CN113248972A - Reflective film UV curing inkjet ink and preparation method and application thereof - Google Patents

Abstract

The invention discloses reflective film UV curing ink-jet ink and a preparation method and application thereof. The ink is prepared from the following raw materials in parts by weight: 2-5 parts of organic pigment, 1-3 parts of dispersant, 1-10 parts of acrylic resin, 10-20 parts of UV oligomer, 60-90 parts of UV monomer, 5-15 parts of photoinitiator and 0.1-2 parts of light stabilizer. The reflective film UV curing ink-jet ink prepared by the invention has the advantages of good weather resistance, high adhesion with a reflective film, good gloss effect and the like. The reflective film is used for forming the reflective film by digital painting, so that the inventory is extremely less, only the white reflective film and a small amount of spot color reflective film are reserved, the pattern construction is simple, the spot color reflective film is convenient to use, the yield of products is greatly improved, and the manufacturing cost is reduced.

Description

Reflective film UV curing inkjet ink and preparation method and application thereof

Technical Field

The invention belongs to the field of reflective films, and particularly relates to reflective film UV curing ink-jet ink as well as a preparation method and application thereof.

Background

The reflective film material is mainly applied to two categories of road traffic signs and non-road traffic signs, which are hereinafter referred to as reflective signs for short, and the reflective signs have the characteristic of retroreflection, so that the reflective signs have a visual function when light shines at night, and have the functions of warning and marking; for example, when a traffic road user (vehicle, driver, pedestrian) passes through the type of sign board, the outline of the reflective sign board can be clearly seen, if an object (vehicle, pedestrian) passes through the reflective sign board, the reflected light is shielded, so that the black outline of the object is displayed, and the traffic road user (vehicle, driver, pedestrian) can more easily distinguish the class of the object, thereby playing a role of warning; therefore, the sign plate made of the reflective film material can improve the safety performance of traffic facilities, and the equipment facilities of the power system can also improve the warning performance.

However, the traditional reflective sign plate mostly adopts a lettering process, namely, films with different colors are carved into required patterns, characters and the like, and then the patterns are laminated in multiple layers to realize pattern expression.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides reflective film UV curing ink-jet ink, which specifically adopts the following technical scheme:

the reflective film UV curing ink-jet ink comprises the following raw materials in parts by weight: 2-5 parts of organic pigment, 1-3 parts of dispersant, 1-10 parts of acrylic resin, 10-20 parts of UV oligomer, 60-90 parts of UV monomer, 5-15 parts of photoinitiator and 0.1-2 parts of light stabilizer;

the dispersing agent is a controllable polymerized AB block acrylic copolymer with pigment-philic groups; the UV oligomer comprises a first oligomer and/or a second oligomer, and the first UV oligomer is aliphatic polyurethane; the second UV oligomer is etherified polyester;

the UV monomer comprises a first UV monomer and at least one of a second UV monomer and a third UV monomer, and the first UV monomer comprises at least 3 monofunctional UV monomers; the second UV monomer is a bifunctional UV monomer; the third UV monomer is a multifunctional UV monomer;

the photoinitiator comprises a first photoinitiator and at least one of a second photoinitiator, a third photoinitiator and a fourth photoinitiator; the first photoinitiator is one of 2,4, 6-trimethylbenzoyl-diphenyl phosphorus oxide (TPO), 2,4, 6-trimethylbenzoyl ethyl phosphate (TPO-L) and phenyl bis (2,4, 6-trimethylbenzoyl) phosphorus oxide (the commercial model is 819); the second photoinitiator is one of 2-methyl-2 (4-morpholinyl) -1- (4- (methylthio) -phenyl) -1-acetone (the commodity model is 907), 1-hydroxy-cyclohexyl-phenyl ketone (the commodity model is 184) and 2-hydroxy-methylphenyl propane-1-ketone (the commodity model is 1173); the third photoinitiator is 2-isopropyl thioxanthone (the commodity model is ITX) or 2, 4-diethyl thioxanthone (the commodity model is DETX); the fourth photoinitiator is one of 2-benzyl-2-dimethylamino-1- (4-morpholinylphenyl) -1-butanone (the commodity model is 369), 2- (4-methylamino) -2-dimethylamino-1- (4-morpholinylphenyl) -1-butanone (the commodity model is 379) and 1- (4- (2-hydroxyethoxy) phenyl) -2-hydroxy-2-methyl-amino-1-acetone (the commodity model is 2959). The above commercial products were obtained from BASF, Germany.

The light stabilizer is a hindered amine light stabilizer, preferably one of TINUVIN123, TINUVIN144, TINUVIN292 and TINUVIN 5100. The above are all commercial models, available from BASF, germany.

The dispersant type defined by the invention has excellent pigment dispersing effect, can anchor pigment to form a firm and stable single pigment particle group structure, can form a tree-shaped spinous process by using a block structure at the other end of the dispersant, can effectively prevent other pigment groups from approaching to form steric hindrance, can prevent fine pigment particles from re-agglomerating to prevent nano color paste from flocculating, and meanwhile, the pigment affinity group can easily wet the surface of the organic pigment to reduce the viscosity of a system and provide good dispersibility, so that the viscosity of the system is reduced and excellent gloss is provided.

The acrylic resin has high refractivity, and carboxyl in the acrylic resin can participate in a crosslinking reaction in the reflective film, so that the luster of the ink and the adhesion to the reflective film can be improved, and one of German winning and developing DEGALAN P24, DEGALAN LP65/11, DEGALAN LP62/05, DEGALAN LP66/02, DEGALAN LP64/11, DEGALAN P26, DE GALAN VP67/11 and DEGALAN LP53/13C can be selected; the first oligomer has high curing speed, is beneficial to improving the gloss and weather resistance of the ink, has small shrinkage rate of the second oligomer, and is beneficial to enhancing the flexibility of the ink and the adhesive force to a reflective film; first UV monomer is monofunctional UV monomer, has low viscosity, and dilutability is good and characteristics such as low shrinkage factor, and the viscosity reduction speed can further be improved to compound the use, and second UV monomer is bifunctional UV monomer, can strengthen the wettability of pigment, improves curing speed, and the third UV monomer is polyfunctional UV monomer, can further improve curing speed, strengthens the cross-linking degree simultaneously, improves alcohol resistance.

The first photoinitiator has the characteristics of low odor and further improvement of curing speed, the second photoinitiator and the third photoinitiator are respectively used for strengthening deep layer curing and surface curing, and the fourth photoinitiator has the characteristic of yellowing resistance.

The organic pigment adopted by the invention comprises yellow, orange, red, purple, blue, green, brown and black, wherein the yellow organic pigment is PY93 or PY 110; the orange organic pigment is one of P061, P064 and P071; the red organic pigment is one or two of PR254 and PR 264; the purple organic pigment is one or two of PR202, QA MAGENTA D4545 and PV 37; the blue organic pigment is one or two of PB60, PB15:6, PB15:4 and PB15: 3; the green organic pigment is PG 7; the brown organic pigment is PBr 23; the black organic pigment is BK 7.

The color reflective film UV curing ink-jet ink prepared by the formula has good adhesive force on a PC/PMMA base plane material of the reflective film, and forms excellent compatibility with a PC/PMMA material in a perfect fit manner, and acrylic resin in the color ink-jet ink can be further cured and reacted with PC/PMMA on the surface layer of the reflective film to form an integrated ink layer, so that the color ink layer with the same effective life cycle as the reflective film is realized.

Preferably, the raw materials of the reflective film UV curing ink-jet ink further comprise 0.1-2 parts by weight of a first ultraviolet absorber and 0.1-2 parts by weight of a second ultraviolet absorber, wherein the first ultraviolet absorber is a triazine ultraviolet absorber; the second ultraviolet absorber is a benzotriazole ultraviolet absorber; the first ultraviolet light absorber and the second ultraviolet light absorber can respectively shield and absorb long-wave ultraviolet light (UVA 320-320 nm) and short-wave ultraviolet light (UVB 290-320nm), the light stabilizer can capture free radicals to inhibit local free radical reaction caused by the ultraviolet light, and the matching use of the photoinitiator and the ultraviolet light absorber can slow the fading, discoloration, light loss, cracks, bubbles and other conditions of the ink, thereby prolonging the weather resistance of the ink.

Preferably, the first ultraviolet light absorber is one of TINUVIN400 (abbreviated as T400), TINUVIN405, TINUVIN477 and TINUVIN 479; the second ultraviolet absorber is one of TINUVIN328, TINUVIN900, TINUVIN928 and TINUVIN1130 (abbreviated as T1130). The above are all commercial models, available from BASF, germany.

Preferably, the raw materials of the reflective film UV curing ink-jet ink further comprise 0.1-2 parts by weight of surfactant; the surfactant can control and adjust the surface tension so that the ink is more smooth and smoother.

Preferably, the surfactant is one of BYK-3500, BYK-3505, BYK-3510, BYK-3570, BYK-377, BYK-378 and BYK-3760. All the above are commercial models, purchased from BYK company of Germany.

Preferably, the dispersant is at least one of PX4310, PX4340, PX4700, PX4701, PX4730, PX4731, and PX 4732. The above models were all purchased from BASF, germany.

Preferably, the first UV oligomer is at least one of 6101, DR-U161, DR-U163, 6106 and 6112-100; the second UV oligomer is at least one of 6420, DR-E661, 63380, and 63425. All of the above models were purchased from chang corporation.

Preferably, the first UV monomer is at least three of isobornyl acrylate (IBOA), 2-phenoxyethyl acrylate (PHEA), tetrahydrofuran acrylate (TFHA), ethoxyethoxyethyl acrylate (EOEOEA), cyclotrimethylolpropane methacrylate (CTFA), Acryloylmorpholine (ACMO), Dimethylacrylamide (DMAA), Hydroxyethylacrylamide (HEAA), Hydroxyethylmethacrylate (HEMA), Diethylacrylamide (DEAA), and vinylpyrrolidone (NVP); the second UV monomer is one or two of 1, 6-hexanediol diacrylate (HDDA), tripropylene glycol diacrylate (TPGDA), (propoxylated) neopentyl glycol diacrylate (NPGD2PODA2) and dipropylene glycol diacrylate (DPGDA); the third UV monomer is one of dipentaerythritol hexaacrylate (DPHA), trimethylolpropane triacrylate (TMP TA) and ethoxytrimethylolpropane triacrylate (TMP3 EOTA).

Preferably, the acrylic resin is solid granular powder, the glass transition temperature Tg is 45-85 ℃, the acid value is 1-9KOH/g, the molecular weight is 5000-180000, and the solid content is more than 99.5%.

The invention also provides a preparation method of the reflective film UV curing ink-jet ink, wherein when the number of the UV monomers is more than 4, the preparation method comprises the following steps: mixing CO1 nano color paste, MT1 connecting material pre-solution and the rest UV monomer, stirring for 20-30min at the rotating speed of 8-10m/s, then keeping the rotating speed, sequentially adding IO1 photoinitiator pre-solution and IO2 pre-solution, continuously stirring for 20-30min, and filtering to obtain the reflective film UV curing inkjet ink; the remaining UV monomers are the UV monomers other than UV monomer A, UV monomer B, UV monomer C and UV monomer D;

when the UV monomers are equal to 4, the preparation method comprises the steps of: mixing CO1 nanometer color paste and MT1 connecting material pre-solution, stirring for 20-30min at the rotating speed of 8-10m/s, then keeping the rotating speed, sequentially adding IO1 photoinitiator pre-solution and IO2 pre-solution, continuously stirring for 20-30min, and filtering to obtain the reflective film UV curing inkjet ink;

the CO1 nanometer color paste is obtained according to the following steps: mixing the UV monomer A and a dispersing agent, stirring for 10-20min at the rotating speed of 3-6m/s, adding the organic pigment, adjusting the rotating speed to 8-10m/s, continuing stirring for 30-60min, and then grinding to obtain the CO1 nano color paste;

the MT1 vehicle pre-solution was obtained according to the following steps: placing the UV monomer B at the rotating speed of 3-4m/s for stirring, simultaneously adding acrylic resin, adjusting the rotating speed to 11-13m/s after the addition is finished, and continuously stirring for 120-150min to obtain the MT1 connecting material pre-solution;

the IO1 photoinitiator pre-solution was obtained according to the following steps: mixing the photoinitiator with the UV monomer C, and stirring at the rotating speed of 8-10m/s for 30-60min to obtain an IO1 photoinitiator pre-solution;

the IO2 pre-solution was obtained according to the following steps: mixing the light stabilizer and the UV monomer D, and stirring at the rotating speed of 8-10m/s for 30-60min to obtain the IO2 pre-solution;

the UV monomer A, the UV monomer B, the UV monomer C and the UV monomer D are respectively one of the UV monomers; the above processes are all carried out under the condition of keeping out light.

Wherein, in the process of preparing the MT1 connecting material pre-solution, the temperature is kept below 50, and the temperature is too high, which can cause the thermal polymerization of partial monomers; during the process of preparing the CO1 nanometer color paste, the temperature is kept lower than 50 ℃, and the mixture is ground to D₅₀The grain diameter is not more than 180nm, 0.2mm 95% yttrium stabilized zirconia beads are recommended to be adopted for double-cylinder single-cycle grinding during grinding, namely, grinding is carried out for 20-40 times from the cylinder A to the cylinder B and then from the cylinder B to the cylinder A, and Shenzhen sanxing vertical type, all-ceramic, turbine, pin, centrifugal type and non-screen nanometer grinding machine (the rotor is 95% zirconia, the stator is 95% zirconia, and the inner wall of the cylinder is silicon carbide) can be adopted; in the preparation of the IO1 photoinitiator pre-solution and IO2 pre-solution, the temperature was kept below 35 ℃.

In the preparation process of the reflective film UV curing ink-jet ink, firstly adjusting viscosity, color concentration and surface tension, and finally filtering to obtain the reflective film UV curing ink-jet ink; the preparation method comprises the following steps of adopting a melt-blown PP mixed glass fiber microporous filter core of Hangzhou Kongte, carrying out four-stage filtration of 5 mu m, 3 mu m, 1 mu m and 0.5 mu m, and filling the obtained reflective film UV curing ink-jet ink into a black opaque bottle for storage.

The final reflective film UV curing ink-jet ink has the Brookfield viscosity of 15-25mPa.s centipoise at 25 ℃, the surface tension of 28-45mN/m dyne and the particle size D₅₀Less than or equal to 180nm nanometer.

The reflective film UV curing ink-jet ink can be applied to reflective film spray painting. The reflective film UV curing ink-jet ink is adopted to directly spray printed digital patterns on a white reflective film and then is covered with a protective film, so that one-step forming is realized.

The reflective film UV curing inkjet ink for reflective film spray painting comprises the following steps:

and (2) loading a reflective film on UV (ultraviolet) spray painting equipment, loading the UV curing ink-jet ink of the reflective film into a printing head, setting a pattern to be output on a computer, setting the distance between the reflective film and the printing head to be 2-3mm, sending the pattern to a printer, and printing the pattern.

Wherein, a UV digital inkjet printer of Toshiba CE4 (resolution over 600 × 1200dpi) can be used as UV inkjet printing equipment, RIP Sharp software is used for converting patterns in a computer into codes which can be recognized by the inkjet printer and sending the codes to a printer for printing; during spray painting, the temperature of the printing head is heated to 35-45 ℃, and a 600x1200dpi 3/4/6pass and feathering mode is adopted; finally, the printed finished product is free from ink misting, ink bleeding, ink feathering, light and dark tracks and Pass marks, and has sharp, bright and bright picture and saturated color.

The invention has the beneficial effects that:

(1) the reflective film UV curing ink-jet ink prepared by the invention has the advantages of good weather resistance, high adhesion with a reflective film, good gloss effect and the like.

(2) The reflective film formed by digital spray painting of the prepared reflective film UV curing ink-jet ink has the advantages that the inventory is extremely small, only the white reflective film and a small amount of special color reflective film are reserved, the pattern construction is simple and immediately available, the yield of products is greatly improved, and the manufacturing cost is reduced.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described in the following embodiments to fully understand the objects, aspects and effects of the present invention.

In the following examples, the organic pigments are all available from BASF corporation, Germany; dispersants were purchased from BASF, germany; acrylic resins were purchased from the winning company of germany; UV oligomers were purchased from Changxing; UV monomers were purchased from Changxing; photoinitiators were purchased from BASF, germany; ultraviolet light absorbers were purchased from BASF, germany; light stabilizers were purchased from BASF, germany; the surfactant was purchased from BYK, germany.

In the following examples, the reflective film cured inkjet ink according to the present invention was prepared.

In the following examples, the inks prepared were tested using the following performance test methods:

(1) and (3) evaluating the glossiness of the ink layer, wherein the glossiness is measured by adopting a 60-degree glossiness tester (GB/T9754): g/good, P/qualified Pass, N/unqualified NG;

(2) and (3) measuring the color density value of the ink layer, namely measuring the color density value of the color by adopting an EYEONE color corrector: g/good Goo d, P/qualified Pass, N/unqualified NG;

(3) evaluation of retroreflectivity of ink layer, measured with retroreflection marker tester (GB/T18833-2012, JT/T612-2004): p/qualified Pass, N/unqualified NG;

(4) and (3) measuring the adhesive force of the ink layer by adopting a 1mm hundred-grid tester: p/qualified Pass, N/unqualified NG;

(5) and (3) measuring the curing degree of the surface of the ink layer by adopting 99% alcohol and 1Kg weight for 50 times of wiping: p/qualified Pass, N/unqualified NG;

(6) and (3) measuring the surface hardness of the ink layer, wherein the hardness of a Chinese pencil HB is adopted for measurement: p/qualified Pass, N/unqualified NG;

(7) and (3) measuring flexibility, namely after the printed film is placed in a refrigerator at the temperature of 18 ℃ below zero for 120min, taking out the film and folding the film at an angle of 0T/180 degrees, and observing whether the film is broken: P/Pass, N/fail NG.

Example 1: preparation of yellow reflective film UV (ultraviolet) curing ink-jet ink

6 groups of yellow reflective film UV curing ink-jet inks were prepared, the raw materials of which are shown in Table 1, and the data in parentheses in the table are in parts by mass.

TABLE 1

The performance of the prepared 6 groups of yellow reflective film UV curing inkjet inks was tested, and the results are shown in Table 2:

TABLE 2

Group A1

A2

Group A3

Group A4

Group A5

Group A6

Degree of gloss

P

P

P

P

G

P

Color density

P

P

P

P

P

P

Retroreflectivity

P

P

P

P

P

P

Adhesion force

P

P

P

P

P

P

Degree of cure

N

P

P

P

P

P

Surface hardness

N

N

N

P

P

P

Flexibility

P

P

P

P

N

P

Example 2: preparation of orange reflective film UV curing inkjet ink

6 sets of orange reflective UV curable inkjet inks were prepared with the raw materials as shown in Table 3, with the data in parentheses in the tables being in parts by mass.

TABLE 3

The performance of the prepared 6 groups of orange reflective film UV curing inkjet inks was tested, and the results are shown in Table 4:

TABLE 4

Example 3: preparation of red reflective film UV curing ink-jet ink

6 sets of red reflective film UV-curable inkjet inks were prepared, the raw materials of which are shown in Table 5, and the data in parentheses in the table are in parts by mass.

TABLE 5

The performance of the prepared 6 groups of red reflective film UV-curable inkjet inks was tested, and the results are shown in table 6:

TABLE 6

Group A1

A2

Group A3

Group A4

Group A5

Group A6

Degree of gloss

P

P

P

P

G

P

Color density

P

P

P

P

P

P

Retroreflectivity

P

P

P

P

P

P

Adhesion force

P

P

P

P

P

P

Degree of cure

N

P

P

P

P

P

Surface hardness

N

N

P

N

P

N

Flexibility

P

P

P

P

P

P

Example 4: preparation of blue reflective film UV curing ink-jet ink

6 sets of blue reflective film UV curable inkjet inks were prepared with the raw materials as shown in Table 7, with the data in parentheses in the tables being in parts by mass.

TABLE 7

The performance of the prepared 6 groups of blue reflective film UV curing inkjet inks was tested, and the results are shown in Table 8:

TABLE 8

Group A1

A2

Group A3

Group A4

Group A5

Group A6

Degree of gloss

P

P

P

P

G

P

Color density

P

P

P

P

P

P

Retroreflectivity

P

P

P

P

P

P

Adhesion force

P

P

P

P

P

P

Degree of cure

N

P

P

P

P

P

Surface hardness

N

N

P

P

P

N

Flexibility

P

P

P

P

P

P

Example 5: preparation of green reflective film UV curing ink-jet ink

6 sets of green reflective film UV-curable inkjet inks were prepared from the raw materials shown in Table 9, with the data in parentheses in the tables being in parts by mass.

TABLE 9

The performance of the prepared 6 groups of green reflective film UV-curable inkjet inks was measured, and the results are shown in table 10:

watch 10

Example 6: preparation of brown reflective film UV (ultraviolet) curing ink-jet ink

6 sets of brown reflective film UV-curable inkjet inks were prepared from the raw materials shown in Table 11, wherein the data in parentheses in the table are in parts by mass.

TABLE 11

The performance of the prepared 6 groups of brown reflective film UV-curable inkjet inks was tested, and the results are shown in Table 12:

TABLE 12

Group A1

A2

Group A3

Group A4

Group A5

Group A6

Degree of gloss

P

P

P

P

G

P

Color density

P

P

P

P

P

P

Retroreflectivity

P

P

P

P

P

P

Adhesion force

P

P

P

P

P

P

Degree of cure

N

P

P

P

P

P

Surface hardness

N

N

P

N

P

P

Flexibility

P

P

P

P

P

P

Example 7: preparation of black reflective film UV (ultraviolet) curing ink-jet ink

6 sets of black reflective film UV curable inkjet inks were prepared with the raw materials as shown in Table 13, with the data in parentheses in the tables being in parts by mass.

Watch 13

The performance of the prepared 6 groups of black reflective film UV-curable inkjet inks was measured, and the results are shown in table 14:

TABLE 14

Group A1

A2

Group A3

Group A4

Group A5

Group A6

Degree of gloss

P

P

P

P

G

P

Color density

P

P

P

P

P

P

Retroreflectivity

P

P

P

P

P

P

Adhesion force

P

P

P

P

P

P

Degree of cure

N

P

P

P

P

P

Surface hardness

N

N

P

N

P

N

Flexibility

P

P

P

P

P

P

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.

Claims (10)

1. The reflective film UV curing ink-jet ink is characterized by comprising the following raw materials in parts by weight: 2-5 parts of organic pigment, 1-3 parts of dispersant, 1-10 parts of acrylic resin, 10-20 parts of UV oligomer, 60-90 parts of UV monomer, 5-15 parts of photoinitiator and 0.1-2 parts of light stabilizer;

the dispersing agent is a controllable polymerized AB block acrylic copolymer with pigment-philic groups; the UV oligomer comprises a first oligomer and/or a second oligomer, and the first UV oligomer is aliphatic polyurethane; the second UV oligomer is etherified polyester;

the UV monomer comprises a first UV monomer and at least one of a second UV monomer and a third UV monomer, and the first UV monomer comprises at least 3 monofunctional UV monomers; the second UV monomer is a bifunctional UV monomer; the third UV monomer is a multifunctional UV monomer;

the photoinitiator comprises a first photoinitiator and at least one of a second photoinitiator, a third photoinitiator and a fourth photoinitiator; the first photoinitiator is one of 2,4, 6-trimethylbenzoyl-diphenyl phosphorus oxide, 2,4, 6-trimethylbenzoyl ethyl phosphate and phenyl bis (2,4, 6-trimethylbenzoyl) phosphorus oxide; the second photoinitiator is one of 2-methyl-2 (4-morpholinyl) -1- (4- (methylthio) -phenyl) -1-acetone, 1-hydroxy-cyclohexyl-phenyl ketone and 2-hydroxy-methylphenyl propane-1-ketone; the third photoinitiator is 2-isopropyl thioxanthone or 2, 4-diethyl thioxanthone; the fourth photoinitiator is one of 2-benzyl-2-dimethylamino-1- (4-morpholinylphenyl) -1-butanone, 2- (4-methylamino) -2-dimethylamino-1- (4-morpholinylphenyl) -1-butanone and 1- (4- (2-hydroxyethoxy) phenyl) -2-hydroxy-2-methyl-amino-1-acetone;

the light stabilizer is a hindered amine light stabilizer, preferably one of TINUVIN123, TINUVIN144, TINUVIN292 and TINUVIN 5100.

2. The reflective film UV-curable inkjet ink according to claim 1, wherein the raw materials further comprise, in parts by weight, 0.1 to 2 parts of a first ultraviolet absorber and 0.1 to 2 parts of a second ultraviolet absorber, wherein the first ultraviolet absorber is a triazine ultraviolet absorber; the second ultraviolet absorber is a benzotriazole ultraviolet absorber;

preferably, the first ultraviolet light absorber is one of TINUVIN400, TINUVIN405, TINUVIN477 and TINUVIN 479; the second ultraviolet absorber is one of TINUVIN328, TINUVIN900, TINUVIN928 and TINUVIN 1130.

3. The reflective film UV-curable inkjet ink according to claim 1, wherein the raw materials further comprise 0.1 to 2 parts by weight of a surfactant;

preferably, the surfactant is one of BYK-3500, BYK-3505, BYK-3510, BYK-3570, BYK-377, BYK-378 and BYK-3760.

4. The retroreflective UV curable inkjet ink of claim 1, wherein the dispersant is at least one of PX4310, PX4340, PX4700, PX4701, PX4730, PX4731, and PX 4732.

5. The UV curable inkjet ink for retroreflective sheeting of claim 1 wherein the first UV oligomer is at least one of 6101, DR-U161, DR-U163, 6106 and 6112-; the second UV oligomer is at least one of 6420, DR-E661, 63380, and 63425.

6. The reflective film UV curable inkjet ink according to claim 1, wherein the first UV monomer is at least three of isobornyl acrylate, 2-phenoxyethyl acrylate, tetrahydrofuran acrylate, ethoxyethoxyethyl acrylate, cyclotrimethylolpropane methyl acrylate, acryloyl morpholine, dimethylacrylamide, hydroxyethyl acrylamide, hydroxyethyl methacrylate, diethylacrylamide and vinyl pyrrolidone;

the second UV monomer is one or two of 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, (propoxylated) neopentyl glycol diacrylate and dipropylene glycol diacrylate;

the third UV monomer is one of dipentaerythritol hexaacrylate, trimethylolpropane triacrylate and ethoxy trimethylolpropane triacrylate.

7. The UV-curable inkjet ink for the reflective film as claimed in claim 1, wherein the acrylic resin is a solid particulate powder, has a Tg of 45-85 ℃, an acid value of 1-9KOH/g, a molecular weight of 5000-180000, and a solid content of more than 99.5%.

8. A method for preparing the reflective film UV curable inkjet ink according to any one of claims 1 to 7, wherein when the UV monomers are more than 4, the method comprises the following steps: mixing CO1 nano color paste, MT1 connecting material pre-solution and the rest UV monomer, stirring for 20-30min at the rotating speed of 8-10m/s, then keeping the rotating speed, sequentially adding IO1 photoinitiator pre-solution and IO2 pre-solution, continuously stirring for 20-30min, and filtering to obtain the reflective film UV curing inkjet ink; the remaining UV monomers are the UV monomers other than UV monomer A, UV monomer B, UV monomer C and UV monomer D;

when the UV monomers are equal to 4, the preparation method comprises the steps of: mixing CO1 nanometer color paste and MT1 connecting material pre-solution, stirring for 20-30min at the rotating speed of 8-10m/s, then keeping the rotating speed, sequentially adding IO1 photoinitiator pre-solution and IO2 pre-solution, continuously stirring for 20-30min, and filtering to obtain the reflective film UV curing inkjet ink;

the CO1 nanometer color paste is obtained according to the following steps: mixing the UV monomer A and a dispersing agent, stirring for 10-20min at the rotating speed of 3-6m/s, adding the organic pigment, adjusting the rotating speed to 8-10m/s, continuing stirring for 30-60min, and then grinding to obtain the CO1 nano color paste;

the MT1 vehicle pre-solution was obtained according to the following steps: placing the UV monomer B at the rotating speed of 3-4m/s for stirring, simultaneously adding acrylic resin, adjusting the rotating speed to 11-13m/s after the addition is finished, and continuously stirring for 120-150min to obtain the MT1 connecting material pre-solution;

the IO1 photoinitiator pre-solution was obtained according to the following steps: mixing the photoinitiator with the UV monomer C, and stirring at the rotating speed of 8-10m/s for 30-60min to obtain an IO1 photoinitiator pre-solution;

the IO2 pre-solution was obtained according to the following steps: mixing the light stabilizer and the UV monomer D, and stirring at the rotating speed of 8-10m/s for 30-60min to obtain the IO2 pre-solution;

the UV monomer A, the UV monomer B, the UV monomer C and the UV monomer D are respectively one of the UV monomers; the above processes are all carried out under the condition of keeping out light.

9. Use of the retroreflective film UV curable inkjet ink according to any one of claims 1 to 7 in inkjet printing of retroreflective films.

10. The use of claim 9, wherein the use of the retroreflective film UV curable inkjet ink in retroreflective film inkjet printing comprises the steps of:

and (2) loading a reflective film on UV (ultraviolet) spray painting equipment, loading the UV curing ink-jet ink of the reflective film into a printing head, setting a pattern to be output on a computer, setting the distance between the reflective film and the printing head to be 2-3mm, sending the pattern to a printer, and printing the pattern.