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Cement reinforced gypsum board

A technology of gypsum board and paper-faced gypsum board, applied in construction, building structure, covering/lining, etc., can solve the problems of easy deformation and unsatisfactory effect, so as to improve strength, avoid flexural strength and improve surface hardness Effect

Inactive Publication Date: 2016-07-27
BEIJING NEW BUILDING MATERIALS PLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At this stage, the moisture deflection of gypsum board is mainly controlled by boric acid and tartaric acid in the gypsum board components, but the effect is not very satisfactory. The moisture deflection is between 3-6mm, and it is easy to deform when it is wet

Method used

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  • Cement reinforced gypsum board
  • Cement reinforced gypsum board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The results of recent tests on the moisture deflection of cement gypsum boards are shown in Table 1 (the conventional dosage of starch is 25g / m 2 ; The amount of starch in the gypsum board after adding cement is 33g / m 2 ; the water paste ratio is 70% and 73% respectively; the drying temperature is respectively 130°C at the outlet of the first zone and 90°C at the outlet of the second zone; 135°C at the outlet of the first zone and 88°C at the outlet of the second zone):

[0025]

[0026] Experimental conditions: 32°C, 90% humidity, constant temperature and humidity for 48 hours, gypsum boards placed horizontally. The tested gypsum boards were all experimentally produced in the production line. The only variable in each group was the amount of cement added, and the other added amounts remained unchanged. The main line speed was 48m / min (the same below).

Embodiment 2

[0028] The test results of the moisture deflection performance of 9.5mm thick gypsum boards with different cement additions are shown in Table 2: (The conventional dosage of starch is 25g / m 2 ; The amount of starch in the gypsum board after adding cement is 33g / m 2 ; the water paste ratio is 70% and 73% respectively; the drying temperature is respectively 130°C at the outlet of the first zone and 90°C at the outlet of the second zone; 135°C at the outlet of the first zone and 88°C at the outlet of the second zone):

[0029]

[0030]

[0031] Experimental conditions: 32°C, 90% humidity, constant temperature and humidity for 48 hours, gypsum boards placed horizontally.

Embodiment 3

[0033] The test results of the moisture deflection performance of 12mm thick gypsum boards with different cement additions are shown in Table 3: (The conventional dosage of starch is 25g / m 2 ; The amount of starch in the gypsum board after adding cement is 33g / m 2 ; The water paste ratio is 70% and 73% respectively; the drying temperature is respectively 130°C at the outlet of the first zone, 90°C at the outlet of the second zone, 135°C at the outlet of the first zone, and 88°C at the outlet of the second zone):

[0034]

[0035] Experimental conditions: 32°C, 90% humidity, constant temperature and humidity for 48 hours, gypsum boards placed horizontally.

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Abstract

The invention relates to a gypsum plaster board capable of lowering the damp deflection and effectively preventing deformation after the board is affected with damp. The gypsum plaster board comprises a gypsum board core and a surface protecting material, wherein cement is added into the gypsum board core, and the adding mass of the cement is 2%-5% of the mass of plaster of paris. Compared with an existing gypsum plaster board, the cement of the proper proportion is added into the gypsum plaster board, and therefore the damp deflection of the produced gypsum board is within 0-2mm, the bonding level can reach level II or higher, and the problem that the gypsum board is prone to deformation after being affected with damp is well solved. Stacking and transportation of the gypsum plaster board are greatly facilitated, the situation that the board surface is damaged or deformed due to the fact that the bending strength and the impact strength of the board surface are greatly lowered after the board is affected with damp is also avoided, the surface hardness of the gypsum plaster board is improved, and therefore the strength of the board is improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a cement-reinforced gypsum board. Background technique [0002] Paper-faced gypsum board has the advantages of light weight, sound insulation, heat insulation, strong processing performance, and simple construction methods. It is widely used in industrial and civil buildings, especially as indoor and outdoor decoration materials, such as ceilings, partition walls, etc. Material. The structure of the paper-faced gypsum board for interior decoration is: an intermediate matrix layer made of gypsum gelling material, and a protective surface layer composed of tough paper is arranged outside the intermediate matrix layer. [0003] The main raw material for the production of plasterboard is gypsum. The flexural strength and impact strength of the paper-faced gypsum board mainly depend on the strength of the protective layer made of tough paper and the deflection of the gyps...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04F13/14C04B28/14
CPCE04F13/14C04B28/14C04B7/02C04B24/38C04B22/08C04B24/04
Inventor 徐涛徐伟刘一成李明明
Owner BEIJING NEW BUILDING MATERIALS PLC
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