A high-atomization wall renovation water paint spray and its preparation method and application

Abstract

The invention relates to a high-atomization wall renovation water paint spray and a preparation method and application thereof. The wall renovation water paint spray composition comprises a homemade water-based acrylic emulsion, an organic modified polysiloxane dispersion MC-220, anatase nano titanium dioxide, heavy calcium powder of 2500-3000 meshes, a film former, a dispersant, a wetting agent, a defoamer, a corrosion inhibitor, a neutralizer, a thickener, an antifreeze agent, a preservative and mildewproof agent, water and a propellant. The water paint spray of the invention has good dispersibility, uniform emulsion without sedimentation, normal temperature construction, simple operation, and avoids uneven spraying, easy clogging of valve nozzles, leakage and the like during the construction process. The sprayed paint film dries quickly, is fine and smooth, has high whiteness, and has zero VOC and zero formaldehyde, has application effects such as waterproofing, oil proofing, and anti-graffiti, and has good photocatalytic effect, can purify air, sterilize, deodorize, and prevent mildew, and can be widely used in the field of building painting.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a high-atomization wall renovation water paint spray and a preparation method and application thereof. Background Art

[0002] Wall renovation agents, as a product that can quickly restore the wall to its new look, have gradually entered people's lives. Using wall renovation agents can quickly repair various walls, and even pursue a higher aesthetic effect. Walls can be renovated with latex paint, wallpaper or wall cloth, diatom mud, etc. Among them, latex paint is the most commonly used material for renovating walls, because in the decoration process, latex paint can be used on a large area, it is also very convenient to use, rich in color, and environmentally friendly, but there are relatively few patterns and styles that can be applied, and it is not resistant to scrubbing and is prone to scratches; wallpaper or wall cloth is very convenient to construct, and there are many patterns and styles, but because a lot of glue is needed to post wallpaper or wall cloth, and the glue contains some harmful substances, the environmental performance of the material is poor; diatom mud has the functions of wall self-cleaning, fire retardant, etc., the decoration effect is very beautiful, and the material is relatively environmentally friendly.

[0003] Among the existing wall renovation agents, self-spraying renovation paint is very popular among the public because of its convenience. It can be evenly sprayed on the part of the wall that needs to be renovated to cover it and restore it to a new wall. However, with the progress of the times, people's requirements for this product are getting higher and higher. The current self-spraying wall renovation agent products solve the convenience of the general public to use the product, and the construction is simple. However, the market has no strict regulations and standards for products in this regard, and the quality is uneven. Some products even use preservatives containing formaldehyde, and some products contain a large amount of powder, which leads to a large amount of bottoming after a long storage time. During construction, it is very easy to clog the nozzle, resulting in uneven spraying, poor atomization, and uneven and rough sprayed walls, which is very unsightly. CN112852230A discloses a spray paint containing pure acrylic emulsion, elastic emulsion, rutile titanium dioxide and other gravel, which has good waterproof properties, but the spray paint has a low sand content, and the paint film whiteness, glossiness, hiding power, feel, and smoothness are not reflected; CN107022262A discloses an aerosol type water-based wall repair paint (self-spraying water paint spray), which has excellent effects such as high stability, strong hiding power, and good construction performance, but the water paint contains a large amount of organic solvents, so it has high volatility after construction and produces a pungent odor. It is irritating for daily painting and is not safe and environmentally friendly.

[0004] To sum up, there is still a lot of room for development in the performance of current self-spraying wall renovation water paint and other products. Developing a green, environmentally friendly, safe, zero VOC, zero formaldehyde, zero irritation water paint spray with good construction performance will have good development and application prospects for daily wall renovation, covering oil stains, graffiti, etc. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a high-atomization wall renovation water paint spray and a preparation method and application thereof.

[0006] In the first aspect, the present invention provides a water-based paint for wall renovation, wherein the water-based paint composition includes water-based acrylic emulsion, titanium dioxide, film-forming agent, heavy calcium powder, dispersant, wetting agent, defoaming agent, corrosion inhibitor, neutralizer, thickener, organic modified siloxane, antifreeze agent, preservative and mildew inhibitor, and water.

[0007] Preferably, the wall renovation water paint of the present invention comprises, by weight, 200 to 280 parts by weight of water-based acrylic emulsion.

[0008] 30-60 parts of organic modified polysiloxane dispersion, 30-50 parts of anatase nano titanium dioxide, 400-500 parts of heavy calcium powder, 10-20 parts of film former, 2-3 parts of dispersant, 3-4 parts of wetting agent, 2-3 parts of defoamer, 1-3 parts of corrosion inhibitor, 1-3 parts of neutralizer, 2-8 parts of thickener, 50-80 parts of antifreeze agent, 0.5-1 parts of preservative and mildew inhibitor, 100-200 parts of water;

[0009] The water-based acrylic emulsion is synthesized from an acrylic hard monomer, an acrylic soft monomer and an acrylic functional monomer, wherein the acrylic hard monomer is methyl methacrylate, the acrylic soft monomer is butyl acrylate, the acrylic functional monomer is isobornyl methacrylate, and the mass ratio of the acrylic hard monomer, the acrylic soft monomer and the acrylic functional monomer is 1:1-5:1-5.

[0010] The film-forming agent is selected from one or more of benzyl alcohol, ethylene glycol butyl ether, propylene glycol phenyl ether, and dodecyl alcohol ester;

[0011] The dispersant is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, polycarboxylic acid ammonium salt, alkyl glycoside, alkylphenol polyoxyethylene ether, Span, and Tween;

[0012] The wetting agent is selected from one or more of BYK348, Digo 270, and HY408;

[0013] The defoaming agent is selected from one or more of SN6724, SN6725, SN1340, SN1311, GL-58, and Digo 902W;

[0014] The corrosion inhibitor is selected from one or more of triethanolamine, sodium benzoate, sodium nitrite, sodium tripolyphosphate, sodium dihydrogen phosphate, benzotriazole, and ATC701;

[0015] The neutralizing agent is selected from one or more of ethanolamine, AMP-95, and caustic soda;

[0016] The thickener is selected from one or more of PU 1190, M5, HPMC, and ASE-60;

[0017] The antifreeze agent is selected from one or more of ethylene glycol, propylene glycol, methanol and ethanol;

[0018] The antiseptic and mildew preventer is selected from one or more of KF-88, BIT 10 and rocima342.

[0019] The heavy calcium powder adopts 2500-3000 mesh ultra-fine ultra-white calcium carbonate;

[0020] The organic modified siloxane was purchased from Guangzhou Wangsan Technology Co., Ltd., model MC-220;

[0021] Furthermore, 0.1 to 1 parts by mass of fragrance can be added to the wall renovation water paint.

[0022] The water-based acrylic emulsion is homemade, and has the appearance of a milky white liquid with a slightly blue phase, a viscosity of 2000-7000 mPa.S, a solid content of 46wt%±1wt%, a pH value of 7-9, a glass transition temperature of 30°C, and a film-forming temperature of 22°C.

[0023] The preparation method of the homemade water-based acrylic emulsion is as follows:

[0024] S1, adding all acrylic monomers including acrylic hard monomer, acrylic soft monomer and acrylic functional monomer, part of emulsifier and part of water into a pre-emulsification kettle and emulsifying for 30-40 minutes to obtain an emulsion;

[0025] S2, adding the remaining water, part of the emulsifier, and the buffer into the polymerization reactor, then heating to 78-80° C., adding part of the emulsion prepared in step S1, and adding part of the initiator into the polymerization reactor for reaction;

[0026] S3, dropwise add the remaining emulsion prepared in step S1 into the polymerization reactor to react with the remaining initiator for 3-4 hours;

[0027] S4. Finally, the polymerization reactor is heated to 85-90°C and kept warm for a period of time, then cooled to 45-50°C, and the pH value of the reaction system is adjusted to 6-7 to obtain a water-based acrylic emulsion.

[0028] Furthermore, the aqueous acrylic emulsion is synthesized from an acrylic hard monomer, an acrylic soft monomer and an acrylic functional monomer, the acrylic hard monomer is methyl methacrylate, the acrylic soft monomer is butyl acrylate, the acrylic functional monomer is isobornyl methacrylate, and the mass ratio of the acrylic hard monomer, the acrylic soft monomer and the acrylic functional monomer is 1:1~5:1~5, preferably 1:1.5:1.5.

[0029] Furthermore, the emulsifier in the preparation process is selected from one or more of ZS27N, NP-10, and sodium dodecylbenzene sulfonate;

[0030] Furthermore, the buffer in the preparation process is selected from one or more of sodium carbonate, ammonia water, and triethanolamine;

[0031] Furthermore, the initiator in the preparation process is selected from one or more of sodium persulfate, potassium persulfate, and ammonium persulfate.

[0032] In a second aspect, the present invention provides a method for preparing a water-based paint for wall renovation, comprising the following steps:

[0033] S1. Add corrosion inhibitor and part of water into the reactor, turn on the agitator, rotate at 300-500 r / min, stir for 5-10 min to fully dissolve the corrosion inhibitor, and then turn off the agitator;

[0034] S2, mix titanium dioxide, dispersant, wetting agent, defoamer and water-based acrylic emulsion, turn on the mixer, adjust the speed to 600-800r / min, disperse and stir for 30-40min, then slowly add heavy calcium powder, and adjust the speed to 1000-1200r / min;

[0035] S3. Add a film-forming agent, an organic modified siloxane, an antifreeze agent, a preservative and a mildew preventer, and a thickener to step S2 in sequence, continue stirring for 20 to 30 minutes, adjust the viscosity of the slurry to 1000 to 1500 mPa.s with the remaining water, and then adjust the pH value of the slurry to between 7 and 9 with a neutralizer to obtain a water-based paint for wall renovation.

[0036] In a third aspect, the present invention also provides a highly atomized wall renovation water paint spray, wherein the water paint spray composition includes the wall renovation water paint and a propellant.

[0037] Further, the propellant is selected from one or more of dimethyl ether, deodorized coal gas, nitrogen or carbon dioxide;

[0038] Furthermore, the mass ratio of the wall renovation water paint and the propellant is (90-115): (55-105);

[0039] More preferably, the mass ratio of dimethyl ether to nitrogen is 50-115:0.5;

[0040] In a fourth aspect, the present invention also provides a method for preparing a highly atomized wall renovation water paint spray, comprising the following steps:

[0041] The wall renovation water paint is filtered through a 500-mesh gauze, and then the wall renovation water paint is pumped into a filling tank, glass beads are added, the valve is sealed, and the propellant is filled. After the inflation is completed, the pressure and air tightness are checked, and the finished product is obtained after the test spray is qualified.

[0042] Furthermore, the pressure resistance performance of the device for filling high-atomization wall renovation water paint spray is: air tightness 0.6~0.8MPa, no leakage; deformation pressure is 1.2~1.8MPa, no deformation; bursting pressure is 1.4~2.0MPa, no explosion.

[0043] The wall renovation water paint of the present invention adopts a homemade water-based acrylic emulsion, and the water-based acrylic emulsion with a specific structure is prepared by using acrylic hard monomers, acrylic soft monomers and acrylic functional monomers, and the compounding components and proportions of the acrylic hard monomers, acrylic soft monomers and acrylic functional monomers are adjusted to obtain an aqueous acrylic emulsion prepared by acrylic hard monomers (methyl methacrylate), acrylic soft monomers (butyl acrylate) and acrylic functional monomers (isobornyl methacrylate) in a mass ratio of 1:1-5:1-5. The aqueous acrylic emulsion has good stability, does not have emulsion separation at low temperatures, has excellent water resistance, is impermeable, and has a good waterproof effect. At the same time, the homemade water-based acrylic emulsion of the present invention has zero VOC, zero formaldehyde, is green and environmentally friendly, and can be widely used in daily wall renovation water paint (self-spraying type).

[0044] The organic modified siloxane used in the wall renovation water paint of the present invention is an organic modified polysiloxane dispersion MC-220. The siloxane is suitable for water-based systems and has good compatibility. Due to its unique chemical structure, a monomolecular layer with extremely high siloxane density can be formed on the surface of the paint film, thereby greatly improving the water resistance, acid and alkali resistance, smoothness, stain resistance, anti-graffiti and other properties of the paint film surface, improving the stability of the paint film, and the paint film is smooth, has a good feel and high gloss.

[0045] The titanium dioxide used in the wall renovation water paint of the present invention is anatase nano titanium dioxide. The appearance of the nano titanium dioxide used in the present invention is white loose powder. It is used in the wall renovation water paint so that the paint film has a good photocatalytic effect, can decompose harmful gases and some inorganic compounds in the air, and can inhibit the activity of bacterial growth and viruses, so that the paint film has multi-functional activities such as air purification, sterilization, deodorization, and mildew prevention. The anatase nano titanium dioxide with a particle size of 3 to 5 nm has a uniform particle size, a large specific surface area, good dispersibility, and excellent compatibility with other raw materials. It is easy to disperse in the wall renovation water paint of the present invention, and is not easy to sink to the bottom, can better improve the whiteness of the paint film, has strong covering power, and can improve the air purification, sterilization, deodorization, and mildew prevention effects of the wall renovation water paint film.

[0046] The heavy calcium powder used in the wall renovation water paint of the present invention is 2500-3000 mesh ultrafine ultrawhite calcium carbonate, which is mainly used in food, high-grade water-based paint, oil-based paint, plastic, wire and cable tire, and cosmetics industries, has high oil absorption, large addition amount, and has excellent reinforcement effect on rubber and coatings. In the wall renovation water paint of the present invention, the water paint emulsion spraying effect can be made more uniform, delicate and smooth, and is not easy to clog the valve nozzle, and the cost can be reduced at the same time.

[0047] Based on the above-mentioned wall renovation water paint / high atomization wall renovation water paint spray, a variety of high-performance raw materials are used to

[0048] In order to make the large amount of powder particles in the emulsion dispersed evenly without sedimentation, stratification and good stability,

[0049] By compounding water-based acrylic emulsion, organic modified polysiloxane dispersion, and auxiliary agents such as film-forming agent, dispersant, and wetting agent, uniform dispersion of anatase nano titanium dioxide and ultrafine ultra-white calcium carbonate in the emulsion is achieved. The obtained emulsion has high mixing and dispersion degree, no sedimentation, and excellent spray sprayability and construction performance.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] (1) The high-atomization wall renovation water paint spray of the present invention adopts a homemade water-based acrylic emulsion, which has high dispersion, high mixing uniformity, no sedimentation, no stratification, excellent stability, water resistance, alkali resistance, and excellent waterproof performance, and achieves zero VOC, no formaldehyde, and is green, safe and environmentally friendly.

[0052] (2) The high-atomization wall renovation water paint spray of the present invention adopts a self-contained pressure ultra-fine atomization nozzle to achieve high-atomization wall renovation water paint spray construction at room temperature. It is easy to operate, has a white spraying effect, a smooth feel, does not clog the valve nozzle, has fast drying, is waterproof, oil-proof, graffiti-proof and other excellent properties, and can be widely used in the field of building painting. DETAILED DESCRIPTION

[0053] The experimental methods in the following examples of the present invention without specifying specific conditions are usually carried out under conventional conditions or under conditions recommended by the manufacturers. The various commonly used chemical reagents used in the examples are all commercially available products.

[0054] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0055] The terms "including" and "having" and any variations thereof of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, device, product or equipment comprising a series of steps is not limited to the listed steps or modules, but may optionally include steps not listed, or may optionally include other steps inherent to these processes, methods, products or equipment.

[0056] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0057] The present invention is further described in the following examples, but the examples are not intended to limit the scope of protection of the present invention.

[0058] The sources and types of the reagents, raw materials and other components used in the examples of the present invention are specifically shown in Table 1;

[0059] Table 1 Sources and models of reagents and raw materials

[0060]

[0061] The preparation method of the aqueous acrylic emulsion of the present invention is as follows:

[0062] S1. Add 400g of all acrylic monomers including 100g of acrylic hard monomer (methyl methacrylate), 150g of acrylic soft monomer (butyl acrylate), 150g of acrylic functional monomer (isobornyl methacrylate), 150g of part of emulsifier (ZS27N), and 300g of part of water into a pre-emulsification kettle and emulsify for 35min to obtain a non-stratified emulsion;

[0063] S2, add 50g of remaining water, 70g of part of the emulsifier (ZS27N), and 5g of the buffer (triethanolamine) into the polymerization reactor, then heat it to 80°C, add 550g of part of the emulsion prepared in step S1, and add 15g of part of the initiator (potassium persulfate) into the polymerization reactor and react for 30min;

[0064] S3, dropwise add the remaining 300 g of the emulsion prepared in step S1 and the remaining 10 g of the initiator (potassium persulfate) into the polymerization reactor for reaction, and the reaction is completed within 4 hours;

[0065] S4. Finally, the polymerization reactor was heated to 85-90°C and kept warm for 2 hours, then cooled to 50°C, and a pH adjuster (0.1 mol / L hydrochloric acid or 0.1 mol / L NaOH) was added to adjust the pH value of the reaction system to 7 to obtain a homemade water-based acrylic emulsion.

[0066] The homemade water-based acrylic emulsions in the embodiments of the present invention all adopt the aforementioned homemade water-based acrylic emulsions.

[0067] Example 1 Preparation of water-based paint for wall renovation

[0068] The wall renovation water paint formula prepared in this embodiment is shown in Table 2;

[0069] Table 2: Wall renovation water paint formula

[0070]

[0071] According to the formula in Table 2, this embodiment Wall renovation water paint The specific preparation steps are as follows:

[0072] S1. Add corrosion inhibitor and 160g pure water into the reactor, turn on the stirrer, rotate at 300r / min, stir for 10min to fully dissolve the corrosion inhibitor, and then turn off the stirrer;

[0073] S2, titanium dioxide, dispersant, wetting agent, defoamer, and aqueous acrylic emulsion are mixed, the mixer is turned on, the speed is adjusted to 800 rpm, and the mixture is dispersed and stirred for 30 min, and then the heavy calcium powder is slowly added, and the speed is adjusted to 1000 r / min;

[0074] S3. Add film-forming agent, organic modified siloxane, antifreeze agent, fragrance, preservative and mildew preventer, and thickener to step S2 in sequence, continue stirring for 20 minutes, adjust the viscosity of the liquid to 1500mPa.s with the remaining 40g of pure water, and then add a neutralizer to adjust the pH of the liquid (about 7.5~8.0) to obtain wall renovation water paint.

[0075] This embodiment High atomization wall renovation water paint spray The specific preparation steps are as follows:

[0076] The prepared wall renovation water paint is filtered through a 500-mesh gauze, and poured into an aerosol can Ø65×158 (the nominal diameter of the can body is 65mm, and the nominal can height is 158mm) at a weight ratio of 300g±5g. Two glass beads are added to the filling can, and a valve is inserted to seal the can. Then, 60g±2g of propellant dimethyl ether and 0.5g±0.05g of nitrogen are filled. The pressure is controlled not to exceed 0.6MPa (25°C). The sealing performance and spray performance are checked, the button is installed, and the outer cover is covered to obtain a high-atomization wall renovation water paint spray.

[0077] Example 2 Preparation of water-based paint for wall renovation

[0078] The wall renovation water paint formula prepared in this embodiment is shown in Table 3;

[0079] Table 3: Wall renovation water paint formula

[0080]

[0081] According to the formula in Table 3, this embodiment Wall renovation water paint The specific preparation steps are as follows:

[0082] S1. Add 120 g of corrosion inhibitor and part of pure water into the reactor, turn on the agitator, rotate at 300 r / min, stir for 10 min to fully dissolve the corrosion inhibitor, and then turn off the agitator;

[0083] S2, titanium dioxide, dispersant, wetting agent, defoamer, and aqueous acrylic emulsion are mixed, the mixer is turned on, the speed is adjusted to 800r / min, and the dispersion is stirred for 30min, and then the heavy calcium powder is slowly added, and the speed is adjusted to 1000r / min;

[0084] S3. Add film-forming agent, organic modified siloxane, antifreeze agent, fragrance, preservative and mildew preventer, and thickener to step S2 in sequence, continue stirring for 20 minutes, adjust the viscosity of the liquid to 1500mPa.s with the remaining 30g of pure water, and then add a neutralizer to adjust the pH value of the liquid (about 8.0~8.5) to obtain wall renovation water paint.

[0085] This embodiment High atomization wall renovation water paint spray The specific preparation steps are as follows:

[0086] The prepared wall renovation water paint is filtered through a 500-mesh gauze, and poured into an aerosol can Ø65×195 (nominal can diameter is 65mm, nominal can height is 195mm) at a weight ratio of 380g±5g. Two glass beads are added, and a valve is inserted to seal the can. Then, 80g±2g of propellant dimethyl ether and 0.5g±0.05g of nitrogen are filled. The pressure is controlled not to exceed 0.6MPa (25°C). The sealing performance and spray performance are checked, the button is installed, and the outer cover is covered to obtain a highly atomized wall renovation water paint spray.

[0087] Example 3 Preparation of water-based paint for wall renovation

[0088] The wall renovation water paint formula prepared in this embodiment is shown in Table 4;

[0089] Table 4: Wall renovation water paint formula

[0090]

[0091] According to the formula in Table 4, this embodiment Wall renovation water paint The specific preparation steps are as follows:

[0092] S1. Add corrosion inhibitor and 120 g of water into the reactor, turn on the agitator, rotate at 300 r / min, stir for 10 min to fully dissolve the corrosion inhibitor, and then turn off the agitator;

[0093] S2, titanium dioxide, dispersant, wetting agent, defoamer, and aqueous acrylic emulsion are mixed, the mixer is turned on, the speed is adjusted to 800r / min, and the dispersion is stirred for 30min, and then the heavy calcium powder is slowly added, and the speed is adjusted to 1000r / min;

[0094] S3. Add film-forming agent, organic modified siloxane, antifreeze agent, flavor, preservative and mildew preventer, and thickener to step S2 in sequence, continue stirring for 20 minutes, adjust the viscosity of the slurry to 1500mPa.s with the remaining 40g of pure water, and then add a neutralizer to adjust the pH value of the slurry (about 8.5~9.0) to obtain wall renovation water paint.

[0095] This embodiment High atomization wall renovation water paint spray The specific preparation steps are as follows:

[0096] The prepared wall renovation water paint is filtered through a 500-mesh gauze, and poured into an aerosol can Ø65×240 (nominal can diameter is 65mm, nominal can height is 240mm) at a weight ratio of 430g±5g. Two glass beads are added, and a valve is inserted to seal the can. Then, 100g±2g of propellant dimethyl ether and 0.5g±0.05g of nitrogen are filled. The pressure is controlled not to exceed 0.6MPa (25°C). The sealing performance and spray performance are checked, the button is installed, and the outer cover is covered to obtain a highly atomized wall renovation water paint spray.

[0097] Example 4 Preparation of water-based paint for wall renovation

[0098] The wall renovation water paint formula prepared in this embodiment is shown in Table 5;

[0099] Table 5: Wall renovation water paint formula

[0100]

[0101] According to the formula in Table 5, this embodiment Wall renovation water paint The specific preparation steps are as follows:

[0102] S1. Add 80 g of corrosion inhibitor and part of pure water into the reactor, turn on the agitator, rotate at 300 r / min, stir for 10 min to fully dissolve the corrosion inhibitor, and then turn off the agitator;

[0103] S2, titanium dioxide, dispersant, wetting agent, defoamer, and aqueous acrylic emulsion are mixed, the mixer is turned on, the speed is adjusted to 800r / min, and the dispersion is stirred for 30min, and then the heavy calcium powder is slowly added, and the speed is adjusted to 1000r / min;

[0104] S3. Add film-forming agent, organic modified siloxane, antifreeze agent, flavor, preservative and mildew preventer, and thickener to step S2 in sequence, continue stirring for 20 minutes, adjust the viscosity of the liquid to 1500mPa.s with the remaining 20g of pure water, and then add a neutralizer to adjust the pH value of the liquid (about 8.0~8.5) to obtain water-based paint for wall renovation.

[0105] This embodiment High atomization wall renovation water paint spray The specific preparation steps are as follows:

[0106] The prepared wall renovation water paint is filtered through a 500-mesh gauze, poured into an aerosol can Ø65×240 (nominal can diameter is 65mm, nominal can height is 240mm) at a weight ratio of 430g±5g, added with 2 glass beads, put in a valve, seal it, and then fill with propellant dimethyl ether 100g±2g and nitrogen 0.5g±0.05g. The pressure shall not exceed (25℃) 0.6MPa, check the sealing performance and spray performance, install the button, and cover the outer cover to obtain a high-atomization wall renovation water paint spray.

[0107] Example 5 Preparation of water-based paint for wall renovation

[0108] The wall renovation water paint formula prepared in this embodiment is shown in Table 6;

[0109] Table 6: Wall renovation water paint formula

[0110]

[0111] According to the formula in Table 6, this embodiment Wall renovation water paint The specific preparation steps are as follows:

[0112] S1. Add 80 g of corrosion inhibitor and part of pure water into the reactor, turn on the agitator, rotate at 300 r / min, stir for 10 min to fully dissolve the corrosion inhibitor, and then turn off the agitator;

[0113] S2, titanium dioxide, dispersant, wetting agent, defoamer, and aqueous acrylic emulsion are mixed, the mixer is turned on, the speed is adjusted to 800r / min, and the dispersion is stirred for 30min, and then the heavy calcium powder is slowly added, and the speed is adjusted to 1000r / min;

[0114] S3. Add film-forming agent, organic modified siloxane, antifreeze agent, flavor, preservative and mildew preventer, and thickener to step S2 in sequence, continue stirring for 20 minutes, adjust the viscosity of the slurry to 1500mPa.s with the remaining 20g of pure water, and then add a neutralizer to adjust the pH value of the slurry (about 7.5~8.0) to obtain wall renovation water paint.

[0115] This embodiment High atomization wall renovation water paint spray The specific preparation steps are as follows:

[0116] The prepared wall renovation water paint is filtered through a 500-mesh gauze, and poured into an aerosol can Ø65×158 (nominal can body diameter is 65mm, nominal can height is 158mm) at a weight ratio of 300g±5g. Two glass beads are added, and a valve is inserted to seal the can. Then 60g±2g of propellant dimethyl ether and 0.5g±0.05g of nitrogen are filled. The pressure is controlled not to exceed (25°C) 0.6MPa. The sealing performance and spray performance are checked, the button is installed, and the outer cover is covered to obtain a highly atomized wall renovation water paint spray.

[0117] Example 6 Preparation of water-based paint for wall renovation

[0118] The wall renovation water paint formula prepared in this embodiment is shown in Table 7;

[0119] Table 7: Wall renovation water paint formula

[0120]

[0121] According to the formula in Table 7, this embodiment Wall renovation water paint The specific preparation steps are as follows:

[0122] S1. Add corrosion inhibitor and 80g of pure water into the reactor, turn on the agitator, rotate at 3000r / min, stir for 10min to fully dissolve the corrosion inhibitor, and then turn off the agitator;

[0123] S2, titanium dioxide, dispersant, wetting agent, defoamer, and aqueous acrylic emulsion are mixed, the mixer is turned on, the speed is adjusted to 800r / min, and the dispersion is stirred for 30min, and then the heavy calcium powder is slowly added, and the speed is adjusted to 10000r / min;

[0124] S3. Add film-forming agent, organic modified siloxane, antifreeze agent, flavor, preservative and mildew preventer, and thickener to step S2 in sequence, continue stirring for 20 minutes, adjust the viscosity of the liquid to 1500mPa.s with the remaining 20g of pure water, and then add a neutralizer to adjust the pH value of the liquid (about 8.0~8.5) to obtain wall renovation water paint.

[0125] This embodiment High atomization wall renovation water paint spray The specific preparation steps are as follows:

[0126] The prepared wall renovation water paint is filtered through a 500-mesh gauze, and poured into an aerosol can Ø65×158 (nominal can diameter is 65mm, nominal can height is 158mm) at a weight ratio of 260±5g, and two glass beads are added. A valve is inserted and sealed, and then filled with 75±2g of propellant dimethyl ether and 0.5±0.05g of nitrogen. The pressure is controlled not to exceed (25℃) 0.6MPa, and the sealing performance and spray performance are checked. The button is installed and the outer cover is covered to obtain a highly atomized wall renovation water paint spray.

[0127] Example 7 Preparation of water-based paint for wall renovation

[0128] The wall renovation water paint formula prepared in this embodiment is shown in Table 8;

[0129] Table 8: Wall renovation water paint formula

[0130]

[0131] According to the formula in Table 8, this embodiment Wall renovation water paint The specific preparation steps are as follows:

[0132] S1. Add 80 g of corrosion inhibitor and part of pure water into the reactor, turn on the agitator, rotate at 300 rpm, stir for 10 minutes to fully dissolve the corrosion inhibitor, and then turn off the agitator;

[0133] S2, titanium dioxide, dispersant, wetting agent, defoamer, and aqueous acrylic emulsion are mixed, the mixer is turned on, the speed is adjusted to 800 rpm, and the mixture is dispersed and stirred for 30 minutes, and then the heavy calcium powder is slowly added, and the speed is adjusted to 1000 rpm;

[0134] S3. Add film-forming agent, organic modified siloxane, antifreeze agent, flavor, preservative and mildew preventer, and thickener to step S2 in sequence, continue stirring for 20 minutes, adjust the viscosity of the liquid to 1500mPa.s with the remaining 20g of pure water, and then add a neutralizer to adjust the pH value of the liquid (about 7.0~7.5) to obtain water-based paint for wall renovation.

[0135] This embodiment High atomization wall renovation water paint spray The specific preparation steps are as follows:

[0136] The prepared wall renovation water paint is filtered through a 500-mesh gauze, and poured into an aerosol can Ø65×158 (nominal can diameter is 65mm, nominal can height is 158mm) at a weight ratio of 250g±5g. Two glass beads are added, and a valve is inserted to seal the can. Then, 80g±2g of propellant dimethyl ether and 0.5g±0.05g of nitrogen are filled. The pressure is controlled not to exceed (25°C) 0.6MPa. The sealing performance and spray performance are checked, and the button is installed. After the outer cover is closed, a high-atomization wall renovation water paint spray is obtained.

[0137] Test Example 1: Performance test of high atomization water paint spray for wall renovation

[0138] The performance test of the high atomization wall renovation water paint spray prepared in Examples 1 to 7 was carried out, and the specific test methods and test results are shown in Tables 9 and 10 respectively;

[0139] Table 9: Performance test method for high atomization wall renovation water paint spray

[0140]

[0141] Table 10: Performance test results of high atomization wall renovation water paint spray

[0142]

[0143] From the performance test results in Table 10, it can be seen that the 7 groups of high-atomization wall renovation water paints prepared by the present invention have stable spray states, surface drying time of about 1h, white contrast ratio of 0.9, good covering power, water resistance and impermeability, excellent waterproofness, good and stable appearance, zero VOC, zero formaldehyde, green and environmentally friendly, and good construction performance. Among them, the high-atomization wall renovation water paint spray prepared by Example 7 has better spraying effect, strong pressure, no bubbles or flying silk, fine atomization and smooth feel, meeting the product technical requirements.

[0144] Comparative Example 1

[0145] The difference from Example 7 is that the homemade water-based acrylic emulsion of the wall renovation water paint spray in this comparative example is replaced by styrene acrylic emulsion (purchased from Baolijia Company), and the rest of the formula and preparation method are the same.

[0146] Comparative Example 2

[0147] The difference from Example 7 is that the organic modified polysiloxane dispersion MC-220 of the wall renovation water paint spray in this comparative example is replaced by HX-1003W (purchased from Shenzhen Jipeng Silicon Fluoride Company);

[0148] Comparative Example 3

[0149] The difference from Example 7 is that the titanium dioxide in the wall renovation water paint spray of this comparative example is replaced by rutile titanium dioxide (particle size 2000 mesh), and the rest of the formula and preparation method are the same.

[0150] Comparative Example 4

[0151] The difference from Example 7 is that the 3000 mesh heavy calcium powder in the wall renovation water paint spray of this comparative example is replaced by 1500 mesh heavy calcium powder, and the rest of the formula and preparation method are the same.

[0152] Comparative Example 5

[0153] The difference from Example 7 is that the thickener in the wall renovation water paint spray of this comparative example does not include M5, but is supplemented with ASE-60, and the rest of the formula and preparation method are the same.

[0154] Comparative Example 6

[0155] The difference from Example 7 is that in this comparative example, the pH of the wall renovation water paint spray is about 9.5 by adjusting the amount of neutralizer added, and the rest of the formula and preparation method are the same.

[0156] Test Example 2: Performance test of water paint spray for wall renovation

[0157] The performance test of the wall renovation water paint spray of comparative examples 1 to 6 was carried out, and the specific test method was the same as that of experimental example 1. The test results are shown in Table 11;

[0158] Table 11: Performance test results of water paint spray

[0159]

[0160] Comparing the test results of the water paint spray performance of Examples 1 to 7 and Comparative Examples 1 to 6, the wall renovation water paint spray prepared in Examples 1 to 7 of the present invention has high atomization, better spraying effect and stable emulsion, while the water paint spray prepared in Comparative Examples 1 to 6 has poor comprehensiveness, among which Comparative Examples 1, 2, 5 and 6 all show partial gloss loss, discoloration or bubbling, wrinkling, shedding and other water- and alkali-intolerant conditions. It can be seen that the self-made water-based acrylic emulsion, organic modified polysiloxane dispersion MC-220, compounding auxiliary agent and pH exceeding the optimal range of 7 to 9 used in the present invention have a significant effect on the paint film performance. The water paint spray emulsion prepared in Comparative Examples 3 to 4 using rutile titanium dioxide (particle size 2000 mesh) and heavy calcium powder 1500 mesh has low compatibility and is prone to precipitation. The sedimentation leads to low spray atomization, poor spraying effect, insufficient covering power, and difficult pressure adjustment. It is easy to drip or clog the valve nozzle, and the construction performance is poor.

[0161] In order to make the description concise, the above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. In the absence of contradiction, those skilled in the art can combine and combine the different embodiments and features of the different embodiments described in this specification.

Claims

1. A water paint for wall renovation, characterized in that: The water paint composition comprises, by weight: 200-280 parts of waterborne acrylic emulsion, 30-60 parts of organic modified polysiloxane dispersion, 30-50 parts of anatase nano titanium dioxide, 400-500 parts of heavy calcium powder, 10-20 parts of film former, 2-3 parts of dispersant, 3-4 parts of wetting agent, 2-3 parts of defoamer, 1-3 parts of corrosion inhibitor, 1-3 parts of neutralizer, 2-8 parts of thickener, 50-80 parts of antifreeze agent, 0.5-1 part of anticorrosion and mildewproof agent, and 100-200 parts of water. The components are prepared in the pH range of 7-9 to obtain a wall renovation water paint. The organic modified siloxane is Guangzhou Wangsan MC-220; the particle size of the anatase nano titanium dioxide is 3-5 nm; the particle size of the heavy calcium powder is 2500-3000 mesh; the thickener is selected from M5; The aqueous acrylic emulsion is synthesized from an acrylic hard monomer, an acrylic soft monomer and an acrylic functional monomer. The preparation method of the aqueous acrylic emulsion is as follows: S1, adding acrylic hard monomer, acrylic soft monomer and acrylic functional monomer, part of emulsifier and part of water into a pre-emulsification kettle to emulsify to obtain an emulsion; S2, adding the remaining water, part of the emulsifier, and the buffer into the polymerization reactor, then heating to 78-80° C., adding part of the emulsion prepared in step S1, and adding part of the initiator into the polymerization reactor for reaction; S3, dropwise add the remaining emulsion prepared in step S1 into the polymerization reactor to react with the remaining initiator for 3-4 hours; S4, finally, the polymerization reactor is heated to 85-90°C and kept warm for a period of time, then cooled to 45-50°C, and the pH value of the reaction system is adjusted to 6-7 to obtain an aqueous acrylic emulsion; The acrylic hard monomer is methyl methacrylate, the acrylic soft monomer is butyl acrylate, the acrylic functional monomer is isobornyl methacrylate, and the mass ratio of the acrylic hard monomer, the acrylic soft monomer and the acrylic functional monomer is 1:1-5:1-5.

2. The wall renovation water paint according to claim 1, characterized in that: The film-forming agent is selected from one or more of benzyl alcohol, ethylene glycol butyl ether, propylene glycol phenyl ether, and dodecyl alcohol ester; the dispersant is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, sodium sulfate of fatty alcohol polyoxyethylene ether, polycarboxylic acid ammonium salt, alkyl glycoside, alkylphenol polyoxyethylene ether, Span, and Tween; the wetting agent is selected from one or more of BYK348, Digo 270, and HY408; the defoaming agent is selected from one or more of SN6724, SN6725, GL-58, and Digo 902W; the corrosion inhibitor is selected from one or more of triethanolamine, sodium benzoate, sodium nitrite, sodium tripolyphosphate, sodium dihydrogen phosphate, benzotriazole, and ATC701; the neutralizer is selected from one or more of ethanolamine, AMP-95, and caustic soda; the antifreeze agent is selected from one or more of ethylene glycol, propylene glycol, methanol, and ethanol; the preservative and mildew preventer is selected from one or more of KF-88, BIT10, and rocima342.

3. The wall renovation water paint according to claim 1, characterized in that: The viscosity of the wall renovation water paint is 1000~1500mPa.s.

4. The wall renovation water paint according to claim 1, characterized in that: The emulsifier is selected from one or more of ZS27N, NP-10, and sodium dodecylbenzene sulfonate; the buffer is selected from one or more of sodium carbonate, ammonia water, and triethanolamine; and the initiator is selected from one or more of sodium persulfate, potassium persulfate, and ammonium persulfate.

5. A method for preparing the wall renovation water paint according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Add corrosion inhibitor and part of water into the reactor, turn on the agitator, rotate at 300-500 r / min, stir for 5-10 min to fully dissolve the corrosion inhibitor, and stop stirring; S2, mix anatase nano titanium dioxide, dispersant, wetting agent, defoamer, and aqueous acrylic emulsion, start stirring, adjust the speed to 600-800 r / min, disperse and stir for 30-40 min, then slowly add heavy calcium powder, and adjust the speed to 1000-1200 r / min; S3, add film-forming agent, organic modified siloxane, antifreeze agent, antiseptic and mildew preventer, and thickener to step S2 in sequence, continue stirring for 20 to 30 minutes, add the remaining water, and then use a neutralizer to adjust the pH value of the liquid to between 7 and 9 to obtain a wall renovation water paint.

6. A highly atomized water paint spray for wall renovation, characterized in that: The spray comprises the wall renovation water paint according to any one of claims 1 to 4 and a propellant, wherein the propellant is selected from one or more of dimethyl ether, deodorized coal gas, nitrogen and carbon dioxide.

7. The high-atomization wall renovation water paint spray according to claim 6 is characterized in that: The mass ratio of the wall renovation water paint and the propellant is (90~115):(55~105).

8. A method for preparing the highly atomized wall renovation water paint spray according to claim 7, characterized in that: The wall renovation water paint is filtered, and then the wall renovation water paint is pumped into a filling tank, glass beads are added, the valve is sealed, and the propellant is filled. After the inflation is completed, the pressure and air tightness are checked, and a high-atomization wall renovation water paint spray is obtained after the test spray is qualified.

9. Use of the high-atomization wall renovation water paint spray according to any one of claims 6 or 7 in building painting.

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