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Method for preparing hollow glass microsphere coating titanium dioxide

A technology of hollow glass microspheres and titanium dioxide, applied in chemical instruments and methods, dyeing organosilicon compound treatment, inorganic pigment treatment, etc., can solve problems such as uneven deposition of titanium dioxide, low coating efficiency of titanium dioxide, and large amount of titanium raw materials. Achieve the effects of increased reflectance, high-efficiency coating, and increased whiteness

Inactive Publication Date: 2011-04-06
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patent for titanium dioxide-coated hollow microspheres (see Chinese patents CN1927954A, CN101293755A) is limited to how to coat hollow glass microspheres, and does not activate the surface of hollow glass microspheres before coating, so that hollow glass TiO2 coating efficiency of microbeads is low
Moreover, the coating method basically uses one stirring speed from the beginning to the end of the reaction, so there are often a series of problems such as a large amount of titanium raw material, low utilization rate, and uneven deposition of titanium dioxide.

Method used

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  • Method for preparing hollow glass microsphere coating titanium dioxide
  • Method for preparing hollow glass microsphere coating titanium dioxide
  • Method for preparing hollow glass microsphere coating titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At room temperature, put 10g of hollow glass microspheres in a 50g beaker of 0.1mol / L NaOH solution, stir for 20min at a controlled stirring speed of 100r / min, then let it soak for 5h, dilute with distilled water, filter with suction, and rinse for 2-3 Secondary to neutral, dry at room temperature for later use; prepare 30g of a solution with a mass ratio of ethanol to water of 9.0:1, add 0.15g of 3-aminopropyltriethoxysilane (kh550) and stir evenly, then add micro beads, stirred at 70°C and 70r / min for 2h, directly suction filtered, and placed in a 100°C oven to react for 2h to obtain activated modified hollow glass microspheres.

[0031] Add 5g of activated and modified hollow glass microspheres and 50g of distilled water into a four-neck flask, and fully stir for 15min at 70°C and 200r / min stirring speed to obtain a uniformly dispersed suspension of hollow glass microspheres; drop at a constant speed within 4h Add 60 g of titanium sulfate solution with a mass fractio...

Embodiment 2

[0033] The activation treatment of the hollow glass microspheres follows the corresponding part of Example 1.

[0034] Add 5g of activated and modified hollow glass microspheres and 50g of distilled water into a four-necked flask, and fully stir for 15min at 50°C and 200r / min stirring speed to obtain a uniformly dispersed suspension of hollow glass microspheres; drop at a constant speed within 3h Add 57g of titanium sulfate solution with a mass fraction of 7%, and at the same time adjust the pH value to 5 with potassium hydroxide with a mass fraction of 8%, and control the stirring speed at 400r / min during the first 1 / 5 of the reaction of dripping the titanium solution. After the 4 / 5 reaction time, control the stirring speed to 100r / min; after the reaction is completed, let it stand for half an hour, filter it with suction, rinse it with distilled water for 2-3 times, dry it at 25°C, 50min at 60°C, and dry at 135°C 1h, heat up to 600°C at a rate of 60°C / min for 4h, and cool to...

Embodiment 3

[0036] Put 10g of hollow glass microspheres in a 50g beaker of 0.5mol / L KOH solution, stir at a controlled stirring speed of 80r / min for 25min, then let it soak for 2h, dilute with distilled water, filter with suction, and rinse 2 to 3 times until medium Dry at room temperature for later use; prepare 30g of a solution with a mass ratio of ethanol to water of 8.6:1, add 0.3g of 3-(2,3-epoxypropoxy)propyltrimethoxysilane (kh560) and stir evenly and add an appropriate amount The acetic acid promotes the hydrolysis of kh560, then add the microbeads for drying, stir at 80°C and 50r / min for 1h, filter directly, and put them in an oven at 80°C for 5h to obtain activated modified hollow glass beads .

[0037] Titanium dioxide-coated hollow glass microspheres are treated according to the corresponding part of the implementation case 2. The effective utilization rate of titanium sulfate in the above process reaches 80%. This product can be directly used as a filler in reflective thermal...

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Abstract

The invention discloses a method for preparing titanium dioxide for coating surfaces of hollow glass microspheres. The method comprises: washing the hollow glass microspheres with alkali liquor to remove impurities and etching to improve activity; performing surface activation and modification by using a silane coupling agent; mixing the activated hollow glass microspheres and distilled water in a mass ratio of 1:10; fully stirring at 40 to 90 DEG C; in the stirring process, dripping solution of titanium sulfate at a constant speed with in 2 to 6 hours according to a mass ratio of the hollow glass microspheres to the titanium sulfate of 1:0.8-1:1.6; slowly adding alkali liquor, keeping the pH value of the reaction system between 5 and 7, and stirring first at a speed of 400r / min for the first 1 / 5 of reaction time and then at a speed of 100 to 300r / min for the rest 4 / 5 of reaction time; and after the reaction is finished, standing, performing suction filtration, washing with distilled water, drying and calcining. The hollow glass microspheres coated with the titanium dioxide can serve as filler for reflective and thermal-insulation coating. Compared with common hollow glass microspheres, the hollow glass microspheres can be used for preparing and synthesizing high-performance coating combining various thermal-insulation mechanisms.

Description

technical field [0001] The invention relates to a preparation method for efficiently coating titanium dioxide on the surface of activated modified hollow glass microspheres. Firstly, the hollow glass microspheres are subjected to surface activation modification treatment, and then an improved liquid phase deposition method is adopted, so that titanium dioxide microcrystals can be more effectively deposited on the surface of the hollow glass microspheres, thereby significantly improving the utilization rate of titanium salt. Background technique [0002] Hollow glass microspheres are a light non-metallic inorganic material, the main components of which are silica and alumina. It not only has the advantages of light weight and large size, low thermal conductivity, high compressive strength, good dispersion fluidity, and high stability, but also has insulation, self-lubricating, sound insulation, non-absorbent, fire-resistant, corrosion-resistant, radiation-resistant, and non-t...

Claims

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Application Information

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IPC IPC(8): C09C1/40C09C1/28C09C3/06C09C3/12C09D7/12C09D5/00C09D5/33
Inventor 俞成丙张云吕霞芮英宇
Owner SHANGHAI UNIV
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