Water-based epoxy backwater surface deodorizing waterproof coating, preparation method and application thereof

Abstract

This invention relates to a water-based epoxy back-side odor-free waterproof coating, its preparation method, and its application, belonging to the field of water-based coating technology. The water-based epoxy back-side odor-free waterproof coating comprises component A and component B. Component A includes a water-based epoxy curing agent, dispersant, defoamer, thickener, abrasion-resistant powder, a mixture of pigments and fillers, water, anti-settling agent, wetting and leveling agent, scratch-resistant agent, and bactericide. Component B includes a water-based epoxy emulsion, a silane coupling agent, and a toughening agent. The water-based epoxy curing agent is a modified amine curing agent, comprising epoxy resin E51, polyethylene glycol diglycidyl ether, aliphatic polyamine, reactive emulsifier, end-capping agent, and propylene glycol methyl ether. This water-based epoxy back-side odor-free waterproof coating differs from conventional waterproof coatings; it is specifically designed for humid environments, can be applied and cured on damp surfaces, is easy to apply, achieves true back-side waterproofing, and is not only odor-free and environmentally friendly but also possesses antibacterial and antifungal properties.

Description

Technical Field

[0001] This invention belongs to the field of water-based coating technology, specifically relating to a water-based epoxy backwater-side odor-free waterproof coating, its preparation method, and its application. Background Technology

[0002] In building structures, the side that is in direct contact with water is called the "water-facing side," and the opposite side is called the "water-repellent side." Building waterproofing materials are a type of protective material used in buildings and structures. Their main functions are moisture and leak prevention, protecting the building structure from moisture erosion and damage.

[0003] Moisture-proof: refers to preventing groundwater, water vapor, or corrosive substances such as salts in the foundation from penetrating into the interior of the building.

[0004] Leak prevention: refers to preventing rainwater, snow water, etc. from seeping into the interior of a building from the outside through the roof, walls, or joints of concrete components, as well as preventing water from leaking out of water storage structures.

[0005] Common waterproofing measures currently include:

[0006] Inorganic rigid waterproof coatings: can form a protective layer on the building surface, but they are heavy, limited by the construction area structure, non-permeable, and easily fail due to mechanical vibration and other factors.

[0007] Waterproof coatings: They have a certain degree of permeability, but they are not very effective at sealing capillaries or larger cracks in building structures, and have poor long-term water resistance.

[0008] Waterproof membrane coating: Usually made of modified bitumen or polymer membrane, it has good elasticity and toughness. However, it is an elastomer and has insufficient adhesion to the substrate, easily forming a "two-layer" structure, leading to delamination.

[0009] Waterproof coatings include polymer cement, acrylic, and polyurethane waterproof coatings. These high-molecular organic polymer materials have good film-forming and adhesion properties, but they also have some drawbacks, such as high thermoplasticity, poor solvent resistance, and insufficient strength and weather resistance, which directly affect the performance and service life. Furthermore, they need to be applied to a dry substrate; otherwise, the coating cannot bond well with the substrate, and the film cannot form. While these coatings address the inherent shortcomings of roll materials, their own defects prevent them from being applied to the "back side" of the surface.

[0010] These materials work well on the water-facing side, but their waterproofing effect is significantly reduced when applied to the back side. Furthermore, waterproof coatings need to have good adhesion, be able to adapt to both dry and damp substrates, and possess acid and alkali resistance, antibacterial and antifungal properties, as well as being environmentally friendly.

[0011] Currently, existing waterproof coatings for the back side still suffer from problems such as low bonding strength with the substrate, deformation and cracking, inability to withstand high water pressure on the back side, poor water resistance, low-temperature film formation, and weak temperature adaptability. The resulting aging, cracking, breakage, and deformation also urgently need to be addressed. In addition, many existing materials also have problems such as strong odor, high toxicity, and poor environmental performance.

[0012] Therefore, there is a current need to develop an environmentally friendly waterproof coating that can resist backwater seepage pressure, has excellent impermeability, strong adhesion, and durability. Summary of the Invention

[0013] The purpose of this invention is to address the problems existing in the prior art and provide a water-based epoxy back-side water-resistant, odor-free, and waterproof coating, its preparation method, and its application. This water-based epoxy back-side water-resistant, odor-free, and waterproof coating differs from conventional waterproof coatings; it is specifically designed for humid environments, can be applied and cured on damp surfaces, is easy to apply, achieves true back-side waterproofing, and is not only odor-free and environmentally friendly but also possesses antibacterial and antifungal properties.

[0014] The first objective of this invention is:

[0015] A water-based epoxy backwater-side odor-free waterproof coating is provided, comprising component A and component B, wherein the weight ratio of component A to component B is 1 to 5:1.

[0016] Component A comprises the following raw materials in weight percentages:

[0017] The composition includes 20-50% water-based epoxy curing agent, 0.5-2% dispersant, 0.1-2% defoamer, 0.1-2% thickener, 10-20% abrasion-resistant powder, 10-40% pigment and filler mixture, 10-40% water, 0.01-2% anti-settling agent, 0.01-2% wetting and leveling agent, 0.01-2% scratch-resistant agent, and 0.01-2% bactericide. All components are prepared to be 100%.

[0018] The water-based epoxy curing agent is a modified amine curing agent, comprising:

[0019] Epoxy resin E51, polyethylene glycol diglycidyl ether, aliphatic polyamine, reactive emulsifier, end-capping agent and propylene glycol methyl ether (PM);

[0020] The weight ratio of epoxy resin E51: polyethylene glycol diglycidyl ether: aliphatic polyamine is 1-3:2-4:10-15.

[0021] The amount of the reactive emulsifier used is 0.5% to 2% of the weight of the aliphatic polyamine;

[0022] The amount of the capping agent used is 1-10% of the weight of the aliphatic polyamine;

[0023] The amount of propylene glycol methyl ether (PM) used is 5% to 12% of the weight of epoxy resin E51;

[0024] The reactive emulsifiers include: sodium acrylamide isopropyl sulfonate and fatty alcohol polyoxyethylene ether;

[0025] The weight ratio of sodium acrylamide isopropyl sulfonate to fatty alcohol polyoxyethylene ether is 1-5:1-10.

[0026] The terminators include: o-toluene glycidyl ether (CGE) and C12-14 alkyl glycidyl ether (AGE);

[0027] The weight ratio of o-toluene glycidyl ether (CGE) to C12-14 alkyl glycidyl ether (AGE) is 1-5:1-10;

[0028] The aliphatic polyamine is one or a combination of several of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, and diethylaminopropylamine;

[0029] The wear-resistant powder is one or a combination of basalt flakes, glass powder, and barium sulfate.

[0030] The pigment and filler mixture comprises: titanium dioxide, quartz powder, dispersant and silane coupling agent, wherein the weight ratio of titanium dioxide:quartz powder:dispersant:silane coupling agent is 1-2:1-2:0.5:0.1-0.5;

[0031] The titanium dioxide mentioned is titanium dioxide with aluminum oxide or chromium oxide coated on the surface, wherein the weight percentage content of titanium dioxide is 94-95.5%, the oil absorption is 17-20g / 100g, and the whiteness is ≥93%.

[0032] The quartz powder mentioned is quartz powder with a SiO2 content of ≥99%;

[0033] The pigment and filler mixture is first mixed and pre-prepared into a pigment and filler polymer slurry before use;

[0034] Component B comprises the following raw materials in weight percentages:

[0035] The composition consists of 20-90% aqueous epoxy emulsion, 1-10% silane coupling agent, and 1-20% toughening agent, with all components prepared to be 100%.

[0036] A further optimization of the water-based epoxy backwater-side odor-free waterproof coating of the present invention is as follows:

[0037] The preparation of the pigment and filler polymer slurry includes the following steps:

[0038] Titanium dioxide, quartz powder, dispersant and silane coupling agent were loaded into a closed ball mill reactor and ball-milled for 16 hours to prepare a white sludge-like pigment and filler polymer slurry with a particle size of 40-80 nm.

[0039] A further optimization of the water-based epoxy backwater-side odor-free waterproof coating of the present invention is as follows:

[0040] The glass powder is one or a combination of several of the following: spherical powders made from metal oxides: silicon oxide, aluminum oxide, iron oxide, and sodium oxide.

[0041] A further optimization of the water-based epoxy backwater-side odor-free waterproof coating of the present invention is as follows:

[0042] The water-based epoxy curing agent comprises the following preparation steps:

[0043] S1. Polyethylene glycol diglycidyl ether (PEGGE), epoxy resin E51 and propylene glycol methyl ether (PM) are placed into a three-necked flask; the mixture is heated in an oil bath to 80°C, and the pressure inside the flask is maintained at 0.1 kPa. After vacuuming for 0.5 to 3 hours, the mixture is cooled to room temperature to obtain the treated oligomer.

[0044] S2. Take an aliphatic polyamine, stir and heat it to 40-70°C under nitrogen protection, and start adding the oligomer pretreated in step S1 at this temperature. The addition should be completed within 2 hours. After the addition is completed, keep the reaction at the temperature for a certain period of time. After the reaction is completed, distill under reduced pressure until all the solvent is evaporated to obtain the modified chain extension product.

[0045] S3. After testing the amine value of the modified chain extension reaction product obtained in step S2 and finding no significant decrease, stop the reaction. Continue to add the reactive emulsifier and end-capping agent dropwise at 80°C, controlling the addition to be completed within 2 hours. Finally, slowly add an appropriate amount of deionized water, stir for 1 hour, adjust the solid content to 55-60%, and after the reaction is completed, distill under reduced pressure, cool, and filter to obtain the water-based epoxy curing agent.

[0046] A further optimization of the water-based epoxy backwater-side odor-free waterproof coating of the present invention is as follows:

[0047] It includes one or more of the following features:

[0048] The wear-resistant powder is a combination of basalt flakes and glass powder in a weight ratio of 1:2.

[0049] The dispersant is one or a combination of several of the following: BYK-181, BYK-190, DIS-188A, and SN-5027;

[0050] The defoamer includes at least one of polymer composite mineral oil defoamer and organosilicon defoamer;

[0051] The defoamer is one or a combination of several of the following: BYK-019, BYK-1711, TEGO-901W, FoamStar ST2410AG, and BYK-024;

[0052] The thickener is organically modified lithium montmorillonite clay with a particle size of 80% ≤ 125 μm. It is a white powder with low shear viscosity, which can prevent hard precipitation of pigments and fillers, reduce phase separation, and impart reproducible thixotropic flowability.

[0053] The anti-settling agent is a modified polyurea solution, preferably BYK-420 from BYK Chemicals.

[0054] The wetting and leveling agent includes at least one of silicone-based and acrylic-based agents;

[0055] The preferred wetting and leveling agent is one or a combination of several of the following: BYK-346, BYK-333, TEGO-4100, TEGOWET-270, and EFKA-3772.

[0056] The anti-scratch additive is one or a combination of several of the following: DC51, wax emulsion, and wax powder; preferably, it is a wax emulsion.

[0057] The bactericide mentioned is one or a combination of several of LPC5, LXE, BIOX520W, and BIOXABZ;

[0058] The aqueous epoxy emulsion is one or a combination of several of Dow AEH-20, Dow DER WB3002, and Handai HDE8370-WB;

[0059] The preferred waterborne epoxy emulsion is mainly a modified epoxy resin, which is used as a binder component. By grafting and modifying the epoxy resin and introducing low surface energy polysiloxane through silane coupling agents, the modified epoxy emulsion prepared by internal emulsification improves the contact angle with water, greatly reduces the adhesion of dust, bacteria and other impurities to the coating film, and further enhances the wear resistance and scratch resistance of the coating film.

[0060] The silane coupling agent is one or a combination of several silane coupling agents containing epoxy groups or diamino groups;

[0061] The toughening agent is one or a combination of several of the following: dipropylene glycol butyl ether, diisononyl cyclohexane 1,2-dicarboxylate, and benzyl alcohol.

[0062] The second objective of this invention is:

[0063] A method for preparing the aforementioned water-based epoxy backwater-side odor-free waterproof coating is provided, comprising the following preparation steps:

[0064] S1. Preparation of Component A: Add the water-based epoxy curing agent to the deionized water under stirring according to the proportion, then add the thickener, dispersant, defoamer, anti-scratch agent, bactericide, and wetting and leveling agent. After dispersing evenly, add the wear-resistant powder and pigment and filler mixture, grind to the appropriate fineness, add the remaining deionized water, stir evenly, add the anti-settling agent to adjust the appropriate viscosity, and obtain Component A;

[0065] S2. Preparation of component B: The aqueous epoxy emulsion, toughening agent and silane coupling agent are stirred evenly according to the proportion to obtain component B;

[0066] S3. Add component B to component A, stir and mix in proportion, and react to obtain the water-based epoxy backwater-side odor-free waterproof coating.

[0067] The third objective of this invention is:

[0068] A method for applying the aforementioned water-based epoxy backwater-side odor-free waterproof coating is provided:

[0069] Apply the water-based epoxy backwater-side odor-free waterproof coating directly to the surface of uncured plastic concrete by roller / spray / brush. After it dries naturally for one week, proceed with routine subsequent treatments.

[0070] The fourth objective of this invention is:

[0071] A coating is provided, which is a coating obtained by applying the aforementioned water-based epoxy back-side deodorizing and waterproof coating onto a substrate.

[0072] The fifth objective of this invention is:

[0073] An article is provided comprising a substrate and a coating obtained by applying the aforementioned coating onto the substrate, wherein the substrate includes, but is not limited to, concrete.

[0074] The sixth objective of this invention is:

[0075] An application of the aforementioned water-based epoxy backwater-side odor-free waterproof coating is provided, characterized in that:

[0076] It includes the following steps:

[0077] A. Substrate preparation: The substrate surface to be constructed shall be leveled, dried and cleaned;

[0078] B. Applying putty: Add quartz powder to the water-based epoxy backwater-side odor-free waterproof coating and apply several coats of putty to the base surface. After curing, a putty layer is formed.

[0079] C. Apply sealing primer: Use the water-based epoxy backwater-side odor-free waterproof coating as a sealing and alkali-resistant primer to apply to the surface of the putty layer, and form a primer layer after curing;

[0080] D. Application coating: Apply the water-based epoxy backing water-resistant and odorless waterproof coating evenly over the primer layer.

[0081] The water-based epoxy backwater-side odor-free waterproof coating of the present invention has the following technical features and advantages:

[0082] 1. The water-based epoxy back-side odorless waterproof coating of the present invention is different from conventional waterproof coatings. It is specially designed for humid environments, can be applied and cured on damp surfaces, is easy to apply, and achieves true back-side waterproofing. It is not only odorless and environmentally friendly, but also has antibacterial and anti-mildew properties.

[0083] 2. The water-based epoxy back-side odor-free waterproof coating of the present invention achieves a significant improvement in back-side waterproofing effect. Through linear cross-linking and polymerization of epoxy resin and curing agent into a three-dimensional network structure, it provides high film density and high film hardness. The epoxy groups have chemical groups such as ether bonds and hydroxyl groups, providing high adhesion. Epoxy resin and toughening agent endow the coating with excellent toughness, improve the flexibility of the paint film, and make the paint film have better physical and mechanical properties.

[0084] 3. The water-based epoxy backwater-side odor-free waterproof coating of this invention uses a modified amine curing agent. This modified amine curing agent involves 100% addition to small molecule amines, ensuring the product has very low vapor pressure and free amine content. Long-chain water-soluble curing agent molecules overlap between nanoparticles, enhancing penetration; this enhanced cross-linking reaction through penetration achieves the ability to cure under water conditions; flexible molecular design increases dispersion, and nano-sized emulsified particles improve compatibility, resulting in a denser film.

[0085] 4. The water-based epoxy back-side deodorizing waterproof coating of the present invention specifically incorporates a silane coupling agent and a toughening agent in its formulation to enhance the interfacial fusion between the coating and the substrate. This combination not only improves the coating's permeability and flexibility but also allows the groups in the coating to bond tightly with the substrate or underlying material. Through synergistic action with epoxy resin, strong chemical bonds are formed at the bonding interface, thereby significantly improving the bonding strength.

[0086] Simultaneously, silane can chemically react with moisture on the substrate surface or in the air to form a water-repellent layer, effectively inhibiting moisture penetration and providing additional waterproof protection for the substrate. Through this innovative formulation design, the product of this invention not only has strong adhesion but also excellent waterproof performance.

[0087] 5. The water-based epoxy backwater-side odor-free waterproof coating of the present invention is a water-based coating product with significant environmental protection characteristics. Its VOC content is greatly reduced, thereby reducing the impact on human health and the environment.

[0088] The product of this invention is highly safe and environmentally friendly, and is suitable for various environments, including home decoration and industrial coating protection, making it an ideal multi-functional coating solution.

[0089] In addition, energy conservation was achieved during the production process. Detailed Implementation

[0090] To make the application, technical solution, and advantages of this invention clearer, the invention is described in detail with reference to specific embodiments. It should be understood that the embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Any simple improvements to the preparation method of this invention based on the inventive concept fall within the scope of protection of this invention.

[0091] The following are the technical solutions of the present invention and the raw materials that can be used in the embodiments, as shown in Table 1.

[0092] Table 1

[0093]

[0094]

[0095] Example 1

[0096] A method for preparing a water-based epoxy backwater-side odor-free waterproof coating includes the following preparation steps:

[0097] S1. Preparation of Component A: Add the water-based epoxy curing agent to the deionized water under stirring according to the proportion, then add the thickener, dispersant, defoamer, anti-scratch agent, bactericide, and wetting and leveling agent. After dispersing evenly, add the wear-resistant powder and pigment and filler mixture, grind to the appropriate fineness, add the remaining deionized water, stir evenly, add the anti-settling agent to adjust the appropriate viscosity, and obtain Component A;

[0098] S2. Preparation of component B: The aqueous epoxy emulsion, toughening agent and silane coupling agent are stirred evenly according to the proportion to obtain component B;

[0099] S3. Add component B to component A, stir and mix in proportion, and react to obtain the water-based epoxy backwater-side odor-free waterproof coating.

[0100] in:

[0101] The water-based epoxy curing agent is a modified amine curing agent, comprising:

[0102] Epoxy resin E51, polyethylene glycol diglycidyl ether, aliphatic polyamine, reactive emulsifier, end-capping agent and propylene glycol methyl ether (PM);

[0103] The weight ratio of epoxy resin E51: polyethylene glycol diglycidyl ether (PEGGE): aliphatic polyamine is 1:4:10.

[0104] The amount of the reactive emulsifier used is 1.56% of the weight of the aliphatic polyamine;

[0105] The amount of the capping agent used is 5% of the weight of the aliphatic polyamine;

[0106] The amount of propylene glycol methyl ether (PM) used is 5% of the weight of epoxy resin E51;

[0107] The reactive emulsifiers include: sodium acrylamide isopropyl sulfonate and fatty alcohol polyoxyethylene ether;

[0108] The weight ratio of sodium acrylamide isopropyl sulfonate to fatty alcohol polyoxyethylene ether is 3:7.

[0109] The terminators include: o-toluene glycidyl ether (CGE) and C12-14 alkyl glycidyl ether (AGE);

[0110] The weight ratio of o-toluene glycidyl ether (CGE) to C12-14 alkyl glycidyl ether (AGE) is 2:1.

[0111] The water-based epoxy curing agent comprises the following preparation steps:

[0112] S1. Add 80.8 g of a mixture of polyethylene glycol diglycidyl ether (PEGGE), epoxy resin E51 and propylene glycol methyl ether (PM) into a three-necked flask; heat in an oil bath, raise the temperature to 80°C, maintain the pressure inside the flask at 0.1 kPa, evacuate for 0.5 to 3 hours, and then cool to room temperature to obtain the treated oligomer.

[0113] S2. Take 160g of aliphatic polyamine (ethylenediamine:hexamethylenediamine:diethylenetriamine weight ratio = 5:2:3), stir and heat to 40-70℃ under nitrogen protection, and start adding the oligomer pretreated in step S1 dropwise at this temperature, controlling the addition to be completed within 2 hours; after the addition is completed, keep the reaction at the temperature for a certain time, and after the reaction is completed, distill under reduced pressure until the solvent is completely evaporated to obtain the modified chain extension reaction product;

[0114] S3. After testing the amine value of the modified chain extension product obtained in step S2 and finding no significant decrease, stop the reaction. Under 80°C, continue to add 2.5g of reactive emulsifier and 8g of end-capping agent dropwise, controlling the addition to be completed within 2 hours. Finally, slowly add an appropriate amount of deionized water, stir for 1 hour, adjust the solid content to 55-60%, and after the reaction is completed, distill under reduced pressure, cool, and filter to obtain the water-based epoxy curing agent.

[0115] The preparation of the pigment and filler polymer slurry includes the following steps:

[0116] Titanium dioxide, quartz powder, dispersant and silane coupling agent were loaded into a closed ball mill reactor and ball-milled for 16 hours to prepare a white sludge-like pigment and filler polymer slurry with a particle size of 40-80 nm.

[0117] The pigment and filler mixture includes: titanium dioxide R996, quartz powder 706, dispersant BYK-190 and silane coupling agent 0FS-6020, with a weight ratio of titanium dioxide:quartz powder:dispersant:silane coupling agent of 2:1:0.5:0.1.

[0118] Examples 2 and 3 are prepared in the same way as Example 1, with the main difference being that the composition and amount of some raw materials are different.

[0119] The composition and preparation method of Comparative Example 1 are basically the same as those of Example 1. The main difference is that Comparative Example 1 uses a conventional water-based epoxy curing agent instead of the modified epoxy curing agent used in Example 1.

[0120] Comparative Example 2 and Example 2 have basically the same composition and preparation method. The main difference is that Comparative Example 2 uses conventional pigments and fillers, titanium dioxide and quartz powder, instead of the pigment and filler mixture used in Example 1.

[0121] The composition and preparation method of Comparative Example 3 are basically the same as those of Example 3. The main difference is that Comparative Example 3 uses ordinary wear-resistant powder instead of the wear-resistant powder used in Example 3.

[0122] Table 2 shows the composition (by weight %) of each specific component in the embodiments.

[0123]

[0124]

[0125] The products obtained in the examples and comparative examples were tested for wear resistance and pencil hardness according to JC / T 2217-2014(2017) "Epoxy Resin Waterproof Coatings" and according to the technical requirements of S-type in GB / T 22374-2018 Floor Coating Materials; the odor level and odor dissipation time were tested according to Q / LBZS 09-2021 Odorless Interior Wall Latex Paint (Low Odor Interior Wall Latex Paint). The test results are shown in Table 5.

[0126] The Q / LBZS 09-2021 Odorless Interior Wall Latex Paint (Low Odor Interior Wall Latex Paint) is tested for odor level and odor dissipation time; the technical requirements are as follows:

[0127] 1) The physical properties of the odor-free products meet the requirements specified in GB / T9756-2018 for the corresponding products;

[0128] 2) The limits for harmful substances in odor-free products should comply with the requirements for interior wall coatings in Table 1 of GB18582-2020;

[0129] 3) The odor evaluation performance requirements for odor-free latex paint (low-odor latex paint) shall meet the requirements of Table 3;

[0130] Table 3 Odor Requirements

[0131] project Require Odor level, Level ≤ 2 Odor dissipation time, hr≤ 8

[0132] Odor dissipation time test method: The test sample is applied to the substrate and placed in a glass / stainless steel odor test chamber with a length of 0.5m, a width of 0.4m, and a height of 0.5m. With the test chamber door, odor assessment chamber door, and ventilation valve all open, forced ventilation is carried out for 10 minutes using a fan, then all doors are closed, and the odor test chamber is sealed for 45 minutes. The odor test chamber door is then opened, and the odor testing team evaluates the odor within 5 minutes. Odor comparisons are performed every hour, and the odor level assessment is shown in Table 4.

[0133] Table 4 Odor Levels

[0134] Level Status Description Level 1 Odorless and undetectable Level 2 The odor is faint, but perceptible. Level 3 It has an odor, but no strong discomfort. Level 4 Strong unpleasant odor Level 5 It has an irritating and unpleasant odor.

[0135] Table 5 Comparison of results between the examples and the comparative examples.

[0136]

[0137]

[0138] Based on the above comparative analysis:

[0139] The water-based epoxy backwater-side odor-free waterproof coating prepared according to the embodiments of the present invention has properties that far exceed the national standards, with embodiment 3 showing the best performance.

[0140] 1. As can be seen from Examples 1 to 3, the water-based epoxy back-side odor-free waterproof coating prepared by the present invention is effective and has good coating impermeability pressure. Its performance is better than that of Comparative Examples 1 to 3. It can achieve good impermeability pressure on both the water-facing and back-side coatings. The impermeability pressure of the back-side coating is greater than 1.0 MPa. At the same time, the odor level can reach the odor-free level. No free formaldehyde and benzene compounds are detected. It has excellent environmental performance and is a true water-based epoxy back-side odor-free waterproof coating.

[0141] 2. Example 3 adjusted the amount of modified amine curing agent based on Examples 1 and 2, optimized the optimal reaction ratio of epoxy resin and modified amine curing agent, and found a better addition ratio of toughening agent and silane coupling agent to enhance the interfacial fusion between the coating and the substrate. This significantly improved various properties such as pencil hardness, abrasion resistance, dry, wet, water immersion, and heat treatment adhesion strength. The modified amine curing agent prepared in this invention can effectively balance rigidity and flexibility, and can linearly crosslink and polymerize with epoxy resin to form a three-dimensional network structure. Its abrasion resistance and pencil hardness are superior to those of Comparative Examples 1 to 3.

[0142] 3. In Comparative Example 2, only conventional pigments and fillers, titanium dioxide and quartz powder, were used, which could not achieve the effect of the modified pigment and filler mixture used in Example 2. The system had high porosity, and its hardness and impermeability were significantly lower than those of Example 2. In Comparative Example 3, only conventional wear-resistant powder was used, which significantly reduced the density of the coating, had poor material adhesion, and had a poor filling effect on capillary pores, resulting in a reduction in various properties. This affected the mechanical properties of the coating, and its wear resistance, pencil hardness, and impermeability pressure resistance on the water-facing and back-facing sides were significantly lower than those of Example 3.

[0143] The water-based epoxy backwater-side odor-free waterproof coating prepared by this invention pre-treats the pigments and fillers, which can effectively improve the dispersion of fillers and increase the density of the coating compared with conventional dispersed pigments and fillers. In addition, high-hardness wear-resistant basalt flakes and glass powder are used to fill the pores of the coating film, forming an effective water-repellent layer and extending the service life of the coating.

[0144] 4. The water-based epoxy backwater-side odor-free waterproof coating of the present invention specifically introduces silane coupling agents and toughening agents into the coating formulation to enhance the interfacial fusion between the coating and the substrate, and significantly improves the adhesion strength in dry, wet, immersion, and heat treatment states.

[0145] 5. The coating prepared by this invention has excellent hardness, lower VOC content, better drying speed and composite coating film performance, and excellent overall performance, making it suitable for different application areas such as home decoration, industry, and roofing.

[0146] In summary, the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any changes, modifications, and evolutions made by those skilled in the art without departing from the scope of the present invention based on the disclosed technical content shall be considered equivalent embodiments of the present invention. Furthermore, any changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present invention shall still fall within the protection scope of the present invention.

[0147] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0148] Experimental methods not specified in this invention are generally performed under conventional conditions or as recommended by the manufacturer.

[0149] Unless otherwise stated, the various optimized technical solutions in this invention can be combined with each other.

[0150] Unless otherwise stated, percentages and parts are weight percentages and weight parts.

[0151] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as are familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be used in the methods of this invention.

Claims

1. A water-based epoxy back-side odor-free waterproof coating, characterized in that: It includes component A and component B, with a weight ratio of 1 to 5:

1. Component A comprises the following raw materials in weight percentages: The composition includes 20-50% water-based epoxy curing agent, 0.5-2% dispersant, 0.1-2% defoamer, 0.1-2% thickener, 10-20% abrasion-resistant powder, 10-40% pigment and filler mixture, 10-40% water, 0.01-2% anti-settling agent, 0.01-2% wetting and leveling agent, 0.01-2% scratch-resistant agent, and 0.01-2% bactericide. All components are prepared in 100% proportions. The water-based epoxy curing agent is a modified amine curing agent, comprising: Epoxy resin E51, polyethylene glycol diglycidyl ether, aliphatic polyamine, reactive emulsifier, end-capping agent and propylene glycol methyl ether; The weight ratio of epoxy resin E51: polyethylene glycol diglycidyl ether: aliphatic polyamine is 1-3:2-4:10-15. The amount of the reactive emulsifier used is 0.5-2% of the weight of the aliphatic polyamine; The amount of the capping agent used is 1-10% of the weight of the aliphatic polyamine; The amount of propylene glycol methyl ether used is 5-12% of the weight of epoxy resin E51; The reactive emulsifiers include: sodium acrylamide isopropyl sulfonate and fatty alcohol polyoxyethylene ether; The weight ratio of sodium acrylamide isopropyl sulfonate to fatty alcohol polyoxyethylene ether is 1-5:1-10. The capping agents include: o-toluene glycidyl ether and C12-14 alkyl glycidyl ether; The weight ratio of o-toluene glycidyl ether to C12-14 alkyl glycidyl ether is 1-5:1-10; The aliphatic polyamine is one or a combination of several of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, and diethylaminopropylamine; The wear-resistant powder is a combination of basalt flakes and glass powder in a weight ratio of 1:

2. The pigment and filler mixture comprises: titanium dioxide, quartz powder, dispersant and silane coupling agent, wherein the weight ratio of titanium dioxide:quartz powder:dispersant:silane coupling agent is 1~2:1~2:0.5:0.1~0.5; The titanium dioxide mentioned is titanium dioxide with aluminum oxide or chromium oxide coated on the surface, wherein the weight percentage content of titanium dioxide is 94-95.5%, the oil absorption is 17-20g / 100g, and the whiteness is ≥93%; The quartz powder mentioned is quartz powder with a SiO2 content of ≥99%; The pigment and filler mixture is first mixed and pre-prepared into a pigment and filler polymer slurry before use; Component B comprises the following raw materials in weight percentages: The composition consists of 20-90% aqueous epoxy emulsion, 1-10% silane coupling agent, and 1-20% toughening agent, with all components prepared to be 100%.

2. The water-based epoxy backwater-side odor-free waterproof coating according to claim 1, characterized in that: The preparation of the pigment and filler polymer slurry includes the following steps: Titanium dioxide, quartz powder, dispersant and silane coupling agent were loaded into a closed ball mill reactor and ball-milled for 16 hours to prepare a white sludge-like pigment and filler polymer slurry with a particle size of 40-80 nm.

3. The water-based epoxy backwater-side odor-free waterproof coating according to claim 1, characterized in that: The glass powder is one or a combination of several of the following: spherical powders made of silicon oxide, aluminum oxide, iron oxide, and sodium oxide.

4. The water-based epoxy backwater-side odor-free waterproof coating according to claim 1, characterized in that: The water-based epoxy curing agent comprises the following preparation steps: S1. Polyethylene glycol diglycidyl ether, epoxy resin E51 and propylene glycol methyl ether are put into a three-necked flask; the oil bath is heated to 80°C and the pressure inside the flask is maintained at 0.1 kPa. After vacuuming for 0.5 to 3 hours, the mixture is cooled to room temperature to obtain the treated oligomer. S2. Take an aliphatic polyamine, stir and heat it to 40-70°C under nitrogen protection, and start adding the oligomer pretreated in step S1 at this temperature. The addition should be completed within 2 hours. After the addition is completed, keep the reaction at the temperature for a certain period of time. After the reaction is completed, distill under reduced pressure until all the solvent is evaporated to obtain the modified chain extension product. S3. After testing the amine value of the modified chain extension reaction product obtained in step S2 and finding no significant decrease, stop the reaction. Continue to add the reactive emulsifier and end-capping agent dropwise at 80°C, controlling the addition to be completed within 2 hours. Finally, slowly add an appropriate amount of deionized water, stir for 1 hour, adjust the solid content to 55-60%, and after the reaction is completed, distill under reduced pressure, cool, and filter to obtain the water-based epoxy curing agent.

5. The water-based epoxy backwater-side odor-free waterproof coating according to claim 1, characterized in that: It includes one or more of the following features: The dispersant is one or a combination of several of the following: BYK-181, BYK-190, DIS-188A, and SN-5027; The defoamer is one or a combination of several of the following: BYK-019, BYK-1711, TEGO-901W, FoamStar ST2410AG, and BYK-024; The thickener is organically modified lithium montmorillonite clay with a particle size of 80% ≤ 125 μm and a white powder appearance; The anti-settling agent is a modified polyurea solution; The wetting and leveling agent is one or a combination of several of the following: BYK-346, BYK-333, TEGO-4100, TEGOWET-270, and EFKA-3772; The anti-scratch additive is one or a combination of several of the following: DC51, wax emulsion, and wax powder; The bactericide mentioned is one or a combination of several of LPC5, LXE, BIOX520W, and BIOXABZ; The aqueous epoxy emulsion is one or a combination of several of Dow AEH-20, Dow DER WB3002, and Handai HDE8370-WB; The silane coupling agent is one or a combination of several silane coupling agents containing epoxy groups or diamino groups; The toughening agent is one or a combination of several of the following: dipropylene glycol butyl ether, diisononyl cyclohexane 1,2-dicarboxylate, and benzyl alcohol.

6. A method for preparing the water-based epoxy backwater-side odor-free waterproof coating according to claim 1, characterized in that: It includes the following preparation steps: S1. Preparation of Component A: Add the water-based epoxy curing agent to the deionized water under stirring according to the proportion, then add the thickener, dispersant, defoamer, anti-scratch agent, bactericide, and wetting and leveling agent. After dispersing evenly, add the wear-resistant powder and pigment and filler mixture, grind to a suitable fineness, add the remaining deionized water, stir evenly, add the anti-settling agent to adjust the appropriate viscosity, and obtain Component A; S2. Preparation of Component B: The aqueous epoxy emulsion, toughening agent, and silane coupling agent are stirred evenly according to the proportion to obtain Component B; S3. Add component B to component A, stir and mix in proportion, and react to obtain the water-based epoxy backwater-side odor-free waterproof coating.

7. A method for applying the water-based epoxy back-side odor-free waterproof coating as described in claim 1, characterized in that: Apply the water-based epoxy backwater-side odor-free waterproof coating directly to the surface of uncured plastic concrete by roller / spray / brush. After it dries naturally for one week, proceed with routine subsequent treatments.

8. A coating, characterized in that: It is a coating obtained by applying the water-based epoxy backwater-side deodorizing and waterproof coating of claim 1 onto a substrate.

9. An article, characterized in that: It includes a substrate and the coating obtained by coating the substrate as described in claim 8.

10. The application of the water-based epoxy backwater-resistant, odor-neutralizing waterproof coating according to claim 1, characterized in that: It includes the following steps: A. Substrate preparation: Level, dry, and clean the substrate to be constructed; B. Applying putty: Add quartz powder to the water-based epoxy backwater-side odor-free waterproof coating and apply several coats to the base surface. After curing, a putty layer is formed. C. Apply sealing primer: Apply the water-based epoxy backwater-side odor-free waterproof coating as a sealing and alkali-resistant primer to the surface of the putty layer, and form a primer layer after curing; D. Application coating: Apply the water-based epoxy backwater-side odorless waterproof coating evenly over the primer layer.

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