Preparation method of super-weather-resistant exterior wall latex paint

Abstract

The invention discloses a preparation method of super-weather-resistant exterior wall latex paint in the technical field of latex paint. The method comprises the following steps: S1, preparing a basic solution; s2, introducing a functional auxiliary agent; s3, dispersing the coloring agent and the filler; s4, formula adjustment and performance optimization; s5, introducing an emulsion and a coalescing agent; s6, adjusting the pH value; the super-weather-resistant exterior wall latex paint disclosed by the invention has the beneficial effects that the preparation raw materials of the super-weather-resistant exterior wall latex paint disclosed by the invention comprise the deionized water, the hydroxyethyl cellulose, the functional additive, the coloring agent, the filler, the emulsion and the coalescing agent, and the various materials are gradually mixed, so that the latex paint has good uniformity, and compared with the traditional latex paint, the latex paint has the advantages that the preparation cost is reduced, and the environment friendliness is realized. The latex paint has better mechanical property, durability, adhesive force, film-forming property, glossiness and weather resistance.

Description

Technical Field

[0001] The invention relates to the technical field of latex paint, and in particular to a method for preparing super weather-resistant exterior wall latex paint. Background Art

[0002] Exterior wall latex paint is a kind of paint specially used for the exterior walls of buildings. Its main function is to decorate and protect the building surface, make the building appearance neat and beautiful, and extend its service life. It is mainly composed of resin emulsion (base material), colorant, filler (body pigment), additives, etc., and uses water as the medium. According to the different emulsions used, exterior wall latex paint can be divided into silicone acrylic latex paint, polyurethane acrylic latex paint, pure acrylic latex paint, acrylic latex paint, tertiary vinegar latex paint and vinegar acrylic latex paint. In addition, according to its function and use, it can also be divided into protective latex paint, energy-saving latex paint, thermal insulation latex paint, colorful latex paint, etc.

[0003] As an important material for modern building exterior wall decoration, the performance of exterior wall latex paint is directly related to the beauty and durability of the building. In recent years, with the rapid development of the construction industry and the improvement of people's requirements for living environment, the performance improvement of exterior wall latex paint has become a research hotspot.

[0004] However, the traditional exterior wall latex paint formula still has many shortcomings in practical applications, such as poor performance in mechanical properties, durability, adhesion, film forming, gloss and weather resistance. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for preparing a super weather-resistant exterior wall latex paint, which is achieved through the following technical solutions.

[0006] A method for preparing a super weather-resistant exterior wall latex paint, the method comprising the following steps:

[0007] S1, preparing a basic solution, starting a stirring kettle, adding water and hydroxyethyl cellulose into the stirring kettle and mixing to form a basic solution;

[0008] S2, introducing a functional additive, adding the functional additive to the base solution to prepare a functional additive mixed system;

[0009] S3, colorant and filler dispersion, adding the colorant and filler into the functional additive mixing system;

[0010] S4, formula adjustment and performance optimization, adding performance additives;

[0011] S5, introduction of emulsion and film-forming aid, adding emulsion as film-forming substance and adding film-forming aid;

[0012] S6, pH adjustment, adding acid-base regulator to adjust the pH value of latex paint;

[0013] S7, filtering and discharging, filtering the latex paint through a filter, and then discharging and storing in a sealed container.

[0014] Preferably, in step S1, the water is deionized water, the rotation speed of the stirring kettle is 300-500 rpm, deionized water is first added to the stirring kettle, and then hydroxyethyl cellulose is gradually added until a transparent and uniform basic solution is formed.

[0015] Preferably, in step S2, the functional additives include AMP-95 neutralizer, high-efficiency dispersant, wetting agent and defoaming agent, and various functional additives are added in sequence, and the next functional additive is added after the previous functional additive is stirred evenly.

[0016] Preferably, in step S3, the colorant and filler are rutile titanium dioxide and calcite, respectively, and the rutile titanium dioxide and calcite are added to the functional additive mixing system through a high-speed shear disperser at the same time. The speed of the high-speed shear disperser is 2000-3000rpm. After setting the speed of the stirring kettle to 2000-2200rpm, the colorant and filler are added and stirred for 30 minutes.

[0017] Preferably, in step S4, the performance additives include mildew inhibitors, bactericides, ethylene glycol, ultraviolet absorbers and light stabilizers. After the performance additives are added, a thickener is added to adjust the viscosity of the latex paint, and the speed of the stirring kettle is set to 300-500 rpm before adding the performance additives.

[0018] Preferably, in step S5, the emulsion is silicone-modified acrylate, and the film-forming aid is alcohol ester dodecahydrate.

[0019] Preferably, in step S6, the acid-base regulator is ammonia water or acetic acid, and the pH value of the latex paint after adjustment is 7.5-8.5.

[0020] Preferably, in step S7, the mesh size of the filter is 100.

[0021] The beneficial effect of the present invention is that the raw materials for preparing the super weather-resistant exterior wall latex paint disclosed in the present application include deionized water, hydroxyethyl cellulose, functional additives, colorants, fillers, emulsions and film-forming additives. Various materials are gradually mixed so that the latex paint has good uniformity. Compared with traditional latex paints, the latex paint has better mechanical properties, durability, adhesion, film-forming properties, glossiness and weather resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 : Flow chart of the method for preparing super weather-resistant exterior wall latex paint of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, a method for preparing super weather-resistant exterior wall latex paint comprises the following steps:

[0026] S1, preparing a basic solution, starting a stirring kettle, adding water and hydroxyethyl cellulose into the stirring kettle and mixing to form a basic solution;

[0027] S2, introducing a functional additive, adding the functional additive to the base solution to prepare a functional additive mixed system;

[0028] S3, colorant and filler dispersion, adding the colorant and filler into the functional additive mixing system;

[0029] S4, formula adjustment and performance optimization, adding performance additives;

[0030] S5, introduction of emulsion and film-forming aid, adding emulsion as film-forming substance and adding film-forming aid;

[0031] S6, pH adjustment, adding acid-base regulator to adjust the pH value of latex paint;

[0032] S7, filtering and discharging, filtering the latex paint through a filter, and then discharging and storing in a sealed container.

[0033] Furthermore, in step S1, the water is deionized water, the rotation speed of the stirring kettle is 300-500 rpm, and deionized water is first added to the stirring kettle, and then hydroxyethyl cellulose is gradually added until a transparent and uniform basic solution is formed.

[0034] The use of deionized water reduces the impact of impurities on the performance of latex paint, dissolving hydroxyethyl cellulose under low-speed (300-500rpm) stirring helps to form a stable and transparent solution base, providing a uniform environment for subsequent steps.

[0035] The benefit of making a base solution from deionized water and hydroxyethyl cellulose is that it can improve the cohesion, adhesion and film-forming properties of latex paint, thereby improving the mechanical properties and durability of latex paint; it can also enhance the corrosion resistance and weather resistance of latex paint, helping to extend the service life of latex paint.

[0036] Furthermore, in step S2, the functional additives include AMP-95 neutralizer, high-efficiency dispersant, wetting agent and defoaming agent, and various functional additives are added in sequence. After the previous functional additive is stirred evenly, the next functional additive is added.

[0037] Under low speed (300-500rpm) stirring, add AMP-95 neutralizer, high-efficiency dispersant, wetting agent and defoamer in sequence. After the previous functional additive is stirred evenly, add the next functional additive to prevent the formation of lumps and ensure the uniformity of the latex paint.

[0038] As a co-dispersant, AMP-95 can effectively prevent the colorant from re-aggregating and improve the dispersibility of the colorant, so that the latex paint can obtain better hiding power and tinting power; AMP-95 can also enhance the abrasion resistance, water resistance and glossiness of the latex paint.

[0039] High-efficiency dispersants reduce the viscosity of latex paint, making the dispersion more workable and improving production efficiency; high-efficiency dispersants can coat the surface of colorant particles to prevent the particles from re-aggregating, thereby increasing the stability of the dispersion; because high-efficiency dispersants can evenly disperse colorant particles, the colorant particles are better dispersed in the latex paint, thereby improving the tinting power of the latex paint; the use of dispersants can also improve the surface properties of the coating such as gloss, transparency and brightness.

[0040] Wetting agents can reduce the surface tension of latex paint, making it easier for latex paint to wet the surface of the substrate and improving the adhesion of latex paint on the substrate; wetting agents help latex paint to level better during the construction process, reduce defects such as brush marks, sagging, orange peel, and improve the decorative and protective properties of the coating; because wetting agents improve the wettability and adhesion between latex paint and the substrate, they can enhance the weather resistance and water resistance of latex paint and extend the service life of the substrate.

[0041] Defoaming agents can reduce the surface tension of latex paint, hinder the gas from gathering in latex paint to form bubbles and foam, thereby improving the leveling of latex paint, reducing the impact of bubbles and foam on the surface quality of the coating, reducing the holes, defects and uneven surfaces left by bubbles and foam in the coating, and improving the quality and consistency of the coating.

[0042] Furthermore, in step S3, the colorant and filler are rutile titanium dioxide and calcite respectively, and the rutile titanium dioxide and calcite are added to the functional additive mixing system through a high-speed shear disperser at the same time. The speed of the high-speed shear disperser is 2000-3000rpm. After setting the speed of the stirring kettle to 2000-2200rpm, the colorant and filler are added and stirred for 30 minutes.

[0043] Rutile titanium dioxide and calcite are slowly added into the functional additive mixing system through a high-speed shear disperser to ensure that the colorant and filler are evenly dispersed to a predetermined fineness, and the diameter of the colorant and filler is less than 20 μm.

[0044] Rutile titanium dioxide can effectively cover the color and defects of the substrate; rutile titanium dioxide has good weather resistance and stability, can resist the erosion of ultraviolet rays, acids and alkalis and other environmental factors, and maintain the long-term color brightness and physical properties of the coating; the crystal structure of rutile titanium dioxide gives it excellent gloss, which can enhance the overall visual effect of the coating and make the coating surface smoother and brighter.

[0045] Calcite can improve the strength, hardness, wear resistance and other physical properties of latex paint, making the coating more durable; Calcite has good gloss properties, which can improve the appearance quality of the coating and make the coating surface smoother and brighter; Calcite, as a natural mineral resource, is relatively cheap and widely available. Adding an appropriate amount of calcite to latex paint can reduce production costs and improve the cost-effectiveness of latex paint; Calcite, as an inorganic filler, is non-toxic, harmless and has good biodegradability. Adding calcite to latex paint can reduce the use of organic solvents and reduce the VOC emissions of latex paint, thereby enhancing the environmental performance of latex paint.

[0046] Furthermore, in step S4, the performance enhancers include mildew inhibitors, bactericides, ethylene glycol, ultraviolet absorbers and light stabilizers. After the performance enhancers are added, thickeners are added to adjust the viscosity of the latex paint, and the speed of the stirring kettle is set to 300-500 rpm before adding the performance enhancers.

[0047] The selection of mildew inhibitors and bactericides is based on their broad-spectrum antibacterial properties and long-lasting effectiveness, so as to effectively prevent latex paint from being contaminated by microorganisms during storage and construction. Ethylene glycol, as a solvent, can dissolve or disperse the film-forming aids and film-forming aids in latex paint into a uniform liquid state to facilitate film formation during construction. After the construction is completed, ethylene glycol can evaporate from the paint film into the atmosphere. Ultraviolet absorbers and light stabilizers are added to further enhance the latex paint's anti-ultraviolet ability and long-term stability.

[0048] Furthermore, in step S5, the emulsion is silicone-modified acrylate, and the film-forming aid is alcohol ester dodecahydrate.

[0049] The selection of silicone-modified acrylate emulsions is based on their specific glass transition temperature (Tg) and weather resistance indicators. Silicone-modified acrylate emulsions contain a specific proportion of silicone monomers, which are embedded in the acrylate chain through copolymerization, thereby significantly improving the weather resistance and UV resistance of latex paints.

[0050] When alcohol ester 12 is used as a film-forming aid, it can reduce the minimum film-forming temperature (MFT) of latex paint due to its strong coalescence ability. This means that latex paint can form a better film at a lower ambient temperature, thereby expanding the application range of latex paint; alcohol ester 12 can also improve film-forming properties, improve the leveling and anti-hanging properties of latex paint, and enhance the mechanical strength of latex paint.

[0051] Furthermore, in step S6, the acid-base regulator is ammonia water or acetic acid, and the pH value of the latex paint after adjustment is 7.5-8.5.

[0052] Furthermore, in step S7, the mesh size of the filter is 100.

[0053] Filter the evenly mixed latex paint through a high-precision filter (such as a 100-mesh filter) to remove possible impurities and particulate matter and increase the fineness of the latex paint.

[0054] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a super weather-resistant exterior wall latex paint, characterized in that: The method comprises the following steps: S1, preparing a basic solution, starting a stirring kettle, adding water and hydroxyethyl cellulose into the stirring kettle and mixing to form a basic solution; S2, introducing a functional additive, adding the functional additive to the base solution to prepare a functional additive mixed system; S3, colorant and filler dispersion, adding the colorant and filler into the functional additive mixing system; S4, formula adjustment and performance optimization, adding performance additives; S5, introduction of emulsion and film-forming aid, adding emulsion as film-forming substance and adding film-forming aid; S6, pH adjustment, adding acid-base regulator to adjust the pH value of latex paint; S7, filtering and discharging, filtering the latex paint through a filter, and then discharging and storing in a sealed container.

2. The method for preparing the super weather-resistant exterior wall latex paint according to claim 1, characterized in that: In step S1, the water is deionized water, the rotation speed of the stirring kettle is 300-500 rpm, deionized water is first added to the stirring kettle, and then hydroxyethyl cellulose is gradually added until a transparent and uniform basic solution is formed.

3. The method for preparing the super weather-resistant exterior wall latex paint according to claim 1, characterized in that: In step S2, the functional additives include AMP-95 neutralizer, high-efficiency dispersant, wetting agent and defoaming agent. Various functional additives are added in sequence. After the previous functional additive is stirred evenly, the next functional additive is added.

4. The method for preparing the super weather-resistant exterior wall latex paint according to claim 1, characterized in that: In step S3, the colorant and filler are rutile titanium dioxide and calcite respectively. Rutile titanium dioxide and calcite are added to the functional additive mixing system through a high-speed shear disperser at the same time. The speed of the high-speed shear disperser is 2000-3000rpm. After setting the speed of the stirring kettle to 2000-2200rpm, the colorant and filler are added and stirred for 30 minutes.

5. The method for preparing the super weather-resistant exterior wall latex paint according to claim 1, characterized in that: In step S4, the performance additives include mildew inhibitors, bactericides, ethylene glycol, ultraviolet absorbers and light stabilizers. After the performance additives are added, a thickener is added to adjust the viscosity of the latex paint. After the speed of the stirring kettle is set to 300-500 rpm, the performance additives are added.

6. The method for preparing the super weather-resistant exterior wall latex paint according to claim 1, characterized in that: In step S5, the emulsion is silicone-modified acrylate, and the film-forming aid is alcohol ester dodecahydrate.

7. The method for preparing the super weather-resistant exterior wall latex paint according to claim 1, characterized in that: In step S6, the acid-base regulator is ammonia water or acetic acid, and the pH value of the latex paint after adjustment is 7.5-8.

5.

8. The method for preparing the super weather-resistant exterior wall latex paint according to claim 1, characterized in that: In step S7, the mesh size of the filter is 100.

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