JPH01135965A - Foaming sealer - Google Patents

Abstract

PURPOSE:To prevent a steel plate from corrosion in the sealer contact part by coating a location, brought into contact with the steal plate in its sealed part, with a non-foaming or low-foaming sealer, in the case of a foaming sealer in the junction part of an automobile body. CONSTITUTION:A foaming sealer 11 is formed in a long-size tape shape of fixed width, comprising a high-foaming sealer 12 of rectangular section and a non-foaming sealer 13 of thin plate shape closely attached respectively to both upper and bottom surfaces of this high-foaming sealer 12 in such a manner as to hold it. The foaming sealer 11 coats its location, brought into contact with a steel plate, of the surfaces of the high-foaming sealer 12 with the non- foaming sealer 13 containing no water. Thus enabling the steel plate to be prevented in its sealer contact part from corrosion, infiltration of dust and water from the outside can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a foam sealer that is placed in an unfoamed state on a portion to be sealed and then foamed using Calo heat or the like.

Conventional technology Foamed sealers have traditionally been used to fill gaps between steel plates such as joints in automobile bodies to prevent dust and water from entering from the outside world. Sealants suitable for ensuring reliable sealing include:
There is a low-temperature vulcanization type high foaming sealer described in Japanese Patent Application Laid-Open No. 62-62882, and this type of sealing material is used in the form of a tape or rod.

For example, as shown in FIGS. 12 and 13, a foam sealer 1 is used to seal a gap 4 between a sealer (upper plate) 2 and a sun sealer housing (lower plate) 3 of an automobile body, It is disposed in an unfoamed state at a predetermined position within the gap 4 during the sheet metal assembly process, and is foamed and hardened when heated in a coating drying oven during the subsequent electrodeposition coating process. By increasing the volume at , the gap 4 between the sealer 2 and the sun sealer housing 3 is closed to prevent dust and water from entering from the outside world.

Problems to be Solved by the Invention However, in the case of the conventional foam sealer 1 described above, a high foam sealer with a high foaming ratio is used to significantly increase the volume and reliably close the gap 4. Therefore, since the foamed sealer 1 after being heated and foamed has many large bubbles formed therein, water is likely to be contained in the bubbles, and as a result, the sealer that is in contact with the foamed sealer 1 containing water is There was a risk that steel plates such as 2 and the sun sealer housing 3 would be corroded.

The present invention was made in view of the above-mentioned problems, and aims to provide a foam sealer that prevents the intrusion of dust and water and prevents rust from forming in the sealing portion.

Means for Solving the Problems As a means for solving the above-mentioned problems, the present invention provides a foaming method which is provided in an unfoamed state at a predetermined location such as a joint where sealing is required, and is foamed to form a seal. The sealer is characterized in that a portion of the surface of the unfoamed high-foaming sealer that comes into contact with the portion to be sealed is coated with a non-foaming sealer or a low-foaming sealer.

By forming the grooves as described above, the unfoamed foam sealer is applied to the surface of the foam sealer where the area covered with the previous foam sealer or the low foam sealer is sealed. When placed in contact with or facing the steel plate and foamed, the high foaming sealer portion foams and fills the gap, and the pre-foaming sealer or low foaming sealer is in close contact with the steel plate portion and fills the gap. Completely occludes and prevents dust and water from entering from the outside world, and the part that comes into contact with the steel plate is a non-foaming sealer or low-foaming sealer that does not easily contain water. Will not rust due to water content.

EXAMPLES Hereinafter, examples of the foamed sealer of the present invention will be explained based on FIGS. 1 to 11.

1 to 3 show a first embodiment of the present invention, in which a foam sealer 11 is formed in the form of a long tape with a constant width, and a high foam sealer 12 with a rectangular cross section and a high foam sealer 12 with a rectangular cross section It consists of thin plate-shaped non-foaming sealers 13, 13 that are in close contact with the upper and lower surfaces of the foam sealer 12, respectively, and the composition of the high foam sealer 12 is 30% by weight of butadiene rubber, 20 mm% of process oil, and the like. , 44% by weight charcoal and calcium, 5% by weight vulcanization curing agent, 1% by weight
and a blowing agent. On the other hand, the non-foaming sealer 13
The composition is 30% by weight of butadiene rubber and 20% by weight of
of process oil, and 45% by weight of calcium carbonate.
It consists of a vulcanization curing agent of 5w%.

Then, the high foaming sealer 12 is molded to a thickness of 8IwF&, and the non-foaming sealer 13 is molded to a thickness of 1M, and the non-foaming sealers 13, 13 are adhered to the upper and lower surfaces of the high foaming sealer 12, respectively, to a thickness of 10m and a width. A 10 m tape-shaped foamed sealer 11 was manufactured. In addition, as a conventional foam sealer for comparison with the foam sealer 11, only the high foam sealer 12 was prepared in the form of a tape with a thickness of 10 mm and a width of 0 mm. The foam sealer 11 was placed on one of two sets of test pieces in which the gap between the steel plates S and S was set to 13 m, and the conventional foam sealer was placed on the other, and each was electroplated. At the same time, each of the foamed sealers was foamed and hardened using the heat used to dry the coating, and then a salt water spray test was conducted on each test piece for 500 hours, and the foamed sealers were removed and examined for the presence or absence of rust. As a result, no rust was observed in the test piece using the foam sealer 11 of Example, but rust was found in the test piece using the conventional foam sealer for comparison. .

In this way, the foamed sealer 11 covers the portion of the surface of the highly foamed sealer 12 that comes into contact with the steel plate with the non-foamed sealer 13, which does not contain water, so the foaming ratio is increased in order to improve the ability to fill gaps. Even if a highly foamed sealer 12 with a high foaming temperature is used, the water contained in the highly foamed sealer 12 does not come into contact with the steel plate, thereby preventing rust from forming.

Further, FIGS. 4 to 7 show a second embodiment of the present invention, in which a foamed sheep 21 is a highly foamed sheep 22 and a thermally foamed sheep 23 having the same composition as in the first embodiment. The heat-foamed sheet 23 has a thickness of 1 mm.
The highly foamed sheet 2 is formed with tapered parts 23a, 23a on both sides to form a trapezoidal cross section with thinned side edges.
2 is molded to have a thickness of 8M at the center, and has tapered parts 22a, 22a on both sides that are thicker on the outside in accordance with the slopes of the tapered parts 23a, 23a of the heat-foamed sheep 23. The heat-foamed sheets 23, 23 each having a trapezoidal cross section were brought into close contact with the upper and lower surfaces to produce a tape-shaped foamed sheet 21 having an overall rectangular cross-section, a thickness of 10 m, and a width of 10 m.

The foam sheet 21 configured as described above is placed in the gap between the two separated steel plates S, and after electrodeposition coating is performed, the coated surface P is heated and dried in a drying oven. The foam is caused to foam due to the heat generated, filling the space between the steel plates S and S to close the gap.

At this time, the highly foamed sheep 22 of the foamed sheep 21 expands in the S direction of the upper and lower steel plates S, expands in the width direction, and bulges out to both sides (see Fig. 6). The foamed sheep 22 covers the boundary B between the foamed sheep 21 and the painted surface P, which is the most prone to rust due to the accumulation of infiltrated water, from above the painted surface P, and prevents water from entering the boundary B. Prevent water from entering (see Figure 7). Therefore, the foamed sheep 21 of this embodiment, like the foamed sheep of the first embodiment, prevents the occurrence of rust at the sheet contact portion of the steel plate S, and also prevents the formation of rust at the boundary B between the foamed sheep 21 and the coating, which is prone to rust. The occurrence of rust can be effectively prevented.

Roughly speaking, FIGS. 8 to 11 show a third embodiment of the present invention, in which a foamed sheep 31 is a highly foamed sheep 32 and a thermally foamed sheep 3 having the same compositions as in both of the above embodiments, respectively.
3, and by coloring the material of either the highly foamed sheep 32 or the thermally foamed sheep 33, or by removing carbon so that it can be visually distinguished from the other. This is to prevent mistakes in the installation direction during construction, for example, heat foamed sheet 33
Carbon black is added as a coloring material, and the highly foamed sheep 32 is used as it is.

Therefore, the color of the surface of the foamed sheep 31 becomes darker than the other highly foamed sheep 32, so that the thermally foamed sheep 33.
33 can be instantly identified, and if these thermally foamed sheeps 33, 33 are arranged so as to be in contact with the steel plate S, this foamed sheep 31
can be applied so as to exhibit a predetermined rust prevention effect, and it is possible to eliminate mistakes in the installation of the foamed sheep 31 as shown in FIG. 11, and to reduce the number of man-hours and working time.

Incidentally, in each of the above embodiments, instead of the heat-foamed sheet, a thin closed-cell low-foamed sheet may be used.

Further, in each of the above embodiments, a tape-shaped foamed sheep with a rectangular cross section has been described, but the present invention can also be applied to various foamed sheeps having cross-sectional shapes other than rectangular.
´ As described in detail, the present invention is a foamed sheet that is placed in an unfoamed state at a predetermined location such as a joint that requires sealing, and is foamed to form a seal. The part of the sheet surface that comes into contact with the part to be sealed is covered with heat-foamed sheet or low-foamed sheet.By using this foamed sheet, it is possible to prevent corrosion of the steel plate in the sheet contact area, and also to protect the sheet from heat. Compared to sealing only with foamed sheep or low foamed sheep,
The required amount of Sheet 5 can be significantly reduced, resulting in weight and cost reductions, and the highly foamed Sheep acts as a cushioning material, mitigating external shocks and preventing the bond between the steel plate and the Foamed Sheep from peeling off. This effectively prevents dust and water from entering from the outside world.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a perspective view of a foamed sheep, FIG. 2 is a sectional view showing the foamed sheep placed in a sealing position, FIG. 3 is a cross-sectional view showing the heated and foamed state, FIGS. 4 to 7 show a second embodiment of the present invention, FIG. 4 is a perspective view of the foam seal, and FIG. 5 is a foam seal. 6 is a sectional view showing the state in which it is heated and foamed, FIG. 7 is an enlarged view of the main part of FIG. 6, and FIGS. 8 to 11 are the main parts. This shows the third embodiment of the invention, and the eighth embodiment
The figure is a perspective view of the foam seal, Figure 9 is a cross-sectional view showing the foam seal placed in the sealing position, Figure 10 is a cross-sectional view showing the foamed state after heating, and Figure 11 is the orientation of the foam seal. Fig. 12 and Fig. 13 show the conventional example, Fig. 12 is a sectional view showing the foam seal placed in the sealing position, and Fig. 13 is a heating seal. It is a sectional view showing a foamed state. 11.21.31...Foam seal, 12,22゜3
2... Highly foamed seal, 13.23.33... Non-foamed sealer, P... Painted surface, S... Steel plate, B...
··boundary. Figure 1 Figure 3. Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 11 Figure 10

Claims (3)

[Claims] (1) In a foaming sealer that is placed in an unfoamed state at a predetermined location such as a joint part that requires sealing and is foamed to form a seal, the portion of the surface of the unfoamed high foaming sealer that is sealed. 1. A foaming sealer characterized in that a region in contact with the foaming sealer is coated with a non-foaming sealer or a low-foaming sealer. (2) The foaming sealer according to claim 1, wherein the non-foaming sealer or the low-foaming sealer is thinner at the edges than at the center. (3) Either one of the non-foaming sealer, the low-foaming sealer, and the high-foaming sealer is made distinguishable from the other by coloring, carbon removal, etc. Foaming sealer as described in section.