JP2010024820A - Gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent yellowing due to penetration of sulfur components to a surface skin layer from a gasket body, in gaskets comprising the gasket body formed of a valcanized rubber material and a resin surface skin layer formed integrally with the surface layer part of the gasket body, and being fitted into joints between outer wall panels of a building. <P>SOLUTION: In the gasket 11 comprising the gasket body 4 and the surface skin layer 5 formed in the surface layer part 3 of the gasket body 4 through an adhesive layer 12, the adhesive layer 12 includes an intermediate base material layer formed of a metal foil for blocking the penetration of sulfur components from the gasket body 4 to the surface skin layer 5 and an outer layer comprising polyethylene to be applied to both sides of the intermediate base material layer, and at the same time as when it is valcanized by heating after extrusion molding, the polyethylene melts and adheres the intermediate base material layer, the gasket body 4 and the outer layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gasket attached to a joint between outer wall panels of a building.

  FIG. 1 shows an example of a conventional gasket, which is formed with a column 1, a lip 2 that is formed to project obliquely upward from both sides of the column 1, and a projection that protrudes on both sides from the upper end of the column 1. It consists of a surface layer 3 that faces the outside of the joint when the joint is mounted, a gasket body 4 for sealing (waterproofing), and a skin layer 5 that is integrally formed on the surface of the surface layer 3 and has weather resistance and design. The gasket body 4 is mostly made of a vulcanized rubber material such as EPM and EPDM, and the skin layer 5 is made of a rubber material such as olefin-based or styrene-based thermoplastic resin (TPE), chlorinated polyethylene (CPE), EPDM, etc. Yes. Moreover, in order to improve the adhesiveness of the skin material which consists of acrylic resin, ABS resin, AES resin, etc., and the gasket main body which consists of EPDM, what interposed the polyethylene layer between both is also known (patent document 1).

JP-A-2005-90178

  The conventional gasket shown in FIG. 1 has excellent sealing properties as well as weather resistance and design properties due to the gasket main body and the skin layer, but the sulfur content penetrates into the skin layer from the gasket main body made of vulcanized rubber material over time, and the skin There is a concern of yellowing the layer. As countermeasures, it is also possible to use organic peroxides instead of sulfur or sulfur compounds as cross-linking agents. In this case, odor is generated, or cross-linking is inhibited by intervening oxygen during cross-linking by heating. As a result, a surface tack with the surface becoming sticky is brought about, and in order to avoid the surface tack, a dedicated crosslinking furnace capable of removing oxygen at the time of crosslinking is required.

  Some gasket bodies are made of a thermoplastic resin material that does not contain sulfur. In this case, the problem of yellowing due to sulfur as described above does not occur, but the plastic material (oil) contained in the resin material is the skin layer. There is concern about deterioration of appearance.

  An object of the present invention is a gasket comprising a gasket main body and a skin layer integrally formed on the surface layer portion of the main body, and a contamination concern substance such as a crosslinking agent, a crosslinking accelerator or a plastic material penetrates from the gasket main body to the skin layer. It is intended to prevent the deterioration of the appearance quality due to the above.

The invention according to claim 1 is a gasket body made of a cross-linked thermosetting material or a thermoplastic resin material, and having a surface layer portion facing the outdoor side of the joint when the joint is mounted, and a surface layer portion of the gasket body In the gasket comprising the skin layer formed through the adhesive layer, the adhesive layer inhibits the penetration of the contaminants such as the crosslinking agent, crosslinking accelerator or plasticizer from the gasket body to the skin layer. It is characterized by comprising a material layer and an outer layer coated on both sides thereof and having adhesion to the gasket body and the skin layer.
Here, the thermosetting material is a material whose curing reaction is accelerated by heat, and the thermoplastic resin is a material that is plasticized by heat.

The invention according to claim 2 is characterized in that the gasket body of the invention according to claim 1 is made of a thermosetting material crosslinked with sulfur,
The invention according to claim 3 is characterized in that the intermediate base material layer 13 of the invention according to claim 1 or 2 is made of a material having an oxygen permeability of 120 cc / m ² · 24 hr · atm or less.
The invention according to claim 4 is characterized in that the outer layer of the adhesive layer of the invention according to claims 1 to 3 is polyethylene.

  According to the gasket of the first aspect of the present invention, the intermediate base material layer can be provided with weatherability and designability as well as sealing properties, and contamination of the gasket body from the gasket body to the skin layer, such as sulfur and plastic material. And has the effect of preventing yellowing or discoloration of the skin layer. In addition, when the intermediate base layer is made of a metal foil such as aluminum, the effect of inhibiting the penetration of substances of concern to the skin layer is great, but with a single layer, it is difficult to adhere to the gasket body or the skin layer. By coating with an outer layer having adhesiveness, adhesion to the gasket body or the skin layer is facilitated.

According to the gasket of the invention according to claim 2, it is vulcanized by heating after extrusion.
If a film of 120 cc / m ² · 24 hr · atm or less is used for the intermediate base material layer as in the gasket of the invention according to claim 3, the change of dye (migration contamination) due to the penetration of the contaminants of concern can be reduced. it can. Here, cc / m ² · 24 hr · atm indicates the permeation amount (cc) per square meter when 24 hours have passed at atmospheric pressure.

  According to the gasket of the invention of claim 4, when heated, the polyethylene is thermally melted, and the intermediate base material layer, the gasket main body and the skin layer are bonded.

Sectional drawing of the conventional gasket. Sectional drawing of the gasket which concerns on this invention. Sectional drawing of the intermediate | middle base material layer of the gasket shown in FIG. Sectional drawing of a test piece. Sectional drawing of a film.

  Hereinafter, a gasket according to an embodiment of the present invention will be described with reference to the drawings. In the figure, the same structural parts as those of the gasket shown in FIG.

  A gasket 11 shown in FIG. 2 is obtained by interposing an adhesive layer 12 between the gasket body 4 and the surface layer portion 3 in the gasket shown in FIG. The outer skin layer 5 is formed of a thermosetting material such as EPDM, EPM, urethane rubber, silicone rubber, natural rubber or the like crosslinked with an oxide or the like as a crosslinking agent. The skin layer 5 is made of, for example, olefin, styrene, urethane, ester, or the like. It is formed of a thermoplastic resin material. Further, as shown in FIG. 3, the adhesive layer 12 is coated on both sides of the intermediate base material layer 13 that inhibits the penetration of sulfur and plastic materials, which are contaminants, and the intermediate base material layer 13 and the gasket body. 4 and an outer layer 14 having adhesiveness with the skin layer 5, and the intermediate base layer 13 is formed of, for example, metal foil such as aluminum foil, nylon, ethylene vinyl alcohol copolymer (EVOH), polyethylene terephthalate (PET), or the like. The outer layer 14 is made of, for example, linear low density polyethylene (LLDPE). The intermediate base material layer 13 is not limited to the materials described above, and any material may be used as long as it inhibits the sulfur content and the penetration of the plastic material. The outer layer 14 is not limited to linear low-density polyethylene (LLPDE) as long as it has adhesiveness with the material forming the gasket body, surface layer portion, and intermediate base material layer, and any material can be used. Good. For example, a primer and an adhesive applied to the intermediate base material layer can also be used.

Experimental example 1
As shown in FIG. 4, a thickness made of olefin-based thermoplastic elastomer (TPO) through a film layer 17 on a base material 16 made of EPDM using JIS A hardness 70 sulfur as a vulcanizing agent. A test piece 19 having a width of 20 mm and a length of 50 mm was prepared by stacking 1 mm of color material 18 and pressing with a press. The film layer 17 is formed by laminating LLPDE on both sides of nylon having a thickness of 40 μm.

Next, the test piece 19 was subjected to a weather resistance test using a weather resistance accelerated tester (Metal Weather KU-R5CI-A) manufactured by Daipla Intes.
The test was performed on the test piece 19 under the conditions shown in Table 1 below: (1) UV irradiation, (2) darkness in the dark when UV irradiation was stopped, (3) condensation for 4 hours each (1), A total of 100 to 500 hours was repeated in the order of (2) and (3).

In the treatments (1) and (3), deionized water of ph 6-8, 10 ⁵ Ω · cm or more was sprinkled for 10 seconds before the treatment was started.

  About the test piece 19 after the above-mentioned weather resistance test, L *, a *, b * defined in JIS Z8729 are measured using a color computer, and the difference ΔL *, Δ * a, Δ * before and after the test is measured. b was determined, and the color difference ΔE * ab before and after the test was determined by the following equation (1). The results are shown in Table 2 below. In the table, 100 hr indicates the total time in which the above tests (1), (2), and (3) were repeated. The same total time is shown for 200 to 500 hours.

Experimental example 2
In the test piece 19 of Experimental Example 1, a test piece made of the same material as that of Experimental Example 1 was prepared except that the nylon constituting the film layer 17 was an ethylene vinyl alcohol copolymer EVOH having a thickness of 50 μm. Similarly, a weather resistance test was performed under the conditions shown in Table 1. Next, the color difference ΔE * ab at 100 to 500 hr was determined by the same method as in Experimental Example 1. The results are shown in Table 2 below.

Experimental example 3
In the test piece 19 of Experimental Example 1, the film layer 17 was vapor-deposited on the surface of a polyethylene terephthalate film (PET) 22 (total thickness of 12 μm with PET) as shown in FIG. Except for the laminated film 21 layer, a test piece similar to the test piece of Experimental Example 1 was prepared, and the weather resistance test was performed under the conditions shown in Table 1 as in Experimental Example 1. Next, the color difference ΔE * ab at 100 to 200 hours was determined by the same method as in Experimental Example 1. The results are shown in Table 2 below.

Comparative Example 1
In the test piece 19 of Experimental Example 1, a test piece excluding the film layer 17, that is, a test piece in which the color material 18 is laminated on the base material 16, was prepared, and the weather resistance test was performed under the conditions shown in Table 1 as in Experimental Example 1. Went. Next, the color difference ΔE * ab at 100 to 500 hr was determined by the same method as in Experimental Example 1. The results are shown in Table 2 below.

Comparative Example 2
In the test piece 19 of Experimental Example 1, a test piece made of the same material as that of Experimental Example 1 is used except that the film layer 17 is a single layer of a polyethylene (PE) film having a thickness of 30 μm. A weather resistance test was performed under the conditions. Next, the color difference ΔE * ab at 100 to 200 hours was determined by the same method as in Experimental Example 1. The results are shown in Table 2 below.

Reference Example A weather resistance test was performed on the color material alone of the test piece 19 of Test Example 1 (a test piece formed entirely of an olefin-based thermoplastic elastomer (TPO)) under the conditions shown in Table 1 as in Test Example 1. . Next, the color difference ΔE * ab at 100 to 500 hr was determined by the same method as in Experimental Example 1. The results are shown in Table 2 below.

  As shown in Table 2, the test piece of the reference example made only with TPO has a small surface discoloration, whereas the test piece of Comparative Example 1 shows the contamination by the sulfur content of EPDM as a result of the weather resistance test. The discoloration that penetrated TPO, deposited on the surface and yellowed was large. Further, as shown in Comparative Example 1, even if a polyethylene film was interposed between the base material 16 and the color material 18, there was no effect of preventing the migration of contaminants, and the surface yellowed greatly. On the other hand, Experimental Examples 1 to 3 were more effective in preventing the migration of contaminants from the base material 16 to the color material 18 than in Comparative Examples 1 and 2, and the discoloration of the color material surface was greatly reduced. In Experimental Example 3, the film is made of aluminum vapor-deposited PET and has a two-layer structure of an aluminum layer and a PET layer. However, sufficient effects can be achieved with aluminum alone or PET alone.

  Table 3 is described in “New Food Packaging Film” on page 187 and Table 8-1 issued by Nikkan Co., Ltd. on April 1, 1999, and “various plastic films” obtained based on JIS K 7126. The oxygen permeability of various plastic films extracted from “Oxygen / Water Vapor Permeability”.

When nylon, ethylene vinyl alcohol copolymer EVOH, and aluminum-deposited polyethylene terephthalate PET are used for the intermediate base material layer, the color difference ΔE * ab is small as shown in Table 2, but these films are shown in Table 3. In addition, compared with ethylene / vinyl acetate copolymer and low-density polyethylene, the oxygen permeability is greatly reduced. From this, it is understood that a film having a low oxygen permeability tends to have a small color difference ΔE * ab. . In particular, polyethylene terephthalate, stretched nylon, ethylene vinyl alcohol copolymer, aluminum foil laminated film in the table, whose oxygen permeability is 120cc / m ² · 24hr · atm or less, are other ethylene vinyl acetate copolymers, Compared to low-density polyethylene, the oxygen permeability is remarkably small, and the color difference is remarkably small.

  In addition, although the oxygen permeability of various films may change a little with thickness, even if it changes, it is thought that it does not rise as much as ethylene vinyl acetate copolymer and polyethylene.

1 .. Column part 2 .. Lip 3 .. Surface layer part 4 .. Gasket body 5 .. Skin layer 11 .. Gasket 12 .. Adhesive layer 13 .. Intermediate base material layer 14 .. Outer layer 16. 17, 21 ... Film layer 18 Color material 19 Test piece 22 PET
23 .. Aluminum 24 .. LLDPE

Claims (4)

  A gasket body 4 made of a cross-linked thermosetting material or a thermoplastic resin material and having a surface layer portion 3 facing the outdoor side of the joint when the joint is mounted, and an adhesive layer 12 on the surface layer portion of the gasket body 4 In the gasket 11 composed of the skin layer 5 formed through the intermediate layer, the adhesive layer 12 inhibits the penetration of the contaminants such as a crosslinking agent, a crosslinking accelerator or a plastic material from the gasket body 4 to the skin layer 5. A gasket comprising a base material layer 13 and an outer layer 14 which is coated on both sides thereof and has adhesiveness to the gasket body 4 and the skin layer 5.   The gasket according to claim 1, wherein the gasket body (4) is made of a thermosetting material crosslinked with sulfur. The gasket according to claim 1, wherein the intermediate base material layer 13 is made of a material having an oxygen permeability of 120 cc / m ² · 24 hr · atm or less.   4. The gasket according to claim 1, wherein the outer layer 14 of the adhesive layer 12 is polyethylene.