CN102167841B - Method for preparing optical reflection film - Google Patents
Method for preparing optical reflection film Download PDFInfo
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- CN102167841B CN102167841B CN201010589164A CN201010589164A CN102167841B CN 102167841 B CN102167841 B CN 102167841B CN 201010589164 A CN201010589164 A CN 201010589164A CN 201010589164 A CN201010589164 A CN 201010589164A CN 102167841 B CN102167841 B CN 102167841B
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Abstract
The invention relates to a method for preparing optical reflection film with micro bubbles distributed inside the reflection film. The preparing method comprises: A. with PET as master batch, putting master batch into a double screw extruder for granulation to get masterbatch pellets; B. fusing and plasticizing masterbatch pellets and adding liquid carbon dioxide into the material amid extrusion process; C. performing casting sheet over the extruded polyester melt; D. vertically stretching the vitrescense casting sheet obtained in Step C at heating state via a vertical stretcher, with vertical stretching ratio of 3 to 4, and then laterally stretching the casting sheet at heating state via a lateral stretcher, with the lateral stretching ratio same as that of the vertical stretching ratio. The optical reflection film made in this way has micro bubbles uniformly distributed inside. With each bubble being a reflection unit, the densely arranged reflection units form total reflection over light, thereby realizing the objective of reflecting light with high efficiency and with no loss.
Description
(1) technical field
The present invention relates to a kind of preparation method of optical reflectance coating.
(2) background technology
Liquid-crystal display (LCD) is a most general current technique of display, and in the 20-30 in future, also will be the mainstream technology that shows.Liquid crystal is a kind of material between solid-state and liquid state, and itself can not be luminous, must just can reach the function of demonstration by backlight.The quality of backlight performance directly has influence on the brightness on LCD surface except meeting directly influences the brightness of LCD video picture quality, particularly backlight.
The liquid crystal backlight system mainly is made up of light source, light guiding plate, all kinds of blooming piece, has the brightness height, long, luminous characteristics such as evenly of life-span.Mainly contain EL, CCFL and three kinds of type of backlight of LED at present, then be divided into side-light type and straight-down negative according to distribution of light sources position difference.Along with the LCD module constantly to brighter, gentlier, thinner direction develops, side-light type CCFL formula backlight becomes the main flow of present backlight development.
The main blooming piece of liquid crystal backlight system has diffusion barrier, brightness enhancement film and reflectance coating.The main effect of reflectance coating is with light high-level efficiency that spills light guiding plate bottom and lossless the reflection, thereby can reduce optical loss, reduces power consumption, and liquid-crystal display face light saturation ratio is provided.
How to improve the optical property of reflectance coating; Improve reflectivity, reduce optical loss, thereby make that the light that sends from light source can at utmost be utilized; Be the important topic that present field of liquid crystal display needs to be resolved hurrily, its reflectivity of various reflectance coatings that existing prepared goes out waits to improve.
(3) summary of the invention
In order to overcome the deficiency that optical reflectance coating reflecting rate that existing prepared goes out waits to improve, the present invention provides a kind of optical reflection membrane preparation method that reflectivity further improves of preparing.
The technical scheme that the present invention solves its technical problem is: a kind of preparation method of optical reflectance coating, be distributed with microvesicle in this optical reflectance coating, and it is characterized in that this preparation method comprises the steps:
A. be masterbatch with PET, masterbatch joined carry out granulation in the twin screw extruder and obtain master batch;
B. the master batch that in steps A, makes carries out drying; Pour master batch into single screw extrusion machine or twin screw extruder fusion plastification after dry the completion; In the process of extruding, in material, add Liquid carbon dioxide, the add-on of Liquid carbon dioxide is that every double centner master batch adds 0.01～0.05 cubic metre;
C. the polyester fondant of extruding is carried out curtain coating casting sheet, promptly polyester fondant flows on the chilling roller through clothes hanger type slit die head, makes polyester fondant on the chilling roller of uniform rotation, be quickly cooled to its thickness that forms vitreous state below second-order transition temperature and casts sheet uniformly; This moment, the gasification phenomenon appearred in Liquid carbon dioxide, thereby at the numerous micropore of the inner formation of film;
D. under heated condition, adopt longitudinal stretching machine to carry out longitudinal stretching the vitreous state casting sheet that makes among the step C, the longitudinal stretching ratio is 3～4; Under heated condition, adopt the machine of widening to carry out cross directional stretch afterwards again, cross directional stretch is than being consistent with the longitudinal stretching ratio.
Be recommended among the step C logical water coolant below 30 ℃ in the chilling roller.
Be recommended among the step D, carry out corona treatment when carrying out longitudinal stretching and cross directional stretch.Carry out corona treatment and can make the film surface activation, with the wet tension force in the surface that increases film.
The purpose of chilling is to make the casting sheet become undefined structure among the step C, reduces its crystallization as far as possible, in order to avoid to road stretching process generation detrimentally affect down., the chilling roller is required for this reason: the one, its surface temperature is wanted evenly, cooling performance will be got well; The 2nd, requirement chilling roller rotating speed is evenly stablized.Logical about 30 ℃ water coolant in the chilling roller is chilled to below 60 ℃ to guarantee the casting sheet.
In step D, it is stretched the casting sheet of process longitudinal stretching by microvoid structure that the Liquid carbon dioxide gasification produces in a longitudinal direction, to reach microvesicle dimensional requirement in a longitudinal direction; Thereby form spherical microvesicle through cross directional stretch to reach microvesicle dimensional requirement in a lateral direction again.
Beneficial effect of the present invention is: be evenly equipped with microvesicle in the blooming piece of preparing, each microvesicle can be used as a reflector element, and the reflector element of high-density arrangement forms total reflection to light, reaches the purpose of high-level efficiency and lossless reflection ray.
(4) embodiment
Below in conjunction with embodiment the present invention is done further explain.
A kind of preparation method of optical reflectance coating is distributed with microvesicle in this optical reflectance coating, it is characterized in that this preparation method comprises the steps:
A. be masterbatch with PET, masterbatch joined carry out granulation in the twin screw extruder and obtain master batch;
B. the master batch that in steps A, makes carries out drying; Pour master batch into single screw extrusion machine or twin screw extruder fusion plastification after dry the completion; In the process of extruding, in material, add Liquid carbon dioxide, the add-on of Liquid carbon dioxide is that every double centner master batch adds 0.03 cubic metre; It is suitable for 0.01～0.05 cubic metre that the add-on of Liquid carbon dioxide remains on every double centner master batch adding; Therefore the concrete add-on of aforesaid liquid carbonic acid gas can be 0.01 cubic metre of every double centner master batch adding; Or every double centner master batch adds 0.02 cubic metre; Or every double centner master batch adds 0.04 cubic metre, or every double centner master batch adds 0.05 cubic metre etc., all can reach the present invention the effect that will reach.
C. the polyester fondant of extruding is carried out curtain coating casting sheet; Be that polyester fondant flows on the chilling roller through clothes hanger type slit die head; Make polyester fondant on the chilling roller of uniform rotation, be quickly cooled to its thickness that forms vitreous state below second-order transition temperature and cast sheet uniformly; Through logical water coolant below 30 ℃ in the chilling roller, be chilled to below 60 ℃ to guarantee the casting sheet; This moment, the gasification phenomenon appearred in Liquid carbon dioxide, thereby at the numerous micropore of the inner formation of film;
D. under heated condition, adopt longitudinal stretching machine to carry out longitudinal stretching the vitreous state casting sheet that makes among the step C, the longitudinal stretching ratio is 3～4; Under heated condition, adopt the machine of widening to carry out cross directional stretch afterwards again, cross directional stretch is than being consistent with the longitudinal stretching ratio.Carry out corona treatment when carrying out longitudinal stretching and cross directional stretch.Carry out corona treatment and can make the film surface activation, with the wet tension force in the surface that increases film.
The purpose of chilling is to make the casting sheet become undefined structure among the step C, reduces its crystallization as far as possible, in order to avoid to road stretching process generation detrimentally affect down., the chilling roller is required for this reason: the one, its surface temperature is wanted evenly, cooling performance will be got well; The 2nd, requirement chilling roller rotating speed is evenly stablized.Logical about 30 ℃ water coolant in the chilling roller is chilled to below 60 ℃ to guarantee the casting sheet.
In step D, it is stretched the casting sheet of process longitudinal stretching by microvoid structure that the Liquid carbon dioxide gasification produces in a longitudinal direction, to reach microvesicle dimensional requirement in a longitudinal direction; Thereby form spherical microvesicle through cross directional stretch to reach microvesicle dimensional requirement in a lateral direction again.
The optical emitting film with microvesicle of the present invention's preparation is compared with the optical reflectance coating that does not have microvesicle:
| Optical reflectance coating | Reflectivity |
| Do not have a PET reflectance coating of microvesicle | 88-92％ |
| The PET reflectance coating of the present invention's preparation | 96.9-99.4％ |
Claims (3)
1. the preparation method of an optical reflectance coating is distributed with microvesicle in this optical reflectance coating, it is characterized in that this preparation method comprises the steps:
A. be masterbatch with PET, masterbatch joined carry out granulation in the twin screw extruder and obtain master batch;
B. the master batch that in steps A, makes carries out drying; Pour master batch into single screw extrusion machine or twin screw extruder fusion plastification after dry the completion; In the process of extruding, in material, add Liquid carbon dioxide, the add-on of Liquid carbon dioxide is that every double centner master batch adds 0.01～0.05 cubic metre;
C. the polyester fondant of extruding is carried out curtain coating casting sheet, promptly polyester fondant flows on the chilling roller through clothes hanger type slit die head, makes polyester fondant on the chilling roller of uniform rotation, be quickly cooled to its thickness that forms vitreous state below second-order transition temperature and casts sheet uniformly;
D. under heated condition, adopt longitudinal stretching machine to carry out longitudinal stretching the vitreous state casting sheet that makes among the step C, the longitudinal stretching ratio is 3～4; Under heated condition, adopt the machine of widening to carry out cross directional stretch afterwards again, cross directional stretch is than being consistent with the longitudinal stretching ratio.
2. the preparation method of optical reflectance coating as claimed in claim 1 is characterized in that: among the step C, in the chilling roller, lead to the water coolant below 30 ℃.
3. according to claim 1 or claim 2 the preparation method of optical reflectance coating is characterized in that: among the step D, carry out corona treatment when carrying out longitudinal stretching and cross directional stretch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010589164A CN102167841B (en) | 2010-12-06 | 2010-12-06 | Method for preparing optical reflection film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010589164A CN102167841B (en) | 2010-12-06 | 2010-12-06 | Method for preparing optical reflection film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102167841A CN102167841A (en) | 2011-08-31 |
| CN102167841B true CN102167841B (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010589164A Active CN102167841B (en) | 2010-12-06 | 2010-12-06 | Method for preparing optical reflection film |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111378255A (en) * | 2018-12-28 | 2020-07-07 | 宁波长阳科技股份有限公司 | PET polyester foam material and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312915A (en) * | 1998-08-18 | 2001-09-12 | 戈尔企业控股股份有限公司 | Contaminant resistant, cleanable, light reflective surface |
| EP1767963A1 (en) * | 2004-06-21 | 2007-03-28 | Idemitsu Kosan Co., Ltd. | Back chassis integrating reflector, back light and liquid crystal display |
| CN101149442A (en) * | 2007-09-18 | 2008-03-26 | 栾玉成 | Reflection-proof film with nano pore, its preparation method and uses |
| CN101512394A (en) * | 2006-10-27 | 2009-08-19 | 东丽株式会社 | White polyester film for liquid crystal display reflector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070081577A (en) * | 2006-02-13 | 2007-08-17 | 삼성전자주식회사 | Liquid crystal display |
-
2010
- 2010-12-06 CN CN201010589164A patent/CN102167841B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312915A (en) * | 1998-08-18 | 2001-09-12 | 戈尔企业控股股份有限公司 | Contaminant resistant, cleanable, light reflective surface |
| EP1767963A1 (en) * | 2004-06-21 | 2007-03-28 | Idemitsu Kosan Co., Ltd. | Back chassis integrating reflector, back light and liquid crystal display |
| CN101512394A (en) * | 2006-10-27 | 2009-08-19 | 东丽株式会社 | White polyester film for liquid crystal display reflector |
| CN101149442A (en) * | 2007-09-18 | 2008-03-26 | 栾玉成 | Reflection-proof film with nano pore, its preparation method and uses |
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| Publication number | Publication date |
|---|---|
| CN102167841A (en) | 2011-08-31 |
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Owner name: NINGBO DXC NEW MATERIAL TECHNOLOGY CO., LTD. Free format text: FORMER NAME: NINGBO DONGXUCHENG CHEMICAL CO., LTD. |
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Address after: 315321 Zhejiang city in Cixi province Xiao Lin Zhen Xiao Lin Road Industrial Area Patentee after: Ningbo DXC New Material Technology Co., Ltd. Address before: 296 No. 315321 Zhejiang city in Cixi province Xiao Lin Zhen Xiao Lin Road Patentee before: Ningbo Dongxucheng Chemical Co., Ltd. |