Water-based odorless elastic interior wall coating and preparation method thereof

Abstract

The invention provides a water-based odorless elastic interior wall coating which is prepared from the following components in parts by weight: 28 to 38 parts of acrylate emulsion, 5 to 15 parts of hyperbranched polysiloxane, 0.1 to 0.5 part of pH (Potential of Hydrogen) regulator, 0.1 to 0.3 part of hydroxyethyl cellulose, 0.1 to 0.2 part of preservative, 0.1 to 0.2 part of wetting agent, 0.1 to 0.5 part of dispersing agent, 0.3 to 0.4 part of defoaming agent, 15 to 25 parts of titanium dioxide, 1 to 7 parts of kaolin, 5 to 15 parts of calcium carbonate, 0.1 to 0.5 part of coalescing agent, 0.1 to 2 parts of anti-freezing agent, 0.05 to 0.2 part of thickening agent and 30 to 50 parts of water. The hyperbranched polysiloxane is prepared by reacting 1, 3-bis (dichloromethyl)-1, 1, 3, 3-tetramethyldisiloxane with 2, 2-diglycolic acid at the temperature of between 70 and 100 DEG C. The invention further discloses a preparation method of the hyperbranched polysiloxane. The water-based odorless elastic interior wall coating provided by the invention has good mechanical properties, weather resistance and water resistance.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a water-based odor-free elastic interior wall coating and a preparation method thereof. Background Art

[0002] Paint, traditionally known as paint, is applied to the surface of the object to be protected or decorated. It can form a continuous film that is firmly attached to the object being coated. It is usually a viscous liquid made of resin, oil or emulsion, with or without pigments, fillers, and corresponding additives, and is prepared with organic solvents or water. In recent years, with the refinement of the market, more and more users have special requirements for wall paint: on the one hand, it requires good environmental performance and no addition of volatile organic substances (VOC), heavy metals, formaldehyde, etc. On the other hand, my country's vast land and complex climate can easily cause thermal expansion and contraction of wall paint. Conventional rigid latex paints are often prone to cracking during use. Based on this, it is necessary to develop a water-based, odorless, elastic interior wall paint to meet market demand. Summary of the invention

[0003] The present invention provides a water-based odorless elastic interior wall paint and a preparation method thereof. The paint has good mechanical properties and can solve the problem of easy cracking of the paint during film formation in the prior art. Moreover, the paint is a water-based paint and can reduce VOC emissions, making it more environmentally friendly.

[0004] According to a first aspect of the present invention, a water-based odorless elastic interior wall paint is provided. The raw materials of the water-based odorless elastic interior wall paint include 28 to 38 parts of acrylic emulsion, 5 to 15 parts of hyperbranched polysiloxane, 0.1 to 0.5 parts of pH regulator, 0.1 to 0.3 parts of hydroxyethyl cellulose, 0.1 to 0.2 parts of preservative, 0.1 to 0.2 parts of wetting agent, 0.1 to 0.5 parts of dispersant, 0.3-0.4 parts of defoaming agent, 15-25 parts of titanium dioxide, 1-7 parts of kaolin, 5-15 parts of calcium carbonate, 0.1-0.5 parts of film-forming aid, 0.1-2 parts of antifreeze agent, 0.05-0.2 parts of thickener and 30-50 parts of water; the hyperbranched polysiloxane is prepared by reacting 1,3-bis(dichloromethyl)-1,1,3,3-tetramethyldisiloxane and 2,2-dihydroxyacetic acid at 70°C-100°C. Using 1,3-bis(dichloromethyl)-1,1,3,3-tetramethyldisiloxane and 2,2-dihydroxyacetic acid as raw materials, a hyperbranched polysiloxane with a high degree of branching and low viscosity can be prepared through a polycondensation reaction under suitable conditions. Based on this, by introducing the hyperbranched polysiloxane into a coating, the elasticity, elongation and tensile strength of the coating can be significantly enhanced, the coating is endowed with excellent mechanical properties, and can effectively cover fine cracks on the wall, thereby having a good beautification and protection effect on the wall, solving the problem of easy cracking of the coating during film formation in the prior art. At the same time, a dense and water-resistant protective film can be formed on the wall surface, effectively isolating water and moisture, improving the easy cleaning property, weather resistance and decorative effect of the coating, and meeting the use requirements of different occasions. In addition, the coating provided by the present invention is a water-based coating, which can reduce VOC emissions and is more environmentally friendly.

[0005] Preferably, the molar ratio of the 1,3-bis(dichloromethyl)-1,1,3,3-tetramethyldisiloxane to the 2,2-dihydroxyacetic acid is 1:(1-4). The hyperbranched polysiloxane prepared according to the above molar ratio has a high degree of branching and low viscosity, and can further improve the mechanical properties, water resistance and weather resistance of the coating.

[0006] Preferably, the raw materials of the acrylic emulsion include polymerizable monomers, initiators and chain transfer agents, and the polymerizable monomers include acrylic monomers, vinyl chloride and vinyl tris(2-methoxyethoxy)silane. By simultaneously introducing vinyl chloride and vinyl tris(2-methoxyethoxy)silane into the emulsion polymerization system, vinyl chloride and vinyl tris(2-methoxyethoxy)silane can play a synergistic role, so that the water resistance, weather resistance and mechanical properties of the acrylic emulsion obtained after emulsion polymerization and the coating thereof are improved, and the cracking problem of the coating in various climates is effectively improved.

[0007] Preferably, in the polymerizable monomer, the mass ratio of the acrylic ester monomer, the vinyl chloride, and the vinyl tris(2-methoxyethoxy)silane is 30-60:10-20:5-10.

[0008] Preferably, the acrylate monomers include acrylate soft monomers and acrylate hard monomers, wherein the mass ratio of the acrylate soft monomers to the acrylate hard monomers is 25 to 40:15 to 25. Reasonable setting of the feed ratio of soft and hard monomers is conducive to further improving the flexibility and tensile strength of the acrylate emulsion.

[0009] Preferably, the chain transfer agent includes ethylene trithiocarbonate. The chain transfer agent has good compatibility with acrylic monomers, vinyl chloride, and vinyl tris(2-methoxyethoxy)silane, which is conducive to controlling the rate of emulsion polymerization and achieving effective regulation of the molecular weight and distribution of acrylic emulsion, thereby optimizing the comprehensive performance of the coating, and improving the mechanical properties, water resistance, weather resistance and stability of the coating as a whole.

[0010] Preferably, the preparation method of the acrylic emulsion comprises the following operations: step 1, mixing water, an emulsifier, and the polymerizable monomer to obtain a pre-emulsion; step 2, mixing part of the pre-emulsion, the initiator, and the chain transfer agent at 75 to 95° C. to obtain an intermediate reaction liquid; step 3, adding the remaining pre-emulsion, the initiator, and the chain transfer agent to the intermediate reaction liquid at 75 to 95° C. and keeping the temperature for 3 to 5 hours, thereby obtaining the acrylic emulsion. By adding the pre-emulsion, the initiator, and the chain transfer agent step by step, it is beneficial to control the rate of emulsion polymerization and ensure that the polymerization reaction is fully and smoothly carried out, thereby being able to synthesize an acrylic emulsion with a suitable molecular weight and a uniform molecular weight distribution, thereby improving the stability, weather resistance, water resistance, and mechanical properties of the acrylic emulsion.

[0011] Preferably, the total mass of the polymerizable monomers in the pre-emulsion used in the preparation method: the total mass of the initiator used in the preparation method: the total mass of the chain transfer agent used in the preparation method = 1: (0.01-0.05): (0.02-0.1).

[0012] Preferably, the mass ratio of the pre-emulsion in step 2 to the pre-emulsion in step 3 is 30-35:65-70; the mass ratio of the initiator in step 2 to the initiator in step 3 is 30-35:65-70; the mass ratio of the chain transfer agent in step 2 to the chain transfer agent in step 3 is 30-35:65-70. By precisely controlling the proportion of the polymerization monomer, initiator and chain transfer agent fed in steps, it is beneficial to ensure that the polymerization reaction is fully and smoothly carried out, so that the prepared acrylic emulsion has a suitable molecular weight and a uniform molecular weight distribution level, so that the comprehensive performance of the coating is further optimized, and the problems of uneven molecular weight distribution of the acrylic emulsion leading to deterioration of its mechanical properties, weather resistance and water resistance are avoided.

[0013] According to another aspect of the present invention, a method for preparing the above-mentioned water-based odor-free elastic interior wall paint is provided, comprising the following operations: mixing a pH regulator, hydroxyethyl cellulose and water, then sequentially adding a preservative, a wetting agent, a dispersant, a defoaming agent, titanium dioxide, kaolin, and calcium carbonate, then adding an acrylic emulsion, and subsequently adding a hyperbranched polysiloxane, a film-forming aid, an antifreeze agent, a thickener, and a defoaming agent, and stirring evenly to obtain the water-based odor-free elastic interior wall paint.

[0014] Preferably, the pH adjuster comprises 2-amino-2-methyl-1-propanol.

[0015] Preferably, the hydroxyethylcellulose comprises a nonionic water-soluble cellulose ether.

[0016] Preferably, the preservative includes at least one of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one.

[0017] Preferably, the dispersant includes an ammonium polyacrylate dispersant or a sodium polyacrylate dispersant.

[0018] Preferably, the defoaming agent comprises a mineral oil defoaming agent or a silicone defoaming agent.

[0019] Preferably, the titanium dioxide comprises rutile titanium dioxide.

[0020] Preferably, the kaolin comprises calcined kaolin.

[0021] Preferably, the calcium carbonate comprises ground calcium carbonate.

[0022] Preferably, the coalescent comprises Eastman OE300.

[0023] Preferably, the thickener comprises an associative polyurethane thickener. DETAILED DESCRIPTION

[0024] The following is a further clear and complete description of the technical features in the technical solution provided by the present invention in conjunction with the specific implementation methods. 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] The present embodiment provides a water-based odorless elastic interior wall paint. Calculated in parts by weight, the raw materials of the water-based odorless elastic interior wall paint include 34 parts of acrylic emulsion, 8 parts of hyperbranched polysiloxane, 0.1 part of pH adjuster, 0.2 part of hydroxyethyl cellulose, 0.15 part of preservative, 0.15 part of wetting agent, 0.45 part of dispersant, 0.39 part of defoaming agent, 22 parts of titanium dioxide, 6 parts of kaolin, 13 parts of calcium carbonate, 0.48 part of film-forming aid, 0.8 part of antifreeze agent, 0.05 part of thickener, and 35 parts of water.

[0027] The preparation method of water-based odor-free elastic interior wall paint comprises the following operations:

[0028] 1. Preparation of acrylic emulsion

[0029] The raw materials of acrylic emulsion include polymerization monomers, initiators and chain transfer agents. The polymerization monomers include acrylic ester monomers, vinyl chloride and vinyl tri(2-methoxyethoxy) silane. The mass ratio of acrylic ester monomers, vinyl chloride and vinyl tri(2-methoxyethoxy) silane is 50:20:5. The acrylic ester monomers are composed of acrylic ester soft monomers and acrylic ester hard monomers in a mass ratio of 30:20.

[0030] The preparation method of acrylic emulsion comprises the following operations:

[0031] Step 1, mixing water, an emulsifier, glacial acetic acid, an acrylic ester monomer, and vinyl tris(2-methoxyethoxy)silane evenly, and then adding vinyl chloride under nitrogen protection to obtain a pre-emulsion;

[0032] Step 2: transfer the pre-emulsion to a sealed reaction kettle, add an initiator and a chain transfer agent, ethylene trithiocarbonate, and then react at 75° C. for 3 hours under continuous stirring and nitrogen protection to obtain an intermediate reaction liquid;

[0033] Step 3, adding the remaining pre-emulsion, initiator and chain transfer agent to the intermediate reaction liquid at 75° C. and keeping warm for 4 hours. After the reaction is completed, cooling to room temperature and then filtering to obtain an acrylic emulsion.

[0034] Among them, the total mass of the polymerized monomers in the pre-emulsion used in the preparation method: the total mass of the initiator used in the preparation method: the total mass of the chain transfer agent used in the preparation method = 1:0.04:0.04; the mass ratio of the pre-emulsion in step two to the pre-emulsion in step three, the mass ratio of the chain transfer agent in step two to the chain transfer agent in step three, and the mass ratio of the initiator in step two to the initiator in step three are all 30:70.

[0035] 2. Preparation of hyperbranched polysiloxane

[0036] 1,3-bis(dichloromethyl)-1,1,3,3-tetramethyldisiloxane and 2,2-dihydroxyacetic acid are mixed in a molar ratio of 1:4 and a solvent is added and stirred to disperse evenly, then a catalyst is added and the temperature is raised to 85°C to react for 48 hours; after the reaction, centrifugal filtration is performed, and the precipitate is collected and dried overnight to obtain a hyperbranched polysiloxane.

[0037] 3. Preparation of water-based odorless elastic interior wall coating

[0038] (1) Add water to a dispersion tank, add a pH adjuster, and then add hydroxyethyl cellulose. The speed of the dispersion tank is controlled at 550 r / min, and the dispersion is continued for 5 minutes.

[0039] (2) Slowly add preservative, wetting dispersant, and defoamer, adjust the speed of the dispersion cylinder to 650 r / min, and continue dispersing for 8 minutes;

[0040] (3) Add titanium dioxide, kaolin, and calcium carbonate in sequence, adjust the speed of the dispersion cylinder to 1500 r / min, and continue dispersing for 30 minutes;

[0041] (4) Maintaining the speed of the dispersion cylinder at 650 r / min, slowly add the acrylic emulsion and continue dispersing for 8 min;

[0042] (5) reducing the speed of the dispersion tank to 400 r / min, adding hyperbranched polysiloxane, film-forming aid, antifreeze agent, thickener, and defoamer, and continuing to disperse in the dispersion tank for 10 min until the system is a uniform, particle-free mixture, thereby preparing a water-based, odor-free elastic interior wall paint.

[0043] Example 2

[0044] This embodiment prepares water-based odorless elastic interior wall paint with reference to Example 1. The difference between this embodiment and Example 1 is that in the process of preparing the acrylic emulsion in this embodiment, the vinyl triethoxy silane of the same mass is used to replace the vinyl tri (2-methoxyethoxy) silane in Example 1. Except for the above differences, the materials and process operations used in this embodiment are strictly consistent with those in Example 1.

[0045] Example 3

[0046] This embodiment prepares water-based odor-free elastic interior wall paint with reference to Example 1. The difference between this embodiment and Example 1 is that in the process of preparing the acrylic ester emulsion in this embodiment, the polymerizable monomers used only include acrylic ester monomers and vinyl chloride (excluding vinyl tris(2-methoxyethoxy)silane). Except for the above differences, the materials and process operations used in this embodiment are strictly consistent with those in Example 1.

[0047] Example 4

[0048] This embodiment prepares water-based odor-free elastic interior wall paint with reference to Example 1. The difference between this embodiment and Example 1 is that in the process of preparing the acrylic ester emulsion in this embodiment, the polymerizable monomers used only include acrylic ester monomers and vinyl tris (2-methoxyethoxy) silane (excluding vinyl chloride). Except for the above differences, the materials and process operations used in this embodiment are strictly consistent with those in Example 1.

[0049] Example 5

[0050] This embodiment prepares water-based odor-free elastic interior wall paint with reference to Example 1. The difference between this embodiment and Example 1 is that in the process of preparing the acrylic emulsion in this embodiment, the mass ratio of acrylic acid ester monomer, vinyl chloride, and vinyl tris (2-methoxyethoxy) silane in the polymerization monomer used is 40:15:15. Except for the above differences, the materials and process operations used in this embodiment are strictly consistent with those in Example 1.

[0051] Example 6

[0052] This embodiment prepares water-based odor-free elastic interior wall paint with reference to Example 1. The difference between this embodiment and Example 1 is that in the process of preparing the acrylic emulsion in this embodiment, the mass ratio of acrylic acid ester monomer, vinyl chloride, and vinyl tris (2-methoxyethoxy) silane in the polymerization monomer used is 40:15:3. Except for the above differences, the materials and process operations used in this embodiment are strictly consistent with those in Example 1.

[0053] Example 7

[0054] This example prepares a water-based odorless elastic interior wall paint with reference to Example 1. The difference between this example and Example 1 is that in the process of preparing the acrylic emulsion, the same mass of dodecyl mercaptan is used to replace the ethylene trithiocarbonate in Example 1 as a chain transfer agent. Except for the above differences, the materials and process operations used in this example are strictly consistent with those in Example 1.

[0055] Example 8

[0056] This embodiment prepares water-based odorless elastic interior wall paint with reference to Example 1. The difference between this embodiment and Example 1 is that in the process of preparing the acrylic emulsion, the same mass of benzyl dithiobenzoate is used to replace the ethylene trithiocarbonate in Example 1 as a chain transfer agent. Except for the above differences, the materials and process operations used in this embodiment are strictly consistent with those in Example 1.

[0057] Example 9

[0058] This embodiment prepares water-based odorless elastic interior wall paint with reference to embodiment 1. The difference between this embodiment and embodiment 1 is that in the process of preparing the acrylic emulsion in this embodiment, the mass ratio of the chain transfer agent in step 2 to the chain transfer agent in step 3 is 20:80. Except for the above difference, the materials and process operations used in this embodiment are strictly consistent with those in embodiment 1.

[0059] Example 10

[0060] This embodiment prepares water-based odorless elastic interior wall paint with reference to embodiment 1. The difference between this embodiment and embodiment 1 is that in the process of preparing the acrylic emulsion in this embodiment, the mass ratio of the chain transfer agent in step 2 to the chain transfer agent in step 3 is 40:60. Except for the above difference, the materials and process operations used in this embodiment are strictly consistent with those in embodiment 1.

[0061] Comparative Example 1

[0062] This comparative example is prepared with reference to Example 1. The difference between this comparative example and Example 1 is that the raw materials of the water-based odorless elastic interior wall paint used in this comparative example do not include hyperbranched polysiloxane. Except for the above difference, the materials and process operations used in this comparative example are strictly consistent with those in Example 1.

[0063] Comparative Example 2

[0064] This comparative example refers to Example 1 to prepare a water-based odorless elastic interior wall coating. The difference between this comparative example and Example 1 is that in the process of preparing hyperbranched polysiloxane, the same molar amount of 3,5-dihydroxybenzoic acid is used to replace the 2,2-dihydroxyacetic acid in Example 1. Except for the above differences, the materials and process operations used in this comparative example are strictly consistent with those in Example 1.

[0065] Comparative Example 3

[0066] This comparative example refers to Example 1 to prepare a water-based odorless elastic interior wall coating. The difference between this comparative example and Example 1 is that in the process of preparing the hyperbranched polysiloxane in this comparative example, the reaction temperature is adjusted to 60° C. In addition to the above differences, the materials and process operations used in this comparative example are strictly consistent with those in Example 1.

[0067] Comparative Example 4

[0068] This comparative example refers to Example 1 to prepare a water-based odorless elastic interior wall coating. The difference between this comparative example and Example 1 is that in the process of preparing the hyperbranched polysiloxane in this comparative example, the reaction temperature is adjusted to 110° C. In addition to the above differences, the materials and process operations used in this comparative example are strictly consistent with those in Example 1.

[0069] Test Case

[0070] 1. Participants

[0071] This test example uses the water-based odorless elastic interior wall coatings prepared in Examples 1 to 10 and Comparative Examples 1 to 4 as the test objects of this test example.

[0072] 2. Test items

[0073] (1) Tensile strength and elongation at break: Tested in accordance with GB / T16777-1997 “Test methods for building waterproof coatings”.

[0074] (2) Water resistance and resistance to artificial weathering: Tested in accordance with JG / T 24-2018 "Synthetic resin emulsion sand-walled architectural coatings".

[0075] 3. Test results

[0076] Table 1 Performance test results of coatings of Examples 1 to 10 and Comparative Examples 1 to 4

[0077]

[0078]

[0079] The test results are shown in Table 1. The performance test results of Example 1 are compared with those of Comparative Examples 1 to 4. As shown in Table 1, under the same conditions of other materials and operations for preparing the coating, the coating of Comparative Example 1 does not include hyperbranched polysiloxane, Comparative Example 2 uses 3,5-dihydroxybenzoic acid as a raw material in the process of preparing hyperbranched polysiloxane, and the reaction temperatures of Comparative Examples 3 and 4 in the process of preparing hyperbranched polysiloxane are respectively lower than 70°C and higher than 100°C, and the tensile strength, elongation at break, water resistance and artificial aging resistance of the coating obtained are lower than those of Example 1. It can be seen that, relative to Comparative Examples 1 to 4, Example 1 uses 1,3-bis(dichloromethyl)-1,1,3,3-tetramethyldisiloxane and 2,2-dihydroxyacetic acid as raw materials, and can prepare a hyperbranched polysiloxane with high branching degree and low viscosity through polycondensation reaction under appropriate conditions. By introducing the hyperbranched polysiloxane into the coating, the water resistance, weather resistance and mechanical properties of the coating can be improved.

[0080] The performance test results of Example 1 are compared with those of Examples 2 to 4. As shown in Table 1, under the same conditions of other materials and operations for preparing the coating, Example 2 uses vinyl triethoxysilane as the organosilicon monomer in the polymerization monomer in the process of preparing the acrylic emulsion, and Examples 3 and 4 do not include organosilicon monomers vinyl tris (2-methoxyethoxy) silane and vinyl chloride in the polymerization monomers used in the process of preparing the acrylic emulsion, respectively. The mass ratio of acrylic monomers, vinyl chloride, and vinyl tris (2-methoxyethoxy) silane in the polymerization monomers used in Examples 5 and 6 does not meet 30 to 60: 10 to 20: 5 to 10, and the tensile strength, elongation at break, water resistance, and artificial aging resistance of the coating obtained are lower than those of Example 1. This shows that, compared with Examples 2 to 6, in Example 1, by simultaneously introducing vinyl chloride and vinyl tri(2-methoxyethoxy) silane in a suitable ratio into the emulsion polymerization system during the acrylic ester emulsion polymerization process, vinyl chloride and vinyl tri(2-methoxyethoxy) silane can play a synergistic role, so that the acrylic ester emulsion and its coating obtained after the emulsion polymerization have better water resistance, weather resistance and mechanical properties.

[0081] The performance test results of Example 1 and Examples 7-8 are compared. As shown in Table 2, under the same conditions of other materials and operations for preparing the coating, Examples 7 and 8 respectively use dodecyl mercaptan and benzyl dithiobenzoate as chain transfer agents in the process of preparing the acrylic emulsion, and the tensile strength, elongation at break, water resistance, and artificial aging resistance of the coating obtained are lower than those of Example 1. This shows that, compared with Examples 7-8, Example 1 uses a specific chain transfer agent, which has good compatibility with acrylic monomers, vinyl chloride, and vinyl tris(2-methoxyethoxy)silane, is conducive to controlling the emulsion polymerization rate, and effectively controlling the molecular weight and distribution of the acrylic emulsion, thereby optimizing the comprehensive performance of the coating, making the water resistance, weather resistance, and mechanical properties of the coating better.

[0082] The performance test results of Example 1 are compared with those of Examples 9-10. As shown in Table 1, under the same conditions of other materials and operations for preparing the coating, the mass ratio of the chain transfer agent in step 2 to the chain transfer agent in step 3 in the process of preparing the acrylic emulsion in Examples 10 and 11 is lower than and higher than 30-35:65-70 respectively, and the tensile strength, elongation at break, water resistance and artificial aging resistance of the coating obtained are lower than those of Example 1. This shows that, compared with Examples 9-10, Example 1 is conducive to promoting the polymerization reaction to proceed fully and smoothly by precisely controlling the proportion of the chain transfer agent distribution feed, so that the prepared acrylic emulsion has a good molecular weight and its distribution level, thereby making the water resistance, weather resistance and mechanical properties of the coating better.

[0083] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the technical solutions of the present invention can be modified or equivalently replaced, but these modifications or replacements are all within the protection scope of the present invention.

Claims

1. A water-based odorless elastic interior wall paint, characterized in that: Calculated by weight, the raw materials of the water-based odorless elastic interior wall paint include 28-38 parts of acrylic emulsion, 5-15 parts of hyperbranched polysiloxane, 0.1-0.5 parts of pH adjuster, 0.1-0.3 parts of hydroxyethyl cellulose, 0.1-0.2 parts of preservative, 0.1-0.2 parts of wetting agent, 0.1-0.5 parts of dispersant, 0.3-0.4 parts of defoamer, 15-25 parts of titanium dioxide, 1-7 parts of kaolin, 5-15 parts of calcium carbonate, 0.1-0.5 parts of film-forming aid, 0.1-2 parts of antifreeze, 0.05-0.2 parts of thickener, and 30-50 parts of water; The hyperbranched polysiloxane is prepared by reacting 1,3-bis(dichloromethyl)-1,1,3,3-tetramethyldisiloxane and 2,2-dihydroxyacetic acid at 70°C to 100°C.

2. The water-based odorless elastic interior wall paint according to claim 1, characterized in that: The molar ratio of the 1,3-bis(dichloromethyl)-1,1,3,3-tetramethyldisiloxane to the 2,2-dihydroxyacetic acid is 1:(1-4).

3. The water-based odorless elastic interior wall paint according to claim 1, characterized in that: The raw materials of the acrylic ester emulsion include polymerizable monomers, an initiator and a chain transfer agent. The polymerizable monomers include acrylic ester monomers, vinyl chloride and vinyl tris(2-methoxyethoxy)silane.

4. The water-based odorless elastic interior wall paint as claimed in claim 3, characterized in that: In the polymerizable monomer, the mass ratio of the acrylic ester monomer, the vinyl chloride, and the vinyl tris(2-methoxyethoxy)silane is 30-60:10-20:5-10.

5. The water-based odorless elastic interior wall paint as claimed in claim 3, characterized in that: The acrylic acid ester monomers include acrylic acid ester soft monomers and acrylic acid ester hard monomers, wherein the mass ratio of the acrylic acid ester soft monomers to the acrylic acid ester hard monomers is 25-40:15-25.

6. The water-based odorless elastic interior wall paint as claimed in claim 3, characterized in that: The chain transfer agent includes ethylene trithiocarbonate.

7. The water-based odorless elastic interior wall paint according to any one of claims 3 to 6, characterized in that: The preparation method of the acrylic emulsion comprises the following operations: Step 1, mixing water, an emulsifier and the polymerization monomer to prepare a pre-emulsion; Step 2, mixing part of the pre-emulsion, the initiator and the chain transfer agent at 75-95° C. to obtain an intermediate reaction liquid; Step 3: adding the remaining pre-emulsion, the initiator and the chain transfer agent to the intermediate reaction liquid at 75-95° C. and keeping the temperature for 3-5 hours to obtain the acrylic ester emulsion.

8. The water-based odorless elastic interior wall paint as claimed in claim 7, characterized in that: The total mass of the polymerizable monomers in the pre-emulsion used in the preparation method: the total mass of the initiator used in the preparation method: the total mass of the chain transfer agent used in the preparation method = 1: (0.01-0.05): (0.02-0.1).

9. The water-based odorless elastic interior wall paint as claimed in claim 8, characterized in that: The mass ratio of the pre-emulsion in step 2 to the pre-emulsion in step 3 is 30-35:65-70; The mass ratio of the initiator in step 2 to the initiator in step 3 is 30-35:65-70; The mass ratio of the chain transfer agent in step 2 to the chain transfer agent in step 3 is 30-35:65-70.

10. A method for preparing the water-based odorless elastic interior wall paint according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing a pH regulator, hydroxyethyl cellulose and water, then sequentially adding a preservative, a wetting agent, a dispersant, a defoaming agent, titanium dioxide, kaolin and calcium carbonate, then adding an acrylic emulsion, and subsequently adding a hyperbranched polysiloxane, a film-forming aid, an antifreeze agent, a thickener and a defoaming agent, and stirring evenly to prepare the water-based odorless elastic interior wall paint.

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