JPH04161278A - Method for applying two-pack type adhesive - Google Patents

Abstract

PURPOSE:To easily sense the supply inferiority of a curing agent and to prevent the mass generation of an inferior product by respectively compounding a specific amount of a crosslinking agent and a specific amount of a dye with a main agent composed of a polyester resin and visually confirming proper mixing on the basis of the color of the dye when two solutions are applied to a bonding surface. CONSTITUTION:At least 35 pts.wt. of a crosslinking agent as a curing agent and 0.025-0.05 pts.wt. of a dye are added to 100 pts.wt. of a main agent composed of a polyester resin and mixed to be applied to a bonding surface. At this time, the proper mixing of the main agent and the curing agent is visually confirmed on the basis of the color of the dye. The bonding process due to the adhesive of these components is same to that explained in a column of conventional technique. That is, the main agent and the curing agent are mixed with aggregate composed of an ABS resin and the resulting mixture is applied to the bonding surface to be heated at predetermined temp. for a predetermined time and, thereafter, a laminated sheet is superposed on the adhesive coated surface to be bonded thereto by press molding and the molded one is then cooled. When the adhesive is mixed with the aggregate, the presence of the mixing of the curing agent can easily be and visually be confirmed by the dye of the curing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of applying a two-component adhesive used, for example, when molding an instrument, which is an interior part for a vehicle.

(Prior Art) Conventionally, for example, interior parts such as vehicle instrument panels need to have soft surfaces to protect the safety of passengers. It is formed by pasting together two layers of foam laminated sheets. The adhesive used for such attachment is, for example, a two-component adhesive consisting of a main ingredient and a curing agent as shown in the following table.

(Table 1) The process of adhesion using such an adhesive is as follows:
As shown in FIG. 1, first, base resin 1 and curing agent 2 are
00% by weight to 7% by weight of the curing agent (Figure A), then the mixed and adjusted adhesive 4 is applied to the aggregate 3 (Figure B), and then the adhesive 4 is mixed at a temperature of, for example, 75°C.
After heating for 0 minutes (Fig. 0), a laminate sheet 5 is polymerized on the adhesive-coated surface of the aggregate 3 and bonded with a press 6 (Fig. D), and then left for about 3 hours to form a finished product. (Fig. E) On the other hand, such a two-component adhesive application device is known, for example, as disclosed in Japanese Patent Application Laid-Open No. 61-278372, in which each supply is connected to a main agent tank and a curing agent tank, respectively. Each measuring device is installed in the tube, and the measured two liquids are led to a static mixer and mixed, and then sent to a coating gun.

(Problems to be Solved by the Invention) However, in conventional coating operations, the supply of either one of the coating materials may be interrupted due to equipment trouble or the like. In other words, this is caused by clogging of the pump, malfunction of the measuring device, clogging of piping, etc. In this case, the co-feeding of the base agent with a large amount of mixing is stopped, which the operator can easily visually determine, but curing with a small amount of mixing If the agent stops flowing, it cannot be visually determined and the work process continues.
In the final product state, the laminated sheet can be easily ff1l
There was a problem with the products being damaged or defective.

In other words, using only the base agent without a curing agent will not form a chemical cross-linking structure in the adhesive, and furthermore, through processes such as heating the aggregate, press forming after polymerizing the laminate sheet, and cooling,
The problem is that the same material is wasted.

(Means for Solving the Problems) In order to solve the problems, the present invention provides two components: a main agent and a curing agent.
In an adhesive application method in which a liquid is mixed and applied to an adhesive surface, the curing agent contains at least 3.5 parts by weight of a crosslinking agent and 0025 to 100 parts by weight of a main ingredient made of a polyester resin. 0.005 parts by weight of dye was added, and when mixed and applied to the adhesive surface, the color of the dye made it possible to visually confirm the proper mixing of the main ingredient and curing agent.

(Function) If there is a curing agent supply failure during mixing and coating, it can be easily detected, and a large number of defective products can be prevented.

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

As mentioned above, the molding of instrument panels, which are automobile interior parts, is carried out by pasting aggregates and laminate sheets using an adhesive that mixes two liquids: a base agent and a hardening agent. The components and mixing ratio of are shown in the table below.

Main ingredient of polyester resin mixed with xane 100%
Prepare 7 parts by weight of a curing agent consisting of a crosslinking agent and a diluent.
Prepare a weight section. The mixing ratio of the crosslinking agent and diluent of this curing agent was 3.5% by weight each, and the diluent contained 0.025 M% of blue dye. The color of this dye is not particularly limited to blue, but it is desirable that it be a contrasting color to the color of the adhesive surface.

In other words, when no dye is used, as in the conventional example (the dye is removed from the components of the main agent and curing agent of the present invention described above), the curing agent, which is a red bean color, is used for 100 parts by weight of the transparent main agent. This is because when 7 parts by weight is mixed, the red bean color of the curing agent becomes diluted and becomes almost transparent, making it impossible to determine whether or not the curing agent is present even when applied to the adhesive surface. In addition, especially when applying to an aggregate exhibiting a yellowish, milky white color such as ABS resin, a color such as blue that is easily noticeable compared to the color of the coated surface is desirable.

The bonding process using adhesives having such components is the same as that described in the prior art section. In other words, AB
After applying a mixture of the above-mentioned main agent and curing agent to aggregate such as S resin and heating at a specified temperature for a specified period of time, a laminate sheet is placed on the adhesive-coated surface and bonded by press molding. Cool and shape. When the adhesive is mixed with the aggregate, the presence or absence of the curing agent mixed can be easily visually confirmed by the dye of the curing agent.

The following table shows the results of an experiment on visibility using this blue dye applied to ABS resin aggregates in comparison with the conventional method, making it easy to check whether a hardening agent is mixed or not. It has been proven that it can be done.

Next, the results of confirming the influence of this dye mixing ratio on other factors will be explained.

First, we tested the effect of the dye mixing ratio on the work of workers, as shown in the table below.

According to this, if the mixing ratio of the dye is increased to 0.05 parts by weight per 100 parts by weight of the main agent as in Example 1, it will irritate the eyes of the workers and cause eye fatigue. It has been found that if the amount is 0.025 parts by weight as in 2, there will be no particular problem in terms of work.

Next, an adhesive strength test was conducted based on the inclusion of dye, and the results are shown in the following table.

(Table 5) In other words, the adhesive of the present invention containing 0.025 to 0.05 parts by weight of dye was used to bond the adhesive, and the adhesive strength was tested at two locations, the meter paisa side and the assistant side. It was completely satisfying.

Next, we checked the degree of contamination of whether the dye penetrated into the laminate sheet and the color of the dye was exposed on the surface of the laminate sheet.The results are shown in the following table.

(Table 6) In other words, as shown in FIG.
If the laminate sheets 5 are laminated together through a laminate sheet 5 and the thickness at which the dye in the adhesive penetrates into the sheets is defined as the degree of contamination t, the degree of contamination t is at most 0. The thickness was approximately 7 mm, and it was proven that there was almost no effect and no deterioration in quality occurred. Note that, in the laminate sheet 5 of this embodiment, foamed polypropylene is used as the foaming material 8, and polyvinyl chloride is used for the skin 9.

(Effects of the Invention) As described above, the adhesive application method of the present invention has a
Since the curing agent contains 0.025 to 0.05 parts by weight of the dye, the following effects can be obtained.

(1) During coating work, the operator can easily determine by visual inspection whether the curing agent has been properly mixed.

(2) Therefore, even if a curing agent supply failure occurs,
Application operations can be stopped immediately and countermeasures can be taken. Therefore, there is no problem of sending a large number of defective products to the bonding process unlike in the past, and the occurrence of defective products can be minimized.

(3) Since the adhesive is colored, even if there is uneven coating, it can be easily distinguished, and there is no deterioration in adhesive quality due to unpainted surfaces.

[Brief explanation of drawings]

Figure 1 is a process diagram to explain the adhesion process.
FIG. 2 is an enlarged sectional view of the adhesive surface. In addition, in the figure, 1 represents a main agent, 2 represents a curing agent, and 4 represents an adhesive.

Claims (1)

[Claims] In an adhesive application method in which two liquids, a base resin and a curing agent, are mixed and applied to an adhesive surface, the curing agent is at least 3.5 parts by weight based on 100 parts by weight of the base resin made of polyester resin. Contains 0.025 to 0.05 parts by weight of a crosslinking agent and 0.025 to 0.05 parts by weight of a dye, and when applying the two liquids to the adhesive surface, it is possible to visually check whether the main agent and curing agent have been mixed properly by checking the color of the dye. A method for applying a two-component adhesive, characterized by: