JP2010082536A - Genuine leather material and interior article of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a genuine leather material which has excellent texture, allows a coating film layer formed thereon by applying a coating material to have excellent adhesiveness and consists of split leather and to provide an interior article of an automobile, the epidermis of which is formed by using the genuine leather material. <P>SOLUTION: The interior article such as a steering wheel of the automobile includes: a base layer 11 consisting of the split leather; a filler layer 12 formed on the base layer 11 by applying a urethane coating material prepared by blending 3-7 parts mass silica filler having ≤0.1 μm particle size or 30-50 parts mass organic filler having ≤150 μm particle size in 100 parts mass polyol component; and the coating film layer 13 formed on the filler layer 12 by applying the urethane-based coating material, and has the epidermis formed by using the genuine leather material 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a genuine leather material and a vehicle interior product using the genuine leather material as a skin.

Conventionally, as a genuine leather material used for the skin of automobile interior parts, a paint such as urethane is directly applied to the surface (silver surface) of the leather having a skin layer to provide wear resistance, light resistance, and tactile sensation. Are used so as to satisfy the performance required for these products.
By the way, in addition to leather having a skin layer, genuine leather may be split in the horizontal direction in order to adjust the thickness of the leather, etc. The leather on the back side (which has a skin layer) There are floor leathers and the like.

  However, although this floor leather is cheaper than leather having a skin layer, the fibers constituting the leather are not dense like the skin layer, the density of the fibers is low, and the surface is porous. Therefore, if a paint such as urethane is applied directly to the surface like leather with a skin layer, the paint will penetrate into the inside of the leather and improve the performance such as wear resistance. In addition to being unable to do so, the texture was also impaired.

Patent Document 1 describes a so-called split leather in which a skin layer made of a polyurethane resin resembling a silver surface is bonded to the surface of a floor leather using a two-component cured polyurethane compounding adhesive.
Patent Document 2 discloses that a skin layer made of a polyurethane resin resembling a silver surface contains 25 parts by mass or more of an inorganic filler such as magnesium carbonate having an average particle size of 20 μm or more with respect to 100 parts by mass of the resin. A so-called split leather is described in which a two-component polyurethane resin is bonded to the floor leather surface using an adhesive in which a solvent is dissolved.
However, since such a split leather has a surface with a porous surface, and the skin layer is adhered to the floor leather with an adhesive, the skin layer may be peeled off due to friction during use, etc. A material using an adhesive containing a large amount of an inorganic filler becomes hard (see Comparative Example 3 of the present invention) and is unsuitable for use in the skin of automobile interior parts.
Patent Document 3 describes a composite material using thermocompression bonding with a thermoplastic film made of a vinyl chloride resin in order to bond a reinforcing fabric to floor leather. However, in order to paint the surface of this composite material to be a genuine leather material used for the skin of automobile interior parts, adhesion to the coating film, sealing effect (prevention of paint penetration) and abrasion resistance Etc. were insufficient.
JP 62-135600 A JP 7-242900 A Japanese Patent Laid-Open No. 3-26537

  Therefore, to provide a genuine leather material made of floor leather having a good texture and good adhesion of a paint film layer formed by coating a paint, and an automobile interior product using this genuine leather material for the skin. Objective.

In order to solve the above problems, the leather material of the present invention comprises a base layer made of floor leather,
A filler layer formed by applying a urethane coating containing 25 to 60 parts by mass of an organic filler or 2 to 10 parts by mass of an inorganic filler having a particle size of 0.15 μm or less to 100 parts by mass of the polyol component on the base layer; ,
It has the coating-film layer formed by apply | coating a urethane type coating material on the said sealing layer, It is characterized by the above-mentioned.

  In order to solve the above-described problems, the interior of an automobile according to the present invention uses the genuine leather material as a skin.

  The aspect of each element in the present invention is exemplified below.

1. Floor leather The floor leather, which is genuine leather from which the skin layer has been removed by splitting the genuine leather in the horizontal direction, is not particularly limited, but the thickness is preferably 0.8 to 3.0 mm. In addition, since automobile interior parts and the like used for the skin become gorgeous, it is preferable that at least the surface on which the sealing layer is provided is smooth by buffing or the like.
Moreover, as leather which becomes floor leather, although it does not specifically limit, cowhide, horse leather, pig leather, etc. can be illustrated.
Further, the base layer made of floor leather may be made of a single piece of floor leather, or may be made of a plurality of stacked floor leathers.

2. Urethane paints Urethane paints are not particularly limited, but since no solvent is used, the impact of the solvent on the environment is small, and the process can be simplified by non-heating. A so-called two-component type is preferred in which a coating film is formed by curing using a curing agent such as a component.
Moreover, the crosslinking agent which has an active hydroxyl group may be included, and catalysts, such as tertiary amine and metal soap, may be included.
Although it does not specifically limit as a coating method of a urethane coating, Spray coating, roll coater coating, etc. can be illustrated.
Although it does not specifically limit as a film thickness of the sealing layer formed by apply | coating urethane paint, It is preferable that it is 10-200 micrometers.

2-1. Polyol Component The polyol component used in the two-pack type urethane coating is not particularly limited, and examples thereof include polyether polyol and polyester polyol.
The hydroxyl value of the polyol component is not particularly limited, but is preferably 10 to 600 mgKOH / g. When the polyol component is a polyether polyol, the hydroxyl value is preferably 10 to 600 mgKOH / g, more preferably 20 to 500 mgKOH / g. On the other hand, when the polyol component is a polyester polyol, the hydroxyl value is preferably 30 to 400 mgKOH / g, and more preferably 40 to 300 mgKOH / g.

2-2. Curing Agent The isocyanate component contained in the curing agent is not particularly limited, but aliphatic, alicyclic isocyanate such as hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), hydrogenated diphenylmethane diisocyanate, lysine diisocyanate, 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), diphenylmethane diisocyanate (MDI), 1,5-naphthalene diisocyanate, tolidine diisocyanate, xylylene diisocyanate An aromatic isocyanate such as (XDI) or a polymer or derivative thereof can be exemplified.
Moreover, it is although it does not specifically limit as an amine equivalent of an isocyanate component, It is preferable that it is 50-400, More preferably, it is 100-300.
Here, the amine equivalent means the number of grams of the isocyanate component that reacts with a 1 gram molecule of a secondary amine to form a urea bond.

3. Inorganic filler The inorganic filler is not particularly limited, but is preferably a silica filler.
On the other hand, when the particle diameter exceeds 0.15 μm, the sealing effect is weakened, and is preferably 0.1 μm or less.
Moreover, if the compounding quantity to a urethane coating is less than 2 mass parts with respect to 100 mass parts of polyol components, the sealing effect will become weak and the texture of this leather material will worsen. If it exceeds 10 parts by mass, the leather material becomes hard. Preferably, it is 3-7 mass parts.

4). Organic filler Although it does not specifically limit as an organic filler, It is preferable that they are the leather particle filler which pulverized leather into the particle form, or the polyurethane resin particle filler which pulverized the polyurethane resin into the particle form.
Although it does not specifically limit as leather used for a leather particle filler, Cowhide, horse leather, etc. can be illustrated.
Although it does not specifically limit as a polyurethane resin used for a polyurethane resin particle filler, The waste material etc. of a polyurethane resin product may be sufficient.
The method for pulverizing leather and urethane resin is not particularly limited, and examples thereof include a method using a pulverizer such as a ball mill.
Although it does not specifically limit as a particle size of an organic filler, It is preferable that it is 200 micrometers or less, More preferably, it is 150 micrometers or less.
If the blending amount of the organic filler in the urethane coating is less than 25 parts by mass with respect to 100 parts by mass of the polyol component, the sealing effect is weakened and the texture of the genuine leather material is deteriorated. If it exceeds 60 parts by mass, the leather material becomes hard. Preferably, it is 30-50 mass parts.

5). Urethane paint The urethane paint is not particularly limited, and examples thereof include polyester urethane paint, acrylic urethane paint, and polycarbonate urethane paint. Moreover, what is called a one-component type which does not use a hardening | curing agent for formation of a coating film may be used, and what is called a two-component type which uses hardening | curing agents, such as an isocyanate component, for formation of a coating film may be used.
Although it does not specifically limit as an isocyanate component, The isocyanate component etc. which are contained in the hardening | curing agent of the said urethane coating material can be illustrated.
Although it does not specifically limit as a coating method of a urethane type coating material, Spray coating, roll coater coating, etc. can be illustrated.
Further, the film thickness of the coating layer formed by applying a urethane paint is not particularly limited, but is preferably 10 to 200 μm.

6). Uses of Genuine Leather Materials The uses of the genuine leather materials are not particularly limited, but examples thereof include furniture such as chairs and skins of automobile interiors.

7). Interior parts of automobiles The interior parts of automobiles are not particularly limited, but examples include steering wheels, seat cushions, console armrests, assist grips, shift knobs, and instrument panels.

  ADVANTAGE OF THE INVENTION According to this invention, the genuine leather material which consists of a floor leather with a favorable feel and the adhesiveness of the coating-film layer formed by coating a paint can be provided. In addition, it is possible to provide an automobile interior product using this genuine leather material for the skin.

  3 to 7 parts by mass of silica having a particle size of 0.1 μm or less or 30 to 50 parts by mass of an organic filler having a particle size of 150 μm or less with respect to 100 parts by mass of the polyol component on the base layer made of floor leather. An automotive interior using a genuine leather material for the skin, comprising a sealing layer formed by applying a urethane coating and a coating layer formed by applying a urethane-based coating on the sealing layer.

  The leather material 10 of the present embodiment is used for the skin of an automobile steering wheel or the like, and as shown in FIG. 1, a base layer 11 made of floor leather and a urethane paint containing an inorganic filler or an organic filler are applied. And a coating layer 13 formed by applying a urethane-based paint.

Therefore, in the urethane paint used for forming the sealing layer, seven kinds of examples in which the kind of the polyol component, the kind of the isocyanate component, or the particle size or blending amount of the silica filler were changed, and the urethane paint was not used (sealing Those having no layer), those using a urethane paint that does not contain a silica filler in the formation of the filler layer, those using a urethane paint that contains a calcium carbonate filler instead of the silica filler in the formation of the filler layer, and The performance of four types of comparative examples (sealing effect, adhesion, wear resistance, hardness and bending resistance) using urethane paint blended with a silica filler with a large particle size (0.2 μm) for forming the sealing layer The evaluation results are shown in Table 1 below.
In addition, four examples in which the type or blending amount of the organic filler blended in the urethane coating used for forming the sealing layer, the urethane coating not used (no sealing layer), the sealing A urethane paint that does not contain an organic filler in the formation of the layer and a urethane paint in which the amount of the organic filler is reduced (20 parts by mass) or increased (70 parts by mass) is used to form the sealing layer. Table 2 below shows the evaluation results of the performance (sealing effect, adhesion, wear resistance, hardness and bending resistance) of the six comparative examples.
In both Tables 1 and 2, the unit in the blending column of the sealing layer (mixing of the urethane paint) is part by mass. However, the isocyanate component (polymeric MDI and urethane-modified monomeric MDI) is blended so that the isocyanate group in the component is equivalent to the hydroxyl group in the polyol component.

  In the urethane paint used in Examples or Comparative Examples, two kinds of polyether polyols having a hydroxyl value of 33 mgKOH / g or 400 mgKOH / g were used as polyether polyols. g or 260 mg KOH / g, and two types of isocyanate, namely, polymeric MDI (diphenylmethane diisocyanate) having an amine equivalent of 135 or urethane-modified monomeric MDI (diphenylmethane diisocyanate) having an amine equivalent of 280, Three types of silica fillers with a particle size of 0.014 μm, 0.1 μm or 0.2 μm are used, and PU (polyurethane resin) particle fillers with a particle size of 100 μm are used as leather particle fillers. Particle size consisting of cowhide was used as a 100 [mu] m. Further, triethylenediamine and zinc neodecanoate / bismuth diluted to 33% by mass with DPG (dipropylene glycol) were used as catalysts.

The genuine leather material of each example and comparative example was prepared as follows.
The surface of the floor leather made of buffed leather with a thickness of 2 mm was spray-coated with urethane paint mixed with each raw material component to a film thickness of 50 μm to form a sealing layer. . Thereafter, a polyester urethane paint was spray-coated on the surface of the sealing layer to form a coating layer having a thickness of 50 μm.
In Comparative Example 1, a polyester urethane paint was sprayed directly on the surface of the floor leather without forming a sealing layer to form a coating layer having a thickness of 50 μm.

  The performance of each of the examples and comparative examples of the present invention was evaluated as follows.

(1) Sealing effect The cross-sectional state of each sample (with a sealing layer formed on the floor leather) before coating with the polyester-based urethane paint was observed and evaluated with a microscope.
The urethane paint of the sealing layer penetrates into the floor leather, and there is a crack or hole in the sealing layer, that is, the base layer (floor leather) is not covered with the sealing layer. Was evaluated as ◯ when the sealing layer had no missing portion, that is, the base layer was covered with the sealing layer.

(2) Adhesiveness Two cuts that cross each other with a cutter knife are made in the coating layer of each sample, and the cellophane adhesive tape is attached to the surface of the coating layer so as to include the intersecting portion, and then the bonding is performed. The applied cellophane adhesive tape was peeled off, and the presence or absence of peeling of the coating layer was examined and evaluated.
The case where there was no peeling of the coating film layer was evaluated as ◯, and the case where there was peeling of the coating layer was evaluated as x.

(3) Abrasion resistance Using a Taber abrasion tester, evaluation was performed under the conditions of wear wheel CS # 10, load 9.8 N, and rotation speed 60 rpm.
A case where an appearance abnormality such as abrasion did not occur even when the rotation of 2000 rotations or more was continued was evaluated as ◯, and a case where an appearance abnormality such as abrasion occurred at a rotation of less than 2000 rotations was evaluated as x.

(4) Hardness Measured using a Shore A hardness meter.
And the case where hardness was 45 or less was set as (circle), and the case where it exceeded 45 was evaluated as x.

(5) Bending and softening The texture (feel) of the leather material was measured as bending and softness using a Softness Tester (Soft Nestester: manufactured by MSA Engineering Systems).
A sample having a Softness Tester value of 3 or more was evaluated as ◯, and a sample having a value of less than 3 was evaluated as ×.

From the above results, Examples 1 to 7 in which a urethane paint in which 3.3 to 6.6 parts by mass of a silica filler having a particle size of 0.1 μm or less was blended with respect to 100 parts by mass of the polyol component were used for forming the sealing layer. Comparative Example 1 without a sealing layer, Comparative Example 2 using a urethane paint not containing a silica filler (no organic filler added), and a urethane paint containing a calcium carbonate filler instead of a silica filler Unlike the comparative example 3 used and the comparative example 4 using the urethane paint which mix | blended the silica filler with a large particle size (0.2 micrometer), the sealing effect was favorable. And by the favorable sealing effect, it was soft and the texture was also favorable.
Moreover, unlike Comparative Example 1, Examples 1-7 were able to ensure the wear resistance required for the skin of automobile interior parts.
Further, unlike Comparative Example 3, Examples 1 to 7 did not become so hard that they were unsuitable for use in the skin of automobile interior parts.
In addition, Examples 1 to 7 were free from peeling and excellent in adhesion of the coating layer.

In Examples 8 to 11 in which a urethane paint in which 30 to 50 parts by mass of a polyurethane resin particle filler or a leather particle filler having a particle size of 100 μm is blended with respect to 100 parts by mass of the polyol component was used for forming the sealing layer, No Comparative Example 1, Comparative Example 2 using a urethane paint containing no organic filler (no silica filler) and 20 parts by mass of polyurethane resin particle filler or leather particle filler with respect to 100 parts by mass of the polyol component Unlike Comparative Examples 5 and 6 using the urethane paint, the sealing effect was good. And by the favorable sealing effect, it was soft and the texture was also favorable.
Moreover, Examples 8-11 differed from the comparative example 1, and were able to ensure the abrasion resistance calculated | required by the skin | cover of the automotive interior goods.
Further, Examples 8 to 11 are different from Comparative Example 7 and Comparative Example 8 in which a urethane paint in which 70 parts by mass of a polyurethane resin particle filler or a leather particle filler is blended with respect to 100 parts by mass of a polyol component is used. It was not hard enough to be used for the epidermis.
In addition, Examples 8 to 11 had no peeling and excellent coating layer adhesion.

This example could be used for the skin of automobile interior parts.
In addition, the cost could be reduced by using floor leather.
Furthermore, by using a two-pack type urethane paint for forming the sealing layer, there is no solvent, there is no influence on the environment due to the volatilization of the solvent, and the process by non-heating can be simplified.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.

It is a schematic diagram of the cross section of the genuine leather material of a present Example.

Explanation of symbols

10 Genuine Leather Material 11 Base Layer 12 Sealing Layer 13 Coating Layer

Claims (4)

A base layer made of floor leather,
A filler layer formed by applying a urethane coating containing 25 to 60 parts by mass of an organic filler or 2 to 10 parts by mass of an inorganic filler having a particle size of 0.15 μm or less to 100 parts by mass of the polyol component on the base layer; ,
A genuine leather material comprising a coating layer formed by applying a urethane paint on the sealing layer.   The genuine leather material according to claim 1, wherein the organic filler is a leather particle filler obtained by pulverizing leather into particles or a polyurethane resin particle filler obtained by pulverizing polyurethane resin into particles.   The genuine leather material according to claim 1, wherein the inorganic filler is a silica filler.   The interior goods of the motor vehicle which used the genuine leather material as described in any one of Claims 1-3 for the skin.

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