JPS5837502B2 - hygrometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hygrometer that uses a paint that reversibly changes color with changes in relative humidity (hereinafter referred to as humidity).

Conventionally, there are two simple methods for measuring humidity: one using a psychrometric bulb hygrometer and the other using a hair hygrometer.

The former method requires a certain degree of skill to accurately measure the wet bulb temperature and is complicated, such as using a humidity table.

The latter type uses fragile hair, so it is prone to breakdowns, and, with the exception of high-grade models equipped with a calibration device, they have drawbacks such as low reliability of indicated values, and all of them are suitable for use in general homes and offices. It has not been popular as a humidity measuring device for a long time.

The purpose of this invention is to create a hygrometer that anyone can use to accurately measure humidity in general homes, offices, and other places using paint that reversibly changes color depending on humidity.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The lower part 1 in Fig. 1 is a dial, on which numbers (numbers) indicating humidity are written.

The upper part 2 is a painted board using a transparent thin plastic plate, and has 6 rectangular frames (the length of each rectangular side must be at least 2 mm). is coated with paint that reversibly changes color due to changes in humidity (hereinafter referred to as color-changing paint), and the areas 4, 5, and 5 in the lower left half of the rectangular frame are
On the back of numbers 6, 7, 8, and 9, there are ordinary paints of the same color tone as the color-changing paints (which do not change color due to changes in humidity, and will be compared below) at the humidity of the number written below. (called paint) is applied.

Therefore, the method for producing the above-mentioned color-changing paint consists of 100 parts of ammonium molybdate (weight ratio, same hereinafter), 70 parts of oxalic acid,
1 part was dissolved in 400 parts of sulfite water (8%), 6 parts of 1-amino, 2-naphthol, and 4-sulfonic acids were added thereto, and the mixture was placed in a covered acid-proof container and heated in a hot bath. After the reduction reaction was completed, the mixture was filtered. Then, the filtrate is further heated in a hot bath and evaporated to dryness.

To this dry matter, 290 parts of methyl alcohol and 42 parts of oxalic acid.
The dissolved components are completely dissolved, and the latter is separated and removed by filtration.

The weight of the undissolved matter removed by this after drying (light color) is about 120 parts.

Heat this methyl alcohol solution and reduce the liquid volume by 31/5.
To 100 parts of this concentrated liquid, 60 parts of Cerasocnis (50% content), 480 parts of fine titanium dioxide powder, and 0.25 parts of Alizarin R were added and shaken, and the temperature was reversed by changing the humidity. Obtain color-changing paint.

Immediately after application, this paint is a grayish color close to white, but when it dries it turns dark blue.

(However, if the environment is low humidity.

), without turning it into a paint, use the methyl alcohol solution,
It can also be used as a sheet that changes color depending on humidity by soaking it in paper or the like and drying it.

The color tone that a color-changing paint exhibits at each humidity level is determined by selecting the closest color from the standard color sample book for paints (1950 edition) of the Japan Paint Manufacturers Association.

Humidity Sample book color number 50φ F9-806 60 units F9-805 70φ Intermediate color between F9-805 and F9-802 80 degrees F9-802 90φ F9-833 100% F5-344 Therefore, for example, when the humidity is 70%, The rectangular frame just above it is written in one color, and the other frames are divided into two colors, upper and lower, through diagonal lines, so we know from this that the humidity is 70%.

Although FIG. 1 shows a humidity difference of 10 intervals, it is possible to identify the humidity difference by 5 degrees with the naked eye.

1. By overlaying a pale brown transparent film on the front of the painted board, it eliminates confusion in visual judgment due to subtle differences in color brightness between the color-changing paint and the comparison paint, and improves the color density of the color-changing paint. Find matching paints more easily,
Therefore, humidity can be measured more easily and accurately.

Next, FIG. 2 is a perspective view of the entire hygrometer with the painted plate and dial plate attached to the mounting frame.

The top and bottom are open, allowing air to circulate freely.

In addition, the painted board is designed so that it can be removed at an angle so that the painted surface (back surface) faces diagonally downward, and can be easily replaced.

Paint generally fades and discolors due to exposure, but as can be inferred from its properties, discolored paint has a strong tendency to do so.For example, as it repeatedly discolors due to changes in humidity,
The surface layer of the paint may exhibit a phenomenon similar to chalking, and the color tone may change.

Furthermore, it has a tendency to fade due to the adhesion of salts such as sodium chloride.

The structure of the hygrometer described above is designed to minimize these negative effects.

Painted boards are replaced with new ones after a certain period of use, but if you put a spare painted board for replacement in a polyethylene bag and store it in a dark place, its performance will not change at all for a long time. .

As explained above, this invention is a new method for measuring humidity whose principle is completely different from conventional methods, and it cannot be used as an immediate substitute for conventional methods in both academic and industrial fields. However, it is possible to use inexpensive equipment to check whether the environment has the appropriate humidity in general homes, offices, etc.
It has the effect that anyone can understand it easily and correctly.

[Brief explanation of drawings]

FIG. 1 is a front view of the main parts of one embodiment of the present invention, and FIG.
The figure is a perspective view of the entire hygrometer to which the one shown in FIG. 1 is attached. 1...Dial board with number (ta) indicating humidity written on it,
2...Painted board with 6 rectangular frames, 3...
...Area of the upper right half of the rectangle, 5, 6, 7.8, 9...
... Area of the lower left half of the rectangle, 10 ... Mounting frame.

Claims (1)

[Claims] 1. Dissolve oxalic acid and ammonium molybdate in sulfite water (80%), add 1-amino-2-naphthol-4-sulfonic acid, heat reduction, and evaporate to dryness. The resulting solid contains 1-oxalic acid. Areas coated with paint that reversibly changes color due to changes in relative humidity, which is created by adding methyl alcohol to extract only the dissolved substances, and then adding ceramic varnish, fine titanium monocide powder, and a small amount of dye. The hygrometer is characterized in that the relative humidity is measured by comparing the area to which a normal paint of the color tone that the paint exhibits at each relative humidity is applied.