Phosphate with photo-thermal conversion performance and application thereof

Abstract

The invention belongs to the technical field of development of photo-thermal conversion materials, and particularly relates to application of phosphate with photo-thermal conversion performance. The phosphate is used as a photo-thermal conversion material, contains an amorphous amorphous structure, and is prepared by the following process: firstly, preparing a phosphate conversion solution; then, metal is put into the phosphate conversion liquid; then, phosphate is separated out on the metal surface; finally, phosphate can be collected from the surface of the metal block or directly used as a metal surface phosphate coating. The phosphate conversion liquid is composed of phosphoric acid, nitrate and alkali. The phosphate designed and prepared by the invention can have good photothermal conversion performance, the temperature of the phosphate can be raised to 240.5 DEG C at most within 4 minutes under the irradiation of near-infrared light (808nm, 1.0 Wcm <-2 >), and meanwhile, the phosphate also has photothermal conversion stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of photothermal conversion material development, and in particular relates to the application of phosphate with photothermal conversion performance. Background Art

[0002] The photothermal property of a material refers to the property of the material to absorb light energy and convert it into heat energy under light irradiation. This property has important applications and development potential in many fields. Photothermal conversion materials are widely used, involving multiple disciplines, including materials science, energy, environment, biomedicine, etc. Photothermal materials (such as selective absorption coatings) are used to heat water, which is widely used in household and industrial hot water supply. In the field of environmental governance, photothermal materials can be used to generate heat under light irradiation to promote chemical reactions and be used to degrade organic pollutants, nitrogen oxides, etc.; photothermal materials can also be used to heat seawater, evaporate water, collect steam for desalination, and solve the problem of water shortage. In biomedicine, photothermal materials (such as nanoparticles) are used to generate heat under light irradiation of specific wavelengths to selectively kill cancer cells and bacteria, and are used in tumor treatment. At the same time, photothermal materials can be used as drug carriers, and the photothermal effect is used to control drug release and improve the therapeutic effect. Furthermore, photothermal stimulation can promote cell proliferation and tissue regeneration, which is applied to wound healing and bone regeneration.

[0003] The photothermal properties of materials have broad application prospects in the fields of solar energy utilization, environmental governance, biomedicine, etc. With the development of new photothermal materials and technological advances, the research on photothermal properties will continue to deepen, promoting innovation and development in related fields. In the future, photothermal materials will provide important technical support for solving energy crises, environmental pollution and health problems. Existing photothermal conversion materials are generally reduced graphene oxide (such as patent CN202210251817.0). Of course, some people have tried to develop a phosphate glass with a photothermal effect, such as patent CN116002976A; in this patent, a transition metal element source is used to give phosphate glass photothermal properties. However, this photothermal performance does not come from the phosphate itself, but from the transition metal element source doped inside it.

[0004] Phosphates exist in large quantities in nature. Because of their many special physical and chemical properties, they are often used in the food industry, chemical fertilizer additives, refractory materials and metal surface treatment. As we all know, phosphates are relatively stable and generally do not have photothermal properties. They do not show obvious temperature changes under near-infrared light. Summary of the invention

[0005] At present, there is no report on the process of preparing phosphates with photothermal conversion performance. The phosphates with photothermal conversion performance and the preparation method and application thereof proposed in the present invention can effectively provide reference guidance for subsequent research and development.

[0006] The present invention develops a phosphate with photothermal conversion performance for the first time and uses it as a photothermal conversion material.

[0007] The present invention provides a phosphate with photothermal conversion performance, wherein the phosphate contains an amorphous non-crystalline structure and is prepared by the following process: first, a phosphate conversion solution is prepared; then, a metal is placed in the phosphate conversion solution; thereafter, the phosphate is precipitated on the metal surface; finally, the phosphate can be separated from the metal surface to obtain a product; the metal is selected from at least one of magnesium, iron, aluminum and zinc.

[0008] The present invention provides a phosphate with photothermal conversion performance. Water, phosphoric acid, nitrate and alkali are mixed uniformly according to a designed ratio to obtain a phosphate conversion solution. The phosphate conversion solution; the phosphoric acid is calculated as 14.7 mol / L of stock phosphoric acid, 1L of water is added with 5-75 ml of stock phosphoric acid, the alkali is added at a ratio of 5-45 g, preferably 14-16 g, to 1L of water, and the nitrate is added at a ratio of 10-60 g to 1L of water; the alkali is strong sodium oxide and / or potassium hydroxide; the nitrate is selected from at least one of calcium nitrate, zinc nitrate, magnesium nitrate, aluminum nitrate, sodium nitrate and potassium nitrate; The metal support is placed in the phosphate conversion solution for at least 5 minutes; then the metal support is taken out from the phosphate conversion solution and dried to obtain a product.

[0009] The present invention discovers and prepares phosphate with photothermal conversion performance for the first time.

[0010] The present invention discloses an application of a phosphate having photothermal conversion performance. The phosphate is used as a photothermal conversion material and contains an amorphous non-crystalline structure.

[0011] The present invention discloses an application of a phosphate with photothermal conversion performance, wherein the phosphate heats up under light conditions, and the light is selected from at least one of infrared light, near-infrared light, far-infrared light, ultraviolet light, visible light or sunlight.

[0012] The application of the phosphate with photothermal conversion performance of the present invention can increase the temperature to 240.5°C in 4 minutes under near-infrared light irradiation, wherein the wavelength of the near-infrared light is 808nm and the emission power is 1.0Wcm -2 .

[0013] Preferably, the present invention provides an application of phosphate having photothermal conversion performance, wherein the phosphate is prepared by the following process: First, a phosphate conversion solution is prepared; then, the metal is placed in the phosphate conversion solution; then, phosphate is precipitated on the metal surface; finally, the phosphate can be scraped off the surface of the metal block and collected or directly used as a phosphate coating on the metal surface. The phosphate conversion solution is composed of phosphoric acid, nitrate and alkali.

[0014] The metal is selected from at least one of magnesium alloy, iron alloy, aluminum alloy, zinc alloy, etc. Preferably, the metal is selected from at least one of pure magnesium, WE43 magnesium alloy, AZ31 magnesium alloy, ZK60 magnesium alloy, AM60B magnesium alloy, pure iron, Q235 stainless steel, 45# steel, pure aluminum, 5052, 6061, 7075, LY1, pure zinc, Zn0.6Li, ZA27, SJ1; preferably pure magnesium, WE43 magnesium alloy, AZ32 magnesium alloy, Zn0.6Li alloy.

[0015] The phosphate prepared by the present invention not only has excellent photothermal conversion performance, but also has photothermal conversion stability performance, wherein the photothermal conversion stability performance refers to that the photothermal conversion performance of the material decreases by less than 1% after a cooling cycle.

[0016] The present invention provides an application of a phosphate having photothermal conversion performance, wherein the phosphate is prepared by the following steps: Step 1 Preparation of phosphate conversion solution The water, phosphoric acid, nitrate and alkali are mixed uniformly according to the designed ratio to obtain a phosphate conversion solution, wherein the phosphoric acid is calculated as 14.7 mol / L stock phosphoric acid, 5-75 ml of stock phosphoric acid is added to 1L of water, the alkali is added at a ratio of 5-45 g, preferably 14-16 g, to 1L of water, and the nitrate is added at a ratio of 10-60 g to 1L of water; the alkali is strong sodium hydroxide and / or potassium hydroxide; the nitrate is selected from at least one of calcium nitrate, zinc nitrate, magnesium nitrate, aluminum nitrate, sodium nitrate and potassium nitrate; Step 2 The metal support is placed in the phosphate conversion solution for at least 5 minutes; then the metal support is taken out from the phosphate conversion solution and dried to obtain a product.

[0017] Preferably, before the phosphate conversion solution is prepared, calcium nitrate is prepared at a ratio of 25-35 g / L, preferably 30 g / L; zinc nitrate is prepared at a ratio of 15-25 g / L, preferably 20 g / L; and magnesium nitrate is prepared at a ratio of 45-55 g / L, preferably 50 g / L.

[0018] The present invention provides an application of phosphate with light-heat conversion performance. When the metal carrier is magnesium or a magnesium alloy, the metal carrier is placed in a phosphate conversion solution for at least 10 minutes, preferably 10 to 20 minutes, and more preferably 15 minutes. The magnesium alloy is selected from one of WE43 magnesium alloy, AZ31 magnesium alloy, ZK60 magnesium alloy, and AM60B magnesium alloy.

[0019] In the application of phosphate with light-to-heat conversion performance of the present invention, when the metal carrier is iron or iron alloy, the metal carrier is placed in the phosphate conversion liquid for at least 100 minutes, preferably 150 to 240 minutes, and more preferably 175 to 240 minutes. The iron alloy is Q235 stainless steel or 45 steel.

[0020] The present invention provides an application of phosphate with light-heat conversion performance. When the metal carrier is zinc or zinc alloy, the metal carrier is placed in the phosphate conversion solution for at least 30 minutes, preferably 35 to 45 minutes, and more preferably 40 minutes. The iron alloy is selected from one of Zn0.6Li, ZA27 zinc alloy, and SJ1 zinc-based alloy.

[0021] The present invention provides an application of phosphate with light-to-heat conversion performance. When the metal carrier is aluminum or aluminum alloy, the metal carrier is placed in the phosphate conversion solution for at least 100 minutes, preferably 150 to 240 minutes, and more preferably 175 to 240 minutes. The aluminum alloy is 5052 aluminum alloy, 6061 aluminum alloy, 7075 aluminum alloy, and LY1 aluminum alloy.

[0022] The present invention discloses an application of phosphate with light-to-heat conversion performance, wherein the metal carrier is selected from at least one of pure magnesium, WE43 magnesium alloy, AZ32 magnesium alloy, and Zn0.6Li alloy.

[0023] The phosphate designed and prepared by the present invention can have good light-to-heat conversion performance, and the phosphate can quickly increase the surface temperature under near-infrared light irradiation.

[0024] Principles and advantages Photothermal effect refers to the phenomenon that when a substance absorbs light energy, its temperature changes. Photothermal effect has important applications in many fields, including solar energy utilization, material processing, biomedicine, etc. However, some of the existing processes for preparing photothermal materials are relatively complicated, such as organic synthesis. Its preparation process is complicated and the raw materials are expensive, which is not easy to achieve industrial application. The present invention discovers and prepares phosphates with photothermal conversion performance for the first time, which belongs to a common salt in nature and is conducive to large-scale application. First, the phosphate conversion solution is prepared; then, the more active metal block / plate / foil (magnesium, iron, aluminum and zinc, etc.) is placed in the phosphate conversion solution; then, the phosphate with photothermal performance will precipitate on the surface of the metal block; finally, the phosphate with photothermal performance can be collected from the surface of the metal carrier or directly used as a phosphate coating on the metal surface. The phosphate designed and prepared by the present invention can have good photothermal conversion performance, the phosphate can quickly increase the surface temperature under near-infrared light irradiation, and the photothermal performance of the phosphate is stable (the photothermal performance does not decrease after multiple temperature rise and fall cycles). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The surface SEM morphology and EDS elemental spectra of the products obtained in Examples 1-3; Figure 2 TEM morphology and EDS elemental spectra of the products obtained in Examples 1-3; Figure 3 TEM morphology and electron diffraction pattern of the products obtained in Examples 1-3; Figure 4 The products obtained in Examples 1-3 were irradiated with near-infrared laser (808 nm, 2.0 W cm -2 )Processing 240 s of photothermal heating curve, heating and cooling cycle curve, single heating and cooling cycle curve, heating infrared photos in air, and heating infrared photos in buffer solution; Figure 5 The Ca purchased in Comparative Example 1 3 (PO 4 ) 2 Calcium phosphate spherical blocks were irradiated by near-infrared laser (808 nm, 1.0 W cm -2 ) Temperature variation diagram for the next 4 minutes; Figure 6 The CaHPO purchased in Comparative Example 2 4 ·2H 2 O calcium phosphate spherical block under near-infrared laser irradiation (808 nm, 1.0 W cm -2 ) Temperature variation diagram for the next 4 minutes; Figure 7The Zn purchased in Comparative Example 3 3 (PO 4 ) 2 Calcium phosphate spherical blocks were irradiated by near-infrared laser (808 nm, 1.0 W cm -2 ) Temperature variation diagram for the next 4 minutes; Figure 8 Mg purchased in Comparative Example 4 3 (PO 4 ) 2 Calcium phosphate spherical blocks were irradiated by near-infrared laser (808 nm, 1.0 W cm -2 ) Temperature variation diagram for the next 4 minutes; Fig. 9 The calcium phosphate prepared in Example 1, the zinc phosphate prepared in Example 2, and the magnesium phosphate prepared in Example 3 were irradiated with near-infrared laser (808 nm, 1.0 W cm -2 ) for 4 minutes.

[0026] Figure 1 (a) is the surface SEM morphology and EDS elemental spectrum of the calcium phosphate prepared in Example 1; (b) is the surface SEM morphology and EDS elemental spectrum of the zinc phosphate prepared in Example 2; (c) is the surface SEM morphology and EDS elemental spectrum of the magnesium phosphate prepared in Example 3. Figure 1 The surface morphology and elemental composition of the three phosphates as coatings can be seen.

[0027] Figure 2 (a) is the TEM morphology and EDS elemental spectrum of the calcium phosphate prepared in Example 1, (b) is the TEM morphology and EDS elemental spectrum of the zinc phosphate prepared in Example 2, and (c) is the TEM morphology and EDS elemental spectrum of the magnesium phosphate prepared in Example 3. Figure 2 The morphology and elemental composition of the three phosphate powders can be seen in the figure.

[0028] Figure 3 TEM morphology and electron diffraction pattern of the calcium phosphate salt obtained in Example 1, the zinc phosphate salt obtained in Example 2, and the magnesium phosphate salt obtained in Example 3; Figure 3 It can be seen that the three phosphates are in an amorphous state, and no crystalline electron diffraction patterns appear.

[0029] Figure 4 (a) is the photothermal temperature rise curve of the calcium phosphate salt obtained in Example 1, the zinc phosphate salt obtained in Example 2, and the magnesium phosphate salt obtained in Example 3; (b) is the temperature rise and fall cycle curve of the three phosphates, (c) is the single temperature rise and fall cycle curve of the three phosphates, (d) is the temperature rise infrared photo of the three phosphates in air, and (e) is the temperature rise infrared photo of the three phosphates in buffer solution; Figure 4 It can be seen that the three phosphates have good photothermal conversion performance, and the photothermal conversion performance does not decrease significantly after multiple cycles.

[0030] from Figure 5 It can be seen from the comparative example 1 that the Ca 3 (PO 4 ) 2 Calcium phosphate salts have almost no photothermal conversion performance.

[0031] from Figure 6 It can be seen that the CaHPO purchased in Comparative Example 2 4 ·2H2O calcium phosphate has almost no photothermal conversion performance.

[0032] from Figure 7 It can be seen from the comparative example 3 that the Zn purchased 3 (PO 4 ) 2 Calcium phosphate salts have almost no photothermal conversion performance.

[0033] from Figure 8 It can be seen from the comparative example 4 that the Mg 3 (PO 4 ) 2 Calcium phosphate salts have almost no photothermal conversion performance.

[0034] from Fig. 9 It can be seen that the prepared phosphate has good photothermal properties. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The technical solutions for implementing the present invention will be described in detail. The described examples are only some examples of the present invention. All other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0036] The preparation process will be described below through specific examples.

[0037] Example 1 (a) First, the phosphate conversion solution is prepared. The calcium phosphate conversion solution is prepared by adding deionized water, phosphoric acid, calcium nitrate and sodium hydroxide into a beaker. The concentration of calcium nitrate in the calcium phosphate conversion solution is 30g / L, the concentration of phosphoric acid (purity is analytical grade 14.7mol / L) is 50ml / L, and the concentration of sodium hydroxide is 15g / L.

[0038] (b) A relatively active clean WE43 magnesium alloy metal block was placed in the calcium phosphate conversion solution for 15 min.

[0039] (c) The WE43 magnesium alloy metal block is taken out from the calcium phosphate conversion solution and placed in a drying oven at a constant temperature of 60°C for 4 hours. Finally, the calcium phosphate with photothermal properties is scraped off the surface of the metal block for collection or directly used as a phosphate coating on the metal surface.

[0040] from Figure 1 (a) It can be seen that the calcium phosphate salt in Example 1 has been successfully prepared. Figure 2 (a) further shows the structure and elemental composition of calcium phosphate. Figure 3 It can be seen that the prepared calcium phosphate salt is partially an amorphous non-crystalline structure. Figure 4 It can be seen that the calcium phosphate prepared in Example 1 has very excellent photothermal conversion performance, and the photothermal performance of the phosphate is stable (the photothermal performance does not decrease after multiple heating and cooling cycles). -2 ) The maximum temperature can be raised to 227.0℃ in 4 minutes. After heating to 227.0℃ and cooling naturally, the temperature can be raised to above 226.4℃ within 240s at the 101st heating after repeating the near-infrared light irradiation heating and natural cooling 100 times.

[0041] Example 2 (a) First, the phosphate conversion solution is prepared. The zinc phosphate conversion solution is prepared by adding deionized water, phosphoric acid, zinc nitrate and sodium hydroxide into a beaker. The concentration of zinc nitrate in the zinc phosphate conversion solution is 18g / L, the concentration of phosphoric acid (purity is analytical grade 14.7mol / L) is 50ml / L, and the concentration of sodium hydroxide is 15g / L.

[0042] (b) Place the relatively active clean WE43 magnesium alloy metal block in the zinc phosphate conversion solution for 15 minutes.

[0043] (c) The WE43 magnesium alloy metal block is taken out from the zinc phosphate conversion solution and placed in a drying oven at a constant temperature of 60°C for 4 hours. Finally, the zinc phosphate with photothermal properties is scraped off the surface of the metal block and collected or directly used as a phosphate coating on the metal surface.

[0044] from Figure 1 (b) It can be seen that the zinc phosphate salt in Example 2 has been successfully prepared. Figure 2 (b) further shows the structure and elemental composition of zinc phosphate. Figure 3 It can be seen that the prepared zinc phosphate salt is partially amorphous. Figure 4 It can be seen that the zinc phosphate prepared in Example 1 has very excellent photothermal conversion performance, and the photothermal performance of the phosphate is stable (the photothermal performance does not decrease after multiple heating and cooling cycles). Phosphate is irradiated with near-infrared light (808nm, 1.0Wcm -2) The maximum temperature can be raised to 231.5℃ in 4 minutes. After heating to 231.5℃ and cooling naturally, the temperature can be raised to 230.8℃ within 240s at the 101st heating after repeating the near-infrared light irradiation heating and natural cooling 100 times.

[0045] Example 3 (a) First, the phosphate conversion solution is prepared. The magnesium phosphate conversion solution is prepared by adding deionized water, phosphoric acid, magnesium nitrate and sodium hydroxide into a beaker. The concentration of magnesium nitrate in the magnesium phosphate conversion solution is 50g / L, the concentration of phosphoric acid (purity is analytical grade 14.7mol / L) is 50ml / L, and the concentration of sodium hydroxide is 15g / L.

[0046] (b) Place the relatively active clean WE43 magnesium alloy metal block into the magnesium phosphate conversion solution for 15 minutes.

[0047] (c) The WE43 magnesium alloy metal block is taken out from the magnesium phosphate conversion solution and placed in a drying oven at a constant temperature of 60°C for 4 hours. Finally, the magnesium phosphate with photothermal properties is scraped off the surface of the metal block for collection or directly used as a phosphate coating on the metal surface.

[0048] from Figure 1 (c) It can be seen that the magnesium phosphate salt in Example 3 has been successfully prepared. Figure 2 (c) further shows the structure and elemental composition of magnesium phosphate. Figure 3 It can be seen that the prepared magnesium phosphate salt is partially an amorphous non-crystalline structure. Figure 4 It can be seen that the magnesium phosphate prepared in Example 3 has very excellent photothermal conversion performance, and the photothermal performance of the phosphate is stable (the photothermal performance does not decrease after multiple heating and cooling cycles). Phosphate is irradiated with near-infrared light (808nm, 1.0Wcm -2 ) The maximum temperature can be raised to 240.5℃ in 4 minutes. After heating to 240.5℃ and cooling naturally, the temperature can be raised to 239.6℃ within 240s at the 101st heating after repeating the near-infrared light irradiation heating and natural cooling 100 times.

[0049] Example 4 The other conditions are the same as those in Example 1, except that the WE43 magnesium alloy metal block is changed to an AZ31 magnesium alloy metal block.

[0050] The obtained phosphate also has good photothermal conversion performance and stable photothermal performance. Phosphate is irradiated with near-infrared light (808nm, 1.0Wcm -2 ) The maximum temperature can be raised to 215.2℃ in 4 minutes. After heating to 215.2℃ and cooling naturally, the temperature can be raised to 214.0℃ within 240s at the 101st heating after repeating the near-infrared light irradiation heating and natural cooling 100 times.

[0051] Example 5 The other conditions are the same as those in Example 1, except that the WE43 magnesium alloy metal block is changed to a ZK60 magnesium alloy metal block.

[0052] The obtained phosphate also has good photothermal conversion performance and stable photothermal performance. Phosphate is irradiated with near-infrared light (808nm, 1.0Wcm -2 ) The maximum temperature can be raised to 221.6℃ in 4 minutes. After heating to 221.6℃ and cooling naturally, the temperature can be raised to 219.8℃ within 240s at the 101st heating after repeating the near-infrared light irradiation heating and natural cooling 100 times.

[0053] Example 6 Other conditions were consistent with those in Example 1, except that the WE43 magnesium alloy metal block was replaced with a Q235 steel metal block, and the time in the phosphate conversion solution was changed to 4 h.

[0054] The obtained phosphate also has good photothermal conversion performance and stable photothermal performance. Phosphate is irradiated with near-infrared light (808nm, 1.0Wcm -2 ) The maximum temperature can be raised to 114.6℃ in 4 minutes. After heating to 114.6℃ and cooling naturally, the temperature can be raised to 112.8℃ within 240s at the 101st heating after repeating the near-infrared light irradiation heating and natural cooling 100 times.

[0055] Example 7 Other conditions were consistent with those in Example 1, except that the WE43 magnesium alloy metal block was changed to a Zn0.6Li zinc alloy metal block, and the time in the phosphate conversion solution was changed to 30 min.

[0056] The obtained phosphate also has good photothermal conversion performance and stable photothermal performance. Phosphate is irradiated with near-infrared light (808nm, 1.0Wcm -2 ) The maximum temperature can be raised to 82.6℃ in 4 minutes. After heating to 82.6℃ and cooling naturally, the temperature can be raised to 80.7℃ within 240s at the 101st heating after repeating the near-infrared light irradiation heating and natural cooling 100 times.

[0057] Example 8 Other conditions were consistent with those in Example 1, except that the WE43 magnesium alloy metal block was changed to a pure aluminum metal block, and the time in the phosphate conversion solution was changed to 4 h.

[0058] The obtained phosphate also has good photothermal conversion performance and stable photothermal performance. Phosphate is irradiated with near-infrared light (808nm, 1.0Wcm -2) The maximum temperature can be raised to 51.3℃ in 4 minutes. After heating to 51.3℃ and cooling naturally, the near-infrared light irradiation heating and natural cooling were repeated 100 times. At the 101st heating, the temperature can be raised to 51.2℃ within 240s.

[0059] Example 9 The other conditions are the same as those in Example 1, except that the concentrations of nitrate, phosphoric acid and sodium hydroxide in the solution are reduced by 80%, that is, the phosphate conversion solution is prepared first, and the calcium phosphate conversion solution is prepared by adding deionized water, phosphoric acid, calcium nitrate and sodium hydroxide into a beaker. The concentration of calcium nitrate in the calcium phosphate conversion solution is 6 g / L, the concentration of phosphoric acid (purity is analytical grade 14.7 mol / L) is 10 ml / L, and the concentration of sodium hydroxide is 3 g / L; The results show that the yield and photothermal effect of the prepared phosphate are far worse than those in Example 1, which shows that the concentration has a crucial influence on the photothermal conversion performance of the product.

[0060] Comparative Example 1 Buy calcium phosphate salt (Ca) from Aladdin website 3 (PO4) 2 ) powder, the purity is analytically pure, and is pressed into round blocks by a briquetting machine.

[0061] The obtained calcium phosphate round block does not have the photothermal conversion performance. Figure 5 As shown in the figure, the calcium phosphate round block is illuminated by near-infrared light (808 nm, 1.0 W cm -2 ) There is basically no temperature change within 4 minutes.

[0062] Comparative Example 2 Buy calcium phosphate salt (CaHPO) from the Aladdin website 4 ·2H 2 O) Powder, purity is analytical grade, pressed into round blocks by a briquetting machine.

[0063] The obtained calcium phosphate round block does not have the photothermal conversion performance. Figure 6 As shown in the figure, the calcium phosphate round block is illuminated by near-infrared light (808 nm, 1.0 W cm -2 ) There is basically no temperature change within 4 minutes.

[0064] Comparative Example 3 Buy zinc phosphate (Zn 3 (PO 4 ) 2 ) powder, the purity is analytically pure, and is pressed into round blocks by a briquetting machine.

[0065] The obtained zinc phosphate round block does not have the photothermal conversion performance. Figure 7As shown in the figure, the zinc phosphate round block is illuminated by near-infrared light (808 nm, 1.0 W cm -2 ) There is basically no temperature change within 4 minutes.

[0066] Comparative Example 4 Buy magnesium phosphate salt (Mg) from Aladdin 3 (PO 4 ) 2 The powder, purity is analytically pure, and is pressed into round blocks by a briquetting machine.

[0067] The obtained magnesium phosphate round block does not have the photothermal conversion performance. Figure 8 As shown in the figure, the magnesium phosphate round block is illuminated by near-infrared light (808 nm, 1.0 W cm -2 ) There is basically no temperature change within 4 minutes.

[0068] Comparative Example 5 Other conditions were consistent with those in Example 1, except that the WE43 magnesium alloy metal block was changed to a silicon wafer. The results showed that phosphate could not be deposited thereon, resulting in preparation failure.

[0069] Those skilled in the art should understand that the above embodiments and comparative examples are only further detailed descriptions of the present invention, and the present invention is not limited to the above specific implementation methods. Under the above guidance of the present invention, various improvements and modifications can be made on the basis of the embodiments, and these improvements or modifications belong to the protection scope of the present invention. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A phosphate having photothermal conversion performance, characterized in that: The phosphate contains an amorphous non-crystalline structure and is prepared by the following process: first, a phosphate conversion solution is prepared; then, a metal is placed in the phosphate conversion solution; thereafter, the phosphate is precipitated on the metal surface; finally, the phosphate can be separated from the metal surface to obtain a product; the metal is selected from at least one of magnesium, iron, aluminum, and zinc.

2. The phosphate having photothermal conversion performance according to claim 1, characterized in that: The water, phosphoric acid, nitrate and alkali are mixed uniformly according to the designed ratio to obtain a phosphate conversion solution, wherein the phosphoric acid is calculated as 14.7 mol / L stock phosphoric acid, 5-75 ml of stock phosphoric acid is added to 1L of water, the alkali is added at a ratio of 5-45 g, preferably 14-16 g, to 1L of water, and the nitrate is added at a ratio of 10-60 g to 1L of water; the alkali is strong sodium hydroxide and / or potassium hydroxide; the nitrate is selected from at least one of calcium nitrate, zinc nitrate, magnesium nitrate, aluminum nitrate, sodium nitrate and potassium nitrate; The metal support is placed in the phosphate conversion solution for at least 5 minutes; then the metal support is taken out from the phosphate conversion solution and dried to obtain a product.

3. An application of phosphate with photothermal conversion performance, characterized in that: The phosphate is used as a photothermal conversion material, and the phosphate contains an amorphous non-crystalline structure.

4. The use of a phosphate having photothermal conversion performance according to claim 1, characterized in that: The phosphate is heated up under light conditions, and the light is selected from at least one of infrared light, near infrared light, far infrared light, ultraviolet light, visible light or sunlight.

5. The use of a phosphate having photothermal conversion performance according to claim 1, characterized in that: The temperature can be raised to 240.5°C in 4 minutes under near-infrared light irradiation. The wavelength of the near-infrared light is 808nm and the emission power is 1.0Wcm -2 .

6. The use of a phosphate having photothermal conversion performance according to claim 1, characterized in that: Phosphates are prepared by the following process; First, prepare the phosphate conversion solution; then, put the metal into the phosphate conversion solution; then, phosphate is precipitated on the metal surface; finally, the phosphate can be scraped off the surface of the metal block and collected or directly used as a phosphate coating on the metal surface; the metal is selected from at least one of magnesium, iron, aluminum, and zinc. Preferably, the metal is selected from at least one of pure magnesium, WE43 magnesium alloy, AZ31 magnesium alloy, ZK60 magnesium alloy, AM60B magnesium alloy, pure iron, Q235 stainless steel, 45# steel, pure aluminum, 5052, 6061, 7075, LY1, pure zinc, Zn0.6Li, ZA27, and SJ1; preferably, pure magnesium, WE43 magnesium alloy, AZ32 magnesium alloy, and Zn0.6Li alloy.

7. The use of a phosphate having photothermal conversion performance according to claim 6, characterized in that: The prepared phosphate not only has photothermal conversion performance, but also has photothermal conversion stability performance, and the photothermal conversion stability performance refers to that the photothermal conversion performance of the material decreases by less than 1% after a cooling cycle.

8. The use of a phosphate having photothermal conversion performance according to claim 6, characterized in that: The phosphate is prepared by the following steps: Step 1 Preparation of phosphate conversion solution The water, phosphoric acid, nitrate and alkali are mixed uniformly according to the designed ratio to obtain a phosphate conversion solution, wherein the phosphoric acid is calculated as 14.7 mol / L stock phosphoric acid, 5-75 ml of stock phosphoric acid is added to 1L of water, the alkali is added at a ratio of 5-45 g, preferably 14-16 g, to 1L of water, and the nitrate is added at a ratio of 10-60 g to 1L of water; the alkali is strong sodium hydroxide and / or potassium hydroxide; the nitrate is selected from at least one of calcium nitrate, zinc nitrate, magnesium nitrate, aluminum nitrate, sodium nitrate and potassium nitrate; Step 2 The metal support is placed in the phosphate conversion solution for at least 5 minutes; then the metal support is taken out from the phosphate conversion solution and dried to obtain a product.

9. The use of a phosphate having photothermal conversion performance according to claim 8, characterized in that: Before preparing the phosphate conversion solution, calcium nitrate is prepared at a ratio of 25-35 g / L, preferably 30 g / L; zinc nitrate is prepared at a ratio of 15-25 g / L, preferably 20 g / L; magnesium nitrate is prepared at a ratio of 45-55 g / L, preferably 50 g / L; When the metal carrier is magnesium or a magnesium alloy, the metal carrier is placed in the phosphate conversion solution for at least 10 minutes, preferably 10 to 20 minutes, and more preferably 15 minutes; the magnesium alloy is selected from one of WE43 magnesium alloy, AZ31 magnesium alloy, ZK60 magnesium alloy, and AM60B magnesium alloy; When the metal carrier is iron or an iron alloy, the metal carrier is placed in the phosphate conversion solution for at least 100 minutes, preferably 150 to 240 minutes, and more preferably 175 to 240 minutes; the iron alloy is Q235 stainless steel or 45 steel; When the metal carrier is zinc or a zinc alloy, the metal carrier is placed in the phosphate conversion solution for at least 30 minutes, preferably 35 to 45 minutes, and more preferably 40 minutes; the iron alloy is selected from one of Zn0.6Li, ZA27 zinc alloy, and SJ1 zinc-based alloy; When the metal carrier is aluminum or an aluminum alloy, the metal carrier is placed in the phosphate conversion solution for at least 100 minutes, preferably 150 to 240 minutes, and more preferably 175 to 240 minutes. The aluminum alloy is 5052 aluminum alloy, 6061 aluminum alloy, 7075 aluminum alloy, or LY1 aluminum alloy.

10. The use of a phosphate having photothermal conversion performance according to claim 7, characterized in that: The metal carrier is selected from at least one of pure magnesium, WE43 magnesium alloy, AZ31 magnesium alloy and Zn0.6Li alloy.

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