CN114859604A - Shading reflection film, backlight module and preparation method thereof - Google Patents

Shading reflection film, backlight module and preparation method thereof Download PDF

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Publication number
CN114859604A
CN114859604A CN202210619521.XA CN202210619521A CN114859604A CN 114859604 A CN114859604 A CN 114859604A CN 202210619521 A CN202210619521 A CN 202210619521A CN 114859604 A CN114859604 A CN 114859604A
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light
shading
shielding
film
reflecting
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CN114859604B (en
Inventor
刁锐敏
赖新益
范家榕
朱邦峯
龙涛
李佳霖
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Sichuan Longhua Film Co ltd
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Sichuan Longhua Film Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • B29D11/00788—Producing optical films
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • C—CHEMISTRY; METALLURGY
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
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    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
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Abstract

The invention discloses a light shading reflection film, a backlight module and a preparation method thereof, which are mainly used for solving the problem of light leakage of a thin reflection film/sheet, wherein the light shading reflection film is a double-sided film which is prepared by adopting a one-step processing and forming method based on a reflection material and a light shading material and has a reflection surface and a light shading surface, and has high light shading effect and high reflectivity. In order to better prepare the shading reflection film, the invention also provides a method for preparing the shading reflection film by adopting a multilayer co-extrusion technology, and the shading reflection film can also be used for a backlight module and the preparation thereof.

Description

Shading reflection film, backlight module and preparation method thereof
Technical Field
The invention belongs to the field of optical film materials, and particularly relates to a light shading reflection film, a backlight module and a preparation method of the light shading reflection film.
Background
Flat panel displays have been widely used in televisions, computer monitors, notebook computers, mobile phones, digital cameras, palm top computers, GPS navigators, light-guiding keyboards, and the like. The image light source of these liquid crystal displays is provided by the backlight module therein, and the performance of the backlight module directly affects the display quality of the LCD, especially the brightness of the backlight source, and directly affects the brightness of the LCD surface. According to the position difference of the light source, the backlight module can be divided into an edge-light type backlight module and a direct type backlight module, and as the LCD module is continuously developed to the directions of being brighter, lighter and thinner, the edge-light type LED backlight becomes the mainstream of the development of the backlight source at present.
In addition, in the keyboard system, the trend of using the light guiding keyboard is continuously growing in recent years. The application of the light-guiding keyboard comprises the keyboard field of a notebook computer besides a common display keyboard. These light guiding keyboards are also composed of a backlight module of the keyboard, and the characteristic is to provide enough brightness under each key so that the keyboard emits light.
The liquid crystal backlight and light guide keyboard module mainly comprises a light source, a reflector, a light guide plate, and a plurality of light sourcesThe optical film-like composition has the characteristics of high brightness, long service life, uniform light emission and the like. The reflecting film/sheet mainly functions to reflect light leaking out of the bottom of the light guide plate efficiently without loss, thereby reducing light loss, reducing power consumption, and providing light saturation of the liquid crystal display panel. The reflective film/sheet is mainly made of transparent resin such as PET + TiO 2 The main principle of the system is TiO, and the system is made into a reflecting sheet through fine foaming 2 The refractive index of (2.62) is high, wherein the diameter of the bubble is about a few particles, the refractive index is 1.00, a good zigzag interface is formed between the bubble and the PET resin, and after light coming out of the light guide plate passes through the reflecting sheet, most of the light can return to the light guide plate through repeated refraction paths.
However, with the trend of light and thin display panels and light guide keyboards, the light and thin backlight module is currently the mainstream trend of light and thin, so that the backlight thickness needs to be effectively reduced by using a thin reflector plate, but the reduction of the thickness of the reflector plate brings with the reduction of the thickness of the reflector plate the phenomenon of light leakage at the back of the backlight module caused by the light transmission of the reflector plate, and further the backlight module is assembled on a system structure to cause system light leakage, so that the use requirement cannot be met.
At present, for the backlight light leakage phenomenon caused by the light transmission of the thin reflector, the following two solutions are mainly adopted:
first, a light-shielding coating process is applied to the back surface (non-light-transmitting plate contact surface) of the reflective sheet, for example: the patent publication No. CN 111239873A discloses a high light-shielding composite reflection plate and a preparation method thereof, which solves the problems of heavy weight and poor light-shielding performance of a backlight module and provides a composite reflection plate with a multilayer structure of a reflection layer/a support layer/a light-shielding layer or a reflection layer/a light-shielding layer/a support layer, wherein the light-shielding layer is prepared by forming a coating liquid by using light-shielding layer resin and a curing agent, then coating the coating liquid on a composite plate and carrying out cross-linking and curing.
Secondly, a non-light-transmitting film or material is attached to the back surface (non-light-transmitting plate contact surface) of the reflector plate, such as: the invention patent with publication number CN111694080A discloses a high-shielding fingerprint-resistant backlight module reflection film and a preparation process thereof, wherein the patent firstly coats a high-refraction layer for realizing the reflection function and an anti-fingerprint coating with the anti-fingerprint function on a base layer to prepare an anti-fingerprint reflection plate, and finally, a silver-plated film with the shading effect is attached to the surface of the anti-fingerprint reflection plate.
In both of the above two methods, the light shielding layer/film is added by coating or bonding on the basis of the existing reflector plate to achieve the purpose of reducing the light transmission of the reflector plate, but in the actual production process, the processing procedure of the reflector plate is complicated, the working hours are increased, and the material cost is increased.
Disclosure of Invention
The invention aims to solve the problem of light leakage of a thin reflecting film/sheet, and provides a light shading reflecting film/sheet which is a double-sided film with a reflecting surface and a light shading surface and is prepared by adopting a one-step processing and forming method based on a reflecting material and a light shading material, and has high light shading effect and high reflectivity. In order to better prepare the shading reflective film/sheet, the invention also provides a method for preparing the shading reflective film by adopting a multilayer co-extrusion technology. Meanwhile, the invention also provides a backlight module containing the shading reflective film and a preparation method thereof.
The invention is realized by the following technical scheme: a light shading reflection film is characterized in that a reflection material is homogenized and then is co-extruded with a light shading material to prepare a film with a double-sided structure, one side of the film is a reflection surface, the other side of the film is a light shading surface, the reflection material comprises optical transparent resin and inorganic particles, and the light shading material comprises resin and light shading master batch.
The reflecting surface comprises at least one reflecting layer made of a reflecting material; the shading surface comprises at least one shading layer made of shading materials.
The optically transparent resin is at least one selected from polypropylene resin (PP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polytrimethylene terephthalate, polybutylene terephthalate (PBT), Polycarbonate (PC) and polymethyl methacrylate (PMMA).
Or further selecting resin particles such as: particles made of a resin such as a polyester resin, a polyamide resin, a polyurethane resin, an acrylic resin, a methacrylic resin (e.g., PMMA), a polyamide resin, a polyethylene resin, a polypropylene resin, a polyvinyl chloride resin, a polyvinylidene 1, 1-dichloride resin, a polystyrene resin, a polyvinyl acetate resin, a fluorine resin, or a silicone resin.
The inorganic filler is at least one selected from calcium carbonate, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, zinc sulfide, calcium phosphate, silica, alumina, mica titanium, talc, clay, kaolin, lithium fluoride and calcium fluoride.
Further, other known various additives such as a flame retardant, an antioxidant, an antistatic agent, etc. may be further included in the reflective material. Therefore, the amounts of the components constituting the reflective material may be: 60-90% of optical transparent resin, 13.3-43.3% of inorganic filler, 3-6% of flame retardant, 1-3.0% of antioxidant and 2-5% of antistatic agent.
Further, the functional component in the light-shielding material is a light-shielding master batch such as a black master batch, and the light-shielding master batch is not particularly limited as long as the processability is not affected, and in addition, other various known additives such as a flame retardant, an antioxidant, an antistatic agent and the like may be similarly added to the resin selected for the light-shielding material. Therefore, the amounts of the respective components constituting the light-screening material may be respectively: 60-90% of resin, 0.3-1% of black master batch, 3-6% of flame retardant, 1-3.0% of antioxidant and 2-5% of antistatic agent.
The above-mentioned resin is an optically transparent resin, and the light shielding material is the same as or different from the optically transparent resin selected among the reflective materials. Furthermore, considering the forming effect of the co-extrusion process and the improvement of the weather resistance of the finished product, the scheme with the same optical transparent resin is preferred, and the finished product is not easy to deform due to the same material shrinkage rate and is not easy to warp and deform after the high-temperature high-humidity reliability test.
The flame retardant mentioned above preferably contains at least one of an organophosphorus flame retardant and a silicon-containing flame retardant. Among them, known organic phosphorus-containing flame retardants can be used, and specifically, bisphenol a diphosphate, hydroquinone diphosphate, resorcinol diphosphate, trisphenol triphosphate, and bisphenol a bis (xylyl phosphate) can be used, and they are selected as needed. Specific examples of the silicon-containing flame retardant include dimethoxydimethylsilane, diethoxydimethylsilane, ethoxytrimethylsilane, diethoxydiphenylsilane, triethoxyphenylsilane, dimethylphenylsilane, pentamethyldisilane, dimethylethylsilane, and poly (dimethylsiloxane) oligomer.
As the above-mentioned antioxidant, there may be mentioned, as a hindered phenol-based heat stabilizer, for example: 2-tert-butyl-6- (3-tert-butyl-2-hydroxy-5-methylbenzyl) benzylmethacrylate, 2-phenylphenacrylate, 6-di-tert-butylphenyl (methacrylate) and 6-penta-di-tert-amylphenyl (methacrylate).
The antistatic agents mentioned above may be mentioned, for example: stearyl trimethyl quaternary ammonium hydrochloride, stearamidopropyl hydroxyethyl quaternary ammonium nitrate, sodium p-nonylphenoxypropyl sulfonate, and the like.
A preparation method of the shading reflective film adopts the reflective material and the shading material, the homogenized reflective material and the homogenized shading material are respectively fed into an extruder, and the shading reflective film is obtained after multilayer co-extrusion, stretching and sizing.
Furthermore, the extruder can adopt conventional co-extrusion equipment, and in the preparation process, temperature control is a key, so that the optical performance of the film, including hue, transmittance and the like, is directly influenced. During the production process, the melting temperature of PC is controlled at 240 ℃, the melting temperature of PMMA is controlled at 200 ℃, and the melting temperature of PP is controlled at 170 ℃.
The stretching comprises the steps of longitudinally stretching the film sheet obtained by co-extrusion by 1.5-2 times and then transversely stretching by 1.5-2 times.
In the longitudinal stretching and the transverse stretching, the resin film deforms along with the stretching, but the resin film serving as particles does not deform along with the stretching, because a large number of cells with different sizes are formed around the particles, so that the diffuse reflection effect is achieved.
The thickness of the shading reflection film is 0.05-0.25 mm. The thickness of the related reflecting surface is 0.025-0.125 mm, and the thickness of the light shading surface is 0.025-0.125 mm.
A backlight module comprising the light-shielding reflective film according to claim 1.
A method for preparing a backlight module comprising a light-shielding reflection film, wherein the light-shielding reflection film is prepared by the method of claim 6.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention can be used for solving the light leakage problem of the thin reflecting film/sheet, provides the shading reflecting film which is prepared by co-extruding a reflecting material and a shading material at one time and has high shading and reflecting effects, has simple forming process, lower cost and short construction period, and is suitable for large-scale production, and the shading reflecting film in the invention has a double-sided structure, and the thickness of the film can be controlled within 0.05-0.25 mm.
(2) The co-extrusion process of the present invention can realize the thickness adjustment of the reflective layer and the light shielding layer to obtain films with different reflective effects. For example, in the practical application process, the thickness and the number of the reflective layer and the light-shielding layer can be adjusted arbitrarily according to the requirements of customers, so as to meet different application scenarios.
(3) The invention adopts the homogeneous reflective material as one of the raw materials, has good forming effect of the co-extrusion process, and can achieve the dimensional stability and weather resistance of the co-extruded product with higher quality.
(4) In the co-extrusion process, the high-quality optical property performance can be achieved by adjusting the proper temperature range, and the problems of yellowing color shift of raw materials or poor crystal melting and the like are easily caused due to over-high or over-low temperature, so that the hue and the transmittance of a finished product are influenced.
(5) In the invention, the selection of the light-shielding material and the reflective material is also one of the keys influencing the effect of the finished product of the co-extrusion process, for example, when the light-shielding material and the reflective material are selected from the same material, the finished product is not easy to deform due to the same shrinkage rate of the material, and is also not easy to warp and deform after a high-temperature high-humidity reliability test, so that the forming effect and the weather resistance of the finished product are both improved.
(6) The invention can further use the roller surface to make irregular embossing structure on the surface (shading surface) of the shading reflection film in the co-extrusion process, and directly make the surface of the shading layer presenting irregular depth surface characteristics in the extrusion process, for example, forming a concave-convex structure with height difference within 100um on the surface of the film, and the height average value needs to be larger than 1/2 of the highest and lowest height difference, so as to be beneficial to reducing the electrostatic adsorption between adjacent materials and avoiding the fingerprint or slight scratch of the assembling personnel.
(7) The invention utilizes the co-extrusion process to form a multi-layer reflecting layer, utilizes the hole density generated by the reflecting material to form the diffuse reflection of the finished product (the higher the hole density is, the more the diffuse reflection times can be formed), and simultaneously utilizes the co-extrusion process and the stretch forming process to adjust the thickness of the shading material to meet different application scenes, thereby obtaining the shading and reflecting film with high shading effect and high reflectivity, and the shading and reflecting film meets the effects that the light transmittance is less than 0.1 percent and the reflectivity is more than 90 percent.
(8) The shading reflective film is suitable for a backlight module of a liquid crystal or light guide keyboard, has V0 anti-burning grade, and also meets the safety standard requirements of terminal brand customers.
Drawings
Fig. 1 shows a conventional thin film reflective sheet obtained by coating or spreading.
Fig. 2 shows a conventional thin film reflective sheet obtained by lamination.
FIG. 3 is a schematic view of a double-layered light-shielding reflective film obtained by co-extrusion according to the present invention.
FIG. 4 is a schematic view of a multilayer opaque film obtained by co-extrusion according to the present invention.
Detailed Description
The objects, technical solutions and advantageous effects of the present invention will be described in further detail below.
It is to be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention claimed, and unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In order to solve the problem of backlight leakage caused by light transmission of the thin reflective sheet, the conventional method employs an additional process and material to reduce the light transmission of the reflective sheet, thereby causing the defects of complicated processing procedure, long time and high cost of the reflective plate. For example, as shown in fig. 1, a light shielding material is formed on a reflective material of a thin reflective sheet (an upper layer is a reflective material, and a lower layer is a light shielding material) by coating or spreading, or as shown in fig. 2, a light shielding material is formed on a reflective material of a thin reflective sheet (an upper layer is a reflective material, a middle layer is an adhesive layer, and a lower layer is a light shielding material) by attaching, when preparing, the thin reflective sheet can be prepared by an additional process, therefore, the defects of complicated processing procedure, long working time, and high cost exist, and the thin reflective sheet is not beneficial to the improvement of production efficiency of enterprises and large-scale production. In order to solve the above problems, the present invention provides a novel method for preparing a light-shielding reflective film, wherein the light-shielding reflective film is prepared by co-extrusion and stretching to be integrally formed, so that the manufacturing process of the light-shielding reflective film can be simplified, the production efficiency can be improved, the structure of the light-shielding reflective film can be reasonably controlled in the manufacturing process, and the light-shielding reflective film which meets the customer requirements and has high light-shielding effect and high reflectivity can be prepared.
The following examples are provided to illustrate specific embodiments of the present invention, and it is understood that the scope of the present invention is not limited to the following examples.
Example 1:
the formula of the reflecting material comprises: 80.0% of PP, 10.0% of titanium dioxide, 4.0% of zinc carbonate, 3.0% of flame retardant, 1.0% of antioxidant and 2.0% of antistatic agent.
The formula of the shading material comprises: 85.0% of PP, 5.0% of black master batch, 5.0% of flame retardant, 1.0% of antioxidant and 5.0% of antistatic agent.
The reflecting material and the shading material which are prepared according to the formula are respectively homogenized, and are fed into an extruder through a hopper according to the volume ratio of 3: 2, the temperature is controlled at 170 ℃, a membrane consisting of a reflecting layer and a shading layer is obtained through extrusion through a double-layer extrusion die head, the total thickness of the membrane is about 0.18mm, wherein the reflecting layer is about 0.12mm, and the shading layer is also about 0.06 mm.
The above-mentioned film is fed into a stretching process, after the film is longitudinally stretched by 1.5 times, then transversely stretched by 1.5 times, the light shading and reflecting film (the upper layer is a reflecting layer, and the lower layer is a light shading layer) shown in fig. 3 is obtained, the total thickness of the light shading and reflecting film is about 0.08mm, wherein the reflecting layer is about 0.055mm, and the light shading layer is also about 0.025 mm.
Example 2:
the formula of the reflecting material comprises: 75.7% of PP, 13.3% of silicon dioxide, 6.0% of flame retardant, 3.0% of antioxidant and 2.0% of antistatic agent.
The formula of the shading material comprises: 85.0% of PP, 1.0% of black master batch, 6.0% of flame retardant, 3.0% of antioxidant and 5.0% of antistatic agent.
The light-shielding reflective film having the structure shown in fig. 3 was prepared in the same manner as in example 1 using the reflective material and the light-shielding material of the above-described formulations.
Example 3:
the formula of the reflecting material comprises: 60.0% of PET, 13.3% of barium sulfate, 20.0% of zinc sulfide, 3.6% of flame retardant, 1.1% of antioxidant and 2.0% of antistatic agent.
The formula of the shading material comprises: 88.0 percent of PP, 0.5 percent of black master batch, 5.5 percent of flame retardant, 2.0 percent of antioxidant and 4.0 percent of antistatic agent.
The light-shielding reflective film having the structure shown in fig. 3 was prepared in the same manner as in example 1 using the reflective material and the light-shielding material of the above-described formulations.
Example 4:
the formula of the reflecting material comprises: 68.0 percent of PMMA, 25.0 percent of zinc oxide, 3.0 percent of flame retardant, 1.5 percent of antioxidant and 2.5 percent of antistatic agent.
The formula of the shading material comprises: 89.7 percent of PMMA, 0.3 percent of black master batch, 5.0 percent of flame retardant, 2.7 percent of antioxidant and 3.0 percent of antistatic agent.
Using the reflective material and the light-shielding material of the above-mentioned formulations, a light-shielding reflective film having a structure shown in FIG. 3 was prepared in the same manner as in example 1 (at a temperature of 200 ℃ C.).
Example 5:
the formula I of the reflecting material comprises: 80.0% of PP, 7.0% of silicon dioxide, 7.0% of mica, 3.0% of flame retardant, 1.0% of antioxidant and 2.0% of antistatic agent.
The formula II of the reflecting material is as follows: 80.0% of PP, 7.0% of silicon dioxide, 7.0% of calcium carbonate, 3.0% of flame retardant, 1.0% of antioxidant and 2.0% of antistatic agent.
The formula of the shading material comprises: 89.0% of PP, 1.0% of black master batch, 3.0% of flame retardant, 2.0% of antioxidant and 5.0% of antistatic agent.
The reflective material and the shading material adopting the formula are fed into an extruder through a hopper according to the volume ratio of 1.2: 1, the temperature is controlled at 170 ℃, and a film sheet consisting of a plurality of reflective layers and shading layers is obtained through extrusion through a three-layer extrusion die head, wherein the total thickness of the film sheet is about 0.3mm, the total thickness of the plurality of reflective layers is about 0.21mm, and the total thickness of the plurality of shading layers is about 0.09 mm.
And (3) the film is sent to a stretching process, the film is longitudinally stretched by 2 times and then transversely stretched by 2 times, and the shading and reflecting film (the upper two layers are reflecting layers, and the lower layer is a shading layer) shown in the figure 4 is obtained, wherein the total thickness of the shading and reflecting film is about 0.075mm, the two reflecting layers are about 0.053mm, and the shading layer is also about 0.022 mm.
Example 6:
the formula I of the reflecting material comprises: 66.0 percent of PP, 10.0 percent of magnesium carbonate, 10.0 percent of zinc carbonate, 6.0 percent of flame retardant, 3.0 percent of antioxidant and 5.0 percent of antistatic agent.
The formula II of the reflecting material is as follows: 76.0% of PP, 10.0% of silicon dioxide, 6.0% of flame retardant, 3.0% of antioxidant and 5.0% of antistatic agent.
The formula of the shading material comprises: 85.0% of PP, 1.0% of black master batch, 6.0% of flame retardant, 3.0% of antioxidant and 5.0% of antistatic agent.
The light-shielding reflection film having the structure shown in fig. 4 was prepared in the same manner as in example 5 using the reflection material and the light-shielding material of the above-described formulations.
Example 7:
the formula I of the reflecting material comprises: 72.0 percent of PC, 16.0 percent of calcium carbonate, 5.0 percent of flame retardant, 2.0 percent of antioxidant and 5.0 percent of antistatic agent.
The formula II of the reflecting material is as follows: 88.0 percent of PC, 6.0 percent of flame retardant, 1.0 percent of antioxidant and 5.0 percent of antistatic agent.
The formula of the shading material comprises: 87.2 percent of PC, 0.8 percent of black master batch, 5.0 percent of flame retardant, 2.0 percent of antioxidant and 5.0 percent of antistatic agent.
The light-shielding reflective film having the structure shown in fig. 4 was prepared in the same manner as in example 5 using the reflective material and the light-shielding material of the above-described formulations.
Example 8:
the formula I of the reflecting material comprises: 77.0% of PET, 16.0% of silicon dioxide, 4.0% of flame retardant, 1.0% of antioxidant and 2.0% of antistatic agent.
The formula II of the reflecting material is as follows: 90.0% of PET, 6.0% of flame retardant, 2.0% of antioxidant and 2.0% of antistatic agent.
The formula of the shading material comprises: 90.0% of PET, 1.0% of black master batch, 5.0% of flame retardant, 1.0% of antioxidant and 2.0% of antistatic agent.
Using the reflective material and the light-shielding material of the above-mentioned formulations, a light-shielding reflective film having a structure shown in FIG. 4 was prepared in the same manner as in example 5 (at a temperature of 260 ℃).
Comparative example 1:
the formula of the reflecting material comprises: PET, barium sulfate and a flame retardant in proper proportion.
The formula of the shading material comprises: PET, a flame retardant and a black master batch in a proper proportion.
The reflecting material and the shading material with the formula are adopted, a proper amount of homogenized reflecting material is fed into an extruder, the temperature is controlled to be 260 ℃, a reflecting film is obtained through extrusion, a proper amount of shading material is fed into the extruder, the temperature is controlled to be 260 ℃, the shading film is obtained through extrusion, an adhesive layer is attached to the reflecting film, then a shading layer is attached to the adhesive layer, and the thin film reflecting sheet with the structure shown in the figure 1 is prepared, wherein the total thickness of the thin film reflecting sheet is about 0.155mm, the reflecting material is about 0.08mm, and the shading material is about 0.075 mm.
The above examples 1 to 8 and comparative example 1 do not particularly limit the flame retardant, antioxidant and antistatic agent of the reflective material and light-shielding material, and can be selected conventionally according to the product requirements in practical use. Of course, the components selected for the flame retardant, the antioxidant and the antistatic agent in the selected examples and comparative document 1 were the same during the following tests of the present invention.
The light transmittance and reflectance tests were performed on the light-shielding and light-reflecting films of examples 1 to 8 and comparative example 1, as shown in table 1 below. The light transmittance test method employs known equipment such as: ASTM D1003 and NDH7000-2, reflectance testing methods used known equipment ASTM E2177 and UH4150 spectrophotometers.
TABLE 1
Figure 878506DEST_PATH_IMAGE002
As can be seen from the above table, the light-shielding reflective films prepared by co-extrusion in examples 1 to 8 do not directly affect the reflectivity compared to the film reflective sheet in comparative example 1, and can also be used to prepare products with high light-shielding effect and high reflectivity. In addition, from the perspective of the preparation process, the co-extrusion process adopted in the embodiments 1 to 8 is simpler than that of the comparative example 1, is convenient for large-scale production, and is beneficial to improvement of the production efficiency. In addition, from the product thickness, the light-shielding reflective films of embodiments 1 to 8 are thinner than the film reflective sheet of comparative example 1 due to the lack of the adhesive layer, and can also meet the user requirement of light thinness of the backlight module.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims (10)

1. A light-shielding reflective film, comprising: the film with the double-sided structure is prepared by homogenizing a reflecting material and then co-extruding the reflecting material and a shading material, wherein one side of the film is a reflecting surface, the other side of the film is a shading surface, the reflecting material comprises optical transparent resin and inorganic filler, and the shading material comprises resin and shading master batch.
2. The light shielding reflective film according to claim 1, wherein: the reflecting surface comprises at least one reflecting layer made of reflecting materials; the shading surface comprises at least one shading layer made of shading materials.
3. The light shielding reflective film according to claim 1, wherein: the optical transparent resin is at least one selected from polypropylene resin, polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate and polycarbonate.
4. The light shielding reflective film according to claim 1, wherein: the inorganic filler is at least one selected from calcium carbonate, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, zinc sulfide, calcium phosphate, silica, alumina, mica titanium, talc, clay, kaolin, lithium fluoride and calcium fluoride.
5. The light shielding reflection film according to claim 3, wherein: the resin is an optically transparent resin, and the light-shielding material is the same as or different from the optically transparent resin selected from the reflective materials.
6. A method for preparing a light shading reflection film is characterized by comprising the following steps: the reflective material and the light-shielding material according to claim 1, wherein the reflective material and the light-shielding material are respectively fed into an extruder after being homogenized, and the reflective film is obtained after co-extrusion, stretching and sizing.
7. The method for preparing a light-shielding reflective film according to claim 6, wherein: the stretching comprises the steps of longitudinally stretching the film sheet obtained by co-extrusion by 1.5-2 times and then transversely stretching by 1.5-2 times.
8. The method for preparing a light-shielding reflective film according to claim 6, wherein: the thickness of the shading reflection film is 0.05-0.25 mm.
9. A backlight module is characterized in that: comprising the light-shielding reflective film according to claim 1.
10. A method for preparing a backlight module is characterized in that: comprising a light-shielding reflection film obtained by the method according to claim 6.
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CN103542276A (en) * 2012-07-17 2014-01-29 昆达电脑科技(昆山)有限公司 Method for evening front light source of reflecting type display panel
CN106739334A (en) * 2016-12-14 2017-05-31 江苏瀚隆家纺有限公司 A kind of light-proofness composite membrane and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006051712A (en) * 2004-08-12 2006-02-23 Mitsubishi Polyester Film Copp Coextrusion-laminated polyesther film
JP2006343445A (en) * 2005-06-08 2006-12-21 Mitsubishi Engineering Plastics Corp Light reflecting material and its manufacturing method
JP2007290164A (en) * 2006-04-21 2007-11-08 Toyobo Co Ltd Laminated polyester film and mirror surface reflecting film
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