CN111548693A - Coating liquid composition for VOC-free image formation - Google Patents
Coating liquid composition for VOC-free image formation Download PDFInfo
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- CN111548693A CN111548693A CN201910144707.2A CN201910144707A CN111548693A CN 111548693 A CN111548693 A CN 111548693A CN 201910144707 A CN201910144707 A CN 201910144707A CN 111548693 A CN111548693 A CN 111548693A
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/08—Homopolymers or copolymers of acrylic acid esters
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K3/20—Oxides; Hydroxides
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- C08K2003/2237—Oxides; Hydroxides of metals of titanium
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Abstract
The invention provides a coating liquid composition for forming VOC-free image for rear projection type beam projector screen. The coating liquid composition includes: a water-soluble acrylic polymer, a hydrophilic glycol having a hydrophilic segment, a nonionic emulsifier, hollow nano titanium oxide, wet-process nonspherical porous silica, and water.
Description
Technical Field
The present invention relates to a VOC-free coating liquid composition for image formation, which is used for a rear projection type beam projector screen and which has a Volatile Organic Compound (VOC) close to zero.
Background
In the rear projection type beam projector screen, a technique is used in which after a translucent coating material is applied to a transparent base material, various random reflections and low reflections are generated due to the particle structure and refractive index, and an image for image formation is formed on a coating film when a light beam is projected. In a screen coated with a special coating material, an image for image formation can be displayed in various places, not in the conventional high-priced LCD or LED display.
With the applicability of projector screens, there is a need to provide mobility, diversification of size, ease of disposal, ease of formation of screen coating films, and the like for the screens.
In addition, in order to manufacture a projector screen, the coating liquid is applied to a substrate to be coated, and 70% or more of the work is performed indoors.
Therefore, products used in construction sites are potentially dangerous for accidents such as fire, suffocation, etc. due to Volatile Organic Compounds (VOCs) contained therein, and accidents frequently occur in practice.
In order to achieve higher screen quality, attempts have been made to coat the screen with an adhesive sheet, paint, optical material, or the like, but these have actually caused high costs, hazardous VOC emissions when coated, and fire hazards. In addition, in order to manufacture a screen on a large glass, a large amount of VOC is used for disposal of the coating liquid, which causes environmental pollution and accidents.
Under the circumstances where the above-described necessity is required, the invention technology of a screen coating processing system has been developed which utilizes a technology for forming an image for image formation on a coating film in projection of a light beam and realizes a composite property such as coating, adhesion, welding of a special coating material by using the special coating material.
Disclosure of Invention
The purpose of the present invention is to provide a VOC-free coating material composition for image formation, which can be used in a safe manner by forming a coating liquid for screen image formation by a rear projection type beam projector from an environmentally friendly coating composition in a coating process for constructing a screen having high visibility based on an image for image formation projected by a beam projector, can be removed by using only water when the application is discarded, and has excellent economical efficiency.
In order to achieve the above object, a coating liquid composition for VOC-free image formation according to an aspect of the present invention is used for a rear projection type beam projector screen, and includes: a water-soluble acrylic polymer, a hydrophilic glycol having a hydrophilic segment, a nonionic emulsifier, hollow nano titanium oxide, wet-process nonspherical porous silica, and water.
Specific features of other embodiments are included in the detailed description and the drawings.
According to the present invention, a beam projector screen can be safely and rapidly installed by using the eco-friendly coating liquid composition in a coating process of constructing a highly recognizable screen based on an image for image formation projected by a beam projector. Thus, it can be applied to various presentation screens or outdoor advertising boards, etc., which can realize mass-type commercial applicability. In addition, when the water-based paint is discarded, the water-based paint can be easily removed by using only water, and the water-based paint has excellent economical efficiency and is easily popularized.
Drawings
Fig. 1 is an enlarged view of a cross section of a coating film of the VOC-free image-forming coating liquid composition applied to a substrate, the cross section being taken perpendicular to a plane applied to the substrate.
Detailed Description
The coating liquid composition for VOC-free image formation for use in a rear projection type beam projector screen according to an embodiment of the present invention includes: a water-soluble acrylic polymer, hydrophilic ethylene glycol having a hydrophilic segment (segment), an environmentally friendly nonionic emulsifier, hollow nano titanium oxide, wet-process nonspherical porous silica, and water.
In the above-described water-soluble acrylic polymer, two or more acrylic monomers are used in combination, and the ratio thereof can be combined and synthesized in various ways.
The acrylic monomer that can be used in the present invention may be any acrylic monomer known to those skilled in the art, and is not particularly limited in the present invention.
The following chemical formula 1 may be a water-diluted acrylic resin (water reduced acrylic resin), and in the following chemical formula 1, the monomer bonded with R2, oxygen, carbon, etc. may be exemplified by alkyl (meth) acrylate (wherein the alkyl group is an alkyl group having 1 to 18 carbon atoms), and the monomer bonded with R3, oxygen, carbon, etc. may be exemplified by hydroxyalkyl (meth) acrylate (wherein the alkyl group is an alkyl group having 1 to 12 carbon atoms).
In this case, in the following chemical formula 1, R1 may be hydrogen or methyl (CH3group), R2 may be alkyl (alkyl group) or hydroxyethyl (hydroxy alkyl group), R3 may be alkylphenyl (alkyl phenyl group), and R4 may be trialkyl (tri alkyl group). The alkyl group in R2, R3 and R4 may be an alkyl group having 1 to 4 carbon atoms.
In the following chemical formula 1, when R is CH3, it is named "methacrylic acid", and when R is H, it is named "acrylic acid".
Specific examples of the acrylic monomer include: alkyl (meth) acrylates such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, octyl methacrylate, and octadecyl methacrylate. Specific examples of the acrylic monomer include: acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, hydroxyethyl acrylate, hydroxyethyl methacrylate, and the like.
Two or more kinds of acrylic monomers may be used in combination. Specifically, a combination of methyl methacrylate and butyl acrylate, methyl methacrylate/2-ethylhexyl acrylate, methyl methacrylate/butyl acrylate/2-ethylhexyl acrylate, and the like can be used.
The acrylic polymer may be synthesized by combining two or more of the above-mentioned acrylic monomers, and the ratio thereof may be combined and synthesized in various ways.
This component is a main component for forming a coating film for forming an image by projection with a projector. The water-soluble acrylic polymer may have a structure of the following chemical formula 1 containing a carboxylate. The water-soluble carboxylate water-soluble polymer is a water-soluble carboxylate water-soluble polymer which can be easily peeled from a substrate by swelling (swelling) with water without using an organic solvent which is a VOC substance when the polymer is discarded after coating, and the amount of the carboxylate may be 20 to 40% based on the solid content. The water-soluble acrylic polymer has a glass transition temperature of 10 ℃ to-10 ℃, a weight-average molecular weight of 5,000 to 50,000, and a solid content of 35 to 55%, and can be used in an amount (content) of 36 to 56% by weight based on the total weight of the coating liquid composition (hereinafter, the total weight is the total weight of the coating liquid composition).
Chemical formula 1 shows the following molecular structure.
[ chemical formula 1 ]
Hydrophilic glycols have a hydrophilic segment and have a formula such as HO-CNH 2N-OH. The function of the hydrophilic coating makes the coating soft, and the hydrophilic coating has a function of contributing to easy peeling of the coating. The hydrophilic ethylene glycol may be diethylene glycol, propylene glycol, 1, 4-butanediol, 1, 3-butanediol, ethylene glycol, dipropylene glycol, 2-methyl-1, 3-propanediol (MP diol), or the like, and at least one of these is preferably used, and two or more thereof may be used in combination. In the above-mentioned molecular formula of the hydrophilic ethylene glycol, N may be in the range of 2 to 4, and the content of the hydrophilic ethylene glycol may be about 6 to 12% by weight based on the total weight.
The environment-friendly nonionic emulsifier induces activation of the substrate and the interface to enable smooth coating of the coating liquid and also plays a role of imparting hydrophilicity to the entire structural components having insufficient hydrophilicity. The nonionic emulsifier has the following chemical formula 2, n may be an integer of 1 to 10, and m may be an integer of 10 to 20. The arrangement in parentheses (chemical formula 3, chemical formula 4) is in the form of a block. In chemical formula 2, R1The alkyl group may be an alkyl group having 1 to 4 carbon atoms. Overall, HLB (Hydrophile-Lipophile Balance) can be 10-18, and that of nonionic emulsifierThe content may be 1.6 to 5.0 wt% based on the total weight.
[ chemical formula 2 ]
[ chemical formula 3 ]
[ chemical formula 4 ]
The nano titanium oxide of the hollow structure is a hollow structure having an empty interior, which is divided into a housing part and an internal hollow part forming an air layer, and effectively scrambles visible light projected from a beam projector by using a difference in refractive index between the housing and the interior. In order to obtain high antireflection performance, it is necessary to provide a high refractive index material layer in an intermediate layer between the substrate and the low refractive index material layer, thereby realizing antireflection performance of nano titanium oxide (refractive index: 2.4) having a high refractive index. As a main component for clearly forming an image on a screen coating film by utilizing double random reflection by recombination refraction and a significant difference in refractive index between a base material and a low refractive material layer (silicon Oxide: about 1.4), a hollow nano Titanium Oxide (nano Titanium Oxide) is used in the present invention. The average particle diameter of the nano titanium oxide is 100 to 1000nm, and the content thereof may be 8 to 22 wt% based on the total weight (see FIG. 1).
The wet nonspherical porous silica has an amorphous irregular particle structure and a porous form, and the particle diameter thereof may have an average particle size of 1 μm to 10 μm. Accordingly, it is experimentally effective to reduce the reflectance by causing the spurious reflection by the refractive index difference from the hollow nano titanium oxide. It causes extinction and compound random reflection, thereby showing the effect of forming a clearer image for reducing eye fatigue together with the hollow nano titanium oxide. Further, since the component contains a small amount of nano metal impurities such as aluminum, calcium, iron, and the like, the complex random reflection effect is additionally exhibited without using an expensive complex metal oxide dispersion liquid, and thus an economical coating liquid composition can be realized.
The content of the non-spherical porous silica in the wet method may be 8 to 22 wt% based on the total weight.
In addition to the above-mentioned components, an ultraviolet stabilizer, a dispersant, an antifoaming agent, a stabilizer, a leveling agent, a gas absorber, a moisture absorber, an adhesion promoter, a catalyst, a wetting agent, a thickener, a rheology (rheology) control agent, a preservative, an antifreeze, an anti-virus agent, a pH adjuster, a rust inhibitor, an ultraviolet absorber, an antioxidant protective colloid, a film former, a plasticizer, and the like, which are used in a general water-soluble coating material exposed to sunlight, may be added to the coating liquid composition as needed, and the scope thereof is not particularly limited in the present invention.
As shown in fig. 1, by applying the VOC-free image-forming coating liquid composition of the present invention to a portion projected by a beam projector, the transmittance of light on the opposite side of the projected beam projector is low, and the gloss is reduced by performing complex refraction. In addition, the effect of recognizability can be improved and a comfortable image can be viewed through various spurious reflections. In fig. 1, the spherical particles in the black part are amorphous porous silica, and the spherical particles in the inner and outer phase regions are structures showing nano titanium oxide, which exhibit an effect of reducing the reflectance corresponding to the difference in refractive index and increasing the visibility by the complex random reflection. The coating film exhibiting such effects can realize a stable and highly recognizable image on the front and rear surfaces in a projection projector.
Unlike the prior art in which images are viewed from the rear, the screen using the coating liquid composition of the embodiment of the present invention is a rear projection type screen in which an image is formed, and thus images can be viewed on the front and rear sides.
The components of the coating liquid compositions of the clear examples are shown by adjusting the formulation of the coating liquid compositions into specific examples (table 1) and comparative examples (table 2) based on specific and detailed descriptions.
Hereinafter, the preparation method and the apparatus used, the test conditions, the kind of the test piece, the specification of the test piece, and the test method for the specific experiment performed in the following tables 1 and 2 will be described.
1. Method for producing coating liquid composition (comparative examples, examples same, common)
After resin and liquid raw materials are put into a cylindrical paint production container, uniformly stirred at 500-1000 RPM for 30 minutes by a dissolver (dispolver) capable of realizing high-speed dispersion, then sequentially put in silicon oxide and hollow nano titanium oxide, and dispersedly stirred at 1200-1700RPM for 2 hours, thereby preparing the coating liquid composition for forming the VOC-free image.
2. Base material: size of glass plate: 450mm 600mm, thickness 3mm
3. Coating method for screen for projector
(1) Using a coating tool: planetary roller (used for thinning 100% water-soluble paint or coating film)
(2) Dry coating thickness: 30 to 40 μm (twice for the first coating and 60 minutes for the second coating)
(3) Drying time (24 hours at 25 ℃ C.)
(4) Beam projectors used: 3000ANSI specification
(5) Projection distance: 100CM
4. Evaluation method
(1) Basic physical characteristics
1) Viscosity measurement
Using a Brookfield Low viscosity Meter LVT-1+ or Ford cup
2) Dryness measurement
The tack-free condition was confirmed at 10 minute intervals at 25 ℃ and the minimum elapsed time to achieve tack-free was recorded
(2) Physical properties of important applications
1) Adhesion A, B (evaluation of easiness of removal)
The adhesion (adhesion a) of the screens for beam projectors of examples and comparative examples was evaluated by a cross cut test (ASTM D3359), and after spraying water on the surfaces thereof to contact a hydrophilic solvent, the adhesion (adhesion B) was evaluated by the same method.
In the translucent layer, the adhesion to the substrate is 5B or more in the measurement according to ASTM D3359, and after the translucent layer is brought into contact with the hydrophilic solvent, the adhesion to the substrate is 0B or less in the measurement according to ASTM D3359.
2) Evaluation of visible light transmittance
JIS K7361 Standard measurement
A measuring device: TINTER METER TM-100
3) HAZE measurement
JIS K7361 Standard measurement
A measuring device: NDH-5000W
4) Gloss measurement (60 degree)
JIS K7361 Standard measurement
A measuring device: measuring instrument YG-60 or TQC GLOSS METER
5)TVOC
Which is a detected amount of total volatile organic compounds, the amount of volatile organic compounds contained in 1000ml of the coating liquid composition before coating a screen
Hereinafter, the present invention will be described in more detail by way of examples through various experiments, but the following examples are only for illustrating the present invention and the scope of the present invention is not limited thereto.
[ TABLE 1 ]
Table 1: examples of the coating liquid composition for VOC-free image formation and comparative test structure of rear projection type beam projector screen using the same
[ TABLE 2 ]
Table 2: comparative example of coating liquid composition for VOC-free image formation and comparative test results of rear projection type beam projector screen using the same
As described above, the VOC-free coating material composition for image formation can form a coating film that constitutes a screen with high visibility of an image for image formation by an easy coating operation. In particular, since it is an environmentally friendly coating liquid composition, a beam projector screen can be safely and rapidly installed, has excellent economy, and can be suitably used for an ultra-large screen. Further, when the water-based paint is discarded, the water-based paint can be easily removed by using only water, and thus the paint is safe and has excellent economical efficiency.
Those skilled in the art to which the invention pertains can implement various applications and modifications within the scope of the present invention based on the above-described contents.
The same applies to the drying process of a coating film obtained by coating a coating composition in order to form a coating film from the coating liquid composition of the present invention, and the drying process may also be performed under heating.
Claims (5)
1. A coating liquid composition for forming a VOC-free image for use in a rear projection type beam projector screen,
the method comprises the following steps:
a water-soluble acrylic polymer, hydrophilic ethylene glycol having a hydrophilic segment, a nonionic emulsifier, hollow nano titanium oxide, wet-process nonspherical porous silica, and water.
2. The VOC-free image forming coating liquid composition according to claim 1,
the water-soluble acrylic polymer has a structure of the following chemical formula 1, wherein the carboxylate is 20-40% by solid content, the glass transition temperature of the water-soluble acrylic polymer is 10-10 ℃, the weight average molecular weight of the water-soluble acrylic polymer is 5,000-50,000, the solid content of the water-soluble acrylic polymer is 35-55%, the content of the water-soluble acrylic polymer is 36-56% by weight based on the total weight of the coating liquid composition,
chemical formula 1
Wherein R1 is hydrogen or methyl, R2 is alkyl or hydroxyethyl, R3 is alkylphenyl, R4 is trialkyl, and the alkyl groups in R2, R3 and R4 are alkyl groups having 1 to 4 carbon atoms.
3. The VOC-free image forming coating liquid composition according to claim 1,
the nonionic emulsifier has a structure of the following chemical formula 2, n is an integer of 1 to 10, m is an integer of 10 to 20, HLB is 10 to 18, the content of the nonionic emulsifier is 1.6 to 5.0% by weight based on the total weight,
chemical formula 2
Wherein R is1The alkyl group is an alkyl group having 1 to 4 carbon atoms.
4. The VOC-free image forming coating liquid composition according to claim 1,
the hollow nano titanium oxide has an average particle diameter of 100 to 1000nm, and the content of the hollow nano titanium oxide is 8 to 22 wt% based on the total weight.
5. The VOC-free image forming coating liquid composition according to claim 1,
the wet-process nonspherical porous silica has an average particle size of 1 to 10 μm in a porous structure, and the content of the wet-process nonspherical porous silica is 8 to 22 wt% based on the total weight.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020190015028A KR20200097533A (en) | 2019-02-08 | 2019-02-08 | Voc free-coating liquid composition for image formation used in rear projection type beam project screen |
| KR10-2019-0015028 | 2019-02-08 |
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| CN111548693A true CN111548693A (en) | 2020-08-18 |
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| CN201910144707.2A Pending CN111548693A (en) | 2019-02-08 | 2019-02-27 | Coating liquid composition for VOC-free image formation |
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| KR102398916B1 (en) * | 2021-11-19 | 2022-05-17 | 구영모 | Coating liquid composition for image formation and screen for image formation |
Citations (6)
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|---|---|---|---|---|
| CN1934140A (en) * | 2004-03-08 | 2007-03-21 | 生态涂料公司 | Environmentally friendly coating compositions and coated articles and coating methods and process and assemblages thereof |
| CN101292002A (en) * | 2005-10-18 | 2008-10-22 | 关西涂料株式会社 | Aqueous primer composition and method for applying same |
| CN101328238A (en) * | 2007-06-19 | 2008-12-24 | 大日精化工业株式会社 | Pigment dispersants, their production process, and their use |
| KR20100081634A (en) * | 2009-01-06 | 2010-07-15 | 삼화페인트공업주식회사 | Insulative coatiing composition for non-oriented electric steel sheet and manufacturing method thereof |
| CN102959000A (en) * | 2010-09-17 | 2013-03-06 | 大金工业株式会社 | Acryl-fluorine composite polymer particles, and aqueous dispersant |
| CN107037514A (en) * | 2012-03-02 | 2017-08-11 | 三菱制纸株式会社 | The rear projection screen that can be had an X-rayed |
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- 2019-02-08 KR KR1020190015028A patent/KR20200097533A/en not_active Application Discontinuation
- 2019-02-27 CN CN201910144707.2A patent/CN111548693A/en active Pending
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