UV ink and preparation method thereof

Abstract

The invention belongs to the technical field of printing supplies, and discloses UV ink and a preparation method thereof. The UV ink comprises polyester acrylate, an active monomer, an active diluent and a photoinitiator, wherein the active monomers comprise a first active monomer and a second active monomer, and the mass ratio of the first active monomer to the second active monomer is 1: (1-3); the first active monomer comprises an acryloyl morpholine active monomer and an alkyl acetal acrylic ester active monomer, and the second active monomer comprises a furan ring active monomer and an aliphatic epoxy active monomer; the reactive diluent is butyl glycidyl ether and dipropylene glycol diacrylate, and the mass ratio of the butyl glycidyl ether to the dipropylene glycol diacrylate is 1: (2-5). The UV ink provided by the invention has excellent color saturation and adhesive force on a PE film while meeting the requirements of stability and printing smoothness, and can be widely applied to printers provided with industrial printing heads.

Description

Technical Field

[0001] The invention belongs to the technical field of printing consumables, and in particular relates to UV ink and a preparation method thereof. Background Art

[0002] UV ink is a high-performance environmentally friendly product developed on the basis of light-curing coatings. Its second generation adopts an acrylate curing system, which has the characteristics of fast curing speed and high cross-linking efficiency.

[0003] PE film is currently a widely used packaging material due to its good chemical stability. Often in the printing industry, PE film is difficult to print. Even if the surface is treated with plasma, traditional inks or general acrylic digital inkjet cannot achieve good adhesion. The main reason is that the traditional UV ink has more formula components and there are various differences in the curing of various monomers. The adhesion of monofunctional monomers to the substrate is more critical, but the curing speed is slow and the curing surface is poor. Therefore, in the design of the formula, it is considered to supplement with difunctional or higher high-functional monomers to make up for the defects of monofunctional slow curing, low cross-linking reaction, poor surface drying, etc. However, this also causes a strong shrinkage problem during inkjet curing, resulting in excellent surface drying and rapid curing of inkjet but poor bottom drying, and the film layer does not have good contact with the substrate. Therefore, it is difficult for traditional free radical ink to have a good surface adhesion effect on PE plastic. In addition, due to the inherent characteristics of the free radical initiation mechanism, general acrylates will slow down or even stop the cross-linking reaction once the energy light source is lost during the cross-linking process. The monomer reaction is not sufficient and residues appear, so that the unreacted monomers in the cured film layer and the small molecular compounds produced by the decomposition of the initiator emit a strong odor. In addition, the monofunctional monomers have a low molecular weight and high volatility. The monomers are highly irritating to the human body, which is not conducive to the health of the operators.

[0004] In addition, the patterns printed on PE film often have low color saturation. Color saturation, also known as color density, refers to the depth of a color in a printed product and is one of the key indicators for evaluating the quality and consistency of printed products.

[0005] Therefore, there is an urgent need to provide a UV ink that has good adhesion to the PE film and prints patterns with high color saturation. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a UV ink and a preparation method thereof. The UV ink provided by the present invention can exhibit a good adhesion effect on the surface-treated PE film after printing and curing, and the printed pattern has high color saturation.

[0007] The present invention provides a UV ink, which comprises the following components by weight: Polyester acrylate 10-40 parts Active monomer 30-70 parts Active diluent 3-20 parts Photoinitiator 3-15 parts The active monomer includes a first active monomer and a second active monomer, and the mass ratio of the first active monomer to the second active monomer is 1:(1-3); The first reactive monomer includes an acryloylmorpholine reactive monomer and an alkyl acetal acrylate reactive monomer, wherein the acryloylmorpholine reactive monomer is selected from N-acryloylmorpholine and / or N-methacryloylmorpholine, and the alkyl acetal acrylate reactive monomer is selected from at least one of acetal acrylate, acetal methacrylate, and cyclotrimethylolpropane methyl acrylate; The second reactive monomers include furan ring reactive monomers and aliphatic epoxy reactive monomers; The active diluent is butyl glycidyl ether and dipropylene glycol diacrylate; the mass ratio of the butyl glycidyl ether to the dipropylene glycol diacrylate is 1:(2-5).

[0008] Preferably, the mass ratio of the first active monomer to the second active monomer is 1:(1.5-2.5).

[0009] Preferably, the mass ratio of the acryloylmorpholine active monomer to the alkyl acetal acrylate active monomer is 1:(0.2-5); further preferably, the mass ratio of the acryloylmorpholine active monomer to the alkyl acetal acrylate active monomer is (0.3-3).

[0010] Preferably, the furan ring active monomer is 2-furan acrylic acid; the aliphatic epoxy active monomer is at least one selected from bisphenol A diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, and 1,4-butanediol diglycidyl ether.

[0011] Preferably, the mass ratio of the furan ring active monomer to the aliphatic epoxy active monomer is 1:(1-3); further preferably, the mass ratio of the furan ring active monomer to the aliphatic epoxy active monomer is 1:(1-2).

[0012] Preferably, the polyester acrylate is selected from at least one of aliphatic polyurethane acrylate, aromatic polyurethane acrylate and silicone-modified polyurethane acrylate.

[0013] Preferably, the photoinitiator is selected from at least one of diazonium salt photoinitiators, arylsulfonium photoinitiators, iodonium salt photoinitiators, sulfonyloxy ketone photoinitiators, triarylsiloxane photoinitiators, and coumarin oxime ester photoinitiators.

[0014] Preferably, the UV ink comprises the following components in parts by weight: Polyester acrylate 15-35 parts Active monomer 35-65 parts Active diluent 5-15 parts Photoinitiator 5-10 parts.

[0015] Further preferably, the UV ink comprises the following components in parts by weight: Polyester acrylate 20-30 parts Active monomer 40-60 parts Active diluent 8-15 parts Photoinitiator 6-10 parts.

[0016] Preferably, the UV ink further comprises 2-15 parts of nano-pigment and 0.5-15 parts of auxiliary agent by weight.

[0017] Preferably, the nanoscale pigment includes at least one of pigment blue, pigment red, pigment yellow, carbon black and titanium dioxide.

[0018] Preferably, the auxiliary agent includes at least one of a dispersant, a leveling agent and a wetting agent; the dispersant includes at least one of Dispers710 and Dispers681; the leveling agent includes at least one of Rad 2200 and Rad2250; the wetting agent includes at least one of Rad 2600 and Rad2700.

[0019] The present invention also provides a method for preparing UV ink, comprising the following steps: The nano-scale pigment, the first active monomer and the auxiliary agent are mixed, dispersed and ground, and then polyester acrylate, the second active monomer, the active diluent and the photoinitiator are added, mixed evenly, and filtered to obtain UV ink.

[0020] Preferably, the filtering step is to first filter with a 1.0 μm glass fiber filter membrane and then filter with a 0.45 μm PP filter membrane.

[0021] Compared with the prior art, the present invention has the following beneficial effects: (1) The UV ink provided by the present invention has polyester acrylate, active monomer, active diluent, and photoinitiator as main components, wherein the active monomer includes a first active monomer composed of acryloyl morpholine and alkyl acetal acrylate with low volatile odor, and a second active monomer composed of furan ring and aliphatic epoxy with good adhesion. By controlling the ratio of the first active monomer and the second active monomer, the cross-linking and curing effect of the ink on the PE film can be optimized to form a printing layer with dense film texture, strong adhesion, and high color saturation. In addition, the present invention uses butyl glycidyl ether and dipropylene glycol diacrylate as active diluents, and by controlling the ratio of the two, it can not only effectively reduce the viscosity of the system, improve the fluidity of the system and the compatibility of each component, thereby improving the stability of the ink and the smoothness of printing; but also facilitates the penetration and adhesion of the ink, and improves the curing speed and adhesion performance of the ink.

[0022] (2) The UV ink provided by the present invention can meet the requirements of stability and printing smoothness, and also has excellent color saturation and adhesion on the PE film, and can be widely used in printers equipped with industrial-grade print heads. DETAILED DESCRIPTION

[0023] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0024] Unless otherwise specified, the raw materials, reagents or devices used in the following examples and comparative examples can be obtained from conventional commercial sources or by existing known methods.

[0025] Example 1 A UV ink, comprising the following components by weight: Aliphatic polyurethane acrylate (UCECOAT 7177) 25 parts 18 parts of the first active monomer 36 parts of the second active monomer Active diluent 12 parts 8 parts of diphenyliodonium hexafluorophosphate 8 parts of nano pigment blue Dispersant Dispers710 2 parts Leveling agent Rad 2200 1 part Wetting agent Rad 2600 1 part; The first active monomer is 8 parts of N-acryloylmorpholine and 10 parts of acetal acrylate; the second active monomer is 12 parts of 2-furan acrylic acid and 24 parts of bisphenol A diglycidyl ether; and the active diluent is 3 parts of butyl glycidyl ether and 9 parts of dipropylene glycol diacrylate.

[0026] A method for preparing UV ink comprises the following steps: The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0027] Example 2 A UV ink, comprising the following components by weight: Aliphatic polyurethane acrylate 28 parts 18 parts of the first active monomer 42 parts of the second active monomer Active diluent 16 parts 9 parts of diphenyliodonium hexafluorophosphate Nano-pigment blue 9 parts Dispersant Dispers710 2 parts Leveling agent Rad 2200 1 part Wetting agent Rad 2600 1 part; The first active monomer is 8 parts of N-methacryloylmorpholine and 10 parts of acetal methacrylate; the second active monomer is 14 parts of 2-furan acrylic acid and 28 parts of 1,4-butanediol diglycidyl ether; and the active diluent is 4 parts of butyl glycidyl ether and 12 parts of dipropylene glycol diacrylate.

[0028] A method for preparing UV ink comprises the following steps: The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0029] Example 3 A UV ink, comprising the following components by weight: Aliphatic polyurethane acrylate 35 parts 12 parts of the first active monomer 24 parts of the second active monomer Active diluent 7 parts 8 parts of diphenyliodonium hexafluorophosphate 8 parts of nano pigment blue Dispersant Dispers710 2 parts Leveling agent Rad 2200 1 part Wetting agent Rad 2600 1 part; The first active monomer is 5 parts of N-acryloylmorpholine and 7 parts of acetal acrylate; the second active monomer is 8 parts of 2-furan acrylic acid and 16 parts of bisphenol A diglycidyl ether; and the active diluent is 2 parts of butyl glycidyl ether and 5 parts of dipropylene glycol diacrylate.

[0030] A method for preparing UV ink comprises the following steps: The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0031] Example 4 A UV ink, comprising the following components by weight: Aliphatic polyurethane acrylate 25 parts 27 parts of the first active monomer 27 parts of the second active monomer Active diluent 12 parts 8 parts of diphenyliodonium hexafluorophosphate 8 parts of nano pigment blue Dispersant Dispers710 2 parts Leveling agent Rad 2200 1 part Wetting agent Rad 2600 1 part; The first active monomer is 12 parts of N-acryloylmorpholine and 15 parts of acetal acrylate; the second active monomer is 14 parts of 2-furan acrylic acid and 13 parts of bisphenol A diglycidyl ether; the active diluent is 4 parts of butyl glycidyl ether and 8 parts of dipropylene glycol diacrylate.

[0032] A method for preparing UV ink comprises the following steps: The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0033] Comparative Example 1 A UV ink, comprising the following components by weight: Aliphatic polyurethane acrylate 25 parts 18 parts of the first active monomer 36 parts of the second active monomer Active diluent 12 parts 8 parts of diphenyliodonium hexafluorophosphate 8 parts of nano pigment blue Dispersant Dispers710 2 parts Leveling agent Rad 2200 1 part Wetting agent Rad 2600 1 part; The first active monomer is acetal acrylate; the second active monomer is bisphenol A diglycidyl ether; and the active diluent is 3 parts of butyl glycidyl ether and 9 parts of dipropylene glycol diacrylate.

[0034] A method for preparing UV ink comprises the following steps: The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0035] Comparative Example 2 A UV ink, comprising the following components by weight: Aliphatic polyurethane acrylate 25 parts 36 parts of the first active monomer 18 parts of the second active monomer Active diluent 12 parts 8 parts of diphenyliodonium hexafluorophosphate 8 parts of nano pigment blue Dispersant Dispers710 2 parts Leveling agent Rad 2200 1 part Wetting agent Rad 2600 1 part; The first active monomer is 16 parts of N-acryloylmorpholine and 20 parts of acetal acrylate; the second active monomer is 6 parts of 2-furan acrylic acid and 12 parts of bisphenol A diglycidyl ether; and the active diluent is 3 parts of butyl glycidyl ether and 9 parts of dipropylene glycol diacrylate.

[0036] A method for preparing UV ink comprises the following steps: The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0037] Comparative Example 3 A UV ink, comprising the following components by weight: Aliphatic polyurethane acrylate 25 parts 18 parts of the first active monomer 36 parts of the second active monomer Active diluent 12 parts 8 parts of diphenyliodonium hexafluorophosphate 8 parts of nano pigment blue Dispersant Dispers710 2 parts Leveling agent Rad 2200 1 part Wetting agent Rad 2600 1 part; The first active monomer is 8 parts of N-acryloylmorpholine and 10 parts of acetal acrylate; the second active monomer is 12 parts of 2-furan acrylic acid and 24 parts of bisphenol A diglycidyl ether; and the active diluent is 12 parts of dipropylene glycol diacrylate.

[0038] A method for preparing UV ink comprises the following steps: The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0039] Comparative Example 4 A UV ink, comprising the following components by weight: Aliphatic polyurethane acrylate 25 parts 18 parts of the first active monomer 36 parts of the second active monomer Active diluent 12 parts 8 parts of diphenyliodonium hexafluorophosphate 8 parts of nano pigment blue Dispersant Dispers710 2 parts Leveling agent Rad 2200 1 part Wetting agent Rad 2600 1 part; The first active monomer is 8 parts of N-acryloylmorpholine and 10 parts of acetal acrylate; the second active monomer is 18 parts of 1,4-butanediol diglycidyl ether and 18 parts of bisphenol A diglycidyl ether; and the active diluent is 3 parts of butyl glycidyl ether and 9 parts of dipropylene glycol diacrylate.

[0040] A method for preparing UV ink comprises the following steps: The nano-scale pigment blue, the first active monomer, and the dispersant Dispers710 are mixed and dispersed and ground; then the second active monomer, the active diluent, the aliphatic polyurethane acrylate, the photoinitiator diphenyliodonium hexafluorophosphate, the leveling agent Rad 2200, and the wetting agent Rad 2600 are added and mixed thoroughly; then filtered through a 1.0 μm glass fiber filter membrane, and finally filtered through a 0.45 μm PP filter membrane, and the obtained filtrate is the UV ink.

[0041] Product effect testing 1. Stability test The UV inks prepared in Examples 1-4 and Comparative Examples 1-4 were tested for stability. The specific test process was as follows: the UV ink was first placed at -10°C for 1 day, then placed at 60°C for 1 day, and then placed at -10°C for 1 day, and this cycle was repeated 7 times to observe whether the UV ink was stratified. The UV ink was then printed using a high-speed printer with a Kyocera nozzle (printing speed of 150 m / min) to observe whether the nozzle was blocked and whether the printing was interrupted, and to determine the printing smoothness. The test results are shown in Table 1.

[0042] 2. Adhesion test The UV inks prepared in Examples 1-4 and Comparative Examples 1-4 were printed on PE films respectively. After they were completely cured, the coatings were wiped 200 times with a white textile cloth soaked in ultrapure water under a pressure of 1 kg on a friction tester, and two back and forth times were counted. After wiping, it was observed whether the printed layer surface was blurred, peeled, or exposed to the substrate. The test results are shown in Table 1.

[0043] 3. Color density (color saturation) test Take 1.8L of UV ink prepared in Examples 1-4 and Comparative Examples 1-4, respectively, and use a high-speed printer with a ceramic nozzle (printing speed of 150m / min) to print. On the PE film, print a single color block with 80% ink volume. After complete curing, use the American X-RITE colorimeter to test and record the color density value. The ambient temperature is controlled at 25°C and the ambient humidity is controlled at about 45% during the printing and standby stages. The test results are shown in Table 2.

[0044] Table 1

[0045] As shown in Table 1, the UV ink prepared in the embodiment of the present invention has good stability. After high and low temperature cycle treatment, the ink does not delaminate, and the printing fluency is excellent, which is significantly better than the comparative example. In the adhesion test, the printing layer of the embodiment of the present invention is tightly combined with the PE film, has strong adhesion, and is resistant to wiping, which is also significantly better than the comparative example.

[0046] Table 2

[0047] The examples of the present invention and the comparative examples are all of the same color, wherein the nano pigment blue content in each ink in Example 1, Example 4 and the comparative example is the same, and the rest are slightly different. After each group of inks is printed on a PE film, the examples of the present invention exhibit higher color density and higher color saturation, which is better than the comparative example.

[0048] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A UV ink, characterized in that: By weight, it includes the following components: Polyester acrylate 10-40 parts Active monomer 30-70 parts Active diluent 3-20 parts Photoinitiator 3-15 parts The active monomer includes a first active monomer and a second active monomer, and the mass ratio of the first active monomer to the second active monomer is 1:(1-3); The first reactive monomer includes an acryloylmorpholine reactive monomer and an alkyl acetal acrylate reactive monomer, wherein the acryloylmorpholine reactive monomer is selected from N-acryloylmorpholine and / or N-methacryloylmorpholine, and the alkyl acetal acrylate reactive monomer is selected from at least one of acetal acrylate, acetal methacrylate, and cyclotrimethylolpropane methyl acrylate; The second reactive monomers include furan ring reactive monomers and aliphatic epoxy reactive monomers; The active diluent is butyl glycidyl ether and dipropylene glycol diacrylate; the mass ratio of the butyl glycidyl ether to the dipropylene glycol diacrylate is 1:(2-5).

2. The UV ink according to claim 1, characterized in that: The mass ratio of the acryloylmorpholine active monomer to the alkyl acetal acrylate active monomer is 1:(0.2-5).

3. The UV ink according to claim 1 or 2, characterized in that: The furan ring active monomer is 2-furan acrylic acid; the aliphatic epoxy active monomer is at least one selected from bisphenol A diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, and 1,4-butanediol diglycidyl ether.

4. The UV ink according to claim 3, characterized in that: The mass ratio of the furan ring active monomer to the aliphatic epoxy active monomer is 1:(1-3).

5. The UV ink according to claim 1 or 2, characterized in that: The polyester acrylate is selected from at least one of aliphatic polyurethane acrylate, aromatic polyurethane acrylate and silicone-modified polyurethane acrylate.

6. The UV ink according to claim 1 or 2, characterized in that: The photoinitiator is selected from at least one of diazonium salt photoinitiators, arylsulfonium photoinitiators, iodonium salt photoinitiators, sulfonyloxy ketone photoinitiators, triaryl siloxane photoinitiators, and coumarin oxime ester photoinitiators.

7. The UV ink according to any one of claims 1, 2 and 4, characterized in that: The UV ink comprises the following components by weight: Polyester acrylate 15-35 parts Active monomer 35-65 parts Active diluent 5-15 parts Photoinitiator 5-10 parts.

8. The UV ink according to claim 7, characterized in that: The UV ink further comprises 2-15 parts of nano-scale pigments and 0.5-15 parts of additives by weight.

9. The UV ink according to claim 8, characterized in that: The nano-scale pigment includes at least one of pigment blue, pigment red, pigment yellow, carbon black and titanium dioxide.

10. The method for preparing the UV ink according to claim 8 or 9, characterized in that: The following steps are involved: The nano-scale pigment, the first active monomer and the auxiliary agent are mixed, dispersed and ground, and then polyester acrylate, the second active monomer, the active diluent and the photoinitiator are added, mixed evenly, and filtered to obtain UV ink.

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