JPH11349908A - Fabric bonded processed article for interior automotive trim - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject processed article capable of preventing an air reservoir and preventing excellent appearance and productivity in being attached to a door rim of an automobile, etc., by laminating a foamed tacky agent to a fabric and developing air permeability in a tacky agent layer. SOLUTION: This processed article is obtained by laminating a foamed tacky agent layer to a fabric 1 to develop air permeability and has 0.1-30 mL/minute air flow amount based on 1 cm<2> under 0.2 kgf/cm<2> air pressure. An acrylic tacky agent is preferable as the tacky agent with respect to durability and economic efficiency. In order to add foams to a tacky agent layer 2, the tacky agent is mixed with a blowing agent such as azobisisobutyronitrile, etc., applied to a separator, etc., and foams are formed by a drying process and a heating process thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of attaching a cloth to a surface of a molded base material such as an automobile door trim.
The present invention relates to a fabric-adhesive processed product for an automobile interior material.

[0002]

2. Description of the Related Art In order to improve the beauty of the interior of a car,
In automobile door trim, decorative members such as fabrics are
There is a method of attaching the cloth as appropriate, and as a method of attaching the cloth, a method of applying an adhesive, a method of welding with a high frequency welder, a method of applying a double-sided tape, an adhesive processed article having an adhesive layer provided on the cloth, or the like Has been done.

[0003]

However, in the method of applying an adhesive, if the adhesive is a solvent type or an emulsion type, a drying step of the adhesive is required, and further, a reactivation step is required. There is also a problem that the number of production steps before mounting is large, and it is difficult to improve productivity.

On the other hand, in the method using high frequency welding, a resin layer required for welding is provided in advance on the back surface of the cloth, and high frequency welding is performed along the peripheral edge of the mounting member. However, high pressure is required. Since irregularities occur near the welded portion and can be easily identified from the surface of the mounting member, there is a problem that it is difficult to obtain a high texture.

[0005] There is also a method in which a double-sided adhesive tape is pasted on the back surface of the fabric and bonded. in this way,
As compared with the method using an adhesive, the work can be facilitated, and there is no unevenness in the welded portion, which is caused by the method using the high-frequency welder welding.

However, since the mounting member is often smooth and non-planar, it is extremely difficult to bond without entrapping air bubbles. Since the double-sided adhesive tape itself has no air permeability, it is bonded to the member to be mounted. There is a problem that an air pocket is generated between the member to be mounted and the member to be mounted after the joint pressing and the appearance is likely to be poor.

As a method of preventing air pools in advance, there is a method in which a double-sided adhesive tape is preliminarily processed with a needle hole and a ventilation hole is provided. Since the pressure-sensitive adhesive may flow after processing and close the needle hole, it is necessary to perform the process immediately before attaching to the member to be mounted, which causes a problem that a new process control in the production process is required.

[0008] Instead of using a double-sided adhesive tape, there is also a method of bonding using a cloth-adhesive product in which an adhesive is provided on the back surface of the cloth. However, similar to the method using a double-sided adhesive tape, the occurrence of blisters caused by air entrainment is generated. Is a problem.

The present invention has been made to solve the above-mentioned drawbacks of the conventional method, and an object of the present invention is to provide a fabric-adhesive processed product which can obtain good productivity and appearance when mounting fabric for an automobile interior. To provide.

[0010]

Means for Solving the Problems A pressure-sensitive adhesive product obtained by laminating a pressure-sensitive adhesive on a fabric, wherein air permeability is exhibited by laminating a foamed pressure-sensitive adhesive layer, and an air pressure of 0.2 kgf / cm ^2. Is an air-permeable fabric having an air permeability of 0.1 to 30 ml / min per 1 cm ² .

In the present invention, the air permeability is determined by the fact that when air pressure is applied to the surface of the adhesive, the thinned portion of the adhesive layer at the bubble portion is deformed and the adhesive layer is pushed and broken. The pores are formed to generate air permeability.

The air permeability in the present invention is 0.2 kgf /
When an air pressure of ² cm ² is applied, the air flow rate needs to be 0.1 to 30 ml / min per 1 cm ² .
If the ventilation rate is less than 0.1 ml / min, an air pocket is generated after bonding to the member to be mounted, and the appearance is impaired.
On the other hand, if the air flow exceeds 30 ml, the air bubbles are densely packed in the pressure-sensitive adhesive layer, which lowers the original adhesive properties of the pressure-sensitive adhesive and causes peeling.

The air pressure at the time of measuring the air flow rate is as follows:
This is based on the minimum pressure in press-clamping of the cloth-adhered product to the object.

The fabric used in the present invention includes woven fabrics such as plain weave, oblique weave, and satin weave, weft knits such as plain knit and rubber weave, and chain knits, denby knits, cord knits and double denby knits. A knitted fabric such as a tricot or a double tricot, a circular knit jersey, or the like is used, and bleaching, dyeing, printing, shrink-proofing, etc. are performed as necessary.

As the pressure-sensitive adhesive used in the present invention, a natural rubber-based pressure-sensitive adhesive, a synthetic rubber-based pressure-sensitive adhesive, a silicon-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, etc. are used. Based adhesives are preferred.

Here, when the adhesive solution is directly applied to the fabric, the adhesive solution soaks into the fabric and comes out on the surface. Even in the case of using a hot-melt type adhesive which is less concerned about this point, if it is applied directly to the fabric, the thickness accuracy is poor and the workability is poor.

As a method for containing bubbles in the pressure-sensitive adhesive layer, an organic or inorganic foaming agent is added to the solvent-type or emulsion-type pressure-sensitive adhesive, and then applied to a separator, followed by a drying step. In the subsequent heating step, it is effective to create bubbles.

Examples of the organic blowing agent include azobisisobutyronitrile, azodicarbonamide, benzenesulfonyl hydrazide, N, N'-dimethyl N, N '
-Dinitroterephthalamide and the like; and inorganic foaming agents include, for example, sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, ammonium nitrite and the like. These foaming agents may be used alone or in combination of two or more.

It is also effective to form air bubbles by mixing air into the pressure-sensitive adhesive by mechanical agitation. However, the present invention is not limited to any of the above methods, and it is not limited to any of the above methods. Therefore, it is important to obtain air permeability. The bubbles formed in this way are
Residual stress is inherent in the cell wall, and the cell wall is broken by the surface tension of the pressure-sensitive adhesive or the air pressure at the time of bonding, and the penetrating wall shrinks to form a stable through hole.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The fabric-adhesive processed product of the present invention has an air permeability at an air pressure of 0.2 kgf / cm ² by laminating a foamed adhesive to have a permeability of 0.1 to 30 ml / min per cm ^2. With this air permeability, blisters due to air pools can be prevented after laminating to the body to be mounted and pressing, and a good appearance can be obtained.

[0021]

Examples of the present invention will be described below. Example 1 100 parts of a solvent-type acrylic pressure-sensitive adhesive SK1717 (manufactured by Soken Chemical Co., Ltd.) was added to an isocyanate-based crosslinking agent Coronate L55ET (manufactured by Nippon Polyurethane Co., Ltd.)
1.0 part and 3.0 parts of ammonium carbonate were blended, applied to the separator using a bar coater so that the thickness of the adhesive layer after drying became 100 μm, and dried at 100 ° C. for 3 minutes. Then, the adhesive surface and the back surface of the fabric were laminated and laminated to obtain a fabric-adhesive processed product.

Example 2 Azobisisobutylnitrile (manufactured by Otsuka Chemical Co., Ltd.) was added to 100 parts of an emulsion type acrylic adhesive SKE-1000 (manufactured by Soken Chemical Co., Ltd.).
3.0 parts were blended, and coated on a separator using a bar coater to a dry thickness of 70 μm.
For 3 minutes. The back surface of the fabric was stuck to the surface of the pressure-sensitive adhesive and laminated to obtain a fabric-adhesive processed product.

(Example 3) Emulsion type adhesive SKE
-1000 100g using a three-one motor, 2
After stirring for 0 minutes and mixing air, coating, drying and lamination were performed under the same conditions as in Example 2 to obtain a fabric-adhesive product.

Comparative Example 1 Solvent-Type Adhesive SK1717
To 100 parts, 1.0 part of a crosslinking agent Coronate L55ET was added, and coating, drying and laminating were performed under the same conditions as in Example 1 to prepare a fabric adhesive processed product.

Comparative Example 2 Emulsion type adhesive SKE
-1000 was coated, dried and laminated under the same conditions as in Example 2 to obtain a fabric-adhesive product.

The above Examples and Comparative Examples were tested for air permeability, peeling strength, and appearance evaluation when they were bonded to a door trim skin material. Table 1 shows the results. The test method is as shown below.

[0027]

[Table 1]

(Breathability) Breathability tester KES-F8-A
Pressure of 0.2k using P1 (Kato Tech Co., Ltd.)
The ventilation rate was measured at gf / cm ² .

(Adhesive force) A cloth-adhesive processed product is cut into a width of 25 mm, and bonded to a door trim skin material (PVC skin).
After three reciprocal pressure bondings with a kg rubber roller and leaving at 20 ° C. for 20 minutes, the 180 ° peeling strength was measured at a pulling speed of 300 mm / min.

(Appearance) In the door trim shown in FIG.
The fabric adhesive processed product previously punched into a predetermined shape was bonded using a press bonding device, and the presence or absence of blisters on the fabric adhesive processed surface was visually measured.

[0031]

Since the fabric-adhesive processed product of the present invention has air permeability, it is possible to prevent blisters due to air pools after laminating and press-fitting to an object to be mounted, and to provide an automobile interior member having a good appearance. Can be obtained.

[Brief description of the drawings]

FIG. 1 shows a cross-sectional view of a fabric-adhesive product.

FIG. 2 is a schematic view of an automobile door trim.

FIG. 3 shows a part of a sectional view of an automobile door trim.

[Explanation of symbols]

 1. Fabric 2. 2. pressure-sensitive adhesive layer containing bubbles Fabric adhesive processed products 4. 4. Automotive door trim Skin material 6. Core material

Claims (1)

[Claims] 1. A pressure-sensitive adhesive product obtained by laminating a pressure-sensitive adhesive on a cloth, wherein air permeability is exhibited by laminating a foamed pressure-sensitive adhesive layer, and an air pressure of 0.2 kgf.
/ Breathable in cm ² is, 0.1~30m per 1cm ²
A fabric-adhesive product for automobile interiors, which has a ventilation rate of 1 / min.