JP6877323B2 - Additives for interior materials and plaster - Google Patents

Description

The present invention relates to an additive for an interior material and a plaster, a water-based adhesive and a water-based coating agent using the same.

As part of the new housing policy in the future, compliance with energy saving standards in each region will be mandatory in 2020, and it is said that by 2030, we aim to realize a net zero energy house on average for new housing. ing. Therefore, houses are required to improve heat insulation, improve airtightness, improve energy-saving equipment, and the like, to improve the heat insulation standard or higher.

On the other hand, it is important to take measures against sick house syndrome in housing. Part of the cause of sick building syndrome is considered to be volatile organic compounds such as formaldehyde and VOC (toluene, xylene, etc.) emitted from building materials, furniture, daily necessities, and the like. These organic compounds are used in plywood, heat insulating materials, vinyl cloth, coating materials, new building materials, etc. in houses, and in energy-saving houses with good heat insulating performance and airtightness, the degree of sealing of the house tends to be high. Sick house syndrome measures will be more important than ever.

The current measures for sick house syndrome are that formaldehyde is restricted to the building materials used for interior finishing by the Building Standards Law, and that the air in the living room volume of the house is ventilated 0.5 times or more per hour by a 24-hour ventilation system. Ventilation is obligatory, and measures are required to prevent formaldehyde from flowing into the living room from behind the ceiling. As for the building materials used for the above interior finish, it is standard to use a material having a formaldehyde concentration of 0.08 ppm or less, which is labeled as F ☆☆☆☆ (Forster), for JIS products.

However, the Building Standards Law does not limit chemical substances other than the above-mentioned formaldehyde and termite extermination agent chlorpyrifos. In addition, the amount of organic compounds volatilized from furniture may be large. Especially during the period not so long since the new construction. It is possible that the amount of organic compounds volatilized from building materials and furniture is large, and measures for sick house syndrome that exceed the standards stipulated by law are desired.

One of the measures against sick house is titanium oxide-based photocatalyst material that coats the window glass, and it is said that it coats the glass inside the house and catalyzes it with ultraviolet rays passing through the window to decompose the chemical substances inside the house. However, since it is limited to window glass, it may be difficult to sufficiently decompose chemical substances in every corner of the room. In addition, the function may deteriorate at night or in winter when the irradiation angle of sunlight is low and the amount of ultraviolet rays is small, and the price is not cheap.

There is a method of decomposing and removing an organic compound by applying titanium dioxide as a main catalyst of platinum and a photocatalytic substance as an auxiliary catalyst to a substrate together with a binder (Patent Document 1). However, the method described in Patent Document 1 is extremely expensive because it uses platinum as the main catalyst.

Patent No. 4858857

The present invention advantageously solves the above-mentioned problems, and uses an interior material additive capable of decomposing and reducing volatile organic compounds as a countermeasure against sick house syndrome, and the interior material additive. It is an object of the present invention to provide plaster, water-based adhesive and water-based coating agent.

As a result of intensive research for measures against sick house, the present inventors include at least one selected from pyroelectric powder and piezoelectric powder and at least one selected from metal complex, metal powder and metal ion. And came to the present invention.

The interior material additive of the present invention based on the above findings is an interior material additive added to plaster, which contains tourmaline powder and cupric tartrate water, and is subjected to air circulation energy or temperature change. It is characterized by decomposing formaldehyde.

The plaster of the present invention contains tourmaline powder and cupric tartrate water, and is characterized by containing an additive for an interior material, which is characterized by decomposing formaldehyde by circulating energy of air or a temperature change.

According to the additive for interior materials of the present invention, volatile organic compounds in a living room can be decomposed and reduced, which is advantageous for measures against sick house syndrome.

Hereinafter, the additive for interior materials of the present invention (hereinafter, also referred to as “additive”) and the plaster, water-based adhesive, and water-based coating agent using the same will be specifically described.

[Additives for interior materials]
The additive for interior materials of the present invention contains at least one selected from pyroelectric powder and piezoelectric powder and at least one selected from metal complex, metal powder and metal ion in water.

Stucco is said to be able to adsorb volatile organic compounds, and solid wood is said to be free of volatile organic compounds and have a humidity control effect. Therefore, as current sick house syndrome countermeasure houses, there are houses that use a lot of natural stone walls, plaster, solid wood flooring, etc., and houses that are made of natural materials. It is also considered to use Japanese paper, diatomaceous earth, or natural paint for the interior to adsorb it to Japanese paper or diatomaceous earth, or to take measures against sick house syndrome with natural paint that does not contain volatile organic compounds.

However, even if the interior is finished with natural materials such as plaster, Japanese paper, and diatomaceous earth, the adsorption amount is limited, so the adsorption effect does not last forever, and the volatile organic compounds adsorbed to the adsorption limit are It is also possible that the plaster is released into the living room.

Further, as described above, the photocatalytic material such as titanium oxide may deteriorate in function at night or in winter when the irradiation angle of sunlight is low and the amount of ultraviolet rays is small.

Therefore, the present invention comprises at least one selected from pyroelectric powder and piezoelectric powder as a novel additive capable of decomposing volatile organic compounds without the need for a photocatalyst, and metal complexes, metal powders and metal ions. It was developed as a non-photocatalyst, including at least one selected. The additive of the present invention exerts a catalytic effect to decompose VOC gas and convert it into _{water and CO 2} by, for example, adding it to plaster, coating the surface of plaster, or using it as an adhesive for wallpaper. be able to.

Although the action and effect of the additive for interior materials of the present invention has not always been clarified in principle and theory, it is considered by the inference of the present inventor that it has the following action and effect. At least one selected from the pyroelectric powder and the piezoelectric powder in the additive generates an electric charge due to the circulating energy of air or the temperature change of the living room required for a highly airtight house, and this electric charge is the additive. The pyroelectric powder or piezoelectric powder conducts to at least one selected from the metal complex, metal powder and metal ion contained therein, and holes are formed in the pyroelectric powder or piezoelectric powder to be positively charged, and the pyroelectric powder or piezoelectric material is positively charged. The holes in the powder ^{take electrons from the OH-} ions in the surrounding water to generate OH charges. On the other hand, electrons conducted in at least one selected from metal complexes, metal powders and metal ions react with oxygen in the air to generate superoxides. It is considered that VOC gas can be decomposed by the oxidizing power of these OH radicals and superoxide.

The effect of the present invention is that formaldehyde is introduced into a closed container coated with plaster containing the additive for interior materials of the present invention on the inner surface and the temperature is raised by the experiments of the present inventors as described later. It was confirmed that the formaldehyde concentration decreased and the CO _{2 concentration increased.}

Hereinafter, each component of the additive for interior materials of the present invention will be described.
(Pyroelectric powder and piezoelectric powder)
A pyroelectric body is a substance that receives heat energy to generate an electric charge, and a piezoelectric body is a substance that receives a pressure to generate an electric charge. Pyroelectric bodies are generally included in piezoelectric bodies because they have a piezoelectric effect. Therefore, in the present invention, it is not necessary to strictly distinguish between the pyroelectric body and the piezoelectric body.

Typical examples of the pyroelectric body and the piezoelectric body include barium titanate, lead zirconate titanate, potassium niobate, and sodium bismus sodium titanate, but the materials are not limited to these materials and have piezoelectricity. Anything may be used, and for example, piezoelectric polymer material powder, metal powder, silicon carbide powder, silicon powder, tourmaline, quartz, or the like may be used. In addition, two or more of these materials can be used in combination.

The pyroelectric body and the piezoelectric body are used in the form of powder in the present invention. By making it into a fine powder, the dispersibility in water is improved. The average particle size of the powder can be about 3 μm or less. If the average particle size exceeds about 3 μm, the color of each powder affects the plaster and the coating agent, which is not preferable. The lower limit is not particularly limited, but the manufacturing cost increases as the fineness becomes finer, so that the lower limit can be set to about 0.5 μm or more. In the examples described later, those having an average particle size of 3 μm were used.

In the additive of the present invention, the blending amount of the pyroelectric powder and the piezoelectric powder with respect to water is not particularly limited. The amount of the pyroelectric powder and the piezoelectric powder to be sufficiently dispersed in water and which has the effect of decomposing volatile organic compounds when the additive of the present invention is used as a plaster, an adhesive or a coating agent. Can be done.

(Metal complex, metal powder and metal ion)
Electric charges generated from the pyroelectric body and the piezoelectric body are transmitted to the metal complex, the metal powder, and the metal ion to generate holes in the pyroelectric body and the piezoelectric body. Further, in the metal powder, the electric charge received from the pyroelectric body or the piezoelectric body reacts with oxygen in the air to generate a super oxide.

Examples of the metal complex, the metal powder and the metal ion include a copper complex, a copper powder or a copper ion. Copper has good conductivity and has an antibacterial effect. Therefore, by including the metal complex, copper powder or copper ion in the additive of the present invention, not only the above-mentioned effect of generating holes but also mold is generated in the glue as an adhesive for wallpaper and vinyl cloth. Has the effect of being able to prevent. Therefore, it is useful for improving the health of the resident of the house by using the interior material containing the additive for the interior material of the present invention. Further, the material of the metal complex, copper powder or copper ion is cheaper than that of platinum or the like. In addition, a plurality of metal complexes, copper powders and copper ions can be included in the additives of the present invention. Examples of the water containing the metal complex include cupric tartrate water.

In the additive of the present invention, the blending amount of the metal complex, the metal powder and the metal ion with respect to water is not particularly limited. It can be appropriately determined according to the amounts of the pyroelectric powder and the piezoelectric powder described above.

(Other ingredients)
The additive of the present invention may contain at least one selected from the above-mentioned pyroelectric powder and piezoelectric powder, and at least one component selected from metal complexes, metal powders and metal ions. For example, a retainer or a dispersant for uniformly holding the piezoelectric element in water can be included. As the retainer or dispersant, for example, zeolite, silicon oxide or the like can be used. Further, depending on the application, a binder, an adhesive, or the like can be included in the additive of the present invention.

[Production method]
The additive of the present invention can be produced by incorporating each of the above-mentioned components in water.

[Stucco, water-based adhesive, water-based coating agent]
Next, the use of the additive for interior materials of the present invention will be described. The additive of the present invention can be added to, for example, an aqueous coating agent applied to the surface of plaster of an interior material or the surface of wallpaper. Further, it can be used as an additive added to the plaster raw material together with water or in place of water when the plaster wall is produced. Further, for example, it can be added to an adhesive for adhering wallpaper or vinyl cloth.

The plaster, adhesive, and water-based coating agent to which the additive of the present invention is added are composed of at least one selected from the components of the additive of the present invention, particularly an electric body powder and a piezoelectric powder, and a metal complex, a metal powder, and a metal ion. Includes at least one selected from.

By including at least one selected from the pyroelectric powder and the piezoelectric powder and at least one selected from the metal complex, the metal powder and the metal ion, the plaster can be volatile from the surface of the plaster wall of the interior to the living room, for example. It is possible to decompose the organic compounds of the above, and it is possible to decompose the volatile organic compounds once absorbed by the plaster. In addition, the water-based adhesive can decompose volatile organic compounds in the living room, for example, through a breathable wallpaper or vinyl cloth, and in particular, the additive of the present invention contains a copper complex, copper powder or copper ion. In some cases, it is possible to prevent the water-based adhesive from forming mold. Furthermore, the coating agent applied to the surface of wallpaper or vinyl cloth can decompose volatile organic compounds in the living room.

The blending amount of the interior additive of the present invention when added to plaster, water-based adhesive or water-based coating agent can be appropriately determined according to these uses. In one example, considering the decomposing effect of volatile organic compounds, the blending amount is about 1 g to 3 g per square meter when the pyroelectric powder and the piezoelectric powder are applied to the surface of wallpaper or plaster. can do.

An additive for an interior material containing 100 g of tourmaline powder in 1000 cc of cupric tartrate water (800 ppm) was prepared. ^{630 cm 3} of this additive for interior materials was added to 500 g of commercially available ready-mixed plaster powder and kneaded to obtain a plaster paint.

This plaster paint was applied twice to each of six 30 cm square refractory boards and dried. The dried refractory board was attached to each of the six inner surfaces of a hollow rectangular parallelepiped closed container and fixed to prepare a specimen.

A formalin container with an open lid was placed inside the specimen, and the closed container of the specimen was sealed. Then, it was heated to bring the temperature inside the specimen to 40 ° C. The formaldehyde concentration and carbon dioxide concentration in the specimen were measured every 3 hours while maintaining the temperature of 40 ° C. using a Kitagawa gas detector.

As a result, the initial value of formaldehyde concentration was 30 ppm, 10 ppm after 3 hours, 5 ppm after 6 hours, and a trace amount after 9 hours.
The initial value of carbon dioxide concentration was 1000 ppm, 1400 ppm after 3 hours, 1600 ppm after 6 hours, and 2000 ppm after 9 hours.
After stopping the heating of the specimen and leaving it for 10 days, the formaldehyde concentration was 0 ppm and the carbon dioxide concentration was 500 ppm.

From the above results, it was found that the carbon dioxide concentration increases as the formaldehyde decreases. It is considered that this is because the formaldehyde absorbed by the plaster was decomposed by the additive for the interior material.

The interior material additive of the present invention has been described above based on the embodiment thereof, but the interior material additive of the present invention is not limited to the embodiments and examples, and is not deviated from the gist of the present invention. , It is possible to make many deformations.

Claims (2)

An interior material additive added to plaster, which contains tourmaline powder and cupric tartrate water, and is characterized by decomposing formaldehyde by circulating energy of air or temperature change. .. Stucco containing tourmaline powder and cupric tartrate water, and containing an additive for interior materials, which is characterized by decomposing formaldehyde by circulating energy of air or temperature change.