JP2000014592A - Synthetic resin pumice and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the moisture retaining of the skin without degrading the effect of chipping off the surface of the keratinized skin by mixing an aq sericin soln. with the inside of a stock son. of a synthetic resin, such as rigid polyurethane, and foaming the mixture. SOLUTION: The polyol stock soln. is first formed by mixing a foaming agent, foam shaping agent, polyol, catalyst, fire-retardant agent and the aq sericin soln. or sericin powder and kneading the mixture. Next, a polyisocyanate stock soln. contg. polyisocyanate and a polyol stock soln. kneaded with the sericin are respectively metered and are mixed to form a foaming stock soln. When this stock soln. is uniformly stirred, a polyaddition reaction is initiated and simultaneously reaction heat is generated. The gas formed by the reaction heat of the foaming stock soln. forms cells with the silicone foam shaping agent as a nucleus, by which a foaming state is attained. The viscosity of the foaming stock soln. is increased by accompanying the same until finally the soln. solidifies to a resinous state having a three-dimensional structure, by which a rigid urethane foam is formed. The synthetic resin pumice including the numerous cells is completed by molding this foam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pumice made of a synthetic resin among pumice stones.

[0002]

2. Description of the Related Art Pumice is generally known as a natural one formed of volcanic rock. By the way, natural pumice is a gas in which gas bubbles are formed in magma, and the size of the bubbles is often uneven and the quality is also uneven, and it is hard or coarse (large bubbles) Then, there was a problem that the skin was hurt. Further, since a large mass is cut out and formed into an affordable size, the shape is limited to a shape with little waste and a good yield, such as a square or an oval shape.

[0003] In order to solve such problems, pumice is formed of a synthetic resin such as a rigid polyurethane foam as disclosed in Japanese Utility Model Registration No. 3908950, for example. It has been proposed to apply or mix the silk powder.

[0004]

However, in the case where a silk powder is provided on a synthetic resin pumice such as a rigid polyurethane foam described in the above-mentioned registered utility model publication, the component of the silk powder is a line segment of silk fiber. Since it is formed of water-insoluble fibroin, it intervenes between the surface of the pumice and the skin it comes into contact with and acts as a cushion. There was a problem that the dropping action was weakened. The present invention has been proposed in order to solve such a problem, and provides a synthetic resin pumice which is capable of moisturizing the skin without reducing the effect of scraping off the surface of the keratinized skin. It is intended to be able to do so.

[0005]

Means for Solving the Problems To achieve the above object, a synthetic resin pumice according to the present invention is characterized by being formed of a foamed synthetic resin such as hard polyurethane having sericin. Further, in the method for producing a synthetic resin pumice according to the present invention, a synthetic resin pumice is formed by mixing a sericin aqueous solution or / and sericin powder into a stock solution of a synthetic resin such as hard polyurethane and foaming the stock solution. It is characterized by the following.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The synthetic resin pumice of the present invention and a method for producing the same will be described below with reference to the drawings. FIG. 1 is a front view of a synthetic resin pumice, FIG. 2 is a side view thereof, and reference numeral 1 in the figure indicates the synthetic resin pumice as a whole. This synthetic resin pumice 1 is formed of a closed-celled rigid polyurethane foam, and sericin is mixed in the rigid polyurethane foam. Next, a manufacturing process of the synthetic resin pumice 1 in which sericin is mixed will be described with reference to FIG.

First, a foaming agent, a foam stabilizer, a polyol, a catalyst, a flame retardant, a sericin aqueous solution or a sericin powder are mixed and kneaded to form a polyol stock solution. Here, the sericin aqueous solution or sericin powder is obtained by immersing a cocoon formed from the silk gland contents of the silkworm larva in boiling water, dissolving the fibroin which is a silk thread in the remaining boiling water, and extracting sericin from the boiling water. Or powdered. The silk gland content of the silkworm larvae contains about 70% fibroin and about 30 sericin.
The sericin contains about 10% of serine, which acts as a humectant.

[0008] In addition, the sericin aqueous solution used for preparing the polyol-based stock solution uses an 11-fold concentrated solution of sericin obtained as described above, and when the sericin powder is mixed, the oyster shell is used as the main component. And a natural antibacterial agent. On the other hand, a polyisocyanate-based stock solution containing a polyisocyanate is prepared, and a polyol-based stock solution in which sericin is kneaded and a polyisocyanate-based stock solution are respectively measured and mixed to form a foamed stock solution. When the two stock solutions prepared and measured as described above are mixed and uniformly stirred, first, the polyisocyanate and the polyol start a polyaddition reaction to generate a polyurethane resin and simultaneously generate heat of reaction.

When the volatile substance is used as a foaming agent, the heat of reaction vaporizes the foaming agent and generates gas. When water is used as a foaming agent, it reacts with polyisocyanate to generate polyurea, and at the same time, generates carbon dioxide gas, and at the same time, promotes polyurea to resin. These gases generated by the temperature rise due to the reaction heat of the foaming stock solution or by the reaction become bubbles around the silicone foam stabilizer. The state in which these bubbles are generated and grown countlessly is foaming as shown in FIG.
This reaction further proceeds, and the viscosity of the undiluted foaming liquid increases with it, and finally solidifies into a resin having a three-dimensional structure to form a rigid urethane foam.

When the rigid urethane foam formed as described above is molded, a substantially oval synthetic resin pumice 1 including sericin formed of countless cells as shown in FIGS. 1 and 2 is completed. is there. In addition, the shape of the synthetic resin pumice 1 may be a donut shape as shown in FIG. 4 instead of the oval shape, or may be formed in another shape, for example, a star shape, a sphere, a rod shape, or the like. When the synthetic resin pumice 1 containing sericin formed as described above is shaved off, for example, in the bathroom or the like, the keratinized surface portions of the feet and elbows are wetted, the detergent is applied, or the synthetic resin pumice 1 Rub the pumice 1 with water or soap.

Then, the skin is brought into contact with the keratinized skin in a state where water is retained by the water retaining power of sericin (silk grease) contained in the synthetic resin pumice 1 in particular, and the keratinized portion is scraped off. There is wet sericin on the surface of the pores formed by the bubbles, and this moist sericin gently contacts the skin and scrapes off only the keratinized skin, so that the new skin under it will be damaged Can be prevented. In the above-described embodiment, the sericin aqueous solution or the sericin powder is mixed when preparing the polyol-based stock solution. However, the present invention is not limited to this, and until foaming, for example, is indicated by a dotted line in FIG. As described above, the polyol stock solution and the polyisocyanate stock solution can each be measured and mixed, and can be mixed when the foaming stock solution is formed.

[0012]

According to the present invention, as described above, sericin is contained in a synthetic resin pumice formed by independently foaming a foamed synthetic resin such as hard polyurethane, so that the synthetic resin pumice is applied to the skin. When it is rubbed with soap or water, the water retention capacity of serine in sericin contained in synthetic resin pumice makes it possible to contact the skin in a water-retained state and gently contact the skin to prevent damage. In addition, there is an advantage that the original action of the pumice stone for removing the keratinized portion of the skin surface can be sufficiently exhibited.

Further, when sericin contained in the synthetic resin pumice of the present invention dissolves and adheres to or is absorbed by the touched skin,
There is also an advantage that the moisture retention power moisturizes the skin and contributes to skin care and beautiful skin creation.

[Brief description of the drawings]

FIG. 1 is a front view of a synthetic resin pumice.

FIG. 2 is a side view of a synthetic resin pumice.

FIG. 3 shows a manufacturing process of a synthetic resin pumice.

FIG. 4 is a front view showing a modified example of a synthetic resin pumice.

[Explanation of symbols]

 1 ... Synthetic resin pumice

Claims (2)

[Claims] 1. A synthetic resin pumice formed of a foamed synthetic resin such as rigid polyurethane having sericin. 2. Production of a synthetic resin pumice, characterized in that a sericin aqueous solution and / or sericin powder is mixed into a stock solution of a synthetic resin such as hard polyurethane and the stock solution is foamed to form a synthetic resin pumice. Method.