A paper gypsum board accelerator and a method for preparing the same

Abstract

The application discloses a paper faced gypsum board accelerator and a preparation method thereof, and relates to the technical field of gypsum board accelerators. The paper faced gypsum board accelerator is prepared from the following components in proportion by weight: 92-96 parts of gypsum powder, 1-3 parts of attapulgite and 3-5 parts of sugar. The preparation method of the accelerator comprises the following steps: S1, grinding raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; S2, adding attapulgite into sugar and uniformly stirring and heating to obtain a mixture; S3, adding the mixture prepared in S2 into the gypsum powder prepared in S1 and performing grinding and stirring; and S4, performing drying to obtain the accelerator. Sugar can make crystals grow rapidly and reduce the initial setting time; the high adsorption capacity of attapulgite can make sugar more uniformly distributed, accelerate crystal growth and reduce the final setting time; and attapulgite makes sugar and raw gypsum more closely combined, thereby improving the breaking load of the paper faced gypsum board.

Description

Technical Field

[0001] This application relates to the field of gypsum board setting accelerators, and in particular to paper-faced gypsum board setting accelerators and their preparation methods. Background Technology

[0002] The main function of gypsum board accelerators is to accelerate the setting process of gypsum, thereby shortening the production cycle and improving production efficiency. In the manufacturing process of paper-faced gypsum board, finely ground dihydrate gypsum (raw gypsum) is commonly used as an accelerator. However, currently, in the preparation of paper-faced gypsum board, adding too little accelerator results in long initial and final setting times and low hydration rates; adding too much leads to a decrease in the final strength of the prepared gypsum board. Therefore, it is necessary to develop a new accelerator that can shorten the initial and final setting times and achieve higher final strength in the gypsum board preparation process. Summary of the Invention

[0003] To solve at least one of the above-mentioned technical problems, a setting accelerator is developed to enable paper-faced gypsum board to have short initial and final setting times during the preparation process and high final strength. This application provides a paper-faced gypsum board setting accelerator and its preparation method.

[0004] On the one hand, the paper-faced gypsum board accelerator provided in this application is made of the following components in parts by weight: 92-96 parts of gypsum powder, 1-3 parts of attapulgite clay and 3-5 parts of sugar.

[0005] Optionally, the weight ratio of attapulgite clay to sugar is 1:(1.5-2).

[0006] Optionally, the gypsum powder is obtained by grinding raw gypsum to a fineness of less than 0.01 mm.

[0007] Optionally, the attapulgite soil is passed through a 1000-mesh sieve.

[0008] Optionally, the sugar is raw sugar.

[0009] Secondly, this application also provides a method for preparing the above-mentioned coagulant, comprising the following steps:

[0010] S1. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder;

[0011] S2. Add the attapulgite clay to the sugar and heat and stir until homogeneous to obtain a mixture;

[0012] S3. Add the mixture prepared in S2 to the gypsum powder prepared in S1, grind and stir; then dry to obtain the coagulant.

[0013] Optionally, in step S2, the temperature is raised to 60–80°C.

[0014] Optionally, in step S3, the drying temperature is 80–100°C.

[0015] In summary, this invention, by adding attapulgite and sugar, allows the sugar to promote rapid crystal growth, thereby reducing the initial setting time. Utilizing the high adsorption capacity of attapulgite, its uniform distribution within the gypsum allows for more even sugar distribution. The attapulgite in the gypsum can adsorb calcium sulfate, accelerating crystal growth and reducing the final setting time. Simultaneously, the attapulgite allows for a tighter bond between the sugar and the gypsum, thus increasing the tensile load of the prepared gypsum board. Detailed Implementation

[0016] The present application will be further described in detail below with reference to the embodiments.

[0017] Unless otherwise specified, the main components involved in the following embodiments of this application are all purchased from commercially available products.

[0018] Raw gypsum: It is obtained by processing waste from sawing gypsum board edges, removing waste facing paper and overburned sawing edges;

[0019] Attapulgite clay: passed through a 1000-mesh sieve, purchased from Wuhan Chundu Biotechnology Co., Ltd.;

[0020] Sugar: Raw sugar was used and purchased from Qidong Hongcheng Chemical Co., Ltd. Specific Implementation

[0022] Example 1

[0023] This embodiment is used to prepare a coagulant. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 3 kg of attapulgite clay to 5 kg of sugar, heat to 60°C and stir evenly to obtain a mixture.

[0024] Add 8 kg of the mixture to 92 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0025] Example 2

[0026] This embodiment is used to prepare a coagulant. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 3 kg of attapulgite clay to 4 kg of sugar, heat to 60°C and stir evenly to obtain a mixture;

[0027] 7 kg of the mixture was added to 93 kg of gypsum powder and ground and stirred; then dried at 80°C (until the moisture content was below 0.1 wt%) to obtain the coagulant.

[0028] Example 3

[0029] This embodiment is used to prepare a coagulant. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 2 kg of attapulgite clay to 4 kg of sugar, heat to 60°C and stir evenly to obtain a mixture.

[0030] Add 6 kg of the mixture to 94 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0031] Example 4

[0032] This embodiment is used to prepare a coagulant. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 2 kg of attapulgite clay to 3 kg of sugar, heat to 60°C and stir evenly to obtain a mixture.

[0033] Add 5 kg of the mixture to 95 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0034] Example 5

[0035] This embodiment is used to prepare a coagulant. Grind raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 1 kg of attapulgite clay to 3 kg of sugar, heat to 60°C and stir evenly to obtain a mixture;

[0036] Add 4 kg of the mixture to 96 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0037] Comparative Example 1

[0038] This comparative example is used to prepare a coagulant. Raw gypsum is ground to a particle size of less than 0.01 mm to obtain gypsum powder; 3 kg of sugar is added to 96 kg of gypsum powder and ground and stirred; and dried at 80°C (until the moisture content is less than 0.1 wt%) to obtain the coagulant.

[0039] Comparative Example 2

[0040] This comparative example is used to prepare a coagulant. Raw gypsum is ground to a particle size of less than 0.01 mm to obtain gypsum powder; 5 kg of attapulgite clay is added to 3 kg of sugar and heated to 60°C and stirred evenly to obtain a mixture.

[0041] Add 8 kg of the mixture to 96 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0042] Comparative Example 3

[0043] This comparative example is used to prepare a coagulant. Raw gypsum is ground to a particle size of less than 0.01 mm to obtain gypsum powder; 1 kg of attapulgite clay is added to 1 kg of sugar and heated to 60°C and stirred evenly to obtain a mixture.

[0044] Add 2 kg of the mixture to 96 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0045] The component ratios of Examples 1 to 5 and Comparative Examples 1 to 3 are shown in Table 1.

[0046] Table 1

[0047] Example 1 92 3 5 1.67 Example 2 93 3 4 1.33 Example 3 94 2 4 2 Example 4 95 2 3 1.5 Example 5 96 1 3 3 Comparative Example 1 96 0 3 / Comparative Example 2 96 5 3 0.6 Comparative Example 3 96 1 1 1

[0048] The initial setting time and final setting time of the slurry for the prepared paper-faced gypsum board were determined according to GB / T 17669.4-1999; the breaking load of the gypsum board was determined according to GB / T 9775-2008. The test results are shown in Table 2.

[0049] Table 2

[0050] Example 1 0.8 0.25wt% 22 186 208 Example 2 0.8 0.25wt% 30 205 196 Example 3 0.8 0.25wt% 23 198 203 Example 4 0.8 0.25wt% 25 192 205 Example 5 0.8 0.25wt% 32 215 193 Comparative Example 1 0.8 0.25wt% 35 258 182 Comparative Example 2 0.8 0.25wt% 45 289 171 Comparative Example 3 0.8 0.25wt% 42 246 187

[0051] As can be seen from Examples 1-5, Comparative Examples 1-3, Table 1 and Table 2, the paper-faced gypsum board prepared by adding the accelerator prepared by the technical solution of this application has a shorter initial and final setting time, with the initial setting time being less than 32s and the final setting time being less than 215s; and the breaking load is much higher than the requirement of not less than 180N for gypsum board used for partition walls.

[0052] Based on Example 2, the inventors made the following Examples 6 to 11.

[0053] Example 6

[0054] This embodiment is used to prepare a coagulant. Grind raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 2 kg of attapulgite clay to 5 kg of sugar, heat to 60°C and stir evenly to obtain a mixture;

[0055] 7 kg of the mixture was added to 94 kg of gypsum powder and ground and stirred; then dried at 80°C (until the moisture content was below 0.1 wt%) to obtain the coagulant.

[0056] Example 7

[0057] This embodiment is used to prepare a coagulant. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 2 kg of attapulgite clay to 4.5 kg of sugar, heat to 60°C and stir evenly to obtain a mixture.

[0058] Add 6.5 kg of the mixture to 94 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0059] Example 8

[0060] This embodiment is used to prepare a coagulant. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 2 kg of attapulgite clay to 3.5 kg of sugar, heat to 60°C and stir evenly to obtain a mixture;

[0061] Add 5.5 kg of the mixture to 94 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0062] Example 9

[0063] This embodiment is used to prepare a coagulant. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 2 kg of attapulgite clay to 3 kg of sugar, heat to 60°C and stir evenly to obtain a mixture.

[0064] Add 5 kg of the mixture to 94 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0065] Example 10

[0066] This embodiment is used to prepare a coagulant. Grind raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 2 kg of attapulgite clay to 2.5 kg of sugar, heat to 60°C and stir evenly to obtain a mixture;

[0067] Add 4.5 kg of the mixture to 94 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0068] Example 11

[0069] This embodiment is used to prepare a coagulant. Grind raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; add 2 kg of attapulgite clay to 2 kg of sugar, heat to 60°C and stir evenly to obtain a mixture;

[0070] Add 4 kg of the mixture to 94 kg of gypsum powder and grind and stir; dry at 80°C (until the moisture content is below 0.1 wt%) to obtain the coagulant.

[0071] The composition of Examples 3 and 6-11 above is shown in Table 3.

[0072] Table 3

[0073]

[0074]

[0075] The initial setting time and final setting time of the slurry for the paper-faced gypsum boards prepared in Examples 6 to 11 were determined according to GB / T 17669.4-1999; the breaking load of the gypsum boards was determined according to GB / T 9775-2008. The test results are shown in Table 4.

[0076] Table 4

[0077] Example 6 0.8 0.25wt% 26 212 189 Example 7 0.8 0.25wt% 25 206 195 Example 3 0.8 0.25wt% 23 198 203 Example 8 0.8 0.25wt% 22 195 204 Example 9 0.8 0.25wt% 24 199 205 Example 10 0.8 0.25wt% 27 204 202 Example 11 0.8 0.25wt% 29 208 199

[0078] As can be seen from Examples 6-11, Table 3 and Table 4, when the weight ratio of sugar to attapulgite in the accelerator prepared by the technical solution of this application is (1.5-2):1, the prepared paper-faced gypsum board has a shorter initial and final setting time, with the initial setting time being less than 25s and the final setting time being less than 200s; and the breaking load is much higher than the requirement of not less than 180N for gypsum board used for partition walls, reaching more than 200N.

[0079] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A accelerator for paper-faced gypsum board, characterized in that, It is made from the following components in parts by weight: 92-96 parts gypsum powder, 1-3 parts attapulgite clay, and 3-5 parts sugar; The weight ratio of attapulgite clay to sugar is 1:(1.5-2); The gypsum powder is obtained by grinding raw gypsum to a fineness of less than 0.01 mm; The attapulgite soil was passed through a 1000-mesh sieve. The sugar mentioned is raw sugar.

2. A method for preparing the coagulant according to claim 1, characterized in that, Includes the following steps: S1. Grind the raw gypsum to a particle size of less than 0.01 mm to obtain gypsum powder; S2. Add the attapulgite clay to the sugar and heat and stir until homogeneous to obtain a mixture; S3. Add the mixture prepared in S2 to the gypsum powder prepared in S1, grind and stir; then dry to obtain the coagulant.

3. The coagulant according to claim 2, characterized in that, In step S2, the temperature is heated to 60–80°C.

4. The coagulant according to claim 2, characterized in that, In step S3, the drying temperature is 80–100°C.

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