阅读说明：本技术 一种罩光清漆及其制备方法 (Finishing varnish and preparation method thereof ) 是由 万想 于 2020-07-28 设计创作，主要内容包括：本申请涉及一种罩光清漆及其制备方法,涉及涂料技术领域,罩光清漆包括以下组分：聚氨酯丙烯酸树脂9～13kg、聚酯丙烯酸树脂15～20kg、三羟甲基丙烷三丙烯酸酯15～20kg、二季戊四醇六丙烯酸酯7.5～10.5kg、溶剂37～47kg、光引发剂1～4kg以及流平剂0.3～0.7kg；制备方法包括以下步骤：1)投料；2)分散；3)调漆；4)检验；5)包装入仓。本申请具有改善罩光清漆涂层附着力差的效果。(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.)

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 and 0.3-0.7 kg of flatting agent.

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 and 0.5kg of leveling agent.

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 finishing varnish further comprises 3-5 kg of nano titanium dioxide dispersion liquid.

6. An overprint varnish according to claim 5, wherein: 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.

7. An overprint varnish according to claim 1, characterized in that: the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.

8. An overprint varnish according to claim 1, characterized in that: the leveling agent is polyether modified polydimethylsiloxane copolymer.

9. A process for preparing an overprint varnish according to any one of claims 1 to 8, 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.

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.