after vacuum filtration; put the obtained product in a high-temperature tube furnace and sinter at 1300°C for 5 hours to obtain hollow alumina ceramic microspheres.

[0029] 0.1 g of hollow alumina ceramic microspheres were added to 3.3 g of water-based polyurethane coating (solid content: 30%), dispersed at a high speed of 3000 rpm for 1.5 h, and ultrasonically dispersed for 0.1 h. The resulting dispersion was coated with a spin coater at a low speed of 500r / min for 30s, and at a high speed of 2000r / min for 20s; the obtained wet film was placed in a vacuum d...

Embodiment 3

[0031] This embodiment includes the following steps:

[0032] (1) Weigh 4gAl(NO 3 ) 3 9H 2 O. Mix 10 g of fructose, add to 70 ml of deionized water, ultrasonicate for 60 min, magnetically stir for 60 min, place in a 100 ml polytetrafluoroethylene reaction kettle, keep warm at 220°C for 2 h; wash the obtained brown gelatinous liquid with deionized water When the pH value of the solution is about 7, vacuum-dry at 80°C for 24 hours after vacuum filtration; put the obtained product into a high-temperature tube furnace and sinter at 1500°C for 1 hour to obtain hollow alumina ceramic microspheres.

[0033] (2) Add 0.5 g of hollow alumina ceramic microspheres to 3.3 g of water-based polyurethane coating (solid content 30%), disperse at high speed at 6000 rpm for 1 h, and disperse with ultrasonic for 1 h. The resulting dispersion was coated with a spin coater at a low speed of 800r / min for 20s, and at a high speed of 2000r / min for 5s; the obtained wet film was placed in a vacuum dr...

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Abstract

The invention relates to a preparation method of a hollow aluminum oxide ceramic microsphere modified polyurethane coating. The preparation method comprises the following steps: preparing hollow aluminum oxide ceramic microspheres, namely treating aluminum nitrate and monosaccharide raw materials by virtue of steps of ultrasound, magnetic stirring, hydrothermal treatment, heat treatment and the like to obtain the hollow aluminum oxide ceramic microspheres with uniform particle size; and blending the obtained ceramic microspheres with waterborne polyurethane, and carrying out high-speed dispersion, ultrasound, spin coating and curing to obtain a composite coating. The preparation method provided by the invention has the advantages that nontoxic and easily available raw materials are adopted, a preparation process is simple, technology is controllable, cost is low, repeatability is good, and the hollow aluminum oxide ceramic microspheres are uniformly distributed. The prepared composite coating has the characteristics of environmental friendliness, light weight, high strength, high hardness, high wave transmission, low thermal conductivity, low infrared emissivity, excellent wear resistance, excellent weather resistance and the like and can be applied to the fields of heat insulation coatings, infrared stealth and the like.

Description

technical field [0001] The invention belongs to the technical field of functional composite coatings, and relates to a method for preparing polyurethane coatings modified by hollow alumina ceramic microspheres. Background technique [0002] In recent years, the problem of energy consumption has become more and more serious, and people's demand for energy-saving and emission-reducing materials is increasing. The multi-functional coating with heat insulation and wear resistance can effectively reduce the surface and internal temperature of the coating, prolong the life of the equipment, and is of great significance to energy saving and consumption reduction. Multifunctional coatings consist of film-forming substances and functional fillers. Most of the film-forming substances are composed of resins. Traditional solvent-based resins contain a large amount of volatile organic compounds, which are harmful to the environment and have poor water resistance, which greatly limits th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/08C09D7/12
CPCC09D175/04C08K7/24C08K2201/003C09D5/08C09D7/70
Inventor 殷小玮成来飞李新亮韩美康朱文杰崔媛李崇敬马卓
Owner NORTHWESTERN POLYTECHNICAL UNIV
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