CN111892862B - Finishing varnish and preparation method thereof - Google Patents

Finishing varnish and preparation method thereof Download PDF

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Publication number
CN111892862B
CN111892862B CN202010737279.7A CN202010737279A CN111892862B CN 111892862 B CN111892862 B CN 111892862B CN 202010737279 A CN202010737279 A CN 202010737279A CN 111892862 B CN111892862 B CN 111892862B
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acrylic resin
titanium dioxide
nano titanium
finishing varnish
alcohol
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CN111892862A (en
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万想
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Shanghai Lanbao Paint Co ltd
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Shanghai Lanbao Paint Co ltd
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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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
    • 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
    • C09D7/20—Diluents or solvents
    • 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
    • C09D7/47—Levelling agents
    • 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
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • 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
    • C09D7/63—Additives non-macromolecular organic
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation

Abstract

The application relates to a finishing varnish and a preparation method thereof, relating to the technical field of coatings, wherein the finishing varnish comprises the following components: 9-13 kg of polyurethane acrylic resin, 15-20 kg of polyester acrylic resin, 15-20 kg of trimethylolpropane triacrylate, 7.5-10.5 kg of dipentaerythritol hexaacrylate, 37-47 kg of solvent, 1-4 kg of photoinitiator and 0.3-0.7 kg of flatting agent; the preparation method comprises the following steps: 1) feeding; 2) dispersing; 3) mixing paint; 4) checking; 5) and packaging and warehousing. The application has the effect of improving poor adhesion of the finishing varnish coating.

Description

Finishing varnish and preparation method thereof
Technical Field
The application relates to the technical field of coatings, in particular to a finishing varnish and a preparation method thereof.
Background
The photo-curing coating is also called photosensitive coating, and is a coating which takes ultraviolet light as a coating curing energy source and can be rapidly cured to form a film on substrates such as paper, plastics, leather, wood and the like under the condition of no heating. The finishing varnish is commonly called gloss oil, has very high use frequency in model making and is used for improving the brightness of finished products. In fact, the application range of the finishing varnish is very wide, the finishing varnish is commonly used for automobile surface coating, exterior wall coating and the like, and the finishing varnish can also be used for cosmetic packaging box surface coating. The finishing varnish has multiple purposes, and can play a role in protecting, resisting oxidation, resisting corrosion and the like when being used for coating the surface of the cosmetic packaging box.
The existing finishing varnish also uses UV light-cured coating, but the coating formed by curing the UV coating has poor adhesive force and is easy to fall off in the using process, so that the cosmetic packaging box has reduced aesthetic property and shortened service life.
Disclosure of Invention
In order to improve the defect of poor adhesion of the coating of the finishing varnish, the application provides the finishing varnish and a preparation method thereof.
In a first aspect, the present application provides an overcoat varnish, which adopts the following technical scheme:
an overprint varnish comprising the following components: 9-13 kg of polyurethane acrylic resin, 15-20 kg of polyester acrylic resin, 15-20 kg of trimethylolpropane triacrylate, 7.5-10.5 kg of dipentaerythritol hexaacrylate, 37-47 kg of solvent, 1-4 kg of photoinitiator and 0.3-0.7 kg of flatting agent.
By adopting the technical scheme, the acrylic resin is modified by using polyurethane, and the prepared polyurethane acrylic resin contains acrylic acid functional groups and urethane bonds in the molecular structure, has high wear resistance, adhesive force, flexibility and excellent low-temperature resistance of polyurethane, and also has excellent optical performance and weather resistance of polyacrylate, so that the photocuring efficiency is improved, the adhesion of varnish is improved, and the possibility of peeling of a cured coating is reduced. The polyester has good toughness, the polyester acrylic resin prepared by using the polyester modified acrylic acid has good toughness, the polyester acrylic resin has good compatibility with the polyurethane acrylic resin, the polyester acrylic resin and the polyurethane acrylic resin are cooperatively matched, and in addition, the trimethylolpropane triacrylate and the dipentaerythritol hexaacrylate are subjected to cross-linking reaction with the two monomers to form a compact three-dimensional reticular molecular structure, so that the adhesion performance of the finishing varnish is improved, the adhesion of a cured coating is further improved, and the peeling risk of the cured coating is reduced.
Preferably, the finishing varnish comprises the following components: 11kg of polyurethane acrylic resin, 17kg of polyester acrylic resin, 18kg of trimethylolpropane triacrylate, 9kg of dipentaerythritol hexaacrylate, 42kg of solvent, 2.5kg of photoinitiator and 0.5kg of leveling agent.
By adopting the technical scheme, the finishing varnish prepared from the raw materials in parts by mass has excellent adhesion performance, and the cured coating has strong adhesion and is not easy to fall off.
Preferably, the solvent comprises 9-11 kg of toluene, 9-11 kg of acetone, 9-11 kg of butyl acetate, 7-9 kg of ethyl acetate and 3-5 kg of diacetone alcohol.
By adopting the technical scheme, the blending property among toluene, acetone, butyl acetate, ethyl acetate and diacetone alcohol is good, and the acrylic resin has good compatibility with polyurethane acrylic resin, polyester acrylic resin, trimethylolpropane triacrylate and dipentaerythritol hexaacrylate, so that the components are uniformly dispersed in the solvent, the bonding of the components is reduced, and the quality of the finishing varnish is ensured.
Preferably, the solvent comprises 10kg of toluene, 10kg of butyl acetate, 10kg of ethyl acetate, 8kg of acetone and 4kg of diacetone alcohol.
By adopting the technical scheme, the finishing varnish prepared by adopting the solvent in parts by mass has excellent physical and chemical properties, particularly good adhesion, high coating curing efficiency and difficult shedding.
Preferably, the finishing varnish further comprises 3-5 kg of nano titanium dioxide dispersion liquid.
By adopting the technical scheme, the nano titanium dioxide dispersion liquid is added into the component system to improve the viscosity of the system on one hand, so that the adhesion property of the finishing varnish is improved; on the other hand, the oxidation resistance of the finishing varnish is improved, so that the cured coating of the finishing varnish is not easy to yellow in the long-term use process.
Preferably, the preparation method of the nano titanium dioxide dispersion liquid comprises the following steps: 1) preparing an alcohol-water solution: weighing ethanol and pure water according to the mass ratio of 19:1, and preparing an alcohol-water solution; 2) weighing 20 parts of nano titanium dioxide, 0.08 part of KH-5703 part of triphosphite and 0.07 part of glacial acetic acid according to the parts by weight; 3) dispersing the nano titanium dioxide in an alcohol-water solution at 60 ℃, completely immersing the nano titanium dioxide in the alcohol-water solution, adding KH-570 into the alcohol-water solution, and reacting at constant temperature for 6 hours; 4) adding triphosphite into the dispersion liquid obtained in the step 3), and then placing the mixture into a magnetic stirrer to stir for 8-10 min to uniformly disperse the dispersion liquid; 5) and adding glacial acetic acid into the magnetic stirrer, and adjusting the pH value of the dispersion to 4.0-5.0 to prepare the nano titanium dioxide dispersion.
By adopting the technical scheme, the nano titanium dioxide has good dispersibility in the alcohol-water solution, the KH-570 is used for modifying the nano titanium dioxide so as to improve the comprehensive performance of the nano titanium dioxide, and the nano titanium dioxide is changed into transparent particles with smaller particle size so as to meet the use requirement of the finishing varnish; the triphosphite does not have the function of absorbing ultraviolet rays, but can capture active free radicals generated by photodegradation, decompose hydroperoxide and transfer the energy of excited molecules, and the triphosphite is matched with the nano titanium dioxide to ensure that the finishing varnish has good light stability.
Preferably, the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.
By adopting the technical scheme, the 1-hydroxycyclohexyl phenyl ketone is a high-efficiency photoinitiator and is used for an ultraviolet curing system, and the photoinitiator has the advantages of no yellowing for a long time and convenience in storage, so that the photoinitiator is used as a photoinitiator in the formulation of the finishing varnish.
Preferably, the leveling agent is polyether modified polydimethylsiloxane copolymer.
By adopting the technical scheme, the polyether modified polydimethylsiloxane copolymer has the effects of improving the surface tension of the finishing varnish and wetting a substrate, and simultaneously improves the surface smoothness and the glossiness of a cured coating.
In a second aspect, the present application provides a method for preparing an overcoat varnish, which adopts the following technical scheme:
a preparation method of an overprint varnish comprises the following steps:
1) feeding: weighing polyurethane acrylic resin, polyester acrylic resin, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, a solvent, a photoinitiator and a leveling agent according to weight, and putting the raw materials into a reaction kettle;
2) dispersing: increasing the stirring speed in the reaction kettle from 300rpm to 1000rpm at the speed of 100rpm/min, then stirring at a constant speed for 5min, then reducing the stirring speed from 1000rpm to 400rpm at the speed of 150rpm/min, and then stirring at a constant speed for 3-5 min to uniformly disperse the raw materials to obtain a primary finished product of the finishing varnish;
3) paint mixing: adjusting the viscosity of the primary finished product according to the viscosity specified by the work order technical index, and controlling the viscosity of the primary finished product within +/-5% of the specified viscosity to prepare a sample to be detected of the finishing varnish;
4) and (4) checking: inspecting the performance of a sample to be inspected of the finishing varnish according to the specification of a product standard, packaging qualified products, and re-mixing paint for unqualified products;
5) packaging and warehousing: and after the packaging is finished, the product is inspected again according to the packaging specification and the specification, the qualified product is warehoused and stored, and the unqualified product is packaged again.
Through adopting above-mentioned technical scheme, adopt the stirring mode of low rotational speed earlier high rotational speed at last low rotational speed at the in-process of dispersion raw materials for fully dispersed between each raw materials to this improves the cross-linking reaction effect, makes the finishing varnish of paper cup have more excellent adhesion properties.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the polyester acrylic resin and the polyurethane acrylic resin have good compatibility and are cooperated, and the two monomers, namely trimethylolpropane triacrylate and dipentaerythritol hexaacrylate, are subjected to crosslinking reaction with the polyester acrylic resin and the polyurethane acrylic resin to form a compact three-dimensional reticular molecular structure, so that the adhesion performance of the finishing varnish is improved, the adhesion of a cured coating is improved, and the peeling risk of the cured coating is reduced;
2. the blending property among toluene, acetone, butyl acetate, ethyl acetate and diacetone alcohol is good, and the acrylic resin has good compatibility with polyurethane acrylic resin, polyester acrylic resin, trimethylolpropane triacrylate and dipentaerythritol hexaacrylate, so that the components are uniformly dispersed in the solvent, the bonding of the components is reduced, and the quality of the finishing varnish is ensured;
3. adding the nano titanium dioxide dispersion liquid into the component system is used for improving the viscosity of the system on one hand, so that the adhesion performance of the finishing varnish is improved; on the other hand, the oxidation resistance of the finishing varnish is improved, so that the cured coating of the finishing varnish is not easy to yellow in the long-term use process.
Detailed Description
The embodiment of the application discloses finishing varnish and a preparation method thereof.
Example 1
The finishing varnish comprises the following components: 11kg of polyurethane acrylic resin, 17kg of polybutylene terephthalate acrylic resin, 18kg of trimethylolpropane triacrylate, 9kg of dipentaerythritol hexaacrylate, 10kg of toluene, 10kg of acetone, 10kg of butyl acetate, 8kg of ethyl acetate, 4kg of diacetone alcohol, 2.5kg of 1-hydroxycyclohexyl phenyl ketone and 0.5kg of polyether modified polydimethylsiloxane copolymer;
the preparation method of the finishing varnish comprises the following steps:
1) feeding: weighing polyurethane acrylic resin, polybutylene terephthalate acrylic resin, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, toluene, acetone, butyl acetate, ethyl acetate, diacetone alcohol, 1-hydroxycyclohexyl phenyl ketone and polyether modified polydimethylsiloxane copolymer according to weight, and putting the raw materials into a reaction kettle;
2) dispersing: the stirring speed in the reaction kettle is increased from 300rpm to 1000rpm at the speed of 100rpm/min, then stirred at a constant speed for 5min, then reduced from 1000rpm to 400rpm at the speed of 150rpm/min, and then stirred at a constant speed for 4min, so that the raw materials are uniformly dispersed, and a primary finished product of the finishing varnish is prepared;
3) paint mixing: adjusting the viscosity of the primary finished product according to the viscosity specified by the work order technical index, and controlling the viscosity of the primary finished product within +/-5% of the specified viscosity to prepare a sample to be detected of the finishing varnish;
4) and (4) checking: inspecting the performance of the sample to be inspected of the finishing varnish according to the specification of a product standard, packaging qualified products, and readjusting unqualified products;
5) packaging and warehousing: and after the packaging is finished, the product is inspected again according to the packaging specification and the specification, the qualified product is warehoused and stored, and the unqualified product is packaged again.
Example 2
The finishing varnish comprises the following components: 9kg of polyurethane acrylic resin, 15kg of polyethylene terephthalate acrylic resin, 15kg of trimethylolpropane triacrylate, 7.5kg of dipentaerythritol hexaacrylate, 9kg of toluene, 9kg of acetone, 9kg of butyl acetate, 7kg of ethyl acetate, 3kg of diacetone alcohol, 1kg of 1-hydroxycyclohexyl phenyl ketone and 0.3kg of polyether modified polydimethylsiloxane copolymer;
the preparation method of the finishing varnish comprises the following steps:
1) feeding: weighing polyurethane acrylic resin, polyethylene glycol terephthalate acrylic resin, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, toluene, acetone, butyl acetate, ethyl acetate, diacetone alcohol, 1-hydroxycyclohexyl phenyl ketone and polyether modified polydimethylsiloxane copolymer according to weight, and putting the raw materials into a reaction kettle;
2) dispersing: the stirring speed in the reaction kettle is increased from 300rpm to 1000rpm at the speed of 100rpm/min, then stirred at a constant speed for 5min, then reduced from 1000rpm to 400rpm at the speed of 150rpm/min, and then stirred at a constant speed for 3min, so that the raw materials are uniformly dispersed, and a primary finished product of the finishing varnish is prepared;
3) paint mixing: adjusting the viscosity of the primary finished product according to the viscosity specified by the work order technical index, and controlling the viscosity of the primary finished product within +/-5% of the specified viscosity to prepare a sample to be detected of the finishing varnish;
4) and (4) checking: inspecting the performance of the sample to be inspected of the finishing varnish according to the specification of a product standard, packaging qualified products, and readjusting unqualified products;
5) packaging and warehousing: and after the packaging is finished, the product is inspected again according to the packaging specification and the specification, the qualified product is warehoused and stored, and the unqualified product is packaged again.
Example 3
The finishing varnish comprises the following components: 13kg of polyurethane acrylic resin, 20kg of polyarylate acrylic resin, 20kg of trimethylolpropane triacrylate, 10.5kg of dipentaerythritol hexaacrylate, 11kg of toluene, 11kg of acetone, 11kg of butyl acetate, 9kg of ethyl acetate, 5kg of diacetone alcohol, 4kg of 1-hydroxycyclohexyl phenyl ketone and 7kg of polyether modified polydimethylsiloxane copolymer;
the preparation method of the finishing varnish comprises the following steps:
1) feeding: weighing polyurethane acrylic resin, polyarylate acrylic resin, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, toluene, acetone, butyl acetate, ethyl acetate, diacetone alcohol, 1-hydroxycyclohexyl phenyl ketone and polyether modified polydimethylsiloxane copolymer by weight, and putting the raw materials into a reaction kettle;
2) dispersing: the stirring speed in the reaction kettle is increased from 300rpm to 1000rpm at the speed of 100rpm/min, then stirred at a constant speed for 5min, then reduced from 1000rpm to 400rpm at the speed of 150rpm/min, and then stirred at a constant speed for 5min, so that the raw materials are uniformly dispersed, and a primary finished product of the finishing varnish is prepared;
3) paint mixing: adjusting the viscosity of the primary finished product according to the viscosity specified by the work order technical index, and controlling the viscosity of the primary finished product within +/-5% of the specified viscosity to prepare a sample to be detected of the finishing varnish;
4) and (4) checking: inspecting the performance of the sample to be inspected of the finishing varnish according to the specification of a product standard, packaging qualified products, and readjusting unqualified products;
5) packaging and warehousing: and after the packaging is finished, the product is inspected again according to the packaging specification and the specification, the qualified product is warehoused and stored, and the unqualified product is packaged again.
Example 4
The difference between the embodiment and the embodiment 1 is that the finishing varnish system also comprises 3kg of nano titanium dioxide dispersion liquid;
the preparation method of the nano titanium dioxide dispersion liquid comprises the following steps: 1) preparing an alcohol-water solution: weighing ethanol and pure water according to the mass ratio of 19:1, and preparing an alcohol-water solution; 2) weighing 20 parts of nano titanium dioxide, 0.08 part of KH-5703 part of triphosphite and 0.07 part of glacial acetic acid according to the parts by weight; 3) dispersing the nano titanium dioxide in an alcohol-water solution at 60 ℃, completely immersing the nano titanium dioxide in the alcohol-water solution, adding KH-570 into the alcohol-water solution, and reacting at constant temperature for 6 hours; 4) adding triphosphite into the dispersion liquid obtained in the step 3), and then placing the mixture into a magnetic stirrer to stir for 8min so as to uniformly disperse the dispersion liquid; 5) and adding glacial acetic acid into the magnetic stirrer, and adjusting the pH value of the dispersion to 4.0 to prepare the nano titanium dioxide dispersion.
Example 5
The difference between the embodiment and the embodiment 1 is that the finishing varnish system also comprises 4kg of nano titanium dioxide dispersion liquid;
the preparation method of the nano titanium dioxide dispersion liquid comprises the following steps: 1) preparing an alcohol-water solution: weighing ethanol and pure water according to the mass ratio of 19:1, and preparing an alcohol-water solution; 2) weighing 20 parts of nano titanium dioxide, 0.08 part of KH-5703 part of triphosphite and 0.07 part of glacial acetic acid according to the parts by weight; 3) dispersing the nano titanium dioxide in an alcohol-water solution at 60 ℃, completely immersing the nano titanium dioxide in the alcohol-water solution, adding KH-570 into the alcohol-water solution, and reacting at constant temperature for 6 hours; 4) adding triphosphite into the dispersion liquid obtained in the step 3), and then placing the mixture into a magnetic stirrer to stir for 9min so as to uniformly disperse the dispersion liquid; 5) and adding glacial acetic acid into the magnetic stirrer, and adjusting the pH value of the dispersion to 4.5 to prepare the nano titanium dioxide dispersion.
Example 6
The difference between the embodiment and the embodiment 1 is that the finishing varnish system also comprises 5kg of nano titanium dioxide dispersion liquid;
the preparation method of the nano titanium dioxide dispersion liquid comprises the following steps: 1) preparing an alcohol-water solution: weighing ethanol and pure water according to the mass ratio of 19:1, and preparing an alcohol-water solution; 2) weighing 20 parts of nano titanium dioxide, 0.08 part of KH-5703 part of triphosphite and 0.07 part of glacial acetic acid according to the parts by weight; 3) dispersing the nano titanium dioxide in an alcohol-water solution at 60 ℃, completely immersing the nano titanium dioxide in the alcohol-water solution, adding KH-570 into the alcohol-water solution, and reacting at constant temperature for 6 hours; 4) adding triphosphite into the dispersion liquid obtained in the step 3), and then placing the mixture into a magnetic stirrer to stir for 10min so as to uniformly disperse the dispersion liquid; 5) and adding glacial acetic acid into the magnetic stirrer, and adjusting the pH value of the dispersion to 5.0 to prepare the nano titanium dioxide dispersion.
Comparative example 1
This comparative example differs from example 1 in that polybutylene terephthalate acrylic resin is not included in the overprint varnish system.
Comparative example 2
This comparative example differs from example 1 in that the urethane acrylic resin is not included in the overprint varnish system.
Comparative example 3
This comparative example differs from example 1 in that trimethylolpropane triacrylate is not included in the overprint varnish component.
Comparative example 4
This comparative example differs from example 1 in that dipentaerythritol hexaacrylate is not included in the overprint varnish component.
Comparative example 5
This comparative example differs from example 1 in that trimethylolpropane triacrylate and dipentaerythritol hexaacrylate are not included in the overprint varnish component.
Comparative example 6
This comparative example differs from example 1 in that,
the preparation method of the finishing varnish comprises the following steps:
1) feeding: weighing polyurethane acrylic resin, polybutylene terephthalate acrylic resin, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, toluene, acetone, butyl acetate, ethyl acetate, diacetone alcohol, 1-hydroxycyclohexyl phenyl ketone and polyether modified polydimethylsiloxane copolymer according to weight, and putting the raw materials into a reaction kettle;
2) dispersing: stirring in the reaction kettle at a speed of 400rpm for 20min to disperse the raw materials uniformly to obtain a primary finished product of the finishing varnish;
3) paint mixing: adjusting the viscosity of the primary finished product according to the viscosity specified by the work order technical index, and controlling the viscosity of the primary finished product within +/-5% of the specified viscosity to prepare a sample to be detected of the finishing varnish;
4) and (4) checking: inspecting the performance of the sample to be inspected of the finishing varnish according to the specification of a product standard, packaging qualified products, and readjusting unqualified products;
5) packaging and warehousing: and after the packaging is finished, the product is inspected again according to the packaging specification and the specification, the qualified product is warehoused and stored, and the unqualified product is packaged again.
Performance test
The overprint varnishes prepared in examples 1 to 6 and comparative examples 1 to 6 were sampled, 12 groups of samples were uniformly applied to the surfaces of the same 12 groups of substrates, and after the overprint varnish on the substrate surfaces was cured, the cured coatings were subjected to the following performance test tests.
1. And (3) detecting the adhesion performance:
detection test one: GB/T9286-1998 grid test for paint films of color paint and varnish is adopted to detect the paint layer adhesion performance of the sample, and the detection result is recorded in Table 1;
and (3) peeling grade evaluation:
level 0: the product is completely smooth, and no lattice falls off;
level 1: small paint layers are peeled off at the crossed part, and the influence area is not more than 5 percent;
and 2, stage: the crossing points are stripped along the edges, and the influence area is 5-15%;
and 3, level: large fragments or all fragments are peeled off along the edge, and the influence area is 15-35%;
4, level: the whole lattice is peeled off along the edge, and some lattices are partially or completely peeled off, so that the influence area is 35-65%;
and 5, stage: any exfoliation rating greater than 4;
and (4) detection test II: the samples were tested for paint adhesion using the GB/T6742-2007 test for bending of paints and varnishes, the samples were bent using a shaft of a specified diameter and inspected for cracking or peeling of the coating from the substrate under sufficient light conditions, and the results are reported in Table 1.
2. And (3) detecting the curing performance:
adopting HG/T3655-2012 to detect whether the curing rate of the coating is qualified or not, wherein the detection standard is 55 ℃ multiplied by 5-7min/700-2The measurements are recorded in table 1.
TABLE 1
Sample (I) Peel rating of lattice test Results of bending test Rate of cure
Example 1 1 2-4 cracks Qualified
Example 2 2 4-6 cracks Qualified
Example 3 2 4-6 cracks Qualified
Example 4 0 1 to 3 cracks Qualified
Example 5 0 Does not crack Qualified
Example 6 0 1 to 3 cracks Qualified
Comparative example 1 4 9-12 cracks Fail to be qualified
Comparative example 2 3 8-10 cracks Qualified
Comparative example 3 3 10-12 cracks Qualified
Comparative example 4 4 10-12 cracks Qualified
Comparative example 5 5 Presence of cracks Fail to be qualified
Comparative example 6 3 7-10 cracks Qualified
From the test results in table 1, it can be seen that:
1. examples 1 to 3 change the addition amount of each component in the finishing varnish formula within a proper range, and it can be known from various detection data in table 1 that the coating prepared by the finishing varnish through UV curing has good adhesion performance and curing performance;
2. examples 4 to 6 all added nano titanium dioxide dispersion liquid into the finishing varnish system, and the difference was that the addition amount of the nano titanium dioxide dispersion liquid was different, but after the nano titanium dioxide dispersion liquid was added in an appropriate amount to the finishing varnish formula, the adhesion property and the curing property were both greatly improved, which indicates that the nano titanium dioxide dispersion liquid has the effect of improving the adhesion property of the finishing varnish coating;
3. comparing the detection data of the embodiment 1 with the detection data of the comparative examples 1 to 5, it can be seen that the polybutylene terephthalate acrylic resin and the polyurethane acrylic resin have good compatibility, and the polybutylene terephthalate acrylic resin and the polyurethane acrylic resin are cooperated to form a compact three-dimensional network molecular structure by the crosslinking reaction of the two monomers of the trimethylolpropane triacrylate and the dipentaerythritol hexaacrylate, so that the adhesion of the finishing varnish is remarkably promoted. If the adhesive performance of the finishing varnish is obviously reduced, the adhesive performance of the finishing varnish is obviously reduced;
4. comparing the detection data of the example 1 with the detection data of the comparative example 6 shows that the difference between the two results is that the rotation speed is increased and then decreased when the raw materials are stirred in the example 1, while the rotation speed is uniform in the comparative example 6, and the detection data shows that the stirring mode of the example 1 is more favorable for the dispersion of the raw materials, so that the adhesion performance of the finishing varnish can be improved to a certain extent.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (7)

1. An overprint varnish comprising the following components: 9-13 kg of polyurethane acrylic resin, 15-20 kg of polyester acrylic resin, 15-20 kg of trimethylolpropane triacrylate, 7.5-10.5 kg of dipentaerythritol hexaacrylate, 37-47 kg of solvent, 1-4 kg of photoinitiator, 0.3-0.7 kg of flatting agent and 3-5 kg of nano titanium dioxide dispersion liquid;
the preparation method of the nano titanium dioxide dispersion liquid comprises the following steps: 1) preparing an alcohol-water solution: weighing ethanol and pure water according to the mass ratio of 19:1, and preparing an alcohol-water solution; 2) weighing 20 parts of nano titanium dioxide, 0.08 part of KH-5703 part of triphosphite and 0.07 part of glacial acetic acid according to the parts by weight; 3) dispersing the nano titanium dioxide in an alcohol-water solution at 60 ℃, completely immersing the nano titanium dioxide in the alcohol-water solution, adding KH-570 into the alcohol-water solution, and reacting at constant temperature for 6 hours; 4) adding triphosphite into the dispersion liquid obtained in the step 3), and then placing the mixture into a magnetic stirrer to stir for 8-10 min to uniformly disperse the dispersion liquid; 5) and adding glacial acetic acid into the magnetic stirrer, and adjusting the pH value of the dispersion to 4.0-5.0 to prepare the nano titanium dioxide dispersion.
2. An overprint varnish according to claim 1, characterized in that: comprises the following components: 11kg of polyurethane acrylic resin, 17kg of polyester acrylic resin, 18kg of trimethylolpropane triacrylate, 9kg of dipentaerythritol hexaacrylate, 42kg of solvent, 2.5kg of photoinitiator, 0.5kg of flatting agent and 4kg of nano titanium dioxide dispersion.
3. An overprint varnish according to claim 1, characterized in that: the solvent comprises 9-11 kg of toluene, 9-11 kg of acetone, 9-11 kg of butyl acetate, 7-9 kg of ethyl acetate and 3-5 kg of diacetone alcohol.
4. An overprint varnish according to claim 1, characterized in that: the solvent comprises 10kg of toluene, 10kg of butyl acetate, 10kg of ethyl acetate, 8kg of acetone and 4kg of diacetone alcohol.
5. An overprint varnish according to claim 1, characterized in that: the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.
6. An overprint varnish according to claim 1, characterized in that: the leveling agent is polyether modified polydimethylsiloxane copolymer.
7. A process for preparing an overprint varnish according to any one of claims 1 to 6, comprising the steps of:
1) feeding: weighing polyurethane acrylic resin, polyester acrylic resin, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, a solvent, a photoinitiator and a leveling agent according to weight, and putting the raw materials into a reaction kettle;
2) dispersing: increasing the stirring speed in the reaction kettle from 300rpm to 1000rpm at the speed of 100rpm/min, then stirring at a constant speed for 5min, then reducing the stirring speed from 1000rpm to 400rpm at the speed of 150rpm/min, and then stirring at a constant speed for 3-5 min to uniformly disperse the raw materials to obtain a primary finished product of the finishing varnish;
3) paint mixing: adjusting the viscosity of the primary finished product according to the viscosity specified by the work order technical index, and controlling the viscosity of the primary finished product within +/-5% of the specified viscosity to prepare a sample to be detected of the finishing varnish;
4) and (4) checking: inspecting the performance of the sample to be inspected of the finishing varnish according to the specification of a product standard, packaging qualified products, and readjusting unqualified products;
5) packaging and warehousing: and after the packaging is finished, the product is inspected again according to the packaging specification and the specification, the qualified product is warehoused and stored, and the unqualified product is packaged again.
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