CN113583529A - Aqueous coating liquid, preparation method thereof and application of aqueous coating liquid in UV ink printing - Google Patents
Aqueous coating liquid, preparation method thereof and application of aqueous coating liquid in UV ink printing Download PDFInfo
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- CN113583529A CN113583529A CN202110907807.3A CN202110907807A CN113583529A CN 113583529 A CN113583529 A CN 113583529A CN 202110907807 A CN202110907807 A CN 202110907807A CN 113583529 A CN113583529 A CN 113583529A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D133/00—Coating 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
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- Inks, Pencil-Leads, Or Crayons (AREA)
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Abstract
The invention provides an aqueous coating liquid which comprises the following raw materials in parts by weight: acrylic resin: 18-35 parts of a solvent; polyurethane resin: 15-30 parts of a solvent; nano SiO2Aqueous dispersion: 1-4 parts; modifying agent: 1.5-5 parts; photoinitiator (2): 0.01-0.06 part; leveling agent: 0.3-0.6 part; water: 60-85 parts. The precoating layer formed by the water-based coating liquid plays a role of a medium, one surface of an object bonded by the precoating layer is a non-polar film and has good bonding force on the film, the other surface of the object is a printing carrier of UV ink, and the printing carrier has strong strength on a UV ink printing layerThe adhesiveness of (2). The aqueous coating liquid for UV ink digital printing provided by the invention can solve the problem of deinking caused by poor adhesion force in UV ink printing. The invention also provides a preparation method of the aqueous coating liquid and application of the aqueous coating liquid in UV ink printing.
Description
Technical Field
The invention belongs to the technical field of water-based coatings, and particularly relates to a water-based coating liquid, a preparation method thereof and application thereof in UV ink printing.
Background
The UV ink is a rapidly-developed green environment-friendly ink, and compared with thermosetting and volatile drying ink and other types of ink, the UV ink has the characteristics of low-temperature rapid curing, no volatile organic solvent, less pollution, small occupied area, high efficiency, low energy consumption and the like. UV inks will be a major alternative to traditional inks.
The fields of application which are currently predominant include label printing, container printing, and packaging cardboard printing. UV printing inks have also been applied to many different printing plate types, typically including wet offset, letterpress, screen printing and flexography. Gravure printing is less applicable. Printing substrates are also increasing, and UV printing inks can be used for printing on substrates of paper, wood, plastic, metal, etc. However, for technical reasons, most of the UV inks on the market currently have certain problems in terms of adhesion and curing, and especially, when the UV inks are printed on film products with low interface free energy (such as PET, PP, PVC, and the like), poor adhesion of the inks on a substrate (capable of being torn off by using transparent adhesive) occurs due to the reasons of not only surface tension of the substrate, but also incompatibility of a system of the base coat and the UV inks, and simultaneously, because the UV inks are cured too fast, stress is generated on the base coat, so that the adhesion between the UV ink layer and the base coat layer is very poor, a phenomenon of de-inking easily occurs, and even after the UV inks are finally prepared into finished products, the surface coating can be stripped off between the coating layers.
Disclosure of Invention
The invention aims to provide an aqueous coating liquid, a preparation method thereof and application thereof in UV ink printing.
The invention provides an aqueous coating liquid which comprises the following raw materials in parts by weight:
acrylic resin: 18-35 parts of a solvent;
polyurethane resin: 15-30 parts of a solvent;
nano SiO2Aqueous dispersion: 1-4 parts;
modifying agent: 1.5-5 parts;
photoinitiator (2): 0.01-0.06 part;
leveling agent: 0.3-0.6 part;
water: 60-85 parts.
Preferably, the acrylic resin is one or more of methacrylic acid, isooctyl acrylate, hydroxyethyl methacrylate and ethylene ethyl acrylate.
Preferably, the polyurethane resin is prepared by reacting organic polyisocyanate and oligomeric polyol;
the oligomeric polyol is 800-1000 polyethylene glycol.
Preferably, the nano SiO2The aqueous dispersion contains SiO with the particle size of 10-30 nm2Particles of said SiO2The purity of the particles was 99%.
Preferably, the modifier is one or more of polyethyleneimine, polymethyl methacrylate or polyvinyl alcohol.
Preferably, the modifier is prepared by mixing polyethyleneimine, polymethyl methacrylate and polyvinyl alcohol according to a mass ratio of 3:5: 13.4.
Preferably, the photoinitiator is one or more of ITX, EDB, 907 and TPO;
the flatting agent is one or more of acetylene glycol, organic silicon and organic polysiloxane polyether.
The present invention provides a method for preparing an aqueous coating liquid as described above, comprising the steps of:
mixing acrylic resin, polyurethane resin and water, and sequentially adding nano SiO under stirring2And stirring the aqueous dispersion, the modifier and the photoinitiator for 10-30 min, and adding the leveling agent to obtain the aqueous coating liquid.
Preferably, the aqueous coating solution according to claim 1 is applied to the surface of a substrate, dried, and then subjected to UV printing.
Preferably, the coating weight dry weight of the aqueous coating liquid is 1-10 g/m2。
The invention provides an aqueous coating liquid which comprises the following raw materials in parts by weight: acrylic resin: 18-35 parts of a solvent; polyurethane resin: 15-30 parts of a solvent; nano SiO2Aqueous dispersion: 1-4 parts; modifying agent: 1.5-5 parts; photoinitiator (2): 0.01-0.06 part; leveling agent: 0.3-0.6 part; water: 60-85 parts. The aqueous coating liquid of the present invention comprises a film base and an emulsion copolymer film-forming substance. The coating surface is a UV ink printing surface, and the aim is to enable the precoating layer to play a role of a medium, one surface of an object to be adhered by the precoating layer is a non-polar film and has better adhesive force to the film, and the other surface of the object is a printing carrier of UV ink and has stronger adhesiveness to the UV ink printing layer. The aqueous coating liquid for UV ink digital printing provided by the invention can solve the problem of deinking caused by poor adhesion force in UV ink printing.
Detailed Description
The invention provides an aqueous coating liquid which comprises the following raw materials in parts by weight:
acrylic resin: 18-35 parts of a solvent;
polyurethane resin: 15-30 parts of a solvent;
nano SiO2Aqueous dispersion: 1-4 parts;
modifying agent: 1.5-5 parts;
photoinitiator (2): 0.01-0.06 part;
leveling agent: 0.3-0.6 part;
water: 60-85 parts.
In the invention, the acrylic resin is preferably one or more of methacrylic acid, isooctyl acrylate, hydroxyethyl methacrylate and ethylene ethyl acrylate; the acrylic resin is preferably 18 to 35 parts by weight, more preferably 20 to 30 parts by weight, such as 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts and 35 parts by weight, and preferably any of the above values is a range with an upper limit or a lower limit.
In the present invention, the polyurethane resin is prepared by reacting an organic polyisocyanate, preferably one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and polyphenyl polymethylene polyisocyanate (PAPI), with an oligomeric polyol; the molecular weight of the oligomeric polyol is preferably 800-1000, and more preferably 850-950; the oligomeric polyol is preferably polyethylene glycol.
The weight portion of the polyurethane resin is preferably 15 to 30 parts, more preferably 18 to 25 parts, such as 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, and preferably any of the above values is a range with an upper limit or a lower limit.
In the invention, the nano SiO2The aqueous dispersion comprises nano SiO2Particles and water; the nano SiO2The particle diameter of the particles is preferably 20nm, and the nano SiO2The mass concentration of the particles is preferably 99%. The nano SiO2The weight part of the aqueous dispersion is preferably 1 to 4 parts, and more preferably 2 to 3 parts.
The nano silicon dioxide aqueous dispersion has spectrum mobility, a blue shift phenomenon that the spectrum peak of nano particles moves to a short wave direction due to the quantum size effect of nano particles occurs, and in addition, due to the existence of a huge interface, a large number of defects exist in the interface of the nano silicon dioxide particles, a plurality of high-concentration color centers are formed, so that the nano particles present a plurality of strong or new light absorption bands and have strong absorption effect on ultraviolet rays. Therefore, the UV ink is initiated and cured by ultraviolet light in the printing process, and the coating is basically not damaged, so that the adhesive force of the UV ink and the precoating film is better. Meanwhile, the nano dispersion can reduce the residual stress of the coating in the drying process, thereby enhancing the adhesion of the coating.
In the invention, the modifier is preferably one or more of polyethyleneimine, polymethyl methacrylate or polyvinyl alcohol; more preferably, the material is prepared by mixing polyethyleneimine, polymethyl methacrylate and polyvinyl alcohol according to the mass ratio of 3:5: 13.4; the modifier functions to provide repulsive forces to counter van der waals attractive forces to stabilize the state of the functional aqueous nanosilica dispersion. The weight portion of the modifier is preferably 1.5 to 5 parts, more preferably 2 to 4 parts, such as 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts and 5 parts, and preferably any of the above values is a range value with an upper limit or a lower limit.
In the present invention, the photoinitiator is preferably one or more of thioxanthone photoinitiator ITX, ethyl p-N, N-dimethylaminobenzoate EDB, 907 and TPO; the photoinitiator not only can improve the quick curing capability of the UV ink, but also has the performance of improving the ultraviolet resistance of a product, and the weight part of the photoinitiator is preferably 0.01-0.06 part, more preferably 0.02-0.05 part, such as 0.01 part, 0.02 part, 0.03 part, 0.04 part, 0.05 part and 0.06 part, and preferably the range value with any value as the upper limit or the lower limit.
The flatting agent is one or more of alkynediol, organic silicon and organopolysiloxane polyether; the weight part of the leveling agent is preferably 0.3-0.6 part, and more preferably 0.4-0.5 part.
The water is preferably soft water, the weight portion of the water is preferably 60 to 85 parts, more preferably 65 to 80 parts, such as 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts, 76 parts, 77 parts, 78 parts, 79 parts, 80 parts, 81 parts, 82 parts, 83 parts, 84 parts, 85 parts, and preferably a range value with any value as an upper limit or a lower limit.
In the invention, the solid content of the aqueous coating liquid is preferably 15-20%.
The invention also provides a preparation method of the aqueous coating liquid, which comprises the following steps:
mixing acrylic resin, polyurethane resin and water, and sequentially adding nano SiO under stirring2And stirring the aqueous dispersion, the modifier and the photoinitiator for 10-30 min, and adding the leveling agent to obtain the aqueous coating liquid.
Preferably, the acrylic resin, the polyurethane resin and the water are mixed, and then the stirring is started, and thenSequentially adding nano SiO under stirring2And continuously stirring the aqueous dispersion, the modifier and the photoinitiator for 10-30 min, then closing the stirring device, standing for 20-30 h, starting stirring, adding the leveling agent, and uniformly stirring to obtain the aqueous coating liquid.
In the invention, the stirring speed is preferably 50-150 r/min, more preferably 80-120 r/min, and most preferably 100-110 r/min, and the stirring time is preferably 3-8 min, more preferably 4-7 min, and most preferably 5-6 min.
The invention also provides an application of the aqueous coating liquid in UV ink printing, which comprises the following specific steps:
the aqueous coating liquid described above is applied to the surface of a substrate, dried to form a pre-coating layer on the surface of the substrate, and then UV-printed on the surface of the pre-coating layer.
In the invention, the coating weight dry weight of the aqueous coating liquid is preferably 1-10 g/m2More preferably 3 to 8g/m2Most preferably 4 to 5g/m2。
The invention provides an aqueous coating liquid which comprises the following raw materials in parts by weight: acrylic resin: 18-35 parts of a solvent; polyurethane resin: 15-30 parts of a solvent; nano SiO2Aqueous dispersion: 1-4 parts; modifying agent: 1.5-5 parts; photoinitiator (2): 0.01-0.06 part; leveling agent: 0.3-0.6 part; water: 60-85 parts. The aqueous coating liquid of the present invention comprises a film base and an emulsion copolymer film-forming substance. The coating surface is a UV ink printing surface, and the aim is to enable the precoating layer to play a role of a medium, one surface of an object to be adhered by the precoating layer is a non-polar film and has better adhesive force to the film, and the other surface of the object is a printing carrier of UV ink and has stronger adhesiveness to the UV ink printing layer. The aqueous coating liquid for UV ink digital printing provided by the invention can solve the problem of deinking caused by poor adhesion force in UV ink printing.
In order to further illustrate the present invention, the following detailed description of an aqueous coating solution, a preparation method thereof and an application thereof in UV ink printing is provided with reference to examples, but the present invention should not be construed as limiting the scope of the present invention.
In the following examples, the modifier is prepared by mixing polyethyleneimine, polymethyl methacrylate and polyvinyl alcohol according to a mass ratio of 3:5: 13.4.
Example 1
Mixing 18 parts by weight of acrylic resin, 15 parts by weight of polyurethane resin and 60 parts by weight of soft water, starting stirring, stirring at the speed of 100r/min for 5min, sequentially adding 1 part by weight of nano-silica aqueous dispersion, 1.5 parts by weight of modifier and 0.01 part by weight of photoinitiator at normal temperature, continuously stirring for 20min, standing for 24h, and adding 0.3 part by weight of flatting agent under stirring until the mixture is uniform to obtain the aqueous coating liquid for UV ink digital printing.
Through detection, the solid content of the aqueous coating liquid for digital printing of the UV ink provided in embodiment 1 of the present invention is 15%; coating the PVC substrate by a 300-mesh wire-mesh roller, wherein the dry weight of the coating is 3g/m2And obtaining a sample after UV printing, wherein the adhesive force reaches grade 1 of the standard GB/T5210-1985.
Example 2
Mixing 20 parts by weight of acrylic resin, 25 parts by weight of polyurethane resin and 65 parts by weight of soft water, starting stirring, stirring at the speed of 100r/min for 5min, sequentially adding 2.5 parts by weight of nano-silica aqueous dispersion, 3 parts by weight of modifier and 0.04 part by weight of photoinitiator at normal temperature, continuously stirring for 20min, standing for 24h, and adding 0.4 part by weight of flatting agent under stirring until the mixture is uniform, namely the aqueous coating liquid for UV ink digital printing.
Through detection, the solid content of the aqueous coating liquid for digital printing of the UV ink provided in embodiment 1 of the present invention is 20%; coating the PVC substrate by a 300-mesh wire-mesh roller, wherein the dry weight of the coating is 5g/m2And obtaining a sample after UV printing, wherein the adhesive force reaches 0 grade of the standard GB/T5210-1985.
Example 3
Mixing 35 parts by weight of acrylic resin, 30 parts by weight of polyurethane resin and 85 parts by weight of soft water, starting stirring, stirring at the speed of 100r/min for 5min, sequentially adding 4 parts by weight of nano-silica aqueous dispersion, 5 parts by weight of modifier and 0.06 part by weight of photoinitiator at normal temperature, continuously stirring for 20min, standing for 24h, and adding 0.6 part by weight of flatting agent under stirring until the mixture is uniform, namely the aqueous coating liquid for UV ink digital printing.
Through detection, the solid content of the aqueous coating liquid for digital printing of the UV ink provided in embodiment 1 of the present invention is 18%; coating the PVC substrate by a 300-mesh screen roller, wherein the dry weight of the coating is 4.5g/m2And obtaining a sample after UV printing, wherein the adhesive force reaches grade 1 of the standard GB/T5210-1985.
Comparative example 1
The preparation process provided in example 1 was used with the difference that: no nanosilica aqueous dispersion is added; the test adhesion force reaches grade 2 of the standard GB/T5210-1985.
Comparative example 2
The preparation process provided in example 1 was used with the difference that: no modifier is added; the test adhesion force reaches grade 2 of the standard GB/T5210-1985.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An aqueous coating liquid comprises the following raw materials in parts by weight:
acrylic resin: 18-35 parts of a solvent;
polyurethane resin: 15-30 parts of a solvent;
nano SiO2Aqueous dispersion: 1-4 parts;
modifying agent: 1.5-5 parts;
photoinitiator (2): 0.01-0.06 part;
leveling agent: 0.3-0.6 part;
water: 60-85 parts.
2. The aqueous coating solution according to claim 1, wherein the acrylic resin is one or more selected from methacrylic acid, isooctyl acrylate, hydroxyethyl methacrylate and ethyl ethylene acrylate.
3. The aqueous coating solution according to claim 1, wherein the polyurethane resin is obtained by reacting an organic polyisocyanate and an oligomeric polyol;
the oligomeric polyol is polyethylene glycol with the molecular weight of 800-1000.
4. The aqueous coating solution as claimed in claim 1, wherein the nano SiO is2The aqueous dispersion contains SiO with the particle size of 10-30 nm2Particles of said SiO2The purity of the particles was 99%.
5. The aqueous coating solution according to claim 1, wherein the modifier is one or more selected from polyethyleneimine, polymethyl methacrylate, and polyvinyl alcohol.
6. The aqueous coating solution as defined in claim 5, wherein the modifier is prepared by mixing polyethyleneimine, polymethyl methacrylate and polyvinyl alcohol in a mass ratio of 3:5: 13.4.
7. The aqueous coating solution according to claim 1, wherein the photoinitiator is one or more of ITX, EDB, 907, and TPO;
the flatting agent is one or more of acetylene glycol, organic silicon and organic polysiloxane polyether.
8. The method for preparing an aqueous coating liquid according to claim 1, comprising the steps of:
mixing acrylic resin, polyurethane resin and water, and sequentially adding nano SiO under stirring2And stirring the aqueous dispersion, the modifier and the photoinitiator for 10-30 min, and adding the leveling agent to obtain the aqueous coating liquid.
9. Use of the aqueous coating solution according to claim 1 for UV ink printing, wherein the aqueous coating solution according to claim 1 is applied to a substrate surface, dried and then subjected to UV printing.
10. The use according to claim 9, wherein the aqueous coating liquid is applied in an amount of 1 to 10g/m in dry weight2。
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Cited By (4)
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| CN115449244A (en) * | 2022-09-05 | 2022-12-09 | 苏州海顺包装材料有限公司 | Water-based primer coating for PTP and PTP cover film |
| CN116589732A (en) * | 2023-04-26 | 2023-08-15 | 江苏康辉新材料科技有限公司 | A kind of BOPP precoat film and preparation method of enhancing UV ink adhesion |
| WO2024074807A1 (en) * | 2022-10-07 | 2024-04-11 | Sun Chemical B.V. | Primers for digital printing |
| TWI862907B (en) * | 2022-03-22 | 2024-11-21 | 正隆股份有限公司 | Environmentally friendly non-wax water-resistant coating preparation method and paper product using the coating |
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