CN107561608B - Low-blue light optical film for LED lighting device and preparation method thereof - Google Patents
Low-blue light optical film for LED lighting device and preparation method thereof Download PDFInfo
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Abstract
The invention provides a low blue light optical film for an LED lighting device and a preparation method thereof, wherein the low blue light optical film comprises the following components: the functional layer and/or the protective layer contain at least one inorganic blue light absorber and at least one organic blue light absorber or organic-inorganic hybrid blue light absorber; inorganic blue light absorbers include meta-aluminates or meta-stannates. The scheme provided by the invention fully plays the synergistic effect of the specific inorganic compound (inorganic blue light absorbent) and the organic blue light absorbent and the organic inorganic hybrid blue light absorbent, can meet the comprehensive requirements of the LED illumination field on blue light filtering effect, light transmittance and stability, has strong operability and has great practical application value.
Description
Technical Field
The invention belongs to the technical field of LED illumination, and particularly relates to a low-blue light optical film for an LED illumination device and a preparation method thereof.
Background
As LED light sources are widely used in the lighting industry, their energy-saving highlighting performance is widely accepted in the industry; however, in principle, the short-wave blue light remains too much to cause injury to eyes, so the method is also subject to the industry; blue light hazard is always a soft rib of an LED lighting device, and thus, application of LED lighting in various fields, such as schools, hospitals, and the like, involving minors and places of people with weak bodies, and markets in many foreign countries that are sensitive to blue light hazard, are hindered, and related fields have much worry and concern about using LED products. One of the existing solutions to the problem is to add a low blue light film or plate, but due to the limitations of technology and materials, the existing technology has either insignificant effect or unstable performance (blue light filtering effect can be rapidly attenuated in the use process), and has influence on the light transmittance of the whole wave band (including the visible light part of the wave band except blue light), so that the luminous flux is obviously reduced, and is difficult to be accepted and applied by industry; still another solution is to remove part of the short-wavelength blue light by shifting the peak wavelength of the LED chip up to 460nm or above, but because the wavelength of the chip is long, the efficiency of exciting the fluorescent powder by the blue light is greatly reduced, so that the luminous flux of the LED lighting device is greatly reduced, and the blue light ratio of the wavelength below 460nm is still higher, so that the popularization and the use are not possible.
For blue light removal, there are always two misregions within the industry:
the first error zone, namely understanding the damage to blue light, considers that all blue light is harmful; blue light of one color of the three primary colors RGB is present everywhere, including blue light in sunlight, and white light cannot be formed due to lack of color without blue light; but the blue light energy in the sunlight is distributed higher near blue light with longer wave band, and the blue light energy below 460nm of the short wave band wavelength is lower (see figure 1); however, the design of the LED light source is based on that blue light with a short wavelength of 450nm is used to excite yellow fluorescent powder (or red-green fluorescent powder) to form yellow light or red-green light, and the rest blue light is used as a color and the excited light is mixed into white light, so that the energy efficiency is proved to be very high, which is also the main reason for the rapid development of the LED light source industry in recent years; however, in consideration of excitation efficiency, the peak wavelength of blue light of the excited fluorescent powder is designed to be 440-450nm, so that blue light of the wave band and adjacent wave bands is stronger (see fig. 2); the medical community proves that blue light with the wave band of 435-440nm has the greatest damage to human eyes, and for this reason, the blue light hazard coefficient also forms national standard (GB/T20145-2006), and the content of a spectral weighting function for evaluating the damage of a broadband light source to retina in the national standard is shown in Table 2; that is, the blue light filtering should be mainly aimed at the short-wave-band blue light with relatively large energy occupation, which is harmful to human eyes, in the LED light source, but not all the wave-band blue light is filtered. From "Table 2 in GB/T20145-2006, the spectral weighting function of the broad band light source to retinal damage" and the LED light source energy distribution (FIG. 2), the more damaging band is 420-460nm, so high energy blue light with wavelengths between 420-460nm should be treated with emphasis.
The second error area is considered to be required to completely filter blue light or to completely filter blue light with a short wave band, the blue light is an indispensable part of white light, the whole color of the blue light is not seriously yellow to be distorted, and the requirement of human eyes on the color cannot be met from the illumination industry or the display industry; moreover, the sunlight harmless to human eyes is understood to exist in blue light of each wave band, and only the energy distribution of each wave band is different, but the blue light of short wave band is less; thus, blue light is filtered to a degree, not necessarily all, with the goal of being as close to sunlight as possible.
The low blue light optical film for the LED lighting device with good blue light filtering effect and high stability is not available at present due to the fact that the two error areas exist in the field for a long time and the limitation of the performance of the blue light absorbing material.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a low blue optical film for an LED lighting device. The low-blue light optical film has the characteristics of good blue light filtering effect, good light transmittance and high stability.
Another object of the present invention is to provide a low blue diffusion sheet for an LED lighting device.
The invention also provides a preparation method of the low blue light diffusion sheet for the LED lighting device.
It is still another object of the present invention to provide an LED lighting device comprising the low blue diffusion sheet for an LED lighting device described above.
In order to achieve the above object, the present invention provides a low blue optical film for an LED lighting device, the low blue optical film comprising: the functional layer and/or the protective layer contain at least one inorganic blue light absorber and at least one organic blue light absorber or organic-inorganic hybrid blue light absorber; the inorganic blue light absorber comprises meta-aluminate or meta-stannate.
In recent years, various organic blue light absorbers have been developed by the skilled person, and these blue light absorbers mainly composed of organic substances exhibit a certain advantage in terms of blue light filtering effect, but in practice, there is a general problem of poor stability, and the organic blue light absorbers cannot be applied to a high-luminance long-time lighting irradiation environment of an LED light source, and therefore, most of them can only be applied to low-blue light lens industries requiring relatively low levels. At present, there are also reports about the application of the organic blue light absorber in the field of LED light source displays, but these solutions either do not solve the problem of poor stability, or cannot achieve both blue light filtering effect and guaranteed luminous flux. For example, some low blue flat panel display schemes (alleged to be applicable to LED lighting devices) employ blue light absorbers that are metal complexes and (organic) dyes, but in practice have the following significant drawbacks: the effect of absorbing blue light is not obvious when the quantity of the organic dye is small, and the brightness can be greatly influenced when the quantity of the organic dye is large; in addition, the metal complex and the dye have the characteristic of poor light resistance, and the metal complex and the dye fade and lose efficacy after being irradiated for a long time (the working state of the display screen is lightened), so that the blue light filtering effect is obviously attenuated; therefore, when it is applied to the LED lighting industry which has high requirements on blue light filtering effect and reliability, the actual effect cannot meet the requirements at all.
The applicant of the present invention has found that the blue light filtering effect, the light transmittance and the stability are core technical problems to be solved by the low blue light optical film for the LED lighting device, and in order to solve the problems, the applicant of the present invention provides a combination scheme of a specific inorganic compound (hereinafter referred to as an inorganic blue light absorber) and a blue light absorber mainly comprising an organic substance through extensive practical verification work by deeply analyzing the problems. The combined cooperation is as follows: the meta-aluminate or meta-stannate inorganic blue light absorber has high self stability, and can effectively absorb ultra-short wave band high-energy blue light (380-450 nm), so that the influence of the ultra-short wave band blue light on the stability of the organic blue light absorber and the organic and inorganic hybrid blue light absorber is avoided, the loads of the organic blue light absorber and the organic and inorganic hybrid blue light absorber are greatly reduced, and the organic blue light absorber and the organic and inorganic hybrid blue light absorber can stably and comprehensively absorb blue light affecting vision severe wave bands with high efficiency; in addition, the mode of distinguishing the key absorption areas can fully exert the advantages of different blue light absorbers, so that the dosage can be controlled in a lower range, the cost control is facilitated, and the light transmittance of the film is improved. Therefore, the scheme provided by the invention fully plays the synergistic effect of specific inorganic matters, the organic blue light absorber and the organic-inorganic hybrid blue light absorber, and provides a new scheme with practical application value for the low blue light technology in the field of LED illumination; the low-blue light optical film provided by the scheme has the comprehensive performance of good blue light filtering effect, good light transmittance and high stability, and can completely meet the performance requirements of the LED illumination field. In addition, under the basic limitation of the scheme on the types of the selected inorganic blue light absorber, the organic blue light absorber and the organic-inorganic hybrid blue light absorber, the absorption characteristics of each specific blue light absorbing material on blue light in different wave bands are still different, the difference can be fully utilized, and the solutions of different blue light filtering levels can be obtained through matching combination and dosage adjustment of the blue light absorbing materials with different absorption characteristics.
In the low blue optical film for an LED lighting device described above, the functional layer and the protective layer are preferably a diffusion film functional layer and a diffusion film protective layer. The diffusion film functional layer and the diffusion film protective layer also comprise resin, curing agent and microparticles; the resin and the curing agent form an adhesive.
In the low blue optical film for an LED lighting device described above, preferably, the meta-aluminate includes zinc meta-aluminate or gallium meta-aluminate; the metastannate comprises zinc metastannate.
In the low blue light optical film for an LED lighting device, the base material layer is preferably one or more of a polyester film, a polycarbonate film, a polyamide film, a polyimide film, a polypropylene film, a polyethylene film, a polyvinyl chloride film, and the like. Further preferably, the substrate layer is a substrate having good light transmittance and good heat resistance, preferably an optical grade polyester film, and preferably has a thickness of 36 to 250 μm.
In the low blue light optical film for an LED lighting device, blue light having a large influence on the visual sense is mainly in a wavelength band of 410 to 480nm, and therefore, an organic blue light absorber or an organic-inorganic hybrid blue light absorber capable of preferably absorbing blue light in the wavelength band is preferably selected. In addition, it is preferable to select an organic blue light absorber or an organic-inorganic hybrid blue light absorber having relatively good stability as much as possible, and to use the organic blue light absorber in combination with the inorganic blue light absorber. Researches show that the triazole organic blue light absorbent, the phenol organic blue light absorbent, the amine organic blue light absorbent and the nickel organic-inorganic hybrid blue light absorbent have better self stability and very good coordination effect with metaaluminate or metastannate inorganic blue light absorbent. In a preferred embodiment provided by the present invention, the organic blue light absorber comprises 2- (2-hydroxy-3, 5 bis (a, a-dimethylbenzyl) phenyl) benzotriazole, 2- (4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl) -5-octyloxyphenol, 2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, 2- (2 '-hydroxy-4' -benzoylphenyl) -5 chloro-2H-benzotriazole, 2- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -5-n-hexyloxyphenol or hexamethylphosphoric triamide; the organic-inorganic hybrid blue light absorber comprises 2,2' -thiobis (4-tert-octylphenol) nickel extract, 2' -thiobis (4-tert-octylphenol oxy) nickel or 2,2' -thiobis (4-tert-octylphenol) n-butylamine nickel.
In the low blue optical film for the LED lighting device, the applicant of the invention finds that the organic blue absorbent has relatively good blue filtering effect, but relatively poorer stability; the organic-inorganic hybrid blue light absorbent has a slightly poorer blue light filtering effect than the organic blue light absorbent, but has better stability; while inorganic blue light absorbers tend to be the most stable, blue light filtering is somewhat less effective than the former two. Therefore, when various blue light absorbers are used in combination, proper blue light absorber combinations and dosage proportions can be selected according to the respective characteristics.
In the low blue light optical film for an LED lighting device, preferably, the inorganic blue light absorber is spherical nanoparticles; the particle size is preferably 10 to 100nm, more preferably 40 to 60nm. Thus ensuring the specific surface area; on the premise of ensuring the luminous flux of the LED lighting device, the corresponding blue light absorption efficiency is improved as much as possible.
In the low blue light optical film for an LED lighting device, preferably, the content of the inorganic blue light absorbent is 0.5% -10% of the coating liquid in the corresponding layer in percentage by weight; the content of the organic blue light absorbent is 0.5% -5% of the coating liquid in the corresponding layer; the content of the organic-inorganic hybrid blue light absorbent is 0.5% -5% of the coating liquid in the corresponding layer.
In the low blue light optical film for an LED lighting device, it is preferable that at least one kind of inorganic blue light absorber, two kinds of organic blue light absorbers or organic-inorganic hybrid blue light absorbers be contained in the functional layer and/or the protective layer. By combining two or more inorganic blue light absorbers, organic blue light absorbers and organic-inorganic hybrid blue light absorbers which can complement the blue light absorption effects of different wave bands, harmful blue light can be comprehensively and effectively absorbed. The mode can fully exert the characteristics of good absorption effect and good stability of certain single blue light absorbent on certain wave band, and the stability, the light transmittance and the blue light filtering effect of the low blue light optical film can be further improved through combined use.
In the low blue light optical film for an LED lighting device, preferably, the distribution manner of the inorganic blue light absorber, the organic blue light absorber, and the organic-inorganic hybrid blue light absorber in the functional layer and/or the protective layer is as follows:
the protective layer contains an inorganic blue light absorber, and the functional layer contains an organic blue light absorber and an organic-inorganic hybrid blue light absorber; or alternatively, the process may be performed,
the functional layer contains an inorganic blue light absorber and an organic-inorganic hybrid blue light absorber; or alternatively, the process may be performed,
the protective layer contains an inorganic blue light absorber, and the functional layer contains an organic-inorganic hybrid blue light absorber; or alternatively, the process may be performed,
the protective layer contains inorganic blue light absorbent, and the functional layer contains organic blue light absorbent; or alternatively, the process may be performed,
the functional layer contains an inorganic blue light absorber, an organic-inorganic hybrid blue light absorber and an organic blue light absorber; or alternatively, the process may be performed,
the protective layer contains an inorganic blue light absorber and an organic-inorganic hybrid blue light absorber, and the functional layer contains an organic blue light absorber.
In a preferred embodiment provided by the invention, the protective layer contains an inorganic blue light absorber, and the functional layer contains an organic blue light absorber and an organic-inorganic hybrid blue light absorber; or alternatively, the process may be performed,
the functional layer contains an inorganic blue light absorber and two organic-inorganic hybrid blue light absorbers; or alternatively, the process may be performed,
the protective layer contains an inorganic blue light absorbent, and the functional layer contains an organic-inorganic hybrid blue light absorbent; or alternatively, the process may be performed,
the protective layer contains an inorganic blue light absorbent, and the functional layer contains two organic blue light absorbents; or alternatively, the process may be performed,
the functional layer contains one or more organic blue light absorbers, one or more organic and inorganic hybrid blue light absorbers and one inorganic blue light absorber; or alternatively, the process may be performed,
the protective layer contains one or more inorganic blue light absorbers and one or more organic-inorganic hybrid blue light absorbers, and the functional layer contains one or more organic blue light absorbers.
In particular, the requirements of the blue light filtering and the design requirements of the LED lighting device can be determined.
In the low blue optical film for an LED lighting device, a light stabilizer is preferably further added to a layer containing the organic blue light absorber or the organic-inorganic hybrid blue light absorber. The light stabilizer can further improve the stability of the organic blue light absorber and the organic-inorganic hybrid blue light absorber after illumination. Preferably, the light stabilizer comprises bis (1, 2,6, -pentamethyl-4-piperidinyl) -sebacylic acid ester, hydroxyethyl tetramethylpiperidinol, 2- (2H-benzotriazol-2-yl) -6- (dodecyl) -4-methylphenol or rutile type nano-titanium dioxide. Further preferably, the content of the light stabilizer is 0.5 to 5% by weight of the coating liquid in the corresponding layer.
In the low blue optical film for an LED lighting device, the blue light absorber is preferably selected so as not to substantially absorb visible light of 480nm or more. In the specific implementation, the effect of blue light absorption of each wave band can be controlled by adjusting the proportion and the concentration of each blue light absorbent.
In the low blue optical film for an LED lighting device described above, preferably, the protective layer has a thickness of 5 to 10 μm; the thickness of the functional layer is 10-25 mu m; the thickness of the substrate layer is 36-250 μm. In practical applications, the proportion of absorbed blue light can also be reduced by adjusting the thickness of the coating containing the blue light absorber.
The invention also provides a low-blue light diffusion sheet for the LED lighting device, which is a film when the functional layer and the protective layer in the low-blue light optical film for the LED lighting device are diffusion film functional layers and diffusion film protective layers; in the low blue light diffusion sheet, the diffusion film functional layer and the diffusion film protective layer further comprise resin, curing agent and microparticles. Wherein the resin and the curing agent form an adhesive.
In the low blue light diffusion sheet for an LED lighting device described above, preferably, the resin includes a polyacrylate resin or a urethane acrylate resin; the curing agent comprises a polyurethane curing agent or an isocyanate curing agent; the microparticles comprise one or a combination of a plurality of acrylic resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyacrylonitrile and polyimide; the microparticles are preferably polymethyl methacrylate or polybutyl methacrylate; the particle diameter of the fine particles is preferably 3 to 20. Mu.m.
The invention also provides a preparation method of the low blue light diffusion sheet for the LED lighting device, which comprises the following steps (see figure 5 for detailed flow):
(1) Preparing a protective layer coating liquid and a functional layer coating liquid respectively;
(2) Then coating a functional layer on one surface of the substrate layer, drying and rolling; the other side is coated with a protective layer, and after drying, the protective layer is rolled up (the coating equipment described in fig. 8 can be used);
(3) And curing, cooling, cutting and slicing to obtain the low blue light diffusion sheet.
In the method for preparing the low blue light diffusion sheet for an LED lighting device, it is preferable that, when preparing the protective layer coating liquid or the functional layer coating liquid, various blue light absorbers and light stabilizers are added one by one to an organic solvent containing fine particles and resin, and after adding one material, stirring is required for 5 to 30 minutes, and then the other material is added.
The invention also provides an LED lighting device comprising the low blue light diffusion sheet for the LED lighting device.
The scheme provided by the invention can meet the comprehensive requirements of the LED illumination field on the blue light filtering effect, the light transmittance (luminous flux of the LED illumination device) and the stability. And the operability is strong, and the method has great practical application value. The specific effects are as follows:
1. a part of short-wave-band blue light harmful to human eyes in the LED light source can be removed, so that the requirements of various healthy LED lighting devices for blue light filtering are met;
2. the luminous flux of the LED lighting device is not obviously reduced, and the energy-saving high-brightness advantage of the LED light source is maintained;
3. has long-term stability.
Drawings
FIG. 1 is a graph of solar light relative spectrum;
FIG. 2 is a relative spectral diagram of an LED light source;
FIG. 3 is a schematic diagram of a low blue light diffusion sheet in embodiment 1
FIG. 4 is a partial enlarged view of the low blue diffuser in example 1;
FIG. 5 is a process flow diagram of a low blue diffuser in example 1;
FIG. 6 is a graph of transmittance versus spectral for a prior art film scheme and a generic product (no blue light filtering);
FIG. 7 is a graph showing the transmittance of the low blue light diffusion sheet and the common product (without blue light filtering function) prepared in example 1;
FIG. 8 is a diagram of a coating apparatus used in example 1;
fig. 9 is a sectional view of the LED panel lamp in embodiment 1.
1 is a cover plate, 2 is a reflecting sheet, 3 is a light guide plate, 4 is a diffusion plate, 5 is an LED lamp bead, 6 is a frame, 7 is a low blue light optical diffusion sheet, 21 is a base material layer, 22 is a functional layer, 22a is fine particles in the functional layer, 22b is a blue light absorbent in the functional layer, 22c is an adhesive in the functional layer, 23 is a protective layer, 23a is fine particles in the protective layer, 23b is a blue light absorbent in the protective layer, 23c is an adhesive in the protective layer, 30 is a unreeling material, 40 is a reeling material, 50 is a diffusion coating module, 60 is a drying module, 70 is an ultraviolet hardening module, and 41, 42, 51 and 52 are transfer rollers.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
The present embodiment provides a low blue light diffusion sheet (structure diagram is shown in fig. 3, partial enlarged view is shown in fig. 4) for an LED lighting device, which is composed of a base material layer 21, a functional layer 22 (diffusion film functional layer) and a protective layer 23 (diffusion film protective layer), wherein the functional layer 22 contains fine particles 22a, a blue light absorber 22b (black dots in the figure), an adhesive 22c (formed of resin and curing agent), and the like; the protective layer 23 contains fine particles 23a, a blue light absorber 23b (black dots in the figure), an adhesive 23c (formed of a resin and a curing agent), and the like. In this embodiment, the maximum particle diameter of the fine particles 22a in the protective layer 23 (back surface layer, i.e., light incident surface) is 8 μm, and the maximum particle diameter of the fine particles 23a in the functional layer 22 (front surface layer, i.e., light emitting surface) is 25 μm.
The preparation process of the low blue light diffusion sheet is as follows (see the flow chart of figure 5):
(1) Preparing a protective layer coating solution and a functional layer coating solution respectively;
(2) Then, a functional layer is coated on one side of the substrate layer (coating equipment is shown in fig. 8, and comprises a unreeling material 30, a reeling material 40, a plurality of transfer rollers (4 l, 42, 5l and 52), a diffusion coating module 50, a drying module 60 and an ultraviolet hardening module 70), and the reeling material is rolled after drying; the other side is coated with a protective layer (of the same functional layer) and is rolled after being dried;
(3) And curing, cooling, cutting and slicing to obtain the low blue light diffusion sheet.
Wherein, the raw materials for preparing the functional layer coating solution comprise:
the specific preparation process of the functional layer coating liquid comprises the following steps:
(1) Adding an organic solvent into the charging barrel;
(2) Adding PMMA microparticles into the preparation liquid, and stirring for 30 minutes;
(3) Adding polyacrylate resin into the prepared solution, and stirring for 30 minutes;
(4) Adding various blue light absorbers and light stabilizers into the liquid in sequence, stirring each for 10 minutes, and adding the other one;
(5) Adding isocyanate curing agent into the mixed solution, and stirring for 10 minutes;
(6) The liquid is tested for viscosity, solid content and appearance, and various data are recorded.
Wherein, the raw materials for preparing the protective layer coating solution comprise:
the specific preparation process of the protective layer coating liquid comprises the following steps:
(1) Adding an organic solvent into the charging barrel;
(2) Adding PBMA microparticles into the mixed solution, and stirring for 30 minutes;
(3) Adding polyacrylate resin into the prepared solution, and stirring for 30 minutes;
(4) Adding zinc metaaluminate into the mixed solution, and stirring for 10 minutes;
(5) Adding isocyanate curing agent into the mixed solution, and stirring for 10 minutes;
(6) The liquid is tested for viscosity, solid content and appearance, and various data are recorded.
The following tests were performed on the low blue diffuser described above, and the test results are reported in table 1:
(1) Placing a low-blue light diffusion sheet into the LED panel lamp (a functional layer is close to the diffusion plate 4, a protective layer is close to the light guide plate 3), and testing absolute power values of all wave bands (with an interval of 1 nm) in an integrating sphere by using a spectrum analyzer (with the integrating sphere);
testing absolute power values (contrast of the added film and the non-added film) of each wave band and testing the blue light filtering ratio;
the rate of change of luminous flux of the LED lighting device (with and without the film contrast) was tested.
Note that: fig. 8 is a schematic structural diagram of one of the LED panel lamps, which is composed of a cover plate 1, a reflecting sheet 2, a light guide plate 3, a diffusion plate 4, LED lamp beads 5, a frame 6 and a low blue light optical diffusion sheet 7.
(2) RA test, forming LED lighting device, lighting 240H, then lighting and unlit low blue light optical diffusion sheets all test absolute power value of each wave band, then the integrated value of absolute power value of corresponding wave band (420-460 nm), the ratio of 1-two is the rate of reducing the ratio of filtering blue light after RA.
Table 1 low blue light diffuser test results
Note that: 1. the blue light absorptivity is in the range of 420-460nm, the diaphragm (low blue light diffusion sheet) and the non-diaphragm of the embodiment are respectively tested by a spectrum analyzer (with an integrating sphere) in the same LED lighting device (only the diaphragm is replaced) for testing the sum of spectral irradiance (absolute power value) of each 1nm, and the ratio data of the embodiment and the data of the common device (without the diaphragm) is calculated; the blue light filtering ratio of the embodiment is as follows: 1-data of examples/data of common membrane;
2. luminous flux reduction rate: after adding the diaphragm of the example and without the diaphragm, the change rates of the luminous fluxes of the two are tested and compared in the same LED lighting device (only the diaphragm is replaced) by a spectrum analyzer (with an integrating sphere), and the luminous flux reduction rate is: 1-data for the example/data for the normal device (no membrane);
3. the ratio of decrease in the blue light after RA, which is the ratio of decrease in the blue light after RA, was compared between the example lighting film and the unlit film in the same lighting device (see item 1 above for specific reference) for 240 hours at normal temperature: 1-blue light absorptance after lighting/blue light absorptance after lighting;
4. the comparison example scheme is that the main wavelength of a blue light chip in an LED lamp bead is adjusted to 460nm, and then test data is compared with a conventional LED lighting device provided with a normal LED lamp bead (the main wavelength of the blue light chip is 450 nm), and the method is described in terms 1-3.
In addition, the conventional film scheme (containing organic dye blue light absorber) was subjected to RA test under the condition of item 3 as in table 1 above and then compared with the conventional product (no blue light filtering function) on the market, and the obtained transmittance curve is shown in fig. 6 (since the scheme cannot be used for a lighting device, the taken sample cannot reach a state that can be tested in the lighting device, and thus can only be compared by testing the transmittance curve); the low blue light diffusion sheet (product of the present invention) prepared in this example was subjected to RA test under the condition of item 3 as noted in table 1 above and then compared with the light transmittance of a general product (blue light filtering-free function) on the market, and the resulting light transmittance curve was shown in fig. 7. As can be seen from fig. 6 and 7, the low blue light diffusion sheet in the present embodiment has a performance greatly superior to that of the existing diaphragm scheme, and not only can be used for absorbing harmful blue light in a specific wavelength band with high efficiency and overall, but also has high stability.
Example 2
The present embodiment provides a low blue light diffusion sheet for an LED lighting device, which is composed of a functional layer (diffusion film functional layer), a base material layer, and a protective layer (diffusion film protective layer).
The preparation method of the low blue light diffusion sheet is the same as that of the embodiment 1; the preparation methods of the functional layer coating liquid and the protective layer coating liquid are similar to those of example 1, except that the blue light absorber and the amount used are different, specifically as follows:
the functional layer coating liquid comprises the following raw materials:
the raw materials of the protective layer coating liquid comprise:
the low blue diffuser was tested in the same manner as the product of example 1 and the test results are reported in table 1.
Example 3
The present embodiment provides a low blue light diffusion sheet for an LED lighting device, which is composed of a functional layer (diffusion film functional layer), a base material layer, and a protective layer (diffusion film protective layer).
The preparation method of the low blue light diffusion sheet is the same as that of the embodiment 1; the preparation methods of the functional layer coating liquid and the protective layer coating liquid are similar to those of example 1, except that the blue light absorber and the amount used are different, specifically as follows:
the raw materials of the functional layer coating solution comprise:
the raw materials of the protective layer coating solution comprise:
the low blue diffuser was tested in the same manner as the product of example 1 and the test results are reported in table 1.
Example 4
The present embodiment provides a low blue light diffusion sheet for an LED lighting device, which is composed of a functional layer (diffusion film functional layer), a base material layer, and a protective layer (diffusion film protective layer).
The preparation method of the low blue light diffusion sheet is the same as that of the embodiment 1; the preparation methods of the functional layer coating liquid and the protective layer coating liquid are similar to those of example 1, except that the blue light absorber and the amount used are different, specifically as follows:
the raw materials of the functional layer coating solution comprise:
the raw materials of the protective layer coating solution comprise:
the low blue diffuser was tested in the same manner as the product of example 1 and the test results are reported in table 1.
Claims (25)
1. A low blue optical film for an LED lighting device, the low blue optical film comprising:
the functional layer and/or the protective layer contain at least one inorganic blue light absorber and at least one organic blue light absorber or organic-inorganic hybrid blue light absorber;
the inorganic blue light absorber comprises meta-aluminate or meta-stannate.
2. The low-blue optical film for an LED lighting device according to claim 1, wherein the functional layer and the protective layer are a diffusion film functional layer and a diffusion film protective layer.
3. The low blue optical film for an LED lighting device according to claim 1, wherein said meta-aluminate comprises zinc meta-aluminate or gallium meta-aluminate; the metastannate comprises zinc metastannate.
4. The low-blue optical film for an LED lighting device according to claim 1, wherein the base material layer is one or more of a polyester film, a polycarbonate film, a polyamide film, a polyimide film, a polypropylene film, a polyethylene film, and a polyvinyl chloride film.
5. The low blue optical film for LED lighting devices according to claim 1, wherein said base material layer is an optical grade polyester film having a thickness of 36 to 250 μm.
6. The low-blue optical film for an LED lighting device according to claim 1, wherein the organic blue light absorber comprises a triazole-based organic blue light absorber, a phenol-based organic blue light absorber, or an amine-based organic blue light absorber; the organic-inorganic hybrid blue light absorber is a nickel organic-inorganic hybrid blue light absorber.
7. The low blue light optical film for LED lighting devices according to claim 6, wherein said organic blue light absorber comprises 2- (2-hydroxy-3, 5 bis (a, a-dimethylbenzyl) phenyl) benzotriazole, 2- (4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl) -5-octyloxyphenol, 2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, 2- (2 '-hydroxy-4' -benzoylphenyl) -5 chloro-2H-benzotriazole, 2- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -5-n-hexyloxyphenol or hexamethylphosphoric triamide.
8. The low blue light optical film for an LED lighting device according to claim 6, wherein said organic-inorganic hybrid blue light absorber comprises 2,2' -thiobis-p-tert-octylphenol extracted nickel, 2' -thiobis (4-tert-octylphenol oxy) nickel, or 2,2' -thiobis (4-tert-octylphenol) n-butylamine nickel.
9. The low blue optical film for an LED lighting device according to claim 1, wherein said inorganic blue light absorber is spherical nanoparticles.
10. The low blue optical film for LED lighting devices according to claim 9, wherein said spherical nanoparticles have a particle diameter of 10-100nm.
11. The low blue light optical film for LED lighting devices according to claim 10, wherein said spherical nanoparticles have a particle diameter of 40-60nm.
12. The low blue optical film for an LED lighting device according to claim 1, wherein the inorganic blue absorbent is contained in an amount of 0.5 to 10% by weight of the coating liquid in the corresponding layer; the content of the organic blue light absorbent is 0.5% -5% of the coating liquid in the corresponding layer; the content of the organic-inorganic hybrid blue light absorbent is 0.5% -5% of the coating liquid in the corresponding layer.
13. The low blue light optical film for an LED lighting device according to claim 1, wherein the functional layer and/or the protective layer contains at least one inorganic blue light absorber, two organic blue light absorbers or an organic-inorganic hybrid blue light absorber.
14. The low blue optical film for an LED lighting device according to claim 1, wherein the distribution of the inorganic blue light absorber, the organic blue light absorber, and the organic-inorganic hybrid blue light absorber in the functional layer and/or the protective layer is as follows:
the protective layer contains an inorganic blue light absorber, and the functional layer contains an organic blue light absorber and an organic-inorganic hybrid blue light absorber; or alternatively, the process may be performed,
the functional layer contains an inorganic blue light absorber and an organic-inorganic hybrid blue light absorber; or alternatively, the process may be performed,
the protective layer contains an inorganic blue light absorber, and the functional layer contains an organic-inorganic hybrid blue light absorber; or alternatively, the process may be performed,
the protective layer contains inorganic blue light absorbent, and the functional layer contains organic blue light absorbent; or alternatively, the process may be performed,
the functional layer contains an inorganic blue light absorber, an organic-inorganic hybrid blue light absorber and an organic blue light absorber; or alternatively, the process may be performed,
the protective layer contains an inorganic blue light absorber and an organic-inorganic hybrid blue light absorber, and the functional layer contains an organic blue light absorber.
15. The low blue optical film for an LED lighting device according to claim 14, wherein the distribution of the inorganic blue light absorber, the organic blue light absorber, and the organic-inorganic hybrid blue light absorber in the functional layer and/or the protective layer is as follows:
the protective layer contains an inorganic blue light absorber, and the functional layer contains an organic blue light absorber and an organic-inorganic hybrid blue light absorber; or alternatively, the process may be performed,
the functional layer contains an inorganic blue light absorber and two organic-inorganic hybrid blue light absorbers; or alternatively, the process may be performed,
the protective layer contains an inorganic blue light absorbent, and the functional layer contains an organic-inorganic hybrid blue light absorbent; or alternatively, the process may be performed,
the protective layer contains an inorganic blue light absorbent, and the functional layer contains two organic blue light absorbents; or alternatively, the process may be performed,
the functional layer contains one or more organic blue light absorbers, one or more organic and inorganic hybrid blue light absorbers and one inorganic blue light absorber; or alternatively, the process may be performed,
the protective layer contains one or more inorganic blue light absorbers and one or more organic-inorganic hybrid blue light absorbers, and the functional layer contains one or more organic blue light absorbers.
16. The low-blue optical film for an LED lighting device according to claim 1, wherein a light stabilizer is further added to a layer containing the organic blue light absorber or the organic-inorganic hybrid blue light absorber.
17. The low blue light optical film for LED lighting devices according to claim 16, wherein said light stabilizer comprises bis (1, 2,6, -pentamethyl-4-piperidinyl) -sebacylic acid ester, hydroxyethyl tetramethyl piperidinol, 2- (2H-benzotriazol-2-yl) -6- (dodecyl) -4-methylphenol, rutile nano titanium dioxide.
18. The low blue optical film for LED lighting devices according to claim 16, wherein the light stabilizer is contained in an amount of 0.5 to 5% by weight of the coating liquid in the corresponding layer.
19. The low-blue optical film for an LED lighting device according to claim 1, wherein the thickness of said protective layer is 5 to 10 μm; the thickness of the functional layer is 10-25 mu m; the thickness of the substrate layer is 36-250 μm.
20. A low blue light diffusion sheet for an LED lighting device, wherein the low blue light diffusion sheet is one of the functional layers and the protective layers of the low blue light optical film for an LED lighting device according to any one of claims 1 to 19, which are a diffusion film functional layer and a diffusion film protective layer; in the low blue light diffusion sheet, the diffusion film functional layer and the diffusion film protective layer further comprise resin, curing agent and microparticles.
21. The low blue light diffusion sheet for an LED lighting device according to claim 20, wherein said resin comprises a polyacrylate resin or a urethane acrylate resin;
the curing agent comprises a polyurethane curing agent or an isocyanate curing agent;
the microparticles comprise one or a combination of several of acrylic resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyacrylonitrile or polyimide.
22. The low blue light diffusion sheet for an LED lighting device according to claim 21, wherein said fine particles are polymethyl methacrylate or polybutyl methacrylate.
23. The low blue light diffusion sheet for LED lighting devices according to claim 21, wherein said fine particles have a particle diameter of 3 to 20 μm.
24. A method of producing a low blue light diffusion sheet for an LED lighting device as defined in any one of claims 20 to 23, comprising the steps of:
(1) Preparing a protective layer coating liquid and a functional layer coating liquid respectively;
(2) Then coating a functional layer on one surface of the substrate layer, drying and rolling; coating a protective layer on the other side;
(3) And curing, cooling, cutting and slicing to obtain the low blue light diffusion sheet.
25. An LED lighting device comprising the low blue diffusion sheet for an LED lighting device according to any one of claims 20 to 23.
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| CN110687716A (en) * | 2018-07-04 | 2020-01-14 | 深圳Tcl新技术有限公司 | Backlight module |
| CN112391048A (en) * | 2020-11-18 | 2021-02-23 | 上海伟星光学有限公司 | Polyurethane lens with infrared and blue light prevention function and manufacturing method thereof |
| CN115521523A (en) * | 2022-09-15 | 2022-12-27 | 青岛上雅家居用品股份有限公司 | Hose with blue light prevention function and preparation method thereof |
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Address after: No. 196 Hezhan Road, Caojing Town, Jinshan District, Shanghai, 201507 Applicant after: CCS (SHANGHAI) FUNCTIONAL FILMS INDUSTRY CO.,LTD. Address before: No. 188 Hezhan Road, Caojing Town, Jinshan District, Shanghai, 201507 Applicant before: CCS (SHANGHAI) FUNCTIONAL FILMS INDUSTRY CO.,LTD. |
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Address after: No. 196 Hezhan Road, Caojing Town, Jinshan District, Shanghai, 201507 Applicant after: Kaixinsen (Shanghai) functional film industry Co.,Ltd. Address before: No. 196 Hezhan Road, Caojing Town, Jinshan District, Shanghai, 201507 Applicant before: CCS (SHANGHAI) FUNCTIONAL FILMS INDUSTRY Co.,Ltd. |
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Denomination of invention: A low blue light optical thin film for LED lighting devices and its preparation method Granted publication date: 20230721 Pledgee: Shanghai Jinshan Petrochemical sub branch of China Construction Bank Co.,Ltd. Pledgor: Kaixinsen (Shanghai) functional film industry Co.,Ltd. Registration number: Y2024980012734 |