CN102925036B - Coating composition and optical diffusion film - Google Patents
Coating composition and optical diffusion film Download PDFInfo
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- CN102925036B CN102925036B CN201210430200.1A CN201210430200A CN102925036B CN 102925036 B CN102925036 B CN 102925036B CN 201210430200 A CN201210430200 A CN 201210430200A CN 102925036 B CN102925036 B CN 102925036B
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Abstract
The invention relates to a coating composition and an optical diffusion barrier. The coating composition contains the following components in parts by weight: 40-70 parts of thermosetting resin or ultraviolet curing resin, 50-180 parts of diffusion particle, 2.0-10 parts of cross-linking agent or photoinitiator, 0.10-2 parts of leveling agent, 10-60 parts of cellulose ester and 100-300 parts of solvent. The coating composition has the advantages of high stability, and no aggregation or precipitation among particles; and the viscosity variation of the coating composition is slight. The coating of the optical diffusion film containing the coating composition is uniform, the coating surface does not have the defects of lines, white spots, liquor lines, transparent spots and the like, and thus, the optical diffusion film can satisfy the demands for backlight modules.
Description
Technical field
The diffusion barrier that the present invention relates to coating composition and use this coating composition to be formed.
Background technology
All the time, flat-panel monitor is widely used in TV, computer monitor, notebook computer, mobile phone, digital camera, palm PC, GPS navigator etc.The picture light source of these liquid crystal displays provided by backlight module wherein, is even, high brightness to the requirement of light source.
The effect of optical diffusion is, by refraction effect, the light of spot light or line source is evenly diffused into area source that is homogeneous, high brightness.This optical diffusion is widely used in the backlight module of liquid crystal display or plasma display.
The typical structure of flat panel display backlight die set is: light is emitted by light source, through reflectance coating, light guide plate and reflector plate, carry out diffuseing to form area source through optical diffusion again, optical diffusion is generally configured between light guide plate and brightness enhancement film, and the light penetrated by light guide plate in order to diffusion also reuses brightness enhancement film part reverberation.
In existing optical diffusion, it mainly consists of base material, diffusion layer and backing layer, wherein diffusion layer is primarily of resin, diffusion particle, solvent, crosslinking agent (or initator) forms, in order to reach good diffusion effect, in diffusion layer, the general particle diameter that adopts is at the diffusion particle of 10-40 micron, its addition generally accounts for the 15%-30% of whole system, but, there are the following problems for such system: (1) is dispersed in the particle of a large amount of Large stone in coating fluid, owing to being subject to himself gravity, the impact of the surface energy of particle own and coating fluid viscosity, easily to reunite between particle caking, produce precipitation, and then coating fluid dispersion stabilization is poor, (2) when coating is produced, because the levelability difference of coating fluid easily causes, the coating of diffusion layer is uneven, coating surface strain line, (3) particle aggregation produces the defect such as " white point ", " liquid line " at coating surface, produces " diaphanous spot ", badly influence the quality of production and production efficiency because of shrinkage cavity at coating surface.
Summary of the invention
The technical problem to be solved in the present invention be overcome prior art exist above-mentioned defect, provide a kind of stability high, do not produce the diffusion barrier coating composition of precipitation, particle from caking, modest viscosity.
Another technical problem that the present invention will solve is to provide a kind of coating uniform, coating surface without the diffusion barrier of " white point ", " liquid line ", " diaphanous spot ".
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of coating composition, is characterized in that, described coating composition contain component and parts by weight be:
Heat reactive resin 40 ~ 70 parts;
Diffusion particle 50 ~ 180 parts;
Crosslinking agent 2.0 ~ 10 parts;
Levelling agent 0.10 ~ 2 part;
Cellulose esters 10 ~ 60 parts;
Solvent 100 ~ 300 parts;
Or,
Ultraviolet-curing resin 40 ~ 70 parts;
Diffusion particle 50 ~ 180 parts;
Light trigger 2.0 ~ 10 parts;
Levelling agent 0.10 ~ 2 part;
Cellulose esters 10 ~ 60 parts;
Solvent 100 ~ 300 parts.
In above-mentioned coating composition, described coating composition contain component and parts by weight be:
Heat reactive resin 45 ~ 65 parts;
Diffusion particle 70 ~ 150 parts;
Crosslinking agent 3.0 ~ 8 parts;
Levelling agent 0.2 ~ 1.5 part;
Cellulose esters 15 ~ 55 parts;
Solvent 150 ~ 250 parts;
Or,
Ultraviolet-curing resin 45 ~ 65 parts;
Diffusion particle 70 ~ 150 parts;
Crosslinking agent 3.0 ~ 8 parts;
Levelling agent 0.2 ~ 1.5 part;
Cellulose esters 15 ~ 55 parts;
Solvent 150 ~ 250 parts;
In above-mentioned coating composition, described heat reactive resin is selected from polyester, polyvinyl chloride, ethylene-vinyl acetate copolymer, silicone resin, polystyrene, polyacrylate, polymethacrylates, polyurethane; Or described ultraviolet-curing resin is selected from polyurethane (methyl) acrylate, epoxy (methyl) acrylate, any two kinds of materials in polyester (methyl) acrylate, pure acrylic resin.
In above-mentioned coating composition, described diffusion particle be selected from average grain diameter be 10 ~ 40 μm polymethyl methacrylate microballon, polystyrene microbeads, acrylic resin microballon, calcium carbonate, silica or titanium dioxide.
In above-mentioned coating composition, described cellulose esters is selected from a kind of in cellulose acetate, cellulose acetate-butyrate, cellulose-acetate propionate or their composition.
A kind of optical diffusion, the diffusion layer that the coating composition that it comprises base material and is coated in substrate surface is formed.
Compared with prior art, tool of the present invention has the following advantages:
1. the present invention is by the selection to ultraviolet-curing resin or heat reactive resin, and by the consumption proportion between adjustment celluosic resin and diffusion particle, makes the stability of the coating composition obtained high, soilless sticking caking, precipitation between particle; The viscosity change of coating composition is little.
2. the coating uniform of optical diffusion provided by the invention, coating surface is without the defect such as " strain line ", " white point ", " liquid line ", " diaphanous spot ".
Accompanying drawing explanation
Fig. 1 is the diffusion particle distribution map on the diffusion barrier surface of various embodiments of the present invention.
Fig. 2,3 is the diffusion particle distribution maps on the diffusion barrier surface of comparative example.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but protection scope of the present invention is not limited to this.
Embodiment 1
The preparation of coating composition:
Epoxy acrylic resin (EA) 5 parts,
Urethane acrylate (PUA) 35 parts,
184 1.0 parts,
850 1.0 parts,
BYK307 0.1 part,
Butanone 100 parts,
Toluene 100 parts,
PMMA microballon (10 μm) 50 parts,
Acetylbutyrylcellulose 10 parts,
First epoxy acrylic resin and urethane acrylate are joined in the mixed solvent be made up of butanone and toluene and be uniformly dispersed, add acetylbutyrylcellulose again, height adds levelling agent BYK307 and diffusion particle PMMA microballon again after stirring and being uniformly dispersed, finally add light trigger 184 and 850, after stirring evenly, obtain coating composition.
The coating composition prepared above is applied to as on a face of the polyethylene terephthalate thin film of base material, after 80-90 DEG C to the dry 2.0min of the coating formed, with 700mj/cm
2light quantity by Ultraviolet radiation make curing of coatings formed diffusion layer; Be prepared in the another side coating backing layer of base material again with known technology, obtain diffusion barrier.The assessment result of the diffusion barrier obtained is listed in table 1.
Embodiment 2
The preparation of coating composition:
Epoxy acrylic resin (EA) 5 parts,
Urethane acrylate (PUA) 40 parts,
184 1.5 parts,
850 1.5 parts,
BYK307 0.20 part,
Toluene 100 parts,
Polystyrene microbeads (20 μm) 70 parts,
Cellulose acetate 15 parts,
First epoxy acrylic resin and urethane acrylate are joined in toluene solvant and be uniformly dispersed, add cellulose acetate again, height adds levelling agent BYK307 and diffusion particle polystyrene microbeads again after stirring and being uniformly dispersed, finally add light trigger 184 and 850, after stirring evenly, obtain coating composition.
The coating composition prepared above is applied to as on a face of the polyethylene terephthalate thin film of base material, after 80-90 DEG C to the dry 2.0min of the coating formed, with 700mj/cm
2light quantity by Ultraviolet radiation make curing of coatings formed diffusion layer; Be prepared in the another side coating backing layer of base material again with known technology, obtain diffusion barrier.The assessment result of the diffusion barrier obtained is listed in table 1.
Embodiment 3
The preparation of coating composition:
Ethoxyquin tetramethylol methane tetraacrylate 25 parts,
Urethane acrylate (PUA) 40 parts,
184 2.0 parts,
850 1.5 parts,
BYK307 0.3 part,
Butanone 80 parts,
Isopropyl alcohol 30 parts,
Toluene 140 parts,
Silica microballon (30 μm) 90 parts,
Cellulose-acetate propionate 22 parts,
First ethoxyquin tetramethylol methane tetraacrylate and polyurethane acrylate resin are joined in the mixed solvent be made up of butanone, toluene and isopropyl alcohol and be uniformly dispersed, add cellulose-acetate propionate again, height adds levelling agent BYK307 and diffusion particle silica microballon again after stirring and being uniformly dispersed, finally add light trigger 184 and 850, after stirring evenly, obtain coating composition.
The coating composition prepared above is applied to as on a face of the polyethylene terephthalate thin film of base material, after 80-90 DEG C to the dry 2.0min of the coating formed, with 700mj/cm
2light quantity by Ultraviolet radiation make curing of coatings formed diffusion layer; Be prepared in the another side coating backing layer of base material again with known technology, obtain diffusion barrier.The assessment result of the diffusion barrier obtained is listed in table 1.
Embodiment 4
The preparation of coating composition:
Polyacrylate resin (solid content 50%, hydroxyl value 50) 110 parts,
Isocyanate crosslinking IPDI (NCO content 37%) 8.0 parts,
BYK307 1.5 parts,
Butanone 50 parts,
Toluene 115 parts,
Acrylic resin microballon (40 μm) 150 parts,
Acetylbutyrylcellulose 20 parts,
Cellulose-acetate propionate 15 parts,
First polyacrylate resin is joined in the mixed solvent be made up of butanone and toluene and be uniformly dispersed, add acetylbutyrylcellulose and cellulose-acetate propionate again, height adds levelling agent BYK307 and diffusion particle acrylic resin microballon again after stirring and being uniformly dispersed, finally add isocyanate crosslinking IPDI, after stirring evenly, obtain coating composition.
Be applied to by the coating composition prepared above as on a face of the polyethylene terephthalate thin film of base material, heated-air drying makes curing of coatings form diffusion layer; Be prepared in the another side coating backing layer of base material again with known technology, obtain diffusion barrier.The assessment result of the diffusion barrier obtained is listed in table 1.
Embodiment 5
The preparation of coating composition:
Polyacrylate resin binder (solid content 50%, hydroxyl value 50) 120 parts,
Isocyanate crosslinking IPDI (NCO content 37%) 10.0 parts,
BYK307 0.8 part,
Butanone 50 parts,
Toluene 100 parts,
Acrylic resin microballon (30 μm) 130 parts,
Cellulose acetate 55 parts,
First polyacrylate resin is joined in the mixed solvent be made up of butanone and toluene and be uniformly dispersed, add cellulose acetate again, height adds levelling agent BYK307 and diffusion particle acrylic resin microballon again after stirring and being uniformly dispersed, finally add isocyanate crosslinking IPDI, after stirring evenly, obtain coating composition.
Be applied to by the coating composition prepared above as on a face of the polyethylene terephthalate thin film of base material, heated-air drying makes curing of coatings form diffusion layer; Be prepared in the another side coating backing layer of base material again with known technology, obtain diffusion barrier.The assessment result of the diffusion barrier obtained is listed in table 1.
Embodiment 6
The preparation of coating composition:
Urethane acrylate (PUA) 50 parts,
Caprolactone modification bipentaerythrite five/six acrylate (DPHA) 20 parts,
184 2.5 parts,
850 2.5 parts,
BYK377 2.0 parts,
Butanone 130 parts,
Toluene 170 parts,
Titanium dioxide microballon (15 μm) 180 parts,
Acetylbutyrylcellulose 35 parts,
Cellulose-acetate propionate 25 parts,
First polyurethane acrylate resin and caprolactone modification bipentaerythrite five/six acrylate are joined in the mixed solvent be made up of butanone, toluene and be uniformly dispersed, add acetylbutyrylcellulose and cellulose acetate propionate again, height adds levelling agent BYK307 and diffusion particle titanium dioxide microballon again after stirring and being uniformly dispersed, finally add light trigger 184 and 850, after stirring evenly, obtain coating composition.
The coating composition prepared above is applied to as on a face of the polyethylene terephthalate thin film of base material, after 80-90 DEG C to the dry 2.0min of the coating formed, with 700mj/cm
2light quantity by Ultraviolet radiation make curing of coatings formed diffusion layer; Be prepared in the another side coating backing layer of base material again with known technology, obtain diffusion barrier.The assessment result of the diffusion barrier obtained is listed in table 1.
Comparative example
The preparation of coating composition:
Urethane acrylate (PUA) 50 parts,
Caprolactone modification bipentaerythrite five/six acrylate (DPHA) 20 parts,
184 2.5 parts,
850 2.5 parts,
BYK377 2.0 parts,
Butanone 110 parts,
Toluene 140 parts,
Acrylic resin microballon (15 μm) 165 parts,
First polyurethane acrylate resin and caprolactone modification bipentaerythrite five/six acrylate are joined in the mixed solvent be made up of butanone, toluene, height adds levelling agent BYK307 and diffusion particle acrylic resin microballon again after stirring and being uniformly dispersed, finally add light trigger 184 and 850, after stirring evenly, obtain coating composition.
The coating composition prepared above is applied to as on a face of the polyethylene terephthalate thin film of base material, after 80-90 DEG C to the dry 2.0min of the coating formed, with 700mj/cm
2light quantity by Ultraviolet radiation make curing of coatings formed diffusion layer; Be prepared in the another side coating backing layer of base material again with known technology, obtain diffusion barrier.The assessment result of the diffusion barrier obtained is listed in table 1.
Table 1 performance data table
| Coating pan particle precipitation status | Be coated with apparent | |
| Embodiment 1 | Bottom land is without particle | Apparent homogeneous |
| Embodiment 2 | Bottom land is without particle | Apparent homogeneous |
| Embodiment 3 | Bottom land is without particle | Apparent homogeneous |
| Embodiment 4 | Bottom land is without particle | Apparent homogeneous |
| Embodiment 5 | Bottom land is without particle | Apparent homogeneous |
| Embodiment 6 | Bottom land is without particle | Apparent homogeneous |
| Comparative example | Bottom land has particle to precipitate | Particle aggregation, has strain line, white point, diaphanous spot |
。As can be seen from the performance in table and Fig. 1, the diffusion particle on the surface of the diffusion barrier that the present invention obtains is evenly distributed, apparent homogeneous; As can be seen from Fig. 2 and Fig. 3, owing to there is particle precipitation in coating composition, causing the surface of the diffusion barrier obtained to occur the focusing of diffusion particle, there is the defect such as " white point ", " diaphanous spot " in diffusion barrier surface.
Claims (3)
1. a coating composition, is characterized in that, described coating composition is made up of the component of following portions by weight:
Ultraviolet-curing resin 40 ~ 70 parts;
Diffusion particle 50 ~ 180 parts;
Light trigger 2.0 ~ 10 parts;
Levelling agent 0.10 ~ 2 part;
Cellulose esters 10 ~ 60 parts;
Solvent 100 ~ 300 parts;
Described ultraviolet-curing resin is selected from polyurethane (methyl) acrylate, epoxy (methyl) acrylate, any two kinds of materials in polyester (methyl) acrylate, pure acrylic resin;
Described cellulose esters is selected from a kind of in cellulose acetate, cellulose acetate-butyrate, cellulose-acetate propionate or their composition;
Described diffusion particle be selected from average grain diameter be 10 ~ 40 μm polymethyl methacrylate microballon, polystyrene microbeads, acrylic resin microballon, calcium carbonate, silica or TiO 2 particles.
2. coating composition according to claim 1, is characterized in that, described coating composition is made up of the component of following portions by weight:
Ultraviolet-curing resin 45 ~ 65 parts;
Diffusion particle 70 ~ 150 parts;
Light trigger 3.0 ~ 8 parts;
Levelling agent 0.2 ~ 1.5 part;
Cellulose esters 15 ~ 55 parts;
Solvent 150 ~ 250 parts.
3. an optical diffusion, is characterized in that, it comprises base material and is coated in the diffusion layer formed by the coating composition one of claim 1 ~ 2 Suo Shu of substrate surface.
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| WO2015019962A1 (en) * | 2013-08-09 | 2015-02-12 | 日産化学工業株式会社 | Cured film-forming composition, alignment material, and phase difference material |
| CN104231830A (en) * | 2014-08-08 | 2014-12-24 | 佛山佛塑科技集团股份有限公司 | Preparation method of diffusion film coating composition, preparation method of diffusion film, and corresponding diffusion film |
| CN105572774A (en) * | 2014-10-13 | 2016-05-11 | 鸿富锦精密工业（深圳）有限公司 | Diffusion film, preparation method thereof, backlight module, display device and electronic device |
| CN104459844B (en) * | 2014-12-19 | 2017-07-07 | 四川东材科技集团股份有限公司 | A kind of optical diffusion and preparation method thereof |
| CN104910424B (en) * | 2015-06-29 | 2017-03-29 | 中国乐凯集团有限公司 | A kind of cellulose triacetate thin film |
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| CN112300431B (en) * | 2020-11-08 | 2022-04-15 | 合肥乐凯科技产业有限公司 | Optical diffusion film |
| CN113930139A (en) * | 2021-10-14 | 2022-01-14 | 宁波东旭成新材料科技有限公司 | Bottom coating composition for diffusion film and diffusion film thereof |
| US11747522B1 (en) | 2022-05-23 | 2023-09-05 | People Baiye Technology Co., Ltd. | Twill optical film capable of realizing 3D effect of naked eye of display screen and preparation method thereof |
| CN114647094B (en) * | 2022-05-23 | 2022-08-05 | 人民百业科技有限公司 | Twill optical film capable of realizing naked eye 3D effect of display screen and preparation method thereof |
| CN114994981A (en) * | 2022-06-14 | 2022-09-02 | 江苏弘德光电材料科技有限公司 | Polarizing brightening adhesive film for liquid crystal display backlight module and preparation method thereof |
| CN117757337A (en) * | 2023-12-11 | 2024-03-26 | 惠州合益创光学材料有限公司 | UV post-curing acrylic coating and preparation method thereof |
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