JPS59450A - Dewing preventing sheet - 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 The present invention relates to a dew condensation prevention sheet for preventing damage to houses, furniture, etc. by suppressing condensation that occurs in closets, attics, etc. of houses during winter or low temperatures.

Condensation can be seen in closets, north and west back walls, attics, etc. of houses at low temperatures or high humidity. Various methods have been used to prevent this condensation. The method is ■insulation, ■ventilation,
■Humidity control is broadly divided into three types. Among these, various construction methods are used for the purpose of controlling humidity as shown in (■), but many of them are wet construction methods such as troweling, spraying, and gauging, such as wall mud, plaster, and anti-dew coatings. This caused many problems, such as contamination of the work site, delays in the construction period, and the need for skilled engineers.

In addition, when using a dry construction method instead of the wet construction method described above, most of the methods use boards, panels, etc. These materials are hard and cannot be folded or rolled up, so they require a lot of effort to transport and store. Furthermore, they are difficult to use on curved surfaces, corners, etc., and once they absorb water, they require a lot of effort to transport and store. The disadvantage is that it is difficult to dry. On the other hand, using flexible wallpaper or wall sheets instead of boards or panels is easier to install, but due to the nature of the material, it cannot be expected to retain much water, and instead often exacerbates damage caused by condensation. is the current situation.

The dew condensation prevention sheet of the present invention solves the above-mentioned difficulties and is a combustible sheet that has water absorption and moisture release properties. Its structural feature lies in the fact that it is made into a sheet by foaming and shaping powder, which itself has water absorbing and retaining ability, and raw materials mainly consisting of various emulsions.

The structure of the present invention will be described in detail below according to specific drawings and manufacturing methods.

FIG. 1 is an enlarged cross-sectional view of the dew condensation prevention sheet according to the present invention, enlarged approximately several hundred times. In the present invention, the water-absorbing and moisture-releasing porous layer (1) of the sheet is porous, and the pore size is relatively large (2) of about 100 to 200 μm, and medium pore size of about 20 to 50 μm. (3),
and minute particles (4) of 0.5 μm or less. Depending on the usage, a mixture of these may be used.
It is formed on a flexible sheet (5) as seen in the figure. This flexible sheet (5) is coated with a water-absorbing and moisture-releasing porous layer (depending on the type of binder used for υ and the purpose of use, the flexible sheet (5) may not be necessary.

A water-absorbing and moisture-releasing porous layer (hereinafter simply referred to as a porous layer) absorbs water (moisture absorption) when the indoor air is humid enough to cause dew condensation.
It exhibits water absorption and moisture release properties, and on the other hand, when the indoor air is dry, it releases an appropriate amount of moisture. Such a porous layer itself can form a dew condensation prevention sheet as described above. The formation of this porous layer is based on inorganic powders (particle size 1 to 30μ) that themselves have water retention properties, such as calcium silicate, diatomaceous earth, perlite, vermiculite, mica, etc., and polyvinyl acetate, polyvinyl acetate, etc. It is made by adding a foaming agent to a binder made of an aqueous emulsion such as an acrylic or synthetic rubber latex emulsion, especially a thermally crosslinkable emulsion with excellent water resistance of the film, or by foaming with air entrainment.

K, which forms the porous layer on the flexible sheet (5), is prepared by applying a composition consisting of the main material of the inorganic powder, a binder, and a foaming agent to a spraying machine, a roller coating machine, etc., although it varies depending on the properties. It takes approximately 5 to 30 minutes.

The thickness of the coating film is preferably about 1 to 6 mm. If a porous layer (υ) is made of inorganic powder, it will be hard and will easily break or crack during winding and folding. However, in the present invention, this problem is solved by using foam in the binder. The solution was to use a flexible binder that can be shaped into a shape.

The porous layer formed as described above contains a large number of small pores of 0.5 μm or less (4
), medium pores of 20-50 μm (3) created between the aggregates, and 100 μm created by foaming of the binder.
Relatively large pores (2) of about ~200 μm are mixed,
It has a water retention capacity of approximately 700 f or more in terms of li (law thickness), and also has the property of drying rapidly when the surrounding area is dry. Therefore, the moisture content in the living space can be effectively controlled.

This will be explained below using specific examples.

Example 1 The formulation shown in Table 1 below was sufficiently cross-dispersed using a kneader or three-roll machine to obtain a viscosity of 12.000 c.
Make it into a paste of ps. The resulting paste is stirred for about 10 minutes using a high-speed stirrer (2,500 rpm), and foaming is performed by air entrainment until the bulk specific gravity reaches 0.59A.

Did you prepare a separate paste that has been sufficiently foamed evenly? '! 0.1 +U waterproof paper was coated to a thickness of 51.5 mm using a flow coater, knife coater, etc. After drying this sheet-like material at 80°C for 15 minutes,
The crosslinking was stabilized by heating at 150° C. for 5 minutes.

The sheet obtained as shown in Table 1 has combustible properties that are easy to handle, and it still has a very high hygroscopicity of 100°f/n/, so it has sufficient performance as a dew condensation prevention sheet. It was confirmed that it has.

Example 2 The formulation shown in Table 2 was kneaded in the same manner as in Example 1 to form a paste with a viscosity of 15,000 cps, and this was applied to a thickness of approximately 1 mm on waterproof paper as a visibility sheet. . Then 1
After foaming at 20°C for 5 minutes, curing was subsequently performed at 150°C for 4 minutes to obtain a foamed sheet with a thickness of 2+u. The obtained sheet has sufficient sinterability (1400f
It had a hygroscopicity of more than /vf.

Since the dew condensation prevention sheet of the present invention has the structure described in detail above, ■ it can be handled in the form of a roll, folded folded item, etc. during storage and transportation; ,
It can be cut and bent freely like normal wallpaper, and can be applied to most materials such as concrete, plywood, plastic, and metal using adhesives. Furthermore, since the above construction method is used, it has the following characteristics: (1) easy construction and low construction cost; Furthermore, in addition to its effectiveness in terms of construction, it also has the following effects: ■ It regulates the humidity in the living space, making life more comfortable, and ■ It also has the effect of preventing corrosion of houses and furniture caused by condensed water. That's what I'm doing.

These characteristics can be used to prevent dew condensation for residential use, as well as mats for preserving the freshness of vegetables and fruits, and for maintaining the shape of corrugated pole boxes for packaging fresh fruits, etc., in fields where moisture is involved and can cause harm. This sheet can be widely applied to the modification of

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of the dew condensation prevention sheet. (υ Water absorption and moisture release porous layer < 2) Large pores of about 100 to 200 μm (3) 2
Moderate pores of about 0 to 50 μm (4) Minute pores of 0.5 μm or less (5) Flexible sheet or more Number of applicants Company 3 Representative Patent Attorney Hirozo Mori Department Figure i

Claims (1)

[Claims] 1. A dew condensation prevention sheet with water absorption and moisture release properties, which is formed by foaming and shaping a powder that itself has water absorption and retention ability and a raw material mainly consisting of various emulsions.