CN114325904A - Polyester reflecting film for large-size thin display - Google Patents
Polyester reflecting film for large-size thin display Download PDFInfo
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- CN114325904A CN114325904A CN202111533396.2A CN202111533396A CN114325904A CN 114325904 A CN114325904 A CN 114325904A CN 202111533396 A CN202111533396 A CN 202111533396A CN 114325904 A CN114325904 A CN 114325904A
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Abstract
The invention belongs to the field of manufacturing of polyester films, and particularly relates to a polyester reflecting film for a large-size thin display, which is characterized by comprising a reflecting layer and matte layers positioned on two sides of the reflecting layer, wherein the reflecting layer is named as a layer B, and the matte layers are named as a layer A; the B layer has a microporous structure; the aperture of the micropore structure is 5-30 mu m, and the distribution density of micropores on the cross section is 2-5 ten thousand per square millimeter; matte particles are dispersed on the layer A; the glossiness of the A layer is 85 degrees and is less than or equal to 15 degrees. The polyester reflective film is a polyester reflective film with good stiffness and excellent high-angle reflection effect.
Description
Technical Field
The invention belongs to the field of polyester film manufacturing, and particularly relates to a polyester reflective film for a large-size thin display.
Background
The polyester reflective film is widely applied to backlight modules of LCD display devices such as mobile phones, computers, flat-panel televisions, monitors and the like. In order to improve the utilization rate of light rays in the backlight module, reduce loss caused by light leakage, improve the brightness of the display and further improve the picture quality of the display, the reflecting film is required to have higher reflectivity. In order to make the reflective film have a higher reflectivity, particles are usually added into the polyester film, and the light reflectivity is increased by using the interface between the polyester and the particles and the pore interface of the micro-pores generated by using the particles as the core.
In recent years, with the trend of thinner and larger displays for home televisions and the like, more requirements are being made on the properties of the reflective film, such as stiffness and reflection angle. However, the addition amount of the particles in the reflective film is generally high, which seriously attenuates the mechanical and mechanical properties of the film, and causes the film to be brittle and to have poor stiffness and toughness. Meanwhile, after the display is thinned, the distance between the light source and the reflecting film is greatly reduced, and the utilization rate of the surface of the conventional reflecting film to high-angle light is low, so that the backlight source is uneven in brightness. In order to improve the angular reflection performance, a diffusion layer is further coated on the surface of the substrate in some technical schemes, but the particle adhesion of the diffusion layer is poor, and the diffusion layer is easy to fall off to cause component pollution and even discard.
Disclosure of Invention
In view of the above disadvantages, the present invention provides a polyester reflective film for a large-sized thin display, which has good stiffness and excellent high-angle reflection effect.
The invention adopts the following technical scheme: a polyester reflecting film for a large-size thin display comprises a reflecting layer and matte layers positioned on two sides of the reflecting layer, wherein the reflecting layer is named as a layer B, and the matte layers are named as a layer A; the B layer has a microporous structure; the aperture of the micropore structure is 5-30 mu m, and the distribution density of micropores on the section in the thickness direction is 2-5 ten thousand/square millimeter; matte particles are dispersed on the layer A; the glossiness of the A layer is 85 degrees and is less than or equal to 15 degrees.
Preferably, the microporous structure of the B layer is obtained by mixing a nonpolar resin with a bulk resin of the B layer, and the B layer nonpolar resin and the B layer bulk polyester have the following relationship:
tm1 is more than or equal to Tm2 (Tm1-Tm2) is less than or equal to 15 ℃, and 20 ℃ is less than or equal to Tg2-Tg1 (Tm2-Tg2), wherein Tm 1: the melting point of the non-polar resin; tm 2: the melting point of the host polyester; tg 1: the glass transition temperature of the non-polar resin; tg 2: the glass transition temperature of the host polyester.
Preferably, the B layer non-polar resin is polystyrene having a syndiotactic structure.
Preferably, the structural unit regularity of the nonpolar resin is 90% or more.
Preferably, the content of the nonpolar resin is 10 to 40 percent of the weight of the B layer.
Preferably, the non-polar resin is mixed with the bulk resin of the B layer in the form of a masterbatch B; the master batch B is obtained by uniformly mixing 40-60 wt% of pure polyester chips with 40-60 wt% of nonpolar resin, carrying out melt shearing mixing in a double-screw granulator, and carrying out extrusion granulation.
Preferably, the A layer is formed by dispersing matte particles in a main resin of the A layer; and the matte particles of the A layer and the main polyester of the A layer have the following relationship:
0.89 is not less than n1/n2 is not less than 1.06, wherein n 1: the refractive index of the matte particles; n 2: refractive index of the host polyester.
Preferably, the temperature of 5 percent of thermal weight loss of the matte particles of the layer A is more than or equal to 300 ℃.
Preferably, the matte particles are present in an amount of 0.3% to 5% by weight of the a layer.
Preferably, the matte particles are dispersed in the bulk resin of the a layer in the form of a masterbatch a; the master batch A is prepared by uniformly mixing 90-97% of pure polyester chips and 3-10% of matte particles according to weight percentage, carrying out melting, shearing and mixing in a double-screw granulator, and extruding and granulating.
Preferably, the polyester reflective film is obtained by multilayer co-extrusion biaxial stretching of a reflective layer and a matte layer.
Preferably, the thickness ratio of the B layer to the A layer on one side is (10-20): 1.
preferably, the backlight module can be used for liquid crystal display.
Has the advantages that:
the reflection rate of the reflection film is controlled through the reflection forming mode of the constraint reflection layer and the matte layer and the glossiness. The invention realizes the compatible dispersion of the syndiotactic polystyrene in the polyester by adding the nonpolar resin in the layer B, controlling the structural unit regularity of the (modified) syndiotactic polystyrene and regulating the glass transition temperature and the melting point of the syndiotactic polystyrene, and realizes the high reflectivity of an enough phase interface by biaxial tension.
And a small amount of matte particles are added in the layer A, the refractive indexes of the matte particles and polyester are controlled, the unification of the matte degree and the light transmittance of the surface of the film is considered by utilizing a biaxial stretching process, and the high-angle and high-effective reflectivity is realized. The added particle amount of the layer A is small, and the good stiffness and the good mechanical property of the polyester reflective film are kept.
In conclusion, the comprehensive display performance of the polyester reflective film is realized by respectively changing the reflectivity of the layer B and the layer A, and the application feasibility of the polyester reflective film in a large-size thin display is improved. Simultaneously, this application changes the formation mode of reflector layer and matte layer and makes and realize the efficient reflection of light under the condition that has lower particle filling volume, improves the machinery and the mechanical properties of film.
Drawings
FIG. 1 is a schematic view of the structure of the polyester reflective film of the present invention.
In the figure: 1. a layer; 2. a layer B; 3. a non-polar resin; 4. matte particles; 5. a reflective pinhole.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The amounts stated herein are by weight unless otherwise indicated.
As shown in fig. 1, a polyester reflective film for a large-sized thin display, the polyester reflective film comprising a reflective layer and matte layers on both sides of the reflective layer, the reflective layer being named as a layer B, the matte layer being named as a layer a; the B layer has a microporous structure; the aperture of the micropore structure is 5-30 mu m, and the distribution density of micropores on the section in the thickness direction is 2-5 ten thousand/square millimeter; matte particles are dispersed on the layer A; the glossiness of the A layer is 85 degrees and is less than or equal to 15 degrees. The common constraint of the two light ray path regulation structures realizes the high reflectivity of each angle of the reflecting film.
The polyester reflecting film provided by the invention comprises a reflecting layer (B layer 2) and matte layers (A layer 1) positioned on two sides of the reflecting layer (B layer 2). The non-polar resin 3 is added to the layer B to realize the light reflection function of the film, and a small amount of matte particles 4 are added to the layer A to realize the high-angle high-effective reflection performance and good stiffness of the film. The layer B and the layer A are co-extruded through melting and multi-layer, cast on a film production line, and then subjected to biaxial tension to form a film. The reflecting film manufactured by the structural design has no problem that surface particles fall off to pollute a module, and the conventional reflecting film cannot be realized (in order to improve the high-angle reflection performance, the conventional reflecting film is mostly coated with a diffusion layer on the surface, but the particles in the diffusion layer are limited by the coating process, the adhesive force is poor, and the module is easily polluted due to falling off).
In the present invention, the melting points and glass transition temperatures of the nonpolar resin of the B layer and the main polyester of the layer have the following relationships: tm1 is more than or equal to Tm2, and (Tm1-Tm2) is less than or equal to 15 ℃, and (Tg1-Tg2) is less than (Tm2-Tg2) at 20 ℃,
wherein,
tm 1: the melting point of the non-polar resin;
tm 2: melting point of the bulk polyester of layer B;
tg 1: the glass transition temperature of the non-polar resin;
tg 2: glass transition temperature of the bulk polyester of layer a.
The melting point of the nonpolar resin is higher than that of the main polyester, and the difference between the two is less than or equal to 15 ℃, so that the compatibility and the dispersibility of the nonpolar resin and the main polyester in the melt extrusion process are ensured, the nonpolar resin can be fully dispersed in the polyester melt in the melt state, and a sufficient phase interface is provided when the cast sheet is cooled to form a film.
The biaxial stretching process of polyester film is a variable temperature stretching process, and the stretching temperature is changed according to a certain gradient. Therefore, the glass transition temperature of the nonpolar resin is higher than 20 ℃ of the main polyester, so that the nonpolar resin and the main polyester can realize phase interface separation in the stretching process, and the formation of reflective micropores is realized. However, the glass transition temperature of the non-polar resin must be less than the melting point of the host polyester, otherwise compatibility and dispersibility during melt extrusion cannot be guaranteed.
In the invention, the refractive index of the matte particles of the layer A and the polyester of the main body of the layer A has the following relationship:
0.89≤n1/n2≤1.06
n 1: refractive index of matte particles
n 2: the refractive index of the host polyester,
the refractive indexes of the matte particles and the main polyester are as close as possible, so that light loss caused by refraction of light on the layer A can be effectively reduced, more light enters the layer B, and the reflectivity of the layer B is improved. The matte particles may be inorganic or organic. Examples of the inorganic particles include silica, calcium carbonate, glass beads, and barium sulfate. The organic particles may be crystalline chain polyolefin-based resins and acrylic resins, such as polyethylene, polypropylene, polybutene, polymethylpentene, polymethacrylate, and the like. It is also possible to use amorphous cyclic olefin copolymers. Among them, the temperature resistance of the organic particles satisfies the following requirements. The present invention is preferably an inorganic silica particle which is easily available.
In the invention, the B layer of non-polar resin is preferably syndiotactic polystyrene, and the main chain structure of the syndiotactic polystyrene is that phenyl groups are arranged on two sides of a molecular chain at intervals, so that the syndiotactic polystyrene has better crystallization performance and is beneficial to the formation of a phase interface. Without affecting the compatibility and dispersibility during melt extrusion, and the formation of reflective micro-holes 4 during stretching, the present invention may include, but is not limited to, polystyrene having a syndiotactic structure, poly (alkylstyrene), poly (phenylstyrene), poly (halogenated styrene), etc., and other chemically modified syndiotactic polystyrenes. The embodiment of the invention selects the Japanese gloss chemical XAREC series syndiotactic polystyrene resin.
In the present invention, the structural unit regularity of the nonpolar resin, such as syndiotactic polystyrene, is 90% or more, preferably 95% or more. The high structural unit regularity can ensure the melting point, the glass transition temperature and the crystallization performance of the syndiotactic polystyrene and meet the requirement of forming a reflecting interface on the reflecting layer.
In the invention, the content of the B-layer nonpolar resin is 10-40% of the weight of the B-layer, specifically 10%, 11%, 12%, 13% … … 20%, 21% … … 29%, 30%, 31% … … 40%. Preferably 15 to 35%, and when the syndiotactic polystyrene accounts for less than 10% of the specific gravity, sufficient phase interfaces cannot be generated even though it is sufficiently dispersed at the time of melt extrusion, and the number of micro-pores generated by phase separation during stretching is insufficient, resulting in a low reflectance of the reflective film. When the proportion of the syndiotactic polyphenyl is higher than 40 percent, excessive phase interfaces are generated, even the syndiotactic polyphenyl is connected in series to form a net, the syndiotactic polyphenyl cannot be fully dispersed, and when the syndiotactic polyphenyl is stretched in two directions, the phase interfaces are connected in series to form macropores, so that micropore interface reflection cannot be provided, and the film breaking during production is caused in serious cases.
In the invention, the glossiness of the layer A is not more than 85 degrees and not more than 15 degrees. The preferred glossiness 85 degree angle is less than or equal to 10 degrees, the low glossiness of high incident angle can change the reflection path of the light with small included angle with the reflection film, and the light is reflected to the square of the backlight source, so that the light utilization rate is improved.
In the invention, the temperature of 5 percent of thermal weight loss of the matte particles of the layer A is more than or equal to 300 ℃. The layer A and the layer B are formed by melting, multi-layer coextrusion and stretching, the multi-layer functions are manufactured at one time, and matte particles and polyester are required to be subjected to a melting and extruding process together. Since the hot working temperature of the polyester is substantially above 260 ℃, the temperature resistance of the matte particles is required to withstand the hot working temperature of the polyester.
In the invention, the content of the matte particles of the A layer is 0.3-5% of the weight of the A layer (in the specific implementation, the content can be 0.3%, 0.4%, 0.5%, 0.6% … … 0.9%, 1%, 1.1%, 1.2% … … 1.9%, 2%, 2.1%, 2.2%, 2.3% … … 2.9%, 3%, 3.1%, 3.2% … … 3.9.9%, 4%, 4.1%, 4.2% … … 5%). The content of the matte particles of the A layer is the guarantee of low glossiness and light transmittance of the A layer at a high incidence angle. The content of matte particles is lower than 0.3%, the light transmittance is higher, but the surface matte degree is insufficient, and the light utilization rate of high incidence angles is too low. If the content of the matte particles is higher than 5%, the utilization rate of light rays with high incidence angles is improved, but the light transmittance is greatly attenuated, so that the reflectivity of the B layer is reduced.
In the invention, the thickness ratio of the B layer to the A layer on one side is (10-20): 1, such as 10:1, 10.1:1, 11: 1. 11.5: 1. 12:1, 13:1, 14:1, 15:1, 16: 1. 17:1 … … 20: 1. The thickness of the B layer is the guarantee of the reflectivity of the polyester reflecting film, and the thickness of the A layer is the guarantee of the stiffness of the polyester reflecting film, and the thickness of the B layer and the thickness of the A layer supplement each other. The thickness of the B layer is too low, and the reflectivity of the reflecting film is poor; the B layer thickness is too high and the reflective film stiffness will be poor. The higher the thickness of the A layer is, the better the stiffness is, but the attenuation of the light transmittance can be caused, so that the reflectivity of the B layer is reduced; the effect is opposite to that of the A layer with a thinner thickness.
In the invention, the main polyester in the layer A and the layer B can be different polyesters or the same polyester, but the polyesters are all polymers of dibasic acid and dihydric alcohol, wherein, the dibasic acid can be linear chain aliphatic diacid, but mainly aromatic diacid, such as terephthalic acid, terephthalic diacetic acid, terephthalic acid and the like, preferably terephthalic acid and terephthalic acid, and more preferably terephthalic acid; the dihydric alcohol is mainly aliphatic diol with 2-4 carbon atoms, such as ethylene glycol, propylene glycol, butanediol, etc., preferably ethylene glycol and butanediol, more preferably ethylene glycol. In addition to the above components, the polyester chip may be modified copolyester to which a small amount of isophthalic acid, phthalic acid, cyclohexanedimethanol, bisphenol a, 2, 6-naphthalenedicarboxylic acid or the like is added. The polyester used in the layers a and B in the present invention is preferably polyethylene terephthalate.
In the present invention, in order to make the non-polar resin and the matte particles have better dispersion effect in the polyester reflective film, the non-polar resin and the matte particles can be prefabricated into a non-polar resin master batch [ i.e. master batch (B) ] and a matte master batch [ i.e. master batch (a) ] in the following way:
masterbatch (B): according to the weight percentage, 40-60% of pure polyester chips are uniformly mixed with 40-60% of nonpolar resin, and the mixture is subjected to melting, shearing and mixing in a double-screw granulator, and is extruded and granulated to prepare the master batch. Wherein the proportion of the pure polyester chip to the non-polar resin can be 2:3, 3:4, 4:5, 5:6, 6:7, 7: 8. 8:9, 1: 1. 9: 8. 8: 7. 7: 6. 6: 5. 5: 4. 4: 3. 3: 2.
Masterbatch (a): according to the weight percentage, 90-97% of pure polyester chips are uniformly mixed with 3-10% of matte particles, and the mixture is subjected to melting, shearing and mixing in a double-screw granulator, and is extruded and granulated to prepare the master batch. The ratio of the clear polyester chips to the matte particles may be 90: 10. 91:9, 92:8, 93:7, 94:6, 95:5, 96:4, 97: 3.
In the invention, the polyester reflecting film realized by the technology has the characteristics of high reflectivity, good stiffness and excellent high-angle light utilization rate, and is particularly suitable for various backlight modules of large-size liquid crystal display.
The polyester reflective film suitable for the large-size thin display is prepared according to the method, and the test method is as follows:
(1) reflectance ratio: according to the standard of HG/T4915-.
(2) Gloss: the gloss is measured according to GB/T9754-2007 standard by using a RHOPOINT KGZ-1A gloss meter under the condition of an angle of 85 degrees, and the lower the gloss, the poorer the specular reflection effect is.
(3) Stiffness: under the condition of ensuring the flatness of the polyester reflecting film, a 15mm × 160mm long strip-shaped polyester film sample is horizontally placed along the MD direction (longitudinal direction: longitudinal stretching direction), the clamping length is 20mm, the difference value of the horizontal positions of the free end and the clamping end is taken as the evaluation standard of the film stiffness, and the smaller the difference value of the horizontal positions is, the better the film stiffness is.
The present invention will be specifically described below with reference to specific examples, but the present invention is not limited thereto.
Example 1
In a multilayer coextrusion film-forming apparatus having an extruder (a) and an extruder (b), in order to form a matte layer (layer a), a master batch (a) and a clear polyester chip which have been premixed are supplied to the extruder (a), melt-extruded at 280 ℃, and introduced into a T-die. To form the reflective layer (layer B), the premixed master batch (B) and the virgin polyester chip were fed to an extruder (B), melt-extruded at 280 ℃, and introduced into a T-die. The extruder (a) and the extruder (b) extrude simultaneously and are introduced into a T die synchronously.
In the T-die, the melt of the extruder (a) was distributed equally to both sides of the melt of the extruder (B), and the two melt groups were combined in a layered manner according to an A/B/A three-layer structure and flowed in a sheet form on a rotating cold drum having a surface temperature of 20 ℃ to obtain a layered cast film. Preheating the laminated cast film at 70-85 deg.c, fast longitudinal stretching in the length direction of 2.8-3.2 times under infrared heating condition at different rotation speeds of two rollers, and cooling at 30-60 deg.c to obtain longitudinally stretched film. Clamping two sides of the longitudinal drawing film by a clamp, sending the longitudinal drawing film into a transverse drawing box, preheating at 90-115 ℃, continuously and repeatedly stretching the longitudinal drawing film by 3.3-3.7 times along the transverse direction (width direction) at the temperature of 110-115 ℃, carrying out heat treatment setting for 7-10s at the temperature of 200-230 ℃, gradually cooling, then carrying out traction and rolling to finally obtain the reflecting film with the matte layer (A) laminated on two sides of the reflecting layer (B), and measuring the reflectivity, the glossiness and the stiffness of the reflecting film.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip No. 10: 90
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 25: 75
The mixture ratio of the layer A to the layer B is that the layer A: layer B200: 1000
Wherein,
pure polyester chip: the melting point Tm is 255 ℃ and the glass transition temperature Tg is 76 ℃ through DSC method; the refractive index is 1.54.
Masterbatch (a): the content of the matte barium sulfate particles is 3 percent; barium sulfate particles had a refractive index of 1.64.
Masterbatch (B): the syndiotactic polystyrene content is 40 percent; syndiotactic polystyrene, measured by DSC method, with melting point Tm of 270 ℃ and glass transition temperature Tg of 103 ℃; and (4) nuclear magnetic resonance testing, wherein the structural unit regularity is 98%.
Example 2
The same equipment and process conditions were used as in example 1.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip 33: 67
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 50: 50
The mixture ratio of the layer A to the layer B is that the layer A: layer B200: 1000
Wherein,
pure polyester chip: same as in example 1.
Masterbatch (a): same as in example 1.
Masterbatch (B): same as in example 1.
Example 3
The same equipment and process conditions were used as in example 1.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip 20: 80
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 50: 50
The mixture ratio of the layer A to the layer B is that the layer A: layer B200: 1500
Wherein,
pure polyester chip: same as in example 1.
Masterbatch (a): the content of the matte particle glass beads is 10 percent; the refractive index of the glass beads is 1.51.
Masterbatch (B): syndiotactic polystyrene content 60%; syndiotactic polystyrene, measured by DSC method, with melting point Tm of 269 ℃, and glass transition temperature Tg of 99 ℃; and (4) nuclear magnetic resonance testing, wherein the structural unit regularity is 95%.
Example 4
The same equipment and process conditions were used as in example 1.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip 30: 70
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 50: 50
The mixture ratio of the layer A to the layer B is that the layer A: layer B200: 1500
Wherein,
pure polyester chip: same as in example 1.
Masterbatch (a): same as in example 3.
Masterbatch (B): same as in example 3.
Example 5
The same equipment and process conditions were used as in example 1.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip ═ 40: 60
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 67: 33
The mixture ratio of the layer A to the layer B is that the layer A: layer B200: 2000
Wherein,
pure polyester chip: same as in example 1.
Masterbatch (a): the content of matte particle silicon dioxide is 10 percent; the refractive index of the silica particles was 1.43.
Masterbatch (B): syndiotactic polystyrene content 60%; syndiotactic polystyrene, measured by DSC method, with melting point Tm of 267 ℃ and glass transition temperature Tg of 96 ℃; and (4) nuclear magnetic resonance testing, wherein the structural unit regularity is 90%.
Example 6
The same equipment and process conditions were used as in example 1.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip 50: 50
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 75: 25
The mixture ratio of the layer A to the layer B is that the layer A: layer B200: 2000
Wherein,
pure polyester chip: same as in example 1.
Masterbatch (a): same as in example 5.
Masterbatch (B): same as in example 5.
Example 7
The same equipment and process conditions were used as in example 1.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip 50: 50
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 75: 25
The mixture ratio of the layer A to the layer B is that the layer A: layer B200: 2000
Wherein,
pure polyester chip: same as in example 1.
Masterbatch (a): the content of the matte particle polytetrafluoroethylene particle is 10 percent; the refractive index of the polytetrafluoroethylene particles is 1.37; 5% of thermal weight loss at 499 ℃.
Masterbatch (B): syndiotactic polystyrene content 60%; syndiotactic polystyrene, measured by DSC method, with melting point Tm of 267 ℃ and glass transition temperature Tg of 96 ℃; and (4) nuclear magnetic resonance testing, wherein the structural unit regularity is 90%.
Comparative example 1
The same equipment and process conditions were used as in example 1.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip No. 10: 90
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 25: 75
The mixture ratio of the layer A to the layer B is that the layer A: layer B200: 1000
Wherein,
pure polyester chip: same as in example 1.
Masterbatch (a): conventional polystyrene content 40%; the melting point Tm is 237 ℃ and the glass transition temperature Tg is 85 ℃ in DSC method.
Masterbatch (B): the content of barium sulfate in the matte particles is 3%, and the refractive index of the barium sulfate particles is 1.64.
Comparative example 2
The same equipment and process conditions were used as in example 1.
In the present example, the number of the first and second,
the layer A comprises the following raw materials in percentage by weight: pure polyester chip 2: 98
The layer B comprises the following raw materials in percentage by weight: pure polyester chip 75: 25
The mixture ratio of the layer A to the layer B is that the layer A: layer B is 100: 1500
Wherein,
pure polyester chip: same as in example 1.
Masterbatch (a): the content of the matte particles PMMA particles is 3%, and the refractive index of the PMMA particles is 1.48; the temperature of 5 percent of thermal weight loss is 280 ℃.
Masterbatch (B): syndiotactic polystyrene content 60%; syndiotactic polystyrene, measured by DSC method, with melting point Tm of 267 ℃ and glass transition temperature Tg of 96 ℃; and (4) nuclear magnetic resonance testing, wherein the structural unit regularity is 90%.
Table 1: tables of data on properties of reflective films of examples and comparative examples
Claims (13)
1. The polyester reflecting film for the large-size thin display is characterized by comprising a reflecting layer and matte layers positioned on two sides of the reflecting layer, wherein the reflecting layer is named as a layer B, and the matte layers are named as a layer A; the B layer has a microporous structure; the aperture of the micropore structure is 5-30 mu m, and the distribution density of micropores on the section in the thickness direction is 2-5 ten thousand/square millimeter; matte particles are dispersed on the layer A; the glossiness of the A layer is 85 degrees and is less than or equal to 15 degrees.
2. The polyester reflective film for large-sized thin displays as claimed in claim 1, wherein the B layer has a cell structure obtained by mixing a nonpolar resin with a bulk polyester of the B layer, and the B layer nonpolar resin and the B layer bulk polyester have the following relationship:
tm1 is more than or equal to Tm2 (Tm1-Tm2) is less than or equal to 15 ℃, and 20 ℃ is less than or equal to Tg2-Tg1 (Tm2-Tg2), wherein Tm 1: the melting point of the non-polar resin; tm 2: the melting point of the host polyester; tg 1: the glass transition temperature of the non-polar resin; tg 2: the glass transition temperature of the host polyester.
3. The polyester reflective film for a large-sized thin display as claimed in claim 2, wherein the B layer non-polar resin is polystyrene having a syndiotactic structure.
4. The polyester reflective film for a large-sized thin display as claimed in claim 3, wherein the structural unit regularity of said nonpolar resin is 90% or more.
5. The polyester reflective film for large-sized thin displays as claimed in claim 2, 3 or 4, wherein the content of the non-polar resin is 10% to 40% by weight of the B layer.
6. The polyester reflective film for a large-sized thin display as claimed in claim 2, wherein said nonpolar resin is mixed with the bulk polyester of said B layer in the form of a master batch B; the master batch B is obtained by uniformly mixing 40-60 wt% of pure polyester chips with 40-60 wt% of nonpolar resin, carrying out melt shearing mixing in a double-screw granulator, and carrying out extrusion granulation.
7. The polyester reflective film for large-scale thin displays as claimed in claim 1, wherein the a layer is formed by dispersing matte particles in a host resin of the a layer; and the matte particles of the A layer and the main polyester of the A layer have the following relationship:
0.89 is not less than n1/n2 is not less than 1.06, wherein n 1: the refractive index of the matte particles; n 2: refractive index of the host polyester.
8. The polyester reflective film for large-scale thin displays as claimed in claim 7, wherein the temperature of 5% of the thermal weight loss of the matte particles of the A layer is not less than 300 ℃.
9. The polyester reflective film for large-scale thin displays as claimed in claim 7, wherein the content of matte particles is 0.3-5% by weight of the A layer.
10. The polyester reflective film for large-scale thin displays according to claim 7, wherein said matte particles are dispersed in the host resin of said a layer in the form of a master batch a; the master batch A is prepared by uniformly mixing 90-97% of pure polyester chips and 3-10% of matte particles according to weight percentage, carrying out melting, shearing and mixing in a double-screw granulator, and extruding and granulating.
11. The polyester reflective film for large-scale thin displays as claimed in claim 1, wherein the polyester reflective film is obtained by multilayer co-extrusion biaxial stretching of the reflective layer and the matte layer.
12. The polyester reflective film for large-sized thin displays as claimed in claim 1, wherein the ratio of the thickness of the B layer to the thickness of the A layer on one side is (10-20): 1.
13. the polyester reflective film for large-sized thin displays according to any of claims 1 to 12, which is used for a backlight module of a liquid crystal display.
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