Paint capable of stripping old coating of wall and preparation method of paint

Abstract

The invention provides a coating capable of stripping an old wall coating and a preparation method of the coating, and relates to the technical field of coatings. Specifically, the paint is prepared from the following raw materials in parts by weight: 5-15 parts of water, 0.5-2 parts of a dispersing agent, 0.1-0.5 part of a wetting agent, 0.5-1 part of a defoaming agent, 5-15 parts of titanium dioxide, 10-20 parts of calcined kaolin, 15-25 parts of heavy calcium carbonate, 15-35 parts of an emulsion, 1-3 parts of a cellulose aqueous solution, 0.1-0.5 part of a sodium hydroxide solution, 0.5-2 parts of a stabilizer, 10-20 parts of potassium silicate and 0.1-0.5 part of a thickening agent. The preparation method comprises the following steps: sequentially stirring, mixing and filtering the raw materials. After the coating is cured on the old wall surface, the coating on the old wall surface can be cracked together, and the coating on the old wall surface can be stripped. When the coating is used for stripping a coating layer of an old wall surface, the old wall surface does not need to be polished and knocked, the construction process is simple and pollution-free, and the coating on the old wall surface can be rapidly stripped.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a coating capable of stripping old wall coatings and a preparation method thereof. Background Art

[0002] In recent years, with the sudden rise of artistic paints and people's emphasis on wall decoration and demand for living atmosphere, more and more consumers have the need to renovate old walls.

[0003] At present, there are two main ways to renovate old walls on the market: the first is to directly cover the original wall coated with latex paint with artistic paint. Most of them will grind the original latex paint wall, then apply penetrating primer, and then apply artistic paint. The advantage of this method is that the construction is simple and fast, saving time and effort, but it will cause penetration difficulties due to the surface paint film, and the role of reinforcing the base material is very limited, or the bottom putty was not originally reinforced with penetrating primer, so it is more likely to crack and fall off in the later stage. The second method is to use tools such as impact drills to scrape off the old coating and putty layer, then scrape putty, apply penetrating primer, and then apply artistic paint. The advantage of this method is that it is reworked from bottom to top, and the possibility of cracking and falling off in the later stage is small, but it is time-consuming and labor-intensive to remove the wall paint film and the bottom putty, and the dust pollution and noise pollution are large, and the cost is high.

[0004] Based on this, it is extremely important to develop a water-based environmentally friendly coating that can strip off the old coating of wall latex paint, which can solve the problem of time-consuming and labor-intensive construction of removing the old coating during the renovation of old walls. Summary of the invention

[0005] The purpose of the present invention is to provide a coating with the function of stripping off old wall coatings. After the coating is solidified on the old wall surface, it can crack along with the coating on the old wall surface and strip off the coating on the old wall surface.

[0006] Another object of the present invention is to provide a method for preparing a coating capable of stripping off old wall coatings, wherein the preparation process is simple and the equipment requirements are low.

[0007] The present invention solves the technical problem by adopting the following technical solutions.

[0008] On the one hand, an embodiment of the present invention provides a coating having the function of stripping an old wall coating, comprising the following raw materials in parts by weight:

[0009] 5-15 parts of water, 0.5-2 parts of dispersants, 0.1-0.5 parts of wetting agents, 0.5-1 parts of defoamers, 5-15 parts of titanium dioxide, 10-20 parts of calcined kaolin, 15-25 parts of heavy calcium, 15-35 parts of emulsions, 1-3 parts of cellulose aqueous solution, 0.1-0.5 parts of sodium hydroxide solutions, 0.5-2 parts of stabilizers, 10-20 parts of potassium silicates and 0.1-0.5 parts of thickeners. In the present invention, the emulsion used is a high-strength penetration high-Tg emulsion, which can quickly penetrate and bond the old coating of the paint film to form a film, and then the internal stress of the film formed by the slow solidification of the high-strength penetration high-Tg emulsion and potassium silicate is large, forming tearing and cracking, and cracking together with the old coating film at the bottom layer and peeling off the putty at the bottom layer of the old coating, thereby achieving the purpose of peeling off the old coating of the wall. For old wall latex paint with high PVC coating, the paint film itself is loose and porous. High-strength penetrating high-Tg emulsion and potassium silicate penetrate into the interior of the paint film and the underlying putty layer, solidify into a film, crack, roll up and peel off, and after drying, it can be fallen off with a slight scraper. For old wall latex paint with low PVC coating, the paint film itself is relatively dense. High-strength penetrating high-Tg emulsion can penetrate, bond and rivet the old coating on the surface to form a film, and then crack and tear the old coating of the substrate through the high-strength penetrating high-Tg emulsion and potassium silicate curing film-forming process, so that the old coating also moves and cracks, and thus detaches from the wall.

[0010] In some embodiments of the present invention, the mass percentage of the cellulose aqueous solution is 5-15%, and the mass percentage of the sodium hydroxide solution is 5-15%.

[0011] In some embodiments of the present invention, the following raw materials are included by weight:

[0012] 10.45 parts of water, 1 part of dispersant, 0.2 parts of wetting agent, 0.6 parts of defoaming agent, 10 parts of titanium dioxide, 15 parts of calcined kaolin, 20 parts of weight, 30 parts of emulsion, 2 parts of cellulose aqueous solution, 0.25 parts of sodium hydroxide solution, 0.8 parts of stabilizer, 10 parts of potassium silicate and 0.2 parts of thickener.

[0013] In some embodiments of the present invention, the following raw materials are included by weight:

[0014] 9.55 parts of water, 1 part of dispersant, 0.2 parts of wetting agent, 0.6 parts of defoaming agent, 10 parts of titanium dioxide, 15 parts of calcined kaolin, 20 parts of heavy calcium, 20 parts of emulsion, 2 parts of cellulose aqueous solution, 0.25 parts of sodium hydroxide solution, 1.6 parts of stabilizer, 20 parts of potassium silicate and 0.3 parts of thickener.

[0015] On the other hand, an embodiment of the present invention provides a method for preparing a coating capable of stripping an old wall coating, comprising the following steps:

[0016] S1, mixing water, dispersant, wetting agent and defoamer, stirring evenly to obtain a mixed solution;

[0017] S2, then add titanium dioxide, calcined kaolin and heavy calcium in sequence and stir evenly;

[0018] S3, add water and emulsion and stir evenly;

[0019] S4, adding the cellulose aqueous solution and stirring evenly;

[0020] S5, then add sodium hydroxide solution and stabilizer in sequence and stir evenly;

[0021] S6, then add potassium silicate solution, defoamer and thickener in sequence, stir evenly, and filter to obtain the coating.

[0022] In some embodiments of the present invention, in step S1, the stirring speed is 300-400 r / min, and the stirring time is 3-5 min.

[0023] In some embodiments of the present invention, in step S2, the rotation speed of the stirring and dispersing is 1500-2000 r / min, and the stirring time is 20-30 min.

[0024] In some embodiments of the present invention, in step S6, filtering is performed using a 100-200 mesh filter.

[0025] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0026] The coating of the present invention comprises a high-strength penetrating emulsion and potassium silicate, and the emulsion can quickly penetrate into the old coating and bond with the old coating to form a film. The high-strength penetrating high-Tg emulsion and the slow solidification of the potassium silicate to form a film have a large internal stress and form tearing and cracking, and the bottom layer of the old coating film is cracked together with the putty of the bottom layer of the old coating film, thereby achieving the purpose of stripping the old coating of the wall. The coating of the present invention is used to strip the coating layer of the old wall surface, and there is no need to polish or knock the old wall surface. The construction process is simple and pollution-free, and the coating on the old wall surface can be quickly stripped. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a front view of the peeling state of the low PVC substrate in Example 1 of the present invention at 30°C;

[0029] Figure 2 This is a back view of the low PVC substrate in Example 1 of the present invention peeled off at 30°C;

[0030] Figure 3 This is a front view of the peeling state of the low PVC substrate in Example 1 of the present invention at 10°C;

[0031] Figure 4 This is a front view of the high PVC substrate in Example 1 of the present invention in a peeled state at 10°C;

[0032] Figure 5 This is a front view of the peeling state of the high PVC substrate in Example 1 of the present invention at 30°C;

[0033] Figure 6 This is a front view of the peeling state of the low PVC substrate in Comparative Example 4 of the present invention at 30°C; DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0036] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0037] Example 1

[0038] Prepare the raw materials according to the following ratio:

[0039] 9.95 parts of water, 1 part of dispersant, 0.2 parts of wetting agent, 0.6 parts of defoaming agent, 10 parts of titanium dioxide, 15 parts of calcined kaolin, 20 parts of heavy calcium, 30 parts of emulsion, 2 parts of cellulose aqueous solution, 0.25 parts of sodium hydroxide solution, 0.8 parts of stabilizer, 10 parts of potassium silicate and 0.2 parts of thickener.

[0040] Based on the above raw materials, the coating of this embodiment was prepared as follows:

[0041] S1, mix water (7.5 parts), dispersant, wetting agent, and defoamer (0.3 parts) at a stirring speed of 300 r / min, and stir for 3 minutes until the mixture is uniform;

[0042] S2, then slowly add titanium dioxide, calcined kaolin and heavy calcium in sequence, then adjust the speed to 1800r / min, and stir and disperse for 25min;

[0043] S3, reduce the speed to 800r / min, then slowly add water (2.45 parts) and emulsion, and stir for 3min until uniform;

[0044] S4, adding 10% by mass cellulose aqueous solution and stirring for 5 minutes until uniform;

[0045] S5, slowly add 10% sodium hydroxide solution, slowly add stabilizer, and stir for 5 minutes;

[0046] S6, then slowly add potassium silicate solution, defoamer (0.3 parts) and thickener in sequence, stir for 15 minutes until uniform, and filter with a 160-mesh filter to obtain the coating.

[0047] In this embodiment, the raw materials used are all purchased from the market, and the details are as follows:

[0048] The cellulose used was Ashland NATROSOL HE 3KB, the dispersant was Arkema P30, the wetting agent was DOW EH-9 wetting agent, the defoamer was BASF ST 2410AC, the pH adjuster was 10% sodium hydroxide solution from Shanghai Aladdin Biochemical Technology Co., Ltd., the titanium dioxide was SR-237 from Shandong Dongjia Group Co., Ltd., and the calcined kaolin was 80L Baixue Kaolin (Jersey). Heavy calcium carbonate, that is, heavy calcium carbonate, was used as the stabilizer, CS1 from Orun Chemical, K99A from Orun Chemical, and the emulsion, that is, high Tg high permeability emulsion, was Wanhua's 8223, the thickener used is RM-2020 rheological additive.

[0049] Example 2

[0050] Prepare the raw materials according to the following ratio:

[0051] 9.05 parts of water, 1 part of dispersant, 0.2 parts of wetting agent, 0.6 parts of defoaming agent, 10 parts of titanium dioxide, 15 parts of calcined kaolin, 20 parts of heavy calcium, 20 parts of emulsion, 2 parts of cellulose aqueous solution, 0.25 parts of sodium hydroxide solution, 1.6 parts of stabilizer, 20 parts of potassium silicate and 0.3 parts of thickener.

[0052] Based on the above raw materials, the coating of this embodiment was prepared as follows:

[0053] S1, mix water (7.5 parts), dispersant, wetting agent, and defoamer (0.3 parts) at a stirring speed of 300 r / min, and stir for 3 minutes until the mixture is uniform;

[0054] S2, then slowly add titanium dioxide, calcined kaolin and heavy calcium in sequence, then adjust the speed to 1800r / min, and stir and disperse for 25min;

[0055] S3, reduce the speed to 800r / min, then slowly add water (1.55 parts) and emulsion, and stir for 3min until uniform;

[0056] S4, adding 10% by mass cellulose aqueous solution and stirring for 5 minutes until uniform;

[0057] S5, slowly add 10% sodium hydroxide solution, slowly add stabilizer, and stir for 5 minutes;

[0058] S6, then slowly add potassium silicate solution, defoamer (0.3 parts) and thickener in sequence, stir for 15 minutes until uniform, and filter with a 160-mesh filter to obtain the coating.

[0059] The raw materials used in this embodiment are the same as those in Example 1.

[0060] Example 3

[0061] Prepare the raw materials according to the following ratio:

[0062] 15 parts of water, 2 parts of dispersant, 0.5 parts of wetting agent, 1 part of defoamer, 15 parts of titanium dioxide, 20 parts of calcined kaolin, 25 parts of heavy calcium, 35 parts of emulsion, 3 parts of cellulose aqueous solution, 0.5 parts of sodium hydroxide solution, 2 parts of stabilizer, 20 parts of potassium silicate and 0.5 parts of thickener.

[0063] The raw materials and preparation method used are the same as those in Example 1.

[0064] Example 4

[0065] Prepare the raw materials according to the following ratio:

[0066] 5 parts of water, 0.5 parts of dispersant, 0.1 parts of wetting agent, 0.5 parts of defoaming agent, 5 parts of titanium dioxide, 10 parts of calcined kaolin, 15 parts of heavy calcium, 15 parts of emulsion, 1 part of cellulose aqueous solution, 0.1 parts of sodium hydroxide solution, 0.5 parts of stabilizer, 10 parts of potassium silicate and 0.1 parts of thickener.

[0067] The raw materials and preparation method used are the same as those in Example 1.

[0068] Comparative Example 1

[0069] The difference from Example 1 is that in this comparative example, potassium silicate and stabilizer are not added, 10 parts of emulsion are used to replace potassium silicate, and the remaining raw material addition amounts and steps are the same as those in Example 1.

[0070] Comparative Example 2

[0071] The difference from Example 1 is that in this comparative example, no emulsion is added, 30 parts of potassium silicate is used instead of the emulsion, and the amount of stabilizer added is 3.2 parts. The remaining raw material addition amounts and steps are the same as those of Example 1.

[0072] Comparative Example 3

[0073] The difference from Example 1 is that in step S1 of this comparative example, 2 parts of film-forming aid are also added. The remaining raw material addition amounts and steps are the same as those of Example 1.

[0074] Comparative Example 4

[0075] The difference from Example 1 is that in this comparative example, the emulsion used is Wanhua high Tg emulsion 8068. The remaining raw material addition amounts and steps are the same as those in Example 1.

[0076] Comparative Example 5

[0077] The difference from Example 1 is that in this comparative example, no thickener is added, and the remaining raw material addition amounts and steps are the same as those in Example 1.

[0078] Experimental example

[0079] Test substrate preparation

[0080] 1. Production of high PVC latex paint substrate: Apply a layer of coarse putty on the calcium silicate board, apply fine putty to level it after it is completely dry, grind it to make it smooth and sweep away the dust after it is completely dry, apply a layer of Carpoly Quick-Easy Coating (diluted with 20% water) by roller, apply a second layer of putty after it is completely dry, and test it again 7 days after it is dry.

[0081] 2. Production of low PVC latex paint substrate: Similar to the production of high PVC latex paint substrate, the Speedy Paint is modified into the Chengbang hardcover 5-in-1 superior product.

[0082] Testing peeling performance

[0083] The prepared substrate was coated with the stripping paint of Examples 1-2 and Comparative Examples 1-5 by rolling, and dried naturally at 10°C and 30°C, respectively. Two days after it was completely dry, the stripping conditions were observed: cracked and rolled-up substrate with a putty layer, cracked surface paint film and partially rolled-up substrate, cracked surface paint film but unable to roll up substrate, film formation without cracking, etc.

[0084] Viscosity test

[0085] The viscosities of the stripping paints of Examples 1-2 and Comparative Examples 1-5 were tested using a Stormer viscometer at 25±1°C.

[0086] Storage test

[0087] The stripping paints (ie, coatings) of Examples 1-2 and Comparative Examples 1-5 were placed in cans and stored in an oven at 50° C. for 14 days. The state of the cans was observed for crusting, impurities, etc., and the viscosity of the stripping paints was tested.

[0088] Freeze-thaw test

[0089] The stripping paints of Examples 1-2 and Comparative Examples 1-5 were frozen at -7°C, thawed, and subjected to three freeze-thaw cycles. After thawing at room temperature for 24 hours, the flow state was observed to be normal. If the flow state was normal, the freeze-thaw stability test was passed and recorded as passed.

[0090] The test results are shown in Table 1.

[0091] Table 1 Stripping paint performance of Examples 1-2 and Comparative Examples 1-5

[0092]

[0093] From Table 1, it can be concluded that the stripping paints (coatings) of Examples 1 and 2 of the present invention, when applied on old walls with low, medium and high PVC latex paints, can well crack and roll up the base material to reveal the putty layer, and have a good stripping effect. Moreover, after being stored at 50° C. for 14 days, no foreign matter is generated, and the thermal storage stability is good.

[0094] Figure 1 This is a front view of the peeling state of the low PVC substrate in Example 1 at 30°C. It can be seen that the coating film has relatively uniform cracks, and a putty layer appears when the substrate is rolled up. The cracked layer can be peeled off from the wall by lightly scraping with a shovel.

[0095] Figure 3 This is a front view of the peeling state of the low PVC substrate in Example 1 at 10°C. The cracked and rolled-up substrate reveals a putty layer, which can be peeled off from the wall by lightly scraping with a shovel.

[0096] Figure 4 and Figure 5 The front view of the high PVC substrate in Example 1 at 10°C and 30°C peeling state shows that cracks appear and a putty layer appears when the substrate is rolled up. However, compared with the low PVC substrate ( Figure 1 and 3 ) As for the surface of high PVC substrate, it is loose and porous. It is mainly because the slow solidification of emulsion and potassium silicate into film has large internal stress and forms tearing and cracking, which cracks together with the underlying old coating and the putty underneath the old coating peels off, and its rolling effect is slightly poor.

[0097] In Comparative Example 1, potassium silicate was not added. Under the action of high Tg high penetration emulsion, the stripping effect on high PVC latex paint substrate was equivalent to that of Example 1-2. However, for low PVC latex paint, it could only be partially stripped at low temperature (10°C), and the stripping effect was poor, which could not achieve the purpose of stripping old walls.

[0098] In Comparative Example 2, no emulsion was added, and gelation occurred during repeated freezing and thawing, and the storage conditions could not be met, so the wall peeling effect was not considered.

[0099] In Comparative Example 3, a film-forming aid was added, but no cracking or curling of the base putty could occur, and a film was formed on the surface, which could not achieve the purpose of stripping the old wall.

[0100] In Comparative Example 4, the emulsion used is different from that in Examples 1 and 2, and does not have high penetration ability. The emulsion and potassium silicate cannot penetrate into the paint film and the underlying putty layer to solidify into a film, crack and roll up for peeling. It can only crack the surface layer, but cannot roll up the base material, and cannot achieve the purpose of peeling the old wall. Figure 6 As shown, there are small cracks on its surface, which is completely different from the cracking situation in Example 1. Figure 6 The cracks in the wall cannot roll up the base material and cannot easily fall off from the old wall.

[0101] In Comparative Example 5, no thickener was added, and the viscosity of the stripping paint (coating) was insufficient, so that only the surface layer could be cracked, but the base material could not be rolled up, and the purpose of stripping the old wall could not be achieved.

[0102] The stripping mechanism of stripping paint of the present invention is as follows:

[0103] For old wall latex paint with high PVC coating, the paint film itself is loose and porous. High-strength penetrating high-Tg emulsion and potassium silicate penetrate into the paint film and the underlying putty layer to solidify into a film that cracks and peels off. After it dries, it can be peeled off with a slight scraper.

[0104] For old wall latex paint with low PVC coating, the paint film itself is relatively dense. The high-strength penetrating high-Tg emulsion can penetrate, bond and rivet the old coating on the surface to form a film, and then the high-strength penetrating high-Tg emulsion and potassium silicate are used to cure the film to crack and tear the old coating of the substrate, so that the old coating also moves and cracks, thereby separating from the substrate. There are two steps of destruction: the first step is that the film formation process of the high-permeability high-Tg emulsion bonding process also cracks, and the second step is potassium silicate. Due to the gradual volatilization of water, the closed silanol groups in the storage process undergo condensation polymerization reaction with carbon dioxide in the air, gradually generating polysilicates with higher modulus, which are gradually cured to form a film, while releasing the second step of cracking caused by internal stress. This is because potassium silicate forms a three-dimensional rigid network structure when forming a film, which is different from organic polymers that release the internal stress generated during film formation by moving chain segments. Therefore, potassium silicate can gradually release the internal stress during the curing film process. When the internal stress generated by the curing film is greater than the cohesive force of the paint film and greater than the bonding force between the old coating and the substrate, it will cause the paint film and the old coating to move again and tear the putty layer.

[0105] For old wall latex paint with medium PVC, two mechanisms exist simultaneously: cracking during penetration into the cured film and cracking during surface paint film formation.

[0106] In summary, the coating for peeling off the old coating on the wall provided by the embodiment of the present invention has a high-strength penetrating emulsion and potassium silicate, and the emulsion can quickly penetrate into the old coating and bond with the old coating to form a film. The internal stress of the film formed by the slow solidification of the high-strength penetrating high-Tg emulsion and potassium silicate is large, and tearing and cracking are formed, and the old coating film cracks together with the putty at the bottom layer of the old coating, thereby achieving the purpose of peeling off the old coating on the wall. The coating of the present invention is used to peel off the coating layer of the old wall surface, without the need to polish or knock the old wall surface, and the construction process is simple and pollution-free, and the coating on the old wall surface can be quickly peeled off.

[0107] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A coating having the function of stripping off old wall coating, characterized in that: The following raw materials are included by weight: 5-15 parts of water, 0.5-2 parts of dispersant, 0.1-0.5 parts of wetting agent, 0.5-1 parts of defoaming agent, 5-15 parts of titanium dioxide, 10-20 parts of calcined kaolin, 15-25 parts of heavy calcium, 15-35 parts of emulsion, 1-3 parts of cellulose aqueous solution, 0.1-0.5 parts of sodium hydroxide solution, 0.5-2 parts of stabilizer, 10-20 parts of potassium silicate and 0.1-0.5 parts of thickener.

2. The coating for removing old wall coating according to claim 1, characterized in that: The mass percentage of the cellulose aqueous solution is 5-15%, and the mass percentage of the sodium hydroxide solution is 5-15%.

3. The coating having the function of stripping off old wall coating according to claim 2, characterized in that: The following raw materials are included by weight: 9.95 parts of water, 1 part of dispersant, 0.2 parts of wetting agent, 0.6 parts of defoaming agent, 10 parts of titanium dioxide, 15 parts of calcined kaolin, 20 parts of weight, 30 parts of emulsion, 2 parts of cellulose aqueous solution, 0.25 parts of sodium hydroxide solution, 0.8 parts of stabilizer, 10 parts of potassium silicate and 0.2 parts of thickener.

4. The coating having the function of stripping off old wall coating according to claim 1, characterized in that: The following raw materials are included by weight: 9.05 parts of water, 1 part of dispersant, 0.2 parts of wetting agent, 0.6 parts of defoaming agent, 10 parts of titanium dioxide, 15 parts of calcined kaolin, 20 parts of heavy calcium, 20 parts of emulsion, 2 parts of cellulose aqueous solution, 0.25 parts of sodium hydroxide solution, 1.6 parts of stabilizer, 20 parts of potassium silicate and 0.3 parts of thickener.

5. A method for preparing a coating capable of stripping old wall coating according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, mixing water, dispersant, wetting agent and defoamer, stirring evenly to obtain a mixed solution; S2, then add titanium dioxide, calcined kaolin and heavy calcium in sequence and stir evenly; S3, add water and emulsion and stir evenly; S4, adding the cellulose aqueous solution and stirring evenly; S5, then add sodium hydroxide solution and stabilizer in sequence and stir evenly; S6, then add potassium silicate solution, defoamer and thickener in sequence, stir evenly, and filter to obtain the coating.

6. The method for preparing a coating capable of stripping off old wall coating according to claim 5, characterized in that: In the step S1, the stirring speed is 300-400 r / min, and the stirring time is 3-5 min.

7. The method for preparing a coating capable of stripping off old wall coating according to claim 5, characterized in that: In the step S2, the rotation speed of the stirring and dispersing is 1500-2000 r / min, and the stirring time is 20-30 min.

8. The method for preparing a coating capable of stripping off old wall coating according to claim 5, characterized in that: In the step S6, a 100-200 mesh filter is used for filtration.

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