JPH08205744A - Heating and transpiring of chemical - Google Patents

Abstract

PURPOSE: To provide a method for heating and transpiring a chemical capable of stabilizing the transpirating amount from a chemical solution and transpiring the chemical in high safety and in economic efficiency without causing leakage of the chemical solution by absorbing the chemical solution in a solution absorbing core having a solution absorbing layer composed of yarn and a coating layer composed of a specific yarn braided material, heating the solution absorbing core and transpiring the chemical. CONSTITUTION: A solution absorbing core has a solution absorbing layer composed of yarn in the center of the core and a coating layer composed of a yarn braided material. The yarn braided material is coated with silicone varnish obtained by further blending base varnish consisting essentially of a silicone polymer and silica with an inorganic filler which is amorphous particles having 0.1-20μm average particle diameter and contains at least needle-like particles having >=5 aspect ratio on the average and at least spherical particles. The yarn absorbing layer is stuck to the yarn braided material with the silicone varnish to give the solution absorbing core. A solution containing a chemical is absorbed on the core and the solution absorbing core is heated to transpire the chemical.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating and evaporating chemicals using a specific absorbent core.

[0002]

2. Description of the Related Art Conventionally, (1) so-called mosquito coils and (2) electric mosquito mats have been favored as a method for heating and evaporating a drug for the purpose of killing insects and the like. Recently, a method of immersing a porous absorbent core in a drug solution and heating the upper part of the core to heat and evaporate the drug (hereinafter, referred to as a liquid system) does not require replacement of a mat or the like each time. It has been regained attention because of its long-term effect stabilization. This method has been known for quite a long time, and for example, Jitsuko Sho 43-2.
Although the method of directly heating the absorbent core is described in Japanese Patent No. 5081, the method of indirect heating generally tends to be adopted because the drug is rapidly decomposed in the case of direct heating. As an indirect heating method, a method in which a felt or the like is interposed between a liquid-wicking core and a heating element to heat is described in JP-B-36-12459 and JP-B-46-22585, and the liquid-core is also used. A method of heating the heating element and the heating element separately from each other at a constant interval is disclosed in Japanese Utility Model Publication No. 43-26274
JP-B-44-8361, JP-B-45-14913
Japanese Patent Publication No. 45-29244. However, the advantages of the mosquito coil incense and the mosquito coil mat were not recognized in the products at that time, and they ended up not being accepted in the market. Recently, this liquid type mosquito repellent has been re-recognized as the technological progress of the heating element, the development of effective insecticidal components in a small amount, and the effectiveness, as well as the changes in living consciousness and living environment accompanying the improvement of life. It is thought that this is due to the improvement in the quality of raw materials for chemicals, including their components, and the progress in plastic processing technology. Now, as the porous liquid absorbent core used in these liquid heating evaporation devices, the felt was used as it was in the past, but in the case of felt, the liquid absorption amount is generally too large, and the storage and transportation are performed. There is a problem that the chemical solution overflows through the core during use, or it is difficult to set the core correctly due to its flexibility. On the other hand, a liquid-absorbent core formed by fixing and molding an inorganic powder or an inorganic powder and wood powder with a water-soluble sizing agent is disclosed in JP-B-61-21633 and JP-B-59-
40409, JP-A-63-24841, JP-A-63-63330, and JP-A-63-74440.
Japanese Patent Laid-Open No. 1-296933, Japanese Patent Laid-Open No. 2-3
These are disclosed in Japanese Patent Publication No. 9841 and Japanese Unexamined Patent Publication No. 2-174628, and at present, many products using this type of absorbent core are available on the market. However, these conventional liquid absorbent cores often undergo chemical decomposition of the chemical liquid due to the surface activity of the inorganic powder, or are broken by mechanical stress or impact, or chipped, and further kneaded during production, There have been problems such as extrusion, drying processes, deformation due to variations in raw material powder, cracking, generation of mold, and variations in performance. Furthermore, these absorbent cores contain starch, C
Organic water-soluble sizing agents such as MC-Na are often used because they are advantageous in production, but even in this case, when the chemical solution is an aqueous solution, it is natural that the sizing agent dissolves, dissolves, and swells to absorb liquid. There was a problem that it could not be used because the core was physically deteriorated. On the other hand, JP-A-3-72833
The publication discloses a liquid absorbent core having a structure having a porous liquid absorbent layer in the center and a holding material layer in the periphery. As this type of absorbent core, for example, the central absorbent layer is a fiber aggregate of polyester, nylon, cotton, glass, etc., and the holding material layer is a tube made of polyester, nylon, glass fiber, etc. treated with varnish. An example is a liquid absorbent core, a so-called fiber core. This fiber core is characterized in that it does not cause mechanical breakage or chipping such as a liquid-absorbent core formed by fixing and molding the inorganic powder or the like with a water-soluble sizing agent, and is easy to manufacture, and the liquid chemical It can be used even if it is an aqueous solution.

[0003]

However, in the case of the fiber core, the amount of the chemical liquid volatilized during use varies depending on the type of varnish used, the coating amount, the baking conditions, etc., and the amount of the chemical liquid volatilized due to deterioration over time. However, there is a problem that the chemical solution exudes due to the decrease in the internal pressure of the chemical solution container due to the temperature change during use or storage. Therefore, an object of the present invention is to provide a method for heating and evaporating a drug by using a liquid-absorbing core in which any stable amount of the drug solution can be volatilized in the fiber core and the drug solution is less exuded by a change in the internal pressure of the drug solution container.

[0004]

In order to solve the above-mentioned problems, a method for heating and evaporating a drug according to the present invention is to absorb a drug solution containing a drug into an absorbent core and heat the absorbent core to evaporate the drug. In the heat evaporation method, the liquid absorbent core has a liquid absorbent layer made of fibers at its center, and a coating layer made of a braid of fibers around the liquid absorbent core, and the fiber braid is a base mainly composed of a silicone polymer and silica. It is characterized in that it is a liquid absorbent core covered with a silicone varnish obtained by further adding an inorganic filler to the varnish, and the fiber absorbent layer and the fiber braid are fixed by the silicone varnish. .

The inorganic filler used in the present invention is in the form of amorphous particles having an average particle size of 0.1 to 20 μm, at least containing acicular particles having an average aspect ratio of 5 or more, and spherical particles. And the like containing at least First, the average particle size is 0.1 to 20
Examples of the amorphous particles having a size of μm include calcium carbonate, magnesia, silica, alumina, aluminum silicate, magnesium silicate, aluminum hydroxide and magnesium hydroxide, and aluminum hydroxide is preferable. The amount of the inorganic filler added is 150 parts by weight or more with respect to 100 parts by weight of the solid content of the base varnish.
It is preferably 0 parts by weight or less. If it is less than 150 parts by weight, an appropriate liquid absorption amount, liquid absorption speed and volatilization amount cannot be obtained,
If it exceeds 700 parts by weight, the work of applying the silicone varnish becomes difficult, which is not preferable. Examples of the particles containing at least acicular particles having an average aspect ratio of 5 or more include magnesium oxysulfate whiskers, potassium titanate whiskers, milled glass fibers and the like. Preferred is magnesium oxysulfate whisker. The addition amount of the inorganic filler is preferably 10 parts by weight or more and 100 parts by weight or less with respect to 100 parts by weight of the solid content of the base varnish. If it is less than 10 parts by weight, an appropriate liquid absorption amount, liquid absorption speed and volatilization amount cannot be obtained, and 1
If it exceeds 100 parts by weight, the work of applying the silicone varnish becomes difficult, which is not preferable. Furthermore, examples of those containing at least spherical particles include spherical silicone polymers, silica balloons, spherical glass bead fine particles, and shirasu balloons. The ratio of the maximum particle size to the minimum particle size of the spherical particles (the maximum particle size / the minimum particle size) is preferably 8 or more. When the particle size ratio is less than 8,
It tends to weaken the action of maintaining an appropriate amount of volatilization. The addition amount of this type of inorganic filler is preferably 20 parts by weight or more and 150 parts by weight or less based on 100 parts by weight of the solid content of the base varnish. If it is less than 20 parts by weight, an appropriate liquid absorption amount,
If the liquid absorption rate and the volatilization amount cannot be obtained and the amount exceeds 150 parts by weight, the work of applying the silicone varnish becomes difficult, which is not preferable. Further, as the inorganic filler, those containing the above-exemplified amorphous particles, acicular particles, and spherical particles can be appropriately combined and used.

As the fiber absorbing layer used in the present invention, aggregates of inorganic fibers such as glass, artificial fibers such as polyester and aliphatic polyamide (hereinafter referred to as "nylon"), heat resistance of 130 ° C or higher Examples thereof include rod-shaped molded products made of rubber or resin, fiber-resin composites such as FRP and felt, and inorganic rod-shaped molded products made of glass, ceramics and the like.

As the fiber braid used in the present invention, a braid of inorganic fibers such as glass and artificial fibers such as polyester and nylon is used, and this braid is composed mainly of a silicone polymer and silica. A silicone varnish obtained by further adding an inorganic filler to the varnish is impregnated and applied, dried and heat-cured to form a coating film of the silicone varnish on the surface. The thickness of the coating film at this time is preferably 50 μm or more.

As the base varnish mainly composed of a silicone polymer and silica, a commercially available silicone varnish for electrical insulation, which is a solution of a silicone rubber or a dispersion type of a solvent, can be used. Generally 20% solids
To 100% varnish is commercially available,
Available.

The cut surface (sealing surface) of the liquid absorbent core of the present invention is
A sealing process is performed at the time of cutting or after cutting in order to obtain the sealing property of the liquid absorbent core. The processing method is not particularly limited, and for example, a method of fusing and sealing the cut surface, a method of applying and sealing an adhesive or the like, and a method of further applying an adhesive after fusing and sealing can be considered. . Any adhesive may be used as long as it does not contain a volatile substance, and examples thereof include a silicone rubber adhesive, an epoxy resin adhesive, a polyurethane adhesive, and a hot melt adhesive. These are appropriately selected in consideration of the type (oil-based or water-based) of the chemical solution used. As the drug solution, for example, various insecticides, bactericides, deodorants, fragrances, etc. dissolved in an organic solvent or water are used for the purpose of insecticidal, sterilizing, aroma and the like.

FIG. 3 shows an example of an apparatus suitable for using the absorbent core in the chemical vaporization method of the present invention. 6 in the figure
Is a container containing the liquid medicine 8, and the container 6 is a container 11
It is stored and held in the inside freely. The upper part of the storage container 11 is open, and the annular heating element 10 is provided in this open part.
Is stuck. The fiber core 1 held by the holder 7 is held in the chemical liquid container 6 in a substantially closed plug shape so that the upper portion thereof is arranged in the center of the annular heating element 10. In addition,
In the figure, reference numeral 12 is a diffusion cylinder in which the chemical liquid 8 is scattered to the outside, 13 is an on / off switch, and 14 is a power cord. Here, the diffusion cylinder 12 has an inner diameter of 10 to 30 mm and a depth of 5 to 40 mm.
The distance between the lower end of the diffusion tube 12 and the upper end of the heating element 10 is preferably set to 1 to 5 mm. It should be noted that although the one shown in the figure is an example of an apparatus suitable for using the liquid absorbent core of the present invention, it is needless to say that apparatuses of various shapes can be used without being limited to this.

As the chemical liquid 8 to be stored in the chemical liquid container 6, an insecticidal liquid, an aromatic liquid or the like is used depending on the purpose. When the above-mentioned device is used as a thermal evaporation insecticidal device, the insecticidal liquid is placed in the container 6, the heating element 10 is energized, and the surface temperature of the fiber core 1 is preferably 70 to 1 depending on the type of insecticide.
Heat to 40 ° C. If the heating temperature is too high,
There is a problem that thermal decomposition and polymerization of the drug easily occur, and the amount of the volatile active ingredient becomes low, and the resulting high boiling point substance etc. accumulates in the liquid absorbing core and causes clogging of the core. It is not preferable because it becomes easy. Further, if the heating temperature is too low, the volatilization of the active ingredient is naturally delayed, and in some cases, only the solvent is volatilized, which may hinder the volatilization of the active ingredient. Therefore, the optimum temperature is selected depending on the type of active ingredient, concentration, volatility of the solvent and the like.
As the insecticidal liquid, a solution prepared by dissolving an insecticide in various solvents is used. As a solvent, it has a high flash point and no odor,
In addition, a toxicologically safe one is preferable. The boiling point of the solvent used depends on the heating temperature of the absorbent core, but is 150
Those in the range of to 350 ° C are preferable. Saturated aliphatic or alicyclic hydrocarbons having 12 or more carbon atoms can be mentioned as those satisfying these conditions, and these are industrially available as normal paraffin, isoparaffin or naphthene hydrocarbon. Besides this,
As the aromatic hydrocarbon, phenylxylylethane or the like can be used as an odorless solvent. Of course, the solvent is not limited to these hydrocarbons as long as the solvent satisfies the above conditions. For example, various nonionic surfactants, preferably polyoxyalkylene alkyl ether-based solubilizers (refer to those that can stabilize the insecticidal component in a clear state in water regardless of the presence or absence of micelle formation. In addition to the agent, a solvent that is compatible with water and oil is also included) to form an aqueous insecticidal solution, and the problem of flammability can be solved.

As the insecticide used in the present invention, various volatile insecticides conventionally used can be used, and examples include pyrethroid insecticides, carbamate insecticides, organophosphorus insecticides and the like. it can. Generally, a pyrethroid insecticide is preferably used because it is highly safe, and examples thereof include the following insecticides. (A) 3-allyl-2-methylcyclopent-2-en-4-one-1-yl dl-cis / trans-chrysanthemate (generic name arethrin, trade name pinamine, manufactured by Sumitomo Chemical Co., Ltd.) ( b) 3-allyl-2-methylcyclopent-2-en-4-one-1-yl d-cis / trans-chrysanthemate (trade name Pinamine Forte, manufactured by Sumitomo Chemical Co., Ltd., hereinafter insecticide A (C) d-3-allyl-2-methylcyclopent-2-
En-4-on-1-yl d-trans-chrysanthemate (trade name: Exulin, manufactured by Sumitomo Chemical Co., Ltd.) (d) 3-allyl-2-methylcyclopent-2-en-4-one-1 -Yl d-trans-chrysanthemate (generic name bioallethrin) (e) 2-methyl-4-oxo-3- (2-propynyl) cyclopent-2-enyl chrysanthemate (f) (S) -2- Methyl-4-oxo-3- (2-propynyl) cyclopent-2-enyl d-cis / trans-chrysanthemate (generic name Praresulin, hereinafter abbreviated as insecticide B) (g) N- (3,4, 5,6-Tetrahydrophthalimido) methyl dl-cis / trans-chrysanthemate (generic name Phthathrine, trade name neopinamine, manufactured by Sumitomo Chemical Co., Ltd.) (h) 3-pheno Cibenzyl 2- (4-ethoxyphenyl) -2-methylpropyl ether (generic name etofenprox) (i) 5-benzyl-3-furylmethyl d-cis / trans-chrysanthemate (generic name resmethrin, trade name Chris Ronforte, manufactured by Sumitomo Chemical Co., Ltd., hereinafter abbreviated as insecticide C) (j) 5-propargyl-2-furylmethyl chrysanthemate (generic name flamethrin) (k) 5-propargyl-2-furylmethyl d- Cis / trans-chrysanthemate (trade name Pinamine D Forte, manufactured by Sumitomo Chemical Co., Ltd., hereinafter abbreviated as insecticide D) (l) 3-phenoxybenzyl 2,2-dimethyl-3
-(2,2-Dichlorovinyl) cyclopropanecarboxylate (generic name permethrin, trade name Exmine, manufactured by Sumitomo Chemical Co., Ltd., hereinafter abbreviated as insecticide E) (m) 3-phenoxybenzyl d-cis / trans-
Chrysanthemate (generic name phenothrin, trade name Smithlin, manufactured by Sumitomo Chemical Co., Ltd., hereinafter abbreviated as insecticide F) (n) α-cyano-3-phenoxybenzyl α-isopropyl-4-chlorophenylacetate (generic name Femvalle Rate, trade name Sumicidine, manufactured by Sumitomo Chemical Co., Ltd.) (o) (S) -α-cyano-3-phenoxybenzyl
(S) -α-isopropyl-4-chlorophenyl acetate (generic name esfenvalerate) (p) (S) -α-cyano-3-phenoxybenzyl
(1R, 3R) -3- (2,2-dichlorovinyl)-
2,2-Dimethylcyclopropanecarboxylate (q) (RS) -α-cyano-3-phenoxybenzyl (1RS) -cis / trans-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropane Carboxylate (generic name cypermethrin) (r) α-cyano-3-phenoxybenzyl d-cis / trans-chrysanthemate (generic name cyphenothrin) (s) α-cyano-3-phenoxybenzyl 2,2
3,3-Tetramethylcyclopropanecarboxylate (generic name phenpropatorin) (t) [(pentafluorophenyl) -methyl] (1
R, 3R) -3- (2,2-dichlorovinyl) -2,2
-Dimethylcyclopropanecarboxylate (generic name fenfluthrin) (u) 1-ethynyl-2-methyl-2-pentenyl d
-Cis / trans-chrysanthate (generic name empentrin, hereinafter abbreviated as insecticide G) (v) 3-allyl-2-methyl-cyclopent-2-en-4-one-1-yl 2,2,3 , 3-Tetramethylcyclopropanecarboxylate (generic name terrareslin) (w) 1-ethynyl-2-methyl-2-pentenyl
2,2,3,3-tetramethylcyclopropanecarboxylate (x) 1-ethynyl-2-methyl-2-pentenyl
2,2-Dimethyl-3- (2,2-dichlorovinyl) cyclopropanecarboxylate (y) N- (3,4,5,6-tetrahydrophthalimide) methyl d-cis / trans-chrysanthemate (commodity) Name neopinamine forte, manufactured by Sumitomo Chemical Co., Ltd., hereinafter abbreviated as insecticide H) (z) dimethyl (4-ethoxyphenyl) {3- (3-
Phenoxy-4-fluorophenyl) propyl disilane Among these, insecticides A to H are preferable in view of their industrial availability, economy, efficacy and safety, and above all, insecticide D
Is superior in terms of efficacy and economy. The concentration of the effective insecticidal component in the insecticidal solution is preferably 0.3% by weight or more and 20% by weight or less, preferably 0.3 to 5% by weight.
The concentration is in the range of. These insecticides may be used alone or in combination. Further, if necessary, a small amount of stabilizer, deodorant, synergist, dye, and other auxiliaries can be added to the liquid chemical. Similarly, when used for the purpose of aroma, various natural and artificial fragrances can be used, for example, animal and / or plant natural fragrances, hydrocarbons, alcohols, phenols, aldehydes, ketones, lactones, The artificial fragrances such as oxides and esters can be used alone or in a mixture of two or more. Furthermore,
Depending on the purpose, various chemicals such as deodorants, bactericides and repellents can be used as long as they are vaporized by heating.
Such various drug concentrations are preferably 0.1 to 10% by weight.

[0013]

Since the liquid absorbent core used in the chemical vaporization method of the present invention contains the inorganic filler in the coating film of the silicone varnish, even if a large amount of the silicone varnish is applied, the liquid medicine will be in the vicinity of the filler particles. Since it moves through a slight gap in the liquid, the liquid absorption and the liquid absorption rate slightly decrease with regard to the evaporation of the liquid, but there is little fluctuation in the amount of vaporization, and the exudation of the liquid due to changes in the internal pressure of the liquid container is almost constant. It is possible to prevent it completely. The distribution and size of voids differ depending on the shape and size of the filler particles, and therefore the optimum amount of addition differs, but the shape of the filler particles, the size and size of the filler particles, consideration of the amount, Depending on the combination, the optimum void distribution can be obtained, and as a result, the reduction of the exudation of the chemical solution and the stabilization of the volatilization amount can be achieved at the same time. Since the central fiber absorbent layer and the fiber braid around it are fixed by the silicone varnish, it is possible to squeeze an excessive amount of the drug solution sucked up from the gap between the two layers by reducing the capillary.

[0014]

The present invention will be described below with reference to examples, but the present invention is not limited to these examples. Example 1 As Example 1, an absorbent core as shown in FIG. 1 was manufactured. The liquid absorbent core 1 is roughly composed of a fiber absorbent layer 2 at the center, a fiber braid 3 around it, and a silicone varnish coating layer 4 covering it. The fiber liquid-absorbing layer 2 is composed of an aggregate of polyester fibers (manufactured by Teijin Ltd., polyester spun yarn, 30th yarn, twin yarn), and the fiber braid 3 is made of polyester fibers (manufactured by Teijin Ltd., 250 denier high-strength tetron yarn). It is made of a braid and covers the fiber liquid absorption layer 2. The silicone varnish coating layer 4 is a base varnish mainly made of a silicone polymer and silica (manufactured by Toshiba Silicone Co., Ltd., rubber-based silicone varnish YR1122).
Solid content 30%), and an inorganic filler with an average particle size of 8μ
An article consisting of the fiber absorbent layer 2 and the fiber braid 3 is dipped in a silicone varnish containing aluminum hydroxide of m, and the excess varnish is scraped off with a metal die having an inner diameter of 7.4 mm while pulling up. It is formed by immediately heating and curing a silicone varnish in a dryer kept at 200 ° C. to cover the outer periphery of the fiber braid 3 and at the same time to form the fiber absorbent layer 2 and the fiber braid 3 together. It is stuck. In this example, the amount of the inorganic filler (aluminum hydroxide) added was 100% solid content of the base varnish.
Four types of liquid absorbent cores were produced, which were 150, 300, 600 and 700 parts by weight based on parts by weight. The liquid absorbent core 1 had a diameter of 7 mm and a length of 75 mm. The sealing surface 5 of the liquid absorbent core 1 was fused and sealed with a nichrome wire heated at the time of cutting.

Example 2 Magnesium oxysulfate whiskers (manufactured by Ube Industries, Ltd., trade name Mosheidi) were added as an inorganic filler in place of aluminum hydroxide in an amount of 10, 30, 60 and 100 parts by weight (base varnish solid content 100 parts by weight). A liquid absorbent core was produced in the same manner as in Example 1 except that (for parts) was used.

Example 3 As an inorganic filler, instead of aluminum hydroxide, a silica balloon (a ratio of the maximum particle size to the minimum particle size of the granular particles is 18, Asahi Glass Co., Ltd., trade name Q-CEL) is added in an amount of 20. , 80, 100 and 150 parts by weight (based on 100 parts by weight of the solid content of the base varnish) were prepared in the same manner as in Example 1 to produce an absorbent core. Each of these is designated as absorbent cores I, II, III and IV.

Example 4 Instead of aluminum hydroxide as the inorganic filler, a mixture of the inorganic fillers used in Examples 2 and 3 (35 parts by weight of magnesium oxysulfate whiskers per 100 parts by weight of the solid content of the base varnish). A liquid absorbent core was produced in the same manner as in Example 1 except that and 20 parts by weight of silica balloon) were used. This is designated as the absorbent core V.

Example 5 Instead of aluminum hydroxide as the inorganic filler, a mixture of the inorganic fillers used in Examples 1 and 3 (50 parts by weight of aluminum hydroxide and 100 parts by weight of solid content of the base varnish and A liquid absorbent core was produced in the same manner as in Example 1 except that 34 parts by weight of silica balloon) was used.

Example 6 As Example 6, an absorbent core as shown in FIG. 1 was manufactured. The liquid absorbent core 1 is roughly composed of a fiber absorbent layer 2 at the center, a fiber braid 3 around it, and a silicone varnish coating layer 4 covering it. The fiber absorbent layer 2 is composed of an aggregate of nylon fibers (manufactured by Teijin Ltd., nylon spun yarn, number 30 twin yarn), and the fiber braid 3 is a braid of nylon fibers (Toray Industries, Inc., nylon long fiber 210 denier). And covers the fiber liquid absorption layer 2. In addition, the silicone varnish coating layer 4 was formed by adding a base varnish mainly composed of a silicone polymer and silica (made by Toshiba Silicone Co., Ltd., rubber-based silicone varnish YR1122, solid content 30%) to a base varnish.
Further, an article composed of the liquid absorbent layer 2 and the fiber braid 3 is dipped in a silicone varnish obtained by adding Shirasu balloon as an inorganic filler, and the excess varnish is pulled up while being pulled up with a metal die having an inner diameter of 7.4 mm. Oyster removal, 200
It is formed by immediately heating and curing a silicone varnish in a dryer kept at 0 ° C. to cover the outer periphery of the fiber braid 3 and at the same time to fix the liquid absorbent layer 2 and the fiber braid 3 together. ing. The size of the absorbent core 1 is 7 m in diameter
m and the length was 75 mm. Liquid absorbent core cut surface (sealed surface) 5
A room temperature curable silicone rubber adhesive (KE445, manufactured by Shin-Etsu Chemical Co., Ltd.) was applied to the above and sealed.
This is designated as absorbent core VI.

Example 7 An aggregate of polyester fibers (manufactured by Teijin Limited, 30th polyester spun yarn, twin yarn) as the liquid absorbent layer 2;
Polyester fiber (manufactured by Teijin Ltd., 250 denier high-strength tetron yarn) as the fiber braid 3, aluminum hydroxide as the inorganic filler, and room temperature curable epoxy resin adhesive (E250 manufactured by Konishi Ltd.) as the adhesive.
Was processed in the same manner as in Example 6 except that was used. This is designated as absorbent core VII.

Comparative Example A liquid absorbent core VIII was prepared in the same manner as in Example 1 except that the fiber braid was coated only with a base varnish mainly containing a silicone polymer and silica. An uncoated absorbent core IX consisting only of layers and fiber braid was produced.

Test Example 1 Volatilization Test A chemical solution container 6 shown in FIG. 2 was prepared by dissolving 1.8 wt% of the insecticide D as normal solution 8 in normal paraffin (oil-based insecticide solution) or 1.8 wt% of the insecticide D. 45 ml of one dissolved in water containing 40% by weight of diethylene oxybutyl ether (aqueous insecticidal liquid) was added, and the liquid absorbent core I of the present invention produced in Examples 3, 4, 6 and 7 was used as liquid absorbent core 1. I
I, III, IV, V, VI or VII or the control absorbent core VIII or IX prepared in Comparative Example was set at a predetermined position. These were set in the heating evaporation device shown in FIG. 3, and the side surface of the liquid absorbent core 1 was heated to 120 ° C. to perform a volatilization test. When the chemical solution became insufficient by the predetermined heating time, only the chemical solution was newly replenished at that time. In the volatilization test, (1) the amount of reduction of the chemical solution per hour and (2) the amount of volatilization of the insecticide per hour were examined. In (2), the sample was trapped in a column packed with silica gel at regular intervals, the insecticide was extracted with acetone, and analyzed by gas chromatogram. The results are shown in Table 1.

[0023]

[Table 1] (1) In the table, the value on the left side represents the amount of chemical solution volatilization (g / hr). (2) In the table, the value on the right side represents the amount of chemical solution volatilization (mg / hr). As a result of the above-mentioned stability test and volatilization test, by using the absorbent core of the present invention, even if a furan ring-containing one such as insecticide D is a drug, it is stable in the present heating evaporation method, The effect was obtained that there was almost no decrease in the volatilization amount and the active insecticidal ingredient over time.

Test Example 2: Exudation of chemical liquid Next, the following test was carried out in order to evaluate the exudation of the chemical liquid due to the change of the internal pressure of the chemical liquid container due to the temperature change during storage and storage of the heating evaporation device. 15 ml of the oil-based insecticidal liquid or the aqueous insecticidal liquid used in Test Example 1 was placed in the chemical liquid container 6 shown in FIG.
The inventive absorbent cores I, II, III, IV, V, VI or VII prepared in Examples 3, 4, 6, 7 or the control absorbent cores VIII or IX prepared in the comparative examples.
Is set to a predetermined position, set in the heating evaporation device shown in FIG. 3, and when energized, the gas phase part 9 in the chemical liquid container 6 is warmed,
As the internal pressure of the chemical liquid container 6 rises, the fiber braid 3 and the silicone varnish coating layer 4 above the liquid absorbent core holder 7
The presence or absence of exudation of the drug solution from Table 2 shows the results.

[0025]

[Table 2] ◯: No exudation of the drug solution is observed. Δ: Exudation of the drug solution is slightly observed. X: Exudation of the drug solution is recognized.

Test Example 3: Chemical solution leaching test In order to confirm the strength of the molten cross section when an external force is applied to the molten cross section of the liquid absorbent core, the liquid absorbent cores I and II only subjected to fusing and sealing,
The test was performed using liquid absorbent cores VI and VII coated with an adhesive after fusing and sealing, and control liquid absorbent cores VIII and IX of Comparative Examples. As a test method, each absorbent core was set in a drug solution container filled with 15 ml of an aqueous insecticidal solution, and the drug solution container was inverted and dropped from a height of 30 cm on a 15 mm thick plywood plate. Twenty points were prepared, and the number of presence or absence of leaching of the chemical liquid due to temperature change during use in the state of being attached to the heating evaporation device was examined. Table 3 shows the results.

[0027]

[Table 3]

[0028]

As described in detail above, in the chemical vaporization method of the present invention, a silicone varnish obtained by adding an inorganic filler to a base varnish mainly composed of a silicone polymer and silica is used as a liquid absorbent core. By covering the entire braid, by using a fiber absorbent layer and a fiber braid fixed by this silicone varnish,
In the case of the conventional fiber core, it is possible to make the amount of the chemical solution volatilized, which was unstable, stable, and without causing the chemical solution leak due to the chemical solution leak due to the inversion of the chemical solution container or the increase in the internal pressure of the chemical solution container due to heating, It is very safe and economical.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an absorbent core used in the method of the present invention.

FIG. 2 is a cross-sectional view showing an example of a liquid medicine container provided with a liquid absorbent core used in the method of the present invention.

FIG. 3 is a cross-sectional view showing an example of a heating evaporation device in which a liquid absorbent core used in the method of the present invention is installed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fiber core (liquid absorption core) 2 Fiber liquid absorption layer 3 Fiber braid 4 Silicone varnish coating layer 5 Sealing surface 6 Chemical liquid container 7 Liquid absorption core holder 8 Chemical liquid 9 Gas phase part 10 Heating element 11 Storage container 12 Diffusion cylinder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Hase 4830 Takatsuka-cho, Hamamatsu-shi, Shizuoka Prefecture, Crabe Co., Ltd. (72) Inventor Osamu Yamaguchi 4830 Takatsuka-cho, Hamamatsu-shi, Shizuoka Prefecture

Claims (8)

[Claims] 1. A liquid absorbent containing a drug is absorbed into an absorbent core,
In a heating evaporation method for heating a liquid absorbent core to evaporate a drug, the liquid absorbent core has a liquid absorbent layer made of fibers at the center thereof and a coating layer made of a braid of fibers around the liquid absorbent core. The product is coated with a silicone varnish obtained by further adding an inorganic filler to a base varnish mainly composed of a silicone polymer and silica, and the fiber absorbent layer and the fiber braid are fixed by the silicone varnish. A method for heating and evaporating chemicals, which is a liquid core. 2. The inorganic filler has an average particle size of 0.1 to 20 μm.
2. The method for heating and evaporating chemicals according to claim 1, wherein the liquid-absorbent wick in the form of amorphous particles is used. 3. The method for heating and evaporating chemicals according to claim 1, wherein a liquid absorbent core in which the inorganic filler contains at least acicular particles having an average aspect ratio of 5 or more is used. 4. The method for heating and evaporating chemicals according to claim 1, wherein an absorbent core containing an inorganic filler containing at least spherical particles is used. 5. The method for heating and evaporating chemicals according to claim 4, wherein an absorbent core is used in which the ratio of the maximum particle size to the minimum particle size of the spherical particles contained in the inorganic filler is 8 or more. 6. An inorganic filler is a base varnish having a solid content of 100.
The method for heating and evaporating chemicals according to claim 2, wherein an absorbent core added in an amount of 150 parts by weight or more and 700 parts by weight or less based on parts by weight is used. 7. The inorganic filler is a base varnish having a solid content of 100.
The chemical vaporization method according to claim 3, wherein an absorbent core added in an amount of 10 parts by weight or more and 100 parts by weight or less based on parts by weight is used. 8. An inorganic filler is a base varnish having a solid content of 100.
The method according to claim 4 or 5, wherein an absorbent core added in an amount of 20 parts by weight or more and 150 parts by weight or less with respect to parts by weight is used.