JPH1043680A - Sticking method of another member to trim part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate curing of a reactive type hot melt adhesive and greatly heighten the productivity by carrying out simultaneous spray coating with the reactive type hot melt adhesive and an aqueous solution of an accelerating agent at the time when an another member is stuck to and fix in a trim part while using the reaction curable hot melt adhesive. SOLUTION: At the time of sticking a decorative sheet, for which a material lined with polyurethane foam is used, to the back side of woven fabric, a masking jig 40 is so positioned at a prescribed point of the surface of a door trim main body 20 as to expose only an intermediate adhesive part of the door trim main body 20 and after that, the intermediate adhesive part is coated with a reactive type hot melt adhesive 50 by spray coating by a spray gun 51 and simultaneously with an aqueous solution of an accelerating agent 60 by spray coating by a spray gun 61. Consequently, the curing time of the reactive type hot melt adhesive 50 can be greatly shortened. After that, a decorative sheet is stuck to and fixed in a prescribed part of the door trim main body 20 by pressure-joining dies through the reactive type hot melt adhesive 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bonding a separate member to a trim part using a reactive hot melt adhesive, and more particularly to a method of curing a reactive hot melt adhesive. And a method for bonding another member to a trim part with improved productivity.

[0002]

2. Description of the Related Art Generally, various interior parts are mounted in a vehicle interior.
In the case of a door trim for an automobile, a configuration in which a decorative sheet as a separate member is attached to a predetermined portion of a door trim body obtained by integrally attaching a skin material to a core material surface to further enhance decorativeness, Alternatively, as shown in FIG. 6, a resin bracket 3 for attaching a clip 2 for attaching to the roof panel is fixed at a predetermined position on the back surface of the roof trim 1 attached to the indoor side of the roof panel via an adhesive. A known configuration is known.

[0003] As a recent trend, there is a tendency that the solvent of the adhesive is regulated in consideration of the working environment. As the adhesive, a reactive hot melt of a type which absorbs humidity in the air and reacts and cures. The demand for adhesives is increasing.

FIG. 7 is a flowchart showing an operation for bonding and fixing the bracket 3 to the roof trim 1.
First, after coating a reactive hot-melt adhesive on a predetermined portion of the back surface of the roof trim 1, an accelerator is spray-applied to accelerate the curing of the reactive hot-melt adhesive, and then the bracket 3 is pressed and fixed. That is the fact.

[0005]

However, the reactive hot-melt adhesive is of the type that cures by absorbing the humidity in the air, so that the curing time tends to be greatly affected by the environmental humidity. .

For example, the change of the curing time of the reactive hot-melt adhesive in the case where a reactive hot-melt adhesive, trade name: Hibon XU057-1 (manufactured by Hitachi Chemical Co., Ltd.) is used without using an accelerator is shown. This is shown in the graph of FIG.

As is apparent from the graph, the environmental temperature and the environmental humidity are 20 ° C., 65% RH, 20 ° C., 40% RH,
At 20 ° C. and 15% RH, the curing time of the reactive hot-melt adhesive is 2 days, 5 days, and 14 days, respectively. When the environmental humidity is low, the curing time is extremely long and is not suitable for mass production.

As a countermeasure, if the accelerator is coated in a later step as shown in the flow chart of FIG. 7, the curing time of the reactive hot-melt adhesive can be reduced to about 24 hours, but the interior of automobile interior parts can be reduced. It was difficult to apply to such mass-produced parts.

The present invention has been made in view of such circumstances, and in a method of bonding another member to a trim component, a reactive hot melt adhesive is used in consideration of a working environment. In addition, an object of the present invention is to provide a method of bonding different members, which can significantly increase productivity because the curing time of the adhesive can be shortened without being affected by environmental humidity.

[0010]

In order to achieve the above-mentioned object, the present invention provides a method for forming a separate part on a trim part by using a reactive-type hot-melt adhesive of a reactive curing type which absorbs humidity in the air. In the method of bonding another member to a trim part for bonding and fixing the member, the reactive hot melt adhesive and the aqueous solution of the accelerator are simultaneously spray-coated to accelerate the curing of the reactive hot melt adhesive in the air. It is characterized by the following.

Here, the trim component and the separate member can be applied to a decorative sheet mounted on the door trim main body, a clip mounting bracket fixed to a predetermined portion on the back surface of the roof trim, or the like.

The reactive hot-melt adhesive used for bonding another member includes a polyaddition type epoxy compound,
Isocyanate compounds are preferable, do not generate volatiles during curing, are excellent in heat resistance, and have little shrinkage distortion during curing. For example, a quick-setting urethane-based hot melt adhesive, trade name: Hybon XU057-1 (Manufactured by Hitachi Chemical Co., Ltd.) is preferred.

As the promoter, an amine catalyst which is usually used as a urethane foam catalyst is used. For example, an imidazole tertiary amine catalyst, trade name: NC-IM (manufactured by Sankyo Air Products Co., Ltd.) ) Is suitable.

As is apparent from the above constitution, in the method of the present invention, a reactive hot-melt adhesive and an aqueous solution of an accelerator are simultaneously spray-coated on a predetermined portion of a trim part and mixed in the air to perform reaction hardening. Since it accelerates, the curing time of the reactive hot melt adhesive can be greatly reduced without being affected by the environmental humidity.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for bonding separate members according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing an automobile door trim to which a decorative sheet is mounted by applying the method of the present invention, FIG. 2 is a sectional view showing the structure of the automobile door trim, and FIG. FIG. 4 is a flow chart, FIG. 4 is an explanatory view showing an outline of the bonding step, and FIG. 5 is an explanatory view showing an embodiment in which the method of the present invention is applied to a method of fixing a bracket.

Referring to FIGS. 1 and 2, the structure of the vehicle door trim 10 will be briefly described.
Reference numeral 0 generally comprises a door trim main body 20 formed into a required shape and a decorative sheet 30 mounted on a part of the surface of the door trim main body 20.

More specifically, the door trim main body 20 has a skin material 22 integrally attached to a surface of a resin core material 21 having shape retention and rigidity for mounting to a vehicle body panel. PP material mixed with talc is used as a material of the core material 21, and a laminated sheet material in which a polyethylene foam is lined on the back surface of a PVC sheet is used as the skin material 22, and the skin material 22 is set in a mold in advance. The door trim main body 20 is manufactured by simultaneously molding the resin core material 21 by stamping molding and integrating the resin core material 21 and the skin material 22.

On the other hand, the decorative sheet 30 is the door trim body 2
In order to provide an outer appearance material 22 and an appearance accent effect, a material having a woven fabric backed with polyurethane foam is used, and is adhered and fixed to a predetermined portion (inscribed portion) of the surface of the door trim main body 20.

As apparent from the flowchart shown in FIG. 3 and the process explanatory view shown in FIG. 4, the method of bonding the decorative sheet 30 is such that only the inscribed portion A of the door trim main body 20 is exposed. After the tool 40 is positioned at a predetermined position on the surface of the door trim body 20, the reactive hot-melt adhesive 50 is spray-applied to the insulated portion A by the spray gun 51, and at the same time, the aqueous solution of the accelerator 60 is similarly spray-applied by the spray gun 61. I do.

The reactive hot-melt adhesive 50 is a solidified urethane hot-melt adhesive, trade name:
Hibon XU577-1 (manufactured by Hitachi Chemical Co., Ltd.) is used, and as the accelerator 60, an imidazole tertiary amine catalyst, trade name: NC-IM (manufactured by Sankyo Air Products Co., Ltd.) is used. .

As described above, the reactive hot melt adhesive 5
By mixing 0 and the accelerator 60 in the air, the curing time of the reactive hot melt adhesive 50 became 5 hours, and the curing was completed.

Thereafter, the decorative sheet 30 may be bonded and fixed to a predetermined portion of the door trim body 20 via a reactive hot-melt adhesive 50 by a crimping die (not shown).

Next, Table 1 shows the curing time of the reactive hot melt adhesives of Comparative Examples 1 to 3 in comparison with the method of the present invention.

Comparative Example Reactive Hot Melt Adhesive Only (No Water Spray) Comparative Example Reactive Hot Melt Adhesive + Water Spray Comparative Example Reactive Hot Melt Adhesive + Aqueous Spray of Accelerator in Post Process

[0026]

[Table 1]

As is clear from Table 1, even when the environmental humidity is low, by spraying the aqueous solution of the accelerator 60 simultaneously with the reactive hot melt adhesive 50,
It can be easily understood that the curing time of the reactive hot melt adhesive 50 can be significantly shortened as compared with various comparative examples.

Next, as shown in FIG. 5, the method of the present invention can be applied to a case where a bracket is bonded to the back surface of the roof trim 70. As described above, a reactive hot melt adhesive is applied to a predetermined portion of the back surface of the roof trim 70. 50 and accelerator 60
And the spray solution are spray-coated simultaneously with the spray guns 51 and 61 to accelerate the curing time of the reactive hot-melt adhesive 50 and press-fix the bracket, thereby increasing the productivity and improving the interior parts of automobiles. It is suitable for such mass-produced products.

[0029]

As described above, the present invention has the following special functions and effects.

(1) According to the method of the present invention, when a separate member is bonded to a trim part, the curing time of the reactive hot melt adhesive is simultaneously spray-coated with the reactive hot melt adhesive and an accelerator aqueous solution. This has the effect that the time can be significantly reduced, and the productivity of mass-produced products can be significantly improved.

(2) In the method of the present invention, when a separate member is bonded to a trim part, a reactive hot-melt adhesive and an aqueous solution of an accelerator are spray-coated at the same time, so that the reaction can be performed without being affected by environmental humidity. Since the curing time of the mold hot melt adhesive can be drastically accelerated, it is not affected by seasonal changes in humidity, etc.
Since the bonding operation is always completed in a fixed cycle, the production process can be managed smoothly.

[Brief description of the drawings]

FIG. 1 is a front view showing an automobile door trim produced by applying the method of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a flowchart showing a process of bonding a decorative sheet to a door trim main body.

FIG. 4 is an explanatory view showing a process of bonding a decorative sheet to a door trim main body.

FIG. 5 is an explanatory view showing another embodiment of the method of the present invention and showing a step of bonding a bracket to a roof trim.

FIG. 6 is an explanatory view showing a conventional example in which a bracket is adhesively fixed to a roof trim.

FIG. 7 is a flowchart showing a conventional work process for bonding a bracket to a roof trim.

FIG. 8 is a graph showing the transition of the curing time of the reactive hot melt adhesive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Automobile door trim 20 Door trim main body 30 Decorative sheet 40 Masking jig 50 Reactive hot melt adhesive 60 Accelerator 51,61 Spray gun 70 Roof trim

Claims (1)

[Claims] 1. A separate member (30, 80) is bonded to a predetermined part of a trim component (20, 70) by using a reactive hot-melt adhesive (50) of a reactive curing type that absorbs humidity in the air. In a method of bonding another member to a trim part to be fixed, the reactive hot melt adhesive (50) and an accelerator (6)
By spray-coating simultaneously with the aqueous solution of 0),
A method for bonding another member to a trim part, wherein curing of the reactive hot melt adhesive (50) is accelerated in air.