JPS5943591B2 - Waterproof sheet for roof base - Google Patents

Description

[Detailed description of the invention] The present invention relates to a waterproof sheet for roof substrates.

Asphalt loop ink, which is paper impregnated with asphalt, or polymeric loop ink made of polyethylene, polyvinyl chloride, synthetic rubber, etc., has traditionally been used as a waterproof sheet interposed between roofing materials and roofing boards.
Also, a combination of a polymeric loop ink and a sealant is used. When fixing these conventional waterproof sheets to roofing materials such as tiles or slate boards and roofing boards with nails, Asphalt Loop Ink can In warm regions, water leakage from the nail holes of general-purpose nails is unlikely to occur, but water leakage from the nail holes of screw nails often occurs, and when applied in cold regions, snowmelt water on the roof surface can reach water at the eaves when it snows. Seedlings that are dammed up have the disadvantage that water leaks through the holes of general-purpose nails and screw nails.

In addition, in the case of polymeric loop ink, the nail hole sealing effect immediately after installation is excellent, but if it is used for a long time, the temperature rises in the summer and the waterproof sheet shrinks, causing the tension between nail holes to increase. This phenomenon causes the nail hole to expand, resulting in water leakage from the nail hole.

Furthermore, with polymeric loop inks combined with sealants, the adhesive protective curing paper used to prevent sheets from adhering to each other is on the entire surface of one side, which significantly impairs workability and makes it difficult for workers to protect themselves from adhesive. There is a risk of slipping when working on paper. The present invention eliminates the drawbacks of the conventional waterproof sheet, and includes impregnating a nonwoven fabric made of polyester fiber with rubberized asphalt having a softening point of 90°C or higher, and providing the same rubberized asphalt layer on both sides.
Furthermore, after anti-adhesion treatment with silica sand, a width of 1.
50m77! The following is a waterproof sheet for a roof base having a thickness of 0.8 mm or more, which is provided with a butyl rubber adhesive layer having a thickness of 0.2 mm to 2.0 mm, and is further cured with a curing film having releasable properties.

The waterproof sheet for roof substrates of the present invention has good watertightness in general-purpose nail holes and screw holes by using rubberized asphalt with a softening point of 90°C or higher, and has a nonwoven fabric made of polyester fiber as a core material. Therefore, since the expansion and contraction of the sheet is extremely small, the watertightness of the general-purpose nail hole portion and the screw nail hole portion can be ensured.

Also, a width of 150 mTn or less and a thickness of 0.2 mm to 2 mm at a position within 150 mm from the side edge in the longitudinal direction of the sheet.

By providing a 0mm butyl rubber adhesive layer in the form of a band,
This has the effect of ensuring sufficient watertightness of the wrap portion in the longitudinal direction.

The rubberized asphalt with a softening point of 90°C or higher used in the present invention mainly refers to natural asphalt, petroleum-based asphalt such as straight asphalt, semi-prone asphalt, and prone asphalt, synthetic rubbers such as natural rubber, polyisoprene rubber, butyl rubber, etc. recycled rubber or rubber latex, etc., and thermoplastic resins such as polyethylene resins and vinyl acetate copolymer resins, and if necessary, synthetic resins such as natural resins such as rosin, aliphatic hydrocarbon resins, aromatic petroleum resins, etc. Also, the softening point obtained by adding aggregate such as carbon black, clay, silica, calcium carbonate, etc. is 90°C or higher.

The curing film having release properties includes curing paper, curing polyethylene film, etc. used for curing adhesives.

The nonwoven fabric made of polyester fibers preferably has a composition of 100% polyester.

The silica sand used for anti-adhesion treatment is preferably No. 7 to No. 9 silica sand.

A butyl rubber-based adhesive layer is a composition having a high adhesive property based on butyl rubber.
This product is made by kneading resin, additives, plasticizers, etc. using a strong double-arm type kneader, etc., and molding it using an extruder, etc., and has excellent adhesive strength at low temperatures. The waterproof sheet for roof bases of the present invention is made by impregnating a nonwoven fabric made of polyester fiber with rubberized asphalt at a temperature of 90°C or higher,
After providing a rubberized asphalt layer on both sides and performing adhesion prevention treatment with silica sand, a width of 150 mTn is placed within 150 mm from one or both edges in the longitudinal direction of the sheet.
Hereafter, a butyl rubber adhesive layer with a thickness of 0.2 mm to 2.0 mu is extruded in one or two lines using an extruder, and after curing the adhesive layer with a curing film having release properties, it is placed on a pressure roller. It can be rolled up and manufactured by applying sufficient pressure. The present invention will be explained in detail below with reference to Examples and Comparative Examples.

Example 1 The following components were used as raw materials and each component was kneaded in a Banbury mixer at 120° C. for 20 minutes under cross-wire conditions to produce rubberized asphalt.

The rubberized asphalt produced as described above was melted at 150°C and impregnated into a nonwoven fabric made of polyester fibers, and approximately 300μ of the rubberized asphalt was applied to both sides of the nonwoven fabric to create a sheet with a thickness of approximately 17 nm. Anti-adhesion treatment was performed using silica sand (trade name No. 8 silica sand manufactured by Tokai Kogyo Co., Ltd.).

A test piece was taken from this sheet and tested. The measurement results are also listed in Table 1. Example 2 A sheet was prepared in the same manner as in Example 1 using the following ingredients as raw materials.

A test piece was taken from this sheet and tested in the same manner. The measurement results are also listed in Table 1. Comparative Example 1 A sheet was prepared in the same manner as in Example 1 using the following ingredients as raw materials.

A test piece was taken from this sheet and tested in the same manner. The measurement results are also listed in Table 1. Example 3 A lap watertightness test was conducted on the sample sheet in which a butyl rubber adhesive layer of 150T1Lm in width and 1mm in thickness was provided along the edge of one side of the sheet in the longitudinal direction of Example 1, and the results were as follows. It is shown in Table 2.

Example 4 Results obtained by carrying out a lap watertightness test on the test sheet prepared in Example 1, in which a butyl rubber adhesive layer of 150 mm in width and 0.2 mm in thickness was provided along the edge of one side of the sheet in the longitudinal direction. are shown in Table 2.

Comparative Example 2 Results obtained by conducting a lap watertightness test on a test sheet in which a butyl rubber adhesive layer with a width of 150 mns and a thickness of 0.1 mm was provided along one edge of the sheet in the longitudinal direction of Example 1. are shown in Table 2.

Table 1 shows the physical properties of Examples 1 and 2 and Comparative Example 1.
The test method in Table 1 is as follows.

(I) Softening point of rubberized asphalt Conforms to JIS-K-2207.

(2) Tensile performance According to JIS-A-6022 (3) Waterproofness 3-1 General purpose nail hole water tightness test As shown in Figure 1, 450mm x 450m 7n x 11
Mm plywood 4 with roof base waterproof sheet 3, 300
Diameter 3mm x length 35mw at four corners of mm x 300mm square
After nailing with L nails 5, a cylinder 1 with an inner diameter of 50n and a height of 250n is erected in the nailed part, and the space between the roof base waterproof sheet and the cylinder is sealed with caulking material 2.

This cylinder was filled with water, and after 168 hours had elapsed, the height of the water column and the condition around the nails were observed to check for water leakage. 3-2 Watertightness test for screw holes As shown in Figure 2, waterproof sheet 3 for roof base is placed on a plywood board 4 measuring 450 mm x 450 mm x 11 inches, 300 mm deep.
4m in diameter at the four corners of a x300mm square? After nailing with a screw 6 of n x length 29mm, attach a screw with an inner diameter of 50mm to the nailing part.
A cylinder 1 with a height of 250 m is erected, and the space between the waterproof sheet for the roof base and the cylinder is sealed with caulking material 2.

This cylinder is filled with water, and after 168 hours have elapsed, the height of the water column and the condition around the screws are observed to check for water leakage. 3-3 Heat cycle test Test method Conditions in which a test specimen prepared in the same manner as in 3-1 is left standing in a -20°C atmosphere for 12 hours, and then left standing in an 80°C atmosphere for 12 hours as one cycle. To. Exposure for 7 cycles.

After 7 cycles, the height of the water column and the condition around the nails of the test specimen are observed to check for water leakage. (4
)100 in a weather-resistant sash yarn type weather-o-meter
The treatment was carried out for 0 hours.

The sash yarn type weatherometer is a carbon arc type and uses a filter with a transmittance of 91% or more for 360 nm light.The internal temperature is 45℃±2℃, the black panel temperature is 65℃, and the fountain cycle is 120 minutes to prevent precipitation. The drying time was 12 minutes and the drying time was 108 minutes. (5) Fraas embrittlement point according to JIS-K-2207 (6) Falling ball impact test The results of the lap watertightness test of Examples 3 to 4 and Comparative Example 2 are shown in Table 2.

Next, Table 3 shows the physical performance of the 22 kg asphalt loop ink and the general-purpose rubber loop ink.

Next, the selection of the core material to be interposed in the rubberized asphalt will be explained using Examples and Comparative Examples. Example 5 The rubberized asphalt of Example 1 was melted at 150°C and impregnated into a nonwoven fabric made of polyester fiber (product name: Unitika Spunbond 20707WTA, manufactured by Unitika Co., Ltd.), and about 300 μm of the rubberized asphalt was applied to both sides of the nonwoven fabric (product name Unitika Spunbond 20707WTA, manufactured by Unitika Co., Ltd.). Create a sheet approximately 1 mm thick by coating it one by one, and coat both sides with silica sand (
Anti-adhesion treatment was performed using Tokai Kogyo Co., Ltd. (product name: No. 8 silica sand).

A test piece was taken from this sheet and tested. The results are also listed in Table 4. Comparative Example 3 From a sheet obtained in the same manner as in Example 5, the rubberized asphalt of Example 1 was melted at 150°C and impregnated into Vinylon cheesecloth (trade name: Unitika Vinylon cheesecloth #510, manufactured by Unitika Co., Ltd.). A test piece was taken and tested.

The results are also listed in Table 4. Comparative Example 4 The rubberized asphalt of Example 1 was melted at 150°C and impregnated into glass cheesecloth (trade name: Glass cheesecloth WL.7OlOO, manufactured by Nitto Boseki Co., Ltd.) in the same manner as in Example 5.
A test piece was taken from the obtained sheet and tested.

The results are also listed in Table 4. Above Example 5, Comparative Example 3~
Table 4 shows the performance of No. 4. Example 6 The rubberized asphalt of Example 1 was melted at 150°C and impregnated into a nonwoven fabric made of polyester fibers, and the rubberized asphalt was applied to both sides of the nonwoven fabric to form a 0.8U7? ! A thick sheet was made and then treated with silica sand to prevent adhesion.

A test piece was taken from this sheet and tested. The results are also listed in Table 5. Comparative Example 5 The rubberized asphalt of Example 1 was melted at 150°C and impregnated into a nonwoven fabric made of polyester fibers, and the rubberized asphalt was coated on both sides of the fabric to create a sheet with a thickness of 0.7 m7fL. Anti-fouling treatment was applied.

A test piece was taken from this sheet and tested. The results are also listed in Table 5. Table 5 shows the performance of Example 6 and Comparative Example 5.

As shown in the results in Table 1, sheets made of rubberized asphalt with a softening point of 90° C. or higher have good watertightness in nail holes when driving general-purpose nails and screw holes when driving screw nails. In addition, it is flexible at low temperatures and has high sheet strength, making it easy to handle during work. However, the softening point is 90℃
A sheet made of rubberized asphalt of less than 10% had good watertightness in the nail holes when driving general-purpose nails, but water leakage occurred in the screw holes when driving screw nails.

In addition, there are other problems such as the sheet being hard and susceptible to impact at low temperatures, cold flow problems occurring in the summer, and the surface becoming sticky, resulting in very poor workability. As shown in the results in Table 2, when a butyl rubber adhesive layer with a width of 150 mm and a thickness of approximately 0.2 m is provided along the edge of the side edge in the longitudinal direction of the sheet, the watertightness of the lap portion is Good, but
When the thickness was less than 0.2 mm, water leaked from the lap portion.

If the butyl rubber adhesive layer is 2 mm or more, a step will occur at the lap portion. Especially in the 3-piece wrap section,
The difference in level is large, causing problems such as tiles and slate boards floating up and cracking. In addition, the width of the butyl rubber adhesive layer is 150m77 along the longitudinal side edges of the sheet! This can also be used as a marking line when wrapping with a width of 150.

Even if the width of the butyl rubber adhesive layer is 150 mu or less, watertightness can be ensured as long as it has a thickness of 0.2 mu or more.
It is economically unfavorable if the width of the butyl rubber adhesive layer is 150 mm or more. As shown in the results of Table 3, 2
2kg asphalt loop ink has low sheet strength, so it easily tears during construction, and there are problems with the watertightness of nail holes when driving general-purpose nails and screw holes when driving screw nails in cold regions.

In addition, with general-purpose synthetic rubber loop ink, the watertightness of nail holes when driving general-purpose nails is good, but as shown in heat cycle tests, the watertightness deteriorates over time and when driving screw nails. There is a problem with the watertightness of the screw holes. As shown in the results in Table 4, using a nonwoven fabric made of polyester as a base material has the advantage that the dimensional change of the sheet during heating is small and wrinkles do not occur.

As shown in the results in Table 5, the sheet thickness is 0.8mm.
In the above case, the watertightness of the nail hole when driving a general-purpose nail and the screw hole when driving a screw nail can be ensured, but if the sheet thickness is less than 0.8 mm, the water tightness of the nail hole when driving a screw nail is A water leak occurred.

As is clear from the above, the present invention impregnates a nonwoven fabric made of polyester fiber with rubberized asphalt having a softening point of 90°C or higher, provides the same rubberized asphalt layer on both sides, and further performs anti-adhesion treatment with silica sand. 150m77 from one or both edges of the seat in the longitudinal direction! Width 150mm or less, thickness 0.2mm to 2.0mm
It is possible to obtain a waterproof sheet for a roof base for use in cold regions having a thickness of 0.8 mm or more, which is provided with a butyl rubber-based adhesive layer of mu and is further cured with a curing film having mold releasability. This waterproof sheet for roof substrates is not only waterproof for general-purpose nail holes and screw holes in construction methods that require nailing or screwing, such as tiles or straight plates in cold regions, but also has watertightness at the lap part. In addition, by providing a butyl rubber adhesive layer on both sides of the sheet, one adhesive layer adheres to the base material such as roofing boards, so the sheet does not slide off, and it is possible to insert the sheet from any direction. Even with the construction, a butyl rubber adhesive layer can be provided on the lap part, and the width of the curing film used is as small as 150 mm, which significantly improves workability on site and increases worker safety. It has a particularly great feature.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the general-purpose nail hole water tightness test, Figure 2 is an explanatory diagram of the screw nail hole water tightness test, Figure 3 is an explanatory diagram of the water tightness test of the 2-piece lap part, and Figure 4 is an explanatory diagram of the 3-piece lap part water tightness test. FIG. 5 is a schematic cross-sectional view of a waterproof sheet for a roof base according to an embodiment of the present invention, and FIG. 6 is a schematic cross-sectional diagram of another embodiment of the present invention. 1...Cylinder, 2...Caulking material, 3
・・・・・・Roof base waterproof sheet, 4・・・・・・1
1m board, 5... General purpose nail, 6... Screw nail, 7... Butyl rubber adhesive layer, 8...
・Butyl rubber adhesive tape laminated with non-woven fabric made of polyester, 9... cylinder, 10... rubberized asphalt layer, 11... silica sand, 12...
...Nonwoven fabric layer, 13...Curing film layer having mold releasability.

Claims (1)

[Scope of Claims] 1. A nonwoven fabric made of polyester fibers is impregnated with rubberized asphalt having a softening point of 90°C or higher, and the same rubberized asphalt layer is provided on both sides of the nonwoven fabric, and an anti-adhesive treatment is performed with silica sand. A waterproof sheet for roofing substrates, characterized in that a strip-shaped butyl rubber adhesive layer having a desired width and thickness is provided on the side edges in the longitudinal direction of the sheet, and the sheet is further cured with a curing film having releasable properties. . 2. The waterproof sheet for a roof base according to claim 1, wherein the band-shaped butyl rubber adhesive layer is formed to have a width of 150 mm or less and a thickness of 0.2 mm to 2.0 mm. 3. Claims 1 or 2, characterized in that the thickness of the roof base waterproof sheet is 0.8 mm or more.
Waterproof sheet for roof base as described in any of the above.