Preparation method of light conversion film

Abstract

The invention discloses a preparation method of a light conversion film, which comprises the following steps: step 1, mixing a light conversion material with a solvent to obtain a light conversion material solution with solid content of 5-20 mg / ml, the light conversion material being a barbituric acid organic compound with an aromatic amine structure unit; 2, arranging the light conversion material solution on the film main body through a patterning process; and 3, heating the product obtained in the step 2 to obtain the light conversion film. The solvent is at least one of methylbenzene, chlorobenzene, dimethyl sulfoxide, tetrahydrofuran, chloroform and butyl benzoate. The film main body is prepared from one or more of polyvinyl chloride, polyethylene, polypropylene and ethylene-vinyl acetate copolymer. According to the invention, the patterned light conversion film is formed on the film main body by the light conversion material through a printing / coating method; the light conversion film can make full use of solar energy resources with the wave band of 510 nm to 550 nm, and is suitable for being popularized and applied to crop growth.

Description

Technical Field

[0001] This invention relates to a method for preparing a membrane, specifically a method for preparing a light conversion membrane. Background Technology

[0002] A light conversion film is a thin film that achieves light conversion by adding light conversion materials. It not only converts ultraviolet light—which is detrimental to plant growth—into visible light that is beneficial to plants, but also converts yellow-green light into red-orange light, effectively optimizing the light quality received by plants. This conversion not only optimizes the quality of light passing through the film but also significantly improves the absorption efficiency of key mineral elements such as potassium, nitrogen, phosphorus, and zinc by plants. Through this improvement in light quality, the leaf spread and area of ​​plants are significantly increased, along with plant height and petiole length. This increases the chlorophyll content in the leaves, enhances the efficiency of photosynthesis, and thus achieves a significant increase in crop yield.

[0003] The manufacture of light conversion films currently relies on a variety of light conversion materials, which are mainly divided into three categories: rare earth complexes, organic dyes and inorganic salts. During use, they have disadvantages such as low luminous efficiency, easy aggregation, difficulty in film formation and high price.

[0004] In summary, light conversion membrane (PDM) technology significantly improves photosynthetic efficiency and crop yield by optimizing the quality of light received by plants. However, the research and application of PDM require a comprehensive consideration of the advantages and disadvantages of various materials. Through modification and precise control, the goal is to achieve high efficiency, low cost, and widespread application of PDM, further promoting crop growth. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a method for preparing a light conversion film that can effectively promote the growth of crops.

[0006] Technical solution: The present invention provides a method for preparing a light conversion film, comprising the following steps:

[0007] Step 1: Mix the light conversion material with a solvent to obtain a light conversion material solution with a solid content of 5 mg / ml to 20 mg / ml. The light conversion material is a barbituric acid organic compound with aromatic amine structural units.

[0008] Step 2: The light conversion material solution is applied to the membrane substrate using a patterning process;

[0009] Step 3: Heat the material obtained in Step 2 to obtain a light conversion film.

[0010] Furthermore, in step one, the structural formula of the light conversion material is:

[0011]

[0012] Furthermore, in step one, the solvent is at least one of toluene, chlorobenzene, dimethyl sulfoxide, tetrahydrofuran, chloroform, and butyl benzoate.

[0013] Further, in step two, the membrane substrate is made of one or more of polyvinyl chloride, polyethylene, polypropylene, and ethylene-vinyl acetate copolymer. The membrane substrate has a length of 20–30 cm, a width of 30–100 cm, and a thickness of 1–2 mm. The patterning process can be any one of inkjet printing, electrohydraulic printing, spraying, printing, or coating. The patterning process is repeated 5–15 times.

[0014] Furthermore, in step three, the heating temperature is 80℃~190℃, and the heating time is 20min~60min.

[0015] Furthermore, the light conversion film can absorb green light in the range of 510nm to 550nm and emit red and orange light in the range of 600nm to 750nm.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant features: a novel light conversion film with patterned structure is formed by printing / coating a light conversion material onto the film body, wherein the light conversion material is a barbituric acid organic compound with aromatic amine structural units; the light conversion film can absorb green light in the range of 510nm to 550nm and emit red-orange light in the range of 600nm to 750nm. The light conversion film can make full use of solar energy resources in the 510nm to 550nm wavelength band and is suitable for promotion and application in crop growth. Attached Figure Description

[0017] Figure 1 This is a flowchart of the preparation process of the present invention. Detailed Implementation

[0018] Example 1

[0019] In this embodiment, a 30cm*30cm*1mm polyethylene film is used as the main body for the light conversion film. The chemical structural formula of the light conversion material used is:

[0020]

[0021] like Figure 1 A method for preparing a light conversion film includes the following steps:

[0022] First, the above-mentioned light conversion material was added to a mixture of 5 vol.% toluene, 5 vol.% dimethyl sulfoxide, and 90 vol.% butyl benzoate at a solid content of 5 mg / ml and mixed thoroughly. A 10 cm * 10 cm rectangular light conversion pattern was then printed onto the film substrate using inkjet printing technology, repeating the printing 15 times. Next, the printed film was heated to 190°C and maintained for 60 minutes. After removing the solvent, a light conversion film with a uniform pattern was obtained.

[0023] The light conversion film obtained in this embodiment has an average transmittance of about 75% in the 510nm to 540nm wavelength range, and the main emission peak is located at 650nm. Therefore, it can absorb green light in the 510nm to 550nm range and emit red-orange light in the 600nm to 750nm range, thereby achieving the purpose of converting green light into red-orange light and promoting crop growth.

[0024] Example 2

[0025] In this embodiment, a 30cm*50cm*2mm polyvinyl chloride film is used as the main body for the light conversion film. The chemical structural formula of the light conversion material used is:

[0026]

[0027] A method for preparing a light conversion film includes the following steps:

[0028] First, the aforementioned light conversion material was added to a mixture of 3 vol.% tetrahydrofuran, 5 vol.% chloroform, and 92 vol.% butyl benzoate at a solid content of 10 mg / ml and mixed thoroughly. Using electrohydraulic printing technology, two circular light conversion pattern areas, each 10 cm in diameter and spaced 15 cm apart, were printed on the film substrate. This process was repeated 13 times. Then, the printed film was heated to 160°C and maintained for 45 minutes to obtain a light conversion film with a uniform pattern.

[0029] The light conversion film obtained in this embodiment has an average transmittance of about 68% in the 510nm to 540nm wavelength band, and the main emission peak is located at 681nm. Therefore, it can absorb green light in the 510nm to 550nm range and emit red-orange light in the 600nm to 750nm range, thereby achieving the purpose of converting green light into red-orange light and promoting crop growth.

[0030] Example 3

[0031] In this embodiment, the light conversion film uses 20cm*80cm*1mm polypropylene as the main body, and the light conversion material used is the same as in Example 1.

[0032] A method for preparing a light conversion film includes the following steps:

[0033] First, the light conversion material was added to 30 vol.% chlorobenzene and 70 vol.% dimethyl sulfoxide at a solid content of 20 mg / ml and mixed thoroughly. A circular pattern area with a diameter of 15 cm was then sprayed onto the film substrate using a spraying process. A square light conversion pattern area of ​​15 cm x 15 cm was then sprayed at a 20 cm interval, and this process was repeated five times. Next, the sprayed film was heated to 80°C and maintained for 30 minutes to obtain a light conversion film with a uniform pattern.

[0034] The light conversion film obtained in this embodiment has an average transmittance of about 50% in the 510nm to 540nm wavelength band, and the main emission peak is located at 650nm. Therefore, it can absorb green light in the 510nm to 550nm range and emit red-orange light in the 600nm to 750nm range, thereby achieving the purpose of converting green light into red-orange light and promoting crop growth.

[0035] Example 4

[0036] In this embodiment, the light conversion film uses ethylene-vinyl acetate copolymer with a thickness of 30cm*100cm*1mm as the main body, and the light conversion material is the same as in Example 1.

[0037] A method for preparing a light conversion film includes the following steps:

[0038] First, the light conversion material was added to a mixed solution of 30 vol.% chlorobenzene, 60 vol.% dimethyl sulfoxide, and 10 vol.% tetrahydrofuran at a solid content of 15 mg / ml and mixed thoroughly. The mixture was then sprayed onto the substrate in a 30cm x 80cm rectangular area, repeated twice. Next, a 30cm x 60cm rectangular area was sprayed onto the 30cm x 80cm area, repeated twice. Then, a 30cm x 40cm rectangular area was sprayed onto the 30cm x 60cm area, repeated twice. Finally, a 30cm x 20cm rectangular area was sprayed onto the 30cm x 40cm area, repeated twice. The coated film was then heated to 120°C and maintained for 20 minutes to obtain a light conversion film with a gradual change in transmittance.

[0039] The light conversion film obtained in this embodiment has an average transmittance that gradually decreases from 100% in the unpatterned region to 65% in the 510nm to 540nm wavelength range, with the main emission peak of the patterned region located at 650nm. Thus, it can absorb green light in the 510nm to 550nm range and emit red-orange light in the 600nm to 750nm range, thereby achieving the purpose of converting green light into red-orange light and promoting crop growth.

Claims

1. A method for preparing a light conversion film, characterized in that, Includes the following steps: Step 1: Mix the light conversion material with a solvent to obtain a light conversion material solution with a solid content of 5 mg / ml to 20 mg / ml. The light conversion material is a barbituric acid organic compound with aromatic amine structural units. Step 2: The light conversion material solution is applied to the membrane substrate using a patterning process; Step 3: Heat the material obtained in Step 2 to obtain a light conversion film.

2. The method for preparing a light conversion film according to claim 1, characterized in that: In step one, the structural formula of the light conversion material is:

3. The method for preparing a light conversion film according to claim 1, characterized in that: In step one, the solvent is at least one of toluene, chlorobenzene, dimethyl sulfoxide, tetrahydrofuran, chloroform, and butyl benzoate.

4. The method for preparing a light conversion film according to claim 1, characterized in that: In step two, the membrane body is made of one or more of polyvinyl chloride, polyethylene, polypropylene, and ethylene-vinyl acetate copolymer.

5. The method for preparing a light conversion film according to claim 1, characterized in that: In step two, the length of the membrane body is 20-30cm, the width is 30-100cm, and the thickness is 1-2mm.

6. The method for preparing a light conversion film according to claim 1, characterized in that: In step two, the patterning process can be any one of inkjet printing, electrothermal printing, spraying, printing, or coating.

7. The method for preparing a light conversion film according to claim 6, characterized in that: In step two, the patterning process is repeated 5 to 15 times.

8. The method for preparing a light conversion film according to claim 1, characterized in that: In step three, the heating temperature is 80℃~190℃.

9. The method for preparing a light conversion film according to claim 1, characterized in that: In step three, the heating time is 20 min to 60 min.

10. The method for preparing a light conversion film according to claim 1, characterized in that: The light conversion film can absorb green light in the range of 510nm to 550nm and emit red-orange light in the range of 600nm to 750nm.

Images