CN104965245A - Heat conducting reflection film and backlight module set - Google Patents
Heat conducting reflection film and backlight module set Download PDFInfo
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- CN104965245A CN104965245A CN201510401107.1A CN201510401107A CN104965245A CN 104965245 A CN104965245 A CN 104965245A CN 201510401107 A CN201510401107 A CN 201510401107A CN 104965245 A CN104965245 A CN 104965245A
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Abstract
The invention relates to a heat conducting reflection film. The heat conducting reflection film includes a reflection layer and a diffusion layer; one surface of the reflection layer is provided with a heat conducting layer; the heat conducting reflection film is formed through multi-layer co-extrusion; the heat conducting layer contains heat conducting particles; and the weight percentage of the heat conducting particles in the heat conducting layer ranges from 1% to 50%. An A/B/C-layer co-extrusion method is adopted; a thick sheet is extruded out from a mould head; the thick sheet is subjected to casting, biaxial stretching, heat setting and coiling; and the heat conducting reflection film can be obtained. The heat conducting reflection film of the invention has excellent heat conductivity, so that deformation phenomena of the reflection film such as bending and wrinkling due to uneven heating can be avoided; the heat conducting reflection film also has a diffusion property; and therefore, production and use cost can be reduced. The heat conducting reflection film is suitable for the liquid crystal display industry.
Description
Technical field
The present invention relates to a kind of backlight source module and the reflectance coating of lamp reflector, the reflectance coating of illumination utensil that can be used for image display.Also relate to the backlight source module containing this heat conduction reflection film.
Background technology
Along with the develop rapidly of national economy, a large amount of electronic products is applied to industry-by-industry widely, and liquid crystal display (LCD) is exactly a wherein very important series products.Because LCD has, energy consumption is low, the low picture of radiation is soft, the plurality of advantages such as lightweight and portable in volume, so LCD has become current the most general display technique.
LCD is non-luminescent display device, just must can reach Presentation Function by backlight.The performance of backlight will directly affect the video picture quality of LCD, and the main member of backlight comprises: light source, light guide plate and all kinds of blooming piece.Current light source mainly contains EL, CCFL and LED these three kinds, can be divided into side-light type and straight-down negative two kinds according to distribution of light sources position difference.Along with LCD module constantly to gentlier, thinner, brighter development, side-light type back light become current backlight development main flow.
Reflectance coating, due to characteristics such as it is even, high brightness, cheapnesss, is therefore widely used in LCD backlight.The Main Function of reflectance coating is the reflectivity improving optical surface, is reflected expeditiously by light, thus reduces light consume, reduces power consumption, improves the light saturation degree of LCD.For improving the reflectivity of reflectance coating, widely use at present: in polyester film, add a large amount of inorganic particulate or incompatible resin, a large amount of fine cavity is formed in the process of two-way stretch, each fine cavity can be used as a total reflection unit, and the fine cavity of a large amount of dense arrangement effectively can improve reflectivity.The reflectance coating obtained by this method has higher reflectivity.But there is the reflectance coating of fine cavity because inside is full of cavity, thus reflectance coating is caused to occur obviously declining to the conduction of heat, especially the backlight of side-light type design is adopted, the light source of its heating is in one end of reflectance coating, reflectance coating entirety is heated inequality, Long-Time Service easily occur diaphragm because of inequality of being heated cause bending, the deformation phenomenons such as fold, affect the display effect of LCD.
Diffusion barrier is mainly applied to the back light part of LCD module at present.Light therethrough using polyester as the diffusion layer of base material, through making light that many refractions, reflection and scattering occur from the medium different with refractive index, can revise light uniformly area source with reach optics diffusion effect.At present, the basic structure of diffusion barrier forms as polyester two sides is coated with astigmatic optics particle over the transparent substrate, and in use, need manufacture separately, cut, use cost is higher.
Summary of the invention
The present invention for overcome existing reflectance coating exist defect, to provide a kind of heat conduction reflection film, it should have when film body is heated, can effectively solve reflectance coating because of inequality of being heated cause bend, the deformation problems such as fold.
For solving the problem, the present invention adopts following technical scheme:
A kind of heat conduction reflection film, containing reflection horizon and diffusion layer, be also provided with heat-conducting layer at the another side in reflection horizon, heat conduction reflection film is multi-layer co-extruded formation, and containing conductive particle in described heat-conducting layer, it is 1% ~ 50% that conductive particle accounts for this layer of percentage by weight.
Above-mentioned heat conduction reflection film, the particle diameter of described conductive particle is 0.01 μm ~ 15 μm.
Above-mentioned heat conduction reflection film, described conductive particle is alundum (Al2O3), aluminium nitride, zinc paste, one or more in beryllia, silicon nitride.
Above-mentioned heat conduction reflection film, described conductive particle is alundum (Al2O3).
Above-mentioned heat conduction reflection film, the thickness of described heat-conducting layer is 10 μm ~ 50 μm, and the thickness of diffusion layer is 10 μm ~ 50 μm, and the thickness in described reflection horizon is 50 μm ~ 300 μm.
Above-mentioned heat conduction reflection film, containing fine cavity in described reflection horizon, the aperture of fine cavity is 2 μm ~ 25 μm; The porosity in reflection horizon is 5% ~ 50%.
Above-mentioned heat conduction reflection film, the method that heat conduction reflection film uses A/B/C three-layer co-extruded, extrudes sheet by die head, and through slab, two-way stretch, thermal finalization and rolling obtain.
A kind of backlight source module, adopt heat conduction reflection film as above, described heat conduction reflection film and luminous light source, optically diffusion barrier, light guide plate, frame and prismatic lens form backlight source module jointly, and described heat conduction reflection film is by reflection horizon, the three-layer thin-film of heat-conducting layer and diffusion layer co-extrusion.
Beneficial effect of the present invention is:
1. the one side in reflection horizon adds one deck heat-conducting layer by the mode of co-extrusion, this layer of heat-conducting layer can make the heat at local heating position on reflectance coating conduct to each region of diaphragm fast, film body is heated evenly, what solution reflectance coating caused because of inequality of being heated effectively bends, the deformation phenomenons such as fold.
2. the one side in reflection horizon adds one deck diffusion layer by the mode of co-extrusion, gained reflectance coating has the performance of reflection and diffusion simultaneously, one deck diffusion barrier can be saved in the processing in downstream, simplify Downstream processing flow process, reduce the production cost in downstream, contribute to the loss of weight of backlight module and thinning.
3. the present invention is by with the addition of diffusion layer and heat-conducting layer respectively in the both sides, reflection horizon containing fine cavity, is that reflection horizon provides supporting role by three-layer co-extruded method; Simultaneously by controlling the content of the inorganic particulate of each layer, ensure that the film forming of heat conduction reflection film.
Accompanying drawing explanation
Fig. 1 is the structural representation of heat conduction reflection film of the present invention;
Fig. 2 is backlight module schematic diagram of the present invention.
In figure, each label is expressed as: 1, reflection horizon, and 2, fine cavity, 3, diffusion layer, 4, diffusion particle, 5, heat-conducting layer, 6, conductive particle, 7, upper diffusion sheet, 8, prismatic lens, 9, light guide plate, 10, heat conduction reflection film.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Heat conduction reflection film is formed by diffusion layer 3, reflection horizon 1 and the heat-conducting layer 5 array mode co-extrusion according to A/B/C as shown in Figure 1.
In the present invention, the clear polyester of described A/B/C layer is the polymkeric substance that dibasic acid and dibasic alcohol are obtained by polycondensation, wherein dibasic acid comprises terephthalic acid (TPA), to phenylenediacetic Acid, to naphthalene oxalic acid, m-phthalic acid, phthalic acid etc., preferred terephthalic acid (TPA), also can add a small amount of m-phthalic acid class modified copolyester; Dibasic alcohol to be carbon number be 2 ~ 4 aliphatic diol, comprise ethylene glycol, propylene glycol, butylene glycol, 1,3-PD etc., preferred ethylene glycol.Being applicable to clear polyester of the present invention is polyethylene terephthalate.
In the present invention, described heat-conducting layer 5 is made up of conductive particle 6 and clear polyester (PET).Conductive particle can be selected from oxide, nitride or other heat conductive insulating particles.Oxide is as cupric oxide, magnesium oxide, zinc paste, beryllia and alundum (Al2O3) etc., nitride is as aluminium nitride, silicon nitride and boron nitride etc., other inorganics-carbon fiber, graphite, carbon black, pottery, barium sulphate, vulcanized lead, silicon, adamas, amorphous pure synthetic single crystal diamond etc., preferentially be selected from commercially available following substances: alundum (Al2O3), aluminium nitride, boron nitride, zinc paste, the one of beryllia, silit and several.Consider the requirements such as the whiteness of heat conduction reflection film, light stability and reflectivity, preferred alundum (Al2O3), it is 1% ~ 50% that conductive particle accounts for heat-conducting layer percentage by weight, is more preferably 5% ~ 25%, then is preferably 15% ~ 20%.Described conductive particle content does not have obvious heat-conducting effect time too low, easily causes occurring tensile fracture phenomenon during described conductive particle too high levels in biaxial orientation process.The particle diameter of preferential oxidation aluminium is 0.01 μm ~ 15 μm, and the conductive particle crossing Large stone easily causes film in biaxial orientation process, occur tensile fracture phenomenon, and the surface of film is comparatively coarse.The thickness of described heat-conducting layer is 10 ~ 50 μm.
In the present invention, described reflection horizon 1 is by reflective particle, and incompatible resin and PET are formed.Reflective particle can use iron oxide, magnesium oxide, cerium oxide, zinc paste, barium carbonate, barium titanate, barium chloride, baryta hydrate, baryta, aluminium oxide, selenite, silicon dioxide, calcium carbonate, titania, zirconia, alumina silicate, mica, pearl mica, pyrophyllite clay, burns till clay, bentonitic clay, talcum, porcelain earth, calcium phosphate, mica titanium, lithium fluoride, calcium fluoride, other composite oxides etc.From the viewpoint of cheapness being obtained and the white reflection film of high reflectance, preferably use titania, barium sulphate, calcium carbonate; Preferably use barium sulphate again.Reflective particle addition is 20 weight portion ~ 70 weight portions, incompatible resin addition 3 weight portion ~ 15 weight portion, PET addition are 15 weight portion ~ 77 weight portions.The content of reflective particle is less than 20 weight portions, then reflectivity is low, in addition, if be greater than more than 70 weight portions, then in manufacturing process, frequently film rupture occurs.Incompatible resin can be preferably polyolefin resin, and the thickness in described reflection horizon is 50 μm ~ 300 μm.Be preferably 100 μm ~ 275 μm; Be more preferably 150 μm ~ 250 μm; When thickness is too high, stretcher load strengthens, and easily causes film forming to decline; When thickness is too low, speed of production is too fast, and the fault in productions such as volume film easily occur.Porosity illustrates in the present invention, and containing micropore in reflection horizon, the average-size of the fine cavity observed in the cross section cut out along length direction and the Width of film is preferably 2 μm ~ 25 μm, is more preferably 3 μm ~ 20 μm; The porosity in reflection horizon is 5% ~ 50%, is preferably 10% ~ 30%.If the average-size of fine cavity is greater than 25 μm or porosity is greater than 50%, then easily cause breaking during film forming; If the average-size of fine cavity is less than 2 μm or porosity is less than 5%, then can not obtain enough reflectivity.
In the present invention, described diffusion layer 3 is made up of diffusion particle 4 and PET.Diffusion particle can use the particles such as acrylic resin, polystyrene resin, polyurethane resin, epoxy resin, also uses the inorganic particulates such as titania, silicon dioxide, barium sulphate.Preferred use titania, silicon dioxide; Preferably use titania again.In described diffusion layer, the content of diffusion particle is 1 percentage by weight ~ 10 percentage by weight, and the thickness of described diffusion layer is 10 μm ~ 50 μm.
The preparation method of above-mentioned heat conduction reflection film, according to percentage by weight, adds diffusion particle in A extruder: 1 percentage by weight ~ 10 percentage by weight, PET:90 percentage by weight ~ 99 percentage by weight; Reflective particle is added: 20 percentage by weight ~ 70 percentage by weights, incompatible resin: 3 percentage by weight ~ 15 percentage by weights, PET:15 percentage by weight ~ 77 percentage by weight in B extruder; Conductive particle is added: 1 percentage by weight ~ 5 percentage by weight, PET:50 percentage by weight ~ 99 percentage by weight in C extruder.By the die head of A/B/C structure, adopt three-layer co-extruded method, extrude sheet from die head, through slab, two-way stretch, thermal finalization and rolling, the obtained heat conduction reflection film simultaneously with heat conduction and diffusion function.
As shown in Figure 2, heat conduction reflection film of the present invention is used in backlight source module, can reduce the consumption of diffusion barrier, to thinning, the loss of weight of backlight source module, reduces costs and plays positive role.
Below in conjunction with embodiment, the present invention will be further described, but enforcement of the present invention and protection domain are not limited to these embodiments.
Embodiment 1
Diffusion layer raw material 1kg titania, 9kgPET is added in the A layer of A/B/C tri-layers of extruder, reflection horizon raw material 0.8kg polyolefin resin, 6kg barium sulphate, 13.2kgPET is added in B layer, the alundum (Al2O3) that 0.1kg particle diameter is 0.01 μm is added, 9.9kgPET in C layer.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 70 μm, and wherein the thickness of each layer is diffusion layer: 10 μm; 50 μm, reflection horizon; Heat-conducting layer 10 μm, tests its heat-conducting effect in table 1.
Embodiment 2
Diffusion layer raw material 1kg titania, 9kgPET is added in the A layer of A/B/C tri-layers of extruder, reflection horizon raw material 1.2kg polyolefin resin, 6kg barium sulphate, 12.8kgPET is added in B layer, the aluminium nitride that 0.5kg particle diameter is 0.1 μm is added, 9.5kgPET in C layer.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 110 μm, and wherein the thickness of each layer is diffusion layer: 50 μm; 50 μm, reflection horizon; Heat-conducting layer 10 μm, tests its heat-conducting effect in table 1.
Embodiment 3
In the A layer of A/B/C tri-layers of extruder, add diffusion layer raw material 1kg titania, 9kgPET adds reflection horizon raw material 1.6kg polyolefin resin, 6kg barium sulphate, 12.4kgPET in B layer, in C layer, add the zinc paste that 1kg particle diameter is 1 μm, 9kgPET.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 185 μm, and wherein the thickness of each layer is diffusion layer: 50 μm; 100 μm, reflection horizon; Heat-conducting layer 35 μm, tests its heat-conducting effect in table 1.
Embodiment 4
In the A layer of A/B/C tri-layers of extruder, add diffusion layer raw material 1kg titania, 9kgPET, in B layer, add reflection horizon raw material 5kg polyolefin resin, 6kg barium sulphate, 9kgPET, in C layer, add the beryllia that 1.5kg particle diameter is 2 μm, 8.5kgPET.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 275 μm, and wherein the thickness of each layer is diffusion layer: 25 μm; 200 μm, reflection horizon; Heat-conducting layer 50 μm, tests its heat-conducting effect in table 1.
Embodiment 5
In the A layer of A/B/C tri-layers of extruder, add diffusion layer raw material 1kg titania, 9kgPET, in B layer, add reflection horizon raw material 3.5kg polyolefin resin, 6kg barium sulphate, 10.5kgPET, in C layer, add the silicon nitride that 2kg particle diameter is 5 μm, 8kgPET.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 345 μm, and wherein the thickness of each layer is diffusion layer: 10 μm; 300 μm, reflection horizon; Heat-conducting layer 35 μm, tests its heat-conducting effect in table 1.
Embodiment 6
In the A layer of A/B/C tri-layers of extruder, add diffusion layer raw material 1kg titania, 9kgPET, add reflection horizon raw material 2kg polyolefin resin, 6kg barium sulphate, 12kgPET in B layer, in C layer, add 3kg particle diameter is 8 μm of alundum (Al2O3)s, 7kgPET.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 150 μm, and wherein the thickness of each layer is diffusion layer: 50 μm; 50 μm, reflection horizon; Heat-conducting layer 50 μm, tests its heat-conducting effect in table 1.
Embodiment 7
Diffusion layer raw material 1kg titania, 9kgPET is added in the A layer of A/B/C tri-layers of extruder, reflection horizon raw material 2.7kg polyolefin resin, 6kg barium sulphate, 11.3kgPET is added in B layer, in C layer, add 4kg particle diameter is 10 μm of alundum (Al2O3)s, 6kgPET.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 250 μm, and wherein the thickness of each layer is diffusion layer: 20 μm; 210 μm, reflection horizon; Heat-conducting layer 20 μm, tests its heat-conducting effect in table 1.
Embodiment 8
Diffusion layer raw material 1kg titania, 9kgPET is added in the A layer of A/B/C tri-layers of extruder, reflection horizon raw material 2.3kg polyolefin resin, 6kg barium sulphate, 11.7kgPET is added in B layer, in C layer, add 5kg particle diameter is 15 μm of alundum (Al2O3)s, 5kgPET.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 225 μm, and wherein the thickness of each layer is diffusion layer: 35 μm; 170 μm, reflection horizon; Heat-conducting layer 20 μm, tests its heat-conducting effect in table 1.
Comparative example 1
In the A layer of A/B/C tri-layers of extruder, add diffusion layer raw material 1kg titania, 9kgPET, add reflection horizon raw material 6kg polyolefin resin, 6kg barium sulphate, 8kgPET in B layer, in C layer, add 6kg particle diameter is 20 μm of alundum (Al2O3)s, 4kgPET.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 400 μm, and wherein the thickness of each layer is diffusion layer: 50 μm; 300 μm, reflection horizon; Heat-conducting layer 50 μm, tests its heat-conducting effect in table 1.
Comparative example 2
In the A layer of A/B/C tri-layers of extruder, add diffusion layer raw material 1kg titania, 9kgPET, in B layer, add reflection horizon raw material 0.5kg polyolefin resin, 6kg barium sulphate, 13.5kgPET, in C layer, add 10kgPET.Above-mentioned A, B, C tri-kinds of components are sent into double screw extrusion machine, melting under 290 DEG C of conditions simultaneously.Regulate 3 extruders extrusion capacity separately, by above-mentioned three kinds of fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, eventually pass through the processes such as cooling, rolling, obtain heat conduction reflection film, this heat conduction reflection film gross thickness is 350 μm, and wherein the thickness of each layer is diffusion layer: 50 μm; 290 μm, reflection horizon; Heat-conducting layer 10 μm, tests its heat-conducting effect in table 1.
Table 1: the Performance comparision of each embodiment and comparative example
Heat conductivility method of testing is as follows:
First heat conduction reflection film is made the rectangular of the long 30cm of wide 1cm, use infrared heat source to rectangular heating one end, make it keep 85 DEG C, after 10 minutes, get the temperature of pinpoint test reflectance coating and record along heating end every 5cm with infrared tester.
As shown in Table 1, along with adding of conductive particle, on reflectance coating, the heat at local heating position conducts to each region of diaphragm fast, and film body is heated evenly; During conductive particle too high levels, the filming performance of film declines.
Film forming performance test methods is as follows:
By each embodiment fused materials by a co-extrusion die head, by melt curtain coating on a chill roll rotated, form the casting sheet of unformed A/B/C three-decker.After this casting sheet preheating, carry out longitudinal stretching multiple carry out longitudinal stretching with the multiplying power of 3.3 successively, multiplying power with 3.5 carries out cross directional stretch, by the thermal finalization under the temperature conditions of about 230 DEG C of the polymer film of two-way stretch orientation, whether can smoothly film forming, to judge the quality of filming performance if observing it.
Fine cavity aperture and porosity method of testing as follows:
The mean diameter of the section of heat conduction reflection film being carried out fine cavity in Electronic Speculum imaging section is fine cavity aperture.Porosity adopts porosity measurement instrument automatically to measure.
Claims (8)
1. a heat conduction reflection film, containing reflection horizon and diffusion layer, is characterized in that, also heat-conducting layer is provided with at the another side in reflection horizon, heat conduction reflection film is multi-layer co-extruded formation, and containing conductive particle in described heat-conducting layer, it is 1% ~ 50% that conductive particle accounts for heat-conducting layer percentage by weight.
2. heat conduction reflection film according to claim 1, is characterized in that: the particle diameter of described conductive particle is 0.01 μm ~ 15 μm.
3. heat conduction reflection film according to claim 2, is characterized in that: described conductive particle is alundum (Al2O3), aluminium nitride, zinc paste, one or more in beryllia or silicon nitride.
4. heat conduction reflection film according to claim 3, is characterized in that: described conductive particle is alundum (Al2O3).
5. heat conduction reflection film according to claim 4, is characterized in that: the thickness of described heat-conducting layer is 10 μm ~ 50 μm, and the thickness of diffusion layer is 10 μm ~ 50 μm, and the thickness in described reflection horizon is 50 μm ~ 300 μm.
6. heat conduction reflection film according to claim 5, is characterized in that: containing fine cavity in described reflection horizon, the aperture of fine cavity is 2 μm ~ 25 μm; The porosity in reflection horizon is 5% ~ 50%.
7. heat conduction reflection film according to claim 6, is characterized in that: the method that heat conduction reflection film uses A/B/C three-layer co-extruded, extrudes sheet by die head, and through slab, two-way stretch, thermal finalization and rolling obtain.
8. a backlight source module, adopt the heat conduction reflection film as described in any one of claim 1-7, it is characterized in that, described heat conduction reflection film and luminous light source, optically diffusion barrier, light guide plate, frame and prismatic lens form backlight source module jointly, described heat conduction reflection film is by reflection horizon, the three-layer thin-film of heat-conducting layer and diffusion layer co-extrusion.
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| CN106772729A (en) * | 2016-12-29 | 2017-05-31 | 吴中区穹窿山德毅新材料技术研究所 | A kind of optical reflectance coating of low-luster and the backlight module using the reflectance coating |
| CN106827689A (en) * | 2016-12-23 | 2017-06-13 | 合肥乐凯科技产业有限公司 | A kind of high reflectance reflectance coating |
| CN111730944A (en) * | 2020-07-03 | 2020-10-02 | 江苏新光镭射包装材料股份有限公司 | Anti-wrinkle silver reflective film and processing technology thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106019715A (en) * | 2016-07-29 | 2016-10-12 | 奥英光电（苏州）有限公司 | Backlight module and liquid crystal displayer |
| CN106827689A (en) * | 2016-12-23 | 2017-06-13 | 合肥乐凯科技产业有限公司 | A kind of high reflectance reflectance coating |
| CN106772729A (en) * | 2016-12-29 | 2017-05-31 | 吴中区穹窿山德毅新材料技术研究所 | A kind of optical reflectance coating of low-luster and the backlight module using the reflectance coating |
| CN111730944A (en) * | 2020-07-03 | 2020-10-02 | 江苏新光镭射包装材料股份有限公司 | Anti-wrinkle silver reflective film and processing technology thereof |
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Application publication date: 20151007 |