JP4692989B2 - Method of suppressing divergence of VOC at construction site - Google Patents

Description

The present invention relates to a VOC method divergence inhibition in VOC (volatile organic compounds Volatile Organic Compounds,) take measures to the construction site which occurs during architectural construction.

  Conventionally, many harmful VOCs (acetaldehyde, toluene, trichloroethylene, tetrachloroethylene, formaldehyde, benzene, xylene, etc.) are volatilized in construction sites such as new constructions such as office buildings and condominiums, and renovations of outer walls. Building materials such as paints, adhesives, waterproofing materials, and the like containing a conductive organic compound) are used, and there is a problem that VOCs diverge from the building materials into the surrounding environment. In particular, VOC pollution generated from building materials due to high air-tightness of the indoor environment has been regarded as a social problem by affecting the health of residents such as sick house syndrome.

However, as a measure for preventing VOC as described above, it is desirable to use a low-content VOC building material, but it is necessary to use a solvent-based chemical containing VOC for securing physical properties such as workability and building material strength. Yes. Further, in general, there is no measure for treating VOCs that are volatilized and diffused from paints, adhesives, and the like.
On the other hand, at construction sites such as new construction work and renovation work such as outer walls, the surroundings of the building frame or building are covered with a construction work sheet to suppress the diffusion of dust generated in the work to the surroundings (for example, Patent Document 1, Patent Document 2).
JP 2000-303699 A JP-A-2004-162497

The present invention, which has been devised in view of the construction work for the seat that has been conventionally used, the present invention is, of VOC in the construction site Ru can reduce the effects of VOC that occur during building construction An object is to provide a method for suppressing divergence.

Order to achieve the above object, VOC method divergence suppression in the construction site of the present invention, a film-like sheet body made possible with the transparent polymer passage of ultraviolet light, the coating on only one side of the seat body A construction work sheet having a VOC processing functional film containing a photocatalyst formed is provided, and the building housing or the periphery of the building is covered with the construction work sheet at the construction site with the one surface facing the building housing or the building. The VOC generated at the construction site is processed by the VOC processing function film to suppress the divergence of the VOC to the surrounding environment.

Conventionally, at the construction site, the building frame or the periphery of the building is covered with a construction work sheet, and construction work such as new construction work or repair work is performed.
Therefore, when the construction sheet of the present invention is used for this construction sheet, the VOC treatment functional film containing the photocatalyst is coated on one surface of the building body or the sheet main body facing the building. The volatile organic compound (VOC) generated in the catalyst can be treated with a photocatalyst contained in the VOC treatment functional film.
That is, no special process such as covering the building frame or the surrounding area with a VOC processing sheet is required, and VOC processing can be easily performed by the same construction process as before, thereby reducing the adverse effects of VOC.

In the embodiment of the present invention, a photocatalyst (for example, titanium dioxide) is used for a construction sheet used for the purpose of, for example, paint used in construction work, dust generated by the construction work, prevention of water scattering, and ensuring aesthetics during construction work. By providing a VOC processing functional film containing fine particles, harmful VOCs generated from paints, adhesives and the like are processed.
Specifically, a film-like sheet body or a mesh-like sheet body is provided, and this is coated with a VOC processing functional film containing a photocatalyst.
In this case, by providing a mesh-like sheet body through which light and VOC pass, VOC processing can be performed on both sides of the sheet body.
In addition, if this construction sheet is constructed by fixing the photocatalyst to a transparent polymer (tetrafluoroethylene, etc.) that passes sunlight (ultraviolet rays) necessary for the activation of the photocatalyst, it will be used for construction work that faces buildings and building structures. VOC processing can be performed on the inner surface of the sheet.
Moreover, you may make it comprise a VOC processing functional film | membrane by adhering to the sheet | seat main body the mixture which mixed the compound which has VOC adsorption | suction effects, such as apatite, diatomaceous earth, and shellac resin, and a photocatalyst.

Hereinafter, specific examples of the present invention will be described.
FIG. 1 is a partial sectional view showing a construction work sheet 2 according to a first embodiment of the present invention.
In the construction work sheet 2 of this embodiment, for example, a VOC processing functional film 20 containing a photocatalyst is provided on both surfaces of a non-transparent, non-breathable sheet body 10.
As the photocatalyst, for example, metal compounds such as titanium dioxide fine particles and zinc oxide are used, and titanium dioxide fine particles are used in this embodiment.
The sheet body 10 is a construction sheet 2 which is a conventional commercial product called a building curing sheet or a blue sheet.
This type of sheet is generally composed of a polymer such as vinyl chloride or polypropylene as the main component and has a length of m (for example, about 1.8 to 5 m) x a width of m (for example, about 1.8 to 5 m) and a thickness. A rectangular sheet of about 0.1 to 1 mm is used, and this is used as a sheet body.
As a commercial product of the construction work sheet 2, for example, a trade name “flameproof sheet (curing sheet for building work)” manufactured by Meiji Shoko Co., Ltd. or a trade name “Blue Sheet” manufactured by Ebara Industries Co., Ltd. can be used. . Note that the “flameproof sheet (curing sheet for building construction)” has a thickness of 0.3 mm, and the “blue sheet” has a thickness of 0.26 mm.

Further, the VOC processing functional film 20 is a film in which a photocatalyst is contained in a coating material, and this coating material is coated on the surface of the sheet body 10 or sprayed.
Here, as the coating material, (1) alcohol-based solvent and aqueous solution containing photocatalyst particles and inorganic silica binder (silica), (2) inorganic compound (for example, apatite) or organic compound (for example, shellac resin) A solvent and an aqueous solution such as an alcohol containing a mixture of a compound having a VOC adsorption action and a photocatalyst (titanium dioxide) are used.
In addition, since the photocatalyst is activated by ultraviolet rays (wavelength of about 390 nm) close to the visible light region, a material that passes ultraviolet rays (for example, tetrafluoroethylene) is used as a constituent material of the VOC processing functional film 20, thereby building or building VOC processing can be performed on the inner surface of the construction work sheet 2 facing the housing or on both the inner surface and the outer surface.
In this embodiment, the VOC processing function film 20 is provided on both surfaces of the sheet body 10, but the VOC processing function film 20 may be provided only on one side. Further, the sheet body 10 is not limited to a non-transparent and non-breathable one, and can be appropriately changed as necessary.

FIG. 2 is a partial sectional view showing a construction work sheet 2 according to a second embodiment of the present invention.
The construction work sheet 2 of this embodiment is obtained by fixing a VOC treatment functional film 40 containing a photocatalyst (for example, titanium dioxide fine particles) to the fibers of a mesh-like sheet main body 30 made of a fiber material.
The sheet body 30 uses a fiber material made of a polymer or the like, and as a commercial product, for example, a trade name “Soft Mesh a” manufactured by Meiji Shoko Co., Ltd. can be used.
The “soft mesh a” has a 1 mm mesh size and is made of polypropylene.
The VOC treatment functional film 40 is made to adhere to the sheet body 30 with a mixture of a compound having a VOC adsorption action such as apatite, diatomaceous earth, shellac resin and a photocatalyst using various solvents (for example, an aqueous solution).
In the second embodiment, a mesh-like sheet body 30 through which light and VOC pass is used, and since there are a large number of gaps S penetrating the sheet body 30 in the thickness direction, VOC processing is performed on both surfaces of the sheet body 30. Is possible.
Also in the present embodiment, by using a material that passes ultraviolet rays (for example, tetrafluoroethylene) as a constituent material of the sheet body 30, VOC treatment can be performed on the inner surface of the construction work sheet 2 facing the building or the building frame. It becomes possible.

Next, modifications of the first and second embodiments will be described.
3 is a partial sectional view showing a construction work sheet 2 according to a modification of the first embodiment, and FIG. 4 is a partial sectional view showing a construction work sheet 2 according to a modification of the second embodiment.
3 and 4, the sheet body 10 (30) is protected between the sheet body 10 (30) and the VOC processing function film 20 (40), and the sheet of the VOC processing function film 20 (40) is provided. The undercoat layer 50 which improves the adhesiveness to the main body 10 (30) is provided.
Examples of such an undercoat layer 50 include those containing polysilica or a silica-modified acrylic resin in a solvent such as ethanol.

Next, a test for confirming the VOC treatment effect of the construction work sheet 2 actually created based on the first and second embodiments will be described.
(1) VOC (acetaldehyde) treatment test in a sealed container Here, a photocatalyst-coated and uncoated test specimen (curing sheet for building construction) according to this example is applied to a bag made of a transparent fluororesin film that transmits ultraviolet rays. ), Filled with air containing VOC, and irradiated with ultraviolet rays from a UV lamp to measure the concentration of VOC, thereby measuring the VOC processing capacity of the construction sheet 2 coated with the photocatalyst.

As the test body, a photocatalyst coating material applied to a commercially available curing sheet for building construction was used.
As the photocatalyst coating material, an aqueous solution containing several percent of photocatalyst particles (titanium dioxide having a particle diameter of 200 nm or less) in a binder containing a stable shellac resin or the like was used.
Moreover, the coating method used the method of spraying the photocatalyst coating material on the curing sheet for building construction. The coating amount of the photocatalyst coating material is 100 g / m ² .
As test conditions, the specimen size was 10 cm × 10 cm, the VOC-containing air container was 2 liters, and the ultraviolet intensity (center wavelength: 310 to 400 nm) was 0.5 mW / cm ² .
FIG. 5 is a table showing examples of test results.
As shown in the figure, it can be seen that the acetaldehyde concentration is lowered by the photocatalyst coating sheet and the photocatalyst coating mesh sheet to which the present embodiment is applied, and is appropriately processed.

(2) VOC (toluene) treatment simulation test using a curing sheet for building construction (construction sheet 2) Here, a space is simulated by a curing sheet for building work (width, depth, height each 1m) Fill toluene and measure the concentration of toluene inside and outside the building curing sheet. The measurement position is the center of the enclosed space inside the sheet, and the position outside the sheet is 20 cm outward from the sheet surface and the height is 50 cm. The measurement cycle is the average of 5 measurements every 10 minutes.
FIG. 6 is a table showing examples of test results.
As shown in the figure, it can be seen that the photocatalyst coating sheet and the photocatalyst coating mesh sheet to which the present embodiment is applied are reduced in the toluene concentration on both the inside and the outside of the sheet and properly treated.

It is a fragmentary sectional view which shows the sheet | seat 2 for construction work by the 1st Example of this invention. It is a fragmentary sectional view which shows the sheet | seat 2 for construction work by the 2nd Example of this invention. It is a fragmentary sectional view which shows the sheet | seat 2 for construction work by the modification of a 1st Example. It is a fragmentary sectional view which shows the sheet | seat 2 for construction work by the modification of a 2nd Example. It is a table | surface which shows the example of the test result of the sheet | seat 2 for construction works by the Example of this invention. It is a table | surface which shows the example of the test result of the sheet | seat 2 for construction works by the Example of this invention.

Explanation of symbols

  2 ... construction sheet 10, 30 ... sheet body, 20, 40 ... VOC treatment functional film, 50 ... undercoat layer.

Claims (4)

A sheet for construction work having a film-like sheet main body made of a transparent polymer capable of passing ultraviolet rays and a VOC treatment functional film containing a photocatalyst coated only on one surface of the sheet main body is provided.
Covering the surroundings of the building frame or building at the construction site with the construction sheet with the one side facing the building frame or building ,
The VOC generated at the construction site was processed with the VOC processing functional film, and the VOC was prevented from spreading to the surrounding environment.
A method for suppressing VOC divergence at a construction site. 2. The method for suppressing VOC divergence at a construction site according to claim 1, wherein the photocatalyst is titanium dioxide fine particles . 3. The VOC in a construction site according to claim 1, wherein the VOC treatment functional film is configured by adhering a mixture of a compound having a VOC adsorption action and the photocatalyst to the sheet body. How to suppress the divergence. 4. The method for suppressing VOC divergence at a construction site according to claim 3, wherein the compound having VOC adsorption action is apatite, diatomaceous earth, or shellac resin .

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