JPH0631439B2 - Method for producing natural leather having far infrared radiation characteristics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a far-infrared ray that radiates far-infrared ray radiant energy to natural leather which is a material for shoes, gloves, clothes, hats and the like worn by humans. The present invention relates to a method for producing natural leather having radiation characteristics.

[Prior Art] Conventionally, there has been no natural leather that radiates far infrared radiation energy.

[Problems to be Solved by the Invention] As described above, since no natural leather that radiates far-infrared radiant energy has ever existed, all natural leathers up to now do not have far-infrared radiation characteristics. Therefore, far-infrared radiation energy is not radiated, so that it is not possible to expect any blood circulation promotion, heat retention effect, metabolism promotion, and other medical effects and health promotion effects due to the hyperemic action obtained by irradiation of far infrared rays. There was a point.

The present invention is intended to provide a method for manufacturing natural leather having far-infrared radiation characteristics, which is intended to solve the above problems.

[Means for Solving the Problem] In the present invention, the far-infrared emissivity at 30 ° C. has a wavelength of 4.5.
The above problems were solved by adopting a manufacturing method of impregnating the raw leather with ceramic particles having a far infrared radiation property of which the average is 65% or more in the region of up to 30 μm.

[Function] Far-infrared radiation energy is radiated from the ceramics impregnated in the natural leather manufactured by the above-described manufacturing method even at room temperature. For example, when the natural leather is applied to a shoe, it is covered with the heat of the foot inside the shoe. When the temperature rises, far-infrared radiation energy with better emissivity is emitted from the ceramics.

[Examples] To explain the production method of the present invention, the gist of the present invention is to impregnate ceramic particles having far-infrared radiation characteristics into natural leather with a dispersant.

That is, in the present invention, it is essential that the natural leather is impregnated with the ceramic particles having the far-infrared radiation characteristic. Therefore, the substance having the far-infrared radiation characteristic will be described first.

Although there are various substances having far-infrared emission characteristics, the substance having far-infrared emission characteristics that can be used in the present invention has a far-infrared emissivity at 30 ° C. of 65% or more on average in the wavelength range of 4.5 to 30 μm. Is required, preferably 7
It is 5% or more, and particularly preferably 90% or more.

Examples of the substance having far-infrared radiation characteristics include oxide-based ceramics, non-oxide-based ceramics, non-metals, metals, alloys and crystals. For example, as oxide-based ceramics, alumina (Al ₂ O ₃ ) -based, magnesia (M
gO) type, zirconia (ZrO ₂ ) type, titanium oxide (TiO ₂ ), silicon dioxide (SiO ₂ ), chromium oxide (Cr ₂ O ₃ ), ferrite (FeO ₂ , Fe)
₃ O ₄ ), spinel (MgO · Al ₂ O ₃ ), cerium (CaO ₂ ), barium (BaO), and the like, and the carbide ceramics include boron carbide (B ₄ C), silicon carbide (SiC), and carbon carbide. Titanium (TiC), molybdenum carbide (MoC), tungsten carbide (WC), etc. are available, and nitride ceramics include boron nitride (BN), aluminum nitride (AlN), silicon nitride (Si ₃ N ₄ ), and zircon nitride nitride. (ZrN) and the like, non-metals include carbon (C) and graphite, and metals include tungsten (W), molybdenum (Mo), vanadium (V), platinum (Pt), tantalum (Ta), manganese ( Mn), nickel (Ni), copper oxide (Cu ₂ O), iron oxide (Fe ₂
O ₃ ), alloys include nichrome, canthal, stainless steel, and alumel, and crystals include mica, fluorite, calcite, alum, quartz, and the like.

FIG. 1 is a far-infrared emissivity distribution map. Curve A is an alumina-based spectrum, curve B is a magnesia-based spectrum, and curve C is a zirconia-based radiation spectrum. The average emissivity is 75% or more in the wavelength region of 4.5 to 30 μm, which can be adopted in the present invention. Curve D is the emission spectrum of zircon carbide (ZrC) of non-oxide carbide ceramics, and curve E is the emission spectrum of titanium nitride (TiN) of non-oxide nitride ceramics. It has an average emissivity of 60% or less and cannot be used alone in the present invention. Curve F is the emission spectrum of transparent quartz ceramics. Its average emissivity is 40% or less and cannot be used alone in the present invention.

Far-infrared emissivity can be obtained by measuring the spectrum as described above, but emissivity depends on the substance and its purity, particle size or crystal system, tetragonal, hexagonal, unilateral, cubic, trigonal, orthogonal, etc. It is decided.

Alumina-based, magnesia-based, and zirconia-based ceramics are particularly useful ceramics having far-infrared radiation characteristics. If this is further subdivided, alumina and mullite are used for alumina, magnesia and cordierite for magnesia, and zircon sand (ZrO ₂ · S for zirconia).
iO ₂ ), zircon (ZiO ₂ ) and the like. It is also effective to mix and use one kind or two or more kinds selected from the above group, and it is also effective to mix and use one kind or two or more kinds selected from the above group. It is also effective to use a mixture of one or more selected from the above groups and other ceramics (for example, a carbide-based ceramic).

Fig. 2 shows an example of the emissivity when the composite ceramics are used together. A curve G in FIG. 2 shows the emissivity of the composite ceramic in which zirconia (ZrO ₂ ) and chromium oxide (Cr ₂ O ₃ ) are mixed at 1/1, and a curve H in FIG. 2 shows alumina (Al ₂ O _3). ) And magnesia (MgO) at a ratio of 1/1, the emissivity of the composite ceramics is shown, and both are useful in the present invention.

The higher the purity of the particles having the far-infrared radiation characteristics as described above, the more preferable it is, and a high emissivity is often obtained when the purity is 95% or more. For example, FIG. 3 shows the emissivity when the purity of alumina is 95% (curve I) and 85% (curve J), and FIG. 4 shows the purity of mullite of 95%, respectively.
(Curve K) and 85% (curve L) show the emissivity, and the higher the purity, the higher the emissivity.

Thus, as described above, the ceramic particles having far-infrared radiation characteristics that can be particularly adopted in the present invention are alumina-based, magnesia-based, and zirconia-based oxide-based ceramics, which may be used alone or in combination. It is preferable to use.

Next, the step of impregnating the natural leather with the ceramic particles having the preferable far-infrared radiation characteristics will be described in detail.

First, the first step is the step of soaking the raw hide in water. This is to immerse the hide in a washing water of 15 to 20 ° C. using a drum (paddle), and to soak dirt and peeled hide in the saline solution tank to preserve the hide and impregnate the hide. The salt content and water-soluble proteins in the skin are washed, removed, and eluted to absorb and soften the water to form a rawhide.

Then, the raw leather softened in the first step is applied to a backlining machine to remove the subcutaneous tightening tissue, fat, meat pieces and the like, which is a second step of facilitating the impregnation of the ceramic particles having the far-infrared radiation characteristics (backlining ( Enter the freshening process.

Next, the raw leather that has undergone the second step is added to an aqueous solution in which the ceramic particles having the far-infrared radiation characteristics are mixed, and a hair removal accelerator for removing animal hair and a dispersant for enhancing the dispersion effect of the ceramic particles, which are not particularly limited. The third step, which is a primary impregnation step of ceramic particles, is to impregnate the raw leather with ceramic particles having far-infrared radiation characteristics by immersing in a solution in which dispersants each consisting of an alkylbenzene sulfonate are mixed. to go into. The concentrations of the ceramics and the dispersant in the aqueous ceramic solution in the third step are preferably the concentrations in the first impregnation step in Table 1.

Then, after further passing through a squeezing step which is a fourth step of manual work for removing fine hairs, root hairs, pieces of meat and oily matter remaining on the raw leather impregnated with the ceramic particles having the far-infrared radiation characteristics by the third step, In order to improve the far-infrared radiation efficiency, the second step is the second step of impregnating the raw leather again with the ceramic particles, which is substantially the same step as the third step.
Enter the process. That is, in this second impregnation step, the depilation promoter mixed in the solution of the first impregnation step is unnecessary, and the concentrations of the ceramics and the dispersant in the other aqueous solution of the ceramic particles are as shown in Table 1 above. It is recommended to use the concentration of the secondary impregnation step.

Upon completion of the fifth step, the keratose, elastin, fat, etc., which are unnecessary for leather production, are treated with proteolytic enzymes in order to leach them, and then undergo a sixth step of imparting flexibility to the skin. Depending on the use and purpose, it is treated with a tanning process such as chrome tanning and tannin tanning to obtain leather.

Experimental Example An experimental example of the present invention is shown below.

A pig skin having a thickness of 1 mm was used to impregnate a ceramic having far infrared radiation characteristics under the test conditions shown in Table 2 below. The temperature at the time of impregnation was room temperature, the temperature of the water used was 15 ° C., and the pork skin was impregnated in the impregnating solution in a stationary state.

As a result of impregnating the pig skin with the above-mentioned test conditions, the whole pig skin having a thickness of 1 mm was impregnated with the ceramic.

Then, the weight change between the leather in which the pig skin (natural leather) is impregnated with ceramics and the ordinary natural leather not impregnated with ceramics and the far-infrared effect in thermometry are compared. The results shown in Table 4 were obtained.

The weight change of the natural leather according to the present invention according to the above Table 3 is an increment due to the impregnation of the ceramics, and the thermo measurement according to Table 4 is that the surface temperature of the hot plate is 33 ° C. and the leather is set on the surface of the far infrared ray. When the effect was measured by thermography, the temperature difference was 1 ° C. This is the far infrared effect.

Furthermore, FIG. 5 shows a heat retention state comparison diagram in which the heat retention states of the natural leather according to the present invention and general-purpose natural leather were tested. In the figure, M is the natural leather according to the present invention and N is a general-purpose natural leather. is there. In addition, "1 claw" is here what displays the heat retention power which a person is comfortable at the temperature of 21 degreeC. And
It can be seen from FIG. 5 that the natural leather according to the present invention has a higher heat retention than general-purpose natural leather.

Further, FIG. 6 is a distribution chart showing the emissivity of the natural leather according to the present invention and general-purpose natural leather, in which O indicates the emissivity of the natural leather of the present invention, and P indicates the emissivity of general-purpose natural leather. The results show that the natural leather of the present invention has an excellent far-infrared emissivity.

[Advantages of the Invention] Since the present invention is as described above, since the natural leather obtained by the production method of the present invention is impregnated with the ceramic particles having far-infrared radiation characteristics, far-infrared radiation is emitted even at room temperature. For example, when this is applied to shoes, if the temperature of the inside of the shoes rises when the shoes are worn, far infrared radiant energy with better emissivity is radiated from the ceramics, and as a result, blood circulation is promoted and heat retention due to hyperemia. Effects, promotion of metabolism, other medical effects and health promotion effects can be expected, and in particular, the natural leather according to the present invention is applied to the outside of the shoes worn by humans, gloves, clothes and hats, The far infrared radiation energy effect can be fully utilized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a distribution chart showing the far infrared emissivity of ceramics,
Fig. 2 is a distribution chart showing the emissivity of composite ceramics, and Fig. 3
FIG. 4 is a distribution chart showing the emissivity of alumina, FIG. 4 is a distribution chart showing the emissivity of mullite, FIG. 5 is a heat retention state comparison diagram of the natural leather according to the present invention and general-purpose natural leather, and FIG. 6 is It is a distribution diagram which shows the emissivity of the natural leather which concerns on this invention, and a general-purpose natural leather.

Claims (1)

[Claims] 1. The far infrared emissivity at 30 ° C. has a wavelength of 4.
A method for producing a natural leather having far-infrared radiation characteristics, which comprises impregnating a raw leather with ceramic particles having a far-infrared radiation characteristic of 65% or more in an area of 5 to 30 μm using a dispersant.