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Sealing method

A technology of sealing materials and tapes, which is applied in the field of sealing discontinuous parts and sealing seams, and can solve problems such as difficult appearance

Inactive Publication Date: 2005-08-03
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, when the sealing shape is required to be consistent with the shape of the bottom surface of the groove to some extent, only a barrier layer with low rigidity can be used.
Therefore, it is difficult to obtain a satisfactory appearance, especially a smooth coating surface, by using such a sealing method made by multi-layer sealing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Scotch 898 tape (trade name, manufactured by Sumitomo 3M Ltd.) was pasted on the bottom of the groove of the test piece so that the tape was superimposed on the recess simulating spot welding marks, and sufficiently pressed to bond. The aforementioned seal making (fused sealant) is glued to the top surface of the strip.

[0058] Consider the coating step of an automobile. First, the test piece was kept at 120° C. (material temperature) for 20 minutes using a pre-drying step called pre-curing the electrodeposition-coated steel sheet. Heat to melt the above molten sealant and liquefy it to cover the roof groove. Next, an automotive acrylic solid paint (crosslinked with melamine) generally called an intermediate coat paint is sprayed on the molten sealant, and cured at 140° C. (material temperature) for 30 minutes. An automotive acrylic solid paint (crosslinked with melamine) called a topcoat was then sprayed and cured at 140°C (material temperature) for 30 minutes. Bot...

Embodiment 2

[0060] Test in the same manner as in Example 1, except that Scotch 363 adhesive tape (trade name, total thickness is 190 microns, with aluminum foil and glass cloth as substrate, with silicone pressure-sensitive adhesive as coating) instead Scotch 898 tape (trade name, a fine filament tape). In addition, the substrate of the pressure-sensitive adhesive tape has a tensile elastic modulus of 350 MPa when heated at 120° C. (measured at a stretching rate of 50 mm / min, the substrate width is 24 mm, and the distance between the clamps is 100 mm).

Embodiment 3

[0062] Test in the same manner as in Example 1, except that Scotch 898 adhesive tape (trade name, a filament tape) is replaced with a pressure-sensitive adhesive tape, which is obtained by using an acrylic pressure-sensitive adhesive with a thickness of 250 microns. Prepared by coating a polyethylene terephthalate (PET) film (manufactured by Teijin Ltd.) with a thickness of 200 µm. In addition, the substrate of the pressure-sensitive adhesive tape has a tensile elastic modulus of 1000 MPa when heated at 120° C. (measured at a stretching rate of 50 mm / min, the substrate width is 24 mm, and the distance between the clamps is 100 mm).

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Abstract

A sealing method comprising affixing an adhesive tape (e.g., a pressure-sensitive adhesive tape) to an adherend to be sealed, placing a sealing article that contains a hot-melt / fluidizable thermosetting sealing material on the adhesive tape, and heating the sealing article to a temperature sufficient to allow the article hot-melt / fluidize and thermoset. The adhesive tape has a substrate that suppresses penetration of air trapped in the affixing step between the adherend and adhesive tape into the sealing article.

Description

field of invention [0001] The present invention relates to methods of sealing, in particular to methods of sealing discontinuities, and more particularly to methods of sealing seams. Background of the invention [0002] Known in the prior art is a molten sealing tape of a molded sealing material which can be liquefied by heating and solidified by heating, and which can be used to seal discontinuous parts such as car seams (for example, formed by steel plates). seam). These mold sealing materials are disclosed in, for example, Japanese Unexamined Patent Publication (Kokai) 62-48787, US Patent 5,086,088, Japanese National Patent Publication (Kohyo) 9-505335, Japanese Unexamined Patent Publication (Kokai) 2000-17248, and the like. Since the molded sealing material seals the discontinuity, it is first required to be able to melt and liquefy by heating. The sealing material then conforms to the shape of the discontinuities and adherends, such as depressions, pockets and protrus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24C08L63/00C08L77/00C09J5/06C09J163/00C09K3/10
CPCC09J5/06C09J2463/00C08L63/00C09K3/10C08L77/00C09J2477/00C09J163/00C08L2666/20
Inventor 北野修一篠崎光太郎弘重裕司
Owner 3M INNOVATIVE PROPERTIES CO
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