Gypsum board

A gypsum board and gypsum technology, applied in the field of gypsum board, can solve the problems of high pH, ​​low compressive strength of gypsum board strength, long time-consuming slurry hardening, etc., and achieve the effect of preventing bending

Inactive Publication Date: 2012-10-03
CHIYODA UTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this conventional example, the strength of the obtained gypsum board, such as low compressive strength, takes a long time to harden the slurry, and has problems that the pH is remarkably high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 8～14 and comparative example 13～15

[0044] Except for using 500 g of ordinary Portland cement mixed with calcined gypsum in an amount described in Table 1 instead of 500 g of calcined gypsum, it was carried out in the same manner as in Comparative Example 12. After preparing a slurry and obtaining a gypsum board, Determine the compressive strength. The results are shown in Table 2 and figure 1 .

[0045] Table 2

[0046]

[0047] Table 2,

[0048] Addition amount: add the mass parts of ordinary Portland cement per 100 mass parts of calcined gypsum

[0049] From Table 2 and figure 1 The results of the results can also be clear, although per 100 parts by mass of calcined gypsum adding the mass parts of ordinary portland cement in the range of 0.20 ~ 5.0, compared with the case without adding ordinary portland cement (comparative example 12), the compressive strength At about the same level or more, but when the mass parts of ordinary portland cement are added more than this, for example, when it is 10.0 or...

Embodiment 15 and comparative example 17～19

[0054] Except for using calcined gypsum mixed with ordinary Portland cement in an amount described in Table 1 instead of calcined gypsum, the same procedure was carried out as in Comparative Example 16 to prepare a slurry and measure the hardening when the hardened body was obtained. Time (minutes to end) vs. pH. The results are summarized in Table 3.

[0055] table 3

[0056]

[0057] Table 3,

[0058] Addition amount: add the mass parts of ordinary Portland cement per 100 mass parts of calcined gypsum

[0059] It is also clear from the results in Table 3 that when the mass parts of ordinary Portland cement added per 100 mass parts of calcined gypsum is increased to 20-30, compared with the case of not adding ordinary Portland cement (Comparative Example 16), , the hardening time becomes longer, and the pH becomes significantly higher.

[0060] Test Category 4

Embodiment 16

[0066] In the same manner as in Comparative Example 27, except that ordinary Portland cement was mixed in the amount described in Table 4 instead of calcined gypsum, after the slurry was prepared to obtain a gypsum board, a test piece was cut out and measured. Bend after 48 hours. The results are summarized in Table 4 and figure 2 .

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Abstract

Provided is a gypsum board which can sufficiently suppress bending, even when produced using a starting gypsum material that contains a large amount of water-soluble salts as impurities. Further, the gypsum board is unproblematic in compressive strength, hardening time, pH, and so on. A gypsum board produced by filling a gypsum-containing slurry into a frame mold and hardening the slurry, wherein the slurry contains both calcined gypsum and 0.2 to 5.0 parts by mass of a cement per 100 parts by mass of the calcined gypsum.

Description

technical field [0001] The present invention relates to a gypsum board, and more specifically, to a gypsum board capable of sufficiently preventing warping even when gypsum containing a high content of water-soluble salts corresponding to impurities is used in preparation of a slurry to be cured. Background technique [0002] In the past, it is common to fill the slurry containing gypsum between the base paper on the lower side of the formwork and the base paper on the upper side, and convey it continuously in this state, while hardening the slurry and hardening the body during the process. cutting to make plasterboard. Slurry containing gypsum is prepared by mixing calcined gypsum (hemihydrate gypsum) obtained by calcining raw gypsum with various mixed materials or pharmaceuticals and required amounts of water. As raw material gypsum, various Chemical gypsum, such as phosphate gypsum, flue gas desulfurization gypsum, titanium gypsum (by-product gypsum in the manufacture of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B2111/0062C04B28/14
Inventor 藤田巧本多秀隆堤康祐
Owner CHIYODA UTE
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