JP2898573B2 - Foundation base sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base work sheet excellent in workability and capable of achieving a hermetic seal between the base concrete and the base and preventing corrosion of the base for a long period of time.

[0002]

2. Description of the Related Art Higher airtightness of buildings such as wooden buildings in cold regions has become an important issue. Various gaps are randomly formed between the base concrete and the base on the basis of the roughness, non-linearity, and the like, and a gap of about 10 mm may be formed. Therefore, measures have been taken to seal by interposing a base sheet made of an airtight sheet between the base and the base. Conventionally, as a sheet, a laminate of a polyethylene film and a rubber-based foam sheet via an adhesive is used. Was known. Such a laminate is intended to prevent corrosion of the base by a moisture seal in addition to the hermetic seal.

[0003] However, the conventional base sheet has a problem that the hermetic seal and the moisture seal are inferior in durability. Thick rubber foam sheets are generally used. For example, a foam sheet thickness of more than 10 mm may be required to cope with gaps. Although there is a slight improvement over previous rubber sheet airtight sheets, construction is still ongoing. There were also problems with poor sex. In other words, there is a problem that a lot of time and labor are required for the perforation process for mounting the bolts on the base, which are protruded from the foundation concrete, for mounting.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to develop a base sheet which is excellent in long-term durability of an airtight seal and a water seal and is excellent in workability.

[0005]

SUMMARY OF THE INVENTION The present invention is an airtight sheet disposed between a foundation concrete and a base, wherein a rubber-based foamed layer having an open-cell structure has an interval at which at least two lines are disposed within the width of the base. Polyolefin having a dispersed or film-form ethylene-vinyl acetate copolymer on the adhesive surface with the adhesive layer through a water-resistant adhesive layer provided on both surfaces of a support substrate made of a thermoplastic resin in a striped state An object of the present invention is to provide a base sheet which is characterized by being adhered and fixed to a system sheet.

[0006]

According to the above construction, a base base sheet which is excellent in the long-term durability of the airtight seal and the moisture seal, can easily and efficiently perform the perforating process for mounting to the bolt, and is excellent in the workability is obtained. That is, the present inventors have conducted intensive studies to develop the above-mentioned sheet, and found that the non-polar polyethylene film has poor adhesion and peels off at the interface with the adhesive layer, resulting in hermetic sealing and moisture. It has been found that the sealability is easily impaired.

[0007] In addition to the above, the inventors of the present invention have proposed that the base base sheet has dimensions such as moisture absorption, drying, dimensions due to environmental changes such as heat, etc., based on the material difference between the base concrete and the base made of wood, steel frame or the like. There is a specific problem that a difference is caused in the change, and the difference affects the entire base base sheet interposed by the bolt tightening method and easily causes wrinkles, peeling, deformation and the like in the constituent members such as the foam layer and the sheet. I also found out.

According to the present invention described above, the polyolefin sheet is supported by a substrate made of a thermoplastic resin, in addition to being adhered and fixed in a favorable state of adhesion to the adhesive layer based on the ethylene / vinyl acetate copolymer component of the polyolefin sheet. The double-sided water-resistant pressure-sensitive adhesive layer achieves reliable and good adhesion at each interface between the sheet and the foam layer and its long-lasting performance, and can prevent dimensional changes due to environmental changes between the foundation and base after bolting. The influence based on the difference is mitigated to prevent wrinkles, peeling, and deformation of the foamed layer and the polyolefin-based sheet for a long time, and stable airtight sealing and prevention of corrosion of the base by the moisture seal are maintained for a long time.

In addition, the perforating process for mounting on the bolt is performed only on the layer made of the polyolefin-based sheet, and can be easily and efficiently performed because it does not involve a foamed sheet layer as in the prior art. Excellent workability as well as weight reduction. Further, in the past, moisture penetrated from the gap between the bolt periphery and the base base sheet propagated through the sheet and corroded the base, but in the present invention, the foam layer was striped away from the bolt, and the foam layer was separated from the bolt. Since a gap is formed between the polyolefin-based sheet and the base through the base, the propagation of the infiltrated water to the base can be prevented, and the prevention of corrosion of the base can be further lengthened.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The base base sheet of the present invention has a rubber-based foam layer having an open-cell structure in a striped state in which at least two strips are arranged within the width of the base, on both surfaces of a support substrate made of a thermoplastic resin. It consists of an airtight sheet bonded and fixed to a polyolefin-based sheet having a dispersed or film-like ethylene-vinyl acetate copolymer on the adhesive surface with the adhesive layer through the provided water-resistant adhesive layer. It is for placing between.

FIG. 1 shows an example of a base sheet of the present invention. 1 is a polyolefin-based sheet, 11 is its base layer, and 12 is an adhesive surface layer with an adhesive layer. Reference numeral 2 denotes an adhesive layer, and reference numerals 21 and 23 denote water-resistant adhesive layers provided on both surfaces of the support substrate 22. 3 is a rubber foam layer. In addition, 4 is a foundation concrete and 5 is a base. Therefore, FIG. 1 shows a state in which the foundation sheet of the present invention is arranged between the foundation concrete and the foundation.

As the polyolefin-based sheet, a sheet having an ethylene-vinyl acetate copolymer in a dispersed state or a film state on an adhesive surface with the adhesive layer is used for the purpose of maintaining a good adhesion state with the adhesive layer for a long period of time. Can be Therefore, as such a sheet, a single-layer film made of an ethylene / vinyl acetate copolymer can be used as it is.

The polyolefin sheet which can be preferably used in terms of airtightness and water-blocking properties is, as shown in the figure, a base layer 11 made of a polyolefin such as polyethylene or polypropylene which is chemically stable and hardly permeates moisture. Examples include a laminate with the adhesive surface layer 12 having the vinyl copolymer in a dispersed state or a film state. Its formation is
For example, it can be carried out by an appropriate method such as a method of forming a laminate film by coextrusion of a mixture of a polyolefin and an ethylene / vinyl acetate copolymer or an ethylene / vinyl acetate copolymer.

In the above, when the adhesive surface layer of the laminate is formed as a mixed layer with a polyolefin containing an ethylene / vinyl acetate copolymer in a dispersed state, the content of the copolymer depends on the adhesion to the adhesive layer. From the viewpoints such as above, 5% by weight or more, especially 10% by weight or more, particularly 15 to 95% by weight is preferable.

The thickness of the polyolefin-based sheet can be determined as appropriate, but is generally 1 mm or less, preferably 10 to 500 μm, particularly 50 to 50 μm, in view of workability such as bolt penetration.
It is 400 μm. When the polyolefin-based sheet is formed as a multilayer body of the above-described base layer and the adhesive surface layer, it is preferable that the base layer occupies half or more of the thickness from the viewpoint of water shielding and the like, and the adhesive surface layer is an adhesive layer. From the viewpoint of adhesion to the like, it is preferable to have a thickness of 5 μm or more, especially 10 to 250 μm.

The surface of the polyolefin-based sheet to be bonded to the pressure-sensitive adhesive layer can be subjected to a proper adhesive strength improving treatment such as a corona discharge treatment. When forming the polyolefin-based sheet, appropriate additives such as an antioxidant and a filler can be added as necessary.

As the pressure-sensitive adhesive layer, a pressure-sensitive adhesive layer provided on both sides of a support substrate made of a thermoplastic resin is used. By bonding and fixing with a double-sided adhesive type using such a support base material, a difference in dimensional change due to an environmental change between the base concrete and the base after bolting is absorbed, and wrinkles are formed on the foam layer or the polyolefin-based sheet. It prevents the occurrence of peeling, deformation, etc. for a long period of time, and maintains the airtight seal and the moisture seal for a long period of time.

The thermoplastic resin forming the supporting substrate is not particularly limited, and an appropriate resin can be used. Preferably, it is excellent in water resistance. Examples include ester polymers such as polyester, olefin polymers such as polypropylene, vinyl polymers such as polyvinyl chloride and polystyrene, fluorine polymers such as polytetrafluoroethylene and polyvinyl fluoride, and other amide polymers. And imide-based polymers and carbonate-based polymers.

The supporting substrate may be formed as a blend or a laminate of two or more thermoplastic resins, and the thickness can be appropriately determined according to the application location of the base sheet. In general, the thickness is 500 μm or less, especially 5 to 300 μm, especially 10 to 200 μm.

The pressure-sensitive adhesive layers provided on both sides of the support substrate can be formed of a suitable water-resistant pressure-sensitive adhesive substance,
Any known water-resistant pressure-sensitive adhesive such as a silicone-based pressure-sensitive adhesive can be used. The thickness of the adhesive layer can be appropriately determined according to the application location of the base sheet, and is generally 500 μm or less, preferably 5 to 400 μm, particularly 10 to 300 μm. The type of the adhesive layer may be different between the front and back of the support base.

The foam layer is formed of a rubber foam having an open cell structure. With this, when bolting the foundation concrete and the base, the air contained in the rubber-based foam layer is pushed out and compressed based on the open cell structure, the repulsion force against the compression is small, the airtight sealing property and the moisture Good sealing performance.

Further, at least two rubber-based foam layers are arranged in a stripe state at a predetermined interval within the width of the base. Accordingly, the base can be stably arranged without tilting, and the bolt penetrating portion in the foundation concrete can be made only of the polyolefin-based sheet. The number of rubber-based foam layers provided can be an appropriate number of two or more depending on the base width and the like. In the streaks where the bolts penetrate,
It is preferable not to dispose the rubber-based foam layer, and it is preferable to dispose the rubber-based foam layer as symmetrically as possible.

As the rubber-based foam forming the foam layer,
For example, polyolefin rubber such as ethylene-propylene copolymer, butyl rubber, SBR, NR, NBR
A suitable rubber-based foam having an open-cell structure such as a foam, a urethane rubber, an acrylic rubber, or a blend thereof can be used. The expansion ratio of the foam can be appropriately determined according to the compressibility and the like. Generally, 2 to 100 times, especially 3 to 50
Double, especially 5 to 30 times expansion ratio is used.

The rubber foam may have an open cell structure by an appropriate method. By the way, the rubber foam of the open-cell structure, for example, a foaming agent and a softening agent, an appropriate compounding agent such as a filler or a crosslinking agent is added to the rubber-based polymer as necessary, and the mixture is heated to a predetermined temperature. It can be obtained by a foaming method or the like.

The thickness of the rubber-based foam layer is appropriately determined according to the size of a gap formed between the base and the base. In general, the thickness is 3 mm or more, especially 5 mm or more, especially 7 to 30 mm. The width of the rubber-based foam layer is appropriately determined depending on the base width, the number of arrangement layers of the foam layer, and the like.
mm or more, especially 7 to 50 mm. The rubber foam layer may be formed as a superimposed layer of two or more foams.

Example 1 Low density polyethylene (Mirason 6 manufactured by Mitsui Petrochemical Co., Ltd.)
7) and a mixture containing 20% by weight of an ethylene / vinyl acetate copolymer (manufactured by Mitsui Petrochemical Co., Ltd., Evaflex 1407) was formed into a film through a two-layer extruder into a film having a thickness of 200 μm and a width of 200 μm. A 100 mm laminated film (each layer having the same thickness) is subjected to corona discharge treatment on the surface of the copolymer-containing layer via a double-sided adhesive layer having two 10 mm square rubber foam layers (length 10 m) attached thereto. The base sheet was obtained by bonding and fixing.

In the above, as the rubber-based foamed layer, an open-cell structure having an ethylene-propylene copolymer expansion ratio of about 10 times was used. The two strips were arranged at both ends of the laminate film. On the other hand, as an adhesive layer, about 64 μm thick on both sides of a polyester film having a thickness of 12 μm.
Provided with an acrylic pressure-sensitive adhesive layer.

Example 2 A base base sheet was obtained in the same manner as in Example 1 except that an acrylic-based pressure-sensitive adhesive layer was used instead of the acrylic-based pressure-sensitive adhesive layer.

Comparative Example A low-density polyethylene was used in place of the laminate film, and the adhesive surface was 200 μm thick by corona discharge treatment.
Except for using a single-layer film of m, a base base sheet was obtained in the same manner as in Example 1.

Evaluation Test Adhesion When the base sheets obtained in Examples and Comparative Examples were left in a low-temperature atmosphere at 0 ° C., the base sheets of Comparative Example
After a lapse of time, peeling was observed at the interface between the film and the pressure-sensitive adhesive layer. However, in the base base sheets of Examples 1 and 2, even after 30 days had passed, no peeling point was observed at each bonding interface, and the adhesive force (180 degree peel) Also maintained the initial bond strength.

Practicality The base base sheet obtained in Examples 1 and 2 is placed between the base made of the base concrete and the 100 mm square material with the rubber-based foam layer facing upward, and the base is not bolted to the base to give a natural atmosphere. When observed after standing for 30 days, no lifting or displacement of the base was observed, and there were no practical obstacles due to the striping of the foamed layer, which was a good result.

[0032]

According to the present invention, the sheet layer and the foam layer can be fixed for a long time in a good adhesion state via the double-sided pressure-sensitive adhesive layer with the base material, and the difference in dimension between the base and the base due to heat or the like can be reduced. Peeling or the like in the sheet layer or foam layer can be prevented for a long time, and stable airtight seal and prevention of corrosion of the base by moisture seal can be maintained for a long time. In addition, since the foam layer is not involved in the perforation process for mounting on the bolt, the process is performed only on the sheet layer, so that the process can be easily and efficiently performed, and the foam layer is reduced in weight and excellent in workability.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment.

[Explanation of symbols]

1: polyolefin-based sheet (11: base layer 12:
Adhesive surface layer) 2: adhesive layer (21, 23: water-resistant adhesive layer 22: support base material) 3: rubber foam layer 4: foundation concrete 5: base

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-220925 (JP, A) JP-A-53-61118 (JP, A) JP-A-3-149235 (JP, A) JP-A-4- 309635 (JP, A) Japanese Utility Model Showa 50-154611 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04B 1/64

Claims (1)

(57) [Claims] 1. An airtight sheet disposed between a foundation concrete and a base, wherein a rubber-based foam layer having an open-cell structure is formed from a thermoplastic resin in a striped state at intervals of at least two lines within the width of the base. Through a water-resistant pressure-sensitive adhesive layer provided on both sides of a supporting base material, and bonded and fixed to a polyolefin-based sheet having a dispersed or film-like ethylene / vinyl acetate copolymer on an adhesion surface with the pressure-sensitive adhesive layer A basic base sheet characterized by becoming.