CN103091733A - Optical reflecting film used for backlight units - Google Patents
Optical reflecting film used for backlight units Download PDFInfo
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- CN103091733A CN103091733A CN201310024683XA CN201310024683A CN103091733A CN 103091733 A CN103091733 A CN 103091733A CN 201310024683X A CN201310024683X A CN 201310024683XA CN 201310024683 A CN201310024683 A CN 201310024683A CN 103091733 A CN103091733 A CN 103091733A
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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 navigation instrument etc.The picture light source of these liquid crystal display is provided by backlight module wherein, and the quality of backlight performance directly affects the brightness of LCD video picture quality, particularly backlight except meeting, directly have influence on the brightness on LCD surface.
The liquid crystal backlight system mainly is comprised of light source, light guide plate, all kinds of blooming piece, has brightness high, and the life-span is long, the luminous characteristics such as evenly.Constantly to brighter, lighter, thinner future development, side-light type CCFL formula backlight becomes the main flow of present backlight development along with the LCD module.
The main blooming piece of liquid crystal backlight system has diffusion barrier, brightness enhancement film and reflectance coating.The Main Function of reflectance coating is to spill light high-level efficiency and lossless the reflection of light guide plate bottom, thereby can reduce light loss, reduces power consumption, and LCD light saturation degree is provided.
How improving the optical property of reflectance coating, improve reflectivity, reduce light loss, thereby make the light that sends from light source at utmost to be utilized, is the important topic that present field of liquid crystal display needs to be resolved hurrily.In prior art, in order to improve reflectivity, generally by adding particle or making reflectance coating produce micropore or bubble, utilize the reflection at interface between the substrate resin of the reflection of particle interface or film and micropore or bubble to improve reflectivity, although these methods can improve the reflectivity of film,, raising along with the porosity in reflectance coating, make the reflectance coating deliquescing, cause reflectance coating to be easy to scuffing, wrinkle in using 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 the high-stiffness high reflectance.
For addressing the above 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 successively base material/reflection horizon/H layer/L layer, wherein, base material is the inner polyester layer that does not contain hole, the reflection horizon is the inner polyester layer that contains hole, and the H layer has higher refractive index with respect to the 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 the bubble of described microvesicle is 0.5～4 micron.
In above-mentioned optical reflectance coating, it is barium sulphate, calcium carbonate, calcium sulphate, magnesium oxide, zinc paste, aluminium oxide, titanium dioxide or the silicon dioxide of 0.5～3 micron that described inorganic particulate is selected from particle diameter.
In above-mentioned optical reflectance coating, the volume ratio of described microvesicle and inorganic particulate is: 1:9 ~ 9:1.
In above-mentioned optical reflectance coating, the difference of the refractive index of the refractive index of described H layer and L layer is greater than 0.6.
In above-mentioned optical reflectance coating, described H layer applies curing by coating fluid and obtains, and the thickness of H layer is 4 ~ 60 microns; Described coating fluid is that resin is added butanone and toluene, with resin dissolves, then TiO 2 particles is added wherein, then add levelling agent and initiating agent, stirs to make.
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, the present invention has following advantage:
1. reflecting film structure is simple.
2. owing to adopting the inner polyester layer that there is no hole as base material, obviously improve the deflection of reflectance coating, simultaneously by the adjustment to space in the reflection horizon, improved reflectivity when obtaining high-stiffness; . by H layer and L layer further are set, to the thickness of H layer, L layer and the control of refractive index difference, and by the combination between they and reflection horizon, obtained the high reflectance more than 98%.
3. the present invention is when keeping high-stiffness, and the later stage that is conducive to reflectance coating is used the light saturation degree of processing and raising liquid crystal display picture.
Description of drawings
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, be that material of main part is the polyester layer of polyester as the base material of 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 present invention is not particularly limited the thickness of base material, 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 the reflection horizon, hole is contained in the inside in reflection horizon, these holes are formed by the microvesicle, inorganic particulate or both potpourris that are added in the reflection horizon, utilize the hole interface to improve reflectivity to the reflection of light, still, the aperture of hole and density can not be too large, otherwise, the easy deliquescing of reflectance coating, tear, the processing that affects the later stage is used, and the porosity in reflection horizon of the present invention is controlled at 10%～40%.Described microvesicle is produced by the liquid carbon dioxide gasification, and the empty diameter of the 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; Use if microvesicle and inorganic particulate mix, the volume ratio of microvesicle and inorganic particulate is controlled at the scope of 1:9 ~ 9:1;
Containing the polyester that microvesicle, particle or both mix interpolation in the reflection horizon consists of, described microvesicle is the carbon dioxide microvesicle, Cell Size is the 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 the 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 present invention is not particularly limited the thickness in reflection horizon, can be 20～70% of reflectance coating gross thickness.
In order further to improve the reflectivity of reflectance coating, the present invention arranges H layer and L layer on the surface in reflection horizon, the H layer is between reflection horizon and L layer, and the H layer has higher refractive index with respect to the 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, the H layer applies curing by the coating fluid that contains 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 purpose of adding TiO 2 particles in the H layer is the refractive index that the H layer further is provided, and the particle diameter of the particle of titania is controlled at 3 ~ 50 microns; The thickness of H layer is 4 ~ 60 microns.The L layer is fluoropolymer resin layer, and the thickness of L layer is 3～10 microns..
By advancing the thickness of H layer, 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 obtains has been reached more than 98%,
Reflectance coating provided by the invention can obtain by known method, as uniaxial tension or two-way stretch.As the method for describing below:
In the present invention, the section of the polyester raw material of the substrate layer of the reflectance coating that mixes is carried out the crystallizing and drying processing at 150～180 ℃, then sends into single screw extrusion machine, melt extrudes under 260 ℃～300 ℃; Preferably melt extrude under 265 ℃～285 ℃; The polyester raw material section in the reflection horizon of the reflectance coating that mixes is carried out crystallizing and drying at 150～180 ℃ and is processed, sending into single screw extrusion machine melt extrudes, perhaps do not carry out drying and process, send into double screw extrusion machine and melt extrude, preferably melt extrude under 265 ℃～285 ℃; After stretched, 210 ℃～240 ℃ lower thermal finalizations; Reflection horizon and substrate layer are extruded through extruder, and the substrate layer of melting and reflection horizon polyester fondant flow out co-extrusion to the roller of quenching through metering and filtration from the Double-chamber T shape die head, and quenching becomes unformed sheet; After the preheating of unformed sheet process series of drums, longitudinal stretching is 2.5～3.5 times; Enter transverse stretching machine after cooling and carry out 3.0～4.0 times of cross directional stretchs; Process the trimming rolling through thermal finalization, according to requirements make thickness and be the semi-manufacture film of 100 microns～350 microns.
Apply H layer coating fluid on the surface of semi-manufacture film, the L layer coating fluid that applies on the surface of H layer again after curing obtains backlight module optical reflectance coating of the present invention after curing.
The present invention is described in further detail below in conjunction with drawings and Examples, but this embodiment should not be construed as limiting the scope of the invention.
1.H the configuration of layer coating fluid:
With adding butanone and toluene in biphenyl resin, with resin dissolves, then the TiO 2 particles of 10 microns is joined dissolve in good resin, add again levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and the weight content that obtains titania is 40% H layer coating fluid, and is standby.
2.L the configuration of layer coating fluid:
Fluorine resin is diluted with butanone and toluene, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, and is standby.
3. the preparation of reflectance coating:
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be the polyethylene terephthalate polyester section of 0.65dl/g and to contain particle diameter be that the masterbatch section of the silica additive of 1.5 microns mixes with limiting viscosity, the content that makes final silicon dioxide granule is 15%, with the section that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, making final voidage is 20%; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 40/60, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture; The above-mentioned H layer coating fluid of coating on half-finished reflection horizon after curing, then is coated with above-mentioned L layer coating fluid on the H layer, obtain reflectance coating after curing, surveys its performance.
Embodiment 2:
1.H the configuration of layer coating fluid:
With adding butanone and toluene in biphenyl resin, with resin dissolves, then the TiO 2 particles of 25 microns is joined dissolve in good resin, add again levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and the weight content that obtains titania is 50% H layer coating fluid, and is standby.
2.L the configuration of layer coating fluid:
Fluorine resin is diluted with butanone and toluene, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, and is standby.
3. the preparation of reflectance coating:
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be the polyethylene terephthalate polyester section of 0.65dl/g and to contain particle diameter be that the masterbatch section of the barium sulphate adjuvant of 3.0 microns mixes with limiting viscosity, the content that makes final barium sulphate particle is 25%, with the section that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, making final voidage is 30%; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 50/50, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture; The above-mentioned H layer coating fluid of coating on half-finished reflection horizon after curing, then is coated with above-mentioned L layer coating fluid on the H layer, obtain reflectance coating after curing, surveys its performance.
Embodiment 3:
1.H the configuration of layer coating fluid:
With adding butanone and toluene in biphenyl resin, with resin dissolves, then the TiO 2 particles of 40 microns is joined dissolve in good resin, add again levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and the weight content that obtains titania is 50% H layer coating fluid, and is standby.
2.L the configuration of layer coating fluid:
Fluorine resin is diluted with butanone and toluene, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, and is standby.
3. the preparation of reflectance coating:
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be the polyethylene terephthalate polyester section of 0.65dl/g and to contain particle diameter be that the masterbatch section of the barium sulphate adjuvant of 0.5 micron mixes with limiting viscosity, the content that makes final barium sulphate particle is 35%, with the section that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, making final voidage is 40%; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 60/40, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture; The above-mentioned H layer coating fluid of coating on half-finished reflection horizon after curing, then is coated with above-mentioned L layer coating fluid on the H layer, obtain reflectance coating after curing, surveys its performance.
Embodiment 4:
1.H the configuration of layer coating fluid:
With adding butanone and toluene in biphenyl resin, with resin dissolves, then the TiO 2 particles of 50 microns is joined dissolve in good resin, add again levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and the weight content that obtains titania is 60% H layer coating fluid, and is standby.
2.L the configuration of layer coating fluid:
Fluorine resin is diluted with butanone and toluene, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, and is standby.
3. the preparation of reflectance coating:
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be the polyethylene terephthalate polyester section of 0.65dl/g and to contain particle diameter be that the masterbatch section of the silica additive of 2.0 microns mixes with limiting viscosity, the content that makes final silicon dioxide granule is 35%, with the section that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, making final voidage is 40%; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 70/30, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture; The above-mentioned H layer coating fluid of coating on half-finished reflection horizon after curing, then is coated with above-mentioned L layer coating fluid on the H layer, obtain reflectance coating after curing, surveys its performance.
1.H the configuration of layer coating fluid:
With adding butanone and toluene in biphenyl resin, with resin dissolves, then the TiO 2 particles of 10 microns is joined dissolve in good resin, add again levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and the weight content that obtains titania is 40% H layer coating fluid, and is standby.
2.L the configuration of layer coating fluid:
Fluorine resin is diluted with butanone and toluene, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, and is standby.
3. the preparation of reflectance coating:
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be evenly to be mixed with liquid carbon dioxide in the polyethylene terephthalate of 0.65dl/g with limiting viscosity, the content that makes final carbon dioxide is 15%, with the material that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, the liquid carbon dioxide gasification produces micropore in heating process, and making final voidage is 20%; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 40/60, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture; The above-mentioned H layer coating fluid of coating on half-finished reflection horizon after curing, then is coated with above-mentioned L layer coating fluid on the H layer, obtain reflectance coating after curing, surveys its performance.
Embodiment 6
1.H the configuration of layer coating fluid:
With adding butanone and toluene in biphenyl resin, with resin dissolves, then the TiO 2 particles of 10 microns is joined dissolve in good resin, add again levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and the weight content that obtains titania is 40% H layer coating fluid, and is standby.
2.L the configuration of layer coating fluid:
Fluorine resin is diluted with butanone and toluene, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, and is standby.
3. the preparation of reflectance coating:
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be evenly to be mixed with liquid carbon dioxide and titanium dioxide additive in the polyethylene terephthalate of 0.65dl/g with limiting viscosity, the content that makes final liquid carbon dioxide is 1.5%, the content of titania is 13.5%, with the material that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, the liquid carbon dioxide gasification produces micropore in heating process, making final voidage is 20%, and the volume ratio of microvesicle and titania is 1:9; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 50/50, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture; The above-mentioned H layer coating fluid of coating on half-finished reflection horizon after curing, then is coated with above-mentioned L layer coating fluid on the H layer, obtain reflectance coating after curing, surveys its performance.
Embodiment 7
1.H the configuration of layer coating fluid:
With adding butanone and toluene in biphenyl resin, with resin dissolves, then the TiO 2 particles of 10 microns is joined dissolve in good resin, add again levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and the weight content that obtains titania is 40% H layer coating fluid, and is standby.
2.L the configuration of layer coating fluid:
Fluorine resin is diluted with butanone and toluene, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, and is standby.
3. the preparation of reflectance coating:
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be evenly to be mixed with liquid carbon dioxide and titanium dioxide additive in the polyethylene terephthalate of 0.65dl/g with limiting viscosity, the content that makes final liquid carbon dioxide is 13.5%, the content of titania is 1.5%, with the material that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, the liquid carbon dioxide gasification produces micropore in heating process, making final voidage is 20%, and the volume ratio of microvesicle and titania is 9:1; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 40/60, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture; The above-mentioned H layer coating fluid of coating on half-finished reflection horizon after curing, then is coated with above-mentioned L layer coating fluid on the H layer, obtain reflectance coating after curing, surveys its performance.
Embodiment 8
1.H the configuration of layer coating fluid:
With adding butanone and toluene in biphenyl resin, with resin dissolves, then the TiO 2 particles of 10 microns is joined dissolve in good resin, add again levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and the weight content that obtains titania is 40% H layer coating fluid, and is standby.
2.L the configuration of layer coating fluid:
Fluorine resin is diluted with butanone and toluene, then add levelling agent and initiating agent (or hardening agent), height stirs and is uniformly dispersed, and obtains .L layer coating fluid, and is standby.
3. the preparation of reflectance coating:
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be evenly to be mixed with liquid carbon dioxide and titanium dioxide additive in the polyethylene terephthalate of 0.65dl/g with limiting viscosity, the content that makes final liquid carbon dioxide is 10%, the content of titania is 10%, with the material that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, the liquid carbon dioxide gasification produces micropore in heating process, making final voidage is 25%, and the volume ratio of microvesicle and titania is 1:1; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 60/40, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture; The above-mentioned H layer coating fluid of coating on half-finished reflection horizon after curing, then is coated with above-mentioned L layer coating fluid on the H layer, obtain reflectance coating after curing, surveys its performance.
Comparative Examples
With limiting viscosity be the polyethylene terephthalate polyester section of 0.65dl/g 170 ℃ of crystallizations, then drying is sent into the material of advantages of good crystallization in the substrate layer extruder and is melt extruded under 275 ℃; Be the polyethylene terephthalate polyester section of 0.65dl/g and to contain particle diameter be that the masterbatch section of the silica additive of 2.0 microns mixes with limiting viscosity, the content that makes final silicon dioxide granule is 15%, with the section that mixes 170 ℃ of crystallizations, dry, then the material of advantages of good crystallization is sent in the extruder of reflection horizon and melt extruded under 275 ℃, making final voidage is 20%; The melt in substrate layer and reflection horizon enters after filtering the two-chamber die head and flows to and cast amorphous sheet on slab roller.Reflection horizon and polyester layer Thickness Ratio are 40/60, and slab is through 2.9 times of vertical preheating longitudinal stretchings, and 3.5 times of cross directional stretchs are wound into semi-manufacture, survey 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 that rounds the fabric width degree is measured the thickness of 15 points, calculating mean value in the overall with scope.Use instrument thousand minutes desk-top THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS (CH-1-ST) Shanghai six water chestnut instrument plants.
2. the mensuration of reflectivity:
The reflectance coating print is placed in 9 points of spectrophotometric color measurement instrument (Konica-Minolta 2500d) test calculates mean value at the reflectivity that 550nm goes out.
3. deflection
Get the strip film print of 20mmX200mm, horizontal positioned, clamping length 20mm is with the horizontal position difference of free end and the bare terminal end evaluation criterion as deflection.
4. crimpness
Direction along the bending direction maximum in thin film planar is length direction, gets the microscler print 150mmX600mm of film, and 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, with the evaluation criterion as crimpness of difference in height maximum.
5. arrangement performance
Get film print length 4000m and cut, collect the amount of powder that cutter produces, as the evaluation foundation 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:
Porosity=(ρ
0-ρ)/ρ
0
Claims (10)
1. backlight module optical reflectance coating, it is characterized in that, the film structure of described optical reflectance coating is: be divided into successively base material/reflection horizon/H layer/L layer, wherein, base material is the inner polyester layer that does not contain hole, the reflection horizon is the inner polyester layer that contains hole, and the H layer has higher refractive index with respect to the L layer.
2. optical reflectance coating according to claim 1, is characterized in that, the porosity in described reflection horizon is 10%～40%, and described hole is formed by microvesicle, inorganic particulate, microvesicle and inorganic particulate.
3. optical reflectance coating according to claim 2, is characterized in that, the empty diameter of the bubble of described microvesicle is 0.5～4 micron.
4. optical reflectance coating according to claim 3, 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.
5. according to claim 2,3 or 4 described optical reflectance coatings, is characterized in that, the volume ratio of described microvesicle and inorganic particulate is: 1:9 ~ 9:1.
6. optical reflectance coating according to claim 5, is characterized in that, the difference of the refractive index of the refractive index of described H layer and L layer is greater than 0.6.
7. optical reflectance coating according to claim 6, is characterized in that, described H layer applies curing by coating fluid and obtains, and the thickness of H layer is 4 ~ 60 microns; Described coating fluid is that resin is added in butanone and toluene, with resin dissolves, then TiO 2 particles is added wherein, then add levelling agent and initiating agent, stirs to make.
8. optical reflectance coating according to claim 7, 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.
9. optical reflectance coating according to claim 8, is characterized in that, the particle diameter of the particle of described titania is 3 ~ 50 microns.
10. optical reflectance coating according to claim 9, 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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| CN105322433A (en) * | 2014-05-28 | 2016-02-10 | 深圳市绎立锐光科技开发有限公司 | Wavelength conversion device and related light emitting device thereof |
| CN109206648A (en) * | 2018-04-20 | 2019-01-15 | 苏州科技大学 | A kind of reflection-type colorful film |
| CN109988331A (en) * | 2015-11-04 | 2019-07-09 | 株式会社Lg化学 | Anti-reflective film and its manufacturing method |
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