Acid and alkali resistant porcelain enamel waterproof coating and preparation method thereof

Abstract

The application relates to the technical field of concrete waterproof paint, and particularly discloses acid-alkali-resistant porcelain glaze waterproof paint and a preparation method thereof.A kind of acid-alkali-resistant porcelain glaze waterproof paint includes A component and B component, the A component includes the following weight parts of raw materials: water-soluble polyvinyl alcohol 18-22 parts, thickening agent 16-20 parts, talcum powder 4-6 parts, deionized water 25-29 parts, the thickening agent includes modified carboxymethyl cellulose; the B component includes the following weight parts of raw materials: borax 20-40 parts; the preparation method is: the water-soluble polyvinyl alcohol in A component, thickening agent, talcum powder, deionized water are mixed uniformly according to weight parts, the borax of B component is added according to weight parts and uniformly mixed, to form acid-resistant waterproof paint.The acid-alkali-resistant porcelain glaze waterproof paint of the application can be used in the field of concrete surface decoration, and has the advantages of reducing the possibility of peeling of porcelain glaze paint.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of concrete waterproof paint, in particular to an acid-alkali-resistant porcelain enamel waterproof paint and a preparation method thereof. BACKGROUND

[0002] The porcelain enamel paint is similar in texture and appearance to porcelain enamel and is usually composed of pigments, resins, solvents and additives, etc. and has the characteristics of high gloss, smoothness, wear resistance, stain resistance, scratch resistance, etc. and is often used for coating indoor walls, furniture, decorations and the like.

[0003] The common porcelain enamel paint is usually a two-component normal-temperature curing paint. When used, the concrete base surface is usually repaired and leveled with cement, and then the A component and the B component are stirred uniformly and matured according to the proportion, and then the porcelain enamel paint is coated on the pre-processed concrete base surface to complete the coating of the porcelain enamel paint.

[0004] The porcelain enamel paint is easily affected by indoor humidity during use. When the indoor humidity is large, the porcelain enamel paint coated on the wall is prone to peeling, which affects the service life of the porcelain enamel paint. SUMMARY

[0005] In order to reduce the possibility of peeling of the porcelain enamel paint, the application provides an acid-alkali-resistant porcelain enamel waterproof paint and a preparation method thereof.

[0006] In the first aspect, the application provides an acid-alkali-resistant porcelain enamel waterproof paint, which adopts the following technical scheme:

[0007] The acid-alkali-resistant porcelain enamel waterproof paint comprises an A component and a B component. The A component comprises the following raw materials in parts by weight: water-soluble polyvinyl alcohol 18-22 parts, thickening agent 16-20 parts, talcum powder 4-6 parts and deionized water 25-29 parts. The thickening agent comprises modified carboxymethyl cellulose.

[0008] The B component comprises the following raw materials in parts by weight: borax 20-40 parts.

[0009] By adopting the above technical scheme, the modified carboxymethyl cellulose is added to the raw materials. When the prepared paint is coated on the wet concrete surface, the modified carboxymethyl cellulose contacts and dissolves in the moisture on the concrete surface to form a modified carboxymethyl cellulose aqueous solution with increased viscosity, thereby thickening the paint and increasing the adhesion of the paint to the concrete surface, reducing the sensitivity of the paint to indoor humidity. Since the modified carboxymethyl cellulose is prepared by modifying carboxymethyl cellulose, the possibility of carboxymethyl cellulose dissolving in deionized water during the mixing of carboxymethyl cellulose with water-soluble polyvinyl alcohol, talcum powder and deionized water and the preparation of the A component is reduced, so that the paint can continuously absorb the moisture on the concrete surface during the coating process on the concrete, thereby reducing the possibility of peeling of the porcelain enamel paint.

[0010] Preferably, the thickening agent further comprises polyacrylate, and the weight ratio of the polyacrylate and the modified carboxymethyl cellulose is (4-6):(12-14).

[0011] By using the above technical solution, the modified carboxymethyl cellulose and the polyacrylate simultaneously thicken the coating, so that the adhesion of the coating to the surface of the concrete is increased, and the possibility of the coating being peeled is reduced due to the influence of indoor humidity. At the same time, the polyacrylate has acid resistance, and the addition of the polyacrylate to the coating makes the coating have acid resistance. When the viscosity of the carboxymethyl cellulose aqueous solution decreases with the increase of temperature, the viscosity of the polyacrylate increases with the increase of temperature, so that the coating always remains sticky, and the effect of reducing the possibility of the enamel coating being peeled is further achieved.

[0012] Preferably, the modified carboxymethyl cellulose is prepared by wrapping gas-phase silicon dioxide outside the carboxymethyl cellulose, and the weight ratio of the carboxymethyl cellulose and the gas-phase silicon dioxide is (3-5):1.

[0013] Preferably, the particle size of the carboxymethyl cellulose is 40-60 μm.

[0014] By using the above technical solution, the gas-phase silicon dioxide is wrapped on the surface of the carboxymethyl cellulose, which reduces the possibility of the carboxymethyl cellulose contacting with deionized water. When the gas-phase silicon dioxide is wrapped on the surface of the carboxymethyl cellulose and mixed with other raw materials in the coating, the gas-phase silicon dioxide makes the carboxymethyl cellulose uniformly dispersed in the coating, and the gas-phase silicon dioxide can reflect ultraviolet rays, so that the coating is not easy to be aged due to the action of pipelines, and the effect of reducing the possibility of the enamel coating being peeled is further achieved.

[0015] Preferably, the carboxymethyl cellulose is carboxymethyl cellulose quaternary ammonium salt, the weight ratio of the carboxymethyl cellulose and the quaternary ammonium reagent is 1:(9-11), and the preparation method of the carboxymethyl cellulose quaternary ammonium salt is as follows:

[0016] Isopropyl alcohol and water are mixed in a molar ratio of (2-4):1, the carboxymethyl cellulose is added to the mixed solution and uniformly mixed, then potassium hydroxide solution is added and mixed with nitrogen for 30±10 min, the quaternary ammonium reagent is added and mixed with nitrogen at 60±10℃ for 120±10 min, and then the carboxymethyl cellulose quaternary ammonium salt is prepared by acetone precipitation, washing, acetonitrile purification, vacuum drying at 40±10℃ and crushing.

[0017] By adopting the technical scheme, the carboxymethyl cellulose is subjected to quaternary ammonium treatment and forms carboxymethyl cellulose quaternary ammonium salt, so that the carboxymethyl cellulose has broad-spectrum antibacterial activity, the carboxymethyl cellulose quaternary ammonium salt is added into the coating and coated on the surface of the concrete, so that the coating is not easy to provide a growth environment for bacteria, thereby reducing the possibility of infection of bacteria when personnel contact the coating.

[0018] Preferably, the quaternary ammonium reagent is 3-chloro-2-hydroxypropyl trimethyl ammonium chloride.

[0019] By adopting the technical scheme, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is used as a quaternary ammonium reagent to provide a quaternary ammonium salt group for the quaternary ammonium reaction and form carboxymethyl cellulose quaternary ammonium salt with carboxymethyl cellulose, and 3-chloro-2-hydroxypropyl trimethyl ammonium chloride has bactericidal properties, so that the carboxymethyl cellulose quaternary ammonium salt has broad-spectrum antibacterial activity, and the effect of making the coating not easy to provide a growth environment for bacteria is further achieved, thereby reducing the possibility of infection of bacteria when personnel contact the coating.

[0020] Preferably, the talc particle size is 1-10 μm.

[0021] By adopting the technical scheme, the talc is used as an inorganic filler added in the coating, thereby playing a lubricating role in the stirring process of the raw materials, and the talc with a particle size of 1-10 μm is selected, so that the talc improves the leveling property and hiding power of the coating, thereby making the coating surface smooth and uniform, and when the talc particle size is greater than 10 μm, it is easy to produce precipitation in the coating, thereby affecting the uniformity of the coating and further affecting the quality of the coating.

[0022] In the second aspect, the application provides a preparation method of an acid and alkali resistant porcelain enamel waterproof coating, which adopts the following technical scheme:

[0023] The preparation method of the acid and alkali resistant porcelain enamel waterproof coating comprises the following steps:

[0024] The water-soluble polyvinyl alcohol, the thickening agent, the talc and the deionized water in the A component are uniformly mixed according to the weight parts, the borax in the B component is added and uniformly mixed according to the weight parts, and the acid and alkali resistant porcelain enamel waterproof coating is formed.

[0025] By adopting the technical scheme, the raw materials in the B component are added into the mixture of the A component after the raw materials in the A component are mixed, and the coating is formed, at this time, the borax acts as a curing agent of the water-soluble polyvinyl alcohol to catalyze the curing of the water-soluble polyvinyl alcohol, and at the same time, the borax acts as an inorganic filler in the coating to provide strength for the coating while reducing the introduction of new substances in the coating, and the borax also provides antibacterial action for the coating to synergize with the carboxymethyl cellulose quaternary ammonium salt and improve the antibacterial property of the coating.

[0026] In summary, the application has the following beneficial effects:

[0027] 1. The modified carboxymethyl cellulose is added to the raw materials, and when the prepared coating is applied to the surface of the wet concrete, the modified carboxymethyl cellulose contacts and dissolves in the moisture on the surface of the concrete, the viscosity of the prepared modified carboxymethyl cellulose aqueous solution is increased, the coating is thickened, the adhesion between the coating and the surface of the concrete is increased, the sensitivity of the coating to indoor humidity is reduced, and since the modified carboxymethyl cellulose is prepared by modifying carboxymethyl cellulose, the possibility of carboxymethyl cellulose dissolving in deionized water during the mixing of the raw materials such as water-soluble polyvinyl alcohol, talc powder and deionized water to prepare the A component is reduced, so that the coating can continuously absorb the moisture on the surface of the concrete during the coating process, and the effect of reducing the possibility of peeling of the enamel coating is achieved.

[0028] 2. The modified carboxymethyl cellulose and the polyacrylate simultaneously thicken the coating, so that the adhesion between the coating and the surface of the concrete is increased, the possibility of peeling of the coating due to the influence of indoor humidity is reduced, and the polyacrylate has acid resistance. The addition of the polyacrylate to the coating makes the coating have acid resistance. When the viscosity of the carboxymethyl cellulose aqueous solution decreases with the increase of temperature, the viscosity of the polyacrylate increases with the increase of temperature, so that the coating always remains sticky, and the effect of reducing the possibility of peeling of the enamel coating is further achieved.

[0029] 3. The carboxymethyl cellulose is quaternized to form a carboxymethyl cellulose quaternary ammonium salt, so that the carboxymethyl cellulose has a broad-spectrum bacteriostatic activity. The carboxymethyl cellulose quaternary ammonium salt is added to the coating and applied to the surface of the concrete, so that the coating is not easy to provide a growth environment for bacteria, thereby reducing the possibility of infection of bacteria when personnel contact the coating. DETAILED DESCRIPTION

[0030] The application will be further described in detail below in combination with examples.

[0031] Raw materials

[0032] All raw materials in the examples can be obtained by market purchase.

[0033] Preparation example

[0034] Preparation example 1

[0035] Preparation example 1.1

[0036] A carboxymethyl cellulose quaternary ammonium salt is prepared by the following steps:

[0037] Isopropyl alcohol and water were mixed in a ratio of 2:1 by mole, 1 kg of carboxymethyl cellulose was added to the mixed solution and mixed uniformly, then potassium hydroxide solution was added and mixed for 30 min under nitrogen, 11 kg of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride was added and mixed for 120 min under nitrogen at 60°C, precipitated with acetone, washed, purified with acetonitrile, dried at 40°C under vacuum and pulverized to obtain carboxymethyl cellulose quaternary ammonium salt.

[0038] Preparation Example 1.2

[0039] Unlike Preparation Example 1.1, the amount of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride added was 10 kg.

[0040] Preparation Example 1.3

[0041] Unlike Preparation Example 1.1, the amount of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride added was 9 kg.

[0042] Preparation Example 1.4

[0043] Unlike Preparation Example 1.2, the ratio of isopropyl alcohol and water was 3:1 by mole.

[0044] Preparation Example 1.5

[0045] Unlike Preparation Example 1.2, the ratio of isopropyl alcohol and water was 4:1 by mole.

[0046] Preparation Example 1.6

[0047] Unlike Preparation Example 1.2, the same amount of dodecyl trimethyl ammonium chloride was used instead of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride in Preparation Example 1.6.

[0048] Preparation Example 2

[0049] Preparation Example 2.1

[0050] A modified carboxymethyl cellulose was prepared by the following method:

[0051] 3 kg of carboxymethyl cellulose quaternary ammonium salt obtained from Preparation Example 1.1 was mixed with 1 kg of fumed silica to obtain a modified carboxymethyl cellulose.

[0052] Preparation Example 2.2

[0053] Unlike Preparation Example 2.1, the amount of carboxymethyl cellulose quaternary ammonium salt added was 4 kg.

[0054] Preparation Example 2.3

[0055] Unlike Preparation Example 2.1, the amount of carboxymethyl cellulose quaternary ammonium salt added was 5 kg.

[0056] Preparation Examples 2.4-2.8

[0057] Different from Preparation Example 2.2, the carboxymethyl cellulose quaternary ammonium salt in Preparation Examples 2.4-2.8 is equivalent to that from Preparation Examples 1.2-1.6.

[0058] Example

[0059] Example 1

[0060] Example 1.1

[0061] Example 1.11

[0062] An acid and alkali resistant porcelain enamel waterproof coating is prepared by the following method:

[0063] Mix 18 kg of water-soluble polyvinyl alcohol, 20 kg of modified carboxymethyl cellulose with a particle size of 40 μm from Preparation Example 2.1, 4 kg of talc with a particle size of 1 μm, and 29 kg of deionized water in the A component, and mix uniformly. Add 20 kg of borax in the B component and mix uniformly to form an acid resistant waterproof coating.

[0064] Example 1.12-1.13

[0065] Different from Example 1.11, the raw material ratio for preparing the acid and alkali resistant porcelain enamel waterproof coating in Examples 1.12-1.13 is different, as shown in Table 1.

[0066] Table 1 Raw material ratio of Examples 1.12-1.13

[0067]

[0068] Example 1.21-1.23

[0069] Different from Example 1.12, the raw material and ratio of the thickening agent in the raw material for preparing the acid and alkali resistant porcelain enamel waterproof coating in Examples 1.21-1.24 are different, as shown in Table 2.

[0070] Table 2 Raw material ratio of Examples 1.21-1.24

[0071]

[0072] Example 1.3

[0073] Different from Example 1.22, the particle size of talc in Example 1.3 is 20 μm.

[0074] Example 2

[0075] Example 2.1-2.7

[0076] Unlike Example 1.22, the modified carboxymethyl cellulose in Examples 2.1-2.7 is equivalent to that from Preparation Examples 2.2-2.8.

[0077] Comparative Example

[0078] Comparative Example 1

[0079] Unlike Example 1.11, the modified carboxymethyl cellulose in Comparative Example 1 is replaced with an equivalent amount of carboxymethyl cellulose.

[0080] Performance detection test

[0081] An equivalent amount of acid and alkali resistant enamel waterproof coating prepared in Examples 1-2 and Comparative Example 1 is coated on the surface of the concrete with the same pretreatment step in the same way. For the waterproof coating formed after coating, the following performance detection is carried out. The performance detection includes water resistance, bonding strength and antibacterial rate, and the detection data is shown in Table 3.

[0082] 1. Water resistance

[0083] The water resistance of the acid and alkali resistant enamel waterproof coating is detected according to the detection standard of national standard GB / T 1733-1993 "Paint film water resistance test method". The detection environment is: 23℃.

[0084] 2. Bonding strength

[0085] The bonding strength of the acid and alkali resistant enamel waterproof coating is detected according to the detection standard of national standard GB / T 2794-2022 "Determination of viscosity of adhesives". The detection environment is: 23℃.

[0086] 3. Antibacterial rate

[0087] The antibacterial rate of the acid and alkali resistant enamel waterproof coating is detected according to the detection standard of national standard GB / T 21866-2008 "Determination of antibacterial property and antibacterial effect of antibacterial coatings (paint films)". The detection environment is: 23℃.

[0088] Table 3 Performance detection data table

[0089] Water resistance Adhesion strength / MPa Antibacterial rate / % Example 1.11 No foaming, no peeling 3.0 91.00 Example 1.12 No foaming, no peeling 3.1 91.50 Example 1.13 No foaming, no peeling 3.0 91.00 Example 1.21 No foaming, no peeling 3.2 93.00 Example 1.22 No foaming, no peeling 3.3 93.60 Example 1.23 No foaming, no peeling 3.2 93.00 Example 1.24 No foaming, no peeling 3.0 92.50 Example 1.3 No foaming, no peeling 3.0 92.00 Example 2.1 No foaming, no peeling 3.5 95.80 Example 2.2 No foaming, no peeling 3.4 95.50 Example 2.3 No foaming, no peeling 3.8 97.90 Example 2.4 No foaming, no peeling 3.7 97.20 Example 2.5 No foaming, no peeling 4.0 99.99 Example 2.6 No foaming, no peeling 3.9 99.95 Example 2.7 No foaming, no peeling 3.4 92.00 Comparative Example 1 Foaming, peeling 1.0 80.00

[0090] The following data provided in Table 3 will be used to explain the present application in detail.

[0091] In combination with Comparative Example 1 and Examples 1-2, it is found that the water resistance, bonding strength and antibacterial rate of the acid and alkali resistant enamel waterproof coating prepared in Examples 1-2 are all better than those of Comparative Example 1, which shows that the acid and alkali resistant enamel waterproof coating of the present application is better in improving the water resistance, bonding strength and antibacterial rate of the coating.

[0092] Comparative examples 1.11-1.13 were compared with respect to the addition ratio of raw materials, and it was found that the acid and alkali resistant porcelain enamel waterproof coating prepared in comparative example 1.12 performed better in water resistance, adhesion strength and antibacterial rate, which indicated that the raw material ratio of the acid and alkali resistant porcelain enamel waterproof coating prepared in comparative example 1.12 was more optimal.

[0093] In comparative examples 1.21-1.24, the influence of the modification of carboxymethyl cellulose and the compounding of polyacrylate was investigated with comparative example 1.12 as a control, and it was found that the acid and alkali resistant porcelain enamel waterproof coating prepared in comparative examples 1.21-1.24 performed better in water resistance, adhesion strength and antibacterial rate than comparative example 1.12, which might be due to the fact that the compounding of modified carboxymethyl cellulose and polyacrylate increased the viscosity of the coating and thus made it less likely to fall off from the surface of the concrete.

[0094] The acid and alkali resistant porcelain enamel waterproof coating prepared in comparative example 1.22 performed better in water resistance, adhesion strength and antibacterial rate, which indicated that the compounding ratio of modified carboxymethyl cellulose and polyacrylate selected in comparative example 1.22 performed better in improving the water resistance, adhesion strength and antibacterial rate of the acid and alkali resistant porcelain enamel waterproof coating prepared.

[0095] The acid and alkali resistant porcelain enamel waterproof coating prepared in comparative example 1.22 performed better in water resistance, adhesion strength and antibacterial rate than comparative example 1.24, which might be due to the fact that the increased amount of polyacrylate in comparative example 1.24 made it difficult to provide a high viscosity at room temperature.

[0096] In comparative examples 2.1-2.2, the influence of the ratio of carboxymethyl cellulose quaternary ammonium salt to fumed silica in the modified carboxymethyl cellulose was investigated with comparative example 1.22 as a control, and it was found that the acid and alkali resistant porcelain enamel waterproof coating prepared in comparative example 2.1 performed better in water resistance, adhesion strength and antibacterial rate, which indicated that the ratio of carboxymethyl cellulose quaternary ammonium salt to fumed silica selected in comparative example 2.1 performed better in improving the water resistance, adhesion strength and antibacterial rate of the acid and alkali resistant porcelain enamel waterproof coating prepared.

[0097] In comparative examples 2.3-2.4, the influence of the ratio of carboxymethyl cellulose to 3-chloro-2-hydroxypropyl trimethylammonium chloride in the carboxymethyl cellulose quaternary ammonium salt was investigated with comparative example 2.1 as a control, and it was found that the acid and alkali resistant porcelain enamel waterproof coating prepared in comparative example 2.3 performed better in water resistance, adhesion strength and antibacterial rate, which indicated that the ratio of carboxymethyl cellulose to 3-chloro-2-hydroxypropyl trimethylammonium chloride selected in comparative example 2.3 performed better in improving the water resistance, adhesion strength and antibacterial rate of the acid and alkali resistant porcelain enamel waterproof coating prepared.

[0098] Compared with Example 2.3, the influence of the ratio of isopropyl alcohol to water was investigated in Examples 2.5-2.6, and it was found that the acid and alkali resistant porcelain enamel waterproof coating prepared in Example 2.5 performed better in water resistance, adhesion strength and antibacterial rate, which indicated that the ratio of isopropyl alcohol to water selected in Example 2.5 performed better in improving the water resistance, adhesion strength and antibacterial rate of the prepared acid and alkali resistant porcelain enamel waterproof coating.

[0099] Compared with Example 2.5, the influence of different quaternary ammonium reagents was investigated in Example 2.7, and it was found that the acid and alkali resistant porcelain enamel waterproof coating prepared in Example 2.5 performed better in water resistance, adhesion strength and antibacterial rate, which might be caused by the difficulty of the quaternary ammonium reagent selected in Example 2.7 to fully react with carboxymethyl cellulose.

[0100] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An acid and alkali resistant porcelain enamel waterproof paint, characterized by, It comprises A component and B component, the A component comprises the following raw materials by weight: Water-soluble polyvinyl alcohol 18-22 parts, thickening agent 16-20 parts, talc 4-6 parts, deionized water 25-29 parts, the thickening agent comprises modified carboxymethyl cellulose; The B component comprises the following raw materials by weight: borax 20-40 parts; The thickening agent further comprises polyacrylate, and the weight ratio of polyacrylate, polyacrylate and modified carboxymethyl cellulose is (4-6):(12-14); The modified carboxymethyl cellulose is prepared by wrapping carboxymethyl cellulose with fumed silica, and the weight ratio of carboxymethyl cellulose to fumed silica is (3-5):1; The particle size of the carboxymethyl cellulose is 40-60 μm; The carboxymethyl cellulose is carboxymethyl cellulose quaternary ammonium salt, the weight ratio of carboxymethyl cellulose to quaternization reagent is 1:(9-11), and the preparation method of the carboxymethyl cellulose quaternary ammonium salt is: Isopropyl alcohol and water are mixed in a molar ratio of (2-4):1, carboxymethyl cellulose is added to the mixed solution and uniformly mixed, potassium hydroxide solution is added and mixed for 30±10 min under nitrogen, quaternization reagent is added and mixed for 120±10 min under nitrogen at 60±10℃, and then the carboxymethyl cellulose quaternary ammonium salt is prepared by acetone precipitation, washing, acetonitrile purification, vacuum drying at 40±10℃ and crushing; The quaternization reagent is 3-chloro-2-hydroxypropyl trimethylammonium chloride.

2. The acid and alkali resistant porcelain enamel waterproof coating according to claim 1, characterized in that: The particle size of the talc is 1-10 μm.

3. A method of producing the acid and alkali resistant enamel waterproof paint according to claim 1 or 2, characterized by, It comprises the following steps: The water-soluble polyvinyl alcohol, thickening agent, talc and deionized water in the A component are mixed uniformly by weight, and the borax in the B component is added and uniformly mixed by weight to form the acid and alkali resistant enamel waterproof coating.

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