CN112322291B - Dual-waveband agricultural greenhouse film fluorescent light conversion powder and preparation method thereof - Google Patents
Dual-waveband agricultural greenhouse film fluorescent light conversion powder and preparation method thereof Download PDFInfo
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- CN112322291B CN112322291B CN202011367746.8A CN202011367746A CN112322291B CN 112322291 B CN112322291 B CN 112322291B CN 202011367746 A CN202011367746 A CN 202011367746A CN 112322291 B CN112322291 B CN 112322291B
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/14—Greenhouses
- A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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Abstract
The invention relates to a dual-waveband fluorescent light conversion material which is a rare earth inorganic compound and can absorb ultraviolet rays in natural light and efficiently convert the ultraviolet rays into red light and blue light. The fluorescent material is used as an additive to prepare an agricultural fluorescent light conversion film which can be used for plastic greenhouses. The agricultural polymer film can absorb ultraviolet rays of 200-400 nanometers in natural light, the absorption rate is more than 98%, and the absorbed ultraviolet rays are converted into red light and blue light required by plants, so that the yield and the quality of crops are improved, and the growth period is shortened.
Description
Technical Field
The invention belongs to the technical field of light conversion agricultural greenhouse films, and particularly relates to a dual-band ultraviolet red-blue agricultural fluorescent light conversion agent and a preparation method thereof.
Background
Sunlight is a necessary condition for plant growth, but not all bands in sunlight are beneficial for plant growth. The action of light on plants is very closely related to the spectral composition. Each plant has its specific spectrum of optimum growth, however, the spectrum of sunlight striking the ground is not the spectrum of optimum for crop growth. In the solar spectrum, ultraviolet rays of 200-400 nanometers are harmful to plant growth, green light in visible light is completely reflected by leaves and is wasted, and blue light and red light in the solar spectrum are beneficial to plant growth. Therefore, the research on the optimal action spectrum of the crop growth and the artificial simulation thereof have important academic value and practical significance.
Based on the rule that chlorophyll has strong absorption to blue light and red light but no absorption to ultraviolet light, a fluorescent material capable of absorbing ultraviolet light and emitting blue light (or red light) is synthesized and added into a greenhouse film to be made into an agricultural light conversion film. Compared with the common film, the light conversion film can obviously improve the photosynthesis intensity of crops, improve the ground temperature and the greenhouse temperature, reduce the disease index of the crops, accelerate the development process, improve the crop yield and increase the content of vitamin C, carotene and soluble sugar in fruits.
China has become the world's largest agricultural film market at present. According to statistics of national statistical departments, the total using amount of the agricultural film in the country in 2017 reaches 252.8 ten thousand tons, wherein the mulching film is 143.7 ten thousand tons, the mulching film coverage area reaches 2.76 hundred million mu, and the total area of the farmland in the year is about 12 percent. At present, agricultural planting structures are being adjusted in many areas of China, and the planting area of economic crops is greatly increased. Because most of the current agricultural films still belong to non-light conversion films, if the light conversion films are popularized in a large area, the economic benefits brought by only increasing the yield and precocity are very great, and therefore, the field has wide development potential.
The currently commonly used greenhouse film material is Polyethylene (PE) or polyvinyl chloride (PVC) as a matrix, and then a doped ultraviolet-shielding greenhouse film material (Japanese patent laid-open No. 53-136050)) is developed (the ultraviolet absorption rate can reach 90%). Such a film can insulate ultraviolet rays well, but does not make full use of sunlight because ultraviolet rays cannot be converted into visible light. WO8501945C reports the dispersion of certain rare earth complexes into polymers to form light conversion films. However, such a light conversion film has a short light stabilization time and is extremely high in cost. In recent years, with the rapid development of agricultural film market, more and more research reports of fluorescent light conversion agents and light conversion films appear. For example: chinese patent CN104844833A, CN104108215A, CN103160008A, CN102250410A, CN101434724B discloses the use method of an agricultural fluorescent light conversion agent or light conversion film respectively. The light conversion agents have the advantages of complex preparation method, high cost and short light stabilization time. In particular, these light converting materials emit only a single wavelength (blue or red).
The market urgently needs a fluorescent material and a light conversion film which have simple preparation method, low cost, long light stabilization time and blue and red dual-waveband emission.
Disclosure of Invention
In order to solve the problems of complex preparation method, high cost, short light stabilization time and only single-wavelength emission of the light conversion agent in the prior art, the invention provides novel agricultural fluorescent light conversion powder which has the advantages of blue and red dual-band emission, simple preparation method, long light stabilization time, low cost and the like.
In order to achieve the purpose, the invention provides novel agricultural fluorescent light conversion powder. The light conversion powder can convert ultraviolet light into red light and blue light and has the characteristic of dual-waveband emission. The chemical general formula of the light conversion powder is Mg 6 RE 2 (HO) 16 CO 3 Wherein RE is rare earth Y 3+ ，La 3+ ，Gd 3+ ，Eu 3+ And Dy 3+ Or a combination of one or more thereof.
The invention also provides a preparation method of the fluorescent light conversion powder, which comprises the following steps:
separately preparing Mg 2+ /RE 3+ Mixed aqueous solution of (3), and Na 2 CO 3 NaOH. Slowly dripping the two solutions into a certain amount of water, and adding NaOH was controlled to pH =10 to obtain a precipitate. After reacting for 3 hours, washing and drying the precipitate to obtain the fluorescent light conversion powder.
The invention also provides a light conversion film which comprises the agricultural fluorescent light conversion powder. The polymer film for agricultural use can absorb ultraviolet rays of 200-400 nanometers in natural light, the absorptivity reaches more than 98 percent, and the absorbed ultraviolet rays are converted into red light and blue light required by plants, so that the yield and the quality of crops are improved, and the growth period is shortened.
The invention also claims the application of the light conversion film, which is used as an agricultural film or a greenhouse film.
The invention has the following beneficial effects:
the agricultural fluorescent light conversion film provided by the invention can absorb ultraviolet rays of 200-400 nanometers in natural light and convert the ultraviolet rays into red light and blue light, and has the advantages of simple preparation method and long light stabilization time.
Drawings
FIG. 1 is a spectrum of the fluorescence emission of the UV-to-Red + blue agricultural phosphor powder prepared in example 1.
Detailed Description
The present invention is further described below with reference to examples.
Example 1: purple reddish purple + blue Mg 6 Eu 1 Dy 1 (HO) 16 CO 3 And (4) fluorescent powder.
Solution A: na (Na) 2 CO 3 (3 mmol) + NaOH (7 mmol) +6ml of water
Solution B: mg (NO) 3 ) 2 (6mmol)+Eu(NO 3 ) 3 (1mmol)+Dy(NO 3 ) 3 (1 mmol) +10ml of water.
Solution C: 20ml of water. A and B were added dropwise to the solution C with rapid stirring to give a white precipitate. The solution pH =10 was controlled with NaOH. After the completion of the dropwise addition, the reaction was continued for 3 hours. The reaction product is filtered, separated, washed and dried to obtain white powder. Under the irradiation of a 365nm ultraviolet lamp, blue and red fluorescence is emitted.
Example 2 ultraviolet magenta + blue Mg 6 (Y 1.8 Eu 0.1 Dy 0.1 )(HO) 16 CO 3 And (3) fluorescent powder.
Solution A: na (Na) 2 CO 3 (3 mmol) + NaOH (7 mmol) +6ml of water
Solution B: mg (NO) 3 ) 2 (6mmol)+Y(NO 3 ) 3 (1.8mol)+Eu(NO 3 ) 3 (0.1mmol)+Dy(NO 3 ) 3 (0.1 mmol) +10ml of water.
Solution C: 20ml of water. A and B were added dropwise to the solution C with rapid stirring to give a white precipitate. The solution pH =10 was controlled with NaOH. After the completion of the dropwise addition, the reaction was continued for 3 hours. The reaction product is filtered, separated, washed and dried to obtain white powder. Under the irradiation of ultraviolet light of 200-400nm, red and blue fluorescence is emitted.
Example 3 ultraviolet magenta + blue Mg 6 (La 1.7 Eu 0.2 Dy 0.1 )(HO) 16 CO 3 And (3) fluorescent powder.
Solution A: na (Na) 2 CO 3 (3 mmol) + NaOH (7 mmol) +6ml of water
Solution B: mg (NO) 3 ) 2 (6mmol)+La(NO 3 ) 3 (1.7mol)+Eu(NO 3 ) 3 (0.2mmol)+Dy(NO 3 ) 3 (0.1 mmol) +10ml of water.
Solution C: 20ml of water. A and B were added dropwise to the solution C with rapid stirring to give a white precipitate. The solution pH =10 was controlled with NaOH. After the completion of the dropwise addition, the reaction was continued for 3 hours. The reaction product is filtered, separated, washed and dried to obtain white powder. Under the irradiation of 365nm ultraviolet lamp, red and blue fluorescence is emitted.
Example 4 ultraviolet magenta Mg 6 (Gd 1.0 Eu 0.5 Dy 0.5 )(HO) 16 CO 3 And (3) fluorescent powder.
Solution A: na (Na) 2 CO 3 (3 mmol) + NaOH (7 mmol) +6ml of water
Solution B: mg (NO) 3 ) 2 (6mmol)+Gd(NO 3 ) 3 (1.0mol)+Eu(NO 3 ) 3 (0.5mmol)+Dy(NO 3 ) 3 (0.5 mmol) +10ml of water.
Solution C: 20ml of water. A and B were added dropwise to the solution C with rapid stirring to give a white precipitate. The solution pH =10 was controlled with NaOH. After the completion of the dropwise addition, the reaction was continued for 3 hours. The reaction product is filtered, separated, washed and dried to obtain white powder. Under the irradiation of ultraviolet light of 200-400nm, red and blue fluorescence is emitted.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (4)
1. A light conversion film comprises agricultural fluorescent light conversion powder which can convert ultraviolet light into red light and blue light dual-band emission, and the chemical general formula of the agricultural fluorescent light conversion powder is Mg 6 RE 2 (HO) 16 CO 3 Wherein RE is rare earth Y 3+ ，La 3+ ，Gd 3+ ，Eu 3+ And Dy 3 + One or more combinations of;
the preparation method of the fluorescent light conversion powder comprises the following steps:
separately preparing Mg 2+ /RE 3+ Mixed aqueous solution of (3), and Na 2 CO 3 The two solutions are slowly dripped into a certain amount of water, the pH is controlled to be =10 by using NaOH, and a precipitate is obtained, namely the fluorescent light-converting powder is obtained; also comprises the steps of washing and drying the precipitate.
2. The light conversion film of claim 1, wherein ultraviolet light from natural light is absorbed and converted to red and blue light.
3. The light conversion film of claim 2, wherein the ultraviolet absorption rate is 98% or more.
4. Use of the light conversion film of claim 1 as an agricultural film.
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| CN202011367746.8A CN112322291B (en) | 2020-11-27 | 2020-11-27 | Dual-waveband agricultural greenhouse film fluorescent light conversion powder and preparation method thereof |
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| CN202011367746.8A CN112322291B (en) | 2020-11-27 | 2020-11-27 | Dual-waveband agricultural greenhouse film fluorescent light conversion powder and preparation method thereof |
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| CN112322291B true CN112322291B (en) | 2023-03-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1176182C (en) * | 2000-08-10 | 2004-11-17 | 上海师范大学 | Multi-kernel rare-earth light-converting powder, its preparing process and its application |
| CN1491973A (en) * | 2002-10-21 | 2004-04-28 | 北京工商大学 | Rare-earth organic compounding type light converting agent for agriculture film and its preparing method |
| CN101250409A (en) * | 2007-12-14 | 2008-08-27 | 福建师范大学 | Rear earth containing hydrotalcite having high fluorescence and preparation method thereof |
| CN101280188A (en) * | 2008-05-23 | 2008-10-08 | 上海师范大学 | Rare earth blue red light conversion material and preparation thereof |
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Effective date of registration: 20230801 Address after: 113, Building B, Haihe Emergency Industrial Park, No. 112 Nanhuan Road, Xianshuigu Town, Jinnan District, Tianjin, 300000 Patentee after: Tianjin Saiwei Sunshine New Materials Co.,Ltd. Address before: No.19, Yanjia Road, Jixia street, Linzi District, Zibo City, Shandong Province, 255400 Patentee before: Cui Mingbin |