JPH11158748A - Resin-treated cloth for industrial material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain cloth for industrial materials having tenacity and stretch recovery both required for industrial cloth, and also excellent in resistance to water, wind, light and heat. SOLUTION: This cloth is prepared by weaving a polyester fiber, which has propylene terephthalate monomer units as principal repeating units and has an intrinsic viscosity of >=0.7, the breaking strength of >=5g/d and the breaking elongation of >=12%, into at least part of the cloth, and then by resin- treating the cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fabric having excellent stretch recoverability, and relates to a construction net, a tent,
The present invention relates to a fabric having excellent mechanical strength and high dimensional stability required for industrial applications such as reinforcing materials for various membrane materials, seat materials for office and vehicle chairs, and the like.

[0002]

2. Description of the Related Art In recent years, fishery applications such as fishing nets and nets,
Many fabrics are used for industrial applications such as various membrane reinforcing materials, cushion materials for chairs and beds, and the like. These fabrics are used in fields where high stress is repeatedly applied, and fabrics having high strength and excellent dimensional stability are required. At the same time, there are demands for waterproofness and windproofness for applications used outdoors, and light-shielding properties depending on the application. Conventionally, polyethylene terephthalate, nylon 6, or nylon 6, 6 and the like have been used in fields where strength is required. For applications requiring waterproof and windproof properties, resin processing, for example, vinyl chloride resin compound Fabrics coated on the outer layer have been used.

[0003] For example, in a construction net or a tent ground, it is necessary to simultaneously satisfy high strength, stretch recovery rate, and waterproofness, windproofness, and light-shielding properties. However, polyethylene terephthalate, nylon 6, or nylon 6,
Even in fabrics that have been subjected to resin processing on 6 etc., dimensional stability,
It was not particularly excellent in stretch recovery.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fabric having both high strength and dimensional stability in view of the prior art. In particular, it is an object of the present invention to provide a fabric having good elongation recovery properties in industrial material fabrics often used repeatedly under high stress.

[0005]

That is, the present invention provides a propylene terephthalate having an intrinsic viscosity of 0.7 or more as a main repeating unit, a breaking strength of 5 g / d or more, and a breaking elongation of 12 or more.
% Of a polyester fiber for at least a part of the fabric.

The intrinsic viscosity of the polymer used in the present invention must be 0.7 or more. When the intrinsic viscosity is less than 0.7, the strength required for fibers for industrial materials cannot be obtained. A more preferred intrinsic viscosity is 0.8 or more.

Some of the constituent fibers must be polyester fibers containing propylene terephthalate as a main repeating unit.

More specifically, the polyester in the present invention is directed to a polyester containing terephthalic acid as a main acid component and trimethylene glycol as a main glycol component. Further, a polyester in which part of the terephthalic acid component is replaced by another difunctional carboxylic acid component may be used, and / or part of the glycol component is replaced by the above-mentioned glycol or other diol component other than the main component. It may be polyester. Examples of the bifunctional carboxylic acid other than terephthalic acid used herein include, for example, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-hydroxyethoxybenzoic acid, p-oxybenzoic acid, adipic acid And aromatic, aliphatic and alicyclic bifunctional carboxylic acids such as, sebacic acid and 1,4-cyclohexanedicarboxylic acid. Further, as the diol component other than the above glycol, for example, ethylene glycol, tetramethylene glycol, cyclohexane-
Aliphatic, alicyclic, such as 1,4-dimethanol, neopentyl glycol bisphenol A, bisphenol S,
Examples thereof include aromatic diol compounds and polyoxyalkylene glycols. Further, as long as the polyester is substantially linear, a polycarboxylic acid such as trimellitic acid and pyromellitic acid, a polyol such as glycerin, trimethylolpropane, and pentaerythritol, 5-hydroxyisophthalic acid, and 3,5-dihydroxybenzoate Monomers having three or more functional ester-forming groups, such as acids, can be used. Further, a blend of the above-mentioned polymer or copolymer may be used.

In the present invention, the polyester fiber composed of the above-mentioned dicarboxylic acid component and diol component is satisfactory in terms of flexural fatigue properties, elongation recovery properties and dyeing properties unless the propylene terephthalate component is at least 50% of the whole. No material is available. It is particularly preferred that 80 mol% or more of the repeating units are propylene terephthalate units.

Furthermore, a small amount of other optional polymers, antioxidants, antistatic agents, dye improvers, dyes, pigments, matting agents, fluorescent brighteners, inert fine particles and other additives may be added to the polyester in small amounts. An agent may be contained. In particular, when adding inert fine particles, any of the external precipitation method and the internal precipitation method can be adopted.

The breaking strength and elongation of the constituent fibers constituting the fabric according to the present invention are respectively 6 g / d or more and 12% or more.
The above is necessary. When the breaking strength is less than 6 g / d, the number of components required to obtain a predetermined fabric strength increases,
It is not preferable because the weight and thickness of the fabric increase. A preferred breaking strength is 7 g / d, and a more preferred breaking strength is 8 g / d.
d or more. Further, when the elongation at break of the fiber is less than 12%, since the elongation is small even if the strength is high, the breakage due to stress concentration is apt to occur and the breaking strength and impact resistance are poor, which is not preferable as a fabric for industrial materials. Preferred elongation at break is 1
5% or more.

The resin used in the present invention is applicable to any resin such as a vinyl chloride resin, an acrylic resin, a polyester resin, and a polyolefin resin. The resin processing method includes coating, topping, laminating, and the like, and any of these methods may be used. The resin processing may be performed on one side or both sides.

The filament to be formed preferably has a denier of 100 denier or more. In this case, the filament may be a multifilament or a monofilament. The larger the single yarn denier,
It is preferable because durability such as heat resistance and light resistance is improved. Preferred single yarn denier is 3 denier or more. If the constituent filaments are less than 100 denier, it is necessary to increase the number of driving filaments in order to obtain the strength required for industrial materials, which is not preferable because the weaving process becomes complicated. The constituent denier may be large, but if it is too large, problems such as thickening of the cloth and coarseness occur. It is preferably at most 5,000 denier, more preferably at most 3,000 denier.

In order to achieve the intended object of the present invention, the above P
It is more preferable that 40% or more of the PT fiber is used in each of the weft directions of the fabric. More preferably, it is 60% or more. When the PPT fiber is used in both the weft directions, it is preferable to use the same amount in the weft direction in terms of the balance of the fabric, but the present invention is not limited to this.

When PPT fibers are used in combination with other fibers, the yarn properties such as heat shrinkage and elongation at break of the yarn, and the yarn composition such as the constituent fineness and single yarn denier have the same value. Are preferred. This is necessary in order to make the cloth surface even and to improve the strength utilization rate in the cloth. The difference in each property is 5% or less, more preferably 3% or less, the elongation at break is 10% or less, more preferably 5% or less in dry heat shrinkage (150 ° C. × 30 minutes). Within denier, more preferably within 400 denier, the single yarn denier difference is within 3 denier.

The cover factor K of the fabric according to the present invention is desirably 440 or more in both the weft and longitudinal directions. If the K value is less than 440, the strength required for the industrial material fabric is not satisfied, which is not preferable. A more preferred K value is 500 or more.

Further, it is preferable that the K value of the fabric of the present invention be the same in both the longitudinal directions, because the mechanical properties of the fabric are well balanced, but it is not limited thereto.

The fabric according to the present invention is most preferably plain weave, but the present invention is not limited to this, and PPT fibers may be used for other woven fabrics such as twill and satin, or a part of knitted fabric.

As described above, a fabric for industrial materials obtained by subjecting a fabric using the polyester fiber of the present invention to at least a part thereof to resin treatment has excellent stretch recovery properties and is required for industrial material applications such as high strength. It is possible to satisfy various physical properties. In particular, by setting the single yarn denier of the fiber to be used to 3 denier or more, the durability such as light resistance and heat resistance is improved, so that a more preferable industrial fabric can be obtained.

[0020]

The present invention will be described in more detail with reference to the following examples. In addition, the thing and evaluation in an Example were calculated | required as follows.

Raw yarn elongation: Measured according to the method described in JIS L 1013. In addition, 300mm of pulling speed
/ Min, and a gripping distance of 250 mm.

Fabric strong elongation; JIS L 1096 1
The measurement was performed according to the method described in 2.1 (Method A). In addition, it measured by the labeling strip method with the width of a test piece of 50 mm, and a grip interval of 200 mm and a pulling speed of 100 mm / min. Preferred strength is 200 kg / 5 cm or more.

Stretch recovery rate; JIS L 1096 6.
Performed by a method according to 14.2 (Method C). However, the extension rate was set to 20% of the grip interval. Preferred stretch recovery is 8
5% or more.

Resin coating amount: The amount of weight increase due to coating per square meter of cloth was taken as the resin coating amount.

Measurement of air permeability; JIS L 1096 6.
The measurement was performed according to 27.1 (Method A). The preferred ventilation is
0.5 cm3 / cm2 S or less.

(Examples 1 to 4) A polypropylene terephthalate resin having an intrinsic viscosity of 0.70 was preliminarily dried at 80 ° C. for 4 hours at a vacuum of 0.1 mmHG, and then subjected to solid-state polymerization at 180 ° C. for 20 hours under the same vacuum conditions. And the intrinsic viscosity is 0.99
5 PPT resin was obtained. After the solid-phase polymerization, the vacuum was broken with nitrogen gas, and the container was transferred to a container without touching the outside air. The obtained PPT resin was melted by a screw-type extruder adjusted to 280 ° C., and then spun at the same spinning temperature of 280 ° C., cooled at 20 ° C. with a cooling air of 0.3 m / s, and cooled at 500 m / min. At the spinning speed, and once wound up. The undrawn yarn was preheated with a hot roller adjusted to 60 ° C, stretched 5.8 times under steam at 120 ° C, and heat-set with a hot roll set at 140 ° C at a relaxation rate of 3%. The resulting drawn yarn had a total denier of 1,000 denier, a single yarn denier of 5.2 denier, a breaking strength of 8.1 g / d and a breaking elongation of 19%. Using the drawn yarn in the weft direction at 100%, various plain weaves having a weaving density of 15 to 25 yarns / in in both the weft directions were prepared. To the obtained fabric, 100 parts of vinyl chloride resin paste, 60 parts of plasticizer DOP, 2 parts of Ba-Zn-based stabilizer, 5 parts of calcium carbonate, 1 part of isocyanate-based adhesiveness improver, 1 part of benzophenone-based lightfastness improver,
The resin mixed with 4 parts of a white colorant titanium oxide was applied to the fabric by a hand coating method. After application, drying was performed at 120 ° C. × 3 minutes, and heat treatment was performed at 185 ° C. × 5 minutes. Table 1 shows the obtained physical properties.

[0027]

[Table 1]

From these results, it was found that the greige fabric not subjected to resin processing had a large air permeability, and was not a preferable fabric particularly in applications requiring air permeability and water resistance.

(Comparative Example 1) The same conditions as in Example 2 were used, except that a yarn (hereinafter referred to as PET fiber) using polyethylene terephthalate resin (intrinsic viscosity 0.993) obtained by the same method as in Example 2 was used. And weaving and resin application. First, the resulting drawn yarn had a total denier of 1000 denier, a single yarn denier of 5.3 denier and a breaking strength of 8.6 g / d.
The breaking elongation was 16%. Next, the properties of the obtained fabric are shown in Table 2. Although the strength and the like of the constituent fibers are preferable,
The obtained fabric was not preferable as a fabric for industrial materials because the stretch recovery rate was insufficient.

[0030]

[Table 2]

(Examples 5 to 7) The ratio of PPT fiber and PET fiber in both directions is 3: 1 (Example 5), 1: 1 ratio (Example 6) and 1: 3 ratio (implementation). In Example 7), a woven fabric was prepared. Table 3 shows the results.

[0032]

[Table 3]

As a result, it was revealed that the woven fabric having a ratio of PPT fiber to PET fiber of 25:75 has a slightly insufficient elongation recovery rate, and is not sufficient as a fabric for industrial materials.

[0034]

According to the present invention, it is possible to provide a fabric for industrial materials which is excellent in waterproofness, windproofness, light resistance and heat resistance and which has the strength and elongation recovery required for industrial material fabrics. did.

Claims (4)

[Claims] 1. A breaking strength of 5 g / d using propylene terephthalate having an intrinsic viscosity of 0.7 or more as a main repeating unit.
As described above, a resin-processed cloth for industrial materials, which is obtained by processing a resin using polyester fiber having a breaking elongation of 12% or more for at least a part of the cloth. 2. The resin processed fabric for industrial materials according to claim 1, wherein the cover factor K in each of the weft directions represented by the following formula is 440 or more. K = (denier) ^1/2 x (weave density) [books / in] 3. The resin-processed fabric for industrial materials according to claim 1, wherein the polyester fiber is a filament having a denier of 100 denier or more. 4. The resin-processed cloth for industrial materials according to claim 1, wherein the polyester fiber is used in an amount of 40 wt% or more in each of the weft directions.