Type-II anhydrous gypsum fireproof coating with high later strength and large spraying area and preparation method of type-II anhydrous gypsum fireproof coating

Abstract

The invention belongs to the field of building materials, and particularly relates to a type II anhydrite fireproof coating with high later strength and large spraying area and a preparation method thereof, and the type II anhydrite fireproof coating is prepared from the following raw materials: type II anhydrite, building gypsum, cement, glass beads, sepiolite, hydroxypropyl methyl cellulose, rubber powder, starch ether, sulfate and an air entraining agent. The II-type anhydrous gypsum fireproof coating with high later-stage strength and large spraying area obtained by the invention has the advantages of large spraying area, high later-stage strength, reduced total cost and stable later-stage overall strength, and solves the problems of poor early-stage strength of a cement fireproof coating and poor later-stage strength of a desulfurized gypsum fireproof coating. When the coating thickness is the same as that of a cement fireproof coating and a desulfurized gypsum fireproof coating, the density is low after water is evaporated, the heat conductivity coefficient is low, and the heat insulation performance is good. The fireproof insulation board has good fireproof performance, can keep structural integrity and stability at high temperature, has longer fire endurance than cement and desulfurized gypsum at the same temperature, and plays roles in effectively preventing fire, isolating and delaying fire spreading.

Description

Technical Field

[0001] The present application belongs to the field of building materials, and in particular relates to a type II anhydrous gypsum fire retardant coating with high later strength and large spraying area and a preparation method thereof. Background Art

[0002] There are two main types of fire retardant coatings on the market: one is cement-based fire retardant coatings, and the other is desulfurized gypsum fire retardant coatings. The main raw materials of cement-based fire retardant coatings are cement, vitrified microspheres, sepiolite, and auxiliary materials such as rubber powder, starch ether, etc. as admixture materials. They are evenly mixed in a mixer, packaged, and sent to the construction site. On the construction site, according to a certain amount of water, it is sprayed on the indoor steel structure. The main raw materials of desulfurized gypsum fire retardant coatings are desulfurized gypsum, vitrified microspheres, and sepiolite. The auxiliary materials are rubber powder, starch ether, retarder, etc. as admixture materials. They are evenly mixed in a mixer, packaged, and sent to the construction site. On the construction site, according to a certain amount of water, it is sprayed on the indoor steel structure.

[0003] One of the problems in the construction of cement fire retardant coatings is that cement-based fire retardant coatings have low early strength, are not suitable for early solidification on steel structures, are not suitable for large-area spraying, and have a small construction area under the same mass and volume.

[0004] Desulfurized gypsum-based fire-retardant coatings have the problem of poor later strength and fail to meet standard requirements, and are not suitable for large-area spraying.

[0005] Therefore, it is necessary to find a fire retardant coating with good early and late strength and relatively stable overall strength to solve the above problems. Summary of the invention

[0006] In order to solve the above technical problems existing in the prior art, the present application provides a type II anhydrous gypsum fire retardant coating with high late strength and large spraying area and a preparation method thereof, which is specifically achieved through the following technical scheme:

[0007] The invention discloses a type II anhydrous gypsum fireproof coating with high later strength and large spraying area, which is composed of the following raw materials: type II anhydrous gypsum, building gypsum, vitrified microspheres, sepiolite, cement, hydroxypropyl methyl cellulose, rubber powder, starch ether, sulfate and air entraining agent.

[0008] Further, the weight proportions of raw materials are as follows: 300-400 parts of type II anhydrous gypsum, 200-300 parts of building gypsum, 200-300 parts of vitrified microspheres, 50-100 parts of sepiolite, 20-50 parts of cement, 1-5 parts of hydroxypropyl methylcellulose, 5-10 parts of rubber powder, 0.3-0.5 parts of starch ether, 3-5 parts of sulfate, and 0.2-0.3 parts of foaming agent. Preferably, the weight proportions of raw materials are as follows: 437.3 parts of type II anhydrous gypsum, 200 parts of building gypsum, 250 parts of vitrified microspheres, 70 parts of sepiolite, 30 parts of cement, 3 parts of hydroxypropyl methylcellulose, 8 parts of rubber powder, 0.5 parts of starch ether, 1 part of sulfate, and 0.2 parts of foaming agent.

[0009] Furthermore, the type II anhydrous gypsum is type II anhydrous gypsum powder, which is a powder material obtained by grinding and modifying type II anhydrous gypsum calcined at 600-800°C.

[0010] Furthermore, the building gypsum is a building gypsum obtained by calcining phosphogypsum at 150-200° C. Adding the building gypsum can fully stimulate the strength of type II anhydrous gypsum and improve the strength of the coating at an early stage.

[0011] The method for preparing the type II anhydrous gypsum fire retardant coating with high late strength and large spraying area comprises the following steps:

[0012] (1) Material preparation: weigh type II anhydrous gypsum, building gypsum, vitrified microspheres, sepiolite, cement, hydroxypropyl methyl cellulose, rubber powder, starch ether, sulfate, air entraining agent and other raw materials according to weight ratio;

[0013] (2) Mixing: Add water to the weighed material and stir evenly before use.

[0014] Furthermore, in step (2), the ratio of material to water is 1:1.

[0015] The method for using the type II anhydrous gypsum fire retardant coating with high later strength and large spraying area is to mix it with water and then directly spray it on the indoor steel structure.

[0016] Compared with the prior art, the technical effects created by this application are embodied in:

[0017] The type II anhydrous gypsum fire retardant coating with high late strength and large spraying area of ​​the present application is mainly composed of type II anhydrous gypsum, and the strength of type II anhydrous gypsum is stimulated by building gypsum and the overall strength of the coating in the early stage is improved; the strength of type II anhydrous gypsum is further stimulated by sulfate; the foaming effect is played by air entraining agent to increase the spraying area; the late strength is improved by cement and glue powder, and the glue powder is used to make it more firm when sprayed on the steel structure. The type II anhydrous gypsum fire retardant coating with high late strength and large spraying area finally obtained has a large spraying area, high late strength, reduced cost, and relatively stable overall strength in the early and late stages, which solves the problem of poor early strength of cement fire retardant coating and poor late strength of desulfurized gypsum fire retardant coating. When the coating thickness is the same as that of cement fire retardant coating and desulfurized gypsum fire retardant coating, the water evaporates and the density is light, the thermal conductivity is low, and it also has good thermal insulation performance. It has excellent fire resistance and can maintain structural integrity and stability at high temperatures. Its fire resistance limit is longer than that of cement and desulfurized gypsum at the same temperature, and it plays an effective role in fire isolation and delaying the spread of fire. DETAILED DESCRIPTION

[0018] The technical solution of the present application is further limited below in conjunction with specific implementation methods, but the scope of protection required is not limited to the description.

[0019] Example 1

[0020] A type II anhydrous gypsum fire retardant coating with high later strength and large spraying area is composed of the following raw materials: 405.3 kg of type II anhydrous gypsum, 200 kg of building gypsum, 260 kg of vitrified microspheres, 70 kg of sepiolite, 50 kg of cement, 3 kg of hydroxypropyl methyl cellulose, 8 kg of rubber powder, 0.5 kg of starch ether, 3 kg of sulfate, and 0.2 kg of air entraining agent.

[0021] The type II anhydrous gypsum is type II anhydrous gypsum powder, specifically, type II anhydrous gypsum obtained by calcining phosphogypsum at 600-800° C., and then grinding and modifying the obtained powder material.

[0022] Example 2

[0023] A type II anhydrous gypsum fire retardant coating with high later strength and large spraying area is composed of the following raw materials: 426.2 kg type II anhydrous gypsum, 200 kg building gypsum, 250 kg vitrified microspheres, 70 kg sepiolite, 40 kg cement, 3 kg hydroxypropyl methyl cellulose, 8 kg rubber powder, 0.5 kg starch ether, 2 kg sulfate, and 0.3 kg air entraining agent.

[0024] The type II anhydrous gypsum is type II anhydrous gypsum powder, specifically, type II anhydrous gypsum obtained by calcining phosphogypsum at 600-800° C., and then grinding and modifying the obtained powder material.

[0025] Example 3

[0026] A type II anhydrous gypsum fire retardant coating with high later strength and large spraying area is composed of the following raw materials: 405.3 kg of type II anhydrous gypsum, 200 kg of building gypsum, 270 kg of vitrified microspheres, 70 kg of sepiolite, 40 kg of cement, 3 kg of hydroxypropyl methyl cellulose, 8 kg of rubber powder, 0.5 kg of starch ether, 3 kg of sulfate, and 0.2 kg of air entraining agent.

[0027] The type II anhydrous gypsum is type II anhydrous gypsum powder, specifically, type II anhydrous gypsum obtained by calcining phosphogypsum at 60-800° C. and then grinding and modifying the obtained powder material.

[0028] The performance test results of each embodiment and comparative example are as follows:

[0029]

[0030] From the above, it can be seen that the compressive strength of the Type II anhydrous gypsum fire retardant coating of the present application after drying is 2-2.5MPa, which is much higher than the clear standard strength of 0.5MPa.

[0031] The type II anhydrous gypsum fire retardant coating of the present application has a spraying area of ​​200-250m 2 / ton, and the cement spraying area is generally 80-100m 2 / ton.

[0032] Finally, it should be pointed out that the above embodiments are only representative examples of the present application. Obviously, the technical solution of the present application is not limited to the above embodiments, and there may be many variations. All variations that can be directly derived or associated with the contents disclosed in the present application by a person of ordinary skill in the art should be considered as the protection scope of the present application.

Claims

1. A type II anhydrous gypsum fire retardant coating with high late strength and large spraying area, characterized in that: The invention is composed of the following raw materials: type II anhydrous gypsum, building gypsum, cement, vitrified microspheres, sepiolite, hydroxypropyl methylcellulose, rubber powder, starch ether, sulfate and air entraining agent.

2. The type II anhydrous gypsum fire retardant coating with high late strength and large spraying area according to claim 1, characterized in that: The weight proportions of the raw materials are as follows: 300-400 parts of type II anhydrous gypsum, 100-200 parts of building gypsum, 200-300 parts of vitrified microspheres, 50-100 parts of sepiolite, 30-50 parts of cement, 1-5 parts of hydroxypropyl methyl cellulose, 5-10 parts of rubber powder, 0.1-0.5 parts of starch ether, 1-3 parts of sulfate, and 0.2-0.3 parts of air entraining agent.

3. The type II anhydrous gypsum fire retardant coating with high late strength and large spraying area according to claim 1, characterized in that: The weight proportions of the raw materials are as follows: 437.2 parts of type II anhydrous gypsum, 200 parts of building gypsum, 250 parts of vitrified microspheres, 70 parts of sepiolite, 30 parts of cement, 3 parts of hydroxypropyl methyl cellulose, 8 parts of rubber powder, 0.5 parts of starch ether, 1 part of sulfate, and 0.3 parts of air entraining agent.

4. The type II anhydrous gypsum fire retardant coating with high late strength and large spraying area according to claim 1, characterized in that: The type II anhydrous gypsum is type II anhydrous gypsum powder.

5. The type II anhydrous gypsum fire retardant coating with high late strength and large spraying area according to claim 4, characterized in that: The type II anhydrous gypsum powder is a powder material obtained by grinding and modifying the type II anhydrous gypsum obtained by calcining phosphogypsum at 600-800°C.

6. The type II anhydrous gypsum fire retardant coating with high late strength and large spraying area according to claim 1, characterized in that: The building gypsum is obtained by calcining phosphogypsum at 150-200°C as a raw material.

7. The method for preparing the type II anhydrous gypsum fire retardant coating with high late strength and large spraying area as claimed in claim 1, characterized in that: The steps include: (1) Material preparation: weigh type II anhydrous gypsum, building gypsum, vitrified microspheres, sepiolite, cement, hydroxypropyl methyl cellulose, rubber powder, starch ether, sulfate, air entraining agent and other raw materials according to weight ratio; (2) Mixing: Add water to the weighed material and stir evenly before use.

8. The method for preparing the type II anhydrous gypsum fire retardant coating with high late strength and large spraying area according to claim 7, characterized in that: In the step (2), the ratio of material to water is 1:

1.

9. The method for using the type II anhydrous gypsum fire retardant coating with high late strength and large spraying area as claimed in claim 1, characterized in that: After mixing it with water, spray it directly on the indoor steel structure.

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