CN111320897A - UV transparent ink for prism type reflective film spray painting - Google Patents
UV transparent ink for prism type reflective film spray painting Download PDFInfo
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- CN111320897A CN111320897A CN202010303498.4A CN202010303498A CN111320897A CN 111320897 A CN111320897 A CN 111320897A CN 202010303498 A CN202010303498 A CN 202010303498A CN 111320897 A CN111320897 A CN 111320897A
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- Prior art keywords
- ink
- reflective film
- spray painting
- prism
- transparent ink
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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
- C09D11/30—Inkjet printing inks
-
- 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
Abstract
The invention relates to UV transparent ink for prism type reflective film spray painting, which comprises 45-65% of photopolymerisable monofunctional monomer, 15-35% of photopolymerisable polyfunctional monomer, 5-12% of acylphosphine photopolymerization initiator, 7-15% of UV ink base material, 4-8% of photosensitizer and 1-3% of mixed auxiliary agent by mass percent; wherein the photopolymerizable monofunctional monomer and the photopolymerizable polyfunctional monomer comprise a photopolymerizable monomer having at least one functional group including an amide group and an amino group. The invention has the advantages of excellent curing property, stable spraying, low cost, high production efficiency and strong weather resistance.
Description
Technical Field
The invention belongs to the technical field of reflective films, and particularly relates to UV transparent ink for prism type reflective film spray painting.
Background
At present, the traffic sign made of prism-type reflective films on the market mainly comprises screen-printed patterns, the reflective films with different colors are used for carving and pasting the patterns, and a large-scale flat-plate inkjet printer is used for integrally forming the inkjet patterns. The pollution of the silk-screen printing pattern to the environment is high, the ink is easy to be absorbed into the human body after being volatilized, the pattern printing process is more and complicated, and the production efficiency is low. The splicing and pasting method after pattern engraving has no pollution to the environment, but has great waste to materials and higher production cost. Compared with the former two methods, the production cost of the flat spray drawing can be saved by more than 70 percent, and the production efficiency is extremely high.
Although UV ink jet printing has high production efficiency and excellent performance, the UV ink on the market belongs to reactive ink, and each UV ink has a unique chemical composition, which is determined by the technology of manufacturers. The UV printing ink of different manufacturers is different in blending on a color system, optimal blending is not carried out on the prism type reflecting film, and different effects of the same scheme on the prism type reflecting film are determined.
The UV printing ink contains a photosensitizer, has high viscosity, can be sprayed and dried by ultraviolet curing, is fast in curing, has rich color and luster, is strong in stereoscopic impression and has excellent color expressive force. However, when the patterns or marks are painted on the prism-type reflective film, the ink on the surface of the patterns or marks is matte after being cured, and is not smooth enough. The retroreflection spray painting area is diffuse reflection after light enters the prism type reflective film, and the mirror reflection in the non-spray painting area forms obvious retroreflection performance difference, so that dark spots are formed when a mark or a pattern is seen at night, the retroreflection performance of the prism type reflective film is obviously reduced under the condition, and the warning effect of the prism type reflective film is reduced to a certain extent, so that hidden danger is brought to traffic traveling safety. And the defects of high cost and poor weather resistance exist in the existing UV ink spray-painting on the prism type reflective film.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the UV transparent ink for prism type reflective film spray painting, which can reduce the retroreflection performance difference between a prism type reflective film spray painting area and an undrawn area, has excellent curing performance and spray stability by Ultraviolet (UV) irradiation in a spray painting machine, and ensures the basic reversible reflection performance of the prism type reflective film. The invention has the advantages of low cost, high production efficiency and strong weather resistance.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the UV transparent ink for prism type reflective film spray painting comprises, by mass, 45-65% of photopolymerisable monofunctional monomer, 15-35% of photopolymerisable polyfunctional monomer, 5-12% of acylphosphine photopolymerization initiator, 7-15% of UV ink base material, 4-8% of photosensitizer and 1-3% of mixed auxiliary agent;
wherein the photopolymerizable monofunctional monomer and the photopolymerizable polyfunctional monomer comprise a photopolymerizable monomer having at least one functional group including an amide group and an amino group.
The principle of the invention is that ultraviolet light emitted by an inkjet printer is used as energy to trigger UV transparent ink to be rapidly converted into solid patterns.
The monofunctional monomer in the invention is one or more of benzyl methacrylate, isobornyl acrylate or methacrylamide.
The polyfunctional monomer in the present invention is neopentyl glycol di (meth) acrylate and/or propylene glycol di (meth) acrylate.
The content of the photopolymerizable monofunctional monomer in the invention influences the curing speed of the product, and the content of the monofunctional monomer is controlled to improve the curing viscosity of the UV transparent ink. The content of the photopolymerizable polyfunctional monomer affects the adhesiveness of the inkjet pattern.
The UV transparent ink can utilize ultraviolet light (UV) emitted by a special curing lamp of an inkjet printer, the spectral range of the UV transparent ink is 350-385 nm, the main peak value is 365nm, and the inkjet distance is controlled to be 0.8-1.2 cm. The wavelength of radiation emitted by ultraviolet light emitted by a curing lamp special for the inkjet printer is accurately controlled, and the purpose is to ensure that the UV printing ink can better penetrate into the surface of the prism-shaped reflective film at the wavelength effective for curing the UV printing ink, so that the UV printing ink can be dried and cured in the spectral range, the ink can obtain the photoinitiator mass fraction with higher curing rate, and the curing rate is improved.
In the invention, an acylphosphine photopolymerization initiator is adopted, and when the acylphosphine photopolymerization initiator receives ultraviolet light with specific wavelength in the total wavelength range of 365-385nm, the transparent ink composition is polymerized into a polymer. The acylphosphine photopolymerization initiator has the characteristics of low migration, low volatility, no odor and low yellowing, and the structure of the bifunctional group ensures that the initiation activity of the acylphosphine photopolymerization initiator is equivalent to that of a micromolecular acylphosphine photoinitiator. The aromatic ring in the molecular structure of the initiator is coupled with a tertiary amine structure, the absorption wavelength is red-shifted under the action of strong co-regions, and the initiator has strong absorption at the wavelength of ultraviolet radiation and can effectively generate free radicals to initiate the rapid polymerization of the resin monomer. In the UV transparent ink composition, the acylphosphine photopolymerization initiator may be used in combination with other photoinitiators such as benzoin and derivatives, alkylbenzophenones, benzophenones, etc., without affecting the performance.
The photosensitizer in the invention adopts ITX photosensitizer, which is used for UV polymerization curing together with compounding agent to enhance the curing efficiency of UV.
In the present invention, as the organic solvent, an alkyl alcohol such as methanol, ethanol, n-propanol, isopropanol or the like; ethers such as tetrahydrofuran and the like; oxyethylene addition dimers such as diethylene glycol and the like; alkylene glycols having alkylene groups, such as ethylene glycol and the like, in any of these combinations. To better optimize the beneficial properties of the ink for transparency, isopropyl alcohol is preferred as the organic solvent because isopropyl alcohol promotes bubble formation and thus acts as a degassing agent to remove contaminant gases from the UV ink, while isopropyl alcohol inhibits foaming and helps to keep the surface tension of the ink within a suitable range. In addition, when ink is spray-painted onto the surface of the prism-type reflective film, the isopropanol helps to dissolve the coating on the surface of the prism-type reflective film, thus helping to enhance the bonding of the ink to the surface of the prism-type reflective film.
The acrylic resin in the invention can adopt methacrylate resin or modified methacrylate resin, and is required to have the characteristics of high fluidity and high transparency, and the yellowing index is about 0.8, the light transmittance at the thickness of 1.5mm is more than 93 percent, and the turbidity is less than 0.5, so that the transparency of the UV transparent ink is improved to a certain extent.
In order to ensure the high transparency of the ink, the pigment adopts the pigment with small particle size, about 0.2-0.3 mu m, the small particle size pigment can reduce the covering power of the ink and improve the rheological property, and the barrier effect is generated after the UV ink of the small particle size pigment is used for spraying and painting patterns, so that the penetration of air and moisture can be reduced, and the high transparency of the ink is improved to a certain extent. The UV transparent ink also minimizes the level of other contaminants in the pigment based on the high transparency value requirement, thereby helping to reduce the formation of deposits and blockages of contaminants on the jet head of the UV printer. To ensure a high transparency value of the ink, the liquid conductivity of the ink in this example should preferably be below 10 milliohms to further minimize the impurity content in the ink.
In order to further improve the product transparency, the pigment is matched with a small amount of high molecular dispersant, and the NUOSPERSE-FX9200 UV ink wetting dispersant is preferred.
The printing ink is provided with the mixing auxiliary agent, and the mixing auxiliary agent can be added with various additives such as a stabilizer, an anti-aging agent, a cross-linking agent, a polymerization inhibitor, a flatting agent, a defoaming agent and the like in a proper amount, so that the printing effect and the attractiveness are ensured.
The UV transparent ink of the present invention is preferably an ink having a viscosity of about 12 to 35 mpa · s at an operating temperature of 20 ℃ to 28 ℃ in order to enable high-speed ejection in an ink chamber of a UV inkjet printer. And under the above conditions, the ink can generate strong surface tension of about 60-75 dyne/cm after being sprayed on the surface of the prism-shaped reflective film and is inspected, the pattern is not easy to fall off, and the technical problems that the bonding force of the UV ink and the existing UV ink is poor and the surface tension is easy to attenuate are solved. Meanwhile, the low viscosity ensures that the spray head is not blocked and the spray efficiency is not blocked during spray painting, so that the spray painting effect is smooth and attractive.
Compared with the existing product, the invention has the following beneficial effects:
first, the invention improves the transparency of the existing products aiming at the existing defects, has high transparency, and reduces the shielding rate of the ink on the retroreflection performance of the prism-type reflecting film after the patterns are sprayed.
Secondly, the invention improves the existing ink jet printing effect, so that the return light is subjected to mirror reflection, the possibility of diffuse reflection is reduced, and the traffic safety performance is improved. And thirdly, compared with the existing product, the invention has the advantages of low production cost, strong weather resistance, long service life and high production efficiency. The service life of the product in natural environment after spray painting is not less than 36 months.
Fourthly, the invention can also be expanded to be used in the fields of ceramic tiles, wood, plastic films, wall painting portraits, lamp box advertisements, outdoor advertising boards and the like.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
The embodiment relates to a formula and composition of UV transparent ink for prism type reflective film spray painting, which comprises the following components: the UV ink comprises, by mass, 15% of benzyl methacrylate, 38% of isobornyl acrylate, 20% of neopentyl glycol di (meth) acrylate, 8% of acylphosphine photopolymerization initiator, 12% of UV ink base material, 5% of ITX type photosensitizer and 2% of mixing auxiliary agent.
The UV ink base in this example comprises 48% isopropyl alcohol, 28% NeoCryl-B302 solid acrylic resin, 23% pigment, 1% ink dispersant. Wherein the pigment particle size is 0.2 μm.
In this embodiment, the mixing aid includes an anti-aging agent, a crosslinking agent, a polymerization inhibitor, a leveling agent, and an antifoaming agent.
Example 2
The embodiment relates to a formula and composition of UV transparent ink for prism type reflective film spray painting, which comprises the following components:
| methacrylic acid benzyl ester | 40％ |
| UV ink base | 11％ |
| 4-ethylbenzoyldiphenylphosphine oxide | 9％ |
| Propylene glycol di (meth) acrylate | 15.5％ |
| Methacrylamide | 10％ |
| Acrylic acid isobornyl ester | 5.5 |
| ITX | 6.5％ |
| Mixing aid | 2.5％ |
| In total | 100％ |
In this example, the components and proportions of the UV ink base material include, by mass, 20% of yellow 151 pigment, 2% of NUOSPERSE-FX9200 UV ink wetting dispersant, 25% of methacrylic resin, and 57% of isopropyl alcohol. Dispersing and stirring the components according to the proportion to produce the UV ink base material.
In this embodiment, the mixing aid includes a sensitizer, a defoamer, a stabilizer and a leveling agent, which are prepared according to a ratio of 1:1:1:1, and are all types of products commonly used in ink manufacturing.
The pigment particle size in this example was 0.25. mu.m.
The preparation method of the UV transparent ink in this example is:
preparing a UV printing ink base material, then adding benzyl methacrylate, 4-ethylbenzoyl diphenylphosphine oxide, propylene glycol di (methyl) acrylate, methacrylamide, isobornyl acrylate, an ITX photosensitizer and a mixing auxiliary agent, and then uniformly stirring, grinding and uniformly dispersing to obtain the required UV printing ink. Then, the UV printing ink is vacuumized and pressurized, and air bubbles possibly mixed in during stirring are removed from the UV printing ink; finally, the ink is treated by ultrasonic waves, so that the uniform dispersion of the pigment in the ink is enhanced, and the residual entrained bubbles are removed finally.
Through tests, the working temperature of a UV inkjet printer used for inkjet printing is 25 ℃, and the viscosity of the UV transparent ink for inkjet printing of the prism type reflective film is 25 mPa.s measured by using an electronic rotational viscometer.
In the test of the embodiment, the UV transparent ink is filled into a UV inkjet printer, and ultraviolet light (UV) emitted by a curing lamp special for the inkjet printer has a spectral range of 350nm-380nm and a main peak value of 365 nm; and (4) carrying out spray painting at the speed of 54 square meters per hour and at the height of 1.0cm from the membrane surface, and carrying out the test after the spray painting is finished. The test method refers to the standard GB/T18833-.
The chroma performance test method comprises the following steps: a CIE standard illuminant DS 5 light source is adopted, the geometric condition of measurement is 45 degrees a:0 degrees, and chromaticity coordinates and luminance factors of daytime colors of various reflective films are measured. The test results are shown in Table 1.
The adhesion test method comprises the following steps: and (3) carrying out a grid marking method test on the prism type reflective film spray-painted area, and then continuously drawing the grid marking area for five times at the same position by using an adhesive tape.
The method for testing the impact performance comprises the following steps: and (3) carrying out free fall test on the prism type reflective film spray painting area at the height of 250mm by using a 450g weight.
The solvent resistance test method comprises the following steps: and (3) placing the spray painting area in gasoline and ethanol, and soaking for 10min and 1min respectively. The method for testing the weather resistance comprises the following steps: the ultraviolet accelerated ageing oven is used for artificially accelerating for 1800 hours, which corresponds to the natural exposure for 36 months. The test results are shown in Table 2.
The retroreflection performance test method comprises the following steps: the test was performed using a high-pass 933 retro-reflective tester using a coplanar geometry. The test results are shown in Table 3.
The test result shows that the reflection performance, the chromaticity performance, the impact resistance, the solvent resistance, the adhesion performance and the weather resistance of the UV transparent ink spray-painted on the prism type reflective film meet the requirements of the existing production application, and compared with other production processes, the UV transparent ink spray-painted on the prism type reflective film has higher efficiency and lower cost, better meets the current environmental protection requirement, and can generate good production gain.
TABLE 2
TABLE 3
Claims (9)
1. The UV transparent ink for prism type reflective film spray painting is characterized in that: the ink comprises, by mass, 45-65% of photopolymerisable monofunctional monomer, 15-35% of photopolymerisable polyfunctional monomer, 5-12% of acylphosphine photopolymerization initiator, 7-15% of UV ink base material, 4-8% of photosensitizer and 1-3% of mixed auxiliary agent;
wherein the photopolymerizable monofunctional monomer and the photopolymerizable polyfunctional monomer comprise a photopolymerizable monomer having at least one functional group including an amide group and an amino group.
2. The UV transparent ink for spray painting of the prism-shaped reflective film as claimed in claim 1, which is characterized in that: the UV ink base material comprises 38-62% of organic solvent, 20-30% of acrylic resin, 15-30% of pigment and 1-3% of ink dispersant.
3. The UV transparent ink for spray painting of the prism-shaped reflective film as claimed in claim 1, which is characterized in that: the mixing auxiliary agent at least comprises a leveling agent and a defoaming agent.
4. The UV transparent ink for spray painting of the prism-shaped reflective film as claimed in claim 1, which is characterized in that: the monofunctional monomer is one or more of benzyl methacrylate, isobornyl acrylate or methacrylamide.
5. The UV transparent ink for spray painting of the prism-shaped reflective film as claimed in claim 1, which is characterized in that: the polyfunctional monomer is neopentyl glycol di (meth) acrylate and/or propylene glycol di (meth) acrylate.
6. The UV transparent ink for spray painting of the prism-shaped reflective film as claimed in claim 2, which is characterized in that: the light transmittance of the acrylate resin is not less than 93% when the thickness of the acrylate resin is 1.5mm, and the turbidity is less than 0.5.
7. The UV transparent ink for spray painting of the prism-shaped reflective film as claimed in claim 2, which is characterized in that:
the particle size of the pigment is 0.2-0.3 μm.
8. The UV transparent ink for spray painting of the prism-shaped reflective film as claimed in claim 1, which is characterized in that: the organic solvent is isopropanol.
9. The UV transparent ink for spray painting of the prism-shaped reflective film as claimed in claim 1, which is characterized in that: the ink has a viscosity of 12 to 35 mPa.s at a working temperature of 20 ℃ to 28 ℃.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019113714962 | 2019-12-27 | ||
| CN201911371496 | 2019-12-27 |
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| CN111320897A true CN111320897A (en) | 2020-06-23 |
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Citations (5)
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|---|---|---|---|---|
| CN1484680A (en) * | 2000-11-09 | 2004-03-24 | 3M创新有限公司 | Weather resisteant ink jettable radiation curable fluid compositions particularly suitable for outdoor applications |
| CN106366756A (en) * | 2016-10-20 | 2017-02-01 | 福建新力元反光材料有限公司 | Photo-curing printing ink composition |
| CN106536645A (en) * | 2014-07-15 | 2017-03-22 | 阪田油墨株式会社 | Clear ink composition for UV-LED curable inkjet printing |
| CN108912813A (en) * | 2018-06-22 | 2018-11-30 | 泉州市同兴反光材料有限公司 | A kind of preparation method of light-curable ink glue |
| KR20190032323A (en) * | 2019-03-18 | 2019-03-27 | 오현숙 | Ink coated with multi-layer of functional materials for nonreflect film |
-
2020
- 2020-04-16 CN CN202010303498.4A patent/CN111320897A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1484680A (en) * | 2000-11-09 | 2004-03-24 | 3M创新有限公司 | Weather resisteant ink jettable radiation curable fluid compositions particularly suitable for outdoor applications |
| CN106536645A (en) * | 2014-07-15 | 2017-03-22 | 阪田油墨株式会社 | Clear ink composition for UV-LED curable inkjet printing |
| CN106366756A (en) * | 2016-10-20 | 2017-02-01 | 福建新力元反光材料有限公司 | Photo-curing printing ink composition |
| CN108912813A (en) * | 2018-06-22 | 2018-11-30 | 泉州市同兴反光材料有限公司 | A kind of preparation method of light-curable ink glue |
| KR20190032323A (en) * | 2019-03-18 | 2019-03-27 | 오현숙 | Ink coated with multi-layer of functional materials for nonreflect film |
Non-Patent Citations (3)
| Title |
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| 唐正宁等: "《特种印刷技术》", 30 September 2007, 印刷工业出版社, pages: 159 * |
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