CN106908863A - A kind of optical reflectance coating and preparation method thereof - Google Patents
A kind of optical reflectance coating and preparation method thereof Download PDFInfo
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- CN106908863A CN106908863A CN201610222040.XA CN201610222040A CN106908863A CN 106908863 A CN106908863 A CN 106908863A CN 201610222040 A CN201610222040 A CN 201610222040A CN 106908863 A CN106908863 A CN 106908863A
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- 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
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- 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
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- 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
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- C08L23/12—Polypropene
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- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
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- G02B5/0808—Mirrors having a single reflecting layer
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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
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Abstract
The present invention relates to reflectance coating field, and in particular to a kind of optical reflectance coating suitable for short OD backlight modules and preparation method thereof.In order to solve the problems, such as existing reflectance coating be applied to short OD backlight modules in even photosensitiveness it is poor, the invention provides a kind of optical reflectance coating and preparation method thereof.The reflectance coating includes main stor(e)y (B layers) and the auxiliary layer (A layers) being arranged on the main stor(e)y；(A layers) of the auxiliary layer includes following components：Polyester resin 86.5 93%, the SiO of small particle2Particle 0.1 5%, the inorganic particulate 0.5 2% of big particle diameter, antistatic additive 5 10%, the percentage composition is weight/mass percentage composition；The SiO of the small particle2Average grain diameter be 24 μm, the average grain diameter of the inorganic particulate of the big particle diameter is 5 15 μm.After the reflectance coating is applied to short OD backlight modules, can effectively improve the even light effect in backlight module, lamp, shadow phenomenon will not be produced.
Description
Technical field
The present invention relates to reflectance coating field, and in particular to a kind of optical reflectance coating and its system suitable for short OD backlight modules
Preparation Method.
Background technology
Flat panel display mainly includes that liquid crystal display (LCD), plasma show (PDP), digital light display back projection TV
(DLP), reflection type projection shows (LCOS), ORGANIC ELECTROLUMINESCENCE DISPLAYS (OLED) and SED
(SED) tv product of multiple technologies type, wherein LCDs LCD (Liquid Crystal Display), because of tool such as
Have under thin, planar, lightweight, low power consumption, low-voltage work, the series of advantages such as radiationless, will be as in the long period from now on
FPD mainstream technology.LED-backlit module is divided into side entering type and the class of straight-down negative two according to the position of light source.Wherein side entering type is carried on the back
Light die set light source is in side, the advantage with module thinner thickness；And down straight aphototropism mode set light source is below.
In backlight module, reflectance coating can be reflected back the light for spilling, and improve the utilization rate of light.Side entrance back mould
Group has advantageous thinness, but the light guide plate for playing guide-lighting effect is close to reflectance coating, because of absorption shadow etc. may be caused bad existing
The problems such as being likely to produce scratch, push up white as, the reflectance coating after coating, therefore, technically it is less susceptible to respect to direct-type backlight
Realize.In direct-type backlight, light source below, is more likely formed uniform picture.It is increasing straight with the development in market
Type backlight module reduces overall thickness, that is, reduce light source the distance between to diffuser plate, and usual this segment distance is referred to as
OD (Optical Distance) distance.Such as, OD distances are 20-30mm in traditional down straight aphototropism mode set, and existing market
On the OD distances of short OD backlight modules be 15-18mm, or even have the down straight aphototropism mode set of 12mm.Traditional reflectance coating is used for
Easily there is lamp, surrounding shadow phenomenon after the short OD backlight modules, also be difficult to be formed even if covering two diffusion barriers and carrying out even light
Uniform picture.And this uneven picture phenomenon is in a backlight not allow appearance.
As the countermeasure for solving non-uniform phenomenon in short OD backlight modules, also in reflectance coating surface coating diffusion particle
Mode, but, it is this to be coated with the technique process that increased reflectance coating, take time and effort.
The content of the invention
In order to solve the problems, such as existing reflectance coating be applied to short OD backlight modules in even photosensitiveness it is poor, the invention provides one
Plant optical reflectance coating and preparation method thereof.The reflectance coating has excellent diffusing reflection effect, after being applied to short OD backlight modules, energy
Enough effective even light effects for improving reflectance coating in backlight module, even photosensitiveness is good, and lamp shadow, corner shadow will not be produced to show
As.The present invention pass through in the A of reflectance coating layer addition two kinds of particle diameters of size inorganic fill particle, obtain A layer surfaces contain it is poly-
The reflectance coating of the sized particles projection of ester cladding.The reflectance coating that the present invention is provided is one-time formed, its preparation method technique letter
It is single.
In order to solve the above-mentioned technical problem, the present invention uses following technical proposals：
The present invention provides a kind of reflectance coating, and the reflectance coating includes main stor(e)y (B layers) and the auxiliary layer (A being arranged on the main stor(e)y
Layer)；
The main stor(e)y includes following components：Polyester resin 72-82%, incompatible resin 10-13%, white inorganic filling grain
Sub- 8-15%；The average grain diameter of the white inorganic particle filled composite is 0.1-0.4 μm；The percentage composition is that quality percentage contains
Amount；
(A layers) of the auxiliary layer includes following components：Polyester resin 86.5-93%, the SiO of small particle2Particle 0.1-5%,
Inorganic particulate 0.5-2%, the antistatic additive 5-10% of big particle diameter, the percentage composition is weight/mass percentage composition；The small particle
SiO2The average grain diameter of particle is 2-4 μm, and the average grain diameter of the inorganic particulate of the big particle diameter is 5-15 μm.
Further, the average grain diameter of the white inorganic particle filled composite is 0.2-0.4 μm.
60 ° of surface glosses of above-mentioned reflectance coating are 10-20%.Further, 60 ° of surface glosses of above-mentioned reflectance coating are
10-17%.Above-mentioned reflectance coating is applied to short OD backlight modules.
Further, the reflectance coating includes ABA three-deckers or AB double-layer structures.
Further, the reflectance coating is ABA three-deckers or AB double-layer structures.
Further, the reflecting film structure is ABA three-deckers, wherein, one A layers of thickness accounts for reflectance coating gross thickness
4-10%, B layers of thickness accounts for the 80-92% of reflectance coating gross thickness.Further, one A layers of thickness accounts for reflectance coating total thickness
The 4.7-5.8% of degree.
Further, the reflectance coating gross thickness is 100-300 μm.Further, the reflectance coating gross thickness is 188-
191μm。
There is micropore in the main stor(e)y (B layers).(A layers) of auxiliary layer is free of foam structure.Incompatible resin is hole formation
Matter, can form hole in main stor(e)y.
B layers of Main Function is reflection light, and A layers of effect is to form low-luster by the bulge-structure of size height
Surface, realize excellent diffusing reflection effect.
The polyester resin is selected from the one kind in the polyester formed by dicarboxylic acids composition and glycol component.Further
, such as terephthalic acid (TPA), M-phthalic acid, NDA, 4,4 '-biphenyl dicarboxylic acid, adipic acid, certain herbaceous plants with big flowers can be included
The dicarboxylic acids composition of diacid.As glycol component, such as ethylene glycol, BDO, Isosorbide-5-Nitrae-hexamethylene two can be enumerated
Methyl alcohol, 1,6-HD.Further, the polyester resin optimization aromatic polyester.
Further, the preferred polyethylene terephthalate of the polyester resin (PET), polybutylene terephthalate
Ester (PBT) or PEN (PEN).
In main stor(e)y, the white inorganic particle filled composite, selected from titanium dioxide.Further, the grain of titanium dioxide particle filled composite
Footpath is preferably 0.2-0.4 μm.The inorganic particulate of the average grain diameter of the scope, dispersion that can be appropriate will not be produced in the polyester
The cohesion of particle, also, inorganic particulate can be arbitrary shape, for example, inorganic particulate can be tabular or spherical.To inorganic
Particle can be surface-treated, to improve the dispersiveness of inorganic particulate.
Described incompatible resin refers to the resin incompatible with polyester resin.Incompatible resin is selected from vistanex
One kind, such as the one kind in acrylic resin (abbreviation polypropylene) or poly- 4- methylpentenes.Incompatible resin and polyester resin
In the drawing process of draw ratio high, foam structure is formd in main stor(e)y structure, light can produce folding by the interface of hole
Penetrate, the white reflection film excellent so as to obtain reflectivity.
Further, the micropore in B layers is ellipsoid, and the major diameter of abscess is 0.1-1 μm, and the density of abscess is 10000-
100000/cm3。
Further, the SiO containing 0.1-5% in the auxiliary layer2If, SiO2Addition is excessive, then the film forming of reflectance coating has
It is difficult.Further, SiO2Content be preferably 2%.
In the auxiliary layer, the inorganic particulate of the big particle diameter is selected from the one kind in calcium oxide, barium sulfate or talcum powder.Enter
One step, the inorganic particulate of the big particle diameter is preferably talcum powder.
Further, the average grain diameter of talcum powder is preferably 6.5-10 μm.If talcum powder particle diameter is excessive, reflectance coating into
Film is had any problem, if too small, is not enough to form suitable projection, the diffusing reflection effect not having.Further, talcum powder warp
Cross modified.Surface is carried out to talcum powder surface with surface modifier to be modified, and improves its dispersiveness in polymer matrix with parent
And property.
Further, in A layers of the reflectance coating, the SiO of small particle2Particle, and the inorganic particulate of particle diameter greatly is anti-
The surface for penetrating film A layers forms raised particle.
Further, the height of the raised particle of reflectance coating A layer surfaces is 2-10 μm.
Further, in described reflectance coating, (A layers) of the auxiliary layer includes following components：Polyester resin 86.5-
90%, the SiO of small particle2Particle 0.1-5%, the inorganic particulate 0.5-2% of big particle diameter, antistatic additive 6-8%, the percentage contains
Amount is weight/mass percentage composition；The SiO of the small particle2Average grain diameter be 2-4 μm, the inorganic particulate of the big particle diameter it is average
Particle diameter is 6.5-10 μm.Numerical value in aforementioned value scope correspondence embodiment 1-12.
Further, in described reflectance coating, the main stor(e)y includes following components：Polyester resin 72-80%, it is incompatible
Resin 10-13%, white inorganic particle filled composite 10-15%；The average grain diameter of the white inorganic particle filled composite is 0.2-0.4 μ
m；The percentage composition is weight/mass percentage composition；
(A layers) of the auxiliary layer includes following components：Polyester resin 86.5-90%, the SiO of small particle2Particle 0.1-5%,
Inorganic particulate 0.5-2%, the antistatic additive 6-8% of big particle diameter, the percentage composition is weight/mass percentage composition；The small particle
SiO2Average grain diameter be 2-4 μm, the average grain diameter of the inorganic particulate of the big particle diameter is 6.5-10 μm.Aforementioned value scope pair
Answer embodiment 2-3,5-6,8-9,11-12.
Further, in the reflectance coating, the main stor(e)y includes following components：Polyester resin 72%, incompatible resin
13%, white inorganic particle filled composite 15%；The average grain diameter of the white inorganic particle filled composite is 0.2-0.4 μm；The percentage
Content is weight/mass percentage composition；(A layers) of the auxiliary layer includes following components：Polyester resin 89%, the SiO of small particle2Particle
4%, the inorganic particulate 1% of big particle diameter, antistatic additive 8%, the percentage composition is weight/mass percentage composition；The small particle
SiO2The average grain diameter of particle is 2-4 μm, and the average grain diameter of the inorganic particulate of the big particle diameter is 6.5-10 μm.
Further, in described reflectance coating, in main stor(e)y, the incompatible resin is acrylic resin；White nothing
Machine particle filled composite is TiO2。
Further, in described reflectance coating, in auxiliary layer, the inorganic particulate of the big particle diameter is talcum powder.
Further, in described reflectance coating, in auxiliary layer, the antistatic additive is selected from ethoxylated alkylamine.
Antistatic additive can reduce the absorption problem that straight-down negative face cuts the useless film in middle hole.
Further, in described reflectance coating, the polyester resin is selected from polyethylene terephthalate.
The present invention also provides a kind of backlight module, and the reflectance coating used in the backlight module is reflection of the present invention
Film；OD values in the backlight module are 12-18 μm.
The present invention also provides a kind of preparation method of described reflectance coating, and methods described comprises the steps：
(1) the A layers of SiO of small particle used2Particle (containing silicon original material), the inorganic particulate of big particle diameter and antistatic agent functional master batches are carried
Preceding mixing, with polyester resin as carrier, is sufficiently mixed in addition kneading machine, obtains raw mixture；
(2) B layers of raw material are weighed by formula, is extruded through double screw extruder after drying, mixing device, A layers of raw material
Through single screw extrusion machine melting extrusion, A layers of raw material and B layers of raw material are extruded at die head with main stor(e)y and auxiliary layer co-cast, cooling
Slab, by longitudinal stretching, cross directional stretch, thermal finalization treatment forms reflectance coating.
Compared with existing reflectance coating, after the optical reflectance coating that the present invention is provided is applied to short OD backlight modules, can be effective
Improve the even photosensitiveness (or optical uniformity) of short OD backlights, can effectively reduce shadow phenomenon.The reflectance coating one that the present invention is provided
Secondary shaping, process is simple, it is easy to operate, it is to avoid follow-up numerous and diverse painting process, reflectance coating A layer surfaces by wrapped in polyester
Height particle projection can provide effective diffusing reflection so that the even light effect that short OD backlights are obtained.It is anti-that the present invention is provided
Film is penetrated, short OD backlight modules can be widely used in.
Brief description of the drawings
The structural representation of the reflectance coating that Fig. 1 is provided for the present invention.
Specific embodiment
For the functional character and advantage that are more readily understood structure of the invention and to be reached, hereafter will be of the invention preferable
Embodiment, and coordinate schema to be described below in detail：
As shown in figure 1, the present invention provides a kind of reflectance coating suitable for short OD backlight modules, the reflectance coating includes reflection
Film main stor(e)y 1 and the auxiliary layer 2 being arranged on the main stor(e)y；Contain micropore 11 and inorganic particulate 12 in the main stor(e)y 1 (can be described as B layers)；
The effect of the main stor(e)y is mainly reflection light；The auxiliary layer 2 (can be described as A layers) includes the SiO compared with small particle2Particle 21 and compared with
The inorganic particulate 22 of big particle diameter.
The reflectance coating suitable for short OD backlight modules that the present invention is provided, properties are detected using following methods.
1st, the thickness of each layer
Prepared S-4700 field emission scanning electron microscopes are made using FDAC, with 500 times of observation films of multiplying power
Section, the thickness of each layer of reflectance coating is obtained to determine 5 points of average value.
2nd, reflectance coating surface gloss
The glossiness on made reflectance coating surface is measured using the type Grossmeters of ZGM 1020 (production of Jie Ener companies of Switzerland),
5 average values in region of record, in this, as the glossiness of the reflectance coating.Glossiness is lower, and explanation diffusing reflection effect is better, this
The glossiness for inventing the reflectance coating for providing is less than 20%.
3rd, the uniformity (or optical uniformity, also referred to as even photosensitiveness) of backlight module (OD=18mm)
Each reflectance coating obtained in embodiment is placed in backlight module after being cut by backlight module drawing, assembles backlight
After module, backlight is lighted, whether subjective observation backlight module has intermediate lamp, the phenomenon of surrounding shadow:
○：Backlight is without lamp, without surrounding shadow phenomenon, and optical uniformity is best；
△：Backlight, surrounding shadow phenomenon are slighter, and optical uniformity is preferable；
×：Backlight is obvious, surrounding shadow is heavier, and optical uniformity is poor.
4th, draftability (or being filming performance)
Reflectance coating in embodiment, what can observation stablize during molding is filmed, and is commented based on following some benchmark
Valency.Should illustrate, longitudinal direction is the continuous masking direction of film, be laterally direction normal thereto.
A:Can stably masking more than 2 hours；
B:Can stably masking 1 hour less than 2 hours；
C:Rupture of membranes is produced during less than 1 hour, it is impossible to the masking of stabilization.
5th, backlight module (OD=18mm) brightness (also referred to as briliancy)
After each reflectance coating obtained in embodiment cuts according to the reflectance coating drawing of backlight module, by the hair of backlight unit
Smooth surface is divided into 3 × 39 areas, is measured for the front face brightness after lighting 1 hour using Fu Shida BM-7A luminance meters, surveys
It is 1 ° to determine angle, and luminance meter is 50cm with the distance of backlight front light-emitting area.9 arithmetic mean of instantaneous values of regional luminance are tried to achieve to make
It is applied to the brightness value of backlight for the reflectance coating.
The structure of the reflectance coating that embodiment and comparative example are provided is ABA three-deckers, and the thickness of each layer is as shown in table 2.
Embodiment 1
The reflectance coating that the present invention is provided, including reflectance coating main stor(e)y and the auxiliary layer being arranged on the main stor(e)y.Reflectance coating main stor(e)y bag
Contain the TiO that weight/mass percentage composition is 8%2, TiO2The average grain diameter of particle is 0.2 μm；Weight/mass percentage composition is poly- the third of 13%
Olefine resin (Borealis (Borealis) produces, and product type is WF420HMS), 79% PET polyester resin (Chinese Yizheng
The PET film grade pet chip of chemical fibre Co., Ltd production, product designation FG600)；The auxiliary layer of reflectance coating includes weight/mass percentage composition
It is the SiO that 1%, average grain diameter is 4 μm2, weight/mass percentage composition is the talcum powder that 1%, average grain diameter is 10 μm, antistatic additive
The content of (plastic anti-static agent that Ningbo masterbatch Co., Ltd provides) is 8%, 90% PET polyester resin (Chinese Yizheng
The PET film grade pet chip of chemical fibre Co., Ltd production, product designation FG600).The raw material of auxiliary layer is sufficiently mixed by formula through mixing
After obtain raw mixture, after the raw material of auxiliary layer and main stor(e)y are through drying, mixing device, respectively through single screw extrusion machine, double spiral shells
Bar extruder melting mixing, main stor(e)y and auxiliary layer co-cast are extruded at die head, cool down slab, then by longitudinal stretching, transverse direction
Stretching, thermal finalization treatment, forms reflectance coating.Evaluation result is summarized in table 2.
Embodiment 2
The reflectance coating that such as embodiment 1 is provided, wherein, TiO in main stor(e)y2Percentage composition be for the percentage composition of 10%, PET
77%；The percentage composition of talcum powder is that the percentage composition of 1.5%, PET is 89.5% in auxiliary layer.Evaluation result is summarized in table 2.
Embodiment 3
The reflectance coating that such as embodiment 1 is provided, wherein, TiO in main stor(e)y2Percentage composition be for the percentage composition of 15%, PET
72%；SiO in auxiliary layer2Percentage composition for 2%, PET percentage composition be 89%.Evaluation result is summarized in table 2.
Embodiment 4
The reflectance coating that the present invention is provided, including reflectance coating main stor(e)y and the auxiliary layer being arranged on the main stor(e)y.Reflectance coating main stor(e)y bag
Contain the TiO that weight/mass percentage composition is 8%2, TiO2The average grain diameter of particle is 0.4 μm；Weight/mass percentage composition is poly- the third of 10%
Olefine resin (Borealis (Borealis) produces, and product type is WF420HMS), 82% PET polyester resin (Chinese Yizheng
The PET film grade pet chip of chemical fibre Co., Ltd production, product designation FG600)；The auxiliary layer of reflectance coating includes weight/mass percentage composition
It is the SiO that 2%, average grain diameter is 4 μm2Particle, weight/mass percentage composition is the talcum powder that 1.5%, average grain diameter is 10 μm, is resisted quiet
The content of electric agent (plastic anti-static agent that Ningbo masterbatch Co., Ltd provides) is 8%, 88.5% PET polyester resin (in
The PET film grade pet chip of Yizheng Fiber Optical plant Co., Ltd of state production, product designation FG600).The raw material of auxiliary layer is filled by formula through mixing
Divide and raw mixture is obtained after mixing, after the raw material of auxiliary layer and main stor(e)y are through drying, mixing device, respectively through Single screw extrusion
Machine, double screw extruder melting mixing, main stor(e)y and auxiliary layer co-cast are extruded at die head, cool down slab, then draw by longitudinal direction
Stretch, cross directional stretch, thermal finalization treatment, formed reflectance coating.Evaluation result is summarized in table 2.
Embodiment 5
The reflectance coating that the present invention is provided, including reflectance coating main stor(e)y and the auxiliary layer being arranged on the main stor(e)y.Reflectance coating main stor(e)y bag
Contain the TiO that weight/mass percentage composition is 10%2, TiO2The average grain diameter of particle is 0.4 μm；Weight/mass percentage composition be 10% it is poly-
Allyl resin (Borealis (Borealis) produces, and product type is WF420HMS), 80% PET polyester resin (Chinese instrument
Levy the PET film grade pet chip of chemical fibre Co., Ltd production, product designation FG600)；The auxiliary layer of reflectance coating includes quality percentage and contains
Measure as SiO that 0.1%, average grain diameter is 2 μm2Particle, weight/mass percentage composition is the talcum powder that 2%, average grain diameter is 10 μm, is resisted
The content of electrostatic agent (plastic anti-static agent that Ningbo masterbatch Co., Ltd provides) is 8%, 89.9% PET polyester resin
(the PET film grade pet chip of Chinese Yizheng Fiber Optical plant Co., Ltd production, product designation FG600).The raw material of auxiliary layer is by formula through mixed
Refine and raw mixture is obtained after being sufficiently mixed, after the raw material of auxiliary layer and main stor(e)y are through drying, mixing device, squeezed through single screw rod respectively
Go out machine, double screw extruder melting mixing, main stor(e)y and auxiliary layer co-cast are extruded at die head, cool down slab, then by longitudinal direction
Stretching, cross directional stretch, thermal finalization treatment, form reflectance coating.Evaluation result is summarized in table 2.
Embodiment 6
The reflectance coating that the present invention is provided, including main stor(e)y and the auxiliary layer being arranged on the main stor(e)y.Reflectance coating main stor(e)y includes matter
Amount percentage composition is 15% TiO2, TiO2The average grain diameter of particle is 0.4 μm；Weight/mass percentage composition is 10% polypropylene tree
Fat (Borealis (Borealis) produces, and product type is WF420HMS), 75% PET polyester resin (Chinese Yizheng Fiber Optical plant
The PET film grade pet chip of Co., Ltd's production, product designation FG600)；The auxiliary layer of reflectance coating includes weight/mass percentage composition and is
5%th, average grain diameter is 2 μm of SiO2Particle, weight/mass percentage composition is the talcum powder that 0.5%, average grain diameter is 10 μm, antistatic
The content of agent (plastic anti-static agent that Ningbo masterbatch Co., Ltd provides) is 8%, 86.5% PET polyester resin (China
The PET film grade pet chip of Yizheng Fiber Optical plant Co., Ltd production, product designation FG600).The raw material of auxiliary layer is abundant through mixing by formula
Obtain raw mixture after mixing, after the raw material of auxiliary layer and main stor(e)y are through drying, mixing device, respectively through single screw extrusion machine,
Double screw extruder melting mixing, main stor(e)y and auxiliary layer co-cast are extruded at die head, cool down slab, then by longitudinal stretching,
Cross directional stretch, thermal finalization treatment, forms reflectance coating.Evaluation result is summarized in table 2.
Embodiment 7
The reflectance coating that such as embodiment 1 is provided, wherein, the average grain diameter of talcum powder is 6.5 μm in auxiliary layer.Evaluation result is summarized
In table 2.
Embodiment 8
The reflectance coating that such as embodiment 2 is provided, wherein, the average grain diameter of talcum powder is 6.5 μm in auxiliary layer.Evaluation result is summarized
In table 2.
Embodiment 9
The reflectance coating that such as embodiment 3 is provided, wherein, the average grain diameter of talcum powder is 6.5 μm in auxiliary layer.Evaluation result is summarized
In table 2.
Embodiment 10
The reflectance coating that such as embodiment 4 is provided, wherein, the average grain diameter of talcum powder is 6.5 μm in auxiliary layer.Evaluation result is summarized
In table 2.
Embodiment 11
The reflectance coating that such as embodiment 5 is provided, wherein, the average grain diameter of talcum powder is 6.5 μm in auxiliary layer.Evaluation result is summarized
In table 2.
Embodiment 12
Such as the reflectance coating that embodiment 6 is provided, wherein, the average grain diameter of talcum powder is 6.5 μm in auxiliary layer, and antistatic additive contains
Measure be 6%, PET polyester resin content be 88.5%.Evaluation result is summarized in table 2.
Embodiment 13
The reflectance coating that such as embodiment 1 is provided, wherein, TiO in main stor(e)y2Average grain diameter be 0.1 μm；Big particle diameter in auxiliary layer
Inorganic particulate is calcium oxide particle, and the average grain diameter of calcium oxide particle is 5 μm, and the content of antistatic additive is the percentage of 5%, PET
Content is 93%.Evaluation result is summarized in table 2.
Embodiment 14
The reflectance coating that such as embodiment 1 is provided, wherein, TiO in main stor(e)y2Average grain diameter be 0.2 μm；Talcum powder in auxiliary layer
Average grain diameter is 15 μm, and the content of antistatic additive is 88% for the percentage composition of 10%, PET.Evaluation result is summarized in table 2.
Comparative example 1
The reflectance coating that such as embodiment 1 is provided, wherein, SiO in auxiliary layer2Content be 0, the weight/mass percentage composition of talcum powder is
The weight/mass percentage composition of 0.1%, PET is 91.9%.In comparative example 1, SiO is free of in auxiliary layer2Particle, the content mistake of talcum powder
Low, evaluation result is summarized in table 2.
Comparative example 2
The reflectance coating that such as embodiment 2 is provided, wherein, SiO in auxiliary layer2Percentage composition be 8%, the percentage composition of talcum powder
It is 3%, the average grain diameter of talcum powder is 6.5 μm, the percentage composition of PET is 81%.In comparative example 1, SiO in auxiliary layer2Particle
Too high levels, evaluation result is summarized in table 2.
Comparative example 3
The reflectance coating that such as embodiment 1 is provided, wherein, the TiO in main stor(e)y2Percentage composition be 5%, polyacrylic content is
The percentage composition of 13%, PET is 82%.In comparative example 3, TiO in main stor(e)y2The percentage composition of particle is too low, and evaluation result is summarized
In table 2.
Comparative example 4
The reflectance coating that such as embodiment 2 is provided, wherein, TiO in main stor(e)y2Percentage composition be 8%, TiO2Average grain diameter be
0.4 μm, the percentage composition of acrylic resin is 87% for the percentage composition of 5%, PET.In comparative example 4, polypropylene number in main stor(e)y
The percentage composition of fat is too low, and the too high levels of PET, evaluation result is summarized in table 2.
The composition composition of the reflectance coating that the embodiment of table 1 is provided with comparative example
The performance test results of the reflectance coating that the embodiment of table 2 is provided with comparative example
Testing result as shown in Table 2 can show that the reflectance coating that the present invention is provided is applied in short OD backlight modules,
The picture of uniformity can be provided, shadow phenomenon is prevented, and show with relatively good brightness.Wherein, embodiment 2-3,
The reflectance coating that 5-6,8-9,11-12 are provided has preferable combination property, and brightness is more than or equal to 2280cd/m2.Particularly, it is real
The reflectance coating for applying example 3 and the offer of embodiment 9 has more preferable combination property.
The above, only presently preferred embodiments of the present invention is not intended to limit the scope of the present invention.It is every
The impartial change done according to present invention and modification, are encompassed by the scope of the claims of the invention.
Claims (10)
1. a kind of reflectance coating, it is characterised in that the reflectance coating includes main stor(e)y and the auxiliary layer being arranged on the main stor(e)y；The main stor(e)y
Including following components：Polyester resin 72-82%, incompatible resin 10-13%, white inorganic particle filled composite 8-15%；It is described white
The average grain diameter of color inorganic fill particle is 0.1-0.4 μm；The percentage composition is weight/mass percentage composition；
The auxiliary layer includes following components：Polyester resin 86.5-93%, the SiO of small particle2Particle 0.1-5%, the nothing of big particle diameter
Machine particle 0.5-2%, antistatic additive 5-10%, the percentage composition is weight/mass percentage composition；The SiO of the small particle2Particle
Average grain diameter be 2-4 μm, the average grain diameter of the inorganic particulate of the big particle diameter is 5-15 μm.
2. reflectance coating according to claim 1, it is characterised in that the reflectance coating is ABA three-deckers or AB two-layer knots
Structure.
3. reflectance coating according to claim 1, it is characterised in that the auxiliary layer includes following components：Polyester resin 86.5-
90%, the SiO of small particle2Particle 0.1-5%, the inorganic particulate 0.5-2% of big particle diameter, antistatic additive 6-8%, the percentage contains
Amount is weight/mass percentage composition；The SiO of the small particle2Average grain diameter be 2-4 μm, the inorganic particulate of the big particle diameter it is average
Particle diameter is 6.5-10 μm.
4. reflectance coating according to claim 1, it is characterised in that the main stor(e)y includes following components：Polyester resin 72-
80%, incompatible resin 10-13%, white inorganic particle filled composite 10-15%；The average grain diameter of the white inorganic particle filled composite
It is 0.2-0.4 μm；The percentage composition is weight/mass percentage composition；
The auxiliary layer includes following components：Polyester resin 86.5-90%, the SiO of small particle2Particle 0.1-5%, the nothing of big particle diameter
Machine particle 0.5-2%, antistatic additive 6-8%, the percentage composition is weight/mass percentage composition；The SiO of the small particle2It is average
Particle diameter is 2-4 μm, and the average grain diameter of the inorganic particulate of the big particle diameter is 6.5-10 μm.
5. reflectance coating according to claim 1, it is characterised in that in main stor(e)y, the incompatible resin is polypropylene tree
Fat；White inorganic particle filled composite is TiO2。
6. reflectance coating according to claim 1, it is characterised in that in auxiliary layer, the big particle diameter inorganic particle is talcum
Powder.
7. reflectance coating according to claim 1, it is characterised in that in auxiliary layer, the antistatic additive is selected from ethoxylation
Alkylamine.
8. reflectance coating according to claim 1, it is characterised in that the polyester resin is selected from polyethylene terephthalate
Ester.
9. a kind of backlight module, it is characterised in that the reflectance coating used in the backlight module is that one of claim 1-8 is described
Reflectance coating；OD values in the backlight module are 12-18 μm.
10. a kind of preparation method of the reflectance coating according to one of claim 1-8, it is characterised in that methods described includes
Following step：
(1) the A layers of SiO of small particle used2Particle, the inorganic particulate of big particle diameter and antistatic agent functional master batches mix in advance, with polyester tree
Fat is carrier, is sufficiently mixed in addition kneading machine, obtains raw mixture；
(2) B layers of raw material are weighed by formula, is extruded through double screw extruder after drying, mixing device, A layers of raw material is through list
Screw extruder melting extrusion, A layers of raw material and B layers of raw material are extruded at die head with main stor(e)y and auxiliary layer co-cast, cool down slab,
By longitudinal stretching, cross directional stretch, thermal finalization treatment forms reflectance coating.
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| 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 |
| CN108761590A (en) * | 2018-06-06 | 2018-11-06 | 曹立军 | A kind of scattered reflection type reflectance coating and preparation method thereof |
| CN108752629A (en) * | 2018-06-06 | 2018-11-06 | 曹立军 | A kind of preparation method of light diffusing particles |
| 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 |
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| 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 |
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| CN112485946A (en) * | 2020-12-02 | 2021-03-12 | 合肥乐凯科技产业有限公司 | Reflective film for thin direct type liquid crystal display device 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 |
| CN117183535A (en) * | 2023-11-02 | 2023-12-08 | 宁波长阳科技股份有限公司 | High-reflection ultraviolet-resistant foaming gap film 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 |
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