JPH0422582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an integrated volatile body made of a gel composition containing a volatile substance, and relates to a transparent gel composition containing a volatile substance that is stable and long-lasting. The present invention relates to an integrated volatile body made of a gel composition.

Conventional technology Various substances have been developed as carriers for retaining volatile substances such as fragrances, bactericides, insecticides, and insect repellents for the purpose of constant and stable volatilization over long periods of time. It's here. For example, carriers for fragrances such as aromatics include those using polysaccharides as gelling agents such as carrageenan, alginate, gelatin, pectin, agar, karaya tragacanth, and starch, paper, fibers, various plastics, or paradichlor. There are sublimable substances such as benzene. Techniques have also been developed to make these various carriers transparent in order to achieve a beautiful appearance. For example, JP-A No. 48-9984 uses Gelol D to dissolve and solidify fragrances in alcohol, and JP-A-58-1457 uses super absorbent resin to disperse and dissolve fragrances.
JP-A No. 59-25753 discloses a product in which a fragrance is solubilized using a surfactant and then gelled using an isobutylene-maleic anhydride copolymer and polyethylene polyamine; A transparent gel made of a higher fatty acid alkanolamine and a surfactant is disclosed. However, these transparent gels have drawbacks such as not being able to obtain the highly clear transparency of water or glass, having weak gel strength, lacking heat resistance, and producing bubbles during gel production. There has been a desire for highly transparent carriers with improved properties.

Purpose of the Invention The purpose of the present invention is to provide a volatile substance-containing gel composition that is highly transparent, stable, strong, and has a sustained release effect that is not possible with conventional techniques. That is.

Structure of the Invention The present invention resides in a volatile body comprising a transparent integral gel-like composition in which a cured product of a room-temperature-curable silicone rubber is used as a carrier and a volatile substance is supported on the carrier.

Room-temperature-curing silicone rubber (hereinafter referred to as RTV silicone rubber) requires reactive polysiloxane, which has the property of reacting with a crosslinking agent and then adding a curing agent at room temperature, which causes the curing reaction to proceed and become a rubber elastic body. A typical example is the formula [In the formula, A represents a methyl group or a vinyl group, B represents hydrogen or a vinyl group, R represents a methyl group, a vinyl group, a phenyl group, or a fluoroalkyl group, and n represents a
An integer from 100 to 1000]. A crosslinking agent and/or a curing catalyst are added to such a reactive polysiloxane beforehand or during curing.

The RTV silicone rubber used in the present invention is made from the above-mentioned reactive polysiloxane, and is in a liquid or paste form before curing. The curing reaction after the reaction between the polysiloxane and the crosslinking agent can be divided into those that proceed due to moisture in the air, and those that proceed by the addition of various curing agents. The properties of the rubber after curing are excellent in heat resistance, weather resistance, durability, cold resistance, chemical resistance, electrical properties, etc., and it is used in fields such as the electrical and electronic industry, automobiles, and construction. Until now, it has not been known to use this as a carrier for a dispersive substance. RTV silicone rubber is classified into one-component type and two-component type based on product form, and there are condensation type and addition type based on curing mechanism, and more specifically, based on reaction type, dealcoholization, oxime removal, acetic acid removal, and hydroxylamine removal. , dehydrogenation type, etc. As described above, it is manufactured from polyorganosiloxane, a polymer compound having a skeleton of Si--O bonds. One-component RTV silicone rubber is made of reactive polysiloxane,
It is composed of fillers such as silica and calcium carbonate, a crosslinking agent, a curing catalyst, other pigments, a heat resistant agent, and a fungicide. Moisture in the air causes a curing reaction, resulting in a rubber elastic body. Note that the silica and the like mentioned above are fine particles on the order of microns, and do not impair transparency. As mentioned above, the RTV silicone rubber of the present invention may contain any other additive components as long as it can be cured at room temperature and exhibit a rubbery appearance. Two-component type RTV silicone rubber consists of a main component (base) and a curing agent (catalyst), and diorganopolysiloxane is used as the base polymer for the main component.

The basic composition of two-component type RTV silicone rubber consists of a base polymer, a crosslinking agent, a curing catalyst, a filler, and other pigments and a rust preventive agent.In addition to the base polymer, the main component also contains a crosslinking agent and a curing catalyst. It may happen. Further, the curing agent includes a curing catalyst and a crosslinking agent. As a crosslinking agent, a silane or siloxane having a group such as an acetoxy group, an alkoxy group, or a ketoxy group is used. Tin as a curing catalyst,
Metal compounds such as platinum are used, such as dibutyltin acetate, tin laurate, chloroplatinic acid, and the like.

There are two methods for adding volatile substances to these silicone rubbers. One method is to add a volatile substance to the silicone rubber before curing it, and the other method is to impregnate and absorb the volatile substance into the cured silicone rubber. In particular, in order to obtain a composition with excellent transparency, one-component RTV silicone rubber uses a condensation reaction type (dealcolation type).
For two-component type, addition type RTV silicone rubber is preferable.

As volatile substances, those used in ordinary volatile substance-containing gel compositions such as perfumes, bactericides, insecticides, fungicides, and deodorants can be used as appropriate. When a volatile substance is added to a two-component catalyst-curing silicone rubber before curing, it is necessary to select a volatile substance that does not cause the catalyst to lose its activity. If the volatile substance is crystallized and difficult to dissolve in the silicone rubber base material, it may be dissolved in a solvent that is easily soluble. There is no particular limit to the amount of volatile substances added. It is usually about 1 to 50%.

The volatile substance-containing gel composition of the present invention exhibits remarkable effects when an odorless organic solvent is used in combination with the organic solvent. Here, the organic solvent refers to an odorless liquid organic compound that can dissolve the reactive polysiloxane before curing, and includes paraffin hydrocarbons and the like. Such organic solvents are usually added to silicone rubber in advance. The amount of organic solvent is 5 to 90% of the total gel composition, especially 5%.
About 60% is preferable.

It takes about 24 hours at room temperature for the silicone rubber to cure after adding the volatile substance, but the curing time can be shortened by raising the temperature. Sho 60
If the temperature is higher than 0.degree. C., it is not preferable for highly volatile substances such as fragrances, since the loss is large.

If volatile substances are to be absorbed into the cured silicone rubber, use a lemon-based fragrance for about 48 hours at 30°C.

Effects of the Invention The volatile substance-containing gel composition according to the present invention has high transparency like water or glass, and has a high transparency at low temperatures (-10
℃), it does not lose its transparency and volatile substances do not leak out from the outside of the system. It is also stable even at high temperatures (100℃) and does not melt like carrageenan gel.
By changing the quantitative ratio of the silicone rubber used, it is possible to obtain a product with the desired strength ranging from jelly-like to rubber-like. It is also non-toxic, can be colored freely, and has an excellent sustained release effect on volatile substances. Due to the strength of gel, it can be molded and made into various shapes easily.

If you want a product that utilizes transparency to create an interior decoration effect, try artificial flowers, artificial fruits, artificial plants, etc.
It is also possible to encapsulate ornamental objects such as mica in the compositions of the invention. Also, by placing RTV silicone rubber in various containers before it hardens, products in various forms can be obtained. Furthermore, by processing the cured composition, it is also possible to form it into any desired shape. In order to utilize the high degree of transparency of the present invention as a product appeal, a container that exhibits transparency, such as a wine glass, can also be used. As can be understood from the above, in the present invention, the term "integral" refers to a non-free-flowing continuous solid state rather than a free-flowing material such as a powder or granule. Of course, the final product is not limited to consisting of one continuous solid, but also includes those consisting of a combination of a plurality of continuous solid molded pieces as long as it exhibits non-free flowing properties.

Examples Examples of the present invention will be described below, but the present invention is not limited only to the examples.

Example 1 10 g of one-component RTV silicone rubber SE-9140 (manufactured by Toray Silicone Co., Ltd.) was mixed with 2 g of lemon fragrance and pigment to make a homogeneous solution, which was left at 40°C for 3 days. An extremely beautiful aromatic gel with clear feel and transparency was obtained.

Example 2 To 10 g of two-component RTV silicone rubber SE-1821 (manufactured by Toray Silicone Co., Ltd.), 2 g of floral type fragrance and pigment were added to make it homogeneous, then 1 g of curing agent was added thereto, and the mixture was heated at 60°C for 20 hours. When left to stand, a beautiful aromatic gel similar to that of Example 1 was obtained.

Example 3 10 g of two-component RTV silicone rubber SE-1821 (manufactured by Toray Silicone) and 10 g of paraffinic hydrocarbon
Take g in a container and make a homogeneous solution. Add 1 g of curing agent and leave it at 60°C for 10 hours to obtain a transparent gel. When 2 parts of lemon flavoring was added to 10 parts of this gel and left at 30°C for 48 hours, a beautiful fragrant gel with transparency similar to that of glass was obtained.
The volatilization characteristics of this aromatic gel are shown in FIG.

Example 4 5 g of one-component RTV silicone rubber SE-9140 (manufactured by Toray Silicone Co., Ltd.) and 4 g of paraffinic hydrocarbon
g and 1 g of paradichlorobenzene in a container,
When left uncovered at room temperature for 48 hours, a beautiful gel with excellent transparency was obtained.

[Brief explanation of drawings]

FIG. 1 is a graph showing the relationship between the residual rate of volatile substances and the number of days elapsed when a lemon fragrance is used as the volatile substance in the transparent gel according to the present invention.

Claims (1)

[Scope of Claims] 1. A volatile material consisting of a transparent integral gel-like composition in which a cured product of a room-temperature-curable silicone rubber is used as a carrier and a volatile substance is supported on the carrier. 2 Claim 1 containing an organic solvent
Volatile substances listed in section. 3. The volatile material according to claim 1 or 2, wherein the volatile substance is added to the room temperature curable silicone rubber before curing. 4. The volatile material according to claim 1 or 2, which is obtained by absorbing and impregnating a volatile material into a cured product of room temperature curable silicone rubber containing a solvent.