JP2005132085A - Molded pad for outer skin-bonded molding, and outer skin-bonded molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molded pad used for outer skin-bonded molding and generating no unevenness on the surface of the outer skin when bonding and molding the single outer skin and the molded pad with an adhesive. <P>SOLUTION: This molded pad for the outer skin-bonded moldings is made of foamed polyurethane and has the physical properties such as a density of 35-50 kg/cm<SP>3</SP>, a hardness of 65-235 N and an air permeability of ≤15 cc/cm2/sec. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mold pad for a skin adhesive molded article made of polyurethane foam, which is used for a vehicle seat pad for automobiles, aircraft, trains and the like. The present invention also relates to a skin adhesive molded product obtained by molding the mold pad for skin adhesive molded product and the skin using an adhesive or the like.

  2. Description of the Related Art Conventionally, a skin adhesive molded product of a skin material and a mold pad made of polyurethane foam has been used as a vehicle seat pad. As this conventional skin material, a frame laminate product composed of two layers of a skin and a slab urethane has been used. (Patent Document 1)

Patent Document 1 relates to a method for positioning a mold pad in adhesive molding of a vehicle seat, and shows that a seat cover (skin material) is composed of a skin and a urethane slab.
Japanese Patent Laid-Open No. 9-1566 (paragraph [0003])

  By the way, the slab urethane used for this skin material has fulfilled the following purposes. The first purpose is to realize the softness of the initial touch at the moment when a person is seated on the vehicle seat pad, and the second purpose is to relieve the unevenness generated on the surface of the seat pad by the adhesive and to improve the appearance of the product. Because.

However, an adhesive molded product of a single skin without a slab urethane and a mold pad is required as a means for meeting the demands for reducing the weight of the vehicle body and the cost reduction requirements due to environmental considerations.
On the other hand, recently, with the diversification of vehicle seats, the design design on the skin with a large growth rate is increasing.

Here, using a conventional mold pad to integrate a single skin without slab urethane and a mold pad with an adhesive to obtain a skin-adhesive molded product, unevenness occurs on the surface of the seat pad, resulting in product appearance Will be damaged.
In particular, in the case of a single skin having a high elongation rate, the fine irregularities of the adhesive-impregnated portion immediately appear on the surface of the skin, and the product appearance is liable to be significantly impaired.

  As described above, in the conventional mold pad, the adhesive penetrates into the mold pad and the surface of the skin is uneven, and there is room for improvement in obtaining an adhesive molded product of the single skin and the mold pad by the adhesive. It was left.

The present invention pays attention to the above-mentioned problems, and at the time of adhesive molding with an adhesive between a single skin and a mold pad, a mold for a skin adhesive molded product capable of industrial production without causing irregularities on the surface of the skin. The purpose is to provide a pad.
That is, it does not require a coating amount that is likely to cause the adhesive to penetrate into the mold pad, and enables the adhesive pad to be formed between the backing material alone (single skin) and the mold pad with a minimum amount of adhesive. Provided is a mold pad for an outer skin adhesive molded article made of polyurethane foam.
Furthermore, using the mold pad for the skin adhesive molded product, a skin adhesive molded product with the skin (single skin) made of only the backing material is provided.

  1st invention of this application is a mold pad which consists of a polyurethane foam used for a skin adhesive molded article, Comprising: The physical characteristic value of the mold pad is density: 35-50 kg / cm3 hardness: 65-235N, air permeability: It is a mold pad for skin-adhesive molded products characterized by being 15 cc / cm2 / sec or less.

  A second invention of the present application is a skin-adhesive molded product characterized in that a mold pad for a skin-adhesive molded product having the above physical characteristic values and the skin are integrated with an adhesive.

Hereinafter, the present invention will be described in more detail.
As a result of intensive studies, it has been found that the unevenness of the surface that occurs when a single skin (backing material only) is adhered to the mold pad is due to variations in how the adhesive penetrates into the mold pad.
More specifically, when the adhesive is infiltrated into the mold pad from a place where there is little film on each bubble constituting the mold pad, the bubbles are solidified in a state where the bubbles are crushed at the time of adhesion compression. As a result, the surface of the epidermis becomes uneven.
Therefore, by setting the air permeability of the surface portion of the mold pad to 15 cc / cm2 / sec or less, it is possible to prevent the penetration of the adhesive by leaving a large amount of film in each of the bubbles constituting the mold pad, and the surface of the skin is uneven. It has been found that a skin adhesive molded product can be obtained without deteriorating the appearance of the product, and the present invention has been completed.

In the present invention, as described above, a mold pad made of polyurethane foam having a density of 35 to 50 kg / cm 3, a hardness of 65 to 235 N, and an air permeability of 15 cc / cm 2 / sec or less is used as the mold pad for the skin adhesive molded product. In addition, these physical characteristic values are measured using the measuring method of JIS K 6401 for the density and hardness, and the air permeability is JIS K 6400 using a slice of the surface layer portion (10 mm from the surface) of the mold pad. The measurement method was used.
When the density and hardness are less than the lower limit values, the body is too soft and the body sinks into the mold pad, and the sitting comfort is poor. Further, when the density and hardness exceed the upper limit values, it is too hard and may cause fatigue when seated for a long time, so that the original function of the vehicle seat pad is not achieved.
The air permeability is 15 cc / cm 2 / sec or less, preferably 10 cc / cm 2 / sec or less. Here, if the air permeability exceeds 15 cc / cm 2 / sec, there are many places where there are few films in each bubble constituting the mold pad, and irregularities are generated on the surface of the skin during the adhesive molding.

In the present invention, a mold pad made of polyurethane foam can be obtained by a conventionally known production method. Here, in particular, the air permeability can be controlled as follows.
For example, (1) Adjusting the packing ratio to the sheet pad mold, (2) Lowering the isocyanate ratio, (3) Adding a foam stabilizer as an auxiliary agent, (4) Adjusting crushing after demolding However, since the density and hardness need not be changed as much as possible, adjustment with a foam stabilizer is most preferable.

  In the present invention, a skin-adhesive molded product can be obtained by integrating a mold pad for a skin-adhesive molded product and a single skin only of a backing material with an adhesive. As the adhesive used for integration here, conventionally known adhesives can be used. Among them, urethane adhesives are preferably used because they have excellent adhesiveness and are easy to handle.

  In the present invention, by using the mold pad for the skin-adhesive molded article having the above-described structure, the single skin having a large elongation rate according to JIS L 1096 of 100% or more in the vertical direction and 130% or more in the transverse direction It is possible to easily obtain a skin adhesive molded product. As described above, since the single skin having a large elongation rate has good followability to the three-dimensional shape, it easily follows even the fine irregularities due to the adhesive-impregnated portion on the pad surface. By using it, it is possible to obtain a skin-bonded molded article having a good product appearance.

  As described above in detail, according to the present invention, the physical characteristic values are density: 35-50 kg / cm 3, hardness: 65-235 N, and air permeability: 15 cc / cm 2 / sec or less. By using an adhesive molded product mold pad, the adhesive does not soak into the mold pad and the surface of the skin does not become uneven in integration with a single skin, which was difficult with conventional mold pads. Industrial production of a skin adhesive molded product mold pad and a skin adhesive molded product has become possible.

Hereinafter, a mold pad for an outer skin adhesive molded product according to an embodiment of the present invention will be described.
After mixing the raw materials excluding isocyanate with the stirrer among the blended formulations in Table 1, the isocyanate was added and stirred and mixed, poured into a mold for a seat pad, foamed, and 3 minutes to 5 at 63 ± 3 ° C. A mold pad was obtained by curing for a minute.
After standing for a day and night, the physical properties of the mold pad were measured for density and hardness using the measurement method of JIS K6401, and for air permeability, the surface of the mold pad (10 mm from the surface) was sliced. And measured using the measuring method of JIS K 6400.

  Next, the surface of the skin was obtained by bonding and molding a single skin with a backing material only having an elongation of 110% in the vertical direction and 145% in the lateral direction using urethane-based adhesive. The appearance unevenness evaluation was expressed by the number of the unevenness of N = 10, and the appearance unevenness evaluation result on the surface of the skin was used.

  In Examples 1 and 2, since the physical property value is within the above range, no penetration of the adhesive occurs inside the mold pad, no irregularities are observed in the appearance of the surface of the skin, and the peel strength is sufficient. Met. In Comparative Examples 1 and 2, since the physical property value is outside the above range, the infiltration of the adhesive into the mold pad occurred, the surface of the skin was uneven, and the peel strength was insufficient. .

  Table 1 shows the formulation of the above Examples 1 and 2 and Comparative Examples 1 and 2, the physical property values of the mold pad, and the appearance unevenness evaluation results on the skin surface. In addition, all the numerical values in Table 1 represent parts by weight when the polyol component is 100 parts by weight.

Component Polyol component used in Examples and Comparative Examples 1: Mitsui Takeda Chemical Co., Ltd. Actol POP9640
Polyol component 2: manufactured by Dow Polyurethane Japan Co., Ltd., Boranol 4053 polyol (XUS-16033.00 L)
Amine catalyst 1: manufactured by Mitsui Takeda Chemical Co., Ltd., DEA (diethanolamine amine catalyst 2: manufactured by Tosoh Corp., TEDA-L33
Amine catalyst 3: manufactured by GOLDSCHMIDT, NIAX C-225
Silicone foam stabilizer: manufactured by GOLDSCHMIDT, TEGOSTAB B8719LF
Cross-linking agent: Sakamoto Yakuhin Kogyo Co., Ltd., glycerin isocyanate: Mitsui Takeda Chemical Co., Ltd. Cosmonate TM20 (isocyanate)

  In the above embodiment, the case where the density, hardness, and air permeability of the mold pad are set to arbitrary values is described. However, the present invention is not limited to this, and the values set in the above range are used. You may set suitably.

  Further, the present invention is not limited to the above-described embodiment as it is, and can be embodied without departing from the spirit of the invention in the implementation stage.

As described above, when the mold pad of the present invention is used, the appearance unevenness on the surface of the skin due to the adhesive soaking into the mold pad does not occur during the adhesive molding of the single skin and the mold pad. Thus, by obtaining an adhesive molded product of a single skin and a mold pad using an adhesive, it is possible to provide a mold pad for skin adhesive molded product and a skin adhesive molded product that can be industrially produced.
In addition, as a means to respond to demands for lighter body weight and cost reduction due to environmental considerations, it is extremely useful as a means for responding to design design with a large growth rate due to diversification of vehicle seats. It is valid.

Claims (3)

  It is a mold pad made of polyurethane foam used for a skin adhesive molded product, and the physical properties of the mold pad are density: 35-50 kg / cm 3, hardness: 65-235 N, air permeability: 15 cc / cm 2 / sec or less A mold pad for an outer skin adhesive molded product, characterized in that   A skin-adhesive molded product comprising the mold pad for a skin-adhesive molded product according to claim 1 and a single skin integrated with an adhesive.   3. The skin adhesive molded product according to claim 2, wherein the single skin has an elongation percentage according to JIS L 1096 of 100% or more in the vertical direction and 130% or more in the transverse direction.