Coating for decorative plate and preparation method thereof

Abstract

The invention discloses a coating for a decorative plate and a preparation method of the coating. The concrete is prepared from the following raw materials in parts by weight: 50-100 parts of cement, 3-8 parts of pigment, 30-60 parts of colored sand, 3-5 parts of a water reducing agent, 3-5 parts of a wetting agent and 4-6 parts of a mildew preventive. The prepared coating for the decorative plate is low in preparation cost, high in adhesive force and high in antibacterial ability. In the components, sulfonated succinic acid dioctyl ester and 1-butyl-3-methylimidazolium hexafluorophosphate are combined for use, the adhesion performance of the coating is improved, dodecyl dimethyl benzyl ammonium chloride and piperine are combined for use, the antibacterial performance of the material is improved, and synergistic interaction is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of building material preparation, and particularly relates to a coating for decorative panels and a preparation method thereof. Background Art

[0002] Decorative panel coatings are specialized coatings designed for use on decorative panels (such as density fiberboard, calcium silicate board, plywood, wood-plastic board, and metal panels) to enhance their aesthetics, durability, and functionality. They protect the substrate while also imparting color, texture, or special effects (such as simulated wood grain, stone texture, or matte / high-gloss finishes). They are widely used in furniture, interior and exterior walls, and ceilings.

[0003] Decorative panel coatings generally have poor adhesion during construction and use. The coating easily falls off the surface of the decorative panel, especially on low-surface-energy materials such as nylon and TR90. After spraying, it may not adhere firmly, causing the coating to peel off. Decorative panel coatings have good antibacterial effects in the early stage, but the antibacterial properties decrease significantly over time (such as after a few months), and they cannot inhibit the growth of bacteria or mold for a long time. The coating is only effective against some bacteria (such as Escherichia coli), but has poor inhibitory effects on mold, fungi or other pathogens (such as Staphylococcus aureus). In long-term humid environments (such as bathrooms and kitchens), bacteria and mold form stubborn biofilms on the coating surface that are difficult to remove. Summary of the Invention

[0004] The object of the present invention is to provide a coating for decorative panels and a preparation method thereof.

[0005] A coating for decorative panels is prepared from the following raw materials in parts by weight: 50-100 parts of cement, 3-8 parts of pigment, 30-60 parts of colored sand, 3-5 parts of water reducing agent, 3-5 parts of wetting agent, and 4-6 parts of mildewproofing agent.

[0006] The cement is one or more of PO 42.5 ordinary Portland cement, PW 42.5 white Portland cement, LH42.5 low-alkali cement or R·SAC rapid-hardening sulphoaluminate cement.

[0007] The pigment is one or more of iron oxide yellow, iron oxide red, iron oxide black, titanium dioxide, phthalocyanine blue, ultramarine blue, lithopone, and carbon black.

[0008] The water reducer is one or more of calcium lignin sulfonate, sodium lignin sulfonate, β-naphthalene sulfonate formaldehyde condensate, and β-naphthalene sulfonate formaldehyde condensate.

[0009] The wetting agent is a mixture of dioctyl sulfosuccinate and 1-butyl-3-methylimidazolium hexafluorophosphate in a mass ratio of (1-5):1.

[0010] The mildew inhibitor is a mixture of dodecyldimethylbenzyl ammonium chloride and piperine in a mass ratio of (1-3):1.

[0011] The method for preparing the coating for decorative panels comprises feeding the raw materials for preparing the coating for decorative panels into a dry powder compulsory mixer for stirring at a stirring speed of 40-80 rpm and a stirring time of 20-60 min.

[0012] A method for preparing a decorative board comprises the following steps:

[0013] (1) Clean and moisten the substrate;

[0014] (2) Mixing the coating for decorative panels according to claim 1 with water in a mass ratio of (4-8):1 to obtain a spray coating, spraying the spray coating on a wet substrate and then curing the coating. After curing, the coating is placed in a water-free, room-temperature environment for 48-96 hours, and then surface-treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.3-0.7 MPa, the flow rate is 1-3 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 35-45 cm, and the spray width is 1.2-1.4 m; the curing time is 48-72 hours, the temperature is 25-35°C, and the relative humidity is 90% or above;

[0015] (3) A protective film is applied on the rough decorative board to obtain the decorative board with the decorative board coating.

[0016] The substrate is a calcium silicate board, a cement fiber pressure board, a ceramsite board or an aluminum single board.

[0017] The protective film is a polyethylene self-adhesive film, a polypropylene self-adhesive film or pearl cotton.

[0018] The present invention has the following beneficial effects: The coating for decorative panels prepared by the present invention has low production cost, strong adhesion, and strong antibacterial properties. The combination of dioctyl sulfosuccinate and 1-butyl-3-methylimidazolium hexafluorophosphate improves the coating's adhesion, while the combination of dodecyldimethylbenzyl ammonium chloride and piperine enhances the material's antibacterial properties, creating a synergistic effect. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present invention, the present invention will be described more fully below. However, the present invention 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 present invention more thorough and comprehensive.

[0020] Example 1

[0021] A coating for decorative panels is prepared from the following raw materials in parts by weight: 80 parts of PO 42.5 ordinary Portland cement, 6 parts of yellow iron oxide, 45 parts of colored sand, 4 parts of calcium lignin sulfonate, 4 parts of a wetting agent, and 5 parts of a mildew preventer; the wetting agent is a mixture of dioctyl sulfosuccinate and 1-butyl-3-methylimidazolium hexafluorophosphate in a mass ratio of 3:1; the mildew preventer is a mixture of dodecyldimethylbenzyl ammonium chloride and piperine in a mass ratio of 2:1.

[0022] The method for preparing the coating for decorative panels comprises feeding the raw materials for preparing the coating for decorative panels into a dry powder compulsory mixer for stirring at a stirring speed of 60 revolutions per minute for a stirring time of 40 minutes.

[0023] A method for preparing a decorative board comprises the following steps:

[0024] (1) Clean and moisten the calcium silicate board for later use;

[0025] (2) The coating for decorative panels according to claim 1 is mixed with water in a mass ratio of 6:1 to obtain a spray coating, which is sprayed on a wet substrate and then cured. After the curing is completed, the coating is placed in a water-free, room-temperature environment for 72 hours, and then surface treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.5 MPa, the flow rate is 2 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 40 cm, and the spray width is 1.3 m; the curing time is 60 hours, the temperature is 30°C, and the relative humidity is 90% or above;

[0026] (3) Coating a polyethylene self-adhesive film on the rough decorative board to obtain the decorative board with the decorative board coating.

[0027] Example 2

[0028] A coating for decorative panels is prepared from the following raw materials in parts by weight: 50 parts of PW 42.5 white Portland cement, 3 parts of black iron oxide, 30 parts of colored sand, 3 parts of sodium lignin sulfonate, 3 parts of a wetting agent, and 4 parts of a mildewcide; the wetting agent is a mixture of dioctyl sulfosuccinate and 1-butyl-3-methylimidazolium hexafluorophosphate in a mass ratio of 1:1; the mildewcide is a mixture of dodecyldimethylbenzyl ammonium chloride and piperine in a mass ratio of 1:1.

[0029] The method for preparing the coating for decorative panels comprises feeding the raw materials for preparing the coating for decorative panels into a dry powder compulsory mixer for stirring at a stirring speed of 40 revolutions per minute for a stirring time of 60 minutes.

[0030] A method for preparing a decorative board comprises the following steps:

[0031] (1) Clean and moisten the cement fiber pressure plate for later use;

[0032] (2) The coating for decorative panels according to claim 1 is mixed with water in a mass ratio of 4:1 to obtain a spray coating, which is sprayed on a wet substrate and then cured. After the curing is completed, the coating is placed in a water-free, room-temperature environment for 48 hours, and then surface treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.3 MPa, the flow rate is 1 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 35 cm, and the spray width is 1.2 m; the curing time is 48 hours, the temperature is 25°C, and the relative humidity is 90% or above;

[0033] (3) Coating a polypropylene self-adhesive film on the crude decorative board to obtain the decorative board with the decorative board coating.

[0034] Example 3

[0035] A coating for decorative panels is prepared from the following raw materials in parts by weight: 100 parts of R·SAC fast-hardening sulphoaluminate cement, 8 parts of phthalocyanine blue, 60 parts of colored sand, 5 parts of β-naphthalenesulfonate formaldehyde condensate, 5 parts of a wetting agent, and 6 parts of a mildew preventer; the wetting agent is a mixture of dioctyl sulfosuccinate and 1-butyl-3-methylimidazolium hexafluorophosphate in a mass ratio of 4:1; the mildew preventer is a mixture of dodecyldimethylbenzyl ammonium chloride and piperine in a mass ratio of 3:1.

[0036] The method for preparing the coating for decorative panels comprises feeding the raw materials for preparing the coating for decorative panels into a dry powder compulsory mixer for stirring at a stirring speed of 80 revolutions per minute for a stirring time of 20 minutes.

[0037] A method for preparing a decorative board comprises the following steps:

[0038] (1) Clean and moisten the ceramsite board;

[0039] (2) The coating for decorative panels according to claim 1 is mixed with water in a mass ratio of 7:1 to obtain a spray coating, which is sprayed on a wet substrate and then cured. After the curing is completed, the coating is placed in a water-free, room-temperature environment for 96 hours, and then surface treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.7 MPa, the flow rate is 3 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 45 cm, and the spray width is 1.4 m; the curing time is 72 hours, the temperature is 35°C, and the relative humidity is 90% or above;

[0040] (3) The decorative board with the decorative board coating is obtained by coating the rough decorative board with pearl cotton.

[0041] Comparative Example 1

[0042] A coating for decorative panels is prepared from the following raw materials in parts by weight: 80 parts of PO 42.5 ordinary Portland cement, 6 parts of yellow iron oxide, 45 parts of colored sand, 4 parts of calcium lignin sulfonate, 4 parts of dioctyl sulfosuccinate, and 5 parts of a mildewcide; the mildewcide is a mixture of dodecyldimethylbenzyl ammonium chloride and piperine in a mass ratio of 2:1.

[0043] The method for preparing the coating for decorative panels comprises feeding the raw materials for preparing the coating for decorative panels into a dry powder compulsory mixer for stirring at a stirring speed of 60 revolutions per minute for a stirring time of 40 minutes.

[0044] A method for preparing a decorative board comprises the following steps:

[0045] (1) Clean and moisten the calcium silicate board for later use;

[0046] (2) The coating for decorative panels according to claim 1 is mixed with water in a mass ratio of 6:1 to obtain a spray coating, which is sprayed on a wet substrate and then cured. After the curing is completed, the coating is placed in a water-free, room-temperature environment for 72 hours, and then surface treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.5 MPa, the flow rate is 2 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 40 cm, and the spray width is 1.3 m; the curing time is 60 hours, the temperature is 30°C, and the relative humidity is 90% or above;

[0047] (3) Coating a polyethylene self-adhesive film on the rough decorative board to obtain the decorative board with the decorative board coating.

[0048] Comparative Example 2

[0049] A coating for decorative panels is prepared from the following raw materials in parts by weight: 80 parts of PO 42.5 ordinary Portland cement, 6 parts of yellow iron oxide, 45 parts of colored sand, 4 parts of calcium lignin sulfonate, 4 parts of 1-butyl-3-methylimidazolium hexafluorophosphate, and 5 parts of a mildewcide; the mildewcide is a mixture of dodecyldimethylbenzyl ammonium chloride and piperine in a mass ratio of 2:1.

[0050] The method for preparing the coating for decorative panels comprises feeding the raw materials for preparing the coating for decorative panels into a dry powder compulsory mixer for stirring at a stirring speed of 60 revolutions per minute for a stirring time of 40 minutes.

[0051] A method for preparing a decorative board comprises the following steps:

[0052] (1) Clean and moisten the calcium silicate board for later use;

[0053] (2) The coating for decorative panels according to claim 1 is mixed with water in a mass ratio of 6:1 to obtain a spray coating, which is sprayed on a wet substrate and then cured. After the curing is completed, the coating is placed in a water-free, room-temperature environment for 72 hours, and then surface treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.5 MPa, the flow rate is 2 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 40 cm, and the spray width is 1.3 m; the curing time is 60 hours, the temperature is 30°C, and the relative humidity is 90% or above;

[0054] (3) Coating a polyethylene self-adhesive film on the rough decorative board to obtain the decorative board with the decorative board coating.

[0055] Comparative Example 3

[0056] A coating for decorative panels is prepared from the following raw materials in parts by weight: 80 parts of PO 42.5 ordinary Portland cement, 6 parts of yellow iron oxide, 45 parts of colored sand, 4 parts of calcium lignin sulfonate, 4 parts of a wetting agent, and 5 parts of dodecyldimethylbenzylammonium chloride; the wetting agent is a mixture of dioctyl sulfosuccinate and 1-butyl-3-methylimidazolium hexafluorophosphate in a mass ratio of 3:1.

[0057] The method for preparing the coating for decorative panels comprises feeding the raw materials for preparing the coating for decorative panels into a dry powder compulsory mixer for stirring at a stirring speed of 60 revolutions per minute for a stirring time of 40 minutes.

[0058] A method for preparing a decorative board comprises the following steps:

[0059] (1) Clean and moisten the calcium silicate board for later use;

[0060] (2) The coating for decorative panels according to claim 1 is mixed with water in a mass ratio of 6:1 to obtain a spray coating, which is sprayed on a wet substrate and then cured. After the curing is completed, the coating is placed in a water-free, room-temperature environment for 72 hours, and then surface treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.5 MPa, the flow rate is 2 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 40 cm, and the spray width is 1.3 m; the curing time is 60 hours, the temperature is 30°C, and the relative humidity is 90% or above;

[0061] (3) Coating a polyethylene self-adhesive film on the rough decorative board to obtain the decorative board with the decorative board coating.

[0062] Comparative Example 4

[0063] A coating for decorative panels is prepared from the following raw materials in parts by weight: 80 parts of PO 42.5 ordinary Portland cement, 6 parts of yellow iron oxide, 45 parts of colored sand, 4 parts of calcium lignin sulfonate, 4 parts of a wetting agent, and 5 parts of piperine; the wetting agent is a mixture of dioctyl sulfosuccinate and 1-butyl-3-methylimidazolium hexafluorophosphate in a mass ratio of 3:1.

[0064] The method for preparing the coating for decorative panels comprises feeding the raw materials for preparing the coating for decorative panels into a dry powder compulsory mixer for stirring at a stirring speed of 60 revolutions per minute for a stirring time of 40 minutes.

[0065] A method for preparing a decorative board comprises the following steps:

[0066] (1) Clean and moisten the calcium silicate board for later use;

[0067] (2) The coating for decorative panels according to claim 1 is mixed with water in a mass ratio of 6:1 to obtain a spray coating, which is sprayed on a wet substrate and then cured. After the curing is completed, the coating is placed in a water-free, room-temperature environment for 72 hours, and then surface treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.5 MPa, the flow rate is 2 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 40 cm, and the spray width is 1.3 m; the curing time is 60 hours, the temperature is 30°C, and the relative humidity is 90% or above;

[0068] (3) Coating a polyethylene self-adhesive film on the rough decorative board to obtain the decorative board with the decorative board coating.

[0069] Experimental example

[0070] Adhesion of the spray coatings prepared in Examples 1-3 and Comparative Examples 1-2 was measured in accordance with the provisions of GB / T 9286-2021 "Cross-cut Test for Paints and Varnishes." A grid (6×6) was cut on the surface of the decorative panel coating using a cutter. The grid area was adhered with standard pressure-sensitive tape and quickly peeled off at a 60° angle. The coating was observed for shedding. The adhesion grade (0 is best, 5 is worst) was assessed based on the proportion of shedding area. See Table 1:

[0071] Table 1

[0072] grade Shedding area ratio Situation Description 0 0％ The cutting edge is completely smooth and without shedding 1 ≤5％ Small pieces of coating peeled off (at the intersection) 2 5％-15％ The coating is partially peeling off along the cut edge 3 15％-35％ Large area peeling (part of the mesh area peeling off) 4 35％-65％ Severe shedding (more than half of the grid area) 5 ＞65％ Complete peeling of the coating

[0073] The measurement results are shown in Table 2:

[0074]

[0075]

[0076] The antibacterial properties of the artificial stone decorative panels prepared in Examples 1-3 and Comparative Examples 3-4 were determined in accordance with the provisions of GB / T 21866-2008 "Determination of Antibacterial Properties and Antibacterial Effects of Antibacterial Coatings (Paint Films)". The test strains were Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The determination method was as follows: a bacterial solution (concentration 10 6 CFU / mL); cover with a sterile film to ensure full contact between the bacterial solution and the surface; after culturing for 24 hours, elute the residual colonies with neutralizing solution.

[0077] Calculate the inhibition rate:

[0078] Inhibition rate (%) = (AB) / A × 100;

[0079] A: colony count of blank control group (CFU / mL); B: colony count of sample group (CFU / mL).

[0080] The experimental results were statistically analyzed using SPSS 24.0 software, and the measurement data were analyzed using The data were expressed as mean ± standard deviation. The Kolmogorov-Smirnov test was used for data normality test. For data that met the normal distribution, the t-test was used to compare the mean differences between the two groups. The difference was considered statistically significant when P < 0.05. The results are shown in Table 2:

[0081] Table 2

[0082]

[0083] Note: * represents P < 0.05 compared with Example 1.

[0084] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A coating for decorative panels, characterized in that: The invention is prepared from the following raw materials in parts by weight: 50-100 parts of cement, 3-8 parts of pigment, 30-60 parts of colored sand, 3-5 parts of water reducing agent, 3-5 parts of wetting agent and 4-6 parts of mildew preventer.

2. The coating for decorative panels according to claim 1, characterized in that: The cement is one or more of PO 42.5 ordinary Portland cement, PW 42.5 white Portland cement, LH42.5 low-alkali cement or R·SAC rapid-hardening sulphoaluminate cement.

3. The coating for decorative panels according to claim 1, characterized in that: The pigment is one or more of iron oxide yellow, iron oxide red, iron oxide black, titanium dioxide, phthalocyanine blue, ultramarine blue, lithopone, and carbon black.

4. The coating for decorative panels according to claim 1, characterized in that: The water reducer is one or more of calcium lignin sulfonate, sodium lignin sulfonate, β-naphthalene sulfonate formaldehyde condensate, and β-naphthalene sulfonate formaldehyde condensate.

5. The coating for decorative panels according to claim 1, characterized in that: The wetting agent is a mixture of dioctyl sulfosuccinate and 1-butyl-3-methylimidazolium hexafluorophosphate in a mass ratio of (1-5):

1.

6. The coating for decorative panels according to claim 1, characterized in that: The mildew inhibitor is a mixture of dodecyldimethylbenzyl ammonium chloride and piperine in a mass ratio of (1-3):

1.

7. The method for preparing the coating for decorative panels according to claim 1, characterized in that: The raw materials for preparing the coating for decorative panels are fed into a dry powder compulsory mixer for stirring at a stirring speed of 40-80 rpm and a stirring time of 20-60 min.

8. A method for preparing a decorative board, characterized in that: The following steps are involved: (1) Clean and moisten the substrate; (2) Mixing the coating for decorative panels according to claim 1 with water in a mass ratio of (4-8):1 to obtain a spray coating, spraying the spray coating on a wet substrate and then curing the coating. After curing, the coating is placed in a water-free, room-temperature environment for 48-96 hours, and then surface-treated to obtain a crude decorative panel; the spray nozzle air pressure is 0.3-0.7 MPa, the flow rate is 1-3 kg / min, the angle between the nozzle and the surface to be sprayed is 90°, the distance between the nozzle and the surface to be sprayed is 35-45 cm, and the spray width is 1.2-1.4 m; the curing time is 48-72 hours, the temperature is 25-35°C, and the relative humidity is 90% or above; (3) A protective film is applied on the rough decorative board to obtain the decorative board with the decorative board coating.

9. The method for preparing the decorative board according to claim 8, characterized in that: The substrate is a calcium silicate board, a cement fiber pressure board, a ceramsite board or an aluminum single board.

10. The method for preparing the decorative board according to claim 8, characterized in that: The protective film is a polyethylene self-adhesive film, a polypropylene self-adhesive film or pearl cotton.

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