CN111562636B - Heat-bondable optical reflecting film and preparation method thereof - Google Patents
Heat-bondable optical reflecting film and preparation method thereof Download PDFInfo
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- CN111562636B CN111562636B CN202010289456.XA CN202010289456A CN111562636B CN 111562636 B CN111562636 B CN 111562636B CN 202010289456 A CN202010289456 A CN 202010289456A CN 111562636 B CN111562636 B CN 111562636B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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Abstract
The invention discloses a heat-bondable optical reflecting film and a preparation method thereof, wherein the reflecting film comprises a heat-bondable layer and an optical reflecting layer, and the preparation method of the reflecting film comprises the following steps: mixing PET, a foaming agent, an inorganic pigment, a fluorescent whitening agent and an antioxidant to prepare a white color master batch; drying and pretreating the master batch, and sending the master batch into a core layer extruder for melt extrusion, wherein the temperature of the extruder is set at 260-290 ℃; the surface layer melt and the core layer melt are converged at a clothes hanger die head, electrostatically adsorbed and attached to a casting sheet roller to form a solid thick sheet; longitudinally stretching and transversely stretching the thick sheet, wherein the total surface stretching ratio is 6-12 times; the film after the biaxial stretching is subjected to heat setting treatment at the temperature of 220-250 ℃, and then the required reflective film is prepared after edge cutting and rolling, so that the problem of thermal deformation of the reflective film can be inhibited, a secondary coating process is avoided, the cost is reduced, and the operability is good.
Description
Technical Field
The invention relates to a reflecting film and a preparation method thereof, in particular to a heat-bondable optical reflecting film and a preparation method thereof, belonging to the field of thin-film chemical fibers.
Background
Liquid Crystal Display (LCD) is the most common display technology at present, and will be the mainstream technology of display in the next 20-30 years, liquid crystal is a substance between solid and liquid state, and cannot emit light by itself, and the display function can be achieved only by means of backlight source, and the quality of backlight source performance directly affects the display quality of LCD, especially the brightness of backlight source, and the brightness of LCD directly.
The liquid crystal backlight system mainly comprises a light source, a light guide plate and various optical films, and has the characteristics of high brightness, long service life and uniform light emission. At present, three types of backlight sources, namely EL, CCFL and LED, are mainly used, and are divided into an edge type backlight source and a direct type backlight source according to the same rule of light source distribution, and as LCD modules are continuously developed in the directions of being brighter, lighter and thinner, the edge type CCFL backlight source becomes the mainstream of the development of the backlight source at present.
The main optical film of the liquid crystal backlight system comprises a diffusion film, a brightness enhancement film and a reflection film, wherein the reflection film is mainly used for reflecting light rays leaked out of the bottom of the light guide plate in a high-efficiency and lossless manner, so that the light loss can be reduced, the power consumption can be reduced, and the liquid crystal display surface saturation can be provided. In the side-in type liquid crystal display backlight module, the reflective film is directly arranged between the metal back plate and the light guide plate, and in the direct type liquid crystal display backlight module, the perforated reflective film is arranged between the metal back plate and the light bar and is pressed on the metal back plate by the light bar.
However, when the current reflective film is used, due to uneven heating, irregular shrinkage and deformation can occur during the use process, which causes uneven reflected light, and the quality problem of uneven brightness can be seen on the front surface of the display. One possible solution is to attach the reflective film to the metal back plate or the light guide plate, and to suppress the thermal deformation of the reflective film by means of the higher stiffness of the metal back plate or the light guide plate itself. However, since the melting point of the common polyester is as high as about 260 ℃, it is not practical to thermally bond the reflective film to the metal back plate or the light guide plate at such a high temperature, which causes inconvenience in operation. To solve this problem, glue may be applied to the surface of the reflective film and bonded integrally to the metal back plate to suppress thermal deformation of the reflective film. However, this increases the cost and also reduces the yield due to the addition of glue and processing.
The method adopted by the scheme is that a multilayer co-extrusion technology is adopted, and the copolyester with the low melting point is used on one or two surfaces of the reflecting film, so that the reflecting film can be directly thermally bonded on a metal back plate or a light guide plate, thereby inhibiting the deformation problem of the reflecting film caused by heating.
Disclosure of Invention
In order to overcome the defect that the existing process can not manufacture the reflecting film with the function of low-temperature heat bonding, the invention provides the heat-bondable optical reflecting film and the preparation method thereof, wherein the heat-bondable optical reflecting film has the technical characteristics of capability of inhibiting the heat deformation of the reflecting film, simple process, low cost, good operability and the like.
The reflective film is prepared by adopting a multi-layer co-extrusion method, one extruder is used for a core layer of the reflective film, one or two extruders can be used for two surface layers of the reflective film according to requirements, and raw materials of the two surface layer extruders can be the same or different.
Since polyesters are susceptible to hydrolysis at high temperatures, all raw materials should be sufficiently dried before entering the extruder, but if a twin screw vented extruder is used, the drying process may be eliminated. It should be noted that, for the drying of the copolyester, a drum drying hot device should be selected, because the crystallization speed of the copolyester is slow, and if a boiling bed type drying device is adopted, the copolyester chips can enter a drying tower under the condition of insufficient crystallization, so that the drying tower is easy to agglomerate, the material is blocked, and the production is stopped.
One or two surfaces of the reflecting film use low-melting point copolyester, the melting point of the low-melting point copolyester is between 110-140 ℃, the low-melting point copolyester is that in the manufacturing process of polyester, a third or fourth monomer is added into an original polyester reactant to destroy the crystallization property of the original polyester, and the third or fourth monomer can be dibasic acid or dihydric alcohol; if the dibasic acid is used, it may be isophthalic acid, phthalic acid, 2, 6-naphthalenedicarboxylic acid, etc.; if the diol is used, it may be propylene glycol, butylene glycol, 1, 4-Cyclohexanedimethanol (CHDM), or the like.
The thickness of the surface layer of the reflecting film is between 5um and 40um, if the thickness is too thin, the adhesive force of thermal bonding is poor, and if the thickness is too thick, the cost is increased too much.
The surface layer of the reflective film may be added with anti-blocking additives for processing according to the circumstances, the anti-blocking additives may be organic particles such as polysiloxane, polymethyl methacrylate, polyurethane microspheres, etc., or inorganic particles such as silica, calcium carbonate, titanium dioxide, barium sulfate, etc., the size of which is generally between 0.5um and 5um, and generally, the content of the anti-blocking additives in the surface layer is between 500 and 2000 ppm.
The core layer of the reflective film is generally a mixture containing inorganic pigment, foaming agent, dispersant, fluorescent whitening agent, antioxidant and polyester, wherein the inorganic pigment can be TiO2，BaSO4、CaCO3Etc. the particle size should be 1-500nm, further, if TiO is selected2Preferably, rutile type is used, and the high-temperature foaming agent may be selected from physical foaming agents and chemical foaming agents, or polyolefin polymers incompatible with polyester, such as polyethylene, polypropylene, polypentene, cyclic polyolefin, polymethylpentene, etc., if the high-temperature foaming agent is a physical foaming agent; as the chemical foaming agent, trihydrazinotriazine, p-toluenesulfonyl semicarbazide, barium azodicarboxylate, diisopropyl azodicarboxylate, etc. may be used, and typical fluorescent whitening agents include diphenylethylene type, coumarin type, phthalimide type, etc. The antioxidant can be 1010, 1076, 164, BHT, etc.
The surface layer and core layer materials are melted and extruded, and then reach a die head through a filter to be converged, wherein the die head is generally a clothes hanger type die head. The merged multilayer melt flows out from the die lip and is pressed on a cold roll by an electrostatic adsorption system to be rapidly cooled to form a cast sheet. In order to ensure the cooling efficiency, the temperature of the cold roll is generally within 30 ℃;
the cast sheet is then conveyed to a longitudinal drawing machine for longitudinal drawing, wherein the longitudinal drawing ratio is generally between 3 and 5;
the film after the unidirectional stretching is sent to a transverse stretching machine for stretching treatment, the transverse stretching ratio is generally between 3 and 5, the film after the transverse stretching is immediately subjected to heat setting treatment in the transverse stretching machine so as to adjust the heat shrinkage rate of the film, and the temperature of the heat setting treatment is generally between 220 and 250.
Has the advantages that: on one or both surfaces of the reflective film, a low melting point copolyester is used, and thus, the reflective film can be directly thermally bonded to a metal back plate or a light guide plate, thereby suppressing the problem of deformation of the reflective film due to heat; the reflective film capable of being thermally bonded is prepared by adopting multi-layer co-extrusion and a one-step method, so that a secondary coating process is avoided, the cost is reduced, and the operability is good.
Detailed Description
The present invention will be further described with reference to specific examples, but the present invention is not limited to the following examples.
The present invention will be described in detail with reference to specific examples, but the present invention is not limited thereto.
Example 1
Step 1): preparing white master batches: PET, foaming agent, inorganic pigment, fluorescent whitening agent and antioxidant are mixed according to the proportion of 65: 24: 10: 0.4: 0.6, wherein the foaming agent is selected from cyclic polyolefin, the inorganic pigment is selected from CaCO with the grain diameter of 300nm3The fluorescent whitening agent is Basf OB, the antioxidant is 168, and a double-screw exhaust extruder is used during granulation;
step 2): drying the master batch, wherein the drying mode preferably uses a fluidized bed type drying device, the drying temperature is 165 ℃, the drying time is 5H, and the water content of the dried slices is within 30 ppm;
step 3): feeding the dried master batch into a core layer extruder for melt extrusion, wherein the temperature of the extruder is set to be 260-290 ℃;
step 4): the two surface layers of the reflecting film both use CHDM modified copolyester as a raw material, and a double-screw vacuum exhaust type extruder is adopted, wherein the CHDM proportion in each surface layer is 35%, each surface layer also contains silicon dioxide as a surface slipping agent, and the processing temperature of the double-screw extruder is set to be 260-290 ℃;
step 5): the melts of the core layer and the surface layer are converged at a clothes hanger die head and can be attached to a casting sheet roller under the action of electrostatic adsorption to form a solid thick sheet;
step 6): longitudinally drawing and transversely drawing the thick sheet, setting the longitudinal drawing ratio to be 3.45 times and the transverse drawing ratio to be 3.8 times, after transversely drawing, performing heat setting at 235 ℃, cutting edges, and rolling to obtain the required reflecting film; the total thickness of the prepared reflecting film is 50-400 um, the reflecting film can be thermally bonded with a metal plate under the condition of 120 ℃, and the reflecting film can not be deformed by heating when being used in a backlight module for a long time.
Example 2
Step 1): preparing white master batches: PET, foaming agent, inorganic pigment, fluorescent whitening agent and antioxidant are mixed according to the proportion of 70: 15: 14: 0.4: 0.6, wherein the foaming agent is selected from cyclic polyolefin, the inorganic pigment is selected from CaCO with the particle size of 200nm3Selecting a BASF OB as a fluorescent whitening agent and 1098 as an antioxidant, and using a double-screw exhaust type extruder during granulation;
step 2): drying the master batch, wherein the drying mode preferably uses a fluidized bed type drying device, the drying temperature is 165 ℃, the drying time is 5H, and the water content of the dried slices is within 30 ppm;
step 3): feeding the dried master batch into a core layer extruder for melt extrusion, wherein the temperature of the extruder is set to be 260-290 ℃;
step 4): one surface layer uses CHDM modified copolyester as a raw material, wherein the CHDM proportion is 30%, the polyester adopts a double-screw vacuum exhaust type extruder, the other surface layer uses common PET as a raw material, the two surface layers both contain silicon dioxide as a surface slipping agent so as to be beneficial to production and processing, and the processing temperature of the double-screw extruder is set to be 260-290 ℃;
step 5): the multilayer melt is converged at a clothes hanger die head and can be attached to a casting sheet roller under the action of electrostatic adsorption to form a solid thick sheet;
step 6): and (3) longitudinally drawing and transversely drawing the thick sheet, wherein the longitudinal drawing ratio is set to be 3.5 times, the transverse drawing ratio is set to be 3.7 times, after transverse drawing, performing heat setting at 240 ℃, and performing edge cutting and rolling to obtain the required reflecting film.
Example 3
Step 1): preparing white master batches: adding PEN, foaming agent, inorganic pigment and fluorescent pigmentThe whitening agent and the antioxidant are as follows: 24: 10: 0.3: 0.7, wherein the foaming agent is selected from cyclic polyolefin, the inorganic pigment is selected from CaCO with the particle size of 200nm3Selecting a BASF OB as a fluorescent whitening agent and 1098 as an antioxidant, and using a double-screw exhaust type extruder during granulation;
step 2): drying the master batch, wherein the drying mode preferably uses a fluidized bed type drying device, the drying temperature is 165 ℃, the drying time is 5H, and the water content of the dried slices is within 30 ppm;
step 3): feeding the dried master batch into a core layer extruder for melt extrusion, wherein the temperature of the extruder is set to be 260-290 ℃;
step 4): one surface layer was prepared from a CHDM-modified copolyester, the CHDM proportion being 38%. Polyester adopts a double-screw vacuum exhaust type extruder, the other surface layer adopts common PET as a raw material, the two surface layers both contain silicon dioxide as a surface slipping agent so as to be beneficial to production and processing, and the processing temperature of the double-screw extruder is set to be 260-290 ℃;
step 5): the multilayer melt is converged at a clothes hanger die head and can be attached to a casting sheet roller under the action of electrostatic adsorption to form a solid thick sheet;
step 6): the slab was subjected to longitudinal drawing and transverse drawing at a longitudinal drawing ratio of 3.4 times and a transverse drawing ratio of 3.8 times, and after the transverse drawing, heat-set at 240 ℃. After trimming and rolling, the required reflective film is obtained.
Test method
(1) Tensile strength and elongation at break
A Japan Shimadzu AGGressive-10KNA universal electronic tensile machine is adopted, a sample strip with the length of 250mm and the width of 25mm is cut and placed in two clamping ports of a stretching machine, the distance between the clamping ports is 170mm, 5 samples are tested repeatedly, and the average value is taken.
(2) Thermal shrinkage rate
The sample film was cut into sample pieces at 100X 100mm, and the initial size l was measured0Then the sample is placed in an oven at 85 ℃ for 30min, then taken out for cooling, and thenThe final size l is measuredeThen using the formula (l)0-le)/l0The shrinkage rate can be calculated.
(3) Reflectivity of 550nm
Cutting 100 × 100mm sample, placing in CM-2600d spectrocolorimeter of Konica Minolta, measuring spectral reflectance under 550nm condition, respectively measuring two surfaces of film, selecting data of one high surface as reflectance of the reflecting film
(4) Brightness of light
The reflective film was placed in a 21.5 inch side entry backlight, a 188-BDN2 diffuser film and an MS10HB brightness enhancement film were placed on the light guide plate, a BM-7 luminance meter was used, the distance from the luminance meter to the backlight was 500mm, the test was performed after 10min of illumination from the backlight, and the center luminance was selected as the test value.
(5) b value
100X 100mm samples were cut out and placed under a CM-2600d spectrocolorimeter from Konica Minolta to measure the b value
(6) Adhesive strength
The film is heat sealed at 120 ℃ for 4s by using an FR-200 type heat sealing instrument of Shanghai wheat and multiple mechanical companies, the sample bar is 250mm long and 15mm wide, and the sample bar is placed in a clamping opening of a TSL electronic tension tester of Jinnsike testing technology company Limited to carry out peeling test. The 5 sets of data were tested and the average was taken as the result.
Using the preparation method of example 1, reflective films were prepared according to the composition and content of the films described in Table 1, and for comparison, the total thickness was set to 250 μm, Table 1 shows the composition and content parameters of the films, and Table 2 shows the respective parameters of the reflective films corresponding to Table 1.
TABLE 1
TABLE 2
Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (9)
1. A heat-bondable optical reflection film characterized in that: the reflective film comprises a thermal adhesive layer consisting of one or two skin layers, an optical reflective layer consisting of a core layer, the thermal adhesive layer being located on the outside of the core layer;
the preparation method of the heat-bondable optical reflection film comprises the following steps:
step 1): preparing white master batches: mixing and granulating PET, a foaming agent, an inorganic pigment, a fluorescent whitening agent and an antioxidant to prepare a white master batch;
step 2): drying and pretreating the master batch, and then sending the master batch into a core layer extruder for melt extrusion, wherein the temperature of the extruder is set at 260-290 ℃;
step 3): both surface layers use CHDM modified copolyester as raw material, wherein the CHDM proportion is 30-40%; or one surface layer uses CHDM modified copolyester as raw material, wherein the CHDM proportion is 30% -40%, and the other surface layer uses PET as raw material; before the surface layer is extruded and processed, the materials are dried and then sent into an extruder or a direct double-screw vacuum exhaust type extruder, and the processing temperature of the extruder is set at 260-290 ℃;
step 4): the surface layer melt and the core layer melt are converged at a clothes hanger die head and can be attached to a casting sheet roller under the action of electrostatic adsorption to form a solid thick sheet;
step 5): longitudinally stretching and transversely stretching the thick sheet, wherein the total surface stretching ratio is 6-12 times;
step 6): and (3) performing heat setting treatment on the film after the biaxial stretching is finished, wherein the heat setting treatment temperature is between 220 and 250, and then performing edge cutting and rolling to obtain the required reflecting film.
2. The heat-bondable optical reflection film according to claim 1, wherein: the two surface layers of the reflecting film are copolyester layers, and the melting point of the copolyester layers is between 110 ℃ and 140 ℃.
3. The heat-bondable optical reflection film according to claim 1, wherein: the two surface layers of the reflecting film are respectively a copolyester layer and PET.
4. The heat-bondable optical reflection film according to claim 1, 2 or 3, wherein: the total thickness of the reflecting film is 50um-400 um.
5. The heat-bondable optical reflection film according to claim 1, 2 or 3, wherein: the thickness of the single surface layer of the reflecting film is 5um-40 um.
6. The heat-bondable optical reflection film according to claim 2, wherein: the copolyester layer material is CHDM alcohol modified copolyester with the content of 30-40%.
7. A method of producing a microfoamed reflective film according to claim 1, wherein: the inorganic pigment is TiO2、BaSO4、CaCO3Any one or more of the inorganic pigments, the particle size of the inorganic pigment is 1-500nm, and the content of the inorganic pigment accounts for 5% -30% of the total mass fraction of the layer;
the anti-adhesion additive is arranged in the surface layer, the anti-adhesion additive is organic particles or inorganic particles, the organic particles are one or more of polysiloxane, polymethyl methacrylate and polyurethane microspheres, the inorganic particles are one or more of silicon dioxide, calcium carbonate, titanium dioxide and barium sulfate, the particle size of the inorganic particles is 0.5-5 um, and the content of the anti-adhesion additive in the surface layer is 500-2000 ppm.
8. A method of producing a microfoamed reflective film according to claim 1, wherein: the fluorescent whitening agent is one or more of Pasteur OB, stilbene type, coumarin type and phthalimide type;
the high-temperature foaming agent is a physical foaming agent or a chemical foaming agent, and the physical foaming agent is one or more of polyethylene, polypropylene, polypentene, cyclic polyolefin and polymethylpentene; the chemical foaming agent is one or more of trihydrazinotriazine, p-toluenesulfonyl semicarbazide, barium azodicarboxylate and diisopropyl azodicarboxylate.
9. A method of producing a microfoamed reflective film according to claim 1, wherein: the antioxidant is any one or more of antioxidant 1098, antioxidant 168, antioxidant 1010, antioxidant 1076, antioxidant 164 and antioxidant BHT.
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| JPH0971667A (en) * | 1995-09-05 | 1997-03-18 | Toyobo Co Ltd | Polyester film for laminating metal plate and laminated metal plate body using the same |
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