JP2952025B2 - Method of applying two-part adhesive - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for applying a two-part adhesive used for molding an instrument panel, for example, an interior part for a vehicle.

(Prior art) Conventionally, interior parts such as instrument panels of vehicles, for example, require a soft surface in order to protect occupants' safety. It is formed by sticking a two-layer laminate sheet of a foam material. As the adhesive for such attachment, for example, a two-component adhesive composed of a main component having the components shown in the following table and a curing agent is used.

In the bonding process using such an adhesive, as shown in FIG. 1, first, a main agent 1 and a curing agent 2 are mixed at a ratio of 7% by weight of a curing agent to 100% by weight of a main agent (FIG. 1A). ), Then the mixed and adjusted adhesive 4
Is applied to the aggregate 3 (FIG. B), and then,
The laminate sheet 5 is polymerized on the adhesive-coated surface of the aggregate 3 and bonded by a press 6 (FIG. D), and cooled for about 3 hours to obtain a finished product.
(FIG. E) On the other hand, as such an apparatus for applying a two-part adhesive, for example, an apparatus as disclosed in Japanese Patent Application Laid-Open No. 61-278372 is known, and each supply pipe connected to each of a main agent tank and a curing agent tank. Each of the measuring devices is arranged in such a manner that the two measured liquids are guided to a static mixer to mix and then sent to an application gun.

(Problems to be Solved by the Invention) However, in the conventional coating operation, the supply of either one may be interrupted due to a trouble of the apparatus or the like. In other words, this is caused by clogging of the pump, malfunction of the measuring instrument, clogging of the piping, etc. At this time, if the supply of the main agent containing a large amount of the mixture is stopped, the operator can easily visually recognize the curing, but the curing amount of the mixture is small. When the agent stops, it cannot be visually determined, the work process proceeds, and the laminate sheet is easily peeled off in the final product state and all products are defective. There was a problem. In other words, using only the main agent without a curing agent, a chemical cross-linking structure is not formed in the adhesive, and further, the same material is wasted by processes such as heating of the aggregate, press forming after laminating sheet polymerization, and cooling. This is a problem.

(Means for Solving the Problems) In order to solve the problems, the present invention relates to a method of applying an adhesive, in which two liquids of a main agent and a curing agent are mixed and applied to an adhesive surface, comprising a polyester resin. For 100 parts by weight of the base material, at least 3.5 parts by weight of the cross-linking agent and 0.025 to 0.05 parts by weight of the dye are added to the curing agent. The mixture was visually confirmed.

(Action) If there is a supply failure of the curing agent at the time of mixing application, it can be easily detected, and the occurrence of a large number of defective products can be prevented.

(Example) An example of the coating method of the present invention will be described.

As described above, the molding of the instrument panel of an automobile interior part is performed by attaching the aggregate and the laminate sheet with an adhesive that mixes two liquids of the main agent and the curing agent. Are as shown in the following table.

That is, 100 parts by weight of a main component of a polyester resin prepared by mixing polyester, toluene and 1.4 dioxane is prepared, and 7 parts by weight of a curing agent composed of a crosslinking agent and a diluent are prepared. The mixing ratio of the cross-linking agent and the diluent in the curing agent is 3.5 weight percent each, and the diluent contains 0.025 weight percent of a blue dye. The color of this dye is not particularly limited to blue, but is desirably a contrasting color to the color of the bonding surface.

In other words, as in the conventional example (the above-described components of the main agent and the curing agent of the present invention, in which the dye is removed), when the dye is not used, the curing agent having a reddish color is used for 100 parts by weight of the transparent main agent. This is because, when 7 parts by weight are mixed, the reddish color of the hardening agent fades and almost approaches a transparent color, and the presence or absence of the hardening agent cannot be determined even when applied to the adhesive surface. In particular, when applied to an aggregate having a yellowish milky white color such as an ABS resin, blue or the like which is easily noticeable with respect to the color of the applied surface is desirable.

The bonding process with the adhesive of such components is
This is the same as described in the section of the prior art. That is, AB
After mixing and applying the main component and the curing agent of the above components to an aggregate such as S resin, heating for a predetermined time and a predetermined temperature, then laminating the laminate sheet on the adhesive applied surface and bonding by press molding Cool and mold. When the adhesive is mixed with the aggregate, the presence or absence of the mixing of the curing agent can be easily visually confirmed by the dye of the curing agent.

In addition, the results of experiments on visibility by applying this blue dye to an ABS resin aggregate are shown in the following table, as compared with the conventional, and the presence or absence of the mixing of the curing agent can be easily confirmed. It was proved.

Next, the result of confirming the effect of the mixing ratio of the dye on other factors will be described.

First, the following table shows the effect of the mixing ratio of the dye on the work of the operator.

According to this, if the mixing ratio of the dye is increased to 0.05 parts by weight with respect to 100 parts by weight of the main agent as in Example 1, the eyes of the worker are stimulated and the eyes are easily tired. On the other hand, as in Example 2, At 0.025 parts by weight, it was found that there was no particular problem in work.

Next, the results of a test of the adhesive strength due to the inclusion of the dye are shown in the following table.

That is, adhesion was performed using the adhesive of the present invention containing 0.025 to 0.05 parts by weight of the dye, and an adhesion strength test was performed at two places on the meter visor side and the assistant side, and all of them sufficiently satisfied the practical strength.

Next, the results of confirming the degree of contamination as to whether or not the dye permeated the laminate sheet and whether the color of the dye was exposed on the surface of the laminate sheet were as shown in the following table.

That is, as shown also in FIG. 2, when the laminate sheet 5 is adhered to the aggregate 3 via the adhesive 4 and the thickness at which the dye in the adhesive permeates the sheet is defined as the contamination degree t.
For example, for a laminate sheet 5 of 3.0 mm to 4.0 mm, the contamination degree t is about 0.7 mm at the maximum, and it has been proved that there is almost no influence and no deterioration in quality is caused. The laminate sheet 5 of this embodiment uses foamed polypropylene as the foam material 8 and polyvinyl chloride as the skin 9.

(Effects of the Invention) As described above, the method for applying the adhesive of the present invention comprises
The following effects are obtained because the curing agent contains 0.025 to 0.05 parts by weight of the dye per part by weight.

(1) At the time of coating operation, an operator can easily visually judge that the curing agent is properly mixed.

(2) Therefore, even if a supply failure of the curing agent occurs,
Immediately, the application operation can be stopped and countermeasures can be taken. Accordingly, there is no problem that a large amount of defective products are flowed through the bonding process as in the prior art, and the occurrence of defective products can be minimized.

(3) Since the color is added to the adhesive, even if there is uneven coating, it can be easily determined, and there is no decrease in the bonding quality due to the occurrence of an unpainted surface.

[Brief description of the drawings]

FIG. 1 is a process diagram for explaining a bonding process.
FIG. 2 is an enlarged sectional view of the bonding surface. In the figure, 1 is a main agent, 2 is a curing agent, and 4 is an adhesive.

Claims (1)

(57) [Claims] 1. An adhesive applying method in which two liquids of a main agent and a curing agent are mixed and applied to an adhesive surface, wherein the curing agent is based on 100 parts by weight of a main agent composed of a polyester resin. Contains at least 3.5 parts by weight of crosslinking agent and 0.025 to 0.05 parts by weight of dye, and when applying two liquids to the adhesive surface, visually confirm whether the main agent and the curing agent are properly mixed with the color of the dye. A method for applying a two-part adhesive, characterized in that: