JPH0638844B2 - Deodorizing composition liquid and method of using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a deodorizing composition liquid used for deodorizing or maintaining the freshness of a particular fresh food and a method for using the same.

(Prior Art) Conventionally, activated carbon has been used in various fields as a deodorant.

(Problems to be solved by the invention) However, since conventional activated carbon is used in the form of powder or granule as it is, it is easily scattered unless it is enclosed in a breathable container. There is a limitation in processing that it cannot be put to practical use, and therefore, the form of use for deodorization is significantly limited.

Therefore, the invention of the present application aims to develop a novel dosage form of activated carbon that is not subject to the above-mentioned processing restrictions and an effective usage form of activated carbon that is possible based on such a dosage form. It is a technical issue to be solved.

(Means for Solving Problems) Technical means for solving the above problems are as follows: (1) As a novel dosage form, powdered activated carbon, a dispersant and a thickener are mixed with water. To provide a deodorizing composition liquid as a colloidal solution (first invention of the present application), and (2) as a utilization form thereof, a colloidal solution prepared by mixing powdered activated carbon, a dispersant and a thickener with water. It is to provide a method for using the deodorizing composition liquid as the deodorizing composition liquid for an air cleaner (the second invention of the present application).

In the first invention and the second invention, the type of activated carbon may be organic or inorganic, but it is desirable to use, for example, good quality coal or coconut shell charcoal as a raw material. Although the particle size of the activated carbon is not limited, it is desirable that the particle size distribution is such that particles of 350 mesh or less occupy 80% or more. And, in the activated carbon test method specified in JIS K-1474, the iodine adsorption amount is 1,150 mg / g or more, the decolorizing power of methylene blue is 400 mg / g or more, and the benzene adsorption amount is 49%.
It is preferable to use high-performance activated carbon having the above value, but one having lower performance may be used.

Next, the dispersant means, as far as the first invention and the second invention are concerned, those having a particularly low foaming power and a low degreasing property among the substance groups which prevent the aggregation of the colloidal particles. Therefore, those having a large foaming power or degreasing property, such as commercially available soap and solid, powdery or liquid detergents are excluded. Specific examples of such a dispersant include butyl naphthalene sulfonate sodium, naphthalene sulfonate sodium / formalin condensate,
Dioctyl sulfosuccinate, Sodium lignin sulfonate / derivative, Polyoxyethylene lauryl ether,
Examples thereof include polycarboxylic acid type polymer dispersants, and these are used alone or in combination of two or more kinds. The dispersant is used alone or in combination with a thickener described later.

As the thickener, a polymer substance capable of forming a hydrophilic so-called protective colloid, such as gelatin, carboxymethyl cellulose, sodium polyacrylate, sodium alginate, polyvinyl alcohol, etc., is used alone,
Alternatively, two or more kinds are used together.

Next, the deodorizing composition liquid, the mixing ratio of water, activated carbon, dispersant and thickener in the deodorizing liquid may vary depending on the purpose of use, and therefore cannot be uniformly limited. However, as a rough guide, 100 parts by weight of activated carbon for any amount of water,
It is desirable to add 0.5 to 50 parts by weight of a dispersant and 0.1 to 25 parts by weight of a thickener.

In adjusting the deodorizing composition liquid, a stock solution intentionally containing only a small proportion of water was prepared in advance, and water was added to the stock solution at the time of use to obtain a deodorizing composition solution having a concentration according to the purpose of use. It may be adjusted.

In the above-mentioned second invention, a so-called scrubber is typical as the air cleaner. This scrubber includes known types such as a drainage type, a pressurized water type, a venturi scrubber, a jet scrubber, and a Taizen washer. In addition to the scrubber, all types of systems in which air is brought into contact with a deodorizing liquid to clean the deodorizing liquid are also included.

(Operation) In the deodorizing composition liquid, particles of activated carbon are prevented from aggregating with each other due to adhesion of the dispersant around the particles. In addition, the polymer thickener wraps the particles of activated carbon to enhance the above-mentioned action, and also has an action of preventing settling of the activated carbon particles. As a result of these effects, the particles of activated carbon maintain a stable and uniform dispersed state in the deodorizing composition liquid.

Since the dispersant and the thickener have a small foaming power, when the mixing operation for adjusting the deodorizing composition liquid is used, or when the deodorizing liquid is used in an air cleaner, a harmful effect caused by foaming, for example, the surface of the foam It is possible to prevent particles of the activated carbon from aggregating and floating and deteriorating the dispersed state thereof, and preventing the contact between the deodorizing liquid and air from being caused by the presence of bubbles.

The deodorizing composition liquid of the first invention is used as a stock solution of the deodorizing liquid of the second invention, and the deodorizing composition liquid itself has various uses as a liquid deodorizing agent. Paper, cloth, cotton. After coating or impregnating various packaging materials such as wood and inorganic materials, building materials, etc., it is desirable to dry them and to deodorize them, such as food packaging materials and wall paints containing volatile substances. It can also be used as a wall material used together or as a base material thereof.

Activated carbon is a metabolite of plants and absorbs ethylene, which promotes ripening of fruits, and oxygen necessary for plant respiration, and is therefore used for deodorization as a material for packaging fresh fruits in a relatively airtight state. When the composition liquid is attached, it also has an action of preventing ripening of fresh fruits and the like (in other words, deterioration of freshness).

In the second aspect of the invention, the colloidal particles do not cause aggregation or settling, so that the colloidal particles efficiently come into contact with the air containing the odorous component.

(Example) Next, an example of the present invention will be described.

First, the components listed below were mixed with 60 parts by weight of water.

Activated carbon: 24 parts by weight This activated carbon is made of coconut shell charcoal as a raw material and used in the form of fine powder in which particles of 350 mesh or less account for 80% or more.

β-Naphthalenesulfonic acid soda / formalin condensate: 5 parts by weight Carboxymethyl cellulose: 1 part by weight Then, the mixed liquid was stirred to obtain a deodorizing composition liquid of the first invention in a state where activated carbon was uniformly dispersed. Even when the above stirring operation was performed comparatively vigorously, there was little foaming and the foam disappeared quickly. The dispersed state of activated carbon in the deodorizing composition liquid was remarkably stable.

Next, this deodorizing composition liquid was diluted 2.5 times with water to obtain the deodorizing liquid of the second invention.

In order to see the deodorizing effect of this deodorizing solution, a deodorizing test conducted by injecting 100 deodorizing solutions into a deodorizing booth will be described below.

300-500pp generated in the coating process of lacquer paint
Hazardous thinner gas with m concentration (odorous component is butyl acetate 30
%, Ethanol 10%, toluene 60%. ) Was treated in a deodorization booth, 99.5% of the odorous components were adsorbed and removed.

200-500 generated in the process of processing phenolic resin
After processing phenol gas of ppm concentration in the deodorizing booth, 9
7.5% of phenol was adsorbed and removed.

(Effect of the Invention) According to the first invention of the present application, restrictions on processing of activated carbon are reduced, and it is possible to use the activated carbon in various forms as a deodorizing material or a freshness maintaining material.

According to the second invention of the present application, the deodorizing liquid having a high deodorizing ability can be obtained by preventing the activated carbon in the deodorizing liquid in the air cleaner from aggregating or settling.

Claims (2)

[Claims] 1. A deodorizing composition liquid comprising a powdered activated carbon, a dispersant and a thickener mixed in water to form a colloidal solution. 2. A deodorizing composition, characterized in that a deodorizing composition liquid obtained by mixing powdered activated carbon, a dispersant and a thickener into water to form a colloidal solution is used as a deodorizing liquid for an air purifier. How to use the liquid.