JP3805491B2 - Composite sheet for waterproof base fabric with excellent dimensional stability - Google Patents

Description

【００２０】
表１からも明らかなように、実施例１から４で得られた積層シートは、比較例１、２のシートに比べて、１８０℃における３％引張応力の点で優れており、アスファルト加工も問題なく行え、該アスファルトシートを屋外に設置した後の寸法変化も極めて小さいものであった。
【００２１】
【発明の効果】
以上のように本発明の塗膜防水用基布は、不織布とガラス繊維不織布をラミネートすることで、アスファルト加工時の張力による歪みが生じ難く、アスファルトの滲み出しの無い高強力高モジュラスを有する積層シートとなる。
さらに、本発明の塗膜防水用基布は両面に繊維が均一に存在するシートであるため、アスファルトコーティングおよびウレタン塗布を行う際の作業性がよく、アスファルトおよびウレタンと塗布防水用基布の接着力も非常に高いものであった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet used as a waterproof fabric base fabric.
[0002]
[Prior art]
In recent years, nonwoven fabrics and glass sheets have been used as a waterproof fabric for urethane coatings, but the performance of outdoor waterproofing fabrics of double waterproof layers, such as rubber asphalt layers and urethane layers, especially for urethane layers No base fabric has been obtained that satisfies problems such as rubber asphalt seepage, shrinkage with time due to residual strain due to tension during rubber asphalt processing, and shrinkage due to solar heat after installation outdoors.
For example, in the case of using a nonwoven fabric made of a thermoplastic resin, there is a problem that shrinkage occurs due to heat due to sunlight and a defect occurs in the waterproof layer. In both cases of non-woven fabrics and glass sheets, the back side when applying a resin that forms a waterproof layer, especially when rubber asphalt is placed on the base side to perform two-layer waterproofing, the base side rubber asphalt is the upper layer. The urethane layer oozes out and causes discoloration.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to solve such problems, and to provide a waterproof coating base fabric that is excellent in dimensional stability against heat due to asphalt processing and sunlight, and that does not cause resin to come off. It is what.
[0004]
[Means for Solving the Problems]
The present invention is a composite sheet composed of a nonwoven fabric / glass fiber nonwoven fabric having an air permeability of 1.0 cc / cm / sec or less and a dry heat shrinkage of 0.5% or less when treated at 180 ° C. for 10 minutes. A composite sheet for a waterproof base fabric with excellent dimensional stability, characterized in that a 3% tensile stress at 180 ° C. is 2 kgf / 5 cm or more.
That is, the composite sheet of the present invention is characterized by having a non-woven fabric / glass fiber non-woven fabric structure, which is excellent in dimensional stability against heat and does not cause the resin to come off. Moreover, the followability with respect to the dimensional change of a foundation | substrate is hold | maintained by making one side into a nonwoven fabric, and waterproofness can be kept favorable.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
Various nonwoven fabrics can be used as the nonwoven fabric used in the present invention. The nonwoven fabric is made of synthetic fibers such as polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, and polyamides such as nylon 6 and nylon 66. Is preferred from the viewpoint of strength and rot resistance, and polyester is particularly preferred from the viewpoint of heat resistance.
[0006]
Nonwoven fabric production methods include long fiber nonwoven fabric production methods such as the spunbond method, melt blow method, flash spinning method, etc., and after making card web, heat treatment or treatment such as needle punch or water flow path is used to make the nonwoven fabric short. There are methods, such as a fiber nonwoven fabric manufacturing method, and it is not specifically limited. Moreover, you may provide resin, such as an acryl, polyamide, a polyurethane, phenol, urea, an epoxy, to a nonwoven fabric as needed.
[0007]
The glass fiber non-woven fabric used in the present invention is preferably as low as possible in physical properties at a temperature around 180 ° C. The 3% modulus value at 180 ° C. needs to adjust the basis weight of the glass fiber nonwoven fabric so as to match the tension of the asphalt processing machine, but generally needs to be 2 kgf / 5 cm or more. Further, in the glass fiber nonwoven fabric, it is preferable that the fibers are dispersed as uniformly as possible because the adhesiveness is improved during asphalt coating or urethane coating.
[0008]
Subsequently, the base fabric used as the structure of a nonwoven fabric / glass fiber nonwoven fabric is created using the said nonwoven fabric and a glass fiber nonwoven fabric. As a method for producing the above-mentioned laminated base fabric, a normal wet lamination, dry lamination, extrusion lamination, or the like may be used, but in order to prevent the rubber asphalt component from exuding, a film layer is formed by extrusion lamination. It is preferable. In the case of wet laminating and dry laminating, it is preferable to place a film between the non-woven fabric and the glass fiber non-woven fabric in order to prevent bleeding. For example, PET, nylon, or PVA can be used as such a film.
[0009]
The performance of the base fabric thus prepared is as follows: air permeability is 1.0 cc / cm ² / sec or less, dry heat shrinkage when treated at 180 ° C. for 10 minutes, 0.5% or less, 180 ° C. It is important that the 3% tensile stress is 2 kgf / 5 cm or more, and can be adjusted by the basis weight of the nonwoven fabric, the thickness and the basis weight of the glass fiber nonwoven fabric. If the air permeability is 1.0 cc / cm ² / sec or more, rubber asphalt oozes out easily, which is not preferable. Further, if the dry heat shrinkage is 0.5% or more, shrinkage due to sunlight heat is a problem, which is not preferable. Further, if the 3% tensile stress at 180 ° C. is 2 kgf / 5 cm or less, distortion due to the tension during rubber asphalt processing occurs, and this is not preferable because it promotes shrinkage due to sunlight heat after construction.
[0010]
As described above, the waterproof coating base fabric of the present invention has a high strength and high modulus in which rubber asphalt does not bleed out and is hardly distorted by tension during asphalt processing by laminating a nonwoven fabric and a glass fiber nonwoven fabric. It becomes a laminated sheet.
[0011]
【Example】
Hereinafter, the present invention will be described specifically by way of examples.
About the test method, it conformed to JIS L1906.
Tensile strength Using Tensilon manufactured by Orientic Co., Ltd. as a low-speed extension type tester, a sample piece having a width of 5 cm and a length of 20 cm was measured at a gripping interval of 10 cm and a tensile speed of 10 cm / min, and n = 10 pieces. Obtained from the average.
Stress at 3% elongation at 180 ° C. A heating device capable of heating the sample is attached to the Tensilon, and the sample is held by the chuck as described above and placed in the heating device and heated to 180 ° C. Then, 5 minutes after stabilization at 180 ° C. after the start of heating, measurement was performed in an atmosphere at 180 ° C. according to the tensile strength measurement, and the stress at 3% elongation was determined from the tensile elongation curve.
Heat shrinkage rate The composite sheet was placed on a metal net, heated in a thermostatic bath at 180C for 10 minutes, immediately after heating, taken out at room temperature, and allowed to stand for 30 minutes, and then the dimensional change was measured.
Air permeability Measured by the Frazier method.
[0012]
Example 1
Melting point: 260 ° C., intrinsic viscosity (measured at 20 ° C. using a mixed solvent such as phenol / ethane tetrachloride ethane) [η] = 0.68 polyethylene terephthalate using a spinneret having a pore diameter of 0.35 mm and a pore number of 160, and a melting temperature It was discharged from a spinneret at 285 ° C., sucked with an air soccer at a spinning speed of 4500 m / min, and the stretched fibers were collected on a wire net and used as a web. This web was press-contacted with a press-contact roll to obtain a nonwoven fabric. The basis weight of the obtained nonwoven fabric was 50 g / m ² .
Next, the non-woven fabric was laminated by extrusion extrusion lamination of polyethylene using a 40 g / m ² glass fiber non-woven fabric. At the time of lamination, the thickness of polyethylene was set to 40 μm.
Table 1 shows the physical properties of the obtained laminated sheet.
[0013]
Example 2
A laminated sheet was prepared in the same manner as in Example 1 except that the basis weight of the polyethylene terephthalate fiber nonwoven fabric was 40 g / m ^{2 under the} same conditions as in Example 1. The physical properties of the obtained laminated sheet are shown in Table 1.
[0014]
Example 3
A laminated sheet was prepared under the same conditions as in Example 1 except that dry lamination was performed using a polyester film having a thickness of 15 μm instead of polyethylene extrusion lamination. Table 1 shows the physical properties of the obtained laminated sheet.
[0015]
Example 4
A laminated sheet was prepared in the same manner as in Example 1 except that the basis weight of the nonwoven fabric was 80 g / m ² . Table 1 shows the physical properties of the obtained laminated sheet.
[0016]
Comparative example 1
Table 1 shows the physical properties of a polyethylene terephthalate fiber nonwoven fabric having a basis weight of 50 g / m ² .
[0017]
Comparative example 2
A laminated sheet was obtained in the same manner as in Example 1, except that the glass fiber nonwoven fabric was not used and two nonwoven fabrics of Comparative Example 1 were used. Table 1 shows the physical properties of the obtained laminated sheet.
[0018]
Using the composite sheets obtained in Examples 1 and 4 and Comparative Examples 1 and 2, rubber asphalt sheets were impregnated at a rubber asphalt temperature of 180 ° C. and a processing tension of 0.7 kg / cm. The dimensional stability of the obtained Alfalt sheet was evaluated, and the tensile strength (kg / 5 cm width) at 3% elongation at 180 ° C. and the heat shrinkage rate (%) after heat treatment at 180 ° C. for 10 minutes were as follows: The measurement was made with respect to the warp direction (hereinafter referred to as MD) and the weft direction (hereinafter referred to as CD direction) of the composite sheet.
The results are also shown in Table 1.
[0019]
[Table 1]

[0020]
As is clear from Table 1, the laminated sheets obtained in Examples 1 to 4 are superior to the sheets of Comparative Examples 1 and 2 in terms of 3% tensile stress at 180 ° C., and asphalt processing is also possible. It was possible to perform without problems, and the dimensional change after the asphalt sheet was installed outdoors was extremely small.
[0021]
【The invention's effect】
As described above, the waterproof coating base fabric of the present invention is a laminate having a high strength and a high modulus in which asphalt does not bleed out by laminating a nonwoven fabric and a glass fiber nonwoven fabric so that distortion due to tension during asphalt processing hardly occurs. It becomes a sheet.
Furthermore, since the waterproof fabric for coating film of the present invention is a sheet in which fibers are uniformly present on both sides, the workability when performing asphalt coating and urethane coating is good, and bonding of asphalt and urethane to the coated waterproofing fabric is good. The power was also very high.

Claims (1)

A composite sheet composed of a nonwoven fabric / glass fiber nonwoven fabric having an air permeability of 1.0 cc / cm / sec or less, a dry heat shrinkage of 0.5% or less when treated at 180 ° C. for 10 minutes, and a condition at 180 ° C. A composite sheet for waterproof base fabric with excellent dimensional stability, characterized by having a 3% tensile stress below 2 kgf / 5 cm or more.