JP2016068543A5 - - Google Patents

Description

However, it is necessary to irradiate the photocatalyst with ultraviolet rays in order to generate holes that generate hydroxy radicals from the photocatalyst in a room that is not exposed to sunlight. For example, in an environment where light does not reach such as a sanitary mask, the catalytic function is not exhibited. There is a problem. In addition, in the case of a catalyst that operates with visible light for illumination instead of the ultraviolet rays of sunlight, the generated holes are often lost by recombining with the electrons that have been excited and moved. There is also a problem that the cost is increased because it is necessary to blend a precious metal such as. Under these circumstances, there is a demand for a material carrying a catalyst that retains holes and functions even in the absence of light.

The present inventor has further conducted detailed studies on the means disclosed in Patent Document 2 including the existence of holes by means of electron spin resonance and antiviral properties. As a result, the substrate-silica sol dried product composite obtained by applying silica sol to the substrate and drying it at an ambient temperature of 4 ° C. to 150 ° C., preferably 4 ° C. to 50 ° C. retains holes even in the absence of light. Thus, the present invention has been completed by knowing that hydroxyl radicals are generated when it comes into contact with moisture.

In the above inventions, dry atmosphere temperature after application of the silica sol to the substrate, 4 to 150 DEG ° C., particularly preferably in the range of 4 to 50 ° C..

In each of the above inventions, the substrate can be either a woven fabric or a nonwoven fabric, or a composite thereof.

When selecting a woven fabric or a non- woven fabric as the base material , the amount of silica attached to the base material is 0.1-2 per mass (g · m ² ) per unit surface area of the base material in a dry state. Desirably, the range is 1 g. In the above case, it is desirable that the drying atmosphere temperature after the application of the silica sol is 4 to 50 ° C.

Each invention is to generate hydroxyl radicals upon contact with water, further characterized by exhibiting a virus inactivating effect even under no light.

The base material-silica sol dried composite is a mass per unit mass (g / m) per unit surface area of the base material in a dry state of a treatment liquid containing 1% to 40% silica. ² ) And then dried at an ambient temperature of 4 to 150 ° C. to produce the load.

The substrate-silica sol dried product composite is preferably applied to a mask. In this case, first, the mask shall have the dried base silica sol composite according to any of the previous inventions, at least for the breath passage portion of the members constituting the mask. Can do.

Although the mask has various types, particularly is preferable to mask and gauze mask, a nonwoven fabric base material is cotton system, and a dry atmosphere temperature to produce a four to one hundred fifty ° C. substrate - silica sol The dried product complex may be attached to the breath permeable portion .

The base material-silica sol dried composite is made into a woven or non-woven base material, and is incorporated into at least one of or both the exhaust side and the intake side of members constituting the air treatment device to constitute the air treatment device. Can do.

Here, as a base material when applied to the base material-silica sol dried product composite, there is no particular limitation, for example, a woven fabric or a non-woven fabric made of natural fibers or synthetic fibers that decompose at a relatively low temperature is used. Is possible.

The silica sol solution used in the present invention includes those using water as a dispersion medium and those using an organic solvent as a dispersion medium, both of which can be used. The concentration is preferably about 1 to 40% by mass ratio. If the concentration is too low, the amount of silica sol solution required to obtain the necessary dry product or substrate-silica sol dry product increases, leading to a decrease in production efficiency. On the other hand, when the concentration is too high, the amount of adhesion cannot be controlled within an appropriate range, and problems such as difficulty in ensuring the air permeability of the base material- silica sol dry matter composite occur.

The drying temperature is also important. When the drying atmosphere temperature is higher than 150 ° C., the specific effects of the present invention are hardly expressed. Conversely, when the temperature is lower than 4 ° C., the silica sol is easily frozen or gelled, so that the object of the present invention cannot be achieved. The appropriate drying atmosphere temperature is influenced by the concentration of the silica sol and the ventilation conditions during drying, but is generally 4 ° C. or higher and 150 ° C. or lower, preferably 4 ° C. or higher and 50 ° C. or lower.

The silica sol-dried material composite sheet (9 cm × 9) prepared in Example 3 was placed on the gauze overlapping part of a commercially available gauze mask (trade name: soft cotton gauze mask, cotton gauze 6 layers, size 135 × 95 mm, manufactured by Daiso Sangyo Co., Ltd.). 9 cm) were sandwiched one by one to obtain an antiviral gauze mask. With this antiviral gauze mask, the decrease in virus titer is log 4.8, that is, 1,99.98% of the original virus can be reduced by 1,99.98%.

Claims (10)

A base material composed of a woven fabric or a non-woven fabric, and a silica sol having a particle size of 4 nm to 0.7 μm coated on the base material, and then dried at an atmospheric temperature of 4 to 150 ° C. to hold holes. Substrate-silica sol dried product composite. The base material-silica sol dried product composite according to claim 1 , wherein the silica particles have a particle size of 8 to 20 nm. The substrate-silica sol dried product composite according to claim 1 , wherein a drying atmosphere temperature after coating is 4 to 50 ° C. 3. When the substrate is a woven fabric or a nonwoven fabric, the amount of silica sol attached to the substrate is 0.1 to 2.1 g per mass (g / m ² ) per unit surface area of the substrate in a dry state. The substrate-silica sol dried product composite according to claim 1, which is in a range. Substrate - silica sol dry matrix composite, the substrate of claim 1-4, wherein the generating hydroxyl radicals upon contact with water - sol dried matrix composite. The substrate-silica sol dried product complex according to any one of claims 1 to 5 , which exhibits a virus inactivating action in the absence of light. Of the components included in the mask, at least expiratory transmission portion substrate according to any one of claims 1 to 6 - a mask, characterized in that it is constituted by silica sol dry matrix composite. Body is gauze mask, claim 1 substrate 6 according to the expiratory transmissive portion - mask formed by mounting a silica sol dry matrix composite. The base material-silica sol dry matter composite according to any one of claims 1 to 6 , wherein the base material is a woven fabric or a non-woven fabric at least on one or both of the exhaust side and the intake side among members constituting the air treatment device. An air treatment device mounted as an air filter element. The amount of silica sol treatment liquid containing 1% or more and 40% or less of silica in a mass ratio is 0.1% per mass (g / m ² ) per unit surface area of the substrate in a dry state. after application to so that such a range of ～2.1G, substrate and wherein the drying at ambient temperature for 4 to 150 DEG ° C. - method for producing silica sol dry matrix composite.