JPH085989B2 - Method for manufacturing puff base material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a puff base material comprising a closed cell base material layer and an open cell surface layer formed on the surface of the base material layer. The present invention relates to a method for easily and surely producing a puffing base material having a good skin contact property, excellent cosmetic properties, and no peeling between the base material layer and the surface layer.

[0002]

2. Description of the Related Art In a conventional open-cell foam for a puff, a liquid foundation penetrates internally. Therefore, a method of covering the surface with the liquid foundation (Jitsukai Sho 63-1)
No. 66110), a method of resin-treating the surface (Japanese Patent Publication No. 2-35781), a method of forming a latex film on the surface (Japanese Patent Laid-Open No. 63-19917), and a method of preventing by flocking the surface (Shokaisho). 61-126908). Further, a method of making the foam into closed cells to prevent internal penetration of the liquid foundation (JP-A-4-8739), and a method of polishing the surface of the closed cell foam to make it rough so as to improve cosmetic properties. (Actual Kaihei 1
No. 115,417) and the like are known.

The puff used as a cosmetic applicator has a hardness of Hf 50 to 75 ° and a density of 0.15 g /
Most of them are about cm ³ . However, at present, the hardness is Hf 30 because consumers are demanding puffs that have good softness, softness, and skin feel and are comfortable to use.
It is necessary to manufacture a puffing base material having a density of about 0.12 g / cm ³ .

[0004]

However, in the method of forming a surface film and the method of resin processing described above, it is difficult to control the process, so that the film is uneven, and the foundation on the film slips on the skin during makeup. Causing poor makeup. Further, in the method of roughening the closed cell foam and the surface, it is suitable for a specific liquid foundation, but when the viscosity of the liquid foundation changes, the foundation may be included in the broken cell surface or the rough surface convex recesses, There is a problem that makeup may be deteriorated due to slipping up.

The present invention solves the above problems, and is a method for easily and reliably producing a puffing base material which is excellent in flexibility and cosmetic properties and has no peeling between the base material layer and the surface layer. The purpose is to provide.

[0006]

The method for producing a puff substrate according to the present invention comprises a water-soluble rubber latex emulsion and at least a vulcanizing agent on at least one surface of a closed-cell type molded sheet or molded plate-like body. , A surfactant, a thickener and a gelling agent are added, the pH is adjusted to 11.7 to 12.0, and a layer made of an open-cell latex composition in which air is mixed by stirring is formed, After that, this is heated and vulcanized.

Examples of the above-mentioned "rubber latex" component include NBR (acrylonitrile-butadiene rubber),
Examples thereof include latexes such as SBR (styrene-butadiene rubber), chloroprene rubber, butyl rubber, polybutadiene and polyisoprene. Of these,
It is preferable to use NBR which is excellent in weather resistance, oil resistance, hygiene (mainly the effect of suppressing the generation of microorganisms) and the like.

Examples of the above-mentioned "surfactant" include potassium oleate, sodium dodecyl sulfate, dodecyl trimethyl ammonium chloride, polyoxyethylene alkyl ether, N-alkyl-N, N-dimethyl ammonium betaine and the like. . The amount of this surfactant added is 1% solids in the latex emulsion.
0.30 to 100 parts by weight (hereinafter referred to as "part")
0.50 part is preferred. The amount of less than 0.30 part is because the latex composition is difficult to make uniform and the mixed air is difficult to disperse in a good state. on the other hand,
Even if it is added in an amount exceeding 0.50 parts, it is difficult to obtain a better dispersed state of air, and if finely foamed bubbles contain a large amount of surfactant, the surface tension of the bubbles becomes weak. , Bubbles are connected to each other, and large bubbles are increased. In addition, a large bubble causes roughness in the foam and causes poor cosmetic properties.

Examples of the above-mentioned "thickener" include sodium alginate, sodium polyacrylate, ammonium polyacrylate, polyvinyl alcohol and the like. Further, the addition amount of this thickener is 0.01 to 0.1 with respect to 100 parts of solid content in the latex emulsion.
0 part is preferred. When the amount of this thickener is less than 0.01 part, the thickening effect is not sufficient, and it is difficult to stabilize the bubbles in the latex composition so that they do not collapse. This is because even if the amount added exceeds parts by weight, the thickening effect is high and even if air is introduced and stirred, it is difficult to form uniform fine bubbles.

Examples of the above-mentioned "gelling agent" include sodium silicofluoride, potassium silicofluoride and the like. Furthermore, as described above, the pH of the latex composition is adjusted to 1
The reason for adjusting the range of 1.7 to 12.0 is that this promotes gelation of the latex composition. That is, when a gelling agent (pH 5 to 6) is added to an alkaline latex having a high pH, the pH of the dispersion system drops sharply, so that the gelling effect is large (it easily hardens). Therefore, it is possible to gelate the fine bubbles as they are at the time of foaming. Further, when the latex pH is low, the gelling effect is poor and the bubbles are connected to form a large bubble as described above before the bubbles are gelled. The method of adjusting the pH is not particularly limited, and examples thereof include a method of adding a predetermined amount of an aqueous solution of potassium hydroxide, sodium hydroxide or the like.

Further, the stirring speed is preferably 160 rpm or more. This is to improve the dispersion of the air mixed in the latex composition. The expansion ratio of the open cell surface layer is preferably 9 to 11 times. This is because if the expansion ratio is less than 9 times, the puffing base material becomes too hard, and if the expansion ratio exceeds 11 times, the air mixed in the latex composition is rather dispersed poorly. Further, the water-soluble rubber latex emulsion additives include, in addition to the vulcanizing agent and the surfactant, a vulcanization aid, a vulcanization accelerator, if necessary.
Antiaging agents, softening agents (for example, phthalates such as dioctyl phthalate, dibutyl phthalate, etc.) can be added.

[0012]

In the formation of the surface layer in the present invention, a surfactant, a thickener and a gelling agent are added and the latex is brought to a predetermined pH. Therefore, when air is mixed by stirring, this air dispersion Is better, the viscosity is higher, and the gelation rate is faster, so that fine bubbles gel before they grow into large bubbles. Therefore, it can be gelled while holding the connection (growth) of bubbles with fine bubbles,
The bubbles in this composition are stable and prevented from collapsing.

Further, a layer made of the latex composition for continuous cells is formed on a closed cell type molded sheet or the like, and then this layer is heated and vulcanized. Therefore, since the independent foaming type surface layer is integrally formed on this base material layer, there is no peeling between both layers, and it is made of the same kind (similar material), so that there is no discomfort. Furthermore, it is possible to continuously produce a puff base material,
Moreover, the labor of the bonding work can be saved, and the desired puff can be easily manufactured by punching into a desired puff shape.

[0014]

EXAMPLES The present invention will be specifically described below with reference to examples. (1) Preparation of test piece First, a closed-cell shaped plate-shaped body is prepared. It is manufactured as follows.

That is, the latex composition for closed cells shown below was prepared. In addition, this numerical value is the value which converted each component into solid content. (1) Nitrile rubber (NBR) ["JSRN230S
V "(acrylonitrile product in acrylonitrile butadiene rubber, acrylonitrile content 25% by weight (hereinafter referred to as"% ") manufactured by Nippon Synthetic Rubber Co., Ltd.] 10
0 parts by weight (hereinafter referred to as "part") (2) Vulcanizing agent: sulfur 2.5 parts (3) Accelerator: di-2-benzothiazyl disulfide (DM) 0.5 part (4) Blowing agent: pp'-oxybisbenzenebenzenesulfonyl hydrazide (OBSH) 3.5 parts (5) Foaming aid: urea 2.0 parts (6) Vulcanization accelerator aid: stearic acid 3.0 parts (7) Addition Sulfurization aid: Zinc oxide 3.0 parts (8) Colorant: Titanium white 25 parts (9) Plasticizer: Liquid nitrile rubber (liquid NBR, concentration 5
0%) 30 parts (10) UV absorber (“Sumisolve # 200”, manufactured by Sumitomo Chemical Co., Ltd.) 2.0 parts (11) Anti-aging agent (2,2-methylene-bis-4-methyl-6-) 1.5 parts of tertiary butylphenol (trade name "Nocrac NS-6", manufactured by Ouchi Shinko Chemical Co., Ltd.)

This raw material composition is 300 mm long and 300 mm wide.
mm and a depth of 14 mm were filled at a filling rate of 100%, and primary vulcanization was performed at a temperature of 125 ° C. for 20 minutes to give a semi-vulcanized state. After that, secondary vulcanization was performed at 135 ° C for 20 minutes, then the molded product was taken out and sliced at a position of about 2 mm from the upper and lower surfaces using a slicer cutting machine, and the upper and lower surfaces (both surface layers) were cut off. Then, a plate-like body having a thickness of 8 mm was formed.
This plate-like body had a closed cell structure (average cell diameter; 0.2 to 0.5 mm, density;
0.2 g / cm ³ ). Next, latex compositions according to Example 1 and Comparative Example 1 having the compositions shown in Table 1 were prepared. Incidentally, this numerical value is also a value obtained by converting each component into a solid content. The expansion ratio is adjusted by the amounts of the foaming agent, the foaming aid, the amount of the plasticizer, and the vulcanization conditions.

[0017]

[Table 1]

The following compositional components were used in this table. (1) "NBR-531-B" (high acrylonitrile water-based emulsion, manufactured by Nippon Zeon Co., Ltd.) (2) "NBR 531" [water-based emulsion of acrylonitrile product in acrylonitrile butadiene rubber (acrylonitrile content 25%) , Concentration: 65%, manufactured by Nippon Zeon Co., Ltd.] (3) “Powdered sulfur” (manufactured by Hosoi Chemical Co., Ltd.) (4) Zinc salt of mercaptobenzothiazole as a “promoter” (trade name “NOXCELLER MZ”, Ouchi (5) "Zinc oxide" (manufactured by Shiramizu Chemical Co., Ltd.) (6) "Anti-aging agent" (the above 2,2-methylene-bis-)
4-methyl-6-tertiarybutylphenol) (7) Potassium oleate as potassium oleate soap (manufactured by Kao Corporation) (8) Reaction product of chlorinated formaldehyde and ammonia (trade name "Trimenbase", Uni (Royal Co., Ltd.) (9) "Sodium alginate" (reagent grade 1) [3.3% aqueous solution] (10) "Sodium fluorosilicate" (Mitsui Toatsu Chemicals, Inc.)

Next, a predetermined amount of a 10% aqueous solution of potassium hydroxide was added to this composition to adjust the pH value to 12. The pH before the pH adjustment is 11.5 (Comparative Example 1). Then, after mixing air into each composition,
Stirring was performed at a mixing speed of 180 rpm with a Kenmix mixer (rotating whisk, manufactured by Aikosha Seisakusho Co., Ltd.). The amount of air differs depending on the desired expansion ratio.

Then, as shown in FIG. 1, the aerated composition 2 is injected onto the closed cell type molded plate 1 placed on the conveyor 3 for transportation. The closed-cell type molded plate-shaped body 1 is successively placed on the conveyer 3 for conveyance and conveyed. And about 10m from the surface of this plate
Doctor knives (blades) are arranged at intervals of m. Along with the rotation of the transporting conveyor 3, a layer (film) having a thickness of about 5 mm is applied and formed. The layer can also be formed by using a roller coater or a bar coater. This is continuously transferred, put in the heating chamber 5, and heated air (150 ° C.) is caused to flow from above and below to be vulcanized for 20 minutes to manufacture a puff base material. After that, as shown in FIG. 2, the upper and lower surfaces are sliced using a slicer slicer 6,
Further, the puff was manufactured by cutting with a Thomson blade so as to have a predetermined size (50 × 50 × 8 mm) and further polishing the side surface with a rotary grindstone. In addition, this surface layer is
When observed with a 100-fold microscope, it has an open cell structure (average cell diameter: 0.1 to 0.5 mm, density: 0.12 g / cm).
³ ) showed.

(2) Evaluation of test pieces First, the hardness and density of each test piece were examined. Their values
It is also shown in Table 1. The hardness is a value measured using an F type hardness meter. Furthermore, the appearance of each test piece and the feel when touching the skin were examined, and appropriateness was evaluated as a puff base material with reference to these. These results are also shown in Table 1.

In the evaluation of "appearance" shown in Table 1, "○" means "good appearance" and "△" means "slightly inferior appearance with pinholes". As for the evaluation of "feel", "○" means "feels good on the skin" and "△" means "feels slightly lacking in flexibility and feels hard and cold".
Furthermore, in the evaluation regarding "makeup appropriateness", "○" is "suitable for base material for puff", and "△" is "a little inconvenient as a puff" (that is, it has a bad texture and a stiff rigidity, The material enters the foam of the sponge and cannot be applied to the skin, and the rigidity of the foam remains on the skin as makeup lines. "

Judging from the above results, Comparative Example 1
Both hardness and density show excessive values, there are pinholes in the appearance, the feel is hard and cold, and even with proper makeup, it is possible to apply makeup and fine control of makeup blur, skin wrinkle etc. It can be seen that it is a little unsuitable as a base material. On the other hand, in Example 1, the bubbles are fine, the hardness is 35 °, and the density is 0.12 g / c.
Since it is m ³ , it has good softness, softness, and skin feel, and is comfortable to use and has a good appearance. The hardness is about 30 to 50 ° and the density is 0.10 to 0.13 g / cm.
Even if it is about ³ , it has excellent flexibility. In addition, in this Example 1, the interfaces of both layers were firmly bonded and did not peel off even when pulled, and even when this puff was used, there was no sense of incongruity such as that the interfaces were hard. There wasn't.

On the other hand, as Comparative Example 2, the above plate-shaped body (having the same thickness as the above) was cut into the same shape, and the closed-cell type sheet (thickness: 1.5 mm) produced under the same conditions as above. And an adhesive (NBR type, "Diabond # 1801", manufactured by Diabond Industry Co., Ltd.,
200-600 cps) was used for bonding to produce a puff. This adhesion process was complicated, and the adhesive layer felt uncomfortable when the puff was used.

The present invention is not limited to the specific examples described above, and various modifications may be made within the scope of the present invention depending on the purpose and application. That is,
The puffing base material is usually cut into a desired shape, punched, chamfered at the corners, and processed into a puff. Further, the shape, size, etc. of the puffing base material are not particularly limited, and are variously selected according to the purpose, application and the like.

[0026]

According to the manufacturing method of the present invention, since the liquid foundation does not penetrate into the closed cell layer, the foundation is transferred to the skin well, and the continuous cell layer prevents upslip and delicate makeup such as blurring of the makeup line. It is possible to manufacture a base material for puffs which can control the cosmetic composition and improve the cosmetic properties. still,
This effect can be applied to eye shadow chips as well as puffs, and similar effects can be expected. Further, since both layers are integrated by vulcanization, unlike conventional bonding with an adhesive, there is no peeling from the interface between both layers, and there is no discomfort in the conventional adhesive layer. Furthermore, according to the present manufacturing method, it is possible to easily and surely manufacture a puff that matches the current needs of consumers and has a good appearance, flexibility, softness, skin contact, etc. and is comfortable to use.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for manufacturing a puff base material in an example.

FIG. 2 is an explanatory diagram showing a state in which the upper and lower surfaces of the puffing base material are sliced in the example.

[Explanation of symbols]

1; Molded plate-like body, 2; Aerated composition, 3; Conveyor, 4; Doctor knife, 5; Heating chamber, 6; Cross-section slicer.

Claims (1)

[Claims] 1. A pH is obtained by adding at least a vulcanizing agent, a surfactant, a thickener and a gelling agent to a water-soluble rubber latex emulsion on at least one surface of a closed-cell type molded sheet or molded plate-like body. Is adjusted to 11.7 to 12.0 and air is mixed by stirring to form a layer composed of an open-cell latex composition, and then the layer is heated to be vulcanized. Method of manufacturing wood.