CN110908234B - Curing adhesive and projection screen thereof - Google Patents
Curing adhesive and projection screen thereof Download PDFInfo
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- CN110908234B CN110908234B CN201810988179.4A CN201810988179A CN110908234B CN 110908234 B CN110908234 B CN 110908234B CN 201810988179 A CN201810988179 A CN 201810988179A CN 110908234 B CN110908234 B CN 110908234B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
Abstract
A curing adhesive and a projection screen thereof are provided, wherein the curing adhesive comprises a curing adhesive main body, doped particles, a UV photoinitiator, a thermal curing agent and a curing adhesive auxiliary agent, and the curing adhesive auxiliary agent comprises a dispersing agent, a flatting agent, a defoaming agent and a polymerization inhibitor; the projection screen comprises a substrate and a Fresnel structure layer arranged on the substrate, wherein the Fresnel structure layer is formed by curing the curing adhesive. According to the invention, the UV photoinitiator and the thermal curing agent are used for replacing an oil coating used by a conventional light-resistant screen, so that the emission of VOC is reduced, and the environment-friendly function is realized; the projection screen has a simple structure, can control the thickness within the range of 150-300 mu m, realizes the manufacture of the ultrathin projection light-resistant curtain, reduces the production procedures of products and reduces the production cost.
Description
Technical Field
The invention relates to curing glue and a projection screen thereof, belonging to the technical field of display screen manufacturing.
Background
In the use of ultra-short-focus projection, the traditional white screen is easily interfered by ambient light, the contrast of the picture is not high in the bright light environment of a living room, and the color can not be well displayed. To improve the contrast of the picture, it is necessary to reduce the reflectance of the screen to ambient light while maintaining the gain of the screen as much as possible. The existing wire grid screen improves the ambient light contrast by a mode of absorbing light on one side and reflecting light on the other side, but the wire grid microstructure can not well collimate the light of a projector, and meanwhile, the white lambertian scattering coating adopted on the surface reduces the gain of the screen, so the improvement effect is very limited.
In addition, the existing coating formation process mainly adopts various coating modes such as spraying or silk-screen printing, and the process necessarily uses a large proportion of organic solvent mixture, such as anhydrous acetone, anhydrous xylene, anhydrous cyclohexanone, anhydrous butanone, ethyl acetate, anhydrous butyl acetate and the like. Such solvents cause Volatile Organic Compound (VOC) emissions during the manufacturing process and subsequent drying, posing a threat to the environment and to the health of personnel.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the curing adhesive and the projection screen thereof, and the UV photoinitiator and the thermal curing agent are used for replacing the oil paint used by the conventional light-resistant screen, so that the discharge of VOC is reduced, and the environment-friendly function is realized; the projection screen has a simple structure, can control the thickness within the range of 150-300 mu m, realizes the manufacture of the ultrathin projection light-resistant curtain, reduces the production procedures of products and reduces the production cost.
The technical problem to be solved by the invention is realized by the following technical scheme:
the invention provides a curing adhesive for forming a Fresnel structure layer of a projection screen, which comprises the following components in parts by weight:
the curing glue auxiliary agent comprises a dispersing agent, a flatting agent, a defoaming agent and a polymerization inhibitor.
In order to achieve curing, the UV photoinitiator has a UV absorption peak of 220nm to 380 nm.
In order to increase the absorption of ambient light, the reflectivity of the curing glue is 20-25%.
The curing glue main body comprises the following components in parts by weight:
20-25 parts by weight of acrylate resin/vinyl resin
20-30 parts of monomer diluent.
The doped particles comprise the following components in parts by weight:
10-20 parts of aluminum silver powder
10-25 parts by weight of carbon black
0.5-5 parts by weight of scattering particles.
The curing adhesive additive comprises the following components in parts by weight:
the invention also provides a projection screen, which comprises a substrate and a Fresnel structure layer arranged on the substrate, wherein the Fresnel structure layer is formed by curing the curing adhesive.
In order to ensure that the reflected light of the projector has a certain diffusion angle, the outer surface of the Fresnel structure layer is composed of a first incidence surface and a second incidence surface which are alternately arranged, and the first incidence surface is provided with a concave-convex structure.
Preferably, the height difference of the concavo-convex structure is 0 μm to 10 μm.
Preferably, the height difference of the concavo-convex structure is 2 μm to 5 μm.
Preferably, the thickness of the projection screen is 150 μm to 300 μm.
In conclusion, the UV photoinitiator and the thermal curing agent are used for replacing the oil paint used by the conventional photoscreen, so that the emission of VOC is reduced, and the environment-friendly function is realized; the projection screen has a simple structure, can control the thickness within the range of 150-300 mu m, realizes the manufacture of the ultrathin projection light-resistant curtain, reduces the production procedures of products and reduces the production cost.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic diagram of a circular Fresnel reflection structure;
FIG. 2 is a schematic diagram of a projection screen according to the present invention;
FIG. 3 is a schematic diagram of a projector for collimating light according to the present invention;
FIG. 4 is a schematic diagram of the relationship between the radius of the reflective structure layer and the first and second incident planes according to the present invention;
FIG. 5 is a diagram of the path of a portion of ambient light after it strikes the projection screen;
FIG. 6 is a graph of the intensity distribution of light rays at different scattering angles on a Lambertian reflecting surface;
FIGS. 7 a-7 d are optical simulation diagrams of different Fresnel structure layers;
FIG. 8 is a schematic view of a process for producing a projection screen according to the present invention;
FIG. 9 is a partial cross-sectional view of a projection screen of the present invention;
FIG. 10 is a graph of a hundred grid test of a projection screen according to the present invention.
Detailed Description
FIG. 1 is a schematic diagram of a circular Fresnel reflection structure; fig. 2 is a schematic structural diagram of a projection screen according to the present invention. As shown in fig. 1 and 2, the present invention provides a projection screen, which includes a substrate 10 and a fresnel structure layer 20 disposed on the substrate 10. The substrate 10 is made of one of polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), Polycarbonate (PC), polyvinyl chloride (PVC), and Polyimide (PI), and the transmittance of the substrate 10 is preferably (1% to 95%). The fresnel structure layer 20 is an annular fresnel reflection structure and is formed by a plurality of concentric rings, the cross section of each ring is triangular, and each triangle is formed by surrounding the bottom surface, the first incident surface a and the second incident surface b of the fresnel structure layer 20, that is, the outer surface (the surface far away from the substrate 10) of the fresnel structure layer 20 is formed by the first incident surface a and the second incident surface b which are alternately arranged. The first incident surface a mainly functions to reflect the projection light of the projector into the field of view of the audience, and the second incident surface b mainly functions to absorb the ambient light. The projection screen has simple structure and thickness of 150-300 microns.
FIG. 3 is a schematic diagram of a projector for collimating light according to the present invention; FIG. 4 is a schematic diagram of the relationship between the radius of the reflective structure layer and the first and second incident planes. As shown in FIG. 3, α is the projection ray l of the projector 1 Angle of illumination onto the fresnel-structure layer 20 (projection light l) 1 Angle between the projection screen and the normal of the plane on which the projection screen is located, hereinafter referred to as incident angle), and β is the projection light l of the projector 1 Angle (projection light l) reflected by the fresnel structure layer 20 1 After reflection, the light beam is reflected by the projection screenAngle between normal lines of the planes, hereinafter referred to as exit angle), theta 1 Is the angle between the first incident plane a and the plane of the projection screen, theta 2 The angle between the second incident plane b and the plane of the projection screen, and the distribution of the projector in the situation where θ is 2 Fixed, theta 1 The angle of (a) varies within the range of 5 to 50.
When the position of the projector and the viewer relative to the projection screen is known, the angle of incidence α of the projector and the angle β of the light reflected to the viewer's field of view are known, and θ can be determined from the law of refraction 1 ＝(α-β)/2。
So that the second incident surface b does not reflect the projection light l of the projector 1 At the same time, the second incident surface b will not emit the ambient light l 2 Reflected into the field of view of the viewer, θ 2 Preferably 70 to 90.
In addition, when the relative position of the projector and the projection screen is fixed, θ can be calculated 1 、θ 2 With the distribution of the radius of the reflective structure layer 3. As can be seen from fig. 4, in the case where the relative positions of the projector and the projection screen are fixed, in order to optimize the reflection of the projection light, as the radius of the fresnel structure layer 20 increases, θ 2 Remains unchanged, and theta 1 And correspondingly increases.
In order to maintain the collimation characteristic of the fresnel structure layer 20 without changing the inclination angle of the fresnel structure layer 20, the reflectivity of the fresnel structure layer 20 is preferably 10% to 40%, and more preferably 20% to 25%.
By reducing the reflectivity of the surface of the projection screen, the absorption of ambient light can be effectively increased, so that the black contrast gamma can be remarkably improved when an image of a starry sky or other black background in the night is displayed. Wherein the black contrast γ is defined as the ratio of the brightness of the ambient light impinging on the whiteboard to the brightness of the light impinging on the screen. Because the ambient light comes from all directions, the brightness of the screen surface reflection is approximately seen as a lambertian scattering surface. Namely, it is
Wherein E is Environment(s) ρ is the reflectivity of the projection screen, which is the illuminance of the ambient light.
For example, when the reflectance of the projection screen is 25%, the theoretical value of the black contrast is 4, which is already higher than that of a general light-resistant screen. In fact, since the projection screen surface is structured to be oriented most optimally to the light rays that are collimated in the projector direction (arranged to be advantageous for collimating the light rays in the projector direction), most ambient light rays will not enter the viewer's field of view after 1 reflection, for example to the floor or to both sides of the viewer, and therefore the actual black contrast will be higher than 4.
Another reason for improving the contrast of black is the 2 reflections of part of the ambient light on the surface of the projection screen, and fig. 5 is a path diagram of part of the ambient light after it is irradiated on the projection screen. As shown in fig. 5, a part of the ambient light is reflected to the first incident surface a after being irradiated on the second incident surface b, and then is reflected by the first incident surface a. When the reflectivity of the surface of the projection screen is low, such as 25%, the actual reflectivity of the ambient light is only about 6% due to the two reflections, and the low reflectivity of the ambient light can further improve the black contrast of the projection screen.
It should be added that the reflection rate of the projection screen surface is reduced, and the brightness of the projection light reflection is also reduced, however, in this embodiment, a gain of about 1.0 can still be generated by controlling the scattering angle of the fresnel structure layer 20.
FIG. 6 is a graph of the intensity distribution of light rays at different scattering angles on a Lambertian reflecting surface. As shown in FIG. 6, the intensity distribution of the Lambertian reflecting surface conforms to a cosine distribution, which is combined with a formula
It can be concluded that reducing the angle of diffusion increases the central light intensity when the reflected light fluxes are the same.
Specifically, the viewing angle of the white lambertian diffuse reflection is ± 60 °, and if the reflectance is 100%, a screen effect with a gain of 1.0 can be achieved; when the reflectivity is reduced to 25%, the gain of diffuse reflection is up to 0.25. For a television, the viewing angle is +/-20-30 degrees, so that the viewing requirements of a common family can be met, and the gain of the Fresnel structure layer 20 with the reflectivity of 25% can be improved to a level more than 1.0 by reducing the viewing angle. The reflection of the projection screen to the ambient light is effectively reduced while the central gain of the projection screen is ensured, so that the contrast of the whole projection screen against the ambient light can be improved.
In order to ensure that the Fresnel reflection structure has a viewing angle of +/-20-30 degrees and simultaneously prevent Fresnel mirror reflection, the first incidence surface a is provided with a concave-convex structure, and the height difference of the concave-convex structure is 0-10 mu m, preferably 2-5 mu m. The height of the concave portion in the concave-convex structure is a height perpendicular to the first incident surface a, the height of the convex portion in the concave-convex structure is a height perpendicular to the first incident surface a, and the height difference of the concave-convex structure is: the difference between the height of the recesses in the relief structure and the height of the protrusions in the relief structure can be produced by means of sand blasting + hydrofluoric acid etching or also by means of a corresponding mold. Under the design mode, the concave-convex structure can ensure that the reflected light of the projector has a certain diffusion angle, such as +/-20-45 degrees, and the second incident surface b can reflect more ambient light to the first incident surface a for secondary absorption while absorbing the ambient light, so that the contrast effect is improved, and the contrast is improved by 5 percent.
Fig. 7 a-7 d are optical simulation diagrams of different fresnel structure layers. When the optical properties of the first incident surface a and the second incident surface b of the fresnel structure layer 20 are both set to be diffuse reflection (concave-convex structures are provided on the first incident surface a and the second incident surface b), the simulation result of the projection light is shown in fig. 7a, and the simulation result of the ambient light is shown in fig. 7 c; when the optical property of the first incident surface a of the fresnel structure layer 20 is set to diffuse reflection and the second incident surface b is set to specular reflection (the first incident surface a is provided with the concave-convex structure, and the second incident surface b is not provided with the concave-convex structure), the simulation result of the projection light is shown in fig. 7b, and the simulation result of the ambient light is shown in fig. 7 d. As shown in fig. 7a and 7b, the gains under the two structures are almost the same because the projection light mainly acts on the first incident surface a, so that the optical property of the second incident surface b has no influence on it, and because the ambient light comes from above the projection screen, a part of it will be incident on the second incident surface b of the fresnel structure layer 20, as can be seen from fig. 7c and 7d, when the second incident surface b is set to be specular reflection, the light reflected to the viewer's visual field direction is obviously reduced, and the contrast is improved.
In order to ensure that the reflectivity of the Fresnel structure layer 20 is 10% -40% and further ensure the contrast of a projection screen, the invention also provides a curing adhesive, wherein the reflectivity of the curing adhesive is 20% -25%, and the curing adhesive comprises the following components in parts by weight:
the curing glue auxiliary agent comprises a dispersing agent, a flatting agent, a defoaming agent and a polymerization inhibitor.
The curing glue main body comprises the following components in parts by weight:
20-25 parts by weight of acrylate resin/vinyl resin
20-30 parts of monomer diluent.
The doped particles comprise the following components in parts by weight:
10-20 parts of aluminum silver powder
10-25 parts by weight of carbon black
0.5-5 parts by weight of scattering particles.
The curing adhesive additive comprises the following components in parts by weight:
specifically, the acrylate is one or more of polyurethane acrylate, polyester acrylate, polyether acrylate and epoxy acrylate.
The monomer diluent is acrylic acid phenoxy ethyl ester (POEA) or methacrylic acid isobornyl ester (IBOA) (monofunctional, which ensures lower shrinkage after structure molding).
The aluminum silver powder can be in a floating type or a non-floating type, and the aluminum silver powder is in a flake shape, and the particle size is 1-5 mu m, preferably 1-3 mu m.
The carbon black is one of aniline black, carbon black particles and iron black, and the particle size is preferably 1 mu m.
The scattering particles are one or more of nano titanium dioxide, nano silicon dioxide and ultrafine calcium carbonate.
The UV absorption peak value of the UV photoinitiator (ultraviolet photoinitiator) is 220nm-380nm, such as cleavage type free radical photoinitiators of 184, TPO, 651 and DEAP, or hydrogen abstraction type free radical photoinitiators.
The thermal curing agent is a heating curing agent and comprises aliphatic amines and aromatic amines, and preferably aromatic amines.
The dispersing agent is one or more of sodium hexametaphosphate, sodium pyrophosphate, sodium silicate and fatty alcohol.
The leveling agent is organic silicon or fluorocarbon.
The defoaming agent is one or more of ethanol, n-butanol, organic silicon ester and mineral oil.
The polymerization inhibitor is one or more of phenothiazine, p-hydroxyanisole, hydroquinone, phenyl naphthylamine and p-tert-butyl catechol.
Under the UV wave band, the photoinitiator absorbs the energy of the ultraviolet wave band and performs chain reaction with the acrylate main body/monomer diluent.
At present, the efficiency of a high-pressure polar lamp (Hg lamp) in the industry is only 15% of the highest, carbon black is added in the curing adhesive for light absorption, and aluminum silver powder is used for light reflection, so that the curing adhesive is difficult to completely react by a single UV light source, and the complete curing of the curing adhesive and the thickness of the curing adhesive are in an index relationship, and the effect of complete curing is difficult to achieve by using the structural height (20-100 mu m) of the existing projection screen. The thermosetting glue reacts by absorbing heat energy, and the reaction speed of the single thermosetting glue is lower, which is not beneficial to the mass production of products and the demoulding and transfer printing of structures.
The curing glue comprises a UV photoinitiator and a thermal curing agent, wherein the UV photoinitiator finishes a semi-curing reaction by absorbing an ultraviolet band of an Hg lamp, so that a structure can be formed and can easily fall off from a mold, at the moment, the thermal curing agent also carries out a curing reaction by absorbing heat of the Hg lamp, namely, the thermal curing reaction is also continuously carried out in the photo-curing process, and the reaction is finished after about 1-2 hours. Because the Fresnel structure layer 20 is positioned on the viewing surface, the physical properties of the structure surface, such as hardness, wear resistance, scratch resistance and the like, directly influence the daily use and maintenance of consumers, a completely-reacted adhesive layer structure is of great importance to the subsequent stability of products, the curing adhesive in the invention comprises the UV photoinitiator and the thermal curing agent, and the processed Fresnel structure layer can achieve the physical properties and can also improve the product performance of the projection screen.
The production process of the curing adhesive will be described with reference to the following specific embodiments.
Firstly, stirring 25 parts by weight of polyurethane acrylate and 20 parts by weight of flaky aluminum silver powder (with the particle diameter of 1 mu m) at normal temperature to obtain a first matrix;
adding 20 parts by weight of nigrosine into the first matrix, and grinding the mixture by using a grinder until the nigrosine is completely dispersed;
stirring 25 parts by weight of IBOA, 2 parts by weight of UV photoinitiator (184 cyclohexyl benzophenone), 2 parts by weight of thermal curing agent (aliphatic amine), 1 part by weight of titanium dioxide particles (with the particle size of 3 mu m), 1.5 parts by weight of dispersant, 1 part by weight of defoaming agent, 1 part by weight of polymerization inhibitor and 1.5 parts by weight of flatting agent at normal temperature, and uniformly stirring to obtain a second matrix;
and adding the first matrix into the second matrix, and uniformly stirring to obtain the curing adhesive.
FIG. 8 is a schematic view of a process for producing a projection screen according to the present invention. The method for manufacturing the projection screen according to the present invention will be described with reference to fig. 8. First, a curing adhesive is coated on the substrate 10, and the curing adhesive is processed into a fresnel reflection structure by using a Mold 50 (which may be Hard Mold/soft Mold), and is cured by using a UV curing device 30 (preferably, a high-pressure polar lamp, such as a Hg lamp) to form the fresnel structure layer 20 on the substrate 10.
The concave-convex structure on the first incident surface a of the fresnel structure layer is processed and manufactured by the mold 50, and the original mold is a structure with concave-convex surface immediately.
In the actual production process, due to the influence of various factors, a small amount of un-reacted UV photoinitiator, thermal curing agent, acrylate resin, diluent, and the like may remain in the projection screen, and also the UV photoinitiator, thermal curing agent, acrylate resin, and diluent may be completely reacted, and the UV photoinitiator, thermal curing agent, acrylate resin, and diluent are not present in the projection screen.
FIG. 9 is a partial cross-sectional view of a projection screen of the present invention; FIG. 10 is a graph of a hundred grid test for a projection screen of the present invention, wherein the adhesion for the hundred grid test is 5B. The projection screen obtained by the process directly has the appearance characteristics of absorption and reflection, the gain is 1.0, the contrast is 8.2, the visual angle is 46 degrees, and the reflectivity of the curing adhesive is 22 percent.
The curing adhesive disclosed by the invention utilizes the UV photoinitiator and the thermal curing agent to replace an oily coating used by a conventional light-resistant screen, so that the emission of VOC is reduced, and the environment-friendly function is realized; the projection screen has a simple structure, can control the thickness within the range of 150-300 mu m, realizes the manufacture of the ultrathin projection light-resistant curtain, reduces the production procedures of products and reduces the production cost.
Claims (9)
1. The curing adhesive is used for forming a Fresnel structure layer of a projection screen and is characterized by comprising the following components in parts by weight:
the curing glue auxiliary agent comprises a dispersing agent, a flatting agent, a defoaming agent and a polymerization inhibitor;
the reflectivity of the curing adhesive is 20% -25%, and the curing adhesive main body comprises the following components in parts by weight:
20-25 parts by weight of acrylate resin/vinyl resin
20-30 parts of monomer diluent.
2. The curable adhesive of claim 1, wherein the UV photoinitiator has a UV absorption peak of 220nm to 380 nm.
3. The curing glue of claim 1, wherein the doped particles comprise the following components in parts by weight:
10-20 parts of aluminum silver powder
10-25 parts by weight of carbon black
0.5-5 parts by weight of scattering particles.
4. The curing adhesive as claimed in claim 1, wherein the curing adhesive auxiliary comprises the following components in parts by weight:
5. a projection screen, characterized in that, the projection screen comprises a substrate and a Fresnel structure layer arranged on the substrate, the Fresnel structure layer is formed by curing the curing adhesive according to any one of claims 1 to 4.
6. The projection screen of claim 5 wherein the outer surface of the Fresnel structure layer is comprised of alternating first and second entrance surfaces, the first entrance surface having a relief structure.
7. The projection screen of claim 6 wherein the relief structure has a height differential of 0 μm to 10 μm.
8. The projection screen of claim 7 wherein the relief structure has a height differential of 2 μ ι η to 5 μ ι η.
9. The projection screen of claim 5 wherein the projection screen has a thickness of 150 μ ι η to 300 μ ι η.
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| CN201810988179.4A CN110908234B (en) | 2018-08-28 | 2018-08-28 | Curing adhesive and projection screen thereof |
| PCT/CN2019/076614 WO2020042560A1 (en) | 2018-08-28 | 2019-03-01 | Curing adhesive and projection screen thereof |
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| CN201810988179.4A CN110908234B (en) | 2018-08-28 | 2018-08-28 | Curing adhesive and projection screen thereof |
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| CN110908234B true CN110908234B (en) | 2022-08-02 |
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| TWI742592B (en) * | 2020-03-30 | 2021-10-11 | 弘勝光電股份有限公司 | Structure of short-focus anti-light curtain |
| CN113493636B (en) * | 2020-04-07 | 2023-12-01 | 深圳光峰科技股份有限公司 | Projection reflection screen paint and preparation method thereof |
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| CN110908234A (en) | 2020-03-24 |
| WO2020042560A1 (en) | 2020-03-05 |
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