CN111349366B - UV-LED inkjet ink for PVC leather printing and preparation method thereof - Google Patents
UV-LED inkjet ink for PVC leather printing and preparation method thereof Download PDFInfo
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- CN111349366B CN111349366B CN202010335776.4A CN202010335776A CN111349366B CN 111349366 B CN111349366 B CN 111349366B CN 202010335776 A CN202010335776 A CN 202010335776A CN 111349366 B CN111349366 B CN 111349366B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5207—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- D06P1/525—Polymers of unsaturated carboxylic acids or functional derivatives thereof
- D06P1/5257—(Meth)acrylic acid
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5264—Macromolecular compounds obtained otherwise than by reactions involving only unsaturated carbon-to-carbon bonds
- D06P1/5285—Polyurethanes; Polyurea; Polyguanides
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5264—Macromolecular compounds obtained otherwise than by reactions involving only unsaturated carbon-to-carbon bonds
- D06P1/5292—Macromolecular compounds obtained otherwise than by reactions involving only unsaturated carbon-to-carbon bonds containing Si-atoms
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/32—Material containing basic nitrogen containing amide groups leather skins
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/30—Ink jet printing
Abstract
The invention discloses UV-LED inkjet ink for PVC leather printing and a preparation method thereof. The itaconic acid ester modified epoxidized soybean oil contains acrylate double bonds and epoxy groups at the same time, and under the irradiation of UV-LED, the double bonds are rapidly cured, so that the ink diffusion is reduced, and the pattern is clear; the epoxy group can be post-cured, so that the phenomenon that the ink film wrinkles or the adhesive force is reduced due to too fast curing is avoided. The itaconic acid ester modified epoxidized soybean oil interacts with the chlorinated polydimethylsiloxane to improve the flexibility and the wear resistance of the ink film. The UV-LED ink-jet ink disclosed by the invention is clear in printing, has 100% of adhesion fastness to PVC leather, is more than 3 ten thousand times in flexing resistance, is more than 200 times in wear resistance, is good in aging resistance, and is suitable for printing PVC leather.
Description
Technical Field
The invention relates to the technical field of PVC leather ink-jet printing, in particular to UV-LED ink-jet ink for PVC leather printing and a preparation method thereof.
Background
The ink-jet method has the advantages of no plate making, suitability for personalized customization, small pollution and the like, and is a research hotspot in replacing the traditional screen printing mode of artificial leather. The existing solvent type pigment ink-jet mostly uses vinyl chloride-vinyl acetate copolymer as a bonding material, and the ink often permeates into the surface layer of leather when the leather is printed, so that the color is light, the luster is reduced, the requirements of customers cannot be met, the VOC content is high, and the environmental protection requirements cannot be met. The invention patent CN200610104941.5 discloses a pigment type ink for digital ink-jet printing of leather, which is prepared by precipitating water-soluble polymers on the surface of the pigment to form stably dispersed nano pigment microcapsules and preparing ink-jet, wherein the ink-jet takes water as a main solvent, is green and environment-friendly, but for non-absorptive PVC leather, the drying speed is a problem which is urgently required to be solved by water-based ink-jet. The UV-LED ink-jet ink for printing PVC leather has low VOC content and high curing speed, and can solve the problems.
At present, the printing of UV-LED ink jet on PVC leather mainly has the following problems: 1) digital printing requires low viscosity of inkjet ink, which is easily dispersed on non-absorbent PVC substrates, resulting in unclear patterns; by increasing the content of the polyfunctional monomer or the photoinitiator in the ink-jet ink, the curing speed can be increased, the ink diffusion can be reduced, and the mechanical property of an ink film can be influenced; 2) the use of leather requires that the ink film has good flexibility and flexing resistance and good wear resistance, but the flexibility and the wear resistance of the ink film are in contradiction, the improvement of the flexibility is mostly based on the sacrifice of the wear resistance, and the polyurethane acrylate has good flexibility and wear resistance but can not completely meet the requirements; 3) the PVC leather has the plasticizer content of more than 40 percent, is easily influenced by temperature, pressure and contact media, is separated out from PVC, and leads printing ink printed on a soft material to be dissolved and shed, so that the surface of the leather produces oil, stickiness and the like, and the contact with a human body can also harm the health of the human body.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the UV-LED ink-jet ink for printing the PVC leather and the preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the itaconate modified epoxidized soybean oil is prepared from components including itaconic anhydride, hydroxyl acrylate and epoxidized soybean oil, and can be used for preparing UV-LED inkjet ink.
Preferably, the molar ratio of the itaconic anhydride to the epoxy group in the hydroxyl acrylate and the epoxy soybean oil is 1:1: 1.5-4.
Itaconic anhydride reacts with-OH of hydroxyl acrylate to generate itaconic acid monoester with one carboxyl and two acrylate double bonds, and the carboxyl of the itaconic acid monoester further reacts with epoxy of the epoxidized soybean oil to generate the itaconic acid ester modified epoxidized soybean oil.
When the mole number of the epoxy groups in the epoxy soybean oil is larger than that of the itaconic acid monoester, the generated itaconic acid ester modified epoxy soybean oil contains both double bonds capable of free radical photocuring and epoxy groups capable of cationic photocuring. The itaconate modified epoxidized soybean oil is used for UV-LED inkjet ink, and double bonds of the itaconate modified epoxidized soybean oil are rapidly crosslinked and cured through free radical reaction under the irradiation of ultraviolet light, so that an ink film is preliminarily shaped, the flow diffusion of ink is reduced, and the definition of patterns is improved; the epoxy group realizes post-curing through cationic reaction, so that the problems of wrinkling, cracking or adhesive force reduction of an ink film and the like caused by excessively high curing speed of the ink are avoided.
However, when the mole number of the epoxy group is larger, the content of the epoxidized soybean oil which is not grafted to the itaconate ester is increased, so that the curing speed of the ink is reduced, the pattern definition is affected, the curing crosslinking degree of an ink film is low, and the wear resistance is poor, therefore, the mole ratio of the epoxy group in the itaconic anhydride, the hydroxy acrylate and the epoxidized soybean oil is preferably 1:1: 1.5-4.
Preferably, the hydroxy acrylate is at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxybutyl acrylate, hydroxybutyl methacrylate and caprolactone acrylate.
The invention also provides a preparation method of the itaconate modified epoxidized soybean oil, which comprises the following steps:
s1, placing itaconic anhydride, hydroxyl acrylate, a polymerization inhibitor and a catalyst in a reaction kettle, adding a solvent for dissolving, introducing nitrogen, heating for reaction, and purifying a product to obtain itaconic acid monoester;
s2, adding the itaconic acid monoester obtained in the step S1, epoxidized soybean oil, a catalyst and a solvent into a reaction kettle, heating for reaction, and purifying a product to obtain the itaconic acid ester modified epoxidized soybean oil.
The polymerization inhibitor in step S1 is a polymerization inhibitor commonly used in the art for the reaction of acid anhydride and hydroxyl, and includes, but is not limited to, p-hydroxyanisole, hydroquinone or benzoquinone. The catalyst is a catalyst commonly used in the art for the reaction of acid anhydride and hydroxyl, and includes, but is not limited to, N-dimethylaminopyridine, p-toluenesulfonic acid, anhydrous sodium ethoxide, zinc chloride or sulfuric acid.
In the step S1, the temperature rise reaction is carried out at 70-90 ℃ for 4-6 h.
The catalyst in step S2 is a catalyst commonly used in the art for the reaction of carboxyl groups and epoxy groups, and includes, but is not limited to, triphenylphosphine, N-dimethylbenzylamine, triethanolamine, triethylbenzylammonium chloride, and the like.
In the step S2, the temperature rise reaction is carried out at a reaction temperature of 90-120 ℃ for 15-20 h.
The solvent in step S1 and step S2 is toluene or xylene.
The viscosity of the itaconate modified epoxidized soybean oil prepared by the invention is lower, generally controlled below 1500mpa & s, and lower than that of acrylic acid modified epoxidized soybean oil (about 2500mpa & s), thereby being more beneficial to the design of a low-viscosity ink-jet formula.
The invention also provides UV-LED inkjet ink for PVC leather printing, which comprises the following components in percentage by weight:
the cured film of the itaconate modified epoxy soybean oil has strong adhesive force and good segment flexibility, can toughen the ink film through crosslinking, improves the bending resistance, and has excellent pigment wettability. When the consumption of the itaconic acid ester modified epoxidized soybean oil is less, the flexing resistance of the ink film is difficult to meet the requirement that the flexing resistance is more than 3 ten thousand times, but when the consumption is too much, the wear resistance of the ink film is reduced, so the consumption is preferably 5-12%.
The chlorinated polydimethylsiloxane is easy to be cracked by light due to the C-Cl bond, so that the photosensitivity of the system can be improved, and the curing and shaping of the ink film are accelerated. The epoxy soybean oil can absorb HCl generated by photo-cracking of the chlorinated polydimethylsiloxane, and the chlorinated polydimethylsiloxane and the itaconate modified epoxy soybean oil are shared, so that the ink film can be prevented from being degraded under the action of the HCl. In addition, the use of the chlorinated polydimethylsiloxane can improve the water resistance and the flexibility of the ink film, and can also enhance the wear resistance and the barrier property to the plasticizer. When the addition amount of the chlorinated polydimethylsiloxane is less than 2%, the barrier effect on the plasticizer is limited, the surface of the ink film is still sticky after aging, and oily matters are separated out, but when the addition amount is too large, HCl generated by cracking is more, more epoxy groups are consumed, the crosslinking degree is reduced, and the performance of the ink film is influenced.
According to the invention, by preferably selecting the mixture ratio of the urethane acrylate oligomer, the itaconate modified epoxidized soybean oil, the chlorinated polydimethylsiloxane, the free radical reactive diluent, the cationic photosensitive monomer, the nano pigment color paste, the photoinitiator and the auxiliary agent, the obtained ink has good adhesion fastness on PVC leather, clear printed patterns, good flexibility resistance and enough wear resistance.
Preferably, the free radical reactive diluent is at least one of isobornyl methacrylate, tetrahydrofuryl methacrylate, decyl acrylate, ethoxyethoxyethyl acrylate, 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, neopentyl glycol diethoxy diacrylate and trimethylolpropane triacrylate. The itaconic ester modified epoxidized soybean oil has a plurality of reaction functional groups, high crosslinking degree and high curing speed, so that more low-functionality monomers can be selected as the free radical reactive diluent, the viscosity of a system is favorably reduced, and the curing shrinkage of an ink film is reduced.
Preferably, the cationic photosensitive monomer is at least one of a vinyl ether reactive diluent, an ethylene oxide reactive diluent and an oxetane reactive diluent.
Preferably, the photoinitiator comprises a radical photoinitiator and a cationic photoinitiator, wherein the radical photoinitiator is at least one of benzoin dimethyl ether, alpha-hydroxycyclohexyl benzophenone, isopropyl thioxanthone, 2 (4-methylthiobenzoyl) -2-morpholinopropane, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinobenzyl phenyl) butanone, 2,4, 6-trimethylbenzoyl diphenylphosphine oxide and bis (2,4, 6-trimethylbenzoyl) phenylphosphine oxide; the cationic photoinitiator is at least one of ferrocenium salt, diaryl iodonium salt and triaryl sulfonium salt.
Preferably, the auxiliary agent includes at least one of a leveling agent, a wetting agent, and a defoaming agent.
The invention also provides a preparation method of the UV-LED inkjet ink for PVC leather printing, which comprises the steps of mixing the polyurethane acrylate oligomer, the itaconate modified epoxidized soybean oil, the chlorinated polydimethylsiloxane, the free radical reactive diluent, the cationic photosensitive monomer, the nano pigment color paste, the photoinitiator and the auxiliary agent, and uniformly stirring.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, itaconic anhydride, hydroxyl acrylate and epoxy soybean oil are adopted to react to generate itaconic ester modified epoxy soybean oil containing acrylate double bonds and epoxy groups, the itaconic ester modified epoxy soybean oil is used for UV-LED ink-jet ink, under the irradiation of UV-LED, the double bonds are rapidly cured to form a network structure, so that an ink film is preliminarily shaped, the flow diffusion of the ink is reduced, and the pattern definition is improved; the epoxy group realizes post-curing through cationic reaction, and avoids wrinkling, cracking or adhesion reduction and the like of an ink film caused by too fast curing of the ink.
(2) The cured film of the itaconate modified epoxy soybean oil has strong adhesive force, and compared with epoxy resin, the segment has better flexibility, and the ink film can be toughened by crosslinking and shared with urethane acrylate oligomer, so that the flexibility resistance of the ink film is improved.
(3) The use of the chlorinated polydimethylsiloxane can improve the flexibility and the wear resistance of the ink film, and the C-Cl bond of the chlorinated polydimethylsiloxane is easy to be photo-cracked, so that the photosensitivity of the system can be improved; and the epoxidized soybean oil can absorb HCl generated by photocracking of the chlorinated polydimethylsiloxane, so that the ink film is prevented from being degraded under the action of the HCl.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It should be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the examples, the experimental methods used were all conventional methods unless otherwise specified, and the materials, reagents and the like used were commercially available without otherwise specified.
Preparation of (I) itaconate modified epoxidized soybean oil
The synthetic formula of the itaconate modified epoxidized soybean oil of the present example is shown in table 1, and the preparation method of the itaconate modified epoxidized soybean oil specifically includes the following steps:
s1, placing itaconic anhydride, hydroxyl acrylate, p-hydroxyanisole and N-dimethylaminopyridine in a reaction kettle, adding 30-40 g of toluene to dissolve, introducing nitrogen, and heating to 80 ℃ to react for 5-6 hours; after the reaction is finished, washing the product solution by using a 0.1M hydrochloric acid aqueous solution, and removing toluene by using a rotary evaporator in a solvent phase to obtain itaconic acid monoester;
s2, adding epoxidized soybean oil, itaconic acid monoester, triphenylphosphine and toluene into a reaction kettle, reacting for 20 hours at 110 ℃, and using 1% NaHCO as a product3The aqueous solution was washed and the solvent phase was rotary evaporated to remove toluene using a rotary evaporator.
Caprolactone acrylate used in the examples was obtained from TONE M-201 from Shanghai Xuanyeng Fine chemistry Co., Ltd. Epoxidized soybean oil was purchased from Guangzhou Xing Cheng Shang trade Co., Ltd, respectively, and had an epoxy value of 6.6%; the epoxy value of Shandong Baolilai plastics auxiliary company is 6.0%. The chlorinated polydimethylsiloxane is alpha, omega-dichloro polydimethylsiloxane.
TABLE 1 Synthesis formulation of itaconate modified epoxidized soybean oil of this example
Preparation of (II) UV-LED ink-jet ink
The formulations (weight percentages) of the UV-LED inkjet inks of examples 1 to 4 and comparative examples 1 to 4 are shown in table 2, and the formulations of the UV-LED inkjet inks were prepared by: mixing the urethane acrylate oligomer, the itaconate modified epoxidized soybean oil, the chlorinated polydimethylsiloxane, the free radical reactive diluent, the cationic photosensitive monomer, the nano pigment color paste, the photoinitiator and the auxiliary agent, and stirring uniformly.
TABLE 2 formulation of UV-LED inkjet inks
(III) Performance testing and results
Viscosity: measuring the viscosity of the ink-jet ink at 25 ℃ according to the rotation method in GB/T10247-2008; appearance: observing the flatness and the pattern definition of the photocuring ink film; determining the adhesion fastness of the ink layer to the PVC leather substrate according to GB/T13217.7-2009; low-temperature flexing resistance: placing the sample on a QY-1 low-temperature flexometer, and testing the deflection times of the ink film when the ink film cracks at-20 ℃; wear resistance: testing the rubbing resistant times of the ink film under the load of 4 pounds by adopting an NMC-II type wear resistance instrument; aging resistance: the ink film is placed at 60 +/-3 ℃ and the irradiance is 0.68W/m2Under the conditions, the ink film was exposed to continuous light for 7 days, and changes in appearance, adhesion, and abrasion resistance were observed in comparison with the unaged ink film.
TABLE 3 Performance test results of UV-LED inkjet inks of examples 1-4
TABLE 4 Performance test results of UV-LED inkjet inks of comparative examples 1-4
As can be seen from table 3, the photo-curing ink film of the UV-LED inkjet ink in examples 1 to 4 has a smooth surface and a clear pattern, the adhesion fastness to PVC leather reaches 100%, the number of times of flexing resistance is greater than 3 ten thousand, the number of times of wear resistance is greater than 200, and after aging for 7 days, the appearance and performance do not change much, which meets the use requirements of the inkjet ink for PVC leather.
As can be seen from comparative example 1 and example 1, when the molar number of itaconic anhydride: hydroxyl acrylate molar number: when the ratio of the number of moles of the epoxy groups in the epoxidized soybean oil is 1:1:1, the photo-cured ink film is uneven and slightly wrinkled, and the flexing resistance and the wear resistance are obviously reduced, because the synthetic itaconic ester modified epoxidized soybean oil is basically free of epoxy groups, so that the ink film is wrinkled due to too high curing speed, and the flexing resistance and the wear resistance are reduced.
As can be seen from comparative example 2 and example 4, when the molar number of itaconic anhydride: hydroxyl acrylate molar number: when the ratio of the number of moles of the epoxy groups in the epoxidized soybean oil is 1:1:5, the pattern edge is not clear, and the wear resistance is poor, because the epoxy group content is too high, part of the epoxidized soybean oil is not modified by itaconate, so that the primary curing of the ink is slow, the pattern edge is weakened, the ink film is incompletely cured, and the wear resistance is reduced.
As can be seen from comparative example 3 and example 3, when the urethane acrylate oligomer is used in place of the itaconate-modified epoxidized soybean oil in the ink formulation, the pattern is unclear, the flexing resistance is poor, the color becomes lighter after aging, and the abrasion resistance becomes poor because the flexibility of the ink film is reduced and the viscosity of the ink is higher when the itaconate-modified epoxidized soybean oil is not added, so that the printed ink drop is deformed and the pattern is unclear; in addition, HCl produced by cracking chlorinated polydimethylsiloxane degrades the ink film during aging, resulting in color change and poor wear resistance.
As can be seen from comparative example 4 and example 3, when the chlorinated polydimethylsiloxane was not added to the ink formulation, the abrasion resistance of the ink film was significantly reduced, and the ink film was tacky after aging, because the barrier property of the ink film was deteriorated and the plasticizer in the leather was precipitated to cause the ink film to be tacky without the chlorinated polydimethylsiloxane.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The UV-LED ink-jet ink for PVC leather printing is characterized by comprising the following components in percentage by weight:
the itaconate modified epoxidized soybean oil is prepared from components including itaconic anhydride, hydroxyl acrylate and epoxidized soybean oil.
2. The UV-LED inkjet ink for PVC leather printing according to claim 1, wherein the molar ratio of the itaconic anhydride to the hydroxyl acrylate to the epoxy groups in the epoxidized soybean oil is 1:1: 1.5-4.
3. The UV-LED inkjet ink for PVC leather printing according to claim 1, wherein the hydroxy acrylate is at least one of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxybutyl acrylate, hydroxybutyl methacrylate and caprolactone acrylate.
4. The UV-LED inkjet ink for PVC leather printing according to claim 1, wherein the preparation method of the itaconate modified epoxidized soybean oil comprises the following steps:
s1, placing itaconic anhydride, hydroxyl acrylate, a polymerization inhibitor and a catalyst in a reaction kettle, adding a solvent for dissolving, introducing nitrogen, heating for reaction, and purifying a product to obtain itaconic acid monoester;
s2, adding the itaconic acid monoester obtained in the step S1, epoxidized soybean oil, a catalyst and a solvent into a reaction kettle, heating for reaction, and purifying a product to obtain the itaconic acid ester modified epoxidized soybean oil.
5. The UV-LED inkjet ink for PVC leather printing according to claim 1, wherein the radical reactive diluent is at least one of isobornyl methacrylate, tetrahydrofuryl methacrylate, decyl acrylate, ethoxyethoxyethyl acrylate, 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, neopentyl glycol diethoxy diacrylate and trimethylolpropane triacrylate.
6. The UV-LED inkjet ink for PVC leather printing according to claim 1, wherein the cationic photosensitive monomer is at least one of vinyl ether reactive diluent, ethylene oxide reactive diluent and oxetane reactive diluent.
7. The UV-LED inkjet ink for PVC leather printing according to claim 1, wherein the photoinitiator comprises a radical photoinitiator and a cationic photoinitiator, and the radical photoinitiator is at least one of benzoin dimethyl ether, alpha-hydroxycyclohexyl benzophenone, isopropyl thioxanthone, 2 (4-methylthiobenzoyl) -2-morpholinopropane, 2-phenylbenzyl-2-dimethylamine-1- (4-morpholinobenzyl) butanone, 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide and bis (2,4, 6-trimethylbenzoyl) phenyl phosphine oxide; the cationic photoinitiator is at least one of ferrocenium salt, diaryl iodonium salt and triaryl sulfonium salt.
8. The UV-LED inkjet ink for PVC leather printing according to any one of claims 1 to 7, wherein the auxiliary agent comprises at least one of a leveling agent, a wetting agent and an antifoaming agent.
9. The preparation method of the UV-LED inkjet ink for PVC leather printing according to claim 8, wherein the urethane acrylate oligomer, the itaconate modified epoxidized soybean oil, the chlorinated polydimethylsiloxane, the free radical reactive diluent, the cationic photosensitive monomer, the nano pigment color paste, the photoinitiator and the auxiliary agent are mixed and stirred uniformly.
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