Quick-drying waterborne epoxy floor coating and preparation method thereof

Abstract

The invention relates to a quick-drying waterborne epoxy floor coating and a preparation method thereof, and belongs to the technical field of coating preparation, the quick-drying waterborne epoxy floor coating is prepared by mixing a component A and a component B according to a mass ratio, the component A comprises the following components in percentage by mass: 30%-40% of a modified ternary water-based amine epoxy curing agent, 20%-30% of a graded pigment and filler system, 0.5%-2.5% of a double-effect anti-settling agent and 45%-50% of deionized water; and the component B comprises the following components in percentage by mass: 80-90% of bisphenol A type liquid epoxy resin, 8-12% of epoxy active diluent and 2-5% of modified compatibilizing resin. By adopting a modified ternary water-based amine epoxy curing agent compounding technology and combining precise preparation process control, the coating has the surface drying time of less than or equal to 60 minutes and the hard drying time of less than or equal to 24 hours at normal temperature, and still keeps the quick drying characteristic in a wide temperature range of 5-40 DEG C and a high-humidity environment, and the efficiency is remarkably improved compared with that of a traditional water-based epoxy coating; the construction period is obviously shortened and the engineering cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of coating preparation, and in particular to a quick-drying water-based epoxy floor coating and a preparation method thereof. Background Art

[0002] With growing environmental awareness and increasingly stringent environmental regulations, traditional solvent-based floor coatings are gradually being replaced by water-based floor coatings due to their high levels of volatile organic compounds (VOCs), which pose serious risks to the environment and human health during use. As a key branch of water-based floor coatings, water-based epoxy floor coatings, which use water as a dispersion medium, offer significant advantages such as being pollution-free, flame-retardant, explosion-proof, and allowing for easy cleaning of construction tools. This has become a research hotspot in the field of floor coatings.

[0003] However, existing water-based epoxy floor coatings still have many problems in practical applications. On the one hand, slow drying speed is one of its main drawbacks. The drying process of traditional water-based epoxy floor coatings depends on the volatilization of water and the progress of the curing reaction, and this process is greatly affected by factors such as environmental humidity and temperature. In a high humidity environment, water volatilization is hindered, resulting in a significant extension of the surface drying and actual drying time, seriously affecting construction efficiency. For example, during the rainy season in the south, the use of conventional water-based epoxy floor coatings for construction may take several days or even more than a week to completely dry, which greatly delays the project progress and increases construction costs.

[0004] Based on this, we proposed a quick-drying water-based epoxy floor coating and a preparation method thereof. Summary of the Invention

[0005] In order to solve the technical problem of slow drying speed of traditional water-based epoxy floor coatings, the present invention provides a quick-drying water-based epoxy floor coating and a preparation method thereof.

[0006] The present invention is implemented by the following technical solution: a fast-drying water-based epoxy floor coating, comprising a mixture of component A and component B according to a mass ratio. Component A comprises, by mass percentage, 30% to 35% of a modified ternary water-based amine epoxy curing agent, 25% to 30% of a graded pigment and filler system, 1% to 2% of a dual-effect anti-settling agent, and 34% to 44% of deionized water; and component B comprises, by mass percentage, 80% to 85% of a bisphenol A liquid epoxy resin, 10% to 12% of an epoxy reactive diluent, and 5% to 8% of a modified compatibilizing resin.

[0007] The modified ternary waterborne amine epoxy curing agent in component A is a mixture of modified fatty amine, modified cycloaliphatic amine, and waterborne polyamide, with a mass ratio of 3.2-4.2:3.0-4.0:2.5-3.0. This specific ratio complements the fast reaction of the modified fatty amine, the good adhesion and gloss of the modified cycloaliphatic amine, and the long pot life and flexibility of the waterborne polyamide. This allows the curing agent to enhance the overall performance of the coating while ensuring rapid drying, such as improving the hardness, adhesion, and flexibility of the coating, and reducing defects during the drying process.

[0008] The graded pigment and filler system consists of rutile titanium dioxide, nano-alumina, 800-1250 mesh quartz powder, and attapulgite in a mass ratio of 2-4:1-3:5-8:0.5-1.5, accounting for 13.8%-24.2%, 6.7%-20.7%, 33.3%-58.8%, and 3.3%-10.3%, respectively. This graded design utilizes pigments and fillers of varying particle sizes to form a tightly packed structure, with rutile titanium dioxide filling the gaps between the other fillers. This effectively increases the density of the coating, thereby enhancing its hardness, wear resistance, and hiding power. For example, in Example 1, rutile titanium dioxide (average particle size 0.3 μm), nano-alumina (average particle size 70 nm), 1000 mesh quartz powder, and attapulgite (average particle size 8 μm) are used and formulated in a mass ratio of 3:2:6:1. The coating has an average mass loss of only 0.04 g in the wear resistance test (GB / T1768-2006, 500 g / 500 revolutions, CS-10 grinding wheel), and the coating hardness is ≥4H, which meets the requirements for high-load floor use.

[0009] The dual-effect anti-settling agent in component A contains fumed silica and organic modified bentonite in a mass ratio of 1:1 to 2:1. The fumed silica is hydrophobic with a specific surface area of ≥200m 2 / g, and the organically modified bentonite is a quaternary ammonium salt-modified bentonite with an interlayer spacing of ≥1.5nm. The synergistic effect of the three-dimensional network structure formed by the fumed silica and the water-absorbing and swelling properties of the organically modified bentonite effectively prevents delamination and sedimentation of the coating during storage, ensuring the uniformity and stability of the coating and the consistency of its performance during application.

[0010] The preparation method of the quick-drying waterborne epoxy floor coating of the present invention comprises the following steps:

[0011] Preparation of Component A: First, add the modified ternary waterborne amine epoxy curing agent, graded pigment and filler system, dual-effect anti-settling agent, and pre-mixing defoamer to a high-speed disperser and pre-mix at 1000-1500 rpm for 5-10 minutes to form a uniform slurry. Then, add 50% of the total amount of deionized water and raise the temperature in two stages: first, raise the temperature to 30°C at a rate of 1-2°C / min and maintain it at that temperature for 5-10 minutes. Second, raise the temperature to 40-50°C at a rate of 0.5-1°C / min while dispersing at 2000-2500 rpm for 20-30 minutes, maintaining the system temperature at ≤45°C. Finally, add the remaining deionized water and the remaining composite defoamer, adjust the viscosity to 2000-5000 mPa·s at 800-1000 rpm, and filter to obtain Component A. This process promotes thorough mixing and reaction of the components by precisely controlling the stirring speed, temperature, and addition sequence, ensuring the stable performance of Component A.

[0012] Prepare Component B: Add bisphenol A liquid epoxy resin and epoxy reactive diluent to a reactor, heat to 60-80°C, and stir at 500-800 rpm for 1-2 hours. Cool to below 40°C, add modified compatibilizer resin and functional resin, and continue stirring for 20-30 minutes. Filter through a 120-mesh steel mesh to obtain a homogenized Component B. In this step, the initial heating and stirring promotes thorough mixing of the epoxy resin and reactive diluent, while the subsequent cooling and addition of the modified compatibilizer resin prevents the effects of high temperature on its structure and properties, thereby ensuring the quality of Component B.

[0013] Mixing and Application: Mix component A and component B in a mass ratio of 3:1 to 5:1 at 20°C to 35°C. Emulsify at a shear rate of 20 to 25 m / s for 5 to 10 minutes. Use a vacuum degassing device to control the air bubble content to ≤ 0.5% during mixing, and maintain a viscosity of 3000 to 4500 mPa·s after mixing. Allow to stand for 15 to 20 minutes to defoam, then apply to the substrate. Tack-free time at room temperature is ≤ 60 minutes, and through-dry time is ≤ 24 hours. Precisely control the mixing ratio, temperature, shear rate, and air bubble content to ensure good fluidity and uniformity during application, fast drying, and rapid formation of a high-performance coating film.

[0014] As a further optimization of the present invention, 0.2% to 0.7% of a composite defoamer is added to Component A. This defoamer is made by mixing mineral oil and silicone in a mass ratio of 1:1 to 1:2. This defoamer is added in two stages: 50% in the premixing stage and the remaining 50% in the final mix. This addition method and compounding ratio effectively eliminates bubbles generated during coating preparation and application, prevents defects such as pores and pinholes in the coating, and improves the smoothness and aesthetics of the coating.

[0015] As a further optimization scheme of the present invention, the epoxy reactive diluent in component B is C12-14 alkyl glycidyl ether or butyl glycidyl ether. Its addition not only reduces the viscosity of the epoxy resin and improves the mixing uniformity of components A and B, but also participates in the curing reaction and becomes part of the cross-linked network, thereby improving the flexibility and impact resistance of the coating, while reducing the release of VOCs in the coating and enhancing the environmental advantages.

[0016] As a further optimization of the present invention, the modified compatibilizing resin contains both a lipophilic structure comprising carbon chains and benzene rings and a hydrophilic structure comprising hydroxyl groups and ether bonds. Its epoxy equivalent is 300-400 g / mol, and the ether bond content in the hydrophilic structure accounts for 60%-80% of the total molar number of hydroxyl groups, with a hydroxyl value of 25-30 mgKOH / g. As an intermediate, its lipophilic structure is compatible with epoxy resin, and its hydrophilic structure is compatible with water-based amine curing agents. This improves the compatibility of components A and B, making component A easier to emulsify and disperse in component B. After emulsification, the epoxy resin particles are reduced in size, the surface curing rate is slowed, and the water-based amine curing agent molecules are fully diffused and cross-linked, forming a coating film with excellent overall performance.

[0017] As a further optimization scheme of the present invention, the modified compatibilized resin can introduce more functional groups, such as carboxyl groups, amino groups, etc., into its molecular structure through methods such as graft copolymerization, so as to further enhance its lipophilic and hydrophilic properties, improve the compatibility of components A and B, and promote a more complete curing reaction, thereby improving the comprehensive performance of the coating film, such as water resistance and chemical corrosion resistance.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention adopts modified ternary water-based amine epoxy curing agent compounding technology, combined with precise preparation process control, the coating has a surface drying time of ≤60 minutes at room temperature and a practical drying time of ≤24 hours, and still maintains fast drying characteristics in a wide temperature range of 5°C to 40°C and a high humidity environment. Compared with traditional water-based epoxy coatings, the efficiency is significantly improved, the construction period is significantly shortened, and the project cost is reduced.

[0020] 2. The graded pigment and filler system of the present invention (rutile titanium dioxide, nano-alumina, etc.) forms a tightly packed structure through a particle size gradient design, and is combined with a dual-effect anti-settling agent to improve the density of the coating film. It has good adhesion, impact resistance and chemical corrosion resistance, and meets the use requirements of high-load scenarios such as industrial plants and commercial floors.

[0021] 3. The present invention uses water as the dispersion medium, does not contain a large amount of volatile organic compounds (VOC content ≤ 50g / L, far below the national standard limit of 120g / L), and is combined with an epoxy reactive diluent that participates in the curing reaction, thereby reducing environmental hazards during construction and use, complying with environmental protection regulations, and having flame retardant and explosion-proof properties. Construction tools are easy to clean and highly safe. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0023] Example 1:

[0024] This embodiment provides a quick-drying water-based epoxy floor coating, which is composed of a mixture of component A and component B according to a mass ratio: component A contains the following components in the following mass percentages:

[0025] Among them, component A includes the following components by mass percentage:

[0026] Modified ternary waterborne amine epoxy curing agent: 30% to 35%;

[0027] Graded pigment and filler system: 25% to 30%;

[0028] Double-effect anti-settling agent: 1% to 2%;

[0029] Deionized water: 34% to 44%;

[0030] The fumed silica in the dual-effect anti-settling agent is hydrophobic, with a specific surface area of ≥200m / g; the organic modified bentonite is quaternary ammonium salt modified bentonite, with an interlayer spacing of ≥1.5nm.

[0031] 0.1% to 0.5% of a composite defoamer is also added to component A. The composite defoamer is a compound of mineral oil and silicone with a mass ratio of 1:1 to 1:2. The defoamer is added in two steps: 50% is added in the premixing stage, and the remaining 50% is added in the final mixing stage.

[0032] Component B includes the following components by mass percentage:

[0033] Bisphenol A liquid epoxy resin: 80% to 90%;

[0034] Epoxy reactive diluent: 8% to 12%;

[0035] Modified compatibilized resin: 2% to 5%;

[0036] The modified ternary waterborne amine epoxy curing agent in component A is a mixture of modified fatty amine, modified alicyclic amine and waterborne polyamide, with a mass ratio of 3.2-4.2:3.0-4.0:2.5-3.0;

[0037] Among them, the proportion of the graded pigment and filler system in component A (accounting for 25% to 30% of component A):

[0038] Rutile titanium dioxide: 15% to 20%;

[0039] Nano-alumina: 10% to 15%;

[0040] 800-1250 mesh quartz powder: 50%-60%;

[0041] Attapulgite: 5% to 10%;

[0042] The dual-effect anti-settling agent in component A comprises fumed silica and organic modified bentonite in a mass ratio of 1:1 to 2:1.

[0043] Component B contains the following components in percentage by mass:

[0044] Bisphenol A liquid epoxy resin: 80% to 85%;

[0045] Epoxy reactive diluent: 10% to 12%;

[0046] The epoxy reactive diluent is C12-14 alkyl glycidyl ether or butyl glycidyl ether;

[0047] Modified compatibilized resin: 5% to 8%;

[0048] The modified compatibilizing resin is an epoxy resin containing an oleophilic structure of a carbon chain and a benzene ring, and a hydrophilic structure of a hydroxyl group and an ether bond, and has a hydroxyl value of 25 to 30 mgKOH / g.

[0049] Rutile titanium dioxide (average particle size 0.3μm), nano-alumina (average particle size 70nm), 1000-mesh quartz powder, and attapulgite (average particle size 8μm) are mixed in a mass ratio of 3:2:6:1, accounting for 25% of component A. Rutile titanium dioxide accounts for 13.8% of the graded pigment and filler system, nano-alumina accounts for 6.7%, 1000-mesh quartz powder accounts for 58.8%, and attapulgite accounts for 3.3%.

[0050] This example performs a performance test on a quick-drying waterborne epoxy floor coating to verify whether its various performance indicators meet expectations.

[0051] 1. Drying performance test

[0052] Test conditions: temperature 25℃±2℃, relative humidity 60%±5%; substrate is concrete surface (moisture content ≤8%).

[0053]

[0054] Conclusion: The surface drying and through drying time of this coating are significantly shortened, and the efficiency is improved by more than 50% compared with traditional coatings.

[0055] 2. Abrasion resistance test (GB / T 1768-2006, 500g / 500 rpm, CS-10 grinding wheel)

[0056] Number of tests Mass loss (g) 1 0.04 2 0.03 3 0.05 average value 0.04g

[0057] Conclusion: The coating hardness is ≥4H, and the wear resistance is ≤0.05g, which meets the requirements for high-load floor use.

[0058] 3. Environmental performance test (GB / T 23986~2009)

[0059] Test items This coating (Example 1) National standard limit VOC content (g / L) 48 ≤120

[0060] Conclusion: VOC content is ≤50g / L, which is far lower than the national standard and meets environmental protection requirements.

[0061] 4. Environmental adaptability test

[0062] Test conditions Surface drying time (min) Drying time (h) 5℃, humidity 80% 75 28 25℃, humidity 60% 55 22 40℃, humidity 30% 45 18

[0063] Conclusion: Within a wide temperature range of 5℃~40℃, the coating can still maintain its fast drying characteristics.

[0064] Example 2:

[0065] Example 2 Based on the quick-drying waterborne epoxy floor coating in Example 1, a preparation method of a quick-drying waterborne epoxy floor coating is further proposed.

[0066] Step 1: Prepare component A

[0067] a. Premixing: Add the following components into a high-speed disperser according to their mass percentage:

[0068] Modified ternary waterborne amine epoxy curing agent: 35%, wherein the ratio is (modified fatty amine: modified alicyclic amine: waterborne polyamide = 3.5:3.5:2.8);

[0069] Graded pigment and filler system: 25%, wherein the ratio is (rutile titanium dioxide: nano-alumina: quartz powder: attapulgite = 3:2:6:1);

[0070] Double-effect anti-settling agent: 1.5% (fumed silica: organically modified bentonite = 1.5:1);

[0071] Composite defoamer: 0.3%, (mineral oil: silicone = 1:1.5);

[0072] The above components total 61.8%;

[0073] Premix at 1200 r / min for 8 minutes to form a uniform slurry.

[0074] b. High-speed dispersion: Add 18.95% deionized water and increase the temperature in two stages:

[0075] Stage 1: heating to 30°C at 1.5°C / min and maintaining constant temperature for 8 minutes;

[0076] The second stage: heat up to 45℃ at 0.8℃ / min, disperse at high speed of 2200r / min for 25 minutes, and control the temperature ≤45℃.

[0077] c. Adjust viscosity: Add 18.95% deionized water and 0.3% composite defoamer, stir at 900 r / min until the viscosity reaches 3500 mPa·s, and filter to obtain component A.

[0078] Step 2: Prepare component B

[0079] a. Resin mixing: bisphenol A liquid epoxy resin (85%) and C12-14 alkyl glycidyl ether (10%) were added to the reactor, heated to 70°C, and stirred at 600 r / min for 1.5 hours.

[0080] b. Adding compatibilizing resin: Cool to 35°C, add 5% of modified compatibilizing resin (epoxy equivalent 350 g / mol, ether bond ratio 70%), and continue stirring for 25 minutes.

[0081] c. Filtration: Filter through a 120-mesh steel mesh to obtain homogeneous component B.

[0082] Step 3: Mixing and Application

[0083] a. Emulsification and mixing: Mix component A and component B in a mass ratio of 4:1, emulsify at 25°C and a shear rate of 22 m / s for 8 minutes. After vacuum degassing, the bubble content of the system is ≤0.4%, and the viscosity is stable at 3800 mPa·s.

[0084] b. Coating and drying: After standing and defoaming for 18 minutes, apply to the concrete base surface (moisture content ≤ 8%).

[0085] Surface drying time: 55 minutes at room temperature (25°C, humidity 60%);

[0086] Drying time: 22 hours.

[0087] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A quick-drying waterborne epoxy floor coating, characterized in that: Mix component A and component B according to mass ratio Composition: Component A includes the following components by mass percentage: Modified ternary waterborne amine epoxy curing agent: 30% to 35%; Graded pigment and filler system: 25% to 30%; Double-effect anti-settling agent: 1% to 2%; Deionized water: 34% to 44%; Component B includes the following components by mass percentage: Bisphenol A liquid epoxy resin: 80% to 85%; Epoxy reactive diluent: 10% to 12%; Modified compatibilized resin: 5% to 8%; The modified ternary waterborne amine epoxy curing agent in component A is a mixture of modified fatty amine, modified alicyclic amine and waterborne polyamide, with a mass ratio of 3.2-4.2:3.0-4.0:2.5-3.0; Among them, the formula ratio of the graded pigment and filler system in component A includes: Rutile titanium dioxide: 15% to 20%; Nano-alumina: 10% to 15%; 800-1250 mesh quartz powder; 50%-60% Attapulgite: 5% to 10%; The dual-effect anti-settling agent in component A comprises fumed silica and organic modified bentonite in a mass ratio of 1:1 to 2:

1. The epoxy reactive diluent is C12-14 alkyl glycidyl ether or butyl glycidyl ether; The modified compatibilizing resin is an epoxy resin containing both a carbon chain and a benzene ring lipophilic structure and a hydroxyl group and an ether bond hydrophilic structure, and has a hydroxyl value of 25 to 30 mgKOH / g.

2. A quick-drying waterborne epoxy floor coating as claimed in claim 1, characterized in that: The average particle size of the rutile titanium dioxide is 0.2 to 0.5 μm; The average particle size of the nano-alumina is 50 to 100 nm; The average particle size of the 800-1250 mesh quartz powder is 15-25 μm; The average particle size of the attapulgite is 5 to 10 μm.

3. A quick-drying waterborne epoxy floor coating according to claim 1, characterized in that: The epoxy equivalent of the modified compatibilized resin is 300-400 g / mol, and the ether bond content in the hydrophilic structure thereof accounts for 60%-80% of the total molar number of hydroxyl groups.

4. A quick-drying waterborne epoxy floor coating as claimed in claim 1, characterized in that: The fumed silica in the dual-effect anti-settling agent is hydrophobic, with a specific surface area of ≥200 m2 / g; the organic modified bentonite is quaternary ammonium salt modified bentonite, with an interlayer spacing of ≥1.5 nm.

5. A quick-drying waterborne epoxy floor coating as claimed in claim 1, characterized in that: 0.2% to 0.7% of a composite defoamer is also added to the A component, wherein the composite defoamer is a compound of mineral oil and silicone, with a mass ratio of 1:1 to 1:2; The defoamer is added in two steps: 50% is added in the pre-mixing stage, and the remaining 50% is added in the final mixing stage.

6. A method for preparing a quick-drying waterborne epoxy floor coating, for preparing a quick-drying waterborne epoxy floor coating according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following steps: Step 1: Prepare component A a. Add the modified ternary waterborne amine epoxy curing agent, graded pigment and filler system (including rutile titanium dioxide, nano-alumina, 800-1250 mesh quartz powder, attapulgite), and dual-effect anti-settling agent (including fumed silica and organic modified bentonite) into a high-speed disperser. Add the defoamer at the same time during the pre-mixing stage and pre-mix at 1000-1500 r / min for 5-10 minutes. b. Add 50% of the total amount of deionized water, raise the temperature to 40-50°C, disperse at a high speed of 2000-2500r / min for 20-30 minutes, and control the system temperature to ≤45°C; c. Add the remaining deionized water and the remaining composite defoamer, adjust the viscosity to 2000-5000 mPa·s at 800-1000 r / min, and filter to obtain component A; Step 2: Prepare component B a. Add bisphenol A liquid epoxy resin and epoxy reactive diluent to the reactor, heat to 60-80°C, and stir at 500-800 r / min for 1-2 hours; b. Cool down to below 40°C, add modified compatibilizing resin and functional resin, and continue stirring for 20 to 30 minutes; c. Filter through a 120-mesh steel mesh to obtain homogeneous component B; Step 3: Mixing and Application a. Mix component A and component B in a mass ratio of 3:1 to 5:1 and emulsify at a shear rate of 20 to 25 m / s for 5 to 10 minutes; b. After standing and defoaming for 15 to 20 minutes, apply it to the base surface. The surface drying time at room temperature is ≤ 60 minutes, and the actual drying time is ≤ 24 hours.

7. A method for preparing a quick-drying waterborne epoxy floor coating as claimed in claim 6, characterized in that: The heating process of step b in step 1 is divided into two stages: in the first stage, the temperature is raised to 30°C at a rate of 1-2°C / min and kept constant for 5-10 minutes; in the second stage, the temperature is raised to the target temperature of 40-50°C at a rate of 0.5-1°C / min, and the temperature fluctuation range of the whole system is ≤±2°C.

8. A method for preparing a quick-drying waterborne epoxy floor coating according to claim 6, characterized in that: In step 3 a, the mixing temperature of component A and component B is 20° C. to 35° C., a vacuum degassing device is used during the mixing process to control the bubble content of the system to ≤0.5%, and the viscosity of the coating after mixing is maintained at 3000 to 4500 mPa·s.

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