CN103224731B - Pinkish red UV ink-jet ink for high-speed ink-jet printing and preparation method thereof - Google Patents

Abstract

The invention relates to a magenta UV inkjet ink for high-speed inkjet printing and a preparation method thereof. The printing material is mainly paper, and belongs to the technical field of digital printing. The composition and weight ratio of the ink are: 15-30 parts of color paste, 20-35 parts of monomer, 40-50 parts of film-forming resin, 1-10 parts of photoinitiator; 10-25 parts of magenta pigment in the color paste formula , 15-30 parts of prepolymer, 40-60 parts of monomer, 4-10 parts of dispersant. The ink of the present invention can be prepared by stirring and high-speed grinding. The magenta UV inkjet ink of the present invention meets the requirements of inkjet printing, the particle size is less than 0.5μm, the viscosity is 20~30cP (25°C), the surface tension is 20~35mN/m (25°C), and the curing speed is 30~50m /min (the power of the light source is 200W/cm), and the conductivity is <18μs/cm.

Description

A kind of magenta UV ink-jet ink for high-speed ink-jet printing and preparation method thereof

technical field

The invention relates to a magenta ultraviolet (UV) inkjet ink for high-speed inkjet printing and a preparation method thereof. The printing material is mainly paper, and belongs to the technical field of digital printing.

Background technique

The key advantage of UV curing technology is that it does not contain solvents, has no VOC emissions, and avoids the impact of traditional solvent-based inks on the environment. It is considered a "green technology" and can achieve instant curing. The drying speed of the ink is higher than that of Water-based or solvent-based inks, but UV inks are mainly used in traditional printing methods, such as offset printing, silk screen printing, etc. As a kind of digital printing technology, inkjet printing has the advantages of non-impact transfer printing, simple operation, and low requirements for printing materials. Printing equipment that combines UV curing technology with inkjet printing has been released. For the corresponding UV inkjet printing Ink demand will increase.

At present, patents have proposed a variety of radiation-curable inkjet inks, but the application of these inks is limited to inkjet printing, printing and dyeing, and is far from meeting the requirements of high-speed inkjet printing.

Contents of the invention

The invention provides a novel magenta UV inkjet ink formula and a preparation method thereof. The printing method of this UV inkjet ink research and development is high-speed inkjet printing, and its printing material is mainly paper. In order to meet the requirements of high-speed inkjet printing, the physical and chemical properties of the ink must meet the needs of related inkjet printing equipment. Since the pigment is insoluble in the system, the dispersibility and dispersion stability of the pigment particles in the system are one of the important properties, otherwise it will lead to the clogging of the nozzle. The UV system is different from water and solvents, and the pigment particles must be able to disperse evenly in the system and maintain Stability can prevent the phenomenon of agglomeration to prevent nozzle clogging. The particle size of ordinary water-based and solvent-based inkjet inks or UV inks used for inkjet printing and printing and dyeing is generally above 1 μm, while UV inks used for high-speed inkjet printing It needs to be 0.5 μm or less. The two most important on-demand inkjet technologies in the market are thermal inkjet and piezoelectric inkjet. The nozzles with different working methods have different requirements for ink viscosity. According to the type of ink, they can be divided into water-based nozzles, solvent-based nozzles and UV nozzles. Nozzles, the UV nozzles launched by SPECTRA and XAAR have been used in UV inkjet printers. Most of the UV nozzles are piezoelectric types, which require high ink viscosity, usually 20-30cP (25°C). UV inkjet ink is irradiated by ultraviolet light, each component in the system reacts and cures, and the curing speed is required to be 30-50m/min (the line power of the light source is 200W/cm). In inkjet printing, the ejection and forming process of ink droplets will be affected by the physical properties of the fluid. Jet necking is a necessary prerequisite for the formation of ink droplets, and surface tension is the main driving force for jet necking. Therefore, the surface tension of ink is The power source of ink drop ejection affects the final shape and flight trajectory of ink droplets, and even affects the final reproduction quality. The surface tension requirement is 20-35mN/m (25°C).

In order to achieve the above object, the present invention takes the following technical solutions:

A magenta UV inkjet ink, mainly used for high-speed inkjet printing, consists of pigments, prepolymers, monomers and additives, specifically including the following composition and weight ratio:

Ink formula:

Among them, the color paste formula (weight ratio) is:

The magenta pigment in the present invention is an insoluble coloring agent with good water resistance and color fastness, and is selected from azo red, magenta, quinacridone red, quinacridone and diketopyrrolopyrrole mixed red, etc. One of.

The prepolymer and film-forming resin are respectively selected from epoxy acrylic resin, polyurethane acrylic resin, polyester acrylic resin, vinyl acetate resin, aminoacrylic resin, alkyd resin, urea-formaldehyde resin, methyl etherified amino resin, butyl One or more mixtures of etherified amino resin, bisphenol A epoxy acrylate, UV fluorocarbon resin and phosphoric acid modified acrylate. The prepolymer and film-forming resin may be the same or different.

The monomers are 2-phenoxyethyl acrylate, butyl acrylate, urethane monoacrylate, isobornyl acrylate, isobornyl methacrylate, dicyclopentenyl acrylate, acrylic acid 2 -Ethoxyethoxyethyl ester, 1,4-butanediol diacrylate, propoxylated neopentyl glycol diacrylate, triethylene glycol dimethacrylate, 2-ethylhexyl acrylate Ester, Hexylene Glycol Diacrylate, Diethylene Glycol Diacrylate, Neopentyl Glycol Diacrylate, Triethylene Glycol Diacrylate, Tripropylene Glycol Diacrylate, Trimethylol Propane One of triacrylate, ethoxylated trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, propoxylated trimethylolpropane triacrylate, dipentaerythritol hexaacrylate or A mixture of two or more.

The dispersant is one or more of modified acrylate block copolymers, alkene acid block copolymers, hyperdispersants with anchor groups and organically modified polysiloxanes. It is preferably the modified acrylate block copolymer of the disperbyk series of BYK company, the olefin acid block copolymer of the EFKA series of BASF company, the CH series hyperdispersant with anchor group of Shanghai Sanzheng company, TEGO The company's dispersers series of wetting and dispersing agents containing organomodified polysiloxanes.

The photoinitiator is phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide, 1-(4-morpholine phenyl)-2-(dimethylamine)-2-benzyl -1-butanone, 2-benzoylbenzoic acid methyl ester, 4-phenylbenzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2 -Methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl-phenylmethanone, 2-methyl-1-[4-methylthiophenyl]-2-morpholinyl-1 - One or a mixture of two or more of acetone, benzoin dimethyl ether, 2-isopropylthioxanthone and 2,4-diethylthioxanthone.

The hydrogen abstraction photoinitiator needs to be combined with a co-initiator-hydrogen donor, and the hydrogen donor is mainly a tertiary amine compound, such as aliphatic tertiary amine, ethanolamine tertiary amine, tertiary amine benzoate, active amine, etc. The photoinitiator 2-isopropylthioxanthone and 2,4-diethylthioxanthone are hydrogen abstraction type, need hydrogen donor, the weight ratio is 2-isopropylthioxanthone or 2,4 - Diethylthioxanthone: hydrogen donor = 2:1.

The leveling agent is one or more of polyacrylate polymers, polyether-modified polysiloxane copolymers, and silicone polymers. Changzhou Hongya Chemical Co., Ltd. HY3066 and BYK Company BYK-300, BYK-306, BYK-307, BYK-310, BYK-315, BYK-320, BYK-323, BYK-325, BYK-331, BYK- 333, BYK-335, BYK-337, BYK-344, BYK-346, BYK-354, BYK-356, BYK-358N, BYK-361N, BYK-370, BYK-371, BYK-390, BYK-410, Polyacrylate polymer of BYK-077, polyether-modified polysiloxane copolymer of BNK-LK600 of Changhui Group and DN-1082 of Nanjing Denuo Chemical Industry Co., Ltd. 100, 300, 432, 435, 460, 450, 484 silicone polymers.

The preparation method of above-mentioned magenta UV inkjet ink, comprises the steps:

(1) Mix the prepolymer, monomer and dispersant, stir and mix evenly to obtain component A;

(2) Add magenta pigment to component A, place it on an electric mixer for pre-dispersion, then pour it into a grinder for high-speed grinding, so that the pigment is in the binder (film-forming resin, monomer and dispersant) Fully wet and disperse to obtain ink color paste, that is, component B;

(3) Mix the film-forming resin, monomer, leveling agent and photoinitiator or photoinitiator and co-initiator according to the ink formula to prepare ink diluent to obtain component C;

(4) Mix component B and component C, and stir evenly with an electric mixer to obtain the ink.

In step (1), the component A is placed on a constant temperature magnetic stirrer to stir and mix evenly, and the stirring time is 20-40min, (normal temperature). If it is a solid dispersant, it must be heated at a certain temperature to dissolve it.

In step (2), the pre-dispersion time of the B component is 20-40 minutes, and the pre-dispersion rate is 330r/min-800r/min. The high-speed grinding time is 60~120mim, and the speed of high-speed grinding is 1800r/min~2500r/min.

In step (4), the components B and C are mixed, and the stirring time is 30-60 min.

The magenta UV inkjet ink of the present invention meets the requirements of inkjet printing, the particle size is less than 0.5μm, the viscosity is 20-30cP (25°C), the surface tension is 20-35mN/m (25°C), and the curing speed is 30-50m /min (the line power of the light source is 200W/cm), the conductivity is <18μs/cm, and the printing sample is obtained by printing with a UV inkjet printer with a speed of 80m/min, and the printing sample is evaluated by the digital quality evaluation system based on industrial CCD Evaluation, printing quality is good.

The preparation method of the magenta UV inkjet ink of the present invention comprises two steps of preparing the color paste and the ink, and the required equipment is an electric stirrer and high-speed grinding equipment, and the process is simple.

The magenta UV inkjet ink of the present invention is prepared and processed from commercially available pigments, prepolymers, monomers and auxiliary agents. The magenta UV inkjet ink of the present invention can be applied to inkjet printing equipment, mainly for short-run printing jobs, can realize on-demand and variable data printing, and is easy to operate.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, various changes or modifications made by those skilled in the art to the present invention, and these equivalent forms also fall within the scope of protection claimed by the present application. The proportions in the embodiments of the present invention are all by weight.

【Example 1】

Mix 30 parts of prepolymer, 42 parts of monomer, and 8 parts of dispersant, place on a constant temperature magnetic stirrer and stir for 30 minutes to mix evenly; add 20 parts of azo red, and use a stirrer to stir the mixture for 30 minutes for pre-dispersion , using a high-speed grinder to grind for 90 minutes to obtain a magenta ink paste. Wherein the azo red is selected from the RT-355-D of Ciba, the prepolymer is a hyperbranched polyester acrylic resin selected from the EB150 series of Cytec, and the monomer is commercially available acrylic acid 2-ethoxyethoxy Mixture of ethyl ester, hexanediol diacrylate and trimethylolpropane triacrylate in the ratio of 2-ethoxyethoxyethyl acrylate, hexanediol diacrylate and trimethylolpropane triacrylate= 5:3:2 (weight ratio), the dispersant is a dispersant containing organically modified polysiloxane selected from the dispersers series of TEGO Company.

Mix 20 parts of monomer, 50 parts of film-forming resin, and 10 parts of photoinitiator (including hydrogen donor active amine), add 20 parts of color paste, and stir with a stirrer for 30 minutes to obtain magenta UV inkjet ink. The monomer is a commercially available mixture of 2-ethoxyethoxyethyl acrylate, hexanediol diacrylate and trimethylolpropane triacrylate in a ratio of 2-ethoxyethoxyethyl acrylate, hexanediol Alcohol diacrylate and trimethylolpropane triacrylate = 5:3:2 (weight ratio), the film-forming resin is a hyperbranched polyester acrylic resin selected from Cytec's EB150 series, and the photoinitiator is 2- A mixture of methyl-1-[4-methylthiophenyl]-2-morpholinyl-1-propanone, 2-isopropylthioxanthone and their hydrogen-donating active amines in the ratio of 2-methyl -1-[4-methylthiophenyl]-2-morpholino-1-propanone:2-isopropylthioxanthone:active amine=2:2:1 (weight ratio).

[Example 2]

Mix 30 parts of prepolymer, 51 parts of monomer, and 4 parts of dispersant, place on a constant temperature magnetic stirrer and stir for 30 minutes to mix evenly; add 15 parts of quinacridone red, and use a stirrer to stir the mixture for 30 minutes for pre-treatment. After dispersion, use a high-speed grinder to grind for 90 minutes to obtain a magenta ink paste. Wherein the quinacridone red is selected from Ciba Company's Micro Korea 5B-K, the prepolymer is a commercially available polyester acrylate, and the monomer is a commercially available 2-phenoxyethyl acrylate, phthalic acid A mixture of diethanol diacrylate and ethoxylated trimethylolpropane triacrylate in a ratio of 2-phenoxyethyl acrylate: phthalate diethanol diacrylate: ethoxylated Trimethylolpropane triacrylate=9:6:1 (weight ratio), and the dispersant is EFKA series selected from BASF Company.

Mix 30 parts of monomer, 46 parts of film-forming resin, 1 part of photoinitiator (including hydrogen donor active amine), and 5 parts of leveling agent, add 20 parts of color paste, and stir for 30 minutes with a stirrer to obtain magenta UV inkjet ink. The monomer is a commercially available mixture of 2-phenoxyethyl acrylate, diethylene phthalate diacrylate, and ethoxylated trimethylolpropane triacrylate in proportions of 2-phenoxy acrylate Ethylacrylate: phthalate diethylene diacrylate: ethoxylated trimethylolpropane triacrylate = 9:6:1 (weight ratio), film-forming resin is hyperbranched polyester acrylic resin Selected from Cytec's EB150 series, the photoinitiator is a mixture of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-isopropylthioxanthone and its hydrogen donor active amine , the ratio is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide:2-isopropylthioxanthone:active amine=1:2:1 (weight ratio), the leveling agent is long Fai Group's BNK-LK600.

[Example 3]

Mix 30 parts of prepolymer, 48 parts of monomer, and 12 parts of dispersant, and stir for 30 minutes to mix evenly; add 10 parts of azo red, use a stirrer to stir the mixture for 30 minutes for pre-dispersion, and use a high-speed grinder to grind for 60 Minutes to get magenta ink paste. Wherein the azo red is selected from the RT-355-D of Ciba Company, the prepolymer is commercially available polyester acrylate, and the monomer is commercially available isobornyl acrylate, triethylene glycol dimethacrylate and trimethylolpropane trimethacrylate, the ratio is isobornyl acrylate: triethylene glycol dimethacrylate: trimethylolpropane trimethacrylate = 7:9:4 ( weight ratio), the dispersant is byk-168 selected from BYK company.

Mix 20 parts of monomer, 42 parts of film-forming resin, 6 parts of photoinitiator, and 2 parts of leveling agent, add 30 parts of color paste, and stir for 60 minutes with a stirrer to obtain magenta UV inkjet ink. The monomer is a mixture of commercially available isobornyl acrylate, triethylene glycol dimethacrylate and trimethylolpropane trimethacrylate in a ratio of isobornyl acrylate: triethylene glycol dimethacrylate Methacrylate: trimethylolpropane trimethacrylate=7:9:4 (weight ratio), film-forming resin is high-functional polyester acrylic resin, selected from TJ8901 of Tianjiao Company, photoinitiator is benzoin bis Methyl ether, leveling agent is Tego 460.

【Example 4】

Mix 15 parts of prepolymer, 60 parts of monomer, and 10 parts of dispersant, and stir for 30 minutes to mix evenly; add 15 parts of azo red, use a stirrer to stir the mixture for 30 minutes for pre-dispersion, and use a high-speed grinder to grind 120 Minutes to get magenta ink paste. Wherein the azo red is selected from Clariant's Permanent CarmineFBB02, the prepolymer is a hyperbranched polyester acrylic resin selected from the CN series of SATORMAR company, and the monomer is commercially available 2-ethoxyethoxyethyl acrylate, propoxy A mixture of neopentyl glycol diacrylate and tripropylene glycol diacrylate in a ratio of 2-ethoxyethoxyethyl acrylate: propoxylated neopentyl glycol diacrylate: tripropylene glycol diacrylate Acrylate = 5:6:3 (weight ratio), and the dispersant is an alkene acid block copolymer selected from the EFKA series of BASF.

Mix 27 parts of monomer, 30 parts of film-forming resin, 10 parts of photoinitiator, and 3 parts of leveling agent, add 30 parts of color paste, and stir for 45 minutes with a stirrer to obtain magenta UV inkjet ink. The monomer is a commercially available mixture of 2-ethoxyethoxyethyl acrylate, propoxylated neopentyl glycol diacrylate and tripropylene glycol diacrylate in a ratio of 2-ethoxyethoxyethyl acrylate Ester: propoxylated neopentyl glycol diacrylate: tripropylene glycol diacrylate = 5:6:3 (weight ratio), film-forming resin is polyester acrylic resin, selected from CN series of SATORMAR company, light The initiator is a mixture of 2-hydroxy-2-methyl-1-phenyl-1-propanone and 1-hydroxy-cyclohexyl-phenylmethanone, the weight ratio of 2-hydroxy-2-methyl-1- Phenyl-1-propanone: 1-hydroxy-cyclohexyl-phenyl ketone = 1:1, leveling agent is DN-1082 of Nanjing Denuo Chemical Industry.

【Example 5】

Mix 30 parts of prepolymer, 40 parts of monomer, and 5 parts of dispersant, and stir for 30 minutes to mix evenly; add 25 parts of quinacridone red, use a stirrer to stir the mixture for 30 minutes for pre-dispersion, and use a high-speed grinder Grinding for 90 minutes yielded a magenta ink paste. Among them, quinacridone red is selected from Ciba's micro-Korea 5B-K, and the prepolymer is a hyperbranched polyester acrylic resin selected from Cytek's EB150 series, and the monomer is commercially available acrylic acid 2-ethoxyethylene A mixture of oxyethyl ester and trimethylolpropane triacrylate, the ratio is 2-ethoxyethoxyethyl acrylate and trimethylolpropane triacrylate = 3:2 (weight ratio), the dispersant is tape The hyperdispersant with anchor group is selected from the CH series of Shanghai Sanzheng Company.

Mix 30 parts of monomer, 50 parts of film-forming resin, and 5 parts of photoinitiator (including hydrogen donor active amine), add 15 parts of color paste, and stir for 60 minutes with a stirrer to obtain magenta UV inkjet ink. The monomer is a commercially available mixture of 2-ethoxyethoxyethyl acrylate and trimethylolpropane triacrylate in a ratio of 2-ethoxyethoxyethyl acrylate to trimethylolpropane triacrylate= 3:2 (weight ratio), the film-forming resin is hyperbranched polyester acrylic resin selected from the EB150 series of Cytec, the photoinitiator is 2-isopropylthioxanthone and its hydrogen donor active amine, the ratio It is 2-isopropylthioxanthone:active amine=2:1 (weight ratio).

[Example 6]

Mix 25 parts of prepolymer, 40 parts of monomer, and 10 parts of dispersant, and stir for 30 minutes to mix evenly; add 25 parts of quinacridone and diketopyrrolopyrrole mixed red, and use a stirrer to stir the mixture for 30 minutes for pretreatment. After dispersion, use a high-speed grinder to grind for 60 minutes to obtain a magenta ink paste. Wherein the mixed red of quinacridone and diketopyrrolopyrrole is selected from the micro-Korea 4B-K of Ciba Company, the prepolymer is a commercially available polyurethane acrylic resin, and the monomer is a commercially available acrylic acid 2-ethoxyethoxy Ethyl ester, a mixture of tripropylene glycol diacrylate and neopentyl glycol diacrylate in the ratio 2-ethoxyethoxyethyl acrylate:tripropylene glycol diacrylate and neopentyl glycol diacrylate= 2:3:3 (weight ratio), the dispersant is an alkene acid block copolymer selected from the EFKA series of BASF.

Mix 35 parts of monomer, 40 parts of film-forming resin, and 5 parts of photoinitiator (including hydrogen donor active amine), add 20 parts of color paste, and stir for 60 minutes with a stirrer to obtain magenta UV inkjet ink. The monomer is a mixture of commercially available 2-ethoxyethoxyethyl acrylate, tripropylene glycol diacrylate and neopentyl glycol diacrylate in a ratio of 2-ethoxyethoxyethyl acrylate:dipropylene glycol diacrylate Tripropylene glycol diacrylate and neopentyl glycol diacrylate=2:3:3 (weight ratio), the film-forming resin is a high-functional polyester acrylic resin, selected from TJ8901 of Tianjiao Company, and the photoinitiator is 2-methyl - a mixture of 1-[4-methylthiophenyl]-2-morpholinyl-1-propanone, 2-isopropylthioxanthone and its hydrogen-donating active amine in the ratio of 2-methyl-1 -[4-methylthiophenyl]-2-morpholino-1-propanone:2-isopropylthioxanthone:active amine=2:2:1 (weight ratio).

The properties of the inks prepared in Examples 1-6 are shown in Table 1. The magenta UV inkjet ink prepared by the present invention meets the requirements of inkjet printing, the particle size is less than 0.5 μm, the viscosity is 20~30cP (25°C), the surface tension is 20~35mN/m (25°C), and the curing speed is 30~50m/min (line power of light source is 200W/cm), conductivity <18μs/cm.

The prepared ink performance of table 1 embodiment 1-6

Note: Viscosity and surface tension are tested at 25°C, and the linear power of the curing light source is 200W/cm.

Use the ink of the present invention and imported (Sunjet) magenta UV inkjet ink to print using a UV inkjet printer (speed 80m/min) with an XAAR nozzle to obtain a printing sample, and use digital quality based on industrial CCD The evaluation system evaluates the printing proofs. The various test indicators of the magenta UV inkjet ink of the present invention reach the level of imported inks. In terms of printing quality such as blurring of lines, line width, contrast and density of color blocks, the magenta UV inkjet ink of the present invention has the highest printing quality. UV inkjet ink is better than imported ink.

In other embodiments of the present invention, the pigments, prepolymers, film-forming resins, monomers, dispersants, photoinitiators and leveling agents listed in the Summary of the Invention that are different from Examples 1-6 can be used, The performance and application effect of the ink of the present invention can be obtained through different collocations and combinations. The ink of the invention is prepared by stirring and high-speed grinding, and can be applied to high-speed ink-jet printing equipment, which is different from ordinary ink-jet printing and printing and dyeing.

Claims (7)

1. A preparation method for a magenta UV inkjet ink for high-speed inkjet printing, characterized in that: the ink comprises the following composition and weight ratio: Ink formula: Wherein, the weight proportion of color paste is: The magenta pigment is azo red, magenta or quinacridone red; the prepolymer and film-forming resin are respectively epoxy acrylic resin, polyurethane acrylic resin, polyester acrylic resin, vinyl acetate resin, amino One or both of acrylic resin, alkyd resin, urea-formaldehyde resin, methyl etherified amino resin, butylated amino resin, bisphenol A epoxy acrylate and UV fluorocarbon resin; the monomer is 2- Phenoxyethyl Acrylate, Butyl Acrylate, Isobornyl Acrylate, Isobornyl Methacrylate, Dicyclopentenyl Acrylate, 2-Ethoxyethoxyethyl Acrylate, 1,4-Butanediol Diacrylate, Propoxylated Neopentyl Glycol Diacrylate, Triethylene Glycol Dimethacrylate, 2-Ethylhexyl Acrylate, Hexylene Glycol Diacrylate, Neopentyl Glycol Diacrylate , triethylene glycol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, trimethylolpropane trimethyl One or both of acrylates, propoxylated trimethylolpropane triacrylate and dipentaerythritol hexaacrylate; The preparation method of described magenta UV inkjet ink, comprises the steps: (1) Mix the prepolymer, monomer and dispersant, stir and mix evenly to obtain component A; (2) Add magenta pigment into component A, place it on an electric mixer for pre-dispersion, then pour it into a grinder for high-speed grinding, so that the pigment is fully wetted and dispersed in the binder, and the ink color paste is obtained, that is B component; (3) mixing film-forming resin, monomer, leveling agent and photoinitiator or photoinitiator and co-initiator to prepare ink diluent to obtain C component; (4) Mix component B and component C and stir evenly with an electric mixer to obtain the ink. 2. the preparation method of the magenta UV inkjet ink that is used for high-speed inkjet printing according to claim 1, is characterized in that: described dispersant is the hyperdispersant with anchor group and organic modification One or more of polysiloxanes; the leveling agent is one or more of polyacrylate polymers, polyether-modified polysiloxane copolymers and silicone polymers. 3. the preparation method of the magenta UV inkjet ink that is used for high-speed inkjet printing according to claim 1, is characterized in that: described photoinitiator is phenyl bis (2,4,6-trimethyl Benzoyl)phosphine oxide, 1-(4-morpholinephenyl)-2-(dimethylamine)-2-benzyl-1-butanone, 2-benzoylbenzoic acid methyl ester, 4-benzene benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxy-cyclohexyl -Phenyl ketone, 2-methyl-1-[4-methylthiophenyl]-2-morpholinyl-1-propanone, benzoin dimethyl ether, 2-isopropylthioxanthone and 2, One or more of 4-diethylthioxanthone. 4. The method for preparing a magenta UV inkjet ink for high-speed inkjet printing according to claim 1, characterized in that: when the dispersant is in a solid state, it is first heated to dissolve it. 5. The preparation method of magenta UV inkjet ink for high-speed inkjet printing according to claim 1, characterized in that: said A component is stirred by a constant temperature magnetic stirrer, and the stirring time is 20 to 40min. The pre-dispersion time of the B component is 20-40 min, the high-speed grinding time is 60-120 min, and the B component and C component are mixed, and the stirring time is 30-60 min. 6. according to the preparation method of the magenta UV inkjet ink that is used for high-speed inkjet printing according to any one of claim 1-5, it is characterized in that: the particle diameter of described magenta UV inkjet ink is less than 0.5 μm, at 25°C, the viscosity is 20-30cP, the surface tension is 20-35mN/m, when the light source line power is 200W/cm, the curing speed is 30-50m/min, the conductivity is <18μs/cm, which meets the requirements of inkjet printing requirements. 7. the magenta UV inkjet ink that the preparation method of the magenta UV inkjet ink that is used for high-speed inkjet printing according to any one of claim 1-5 obtains.