A wall curing agent with formaldehyde-reducing effect and its preparation method

Abstract

This invention belongs to the field of water-based coating technology, specifically relating to a wall curing agent with formaldehyde-reducing properties and its preparation method. The wall curing agent provided by this invention comprises the following components: 60-70 parts modified acrylic resin emulsion, 20-25 parts deionized water, 3-5 parts propylene glycol ethyl ether acetate, 2-3 parts adipic acid dihydrazide, 1-2 parts dispersant, 6-10 parts sodium hydroxide, 0.8-1.2 parts defoamer, 0.5-1.2 parts nano titanium dioxide, 0.6-1 part silane coupling agent, and 0.5-1 part mildew inhibitor. The wall curing agent with formaldehyde-reducing properties provided by this invention does not require the use of film-forming aids or harmful substances such as formaldehyde. It self-dries at room temperature to form a tough and durable protective film with excellent anti-aging properties and weather resistance. It not only possesses good physical properties but also significantly improves the safety and durability of building structures.

Description

Technical Field

[0001] This invention belongs to the field of water-based coating technology, specifically relating to a wall curing agent with formaldehyde-reducing effect and its preparation method. Background Technology

[0002] Wall hardener is an environmentally friendly, water-based interface treatment material specifically designed to improve the quality of wall surfaces. It has the ability to deeply penetrate the wall substrate and, through crosslinking, makes the wall substrate structure denser and more stable. This treatment not only significantly improves the adhesion between subsequent coatings or decorative layers and the wall surface but also effectively increases the smoothness of the wall surface while reducing the possibility of moisture penetration. In short, wall hardener enhances the overall performance of the wall, providing a more solid and smooth base for subsequent construction, while also enhancing the wall's waterproofing capabilities. This material is particularly suitable for use before plastering, painting, wallpapering, or applying other decorative layers to ensure optimal workmanship and a long service life.

[0003] Acrylic resin is a copolymer of acrylate or methacrylate and other vinyl monomers. By changing parameters such as the resin synthesis process, monomer composition, glass transition temperature (Tg), number-average molecular weight (Mn) of the synthesized resin, and hydroxyl value of the resin, resins with excellent mechanical properties, bonding strength, film-forming properties, weather resistance, and rheological properties can be obtained. It has been widely used in many technical fields such as coatings, adhesives, latex, and paints. Therefore, water-based acrylic resin is very suitable as the main raw material for wall curing agents.

[0004] However, waterborne acrylic resins sometimes have significant drawbacks. Firstly, the drying process is problematic. Due to the high heat of evaporation of water, waterborne amino paints require either high-temperature baking or prolonged low-temperature baking, resulting in high energy consumption. Secondly, regarding performance, because water is used as the dispersion medium, residual waterborne additives after curing can lead to suboptimal water resistance in the coating. High water tension can cause surface defects such as pinholes and poor leveling, resulting in poor adhesion and reduced corrosion resistance.

[0005] Therefore, it is necessary to develop a wall curing agent with water-based acrylic resin as the main raw material, which has excellent weather resistance and corrosion resistance, and high penetration. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the purpose of this invention is to provide a wall curing agent with formaldehyde-reducing effect and its preparation method.

[0007] The technical solution of this invention is:

[0008] A wall hardener with formaldehyde-reducing properties comprises the following components in parts by weight:

[0009] The mixture contains 60-70 parts modified acrylic resin emulsion, 20-25 parts deionized water, 3-5 parts propylene glycol ethyl ether acetate, 2-3 parts adipic acid dihydrazide, 1-2 parts dispersant, 6-10 parts sodium hydroxide, 0.8-1.2 parts defoamer, 0.5-1.2 parts nano titanium dioxide, 0.6-1 part silane coupling agent, and 0.5-1 part mildew inhibitor.

[0010] Furthermore, the wall hardener with formaldehyde-reducing effect is composed of the following components in parts by weight:

[0011] The mixture contains 65 parts modified acrylic resin, 23 parts deionized water, 4 parts propylene glycol ethyl ether acetate, 2-3 parts adipic acid dihydrazide, 2 parts dispersant, 8 parts sodium hydroxide, 1 part defoamer, 1.0 part nano titanium dioxide, 0.8 parts silane coupling agent, and 0.7 parts mildew inhibitor.

[0012] Furthermore, the modified acrylic resin emulsion comprises the following raw materials in parts by weight:

[0013] The mixture contains 30-40 parts of a composite functional monomer, 35-45 parts of deionized water, 2-4 parts of an emulsifier, and 0.3-0.8 parts of an initiator.

[0014] Furthermore, the modified acrylic resin emulsion is prepared from the following raw materials in parts by weight:

[0015] The mixture contains 35 parts of a composite functional monomer, 40 parts of deionized water, 3 parts of emulsifier, and 0.6 parts of initiator.

[0016] Furthermore, the composite functional monomer is composed of methyl methacrylate, isooctyl acrylate, cyclohexyl methacrylate, styrene, and dodecafluoroheptyl methacrylate in a weight ratio of 9-11:6-8:5-9:1-2:3-4, preferably 10:7:6:2:3.5.

[0017] Furthermore, the emulsifier is composed of sodium dodecylbenzenesulfonate and dodecylphenol polyoxyethylene ether in a weight ratio of 2 to 3:1, preferably 2.5:1.

[0018] Furthermore, the initiator is ammonium persulfate.

[0019] Furthermore, the preparation method of the modified acrylic resin emulsion includes the following steps:

[0020] S1. Add emulsifier and deionized water to the reaction vessel, stir evenly, heat to 80-85℃, and purge the reaction vessel with nitrogen to remove oxygen. Then add composite functional monomers and disperse at 5000-6000 rpm for 30-40 minutes to obtain emulsion.

[0021] S2. Take 1 / 10 of the emulsion obtained in step S1 and add it to the reaction vessel. Then add 1 / 3 of the initiator. Keep the reaction at 85-90℃ for 10-15 minutes. Then add the remaining emulsion and initiator obtained in step S1 dropwise to the reaction vessel, controlling the dropwise addition time to 2-3 hours. Then continue to keep the reaction at 85-90℃ for 30-40 minutes, and then cool down to obtain the final product.

[0022] Furthermore, the dispersant is composed of hydroxyethyl cellulose, pentaerythritol and nonylphenol polyoxyethylene (4) ether ammonium sulfate in a weight ratio of 3 to 5:1 to 3:1, preferably 4:2:1.

[0023] Furthermore, the CAS number of the nonylphenol polyoxyethylene (4) ether ammonium sulfate is 9051-57-4.

[0024] Furthermore, the silane coupling agent is one of vinyltriethoxysilane, perfluorooctyltrichlorosilane, and γ-aminopropyltriethoxysilane.

[0025] Furthermore, the defoamer is a polysiloxane-polyether copolymer.

[0026] Furthermore, the defoamer is one of TEGO Foamex 825 and TEGO Foamex 1488, preferably TEGO Foamex 825.

[0027] Furthermore, the antifungal agent is isothiazolinone.

[0028] Furthermore, the particle size of the nano-titanium dioxide is 5–10 nm.

[0029] In addition, the present invention also provides a method for preparing the wall curing agent with formaldehyde-reducing effect, comprising the following preparation steps:

[0030] Step (1): Add half of the deionized water to the reactor, then add the dispersant and sodium hydroxide / defoamer while stirring, stir evenly, then add nano titanium dioxide, and stir evenly at 6000-7000 rpm to obtain a water slurry.

[0031] Step (2): Add propylene glycol ethyl ether acetate to the water slurry obtained in step (1) and stir until homogeneous. Then, gradually add modified acrylic resin emulsion at a speed of 200-300 rpm for 1-2 hours. Then, add silane coupling agent and adipic acid dihydrazide and stir until homogeneous at a speed of 4000-5000 rpm. Finally, add antifungal agent, stir, and pass through a 300-mesh sieve to obtain the final product.

[0032] The wall curing agent provided by this invention uses a modified polyacrylic acid resin emulsion prepared by a special process as the main raw material. This modified acrylic resin emulsion, prepared using the process of this invention, serves as the main film-forming substance, providing a tough and durable protective film with excellent anti-aging properties and microbial resistance. The composition incorporates nano-titanium dioxide, silane coupling agents, and adipic acid dihydrazide, among other components, with optimized formulation design to achieve low viscosity, high permeability, and self-drying function. This eliminates the need for film-forming aids and harmful substances such as formaldehyde. It self-dries at room temperature to form a tough and durable protective film. Furthermore, it excels at fully penetrating into the wall substrate material, making the substrate more compact through chemical bonding, thereby significantly improving the adhesion strength between mortar or putty and the wall surface, effectively preventing hollowing. It can deeply penetrate the surface of the wall substrate, using crosslinking to make the substrate material structure more dense, not only greatly improving the adhesion of the wall surface but also increasing smoothness and reducing water permeability. This dual reinforcement mechanism ensures a strong bond between the coating and the substrate, reduces the possibility of moisture intrusion, and further improves the overall performance and durability of the wall.

[0033] Meanwhile, the resulting wall hardener has a viscosity of 40-80 kDa and a long open time, ensuring it maintains its fluidity and penetrability for an extended period, reaching deep into the substrate. It is particularly suitable for porous materials such as cement floors, enhancing their structural strength and improving surface quality. During construction, it can be mixed with cement in any proportion, not only increasing the cement's strength but also improving its fluidity, making construction more convenient and yielding better results.

[0034] Furthermore, the dispersant of specific components provided by the present invention, by combining different types of additives, can obtain a multifunctional dispersant system that can not only adjust the rheology of the system, but also enhance the dispersion effect of the system, and enhance the long-term stability of the wall curing agent, reduce the risk of sedimentation, and effectively improve the coating quality, which helps to improve the adhesion and smoothness of the coating, improve the penetration performance, and thus improve the overall weather resistance of the coating.

[0035] Compared with existing technologies, the wall curing agent with formaldehyde-reducing effect and its preparation method provided by the present invention have the following advantages:

[0036] The wall curing agent with formaldehyde-reducing effect provided by this invention selects modified acrylic polymer as the main film-forming substance and combines it with components such as nano-titanium dioxide, silane coupling agent and adipic acid dihydrazide. The optimized formula design allows the components to work synergistically to achieve low viscosity, high permeability and self-drying function, thus eliminating the need for film-forming aids and harmful substances such as formaldehyde. It forms a tough and durable protective film under room temperature conditions, with excellent anti-aging properties and weather resistance. It not only has good physical properties, but also significantly improves the safety and durability of building structures. It is very suitable for use in building projects that require efficient reinforcement and protection, meeting the requirements of high permeability, providing a strong reinforcement effect, and maintaining environmental protection and safety. Detailed Implementation

[0037] The present invention will be further described below through specific embodiments, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not depart from the basic idea of ​​the present invention, they are all within the protection scope of the present invention.

[0038] Unless otherwise specified, the reagents used in the following examples and comparative examples are conventional reagents, which can be purchased from conventional reagent manufacturers and distributors. Unless otherwise specified, the methods used are existing technologies.

[0039] Example 1

[0040] A wall hardener with formaldehyde-reducing properties is composed of the following components in parts by weight:

[0041] The mixture consists of 60 parts modified acrylic resin emulsion, 20 parts deionized water, 3 parts propylene glycol ethyl ether acetate, 2 parts adipic acid dihydrazide, 1 part dispersant, 6 parts sodium hydroxide, 0.8 parts TEGO Foamex 825, 0.5 parts nano titanium dioxide (particle size 5-10 nm), 0.6 parts vinyltriethoxysilane, and 0.5 parts isothiazolinone.

[0042] The dispersant is composed of hydroxyethyl cellulose, pentaerythritol and nonylphenol polyoxyethylene (4) ether ammonium sulfate in a weight ratio of 3:1:1.

[0043] The modified acrylic resin emulsion is prepared from the following raw materials in parts by weight:

[0044] 30 parts of composite functional monomer, 35 parts of deionized water, 2 parts of emulsifier, and 0.3 parts of ammonium persulfate.

[0045] The composite functional monomer is composed of methyl methacrylate isooctyl acrylate, cyclohexyl methacrylate, styrene, and dodecafluoroheptyl methacrylate in a weight ratio of 9:8:9:2:4.

[0046] The emulsifier is composed of sodium dodecylbenzenesulfonate and dodecylphenol polyoxyethylene ether in a weight ratio of 2:1.

[0047] The preparation method of the modified acrylic resin emulsion includes the following steps:

[0048] S1. Add emulsifier and deionized water to the reaction vessel, stir evenly, heat to 80°C, and purge the reaction vessel with nitrogen to remove oxygen. Then add composite functional monomers and disperse at 5000 rpm for 30 minutes to obtain emulsion.

[0049] S2. Take 1 / 10 of the emulsion obtained in step S1 and add it to the reaction vessel. Then add 1 / 3 of the ammonium persulfate. Keep the reaction at 85°C for 10 minutes. Then add the remaining emulsion and ammonium persulfate obtained in step S1 dropwise to the reaction vessel. Control the dropwise addition time to 2 hours. Then continue to keep the reaction at 85°C for 40 minutes. Cool down to obtain the final product.

[0050] The preparation method of the wall curing agent with formaldehyde-reducing effect includes the following preparation steps:

[0051] Step (1): Add half of the deionized water to the reactor, then add the dispersant, sodium hydroxide and TEGO Foamex 825 while stirring, stir evenly, then add nano titanium dioxide and stir evenly at 6000 rpm to obtain a water slurry.

[0052] Step (2): Add propylene glycol ethyl ether acetate to the water slurry obtained in step (1) and stir until homogeneous. Then, gradually add modified acrylic resin emulsion at a speed of 200 rpm for 1 hour. Then, add vinyltriethoxysilane, perfluorooctyltrichlorosilane, γ-aminopropyltriethoxysilane and adipic acid dihydrazide and stir until homogeneous at a speed of 4000 rpm. Finally, add isothiazolinone, stir, and pass through a 300-mesh sieve to obtain the final product.

[0053] Example 2

[0054] A wall hardener with formaldehyde-reducing properties is composed of the following components in parts by weight:

[0055] The mixture contains 65 parts modified acrylic resin, 23 parts deionized water, 4 parts propylene glycol ethyl ether acetate, 2.5 parts adipic acid dihydrazide, 2 parts dispersant, 8 parts sodium hydroxide, 1 part TEGO Foamex 825, 1 part nano titanium dioxide, 0.8 parts perfluorooctyltrichlorosilane, and 0.7 parts isothiazolinone.

[0056] The dispersant is composed of hydroxyethyl cellulose, pentaerythritol and nonylphenol polyoxyethylene (4) ether ammonium sulfate in a weight ratio of 4:2:1.

[0057] The modified acrylic resin emulsion is prepared from the following raw materials in parts by weight:

[0058] 35 parts of composite functional monomer, 40 parts of deionized water, 3 parts of emulsifier, and 0.6 parts of ammonium persulfate.

[0059] The composite functional monomer is composed of methyl methacrylate, isooctyl acrylate, cyclohexyl methacrylate, styrene, and dodecafluoroheptyl methacrylate in a weight ratio of 10:7:6:2:3.5.

[0060] The emulsifier is composed of sodium dodecylbenzenesulfonate and dodecylphenol polyoxyethylene ether in a weight ratio of 2.5:1.

[0061] The preparation method of the modified acrylic resin emulsion includes the following steps:

[0062] S1. Add emulsifier and deionized water to the reaction vessel, stir evenly, heat to 83°C, and purge the reaction vessel with nitrogen to remove oxygen. Then add composite functional monomers and disperse at 5500 rpm for 35 min to obtain emulsion.

[0063] S2. Take 1 / 10 of the emulsion obtained in step S1 and add it to the reaction vessel. Then add 1 / 3 of the ammonium persulfate. Keep the reaction at 87°C for 12 minutes. Then add the remaining emulsion and ammonium persulfate obtained in step S1 dropwise to the reaction vessel, controlling the dropwise addition time to 2.5 hours. Then continue to keep the reaction at 87°C for 35 minutes, and then cool down to obtain the final product.

[0064] The preparation method of the wall curing agent with formaldehyde-reducing effect includes the following preparation steps:

[0065] Step (1): Add half of the deionized water to the reactor, then add the dispersant, sodium hydroxide and TEGO Foamex 825 while stirring. Stir until uniform, then add nano titanium dioxide and stir until uniform at 6000-7000 rpm to obtain a water slurry.

[0066] Step (2): Add propylene glycol ethyl ether acetate to the water slurry obtained in step (1) and stir until homogeneous. Then, gradually add modified acrylic resin emulsion at a speed of 250 rpm for 1.5 h. Then add perfluorooctyl trichlorosilane and adipic acid dihydrazide and stir until homogeneous at a speed of 4500 rpm. Finally, add isothiazolinone, stir, and pass through a 300-mesh sieve to obtain the final product.

[0067] Example 3

[0068] A wall hardener with formaldehyde-reducing properties is composed of the following components in parts by weight:

[0069] 70 parts modified acrylic resin emulsion, 25 parts deionized water, 5 parts propylene glycol ethyl ether acetate, 3 parts adipic acid dihydrazide, 2 parts dispersant, 10 parts sodium hydroxide, 1.2 parts TEGO Foamex 1488, 1.2 parts nano titanium dioxide (particle size 5-10 nm), 1 part γ-aminopropyltriethoxysilane, and 1 part isothiazolinone.

[0070] The dispersant is composed of hydroxyethyl cellulose, pentaerythritol and nonylphenol polyoxyethylene (4) ether ammonium sulfate in a weight ratio of 5:3:1.

[0071] The modified acrylic resin emulsion is prepared from the following raw materials in parts by weight:

[0072] 40 parts of composite functional monomer, 45 parts of deionized water, 4 parts of emulsifier, and 0.8 parts of ammonium persulfate.

[0073] The composite functional monomer is composed of methyl methacrylate isooctyl acrylate, cyclohexyl methacrylate, styrene, and dodecafluoroheptyl methacrylate in a weight ratio of 11:6:5:1:3.

[0074] The emulsifier is composed of sodium dodecylbenzenesulfonate and dodecylphenol polyoxyethylene ether in a weight ratio of 3:1.

[0075] The preparation method of the modified acrylic resin emulsion includes the following steps:

[0076] S1. Add emulsifier and deionized water to the reaction vessel, stir evenly, heat to 85°C, and purge the reaction vessel with nitrogen to remove oxygen. Then add composite functional monomers and disperse at 6000 rpm for 40 min to obtain emulsion.

[0077] S2. Take 1 / 10 of the emulsion obtained in step S1 and add it to the reaction vessel. Then add 1 / 3 of the ammonium persulfate. Keep the reaction at 90°C for 15 minutes. Then add the remaining emulsion and ammonium persulfate obtained in step S1 dropwise to the reaction vessel, controlling the dropwise addition time to 3 hours. Then continue to keep the reaction at 90°C for 30 minutes, and then cool down to obtain the final product.

[0078] The preparation method of the wall curing agent with formaldehyde-reducing effect includes the following preparation steps:

[0079] Step (1): Add half of the deionized water to the reactor, then add the dispersant, sodium hydroxide and TEGO Foamex 1488 while stirring, stir evenly, then add nano titanium dioxide and stir evenly at 7000 rpm to obtain a water slurry.

[0080] Step (2): Add propylene glycol ethyl ether acetate to the water slurry obtained in step (1) and stir until homogeneous. Then, gradually add modified acrylic resin emulsion at a speed of 300 rpm for 2 hours. Then, add γ-aminopropyltriethoxysilane and adipic acid dihydrazide and stir until homogeneous at a speed of 5000 rpm. Finally, add isothiazolinone, stir, and pass through a 300-mesh sieve to obtain the final product.

[0081] Comparative Example 1

[0082] Compared to Example 2, the difference lies in that dodecafluoroheptyl methacrylate in the composite functional monomer of the modified acrylic resin emulsion is replaced with hexafluorobutyl acrylate. That is, the composite functional monomer is composed of methyl methacrylate, isooctyl acrylate, cyclohexyl methacrylate, styrene, and hexafluorobutyl acrylate in a weight ratio of 10:7:6:2:3.5. Other components and preparation methods are the same as in Example 2.

[0083] Comparative Example 2

[0084] Compared with Example 2, the difference is that the modified acrylic resin is replaced with a commercially available acrylic modified silicone resin emulsion (purchased from Shenzhen Jipeng Silicon Fluorine Materials Co., Ltd., product number SH-9606), while the other components and preparation methods are the same as in Example 2.

[0085] Comparative Example 3

[0086] Compared with Example 2, the difference is that pentaerythritol in the dispersant is replaced with PEG400, while the other components and preparation methods are the same as in Example 2.

[0087] Comparative Example 4

[0088] Compared with Example 2, the difference is that nonylphenol polyoxyethylene (4) ether ammonium sulfate was not added to the dispersant, and the amount of hydroxyethyl cellulose was increased accordingly. That is, the dispersant is composed of hydroxyethyl cellulose and pentaerythritol in a weight ratio of 5:2. Other components and preparation methods are the same as in Example 2.

[0089] Test Example 1: Performance Testing

[0090] The performance indicators of the wall curing agents prepared in Examples 1-3 and Comparative Examples 1-4 of this invention were tested according to the testing methods in Table 1. The test results are shown in Table 2.

[0091] Table 1

[0092]

[0093]

[0094] Table 2

[0095]

[0096] As shown in Table 2, the wall curing agents prepared in Examples 1-3 of this invention exhibited excellent performance in all test results. However, when the raw materials and preparation parameters in the preparation process of the comparative groups were changed, the various properties of the wall curing agents were affected to varying degrees.

[0097] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A wall curing agent with formaldehyde-reducing effect, characterized in that, It includes the following components in parts by weight: The mixture contains 60-70 parts modified acrylic resin emulsion, 20-25 parts deionized water, 3-5 parts propylene glycol ethyl ether acetate, 2-3 parts adipic acid dihydrazide, 1-2 parts dispersant, 6-10 parts sodium hydroxide, 0.8-1.2 parts defoamer, 0.5-1.2 parts nano titanium dioxide, 0.6-1 part silane coupling agent, and 0.5-1 part mildew inhibitor. The modified acrylic resin emulsion is prepared from the following raw materials in parts by weight: 30-40 parts of composite functional monomer, 35-45 parts of deionized water, 2-4 parts of emulsifier, and 0.3-0.8 parts of initiator. The composite functional monomer is composed of methyl methacrylate, isooctyl acrylate, cyclohexyl methacrylate, styrene, and dodecafluoroheptyl methacrylate in a weight ratio of 9~11:6~8:5~9:1~2:3~4. The dispersant is composed of hydroxyethyl cellulose, pentaerythritol and nonylphenol polyoxyethylene (4) ether ammonium sulfate in a weight ratio of 3~5:1~3:

1.

2. The wall curing agent with formaldehyde-reducing effect according to claim 1, characterized in that, The wall curing agent with formaldehyde-reducing effect is composed of the following components in parts by weight: 65 parts modified acrylic resin, 23 parts deionized water, 4 parts propylene glycol ethyl ether acetate, 2.5 parts adipate dihydrazide, 2 parts dispersant, 8 parts sodium hydroxide, 1 part defoamer, 1 part nano titanium dioxide, 0.8 parts silane coupling agent, and 0.7 parts mildew inhibitor.

3. The wall curing agent with formaldehyde-reducing effect according to claim 1, characterized in that, The emulsifier is composed of sodium dodecylbenzenesulfonate and dodecylphenol polyoxyethylene ether in a weight ratio of 2-3:1; the initiator is ammonium persulfate.

4. The wall curing agent with formaldehyde-reducing effect according to claim 1, characterized in that, The preparation method of the modified acrylic resin emulsion includes the following steps: S1. Add emulsifier and deionized water to the reaction vessel, stir evenly, heat to 80~85℃, and purge the reaction vessel with nitrogen to remove oxygen. Then add composite functional monomers and disperse at 5000~6000 rpm for 30~40 min to obtain emulsion. S2. Take 1 / 10 of the emulsion obtained in step S1 and add it to the reactor. Then add 1 / 3 of the initiator. Keep the reaction at 85~90℃ for 10~15 min. Then add the remaining emulsion and initiator obtained in step S1 dropwise to the reactor, controlling the dropwise addition time to 2~3 h. Then continue to keep the reaction at 85~90℃ for 30~40 min, and then cool down to obtain the final product.

5. The wall curing agent with formaldehyde-reducing effect according to claim 1, characterized in that, The silane coupling agent is one of vinyltriethoxysilane, perfluorooctyltrichlorosilane, and γ-aminopropyltriethoxysilane.

6. The wall curing agent with formaldehyde-reducing effect according to claim 1, characterized in that, The defoamer is a polysiloxane-polyether copolymer; the mildew inhibitor is isothiazolinone.

7. The wall curing agent with formaldehyde-reducing effect according to claim 1, characterized in that, The preparation method of the wall curing agent with formaldehyde-reducing effect includes the following preparation steps: Step (1): Add half of the deionized water to the reactor, then add the dispersant, sodium hydroxide and defoamer while stirring, stir evenly, then add nano titanium dioxide, and stir evenly at 6000~7000 rpm to obtain water slurry; Step (2): Add propylene glycol ethyl ether acetate to the water slurry obtained in step (1) and stir until homogeneous. Then, gradually add modified acrylic resin emulsion at a speed of 200-300 rpm for 1-2 hours. Then, add silane coupling agent and adipic acid dihydrazide and stir until homogeneous at a speed of 4000-5000 rpm. Finally, add antifungal agent, stir, and pass through a 300-mesh sieve to obtain the final product.

Images