CN111196902A - Preparation method of high-covering black UV (ultraviolet) screen printing ink - Google Patents
Preparation method of high-covering black UV (ultraviolet) screen printing ink Download PDFInfo
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Abstract
The invention discloses a preparation method of high-covering black UV screen printing ink, which comprises the following steps of preheating acrylate, and mixing the preheated acrylate with part of active monomers; adding a dispersing agent, and dispersing for the first time; then adding the pigment and the filler in sequence, and dispersing for the second time; grinding to obtain color paste; mixing a phosphine oxide photoinitiator with the remaining reactive monomer; and then adding the color paste, the organic silicon defoaming agent and the organic silicon leveling agent, and dispersing uniformly to obtain the high-coverage black UV screen printing ink. The high-covering black UV screen printing ink disclosed by the invention is reasonable in composition, good in component coordination, excellent in system comprehensive performance, suitable for screen printing and good in storage property, and the viscosity of the high-covering black UV screen printing ink is high. The system does not need to increase the use amount of components such as carbon black and the like, thereby avoiding the adverse effects on the appearance and the light-shading property of the product; and the product shading requirement can be met only by one-time printing under the thickness of 7-8 microns, and an unexpected technical effect is achieved.
Description
The invention discloses split application with the name of high-covering black UV screen printing ink, the application date of which is 2015, 5 and 26 and the application number of which is 201510275592.2, and belongs to the technical part of product preparation.
Technical Field
The invention relates to the technical field of printing ink, in particular to high-covering-capacity black UV silk-screen printing ink which can be used for printing a computer keyboard.
Background
The UV curing is ultraviolet curing, the UV is the English abbreviation of ultraviolet, the curing refers to the process of converting substances from low molecules into high molecules, the photoinitiator in a liquid UV material is stimulated to be changed into free radicals or cations under the radiation of UV medium and short waves of the UV ultraviolet, so that the process of initiating the polymerization of the high molecular material (resin) containing active functional groups into an insoluble and infusible solid coating film is initiated, the UV curing is a new technology which is created in the 60 th of the 20 th century, is environment-friendly and has low VOC emission, and the UV curing is rapidly developed in China after the 80 th of the 20 th century. UV curing generally refers to the curing conditions or requirements of coatings (paints), inks, adhesives (glues), or other potting sealants that require curing with ultraviolet light, as distinguished from thermal curing, curing with crosslinking agents (curing agents), natural curing, and the like.
Generally, the ultraviolet light refers to invisible light with a wavelength in the range of 0-400nm, and the ultraviolet wavelength used for UV curing is 200-400 nm. The curing of the UV screen printing ink mainly depends on two aspects of a photoinitiator and a curing process, and the crosslinking reaction speed of the resin and the compatibility of the pigment and the filler play an important role to a certain extent. The curing methods used today are mostly medium-pressure mercury arc lamps excited by electricity, and the energy is 400-2As the initiator, benzoin and derivatives thereof, benzil and derivatives thereof, acetophenone and derivatives thereof, and acylphosphine oxide compounds are used in many cases.
The UV silk-screen printing ink has the advantages of energy conservation, environmental protection, high efficiency and the like, and is widely applied to printing of electronic devices and packaging materials. In the field of computer keyboard printing, UV type ink has gradually or partially replaced solvent type ink, and is a hot point of research. In the electronic field, computer keyboards and tablet computers require shading, and the shading sheet is formed by arranging a lightproof ink layer on a transparent or white substrate to block an LED light supplement source, so that the ink is required to have high covering property. The existing UV ink has the defect of insufficient covering power, 250-mesh screen printing is performed, the film thickness is 7-8 mu, the covering power of a paint film is insufficient, covering is difficult to form during printing, and the light transmission is serious.
The existing solvent-based ink needs two printing steps, the thickness of the printing film is generally more than 10 microns to shield LED light, and the defects mainly include that the ① process is complex, two steps of silk screen printing are needed, the curing is time-consuming, the baking is needed for more than 2 hours, the efficiency is low, the ② solvent-based ink VOC volatilizes, the environmental pollution and the human injury are easily caused, and the ink belongs to non-environment-friendly ink.
In the prior art, the method for improving the UV black ink covering power is to increase the proportion of carbon black in the formula, but once the using amount exceeds the critical volume concentration (CPVC), the resin can not completely coat the toner, and the phenomena of pinholes, sand holes and light transmission and the like are easy to generate; and the existing ink has dumb gloss (the gloss range is 3-6GS), a certain amount of matting powder needs to be added, but the matting powder is transparent, so that the covering power of the coating is reduced. Due to the difficulty in improving the hiding power, the shading requirement must be satisfied by increasing the film thickness during printing.
Most importantly, the existing UV ink is difficult to cure by ultraviolet drying. The powder amount is increased, the covering power of a paint film is improved, after the paint film is cured by a UV machine, the paint film can only reach surface drying and deep curing is difficult, so that the surface of the paint film is shrunk, cracks and orange peel are generated, the deep layer of the paint film is not cured, the overall physical properties of the coating are influenced, particularly, the adhesive force with a base material is poor, and the heat shock resistance, the weather resistance and the mechanical properties are not suitable for the requirements of a computer keyboard.
The current industry faces the difficult problem that UV black silk-screen printing ink is difficult to cure due to the fact that the covering power is improved, so that UV system printing ink is still limited, compared with solvent type printing ink, the UV type printing ink is difficult to popularize and use due to the short plate, and solvent type printing ink which is not environment-friendly still occupies most market share.
Therefore, it is necessary to develop a new means to effectively improve the hiding power of the UV ink, and as an ink system, in addition to having high hiding power, it is also necessary to have good compatibility with a substrate, good adhesion, good curing degree, and little environmental pollution.
Disclosure of Invention
The invention aims to provide the high-covering black UV screen printing ink which combines the technology of inorganic materials and high polymer materials, has unique design, reasonable composition, convenient preparation, excellent high covering performance, good compatibility with a base material, high curing degree and small environmental pollution; the shading effect can be achieved only by one-step printing, the process is simple, and the production efficiency is high; the film thickness is lower, and the product is scrapped less, does benefit to reduce cost.
In order to achieve the purpose, the invention adopts the technical scheme that: the high-covering black UV screen printing ink comprises the following components in parts by weight:
the acrylate is one or more of aliphatic polyurethane acrylate, polyester acrylate and epoxy acrylate;
the pigment consists of carbon black with the particle size of 25-30 microns and carbon black with the particle size of 15-20 microns.
The phosphine oxide photoinitiator is an oxide of phosphine, can be selected from 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide (TPO), bis (2,4, 6-trimethylbenzoyl) -phenyl phosphine oxide (photoinitiator 819) and the like, is matched with a UV spectrum, is not influenced by pigment light absorption, can exert a photoinitiation effect to the maximum extent, can fully absorb a light source to generate a free radical crosslinking reaction, and can be completely cured to ensure the performance of a film layer; in order to obtain better curing effect, two photoinitiators are usually selected and used in a blending manner, and the addition amount is 7-15%.
The resin is the main embodiment of the ink performance, not only exerts the basic performances of self adhesion, thermal shock resistance, weather resistance and the like, but also mainly coordinates the compatibility of all components in the ink, so that the interface effect is exerted among the components to achieve the synergistic effect, and the defect of overall performance reduction caused by the incompatibility of a certain component is avoided. The resin system has multiple functionality (double bond groups) and reasonable composition, and the aliphatic polyurethane acrylate (PUA) is used as main resin, has excellent wear resistance and flexibility, and simultaneously has good hardness and chemical resistance, so that the ink is endowed with performances of wear resistance, alcohol resistance and the like; the Epoxy Acrylate (EA) has fast curing reaction, is beneficial to improving the curing performance of the printing ink and has adhesive force to a PC substrate; the polyester acrylate (PEA) has good wettability and weather resistance, can be used in combination with polyurethane acrylate and epoxy acrylate, can adjust the viscosity of a system, provides excellent coating performance, and is beneficial to improving the processability of the ink.
In the invention, preferably, the acrylate is one or more of hexa-functionality aliphatic polyurethane acrylate, difunctional polyester acrylate and difunctional epoxy acrylate; preferably a mixture of the three; more preferably, the ratio of the aliphatic urethane acrylate, the polyester acrylate and the epoxy acrylate is 4:2: 0.5.
According to the invention, the active monomer can adjust the viscosity of the system, so that the components are uniformly dispersed, the interface effect among the components is increased, and the cooperativity of the system is improved, thereby obtaining the high-coverage UV ink with excellent comprehensive performance; and the reactive monomer also provides a functional group that, when cured, undergoes a crosslinking reaction with the segment of the resin. The active monomer can be selected from different functionalities, the monofunctional monomer such as vinyl pyrrolidone can provide excellent adhesive force for the ink, the trifunctional monomer such as trimethylolpropane triacrylate (TMPTA) has high crosslinking density, the wear resistance of a paint film is improved, and 1, 6-hexanediol diacrylate (HDDA) has a diluting effect.
The hiding power of the ink depends primarily on the choice of pigment. Hiding power is the result of the scattering and absorption of light by the pigment. The inventive mixed carbon black with larger grain diameter (25-30 μm) and carbon black with smaller grain diameter (less than 20 μm) are used as pigment components, the mass ratio of the carbon black to the carbon black is 2-3:1, and the inventive mixed carbon black is favorable for curing a system while ensuring the covering power of the material; the filler comprises inorganic compounds such as calcium carbonate, barium sulfate and the like, has good compatibility with organic components, does not weaken the comprehensive performance of the paint film, can refract light on the surface, and can ensure that a light source can penetrate into the paint film instead of reflection due to refraction of the filler, thereby playing a role in promoting curing. In addition, the inorganic filler can also play a role in blocking oxygen and inhibiting polymerization, and can promote the curing of the UV printing ink.
In the technical scheme, the dispersant is an amino dispersant; the defoaming agent is dimethyl polysiloxane; the leveling agent is polysiloxane polyether copolymer. In the preparation of the ink, the surface defect caused by vapor bubbles is avoided, and the leveling of the ink on the surface of the substrate is facilitated.
The ink can generate physical and chemical changes in the process of construction and film forming, and the changes and the properties of the ink can obviously influence the construction and application performance of the ink. After the ink is printed, a new interface appears, and if the interfacial tension of a liquid/solid interface between the ink and a substrate is higher than the critical surface tension of the substrate, the ink cannot spread on the substrate, and the defects of fish eyes, shrinkage cavities and the like are generated naturally. The formation of shrinkage cavities results in insufficient ink layer thickness and the formation of pinholes which can cause discontinuity of the ink layer, which can reduce the adhesion of the ink to the substrate and greatly reduce the adhesion and hiding power of the whole system. This is also the reason why the application of the existing mask type UV ink is limited.
The invention creatively designs a new high-covering UV ink system, the compatibility between the resin and the additive, particularly the pigment and the filler is good, the appearance and interface defects generated when the ink flows and is solidified are avoided, and the adhesive force of the ink/the substrate is effectively improved; the ink system has good stability, is not easy to deteriorate, has small viscosity change after storage, and has no influence on performance; the reactivity is good during curing, the coating performance on a base material is good, and the smoothness is high; the cured product is resistant to solvent erosion, has good weather resistance, and does not change color or yellow for a long time; the cured ink layer has excellent covering power, and the OD reaches 4; no adverse phenomena such as orange peel and pinholes. Good curing effect, alcohol resistance (more than or equal to 1000 times of 500gf and 99.5 percent of ethanol), abrasion resistance (512 rubber, more than or equal to 300 times of 500gf) and high adhesive force (3M adhesive tape, 5B). The UV ink solves the problems of poor weather resistance, easy yellowing, brittleness and weak bonding force caused by weak hiding power and low curing degree of the existing UV ink.
In addition, in order to improve the interface effect between the ink and the substrate and reduce the defects as much as possible, the prior art pretreats the substrate before printing the ink; according to the invention, the base material is directly printed on the newly designed ink without pretreatment, the cured ink layer is well bonded with the base material, no interface defect exists, the beautiful appearance of the product is ensured, and the covering power of the base material is effectively improved.
Preferably, the high-covering black UV screen printing ink consists of the following components in parts by weight:
the preparation method of the high-covering black UV screen printing ink comprises the following steps:
(1) preheating acrylic ester and mixing with partial active monomer; adding a dispersing agent, and dispersing for the first time; then adding the pigment and the filler in sequence, and dispersing for the second time; grinding to obtain color paste;
(2) mixing a phosphine oxide photoinitiator with the remaining reactive monomer; and (2) adding the color paste obtained in the step (1), an organic silicon defoaming agent and an organic silicon leveling agent, and dispersing uniformly to obtain the high-coverage black UV screen printing ink.
In the technical scheme, the acrylic ester preheating in the step (1) is preheating for 24 hours at 50 ℃.
In the technical scheme, the first dispersion rotating speed in the step (1) is 800-; the second dispersion rotation speed is 1000-1200 r/min, and the time is 20-25 min.
In the above technical scheme, when the step (2) is dispersed, the rotation speed is 800-.
In the invention, the dispersing agent is a high molecular weight block copolymer solution containing pigment affinity groups, which is beneficial to the dispersion of solid particles and can prevent the sedimentation and agglomeration of the solid particles; the carbon black and the filler are used as the toner without halogen, and the toner not only has the color development effect, but also enables the ink to have good covering power on a base material, and simultaneously enables the performances of the ink, such as solvent resistance, heat resistance and the like, to be improved; the defoaming agent is dimethyl polysiloxane, and the function of the defoaming agent is to reduce bubbles generated in the manufacturing and using processes; the leveling agent is polysiloxane polyether copolymer, and the function of the leveling agent is to promote the leveling of the surface of the coating and form a smooth surface.
The additive and the powder are low in dosage, and are beneficial to wetting and coating the filler by the resin, so that the light transmission phenomena of pinholes and sand holes are avoided; the fluidity of the printing ink is ensured, the wetting capacity of the printing ink base material is improved, and the light leakage phenomenon is avoided. With the cooperation of other components, can effectively improve the hiding power on printing ink layer, only need 7 microns, can cover LED light. The unexpected technical effect is achieved.
According to the invention, the active monomer and the UV resin are mixed, and the carbon black is added for dispersion in a dispersion state, so that the resin coats and soaks the carbon black under the action of the active monomer reducing the viscosity of the UV resin, the compatibility of the carbon black and other organic systems such as the resin is increased, and the defects of an ink layer such as pinholes are avoided.
The high-coverage black UV screen printing ink can be cured to form a high-coverage UV resin film, and the specific preparation method is that the high-coverage black UV screen printing ink is printed on the surface of a base material through a screen printing process; and then, a UV cold light source is adopted, and the irradiation time is 25-35 seconds, so that the high-covering UV resin film is obtained, and the film thickness is 7-8 microns. The high-covering UV resin film has full and bright color, high covering power, OD (optical density) value of 4, and no adverse phenomena such as orange peel and pinholes; good curing effect, alcohol resistance (more than or equal to 1000 times of 500gf and 99.5 percent of ethanol), abrasion resistance (512 rubber, more than or equal to 300 times of 500gf) and high adhesive force (3M adhesive tape, 5B).
In the technical scheme, during the screen printing process, the mesh number of the screen printing plate is 250 meshes, the tension is 21 +/-1N, and the angle is 22.5 degrees.
In the technical scheme, the base material is PC or ABS.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the high-covering black UV screen printing ink disclosed by the invention is unique in design, reasonable in composition, convenient to prepare, excellent in high covering performance and good in adhesive force with a base material, and ensures the adhesiveness and the processability of the ink while improving the shading and heat resistance performances of the ink, mainly improves the curing degree of the ink; the defect that the curability of an ink layer is damaged in order to improve the covering by the conventional means is avoided, and meanwhile, the environmental pollution is small.
2. The high-covering UV resin film disclosed by the invention utilizes cold light source radiation, avoids the adverse effect of the irradiation of the existing mercury lamp on the performances of a paint film and a base material, and overcomes the defects that the existing UV radiation is large in UV output power fluctuation caused by unstable voltage and affects the performance of the paint film.
3. The high-covering black UV screen printing ink disclosed by the invention still obtains excellent light shading property without excessively increasing the amount of carbon black, obtains a better curing effect and overcomes the problem of non-curing caused by the increase of the amount of the carbon black. The defects of film layers such as pinholes, sand holes and the like in the existing product are avoided. And the ink layer is thin, the thickness of the ink layer is 7 micrometers, so that the LED light supplement source can be blocked, the existing paint film can not effectively shade light even if the thickness of the paint film exceeds 8 micrometers, and unexpected technical effects are achieved.
4. When the high-covering black UV screen printing ink provided by the invention is used, plastic materials do not need to be pretreated, and the shading effect can be achieved only by one-time printing, so that the defect that the existing solvent type ink needs to be printed at least twice is overcome, the cost is greatly saved, and the pollution to the environment can be further reduced.
5. The high-covering black UV screen printing ink provided by the invention has good compatibility of each component, and good wetting property of organic matters on inorganic materials, so that the defect of overall performance reduction of a paint film caused by non-synergy of a certain component is avoided; meanwhile, under the action of a photoinitiator and pigment and filler, ultraviolet rays can penetrate deep into the ink, the activity of the photoinitiator can be stimulated to the maximum extent, and the cross-linking curing effect of the resin body is ensured, so that the high-covering UV resin film with excellent comprehensive performances such as covering power, adhesive force, friction resistance, solvent resistance, weather resistance and the like is obtained.
6. The high-covering black UV screen printing ink provided by the invention is convenient to use and store, and only needs one-time printing on the premise of achieving the same shading property, so that the consumption is low, the pollution to the environment is less, and the harm to human bodies is lower; and because the additive dosage is low, the wetting property in a resin system is good, the product appearance is favorably improved, and the method is more suitable for industrial production.
Drawings
FIG. 1 is a graph showing adhesion test results of a product of one embodiment and a conventional product after curing;
FIG. 2 is a graph showing the results of the abrasion resistance test of the second product of example II;
FIG. 3 is a graph showing the effect of the alcohol resistance test on the third product of the example.
Detailed Description
The invention is further described with reference to the following figures and examples:
example one
According to the weight portion, 68 portions of acrylate are formed by mixing aliphatic polyurethane acrylate (double bond chemical engineering, 5290), polyester acrylate (double bond chemical engineering, 281) and epoxy acrylate (double bond chemical engineering, 127-TP20) according to the proportion of 4:2:0.5, then the acrylate is placed in a constant temperature room at 50 ℃ for preheating for 24 hours, and then 28 portions of active monomer (sartomer, HDDA) are used for adjusting the viscosity of the resin, so that the requirement of a dispersion process is met. 0.45 part of amine dispersant (BYK-163) is added, and acrylate, active monomer and amine dispersant are fully and uniformly mixed by using a dispersion machine (the rotating speed is 1000 r/min, 12 min). Then, 4.5 parts of pigment consisting of 1.5 parts of carbon black 1# (Mitsubishi, A100) and 3 parts of carbon black 2# (AS-702G) and 4.5 parts of inorganic filler calcium carbonate and barium sulfate are added into a dispersion machine, then the gear of the dispersion machine is adjusted to standard parameters (the rotating speed is 1200 r/min, 22.5min), after a mixture is obtained, a three-roller machine is used for grinding for 5 times, and a semi-finished product color paste is formed for standby. And mixing 10.5 parts of phosphine oxide photoinitiator 819 and 7 parts of active monomer, fully stirring until phosphine oxide photoinitiator particles are completely dissolved, adding the semi-finished product color paste, 0.65 part of organic silicon defoamer and 0.4 part of organic silicon leveling agent, and fully and uniformly dispersing by using a dispersion machine (the rotating speed is 1000 revolutions per minute and 17.5 minutes) to finally obtain the product.
The high hiding black UV screen ink was tested to a viscosity of 2 kilo cps (25 + -1 deg.C) using a viscometer (5# 20).
Example two
According to the weight portion, the aliphatic polyurethane acrylate (sartomer, CN9006), the polyester acrylate (sartomer, CN704) and the epoxy acrylate (sartomer, CN119) are mixed according to the proportion of 4:2:0.5 to form 65 portions of acrylate, then the acrylate is placed in a constant temperature room at 50 ℃ for preheating for 24 hours, and then 25 portions of active monomer (sartomer, HDDA, TMPTA) are used for adjusting the viscosity of the resin to meet the requirement of the dispersion process. 2 parts of amine dispersant (BYK-163) is added, and acrylate, active monomer and amine dispersant are fully and uniformly mixed by using a dispersion machine (the rotating speed is 1000 r/min, 10 min). Then, 4 parts of pigment consisting of 1.2 parts of carbon black 1# (Mitsubishi, A100) and 3.7 parts of carbon black 2# (AS-702G) and 4.5 parts of inorganic filler calcium carbonate and barium sulfate are added into a dispersion machine, then the gear of the dispersion machine is adjusted to standard parameters (the rotating speed is 1200 r/min, 25min), after a mixture is obtained, a three-roller machine is used for grinding for 5 times, and a semi-finished product color paste is formed for standby. And mixing 11 parts of phosphine oxide photoinitiator TPO and 10 parts of active monomer, fully stirring until phosphine oxide photoinitiator particles are completely dissolved, adding the semi-finished product color paste, 0.5 part of organic silicon defoamer and 0.5 part of organic silicon leveling agent, and fully and uniformly dispersing by using a dispersion machine (the rotating speed is 800 r/min and 20 min).
The high hiding black UV screen ink was tested to a viscosity of 2.5 cps (25 + -1 deg.C) using a viscometer (5# 20).
EXAMPLE III
According to the weight portion, 68 portions of acrylate are formed by mixing aliphatic polyurethane acrylate (double bond chemical engineering, 5290), polyester acrylate (double bond chemical engineering, 281) and epoxy acrylate (double bond chemical engineering, 127-TP20) according to the proportion of 4:2:0.5, then the acrylate is placed in a constant temperature room at 50 ℃ for preheating for 24 hours, and then 20 portions of active monomer (sartomer, HDDA) are used for adjusting the viscosity of the resin, so that the requirement of a dispersion process is met. 2.1 parts of amine dispersant (BYK-163) is added, and acrylate, active monomer and amine dispersant are fully and uniformly mixed by using a dispersion machine (the rotating speed is 1000 r/min, 10 min). Then, 7 parts of pigment consisting of 1.8 parts of carbon black 1# (AS-25 TK) and 3.6 parts of carbon black 2# (AS-99A) and 6 parts of inorganic filler calcium carbonate and barium sulfate are added into a dispersion machine, then the gear of the dispersion machine is adjusted to standard parameters (the rotating speed is 1200 r/min, 25min), after a mixture is obtained, a three-roller machine is used for grinding for 5 times, and a semi-finished product color paste is formed for standby. And mixing and fully stirring 15 parts of phosphine oxide photoinitiator TPO/819 and 9 parts of active monomer until phosphine oxide photoinitiator particles are completely dissolved, adding the semi-finished product color paste, 0.55 part of organic silicon defoamer and 0.7 part of organic silicon leveling agent, and fully and uniformly dispersing by using a dispersion machine (the rotating speed is 800 r/min and 20 min).
The high hiding black UV screen ink was tested to a viscosity of 2.8 cps (25 + -1 deg.C) using a viscometer (5# 20).
Example four
According to the weight portion, 77 portions of acrylate are formed by mixing aliphatic polyurethane acrylate (sartomer, CN9006), polyester acrylate (sartomer, CN704) and epoxy acrylate (sartomer, CN119) according to the proportion of 4:2:0.5, then the mixture is placed in a constant temperature room at 50 ℃ for preheating for 24 hours, and then 26 portions of active monomer (sartomer, HDDA) are used for adjusting the viscosity of the resin, so that the requirement of a dispersion process is met. 0.6 part of amine dispersant (BYK-163) is added, and acrylate, active monomer and amine dispersant are fully and uniformly mixed by using a dispersion machine (the rotating speed is 1000 r/min, 10 min). Then 5 parts of pigment consisting of 1.3 parts of carbon black 1# (AS-25 TK) and 3.6 parts of carbon black 2# (AS-99A) and 5 parts of inorganic filler calcium carbonate and barium sulfate are added into a dispersion machine, then the gear of the dispersion machine is adjusted to standard parameters (the rotating speed is 1200 r/min, 25min), after a mixture is obtained, a three-roller machine is used for grinding for 5 times, and a semi-finished product color paste is formed for standby. And mixing 8 parts of phosphine oxide photoinitiator TPO/819 and 6 parts of active monomer, fully stirring until phosphine oxide photoinitiator particles are completely dissolved, adding the semi-finished product color paste, 0.55 part of organic silicon defoamer and 0.75 part of organic silicon leveling agent, and fully and uniformly dispersing by using a dispersion machine (the rotating speed is 800 r/min and 20 min).
The high hiding black UV screen ink was tested for 3 kilo cps (25 + -1 deg.C) using a viscometer (5# 20).
EXAMPLE five
According to the weight portion, 80 portions of acrylate are formed by mixing aliphatic polyurethane acrylate (double bond chemical engineering, 5290), polyester acrylate (double bond chemical engineering, 281) and epoxy acrylate (double bond chemical engineering, 127-TP20) according to the proportion of 4:2:0.5, then the acrylate is placed in a constant temperature room at 50 ℃ for preheating for 24 hours, and 24 portions of active monomer (sartomer, HDDA, TMPTA) are used for adjusting the viscosity of the resin, so that the requirement of the dispersion process is met. 2 parts of amine dispersant (BYK-163) is added, and acrylate, active monomer and amine dispersant are fully and uniformly mixed by using a dispersion machine (the rotating speed is 1000 r/min, 10 min). Then, 4 parts of pigment consisting of 1.4 parts of carbon black 1# (Mitsubishi, A100) and 3 parts of carbon black 2# (AS-99A) and 6 parts of inorganic filler calcium carbonate and barium sulfate are added into a dispersion machine, then the gear of the dispersion machine is adjusted to standard parameters (the rotating speed is 1200 r/min, 25min), after a mixture is obtained, a three-roller machine is used for grinding for 5 times, and a semi-finished product color paste is formed for standby. And mixing and fully stirring 15.5 parts of phosphine oxide photoinitiator TPO/819 and 10 parts of active monomer until phosphine oxide photoinitiator particles are completely dissolved, adding the semi-finished product color paste, 0.8 part of organic silicon defoamer and 0.7 part of organic silicon leveling agent, and fully and uniformly dispersing by using a dispersion machine (the rotating speed is 800 r/min and 20 min).
The high hiding black UV screen ink was tested to a viscosity of 2.6 cps (25 + -1 deg.C) using a viscometer (5# 20).
EXAMPLE six
Printing the high-covering black UV silk-screen printing ink on the surface of a base material through a silk-screen printing process; and then, a UV cold light source is adopted, and the irradiation time is 25-35 seconds, so that the high-covering UV resin film is obtained, and the film thickness is 7-8 microns.
In the screen printing process, the screen mesh number is 250 meshes, the tension is 21 +/-1N, and the angle is 22.5 degrees.
And (3) performing appearance detection on the cured high-covering-capacity black UV resin film, wherein the film thickness is 7-8 microns, the color is full and gorgeous, the coating has no pinholes, sand holes, light transmission, poor printing such as shrinkage oil and the like, and the detection fineness of a scraper fineness meter is less than 5 microns.
Alcohol resistance (500gf, 99.5% ethanol), adhesion (3M610 adhesive tape, one hundred lattice method), abrasion resistance (512 rubber, 500gf) and covering power (spectrophotometer) test, and the results are shown in Table 1, so that the high-covering black UV screen printing ink has good mechanical property and shading property, good adhesion with a base material, small environmental pollution and improved appearance of the base material.
FIG. 1 is a graph showing the results of adhesion tests of the cured products of example one (B) and the cured product of the prior art (A), and it is apparent that the covering power of the invention is significantly better than that of the product of the prior art, and the adhesion is 5B; the product prepared by the prior art has poor covering performance, and the adhesive force is 4B and can not reach 5B.
Fig. 2 is a wear-resistant test result diagram of the second product of the embodiment, which shows that friction is performed for 300 times, almost no friction trace is seen on the surface, no bottom exposure occurs, and the wear-resistant effect is good.
FIG. 3 is a graph showing the effect of the alcohol resistance test on the third product of the example, and it can be seen that the alcohol resistance test is very good because the surface has only slight friction marks and no bottom is exposed after 500gf friction times with 99.5% ethanol.
TABLE 1 Properties of thermosetting high flame retardant matte ink/PET for PET substrate
The results show that the high-coverage black UV screen printing ink is reasonable in composition, good in component coordination, excellent in system comprehensive performance, suitable for screen printing and good in storage property. The system does not need to increase the use amount of components such as carbon black and the like, thereby avoiding the adverse effects on the appearance and the light-shading property of the product; and the product shading requirement can be met only by one-time printing under the thickness of 7-8 microns, and an unexpected technical effect is achieved.
Claims (8)
1. A preparation method of high-covering black UV screen printing ink is characterized by comprising the following steps:
(1) preheating acrylic ester and mixing with partial active monomer; adding a dispersing agent, and dispersing for the first time; then adding the pigment and the filler in sequence, and dispersing for the second time; grinding to obtain color paste;
(2) mixing a phosphine oxide photoinitiator with the remaining reactive monomer; then adding the color paste, the organic silicon defoaming agent and the organic silicon leveling agent in the step (1), and dispersing uniformly to obtain high-coverage black UV screen printing ink;
the high-covering black UV screen printing ink comprises the following components in parts by weight:
60-80 parts of acrylate
20-40 parts of active monomer
0.3 to 2.1 portions of dispersant
3-7 parts of pigment
4-6 parts of inorganic filler
7-15 parts of phosphine oxide photoinitiator
0.2 to 0.8 portion of organic silicon defoamer
0.2-0.8 part of organic silicon flatting agent
The acrylate is one or more of hexa-functionality aliphatic polyurethane acrylate, difunctional polyester acrylate and difunctional epoxy acrylate;
the pigment consists of carbon black with the particle size of 25-30 microns and carbon black with the particle size of 15-20 microns.
2. The method for preparing the high-hiding black UV screen printing ink as claimed in claim 1, wherein the method comprises the following steps: the phosphine oxide photoinitiator is one or two of 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide and bis (2,4, 6-trimethylbenzoyl) -phenyl phosphine oxide.
3. The method for preparing the high-hiding black UV screen printing ink as claimed in claim 1, wherein the method comprises the following steps: the acrylate is a mixture of hexafunctional aliphatic urethane acrylate, difunctional polyester acrylate and difunctional epoxy acrylate.
4. The method for preparing the high-hiding black UV screen printing ink as claimed in claim 1, wherein the method comprises the following steps: the active monomer is a mixture of 1, 6-hexanediol diacrylate and trimethylolpropane triacrylate.
5. The method for preparing the high-hiding black UV screen printing ink as claimed in claim 1, wherein the method comprises the following steps: the mass ratio of the carbon black with the particle size of 25-30 microns to the carbon black with the particle size of 15-20 microns is (2-3): 1.
6. The method for preparing the high-hiding black UV screen printing ink as claimed in claim 1, wherein the method comprises the following steps: the inorganic filler comprises calcium carbonate and barium sulfate; the dispersant is an amino dispersant; the defoaming agent is dimethyl polysiloxane; the leveling agent is polysiloxane polyether copolymer.
7. The method for preparing the high-hiding black UV screen printing ink as claimed in claim 1, wherein the method comprises the following steps: the high-covering black UV screen printing ink comprises the following components in parts by weight:
65-70 parts of acrylate
25-30 parts of active monomer
0.4 to 0.5 portion of amino dispersant
4-5 parts of pigment
4-5 parts of inorganic filler
9-12 parts of phosphine oxide photoinitiator
0.5-0.8 part of organic silicon defoaming agent
0.3-0.5 part of organic silicon flatting agent.
8. The method for preparing the high-hiding black UV screen printing ink as claimed in claim 1, wherein the method comprises the following steps: preheating the acrylic ester in the step (1) for 24 hours at 50 ℃; the first dispersion rotating speed is 800-; the second dispersion rotation speed is 1000-; when the step (2) is dispersed, the rotating speed is 800-.
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| CN201911362024.0A CN111196902A (en) | 2015-05-26 | 2015-05-26 | Preparation method of high-covering black UV (ultraviolet) screen printing ink |
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| CN201911362024.0A CN111196902A (en) | 2015-05-26 | 2015-05-26 | Preparation method of high-covering black UV (ultraviolet) screen printing ink |
| CN201510275592.2A CN106280686B (en) | 2015-05-26 | 2015-05-26 | High-covering black UV screen printing ink |
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| CN201911362028.9A Active CN111117342B (en) | 2015-05-26 | 2015-05-26 | Preparation method of high-covering UV resin film |
| CN201911362024.0A Pending CN111196902A (en) | 2015-05-26 | 2015-05-26 | Preparation method of high-covering black UV (ultraviolet) screen printing ink |
| CN201911362022.1A Pending CN111187538A (en) | 2015-05-26 | 2015-05-26 | High hiding UV resin film |
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| CN112011203A (en) * | 2020-09-07 | 2020-12-01 | 苏州市贝特利高分子材料股份有限公司 | High-wear-resistance water-based elastic coating for surface decoration of plastic material |
| CN117210051A (en) * | 2023-09-28 | 2023-12-12 | 广东科美达新材料科技有限公司 | Automobile wood grain holographic texture optical intelligent display screen silk-screen printing ink and preparation method thereof |
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| CN100420724C (en) * | 2005-05-11 | 2008-09-24 | 中国乐凯胶片集团公司 | UV photocureable magnetic offset lithography printing ink |
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| CN100487500C (en) * | 2005-11-30 | 2009-05-13 | 东洋油墨制造株式会社 | Black composition and its production method |
| JP5156300B2 (en) * | 2007-08-29 | 2013-03-06 | 株式会社デンソー | Meter dial of vehicle instrument and manufacturing method thereof |
| CN101560348B (en) * | 2009-05-25 | 2011-11-09 | 王景泉 | Ultraviolet light curing offset printing ink and preparation method thereof |
| JP5634287B2 (en) * | 2011-02-07 | 2014-12-03 | Ｄｉｃグラフィックス株式会社 | UV light emitting diode curable ink |
| CN102643576B (en) * | 2012-04-27 | 2013-07-03 | 武汉虹之彩包装印刷有限公司 | Ultraviolet light cured silk screen snowflake printing ink and preparation method thereof |
| CN104263063B (en) * | 2014-10-11 | 2016-06-08 | 武汉长盈通光电技术有限公司 | The optical fiber coloring ink of radiation-hardenable |
| CN104497697A (en) * | 2014-12-23 | 2015-04-08 | 广州市尤特新材料有限公司 | LED-UV photocurable screen printing halogen-free glass ink |
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2015
- 2015-05-26 CN CN201510275592.2A patent/CN106280686B/en active Active
- 2015-05-26 CN CN201911362028.9A patent/CN111117342B/en active Active
- 2015-05-26 CN CN201911362024.0A patent/CN111196902A/en active Pending
- 2015-05-26 CN CN201911362022.1A patent/CN111187538A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112011203A (en) * | 2020-09-07 | 2020-12-01 | 苏州市贝特利高分子材料股份有限公司 | High-wear-resistance water-based elastic coating for surface decoration of plastic material |
| CN117210051A (en) * | 2023-09-28 | 2023-12-12 | 广东科美达新材料科技有限公司 | Automobile wood grain holographic texture optical intelligent display screen silk-screen printing ink and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111117342A (en) | 2020-05-08 |
| CN111117342B (en) | 2022-04-08 |
| CN106280686A (en) | 2017-01-04 |
| CN106280686B (en) | 2019-12-20 |
| CN111187538A (en) | 2020-05-22 |
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Application publication date: 20200526 |