PET light conversion curtain and preparation method thereof

Abstract

The invention provides a PET light conversion curtain and a preparation method thereof, and belongs to the technical field of agricultural high-molecular compound materials. A PET light conversion curtain is provided with a single-layer net-shaped weaving structure. The PET light conversion curtain strip is prepared from the following raw materials: matrix PET resin, bis (dioctyl pyrophosphate acyloxy) ethylene titanate, 2-seleno-3-methylbenzothiazole, polycarbonate, a light conversion functional master batch, a plasticizer and a lubricant; the master batch with the light conversion function is prepared from the following raw materials: nanocrystallized 1, 7-bis (4-biphenyl)-N, N '-bis (perfluorotrihexylamino) perylene diimide, polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol ester and europium trichloride; the nanocrystallized 1, 7-bis (4-biphenyl)-N, N '-bis (perfluorotrihexylamino) perylene diimide is prepared from the following raw materials: 1, 7-dibromo-3, 4, 9, 10-perylenetetracarboxylic dianhydride, perfluorotrihexylamine and 4-biphenylboronic acid. According to the PET light conversion curtain provided by the invention, the O2 and CO2 transmission coefficients of the material are low, and the photosynthesis efficiency of crops can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural polymer compound materials, and in particular to a PET light-converting curtain and a preparation method thereof. Background Art

[0002] In agricultural production, lighting conditions play a crucial role in the growth and development of crops. Sunlight contains multiple wavelengths of light, but plants utilize different wavelengths differently during photosynthesis. Plants generally have low utilization rates of green and violet light, while red and blue light are key wavelengths required for photosynthesis. Traditional agricultural covering materials are unable to effectively adjust the sunlight spectrum, resulting in low light energy utilization, which limits the improvement of crop yield and quality.

[0003] The emergence of light-conversion films offers a solution to this problem. By adding a light-conversion agent, the inefficiently utilized wavelengths of sunlight can be converted to the efficient wavelengths required by plants, thereby enhancing plant photosynthesis. However, existing light-conversion agents present numerous challenges. Some have low light-conversion efficiencies, failing to fully meet plant growth requirements. Others exhibit poor stability and are susceptible to degradation under the influence of environmental factors such as light and temperature, leading to a decrease in light-conversion performance. Furthermore, light-conversion agents lack compatibility with substrates, leading to agglomeration during processing and compromising overall material performance.

[0004] PET is widely used in agricultural film. While it possesses excellent mechanical and optical properties, it has a limited permeability to oxygen and carbon dioxide. In applications involving light-converting film, the permeation of oxygen and carbon dioxide accelerates the aging of the light-converting agent, shortening the film's lifespan and increasing agricultural production costs. Summary of the Invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a PET light-converting curtain and achieves the following invention objectives: to solve the problems of low light conversion efficiency and poor stability of existing light-converting films and high oxygen and carbon dioxide transmittance of PET materials, and to provide a PET light-converting curtain with high light conversion rate, high oxidation resistance and the ability to effectively reduce oxygen and carbon dioxide transmittance, and a preparation method thereof.

[0006] To achieve the above objectives, the technical solutions adopted are as follows: The present invention provides a PET light-converting curtain. The raw materials for preparing the curtain include, by weight, 90-115 parts of a base PET resin, 3-6 parts of bis(dioctylpyrophosphate)ethylene titanate, 2-5 parts of 2-seleno-3-methylbenzothiazole, 9-16 parts of polycarbonate, 12-20 parts of a light-converting masterbatch, 4-7 parts of a plasticizer, and 3-7 parts of a lubricant.

[0007] As a preferred embodiment, the matrix PET resin is one or a combination of polyethylene terephthalate, polyethylene naphthalate, polyethylene furandicarboxylate, polyethylene terephthalate-polyethylene 1,4-cyclohexanedicarboxylate; As a preferred embodiment, the base PET resin is polyethylene terephthalate.

[0008] The lubricant is one or a combination of stearic acid, zinc stearate, lead stearate, magnesium stearate, barium stearate, cadmium stearate, aluminum stearate, sodium stearate, stearic acid diglyceride, stearic acid triglyceride, oleamide, stearic acid amide, ethylene bisstearamide, and ethylene bisoleamide.

[0009] As a preferred embodiment, the lubricant is ethylene bisoleamide.

[0010] The plasticizer is one or a combination of dioctyl adipate, dibutyl phthalate, dioctyl phthalate, glutaric acid ester, adipate, azelaic acid ester, sebacate, trimellitic anhydride, epoxidized soybean oil, epoxidized linseed oil, and castor oil.

[0011] As a preferred embodiment, the plasticizer is epoxidized linseed oil.

[0012] The light-conversion functional masterbatch is prepared from raw materials, in parts by weight, including: 3 to 7 parts of nano-1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, 10 to 18 parts of polyethylene terephthalate-1,4-cyclohexanedimethanol (PETG), and 1 to 4 parts of europium trichloride (EuCl3).

[0013] The nano-sized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide is prepared from the following raw materials in parts by weight: 10-15 parts of 1,7-dibromo-3,4,9,10-perylenetetracarboxylic dianhydride (1,7-dibromo-PTCDA), 25-32 parts of perfluorotrihexylamine, and 19-24 parts of 4-biphenylboric acid.

[0014] The present invention also provides a method for preparing a PET light-converting curtain, comprising the following steps: 1. Preparation of light-converting functional masterbatch 1. Under argon protection, dissolve 1,7-dibromo-PTCDA and perfluorotrihexylamine in DMF, add imidazole and reflux for 8-12 hours at 140-150°C. After 8-12 hours of reaction, pour the reaction solution into ice-cold ethanol at <-5°C for precipitation. Centrifuge and collect the solid; wash the solid with acetone and n-hexane, then vacuum dry to obtain N,N'-bis(perfluorotrihexylamino)-1,7-dibromoperylene diimide.

[0015] DMF as a solvent does not participate in the reaction, and its usage is 5 times the mass of perfluorotrihexylamine; imidazole as a catalyst, and its usage is 0.2-0.5% of the mass of perfluorotrihexylamine.

[0016] 2. Add N,N'-bis(perfluorotrihexylamino)-1,7-dibromoperylene diimide and 4-biphenylboronic acid to a toluene / ethanol mixture, then add FeCl3 / IMes.HCl catalyst. Use a 2 mol / L K2CO3 solution as the auxiliary aqueous phase and stir the reaction for 12-16 hours at 90-95°C. After 12-16 hours, stop stirring and allow the two phases to separate. Retain the upper organic phase. Wash the upper organic phase with water and rotary evaporate to obtain the solid product, 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide. The rotary evaporation temperature is 50°C and the vacuum is less than -0.08 MPa.

[0017] The toluene / ethanol mixed solvent has a mass ratio of toluene to ethanol of 4:1. The toluene / ethanol mixed solvent and the K2CO3 solution do not participate in the reaction; both are used in equal amounts, each 5 times the mass of perfluorotrihexylamine. The FeCl3 / IMes.HCl catalyst is used in an amount of 0.4-0.9% of the mass of 4-biphenylboronic acid. The FeCl3 / IMes.HCl catalyst comprises FeCl3 and 1,3-bis(2,4,6-trimethylphenyl)imidazolium chloride, with a mass ratio of FeCl3 to 1,3-bis(2,4,6-trimethylphenyl)imidazolium chloride of 1:2.1-3.8.

[0018] 3. The 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide obtained by the above reaction is dissolved in supercritical CO2, and the pressure is suddenly reduced to normal pressure through a flow-limiting nozzle, and the nanoparticles are collected. After drying, nanosized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide is finally obtained.

[0019] 4. Melt and knead the nano-sized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, PETG, and EuCl3 for 20-30 minutes at a kneading temperature of 255-265°C, and obtain the light conversion functional masterbatch after granulation and drying.

[0020] 2. Preparation of PET light-converting curtain strips The PET matrix resin, bis(dioctylpyrophosphate)ethylene titanate, 2-seleno-3-methylbenzothiazole, polycarbonate, a light-converting masterbatch, a plasticizer, and a lubricant were mixed uniformly and fed into a twin-screw extruder to produce a light-converting curtain strip. The extruder was controlled at a die temperature of 260-275°C, a screw speed of 300 r / min, and an extrusion pressure of 19-22 MPa. The thickness of the light-converting curtain strip was 0.05 mm.

[0021] 3. Woven curtain The light-converting curtain strips are introduced into the weaving equipment for grid weaving. By adjusting the parameters of the weaving equipment, PET light-converting curtains with different pore sizes can be obtained.

[0022] The beneficial effects of the present invention are as follows: Through the unique design of a light-converting masterbatch and the compounding of raw materials, this invention achieves a tensile strength of 58.6-60.2 MPa for PET light-converting screens, over 30% higher than conventional PET film. The O2 and CO2 transmittance coefficients of the PET light-converting screen strips are over 55% lower than those of conventional PET film, effectively slowing oxidation of the light-converting agent. The 2200-hour weathering tensile retention rate exceeds 89%, effectively extending the service life of the light-converting screens. The PET light-converting screens provided by this invention can significantly improve the photosynthetic efficiency of crops, providing more effective light for their growth. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0024] Example 1 A PET light-converting curtain A PET light-converting curtain is prepared by preparing the following raw materials in parts by weight: 100 parts of a base PET resin, 3 parts of bis(dioctylpyrophosphate)ethylene titanate, 5 parts of 2-seleno-3-methylbenzothiazole, 12 parts of polycarbonate, 14 parts of a light-converting masterbatch, 4 parts of a plasticizer, and 7 parts of a lubricant.

[0025] The base PET resin is polyethylene terephthalate; Plasticizer: epoxy linseed oil; The lubricant is ethylene bisoleamide; The light conversion functional masterbatch is prepared by using the following raw materials in parts by weight: 4 parts of nano-1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, 13 parts of PETG, and 3 parts of EuCl; Nano-sized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide is prepared by preparing raw materials including, by weight, 12 parts of 1,7-dibromo-3,4,9,10-perylenetetracarboxylic dianhydride, 32 parts of perfluorotrihexylamine, and 24 parts of 4-biphenylboric acid.

[0026] A method for preparing a PET light-converting curtain comprises the following steps: Step 1: Prepare light-converting functional masterbatch S1. Under argon protection, dissolve 1,7-dibromo-PTCDA and perfluorotrihexylamine in DMF, add imidazole, and reflux for 8 hours at 140°C. After 8 hours of reaction, pour the reaction solution into ice-cold ethanol at <-5°C for precipitation. Centrifuge and collect the solid; wash the solid with acetone and then n-hexane, then vacuum dry to obtain N,N'-bis(perfluorotrihexylamino)-1,7-dibromoperylene diimide.

[0027] DMF as a solvent does not participate in the reaction, and its usage is 5 times the mass of perfluorotrihexylamine; imidazole as a catalyst, and its usage is 0.3% of the mass of perfluorotrihexylamine.

[0028] S2. Add N,N'-bis(perfluorotrihexylamino)-1,7-dibromoperylene diimide and 4-biphenylboronic acid to a toluene / ethanol mixed solvent. Add FeCl3 / IMes.HCl catalyst and use a 2 mol / L K2CO2 solution as the auxiliary aqueous phase. Stir and react for 12 hours at 95°C. The mass ratio of toluene to ethanol is 4:1. After 12 hours of reaction, stop stirring and allow the two phases to separate. Retain the upper organic phase. Wash the upper organic phase with water and rotary evaporate to obtain a solid product, 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide. The rotary evaporation temperature is 50°C and the vacuum is less than -0.08 MPa.

[0029] The toluene / ethanol mixed solvent and the K2CO3 solution do not participate in the reaction, and the two are used in the same amount, which is 5 times the mass of perfluorotrihexylamine; in the toluene / ethanol mixed solvent, the mass ratio of toluene to ethanol is 4:1; the amount of FeCl3 / IMes.HCl catalyst used is 0.5% of the mass of 4-biphenylboric acid; the raw materials of the FeCl3 / IMes.HCl catalyst include FeCl3 and 1,3-bis(2,4,6-trimethylphenyl)imidazole chloride, and the mass ratio of FeCl3 and 1,3-bis(2,4,6-trimethylphenyl)imidazole chloride is 1:2.1.

[0030] S3. The product obtained from the above reaction was dissolved in supercritical CO2 (35°C, 10 MPa), and the pressure was suddenly reduced to normal pressure through a flow-limiting nozzle, and the nanoparticles were collected. After drying, nanosized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide was finally obtained.

[0031] S4. Melt and knead the nano-sized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, PETG, and EuCl3 for 20 minutes at a kneading temperature of 255° C., and obtain a light-converting functional masterbatch after granulation and drying.

[0032] Step 2: Prepare PET light-converting curtain strips The PET matrix resin, bis(dioctyl pyrophosphate)ethylene titanate, 2-seleno-3-methylbenzothiazole, polycarbonate, a light-converting masterbatch, a plasticizer, and a lubricant were mixed uniformly and fed into a twin-screw extruder to produce a light-converting curtain strip. The extruder die head temperature was controlled at 260°C, the screw speed at 300 r / min, and the extrusion pressure at 19 MPa. The thickness of the light-converting curtain strip was 0.05 mm.

[0033] Step 3: Weaving the curtain The light-converting curtain strips are introduced into a weaving device for mesh weaving to obtain a PET light-converting curtain with a pore size of 0.5 mm.

[0034] Example 2 A PET light-converting curtain A PET light-converting curtain is prepared by preparing raw materials, which include, by weight: 115 parts of a base PET resin, 6 parts of bis(dioctylpyrophosphate)ethylene titanate, 2 parts of 2-seleno-3-methylbenzothiazole, 16 parts of polycarbonate, 12 parts of a light-converting masterbatch, 7 parts of a plasticizer, and 5 parts of a lubricant.

[0035] The base PET resin is polyethylene naphthalate; Plasticizer is dioctyl adipate; The lubricant is triglyceride of stearate; The light-converting functional masterbatch is prepared by using the following raw materials in parts by weight: 7 parts of nano-1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, 18 parts of PETG, and 34 parts of EuCl.

[0036] Nano-sized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, prepared from raw materials including, by weight, 15 parts of 1,7-dibromo-3,4,9,10-perylenetetracarboxylic dianhydride (1,7-dibromo-PTCDA), 30 parts of perfluorotrihexylamine, and 19 parts of 4-biphenylboric acid.

[0037] A method for preparing a PET light-converting curtain comprises the following steps: Step 1: Prepare light-converting functional masterbatch In the S1 operation, the reaction temperature is 150°C, the reflux time is 12h, and the amount of imidazole added is 0.5% of the mass of perfluorotrihexylamine; in the S2 operation, the stirring reaction time is 16h, the reaction temperature is 90°C, and the amount of FeCl3 / IMes.HCl catalyst added is 0.9% of the mass of 4-biphenylboric acid; in the toluene / ethanol mixed solvent, the mass ratio of toluene to ethanol is 6:1; in the FeCl3 / IMes.HCl catalyst, the mass ratio of FeCl3 and 1,3-bis(2,4,6-trimethylphenyl)imidazole chloride is 1:3.8; in the banburying granulation operation, the banburying time is 30min, and the banburying temperature is 265°C; the remaining operations are the same as step 1 of Example 1.

[0038] Step 2: Prepare PET light-converting curtain strips The extruder die head temperature was controlled at 275° C., the extrusion pressure was 22 MPa, and the thickness of the light-converting curtain strip was 0.05 mm. The remaining operations were the same as step 2 of Example 1.

[0039] Step 3: Weaving the curtain The light-converting curtain strips are introduced into a weaving device for mesh weaving to obtain a PET light-converting curtain with a pore size of 0.2 mm.

[0040] Example 3: A PET light-converting curtain A PET light-converting curtain is prepared by preparing raw materials, which include, by weight: 90 parts of a base PET resin, 4 parts of bis(dioctylpyrophosphate)ethylene titanate, 4 parts of 2-seleno-3-methylbenzothiazole, 9 parts of polycarbonate, 20 parts of a light-converting masterbatch, 5 parts of a plasticizer, and 3 parts of a lubricant.

[0041] The base PET resin is polyethylene furandicarboxylate; The plasticizer is dioctyl phthalate; The lubricant is stearic acid diglyceride; The light-converting functional masterbatch is prepared by using the following raw materials in parts by weight: 3 parts of nano-1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, 10 parts of PETG, and 1 part of EuCl3.

[0042] Nano-sized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, prepared from raw materials including, by weight, 10 parts of 1,7-dibromo-3,4,9,10-perylenetetracarboxylic dianhydride (1,7-dibromo-PTCDA), 25 parts of perfluorotrihexylamine, and 22 parts of 4-biphenylboric acid.

[0043] A method for preparing a PET light-converting curtain comprises the following steps: Step 1: Prepare light-converting functional masterbatch In the S1 operation, the reflux time is 12 hours, and the amount of imidazole added is 0.2% of the mass of perfluorotrihexylamine; in the S2 operation, the stirring reaction time is 16 hours, the amount of FeCl3 / IMes.HCl catalyst used is 0.4% of the mass of 4-biphenylboric acid, and the mass ratio of FeCl3 and 1,3-bis(2,4,6-trimethylphenyl)imidazole chloride in the FeCl3 / IMes.HCl catalyst is 1:2.5; in the banburying granulation operation, the banburying time is 30 minutes, and the banburying temperature is 255°C; the remaining operations are the same as step 1 of Example 1.

[0044] Step 2: Prepare PET light-converting curtain strips The extruder die head temperature was controlled at 260° C., the extrusion pressure was 22 MPa, and the thickness of the light-converting curtain strip was 0.05 mm. The remaining operations were the same as step 2 of Example 1.

[0045] Step 3: Weaving the curtain The light-converting curtain strips are introduced into a weaving device for mesh weaving to obtain a PET light-converting curtain with a pore size of 2 mm.

[0046] Performance Testing (1) Material testing The material properties of the PET light-converting curtain strips prepared in Examples 1 to 3 were tested using the following test methods: Mechanical properties: tensile strength and elongation at break are tested according to "Determination of tensile properties of plastics Part 3: Test conditions for film and sheeting" (GB / T1040.3-2006).

[0047] Gas permeability: refer to "Plastic Film and Sheeting Gas Permeability Test Method Pressure Difference Method" (GB / T1038-2000) to test O2 and CO2 permeability coefficients.

[0048] The light conversion effect was measured using a fluorescence spectrometer. The light conversion performance of the light conversion curtains of Examples 1-3 was measured respectively. The test parameters were: photomultiplier tube voltage 680V, ​​slit 2.5nm / 2.5m, scanning rate 60nm / min, excitation light wavelength 280nm, monitoring excitation light wavelength 650nm, and fluorescence emission intensity of 650nm red light.

[0049] For weather resistance, the diffraction curtain was aged according to "7.8 Weathering Resistance Test" in "Polyethylene Blown Greenhouse Film for Agriculture" (GB / T4455-2019). The diffraction curtain was exposed in a xenon lamp aging box for 2200 hours to test the performance retention rate.

[0050] A group of ordinary PET greenhouse films with a thickness of 0.05 mm was selected as a control group and the same test was conducted. The test results are shown in Table 1.

[0051] Table 1 PET light-reflecting curtain material performance test results

[0052] Based on the data in Table 1, it can be seen that: 1. The tensile strength of the screen of the present invention is 58.6~60.2MPa, which is more than 30% higher than that of ordinary PET film, and the elongation at break is increased by more than 25%. 2. The O2 and CO2 transmittance coefficients of the PET light-converting screen strip provided by the present invention are 25~28cm respectively. 3 mm / (m 2 ·d·MPa)、78~84cm 3 mm / (m 2 ·d·MPa), which is over 55% lower than that of ordinary PET film, effectively slowing down the oxidation of the light-converting agent and extending the service life of the light-converting screen. 3. The red light emission intensity reaches 8277-8395 au, and the tensile strength retention rate after 2200h weathering test is greater than 89%.

[0053] (2) Agricultural applications Four groups of 3m×5m greenhouses were built in the same field. The roofs were respectively capped with ordinary PET film and the PET light-converting curtains provided by Examples 1 to 3 of the present invention. Ten pepper plants (variety "Lafeng Heishuai") were planted in each group of greenhouses. The yield and growth cycle of the pepper crop were compared.

[0054] Table 2 Statistics of agricultural application effects

[0055] Based on the data in Table 2, it can be seen that in terms of agricultural applications, compared with greenhouses using ordinary PET greenhouse films, the pepper yield in greenhouses using PET light-converting curtains increased by 34% to 39%, and the growth cycle was shortened by 13 to 14 days, indicating that the light-converting curtains provided by the present invention can significantly improve the photosynthesis efficiency of crops.

[0056] Obviously, there are many specific implementation methods that can be changed under the concept of the present invention. Here, it should be stated that any changes made under the inventive concept of the present invention will fall within the scope of protection of the present invention.

Claims

1. A PET light-converting curtain with a single-layer mesh woven structure, characterized by: The raw materials of the PET light-converting curtain include base PET resin, bis(dioctylpyrophosphate)ethylene titanate, 2-seleno-3-methylbenzothiazole, polycarbonate, light-converting functional masterbatch, plasticizer, and lubricant; The raw materials for preparing the light-converting functional masterbatch include: nano-1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, polyethylene terephthalate-1,4-cyclohexanedimethanol, and europium trichloride; The raw materials for preparing the nano-1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide include 1,7-dibromo-3,4,9,10-perylenetetracarboxylic dianhydride, perfluorotrihexylamine, and 4-biphenylboric acid; The matrix PET resin is any one of polyethylene terephthalate, polyethylene naphthalate, and polyethylene furandicarboxylate; The plasticizer is any one of epoxy linseed oil, dioctyl adipate, and dioctyl phthalate; The lubricant is any one of ethylene bisoleamide, stearic acid triglyceride and stearic acid diglyceride.

2. The PET light-converting curtain according to claim 1, characterized in that: The nano-1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide is prepared from raw materials including, by weight, 10-15 parts of 1,7-dibromo-3,4,9,10-perylenetetracarboxylic dianhydride, 25-32 parts of perfluorotrihexylamine, and 19-24 parts of 4-biphenylboric acid.

3. The PET light-converting curtain according to claim 1, characterized in that: The light-conversion functional masterbatch is prepared from the following raw materials in parts by weight: 3-7 parts of nano-1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, 10-18 parts of PETG, and 1-4 parts of EuCl3.

4. The PET light-converting curtain according to claim 1, characterized in that: The mass ratio of the base PET resin, bis(dioctyl pyrophosphate)ethylene titanate, 2-seleno-3-methylbenzothiazole, polycarbonate, light conversion functional masterbatch, plasticizer, and lubricant is (90-115): (3-6): (2-5): (9-16): (12-20): (4-7): (3-7).

5. A method for preparing the PET light conversion curtain according to any one of claims 1 to 4, characterized in that: The method comprises the steps of preparing a light-converting masterbatch, preparing a PET light-converting curtain strip, and weaving the curtain. The method comprises the steps of preparing the PET light-converting curtain strip, wherein the base PET resin, bis(dioctylpyrophosphate)ethylene titanate, 2-seleno-3-methylbenzothiazole, polycarbonate, the light-converting masterbatch, a plasticizer, and a lubricant are uniformly mixed and added into a twin-screw extruder to extrude the light-converting curtain strip. The die head temperature of the twin-screw extruder is 260-275° C., and the extrusion pressure is 19-22 MPa.

6. The method for preparing the PET light conversion screen according to claim 5, characterized in that: The preparation method of the light conversion functional masterbatch comprises the following steps: S1. Dissolving 1,7-dibromo-3,4,9,10-perylenetetracarboxylic dianhydride and perfluorotrihexylamine in DMF, adding imidazole and performing reflux reaction to obtain N,N'-bis(perfluorotrihexylamino)-1,7-dibromoperylene diimide; S2, adding N,N'-bis(perfluorotrihexylamino)-1,7-dibromoperylene diimide, 4-biphenylboronic acid and FeCl3 / IMes.HCl catalyst to a toluene / ethanol mixed solvent, stirring and reacting for 12-16 hours to obtain a solid product 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide; S3, dissolving 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide in supercritical CO2, and suddenly reducing the pressure to normal pressure through a limiting nozzle to obtain nano-sized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide; S4. Melt and knead the nano-sized 1,7-bis(4-biphenyl)-N,N'-bis(perfluorotrihexylamino)perylene diimide, PETG and EuCl3 to obtain a melt, and granulate and dry the melt to obtain a light-converting functional masterbatch.

7. The method for preparing the PET light conversion screen according to claim 6, characterized in that: The reflux reaction has a reaction time of 8 to 12 hours and a reaction temperature of 140 to 150° C. The amount of imidazole used is 0.2 to 0.5% of the mass of perfluorotrihexylamine.

8. The method for preparing the PET light conversion screen according to claim 6, characterized in that: The stirring reaction has a reaction temperature of 90-95° C.; the toluene / ethanol mixed solvent has a mass ratio of toluene to ethanol of (4-6):

1.

9. The method for preparing the PET light conversion screen according to claim 6, characterized in that: The melting and banburying process has a banburying time of 20 to 30 minutes and a banburying temperature of 255 to 265°C.

10. The method for preparing the PET light conversion screen according to claim 6, characterized in that: The FeCl3 / IMes.HCl catalyst is used in an amount of 0.4-0.9% of the mass of 4-biphenylboric acid; the FeCl3 / IMes.HCl catalyst raw materials include FeCl3 and 1,3-bis(2,4,6-trimethylphenyl)imidazole chloride, and the mass ratio of FeCl3 to 1,3-bis(2,4,6-trimethylphenyl)imidazole chloride is 1:(2.1-3.8).

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