CN113174079B - Scratch-resistant optical reflection film and preparation method thereof, backlight module and liquid crystal display panel - Google Patents
Scratch-resistant optical reflection film and preparation method thereof, backlight module and liquid crystal display panel Download PDFInfo
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Abstract
The invention provides an anti-scratch optical reflecting film and a preparation method thereof, a backlight module and a liquid crystal display panel. The scratch-resistant optical reflecting film provided by the invention comprises: the base layer is compounded on the scratch-resistant layer on one side surface of the base layer; the scratch-resistant layer is a foaming film layer formed by the following raw materials: 16.8-17.8 wt% of resin film; 2.9 to 3.5 weight percent of curing agent; 0.6wt% -1.4 wt% of foaming agent; 0.65wt% -1.20 wt% of assistant; the balance of solvent. The reflecting film provided by the invention can reduce the falling risk, improve the scratch resistance of the light guide plate and the reflecting film, promote the reflection of light rays and avoid losing the reflection effect of the reflecting film.
Description
Technical Field
The invention relates to the field of optical materials, in particular to an anti-scratch optical reflecting film and a preparation method thereof, a backlight module and a liquid crystal display panel.
Background
A backlight unit (BLU) is one of the key components of a liquid crystal display panel, and functions to provide sufficient brightness and uniformly distributed light sources so that it can normally display images. The backlight module generally comprises a light source, a reflective film, a light guide plate, and an optical film (a diffusion film, a brightness enhancement film).
The reflecting film is a part of the material of the backlight module, is positioned at the bottom of the backlight module and below the light guide plate, and has the function of reflecting light leaking to the lower part through the light guide plate back, thereby achieving the functions of reducing light loss and increasing the brightness of the backlight module.
The main material of the light guide plate used in the backlight module is polymethyl methacrylate (acrylic), the surface pencil of the light guide plate has high hardness and good stiffness, but the light guide plate is expensive, poor in flexibility and difficult to process. In order to save the cost of the backlight module, the material of the light guide plate has been gradually changed into polyacrylate organic-inorganic nanocomposite (MS) and Polycarbonate (PC), which have good flexibility and are convenient for processing and production, but the pencil hardness on the surface of the light guide plate is reduced, and the light guide plate is more likely to be scratched, crushed and the like, so that the reflective film is required to avoid scratching the lower surface of the light guide plate during the assembly and transportation processes.
The reflective film is mainly divided into a white polyester reflective film and a silver-plated metal reflective film, wherein the white polyester reflective film is formed by adding inorganic particles such as titanium dioxide and barium sulfate into PET and generating a cavity in the PET during unidirectional or bidirectional stretching to improve the light reflectivity. White polyester reflective films are more widely used due to their advantages in price, weight, and flexibility. However, the material is soft, the surface hardness is poor, and defects such as creases and scratches are easy to occur in the using process. And the lower surface of the light guide plate cannot be well protected against scratches.
Patent application CN103064139A discloses a preparation scheme of an anti-scratch reflective film, which adopts a traditional light diffusion flexible and non-flexible particle matching, but the light diffusion particles may be cracked and fall off during the assembly and transportation process, which may cause scratches on the lower surface of the light guide plate and itself. Therefore, the reflective film in the prior art cannot play a good scratch-resistant protection role on the lower surface of the light guide plate.
Disclosure of Invention
In view of the above, the present invention provides an anti-scratch optical reflective film, a method for preparing the same, a backlight module and a liquid crystal display panel. The scratch-resistant optical reflecting film provided by the invention can effectively improve the scratch-resistant effect on the light guide plate and the scratch-resistant effect of the reflecting film, and simultaneously ensures the reflecting effect of the reflecting film.
The invention provides a scratch-resistant optical reflecting film, which comprises:
a base layer;
the scratch-resistant layer is compounded on one side surface of the substrate layer;
the scratch-resistant layer is a foaming film layer formed by the following raw materials:
preferably, the thickness of the scratch resistant layer is 9 to 22 μm, and the size of air bubbles in the scratch resistant layer is 5 to 19 μm.
Preferably, the thickness of the scratch resistant layer is 15-17 μm, and the size of air bubbles in the scratch resistant layer is 10-15 μm.
Preferably, the resin film forming material is selected from one or more of polyurethane, acrylic resin, epoxy resin and polyatomic alcohol resin; the curing agent is an isocyanate curing agent.
Preferably, the blowing agent is selected from azo compound blowing agents.
Preferably, the azo compound blowing agent is selected from azobisisobutyronitrile and/or azobisisoheptonitrile; the curing agent is hexamethylene diisocyanate and/or toluene diisocyanate.
Preferably, the solvent is:
40-45 wt% of ethyl acetate;
33-36 wt% of butanone;
the auxiliary agent comprises:
0.35wt% -0.45 wt% of leveling agent;
0.2wt% -0.6 wt% of nucleating agent;
0.10wt% -0.15 wt% of antistatic agent;
the nucleating agent is selected from one or more of sorbitol nucleating agents;
the substrate layer is a white polyester substrate layer; the base layer contains titanium dioxide and barium sulfate particles.
The invention also provides a preparation method of the scratch-resistant optical reflecting film in the technical scheme, which comprises the following steps:
s1, mixing a resin film-forming material, a curing agent, a foaming agent, an auxiliary agent and a solvent to obtain a coating liquid;
and S2, coating the coating liquid on one surface of the base material, heating, foaming and curing to obtain the scratch-resistant optical reflecting film.
The invention also provides a backlight module, wherein the reflecting film is the scratch-resistant optical reflecting film in the technical scheme.
The invention also provides a liquid crystal display panel, wherein the backlight module is the backlight module in the technical scheme.
The scratch-resistant optical reflecting film is characterized in that a scratch-resistant layer is compounded on the surface of a substrate layer, the scratch-resistant layer is formed by foaming and curing raw materials consisting of a resin film forming matter, a curing agent, a foaming agent, an auxiliary agent and a proper solvent according to a certain proportion, a certain size and a certain amount of air bubbles are arranged in the formed film layer, and the scratch-resistant layer is controlled to be a certain thickness.
The experimental result shows that the anti-scratch optical reflecting film provided by the invention enables the abrasion level of the light guide plate to reach more than 1 grade, the abrasion level of the reflecting film per se also reaches more than 1 grade, and the anti-scratch optical reflecting film shows excellent anti-scratch effect; meanwhile, the total light reflectivity reaches more than 94.2 percent, and the excellent reflection effect is shown.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of a first scratch resistant reflective film provided in the present invention;
fig. 2 is a schematic structural diagram of a first backlight module according to the present invention;
FIG. 3 is a schematic view of a second scratch resistant reflective film according to the present invention;
fig. 4 is a schematic structural diagram of a second backlight module provided in the present invention.
Detailed Description
The invention provides a scratch-resistant optical reflecting film, which comprises:
a base layer;
the scratch-resistant layer is compounded on one side surface of the substrate layer;
the scratch-resistant layer is a foaming film layer formed by the following raw materials:
the scratch-resistant optical reflecting film is characterized in that a scratch-resistant layer is compounded on the surface of a substrate layer, the scratch-resistant layer is formed by foaming and curing raw materials consisting of a resin film forming matter, a curing agent, a foaming agent, an auxiliary agent and a proper solvent according to a certain proportion, a certain amount of air bubbles are contained in the formed film layer, and the scratch-resistant layer is controlled to be of a certain thickness.
In the scratch-resistant optical reflecting film provided by the invention, the scratch-resistant layer is compounded on one side surface of the substrate layer. Referring to fig. 1, fig. 1 is a schematic structural view of a first scratch-resistant reflective film provided in the present invention; wherein, 1 is a substrate layer, 2 is a scratch resistant layer, 3 is air bubbles in the scratch resistant layer, 4 is a film forming material in the scratch resistant layer, and 5 is an auxiliary agent in the scratch resistant layer.
In the invention, when the backlight module is assembled, the scratch-resistant layer in the reflective film is in direct contact with the light guide plate. Referring to fig. 2, fig. 2 is a schematic structural diagram of a first backlight module provided in the present invention, in which 1 is a reflective film, 1a is a substrate layer, 1b is a scratch-resistant layer, 2 is a light guide plate, and 3 is an optical film.
In the scratch-resistant optical reflecting film provided by the invention, scratch-resistant layers can be compounded on both sides of the substrate layer. Referring to fig. 3, fig. 3 is a schematic structural view of a second scratch resistant reflective film provided by the present invention; the anti-scratch coating comprises a base layer 1, an upper anti-scratch layer 2, a lower anti-scratch layer 3, air bubbles in the anti-scratch layer 4, a film forming material in the anti-scratch layer 5 and an auxiliary agent in the anti-scratch layer 6.
When the scratch-resistant layers are compounded on the two sides of the base layer, the upper scratch-resistant layer and the lower scratch-resistant layer are respectively positioned on the upper surface and the lower surface of the base layer. Before the backlight module is assembled, the upper surface and the lower surface are not limited in special direction only for the reflective film product, the surfaces on both sides can be the upper surface or the lower surface (correspondingly, the scratch-resistant layers on both sides can be the upper scratch-resistant layer or the lower scratch-resistant layer), one of the surfaces is the upper surface, and the other surface is the lower surface naturally; when the backlight module is assembled, the surface which is contacted with the light guide plate in the backlight module is marked as an upper scratch-resistant layer, and the surface which is back to the back of the light guide plate is marked as a lower scratch-resistant layer. Referring to fig. 4, fig. 4 is a schematic structural diagram of a second backlight module provided by the present invention, in which 1 is a reflective film, 1a is a substrate layer, 1b is an upper scratch resistant layer, 1c is a lower scratch resistant layer, 2 is a light guide plate, and 3 is an optical film.
In the invention, each layer of the scratch-resistant reflective film is specifically as follows:
in the present invention, the substrate layer is preferably a white polyester substrate layer, more preferably a white polyethylene terephthalate substrate layer, and the substrate layer contains titanium dioxide and barium sulfate. The above-mentioned base layer is referred to as a white reflective film in the industry, and the source of the white polyester base layer is not particularly limited in the present invention, and may be a general commercially available product. In the present invention, the thickness of the base layer is preferably 50 to 300 μm.
In the invention, the scratch-resistant layer is a foaming film layer formed by foaming and curing a coating liquid, and the coating liquid comprises the following components:
in the invention, the resin film forming material is preferably one or more of polyurethane, acrylic resin, epoxy resin and poly-polyol resin. The dosage of the resin film forming material is 16.8-17.8 wt%; in some embodiments of the invention, the resin film former is used in an amount of 16.8wt% or 17.3wt%.
In the present invention, the curing agent is preferably an isocyanate curing agent. The isocyanate curing agent is preferably hexamethylene diisocyanate (i.e., HDI) and/or toluene diisocyanate (i.e., TDI). In the invention, the amount of the resin film forming material is 16.8-17.8 wt% as a reference, and the amount of the curing agent is 2.9-3.5 wt%; in some embodiments of the invention, the curing agent is used in an amount of 2.9wt% or 3.2wt%.
In the present invention, the blowing agent is preferably an azo compound blowing agent; the azo foaming agent can be better matched with the resin film forming material, so that the air bubbles reach the ideal size. In the present invention, the azo compound blowing agent is preferably azobisisobutyronitrile and/or azobisisoheptonitrile. In the invention, the amount of the foaming agent is 0.6-1.4 wt%, more preferably 1.2-1.4 wt% based on the amount of the resin film forming material of 16.8-17.8 wt%; the scratch resistant effect can be effectively realized only by controlling the proportion; wherein, the dosage is controlled to be between 0.6 and 1.4 weight percent, and the size of the air bubbles in the scratch-resistant layer can reach 5 to 19 mu m by matching with other components of the system, so that the abrasion grade of the light guide plate reaches 1 grade; the dosage is controlled to be 1.2 to 1.4 weight percent, the size of air bubbles in the scratch-resistant layer can reach 10 to 15 mu m, and the abrasion level of the light guide plate is further improved to 0 level; if the amount of the blowing agent is too low or too high, the size of the air bubbles is too small or too large, and the scratch resistance effect is lowered. Wherein, the size of the air bubble refers to the diameter of the air bubble. In some embodiments of the invention, the blowing agent is used in an amount of 0.6wt%, 0.8wt%, 1.0wt%, 1.2wt%, or 1.4wt%.
In the present invention, the auxiliary preferably includes:
0.35wt% -0.45 wt% of leveling agent;
0.2wt% -0.6 wt% of nucleating agent;
0.10wt% -0.15 wt% of antistatic agent.
Wherein:
the leveling agent is preferably a BYK leveling agent, more preferably BYK378 and/or BYK388. In the invention, the usage amount of the resin film forming material is 16.8-17.8 wt% as a reference, and the usage amount of the flatting agent is 0.35-0.45 wt%; in some embodiments of the invention, the leveling agent is used in an amount of 0.40wt%.
The nucleating agent is preferably one or more of sorbitol nucleating agents, and is more preferably Millad3988 in Milliken nucleating agent in the United states. A nucleating agent is introduced to form a bubble center during foaming to aid in bubble formation. In the invention, the amount of the nucleating agent is 0.2-0.6 wt%, preferably 0.3-0.6 wt% based on 16.8-17.8 wt% of the resin film forming material; within the preferred range of 0.3wt% -0.6 wt%, the foaming agent dosage is 0.6wt% -1.4 wt%, and the resin film forming material and the curing agent are matched, so that the size and the quantity of air bubbles can be well controlled and balanced, and the abrasion grade of the light guide plate reaches level 1. In some embodiments of the invention, the nucleating agent is used in an amount of 0.20wt%, 0.30wt%, 0.40wt%, 0.50wt%, 0.60wt%.
The antistatic agent is preferably a BYK antistatic agent, more preferably BYK-ES80. In the invention, the dosage of the antistatic agent is 0.10-0.15 wt% based on 16.8-17.8 wt% of the resin film forming material; in some embodiments of the invention, the antistatic agent is used in an amount of 0.10wt%.
In the invention, the total dosage of the auxiliary agent is 0.65-1.20 wt%; in some embodiments of the invention, the total amount of adjuvant is 0.90wt%, 1.00wt%, 1.10wt%.
In the invention, besides the above-mentioned auxiliary agents, other auxiliary agents can be added, including one or more of photoinitiator, photopolymerization accelerator, slipping agent and antioxidant. The kind and amount of the other additives are not particularly limited, and the additives can bring corresponding functions or functions.
In the present invention, the solvent is preferably:
40-45 wt% of ethyl acetate;
33 to 36 weight percent of butanone.
The invention adopts the two solvents to match according to a certain proportion, can better dissolve the foaming agent, enables the resin glue and the curing agent to be better compatible, is beneficial to obtaining fully-dissolved and uniform coating liquid, and achieves better polymerization, foaming and curing effects.
In the invention, the dosage of the resin film forming material is 16.8-17.8 wt% as a reference, and the dosage of the ethyl acetate is 40-45 wt%; in some embodiments of the invention, ethyl acetate is used in an amount of 40.8wt%, 41.0wt%, 41.8wt%, 41.9wt%, 43.2wt%, 43.7wt%, or 44.6wt%. The consumption of the butanone is 33wt% -36 wt%; in some embodiments of the invention, the butanone is used in an amount of 33.2, 33.8, 34.1, 34.6, 35.4, 35.7, 36.0, or 36.3wt%.
The total amount of solvent used in the present invention is the balance, specifically 73wt% to 81wt%, and in some embodiments of the present invention, the total amount of solvent is 76.8wt%, 77.5wt%, 77.6wt%, 77.8wt%, 78.0wt%, or 78.1wt%.
In the invention, the components are uniformly mixed according to a proportion to form a coating liquid, and the coating liquid is coated on one side surface of a base material, heated, foamed and cured to form a foamed film layer. In the present invention, the specification of the scratch resistant layer is preferably: the thickness is 9 to 22 μm, and the size of the air bubbles is 5 to 19 μm; under the control of the specification, the reflective film can enable the abrasion level of the light guide plate to reach 1 level. More preferably, the specification of the scratch resistant layer is: the thickness is 15-17 μm, and the size of the air bubble is 10-15 μm; under the control of the specification, the reflective film can further increase the abrasion level of the light guide plate to 0 level. If the thickness of the scratch resistant layer is too low or too high, and the bubbles are too small or too large, the scratch resistance is lowered. In some embodiments of the invention, the scratch resistant layer has a thickness of 9 μm, 12 μm, 13 μm, 15 μm, 16 μm, 17 μm, or 22 μm; the size of the bubbles in the scratch resistant layer is 5-7 μm, 8-10 μm, 9-12 μm, 10-12 μm, 12-15 μm, 16-19 μm, 11-14 μm, 12-14 μm, 11-15 μm and 12-15 μm.
According to the scheme of compounding the scratch-resistant layers on both sides of the substrate, the upper scratch-resistant layer and the lower scratch-resistant layer are foamed film layers formed by foaming and curing coating liquids, and the coating liquids of the two scratch-resistant layers are respectively and independently selected from the coating liquids. The coating liquid formulation is the same as that described above and will not be described in detail here.
In the invention, after coating the coating liquid on two sides of the substrate respectively, heating, foaming and curing are carried out to form foaming film layers, namely an upper scratch-resistant layer and a lower scratch-resistant layer. In the present invention, preferably, the specifications of the upper scratch resistant layer and the lower scratch resistant layer are independently selected from: the thickness is 9 to 22 μm, and the size of the air bubbles is 5 to 19 μm; under the control of the specification, the reflective film can enable the abrasion level of the light guide plate to reach 1 level. More preferably, the specifications of the upper scratch resistant layer and the lower scratch resistant layer are independently selected from: the thickness is 15-17 μm, and the size of the air bubbles is 10-15 μm; under the control of the specification, the abrasion grade of the light guide plate can be further improved to 0 grade by the reflection film. If the thickness of the scratch resistant layer is too low or too high, and the bubbles are too small or too large, the scratch resistance is lowered. In some embodiments of the invention, the thickness of the overlying scratch resistant layer is 9 μm, 12 μm, 13 μm, 15 μm, 16 μm, 17 μm, or 22 μm; the size of the bubbles in the upper scratch-resistant layer is 5-7 μm, 8-10 μm, 9-12 μm, 10-12 μm, 12-15 μm, 16-19 μm, 11-14 μm, 12-14 μm, 11-15 μm and 12-15 μm. In some embodiments of the invention, the underlying scratch resistant layer has a thickness of 9 μm, 11 μm, 12 μm, 15 μm, 16 μm, 17 μm, 18 μm, or 20 μm; the size of the air bubbles in the underlying scratch-resistant layer is 5-7 μm, 8-10 μm, 9-12 μm, 10-12 μm, 12-15 μm, 16-19 μm, 11-14 μm, 12-14 μm, 11-15 μm and 12-15 μm.
The invention also provides a preparation method of the scratch-resistant optical reflecting film in the technical scheme, which comprises the following steps:
s1, mixing a resin film-forming material, a curing agent, a foaming agent, an auxiliary agent and a solvent to obtain a coating liquid;
and S2, coating the coating liquid on one surface of the base material, heating, foaming and curing to obtain the scratch-resistant optical reflecting film.
The types and the amounts of the resin film forming material, the curing agent, the foaming agent, the auxiliary agent and the solvent are consistent with those in the technical scheme, and are not described in detail herein.
With respect to step S1: the mixing manner is not particularly limited, and the components can be mixed uniformly.
With respect to step S2: the manner of coating is not particularly limited, and may be a coating operation that is conventional in the art, such as a bar coating method, a gravure coating method, a blade coating method, or a spray coating method. The heating temperature is preferably 85-95 ℃; the heating time is preferably 3-5 min; by combining the raw material formula with the heating condition, the size and the number of bubbles in the scratch-resistant layer can be effectively controlled, and the foamed film layer is ensured to be complete and undamaged, so that the scratch-resistant effect is effectively improved. In the heating process, the resin film-forming material and the curing agent are subjected to a crosslinking polymerization reaction, and meanwhile, the azo foaming agent is decomposed to generate gases such as nitrogen and the like to form bubbles, so that a foamed and cured film layer is obtained.
The invention also provides a backlight module, wherein the reflecting film is the scratch-resistant reflecting film in the technical scheme. Wherein, the scratch-resistant layer in the reflecting film is in direct contact with the light guide plate. Referring to fig. 2, fig. 2 is a schematic structural diagram of a first backlight module provided in the present invention, in which 1 is a reflective film, 1a is a substrate layer, 1b is a scratch-resistant layer, 2 is a light guide plate, and 3 is an optical film. Referring to fig. 4, fig. 4 is a schematic structural diagram of a second backlight module provided by the present invention, in which 1 is a reflective film, 1a is a substrate layer, 1b is an upper scratch resistant layer, 1c is a lower scratch resistant layer, 2 is a light guide plate, and 3 is an optical film.
The invention also provides a liquid crystal display panel, wherein the backlight module is the backlight module in the technical scheme.
The scratch-resistant optical reflecting film is characterized in that a scratch-resistant layer is compounded on the surface of a substrate layer, the scratch-resistant layer is formed by foaming and curing raw materials consisting of a resin film forming matter, a curing agent, a foaming agent, an auxiliary agent and a proper solvent according to a certain proportion, a certain amount of air bubbles are contained in the formed film layer, and the scratch-resistant layer is controlled to be of a certain thickness.
The experimental result shows that the anti-scratch optical reflecting film provided by the invention enables the abrasion level of the light guide plate to reach more than 1 grade, the abrasion level of the reflecting film per se also reaches more than 1 grade, and the anti-scratch optical reflecting film shows excellent anti-scratch effect; meanwhile, the total light reflectivity reaches more than 94.2 percent, and the excellent reflection effect is shown.
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
In the following examples, base white polyester PET was purchased from south Asia Plastic industry, inc., taiwan. The coating liquid was prepared from commercially available raw materials.
Example 1
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 85 ℃ and the time is 3min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 9 μm.
Example 2
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 85 ℃ and the time is 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 12 μm.
Example 3
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 90 ℃ and the time is 3min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 12 μm.
Example 4
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 micrometers, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing at 90 ℃ for 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 14 μm.
Example 5
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 95 ℃ and the time is 3min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 17 μm.
Example 6
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 micrometers, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 95 ℃ and the time is 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 16 μm.
Example 7
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 95 ℃ and the time is 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 17 μm.
Example 8
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 95 ℃ and the time is 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 16 μm.
Example 9
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 95 ℃ and the time is 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 17 μm.
Example 10
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 micrometers, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 95 ℃ and the time is 5min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 20 μm.
Comparative example 1
HY21 white polyester reflective film produced in south Asia of Taiwan has thickness of 50 μm.
Comparative example 2
UX188 white polyester reflective film manufactured by Kitikon K.K., having a thickness of 188. Mu.m.
Comparative example 3
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 micrometers, coating the coating liquid on the upper surface of the white polyester PET, heating and curing at 90 ℃ for 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 8 μm.
Comparative example 4
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating and curing at the temperature of 95 ℃ for 3min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 17 μm.
Comparative example 5
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating and curing at the temperature of 90 ℃ for 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 26 μm.
Comparative example 6
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating and curing at the temperature of 85 ℃ for 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 17 μm.
Comparative example 7
1. Coating liquid raw material formula
Performed as in example 1, except that only the blowing agent was replaced with light diffusing particles as follows:
2. preparation of a reflecting film: the same as in example 1.
S1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating and curing at the temperature of 85 ℃ for 3min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 9 μm.
Example 11
The scratch resistant reflective films of examples 1 to 10 and comparative examples 1 to 7 were subjected to performance tests, and the results are shown in table 1.
Observation of bubble size: 10 samples are prepared for each sample to be detected, and the size of bubbles on the scratch-resistant layer is observed by using a laser confocal 3D microscope.
Testing of scratch resistance: preparing 10 samples for each sample to be tested, selecting a PC light guide plate (the thickness is 430 μm), superposing a reflecting film and the light guide plate, wherein the upper scratch-resistant layer of the reflecting film is in direct contact with the light guide plate, and then testing the friction effect between the upper scratch-resistant layer of the reflecting film and the lower surface (lattice point surface) of the light guide plate (the surface in the light guide plate, which is in contact with the reflecting film, is taken as a test object) and the friction effect of the reflecting film per se (the self friction effect refers to the friction effect of the surface in the reflecting film, which is in contact with the PC light guide plate, namely the upper scratch-resistant layer) under an abrasion-resistant testing machine. The abrasion test described above is referred to standard GB/T3960-2016.
The detection of the wear resistance is mainly the detection of the appearance of the light guide plate after the test, and the detection is divided into the following steps according to the wear degree of the light guide plate: grade 0 (no wear), grade 1 (light wear, but not usage), grade 2 (medium wear, usage impact), grade 3 (heavy wear, non-usage).
And (3) testing the total light reflectivity: reference is made to standard astm d1003.
TABLE 1 results of measuring the properties of the scratch resistant reflective films obtained in examples 1 to 10 and comparative examples 1 to 7
From the test results of table 1, it can be seen from comparative examples 1 to 7 that the white polyester PET without the scratch resistant layer and the white polyester PET reflective film coated with the light diffusion particles were more severely damaged to the lower surface of the PC light guide plate in abrasion. Compared with comparative examples 1 to 7, the scratch resistance effect of examples 1 to 10 of the present invention is significantly improved, and the good reflectance is maintained. It can be seen from examples 1 to 10 that, as the bubbles in the scratch resistant layer gradually increase and the thickness of the scratch resistant layer increases, the degree of abrasion to the PC flexible light guide plate and the reflective film itself decreases and then increases, and when the thickness of the scratch resistant layer is 9 to 22 μm and the size of the bubbles is 5 to 19 μm, the abrasion level of the reflective film can reach level 1, and the total light reflectance is above 94.2%; when the specifications are preferred, that is, the thickness of the scratch resistant layer is 15 to 17 μm and the bubble size is 10 to 15 μm, the abrasion level of the reflective film can be further improved to 1, and the total light reflectance can be 94.3% or more.
Comparative example 8
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 micrometers, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 85 ℃, the heating time is 3min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 7 μm.
Comparative example 9
1. Coating liquid raw material formula
2. Preparation of a reflecting film:
s1, uniformly mixing the raw materials at room temperature to obtain a coating liquid.
S2, taking white polyester PET with the thickness of 50 microns, coating the coating liquid on the upper surface of the white polyester PET, heating, foaming and curing, wherein the heating temperature is 95 ℃ and the time is 4min, and forming an upper scratch-resistant layer on the substrate to obtain the scratch-resistant reflecting film. Wherein the thickness of the upper scratch resistant layer is 26 μm.
Example 12
The properties of the reflective films obtained in comparative examples 8 to 9 were measured with reference to example 11 and compared with those of examples 1 to 10, and the results are shown in Table 2.
TABLE 2 Performance test results of the anti-scratch reflective films obtained in comparative examples 8 to 9
As can be seen from the test results in Table 2, the scratch resistant effects of the comparative examples 8 to 9 become poor, and it is proved that if the thickness of the scratch resistant layer is too small or too large and the size of the bubbles is too small or too large, the scratch resistant effect of the reflective film is reduced to below level 2. When the thickness of the scratch-resistant layer is controlled to be 9-22 mu m and the size of the bubbles is controlled to be 5-19 mu m, the scratch-resistant effect can be improved, the abrasion grade of the reflecting film can reach more than 1 grade, and the total light reflectivity is more than 94.2 percent.
Comparative example 10
1. The coating liquid comprises the following raw materials: the same as in example 1.
2. Preparation of a reflecting film:
s1, according to example 1, the raw materials were uniformly mixed at room temperature to obtain a coating liquid.
S2, the procedure of example 1 was followed, except that the foaming conditions were as follows: heating at 75 deg.C for 10min; the thickness of the top scratch resistant layer in the obtained reflective film was 11 μm.
Comparative example 11
1. The coating liquid comprises the following raw materials in percentage by weight: the same as in example 1.
2. Preparation of a reflecting film:
s1, according to example 1, the raw materials were uniformly mixed at room temperature to obtain a coating liquid.
S2, the procedure is as in example 1, except that the foaming conditions are as follows: heating at 100 deg.C for 2min; the thickness of the top scratch resistant layer in the obtained reflective film was 11 μm.
Example 13
The reflection films obtained in comparative examples 10 to 11 were examined with reference to example 11, and the results showed that: comparative examples 10 to 11 all exhibited bubble collapse and coating breakage, and scratch resistance could not be effectively achieved; it is proved that if the foaming curing temperature and time are too low or too high, the preparation and performance of the emitting film are affected. The foaming condition is controlled to be 85-95 ℃ and the time is 3-5 min, the scratch resistance effect can be improved, the abrasion level of the reflecting film reaches 1 level, and the total light reflectivity is more than 94.2%.
The foregoing examples are provided to facilitate an understanding of the principles of the invention and their core concepts, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that approximate the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (5)
1. A scratch resistant optical reflective film, comprising:
a base layer;
the scratch-resistant layer is compounded on one side surface of the substrate layer;
the scratch-resistant layer is a foaming film layer formed by the following raw materials:
16.8-17.8 wt% of resin film forming material;
2.9-3.5 wt% of curing agent;
1.2-1.4 wt% of foaming agent;
0.35wt% to 0.45wt% of a leveling agent;
0.3wt% -0.6 wt% of nucleating agent;
0.10wt% -0.15 wt% of antistatic agent;
40-45 wt% of ethyl acetate;
33-36 wt% of butanone;
the nucleating agent is selected from one or more of sorbitol nucleating agents;
the thickness of the scratch-resistant layer is 15 to 17 mu m, and the size of air bubbles in the scratch-resistant layer is 10 to 15 mu m;
the resin film forming material is selected from one or more of polyurethane, acrylic resin, epoxy resin and poly-polyol resin;
the curing agent is hexamethylene diisocyanate and/or toluene diisocyanate;
the foaming agent is selected from azo compound foaming agents; the azo compound foaming agent is selected from azobisisobutyronitrile and/or azobisisoheptonitrile;
the scratch-resistant optical reflection film is prepared by the following preparation method:
s1, mixing a resin film forming material, a curing agent, a foaming agent, a leveling agent, a nucleating agent, an antistatic agent, ethyl acetate and butanone to obtain a coating liquid;
s2, coating the coating liquid on one surface of a base material, heating, foaming and curing to obtain the scratch-resistant optical reflecting film;
the heating temperature is 85 to 95 ℃; the heating time is 3 to 5min.
2. The scratch resistant optical film of claim 1 wherein the substrate layer is a white polyester substrate layer; the white polyester substrate layer contains titanium dioxide and barium sulfate particles.
3. The preparation method of the scratch-resistant optical reflection film as claimed in any one of claims 1 to 2, which is characterized by comprising the following steps:
s1, mixing a resin film forming material, a curing agent, a foaming agent, a leveling agent, a nucleating agent, an antistatic agent, ethyl acetate and butanone to obtain a coating liquid;
s2, coating the coating liquid on one surface of a base material, heating, foaming and curing to obtain the scratch-resistant optical reflecting film;
the heating temperature is 85 to 95 ℃; the heating time is 3 to 5min.
4. A backlight module, wherein the reflective film is the scratch-resistant optical reflective film according to any one of claims 1 to 2.
5. A liquid crystal display panel, wherein the backlight module is the backlight module of claim 4.
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| TW200827763A (en) * | 2006-12-25 | 2008-07-01 | Eternal Chemical Co Ltd | Scratch-resistant optical film |
| CN108196327B (en) * | 2017-12-04 | 2020-07-21 | 宁波激智科技股份有限公司 | Scratch-resistant optical diffusion film and preparation method thereof |
| CN109655948A (en) * | 2018-12-24 | 2019-04-19 | 宁波激智科技股份有限公司 | A kind of scratch resistance optics bubble diffusion barrier and preparation method thereof |
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| JP2006227162A (en) * | 2005-02-16 | 2006-08-31 | Konica Minolta Opto Inc | Antireflection film, method of manufacturing antireflection film, polarizing plate, and display device |
| JP2009186651A (en) * | 2008-02-05 | 2009-08-20 | Konica Minolta Opto Inc | Method for manufacturing antireflection film, antireflection film, polarizing plate, and image display device |
| CN202075434U (en) * | 2011-05-11 | 2011-12-14 | 武汉金牛经济发展有限公司 | Reflective film with high damage-resistant performance, high stiffness and high processing property |
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