CN102304232B - Method for improving surface roughness of reflecting film - Google Patents
Method for improving surface roughness of reflecting film Download PDFInfo
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- CN102304232B CN102304232B CN2011101631638A CN201110163163A CN102304232B CN 102304232 B CN102304232 B CN 102304232B CN 2011101631638 A CN2011101631638 A CN 2011101631638A CN 201110163163 A CN201110163163 A CN 201110163163A CN 102304232 B CN102304232 B CN 102304232B
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Abstract
The invention discloses a method for improving the surface roughness of a reflecting film, which comprises the following steps of: (1) adding a first inducing solution to back cold air for inducing the surface of a platy melt to crystallize while cooling and curing the made platy melt by the back cold air, and obtaining a thick plate; (2) after blowing the first inducing solution on the surface of the thick plate dry, preheating the thick plate by one group of rolls, then longitudinally drawing in a quick and slow roll group, simultaneously spraying a second inducing solution on the surface of the thick plate for inducing the surface of the thick plate to crystallize again, and then making a reflecting film through a horizontal drawing procedure. In the processing and manufacture process, the surface of the reflecting film is successively induced twice to quickly produce thick and big spherulites, so that uniform brightness phenomena caused by smooth surface and partial tight contact with a light guide plate are avoided. Therefore, the brightness uniformness of a back light source and the picture quality of a liquid crystal display with the back light source are improved. The method is suitable for the reflecting film.
Description
Technical field
The present invention relates to the reflectance coating of the backlight that liquid-crystal display etc. uses, particularly relate to a kind of method that improves the reflectance coating surfaceness.
Background technology
At present, liquid-crystal display is widely used in mobile phone, GPS navigation appearance, computer, the TV etc. as display unit.And liquid-crystal display itself is not luminous, need irradiates light be provided through backlight.Generally speaking, can assemble reflectance coating in the backlight, the optical loss that causes to reduce light to leak with the back side from the side, thereby the brightness that improves indicating meter, it is very even that the reflected light of reflectance coating generation simultaneously requires, thereby bright and uniform high-quality screen is provided.
Common used reflectance coating is to add the purpose that white inorganic particles or organic filler etc. reach reflection, on this basis, develops gradually through producing the method that modes such as micropore, increase top coat improve reflectivity.But in the assembling use of backlight; Usually can be because the reflectance coating surfaceness be too low; Cause reflectance coating local too tight with the light guiding plate applying, differ and positive local light and shade occurs, brightness is more even inadequately; Being reflected in the liquid-crystal display then is problems such as the picture light and shade is uneven, and visual effect is not good.
The general method of manufacture of above-mentioned reflectance coating is following:
With polyester A layer raw material (auxiliary agents such as polyester, inorganic particulate and organic filler and oxidation inhibitor, thermo-stabilizer, photostabilizer), polyester B layer raw material (polyester, inorganic particulate, organic filler are or/and auxiliary agents such as incompatible polymer and oxidation inhibitor, thermo-stabilizers) under the temperature about 180 ℃ in advance after crystallization-drying; Mix and be delivered to forcing machine, wherein inorganic particulate is TiO
2, BaSO
4Or its mixture, organic filler is polymethyl acrylic acid, PS etc., incompatible polymer is selected from polyolefin-based resins such as Vilaterm, Vestolen PP 7052, polybutylenes, polycyclopentadiene, polymethylpentene etc.;
2. in above-mentioned forcing machine, raw material melt extrudes under the temperature about 285 ℃, and after strainer filters, from the multilayer die head, extrudes, and obtains the sheet melt;
3. above-mentioned sheet melt one side being attached to surface temperature through electrostatic adsorption device is cooling curing on the sharp cooling roll about 25 ℃, and said sheet melt another side (polyester A laminar surface) obtains sheet through back of the body cold wind cooling curing simultaneously;
4. being the roller preheating about 85 ℃ with above-mentioned sheet through one group of surface temperature, is that speed roller group about 90 ℃ is carried out longitudinal stretching in temperature then, and stretching ratio is about 3.3, obtains the uniaxial extension polyester film sheet;
5. with the above-mentioned polyester film sheet of clip clamping both sides; Import in the transverse stretching machine simultaneously; Is the preheating zone about 95 ℃ through excess temperature earlier, then about 3.0 times of cross directional stretchs in temperature is the drawing zone about 120 ℃ are that heat set zone about 200 ℃ is heat-treated through excess temperature then; Be the cooling zone cooling about 50 ℃ through excess temperature afterwards, after traction, side cut, rolling, obtaining the two-way stretch diaphragm then is reflectance coating.
Summary of the invention
The objective of the invention is provides a kind of method that improves the reflectance coating surfaceness in order to overcome the deficiency of above-mentioned background technology.
In order to realize above purpose, a kind of method that improves the reflectance coating surfaceness provided by the invention may further comprise the steps:
(1) with the sheet melt that makes in back of the body cold wind cooling curing, in back of the body cold wind, add for the first time that inducing solution carries out induced crystallization to the surface of said sheet melt, obtain sheet;
(2) above-mentioned sheet is after the surface inducing solution first time is done in wind; With one group of roller preheating of this sheet warp; And then in speed roller group, carry out longitudinal stretching; To the surface of the sheet spray inducing solution second time induced crystallization second time is carried out on the surface of sheet simultaneously, make reflectance coating through the cross directional stretch operation then.
In the such scheme; Said first time, inducing solution was a solvent for the mixture with water and terepthaloyl moietie; The mass ratio of water and terepthaloyl moietie is 4: 1～1: 1; With concentration is that the Sodium Benzoate of 1wt%～14wt%, the mikrobin that concentration is 1wt%～14wt% are the solution of solute, produces thick spherocrystal rapidly with the surface of inducing sheet.
In the such scheme, said second time, inducing solution was the mixed solvent of acetone and terepthaloyl moietie, and mass ratio is 1: 4～1: 1, produced thick spherocrystal rapidly with the surface of inducing sheet.
In the such scheme; The surface average roughness of said reflectance coating >=0.5 μ m; Like this; Avoided fitting tightly with light guiding plate and caused that light and shade differs, the phenomenon of brightness disproportionation, thereby improved the image quality of brightness uniformity with the liquid-crystal display that uses this backlight of backlight because of smooth surface is local.
In the such scheme, when the induced crystallization second time is carried out on the surface of sheet, adopt exhausting system the evaporable solvent recuperation to be utilized once more energy-conserving and environment-protective.
Reflectance coating among the present invention can add various additives according to actual needs, for example inhibitor, thermo-stabilizer, photostabilizer, uv-absorbing agent, static inhibitor, organic fine particles, inorganic particles, nucleator, fluidizer etc.
Reflectance coating among the present invention can be a kind of unstretched or uniaxial extension or biaxial stretch-formed diaphragm.For improving the thermotolerance and the mechanical property of reflectance coating, preferred stretched diaphragm.
The present invention is through in the processing and manufacturing process; Front and back induce for twice the reflectance coating surface to produce thick spherocrystal rapidly respectively; Cause that light and shade differs, the phenomenon of brightness disproportionation thereby avoided fitting tightly with light guiding plate, thereby improved the image quality of brightness uniformity with the liquid-crystal display that uses this backlight of backlight because of smooth surface is local.
The present invention and prior art contrast; Fully show that its meliority is: avoided fitting tightly with light guiding plate and caused that light and shade differs, the phenomenon of brightness disproportionation, thereby improved the image quality of brightness uniformity with the liquid-crystal display that uses this backlight of backlight because of smooth surface is local.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is made further detailed description, but this embodiment should not be construed as limitation of the present invention.
A kind of method that improves the reflectance coating surfaceness provided by the invention may further comprise the steps:
(1) with the sheet melt that makes in back of the body cold wind cooling curing, in back of the body cold wind, add for the first time that inducing solution carries out induced crystallization to the surface of said sheet melt, obtain sheet;
(2) above-mentioned sheet is after the surface inducing solution first time is done in wind; With one group of roller preheating of this sheet warp; And then in speed roller group, carry out longitudinal stretching; To the surface of the sheet spray inducing solution second time induced crystallization second time is carried out on the surface of sheet simultaneously, make reflectance coating through the cross directional stretch operation then.
Above-mentioned first time, inducing solution was for the mixture with water and terepthaloyl moietie (mass ratio 4: 1～1: 1) is a solvent, was the solution of solute with 1wt%～14wt% Sodium Benzoate, 1wt%～14wt% mikrobin.Said second time, inducing solution was the mixed solvent of acetone and terepthaloyl moietie, and mass ratio is 1: 4～1: 1.
The surface average roughness of above-mentioned reflectance coating >=0.5 μ m.When the induced crystallization second time is carried out on the surface of sheet, adopt exhausting system that the evaporable solvent recuperation is utilized once more.
Measured value shown in the embodiment and evaluation are described below and carry out.
(1) surfaceness
According to GB/T 10610-1998, adopt tracer method test profile arithmetic average error Ra.
(2) reflectance coating is applied to the effect in the backlight
Produce 24 inches reflectance coating sample; With reflectance coating sample and the light source that matches, light guiding plate, down diffusion barrier, brightness enhancement film, go up diffusion barrier and corresponding frame is assembled into backlight successively; After the energising; Observe the phenomenon whether its front has light and shade to differ, and adopt nitometer to detect 9 mean flow rate.
Embodiment 1
Polyester A layer raw material, polyester B layer raw material after preparatory crystallization-drying under the temperature about 180 ℃, are mixed and are delivered to forcing machine; Wherein, A layer raw material is 100 parts of polyester and 2wt%TiO
2Auxiliary agents such as (median size 3 μ m) and oxidation inhibitor, thermo-stabilizer, photostabilizer; B layer raw material is 100 parts of polyester and 12wt%BaSO
4(median size is 0.7 μ m, and handle through polyoxyethylene glycol on the surface), 8wt% polymethyl acid particles (median size 1.2 μ m); The 10wt% polymethylpentene, 0.01wt%2,4-dihydroxy benaophenonel and 0.01wt%4-benzoyloxy-2; 2; 6,6-tetramethyl piperidine, and auxiliary agent such as oxidation inhibitor, thermo-stabilizer.
In above-mentioned forcing machine, said raw material melt extrudes under the temperature about 285 ℃, and after strainer filters, from the multilayer die head, extrudes, and obtains the sheet melt.
Above-mentioned sheet melt one side is attached to cooling curing on the sharp cooling roll through electrostatic adsorption device; Another side is through back of the body cold wind cooling curing; In back of the body cold wind, add simultaneously the small droplets of inducing solution (containing the solution of 7wt% in the mixed solvent of water-ethylene glycol (mass ratio is 4: 1)) formation for the first time the polyester A laminar surface of said sheet melt is carried out induced crystallization, obtain sheet chlorobenzoic acid sodium and 8wt% Sodium Benzoate.
Above-mentioned sheet is after the surface inducing solution first time is done in wind; Is the roller preheating about 85 ℃ with this sheet through one group of surface temperature; Be that speed roller group about 90 ℃ is carried out longitudinal stretching in temperature then; Stretching ratio is 3.3, simultaneously to the polyester A of sheet laminar surface spray for the second time inducing solution (mixed solvent of acetone and terepthaloyl moietie, mass ratio 1: 4) the polyester A laminar surface of sheet is carried out the induced crystallization second time; And adopt exhausting system that the evaporable solvent recuperation is utilized, obtain the uniaxial extension polyester film sheet;
With the above-mentioned polyester film sheet of clip clamping both sides; Import in the transverse stretching machine simultaneously; Is the preheating zone about 95 ℃ through excess temperature earlier, then 3.0 times of cross directional stretchs in temperature is the drawing zone about 120 ℃ are that heat set zone about 200 ℃ is heat-treated through excess temperature then; Be the cooling zone cooling about 50 ℃ through excess temperature afterwards, after traction, side cut, rolling, obtaining the two-way stretch diaphragm then is reflectance coating.
Embodiment 2
Except that inducing solution for the second time changes acetone and the mixed solvent of quality of glycol than 2: 3 into, and adopt exhausting system that evaporable acetone is recycled, employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 3
The mass ratio that changes acetone and terepthaloyl moietie into except that inducing solution for the second time is that employing makes reflectance coating with embodiment 1 identical condition 1: 1 the mixed solvent.
Embodiment 4
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 4: 1) into and contain the solution of 10wt% to chlorobenzoic acid sodium and 5wt% Sodium Benzoate, employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 5
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 4: 1) into and contain the solution of 10wt% chlorobenzoic acid sodium and 5wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be outside 2: 3 the mixed solvent to inducing solution;, adopt and make reflectance coating with embodiment 1 identical condition.
Embodiment 6
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 4: 1) into and contain the solution of 10wt% chlorobenzoic acid sodium and 5wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
Embodiment 7
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 4: 1) into and contain the solution of 12wt% to chlorobenzoic acid sodium and 3wt% Sodium Benzoate, employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 8
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 4: 1) into and contain the solution of 12wt% chlorobenzoic acid sodium and 3wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 9
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 4: 1) into and contain the solution of 12wt% chlorobenzoic acid sodium and 3wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
Embodiment 10
Contain the solution of 14wt% to chlorobenzoic acid sodium and 1wt% Sodium Benzoate except that inducing solution for the first time changes in the mixed solvent of water-ethylene glycol (mass ratio is 4: 1), employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 11
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 4: 1) into and contain the solution of 14wt% chlorobenzoic acid sodium and 1wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 12
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 4: 1) into and contain the solution of 14wt% chlorobenzoic acid sodium and 1wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
The evaluation result of embodiment 1-12 is seen table 1.
Embodiment 13
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 7wt% to chlorobenzoic acid sodium and 8wt% Sodium Benzoate, employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 14
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 7wt% chlorobenzoic acid sodium and 8wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 15
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 7wt% chlorobenzoic acid sodium and 8wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
Embodiment 16
Contain the solution of 10wt% to chlorobenzoic acid sodium and 5wt% Sodium Benzoate except that inducing solution for the first time changes in the mixed solvent of water-ethylene glycol (mass ratio is 3: 2), employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 17
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 10wt% chlorobenzoic acid sodium and 5wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 18
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 10wt% chlorobenzoic acid sodium and 5wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
Embodiment 19
Contain the solution of 12wt% to chlorobenzoic acid sodium and 3wt% Sodium Benzoate except that inducing solution for the first time changes in the mixed solvent of water-ethylene glycol (mass ratio is 3: 2), employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 20
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 12wt% chlorobenzoic acid sodium and 3wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 21
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 12wt% chlorobenzoic acid sodium and 3wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
Embodiment 22
Contain the solution of 14wt% to chlorobenzoic acid sodium and 1wt% Sodium Benzoate except that inducing solution for the first time changes in the mixed solvent of water-ethylene glycol (mass ratio is 3: 2), employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 23
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 14wt% chlorobenzoic acid sodium and 1wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 24
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 3: 2) into and contain the solution of 14wt% chlorobenzoic acid sodium and 1wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
The evaluation result of embodiment 13-24 is seen table 2.
Embodiment 25
Contain the solution of 7wt% to chlorobenzoic acid sodium and 8wt% Sodium Benzoate except that inducing solution for the first time changes in the mixed solvent of water-ethylene glycol (mass ratio is 1: 1), employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 26
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 1: 1) into and contain the solution of 7wt% chlorobenzoic acid sodium and 8wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 27
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 1: 1) into and contain the solution of 7wt% chlorobenzoic acid sodium and 8wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
Embodiment 28
Contain the solution of 10wt% to chlorobenzoic acid sodium and 5wt% Sodium Benzoate except that inducing solution for the first time changes in the mixed solvent of water-ethylene glycol (mass ratio is 1: 1), employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 29
Remove in the mixed solvent that inducing solution for the first time changes water monoethylene glycol (mass ratio is 1: 1) into and contain the solution of 10wt% chlorobenzoic acid sodium and 5wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 30
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 1: 1) into and contain the solution of 10wt% chlorobenzoic acid sodium and 5wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
Embodiment 31
Contain the solution of 12wt% to chlorobenzoic acid sodium and 3wt% Sodium Benzoate except that inducing solution for the first time changes in the mixed solvent of water-ethylene glycol (mass ratio is 1: 1), employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 32
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 1: 1) into and contain the solution of 12wt% chlorobenzoic acid sodium and 3wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 33
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 1: 1) into and contain the solution of 12wt% chlorobenzoic acid sodium and 3wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
Embodiment 34
Contain the solution of 14wt% to chlorobenzoic acid sodium and 1wt% Sodium Benzoate except that inducing solution for the first time changes in the mixed solvent of water-ethylene glycol (mass ratio is 1: 1), employing makes reflectance coating with embodiment 1 identical condition.
Embodiment 35
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 1: 1) into and contain the solution of 14wt% chlorobenzoic acid sodium and 1wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 2: 3 the mixed solvent to inducing solution.
Embodiment 36
Remove in the mixed solvent that inducing solution for the first time changes water-ethylene glycol (mass ratio is 1: 1) into and contain the solution of 14wt% chlorobenzoic acid sodium and 1wt% Sodium Benzoate; For the second time to change the mass ratio of acetone and terepthaloyl moietie into be that employing makes reflectance coating with embodiment 1 identical condition outside 1: 1 the mixed solvent to inducing solution.
The evaluation result of embodiment 25-36 is seen table 3.
Comparative example 1
Inducing solution carries out the induced crystallization diaphragm except that not adopting for the first time, adopts and makes reflectance coating with embodiment 1 identical condition.
Comparative example 2
Inducing solution is with inducing solution is to the diaphragm induced crystallization for the second time for the first time except that not adopting, and employing makes reflectance coating with embodiment 1 identical condition.
Comparative example 1 and 2 evaluation result are seen table 4.
Table 1
| Profile arithmetic average error Ra | The back light source brightness uniformity coefficient |
| (μm) | (％) | |
| Embodiment 1 | 0.5 | 85.3 |
| Embodiment 2 | 0.7 | 85.5 |
| Embodiment 3 | 0.6 | 86.5 |
| Embodiment 4 | 0.6 | 86.3 |
| Embodiment 5 | 0.8 | 87.0 |
| Embodiment 6 | 0.6 | 86.7 |
| Embodiment 7 | 1.0 | 89.0 |
| Embodiment 8 | 1.2 | 90.5 |
| Embodiment 9 | 1.0 | 89.2 |
| Embodiment 10 | 0.8 | 87.3 |
| Embodiment 11 | 0.9 | 87.8 |
| Embodiment 12 | 0.7 | 85.1 |
Table 2
Table 3
Table 4
Can know through above embodiment and comparative example; In the reflectance coating course of processing; Reflectance coating is at least simultaneously adopted Solvent Induced Crystallization roughening treatment technology; Improved surfaceness, this reflectance coating is applied in effectively to avoid in the backlight fitting tightly with light guiding plate because of smooth surface is local and causes that light and shade differs, the phenomenon of brightness disproportionation.The water-ethylene glycol mass ratio is in 4: 1～1: 1 scope in first inducing solution, and in 1wt%～14wt% scope, Sodium Benzoate content is in 1wt%～14wt% scope to the chlorobenzoic acid sodium content; For the second time the mass ratio of acetone and terepthaloyl moietie is in 4: 1～1: 1 scope in the inducing solution, and reflectance coating can obtain high surfaceness.
Reflectance coating of the present invention; Because there is certain roughness on the surface; Be applied in to avoid in the backlight fitting tightly with light guiding plate and cause that light and shade differs, the phenomenon of brightness disproportionation, thereby can improve the image quality of brightness uniformity with the liquid-crystal display that uses this backlight of backlight because of smooth surface is local.
Claims (3)
1. a method that improves the reflectance coating surfaceness is characterized in that, may further comprise the steps:
(1) with the sheet melt that makes in back of the body cold wind cooling curing, in back of the body cold wind, add for the first time that inducing solution carries out induced crystallization to the surface of said sheet melt, obtain sheet;
(2) above-mentioned sheet is after the surface inducing solution first time is done in wind; With one group of roller preheating of this sheet warp; And then in speed roller group, carry out longitudinal stretching; To the surface of the sheet spray inducing solution second time induced crystallization second time is carried out on the surface of sheet simultaneously, make reflectance coating through the cross directional stretch operation then;
Said first time, inducing solution was a solvent for the mixture with water and terepthaloyl moietie, and the mass ratio of water and terepthaloyl moietie is 4: 1～1: 1, is that the Sodium Benzoate of 1wt%～14wt%, the mikrobin that concentration is 1wt%～14wt% are the solution of solute with concentration;
Said second time, inducing solution was the mixed solvent of acetone and terepthaloyl moietie, and mass ratio is 1: 4～1: 1.
2. a kind of method that improves the reflectance coating surfaceness as claimed in claim 1 is characterized in that: the surface average roughness of said reflectance coating >=0.5 μ m.
3. a kind of method that improves the reflectance coating surfaceness as claimed in claim 1 is characterized in that: when the induced crystallization second time is carried out on the surface of sheet, adopt exhausting system that the evaporable solvent recuperation is utilized once more.
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