A gypsum-based composition, a gypsum slurry, and a building component

Abstract

Provided is a gypsum-based composition, comprising the following components in part by weight: 500-1000 parts of a gypsum; 100-225 parts of an aggregate; 50-225 parts of a sepiolite fiber; 1-12 parts of a cellulose; and at least 0.1 part of an additive. The present invention utilizes a sepiolite in combination with a gypsum material to prepare a fire-proof coating, which significantly increases the water-powder ratio, achieves the lightweight property of the material, and has excellent fire resistance performance, crack resistance performance, shrinkage resistance performance and high coverage rate.

Description

[0001] A Gypsum-based composition, a gypsum slurry, and a building component

[0002] Technical Field

[0003] The present invention relates to a building material, and particularly to a gypsum-based composition.

[0004] In the construction industry, steel structure is the main load-bearing member, which is noncombustible, but has poor fire resistance performance, and has a fire resistance limit of only 15 minutes under the condition of direct flame burning. The macroscopic performance is that the building loses its supporting capacity and collapses. Therefore, it is very important to perform fireproof treatment on a steel structure. In the treatment process, a fire-proof coating is widely used due to its advantages of convenient use, shape independence, excellent fireproof performance and the like.

[0005] An object of the present invention is to provide a building structure, especially a fire-proof coating applied to a steel structure.

[0006] Therefore, according to an aspect of the present invention, provided is a gypsum-based composition comprising the following components in part by weight: 500-1000 parts of a gypsum; 100-225 parts of an aggregate; 50-225 parts of a sepiolite fiber; 1-12 parts of a cellulose; and at least 0.1 part of an additive. wherein the gypsum is an anhydrite, a gypsum hemihydrate, a gypsum dihydrate, or any combination thereof. wherein the aggregate is a lightweight aggregate, which is an expanded perlite, an expanded vermiculite, or a combination thereof. wherein the cellulose or a derivative thereof is selected from sodium carboxymethyl cellulose, methyl cellulose, hydroxy ethyl methylcellulose, and hydroxypropyl methylcellulose. wherein the additive comprises an air entraining agent and a retarder. Further, the air entraining agent is 0.1 -2 parts and is selected from sodium dodecyl sulfate, sulfobenzenesulfonate and fatty alcohol sulfonate. Further, the retarder is 0.1-5 parts and is selected from lignosulfonate, protein-based retarder, sodium hexametaphosphate, sodium polyphosphate, citric acid, sodium citrate, tartaric acid, potassium tartrate, acrylic acid and sodium acrylate.

[0007] According to another aspect of the present invention, provided is a gypsum slurry comprising the gypsum-based composition as described above and water, wherein the weight ratio of the gypsum-based composition to water is 1 : 1-1.4.

[0008] According to another aspect of the present invention, provided is a building component having a building body, wherein a surface of the building body is provided with a coating, and the coating is formed by drying the aforementioned gypsum slurry.

[0009] Further provided is a building component has a fireproof performance of at least 3 hours under the conditions specified by the national standard GB 14907 “Fire-proof Coatings for Steel Structures”.

[0010] The present invention utilizes the sepiolite fiber in combination with the gypsum material to prepare a fire-proof coating, which significantly increases the water-powder ratio, achieves the lightweight property of the material, and has excellent fire resistance performance, crack resistance performance, shrinkage resistance performance, bending resistance performance and high coverage rate.

[0011] Detailed Description

[0012] Specific embodiments of the present invention are described below.

[0013] According to an embodiment of the invention, the gypsum-based composition comprises a gypsum, an aggregate, a sepiolite fiber, a cellulose or a derivative thereof and an additive.

[0014] The part by weight of the gypsum is 500-1000. In the present invention, the gypsum may be a gypsum hemihydrate, a gypsum dihydrate, or a combination thereof. The gypsum may also be an activated anhydrite. In the example of anhydrite as used, the anhydrite is usually partially activated. In this case, an inactivated anhydrite may serve as part of the aggregate.

[0015] The aggregate may be a lightweight aggregate or a heavyweight aggregate, or it may be a coarse aggregate or a fine aggregate, or a combination of a plurality of aggregates, with total part by weight of 100-225. Preferably, the lightweight aggregate is employed to achieve light weight, such as an expanded perlite or an expanded vermiculite.

[0016] The sepiolite fiber may be any suitable commercially available material, and the inventors of the present application found through experiments that all currently commercially available sepiolite fiber products may be used in the technical solutions of the present invention. The part by weight of sepiolite fiber is 100-225.

[0017] The part by weight of the cellulose or derivative thereof is 1-10, which is used to improve the working performance of the product. The cellulose or derivative thereof may be sodium carboxymethyl cellulose, methyl cellulose, hydroxyethyl methylcellulose, or hydroxypropyl methylcellulose, or, in some examples, may be any combination of the foregoing chemicals.

[0018] The additive may include an air entraining agent and a retarder, and may also include other suitable chemicals to achieve different functions, such as a pigment, an adhesion promoter, etc. The content of the additive is at least 0.1 part by weight, and the specific content of the additive may be determined according to specific chemical formulation as used.

[0019] Further, the part by weight of the air entraining agent is 0.1-2, which may be sodium dodecyl sulfate, sulfobenzenesulfonate or fatty alcohol sulfonate, or any combination thereof. The part by weight of the retarder is 0.1-5, which may be any one or any combination of lignosulfonate, protein-based retarder, sodium hexametaphosphate, sodium polyphosphate, citric acid, sodium citrate, tartaric acid, potassium tartrate, acrylic acid and sodium acrylate. The part by weight of the adhesion promoter is 0-40, which may be a phenolic resin, a redispersible latex powder or a combination thereof.

[0020] In accordance with another embodiment of the present invention, provided is a gypsum slurry comprising the aforementioned gypsum-based composition and water, wherein the weight ratio of the gypsum-based composition to water is from 1 : 1 to 1 : 1.4, i.e., the water-to- gypsum ratio is from 1 to 1.4.

[0021] According to another embodiment of the present invention, provided is a building component having a building body, wherein a surface of the building body is provided with a coating, and the coating is formed by drying the aforementioned gypsum slurry. The building component body is preferably a steel structural member. The building component has a fire resistance performance of at least 3 hours. Examples

[0022] Several examples are given below, and Table 1 lists the specific materials of each component in these examples.

[0023] The materials listed in Table 1 were uniformly mixed according to the given parts by weight to obtain a powder mixture which was mixed with water according to the given water- to-gypsum ratio in Table 2 to obtain a slurry. The resulting slurry was applied to the surface of the steel structure body. The fireproof performance was tested according to the method specified in the national standard GB 14907. The results of the fire tests of each example are shown in Table 3. Table 1

[0024] Table 2

[0025] Table 3 As shown in Table 3, the composition of the present application has a low density and meets the requirement of light weight. Meanwhile, the coating formed by the technical solution of the present application has high strength. In addition, the solution of the present application can meet the fireproof performance requirements of 3 hours under the conditions specified by the national standard GB 14907 “Fire-proof Coatings for Steel Structures”.

[0026] In the above description, details of the technical solutions of the present invention are described. However, those skilled in the art can understand that the present invention is not limited to the specific details listed in the above embodiments, but can vary within the scope defined by the claims.

Claims

Claims1. A gypsum-based composition, comprising the following components, in part by weight: 500-1000 parts of a gypsum,100-225 parts of an aggregate,50-225 parts of a sepiolite fiber,1-12 parts of a cellulose, at least 0.1 part of an additive.

2. The gypsum-based composition according to claim 1, wherein the gypsum is an anhydrite, a gypsum hemihydrate, a gypsum dihydrate, or any combination thereof.

3. The gypsum-based composition according to claim 1, wherein the aggregate is a lightweight aggregate, which is an expanded perlite, an expanded vermiculite, or a combination thereof.

4. The gypsum-based composition according to claim 1, wherein the cellulose or a derivative thereof is selected from sodium carboxymethyl cellulose, methyl cellulose, hydroxy ethyl methylcellulose, and hydroxypropyl methylcellulose.

5. The gypsum-based composition according to claim 1, wherein the additive comprises an air entraining agent and a retarder.

6. The gypsum-based composition according to claim 5, wherein the air entraining agent is 0.1-2 parts and is selected from sodium dodecyl sulfate, sulfobenzenesulfonate, and fatty alcohol sulfonate.

7. The gypsum-based composition according to claim 5, wherein the retarder is 0.1-5 parts and is selected from lignosulfonate, protein-based retarder, sodium hexametaphosphate, sodium polyphosphate, citric acid, sodium citrate, tartaric acid, potassium tartrate, acrylic acid, and sodium acrylate.

8. A gypsum slurry comprising the gypsum-based composition according to any one of claims 1-7 and water, wherein the weight ratio of the gypsum-based composition to water is 1 : 1-1.4.

9. A building component having a building body, wherein the building body is provided with a coating, and the coating is formed by drying the gypsum slurry according to claim 8.

10. The building component according to claim 1, wherein the building component has a fireproof performance of at least 3 hours.

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