JP4634787B2 - Tarpaulin - Google Patents

Description

  The present invention relates to a waterproof sheet used for waterproofing a roof or a roof of a building, for example.

Conventionally, a rubber sheet such as an ethylene-propylene rubber sheet has been used as this type of waterproof sheet. In order to adhere the rubber sheet to the floor surface, for example, a butyl rubber-based pressure-sensitive adhesive layer is provided on the back surface.
The rubber sheet is wound around a roll before use, and is transported and stored. However, if the rubber sheet is wound around the roll as it is, the pressure-sensitive adhesive layer on the back side of the outer rubber sheet sticks to the surface of the inner rubber sheet, making it difficult to pull out the rubber sheet from the roll. Although it has also been proposed to prevent the adhesive layer from sticking by interposing a release sheet between the rubber sheets, the release sheet is expensive, and disposal of the used release sheet becomes a problem. (For example, refer to Patent Documents 1 to 5).
In view of this, it is conceivable that a release agent such as a silicon release agent is applied to the surface of the rubber sheet so that the adhesive layer on the back surface of the rubber sheet does not stick to the surface of the lower rubber sheet.

JP 2001-347585 A JP 2001-150598 A JP 2003-3618 A Japanese Patent Laid-Open No. 10-296915 JP 7-317232 A

  However, when a release agent is applied to the surface of the rubber sheet, there is a risk that an operator who rides on the rubber sheet slides down when the rubber sheet is attached on an inclined roof.

As a means for solving the above-described conventional problems, the present invention provides a waterproof sheet 1 in which a nonwoven fabric 3 impregnated or coated with a release agent 6 is adhered to the surface of a rubber sheet 2 and an adhesive layer 7 is provided on the back surface. Or the non-woven fabric 3 which affixed the thermoplastic thin film 5 with which the release agent 6 was apply | coated to the rubber sheet 2 surface is affixed, and the waterproof sheet 1 which provided the adhesive layer 7 on the back surface is provided.
When the thermoplastic plastic thin film 5 that has been subjected to the release treatment is stuck on the surface of the nonwoven fabric 3, a large number of small protrusions 5 a may be formed on the surface of the plastic thin film 5 by hot embossing. The rubber sheet 2 is preferably ethylene-propylene rubber, and the nonwoven fabric 3 is heat-bondable by mixing low-melting fibers, or a high-melting component as a core and a low-melting component as a sheath. It is desirable that the core-sheath type composite fiber is made of or contains the core-sheath type composite fiber. Furthermore, it is preferable that the nonwoven fabric 3 is thermally bonded to the surface of the rubber sheet 2 by a hot melt sheet 4. The nonwoven fabric 3 is made of, for example, a low-melting fiber or heat-bondable by including a low-melting fiber, or a core-sheath type composite fiber having a high-melting component as a core and a low-melting component as a sheath, Alternatively, it is desirable that the rubber sheet 2 is thermally bonded to the surface of the rubber sheet 2 with a heat-adhesive nonwoven fabric 4 containing the core-sheath composite fiber.
Furthermore, it is desirable that the release agent 6 is a cross-linked silicone release agent or a thermal film forming type fluororesin.

[Action]
The nonwoven fabric 3 adhered to the surface of the rubber sheet 2 which is the main body of the waterproof sheet 1 reinforces the rubber sheet 2 and suppresses elongation deformation and the like. Since the thermoplastic thin film 5 is impregnated or coated, or the nonwoven fabric 3 is coated with the release agent 6, the outer waterproof sheet 1 is wound when the waterproof sheet 1 is wound around a roll. The adhesive layer 5 is in contact with the nonwoven fabric 3 of the inner sheet 1, but the release agent 6 impregnated or applied to the nonwoven fabric 3 or the thermoplastic thin film in which the release agent 6 is applied to the surface of the nonwoven fabric 3 5 prevents the adhesive layer 7 of the outer waterproof sheet 1 from sticking to the nonwoven fabric 3 of the inner waterproof sheet 1. The nonwoven fabric 3 has a cushioning property, and is difficult to slip even if an operator rides on the nonwoven fabric 3. In addition, when the thermoplastic thin film 5 subjected to the release treatment is stuck on the surface of the nonwoven fabric 3, a large number of small protrusions 5a are formed on the surface of the thermoplastic thin film 5 by hot embossing. Water impermeability is imparted, and the anti-slip action is greatly improved.
As the material of the rubber sheet 2, it is preferable to use durable ethylene-propylene rubber, and the nonwoven fabric 3 is made heat-bondable by mixing low-melting fibers or a high-melting-point component. The non-woven fabric 3 can be thermally bonded to the rubber sheet without an adhesive when it is made of a core-sheath type composite fiber having a core and a low melting point component as a sheath or containing the core-sheath type composite fiber. . From the viewpoint of production efficiency, the non-woven fabric 3 is preliminarily lined with a hot-melt sheet or a heat-adhesive non-woven fabric 4, and the non-woven fabric 3 is put on the rubber sheet via the hot-melt sheet or the heat-adhesive non-woven fabric 4. It is desirable to take a method of thermally bonding to the two surfaces. The heat-bondable nonwoven fabric 4 is made of a low melting point fiber or contains a low melting point fiber, or is made of a core / sheath type composite fiber or contains a core / sheath type composite fiber. By using the composite fiber, in addition to the thermal adhesiveness due to the low melting point component, the reinforcing effect due to the high melting point component can be expected.
When the release agent is a cross-linked silicone release agent or a thermal film forming type fluororesin, transfer of the release agent is prevented.

〔effect〕
Even if the waterproof sheet of the present invention is wound on a roll, the pressure-sensitive adhesive layer on the back surface does not stick, the sheet can be smoothly pulled out from the roll, and it is difficult to slip even if an operator gets on the waterproof sheet.

  The present invention will be described with reference to an embodiment shown in FIGS. 1 and 2. A waterproof sheet 1 is a rubber sheet 2, a nonwoven fabric 3 in which a hot melt sheet 4 is thermally bonded to the surface of the rubber sheet 2, and the rubber sheet. 2 and the pressure-sensitive adhesive layer 7 formed on the back surface.

  The rubber sheet 2 is, for example, acrylic rubber, butyl rubber, silicon rubber, urethane rubber, fluoride rubber, polysulfide rubber, graft rubber, butadiene rubber, isoprene rubber, chloroprene rubber, polyisobutylene rubber, polybutene rubber, isobutene-isoprene. Rubber, acrylate-butadiene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, pyridine-butadiene rubber, styrene-isoprene rubber, acrylonitrile-chloroprene rubber, styrene-chloroprene rubber, styrene-butadiene-styrene copolymer, styrene-isoprene- Styrenic thermoplastic elastomers such as styrene copolymer, styrene-hydrogenated polyolefin-styrene copolymer, butadiene-styrene block copolymer, styrene-rubber intermediate block Synthetic rubbers such as block copolymers such as styrene-styrene copolymers and rubbers such as natural rubber are used as materials, but in view of chemical resistance, weather resistance, durability, etc., ethylene-propylene rubber ( EPR, EPDM) are preferred. The thickness of the rubber sheet 2 is usually set in the range of 0.6 to 1.0 mm.

Examples of the nonwoven fabric 3 include polyester fibers, aliphatic or aromatic polyamide fibers, polyolefin fibers such as acrylic fibers, polyethylene fibers, and polypropylene fibers, vinylidene fibers, polyvinyl chloride fibers, polyurethane fibers, vinylon, rayon, cupra, and acetate fibers. A needle punched nonwoven fabric in which a web of synthetic fibers is entangled by needle punching, and those having a basis weight of 20 to 40 g / m ² are commonly used. As the synthetic fiber, it is desirable to use a polyester fiber from the viewpoint of durability and cost.

  Further, the nonwoven fabric 3 may be mixed with a low melting point fiber such as a low melting point polyamide fiber, a low melting point polyester fiber, or a polyethylene fiber so as to be heat-bondable. It may be constituted by a core-sheath type composite fiber having a component as a sheath, or may contain the core-sheath type composite fiber. Examples of the high melting point component include polyamide and polyester having a melting point of 200 ° C. or higher, and examples of the low melting point component include polyamide, polyester, and polyethylene having a melting point of 180 ° C. or lower. By using such a core-sheath type composite fiber, the nonwoven fabric 3 has good thermal adhesiveness and strength.

  It is preferable that a thermoplastic thin film 5 such as polyethylene, polypropylene, polyester, and polyamide is attached to the surface of the nonwoven fabric 3 for water shielding. It is desirable that a release agent 6 is applied on the surface of the plastic thin film 5 and that a large number of small protrusions 5a be formed by hot embossing. The small protrusion 5a has an anti-slip effect.

When the nonwoven fabric 3 does not have thermal adhesiveness, a hot melt sheet which is a low melting point plastic sheet such as a polyethylene sheet or a polyamide sheet, or a thermal adhesive nonwoven fabric 4 is lined on the back surface of the nonwoven fabric 3. ing.
The heat-bondable nonwoven fabric 4 is made of the same low-melting-point fiber or core-sheath type composite fiber as that of the nonwoven fabric 3, or contains the low-melting point fiber or core-sheath type composite fiber.

The nonwoven fabric 3 reinforces the rubber sheet 2 to suppress elongation deformation and the like. Instead of sticking the plastic thin film 5 to the surface, the nonwoven fabric 3 is impregnated or coated with a release agent. May be. As the release agent, a commonly used release agent such as polyethylene, silicon, paraffin, and higher fatty acid zirconium is used, and a cross-linking release agent having no transfer is desirable. Examples of the cross-linking mold release agent include a UV curable silicone mold release agent and a thermosetting silicone mold release agent. Moreover, even if it is a fluorine resin which does not carry out a crosslinking process, the heat film formation type fluorine resin which heats and forms a film | membrane is a desirable mold release agent. Moreover, it is desirable to suppress slipperiness by adding a filler such as talc, calcium carbonate, bentonite, fine silica powder and the like. Impregnation of the release agent is a 1 to 10 g / m ² approximately, as an active ingredient for normal basis weight 20 to 40 g / m ² nonwoven fabric.

  The non-woven fabric 3 is wound around a roll, the non-woven fabric 3 is pulled out from the roll, the hot-melt sheet on the back surface or the heat-adhesive non-woven fabric 4 is heated and softened, and is pressed onto the surface of the rubber sheet 2.

Examples of the pressure-sensitive adhesive layer 7 include rubber-based pressure-sensitive adhesives such as butyl rubber, styrene-butadiene rubber, and natural rubber, styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-hydrogenated polyolefin-styrene copolymer. Styrenic thermoplastic elastomer adhesives such as polymers, acrylic adhesives, and the like are used. The pressure-sensitive adhesive is usually provided as an organic solvent solution or an aqueous emulsion, and the coating amount is usually 80 to 200 g / m ² (solid content).

  The waterproof sheet 1 is wound around a roll to be transported and stored. At that time, as shown in FIG. 2, the adhesive layer 7 of the outer waterproof sheet 1 contacts the nonwoven fabric 3 of the inner waterproof sheet 1. Since the nonwoven fabric 3 is impregnated with the release agent 6, the adhesive layer 7 does not adhere to the nonwoven fabric 3. Further, when the release agent 6 is a crosslinked type, the release agent 7 does not transfer to the pressure-sensitive adhesive layer 5.

  Thus, the waterproof sheet 1 is pulled out from the roll without being interfered with the adhesive layer 7 and stuck on the substrate of the roof of the house or the foundation on the building roof. In that case, even if an operator gets on the waterproof sheet 1, the operator does not slide his / her foot due to the cushioning property of the nonwoven fabric 3 on the surface of the waterproof sheet 1.

  FIG. 3 shows another embodiment. In the waterproof sheet 11 of the present embodiment, the nonwoven fabric 3 itself has thermal adhesiveness and is impregnated with a release agent, so that it is directly attached to the rubber sheet 2 without using the hot melt sheet or the thermal adhesive nonwoven fabric 4. There is no need to attach the thermoplastic thin film 5.

〔Example〕
A waterproof sheet test sample and a comparative sample shown in Table 1 were prepared.

The following tests were conducted on the test sample and the comparative sample.
[Adhesion test]
Two sheets are overlapped so that the back surface of the upper sheet is in contact with the surface of the lower sheet, left to stand for 24 hours under a load of 10 kg / m ² , and then peeled off.
The case where the adhesive layer of the upper sheet can be smoothly peeled without transferring to the lower sheet is defined as OK.

[Slipperiness]
A sheet was placed on a wooden board, an underground tabi was placed on the sheet, a load of 20 kg was applied on the underground tabi, the wooden board was tilted, and an angle θ at which the underground tabi began to slide was examined. .
The case where it does not slip is OK, and the case where it starts to slide is NG.

[Leakage]
Place a sheet on a wooden board, hit a nail from the sheet, place a cylinder with a diameter of 150 mm and a height of 300 mm around the nail, seal it so that no water leaks from the surroundings, and supply water to a height of 250 mm. Put in. Leave for 24 hours and observe the change in water level. When the water level does not change at all, it is OK.

The test results are shown in Table 2.

  Even if the waterproof sheet of the present invention is wound on a roll, the adhesive layer on the back surface does not stick, and no release paper is used, so there is no dust, the sheet can be pulled out of the roll smoothly, and work on the waterproof sheet Since it is difficult to slip even if a person gets on, the work of sticking the waterproof sheet on the roof or the roof of the building becomes easy and safe.

1 and 2 show an embodiment of the present invention.
Side sectional view Partial cross-sectional side view explaining the state wound on a roll Side sectional view of another embodiment

Explanation of symbols

1,11 Waterproof sheet 2 Rubber sheet 3 Non-woven fabric 4 Thermal adhesive non-woven fabric (hot melt sheet)
5 Thermoplastic thin film 5a Small protrusion 6 Release agent (layer)
7 Adhesive layer

Claims (11)

  A waterproof sheet characterized in that a non-woven fabric impregnated or coated with a release agent is adhered to the surface of a rubber sheet, and an adhesive layer is provided on the back surface.   A waterproof sheet comprising a non-woven fabric having a thermoplastic plastic thin film coated with a release agent applied to a rubber sheet surface, and a pressure-sensitive adhesive layer provided on the back surface.   The waterproof sheet according to claim 2, wherein a number of protrusions are formed on the surface of the thermoplastic thin film by hot embossing. The rubber sheet is ethylene - waterproof sheet according to claim 1 is propylene rubber. The waterproof sheet according to any one of claims 1 to 4 , wherein the nonwoven fabric is heat-bondable by mixing low-melting fibers. The said nonwoven fabric consists of a core-sheath-type composite fiber which makes a high melting-point component a core and a low-melting-point component a sheath, or contains this core-sheath type composite fiber of any one of Claims 1-4. Tarpaulin. The waterproof sheet according to any one of claims 1 to 6 , wherein the nonwoven fabric is thermally bonded to a rubber sheet surface by a hot melt sheet. The waterproof sheet according to any one of claims 1 to 6 , wherein the nonwoven fabric is made of a low-melting fiber or is heat-bonded to the rubber sheet surface by a non-woven fabric that can be thermally bonded by including the low-melting fiber. .   The waterproof sheet according to claim 7, wherein the nonwoven fabric is composed of a core-sheath type composite fiber having a high melting point component as a core and a low melting point component as a sheath, or containing the core-sheath type composite fiber. The waterproof sheet according to any one of claims 1 to 9 , wherein the release agent is a cross-linked silicone release agent. The waterproof sheet according to any one of claims 1 to 9 , wherein the release agent is a heat film forming type fluororesin.

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