CN111171691A - Aqueous single-component woodenware coating and preparation method thereof - Google Patents
Aqueous single-component woodenware coating and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- 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
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- 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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention relates to a water-based single-component wood coating and a preparation method thereof, and the water-based single-component wood coating comprises, by weight, 30-40 parts of water-based acrylic resin, 35-40 parts of water-based polyurethane resin, 4-6 parts of organic montmorillonite, 10-15 parts of nano aluminum oxide slurry, 3-5 parts of nano silicon dioxide, 1-3 parts of nano titanium dioxide, 0.5-1 part of a wetting agent, 0.1-0.5 part of a defoaming agent, 6-8 parts of a film-forming auxiliary agent, 0.3-0.5 part of a flatting agent, 1-2 parts of a thickening agent, 0.2-0.3 part of a dispersing agent, 0.4-0.8 part of talcum powder, 0.1-0.3 part of vinyltriethoxysilane and 3-5 parts of matting powder. The woodware coating is suitable for high-grade woodware furniture by improving the hardness of the coating.
Description
Technical Field
The invention relates to the technical field of water-based paint, in particular to water-based single-component wood paint and a preparation method thereof.
Background
The woodware coating is mainly used for coating wood products such as wooden furniture, office appliances, musical instruments, teaching and sports equipment and the like and bamboo wares and rattan wares, has the decoration and beautification effects, and simultaneously has a good protection effect on the equipment. The woodenware furniture has different purposes and grades, and has different requirements on the performance of the woodenware paint. The traditional wood coatings are mainly solvent-based coatings, the solvent-based coatings become the first choice coatings for coating due to the excellent performance of the solvent-based coatings, but the solvent-based coatings release a large amount of volatile organic gases in the preparation and use processes, and cause harm to the environment and human bodies. With the improvement of environmental protection consciousness and the coming of related laws of people, the traditional solvent-based coating is gradually replaced by a novel environment-friendly coating, and the water-based coating is an important part of the novel environment-friendly coating.
The Chinese patent with application publication number CN107523157A discloses a water-based wood coating, which comprises the following components in parts by weight: 40-60 parts of acrylic resin emulsion, 20-30 parts of water-based alkyd resin emulsion, 3-6 parts of titanium-loaded silver bactericide, 1-2 parts of dispersing agent, 3-6 parts of flatting agent, 5-10 parts of thickening agent and 40-60 parts of deionized water, wherein the titanium-loaded silver bactericide is mainly prepared from silver nitrate, indium chloride and tin tetrachloride, and the coating has excellent antibacterial performance, environmental protection and no toxicity due to the addition of the titanium-loaded silver bactericide.
The above prior art solutions have the following drawbacks: the acrylic resin emulsion has large brittleness in a low-temperature environment due to a straight-chain structure, and the hardness is reduced at a high temperature, so that the wood coating is not suitable for high-grade wood furniture.
Disclosure of Invention
Aiming at the defects in the prior art, one of the purposes of the invention is to provide a water-based single-component wood coating, which is suitable for high-grade wood furniture by improving the hardness of a coating film; the invention also aims to provide a preparation method of the aqueous single-component woodenware coating, and the produced woodenware coating has stable performance and can uniformly disperse all components.
The above object of the present invention is achieved by the following technical solutions: the water-based single-component wood coating comprises, by weight, 30-40 parts of water-based acrylic resin, 35-40 parts of water-based polyurethane resin, 4-6 parts of organic montmorillonite, 10-15 parts of nano aluminum oxide slurry, 3-5 parts of nano silicon dioxide, 1-3 parts of nano titanium dioxide, 0.5-1 part of wetting agent, 0.1-0.5 part of defoaming agent, 6-8 parts of film-forming assistant, 0.3-0.5 part of flatting agent, 1-2 parts of thickening agent, 0.2-0.3 part of dispersing agent, 0.4-0.8 part of talcum powder, 0.1-0.3 part of vinyl triethoxysilane and 3-5 parts of matting powder, and the preparation method of the modified nano aluminum oxide comprises the following steps: 1) uniformly dispersing 10 parts of nano alumina in 50-70 parts of water according to parts by weight, adding 2-3 parts of a coupling agent, and stirring for 20-30 min; 2) and after stirring, adding 1-2 parts of dispersing agent and 0.5-1 part of anti-settling agent, and performing ultrasonic dispersion for 30-60 min to obtain the nano alumina slurry.
By adopting the technical scheme, the waterborne acrylic resin has quick drying, good transparency and good light and color retention, the unique hard and flexible performance of the waterborne polyurethane resin is determined by the chain segment structure consisting of the hard chain segment and the soft chain segment in the molecular structure of the waterborne polyurethane resin, the waterborne polyurethane resin has excellent low-temperature film-forming property, leveling property, flexibility and good hot-tack resistance due to the two-phase structure, the waterborne polyurethane resin has the properties of wear resistance and high hardness due to the existence of hydrogen bonds, the waterborne polyurethane resin and the waterborne acrylic resin are mutually complementary in performance, and the combination of the two is utilized to improve the comprehensive performance of the coating.
The ratio of surface atoms to bulk total atoms of the nano-alumina is sharply increased along with the reduction of the particle size, so that the nano-alumina shows strong volume effect, quantum size effect and surface effect, the binding force among particles is strong, the nano-alumina has high strength and high toughness, and the nano-alumina has the effect of improving the hardness of a film layer when added into a coating. However, the nano-alumina cannot be uniformly dispersed in the water-based paint and can be agglomerated, the surface of the nano-alumina is coated by using a coupling agent, a hydrophilic group of the coupling agent can be combined with a hydroxyl group on the surface of the nano-alumina, and a hydrophobic group is combined with a polymer in the water-based paint to prepare the nano-alumina slurry, so that the dispersibility and the stability of the nano-alumina in the water-based paint are improved. After the nano-alumina slurry is dispersed in the water-based paint, the specific surface area of the nano-alumina is large, molecular chains can be adsorbed on the surface of the nano-alumina slurry, and a plurality of molecular chains are mutually crosslinked to form crosslinking points, so that the deformation resistance of a coating film is improved, and the hardness of the coating film is improved. In addition, the nano-alumina has high surface energy and can be uniformly embedded in a three-dimensional network structure formed after the resin is cured, so that the bonding force in the resin is effectively enhanced, and a dried coating film can bear larger stress.
For a water-based paint system, for some woodware with low surface energy, the wetting property between the paint and the woodware is poor when the water-based paint is coated on the surface of the woodware, so that the adhesion of the paint is influenced, and the wetting agent is added, so that the surface tension of the paint can be reduced, and the paint is easy to coat on the woodware. The film forming assistant is also called as coalescing assistant, and can promote the plastic flow and elastic deformation of the polymer, improve the coalescing performance of the polymer and further promote the film forming of the coating.
The added dispersing agent can reduce the interfacial tension between liquid and solid and liquid and reduce the energy and time required for completing the dispersing process. The leveling agent can improve the fluidity of the coating and promote the coating to form a flat and smooth coating film in the drying film-forming process. The coating can produce a large amount of foams in the production process, the foams can influence the effective volume of equipment, the production efficiency of the coating is reduced, the foams can cause surface defects of a coating film after drying in the construction process, the coated surface after drying is uneven, and the defoaming agent is added to effectively inhibit foaming.
The water-based paint has the defects of low viscosity and poor rheological property due to the characteristics of the water-based paint, the rheological property of the water-based paint can be improved by adding the thickening agent, the pseudoplasticity of the paint is improved, the paint can be thinned when a high shear rate is used, and the paint can be thickened when the shear is stopped or the shear force is low, so that the storage stability of the paint can be improved, the sedimentation of inorganic components in the paint is avoided, the sagging of the paint can be prevented, and the good construction performance of the paint is ensured.
The vinyl triethoxysilane can increase the bonding capability between the polymer material and the inorganic material in the coating, and the anti-bubble capability of the coating can be improved after the adhesive force between the coating and the wood substrate is increased.
The present invention in a preferred example may be further configured to: the coupling agent at least comprises one of titanate coupling agent and KH 550.
By adopting the technical scheme, the alkoxy group in the titanate coupling agent is an active reaction group, and is provided with a polar group easy to hydrolyze and a stable organophilic long-chain group, the organophilic long-chain group is combined with the surface of the aluminum oxide, the surface of the aluminum oxide is nonpolar due to the organic long-chain group coated on the surface of the aluminum oxide, and the repulsive force with a polar dispersion medium water-based interface is enhanced, so that the settlement volume is reduced, and meanwhile, the titanate coupling agent can generate a steric hindrance effect to prevent the aggregation of nano aluminum oxide, so that the nano aluminum oxide can be uniformly dispersed in the coating. KH550 is a silane coupling agent, is added into water, is hydrolyzed firstly to generate silanol, and then generates firm bonding effect with the hydroxyl on the surface of the nano alumina particles, finally, the surface of the nano alumina molecules is covered by the silane coupling agent, and organic functional groups carried by the silane coupling agent can be combined with the organic matters in the coating, thereby improving the dispersion efficiency of the nano alumina.
The present invention in a preferred example may be further configured to: the wetting agent is 3-aminopropyltrimethoxysilane or 3-aminopropyltriethoxysilane.
By adopting the technical scheme, the 3-aminopropyltrimethoxysilane or the 3-aminopropyltriethoxysilane simultaneously contains hydrophobic and hydrophilic groups, so that the addition of a molecular structure can generate molecular orientation, the surface tension of the coating can be reduced, and the wettability and the permeability of the coating to woodware can be increased; in addition, the wetting agent can promote the compatibility of the defoaming agent and a system and improve the interlayer adhesion.
The present invention in a preferred example may be further configured to: the defoaming agent is polyether modified organic silicon defoaming agent.
By adopting the technical scheme, the polyether modified organic silicon defoaming agent takes a polyether structure with strong foam inhibition capability and dimethyl silicone oil with rapid foam breaking as main components, and after the defoaming agent is added into a coating system, molecules of the defoaming agent are distributed on the surface of the liquid in a disordered manner, so that an elastic film is inhibited from being formed, and the generation of foam is stopped. If a large amount of foam is generated in the system, the added defoaming agent is dispersed on the surface of the foam and is further diffused, permeated and invaded in a layered manner to replace the thin wall of the original foam membrane, and the foam flows to the liquid with high surface tension generating the foam due to low surface tension, so that the defoaming agent with low surface tension is continuously diffused and permeated among gas-liquid interfaces, the membrane wall of the foam is quickly thinned, and the foam is simultaneously subjected to the film traction force with large surface tension around the foam, so that the foam can be broken after the stress around the foam is unbalanced.
The present invention in a preferred example may be further configured to: the film-forming assistant at least comprises one of dipropylene glycol methyl ether, dipropylene glycol n-butyl ether and decaglycol ester.
By adopting the technical scheme, the molecules of the dipropylene glycol methyl ether and the dipropylene glycol n-butyl ether have two functional groups of alcohol and ether at the same time, so that unique polar and nonpolar dissolubility can be provided, the surface tension of a water-based system can be reduced, and the film forming of the coating is promoted. The lauryl ester is slowly evaporated, so that the film forming temperature can be reduced, and the scrubbing resistance of the coating film is improved.
The present invention in a preferred example may be further configured to: the leveling agent is BYK-333.
By adopting the technical scheme, BYK-333 belongs to polyether polyester modified organosiloxane substances, has good compatibility with water, can be uniformly dispersed under a water system condition, and promotes the coating to form a flat and smooth coating film in the drying film-forming process by reducing the surface tension of the coating and improving the fluidity of the coating.
The present invention in a preferred example may be further configured to: the thickener is hydroxyethyl cellulose.
By adopting the technical scheme, the hydrophobic main chain on the hydroxyethyl cellulose structure and water form hydrogen bonds, and other structural polar groups interact to build a three-dimensional net structure, so that the polymer rheological volume is improved, the free moving space of the polymer is limited, and the viscosity of the coating is improved. When the shearing force is applied, the three-dimensional network structure is broken, the hydrogen bonds among molecules disappear, the viscosity is reduced, when the shearing force is removed, the hydrogen bonds are reformed, and the three-dimensional network structure is reestablished, so that the coating is ensured to have good rheological property.
The second aim of the invention is realized by the following technical scheme: a preparation method of a water-based single-component woodenware coating specifically comprises the following steps:
step 1, weighing the water-based acrylic resin, the water-based polyurethane resin, the nano alumina slurry, the wetting agent and the dispersing agent according to the formula ratio, uniformly dispersing in a container, continuously stirring, and controlling the stirring speed at 1500-2000 r/min;
step 2, adding matting powder and continuously stirring, wherein the stirring speed is controlled to be 2500-3000 r/min;
and 3, dispersing the film-forming assistant and the thickening agent uniformly in advance, then sequentially adding organic bentonite, nano silicon dioxide, nano titanium dioxide, a defoaming agent, a flatting agent, talcum powder and vinyl triethoxysilane, stirring, and controlling the stirring speed at 3000-4000 r/min to obtain the water-based single-component wood coating.
By adopting the technical scheme, the produced woodware coating has stable performance, and all components can be uniformly dispersed and are easy to store.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the ratio of surface atoms to bulk total atoms of the nano-alumina is sharply increased along with the reduction of the particle size, so that the nano-alumina shows strong volume effect, quantum size effect and surface effect, the binding force among particles is strong, the nano-alumina has high strength and high toughness, and the nano-alumina has the effect of improving the hardness of a film layer when added into a coating. However, the nano-alumina cannot be uniformly dispersed in the water-based paint and can be agglomerated, the surface of the nano-alumina is coated by adopting a coupling agent, a hydrophilic group of the coupling agent can be combined with a hydroxyl group on the surface of the nano-alumina, and a hydrophobic group is combined with a polymer in the water-based paint to prepare nano-alumina slurry, so that the dispersibility and stability of the nano-alumina in the water-based paint are improved; after the nano-alumina slurry is dispersed in the water-based paint, the specific surface area of the nano-alumina is large, molecular chains can be adsorbed on the surface of the nano-alumina slurry, and a plurality of molecular chains are mutually crosslinked to form crosslinking points, so that the deformation resistance of a coating film is improved, and the hardness of the coating film is improved. In addition, the nano-alumina has high surface energy and can be uniformly embedded in a three-dimensional network structure formed after the resin is cured, so that the bonding force in the resin is effectively enhanced, and a dried coating film can bear larger stress;
2. the waterborne acrylic resin has quick drying, good transparency and good gloss and color retention, the unique hard and flexible performance of the waterborne polyurethane resin is determined by the chain segment structure consisting of the hard chain segment and the soft chain segment in the molecular structure of the waterborne polyurethane resin, the waterborne polyurethane resin has excellent low-temperature film forming property, leveling property, flexibility and hot-tack-resistant property due to the two-phase structure, and has the properties of wear resistance and high hardness due to the existence of hydrogen bonds, the waterborne polyurethane resin and the waterborne acrylic resin are mutually complementary in performance, and the combination of the waterborne polyurethane resin and the waterborne acrylic resin is utilized to improve the comprehensive performance of the coating;
3. for a water-based paint system, for some woodware with low surface energy, the wetting property between the paint and the woodware is poor when the water-based paint is coated on the surface of the woodware, so that the adhesion of the paint is influenced, and the wetting agent is added, so that the surface tension of the paint can be reduced, and the paint is easy to coat on the woodware.
Drawings
FIG. 1 is a schematic view of a preparation method of the aqueous single-component wood coating of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
Table 1 shows the raw materials and weight of the aqueous single-component wood coating of example 1
| Raw materials | Weight (kg) | Raw materials | Weight (kg) |
| Water-based acrylic resin | 30 | Dipropylene glycol methyl ether | 6 |
| Aqueous polyurethane resin | 40 | BYK-333 | 0.3 |
| Organic montmorillonite | 4 | Hydroxyethyl cellulose | 1 |
| Nano alumina slurry | 10 | Dispersant 731A | 0.3 |
| Nano silicon dioxide | 3 | Talcum powder | 0.6 |
| Nano titanium dioxide | 3 | Vinyl triethoxy silane | 0.1 |
| 3-aminopropyltrimethoxysilane | 0.5 | Extinction powder TS-100 | 3 |
| Polyether modified organic silicon defoaming agent | 0.1 |
The preparation method of the nano alumina slurry comprises the following steps: 1) uniformly dispersing 10kg of nano alumina in 50kg of water, adding 2kg of silane coupling agent KH550, and stirring for 20 min; 2) after stirring, 1kg of dispersing agent 3204 and 0.5kg of anti-settling agent BYK420 are added, and ultrasonic dispersion is carried out for 30min to obtain nano alumina slurry.
A preparation method of a water-based single-component woodenware coating specifically comprises the following steps:
step 1, weighing the water-based acrylic resin, the water-based polyurethane resin, the nano alumina slurry, the wetting agent and the dispersing agent according to the formula ratio, uniformly dispersing in a container, continuously stirring, and controlling the stirring speed at 1500 r/min;
step 2, adding matting powder and continuing stirring, wherein the stirring speed is controlled at 2500 r/min;
and 3, dispersing the film-forming assistant and the thickening agent uniformly in advance, then sequentially adding organic bentonite, nano silicon dioxide, nano titanium dioxide, a defoaming agent, a flatting agent, talcum powder and vinyl triethoxysilane, stirring, and controlling the stirring speed at 3000r/min to obtain the water-based single-component wood coating.
Example 2
Table 2 shows the raw materials and weight of the waterborne single-component wood coating of example 2
The preparation method of the nano alumina slurry comprises the following steps: 1) uniformly dispersing 10kg of nano alumina in 60kg of water, then adding 2kg of titanate coupling agent NDZ201, and stirring for 30 min; 2) after stirring, 2kg of dispersing agent 3204 and 1kg of anti-settling agent BYK420 are added, and ultrasonic dispersion is carried out for 40min to obtain the nano alumina slurry.
A preparation method of a water-based single-component woodenware coating specifically comprises the following steps:
step 1, weighing the water-based acrylic resin, the water-based polyurethane resin, the nano alumina slurry, the wetting agent and the dispersing agent according to the formula ratio, uniformly dispersing in a container, continuously stirring, and controlling the stirring speed at 2000 r/min;
step 2, adding matting powder and continuing stirring, wherein the stirring speed is controlled at 3000 r/min;
and 3, dispersing the film-forming assistant and the thickening agent uniformly in advance, then sequentially adding organic bentonite, nano silicon dioxide, nano titanium dioxide, a defoaming agent, a flatting agent, talcum powder and vinyl triethoxysilane, stirring, and controlling the stirring speed at 4000r/min to obtain the water-based single-component wood coating.
Example 3
Table 3 shows the raw materials and weight of the waterborne single-component wood coating of example 3
| Raw materials | Weight (kg) | Raw materials | Weight (kg) |
| Water-based acrylic resin | 40 | Dipropylene glycol n-butyl ether | 3 |
| Aqueous polyurethane resin | 37 | Decanol esters | 3 |
| Organic montmorillonite | 6 | BYK-333 | 0.5 |
| Nano alumina slurry | 14 | Hydroxyethyl cellulose | 2 |
| Nano silicon dioxide | 5 | Dispersant 731A | 0.2 |
| Nano titanium dioxide | 1 | Talcum powder | 0.8 |
| 3-aminopropyltrimethoxysilane | 1 | Vinyl triethoxy silane | 0.3 |
| Polyether modified organic silicon defoaming agent | 0.5 | Extinction powder TS-100 | 5 |
The preparation method of the nano alumina slurry comprises the following steps: 1) uniformly dispersing 10kg of nano alumina in 70kg of water, then adding 1.5kg of titanate coupling agent NDZ201 and 1.5kg of silane coupling agent KH550, and stirring for 30 min; 2) after stirring, 1.5kg of dispersing agent 3204 and 0.8kg of anti-settling agent BYK420 are added, and ultrasonic dispersion is carried out for 60min to obtain nano alumina slurry.
A preparation method of a water-based single-component woodenware coating specifically comprises the following steps:
step 1, weighing the water-based acrylic resin, the water-based polyurethane resin, the nano alumina slurry, the wetting agent and the dispersing agent according to the formula ratio, uniformly dispersing in a container, continuously stirring, and controlling the stirring speed at 2000 r/min;
step 2, adding matting powder and continuing stirring, wherein the stirring speed is controlled at 2500 r/min;
and 3, dispersing the film-forming assistant and the thickening agent uniformly in advance, then sequentially adding the organic bentonite, the nano silicon dioxide, the nano titanium dioxide, the defoaming agent, the flatting agent, the talcum powder and the vinyl triethoxysilane, stirring, and controlling the stirring speed at 3500r/min to obtain the aqueous single-component woodenware coating.
Example 4
Table 4 shows the raw materials and weight of the waterborne single-component wood coating of example 4
| Raw materials | Weight (kg) | Raw materials | Weight (kg) |
| Water-based acrylic resin | 32 | Dipropylene glycol n-butyl ether | 2 |
| Aqueous polyurethane resin | 36 | Decanol esters | 4 |
| Organic montmorillonite | 6 | BYK-333 | 0.5 |
| Nano alumina slurry | 13 | Hydroxyethyl cellulose | 2 |
| Nano silicon dioxide | 3 | Dispersant 731A | 0.3 |
| Nano titanium dioxide | 1 | Talcum powder | 0.7 |
| 3-aminopropyltriethoxysilane | 1 | Vinyl triethoxy silane | 0.2 |
| Polyether modified organic silicon defoaming agent | 0.2 | Extinction powder TS-100 | 3 |
| Dipropylene glycol methyl ether | 2 |
The preparation method of the nano alumina slurry is the same as that of the example 3.
A preparation method of the aqueous single-component woodenware coating, which is the same as the example 3.
Example 5
Table 5 shows the raw materials and weight of the waterborne single-component wood coating of example 5
The preparation method of the nano alumina slurry is the same as that of the example 3.
A preparation method of the aqueous single-component woodenware coating, which is the same as the example 3.
Example 6
Table 6 shows the raw materials and weight of the waterborne single-component wood coating of example 6
| Raw materials | Weight (kg) | Raw materials | Weight (kg) |
| Water-based acrylic resin | 36 | Dipropylene glycol n-butyl ether | 2 |
| Aqueous polyurethane resin | 38 | Decanol esters | 3 |
| Organic montmorillonite | 5 | BYK-333 | 0.4 |
| Nano alumina slurry | 13 | Hydroxyethyl cellulose | 1.6 |
| Nano silicon dioxide | 4 | Dispersant 731A | 0.3 |
| Nano titanium dioxide | 2 | Talcum powder | 0.6 |
| 3-aminopropyltriethoxysilane | 0.8 | Vinyl triethoxy silane | 0.2 |
| Polyether modified organic silicon defoaming agent | 0.3 | Extinction powder TS-100 | 4 |
| Dipropylene glycol methyl ether | 3 |
The preparation method of the nano alumina slurry is the same as that of the example 3.
A preparation method of the aqueous single-component woodenware coating, which is the same as the example 3.
Comparative example 1
An aqueous one-component wood paint coating, which is different from example 6 in that it does not include an aqueous polyurethane resin, is identical to example 6.
Comparative example 2
An aqueous one-component wood paint coating, which differs from example 6 in that it does not include a nano alumina slurry, is otherwise the same as example 6.
Comparative example 3
An aqueous one-component wood paint coating, which is different from example 6 in that the nano alumina slurry is changed to nano alumina, and the other is the same as example 6.
Comparative example 4
An aqueous one-component wood paint coating was distinguished from example 6 in that the nano alumina slurry had a mass of 8kg, and the rest was the same as example 6.
Comparative example 5
An aqueous one-component wood paint coating was distinguished from example 6 in that the nano alumina slurry had a mass of 17kg, and otherwise the same as example 6.
Performance detection
The aqueous single-component woodware coating prepared in the examples and the comparative examples is uniformly coated on the wood board by using a scraper, and the coating thickness is 0.2 mm.
Appearance of the coating film: the coating is uniform, has no sagging phenomenon and has no pinholes on the surface, so that the coating is normal, otherwise, the coating is defective;
gloss (60 °): the determination is carried out with reference to GB/T9754-2007 determination of 20 DEG, 60 DEG and 85 DEG specular gloss of paint films of metallic pigment-free colored paints;
hardness: testing is carried out according to GB/T1730-93B pendulum damping experiment of paint film hardness determination method;
adhesion force: the test is carried out with reference to GB/T9286-1988 "test for drawing checks on paint films".
Table 7 shows the results of the performance tests
| Appearance of coating film | Gloss (60 degree) | Hardness of | Adhesion (grade) | |
| Example 1 | Is normal | 78 | 0.64 | 0 |
| Example 2 | Is normal | 80 | 0.65 | 0 |
| Example 3 | Is normal | 81 | 0.67 | 0 |
| Example 4 | Is normal | 83 | 0.68 | 0 |
| Example 5 | Is normal | 84 | 0.70 | 0 |
| Example 6 | Is normal | 88 | 0.73 | 0 |
| Comparative example 1 | Is normal | 65 | 0.51 | 1 |
| Comparative example 2 | With pinholes on the surface | 68 | 0.35 | 1 |
| Comparative example 3 | With small particles on the surface | 60 | 0.39 | 1 |
| Comparative example 4 | Is normal | 71 | 0.48 | 1 |
| Comparative example 5 | Non-uniformity of coating film | 64 | 0.55 | 1 |
According to the performance test result, the woodware coating prepared in the embodiment 6 has the optimal performance, and the comparison between the embodiment 6 and the comparative example 1 and the comparative example 2 shows that the waterborne polyurethane resin and the nano alumina slurry can improve the hardness of a coating film; the nano alumina added in the comparative example 3 has no obvious improvement on the performance of the coating film, because the nano alumina cannot be uniformly dispersed in the coating, small particles are formed on the surface of the coating film, the coating film is not flat, and the appearance and the glossiness of the coating film are influenced. Example 6 compares with comparative example 4 and comparative example 5, the hardness of the coating film is increased and then decreased along with the increase of the addition amount of the nano alumina slurry, and the increase of the nano alumina can destroy the arrangement of hard segments of the macromolecular polymer, influence crystallization and cause the hardness of the coating film to be reduced.
The present embodiment is only for explaining the present invention, and not for limiting the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of which are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. A water-based single-component woodware coating is characterized in that: the modified nano-alumina paint comprises, by weight, 30-40 parts of water-based acrylic resin, 35-40 parts of water-based polyurethane resin, 4-6 parts of organic montmorillonite, 10-15 parts of nano-alumina slurry, 3-5 parts of nano-silica, 1-3 parts of nano-titanium dioxide, 0.5-1 part of wetting agent, 0.1-0.5 part of defoaming agent, 6-8 parts of film-forming assistant, 0.3-0.5 part of flatting agent, 1-2 parts of thickening agent, 0.2-0.3 part of dispersing agent, 0.4-0.8 part of talcum powder, 0.1-0.3 part of vinyl triethoxysilane and 3-5 parts of matting powder, and the preparation method of the modified nano-alumina paint comprises the following steps: 1) uniformly dispersing 10 parts of nano alumina in 50-70 parts of water according to parts by weight, adding 2-3 parts of a coupling agent, and stirring for 20-30 min; 2) and after stirring, adding 1-2 parts of dispersing agent and 0.5-1 part of anti-settling agent, and performing ultrasonic dispersion for 30-60 min to obtain the nano alumina slurry.
2. The aqueous single-component wood coating according to claim 1, wherein: the coupling agent at least comprises one of titanate coupling agent and KH 550.
3. The aqueous single-component wood coating according to claim 1, wherein: the wetting agent is 3-aminopropyltrimethoxysilane or 3-aminopropyltriethoxysilane.
4. The aqueous single-component wood coating according to claim 1, wherein: the defoaming agent is polyether modified organic silicon defoaming agent.
5. The aqueous single-component wood coating according to claim 1, wherein: the film-forming assistant at least comprises one of dipropylene glycol methyl ether, dipropylene glycol n-butyl ether and decaglycol ester.
6. The aqueous single-component wood coating according to claim 1, wherein: the leveling agent is BYK-333.
7. The aqueous single-component wood coating according to claim 1, wherein: the thickener is hydroxyethyl cellulose.
8. A preparation method of a water-based single-component woodware coating is characterized by comprising the following steps: the method specifically comprises the following steps:
step 1, weighing the water-based acrylic resin, the water-based polyurethane resin, the nano alumina slurry, the wetting agent and the dispersing agent according to the formula ratio, uniformly dispersing in a container, continuously stirring, and controlling the stirring speed at 1500-2000 r/min;
step 2, adding matting powder and continuously stirring, wherein the stirring speed is controlled to be 2500-3000 r/min;
and 3, dispersing the film-forming assistant and the thickening agent uniformly in advance, then sequentially adding organic bentonite, nano silicon dioxide, nano titanium dioxide, a defoaming agent, a flatting agent, talcum powder and vinyl triethoxysilane, stirring, and controlling the stirring speed at 3000-4000 r/min to obtain the water-based single-component wood coating.
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| CN114683654A (en) * | 2022-03-29 | 2022-07-01 | 苏州瑞高新材料有限公司 | Full-aqueous surface-treated automotive interior material and preparation method thereof |
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| CN115785747A (en) * | 2022-12-01 | 2023-03-14 | 江西龙正科技发展有限公司 | Novel water-based transparent woodware primer |
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