JPS61195811A - Manufacture of latex sponge - Google Patents

Abstract

PURPOSE:To enable one sponge to be substituted for a plurality of different kind sponges by vulcanizing the latex sponge intermediates at gel stage, after they have been integrally shaped. CONSTITUTION:The first latex sponge raw material 10a poured into a division 16 gels by leaving said material as it is for 5-10 minutes at room temperature, whereby the first intermediate 10b of the first latex sponge is obtained. Said material is left as it is at room temperature for about 20 minutes after gelation, and then a division 12 is removed. The second latex sponge 20a after foaming is poured into another division 18. The raw material 20a is left as it is at room temperature for about 20 minutes after its gelation, and then it is vulcanized at about 160 deg.C for about 10 minutes. By this vulcanization, elasticity is imparted to the intermediates of the first and second latex sponges, and thus, the latex sponge is shaped. By changing the physical properties of materials in the divisions 10 and 20, the same effect as having integrally two kind puffs is obtained. By using the divisions 10 and 20 separately as required, it is enabled to be applied to other kinds of cosmetics.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing latex sponges having partially different properties, which are used for cosmetic puffs, bath sponges, packing materials, etc.

(Prior Art) A latex sponge is manufactured from sponge raw materials with a predetermined composition through the steps of foaming, gelling, and vulcanization, and has a single property determined by manufacturing conditions such as the composition. Latex sponges are suitable as chemical puffs, bath sponges, packing materials, etc. due to their appropriate water retention and elasticity, and are used as they are or cut into predetermined shapes.

Incidentally, the commercial value of these sponge bodies largely depends on their design, and novel designs are required. However, since their external shapes are restricted from a functional standpoint, it is impossible to design them freely, and the designs have to be monotonous.

Furthermore, since it is not possible to clearly indicate the intended use or type of sponge, these must be written on the wrapping paper, and if the wrapping paper is thrown away, the above description becomes unclear and the sponge cannot be used properly.

In addition, the optimal properties of cosmetic puffs vary depending on the cosmetic product, and when using many types of cosmetics, it is preferable to use different puffs depending on the cosmetic product, but it is difficult to carry multiple puffs. Currently, I am dissatisfied with the use of the same puff, as it is cumbersome.

Furthermore, with regard to bath sponges, the optimum properties required of the sponge differ depending on the area of use, and as preferences diversify, the requirements for bath sponges within a household also vary, resulting in the need for multiple sponges with different properties. It was like that.

(Problems to be Solved by the Invention) This invention has been made in view of the above-mentioned points. The present invention provides a method for producing a latex sponge that can be used as a substitute for a plurality of sponges.

(Means for Solving the Problem) The gist of the present invention is that in the production of latex sponge through the steps of foaming, gelling, and vulcanization, a latex sponge intermediate in a gel state is placed in a molded product. The foamed latex sponge raw material is poured into a mold to form a gel-state latex sponge intermediate, and then vulcanized.

That is, in this invention, a latex sponge raw material having a predetermined composition and foaming rate is injected into a mold so as to be in contact with a gel-like latex sponge intermediate of a predetermined shape and color located in the mold, and then gelled. A gel-like vertical sponge intermediate body is formed integrally with the intermediate body, and the unified intermediate body is vulcanized.

(Function) The latex sponge intermediate in a gel state is obtained by gelling the latex sponge raw material after foaming due to a decrease in pl+, and is composed of a jelly-like semi-solid or solid and has self-shape retention. Therefore, the latex sponge intermediate that is placed in advance in the mold and the latex sponge intermediate that is injected into the mold later and gelled do not mix and become one body with clear boundaries. Form a gel-like latex sponge intermediate. Then, by vulcanization, strong bonds are formed between the rubber molecules of the intermediate, giving it elasticity and forming a latex sponge.

The latex sponge thus obtained is clearly divided into a part consisting of a gel-state latex sponge intermediate placed in the mold in advance and a part consisting of a gel-state latex sponge intermediate injected afterwards. It is classified.

Therefore, a pattern can be formed on the surface of a latex sponge by making the intermediate body placed in the mold in advance and the intermediate body injection-formed later in different colors.
Furthermore, the physical properties can be partially varied by varying the composition other than iH or the foaming state.

(Example) 0 First Example FIGS. 1A to 1C are perspective views showing an example of manufacturing a puff consisting of two approximately semicircular sections having different properties. The process will be explained below.

(i) Foaming and injection of ml of latex sponge raw material (Figure (a)) 100 parts by weight of natural rubber latex, 2 ml of vulcanizing agent (sulfur)
．． 5 parts by weight, as a vulcanization accelerator, 2.5 parts by weight of thiazole type (rDZJ manufactured by Ohmukai Shinko Chemical Co., Ltd.), 2.5 parts by weight of chlorine dithioate (rEZJ manufactured by Ohmukai Shinko Chemical Co., Ltd.), zinc oxide (manufactured by Hakusui Chemical Co., Ltd.) Zinc flower No. 1 J) 3.0 parts by weight, dispersant (Kao Soap [Perex TAJ) 0.5 parts by weight, pigment 0.1~
A raw material consisting of 0.5 parts by weight is stirred with a household cake whisk to a predetermined ratio. This foaming rate varies depending on the length of stirring time.

After foaming, 4.0 parts by weight of sodium fluorosilicide is mixed into the foamed raw material and further stirred to obtain a large latex sponge raw material.

The obtained first latex sponge material $-110a,
The mixture is injected into one compartment 16 of a cylindrical mold 14 divided into two by a partition plate 12.

(II) Foaming and injection of the second latex sponge raw material (
(B)) The first latex sponge raw material 10a injected into the compartment 16 is left to gel at room temperature for 5 to 10 minutes, and the first latex sponge material 10a is injected into the compartment 16.
A latex sponge intermediate 10b is obtained.

In this gelation, the sodium silicofluoride in the first latex sponge raw material 10a gradually reacts to form cations, and the pH of the latex sponge raw material H10a of M1 is reduced to about 1.
By reducing it from 0-11 to 8-9.

After the gel dies, it is left at room temperature for about 20 minutes, and then the partition plate 12 is removed and the foamed second latex sponge raw material 20a is injected into the other compartment 18. The second latex sponge raw material 20a uses SBR latex or NBR latex instead of natural rubber latex in the first latex sponge raw material, or changes the type and amount of pigments and other additives, or changes the foaming rate. , or a combination of these changes as appropriate.

(i i i) The second latex sponge raw material 20a injected into the vulcanization section 18 is the same as the first latex sponge raw material 110a.
It gels in the same manner as above and becomes a second latex sponge intermediate. The first latex sponge intermediate and the second latex sponge intermediate are joined together when the second latex sponge intermediate is formed, that is, when the second latex sponge raw material is gelled, to form an integrated latex sponge intermediate. Become.

Approximately 20 minutes after gelation of the second latex sponge raw material 20a
The mixture is left at room temperature for several minutes, and then vulcanized at about 160° C. for about 10 minutes. This vulcanization imparts elasticity to the first and second latex sponge intermediate bodies, forming a latex sponge.

(1v) After female mold vulcanization, take out the latex sponge from the mold. still,
If a mold release agent such as a soap solution is applied to the inner surface of the mold in advance, mold release becomes easier.

(V) Dry Smoke The obtained latex sponge contains about 20% moisture, so it is dried at about 70° C. for 24 hours.

(v+) Cutting (Figure (c)) The dry-exploded latex sponge 22 is cut to a predetermined thickness using a cutting tool 24 to form puffs.

The obtained puff has a section 10 made of the first latex sponge raw material and a section 20 made of the second latex sponge raw material, which are integrally combined, and by changing the physical properties of the sections 10 and 20, two types of puffs can be obtained. This is the same as having a puff in one piece, and by using compartments 10 and 20 differently, it becomes possible to handle other types of cosmetics. Also, section 1
By changing the colors of 0 and 20, a novel design is created.

Note that the ml latex sponge intermediate body 10b may not be molded in the same mold 14, but may be molded in advance elsewhere and placed in the mold 14.

0 Second Embodiment FIGS. 2(A) to 2(C) are perspective views showing an example of manufacturing a puff having a pattern in the center. Hereinafter, a concise explanation will be given, excluding any overlap with the explanation of the first embodiment.

First, the first latex sponge intermediate body 26b in a gel state as shown in FIG.

The latex sponge intermediate body 26b is placed in the mold 14 as shown in FIG. . The raw material 28a gels to become a second latex sponge intermediate, which intermediate forms the first latex sponge intermediate.
It is integrally joined with the latex sponge intermediate body 26b.

After being left at room temperature for a predetermined period of time, the latex sponge 30 is vulcanized, released from the mold, and dried, and the resulting latex sponge 30 is cut into a predetermined thickness to form a puff.

The resulting puff has a portion 26 formed from a first latex sponge intermediate and a second portion 26 of a different color from the first latex sponge intermediate.
It is clearly divided into a portion 28 formed from a latex sponge raw material, and has a novel pattern consisting of the portion 28.

O Third Embodiment FIG. 3(A) is a perspective view showing an example of manufacturing puffs with different properties on the front and back sides. This manufacturing process is substantially the same as that of the first embodiment, and will be briefly explained.

First, as shown in Figure (A), the foamed first latex sponge rg and material 32a are poured into the mold 34. and,
After the raw material 32a gels and becomes a first latex sponge intermediate 32b as shown in Figure (B), a foamed second latex sponge having a different composition or foaming rate from the first latex sponge raw material is produced. Original H36a to intermediate 32b
Inject on top. The injected raw material 136a gels to become a second latex sponge intermediate, which in turn forms a second latex sponge intermediate.
is integrally bonded to the latex sponge intermediate body 32b.

Then, after a predetermined period of time has passed, it is vulcanized, released from the mold, and then dried to obtain the latex sponge 38 shown in FIG. The latex sponge 38 consists of a part 32 made of a first latex sponge raw material 32a and a part 36 made of a second latex sponge raw material 36a.
The properties of the tables are different.

Incidentally, by using a large mold, the large latex sponge obtained after drying may be punched or polished into a desired shape.

0 Fourth Embodiment FIG. 4(A) shows a first latex sponge intermediate 42b provided with a rim 40 around the periphery by impregnation or coating with a pigment, and FIG. The puff 44 shown in FIG. The puff 44 has a border 40 pattern in the center.

Although the first to fourth embodiments are examples of manufacturing puffs, it is possible to obtain a bath sponge in the same manner as these.

0 Fifth Embodiment FIG. 5(A) shows a first latex sponge intermediate body 46b in which a character insert 46 made of rubber or plastic is embedded, and FIG. 5(B) shows a second latex sponge intermediate body 46b using the intermediate body 46b. Bath sponge 50 that was manufactured and shamed as in the example
shows. An insert 46 is provided on the surface of the bath sponge 50.
A character consisting of is formed.

(Effects) This invention involves injecting a foamed latex sponge raw material into a mold in which a latex sponge intermediate in a gel state is placed, integrally forming a latex sponge intermediate in a gel state, and then processing it. It is sulfurized to produce latex sponge.

Therefore, according to the present invention, a latex sponge with a pattern can be obtained by changing the color of the gel-state latex bond intermediate placed in the mold and the latex sponge intermediate to be injection-molded later. Latex sponges with partially different properties can be manufactured by changing the formulation and foaming rate.

As described above, according to the present invention, it is possible to easily produce a latex sponge that has a pattern or partially different properties, and if the obtained latex sponge is used for puffs etc., it can be used for novel purposes or uses that were not previously available. can be displayed on the sponge, thereby ensuring appropriate uses, or providing a puff etc. that can be substituted for multiple items with different properties. Further, if latex sponges having partially different properties are used as the packing material, the sealing performance can be made more perfect.

[Brief explanation of drawings]

The drawings relate to embodiments of the present invention, and FIGS. 1(a) to (c) are perspective views showing the outline of the manufacturing process of the first embodiment, and FIGS. 2(a) to (c) are perspective views of the second embodiment. 3(A) to 3(C) are perspective views showing an outline of the manufacturing process of the third embodiment, FIG. 4 relates to the fourth embodiment, and FIG. FIG. 5 is a perspective view of the first latex sponge intermediate; FIG. 5 is a perspective view of the puff; FIG. 5 is a perspective view of the first latex sponge intermediate; is a perspective view of a bath sponge. 10b, 26b, 32b, 42b, 48b-first latex sponge intermediate, 20a, 28a,
36 a-Second latex sponge raw material patent applicant Inoue MCP Co., Ltd. Figure 1 m2 Figure 3

Claims (1)

[Claims] A latex sponge characterized by injecting a foamed latex sponge raw material into a mold in which a latex sponge intermediate in a gel state is placed to integrally form a latex sponge intermediate in a gel state, and then vulcanizing the latex sponge material. Production method.