CN110978697A

CN110978697A - Light conversion film, multilayer light conversion film and preparation method of multilayer light conversion film

Info

Publication number: CN110978697A
Application number: CN201911146019.6A
Authority: CN
Inventors: 徐蕾
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-04-10
Also published as: WO2021097977A1

Abstract

The invention relates to a film and a preparation method thereof, in particular to a light conversion film, a multilayer light conversion film and a preparation method of the multilayer light conversion film; the light conversion film layer comprises 15-18% of light conversion agent, 60-65% of organic carrier, 10-13% of light stabilizer and 12-16% of antioxidant by weight percentage; the film body comprises 60-75% of film matrix, 12-20% of light stabilizer and 10-20% of antioxidant; according to the method provided by the invention, the green light in the ultraviolet light in the sunlight can be converted into the red light by adding the light conversion agent, so that the absorption of nitrogen, phosphorus, potassium, zinc and other nutrient elements by plants is promoted, the content of photosynthesis products in the leaves is increased, the growth of crops is promoted, and meanwhile, the effect of reducing plant diseases and insect pests is achieved.

Description

Light conversion film, multilayer light conversion film and preparation method of multilayer light conversion film

Technical Field

The invention relates to a film and a preparation method thereof, in particular to a light conversion film, a multilayer light conversion film and a preparation method of the multilayer light conversion film.

Background

The optical film is a film that converts light by adding a light conversion agent, and converts ultraviolet light harmful to plant growth into blue-violet light and red-orange light useful for crops, or converts green light and yellow-green light, which are not absorbed by plants, into red light. The light quality of the light conversion film is changed, so that the absorption of nitrogen, phosphorus, potassium, zinc and other nutrient elements by plants is promoted, the content of photosynthesis products in leaves is increased, the growth of crops is promoted, and meanwhile, the effect of reducing plant diseases and insect pests is achieved.

The light conversion films applied in the market at present are single-layer films, namely, the single-layer films are formed by adding a light conversion agent on the original material set, and the films have certain defects in mechanical property and light conversion effect.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a light conversion film;

the invention is realized by the following steps:

2. a light conversion film comprises a film body and a light conversion film layer, wherein the light conversion film layer comprises 15-18% of light conversion agent, 60-65% of organic carrier, 10-13% of light stabilizer and 12-16% of antioxidant by weight percentage; the film body comprises 60-75% of film matrix, 12-20% of light stabilizer and 10-20% of antioxidant.

Further, the organic carrier comprises one or more of low-density polyethylene, linear polyethylene, high-density polyethylene, polypropylene and ethylene-vinyl acetate copolymer, and the film matrix comprises one or more of low-density polyethylene, linear polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer and polyvinyl chloride and metallocene polyethylene.

The invention also provides a multilayer light conversion film, which adopts the following technical scheme:

a multilayer light conversion film comprises the film body and at least one light conversion film layer, wherein the film body is attached to one surface of the light conversion film layer; the light conversion film layer is characterized by also comprising a film inner layer attached to the other surface of the light conversion film layer, wherein the film inner layer comprises a formed film and a coating layer, and the formed film comprises 12-20% of an organic carrier, 12-20% of a light stabilizer and 10-20% of an antioxidant in percentage by weight.

Further, the coating layer comprises an aqueous stream-drip defogging coating liquid.

Further, the chemical composition of the light conversion agent is Na_2+2yM_1-x－yZr₂O_6：xEu²⁺Wherein x is more than or equal to 0.01 and less than or equal to 0.2, and y is more than or equal to-0.5 and less than or equal to 0.5.

Further, the light stabilizer comprises one or more of phenyl salicylate, p-tert-butyl benzoate salicylate, resorcinol benzoate, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, bisphenol A disalicylate, 2-hydroxy-4-methoxy-benzophenone-5-sulfonic acid, (2,2,6, 6-tetramethyl-4-piperidine) imine, a polymer of succinic acid and 4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidinol, and bis-2, 2,6, 6-tetramethylpiperidinol sebacate.

Further, the antioxidant comprises one or more of antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 2246, antioxidant 300, antioxidant 330, antioxidant 3114, antioxidant 245, 2, 6-di-tert-butyl-p-cresol and 2,4, 6-tri-tert-butylphenol.

The invention also provides a preparation method for preparing the multilayer light conversion film, which adopts the following technical scheme:

a preparation method of a multilayer light conversion film comprises the steps of mixing the film body, the light conversion film layer and the formed film after metering, feeding the mixed materials into a multilayer co-extruder for melt extrusion forming, and then coating and forming an inner layer by using an aqueous dripping fog-dissipation coating liquid.

Further, the extruded film is subjected to inflation operation to form a cylindrical film or a film bubble, the cylindrical film or the film bubble is cooled, then air is exhausted, and the surface of the film is subjected to corona treatment.

Further, the melting temperature is 180-190 ℃, and the film blowing ratio is 1: 3-5, wherein the film draw ratio is 1: 7-15.

The beneficial effect of above-mentioned scheme:

according to the method provided by the invention, the green light in sunlight can be converted into red light by adding the light conversion agent, so that the absorption of nitrogen, phosphorus, potassium, zinc and other nutrient elements by plants is promoted, the content of photosynthesis products in leaves is increased, the growth of crops is promoted, and meanwhile, the effect of reducing plant diseases and insect pests is achieved. In addition, the light conversion film provided by the invention is of a multilayer structure, has better tear strength and puncture strength on the basis of light conversion operation, and has the characteristics of good mechanical property, low melting point, good low-temperature heat sealing property, high heat sealing strength, good optical property, good viscosity resistance and good needling property of a film and the like. Thereby reducing high crystallinity, improving flexibility, impact resistance, filler intermiscibility and heat sealing performance, having good transparency and surface gloss, good chemical stability, good aging resistance and ozone resistance, and no toxicity.

The water-based flow drop fog dissipation coating liquid for coating forms a layer of highly transparent hydrophilic coating, so that the film has an excellent flow drop fog dissipation function. Because the coating and the surface of the polyethylene film have stronger binding force and excellent ageing resistance, the dripping fog dissipation function of the coated agricultural film is synchronous with the service life of the agricultural film, after the greenhouse is buckled according to the conventional operation of the coating film sold in the market, the coating forms a transparent water film such as a mirror surface effect in 12 hours, and no dripping is hung in the greenhouse after long-term use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of the present invention;

100. an outer layer; 200. a secondary outer layer; 300. a middle layer; 400. a secondary inner layer; 500. an inner layer.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

A light conversion film comprises a film body and a light conversion film layer, wherein the light conversion film layer comprises 15-18% of light conversion agent, 60-65% of organic carrier, 10-13% of light stabilizer and 12-16% of antioxidant by weight percentage; the film body comprises 60-75% of film matrix, 12-20% of light stabilizer and 10-20% of antioxidant.

The preparation method of the light conversion agent comprises the following steps:

(1) NaCO3, MgCO3, CaCO3, SrCO3, BaCO3, ZrO2 and Eu2O3 are used as raw materials, and the raw materials are represented by the chemical formula Na₂₊ _2yM_1-x-yZr₂O_6：xEu²⁺Weighing the raw materials according to the stoichiometric ratio, wherein the value range of x is more than or equal to 0.01 and less than or equal to 0.2, and the value range of y is more than or equal to-0.5 and less than or equal to 0.5; (2) fully grinding the raw materials obtained in the step (1) in an agate mortar and then uniformly mixing; (3) putting the mixture obtained in the step (2) into a corundum crucible, then putting the corundum crucible and the mixture into a high-temperature tube furnace together for burning, wherein the burning temperature is 1000-1400 ℃, the burning time is 3-6 hours, cooling the sample to room temperature along with the furnace after burning is finished, and finally taking out the sample to obtain a sintered body; (4) and (4) performing ball milling and crushing on the sintered body obtained in the step (3), and then washing and drying with distilled water to obtain the light conversion agent.

Example one

Referring to fig. 1, fig. 1 is a schematic view of a multilayer light conversion film according to the present invention, as shown in fig. 1,

the film is of a five-layer structure and comprises a film body, namely an outer layer and a film inner layer, wherein three light conversion film layers are arranged between the film body and the film inner layer.

In this example, the film body includes 75% by weight of a film substrate, 12% by weight of a light stabilizer and 13% by weight of an antioxidant, wherein the film substrate is low density polyethylene, the light stabilizer is phenyl salicylate, and the antioxidant is antioxidant 168.

In this embodiment, the three light conversion film layers have the same composition, and mainly comprise, by weight, 60% of an organic vehicle, 15% of a light conversion agent, 10% of a light stabilizer, and 12% of an antioxidant; wherein the organic carrier is low density polyethylene, and the chemical composition of the light conversion agent is Na₂Mg_0.98Zr₂O_6：0.02Eu²⁺The light stabilizer is phenyl salicylate, and the antioxidant is antioxidant 168.

According to the formula, the raw materials are metered and then respectively and uniformly mixed, and the mixture is respectively added into a hopper and enters an extruder to be melted, extruded and granulated at 180 ℃ to prepare functional master batches; the film is melted and extruded at 180 ℃ by a multilayer co-extruder, then enters an annular co-extrusion die head to form five-layer film extrusion, compressed air is blown in from a cooling air pipe at the center of the die head to blow the film into a cylindrical film or a film bubble, and the blow-up ratio of the film is 1: 3. cooling by internal and external air, wherein the condensation line height of the film is 200mm, and then, introducing the film into a herringbone clamping plate to exhaust air in the film bubble of the greenhouse; draw ratio of film 1: 7; then the surface of the film is treated by corona to increase the wetting tension of the film to more than 38 dyne/square centimeter, and then the coating solution is used for outer layer coating, heating, drying, curing and folding.

Example two

In this example, the film body comprises 65% by weight of a film matrix, 13% by weight of a light stabilizer and 16% by weight of an antioxidant, wherein the film matrix is linear polyethylene, the light stabilizer is p-tert-butyl benzoate salicylate, and the antioxidant is antioxidant 330.

In this embodiment, the three light conversion film layers have the same composition, and mainly comprise 65% by weight of organic carrier, 18% by weight of light conversion agent, 13% by weight of light stabilizer, and 16% by weight of antioxidant; wherein the organic carrier is linear polyethylene, and the light conversion agent is Na₃Mg_0.499Zr₂O₆：_0.001Eu²⁺The light stabilizer is 2, 4-dihydroxy benzophenone, and the antioxidant is antioxidant 330.

According to the formula, the raw materials are metered and then respectively and uniformly mixed, and the mixture is respectively added into a hopper and enters an extruder to be melted, extruded and granulated at 185 ℃ to prepare functional master batches; the film is melted and extruded at 185 ℃ by a multilayer co-extruder, then enters an annular co-extrusion die head to form five-layer film extrusion, compressed air is blown in from a cooling air pipe at the center of the die head to blow the film into a cylindrical film or a film bubble, and the blow-up ratio of the film is 1: 5. cooling by internal and external air, wherein the condensation line height of the film is 250mm, and then, introducing the film into a herringbone clamping plate to exhaust air in the film bubble of the greenhouse; draw ratio of film 1: 9; then the surface of the film is treated by corona to increase the wetting tension of the film to more than 38 dyne/square centimeter, and then the coating solution is used for outer layer coating, heating, drying, curing and folding.

EXAMPLE III

In this example, the film body includes, in weight percent, 62% of a film substrate, 11% of a light stabilizer and 14% of an antioxidant, wherein the film substrate is high density polyethylene, the light stabilizer is resorcinol but benzoate, and the antioxidant is antioxidant 3114.

In this embodiment, the three light conversion film layers have the same composition and mainly comprise, by weight, 62% of an organic vehicle, 16% of a light conversion agent, 11% of a light stabilizer, and 14% of an antioxidant; wherein the organic carrier is high density polyethylene, and the light conversion agent is Na₂Ca_0.96Zr₂O_6：0.04Eu²⁺The light stabilizer is resorcinol but benzoate, and the antioxidant is antioxidant 3114.

According to the formula, the raw materials are metered and then respectively and uniformly mixed, and the mixture is respectively added into a hopper and enters an extruder to be melted, extruded and granulated at 190 ℃ to prepare functional master batches; the film is melted and extruded at 190 ℃ by a multilayer co-extruder, then enters an annular co-extrusion die head to form five-layer film extrusion, compressed air is blown in from a cooling air pipe at the center of the die head to blow the film into a cylindrical film or a film bubble, and the blow-up ratio of the film is 1: 5. cooling by internal and external air, wherein the condensation line height of the film is 250mm, and then, introducing the film into a herringbone clamping plate to exhaust air in the film bubble of the greenhouse; draw ratio of film 1: 15; then the surface of the film is treated by corona to increase the wetting tension of the film to more than 38 dyne/square centimeter, and then the coating solution is used for outer layer coating, heating, drying, curing and folding.

Comparative example

Cucumber growth index tests were performed on cucumbers planted without using a film, cucumbers using a pilot film, cucumbers using the multi-layer light conversion film of example 1, cucumbers using the multi-layer light conversion film of example 2 and cucumbers using the multi-layer light conversion film of example 3. Randomly selecting 20 lettuce with similar sample parameters, and repeating for 3 times. 65 days after the nursery, the test data are shown in Table 1 below.

Table 1:

the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A light conversion film is characterized by comprising a film body and a light conversion film layer, wherein the light conversion film layer comprises 15-18% of a light conversion agent, 60-65% of an organic carrier, 10-13% of a light stabilizer and 12-16% of an antioxidant in percentage by weight; the film body comprises 60-75% of film matrix, 12-20% of light stabilizer and 10-20% of antioxidant;

the film comprises a film body and at least one light conversion film layer, wherein the film body is attached to one surface of the light conversion film layer; the coating layer comprises water-based dripping and fog-dispersing coating liquid;

the chemical composition of the light conversion agent is Na_2+2yM_1-x－yZr₂O_6：xEu²⁺Wherein x is more than or equal to 0.01 and less than or equal to 0.2, and y is more than or equal to-0.5 and less than or equal to 0.5.

2. The light conversion film according to claim 1, wherein the organic vehicle comprises one or more of low density polyethylene, linear polyethylene, high density polyethylene, polypropylene, and ethylene-vinyl acetate copolymer, and the film matrix comprises a mixture of one or more of low density polyethylene, linear polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and polyvinyl chloride, and metallocene polyethylene.

3. The multilayer light-converting film according to claim 2, wherein the light stabilizer comprises one or more of phenyl salicylate, p-tert-butyl salicylate, resorcinol benzoate, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, bisphenol a disalicylate, 2-hydroxy-4-methoxy-benzophenone-5-sulfonic acid, (2,2,6, 6-tetramethyl-4-piperidine) imine, a polymer of succinic acid with 4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidinol, bis-2, 2,6, 6-tetramethylpiperidinol sebacate.

4. The multilayer light-converting film according to claim 2, wherein the antioxidant comprises one or more of antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 2246, antioxidant 300, antioxidant 330, antioxidant 3114, antioxidant 245, 2, 6-di-tert-butyl-p-cresol, and 2,4, 6-tri-tert-butylphenol.

5. A process for producing a multilayer light-converting film, characterized by mixing the film body, the light-converting film layer and the molded film according to claim 1 in a metered amount, subjecting the mixed materials to melt extrusion molding in a multilayer co-extruder, and then coating the inner layer with an aqueous dripping defogging coating liquid.

6. The method of claim 5, wherein the extruded film is blown to form a tubular film or bubble, the tubular film or bubble is cooled and then the air is purged, and the surface of the film is corona treated.

7. The method for producing a multilayer light conversion film according to claim 6, wherein the melt temperature is 180 to 190 ℃, and the film inflation ratio is 1: 3-5, wherein the film draw ratio is 1: 7-15.