JPH07189129A - Mesh resin processed cloth - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a mesh-shaped resin processed cloth which is excellent in flame resistance, stain resistance, and weather resistance, is light in weight, does not easily cause misalignment, and emits no harmful gas during incineration. [Structure] A substantially thermoplastic synthetic resin having a melting point of less than 270 ° C. and a thermal decomposition temperature of 300 ° C. or more is added to a mesh-like fabric composed of a copolymer flame-retardant polyester fiber as a resin adhesion amount relative to a fiber weight. 3% or more and 30% or less adhered, and antifouling property is 70% or more. Weather meter 1
A mesh resin processed cloth having a sealing strength retention rate of 50% or more after irradiation for 000 hours and an opening area of the mesh of 0.1 to 100 mm ² .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh-like resin-processed cloth which is used for construction work mesh sheets, tents and the like, and is lightweight and excellent in flameproofness, stainproofing and weather resistance.

[0002]

2. Description of the Related Art Conventionally, as a mesh resin processed cloth, a cloth made of organic fibers or inorganic fibers coated with a resin in an amount equal to or more than the weight of the cloth is used. Polyvinyl chloride resins have been the mainstream resin for coating from the viewpoints of flame resistance, stain resistance, and weather resistance.
Such a resin-processed cloth has a problem of having a large basis weight and generating a large amount of hydrogen chloride gas when incinerated.

In recent years, a mesh sheet for construction work, which is made of a copolymer flame-retardant polyester fiber and is coated with a resin other than a vinyl chloride resin, has been studied for the purpose of dehalogenation. However, the mesh sheet does not impair flameproofness. It has been difficult to perform resin processing for preventing misalignment of the strip-shaped cloth. For this reason, a leno weave design is used to prevent misalignment, but this does not allow the mesh opening to be large, and the fabric weight is large, resulting in poor lightness. In addition, since the resin is not processed, stains tend to be deposited between the fibers, and the stain resistance is poor. Further, since the fibers are directly irradiated with ultraviolet rays, there is a problem that the weather resistance is poor.

[0004]

The conventional mesh-shaped resin processed cloth must be coated with a large amount of polyvinyl chloride resin in order to improve flameproofness, which causes a problem of generation of harmful gas during incineration. was there. Although the problem of incineration can be alleviated if the coating amount of polyvinyl chloride resin is reduced,
There is a problem that the flameproof property is deteriorated, and further, the mesh sheet sealing effect cannot be sufficiently obtained. When a resin having a high sealing effect is used, there are problems that flame resistance is deteriorated and weather resistance and stain resistance are deteriorated even when a copolymer flame-retardant polyester fiber is used as a mesh substrate. The present invention is to provide a mesh-shaped resin processed cloth which is free from such problems and is excellent in flameproof property, antifouling property and weather resistance and is lightweight.

[0005]

Means for Solving the Problems The present inventors can achieve the above object by subjecting a mesh-like fabric made of a copolymer flame-retardant polyester fiber to resin processing without impairing the flame retardancy of the fiber itself. As a result of extensive studies on the resin processing method, it was found that the object can be achieved by coating a specific resin on a mesh cloth made of copolymer flame-retardant polyester fiber, and the present invention has been completed.

That is, according to the present invention, a mesh cloth made of copolymer flame-retardant polyester fibers has a melting point of 27.
A substantially thermoplastic synthetic resin having a temperature of less than 0 ° C. and a thermal decomposition temperature of 300 ° C. or more has a resin adhesion amount of 3 to the fiber weight.
% Or more and 30% or less, and the antifouling property is 70% or more, the sealing strength retention rate after irradiation with a weather meter for 1000 hours is 50% or more, and the opening area of the mesh is 0.1% or more.
It is a mesh-shaped resin processed cloth having a size of 100 mm ² .

[0007]

The mesh-shaped resin-treated cloth of the present invention is obtained by resin-processing a copolymer flame-retardant polyester fiber cloth. The copolymer flame-retardant polyester fiber used in the present invention is, for example, JP-A-53-56250, JP-A-63-15823, JP-A-63-280728, or JP-A-1-2.
A polyester fiber obtained by copolymerizing a phosphoric acid ester described in JP-A-84521 and JP-A-1-266219. Such a copolyester fiber is easily melted when it comes into contact with flame, and so-called melt drip does not occur so that it does not spread. As flame-retardant polyester fibers, there are those that knead a flame retardant in addition to such a copolymer type, but those that knead a phosphoric ester will cause melt drip, but have sufficient flame retardance. In order to obtain, the kneading amount must be increased,
The strength of the polyester fiber is reduced. Further, in the case of polyester fiber in which a flame retardant such as a bromine compound or aluminum hydroxide is kneaded, although it does not spread,
Since the fibers are decomposed and carbonized to assist the combustion of the resin-processed resin, the resin-processed cloth produced by the method of the present invention does not exhibit flame retardancy.

A mesh fabric made of copolymer flame-retardant polyester fibers has a breathability of 0.1 to 0.1% after resin processing.
A coarse fabric with 100 mm ² openings is used. As long as the size of the opening is in the range of 0.1 to 100 mm ² , it is not particularly limited, such as mesh fabric and mesh knitting, but it is a coarse fabric from the viewpoint of strength per unit weight and morphological stability. preferable. As such a coarse woven fabric, a plain woven fabric may be used, but since a plain woven fabric is likely to cause misalignment during resin processing and is inferior in workability, a leno weave or a mock weave design is preferable. In this case, the stability of the structure is only required to ensure process passability at the time of resin processing, and it is not always necessary to firmly fix the structure. One example of a preferable mock weave structure is shown in FIG. 1, but the present invention is not limited to this.

Further, the form of the yarns constituting the mesh-like cloth may be either filaments or spun yarns, but from the viewpoint of antifouling property, the filaments having no fiber fluff on the surface are preferable. In particular, since the filament woven fabric is likely to cause misalignment, the effect of the present invention is remarkable. The thickness of the thread is not particularly limited and may be appropriately selected within the range conventionally used, for example, 250 to 200.
Threads with a thickness of about 0 denier are used.

The resin used for resin processing has a melting point of 270 ° C.
And a substantially thermoplastic synthetic resin having a thermal decomposition temperature of 300 ° C. or higher is used. The adhesion rate is 3% or more and 30% or less, and preferably 4% or more 2 with respect to the weight of the fiber.
It is 0% or less. When the melting point of the resin is higher than 270 ° C., the melt drip of the flame-retardant polyester fiber melted at the time of flame contact is hindered and sufficient flame retardancy cannot be obtained. Further, if the thermal decomposition temperature is lower than 300 ° C., sufficient flame retardancy cannot be obtained because, for example, the decomposition gas is ignited before melt drip during flame contact, or it is decomposed and carbonized and does not melt drip. The melting point referred to in the present invention is the peak temperature of the endothermic curve obtained by differential scanning calorimetry (DSC) in air, and the thermal decomposition temperature is that of the weight loss curve obtained by thermogravimetric analysis (TG) in air. This is the temperature at the inflection point.

The melting point is less than 270 ° C. and the thermal decomposition temperature is 300.
Examples of the substantially thermoplastic synthetic resin having a temperature of not less than 0 ° C. include, but are not necessarily limited to, polyester resins, polyamide resins, polyurethane resins, and the like. These resins may be flame-retarded resins, but do not have to be flame-retardant as long as they melt-drip with the copolymer flame-retardant polyester fiber. Among them, polyamide resins are preferable because they have good antifouling properties, weather resistance, and washing resistance, and the change of the filling force of the cloth during use is small. As a polyamide resin, nylon 6, nylon 66, nylon 12
Or a copolymer of two or more of them, and isophthalic acid for imparting flexibility and water dispersibility to them, 5-
A polymer obtained by copolymerizing an isophthalic acid sulfonate salt such as (alkali sulfo) isophthalic acid and polyethylene glycol diacetate is useful.

The substantially thermoplastic synthetic resin includes a small amount of a thermosetting resin in the above-mentioned thermoplastic resin for the purpose of adjusting hardness, improving adhesiveness with copolymer flame-retardant polyester fiber and the like. It means that you can stay. As such a thermosetting resin, an epoxy resin, a melamine resin, an isocyanate resin or the like is preferable. Further, it is preferable to mix a known light stabilizer, an ultraviolet absorber, and a colorant in the thermoplastic synthetic resin from the viewpoint of weather resistance and aesthetics of the cloth.

The synthetic resin has an effect of filling the voids between the fibers constituting the yarns and preventing deformation due to misalignment of the mesh-like structure due to the sliding of the yarns, that is, a sealing effect. Furthermore, by making the yarn surface smooth and reducing the space between the single fibers, it is possible to prevent dirt from entering and depositing inside the fiber bundle, and to provide an antifouling effect. For that purpose, the amount of the resin adhered is 3% or more and 30% or less, preferably 4% or more and 20% or less with respect to the fiber weight. If the adhered amount is less than 3%, it is not possible to sufficiently fill the voids between the fibers, and thus it is not possible to obtain a sufficient sealing effect or antifouling property, and if the adhered amount exceeds 30%, Although there is no problem with the smoothness of the yarn surface and the sealing effect, the fabric weight of the resin-processed cloth becomes too large, and the flame retardancy decreases.
As for the sealing effect, it is preferable that the sealing strength measured by the method described later is 8 kgf or more.

The synthetic resin is applied to the flame-retardant polyester fiber cloth in the form of a solution or a dispersion, but in order to coat the yarn surface with a smaller amount of adhesion, an aqueous dispersion is used instead of the organic solvent solution. Preference is given to using. The flame-retardant polyester cloth is dipped and squeezed in an aqueous resin dispersion.
Dry and cure if necessary. When an aqueous dispersion is used, the resin tends to migrate from between fibers to the yarn surface or near the texture point of the fabric during drying, and the irregularities on the yarn surface are filled with a relatively small amount of adhesion.
Antifouling property and sealing strength are easily obtained.

The resin-processed cloth of the present invention is required to have a retaining rate of 50% or more after sealing with a weather meter for 1000 hours. It is preferably 70% or more, more preferably 80% or more. If the strength retention rate is less than 50%, misalignment will occur during outdoor use,
The morphology of the mesh becomes unstable.

The sealing strength referred to in the present invention is, as shown in FIG. 2, 1 in the width of 10 fiber bundles forming a mesh structure.
Prepare a strip-shaped sample with a length of 70 mm, and
In the length of m, one means the strength (maximum value) when the fiber bundles start to shift when cutting 4 pieces from the outside of the width and 2 pieces on the other side of the inside and pulling to both sides with a tensile tester The average of vertical, horizontal and horizontal. The fiber bundle forming the mesh structure is, for example, in the case of the dummy weave design shown in FIG. 1, since three warps and three wefts are bundled to form a mesh. It means a bundle of fibers in which each three fibers are combined.

The resin-treated cloth of the present invention must have an antifouling property of 70% or more. It is preferably 80% or more, more preferably 85% or more. The antifouling property referred to in the present invention is the operation of placing a 4 cm × 4 cm test piece in a wide-mouthed bottle together with 100 g of a synthetic soiling substance having the following composition, acclimating the mixture at 80 ° C. for 15 minutes, and then stirring for 1 minute four times. , Wavelength 400-700 after sample is taken out, washed with water and dried
This is represented by the residual rate of visible light reflectance of nm. Synthetic fouling material: mulch 38% Cement 17% Kaolin 17% Silica gel 17% Carbon black 1.75% Ferric oxide 0.5% Mineral oil 8.75%

The opening area of the mesh referred to in the present invention is
The area of the space which comprises a mesh is chosen at least at random, and the average value of 10 or more is shown as the area per mesh.

[0019]

EXAMPLES The present invention will be described below with reference to specific examples, but the present invention is not limited to these descriptions.

[0020] Examples 1-3, Comparative Examples 1 and 2 750 denier / 72 Mosha fabric tissue shown in Figure 1 consisting of copolymerized flame retardant polyester filament filaments (basis weight 240 g / m ^2), melting point as the resin 130 ℃,
Nylon-based resin (copolymer of nylon 6, nylon 66 and nylon 12) having a thermal decomposition temperature of 350 ° C., a water emulsion having a resin solid content concentration of 30% (10 PHR of nonionic activator containing polyethylene glycol as a main component was added. (Emulsification) is appropriately diluted with water to give a resin adhesion rate of 2%,
Dipping treatment was performed so as to be 5%, 10%, 20% and 35%, and curing was performed at 160 ° C. for 2 minutes. The performance of the obtained mesh-shaped resin processed cloth is shown in Table 1. Each of the samples of the present invention having a resin adhesion rate in the range of 3 to 30% sufficiently satisfied the performance required for the mesh resin processed cloth. Those having a small resin adhesion rate of 2% had insufficient weather resistance and had low sealing strength. Further, those having a high resin adhesion rate of 30% had insufficient flameproofness.

[0021]

[Table 1] Each evaluation method was as follows. Sealing strength: Average of vertical and horizontal 3 points according to the sealing strength test method Antifouling property: Remaining rate of reflectance in the above antifouling property evaluation test Flameproof property: According to JIS A8952 Weather resistance: 1000 by sunshine weather meter Retention rate of sealing strength after irradiation for a long time

[0022]

INDUSTRIAL APPLICABILITY The resin-treated cloth of the present invention is superior to the conventional resin-treated cloth coated with a polyvinyl chloride resin in spite of being excellent in flameproof property, antifouling property, weather resistance and misalignment prevention property. It is lightweight with a unit weight of about half. In addition, with the same weight, the strength is more than doubled, and the durability and safety are greatly improved. For this reason, it is easy to transport when used as a curing mesh sheet at a construction site, easy to handle at the time of expansion and withdrawal, the work load is reduced, and the weight load on the seat mounting frame is small. Has the excellent effect of. In addition, there is little generation of harmful gas when it is disposed of, and the burden on the environment is also small.

[Brief description of drawings]

FIG. 1 is an example of an organization chart of a mesh woven fabric (mock weave) used for a resin-processed fabric of the present invention.

FIG. 2 is a schematic view of a sample for evaluating the sealing property of the resin-processed cloth of the present invention.

[Explanation of symbols]

 1,1 'Fiber bundle cutting part (4 cutting) 2 Fiber bundle cutting part (2 cutting)

Claims (1)

[Claims] 1. A substantially thermoplastic synthetic resin having a melting point of less than 270.degree. C. and a thermal decomposition temperature of 300.degree. Adhesion of 3% or more and 30% or less by weight, antifouling property of 70% or more, retention rate of sealing strength after weather meter irradiation for 1000 hours is 50% or more, opening area of mesh is 0.1 to 100 mm ² mesh-like resin processed cloth.