Preparation method of fingerprint-resistant and antibacterial wall paint

Abstract

The present invention provides a method for preparing a fingerprint-resistant antibacterial wall paint coating, wherein the raw materials include phenolic resin, composite solvent, curing agent and nano-silicon dioxide, and the composite solvent includes ethanol and N-methyl pyrrolidone, and the raw materials are mixed at 40-60°C to form a colloidal mixture to obtain a wall paint coating. The present invention uses a composite solvent, and the composite solvent includes ethanol and N-methyl pyrrolidone, wherein ethanol volatilizes during the curing process, and N-methyl pyrrolidone is a high-boiling-point low-volatile solvent, which does not volatilize during the curing process, and after the coating surface is dried, an extractant is used on the coating surface to extract N-methyl pyrrolidone, and a polymer with an opening is formed by thermally induced phase separation, so that the organic matter on the coating surface can be contacted with nano-silicon dioxide through the opening to promote the decomposition of organic matter; the porous coating that is dried further solidifies and shrinks, and finally forms a surface with a nano-scale concave-convex structure, so that the residue of fingerprints can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a method for preparing a fingerprint-resistant and antibacterial wall paint. Background Art

[0002] Wall paint is a common material in home decoration. It is used for indoor wall decoration and protection to protect the wall from the external environment. Wall paint forms a uniform coating on the wall. When people use it, their fingers will inevitably come into contact with the wall coating and leave fingerprints. Fingerprints contain moisture and grease, which provide conditions for microorganisms to reproduce. Therefore, it is necessary to provide a wall paint that is resistant to fingerprints and has good antibacterial effects.

[0003] In order to improve the antibacterial properties of wall paint, a common method is to add antibacterial components to the wall paint. CN118421139A provides a high-efficiency mildew-proof, sterilizing and fire-proof interior wall paint and a preparation method thereof, wherein the interior wall paint includes styrene acrylic emulsion, wetting agent, dispersant, film-forming aid, antibacterial agent, leveling agent, antifreeze agent, defoamer, kaolin, titanium dioxide, talcum powder, heavy calcium carbonate, hydroxyethyl cellulose, nitrogen-phosphorus modified carbon nanotube-based fire retardant and solvent, wherein the antibacterial agent is Ag / CuO@amino graphene antibacterial agent prepared based on in-situ generation method, and the wall paint exhibits super strong mildew-proof and sterilizing ability through the synergistic antibacterial effect of amino graphene, Ag nanoparticles and CuO nanoparticles in the antibacterial agent. However, the above-mentioned antibacterial component is coated inside the polymer formed with the wall paint, and it is difficult to play an antibacterial role, and a large addition amount needs to be used, which will affect the coating performance of the wall paint and is difficult to form a uniform coating.

[0004] Therefore, how to obtain a wall paint that is resistant to fingerprints and has good antibacterial effect is a problem that needs to be solved urgently. Summary of the invention

[0005] Based on this, the first aspect of the present invention provides a method for preparing a fingerprint-resistant and antibacterial wall paint coating, wherein the preparation raw materials include phenolic resin, a composite solvent, a curing agent and nano-silica, the composite solvent includes ethanol and N-methylpyrrolidone, and the preparation raw materials are mixed at 40-60°C to form a colloidal mixture to obtain the wall paint coating.

[0006] The present invention uses a composite solvent, the composite solvent includes ethanol and N-methyl pyrrolidone, wherein ethanol volatilizes during the curing process, and N-methyl pyrrolidone is a high boiling point low volatility solvent, which will not volatilize during the curing process, after the coating surface is dried (i.e., after the ethanol in the composite solvent is substantially volatilized, and the inner part of the coating is partially cured), an extractant (such as water) is used on the coating surface to extract N-methyl pyrrolidone, and a high polymer with an opening is formed by thermally induced phase separation, so that organic matter on the coating surface (derived from environmental pollutants such as fingerprints) can be contacted with nano-silicon dioxide through the opening to promote organic matter decomposition, and nano-silicon dioxide is not easy to leak; the porous coating that is dried further solidifies and shrinks, and finally forms a surface with a nano-scale concave-convex structure, thereby reducing the residue of fingerprints. Therefore, the wall paint coating of the present invention has better fingerprint resistance and antibacterial properties.

[0007] Furthermore, the mass ratio of the phenolic resin to the composite solvent is 1:(0.2-0.5). If the ratio of the composite solvent is too high, the curing time will be too long, and as the ratio of the composite solvent increases, the ratio of N-methylpyrrolidone will also increase, which will lead to an excessively large pore size; if the ratio of the composite solvent is too low, it will be difficult to form a uniform coating.

[0008] Furthermore, the curing agent comprises at least one of benzenesulfonyl chloride, hexamethylenetetraethylamine and m-diphenylamine.

[0009] Furthermore, the particle size of the nano-silica is 50-100 nm. Nano-silica with a smaller particle size can exert a better antibacterial effect, but it is also easy to detach from the polymer network; while nano-silica with a larger particle size has a poor antibacterial effect. Furthermore, the nano-silica is mesoporous nano-silica. Mesoporous nano-silica has a larger specific surface area and can exert a better antibacterial effect.

[0010] Furthermore, the mass ratio of the phenolic resin to the nano-silicon dioxide is 1:(0.001-0.005). The silicon dioxide in the coating of the present invention has a good antibacterial effect within this range, and this content of silicon dioxide will not affect the leveling performance of the coating.

[0011] Furthermore, the volume ratio of the ethanol to the N-methylpyrrolidone is (8-15):1. As the content of the composite solvent increases, the pore size of the polymer network formed by solidification becomes larger, and the proportion of open pores increases, which is beneficial to improve the antibacterial effect of nano-silicon dioxide and increase the roughness of the coating surface; however, if the content of the composite solvent is too high, the resulting pore size is too large, which may cause the leakage of nano-silicon dioxide, resulting in the failure of the antibacterial effect and a threat to human health. Furthermore, the volume ratio of the ethanol to the N-methylpyrrolidone is (8-10):1. The above preferred range can obtain the best anti-fingerprint and antibacterial effects.

[0012] The second aspect of the present invention provides a fingerprint-resistant and antibacterial wall paint. The wall paint of the present invention has better fingerprint-resistant and antibacterial properties.

[0013] The third aspect of the present invention provides an application of a fingerprint-resistant and antibacterial wall paint coating. The wall paint coating is obtained by the above-mentioned preparation method, and the wall paint coating is applied to a wall surface to form a coating, and is dried at a low temperature of 40-60°C. After the coating surface is dry, absorbent paper is covered on the coating surface, and the temperature of the absorbent paper is 10-20°C. The absorbent paper is removed after covering for 3-6 hours.

[0014] The above-mentioned wall paint uses a composite solvent. After the coating is dried on the surface, N-methylpyrrolidone in the coating is extracted by absorbent paper, resulting in thermally induced phase separation to form a polymer coating with open pores, so that organic matter on the surface of the coating (derived from environmental pollutants such as fingerprints) can contact with nano-silicon dioxide through the open pores to promote the decomposition of the organic matter, and the nano-silicon dioxide is not easy to leak; the surface-dried porous coating is further cured and shrunk, and finally a surface with a nano-scale concave-convex structure is formed, thereby reducing the residue of fingerprints. DETAILED DESCRIPTION

[0015] For ease of understanding of the application, the application will be described more fully below. The application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the application more thorough and comprehensive.

[0016] Example 1

[0017] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 15:1), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0018] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 40℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0019] Example 2

[0020] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 15:1), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 80 mm). 5 kg of 2130 phenolic resin, 1.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0021] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 40℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0022] Example 3

[0023] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 8:1), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0024] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 50℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 20℃. After covering for 6h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0025] Example 4

[0026] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 15:1), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 200 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0027] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 40℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0028] Example 5

[0029] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 15:1), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.005 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0030] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 40℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0031] Example 6

[0032] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 15:1), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0033] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 60℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0034] Example 7

[0035] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 10:1), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0036] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 40℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0037] Example 8

[0038] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 15:1), curing agent hexamethylenetetraethylamine and nano silicon dioxide (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano silicon dioxide are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0039] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 40℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0040] Example 9

[0041] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 15:1), curing agent m-diphenylamine and nano silicon dioxide (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano silicon dioxide are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0042] Apply the paint to the wall with a coating density of 80g / m 2, the coating is dried at 40℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0043] Comparative Example 1

[0044] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, solvent (ethanol), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0045] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is dried at 40℃ for 1h until it is surface dry, and the surface of the surface dry coating is covered with absorbent paper, the temperature of the absorbent paper is 10℃. After covering for 3h, remove the absorbent paper, and the coating is completed after the coating is further cured.

[0046] Comparative Example 2

[0047] A fingerprint-resistant and antibacterial wall paint, the raw materials for preparation include 2130 phenolic resin, composite solvent (ethanol and N-methylpyrrolidone, volume ratio of 15:1), curing agent benzenesulfonyl chloride and mesoporous nano-silica (particle size 80 mm). 5 kg of 2130 phenolic resin, 2.5 kg of composite solvent, 0.6 kg of benzenesulfonyl chloride and 0.04 kg of nano-silica are weighed, stirred and mixed at 40° C. for 30 minutes to form a colloidal mixture to obtain the wall paint.

[0048] Apply the paint to the wall with a coating density of 80g / m 2 , the coating is surface dry after drying at 40℃ for 1h, and continues to cure until it is completely cured.

[0049] The coatings of the above examples and comparative examples were subjected to antibacterial performance tests and fingerprint resistance tests.

[0050] Antibacterial performance test: Tested in accordance with GB / T 1741-2020 "Wall Paint Antibacterial Performance Test Standard".

[0051] Determination of fingerprint resistance: After washing and drying their hands, the tester first gently touches the entire face with both hands to simulate the daily contact between hands and face, so that the hands are attached to daily pollutants such as oil and sweat naturally secreted by the skin. Place the finger on the coating surface for about 3 seconds, and then remove the finger. Observe and record the fingerprint morphology left on the coating. If the fingerprint is clearly visible, it means that the coating has a poor anti-fingerprint effect; if the fingerprint is slightly blurred, it indicates that its anti-fingerprint effect is at a medium level; and if there is almost or no fingerprint left on the coating, it means that the coating has an excellent anti-fingerprint effect.

[0052] Table 1 Antibacterial performance test and fingerprint resistance test results

[0053] Grouping Antibacterial rate (Escherichia coli) Anti-fingerprint performance Example 1 98.5％ No fingerprints Example 2 98.5％ No fingerprints Example 3 99.9％ No fingerprints Example 4 97.6％ No fingerprints Example 5 97.2％ No fingerprints Example 6 97.6％ No fingerprints Example 7 99.8％ No fingerprints Example 8 97.8％ No fingerprints Example 9 97.2％ No fingerprints Comparative Example 1 10.25％ There are fingerprints Comparative Example 2 10.13％ There are fingerprints

[0054] According to the data in Table 1, the effect of Example 1-9 is better than that of Comparative Example 1-2, because the present invention uses a composite solvent, and the composite solvent includes ethanol and N-methyl pyrrolidone, wherein ethanol volatilizes during the curing process, and N-methyl pyrrolidone is a high boiling point and low volatility solvent, which will not volatilize during the curing process, and after the coating is dried (i.e., after the ethanol in the composite solvent is basically volatilized, and the internal part of the coating is cured), an extractant (such as water) is used on the coating surface to extract N-methyl pyrrolidone, and a polymer with an opening is formed by thermally induced phase separation, so that the organic matter on the coating surface (derived from environmental pollutants such as fingerprints) can be contacted with nano-silicon dioxide through the opening to promote the decomposition of organic matter, and nano-silicon dioxide is not easy to leak; the porous coating dried on the surface is further cured and shrunk, and finally a surface with a nano-scale concave-convex structure is formed, thereby reducing the residue of fingerprints. In Comparative Example 1, no composite solvent is used, and in Comparative Example 2, no extractant is used to treat the coating after drying on the surface to remove N-methyl pyrrolidone, and the above effects cannot be achieved.

[0055] The antibacterial rate of Example 2 is low, because the proportion of its phenolic resin is too high, the gap of the formed polymer network is too small, and there are fewer openings. Example 4 uses nano-silica with a larger particle size and a larger specific surface area, which limits the performance of its antibacterial properties. Example 5 uses reduced mesoporous nano-silica, but it can still maintain a better antibacterial effect, which shows that this solution can reduce the amount of mesoporous nano-silica used. The effects of Examples 3 and 7 are the best, because they use a preferred composite solvent. By adjusting the volume ratio of ethanol and N-methylpyrrolidone in the composite solvent, a coating with a suitable pore size can be obtained, thereby obtaining a better antibacterial and anti-fingerprint effect.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a fingerprint-resistant and antibacterial wall paint, characterized in that: The preparation raw materials include phenolic resin, composite solvent, curing agent and nano-silicon dioxide, the composite solvent includes ethanol and N-methylpyrrolidone, the preparation raw materials are mixed at 40-60°C to form a colloidal mixture to obtain the wall paint, the mass ratio of the phenolic resin to the composite solvent is 1:(0.3-0.5), the particle size of the nano-silicon dioxide is 50-100nm, the mass ratio of the phenolic resin to the nano-silicon dioxide is 1:(0.001-0.008), and the volume ratio of the ethanol to the N-methylpyrrolidone is (8-15):

1.

2. The preparation method according to claim 1, characterized in that: The curing agent comprises at least one of benzenesulfonyl chloride, hexamethylenetetraethylamine and m-diphenylamine.

3. The preparation method according to claim 1, characterized in that: The nano silicon dioxide is mesoporous nano silicon dioxide.

4. The preparation method according to claim 1, characterized in that: In the composite solvent, the volume ratio of the ethanol to the N-methylpyrrolidone is (8-10):

1.

5. A fingerprint-resistant and antibacterial wall paint, characterized in that: The method is obtained by using the preparation method according to any one of claims 1 to 4.

6. Application of a fingerprint-resistant and antibacterial wall paint, characterized in that: The wall paint is obtained by the preparation method according to any one of claims 1 to 4, the wall paint is applied to a wall surface to form a coating, and is dried at a low temperature of 40-60° C. After the coating is surface-dried, absorbent paper is covered on the coating surface, the temperature of the absorbent paper is 10-20° C., and the absorbent paper is removed after covering for 3-6 hours.