Anhydrous gypsum-based terrazzo floor material and preparation method thereof

Abstract

The invention belongs to the field of building materials, and particularly relates to an anhydrous gypsum-based terrazzo floor material and a preparation method thereof. The anhydrite-based terrazzo floor material is prepared from the following raw materials: anhydrite, quenched stone, building gypsum, ash calcium, potassium sulfate, calcium formate, a water reducing agent, a defoaming agent, rubber powder and hydroxypropyl methyl cellulose. The invention relates to a building material, which is prepared from the following raw materials in parts by weight: 525 to 550 parts of anhydrite, 350 to 450 parts of quenched stone, 30 to 40 parts of building gypsum, 15 to 20 parts of ash calcium, 4 to 7 parts of potassium sulfate, 0.5 to 0.8 part of potassium acid calcium, 1.5 to 2.0 parts of water reducing agent, 0.4 to 0.6 part of defoaming agent, 0.10 to 0.15 part of hydroxypropyl methyl cellulose and 6 to 8 parts of rubber powder. The anhydrous gypsum-based terrazzo floor material is high in early strength and low in cost compared with a cement-based inorganic terrazzo in a construction period. The development of companies is facilitated, and the product is more competitive in the market.

Description

Technical Field

[0001] This application belongs to the field of building materials, and in particular relates to an anhydrous gypsum-based terrazzo flooring material and its preparation method. Background Technology

[0002] Currently, the inorganic grinding stones on the market are mainly cement-based inorganic grinding stones. The main raw materials are ordinary quenching stone, 425 cement, and special cement, with auxiliary materials including titanium dioxide, calcium formate, water-reducing agent, hydroxypropyl methylcellulose, heavy calcium carbonate, defoamer, and building gypsum. The mixture is uniformly mixed in a mixer, packaged, and shipped to the construction site. At the construction site, a certain amount of water is added. After construction, once the strength reaches approximately 30 MPa after 2-3 days, it is polished using a polishing machine.

[0003] Currently, cement-based inorganic terrazzo has the following shortcomings: (1) High cost and complex construction procedures. It costs about 250-300 yuan per square meter to construct one square meter, which is unacceptable to real estate developers in the current sluggish construction market; (2) Using cement as a cementing material results in low early strength, requiring at least 2-3 days for the strength to rise, which leads to a longer construction period; (3) The biggest drawback of cement-based inorganic terrazzo is that it is prone to expansion or contraction, which can easily cause hollowing and cracking. In addition, the use of cement requires quarrying, which is contrary to the national environmental protection policy.

[0004] Therefore, it is necessary to find an anhydrous gypsum inorganic grinding stone that can be used in large quantities with Type II anhydrous gypsum, has high early strength, and has a lower cost compared to cement-based inorganic grinding stone in terms of construction period, in order to solve the above problems. Summary of the Invention

[0005] To address the aforementioned technical problems in the existing technology, this application provides anhydrous gypsum-based terrazzo flooring material and its preparation method, specifically achieved through the following technical solution: An anhydrous gypsum-based terrazzo flooring material is composed of the following raw materials: anhydrous gypsum, quenched stone, building gypsum, lime, potassium sulfate, calcium formate, water-reducing agent, defoamer, adhesive powder, and hydroxypropyl methylcellulose.

[0006] Further, the raw materials are in the following weight proportions: anhydrous gypsum 525-550 parts, quenching stone 350-450 parts, building gypsum 30-40 parts, lime 15-20 parts, potassium sulfate 4-7 parts, calcium potassium 0.5-0.8 parts, water-reducing agent 1.5-2.0 parts, defoamer 0.4-0.6 parts, hydroxypropyl methylcellulose 0.10-0.15 parts, and adhesive powder 6-8 parts. Preferably, the proportions are: anhydrous gypsum 532.2 parts, quenching stone 400 parts, building gypsum 34.7 parts, lime 17.4 parts, potassium sulfate 5.8 parts, calcium potassium 0.58 parts, water-reducing agent 1.74 parts, defoamer 0.46 parts, hydroxypropyl methylcellulose 0.12 parts, and adhesive powder 6.94 parts.

[0007] Furthermore, the anhydrous gypsum is type II anhydrous gypsum. The type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at 600-800℃ to obtain type II anhydrous gypsum, and then grinding and modifying it.

[0008] Furthermore, the building gypsum mentioned above is a building gypsum obtained by calcining phosphogypsum at 150-200℃.

[0009] The preparation method of the above-mentioned anhydrous gypsum-based terrazzo flooring material includes the following steps: (1) Material preparation: Weigh the raw materials such as anhydrous gypsum, quenching stone, building gypsum, lime, potassium sulfate, calcium formate, water reducing agent, defoamer, adhesive powder, and hydroxypropyl methylcellulose according to the weight ratio; (2) Mixing: Add water to the weighed materials and stir evenly. After casting into shape, grind and polish.

[0010] Furthermore, in step (2), the amount of water added is 28%-30%.

[0011] Compared with the prior art, the technical effects created by this application are reflected in: 1. This application can use adhesive powder to replace hydroxypropyl methylcellulose because adhesive powder is cheaper than hydroxypropyl methylcellulose, and adhesive powder has better performance than hydroxypropyl methylcellulose in anhydrous gypsum-based terrazzo flooring materials. In addition, it can eliminate the need for additives such as retarders.

[0012] 2. This application uses Type II anhydrous gypsum to replace cement in the production of anhydrous gypsum-based terrazzo flooring materials. With the addition of a certain amount of activator, the anhydrous gypsum exhibits rapid early strength improvement, reaching approximately 30 MPa within 24 hours before proceeding to the next construction step. In contrast, cement-based terrazzo requires 2-3 days to reach a strength of approximately 30 MPa, causing delays in the construction period.

[0013] 3. The type II anhydrous gypsum used in this application has a lower bulk density than cement under the same conditions, and has certain advantages in terms of building materials after construction.

[0014] 4. Under the condition that the production process remains unchanged, the key indicators of the products produced by the method of this patent can be improved while the cost is significantly reduced. Moreover, the raw material used for anhydrous phosphogypsum of type II phosphorus is industrial solid waste phosphogypsum, which can also dispose of solid waste and assist the implementation of the national "dual carbon" strategy. The implementation of this patent can simultaneously achieve significant economic, social and ecological benefits. Detailed Implementation

[0015] The technical solution of this application will be further defined below with reference to specific implementation methods, but the scope of protection is not limited to the description.

[0016] Example 1 An anhydrous gypsum-based terrazzo flooring material is prepared by the following method: (1) Material preparation: Weigh out 532.2 kg of anhydrous gypsum, 400 kg of quenching stone, 34.7 kg of building gypsum, 17.4 kg of lime, 5.8 kg of potassium sulfate, 0.58 kg of calcium potassium phosphate, 1.74 kg of water-reducing agent, 0.46 kg of defoamer, 0.12 kg of hydroxypropyl methylcellulose, and 6.94 kg of adhesive powder; (2) Mixing: Add water to the weighed materials and stir evenly. After casting into shape, grind and polish.

[0017] The aforementioned Type II anhydrous gypsum is Type II anhydrous gypsum powder, specifically a powder material obtained by calcining phosphogypsum at 600-800℃ to obtain Type II anhydrous gypsum, and then grinding and modifying it.

[0018] Example 2 An anhydrous gypsum-based terrazzo flooring material is prepared by the following method: (1) Preparation of materials: Weigh 525 kg of anhydrous gypsum, 450 kg of quenching stone, 40 kg of building gypsum, 20 kg of lime, 7 kg of potassium sulfate, 0.8 kg of calcium potassium phosphate, 2.0 kg of water-reducing agent, 0.6 kg of defoamer, 0.15 kg of hydroxypropyl methylcellulose, and 8 kg of adhesive powder; (2) Mixing: Add water to the weighed materials and stir evenly. After casting into shape, grind and polish.

[0019] The aforementioned Type II anhydrous gypsum is Type II anhydrous gypsum powder, specifically a powder material obtained by calcining phosphogypsum at 600-800℃ to obtain Type II anhydrous gypsum, and then grinding and modifying it.

[0020] Example 3 An anhydrous gypsum-based terrazzo flooring material is prepared by the following method: (1) Preparation of materials: Weigh 550kg of anhydrous gypsum, 350kg of quenching stone, 30kg of building gypsum, 15kg of lime, 4kg of potassium sulfate, 0.5kg of calcium potassium phosphate, 1.5kg of water-reducing agent, 0.4kg of defoamer, 0.10kg of hydroxypropyl methylcellulose, and 6kg of adhesive powder; (2) Mixing: Add water to the weighed materials and stir evenly. After casting into shape, grind and polish.

[0021] The aforementioned Type II anhydrous gypsum is Type II anhydrous gypsum powder, specifically a powder material obtained by calcining phosphogypsum at 600-800℃ to obtain Type II anhydrous gypsum, and then grinding and modifying it.

[0022] The anhydrous gypsum-based terrazzo flooring material obtained in Example 1 of this application was tested, and the specific test indicators and results are as follows: Specific testing indicators

[0023] Specific test results

[0024] Finally, it should be noted that the above embodiments are merely representative examples of this application. Obviously, the technical solutions of this application are not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this application should be considered within the scope of protection of this application.

Claims

1. A waterless gypsum-based terrazzo flooring material, characterized in that, It is composed of the following raw materials: anhydrous gypsum, quenching stone, building gypsum, lime, potassium sulfate, calcium formate, water reducing agent, defoamer, adhesive powder, and hydroxypropyl methylcellulose.

2. The anhydrous gypsum-based terrazzo flooring material according to claim 1, characterized in that, The raw materials are as follows by weight: 525-550 parts anhydrous gypsum, 350-450 parts quenching stone, 30-40 parts building gypsum, 15-20 parts lime, 4-7 parts potassium sulfate, 0.5-0.8 parts calcium potassium acid, 1.5-2.0 parts water-reducing agent, 0.4-0.6 parts defoamer, 0.10-0.15 parts hydroxypropyl methylcellulose, and 6-8 parts adhesive powder.

3. The anhydrous gypsum-based terrazzo flooring material according to claim 1, characterized in that, The raw materials are as follows by weight: 532.2 parts anhydrous gypsum, 400 parts quenching stone, 34.7 parts building gypsum, 17.4 parts lime, 5.8 parts potassium sulfate, 0.58 parts calcium potassium phosphate, 1.74 parts water-reducing agent, 0.46 parts defoamer, 0.12 parts hydroxypropyl methylcellulose, and 6.94 parts adhesive powder.

4. The anhydrous gypsum-based terrazzo flooring material according to claim 1, characterized in that, The anhydrous gypsum is type II anhydrous gypsum.

5. The anhydrous gypsum-based terrazzo flooring material according to claim 4, characterized in that, The type II anhydrous gypsum is a powder material obtained by calcining phosphogypsum at 600-800℃ to obtain type II anhydrous gypsum, and then grinding and modifying it.

6. The anhydrous gypsum-based terrazzo flooring material according to claim 1, characterized in that, The building gypsum mentioned above is a building gypsum obtained by calcining phosphogypsum at 150-200℃.

7. The method for preparing the anhydrous gypsum-based terrazzo flooring material according to claim 1, characterized in that, Includes the following steps: (1) Material preparation: Weigh the raw materials such as anhydrous gypsum, quenching stone, building gypsum, lime, potassium sulfate, calcium formate, water reducing agent, defoamer, adhesive powder, and hydroxypropyl methylcellulose according to the weight ratio; (2) Mixing: Add water to the weighed materials and stir evenly. After casting into shape, grind and polish.

8. The method for preparing the anhydrous gypsum-based terrazzo flooring material according to claim 7, characterized in that, In step (2), the amount of water added is 28%-30%.

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