WO2021097977A1 - Light conversion film, and preparation method for multi-layer light conversion film - Google Patents

Abstract

The present invention relates to a thin film and a preparation method therefor, and in particular to a light conversion film, comprising a thin film body, a thin film inner layer, and at least one light conversion film layer provided between the thin film body and the thin film inner layer, wherein the thin film body is attached to the adjacent light conversion film layer; the thin film inner layer is attached to the adjacent light conversion film layer; the thin film inner layer comprises a formed thin film and a coating layer; the coating layer comprises an aqueous dripping antifogging coating liquid; and the light conversion film layer comprises, by weight percentage, 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. According to the method provided in the present invention, with the addition of the light conversion agent, green light in ultraviolet light in sunlight can be converted into red light, so as to promote the absorption of nutrient elements such as nitrogen, phosphorus, potassium and zinc by plants, increase the content of products of photosynthesis in leaves, promote crop growth, and also achieve the effect of reducing diseases and insect pests.

Description

Method for preparing light-transmitting film and multilayer light-transmitting film Technical field

The invention relates to a thin film and a preparation method thereof, in particular to a method for preparing a light-converting film and a multilayer light-conversion film.

Background technique

Light film is a kind of film that realizes light conversion by adding light conversion agent. It can convert ultraviolet light harmful to plant growth into blue-violet light and red-orange light useful for crops, or green light and yellow-green light that plants do not absorb. Converted into red light. That is, by changing the light quality that passes through the light conversion film, it promotes the absorption of nitrogen, phosphorus, potassium, zinc and other nutrients by plants, increases the content of photosynthesis products in the leaves, promotes crop growth, and reduces pests and diseases. .

At present, the light conversion films used in the market are all single-layer films, that is, a single-layer film formed by adding a light conversion agent to the original material group. This kind of film has certain mechanical properties and light conversion effects. defect.

Summary of the invention

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

The present invention is realized as follows:

A light-transmitting film, comprising a film body and a light-transmitting film layer. The light-transmitting film layer comprises 15%-18% of a light-transmitting agent, 60%-65% of an organic carrier, and a light stabilizer of 10%～10% by weight. 13% and antioxidant 12% to 16%; the film body includes 60% to 75% of the film base, 12% to 20% of light stabilizer, and 10% to 20% of antioxidant.

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

The present invention also provides a multi-layer light conversion film, the following is the technical solution:

A multi-layer light-converting film, comprising the above-mentioned film body and at least one light-converting film layer, the film body is bonded to one side of the light-converting film layer; and also includes a film inner layer bonded to the other side of the light-converting film layer. The inner layer includes a shaped film and a coating layer, and the shaped film contains an organic carrier, a light stabilizer of 12%-20% and an antioxidant 10%-20% by weight.

Further, the coating layer includes an aqueous dripping anti-fogging coating liquid.

Further, the chemical composition of the light conversion agent is Na _2+2y M _1-x－y Zr ₂ O _{6: x} Eu ²⁺ , where the value range of x is 0.01≤x≤0.2, and the value range of y is- 0.5≤y≤0.5.

Further, light stabilizers include phenyl salicylate, p-tert-butyl phenyl salicylate, resorcinol but benzoate, 2,4-dihydroxybenzophenone, 2-hydroxy-4- Methoxybenzophenone, bisphenol A bis-salicylate, 2-hydroxy-4-methoxy-benzophenone-5-sulfonic acid, (2,2,6,6-tetramethyl- 4-piperidine)imine, succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol polymer, sebacic acid bis-2,2,6,6- One or more of tetramethylpiperidinol esters.

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

The present invention also provides a preparation method for preparing a multi-layer light conversion film. The following is a technical solution:

A method for preparing a multi-layer light conversion film. The metered film body, the light conversion film layer and the forming film are mixed, and the mixed materials are fed into a multi-layer co-extruder to be melted and extruded, and then an aqueous stream is used. The anti-fogging coating liquid is used to coat and shape the inner layer.

Further, the extruded film is subjected to an inflation operation to form a cylindrical film or bubble, the cylindrical film or bubble is cooled, the air is discharged, and the surface of the film is corona treated.

Further, the melting temperature is 180-190°C, the film expansion ratio is 1:3-5, and the film draw ratio is 1:7-15.

The beneficial effects of the above scheme:

The method provided by the present invention can convert the green light in sunlight into red light by adding a light conversion agent, promote the absorption of nutrients such as nitrogen, phosphorus, potassium, and zinc by plants, and increase the content of photosynthetic products in leaves. , Promote the growth of crops, and at the same time play a role in reducing pests and diseases. In addition, the light conversion film provided by the present invention has a multilayer structure and can also have better tear resistance and puncture resistance on the basis of light conversion operations, and has good mechanical properties, low melting point, and good low-temperature heat-seal performance. High heat-sealing strength, good optical performance, film anti-adhesion and acupuncture properties. Thereby reducing high crystallinity, improving flexibility, impact resistance, filler compatibility and heat sealing performance, good transparency and surface gloss, good chemical stability, good anti-aging and ozone resistance strength, and non-toxic.

The water-based droplet anti-fogging coating solution is applied to form a highly transparent hydrophilic coating, so that the film has an excellent droplet anti-fogging function. Because the coating and the surface of the polyethylene film have a strong bonding force and excellent anti-aging performance, the dripping anti-fogging function of the coated agricultural film is synchronized with the service life of the agricultural film itself. The conventional operation of the coating film sold in the market is After the shed is locked, the coating layer will form a transparent water film such as a mirror effect within 12 hours, and there will be no dripping in the shed for long-term use.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative work.

Figure 1 is a schematic diagram of the structure of the present invention;

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

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work 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. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation or a specific orientation. The structure and operation cannot therefore be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

A light-transmitting film, comprising a film body and a light-transmitting film layer. The light-transmitting film layer comprises 15%-18% of a light-transmitting agent, 60%-65% of an organic carrier, and a light stabilizer of 10%～10% by weight. 13% and antioxidant 12% to 16%; the film body includes 60% to 75% of the film base, 12% to 20% of light stabilizer, and 10% to 20% of antioxidant.

Preferably, the light-converting film layer is at least one layer to form a multi-layer light-converting film. As shown in FIG. 1, the multi-layer light-converting film includes the above-mentioned film body 100 and at least one light-converting film layer (200, 300, 400), and the film body 100 is attached to one side of the light transfer film layer 200; it also includes a film inner layer 500 attached to one side of the light transfer film layer 400. The film inner layer 500 includes a formed film and a coating layer. The formed film is organic by weight percentage. Carrier, light stabilizer 12%-20% and antioxidant 10%-20%.

A method for preparing a multi-layer light conversion film. The metered film body, the light conversion film layer and the forming film are mixed, and the mixed materials are fed into a multi-layer co-extruder to be melted and extruded, and then an aqueous stream is used. The anti-fogging coating liquid is used to coat and shape the inner layer.

The preparation methods of the light conversion agent include:

(1) Take NaCO3, MgCO3, CaCO3, SrCO3, BaCO3, ZrO2 and Eu2O3 as raw materials, _{weigh each raw material according to the chemical formula Na 2+2y} M _1-xy Zr ₂ O _{6: x} Eu ²⁺ stoichiometric ratio, where x The value range of is 0.01≤x≤0.2, and the value range of y is -0.5≤y≤0.5; (2) The raw materials obtained in step (1) are fully ground in an agate mortar and then mixed uniformly; (3) The mixture obtained in step (2) is put into a corundum crucible, and then the corundum crucible and the mixture are put into a high-temperature tube furnace for burning. The burning temperature is 1000-1400°C, the burning time is 3-6 hours, and the burning time is 3-6 hours. After the firing is completed, the sample is cooled to room temperature with the furnace, and finally taken out to obtain a sintered body; (4) The sintered body obtained in step (3) is ball-milled and pulverized, and then washed and dried with distilled water to obtain a light conversion agent.

Example one

Referring to Figure 1, Figure 1 is a multi-layer light conversion film provided by the present invention. As shown in Figure 1, the film has a five-layer structure, including a film body, an outer layer 100, and a film inner layer 500. The film body 100 and the film Three light-transmitting film layers (200, 300, 400) are arranged between the inner layer 500.

In this embodiment, the film body 100 includes 75% of the film base, 12% of the light stabilizer and 13% of the antioxidant by weight percentage, wherein the film base is low-density polyethylene, and the light stabilizer is phenyl salicylate. The antioxidant is antioxidant 168.

In this embodiment, the components of the three light conversion film layers (200, 300, 400) are all the same, and are mainly composed of 60% by weight of organic carrier, 15% of light conversion agent, 10% of light stabilizer, and 12% of antioxidant; The organic carrier is low-density polyethylene, the chemical composition of the light conversion agent is Na ₂ Mg _0.98 Zr ₂ O _6:0.02 Eu ²⁺ , the light stabilizer is phenyl salicylate, and the antioxidant is antioxidant 168.

According to the above formula, after metering, they are mixed uniformly, respectively added to the hopper, enters the extruder, melted, extruded, and pelletized at 180°C to make functional masterbatch; melted and extruded at 180°C through a multi-layer co-extruder , And then enter the ring co-extrusion die to form a five-layer film extrusion, blow in compressed air from the cooling air pipe in the center of the die to inflate the film into a cylindrical film or bubble, and the inflation ratio of the film is 1:3. After internal and external air cooling, the height of the condensation line of the film is 200mm, and then enters the chevron to drain the air in the film bubble; the traction ratio of the film is 1:7; then the film surface is corona treated to wet the film The tension is increased to more than 38 dyne/square centimeter, and then the outer layer is coated with the coating solution, heated, dried and cured, and folded.

Example two

The film has a five-layer structure, including the film body, namely, the outer layer 100 and the film inner layer 500. Three light-transmitting film layers (200, 300, 400) are provided between the film body 100 and the film inner layer 500.

In this embodiment, the film body includes 65% by weight of the film base, 13% of light stabilizer and 16% of antioxidant, wherein the base of the film is linear polyethylene, and the light stabilizer is p-tert-butyl salicylate. The ester and antioxidant are antioxidant 330.

In this embodiment, the components of the three light conversion film layers (200, 300, 400) are all the same, and are mainly composed of 65% by weight of organic carrier, 18% of light conversion agent, 13% of light stabilizer, and 16% of antioxidant; The organic carrier is linear polyethylene, the light conversion agent is Na ₃ Mg _0.499 Zr ₂ O ₆ : _0.001 Eu ²⁺ , the light stabilizer is 2,4-dihydroxybenzophenone, and the antioxidant is antioxidant 330.

According to the above formula, after metering, they are mixed uniformly, respectively added to the hopper, enters the extruder, melted, extruded, and pelletized at 185℃ to make functional masterbatch; melted and extruded at 185℃ through the multi-layer co-extruder , And then enter the ring co-extrusion die to form a five-layer film extrusion, blow in compressed air from the cooling air pipe in the center of the die to inflate the film into a cylindrical film or bubble, and the film expansion ratio is 1:5. After internal and external air cooling, the height of the condensation line of the film is 250mm, and then it enters the chevron to drain the air in the film bubble; the traction ratio of the film is 1:9; then the film surface is corona treated to wet the film The tension is increased to more than 38 dyne/square centimeter, and then the outer layer is coated with the coating liquid, heated, dried and cured, and folded.

Example three

The film has a five-layer structure, including the film body, namely, the outer layer 100 and the film inner layer 500. Three light-transmitting film layers (200, 300, 400) are provided between the film body 100 and the film inner layer 500.

In this embodiment, the film body 100 includes 62% by weight of the film base, 11% of the light stabilizer and 14% of the antioxidant. The base of the film is high-density polyethylene, and the light stabilizer is resorcinol but benzene. Formate, antioxidant is antioxidant 3114.

In this embodiment, the components of the three light conversion film layers (200, 300, 400) are all the same, and are mainly composed of 62% by weight of organic carrier, 16% of light conversion agent, 11% of light stabilizer, and 14% of antioxidant; The organic carrier is high-density polyethylene, the light conversion agent is Na ₂ Ca _0.96 Zr ₂ O _6:0.04 Eu ²⁺ , the light stabilizer is resorcinol but benzoate, and the antioxidant is antioxidant 3114.

According to the above formula, after metering, they are mixed uniformly, respectively added to the hopper, enters the extruder, melted, extruded, and pelletized at 190℃ to make functional masterbatch; melted and extruded at 190℃ through the multi-layer co-extruder , And then enter the ring co-extrusion die to form a five-layer film extrusion, blow in compressed air from the cooling air pipe in the center of the die to inflate the film into a cylindrical film or bubble, and the film expansion ratio is 1:5. After internal and external air cooling, the height of the condensation line of the film is 250mm, and then enters the chevron to drain the air in the film bubble; the traction ratio of the film is 1:15; then the film surface corona treatment is performed to wet the film The tension is increased to more than 38 dyne/square centimeter, and then the outer layer is coated with the coating liquid, heated, dried and cured, and folded.

Comparison

The cucumber grown without film, the cucumber using the trial film, the cucumber using the multilayer light conversion film of Example 1, the cucumber using the multilayer light conversion film of Example 2, and the cucumber using the multilayer light conversion film of Example 3. , Carry out the cucumber growth index test. Randomly select 20 lettuce plants with similar sample parameters and repeat 3 times. 65 days after seedling cultivation, the test data is shown in Table 1 below.

Table 1:

The above descriptions are only preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A light-reflecting film, which is characterized by comprising a film body, a film inner layer, and at least one light-reflecting film layer arranged between the film body and the film inner layer;

   The film body is bonded to the adjacent light-converting film layer, and the inner layer of the film is bonded to the adjacent light-converting film layer;

   The inner layer of the film includes a molded film and a coating layer, and the coating layer includes an aqueous dripping anti-fogging coating liquid;

   The light conversion film layer includes 15%-18% of the light conversion agent, 60%-65% of the organic carrier, 10%-13% of the light stabilizer and 12%-16% of the antioxidant by weight percentage; the film body Including 60% to 75% of film matrix, 12% to 20% of light stabilizer and 10% to 20% of antioxidant; the chemical composition of the light conversion agent is Na _2+2y M _1-x-y Zr ₂ O _{6: x} Eu ²⁺ , where the value range of x is 0.01≤x≤0.2, and the value range of y is -0.5≤y≤0.5.
2. The light conversion film according to claim 1, wherein the organic carrier comprises one or more of low-density polyethylene, linear polyethylene, high-density polyethylene, polypropylene, and ethylene-vinyl acetate copolymer The film matrix includes one or more of low-density polyethylene, linear polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyvinyl chloride and metallocene polyethylene mixture.
3. The multilayer light conversion film according to claim 2, wherein the light stabilizer comprises phenyl salicylate, p-tert-butyl phenyl salicylate, resorcinol but benzoate, 2 , 4-Dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, bisphenol A salicylate, 2-hydroxy-4-methoxy-benzophenone-5- Sulfonic acid, (2,2,6,6-tetramethyl-4-piperidine)imine, succinic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinol One or more of polymers, bis-2,2,6,6-tetramethylpiperidinol sebacate.
4. The multilayer light conversion film according to claim 2, wherein the antioxidant includes antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 2246, antioxidant 300, antioxidant 330. One or more of antioxidant 3114, antioxidant 245, 2,6-di-tert-butyl-p-cresol, 2,4,6-tri-tert-butylphenol.
5. A method for preparing a multilayer light conversion film, characterized in that the metered film body, the light conversion film layer and the formed film of claim 1 are mixed, and the mixed materials are fed into the multilayer co-extruder to melt After extrusion molding, the inner layer is coated and molded with an aqueous droplet anti-fogging coating liquid.
6. The method for preparing a multilayer light-converting film according to claim 5, wherein the extruded film is inflated to form a cylindrical film or bubble, and the cylindrical film or bubble is cooled After that, the air is drained, and the surface of the film is corona treated.
7. The method for preparing a multilayer light-converting film according to claim 6, wherein the melting temperature is 180-190°C, the film expansion ratio is 1:3-5, and the film traction ratio is 1: 7～15.

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