CN112029370A - Water-based varnish wear-resistant coating for digital printing and preparation method thereof - Google Patents
Water-based varnish wear-resistant coating for digital printing and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a water-based varnish wear-resistant coating for digital printing and a preparation method thereof, wherein the wear-resistant coating comprises the following raw materials: 30-50 parts of modified latex, 3-5 parts of film-forming additive, 2-6 parts of flatting agent and 3-7 parts of defoaming agent by weight, wherein the modified latex comprises the following raw materials: 10-20 parts of modified composite material, 8-12 parts of aminated cellulose, 50-60 parts of methyl methacrylate, 20-25 parts of butyl acrylate, 2-5 parts of acrylic acid, 4-7 parts of hydroxyethyl acrylate, 0.5-1 part of initiator and 1-2 parts of emulsifier. The modified latex is mainly prepared from components such as a modified composite material, aminated cellulose, methyl methacrylate, butyl acrylate and the like, wherein acrylate components such as methyl methacrylate, butyl acrylate and the like are used as a matrix, and the modified composite material and the aminated cellulose are added into the matrix, so that the wear resistance of the modified latex is improved while the performances such as gloss, adhesion and the like of the varnish are maintained.
Description
Technical Field
The invention relates to the technical field of varnish, in particular to a water-based varnish wear-resistant coating for digital printing and a preparation method thereof.
Background
The glazing oil is a liquid which is coated on the surface of a printed matter and has the functions of increasing glossiness, wear resistance and waterproofness. The glazing oil comprises water glazing oil, oily glazing oil, UV glazing oil, alcohol-soluble glazing oil and the like. At present, the most domestic application is the water-based varnish, and the water-based varnish has very good environmental protection performance.
At present, the coating and glazing technology is adopted by more and more printing manufacturers, so the demand of the glazing oil is continuously increased, and under the condition, the requirements of technicians in the field on the wear resistance, the glossiness and the like of the glazing oil are higher and higher, at present, silicon dioxide is generally added into the glazing oil prepared on the market as a wear-resistant material to improve the wear resistance of the glazing oil, but the wear resistance of the prepared glazing oil still cannot meet the requirements of people.
In order to solve the problem, we disclose a water-based varnish wear-resistant coating for digital printing and a preparation method thereof.
Disclosure of Invention
The invention aims to provide a water-based varnish wear-resistant coating for digital printing and a preparation method thereof, and aims to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
the water-based varnish wear-resistant coating for digital printing comprises the following raw materials: 30-50 parts of modified latex, 3-5 parts of film-forming additive, 2-6 parts of flatting agent and 3-7 parts of defoaming agent.
According to a more optimized scheme, the modified latex comprises the following raw materials in parts by weight: 10-20 parts of modified composite material, 8-12 parts of aminated cellulose, 50-60 parts of methyl methacrylate, 20-25 parts of butyl acrylate, 2-5 parts of acrylic acid, 4-7 parts of hydroxyethyl acrylate, 0.5-1 part of initiator and 1-2 parts of emulsifier.
According to an optimized scheme, the modified composite material is a silicon dioxide-silicon carbide composite material subjected to gamma-methacryloxypropyltrimethoxysilane modification treatment; the silicon dioxide-silicon carbide composite material is mainly prepared from silicon dioxide, carbon powder and absolute ethyl alcohol.
According to an optimized scheme, the aminated cellulose is mainly prepared from nano-cellulose, sodium hydroxide and epichlorohydrin.
In an optimized scheme, the initiator is dibenzoyl peroxide, and the emulsifier is sodium dodecyl sulfate.
In an optimized scheme, the defoaming agent is an organic silicon defoaming agent; the leveling agent is a BYK333 leveling agent.
According to an optimized scheme, the preparation method of the water-based varnish wear-resistant coating for digital printing comprises the following steps:
1) taking nano-cellulose and deionized water, performing ultrasonic dispersion, adding sodium hydroxide and epoxy chloropropane, stirring and reacting for 3-4h at 60-65 ℃, centrifuging, taking precipitated pure water, dialyzing until the pH is 11-12, taking the dialyzed suspension, adding ammonia water, continuing stirring and reacting at 60-65 ℃, continuing taking the reaction product pure water, dialyzing to neutrality, and drying to obtain aminated cellulose;
2) dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion, drying, placing in an argon environment, heating to 1450 and 1500 ℃, performing heat preservation treatment for 2-3h, and cooling along with a furnace to obtain a silicon dioxide-silicon carbide composite material;
3) drying a silicon dioxide-silicon carbide composite material, placing the dried silicon dioxide-silicon carbide composite material in deionized water, performing ultrasonic dispersion, adding gamma-methacryloxypropyltrimethoxysilane, heating to 75-80 ℃, performing condensation reflux for 20-24 hours, performing vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
4) dissolving an emulsifier and deionized water, stirring, adding a modified composite material and aminated cellulose, performing ultrasonic dispersion, slowly dropwise adding 1/2 parts of methyl methacrylate, 1/2 parts of butyl acrylate and an initiator, placing in an oil bath at 80-85 ℃, and reacting for 5-6 hours in a nitrogen environment to obtain a material A;
5) taking 1/2 mass of methyl methacrylate, 1/2 mass of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting at 70-80 ℃, adding the material A, reacting at a constant temperature, cooling after reaction, filtering, adjusting the pH value to 8-9 by ammonia water, adding ethanol, film-forming assistant, flatting agent and defoaming agent after stirring, and continuously stirring to obtain the finished product.
The optimized scheme comprises the following steps:
1) taking nano-cellulose and deionized water, carrying out ultrasonic dispersion for 5-10min, adding sodium hydroxide and epoxy chloropropane, stirring and reacting for 3-4h at 60-65 ℃, stirring at the rotating speed of 1000-2000r/min, centrifuging, taking precipitated pure water, dialyzing until the pH value is 11-12, taking the dialyzed suspension, adding ammonia water, continuing stirring and reacting for 3-4h at 60-65 ℃, continuing taking the reaction product of pure water, dialyzing to neutrality, and drying to obtain the aminated cellulose;
2) dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion for 3-4h, drying, placing in an argon environment, heating to 1450-;
3) taking a silicon dioxide-silicon carbide composite material, baking the silicon dioxide-silicon carbide composite material in a baking oven at the temperature of 90-100 ℃ for 10-12h, placing the baked silicon dioxide-silicon carbide composite material in deionized water, carrying out ultrasonic dispersion for 10-20min, adding gamma-methacryloxypropyltrimethoxysilane, heating to 75-80 ℃, carrying out condensation reflux for 20-24h, carrying out vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
4) dissolving an emulsifier and deionized water, stirring for 10-15min, adding a modified composite material and aminated cellulose, ultrasonically dispersing for 5-15min, slowly dropwise adding 1/2 wt of methyl methacrylate, 1/2 wt of butyl acrylate and an initiator dibenzoyl peroxide, placing in an oil bath at 80-85 ℃, and reacting for 5-6h in a nitrogen environment to obtain a material A;
5) taking 1/2 weight of methyl methacrylate, 1/2 weight of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting at 70-80 ℃ for 20-30min, adding the material A, reacting for 1-1.5h under heat preservation, cooling after reaction, filtering, adjusting the pH value to 8-9 with ammonia water, stirring for 10-20min, adding ethanol, film-forming assistant, flatting agent and defoaming agent, and stirring for 20-30min to obtain the finished product.
Compared with the prior art, the invention has the following beneficial effects:
the application discloses a water-based varnish wear-resistant coating for digital printing and a preparation method thereof, wherein the coating comprises modified latex, a film-forming assistant, a flatting agent and a defoaming agent, the modified latex is mainly prepared from components such as a modified composite material, aminated cellulose, methyl methacrylate, butyl acrylate and the like, wherein the acrylate components such as methyl methacrylate, butyl acrylate and the like are used as a matrix, the modified composite material and the aminated cellulose are added, and the performances such as gloss, adhesion and the like of varnish are maintained so as to improve the wear resistance of the varnish.
When the modified composite material is prepared, firstly, silicon dioxide, carbon powder and inorganic ethanol are adopted to prepare the silicon dioxide-silicon carbide composite material, in the conventional processing technology, only the silicon dioxide is generally added as a wear-resistant material to improve the wear resistance of the varnish, but in the actual processing, the adhesive force between the silicon dioxide and a matrix component is low, the silicon dioxide is easy to fall off when in use, but the wear resistance of the product is influenced, aiming at the problem, the traditional silicon dioxide is modified, the carbon powder is used as a carbon source, the silicon dioxide is subjected to carbon thermal reduction under the inert atmosphere condition, the silicon carbide-silicon dioxide composite material with a bead-shaped structure is prepared, the silicon carbide is a material with high hardness, high strength, corrosion resistance and good thermal stability, the grown silicon carbide is introduced into the silicon dioxide, and the mechanical property of the modified composite material can be further improved, thereby further improving the wear resistance of the product; meanwhile, the silicon carbide-silicon dioxide composite material prepared in the application is of a bead structure, silicon dioxide beads are connected in series through silicon carbide, and subsequent modification treatment is combined, so that the binding force and the adhesive force of the silicon carbide-silicon dioxide composite material and matrix components can be effectively improved, and the wear resistance of the glazing oil is effectively improved.
After the silicon carbide-silicon dioxide composite material is prepared, firstly, gamma-methacryloxypropyltrimethoxysilane is adopted for modification treatment to prepare a modified composite material, and when gloss oil is subsequently processed, the modified composite material, methyl methacrylate, 1/2 amount of butyl acrylate and an initiator are firstly used as raw materials for pretreatment, the silicon carbide-silicon dioxide composite material modified by methacryloxypropyltrimethoxysilane is used as a core, a hard monomer methyl methacrylate is used as a shell monomer, a material with the surface coated with methyl methacrylate is prepared by adopting a miniemulsion polymerization method, a soft monomer butyl acrylate is introduced in the processing process, a cross-linking network can be formed in a system, the silicon carbide-silicon dioxide composite material can be fixed and bonded, the treatment step not only can further improve the bonding force between the silicon carbide-silicon dioxide composite material and a matrix component, meanwhile, the silicon carbide-silicon dioxide composite material can be physically protected on the surface layer, and the wear resistance of the product is further improved.
This application still added amination cellulose at this in-process, nanofiber adds to the component as reinforcing material, carry out amination to it earlier and modify, acrylate monomer can carry out polycondensation with amino-modified cellulose afterwards, through the polymerization of active functional group on the acrylate monomer and amino, be connected amination cellulose to acrylate monomer main chain on, amination cellulose can improve the wear resistance of product equally, there are interaction such as hydrogen bond bonding between it and the modified composite, can be synergistic reaction each other, effectively improve finished product's wear resistance when improving bonding performance between the component.
Finally, the material obtained after pretreatment reacts with the rest materials (methyl methacrylate in 1/2 amount, butyl acrylate in 1/2 amount, acrylic acid, hydroxyethyl acrylate and dibenzoyl peroxide initiator) to grow modified latex, and conventional processing aids such as a film-forming aid, a leveling agent and the like are added to prepare the finished glazing oil product with excellent wear resistance.
The application discloses a water-based glazing oil wear-resistant coating for digital printing and a preparation method thereof, the process design is reasonable, the preparation steps are simple, the component proportion is proper, the wear-resistant glazing oil prepared by the method can greatly improve the wear resistance while maintaining the performances such as glossiness and adhesive force, and the practicability is higher.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a preparation method of a water-based varnish wear-resistant coating for digital printing comprises the following steps:
the method comprises the following steps: taking nano-cellulose and deionized water, carrying out ultrasonic dispersion for 5min, adding sodium hydroxide and epoxy chloropropane, stirring at 60 ℃ for reaction for 3h, stirring at the rotating speed of 1000r/min, centrifuging, taking precipitated pure water, dialyzing to pH 11, taking the dialyzed suspension, adding ammonia water, continuing stirring at 60 ℃ for reaction for 3h, continuing taking the reaction product, namely pure water, dialyzing to neutrality, and drying to obtain aminated cellulose;
step two: dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion for 3 hours, drying, placing in an argon environment, heating to 1450 ℃ at a heating rate of 5 ℃/min, performing heat preservation treatment for 2 hours, and cooling along with a furnace to obtain a silicon dioxide-silicon carbide composite material;
step three: taking a silicon dioxide-silicon carbide composite material, baking the silicon dioxide-silicon carbide composite material in a baking oven at 90 ℃ for 10 hours, placing the baked silicon dioxide-silicon carbide composite material in deionized water, performing ultrasonic dispersion for 10min, adding gamma-methacryloxypropyltrimethoxysilane, heating to 75 ℃, performing condensation reflux for 20 hours, performing vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
step four: dissolving an emulsifier and deionized water, stirring for 10min, adding the modified composite material and the aminated cellulose, ultrasonically dispersing for 5min, slowly dropwise adding 1/2 parts of methyl methacrylate, 1/2 parts of butyl acrylate and initiator dibenzoyl peroxide, placing in an oil bath at 80 ℃, and reacting for 5h in a nitrogen environment to obtain a material A;
step five: taking 1/2 mass of methyl methacrylate, 1/2 mass of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting for 20min at 70 ℃, adding the material A, reacting for 1h under heat preservation, cooling after reaction, filtering, adjusting the pH value to 8 by ammonia water, stirring for 10min, adding ethanol, film-forming assistant, flatting agent and defoaming agent, and stirring for 20min to obtain the finished product.
In this embodiment, the wear-resistant coating comprises the following raw materials: 30 parts of modified latex, 3 parts of film-forming additive, 2 parts of flatting agent and 3 parts of defoaming agent. Wherein the raw materials of each component of the modified latex comprise: by weight, 10 parts of modified composite material, 8 parts of aminated cellulose, 50 parts of methyl methacrylate, 20 parts of butyl acrylate, 2 parts of acrylic acid, 4 parts of hydroxyethyl acrylate, 0.5 part of initiator and 1 part of emulsifier.
The initiator is dibenzoyl peroxide, and the emulsifier is sodium dodecyl sulfate; the defoaming agent is an organic silicon defoaming agent; the leveling agent is a BYK333 leveling agent.
Example 2:
a preparation method of a water-based varnish wear-resistant coating for digital printing comprises the following steps:
the method comprises the following steps: taking nano-cellulose and deionized water, carrying out ultrasonic dispersion for 8min, adding sodium hydroxide and epoxy chloropropane, carrying out stirring reaction for 3.5h at 62 ℃, carrying out stirring rotation speed of 1500r/min, centrifuging, taking precipitated pure water, dialyzing to pH 11, taking the dialyzed suspension, adding ammonia water, continuing stirring reaction for 3.5h at 63 ℃, continuing taking the reaction product pure water, dialyzing to neutrality, and drying to obtain the aminated cellulose;
step two: dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion for 3.5h, drying, placing in an argon environment, heating to 1480 ℃ at the heating rate of 6 ℃/min, performing heat preservation treatment for 2.5h, and cooling along with a furnace to obtain a silicon dioxide-silicon carbide composite material;
step three: taking a silicon dioxide-silicon carbide composite material, baking the silicon dioxide-silicon carbide composite material in a baking oven at 95 ℃ for 11h, placing the baked silicon dioxide-silicon carbide composite material in deionized water, performing ultrasonic dispersion for 15min, adding gamma-methacryloxypropyltrimethoxysilane, heating to 78 ℃, performing condensation reflux for 22h, performing vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
step four: dissolving an emulsifier and deionized water, stirring for 13min, adding the modified composite material and the aminated cellulose, ultrasonically dispersing for 10min, slowly dropwise adding 1/2 parts of methyl methacrylate, 1/2 parts of butyl acrylate and initiator dibenzoyl peroxide, placing in an oil bath at 82 ℃, and reacting for 5.5h in a nitrogen environment to obtain a material A;
step five: taking 1/2 mass of methyl methacrylate, 1/2 mass of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting for 25min at 75 ℃, adding the material A, reacting for 1.2h under heat preservation, cooling after reaction, filtering, adjusting the pH value to 8 with ammonia water, stirring for 15min, adding ethanol, film-forming assistant, leveling agent and defoaming agent, and stirring for 25min to obtain the finished product.
In this embodiment, the wear-resistant coating comprises the following raw materials: 40 parts of modified latex, 4 parts of film-forming additive, 4 parts of flatting agent and 6 parts of defoaming agent. Wherein the raw materials of each component of the modified latex comprise: by weight, 15 parts of modified composite material, 10 parts of aminated cellulose, 55 parts of methyl methacrylate, 22 parts of butyl acrylate, 3 parts of acrylic acid, 5 parts of hydroxyethyl acrylate, 0.8 part of initiator and 1.5 parts of emulsifier.
The initiator is dibenzoyl peroxide, and the emulsifier is sodium dodecyl sulfate; the defoaming agent is an organic silicon defoaming agent; the leveling agent is a BYK333 leveling agent.
Example 3:
a preparation method of a water-based varnish wear-resistant coating for digital printing comprises the following steps:
the method comprises the following steps: taking nano-cellulose and deionized water, carrying out ultrasonic dispersion for 10min, adding sodium hydroxide and epoxy chloropropane, carrying out stirring reaction for 4h at 65 ℃, wherein the stirring rotation speed is 2000r/min, centrifuging, taking precipitated pure water, dialyzing to pH 12, taking the dialyzed suspension, adding ammonia water, continuing stirring reaction for 4h at 65 ℃, continuing taking the reaction product, namely pure water, dialyzing to neutrality, and drying to obtain aminated cellulose;
step two: dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion for 4 hours, drying, placing in an argon environment, heating to 1500 ℃ at the heating rate of 6 ℃/min, performing heat preservation treatment for 3 hours, and cooling along with a furnace to obtain a silicon dioxide-silicon carbide composite material;
step three: taking a silicon dioxide-silicon carbide composite material, placing the silicon dioxide-silicon carbide composite material in an oven at 100 ℃ for baking for 12h, placing the silicon dioxide-silicon carbide composite material in deionized water after baking, performing ultrasonic dispersion for 20min, adding gamma-methacryloxypropyltrimethoxysilane, heating to 80 ℃, performing condensation reflux for 24h, performing vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
step four: dissolving an emulsifier and deionized water, stirring for 15min, adding a modified composite material and aminated cellulose, ultrasonically dispersing for 15min, slowly dropwise adding 1/2 parts of methyl methacrylate, 1/2 parts of butyl acrylate and initiator dibenzoyl peroxide, placing in an oil bath at 85 ℃, and reacting for 6h in a nitrogen environment to obtain a material A;
step five: taking 1/2 mass of methyl methacrylate, 1/2 mass of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting for 30min at 80 ℃, adding the material A, reacting for 1.5h under heat preservation, cooling after reaction, filtering, adjusting the pH value to 9 with ammonia water, stirring for 20min, adding ethanol, film-forming assistant, leveling agent and defoaming agent, and stirring for 30min to obtain the finished product.
In this embodiment, the wear-resistant coating comprises the following raw materials: 50 parts of modified latex, 5 parts of film-forming assistant, 6 parts of flatting agent and 7 parts of defoaming agent. Wherein the raw materials of each component of the modified latex comprise: by weight, 20 parts of modified composite material, 12 parts of aminated cellulose, 60 parts of methyl methacrylate, 25 parts of butyl acrylate, 5 parts of acrylic acid, 7 parts of hydroxyethyl acrylate, 1 part of initiator and 2 parts of emulsifier.
The initiator is dibenzoyl peroxide, and the emulsifier is sodium dodecyl sulfate; the defoaming agent is an organic silicon defoaming agent; the leveling agent is a BYK333 leveling agent.
Examples 1 to 3 are the varnish wear-resistant coatings prepared according to the technical scheme disclosed by the invention, and the performance of the varnish wear-resistant coatings is respectively detected, and the detection data are shown in the following table:
(1) gloss: measured by a KGZ-IB type radial 60-degree angle gloss meter according to the national standard GB/T9754-1988.
(2) Adhesion force: the adhesive force of the water-based varnish wear-resistant paint is measured according to the marking method of the national standard GB/T9286-1988.
(3) Wear resistance: according to the national standard GB/T1786-2006, a QMH type abrasion resistance instrument is adopted, the test condition is 4 pounds of pressure, and the abrasion resistance is represented by the number of times of back and forth without surface layer abrasion.
(4) Water resistance: according to the test of the abrasion resistance test method of a paint film of the national standard GB/T1733-93, the glazing oil abrasion-resistant paint is coated on an aluminum plate meeting the specification of GB 1727, and the water resistance is measured under the drying condition according to the constant temperature and humidity condition and the time specified by GB 1727.
| Item | Gloss (%) | Adhesion force | Wear resistance/time | Water resistance |
| Example 1 | 96% | Level 0 | 732 | No foaming and dropping off |
| Example 2 | 98% | Level 0 | 746 | No foaming and dropping off |
| Example 3 | 99% | Level 0 | 757 | No foaming and dropping off |
| Comparative example 1 | 94% | Level 0 | 601 | / |
| Comparative example 2 | 93% | Level 0 | 649 | / |
| Comparative example 3 | 94% | Level 1 | 574 | / |
Comparative example 1:
a preparation method of a water-based varnish wear-resistant coating for digital printing comprises the following steps:
the method comprises the following steps: taking nano-cellulose and deionized water, carrying out ultrasonic dispersion for 8min, adding sodium hydroxide and epoxy chloropropane, carrying out stirring reaction for 3.5h at 62 ℃, carrying out stirring rotation speed of 1500r/min, centrifuging, taking precipitated pure water, dialyzing to pH 11, taking the dialyzed suspension, adding ammonia water, continuing stirring reaction for 3.5h at 63 ℃, continuing taking the reaction product pure water, dialyzing to neutrality, and drying to obtain the aminated cellulose;
step two: taking silicon dioxide microspheres, placing the silicon dioxide microspheres in an oven at 95 ℃ for baking for 11h, placing the silicon dioxide microspheres in deionized water after baking, performing ultrasonic dispersion for 15min, adding gamma-methacryloxypropyltrimethoxysilane, heating to 78 ℃, performing condensation reflux for 22h, performing vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
step three: dissolving an emulsifier and deionized water, stirring for 13min, adding the modified composite material and the aminated cellulose, ultrasonically dispersing for 10min, slowly dropwise adding 1/2 parts of methyl methacrylate, 1/2 parts of butyl acrylate and initiator dibenzoyl peroxide, placing in an oil bath at 82 ℃, and reacting for 5.5h in a nitrogen environment to obtain a material A;
step four: taking 1/2 mass of methyl methacrylate, 1/2 mass of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting for 25min at 75 ℃, adding the material A, reacting for 1.2h under heat preservation, cooling after reaction, filtering, adjusting the pH value to 8 with ammonia water, stirring for 15min, adding ethanol, film-forming assistant, leveling agent and defoaming agent, and stirring for 25min to obtain the finished product.
In this embodiment, the wear-resistant coating comprises the following raw materials: 40 parts of modified latex, 4 parts of film-forming additive, 4 parts of flatting agent and 6 parts of defoaming agent. Wherein the raw materials of each component of the modified latex comprise: by weight, 15 parts of modified composite material, 10 parts of aminated cellulose, 55 parts of methyl methacrylate, 22 parts of butyl acrylate, 3 parts of acrylic acid, 5 parts of hydroxyethyl acrylate, 0.8 part of initiator and 1.5 parts of emulsifier.
The initiator is dibenzoyl peroxide, and the emulsifier is sodium dodecyl sulfate; the defoaming agent is an organic silicon defoaming agent; the leveling agent is a BYK333 leveling agent.
And (4) conclusion: comparative example 1 is improved on the basis of example 2, in comparative example 1, only ordinary silica microspheres are added in the processing process, the other processing steps and the component content are consistent with those of example 2, and the abrasion resistance of the prepared finished product is greatly reduced compared with that of example 2.
Comparative example 2:
a preparation method of a water-based varnish wear-resistant coating for digital printing comprises the following steps:
the method comprises the following steps: dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion for 3.5h, drying, placing in an argon environment, heating to 1480 ℃ at the heating rate of 6 ℃/min, performing heat preservation treatment for 2.5h, and cooling along with a furnace to obtain a silicon dioxide-silicon carbide composite material;
step two: taking a silicon dioxide-silicon carbide composite material, baking the silicon dioxide-silicon carbide composite material in a baking oven at 95 ℃ for 11h, placing the baked silicon dioxide-silicon carbide composite material in deionized water, performing ultrasonic dispersion for 15min, adding gamma-methacryloxypropyltrimethoxysilane, heating to 78 ℃, performing condensation reflux for 22h, performing vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
step three: dissolving an emulsifier and deionized water, stirring for 13min, adding a modified composite material and nano-cellulose, performing ultrasonic dispersion for 10min, slowly dropwise adding 1/2 amount of methyl methacrylate, 1/2 amount of butyl acrylate and initiator dibenzoyl peroxide, placing in an oil bath at 82 ℃, and reacting for 5.5h in a nitrogen environment to obtain a material A;
step four: taking 1/2 mass of methyl methacrylate, 1/2 mass of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting for 25min at 75 ℃, adding the material A, reacting for 1.2h under heat preservation, cooling after reaction, filtering, adjusting the pH value to 8 with ammonia water, stirring for 15min, adding ethanol, film-forming assistant, leveling agent and defoaming agent, and stirring for 25min to obtain the finished product.
In this embodiment, the wear-resistant coating comprises the following raw materials: 40 parts of modified latex, 4 parts of film-forming additive, 4 parts of flatting agent and 6 parts of defoaming agent. Wherein the raw materials of each component of the modified latex comprise: by weight, 15 parts of modified composite material, 10 parts of nano-cellulose, 55 parts of methyl methacrylate, 22 parts of butyl acrylate, 3 parts of acrylic acid, 5 parts of hydroxyethyl acrylate, 0.8 part of initiator and 1.5 parts of emulsifier.
The initiator is dibenzoyl peroxide, and the emulsifier is sodium dodecyl sulfate; the defoaming agent is an organic silicon defoaming agent; the leveling agent is a BYK333 leveling agent.
And (4) conclusion: comparative example 2 is improved on the basis of example 2, only ordinary nanocellulose is added in the processing process of comparative example 2, and the rest processing steps and component content are consistent with those of example 2; as can be seen from the above table, the wear resistance of the finished product prepared is greatly reduced compared to example 2.
Comparative example 3:
a preparation method of a water-based varnish wear-resistant coating for digital printing comprises the following steps:
the method comprises the following steps: taking nano-cellulose and deionized water, carrying out ultrasonic dispersion for 8min, adding sodium hydroxide and epoxy chloropropane, carrying out stirring reaction for 3.5h at 62 ℃, carrying out stirring rotation speed of 1500r/min, centrifuging, taking precipitated pure water, dialyzing to pH 11, taking the dialyzed suspension, adding ammonia water, continuing stirring reaction for 3.5h at 63 ℃, continuing taking the reaction product pure water, dialyzing to neutrality, and drying to obtain the aminated cellulose;
step two: dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion for 3.5h, drying, placing in an argon environment, heating to 1480 ℃ at the heating rate of 6 ℃/min, performing heat preservation treatment for 2.5h, and cooling along with a furnace to obtain a silicon dioxide-silicon carbide composite material;
step three: taking a silicon dioxide-silicon carbide composite material, baking the silicon dioxide-silicon carbide composite material in a baking oven at 95 ℃ for 11h, placing the baked silicon dioxide-silicon carbide composite material in deionized water, performing ultrasonic dispersion for 15min, adding gamma-methacryloxypropyltrimethoxysilane, heating to 78 ℃, performing condensation reflux for 22h, performing vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
step four: taking methyl methacrylate, butyl acrylate, acrylic acid, hydroxyethyl acrylate, an initiator dibenzoyl peroxide, a modified composite material and aminated cellulose, reacting for 25min at 75 ℃, continuing to perform heat preservation reaction for 1.2h, cooling after the reaction, filtering, adjusting the pH value to 8 with ammonia water, stirring for 15min, adding ethanol, a film-forming assistant, a leveling agent and an antifoaming agent, and stirring for 25min to obtain a finished product.
In this embodiment, the wear-resistant coating comprises the following raw materials: 40 parts of modified latex, 4 parts of film-forming additive, 4 parts of flatting agent and 6 parts of defoaming agent. Wherein the raw materials of each component of the modified latex comprise: by weight, 15 parts of modified composite material, 10 parts of aminated cellulose, 55 parts of methyl methacrylate, 22 parts of butyl acrylate, 3 parts of acrylic acid, 5 parts of hydroxyethyl acrylate, 0.8 part of initiator and 1.5 parts of emulsifier.
The initiator is dibenzoyl peroxide, and the emulsifier is sodium dodecyl sulfate; the defoaming agent is an organic silicon defoaming agent; the leveling agent is a BYK333 leveling agent.
And (4) conclusion: comparative example 3 is improved on the basis of example 2, comparative example 3 is not pretreated in the processing process, and the rest processing steps and component content are consistent with those of example 2; as can be seen from the above table, the wear resistance and adhesion of the prepared finished product are greatly reduced compared with those of example 2.
In conclusion, compared with the common silicon dioxide microspheres, the beaded silicon carbide-silicon dioxide can effectively enhance the wear resistance of the product; the introduction of the aminated cellulose can further improve the wear resistance of the product; methyl methacrylate and butyl acrylate are firstly adopted to pretreat the modified composite material and the aminated cellulose in the processing process, so that the wear resistance of the product can be improved, the adhesive force of the product can be influenced, and the adhesive property of the product can be improved.
The application discloses a water-based glazing oil wear-resistant coating for digital printing and a preparation method thereof, the process design is reasonable, the preparation steps are simple, the component proportion is proper, the wear-resistant glazing oil prepared by the method can greatly improve the wear resistance while maintaining the performances such as glossiness and adhesive force, and the practicability is higher.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a wear-resisting coating of waterborne gloss oil for digital printing which characterized in that: the wear-resistant coating comprises the following raw materials: 30-50 parts of modified latex, 3-5 parts of film-forming additive, 2-6 parts of flatting agent and 3-7 parts of defoaming agent.
2. The waterborne varnish abrasion-resistant coating for digital printing as claimed in claim 1, wherein: the modified latex comprises the following raw materials in parts by weight: 10-20 parts of modified composite material, 8-12 parts of aminated cellulose, 50-60 parts of methyl methacrylate, 20-25 parts of butyl acrylate, 2-5 parts of acrylic acid, 4-7 parts of hydroxyethyl acrylate, 0.5-1 part of initiator and 1-2 parts of emulsifier.
3. The waterborne varnish abrasion-resistant coating for digital printing as claimed in claim 2, wherein: the modified composite material is a silicon dioxide-silicon carbide composite material subjected to gamma-methacryloxypropyltrimethoxysilane modification treatment; the silicon dioxide-silicon carbide composite material is mainly prepared from silicon dioxide, carbon powder and absolute ethyl alcohol.
4. The waterborne varnish abrasion-resistant coating for digital printing as claimed in claim 2, wherein: the aminated cellulose is mainly prepared from nano-cellulose, sodium hydroxide and epichlorohydrin.
5. The waterborne varnish abrasion-resistant coating for digital printing as claimed in claim 2, wherein: the initiator is dibenzoyl peroxide, and the emulsifier is sodium dodecyl sulfate.
6. The waterborne varnish abrasion-resistant coating for digital printing as claimed in claim 1, wherein: the defoaming agent is an organic silicon defoaming agent; the leveling agent is a BYK333 leveling agent.
7. A preparation method of a water-based varnish wear-resistant coating for digital printing is characterized by comprising the following steps: the method comprises the following steps:
1) taking nano-cellulose and deionized water, performing ultrasonic dispersion, adding sodium hydroxide and epoxy chloropropane, stirring and reacting for 3-4h at 60-65 ℃, centrifuging, taking precipitated pure water, dialyzing until the pH is 11-12, taking the dialyzed suspension, adding ammonia water, continuing stirring and reacting at 60-65 ℃, continuing taking the reaction product pure water, dialyzing to neutrality, and drying to obtain aminated cellulose;
2) dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion, drying, placing in an argon environment, heating to 1450 and 1500 ℃, performing heat preservation treatment for 2-3h, and cooling along with a furnace to obtain a silicon dioxide-silicon carbide composite material;
3) drying a silicon dioxide-silicon carbide composite material, placing the dried silicon dioxide-silicon carbide composite material in deionized water, performing ultrasonic dispersion, adding gamma-methacryloxypropyltrimethoxysilane, heating to 75-80 ℃, performing condensation reflux for 20-24 hours, performing vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
4) dissolving an emulsifier and deionized water, stirring, adding a modified composite material and aminated cellulose, performing ultrasonic dispersion, slowly dropwise adding 1/2 parts of methyl methacrylate, 1/2 parts of butyl acrylate and an initiator, placing in an oil bath at 80-85 ℃, and reacting for 5-6 hours in a nitrogen environment to obtain a material A;
5) taking 1/2 mass of methyl methacrylate, 1/2 mass of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting at 70-80 ℃, adding the material A, reacting at a constant temperature, cooling after reaction, filtering, adjusting the pH value to 8-9 by ammonia water, adding ethanol, film-forming assistant, flatting agent and defoaming agent after stirring, and continuously stirring to obtain the finished product.
8. The preparation method of the water-based varnish wear-resistant coating for digital printing as claimed in claim 7, wherein: the method comprises the following steps:
1) taking nano-cellulose and deionized water, carrying out ultrasonic dispersion for 5-10min, adding sodium hydroxide and epoxy chloropropane, stirring and reacting for 3-4h at 60-65 ℃, stirring at the rotating speed of 1000-2000r/min, centrifuging, taking precipitated pure water, dialyzing until the pH value is 11-12, taking the dialyzed suspension, adding ammonia water, continuing stirring and reacting for 3-4h at 60-65 ℃, continuing taking the reaction product of pure water, dialyzing to neutrality, and drying to obtain the aminated cellulose;
2) dissolving silicon dioxide and carbon powder in absolute ethyl alcohol, performing ultrasonic dispersion for 3-4h, drying, placing in an argon environment, heating to 1450-;
3) taking a silicon dioxide-silicon carbide composite material, baking the silicon dioxide-silicon carbide composite material in a baking oven at the temperature of 90-100 ℃ for 10-12h, placing the baked silicon dioxide-silicon carbide composite material in deionized water, carrying out ultrasonic dispersion for 10-20min, adding gamma-methacryloxypropyltrimethoxysilane, heating to 75-80 ℃, carrying out condensation reflux for 20-24h, carrying out vacuum drying, washing with ethanol, and drying to obtain a modified composite material;
4) dissolving an emulsifier and deionized water, stirring for 10-15min, adding a modified composite material and aminated cellulose, ultrasonically dispersing for 5-15min, slowly dropwise adding 1/2 wt of methyl methacrylate, 1/2 wt of butyl acrylate and an initiator dibenzoyl peroxide, placing in an oil bath at 80-85 ℃, and reacting for 5-6h in a nitrogen environment to obtain a material A;
5) taking 1/2 weight of methyl methacrylate, 1/2 weight of butyl acrylate, acrylic acid, hydroxyethyl acrylate and initiator dibenzoyl peroxide, reacting at 70-80 ℃ for 20-30min, adding the material A, reacting for 1-1.5h under heat preservation, cooling after reaction, filtering, adjusting the pH value to 8-9 with ammonia water, stirring for 10-20min, adding ethanol, film-forming assistant, flatting agent and defoaming agent, and stirring for 20-30min to obtain the finished product.
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