JPH0615659A - Production of latex foam with microfine foams - Google Patents

Abstract

PURPOSE:To obtain a latex foam production method by which a foaming magnification can be increased, foams can be uniformly formed, and a foam of a required diameter, esp. an extreamly small diameter, can be formed. CONSTITUTION:A latex foam is formed by mixing a compounded latex with air by stirring by a first mixing head 1. The latex foam discharged from the first mixing head 1 is successively supplied to at least two mixing heads 2, 3 to be repeatedly stirred and mixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a step of injecting mixed latex such as various rubber / resin latex with a mixing head to stir / mix, and further to cast the mixed latex containing air into a mold. The present invention relates to a method for producing a latex foam having extremely fine cells, which comprises a step of solidifying.

[0002]

2. Description of the Related Art Conventionally, an oak mixer is generally used for producing a latex foam by foaming and molding various rubbers and compounded latices such as resin latices by the Dunlop method. Explaining the method, first, the compounded latex stored in the tank is sent to the mixing head part by a pump, air is added (may be added before sending), and if necessary, a vulcanization activator and a slow coagulant are added. Add, stir and mix to foam. In this case, one or two mixing heads are used. Then, the foamed compounded latex is taken out from the mixing head, cast into a mold, completely solidified, and then vulcanized according to the formulation, demolded, washed with water, and dried to form a latex foam of the product. obtain.

However, in the above-mentioned conventional method, the expansion ratio cannot be increased to 5.3 to 5.5, and if the expansion ratio is higher than that, uniform cells cannot be formed, and the expansion ratio is 4.3 to 5.3. However, there is a problem that it is not possible to form a desired bubble diameter such as formation of extremely fine bubbles, and it is not possible to form a desired bubble diameter.

[0004]

The problems to be solved are that the expansion ratio cannot be increased to form uniform cells, and that a desired cell diameter, particularly ultrafine cells, is formed. Is something that cannot be done.

[0005]

According to the present invention, the first mixing head 1 stirs and mixes the compounded latex and air,
The step of forming a latex foam is such that the latex foam discharged from the first mixing head 1 is successively supplied to at least two mixing heads 2 and 3 and repeatedly stirred and mixed.

[0006]

EXAMPLES Examples will be described with reference to the drawings.
Reference numeral 1 denotes a first mixing head, which comprises a first blended latex supply port 1a, a vulcanization activator charging port 1d, an air blowing port 1e, and a first latex foam discharging port 1b. 2 is a second mixing head, which is a second blended latex foam supply port 2a, a slow coagulant injection port 2d, a second
The latex foam outlet 2b is provided. 3 is the third
The mixing head includes a third blended latex foam supply port 3a and a third latex foam discharge port 3b. 1c is a first transport pipe connecting the first latex foam discharge port 1b and the second latex foam supply port 2a, and 2c is a second latex foam discharge port 2b and a third latex pipe.
It is a second transportation pipe connecting to the latex foam supply port 3a.

The operation will be described. First, the first mixing head 1 stirs and mixes the mixed latex and air to form a latex foam, and the latex foam discharged from the first mixing head 1 is mixed with the second mixing head. 2 and stir and mix. The second below
The latex foam discharged from the mixing head 2 of FIG.
Then, the mixture is repeatedly stirred and mixed, and then poured into a mold to produce a latex foam having ultrafine bubbles.

[0008]

Since the present invention is constructed as described above,
The expansion ratio capable of forming uniform cells can be significantly increased to 7.0 to 7.2 for NBR latex, for example. In addition, under the same conditions, it is possible to produce sponge foams having extremely fine cells smaller than the average cell diameter by 30% or more under the same conditions, at the foaming ratio of 4.3 to 5.3 used in the production of ordinary cosmetic sponge puffs. Therefore, by changing the number of mixing heads with the same composition, latex foams having different desired cell sizes can be produced. For the above reason, the vulcanization activator / slow coagulant can be added to the first and second mixing heads 1 and 2 separately, the dispersion of the medicine becomes good, and the mixing heads 3 and subsequent stirring / When combined with mixing, a higher degree of dispersion of both drugs becomes possible, which has a great effect on stable molding of bubbles.

[Brief description of drawings]

FIG. 1 is an apparatus configuration diagram showing a configuration of an apparatus used in the present invention.

[Explanation of symbols]

 1 Mixing Head 1a First Blended Latex Supply Port 1b First Latex Foam Discharge Port 1c First Transport Pipe 1d Vulcanization Activator Input Port 1e Air Blowing Port 2 Mixing Head 2a Second Latex Foam Supply Port 2b Second Latex Foam Form Discharge port 2c Second transport pipe 2d Slow coagulant injection port 3 Mixing head 3a Third latex foam supply port 3b Third latex foam discharge port

Claims (1)

[Claims] 1. A first mixing head comprising a first blended latex supply port (1a), a vulcanization activator charging port (1d), an air blowing port (1e), and a first latex foam discharging port (1b). Stir the compounded latex and air in (1).
The step of mixing to form a latex foam, the latex foam discharged from the first mixing head (1), the second latex foam supply port (2a), the slow coagulant injection port (2d), the latex foam discharge port (2b) ) Is supplied to a second mixing head (2) for stirring and mixing, the latex foam discharged from the second mixing head (2) is supplied to a third latex foam supply port (3a), a third latex foam. Ultrafine comprising a step of supplying to at least one mixing head after the third mixing head each having a discharge port (3b) and repeatedly stirring and mixing, and casting the stirred and mixed latex foam into a mold. A method for producing a latex foam having cells.