JPS595735B2 - fireproof insulation wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fireproof insulation wall in a safe, a fireproof library, a fireproof panel, or the like.

Traditionally, this type of fire-resistant insulated wall is made of a fire-resistant water-based hardener that hardens with the addition of water, such as cement or gypsum.
A fire-resistant additive such as asbestos, sand or lightweight aggregate is mixed and molded and hardened, or a fire-resistant additive and a foaming agent such as aluminum powder are added to the fire-resistant water-based curing agent and the material is foamed and hardened. things are used.

In this case, foaming with aluminum powder occurs when the aluminum powder is mixed with water, cement, etc., and the alkali content (Na20.
), which generates hydrogen gas through a chemical reaction with aluminum powder.The foamed insulation wall produced by foaming aluminum powder contains countless small bubbles (with a diameter of about IMN) inside. Compared to the former type of insulated wall, it is lighter and has significantly lower thermal conductivity (as a result, it has excellent heat insulation and fire resistance).

The reason why a water-based curing agent such as cement is used in the heat insulating wall is that in addition to its own heat insulating effect, the heat absorption effect due to the latent heat of vaporization of the water contained in the heat insulating wall improves the heat insulating effect.

However, the water contained within the heat insulating wall includes crystallized water that is chemically bonded during curing of the curing agent and free water that exists in a free state. Since free water is released into the atmosphere over time even at room temperature, the insulation effect of this insulating wall gradually decreases over time.

Therefore, in order for this type of insulation wall to exhibit a constant insulation effect even after years have passed, it is necessary to increase its thickness, or use lightweight aggregate or foaming agent, or lightweight aggregate and foaming agent. Although it is necessary to increase the mixing amount of both, the former method increases the weight, and the latter method has a problem in that it causes a decrease in the strength of the heat insulating wall.

The present invention improves the heat insulating effect by maintaining moisture within the heat insulating board in a state with almost no release, in a heat insulating board cured with a water-based curing agent like the two conventional heat insulating walls. It can be maintained for a long time, and in the event of a fire, moisture is released gradually, so the insulation effect can be maintained for a long time against a fire that lasts for a long time, and by combining this with a honeycomb board, it is lightweight. In Figures 1 and 2, reference numeral 1 denotes a heat insulating board 2 with a thickness of T1 and the back side of the insulating board 2 (which will not receive direct heat in the event of a fire, etc.) with a water-based curing agent. surface)
A heat insulating wall according to the present invention is shown in which a honeycomb board 3 with a thickness T2 is installed along the wall to make the thickness T, and the heat insulating board 2 is made of a fire-resistant water-based hardener such as cement or gypsum, 4 asbestos, sand or When a fire-resistant additive 5 such as lightweight aggregate or the fire-resistant additive and a foaming agent such as aluminum powder are mixed and cured by FC molding to a predetermined height T, silica gel, silica sol, or zeolite is added to this. Alternatively, the honeycomb board 3 is made of a water-absorbing agent 6 that releases a small amount of water at room temperature, such as activated alumina, mixed with an appropriate amount of water in a state in which it absorbs water. A metal plate 8 in which opposing surfaces 10 and 11 of a honeycomb body 70 made of a low-quality material are formed into reflective mirror surfaces by puff polishing or plating.
9 is stretched.

Here, silica gel or silica sol, which is the water absorbing agent 6, is 7.
It absorbs 0 to 80 wt% of water, and the relationship between the temperature of this water-absorbing silica gel and the water release rate (rate of water released into the atmosphere) is as shown in Figure 3. By mixing an appropriate amount of these water-absorbing agents into the heat insulating board 2 described above, the surface of the water-absorbing agent such as silica gel is covered with the aqueous curing agent.

The moisture contained in the heat insulating board 2 is composed of crystal water of the curing agent 4, moisture absorbed by the water absorbing agent such as silica gel, and free water other than the above, and the free water is reduced after being heated at room temperature. However, water absorbed by a water-absorbing agent such as silica gel whose surface is covered with a water-based curing agent exists in a stable state with almost no release into the atmosphere at room temperature, but at high temperatures (
Since it is gradually released from within the silica gel at the point when the water absorbing agent is released, it is possible to prevent the insulation effect from decreasing over time, maintain a certain level of insulation effect over a long period of time, and prevent water absorption from the water absorbing agent in the event of a fire, etc. Since the moisture is released gradually and the insulation effect is maintained over a long period of time, the insulation effect can be maintained against a fire for a long time.

In addition, by mixing the water-absorbing agent into the water-based curing agent in a state where it has absorbed water in advance, it becomes more compatible with the water-based curing agent (
Because it is strongly bonded, it is possible to avoid a decrease in the strength of the insulation wall due to the mixing of water absorbing agents.

In addition, zeolite has micropores of A unit in its structure,
The same effect can be obtained because water is confined within these micropores and the amount of moisture released into the atmosphere at room temperature is small. It goes without saying that other water absorbing agents such as activated alumina and molecular sieves may be used as long as they have less water absorption.

In this case, the heat insulating performance of the heat insulating board 2 can be adjusted as desired by increasing or decreasing the proportion of the water absorbent 6 mixed in, and the proportion of the inhalant mixed in is suitably 5 to 10 wt% in the case of dry silica gel.

On the other hand, in the honeycomb plate 3, since the honeycomb body 7 between the two metal plates 8°9 is made of a material with low thermal conductivity,
Heat transfer through the honeycomb body 7 is extremely small (and since the space of the honeycomb body 7 is small and sealed and there is almost no air convection, heat transfer by convection is also small; When the opposing surfaces 10 and 11 are formed as reflective mirror surfaces as shown in the embodiment diagrams, there is no heat transfer due to radiation, and the heat transfer between the two metal plates 8 and 9 is low. 8 and 9 have the effect of dispersing locally received heat over a wide range, so the heat insulation efficiency of this honeycomb plate 3 is even higher.

Note that metal foil may be used as the metal plates 8 and 9 (and the honeycomb plate 3 can be used on a surface that directly receives heat from a fire by constructing the honeycomb body 7 of a fire-resistant material such as asbestos). , can be provided on both sides of the heat insulating plate 20, and may be made of a multilayer honeycomb plate. Also, it does not cause fogging due to dirt, etc. (because it does not reduce its heat insulating effect).

Therefore, the heat insulating wall 1 of the present invention in which the insulation board 3 is installed along the heat insulating board 2 not only has a high heat insulating effect, but also does not suffer from a decrease in the heat insulating effect as time passes. Moreover, since the thickness of the heat insulating board can be reduced by 30 times the thickness of the honeycomb board, the weight of the entire heat insulating wall can be reduced, and the strength can be improved by using the honeycomb board.

Next, water, vermiculite, and aluminum powder were added to the Portland cement, and the mixture was cured while foaming to a thickness of 60 m/m.
As shown in Fig. 1, the insulation board 2 was made of the conventional product, and the same foamed concrete was used as the foamed concrete, and 1 ow of water-absorbing silicate-releasing material with a particle size of 1 to 2 m/m was added to the conventional product. % mixed in to a thickness of 50 m/m, and on the back side of this insulating wall, a honeycomb board 3 with a thickness of 10 m/m consisting of a metal plate 8゜9, an aluminum plate, and a honeycomb body paper is combined. In both cases, the surface of the foamed concrete was heated until no weight loss was observed after curing (in a state in which free water was almost completely removed), and then the surface of the foamed concrete was heated. The temperature and the temperature of the back surface that was not heated (the 9 metal plate surfaces of the honeycomb plate 3 in the product of the present invention) were measured at each time, and the results were as shown in the following table.

Based on this result, the relationship between the temperature on the back side and the heating time is shown in Figure 4. With conventional foam concrete insulation walls, the temperature rises quickly at the initial stage of heating (and the heating time is 90 minutes). The temperature on the back side showed a tendency to rise in proportion to time after the Moreover, the temperature rise at the initial stage of heating was slow, and the temperature on the back side remained at a substantially constant value regardless of the heating time, demonstrating excellent heat insulation performance.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a heat insulating wall according to an embodiment of the present invention, Fig. 2 is a partially cutaway right side view of Fig. 1, Fig. 3 is a diagram showing the relationship between the temperature of water-absorbing silica gel and the water discharge rate; Figure 4 is a diagram showing the relationship between 7JO heat time and surface temperature. 2...Pa insulation board, 3...Honeycomb board, 4
...Curing agent, 5...Additive, 6...
・・・Water absorbing agent, 7...]・Nicum body, 8,9・
...Metal plate, 10, 11... Opposite surfaces.

Claims (1)

[Claims] 1. A heat insulating board made by adding a fire-resistant additive to a fire-resistant water-based curing agent and curing it, or by adding a fire-resistant additive and a foaming agent to a fire-resistant water-based curing agent and curing it. In this method, a water-absorbing agent having a property of releasing a small amount of water at room temperature is mixed with the heat-insulating board before it hardens in a state where it absorbs water in advance, while a material with low thermal conductivity is added to the surface of the heat-insulating board. A fireproof and insulating wall characterized by a honeycomb board made of a honeycomb body with metal plates stretched on both sides. 2. The fireproof heat insulating wall according to claim 1, characterized in that silica gel or silica gel is used as the water absorbing agent. 3. In a heat insulating board formed by adding a fire-resistant additive to a fire-resistant water-based curing agent and curing it, or by adding a fire-resistant additive and a foaming agent to a fire-resistant water-based curing agent and curing it, the heat-insulating board is cured. Before curing, a water-absorbing agent that releases less water at room temperature is mixed with the water-absorbing agent in a pre-absorbed state, while a honeycomb body made of a material with low thermal conductivity is used on the surface of the gradual heating plate. 1. A fireproof and insulating wall characterized by having a honeycomb plate formed by stretching metal plates on both sides thereof, and forming opposite surfaces of the metal plates into reflective mirror surfaces. 4. A fireproof heat insulating wall according to the third claim, characterized in that silica gel or silica gel is used as a water absorbing agent.