CN106908863B - Optical reflecting film and preparation method thereof - Google Patents
Optical reflecting film and preparation method thereof Download PDFInfo
- Publication number
- CN106908863B CN106908863B CN201610222040.XA CN201610222040A CN106908863B CN 106908863 B CN106908863 B CN 106908863B CN 201610222040 A CN201610222040 A CN 201610222040A CN 106908863 B CN106908863 B CN 106908863B
- Authority
- CN
- China
- Prior art keywords
- layer
- particles
- reflective film
- film
- backlight module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0808—Mirrors having a single reflecting layer
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the field of reflecting films, in particular to an optical reflecting film suitable for a short OD backlight module and a preparation method thereof. The invention provides an optical reflecting film and a preparation method thereof, aiming at solving the problem that the existing reflecting film is poor in light uniformity when applied to a short OD backlight module. The reflective film includes a main layer (layer B) and an auxiliary layer (layer A) disposed on the main layer; the auxiliary layer (layer A) comprises the following components: polyester resin 86.5-93%, SiO with small grain size20.1-5% of particles, 0.5-2% of inorganic particles with large particle size and 5-10% of antistatic agent, wherein the percentage is mass percentage; the small-particle-diameter SiO2The average particle diameter of the inorganic particles of (2) to (4) μm, and the average particle diameter of the inorganic particles of large particle diameter is from 5 to 15 μm. After the reflecting film is applied to the short OD backlight module, the light uniformizing effect in the backlight module can be effectively improved, and the phenomena of light particles and shadows can not be generated.
Description
Technical Field
The invention relates to the field of reflecting films, in particular to an optical reflecting film suitable for a short OD backlight module and a preparation method thereof.
Background
The flat panel display technology mainly includes various technical types of television products such as Liquid Crystal Display (LCD), Plasma Display (PDP), digital light display rear projection television (DLP), reflective projection display (LCOS), organic electroluminescent display (OLED), surface conduction electron emission display (SED), and the like, wherein Liquid Crystal Display (LCD) will become the mainstream technology of flat panel display for a long time in the future due to a series of advantages such as thin plane, light weight, low power consumption, low voltage operation, no radiation, and the like. The LED backlight module is divided into a side-in type and a direct type according to the position of a light source. The side-in backlight module has the advantages of thin module thickness due to the fact that the light source is arranged on the side edge; and the direct type backlight module is arranged below the light source.
In the backlight module, the reflecting film can reflect the leaked light, so that the utilization rate of the light is improved. The side-in type backlight module has the advantage of thickness, but the light guide plate with the light guide function is tightly attached to the reflective film, which may cause undesirable phenomena such as dark shadow due to adsorption, and the coated reflective film may also cause problems such as scratch and white top, and thus, the technology is not easy to implement compared with the direct type backlight. In the direct type backlight, a light source is arranged below, and a uniform picture is formed more easily. With the development of the market, the overall thickness of the direct-type backlight module is reduced, i.e. the distance between the light source and the diffuser plate, which is generally called as the od (optical distance) distance, is reduced. For example, the conventional direct type backlight module has an OD distance of 20-30mm, while the current market of short OD backlight modules has an OD distance of 15-18mm, or even 12mm direct type backlight modules. After the traditional reflecting film is used for the short OD backlight module, the phenomena of lamp particles and dark surrounding are easy to appear, and even if two diffusion films are covered for light evening, a uniform picture is difficult to form. This non-uniform picture phenomenon is not allowed to occur in the backlight.
As a countermeasure for solving the non-uniformity in the short OD backlight module, there is a method of coating diffusion particles on the surface of the reflective film, but such coating increases the number of process steps of the reflective film, and is time-consuming and labor-consuming.
Disclosure of Invention
The invention provides an optical reflecting film and a preparation method thereof, aiming at solving the problem that the existing reflecting film is poor in light uniformity when applied to a short OD backlight module. The reflective film has excellent diffuse reflection effect, can effectively improve the light-homogenizing effect of the reflective film in the backlight module after being applied to the short OD backlight module, has good light-homogenizing performance, and can not generate the phenomena of light particle shadows and four-corner shadows. The invention adds inorganic filler particles with two particle sizes into the layer A of the reflecting film to obtain the reflecting film with the surface of the layer A containing large and small particle protrusions coated by polyester. The reflecting film provided by the invention is formed in one step, and the preparation method is simple in process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the present invention provides a reflective film comprising a main layer (layer B) and an auxiliary layer (layer a) provided on the main layer;
the main layer comprises the following components: 72-82% of polyester resin, 10-13% of incompatible resin and 8-15% of white inorganic filling particles; the average particle diameter of the white inorganic filler particles is 0.1-0.4 μm; the percentage is mass percentage;
the auxiliary layer (layer A) comprises the following components: polyester resin 86.5-93%, SiO with small grain size20.1-5% of particles, 0.5-2% of inorganic particles with large particle size and 5-10% of antistatic agent, wherein the percentage is mass percentage; the small-particle-diameter SiO2The average particle diameter of the particles is 2-4 μm, and the average particle diameter of the inorganic particles with large particle diameter is 5-15 μm.
Further, the white inorganic filler particles have an average particle diameter of 0.2 to 0.4. mu.m.
The 60-degree surface glossiness of the reflecting film is 10-20%. Further, the 60 DEG surface gloss of the reflective film is 10 to 17%. The reflecting film is suitable for a short OD backlight module.
Further, the reflective film includes an ABA three-layer structure or an AB two-layer structure.
Further, the reflecting film is of an ABA three-layer structure or an AB two-layer structure.
Further, the reflecting film structure is an ABA three-layer structure, wherein the thickness of one A layer accounts for 4-10% of the total thickness of the reflecting film, and the thickness of the B layer accounts for 80-92% of the total thickness of the reflecting film. Further, the thickness of one A layer accounts for 4.7-5.8% of the total thickness of the reflecting film.
Further, the total thickness of the reflecting film is 100-300 μm. Further, the total thickness of the reflecting film is 188-.
The main layer (layer B) has micropores therein. The auxiliary layer (layer A) does not contain a cellular structure. Incompatible resins are pore-forming substances that are capable of forming pores within the primary layer.
The main function of the layer B is to reflect light, and the function of the layer A is to form a low-gloss surface through a high-low convex structure, so that an excellent diffuse reflection effect is realized.
The polyester resin is one selected from polyesters formed from a dicarboxylic acid component and a diol component. Further, dicarboxylic acid components such as terephthalic acid, isophthalic acid, 2, 6-naphthalenedicarboxylic acid, 4' -biphenyldicarboxylic acid, adipic acid and sebacic acid are exemplified. Examples of the diol component include ethylene glycol, 1, 4-butanediol, 1, 4-cyclohexanedimethanol, and 1, 6-hexanediol. Further, the polyester resin is preferably an aromatic polyester.
Further, the polyester resin is preferably polyethylene terephthalate (PET), polybutylene terephthalate (PBT), or polyethylene naphthalate (PEN).
In the main layer, the white inorganic filler particles are selected from titanium dioxide. Furthermore, the particle size of the titanium dioxide filling particles is preferably 0.2-0.4 μm. The inorganic particles having an average particle diameter in this range can be appropriately dispersed in the polyester without causing aggregation of the particles, and the inorganic particles may have any shape, for example, the inorganic particles may have a plate shape or a spherical shape. The inorganic particles may be surface-treated to improve the dispersibility of the inorganic particles.
The incompatible resin means a resin incompatible with the polyester resin. The incompatible resin is selected from one of polyolefin resins, such as polypropylene resin (abbreviated as polypropylene), or one of poly-4-methylpentene. During the stretching process of the incompatible resin and the polyester resin at a high stretching ratio, a cellular structure is formed in the main layer structure, and light rays can be refracted through the interface of the pores, so that the white reflecting film with excellent reflectivity is obtained.
Furthermore, the micropores in the B layer are in an ellipsoid shape, the major diameter of the cells is 0.1-1 μm, and the density of the cells is 10000-3。
Further, the auxiliary layer contains 0.1-5% of SiO2If SiO2When the amount is too large, it is difficult to form a reflective film. Further, SiO2The content of (b) is preferably 2%.
In the auxiliary layer, the inorganic particles with large particle size are selected from one of calcium oxide, barium sulfate or talcum powder. Further, the inorganic particles having a large particle size are preferably talc.
Further, the talc powder preferably has an average particle diameter of 6.5 to 10 μm. If the particle size of the talc powder is too large, the film forming property of the reflective film is difficult, and if the particle size is too small, a proper protrusion cannot be formed, and a good diffuse reflection effect cannot be achieved. Furthermore, the talcum powder is modified. The surface modifier is used for modifying the surface of the talcum powder, so that the dispersibility and the affinity of the talcum powder in a high polymer matrix are improved.
Further, in the A layer of the reflective film, SiO of small particle size2The particles and the inorganic particles having a large particle diameter form convex particles on the surface of the layer A of the reflective film.
Furthermore, the height of the convex particles on the surface of the A layer of the reflecting film is 2-10 μm.
Further, in the reflective film, the auxiliary layer (layer a) includes the following components: polyester resin 86.5-90%, SiO with small grain size20.1-5% of particles, 0.5-2% of inorganic particles with large particle size and 6-8% of antistatic agent, wherein the percentage is mass percentage; the small-particle-diameter SiO2The average particle diameter of the inorganic particles of (2) to (4) μm, and the average particle diameter of the inorganic particles of large particle diameter is from 6.5 to 10 μm. The foregoing numerical ranges correspond to the numerical values in examples 1 to 12.
Further, in the reflective film, the main layer comprises the following components: 72-80% of polyester resin, 10-13% of incompatible resin and 10-15% of white inorganic filling particles; the average particle diameter of the white inorganic filler particles is 0.2-0.4 μm; the percentage is mass percentage;
the auxiliary layer (layer A) comprises the following components: polyester resin 86.5-90%, SiO with small grain size20.1-5% of particles, 0.5-2% of inorganic particles with large particle size and 6-8% of antistatic agent, wherein the percentage is mass percentage; the small-particle-diameter SiO2The average particle diameter of the inorganic particles of (2) to (4) μm, and the average particle diameter of the inorganic particles of large particle diameter is from 6.5 to 10 μm. The foregoing numerical ranges correspond to examples 2-3, 5-6, 8-9, 11-12.
Further, in the reflective film, the main layer comprises the following components: 72% of polyester resin, 13% of incompatible resin and 15% of white inorganic filler particles; the average particle diameter of the white inorganic filler particles is 0.2-0.4 μm; the percentage is mass percentage; the auxiliary layer (layer A) comprises the following components: 89% of polyester resin and SiO with small particle size24 percent of particles, 1 percent of inorganic particles with large particle size and 8 percent of antistatic agentMass percentage content; the small-particle-diameter SiO2The average particle diameter of the particles is 2 to 4 μm, and the average particle diameter of the inorganic particles having a large particle diameter is 6.5 to 10 μm.
Further, in the reflective film, in the main layer, the incompatible resin is a polypropylene resin; the white inorganic filler particles are TiO2。
Further, in the reflective film, the inorganic particles having a large particle size in the auxiliary layer are talc.
Further, in the reflective film, in the auxiliary layer, the antistatic agent is selected from ethoxylated alkylamines.
The antistatic agent can reduce the adsorption problem of hollow waste membranes in direct type membrane cutting.
Further, in the reflective film, the polyester resin is selected from polyethylene terephthalate.
The invention also provides a backlight module, wherein the reflecting film used in the backlight module is the reflecting film; the OD value in the backlight module is 12-18 μm.
The invention also provides a preparation method of the reflecting film, which comprises the following steps:
(1) small particle size SiO for layer A2Mixing particles (silicon-containing master batch), large-particle-size inorganic particles and antistatic agent master batch in advance, adding polyester resin serving as a carrier into a mixing roll, and fully mixing to obtain a raw material mixture;
(2) weighing raw materials of the layer B according to a formula, drying and mixing the raw materials by a mixing device, extruding the raw materials of the layer B by a double-screw extruder, melting and extruding the raw materials of the layer A by a single-screw extruder, carrying out tape casting extrusion on the raw materials of the layer A and the raw materials of the layer B at a die head by using a main layer and an auxiliary layer together, cooling a casting sheet, and carrying out longitudinal stretching, transverse stretching and heat setting treatment to form the reflecting film.
Compared with the existing reflecting film, the optical reflecting film provided by the invention can effectively improve the light uniformity (or called light uniformity) of short OD backlight after being applied to the short OD backlight module, and can effectively reduce the shadow phenomenon. The reflective film provided by the invention is formed in one step, the process is simple, the operation is easy, the subsequent complicated coating process is avoided, and the polyester-coated high-low particle protrusions on the surface of the reflective film A can provide effective diffuse reflection, so that the short OD backlight obtains a good light uniformizing effect. The reflecting film provided by the invention can be widely applied to short OD backlight modules.
Drawings
Fig. 1 is a schematic structural diagram of a reflective film provided by the present invention.
Detailed Description
For a better understanding of the present invention, its structure, and the functional features and advantages attained by its structure, reference is made to the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which:
as shown in fig. 1, the present invention provides a reflective film suitable for a short OD backlight module, the reflective film comprising a reflective film main layer 1 and an auxiliary layer 2 disposed on the main layer; the main layer 1 (which may be referred to as a B layer) contains micropores 11 and inorganic particles 12 therein; the main layer mainly plays a role of reflecting light; the auxiliary layer 2 (which may be referred to as the A layer) comprises SiO with a smaller particle size2Particles 21 and inorganic particles 22 of a larger particle size.
The reflective film suitable for the short OD backlight module provided by the invention is used for detecting various performances by the following method.
1. Thickness of each layer
The thickness of each layer of the reflective film was determined by observing the cross section of the film at a magnification of 500 times using an S-4700 field emission scanning electron microscope prepared by Hitachi, Japan, and measuring the average value of 5 points.
2. Surface glossiness of reflective film
The gloss of the surface of the resultant reflective film was measured using a ZGM 1020 type gloss meter (manufactured by Jienel, Switzerland) and the average value of the 5-point area was recorded as the gloss of the reflective film. The lower the glossiness is, the better the diffuse reflection effect is, and the glossiness of the reflecting film provided by the invention is lower than 20%.
3. Uniformity (or light uniformity, also called "light uniformity") of backlight module (OD ═ 18mm)
Each reflecting film obtained in the embodiment is cut according to the drawing of the backlight module and then placed in the backlight module, after the backlight module is assembled, the backlight is lightened, and whether the backlight module has the phenomena of middle light particles and dark shadows around or not is subjectively observed:
o: the backlight has no light particles and no shadow phenomenon at the periphery, and the light uniformity is best;
and (delta): the shadow phenomenon of the backlight light particles and the periphery is slight, and the light uniformity is good;
x: the backlight is obvious, the shadow around the backlight is heavy, and the light uniformity is poor.
4. Stretchability (or called film-forming property)
The reflective films in the examples were evaluated based on the following criteria, with or without stable film formation during molding. The longitudinal direction is a continuous film forming direction of the film, and the transverse direction is a direction perpendicular thereto.
A, stably preparing the film for more than 2 hours;
b, stably preparing the film for more than 1 hour and less than 2 hours;
if C is less than 1 hour, the film is broken and the film cannot be stably formed.
5. Backlight module (OD 18mm) brightness (also called brilliance)
Each of the reflection films obtained in the examples was cut on the reflection film drawing of the backlight unit, and the light-emitting surface of the backlight unit was divided into 9 regions of 3 × 3, and the front surface luminance after lighting for 1 hour was measured with a fraudon BM-7A luminance meter at a measurement angle of 1 °, and the distance between the luminance meter and the light-emitting surface of the front surface of the backlight unit was 50 cm. The arithmetic mean of the brightnesses of the 9 regions was obtained as a brightness value of the reflective film suitable for a backlight.
The reflective films provided in examples and comparative examples have a structure of an ABA three-layer structure, and the thicknesses of the respective layers are shown in table 2.
Example 1
The invention provides a reflective film, which comprises a reflective film main layer and an auxiliary layer arranged on the main layer. The main layer of the reflecting film comprises 8 mass percent of TiO2，TiO2The average particle diameter of the particles was 0.2 μm; 13 percent of polypropylene resin (produced by Nordic chemical industry (Borealis) and with the product model of WF420HMS) and 79 percent of PET polyester resin (Chinese character of 'Jie')PET film grade slices produced by chemical fiber company Limited, with the trade mark FG 600); the auxiliary layer of the reflective film comprises 1 mass% of SiO with an average particle diameter of 4 μm 21 percent of talcum powder with the average grain diameter of 10 mu m by mass, 8 percent of antistatic agent (plastic antistatic agent provided by Ningbo color master batch Co., Ltd.) and 90 percent of PET polyester resin (PET film grade slice produced by China instrumented chemical fiber Co., Ltd., product brand number FG 600). The raw materials of the auxiliary layer are fully mixed according to the formula to obtain a raw material mixture, the raw materials of the auxiliary layer and the main layer are respectively melted and mixed by a single-screw extruder and a double-screw extruder after being dried and mixed by a mixing device, the main layer and the auxiliary layer are jointly cast and extruded at a die head, a cast sheet is cooled, and the reflective film is formed after longitudinal stretching, transverse stretching and heat setting treatment. The evaluation results are summarized in table 2.
Example 2
The reflective film as in embodiment 1, wherein the TiO in the primary layer2The percentage content of (A) is 10%, and the percentage content of PET is 77%; in the auxiliary layer, the percentage content of the talcum powder is 1.5 percent, and the percentage content of the PET is 89.5 percent. The evaluation results are summarized in table 2.
Example 3
The reflective film as in embodiment 1, wherein the TiO in the primary layer2The percentage content of (A) is 15%, and the percentage content of PET is 72%; SiO in auxiliary layer 22% by weight of PET and 89% by weight of PET. The evaluation results are summarized in table 2.
Example 4
The invention provides a reflective film, which comprises a reflective film main layer and an auxiliary layer arranged on the main layer. The main layer of the reflecting film comprises 8 mass percent of TiO2，TiO2The average particle diameter of the particles was 0.4 μm; 10% by mass of polypropylene resin (produced by northern Europe chemical industry (Borealis) and the product model is WF420HMS), and 82% by mass of PET polyester resin (PET film grade slices produced by China instrumented chemical fiber company Limited and the commodity brand is FG 600); the auxiliary layer of the reflective film comprises 2 mass% of SiO with an average particle diameter of 4 μm21.5% by mass of talc having an average particle diameter of 10 μmPowder and PET polyester resin (PET film grade chips produced by China instrumented chemical fiber company Limited, the trade mark is FG600) with the content of antistatic agent (plastic antistatic agent provided by Ningbo color masterbatch company Limited) of 8 percent and 88.5 percent. The raw materials of the auxiliary layer are fully mixed according to the formula to obtain a raw material mixture, the raw materials of the auxiliary layer and the main layer are respectively melted and mixed by a single-screw extruder and a double-screw extruder after being dried and mixed by a mixing device, the main layer and the auxiliary layer are jointly cast and extruded at a die head, a cast sheet is cooled, and the reflective film is formed after longitudinal stretching, transverse stretching and heat setting treatment. The evaluation results are summarized in table 2.
Example 5
The invention provides a reflective film, which comprises a reflective film main layer and an auxiliary layer arranged on the main layer. The main layer of the reflecting film comprises 10 mass percent of TiO2，TiO2The average particle diameter of the particles was 0.4 μm; 10% by mass of polypropylene resin (produced by northern Europe chemical industry (Borealis) and the product model is WF420HMS), and 80% by mass of PET polyester resin (PET film grade slice produced by China instrumented chemical fiber company Limited and the commodity brand is FG 600); the auxiliary layer of the reflective film comprises 0.1 mass% of SiO with an average particle diameter of 2 μm2The antistatic polyester comprises particles, 2 mass percent of talcum powder with the average particle size of 10 mu m, 8 percent of antistatic agent (plastic antistatic agent provided by Ningbo color masterbatch Co., Ltd.) and 89.9 percent of PET polyester resin (PET film grade chips produced by China characterization chemical fiber Co., Ltd., product mark FG 600). The raw materials of the auxiliary layer are fully mixed according to the formula to obtain a raw material mixture, the raw materials of the auxiliary layer and the main layer are respectively melted and mixed by a single-screw extruder and a double-screw extruder after being dried and mixed by a mixing device, the main layer and the auxiliary layer are jointly cast and extruded at a die head, a cast sheet is cooled, and the reflective film is formed after longitudinal stretching, transverse stretching and heat setting treatment. The evaluation results are summarized in table 2.
Example 6
The invention provides a reflective film, which comprises a main layer and an auxiliary layer arranged on the main layer. The main layer of the reflecting film comprises 15 mass percent of TiO2，TiO2The average particle diameter of the particles was 0.4. mu.m(ii) a 10% by mass of polypropylene resin (produced by northern Europe chemical industry (Borealis) and the product model is WF420HMS), and 75% by mass of PET polyester resin (PET film grade slices produced by China instrumented chemical fiber company Limited and the commodity brand is FG 600); the auxiliary layer of the reflective film comprises 5 mass% of SiO with an average particle diameter of 2 μm2The antistatic coating comprises particles, 0.5% by mass of talcum powder with the average particle size of 10 mu m, 8% by mass of antistatic agent (plastic antistatic agent provided by Ningbo color masterbatch Co., Ltd.) and 86.5% by mass of PET polyester resin (PET film grade chips produced by China characterization chemical fiber Co., Ltd., product number FG 600). The raw materials of the auxiliary layer are fully mixed according to the formula to obtain a raw material mixture, the raw materials of the auxiliary layer and the main layer are respectively melted and mixed by a single-screw extruder and a double-screw extruder after being dried and mixed by a mixing device, the main layer and the auxiliary layer are jointly cast and extruded at a die head, a cast sheet is cooled, and the reflective film is formed after longitudinal stretching, transverse stretching and heat setting treatment. The evaluation results are summarized in table 2.
Example 7
The reflective film as provided in example 1, wherein the talc in the auxiliary layer has an average particle size of 6.5 μm. The evaluation results are summarized in table 2.
Example 8
The reflective film as provided in example 2, wherein the talc in the auxiliary layer has an average particle size of 6.5 μm. The evaluation results are summarized in table 2.
Example 9
The reflective film as provided in example 3, wherein the talc in the auxiliary layer has an average particle size of 6.5 μm. The evaluation results are summarized in table 2.
Example 10
The reflective film as provided in example 4, wherein the talc in the auxiliary layer has an average particle size of 6.5 μm. The evaluation results are summarized in table 2.
Example 11
The reflective film as provided in example 5, wherein the talc in the auxiliary layer has an average particle size of 6.5 μm. The evaluation results are summarized in table 2.
Example 12
The reflective film as provided in example 6, wherein the talc in the auxiliary layer had an average particle size of 6.5 μm, the antistatic agent content was 6%, and the PET polyester resin content was 88.5%. The evaluation results are summarized in table 2.
Example 13
The reflective film as in embodiment 1, wherein the TiO in the primary layer2Has an average particle diameter of 0.1 μm; the inorganic particles with large particle size in the auxiliary layer are calcium oxide particles, the average particle size of the calcium oxide particles is 5 mu m, the content of the antistatic agent is 5 percent, and the percentage content of PET is 93 percent. The evaluation results are summarized in table 2.
Example 14
The reflective film as in embodiment 1, wherein the TiO in the primary layer2Has an average particle diameter of 0.2 μm; the average grain diameter of the talcum powder in the auxiliary layer is 15 mu m, the content of the antistatic agent is 10 percent, and the percentage content of the PET is 88 percent. The evaluation results are summarized in table 2.
Comparative example 1
The reflective film as provided in embodiment 1, wherein SiO is in the auxiliary layer2The content of (A) is 0, the mass percentage of the talcum powder is 0.1 percent, and the mass percentage of the PET is 91.9 percent. In comparative example 1, the auxiliary layer contained no SiO2The particles and talc content were too low, and the evaluation results are summarized in table 2.
Comparative example 2
The reflective film as provided in embodiment 2, wherein SiO is in the auxiliary layer28 percent, 3 percent of talcum powder, 6.5 mu m of average grain diameter of the talcum powder and 81 percent of PET. In comparative example 1, SiO in the auxiliary layer2The content of particles was too high, and the evaluation results are summarized in table 2.
Comparative example 3
The reflective film as in embodiment 1, wherein the TiO in the primary layer25%, 13% polypropylene and 82% PET. In comparative example 3, TiO in the host layer2The percentage of particles was too low and the results are summarized in table 2.
Comparative example 4
The reflective film as in embodiment 2, wherein the TiO in the primary layer2Is 8 percent of TiO2Has an average particle size of 0.4 μm, a polypropylene resin content of 5% and a PET content of 87%. In comparative example 4, the percentage of polypropylene resin in the main layer was too low and the PET content was too high, and the evaluation results are summarized in table 2.
TABLE 1 composition of reflective film compositions provided in examples and comparative examples
Table 2 results of measuring properties of the reflective films provided in examples and comparative examples
As can be seen from the detection results shown in table 2, the reflective film provided by the present invention, when applied to a short OD backlight module, can provide a uniform image, prevent the occurrence of a dark image, and have a better brightness performance. Among them, the reflective films provided in examples 2-3, 5-6, 8-9, 11-12 had good overall performance and had luminance of 2280cd/m or more2. In particular, examples 3 and 9 provide reflective films having a better overall performance.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes and modifications made according to the disclosure of the present invention are covered by the scope of the claims of the present invention.
Claims (7)
1. A reflective film, comprising a primary layer and a secondary layer disposed on the primary layer;
the main layer comprises the following components: 72-80% of polyester resin, 10-13% of incompatible resin and 10-15% of white inorganic filling particles; the average particle diameter of the white inorganic filler particles is 0.2-0.4 μm; the percentage is mass percentage;
the auxiliary layer comprises the following components: polyester resin 86.5-90%, SiO with small grain size20.1-5% of particles, 0.5-2% of inorganic particles with large particle size and 6-8% of antistatic agent, wherein the percentage is mass percentage; the small-particle-diameter SiO2The average particle diameter of the inorganic particles of the large particle diameter is from 6.5 to 10 μm;
in the auxiliary layer, the large-particle-size inorganic particles are talcum powder.
2. The film of claim 1, wherein the film is an ABA three-layer structure or an AB two-layer structure.
3. The reflective film of claim 1, wherein in the primary layer, the incompatible resin is a polypropylene resin; the white inorganic filler particles are TiO2。
4. The reflective film of claim 1, wherein the antistatic agent is selected from ethoxylated alkylamines in the auxiliary layer.
5. The reflective film of claim 1, wherein the polyester resin is selected from the group consisting of polyethylene terephthalate.
6. A backlight module, wherein the reflective film used in the backlight module is the reflective film of any one of claims 1 to 5; the OD value in the backlight module is 12-18 μm.
7. A method for producing a reflective film according to any one of claims 1 to 5, comprising the steps of:
(1) small particle size SiO for layer A2Mixing the particles, the inorganic particles with large particle size and the antistatic agent master batch in advance, adding polyester resin serving as a carrier into a mixing roll, and fully mixing to obtain a raw material mixture;
(2) weighing raw materials of the layer B according to a formula, drying and mixing the raw materials by a mixing device, extruding the raw materials of the layer B by a double-screw extruder, melting and extruding the raw materials of the layer A by a single-screw extruder, carrying out tape casting extrusion on the raw materials of the layer A and the raw materials of the layer B at a die head by using a main layer and an auxiliary layer together, cooling a casting sheet, and carrying out longitudinal stretching, transverse stretching and heat setting treatment to form the reflecting film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610222040.XA CN106908863B (en) | 2016-04-11 | 2016-04-11 | Optical reflecting film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610222040.XA CN106908863B (en) | 2016-04-11 | 2016-04-11 | Optical reflecting film and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106908863A CN106908863A (en) | 2017-06-30 |
| CN106908863B true CN106908863B (en) | 2020-10-30 |
Family
ID=59206117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610222040.XA Active CN106908863B (en) | 2016-04-11 | 2016-04-11 | Optical reflecting film and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106908863B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772729A (en) * | 2016-12-29 | 2017-05-31 | 吴中区穹窿山德毅新材料技术研究所 | A kind of optical reflectance coating of low-luster and the backlight module using the reflectance coating |
| CN107793716A (en) * | 2017-10-30 | 2018-03-13 | 汪涛 | Composite master batch for the auxiliary layer of polyester reflective film and preparation method thereof |
| CN108752629B (en) * | 2018-06-06 | 2020-10-02 | 曹立军 | Preparation method of light scattering particles |
| CN108761590A (en) * | 2018-06-06 | 2018-11-06 | 曹立军 | A kind of scattered reflection type reflectance coating and preparation method thereof |
| CN108957850A (en) * | 2018-07-03 | 2018-12-07 | 浙江锦浩光电材料有限公司 | A kind of reflectance coating and backlight module preventing display two sides brightness disproportionation |
| CN112297553A (en) * | 2019-07-31 | 2021-02-02 | 宁波长阳科技股份有限公司 | High-glossiness white reflective polyester film |
| CN110927848A (en) * | 2019-12-27 | 2020-03-27 | 浙江启诚新材料科技有限公司 | Reflecting film and preparation method thereof |
| CN112485946B (en) * | 2020-12-02 | 2022-11-04 | 合肥乐凯科技产业有限公司 | Reflecting film for thin direct type liquid crystal display device and preparation method thereof |
| CN117183535B (en) * | 2023-11-02 | 2024-02-09 | 宁波长阳科技股份有限公司 | High-reflection ultraviolet-resistant foaming gap film and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020015299A1 (en) * | 2000-04-26 | 2002-02-07 | Yupo Corporation | Light reflector |
| CN101910881A (en) * | 2007-12-26 | 2010-12-08 | 东丽株式会社 | White laminated polyester film for reflecting sheets |
| CN103969723A (en) * | 2014-04-30 | 2014-08-06 | 宁波东旭成新材料科技有限公司 | Efficient diffuse reflection film and preparing method thereof |
| CN104608446A (en) * | 2015-01-16 | 2015-05-13 | 宁波长阳科技有限公司 | White reflective polyester film and preparation method thereof |
| CN104614792A (en) * | 2015-01-26 | 2015-05-13 | 宁波长阳科技有限公司 | Anti-scraping reflector plate and preparation method thereof |
-
2016
- 2016-04-11 CN CN201610222040.XA patent/CN106908863B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020015299A1 (en) * | 2000-04-26 | 2002-02-07 | Yupo Corporation | Light reflector |
| CN101910881A (en) * | 2007-12-26 | 2010-12-08 | 东丽株式会社 | White laminated polyester film for reflecting sheets |
| CN103969723A (en) * | 2014-04-30 | 2014-08-06 | 宁波东旭成新材料科技有限公司 | Efficient diffuse reflection film and preparing method thereof |
| CN104608446A (en) * | 2015-01-16 | 2015-05-13 | 宁波长阳科技有限公司 | White reflective polyester film and preparation method thereof |
| CN104614792A (en) * | 2015-01-26 | 2015-05-13 | 宁波长阳科技有限公司 | Anti-scraping reflector plate and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106908863A (en) | 2017-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106908863B (en) | Optical reflecting film and preparation method thereof | |
| TW527507B (en) | White film for surface light source | |
| KR20160091809A (en) | Scraping-proof reflective plate and preparation method thereof | |
| JP6174453B2 (en) | White polyester film | |
| JP2011042784A (en) | White porous polyester film and method for producing the same | |
| JP6295664B2 (en) | White polyester film for liquid crystal display, method for producing the same, and backlight for liquid crystal display | |
| KR20060045911A (en) | Low density white polyester film | |
| CN112485946B (en) | Reflecting film for thin direct type liquid crystal display device and preparation method thereof | |
| JP5464997B2 (en) | Light reflector and surface light source device | |
| JP6219673B2 (en) | White polyester film | |
| EP2751176B1 (en) | Optical film and preparation method thereof | |
| KR20190106398A (en) | White polyester film and reflective sheet using the same | |
| KR102020532B1 (en) | Manufacturing method of white polyester reflective film, reflective film thereby, and reflective sheet using the same | |
| JP2008162157A (en) | Laminated polyester film | |
| TWI579323B (en) | White film | |
| JP2007178505A (en) | White polyester film for display reflecting plate | |
| WO2010073611A1 (en) | Light reflector and surface light source apparatus | |
| JP2010052329A (en) | White color laminate polyester film for liquid crystal reflection sheet | |
| JP2010032864A (en) | Light diffusing film | |
| JP6464845B2 (en) | White film | |
| KR101561288B1 (en) | Low gloss white polyester film, method of manufacturing the same and reflective sheet thereof | |
| JP5338963B2 (en) | White laminated polyester film for liquid crystal reflection | |
| JP2002178472A (en) | Laminated polyester film | |
| JP5464996B2 (en) | Light reflector and surface light source device | |
| KR20170087314A (en) | White polyester reflective film and method for manufacturing the same and reflective sheet using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |