CN112409893A - High-solid-content low-VOC protective coating and preparation method and application thereof - Google Patents
High-solid-content low-VOC protective coating and preparation method and application thereof Download PDFInfo
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- CN112409893A CN112409893A CN202011286473.4A CN202011286473A CN112409893A CN 112409893 A CN112409893 A CN 112409893A CN 202011286473 A CN202011286473 A CN 202011286473A CN 112409893 A CN112409893 A CN 112409893A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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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
- C09D7/20—Diluents or solvents
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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Abstract
The invention provides a high-solid low-VOC protective coating and a preparation method and application thereof, belonging to the technical field of coatings. The invention provides a high-solid-content low-VOC protective coating which comprises the following components in parts by weight: 55-65 parts of high-solid low-viscosity alkyd resin; 8-15 parts of heavy calcium carbonate; 6-10 parts of an alcohol ether solvent; 0.3-0.5 part of organic bentonite; 0.2-0.4 part of wetting agent; 0.3-0.5 part of a dispersing agent; 0.7-1 part of a drier; 0.2-0.3 part of anti-skinning agent. The high-solid low-viscosity alkyd resin is used as a main body, an alcohol ether solvent, heavy calcium carbonate and organic bentonite are added, and the high-solid low-VOC protective coating obtained under the action of a wetting agent, a dispersing agent, a drier and an anti-skinning agent is more environment-friendly in the production, transportation and use processes; excellent acid resistance, alkali resistance, weather resistance and the like.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a high-solid low-VOC protective coating and a preparation method and application thereof.
Background
The solvent-based coating has high decoration, durable protection and multifunction, and is widely applied in the fields of modern industry, national defense, information, biochemistry, new materials, aerospace, ocean development, renewable energy development, environmental protection and the like. The organic solvent in the solvent-based paint plays a critical role, for example, the organic solvent can reduce the surface tension of the paint, improve the wetting and dispersing performance of the pigment, adjust the viscosity of a film forming material and the paint, improve the fluidity of the paint and the like, so that the paint product meets different paint making requirements and construction requirements.
However, most of the organic solvents adopted by the existing solvent-based paint are flammable and volatile, pollute the environment and are harmful to human bodies, especially the organic solvents volatilize in the atmosphere and cause primary pollution to the atmosphere, and the organic solvents generate photochemical reaction under the action of light and oxygen, accelerate the generation of ozone and highly toxic nitrogen oxides and cause serious secondary pollution to the atmosphere. Compared with the traditional coating, the existing high-solid low-VOC coating can relatively reduce VOC emission, has relatively high volume solid content, and can form a film thickness in one pass, but still cannot meet the requirement of industrial steel structure protection.
Disclosure of Invention
The invention aims to provide a high-solid low-VOC protective coating and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a high-solid-content low-VOC protective coating which comprises the following components in parts by weight:
55-65 parts of high-solid low-viscosity alkyd resin;
8-15 parts of heavy calcium carbonate;
6-10 parts of an alcohol ether solvent;
0.2-0.4 part of wetting agent;
0.3-0.5 part of organic bentonite;
0.3-0.5 part of a dispersing agent;
0.7-1 part of a drier;
0.2-0.3 part of anti-skinning agent.
Preferably, the high-solid low-viscosity alkyd resin is prepared by high-temperature reaction of natural vegetable oil; the high-temperature reaction is carried out at the temperature of 180-250 ℃ for 7-11 h.
Preferably, the high-solid low-VOC protective coating also comprises 15-20 parts of titanium dioxide; the titanium dioxide is rutile titanium dioxide, and the particle size is 10-100 nm.
Preferably, the particle size of the heavy calcium carbonate is 1100-1300 meshes.
Preferably, the alcohol ether solvent comprises one or more of diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, diethylene glycol ethyl ether and tripropylene glycol methyl ether.
Preferably, the wetting agent is silicone oil; the dispersant comprises a phosphate dispersant; the drier comprises one or more of metal oxide, metal salt and rare earth drier; the anti-skinning agent is methyl ethyl ketoxime.
Preferably, the metals in the metal oxide and metal salt independently comprise cobalt, manganese, iron, zinc or calcium; the rare earth elements in the rare earth drier comprise one or more of cerium, lanthanum and yttrium.
The invention provides a preparation method of a high-solid low-VOC protective coating, which comprises the following steps:
mixing and grinding part of the alcohol ether solvent, part of the high-solid low-viscosity alkyd resin and the rest of the components to obtain slurry; the residual components are all components except the drier, the anti-skinning agent, the alcohol ether solvent and the high-solid low-viscosity alkyd resin;
and mixing the slurry, the residual high-solid low-viscosity alkyd resin, the drier, the residual alcohol ether solvent and the anti-skinning agent to obtain the protective coating.
Preferably, the partial alcohol ether solvent accounts for 75-85% of the total mass of the alcohol ether solvent;
the part of the high-solid low-viscosity alkyd resin accounts for 65-75% of the total mass of the high-solid low-viscosity alkyd resin;
the fineness of the slurry is less than or equal to 40 mu m.
The invention provides an application of the high-solid low-VOC protective coating in steel structure protection.
The invention has the beneficial effects that:
the protective coating prepared by taking the alkyd resin with high solid content and low viscosity as a main body and adding the alcohol ether solvent, the heavy calcium carbonate and the organic bentonite has high solid content under the action of the wetting agent, the dispersing agent, the drier and the anti-skinning agent, and belongs to an environment-friendly protective coating; the paint has the advantages of good adhesive force, flexibility, alkali resistance, acid resistance, wear resistance and weather resistance, small toxicity, environmental protection, high hardness, smooth and delicate paint film, no toxicity and no pollution, and can effectively prolong the service life of the paint film of the high-solid low-VOC protective paint.
The invention provides a preparation method of the high-solid low-VOC protective coating, which is simple to operate and suitable for large-scale production.
Detailed Description
The invention provides a high-solid-content low-VOC protective coating which comprises the following components in parts by weight:
55-65 parts of high-solid low-viscosity alkyd resin;
8-15 parts of heavy calcium carbonate;
6-10 parts of an alcohol ether solvent;
0.2-0.4 part of wetting agent;
0.3-0.5% of a dispersant;
0.3-0.5 part of organic bentonite;
0.7-1 part of a drier;
0.2-0.3 part of anti-skinning agent.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
According to the invention, the raw materials for preparing the high-solid low-VOC protective coating comprise 55-65 parts by weight of high-solid low-viscosity alkyd resin, preferably 60-65 parts by weight of high-solid low-VOC protective coating. In the invention, the dosage of the high-solid low-viscosity alkyd resin is too much, so that the alkyd resin protective coating is not easy to dry; the dosage is too small, and the fullness of the paint film of the steel structure protective paint is poor. In the invention, the high-solid low-viscosity alkyd resin is preferably prepared from natural vegetable oil through a high-temperature reaction. In the invention, in the high-temperature reaction process, the natural vegetable oil is subjected to alcoholysis and then polymerization. In the present invention, the natural vegetable oil preferably includes one or more of soybean oil, linseed oil and cottonseed oil, and more preferably soybean oil, linseed oil or cottonseed oil. In the invention, the temperature of the high-temperature reaction is preferably 180-250 ℃, and further preferably 190-220 ℃; the high-temperature reaction time is preferably 7-11 h, and more preferably 8-10 h. After the high-temperature reaction is finished, the invention preferably also comprises the steps of adding diethylene glycol butyl ether and/or diethylene glycol methyl ether solvent to adjust the viscosity of the obtained resin; in the invention, the solid content of the high-solid low-viscosity alkyd resin is preferably 70 +/-2% (baking at 105 ℃ for 1h), and the viscosity is preferably 200-250 s (coating-4 viscometer, 25 ℃).
In the invention, the raw materials for preparing the protective coating comprise 8-15 parts by weight of heavy calcium carbonate, preferably 8-13 parts by weight of the high-solid low-viscosity alkyd resin. In the invention, the particle size of the heavy calcium carbonate is preferably 1100-1300 meshes, and more preferably 1200 meshes. In the invention, the heavy calcium carbonate is used as an extender pigment, and the film forming effect of the steel structure protective coating can be influenced when the heavy calcium carbonate is used in an excessive amount, and the mechanical property of a paint film of the steel structure protective coating can be influenced when the heavy calcium carbonate is used in an excessive amount. The heavy calcium carbonate is matched with other raw materials for use, so that the performance of the steel structure protective coating can be improved.
In the invention, the raw materials for preparing the protective coating comprise 6-10 parts by weight of alcohol ether solvent, preferably 7-9 parts by weight of the high-solid low-viscosity alkyd resin. In the invention, the alcohol ether solvent preferably comprises one or more of diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, diethylene glycol ethyl ether and tripropylene glycol methyl ether. In the invention, too much or too little of the alcohol ether solvent can affect the viscosity of the steel structure protective coating, thereby affecting the film forming effect and performance of the steel structure protective coating. The alcohol ether solvent is matched with other raw materials for use, so that the performance of the steel structure protective coating can be improved.
In the invention, the raw materials for preparing the protective coating comprise 0.3-0.5 part of organobentonite, preferably 0.32-0.4 part of organobentonite, more preferably 0.32 part of organobentonite, 0.34 part of organobentonite, 0.36 part of organobentonite, 0.38 part of organobentonite and 0.40 part of organobentonite, based on the weight parts of the alkyd resin with high solid content and low viscosity. In the present invention, the organobentonite functions to prevent precipitation of other raw materials; the excessive consumption of the organic bentonite can cause the excessive viscosity of the steel structure protective coating, and the excessive consumption cannot achieve the anti-settling effect. According to the invention, the organic bentonite is matched with other raw materials for use, so that the performance of the steel structure protective coating can be improved.
In the invention, the raw materials for preparing the protective coating comprise 0.2-0.4 part of wetting agent, preferably 0.22-0.4 part, more preferably 0.25 part, 0.3 part, 0.35 part or 0.40 part by weight of the high-solid low-viscosity alkyd resin. The wetting agent according to the invention is preferably a silicone oil. In the invention, the silicone oil can well wet the pigment and filler, thereby being beneficial to improving the grinding efficiency of the titanium dioxide and the heavy calcium carbonate and coating other raw materials by the low-viscosity alkyd resin and preventing the raw materials such as the titanium dioxide and the heavy calcium carbonate from flooding; too much wetting agent can cause shrinkage cavity of the steel structure protective coating paint film, and too little wetting agent can cause the steel structure protective coating paint film to be colored. The invention uses the wetting agent and other raw materials in a matching way, and can improve the performance of the steel structure protective coating.
In the invention, the raw materials for preparing the protective coating comprise 0.3-0.5 part of dispersant, preferably 0.35-0.5 part, more preferably 0.35 part, 0.4 part, 0.45 part or 0.5 part by weight of the high-solid low-viscosity alkyd resin. In the present invention, the dispersant preferably comprises a phosphate-based dispersant, preferably a dispersant of the DisperbYK-110 or DisperbYK-111 type. In the present invention, the dispersant functions to disperse the pigment filler; the excessive consumption of the dispersant can cause the drying of a paint film of the steel structure protective paint to be slow, and the excessive consumption can cause the floating color of the paint film of the steel structure protective paint and the precipitation of the paint. The invention uses the dispersant and other raw materials in a matching way, and can improve the performance of the steel structure protective coating.
In the invention, the raw materials for preparing the protective coating comprise 0.7-1 part of drier, preferably 0.75-1 part, more preferably 0.75 part, 0.8 part, 0.85 part, 0.9 part, 0.95 part or 1 part by weight of the alkyd resin with high solid content and low viscosity. In the invention, the drier comprises one or more of metal oxide, metal salt and rare earth drier; the metal in the metal oxide and metal salt independently comprises cobalt, manganese, iron, zinc or calcium. The rare earth elements in the rare earth drier comprise one or more of cerium, lanthanum and yttrium. In the invention, the drier is used for accelerating the drying of a steel structure protective coating paint film; the steel structure protective coating is easy to crust when the usage amount of the drier is too much, and the paint film of the steel structure protective coating is not easy to dry when the usage amount is too little. The drier is matched with other raw materials for use, so that the performance of the steel structure protective coating can be improved.
In the invention, the raw materials for preparing the protective coating comprise 0.2-0.3 part of anti-skinning agent, preferably 0.22-0.3 part, more preferably 0.22 part, 0.24 part, 0.26 part, 0.28 part or 0.3 part by weight of the high-solid low-viscosity alkyd resin. The anti-skinning agent is preferably methyl ethyl ketoxime. In the invention, the methyl ethyl ketoxime is used for preventing the steel structure protective coating from skinning in the storage process; the steel structure protective coating paint film is not dried due to excessive consumption of the anti-skinning agent, and the anti-skinning effect cannot be achieved due to too little consumption. The anti-skinning agent is matched with other raw materials, so that the performance of the steel structure protective coating can be improved.
In the invention, the raw materials for preparing the protective coating comprise 15-20 parts of titanium dioxide, preferably 15-18 parts of the high-solid low-viscosity alkyd resin by weight. In the invention, the titanium dioxide is used as a coloring pigment, and the excessive use of the titanium dioxide can influence the production cost of the steel structure protective coating, and the excessive use of the titanium dioxide can influence the covering power of the steel structure protective coating. In the invention, the titanium dioxide is preferably rutile type titanium dioxide, and more preferably chloride rutile type titanium dioxide. According to the invention, the titanium dioxide is matched with other raw materials for use, so that the performance of the steel structure protective coating can be improved.
The invention also provides a preparation method of the steel structure protective coating with high solid content and low VOC, which comprises the following steps:
mixing and grinding part of the alcohol ether solvent, part of the high-solid low-viscosity alkyd resin and the rest of the components to obtain slurry; the residual components are all components except the drier, the anti-skinning agent, the alcohol ether solvent and the high-solid low-viscosity alkyd resin;
and mixing the slurry, the residual high-solid low-viscosity alkyd resin, the drier, the residual alcohol ether solvent and the anti-skinning agent to obtain the protective coating.
In the present invention, the part of the high-solid low-viscosity alkyd resin preferably accounts for 65 to 75% of the total mass of the alkyd resin, more preferably 68 to 72%, and most preferably 70%. In the invention, the part of the alcohol ether solvent preferably accounts for 75-85% of the total mass of the alcohol ether solvent, more preferably 78-82%, and most preferably 80%.
In the invention, the mixing is preferably stirring mixing, and the stirring mixing speed is preferably 800-1000 rpm, more preferably 850-1000 rpm, and most preferably 900-1000 rpm; the invention adopts high stirring speed, and can improve the dispersion uniformity of the raw materials. In the invention, the mixing sequence is preferably that part of the high-solid low-viscosity alkyd resin and part of the alcohol ether solvent are subjected to first stirring and mixing, the wetting agent, the dispersing agent and the organic bentonite are sequentially added for second stirring and mixing, and then the titanium dioxide and the heavy calcium carbonate are added for third stirring and mixing. In the invention, the time for the first stirring and mixing, the second stirring and mixing and the third stirring and mixing is not specially limited, and the raw materials can be uniformly mixed. The invention adopts the mixing sequence, and can improve the dispersion uniformity of each raw material.
In the invention, the fineness of the slurry is preferably less than or equal to 40 mu m. In the invention, the grinding is preferably carried out in a sand mill, the rotating speed of the grinding machine is preferably 500-600 rpm, the grinding time is not particularly limited, and the fineness of the slurry can be ensured to meet the requirement.
In the invention, the residual alkyd resin with high solid content and low viscosity accounts for 25-35% of the total mass of the alkyd resin, more preferably 28-32%, and most preferably 30%; the total mass of the partial high-solid low-viscosity alkyd resin and the residual alkyd resin is 100 percent. In the invention, the part of the alcohol ether solvent preferably accounts for 15-25% of the total mass of the alcohol ether solvent, more preferably 18-22%, and most preferably 20%; the total mass of the partial alcohol ether solvents and the alcohol ether solvents is 100 percent.
In the present invention, the mixing is preferably stirring mixing, and the stirring mixing speed in the present invention is not particularly limited, and a stirring speed well known in the art may be used.
In the invention, the mixing sequence is preferably that the slurry, the residual high-solid low-viscosity alkyd resin and the drier are stirred and mixed, the residual alcohol ether solvent is added to adjust the viscosity, and then the anti-skinning agent is added to be stirred and mixed for 15 min.
After the mixing is completed, the invention preferably further comprises packaging the obtained steel structure protective coating. The present invention is not particularly limited to the packaging, and the packaging method well known in the art may be used.
The viscosity of the steel structure protective coating provided by the invention is preferably 190-210 s at 25 ℃.
The preparation method provided by the invention is characterized in that the high-solid low-viscosity alkyd resin is added in two times, the first time of adding the alkyd resin is to uniformly disperse the alkyd resin with a wetting agent, a dispersing agent, organic bentonite, titanium dioxide and heavy calcium carbonate, and the second time of adding the alkyd resin is to improve the performances of the paint, such as gloss, hardness, weather resistance and the like; if the additive is added at one time, firstly, the dispersion time is increased, the dispersion is not uniform, the dispersion efficiency of each raw material in the coating is influenced, the loss of electricity, cooling water and equipment is caused, and the production cost is greatly improved; secondly, the performance of the coating is not up to standard. The preparation method provided by the invention has simple process, and the prepared high-solid low-VOC protective coating is harmless to the environment and human body, green, safe and environment-friendly.
The invention also provides the application of the high-solid low-VOC protective coating in industrial corrosion prevention, preferably the application in steel structure corrosion prevention.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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
(1) Reacting soybean oil at 190 ℃ for 11h, and adjusting the viscosity of the resin to 200s by using diethylene glycol butyl ether to obtain high-solid low-viscosity alkyd resin;
(2) pre-dispersing: adding 6.3 parts of alcohol ether solvent and 45.5 parts of high-solid low-viscosity alkyd resin into a feeding dispersion cylinder according to parts by weight, and uniformly stirring; sequentially adding 0.25 part of silicone oil, 0.5 part of disperbYK-110 type dispersant and 0.3 part of organic bentonite, and dispersing at high speed for 15min under the condition of 1000 rpm; then adding 15 parts of rutile titanium dioxide and 10 parts of ground calcium carbonate in sequence, and stirring at high speed under the condition of 1000rpm to be in a uniform state; wherein the alcohol ether solvent is a mixed solvent of diethylene glycol methyl ether, tripropylene glycol methyl ether and diethylene glycol ethyl ether, and the volume ratio of the diethylene glycol methyl ether to the tripropylene glycol methyl ether to the diethylene glycol ethyl ether is 4:4: 2;
(3) grinding: sucking the obtained material into a sand mill by using a diaphragm pump or a gear pump, and grinding the material under the condition of 550rpm until the fineness of the slurry is less than or equal to 40 mu m to obtain the slurry in a stable state;
(4) paint mixing: and pumping the slurry into a paint mixing cylinder through a diaphragm pump or a gear pump, adding 19.5 parts of alkyd resin and 0.8 part of cobalt oxide/ferric oxide drier, uniformly stirring and mixing, adding 1.6 parts of alcohol ether solvent, adjusting viscosity until the viscosity is qualified, adding 0.25 part of methyl ethyl ketoxime, stirring for 15min, and packaging to obtain the protective coating.
Example 2
(1) The linseed oil reacts for 10 hours at the temperature of 200 ℃, diethylene glycol butyl ether is adopted to adjust the viscosity of the resin to 220s, and the high-solid low-viscosity alkyd resin is obtained;
(2) pre-dispersing: adding 5.8 parts of alcohol ether solvent and 42 parts of alkyd resin into a feeding dispersion cylinder according to parts by weight, and uniformly stirring; sequentially adding 0.2 part of silicone oil, 0.4 part of DisperbYK-111 type dispersant and 0.3 part of organic bentonite, and dispersing at high speed for 15min under the condition of 1000 rpm; then adding 16 parts of rutile titanium dioxide and 15 parts of ground calcium carbonate in sequence, and stirring at high speed under the condition of 1000rpm to be in a uniform state; wherein, the alcohol ether solvent is diethylene glycol monobutyl ether: the mixed solvent of the dipropylene glycol butyl ether, the volume ratio of the diethylene glycol butyl ether to the dipropylene glycol butyl ether is 3: 7;
(3) grinding: sucking the obtained material into a sand mill by using a diaphragm pump or a gear pump, and grinding the material under the condition of 550rpm until the fineness of the slurry is less than or equal to 30 mu m to obtain the slurry in a stable state;
(4) paint mixing: and pumping the slurry into a paint mixing cylinder through a diaphragm pump or a gear pump, adding 18 parts of alkyd resin and 0.7 part of zinc oxide/calcium oxide/manganese oxide drier, uniformly stirring and mixing, adding 1.4 parts of alcohol ether solvent, adjusting viscosity until the viscosity is qualified, adding 0.22 part of methyl ethyl ketoxime, stirring for 15min, and packaging to obtain the protective paint.
Example 3
(1) Reacting cottonseed oil for 8 hours at 220 ℃, and adjusting the viscosity of the resin to 250s by using diethylene glycol butyl ether to obtain high-solid low-viscosity alkyd resin;
(2) pre-dispersing: adding 7.9 parts of alcohol ether solvent and 44 parts of alkyd resin into a feeding dispersion cylinder according to parts by weight, and uniformly stirring; sequentially adding 0.3 part of silicone oil, 0.5 part of disperbYK-110 type dispersant and 0.35 part of organic bentonite, and dispersing at high speed for 15min under the condition of 1000 rpm; then, adding 17 parts of rutile type titanium dioxide and 8 parts of ground calcium carbonate in sequence, and stirring at high speed under the condition of 1000rpm to be in a uniform state; wherein the alcohol ether solvent is a mixed solvent of diethylene glycol methyl ether, diethylene glycol ethyl ether and tripropylene glycol methyl ether, and the volume ratio of the diethylene glycol methyl ether, the diethylene glycol ethyl ether and the tripropylene glycol methyl ether is 3:3: 4;
(3) grinding: sucking the obtained material into a sand mill by using a diaphragm pump or a gear pump, and grinding the material under the condition of 550rpm until the fineness of the slurry is less than or equal to 30 mu m to obtain the slurry in a stable state;
(4) paint mixing: pumping the slurry into a paint mixing cylinder through a diaphragm pump or a gear pump, adding 19 parts of alkyd resin and 0.75 part of rare earth drier, uniformly stirring and mixing, adding 2 parts of alcohol ether solvent, mixing until the viscosity is qualified, adding 0.2 part of methyl ethyl ketoxime, stirring for 15min, and packaging to obtain a protective coating; wherein the rare earth element in the rare earth drier is cerium.
Example 4
(1) Reacting cotton seed oil and soybean oil at 210 ℃ for 9h, and adjusting the resin viscosity to 240s by using diethylene glycol butyl ether to obtain alkyd resin;
(2) pre-dispersing: adding 5.5 parts of alcohol ether solvent and 42.7 parts of alkyd resin into a feeding dispersion cylinder according to parts by weight, and uniformly stirring; sequentially adding 0.3 part of silicone oil, 0.3 part of disperbYK-111 type dispersant and 0.3 part of organic bentonite, and dispersing at high speed for 15min under the condition of 1000 rpm; then, 18 parts of rutile titanium dioxide and 12 parts of ground calcium carbonate are sequentially added, and the mixture is stirred at a high speed under the condition of 1000rpm until the mixture is in a uniform state; wherein the alcohol ether solvent is a mixed solvent of dipropylene glycol methyl ether and diethylene glycol ethyl ether, and the volume ratio of the dipropylene glycol methyl ether to the diethylene glycol ethyl ether is 1: 1;
(3) grinding: sucking the obtained material into a sand mill by using a diaphragm pump or a gear pump, and grinding the material under the condition of 550rpm until the fineness of the slurry is less than or equal to 30 mu m to obtain the slurry in a stable state;
(4) paint mixing: and pumping the slurry into a paint mixing cylinder through a diaphragm pump or a gear pump, adding 18.3 parts of alkyd resin and 1 part of cobalt oxide/manganese oxide/iron oxide/zinc oxide drier, uniformly stirring and mixing, adding 1.4 parts of alcohol ether solvent, adjusting viscosity until the viscosity is qualified, adding 0.3 part of methyl ethyl ketoxime, stirring for 15min, and packaging to obtain the protective coating.
Comparative example 1
The alkyd resin protective coating is prepared according to the method of example 1, which is different from example 1 in that the alkyd resin is prepared by esterification reaction of polyol, polybasic acid and fatty acid by using fatty acid as a raw material through a traditional fatty acid method.
Test example 1
The protective coatings prepared in examples 1 to 4 and comparative example 1 were subjected to performance tests, and the test results are shown in table 1.
TABLE 1 Performance test results for protective coatings prepared in examples 1-4 and comparative example 1
As can be seen from Table 1, the flash point of the high-solid low-VOC protective coating provided by the invention is greatly higher than the required index, and other technical indexes also meet the requirements. The high-solid low-VOC protective coating provided by the invention has high flash point and is safer in the production, transportation and use processes; excellent acid resistance, alkali resistance, weather resistance and other properties; and the toxicity is low, and the environment is protected.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The high-solid-content low-VOC protective coating is characterized by comprising the following components in parts by weight:
55-65 parts of high-solid low-viscosity alkyd resin;
8-15 parts of heavy calcium carbonate;
6-10 parts of an alcohol ether solvent;
0.2-0.4 part of wetting agent;
0.3-0.5 part of organic bentonite;
0.3-0.5% of a dispersant;
0.7-1 part of a drier;
0.2-0.3 part of anti-skinning agent.
2. The high-solid low-VOC protective coating according to claim 1, wherein said high-solid low-viscosity alkyd resin is prepared by reacting natural vegetable oil at high temperature;
the high-temperature reaction is carried out at the temperature of 180-250 ℃ for 7-11 h.
3. The high-solid low-VOC protective coating according to claim 1 or 2, characterized by further comprising 15-20 parts of titanium dioxide, wherein the titanium dioxide is rutile titanium dioxide, and the particle size is 10-100 nm.
4. The high-solid low-VOC protective coating according to claim 3, wherein said heavy calcium carbonate has a particle size of 1100-1300 mesh.
5. The high-solid low-VOC protective coating according to claim 4, wherein said alcohol ether solvent comprises one or more of diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, diethylene glycol ethyl ether and tripropylene glycol methyl ether.
6. The high solids, low VOC protective coating of claim 1 or 2 or 4 or 5 wherein said wetting agent is a silicone oil; the dispersant comprises a phosphate dispersant; the drier comprises one or more of metal oxide, metal salt and rare earth drier; the anti-skinning agent is methyl ethyl ketoxime.
7. The high solids, low VOC protective coating of claim 6 wherein the metals in said metal oxide and metal salt independently comprise cobalt, manganese, iron, zinc or calcium; the rare earth elements in the rare earth drier comprise one or more of cerium, lanthanum and yttrium.
8. The preparation method of the high-solid low-VOC protective coating of any one of claims 1 to 7, characterized by comprising the following steps:
mixing and grinding part of the alcohol ether solvent, part of the high-solid low-viscosity alkyd resin and the rest of the components to obtain slurry; the residual components are all components except the drier, the anti-skinning agent, the alcohol ether solvent and the high-solid low-viscosity alkyd resin;
and mixing the slurry, the residual high-solid low-viscosity alkyd resin, the drier, the residual alcohol ether solvent and the anti-skinning agent to obtain the protective coating.
9. The preparation method of the high-solid low-VOC protective coating according to claim 8, characterized in that the alcohol ether solvent accounts for 75-85% of the total mass of the alcohol ether solvent;
the part of the high-solid low-viscosity alkyd resin accounts for 65-75% of the total mass of the high-solid low-viscosity alkyd resin;
the fineness of the slurry is less than or equal to 40 mu m.
10. Use of the high-solid low-VOC protective coating according to any one of claims 1 to 7 for steel structure protection.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011286473.4A CN112409893A (en) | 2020-11-17 | 2020-11-17 | High-solid-content low-VOC protective coating and preparation method and application thereof |
| PCT/CN2021/099700 WO2022105204A1 (en) | 2020-11-17 | 2021-06-11 | High-solid-content low-voc protective coating, preparation method therefor and use thereof |
| AU2021106937A AU2021106937A4 (en) | 2020-11-17 | 2021-08-24 | Protective coating with high solid and low voc, and preparation method and use thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011286473.4A CN112409893A (en) | 2020-11-17 | 2020-11-17 | High-solid-content low-VOC protective coating and preparation method and application thereof |
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| CN112409893A true CN112409893A (en) | 2021-02-26 |
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| CN202011286473.4A Pending CN112409893A (en) | 2020-11-17 | 2020-11-17 | High-solid-content low-VOC protective coating and preparation method and application thereof |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112409893A (en) |
| AU (1) | AU2021106937A4 (en) |
| WO (1) | WO2022105204A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114479625A (en) * | 2022-01-07 | 2022-05-13 | 湘江涂料科技有限公司 | High-flash-point alkyd resin protective finish |
| WO2022105204A1 (en) * | 2020-11-17 | 2022-05-27 | 江苏冠军科技集团股份有限公司 | High-solid-content low-voc protective coating, preparation method therefor and use thereof |
| CN114891426A (en) * | 2022-06-28 | 2022-08-12 | 江苏冠军科技集团股份有限公司 | High-flash-point alkyd protective coating composition for steel structure |
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| WO1997035901A1 (en) * | 1996-03-27 | 1997-10-02 | Akzo Nobel N.V. | Alkyd resins having a low dynamic viscosity for use in high-solids coatings |
| CN107603437A (en) * | 2017-09-30 | 2018-01-19 | 江苏冠军科技集团股份有限公司 | A kind of high solid steel structure anti-corrosion paint and preparation method thereof |
| CN109943206A (en) * | 2019-03-08 | 2019-06-28 | 安徽凤凰涂料科技有限公司 | A kind of safety industrial alkyd paint and preparation method thereof |
| CN110591523A (en) * | 2019-09-23 | 2019-12-20 | 江苏冠军科技集团股份有限公司 | High-flash-point alkyd resin protective coating and preparation method and application thereof |
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| CN109370394A (en) * | 2018-09-27 | 2019-02-22 | 合众（佛山）化工有限公司 | A kind of polyether-ether-ketone modified waterborne alkyd antirusting paint |
| CN112409893A (en) * | 2020-11-17 | 2021-02-26 | 江苏冠军科技集团股份有限公司 | High-solid-content low-VOC protective coating and preparation method and application thereof |
-
2020
- 2020-11-17 CN CN202011286473.4A patent/CN112409893A/en active Pending
-
2021
- 2021-06-11 WO PCT/CN2021/099700 patent/WO2022105204A1/en active Application Filing
- 2021-08-24 AU AU2021106937A patent/AU2021106937A4/en not_active Ceased
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| WO1997035901A1 (en) * | 1996-03-27 | 1997-10-02 | Akzo Nobel N.V. | Alkyd resins having a low dynamic viscosity for use in high-solids coatings |
| CN107603437A (en) * | 2017-09-30 | 2018-01-19 | 江苏冠军科技集团股份有限公司 | A kind of high solid steel structure anti-corrosion paint and preparation method thereof |
| CN109943206A (en) * | 2019-03-08 | 2019-06-28 | 安徽凤凰涂料科技有限公司 | A kind of safety industrial alkyd paint and preparation method thereof |
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| WO2022105204A1 (en) * | 2020-11-17 | 2022-05-27 | 江苏冠军科技集团股份有限公司 | High-solid-content low-voc protective coating, preparation method therefor and use thereof |
| CN114479625A (en) * | 2022-01-07 | 2022-05-13 | 湘江涂料科技有限公司 | High-flash-point alkyd resin protective finish |
| CN114891426A (en) * | 2022-06-28 | 2022-08-12 | 江苏冠军科技集团股份有限公司 | High-flash-point alkyd protective coating composition for steel structure |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2021106937A4 (en) | 2021-11-25 |
| WO2022105204A1 (en) | 2022-05-27 |
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