CN103091733B - Optical reflecting film used for backlight units - Google Patents
Optical reflecting film used for backlight units Download PDFInfo
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- CN103091733B CN103091733B CN201310024683.XA CN201310024683A CN103091733B CN 103091733 B CN103091733 B CN 103091733B CN 201310024683 A CN201310024683 A CN 201310024683A CN 103091733 B CN103091733 B CN 103091733B
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Abstract
The invention relates to an optical reflecting film used for backlight units. The optical reflecting film structurally comprises base material, a reflecting layer, an H layer and an L layer in sequence, wherein the base material is a polyester layer in which no pore exists, the reflecting layer is a polyester layer in which pores exist, and the H layer has a higher refractive index relative to the L layer. The reflecting film is simple in structure, the reflectivity is over 98%, and when a high reflectivity is maintained, the reflecting film further has high stiffness, so that the reflecting film is beneficial for later-period using and processing of the reflecting film and the improvement of light saturation of a liquid crystal display frame, and can be widely applied to various products which have the requirements for light reflecting and include the backlight units of a liquid crystal display (LCD) and the like.
Description
Technical field
The present invention relates to a kind of backlight module optical reflectance coating.
Background technology
All the time, flat-panel monitor is widely used in TV, computer monitor, notebook computer, mobile phone, digital camera, palm PC, GPS navigator etc.The picture light source of these liquid crystal display provided by backlight module wherein, and the quality of backlight performance, except directly affecting the brightness of LCD video picture quality, particularly backlight, directly has influence on the brightness on LCD surface.
Liquid crystal backlight system, primarily of light source, light guide plate, all kinds of blooming piece composition, has brightness high, the features such as the life-span is long, luminescence is even.Along with LCD module constantly to brighter, gentlier, thinner future development, side-light type CCFL formula backlight become current backlight development main flow.
The major optical diaphragm of liquid crystal backlight system has diffusion barrier, brightness enhancement film and reflectance coating.The Main Function of reflectance coating will spill the light high-level efficiency bottom light guide plate and reflect losslessly, thus can reduce light loss, reduces power consumption, provide LCD light saturation degree.
How improving the optical property of reflectance coating, improve reflectivity, reduce light loss, thus the light sent from light source can at utmost be utilized, is a present field of liquid crystal display important topic urgently to be resolved hurrily.In prior art, in order to improve reflectivity, general by adding particle or making reflectance coating produce micropore or bubble, utilize the reflection at interface between the reflection of particle interface or the substrate resin of film and micropore or bubble to improve reflectivity, although these methods can improve the reflectivity of film, along with the raising of the porosity in reflectance coating, make reflectance coating deliquescing, cause reflectance coating to be easy to scuffing, wrinkle in use process, affect brightness and the image quality of backlight and display.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of backlight module optical reflectance coating, and described optical reflectance coating has high-stiffness high reflectance.
For solving the problem, the technical solution used in the present invention is:
A kind of backlight module optical reflectance coating, the film structure of described optical reflectance coating is: be divided into base material/reflection horizon/H layer/L layer successively, and wherein, base material is the inner polyester layer not containing hole, reflection horizon is the inner polyester layer containing hole, and H layer has higher refractive index relative to L layer.
In above-mentioned optical reflectance coating, the porosity in described reflection horizon is 10% ~ 40%, and described hole is formed by microvesicle, inorganic particulate, microvesicle and inorganic particulate.
In above-mentioned optical reflectance coating, the empty diameter of bubble of described microvesicle is 0.5 ~ 4 micron.
In above-mentioned optical reflectance coating, described inorganic particulate be selected from particle diameter be 0.5 ~ 3 micron barium sulphate, calcium carbonate, calcium sulphate, magnesium oxide, zinc paste, aluminium oxide, titanium dioxide or silicon dioxide.
In above-mentioned optical reflectance coating, described microvesicle and the volume ratio of inorganic particulate are: 1:9 ~ 9:1.
In above-mentioned optical reflectance coating, the difference of the refractive index of described H layer and the refractive index of L layer is greater than 0.6.
In above-mentioned optical reflectance coating, described H layer is solidified by coating liquid and obtains, and the thickness of H layer is 4 ~ 60 microns; Described coating fluid is that resin is added butanone and toluene, by resin dissolves, then is added wherein by TiO 2 particles, then adds levelling agent and initiating agent, stir obtained.
In above-mentioned optical reflectance coating, described resin is selected from one or more in biphenyl resin, mercaptan resin, two fluorenes resin, isothiocyanates type polyurethane resin, diphenyl sulfide epoxy resin.
In above-mentioned optical reflectance coating, the particle diameter of the particle of described titania is 3 ~ 50 microns.
In above-mentioned optical reflectance coating, described L layer is fluoropolymer resin layer, and the thickness of L layer is 3 ~ 10 microns.
Compared with prior art, tool of the present invention has the following advantages:
1. reflecting film structure is simple.
2. owing to adopting inside there is no the polyester layer of hole as base material, significantly improve the deflection of reflectance coating, simultaneously by the adjustment to space in reflection horizon, while acquisition high-stiffness, improve reflectivity; . by arranging H layer and L layer further, to H layer, the thickness of L layer and the control of refractive index difference, and by the combination between they and reflection horizon, obtain the high reflectance of more than 98%.
3. the present invention is while maintenance high-stiffness, and the later stage being conducive to reflectance coating uses processing and improves the light saturation degree of liquid crystal display picture.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, each list of reference numerals is: 1, base material; 2, reflection horizon; 3, H layer; 4, L layer; 5, microvesicle or inorganic particulate; 6, TiO 2 particles.
Embodiment
In the present invention, the polyester layer of to be material of main part the be polyester of the base material as reflectance coating, polyester can be selected from as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate etc.The inside of base material does not have hole, plays the work of supporting layer in order to improve the deflection of film.The thickness of the present invention to base material is not particularly limited, and the thickness of base material can be 25 ~ 60% of reflectance coating gross thickness.
The material of main part in reflection horizon of the present invention is polyester, and polyester can be selected from as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate etc.Resistance light and reflex are played in reflection horizon, hole is contained in the inside in reflection horizon, these holes formed by the microvesicle be added in reflection horizon, inorganic particulate or both potpourris, utilize hole interface to the reflection of light to improve reflectivity, but the aperture of hole and density can not be too large, otherwise, the easy deliquescing of reflectance coating, tear, the processing affecting the later stage uses, and the porosity in reflection horizon of the present invention controls 10% ~ 40%.Described microvesicle is gasified by liquid carbon dioxide and produces, and the empty diameter of bubble of microvesicle is 0.5 ~ 4 micron; Described inorganic particulate can be selected from barium sulphate, calcium carbonate, calcium sulphate, magnesium oxide, zinc paste, aluminium oxide, titanium dioxide or silicon dioxide, and its particle diameter is 0.5 ~ 3 micron; If microvesicle and inorganic particulate used in combination, then the volume ratio of microvesicle and inorganic particulate controls the scope at 1:9 ~ 9:1;
In reflection horizon containing microvesicle, particle or both mix interpolation polyester form, described microvesicle is carbon dioxide microvesicle, Cell Size is 0.5-4 micron, described particle is the inorganic particulates such as barium sulphate, calcium carbonate, calcium sulphate, magnesium oxide, zinc paste, aluminium oxide, titanium dioxide, silicon dioxide, size is 0.5-3 micron, and the porosity in described reflection horizon is 10%-40%.Further, the reflection horizon of described microvesicle and particle mixing addition type, the volume ratio of its microvesicle and particle is: 1:9 ~ 9:1.The thickness of the present invention to reflection horizon is not particularly limited, and can be 20 ~ 70% of reflectance coating gross thickness.
In order to improve the reflectivity of reflectance coating further, the present invention arranges H layer and L layer on the surface in reflection horizon, H layer is between reflection horizon and L layer, and H layer has higher refractive index relative to L layer, and the difference of the refractive index of preferred H layer and the refractive index of L layer is more than 0.6.Wherein, H layer is solidified by the coating liquid containing resin and TiO 2 particles and obtains, resin is high folding resin, and concrete kind can be selected from one or more in commercially available biphenyl resin, mercaptan resin, two fluorenes resin, isothiocyanates type polyurethane resin, diphenyl sulfide epoxy resin; The object of adding TiO 2 particles in H layer is the refractive index providing H layer further, and the size controlling of the particle of titania is at 3 ~ 50 microns; The thickness of H layer is 4 ~ 60 microns.L layer is fluoropolymer resin layer, and the thickness of L layer is 3 ~ 10 microns..
By entering H layer, the thickness of L layer and the control of refractive index difference, and by the combination between they and reflection horizon, the reflectivity of the reflectance coating that the present invention is obtained reaches more than 98%,
Reflectance coating provided by the invention, can be obtained, as uniaxial tension or two-way stretch by known method.As method described below:
In the present invention, the polyester raw material section of the substrate layer of the reflectance coating mixed carries out crystallizing and drying process at 150 ~ 180 DEG C, then sends into single screw extrusion machine, melt extrudes at 260 DEG C ~ 300 DEG C; Preferably melt extrude at 265 DEG C ~ 285 DEG C; The polyester raw material section in the reflection horizon of the reflectance coating mixed carries out crystallizing and drying process at 150 ~ 180 DEG C, send into single screw extrusion machine to melt extrude, or do not carry out drying process, send into double screw extrusion machine and melt extrude, preferably melt extrude at 265 DEG C ~ 285 DEG C; After stretched, thermal finalization at 210 DEG C ~ 240 DEG C; Reflection horizon and substrate layer are extruded through extruder, and the substrate layer of melting and reflection horizon polyester fondant flow out co-extrusion on the roller of quenching through metering and filtration from Double-chamber T shape die head, and quenching becomes unformed sheet; Unformed sheet is longitudinal stretching 2.5 ~ 3.5 times after series of drums preheating; Enter transverse stretching machine after cooling and carry out cross directional stretch 3.0 ~ 4.0 times; Through thermal finalization process trimming rolling, according to requirements make the semi-manufacture film that thickness is 100 microns ~ 350 microns.
At the surface of semi-manufacture film coating H layer coating fluid, again at the L layer coating fluid of the surface of H layer coating after solidification, after solidification, obtain backlight module optical reflectance coating of the present invention.
Below in conjunction with drawings and Examples, the present invention is described in further detail, but this embodiment should not be construed as limiting the scope of the invention.
Embodiment 1
The configuration of 1.H layer coating fluid:
By adding butanone and toluene in biphenyl resin, by resin dissolves, then the TiO 2 particles of 10 microns is joined in the resin that dissolved, add levelling agent and initiating agent (or hardening agent) again, height stirs and is uniformly dispersed, and the weight content obtaining titania is the H layer coating fluid of 40%, for subsequent use.
The configuration of 2.L layer coating fluid:
Fluorine resin butanone and toluene are diluted, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, for subsequent use.
3. the preparation of reflectance coating:
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate polyester section and containing particle diameter be the silica additive of 1.5 microns masterbatch section mix, the content of final silicon dioxide granule is made to be 15%, by the section that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, make final voidage be 20%; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 40/60, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture; Half-finished reflection horizon is coated with above-mentioned H layer coating fluid, after solidification, then on H layer, is coated with above-mentioned L layer coating fluid, obtains reflectance coating after solidification, survey its performance.
Embodiment 2:
The configuration of 1.H layer coating fluid:
By adding butanone and toluene in biphenyl resin, by resin dissolves, then the TiO 2 particles of 25 microns is joined in the resin that dissolved, add levelling agent and initiating agent (or hardening agent) again, height stirs and is uniformly dispersed, and the weight content obtaining titania is the H layer coating fluid of 50%, for subsequent use.
The configuration of 2.L layer coating fluid:
Fluorine resin butanone and toluene are diluted, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, for subsequent use.
3. the preparation of reflectance coating:
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate polyester section and containing particle diameter be the barium sulphate adjuvant of 3.0 microns masterbatch section mix, the content of final barium sulfate particles is made to be 25%, by the section that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, make final voidage be 30%; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 50/50, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture; Half-finished reflection horizon is coated with above-mentioned H layer coating fluid, after solidification, then on H layer, is coated with above-mentioned L layer coating fluid, obtains reflectance coating after solidification, survey its performance.
Embodiment 3:
The configuration of 1.H layer coating fluid:
By adding butanone and toluene in biphenyl resin, by resin dissolves, then the TiO 2 particles of 40 microns is joined in the resin that dissolved, add levelling agent and initiating agent (or hardening agent) again, height stirs and is uniformly dispersed, and the weight content obtaining titania is the H layer coating fluid of 50%, for subsequent use.
The configuration of 2.L layer coating fluid:
Fluorine resin butanone and toluene are diluted, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, for subsequent use.
3. the preparation of reflectance coating:
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate polyester section and containing particle diameter be the barium sulphate adjuvant of 0.5 micron masterbatch section mix, the content of final barium sulfate particles is made to be 35%, by the section that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, make final voidage be 40%; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 60/40, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture; Half-finished reflection horizon is coated with above-mentioned H layer coating fluid, after solidification, then on H layer, is coated with above-mentioned L layer coating fluid, obtains reflectance coating after solidification, survey its performance.
Embodiment 4:
The configuration of 1.H layer coating fluid:
By adding butanone and toluene in biphenyl resin, by resin dissolves, then the TiO 2 particles of 50 microns is joined in the resin that dissolved, add levelling agent and initiating agent (or hardening agent) again, height stirs and is uniformly dispersed, and the weight content obtaining titania is the H layer coating fluid of 60%, for subsequent use.
The configuration of 2.L layer coating fluid:
Fluorine resin butanone and toluene are diluted, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, for subsequent use.
3. the preparation of reflectance coating:
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate polyester section and containing particle diameter be the silica additive of 2.0 microns masterbatch section mix, the content of final silicon dioxide granule is made to be 35%, by the section that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, make final voidage be 40%; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 70/30, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture; Half-finished reflection horizon is coated with above-mentioned H layer coating fluid, after solidification, then on H layer, is coated with above-mentioned L layer coating fluid, obtains reflectance coating after solidification, survey its performance.
Embodiment 5
The configuration of 1.H layer coating fluid:
By adding butanone and toluene in biphenyl resin, by resin dissolves, then the TiO 2 particles of 10 microns is joined in the resin that dissolved, add levelling agent and initiating agent (or hardening agent) again, height stirs and is uniformly dispersed, and the weight content obtaining titania is the H layer coating fluid of 40%, for subsequent use.
The configuration of 2.L layer coating fluid:
Fluorine resin butanone and toluene are diluted, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, for subsequent use.
3. the preparation of reflectance coating:
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate in be evenly mixed with liquid carbon dioxide, the content of final carbon dioxide is made to be 15%, by the material that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, in heating process, liquid carbon dioxide gasification produces micropore, makes final voidage be 20%; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 40/60, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture; Half-finished reflection horizon is coated with above-mentioned H layer coating fluid, after solidification, then on H layer, is coated with above-mentioned L layer coating fluid, obtains reflectance coating after solidification, survey its performance.
Embodiment 6
The configuration of 1.H layer coating fluid:
By adding butanone and toluene in biphenyl resin, by resin dissolves, then the TiO 2 particles of 10 microns is joined in the resin that dissolved, add levelling agent and initiating agent (or hardening agent) again, height stirs and is uniformly dispersed, and the weight content obtaining titania is the H layer coating fluid of 40%, for subsequent use.
The configuration of 2.L layer coating fluid:
Fluorine resin butanone and toluene are diluted, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, for subsequent use.
3. the preparation of reflectance coating:
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate in be evenly mixed with liquid carbon dioxide and titanium dioxide additive, the content of final liquid carbon dioxide is made to be 1.5%, the content of titania is 13.5%, by the material that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, in heating process, liquid carbon dioxide gasification produces micropore, make final voidage be 20%, the volume ratio of microvesicle and titania is 1:9; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 50/50, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture; Half-finished reflection horizon is coated with above-mentioned H layer coating fluid, after solidification, then on H layer, is coated with above-mentioned L layer coating fluid, obtains reflectance coating after solidification, survey its performance.
Embodiment 7
The configuration of 1.H layer coating fluid:
By adding butanone and toluene in biphenyl resin, by resin dissolves, then the TiO 2 particles of 10 microns is joined in the resin that dissolved, add levelling agent and initiating agent (or hardening agent) again, height stirs and is uniformly dispersed, and the weight content obtaining titania is the H layer coating fluid of 40%, for subsequent use.
The configuration of 2.L layer coating fluid:
Fluorine resin butanone and toluene are diluted, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, for subsequent use.
3. the preparation of reflectance coating:
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate in be evenly mixed with liquid carbon dioxide and titanium dioxide additive, the content of final liquid carbon dioxide is made to be 13.5%, the content of titania is 1.5%, by the material that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, in heating process, liquid carbon dioxide gasification produces micropore, make final voidage be 20%, the volume ratio of microvesicle and titania is 9:1; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 40/60, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture; Half-finished reflection horizon is coated with above-mentioned H layer coating fluid, after solidification, then on H layer, is coated with above-mentioned L layer coating fluid, obtains reflectance coating after solidification, survey its performance.
Embodiment 8
The configuration of 1.H layer coating fluid:
By adding butanone and toluene in biphenyl resin, by resin dissolves, then the TiO 2 particles of 10 microns is joined in the resin that dissolved, add levelling agent and initiating agent (or hardening agent) again, height stirs and is uniformly dispersed, and the weight content obtaining titania is the H layer coating fluid of 40%, for subsequent use.
The configuration of 2.L layer coating fluid:
Fluorine resin butanone and toluene are diluted, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, for subsequent use.
3. the preparation of reflectance coating:
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate in be evenly mixed with liquid carbon dioxide and titanium dioxide additive, the content of final liquid carbon dioxide is made to be 10%, the content of titania is 10%, by the material that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, in heating process, liquid carbon dioxide gasification produces micropore, make final voidage be 25%, the volume ratio of microvesicle and titania is 1:1; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 60/40, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture; Half-finished reflection horizon is coated with above-mentioned H layer coating fluid, after solidification, then on H layer, is coated with above-mentioned L layer coating fluid, obtains reflectance coating after solidification, survey its performance.
Comparative example
By limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in substrate layer extruder and melt extrudes at 275 DEG C; By limiting viscosity be 0.65dl/g polyethylene terephthalate polyester section and containing particle diameter be the silica additive of 2.0 microns masterbatch section mix, the content of final silicon dioxide granule is made to be 15%, by the section that mixes 170 DEG C of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extrude at 275 DEG C, make final voidage be 20%; The melt in substrate layer and reflection horizon enters two-chamber die head after filtering and flows on slab roller and cast amorphous sheet.Reflection horizon and polyester layer Thickness Ratio are 40/60, and slab is through longitudinal preheating longitudinal stretching 2.9 times, and cross directional stretch 3.5 times, is wound into semi-manufacture, surveys its performance.
Table 1: the performance test data table of each embodiment
。In table, the method for testing of properties is as follows:
1. thickness measure
The reflective film getting full width measures the thickness of 15 points, calculating mean value within the scope of overall with.Use instrument thousand points of desk-top THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS (CH-1-ST) Shanghai six water chestnut instrument plants.
2. the mensuration of reflectivity:
Reflectance coating print is placed in the reflectivity calculating mean value that spectrophotometric color measurement instrument (Konica-Minolta 2500d) test 9 points go out at 550nm.
3. deflection
Get the strip film print of 20mmX200mm, horizontal positioned, clamping length 20mm, using the horizontal position difference of free end and bare terminal end as the evaluation criterion of deflection.
4. crimpness
Thin film planar is interior is length direction along the direction that bending direction is maximum, and get the microscler print 150mmX600mm of film, film lies in a horizontal plane on the desktop of level.Write down the difference in height of film length two ends and horizontal table top, using the evaluation criterion as crimpness that difference in height is maximum.
5. arrange performance
Get film print length 4000m to cut, collect the amount of powder that cutter produces, as the Appreciation gist of sample last phase tidying up performance.
>5g is that last phase tidying up is poor
<5g and >1g is that last phase tidying up is better
<1g is that last phase tidying up is good
6. the measurement of porosity:
Film print quality about the 1 gram precision of getting 1cmX1cm size is the balance precise quality of 0.1mg.Range is used to be that the volume of print measured by the graduated cylinder that 10ml contains suitable quantity of water, thus the density p of computational reflect film and the standard of mylar is close presses ρ
0=1.395 calculate.
Porosity=(ρ
0-ρ)/ρ
0.
Claims (9)
1. a backlight module optical reflectance coating, it is characterized in that, the film structure of described optical reflectance coating is: be divided into base material/reflection horizon/H layer/L layer successively, wherein, base material is the inner polyester layer not containing hole, reflection horizon is the inner polyester layer containing hole, and H layer has higher refractive index relative to L layer;
The porosity in described reflection horizon is 10% ~ 40%, and described hole is formed by microvesicle, inorganic particulate, microvesicle and inorganic particulate.
2. optical reflectance coating according to claim 1, is characterized in that, the empty diameter of bubble of described microvesicle is 0.5 ~ 4 micron.
3. optical reflectance coating according to claim 2, is characterized in that, described inorganic particulate is barium sulphate, calcium carbonate, calcium sulphate, magnesium oxide, zinc paste, aluminium oxide, titanium dioxide or silicon dioxide, and its particle diameter is 0.5 ~ 3 micron.
4. optical reflectance coating according to claim 3, is characterized in that, described microvesicle and the volume ratio of inorganic particulate are: 1:9 ~ 9:1.
5. optical reflectance coating according to claim 4, is characterized in that, the difference of the refractive index of described H layer and the refractive index of L layer is greater than 0.6.
6. optical reflectance coating according to claim 5, is characterized in that, described H layer is solidified by coating liquid and obtains, and the thickness of H layer is 4 ~ 60 microns; Described coating fluid is that resin is added butanone and toluene, by resin dissolves, then is added wherein by TiO 2 particles, then adds levelling agent and initiating agent, stir obtained.
7. optical reflectance coating according to claim 6, is characterized in that, described resin is selected from one or more in biphenyl resin, mercaptan resin, two fluorenes resin, isothiocyanates type polyurethane resin, diphenyl sulfide epoxy resin.
8. optical reflectance coating according to claim 7, is characterized in that, the particle diameter of the particle of described titania is 3 ~ 50 microns.
9. optical reflectance coating according to claim 8, is characterized in that, described L layer is fluoropolymer resin layer, and the thickness of L layer is 3 ~ 10 microns.
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