JP2000145050A - Roof underlayment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roof under-layment in which holes or pinholes formed in base paper due to various kinds of reasons are surely covered to eliminate causes for water leakage, and the mechanical strength such as the tensile strength and the tear strength at low temperature is improved. SOLUTION: A paper impregnated with asphalt forms a core 2, an asphalt layer 3 is provided on one side (A side) of the core 2 through a non-woven fabric layer 6, a mineral powder layer 4 is provided on the surface of the asphalt layer 3, and a non-woven fabric layer 5 is provided on the other side (B side) of the core 2 through the asphalt layer 3. Even when holes or pinholes are present in the base paper forming the core, they can be effectively covered, and the mechanical strength such as the tensile strength and the tear strength at low temperature can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof for maintaining the waterproofness of a roof by interposing the roof material such as a tile, a slate or a metal when installing the roof material. It relates to underlaying materials.

[0002]

2. Description of the Related Art As a roofing material for a general house, asphalt felt obtained by impregnating paper with asphalt or pitch is used as a core material, and blown asphalt mixed with a filler is applied to both sides of the core material to prevent adhesion. For this reason, asphalt roofing in which mineral powder particles such as talc and quartz sand are spread over the entire surface has been widely used.

[0003] The asphalt roofing, which has excellent hydrophobicity and high decay resistance, exhibits high performance especially in water resistance and durability because blown asphalt itself has high tear strength. Due to the shortage, there were various problems such as lack of mechanical strength and low-temperature characteristics, such as breakage due to the wind at the time of construction and construction, and breakage during bending in winter.

Accordingly, recently, asphalt roofing has been developed in which a mineral powder layer is provided on one surface of the asphalt layer, and a nonwoven fabric layer is formed on the other surface in place of the mineral powder layer.

[0005] The asphalt roofing having the nonwoven fabric layer formed on the other surface exhibits high performance in mechanical strength such as tensile strength and tear strength because the nonwoven fabric reinforces the core material.

[0006]

However, in the case of the asphalt roofing, when the core material is made by impregnating paper with asphalt or the like, and the paper is made by using waste paper, During papermaking, resin particles such as vinyl chloride and polyethylene, and powder particles such as sand and earth may be squeezed. Therefore, when impregnating asphalt, the resin particles are melted out by the heat of the asphalt and small holes are formed. And pinholes are created by the removal of powder particles such as sand and soil, and these holes and pinholes can be formed by simply coating asphalt on paper.
00% was not blocked, causing water leakage.

Further, there is a problem that the asphalt roofing is not sufficient in terms of bending strength at low temperatures.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to reliably close holes and pinholes formed in a base paper for various reasons to wipe out the cause of water leakage and to prevent bending at low temperatures. It is an object of the present invention to provide a roof underlaying material which is intended to improve mechanical strength such as resistance and tear strength.

[0009]

In order to achieve the above-mentioned object, a roof underlaying material according to the present invention comprises a core material made of paper impregnated with asphalt, and an asphalt layer on one surface of the core material via a nonwoven fabric layer. Characterized in that a mineral powder layer is provided on the surface of the asphalt layer, and a nonwoven fabric layer is provided on the other surface of the core through an asphalt layer. Are effectively blocked even if they exist, and the mechanical strength such as folding resistance and tear strength at low temperature can be significantly improved.

[0010]

Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an enlarged sectional view showing a part of the underlaying material of the present application.

In the drawing, reference numeral 1 denotes an underlaying material of the present application, and 2 denotes a core material of the underling material 1 of the present application. The core material 2 is obtained by impregnating base paper with 100% straight asphalt. Of course, other asphalt or pitch may be impregnated.

An asphalt layer 3 is formed on both sides A and B of the core material 2, a mineral powder layer 4 is formed on the surface of the asphalt layer 3 on one side (upper side) A, and a mineral powder layer 4 on the other side (lower side) B. A nonwoven fabric layer 5 is formed on the surface of the asphalt layer 3.

The core material 2 and the asphalt layer 3 on the surface A
And a nonwoven fabric layer 6 is interposed between them. The nonwoven fabric layer 6
The base paper used for the core material 2 is a paper made by using waste paper, and the resin particles formed during the paper making are melted by heat to form pores, or powder such as sand that is formed. Even if the grains fall out and pinholes are formed, they can be effectively closed. That is, unlike the case where the asphalt is simply coated, the nonwoven fabric reliably carries the asphalt.

In the asphalt layer 5, the base asphalt may be straight asphalt or blown asphalt. The base asphalt may be mixed with rubber to form a modified asphalt, or a filler such as talc or slaked lime may be mixed if necessary.

When 1-15% of styrene-butadiene-styrene block copolymer (SBS) is used as the rubber to be mixed into the base asphalt, the brittleness at a low temperature and the sag at a high temperature are improved. The bending resistance at low temperatures and the mechanical strength at high temperatures can be greatly improved, and the sealing performance of nail holes can be greatly improved.

The reason why the SBS content is set to "1 to 15%" is that when the content is "less than 1%", the low-temperature bending resistance and the mechanical strength at high temperature are not improved. It does not improve the hole sealability. On the other hand, if "exceeding 15%", the cost becomes high and it cannot be put to practical use. However, it is needless to say that the content is not particularly limited in the present invention.

The nonwoven fabric used for the nonwoven fabric layer 5 formed on the surface of the asphalt layer 3 on the B side of the core material 2 is mainly for increasing the mechanical strength such as the tear strength of the core material 2. It is preferable to use a non-woven fabric having a basis weight of 30 to 80 g / m ² , and the non-woven fabric used for the non-woven fabric layer 6 interposed between the core material 2 and the asphalt layer 3 on the A side is naturally used. There is also a meaning to increase mechanical strength such as tear strength, but it is mainly for effectively closing the holes and pinholes when the base paper has holes, and has a basis weight of 10 to 50.
g / m ² thickness is satisfactory.

The material fibers of the nonwoven fabric layers 5 and 6 are preferably plastic fibers having relatively low elasticity, such as polypropylene and polyester. That is, the nonwoven fabric layers 5 and 6 made of plastic fibers having relatively small elasticity
Accordingly, the dimensional stability of the base paper (core material 2) sandwiched as shown in FIG. 1 is greatly improved.

The non-woven fabric used for the non-woven fabric layer 5 is preferably imparted with water repellency in order to improve the capillary phenomenon. For example, water repellency can be imparted by spraying a wax solution on the nonwoven fabric. Of course, water repellency may be imparted by another processing method.

The mineral powder layer 4 has silica sand, fine gil powder, and other mineral powder particles spread on the surface of the asphalt layer 3 on one surface (side A of the core material). This is for preventing the adhesion of the asphalt layer 3, and is also effective for preventing blocking during storage. The surface of the mineral powder layer 4 may be coated with a white paint 7 (indicated by a broken line in the figure) for the purpose of preventing the mineral powder from falling off and improving the commercial value.

[0021]

EXAMPLE 1 As shown in FIG. 1, asphalt-impregnated paper (base paper) was used as a core material 2 and one side of the core material (A side of the core material).
A rubber-containing asphalt layer 3 is provided via a non-woven fabric layer 6 made of a polyester non-woven fabric having a thickness of 20 g / m ² , and a mineral powder layer 4 made of silica sand is provided on the surface of the rubber-containing asphalt layer 3. A non-woven fabric layer 5 made of a 30 g / m ² thick polyester non-woven fabric is provided on the other surface (side B of the core material) via a rubber-containing asphalt layer 3 so as to have a total thickness of 1 m.
m underlaying material 1 of the present application (product of the present application) was obtained.

[0022]

Comparative Example 1 As shown in FIG. 2, a paper impregnated with asphalt was used as a core material 2 ', and rubber-containing asphalt layers 3', 3 'were formed on both surfaces (A surface and B surface) of the core material. On the surface of the asphalt layer 3 ′, a mineral powder layer 4 ′ made of silica sand
On the surface of the asphalt layer 3 'on the side B, 50 g / m
A comparative underlaying material 1 'having a total thickness of 1 mm (comparative product 1) by forming a non-woven fabric layer 5' made of a ^2- thick polyester non-woven fabric respectively
Prepare

[0023]

Comparative Example 2 As shown in FIG. 3, a paper impregnated with asphalt was used as a core material 2 ″, and a bron asphalt layer 3 ″ was formed on both surfaces (A surface and B surface) of the core material. A comparative underlaying material 1 "(comparative product 2 = commercially available 2) in which a mineral powder layer 4" made of silica sand is formed on the surface of each asphalt layer 3 "
2 kg asphalt roofing) was prepared.

The tensile strength (Kg / cm) according to JISA6022 using the above-mentioned product of the present invention and comparative products 1 and 2
And a tear strength (Kg) test, and in the same manner, using the product of the present invention and the comparative products 1 and 2 according to JISA
180deg on φ5mm mandrel according to 6022
(Degree) / 2 The core material was wound with the surface A side or the surface B side out at the speed of 2 seconds, and the limit temperature without cracks or cracks was measured. Was.

[Table 1] -------------------------------------------------------- Comparative product 1Comparative product 2------------------------------------------------------------------------------------------------- −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− ) [Width direction] 5.5 5.3 4.6------------------------------------Tear strength 2.0 2.6 0.6 (Kg) -------------------------------------------------------------- Limit of folding endurance [Outside of plane A] -15 -5 +10 Temperature (° C) [Outside of plane B] -15 -5 +10 -------------------------- -------------------------- −−−−−−−−−

As is clear from the above table, the product of the present invention has almost the same performance as the comparative product 1 in tensile strength and tear strength (because the total thickness of the nonwoven fabric is the same), but the folding endurance at low temperature. It was found that the properties were significantly improved. It was also found that Comparative Product 2 exhibited high performance in all aspects.

[0027]

As described above, the roof underlaying material according to the present invention has asphalt-impregnated paper as a core material, an asphalt layer provided on one side of the core material with a nonwoven fabric layer interposed therebetween, and a surface of the asphalt layer. Is provided with a mineral powder layer and a nonwoven fabric layer is provided on the other surface of the core material via an asphalt layer. Is firmly closed, and the core material is reinforced in a sandwich shape by two non-woven fabric layers, so it has good mechanical strength such as tensile strength and tear strength, and also has low bending resistance at low temperatures. Various effects such as remarkable improvement are exhibited.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a part of an underlaying material of the present application.

FIG. 2 is an enlarged sectional view showing a part of a comparative underlay material (comparative product 1).

FIG. 3 is an enlarged sectional view showing a part of a comparative underlay material (comparative product 2 = commercially available 22 kg asphalt roofing).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underlay material of this application 1 ', 1 "Comparative underwear material 2, 2', 2" Core material 3, 3 ', 3 "Asphalt layer 4, 4', 4" Mineral powder layer 5, 5 'Non-woven fabric layer 6 Non-woven fabric layer 7 White paint coating layer

Claims (1)

[Claims] An asphalt-impregnated paper is used as a core material, an asphalt layer is provided on one surface of the core material via a nonwoven fabric layer, a mineral powder layer is provided on the surface of the asphalt layer, and A roof underlaying material comprising a nonwoven fabric layer provided on the other surface via an asphalt layer.