Economical flexible scrubbing-resistant inorganic coating and preparation method thereof

Abstract

The invention provides an economical flexible scrub-resistant inorganic coating which is prepared by compounding an interpenetrating network inorganic hybrid emulsion as a film-forming substance, titanium dioxide as a pigment, a high-covering-power-effect filler and a common filler as fillers, and a wetting agent, a dispersing agent, a defoaming agent, a thickening agent, an anti-freezing agent, a coalescing agent, a multifunctional pH value regulator and a preservative as auxiliary materials. The inorganic coating provided by the invention has the characteristics of low cost, scrubbing resistance and difficulty in peeling and cracking.

Description

Technical Field

[0001] The invention relates to the technical field of inorganic coatings, and in particular to an economical, flexible, scrub-resistant inorganic coating and a preparation method thereof. Technical Background

[0002] With the improvement of people's living standards and the continuous improvement of environmental awareness, the environmental protection requirements for architectural coatings are becoming increasingly stringent. Traditional organic latex paints will add a certain amount of volatile organic compounds (VOCs) during the production process. These volatile organic compounds will continue to be released into the environment during the subsequent use of the paint, causing environmental pollution. On the other hand, the modern "Code for Fire Protection Design of Interior Decoration of Buildings" clearly stipulates that the fire protection design of interior decoration of industrial and civil buildings should actively adopt non-combustible and flame-retardant materials, and avoid the use of materials that produce a large amount of thick smoke and toxic gases when burned. Traditional organic latex paints are mostly flammable materials (B2 grade) and will produce a large amount of thick smoke and toxic gases when burned. The volatile organic compound content in inorganic coatings is extremely low or even zero, the coating film is non-combustible or flame-retardant (A grade), and the smoke toxicity is safe level (AQ1 grade), making it the first choice for interior decoration coatings for industrial and civil buildings, subways, factories and warehouses.

[0003] However, the current inorganic coatings market is highly chaotic, with varying degrees of quality. Many low-priced inorganic coatings on the market are high-pigment-to-binder ratio inorganic coatings, and some are even inferior latex coatings. These products generally suffer from low fire ratings, poor hiding power, and poor scrub resistance. Furthermore, inorganic coatings undergo a hydroxyl dehydration and polycondensation reaction during drying, resulting in significant volume shrinkage and significant internal stress, which can cause the coating to peel from the putty layer, causing peeling and cracking. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a method for preparing an economical, flexible, scrub-resistant inorganic coating that is low in cost, scrub-resistant, and not prone to peeling or cracking. To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] An economical, flexible, scrub-resistant inorganic coating, characterized in that the economical, flexible, scrub-resistant inorganic coating is composed of an interpenetrating network inorganic hybrid emulsion as a film-forming substance, titanium dioxide as a pigment, high hiding power fillers and ordinary fillers as fillers, and supplemented with a wetting agent, a dispersant, a defoaming agent, a thickener, an antifreeze agent, a film-forming aid, a hydrophobic agent, a multifunctional pH regulator, and an antibacterial agent.

[0006] Preferably, based on 100 parts by mass, the content of each component in the economical flexible scrub-resistant inorganic coating is:

[0007]

[0008] Preferably, the defoaming agent is a polymer composite mineral oil defoaming agent, such as one or a combination of molecular-grade defoaming agents, mineral oil-based defoaming agents, etc.

[0009] Preferably, the wetting agent is an alkylphenol-free non-ionic surfactant, such as one or a combination of hydrophilic alkyl polyoxyethylene ether, synthetic alcohol polyoxyethylene ether wetting agents, etc.

[0010] Preferably, the dispersant is one or a combination of polyacrylic acid sodium salt dispersant, a pigment-affinity group-modified polymer aqueous solution, and the like.

[0011] Preferably, the titanium dioxide is rutile titanium dioxide, such as rutile titanium dioxide produced by the sulfate process, rutile titanium dioxide produced by the chloride process, or a combination thereof.

[0012] Preferably, the high hiding power effect filler is an effect filler with good coating dry hiding power, such as one or a combination of nano calcium, modified gray calcium powder, ultrafine calcined kaolin (such as 4000 mesh), etc.; the inert powder as a common filler is one or a combination of heavy calcium carbonate, talc, precipitated barium sulfate, etc.

[0013] Preferably, the interpenetrating network inorganic hybrid emulsion is one or a combination of inorganic nano-silicon hybrid polymer emulsion, core-shell structure inorganic lithium silicate modified acrylic emulsion, etc.

[0014] Preferably, the thickener is one or a combination of hydrophobically modified hydroxyethyl cellulose, xanthan gum, and modified inorganic gel.

[0015] Preferably, the antifreeze is an environmentally friendly antifreeze, such as glycerol, an environmentally friendly modified polyol antifreeze, and the like.

[0016] Preferably, the multifunctional pH regulator is one or a combination of quaternary ammonium compounds, dimethylethanolamine, 2-amino-2-methyl-1-propanol, and ammonia water.

[0017] Preferably, the film-forming aid is alcohol ester dodeca(2,2,4-trimethyl-1,3-pentanediol monoisobutyrate).

[0018] Preferably, the fungicide is a kassonite fungicide.

[0019] Preferably, the hydrophobic agent is one or a combination of wax emulsion, water-based silicone emulsion, and solvent-free silicone emulsion.

[0020] On the other hand, the present invention also provides a method for preparing an economical flexible scrub-resistant inorganic coating, the preparation method comprising the following steps:

[0021] S1: First, add deionized water, defoamer, wetting agent, dispersant, and thickener to a clean plastic container in sequence and disperse at low speed for 5 to 8 minutes. Then, add 1 / 3 of the formula amount of pH adjuster and disperse at high speed for 10 to 15 minutes to completely dissolve it into a uniform, particle-free solution.

[0022] S2: Add titanium dioxide, high hiding power filler, and common filler to the liquid prepared in step S1, disperse at high speed for 15 to 20 minutes, and detect the fineness to be less than 30 μm;

[0023] S3: Add interpenetrating network inorganic hybrid emulsion, antifreeze agent, film-forming aid, preservative and remaining pH adjuster to the slurry prepared in step S2 in sequence, stir thoroughly, test and discharge.

[0024] The rotation speed of the low-speed dispersion is 600-900 rpm / min, and the rotation speed of the high-speed dispersion is 1800-2500 rpm / min.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] (1) The film-forming material adopts interpenetrating network inorganic hybrid emulsion, which does not contain APEO and has ultra-low VOC content. Inorganic silicon and organic polymer form a semi-interpenetrating network structure (SIPN), which is synergistically enhanced to produce super scrub resistance.

[0027] ⑵The pigment and filler are made of rutile titanium dioxide, high hiding effect filler and inert powder, which partially replaces the expensive titanium dioxide. It has a high coating rate and a contrast ratio of more than 0.95, which far exceeds the requirements of relevant industry standards and greatly reduces the cost of raw material formula.

[0028] ⑶ The film-forming material is a hybrid of inorganic silicon nanoparticles and polymer emulsion. The steric hindrance of the macromolecular polymer emulsion greatly reduces the condensation probability of the inorganic silanol group, thereby reducing the internal stress generated by the inorganic film-forming material during the drying process. The flexibility of the coating is better than that of ordinary modified alkali metal silicate coatings and silica sol inorganic coatings, avoiding the risk of peeling and cracking of the coating.

[0029] ⑷Good color development, good color paste solubility, easy color adjustment, no floating color or blooming phenomenon.

[0030] ⑸The coating is heat-resistant and flame-retardant, and the fire protection grade can be described as Class A.

[0031] ⑹The coating is antibacterial and mildew-proof, and the decorative effect is long-lasting. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention and are not intended to limit the patent claims of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034]

[0035]

[0036] Operation process: First, add deionized water, defoaming agent, wetting agent, dispersant and thickener into a clean plastic container in sequence, disperse at low speed for 5 to 8 minutes, then add 1 / 3 of the formula amount of pH regulator, disperse at high speed for 10 to 15 minutes, and completely dissolve it into a uniform, particle-free solution.

[0037] Titanium dioxide, high hiding effect filler and ordinary filler are added to the prepared liquid in sequence, dispersed at high speed for 15 to 20 minutes, and the fineness is detected to be below 30 μm. Then, interpenetrating network inorganic hybrid emulsion, antifreeze agent, film-forming aid, preservative and the remaining pH adjuster are added to the prepared slurry in sequence, stirred thoroughly, tested and discharged.

[0038] The rotation speed of the low-speed dispersion is 600-900 rpm / min, and the rotation speed of the high-speed dispersion is 1800-2500 rpm / min.

[0039] Example 2

[0040]

[0041]

[0042] Operation process: First, add deionized water, defoaming agent, wetting agent, dispersant and thickener into a clean plastic container in sequence, disperse at low speed for 5 to 8 minutes, then add 1 / 3 of the formula amount of pH regulator, disperse at high speed for 10 to 15 minutes, and completely dissolve it into a uniform, particle-free solution.

[0043] Titanium dioxide, high hiding effect filler and ordinary filler are added to the prepared liquid in sequence, dispersed at high speed for 15 to 20 minutes, and the fineness is detected to be below 30 μm. Then, interpenetrating network inorganic hybrid emulsion, antifreeze agent, film-forming aid, preservative and the remaining pH adjuster are added to the prepared slurry in sequence, stirred thoroughly, tested and discharged.

[0044] The rotation speed of the low-speed dispersion is 600-900 rpm / min, and the rotation speed of the high-speed dispersion is 1800-2500 rpm / min.

[0045] Example 3

[0046]

[0047]

[0048] Operation process: First, add deionized water, defoaming agent, wetting agent, dispersant and thickener into a clean plastic container in sequence, disperse at low speed for 5 to 8 minutes, then add 1 / 3 of the formula amount of pH regulator, disperse at high speed for 10 to 15 minutes, and completely dissolve it into a uniform, particle-free solution.

[0049] Titanium dioxide, high hiding effect filler and ordinary filler are added to the prepared liquid in sequence, dispersed at high speed for 15 to 20 minutes, and the fineness is detected to be below 30 μm. Then, interpenetrating network inorganic hybrid emulsion, antifreeze agent, film-forming aid, preservative and the remaining pH adjuster are added to the prepared slurry in sequence, stirred thoroughly, tested and discharged.

[0050] The rotation speed of the low-speed dispersion is 600-900 rpm / min, and the rotation speed of the high-speed dispersion is 1800-2500 rpm / min.

[0051] The coating performance test is as follows:

[0052] Serial number project Technical requirements 1 2 3 4 1 Water resistance (240h) 168h No abnormalities No abnormalities No abnormalities No abnormalities 2 Alkali resistance (240h) 168h There are small bubbles No abnormalities No abnormalities No abnormalities 3 Cracking resistance / There are small cracks No cracks No cracks No cracks 4 Contrast ratio (white) 0.95 0.93 0.95 0.96 0.96 5 Mildew resistance / grade 0 1 0 0 0 6 Combustion performance / grade ≥A2 B1 A2 A1 A1 7 Washability / times ≥1000 3500 ＞10000 8000 6500

[0053] Note: Test method for coating crack resistance: Apply two coats of interior wall putty on asbestos-free fiber cement board, and maintain for 7 days at room temperature (23±2℃) and humidity 50±5℃. Polish the surface with 800-grit sandpaper, then apply with a long-haired roller. After drying at room temperature for 7 days, observe whether the coating has cracks.

[0054] It can be seen that the economical flexible scrub-resistant inorganic coating of the present invention has an alkali resistance of more than 240 hours, a scrub resistance of more than 1,000 times, a contrast ratio of >0.95, mildew resistance level 0, excellent coating crack resistance, high temperature resistance and flame retardancy, and a fire resistance level of A. The coating has high cost performance, and its comprehensive performance far exceeds its peers and relevant industry standards. It is very suitable for coating the interior walls of buildings such as subways, hospitals, schools, and government office buildings.

[0055] According to the description of the present invention, those skilled in the art can easily manufacture or use the economical flexible scrub-resistant inorganic coating of the present invention, and can produce the positive effects described in the present invention.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An economical, flexible, scrub-resistant inorganic coating, characterized by: The economical flexible scrub-resistant inorganic coating is composed of an interpenetrating network inorganic hybrid emulsion as a film-forming substance, titanium dioxide as a pigment, high hiding power fillers and ordinary fillers as fillers, and supplemented with a wetting agent, a dispersant, a defoaming agent, a thickener, an antifreeze agent, a film-forming aid, a hydrophobic agent, a multifunctional pH regulator, and an antibacterial agent.

2. An economical flexible scrub-resistant inorganic coating according to claim 1, characterized in that: Based on 100 parts by mass, the content of each component in the economical flexible scrub-resistant inorganic coating is:

3. An economical flexible scrub-resistant inorganic coating according to claim 1, characterized in that: The defoaming agent is a polymer composite mineral oil defoaming agent.

4. An economical flexible scrub-resistant inorganic coating according to claim 1, characterized in that: The wetting agent is an alkylphenol-free nonionic surfactant.

5. The economical flexible scrub-resistant inorganic coating according to claim 1, characterized in that: Titanium dioxide is rutile titanium dioxide.

6. An economical flexible scrub-resistant inorganic coating according to claim 1, characterized in that The high hiding power filler is one or a combination of nano calcium, modified gray calcium powder, ultrafine calcined kaolin, etc.

7. An economical flexible scrub-resistant inorganic coating is obtained according to claim 1, characterized in that: The inert powder is used as a common filler, and one or a combination of heavy calcium carbonate, talc, and precipitated barium sulfate is used.

8. The economical flexible scrub-resistant inorganic coating according to claim 1, characterized in that The interpenetrating network inorganic hybrid emulsion is one or a combination of inorganic nano-silicon hybrid polymer emulsion and core-shell structure inorganic lithium silicate modified acrylic emulsion.

9. The method for preparing an economical flexible scrub-resistant inorganic coating according to claim 1, characterized in that The multifunctional pH value regulator is one or a combination of quaternary ammonium compounds, dimethylethanolamine, 2-amino-2-methyl-1-propanol and ammonia water.

10. A method for preparing an economical flexible scrub-resistant inorganic coating according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: S1: First, add deionized water, defoamer, wetting agent, dispersant, and thickener to a clean plastic container in sequence and disperse at low speed for 5 to 8 minutes. Then, add 1 / 3 of the formula amount of pH adjuster and disperse at high speed for 10 to 15 minutes to completely dissolve it into a uniform, particle-free solution. S2: Add titanium dioxide, high hiding power filler, and common filler to the liquid prepared in step S1, disperse at high speed for 15 to 20 minutes, and detect the fineness to be less than 30 μm; S3: Add interpenetrating network inorganic hybrid emulsion, antifreeze agent, film-forming aid, preservative and remaining pH adjuster to the slurry prepared in step S2 in sequence, stir thoroughly, test and discharge.

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