CN110845900A - Preparation method of hollow colorful heat-insulation filler with heat dissipation performance - Google Patents
Preparation method of hollow colorful heat-insulation filler with heat dissipation performance Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/29—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for multicolour effects
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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Abstract
A preparation method of a hollow colorful heat-insulating filler with heat dissipation performance belongs to the technical field of heat-insulating filler preparation. The invention utilizes the principle that metal nitrate can precipitate under the alkaline condition to accumulate precipitates on the surface of hollow glass beads, and a layer of compact nonferrous metal surface film is formed through the calcination effect, so that the hollow colorful heat-insulating filler with heat dissipation performance is prepared. The hollow colorful filler prepared by the invention not only has high reflectivity, but also has good heat insulation effect. The product of the invention is mainly applied to wires and outdoor electronic components, after a certain amount of heat dissipation filler is mixed, the heat dissipation performance of the coating can be directly enhanced, so that a dual heat dissipation mode that the surface coating is mainly in a reflection heat insulation mode when the electronic components work in the daytime and the surface coating is mainly in a heat dissipation mode when the electronic components work at night is realized, and the product has good industrial application prospect.
Description
Technical Field
The invention relates to a preparation method of a hollow colorful heat-insulating filler with heat dissipation performance, in particular to a method for coating the surfaces of hollow glass beads with colorful heat-insulating filler by a complex precipitation method, and belongs to the technical field of heat-insulating filler preparation.
Background
The process for heat preservation and heat insulation by using the coating is relatively simple, is convenient to operate, and is particularly applied to products with high temperature (more than 700 ℃), short time (within 5 min) or needing heat preservation and heat insulation at one time. The film-forming material of the coating is usually selected from silicone resin with high heat-resisting temperature, the heat-resisting temperature can exceed 1000 ℃ in a short time, however, the selection and application of filler are also the key to meet the heat-insulating property at high temperature. The heating temperature is 750 ℃, the heat preservation and insulation time is 3min, and the temperature after heat insulation is controlled within 200 ℃.
The traditional heat insulation coating mainly selects powder filler with low heat conductivity coefficient, and meets the heat insulation requirement at high temperature by using a certain coating thickness. The hollow microsphere filler has the characteristics of low bulk density, high temperature resistance, high strength, low shrinkage rate, acid and alkali corrosion resistance, heat insulation, sound insulation, low water absorption rate and the like, has obvious advantages in the aspect of improving the heat preservation and heat insulation properties of the coating, and enables the high temperature resistant heat insulation coating to be more suitable for the heat preservation and heat insulation requirements of products in a high temperature environment.
Most of the heat-insulating fillers appearing on the market are white hollow titanium dioxide, and due to the characteristic of no pollution resistance, the heat-insulating fillers cannot be well applied to aspects of actual life. At present, a plurality of coating color plating technologies appear in other aspects, the problem of stain resistance is well solved, and rich and colorful visual effects are brought to people. However, most of the colors adopt colored heavy metal ions, and due to the adverse effect on environmental protection, the nation has set up a plurality of policies to limit the use of the colored heavy metal ions such as lead, cobalt and the like.
For the reasons, the development of a safe and environment-friendly preparation method of the hollow colorful heat-insulating filler with heat dissipation performance is the key point of research.
Disclosure of Invention
The invention aims to provide a preparation method of a hollow colorful heat-insulating filler with heat dissipation performance, which can be used for preparing the colorful heat-insulating filler with high reflectivity and good heat-insulating effect.
According to the technical scheme, the method for preparing the hollow colorful heat-insulating filler with heat dissipation performance is characterized in that the principle that metal nitrate can precipitate under an alkaline condition is utilized, so that precipitates are accumulated on the surface of hollow glass beads, and a layer of compact nonferrous metal surface film is formed through calcination, so that the hollow colorful heat-insulating filler with heat dissipation performance is prepared.
The method comprises the following steps:
(1) preparation of the filler: taking hollow glass beads, adding a mixed solution of water and ethanol, adding a surfactant, carrying out ultrasonic stirring reaction, and then carrying out centrifugation and vacuum drying to obtain modified hollow glass beads; adding deionized water and a metal nitrate solution into the modified hollow glass beads, adjusting the pH value of a solvent, and reacting under high-speed stirring; repeatedly filtering, washing and drying the obtained product; putting the product in a muffle furnace for high-temperature calcination to obtain the hollow colorful heat-insulating filler;
(2) modification: adding a sodium acetate aqueous solution into the hollow colorful heat-insulating filler prepared in the step (1), and stirring; preparing a heat dissipation filler into heat dissipation filler slurry, adding the heat dissipation filler slurry into a sodium acetate aqueous solution of a hollow colorful heat insulation filler, and reacting under ultrasonic stirring; and finally, repeatedly filtering, washing and drying to obtain the hollow colorful heat-insulating filler with heat dissipation performance.
The surfactant in the step (1) is an aqueous solution of sodium hexametaphosphate, sodium silicate or sodium aluminate.
The metal nitrate in the step (1) is Cu (NO)3)2·5H2O or Fe (NO)3)3·3H2O。
And (3) the heat dissipation filler in the step (2) is boron nitride, aluminum nitride, boron oxide or graphene.
The pH value regulator in the step (1) is ammonia water or sodium hydroxide.
The method comprises the following specific steps:
(1) preparing hollow colorful heat-insulating filler:
a. 20-30g of hollow glass microspheres with the diameter of 1-2 mu m are taken and added into a beaker, 120mL of mixed solution of water and ethanol with the volume of 100-; centrifuging at 600r/min for 10-15min at 400-;
b. adding 10-20g of the hollow glass microspheres obtained by modification in the step a into a three-neck flask inserted with a stirring rod, adding 100-120mL of deionized water, and adding 8-10g of Cu (NO) in batches3)2·5H2Adjusting the pH value of the reaction solution to 6-8 by using a sodium hydroxide solution with the mass concentration of 10-30%, and finally reacting for 5-7h at the rotating speed of 400-600 r/min;
c. filtering and washing the product for 2-4 times, drying at 50-70 deg.C for 24-30h, and standing;
d. calcining the product in a muffle furnace at the temperature of 500-800 ℃ for 4-6h to obtain the hollow colorful heat-insulating filler;
(2) modification:
e. putting 15-20g of the hollow colorful heat-insulating filler prepared in the step (1) into a beaker, adding 2-5g of sodium acetate aqueous solution with the mass concentration of 10% -30%, and stirring for later use;
f. taking 1g of heat dissipation filler, adding 50-60g of deionized water, and stirring for 4-6h at 500-600r/min to prepare slurry;
g. adding the slurry obtained in the step f into the beaker material obtained in the step e, and reacting for 24-30 h;
h. filtering and washing for 2-4 times, and drying for 24-30h at 50-70 ℃ to obtain the hollow colorful heat-insulating filler with heat dissipation performance.
The heat dissipation filler in the step (2) f is specifically boron nitride, aluminum oxide or graphene.
The invention has the beneficial effects that: the colorful hollow filler prepared by the invention has high reflectivity and good heat insulation effect. The product of the invention is mainly applied to wires and outdoor electronic components, after a certain amount of heat dissipation filler is mixed, the heat dissipation performance of the coating can be directly enhanced, so that a dual heat dissipation mode that the surface coating is mainly in a reflection heat insulation mode when the electronic components work in the daytime and the surface coating is mainly in a heat dissipation mode when the electronic components work at night is realized, and the product has good industrial application prospect.
Drawings
The insulating properties of the filler of figure 1 change over time.
Figure 2 effect of different mass fractions of sodium acetate on filler reflectivity.
Detailed Description
Example 1
(1) Preparation of the filler: firstly, adding 25g of hollow glass beads (1-2 microns) into a beaker, adding 100 mL of mixed solution (9: 1) of water and ethanol, adding 2g of sodium hexametaphosphate, placing the beaker on an ultrasonic machine for ultrasonic stirring for 24 hours, centrifuging after ultrasonic stirring, drying in vacuum, and placing a drying oven for later use. In the second step, 20g of the modified hollow glass microspheres are added into a three-neck flask inserted with a stirring rod, 100 mL of deionized water is added, and 9g of Cu (NO) is added in 3 batches3)2·5H2And (3) adjusting the pH value of the O solution (the mass fraction is 20%) to 7 by using sodium hydroxide, and finally reacting for 5 hours at the rotating speed of 600 r/min. And thirdly, filtering and washing the product for three times, drying and standing for later use. And fourthly, calcining the product in a muffle furnace at 600 ℃ for 4 hours to obtain the hollow colorful heat-insulating filler.
(2) Modification: putting 20g of hollow colorful heat-insulating filler into a beaker, adding 2g of sodium acetate aqueous solution with the mass concentration of 10% -25%, taking 1g of heat-radiating filler alumina to prepare slurry, adding the slurry into the beaker under ultrasonic stirring, reacting for 24h, finally filtering and washing for three times, and performing vacuum drying to obtain the hollow colorful heat-insulating filler with heat radiation performance.
Application examples
The preparation of the heat insulation coating is respectively carried out by adopting the polyurethane emulsion, the hollow colorful heat insulation filler prepared in the step (1) in the example 1 and the hollow colorful heat insulation filler with heat dissipation performance prepared in the step (2), and the change of the heat insulation performance of the filler along with time is subjected to data detection, and the test result is shown in fig. 1.
In the figure, a curve 1 (WPU) is a polyurethane coating formed by curing a common polyurethane emulsion under the irradiation of ultraviolet light; a curve 3 (OI-3) is a heat-insulating coating prepared by blending the polyurethane emulsion, the hollow colorful heat-insulating filler prepared in the step (1), a curing agent 1173 and other auxiliaries; and 2 (IO-3) is a polyurethane emulsion, the hollow colorful heat-insulating filler with heat dissipation performance prepared in the step 2, a curing agent 1173 and other additives are blended to prepare the heat-insulating coating with heat dissipation performance.
As can be seen from fig. 1, the thermal insulation performance of all 3 types of fillers is improved correspondingly with the increase of time, and the curve 2 represented by the filler of the invention has better thermal insulation effect than others.
Application example 2
By adopting the preparation method of the embodiment 1, the concentrations of the sodium acetate aqueous solutions respectively added in the modification of the step (2) are 10%, 15%, 20% and 25% in sequence, the reflectivity of the prepared hollow colorful heat-insulating filler is tested, and the influence of sodium acetate with different mass fractions on the reflectivity of the filler is shown in fig. 2.
As can be seen from fig. 2, the filler has a higher average reflectance, and as the mass fraction of sodium acetate increases, the average reflectance of the filler also increases.
Claims (8)
1. A preparation method of a hollow colorful heat insulation filler with heat dissipation performance is characterized by comprising the following steps: by utilizing the principle that metal nitrate can precipitate under the alkaline condition, the precipitate is accumulated on the surface of the hollow glass microsphere, and a layer of compact non-ferrous metal surface film is formed through the calcination effect, so that the hollow colorful heat-insulating filler with heat dissipation performance is prepared.
2. The preparation method of the hollow multicolor heat insulation filler with heat dissipation performance as claimed in claim 1, characterized by comprising the following steps:
(1) preparation of the filler: taking hollow glass beads, adding a mixed solution of water and ethanol, adding a surfactant, carrying out ultrasonic stirring reaction, and then carrying out centrifugation and vacuum drying to obtain modified hollow glass beads; adding deionized water and a metal nitrate solution into the modified hollow glass beads, adjusting the pH value of a solvent, and reacting under high-speed stirring; repeatedly filtering, washing and drying the obtained product; putting the product in a muffle furnace for high-temperature calcination to obtain the hollow colorful heat-insulating filler;
(2) modification: adding a sodium acetate aqueous solution into the hollow colorful heat-insulating filler prepared in the step (1), and stirring; preparing a heat dissipation filler into heat dissipation filler slurry, adding the heat dissipation filler slurry into a sodium acetate aqueous solution of a hollow colorful heat insulation filler, and reacting under ultrasonic stirring; and finally, repeatedly filtering, washing and drying to obtain the hollow colorful heat-insulating filler with heat dissipation performance.
3. The preparation method of the hollow multicolor heat insulation filler with heat dissipation performance as claimed in claim 2, wherein the preparation method comprises the following steps: the surfactant in the step (1) is an aqueous solution of sodium hexametaphosphate, sodium silicate or sodium aluminate.
4. The preparation method of the hollow multicolor heat insulation filler with heat dissipation performance as claimed in claim 2, wherein the preparation method comprises the following steps: the metal nitrate in the step (1) is Cu (NO)3)2·5H2O or Fe (NO)3)3·3H2O。
5. The preparation method of the hollow multicolor heat insulation filler with heat dissipation performance as claimed in claim 2, wherein the preparation method comprises the following steps: and (3) the heat dissipation filler in the step (2) is boron nitride, aluminum nitride, boron oxide or graphene.
6. The preparation method of the hollow multicolor heat insulation filler with heat dissipation performance as claimed in claim 2, wherein the preparation method comprises the following steps: the pH value regulator in the step (1) is ammonia water or sodium hydroxide.
7. The preparation method of the hollow multicolor heat insulation filler with heat dissipation performance as claimed in claim 2, is characterized by comprising the following steps:
(1) preparing hollow colorful heat-insulating filler:
a. 20-30g of hollow glass microspheres with the diameter of 1-2 mu m are taken and added into a beaker, 120mL of mixed solution of water and ethanol with the volume of 100-; centrifuging at 600r/min for 10-15min at 400-;
b. adding 10-20g of the hollow glass microspheres obtained by modification in the step a into a three-neck flask inserted with a stirring rod, adding 100-120mL of deionized water, and adding 8-10g of Cu (NO) in batches3)2·5H2Adjusting the pH value of the reaction solution to 6-8 by using a sodium hydroxide solution with the mass concentration of 10-30%, and finally reacting for 5-7h at the rotating speed of 400-600 r/min;
c. filtering and washing the product for 2-4 times, drying at 50-70 deg.C for 24-30h, and standing;
d. calcining the product in a muffle furnace at the temperature of 500-800 ℃ for 4-6h to obtain the hollow colorful heat-insulating filler;
(2) modification:
e. putting 15-20g of the hollow colorful heat-insulating filler prepared in the step (1) into a beaker, adding 2-5g of sodium acetate aqueous solution with the mass concentration of 10% -30%, and stirring for later use;
f. taking 1g of heat dissipation filler, adding 50-60g of deionized water, and stirring for 4-6h at 500-600r/min to prepare slurry;
g. adding the slurry obtained in the step f into the beaker material obtained in the step e, and reacting for 24-30 h;
h. filtering and washing for 2-4 times, and drying for 24-30h at 50-70 ℃ to obtain the hollow colorful heat-insulating filler with heat dissipation performance.
8. The method for preparing the hollow multicolor heat insulation filler with heat dissipation performance as recited in claim 7, wherein the method comprises the following steps: the heat dissipation filler in the step (2) f is specifically boron nitride, aluminum oxide or graphene.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112679138A (en) * | 2021-01-27 | 2021-04-20 | 上海无想新材料科技有限公司 | Color sand heat insulation plate and preparation method and application thereof |
| CN112759985A (en) * | 2021-01-27 | 2021-05-07 | 上海无想新材料科技有限公司 | Colored sand coating and preparation method and application thereof |
| CN116218315A (en) * | 2023-04-10 | 2023-06-06 | 常州烯聚新材料科技有限公司 | Long-acting visible-near infrared graphene-based black high-reflectivity coating and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112679138A (en) * | 2021-01-27 | 2021-04-20 | 上海无想新材料科技有限公司 | Color sand heat insulation plate and preparation method and application thereof |
| CN112759985A (en) * | 2021-01-27 | 2021-05-07 | 上海无想新材料科技有限公司 | Colored sand coating and preparation method and application thereof |
| CN116218315A (en) * | 2023-04-10 | 2023-06-06 | 常州烯聚新材料科技有限公司 | Long-acting visible-near infrared graphene-based black high-reflectivity coating and preparation method thereof |
| CN116218315B (en) * | 2023-04-10 | 2024-02-06 | 常州烯聚新材料科技有限公司 | Long-acting visible-near infrared graphene-based black high-reflectivity coating and preparation method thereof |
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