JP2006335919A - Genuine leather and its preparation process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a genuine leather (processed natural leather) excellent in sound absorption property and sound insulation property and its preparation process. <P>SOLUTION: The genuine leather 1 is characterized in that, in the grain side fiber layer 2 of the natural leather, there are dispersed or fixed the bell type microcapsules 4 that occlude in the capsules fine particles and/or a liquid that can move independently of the capsules. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to genuine leather (processed natural leather) excellent in sound absorption and sound insulation and a method for producing the same. In particular, the present invention relates to genuine leather suitable for automobile seats that require sound absorption and sound insulation and a method for producing the same.

  Conventionally, genuine leather obtained by processing natural leather has been used as a seat material for automobiles, particularly luxury cars. The performance required for automobile seat materials includes vibration damping, soundproofing, and sound absorbing properties that block and absorb vibrations and noise transmitted from the engine and outside the vehicle. In particular, sound absorption has come to be considered important in automobiles with limited capacity.

  Conventionally, perforation processing has been performed in order to impart sound absorption to genuine leather for automobiles. In order to give sound absorption performance to genuine leather, a gap for sound air vibration to propagate was necessary, and numerous holes were made. However, opening innumerable holes on the surface of genuine leather by perporation processing not only deteriorates physical properties such as strength of genuine leather, but also deteriorates aesthetics and luxury.

On the other hand, in Patent Document 1 below, for the purpose of reducing the influence of a sudden change in the outside air temperature and obtaining a synthetic leather having a stable feeling of use, a specific layer is included in the coating layer mainly composed of an elastic polymer. Synthetic leather containing microcapsules encapsulating a phase change material is disclosed. However, there is no mention of improving the sound absorption performance of genuine leather.
JP 2002-242082 A

  An object of the present invention is to improve the sound absorption performance of genuine leather used for automobile seats and the like.

  The inventors of the present invention have found that the above-mentioned problems can be solved by incorporating a sound absorbing / damping / soundproofing material having a specific structure in the silver surface layer of natural leather, and have reached the present invention.

  That is, firstly, the present invention is an invention of genuine leather having sound absorbing performance, and fine particles and / or liquid that can move independently of the pores in the pores (capsules) on the silver surface fiber layer of natural leather. The bell-shaped microcapsules enclosing the are dispersed or fixed.

  The bell-shaped microcapsule absorbs vibration of sound and converts it into kinetic energy in the pores (capsules) by the fine particles and / or liquid encapsulated in the pores (capsules). Demonstrate vibration and sound insulation.

  Specifically, it is preferable that the bell-shaped microcapsules are dispersed or fixed together with a tanning agent or a greasing agent in a silver surface fiber layer of natural leather.

Various types of bell-shaped microcapsules can be used. For example, the following examples are given.
1) The fine particles encapsulated in the bell-shaped microcapsule are inorganic fine particles, and the inorganic fine particles are one or more selected from metals, metal oxides, alloys, magnetic fine particles, ceramics, and glass.
2) The liquid contained in the bell-shaped microcapsule is a magnetic fluid.
3) The case where the fine particles and liquid contained in the bell-shaped microcapsule are magnetic fluids in which inorganic fine particles are dispersed in an organic medium.
4) When the outer shell of the bell-shaped microcapsule is made of a synthetic resin.
5) When the outer shell of the bell-shaped microcapsule is made of an inorganic substance such as ceramics or glass.

  The genuine leather of the present invention is excellent in sound absorbing property, sound insulating property, and vibration damping property because the vibration energy of sound is converted into the kinetic energy of fine particles and / or liquid in the bell-shaped microcapsules.

  In the present invention, it is preferable that the fine particles encapsulated in the bell-shaped microcapsules have an average particle diameter of 5 to 500 nm and a specific gravity of 1.0 to 5.0 in order to exhibit sufficient sound absorption and sound insulation.

  In the present invention, the bell-shaped microcapsule has an average particle diameter of the outer shell (shell) of 5 to 500 μm and a thickness of the outer shell of 0.1 to 1.0 μm. From the viewpoint of balance with the fine particles and / or liquid contained in the liquid.

  Secondly, the present invention is an automobile seat made of the above-described genuine leather. The automobile equipped with the genuine leather of the present invention is excellent in sound absorption, vibration suppression and soundproofing, and creates a comfortable interior space.

Third, the present invention is an invention of a method for producing genuine leather,
1) A natural tanning agent in which bell-shaped microcapsules containing fine particles and / or liquid that can move independently of the pores in the pores (capsules) are dispersed in the retanning step in the leather manufacturing process. To adhere to the silver surface fiber layer of leather,
2) A greasing agent in which bell-shaped microcapsules containing fine particles and / or liquid that can move independently of the pores in the pores (capsules) in the greasing step in the leather manufacturing process are dispersed, Adhere to the silver surface fiber layer of natural leather,
It is characterized by that.

  As a specific method for attaching the tanning agent or greasing agent to the silver surface fiber layer of natural leather, spraying, dipping or gravure of the tanning agent or greasing agent is preferably exemplified.

  The kind, particle size, specific gravity, encapsulated liquid, encapsulated microparticles and liquid, the particle size of the outer shell of the bell microcapsule, the thickness of the outer shell, etc. are the same as above. It is.

  The genuine leather of the present invention can be used for various applications by taking advantage of the excellent sound absorption, sound insulation and vibration control properties exhibited by the bell-shaped microcapsules. In particular, it is suitable as an automotive sheet material.

  In FIG. 1, bell-shaped microcapsules containing fine particles and / or liquid that can move independently of the pores are dispersed or fixed in the silver surface fiber layer of natural leather of the present invention. An enlarged cross section of the genuine leather is schematically shown.

As shown in FIG. 1, a genuine leather 1 has a silver surface fiber layer 2 of natural leather and a coating film 3 made of a base coat, a color coat, a top coat, and the like. In some cases, the back surface of the silver surface fiber layer 2 has a foreign matter adhesion preventing film. In the present invention, bell-shaped microcapsules 4 containing fine particles and / or liquid that can move independently of the pores are dispersed or fixed in the silver surface fiber layer 2 of natural leather. The vibration energy of the sound is converted into kinetic energy of inorganic fine particles or the like in the bell-shaped microcapsules 4 and passes through the fiber entanglement of the silver surface fiber layer 2 of natural leather while being attenuated. As a result, it is considered that excellent sound absorbing properties, sound insulating properties, and vibration damping properties are exhibited.

  Generally, natural leather, such as cowhide, is subjected to a hair removal treatment or a tanning treatment. The base coat is a lowermost coating film formed by spraying an aqueous emulsion paint such as a mixed solution of acrylic and urethane as a base paint on the surface of the silver surface layer of natural leather. This base coat is formed mainly for the purpose of improving the adhesion between the silver surface and the color coat and making the surface for uniformly applying the color coat. The color coat is an intermediate layer coating film formed by spraying, for example, an aqueous emulsion paint as a base paint onto the surface of the base coat. This color coat is formed for the purpose of coating the leather in a color required for leather products manufactured by processing the leather and improving the strength of the entire coating film. The top coat is a coating film of the outermost layer formed by spraying a two-component reaction type aqueous emulsion paint on the surface of the color coat. Although the case of the three-layer coating film has been described, there is a case where either the base coat or the color coat is not applied, and the top coat is applied after the other is applied.

  Next, a method for finishing natural leather will be described. Conventionally, in the processing of natural leather, a finishing process is performed on the underlying leather after the steps of leather retanning, neutralization, dyeing, greasing and drying are completed. In the present invention, 1) Tanning microcapsules containing fine particles and / or liquid that can move independently of the pores are dispersed in the pores (capsules) in the retanning step in the leather manufacturing process. 2) Fine particles and / or liquid that can move independently of the pores in the pores (capsules) in the greasing step during the leather manufacturing process The greasing agent in which the bell-shaped microcapsules encapsulating is dispersed is adhered to the silver surface fiber layer of natural leather.

  In this invention, it does not restrict | limit especially as a capsule material which comprises the bell-shaped microcapsule attached to the silver surface fiber layer of natural leather. Specifically, acrylic, urethane, vinyl, styrene, and other synthetic resins, and inorganic substances such as glass are preferably exemplified.

  The material enclosed in the bell-shaped microcapsule is preferably inorganic particles such as alumina and cerium oxide, metal particles such as tungsten, tungsten oxide, and iron oxide, and magnetic fluid in which ferrite particles are dispersed in a hydrophobic organic solvent. Illustrated.

  In the present invention, the material of the inorganic fine particles included in the capsule is not particularly limited, and metal oxide fine particles, ceramic fine particles, metal fine particles, magnetic fine particles, and the like are used.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention in detail, this invention is not limited to these.

[Example 1]
Sample in which 10 to 20 wt% of bell-shaped microcapsules comprising a shell mainly composed of polyacrylonitrile are added to genuine leather for seats containing ferrite particles having an average particle diameter of 300 nm and a specific gravity of 4.0 to 5.0 Was made.

[Comparative Example 1]
Genuine leather for seats to which the bell-shaped microcapsules were not added was prepared.

[Evaluation results]
About the sample of an Example and a comparative example, the sound absorptivity was investigated with the following method. The evaluation method is as follows. The results are shown in Table 1 below.
Sound absorptivity: Sound absorption rate in a two-microphone sound absorption tube (cut to φ100-φ29)
Evaluation criteria: "Example 1" was evaluated with respect to "Comparative Example 1" according to the following criteria.
◎: Increase effect by 51% or more ○: Increase effect by 21-50% △: Increase effect by 0-20% ×: Decrease effect

  From the results in Table 1, it can be seen that the leather of the present invention in which the bell-shaped microcapsules are attached to the silver surface fiber layer of natural leather has improved sound absorption as compared with the case where the bell-shaped microcapsules are not attached.

  Whereas conventional genuine leather exhibits sound absorption by perporation processing, the present leather of the present invention has excellent sound absorption, sound insulation and vibration suppression without perforating the skin. Sex is demonstrated. Taking advantage of these characteristics, the leather of the present invention is used in various applications. For example, it is suitably used for automobile sheet materials.

The expanded cross section of the genuine leather which attached the bell-shaped microcapsule of this invention is shown typically.

Explanation of symbols

1: Genuine leather, 2: Silver leather fiber layer of natural leather, 3: Painted film, 4: Bell-shaped microcapsule.

Claims (12)

  A book characterized in that bell-shaped microcapsules containing fine particles and / or liquid that can move independently of the pores are dispersed or fixed in the silver surface fiber layer of natural leather. leather.   2. The genuine leather according to claim 1, wherein the bell-shaped microcapsules are dispersed or fixed together with a tanning agent in a silver surface fiber layer of the natural leather.   The genuine leather according to claim 1, wherein the bell-shaped microcapsules are dispersed or fixed together with a greasing agent on a silver-faced fiber layer of the natural leather.   The fine particles encapsulated in the bell-shaped microcapsule are inorganic fine particles, and the inorganic fine particles are one or more selected from metals, metal oxides, alloys, magnetic fine particles, ceramics, and glass. Genuine leather according to any one of claims 1 to 3.   The genuine leather according to any one of claims 1 to 3, wherein the liquid contained in the bell-shaped microcapsule is a magnetic fluid.   The genuine leather according to any one of claims 1 to 3, wherein the fine particles and the liquid contained in the bell-shaped microcapsule are a magnetic fluid in which inorganic fine particles are dispersed in an organic medium.   The genuine leather according to any one of claims 1 to 6, wherein an outer shell of the bell-shaped microcapsule is made of a synthetic resin.   The genuine leather according to any one of claims 1 to 6, wherein an outer shell of the bell-shaped microcapsule is made of an inorganic substance.   An automobile seat comprising the genuine leather according to any one of claims 1 to 8.   In the retanning step in the genuine leather manufacturing process, a tanning agent in which bell-shaped microcapsules containing fine particles and / or liquid that can move independently of the pores are dispersed in the pores (capsules) A method for producing genuine leather, comprising attaching to a silver surface fiber layer.   In a greasing process in the genuine leather manufacturing process, a greasing agent in which bell-shaped microcapsules containing fine particles and / or liquid that can move independently of the pores are dispersed in pores (capsules) A method for producing genuine leather, comprising attaching to a silver surface fiber layer.   11. The method according to claim 10, wherein the method of attaching the tanning agent or greasing agent to the silver surface fiber layer of natural leather is selected from spraying, dipping, or gravure the tanning agent or greasing agent. 11. A method for producing genuine leather according to 11.

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