JPH0469301A - Building board and its antifungal treatment - Google Patents

Abstract

PURPOSE:To carry out the subject antifungal treatment by drying a base paper for a board, a nonwoven fabric, etc., applying an aqueous solution of a pyrithione-based derivative thereto using the coating method or the spraying method before or after winding and making to adhere it to the surface of a building board. CONSTITUTION:A building board using, as its surface material, a base paper for a board or a nonwoven fabric having an antifungal agent mainly composed of a pyrithione-based derivative adsorbed thereon. The above-mentioned board is produced, e.g. by drying the base paper for the board, the nonwoven fabric, etc., subsequently applying 0.1-10wt.% aqueous solution containing the pyrithione- based derivative as the main component thereto using the coating method or the spraying method before or after winding for bonding it to the surface of the building board, or by cast molding a gypsum main material alone or in combination with admixtures on the above-mentioned base paper for the board or on the nonwoven fabric and, after coagulation, carrying out drying and curing. As the above-mentioned production method is free from deterioration of the antifungal properties due to heating, execution is possible in the entirely same way as in case of an untreated material.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an architectural board using board base paper or nonwoven fabric as a surface material for interior construction work, and a method for mold-proofing the same.

(Conventional technology) Mold and its spores are constantly scattered around buildings and their surroundings, and when they propagate, they not only cause disgust due to external contamination, but also cause material deterioration due to mold propagation, and diseases caused by mold bacteria. There are many issues of concern, such as allergic diseases, which have a direct negative impact on the human body.

For this reason, if mold contamination was suspected, a fungicide was applied to the surface of the building board at the site before it was erected indoors.

As for post-treatment, once mold or mildew has formed on the surface of the board, it is sterilized using an alcohol-based disinfectant, followed by further sterilization and bleaching using a sodium hypochlorite solution or the like.

In this way, most of the construction interior construction work involves anti-mold treatment for architectural boards during construction, or post-treatment after mold occurs, rather than anti-mold treatment during manufacture.

(Problem to be solved by the invention) Work efficiency is poor in on-site mold prevention treatment and treatment work after mold occurs, and in particular, post-treatment work involves moving indoor objects, which is extremely disadvantageous in terms of work efficiency. Met.

In addition, there are some boards that are treated with anti-mold treatment during manufacturing, but the anti-mold agent deteriorates due to the heat load received during the drying process during manufacturing, and the mold resistance required during construction cannot be expected.

This does not meet the architectural requirements for mold resistance, which should only be exhibited during construction and use.

The present invention has been made in view of the above circumstances, and its purpose is to provide a building board that can exhibit sufficient mold resistance during construction and use, and a method for treating the board to prevent mold.

(Means for Solving the Problems) In order to achieve the above object, the architectural board of the present invention and its fungicidal treatment method are provided by using a board base paper or a non-woven board to which a fungicidal agent containing a pyrithione derivative as a main component is adsorbed. was used as the surface material for architectural boards.

In addition, as for processing methods, board base paper, nonwoven fabrics, etc.
After drying in the winding process, either before or after winding, an aqueous solution containing a pyrithione derivative as a main component at a concentration of 0.1 to 10% is applied or sprayed onto the base paper nonwoven fabric, etc. It is attached to the surface of the board. Or, for board base paper, non-woven fabrics, etc., in the drying and winding process,
After drying, 0.1 to 10% either before or after winding
An aqueous solution containing a concentrated pyrithione derivative as a main component is applied or sprinkled on the board base paper, nonwoven fabric, etc. to produce the board base paper together with gypsum as a main material or a mixed material thereof.

It is poured and molded onto a nonwoven fabric, solidified, and then dried and cured. Alternatively, board base paper, nonwoven fabrics, etc. can be dried and
In the winding process, after drying, an aqueous solution containing pyrithione derivatives as a main component at a concentration of 0.1 to 10% is applied or sprinkled on the board base paper, nonwoven fabric, etc. either before or after winding. After forming and condensing the material or the mixed material together with the mixed material, the base paper, nonwoven fabric, etc. may be adhered to the surface of the molded board before drying and curing, and then drying and curing together with the board.

(Function) The board base paper and nonwoven fabric, which are the surface materials that make up architectural boards, have been adsorbed with pyrithione derivatives in advance, so the grip of the anti-mold agent is strong, and high mold resistance is maintained during construction. Maintained.

These fungicides are made into an aqueous solution, and applied and adsorbed onto base paper or nonwoven fabric during the manufacturing process in order to uniformize the treatment concentration and strengthen grip strength, and to improve dispersibility.

These fungicides show almost no deterioration after heat treatment.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 shows a construction board 1 which has certain standardized dimensions vertically and horizontally, and has a surface material 3 on the front and back sides of the main material 2, either by pouring integral molding or by pasting it with an adhesive or the like. It's in close contact.

The main material 2 is mainly composed of gypsum, but as in JP-A-1-157476 previously filed by the present applicant, in addition to the main material of gypsum, in order to improve water resistance and ensure dimensional stability, It may be a material mixed with a mixture of slag, cement, a foaming agent, etc. and then cured at a high temperature, or it may be a gypsum board.

The surface material 3 is board base paper, nonwoven fabric, or the like.

The manufacturing process for surface material 3 is broadly divided into four steps: paper forming, pressing, drying, and winding. An applicator is installed between these drying and winding steps, and a pyrithione derivative with an O concentration of 11 to 10% is mainly used. Apply the aqueous solution containing the ingredients to the board base paper using the above applicator.
It is applied or sprayed onto a surface material 3 such as non-woven fabric.

The surface material 3 and main material 2 manufactured in this way are manufactured into products through a drying process or a drying curing process at 100°C to 160°C on a production line for architectural board 1.

That is, the surface material 3 may be attached to the main material 2, or if the main material 2 itself requires drying and curing, the surface material 3 may be set before the drying process, or after the main material 2 has set. After the surface material 3 is attached, the main material 2 and the surface material 3 may be dried and cured together.

For the sake of clarity, comparisons between sodium pyrithione derivatives and zinc pyrithione derivatives and other fungicides are illustrated in FIGS. 2 to 5.

Figure 2 shows 16 types of fungicides. About 1 g/d of these fungicides were adsorbed onto the board base paper by the method described above, and this was dried with hot air at 160° C. for 24 hours to obtain 16 types of samples.

The six types of mold fungi listed in FIG. 3 are individually attached to the sample.

That is, the sample is placed on the center of the culture surface of a flat plate medium, and a spore suspension containing the fungal spores listed in Figure 3 is evenly spread on the culture surface and the sample surface, and then the temperature is 28℃ and the humidity is 95℃.
Figure 4 shows the results of culturing for 4 weeks at % or more and observing the status of mold growth.

In Figure 4, the numbers given to each fungicide in Figure 2 are written in the horizontal axis direction, and the degree of mold spread is shown in the vertical axis.
It is a bar graph expressed as , and the period is displayed using the shading of the graph.

1 in the vertical axis direction indicates that the area of mycobacterial growth observed in the sample or a portion close to the sample exceeds 1/3 of the sample area, 2 indicates that the area does not exceed 1/3, and 3 indicates that the mycelium growth area is not greater than 1/3 of the sample area. It represents an unacceptable level.

According to this Figure 4, the fungicides at points 8 and 9 in the horizontal axis direction, that is, the fungicides containing pyrithione-based derivatives as the main component, exhibit the best mold resistance. After that, no mycelium was observed to grow.

In the same way, board base paper treated with a pyrithione zinc derivative was attached to the surface of the foamed gypsum panel, saturated with water, and a mixed spore suspension of 8 types of mold and fungi as shown in Figure 5 was applied. After coating, the condition was observed for over a month at a temperature of 25° C. and a humidity of 95% or more, but no growth of mycelium was observed.

(Effects) As explained in detail above, according to the architectural board and the method for anti-mold treatment of the present invention, the anti-mold treatment is applied at the time of manufacture of the board, and there is no deterioration in mold resistance due to heat.
It can be constructed in exactly the same way as untreated materials, improves the efficiency of on-site work, is less likely to cause variations in construction, and has the effect of maintaining high mold resistance.

When drying a board containing a mixed material whose main material is gypsum for construction boards at high temperatures, we dry these surface materials as the main material in advance so that the board base paper and nonwoven fabric coated with fungicides are also dried at high temperatures together. If it is attached to the surface after solidification, or if the main material and surface material are poured and integrally molded, and then dried and cured after solidification, it has the effect of simplifying the processing steps for board base paper and nonwoven fabric.

[Brief explanation of drawings]

Figure 1 is a perspective view of a construction board, Figures 2 to 5 are diagrams for comparing and clarifying the antifungal performance, Figure 2 is a list of the fungicides used, and Figure 3 is a list of the fungicides used. FIG. 4 is a graph showing the state of generated mold, and FIG. 5 is a list of mold mycelium used to show another example. 1... Architectural board 2... Main material 3.
...Surface material patent applicant Himoma Obayashi Co., Ltd.
Naigai Mokuzai Co., Ltd. Figure 1 Figure 3 Figure 2 Figure 5

Claims (4)

[Claims] (1) An architectural board characterized in that the surface material of the architectural board is base paper or nonwoven fabric to which a fungicide containing a pyrithione derivative as a main component has been adsorbed. (2) For board base paper, nonwoven fabrics, etc., after drying in the drying and winding process, 0.1 to 10% is applied either before or after winding.
A method for anti-fungal treatment of architectural boards, which comprises applying or spraying an aqueous solution containing a concentrated pyrithione derivative as a main component to the board base paper, nonwoven fabric, etc., and pasting this onto the surface of the architectural board. (3) In the drying/winding process for board base paper, nonwoven fabrics, etc., after drying, either before or after winding, the
% concentration of an aqueous solution mainly composed of pyrithione derivatives is applied or sprinkled on the board base paper, nonwoven fabric, etc., and the gypsum base material or this together with a mixed material is poured onto the board base paper or nonwoven fabric and molded, and after solidification, A method for anti-fungal treatment of architectural boards characterized by dry curing. (4) In the drying/winding process for board base paper, nonwoven fabrics, etc., after drying, either before or after winding, the
% concentration of an aqueous solution containing pyrithione derivatives as the main component is applied or sprinkled on the board base paper, nonwoven fabric, etc., and after forming and solidifying the gypsum base material or this together with the mixed material, the base paper, nonwoven fabric, etc. is dried and cured. A method for anti-fungal treatment of architectural boards, characterized in that the above molded boards are adhered to the surface and then dried and cured together with the boards.