CN115960492B - Oily inkjet ink as well as preparation method and application thereof - Google Patents
Oily inkjet ink as well as preparation method and application thereof Download PDFInfo
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Abstract
The application relates to oily ink-jet ink, a preparation method and application thereof. The oily inkjet ink comprises pigment, a dispersing aid, a modified resin and a non-aqueous solvent, wherein the dispersing aid is a low-polarity high-molecular-weight dispersing aid containing pigment affinity groups, and the modified resin contains a six-membered ring structure. The oily ink-jet ink has good dispersion stability, storage stability and universality, can be used on various printing spray heads, and has better spray head moisturizing property and printing smoothness.
Description
Technical Field
The application relates to the field of ink, in particular to low-diffusivity oily drawing ink-jet ink for drawing of engineering drawings, and a preparation method and application thereof.
Background
The blueprint is printed by adopting a digital ink-jet technology, so that the printing quality of the spray head with high precision and high stability can be fully exerted, and the quality of the printed first blueprint and the first ten thousand blueprints are ensured to be unchanged. At present, water-based ink is mostly used for spray painting, but the printed patterns are not waterproof, light-proof, poor in migration resistance and poor in preservation property, and are not suitable for printing high-end documents such as engineering drawings. Compared with water-based ink, the oily ink has the characteristics of bright color, good water resistance and light resistance, high durability of the quality of the printed image and the like, and has a huge market in large-format and wide-format ink-jet printing.
The oily inks can be classified into solvent inks (solvent-based inks) in which a main solvent is a volatile organic solvent and oily inks (oil-based inks) in which a main solvent is a low-volatile or non-volatile organic solvent. The solvent ink is dried on the recording medium mainly by evaporation of the organic solvent, whereas the oily ink is dried mainly by permeation into the recording medium, and the oily ink is more environmentally friendly when printed. However, the oily ink in the related art is easy to spread laterally after being printed on paper, and affects the image definition. In addition, the oily ink often has the problems of insufficient printing smoothness, poor nozzle moisture retention, limitation of one formula of ink to be applied to a certain nozzle and the like when applied to an ink-jet printer.
Disclosure of Invention
In view of the shortcomings of the prior art, a first object of the present application is to provide an oily inkjet ink having low diffusivity, high image clarity, good dispersion stability, storage stability, better ink printing smoothness and nozzle moisturizing property.
The second object of the present application is to provide a preparation method of the above oil-based ink-jet ink, which has simple steps and high production efficiency.
The third object of the present application is to provide a printed matter obtained by ink-jet printing with the above oil-based ink-jet ink, which has a clear line and is excellent in water resistance and light resistance.
In order to achieve the first object, the present application provides an oil-based inkjet ink comprising a pigment, a dispersing aid, a modified resin and a nonaqueous solvent, wherein the dispersing aid is a low-polarity polymer containing a pigment affinity group, and the modified resin contains a six-membered ring structure.
In the scheme, the application provides the oily spraying ink containing pigment, the low-polarity high-molecular-weight dispersing auxiliary containing pigment affinity groups and the modified resin, which is the ink for oily drawing and is applicable to engineering drawing. The application uses the pigment affinity group-containing low-polarity high-molecular-weight dispersion auxiliary agent and the modified resin for the ink, thereby improving the dispersion stability and storage stability of the ink and improving the glossiness and image definition of the ink.
Specifically, the application adopts the low-polarity high-molecular-weight dispersing auxiliary containing pigment affinity groups, on one hand, the high-molecular polymer containing pigment affinity groups has good dispersion stabilization effect on pigment, can be more tightly combined with pigment, and makes a dispersion system more stable, thereby improving the dispersion stability and storage stability of pigment in the system, and meanwhile, the dispersing auxiliary deflocculates pigment through steric hindrance, and the deflocculated pigment particles are very small, so that high gloss can be obtained and color strength can be improved; on the other hand, the introduction of the low-polarity polymer dispersion auxiliary agent can improve the dispersibility of the ink, and meanwhile, the viscosity of the system is not increased, so that the ink permeability is strong.
Meanwhile, the modified resin containing the six-membered ring structure is introduced, so that on one hand, the transverse permeation of the ink on the paper can be weakened, the transverse diffusion of the ink can be restrained, and the image definition of the ink is improved; on the other hand, the modified resin containing the six-membered ring structure has lower polarity and better compatibility with the low-polarity high-molecular-weight polyester dispersion auxiliary agent, and in an oily ink system containing the pigment affinity group and the modified resin, the modified resin exists in a similar compatible holding mode, so that the pigment is quickly gathered in the process of applying the ink to a bearing medium and penetrating, gaps in a pigment layer formed on the bearing medium are reduced, and even if gaps are generated, the gaps are filled with the modified resin with the six-membered ring structure, so that the internal scattering of incident light on an image is reduced, the reflected light is not reduced, the glossiness of the image is improved, the sensitivity required in engineering is realized, and various thick and thin lines sprayed on a drawing can be clearly seen even under the condition of sunlight.
In some embodiments of the present application, the pigment affinic group is selected from at least one of amino, hydroxyl, nitro, carboxyl, cyano, alkenyl, alkynyl, mercapto; the low-polarity polymer is at least one selected from polyester and polyolefin.
In the above-mentioned embodiments, the polyester-based polymer is a polymer obtained by polycondensation of a polyhydric alcohol and a polybasic acid in a broad sense, and the polyolefin-based polymer may be a copolymer of at least one olefin such as polyethylene, polypropylene, poly-1-butene, poly-1-pentene, poly-1-hexene, poly-1-octene, poly-4-methyl-1-pentene, polybutadiene, polyisoprene, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, butadiene, isoprene, or the like. The low-polarity polymer is preferably a polyester high-molecular polymer or flexible polyolefin, the linear flexible macromolecular chain structure has no cross-linking among molecules, and can penetrate, overlap and entangle with modified resin containing a six-membered ring structure in the system under the impact of external force by means of intermolecular Fan Deli and/or hydrogen bond attraction entanglement, so that the system stability is improved. Pigment affinity groups in the molecular chains are compatible with the pigment, and can also form hydrogen bonds or other intermolecular forces with each other, so that high interactions are generated between the molecular chains, thereby stabilizing pigment particles.
In some embodiments of the application, the dispersing aid is selected from at least one of HP1024, HP1032, HP1058, HP1059, HP1362, HP1453, HP1476, HP1477, HP1478, HP1521, BYK-JET9142, BYK9131, BYK2200, BYK9151, KYC-919, KYC-918, KYC-970.
In the above scheme, the dispersing aid is selected from the above-mentioned dispersing aid grades, and the dispersing agent of the above grade is a low-polarity polymer containing pigment affinity groups. These dispersants are commercially available and readily available as raw materials.
In some embodiments of the present application, the modified resin is selected from at least one of petroleum resin, polyketone resin, hydrogenated rosin ester.
In the scheme, the modified resin can be petroleum resin containing six-membered carbocycle, polyketone resin and/or hydrogenated rosin ester, on one hand, the resin has good adhesion, wear resistance, weather resistance and water resistance, and is quick to dry and high in firmness, and the effect of adhesion, color loading, quick drying, brightening and the like can be achieved by adding the resin into an ink system; on the other hand, the resin has wide compatibility or good solubility with other components in an ink system, protects pigment from photo-oxidative degradation, can reduce the fading or color change of the ink, and improves the luster and usability of printed matters.
In some embodiments of the application, the non-aqueous solvent comprises at least one of a low or non-volatile fatty acid ester, a low or non-volatile oil.
In the above scheme, the non-aqueous solvent adopts the low-volatility or non-volatility oily solvent, on one hand, the non-aqueous solvent is a solvent carrier with high boiling point, low viscosity and low molecular weight, and for the permeation drying type ink, the rheological property of the ink system can be regulated just depending on the properties of the non-aqueous solvent, so that the permeation of the ink to the bearing medium can be successfully completed, and the fixation and drying of the ink on the bearing medium are accelerated. On the other hand, the non-aqueous solvent has extremely low volatility and even no volatilization, and has great guarantee on the aspects of health or safety of operators and environmental protection, so that the oily ink can be used in an indoor office environment.
In some embodiments of the application, the low or non-volatile fatty acid ester is at least one of diisononyl cyclohexane 1, 2-dicarboxylate, tributyl citrate, isopropyl palmitate, isooctyl palmitate, isononyl isononanoate, methyl soyate, isobutyl soyate.
In the scheme, the diisononyl cyclohexane 1, 2-diformate, tributyl citrate, isopropyl palmitate, isooctyl palmitate, isononyl isononanoate, soybean oil methyl ester and soybean oil isobutyl ester are selected as non-aqueous solvents, so that the ink system is more stable and reliable.
In some embodiments of the application, the low or non-volatile oil comprises at least one of a mineral oil, a silicone oil.
In the above scheme, the mineral oil may be refined mineral oil, and the mineral oil has strong permeability and can enable the ink to be dried quickly. The silicone oil may be a low molecular weight silicone oil that forms an insulating layer on the paper and does not continue to penetrate when the ink penetrates to some extent, resulting in pattern fading.
In some embodiments of the application, the mineral oil is a C20-C32 isoparaffin.
In the above scheme, the C20-C32 isoparaffin has good permeability.
In some embodiments of the application, the silicone oil is a linear alkyl polysiloxane.
In the above-described scheme, linear alkyl polysiloxanes such as dimethyl siloxane have good barrier properties.
In some embodiments of the application, the nonaqueous solvent contains a low or non-volatile fatty acid ester and a low or non-volatile oil.
In the above-described embodiments, the nonaqueous solvent contains both a low-volatility or nonvolatile fatty acid ester and a low-volatility or nonvolatile oil, and combines the stability of the ink and the permeability or barrier property.
In some embodiments of the application, the non-aqueous solvent contains a fatty acid ester, a mineral oil, and a silicone oil.
In the above-described embodiments, the fatty acid ester, the purified mineral oil, and the silicone oil are used as the nonaqueous solvent, so that other components in the ink can be well dissolved; the ink has certain penetrability, so that the printing stock can be dried quickly and cannot fade after being dried.
In some embodiments of the present application, the pigment comprises at least one of carbon black, an organic pigment.
In the scheme, the pigment has better dispersibility in a non-aqueous solvent, ensures excellent color performance and higher coloring strength of the ink, and has wider color spectrum.
In some embodiments of the present application, the organic pigment is selected from at least one of a disazo pigment, a pigment of the bisphenol AS system, and phthalocyanine blue.
In the above-described embodiments, the pigment may be selected from carbon black and organic pigments, and the amount thereof may be adjusted to give different colors, color densities, light resistance, and water resistance to the ink.
In some embodiments of the present application, the oily inkjet ink comprises 1% to 15% pigment, 2% to 10% dispersing aid, 2% to 15% modified resin, and the balance non-aqueous solvent.
In the scheme, the ink has good performance, the pigment is stably dispersed, the ink is in a stable moisturizing state, the ink viscosity can realize the adaptability of the ink to various spray heads, under the combination, the spray heads of the printer are started to print after being standby for 7 days, the ink can be continuously printed without blocking the spray heads, and the smoothness is good.
In some embodiments of the present application, the oily inkjet ink comprises 1% to 15% pigment, 2% to 10% dispersing aid, 2% to 15% modified resin, 10% to 30% low volatile or non-volatile fatty acid ester, and the balance low volatile or non-volatile oil. In some embodiments of the present application, the oily inkjet ink comprises 1% to 15% pigment, 2% to 10% dispersing aid, 2% to 15% modified resin, 10% to 30% low or non-volatile fatty acid ester, 3% to 15% silicone oil, and the balance mineral oil.
In the scheme, the ink has the best comprehensive performance and good printing effect.
In some embodiments of the present application, the oily inkjet ink has a viscosity of 8cps to 15cps at 25 ℃.
In the above-described embodiments, the viscosity of the oil-based inkjet ink is in the above-described range, and the oil-based inkjet ink can be applied to various types of heads, and has high versatility.
In some embodiments of the application, the surface tension of the oily inkjet ink is 20mN/m to 28mN/m.
In the above-described aspect, the surface tension of the oily inkjet ink is in the above-described range, enabling the inkjet printer to eject standard ink droplets.
In some embodiments of the application, the particle size D50 of the oily inkjet ink is less than or equal to 350 and D99 is less than 500.
In the scheme, the particle size of the particle dispersion in the ink is small, the spray head is not easy to block, and the gloss and the color strength can be improved.
In order to achieve the second object of the present application, the present application provides a method for preparing the above-mentioned oily inkjet ink, which comprises mixing a pigment, a dispersing aid and a first portion of non-aqueous solvent, adding a modified resin and the remaining second portion of non-aqueous solvent, and mixing to obtain the oily inkjet ink.
In the scheme, the pigment, the dispersing auxiliary and the first part of non-aqueous solvent are mixed firstly, and the modified resin and the rest of the second part of non-aqueous solvent are added firstly, so that the pigment is more uniformly dispersed, the preparation method has simple steps and high production efficiency.
In some embodiments of the application, the first portion of the non-aqueous solvent is mineral oil and the second portion of the non-aqueous solvent is a fatty acid ester and silicone oil.
In the scheme, the pigment and the dispersing aid are mixed with the mineral oil, and then the modified resin is mixed with the fatty acid ester and the silicone oil, so that the dispersing aid can better disperse the pigment.
In some embodiments of the present application, mixing the pigment, the dispersing aid, and the first portion of the non-aqueous solvent comprises milling the pigment, the dispersing aid, and the first portion of the non-aqueous solvent.
In the scheme, the pigment and the dispersing aid are dispersed more uniformly by grinding.
In some embodiments of the application, adding the modified resin and the remaining second portion of the non-aqueous solvent to remix comprises adding the modified resin and the remaining second portion of the non-aqueous solvent and stirring uniformly.
In the scheme, the oily inkjet ink can be obtained by dispersing the raw materials by stirring during secondary mixing.
In order to achieve the third object of the present application, there is provided a printed matter on which a printing surface is formed by inkjet printing, the printing surface being a printing surface obtained by inkjet printing an oily inkjet ink according to any one of the above aspects or an oily inkjet ink produced by any one of the above aspects.
In the above aspect, the present application provides a printed matter obtained by inkjet printing using the oily inkjet ink of the present application.
In some embodiments of the application, the printed surface is at least one of blue, white, yellow, brown.
In the scheme, proper ink color can be selected according to the printing requirement of an actual engineering drawing and matched with a printing carrier, so that a printing line with the required color is obtained.
Compared with the prior art, the application has the following beneficial effects:
(1) The oily ink-jet ink is low in viscosity, uniform in particle size distribution, adjustable in viscosity between 8.0cps and 15.0cps, and capable of controlling the surface tension to be 20-28 mN/m, and has good dispersion stability and storage stability, good matching with various nozzle printers and normal operation, and long-time storage, wherein the particle size D50 is less than or equal to 350 and the D99 is less than 500;
(2) The application develops the low-diffusivity oily drawing ink-jet ink, has low diffusivity and good diffusion inhibition, realizes high-quality drawing of the oily ink-jet ink on engineering drawings, improves the image quality of printed matters, avoids the phenomena of fading, ink gathering, ink melting, wrinkling, edge bleeding and the like of the ink on engineering paper, simultaneously, the obtained ink has the sensitivity required by engineering, and various thick and thin lines sprayed on the engineering drawings can be clearly visible under sunlight and can also be directly used for copying, and the obtained copied product and original are as good as one;
(3) The low-diffusivity oily drawing painting inkjet ink has wide universality, breaks through the limitation that one ink formula is matched with one printing nozzle, and the obtained oily inkjet ink has good jetting stability, standby property and nozzle moisture retention on printing nozzles of Toshiba, kenica, fine engineering and the like;
(4) The low-diffusivity oily ink has the performance meeting the requirements of drawing engineering drawings such as machinery, electronics, civil engineering, mining, geological survey and the like on various engineering drawings, and is particularly suitable for drawing various engineering drawings by an integrated stenograph and drawing various precise engineering drawings.
Detailed Description
The application provides low-diffusivity oily drawing ink-jet ink, a preparation method and application thereof, and aims to make the purposes, technical schemes and effects of the application clearer and more definite. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In some embodiments of the present application, the present application provides an oil-based inkjet ink having a low diffusivity, which is suitable for oil-based drawing and painting, based on a pigment, a dispersion aid, a modified resin, and a nonaqueous solvent.
In some embodiments of the present application, the oily inkjet ink comprises, by weight, 1% to 15% pigment, 2% to 10% dispersion aid, 2% to 15% modified resin, and the balance being non-aqueous solvent. In some embodiments of the present application, the oily inkjet ink comprises, by weight, 1% to 15% pigment, 2% to 10% dispersion aid, 2% to 15% modified resin, 10% to 30% fatty acid ester, 3% to 15% modified silicone oil, and balance refined mineral oil. Wherein the weight percent of pigment may be, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%; the weight percentage of dispersing auxiliary may be, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%; the weight percentage of the modified resin may be, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%; the weight percentage of fatty acid esters may be, for example, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29% or 30%; the weight percentage of the modified silicone oil may be, for example, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%.
In some embodiments of the present application, the pigment is one or more of a disazo pigment, a pigment of the phenol AS system, a phthalocyanine blue, and a carbon black, and the pigment can be flexibly selected according to the color of the inkjet ink. The source of the pigment is not particularly limited, and may be any one of those obtained by a preparation method well known to those skilled in the art or commercially available products.
In some examples of the application, the dispersing aid is a low polarity high molecular weight polyester-based polymer, and in some embodiments, examples thereof include HP1024, HP1032, HP1058, HP1059, HP1362, HP1453, HP1476, HP1477, HP1478, HP1521, BYK-JET9142, BYK9131, BYK2200, BYK9151, and KYC-919, KYC-918, KYC-970, respectively, of Anhui New chemical Co., ltd.
In some embodiments of the present application, the modified resin is selected from one or more of petroleum resin, polyketone resin, hydrogenated rosin ester, in some embodiments, the petroleum resin is a C9 petroleum resin, and the source of the C9 petroleum resin is not particularly limited, and may be prepared by a preparation method well known to those skilled in the art or a commercially available product; examples of the polyketone resin include CT-A81 of Jinan Changtai chemical Co., ltd, BK-515 of Anqing iridic chemical Co., ltd; examples of the hydrogenated rosin ester include perhydrogenated rosin and hydrogenated water-white rosin, and specifically KE311, KE604, KR610 of KR's, japan, and Foral AX-E of Ikmann, USA.
In some embodiments of the present application, the fatty acid ester is one or more of cyclohexane 1, 2-dicarboxylic acid diisononyl ester, tributyl citrate, isopropyl palmitate, isooctyl palmitate, isononyl isononanoate, methyl soyate, isobutyl soyate, and the source of the fatty acid ester is not particularly limited, and the fatty acid ester may be prepared by a preparation method well known to those skilled in the art or may be a commercially available product.
In some embodiments of the present application, the refined mineral oil is a C20-C32 isoparaffin, and the source of the refined mineral oil is not particularly limited, either by preparation methods well known to those skilled in the art or by commercial products.
In some embodiments of the present application, the modified silicone oil is a linear low molecular weight silyl compound, and as the modified silicone oil, a silicone oil obtained by introducing various organic groups onto a silicon atom of a part of chain-like dimethylsilicone oil may be used. As the modified silicone oil, it is preferable that all silicon atoms are bonded to only any one of carbon atoms and oxygen atoms of siloxane bonds. The modified silicone oil preferably has a constituent atom composed of only silicon atom, carbon atom, oxygen atom and hydrogen atom. The modified silicone oil may be, for example, simethicone, and the source of simethicone is not particularly limited, and may be any commercially available product or may be produced by a production method known to those skilled in the art.
The following will further illustrate the technical scheme of the present application by combining examples and comparative examples. Examples 1 to 5 and comparative examples 1 to 5 of the low-diffusivity oily drawing inkjet inks of the present application were formulated with the raw material compositions shown in table 1. In the following examples and comparative examples, the contents are mass percentages unless otherwise specified.
Table 1 raw material composition of examples and comparative examples
Examples 1 to 5 differ from comparative examples 1 to 5 in that: in the preparation of the oily inks of comparative examples 1 to 5, the dispersing aid was not contained in comparative example 1, the dispersing aids of comparative examples 2 and 3 were replaced with the dispersing aid commonly used for oily inkjet inks, the modified polyurethane polymer EFCA 4010 of BASF was used in comparative example 2, the modified polyacrylate PA 4550 of BASF was used in comparative example 3, the modified resin having a six-membered ring structure was not added in comparative example 4, and the polyurethane resin commonly used for oily inks (HP 1308 of Anshanhui iridescent New Material chemical Co., ltd.) was replaced with the modified resin having a six-membered ring structure in comparative example 5.
The same pigments as those used in examples 1 to 5 and comparative examples 1 to 5 were used, and the change in the pigment type did not greatly affect the properties and parameters of the inks such as viscosity, surface tension, particle size, etc. Different colors of ink can be obtained by changing the pigment type.
The above-described oily inkjet inks of examples 1 to 5 were prepared in substantially the same manner as those of comparative examples 1 to 5, and each of them included the following steps: and (3) proportionally adding the pigment and the dispersing aid into mineral oil, grinding, proportionally adding the modified resin, the fatty acid ester and the modified silicone oil, and uniformly stirring to obtain the oily inkjet ink. When the comparative example does not contain the corresponding component, the corresponding component is omitted in the above step.
Test example 1
The oil-based inkjet inks prepared in examples 1 to 5 and comparative examples 1 to 5 were tested for particle size, viscosity and surface tension, respectively, at 25 ℃ and aged for 7 days at 60 ℃. The test results are shown in Table 2 below, the viscosity at 25℃of the oily inkjet inks of examples 1 to 5 is 8.0 to 15.0cps, and the surface tension is 20.0 to 28.0mN/m; the ink has small grain diameter change before and after aging for 7 days at 60 ℃ and good ink stability; the product is placed for 1 year at normal temperature, and does not generate layering, precipitation, flocculation and other phenomena.
Table 2 particle size, viscosity and surface tension of examples and comparative examples aged for 7 days at 25 ℃ and 60 °c
Test example 2
The oily inkjet inks prepared in examples 1 to 5 and comparative examples 1 to 5 were filtered with 1.0 μm glass fiber film plus definite filter paper and then subjected to printing tests on an integrated stenograph equipped with a toshiba jet.
1) Installation performance test
4 ink cartridges are filled with ink (i.e. the test is repeated four times), the nozzle is directly checked after the filling to check whether the line breakage condition exists, 0 to 1 time of line breakage is qualified in the 4 times of test, and 2 to 4 times of line breakage is unqualified.
2) Printing fluency testing
1000mL of ink is poured into an integrated stenograph with a Kernicke spray head, at least 1000 pages of 100% full-width monochromatic blocks are continuously printed on an A4 paper medium, the printing state of the ink is observed, and the number of ink broken holes is recorded. Judgment standard: A. the printing is smooth, 1000 pages are continuously printed, no broken holes or ink breaks exist, the performance is good, and the actual use can be completely met; B. the hole breakage occurs in the printing process, the cleaning can be recovered to be normal once, the condition that more than 1000 pages are continuously printed is not more than twice, and the actual use can be barely satisfied; C. serious hole breakage and ink breakage occur in the printing process, and actual use is not satisfied.
3) Standby performance test
After the printing test is finished, the printing is continued after the ink-jet standby is closed for 24 hours under the conditions that the ambient temperature is 18-30 ℃ and the humidity is 50-80%, and the mesh state is tested. And (3) judging: the hole Kong is good when the hole is broken for 24 hours, and the hole is broken for 24 hours and is more than 2 holes when the hole is poor.
The test results are shown in Table 3.
Table 3 examples and comparative examples print test results
Test example 3
After the oily inkjet inks prepared in examples 1 to 5 and comparative examples 1 to 5 were filtered with 1.0 μm glass fiber film plus definite filter paper, nozzle adaptability tests were performed with plain A4 paper on onepass printers equipped with toshiba nozzle, konica 1024i nozzle, and fine 1020 nozzle, respectively: the loading performance test, the printing fluency test, and the standby performance test in the application example 2 of the present application were performed on each head, respectively.
Judgment standard: meanwhile, when the installed performance is qualified, the printing fluency test A or B grade and the standby performance test are good, the nozzle adaptability is OK, otherwise NG.
Table 4 examples and comparative examples spray head suitability test
| Toshiba spray head | Kenica 1024i nozzle | Fine 1020 spray head | |
| Example 1 | OK | OK | OK |
| Example 2 | OK | OK | OK |
| Example 3 | OK | OK | OK |
| Example 4 | OK | OK | OK |
| Example 5 | OK | OK | OK |
| Comparative example 1 | NG | NG | NG |
| Comparative example 2 | NG | NG | NG |
| Comparative example 3 | NG | NG | NG |
| Comparative example 4 | NG | NG | NG |
| Comparative example 5 | NG | NG | NG |
Test example 4
The oily inkjet inks prepared in examples 1 to 5 and comparative examples 1 to 5 of the present application were filtered with 1.0 μm glass fiber film plus definite filter paper and then printed on carrier media such as blueprint, A4 and cartons on an onepass machine equipped with a konica 1024i nozzle. The resultant printed matter was tested for its relevant service properties.
(1) Color density: in the color rendering of printed matter, it is an important parameter that has a certain impact on the color rendering. The CMYK four color patches were printed with a color inkjet printer and measured with an X-Rite reflectance densitometer. The greater the field density, the brighter the surface color of the printed matter, and the more vivid and lifelike the printed matter.
(2) Dot diffusion: ink dot roundness was used for characterization. The calculation formula of the roundness of the ink points is as follows: (wherein: A is the dot area; P is the dot circumference), roundness (RD) =4pi A/P 2 . The closer the value is to 1, the better the imaging of the ink dots, which indicates that the paper pattern has no phenomena of diffusion, permeation and the like. When the roundness value of the ink points is smaller than 1, the imaging of the ink points is incomplete; when the dot circularity value is greater than 1, the dots are considered to be diffused to different extents.
The roundness of the CMYK four-color ink dots is printed, and the diameter is 1mm. Ink dot circularity is then measured and calculated using image analysis software.
(3) Line diffusion: printing CMYK four-color lines with the width of 0.5mm, taking 1.5 times amplified pictures by using a photomicrograph shooting instrument according to a scale, measuring line width and finally taking an average value. The line diffusivity was recorded by the percentage of line diffusivity, with the resulting values less than 3% rated a, 3% to 5% rated B, and greater than 5% rated C. Wherein the percentage of line diffusion = [ (measured value-0.5)/0.5 ]. Times.100%
(4) Water resistance: the prints of examples 1 to 5 and comparative examples 1 to 5 were taken, placed in deionized water for 30 minutes, taken out, and naturally dried at room temperature to be used as an experimental group, and the prints not soaked in deionized water were taken as a control group. Then, the color properties are measured by a spectrometer, and the color difference value (delta E) before and after the draft is soaked in water is compared. The smaller the Δe value obtained after the water resistance test, the smaller the degree of fading of the ink, and the better the water resistance of the ink.
(6) Light resistance: the inks of examples 1 to 5 and comparative examples 1 to 5 were printed on blueprints to form full-red prints, and after the color properties of the initially printed full-red prints were tested, the full-red prints were subjected to an illumination test using a simple illumination apparatus of Microsol, which was 16 hours, which corresponds to a usual sun exposure time of three half months (10 hours of day of sunlight). After 16 hours, color properties were measured with a spectrometer and color difference values (Δe) before and after irradiation were compared. The smaller the Δe value obtained after the irradiation test, the smaller the degree of fading of the ink, and the better the light resistance of the ink.
TABLE 5 relevant service Properties of printed matter of examples and comparative examples
| Color density | Ink dot circularity | Percentage of line diffusion | Water resistance | Light resistance | |
| Example 1 | 2.35 | 1.01 | A | 1.7 | 31 |
| Example 2 | 2.10 | 1.02 | A | 1.5 | 27 |
| Example 3 | 2.03 | 0.99 | A | 2.1 | 35 |
| Example 4 | 2.05 | 1.01 | A | 2.1 | 24 |
| Example 5 | 2.04 | 0.98 | A | 1.5 | 33 |
| Comparative example 1 | 2.36 | 1.07 | B | － | － |
| Comparative example 2 | 2.34 | 0.91 | B | － | － |
| Comparative example 3 | 2.35 | 1.04 | A | － | － |
| Comparative example 4 | 2.33 | 1.98 | C | － | － |
| Comparative example 5 | 2.34 | 1.24 | C | － | － |
Note that: in the table "-" is the test item not made.
From the above, it can be seen that the inks of examples 1 to 5 of the present application have a more stable dispersion effect and a better printing effect, head adaptability and practicality than those of comparative examples 1 to 5 by adding the dispersion aid and the modified resin to the inks of examples 1 to 5 of the present application.
Finally, it should be emphasized that the above description is merely of a preferred embodiment of the application, and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (15)
1. An oily inkjet ink is characterized by comprising a pigment, a dispersing aid, a modified resin and a non-aqueous solvent, wherein the dispersing aid is a low-polarity polymer containing a pigment affinity group, and the pigment affinity group is at least one of amino, hydroxyl, nitro, carboxyl, cyano, alkenyl, alkynyl and mercapto; the low-polarity polymer is at least one selected from polyester and polyolefin;
the modified resin is at least one selected from petroleum resin, polyketone resin and hydrogenated rosin ester;
the oily inkjet ink comprises, in weight percent, 1% to 15% of the pigment, 2% to 10% of the dispersing aid, 2% to 15% of the modified resin, and the balance of the nonaqueous solvent; the nonaqueous solvent contains a low-volatility or nonvolatile fatty acid ester and a low-volatility or nonvolatile oil;
the oily inkjet ink has a viscosity of 8cps to 15cps at 25 ℃; the particle size D50 of the oily inkjet ink is less than or equal to 350nm, and D99 is less than 500nm.
2. An oil-based ink-jet ink as claimed in claim 1, wherein the low-volatility or non-volatility fatty acid ester is at least one of cyclohexane 1, 2-dicarboxylic acid diisononyl ester, tributyl citrate, isopropyl palmitate, isooctyl palmitate, isononyl isononanoate, methyl soyate, isobutyl soyate.
3. An oily inkjet ink according to claim 1 characterised in that the low or non-volatile oil comprises at least one of mineral oil, silicone oil; the mineral oil is a C20-C32 isoparaffin; the silicone oil is a linear alkyl polysiloxane.
4. An oily inkjet ink according to claim 1 wherein the non-aqueous solvent contains a fatty acid ester, a refined mineral oil and a silicone oil.
5. An oil-based ink-jet ink as claimed in any one of claims 1 to 4, characterized in that said pigment comprises at least one of carbon black, organic pigments.
6. An oil-based ink-jet ink according to claim 5, wherein the organic pigment is at least one selected from the group consisting of disazo pigments, pigment of the phenol AS system, and phthalocyanine blue.
7. An oily inkjet ink according to any one of claims 1 to 4, wherein the oily inkjet ink comprises, in weight percent, 1% to 15% of the pigment, 2% to 10% of the dispersing aid, 2% to 15% of the modifying resin, 10% to 30% of a low-volatility or non-volatility fatty acid ester and the balance of a low-volatility or non-volatility oil.
8. An oil-based ink-jet ink as claimed in any one of claims 1 to 4, wherein said oil-based ink-jet ink comprises 1 to 15% of said pigment, 2 to 10% of said dispersing aid, 2 to 15% of said modified resin, 10 to 30% of a low-or non-volatile fatty acid ester, 3 to 15% of silicone oil and the balance of mineral oil.
9. An oily inkjet ink according to any one of claims 1 to 4 characterised in that the oily inkjet ink has a surface tension of from 20mN/m to 28mN/m.
10. The method for producing an oily inkjet ink according to any one of claims 1 to 9, characterized by comprising mixing the pigment, the dispersion aid and a first part of the nonaqueous solvent, adding the modified resin and the remaining second part of the nonaqueous solvent, and then mixing to obtain the oily inkjet ink.
11. The method according to claim 10, wherein the first part of the nonaqueous solvent is mineral oil, and the second part of the nonaqueous solvent is fatty acid ester and silicone oil.
12. The method of preparing according to claim 10, wherein mixing the pigment, the dispersing aid, and the first portion of the non-aqueous solvent comprises grinding and dispersing the pigment, the dispersing aid, and the first portion of the non-aqueous solvent.
13. The method of preparing according to claim 10, wherein adding the modified resin and the remaining second portion of the non-aqueous solvent to be mixed again comprises adding the modified resin and the remaining second portion of the non-aqueous solvent to be stirred uniformly.
14. A printed matter on which a printed surface is formed by inkjet printing, characterized in that the printed surface is a printed surface obtained by inkjet printing an oily inkjet ink according to any one of claims 1 to 9 or an oily inkjet ink produced by the production method according to any one of claims 10 to 13.
15. The article of claim 14, wherein the print surface is at least one of blue, white, yellow, and brown.
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