TWI445684B - Composite nanopowders with near infrared reflective property, method of producing the same and application thereof - Google Patents

Description

Composite nanometer powder with near-infrared light reflectivity, and its manufacturing method and application

The present invention relates to a composite nanopowder and a method for producing the same, and more particularly to a composite nanopowder having near-infrared light reflectivity and a method for producing the same.

In general, white (light) color clothing has the effect of reflecting sunlight, black (dark) color clothing absorbs sunlight, and transmitted near-infrared (NIR) light also causes the body temperature to rise. Therefore, in the summer, dark clothes can not achieve the effect of cooling and cooling. Although foreign fabrics with both dark and near-infrared light reflectivity have been developed, their composition is still unknown.

At present, the outdoor thermal insulation coatings commonly used in the construction industry are mostly white and have near-infrared light-reflecting powders, such as titanium dioxide, etc., thereby achieving the purpose of energy saving and cooling of buildings. Since the powder used for outdoor thermal insulation coatings is usually white, other colored components need to be added if the powder is to be used in the manufacture of dark clothing. However, when two different powders are added to a polymer film or fiber, defects such as uneven color distribution are likely to occur.

In view of the above, there is a need to provide a composite nanopowder and a method of manufacturing the same, thereby improving the above-mentioned disadvantages of conventionally producing both dark and near-infrared light reflective garments.

Therefore, one aspect of the present invention provides a method for producing a composite nano-powder having near-infrared light reflectivity, which is a dark-color and near-infrared light obtained by using a sol-gel process to form zinc oxide and copper oxide. Reflective copper-zinc oxide composite nanopowder.

Another aspect of the present invention provides a composite nanopowder obtained by the above method, which is a copper-zinc oxide composite nanopowder having both dark and near-infrared light reflectivity.

Still another aspect of the present invention provides a composite film in which the copper-zinc oxide composite nanopowder is distributed in a polymer film to provide both a dark color and a near-infrared light reflectance.

In still another aspect of the present invention, a fabric having near-infrared light reflectivity is provided, wherein at least one surface of the fabric has the composite film, such that the fabric has both dark and near-infrared light reflectivity.

Still another aspect of the present invention is to provide a composite fiber having near-infrared light reflectivity, wherein the copper-zinc oxide composite nano-powder is distributed in a polymer fiber, so that the composite fiber has both a dark color and a near color. Infrared light reflectivity.

Still another aspect of the present invention is to provide a fabric having near-infrared light reflectivity which is obtained by using the above composite fiber to impart both dark and near-infrared light reflectivity to the fabric.

According to the above aspect of the invention, a method for producing a composite nano-powder having near-infrared light reflectivity is proposed. In one embodiment, the method includes providing a composite metal salt aqueous solution, wherein the aqueous mixed metal salt solution is a composite metal nitrate aqueous solution and comprises a dimetal ion including copper ions (A-1) and zinc ions (A -2), and the molar ratio of copper ion (A-1) to zinc ion (A-2) is 2:1 to 1:19. Next, the organic acid aqueous solution (B) is added to the aforementioned composite metal salt aqueous solution to make the composite metal salt aqueous solution and the organic The aqueous acid solution reacts to form a sol-gel material in which the sol-gel material has a uniformly dispersed copper-zinc oxide. Then, calcination treatment is performed at 400 ° C to 800 ° C to form the aforementioned sol-gel material into a copper-zinc oxide composite nano-powder, wherein each of the copper-zinc oxide composite nano-powders is composed of copper oxide. It is composed of two crystal phases of zinc oxide, the molar ratio of copper to zinc is 2:1 to 1:19, and the reflectance of copper-zinc oxide composite nanopowder for near-infrared light is 60% to 90%.

According to an embodiment of the present invention, the above organic acid aqueous solution (B) further comprises citric acid or polyacrylic acid.

According to an embodiment of the present invention, the calcination treatment described above can be carried out for 1 hour to 4 hours.

According to another aspect of the present invention, a composite nanopowder having near-infrared light reflectivity is proposed which is obtained by the above method.

According to still another aspect of the present invention, a composite film having near-infrared light reflectivity is provided, which has a copper-zinc oxide composite nanopowder having a uniform distribution of 5.0 to 30.0% by weight in a polymer material.

According to still another aspect of the present invention, a fabric having near-infrared light reflectivity is proposed, wherein at least one surface of the fabric has the above-described composite film having near-infrared light reflectivity.

According to still another aspect of the present invention, a composite fiber having near-infrared light reflectivity is provided, wherein the composite fiber has 5.0 to 30.0% by weight of the copper-zinc oxide composite nanometer powder distributed on the polymer fiber in.

According to still another aspect of the present invention, a fabric having near-infrared light reflectivity is proposed, wherein the fabric is produced by using the above-described composite fiber having near-infrared light reflectivity.

The composite nano-powder of the present invention and a method for producing the same, which are prepared by using a sol-gel process to form a copper-zinc oxide composite nano-powder having both dark and near-infrared light reflectance, which can be uniformly dispersed in a polymer Among the materials, it is further applied to the manufacture of functional composite fibers, composite films and fabrics which have both dark and near-infrared light reflectivity.

As described above, the present invention provides a composite nano-powder having near-infrared light reflectivity and a method for producing the same, which utilizes a sol-gel process to form zinc oxide and copper oxide to have both dark and near-infrared light reflectivity. Copper-zinc oxide composite nano powder.

In the present invention, the "copper-zinc oxide composite nanopowder" referred to herein is characterized in that each crystal grain is composed of two crystal phases of copper oxide and zinc oxide, wherein each crystal grain The molar ratio of copper to zinc is from 2:1 to 1:19. It should be noted that the copper-zinc oxide composite nano-powder is synthesized through a chemical reaction, and is not simply a physical mixed copper oxide and zinc oxide, so that the copper oxide portion of each crystal grain can provide dark and near-infrared light. The reflective property, while the zinc oxide portion can barely reflect the near-infrared light, so that each of the obtained copper-zinc oxide composite nano-powder has both dark and near-infrared light reflectivity. For example, the composite nano-powder obtained by the present invention has a reflectance of near-infrared light of 60% to 90%.

If the copper-zinc oxide composite nanopowder has a molar ratio of copper to zinc of less than 2:1 or greater than 1:19, the copper-zinc oxide composite nanopowder cannot have both dark colors and Near infrared light reflectivity.

Next, the composite nano-powder obtained by the present invention can be directly added to a polymer film or fiber, has good dispersibility, and can be added in a large amount. In one example, up to 5.0% by weight to 30.0% by weight of copper-zinc oxide composite nanopowder may be added to the polymer film or fiber.

Here, the simple mixing of copper oxide and zinc oxide by a conventional physical pulverization method, a mechanical ball milling method, or the like, although a nano-mixed powder having a composition of copper oxide and zinc oxide and having a nanometer size can be obtained, However, any one of ordinary skill in the art to which the present invention pertains should be well-known. If the two different crystal phases of zinc oxide and copper oxide nano-mixed powder are simply physically mixed, then there are two different crystal phases. When the rice mixed powder is added to a polymer film or fiber, defects such as uneven color distribution tend to occur.

The copper-zinc oxide composite nano-powder obtained by the invention has the small particle size and can be further applied to manufacture a composite film, wherein the polymer film can be added with a copper-zinc oxide composite of up to 5.0% by weight to 30.0% by weight. Nano powder. The obtained composite film can be disposed on at least one surface of the fabric to impart near-infrared light reflectivity and dark color to the fabric.

In addition, the copper-zinc oxide composite nano-powder obtained by the above invention can be further applied to manufacture composite fibers, wherein up to 5.0% by weight to 30.0% by weight of copper-zinc oxide composite nano-powder can be added to the polymer fiber. . The resulting composite fiber can be made into a fabric to impart near-infrared light reflectivity and dark color to the fabric.

Method for producing copper-zinc oxide composite nanometer powder

The copper-zinc oxide composite nanopowder system of the present invention is obtained by a sol-gel process, which will be described below.

In a further embodiment, the method comprises providing a composite metal salt aqueous solution (A), wherein the composite metal salt aqueous solution (A) can be, for example, a composite metal nitrate aqueous solution. In an example, the composite metal salt aqueous solution (A) contains two kinds of metal ions such as copper ions (A-1) and zinc ions (A-2), and copper ions (A-1) and zinc ions (A- 2) The molar ratio is from 2:1 to 1:19, but preferably from 2:1 to 1:4.

Next, the organic acid aqueous solution (B) is added to the above-mentioned composite metal salt aqueous solution (A) to react the composite metal salt aqueous solution (A) with the organic acid aqueous solution (B) to form a sol-gel material.

In one embodiment, the aforementioned aqueous organic acid solution (B) may include, but is not limited to, citric acid, polyacrylic acid, oxalic acid or succinic acid, with citric acid or polyacrylic acid being preferred.

In an exemplary embodiment, an aqueous polyacrylic acid solution is added to the above-mentioned composite metal salt aqueous solution (A), and the polyacrylic acid chelates the metal ions to form a sol-gel material, as shown by the reaction of the following formula (I), wherein M ⁺² represents a divalent metal ion, and -COOH represents an organic acid. The degree of polymerization (n) of a suitable polyacrylic acid may be, for example, from 2,000 to 3,000, and its viscosity may be, for example, from 8,000 cp to 12,000 cp. When the reaction of the formula (I) is carried out, the molar ratio of the polyacrylic acid to the total metal ion is 2:1.

2(-COOH)+M ⁺² →(-COO-M-OOC-)+2H ⁺ (I)

In another example, an aqueous citric acid solution may be added to the aqueous solution of the composite metal salt described above, and the citric acid will chelate the metal ions to form a sol-gel material, as shown by the reaction of the above formula (I). The sol-gel material obtained above can reach a nano-dispersed copper-zinc oxide.

Then, the calcination treatment is performed to form the sol-gel material to form a copper-zinc oxide composite nanometer powder, wherein each of the copper-zinc oxide composite nanometer powders is composed of two crystals of copper oxide and zinc oxide. The phases are composed, and the molar ratio of copper to zinc per crystal is from 2:1 to 1:19. Further, the obtained copper-zinc oxide composite nano-powder has an average secondary particle diameter of 20 nm to 500 nm, which can be further refined into a desired particle diameter by a conventional polishing process depending on actual needs. In one embodiment, the resulting copper-zinc oxide composite nanopowder has a reflectance of from about 60% to about 90% for near-infrared light.

The following examples are provided to illustrate the application of the present invention, and are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention.

Preparation of copper-zinc oxide composite nanometer powder

Example 1

First, a composite metal nitrate aqueous solution (A) is prepared, wherein copper nitrate (Cu(NO ₃ ) ₂ ‧2.5H ₂ O; Sigma-Aldrich Co. LLC; A-1-1) is 0.08 millimolar (mmole), Zinc nitrate (Zn(NO ₃ ) ₂ ‧H ₂ O; JT Baker Co.; A-2-1) was 0.04 mmole.

Next, a polyacrylic acid (PAA, [C ₂ H ₃ COOH] n, a degree of polymerization (n) of 2000 to 3000, a viscosity of 8000 cp to 12000 cp (25 ° C); Showa Industry; B-1-1) The solution is added to the aqueous solution of the composite metal salt to form a sol-gel material, wherein the aqueous solution of the composite metal nitrate solution (A) and the total volume of the polyacrylic acid aqueous solution (B-1-1) is 200 mL, [polyacrylic acid aqueous solution ( B-1-1)]/[The total metal ion (i.e., [Cu ²⁺ ]+[Zn ²⁺ ]) has a molar ratio of 2/1 (gram equivalent ratio of 1:1).

After the above sol-gel material is dried by heating at 70 ° C to obtain a dry glue, an appropriate amount of dry glue is heated at a heating rate of 2 ° C / min to 400 ° C, 600 and 800 ° C, respectively, and calcination treatment is carried out for 2 hours. Copper-zinc oxide composite nanometer powder, wherein each crystal grain of copper-zinc oxide composite nanometer powder is composed of two crystal phases of copper oxide and zinc oxide, and copper and zinc of each crystal grain The ear ratio is 2:1. Thereafter, the type, particle size, crystal phase composition, and thermal reaction of the obtained copper-zinc oxide composite nanopowder are examined, and the detection method thereof will be described later.

Examples 2 to 7

The method for producing the copper-zinc oxide composite nanopowder of the first embodiment is different in the examples 2 to 9 to change the kind of the raw material, the amount of use, and the conditions of the calcination treatment, and the formulation and the calcination treatment are as shown in the first table. .

Comparative example

The method for producing the copper-zinc oxide composite nanopowder of the first embodiment is different from the comparative example 1 to the comparative example 2 in changing the kind of the raw material, the amount of use, and the conditions of the calcination treatment, and the formulation and the calcination treatment are as shown in the first table. Shown.

Evaluation of the effectiveness of copper-zinc oxide composite nanopowders

The copper-zinc oxide composite nanopowder prepared as described above can be used to detect its thermal analysis reaction, crystal phase composition, type and particle size, and appearance color, etc., by a conventional method.

Thermal analysis map

Please refer to FIGS. 1A to 1F for thermal analysis of the copper-zinc oxide composite nanopowders of Examples 1 to 4 and Comparative Examples 1 to 2. The horizontal axis of Fig. 1A to Fig. 1F is temperature (°C), the left vertical axis is heat flow (μV), the right vertical axis is weight loss rate (%), curve 101a, curve 103a, curve 105a, curve 107a, curve 109a Curve 111a represents the heat flow curve of the powder, and curve 101b, curve 103b, curve 105b, curve 107b, curve 109b, and curve 111b represent the weight loss rate of the powder.

From the results of the heat flow (μV) of FIGS. 1A to 1E, it is understood that the copper-zinc oxide composite nanopowders of Examples 1 to 4 and the copper oxide nanopowder of Comparative Example 1 have an exothermic peak at 300 ° C. Between 400 ° C. From the results of the heat flow (μV) in Fig. 1F, the exothermic peak of the zinc oxide nanopowder of Comparative Example 2 was postponed to between 400 ° C and 500 ° C.

For similar results, please refer to FIG. 3, which is a thermal analysis diagram of the copper-zinc oxide composite nanopowder of Example 5. The horizontal axis of Fig. 3 is the temperature (°C), the left vertical axis is the heat flow (μV), the right vertical axis is the weight loss rate (%), the curve 301a represents the heat flow curve of the powder, and the curve 301b represents the weight loss of the powder. rate.

From the results of the heat flow (μV) in FIG. 3, the exothermic peak of the copper-zinc oxide composite nanopowder synthesized from the citric acid gel in Example 5 was also between 300 ° C and 400 ° C, and Example 1 to the implementation. Example 4 The results of the copper-zinc oxide composite nanopowder synthesized from the polyacrylic acid gel (i.e., Fig. 1A to Fig. 1D) were similar.

2 Crystal phase composition

This embodiment utilizes a conventional X-ray diffraction (XRD) apparatus such as an X-ray diffractometer (Model No. Rigaku D/max-III B, Shimadzu Co., Tokyo). Japan), 2θ scan analysis of the copper-zinc oxide composite nanopowder of the example was carried out.

Please refer to FIGS. 2A to 2F , which respectively show XRD patterns of Examples 1 to 4 and Comparative Examples 1 to 2 at different calcination temperatures. The horizontal axis of FIGS. 2A to 2F is the scanning angle (2θ°), and the vertical axis is the intensity (counts per second, cps), curve 201a, curve 203a, curve 205a, curve 207a, curve 209a, The curve 211a represents an XRD pattern of the above powder calcined at a temperature of 400 ° C for 2 hours, and the curve 201b, the curve 203b, the curve 205b, the curve 207b, the curve 209b, and the curve 211b represent the XRD pattern of the above powder calcined at 600 ° C for 2 hours, and the curve 201c, curve 203c, curve 205c, curve 207c, curve 209c, and curve 211c represent XRD patterns of the above powder calcined at 800 ° C for 2 hours. The figure number ★ represents the peak diffraction intensity of copper oxide, and the figure number ▼ represents the peak of the diffraction intensity of zinc oxide.

From the XRD pattern results of FIGS. 2A to 2D, it is understood that the copper-zinc oxide composite nanopowders of Examples 1 to 4 have both crystal phases of copper oxide and zinc oxide, and as the calcination temperature is increased, The better the crystal phase, the higher the diffraction intensity. However, when the calcination temperature exceeds 800 ° C or more, the diffraction intensity tends to gradually decrease. In contrast, the copper oxide composite nanopowder of Comparative Example 1 and the zinc oxide composite nanopowder of Comparative Example 2 continued to increase in diffraction intensity as the calcination temperature was increased even above 800 ° C, as shown in FIG. 2E. As shown in Figure 2F.

For similar results, please refer to Fig. 4, which is an XRD pattern of the copper-zinc oxide composite nanopowder of Example 5. The horizontal axis of Fig. 4 is the scanning angle (2θ°), the vertical axis is the intensity (counts per second, cps), the right vertical axis is the weight loss rate (%), curve 401a, curve 401b, curve 401c Curve 401d and curve 401e represent XRD patterns of the above powder calcined at 600 ° C, 700 ° C, 800 ° C, 900 ° C and 1000 ° C for 4 hours.

It can be seen from the XRD pattern of FIG. 4 that the copper-zinc oxide composite nanopowder synthesized from the citric acid gel of Example 5 has both crystal phases of copper oxide and zinc oxide, and crystallizes as the calcination temperature increases. The better the phase, the higher the diffraction intensity. However, when the calcination temperature exceeds 800 ° C or more, the diffraction intensity tends to be slightly weakened, and the copper-zinc oxide composite nanopowder synthesized from the polyacrylic acid gel of Examples 1 to 4 (ie, The XRD patterns of 2A to 2D are similar.

3. Type and particle size

In this embodiment, TEM analysis of the copper-zinc oxide composite nanopowder of the examples was carried out by using a conventional transmission electron microscope (TEM) such as Hitachi H-7500 TEM.

Please refer to FIG. 5A to FIG. 5C , which are diagrams showing electrical appearance of copper-zinc oxide composite nano-powder according to an embodiment of the present invention, which is subjected to calcination treatment at 600 ° C for 2 hours. An electrographic photograph of the obtained copper-zinc oxide composite nanopowder. From the electrographic photographs of Figs. 5A to 5C, it is understood that the average secondary particle diameter of the copper-zinc oxide composite nanopowder of Example 4 after calcination treatment is from about 20 nm to about 500 nm.

4. Appearance color

The nanopowders obtained in Examples 1 to 7 and Comparative Examples 1 to 2 were visually judged for their appearance color, and evaluated according to the following criteria. The results are shown in Table 1:

◎: gray black

○: Dark brown

△: dark gray

╳: Near white (including beige, grayish white)

Preparation of polymer composite film

This embodiment is an epoxy resin (AB glue; Epoxy resin 1010; viscosity 11000 cps to 15000 cps (25 ° C); Douyuan Chemical Co., Ltd.) as a matrix of the polymer composite film, adding 10 weight percent (wt%) of the foregoing The copper-zinc oxide composite nanopowders prepared in Examples 1 to 7 and Comparative Examples 1 to 2 were used to further evaluate the effectiveness of the copper-zinc oxide composite nanopowder.

First, 0.06 g of the copper-zinc oxide composite nanopowder prepared in the above Examples 1 to 7 and Comparative Examples 1 to 2 was taken, and 0.06 g of ethanol (Shimajiro Pharmaceutical Co., Ltd.) was added thereto, and the mixture was stirred for a while, and then dispersed. Add 0.27 g of A gum (bisphenol A; bisphenol A) and mix well. After the ethanol was volatilized, 0.27 g of B-gel (epichlorohydrin) was added and stirred and mixed well.

The uniformly mixed resin is uniformly applied to a substrate (for example, a PET transparent sheet having a thickness of 100 μm) in a volume of 300 μL, 150 μL or 100 μL, and the coated area may be, for example, 2 cm × 3 cm. After the resin was allowed to stand for one day, a polymer composite film containing 10% by weight (wt%) of copper-zinc oxide composite nanopowder was obtained. At least 2 polymer composite films were prepared for each condition of the powder, and each of the polymer composite films was measured by a screw micrometer (Screw Thread Micrometer, Mitutoyo Co., accuracy 0.01 mm) for measuring the polymer composite film. The thickness is about 220 μm (excluding the thickness of the PET transparent sheet).

Evaluate the effectiveness of polymer composite films

The above-mentioned polymer composite film can be obtained by a conventional UV/VIS/NIR spectrophotometer, such as a UV/VIS/NIR spectrometer (V-570, JASCO International Co. Ltd., Tokyo). , Japan), the near-infrared light reflection spectrum of the polymer composite film prepared as described above was examined and evaluated according to the following criteria. The results are shown in Table 1, Figure 6 to Figure 7:

◎: 80% ≦NIR reflectance

○: 70% ≦NIR reflectance <80%

△: 60% ≦NIR reflectance <70%

╳: NIR reflectance <60%

Please refer to FIG. 6 , which illustrates UV/VIS/NIR spectra of copper-zinc oxide composite nanopowders according to several embodiments of the present invention, which are held at 600 ° C for Examples 1 to 4. The UV/VIS/NIR spectrum of the copper-zinc oxide composite nanopowder obtained after the hourly calcination treatment. The horizontal axis of Fig. 6 is the wavelength (nm), and the vertical axis is the reflectance (%) intensity (the reflectance of the polymer film without the composite nano-powder is 100%), the curve 601, the curve 603, the curve 605, Curve 607 represents the UV/VIS/NIR spectrum of the copper-zinc oxide composite nanopowder obtained in Examples 1 to 4, respectively, calcined at 600 ° C for 2 hours. In Fig. 6, the wavelength below 700 nm is a visible light (VIS) spectral region, and the wavelength above 700 nm is a near-infrared (NIR) spectral region.

From the UV/VIS/NIR spectral analysis of Fig. 6 and the first table, it is understood that the more zinc contained in the copper-zinc oxide composite nanopowder, the better the reflectance of near-infrared light.

For similar results, please refer to FIGS. 7A to 7D, which respectively illustrate the UV/VIS/NIR spectra of the copper-zinc oxide composite nanopowders of Examples 1 to 4 after calcination at different temperatures. The horizontal axis of Fig. 6 is the wavelength (nm), and the vertical axis is the reflectance (%) intensity (the reflectance of the polymer film without the composite nano-powder is 100%), the curve 701a, the curve 701b, the curve 701c, Curve 701d represents the UV/VIS/NIR spectrum of the copper-zinc oxide composite nanopowder obtained in Examples 1 to 4, respectively, calcined at 400 ° C for 2 hours; curve 703a, curve 703b, curve 703c, curve 703d respectively represent implementation The copper-zinc oxide composite nanopowders obtained in Examples 1 to 4 were calcined at 600 ° C for 2 hours in UV/VIS/NIR spectrum; curve 705a, curve 705b, curve 705c, and curve 705d represent Examples 1 to Examples, respectively. 4 The obtained copper-zinc oxide composite nanopowder was calcined at 800 ° C for 2 hours in UV/VIS/NIR spectrum. In FIGS. 7A to 7D, only the results of visible light (VIS) spectral region analysis of a wavelength of 800 nm or more are shown.

From the UV/VIS/NIR spectral analysis of Figures 7A to 7D, it is known that the higher the calcination temperature of the copper-zinc oxide composite nanopowder, the better the reflectance of near-infrared light, wherein the copper of Example 4 - The zinc oxide composite nanopowder can achieve 80% reflectance when calcined at 600 ° C, and the copper-zinc oxide composite nanopowders of Examples 1 to 4 can also achieve 80% refraction at 800 ° C. rate.

In summary, the present invention utilizes a sol-gel process to produce a copper-zinc oxide composite nanopowder having both dark and near-infrared light reflectivity, which has a small particle size and can be dispersed in a polymer material. It is also used in the manufacture of textiles such as functional composite fibers, composite films and fabrics.

In one embodiment, the copper-zinc oxide composite nano-powder obtained above may be uniformly distributed in the polymer material in an amount of from 5.0% by weight to 30.0% by weight to obtain both dark and near-infrared light reflectivity. The composite film or the fabric containing the same thereby imparting near-infrared light reflectivity and dark color to the fabric.

In another embodiment, the copper-zinc oxide composite nano-powder obtained above may be uniformly distributed in the polymer fiber in an amount of from 5.0% by weight to 30.0% by weight to obtain both dark and near-infrared light reflection. A composite fiber or a fabric made therefrom, thereby imparting near-infrared light reflectance and dark color to the fabric.

However, it should be noted that the present invention describes a composite nano-nanoparticle having near-infrared light reflectivity and its manufacture by using a specific process, a specific analysis method, a specific test, a specific reaction condition or a specific device as an example. However, it is to be understood by those skilled in the art that the present invention is not limited thereto, and the composite nano-nano powder having near-infrared light reflectivity of the present invention and the present invention and its scope are not deviated from the spirit and scope of the present invention. The manufacturing method can also be carried out using other processes, other analytical methods, other tests, other reaction conditions, or other equipment.

It can be seen from the above embodiments of the present invention that the copper-zinc oxide composite nanometer powder of the present invention and the method for producing the same have the advantages of using a sol-gel process to produce copper-zinc which has both dark and near-infrared light reflectivity. The oxide composite nano-powder can be dispersed in a polymer material and further used to produce functional composite fibers, composite films and fabrics having both dark and near-infrared light reflectivity.

While the invention has been described above in terms of several embodiments, it is not intended to limit the scope of the invention, and the invention may be practiced in various embodiments without departing from the spirit and scope of the invention. The scope of protection of the present invention is defined by the scope of the appended claims.

101a/101b/103a/103b/105a/105b/107a/107b/109a/109b/111a/111b. . . curve

201a/201b/201c/203a/203b/203c/205a/205b/205c/207a/207b/207c/209a/209b/209c/211a/211b/211c. . . curve

301a/301b. . . curve

401a/401b/401c/401d/401e. . . curve

601/603/605/607. . . curve

701a/701b/701c/701d/703b/703c/703d/705a/705b/705c/705d. . . curve

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

1A to 1F are thermal analysis charts of copper-zinc oxide composite nanopowders of Examples 1 to 4 and Comparative Examples 1 to 2, respectively.

2A to 2F are XRD patterns of Examples 1 to 4 and Comparative Examples 1 to 2, respectively, at different calcination temperatures.

Fig. 3 is a graph showing the thermal analysis of the copper-zinc oxide composite nanopowder of Example 5.

Fig. 4 is a view showing the XRD pattern of the copper-zinc oxide composite nanopowder of Example 5.

5A to 5C are diagrams showing electrical appearance of copper-zinc oxide composite nanopowder according to an embodiment of the present invention.

Figure 6 is a graph showing the UV/VIS/NIR spectrum of a copper-zinc oxide composite nanopowder according to several embodiments of the present invention.

7A to 7D are UV/VIS/NIR spectra of the copper-zinc oxide composite nanopowders of Examples 1 to 4 after calcination at different temperatures, respectively.

601/603/605/607. . . curve

Claims (7)

A method for producing a composite nano-nano powder having near-infrared light reflectivity, comprising at least: providing a composite metal salt aqueous solution (A), wherein the composite metal salt aqueous solution (A) is the composite metal nitrate aqueous solution and is composed of a dimetallic ion Composition, the two metal ions are copper ion (A-1) and zinc ion (A-2), and the molar ratio of the copper ion to the zinc ion is from 2:1 to 1:19; (B) adding the composite metal salt aqueous solution (A), reacting the composite metal salt aqueous solution (A) with the organic acid aqueous solution (B) to form a sol-gel material, wherein the organic acid aqueous solution (B) comprises Polyacrylic acid or citric acid having a degree of polymerization (n) of from 2000 to 3000 and a viscosity of from 8000 cp to 12000 cp (25 ° C), and the sol-gel material has uniformly dispersed copper-zinc oxide; Performing a calcination treatment (C) at 400 ° C to 800 ° C to form the sol-gel material to form a copper-zinc oxide composite nano-powder, wherein each of the copper-zinc oxide composite nano-powders is composed of Composed of copper-zinc oxide, the ratio of copper to zinc molar ratio of each grain is 1:4 to 1:9, and the reflectance of the copper-zinc oxide composite nanopowder for near-infrared light is 60% to 90%. The method for producing a composite nano-powder having near-infrared light reflectivity according to claim 1, wherein the calcination treatment (C) is carried out for 1 hour to 4 hours. Composite nanometer powder with near-infrared light reflectivity A copper-zinc oxide composite nanopowder formed by the method according to any one of claims 1 to 2, wherein the molar ratio of copper to zinc of each crystal grain is 1:4 Up to 1:9, and the reflectance of the copper-zinc oxide composite nanopowder for near-infrared light is 60% to 90%. A composite film having near-infrared light reflectivity, which has a copper-zinc oxide composite nano-powder uniformly dispersed in a polymer film and having a thickness of 5.0 to 30.0% by weight - Zinc oxide composite nano powder. A fabric having near-infrared light reflectivity, wherein at least one surface of the fabric has a composite film having near-infrared light reflectivity as described in claim 4 of the patent application. A conjugate fiber having near-infrared light reflectivity, wherein the conjugate fiber has a copper-zinc oxide composite nano-powder uniformly dispersed in a polymer fiber as described in claim 3 And the copper-zinc oxide composite nano powder. A fabric having near-infrared light reflectivity, wherein the fabric is produced by using a composite fiber having near-infrared light reflectivity as described in claim 6 of the patent application.