JP3243866B2 - Granules of volatile substances - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to particles of volatile substances.

[0002]

2. Description of the Related Art Volatile substances that evaporate over time at room temperature, such as camphor and naphthalene used as insect repellents, lemon oil and rose oil used as fragrances, and the like. Are various. There are various states such as solid, semi-solid, and liquid. Some are positively made into a solution and some are colored.

[0003] Among these, for example, many insecticides in a chest of drawers, indoor fragrances, etc., which are required to volatilize gradually when used, that is, sustained release properties are required. In order to satisfy this sustained release, it is necessary to cover the volatile substance with something. For example, what is wrapped in a gas-permeable paper bag is suspended from a chest or stored in a container that can be adjusted to a small opening amount.

[0004]

In short, a covering such as a paper bag or a container reduces the outside dew area of a volatile substance. However, if not only the outer dew area can be reduced, but also the coating itself can actively hold the volatile substance gas released from the inside and release a part of it, It is expected that the sustained release property will be further improved if the target can be added.

Further, as can be understood from the hypothesis that the package wrapped in the paper bag is accommodated in the container, the multiplexing of the coatings improves the sustained-release property and the content of the container alone is increased. However, it is expected that the handling will be better if the number is more than one. In other words, as long as the container itself has a coating that satisfies the sustained release property and can accommodate a plurality of containers in other containers as needed, it is expected that the container will be more preferable in terms of both performance and handling. Is done.

[0006]

[MEANS FOR SOLVING THE PROBLEMS] The coating of the volatile substance is powdered.
Sintering composed of body activated carbon and carbonized skeleton of organic matter
Use a shape . The overall shape is granular. That is, the present invention relates to a firing method comprising a volatile substance which volatilizes with time at normal temperature, a powdered activated carbon covering the substance, and a carbonized skeleton of an organic substance.
The gist of the present invention is a particle of a volatile substance formed of a compact .

Examples of volatile substances include camphor, naphthalene, paradichlorobenzene, benzoic acid, dimethyl fumarate, adamantane, cyclododecane, peppermint oil, peppermint oil, eucalyptus oil, turpentine oil, cedar-wood. Oil, hinoki oil, lavender oil, rose oil, lemon oil, lime oil, cinnamon oil, α-pinene, camphene, anis alcohol, menthol, benzyl alcohol, anisaldehyde, carvone, jasmon, benzoic Ethyl acid,
Examples include ethyl acetate, anilyl, safrole, ambrettolide, hydroquinone dimethyl ether, anisic acid, phenylacetic acid, green tea extract, and wood vinegar. These may be used alone or in combination as a whole or in part as appropriate, depending on the application such as insecticide, fungicide, pharmaceutical agent, fragrance, deodorant, rust inhibitor, fungicide. One example is a substance obtained by adding a fragrance to a sublimable substance, or a substance obtained by dissolving a fragrance in a mineral wax such as paraffin wax or microwax as a main component.

[0008] Powdered activated carbon, which is one component of the fired molded body, includes rice hulls, rice straw, peanut hulls, walnut shells, pods, coconut shells, wood, coal, sawdust, Various synthetic resins, industrial wastes, or those manufactured by appropriate manufacturing methods from appropriate raw materials such as carbon precursors thereof can be used. The size of the powder can also be appropriately selected according to the size of the granular material, for example, 1 mm or 10 mm, or according to the sustained release property to be exerted. It is also appropriate in terms of a shape such as a completely amorphous shape or a fibrous shape. Rather, it can be said that it is practical to select a relatively inexpensive one among various commercially available ones. In addition, the present inventor has proposed that this powdery activated carbon is capable of adsorbing and holding the volatile substance by the gas adsorption ability while reducing the external exposure area of the volatile substance due to the presence of the coating by the fired molded body. We speculate that it forms a "sphere" of volatile substances on the surface of the body as a whole, and acts to release some volatile substances from this "sphere".

[0009] The other component forming the fired body, organic
The carbonized skeleton of the product is, for example, polyvinyl chloride, polyacetic acid
Vinyl, polyvinylidene chloride, polyvinyl alcohol,
Furan resin, initial condensate of thermosetting resin, pitch, tar
Or polyethylene, polypropylene, polystyrene, etc.
Of nylon, nylon, polyvinyl chloride, polyvinyl acetate, etc.
It is obtained by firing the particles. Departure
In the case of Ming, powdered activated carbon and carbonized bone
A fired molded body composed of a case is used.
Compared to the case where powder is directly attached, the phase
The target thickness is large.

One preferred example is that the binder is fired.
Having open and communicating pores (passages for volatile substances)
It is a fired molded body that has become an elementary skeleton. This fired molded body
Is, for example, polyvinyl chloride, polyvinyl acetate, poly salt
Vinylidene chloride, polyvinyl alcohol, furan resin, heat
Proper condensate of curable resin, pitch, tar, etc.
Use one or a combination of multiple binders to
Agents, etc., if necessary, and mixed with powdered activated carbon.
Kneading or baking treatment, or polyethylene,
Polypropylene, polystyrene, nylon, polyvinyl chloride
Prepare a particulate matter such as
Powdered activated carbon is placed, and the ratio is about 1 to 10%.
Setting the atmosphere appropriately so that the carbon yield is relatively small
It can be obtained by performing a pretreatment. Here, during the manufacturing process
In the latter case, the particulate matter once melts and has fluidity
This penetrates into the gap between the powdered activated carbons,
As a result, powdered activated carbon adheres one after another,
It is assumed that a hollow body is formed by forming a skeleton
Although relatively small particles with a particle size of up to several mm
Suitable for body. Easy to manufacture in process
Not only, but also the composition ratio of powdered activated carbon in the sintered compact
The higher the outside, the better the function of activated carbon
What can be demonstrated is easily obtained.

[0011] The volatile substance is a fired molded body coated body.
Will be accommodated later. Liquid, some
Or, the general method is to impregnate liquefied material.
However, if there is concern about leakage after containment,
The active substance may be gelled. For gelation
Are gelatin, agar, sodium alginate, polyvinyl alcohol
Alcohol, carrageenan, gum arabic, carboxyme
Chill cellulose or the like can be used. Gelation only on the surface
It is used in the production of artificial salmon roe,
Interfacial polymerization, insolubilization, phase separation, interfacial precipitation, etc.
Microencapsulation methods can be used.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given based on a production example.

<Example 1> (1) Preparation of coated body (hollow fired molded body) Flow beads CL-12007 (spherical polyethylene manufactured by Sumitomo Seika Co., Ltd .: particle size range: 900 to 1100 µm)
Is placed in Kurare-coll PK100 (pulverized activated carbon manufactured by Kuraray Chemical Co., Ltd .: particle size: 100 mesh or less), and then raised in the air from room temperature to 300 ° C. at a rate of about 1 ° C./min. After being heated and subjected to an infusibilization treatment at 300 ° C. for 1 hour, a baking treatment was performed in a nitrogen atmosphere at 600 ° C. for 1 hour. After the heat treatment, excess activated carbon powder was removed by sieving. The obtained one has a diameter of about 1000-1
The thickness as 200 μm was about 50 μm as a coating.

(2) Containing volatile substances The coated body prepared in (1) is immersed in a 2% aqueous agar-aqueous solution to which menthol is added, and the solution is sufficiently contained in the hollow portion. It was taken out from the inside, the adhering liquid on the surface was wiped off, and the solution was cooled to gel the contained solution.

Example 2 The coated body prepared in (1) of Example 1 was immersed in a hot melt of naphthalene to sufficiently contain naphthalene in a hollow portion, and then taken out of the solution to obtain a surface. Was wiped off and allowed to cool to solidify the contained naphthalene.

Example 3 The coated body prepared in (1) of Example 1 was placed in a heated melt of Mitsui High Wax 110 (low-density polyethylene wax manufactured by Mitsui Oil Co., Ltd.) to which Hinoki oil was added. Soak,
After the melt was sufficiently contained in the hollow portion, the melt was taken out of the melt, the adhering liquid on the surface was wiped off, and the melt was solidified by cooling.

Example 4 The coated body prepared in (1) of Example 1 was immersed in a 0.5% aqueous sodium alginate solution to which peppermint oil had been added, so that the solution was sufficiently contained in the hollow portion. After that, remove it from the solution, wipe off the adhering liquid on the surface, and
It was immersed in an aqueous calcium chloride solution to cause gelation, taken out of the solution, and wiped off the adhered liquid on the surface.

<Embodiment 5> In place of flow beads CL-12007, flow beads C are used.
L-5007 (Spherical polyethylene manufactured by Sumitomo Seika Co., Ltd .: particle size range: 300 to 400 μm)
All operations were the same as in Example 1.

<Embodiment 6> A Diasorb F200 is used instead of the Kuraray PK100.
(Mitsubishi Kasei Co., Ltd. powdered activated carbon: particle size; 200 mesh or less) Except for using, all were the same as in Example 1.

[0020]

According to the present invention, the volatile substance exists in a sufficient amount inside the coating , is sufficiently retained in the powdered activated carbon which is a part of the coating, and is gradually released. It is excellent in release properties, and has very good handling properties, and can be very easily stored in another closed container or used in a storage container.

Claims (3)

(57) [Claims] 1. A volatile substance which volatilizes over time at normal temperature;
Consists of powdered activated carbon covering this and carbonized skeleton of organic matter
Granules of a volatile substance comprising a fired molded body. Wherein said volatile substance is granules of volatile substances according to claim 1, wherein at least the surface of that is gelled. 3. The method of claim 1, wherein the powdered activated carbon in the fired compact is
The feature is that the higher the outside ratio, the higher the composition ratio
The volatile material particles according to claim 1 or 2.