JPS62129435A - Waterproof gypsum board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field 1] The present invention relates to a waterproof gypsum board with stable water permeability and moisture permeability.

[Background technology 1 Up-grade gypsum board has conventionally been used alone as wall material, etc., but commercially available gypsum board 1 has poor waterproof performance and causes dew condensation on the indoor side.
As shown in the figure, a waterproof material 8 such as asphalt roofing is pasted between the exterior material 7 to supplement the waterproof performance of the gypsum board 1, but the construction is time-consuming and expensive. It was put away.

[Objective of the Invention 1 The present invention has been made in view of the above circumstances, and its purpose is to improve water permeability and moisture permeability against external water such as rainwater and moisture when used as a wall material. Our objective is to provide a waterproof gypsum board that is stable and has excellent waterproof performance.

[Disclosure 1 of the Invention The waterproof gypsum board of the present invention is made by applying a waterproofing agent 3 to the board base paper 2 of the gypsum board 1, and with this structure, the above object can be achieved. That is, since the waterproofing agent 3 is applied to the board base paper 2, the waterproofing performance of the gypsum board 1 can be improved, and therefore, during construction,
There is no need to attach waterproofing materials such as asphalt roofing as in the past, and the construction is excellent.

Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. The gypsum board 1 is made by adding an appropriate amount of water to gypsum, an admixture material, etc., and kneading the mixture thoroughly as a core, and covering both sides and sides with a base paper 2 for board. Base paper for this board 2
has a Steckicht size rating of 320 or higher (J
IS P8122 compliant), water absorption is 15+? / m2
/40 g/m2 or less (JIS P8140) is preferable. This board base paper 2 is coated with a waterproofing agent 3. The waterproofing agent 3 is, for example, an acrylic resin in an emulsion state. This waterproofing agent 3 is applied to the board base paper 2 before the gypsum board 1 is completed. That is, as shown in FIG. 3, the board base paper 2 is manufactured by passing through a pressing section 4, passing through a drying section 5, and being given gloss by a Karen Goo 6 after papermaking. Immediately after passing through, the waterproofing agent 3 is applied by spray 9. of course,
It may be applied to the board base paper 2 after the gypsum board 1 is completed, but in this case, the manufacturing cost will approximately double. Since the waterproofing agent 3 is applied to the board base paper 2 in this manner, waterproof performance can be ensured even at the corner portions of the obtained waterproof gypsum board. The cut ends do not need to be covered with the base paper 2 for board. Using this waterproof gypsum board A, as shown in FIG. 2, an exterior material 7 is attached as a wall base material to form a wall or the like. In order to evaluate the waterproof performance of the present invention, for example, a coating amount of 46 ml of waterproofing agent 3 was applied to board base paper 2.
g/In'' and dried at room temperature, and measured the water permeability and moisture permeability of a waterproof gypsum board (Example) manufactured using this base paper for board 2, and compared to a commercially available gypsum board (Comparative Example 1). A comparison was made with this gypsum board with asphalt roofing (17 kg product based on IIS 86 to 06) attached (Comparative Example 3).

The dimensions were 3 m in width, 6 Ifl in length, and 91III11 in thickness. The results are shown in Table 1.

Table 1 Water permeability Moisture permeability (IfiCm2・7 days Example 47.0 658.3 Comparative example 1 1980.6 66.3 The water permeability and moisture permeability of the examples of the present invention are comparable to Comparative example 2. It can be seen that it exhibits

[Effect of the invention 1] In the present invention, since a waterproofing agent is applied to the base paper for gypsum board, the waterproofing agent can stabilize the water permeability and moisture permeability and improve the waterproof performance of the gypsum board. Therefore, during construction, there is no need to attach a waterproof material such as asphalt roofing as in the past, and the workability is excellent.

[Brief explanation of drawings]

:jS1 is a perspective view showing one embodiment of the present invention, FIG. 2 is an exploded cross-sectional view showing an example of the construction of the same as above, Fig. 4 is an exploded sectional view showing a conventional construction example, where A is a waterproof stone/body board, 1 is a gypsum board, 2 is a base paper for the board, and 3 is a waterproofing agent. Agent: Patent Attorney G Bl Figure 1 Figure 2 Figure 4

Claims (2)

[Claims] (1) A waterproof gypsum board characterized by being made by coating base paper for gypsum board with a waterproofing agent. (2) The waterproof gypsum board according to claim 1, wherein the waterproofing agent is an acrylic resin emulsion.