CN104513403A - BOPET film with water-based anti-reflection coating coated online and preparation method of BOPET film - Google Patents
BOPET film with water-based anti-reflection coating coated online and preparation method of BOPET film Download PDFInfo
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- CN104513403A CN104513403A CN201410794568.5A CN201410794568A CN104513403A CN 104513403 A CN104513403 A CN 104513403A CN 201410794568 A CN201410794568 A CN 201410794568A CN 104513403 A CN104513403 A CN 104513403A
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Abstract
The invention discloses a BOPET film for with a water-based anti-reflection coating coated online and a preparation method of the BOPET film. The BOPET film comprises a BOPET substrate layer and the water-based anti-reflection coating which is adhered to at least one surface of the substrate layer, wherein the water-based anti-reflection coating contains refraction particles with the diameters of 0.01 to 10 microns and the refraction index of 1.3 to 1.45; the water-based anti-reflection coating is formed by longitudinally drawing a PET slice and coating a water-based anti-reflection coating liquid onto the surface of the PET slice online, wherein the water-based anti-reflection coating liquid contains larger than or equal to 50 weight percent of water, and the refraction particles are 100 ppm and 1,000 ppm. According to the BOPET film, the overall light transmittance is larger than or equal to 94 percent and is improved by about 6 percent when compared with that of a BOPET film without the coating; the water-based coating liquid is environmentally friendly and has no emission of VOC. According to the preparation method disclosed by the invention, online coating is adopted; the process is simple; the efficiency is high; large-batch production can be realized.
Description
Technical field
The present invention relates to field of organic film material surface modification, particularly a kind of BOPET film and preparation method thereof of online coating Water antireflection coating.
Background technology
Biaxially oriented polyester film and BOPET film, owing to having the excellent characteristic such as insulativity, dimensional stability, mechanical property, thermotolerance, barrier properties for gases, not only be widely used in the products such as packaging, printing, fenestrated membrane, sun power backboard, be also used to manufacture the optics films such as anti-reflection film, prism film, diffusion barrier, cured film.
Optics film not only requires, outside the above-mentioned good characteristic possessed of polyester film, also to require that polyester film need possess and comprise high transparent etc.
The transmittance of any one material does not all reach 100%, even the transmittance of transparent best opticglass is generally also difficult to more than 95%.The major cause causing incident flux to lose in media has: the reflection of (1) light: the optical throughput that reflection and incident light enter polymer surfaces and return.Reflection flux accounts for light through the major part of losing during media.(2) absorption of light: the optical throughput incided on polymkeric substance did not both have through the absorption yet not having the optical throughput of reflecting part to be light.The size that light absorbs depends on the structure of polymkeric substance itself, mainly refers to the character of atomic radical and chemical bond on molecular chain.(3) scattering of light: scattering of light and light are to polymer surfaces, and both not through a part of optical throughput also not reflecting and absorb, its occupation ratio was heavy smaller.Cause the reason of scattering of light to have: the coarse injustice of product surface, polymeric inner structure is uneven as unevenly in molecular weight distribution, unordered to coexist with crystallization phases.
Thus, transparent BOPET film be obtained, the following condition of demand fulfillment, one, goods are noncrystals; Though two partial crystallizations but particle is tiny, be less than visible wavelength range, do not hinder visible ray (300 ~ 800nm) and near infrared light in sunlight spectrum through.
But in BOPET film drawing process, inevitably there is thermotropic crystallization, light is reflected at crystal and amorphous two-phase interface, thus affects transparency, and in the preparation process of film, more or less all additive will be added, additive particles also can cause light reflection, and drawing process, can cause occurring space between additive particles and PET molecule, cause reflection, affect transparency.
In order to improve the transparency of BOPET film, conventional way is the surface coated anti-reflection film at film, improves BOPET film transparency, and antireflecting coating mainly realizes by carrying out off-line processing to BOPET film at present.Wherein organic system coating fluid account for major part.
Summary of the invention
Conveniently process, reduce costs, improve the transparency of BOPET film, the invention provides BOPET film of a kind of online coating Water antireflection coating and preparation method thereof.
The solution that the present invention solves its technical problem is: a kind of BOPET film of online coating Water antireflection coating,
Described film comprises BOPET stratum basale and sticks to the Water antireflection coating at least one surface of stratum basale;
Containing diameter in described Water antireflection coating is 0.01 ~ 10 micron, and specific refractory power is the refractive power particle of 1.3 ~ 1.45;
Described Water antireflection coating is cut into slices after longitudinal stretching at PET, through being coated with online, formed by Water antireflection coating solution to PET slice surface; Containing the water being more than or equal to 50wt% in described Water antireflection coating fluid, the described refractive power particle of 100ppm ~ 1000ppm.
Further, described refractive power particle is one or more in magnesium fluoride, preparing spherical SiO 2, calcium carbonate, granulated glass sphere, polymethylmethacrylate.
Further, described Water antireflection coating fluid is coated with the wet coating thickness of rear formation is online 0.1 ~ 100 micron; Be preferably 10 ~ 60 microns.
Further, also containing one or more in polyester, polyethylene, polypropylene, polyvinyl alcohol and polyacrylic ester in described Water antireflection coating fluid, be used for increasing the adhesivity between coating and stratum basale, because solution is water-based, so described polyester, polyethylene, polypropylene, polyvinyl alcohol and polyacrylic ester are all water miscible.
Further, comprise in described Water antireflection coating fluid in dispersion agent, emulsifying agent, pore forming material any one or more than one, to coordinate above-mentioned polyester, polyethylene, polypropylene, polyvinyl alcohol and polyacrylic ester etc., improve the coating performance of solution.
Further, the BOPET film of above-mentioned online coating Water antireflection coating, its total light transmittance >=94%.
Present invention also offers a kind of preparation method of BOPET film of above-mentioned online coating Water antireflection coating, comprise the following steps:
Melting is extruded in PET section;
By making slab after T-shaped die head, cold drum cooling;
Slab is carried out longitudinal stretching;
By online coating system, the online coating in the PET slab surface Water antireflection coating fluid after longitudinal stretching;
Carry out cross directional stretch and heat setting type.
Further, described online coating be adopt anilox roll coating, anilox roll and rubber roll combine be coated with or die head extrusion coated.
Further, the BOPET film of the online coating Water antireflection coating obtained, its total light transmittance >=94%.
The invention has the beneficial effects as follows: of the present invention have Water antireflection coating BOPET film, has the total light transmittance of 94% or higher, can realize the raising of total light transmittance about 6% compared with uncoated BOPET film; And adopting water-based coating solution, VOC free discharges, environmental friendliness.
In addition, preparation method of the present invention adopts online coating to form antireflection layer, and technique is simple, and the coating obtained is thin and evenly, production rate is fast, efficiency is high, cost is low, can be used for producing in enormous quantities.
Embodiment
The invention provides a kind of BOPET film of online coating Water antireflection coating of total light transmittance >=94%, comprise BOPET stratum basale and stick to the Water antireflection coating at least one surface of stratum basale; Containing refractive power particle in Water antireflection coating; Refractive power particle can be inorganic particulate also can be organic filler, as long as can exist at BOPET film surface-stable, mainly wanting to meet diameter is 0.1 ~ 10 micron, and specific refractory power is 1.3 ~ 1.45; When particle dia is too little, be difficult to dispersion, particle coacervation causes effect uneven; When particle dia is too large, easily drop from coatingsurface.The transmittance that specific refractory power is greater than 1.45 films is not enough.Preferably, described refractive power particle is one or more in magnesium fluoride, preparing spherical SiO 2, calcium carbonate, granulated glass sphere, polymethylmethacrylate.
Described Water antireflection coating, is cut into slices after extruding melting at PET, is coated with Water antireflection coating fluid online, then carries out cross directional stretch and heat setting type by after the slab longitudinal stretching obtained.During coating, containing the water being more than or equal to 50wt% in Water antireflection coating fluid, the described refractive power particle of 100ppm ~ 1000ppm; Refractive power particle content very little time, antireflective effect is not obvious; When refractive power particle content is too many, the mist degree of product can be caused to raise, affect outward appearance.Preferably, refractive power particle content is 300ppm ~ 800ppm.
Used PET section is the PET slicing product that may be used for film production of those skilled in the art's resin, not containing filler.
In order to improve the adhesion property of coating, can add in polyester, polyethylene, polypropylene, polyvinyl alcohol, polyacrylic ester, polystyrene and urethane in Water antireflection coating fluid one or more.Containing water soluble group in described polymer structure, specifically can adopt known water-soluble or aqueous dispersion type.
Such as, the concrete preparation method of polyester of the present invention can existing in any one known technology, namely adopt sour composition or ester composition to be starting material, to obtain after esterification or transesterify, polycondensation successively with alcohol composition.
Described polyacrylic ester comprises one or more the mixing in methyl methacrylate, β-dimethyl-aminoethylmethacrylate, n-butyl acrylate, n-BMA, amyl acrylate.Known emulsion polymerization can be adopted to prepare.
Can also comprise in Water antireflection coating fluid in dispersion agent, emulsifying agent, pore forming material any one or multiple; To improve the coating performance of solution.
Present invention also offers a kind of preparation method of BOPET film of above-mentioned online coating Water antireflection coating, particularly, melting is extruded in PET section; Then by making slab after T-shaped die head, cold drum cooling; Slab is carried out longitudinal stretching, then by online coating system, the online coating in the PET slab surface Water antireflection coating fluid after longitudinal stretching; Cross directional stretch and heat setting type is carried out again after coating.
The method of online coating can adopt conventional online coating process, preferably, adopt anilox roll coating, anilox roll and rubber roll combine be coated with or die head extrusion coated.
In online coating process, the moisture content in Water antireflection coating fluid is evaporated substantially completely, the composition generation solidifications such as resin, thus makes refractive power particle be adhered tightly to film surface.Thus obtain the BOPET film with Water antireflection coating of the online coating of total light transmittance >=94%.
Embodiment 1
The preparation of Water antireflection coating fluid:
Refractive power particle: diameter 2 microns, the preparing spherical SiO 2 of specific refractory power 1.3.
Refractive power particle is added appropriate amount of deionized water and obtain the solution that refractive power particle content is 600ppm; And add the vibrin of 5wt%, the polyvinyl resin of 1wt%, the acrylic resin of 2wt%, the polyvinyl alcohol of 5wt%, the n-BMA of 2wt%, the dispersion agent of 1wt%, the defoamer of 1wt%, the emulsifying agent of 2wt%.
The preparation of BOPET film:
The PET section eliminating moisture is put in extrusion machine, melt extrudes; Then by making the PET slab that thickness is 2000 μm after T-shaped die head, cold drum cooling; By PET slab longitudinally (machine direction (the MD)) stretching 3.5 times at the temperature (i.e. 110 DEG C of temperature) of Tg or higher obtained; Adopt anilox roll coating method to be coated with Water antireflection coating fluid in the one side of this thin slice, the wet coating thickness obtained after coating is about 28 microns; At the temperature higher than longitudinal drawing temperature that is 140 DEG C, thin slice is preheated and drying, with transversely (transverse direction (TD)) stretching 3.5 times further; Heat-treat at 235 DEG C of temperature in the thermal treatment zone of the tenter machine (5 stage tenter) higher than 5 grades ready to described film; Under 200 DEG C or lower temperature, longitudinally film lax 10% is made with horizontal in cooled region; Thermal-setting is carried out, obtained 188 μm of thick two-sided BOPET film scribbling Water antireflection coating with to this film.The physicals of obtained BOPET film is shown in Table 1.
Comparative example 1
The PET section simultaneously adopting same embodiment 1 identical is raw material, stretches according to identical drawing process, removes the operation of online coating, obtains the BOPET film of non-film.
Embodiment 2
The preparation of Water antireflection coating fluid:
Refractive power particle: diameter 0.01 micron, the polymethylmethacrylate of specific refractory power 1.4.
Refractive power particle is added appropriate amount of deionized water and obtain the solution that refractive power particle content is 100ppm; And add the vibrin of 4.5wt%, the n-BMA of 2wt%, the methyl-methacrylate resin of 1.5wt%, the polystyrene of 2wt%, the urethane of 1wt%, the dispersion agent of 2wt%, the defoamer of 0.5wt%, the emulsifying agent of 0.5wt%.
The preparation of BOPET film:
The PET section eliminating moisture is put in extrusion machine, melt extrudes; Then by making the PET slab that thickness is 2000 μm after T-shaped die head, cold drum cooling; By PET slab longitudinally (machine direction (the MD)) stretching 3.5 times at the temperature (i.e. 110 DEG C of temperature) of Tg or higher obtained; The coating method adopting anilox roll and rubber roll to combine is coated with Water antireflection coating fluid on the tow sides face of this thin slice, and the wet coating thickness in the every one side obtained after coating is 10 microns; At the temperature higher than longitudinal drawing temperature that is 140 DEG C, thin slice is preheated and drying, with transversely (transverse direction (TD)) stretching 3.5 times further; Heat-treat at 235 DEG C of temperature in the thermal treatment zone of the tenter machine (5 stage tenter) higher than 5 grades ready to described film; Under 200 DEG C or lower temperature, longitudinally film lax 10% is made with horizontal in cooled region; Thermal-setting is carried out, obtained 125 μm of thick two-sided BOPET film scribbling Water antireflection coating with to this film.The physicals of obtained BOPET film is shown in Table 1.
Comparative example 2
The PET section simultaneously adopting same embodiment 1 identical is raw material, stretches according to identical drawing process, removes the operation of online coating, obtains the BOPET film of non-film.
Embodiment 3
The preparation of Water antireflection coating fluid:
Refractive power particle: diameter 10 microns, the calcium carbonate of specific refractory power 1.45.
Refractive power particle is added appropriate amount of deionized water and obtain the solution that refractive power particle content is 1000ppm; And add the acrylic resin of 05wt%, the polyvinyl alcohol of 2wt%, the n-BMA resin of 1.5wt%, the methyl-methacrylate resin of 1.0wt%, the polystyrene of 3wt%, the urethane of 1wt%, the dispersion agent of 0.5wt%, the defoamer of 0.5wt%, the emulsifying agent of 0.5wt%.
The preparation of BOPET film:
The PET section eliminating moisture is put in extrusion machine, melt extrudes; Then by making the PET slab that thickness is 2000 μm after T-shaped die head, cold drum cooling; By PET slab longitudinally (machine direction (the MD)) stretching 3.5 times at the temperature (i.e. 110 DEG C of temperature) of Tg or higher obtained; Adopt extrusion to be coated with Water antireflection coating fluid on the tow sides face of this thin slice, in the every one side obtained after coating, the thickness of wet coating layer is about 60 microns; At the temperature higher than longitudinal drawing temperature that is 140 DEG C, thin slice is preheated and drying, with transversely (transverse direction (TD)) stretching 3.5 times further; Heat-treat at 235 DEG C of temperature in the thermal treatment zone of the tenter machine (5 stage tenter) higher than 5 grades ready to described film; Under 200 DEG C or lower temperature, longitudinally film lax 10% is made with horizontal in cooled region; Thermal-setting is carried out, obtained 250 μm of thick two-sided BOPET film scribbling Water antireflection coating with to this film.The physicals of obtained BOPET film is shown in Table 1.
Comparative example 3
The PET section simultaneously adopting same embodiment 1 identical is raw material, stretches according to identical drawing process, removes the operation of online coating, obtains the BOPET film of non-film.
The quantitative measurement method of the PET film obtained in above-described embodiment and comparative example is as follows:
1) mensuration of the total light transmittance of film: adopt total light transmittance survey meter (Nippon Denshoku 300A) to measure the total light transmittance of film.
2) mist degree test: adopt MH-500 optical projection mist degree instrument to carry out testing film mist degree.
Each embodiment implementation result is as shown in table 1 |.
Table 1
Above better embodiment of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modifications or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (9)
1. a BOPET film for online coating Water antireflection coating, is characterized in that: comprise BOPET stratum basale and stick to the Water antireflection coating at least one surface of BOPET stratum basale;
Containing diameter in described Water antireflection coating is 0.01 ~ 10 micron, and specific refractory power is the refractive power particle of 1.3 ~ 1.45;
Described Water antireflection coating is cut into slices after longitudinal stretching at PET, through being coated with online, formed by Water antireflection coating solution to PET slice surface; Containing the water being more than or equal to 50wt% in described Water antireflection coating fluid, the described refractive power particle of 100ppm ~ 1000ppm.
2. the BOPET film of online coating Water antireflection coating according to claim 1, is characterized in that: described refractive power particle is one or more in magnesium fluoride, preparing spherical SiO 2, calcium carbonate, granulated glass sphere, polymethylmethacrylate.
3. the BOPET film of online coating Water antireflection coating according to claim 1, is characterized in that: the wet coating thickness that described Water antireflection coating fluid is coated with rear formation is online 0.1 ~ 100 micron.
4. the BOPET film of online coating Water antireflection coating according to claim 1, is characterized in that: also containing one or more in interpolation vibrin, polyvinyl resin, acrylic resin, polyvinyl alcohol resin and polyacrylate resin in described Water antireflection coating fluid.
5. the BOPET film of online coating Water antireflection coating according to claim 4, is characterized in that: comprise in described Water antireflection coating fluid in dispersion agent, emulsifying agent, pore forming material any one or more than one.
6. the BOPET film of the online coating Water antireflection coating according to any one of claim 1-5, its total light transmittance >=94%.
7. a preparation method for the BOPET film of the online coating Water antireflection coating as described in any one of claim 1-5, is characterized in that, comprise the following steps:
Melting is extruded in PET section;
By making slab after T-shaped die head, cold drum cooling;
Slab is carried out longitudinal stretching;
By online coating, the PET slab surface coated Water antireflection coating fluid after longitudinal stretching;
Carry out cross directional stretch and heat setting type.
8. preparation method according to claim 7, is characterized in that: described online coating be adopt anilox roll coating, anilox roll and rubber roll combine be coated with or die head extrusion coated.
9. preparation method according to claim 7, is characterized in that: the BOPET film of the online coating Water antireflection coating obtained, its total light transmittance >=94%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109310055A (en) * | 2016-05-30 | 2019-02-05 | 卢德维格斯文松股份公司 | Energy saving greenhouse curtain |
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| CN111634073A (en) * | 2020-06-01 | 2020-09-08 | 广州视源电子科技股份有限公司 | Preparation method of display panel, display screen and display device |
| CN111634073B (en) * | 2020-06-01 | 2022-09-09 | 广州视源电子科技股份有限公司 | Preparation method of display panel, display screen and display device |
| CN113861475A (en) * | 2021-09-28 | 2021-12-31 | 中国科学技术大学 | Polyester film for optical display and preparation method thereof |
| CN113861475B (en) * | 2021-09-28 | 2022-12-30 | 中国科学技术大学 | Polyester film for optical display and preparation method thereof |
| CN115536892A (en) * | 2022-11-09 | 2022-12-30 | 江苏康辉新材料科技有限公司 | High-oxygen-resistance BOPET film and preparation method thereof |
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Application publication date: 20150415 |