JP4774752B2 - Humidity control molded body and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a humidity control molded article having both hygroscopicity and hygroscopicity, which is mainly used for distributing under the floor of a house and adjusting the humidity of the part, and a method for producing the same.

The air under the floor of a detached house has a humidity almost in accordance with the humidity of the environment, but generally the circulation is not so good. It may be absorbed by tatami mats and cause mold. In order to prevent this, it is necessary to place a hygroscopic substance in a necessary part under the floor to absorb excessive moisture and lower the humidity. On the other hand, it dries in winter and the humidity under the floor is lowered, but it is desirable to increase the humidity in order to avoid cracks in the wood. In other words, it is necessary to use a humidity control material that absorbs moisture when the humidity is high and releases it when the humidity is low, that is, has a moisture absorption / release property.

Quick lime, calcium chloride, silica gel, and the like are known as moisture absorbents, but these do not have moisture release performance and do not function as a humidity control agent for the above-described uses. It is known that a porous substance is useful as a humidity control material, for example, a charcoal wrapped with non-woven fabric (Patent Document 1) or a porous powder solidified with cement (Patent Document 2). ), And spreading the remaining material of lightweight foamed concrete under the floor (Patent Literature 3, Patent Literature 4). In addition, a material with humidity control performance is molded into a board and stretched under the floor (Patent Document 5), or a porous material such as diatomaceous earth or zeolite is incorporated into an interior mat (Patent Document 6), and is applied to a nonwoven fabric. It has been proposed to use it (Patent Document 7).
JP 2004-132170 A JP 2002-114556 A JP-A-6-99063 JP 2003-313965 A JP 2002-155585 A JP 2004-176519 A JP 2004-176240 A

None of these techniques is sufficiently satisfactory in terms of moisture absorption / release performance and life of the humidity control material. Technology for hydrothermal synthesis by adding calcium compounds to fly ash (Patent Document 8), and technology for kneading and baking shells, charcoal, barley stone, tourmaline, etc. (Patent Document 9) Is disclosed. In addition, in order to enhance the hygroscopicity of the lightweight foamed concrete residual material, a technique (Patent Document 10 and Patent Document 11) for processing with high-pressure carbon dioxide gas has been attempted. Furthermore, a product obtained by drying agglomerates of granulated metal hydroxide (Patent Document 12) and a combination of zeolite and titanium oxide (Patent Document 13) also appeared. However, as for these, since the increase in cost cannot be avoided and the performance corresponding to it cannot be obtained, the practical molded object for humidity control has not yet appeared.
JP2002-348170 JP 2002-167287 A JP2001-240457A JP 2001-353418 A JP2002-1952 JP 2000-265580 A

When producing a humidity control material from a porous material, it is usually molded into a plate or granule, but a certain level of strength is required to prevent these molded products from being destroyed during transportation. It is also necessary to prevent disintegration due to repeated moisture absorption and release. There has also been a demand for an appropriate binder for ensuring such collapse resistance during use.

The object of the present invention is a molded body for humidity control that is mainly used under the floor of a house, has high moisture absorption / moisture release performance, and retains its shape even after repeatedly exhibiting a humidity control function. An object of the present invention is to provide a humidity control molded body having only a collapse resistance and capable of being manufactured at low cost, and a manufacturing method thereof.

The humidity control molded body of the present invention basically contains 50 to 70 parts by weight of calcium silicate material powder and 5 to 15 parts by weight of carbonaceous material powder as the humidity control component, As a binder , slaked lime or slaked lime and bentonite (in the case of combined use, 5 to 25 parts by weight ) are added and formed into an appropriate shape.

A preferred embodiment of the molded body for humidity control according to the present invention includes 50 to 70 parts by weight of a calcium silicate material powder, 5 to 15 parts by weight of a carbonaceous material powder, and a kaolin clay mineral. Powder 15 weight part or less is mix | blended, 15-25 weight part of slaked lime or slaked lime and bentonite (in the case of combined use) is added as a binder, and it shape | molds in a suitable shape.

Since the molded body for humidity control of the present invention has both high hygroscopicity and moisture release properties, it has a high humidity control function as a whole. The binder selected as being particularly suitable in the present invention, that is, the combination of bentonite and slaked lime has high crushing strength and high water disintegration resistance, as seen in the examples described later, and breakage during transportation and handling. The original shape is maintained even after a few and repeated moisture absorption and desorption. This humidity control molded body is almost white and does not have a so-called “cement color”, which is preferable from the viewpoint of beauty. Those granulated to have a substantially constant particle size are convenient for use under the floor. In addition to the above-mentioned floor, it can also be used for adjusting the humidity of the back of the ceiling. In that case, it is preferable to fill the bag with moisture permeability.

As the calcium silicate-based material, a tobermorite 5CaO.6SiO ₂ .5H ₂ O-based compound is suitable. Tobermorite can be synthesized by a SiO ₂ —CaO-based hydrothermal reaction. Lightweight building materials manufactured by autoclaving, typically lightweight cellular concrete, are mainly composed of tobermorite, so the remaining materials and end materials of these building materials may be crushed to form the calcium silicate-based material of the present invention.

As the carbonaceous material, activated carbon, lignite coke, charcoal and bamboo charcoal are useful, and one or more selected from these may be used.

As the kaolin clay mineral material, halloysite Al ₄ Si ₄ O ₁₀ (OH) ₈ .nH ₂ O is suitable. This material has a layered structure, a large specific surface area, and a high moisture adsorption performance. By adding this component, the humidity control function is improved. Halloysite also contributes to crush strength and water disintegration resistance.

As a binder component, it is recommended to use bentonite and slaked lime in combination. By using this binding material, the water disintegration resistance of the molded body is high. Disintegration due to repeated moisture absorption and release and disintegration when immersed in water are not the same phenomenon, but the nature of the latter is parallel to the former, so immersion in water is useful as a kind of accelerated test I know that. When the binder component is added so as to occupy 15 to 25 parts by weight in the composition of the humidity control molded body, and when bentonite and slaked lime are used in combination, each is 5 to 15 parts by weight and the total amount is the above It may be 15 to 25 parts by weight.

The production method of the present invention for producing any one of the above-mentioned shaped bodies for humidity control comprises 50 to 70 parts by weight of calcium silicate material powder, 5 to 15 parts by weight of carbonaceous material powder, and 0 powder of kaolin clay mineral. ~ 15 parts by weight and binder slaked lime or slaked lime and bentonite (total amount in the case of combined use) 15 to 25 parts by weight is kneaded with water and granulated, dried and the water content is 5% by weight or less Consist of.

Granulation can be carried out by any method, but rolling granulation of the above kneaded product with water added is appropriate, and a substantially spherical tempered molded product having a particle size of 1 to 30 mm is actually used. Convenient to use. A more preferable particle size is 7 to 13 mm. Even when granulated by other methods, it should be dried so that the moisture content of the molded article for humidity control is 5% by weight or less.

Using the following raw materials, water was added to those mixed at the blending ratios shown in Table 1, and a spherical shaped body for humidity conditioning having an average diameter of 10 mm was obtained by rolling granulation (Examples 1 to 3 ).
Humidity control ingredients: Tobermorite powder carbonaceous material: bamboo charcoal kaolin clay mineral material: halloysite clay (Kuzu production, Tochigi Prefecture)
Binder : Slaked lime or slaked lime + bentonite For comparison, a binder containing no slaked lime (Comparative Example 1), a carbonaceous material not added (Comparative Example 2), and the main component is tobermorite. A 5 to 15 mm crushed material (Comparative Example 3 ) obtained from an end material of a certain building material and a tobermorite powder in which only a binder was added to form a molded body (Comparative Example 4 ) were also prepared.

Table 1

About the Example and the comparative example, the moisture absorption / release performance in the middle humidity region, the crushing strength, and the water disintegration resistance were measured. The test method is as follows.
[Moisture absorption and moisture release]
The granulated humidity-conditioning material compact is allowed to reach moisture equilibrium (after confirming that it is within ± 0.1 g / d) in an environment of a temperature of 23 ° C. and a humidity of 53% RH, and the temperature is kept at the same 23 ° C. The change in weight was recorded under the condition of 75% RH × 24 hours (high humidity) −53% RH × 24 hours (low humidity). Table 2 shows the moisture absorption and moisture release.
[Crushing strength]
Uses a Kiya hardness tester.
[Water disintegration resistance]
The granulated molded body was immersed in 10 grains of water and allowed to stand overnight. When the number of disintegrated parts was zero, the case of ◯, the case of 1 piece, and the case of 2 pieces or more were evaluated as x. The crushing strength and water disintegration resistance are shown in Table 3 together with the weight.

Table 2

Table 3

Claims (7)

As a humidity control component, 50 to 70 parts by weight of calcium silicate material powder and 5 to 15 parts by weight of carbonaceous material powder are blended, and as a binder , slaked lime or slaked lime and bentonite (in the case of combined use) A molded article for humidity control formed by adding 15 to 25 parts by weight in a total amount) and forming into an appropriate shape. As a humectant component, 50 to 70 parts by weight of calcium silicate material powder, 5 to 15 parts by weight of carbonaceous material powder, and 15 parts by weight or less of kaolin clay mineral powder are blended and used as a binder. , Slaked lime or slaked lime and bentonite (total amount in the case of combined use) 15 to 25 parts by weight are added and molded into a suitable shape. The molded body for humidity control according to claim 1 or 2, wherein a tobermorite compound or a lightweight cellular concrete cutting powder is used as the calcium silicate material. The tempered molded article according to claim 1 or 2, wherein one or more selected from activated carbon, lignite coke, charcoal and bamboo charcoal are used as the carbonaceous material. The shaped article for tempering according to claim 1 or 2, wherein a clay mineral mainly composed of halloysite is used as the kaolin clay mineral. The molded body for humidity control according to claim 1 or 2, which is formed into a substantially spherical shape having a diameter of 1 to 30 mm. A method for producing a humidity control molded body according to any one of claims 1 to 6 , comprising 50 to 70 parts by weight of calcium silicate material powder, 5 to 15 parts by weight of carbonaceous material powder, and kaolin clay mineral 0-15 parts by weight of powder and 15-25 parts by weight of slaked lime or slaked lime and bentonite (total amount in the case of combined use) and granulated with water, dried, and moisture content A method for producing a molded article for humidity control, comprising adjusting the content to 5% by weight or less.