JPS63289149A - Construction method for fungicidal repairing of surface of inorganic material - 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] <Industrial Application Field> The present invention is intended to exterminate mold on the surface of an inorganic agent in an already completed building, or to prevent mold from occurring, and if necessary, to remove mold from the surface of an inorganic agent. This is a problem for anti-mold repair methods for inorganic material surfaces that also prevent rust.

<Prior Art and Problems to be Solved by the Invention> Forces are often generated on the surface of inorganic materials for construction, especially in environments with high humidity. The growth of mold not only damages the exterior appearance, but also neutralizes the interior and causes rusting of reinforcing bars, often causing fatal damage to buildings.

Until now, there has been no effective means to prevent mold from forming on the surface of inorganic construction materials, and when mold occurs, chlorine-based chemicals (chlorine water, subzinc acid water, etc.) or caustic soda are used. The only way to do this was to wash it with a brush or the like. The reason for this is that the interior of inorganic materials for construction, such as mortar, is strongly alkaline, so mixing ordinary mold inhibitors into mortar, etc., or spraying (coating) them on the surface of the inorganic materials has little effect. Moreover, even if it had a temporary effect, it was not long-lasting due to its alkaline nature, so even if you took pains to reduce your strength, it would quickly return to its original state.

Therefore, the inventors selected an antifungal agent whose efficacy does not decrease even in strong alkalinity, and worked diligently to develop an antifungal repair method for the surface of inorganic materials using this agent, and as a result, the present invention was completed.

Means to solve problems〉 This application is comprised of the following three inventions.

(1) First invention: An anti-mold repair method for the surface of an inorganic material, which comprises applying and impregnating the surface of the inorganic material with an aqueous solution of an alkali-resistant anti-mold agent.

In this first invention, if mold has already grown on the surface of the inorganic agent of an already completed building, it is removed by cleaning, wiping, etc., and then an aqueous solution of the alkali-resistant agent described later is applied. It is applied and impregnated with.

(2) Second invention: An anti-mold repair method for the surface of an inorganic material, which comprises applying and impregnating the surface of the inorganic material with an aqueous solution of an alkali-resistant anti-mold agent, and then further coating the surface with a cement-based composition.

The second invention is to apply a topcoat of a cement composition after carrying out the construction method according to the first invention to prevent the antifungal agent from flowing out and to maintain its effectiveness.

(3) Third invention: After coating and impregnating the surface of the inorganic material containing the steel material with an aqueous solution of an alkali-resistant defense agent and at least one of the aqueous solutions shown in the following (A) and (B), An anti-mold repair method for the surface of inorganic materials, which further comprises applying a top coat of a cement composition.

(A) An aqueous solution of inorganic salts having a rust-preventing effect on the steel material.

(B) Aqueous solution of water-soluble silicate compound.

This third invention provides that when performing the mold prevention method according to the second invention, when the inorganic material is an inorganic material containing steel, the inorganic material is coated on the surface of the inorganic material with an aqueous solution of an alkali-resistant fungicide. An aqueous solution of a water-soluble silicate compound to prevent neutralization and to alleviate salt damage, and/or an aqueous solution of inorganic salts that have a rust-preventing effect on steel materials is coated and impregnated to prevent mold and mildew at the same time. The purpose is to prevent rust on reinforcing bars.

The alkali-resistant fungicide used in this invention is:
It refers to an antifungal agent that is effective even at a pH of 9 or higher, and mainly includes the following compounds (antifungal agents).

(1) 2(4thiazolyl)benzimidazole
[2-(4-thiazolyl)-benzi
midazol] (hereinafter referred to as TBZ) (2) Barium metaborate (3) Dodecylguanidine hydrochloride (Dodecylguanidine hydrochloride)
(anidine hydrochloride) (4) Polyhexamethylene piganazine hydrochloride (5) N-dimethyl-N'-phenyl (N'-fluorodichloromethylthio)-sulfamide [N-dimet
yl-N'-phenyl-(N'-fl
uor.

dichloromethylthio)-sulfam
ide ] (I6) bis -(Q -chloro
phenyl dic+uanido) -hexan
e dihydrochloride [10, In'-oxybisphenoxars
ine] (I82.4.5.6-tetrac
hlororisophtha-1onitril (9) 2-hydroxydiphenyl [2-hydroxydiphenyl] (I1) 3
-Methyl-4chloro-phenol [3-methyl-4
-chlorophenol (CI+) tolyltriazole (I2) benzotriazole The inorganic salts having a rust-preventing effect used in this invention include nitrites (especially calcium salts) and phosphates.

The water-soluble silicate compound used in this invention is
An alkali metal salt of silicic acid (especially lithium salt).

The cement composition used in this invention mainly refers to a mortar composition, and usually one to which the above-mentioned alkali-resistant fungicidal agent is added is used.

<Test Example> (1) Next, use mortar compositions ■ and ■ according to the formulations shown in Table 1 at the end of the book.
was created.

The materials used for this mortar are explained below.

(I) As the cement, ordinary Portland cement or white cement was used.

(II) The particle size of the crushed sand is desirably 0.6 mm or less in diameter since consistency deteriorates if silica sand with too large a particle size is used (for example, Toyo Silica Sand).

(III) As the methylcellulose, for example, Hi Metrose 90SH-4000cp (glyoxal-added hydroxypropyl methylcellulose) manufactured by Shin-Etsu Chemical Co., Ltd. was used.

(rV) Calcium stearate was manufactured by NOF.

These mortar compositions (1) are particularly suitable as tile joint materials, and the mortar composition (2) is an optimal formulation as a so-called base conditioner.

In addition, mortar prepared using white cement and JIS A
Recorded in 6916! ! A mortar (polymer cement-based base preparation coating material) was prepared.

The following (A) and (B) are applied to the surface of these four types of mortar.
) Two types of antifungal solutions ((A) 7%, (B) 4%) were applied and impregnated, and the samples were subjected to a fungicidal test.

Antifungal agent (A): Barium metaborate (Busanll)
-Ml manufactured by Sakai Chemical Industry ■).

Antifouling agent (B): Ta2 (ml-Tosite RN Takeda Pharmaceutical ■).

(2) Table 2 shows the characteristic values and results of the anti-mold test for the four types of mortar.

The method for measuring the characteristic values of mortar and the mold resistance test were conducted using the methods shown in Notes 1 to 7 below.

Note 1 ■, ■ The flow values of white cement and cement-based ground conditioner were determined in accordance with JIS R5201 (Physical test method for cement).

Note 2: After demolding, the specimens were cured in a constant temperature room at a temperature of 20°C and a humidity of 60%.

Note 3: Strength test and drying shrinkage test are each based on JIS
The test was conducted in accordance with R5201 and JIS A1129 (Length change test method for mortar and concrete).

Note 4: For the adhesion strength test, a JIS A3304 (concrete slab for sidewalks) standard product was used to wet the concrete surface and form the sample to a thickness of 2 mm. After the material was finished, a diamond cutter was used to cut it into 4 x 4 cm pieces until it reached the concrete surface, and an iron attachment for bond strength was attached using an epoxy resin adhesive.After the epoxy resin adhesive had hardened, it was cut using a Kenken-type tensile force tester. An adhesion strength test was conducted. Note that the adhesion strength was calculated using the following formula.

Note 5: For the surface crack test, a JIS A3304 (concrete flat plate for sidewalks) standard product was used, and the surface of Cosiclete was dampened with water and the sample was applied to a thickness of 2 mm to form the product. On the 28th, the wood was visually inspected to check for cracks.

Note 6: Mold resistance test is based on JIS Z 2911 (7)
Methods according to general industrial products and arbitrary methods were used.

(a) Method according to the general industrial products section of JIS Z 2911 The following five types of force are used.

Aspergillus niger FERM S-
1Penicillium citrinum F
ERM S-4Rhizopus 5toloni
fer FERM S5-7 Cradosporiu
cladosporioides FERM S-
8C5-8Chaetoi qlobosum F
ERM 5-11 After preparing a mixed suspension of these mold spores and spraying it on the mortar composition (sample), 28±
The cells were cultured for 4 weeks at 2° C. and a relative humidity of 95% or higher.

(b) Optional method The mortar composition (sample) was sprayed with the mold spore mixed suspension of (a), followed by a nutrient solution (1% peptone, 9% salt, 0% salt).
59. The cells were contaminated with an aqueous solution containing 0.59 ammonium chloride, 59 ml of urine, and 0.2 q of milk, and cultured for 4 weeks at 28±2° C. and a relative humidity of 95% or higher.

Note 7: The degree of growth of the mosquitoes was not clear with the naked eye, so it was confirmed using a stereomicroscope (x50). Furthermore, the meanings of the indications in Table 2 indicating the degree of mold growth are as follows.

Indication 3: No growth of mold hyphae is observed in the mold-inoculated part of the mortar composition (sample).

Indication 2: The area of the growth of fungal hyphae observed in the mold-inoculated part of the mortar composition (sample) does not exceed 1/3 of the total area.

Display 1: The area of the fungal hyphae growth area observed in the mold-inoculated part of the mortar composition (sample) exceeds 1/3 of the total area.

The results in Table 2 show that the mortar composition coated and impregnated with the alkali-resistant fungicidal agent according to the present application can sufficiently prevent the growth of mold.

(3) Furthermore, 0.0% of each of the above-mentioned (A) and (B) anti-mold agents was added to the above-mentioned four types of mortar compositions. 1 and 0.5%
When the same mold-proofing test as in (2) was conducted on the mortar composition prepared by adding this compound, the same results were obtained.

[Example 1] A building with exposed concrete finish, 7 floors above ground and 1 floor underground, 15 years after construction (ordinary concrete for 3 floors and below)
The surface of the concrete (lightweight concrete for the fourth floor and above) had become powdery, there were cracks, floating concrete, exposed reinforcing bars in many places, and black mold had grown in several places, so repair work was to be carried out.

The concrete in this building has a salt content of 0.042% (
0.16% of fine aggregate), and the carbonation depth is 25~
It was 35mm. In this construction, after the concrete surface was washed with high pressure water and dried, a surface reinforcing/alkalinizing agent containing 12% lithium silicate was applied twice with a roller brush and impregnated (4009/m) L, and then calcium nitrite was applied on top of it. Contains 30% of (rust inhibitor), barium metaborate (Busan 11-Ml manufactured by Sakai Chemical Industry ■), and 7% of TBZ (Courtside R-N Shikinichi Yakuhin Kogyo e!0), and 3 % solution with a roller brush and apply twice for impregnation (4009/rr?)
It was dried with a sieve. Furthermore, 0.1 of each of the above-mentioned antifungal agents was applied on top of it.
and 0.5% added polymer cement mortar (polymer type: S, B, R.

, polymer content: 4.5% solids, cement: sand = 1:1) was sprayed to a thickness of 2 mm, and after curing, a spray tile was finished by spraying on top of it.

When we conducted an investigation one year after the repair, no abnormalities were found.

[Example 2] There were many small cracks in the joints of the tile walls in the bathroom, and black mold had grown all over the place, which was fatal, so repair work was to be carried out.

In this construction, after cleaning the tile joint surface with a chlorine-based disinfectant solution to remove mold, barium metaborate (8usan l 1-Ml manufactured by Sakai Chemical Industry ■) and TBZ (Courtside R-N Takeda) were applied. A solution containing 7% and 3% of Yakuhin Kogyo@) was applied twice with a roller brush, impregnated, and dried. Furthermore, the mortar composition (2) to which the above-mentioned fungicide was added at 0.1% and 0.5%, respectively, was sprayed and finished.

When we conducted an investigation one year after the repair, we found that no mold had grown and no abnormalities were observed.

<Effects of the Invention> As described above, according to the anti-mold repair method for inorganic material surfaces according to the present invention, mold can be exterminated on the surface of inorganic materials in already completed buildings, and mold can be prevented for a long period of time. It has the effect of preventing the occurrence of rust and further preventing rust of steel materials among inorganic materials, if necessary.

Table 1 Table 2 Mortar physical property procedural amendment (voluntary) '' July 27, 1988 Director General of the Japan Patent Office Yoshi 1) Moon Takeshi °l Indication of the case 1988 Patent Application No. 122555 2 Name of the invention Inorganic Relationship with the Case of Person Who Amends Mold Surface Repair Method 3 Patent Applicant: 5-15-14 Ueno, Taito-ku, Tokyo 4th generation Director Onoda Co., Ltd. Director: 1-15-4 Tsutsumi, Shinbashi, Minato-ku, Tokyo -Building 4th floor @03 (59'l)07B5■ (1
) After spraying the spore mixed suspension on page 15, line 10 of the specification, nutrient solution (corrected to 1 peptone in 200 g of water).

(2) On page 18 of the specification, the fourth line from the bottom, the gold part is r.
Finished by applying ■. J, corrected.

Claims (11)

[Claims] (1) An anti-mold repair method for the surface of an inorganic material, which comprises applying and impregnating the surface of the inorganic material with an aqueous solution of an alkali-resistant anti-mold agent. (2) An anti-mold repair method for the surface of an inorganic material, which comprises applying and impregnating the surface of the inorganic material with an aqueous solution of an alkali-resistant fungicide, and then further coating the surface with a cement composition. (3) The anti-mold repair method for an inorganic material surface according to claim 1, wherein the cement composition is a mortar composition containing an alkali-resistant anti-mold agent. (4) The anti-mold repair method for an inorganic material surface according to claim 1, wherein the cement composition is a cement composition containing a polymer dispersion. (5) The anti-mold repair method for an inorganic material surface according to claim 7, wherein the polymer dispersion is a styrene-butadiene rubber dispersion. (6) After coating and impregnating the surface of the inorganic material containing the steel material with an aqueous solution of an alkali-resistant fungicide and at least one of the following aqueous solutions (A) and (B), a cement-based composition is further applied. An anti-mold repair method for the surface of inorganic materials, which is characterized by topcoating the surface of inorganic materials. (A) An aqueous solution of inorganic salts having a rust-preventing effect on the steel material. (B) Aqueous solution of water-soluble silicate compound. (7) The anti-mold repair method for an inorganic material surface according to claim 6, wherein the cement composition is a mortar composition containing an alkali-resistant anti-mold agent. (8) The anti-mold repair method for an inorganic material surface according to claim 6, wherein the inorganic salt is a nitrite. (9) The anti-mold repair method for an inorganic material surface according to claim 6, wherein the silicate compound is lithium silicate. (10) Claim 4, wherein the cementitious composition is a cementitious composition containing a polymer dispersion.
Anti-mold repair method for inorganic material surfaces as described in . (11) The anti-mold repair method for an inorganic material surface according to claim 7, wherein the polymer dispersion is a styrene-butadiene rubber dispersion.