Restriction of outgassing from concrete and member therefor

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a method for suppressing the outgas generated from concrete from being released into a room, and a member for that purpose.

【0002】

[Conventional technology]

In recent years, it has become clear that outgas generated from concrete forming the frame and interior materials of museums and the like accelerates the deterioration of paintings and works of art, and in particular, ammonia gas generated from concrete causes yellowing of oil paintings. Is regarded as a problem. For this reason, countermeasures are required, and it is said that it is necessary to suppress the ammonia concentration in the room to several tens of ppb or less in museums and the like.

【0003】

The amount of ammonia gas generated from concrete gradually decreases with the passage of time, but it usually takes a long period of 6 months to 1 year before the ammonia concentration in the room can be maintained below the above allowable limit. It is something that will be done. The period can be shortened to some extent by forcibly drying the concrete by raising the temperature, but in any case, it is not realistic to refrain from using the building for such a long period of time, so ammonia gas is used. Measures to positively suppress it are indispensable. For example, by attaching a sheet containing an adsorbent such as activated carbon to the concrete surface, ammonia gas generated from the concrete is adsorbed and released as it is into the room. Measures such as prevention are being considered.

【0004】

[Problems to be Solved by the Invention]

However, with the above-mentioned adsorbent, once the adsorbent is saturated, further adsorption cannot be performed, and after that, the sheet permeates as it is and ammonia gas is released into the room. .. Moreover, since a wide variety of gases generated from adhesives and paints generally exist inside the building during construction or immediately after completion, those gases are adsorbed by the adsorbent before the ammonia gas is adsorbed. It is conceivable that it will be saturated early, and it is assumed that sufficient effects cannot be expected. Therefore, it has been urgently needed to develop an effective means for sufficiently suppressing outgas such as ammonia gas.

【0005】

[Means for solving problems]

In view of the above circumstances, the outgas suppression method of the present invention is such that a suppression member containing an adsorbent that adsorbs outgas and a photocatalyst that decomposes the outgas is applied or attached so as to cover the concrete surface.

【0006】

Further, the outgas suppressing member of the present invention is applied to the above method, and contains an adsorbent for adsorbing outgas and a photocatalyst for decomposing the outgas, and is applied or attached so as to cover the concrete surface to outgas. It is configured to adsorb and decompose. In the outgas suppression member of the present invention, it is conceivable to support the photocatalyst on an adsorbent or use the photocatalyst as microcapsules. When the photocatalyst is a microcapsule, it is preferable to use the photocatalyst particles as mother particles and attach the fine particles of the adsorbent to the surface thereof to form a capsule wall material. Further, in any case, it is preferable that the photocatalyst is laminated on the surface of the sheet-shaped base material.

【0007】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the suppression method and the embodiment of the suppression member according to the present invention will be described with reference to FIG. In this embodiment, the outgas suppressing member 2 is installed so as to cover the surface of the concrete 1, and the outgas generated from the concrete 1, especially ammonia gas, is adsorbed and decomposed by the suppressing member 2, so that the ammonia gas is released into the room as it is. It is designed to prevent the concrete from being used.

【0008】

The suppressing member 2 of the present embodiment has an adsorbent 3 that adsorbs ammonia gas and a photocatalyst 4 that decomposes ammonia gas, and is formed of a sheet-shaped non-woven fabric or resin as a base material 5.

【0009】

As the adsorbent 3, for example, zeolite, activated carbon, silica and the like can be preferably adopted. The photocatalyst 4 has a function of decomposing ammonia gas by a photoreaction, and specifically, for example, anatase-type titanium dioxide can be preferably adopted. In the suppressing member 2 of the present embodiment, the photocatalyst 4 is supported on the adsorbent 3 as a carrier and dispersed inside the base material 5, and the photocatalyst 4 is laminated alone on the surface of the base material 5. It is configured.

【0010】

If the photocatalyst 4 is used in the form of minute microcapsules, it is possible to prevent the base material 5 itself from being decomposed or deteriorated by the photocatalyst 4, which is more preferable. A known interfacial reaction method can be adopted for microencapsulating the photocatalyst 4, and as the capsule wall material, for example, a thin film having translucency such as silica or calcium silicate and having porous and breathable properties should be adopted. Just do it.

【0011】

By attaching the suppressing member 2 having the above configuration so as to cover the surface of the concrete 1 as described above, outgas such as ammonia gas generated from the concrete 1 is adsorbed by the adsorbent 3, and the adsorbed ammonia gas is absorbed by the photocatalyst 4. It will be disassembled. Therefore, the adsorbent 4 is not saturated, and the adsorbing function of the adsorbent 4 can be maintained for a long period of time. Further, the unadsorbed ammonia gas and the ammonia gas separated from the adsorbent 3 are decomposed by the photocatalyst 4 laminated on the surface of the base material 5 and are not released as they are into the room. Moreover, since the photocatalyst 4 laminated on the surface of the base material 5 can sufficiently receive the ultraviolet rays required for the photoreaction, excellent decomposition efficiency can be obtained.

【0012】

Furthermore, the photocatalyst 4 has a decomposing action not only on outgas such as ammonia gas but also on various harmful substances, and also has antibacterial and antifouling properties, so that the surface of the base material 5 can always be kept clean. Therefore, the present invention is suitable not only for museums but also for buildings for various purposes such as clean rooms where cleanliness is required.

【0013】

Although the restraining member 2 of the above embodiment is attached to the concrete surface using the sheet-shaped base material 5, the adsorbent 3 carrying or adding the photocatalyst 4 is not limited to the sheet-like shape. It may be applied directly to the surface of concrete 1 to form a coating film.

【0014】

2 and 3 show other embodiments of the restraining member of the present invention. In this embodiment, the photocatalyst 4 is microencapsulated using an adsorbent 3 such as zeolite as a capsule wall material. In this case, as a preparation method for microencapsulation, a high-speed airflow in which several types of powder particles are stirred and mixed in a high-speed airflow to attach fine particles to the surface of relatively large mother particles as a capsule wall material. By adopting the impact method, as shown in FIG. 3, the particles of the photocatalyst 4 can be used as the mother particles, and the fine particles of the adsorbent 3 such as zeolite can be attached to the surface as the capsule wall material. If the photocatalyst 4 microencapsulated in this way is dispersed in the base material 5 in the same manner as in the above embodiment as shown in FIG. 2, outgas such as ammonia gas adsorbed on the adsorbent 3 which is the capsule wall material is released. It is efficiently decomposed by the photocatalyst 4 which is the mother particle. In FIG. 2, the photocatalyst 4 is laminated alone on the surface of the base material 5 as in the above embodiment, but the photocatalyst 4 may also be microencapsulated in the same manner.

【0015】

[Effect of the invention]

In the outgas suppression method of the present invention, not only an adsorbent that adsorbs outgas such as ammonia gas generated from concrete but also an adsorbent that has a photocatalyst that decomposes the adsorbent covers the concrete surface, so that the adsorbent can be used at an early stage. It is possible to prevent saturation and maintain its adsorptive action for a long period of time.

【0016】

Further, the suppressing member of the present invention not only adsorbs outgas such as ammonia gas by an adsorbent, but also decomposes the adsorbed outgas by a photocatalyst, and can decompose the unadsorbed outgas by a photocatalyst. The release of the gas can be suppressed for a long period of time and an excellent suppressing effect can be obtained, which is optimal for application to the above method. In particular, if the photocatalyst is supported on the adsorbent, the outgas adsorbed by the adsorbent can be rapidly decomposed by the photocatalyst. Further, if the photocatalyst is microencapsulated, it is possible to prevent the base material and the like from being deteriorated by the photocatalyst. In that case, if the photocatalyst is used as the mother particle and the adsorbent is used as the capsule wall material, the capsule wall is used. The outgas adsorbed by the adsorbent, which is a material, can be efficiently decomposed by the photocatalyst which is the mother particle. Furthermore, if a photocatalyst is laminated on the surface of a sheet-like base material, it is easy to handle and can be easily attached to concrete, and at the same time, it naturally receives the light required for the photocatalyst to react. Since it is obtained, a more excellent suppressing effect can be obtained.

[Simple explanation of drawings]

[Figure 1]

It is a figure which shows typically the mode of the restraint method and the restraint member which concerns on this invention.

[Figure 2]

It is a figure which shows typically the suppression method and other embodiment of the suppression member which concerns on this invention.

[Fig. 3]

It is a figure which shows typically the microencapsulated photocatalyst in the same embodiment.

[Explanation of symbols]

1 concrete 2 Outgas suppression member 3 Adsorbent 4 Photocatalyst 5 Base material