CN102848587A - Method for preparing reflective film with light diffusion effect on surface - Google Patents
Method for preparing reflective film with light diffusion effect on surface Download PDFInfo
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- CN102848587A CN102848587A CN201110182338XA CN201110182338A CN102848587A CN 102848587 A CN102848587 A CN 102848587A CN 201110182338X A CN201110182338X A CN 201110182338XA CN 201110182338 A CN201110182338 A CN 201110182338A CN 102848587 A CN102848587 A CN 102848587A
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Abstract
The invention relates to a method for preparing reflective film with light diffusion effect on surface. The method includes sending polyester chip subjected to fluidization treatment to drying tower for drying, sending the polyester chip to T-shaped die head via a fuse pipe, a rough filter, a metering pump and a fine filter to extrude slab, subjecting the prepared slab to longitudinal stretching to form polyester film, uniformly coating adhesive containing light diffusion agent on both surfaces of the polyester film, performing lateral stretching, then performing thermoforming, drying and curing the coating layer, wind-cooling, and rolling to obtain the reflective film. The invention can reduce manufacture cost, and the prepared reflective film has better mechanical strength and higher reflectivity.
Description
Technical field
The present invention relates to the reflectance coating preparation method that a kind of surface has the light diffusion effect, belong to the reflectance coating technical field in the liquid crystal display backlight module.
Background technology
In recent years, all used in a large number reflectance coating in liquid crystal display reflector, projection in projection screen, flat light source parts and lighting reflection plate field.For example, in liquid crystal display reflector, must ask from the large picture of device and the High Level of display performance, in order light as much as possible to be offered liquid crystal display to improve the performance of backlight, require the reflectance coating of highly reflective.
As reflectance coating, material is generally PET (polyethylene terephthalate, PET) or Merlon (polycarbonate, PC), by adding inorganics filled thing particle or incompatible polymer particle, and with its stretching masking.When stretching, form micro air bubble between incompatible polymer particle or inorganic particulate and the polyester, these micro air bubbles can play the effect of light scattering, the complete whitening that can make by this method, the reflectance coating of high reflectance.
In addition, in backlight of LCD, spot light or line source need to be atomized into uniform area source.Therefore, reflectance coating not only needs very high reflectivity, also to as much as possible incident ray be reflected away with irreflexive form, with the briliancy that improves panel of LCD and control brightness evenly.This will ask the reflectance coating surface to have certain light diffusion.
Present making for reflectance coating, a kind ofly be take PET as major ingredient and add inorganics filled thing particle or incompatible polymer particle, through melt extrude, filtration and slab, and this slab is the trilamellar membrane sheet, the trilamellar membrane sheet is carried out vertical or horizontal stretching, make reflectance coating.Need to add more inorganics filled thing particle or incompatible polymer particle in the raw material at this reflectance coating middle part, therefore can't take into account the intensity of diaphragm and improve reflexive problem.For this reason, some reflectance coatings be first with PET through melt extrude, filtration and slab, sheet is carried out forming diaphragm after the vertical or horizontal stretching, the material that reflectivity is high is coated in the diaphragm two sides again.Because the gross thickness of polyester film sheet is controlled at below the 0.25mm, therefore in coating procedure, tension force and coating power in the time of need to controlling preferably the polyester film sheet operation, otherwise easily cause diaphragm inhomogeneous because of tension force in the operation coating procedure, on the one hand the diaphragm yield rate is not fallen, and can cause the inhomogeneous of coating on the other hand yet and affects reflecting effect.Moreover this processing method is had relatively high expectations to the diaphragm processing technology, owing to increased technological process, can increase manufacturing cost.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can reduce manufacturing cost, can take into account the mechanical strength of diaphragm and the surface of reflectivity and have the reflectance coating preparation method of light diffusion effect.
The present invention is that the technical scheme that achieves the above object is: a kind of surface has the reflectance coating preparation method of light diffusion effect, it is characterized in that: carry out according to the following steps,
(1), polyester slice is sent into the storehouse that feeds intake, send in the fluid bed after removing metallic foreign body through metal detector, fluidized-bed temperature is controlled at 180 ± 5 ℃, and polyester slice is carried out fluidization treatment;
(2), the polyester slice after the fluidization treatment is sent in the drying tower, the drying tower temperature was controlled at 160 ± 10 ℃, to dry 4-6 hour of polyester slice;
(3), dried polyester slice is delivered to the inherent 270-290 ℃ of temperature melting of extruder, melt is delivered to T-shaped die head through melt pipe, coarse filter, measuring pump and fine filter;
(4), melt extrudes the formation sheet from T-shaped die head, the T-shaped die head temperature when extruding sheet is controlled at 280～295 ℃, at 14-20 ℃ slab roller and cold wind sheet is cooled off slab with temperature, the speed of slab roller is controlled at 9.9m/min ± 1;
(5), the sheet that makes is carried out preheating through the roller of 60～80 ℃ of temperature, enter in 110～150 ℃ the infrared heater and heat, and with the linear velocity, 3.2～4.5 of 0.2m/s～1.1m/s: carry out longitudinal stretching under 1 the longitudinal stretching multiplying power and form mylar sheet, the mylar sheet longitudinal stretching time is less than 0.5s;
The adhesive that (6), will contain light diffusing agent evenly is coated in the mylar sheet two sides behind the longitudinal stretching, mylar sheet is sent in the heating cabinet to carry out preheating under 100～150 ℃ the temperature, time is controlled at 10～60s, again 110～160 ℃ temperature, 4.5～5.0: carry out cross directional stretch under 1 the cross directional stretch multiplying power, time is controlled at 10～60s, then under 190～230 ℃ condition, carry out thermal finalization and coat and carry out the baking and curing processing, processing time is 10～60s, makes reflectance coating through air-cooled cooling rolling again.
After the present invention carries out longitudinal stretching with mylar sheet first, and the adhesive that will contain light diffusing agent before cross directional stretch evenly is coated in the mylar sheet two sides behind the longitudinal stretching, in the horizontal drawing process of mylar sheet, coat is evenly scattered and solidify processing by drying and combine closely on the mylar sheet two sides, the present invention with coat with carrying out dry solidification in the horizontal propagation process of mylar sheet, can guarantee that coat evenly is attached to the mylar sheet surface reliably with the distortion of mylar sheet, solved in the coating processes process because of the uneven problem that causes the coating inequality of diaphragm tension force, make the surface of mylar sheet have higher reflectivity, simultaneously also improving the product yield falls, reduce technological process, made this one-tenth and reduce.The present invention with mylar sheet as base material, can satisfy the requirement of mechanical strength of diaphragm, by the coat on mylar sheet two sides, reflectance coating can be reflected away incident ray as much as possible with irreflexive form simultaneously, make reflectance coating have excellent light reflective properties.
Description of drawings
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
Fig. 1 is the present invention tests the back reflection rate to each reflectance coating curve map.
The specific embodiment
The reflectance coating preparation method that surface of the present invention has the light diffusion effect carries out according to the following steps,
(1), polyester slice is sent into the storehouse that feeds intake, send in the fluid bed after removing metallic foreign body through metal detector, fluidized-bed temperature is controlled at 180 ± 5 ℃, and polyester slice is carried out fluidization treatment, can be controlled in 175 ℃ such as fluidized-bed temperature, is preferably in 180 ± 2 ℃,
(2), the polyester slice after the fluidization treatment is sent in the drying tower, the drying tower temperature is controlled at 160 ± 10 ℃, and to dry 4-6 hour of polyester slice, best, dry tower temperature was controlled at 160 ± 5 ℃, and polyester slice is controlled at 4.5-5 hour drying time,
(3), dried polyester slice is delivered to the inherent 270-290 ℃ of temperature melting of extruder, melt is delivered to T-shaped die head through melt pipe, coarse filter, measuring pump and fine filter, and this temperature preferably is controlled at 275-285 ℃,
(4), melt is extruded the formation sheet from T-shaped die head, T-shaped die head temperature when extruding sheet is controlled at 280～295 ℃, at 14-20 ℃ slab roller and cold wind sheet is cooled off slab with temperature, the speed of slab roller is controlled at 9.9m/min ± 1m/min, T-shaped die head temperature when extruding sheet preferably is controlled at 285～290 ℃, the slab temperature is at 15-18 ℃, and the speed of slab roller is controlled at 9.9m/min ± 0.6m/min
(5), the sheet that makes is carried out preheating through the roller of 60～80 ℃ of temperature, enter in 110～150 ℃ the infrared heater and heat, and with the linear velocity of 0.2m/s～1.1m/s, carry out longitudinal stretching under 3.2～4.5: 1 the longitudinal stretching multiplying power and form mylar sheet, the mylar sheet longitudinal stretching time is less than 0.5s, preferably sheet carries out preheating through the roller of 70～75 ℃ of temperature, enter in 130～140 ℃ the infrared heater and heat, and with the linear velocity of 0.5m/s～0.8m/s, carry out longitudinal stretching under 3.5～3.8: 1 the longitudinal stretching multiplying power and form mylar sheet
(6), the adhesive that will contain light diffusing agent evenly is coated in the mylar sheet two sides behind the longitudinal stretching, mylar sheet is sent in the heating cabinet to carry out preheating under 100～150 ℃ the temperature, time is controlled at 10～60s, again 110～160 ℃ temperature, carry out cross directional stretch under 4.5～5.0: 1 the cross directional stretch multiplying power, time is controlled at 10～60s, then under 190～230 ℃ condition, carry out thermal finalization and coat and carry out the baking and curing processing, processing time is 10～60s, make reflectance coating through air-cooled cooling rolling again, preferably mylar sheet in heating cabinet to carry out preheating under 130～150 ℃ the temperature, time is controlled at 40～50s, again 120～150 ℃ temperature, carry out cross directional stretch under 4.7～4.8: 1 the cross directional stretch multiplying power, time is controlled at 30～50s, then under 210～220 ℃ condition, carry out thermal finalization and coat and carry out the baking and curing processing, processing time is 40～50s, more than 95%, so the reflectance coating surface has better light diffusion effect to incident ray to the coat that makes with respect to the light reflectivity of 500～650nm wave band.
The present invention can adopt existing polyester slice, or a small amount of antistatic additive of adding in this polyester slice, the ratio of quality and the number of copies 0.5～10: 100 of this antistatic additive and PETG, and the adhesive that contains light diffusing agent is the polymer that contains the polystyrene crosslinked microsphere, the glass transition temperature of adhesive is 50-80 ℃, this polymer composition contains polyalcohol, as select dual-component polyurethane class adhesive, press the curing agent (PC2000) of 200 parts of PEPAs of ratio of quality and the number of copies (PC5000) and 20 parts, or monocomponent polyurethane class adhesive, such as PU-94-116, also can adopt urea-formaldehyde resin adhesive, such as MUF-J20) or epoxy resin adhesive etc., also can contain a small amount of light stabilizer in this adhesive, light stabilizer can adopt such as tetraethyl-2,2 '-(1, the inferior stupid base of 4--two-methine)-the dimalonic acid ester, malonic acid [(4-methoxyphenyl)-methylene]-dimethyl esters, the 2-ethyl, 2 '-the ethyoxyl oxalyl is for stupid amine, NDA etc.
Embodiment 1
(1), polyester slice is sent into the storehouse that feeds intake, send in the fluid bed after removing metallic foreign body through metal detector, fluidized-bed temperature is controlled at 180 ℃, and polyester slice is carried out fluidization treatment;
(2), the polyester slice after the fluidization treatment is sent in the drying tower, the drying tower temperature was controlled at 170 ℃, to dry 6 hours of polyester slice;
(3), dried polyester slice is delivered to the inherent 270 ℃ of temperature meltings of extruder, melt is delivered to T-shaped die head through melt pipe, coarse filter, measuring pump and fine filter;
(4), melt extrudes the formation sheet from T-shaped die head, the T-shaped die head temperature when extruding sheet is controlled at 285 ℃, at 20 ℃ slab roller and cold wind sheet is cooled off slab with temperature, the speed of slab roller is controlled at 9.9m/min;
(5), the sheet that makes is carried out preheating through the roller of 65 ℃ of temperature, enter in 115 ℃ the infrared heater and heat, and forming mylar sheet to carry out longitudinal stretching under the linear velocity of 0.3m/s, 4.5: 1 the longitudinal stretching multiplying power, the mylar sheet longitudinal stretching time is controlled at 0.4s;
(6), the adhesive that will contain light diffusing agent evenly is coated in the mylar sheet two sides behind the longitudinal stretching, mylar sheet is sent in the heating cabinet to carry out preheating under 110 ℃ the temperature, time is controlled at 20s, again 100 ℃ temperature, 4.6: carry out cross directional stretch under 1 the cross directional stretch multiplying power, time is controlled at 20s, then under 200 ℃ condition, carry out thermal finalization and coat and carry out the baking and curing processing, processing time is 60s, make reflectance coating through air-cooled cooling rolling again, this reflectance coating is sample 1, more than 95%, the reflectance coating surface has better light diffusion effect to incident ray to coat on the reflectance coating with respect to the light reflectivity of 500～650nm wave band.
Embodiment 2
(1), polyester slice is sent into the storehouse that feeds intake, send in the fluid bed after removing metallic foreign body through metal detector, fluidized-bed temperature is controlled at 178 ℃, and polyester slice is carried out fluidization treatment;
(2), the polyester slice after the fluidization treatment is sent in the drying tower, the drying tower temperature was controlled at 165 ℃, to dry 4.5 hours of polyester slice;
(3), dried polyester slice is delivered to the inherent 280 ℃ of temperature meltings of extruder, melt is delivered to T-shaped die head through melt pipe, coarse filter, measuring pump and fine filter;
(4), melt extrudes the formation sheet from T-shaped die head, the T-shaped die head temperature when extruding sheet is controlled at 293 ℃, at 18 ℃ slab roller and cold wind sheet is cooled off slab with temperature, the speed of slab roller is controlled at 9.5m/min;
(5), the sheet that makes is carried out preheating through the roller of 70 ℃ of temperature, enter in 130 ℃ the infrared heater and heat, and forming mylar sheet to carry out longitudinal stretching under the linear velocity of 0.5m/s, 3.8: 1 the longitudinal stretching multiplying power, the mylar sheet longitudinal stretching time is controlled at 0.3s;
(6), the adhesive that will contain light diffusing agent evenly is coated in the mylar sheet two sides behind the longitudinal stretching, mylar sheet is sent in the heating cabinet to carry out preheating under 130 ℃ the temperature, time is controlled at 50s, again 120 ℃ temperature, 4.7: carry out cross directional stretch under 1 the cross directional stretch multiplying power, time is controlled at 50s, then under 220 ℃ condition, carry out thermal finalization and coat and carry out the baking and curing processing, processing time is 50s, make reflectance coating through air-cooled cooling rolling again, this reflectance coating is sample 2, more than 95%, the reflectance coating surface has better light diffusion effect to incident ray to coat on the reflectance coating with respect to the light reflectivity of 500～650nm wave band.
Embodiment 3
(1), polyester slice is sent into the storehouse that feeds intake, send in the fluid bed after removing metallic foreign body through metal detector, fluidized-bed temperature is controlled at 182 ℃, and polyester slice is carried out fluidization treatment;
(2), the polyester slice after the fluidization treatment is sent in the drying tower, the drying tower temperature was controlled at 160 ℃, to dry 5 hours of polyester slice;
(3), dried polyester slice is delivered to the inherent 285 ℃ of temperature meltings of extruder, melt is delivered to T-shaped die head through melt pipe, coarse filter, measuring pump and fine filter;
(4), melt extrudes the formation sheet from T-shaped die head, the T-shaped die head temperature when extruding sheet is controlled at 290 ℃, at 15 ℃ slab roller and cold wind sheet is cooled off slab with temperature, the speed of slab roller is controlled at 10.5m/min;
(5), the sheet that makes is carried out preheating through the roller of 75 ℃ of temperature, enter in 140 ℃ the infrared heater and heat, and forming mylar sheet to carry out longitudinal stretching under the linear velocity of 0.8m/s, 3.8: 1 the longitudinal stretching multiplying power, the mylar sheet longitudinal stretching time is controlled at 0.45s;
(6), the adhesive that will contain light diffusing agent evenly is coated in the mylar sheet two sides behind the longitudinal stretching, mylar sheet is sent in the heating cabinet to carry out preheating under 140 ℃ the temperature, time is controlled at 40s, again 150 ℃ temperature, 4.8: carry out cross directional stretch under 1 the cross directional stretch multiplying power, time is controlled at 30s, then under 210 ℃ condition, carry out thermal finalization and coat and carry out the baking and curing processing, processing time is 40s, make reflectance coating through air-cooled cooling rolling again, this reflectance coating is sample 3, more than 96%, the reflectance coating surface has better light diffusion effect to incident ray to coat on the reflectance coating with respect to the light reflectivity of 500～650nm wave band.
Embodiment 4
(1), polyester slice is sent into the storehouse that feeds intake, send in the fluid bed after removing metallic foreign body through metal detector, fluidized-bed temperature is controlled at 185 ℃, and polyester slice is carried out fluidization treatment;
(2), the polyester slice after the fluidization treatment is sent in the drying tower, the drying tower temperature was controlled at 150 ℃, to dry 4 hours of polyester slice;
(3), dried polyester slice is delivered to the inherent 290 ℃ of temperature meltings of extruder, melt is delivered to T-shaped die head through melt pipe, coarse filter, measuring pump and fine filter;
(4), melt extrudes the formation sheet from T-shaped die head, the T-shaped die head temperature when extruding sheet is controlled at 295 ℃, at 14 ℃ slab roller and cold wind sheet is cooled off slab with temperature, the speed of slab roller is controlled at 8.9m/min;
(5), the sheet that makes is carried out preheating through the roller of 80 ℃ of temperature, enter in 150 ℃ the infrared heater and heat, and forming mylar sheet to carry out longitudinal stretching under the linear velocity of 1.1m/s, 3.2: 1 the longitudinal stretching multiplying power, the mylar sheet longitudinal stretching time is controlled at 0.2s;
(6), the adhesive that will contain light diffusing agent evenly is coated in the mylar sheet two sides behind the longitudinal stretching, mylar sheet is sent in the heating cabinet to carry out preheating under 150 ℃ the temperature, time is controlled at 30s, again 160 ℃ temperature, 5.0: carry out cross directional stretch under 1 the cross directional stretch multiplying power, time is controlled at 60s, then under 230 ℃ condition, carry out thermal finalization and coat and carry out the baking and curing processing, processing time is 10s, make reflectance coating through air-cooled cooling rolling again, this reflectance coating is sample 4, more than 96%, the reflectance coating surface has better light diffusion effect to incident ray to this reflectance coating coat with respect to the light reflectivity of 500～650nm wave band.
Make its performance indications of reflectance coating with the present invention and see Table 1 and shown in Figure 1, not only have preferably laterally (MD) and the vertically elongation at break of (TD) hot strength, horizontal (MD) and vertical (TD), laterally (MD) and vertically change in size and the density of (TD), its reflectance test result is more than 96%.
Table 1
Claims (1)
1. a surface has the reflectance coating preparation method of light diffusion effect, it is characterized in that: carry out according to the following steps,
(1), polyester slice is sent into the storehouse that feeds intake, send in the fluid bed after removing metallic foreign body through metal detector, fluidized-bed temperature is controlled at 180 ± 5 ℃, and polyester slice is carried out fluidization treatment;
(2), the polyester slice after the fluidization treatment is sent in the drying tower, the drying tower temperature was controlled at 160 ± 10 ℃, to dry 4-6 hour of polyester slice;
(3), dried polyester slice is delivered to the inherent 270-290 ℃ of temperature melting of extruder, melt is delivered to T-shaped die head through melt pipe, coarse filter, measuring pump and fine filter;
(4), melt extrudes the formation sheet from T-shaped die head, the T-shaped die head temperature when extruding sheet is controlled at 280～295 ℃, at 14-20 ℃ slab roller and cold wind sheet is cooled off slab with temperature, the speed of slab roller is controlled at 9.9m/min ± 1m/min;
(5), the sheet that makes is carried out preheating through the roller of 60～80 ℃ of temperature, enter again in 110～150 ℃ the infrared heater and heat, and with the linear velocity, 3.2～4.5 of 0.2m/s～1.1m/s: carry out longitudinal stretching under 1 the longitudinal stretching multiplying power and form mylar sheet, the longitudinal stretching time of mylar sheet is less than 0.5s;
The adhesive that (6), will contain light diffusing agent evenly is coated in the mylar sheet two sides behind the longitudinal stretching, mylar sheet is sent in the heating cabinet to carry out preheating under 100～150 ℃ the temperature, time is controlled at 10～60s, again 110～160 ℃ temperature, 4.5～5.0: carry out cross directional stretch under 1 the cross directional stretch multiplying power, time is controlled at 10～60s, then under 190～230 ℃ condition, carry out thermal finalization and coat and carry out the baking and curing processing, processing time is 10～60s, makes reflectance coating through air-cooled cooling rolling again.
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| CN201110182338.XA CN102848587B (en) | 2011-06-30 | 2011-06-30 | Method for preparing reflective film with light diffusion effect on surface |
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| CN201110182338.XA CN102848587B (en) | 2011-06-30 | 2011-06-30 | Method for preparing reflective film with light diffusion effect on surface |
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Cited By (2)
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| CN103434107A (en) * | 2013-08-28 | 2013-12-11 | 山东胜通集团股份有限公司 | Automatic control type optical polyester film crystallization and drying system |
| CN109177245A (en) * | 2018-06-19 | 2019-01-11 | 嘉兴市汇华光学科技有限公司 | A kind of reflection film production process |
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| CN101812220A (en) * | 2010-03-02 | 2010-08-25 | 江苏工业学院 | Light diffusion agent mother material used for light diffusion film, preparation method and application thereof |
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| CN101628470A (en) * | 2008-07-18 | 2010-01-20 | 株式会社Jiro企业策划 | Base sheet for optical sheet and method for manufacturing optical sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103434107A (en) * | 2013-08-28 | 2013-12-11 | 山东胜通集团股份有限公司 | Automatic control type optical polyester film crystallization and drying system |
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| CN109177245A (en) * | 2018-06-19 | 2019-01-11 | 嘉兴市汇华光学科技有限公司 | A kind of reflection film production process |
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| CN102848587B (en) | 2015-05-13 |
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