Two-component epoxy topcoat and method of use and application thereof

Abstract

The application provides a two-component epoxy finish, a use method and application thereof, and belongs to the technical field of paints. The two-component epoxy finish comprises component A and component B. The component A comprises an epoxy resin, a compounded dispersant and a compounded filler. The component B comprises an amine curing agent. The compounded dispersant in the component A comprises a polyurethane dispersant and an organic silicon wetting dispersant. The compounded filler comprises a small-particle-size main filler and a large-particle-size auxiliary filler. The component B is matched with a polyether amine curing agent. The obtained two-component epoxy finish has good fluidity, and can be constructed by using a rolling method. The plate surface after construction can achieve a mirror surface effect.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a two-component epoxy topcoat and its application method and application. Background Technology

[0002] Flooring is a general term for various types of ground surfaces, referring to surfaces that achieve certain decorative effects and special functions through specific tools, materials, and construction techniques. Examples include epoxy flooring, emery abrasion-resistant flooring, ultra-flat flooring, and epoxy terrazzo flooring. Epoxy resin topcoat flooring, also known as epoxy flooring, is a type of flooring made by mixing epoxy resin as the main material with curing agents, diluents, solvents, dispersants, defoamers, and certain fillers. It is then applied on-site using specific flooring construction techniques.

[0003] Currently, conventional epoxy floor coatings are generally divided into roller-applied and self-leveling types. The roller application rate for roller-applied epoxy topcoats is 0.18–0.25 kg / m². 2 It has the advantage of small dosage. CN103771760A discloses a construction method for epoxy floor paint. The first step is to mix the epoxy floor paint components A and B in a volume ratio of 1:2 and roll them evenly as a base coat to seal the capillaries on the substrate surface and enhance the adhesion between the substrate and the paint layer. The second step is to mix the epoxy floor paint components A and B in a volume ratio of 1:2 and stir them evenly, then add 40-80 mesh quartz sand to make an epoxy quartz mortar, and apply the epoxy mortar intermediate layer. The third step is to apply the epoxy floor paint... Components A and B of the paint are mixed in a 1:2 volume ratio and stirred thoroughly. 300-mesh quartz powder is added to create an epoxy resin putty, which is then applied 1-2 times to fill sand holes and prepare for the topcoat application. The fourth step involves mixing components A and B of the epoxy floor paint in a 1:2 volume ratio and applying a self-leveling topcoat using a trowel. This invention uses a water-based epoxy primer to reinforce the base, stabilize residual dust particles on the substrate, increase adhesion between the substrate and the coating, and seal any residual alkali on the substrate. However, roller-applied epoxy topcoats often result in ripples on the surface after application, leading to poor aesthetics.

[0004] The dosage of self-leveling epoxy topcoat is 0.8–1.2 kg / m². 2After construction, the surface of the board exhibits a mirror-like effect. CN102876186A discloses a self-leveling anti-static epoxy topcoat for flooring, comprising low-molecular-weight resin, fatty glycidyl ether, filler, color paste, defoamer and other additives, conductive powder and curing agent. The mass ratio of the low-molecular-weight resin, fatty glycidyl ether, filler, color paste, defoamer and other additives, conductive powder and curing agent is 40-50, 2-10, 10-20, 5-15, 1-6, 15-25 and 20-30. Through the above method, this invention can make the ground uniform in color, full, beautiful, wear-resistant, and prevent static electricity buildup from causing safety accidents, making it suitable for the semiconductor industry and precision industries. However, the cost of self-leveling epoxy topcoat is much higher than that of roller-applied epoxy topcoat, which is not conducive to large-scale industrial use.

[0005] Therefore, in order to solve the above technical problems, it is urgent to develop a two-component epoxy topcoat that can be applied by roller coating and has a mirror-like effect on the board surface after application. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a two-component epoxy topcoat, its application method, and its application. The two-component epoxy topcoat includes component A and component B. By selecting specific combinations of components A and B, it achieves high flowability, allowing for roller application. Furthermore, the applied surface exhibits a mirror-like effect, specifically at 0.18–0.2 kg / m². 2 With a small amount of roller coating, a mirror-like finish can be achieved with self-leveling surface paint, thus greatly reducing costs.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a two-component epoxy topcoat, the two-component epoxy topcoat comprising component A and component B;

[0009] Component A includes epoxy resin, compound dispersant and compound filler;

[0010] Component B includes a polyetheramine curing agent;

[0011] The compound dispersant includes polyurethane dispersants and organosilicon wetting and dispersing agents;

[0012] The compound packing includes small-diameter main packing and large-diameter auxiliary packing.

[0013] The two-component epoxy topcoat provided by this invention includes component A and component B; wherein, component A includes epoxy resin, a compound dispersant, and a compound filler, and component B includes a polyetheramine curing agent; by selecting a polyurethane dispersant and an organosilicon wetting and dispersing agent in combination as a compound dispersant in component A, the viscosity of component A is greatly reduced; furthermore, by using two different particle sizes of fillers, small-particle-size main filler and large-particle-size auxiliary filler, component A also has excellent leveling effect; finally, by combining component B, which contains a polyetheramine curing agent with low viscosity, the two-component epoxy topcoat after mixing components A and B has high fluidity, and can be applied by roller coating, and the surface of the applied board can achieve a mirror effect, combining the advantages of self-leveling epoxy topcoat and roller-applied epoxy topcoat.

[0014] Preferably, component A comprises the following components in parts by weight:

[0015] 30-40 parts by weight of epoxy resin;

[0016] 0.5–1.5 parts by weight of compound dispersant;

[0017] The compound filler is 45-70 parts by weight.

[0018] The epoxy resin may be 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, or 39 parts by weight, etc.

[0019] The compound dispersant can be 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, 1 part by weight, 1.1 parts by weight, 1.2 parts by weight, 1.3 parts by weight, or 1.4 parts by weight, etc.

[0020] The compound filler can be 47 parts by weight, 49 parts by weight, 51 parts by weight, 53 parts by weight, 55 parts by weight, 57 parts by weight, 59 parts by weight, 61 parts by weight, 63 parts by weight, 65 parts by weight, 67 parts by weight, or 69 parts by weight, etc.

[0021] Preferably, the polyurethane dispersant is further preferably UNIQ560S, a polyurethane modified dispersant from Yuka Chemicals.

[0022] Preferably, the organosilicon wetting and dispersing agent is further preferably UNIQ765S organosilicon wetting and dispersing agent from Yuka Chemicals.

[0023] Preferably, the mass ratio of the polyurethane dispersant to the silicone wetting and dispersing agent is (1.2-1.5):1, for example, 1.22:1, 1.24:1, 1.26:1, 1.28:1, 1.3:1, 1.32:1, 1.34:1, 1.36:1, 1.38:1, 1.4:1, 1.42:1, 1.44:1, 1.46:1, or 1.48:1, etc.

[0024] As a preferred technical solution of the present invention, the mass ratio of polyurethane dispersant to organosilicon wetting and dispersing agent is limited to (1.2 to 1.5):1, which can minimize the viscosity of A and thus enable the final two-component epoxy topcoat to have higher fluidity.

[0025] Preferably, the small-particle-size main filler comprises 1250-mesh ultrafine barium sulfate.

[0026] Preferably, the oil absorption capacity of the small-particle-size main packing is not higher than 10, for example, 9, 8, 7, 6, 5, 4, 3, 2 or 1.

[0027] Preferably, the particle size of the large-particle-size auxiliary filler is 600-800 mesh, such as 620 mesh, 640 mesh, 660 mesh, 680 mesh, 700 mesh, 720 mesh, 740 mesh, 760 mesh or 780 mesh, etc.

[0028] Preferably, the large-particle-size auxiliary filler includes heavy calcium carbonate.

[0029] Preferably, the mass ratio of the small-diameter main packing to the large-diameter auxiliary packing is (2-3):1, for example, 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1 or 2.9:1, etc.

[0030] As a preferred technical solution of the present invention, limiting the mass ratio of the small-particle-size main filler and the large-particle-size auxiliary filler to (2-3):1 can make component A have a better leveling effect, thereby making the final two-component epoxy topcoat more fluid and the final board surface more mirror-like.

[0031] Preferably, component A further includes other additives.

[0032] Preferably, the viscosity of component A is 100-130 Ku, for example, 100 Ku, 110 Ku, 120 Ku, or 130 Ku.

[0033] Preferably, the content of polyetheramine curing agent in component B is 50 to 80 parts by weight, such as 55 parts by weight, 60 parts by weight, 65 parts by weight, 70 parts by weight, or 75 parts by weight.

[0034] Preferably, component B further includes a solvent.

[0035] Preferably, the solvent comprises S100 solvent oil and / or dimethyl carbonate.

[0036] Preferably, the solvent content in component B is 10 to 40 parts by weight, such as 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, or 35 parts by weight.

[0037] Preferably, component B further includes a catalyst.

[0038] Preferably, the catalyst comprises 2,4,6-tris(dimethylaminomethyl)phenol.

[0039] Preferably, the catalyst content in component B is 1 to 10 parts by weight, such as 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, or 9 parts by weight.

[0040] Preferably, the viscosity of component B is 200-400 cps, such as 220 cps, 240 cps, 260 cps, 280 cps, 300 cps, 320 cps, 340 cps, 360 cps or 380 cps.

[0041] Secondly, the present invention provides a method of using a two-component epoxy topcoat as described in the first aspect, the method comprising the following steps:

[0042] (1) Epoxy resin, compound dispersant, compound filler and optional other additives are mixed to obtain component A; polyetheramine curing agent, optional solvent and optional catalyst are mixed to obtain component B;

[0043] (2) Mix the components A and B obtained in step (1) and roll them onto the substrate to complete the use of the two-component epoxy topcoat.

[0044] Preferably, the amount of roller coating used in step (2) is 0.18–0.25 kg / m³. 2 For example, 0.18 kg / m 2 0.2kg / m 2 0.205kg / m 2 0.21kg / m 2 0.22kg / m 2 0.23kg / m 2 Or 0.24kg / m 2 wait.

[0045] Thirdly, the present invention provides an application of a two-component epoxy topcoat as described in the first aspect in flooring.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The two-component epoxy topcoat provided by this invention includes component A and component B. Component A includes epoxy resin, a compound dispersant, and a compound filler, while component B includes an amine curing agent. By limiting the compound dispersant in component A to include polyurethane dispersants and silicone wetting and dispersing agents, and the compound filler to include small-particle-size main fillers and large-particle-size auxiliary fillers, and combining it with component B containing a polyether amine curing agent, the resulting two-component epoxy topcoat has good flowability, allowing it to be applied by roller coating, and the finished surface can achieve a mirror effect. Detailed Implementation

[0048] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0049] The following is some information about the raw materials involved in the specific embodiments of the present invention:

[0050] (1) Component A:

[0051] Epoxy resin: sourced from Shanghai Yuanbang Chemical Manufacturing Co., Ltd., brand name YPE-128;

[0052] Polyurethane dispersant: sourced from Yuka Chemicals, brand name UNIQ560S;

[0053] Organosilicon wetting and dispersing agent: derived from Yuka Chemicals, UNIQ765S;

[0054] Wetting and leveling agent: sourced from Guangzhou Lenz Trading Co., Ltd., brand name LC-178;

[0055] Defoamer: sourced from Guangzhou Shizhan Coatings Co., Ltd., brand name 6810;

[0056] Anti-settling agent: sourced from Kunshan Daiquan Fine Chemical Technology Co., Ltd., brand name BYK410.

[0057] (2) Component B:

[0058] Polyetheramine curing agent: specifically, a polyetheramine modified curing agent, sourced from Henster Industrial (Xiangyang) Co., Ltd., brand name C-16;

[0059] Alicyclic amine curing agent: specifically a modified cycloalicyclic amine curing agent, sourced from Henster Industrial (Xiangyang) Co., Ltd., brand name 9027;

[0060] Solvents: specifically dimethyl carbonate and S100;

[0061] Catalyst: Specifically, 2,4,6-tris(dimethylaminomethyl)phenol.

[0062] Examples 1-8

[0063] A two-component epoxy topcoat, comprising component A and component B in a mass ratio of 4:1;

[0064] The specific composition of components A and B is shown in Table 1. The amount of each component in Table 1 is in "parts by weight".

[0065] Table 1

[0066]

[0067] The application method of the two-component epoxy topcoat provided in Examples 1-8 includes the following steps:

[0068] (1) Mix epoxy resin, compound dispersant, compound filler and other additives evenly to obtain component A;

[0069] The polyetheramine curing agent, solvent, and catalyst are mixed evenly to obtain component B;

[0070] (2) After thoroughly mixing component A and component B obtained in step (1), mix them at a rate of 0.2 kg / m³. 2 The coating amount is applied by roller to the surface of the cement board that has been coated with epoxy intermediate coating, and dried to complete the application of the two-component epoxy topcoat.

[0071] Comparative Examples 1-6

[0072] A two-component epoxy topcoat, comprising component A and component B in a mass ratio of 4:1;

[0073] The specific composition of components A and B is shown in Table 2. The amount of each component in Table 2 is in "parts by weight".

[0074] Table 2

[0075]

[0076] The application methods for the two-component epoxy topcoats provided in Comparative Examples 1-6 include the following steps:

[0077] (1) Mix epoxy resin, compound dispersant, compound filler and other additives evenly to obtain component A;

[0078] The curing agent, solvent, and catalyst are mixed evenly to obtain component B.

[0079] (2) After thoroughly mixing component A and component B obtained in step (1), mix them at a rate of 0.2 kg / m³. 2The coating amount is applied by roller to the surface of the cement board that has been coated with epoxy intermediate coating, and dried to complete the application of the two-component epoxy topcoat.

[0080] Performance testing:

[0081] (1) Flowability: The test shall be conducted in accordance with the provisions of 7.3 in JC / T985-2017;

[0082] (2) Mirror effect: visual observation.

[0083] The two-component epoxy topcoats provided in Examples 1-8 and Comparative Examples 1-6 were tested according to the above test methods. The test results are shown in Table 3.

[0084] Table 3

[0085]

[0086] As can be seen from the data in Table 3, the two-component epoxy topcoat provided by this invention has high fluidity, and the surface of the board after application by roller coating can achieve the mirror effect that self-leveling topcoats can achieve; specifically:

[0087] (1) The two-component epoxy topcoat provided in Examples 1 to 3 and 8 has a flowability of up to 145 to 150 mm. After being applied by roller coating, the surface of the board is as smooth as a mirror without roller ripples, and it shows a mirror reflection when viewed through a window. However, it should be noted that the two-component epoxy topcoat provided in Example 8 has a longer drying time because no catalyst was added.

[0088] (2) Compared with Example 1, only a single type of dispersant was added to component A of the two-component epoxy topcoat provided in Comparative Examples 1 to 2, which resulted in a significant decrease in the fluidity of the two-component epoxy topcoat. Furthermore, after application by roller coating, the surface of the board had roller ripples, and the ripples were dense.

[0089] (3) Compared with Example 1, the A component of the two-component epoxy topcoat provided by Comparative Examples 3 to 4 uses only a single type of filler, which also leads to a decrease in the fluidity of the two-component epoxy topcoat. Furthermore, after applying the coating by roller, dense roller ripples also appear on the surface of the board.

[0090] (4) Compared with Example 1, no dispersant was added to component A of the two-component epoxy topcoat provided in Comparative Example 5. This not only resulted in a significant decrease in the flowability of the two-component epoxy topcoat, but also made the surface of the board very rough with dense roller ripples after the roller coating method was applied.

[0091] (5) Compared with Example 1, the B component of the two-component epoxy topcoat provided in Comparative Example 6 uses an alicyclic amine curing agent, which also leads to a decrease in the fluidity of the final two-component epoxy topcoat. At the same time, after applying it by roller coating, roller ripples appeared on the surface of the board.

[0092] (6) Compared with Example 1, the flowability of the two-component epoxy topcoat provided in Examples 4 to 7 has also decreased, indicating that for the two-component epoxy topcoat provided by the present invention, in order to obtain high flowability and excellent mirror effect, it is not only possible to use two dispersants and two fillers in combination, but also there are specific requirements for the ratio of the two dispersants and two fillers.

[0093] The applicant declares that this invention illustrates a two-component epoxy topcoat and its application method through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials of this invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A two-component epoxy topcoat, characterized in that, The two-component epoxy topcoat includes component A and component B; Component A includes epoxy resin, compound dispersant, compound filler and other additives; Component B includes a polyetheramine curing agent, a catalyst, and a solvent; The compound dispersant includes polyurethane dispersants and organosilicon wetting and dispersing agents; The mass ratio of the polyurethane dispersant to the organosilicon wetting and dispersing agent is (1.2~1.5):1; The compound packing includes small-diameter main packing and large-diameter auxiliary packing; The mass ratio of the small-diameter main packing to the large-diameter auxiliary packing is (2~3):1; The small-particle-size main packing includes 1250-mesh ultrafine barium sulfate; The particle size of the large-particle-size auxiliary filler is 600~800 mesh; The large-particle-size auxiliary filler includes heavy calcium carbonate; The application method of the two-component epoxy topcoat includes the following steps: (1) Mix epoxy resin, compound dispersant, compound filler and other additives to obtain component A; Component B is obtained by mixing polyetheramine curing agent, solvent and catalyst; (2) Mix the components A and B obtained in step (1) and roll them onto the substrate to complete the use of the two-component epoxy topcoat. The amount of roller coating used in step (2) is 0.18~0.25 kg / m. 2 .

2. The two-component epoxy topcoat according to claim 1, characterized in that, Component A comprises the following components in parts by weight: 30-40 parts by weight of epoxy resin 0.5~1.5 parts by weight of compound dispersant The compound filler consists of 45-70 parts by weight, along with other additives.

3. The two-component epoxy topcoat according to claim 1, characterized in that, The oil absorption capacity of the small-particle-size main packing is no higher than 10.

4. The two-component epoxy topcoat according to claim 1, characterized in that, The other additives include any one or a combination of at least two of wetting and leveling agents, defoamers, or antisettling agents.

5. The two-component epoxy topcoat according to claim 1, characterized in that, The viscosity of component A is 110~130 KU.

6. The two-component epoxy topcoat according to claim 1, characterized in that, The content of polyetheramine curing agent in component B is 50-80 parts by weight.

7. The two-component epoxy topcoat according to claim 1, characterized in that, The solvent content in component B is 10 to 40 parts by weight.

8. The two-component epoxy topcoat according to claim 1, characterized in that, The catalyst content in component B is 1 to 10 parts by weight.

9. The two-component epoxy topcoat according to claim 1, characterized in that, The viscosity of component B is 200~400 cps.

10. The two-component epoxy topcoat according to claim 1, characterized in that, The mass ratio of component A to component B is (4~5):

1.

11. A method of using a two-component epoxy topcoat as described in any one of claims 1 to 10, characterized in that, The method of use includes the following steps: (1) Mix epoxy resin, compound dispersant, compound filler and optional other additives to obtain component A; A polyetheramine curing agent, optionally a solvent, and optionally a catalyst are mixed to obtain component B; (2) Mix the components A and B obtained in step (1) and roll them onto the substrate to complete the use of the two-component epoxy topcoat. The amount of roller coating used in step (2) is 0.18~0.25 kg / m. 2 .

12. The application of a two-component epoxy topcoat as described in any one of claims 1 to 10 in flooring.

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