Self-lost foam volcanic effect coating and preparation method thereof

Abstract

The invention relates to the technical field of building coatings, and discloses a self-evanescent mode volcanic effect coating which is formed by mixing 5 wt% of sodium alginate gel and 95 wt% of sand latex paint. The sodium alginate gel is prepared by dropping a sodium alginate aqueous solution into a calcium chloride aqueous solution by using droppers with different pore diameters according to the frequency of two drops per second; the sodium alginate aqueous solution is prepared from 0.5 to 3 weight percent of sodium alginate, 0.3 weight percent of bactericide and 99.2 to 96.7 weight percent of water; the calcium chloride aqueous solution is prepared from 0.5 to 3 weight percent of anhydrous calcium chloride and 99.5 to 97 weight percent of water. The sodium alginate gel is prepared from the sodium alginate solution and the calcium chloride solution, cavities are formed after a paint film is dried by utilizing the self-disappearance property that the hydrogel is low in solid content and almost free of residues after being dried, the purpose of manufacturing honeycomb holes is achieved, and the paint film effect of self-disappearance mold pore forming can be basically reproduced due to the fact that the size of the hydrogel is controllable.

Description

Technical Field

[0001] This invention relates to the field of architectural coatings technology, specifically to a self-lost foam volcanic rock effect coating and its preparation method. Background Technology

[0002] With the continuous expansion of the artistic paint market, the introduction and development of more products is imperative. Travertine paint is an artistic paint that imitates the effect of natural volcanic rock, featuring a honeycomb-like porous effect, a three-dimensional shape, and a simple yet sophisticated look. Creating an aesthetically pleasing honeycomb-like porous effect is key to the development of travertine paint.

[0003] The main methods for creating honeycomb pores in existing travertine coatings include: on-site foaming, textured surface application, or spraying colored dots to simulate a honeycomb effect. Both on-site foaming and textured surface application methods suffer from cumbersome construction processes, random pore results, uncontrollable pore size, and difficulty in replicating the paint film effect. Chinese patent CN117703038A discloses a coating application method for multi-colored travertine decoration, which uses a textured surface application process to create pores. This requires on-site construction, resulting in inconsistent pore sizes and random effects with each application, making the decorative effect almost impossible to reproduce. Chinese patent CN215211991U discloses an exterior wall coating structure that imitates the travertine effect, using sprayed colored dots to simulate pores. However, these are not real pores, and their texture and realism are insufficient.

[0004] Based on this, the present invention aims to develop a volcanic rock effect coating and its preparation method that utilizes the self-disappearing properties of molds to easily create realistic honeycomb pores with controllable pore size. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a self-disappearing foam volcanic rock effect coating and its preparation method. This invention uses sodium alginate solution and calcium chloride solution to manufacture sodium alginate gel. Utilizing the low solids content of the hydrogel and its self-disappearing property (leaving almost no residue after drying), cavities are formed after the paint film dries, achieving the purpose of creating a porous honeycomb structure. This invention greatly simplifies the construction process, and because the size of the hydrogel is controllable, the pore-forming effect of the self-disappearing foam coating can be largely reproduced.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A self-loosening foam volcanic rock effect coating is formed by mixing 5 wt% sodium alginate gel and 95 wt% sand-based paint. The sodium alginate gel is prepared by dripping an aqueous solution of sodium alginate into an aqueous solution of calcium chloride at a frequency of two drops per second using droppers with different apertures. The aqueous solution of sodium alginate is prepared by mixing 0.5-3 wt% sodium alginate, 0.3 wt% bactericide, and 99.2-96.7 wt% water. The aqueous solution of calcium chloride is prepared by mixing 0.5-3 wt% anhydrous calcium chloride and 99.5-97 wt% water.

[0007] Preferably, the sodium alginate, CAS: 9005-38-3, is selected from Aladdin.

[0008] Preferably, the anhydrous calcium chloride, CAS: 10043-52-4, is selected from Xilong Scientific.

[0009] Preferably, the bactericide is composed of 5% MIT and 5% BIT, selected from THOR MBS 5050.

[0010] Preferably, the sand-coated paint is selected from Nippon Milano Microcrystalline Stone Effect Paint, Nippon Milano Ceramic Sand Effect Paint, or Nippon Magic Paint Natural Zeolite.

[0011] Another object of the present invention is to disclose a method for preparing the above-mentioned self-loosening foam volcanic rock effect coating, comprising the following steps: (1) Sodium alginate, bactericide and water are mixed evenly to prepare sodium alginate aqueous solution; Anhydrous calcium chloride and water are mixed evenly to prepare calcium chloride aqueous solution; (2) Sodium alginate aqueous solution was added to calcium chloride aqueous solution at a frequency of two drops per second using droppers of different aperture sizes to prepare sodium alginate gel, i.e., a self-loosening molding process; (3) Mix sodium alginate gel and sand paint evenly. It can be applied by trowel or roller. After the paint film dries, it shrinks due to the disappearing mold and forms cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention uses sodium alginate solution and calcium chloride solution to create sodium alginate gel as a self-disappearing foam. Utilizing the low solids content and near-zero residue after drying, the gel forms cavities after the paint film dries, achieving the purpose of creating honeycomb-like pores. This pore-creating method is simple and convenient, significantly saving construction time, and allows for free control of the pore size in the paint film, thus standardizing the paint film effect.

[0013] This invention greatly simplifies the construction process, and because the size of the hydrogel can be controlled, the paint film effect of self-lost foam pore-forming can be basically reproduced. It solves the problem that conventional pore coatings require on-site pore-forming, the pore size is inconsistent, and the effect is different for each construction.

[0014] This invention is easy to use. Simply mix sodium alginate gel with sand-based paint, apply it to the wall with a trowel or roller, and after the paint film dries, it will present a natural volcanic rock effect. This solves the shortcomings of existing volcanic rock effect paints, which require on-site drilling and have a cumbersome construction process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of sodium alginate gel prepared by adding 0.5-3wt% sodium alginate aqueous solution to 0.5-3wt% calcium chloride aqueous solution. Figure 2 yes Figure 1 A schematic diagram of sodium alginate gel after drying; Figure 3 This is a schematic diagram of the paint film after the coating prepared in Example 1 has dried after application; Figure 4 This is a comparative schematic diagram of the agglomerated particles obtained in Example 1 and the paint film after the coating is applied and dried. Figure 5 These are schematic diagrams comparing the different particle sizes of agglomerated particles in Examples 7 (left), 8 (middle), and 9 (right) with the paint film after the coating has dried. Figure 6 This is a schematic diagram showing the hydrogel particles broken into powder after the coatings prepared in Comparative Examples 1-4 are washed and sieved. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0017] This invention discloses a self-loosening foam volcanic rock effect coating, which is formed by mixing 5 wt% sodium alginate gel and 95 wt% sand-based paint. The sodium alginate gel is prepared by dripping an aqueous solution of sodium alginate into an aqueous solution of calcium chloride at a frequency of two drops per second using droppers with different apertures. The aqueous solution of sodium alginate is prepared by mixing 0.5-3 wt% sodium alginate, 0.3 wt% bactericide, and 99.2-96.7 wt% water. The aqueous solution of calcium chloride is prepared by mixing 0.5-3 wt% anhydrous calcium chloride and 99.5-97 wt% water.

[0018] Sodium alginate, CAS: 9005-38-3, selected from Aladdin. Anhydrous calcium chloride, CAS: 10043-52-4, selected from Xilong Scientific. Bactericide, active ingredients are 5% MIT and 5% BIT, selected from THOR MBS 5050. Sand-textured paint selected from Nippon Milano Microcrystalline Stone Effect Paint, Nippon Milano Ceramic Sand Effect Paint, or Nippon Magic Paint Natural Zeolite.

[0019] The preparation method of the above-mentioned self-lost foam volcanic rock effect coating includes the following steps: (1) Sodium alginate, bactericide and water are mixed evenly to prepare sodium alginate aqueous solution; Anhydrous calcium chloride and water are mixed evenly to prepare calcium chloride aqueous solution; (2) Sodium alginate aqueous solution was added to calcium chloride aqueous solution at a frequency of two drops per second using droppers of different aperture sizes to prepare sodium alginate gel, i.e., a self-loosening molding process; (3) Mix sodium alginate gel and sand paint evenly. It can be applied by trowel or roller. After the paint film dries, it shrinks due to the disappearing mold and forms cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0020] Preparation of sodium alginate gel (self-lost molding): Add 0.5-3wt% sodium alginate, 0.3wt% bactericide, and 99.2-96.7wt% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 0.5-3wt% sodium alginate aqueous solution.

[0021] Add 0.5-3wt% calcium chloride and 99.5-97wt% water to a container, then place it under an experimental disperser and disperse it for 10 min at a speed of 300 r / min to obtain a 0.5-3wt% calcium chloride aqueous solution.

[0022] Sodium alginate aqueous solution was added to calcium chloride aqueous solution at a rate of two drops per second using a dropper to prepare sodium alginate gel, which is a self-loosening molding process.

[0023] Figure 1 This is a schematic diagram of sodium alginate gel prepared by adding 0.5-3wt% sodium alginate aqueous solution to 0.5-3wt% calcium chloride aqueous solution.

[0024] from Figure 1 As can be seen, the shape of the lost foam mold prepared by the 3wt% sodium alginate aqueous solution is not round enough.

[0025] Each Figure 1The sodium alginate gel prepared in the process was mixed with Nippon Milano microcrystalline stone effect paint and dispersed at 1500 r / min for 10 min. The self-lost foam pattern prepared with 0.5 wt% sodium alginate aqueous solution had a relatively loose structure and showed signs of damage, while the self-lost foam patterns prepared with 1 wt% and 2 wt% sodium alginate aqueous solutions remained rounded.

[0026] In conclusion, Figure 1 The self-lost foam structure in frame A is compact and rounded, which meets the requirements for hole creation.

[0027] Figure 2 yes Figure 1 A schematic diagram of the dried sodium alginate gel. (From...) Figure 2 As can be seen, the four types of self-disappearing molds in box B maintain a rounded shape regardless of whether they are in hydrogel form or after drying, which meets the requirements.

[0028] The present invention will be further illustrated below through Examples 1-9 and Comparative Examples 1-4.

[0029] Example 1 (All values ​​in this example are mass percentages, and the same applies below) Add 1% sodium alginate, 0.3% bactericide, and 98.7% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 1% sodium alginate aqueous solution.

[0030] Add 1% calcium chloride and 99% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 1% calcium chloride aqueous solution.

[0031] Sodium alginate gel particles were prepared by adding 1% sodium alginate aqueous solution to 1% calcium chloride aqueous solution at a rate of two drops per second using a dropper, which is a self-loosening molding process.

[0032] When using, mix the disappearing mold with Nippon Milano microcrystalline stone effect paint at a ratio of 5%:95%, then place it under a test disperser and disperse at 1000 rpm for 10 minutes. Apply to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the paint film surface, thus creating a volcanic rock effect. Figure 3 As shown.

[0033] Figure 4 This is a comparative schematic diagram of the hydrogel particles prepared in Example 1 and the paint film after drying. The particle size of the hydrogel particles is 2-3 mm.

[0034] Example 2 Add 2% sodium alginate, 0.3% bactericide, and 97.7% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 2% sodium alginate aqueous solution.

[0035] Add 1% calcium chloride and 99% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 1% calcium chloride aqueous solution.

[0036] Sodium alginate hydrogel particles were prepared by adding 2% sodium alginate aqueous solution to 1% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process is known as self-loosening molding.

[0037] When using, mix the disappearing mold with Nippon Milano microcrystalline stone effect paint at a ratio of 5%:95%, then place it under a test disperser and disperse it at 1000r / min for 10 minutes. Apply it to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0038] Example 3 Add 1% sodium alginate, 0.3% bactericide, and 98.7% water to a container, then place it under an experimental disperser and disperse it for 10 min at a speed of 750 r / min to obtain a 1% sodium alginate aqueous solution.

[0039] Add 2% calcium chloride and 98% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 2% calcium chloride aqueous solution.

[0040] Sodium alginate hydrogel particles were prepared by adding 1% sodium alginate aqueous solution to 2% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process is known as self-loosening molding.

[0041] When using, mix the disappearing mold with Nippon Milano microcrystalline stone effect paint at a ratio of 5%:95%, then place it under an experimental disperser and disperse it at 1000r / min for 10 minutes. Apply it to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0042] Example 4 Add 2% sodium alginate, 0.3% bactericide, and 97.7% water to a container, then place it under an experimental disperser and disperse it for 10 min at a speed of 750 r / min to obtain a 2% sodium alginate aqueous solution.

[0043] Add 2% calcium chloride and 98% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 2% calcium chloride aqueous solution.

[0044] Sodium alginate hydrogel particles were prepared by dripping a 2% sodium alginate aqueous solution into a 2% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process resulted in a self-loosening foam.

[0045] When using, mix the disappearing mold with Nippon Milano microcrystalline stone effect paint at a ratio of 5%:95%, then place it under an experimental disperser and disperse it at 1000r / min for 10 minutes. Apply it to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0046] Example 5 Add 1% sodium alginate, 0.3% bactericide, and 98.7% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 1% sodium alginate aqueous solution.

[0047] Add 1% calcium chloride and 99% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 1% calcium chloride aqueous solution.

[0048] Sodium alginate hydrogel particles were prepared by adding 1% sodium alginate aqueous solution to 1% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process is known as self-loosening molding.

[0049] When using, mix the disappearing mold with Nippon Milano Ceramic Sand Effect Paint at a ratio of 5%:95%, then place it under a test disperser and disperse it at 1000r / min for 10 minutes. Apply it to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the paint film surface, thus presenting a volcanic rock effect.

[0050] Example 6 Add 1% sodium alginate, 0.3% bactericide, and 98.7% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 1% sodium alginate aqueous solution.

[0051] Add 1% calcium chloride and 99% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 1% calcium chloride aqueous solution.

[0052] Sodium alginate hydrogel particles were prepared by adding 1% sodium alginate aqueous solution to 1% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process is known as self-loosening molding.

[0053] When using, mix the disappearing mold with Nippon Magic Paint natural zeolite in a ratio of 5%:95%, then place it under an experimental disperser and disperse it at 1000r / min for 10 minutes. Apply it to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0054] The agglomerated particles obtained in Examples 2-6 are basically the same size as those obtained in Example 1, and there is no significant difference in the paint film effect. Figure 4 similar.

[0055] Tests showed that the coatings prepared in Examples 1-6 could all produce a good volcanic rock effect.

[0056] Example 7 Add 1% sodium alginate, 0.3% bactericide, and 98.7% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 1% sodium alginate aqueous solution.

[0057] Add 1% calcium chloride and 99% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 1% calcium chloride aqueous solution.

[0058] Sodium alginate hydrogel particles were prepared by dripping a 1% sodium alginate aqueous solution into a 1% calcium chloride aqueous solution at a rate of two drops per second using a 0.5mm syringe, which is a self-loosening molding process.

[0059] When using, mix the disappearing mold with Nippon Magic Paint natural zeolite in a ratio of 5%:95%, then place it under an experimental disperser and disperse it at 1000r / min for 10 minutes. Apply it to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0060] Example 8 Add 1% sodium alginate, 0.3% bactericide, and 98.7% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 1% sodium alginate aqueous solution.

[0061] Add 1% calcium chloride and 99% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 1% calcium chloride aqueous solution.

[0062] Sodium alginate hydrogel particles were prepared by dripping a 1% sodium alginate aqueous solution into a 1% calcium chloride aqueous solution at a rate of two drops per second using a 3mm dropper. This process is known as self-loosening molding.

[0063] When using, mix the disappearing mold with Nippon Magic Paint natural zeolite in a ratio of 5%:95%, then place it under an experimental disperser and disperse it at 1000r / min for 10 minutes. Apply it to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0064] Example 9 Add 1% sodium alginate, 0.3% bactericide, and 98.7% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 1% sodium alginate aqueous solution.

[0065] Add 1% calcium chloride and 99% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 1% calcium chloride aqueous solution.

[0066] Sodium alginate hydrogel particles were prepared by dripping a 1% sodium alginate aqueous solution into a 1% calcium chloride aqueous solution at a rate of two drops per second using a 5mm dropper (after cutting the dropper). This process resulted in a self-loosening molding process.

[0067] When using, mix the disappearing mold with Nippon Magic Paint natural zeolite in a ratio of 5%:95%, then place it under an experimental disperser and disperse it at 1000r / min for 10 minutes. Apply it to the wall and wait for the paint film to dry. The disappearing mold will shrink (almost invisible to the naked eye) and form cavities on the surface of the paint film, thus presenting a volcanic rock effect.

[0068] Examples 7-9 show gel particles of different sizes manufactured using droppers with different pore sizes. Figure 5 These are schematic diagrams comparing the different particle sizes of agglomerated particles in Examples 7 (left), 8 (middle), and 9 (right) with the paint film after the coating has dried.

[0069] The following table shows the different particle sizes of gel particles and the particle sizes of the pores they created in Examples 1-9:

[0070] The particle size distribution of the hydrogel and the size of the pores formed are within a similar particle size range. By using droppers with different pore sizes when manufacturing the hydrogel, the size of the hydrogel can be controlled, thereby indirectly controlling the size of the pores in the paint film.

[0071] Comparative Example 1 Add 0.5% sodium alginate, 0.3% bactericide, and 99.2% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 0.5% sodium alginate aqueous solution.

[0072] Add 0.5% calcium chloride and 99.5% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 0.5% calcium chloride aqueous solution.

[0073] Sodium alginate hydrogel particles were prepared by adding 0.5% sodium alginate aqueous solution to 0.5% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process is known as self-loosening molding.

[0074] When using, mix the self-disappearing mold with Nippon Magic Paint natural zeolite in a ratio of 5%:95%, then place it under a laboratory disperser and disperse it at 1000r / min for 10 minutes before applying it to the wall.

[0075] Comparative Example 2 Add 0.5% sodium alginate, 0.3% bactericide, and 99.2% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 0.5% sodium alginate aqueous solution.

[0076] Add 1% calcium chloride and 99% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 1% calcium chloride aqueous solution.

[0077] Sodium alginate hydrogel particles were prepared by adding 0.5% sodium alginate aqueous solution to 1% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process is known as self-loosening molding.

[0078] When using, mix the self-disappearing mold with Nippon Magic Paint natural zeolite in a ratio of 5%:95%, then place it under a laboratory disperser and disperse it at 1000r / min for 10 minutes before applying it to the wall.

[0079] Comparative Example 3 Add 0.5% sodium alginate, 0.3% bactericide, and 99.2% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 750 r / min to obtain a 0.5% sodium alginate aqueous solution.

[0080] Add 2% calcium chloride and 98% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 2% calcium chloride aqueous solution.

[0081] Sodium alginate hydrogel particles were prepared by adding 0.5% sodium alginate aqueous solution to 2% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process is known as self-loosening molding.

[0082] When using, mix the self-disappearing mold with Nippon Magic Paint natural zeolite in a ratio of 5%:95%, then place it under a laboratory disperser and disperse it at 1000r / min for 10 minutes before applying it to the wall.

[0083] Comparative Example 4 Add 0.5% sodium alginate, 0.3% bactericide, and 99.2% water to a container, then place it under an experimental disperser and disperse it for 1 minute at a speed of 750 r / min to obtain a 0.5% sodium alginate aqueous solution.

[0084] Add 3% calcium chloride and 97% water to a container, then place it under an experimental disperser and disperse it for 10 minutes at a speed of 300 r / min to obtain a 3% calcium chloride aqueous solution.

[0085] Sodium alginate hydrogel particles were prepared by adding 0.5% sodium alginate aqueous solution to 3% calcium chloride aqueous solution at a rate of two drops per second using a dropper. This process is known as self-loosening molding.

[0086] When using, mix the self-disappearing mold with Nippon Magic Paint natural zeolite in a ratio of 5%:95%, then place it under a laboratory disperser and disperse it at 1000r / min for 10 minutes before applying it to the wall.

[0087] Figure 6 The images, from left to right, illustrate the breakdown of hydrogel particles into powder after washing and sieving the coatings obtained in Comparative Examples 1-4. After washing and sieving the mixed sand-gel paint, the hydrogel particles were found to be broken into powder. Testing showed that Comparative Examples 1-4 were almost unable to create a porous effect.

[0088] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A self-lost foam volcanic rock effect coating, characterized in that, It is formed by mixing 5 wt% sodium alginate gel and 95 wt% sand-based paint; the sodium alginate gel is prepared by dripping sodium alginate aqueous solution into calcium chloride aqueous solution at a frequency of two drops per second using droppers with different aperture sizes; the sodium alginate aqueous solution is prepared by mixing 0.5-3 wt% sodium alginate, 0.3 wt% bactericide and 99.2-96.7 wt% water; the calcium chloride aqueous solution is prepared by mixing 0.5-3 wt% anhydrous calcium chloride and 99.5-97 wt% water.

2. The self-lost foam volcanic rock effect coating according to claim 1, characterized in that, The sodium alginate, CAS: 9005-38-3, is selected from Aladdin.

3. The self-lost foam volcanic rock effect coating according to claim 1, characterized in that, The anhydrous calcium chloride, CAS: 10043-52-4, was selected from Xilong Scientific.

4. The self-lost foam volcanic rock effect coating according to claim 1, characterized in that, The bactericide contains 5% MIT and 5% BIT as active ingredients, selected from THOR MBS 5050.

5. The self-lost foam volcanic rock effect coating according to claim 1, characterized in that, The sand-like paint is selected from Nippon Milano Microcrystalline Stone Effect Paint, Nippon Milano Ceramic Sand Effect Paint, or Nippon Magic Paint Natural Zeolite.

6. The method for preparing a self-lost foam volcanic rock effect coating as described in any one of claims 1-5, characterized in that, Includes the following steps: (1) Sodium alginate, bactericide and water are mixed evenly to prepare sodium alginate aqueous solution; Anhydrous calcium chloride and water are mixed evenly to prepare calcium chloride aqueous solution; (2) Sodium alginate aqueous solution was added to calcium chloride aqueous solution at a frequency of two drops per second using droppers of different aperture sizes to prepare sodium alginate gel, i.e., a self-loosening molding process; (3) Mix sodium alginate gel and sand paint evenly. It can be applied by trowel or roller. After the paint film dries, it shrinks due to the disappearing mold and forms cavities on the surface of the paint film, thus presenting a volcanic rock effect.

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