A UV-curable inkjet composition and its use method and application

Abstract

The present invention provides a UV-curable inkjet composition and a method and application thereof. The UV-curable inkjet composition comprises the following components by weight: 5-20 parts of polyester acrylic resin, 20-40 parts of a first acrylic monomer, 20-40 parts of a second acrylic monomer, 1-3 parts of an ultraviolet absorber, and 3-8 parts of a photoinitiator. The transparent UV-curable inkjet composition provided by the present invention not only has the advantages of fast curing speed and good weather resistance, but also has the characteristics of PCB laser engraving, so that high-precision PCB characters and patterns can be prepared.

Description

Technical Field

[0001] The invention belongs to the technical field of inkjet printing, and in particular relates to an ultraviolet curing inkjet composition and a use method and application thereof. Background Art

[0002] In recent years, with the growing demand for high-end products, the PCB industry is facing new ecological changes. It is imperative to gradually eliminate obsolete production capacity, upgrade new PCB manufacturing processes, and reduce pollutant emissions during the production process. The traditional screen printing process in the PCB industry will gradually be replaced by inkjet printing. The PCB character printing market has grown rapidly, becoming a new turning point in the evolution of the PCB industry.

[0003] As a contactless, pressure-free, plate-free and environmentally friendly inkjet technology, digital inkjet printing technology uses digital inkjet printing technology and processes to obtain character graphics, which can significantly improve the position accuracy of PCB character graphics, which is extremely beneficial to improving the quality of PCB boards and improving product qualification rates, and conforms to the concept of green environmental protection. Specifically, the main principle of inkjet printing PCB technology is to print computer-designed patterns or texts on the circuit board, and achieve instant curing through ultraviolet (UV) irradiation, thereby completing the production of specific patterns or characters. Compared with the traditional screen printing process, inkjet printing PCB technology can effectively save screen production and text baking processes, while production equipment and workshop floor space are greatly reduced, thereby increasing production capacity, reducing environmental pollution and reducing production costs. In addition, inkjet printing technology has higher precision than traditional screen printing technology. It can automatically adjust the size of the text graphics according to the different size changes of the circuit board, so that the size of the digital graphics to be printed is consistent with the actual size of the board being made, thus effectively solving the problems caused by size expansion and contraction.

[0004] At present, PCB inkjet printing technology still has shortcomings: for example, the resolution and accuracy of complex patterns are low, the weather resistance is poor, and the public transparent inkjet composition cannot achieve laser engraving.

[0005] Therefore, there is an urgent need to develop a PCB inkjet composition that is suitable for application fields with high weather resistance and high precision requirements. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a UV-curable inkjet composition and its use method and application. The transparent UV-curable inkjet composition provided by the present invention not only has the advantages of fast curing speed and good weather resistance, but also has the characteristics of PCB laser engraving, so that high-precision PCB characters and patterns can be prepared.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a UV-curable inkjet composition, wherein the UV-curable inkjet composition comprises the following components in parts by weight:

[0009]

[0010] The present invention selects a polyester acrylic resin with low viscosity, high adhesion and good weather resistance as the main component of the UV-curable inkjet composition, and combines a first acrylic monomer with fast curing ability and a soft second acrylic monomer to ensure that the UV-curable inkjet composition can meet the requirements of fast inkjet printing, good adhesion to PCB boards and high temperature resistance. In addition, the photoinitiator and the ultraviolet absorber in the UV-curable inkjet composition formula provided by the present invention have a synergistic effect, so that the UV-curable inkjet composition can absorb ultraviolet light with a wavelength of 395nm-405nm for curing, and can also completely absorb ultraviolet light with a wavelength of 355nm-365nm for 3D laser carving technology.

[0011] In summary, the present invention regulates the composition of the UV-curable inkjet composition so that it not only has excellent adhesion to the PCB board and good high temperature resistance, but also has laser engraving properties, thereby achieving high-precision and high-efficiency engraving effects of complex characters and patterns.

[0012] In the present invention, the weight percentage of the polyester acrylic resin is 5-20 parts, for example, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, etc. If the weight percentage of the polyester acrylic resin is low, the adhesion of the formed organic film layer will be reduced, and it will fall off in the cross-grid test; if the weight percentage of the polyester acrylic resin is high, the viscosity of the prepared UV-curable inkjet composition will be too high, resulting in poor ink discharge during inkjet printing and unclear and unsmooth patterns.

[0013] In the present invention, the weight percentage of the first acrylic monomer is 20-40 parts, for example, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, etc. If the weight percentage of the first acrylic monomer is low, the inkjet curing speed will be slow and the inkjet printed pattern will have poor shape retention; if the weight percentage of the first acrylic monomer is high, the organic thin film layer formed will shrink too much, resulting in reduced adhesion between the organic thin film layer and electronic devices, and falling off in the 100-grid test.

[0014] In the present invention, the weight percentage of the second acrylic monomer is 20-40 parts, for example, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, etc. If the weight percentage of the second acrylic monomer is low, the formed organic film layer will be brittle and cannot pass the cross-sectional test; if the weight percentage of the second acrylic monomer is high, the formed organic film layer will be too soft, and the curing speed will be reduced, and the laser engraving pattern will be unclear.

[0015] In the present invention, the weight proportion of the ultraviolet absorber is 1-3 parts, for example, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, etc.

[0016] In the present invention, the weight proportion of the photoinitiator is 3-8 parts, for example, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, etc.

[0017] Further preferably, the UV curable inkjet composition comprises the following components in parts by weight:

[0018]

[0019] Preferably, the polyester acrylic resin is selected from amine-modified polyester acrylate and / or carboxylic acid polyester acrylate.

[0020] Preferably, the weight average molecular weight of the polyester acrylic resin is 1000-3000, for example, 1000, 1200, 1500, 1800, 2000, 2200, 2500, 2800, 3000, etc. The present invention adjusts the weight average molecular weight of the polyester acrylic resin so that the viscosity of the formed organic film layer is moderate, and the adhesion with the electronic device is good, and the pattern after laser engraving is clear. If a polyester acrylic resin with a larger weight average molecular weight is used, the viscosity of the prepared ultraviolet curable inkjet composition will be too large, and the pattern will not be smooth and clear during printing, and the pattern will not be clear during laser engraving.

[0021] Preferably, the viscosity of the polyester acrylic resin is 100mPa·s-1000mPa·s, for example, 100mPa·s, 200mPa·s, 300mPa·s, 500mPa·s, 600mPa·s, 800mPa·s, 1000mPa·s, etc. The present invention adjusts the viscosity of the polyester acrylic resin so that the ink jet printing is smooth and the edges of the graphics are clear, while meeting the adhesion and laser engraving requirements of the organic film layer.

[0022] Preferably, the glass transition temperature of the polyester acrylic resin is 10°C-80°C, for example, 10°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, etc. The present invention adjusts the glass transition temperature of the polyester acrylic resin so that the hardness of the formed organic thin film layer is moderate, the layer can pass the hundred-grid test, and the laser engraving pattern is clear.

[0023] Preferably, the polyester acrylic resin is selected from any one of Double Bond Chemical 2015, Double Bond Chemical 270, Double Bond Chemical 281, Double Bond Chemical 285 or Double Bond Chemical 286, or a combination of at least two thereof.

[0024] Preferably, the first acrylic monomer is selected from any one of dipropylene glycol diacrylate, 1,6-hexanediol diacrylate, 2-phenoxyethyl acrylate or pentaerythritol triacrylate or a combination of at least two thereof, preferably any one of dipropylene glycol diacrylate, 1,6-hexanediol diacrylate or pentaerythritol triacrylate or a combination of at least two thereof.

[0025] In the present invention, by adjusting the first acrylic monomer to be an acrylic monomer with fast curing ability and excellent adhesion to the PCB board, the UV-curable inkjet composition has a fast curing speed, meets the high-speed printing requirements, and the maximum speed can be as high as 500 mm / s.

[0026] Preferably, the second acrylic monomer is a monofunctional cyclic structure monomer.

[0027] Preferably, the second acrylic monomer is selected from any one of tetrahydrofuran acrylate, 3,5,5-trimethylcyclohexyl acrylate, cyclotrimethylolpropane formal acrylate and 4-acryloylmorpholine, or a combination of at least two thereof.

[0028] In the present invention, the second acrylic monomer is adjusted to be an acrylic monomer having good flexibility and good adhesion to the PCB board, so that the UV-curable inkjet composition can avoid edge collapse during the 100-grid test.

[0029] Preferably, the ultraviolet absorber is selected from any one of BASF C81, BASF Tinuvin 234, BASF Tinuvin 622 or BASF Tinuvin B75, or a combination of at least two thereof.

[0030] Preferably, the photoinitiator is selected from any one of photoinitiator 184, photoinitiator TMO, photoinitiator BP, photoinitiator ITX, photoinitiator 819 or photoinitiator 1173, or a combination of at least two thereof.

[0031] Preferably, the mass ratio of the ultraviolet absorber to the photoinitiator is 1:(2-4), preferably 1:3, for example, it can be 1:2, 1:2.2, 1:2.5, 1:2.8, 1:3, 1:3.2, 1:3.5, 1:3.8, 1:4, etc. The present invention adjusts the mass ratio of the ultraviolet absorber to the photoinitiator so that the formed organic film layer meets the laser engraving performance requirements and can be quickly cured at a wavelength of 395nm-405nm. If the mass ratio of the ultraviolet absorber to the photoinitiator is relatively low, the laser engraving will not be clean and the pattern will not be clear; if the mass ratio of the ultraviolet absorber to the photoinitiator is relatively high, the curing speed of the formed organic film layer will be slow and the deep curing will be poor.

[0032] In the present invention, the photoinitiator and the ultraviolet light absorber have a synergistic effect, so that the ultraviolet curable inkjet composition can absorb ultraviolet light with a wavelength of 395nm-405nm for curing, and can also completely absorb ultraviolet light with a wavelength of 355nm-365nm for 3D laser engraving process.

[0033] Preferably, the UV curable inkjet composition further comprises, by weight, 1-3 parts of an auxiliary agent, for example, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, etc.

[0034] Preferably, the auxiliary agent includes a leveling agent and / or a defoaming agent.

[0035] In the present invention, the leveling agent exemplarily includes at least one of German BYK333 leveling agent, German BYK3455 leveling agent, German BYK9076 leveling agent or German BYK3505 leveling agent; the defoaming agent exemplarily includes at least one of German BYK022 defoaming agent, Deqian 6800 or Digao 920.

[0036] Preferably, the viscosity of the UV-curable inkjet composition is 20 mPa·s-30 mPa·s, for example, 20 mPa·s, 22 mPa·s, 25 mPa·s, 28 mPa·s, 30 mPa·s, etc.

[0037] Preferably, the surface tension of the UV-curable inkjet composition is 27 mN / m-30 mN / m, for example, 27 mN / m, 28 mN / m, 29 mN / m, 30 mN / m, etc.

[0038] Since the viscosity and surface tension of the UV-curable inkjet composition will affect the performance of the inkjet nozzle, ink drop shape and ink drop diffusion, the viscosity and surface tension of the UV-curable inkjet composition are regulated to make the edge of the inkjet printed pattern clear and the thickness distribution of the formed organic thin film layer uniform.

[0039] In a second aspect, the present invention provides a method for using the UV-curable inkjet composition according to the first aspect, the method comprising the following steps:

[0040] The ultraviolet curable inkjet composition according to the first aspect is coated on the surface of the electronic device by inkjet printing, and a curing reaction is carried out under ultraviolet light to form an organic thin film layer.

[0041] Preferably, the wavelength of the ultraviolet light is 395nm-405nm.

[0042] The ultraviolet curable inkjet composition provided by the present invention can not only absorb ultraviolet light with a wavelength of 395nm-405nm to perform a curing reaction, but can also completely absorb ultraviolet light with a wavelength of 355nm-365nm for use in a 3D laser engraving process.

[0043] In the present invention, the inkjet printing can exemplarily use a Konica nozzle for rapid printing photocuring, wherein the inkjet printing speed is 300mm / s-500mm / s, for example, 300mm / s, 320mm / s, 350mm / s, 380mm / s, 400mm / s, 420mm / s, 450mm / s, 480mm / s, 500mm / s, etc.

[0044] In a third aspect, the present invention provides an application of the UV-curable inkjet composition according to the first aspect, wherein the UV-curable inkjet composition is used in a PCB laser engraving process.

[0045] The ultraviolet curable inkjet composition provided by the invention has the property of being laser engraved on PCB, and the organic thin film layer formed by inkjet printing can be laser engraved with any characters and patterns.

[0046] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] The present invention provides a UV-curable inkjet composition, which selects a polyester acrylic resin with low viscosity, high adhesion and good weather resistance as the main component of the UV-curable inkjet composition, and combines a first acrylic monomer with fast curing ability and a soft second acrylic monomer to ensure that the UV-curable inkjet composition can meet the requirements of fast inkjet printing, good adhesion to PCB boards and high temperature resistance. In addition, the photoinitiator and the ultraviolet absorber in the formula of the UV-curable inkjet composition provided by the present invention have a synergistic effect, so that the UV-curable inkjet composition can absorb ultraviolet light with a wavelength of 395nm-405nm for curing, and can also completely absorb ultraviolet light with a wavelength of 355nm-365nm for 3D laser carving process.

[0049] In summary, the present invention regulates the composition of the UV-curable inkjet composition so that it not only has excellent adhesion to the PCB board and good high temperature resistance, but also has laser engraving properties, thereby achieving high-precision and high-efficiency engraving effects of complex characters and patterns. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0051] Example 1

[0052] This embodiment provides a UV-curable inkjet composition having a viscosity of 24 mPa·s and a surface tension of 28 mN / m, which comprises the following components in parts by weight:

[0053]

[0054] The high-functionality polyester acrylate was purchased from Double Bond Chemical Co., Ltd., with a model of DM 2015, a weight-average molecular weight of 1500, a viscosity of 300 mPa·s, and a glass transition temperature of 70°C.

[0055] This embodiment provides a method for preparing the above-mentioned UV-curable inkjet composition, which comprises the following steps:

[0056] High-functionality polyester acrylate, dipropylene glycol diacrylate, tetrahydrofuran acrylate, BASF C81 ultraviolet absorber, photoinitiator 184 and BYK333 leveling agent are mixed and dispersed according to the formula amount, and the ultraviolet curing inkjet composition is obtained after degassing.

[0057] Example 2

[0058] This embodiment provides a UV-curable inkjet composition having a viscosity of 20 mPa·s and a surface tension of 27 mN / m, which comprises the following components in parts by weight:

[0059]

[0060] The high-functionality polyester acrylate was purchased from Double Bond Chemical Co., Ltd., with a model of DM 2015, a weight-average molecular weight of 1500, a viscosity of 300 mPa·s, and a glass transition temperature of 70°C.

[0061] The preparation method of the UV-curable inkjet composition in this embodiment is the same as that in Embodiment 1.

[0062] Example 3

[0063] This embodiment provides a UV-curable inkjet composition having a viscosity of 30 mPa·s and a surface tension of 30 mN / m, which comprises the following components in parts by weight:

[0064]

[0065]

[0066] The high-functionality polyester acrylate was purchased from Double Bond Chemical Co., Ltd., with a model of DM 2015, a weight-average molecular weight of 1500, a viscosity of 300 mPa·s, and a glass transition temperature of 70°C.

[0067] The preparation method of the UV-curable inkjet composition in this embodiment is the same as that in Embodiment 1.

[0068] Example 4

[0069] The difference between this embodiment and embodiment 1 is that BYK333 leveling agent is not added, and the other aspects are the same as those of embodiment 1.

[0070] Example 5

[0071] The difference between this embodiment and embodiment 1 is that the high-functionality polyester acrylate is replaced with an equal weight portion of high-functionality polyester acrylate with a viscosity of 80 mPa·s, and the rest is the same as embodiment 1.

[0072] Example 6

[0073] The difference between this embodiment and embodiment 1 is that the high-functionality polyester acrylate is replaced with an equal weight portion of high-functionality polyester acrylate with a viscosity of 2000 mPa·s, and the rest is the same as embodiment 1.

[0074] Example 7

[0075] The difference between this embodiment and embodiment 1 is that the high-functionality polyester acrylate is replaced with an equal weight portion of high-functionality polyester acrylate having a glass transition temperature of 5° C., and the rest is the same as embodiment 1.

[0076] Example 8

[0077] The difference between this embodiment and embodiment 1 is that the high-functionality polyester acrylate is replaced with an equal weight portion of high-functionality polyester acrylate having a glass transition temperature of 90° C., and the rest is the same as embodiment 1.

[0078] Example 9

[0079] The difference between this embodiment and embodiment 1 is that dipropylene glycol diacrylate is replaced by hydroxyethyl methacrylate in equal parts by weight, and the rest is the same as embodiment 1.

[0080] Example 10

[0081] The difference between this embodiment and embodiment 1 is that tetrahydrofuran acrylate is replaced by 4-acryloylmorpholine in equal parts by weight, and the rest is the same as embodiment 1.

[0082] Embodiment 11

[0083] The difference between this embodiment and embodiment 1 is that the mass ratio of BASF C81 ultraviolet absorber to photoinitiator 184 is 1:1, and the rest is the same as embodiment 1.

[0084] Example 12

[0085] The difference between this embodiment and embodiment 1 is that the mass ratio of BASF C81 ultraviolet absorber to photoinitiator 184 is 1:5, and the rest is the same as embodiment 1.

[0086] Comparative Example 1

[0087] The difference between this comparative example and Example 1 is that the weight portion of the high-functionality polyester acrylate is adjusted to 40 parts, and the rest is the same as Example 1.

[0088] Comparative Example 2

[0089] The difference between this comparative example and Example 1 is that the weight portion of dipropylene glycol diacrylate is adjusted to 10 parts, and the other parts are the same as Example 1.

[0090] Comparative Example 3

[0091] The difference between this comparative example and Example 1 is that the weight portion of tetrahydrofuran acrylate is adjusted to 10 parts, and the rest is the same as Example 1.

[0092] Comparative Example 4

[0093] The difference between this comparative example and Example 1 is that the BASF C81 ultraviolet absorber is replaced by an equal amount of photoinitiator 184, and the rest is the same as Example 1.

[0094] Test conditions

[0095] The UV-curable inkjet compositions provided in Examples 1 to 12 and Comparative Examples 1 to 4 were subjected to performance tests, and the test conditions are as follows:

[0096] (1) Viscosity: measured using an E-type viscometer (RE100L viscometer, manufactured by Toki Sangyo Co., Ltd.) at a temperature of 25° C. and a rotor speed of 20 rpm;

[0097] (2) Surface tension: Measured at a temperature of 25° C. using a dynamic wettability tester (WET-6000, manufactured by Lesca Corporation).

[0098] The UV-curable inkjet compositions provided in Examples 1 to 12 and Comparative Examples 1 to 4 were inkjet printed on a PCB board using a Konica nozzle at a printing speed of 400 mm / s, and irradiated under ultraviolet light with a wavelength of 405 nm to obtain an organic thin film layer, and the organic thin film layer was laser engraved to obtain a PCB pattern to test the precision of inkjet printing.

[0099] The test results are shown in Table 1:

[0100] Table 1

[0101]

[0102]

[0103] As can be seen from Table 1, the present invention regulates the types and weight fractions of each component in the UV-curable inkjet composition to maintain its viscosity within the range of 20 mPa·s-30 mPa·s, thereby ensuring smooth dispensing during inkjet printing. In addition, the present invention also requires regulating the surface tension of the UV-curable inkjet composition within the range of 27 mN / m-30 mN / m, so that the pattern obtained by inkjet printing is clearer.

[0104] Examples 5 to 10 show that the present invention optimizes the types and physical properties of polyester acrylate resin and two acrylic monomers, so that the prepared organic thin film layer has good adhesion to the electronic device. Examples 11 and 12 show that the present invention optimizes the mass ratio between the ultraviolet absorber and the photoinitiator, so that the ultraviolet curable inkjet composition can be quickly cured and the laser engraved pattern remains clear.

[0105] Compared with Example 1, Comparative Examples 1 to 3 show that the present invention optimizes the weight proportions of the polyester acrylic resin and the two acrylic monomers so that the prepared UV-curable inkjet composition has a suitable viscosity and a fast curing speed, thereby ensuring smooth ink discharge during the inkjet printing process and maintaining a clear pattern.

[0106] Compared with Example 1, Comparative Example 4 shows that there is a synergistic effect between the ultraviolet absorber and the photoinitiator, so that the formed organic thin film layer can be quickly cured at a wavelength of 395nm-405nm while ensuring that the formed organic thin film layer meets the requirements of laser engraving performance.

[0107] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A UV-curable inkjet composition, characterized in that: The UV-curable inkjet composition comprises the following components in parts by weight:

2. The UV-curable inkjet composition according to claim 1, characterized in that The UV-curable inkjet composition comprises the following components in parts by weight:

3. The UV-curable inkjet composition according to claim 1 or 2, characterized in that: The polyester acrylic resin is selected from amine-modified polyester acrylate and / or carboxylic acid polyester acrylate; Preferably, the weight average molecular weight of the polyester acrylic resin is 1000-3000; Preferably, the viscosity of the polyester acrylic resin is 100 mPa·s-1000 mPa·s; Preferably, the glass transition temperature of the polyester acrylic resin is 10°C-80°C; Preferably, the polyester acrylic resin is selected from any one of Double Bond Chemical 2015, Double Bond Chemical 270, Double Bond Chemical 281, Double Bond Chemical 285 or Double Bond Chemical 286, or a combination of at least two thereof.

4. The UV-curable inkjet composition according to any one of claims 1 to 3, characterized in that: The first acrylic monomer is selected from any one of dipropylene glycol diacrylate, 1,6 hexanediol diacrylate, 2-phenoxyethyl acrylate or pentaerythritol triacrylate or a combination of at least two thereof, preferably any one of dipropylene glycol diacrylate, 1,6 hexanediol diacrylate or pentaerythritol triacrylate or a combination of at least two thereof.

5. The UV-curable inkjet composition according to any one of claims 1 to 4, characterized in that: The second acrylic monomer is a monofunctional cyclic structure monomer; Preferably, the second acrylic monomer is selected from any one of tetrahydrofuran acrylate, 3,5,5-trimethylcyclohexyl acrylate, cyclotrimethylolpropane formal acrylate and 4-acryloylmorpholine, or a combination of at least two thereof.

6. The UV-curable inkjet composition according to any one of claims 1 to 5, characterized in that: The ultraviolet absorber is selected from any one of BASF C81, BASF Tinuvin 234, BASF Tinuvin 622 or BASF Tinuvin B75, or a combination of at least two thereof; Preferably, the photoinitiator is selected from any one or a combination of at least two of photoinitiator 184, photoinitiator TMO, photoinitiator BP, photoinitiator ITX, photoinitiator 819 or photoinitiator 1173; Preferably, the mass ratio of the ultraviolet absorber to the photoinitiator is 1:(2-4), preferably 1:

3.

7. The UV-curable inkjet composition according to any one of claims 1 to 6, characterized in that: In terms of parts by weight, the UV-curable inkjet composition further comprises: 1-3 parts of an auxiliary agent; Preferably, the auxiliary agent includes a leveling agent and / or a defoaming agent; Preferably, the viscosity of the UV-curable inkjet composition is 20 mPa·s-30 mPa·s; Preferably, the surface tension of the UV-curable inkjet composition is 27 mN / m-30 mN / m.

8. A method of using the UV-curable inkjet composition according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: The ultraviolet curable inkjet composition according to any one of claims 1 to 7 is coated on the surface of the electronic device by inkjet printing, and a curing reaction is carried out under ultraviolet light to form an organic thin film layer.

9. The method according to claim 8, characterized in that The wavelength of the ultraviolet light is 395nm-405nm.

10. A use of the UV curable inkjet composition according to any one of claims 1 to 7, characterized in that: The ultraviolet curable inkjet composition is used in PCB laser engraving process.

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