Two-component waterborne epoxy thermal-insulation sealing coating and preparation method thereof

Abstract

The invention discloses a two-component water-based epoxy thermal-insulation sealing coating and a preparation method thereof, the two-component water-based epoxy thermal-insulation sealing coating comprises a component A and a component B in a mass ratio of 1: 1, and the component A and the component B comprise the following raw materials in percentage by weight: the component A: 20-50% of water-based epoxy resin emulsion; 2-20% of micron-sized hollow glass beads; 1 to 10% of nano-scale aerogel powder; 1.5%-30% of perlite; 1.5%-30% of sepiolite; and the balance of water. A proper amount of dispersant; the component B comprises 20-80% of a waterborne epoxy amine curing agent; and 20-80% of water. The two-component water-based epoxy heat-preservation sealing coating has a compact cross-linked network, has good adhesive force and permeability on the surface of concrete, has the effects of sealing, preventing moisture and preventing steel bars on the surface layer of the concrete from rusting, has good adhesive property on a heat-preservation material, and is also suitable for being used as an adhesive material of an environment-friendly water-based heat-preservation coating. The cured thermal insulation coating not only has better thermal insulation performance, but also has higher hardness and strength, and has better capability of preventing moisture and condensation from permeating.

Description

Technical Field

[0001] This application relates to the technical field of coating compositions, and particularly to a two-component waterborne epoxy heat-insulating and sealing coating and a preparation method thereof. Background Art

[0002] For heat preservation and energy conservation, a heat-insulating and energy-saving coating containing fibrous heat-insulating materials is usually coated on the back of the concrete roof slab on the first basement floor of high-rise buildings in the north, that is, the back of the concrete floor slab on the first floor. However, due to its loose structure, it does not have the functions of moisture-proof and humidity-proof. In the underground parking lot, due to poor ventilation and high humidity for a long time, condensation is likely to occur when the temperature suddenly rises and will be adsorbed by the insulation layer, resulting in the surface steel bars of the concrete floor slab, beams and columns being prone to rust, posing a great hidden danger to the structural safety of the building. Therefore, it is necessary to develop a waterborne heat-insulating and sealing coating that not only has a good heat-insulating effect but also has the ability to prevent moisture and seal the concrete surface and prevent the surface steel bars of the concrete from rusting. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a heat-insulating and sealing coating for sealing, moisture-proofing and anti-corrosion of the surface concrete of a building, and the technical solutions adopted include:

[0004] The heat-insulating and sealing coating includes component A and component B with a mass ratio of 1:1. The raw materials of component A and component B include, by weight percentage

[0005] Component A:

[0006]

[0007]

[0008] Component B

[0009] Waterborne epoxy amine curing agent 20 - 80%

[0010] Water 20 - 80%.

[0011] One embodiment of the present invention solves the technical problems by adopting the following technical solutions:

[0012] Preparation method of the two-component waterborne epoxy heat-insulating coating:

[0013] Step 1. Prepare component A

[0014] Step 1.1. Weigh the raw materials according to the formula;

[0015] Step 1.2. Add the waterborne epoxy resin emulsion to the dispersant and disperse evenly under strong stirring; Step 1.3. Add the nano-aerogel powder and disperse evenly under strong stirring;

[0016] Step 1.4: Add micron-sized hollow glass microspheres and stir vigorously until evenly dispersed.

[0017] Step 1.5: Add perlite and sepiolite in sequence and stir vigorously until evenly dispersed.

[0018] Step 1.6: Add the remaining water, stir evenly, and then discharge for packaging.

[0019] Step 2: Prepare Component B

[0020] Step 2.1: Weigh the raw materials according to the formula.

[0021] Step 2.2: Stir the waterborne epoxy amine curing agent and water evenly, and then discharge for packaging.

[0022] Advantages of the present invention: As an environmentally friendly two-component adhesive, the waterborne epoxy resin not only has a dense cross-linked network but also has good adhesion and permeability to the concrete surface, thus achieving a good effect of sealing moisture and preventing the steel bars on the concrete surface from rusting. At the same time, it has good adhesion to thermal insulation materials such as aerogel powder, glass microspheres, perlite, and sepiolite. Therefore, it is also suitable as an adhesive for environmentally friendly waterborne thermal insulation coatings. The cured thermal insulation coating not only has good thermal insulation performance but also has high hardness and strength, and has good ability to prevent moisture and condensation from penetrating. Specific Embodiments

[0023] The terms used in the present invention generally have the meanings commonly understood by those of ordinary skill in the art unless otherwise specified.

[0024] The present invention will be further described in detail below with reference to specific examples and data. It should be understood that this example is only for illustrating the present invention and does not limit the scope of the present invention in any way.

[0025] In the following examples, various processes and methods not described in detail are conventional methods well known in the art. The materials, reagents, devices, instruments, equipment, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

[0026] The thermal insulation and sealing coating comprises Component A and Component B with a mass ratio of 1:1. The raw materials of Component A and Component B include, by weight percentage

[0027] Component A:

[0028]

[0029]

[0030] Component B

[0031] Water-based epoxy amine curing agent: 20 - 80%

[0032] Water: 20 - 80%.

[0033] The water-based epoxy resin emulsion mentioned above is an emulsion obtained by emulsifying epoxy resins such as E51 and E41, and its solid content is between 40% and 60%. In this embodiment, the water-based epoxy resin emulsion is sourced from....;

[0034] The water-based epoxy amine curing agent is an aqueous solution of aliphatic modified amine curing agent, and its solid content is between 30% and 60%. In this embodiment, the aliphatic modified amine curing agent is sourced from....

[0035] According to the above content, Examples 1 - 6 of this application are proposed. The content of each component in Component A of Examples 1 - 6 is shown in Table 1, and the content of each component in Component B is shown in Table 2.

[0036] Table 1

[0037]

[0038]

[0039] Table 2

[0040]

[0041] It can be known from the content recorded in Table 1 and Table 2 that the preparation method of the heat-insulating and sealing coating in Examples 1 - 6 includes:

[0042] Step 1: Prepare Component A

[0043] Step 1.1: Weigh the raw materials according to the formula;

[0044] Step 1.2: Add a dispersant to the water-based epoxy resin emulsion and disperse it evenly under strong stirring;

[0045] Step 1.3: Add nano-aerogel powder and disperse it evenly under strong stirring;

[0046] Step 1.4: Add micron-sized hollow glass microspheres and disperse it evenly under strong stirring;

[0047] Step 1.5: Add perlite and sepiolite in sequence and disperse it evenly under strong stirring;

[0048] Step 1.6: Add the remaining water, stir evenly, and then discharge and package;

[0049] Step 2: Prepare Component B

[0050] Step 2.1: Weigh the raw materials according to the formula.

[0051] Step 2.2: After uniformly stirring the waterborne epoxy amine curing agent and water, discharge and package.

[0052] The two-component environmentally friendly waterborne epoxy thermal insulation and sealing coating prepared in Examples 1-6 should be stored in a cool and ventilated place. When in use, stir and mix evenly in the ratio of Component A: Component B = 1:1, and then apply by brushing, rolling or spraying. The surface drying time is about 3-4 hours, the actual drying time is about 24 hours, the single coating thickness is about 1 mm, and the total coating thickness is about 2-3 mm. Detect the thermal conductivity of the dried epoxy thermal insulation and sealing coating, and the detection results are shown in Table 3.

[0053] Table 3

[0054] Thermal Conductivity (W / M.K) Example 1 0.08 Example 2 0.06 Example 3 0.041 Example 4 0.038 Example 5 0.045 Example 6 0.052

[0055] According to the detection results in Table 3, the thermal conductivity of the thermal insulation and sealing coatings prepared in Examples 1-6 is low, and coating on the inner and outer surfaces of concrete slabs, beams and columns can play the role of thermal insulation and energy saving; in addition, as an environmentally friendly two-component adhesive, waterborne epoxy resin not only has a dense cross-linked network but also has good adhesion and permeability to the concrete surface, thus achieving a good effect of sealing and moisture-proofing and preventing the surface steel bars of concrete from rusting. Moreover, waterborne epoxy resin has good adhesion to thermal insulation materials such as aerogel powder, glass microspheres, perlite, and sepiolite. Therefore, it is also suitable as an adhesive for environmentally friendly waterborne thermal insulation coatings. The cured coating not only has good thermal insulation performance, but also has high hardness and strength, and has good ability to prevent the penetration of moisture and condensation.

[0056] Certainly, the present invention is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A two-component water-based epoxy thermal insulation sealing coating, characterized in that: It includes component A and component B in a mass ratio of 1:1, and the raw materials of component A and component B include, by weight percentage Component A: Component B Water-based epoxy amine curing agent 20-80% Water 20-80%.

2. The two-component waterborne epoxy thermal insulation sealing coating according to claim 1, characterized in that: The water-based epoxy resin emulsion is a water-based emulsion obtained by emulsifying E51 or E41 epoxy resin, and the solid content of the water-based epoxy resin emulsion is 40-60%.

3. The two-component waterborne epoxy thermal insulation sealing coating according to claim 1, characterized in that: The water-based epoxy amine curing agent is an aqueous solution of aliphatic modified amine curing agent, and its solid content is between 30% and 60%.

4. A method for preparing a two-component waterborne epoxy thermal insulation sealing coating as claimed in any one of claims 1 to 3, characterized in that: Step 1: Prepare component A Step 1.1, weigh the raw materials according to the formula; Step 1.2, add the waterborne epoxy resin emulsion to the dispersant and disperse it evenly under strong stirring; Step 1.3, add nano aerogel powder, stir vigorously and disperse evenly; Step 1.4, add micron-sized hollow glass beads and vigorously stir to disperse evenly; Step 1.5, add perlite and sepiolite in turn, stir vigorously and disperse evenly; Step 1.6, add the remaining water, stir evenly, and then pack the material; Step 2: Preparation of component B Step 2.1, weigh the raw materials according to the recipe. Step 2.2: Mix the water-based epoxy amine curing agent and water evenly, then pack the material.

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