阅读说明：本技术 一种环保水性柔印uv油墨 (Environment-friendly water-based UV (ultraviolet) printing ink for flexography ) 是由 韩琪 李进 董留彬 余尚军 赵祥 于 2019-12-20 设计创作，主要内容包括：本发明公开了一种环保水性柔印UV油墨,其特征在于,是由下述质量分数的成分制备而成的：UV固化水性共混树脂30～60％、光引发剂4～36％、活性稀释剂2～8％；去离子水3～10％、有机颜料1～2％、分散剂2～3％、防粘剂0.5～1％、抗刮剂0.5～1％、助溶剂15～20％；所述UV固化水性共混树脂由聚碳酸酯基聚氨酯丙烯酸酯和硅烷基改性丙烯酸酯树脂共混而成,所述聚碳酸酯聚氨酯丙烯酸酯和硅烷基改性丙烯酸酯树脂两者共混比例为0.5～1.2:2.5～3.5；所述光引发剂由2-羟基-甲基苯基丙烷-1-酮、1-羟基-环己基-苯基甲酮、2-苯基苄2-二甲基胺-1-(4-吗啉苄苯基)丁酮和2-甲基1-(4-甲硫基苯基)-2-吗啉基-1-丙酮四种化合物混合而成。(The invention discloses an environment-friendly water-based flexo printing UV ink which is characterized by being prepared from the following components in percentage by mass: 30-60% of UV curing water-based blending resin, 4-36% of photoinitiator and 2-8% of reactive diluent; 3-10% of deionized water, 1-2% of organic pigment, 2-3% of dispersant, 0.5-1% of anti-sticking agent, 0.5-1% of anti-scraping agent and 15-20% of cosolvent; the UV-cured water-based blended resin is formed by blending polycarbonate-based polyurethane acrylate and silyl-modified acrylate resin, wherein the blending ratio of the polycarbonate-based polyurethane acrylate to the silyl-modified acrylate resin is 0.5-1.2: 2.5-3.5; the photoinitiator is prepared by mixing four compounds of 2-hydroxy-methyl phenyl propane-1-ketone, 1-hydroxy-cyclohexyl-phenyl ketone, 2-benzyl 2-dimethylamine-1- (4-morpholine benzyl phenyl) butanone and 2-methyl 1- (4-methylthiophenyl) -2-morpholinyl-1-acetone.)

1. The environment-friendly water-based flexo printing UV ink is characterized by being prepared from the following components in percentage by mass: 30-60% of UV curing water-based blending resin, 4-36% of photoinitiator and 2-8% of reactive diluent; 3-10% of deionized water, 1-2% of organic pigment, 2-3% of dispersant, 0.5-1% of anti-sticking agent, 0.5-1% of anti-scraping agent and 15-20% of cosolvent; the UV-cured water-based blended resin is formed by blending polycarbonate-based polyurethane acrylate and silyl-modified acrylate resin, wherein the blending ratio of the polycarbonate-based polyurethane acrylate to the silyl-modified acrylate resin is 0.5-1.2: 2.5-3.5; the photoinitiator is prepared by mixing four compounds of 2-hydroxy-methyl phenyl propane-1-ketone, 1-hydroxy-cyclohexyl-phenyl ketone, 2-benzyl 2-dimethylamine-1- (4-morpholine benzyl phenyl) butanone and 2-methyl 1- (4-methylthiophenyl) -2-morpholinyl-1-acetone.

2. The environmentally friendly aqueous flexographic UV ink according to claim 1, wherein said photoinitiator is a mixture of four compounds 1:1:1 of 2-hydroxy-methylphenylpropane-1-one, 1-hydroxy-cyclohexyl-phenyl ketone, 2-phenylbenzyl 2-dimethylamine-1- (4-morpholinebenzyl phenyl) butanone and 2-methyl 1- (4-methylthiophenyl) -2-morpholinyl-1-propanone.

3. The environment-friendly aqueous flexo UV ink according to claim 2, wherein the polycarbonate-based polyurethane acrylate takes polycarbonate diol as a soft segment, reacts with silane-based modified acrylate resin to generate a prepolymer, and a photo-curing functional monomer is connected to the chain end to synthesize the ultraviolet photo-curing polycarbonate-based polyurethane acrylate.

4. The environmentally friendly aqueous flexographic UV ink according to claim 3, characterized in that said reactive diluent comprises a mixture of ethoxyethoxyethyl acrylate, tripropylene glycol diacrylate, 1, 6-hexanediol diacrylate, diethylene glycol diacrylate phthalate, isoborneol acrylate, trimethylolpropane triacrylate and neopentyl glycol diacrylate.

5. The environment-friendly aqueous flexo UV ink according to claim 4, wherein the amount of ethoxyethoxyethyl acrylate is 8-10%, tripropylene glycol diacrylate is 18-20%, 1, 6-hexanediol diacrylate is 15-20%, diethylene glycol diacrylate is 28-30%, isobornyl acrylate is 15-30%, trimethylolpropane triacrylate is 10-20%, and neopentyl glycol diacrylate is 3-8%.

6. The environmentally friendly aqueous flexographic UV ink according to claim 1, characterized in that said dispersant is a dispersant having a polyisobutylene succinic anhydride structure.

7. The environmentally friendly aqueous flexographic UV ink according to claim 1, characterized in that said dispersant is the reaction product of an organic diepoxide or polyepoxide with a primary amine, an amino alcohol, an amino acid, a hydroxy acid or an alcohol containing a fused or non-fused aromatic imide group.

8. The environmentally friendly aqueous flexographic UV ink according to claim 1, characterized in that said detackifier consists of a solvent oil, a modified polysiloxane and a sorbitan fatty acid ester.

9. The environment-friendly aqueous flexographic UV ink according to claim 8, characterized in that the mass fractions of the solvent oil, the modified polysiloxane and the sorbitan fatty acid ester in the anti-sticking agent are 22 to 28 wt%, 30 to 40 wt% and 30 to 50 wt%.

10. The environmentally friendly aqueous flexographic UV ink according to claim 1, wherein said scratch resistant agent comprises a polyvinyl fluoride wax and a silicone; the mixing ratio of the polyvinyl fluoride wax to the organic silicon is 1-2: 3.

Technical Field

The invention relates to the technical field of printing ink, in particular to environment-friendly water-based UV printing ink for flexography.

Background

In the formula of the flexible printing water-based UV ink, the requirement of printability needs to be met, and the requirement of the use performance of a packing material needs to be met, so that the components of the formula need to be reasonably selected. In the flexible printing water-based UV ink, the main components comprise an oligomer, a photoinitiator, a pigment and an auxiliary agent. At present, a large number of novel water-based UV printing inks applied to screen printing appear at home and abroad. The oligomer used in many studies of aqueous UV inks is mostly a resin or a copolymer and requires the use of reactive monomers. However, the active monomers have certain volatility and are harmful to the environment and human health. In the selection of the oligomer, two esters of polyether acrylate and polyurethane acrylate are blended, the process is simple, the environment-friendly and non-toxic is realized, the curing speed is high, the adhesive force is good, and the water resistance and the wear resistance of the coating film are poor. At present, the conventional oil-based ink uses an organic solvent (toluene, xylene, industrial alcohol, etc.) as a solvent. In the flexible package industry, the solvent type ink mainly adopts volatile drying, so that the lower the boiling point of the solvent is, the more volatile the solvent is and releases toxic gas to pollute the environment, and residual toxic substances are also on the surface of the solvent after printing is finished. Therefore, the environment-friendly ink is a popular product in the current printing industry, and various ink manufacturers develop the product, but the structure and components of the current product cannot meet the use conditions of the current product, so that the problem that the product is slow in drying speed or cannot be dried at all occurs, and the problem needs to be improved and solved.

Disclosure of Invention

Aiming at the defects, the invention aims to provide the environment-friendly water-based flexo printing UV ink which has high solid content, good fullness, stable printing quality, good stretching and good rebound resilience.

The technical scheme of the invention is summarized as follows: the environment-friendly water-based flexo printing UV ink is characterized by being prepared from the following components in percentage by mass: 30-60% of UV curing water-based blending resin, 4-36% of photoinitiator and 2-8% of reactive diluent; 3-10% of deionized water, 1-2% of organic pigment, 2-3% of dispersant, 0.5-1% of anti-sticking agent, 0.5-1% of anti-scraping agent and 15-20% of cosolvent; the UV-cured water-based blended resin is formed by blending polycarbonate-based polyurethane acrylate and silyl-modified acrylate resin, wherein the blending ratio of the polycarbonate-based polyurethane acrylate to the silyl-modified acrylate resin is 0.5-1.2: 2.5-3.5; the photoinitiator is prepared by mixing four compounds of 2-hydroxy-methyl phenyl propane-1-ketone, 1-hydroxy-cyclohexyl-phenyl ketone, 2-benzyl 2-dimethylamine-1- (4-morpholine benzyl phenyl) butanone and 2-methyl 1- (4-methylthiophenyl) -2-morpholinyl-1-acetone.

In some embodiments, the photoinitiator is a mixture of four compounds 1:1:1:1, 2-hydroxy-methylphenylpropane-1-one, 1-hydroxy-cyclohexyl-phenylmethanone, 2-phenylbenzyl 2-dimethylamine-1- (4-morpholinebenzyl phenyl) butanone, and 2-methyl 1- (4-methylthiophenyl) -2-morpholino-1-propanone.

In some embodiments, the polycarbonate-based polyurethane acrylate takes polycarbonate diol as a soft segment, reacts with silane-based modified acrylate resin to generate a prepolymer, and is connected with a photo-curing functional monomer at a chain end to synthesize the ultraviolet-curing polycarbonate-based polyurethane acrylate.

In some embodiments, the reactive diluent comprises a mixture of ethoxyethoxyethyl acrylate, tripropylene glycol diacrylate, 1, 6-hexanediol diacrylate, diethylene glycol diacrylate phthalate, isoborneol acrylate, trimethylolpropane triacrylate, and neopentyl glycol diacrylate.

In some embodiments, 8-10% of ethoxyethoxyethyl acrylate, 18-20% of tripropylene glycol diacrylate, 15-20% of 1, 6-hexanediol diacrylate, 28-30% of diethylene glycol diacrylate phthalate, 15-30% of isobornyl acrylate, 10-20% of trimethylolpropane triacrylate, and 3-8% of neopentyl glycol diacrylate.

In some embodiments, the dispersant is a dispersant having a polyisobutylene succinic anhydride structure.

In some embodiments, the dispersant is the reaction product of an organic diepoxide or polyepoxide and a primary amine, aminoalcohol, amino acid, hydroxy acid, or alcohol containing a fused or non-fused aromatic imide group.

In some embodiments, the detackifier consists of a mineral spirit, a modified polysiloxane, and a sorbitan fatty acid ester.

In some embodiments, the anti-sticking medium solvent oil, the modified polysiloxane and the sorbitan fatty acid ester form 22-28 wt%, 30-40 wt% and 30-50 wt% of the mass fraction.

In some embodiments, the scratch resistant agent comprises a polyvinyl fluoride wax and a silicone; the mixing ratio of the polyvinyl fluoride wax to the organic silicon is 1-2: 3.

The invention has the beneficial effects that:

(1) the environment-friendly water-based flexographic UV ink disclosed by the invention uses PCDL-PUA as matrix resin, and is mixed with silane-based modified acrylate resin, the organic silicon modified acrylate resin has excellent gloss retention and color retention, is not easy to pulverize, and has good gloss, meanwhile, due to the good flexibility of PCDL-PUA molecular chains, the formed ink has good elasticity and good chemical resistance, and in addition, an active diluent, a photoinitiator and the like are added, so that the obtained ink has excellent curing property, drying property and smoothness, and good release property on water, namely an alcohol solvent, the drying property in the use process is thoroughly solved, the lubricating property and the film forming property of a pigment are well improved, and the printing speed is improved.

(2) In the environment-friendly water-based flexo UV ink, the absorption spectrum of the photoinitiator designed and used by the invention is matched with the radiation spectrum of a light source, and simultaneously matched with the pigment of the ink, namely the absorption peak of the photoinitiator is in the 'spectral region' range of the pigment, so that the curing speed of the ink is high, and the printing performance and the printing quality are very high.

(3) The environment-friendly water-based flexo UV ink has high toner content and is difficult to disperse, so the environment-friendly water-based flexo UV ink can effectively improve the grinding efficiency, the coloring strength and the paint film gloss and can also increase the fluidity by selecting a dispersing agent with strong dispersing capacity.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

The scheme provides an environment-friendly water-based flexo printing UV ink which is prepared from the following components in percentage by mass: 30-60% of UV curing water-based blending resin, 4-36% of photoinitiator and 2-8% of reactive diluent; 3-10% of deionized water, 1-2% of organic pigment, 2-3% of dispersant, 0.5-1% of anti-sticking agent, 0.5-1% of anti-scraping agent and 15-20% of cosolvent; in the invention, the UV-curing water-based blended resin is formed by blending polycarbonate-based polyurethane acrylate (PCDL-PUA) and silane-based modified acrylate resin, wherein the blending ratio of the polycarbonate-based polyurethane acrylate (PCDL-PUA) to the silane-based modified acrylate resin is 0.5-1.2: 2.5-3.5; the photoinitiator is prepared by mixing four compounds of 2-hydroxy-methyl phenyl propane-1-ketone, 1-hydroxy-cyclohexyl-phenyl ketone, 2-benzyl 2-dimethylamine-1- (4-morpholine benzyl phenyl) butanone and 2-methyl 1- (4-methylthiophenyl) -2-morpholinyl-1-acetone. In the invention, PCDL-PUA is used as matrix resin and is mixed with silane-based modified acrylate resin, the organic silicon modified acrylate resin has excellent gloss retention, color retention, difficult pulverization and good gloss, meanwhile, because the molecular chain of the PCDL-PUA has good flexibility, the formed ink has good elasticity and good chemical resistance, and active diluent, photoinitiator and the like are added, so that the obtained ink has excellent curing property, drying property and smoothness, has good release property on water, namely alcohol solvent, thoroughly solves the drying property in the use process, simultaneously improves the lubricating property and film forming property of pigment, and improves the printing speed.

Further preferably, in this embodiment of the present invention, the photoinitiator is a mixture of four compounds 1:1:1:1 of 2-hydroxy-methylphenylpropane-1-one, 1-hydroxy-cyclohexyl-phenylmethanone, 2-phenylbenzyl 2-dimethylamine-1- (4-morpholinylbenzyl) butanone and 2-methyl-1- (4-methylthiophenyl) -2-morpholinyl-1-propanone. It is known that in UV inks, the curing speed is an important issue, and UV inks are cured by means of a photoinitiator which forms free radicals or cations upon absorption of radiation, which initiates polymerization, crosslinking and grafting reactions of monomers and prepolymers to form a crosslinked polymer with a three-dimensional network structure. In the invention, the absorption spectrum of the photoinitiator designed and used by the invention is matched with the radiation spectrum of a light source, and simultaneously is matched with the pigment of the ink, namely the absorption peak of the photoinitiator is in the range of the 'spectral region' of the pigment, so that the curing speed of the ink is high, and the printing performance and the printing quality are very high.

Specifically, in the invention, the polycarbonate-based polyurethane acrylate takes polycarbonate diol as a soft segment, reacts with silane-based modified acrylate resin to generate a prepolymer, and is connected with a photocuring functional monomer at the chain end to synthesize the ultraviolet-curing polycarbonate-based polyurethane acrylate. As a further preference, in this embodiment of the invention, the reactive diluent comprises a mixture of ethoxyethoxyethyl acrylate, tripropylene glycol diacrylate, 1, 6-hexanediol diacrylate, diethylene glycol diacrylate phthalate, isoborneol acrylate, trimethylolpropane triacrylate and neopentyl glycol diacrylate. Specifically, 8-10% of ethoxy ethyl acrylate, 18-20% of tripropylene glycol diacrylate, 15-20% of 1, 6-hexanediol diacrylate, 28-30% of phthalic acid diethylene glycol diacrylate, 15-30% of isobornyl acrylate, 10-20% of trimethylolpropane triacrylate and 3-8% of neopentyl glycol diacrylate.

As a further preference, in this embodiment of the invention, the dispersant is a dispersant having a polyisobutylene succinic anhydride structure. Alternatively, in another embodiment of the invention, the dispersant is the reaction product of an organic diepoxide or polyepoxide and a primary amine, aminoalcohol, amino acid, hydroxy acid, or alcohol containing a fused or non-fused aromatic imide group. In the UV offset printing ink, the content of the toner is high, and the toner is difficult to disperse, so that the dispersing agent with high dispersing capacity is selected, the grinding efficiency, the coloring strength and the paint film gloss can be effectively improved, and the fluidity can be increased.

As further preferred, in this embodiment of the present invention, the antiblocking agent is composed of a mineral spirit, a modified polysiloxane, and a sorbitan fatty acid ester. Specifically, the mass fractions of the anti-sticking medium solvent oil, the modified polysiloxane and the sorbitan fatty acid ester are 22-28 wt%, 30-40 wt% and 30-50 wt%.

As a further preference, the anti-scraping agent is a mixture of polyvinyl fluoride wax and silicone; the mixing ratio of the polyvinyl fluoride wax to the organic silicon is 1-2: 3. In addition, in the invention, the cosolvent is selected for volatilization drying, so that the drying property of the ink is improved.

The specific examples listed below: