JP2020070622A - Glass fiber reinforcement laminated nonwoven fabric for asphalt water proof base fabric - Google Patents

Abstract

To provide glass fiber reinforcement laminated nonwoven fabric for asphalt water proof base fabric capable of composing asphalt water proof base fabric allowing flexibility to the asphalt water proof base fabric to which an asphalt process has been carried out.SOLUTION: Glass fiber reinforcement laminated nonwoven fabric is configured to impregnate resin in laminated nonwoven fabric which is produced through generally parallely having a plurality of glass fibers between two layers of nonwoven fabric in a longitudinal direction of the nonwoven fabric, wherein its thickness is from 0.4 mm or more to 0.6 mm or less, its basis weight/thickness is from 0.25 g/cmor more to 0.35 g/cmor less, and a stress at 2% elongation in a longitudinal direction under a high temperature is 80 N/5 cm or more.SELECTED DRAWING: None

Description

  The present invention relates to a glass fiber reinforced laminated non-woven fabric used for an asphalt waterproofing base fabric.

In recent years, the mainstream construction of asphalt waterproofing base fabric has changed from a thermal construction method or a torch construction method for new construction to a self-adhesion construction method for repair work with a short construction period.
As a base fabric used for asphalt waterproofing, in order to obtain high strength, high elastic modulus and dimensional stability, glass fibers etc. are sandwiched in one direction between two layers of non-woven fabric or a net made of glass fibers etc. is sandwiched. A laminated sheet has been studied (for example, see Patent Document 1). However, the problem is to improve workability due to shrinkage during asphalt processing, and the flexibility of the asphalt waterproofing base fabric after asphalt processing, which is a required characteristic peculiar to the self-adhesion method, has not been studied.

JP, 8-246358, A

  The present invention has an object to provide a glass fiber reinforced laminated non-woven fabric for an asphalt waterproofing base cloth, which is capable of giving flexibility to the asphalt waterproofing base cloth after the asphalt processing. ..

  As a result of intensive studies, the present inventors have found that the above problems can be solved by the means described below, and have completed the present invention. That is, the present invention is as follows.

1. A glass fiber reinforced laminated non-woven fabric obtained by impregnating a resin into a laminated non-woven fabric in which a plurality of glass fibers are present between two layers of non-woven fabric substantially parallel to the longitudinal direction of the non-woven fabric, and having a thickness of 0.4 mm or more and 0.6 mm. Glass having a basis weight / thickness of 0.25 g / cm ³ or more and 0.35 g / cm ³ or less, and a stress of 80% N / cm or more at 2% elongation when heated in the longitudinal direction is 80 N / 5 cm or more Fiber reinforced laminated non-woven fabric.
2. The glass fiber-reinforced laminated nonwoven fabric for an asphalt waterproofing base fabric according to 1 above, having a basis weight of 100 g / m ² or more and 200 g / m ² or less.
3. The glass fiber reinforced laminated non-woven fabric for an asphalt waterproofing base fabric according to 1 or 2, wherein the non-woven fabric is a long fiber non-woven fabric.
4. 4. The glass fiber reinforced laminated non-woven fabric for an asphalt waterproofing base fabric according to 3 above, wherein the long fiber non-woven fabric is a polyethylene terephthalate spunbonded non-woven fabric.

  The asphalt waterproofing base fabric using the glass fiber reinforced laminated nonwoven fabric for asphalt waterproofing base fabric of the present invention is a flexible asphalt waterproofing base fabric after asphalt processing, so that the base fabric is flexible when used in a self-adhesion method etc. Therefore, it is possible to obtain an asphalt waterproofing base cloth having an effect that the workability is extremely excellent.

  The present inventors, as a result of intensive studies to improve the flexibility of the asphalt waterproofing base fabric after asphalt processing, if it is a glass fiber reinforced laminated nonwoven for asphalt waterproofing base fabric with the same basis weight, by reducing the thickness thereof. , Found that the flexibility is improved.

  However, in order to reduce the thickness of the glass fiber reinforced laminated non-woven fabric with the same basis weight, when processing is performed by raising the heating temperature or the pressure to be applied during thermocompression bonding, the glass fibers in the laminated non-woven fabric may be There is a problem that the product is crushed and broken by the hot pressing process. As a result, there is a possibility that the strength of the obtained glass fiber reinforced laminated nonwoven fabric may not reach the required quality. Therefore, the present inventors have studied the thickness of the glass fiber reinforced laminated nonwoven fabric which provides good workability, and have studied the thermocompression bonding conditions, and finally arrived at the present invention. The present invention will be described in detail below.

  The two-layer non-woven fabric sandwiching the glass fiber of the present invention may be either a long-fiber non-woven fabric or a short-fiber non-woven fabric, but a long-fiber non-woven fabric having generally high strength is preferable, and a spun-bonded non-woven fabric is particularly preferable. The material of the non-woven fabric includes, but is not limited to, polyester, polyamide, polyolefin resin, etc. Among them, a polyester resin having excellent properties such as strength and heat resistance is preferable, and polyethylene terephthalate (hereinafter referred to as “PET”). ) Is more preferably used. A non-woven fabric blended with polyester other than PET may be used as long as it is 10% by mass or less. The intrinsic viscosity of the PET resin used for the PET nonwoven fabric is not particularly limited, but is preferably 0.6 or more.

  The fineness of the fibers (single fibers) forming the two-layer nonwoven fabric sandwiching the glass fiber of the present invention is preferably 0.1 dtex or more and 10 dtex or less, and more preferably 1 dtex or more and 5 dtex or less. When the fineness is less than 0.1 dtex, the strength and tear strength of the non-woven fabric are lowered, and the physical properties after asphalt processing are lowered. Further, if the fineness exceeds 10 dtex, the fibers become thick and hinder the reduction of the thickness of the nonwoven fabric, so that the flexibility of the glass fiber reinforced laminated nonwoven fabric after asphalt processing cannot be obtained.

The basis weight of the two-layer non-woven fabric sandwiching the glass fiber of the present invention is preferably 30 g / m ² or more and 100 g / m ² or less, and more preferably 40 g / m ² or more and 80 g / m ² or less. When the basis weight is less than 30 g / m ² , the strength and elongation required for the glass fiber reinforced laminated nonwoven fabric cannot be obtained. Further, when the basis weight exceeds 100 g / m ² , the amount of fibers in the nonwoven fabric is large, and the thickness required for flexibility and the flexibility of the glass fiber reinforced laminated nonwoven fabric after asphalt processing cannot be obtained.

  The glass fiber used in the present invention may be either a multifilament or a monofilament, but a multifilament is preferred. Known glass fibers can be used as the glass fibers. Further, the glass fiber is preferably thin as long as the strength of the glass fiber reinforced laminated nonwoven fabric for asphalt waterproofing base fabric can be maintained, and the fineness of the glass fiber is preferably 20 tex or more and 50 tex or less, and the fiber diameter is 0.7 mm or less. preferable. If the fineness of the glass fiber is less than 20 tex, the fiber becomes thin and the necessary strength cannot be obtained, and further, it is broken by the heat press bonding process and the necessary initial stress cannot be obtained. When the fineness exceeds 50 tex, the fibers become too thick, and the thickness of the glass fiber reinforced laminated nonwoven fabric for asphalt waterproofing base fabric due to the thermocompression bonding is difficult to decrease, and the glass fibers cause unevenness to deteriorate the quality.

  The glass fiber of the present invention is preferably inserted at a predetermined interval substantially parallel to the longitudinal direction (machine direction during manufacturing) between nonwoven fabrics. The insertion pitch is preferably 2 to 30 mm, more preferably 2 to 10 mm, further preferably 3 to 6 mm. If the insertion pitch is increased, unevenness is likely to occur on the surface due to the shrinkage of the nonwoven fabric after the asphalt impregnation. When the insertion pitch is reduced, the flexibility of the laminated nonwoven fabric is reduced.

  As the resin (binder resin) to be impregnated into the laminated non-woven fabric in which two layers of non-woven fabric and glass fiber are laminated, known resins such as urea-based, melamine-based and acrylic-based, epoxy-based thermosetting resins and thermoplastic resins are used. These can be used in combination as appropriate. The heat resistance during asphalt processing of the laminated nonwoven fabric is imparted by controlling the amount of the above resin adhered. The adhesion amount of the resin is preferably 10% by mass or more and 40% by mass or less of the laminated nonwoven fabric, more preferably 20% by mass or more and 30% by mass or less. Within this range, the heat resistance during asphalt processing of the laminated nonwoven fabric and the asphalt impregnability can be compatible. If the amount of resin adhered is less than 10% by mass, heat resistance cannot be imparted, and the resin may not be able to withstand the process tension during asphalt processing, and breakage and winding problems are likely to occur. On the other hand, if it exceeds 40% by mass, the impregnating property of asphalt is lowered and the rigidity of the glass fiber reinforced laminated non-woven fabric is increased so that the tear strength of the glass fiber reinforced laminated non-woven fabric for asphalt waterproofing base fabric is apt to be lowered.

An example of the method for producing the glass fiber reinforced laminated non-woven fabric for an asphalt waterproofing base fabric of the present invention is shown below.
First, a PET spunbonded nonwoven fabric is manufactured by a known method. Subsequently, a plurality of glass fibers are inserted between the two layers of PET spunbonded nonwoven fabric so as to be present substantially parallel to the longitudinal direction of the nonwoven fabric, laminated and then laminated and integrated by needle punching to obtain a laminated nonwoven fabric. The laminated nonwoven fabric thus obtained is subjected to thermocompression bonding treatment and then impregnated with a resin to produce a glass fiber reinforced laminated nonwoven fabric.

  Examples of the thermocompression bonding method include a method of thermocompression bonding between an embossing roll and a flat calender, or between a flat calender and a flat calender. The heating temperature of the thermocompression bonding treatment is preferably 190 ° C. or higher and 220 ° C. or lower, and more preferably 195 ° C. or higher and 210 ° C. or lower. The applied linear pressure in the thermocompression treatment is preferably 200 N / cm or more and 350 N / cm or less, more preferably 225 N / cm or more and 325 N / cm or less. The processing speed of the thermocompression bonding process is preferably 8 m / min or more and 15 m / min or less, more preferably 10 m / min or more and 13 m / min or less.

If the heating temperature of the thermocompression bonding treatment is less than 190 ° C., the thickness of the glass fiber reinforced laminated nonwoven fabric cannot be sufficiently reduced to the desired thickness. Further, when the heating temperature exceeds 220 ° C., the shrinkage of the glass fiber reinforced laminated nonwoven fabric becomes large.
If the linear pressure applied in the heat compression treatment is less than 200 N / cm, the thickness of the glass fiber reinforced laminated nonwoven fabric cannot be sufficiently reduced to the desired thickness. Further, when the pressing linear pressure exceeds 350 N / cm, the glass fibers are broken and it becomes difficult to obtain the strength required for the glass fiber-reinforced laminated nonwoven fabric.
If the processing speed of the thermocompression bonding process is less than 8 m / min, the productivity will be poor. Further, when the processing speed exceeds 15 m / min, the glass fibers are broken under the above production conditions in which the heating temperature and the linear pressure applied are increased in order to sufficiently reduce the thickness of the glass fiber reinforced laminated nonwoven fabric to a desired thickness. As a result, it becomes impossible to obtain the strength required for the glass fiber reinforced laminated nonwoven fabric.

  The pressure-bonding area ratio of the embossing roll when using the embossing roll is preferably 8% or more and 15% or less, and more preferably 10% or more and 13% or less. When the pressure-bonding area ratio is less than 8%, the pressure-bonding area decreases, and it becomes difficult to reduce the thickness of the glass fiber-reinforced laminated nonwoven fabric. Further, when the pressure-bonding area ratio exceeds 15%, the pressure-bonding area increases, and the glass fiber is broken at the embossed portion, making it difficult to obtain the strength required for the glass fiber-reinforced laminated nonwoven fabric.

As a method of impregnating the resin, it is preferable to immerse the laminated nonwoven fabric in a container containing a resin (emulsion), that is, a so-called dipping method, to impregnate the laminated nonwoven fabric with the resin and appropriately dry the resin.
The obtained resin-impregnated non-woven fabric is preferably passed through a drying and curing step to form a resin film. By impregnating a large amount of resin into the nonwoven fabric by dipping, a glass fiber reinforced laminated nonwoven fabric that is a resin-impregnated nonwoven fabric having excellent heat resistance can be obtained.

The unit weight of the glass fiber reinforced laminated nonwoven fabric of the present invention is preferably 100 g / m ² or more and 200 g / m ² or less, more preferably 120 g / m ² or more and 180 g / m ² or less, and 140 g / m ² or more and 170 g / m ² or less. More preferable. If the basis weight is less than 100 g / m ^{2, the} lateral tensile strength required for the asphalt waterproofing base fabric after asphalt processing may be insufficient. If the basis weight exceeds 200 g / m ² , the flexibility of the asphalt waterproofing base fabric after asphalt processing will be poor and the workability at the time of construction will be poor.

  The thickness of the glass fiber reinforced laminated nonwoven fabric of the present invention is 0.4 mm or more and 0.6 mm or less, preferably 0.42 mm or more and 0.56 mm or less, and more preferably 0.45 mm or more and 0.52 mm or less. If the thickness is less than 0.4 mm, the lateral tensile strength required for the asphalt waterproofing base fabric after asphalt processing may be insufficient. Further, if the thickness exceeds 0.6 mm, the flexibility of the asphalt waterproofing base fabric after asphalt processing will be poor, and the workability at the time of construction will be poor.

The value of the weight per unit area / thickness of the glass fiber reinforced layered nonwoven fabric of the present invention is not more than 0.25 g / cm ³ or more 0.35 g / cm ^3, preferably 0.27 g / cm ³ or more 0.33 g / cm ³ or less, 0 .28g / cm ³ or more 0.31 g / cm ³ or less is more preferable. The thickness of the glass fiber reinforced laminated non-woven fabric is, of course, small when the unit weight is low. The glass fiber reinforced laminated non-woven fabric of the present invention has a unit weight which does not lack the tensile strength in the lateral direction required for the asphalt waterproofing base fabric after asphalt processing, but has a small thickness, and the thickness is small because the unit weight is small. This rule is provided so that the glass fiber reinforced laminated non-woven fabric of the present invention is not included.

  The glass fiber reinforced laminated non-woven fabric of the present invention can withstand the process tension during asphalt processing, so that the stress at the time of 2% elongation during heating is 80 N / 5 cm or more, preferably 90 N / 5 cm or more, and 100 N / 5 cm. The above is more preferable. The stress of the glass fiber in the glass fiber reinforced laminated non-woven fabric is maximized when it is stretched by 2% when heated, and the damage of the glass fiber can be controlled by the 2% stretch stress when heated. That is, when the stress at the time of 2% elongation at the time of heat of the glass fiber reinforced laminated nonwoven fabric is less than 80 N / 5 cm, it means that the glass fibers in the glass fiber reinforced laminated nonwoven fabric are damaged and sometimes broken. The upper limit value of the stress at the time of 2% elongation at the time of heating is not particularly limited, but is usually 200 N / 5 cm or less.

  The resin adhesion amount of the glass fiber reinforced laminated non-woven fabric of the present invention is preferably 10% by mass or more and 30% by mass or less, more preferably 15% by mass or more and 25% by mass or less. If the resin adhesion amount is less than 10% by mass, the heat resistance becomes poor. Further, when the resin adhesion amount exceeds 30% by mass, the flexibility of the asphalt waterproofing base fabric after asphalt processing is deteriorated and the workability at the time of construction is deteriorated.

  The present invention will be described in more detail with reference to the following examples, but the following examples are not intended to limit the present invention, and it is all within the technical scope of the present invention to carry out modifications without departing from the spirit of the present invention. To be done.

<Non-woven fabric weight>
According to the method described in JIS L 1913 (2010) 6.2, the size was measured at 20 cm × 20 cm (unit: g / m ² ).

<Thickness of non-woven fabric>
In accordance with the method described in JIS L 1913 (2010) 6.1, the measurement was carried out at a size of 10 cm × 230 cm with a tabletop measuring instrument (stylus = φ14.3 mm), and a load of 0.49 N / cm ² at n = 40. .. The average value of the obtained thickness was made into thickness (unit: mm).

<2% stress when the nonwoven fabric is heated in the longitudinal direction>
In accordance with the procedure described in JIS L 1913 (2010) 6.3.1, using a constant speed extension type tensile tester (Tensilon manufactured by Orientec) and a constant temperature bath of the same tester, at a temperature of 160 ° C, from the product width of the nonwoven fabric 20 pieces of a sample piece having a width of 50 mm and a length of 200 mm were sampled, the short side of the sample piece was grasped so that the grasping interval was 100 mm, and the tensile rate was 200 mm / min. The average value was defined as the stress at the time of 2% elongation when heated at 160 ° C. (unit: N / 5 cm).

<Flexibility of glass fiber reinforced laminated nonwoven fabric after asphalt processing>
The obtained non-woven fabric was impregnated with modified asphalt (SBS 12% by mass, straight asphalt 180-200 63% by mass, filler 25% by mass) at 2000 g / m ² and then further 2000 g / m ^{2 on} both sides thereof. The quality asphalt layer is provided on both sides as evenly as possible (the amount of modified asphalt is 4000 g / m ² ). The sample with the modified asphalt attached had a thickness of 3.3. The modified asphalt sheet, which is a sample, is prepared by adjusting the thickness to be mm.
The obtained modified asphalt sheet for measurement was subjected to a constant temperature for 5 points each having a width of 50 mm and a length of 100 mm, both without treatment and after heating, according to the procedure described in JIS A 6013 (2005) 7.12 for bending resistance. It was bent at 180 ° using a tank and a bending device, and the presence or absence of cracks on the outer surface was measured. Those without cracks were evaluated as ◯, and those with cracks were evaluated as x.

<Example 1>
Using polyethylene terephthalate (PET) with an intrinsic viscosity of 0.65 dl / g, using a round cross-section nozzle with a diameter of 0.30 mm, melt spinning at a spinning temperature of 285 ° C, single hole discharge rate of 1.25 g / min, and take it out with an ejector. While opening the fibers, the speed was adjusted so that the fiber arrangement was random on the net conveyor and the fibers were deposited. A web having a basis weight of 60 g / m ² made of long fibers having a single yarn fineness of 2.7 dtex was obtained. Then, embossing was performed at a linear pressure of 25 kN / m at 195 ° C. with an embossing roll in which the pyramidal frustum-shaped convex portions having a crimping area ratio of 7% were staggered to obtain a thermocompression-bonded spunbond.
A glass filament (glass yarn ECG1501 / 01ZY-95 manufactured by Nippon Electric Glass Co., Ltd. (count 33.1 tex, tensile strength 0.39 N / tex or more, single fiber diameter 9 .2 ± 1.0 μm) is inserted in the longitudinal direction (longitudinal direction) and laminated, and then entangled with a needle punch at a needle density of 50 needles / cm ² and a needle needle depth of 12 mm (the needle uses FPD220 manufactured by Organ). Then, a glass fiber laminated non-woven fabric was obtained.
The glass fiber laminated non-woven fabric obtained above is heat-pressed at a linear pressure of 284 N / cm and a processing speed of 10 m / min between an embossing roll and a flat calender at 195 ° C., and then urea melamine resin and acrylic resin are attached by a dip method. (A solid content of 21%). Then, after drying at 150 ° C. for 5 minutes, heat treatment was performed at 180 ° C. for 5 minutes to prepare a glass fiber reinforced laminated nonwoven fabric. The physical properties of the obtained glass fiber reinforced laminated nonwoven fabric are summarized in Table 1.

<Example 2>
A glass fiber reinforced laminated non-woven fabric was prepared in the same manner as in Example 1 except that the thermocompression bonding treatment was changed to a linear pressure of 268 N / cm between the calender rolls at 195 ° C. and a processing speed of 10 m / min. did. The physical properties of the obtained glass fiber reinforced laminated nonwoven fabric are summarized in Table 1.

<Example 3>
A glass fiber reinforced laminated non-woven fabric was prepared in the same manner as in Example 1 except that the heating and pressure treatment was changed to a linear pressure of 345 N / cm between the embossing roll and the calender roll at 210 ° C. and a processing speed of 8 m / min. did. The physical properties of the obtained glass fiber reinforced laminated nonwoven fabric are summarized in Table 1.
<Comparative Example 1>
A resin-impregnated laminated nonwoven fabric was prepared in the same manner as in Example 1 except that the laminated nonwoven fabric was prepared without inserting the glass filament. Table 1 shows the physical properties of the obtained resin-impregnated laminated nonwoven fabric.

<Comparative example 2>
A glass fiber reinforced laminated non-woven fabric is prepared in the same manner as in Example 1 except that the linear pressure is 180 N / cm between the embossing roll and the flat calender at 180 ° C. and the processing speed is 12 m / min. did. The physical properties of the obtained glass fiber reinforced laminated nonwoven fabric are summarized in Table 1.

<Comparative example 3>
A glass fiber reinforced laminated nonwoven fabric was prepared in the same manner as in Example 1 except that the linear pressure was changed to 440 N / cm between the embossing roll and the flat calender at 195 ° C. and the processing speed was 10 m / min. did. The physical properties of the obtained glass fiber reinforced laminated nonwoven fabric are summarized in Table 1.

<Comparative example 4>
A glass fiber reinforced laminated non-woven fabric was prepared in the same manner as in Example 1 except that the linear pressure was changed to 340 N / cm between the embossing roll and the flat calender at 195 ° C. and the processing speed was 8 m / min. did. The physical properties of the obtained glass fiber reinforced laminated nonwoven fabric are summarized in Table 1.

  The asphalt waterproofing base fabric using the glass fiber reinforced laminated nonwoven fabric for asphalt waterproofing base fabric of the present invention is a flexible asphalt waterproofing base fabric after asphalt processing, so that the base fabric is flexible when used in a self-adhesion method etc. As a result, an asphalt waterproofing base fabric having an extremely excellent workability can be obtained, which is a great contribution to the industrial world.

Claims (4)

A glass fiber reinforced laminated non-woven fabric obtained by impregnating a resin into a laminated non-woven fabric in which a plurality of glass fibers are present between two layers of non-woven fabric substantially parallel to the longitudinal direction of the non-woven fabric, and having a thickness of 0.4 mm or more and 0.6 mm. Glass having a basis weight / thickness value of 0.25 g / cm ³ or more and 0.35 g / cm ³ or less, and a stress of 80% N / cm or more at 2% elongation when heated in the longitudinal direction is 80 N / 5 cm or more Fiber reinforced laminated non-woven fabric. The glass fiber-reinforced laminated non-woven fabric for an asphalt waterproofing base fabric according to claim 1, which has a basis weight of 100 g / m ² or more and 200 g / m ² or less.   The glass fiber reinforced laminated non-woven fabric according to claim 1 or 2, wherein the non-woven fabric is a long fiber non-woven fabric.   The glass fiber reinforced laminated non-woven fabric for an asphalt waterproofing base fabric according to claim 3, wherein the long fiber non-woven fabric is a polyethylene terephthalate spunbonded non-woven fabric.