Method for improving infrared reflection performance of gold coating

Abstract

The invention provides a method for improving the infrared reflection performance of a gold coating, which comprises the following steps: dispersing an iron compound solution into an organic gold coating, and uniformly stirring to obtain an iron-doped organic gold coating; a quartz substrate is coated with the iron-doped organic gold coating, and an iron-doped gold coating is obtained through drying and annealing processes. Iron is doped in the organic gold coating, and the infrared reflection performance of the gold coating is effectively enhanced by utilizing charge transfer and transition of Fe < 3 + > and the influence of the electron structure of Fe < 3 + > on the band gap characteristic of crystals and the size structure of crystal grains. The method is simple in preparation and low in cost, and the iron-doped gold coating prepared through the method is excellent in weather resistance, corrosion resistance and infrared reflection performance and has wide application prospects.

Description

Technical Field

[0001] The invention relates to the field of functional coatings, and in particular to a method for improving the infrared reflection performance of a gold coating. Background Art

[0002] In the field of modern materials science and engineering, gold coatings are widely used in optoelectronics, sensors, aerospace, medical equipment, military equipment and other fields due to their excellent physical and chemical properties. Among them, the excellent electrical conductivity and chemical stability of gold enable it to exhibit excellent performance in various environments. However, with the increasing demand for high-performance materials, how to improve the infrared reflection performance of gold coatings has become an important research topic. The improvement of infrared reflection performance can not only enhance the application value of gold coatings in temperature control, thermal management and other aspects, but also promote its integration and application with other functional materials. For example, in thermal management systems, the infrared reflection performance of gold coatings can effectively reflect infrared radiation, thereby reducing the thermal load of equipment and improving energy efficiency.

[0003] Regarding the research background of infrared reflective performance, a reference (Effects of thin film thickness on emittance, reflectance and transmittance of nano scale multilayers [J]. International journal of physical sciences, 2010, 5 (5).) shows that as the thickness of the coating increases, the reflective ability of gold will continue to increase. This is because a thicker gold layer can make full use of its inherent high reflectivity and effectively block infrared radiation, so that it exhibits excellent reflective performance in a wider wavelength range. When the thickness reaches a certain level, the reflectivity will tend to saturate. However, this strategy to improve the reflectivity increases the raw material cost of the coating, and excessive thickness will cause increased stress in the coating, which may cause the coating to crack or fall off. In addition, the reflectivity can be improved by doping metals with high free electrons such as silver in the gold coating to form alloys or nanocomposites, but silver is a precious metal and also increases the cost of the coating.

[0004] Patent application with publication number US6150039A discloses a method for forming a protective and / or reflectivity-enhancing covering layer on a noble metal. A thin metal adhesive layer is deposited on the noble metal by physical vapor deposition, and then an outer coating is deposited on the thin metal adhesive layer by physical vapor deposition again. The noble metal is preferably gold, or silver or a gold-silver alloy, the thin metal adhesive layer is selected from chromium, titanium, tantalum, nickel, cobalt and alloys thereof, and the outer coating is a low-refractive index and a high-refractive index dielectric coating alternately adhered to the thin metal adhesive layer. This method is relatively complicated to operate and has a relatively high cost. Summary of the invention

[0005] In order to solve the above problems in the prior art, the present invention provides a method for improving the infrared reflection performance of a gold coating, comprising the following steps: dispersing an iron compound solution into an organic gold coating and stirring the mixture evenly to obtain an iron-doped organic gold coating; coating the iron-doped organic gold coating on a quartz substrate, and obtaining an iron-doped gold coating by drying and annealing.

[0006] Preferably, the iron compound in the iron compound solution is selected from one or more of ferric thiocyanate, ferric isooctanoate, ferric chloride hexahydrate and ferric nitrate nonahydrate, providing Fe 3+ ; The solvent of the iron compound solution is selected from one or more of acetone, ethanol, trichloroethane and ether.

[0007] Preferably, the mass proportion of the iron compound in the iron compound solution in the iron-doped organic gold coating is 1.9%-2.9%, and the mass proportion of the solvent in the iron compound solution in the iron-doped organic gold coating is 4.8%-5.7%.

[0008] Preferably, the iron-doped organic gold coating comprises: 23%-29% resin acid gold, 19% resin, 1.9%-3% organic metal additive, and 42%-48% organic solvent. The resin acid gold can be obtained by reacting sulfurized balsam with gold chloride, and the specific reference is made to the patents with publication numbers CN117316491A and CN112735631A.

[0009] Preferably, the resin is selected from one or more of terpene resin, epoxy resin, acrylic resin, alkyd resin and rosin resin.

[0010] Preferably, the organic metal additive is selected from one or more of bismuth isooctanoate, bismuth neodecanoate, chromium isooctanoate, chromium neodecanoate, rhodium isooctanoate, palladium acetylacetonate, yttrium isooctanoate and yttrium neodecanoate. The organic metal additive can improve the wear resistance, corrosion resistance, oxidation resistance and conductivity of the gold coating.

[0011] Preferably, the organic solvent is selected from one or more of terpineol, linalool, camphor oil, turpentine, ethylene glycol monobutyl ether, dibutyl phthalate and trichloroethane.

[0012] Preferably, the uniform stirring method is ultrasound, using an ultrasonic disperser to utilize high-frequency sound waves to generate cavitation in the liquid, thereby effectively dispersing the difficult-to-dissolve particles.

[0013] Preferably, the coating method is a brush coating method or a spray coating method. The brush coating method is to apply the iron-doped organic gold coating on the quartz substrate with a brush, which is simple to operate and suitable for small-area or local coating. The spray coating method is to use a spray gun or a sprayer to spray the iron-doped organic gold coating on the quartz substrate in a mist form, which is suitable for large-area coating.

[0014] Preferably, the drying temperature is 80° C. and the drying time is 10 min; the annealing temperature is 800° C. and the annealing atmosphere is air and the annealing time is 10 min. The drying and annealing furnace heating rate is 10° C. / min.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention provides a method for improving the infrared reflection performance of a gold coating, wherein iron is doped into an organic gold coating, and Fe 3+ The charge transfer transition of Fe 3+ The electronic structure of the gold layer has an influence on the band gap characteristics of the crystal and the size structure of the grains, effectively enhancing the infrared reflection performance of the gold coating. The method is simple to prepare and low in cost. The iron-doped gold coating prepared by the method has excellent weather resistance, corrosion resistance and infrared reflection performance, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The near-infrared reflection spectra of the gold coatings obtained in Comparative Example 1 and Example 1 are shown. DETAILED DESCRIPTION

[0018] Example 1

[0019] 1000 mg of gold resinate (YDAUP002, YRIT) was added to 1000 mg of pine alcohol, and a gold resinate solution was obtained by magnetic stirring. 667 mg of terpene resin was added to 500 mg of pine alcohol, and ultrasonic dispersion was used to form a uniform and stable terpene resin solution.

[0020] The terpene resin solution was added to the resin acid gold solution, and 37 mg of chromium isooctanoate, 43 mg of bismuth isooctanoate, 10 mg of rhodium isooctanoate and 10 mg of palladium acetylacetonate were added, and the mixture was fully mixed to obtain an organic gold coating.

[0021] 67 mg of ferric isooctanoate was dissolved in 200 mg of trichloroethane, added to the above organic gold coating while stirring, and ultrasonically dispersed. After fully mixing, the iron-doped organic gold coating was obtained.

[0022] The mass proportions of the components in the above-mentioned iron-doped organic gold coating are as follows: 28.3% of resin acid gold, 42.4% of pine alcohol, 18.9% of terpene resin, 1.0% of chromium isooctanoate, 1.2% of bismuth isooctanoate, 0.3% of rhodium isooctanoate, 0.3% of palladium acetylacetonate, 1.9% of iron isooctanoate and 5.7% of trichloroethane.

[0023] Apply the above iron-doped organic gold coating on a quartz substrate, place it at room temperature in a clean environment for 30 minutes, and transfer the sample to an annealing furnace. Set the heating rate of the annealing furnace to 10°C / min, heat it to 80°C, and heat it for 10 minutes; then continue to raise the temperature to 800°C, and heat it for 10 minutes at a heating rate of 10°C / min. After heating, wait for the annealing furnace temperature to drop below 100°C, take out the sample, and you can get the iron-doped gold coating. Test the infrared reflectivity of the iron-doped gold coating in the wavelength range of 1000-2500nm, which is 98%, see Figure 1 .

[0024] Example 2

[0025] 1000 mg of gold resinate (YDAUP002, YRD) was added to 1000 mg of a mixture of pine alcohol and linalool, wherein the mass ratio of pine alcohol to linalool was 1:1, and a gold resinate solution was obtained by magnetic stirring. 800 mg of terpene resin was added to 1000 mg of pine alcohol, and ultrasonic dispersion was used to form a uniform and stable terpene resin solution.

[0026] The terpene resin solution was added to the resin acid gold solution, and 40 mg of chromium isooctanoate and 40 mg of bismuth isooctanoate were added, and the mixture was fully mixed to obtain an organic gold coating.

[0027] 120 mg of ferric chloride hexahydrate was dissolved in 200 mg of acetone, added to the above organic gold coating while stirring, and ultrasonically dispersed. After fully mixing, the iron-doped organic gold coating was obtained.

[0028] The mass proportions of the components in the above-mentioned iron-doped organic gold coating are: resin acid gold 23.8%, pineol and linalool mixture 47.6%, terpene resin 19.0%, chromium isooctanoate 0.95%, bismuth isooctanoate 0.95%, ferric chloride hexahydrate 2.9% and acetone 4.8%.

[0029] Apply the above iron-doped organic gold coating on a quartz substrate, place it at room temperature in a clean environment for 30 minutes, and transfer the sample to an annealing furnace. Set the heating rate of the annealing furnace to 10℃ / min, heat it to 80℃, and heat it for 10 minutes; then continue to raise the temperature to 800℃, the heating rate is 10℃ / min, and heat it for 10 minutes. After heating, wait for the annealing furnace temperature to drop below 100℃, take out the sample, and you can get the iron-doped gold coating. Test the infrared reflectivity of the iron-doped gold coating in the wavelength range of 1000-2500nm, which is 91%.

[0030] Comparative Example 1

[0031] The difference between Comparative Example 1 and Example 1 is that no iron octoate solution is added to the organic gold coating in Comparative Example 1.

[0032] The infrared reflectivity of the gold coating in the wavelength range of 1000-2500nm is 96%. Figure 1 .

[0033] Comparative Example 2

[0034] The difference between Comparative Example 2 and Example 2 is that no ferric chloride hexahydrate solution is added to the organic gold coating in Comparative Example 2.

[0035] The infrared reflectivity of the gold coating was tested in the wavelength range of 1000-2500nm, which was 87%.

Claims

1. A method for improving the infrared reflection performance of a gold coating, characterized in that: The method comprises the following steps: dispersing an iron compound solution into an organic gold coating and stirring the mixture evenly to obtain an iron-doped organic gold coating; coating the iron-doped organic gold coating on a quartz substrate and obtaining an iron-doped gold coating by drying and annealing.

2. The method for improving the infrared reflection performance of the gold coating according to claim 1, characterized in that: The iron compound in the iron compound solution is selected from one or more of ferric thiocyanate, ferric isooctanoate, ferric chloride hexahydrate and ferric nitrate nonahydrate, and the solvent in the iron compound solution is selected from one or more of acetone, ethanol, trichloroethane and ether.

3. The method for improving the infrared reflection performance of the gold coating according to claim 1, characterized in that: The iron compound in the iron compound solution accounts for 1.9%-2.9% by weight of the iron-doped organic gold coating, and the solvent in the iron compound solution accounts for 4.8%-5.7% by weight of the iron-doped organic gold coating.

4. The method for improving the infrared reflection performance of the gold coating according to claim 3, characterized in that: The iron-doped organic gold coating comprises: resin acid gold with a mass fraction of 23%-29%, resin with a mass fraction of 19%, organic metal additive with a mass fraction of 1.9%-3%, and organic solvent with a mass fraction of 42%-48%.

5. The method for improving the infrared reflection performance of the gold coating according to claim 4, characterized in that: The resin is selected from one or more of terpene resin, epoxy resin, acrylic resin, alkyd resin and rosin resin.

6. The method for improving the infrared reflection performance of the gold coating according to claim 4, characterized in that: The organic metal additive is selected from one or more of bismuth isooctanoate, bismuth neodecanoate, chromium isooctanoate, chromium neodecanoate, rhodium isooctanoate, palladium acetylacetonate, yttrium isooctanoate and yttrium neodecanoate.

7. The method for improving the infrared reflection performance of the gold coating according to claim 4, characterized in that: The organic solvent is selected from one or more of terpineol, linalool, camphor oil, turpentine, ethylene glycol monobutyl ether, dibutyl phthalate and trichloroethane.

8. The method for improving the infrared reflection performance of a gold coating according to claim 1, characterized in that: The method for uniform stirring is ultrasound.

9. The method for improving the infrared reflection performance of a gold coating according to claim 1, characterized in that: The coating method is brush coating or spray coating.

10. The method for improving the infrared reflection performance of a gold coating according to claim 1, characterized in that: The drying temperature is 80° C. and the drying time is 10 min. The annealing temperature is 800° C. and the annealing atmosphere is air. The annealing time is 10 min. The drying and annealing furnace heating rate is 10° C. / min.

Images