An intumescent fire-retardant coating for steel structures

Abstract

The utility model discloses an expansion type steel structure fire -retardant coating's tackiness composite layer, including steel structure base layer, the steel structure base layer outer wall has been coated with fire -retardant coating, the fire -retardant coating is coated gradually from inside to outside as primer layer, fire -retardant coating and finish layer, wherein the fire -retardant coating and primer layer between be equipped with transition layer, and transition layer surface has the concave and convex texture structure of random distribution. The utility model discloses an expansion type steel structure fire -retardant coating's tackiness composite layer adopts the concave and convex structure of dense random distribution formed on the surface of adsorption glue layer, increases the contact area and anchorage point density with fire -retardant coating, and after the solidification of fire -retardant coating, penetrates into recessed area, significantly promotes the shear and peeling strength, makes fire -retardant coating and primer layer better combination and prevents the drop.

Description

Technical Field

[0001] This utility model relates to the field of fire-retardant coating technology, specifically to an intumescent fire-retardant coating for steel structures with a thickening composite layer. Background Technology

[0002] Intumescent steel structure coating composite layer refers to an intumescent fireproof coating applied to the surface of a steel structure. When exposed to fire, it expands and foams to form a heat-insulating protective layer. Existing fireproof coatings, when brushed or sprayed onto the surface of steel structures, are prone to cracking and peeling due to insufficient adhesion, resulting in unsatisfactory fireproof performance.

[0003] This case arose in order to resolve the aforementioned issues. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an tackifying composite layer for intumescent fire-retardant coatings for steel structures, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an intumescent fireproof coating for steel structures with an tack-enhancing composite layer, comprising a steel structure base layer, wherein the outer wall of the steel structure base layer is coated with a fireproof coating, and the fireproof coating is coated from the inside out as a primer layer and a fireproof coating layer, wherein a transition layer is provided between the fireproof coating layer and the primer layer, and the surface of the transition layer has a randomly distributed uneven texture structure.

[0006] Preferably, the transition layer is an absorbent adhesive layer.

[0007] Preferably, the surface texture of the adsorbent layer consists of hard particles spread on the surface, which are embedded in the surface of the semi-cured wet paint film of the adsorbent layer.

[0008] Preferably, the hard particles are hollow glass microspheres.

[0009] Preferably, a sealing paint layer is applied between the fire-retardant coating and the topcoat layer.

[0010] After adopting the above technical solution, this utility model has the following advantages compared with the prior art: The tack-enhancing composite layer of the intumescent steel structure fireproof coating of this utility model adopts a dense, randomly distributed concave-convex structure on the surface of the adsorbent layer, which increases the contact area and anchor point density with the fireproof coating. After the fireproof coating is cured, it penetrates into the concave area, significantly improving the shear and peel strength, so that the fireproof coating and the base coating are better bonded and prevented from falling off. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the orthographic structure of this utility model.

[0012] In the diagram: 1. Steel structure base layer; 2. Primer layer; 3. Fireproof coating; 4. Topcoat layer; 5. Adhesive layer; 6. Particles; 7. Adhesive layer. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0014] like Figure 1 As shown: an intumescent fireproof coating for steel structures with a thickening composite layer, comprising a steel structure base layer 1, wherein the outer wall of the steel structure base layer 1 is coated with a fireproof coating, and is coated from the inside out as a primer layer 2, an intumescent fireproof coating layer 3 and a topcoat layer 4.

[0015] A transition layer is added between the fire-retardant coating 3 and the primer layer 2. The surface of the transition layer has a randomly distributed uneven texture, which increases the contact area and anchor point density with the fire-retardant coating 3. After the fire-retardant coating 3 is cured, it penetrates into the recessed area, significantly improving the shear and peel strength.

[0016] The transition layer is a conventional absorbent layer 5. The textured surface of the absorbent layer 5 can be formed by particles 6: the particles 6 can be loaded into a spreader with a screen and spread, the particles 6 are embedded in the surface of the wet paint film (semi-cured state), and the particles 6 are partially embedded in the paint film, forming a dense textured structure on the surface.

[0017] Particle 6 can be made of hollow glass microspheres of about 200μm. In the intumescent coating composite layer, it can maintain structural stability below 600℃. After high-temperature calcination, the molten glass microspheres absorb a large amount of heat and form a hard silica network skeleton, which covers the surface of the carbonized layer and prevents the carbon layer from falling off.

[0018] The textured structure of the transition layer can also be a fine sand layer: before the adhesive layer cures, fine sand particles are sprayed at high speed onto the surface of the wet paint film to form a randomly distributed textured surface.

[0019] After the fire-retardant coating 3 is completely dry, apply a thin layer of epoxy sealing paint 7, followed by the topcoat. This allows the adhesive layer 7 to penetrate and anchor while providing a compatible interface without affecting the fire-retardant performance. The optimal recoating window is within 72 hours after the fire-retardant coating 3 has fully dried. Beyond this timeframe, only light sanding to remove the surface oxide layer and loose dust is recommended.

[0020] The above-described embodiments are provided for illustrative purposes. Based on the above description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this utility model is not limited to the contents of the specification; its protection scope must be determined according to the claims.

Claims

1. A tackifying composite layer for an intumescent fire-retardant coating on steel structures, comprising a steel structure base layer, wherein the outer wall of the steel structure base layer is coated with a fire-retardant coating, characterized in that: The fire-retardant coating is applied from the inside out as a primer layer, a fire-retardant coating layer, and a topcoat layer, wherein a transition layer is provided between the fire-retardant coating layer and the primer layer, and the surface of the transition layer has a randomly distributed uneven texture structure.

2. The tackifying composite layer of the intumescent fireproof coating for steel structures according to claim 1, characterized in that: The transition layer is an adsorbent layer.

3. The tackifying composite layer of an intumescent fireproof coating for steel structures according to claim 2, characterized in that: The surface texture of the adsorbent layer consists of hard particles that are embedded in the surface of the semi-cured wet paint film.

4. The tackifying composite layer of an intumescent fireproof coating for steel structures according to claim 3, characterized in that: The hard particles are hollow glass microspheres.

5. The tackifying composite layer of an intumescent fireproof coating for steel structures according to claim 1, characterized in that: A sealing layer is applied between the fire-retardant coating and the topcoat layer.

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