Construction method of radiation refrigeration film on outer layer of concrete enclosure structure

Abstract

The invention discloses a construction method of a radiation refrigeration film on an outer layer of a concrete retaining structure, which is characterized by comprising the following steps: S1, polishing and filling: polishing a tip bulge on the concrete retaining structure by using an angle grinder, and pouring and leveling by using a silicone adhesive; s2, surface hardening treatment: spraying or roll-coating a surface hardening agent; s3, cleaning: cleaning the surface of the concrete by using a high-pressure water gun after airing; s4, treating the surface by using an interface treating agent: roll-coating the interface treating agent; s5, film pasting is conducted, specifically, a radiation refrigeration film is laid, one side of the radiation refrigeration film is sequentially provided with a pasting adhesive layer and a release protection film from inside to outside, after the release protection film is stripped, the radiation refrigeration film is pasted to the concrete treated in the step S4 through the pasting adhesive layer, the radiation refrigeration film is more smoothly pasted and better bonded, and the radiation refrigeration film is more uniform in thickness and better in adhesion performance. And the coating is not easy to fall off during long-term use.

Description

Technical Field

[0001] This invention relates to the field of radiation cooling film application technology, specifically to a method for constructing a radiation cooling film on the outer layer of a concrete enclosure structure. Technical Background

[0002] Currently, building cooling relies on air conditioning, which is energy-intensive and environmentally unfriendly. To mitigate global warming, adopting zero-energy radiative cooling films for building cooling has become a necessary choice.

[0003] Currently, some buildings use cooling coatings, but these have poor cooling effects and short weather resistance, generally requiring repainting within 5 years. Radiant cooling films, on the other hand, offer superior cooling performance and can extend their lifespan to over 8 years.

[0004] Radiation-cooling thin films are a novel metamaterial product composed of polymers and inorganic functional materials, designed according to the principles of optics and heat transfer. They can be applied to the surfaces of building and equipment envelopes to reduce internal and surface temperatures, improving the comfort of the working environment within the envelope or extending the lifespan of equipment. This represents a novel, energy-efficient, emission-reducing, and cost-effective solution. It can be widely applied in various fields requiring cooling, energy conservation, improved comfort, and enhanced safety, such as green low-temperature grain storage, power communication and energy storage cabinets, large public buildings, petrochemical storage, and indoor and outdoor shading applications.

[0005] Building envelopes are generally classified into steel, concrete, wood, and stone structures, with the first two being the most common. For steel structure envelopes, patent CN110195494A discloses a method for constructing a radiative cooling film on a metal outer layer. The method involves first cleaning with a weak acid, drying, and then applying a coating. Afterward, a release liner for radiative cooling is applied to the coating using adhesive. This method is not suitable for concrete surfaces because steel surfaces are prone to corrosion and rust, requiring acid cleaning, while concrete surfaces do not have this problem. However, the surface is rough and uneven, making adhesion difficult. Summary of the Invention

[0006] The purpose of this invention is to provide a method for constructing a radiative cooling film on the outer layer of a concrete enclosure structure, which has the effects of smooth adhesion, good bonding, and resistance to detachment.

[0007] To achieve the above-mentioned technical objectives, this invention provides a method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure, comprising the following steps:

[0008] S1 Grinding and Filling: Grind down the sharp protrusions on the concrete enclosure structure with an angle grinder and fill them with silicone sealant to make them smooth; S2 Surface Hardening Treatment: Spray or roll on a surface hardener.

[0009] S3 Cleaning: After drying, use a high-pressure water gun to clean the concrete surface;

[0010] S4 interface treatment agent surface treatment: roller coating of interface treatment agent;

[0011] S5 Film Application: Obtain a radiation cooling film. One side of the radiation cooling film is provided with an adhesive layer and a release protective film from the inside out. After removing the release protective film, the radiation cooling film is adhered to the concrete treated in step S4 through the adhesive layer.

[0012] Preferably, step S2 specifically involves mixing a surface hardener with water and then spraying or rolling it onto the concrete treated in step S1, wherein the surface hardener includes silicates.

[0013] Preferably, the silicate is sodium silicate, potassium silicate, or lithium silicate.

[0014] Preferably, the ratio of sodium silicate to water is 1:0.5 to 1, and the ratio of potassium silicate to water is 1:0.3 to 0.5.

[0015] Preferably, the surface hardener is a mixture of sodium silicate and cement, wherein the mass ratio of sodium silicate to cement is 1:1.

[0016] Preferably, the interface treatment agent in step S4 is an epoxy resin emulsion, which is one or more combinations of solvent-based epoxy resin emulsion, waterborne epoxy resin emulsion, high-solids epoxy resin emulsion, and modified epoxy resin emulsion. The waterborne epoxy resin emulsion includes waterborne epoxy resin and a curing agent, and the ratio of waterborne epoxy resin to curing agent is 4:1.

[0017] Preferably, after the waterborne epoxy resin interface treatment agent and the waterborne epoxy curing agent are mixed in a certain proportion, water with a mass percentage of 5-15% is added.

[0018] Preferably, the coating thickness of the interface treatment agent is 1.5-3 mm.

[0019] Preferably, the adhesive backing of the radiation cooling film is butyl waterproof adhesive, and the thickness of the adhesive backing is 700-900 μm.

[0020] Preferably, the radiation cooling film is laid horizontally, with the boundary of the upper film overlapping the boundary of the lower film at the junction of two rolls of film by 8-10 cm.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] Grinding and filling make the concrete surface smoother, effectively reducing the formation of bubbles or voids during the application of the radiative cooling film. Spraying or rolling a surface hardener increases the hardness, abrasion resistance, and mechanical strength of the concrete surface. Rolling an interface treatment agent further improves the structural strength of the concrete surface while increasing surface roughness to enhance adhesion to the radiative cooling film adhesive layer.

[0023] The surface hardener uses silicate. A large number of Si-OH bonds in silicate penetrate into the concrete. Under the action of a catalyst, they react with active metal ions such as calcium ions in the concrete to generate cross-linked calcium silicate gel, which makes the concrete denser, increases its hardness, improves its wear resistance, enhances its mechanical strength, slows down or prevents concrete surface corrosion, and extends the service life of the concrete. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention are described in detail below. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; however, the present invention may also be implemented in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0026] The structure of a radiation cooling film mainly includes a weather-resistant layer, a composite adhesive layer, a reflective functional layer, a backing adhesive layer, and a release film.

[0027] A method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure includes the following steps:

[0028] 1) Grinding and filling:

[0029] Sharp protrusions on the concrete enclosure structure are ground down with an angle grinder to prevent the film from being penetrated during the application of the radiative cooling film. For pits that are visible to the naked eye, silicone sealant is used to fill them and smooth them out to prevent the radiative cooling film backing from not adhering properly and causing local voids.

[0030] 2) Surface hardening treatment: Sandblasting or rolling two coats of surface hardener can penetrate into the concrete, seal the concrete capillaries, increase the surface density of the concrete, and enhance the concrete's impermeability, strength, and wear resistance.

[0031] 3) Cleaning: Use a high-pressure water gun to clean the concrete surface to ensure that there is no sand or gravel. For roofs with stains or oil that have been there for a long time, use an alkaline cleaner to clean and remove them first. For scale, rust and deposits on the surface, use an acidic cleaner to clean them.

[0032] 4) Surface treatment with interface treatment agent: A layer of interface treatment agent is applied by roller, which has good adhesion to concrete and is water-resistant, moisture-heat resistant, and freeze-thaw resistant. It can effectively prevent surface hollowing and peeling, and enhance the adhesion between the adhesive layer and the concrete. The interface treatment agent is mainly an epoxy resin emulsion with a thickness of about 1.5-3mm. It mainly improves the adhesion performance of the substrate by sealing the surface or increasing the surface roughness. Epoxy resin solutions are mainly classified into four types: solvent-based, water-based, high-solids content, and modified epoxy. Solvent-based epoxy has strong penetration and fast drying, and is suitable for high-density concrete; water-based epoxy is environmentally friendly, but dries slowly; high-solids content forms a thick film, which can fill cracks and is suitable for repairing cracks on concrete surfaces; modified epoxy has good flexibility and is suitable for areas with large temperature differences.

[0033] 5) Applying film: Peel off the release film from the adhesive side of the radiation cooling film and apply it to the concrete surface after the above steps.

[0034] In areas with high rainfall, waterproof membrane can be first applied to a concrete surface treated with an interface agent, and then a radiative cooling film can be applied on top of it. This can achieve both waterproofing and cooling effects, and also has better peel strength.

[0035] In some embodiments, the enclosure structure has specially designed pointed protrusions. For example, the roof of the grain warehouse at the Sanhe Warehouse in Hebei Province, China Grain Reserves Corporation, has fixed lightning rods. During the construction of this area, the four sides need to be ground smooth and sealed with silicone sealant, with a thickness 2 to 3 times greater than that of the radiation cooling film, to ensure a tight seal.

[0036] Example 1

[0037] A method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure includes the following steps:

[0038] 1) Use an angle grinder to remove protrusions from the concrete surface and fill large pitted areas with silicone sealant.

[0039] 2) Mix sodium silicate surface hardener (water glass, modulus 2.6-2.9, Jiangsu Jiubang New Materials) with cement and water in a ratio of 1:1:0.5. Spray the first coat until the surface is saturated. The second coat is mainly to fill in the unabsorbed areas and make the entire surface saturated and moist.

[0040] 3) After drying, rinse the concrete surface with a high-pressure water gun to ensure that there is no sand or dust on the surface. If there is dirt, you can use a brush or other acidic or alkaline cleaner to wipe it off.

[0041] 4) Mix the water-based epoxy resin interface treatment agent (EPIKOTETM 6520-WH-53, HEXION) and the curing agent (Anquamine721, HEXION) in a 4:1 ratio, then add 5-15% water to extend the working time, and apply evenly to the cleaned concrete surface.

[0042] 5) Remove the release film from one side of the reflective layer of the radiative cooling membrane, and adhere the waterproof butyl adhesive to the treated concrete surface. Lay it horizontally from top to bottom, with two rolls of membrane overlapping each other by 10cm. The radiative cooling membrane is 1200mm wide. When laying it horizontally on structures such as roofs, the boundary of the upper membrane overlaps with the boundary of the lower membrane by 8-10cm at the junction of two rolls. This ensures seamless splicing between the membranes and is more conducive to preventing erosion of the membrane by rain and other natural weather conditions.

[0043] Example 2

[0044] 1) Use an angle grinder to remove protrusions from the concrete surface and fill large pitted areas with silicone sealant.

[0045] 2) Mix potassium silicate surface hardener (potassium silicate water glass, modulus 3.9, Shandong Xinghai Chemical) with water at a ratio of 1:0.4. Spray the first coat until the surface is saturated. The second coat is mainly for touching up unabsorbed areas. Make the entire surface saturated and moist.

[0046] 3) After drying, rinse the concrete surface with a high-pressure water gun to ensure that there is no sand or dust on the surface. If there is dirt, you can use a brush or other acidic or alkaline cleaner to wipe it off.

[0047] 4) Apply solvent-based epoxy resin interface treatment agent (Hempadur 45141, Hempal) evenly to the cleaned concrete surface.

[0048] 5) Remove the release film from one side of the reflective layer of the radiation cooling film, and stick the waterproof butyl adhesive to the treated concrete surface. Lay the film horizontally from top to bottom, using two rolls of film with the edges joined 10cm apart.

[0049] Comparative Example 1:

[0050] Remove the release film from one side of the reflective layer of the radiation cooling film, and stick the polyester adhesive to the concrete surface. Do not overlap the two rolls of film; seal the edges between them with silicone sealant.

[0051] Comparative Example 2:

[0052] 1) Use an angle grinder to remove protrusions from the concrete surface and fill large pitted areas with silicone sealant.

[0053] 2) Rinse the concrete surface with a high-pressure water gun to ensure that there is no sand or dirt on the surface.

[0054] 3) Mix the water-based epoxy resin interface treatment agent and the curing agent in a 4:1 ratio, then add 5-15% water and apply evenly to the cleaned concrete surface.

[0055] 4) Remove the release film from one side of the reflective layer of the radiation cooling film, and stick the butyl adhesive onto the waterproof membrane. Lay it horizontally from top to bottom, with the two rolls of film joined together at 10cm from the edge.

[0056] Comparative Example 3

[0057] 1) Use an angle grinder to remove protrusions from the concrete surface and fill large pitted areas with silicone sealant.

[0058] 2) Mix sodium silicate surface hardener with cement and water in a ratio of 1:1:0.5. Apply the mixture to a smooth concrete surface by sandblasting for the first time, and then roll it onto the surface for the second time to ensure that the entire surface is saturated and moistened.

[0059] 3) Rinse the concrete surface with a high-pressure water gun to ensure that there is no sand or dirt on the surface.

[0060] 4) Remove the release film from one side of the reflective layer of the radiation cooling film, and stick the butyl adhesive onto the waterproof membrane. Lay it horizontally from top to bottom, with the two rolls of film joined together at 10cm from the edge.

[0061] Table 1. Peel strength of the radiation cooling films in Examples 1-2 and Comparative Examples 1-3

[0062]

[0063] Compared to the example, the comparative radiative cooling film is uneven, delaminates quickly under high humidity and heat, has poor peel strength, and easily leaves adhesive residue, making repairs troublesome. In practical applications, it is prone to detachment under extreme weather conditions such as wind, rain, and snow. In contrast, the example ensures that the laid radiative cooling film is flat and firmly adhered, maintaining an application period of more than 8 years even in extreme weather conditions.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure, characterized in that, Includes the following steps: S1 Grinding and Filling: Grind down the sharp protrusions on the concrete enclosure structure with an angle grinder and fill them with silicone sealant to make them smooth; S2 Surface Hardening Treatment: Spray or roll on a surface hardener. S3 Cleaning: After drying, use a high-pressure water gun to clean the concrete surface; S4 interface treatment agent surface treatment: roller coating of interface treatment agent; S5 Film Application: Lay a radiative cooling film. One side of the radiative cooling film is provided with an adhesive layer and a release protective film from the inside to the outside. After removing the release protective film, the radiative cooling film is adhered to the concrete treated in step S4 through the adhesive layer.

2. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 1, characterized in that, Step S2 specifically involves mixing a surface hardener with water and then spraying or rolling it onto the concrete treated in step S1. The surface hardener includes silicates.

3. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 2, characterized in that, The silicate is sodium silicate, potassium silicate, or lithium silicate.

4. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 3, characterized in that, The ratio of sodium silicate to water is 1:0.5 to 1, and the ratio of potassium silicate to water is 1:0.3 to 0.

5.

5. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 2, characterized in that, The surface hardener is a mixture of sodium silicate and cement, wherein the mass ratio of sodium silicate to cement is 1:

1.

6. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 1, characterized in that, The interface treatment agent mentioned in step S4 is an epoxy resin emulsion. The epoxy resin emulsion is one or more combinations of solvent-based epoxy resin emulsion, waterborne epoxy resin emulsion, high-solids epoxy resin emulsion, and modified epoxy resin emulsion. The waterborne epoxy resin emulsion includes waterborne epoxy resin and curing agent, and the ratio of waterborne epoxy resin to curing agent is 4:

1.

7. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 6, characterized in that, The waterborne epoxy resin interface treatment agent and the waterborne epoxy curing agent are mixed in a certain proportion, and then water with a mass percentage of 5-15% is added.

8. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 7, characterized in that, The coating thickness of the interface treatment agent is 1.5-3 mm.

9. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 1, characterized in that, The adhesive backing of the radiation cooling film is butyl waterproof adhesive, and the thickness of the adhesive backing is 700-900um.

10. The method for constructing a radiant cooling film on the outer layer of a concrete enclosure structure according to claim 9, characterized in that, The radiation cooling film is laid horizontally, with the boundary of the upper film overlapping the boundary of the lower film by 8-10 cm at the junction of two rolls.

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