JPS6096444A - Manufacture of grooved waterproof sheet - Google Patents

Abstract

PURPOSE:To obtain a waterproof sheet which is capable of preventing possible loss of a groove during the storage by a method wherein a peelable self-supporting thermoplastic film temporarily mounted on a pressure-sensitive adhesive layer is heated or the film is temporarily mounted thereon heating it and then, a groove is formed on the adhesive layer and the film with a carving roll. CONSTITUTION:A peelable self-supporting thermoplastic film 3 coated with a silicon based peeling agent, fluorine based peeling agent or the like on the surface thereof is stuck on an adhesive layer 2 of a waterproof sheet provided with a thick pressure-sensitive adhesive layer such as unvulcanized butyl rubber layer and acrylic copolymer layer on the surface of a high molecular sheet 1. Then, the assembly is heated upto the temperature equal to or below the softening temperaturae of the film 3 from the surface of the film 3 and fed between a carved roll forming a desired convex pattern and a support roll in such a manner to have the carved roll surface position on the surface of the film 3 to form a groove 4 with the pattern of the carved roll shaped on the adhesive layer 2 and the film 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a grooved waterproof sheet. Generally, when laying a waterproof sheet made of a polymer sheet on a base surface, an adhesive is applied to the sheet and the base surface, respectively. After drying, the adhesive surfaces are overlapped and pressed together to form a waterproof layer.

Furthermore, in order to easily carry out such waterproof construction, it is known that a pressure-sensitive adhesive layer is previously formed on the surface of the polymer sheet.

When carrying out waterproofing using these sheet-like waterproof materials, it is important to prevent air from being trapped between the waterproof sheet and the underlying surface, but the sheet must be approximately 1 meter wide. Due to these factors, the current situation is that air entrapment cannot be prevented.

Such air entrapment reduces the adhesion area between the waterproof sheet and the underlying surface, which not only causes poor adhesion, but also causes the disadvantage of inducing blistering and peeling after installation. Tarpaulin sheets have been proposed that have ventilation channels or grooves to diffuse air trapped between the tarpaulin sheet and the underlying surface. However, ventilation channels are generally formed by pasting a coarse cloth such as a net-like non-woven fabric or cheesecloth, but the primer coated on the underlying surface impregnates and impairs breathability, so it is difficult to diffuse sufficiently. Furthermore, if the waterproof sheet has grooves, the grooves may be crushed and partially lost during storage from the time of manufacture to the time of use, making it impossible to obtain a sufficient diffusion effect. Ta.

The loss of grooves was particularly common when the grooves were applied to the surface of the pressure-sensitive adhesive layer due to its fluidity.

The present invention provides a new method for manufacturing a waterproof sheet with grooves, which prevents the grooves from being lost during storage when the grooves are formed in the pressure-sensitive adhesive layer,
The gist of this is that a self-supporting peelable thermoplastic film is attached to the adhesive layer surface of a waterproof sheet made of a pressure-sensitive adhesive layer on the surface of a polymer sheet, and then heated. According to the manufacturing method of the present invention, the film is bonded to the surface of the adhesive layer while heating, and then an engraved roll is pressed against the surface of the film to form grooves of a desired shape in the adhesive layer and the film. For example, the desired shape of the groove formed in the pressure-sensitive adhesive layer is held by a self-supporting thermoplastic film shaped into the same shape, so it can be wound into a roll or a sheet and layered. The grooves formed in the pressure-sensitive adhesive layer will not be lost even if the adhesive is stored.

The manufacturing method of the present invention will be explained in detail. A polymer sheet made of a vulcanizate mainly composed of synthetic rubber such as ethylene-propylene-terpolymer rubber, butyl rubber, and chloroprene rubber.
Thickness 0.1~. 1゜2mm) surface, 0.1Fl1
A thick pressure sensitive adhesive layer of m or more, for example, an unvulcanized butyl rubber layer,
``The adhesive layer of the waterproof sheet provided with an acrylic copolymer layer, etc. has self-supporting properties with a thickness of 0.1 mm or more,
In addition, a releasable thermoplastic film, such as a polyolefin film, a polyvinyl chloride film, etc., which has been subjected to a release treatment such as a silicone release agent or a fluorine release agent, is bonded to the surface. Next, the film surface is heated mainly from the film surface at a temperature equal to or lower than the softening temperature of the film, and the film surface is positioned on the engraved roll surface between the engraved roll and the support roll on which the desired protruding pattern has been formed. The pattern of the engraved roll is imprinted on the adhesive layer and the film to form a groove.The thermoplastic film subjected to the peeling process is heated and softened before being bonded to the surface of the adhesive layer. Grooves may be formed in the adhesive layer and the film by bonding the film to the surface of the adhesive layer and then pressing it against an engraved roll. At this time, it is preferable to heat the waterproof sheet at the same time.

The drawing shows a cross section of a waterproof sheet obtained by the manufacturing method of the present invention, where 2 is an IFi polymer sheet, 2 is a pressure-sensitive adhesive layer, and 3 is a pressure-sensitive adhesive layer.
4 is a releasable thermoplastic film, 4 is a groove formed in layer 2, and 5 is a recess formed in film 3. The width of the sea area 4 varies depending on the thickness of the layer 2, etc., but the width is 0.1 to 5.
yrm, the depth is 0.05 to 3 mm, and the surface area of the groove recesses is preferably 70+% or less of the surface area on the forming side. According to the manufacturing method of the waterproof sheet of the present invention,
The self-supporting releasable thermoplastic film temporarily attached to the surface of the pressure-sensitive adhesive layer is heated, or the film is temporarily attached while being heated, and grooves are formed in the adhesive layer and the film using an engraved roll. Since the grooves are reliably formed in the adhesive layer and are held in the recesses formed by the film trap, they will not be lost during storage.

Examples of the present invention will be shown below. The text middle part means the weight part.

Example 1 A pressure-sensitive coating consisting of 100 parts of butyl rubber, 40 parts of adhesion-promoting resin, 50 parts of mineral filler, 30 parts of polybutene and 2 parts of carbon black was applied to one side of an ethylene-propylene-terpolymer rubber sheet having a thickness of 1 mm. adhesive substance o,
A waterproof sheet was prepared by coating it to a thickness of 2 mm to form a pressure-sensitive adhesive layer. On the other hand, a film was prepared in which a silicone release agent was coated on one side of a polyethylene film with a thickness of 0.15 mm, and the waterproof sheet was While heating the sheet and the film at 80°C, they were attached to the adhesive layer side of the sheet via the treated side of the film, and then a width of 1.5 cm was applied to the roll surface.
The film was inserted between an engraved roll on which a protrusion with a height of 0.5 mm was formed with a distance of 10 mm and a support roll, so that the film surface was on the same side as the engraving, and the adhesive layer and the width of the film were A grooved tarpaulin sheet having a large number of parallel grooves in the direction was obtained.

Example 2 A polyethylene foam (Q, 5 mm) with a foaming ratio of 10 times was laminated on one side of an ethylene-propylene-terpolymer rubber sheet with a thickness of 1, and on top of this a polyethylene foam (Q, 5 mm) with a thickness of Q, Q5
A waterproof sheet with a pressure-sensitive adhesive layer formed by coating an acrylic copolymer with a thickness of 1.0 mm was obtained.The sheet and the release-treated film used in Example 1 were laminated together while heating at 120°C, and the following was done. A grooved waterproof sheet in which grooves were formed up to the foam was obtained by the same operation as in Example 1.

The grooved waterproof sheets obtained in Examples 1 and 2 in this way)
Vi, It was rolled up into a roll and stored at 70℃ for 3 months, but no loss of grooves in the adhesive layer was observed. The waterproofing process was carried out by peeling and pasting the film and pressing it with a roll.As a result, the air trapped between the base surface and the waterproof sheet was diffused through the grooves, and the entire surface was evenly coated. I was able to glue it.

[Brief explanation of drawings]

The drawing is a partial enlarged sectional view of a grooved waterproof sheet manufactured by the manufacturing method of the present invention. Patent applicant Sanbe Hijikata, representative of Nitto Denki Korai Co., Ltd.

Claims (1)

[Claims] A self-supporting releasable thermoplastic film is attached to the adhesive layer surface of a waterproof sheet formed by providing a pressure-sensitive adhesive layer on the surface of a polymer sheet, or the adhesive layer is heated while the film is heated. 1. A method for producing a grooved waterproof sheet, which comprises laminating the layer surfaces and then pressing an engraved roll against the film surface to form grooves of a desired shape in the adhesive layer and the film.