KR19980013758A - Antibacterial-antimicrobial gypsum board and its manufacturing method. - Google Patents

Abstract

The present invention relates to an antimicrobial and fungicidal gypsum board and a method of manufacturing the same, and more particularly, to a method of manufacturing a gypsum board used as a building interior material by adding a fungicide agent directly to a gypsum slurry, The present invention relates to a gypsum board and a method for producing the gypsum board, wherein the gypsum board and the fungicidal effect are maintained for a long period of time without any additional sterilization and fungicide treatment.

Description

Antimicrobial and antifungal gypsum board and its manufacturing method

The present invention relates to an antimicrobial and fungicidal gypsum board and a method of manufacturing the same, and more particularly, to a method of manufacturing a gypsum board used as a building interior material by adding a fungicide agent directly to a gypsum slurry, The present invention relates to a gypsum board and a method for producing the gypsum board, wherein the gypsum board and the fungicidal effect are maintained for a long period of time without any additional sterilization and fungicide treatment.

The gypsum board has better fire resistance, insulation, construction and dimensional stability than other building materials, and is economical, so it is widely used as an interior material, but it exhibits weak physical properties when humidified. Particularly, since the gypsum bond method among various construction methods uses the plastered gypsum bond as an adhesive compared to the conventional wooden construction method, the gypsum board construction is not performed properly, and when the floor mortar work is performed, water is moved and spread on the gypsum board core material, .

At this time, when the absorbed moisture can not be sufficiently dried or the wallpaper is attached immediately, the moisture is not evaporated to the atmosphere, and the environment is stagnant and the mold is easily generated. As a result, the mold on the back of the gypsum board is causing the surface to expand.

In general, molds can be produced under conditions of 65% moisture, temperature 5 ~ 45 ℃, nutrients from organic matter, pH 2 ~ 8.5, but the mold is not likely to occur under dry conditions. Therefore, in order to solve this problem, it is necessary to sufficiently dry the gypsum board after the construction, but it takes a considerable time and is a problem in the progress of the construction, and in some cases, the antimicrobial agent emulsion for gypsum board is also applied.

After the gypsum board is actually attached, the antimicrobial agent emulsion is applied or sprayed on the surface of the gypsum board. However, this method is not only troublesome to work, it is difficult to uniformly apply coating, and the stability of the effect of bacteria and the effect is not sufficient. In addition, problems such as safety, durability and economical efficiency of the fungal agent have not yet been sufficiently solved.

In order to prevent the mold on the surface of the gypsum board, it is considered that it is sufficient to treat the surface with only mold fungus. However, when the fungus is generated on the back side of the gypsum board in fact, the fungus effect does not persist when the surface fungus is treated, It can not be removed. This is because there is a high possibility that nutrients, mold spores, and mycelium are transferred from the back side of the gypsum board together with water from the concrete wall and the back side of the gypsum board. Because the back of the gypsum board is not ventilated and the humidity is high and the mold is easy to breed, the prevention of mold on the back is a key factor in preventing mold on the surface.

In particular, the gypsum board itself contains pulp, gypsum coated raw material, starch, etc., and is the main nutrient source. The gypsum board has a pH of 4 to 7, so that mold can always be generated if the nutrient source, moisture, and temperature are maintained properly.

In order to solve the problem of mold generation on the back surface of the gypsum board, the present invention has developed a technology capable of uniformly inserting the gypsum board core itself into the gypsum board core itself to produce a gypsum board and an antimicrobial gypsum board.

Accordingly, the present invention provides a method for producing 2-N-octyl-4-isothiazolin-3-one or diadodimethyl-3-one which does not change the physical properties of the gypsum board itself, A new type of antimicrobial and antimicrobial gypsum board excellent in antifungal property and superior in dispersibility, economical efficiency, storage stability and thermal stability than conventional ones using para-tolylsulfone or zinc dimethyldithiocarbamate The purpose is to provide a method.

The present invention relates to a gypsum board for use as a building interior material, characterized in that 0.01 to 0.2 parts by weight of an antibacterial / antifungal agent and 0.001 to 0.01 part by weight of a dispersing agent are contained in 100 parts by weight of gypsum in a gypsum mixed slurry.

Further, it is also characterized in that the above-mentioned antibacterial / antifungal agent and dispersant are stirred so as to be uniformly dispersed, and then added and added into the gypsum mixed slurry, followed by molding and drying in a molding machine, thereby producing an antibacterial / antifungal gypsum board.

Hereinafter, the present invention will be described in detail.

Unlike the prior art, the present invention uses a fungicide agent directly in a gypsum mixed slurry in a specific amount to provide a fungicide resistant to fungi and fungicide, A gypsum board excellent in stability and thermal stability can be produced.

In the present invention, since the raw gypsum and antifungal agent are mixed and homogenized in advance before the gypsum board is formed, the entire gypsum board core is treated with fungus to effectively prevent the generation of fungus and to perform the sterilization treatment at the time of construction, So as to obtain an advantage.

In addition, this method uses a liquid dispersant to uniformly disperse the antifungal agent in the gypsum mixed slurry, so that the antifungal agent is uniformly distributed throughout the core during molding of the gypsum board, so that the antifungal effect is maintained for a long period of time. It is not only superior in safety but also substantially reduces fungal growth on the back of the gypsum board and fungus spread to the surface furrow. Since the liquid dispersant is used instead of the powder, the uniformity of the kneading property is excellent, and additional devices such as a mixer are unnecessary, which is advantageous in that it is easy to use because it requires less energy. For this reason, fungicides used for gypsum board require the following characteristics.

First, mixing and dispersion with raw gypsum should be easy.

Second, storage stability should be maintained for a long period of storage.

Fifth, the gypsum board must have thermal stability to reduce the effect or not to decompose even at the temperature of 160 ~ 200 ℃ during drying process,

Fourth, it is necessary to have persistence that the mold fungus effect is kept long even after use,

Fifth, it is necessary to use antifungal agent which is excellent in toxicity and safety and does not cause environmental pollution.

The antifungal agent used in the present invention has the above requirements and is preferably insoluble or hardly soluble in water. Examples thereof include zinc dimethyldithiocarbamate, zinc ethylene bis (dithiocarbamate), zinc 2 2-N-octyl-4-isothiazolin-3-one, diiodomethyl-para-tosylsulfone, 2,3,5,6-tetrachloro- (Trichloromethylthio) phthalamide, 2-methylcarbonyl-aminobenzimidazole, 2,4,5,6-tetrachloroisophthalonitrile, 3-iodo-2-propanylbutyl Carbamate and 4,5-dichloro-2-N-octyl-4-isothiazolin-3-one can be used.

If the mold fungus is water-soluble, the fungicide effect in the gypsum board is deteriorated due to the water being easily released to the outside as the moisture gets cold or the water flows down.

Therefore, in the present invention, 2-N-octyl-4-isothiazolin-3-one or diadodimethyl-para-tolylsulfone or zinc dimethyldithiocarbamate Is preferably used.

According to the present invention, the antifungal agent is used in an amount of 0.01 to 0.2 parts by weight based on 100 parts by weight of the gypsum to be used, and as the dispersant, 0.001 to 0.01 part by weight of a polyoxyethylene-based anionic surfactant is added per 100 parts by weight of the gypsum If the amount of the fungicide and the dispersant used is too small, the dispersing effect and fungicidal effect are decreased. If the amount is too much, the drying time of the gypsum board or the adhesion and economical efficiency between the paper and the gypsum board are adversely affected. In addition, a carrier such as diatomaceous earth, clay, kaolin, and calcium carbonate may be added and used together to improve dispersibility.

As described above, the antimicrobial and antifungal gypsum board containing the antifungal agent according to the present invention can be applied to molds grown on the gypsum board, namely, Aspergillus nigar, Penicillium citrinum, Cladosporium heruberum, Oleobastium blurans, Alternaria tenuis, Coriolus versicolor, Chaetomium globosum, and the like. Lt; / RTI >

The method for producing the bactericidal and fungicidal gypsum board of the present invention containing the above-mentioned composition is as follows.

In the method of producing the gypsum board of the present invention, 0.01 to 0.2 parts by weight of an antibacterial and antifungal agent and 0.001 to 0.01 part by weight of a dispersant are added to 100 parts by weight of gypsum used in the pulp slurry. When the stirring speed of the pulp slurry solution into which the dispersant is added is stirred at a rate of 200 rpm or more per minute, the hydrophobicity of the antibacterial agent is changed to hydrophilic by changing the ion distribution of the dispersed electric double layer and dispersed into fine particles by emulsification. This prevents refinement of the particles.

Finally, the gypsum board is manufactured through molding and drying processes in a molding machine.

Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited to the examples.

Example

Example 1

0.15 part by weight of pulp was added to 100 parts by weight of the gypsum to be used, 0.01 part by weight of 2-N-octyl-4-isothiazolin-3-one or diadodimethyl- para-tolylsulfone or zinc dimethyldithiocarbamate 0.005 part by weight of a polyoxyethylene anionic surfactant as a dispersing agent and 30 parts by weight of water were charged into a mixing tank and stirred at a speed of 200 rpm or more per minute with a stirrer to uniformly disperse the antifungal agent in the pulp slurry solution, , A hardener, and an admixture are uniformly mixed, a disk-type kneader is uniformly mixed and discharged into a slurry state, and then the mixture is poured on a continuously running surface paper. The surface paper is then covered with a roller type molding machine, . The gypsum board was cured through a hydration process, passed through a dryer, and then subjected to a cutting process to produce a gypsum board having sterilization and antifungal properties.

Example 2

0.05 parts by weight of 2-N-octyl-4-isothiazolin-3-one or diadodimethyl-para-tolylsulfone or zinc dimethyldithiocarbamate was used as the sterilizing agent in the same manner as in Example 1, Was used in the same manner as in Example 1. < tb > < TABLE >

Example 3

0.1 parts by weight of 2-N-octyl-4-isothiazolin-3-one or diadomethyl-para-tolylsulfone or zinc dimethyldithiocarbamate was used as the sterilizing agent in the same manner as in Example 1, , And 0.01 part by weight of a polyoxyethylene surfactant as a dispersing agent were used.

Example 4

0.05 parts by weight of 2-N-octyl-4-isothiazolin-3-one and zinc dimethyldithiocarbamate were added to the same composition and method as in Example 1, and polyoxyethylene-based And 0.01 part by weight of a surfactant were used.

Example 5

0.2 parts by weight of 2-N-octyl-4-isothiazolin-3-one or diadodimethyl-para-tolylsulfone or zinc dimethyldithiocarbamate was used as the sterilizing agent in the same manner as in Example 1, Was used in the same manner as in Example 1. < tb > < TABLE >

Comparative Example 1

0.001 part by weight of 2-N-octyl-4-isothiazolin-3-one or diadodimethyl-para-tolylsulfone or zinc dimethyldithiocarbamate as a disintegrant, 0.003 part by weight of a polyoxyethylene- Was prepared in the same manner as in Example 1,

Comparative Example 2

100 parts by weight of gypsum, 35 to 45 parts by weight of water, 0.08 to 0.09 parts by weight of pulp, 8 to 10 parts by weight of a curing accelerator, 0.1 to 0.2 parts by weight of a lightening agent and 0.8 to 1.2 parts by weight of starch were mixed and uniformly stirred, The surface slurry for the gypsum board was adhered to the surface of the gypsum board, followed by cutting and drying to prepare a general gypsum board.

Comparative Example 3

The composition was prepared by the same composition and method as in Comparative Example 2 except that the base material for gypsum board was replaced with a disinfecting agent, 2-N-octyl-4-isothiazolin-3-one or diadodimethyl- And 0.01 part by weight of carbamate was applied to a coated paper by a spray coating method or a shredded method.

Experimental Example

Three gypsum board specimens (9 mm in thickness) prepared in Examples 1 to 5 and Comparative Examples 1 to 3 were prepared (except for Example 4) to test the effect of sterilization and fungicidal action. The average time (days) for antifungal agents observed over time in the initial occurrence of fungi on the surface of the gypsum board is shown in the following Table 1 Respectively.

division Antifungal agent Example 1 2 3 4 5 Comparative Example 1 2 ^(e) 3 Initial mold development time (days) (a) 31 56 77 - 100 8 - 6 (b) 33 62 94 - 100 7 3 8 (c) 42 74 100 - 100 8 - 7 (d) - - - 98 - - - -

(A) 2-N-octyl-4-isothiazolin-3-one

(b) Diiodomethyl-para-tosylsulfone

(c) Synthesis of zinc dimethyldithiocarbamate

(d) 2-N-octyl-4-isothiazolin-3-one / zinc dimethyldithiocarbamate

(e) No sanitizer used

As shown in Table 1 above, the present invention proves that the initial fungus development time is superior to that of the comparative example. Thus, the gypsum board having the moldy mold performance manufactured according to the present invention has a good appearance, It can be used very usefully in places where hygienic environment maintenance is required such as companies, pharmaceutical companies, cosmetics companies, restaurants, and dormitories. Especially, it is possible to prevent molds generated on gypsum boards such as apartments and underground buildings, Can also be used to prevent the occurrence of continuous fungi.

The present invention is more effective not only in shortening the working air but also in terms of dispersibility, stability, economical efficiency and fungicidal effect, rather than a method of applying or spraying a conventional antifungal agent, and thus it can be practically used in various fields.

Claims (5)

A gypsum board for use as a building interior material, comprising 0.01 to 0.2 parts by weight of an antibacterial / antifungal agent and 0.001 to 0.01 part by weight of a dispersant, based on 100 parts by weight of a gypsum used in a gypsum mixed slurry, Sex plaster board. The method of claim 1, wherein the antifungal agent is selected from the group consisting of zinc dimethyldithiocarbamate, zinc ethylenedi dithiocarbamate, zinc-2-pyridine-thiol-1-oxide, (Trichloromethylthio) phthalamide, 3-iodo-3-methyl-2-pyrrolidinone, 2-propanylbutylcarbamate, 4,5-dichloro-2-N-octyl-4-isothiazolin-3-one, 2-methylcarbonyl-aminobenzimidazole and 2,4,5,6-tetra And chloroisophthalonitrile. ≪ RTI ID = 0.0 > 5. < / RTI > The antimicrobial and antimicrobial gypsum board according to claim 1, wherein the dispersant is a polyoxyethylene anionic surfactant. A method for manufacturing a gypsum board for use as an architectural interior material, which comprises adding 0.01 to 0.2 parts by weight of an antibacterial / antifungal agent and 0.001 to 0.01 part by weight of a dispersant to 100 parts by weight of a gypsum used in a pulp slurry, Mixing the slurry with a gypsum mixed slurry comprising gypsum, water, a hardener and an admixture, mixing the slurry uniformly, and then molding and drying the slurry in a molding machine to produce a sterilized gypsum board. 5. The method according to claim 4, wherein the stirring speed is 200 rpm or more per minute.