CN113372757A - Ultraviolet light curing printing ink - Google Patents
Ultraviolet light curing printing ink Download PDFInfo
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- CN113372757A CN113372757A CN202110863989.9A CN202110863989A CN113372757A CN 113372757 A CN113372757 A CN 113372757A CN 202110863989 A CN202110863989 A CN 202110863989A CN 113372757 A CN113372757 A CN 113372757A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
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Abstract
The invention provides ultraviolet curing ink, which mainly comprises a light curing resin, a reactive diluent and a photoinitiator, wherein the total amount of the ultraviolet curing ink is taken as a reference, and the photoinitiator comprises an alpha-hydroxy ketone short-wavelength light initiator, an alpha-amino ketone long-wavelength light initiator and an oxime ester photoinitiator. The photoinitiator in the formula of the ink not only improves the photoinitiation efficiency and the curing efficiency, but also solves the orange peel phenomenon on the surface of the ink and also improves the adhesive force between the ink and the substrate. Further, the photoinitiator may be added with an epoxy silane coupling agent, thereby achieving dual curing of ultraviolet light and moisture.
Description
Technical Field
The present invention relates to the field of photocuring technology, and particularly to an ultraviolet curing ink.
Background
The light curing technology has the characteristics of high efficiency, environmental protection, energy conservation, wide applicability and the like, and is rapidly developed in recent years. Taking the wearable device as an example, the display module can be coated with black uv curable ink on the periphery of the multi-layered lens module to prevent light from entering the display module to cause product failure or affect the display effect. The ultraviolet curing ink mainly comprises light curing resin, reactive diluent, photoinitiator and auxiliary agent. Wherein the light-cured resin is a matrix resin of the ultraviolet light-cured ink and has a group capable of light curing. The reactive diluent is mainly used for adjusting the viscosity of the light-cured resin and participating in the light-curing process. The photoinitiator has the functions of absorbing photons with specific wavelengths under the irradiation of ultraviolet light to generate free radicals or cations, initiating the polymerization reaction of the active diluent and the photocuring resin, and generating a high-molecular polymer with a net structure in a very short time so as to realize photocuring.
The conventional UV curable ink photoinitiators include alpha-hydroxy ketone short wavelength curing photoinitiators, alpha-amino ketone long wavelength curing photoinitiators, and acylphosphine oxide long wavelength curing photoinitiators. The common commercial photoinitiator is a single type of photoinitiator, or a plurality of different photoinitiators are added to excite the light at different wavelengths, so as to improve the photoinitiation efficiency and the curing efficiency. However, after the ultraviolet light curing ink is subjected to photocuring, the phenomenon that the surface and deep layer of the thicker ink are not consistent, cracks and orange peel are generated, and the product fails. Therefore, the process of uv curable ink reduces the occurrence probability of orange peel by reducing the illumination of the uv lamp and improving the uniformity of the thickness of the ink, but has limited success, strict requirements on the process, and increased production cycle. The curing of the ultraviolet curing ink is influenced by the total energy of the ultraviolet light source and the energy distribution of light with different wavelengths, so that the photoinitiator in the ultraviolet curing ink material plays an important role in the curing process.
Therefore, it is an urgent subject to be researched and developed by those skilled in the art to improve the photoinitiator in the uv curable ink formulation to overcome the above-mentioned deficiencies of the prior art.
Disclosure of Invention
In view of the above, the present invention provides an ultraviolet curable ink, which is prepared by adjusting a photoinitiator in an ultraviolet curable ink formulation to improve the phenomena of orange peel on the surface and poor adhesion after the ink is cured.
In order to achieve the above object, the present invention provides an ultraviolet curable ink, which includes a photocurable resin, a reactive diluent, and a photoinitiator, wherein the photoinitiator includes the following components based on the total amount of the ultraviolet curable ink:
0.1-5 wt% of an alpha-hydroxyketone short-wavelength photoinitiator;
0.1-5 wt% of an alpha-aminoketone long-wavelength photoinitiator; and
0.1-5 wt% of oxime ester photoinitiator.
According to an embodiment of the present invention, the α -hydroxy ketone type short wavelength photoinitiator is selected from one or more of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl phenyl propanone and 1,1' - (methylenebis-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-propanone ].
According to an embodiment of the present invention, the aforementioned long wavelength photoinitiator of the alpha-aminoketone type is selected from one or more of 2-methyl-1- [ 4-methylthiophenyl ] -2-morpholinyl-1-propanone, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinylbenzyl-phenyl) butanone and 2-dimethylamino-2- (4-methyl-benzyl) -1- (4-morpholin-4-ylphenyl) -butan-1-one.
According to an embodiment of the present invention, the oxime ester photoinitiator is selected from one or more of 1- [4- (phenylthio) phenyl ] -1, 2-octanedione 2 (O-benzoyl oxime) and 1- [ 9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl ] ethanone 1- (O-acetyl oxime).
According to an embodiment of the present invention, the α -hydroxyketone short wavelength photoinitiator is 1,1' - (methylenebis-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-propanone ], the α -aminoketone long wavelength photoinitiator is 2-methyl-1- [ 4-methylthiophenyl ] -2-morpholinyl-1-propanone, and the oxime ester photoinitiator is 1- [ 9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl ] ethanone 1- (O-acetyloxime).
According to the embodiment of the invention, the photoinitiator comprises the following components based on the total amount of the ultraviolet curing ink:
0.5-1 wt% of an alpha-hydroxyketone short-wavelength photoinitiator;
1-2 wt% of an alpha-aminoketone long-wavelength photoinitiator; and
0.5-1 wt% of oxime ester photoinitiator.
According to the embodiment of the present invention, the photoinitiator further comprises 0.1 to 10 wt% of an epoxy silane coupling agent based on the total amount of the UV curable ink.
According to the embodiment of the present invention, the photoinitiator includes 0.5 to 2 wt% of an epoxy silane coupling agent based on the total amount of the UV curable ink.
According to an embodiment of the present invention, the epoxysilane coupling agent is one or more selected from the group consisting of 3- (2, 3-glycidoxy) propyltrimethoxysilane, 3- (2, 3-glycidoxy) propyltriethoxysilane, 3- (2, 3-glycidoxy) propylmethyldimethoxysilane, 3- (2, 3-glycidoxy) propylmethyldiethoxysilane, 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane and 2- (3, 4-epoxycyclohexane) ethyltriethoxysilane.
According to an embodiment of the present invention, the epoxy silane coupling agent is 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane.
According to an embodiment of the present invention, the UV curable ink includes 35 to 60 wt% of a photo-curable resin and 25 to 45 wt% of a reactive diluent, based on the total amount of the UV curable ink.
According to an embodiment of the present invention, the uv curable ink further includes one or more of a pigment, an auxiliary agent and a non-reactive diluent.
According to an embodiment of the present invention, the UV curable ink includes 8 to 10 wt% of pigment based on the total amount of the UV curable ink.
According to an embodiment of the present invention, the uv curable ink includes 5 to 10 wt% of an auxiliary agent based on the total amount of the uv curable ink, and the auxiliary agent is one or more selected from a defoaming agent, a leveling agent, a wetting dispersant, a thixotropic agent, an adhesion promoter, a polymerization inhibitor, and a wax.
According to an embodiment of the present invention, the UV curable ink includes 2 to 5 wt% of an inert diluent based on the total amount of the UV curable ink.
Compared with the prior art, the invention has the following advantages:
1. the formula of the ultraviolet curing ink provided by the invention is that the high-sensitivity oxime ester photoinitiator is added on the basis of the short-wavelength photoinitiator and the long-wavelength photoinitiator, so that the phenomena of orange peel on the surface and poor adhesive force generated after the ink is cured can be avoided, the appearance of the product is attractive, and the service life of the product is prolonged.
2. The ultraviolet curing ink provided by the invention can improve the problem of oxygen inhibition on the surface of the coating by introducing the oxime ester photoinitiator into the formula.
3. The ultraviolet curing ink provided by the invention can achieve ultraviolet/moisture dual curing by changing the curing basic principle of the ink, so that the requirement on the thickness of the ink in the manufacturing process is relaxed, the curing speed does not need to be particularly reduced, and the production period of products is shortened.
The purpose, technical content, features and effects of the present invention will be more readily understood through the detailed description of the embodiments below.
Drawings
FIGS. 1 to 3 are absorption spectra of three components of the photoinitiator used in the present invention, which are an α -hydroxyketone short-wavelength photoinitiator, an α -aminoketone long-wavelength photoinitiator, and an oxime ester photoinitiator, respectively.
FIG. 4 is a laser scanned image of the cured surface of the UV curable ink of comparative example one.
FIG. 5 is a laser scanned image of the cured surface of the UV curable ink of comparative example two.
Fig. 6 is a laser scanning image of the cured surface of the uv curable ink according to the first embodiment.
FIG. 7 is a laser scanned image of the cured surface of the UV curable ink of example two.
FIG. 8 is a comparison of the rating criteria for the performance of the hundred grid test.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict.
As described in the prior art, the currently known uv curable ink is prone to orange peel after curing. In order to solve the technical problems, the basic idea of the present invention is to provide a uv curable ink, and to improve the photoinitiator in the formulation of the uv curable ink. The main components of the ultraviolet curing ink are light curing resin, reactive diluent and photoinitiator, and optional auxiliary components are one or more of pigment, auxiliary agent and non-reactive diluent. In one embodiment of the present invention, the photoinitiator comprises the following components based on the total amount of the uv curable ink:
0.1-5 wt% of an alpha-Hydroxy Ketones short wavelength photoinitiator;
0.1-5 wt% of an alpha-aminoketone (alpha-amino Ketones) long-wavelength photoinitiator; and
0.1-5 wt% of Oxime ester (Oxime esters) photoinitiator.
Further, in a preferred embodiment of the present invention, the photoinitiator comprises the following components based on the total amount of the uv curable ink:
0.5-1 wt% of an alpha-hydroxyketone short-wavelength photoinitiator;
1-2 wt% of an alpha-aminoketone long-wavelength photoinitiator; and
0.5-1 wt% of oxime ester photoinitiator.
The alpha-hydroxy ketone short wavelength photoinitiator used in the invention is selected from one or more of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone and 1,1' - (methylenebis-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-acetone ]. The alpha-aminoketone long-wavelength photoinitiator used in the invention is selected from one or more of 2-methyl-1- [ 4-methylthiophenyl ] -2-morpholinyl-1-acetone, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinylbenzyl phenyl) butanone and 2-dimethylamino-2- (4-methyl-benzyl) -1- (4-morpholin-4-ylphenyl) -butane-1-ketone. The oxime ester photoinitiator used in the invention is one or more selected from 1- [4- (phenylthio) phenyl ] -1, 2-octane dione 2 (O-benzoyl oxime) and 1- [ 9-ethyl-6- (2-methylbenzoyl) -9H-carbazole-3-yl ] ethanone 1- (O-acetyl oxime). In one embodiment of the present invention, the α -hydroxyketone short wavelength photoinitiator is 1,1' - (methylenebis-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-propanone ], the α -aminoketone long wavelength photoinitiator is 2-methyl-1- [ 4-methylthiophenyl ] -2-morpholinyl-1-propanone, and the oxime ester photoinitiator is 1- [ 9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl ] ethanone 1- (O-acetyloxime), but the practice is not limited to this combination. The materials used for the components of the photoinitiator and their chemical structures are shown in the following table:
watch 1
FIGS. 1 to 3 show the absorption band ranges of three components of the photoinitiator used in the present invention, which are, in order, an α -hydroxyketone short-wavelength photoinitiator, an α -aminoketone long-wavelength photoinitiator, and an oxime ester photoinitiator, wherein the α -hydroxyketone short-wavelength photoinitiator is 1,1' - (methylenedi-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-propanone ], the α -aminoketone long-wavelength photoinitiator is 2-methyl-1- [ 4-methylthiophenyl ] -2-morpholinyl-1-propanone, and the oxime ester photoinitiator is 1- [ 9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl ] ethanone 1- (O-acetyloxime) For example. The absorption band of the photoinitiator has a certain relationship with the concentration of the photoinitiator, where the boundaries are 0.01g/L and 0.5g/L of the concentration of the photoinitiator in acetonitrile, and in the present invention, the photoinitiator content is 0.5g/L or more, so the curve of 0.5g/L is used as a standard.
According to the invention, the alpha-hydroxy ketone short-wavelength photoinitiator and the alpha-amino ketone long-wavelength photoinitiator are added in the formula of the ultraviolet curing ink, so that more active free radicals can be split, the polymerization of the light curing resin is initiated, the ink is crosslinked and cured, and the ink can be uniformly cured in different thicknesses. The alpha-aminoketone long-wavelength photoinitiator can penetrate through the surface layer to cure the deep layer, so that the inactive diluent in the printing ink can uniformly volatilize and the contraction condition is consistent, and the orange peel phenomenon is effectively avoided. In addition, because the conventional photoinitiators generally have the defects of low sensitivity (the polymerization rate and the conversion rate of photosensitive materials are reduced), poor solubility (the transparency of the photosensitive materials is reduced) and the like, the oxime ester photoinitiators can solve the problems to a great extent. Therefore, after the oxime ester photoinitiator is added into the ultraviolet curing ink, the ultraviolet curing ink has high sensitivity, the occurrence of surface oxygen inhibition is improved, the surface defects of orange peel, shrinkage cavity and the like can be further avoided, and the overall performance of the ink is improved.
If the requirement on the thickness of the ink is high, the ultraviolet curing ink formula provided by the invention can further add an epoxy silane coupling agent into a photoinitiator so as to realize ultraviolet/moisture dual curing. In a preferred embodiment of the present invention, the photoinitiator comprises the following components based on the total amount of the uv curable ink:
0.1-5 wt% of an alpha-hydroxyketone short-wavelength photoinitiator;
0.1-5 wt% of an alpha-aminoketone long-wavelength photoinitiator;
0.1-5 wt% of oxime ester photoinitiator; and
0.1 to 10% by weight of an epoxy silane coupling agent.
Further, in a preferred embodiment of the present invention, the photoinitiator comprises the following components based on the total amount of the uv curable ink:
0.5-1 wt% of an alpha-hydroxyketone short-wavelength photoinitiator;
1-2 wt% of an alpha-aminoketone long-wavelength photoinitiator;
0.5-1 wt% of oxime ester photoinitiator; and
0.5 to 2% by weight of an epoxy silane coupling agent.
The principle of the invention that the photoinitiator contains the epoxy silane coupling agent to realize ultraviolet/moisture dual curing is that based on the fact that a thin water layer is adsorbed on the surface of a material in the atmosphere, alkoxy at one end of the epoxy silane coupling agent is hydrolyzed into silicon hydroxyl which is oriented on the surface of an inorganic material, and simultaneously, the silicon hydroxyl and the hydroxyl on the surface of the material are subjected to polycondensation reaction, organic groups are oriented on the surface of an organic material, and the organic groups are subjected to chemical reaction in the cross-linking curing process, so that the coupling process between dissimilar materials is completed. The epoxy silane coupling agent used in the invention utilizes the ultraviolet curing effect to quickly set the ink or achieve surface drying, and simultaneously generates moisture curing to completely cure the bottom layer part, thereby achieving the effect of completely curing the ink under the thicker condition.
The epoxy silane coupling agent used in the invention is selected from 3- (2, 3-epoxypropoxy) propyl trimethoxy silane, 3- (2, 3-epoxypropoxy) propyl triethoxy silane, 3- (2, 3-epoxypropoxy) propyl methyl dimethoxy silane and 3- (2, 3-epoxypropoxy) propyl methyl diethoxy silane; 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane and 2- (3, 4-epoxycyclohexane) ethyltriethoxysilane. In a preferred embodiment of the present invention, the epoxysilane coupling agent is 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane.
The photoinitiator is used as a component of the ultraviolet curing ink, so that the problem of orange peel on the surface of the ink is effectively solved, and the comprehensive performance of the ink is improved. Further, the photoinitiator used in the present invention can be applied to substrates of various uv curable inks, and specifically, the uv curable ink may include 35 to 60 wt% of a photocurable resin and 25 to 45 wt% of a reactive diluent, wherein the photocurable resin is used as a matrix resin having a group that can be photocured, for example, epoxy resin, acrylic resin, methacrylic resin, etc.; the reactive diluent is a low-viscosity monomer resin, has a regulating effect on the viscosity of the photocurable resin, and participates in the photocuring reaction, for example, dipropylene glycol diacrylate, glycerol propoxylate triacrylate, monofunctional acrylate, etc. One or more of pigments, auxiliaries and non-reactive diluents can be optionally added to the auxiliary components of the UV-curable ink formulation. The ultraviolet curing ink can comprise 8-10 wt% of pigment, wherein the pigment generally has small light absorptivity to ultraviolet light and does not change color under the irradiation of the ultraviolet light or during curing reaction, such as titanium dioxide, benzidine yellow, phthalocyanine blue, carbon black and the like; the ultraviolet curing ink can comprise 2-5 wt% of an inactive diluent, wherein the inactive diluent is a low-molecular-weight organic solvent, does not participate in a curing reaction, and can be volatilized after being heated, such as ethanol, acetone, toluene and the like; the ultraviolet light curing ink can comprise 5-10 wt% of auxiliary agents, and the auxiliary agents can be one or more selected from defoaming agents, flatting agents, wetting dispersing agents, thixotropic agents, adhesion promoters, polymerization inhibitors and waxes, so that the physical or chemical properties of the ink in manufacturing and use are improved.
The present invention will be described in further detail and the effects thereof will be verified by referring to the following specific examples and comparative examples, which should not be construed as limiting the scope of the present invention, and the test methods and standards for verifying the same are as follows:
the specific compositions of the UV curable inks of examples one and two and comparative examples one and two provided by the present invention are shown in Table two. The UV-curable ink base with the same composition and the same composition ratio is adopted for each group, and the difference is only in the components of the added photoinitiator. As shown in the first and second comparative examples in Table II, the conventional art employs a short wavelength photoinitiator or a combination of a short wavelength photoinitiator and a long wavelength photoinitiator. As shown in the first embodiment in Table II, the photoinitiator used in the present invention is an oxime ester photoinitiator added on the basis of an alpha-hydroxy ketone short wavelength photoinitiator and an alpha-amino ketone long wavelength photoinitiator. As shown in the second embodiment in Table II, the present invention is obtained by adding an epoxy silane coupling agent to the above three components in the first embodiment. Regardless of whether one or more components of the photoinitiator are used, the total amount of photoinitiator used in comparative examples one, two and example one is the same, except that in example two an additional amount of epoxy silane coupling agent is added.
Watch two
Note one: the diluent in the second table comprises a reactive diluent and a non-reactive diluent, and the proportions are respectively as follows: non-reactive diluents: 2-5%, active diluent: 25-45%.
Note one: the isocyanate resin in Table II is used as an auxiliary agent. Because the isocyanate resin contains unsaturated bonds in the structure and has high activity, the extensibility, solvent resistance and adhesive force of the ink can be improved after the isocyanate resin is added.
The test mode is as follows:
firstly, in order to confirm the light shielding effect and the surface smoothness of the ultraviolet curing ink on the display equipment, the following tests are carried out:
1. and spraying ultraviolet curing ink on the transparent glass substrate and curing.
2. The optical density (OD value) of the UV curable ink was measured by a densitometer X-rite 361.
3. And testing the roughness of the surface of the ultraviolet curing ink by using a laser scanning microscope VK X1100.
Secondly, in order to confirm the bonding force effect of the ultraviolet curing ink on the substrate, the following tests are carried out:
1. uv curable ink was sprayed on the substrates and cured, and two substrates (PMMA and COC) were tested separately.
2. And carrying out a hundred-grid test on the cured ultraviolet curing ink.
3. And (4) carrying out grade judgment according to the falling condition of the ultraviolet curing ink.
4. If the grade is 4B or more, the adhesion is considered to be good.
And (3) testing results:
the test results for each group of UV curable inks are shown in Table three. Referring to fig. 4 to 7, the surface images of the uv curable inks of the respective groups after curing are respectively observed by using a laser scanning microscope, and the images are sequentially shown in comparative example a, comparative example b, example a and example b to determine whether the cured ink surface has an orange peel phenomenon. Referring to fig. 8, a comparison chart of the grade evaluation criteria for the hundred-grid test is shown, wherein x represents the percentage of ink dropout after the hundred-grid test.
Watch III
Through the above test results, it is demonstrated that the curing effects of the first and second embodiments of the present invention are better, and the photoinitiator in the first embodiment includes an α -hydroxyketone short wavelength photoinitiator, an α -aminoketone long wavelength photoinitiator, and a highly sensitive oxime ester photoinitiator, which not only avoids the orange peel phenomenon on the surface of the ink, but also improves the adhesion between the ink and the substrate. In the second embodiment, an epoxy silane coupling agent is added on the basis of the first embodiment, so that the ink can be cured by ultraviolet light/moisture under a thick condition, and a complete curing effect is achieved.
In summary, according to the ultraviolet light curing ink provided by the invention, the photoinitiator in the formula is the oxime ester photoinitiator with high sensitivity added on the basis of the alpha-hydroxy ketone short wavelength photoinitiator and the alpha-amino ketone long wavelength photoinitiator, so that the photoinitiation efficiency and the curing efficiency are improved, the orange peel phenomenon on the surface of the ink is solved, the adhesion force between the ink and the substrate is improved, the appearance of the product is attractive, and the service life of the product is prolonged. Moreover, if the requirement on the thickness of the printing ink is higher, the invention can further add an epoxy silane coupling agent into the photoinitiator, and can realize ultraviolet light/moisture dual curing, so that the requirement on the thickness of the printing ink in the manufacturing process is relaxed, and the curing rate does not need to be particularly reduced, thereby shortening the production period of products.
The ultraviolet curing ink glass is suitable for being coated on substrates comprising glass, PMMA (polymethyl methacrylate), COC (chip on glass) and the like, but is not limited to the range, can be applied to display modules, lens modules, curved screen modules and related electronic products, and can avoid the orange peel phenomenon of thicker ink after curing, thereby improving the quality and reliability of the products and enhancing the market competitiveness.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all the equivalent changes or modifications according to the features and the spirit described in the scope of the application of the present invention should be included in the scope of the application of the present invention.
Claims (15)
1. The ultraviolet curing ink is characterized by comprising a light curing resin, a reactive diluent and a photoinitiator, wherein the photoinitiator comprises the following components based on the total amount of the ultraviolet curing ink:
0.1-5 wt% of an alpha-hydroxyketone short-wavelength photoinitiator;
0.1-5 wt% of an alpha-aminoketone long-wavelength photoinitiator; and
0.1-5 wt% of oxime ester photoinitiator.
2. The UV-curable ink according to claim 1, wherein the α -hydroxyketone type short wavelength photoinitiator is selected from one or more of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone, and 1,1' - (methylenebis-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-propanone ].
3. The uv curable ink according to claim 1, wherein the long wavelength photoinitiator of the alpha-aminoketone is selected from one or more of 2-methyl-1- [ 4-methylthiophenyl ] -2-morpholino-1-propanone, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinobenzylphenyl) butanone, and 2-dimethylamino-2- (4-methyl-benzyl) -1- (4-morpholin-4-ylphenyl) -butan-1-one.
4. The UV curable ink according to claim 1, wherein the oxime ester photoinitiator is one or more selected from the group consisting of 1- [4- (phenylthio) phenyl ] -1, 2-octanedione 2 (O-benzoyloxime) and 1- [ 9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl ] ethanone 1- (O-acetyloxime).
5. The UV-curable ink according to claim 1, wherein the α -hydroxyketone short-wavelength photoinitiator is 1,1' - (methylenebis-4, 1-phenylene) bis [ 2-hydroxy-2-methyl-1-propanone ], the α -aminoketone long-wavelength photoinitiator is 2-methyl-1- [ 4-methylthiophenyl ] -2-morpholinyl-1-propanone, and the oxime ester photoinitiator is 1- [ 9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl ] ethanone 1- (O-acetyloxime).
6. The uv curable ink according to claim 1, wherein the photoinitiator comprises the following components based on the total amount of the uv curable ink:
0.5-1 wt% of the alpha-hydroxyketone short-wavelength photoinitiator;
1-2 wt% of the alpha-aminoketone long-wavelength photoinitiator; and
0.5-1 wt% of the oxime ester photoinitiator.
7. The UV curable ink according to claim 1, wherein the photoinitiator further comprises 0.1 to 10 wt% of an epoxy silane coupling agent, based on the total amount of the UV curable ink.
8. The UV curable ink according to claim 7, wherein the photoinitiator comprises 0.5 to 2 wt% of the epoxy silane coupling agent, based on the total amount of the UV curable ink.
9. The UV curable ink according to claim 7, wherein the epoxysilane coupling agent is one or more selected from the group consisting of 3- (2, 3-glycidoxy) propyltrimethoxysilane, 3- (2, 3-glycidoxy) propyltriethoxysilane, 3- (2, 3-glycidoxy) propylmethyldimethoxysilane, 3- (2, 3-glycidoxy) propylmethyldiethoxysilane, 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane and 2- (3, 4-epoxycyclohexane) ethyltriethoxysilane.
10. The UV curable ink according to claim 7, wherein the epoxysilane coupling agent is 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane.
11. The UV curable ink according to claim 1, wherein the UV curable ink comprises 35 to 60 wt% of the photocurable resin and 25 to 45 wt% of the reactive diluent, based on the total amount of the UV curable ink.
12. The uv curable ink according to claim 1, further comprising one or more of a pigment, an auxiliary agent and a non-reactive diluent.
13. The uv curable ink according to claim 12, wherein the uv curable ink includes 8 to 10 wt% of the pigment based on the total amount of the uv curable ink.
14. The UV curable ink according to claim 12, wherein the UV curable ink comprises 5 to 10 wt% of the auxiliary agent, based on the total amount of the UV curable ink, and the auxiliary agent is one or more selected from the group consisting of an antifoaming agent, a leveling agent, a wetting dispersant, a thixotropic agent, an adhesion promoter, a polymerization inhibitor, and a wax.
15. The uv curable ink according to claim 12, wherein the uv curable ink includes 2 to 5 wt% of the non-reactive diluent based on the total amount of the uv curable ink.
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| CN202110863989.9A CN113372757A (en) | 2021-07-29 | 2021-07-29 | Ultraviolet light curing printing ink |
| TW110128552A TW202304849A (en) | 2021-07-29 | 2021-08-03 | Ultraviolet curable ink |
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