CN114859604B - Shading reflecting film, backlight module and preparation method of backlight module - Google Patents

Shading reflecting film, backlight module and preparation method of backlight module Download PDF

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Publication number
CN114859604B
CN114859604B CN202210619521.XA CN202210619521A CN114859604B CN 114859604 B CN114859604 B CN 114859604B CN 202210619521 A CN202210619521 A CN 202210619521A CN 114859604 B CN114859604 B CN 114859604B
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shading
light
reflecting
film
shielding
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CN114859604A (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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • 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
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • 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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    • C08J2323/12—Polypropene
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    • C08J2333/00—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
    • 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
    • C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
    • C08J2333/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • 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
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/12—Polypropene
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • 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
    • C08J2433/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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    • C08J2469/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
    • 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
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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    • C08K2003/267—Magnesium carbonate
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    • 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
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract

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

Description

Shading reflecting film, backlight module and preparation method of backlight module
Technical Field
The invention belongs to the field of optical film materials, and particularly relates to a shading reflective film, a backlight module and a preparation method thereof.
Background
In the past, flat panel displays have been widely used in televisions, computer monitors, notebook computers, cellular phones, digital cameras, palm top computers, GPS navigators, light guide keyboards, and the like. The picture light source of the liquid crystal display is provided by the backlight module, and the performance of the backlight module can directly influence the display quality of the LCD, particularly the brightness of the backlight source and the brightness of the surface of the LCD. According to the different positions of the light sources, the backlight module can be divided into an edge light type backlight module and a direct type backlight module, and along with the continuous development of the LCD module towards brighter, lighter and thinner directions, the edge light type LED backlight becomes the main stream of the current development of the backlight.
In addition, in keyboard systems, the trend of using light-guiding keyboards has been growing in recent years. Applications for light-conducting keypads include the keyboard field of notebook computers in addition to the general display keyboards. The light guide keyboards also consist of a backlight film group of the keyboard, and the characteristic is that enough brightness is provided under each key so that the keyboard emits light sources.
The liquid crystal backlight and light guide keyboard module mainly comprises a light source, a reflecting sheet, a light guide plate and various optical films, and has the characteristics of high brightness, long service life, uniform light emission and the like. The main function of the reflecting film/sheet is to reflect the light leaking out of the bottom of the light guide plate with high efficiency and no loss, thereby reducing the light loss, reducing the electricity consumption and providing the light saturation of the liquid crystal display surface. The reflecting film/sheet being predominantly of transparent resin such as PET+TiO 2 The system is made into reflecting sheet by fine foaming, and the main principle is TiO 2 The refractive index of the light guide plate is very high, 2.62, wherein the diameter of the bubble is about a plurality of particles, the refractive index is 1.00, a good zigzag interface is formed between the light guide plate and the PET resin, and most of the light can be returned to the light guide plate through repeated refractive paths after the light from the light guide plate passes through the reflecting sheet.
However, along with the trend of light and thin display panels and light guide keypads, the light and thin backlight module has become a mainstream trend at present, so a thin reflective sheet is required to be used to effectively reduce the thickness of the backlight, but the thickness reduction of the reflective sheet brings with it that the reflective sheet transmits light to cause the light leakage phenomenon at the back of the backlight module, so that the backlight module is assembled to a system structure to cause the light leakage of the system, and the use requirement cannot be met.
At present, the backlight light leakage phenomenon is caused by light transmission of a thin reflecting plate, and the following two main solutions are provided:
firstly, a light shielding coating is applied to the back surface (non-light guide plate contact surface) of the reflecting sheet, for example: the invention patent with publication number CN 111239873A discloses a high light-shielding composite reflecting plate and a preparation method thereof, and aims to solve the problems of heavy weight and poor light shielding performance of a backlight module.
Secondly, attaching a non-light-transmitting film or material on the back surface (non-light guide plate contact surface) of the reflecting sheet, for example: the invention patent with publication number of CN111694080A discloses a high shielding fingerprint-resistant backlight module reflecting film and a preparation process thereof.
The two ways are to add a shading layer/film on the basis of the existing reflector by coating or attaching so as to achieve the purpose of reducing the light transmission of the reflector, but in the actual production process, the processing procedure of the reflector is complicated, the working time is 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 shading reflecting film/sheet which is a double-sided film with a reflecting surface and a shading surface, and has high shading effect and high reflectivity, wherein the double-sided film is prepared by adopting a one-step processing molding method based on reflecting materials and shading materials. In order to better prepare the shading reflecting film/sheet, the invention also provides a method for preparing the shading reflecting film by adopting a multilayer coextrusion technology. Meanwhile, the invention also provides a backlight module containing the shading and reflecting film and a preparation method thereof.
The invention is realized by the following technical scheme: a light-shielding reflecting film is prepared through homogenizing reflecting material, co-extruding it with light-shielding material to obtain a film with double-sided structure, and features that one surface of film is reflecting surface and another surface is light-shielding surface.
The reflecting surface comprises at least one reflecting layer made of reflecting materials; the light shielding surface includes at least one light shielding layer made of a light shielding material.
The optically transparent resin is at least one selected from polypropylene resin (PP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polypropylene terephthalate, polybutylene terephthalate (PBT), polycarbonate (PC) and polymethyl methacrylate (PMMA).
Or further selecting resin particles such as: particles formed 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 chloride 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, silicon dioxide, aluminum oxide, mica titanium, talcum, clay, kaolin, lithium fluoride and calcium fluoride.
Further, other known various additives such as flame retardants, antioxidants, antistatic agents, etc. may be also included in the reflective material. Thus, the amounts of the components constituting the reflective material may be respectively: 60 to 90 percent of optically transparent resin, 13.3 to 43.3 percent of inorganic filler, 3 to 6 percent of flame retardant, 1 to 3.0 percent of antioxidant and 2 to 5 percent 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 other known various additives such as a flame retardant, an antioxidant, an antistatic agent, and the like may be added to the resin selected for the light-shielding material. Thus, the amounts of the respective components constituting the light shielding material may be respectively: 60 to 90 percent of resin, 0.3 to 1 percent of black master batch, 3 to 6 percent of flame retardant, 1 to 3.0 percent of antioxidant and 2 to 5 percent 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 from the reflecting materials. Furthermore, in consideration of the molding effect of the coextrusion process and the improvement of the weather resistance of the finished product, the same scheme of the optically 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 organic phosphorus flame retardant and a silicon-containing flame retardant. The organic phosphorus-containing flame retardant may be any known flame retardant, and specifically may be bisphenol A bisphosphate, hydroquinone bisphosphate, resorcinol bisphosphate, triphenol triphosphates, bisphenol A bis (xylyl phosphate), and the like, and may be selected according to the need when used. The silicon-containing flame retardant may be specifically dimethoxydimethylsilane, diethoxydimethylsilane, ethoxytrimethylsilane, diethoxydiphenylsilane, triethoxyphenylsilane, dimethylphenylsilane, pentamethyldisilane, dimethylethylsilane, poly (dimethylsiloxane) oligomer, or the like.
The above-mentioned antioxidants may be exemplified as the hindered phenol-based heat stabilizer: 2-tert-butyl-6- (3-tert-butyl-2-hydroxy-5-methylbenzyl) benzylmethacrylate, 2-phenylphenyl acrylate, 6-di-tert-butylphenyl (methacrylate), 6-pentanediol-di-tert-pentylphenyl (methacrylate), and the like.
The antistatic agents mentioned above may be exemplified by, for example: stearyl trimethyl quaternary ammonium salt, stearamidopropyl hydroxyethyl quaternary ammonium nitrate, sodium p-nonylphenoxy propyl sulfonate and the like.
The preparation method of the shading reflecting film adopts the reflecting material and the shading material, the homogenized reflecting material and the shading material are respectively sent into an extruder, and the shading reflecting film is obtained after multilayer coextrusion, stretching and shaping.
Further, the extruder can adopt conventional coextrusion equipment, and in the preparation process, temperature control is critical, so that the optical performance of the film, including hue, transmittance and the like, is directly affected. In the production process, the PC melting temperature can be controlled at 240 ℃, the PMMA melting temperature can be controlled at 200 ℃, and the PP melting temperature can be controlled at 170 ℃.
The stretching comprises the steps of firstly longitudinally stretching the membrane obtained by coextrusion for 1.5-2 times and then transversely stretching for 1.5-2 times.
In the longitudinal stretching and the transverse stretching, the resin film is deformed with the stretching, but is not deformed as particles with the stretching, because a large number of cells of different sizes are formed around the particles to achieve the diffuse reflection effect.
The thickness of the shading reflection film is 0.05-0.25 mm. Wherein the thickness of the reflecting surface is 0.025-0.125 mm, and the thickness of the light shielding surface is 0.025-0.125 mm.
A backlight module comprising the light-shielding reflective film of claim 1.
A method for manufacturing a backlight module comprising a light-shielding reflective film, wherein the light-shielding reflective film is manufactured by the method of claim 6.
Compared with the prior art, the invention has the following advantages:
(1) The invention can be used for solving the light leakage problem of a thin reflecting film/sheet, and provides the light shielding reflecting film with high light shielding and reflecting effects, which is prepared by one-time coextrusion of a reflecting material and a light shielding material, and has the advantages of simple forming process, low cost, short construction period and suitability for large-scale production, and the light shielding reflecting film has a double-sided structure, and the film thickness can be controlled to be 0.05-0.25 mm.
(2) The co-extrusion process of the present invention can realize the thickness adjustment of the reflecting layer and the shading layer to obtain films with different reflecting effects. For example, in the practical application process, the thickness and the layer number of each layer of the reflecting layer and the shading layer can be adjusted at will according to the requirements of customers, so as to meet different application scenes.
(3) The invention adopts the homogenized reflective material as one of the raw materials, has good molding effect of the co-extrusion process, and can achieve better dimensional stability and weather resistance of the co-extrusion product.
(4) In the co-extrusion process, the invention can achieve high-quality optical property performance by adjusting a proper temperature range, and the problems of yellowing color cast or poor crystal melting and the like of raw materials are easily caused due to the excessively high or excessively low temperature, thereby influencing the hue and the transmittance of a finished product.
(5) In the invention, the selection of the light shielding material and the reflecting material is also one of the keys influencing the effect of the finished product in the co-extrusion process, for example, when the light shielding material and the reflecting material are selected from the same materials, the finished product is not easy to deform due to the same material shrinkage rate, and the finished product is not easy to warp and deform after the high-temperature high-humidity reliability test, so that the molding effect and the weather resistance of the finished product are improved.
(6) The invention can further utilize the roller surface to manufacture an irregular embossing structure on the surface (shading surface) of the shading reflecting film in the coextrusion process, and directly manufacture the surface characteristics of the shading layer with irregular depth in the extrusion process, for example, the concave-convex structure with the height difference within 100um is formed on the surface of the film, and the height average value is required to be greater than 1/2 of the highest and lowest height differences, so as to be beneficial to reducing electrostatic adsorption between adjacent materials and avoiding fingerprints or slight scratches of assembly staff.
(7) The invention forms a multi-layer reflecting layer by utilizing the coextrusion process, forms the diffuse reflection of a finished product by utilizing the hole density generated by the reflecting material (the higher the hole density is, the more the diffuse reflection times can be formed), and simultaneously adjusts the thickness of the shading material by utilizing the coextrusion process and the stretch forming process so as to meet different application scenes, thereby obtaining the shading reflecting film with high shading effect and high reflectivity, and the shading reflecting film meets the effects that the light transmittance is below 0.1 percent and the reflectivity is above 90 percent.
(8) The shading reflection film is suitable for backlight modules of liquid crystal or light guide keyboards, has V0 flame-proof grade and meets the safety specification requirements of terminal brand customers.
Drawings
Fig. 1 is a conventional thin film reflection sheet obtained by coating or coating.
Fig. 2 shows a conventional film reflecting sheet obtained by lamination.
FIG. 3 shows a double-layer light-shielding reflective film obtained by coextrusion according to the present invention.
Fig. 4 is a multilayer light-shielding reflective film obtained by coextrusion 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 noted that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed, and unless otherwise indicated, 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 light leakage caused by light transmission of the thin reflective sheet, the known method adopts an additional process and a material mode to reduce the light transmission of the reflective sheet, so that the defects of complex processing procedure, long processing time and high cost of the reflective sheet are caused. For example, the thin film reflector (the upper layer is made of a reflective material and the lower layer is made of a light-shielding material) shown in fig. 1 is coated or coated to form the light-shielding material on the reflective material, or the thin reflector (the upper layer is made of a reflective material, the middle layer is an adhesive layer and the lower layer is made of a light-shielding material) shown in fig. 2 is bonded to form the light-shielding material on the reflective material, and when the thin film reflector is prepared, the thin film can be prepared by an additional process, so that the defects of complex processing procedure, long working time and high cost are caused, and the improvement of the production efficiency of enterprises and the mass production are not facilitated. In order to solve the problems, the invention provides a novel preparation method of a shading reflecting film, wherein the shading reflecting film is prepared by integrally forming by technical coextrusion and stretching, so that the process of the shading reflecting film can be simplified, the production efficiency can be improved, the structure of the shading reflecting film can be reasonably controlled in the process, and the shading reflecting film which meets the requirements of customers and has high shading effect and high reflectivity can be prepared.
The following description of the invention will be given by way of example only, and the scope of the invention is not limited to the following examples.
Example 1:
the formula of the reflective material comprises: 80.0% PP, 10.0% titanium dioxide, 4.0% zinc carbonate, 3.0% flame retardant, 1.0% antioxidant, 2.0% antistatic agent.
The formula of the shading material comprises the following steps: 85.0% PP, 5.0% black masterbatch, 5.0% flame retardant, 1.0% antioxidant and 5.0% antistatic agent.
After being respectively homogenized, the reflective material and the shading material adopting the formula are sent into an extruder through a hopper according to the volume ratio of 3:2, the temperature is controlled at 170 ℃, and the film consisting of the reflective layer and the shading layer is obtained through extrusion through a double-layer extrusion die head, wherein the total thickness of the film is about 0.18mm, and the reflective layer is about 0.12mm and the shading layer is also about 0.06mm.
The film is sent to a stretching process, and the film is stretched 1.5 times longitudinally and then stretched 1.5 times transversely, so as to obtain the light-shielding reflective film (the upper layer is a reflective layer, and the lower layer is a light-shielding layer) shown in fig. 3, wherein the total thickness of the light-shielding reflective film is about 0.08mm, the reflective layer is about 0.055mm, and the light-shielding layer is also about 0.025mm.
Example 2:
the formula of the reflective material comprises: 75.7% PP, 13.3% silica, 6.0% flame retardant, 3.0% antioxidant, 2.0% antistatic agent.
The formula of the shading material comprises the following steps: 85.0% PP, 1.0% black masterbatch, 6.0% flame retardant, 3.0% antioxidant and 5.0% antistatic agent.
A 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-mentioned formulation.
Example 3:
the formula of the reflective material comprises: 60.0% PET, 13.3% barium sulfate, 20.0% zinc sulfide, 3.6% flame retardant, 1.1% antioxidant, 2.0% antistatic agent.
The formula of the shading material comprises the following steps: 88.0% PP, 0.5% black masterbatch, 5.5% flame retardant, 2.0% antioxidant and 4.0% antistatic agent.
A 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-mentioned formulation.
Example 4:
the formula of the reflective material comprises: 68.0% PMMA, 25.0% zinc oxide, 3.0% flame retardant, 1.5% antioxidant, 2.5% antistatic agent.
The formula of the shading material comprises the following steps: 89.7% PMMA, 0.3% black masterbatch, 5.0% flame retardant, 2.7% antioxidant and 3.0% antistatic agent.
Using the reflecting material and the light-shielding material of the above-mentioned formulation, a light-shielding reflecting film having the structure shown in FIG. 3 was produced in the same manner as in example 1 (at 200 ℃ C.).
Example 5:
the formula of the reflective material is as follows: 80.0% PP, 7.0% silica, 7.0% mica, 3.0% flame retardant, 1.0% antioxidant, 2.0% antistatic agent.
And a second formula of the reflecting material: 80.0% PP, 7.0% silica, 7.0% calcium carbonate, 3.0% flame retardant, 1.0% antioxidant, 2.0% antistatic agent.
The formula of the shading material comprises the following steps: 89.0% pp, 1.0% black masterbatch, 3.0% flame retardant, 2.0% antioxidant and 5.0% antistatic agent.
The reflective material and the shading material with the above formula are fed into an extruder through a hopper according to the volume ratio of 1.2:1.2:1, the temperature is controlled at 170 ℃, and the film formed by the reflective layer and the shading layer is obtained through extrusion through a three-layer extrusion die head, wherein the total thickness of the film is about 0.3mm, the reflective layer is about 0.21mm, and the shading layer is also about 0.09mm.
The film is sent into a stretching process, and the film is stretched longitudinally for 2 times and then stretched transversely for 2 times, so that the shading reflecting film (the upper two layers are reflecting layers and the lower layer is shading layers) shown in fig. 4 is obtained, wherein the total thickness of the shading reflecting film is about 0.075mm, the two reflecting layers are about 0.053mm, and one shading layer is about 0.022mm.
Example 6:
the formula of the reflective material is as follows: 66.0% PP, 10.0% magnesium carbonate, 10.0% zinc carbonate, 6.0% flame retardant, 3.0% antioxidant, 5.0% antistatic agent.
And a second formula of the reflecting material: 76.0% PP, 10.0% silica, 6.0% flame retardant, 3.0% antioxidant, 5.0% antistatic agent.
The formula of the shading material comprises the following steps: 85.0% PP, 1.0% black masterbatch, 6.0% flame retardant, 3.0% antioxidant and 5.0% antistatic agent.
A light-shielding reflective film having a structure shown in fig. 4 was produced in the same manner as in example 5 using the reflective material and the light-shielding material of the above-mentioned formulation.
Example 7:
the formula of the reflective material is as follows: 72.0% PC, 16.0% calcium carbonate, 5.0% flame retardant, 2.0% antioxidant, 5.0% antistatic agent.
And a second formula of the reflecting material: 88.0% PC, 6.0% flame retardant, 1.0% antioxidant, 5.0% antistatic agent.
The formula of the shading material comprises the following steps: 87.2% PC, 0.8% black masterbatch, 5.0% flame retardant, 2.0% antioxidant and 5.0% antistatic agent.
A light-shielding reflective film having a structure shown in fig. 4 was produced in the same manner as in example 5 using the reflective material and the light-shielding material of the above-mentioned formulation.
Example 8:
the formula of the reflective material is as follows: 77.0% PET, 16.0% silica, 4.0% flame retardant, 1.0% antioxidant, 2.0% antistatic agent.
And a second formula of the reflecting material: 90.0% PET, 6.0% flame retardant, 2.0% antioxidant, 2.0% antistatic agent.
The formula of the shading material comprises the following steps: 90.0% PET, 1.0% black masterbatch, 5.0% flame retardant, 1.0% antioxidant and 2.0% antistatic agent.
Using the reflecting material and the light-shielding material of the above-mentioned formulation, a light-shielding reflecting film having the structure shown in FIG. 4 was produced in the same manner as in example 5 (at 260 ℃ C.).
Comparative example 1:
the formula of the reflective material comprises: PET, barium sulfate and flame retardant in proper proportion.
The formula of the shading material comprises the following steps: PET, flame retardant and black master batch in proper proportion.
The reflective material and the shading material with the formula are adopted, a proper amount of the homogenized reflective material is sent into an extruder, the temperature is controlled at 260 ℃ and is extruded to obtain a reflective membrane, a proper amount of the shading material is sent into the extruder, the temperature is controlled at 260 ℃ and is extruded to obtain a shading membrane, a glue layer is attached to the reflective membrane, and then a shading layer is attached to the glue layer, so that the film reflector with the structure shown in figure 1 is prepared, the total thickness of the film reflector is about 0.155mm, wherein the reflective material is about 0.08mm, and the shading material is about 0.075mm.
The flame retardant, antioxidant and antistatic agent for the reflective material and the light shielding material in examples 1 to 8 and comparative example 1 are not particularly limited, and may be conventionally selected according to the product requirements in practical use. Of course, the components selected for the flame retardant, antioxidant and antistatic agent in the examples and comparative document 1 were the same in the following test procedure of the present invention.
The light-shielding reflective films of examples 1 to 8 and comparative example 1 were subjected to light transmittance and reflectance tests as shown in table 1 below. The light transmittance test method employs known devices such as: ASTMD 1003 and NDH7000-2, reflectance testing methods used known equipment ASTM E2177 and UH4150 spectrophotometers.
TABLE 1
As is clear from the above table, the light-shielding reflective films prepared by coextrusion in examples 1 to 8 do not directly affect the reflectance as compared with the thin film reflective sheet of comparative example 1, and can also be prepared into products having a high light-shielding effect and a high reflectance. In addition, from the viewpoint of the preparation process, the co-extrusion process adopted in examples 1 to 8 is simpler than that of comparative example 1, is convenient for large-scale production, and is beneficial to improving the production efficiency. In addition, the light-shielding reflective films of examples 1 to 8 lack an adhesive layer from the viewpoint of product thickness, and therefore are thinner than the thin film reflective sheet of comparative example 1, and can also satisfy the user demand for light and thin backlight modules.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.

Claims (6)

1. A shading reflecting film capable of improving shading effect and reflectivity is characterized in that: respectively feeding the homogenized reflecting material and shading material into an extruder, co-extruding, stretching and shaping to obtain the shading reflecting film with a double-sided structure,
the thickness of the shading and reflecting film is 0.05-0.25 mm, one surface of the shading and reflecting film is a reflecting surface, and the other surface of the shading and reflecting film is a shading surface;
the reflective material comprises the following components in percentage by weight: 60-90% of optically 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, wherein the inorganic filler is at least one of calcium carbonate, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, zinc sulfide, calcium phosphate, silicon dioxide, aluminum oxide, mica titanium, talcum, clay, kaolin, lithium fluoride and calcium fluoride;
the shading material comprises the following components in percentage by weight: 60 to 90 percent of resin, 0.3 to 1 percent of black master batch, 3 to 6 percent of flame retardant, 1 to 3.0 percent of antioxidant and 2 to 5 percent of antistatic agent;
the stretching comprises the steps of firstly longitudinally stretching the membrane obtained by coextrusion for 1.5-2 times and then transversely stretching for 1.5-2 times.
2. A light-shielding reflective film according to claim 1, wherein: the reflecting surface comprises at least one reflecting layer made of reflecting materials; the light shielding surface includes at least one light shielding layer made of a light shielding material.
3. A light-shielding reflective film according to claim 1, wherein: the optically transparent resin is at least one selected from polypropylene resin, polyethylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polybutylene terephthalate and polycarbonate.
4. A light-shielding reflective 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.
5. A backlight module is characterized in that: a light-shielding reflective film as defined in claim 1.
6. A preparation method of a backlight module is characterized in that: a light-shielding reflective film as defined in claim 1.
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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
CN102729552A (en) * 2012-06-21 2012-10-17 绵阳龙华薄膜有限公司 Black and white film
KR20130118503A (en) * 2012-04-20 2013-10-30 (주)에이나노 Reflection sheet for back light unit
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

Patent Citations (7)

* 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
KR20130118503A (en) * 2012-04-20 2013-10-30 (주)에이나노 Reflection sheet for back light unit
CN102729552A (en) * 2012-06-21 2012-10-17 绵阳龙华薄膜有限公司 Black and white film
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
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