阅读说明：本技术 一种用于塑胶材质的led固化移印油墨 (LED curing pad printing ink for plastic materials ) 是由 葛鹏 汪小峰 范海军 花魁昌 徐宏 王全 欧阳旭频 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种用于塑胶材质的LED固化移印油墨,属于移印油墨技术领域。一种用于塑胶材质的LED固化移印油墨,组成部分包括光引发剂、助引发剂、溶剂、超支化聚酯丙烯酸酯、聚酯丙烯酸酯、酚醛环氧丙烯酸酯、消泡剂、分散剂、颜料、填料和增稠剂；本发明与现有技术相比固化范围宽,可使用汞灯、卤素灯、LED灯对移印油墨进行固化,同时该移印油墨的移印字体纤细,线条宽度能够达到0.2mm,且耐RCA摩擦能够达到45次以上,并且本发明的油墨在硅胶头移印字体后,胶头表面油墨残留量小于10％,油墨转移量高,且字体清晰饱满,同时本发明能够有效降低化学品对油墨涂层侵蚀,而造成油墨附着不良发生脱漆的现象。(The invention discloses an LED curing pad printing ink for plastic materials, and belongs to the technical field of pad printing inks. An LED curing pad printing ink for plastic materials comprises a photoinitiator, an auxiliary initiator, a solvent, hyperbranched polyester acrylate, novolac epoxy acrylate, a defoaming agent, a dispersing agent, a pigment, a filler and a thickening agent; compared with the prior art, the curing range is wide, the pad printing ink can be cured by using a mercury lamp, a halogen lamp and an LED lamp, meanwhile, the pad printing font of the pad printing ink is fine, the line width can reach 0.2mm, and the RCA (Rolling circle amplification) friction resistance can reach more than 45 times.)

1. The LED curing pad printing ink for the plastic material is characterized by comprising a photoinitiator, an auxiliary initiator, a solvent, hyperbranched polyester acrylate, novolac epoxy acrylate, a defoaming agent, a dispersing agent, a pigment, a filler and a thickening agent.

2. The LED curing pad printing ink for plastic materials as claimed in claim 1, wherein the photoinitiator is one or more selected from 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-one and 2-isopropyl thioxanthone, and the co-initiator is one selected from ethyl N, N-dimethyl benzoate, 2-ethylhexyl N, N-dimethyl benzoate and dimethylaminoethyl benzoate.

3. The LED curing pad printing ink for plastic materials as claimed in claim 1, wherein the solvent comprises esters such as butyl acetate, propylene glycol methyl ether acetate, cyclohexanone, etc. or ketones.

4. The LED curing pad printing ink for plastic materials as claimed in claim 1, wherein the pigment is one of titanium dioxide, aurora red, lithol scarlet, hansa yellow R, methyleneamine pigment yellow, permanent yellow, phthalocyanine blue, ultramarine blue, quinacridone violet and carbon black;

the carbon black is specifically one of Mitsubishi MA11, MA7, Chuntai AS-82, AS-99A, AS-45, Columbia Raven410, Raven420 and Raven 450.

5. The LED curing pad printing ink for plastic materials as claimed in claim 1, wherein the defoaming agent is one of BYK-054, BYK-066N, BYK-088, BYK-1790, BYK-A500 and SiFastSF 831;

the dispersing agent is specifically one of BYK-163, BYK-168 and BYK-2008;

the filler is one or more of calcium carbonate, barium sulfate, talcum powder and poly (tetrafluoroethylene) wax;

the thickener is one or more of fumed silica and organic bentonite.

6. The LED curing pad printing ink for the plastic materials as claimed in claim 1, wherein the components are composed of the following components in parts by mass:

photoinitiator (2): 8-12 parts;

solvent: 10-15 parts;

hyperbranched polyester acrylate: 5-10 parts;

polyester acrylate: 25-45 parts;

phenolic epoxy acrylate: 8-20 parts;

defoaming agent: 0.3-1 part;

dispersing agent: 2-5 parts;

pigment: 4-25 parts;

filling: 3-15 parts;

thickening agent: 0.5-1 part.

7. The preparation method of the LED curing pad printing ink for the plastic material is applied to the LED curing pad printing ink for the plastic material, which is characterized by comprising the following steps of:

s1: putting a photoinitiator into a batching barrel;

s2: adding a solvent into the solution obtained in the step S1, stirring the solution, and enabling the solution to be free of particles;

s3: sequentially adding hyperbranched polyester acrylate, polyester acrylate and novolac epoxy acrylate into the step S2;

s4: stirring the mixed solution in the step S3, and uniformly mixing;

s5: adding a dispersing agent into the step S4, and stirring;

s6: adding pigment in the phase step S5, and stirring;

s7: grinding the mixed solution in the step S6 by using a grinder;

s8: adding calcium carbonate as a filler, barium sulfate, talcum powder, wax powder, a dispersing agent and a thickening agent into the mixed solution obtained in the step S7 in sequence, and stirring;

s9: performing secondary grinding on the mixed solution in the step S8 by using a grinding machine;

s10: adding a solvent into the step S9, and stirring;

s11: and filtering the mixed liquid in the step S10 to obtain the LED curing pad printing ink for the plastic material.

8. The LED curing pad printing ink as claimed in claim 7, wherein the stirring device in the manufacturing step is a dispersion machine, and the rotation speed of the dispersion machine is 800-.

9. The LED curing pad printing ink for plastic materials as claimed in claim 7, wherein the grinder in steps S7 and S9 is a three-roll grinder, and the grinding fineness is less than or equal to 5 μ.

10. The LED curing pad printing ink for plastic materials as claimed in claim 7, wherein the filter cloth of step S11 has a mesh size of 300 meshes.

Technical Field

The invention relates to the technical field of pad printing ink, in particular to LED curing pad printing ink for plastic materials.

Background

The pad printing process is a special printing process which is widely applied, firstly a mold is opened on a steel plate to manufacture needed figures and characters, then ink in the mold groove is transferred to the surface of a material through a silica gel head, characters or patterns can be pad printed on products with small areas, concave and convex surfaces and irregular surfaces, the pad printing process has very obvious advantages, the defects of the screen printing process are overcome, compared with solvent type pad printing ink, the UV pad printing ink has the advantages of small VOC volatilization amount, environmental protection, rapid curing, high production efficiency and the like.

The UV curing mode comprises modes of a mercury lamp, a halogen lamp, an LED lamp and the like, wherein the ultraviolet wavelength emitted by the mercury lamp and the halogen lamp is 200-400nm, the wave band is wide, multiple photoinitiators can be used in a matching mode, the curing purpose can be achieved easily, the wave band of the LED lamp is single, generally 365nm and 395nm, the types of the selectable photoinitiators are few, and the curing is difficult, so that the ink curing range in the prior art is narrow.

By search, Chinese patent CN108641470A discloses a solvent-free UV-LED curable pad printing ink with 5-15 parts of monomers, from the monomer proportion, good ink transferability is difficult to achieve due to lack of solvent volatilization gradient, the monomers hardly volatilize, when the monomer is used for achieving the purpose of dilution, the ink transferability is obviously affected by the monomer amount exceeding 5%, and when the monomer content exceeds more than 10%, the residual ink amount on an adhesive head reaches 100%, so that the defects of shallow pad printing coating, bottom penetration and the like on materials are caused.

Chinese patent CN102250508B discloses an ultraviolet light-cured pad printing ink, its RCA test can reach 300 times without dropping off, but the test does not note the concrete shape of the tested part, the line and face test effect has great difference, when the line of pad printing font is extremely fine and reaches 0.2mm, the contact area between the roller of RCA tester and the material is larger than the font line width and completely covers the font, such test condition is far more harsh than friction coating face.

In addition, the pad printing ink in the prior art is easy to be strongly corroded by chemicals containing ester solvents, glycerin and the like, so that the adhesion of an ink coating is poor, and phenomena such as paint removal and the like occur, so that the pad printing ink in the prior art still has some defects.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an LED curing pad printing ink for a plastic material.

In order to achieve the purpose, the invention adopts the following technical scheme:

an LED curing pad printing ink for plastic materials comprises a photoinitiator, an auxiliary initiator, a solvent, hyperbranched polyester acrylate, novolac epoxy acrylate, a defoaming agent, a dispersing agent, a pigment, a filler and a thickening agent.

Preferably, the photoinitiator is one or more of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide, bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-one and 2-isopropyl thioxanthone, and the co-initiator is one of N, N-ethyl dimethyl benzoate, N-2-ethylhexyl dimethyl benzoate and dimethylaminoethyl benzoate.

Preferably, the solvent includes ester or ketone solvents such as butyl acetate, propylene glycol methyl ether acetate and cyclohexanone.

Preferably, the pigment is one of titanium dioxide, aurora red, lithol scarlet, hansa yellow R, methyleneamine pigment yellow, permanent yellow, phthalocyanine blue, ultramarine blue, quinacridone violet and carbon black;

the carbon black is specifically one of Mitsubishi MA11, MA7, Chuntai AS-82, AS-99A, AS-45, Columbia Raven410, Raven420 and Raven 450.

Preferably, the defoaming agent is specifically one of BYK-054, BYK-066N, BYK-088, BYK-1790, BYK-A500 and SiFastSF 831;

the dispersing agent is specifically one of BYK-163, BYK-168 and BYK-2008;

the filler is one or more of calcium carbonate, barium sulfate, talcum powder and poly (tetrafluoroethylene) wax;

the thickener is one or more of fumed silica and organic bentonite.

Preferably, the components are composed of the following components in parts by mass:

photoinitiator (2): 8-12 parts;

solvent: 10-15 parts;

hyperbranched polyester acrylate: 5-10 parts;

polyester acrylate: 25-45 parts;

phenolic epoxy acrylate: 8-20 parts;

defoaming agent: 0.3-1 part;

dispersing agent: 2-5 parts;

pigment: 4-25 parts;

filling: 3-15 parts;

thickening agent: 0.5-1 part.

A preparation method of LED curing pad printing ink for plastic materials comprises the following steps:

s1: putting a photoinitiator into a batching barrel;

s2: adding a solvent into the solution obtained in the step S1, stirring the solution, and enabling the solution to be free of particles;

s3: sequentially adding hyperbranched polyester acrylate, polyester acrylate and novolac epoxy acrylate into the step S2;

s4: stirring the mixed solution in the step S3, and uniformly mixing;

s5: adding a dispersing agent into the step S4, and stirring;

s6: adding pigment in the phase step S5, and stirring;

s7: grinding the mixed solution in the step S6 by using a grinder;

s8: adding calcium carbonate as a filler, barium sulfate, talcum powder, wax powder, a dispersing agent and a thickening agent into the mixed solution obtained in the step S7 in sequence, and stirring;

s9: performing secondary grinding on the mixed solution in the step S8 by using a grinding machine;

s10: adding a solvent into the step S9, and stirring;

s11: and filtering the mixed liquid in the step S10 to obtain the LED curing pad printing ink for the plastic material.

Preferably, the stirring device in the manufacturing step is specifically a dispersion machine, and the rotation speed of the dispersion machine is 800-.

Preferably, the grinder in the step S7 and the step S9 is a three-roll grinder, and the grinding fineness is less than or equal to 5 mu.

Preferably, the filter cloth mesh number of the step S11 is 300 meshes.

Compared with the prior art, the invention provides the LED curing pad printing ink for the plastic material, which has the following beneficial effects:

1. the light-emitting diode (LED) curing pad printing ink for plastic materials is characterized in that 2, 4, 6-trimethylbenzoyl-diphenyl phosphine oxide, bis (2, 4, 6-trimethylbenzoyl) phenyl phosphine oxide, 2-methyl-1- (4-methylthiophenyl) -2-morpholine-1-acetone and 2-isopropyl thioxanthone are used as photoinitiators which have an absorption effect on ultraviolet light at the wavelength of 250-400nm, so that the curing range of the pad printing ink is wide, mercury lamps, halogen lamps and light-emitting diode (LED) lamps can be used for curing, hyperbranched polyester acrylate used has low viscosity and very large functionality, and end groups have reactive groups, so that a certain viscosity reduction effect is achieved in the printing ink, the ink is beneficial to grinding and dispersion, and the printing ink can be rapidly cured due to the high functionality and reactive groups, the polyester acrylate has the characteristics of low odor and low irritation, and has good wettability and flexibility, so that the curing rate can be improved when the ink is used in color ink, meanwhile, the novolac epoxy acrylate used has the advantages of high benzene ring density, high rigidity, good heat resistance and good chemical resistance, so that the pad printing font of the pad printing ink is fine, the line width can reach 0.2mm, the RCA friction resistance can reach more than 45 times, the solvent used can play a role in diluting the ink and dissolving the initiator, and the ink residue on the surface of the rubber head is less than 10%, the ink transfer amount is high, and the font is clear and full after the rubber head is used for pad printing the font.

The parts which are not involved in the device are the same as or can be realized by the prior art, compared with the prior art, the curing range of the invention is wide, the curing can be realized by using a mercury lamp, a halogen lamp and an LED lamp, simultaneously, the pad printing font of the pad printing ink is fine, the line width can reach 0.2mm, the RCA friction resistance can reach more than 45 times, and after the printing ink is used for pad printing the font on a silica gel head, the residual quantity of the printing ink on the surface of the silica gel head is less than 10 percent, the transfer quantity of the printing ink is high, and the font is clear and full.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.