KR101462545B1 - Light-blocking agent composition for industrial use - Google Patents

Abstract

The present invention relates to an industrial light blocking composition with excellent applicability and water resistance. Particularly, the present invention transmits a lot of photosynthesis activating light required for the growth of plants and selectively blocks ultraviolet light and infrared light, thereby being able to produce plants with excellent productivity and quality when the composition is industrially applied to an agricultural facility and the like.

Description

TECHNICAL FIELD [0001] The present invention relates to a light shielding composition for industrial use,

The present invention relates to an industrial light-shielding composition, and more particularly to an industrial light-shielding composition which reduces the transmittance of ultraviolet light and infrared light while maintaining the transmittance of visible light.

Many crops utilize agricultural facilities that can artificially control light, temperature, humidity, etc., thereby improving the convenience and yield of crop cultivation. However, in a sunny climate condition, particularly in an environment where abnormal high temperature phenomenon recently occurs, the crops are exposed to a large amount of light, thereby hindering the growth of the crops. In severe cases, the crops are burned or not aged sufficiently .

Therefore, when an agricultural facility is used, a variety of shading systems are applied to prevent damage to crops caused by excessive sunlight, but there are various problems. There is a problem that the house is deformed due to the load, which is inconvenient to put on and remove. In addition, in the case of the screen light shielding system, it is difficult to reduce the room temperature, the effect of reducing fruiting and leaf temperature is low and the cost is high, and it is troublesome to change the screen light shielding system depending on the crop. In addition, in the case of a conventional greenhouse light-shielding agent, there is a problem that light which is essential for biological growth is blocked because it has a characteristic of blocking all light.

Recently, many studies have been made on a technique for selectively shielding light. Korean Patent No. 0469604 discloses a technique for selectively shielding sunlight using a UV absorption effect. No. 0881680 discloses a technique for a thermal insulation material for an agricultural and horticultural facility having heat insulation by effectively shielding near-infrared light by transmitting visible light to maintain necessary brightness. In addition, Japanese Patent No. 4,136,598 discloses a technique for providing a synthetic resin emulsion which does not affect the environment by using a biodegradable resin emulsion as a spray-type light shielding agent, as a technique for facilitating application of a light shielding agent.

It is an object of the present invention to prepare a light-shielding composition capable of maximizing the light-shielding property, in particular, the light-transmitting efficiency of the photosynthetic active light.

It is still another object of the present invention to provide a light-shielding composition which is excellent in coating properties and water resistance.

In order to achieve the above object, the present invention provides an industrial light-shielding composition comprising a pigment, a pigment fixer, a dispersing agent, a thickening agent, a defoaming agent, a preservative and a residual amount of solvent, wherein the pigment is selected from the group consisting of mica, tin oxide, At least two kinds of industrial shading agents selected from the group consisting of calcium carbonate, zirconium dioxide, synthetic fluorofluorophosphite and titanium dioxide.

Also preferably, the composition comprises from 5 to 25% by weight of pigment based on the total weight of the composition, from 5 to 20% by weight of pigment fixture, from 1 to 4% by weight of dispersant, from 3 to 15% by weight of thickener, from 0.5 to 2.0% % Defoamer and 0.5-2.0 wt% preservative.

Also preferably, the pigment has a particle size of from 9 to 45 μm.

Also preferably, the pigment comprises mica, tin oxide and titanium dioxide.

It is also preferable to use a pigment comprising 30 to 60% by weight of mica, 30 to 60% by weight of titanium dioxide, 0.1 to 10% by weight of tin oxide, 1 to 15% by weight of zirconium dioxide and 0.1 to 10% And cobalt oxide.

Also preferably, the pigment fixture is at least one selected from the group consisting of an acrylic resin, an epoxy resin, a phenol resin, and a polyimide.

Also preferably, the dispersing agent is selected from the group consisting of sodium polyacrylate, a powder of a maleic anhydride styrene copolymer, an alkyl naphthalenesulfonate sodium-formalin condensate, sodium lignosulfonate, polyethylene glycol phenyl ether, polyethylene glycol, ether dialkyl sulfosuccinate and And sorbitan aliphatic ethylene oxide adducts.

Preferably, the thickening agent is selected from the group consisting of xanthan gum, allantoin, 2-methyl-2-propenoic acid, ethyl 2-propenoate, meta-clonic acid, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose and magnesium aluminum silicate At least one selected from the group consisting of

Preferably, the antifoaming agent is at least one selected from the group consisting of a nonionic surfactant and a silicone antifoaming agent.

Also preferably, the preservative is selected from the group consisting of bistributyltin oxide, dibutyltin dilaurate and tributyltin fumarate, copper naphthenate, copper pentachlorophenol, zinc-2-pyridinethiol oxide, tetrachloroisophthalonitrile Benzyl bromoacetate, pentachlorophenyl laurate, 2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine, di-chlorophenol, tri-chlorophenol, tetra-chlorophenol, penta-chlorophenol chloro-m-cresol and p-chloro-m-xylenone, o-phenylphenol, 2- (4-thiazoyl) benzimidazole, 5-chloro-2- -3-one and 1,2-benzointhiazolin-3-one, N- (trichloromethylthio) phthalimide, N- (dichlorofluoromethylthio) phthalimide, hexahydro- , 3,5-tris (2-hydroxyethyl-S-triazine), thio-2,2'-bis (benzomethyl amide) -tetrahydro -3,5-dimethylene-2H-1,3,5-thiazine-2-thione, sodium benzoate and glutaraldehyde.

Preferably, at least one solvent selected from the group consisting of purified water and alcohol is used.

An object of the present invention is to prepare an industrial light-shielding agent by mixing the above composition and purified water at a weight ratio of 1: 1 to 1: 9.

Also preferably, the industrial light-shielding agent is characterized by lowering the transmittance of ultraviolet rays and infrared rays.

Also preferably, the industrial shading agent is characterized by being applied to an agricultural facility.

According to the present invention, it is possible to prevent the damage due to temperature by reducing the temperature of the summer farming facility through efficient blocking of ultraviolet and infrared wavelengths, selectively transmit the photosynthetic active light, and scatter it to the entire interior of the greenhouse .

FIG. 1 shows a comparison between the case where the light shielding agent of the present invention and the entire optical light shielding network are provided.
Fig. 2 shows the coating properties and water resistance test results of the light-shielding composition of Examples 1 to 4 and Comparative Examples 1 to 4.
FIG. 3 shows experimental results for comparing the transmittance of photosynthetic active light. FIG. 3A shows the result using the spectroscope ILT 900, and FIG. 3B shows the result using the spectrometer NIR 256-2.5.
4 shows the light transmittance in the case of using a light shielding agent and the light transmittance in the untreated area.
5 shows changes in the optical wavelength of the light shielding agent by concentration.
FIG. 6 shows changes in lettuce growth on day 71 after seeding according to the concentration of light shielding agent. (A) shows the growth of the above-ground and underground part of lettuce photographed on the side, (B) (C) shows the growth of the underground part.

Unless defined otherwise, all technical terms used in the present invention have the following definitions and are consistent with the meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Also, preferred methods or samples are described in this specification, but similar or equivalent ones are also included in the scope of the present invention.

In the present invention, an industrial shading agent means a shading agent applied or adhered to a facility such as vinyl, glass or the like capable of transmitting light, for example, a window or glass door of a building to provide a shading effect. In the present invention, an agricultural facility means a facility for controlling a certain growth condition or blocking or mitigating the influence on the outside environment including a greenhouse for growing crops, a glasshouse, and a housing for livestock.

Solar light can be broadly divided into infrared rays, ultraviolet rays, and visible rays. Infrared refers to electromagnetic waves that are farther away from the end of the red line when the sun's light is dispersed into the prism. According to the length of the wavelength, near infrared rays with a wavelength of 0.78 to 3, infrared rays with a wavelength of 3 to 25, and far infrared rays having a wavelength of 25 or more are classified as infrared rays. Infrared rays are characterized by having a stronger heat effect than visible light or ultraviolet rays, and are therefore referred to as heat rays. Ultraviolet rays are rays that are shorter than visible rays and invisible to the naked eye. It is a collective term of electromagnetic wave with wavelength of about 10 ~ 380nm. It is called chemical ray because it has strong chemical action. Visible light means light having a wavelength range perceived by the eye, and physical light is a spectrum within a wavelength limit that is perceived as color in the eye, and is an electromagnetic wave having a wavelength in the range of approximately 380 to 780 nm.

Visible light beam is useful for photosynthesis required by plants. Particularly, light of 400 to 700 nm is called photosynthetically active radiation (PAR). On the other hand, light in the wavelength range of 100 to 400 nm adversely affects most plant species, such as reducing the leaf area of the plant, lowering the rate of photosynthesis, affecting the flowering time of the plant and the number of days of flowering. In addition, light above the 780nm wavelength region increases the temperature of fruits and leaves, and the temperature inside the greenhouse.

In order to solve the above-mentioned problems, the present invention has developed an industrial light-shielding composition having selective light-shielding properties. In this case, in the case of a summer such as a summer where a large amount of light is transmitted, it is sprayed on a window or a glass door of a building to shield the infrared rays emitting heat while maintaining transparency. Fig. 1 shows the comparison of the degree of light transmission when a light shielding agent and a total light shielding network are provided. When a selective light shielding agent is applied, visible light is smoothly transmitted and scattered. However, when an entire light shielding light shielding network is installed, visible light is not transmitted through the greenhouse and shadows appear.

The light-shielding composition of the present invention may include pigments, pigment fixatives, dispersants, thickeners, defoamers, preservatives and solvents. Further, a substance commonly used in the technical field may further be included. For example, an ammonia solution or the like may be used as a pH adjusting agent, and a smoothing agent or the like may further be used.

The pigment may include at least two selected from the group consisting of mica, tin oxide, cobalt oxide, calcium carbonate, zirconium dioxide, synthetic fluorofluorophosphite, and titanium dioxide. Preferably, the main material may include mica, tin oxide and titanium dioxide, more preferably 30 to 60% of mica, 30 to 60 wt% of titanium dioxide and 0.1 to 10 wt% of tin oxide . ≪ / RTI > In addition, it may preferably contain mica, tin oxide, titanium dioxide, zirconium dioxide and cobalt oxide as main raw materials, more preferably 30 to 60% by weight of mica, 30 to 60% by weight of titanium dioxide , 0.1 to 10 wt% tin oxide, 1 to 15 wt% zirconium dioxide, and 0.1 to 10 wt% cobalt oxide. At this time, a pigment having a particle size of 9 to 45 μm can be used. When the particle size is less than 9 탆 or when the particle size is more than 45 탆, there is a problem in application. The pigment functions as a main function of applying light to the adherend to selectively block light, and has various functions such as facilitating adsorption or removal depending on the type of the pigment fixture.

As the pigment fixture, an acrylic resin, an epoxy resin (EP), a phenol resin (PF) and a polyimide can be used. Preferably, an acrylic resin such as polymethyl methacrylate and acrylonitrile styrene resin can be used. More preferably, the acrylic resin is an acrylate copolymer modified product and can have a solid content of 50% by weight or less, a glass transition temperature (Tg) of -25 to -5, an acid value of 5 to 30%, and a pH of 7.0 to 8.0. Acrylic copolymer or the like is mixed with a pigment or the like, the water resistance of the complex can be increased, and the pigment can be fixed on the surface to have the maximum effect at a minimum amount and have various functions according to the size and shape of the particles.

The dispersing agent may be a copolymer having a pigment-affinity group. Examples of the dispersing agent include sodium polyacrylate, a glycidyl styrene (or olefin) maleic anhydride copolymer, sodium alkylnaphthalenesulfonate-formalin condensate, sodium lignosulfonate, polyethylene glycol Phenyl ether, polyethylene glycol high alkyl, ether dialkyl sulfosuccinate, and sorbitan aliphatic ethylene oxide adducts. At this time, a solid content of 10% by weight or more can be used. The dispersant has a function of dispersing the pigment evenly.

The thickener may be selected from the group consisting of xanthan gum having a solids content of at least 10% by weight, allantoin, 2-methyl-2-propenoic acid, ethyl 2-propenoate, meta-clonic acid, carboxymethylcellulose, methylcellulose, hydroxyethylcellulose And magnesium aluminum silicate may be used. Increasing agents play a role in increasing product stability and state stability.

The antifoaming agent may be a nonionic surfactant and a silicone antifoaming agent. The nonionic surfactants may be EO / PO block polymers, fatty alcohol-polyethylene oxide (EO 3 mol or less), diisobutylcarbinol, oleic acid, toole oil and polyoxypropylene-polyoxyethylene block copolymer. The antifoaming agent may be an emulsion type, a compound type or an oil type silicone antifoaming agent. Defoamer acts to remove air bubbles that can occur when manufacturing and applying products.

Preservatives include organic tin compounds (such as bistributyltin oxide, dibutyltin dilaurate and tributyltin fumarate), organic copper compounds (such as copper naphthenate and copper pentachlorophenol), organic zinc compounds (zinc-2-pyridine Thiol oxide, etc.), organic halogen compounds (tetrachloroisophthalonitrile benzyl bromoacetate, pentachlorophenyl laurate and 2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine) Phenol compounds such as di-chlorophenol, tri-chlorophenol, tetra-chlorophenol, penta-chlorophenol, p-chloro-m-cresol and p-chloro-m-xylenone and o- (5-chloro-2-methyl-4-isothiazolin-3-one and 1,2-benzointhiazole, etc.) Azolin-3-one, etc.), an n-halomethyl thioetherimide compound (N- (trichloro (Methylthio) phthalimide and N- (dichlorofluoromethylthio) phthalimide), triazine compounds (hexahydro-1,3,5-tris (2-hydroxyethyl-S- ), An organic nitrogen sulfur compound (thio-2,2'-bis (benzomethylamido) -tetrahydro-3,5-dimethylene-2H-1,3,5-thiazine- Benzoate, glutaraldehyde and the like can be used. The preservative has a role of improving long-term preservability.

The solvent may be purified water, alcohol, or the like. Alcohols include isopropyl alcohol, butyl diglycol, ethyl diglycol, methanol, butyl alcohol and ethanol. Solvents are used to dissolve the material.

However, the present invention is not limited thereto, and other materials performing the same function may be included.

The light-shielding agent can be preferably diluted in purified water. It is preferable to mix the light-shielding agent composition and the purified water at a weight ratio of 1: 1 to 1: 9. However, the present invention is not limited thereto, and the required amount of light differs depending on the crop, so that the mixing ratio can be adjusted and used.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and experimental examples.

< Experimental Example  1: Optimum raw material mixing ratio of light shielding agent>

Table 1 shows the mixing ratios of Examples 1 to 4 and Comparative Examples 1 to 4. In the method of preparing the light-shielding agent used in the experiment, about 50 to 70% of purified water was added, followed by adding a dispersant and a pigment, and stirring for about 40 minutes. Then, the pigment fixture was added, and the mixture was stirred for 1 hour, and the remaining ingredients were added and stirred. The viscosity was adjusted to about 5,000 ~ 6,000 cp and the pH was about 9 ± 5. The prepared shading agent was diluted to a certain ratio and sprayed on a glass specimen to evaluate the applicability. The applicability evaluation was determined according to the degree to which the coating was uniformly applied at a constant ratio. The water resistance was determined by the degree of surface change of the applied shading agent by spraying artificial rainfall (rainy season rainfall during the summer season).

Table 1. Ratio of raw materials according to each of Examples and Comparative Examples

2 and Table 2 show the results of the coating and water resistance tests according to the blending ratios of the raw materials of Examples 1 to 4 and Comparative Examples 1 to 4. In Comparative Example 1, there was a phenomenon that the application did not become uniform and the adhesive was concentrated to the center. In the water resistance test, most of the application surface was peeled off. In Comparative Example 2, there was a phenomenon that the dispersion was not good and the upper portion was thinned, and almost all of them were peeled off in the water resistance test. In Comparative Example 3, there was a phenomenon in which the upper portion became thin due to the dispersion failure, and the middle intermediate pigment portion was aggregated. In the water resistance test, most of them were peeled off. In Comparative Example 4, although the coatability was improved, the upper portion still did not exhibit uniform coating property, and some portions were bundled, and in the water resistance test, 50 to 60% were peeled off. In Example 4, uniform coating properties can be seen, but in the water resistance test, 50 to 60% were peeled off. In Example 3, the coating properties were slightly agglomerated but uniform coating properties were improved, and the water resistance parts were also improved to some extent. Example 2 showed uniform coating properties and improved water resistance. Example 1 showed uniform application and good water resistance.

Table 2. Coating property and water resistance test result according to each example and comparative example

< Experimental Example  2: Shading agent  Photosynthesis following application Active light  Transmittance>

Experiments were conducted to measure the light wavelength characteristics according to the application and dilution ratio in the light shielding agent. Using a square glass plate (65 cm x 65 cm x 0.5 cm), a non-treated (control) and a photo-selective shading agent were prepared by applying a diluted solution at a ratio of 10 wt% and 20 wt%. The edge of the square frame was completely shielded with a black cloth. In order to compare the difference according to the optical wavelength measuring equipment, it was specified using a spectroradiometer ILT900 (International Light Technologies Co., USA) and a spectrometer NIR256-2.5 (Ocean Optics Co. Ltd., USA). The results of using each device are shown in Figs. 3A and 3B. In the range of 300 ~ 400nm, the ultraviolet transmittance was the lowest in the treatment group in which the light shielding agent was applied at the ratio of 10% by weight, as compared with the control. In the photosynthetic active light area (400 to 700 nm), the results were similar to those of the control (untreated) at the treatment rate of 20% by weight. 4 is a graph showing a comparison between values of the case where the selective light shielding agent according to the present invention is used and the values in the entire wavelength range of the untreated control. In the range of 800 to 2,500 nm, the transmittance of the selective light shielding agent is lower than that of the control, thus exhibiting an effective selective shielding effect.

< Experimental Example  3: Growth of lettuce according to the concentration of selective shading agents>

In order to measure the light wavelength characteristics according to the application rate of the optically selective shading agent, experiments were carried out at an area of 12 m ² (3.6 pyeong) with 1.6 m of the arched mini- One of the four greenhouses was not treated for use as a control, and the remaining three greenhouses were coated with a photo-selective shading agent at a ratio of 10 wt%, 20 wt%, and 30 wt%.

FIG. 5 shows changes in the optical wavelength of the selective shading agent by concentration. As a result of measuring the light wavelength after coating treatment, when the control was compared in the range of 300 to 400 nm in the ultraviolet ray region, the ultraviolet ray transmittance was lowest in the treatment in which the light shielding agent was applied at a ratio of 30% by weight. Light transmittance in the photosynthetic active light area was similar to that of the control in the treatments applied at the ratio of 20 wt% and 30 wt%. The light transmittance at 800 ~ 2,500nm, which is the near infrared region mainly radiating heat ray, was lowest at 30 wt% treatment. Table 3 shows the results of investigating the change of lettuce growth on the 71st day after seeding according to the selective shading agent by concentration. Plant height, leaf width, fresh weight, and light weight of the building (top part) showed the best growth in treatment with 30% by weight of photo-selective shading agent. The underground part of the building was high in the control treatment without treatment. The content of chlorophyll was higher in the treatment of 10% by weight. The photosynthetic active light transmittance was high in photosynthetic treatment at 30 wt% application of photo-selective shading agents and the transmittance was lower than that of other shading agents in the near-infrared region, indicating typical characteristics of photo-selective shading agents. FIG. 6 shows changes in lettuce growth on day 71 after sowing according to the concentration-selective shading agent. (A) shows the growth of the above-ground and underground portions of the lettuce, and (B) (C) shows the growth of the ground part. As shown in FIG. 6, it was found that the growth of 'red skirt' lettuce was the best in the treatment of 30% by weight of photo-selective shading agent which can reduce crop stress due to high temperature by lowering the temperature inside the greenhouse and the plant temperature.

Table 3. Changes in lettuce growth on day 71 after sowing with selective shading agents by concentration

< Experimental Example  4: Application of crops (strawberries)>

Growth of crops was compared according to the type of shading agent. Table 4 below compares the results of strawberry cultivated from soil and water, respectively. In both soil and hydroponic cultivation, the application of selective shading agent was found to be superior to plant height, leaf number, leaf area, and discharge. As the selective light-shielding agent used in Experimental Example 4, a light-shielding agent having a composition ratio of Example 1 was used and diluted with a weight ratio of 1: 4 (light-shielding agent 1: purified water 4). 55%, the light-shielding film generally used for a vinyl house or the like was used.

Table 4. Growth of crops according to the type of shading agent (strawberry application test (Kyungnam Agricultural Research and Extension Services))

Table 5 shows the commercial part of the crop according to the type of shading agent. The product and number were significantly higher than the 55% shading film when the optional shading agent was used. Compared with 55% shading film and general shading agent, the use of selective shading agent showed better results in terms of number of products, number of products, number of products, number of products, and number of products.

Table 5. Comparison of commerciality according to kinds of shading agents (strawberry application test (Kyungnam Agricultural Research and Extension Services))

The use of selective shading agents is shown in Table 6 to comply with dilution ratios in order to be able to apply different dilution ratios to crops and climates.

Table 6. Light-blocking rate according to the dilution ratio (weight ratio) of the selective light-

Claims (14)

As industrial shading compositions,
Wherein the pigment is selected from the group consisting of 30 to 60% by weight of mica, 30 to 60% by weight of titanium dioxide, 0.1 to 10% by weight of a pigment, a pigment fixative, a dispersing agent, a thickening agent, an antifoaming agent, % Of tin oxide, 1 to 15 wt% of zirconium dioxide, and 0.1 to 10 wt% of cobalt oxide. The composition of claim 1, wherein the composition comprises from 5 to 25% by weight of pigment, from 5 to 20% by weight of pigment fixation, from 1 to 4% by weight of dispersant, from 3 to 15% 2.0% by weight defoamer and 0.5-2.0% by weight preservative. The industrial shading agent composition according to claim 1, wherein the pigment has a particle size of 9 to 45 μm. delete delete The industrial shading agent composition according to claim 1, wherein the pigment fixing agent is at least one selected from the group consisting of an acrylic resin, an epoxy resin, a phenol resin, and a polyimide. The method of claim 1, wherein the dispersant is selected from the group consisting of sodium polyacrylate, a powder of a maleic anhydride styrene copolymer, a sodium alkylnaphthalenesulfonate-formalin condensate, sodium lignosulfonate, polyethylene glycol phenyl ether, polyethylene glycol, And an aliphatic ethylene oxide adduct of a sorbitan aldehyde and an aliphatic ethylene oxide adduct. The method of claim 1, wherein the thickener is selected from the group consisting of xanthan gum, allantoin, 2-methyl-2-propenoic acid, ethyl 2-propenoate, meta-cinnamic acid, carboxymethylcellulose, methylcellulose, hydroxyethylcellulose, and magnesium aluminum Silicate, and the like. The industrial shading agent composition according to claim 1, wherein the antifoaming agent is at least one selected from the group consisting of a nonionic surfactant and a silicone antifoaming agent. The method of claim 1, wherein the preservative is selected from the group consisting of bistributyltin oxide, dibutyltin dilaurate and tributyltin fumarate, copper naphthenate, copper pentachlorophenol, zinc- (Methylsulfonyl) pyridine, di-chlorophenol, tri-chlorophenol, tetra-chlorophenol, penta-chlorophenol, Chlorophenol, p-chloro-m-cresol and p-chloro-m-xylenone, o-phenylphenol, 2- (4-thiazoyl) benzimidazole, Aminol-3-one and 1,2-benzointhiazolin-3-one, N- (trichloromethylthio) phthalimide, N- (dichlorofluoromethylthio) phthalimide, hexahydro -1,3,5-tris (2-hydroxyethyl-S-triazine), thio-2,2'-bis (benzomethyl amide) -tetrahydro 3,5-methylene -2H-1,3,5- triazin -2 Sy Sy-one, sodium benzoate and light-shielding industrial compositions characterized by using at least one selected from the group consisting of glutaraldehyde. The industrial shading agent composition according to claim 1, wherein the solvent is at least one selected from the group consisting of purified water and alcohol. An industrial light-shielding agent characterized in that the composition of claim 1 and purified water are mixed at a weight ratio of 1: 1 to 1: 9. 13. The industrial shading agent according to claim 12, wherein the industrial shading agent lowers the transmittance of ultraviolet rays and infrared rays. The industrial shading agent according to claim 12, wherein the industrial shading agent is applied to agricultural facilities.

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