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Titanium dioxide composite filler, preparation method thereof and reflective heat insulation coating

A technology of reflective thermal insulation coating and titanium dioxide, which is applied in the field of coatings, can solve the problems of affecting thermal insulation effect, low film coating rate, waste of titanium dioxide, etc., and achieve excellent adhesion, increase emissivity, and improve reflective thermal insulation performance.

Inactive Publication Date: 2019-05-03
江苏仁通节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are still some unresolved problems in the preparation of titanium dioxide / hollow glass microsphere composite particles, mainly manifested in the low coating rate of titanium dioxide film on the surface of hollow glass microspheres, uneven film coating, and free titanium dioxide, etc. Affects the heat insulation effect and also causes a lot of waste of titanium dioxide

Method used

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  • Titanium dioxide composite filler, preparation method thereof and reflective heat insulation coating
  • Titanium dioxide composite filler, preparation method thereof and reflective heat insulation coating
  • Titanium dioxide composite filler, preparation method thereof and reflective heat insulation coating

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preparation example Construction

[0031] The invention provides a kind of preparation method of titanium dioxide composite filler, comprises the following steps:

[0032] The hollow glass microsphere suspension is mixed with a modifying agent for modification to obtain activated modified hollow glass microspheres, and the modifying agent is hydrofluoric acid, sodium hydroxide, potassium hydroxide, saturated calcium hydroxide, ten Hexaalkyltrimethylammonium bromide or sodium dodecylbenzenesulfonate;

[0033] Provide titanium tetrachloride ethanol solution;

[0034] After mixing the activated modified hollow glass microspheres with water, adjusting the pH value to 2-4 and heating successively to obtain a suspension;

[0035] After the titanium tetrachloride ethanol solution is added dropwise to the suspension, it is allowed to stand and age to obtain microspheres wrapped in titanium dioxide microcrystals;

[0036] The microspheres wrapped by the titanium dioxide microcrystals are dried and calcined in sequence...

Embodiment 1

[0069] 1. Preparation of titanium dioxide composite filler

[0070] Get 40g of hollow glass microspheres and add 120g of deionized water to prepare a suspension with a mass concentration of 25%, add hydrofluoric acid with a mass concentration of 10%, and stir at 150r / min for 100min; Bake at 120°C for 120 minutes; bake at 80°C for 300 minutes; finally bake at 120°C for 16 hours to obtain activated-modified hollow glass microspheres with a particle size of 65 μm;

[0071] Under stirring at 300r / min, slowly add 30g of titanium tetrachloride into 70mL of absolute ethanol to prepare a 100g / L titanium tetrachloride ethanol solution.

[0072]Prepare the activated modified hollow glass microspheres into a 25% suspension; add hydrochloric acid to adjust the pH value of the suspension to 2; Add one-third of the titanium tetrachloride ethanol solution at a dropping speed; then add one-third of the titanium tetrachloride ethanol solution at a stirring speed of 10g / min at a stirring speed...

Embodiment 2

[0083] 1. Preparation of titanium dioxide composite filler

[0084] Take 50g of hollow glass microspheres and add 150g of deionized water to prepare a suspension with a mass concentration of 25%, add NaOH with a mass concentration of 10%, and stir at 150r / min for 100min; put it in an oven for drying, first at 55°C Bake for 120 minutes; bake at 80°C for 300 minutes; finally bake at 120°C for 16 hours to obtain activated modified hollow glass microspheres with a particle size of 50 μm;

[0085] Under stirring at 300r / min, slowly add 30g of titanium tetrachloride into 170mL of absolute ethanol to prepare a 200g / L titanium tetrachloride ethanol solution.

[0086] Prepare the activated modified hollow glass microspheres into a 25% suspension; add hydrochloric acid to adjust the pH value of the suspension to 3; Add one-third of the titanium tetrachloride ethanol solution at a dropping speed; then at a stirring speed of 200r / min, add one-third of the titanium tetrachloride ethanol s...

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Abstract

The invention provides titanium dioxide composite filler, a preparation method thereof and a reflective heat insulation coating, and belongs to the technical field of coatings. According to the invention, activation and modification are carried out on hollow glass microspheres, so that activity of surfaces of the hollow glass microspheres is effectively improved, compact deposition of titanium dioxide crystals on the surfaces of the microspheres is ensured, and the titanium dioxide film coating rate and coating uniformity on the surfaces of the glass microspheres are improved. The concentration of a titanium tetrachloride ethanol solution is controlled, and the addition speed and stirring speed of the titanium tetrachloride ethanol solution are controlled, so that titanium dioxide crystalswith different particle diameters are formed, and emissivity of the coated microspheres to sunlight is greatly improved. Reflective heat insulation performance of the reflective heat insulation coating prepared by the titanium dioxide composite filler is remarkably improved, hemispherical emissivity, sunlight reflection ratio and near-infrared emissivity all exceed 90%, and excellent comprehensive performance such as adhesive force, flexibility, acid resistance, alkali resistance and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a titanium dioxide composite filler, a preparation method thereof, and a reflective heat-insulating coating. Background technique [0002] Titanium dioxide is currently the most commonly used functional component in reflective insulation coatings. Because the refractive index of titanium dioxide is 2.5-2.8, it is the inorganic oxide with the highest refractive index among pigments and fillers. When titanium dioxide is dispersed in the coating, it can produce a large refractive index difference with the film-forming substance, which can effectively enhance the light scattering ability of the coating and improve the visible light and near-infrared light reflectance of the coating. [0003] Hollow glass microspheres are also an important thermal insulation filler in reflective thermal insulation coatings. It is a kind of hollow glass microspheres whose diameter is distributed in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/33C09D133/04
Inventor 王海平
Owner 江苏仁通节能科技有限公司
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