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CN-122011834-A - UV-LED curing offset printing ink, preparation method and application thereof

CN122011834ACN 122011834 ACN122011834 ACN 122011834ACN-122011834-A

Abstract

The invention discloses UV-LED curing offset ink which is characterized by comprising, by mass, 40-60 parts of an oligomer, 10-30 parts of an active monomer, 5-15 parts of a photoinitiator, 20-50 parts of a pigment filler and 0.1-2 parts of an auxiliary agent. The invention also discloses a preparation method and application thereof. The UV-LED curing offset printing ink disclosed by the invention has the advantages of good anti-emulsifying property, good transferability, high curing speed, low odor and good adhesion to gold and silver paperboard.

Inventors

  • BAO JUN
  • YU YALEI

Assignees

  • 康达新材料(集团)股份有限公司

Dates

Publication Date
20260512
Application Date
20251201

Claims (10)

  1. 1. The UV-LED curing offset printing ink is characterized by comprising the following components in parts by weight: 40-60 parts of oligomer; 10-30 parts of active monomer; 5-15 parts of photoinitiator; 20-50 parts of pigment filler; 0.1-2 parts of auxiliary agent; the oligomer is any one or more of polyester acrylate, polyurethane acrylate, polyether acrylate, epoxy acrylate, chlorinated polyester acrylate, modified rosin ester acrylate and amine modified acrylate; The active monomer is any one or more of 1, 4-hexanediol diacrylate, trimethylolpropane triacrylate, dipropylene glycol diacrylate, triethylene glycol diacrylate, cyclotrimethylolpropane methylacrylate, (n-ethoxylation) trimethylolpropane triacrylate, di (trimethylolpropane) triacrylate, acrylic acid triol, dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate; The photoinitiator is any one or more of acyl phosphorus oxide photoinitiator, alpha-hydroxy alkyl benzene ketone photoinitiator, benzil derivative photoinitiator, thioxanthone photoinitiator or benzophenone and derivative photoinitiator thereof.
  2. 2. A UV-LED curing flexo ink according to claim 1, wherein the oligomer is a mixture of polyester acrylate resin and epoxy acrylate resin in a mixing ratio of 20:40 to 10:12.
  3. 3. A UV-LED curing flexographic ink according to claim 1, wherein the reactive monomer is a mixture of trimethylolpropane triacrylate and dipropylene glycol diacrylate, a mixture of trimethylolpropane triacrylate and dipentaerythritol hexaacrylate, or trimethylolpropane triacrylate.
  4. 4. A UV-LED curable flexographic ink, according to claim 1, The acylphosphorus oxide photoinitiator is 2,4, 6-trimethylbenzoyl-diphenyl phosphorus oxide (TPO) or phenyl bis (2, 4, 6-trimethylbenzoyl) phosphorus oxide (819); The alpha-hydroxy alkyl benzophenone photoinitiator is any one or more of 2-hydroxy-2-methyl-1-phenyl-1-acetone (1173), 1-hydroxy-cyclohexyl-phenyl ketone (184) and 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone (2959). In a preferred embodiment of the present invention, the α -aminoalkyl benzophenone photoinitiator is any one or more of 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -1-butanone (369), 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholino-1-propanone (907), 2-dimethylamino-2-benzyl-1- [4- (4-morpholino) phenyl ] -1-butanone (379); the benzil derivative photoinitiator is alpha, alpha-dimethyl benzil ketal (BDK); The thioxanthone photoinitiator is any one or more of 2, 4-diisopropyl thioxanthone (ITX), 2-Chloro Thioxanthone (CTX) and 2, 4-diethyl thioxanthone (DETX); the diphenyl ketone and the derivative photoinitiator thereof are 4,4' -bis (dimethylamino) diphenyl ketone (EMK).
  5. 5. The UV-LED curing flexographic ink according to claim 4, wherein said photoinitiator is: 2,4, 6-trimethylbenzoyl-diphenyl phosphorus oxide, Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -1-butanone, 1-Hydroxy-cyclohexyl-phenyl-methanone, 2, 4-Diethyl thioxanthone, Phenyl bis (2, 4, 6-trimethylbenzoyl) phosphorus oxide, Any one or more of 4,4' -bis (dimethylamino) benzophenone.
  6. 6. A UV-LED curable flexographic ink, according to claim 1, The organic pigment is one or more of benzidine yellow, permanent yellow, golden red, lispro red, phthalocyanine blue, alkaline blue, phthalocyanine green and carbazole violet; The filler is one or more of fumed silica, nano calcium carbonate, talcum powder, kaolin and micro wax powder; the auxiliary agent is any one or more of wetting dispersing agent, polymerization inhibitor or stabilizer, the dispersing agent is high molecular weight block copolymer solution containing pigment affinity group, and the polymerization inhibitor is one or more of phenols, arylamines and aromatic hydroxyl nitro compounds.
  7. 7. A UV-LED curable flexographic ink, according to claim 1, The UV-LED light source is one or more of 365nm, 385nm or 395 nm.
  8. 8. The UV-LED curing flexographic ink according to claim 1, further comprising 0-2 parts of a photosensitizer, wherein the photosensitizer is a tertiary amine photosensitizer.
  9. 9. A method of preparing a UV-LED curable flexographic ink according to any one of claims 1 to 8, comprising the steps of: And completely dissolving the photoinitiator and/or the photosensitizer in the active monomer, adding the oligomer, the pigment filler and the auxiliary agent after completely dissolving and uniformly stirring, firstly stirring at a low speed (200-300 rpm), and then stirring at a high speed (800-1000 rpm) after the pigment filler is mixed into the resin mixed solution until completely and uniformly stirring, and then grinding on a three-roller machine until the grinding fineness is less than or equal to 10 mu m, thereby obtaining the UV-LED offset white ink after reaching the standard.
  10. 10. Use of a UV-LED curable flexo ink according to any one of claims 1 to 8, wherein the use is suitable for gift packaging of UV-LED curable flexo inks.

Description

UV-LED curing offset printing ink, preparation method and application thereof Technical Field The invention relates to the technical field of printing ink, in particular to UV-LED curing offset printing ink, a preparation method and application thereof. Background Offset printing is a lithographic printing mode based on the principle of water-oil incompatibility. The UV offset printing ink has wide application in high-grade package printing due to the characteristics of instant solidification, high efficiency, high gloss, excellent resistance and the like. It generally consists of photoinitiators, oligomers, reactive monomers, pigments, fillers and auxiliaries. The presently disclosed UV offset inks are primarily enhanced in gloss and cure speed through the use of epoxy acrylate oligomers and TMPTA monomers. However, in order to pursue curing efficiency, such UV offset inks often use a large amount of small molecule photoinitiators (e.g. benzophenones) and low molecular weight reactive monomers. These materials tend to separate out from the ink film of the UV offset ink after curing, migrate to the surface of the packaged food, and present a potential health risk. In addition, if the photoinitiator is used in the UV offset ink to reduce migration, the UV offset ink is not cured thoroughly, the ink layer is sticky, and the abrasion resistance is reduced. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide UV-LED curing offset printing ink, a preparation method and application thereof. Compared with the existing UV-LED curing offset ink, the UV-LED curing offset ink has the advantages of good anti-emulsifying property, good transfer property and high curing speed. The UV-LED curing offset printing ink comprises the following components in parts by weight: 40-60 parts of oligomer; 10-30 parts of active monomer; 5-15 parts of photoinitiator; 20-50 parts of pigment filler; 0.1-2 parts of auxiliary agent; in a preferred embodiment of the present invention, the oligomer is any one or more of polyester acrylate, polyurethane acrylate, polyether acrylate, epoxy acrylate, chlorinated polyester acrylate, modified rosin ester acrylate, amine modified acrylate. Preferably, the mixture of the polyester acrylate resin and the epoxy acrylate resin is mixed in a ratio of 20:40-10:12. In a preferred embodiment of the present invention, the reactive monomer is any one or more of 1, 4-hexanediol diacrylate, trimethylolpropane triacrylate, dipropylene glycol diacrylate, triethylene glycol diacrylate, cyclotrimethylolpropane methylacrylate, (n-ethoxylated) trimethylolpropane triacrylate, di (trimethylolpropane) triacrylate, acrylate glycerol, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate. Preferably a mixture of trimethylolpropane triacrylate and dipropylene glycol diacrylate, a mixture of trimethylolpropane triacrylate and dipentaerythritol hexaacrylate, or trimethylolpropane triacrylate. More preferably, the mixing ratio of the trimethylolpropane triacrylate to the dipropylene glycol diacrylate is 5:3. More preferably, the mixing ratio of the trimethylolpropane triacrylate to the dipentaerythritol hexaacrylate is 9-10:5. In a preferred embodiment of the present invention, the photoinitiator is any one or more of an acyl phosphorus oxide photoinitiator, an α -hydroxy alkyl benzophenone photoinitiator, a benzil derivative type photoinitiator, a thioxanthone type photoinitiator, or a benzophenone and its derivative type photoinitiator. In a preferred embodiment of the present invention, the acylphosphorus oxide photoinitiator is 2,4, 6-trimethylbenzoyl-diphenyl phosphorus oxide (TPO) or phenyl bis (2, 4, 6-trimethylbenzoyl) phosphorus oxide (819). In a preferred embodiment of the present invention, the α -hydroxyalkylbenzophenone photoinitiator is any one or more of 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), 1-hydroxy-cyclohexyl-phenyl-methanone (184), 2-hydroxy-4' - (2-hydroxyethoxy) -2-methylpropenone (2959). In a preferred embodiment of the present invention, the α -aminoalkyl benzophenone photoinitiator is any one or more of 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -1-butanone (369), 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholino-1-propanone (907), 2-dimethylamino-2-benzyl-1- [4- (4-morpholino) phenyl ] -1-butanone (379). In a preferred embodiment of the present invention, the benzil derivative photoinitiator is α, α -dimethylbenzoyl ketal (BDK). In a preferred embodiment of the present invention, the thioxanthone photoinitiator is any one or more of 2, 4-diisopropylthioxanthone (ITX), 2-Chlorothioxanthone (CTX), 2, 4-Diethylthioxanthone (DETX). In a preferred embodiment of the present invention, the benzophenone and its derivative class of photoinitiators is 4,4' -bis (dimethylamino) benzophenone (EMK). Preferably 2,4, 6-trimethylbenzoyl-diphenyl phosphorus oxide, 3-Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -1-butanone, 1-Hydroxy-cy