CN112852213A - Preparation method of hyperbranched water-based dispersant - Google Patents
Preparation method of hyperbranched water-based dispersant Download PDFInfo
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Abstract
The invention is suitable for the technical field of dispersing agents, and provides a preparation method of a hyperbranched water-based dispersing agent, which is characterized in that a styrene-maleic anhydride copolymer and superfine inorganic powder are fused to prepare copolymer slurry, wherein the styrene has a benzene ring structure and has a good dispersing effect on phthalocyanine paint carriers, and the maleic anhydride is used as an anchoring group for dispersing the paint carriers, so that the dispersing effect is obvious, and the adhesion capability and the viscosity of the superfine inorganic powder are improved by utilizing the copolymerization reaction of the styrene and the maleic anhydride; meanwhile, the modified nano titanium dioxide is added, so that the dispersibility and weather resistance of the hyperbranched water-based dispersant are further improved, and the adhesion time of the water-based paint carrier and a wall body is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of dispersants, and particularly relates to a preparation method of a hyperbranched water-based dispersant.
Background
The molecular structure of the traditional dispersant has limitations, the oleophilic group does not have enough carbon chain length, can not be firmly combined on the surface of particles with higher polarity or polarity, and is easy to desorb to cause the re-flocculation of the dispersed ions; the hydrophilic group is less, and can not generate enough steric hindrance effect in an aqueous dispersion system to play a stabilizing role. In order to overcome the limitation of the traditional dispersant in a water-phase dispersion system, a novel hyperdispersant is developed, has unique dispersion effect on a water system, and is mainly characterized in that: the particles are quickly and fully adsorbed on the surfaces of the particles and a layer of hydration film is formed on the surfaces of the particles, so that the grinding time for reaching the qualified particle fineness is shortened; the solid particle content in the grinding base material can be greatly improved, processing equipment is saved, processing energy consumption is reduced, the dispersion is uniform, the stability is good, and therefore the final use performance of a dispersion system is obviously improved.
The hyperbranched dispersant is another highly effective multifunctional dispersant which attracts attention in recent years, the substance has a dendritic structure, is in a unique three-dimensional quasi-spherical stereo structure and contains a large number of end groups and molecular cavities, compared with a common supramolecular dispersant, the hyperbranched multi-end structure of the hyperbranched multi-end structure enables the supramolecular dispersant to have a large number of anchoring groups, so that the adsorption force between the supramolecular dispersant and pigment particles can be greatly increased, and the long solvatable chain of the hyperbranched multi-end structure enables a thicker adsorption layer to be formed on the surface of the pigment, so that more effective steric hindrance and electrostatic repulsion are provided. More importantly, the hyperbranched structure has better film-forming property and crosslinking function, and has special function for fixing the particles on the base material. In addition, the low viscosity of the hyperbranched polymer can also obviously improve the solid content of a dispersion system, reduce the using amount of a dispersing agent and reduce the cost. Meanwhile, a large number of functional groups on the periphery of the hyperbranched structure are subjected to modification such as esterification and amination, so that the hyperbranched structure has more functionality, can be further applied to industries such as textile dyeing and finishing and chemical engineering, and has a wide application prospect.
The hyperbranched dispersant in the prior art has poor adhesion capability to a coating carrier, so that the viscosity of the coating carrier is reduced, the hyperbranched dispersant cannot be firmly adhered to a wall, the wall adhesion time is short, and the use stability cannot be ensured.
Disclosure of Invention
The embodiment of the invention provides a preparation method of a hyperbranched water-based dispersant, which is characterized in that a styrene-maleic anhydride copolymer and superfine inorganic powder are fused to prepare copolymer slurry, wherein the styrene has a benzene ring structure and has a good dispersion effect on phthalocyanine paint carriers, and the maleic anhydride is used as an anchoring group for dispersing the paint carriers, so that the dispersion effect is obvious, and the adhesion capability and the viscosity of the superfine inorganic powder are improved by utilizing the copolymerization reaction of the styrene and the maleic anhydride; meanwhile, the modified nano titanium dioxide is added, so that the dispersibility and weather resistance of the hyperbranched water-based dispersant are further improved, and the adhesion time of the water-based paint carrier and a wall body is greatly prolonged.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a hyperbranched water-based dispersant comprises the following steps:
1) adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry;
2) putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution into the container, stirring for 10-15 min, filtering, adding acrylic acid into the container, standing and soaking for 1-2 h at the temperature of 45-50 ℃ to obtain a modified nano titanium dioxide solution;
3) mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing nitrogen for protection, and stirring for 20-25min to obtain mixed slurry;
4) forming atomized liquid drops by the mixed slurry through an atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber;
5) and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Further, the solid content of the copolymer slurry in the step 1) is 30-38%.
Further, the mass fraction of the sodium hydroxide solution in the step 2) is 30-50%.
Further, the nitrogen pressure in the step 3) is 0.35-0.4 MPa.
Further, the rotating speed of the stirring kettle in the step 3) is 800-.
Further, the atomizer in the step 4) is an ultrasonic atomizer.
Further, the preparation method of the modified nano titanium dioxide in the step 2) comprises the following steps: mixing the nano titanium dioxide mixture, the coupling agent, the absolute ethyl alcohol and the deionized water, carrying out ultrasonic treatment on the obtained mixed solution, drying, washing with the absolute ethyl alcohol after drying, and naturally drying to obtain the modified nano titanium dioxide.
Further, the nano titanium dioxide mixture is formed by mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3 (1-5).
Further, the mass ratio of the nano titanium dioxide mixture to the coupling agent to the anhydrous ethanol to the deionized water is 5:2:3: 4.
Further, the coupling agent is a titanate.
The invention has the following beneficial effects:
the invention fuses styrene-maleic anhydride copolymer and superfine inorganic powder to prepare copolymer slurry, wherein styrene has a benzene ring structure and has good dispersion effect on phthalocyanine paint carriers, and maleic anhydride is used as an anchoring group for dispersing the paint carriers and has obvious dispersion effect, and the copolymerization reaction of the styrene-maleic anhydride copolymer and the maleic anhydride improves the adhesive capacity and viscosity of the superfine inorganic powder; meanwhile, the modified nano titanium dioxide is added, so that the dispersibility and weather resistance of the hyperbranched water-based dispersant are further improved, and the adhesion time of the water-based paint carrier and a wall body is greatly prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The styrene-maleic anhydride copolymer is fused with the superfine inorganic powder to prepare copolymer slurry, wherein the styrene has a benzene ring structure and has a good dispersing effect on phthalocyanine paint carriers, the maleic anhydride is used as an anchoring group for dispersing the paint carriers, the dispersing effect is obvious, and the copolymerization reaction of the styrene-maleic anhydride copolymer and the superfine inorganic powder is utilized to improve the adhesive capacity of the superfine inorganic powder;
the modified nano titanium dioxide is added, so that the dispersibility and weather resistance of the hyperbranched water-based dispersant are further improved, and the adhesion degree and gloss feeling of the water-lifting coating carrier and a wall body are further improved.
Specifically, the embodiment of the invention provides a preparation method of a hyperbranched water-based dispersant, which comprises the following steps:
1) adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry;
2) putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution into the container, stirring for 10-15 min, filtering, adding acrylic acid into the container, standing and soaking for 1-2 h at the temperature of 45-50 ℃ to obtain a modified nano titanium dioxide solution;
3) mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing nitrogen for protection, and stirring for 20-25min to obtain mixed slurry;
4) forming atomized liquid drops by the mixed slurry through an atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber;
5) and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
In the embodiment of the invention, the solid content of the copolymer slurry in the step 1) is 30-38%.
In the embodiment of the invention, the mass fraction of the sodium hydroxide solution in the step 2) is 30-50%.
In the embodiment of the invention, the nitrogen pressure in the step 3) is 0.35-0.4 MPa.
In the embodiment of the invention, the rotating speed of the stirring kettle in the step 3) is 800-.
In the embodiment of the invention, the atomizer in the step 4) is an ultrasonic atomizer.
In the embodiment of the invention, the preparation method of the modified nano titanium dioxide in the step 2) comprises the following steps: mixing the nano titanium dioxide mixture, the coupling agent, the absolute ethyl alcohol and the deionized water, carrying out ultrasonic treatment on the obtained mixed solution, drying, washing with the absolute ethyl alcohol after drying, and naturally drying to obtain the modified nano titanium dioxide.
In the embodiment of the invention, the nano titanium dioxide mixture is formed by mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3 (1-5).
In the embodiment of the invention, the mass ratio of the nano titanium dioxide mixture to the coupling agent to the absolute ethyl alcohol to the deionized water is 5:2:3: 4.
In the embodiment of the invention, the coupling agent is titanate.
The technical solution and the technical effect of the present invention will be further described by specific examples.
Example 1
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 30% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 2
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 30% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:2 to obtain a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is finished, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 3
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 30% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 1:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 4
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 30% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:4 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 5
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 30% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:5 to obtain a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is finished, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 6
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 31% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 7
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 32% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 8
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 33% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 9
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 34% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 10
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 35% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 11
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 36% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 12
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 37% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Example 13
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 38% for later use; mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Control group
Taking a common dispersant sold in the market.
The dispersants prepared in the above examples 1 to 13 and the control were numbered, each dispersant was mixed with the same paint vehicle, and the vehicle viscosity and wall adhesion time were measured, and the specific measurement results are shown in table 1 below:
TABLE 1
As can be seen from Table 1, the viscosity and the adhesion time of the paint vehicle using the hyperbranched aqueous dispersant prepared by the present invention are greatly improved compared to those using commercially available ordinary dispersants, wherein the hyperbranched aqueous dispersant prepared in example 9 has the best dispersion effect and adhesion; according to the embodiments 1-5, when the mixing mass ratio of the anatase titanium dioxide to the rutile titanium dioxide is 1:1, the prepared hyperbranched aqueous dispersant has the best dispersion effect and adhesive force; according to examples 1 and 6 to 13, when the solid content of the copolymer slurry was 38%, the dispersion effect and adhesion of the resulting hyperbranched aqueous dispersant were the best.
Further, based on the preparation steps of example 9, the single-factor deletion comparative experiment was performed on the copolymer slurry and the modified nano titanium dioxide, and the experimental results show that different factors are deleted, and the finally prepared hyperbranched aqueous dispersant has a certain difference in dispersion effect and adhesion, as shown in the following comparative examples.
Comparative example 1
Mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3:1 to form a nano titanium dioxide mixture, mixing the nano titanium dioxide mixture, a titanate coupling agent, absolute ethyl alcohol and deionized water in a mass ratio of 5:2:3:4, performing ultrasonic treatment on the obtained mixed solution, drying, washing with absolute ethyl alcohol after drying is completed, and naturally drying to obtain modified nano titanium dioxide; putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution with the mass fraction of 40%, stirring for 15min, filtering, adding acrylic acid, standing and soaking for 1.5h at the temperature of 50 ℃ to obtain a modified nano titanium dioxide solution; mixing the superfine inorganic powder and the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring the mixture for 20min at the rotating speed of 1000r/min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Comparative example 2
Adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry with the solid content of 34% for later use; pouring the copolymer slurry into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
Comparative example 3
Pouring the superfine inorganic powder into a stirring kettle, introducing 0.35MPa nitrogen for protection, and stirring at the rotating speed of 1000r/min for 20min to obtain mixed slurry; forming atomized liquid drops by the mixed slurry through an ultrasonic atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber; and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
The architectural decorative coatings of comparative examples 1 to 3 were applied to the same base material, and the sound absorption coefficient was measured according to the standard of GBJ88-1985 "Specification for measuring sound absorption coefficient and sound impedance ratio by standing wave tube method", and the results are shown in Table 2 below:
TABLE 2
As can be seen from Table 2, the viscosity and wall adhesion time of the paint carrier of the hyperbranched water-based dispersant prepared by the invention are greatly improved compared with the viscosity and wall adhesion time of the copolymer slurry and the modified nano titanium dioxide used alone.
In general, the styrene-maleic anhydride copolymer is fused with the superfine inorganic powder to prepare copolymer slurry, wherein the styrene has a benzene ring structure and has a good dispersing effect on phthalocyanine paint carriers, and the maleic anhydride is used as an anchoring group for dispersing the paint carriers and has an obvious dispersing effect, and the adhesive capacity and viscosity of the superfine inorganic powder are improved by utilizing the copolymerization reaction of the styrene-maleic anhydride copolymer and the superfine inorganic powder; meanwhile, the modified nano titanium dioxide is added, so that the dispersibility and weather resistance of the hyperbranched water-based dispersant are further improved, and the adhesion time of the water-based paint carrier and a wall body is greatly prolonged.
It should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a hyperbranched water-based dispersant is characterized by comprising the following steps:
1) adding the superfine inorganic powder into a styrene-maleic anhydride copolymer solution, and uniformly mixing to obtain copolymer slurry;
2) putting the modified nano titanium dioxide into a container, adding a sodium hydroxide solution into the container, stirring for 10-15 min, filtering, adding acrylic acid into the container, standing and soaking for 1-2 h at the temperature of 45-50 ℃ to obtain a modified nano titanium dioxide solution;
3) mixing the copolymer slurry with the modified nano titanium dioxide solution, pouring the mixture into a stirring kettle, introducing nitrogen for protection, and stirring for 20-25min to obtain mixed slurry;
4) forming atomized liquid drops by the mixed slurry through an atomizer, and drying and dehydrating the atomized liquid drops in a drying chamber;
5) and cooling the dried mixed slurry to room temperature, and then carrying out reduced pressure distillation to obtain the hyperbranched water-based dispersant.
2. The method for preparing the hyperbranched aqueous dispersant according to claim 1, wherein the solid content in the copolymer slurry in the step 1) is 30 to 38%.
3. The method for preparing the hyperbranched aqueous dispersant according to claim 1, wherein the mass fraction of the sodium hydroxide solution in the step 2) is 30 to 50%.
4. The method for preparing a hyperbranched aqueous dispersant according to claim 1, wherein the nitrogen pressure in the step 3) is 0.35 to 0.4 MPa.
5. The method for preparing the hyperbranched aqueous dispersant of claim 1, wherein the rotation speed of the stirring kettle in the step 3) is 800-1200 r/min.
6. The method for preparing the hyperbranched aqueous dispersant according to claim 1, wherein the atomizer in the step 4) is an ultrasonic atomizer.
7. The method for preparing the hyperbranched aqueous dispersant according to claim 1, wherein the method for preparing the modified nano titanium dioxide in the step 2) comprises the steps of: mixing the nano titanium dioxide mixture, the coupling agent, the absolute ethyl alcohol and the deionized water, carrying out ultrasonic treatment on the obtained mixed solution, drying, washing with the absolute ethyl alcohol after drying, and naturally drying to obtain the modified nano titanium dioxide.
8. The preparation method of the hyperbranched aqueous dispersant of claim 7, wherein the nano titanium dioxide mixture is prepared by mixing anatase titanium dioxide and rutile titanium dioxide in a mass ratio of 3 (1-5).
9. The preparation method of the hyperbranched aqueous dispersant of claim 7, wherein the mass ratio of the nano titanium dioxide mixture, the coupling agent, the anhydrous ethanol and the deionized water is 5:2:3: 4.
10. The method of claim 7, wherein the coupling agent is a titanate.
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