CN104809963A - Semi-transparent polyester film - Google Patents
Semi-transparent polyester film Download PDFInfo
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- CN104809963A CN104809963A CN201510250319.4A CN201510250319A CN104809963A CN 104809963 A CN104809963 A CN 104809963A CN 201510250319 A CN201510250319 A CN 201510250319A CN 104809963 A CN104809963 A CN 104809963A
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- polyethylene terephthalate
- polyester film
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- transparent polyester
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Abstract
The invention discloses a semi-transparent polyester film. The semi-transparent polyester film is formed by that a surface-layer polyethylene terephthalate matrix and an intermediate-layer polyethylene terephthalate matrix are drawn in two directions and thermally molded, the surface-layer polyethylene terephthalate matrix comprises an upper surface layer and a lower surface layer, the upper surface or/and the lower surface of the surface-layer polyethylene terephthalate matrix comprise 0.1-3 percent by mass of an optical diffusing agent, and the intermediate-layer polyethylene terephthalate matrix comprises 0.5-8 percent by mass of inorganic particles or organic silicon particles and 0.3-15 percent by mass of thermoplastic incompatible resin. The white semi-transparent polyester film of which the light transmittance is between that of a transparent polyester film and that of a white polyester film has an excellent light diffusing effect, and can meet light transmittance and light diffusivity required by an advertisement light box at the same time.
Description
Technical field
The present invention relates to a kind of mylar, especially relate to a kind of low density white semi-transparent polyester film.
Background technology
White polyester film is widely used in packing business and advertising.And be applied to advertising lamp box, particularly the mylar of subway advertising lamp-box must be a kind of mylar of white semi-transparent, and it not only has the effect of covering protective seam, and the ad content that can be beautifully printed on mylar.
The mylar that current subway advertising lamp-box uses be on transparent mylar or the semi-transparent mylar of conventional white coated with multiple layer Chinese white to reach semi-transparent effect.Normally TiO2 is mixed in acryl resin, adds some auxiliary agents simultaneously, then by the method such as coated, oven dry, TiO2 and aid particle are coated onto on transparent mylar or the semi-transparent mylar of conventional white.This technique falls behind, and there is a lot of problem, such as product color, transmittance uneven, not ageing-resistant (acryl resin is easily aging through sunshine, and jaundice variable color is not wear-resisting); Acryl resin coating easily comes off, more obvious when being scratched or collide especially, usually causes damaged position printing opacity; Image or ad content must be regurgitated (at film reverse side spray picture), and easily aging, easy light leak, easily scratches.Use conventional white semi-transparent polyester film can reduce coated weight and the number of times of Chinese white as base material, but because conventional white semi-transparent polyester film its light diffusion effect while guarantee transmittance index is bad, still need to carry out coating processing to it, not only increase operation and cost, also due to the use of organic solvent, harmful effect is caused to environment.
Therefore a kind of exploitation that simultaneously can meet the white semi-transparent polyester film of light transmission needed for advertising lamp box and light diffusing is necessary.
Summary of the invention
Goal of the invention: technical matters to be solved by this invention is to provide a kind of white semi-transparent polyester film that simultaneously can meet light transmission needed for advertising lamp box and light diffusing, this semi-transparent polyester film is first obtained by two-way stretch by ABA is three-layer co-extruded again, film forming stable and uniform, the change of transmittance can not be caused because of wearing and tearing, in addition, containing light diffusing agent on film, make the light that transmits evenly soft.
Technical scheme: for solving the problems of the technologies described above, the technical solution adopted in the present invention is:
By top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix through two-way stretch and thermal finalization form, described top layer polyethylene terephthalate matrix comprises upper epidermis and layer, the upper surface of described top layer polyethylene terephthalate matrix is or/and lower surface contains the light diffusing agent that mass percent is 0.1-3%, and described middle layer polyethylene terephthalate matrix contains the thermoplasticity incompatible resin that inorganic particulate or organosilicon particle that mass percent is 0.5-8% and mass percent are 0.3-15%.
Wherein, described light diffusing agent is any one or several mixing in any proportion arbitrarily in silicon dioxide or glass microballoon or silicone resin powder.
Wherein, described inorganic particulate is any one or several mixing in any proportion arbitrarily in titania, barium sulphate, zinc paste or calcium carbonate.
Wherein, also auxiliary agent is comprised in the polyethylene terephthalate matrix of described middle layer, described auxiliary agent comprises whitening agent, heat-resisting stabilizing agent, antioxidative stabilizer, ultraviolet light absorber and ultra-violet stabilizer, semi-transparent polyester film of the present invention can also add other adjuvants not damaging effect of the present invention as required, comprises whitening agent, heat-resisting stabilizing agent, antioxidative stabilizer, ultraviolet light absorber and ultra-violet stabilizer etc.
Wherein, described thermoplasticity incompatible resin is crystalline thermoplastic resin, and its repetitive is ethene, propylene, 1-butylene or polymethyl.
Wherein, described thermoplasticity incompatible resin is multipolymer for the polystyrene in amorphous resin or cyclic olefin or homopolymer, wherein, the multipolymer of described cyclic olefin be cycloolefin, the multipolymer that formed of at least one in bicyclic alkene, tricyclene hydrocarbon or four cycloolefins and ethene or propylene.
Wherein, also doped with spreading agent in the polyethylene terephthalate matrix of described middle layer, described spreading agent is for containing carboxyl or epoxy radicals polar group, or with the olefin polymer of the functional group of responding property of polyethylene terephthalate or multipolymer, or surfactant or adhesive resin.
Wherein, described spreading agent is diglycol, poly alkylene glycol or the polyester copolymer containing m-phthalic acid Third monomer.
Wherein, described inorganic particulate is barium sulphate, the particle diameter of described barium sulphate is 0.5-5um, barium sulfate particles stably can disperse in polyester polymers, film forming is good, and can reach good reflectivity performance and color is whiter finer and smoother, the addition of inorganic particulate is 0.5-8%, preferred 3-5%.
Wherein, the glass temperature of described incompatible resin is 70 DEG C ~ 170 DEG C, preferably 90 DEG C-150 DEG C, the light transmission glass temperature Tg of thermoplasticity incompatible resin being controlled guarantee film in 70 DEG C ~ 170 DEG C is only had to have decline to a certain degree, but the light diffusing of film is greatly improved, the too low raising of thermoplasticity incompatible resin to light diffusing of glass temperature is undesirable, and the too high thermoplasticity incompatible resin of glass temperature then easily causes the too much decline of light transmission.
Wherein, the thickness of described mylar is 75-250um, preferably 100 ~ 188um, and when mylar thickness is less than 75um, the light diffusion effect of film can step-down and rigidity is not enough, when mylar Thickness Ratio 250um is thick, the transmittance of film reduces and improves cost of manufacture, and economy is not good.
Wherein, the transmittance of described mylar, for being less than 40%, is preferably less than 35%, and more preferably range of transmittance is 20% ~ 35%.
Wherein, the particle diameter of described light diffusing agent is 1-10um, preferred 3-7um, this is because the light diffusing agent on top layer is except light diffusion effect, more need to ensure that film surface has certain roughness and is easy to bonding to prevent film, top layer light diffusing agent mass percent is 0.1-3%, preferred 0.1-2%.
Useful benefit: compared to prior art, white semi-transparent polyester film of the present invention, its light transmission is between transparent polyester film and white polyester film and have excellent light diffusion effect, semi-transparent polyester film of the present invention can meet light transmission needed for advertising lamp box and light diffusing simultaneously, this semi-transparent polyester film is first obtained by two-way stretch by ABA is three-layer co-extruded again, film forming stable and uniform, the change of transmittance can not be caused because of wearing and tearing, in addition, containing light diffusing agent on film, make the light that transmits evenly soft, therefore white semi-transparent polyester film of the present invention is while guarantee transmittance index, light diffusion effect is also fine, transmitted light is evenly soft, and it is ageing-resistant, wear-resistant, not easily light leak, also not easily scratched, it just, reverse side all can spraying advertisement.
Embodiment
Below in conjunction with specific embodiment, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Semi-transparent polyester film of the present invention, its transmittance is between transparent polyester film and white polyester film and have excellent light diffusion effect, the density of semi-transparent polyester film of the present invention is lower than the 10%-30% of existing white semi-transparent polyester film density, the visible light transmittance rate of this mylar is less than 40%, preferably be less than 35%, more preferably range of transmittance is 20% ~ 35%, the thickness of this mylar is 75-250um, preferably 100 ~ 188um, when mylar Thickness Ratio 75um is thin, the light diffusion effect of film can step-down and rigidity is not enough, when mylar Thickness Ratio 250um is thick, the transmittance of film reduces and improves cost of manufacture, economy is not good.
Semi-transparent polyester film of the present invention, after passing through extruder coextrusion by top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix, stretched again and thermal finalization forms, top layer polyethylene terephthalate matrix comprises upper epidermis polyethylene terephthalate matrix and layer polyethylene terephthalate matrix, the upper surface of top layer polyethylene terephthalate matrix is or/and lower surface contains the light diffusing agent that mass percent is 0.1-3%, the preferred 0.1-2% of light diffusing agent mass percent, light diffusing agent is any one or several mixing in any proportion arbitrarily in silicon dioxide or glass microballoon or silicone resin powder, the particle diameter of light diffusing agent is 1-10um, the preferred 3-7um of particle diameter, this is because the light diffusing agent of top layer polyethylene terephthalate matrix is except playing light diffusion effect, more need to ensure that film surface has certain roughness and is easy to bonding to prevent film, middle layer polyethylene terephthalate matrix contains inorganic particulate or organosilicon particle that mass percent is 0.5-8% and mass percent is the incompatible resin of 0.3-15%, inorganic particulate is titania, barium sulphate, any one or several mixing in any proportion arbitrarily in zinc paste or calcium carbonate, inorganic particulate preferably barium sulfate, barium sulphate stably can disperse in polyester polymers, film forming is good, and good reflectivity performance can be reached and color is whiter finer and smoother, the particle diameter of barium sulphate is 0.5-5um, the mass percent (addition) of inorganic particulate is 0.5-8%, preferred 3-5%,
The incompatible resin added in the polyethylene terephthalate matrix of middle layer of the present invention can be crystalline thermoplastic resin or amorphism thermoplastic resin, when incompatible resin is crystalline resin, its repetitive can select ethene, propylene, 1-butylene or polymethylpentene etc., crystalline resin polymkeric substance can be homopolymer, also can be multipolymer, also multiple crystalline resin polymer mixed different to composition or melt viscosity etc. can be used in addition, or share with other olefine kind resin or other resins, when incompatible resin is amorphous resin, polystyrene or cyclic olefin copolymer resin etc. can be selected, amorphous resin polymkeric substance can be homopolymer, also can be multipolymer, cyclic olefin copolymer can be by cycloolefin, bicyclic alkene, at least one cyclic olefin in tricyclene hydrocarbon and four cycloolefins, with ethene, the multipolymer that the linear alkenes such as propylene are formed, by adding appropriate incompatible resin in the polyethylene terephthalate matrix of middle layer, the density of film can be reduced significantly and improve its light diffusing, improve economy, the addition of incompatible resin is 0.3-15% mass ratio, preferred 3-8% mass ratio,
The glass temperature Tg of the incompatible resin added in the polyethylene terephthalate matrix of middle layer of the present invention is 70 DEG C ~ 170 DEG C, preferably 90 DEG C ~ 150 DEG C, the light transmission glass temperature Tg of thermoplasticity incompatible resin being controlled guarantee film in 70 DEG C ~ 170 DEG C is only had to have decline to a certain degree, but the light diffusing of film is greatly improved, the too low raising of thermoplasticity incompatible resin to light diffusing of glass temperature is undesirable, and the too high thermoplasticity incompatible resin of glass temperature then easily causes the too much decline of light transmission;
In addition, the present invention is poly-in benzene two Yue acid second diester matrix in order to make thermoplasticity incompatible resin be dispersed in more imperceptibly, preferred interpolation spreading agent reduces thermoplasticity incompatible resin poly-further to the dispersed homogeneous degree in benzene two Yue acid second diester, make the flat bubble of the generation when stretching finer, finally can improve light transmission and the light diffusion effect of film, the kind of spreading agent is not particularly limited, can use possess carboxyl or epoxy radicals isopolarity group or with can with the poly-olefin polymer to the functional group that benzene two Yue acid second diester reacts or multipolymer, diglycol, poly alkylene glycol, surfactant and thermal bonding resin etc., the polyester copolymer of spreading agent of the present invention preferably containing m-phthalic acid Third monomer, spreading agent can be used alone when adding use, also can share two or more, the addition of spreading agent is not particularly limited, preferred mass number percent is 0.1-10%, more preferably mass percent is 0.5-3%, when dispersant is too low, thermoplasticity incompatible resin easily causes due to the dispersion not evenly inadequate miniaturization of cavity when stretching, the light transmission of film is made not reach requirement, dispersant is excessive, and the light transmission of film can be caused too much to decline.
In addition, semi-transparent polyester film of the present invention can also add other adjuvants not damaging effect of the present invention as required, comprise whitening agent, heat-resisting stabilizing agent, antioxidative stabilizer, ultraviolet light absorber and ultra-violet stabilizer etc., this adjuvant adds in the polyethylene terephthalate matrix of middle layer of the present invention.
In all embodiments, stretching condition is all identical below: longitudinal stretching ratio is 3.1, and cross directional stretch ratio is 3.5, and heat setting temperature is 210 degree.
Comparative example
A kind of semi-transparent polyester film, be made up of top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix, wherein, top layer polyethylene terephthalate matrix is made up of the master batch film grade polyester chip (Yizheng Fiber Optical plant FG610) of 25% (mass percent) and 75% fiber polyester chip (Yizheng Fiber Optical plant SB500), middle layer polyethylene terephthalate matrix adds 97.5% fiber polyester chip (Yizheng Fiber Optical plant SB500) by 2.5% polyester slice (in this polyester slice, titania quality is 60% than content) (Shanghai joins happy MB06) and forms, top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix two-way stretch are obtained low density white semi-transparent polyester film after thermal finalization, its performance is in table 1.
Embodiment 1
A kind of semi-transparent polyester film, be made up of top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix, wherein, top layer polyethylene terephthalate matrix adds 75% fiber polyester chip (in this polyester slice, the content of light diffusing agent is 3%) (Yizheng Fiber Optical plant SB500) by 25% film grade polyester chip (Yizheng Fiber Optical plant FG610) and forms, middle layer polyethylene terephthalate matrix is by 3%PP, 1.5% polyester slice (in this polyester slice, titania quality is 60% than content) (Shanghai joins happy MB06) and 95.5% fiber polyester chip (Yizheng Fiber Optical plant SB500) composition, top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix two-way stretch are obtained low density white semi-transparent polyester film after thermal finalization, its performance is in table 1.
Embodiment 2
A kind of semi-transparent polyester film, be made up of top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix, wherein, top layer polyethylene terephthalate matrix is made up of 2% organic siliconresin (Changxing DF50A0) and 98% fiber polyester chip (Yizheng Fiber Optical plant SB500), middle layer polyethylene terephthalate matrix is by 3%PP, 4% polyester slice (in this polyester slice, barium sulphate quality is than content 65%) (Shanghai joins happy MB41) and 93% fiber polyester chip (Yizheng Fiber Optical plant SB500) form, top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix two-way stretch are obtained low density white semi-transparent polyester film after thermal finalization, its performance is in table 1.
Embodiment 3
A kind of semi-transparent polyester film, be made up of top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix, wherein, top layer polyethylene terephthalate matrix is made up of 2% organic siliconresin (Changxing DF50A0) and 98% fiber polyester chip (Yizheng Fiber Optical plant SB500), middle layer polyethylene terephthalate matrix is by 3%PP, 1% organic siliconresin (Changxing DF50A0) and 96% fiber polyester chip (Yizheng Fiber Optical plant SB500) composition, top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix two-way stretch are obtained low density white semi-transparent polyester film after thermal finalization, its performance is in table 1.
Embodiment 4
A kind of semi-transparent polyester film, be made up of top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix, wherein, top layer polyethylene terephthalate matrix adds 75% fiber polyester chip (Yizheng Fiber Optical plant SB500) by 25% film grade polyester chip (Yizheng Fiber Optical plant FG610) and forms, middle layer polyethylene terephthalate matrix is by 3%PP, 4% polyester slice (in this polyester slice, barium sulphate quality is than content 65%) (Shanghai joins happy MB41), 5% film grade polyester chip (Yizheng Fiber Optical plant FG640) and 88% fiber polyester chip (Yizheng Fiber Optical plant SB500) composition, top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix two-way stretch are obtained low density white semi-transparent polyester film after thermal finalization, its performance is in table 1.
Embodiment 5
A kind of semi-transparent polyester film, be made up of top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix, wherein, top layer polyethylene terephthalate matrix adds 75% fiber polyester chip (Yizheng Fiber Optical plant SB500) by 25% film grade polyester chip (Yizheng Fiber Optical plant FG610) and forms, middle layer polyethylene terephthalate matrix is by 1% polymethylpentene (TPX), 4% polyester slice (in this polyester slice, barium sulphate quality is than content 65%) (Shanghai joins happy MB41), 5% film grade polyester chip (Yizheng Fiber Optical plant FG640) and 90% fiber polyester chip (Yizheng Fiber Optical plant SB500) composition, top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix two-way stretch are obtained low density white semi-transparent polyester film after thermal finalization, its performance is in table 1.
Table 1 is the performance index table that comparative example and embodiment 1 ~ 5 obtain product:
Table 1:
| Thickness um | Density transmittance % | Mist degree % | |
| Comparative example | 125um | 1.40 37.2％ | 92.4％ |
| Embodiment 1 | 125um | 1.12 38.4％ | 92.8％ |
| Embodiment 2 | 125um | 1.21 36.0％ | 92.2％ |
| Embodiment 3 | 125um | 1.08 39.2％ | 93.6％ |
| Embodiment 4 | 125um | 1.21 38.3％ | 93.7％ |
| Embodiment 5 | 125um | 1.30 37.1％ | 94.2％ |
Claims (10)
1. a semi-transparent polyester film, it is characterized in that: by top layer polyethylene terephthalate matrix and middle layer polyethylene terephthalate matrix through two-way stretch and thermal finalization form, described top layer polyethylene terephthalate matrix comprises upper epidermis and layer, the upper surface of described top layer polyethylene terephthalate matrix is or/and lower surface contains the light diffusing agent that mass percent is 0.1-3%, described middle layer polyethylene terephthalate matrix contains the thermoplasticity incompatible resin that inorganic particulate or organosilicon particle that mass percent is 0.5-8% and mass percent are 0.3-15%.
2. semi-transparent polyester film according to claim 1, is characterized in that: described light diffusing agent is any one or several mixing in any proportion arbitrarily in silicon dioxide or glass microballoon or silicone resin powder.
3. semi-transparent polyester film according to claim 1, is characterized in that: described inorganic particulate is any one or several mixing in any proportion arbitrarily in titania, barium sulphate, zinc paste or calcium carbonate.
4. semi-transparent polyester film according to claim 1, is characterized in that: described middle layer also comprises auxiliary agent, and described auxiliary agent comprises whitening agent, heat-resisting stabilizing agent, antioxidative stabilizer, ultraviolet light absorber and ultra-violet stabilizer.
5. semi-transparent polyester film according to claim 1, is characterized in that: described thermoplasticity incompatible resin is crystalline thermoplastic resin, and its repetitive is ethene, propylene, 1-butylene or polymethyl.
6. semi-transparent polyester film according to claim 1, it is characterized in that: described thermoplasticity incompatible resin is multipolymer for the polystyrene in amorphous resin or cyclic olefin or homopolymer, wherein, the multipolymer of described cyclic olefin be cycloolefin, the multipolymer that formed of at least one in bicyclic alkene, tricyclene hydrocarbon or four cycloolefins and ethene or propylene.
7. semi-transparent polyester film according to claim 1, it is characterized in that: also doped with spreading agent in the polyethylene terephthalate matrix of described middle layer, described spreading agent is for containing carboxyl or epoxy radicals polar group, or with the olefin polymer of the functional group of responding property of polyethylene terephthalate or multipolymer, or surfactant or adhesive resin.
8. semi-transparent polyester film according to claim 7, it is characterized in that: described spreading agent is diglycol, poly alkylene glycol or the polyester copolymer containing m-phthalic acid Third monomer.
9. semi-transparent polyester film according to claim 3, is characterized in that: described inorganic particulate is barium sulphate, and the particle diameter of described barium sulphate is 0.5-5um.
10. semi-transparent polyester film according to claim 1, is characterized in that: the glass temperature of described thermoplasticity incompatible resin is 70 ° of C ~ 170 ° C.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107933026A (en) * | 2017-11-07 | 2018-04-20 | 云梦县德邦实业有限责任公司 | A kind of PET whites anti-ageing film and its application |
| CN109161039A (en) * | 2018-08-16 | 2019-01-08 | 王泉泉 | It is a kind of to utilize organic carboxyl acid barium salt preparation adjustable polyester film of high light transmission refractive index and preparation method thereof |
| CN111873584A (en) * | 2020-08-04 | 2020-11-03 | 佛山杜邦鸿基薄膜有限公司 | High-brightness white semi-transparent polyester film and production method thereof |
| CN114290782A (en) * | 2022-01-13 | 2022-04-08 | 广东德冠包装材料有限公司 | Biaxially oriented polypropylene film for epoxy resin curing and preparation method thereof |
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| CN107933026A (en) * | 2017-11-07 | 2018-04-20 | 云梦县德邦实业有限责任公司 | A kind of PET whites anti-ageing film and its application |
| CN109161039A (en) * | 2018-08-16 | 2019-01-08 | 王泉泉 | It is a kind of to utilize organic carboxyl acid barium salt preparation adjustable polyester film of high light transmission refractive index and preparation method thereof |
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| CN111873584A (en) * | 2020-08-04 | 2020-11-03 | 佛山杜邦鸿基薄膜有限公司 | High-brightness white semi-transparent polyester film and production method thereof |
| CN114290782A (en) * | 2022-01-13 | 2022-04-08 | 广东德冠包装材料有限公司 | Biaxially oriented polypropylene film for epoxy resin curing and preparation method thereof |
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Effective date of registration: 20210225 Address after: 242099 southeast corner of the intersection of Chunhua road and Jisheng Road, Feicai office, Xuancheng City, Anhui Province Patentee after: Anhui Si Rui Meng New Material Co.,Ltd. Address before: No.68 Shengtai Road, Jiangning Development Zone, Nanjing, Jiangsu 210000 Patentee before: NANJING EVERPOLY NEW MATERIAL TECHNOLOGY JOINT STOCK Co.,Ltd. |
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