CN111961373A - Nano calcium carbonate powder water-based paint and preparation method thereof - Google Patents
Nano calcium carbonate powder water-based paint and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a nano calcium carbonate powder water-based paint which comprises the following raw materials in parts by weight: 30-40 parts of acrylic resin, 5-10 parts of epoxy resin, 15-25 parts of styrene-acrylic emulsion, 10-15 parts of modified nano calcium carbonate, 5-8 parts of kaolin, 5-8 parts of titanium dioxide, 3-5 parts of modified hydrotalcite powder, 0.5-1 part of film-forming agent, 0.5-1 part of flatting agent, 1-2 parts of antifreeze agent and 60-80 parts of water. The preparation method of the nano calcium carbonate powder water-based paint comprises the steps of grinding kaolin and titanium dioxide respectively, sieving, mixing, adding modified hydrotalcite powder and modified nano calcium carbonate, stirring and mixing uniformly, then sequentially adding water, acrylic resin, epoxy resin and styrene-acrylic emulsion, stirring, adding a film-forming agent, a leveling agent and an anti-freezing agent, stirring, and carrying out ultrasonic treatment to obtain the nano calcium carbonate powder water-based paint. The water-based paint with good rheological property and high water resistance can be obtained by the method.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a nano calcium carbonate powder water-based coating and a preparation method thereof.
Background
Coatings using water as a solvent or as a dispersion medium may be referred to as waterborne coatings. Aqueous coatings are divided into two broad categories depending on the binder class in the coating: natural water paint of natural substance or mineral matter (such as potassium silicate) and petrochemical water paint of synthetic resin (such as acrylic resin), and the water paint includes 3 kinds of water soluble paint, water reducible paint and water dispersible paint (latex paint). The water-based paint has the characteristics of environmental protection, no toxicity, no pungent smell, no harm to the environment, few volatile matters, high safety, non-combustibility, no explosion and the like, can be directly coated and constructed on wet surfaces and in a humid environment, has good adaptability to material surfaces and strong coating adhesion, and can be cleaned by water, so that the consumption of cleaning solvents is greatly reduced. In addition, the electrophoretic coating of the water-based paint is uniform and flat, has good flattening performance, can coat a certain thickness of coating on the inner cavity, the welding seam, the edge and the edge part, and has good protection performance. However, the aqueous coating materials also have significant drawbacks, such as poor dispersion stability against strong mechanical force, and when the flow rate in the transfer pipe is rapidly changed, the dispersed particles are compressed into solid particles, causing pockmarks in the coating film; the water-based coating has large evaporation latent heat and large baking energy consumption. Baking the cathode electrophoretic coating at 180 ℃; the time for completely drying the latex paint is long; the water-based paint has a problem of poor water resistance, which causes poor stability of the paint and a bath solution and poor water resistance of a coating film. The medium of the water-based paint is usually slightly alkaline, ester bonds in resin are easy to hydrolyze to degrade molecular chains, and the stability of the paint and bath solution and the performance of a coating film are influenced. Therefore, how to improve the performance of the water-based paint by adding a proper functional filler in the water-based paint has become a hot research focus at present.
Disclosure of Invention
Aiming at the defects, the invention discloses a nano calcium carbonate powder water-based paint and a preparation method thereof, and the water-based paint with good rheological property and high water resistance is obtained.
The invention is realized by adopting the following technical scheme:
the nano calcium carbonate powder water-based paint comprises the following raw materials in parts by weight:
30-40 parts of acrylic resin, 5-10 parts of epoxy resin, 15-25 parts of styrene-acrylic emulsion, 10-15 parts of modified nano calcium carbonate, 5-8 parts of kaolin, 5-8 parts of titanium dioxide, 3-5 parts of modified hydrotalcite powder, 0.5-1 part of film-forming agent, 0.5-1 part of flatting agent, 1-2 parts of antifreeze agent and 60-80 parts of water;
stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 60-90 g/L, then adding urea, stirring for 15-20 min under the ultrasonic condition, then heating to 50-60 ℃, keeping the temperature constant, adding ammonia water to adjust the pH value to 7-8, then introducing carbon dioxide to perform carbonization reaction for 30-60 min, wherein the flow of the carbon dioxide is 100-150L/h, then adding stearic acid and sodium dodecyl benzene sulfonate, continuing introducing the carbon dioxide to perform carbonization reaction for 1-2 h, and then performing filter pressing, drying and crushing on the slurry to obtain modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100 (2-5) to 1-3;
stirring and mixing starch and water according to the mass ratio of 1 (3-5), then ultrasonically dispersing for 10-15 min under the condition of ultrasonic waves, heating to 70-80 ℃, keeping the temperature, then adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 2-3 h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 1-3% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 20-30 h to obtain the modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40.
A preparation method of a nano calcium carbonate powder water-based paint comprises the following steps:
(1) stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 60-90 g/L, then adding urea, stirring for 15-20 min under the ultrasonic condition, heating to 50-60 ℃ and keeping the temperature constant, then adding ammonia water to adjust the pH value to 7-8, then introducing carbon dioxide to perform carbonization reaction for 30-60 min, wherein the flow of the carbon dioxide is 100-150L/h, then adding stearic acid and sodium dodecyl benzene sulfonate, continuing introducing the carbon dioxide to perform carbonization reaction for 1-2 h, and then performing pressure filtration, drying and crushing on the slurry to obtain modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100 (2-5) to 1-3;
(2) stirring and mixing starch and water according to the mass ratio of 1 (3-5), then performing ultrasonic dispersion for 10-15 min under the condition of ultrasonic waves, heating to 70-80 ℃, keeping the temperature, then adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 2-3 h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 1-3% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 20-30 h to obtain modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40;
(3) respectively putting kaolin and titanium dioxide into a grinding machine for grinding, then sieving and mixing the ground kaolin and titanium dioxide, then adding modified hydrotalcite powder and modified nano calcium carbonate, and stirring and mixing uniformly to obtain a mixture A;
(4) and sequentially adding water, acrylic resin, epoxy resin and styrene-acrylic emulsion into the mixture A, stirring for 10-15 min, then adding a film forming agent, a flatting agent and an anti-freezing agent, stirring for 45-60 min, and then carrying out ultrasonic treatment for 20-30 min under the ultrasonic condition to obtain the nano calcium carbonate powder water-based paint.
Furthermore, the purity of the nano calcium hydroxide is more than 99.5%, and the particle size is 10-80 nm.
Further, the stirring speed in the step (1) is 200-300 r/min.
Further, the frequency of the ultrasonic waves in the step (1), the step (2) and the step (4) is 25-30 MHz.
Further, in the step (3), the ground kaolin and titanium dioxide are sieved by a (100-150) -mesh sieve.
Further, in the step (3), the stirring speed is 50-100 r/min, and the stirring time is 15-20 min.
Further, the film forming agent is 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the flatting agent is polydimethylsiloxane copolymer; the antifreeze is obtained by mixing ethylene glycol and propylene glycol in equal volume.
Compared with the prior art, the technical scheme has the following beneficial effects:
1. the invention has simple process, is beneficial to automatic production control, and adopts the modified nano calcium carbonate and the modified hydrotalcite as the filler. The high-quality water-based paint with good rheological property and high water resistance is prepared by mixing acrylic resin, epoxy resin and styrene-acrylic emulsion to prepare a film-forming base material, and then adding a plurality of auxiliary agents such as kaolin, titanium dioxide, a film-forming agent, a flatting agent, an antifreeze agent and the like.
2. According to the invention, nano calcium hydroxide is used as a raw material, a carbonization reaction is carried out under the condition of ultrasonic waves, urea is added in the carbonization process as an organic amine salt for improving and controlling the crystal form of nano calcium carbonate, the generation of nano calcium carbonate crystals with smaller crystal forms is promoted, stearic acid and sodium dodecyl benzene sulfonate are added after the carbonization reaction is carried out for a period of time to carry out surface modification on the generated nano calcium carbonate particles, the surface performance of the nano calcium carbonate is improved, the dispersity of the nano calcium carbonate is improved, finally, the modified nano calcium carbonate with uniform particle distribution, good dispersity and no agglomeration phenomenon is obtained, the rheological property and the tank opening effect of the coating can be effectively improved by adding the modified calcium carbonate into the water-based coating, and the water resistance.
3. According to the invention, starch and double-chain quaternary ammonium salt Gemini amphiphilic molecules are used for carrying out surface modification on the talcum powder, so that the dispersity and the hydrophilicity of the talcum powder are improved, the dispersity of the talcum powder in the water-based paint is improved, and the agglomeration phenomenon after the talcum powder is added into the water-based paint is prevented.
Detailed Description
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. The specific experimental conditions and methods not indicated in the following examples are generally conventional means well known to those skilled in the art.
Example 1:
the nano calcium carbonate powder water-based paint comprises the following raw materials in parts by weight:
30 parts of acrylic resin, 8 parts of epoxy resin, 25 parts of styrene-acrylic emulsion, 15 parts of modified nano calcium carbonate, 5 parts of kaolin, 7 parts of titanium dioxide, 3 parts of modified hydrotalcite powder, 0.5 part of film-forming agent, 0.6 part of flatting agent, 2 parts of antifreeze agent and 60 parts of water; the film former is 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the flatting agent is polydimethylsiloxane copolymer; the antifreeze is obtained by mixing ethylene glycol and propylene glycol in equal volume;
stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 60g/L, then adding urea, stirring for 15min under the ultrasonic condition, then heating to 55 ℃ for constant temperature, adding ammonia water to adjust the pH value to 7.5, then introducing carbon dioxide to perform carbonization reaction for 45min, wherein the flow of the carbon dioxide is 120L/h, then adding stearic acid and sodium dodecyl benzene sulfonate, continuing introducing the carbon dioxide to perform carbonization reaction for 1h, and then performing pressure filtration, drying and crushing on the slurry to obtain the modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100:2: 2; the particle size of the prepared modified nano calcium carbonate product is 1-10 nm, and the specific surface area is 113m2/g；
The preparation method of the modified water talcum powder comprises the steps of stirring and mixing starch and water according to the mass ratio of 1:3, then carrying out ultrasonic dispersion for 10min under the ultrasonic condition, heating to 70 ℃, keeping the temperature, then adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 2h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 3% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 20h to obtain the modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40.
The preparation method of the nano calcium carbonate powder water-based paint comprises the following steps:
(1) stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 60g/L, then adding urea, stirring for 15min at the speed of 200r/min under the ultrasonic condition with the frequency of 25MHz, then heating to 55 ℃ and keeping the temperature, then adding ammonia water to adjust the pH value to 7.5, then introducing carbon dioxide to carry out carbonization reaction for 45min, wherein the flow rate of the carbon dioxide is 120L/h, then adding stearic acid and sodium dodecyl benzene sulfonate, continuing introducing the carbon dioxide to carry out carbonization reaction for 1h, and then carrying out pressure filtration, drying and crushing on the slurry to obtain modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100:2: 2; the purity of the nano calcium hydroxide is more than 99.5%, and the particle size is 10-80 nm;
(2) stirring and mixing starch and water according to a mass ratio of 1:3, then performing ultrasonic dispersion for 10min under the ultrasonic condition with the frequency of 25MHz, then heating to 70 ℃, keeping the temperature, adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 2h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 3% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 20h to obtain modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40;
(3) respectively putting kaolin and titanium dioxide into a grinder for grinding, then sieving the ground kaolin and titanium dioxide with a 100-mesh sieve, mixing, adding modified hydrotalcite powder and modified nano calcium carbonate, stirring for 15min under the stirring condition of the speed of 50r/min, and uniformly mixing to obtain a mixture A;
(4) and sequentially adding water, acrylic resin, epoxy resin and styrene-acrylic emulsion into the mixture A, stirring for 12min, then adding a film-forming agent, a flatting agent and an anti-freezing agent, stirring for 55min, and then carrying out ultrasonic treatment for 20min under the ultrasonic condition of the frequency of 25MHz to obtain the nano calcium carbonate powder water-based paint.
Example 2:
the nano calcium carbonate powder water-based paint comprises the following raw materials in parts by weight:
35 parts of acrylic resin, 5 parts of epoxy resin, 20 parts of styrene-acrylic emulsion, 12 parts of modified nano calcium carbonate, 6 parts of kaolin, 5 parts of titanium dioxide, 4 parts of modified hydrotalcite powder, 0.8 part of film-forming agent, 0.5 part of flatting agent, 1.5 parts of antifreeze agent and 70 parts of water; the film former is 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the flatting agent is polydimethylsiloxane copolymer; the antifreeze is obtained by mixing ethylene glycol and propylene glycol in equal volume;
stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 75g/L, then adding urea and stirring for 18min under the ultrasonic condition, then heating to 60 ℃ and keeping the temperature constant, then adding ammonia water to adjust the pH value to 7, then introducing carbon dioxide to carry out carbonization reaction for 30min, wherein the flow rate of the carbon dioxide is 150L/h, then adding stearic acid and sodium dodecyl benzene sulfonate to continue introducing the carbon dioxide to carry out carbonization reaction for 1.5h, and then carrying out pressure filtration, drying and crushing on the slurry to obtain the modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100:4: 1; the particle size of the prepared modified nano calcium carbonate product is 1-10 nm, and the specific surface area is 108m2/g；
The preparation method of the modified water talcum powder comprises the steps of stirring and mixing starch and water according to the mass ratio of 1:4, then carrying out ultrasonic dispersion for 12min under the ultrasonic condition, heating to 75 ℃, keeping the temperature constant, then adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 2.5h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 1% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 25h to obtain the modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40.
The preparation method of the nano calcium carbonate powder water-based paint comprises the following steps:
(1) stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 75g/L, then adding urea, stirring for 18min at the speed of 250r/min under the ultrasonic condition with the frequency of 28MHz, then heating to the constant temperature of 60 ℃, adding ammonia water to adjust the pH value to 7, then introducing carbon dioxide to perform carbonization reaction for 30min, wherein the flow rate of the carbon dioxide is 150L/h, then adding stearic acid and sodium dodecyl benzene sulfonate, continuing introducing the carbon dioxide to perform carbonization reaction for 1.5h, and then performing pressure filtration, drying and crushing on the slurry to obtain modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100:4: 1; the purity of the nano calcium hydroxide is more than 99.5%, and the particle size is 10-80 nm;
(2) stirring and mixing starch and water according to a mass ratio of 1:4, then performing ultrasonic dispersion for 12min under the ultrasonic condition with the frequency of 28MHz, then heating to 75 ℃, keeping the temperature, then adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 2.5h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 1% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 25h to obtain modified hydrotalcite powder; the mass ratio of the talcum powder to the starch is 1: 40;
(3) respectively putting kaolin and titanium dioxide into a grinder for grinding, then sieving the ground kaolin and titanium dioxide with a 120-mesh sieve, mixing, adding modified hydrotalcite powder and modified nano calcium carbonate, stirring at the speed of 70r/min for 18min, and uniformly mixing to obtain a mixture A;
(4) and sequentially adding water, acrylic resin, epoxy resin and styrene-acrylic emulsion into the mixture A, stirring for 10min, then adding a film-forming agent, a flatting agent and an anti-freezing agent, stirring for 60min, and then carrying out ultrasonic treatment for 25min under the ultrasonic condition of the frequency of 28MHz to obtain the nano calcium carbonate powder water-based paint.
Example 3:
the nano calcium carbonate powder water-based paint comprises the following raw materials in parts by weight:
40 parts of acrylic resin, 10 parts of epoxy resin, 15 parts of styrene-acrylic emulsion, 10 parts of modified nano calcium carbonate, 8 parts of kaolin, 8 parts of titanium dioxide, 5 parts of modified hydrotalcite powder, 1 part of film-forming agent, 1 part of flatting agent, 1 part of antifreeze agent and 80 parts of water; the film former is 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the flatting agent is polydimethylsiloxane copolymer; the antifreeze is obtained by mixing ethylene glycol and propylene glycol in equal volume;
preparation method of modified nano calcium carbonateStirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 90g/L, then adding urea and stirring for 20min under the condition of ultrasonic waves, then heating to 50 ℃ and keeping the temperature constant, then adding ammonia water to adjust the pH value to 8, then introducing carbon dioxide to perform carbonization reaction for 60min, wherein the flow rate of the carbon dioxide is 100L/h, then adding stearic acid and sodium dodecyl benzene sulfonate to continue introducing the carbon dioxide to perform carbonization reaction for 2h, and then performing pressure filtration, drying and crushing on the slurry to obtain modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100:5: 3; the particle size of the prepared modified nano calcium carbonate product is 1-10 nm, and the specific surface area is 109m2/g；
The preparation method of the modified water talcum powder comprises the steps of stirring and mixing starch and water according to the mass ratio of 1:5, then carrying out ultrasonic dispersion for 15min under the ultrasonic condition, heating to 80 ℃, keeping the temperature, then adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 3h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 2% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 30h to obtain the modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40.
The preparation method of the nano calcium carbonate powder water-based paint comprises the following steps:
(1) stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 90g/L, then adding urea, stirring for 20min at the speed of 300r/min under the ultrasonic condition with the frequency of 30MHz, then heating to 50 ℃ and keeping the temperature, then adding ammonia water to adjust the pH value to 8, then introducing carbon dioxide to perform carbonization reaction for 60min, wherein the flow rate of the carbon dioxide is 100L/h, then adding stearic acid and sodium dodecyl benzene sulfonate, continuing introducing the carbon dioxide to perform carbonization reaction for 2h, and then performing pressure filtration, drying and crushing on the slurry to obtain modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100:5: 3; the purity of the nano calcium hydroxide is more than 99.5%, and the particle size is 10-80 nm;
(2) stirring and mixing starch and water according to the mass ratio of 1:5, then performing ultrasonic dispersion for 15min under the ultrasonic condition with the frequency of 30MHz, then heating to 80 ℃, keeping the temperature, adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 3h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 2% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 30h to obtain modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40;
(3) respectively putting kaolin and titanium dioxide into a grinder for grinding, then sieving the ground kaolin and titanium dioxide with a 150-mesh sieve, mixing, adding modified hydrotalcite powder and modified nano calcium carbonate, stirring at the speed of 100r/min for 20min, and uniformly mixing to obtain a mixture A;
(4) and sequentially adding water, acrylic resin, epoxy resin and styrene-acrylic emulsion into the mixture A, stirring for 15min, then adding a film-forming agent, a flatting agent and an anti-freezing agent, stirring for 45min, and then carrying out ultrasonic treatment for 30min under the ultrasonic condition of the frequency of 30MHz to obtain the nano calcium carbonate powder water-based paint.
Experimental example:
the aqueous coating materials prepared in examples 1 to 3 were tested according to the relevant standards, namely, determination of water resistance of paint film (GB/T1733-1993), determination of flexibility of paint film (GB/T1731-1993), determination of neutral salt spray resistance of paints and varnishes (GB/T1771-2007), determination of impact resistance of paint film (GB/T1732-1993), acid resistance (GB/T1763-1979) and alkali resistance (GB/1763-1979), and the results are shown in Table 1.
TABLE 1 Performance test results of the aqueous coating materials prepared in examples 1 to 3
As can be seen from the test results, the water-based paint prepared by the method has the advantages of good water resistance, good flexibility, salt mist resistance, acid and alkali resistance and the like.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A nano calcium carbonate powder water-based paint is characterized in that: the composite material comprises the following raw materials in parts by mass:
30-40 parts of acrylic resin, 5-10 parts of epoxy resin, 15-25 parts of styrene-acrylic emulsion, 10-15 parts of modified nano calcium carbonate, 5-8 parts of kaolin, 5-8 parts of titanium dioxide, 3-5 parts of modified hydrotalcite powder, 0.5-1 part of film-forming agent, 0.5-1 part of flatting agent, 1-2 parts of antifreeze agent and 60-80 parts of water;
stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 60-90 g/L, then adding urea, stirring for 15-20 min under the ultrasonic condition, then heating to 50-60 ℃, keeping the temperature constant, adding ammonia water to adjust the pH value to 7-8, then introducing carbon dioxide to perform carbonization reaction for 30-60 min, wherein the flow of the carbon dioxide is 100-150L/h, then adding stearic acid and sodium dodecyl benzene sulfonate, continuing introducing the carbon dioxide to perform carbonization reaction for 1-2 h, and then performing filter pressing, drying and crushing on the slurry to obtain modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100 (2-5) to 1-3;
stirring and mixing starch and water according to the mass ratio of 1 (3-5), then ultrasonically dispersing for 10-15 min under the condition of ultrasonic waves, heating to 70-80 ℃, keeping the temperature, then adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 2-3 h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 1-3% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 20-30 h to obtain the modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40.
2. The preparation method of the nano calcium carbonate powder water-based paint according to claim 1, which is characterized by comprising the following steps: the method comprises the following steps:
(1) stirring and mixing nano calcium hydroxide and deionized water to obtain slurry, wherein the concentration of the nano calcium hydroxide in the slurry is 60-90 g/L, then adding urea, stirring for 15-20 min under the ultrasonic condition, heating to 50-60 ℃ and keeping the temperature constant, then adding ammonia water to adjust the pH value to 7-8, then introducing carbon dioxide to perform carbonization reaction for 30-60 min, wherein the flow of the carbon dioxide is 100-150L/h, then adding stearic acid and sodium dodecyl benzene sulfonate, continuing introducing the carbon dioxide to perform carbonization reaction for 1-2 h, and then performing pressure filtration, drying and crushing on the slurry to obtain modified nano calcium carbonate; the mass ratio of stearic acid to sodium dodecyl benzene sulfonate is 100 (2-5) to 1-3;
(2) stirring and mixing starch and water according to the mass ratio of 1 (3-5), then performing ultrasonic dispersion for 10-15 min under the condition of ultrasonic waves, heating to 70-80 ℃, keeping the temperature, then adding double-chain quaternary ammonium salt Gemini amphiphilic molecules, continuously stirring for 2-3 h, wherein the adding amount of the double-chain quaternary ammonium salt Gemini amphiphilic molecules is 1-3% of the mass of the starch, then adding talcum powder, heating to 90 ℃, and continuously stirring for 20-30 h to obtain modified water talcum powder; the mass ratio of the talcum powder to the starch is 1: 40;
(3) respectively putting kaolin and titanium dioxide into a grinding machine for grinding, then sieving and mixing the ground kaolin and titanium dioxide, then adding modified hydrotalcite powder and modified nano calcium carbonate, and stirring and mixing uniformly to obtain a mixture A;
(4) and sequentially adding water, acrylic resin, epoxy resin and styrene-acrylic emulsion into the mixture A, stirring for 10-15 min, then adding a film forming agent, a flatting agent and an anti-freezing agent, stirring for 45-60 min, and then carrying out ultrasonic treatment for 20-30 min under the ultrasonic condition to obtain the nano calcium carbonate powder water-based paint.
3. The method for preparing the nano calcium carbonate powder water-based paint according to claim 2 is characterized in that: the purity of the nano calcium hydroxide is more than 99.5%, and the particle size is 10-80 nm.
4. The method for preparing the nano calcium carbonate powder water-based paint according to claim 2 is characterized in that: the stirring speed in the step (1) is 200-300 r/min.
5. The method for preparing the nano calcium carbonate powder water-based paint according to claim 2 is characterized in that: the frequency of the ultrasonic waves in the step (1), the step (2) and the step (4) is 25-30 MHz.
6. The method for preparing the nano calcium carbonate powder water-based paint according to claim 2 is characterized in that: and (3) sieving the ground kaolin and titanium dioxide by a sieve of 100-150 meshes.
7. The method for preparing the nano calcium carbonate powder water-based paint according to claim 2 is characterized in that: in the step (3), the stirring speed is 50-100 r/min, and the stirring time is 15-20 min.
8. The method for preparing the nano calcium carbonate powder water-based paint according to claim 2 is characterized in that: the film former is 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the flatting agent is polydimethylsiloxane copolymer; the antifreeze is obtained by mixing ethylene glycol and propylene glycol in equal volume.
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