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CN108329777B - Water-based varnish composition for UV offset printing and preparation method thereof - Google Patents

Water-based varnish composition for UV offset printing and preparation method thereof Download PDF

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Publication number
CN108329777B
CN108329777B CN201711478625.9A CN201711478625A CN108329777B CN 108329777 B CN108329777 B CN 108329777B CN 201711478625 A CN201711478625 A CN 201711478625A CN 108329777 B CN108329777 B CN 108329777B
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offset printing
varnish composition
emulsion
water
agent
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CN108329777A (en
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董海普
刘冲
戴胜杰
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Shanghai Weikai Optoelectronic New Materials Co Ltd
Shanghai Chengying New Material Co Ltd
Jiangsu Chengying New Material Co Ltd
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Shanghai Weikai Optoelectronic New Materials Co Ltd
Shanghai Chengying New Material Co Ltd
Jiangsu Chengying New Material Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04Homopolymers or copolymers of esters

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention provides an aqueous varnish composition for UV offset printing and a preparation method thereof, wherein the varnish comprises the following components: UV reaction monomer, polyurethane emulsion, acrylate emulsion, solvent, slipping agent, wax emulsion, wetting agent and defoaming agent. The preparation method of the water-based varnish composition for UV offset printing comprises the following steps: uniformly mixing the acrylate emulsion, the polyurethane emulsion and the UV reaction monomer, and adding a solvent; and (3) uniformly mixing, adding a slipping agent, a wax emulsion, a wetting agent and a defoaming agent, stirring at the rotating speed of 1100-1300 rpm, and filtering to obtain the water-based varnish composition for UV offset printing. The invention has the following beneficial effects: 1. the environment-friendly water-based paint has low volatile organic compounds; 2. the coating is tightly combined with the UV ink, and the adhesion is good; 3. the coating has high hardness and no risk of flower adhesion during high-temperature storage; 4. the coating has good film forming toughness, and can not be broken when being extruded or stretched after being coated with the ink.

Description

Water-based varnish composition for UV offset printing and preparation method thereof
Technical Field
The invention relates to an aqueous varnish composition for UV offset printing and a preparation method thereof, belonging to the technical field of UV curing coatings.
Background
The UV offset printing has the characteristics of smooth printing surface effect, good texture, gorgeous color and high saturation after printing, and the printing ink for the UV offset printing has the characteristics of quick drying, good wear resistance, no solvent, no emission and the like, so the UV offset printing is widely applied to the fields of tobacco packaging, wine and medicine packaging and food packaging. The UV offset printing mainly comprises two steps of coating varnish and UV curing of printing offset printing ink, and the current offset printing varnish is divided into two systems: the coating has the characteristic of good ink adhesion, but the solvent can corrode and dissolve a transfer coating on a substrate to generate undercut and pollute the environment; secondly, the solvent of the water-based varnish is mainly water and ethanol, and the VOC emission is low, so that the water-based varnish is one of the mainstream of the development nowadays. Common water-based varnish generally has soft property due to pursuing adhesive force with ink, so that the pressure-resistant flower and temperature-resistant property of a coating is not ideal enough, and the phenomena of flower and white generation can occur during rolling and storage.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide an aqueous varnish composition for UV offset printing and a preparation method thereof.
The invention is realized by the following technical scheme:
the invention provides an aqueous varnish composition for UV offset printing, which comprises the following components in parts by weight:
Figure BDA0001533339730000011
Figure BDA0001533339730000021
preferably, the UV reaction monomer is a hydrophilic monomer, the functionality is 2-5, and the content of the polymerization inhibitor is 200-400 ppm.
Preferably, the lowest film-forming temperature of the polyurethane emulsion is not more than 30 ℃, the elongation at break is 150-200%, and the solid content is 35%.
Preferably, the glass transition temperature of the acrylate emulsion is not lower than 90 ℃, the surface tension is 40-50 DA, the viscosity is not more than 500mpa · s, and the solid content is 50%.
Preferably, the solvent is one or two of ethanol and water.
Preferably, the slipping agent is polyether modified organic silicon.
Preferably, the wax emulsion is one or more of polyethylene wax, polytetrafluoroethylene wax and polypropylene wax;
preferably, the defoaming agent is one or more of polyether modified siloxane, vegetable oil and mineral oil;
preferably, the wetting agent is one or two of acetylene glycol and polyether modified silicone.
In a second aspect, the present invention also provides a method for preparing the aqueous varnish composition for UV offset printing as described above, which comprises the steps of:
uniformly mixing the acrylate emulsion, the polyurethane emulsion and the UV reaction monomer, and adding a solvent;
and (3) uniformly mixing, adding a slipping agent, a wax emulsion, a wetting agent and a defoaming agent, stirring at the rotating speed of 1100-1300 rpm, and then passing through a 250-mesh filter screen to obtain the water-based varnish composition for UV offset printing.
Generally, when the UV ink is cured, an inward stress is generated by ink shrinkage, so that the bonding strength between the UV ink layer and the varnish is insufficient, and the adhesion is affected. When UV offset printing ink is coated, a UV lamp is used for irradiating, double bonds on the UV reaction monomer on the surface layer of the varnish and double bonds of UV resin in the printing ink can be broken and cross-linked and cured mutually, so that a varnish layer and a printing ink layer are combined more tightly, the printing ink is attached better, and on the basis, a hard acrylic emulsion can be added, and the hardness of the coating is increased by the acrylic emulsion, so that the scratch resistance and the pressure-resistant pattern performance can be improved; in addition, the polyurethane emulsion increases the film forming toughness of the coating and ensures that the coating cannot be broken under certain stretching.
Compared with the prior art, the invention has the following beneficial effects:
1. the environment-friendly water-based paint has low volatile organic compounds;
2. the coating was tightly bound to the UV ink with good adhesion.
3. The coating has high hardness and no risk of flower adhesion during high-temperature storage.
4. The coating has good film forming toughness, and can not be broken when being extruded or stretched after being coated with the ink.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
TABLE 1
UV reactive monomer 1
Polyurethane emulsion 20
Acrylic ester emulsion 44
Ethanol: water 3:1 34
Slipping agent 0.1
Wax emulsion 1
Wetting agent 0.2
Defoaming agent 0.2
The formulation of the aqueous varnish composition for UV offset printing of this example is shown in Table 1, and the preparation method comprises the following steps:
uniformly mixing the acrylate emulsion, the polyurethane emulsion and the UV reaction monomer, and adding a solvent;
and (3) uniformly mixing, adding a slipping agent, a wax emulsion, a wetting agent and a defoaming agent, stirring at the rotating speed of 1100-1300 rpm, and then passing through a 250-mesh filter screen to obtain the water-based varnish composition for UV offset printing.
Example 2
TABLE 2
Figure BDA0001533339730000031
Figure BDA0001533339730000041
The formulation of the water base varnish composition for UV offset printing of this example is shown in Table 2, and the preparation method is the same as that of example 1.
Example 3
TABLE 3
UV reactive monomer 3
Polyurethane emulsion 28.5
Acrylic ester emulsion 34
Ethanol: 2:1 of water 32.5
Slipping agent 0.1
Wax emulsion 2
Wetting agent 0.1
Defoaming agent 0.1
The formulation of the water base varnish composition for UV offset printing of this example is shown in Table 3, and the preparation method is the same as that of example 1.
Example 4
TABLE 4
Figure BDA0001533339730000042
Figure BDA0001533339730000051
The formulation of the water base varnish composition for UV offset printing of this example is shown in Table 4, and the preparation method is the same as that of example 1.
Example 5
TABLE 5
UV reactive monomer 5
Polyurethane emulsion 35
Acrylic ester emulsionLiquid for treating urinary tract infection 26
Ethanol: 2:1 of water 30
Slipping agent 0.1
Wax emulsion 4
Wetting agent 0.1
Defoaming agent 0.1
The formulation of the water base varnish composition for UV offset printing of this example is shown in Table 5, and the preparation method is the same as that of example 1.
Comparative example 1
TABLE 6
UV reactive monomer 1
Polyurethane emulsion 28.5
Acrylic ester emulsion 34
Ethanol: 2:1 of water 34.5
Slipping agent 0.1
Wax emulsion 2
Wetting agent 0.1
Defoaming agent 0.1
The formulation of the aqueous varnish composition for UV offset printing of this comparative example is shown in Table 6, and the preparation method is the same as in example 1.
Comparative example 2
TABLE 7
UV reactive monomer 3
Polyurethane emulsion 22
Acrylic ester emulsion 34
Ethanol: 2:1 of water 39
Slipping agent 0.1
Wax emulsion 2
Wetting agent 0.1
Defoaming agent 0.1
The formulation of the aqueous varnish composition for UV offset printing of this comparative example is shown in Table 7, and the preparation method is the same as in example 1.
Comparative example 3
TABLE 8
UV reactive monomer 3
Polyurethane emulsion 28.5
Acrylic ester emulsion 26
Ethanol: 2:1 of water 40.5
Slipping agent 0.1
Wax emulsion 2
Wetting agent 0.1
Defoaming agent 0.1
The formulation of the aqueous varnish composition for UV offset printing of this comparative example is shown in Table 8, and the preparation method is the same as in example 1.
Example 6
Adhesion, embossing resistance, folding resistance test
Preparing a sample sheet A: the film on the surface of the transfer silver card was torn to expose the transfer layer, and then the paints of comparative example and examples 1 to 5 were coated on a BOPP laser aluminized film by a wuckel 4# wire bar and dried at 120 ℃ for 10 s.
Preparing a sample sheet B: uniformly coating UV ink on the sample A by using a glue stick, and then putting the sample A into a UV machine for curing with the curing energy of 150
And (3) testing the adhesive force: testing the adhesive force of the ink by adopting a check method: a plurality of cross-shaped square squares with the same size were scribed on the UV offset ink layer of the sample sheet B with a sharp blade, and the cut was made to the substrate, and then, the substrate was brushed five times each in the diagonal direction with a brush, and the cut was stuck with a 3M tape and pulled apart, and the ink adhesion was observed.
Pressure-resistant flower test: the swatches A were cut into 30 squares of 2cm by 2cm, sandwiched between two pieces of 1dm by 1dm toughened glass, and a 5KG weight was added to the glass (care was taken to keep the balance) and then placed in a thermostatic oven at 50 ℃ and the time to tack and bloom of the swatches was observed and recorded.
And (3) folding endurance test: and folding the sample sheet B back and forth by 180 degrees, and observing and recording the times required by the ink cracking on the sample sheet B.
TABLE 9
Figure BDA0001533339730000071
And (3) analyzing a test result:
as shown in table 9, in comparative example 3 and comparative examples 1, 2 and 3, UV reaction monomers, polyurethane emulsions and acrylate emulsions were reduced, respectively, and it was found that UV reaction monomers and polyurethane emulsions have excellent accelerating effects on varnish adhesion and folding resistance; and the acrylic ester emulsion can effectively improve the pressure-resistant performance.
From the final results, examples 3 and 4 also had good folding endurance while ensuring high adhesion and embossing endurance.
In combination with the analysis, the invention develops the water-based varnish coating for UV offset printing, which is mainly characterized in that a UV reaction monomer and polyurethane emulsion are added, so that the product can be added with more hard acrylic acid to improve the pressure-resistant printing performance under the conditions of stronger adhesion and good folding resistance, and has good VOCs (volatile organic chemicals) and obvious advantages compared with the common water-based and solvent-based UV offset printing coatings on the market.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims (8)

1. The water-based varnish composition for UV offset printing is characterized by comprising the following components in parts by weight:
Figure FDA0002625722940000011
the polyurethane emulsion has the minimum film-forming temperature of no more than 30 ℃, the elongation at break of 150-200% and the solid content of 35%; the glass transition temperature of the acrylate emulsion is not lower than 90 ℃, the surface tension is 40-50 dyn/cm, the viscosity is not more than 500mpa · s, and the solid content is 50%.
2. The water-based varnish composition for UV offset printing according to claim 1, wherein the UV reactive monomer is a hydrophilic monomer, the functionality is 2 to 5, and the content of the polymerization inhibitor is 200 to 400 ppm.
3. The aqueous varnish composition for UV offset printing according to claim 1, wherein the solvent is one or both of ethanol and water.
4. The aqueous varnish composition for UV offset printing according to claim 1, wherein the slip agent is a polyether-modified silicone.
5. The aqueous varnish composition for UV offset printing according to claim 1, wherein the wax emulsion is one or more of polyethylene wax, polytetrafluoroethylene wax, and polypropylene wax.
6. The aqueous varnish composition for UV offset printing according to claim 1, wherein the defoaming agent is one or more of polyether-modified silicone, vegetable oil and mineral oil.
7. The aqueous varnish composition for UV offset printing according to claim 1, wherein the wetting agent is one or both of an acetylene glycol type and a polyether-modified silicone type.
8. A method for producing the aqueous varnish composition for UV offset printing according to claim 1, comprising the steps of:
uniformly mixing the acrylate emulsion, the polyurethane emulsion and the UV reaction monomer, and adding a solvent;
and (3) uniformly mixing, adding a slipping agent, a wax emulsion, a wetting agent and a defoaming agent, stirring at the rotating speed of 1100-1300 rpm, and then passing through a 250-mesh filter screen to obtain the water-based varnish composition for UV offset printing.
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CN109679476B (en) * 2018-12-28 2021-05-28 上海乘鹰新材料有限公司 PET film surface water-based varnish for Indigo printing and preparation method thereof
CN113004852B (en) * 2019-12-19 2022-07-19 中钞特种防伪科技有限公司 Composition for preparing hot melt adhesive, hot melt adhesive and application thereof
CN114106605A (en) * 2021-12-02 2022-03-01 江苏顺泰包装印刷科技有限公司 Water-based varnish with strong adhesive force and suitable for UV printing and preparation system thereof
CN114922000A (en) * 2022-06-17 2022-08-19 南京百聚科技有限公司 Paper coating water-based varnish and preparation method thereof
CN116285543B (en) * 2023-05-25 2023-08-08 广东德冠薄膜新材料股份有限公司 Reinforced UV (ultraviolet) ink printing film and preparation method thereof

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Publication number Priority date Publication date Assignee Title
JP2006206802A (en) * 2005-01-31 2006-08-10 Toyo Ink Mfg Co Ltd Aqueous coating composition and printed matter using the same
CN103509450A (en) * 2012-06-21 2014-01-15 中国科学院化学研究所 Primer for waterless offset printing plate making, preparation method and application thereof
CN105368231A (en) * 2015-12-09 2016-03-02 杭华油墨股份有限公司 Water-based under coating varnish used before UV curable varnish printing, and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006206802A (en) * 2005-01-31 2006-08-10 Toyo Ink Mfg Co Ltd Aqueous coating composition and printed matter using the same
CN103509450A (en) * 2012-06-21 2014-01-15 中国科学院化学研究所 Primer for waterless offset printing plate making, preparation method and application thereof
CN105368231A (en) * 2015-12-09 2016-03-02 杭华油墨股份有限公司 Water-based under coating varnish used before UV curable varnish printing, and preparation method thereof

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