CN112538257B - Light conversion film for glass greenhouse capable of promoting plant growth and preparation method thereof - Google Patents
Light conversion film for glass greenhouse capable of promoting plant growth and preparation method thereof Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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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
Abstract
The invention discloses a light conversion film for a glass greenhouse capable of promoting rapid growth of plants and a preparation method thereof1‑xCex）3Al5O12Phosphor powder, Ca1‑ySryAlSiN3：0.015Eu2+Phosphor and (Al)1‑cGac)2O3：zCr3+Mixing the fluorescent powder in a certain proportion, and exciting the mixed powder by blue-violet light and green light to obtain the fluorescent powder Ca1‑ySryAlSiN3：0.015Eu2+Emitting red orange light with main peak wavelength of 660nm, and fluorescent powder (Y)1‑xCex）3Al5O12The green light emitted is just emitted by the fluorescent powder (Al)1‑cGac)2O3：zCr3+Absorbing and emitting deep red light with main peak wavelength of 693nm, and finally enabling the fluorescent powder combination to emit combined spectra with main peak wavelengths of 660nm and 693nm respectively, so that strong red emission is generated, and the light conversion effect is realized. The fluorescent powder in the light conversion film can be used for being irradiated by sunlightThe red orange light is emitted by excitation, and the growth of plants can be promoted. The light conversion film prepared by the method has good tensile property and is not easy to damage, and when the light conversion film is used, the SMC composite material coating of the light conversion film is taken off from the PET base film and is attached to the outer surface of a glass greenhouse.
Description
Technical Field
The invention belongs to the technical field of light conversion materials, and particularly relates to a light conversion film for a glass greenhouse, which can promote plant growth.
Background
In the field of agricultural technology, crop mulch films are widely used because they help the growth of crops and have the characteristics of moisture retention and heat preservation. The currently used covering film has great limitation, because most crops absorb red light more obviously, but the sunlight has less red light, so the crops have lower sunlight utilization rate, and on the basis, the film with the sunlight conversion characteristic is produced at the right moment.
The film having the property of converting sunlight is called a light conversion film or a light conversion film, and the most used light conversion film is a greenhouse covering film at present. But common big-arch shelter is mostly frame tectorial membrane structure, uses the skeleton of bamboo structure or steel construction promptly, covers the one deck and changes membrane on the skeleton. This frame tectorial membrane structure builds the process loaded down with trivial details, and life is short, and vegetation is a long period's process, and the light film receives the influence of environment easily and produces the damage in this process.
The glass greenhouse is a greenhouse which takes glass as a main light-transmitting material, has good light transmission and sealing performance, and has heat insulation on walls. The greenhouse adopts a hot galvanizing steel frame, and is firm, durable, wind-resistant and strong in pressure resistance.
Due to the design of the large-span vertex, the indoor operation space is large, and the greenhouse utilization rate is high. However, the seedling growing glass greenhouse still has the problems of low sunlight utilization rate and the need of supplementing a large amount of light for the grown seedlings in the greenhouse.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a light conversion film for a glass greenhouse, which can promote plant growth.
Another object of the present invention is to provide a method for producing the light conversion film.
In order to achieve the purpose, the invention adopts the following technical scheme:
a light conversion film for glass greenhouse capable of promoting plant growth, which is composed of a PET base film and an SMC composite coating coated on the surface of the base film, wherein the SMC composite coating comprises the following components in parts by weight:
polyurethane: 15-25 parts;
thickening agent: 0.8-1.5 parts;
initiator: 0.2-0.8 part;
a crosslinking agent: 0.6-0.8 part;
internal mold release agent: 0.3-0.6 part;
filling: 18-24 parts;
glass fiber: 3.5-5 parts;
combining fluorescent powder: 0.5-3 parts;
the excitation light wavelength of the phosphor composition is 380-570nm, and comprises a molecular formula (Y)1-xCex）3Al5O12Wherein x is more than or equal to 0.02 and less than or equal to 0.035; a molecular formula of Ca1-ySryAlSiN3：0.015Eu2+The red fluorescent powder R1, wherein y is more than or equal to 0.4 and less than or equal to 0.6; and one kind of a compound represented by the formula (Al)1-cGac)2O3：zCr3+The ruby fluorescent powder R2, wherein c is more than or equal to 0 and less than or equal to 1, and z is more than or equal to 0.008 and less than or equal to 0.012; the ratio of the fluorescent powder is R1 to R2 to Y =1 to a (a + b), wherein a is more than or equal to 0.1 and less than or equal to 0.35, and b is more than or equal to 0.01 and less than or equal to 0.02;
the preparation method of the ruby fluorescent powder R2 comprises the following steps: according to (Al)1-cGac)2O3：zCr3+Molecular formula of the fluorescent powder, aluminum oxide, gallium oxide and chromium oxide are respectively weighed according to stoichiometric ratio, placed in a super mixer, and BaCl accounting for 5 percent of the total weight of the oxides is added2Mixing for 5-10min, pouring the mixture into a corundum crucible, placing the corundum crucible in a muffle furnace, heating to 1580 ℃ at a heating rate of 5 ℃/min, preserving the heat for 5 hours, cooling, taking out, cleaning with pure water until the conductivity is less than 10 mu s/cm, dehydrating, drying and sieving to obtain the ruby fluorescenceAnd (5) light powder R2.
Further, the emission spectrum of the phosphor combination is a combined spectrum having main peak wavelengths of 660nm and 693nm, respectively.
The invention relates to a preparation method of a light conversion film for a glass greenhouse, which can promote plant growth, and comprises the following steps:
step one, respectively mixing polyurethane, a thickening agent, an initiator, a cross-linking agent, an internal release agent, a filler and fluorescent powder according to a formula ratio to prepare resin paste;
secondly, taking glass fibers in a formula amount, uniformly dispersing the glass fibers on a PET (polyethylene terephthalate) base film, coating the resin paste on the surface of the PET base film, conveying the PET base film to a compression roller through a conveying belt, forming a sheet and then rolling;
and step three, thickening the sheet at 40-50 ℃ for 5-6 hours to obtain a finished light conversion film.
Preferably, the thickener is active magnesium oxide, the initiator is EVA, the crosslinking agent is diallyl phthalate, the internal mold release agent is magnesium stearate, and the filler is talcum powder.
The invention has the beneficial effects that:
1. the light conversion film of the invention is added with a certain amount of fluorescent powder combination, and the fluorescent powder combination is prepared by mixing (Y)1-xCex）3Al5O12Phosphor powder, Ca1-ySryAlSiN3：0.015Eu2+Phosphor and (Al)1-cGac)2O3：zCr3+The fluorescent powder is mixed according to a certain proportion, and the fluorescent powder Ca is obtained after the mixed powder is excited by blue-violet light and green light in sunlight1-ySryAlSiN3：0.015Eu2+Emitting red orange light with main peak wavelength of 660nm, and fluorescent powder (Y)1-xCex）3Al5O12The green light emitted is just emitted by the fluorescent powder (Al)1-cGac)2O3：zCr3+Absorbing and emitting deep red light with main peak wavelength of 693nm, and finally enabling the fluorescent powder to emit combined spectra with main peak wavelengths of 660nm and 693nm respectively, thereby generating strong red emission and realizingThe light conversion effect is achieved.
2. The phosphor composition of the present invention comprises a single phosphor (Y)1-xCex）3Al5O12、Ca1-ySryAlSiN3：0.015Eu2+And (Al)1-cGac)2O3：zCr3+Green light which can not be absorbed by chlorophyll is converted into red orange light which has obvious influence on plant photosynthesis and photoperiod effect, and the light energy utilization rate of the plant can be obviously improved after the fluorescent powder is combined into a light conversion film, so that the growth of the plant is promoted.
3. The light conversion film prepared by the method has good tensile property and is not easy to damage, and when the light conversion film is used, the SMC composite material coating of the light conversion film is taken off from the PET base film and is attached to the outer surface of a glass greenhouse, so that the light conversion effect can be realized.
Drawings
FIG. 1 is a graph of the emission spectra of yellow phosphor Y of example 1 under excitation of blue light at 450nm for different values of x;
FIG. 2 is the excitation and emission spectrum of the red phosphor R1 in example 2;
FIG. 3 is a graph of the emission spectrum of red phosphor R1 under excitation of 450nm blue light and the excitation spectrum of the phosphor under monitoring of 650nm for different values of y in example 2;
FIG. 4 shows the excitation and emission spectra of the red fluorescent powder R2 in example 3;
FIG. 5 shows Cr in example 33+At a concentration of 1%, different c values are obtained by using XRD patterns of ruby fluorescent powder R2;
FIG. 6 shows Cr in example 33+Graph of the effect of concentration on the intensity of light emitted by the ruby phosphor R2;
FIG. 7 shows Ga in example 33+The influence of the concentration change on the emission peak position of the ruby phosphor R2 is shown;
FIG. 8 is an SEM photograph of the R2 ruby phosphor prepared in example 3;
FIG. 9 is a graph of the excitation spectra of light converting films obtained from the phosphor combinations of examples 4-9;
FIG. 10 is a graph showing an emission spectrum of a light converting film obtained by the phosphor composition of example 4 under an excitation light of 450 nm;
fig. 11 is a schematic representation of light converting film performance.
Detailed Description
The invention is described in detail below with reference to the figures and specific examples.
Example 1
According to (Y)1-xCex）3Al5O12Molecular formula of phosphor, each oxide was weighed with reference to table 1 and BaF of 5% by weight of the total oxide was added2After being mixed evenly by an agate mortar, the mixture is put into a corundum crucible and is placed in a reducing furnace of ammonia decomposition gas with the temperature of 1580 ℃ and the hydrogen concentration of 75 percent for heat preservation for 5 hours. And cooling and taking out to obtain yellow fluorescent powder Y, wherein the emission spectrogram of the yellow fluorescent powder Y under the excitation of 450nm blue light is shown in figure 1.
TABLE 1 amount (g) of each oxide used in preparing yellow phosphor Y
Example 2
According to (Ca)1-YSrY）AlSiN3:0.015Eu2+The molecular formula of the phosphor was determined by weighing each oxide in a glove box according to Table 2, mixing the oxides uniformly in an agate mortar, placing the mixture in a molybdenum crucible, and maintaining the temperature in a carbon canister furnace at 1800 ℃ and a pressure of 0.6MPa for 5 hours in a nitrogen atmosphere. And taking out after cooling to obtain the red fluorescent powder R1, wherein excitation and emission spectrograms of the red fluorescent powder R1 are shown in figure 2, emission spectrograms of the red fluorescent powder R1 with different y values under the excitation of blue light with the wavelength of 450nm and excitation spectrograms of the fluorescent powder under the monitoring of 650nm are shown in figure 3.
TABLE 2 amount (g) of each oxide used for preparing red phosphor R1
Example 3
According to (Al)1-cGac)2O3：zCr3+Molecular formula of phosphor, alumina, gallium oxide and chromium oxide were weighed in stoichiometric ratio with reference to table 3, respectively, and placed in a super mixer, and BaCl was added in an amount of 5% by weight based on the total weight of the above oxides2Mixing for 5-10min as a fluxing agent, pouring the mixed material into a corundum crucible, placing the corundum crucible into a muffle furnace, heating to 1580 ℃ at 1500-. The excitation and emission spectra are shown in FIG. 4, Cr3+The XRD patterns of the series of ruby phosphors R2 with different c values at 1% are shown in FIG. 5, and the results show that the method of example 3 successfully produces ruby phosphor R2. When the expression of the ruby phosphor R2 is Al2O3：zCr3+In time, Cr3+The effect of concentration on the intensity of the emitted light from R2 is shown in FIG. 6, where the results indicate when Cr is present3+When the concentration is 1%, the light intensity of the fluorescent powder is highest. When Cr is present3+At a concentration of 1%, Ga3+The effect of the concentration change on the emission peak position of the ruby phosphor R2 is shown in FIG. 7, which shows that with Ga3+The emission peak position of R2 can generate blue shift when the concentration changes. The SEM spectrum of the prepared ruby phosphor R2 is shown in FIG. 8.
TABLE 3 amount (g) of each oxide used in preparing ruby phosphor R2
Example 4
15 parts of polyurethane, 1 part of active magnesium oxide, 0.4 part of EVA (ethylene vinyl acetate), 0.6 part of diallyl phthalate, 0.6 part of magnesium stearate, 20 parts of talcum powder and 0.5 part of fluorescent powder combination (R13: R23: Y1=1:0.1: 0.11) are mixed according to the formula amount to prepare resin paste; taking 3.5 parts of glass fiber, uniformly dispersing the glass fiber on a PET (polyethylene terephthalate) base film, coating the resin paste on the surface of the PET base film, conveying the PET base film to a press roller through a conveying belt, forming a sheet, and rolling; and thickening the rolled sheet at 40 ℃ for 6 hours to obtain a finished light conversion film. The excitation spectrum of the light conversion film is shown in FIG. 9, the emission spectrum under 450nm excitation light is shown in FIG. 10, and the tensile strength of the light conversion film is 163 MPa.
The results in fig. 9-10 show that the light conversion film prepared by adding the combination of the fluorescent powder of the invention can absorb blue-violet light and green light in sunlight and emit red orange light with main peak wavelengths of 660nm and 693nm, and the red orange light can be absorbed by plants, thereby promoting the growth of the plants.
Example 5
18 parts of polyurethane, 1.2 parts of active magnesium oxide, 0.6 part of EVA (ethylene vinyl acetate), 0.6 part of diallyl phthalate, 0.5 part of magnesium stearate, 20 parts of talcum powder and 1.5 parts of fluorescent powder combination (R13: R23: Y2=1:0.2: 0.215) are mixed according to the formula amount to prepare resin paste; taking 4 parts of glass fiber, uniformly dispersing the glass fiber on a PET (polyethylene terephthalate) base film, coating the resin paste on the surface of the PET base film, conveying the PET base film to a compression roller through a conveyor belt, forming a sheet, and then rolling; and thickening the rolled sheet at 50 ℃ for 5 hours to obtain a finished light conversion film. The excitation spectrum of this light conversion film is shown in FIG. 9, and the tensile strength of the light conversion film is 165 MPa.
Example 6
20 parts of polyurethane, 0.8 part of active magnesium oxide, 0.2 part of EVA (ethylene vinyl acetate), 0.7 part of diallyl phthalate, 0.4 part of magnesium stearate, 18 parts of talcum powder and 2 parts of fluorescent powder combination (R14: R25: Y3=1:0.25: 0.265) are mixed according to the formula amount to prepare resin paste; taking 3.5 parts of glass fiber, uniformly dispersing the glass fiber on a PET (polyethylene terephthalate) base film, coating the resin paste on the surface of the PET base film, conveying the PET base film to a press roller through a conveying belt, forming a sheet, and rolling; and thickening the rolled sheet at 50 ℃ for 5 hours to obtain a finished light conversion film. The excitation spectrum of the light conversion film is shown in FIG. 9, and the tensile strength of the light conversion film is 162 MPa.
Example 7
Mixing 22 parts of polyurethane, 1.5 parts of active magnesium oxide, 0.8 part of EVA (ethylene vinyl acetate), 0.8 part of diallyl phthalate, 0.6 part of magnesium stearate, 22 parts of talcum powder and 2.5 parts of fluorescent powder combination (R12: R27: Y4=1:0.27: 0.29) according to the formula ratio to prepare resin paste; taking 4.5 parts of glass fiber, uniformly dispersing the glass fiber on a PET (polyethylene terephthalate) base film, coating the resin paste on the surface of the PET base film, conveying the PET base film to a compression roller through a conveying belt, forming a sheet and then rolling; thickening the rolled sheet at 40 ℃ for 5.5 hours to obtain a finished light conversion film. The excitation spectrum of the light conversion film is shown in FIG. 9, and the tensile strength of the light conversion film is 168 MPa.
Example 8
Mixing 25 parts of polyurethane, 1.5 parts of active magnesium oxide, 0.6 part of EVA (ethylene vinyl acetate), 0.8 part of diallyl phthalate, 0.3 part of magnesium stearate, 24 parts of talcum powder and 3 parts of fluorescent powder combination (R11: R26: Y4=1:0.3: 0.32) according to the formula ratio to prepare resin paste; taking 5 parts of glass fiber, uniformly dispersing the glass fiber on a PET (polyethylene terephthalate) base film, coating the resin paste on the surface of the PET base film, conveying the PET base film to a compression roller through a conveyor belt, forming a sheet, and then rolling; and thickening the rolled sheet at 50 ℃ for 5 hours to obtain a finished light conversion film. The excitation spectrum of the light conversion film is shown in FIG. 9, and the tensile strength of the light conversion film is 170 MPa.
Example 9
Mixing 18 parts of polyurethane, 1 part of active magnesium oxide, 0.4 part of EVA (ethylene vinyl acetate), 0.7 part of diallyl phthalate, 0.4 part of magnesium stearate, 18 parts of talcum powder and 1 part of fluorescent powder combination (R13: R23: Y5=1:0.35: 0.37) according to the formula ratio to prepare resin paste; taking 4 parts of glass fiber, uniformly dispersing the glass fiber on a PET (polyethylene terephthalate) base film, coating the resin paste on the surface of the PET base film, conveying the PET base film to a compression roller through a conveyor belt, forming a sheet, and then rolling; and thickening the rolled sheet at 40 ℃ for 6 hours to obtain a finished light conversion film. The excitation spectrum of the light conversion film is shown in FIG. 9, and the tensile strength of the light conversion film is 166 MPa.
The data show that the light conversion film prepared by the method has good tensile property, when in use, the SMC composite material coating is peeled off from the PET base film and is attached to the outer surface of the glass greenhouse, and the size of the film can be selected according to the span size of the glass greenhouse and the actual requirement. The performance of the light conversion film is schematically shown in fig. 11.
Claims (4)
1. A light conversion film for a glass greenhouse capable of promoting plant growth, which consists of a PET base film and an SMC composite coating coated on the surface of the base film, and is characterized in that the SMC composite coating comprises the following components in parts by weight:
polyurethane: 15-25 parts;
thickening agent: 0.8-1.5 parts;
initiator: 0.2-0.8 part;
a crosslinking agent: 0.6-0.8 part;
internal mold release agent: 0.3-0.6 part;
filling: 18-24 parts;
glass fiber: 3.5-5 parts;
fluorescent powder combination: 0.5-3 parts;
the excitation wavelength of the fluorescent powder combination is 380-570nm and comprises a molecular formula of (Y)1-xCex）3Al5O12Wherein x is more than or equal to 0.02 and less than or equal to 0.035; ca is a molecular formula1-ySryAlSiN3：0.015Eu2+The red fluorescent powder R1, wherein y is more than or equal to 0.4 and less than or equal to 0.6; and one kind of a compound represented by the formula (Al)1-cGac)2O3：zCr3+The ruby fluorescent powder R2, wherein c is more than or equal to 0 and less than or equal to 1, and z is more than or equal to 0.008 and less than or equal to 0.012; the ratio of the phosphors is R1 to R2 to Y =1 to a (a + b), wherein a is more than or equal to 0.1 and less than or equal to 0.35, and b is more than or equal to 0.01 and less than or equal to 0.02;
the preparation method of the ruby fluorescent powder R2 comprises the following steps: according to (Al)1-cGac)2O3：zCr3+Molecular formula of the fluorescent powder, aluminum oxide, gallium oxide and chromium oxide are respectively weighed according to stoichiometric ratio, placed in a super mixer, and BaCl accounting for 5 percent of the total weight of the oxides is added2Mixing for 5-10min, then pouring the mixed material into a corundum crucible, placing the corundum crucible into a muffle furnace, heating to 1580 ℃ at the temperature of 1500-.
2. The light conversion film for a glass greenhouse capable of promoting plant growth according to claim 1, wherein: the emission spectrum of the fluorescent powder combination is a combined spectrum with main peak wavelengths of 660nm and 693nm respectively.
3. A method for producing a light conversion film for a glass greenhouse capable of promoting plant growth as claimed in claim 1 or 2, comprising the steps of:
firstly, respectively mixing polyurethane, a thickening agent, an initiator, a cross-linking agent, an internal release agent, a filler and fluorescent powder according to the formula ratio to prepare resin paste,
secondly, taking glass fibers in a formula amount, uniformly dispersing the glass fibers on a PET (polyethylene terephthalate) base film, coating the resin paste on the surface of the PET base film, conveying the PET base film to a compression roller through a conveying belt, forming a sheet and then rolling;
and step three, thickening the sheet at 40-50 ℃ for 5-6 hours to obtain a finished light conversion film.
4. The method for producing a light conversion film for a glass greenhouse capable of promoting plant growth as claimed in claim 3, wherein: the thickening agent is active magnesium oxide, the initiator is EVA, the cross-linking agent is diallyl phthalate, the internal mold release agent is magnesium stearate, and the filler is talcum powder.
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