A kind of interior wall putty powder and preparation method thereof

Abstract

The present invention provides an interior wall putty powder and a preparation method thereof, which relates to the technical field of building materials. The preparation method of the interior wall putty powder comprises: S100, preparing a heat insulating filler; S200, mixing the heat insulating filler and calcium carbonate, and performing a compatibility modification treatment to obtain a first mixture; S300, uniformly mixing the first mixture and auxiliary materials to obtain the interior wall putty powder. The interior wall putty powder prepared by the present invention has good heat insulating performance, and is not easy to crack or fall off.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to an interior wall putty powder and a preparation method thereof. Background Art

[0002] Putty powder is an important building decoration material, usually used to repair and level the wall surface, and to lay the foundation for subsequent painting. At present, the main components of putty powder are calcium carbonate powder, glue and small materials.

[0003] The putty powder in the prior art has the following deficiencies: First, due to factors such as construction conditions and use environment, the putty powder is prone to cracking and falling off, so the quality and stability of the putty powder is the guarantee of construction quality. How to provide a putty powder that is not easy to crack is one of the technical problems that the technicians in this field are committed to solving; secondly, providing a putty powder with better thermal insulation performance has also become a research trend in this field; finally, the problem that the putty powder is easily affected by moisture and mold is also a technical problem that the technicians in this field have always been committed to solving. Summary of the invention

[0004] One of the problems solved by the present invention is how to provide a putty powder that is not easy to crack or fall off and has heat preservation and heat insulation performance. On this basis, another problem solved by the present invention is how to prevent the putty powder from getting damp and moldy.

[0005] In order to solve the above problems, the present invention provides a method for preparing interior wall putty powder, which comprises:

[0006] S100, preparing thermal insulation filler;

[0007] S200, mixing the thermal insulation filler and calcium carbonate, and performing compatibility modification treatment to obtain a first mixture;

[0008] S300, uniformly mixing the first mixture and auxiliary materials to obtain interior wall putty powder;

[0009] Among them, S100 specifically includes:

[0010] S110, ultrasonically dispersing titanium dioxide in a mixture of water and ethanol to obtain a titanium dioxide suspension;

[0011] S120, adding silicon tetrachloride dropwise to the titanium dioxide suspension while stirring simultaneously, and after the addition is complete, adding citric acid to adjust the pH value to 3-4 and continue stirring for 2h to 2.5h to obtain a silicon dioxide hydrolyzate containing titanium dioxide;

[0012] S130, adding sodium hydroxide to the silicon dioxide hydrolyzate, mixing evenly and standing for 1.5 to 2 hours to obtain a silicon dioxide sol containing titanium dioxide;

[0013] S140, soaking the silica sol in ethanol and aging it for 18 to 20 hours, taking it out and performing supercritical drying to obtain a thermal insulation filler.

[0014] Further, in S110, the mass ratio of titanium dioxide: water: ethanol = (0.5-1): (30-32): 100; in S120, silicon tetrachloride is added dropwise to the titanium dioxide suspension according to the amount of ethanol added in S110, and the mass ratio of silicon tetrachloride: ethanol = (4-6): 100; in S130, the mass ratio of sodium hydroxide: silicon dioxide hydrolyzate = (2-4): 100.

[0015] Furthermore, S200 specifically includes:

[0016] S210, uniformly mixing tetrabutyl phosphine hydroxide, calcium hydroxide and magnesium acetate in water to obtain a first treating agent;

[0017] S220, mixing the heat insulating filler and calcium carbonate in the first treatment agent uniformly and soaking them for 15 to 20 minutes to complete the compatibility modification treatment;

[0018] S230, filtering the solids and drying them to obtain a first mixture.

[0019] Further, in S210, by mass ratio, tetrabutyl phosphine hydroxide: calcium hydroxide: magnesium acetate: water = (0.1-0.2): (0.12-0.16): (1.5-2): 100; in S220, by mass ratio, thermal insulation filler: calcium carbonate: first treatment agent = (4-6): (50-60): 100.

[0020] Further, in S210, tetrabutyl phosphine hydroxide, calcium hydroxide and magnesium acetate are uniformly mixed in water in the order of adding calcium hydroxide first, and then adding tetrabutyl phosphine hydroxide and magnesium acetate.

[0021] Furthermore, in S220, the thermal insulation filler and calcium carbonate are evenly mixed in the first treatment agent by first mixing the thermal insulation filler and calcium carbonate evenly, and then placing them together in the first treatment agent and stirring them.

[0022] Furthermore, in S300, the auxiliary materials include: a film former, a dispersant, a thickener, a redispersible latex powder, talcum powder, and white cement.

[0023] Furthermore, S300 specifically includes:

[0024] According to the mass ratio of film former: dispersant: thickener: redispersible latex powder: talcum powder: white cement: first mixture = (0.4-0.6): (0.4-0.6): (0.5-1): (2-3): (4-6): (18-20): 100, the first mixture and auxiliary materials are evenly mixed to obtain interior wall putty powder.

[0025] Furthermore, the film-forming agent is prepared by mixing styrene resin, polyurethane resin, ethylene glycol and methyl cellulose in a weight ratio of 15:10:5:0.2; the dispersant is sodium lauryl sulfate, and the thickener is hydroxypropyl methyl cellulose ether.

[0026] The present invention also provides an interior wall putty powder, which is obtained by adopting the preparation method of any of the above technical solutions.

[0027] Beneficial Effects

[0028] The present invention provides a method for preparing interior wall putty powder, wherein the method comprises mixing a heat insulating filler and calcium carbonate, and performing a compatibility modification treatment to obtain a first mixture; and then uniformly mixing the first mixture and auxiliary materials to obtain interior wall putty powder. The heat insulating filler of the present invention is silica aerogel. Silica aerogel is a porous material formed by micron-sized or nano-sized silica particles, and has a nanoporous network structure. Silica aerogel has an extremely low thermal conductivity and is a heat insulating material with excellent performance. In order to obtain a silica aerogel with good performance, the present invention first ultrasonically disperses titanium dioxide in a mixture of water and ethanol to obtain a titanium dioxide suspension; then silicon tetrachloride is added to the titanium dioxide suspension and stirred synchronously, and after the addition is completed, citric acid is added to adjust the pH value to 3-4 and continue stirring for 2h to 2.5h to obtain a silica hydrolyzate containing titanium dioxide; then sodium hydroxide is added to the silica hydrolyzate, mixed evenly and left to stand for 1.5h to 2h to obtain a silica sol containing titanium dioxide; finally, the silica sol is immersed in ethanol and aged for 18h to 20h, then taken out for supercritical drying to obtain a thermal insulation filler. Through the above steps, a silica aerogel thermal insulation filler with good thermal insulation performance and loaded with titanium dioxide can be obtained. Thus, the interior wall putty powder prepared by the present invention has good thermal insulation performance, and it is not easy to crack or fall off. In addition, since the present invention mixes the heat insulating filler and calcium carbonate and performs a compatibility modification treatment before mixing and preparing the putty powder, the compatibility between the heat insulating filler and calcium carbonate of the present invention is better, and the interior wall putty powder prepared by the present invention has the effect of not being easy to crack and fall off. Finally, since the interior wall putty powder of the present invention contains titanium dioxide, it is not easy to mold. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description of the specific embodiments of the present invention.

[0030] Unless otherwise specified, the reagents and raw materials used in the present invention can be purchased through commercial channels. The experimental methods in the following examples without specifying specific conditions are selected according to conventional methods and conditions, or according to the product specifications.

[0031] Putty powder is a widely used building decoration material. The disadvantage of putty powder in the prior art is that it is prone to cracking and falling off. In addition, how to provide putty powder with better thermal insulation performance is also an important research trend in this field. In order to improve the thermal insulation performance of putty powder, new attempts such as adding silica aerogel, diatomaceous earth, and bentonite to putty powder have appeared in the prior art. Among them, silica aerogel has a nanoporous network structure and its particles are full of pores, so it is a thermal insulation material with relatively excellent performance. However, since silica aerogel has a large difference in physical and chemical properties from the main ingredient calcium carbonate in putty powder, the two and other auxiliary materials that may be added are added with water to be configured as putty paste and used for a long time, the cracking and falling off problems of putty materials that are already prone to cracking and falling off will be aggravated. Therefore, in the case of using silica aerogel as a thermal insulation filler, how to further effectively ensure that putty powder is not easy to crack and fall off has become a technical problem that needs to be solved by technicians in this field.

[0032] To this end, the embodiment of the present invention provides the following preparation method of interior wall putty powder, the preparation method comprising:

[0033] S100, preparing thermal insulation filler;

[0034] S200, mixing the thermal insulation filler and calcium carbonate, and performing compatibility modification treatment to obtain a first mixture;

[0035] S300, uniformly mixing the first mixture and auxiliary materials to obtain interior wall putty powder.

[0036] In the above steps, the thermal insulation filler is silica aerogel, and titanium dioxide is uniformly mixed in the silica aerogel. S100 specifically includes:

[0037] S110, ultrasonically dispersing titanium dioxide in a mixture of water and ethanol to obtain a titanium dioxide suspension;

[0038] S120, adding silicon tetrachloride dropwise to the titanium dioxide suspension while stirring simultaneously, and after the addition is complete, adding citric acid to adjust the pH value to 3-4 and continue stirring for 2h to 2.5h to obtain a silicon dioxide hydrolyzate containing titanium dioxide;

[0039] S130, adding sodium hydroxide to the silicon dioxide hydrolyzate, mixing evenly and standing for 1.5 to 2 hours to obtain a silicon dioxide sol containing titanium dioxide;

[0040] S140, soaking the silica sol in ethanol and aging it for 18 to 20 hours, taking it out and performing supercritical drying to obtain a thermal insulation filler.

[0041] The above steps prepare a silica aerogel containing titanium dioxide by a sol-gel method. To achieve this purpose, the above steps require that silicon tetrachloride be added dropwise into a hydroalcohol solution, and a silica hydrolyzate is obtained by a hydrolysis reaction under the condition of citric acid as a catalyst. In this process, since titanium dioxide is uniformly dispersed in the hydroalcohol solution of S110, the silica hydrolyzate obtained in S120 is also a silica hydrolyzate uniformly dispersed with titanium dioxide. Furthermore, through S130, a silica sol uniformly dispersed with titanium dioxide can be obtained through a polycondensation reaction under alkaline conditions. By standing still in ethanol, the silica sol can be aged and its stability is enhanced. Finally, through supercritical drying of S140, a silica aerogel with a three-dimensional porous structure can be obtained, and titanium dioxide is uniformly dispersed in the three-dimensional porous structure of silica.

[0042] Preferably, in S110, the mass ratio of titanium dioxide: water: ethanol = (0.5-1): (30-32): 100. Preferably, in S120, silicon tetrachloride is added dropwise to the titanium dioxide suspension according to the amount of ethanol added in S110, and the mass ratio of silicon tetrachloride: ethanol = (4-6): 100. Preferably, in S130, the mass ratio of sodium hydroxide: silicon dioxide hydrolyzate = (2-4): 100.

[0043] It can be understood that in the above steps, citric acid and sodium hydroxide can be prepared into aqueous solutions and then added. The concentrations of citric acid and sodium hydroxide aqueous solutions have no essential effect on the realization of the effects of the present invention, and those skilled in the art can select and adjust them according to actual needs.

[0044] It is understood that those skilled in the art can select and adjust the particle size of the titanium dioxide added in S100 according to actual needs. Preferably, the particle size of the titanium dioxide added in S100 is D50 less than or equal to 4 nm.

[0045] It is understood that those skilled in the art can select and adjust the medium and conditions of supercritical drying in S140 according to actual needs. Preferably, the medium of supercritical drying in S140 is ethanol, and the specific process parameters of S140 are: after the silica sol is immersed in ethanol and aged for 18h to 20h, it is taken out and sent to a vacuum reactor, ethanol vapor is introduced into the reactor, and it is heated and pressurized, and the temperature and pressure are maintained at 247°C to 253°C and the pressure is 6.6MPa to 7.0MPa for more than 2h, and then the temperature is reduced and the pressure is released.

[0046] The purpose of the above steps is to prepare a silica aerogel uniformly loaded with titanium dioxide, and use it as a thermal insulation filler to give putty powder a better thermal insulation effect. And the photocatalytic effect of titanium dioxide can decompose organic matter, preventing putty powder from getting moldy due to moisture during long-term use. Through the above steps S110 to S140, a silica aerogel uniformly loaded with titanium dioxide can be prepared. Since titanium dioxide is mixed with a liquid silicon source in advance, compared to the physical mixing of titanium dioxide and silica aerogel, the method of the present invention can achieve a uniform dispersion of titanium dioxide, so that it is distributed in the three-dimensional porous structure of silica. On the one hand, nano-sized titanium dioxide has a high surface energy, so if it is directly added, it is easy to precipitate during the storage of putty powder, and it is easy to agglomerate in putty paste. If titanium dioxide is loaded in the three-dimensional porous structure of silica aerogel, it can effectively avoid its precipitation or agglomeration. On the other hand, the specific surface area of ​​titanium dioxide after precipitation or agglomeration is reduced, and its photocatalytic efficiency and mildew-proof effect will also deteriorate. The treatment method of the present invention is helpful to improve the mildew-proof effect of putty powder by hindering the precipitation or agglomeration of titanium dioxide.

[0047] Preferably, after S140, the present invention can also perform post-treatment on the thermal insulation filler. The purpose of the post-treatment is to partially close the pores on the surface of the silica aerogel thermal insulation filler with a phase change material without filling the internal three-dimensional porous structure of the silica aerogel thermal insulation filler.

[0048] Specifically, the present invention performs post-processing on the thermal insulation filler through the following steps:

[0049] S151, mixing Tween 60, n-octadecane, paraffin and thermal insulation filler in vegetable oil in a mass ratio of Tween 60: n-octadecane: paraffin: thermal insulation filler: vegetable oil = (0.2-0.4): (2-4): (3-5): (40-50): 100, heating to 45° C.-55° C., and uniformly emulsifying by ultrasonication to obtain an oil phase emulsion containing the thermal insulation filler;

[0050] S152, mixing melamine, 45 wt % formaldehyde aqueous solution and water in a mass ratio of melamine: formaldehyde solution: water = (45-55): 100: 100, adjusting the pH value to neutral, heating to 55° C.-65° C. and stirring and mixing until viscous, to obtain a wall material solution;

[0051] S153. Heat the oil phase emulsion to 55°C-65°C, add the wall material solution dropwise thereto and stir simultaneously, and after the addition is completed, allow to react for 1.5 to 2 hours, cool naturally and adjust the pH value to neutral, add urea to remove residual formaldehyde, filter, wash with a mixture of ethanol and water above 60°C for 2-3 times, and dry to obtain a post-treated thermal insulation filler.

[0052] The reason for adopting the above steps is that n-octadecane and paraffin are used as sealing agents to partially seal the pores on the surface of the silica aerogel thermal insulation filler, which reduces the surface energy of the silica aerogel on the one hand, and on the other hand, the present invention uses the phase change material and the thermal insulation filler particles as the core material, which are coated in the polymer wall material. The phase change material compounded with n-octadecane and paraffin changes phase to store heat at high room temperature, and changes phase to release heat at low room temperature, thereby improving the thermal insulation and heat preservation performance of the thermal insulation filler. Melamine and formaldehyde react to form an organic polymer film layer coated on the surface of the thermal insulation filler, which can reduce the surface energy of the thermal insulation filler, improve its dispersion uniformity, and avoid the problem that the silica aerogel thermal insulation filler is easy to agglomerate and difficult to disperse uniformly in the slurry due to its three-dimensional porous structure.

[0053] In some implementations of the present invention, S200 specifically includes:

[0054] S210, uniformly mixing tetrabutyl phosphine hydroxide, calcium hydroxide and magnesium acetate in water to obtain a first treating agent;

[0055] S220, mixing the heat insulating filler and calcium carbonate in the first treatment agent uniformly and soaking them for 15 to 20 minutes to complete the compatibility modification treatment;

[0056] S230, filtering the solids and drying them to obtain a first mixture.

[0057] Preferably, in S210, the mass ratio of tetrabutylphosphine hydroxide:calcium hydroxide:magnesium acetate:water=(0.1-0.2):(0.12-0.16):(1.5-2):100.

[0058] Preferably, in S220, the mass ratio of thermal insulation filler: calcium carbonate: first treatment agent = (4-6): (50-60): 100.

[0059] Preferably, in S210, tetrabutyl phosphine hydroxide, calcium hydroxide and magnesium acetate are uniformly mixed in water in the order of adding calcium hydroxide first, and then adding tetrabutyl phosphine hydroxide and magnesium acetate.

[0060] Preferably, in S220, the thermal insulation filler and calcium carbonate are first mixed evenly, and then placed together in the first treatment agent and stirred, so that the thermal insulation filler and calcium carbonate are mixed evenly in the first treatment agent.

[0061] By configuring a first treatment agent and immersing the thermal insulation filler and calcium carbonate in the first treatment agent, the first treatment agent can be used to change the charge state and interface properties of the surface of the thermal insulation filler and calcium carbonate particles, thereby improving the compatibility between the thermal insulation filler and calcium carbonate, reducing the surface energy of the valve, and thus avoiding or reducing the cracking and falling off of the putty powder.

[0062] In some embodiments of the present invention, in S300, the auxiliary materials include: film former, dispersant, thickener, redispersible latex powder, talcum powder, and white cement. Among them, S300 specifically includes:

[0063] According to the mass ratio of film former: dispersant: thickener: redispersible latex powder: talcum powder: white cement: first mixture = (0.4-0.6): (0.4-0.6): (0.5-1): (2-3): (4-6): (18-20): 100, the first mixture and auxiliary materials are mixed evenly to obtain interior wall putty powder. Among them, the film former is styrene resin, polyurethane resin, ethylene glycol, and methyl cellulose, which are mixed and evenly mixed according to the weight ratio of 15:10:5:0.2; the dispersant is sodium lauryl sulfate, and the thickener is hydroxypropyl methyl cellulose ether.

[0064] Example 1

[0065] The present embodiment provides a method for preparing interior wall putty powder, the preparation method comprising:

[0066] S1. Ultrasonic dispersion of titanium dioxide in a mixture of water and ethanol at a mass ratio of titanium dioxide: water: ethanol = 0.6:30:100 to obtain a titanium dioxide suspension;

[0067] S2, according to the mass ratio of silicon tetrachloride: ethanol = 6:100, according to the amount of ethanol added in S1, silicon tetrachloride is added dropwise to the titanium dioxide suspension and stirred simultaneously, after the addition is completed, citric acid is added to adjust the pH value to 3-4 and continue stirring for 2 hours to obtain a silicon dioxide hydrolyzate containing titanium dioxide;

[0068] S3, adding 4 wt % sodium hydroxide aqueous solution to the silica hydrolyzate at a mass ratio of sodium hydroxide to silica hydrolyzate = 2:100, mixing well and standing for 2 h to obtain a silica sol containing titanium dioxide;

[0069] S5, soaking the silica sol in ethanol and aging it for 20 hours, taking it out and sending it to a vacuum reactor, introducing ethanol vapor into the reactor, heating and pressurizing it, keeping it warm and pressurized for 2 hours at a temperature of 247° C. to 250° C. and a pressure of 6.6 MPa to 6.8 MPa, then cooling and releasing the pressure to obtain a thermal insulation filler;

[0070] S6. According to the mass ratio of Tween 60: n-octadecane: paraffin: thermal insulation filler: vegetable oil = 0.3:4:4:50:100, Tween 60, n-octadecane, paraffin and thermal insulation filler are mixed in the vegetable oil, heated to 55° C., and ultrasonically emulsified to obtain an oil phase emulsion containing the thermal insulation filler;

[0071] S7, mixing melamine, 45 wt % formaldehyde aqueous solution and water in a mass ratio of melamine: formaldehyde solution: water = 50:100:100, adjusting the pH value to neutral, heating to 60° C. and stirring and mixing until viscous, to obtain a wall material solution;

[0072] S8, heating the oil phase emulsion to 60°C, adding the wall material solution dropwise thereto and stirring simultaneously, allowing the reaction to stand for 1.5 hours after the addition is completed, cooling naturally and adjusting the pH value to neutral, adding urea to remove residual formaldehyde, filtering, washing twice with a mixture of 60°C 1:1 ethanol and water, and drying to obtain a post-treated thermal insulation filler;

[0073] S9, according to the mass ratio of tetrabutyl phosphine hydroxide: calcium hydroxide: magnesium acetate: water = 0.1:0.15:1.5:100, in the order of adding calcium hydroxide first, then adding tetrabutyl phosphine hydroxide and magnesium acetate, tetrabutyl phosphine hydroxide, calcium hydroxide and magnesium acetate are uniformly mixed in water to obtain a first treatment agent;

[0074] S10, in a mass ratio of thermal insulation filler: calcium carbonate: first treatment agent = 6:60:100, the thermal insulation filler obtained in S8 and calcium carbonate are first mixed evenly, and then placed together in the first treatment agent and stirred, and the thermal insulation filler and calcium carbonate are mixed evenly in the first treatment agent and soaked for 15 minutes to complete the compatibility modification treatment, and the solids are filtered and dried to obtain a first mixture;

[0075] S11, mixing the materials into a film according to the mass ratio of styrene resin: polyurethane resin: ethylene glycol: methyl cellulose = 15:10:5:0.2;

[0076] S12. Evenly mix the first mixture and the above auxiliary materials according to the mass ratio of film-forming agent: sodium lauryl sulfate: hydroxypropyl methylcellulose ether: redispersible latex powder: talcum powder: white cement: first mixture = 0.4:0.4:1:2:4:18:100 to obtain interior wall putty powder.

[0077] Example 2

[0078] The present embodiment provides a method for preparing interior wall putty powder, the preparation method comprising:

[0079] S1. Ultrasonic dispersion of titanium dioxide in a mixture of water and ethanol at a mass ratio of titanium dioxide: water: ethanol = 0.6:30:100 to obtain a titanium dioxide suspension;

[0080] S2, according to the mass ratio of silicon tetrachloride: ethanol = 6:100, according to the amount of ethanol added in S1, silicon tetrachloride is added dropwise to the titanium dioxide suspension and stirred simultaneously, after the addition is completed, citric acid is added to adjust the pH value to 3-4 and continue stirring for 2 hours to obtain a silicon dioxide hydrolyzate containing titanium dioxide;

[0081] S3, adding 4 wt % sodium hydroxide aqueous solution to the silica hydrolyzate at a mass ratio of sodium hydroxide to silica hydrolyzate = 2:100, mixing well and standing for 2 h to obtain a silica sol containing titanium dioxide;

[0082] S5, soaking the silica sol in ethanol and aging it for 20 hours, taking it out and sending it to a vacuum reactor, introducing ethanol vapor into the reactor, heating and pressurizing it, keeping it warm and pressurized for 2 hours at a temperature of 247° C. to 250° C. and a pressure of 6.6 MPa to 6.8 MPa, then cooling and releasing the pressure to obtain a thermal insulation filler;

[0083] S6. According to the mass ratio of tetrabutyl phosphine hydroxide: calcium hydroxide: magnesium acetate: water = 0.1:0.15:1.5:100, calcium hydroxide is added first, and then tetrabutyl phosphine hydroxide and magnesium acetate are added, and tetrabutyl phosphine hydroxide, calcium hydroxide and magnesium acetate are mixed in water to obtain a first treatment agent;

[0084] S7, in a mass ratio of thermal insulation filler: calcium carbonate: first treatment agent = 6:60:100, the thermal insulation filler of S5 and calcium carbonate are first mixed evenly, and then placed together in the first treatment agent and stirred, the thermal insulation filler and calcium carbonate are mixed evenly in the first treatment agent and soaked for 15 minutes to complete the compatibility modification treatment, and the solids are filtered and dried to obtain a first mixture;

[0085] S8. Mix the materials according to the mass ratio of styrene resin: polyurethane resin: ethylene glycol: methyl cellulose = 15:10:5:0.2 to prepare a film;

[0086] S9. Evenly mix the first mixture and the above auxiliary materials according to the mass ratio of film-forming agent: sodium lauryl sulfate: hydroxypropyl methylcellulose ether: redispersible latex powder: talcum powder: white cement: first mixture = 0.4:0.4:1:2:4:18:100 to obtain interior wall putty powder.

[0087] Example 3

[0088] The present embodiment provides a method for preparing interior wall putty powder, the preparation method comprising:

[0089] S1. Ultrasonic dispersion of titanium dioxide in a mixture of water and ethanol at a mass ratio of titanium dioxide: water: ethanol = 0.6:30:100 to obtain a titanium dioxide suspension;

[0090] S2, according to the mass ratio of silicon tetrachloride: ethanol = 6:100, according to the amount of ethanol added in S1, silicon tetrachloride is added dropwise to the titanium dioxide suspension and stirred simultaneously, after the addition is completed, citric acid is added to adjust the pH value to 3-4 and continue stirring for 2 hours to obtain a silicon dioxide hydrolyzate containing titanium dioxide;

[0091] S3, adding 4 wt % sodium hydroxide aqueous solution to the silica hydrolyzate at a mass ratio of sodium hydroxide to silica hydrolyzate = 2:100, mixing well and standing for 2 h to obtain a silica sol containing titanium dioxide;

[0092] S5, soaking the silica sol in ethanol and aging it for 20 hours, taking it out and sending it to a vacuum reactor, introducing ethanol vapor into the reactor, heating and pressurizing it, keeping it warm and pressurized for 2 hours at a temperature of 247° C. to 250° C. and a pressure of 6.6 MPa to 6.8 MPa, then cooling and releasing the pressure to obtain a thermal insulation filler;

[0093] S6, mixing the thermal insulation filler of S5 and calcium carbonate evenly according to the mass ratio of thermal insulation filler: calcium carbonate = 1:10:100 to obtain a first mixture;

[0094] S7, mixing the materials into a film according to the mass ratio of styrene resin: polyurethane resin: ethylene glycol: methyl cellulose = 15:10:5:0.2;

[0095] S8. Evenly mix the first mixture and the above auxiliary materials according to the mass ratio of film-forming agent: sodium lauryl sulfate: hydroxypropyl methylcellulose ether: redispersible latex powder: talcum powder: white cement: first mixture = 0.4:0.4:1:2:4:18:100 to obtain interior wall putty powder.

[0096] Performance Testing

[0097] The putty powders of Examples 1-3 were taken as samples, and the initial drying anti-cracking performance of the samples was tested using a CGK-2 initial drying anti-cracking tester in accordance with GB / T9779-2015. The test results are shown in Table 1.

[0098] Table 1

[0099] Serial number Initial drying crack resistance (6h) Dynamic crack resistance / mm Example 1 1mm no crack 0.25 Example 2 1mm no crack 0.18 Example 3 1mm no crack 0.09

[0100] The putty powders of Examples 1-3 were taken, and the thermal conductivity was tested using a laser thermal conductivity analyzer at room temperature of 35° C. The thermal conductivity of the putty powders of Examples 1-3 were 0.031 W / (MK), 0.037 W / (MK), and 0.038 W / (MK), respectively.

[0101] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A method for preparing interior wall putty powder, characterized in that: The preparation method comprises: S100, preparing a post-treated thermal insulation filler; S200, mixing the post-treated thermal insulation filler and calcium carbonate, and performing compatibility modification treatment to obtain a first mixture; S300, uniformly mixing the first mixture and auxiliary materials to obtain the interior wall putty powder; In S300, the auxiliary materials include: film former, dispersant, thickener, redispersible latex powder, talcum powder, white cement; the mass ratio of film former: dispersant: thickener: redispersible latex powder: talcum powder: white cement: the first mixture is (0.4-0.6): (0.4-0.6): (0.5-1): (2-3): (4-6): (18-20): 100; the film former is made of styrene resin, polyurethane resin, ethylene glycol, and methyl cellulose, which are mixed and uniformly mixed in a weight ratio of 15:10:5:0.2; Among them, S100 specifically includes: S110, ultrasonically dispersing titanium dioxide in a mixture of water and ethanol to obtain a titanium dioxide suspension; S120, adding silicon tetrachloride dropwise to the titanium dioxide suspension while stirring simultaneously, adding citric acid after the addition is complete to adjust the pH value to 3-4 and continue stirring for 2 h to 2.5 h to obtain a silicon dioxide hydrolyzate containing titanium dioxide; S130, adding sodium hydroxide to the silicon dioxide hydrolyzate, mixing evenly and standing for 1.5 to 2 hours to obtain a silicon dioxide sol containing titanium dioxide; S140, soaking the silica sol in ethanol and aging it for 18 to 20 hours, taking it out and performing supercritical drying to obtain the thermal insulation filler; After S140, the thermal insulation filler is post-processed through the following steps: S151. Tween 60, n-octadecane, paraffin, and thermal insulation filler are mixed in vegetable oil in a mass ratio of Tween 60: n-octadecane: paraffin: thermal insulation filler: vegetable oil = (0.2-0.4): (2-4): (3-5): (40-50): 100, heated to 45° C.-55° C., and ultrasonically emulsified to obtain an oil phase emulsion containing the thermal insulation filler; S152, mixing melamine, 45 wt % formaldehyde aqueous solution and water in a mass ratio of melamine: formaldehyde solution: water = (45-55): 100: 100, adjusting the pH value to neutral, heating to 55° C.-65° C. and stirring and mixing until viscous, to obtain a wall material solution; S153, heating the oil phase emulsion to 55°C-65°C, adding the wall material solution dropwise thereto and stirring simultaneously, allowing the reaction to stand for 1.5 to 2 hours after the addition is completed, cooling naturally and adjusting the pH value to neutral, adding urea to remove residual formaldehyde, filtering and washing with a mixture of ethanol and water above 60°C for 2-3 times, and drying to obtain a post-treated thermal insulation filler; S200 specifically includes: S210, uniformly mixing tetrabutyl phosphine hydroxide, calcium hydroxide and magnesium acetate in water to obtain a first treating agent; S220, mixing the post-treated thermal insulation filler and the calcium carbonate in the first treatment agent evenly and soaking them for 15 to 20 minutes to complete the compatibility modification treatment; S230, filtering the solids and drying them to obtain the first mixture.

2. The preparation method according to claim 1, characterized in that: In S110, by mass ratio, titanium dioxide: water: ethanol = (0.5-1): (30-32): 100; In S120, according to the amount of ethanol added in S110, the silicon tetrachloride is added dropwise to the titanium dioxide suspension, and the mass ratio is silicon tetrachloride:ethanol=(4-6):100; In S130, the mass ratio of sodium hydroxide to silicon dioxide hydrolyzate is (2-4):

100.

3. The preparation method according to claim 1, characterized in that: In S210, by mass ratio, tetrabutyl phosphine hydroxide: calcium hydroxide: magnesium acetate: water = (0.1-0.2): (0.12-0.16): (1.5-2): 100; In S220, the mass ratio of the post-treated thermal insulation filler: calcium carbonate: first treatment agent is (4-6): (50-60):

100.

4. The preparation method according to claim 1, characterized in that: In S210, the tetrabutyl phosphine hydroxide, the calcium hydroxide and the magnesium acetate are uniformly mixed in water in the order of first adding the calcium hydroxide and then adding the tetrabutyl phosphine hydroxide and the magnesium acetate.

5. The preparation method according to claim 2, characterized in that: In S220, the post-treated thermal insulation filler and the calcium carbonate are first mixed evenly, and then placed together in the first treatment agent and stirred to mix the post-treated thermal insulation filler and the calcium carbonate evenly in the first treatment agent.

6. The preparation method according to claim 1, characterized in that: The dispersant is sodium lauryl sulfate, and the thickener is hydroxypropyl methylcellulose ether.

7. An interior wall putty powder, characterized in that: The interior wall putty powder is obtained by the preparation method according to any one of claims 1 to 6.