JPS6228478A - Water-proofing sheet having pressure-sensitive adhesive layer - Google Patents

Abstract

PURPOSE:To provide the titled sheet resistant to the breakage of the sheet caused by the cracking and deformation of substrate, by applying a pressure-sensitive adhesive layer to a surface of a rubber sheet dipping a non-woven cloth completely in the pressure-sensitive adhesive layer in an impregnated state and contacting a thermoplastic resin film closely to the surface of the non-woven cloth. CONSTITUTION:A pressure-sensitive adhesive layer 3 is applied to a surface of the rubber sheet 2, and a non-woven cloth 4 is dipped completely in the pressure-sensitive adhesive layer in a state containing the pressure-sensitive adhesive agent impregnated into the opening area between the fibers. A thermoplastic resin film 5 is applied closely to at least one surface of the non-woven cloth 4. The non-woven cloth is the one having an areal density of 10-70g/m<2>, especially 15-50g/m<2> and a tensile strength of 0.5-15kg/5cm, especially 1-10kg/5cm, and a film of 0.01-0.1mm thick is applied to one surface of the non-woven cloth. The reinforcing material 6 produced above follows the cracking and deformation of the substrate and prevents the breakage of the sheet. The migration of the oiling agent in the lower pressure-sensitive adhesive layer 3b to the rubber sheet can be inhibited by the presence of the film to improve the dimensional stability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a waterproof sheet, and more particularly to a waterproof sheet with an adhesive layer that can be used for waterproofing work on roofs, floors, and walls of buildings, peripheral walls of subways, and the like.

(Prior art) A typical example of a conventional waterproof sheet is a rubberized asphalt sheet. This sheet is made of a mixture of rubber and asphalt, has appropriate elasticity, and has excellent durability and weather resistance. Due to its excellent properties, it is used in various waterproofing constructions.

In addition to these waterproof sheets, there is a material called asphalt roofing material, which is made of a rubberized asphalt sheet with a nonwoven or woven fabric made of glass fiber, polyester fiber, etc. as a reinforcing material. For example, Special Publication No. 50-232
This method is disclosed in Japanese Patent Publication No. 22 or Japanese Patent Publication No. 52-9928.

On the other hand, instead of the waterproof sheet using the above-mentioned rubberized asphalt composition, various adhesives can be used on one side of the base material such as ethylene-propylene terpolymer vulcanized sheet 1-3 vinyl chloride sheet 1-1 or polyolefin sheet. The waterproof sheet with the layer adhered to it is widely used because it adheres well even to uneven substrates and is easy to install. especially,
When using a rubber thread bundle vulcanized mixture as an adhesive layer, increasing the thickness of the adhesive layer and making it flexible,
Sufficient adhesive area can be obtained on the concave curved portion of the base. As such a waterproof sheet with a sticky layer, for example, Japanese Patent Application Laid-Open No. 58436
It is disclosed in Publication No. 24G.

(Problem to be solved by the invention) However, these asphalt tarpaulins are generally weak against external damage, and it is necessary to take sufficient care not to damage them during construction. The elongation of the sheet becomes small, and when it is attached to a waterproof base surface, it cannot sufficiently follow the deformation such as expansion or contraction of the base surface, so if a crack occurs in the base surface, the sheet may also crack or break. This had the disadvantage of causing the phenomenon of zero span tension and impairing the waterproof function.

On the other hand, a waterproof sheet with an adhesive layer has the disadvantage that the oil agent, which is a compounding agent of the adhesive layer, migrates to the base material such as a vulcanized rubber sheet and swells the base material, causing a large dimensional change in the waterproof sheet. was there.

For this reason, a waterproof sheet laid exposed on the underlying surface in the summer would have wrinkles, which was unfavorable in terms of appearance.

The present invention deals with the above-mentioned situation, and even if cracks occur in the base, by damaging some of the members constituting the tarpaulin sheet, the entire tarpaulin sheet is prevented from being damaged and retains its waterproof function, and the adhesive layer The object of the present invention is to provide a waterproof sheet with an adhesive layer that improves the dimensional stability of the waterproof sheet by preventing migration of the oil agent contained in the waterproof sheet.

(Means for Solving the Problems) That is, the present invention is characterized in that, in a waterproof sheet with an adhesive layer in which an adhesive layer is laminated on one side of a rubber sheet, a nonwoven fabric is placed in the adhesive layer with an adhesive material. The waterproof sheet has an adhesive layer that is completely buried in a permeated state and is made of a thermoplastic resin film adjacent to at least one side of the nonwoven fabric, and the rubber sheet gives the waterproof sheet a large elongation and prevents cracks in the base. It follows deformation, prevents damage to the sheet, imparts a semi-permanent waterproof function, and also
The non-woven fabric embedded within the waterproof sheet provides appropriate rigidity to facilitate installation, and the thermoplastic resin film adjacent to the non-woven fabric is a tackifier rubber such as oil that is blended into the adhesive layer. This prevents the rubber sheet from swelling by preventing the rubber sheet from moving toward the sheet side, thereby stopping dimensional changes in the waterproof sheet 1 to 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The waterproof sheet with an adhesive layer of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a waterproof sheet with an adhesive layer according to the present invention;
FIG. 2 is a sectional view of a waterproof sheet without showing other embodiments of the present invention, and the waterproof sheet 1 (1) with an adhesive layer of the present invention has an adhesive layer on one side of a rubber sheet (2). It has a structure in which (3) is adhered. The adhesive layer (3) contains a nonwoven fabric (
4) is located approximately in the center of the adhesive layer (3) in a buried state, and the material of the adhesive layer (3) has invaded the opening area between the fibers of the nonwoven fabric (4). The thermoplastic resin film (5) is in close contact with the upper surface of the nonwoven fabric (4), but in this case, at the interface between the film (5) and the nonwoven fabric (4), there is an adhesive layer oozing from the nonwoven fabric (4). Due to the material (3), the thermoplastic resin film (5) is tightly adhered to the nonwoven fabric (4). Moreover, the film (
5) is the lower adhesive layer (
This prevents the tackifier such as oil contained in 3b) from migrating to the rubber sheath h (21).

In this case, the upper adhesive layer (
The tackifier mixed in 3a) is the rubber sheet (2)
Since it is unavoidable that the transition to
This prevents the rubber sheet (2) from swelling and deforming.

In the adhesive layer (1) waterproof sheet (1) shown in Figure 2, the position of the nonwoven fabric (4) embedded in the adhesive layer (3) is relatively above the center part. The thickness of the upper adhesive layer (3a) is reduced to form a rubber sheet (2+
The mouth becomes smaller due to swelling.

In the present invention, a major objective is not only to prevent dimensional changes due to swelling of the rubber sheet (2), but also to follow the deformation of the underlying surface. Therefore, it is important to embed a reinforcing material (6) made of a nonwoven fabric (4) and a film (5) in close contact with each other in the adhesive layer (3). Rubber Seat 1- (Since it is necessary to impart a semi-permanent waterproof function only to 2+, it is necessary to sacrifice the swelling of 2+ to a certain extent).

Since the reinforcing material (6) needs to directly bear the stress caused by deformation such as cracks in the base, it is preferable to position it as below the adhesive layer (3) as possible.
- (2) swells, so its position is as shown in Figures 1 and 2.
It has become clear that the center or substantially upper side of the adhesive layer (3) shown in the figure is preferable. In particular, the thickness of the upper adhesive layer (3a) is preferably about 0.07 to 0.31 as a result of experiments. ) and film (
5) The adhesive strength within is also maintained at a high level.

Moreover, the peeling state is not an interfacial failure but a cohesive failure.

The rubber sheet 2) used in the waterproof sheet of the present invention includes natural rubber, polybutadiene, polyisoprene, butyl rubber,
Use general-purpose rubbers such as chloroprene rubber, styrene-butadiene copolymer rubber, ethylene-polymer cobylene polymer, thermoplastic elastomers such as thermoplastic styrene-butadiene copolymers, or blends thereof. By adding a vulcanizing agent, a vulcanization accelerator, etc. to these, it becomes unvulcanized or vulcanized, and cracks in the base cause it to become a nonwoven fabric (4) and a film (5). Even if the IIi bang (6) is damaged, the rubber sheet (2) itself will not be damaged.

The above-mentioned rubber sheath 1- (21 can also be used in various colors such as sodomy, for example, colored rubber sheaths 1- such as white and green.

The thickness of the rubber sheet (2) is 0.3 to 1.0 mm.
It is.

Further, the adhesive layer (3) is an unvulcanized product having basically the same composition as the rubber sheet 1-(2), and in order to increase the adhesiveness, it may be added with, for example, extender oil, chromanindene resin, A tackifying agent such as an oil-soluble phenol resin or Ishiura fish hydrocarbon resin can be added, and the amount added is 50 to 400 parts by weight, preferably 100 to 300 parts by weight, based on 100 parts of the polymer component. If the amount is less than 50 parts by weight, the adhesive layer will be poor and the adhesiveness will be poor, while if it exceeds 400 parts by weight, the rubber sheet (2) will swell prematurely and the heat resistance of the adhesive layer will decrease. In addition, as mentioned above, the thickness of the upper adhesive layer (3a) is 0.07 to 0.3.
wrwb, and when it is less than O, O'bm, the dimensional change due to swelling of the rubber sheet 2) is small, but the adhesive force between the rubber sheet (2) and the film (5) is lacking;
If it exceeds 3 cranes, the dimensional change of the waterproof sheet becomes large.

Further, the nonwoven fabric (4) constituting the reinforcing material (6) is obtained by known means using polyester, polyamide, polyolefin, polyvinyl alcohol, aromatic polyamide, glass fiber, etc., and has a basis weight of 10. ~70
g/m', preferably 15-50 g/m'', tensile strength 0
．． 5-15kg/5cm, preferably 1-10kg/
It consists of 5 cm.

On the other hand, the thermoplastic resin film (5) is made of ethylene polymer,
It is made of ethylene/vinyl acetate copolymer, polypropylene, etc. and has a thickness of 0.1 mm or less. If the thickness exceeds 0.1 mm, the strength of the reinforcing material (6) will increase and cause cracks in the ground. It becomes impossible to follow.

Note that the tensile strength of the film (5) is smaller than that of the nonwoven fabric (4).

(Function) Due to the presence of the reinforcing material (6), the waterproof sheet (1) has rigidity, which makes it easy to install on the base surface. (6
) is torn apart by cracks in the substrate, but the rubber sheet (
2) It becomes possible to follow the base. Moreover, the presence of the film (5) limits the amount of tackifier that composes the adhesive layer (3) that transfers to the rubber sheet (2).
Dimensional changes in the waterproof sheet 11 due to swelling of the rubber sheet (2) are reduced.

(Example) While winding up the release paper wrapped around a roll, apply the glue for the adhesive layer shown in Table 1 thereon, and then apply the adhesive layer glue shown in Table 1 on the release paper, and then apply the adhesive layer adhesive shown in Table 1 on the release paper. / g, a tensile strength of about 4 kg/5 cm, a non-woven fabric made of glass fiber with a thickness of about 0.15 cm, and a polyethylene film with a thickness of about 0.021 m are superimposed and inserted between the above rolls. The reinforcing material was laminated with glue. Next, after applying the above glue onto this laminate, a 0.7 mm thick vulcanized rubber sheet obtained from the rubber compound shown in Table 1 was held between a pair of rolls in the same manner as described above. A waterproof sheet with an adhesive layer shown in FIG. 1 or 2 was obtained.

The thickness of the lower adhesive layer (3b) of the above waterproof sheet is 0°15
Is the upper viscosity between the rubber sheet and the film 4f constant at 1■?
Layer thickness is 0.23am, O, 12mm, 0.07am
There are three types.

In addition, as a comparative example, one having the same structure as the above example but with a thickness of 9.4 mm and 0.05+n as an upper adhesive layer,
and thickness 0.4 without non-woven fabric and film reinforcement.
A waterproof sheet was obtained consisting of two layers: a 3 mm, O, 19 dragon adhesive layer and a vulcanized rubber sheet similar to the above.

The respective structures of the waterproof sheets obtained by the above method are shown in Table 3.

Table 3: These waterproof sheets were cut into 300 x 5 QH pieces and placed in an oven at 80°C to determine dimensional changes.

The results are shown in FIG.

According to this, when the thickness of the upper adhesive layer between the rubber sheet and the film becomes smaller, the dimensional change of the waterproof sheet disappears and becomes stable after about 5 days. On the other hand, in the case of a waterproof sheet in which the reinforcing material is not embedded in the adhesive layer, the dimensional change of the waterproof sheet is not stable even after 30 days have passed, even if the thickness of the adhesive layer is small.

Furthermore, the results of the adhesion between the rubber sheet and the film of the waterproof sheet and the state of destruction are shown in Table 3.

According to this, when the thickness of the adhesive layer is about 0.05 mm, the adhesive strength between the rubber sheet and the film is low, and moreover, the interface is broken.

Next, the waterproof sheet shown in Example 1 above, a 0.7-thick vulcanized rubber sheet constituting this, and a 0.1-thick reinforcing material made by laminating and adhering nonwoven fabric and film with glue. Cut each into 50mm x 200m++,
The tensile strength-elongation characteristics were measured at room temperature and at a tensile speed of 100 mm/min. The results are shown in FIG.

According to this, when a waterproof sheet is stretched beyond a certain value, only the reinforcing material breaks, but the vulcanized rubber sheet continues to deform, and the waterproof sheet itself does not break. Therefore, even if the reinforcing material is destroyed due to cracks in the base after the waterproof sheet of the present invention is laminated to the base, the rubber sheet and the adhesive layer are integrated, follow the base, and maintain waterproofness.

(Effects of the Invention) As described above, the waterproof sheet with adhesive layer I of the present invention has a reinforcing material made of a thermoplastic resin film and a nonwoven fabric embedded in the adhesive layer laminated on one side of a rubber sheet, and is made of a nonwoven fabric. An adhesive is introduced into the opening area of the film to improve the bonding force between the film and the nonwoven fabric, and the thickness of the adhesive layer, especially the upper adhesive layer, is set to 0.07 mm to 0.00 mm.
By setting the thickness within the range of 3+n, the amount of the tackifier blended in the upper adhesive layer that transfers to the rubber sheet is limited, preventing swelling and dimensional changes of the rubber sheet, and also preventing the upper adhesive layer from having a thickness within this range. If it is an adhesive layer, the adhesive force between the rubber sheet and the film will be stable, resulting in cohesive failure rather than interfacial failure. Of course, the presence of the film blocks the migration of the tackifier in the lower adhesive layer. Furthermore, due to the presence of the reinforcing material, even if cracks occur in the base, the waterproof sheet will only break the reinforcing material and maintain the followability of the base, and has appropriate rigidity, making it easy to install on the base. Make your work easier.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the waterproof sheet with adhesive layer of the present invention, Figure 2 is a sectional view of the waterproof sheet with an adhesive layer of the present invention;
The figure is a sectional view of a tarpaulin sheet showing another embodiment of the present invention, and FIG. 3 shows dimensional changes of the tarpaulin sheet of the present invention after oral administration.
FIG. 4 shows the relationship between elongation and tensile strength of a waterproof sheet and its constituent members. (ll... Waterproof sheet with adhesive layer (3a)... Upper adhesive layer, 3b)... Lower adhesive layer (
4)...Non-woven fabric, (5)...Thermoplastic resin film (6)...Supporting material Patent applicant: Minohoshi Belting Co., Ltd. (Figure 1, Figure 2, Figure 3) (T3) 4th rgJ 1 middle high” (oA)

Claims (1)

[Claims] 1. A waterproof sheet with an adhesive layer in which an adhesive layer is laminated on one side of a rubber sheet, in which a nonwoven fabric is completely buried in the adhesive layer with the adhesive permeated therein, and the nonwoven fabric is A waterproof sheet with an adhesive layer, comprising a thermoplastic resin film adhered to at least one surface and divided into an upper adhesive layer and a lower adhesive layer. 2. The thickness of the upper adhesive layer of the above waterproof sheet is 0.07 to 0.
．． A waterproof sheet with an adhesive layer according to claim 1, wherein the adhesive layer has a thickness in the range of 3 mm. 3. Area weight 10~70g/cm^2, tensile strength 0.5~1
0.01 to 0.1 on one side of nonwoven fabric with 5 kg/cm
A waterproof sheet with an adhesive layer according to claim 1, characterized in that it is formed by laminating mm-thick thermoplastic resin films.