JP2001239616A - Waterproof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof sheet with excellent water resistance, weatherability, heat resistance, wear resistance and stretchability and also with excellent tear resistance and penetration resistance. SOLUTION: In a waterproof sheet 1 wherein a silicone rubber is reinforced with a fiber, a reinforcing material 2 is impregnated with a resin layer 3 and a part where a part of the reinforcing material 2 is projected from the resin layer 3 is impregnated and coated with a silicone rubber layer 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to the use of silicone rubber in physical properties such as tensile strength and frictional strength, weather resistance,
The present invention relates to a waterproof sheet having excellent water resistance.

[0002]

2. Description of the Related Art As one of waterproofing materials provided on a roof of a building, there is a sheet waterproofing using an elastomeric sheet such as rubber. Compared with asphalt waterproofing and the like, it is one of the typical waterproofing methods now because of its advantages such as good workability of laying.

[0003] As such a waterproof sheet, there is a sheet made of only an elastomer. In particular, when the sheet is used for an application requiring reinforcement, the sheet is torn by a method such as embedding a woven or nonwoven fabric in the elastomer. Some have improved physical properties such as strength.

[0004] Usually, as a waterproof sheet,
Not only waterproof performance, but also water resistance, weather resistance, heat resistance,
Although wear resistance and stretchability are required, in recent years, it has been required to further improve those characteristics.

[0005] As a material having excellent properties as described above,
Silicone rubber can be mentioned, utility model registration 3
No. 032568 proposes a roofing material in which the surface of a reinforcing material made of fiber is coated with silicone rubber.

[0006]

However, the roofing material described in Japanese Utility Model Registration No. 3032568 has only a silicone rubber coating layer provided on one surface of a reinforcing material made of fiber. Although improvements in physical properties are observed, in terms of waterproofing, there is some concern about strength such as penetration resistance because the silicone rubber coating layer serving as a waterproofing layer is only a thin layer.

[0007] Further, when the entire reinforcing material is impregnated with silicone rubber, the strength can be improved, but the silicone rubber itself is a relatively expensive material, which causes a cost problem.

Further, it is conceivable that another inexpensive sheet is backed on the back surface of the silicone rubber to improve the tear resistance and penetration resistance of the waterproof layer, but the silicone rubber itself adheres to a different material. However, such a method is difficult to realize.

Accordingly, an object of the present invention is to provide a waterproof sheet which is excellent in water resistance, weather resistance, heat resistance, abrasion resistance, elasticity and the like, and also excellent in tear resistance and penetration resistance.

[0010]

Means for Solving the Problems To achieve the above object, a first aspect of the present invention is to provide a waterproof sheet in which silicone rubber is reinforced with fibers, wherein a reinforcing material made of fibers is impregnated with a resin layer, A part of the reinforcing material protrudes from the resin layer, and a silicone rubber layer is provided at a portion where the reinforcing material protrudes.

As described above, by impregnating the reinforcing material with the resin layer, the tear resistance and penetration resistance of the waterproof sheet can be improved, and the silicone rubber layer is coated on the portion where the reinforcing material protrudes. As a result, the waterproof sheet can have physical properties such as water resistance, weather resistance, heat resistance, abrasion resistance, and elasticity, and can be firmly integrated by the anchor effect of the reinforcing material. In addition, the provision of the resin layer eliminates the necessity of imparting strength to the silicone rubber layer, so that the thickness can be reduced, which is advantageous in terms of cost.

According to a second aspect of the present invention, the reinforcing material made of fiber is a woven, knitted or non-woven fabric of glass fiber or chemical fiber.

By using such a reinforcing material, it is possible to provide a waterproof sheet that can increase the strength and can be used for applications in which a load is applied.

[0014]

FIG. 1 is a sectional view of a waterproof sheet 1 of the present invention. FIG. 2 is a cross-sectional view of the reinforcing member 2 impregnated with only the resin layer 3.

The waterproof sheet 1 of the present invention comprises a reinforcing material 2 made of fiber, a resin layer 3 and a coating of a silicone rubber layer 4, and the reinforcing material 2 is impregnated with the resin layer 3 and has a silicone rubber layer. Has an impregnated coating.

As the reinforcing material 2, a woven fabric, a knitted fabric, or a nonwoven fabric made of inorganic fibers such as glass fibers or organic chemical fibers such as polyester fibers, polyamide fibers, acrylic fibers, and aramid fibers can be used.

The thickness is preferably from 1.0 to 5.0 mm. If the thickness is less than 1.0 mm, sufficient strength and physical properties cannot be imparted to the waterproof sheet 1, and if the thickness exceeds 5.0 mm, the waterproof sheet 1 is flexible. This is not preferable because the workability deteriorates and the workability deteriorates.

The resin layer 3 is not limited as long as it can impregnate the reinforcing material 2, but may be an acrylic resin,
Examples include an ethylene vinyl acetate resin, a urethane resin, a polyethylene resin, and a polypropylene resin. Further, a material having good adhesiveness to the material used for the reinforcing material 2 is preferably used.

A thickness of 0.5 to 4.0 mm is used. If the thickness is less than 0.5 mm, the tear resistance and penetration resistance are insufficient. It is not preferable because the flexibility is deteriorated or the entire layer of the reinforcing material is impregnated.

As the silicone rubber layer 4, a commercially available one-pack or two-pack silicone rubber can be used. Its thickness is in the range of 0.5 to 5.0 mm. If it is less than 0.5 mm, it will be easily damaged by a slight impact, and 5 mm
It is not preferable to exceed the value because the cost is pretended.

The production of the waterproof sheet 1 of the present invention is performed, for example, by
The resin is impregnated from one side of the reinforcing material 2 so that the resin layer 3 does not completely impregnate the reinforcing material 2 and a part of the reinforcing material 2 projects from the resin layer 3 as shown in FIG. Create a monolith.

Next, the surface from which the reinforcing material 2 protrudes is impregnated and coated with silicone rubber and cured by curing to form a silicone rubber layer 4.

The order of the above method is reversed, and the reinforcing material 2 is first impregnated with silicone rubber and cured to form a silicone rubber layer 4, and then the resin is impregnated from the back surface. The resin layer 3 may be formed.

As described above, the resin layer 3 also has the silicone rubber layer 4
Both are in a state of being impregnated with the reinforcing material 2, so that both are firmly integrated by the physical anchor effect.

In order to form a strong integral body by the physical anchor effect, the thickness d of the impregnated portion as shown in FIG. 3 needs to be 0.2 mm or more, and if it is less than that, it may be easily peeled off. Is not preferred.

[0026]

EXAMPLES Next, the effects of the present invention were confirmed by comparing the two examples with each other, with reference to examples in which the present invention was implemented and comparative examples.

(Example) In this example, a polyester non-woven fabric (thickness: 1.25 mm, basis weight: 300 g) was used as a reinforcing material.
/ Cm ² ), and the reinforcing material was impregnated with 0.9 mm of an acrylic resin as a resin layer. Therefore, the remaining 0.35 mm of the reinforcing material protrudes from the surface of the resin layer. Then, the side where the reinforcing material protrudes is impregnated and coated with a one-part silicone rubber (product number SE5070) manufactured by Dow Corning Toray Silicone Co., Ltd.
, And cured with silicone rubber only on the surface to a thickness of 0.6 mm.
A 5 mm silicone rubber layer was formed.

(Comparative Example) In a comparative example, a one-part silicone rubber (product number SE5070) manufactured by Dow Corning Toray Silicone Co., Ltd. was impregnated and coated with the same reinforcing material as in the example, and cured at 90 ° C. for 12 minutes. In the same manner as in the example, the surface only containing silicone rubber has a thickness of 0.1 mm.
A silicone rubber layer having a total thickness of 1.5 mm was formed, including those formed with a thickness of 8 mm. In the comparative example, the resin layer was not impregnated.

[0029] The penetration resistance of the waterproof sheets of the above Examples and Comparative Examples was compared. As a test method, a test machine as shown in FIG. 4 was used. The tester 11 has a pair of columns 13, 13 rising from both ends of the bottom plate 12, between which a rubber substrate 14 is disposed on the bottom plate 12, and the columns 13, 13 are provided.
Rod 15 with a weight that moves up and down with the guide as a guide
A sharp angle blade 17 is attached to the moving rod 15 downward via a holder 16.

The waterproof sheet of the embodiment is placed on the rubber substrate 14 so that the silicone rubber layer faces upward, and the moving rod is allowed to fall naturally from above. The height when the waterproof sheet penetrated was measured by changing the height of the moving rod.

The same test was conducted for the comparative example, and the penetration resistance of the waterproof sheets of the example and the comparative example was compared. Table 1 shows the results.

[0032]

[Table 1]

As can be seen from the results in Table 1, it can be seen that the embodiment having the resin layer has about four times the strength of the penetration resistance as compared with the comparative example having no resin layer.

[0034]

As described above, according to the first aspect of the present invention, in a waterproof sheet in which silicone rubber is reinforced with fibers, a reinforcing material made of fibers is impregnated with a resin layer, and a part of the reinforcing material is made of resin. The reinforcing member protrudes from the layer, and a silicone rubber layer is provided at a portion where the reinforcing material protrudes.

As described above, by impregnating the reinforcing material with the resin layer, the tear resistance and penetration resistance of the waterproof sheet can be improved, and the silicone rubber layer is coated on the portion where the reinforcing material protrudes. As a result, the waterproof sheet can have physical properties such as water resistance, weather resistance, heat resistance, abrasion resistance, and elasticity, and can be firmly integrated by the anchor effect of the reinforcing material. In addition, the provision of the resin layer eliminates the necessity of imparting strength to the silicone rubber layer, so that the thickness can be reduced, which is advantageous in terms of cost.

The second aspect of the present invention is characterized in that the reinforcing material made of fiber is a woven, knitted or non-woven fabric of glass fiber or chemical fiber.

By using such a reinforcing material, it is possible to provide a waterproof sheet that can increase the strength and can be used for applications in which a load is applied.

[Brief description of the drawings]

FIG. 1 is a sectional view of a waterproof sheet of the present invention.

FIG. 2 is a cross-sectional view showing a state where a resin layer is formed on a reinforcing member.

FIG. 3 is an enlarged cross-sectional view showing a state in which a reinforcing material is impregnated with a silicone rubber layer.

FIG. 4 is a front view of a penetration resistance tester.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproof sheet 2 Reinforcement material 3 Resin layer 4 Silicone rubber layer

Continued on the front page F term (reference) 4F100 AG00A AK01A AK04 AK07 AK25 AK41 AK51 AK52B AK68 AN02B BA02 DG01A DG12A DG13A DG15A DH00A EJ82A GB07 JB07 JK02 JK16

Claims (2)

[Claims] 1. A waterproof sheet in which a silicone rubber is reinforced with a fiber, wherein a reinforcing material made of a fiber is impregnated with a resin, a part of the reinforcing material protrudes from the resin, and a silicone rubber is provided on a portion where the reinforcing material protrudes. A waterproof sheet comprising a layer. 2. The waterproof sheet according to claim 1, wherein the reinforcing material made of fibers is a woven fabric, a knitted fabric, or a nonwoven fabric of glass fibers or chemical fibers.