CN109814185A - A kind of micro- composite membrane of large scale and preparation method thereof - Google Patents
A kind of micro- composite membrane of large scale and preparation method thereof Download PDFInfo
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- CN109814185A CN109814185A CN201910235419.8A CN201910235419A CN109814185A CN 109814185 A CN109814185 A CN 109814185A CN 201910235419 A CN201910235419 A CN 201910235419A CN 109814185 A CN109814185 A CN 109814185A
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- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 239000012528 membrane Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000012790 adhesive layer Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 30
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 22
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims description 44
- 239000011259 mixed solution Substances 0.000 claims description 14
- 239000000853 adhesive Substances 0.000 claims description 13
- 230000001070 adhesive effect Effects 0.000 claims description 13
- 239000011325 microbead Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 239000004005 microsphere Substances 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- FIHBHSQYSYVZQE-UHFFFAOYSA-N 6-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound C=CC(=O)OCCCCCCOC(=O)C=C FIHBHSQYSYVZQE-UHFFFAOYSA-N 0.000 claims description 2
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- ZDHCZVWCTKTBRY-UHFFFAOYSA-N omega-Hydroxydodecanoic acid Natural products OCCCCCCCCCCCC(O)=O ZDHCZVWCTKTBRY-UHFFFAOYSA-N 0.000 claims description 2
- QNODIIQQMGDSEF-UHFFFAOYSA-N (1-hydroxycyclohexyl)-phenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1(O)CCCCC1 QNODIIQQMGDSEF-UHFFFAOYSA-N 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 230000001965 increasing effect Effects 0.000 abstract description 5
- 239000003595 mist Substances 0.000 abstract 1
- 239000010408 film Substances 0.000 description 29
- 230000003287 optical effect Effects 0.000 description 8
- 238000005286 illumination Methods 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 4
- 239000012788 optical film Substances 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 208000012886 Vertigo Diseases 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007756 gravure coating Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 231100000889 vertigo Toxicity 0.000 description 2
- -1 SUO-5101): 75-80% Substances 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- KUDUQBURMYMBIJ-UHFFFAOYSA-N ethylene glycol diacrylate Substances C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000001053 micromoulding Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The invention proposes a kind of micro- composite membranes of large scale, including the first PET base material, the second PET base material and UV adhesive layer；Wherein, the lower surface of the first PET base material is evenly arranged with one layer of PMMA microballon；The upper surface of second PET base material is evenly arranged with 70-90 μm of diameter of the hemispherical micro- structure to differ in size；First PET base material with a thickness of 180-190 μm, the second PET base material with a thickness of 240-260 μm, UV adhesive layer with a thickness of 3-8 μm.The present invention also provides the preparation methods of the composite membrane.The composite membrane of the application obtains the raising of rigidity with biggish base material thickness, it can be solidified simultaneously by ultraviolet light twice and obtain the smallest UV adhesive layer thickness, improve the light transmission of composite membrane, and the refractive index of light is improved by way of the radius increasing micro- structure, the mist degree of composite membrane is also further improved by the PMMA microballon that light twice scatters.
Description
Technical Field
The present invention relates to an optical film which can be used in the optical display field, and more particularly, to a large-sized micro-transparent composite film having a large display area, such as a liquid crystal display, an illumination system, and a method for preparing the same.
Background
Various composite films are often required in the fields of optical display and illumination. Such as liquid crystal displays, televisions, etc., the size of the composite films used therein is becoming larger and larger. The most important problem of the existing large-sized composite film used in the fields of optical display, illumination and the like is uneven brightness, which is related to the type, shape and position of a light source on one hand and has great relevance to the quality of the composite film on the other hand. Good compound diaphragm can effective scattered light, can shield some to the lamp shadow of light source, therefore can reduce the requirement to showing luminance on the whole, the energy saving consumes, also can reduce the injury of bright light to eyes, avoids the user overuse to produce dizzy.
Chinese patent application CN 201720838343.4 discloses a micro-transparent intensifying composite optical film for a backlight module, which comprises a micro-transparent film, a prism film and an adhesive layer. This prior art will pass through the membrane and the prism membrane is compounded into a whole through the laminating, forms a little and increases light composite optical film that passes through that has independent structure, and it can satisfy the product ultra-thin market demand, is less than traditional diaphragm thickness greatly, and optical property is good, packaging efficiency is high, with low costs. In addition, the composite film of the prior art can also be used for enhancing the optical brightness of the micro-transmission light-enhanced composite optical film.
The above-mentioned prior art composite film has a certain advantage in light transmittance because the thickness is lower than that of the conventional film, but when it is used in a large-sized optical display field, it is used in a case where the film is insufficient in rigidity and is liable to warp, resulting in occurrence of moire and unevenness in brightness in a display region. In addition, since the composite film of the prior art is formed by combining the micro-transparent film and the prism film, there are some differences in brightness along the prism stripes and in the direction perpendicular to the prism stripes, and when the composite film is used on a small-sized display (such as a notebook computer screen), the problem of relatively horizontal viewing angle is not caused. However, in the large-scale optical display and illumination system, the brightness unevenness at different angles is hard to satisfy the user, and moreover, the cost is relatively high due to the combination of two different films, and the large-scale popularization and application are difficult in the large-scale optical display and illumination field.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a large-sized micro-permeable composite membrane and a method for preparing the same, so as to reduce or avoid the aforementioned problems.
In order to solve the technical problem, the invention provides a large-size micro-transparent composite film, which comprises a first PET base material, a second PET base material and a UV (ultraviolet) adhesive layer, wherein the UV adhesive layer is uniformly coated between the first PET base material and the second PET base material and is used for laminating and bonding the first PET base material and the second PET base material into a whole; the lower surface of the first PET substrate is uniformly provided with a layer of PMMA micro-beads; hemispherical micro-transparent structures with diameters of 70-90 μm and different sizes are uniformly arranged on the upper surface of the second PET substrate; the thickness of the first PET substrate is 180-190 μm, the thickness of the second PET substrate is 240-260 μm, and the thickness of the UV adhesive layer is 3-8 μm.
Preferably, PMMA micro-beads accounting for 0.3-0.5% of the total mass are uniformly distributed in the UV adhesive layer.
In addition, the invention also provides a preparation method of the large-size micro-transparent composite film, which comprises the following steps: providing a first PET substrate with the thickness of 180-190 mu m, and uniformly bonding a PMMA micro-bead on the lower surface of the first PET substrate; uniformly coating the mixed solution of the UV adhesive and the PMMA microspheres on the upper surface of the first PET substrate, and irradiating the mixed solution for 1 to 3 seconds by using ultraviolet light to reduce the fluidity of the mixed solution; covering a layer of second PET substrate with the thickness of 240-260 mu m on the upper surface of the first PET substrate coated with the mixed solution, irradiating by ultraviolet light for 4-6 seconds to enable the mixed solution to be cured to form a UV adhesive layer with the thickness of 3-8 mu m, and adhering the first PET substrate and the second PET substrate together through the UV adhesive layer; hemispherical micro-transparent structures with diameters of 70-90 μm and different sizes are formed on the upper surface of the second PET base material.
The utility model provides a complex film has obtained the improvement of rigidity with great substrate thickness, can obtain minimum UV gluing layer thickness through twice ultraviolet curing simultaneously, has improved the light transmission performance of complex film to improve the refracting index of light through the mode of the radius of increase micro-transparent structure, still further improved the haze of complex film through the PMMA microballon of twice light scattering.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,
FIG. 1 is a schematic diagram showing a structure of a large-sized micro-permeable composite membrane according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the steps of preparing the large-sized micro-permeable composite membrane shown in FIG. 1.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
Based on the problems of the prior art composite membrane, the present invention provides a large-sized micro-permeable composite membrane, which has a structure as shown in fig. 1, wherein a schematic structural diagram of the large-sized micro-permeable composite membrane according to an embodiment of the present invention is shown.
Referring to fig. 1, the large-sized micro-transparent composite film of the present application includes a first PET substrate 100, a second PET substrate 200, and a UV adhesive layer 300 uniformly coated between the first PET substrate 100 and the second PET substrate 200 to laminate and bond the two into a whole. Specifically, as shown in the figure, a layer of PMMA microbeads 11 is uniformly arranged on the lower surface of the first PET substrate 100; hemispherical micro-transparent structures 21 with diameters of 70-90 μm and different sizes are uniformly arranged on the upper surface of the second PET base material 200; the thickness of the first PET substrate 100 is 180-190 μm, the thickness of the second PET substrate 200 is 240-260 μm, and the thickness of the UV adhesive layer 300 is 3-8 μm.
The PMMA microspheres are transparent particles for brightness enhancement and scattering made of PMMA (polymethyl methacrylate), and have a particle diameter of 0.5-1um, which is a known technique and commercially available.
In order to solve the problem that the rigidity of the composite membrane in the prior art is not enough, the large-size micro-transparent composite membrane adopts the first PET base material 100 and the second PET base material 200 which are bonded into a whole in a compounding mode, wherein the thickness of the first PET base material 100 is preferably 188 micrometers, the thickness of the second PET base material 200 is preferably 250 micrometers, the thicknesses of the two layers of PET base materials are relatively large, and the large rigidity can be ensured to be obtained compared with the prior art. Of course, as the thickness increases, the light transmittance of the composite film is relatively reduced, so that the application further adopts various schemes to increase the brightness of the composite film.
First, the thickness of the intermediate UV adhesive layer 300 is controlled to be the minimum range in the present application, and the thickness of the UV adhesive layer 300 is preferably 5 μm. Because the light transmissivity of UV gluing agent is relatively poor for the PET substrate, therefore the whole light transmissivity of the too big UV gluing layer of thickness can greatly reduced composite diaphragm, therefore this application adopts special twice ultraviolet curing's mode (will further explain this later), greatly reduced UV gluing layer 300's thickness. For example, the thickness of the UV adhesive layer in the prior art generally needs to reach more than 30 μm to obtain good adhesion performance, because the wettability of the UV adhesive and the PET material is poor, the surface tension of the UV adhesive is high, and it is difficult to stably form a uniform coating structure on the surface of the PET material for a long time, so that the non-uniform area can be filled up as much as possible only by increasing the thickness of the coating layer, and the tension shrinkage of the coating surface can be kept for a long time during the operation process so as not to cause voids. Thus, the thickness of the UV adhesive layer of the prior art greatly affects the light transmission performance of the composite film.
In order to overcome the problem that the thickness of the UV adhesive layer is too large, after the UV adhesive is coated, one-time pre-curing operation is firstly carried out, namely, the fluidity of the UV adhesive is reduced by irradiating ultraviolet light for 1-3 seconds (preferably for 2 seconds), so that the problem that the surface of the coating shrinks to form a gap is not worried in the subsequent operation process, and therefore, the uniform adhesive coating can be formed for a long time by using the minimum amount of the UV adhesive. Thereafter, after the first and second PET substrates 100 and 200 are overlapped, the coating layer is completely cured by ultraviolet light irradiation for 4 to 6 seconds (preferably 5 seconds), and finally the first and second PET substrates 100 and 200 may be bonded together by the UV adhesive layer 300 having a minimum thickness of 3 to 8 μm.
In other words, the invention greatly reduces the thickness of the UV adhesive layer through a mode of ultraviolet light curing twice compared with the prior art, avoids the adverse effect of the overlarge thickness of the UV adhesive layer on the light transmission of the composite membrane, and improves the light transmission of the composite membrane.
Secondly, with the increase of the thickness of the PET substrate and the decrease of the thickness of the UV adhesive layer, the radius of the micro-transparent structure 21 on the upper surface of the second PET substrate 200 is adjusted by the present invention, and the radius is increased to a degree of 70-90 μm, and the radius of the micro-transparent structure of the prior art mentioned in the background section is only 12-20 μm, so that the micro-transparent structure 21 of the present invention greatly increases the refractive index to light compared with the prior art, so as to increase the brightness of the composite membrane through a larger refractive index, so as to compensate the problem of brightness reduction caused by the increase of the thickness of the composite membrane.
Furthermore, the radius of the micro-transparent structure 21 is increased, which may cause the brightness of light at the central position of each hemisphere of the micro-transparent structure 21 to exceed the brightness at the position between adjacent hemispheres, and the radius of the hemisphere is relatively increased, which may cause the non-uniform brightness phenomenon to be more obvious, although some non-uniform brightness problems may be alleviated by the hemispheres with different sizes in the micro-transparent structure 21, the non-uniform problem may be difficult to be solved completely due to the large radius of the hemispherical structure, and the excessive refractive index may also cause the problem of excessive focusing of the lamp shadow of the light source. In order to overcome the problem of uneven brightness after brightness enhancement, in another embodiment of the present application, PMMA micro beads accounting for 0.3-0.5% of the total mass are uniformly distributed in the UV adhesive layer 300 to provide scattering to light at the interlayer position of the two PET substrates, so that the light source image refracted by the micro-transparent structure 21 is as far away from one side of the light projection surface of the first PET substrate 100 as possible, thereby playing a role of shielding the light shadow of the light source, reducing the damage of the over-bright light to the eyes of the user, and avoiding the vertigo caused by the over-use of the user.
Finally, in order to further improve the light scattering and reduce the requirement on display brightness, the PMMA beads 11 are uniformly arranged on the lower surface of the first PET substrate 100, so that the second scattering of the emergent light is performed through the PMMA beads 11, and the light shadow of the light source can be thoroughly shielded by matching with the first scattering at the interlayer position, thereby further reducing the vertigo caused by the concentrated brightness and improving the haze of the composite membrane. And the outer surface is additionally provided with the anti-scratch performance of the composite diaphragm, static electricity can be reduced, and the efficiency of subsequent assembly operation of the diaphragm is improved.
In a specific embodiment of the present invention, the UV adhesive in the UV adhesive layer may be a UV adhesive containing acrylic resin, which is conventionally used for existing composite membranes, and may also be a UV adhesive preferably composed of the following components in percentage by mass: acrylic resin (e.g., SUO-5101): 75-80%, monomer HDDA (1, 6-ethylene glycol diacrylate): 10-15%, photoinitiator (1-hydroxycyclohexyl phenyl ketone): 5-10%, auxiliary agent BYK (leveling agent, BYK company, model 306): 2 to 3 percent.
The method for preparing the large-sized micro-permeation composite membrane of the present invention is described in detail with reference to fig. 2, wherein fig. 2 is a schematic view showing the steps for preparing the large-sized micro-permeation composite membrane of the present invention.
As shown in FIG. 2, a first PET substrate 100 with a thickness of 180-190 μm is provided, and a layer of PMMA micro beads 11 is uniformly adhered to the lower surface of the first PET substrate.
Then, by using a micro-gravure coating technique, a mixed solution of a UV adhesive and PMMA beads is uniformly coated on the upper surface of the first PET substrate 100, and the fluidity of the mixed solution is reduced by ultraviolet irradiation for 1 to 3 seconds.
Then, by the micro-gravure coating technology, a layer of second PET substrate 200 with a thickness of 240-260 μm is covered on the upper surface of the first PET substrate 100 coated with the mixed solution, the mixed solution is cured to form a UV adhesive layer 300 with a thickness of 3-8 μm by ultraviolet irradiation for 4-6 seconds, and the first PET substrate 100 and the second PET substrate 200 are adhered together by the UV adhesive layer 300.
Finally, hemispherical micro-transparent structures 21 with diameters of 70-90 μm and different sizes are formed on the upper surface of the second PET substrate 200 by using a micro-molding technology.
The main performance parameters of the large-size micro-transparent composite film obtained by the preparation method are shown in the following table:
to sum up, the complex film of this application has obtained the improvement of rigidity with great substrate thickness, can obtain minimum UV adhesive layer thickness through twice ultraviolet curing simultaneously, has improved the light transmissivity of complex film to improve the refracting index of light through the mode of the radius of increase micro-transparent structure, still further improved the haze of complex film through the PMMA microballon of twice light scattering.
It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (5)
1. A large-size micro-transparent composite film comprises a first PET base material (100), a second PET base material (200) and a UV adhesive layer (300) which is uniformly coated between the first PET base material (100) and the second PET base material (200) and is laminated and bonded into a whole; the PET base material is characterized in that a layer of PMMA microbeads (11) are uniformly arranged on the lower surface of the first PET base material (100); hemispherical micro-transparent structures (21) with diameters of 70-90 mu m and different sizes are uniformly arranged on the upper surface of the second PET base material (200); the thickness of the first PET substrate (100) is 190 μm and 180-.
2. The large-sized micro-transparent composite film according to claim 1, wherein PMMA micro beads are uniformly distributed in the UV adhesive layer (300) in an amount of 0.3 to 0.5% by mass of the total mass.
3. The large-size micro-transparent composite film according to claim 1 or 2, wherein the UV adhesive layer comprises the following UV adhesives in percentage by mass: acrylic resin SUO-5101: 75-80%, monomeric HDDA: 10-15%, photoinitiator 184: 5-10% and an auxiliary agent BYK: 2 to 3 percent.
4. A preparation method of a large-size micro-permeable composite membrane comprises the following steps:
providing a first PET substrate (100) with the thickness of 180-190 mu m, and uniformly bonding a layer of PMMA microbeads (11) on the lower surface of the first PET substrate;
uniformly coating the mixed solution of the UV adhesive and the PMMA microspheres on the upper surface of the first PET substrate (100), and irradiating the mixed solution for 1 to 3 seconds by using ultraviolet light to reduce the fluidity of the mixed solution;
covering a second PET substrate (200) with the thickness of 240-260 mu m on the upper surface of the first PET substrate (100) coated with the mixed solution, curing the mixed solution to form a UV adhesive layer (300) with the thickness of 3-8 mu m by ultraviolet irradiation for 4-6 seconds, and adhering the first PET substrate (100) and the second PET substrate (200) together through the UV adhesive layer (300);
hemispherical micro-transparent structures (21) with diameters of 70-90 μm and different sizes are formed on the upper surface of the second PET base material (200).
5. The method of claim 4, wherein the PMMA microspheres in the UV adhesive layer (300) account for 0.3-0.5% of the total mass of the UV adhesive layer (300).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111061089A (en) * | 2019-12-13 | 2020-04-24 | 武汉华星光电技术有限公司 | Display device |
| CN111319217A (en) * | 2020-03-13 | 2020-06-23 | 铜陵乐知科技服务有限公司 | Preparation process of novel environment-friendly high-transparency hot-melt composite film |
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| CN111319217A (en) * | 2020-03-13 | 2020-06-23 | 铜陵乐知科技服务有限公司 | Preparation process of novel environment-friendly high-transparency hot-melt composite film |
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Application publication date: 20190528 |