JP2000253796A - Water-permeable structure having adhesion preventing effect on aquatic organism, sensor cover and filer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject structure disusing the application of an antifouling coating material to a sensor detecting part, etc., having high stability to an environment and the human body, having no bad influence on the aquatic environment, capable of preventing the adhesion of aquatic organism for a long period of time by molding a specific thermoplastic resin as a main resin into a molding product having a specified opening part. SOLUTION: This water-permeable structure comprises a molding product composed of a thermoplastic resin containing pyridine-triphenylborane of the formula or its derivative as a main resin. The molding product has an opening part with >=5 cc/cm2.sec flow volume under 18 cm water column. The water- permeable fiber structure is formed from a thermoplastic fiber containing pyridine-triphenylborane of the formula or its derivative as a main constituent fiber and can have >=5 cc/cm2.sec flow volume under 18 cm water column.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-permeable fibrous structure used for a long period of time in contact with seawater or freshwater, for example, even when it is coated with an article that dislikes aquatic organisms such as a water quality measurement sensor. The present invention relates to a water-permeable structure that has good water flow between the inside and outside of a coating, can maintain an accurate water quality measurement environment, and can effectively prevent adhesion of aquatic organisms to a sensor. Furthermore, the present invention relates to a filter that can stably distribute seawater, freshwater, and the like for a long period of time.

[0002]

2. Description of the Related Art In recent years, the water quality of rivers and oceans, such as dissolved oxygen, pH, temperature, salinity, ammonia, turbidity, etc., is continuously measured and monitored. Technologies for predicting sudden environmental changes, natural disasters, etc. in advance and utilizing them for fish culture and disaster prevention have been studied, and sensors and systems that automatically measure these data have been developed and put into practical use. Consideration is being given to the development of this technology. However, when the sensor is continuously immersed in water in order to automatically measure data on water quality, when the sensor of the sensor is detected, algae such as blue seaweed and diatoms, coelenterates such as sea anemones and hydroids, and sea sponge etc. Aquatic organisms such as sponges, ring-shaped animals such as kansane kansetsu, tactile objects such as bryozoans, arthropods such as red barnacles, protozoa such as white squirrels, mollusks such as mussels and oysters adhere, and it takes 2-3 days. In a short period of time, the water quality data becomes abnormal and measurement becomes impossible. For this reason, it was necessary to frequently remove these aquatic organisms or perform repairs such as replacing sensors. In addition, such a measurement system is often installed offshore, requiring a large amount of labor for repair, and has hindered the spread of the measurement system.

[0003] Therefore, it has been studied to apply an organic tin-based antifouling paint such as tributyltin oxide, triphenyltin oxide, triphenyltin acetate to a so-called sensor cover that protects a detection portion of a sensor.
It could not be used due to its environmental pollution, toxicity to humans and marine life, and adverse effects on data. Further, when the antifouling paint is applied to the sensor detecting section itself, there is a problem that the detecting section does not come into contact with water, and the water quality cannot be measured.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the need to apply antifouling paint to a sensor detecting section and a sensor protective cover, to provide high safety to the environment and the human body, and not to adversely affect the water environment. Another object of the present invention is to provide a water-permeable structure capable of preventing the attachment of aquatic organisms for a long period of time. Further, an object of the present invention is that when a water quality measurement sensor cover is used, aquatic organisms do not adhere to the sensor for a long time,
It is an object of the present invention to provide an underwater sensor cover capable of acquiring accurate water quality data for a long period of time without hindering free circulation of water inside and outside of a vehicle partitioned by the sensor cover. Still another object of the present invention is to provide a filter capable of suppressing the attachment of aquatic organisms for a long period of time when the filter is used for seawater or freshwater and capable of moving water stably.

[0005]

That is, the present invention relates to a molded article containing, as a main resin, a thermoplastic resin containing pyridine-triphenylborane or a derivative thereof.
A water-permeable structure comprising a molded product having an opening having a water flow rate of 8 cc / cm ² · sec or more under 8 cm.

Embedded image Further, the present invention relates to a fibrous structure containing thermoplastic fibers containing pyridine-triphenylborane or a derivative thereof as a main constituent fiber, and having a water flow rate of 5 cm below a water column of 5 cm.
It is a water-permeable fiber structure characterized by being at least cc / cm ² · sec. Furthermore, a fibrous structure containing, as a main constituent yarn, a resin-coated yarn coated with a thermoplastic resin containing pyridine-triphenylborane or a derivative thereof, and having a water flow rate of 5 cc / cm ² .cm under a water column of 18 cm. It is a water-permeable fiber structure characterized by being not less than sec. Further, the present invention is an underwater sensor cover comprising the water-permeable structure having the above-mentioned structure and having a water flow rate of 15 cc / cm ² · sec or more under a water column of 18 cm. Furthermore, the present invention is a water column 18cm
This is a seawater or freshwater filter with a water flow rate of 10 cc / cm ² · sec or more below.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The pyridine-triphenylborane used in the present invention has the structure shown above, but a derivative of the compound can be used in the present invention. Halogen-substituted pyridine-triphenylborane such as 3-bromopyridine-triphenylborane, 4-methylpyridine-triphenylborane, and the like, as described in Japanese Patent No. 311679.
Lower alkyl-substituted pyridine-triphenylborane such as -ethyl-triphenylborane. Although the content of pyridine-triphenylborane or a derivative thereof in the thermoplastic resin cannot be determined unconditionally depending on the form of the structure, the effect of preventing adhesion of aquatic organisms to the structure is not considered. Considering this, it is preferably 0.1% by weight or more, and more preferably 50% by weight or less. This is because even if the content is increased, the improvement of the effect reaches a plateau, and problems in the manufacturing process of the structure and the handleability appear. A more preferred content is in the range of 3 to 20% by weight.

Further, other antifouling compounds can be appropriately added as an auxiliary agent. Specific examples of the auxiliary agent include:
For example, 3- (3,4-dichlorophenyl) -1,1-
Dimethylurea, manganese ethylenebisdithiocarbamate, zinc ethylenebisdithiocarbamate, bisdimethyldithiocarbamoyl zinc ethylenebisdithiocarbamate, copper zinc, copper thiocyanate, bis (2
-Pyridylthio-1-oxide), N- (dichlorofluoromethylthio) -N ', N'-dimethyl-N-phenylsulfide, 4,5-dichloro-2-n-octylisothiazolin-3-one, 2,3 , 5,6-tetrachloro-4-methylsulfonylpyridine, 3-iodo-2
-Propynylbutyl carbamate and the like.

The thermoplastic resin containing pyridine-triphenylborane or a derivative thereof and the above-mentioned auxiliary agent includes:
Polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and polyhexamethylene terephthalate (PHMT), polyamides such as nylon 6, nylon 66, nylon 12, and nylon 4, polyolefins such as polyethylene and polypropylene, polyvinyl chloride, Examples thereof include polyvinyl alcohol and polyacrylonitrile.

Terephthalic acid and 1,6-hexanediol are preferred in terms of volatilization and thermal decomposition of the above-mentioned pyridine-triphenylborane or its derivative and the auxiliary agent during melt molding at a high temperature, and uniform kneading with a resin. Polyester having polyhexamethylene terephthalate (PHMT) as a basic unit is preferable, and a polyester obtained by copolymerizing the polyester with isophthalic acid in an amount of 5 to 20 mol% is more preferable in terms of processability, heat melting properties and the like.

In addition to the above-mentioned isophthalic acid, components to be copolymerized with the polyester include ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol and cyclohexane-1,4.
Diol components such as dimethanol, tricyclodecane dimethanol, polyethylene glycol and polytetramethylene glycol, isophthalic acid, naphthalene-2,6-
Dicarboxylic acid, phthalic acid, α, β- (4-carboxyphenoxy) ethane, 4,4-dicarboxydiphenyl,
Acid components such as 5-sodium sulfoisophthalic acid, adipic acid and sebacic acid, and esters thereof. The copolymerization rate is not particularly limited, but pyridine-triphenylborane or a derivative thereof and a sustained release of an auxiliary agent,
Considering the handling properties of the polymer such as the crystallinity, glass transition point, melting point or softening point of the polyester, it is preferable that each of the diol component and the acid component be in the range of 5 to 50 mol%.

The thermoplastic resin preferably has a melting point of 150 ° C. or less, 160 ° C., and a capillary length of 10 m.
m, the capillary diameter is 1 mm, and the melt viscosity under the conditions of a shear rate of 1000 sec ^-1 is preferably 10,000 poise or less. In order to adjust to these conditions, the melting point may be lowered by copolymerization as described above. In addition, a melting point depressant such as a medium molecular polymer such as polysiloxane, polybutene, liquid paraffin, or liquid polyester can be appropriately contained.

Further, in the above-mentioned thermoplastic resin, a pyridine-triphenylborane or a derivative thereof, a sustaining release controlling agent, an ultraviolet absorber, a conductivity improving agent, a modifier such as a crystallization retarder, a coloring pigment, etc. Can be appropriately contained.

Next, a method for producing the water-permeable structure of the present invention will be described. First, in order to form a molded article comprising a thermoplastic resin containing pyridine-triphenylborane or a derivative thereof, for example, using a twin-screw kneading extruder, pyridine-triphenylborane or a derivative thereof and a desired thermoplastic resin, And if necessary, an antifouling auxiliary, a modifier, and an additive are uniformly melt-kneaded, and this is, for example, extruded from a die slit to produce a sheet-like material, or injection-molded to a desired shape. It can be formed into a three-dimensional molded product or extruded from a spinning nozzle to be converted into a fiber. When a molded article is formed into a three-dimensional molded article such as a box or a cylinder, a sheet-shaped article may be combined into a three-dimensional molded article. In the case of fiberization, a conventional melt spinning apparatus can be used as a fiber production apparatus, and the cross-sectional shape of the fiber may be any of circular, various irregular shapes, and hollow, and further, pyridine-triphenylborane or a derivative thereof. It is also possible to make a core-sheath type composite fiber or a side-by-side type composite fiber by combining a thermoplastic resin containing at least part of the resin with at least a part of the fiber surface and combining with another thermoplastic resin.

In the case of forming a resin-coated yarn in which a thermoplastic resin containing pyridine-triphenylborane or a derivative thereof is coated on a core yarn, there is a method in which the thermoplastic resin is dissolved in a solvent and applied to the surface of the core yarn. However, in the present invention, for example, the raw materials are uniformly kneaded using a twin-screw kneader, and FIG.
Pyridine-triphenylborane or a derivative thereof is applied to the surface of the core yarn by a manufacturing process (melt extrusion coating method) as shown in FIG. 3, which is provided with a pressure die for coating the core yarn with a resin as shown in FIG. Desirably, a method of producing a resin-coated yarn by directly coating the contained resin. The material used as the core yarn, for example, synthetic fibers, recycled fibers, natural fibers,
It is selected from metal fibers, glass fibers, carbon fibers, and the like, and preferably has a melting point, softening point, or decomposition point that is 50 ° C. or higher than the above-described compound-containing resin. Further, the form of the core yarn is not particularly limited, and irrespective of monofilaments, multifilaments, spun yarns, etc., and ply-twisted yarns composed of these can be used as necessary.

Next, a method for obtaining a fibrous structure from the thermoplastic fiber or the resin-coated yarn will be described. In addition, the fiber structure referred to in the present invention includes a composite material such as a woven fabric, a knitted fabric, a nonwoven fabric, and a fabric. First, in the method of obtaining a woven fabric, the loom can be a shuttle loom, a rapier loom, an air jet loom, a gripper loom, and the like, and the woven fabric is not particularly limited. Weaving or the like can be used. Also, as a method of obtaining a knit,
Knitted fabrics such as warp knitting, inlay knitting, pile knitting, jazz cloth, weft insertion Russell knitting and the like can be manufactured by a Russell machine or a tricot machine. Weft knitting, stitch bonding,
And a braid can also be obtained with a braid. In addition, the wet method,
Nonwoven fabrics formed by various manufacturing techniques such as a dry method for forming a card web, a spun bond method, and a melt blow method, and fabrics obtained by melt bonding, adhesive bonding, and mechanical bonding can be used.

However, for the above-mentioned woven fabric, knitted fabric, non-woven fabric and cloth-like material, the woven fabric should have a woven density of warp and weft yarns, respective yarn It is necessary to appropriately select a denier or the like, a knitted fabric with a mesh opening, a nonwoven fabric with a basis weight, and a cloth-like material with an appropriate combination.

In the present invention, a composite of a thermoplastic resin and a fibrous structure can be used. For example, a fibrous structure (woven fabric, woven fabric, natural fiber, synthetic fiber, inorganic fiber, etc.)
Knitted fabric, non-woven fabric and fabric-like material), a method of applying a thermoplastic resin dissolved in a solvent or the like to the surface, an extrusion coating method of directly bonding a thermoplastic resin to a fiber structure when extruding the thermoplastic resin into a sheet, After producing a film or a sheet, there is a method of performing heat lamination or dry lamination on a fiber structure. In this case, it is sufficient that at least one of the thermoplastic resin layer and the fiber structure contains pyridine-triphenylborane or a derivative thereof. Since these structures have no or very low water permeability, it is necessary to provide openings so that the structures have a desired water flow rate.

Further, the structure of the present invention may be composed only of a molded article, a fiber, and a coated yarn having an aquatic organism adhesion preventing function, as long as the aquatic organism adhesion preventing function is not substantially impaired. Laminating other resins, synthetic fibers, inorganic fibers, natural fibers, and the like which do not have an aquatic organism adhesion preventing function may be mixed or combined for use. The mixing ratio cannot be determined unequivocally because it needs to be changed depending on the type of aquatic organisms that inhabit it and the strength of the aquatic organism adhesion prevention function of molded articles, fibers, and coated yarns, depending on the corresponding water area. It is desirable that molded articles, fibers, and coated yarns having an aquatic organism adhesion preventing function account for 50% or more of the above.

In the present invention, the form of these structures is not particularly limited.
5 cm / cm ² · sec or more, preferably 10 cm
It is important that it is at least cc / cm ² · sec, more preferably at least 15 cc / cm ² · sec. Here, the measurement of water flow rate is shown in FIG.
Is measured using a device as shown in FIG.
In FIG. 1, a water supply port 2 is provided at an upper portion of a side surface of a cylindrical container 1, an opening 4 is provided at a cylindrical container bottom 3, and a water-permeable structure A is fixed to the opening 4. A drain port 5 is provided on the side of the cylindrical container, which corresponds to a height of 18 cm from the surface of the container, and always overflows from the drain port so that a water column having a height of 18 cm is always held on the structure. Such excess water is supplied from the water supply port, and the amount of water that falls through the structure in such a state is determined, and cc / cm ²
・ It is displayed in the unit of sec.

The present inventors use a water quality measurement sensor,
To monitor water quality data stably and accurately for a long period of time, in order to accurately measure the quality of seawater and freshwater in the process of conducting various studies by covering the sensor so that aquatic organisms do not adhere to it, It was found that accurate water quality data could not be obtained unless the water to be measured was constantly flowing near the sensor, not to mention that no organisms adhered to the detection unit. In order to ensure an effective concentration that does not hinder the adhesion of aquatic organisms without obstructing the water quality, the water flow rate of the water quality measurement sensor cover must be 15 cc / cm ² · sec or more, and furthermore, 15 to 50 cc. / cm ² · sec was found to be a preferable range. Through water volume is 15cc / cm ² · sec
Below, the true water quality near the sensor is affected by the cover, and accurate water quality measurement is not possible. If the amount of water passing is too large, an effective concentration of an antifouling agent for suppressing the adhesion of aquatic organisms may not be ensured, and the aquatic organisms may easily adhere to the sensor. In applications where the accuracy of water quality measurement is not required and the effect of preventing the adhesion of aquatic organisms is prioritized, the water flow rate is 5 cc / cm ² · sec.
All that is required is the above.

Further, the fiber structure of the present invention can be used in a filter installed in a seawater intake section used for cooling in a thermal power plant, a nuclear power plant, or the like, or in a golf course, in addition to a cover for a water quality measurement sensor. It is also effectively used as a filter for seawater or freshwater, such as a filter for adsorptive filtration of pesticides from wastewater containing pesticides.
5cm passing water under the water column is 10cc / cm ² · sec or more, preferably preferably 15~50cc / cm ² · sec. If the water flow rate is less than 10 cc / cm ² · sec, when a large amount of cooling water flow is required, the resistance is too large and it is not suitable as a filter.
On the other hand, if the water flow rate is too large, an effective concentration of the antifouling agent for suppressing the adhesion of aquatic organisms may not be secured, and, for example, the aquatic organisms may easily adhere to the cooling pipe.

Further, in order to effectively suppress the attachment of aquatic organisms while ensuring such water flow, it is desirable to appropriately control the amount of pyridine-triphenylborane or its derivative eluted from the structure. Specifically, the average of the amount of elution into artificial seawater (sodium chloride 3%, magnesium chloride 0.5%, distilled water 96.5%) for the first 10 days is 1000 mg / m ² at an artificial seawater temperature of 25 ° C.・ It is less than days,
It is preferable that the amount be 100 mg / m ² · day or more at 15 ° C.

In the present invention, the form of the fibrous structure is preferably a mesh fabric from the viewpoint of easy control of water flow, ease of production, strength of the product, dimensional stability and the like. In this case, it is preferable to use a woven fabric having a mesh size of about 10 to 30 mesh as an absolute value of the opening of the woven fabric in addition to the water flow from the viewpoint of the filter effect and the like.

By using the structure of the present invention for the above-mentioned applications, aquatic organisms have been attached within a few days from the start of use, and it is necessary to clean and replace the sensor cover and filter quite frequently. In the above-mentioned field, there is a feature that aquatic organisms do not adhere for more than several months and a smooth water flow can be maintained.

[0025]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. In addition, each evaluation in an Example was evaluated by the following method.・ Aquatic organisms attached to sensors Multi-item water quality monitor “model 6000 (YSI, D8.
9cm x L49.5cm) ", and immersed in the sea at a depth of 15m in Shirahama, Wakayama Prefecture. evaluated. Criteria 5: No adhesion of organisms was observed. 4: Adherence of organisms was observed on about 10% of the entire surface of the object. 3: Adherence of organisms was observed on about 20% of the entire surface of the object. 2: Adherence of organisms was observed on about 50% of the entire surface of the object. 1: Adherence of organisms was observed on the entire surface of the object. -Dissolved oxygen Measured continuously by a water quality measurement system connected to "model 6000".

Example 1 Polyhexamethylene terephthalate copolymerized with isophthalic acid at 10 mol% (melting point 135 ° C., melt viscosity 3500 poi)
se), 10% by weight of pyridine-triphenylborane and polybutene having an average molecular weight of 3000 (manufactured by Idemitsu Petrochemical Co., Ltd .;
000H) and 0.4% by weight of a black pigment made of carbon, and a polyethylene terephthalate filament (500
d / 96f, 120t / m single twist) 100 parts by weight,
200 parts by weight were coated to obtain 1500 d of an antifouling resin-coated yarn. From the obtained antifouling resin-coated yarn, using a rapier loom, plain weave, vertical 1500d, 15 threads / inch, horizontal 1500d
A woven fabric having 15 meshes / inch and an aperture of 16 mesh was obtained. Using a heat set machine with a furnace length of 3 m × 3 zones, this was
The intersection was thermally fused at a processing speed of 25 ° C. × 1.5 minutes.
The water passing amount of the obtained woven fabric was 50 cc / cm ² · sec. Next, this was cut into 30 cm x 65 cm, and "model600
0 ”, immersed in the sea of Shirahama, Wakayama Prefecture,
Dissolved oxygen was continuously measured, and the state of attachment of aquatic organisms was observed. The results are shown in Table 1. 1 for sensor detector
No organisms were attached for months, and no abnormalities were observed in the dissolved oxygen data.

[0027]

[Table 1]

Example 2 The method of Example 1 was repeated except that the weaving density was adjusted to 1500 dr.
A plain woven fabric was obtained in the same manner as in Example 1 except that the mesh size was 26 mesh and the water flow rate was 27 cc / cm ² · sec.
This was coated on a water quality monitor model 6000, dissolved oxygen was measured in the sea of Shirahama, and the state of attachment of aquatic organisms was observed. The results are shown in Table 1. No organisms adhered to the sensor detection part for two months, and no abnormality was observed in the dissolved oxygen data.

Example 3 The method of Example 2 was repeated, except that the weft was 1500d / 288f.
In the same manner as in Example 1 except that the polyethylene terephthalate yarn was changed to a plain woven fabric having a mesh size of 16 mesh and a water flow rate of 14 cc / cm ² · sec. This is a water quality monitor
Covering model 6000, measuring dissolved oxygen in the sea of Shirahama, observing the state of aquatic organisms adhesion, the results are shown in Table 1.
It was shown to. No organisms adhered to the sensor detection part for one month, and no abnormality was observed in the dissolved oxygen data.

Example 4 In the method of Example 1, polyhexamethylene terephthalate obtained by copolymerizing 10% by mole of isophthalic acid was converted to low-density polyethylene (melting point: 105 ° C., melt viscosity: 3000 poise).
Except that the aperture was changed to 1 in the same manner as in Example 1.
A plain fabric having 6 meshes and a water flow rate of 50 cc / cm ² · sec was obtained. This was coated on a water quality monitor model 6000, dissolved oxygen was measured in the sea of Shirahama, and the state of attachment of aquatic organisms was observed. The results are shown in Table 1. No organisms adhered to the sensor detection part for one month, and no abnormality was observed in the dissolved oxygen data.

Example 5 Polybutene having an average molecular weight of 3,000 and a polybutene having an average molecular weight of 3,000 in polyhexamethylene terephthalate (melting point: 132 ° C., melt viscosity: 3,000 poise) obtained by copolymerizing adipic acid at 15 mol% (manufactured by Idemitsu Petrochemical Co., Ltd.) , 2000
H) and 0.4% by weight of a carbon black pigment were kneaded with a twin-screw extruder and discharged from a T-die to obtain a 0.20 mm-thick antifouling resin film. The film is heat-laminated on both sides of a plain woven base cloth (500 d / 96f, 150 T / m single twisted yarn, density length 25 / inch, width 25 / inch) using polyethylene terephthalate filament to form an antifouling tarpaulin. Obtained. 6 mm in diameter every 1 cm in the vertical and horizontal directions of the tarpaulin
Was made to obtain a tarpaulin having a water flow rate of 48 cc / cm ² · sec. This was coated on a water quality monitor model 6000, the dissolved oxygen was measured in the sea of Shirahama, and the state of attachment of aquatic organisms was observed. The results are shown in Table 1. No organisms adhered to the sensor detection part for two months, and no abnormality was observed in the dissolved oxygen data.

Example 6 Polyhexamethylene terephthalate prepared by copolymerizing 30 mol% of butanediol (melting point: 126 ° C., melt viscosity: 4000 p
oise), 6% by weight of pyridine-triphenylborane,
Polybutene having an average molecular weight of 3000 (manufactured by Idemitsu Petrochemical Co., Ltd.
2000H) and 0.4% by weight of a carbon black pigment, kneaded with a twin screw extruder, and discharged from a T-die to obtain a 0.5 mm thick antifouling resin film.
Holes of 6 mm were made every 1 cm in the vertical and horizontal directions of the film to obtain a film having a water flow rate of 48 cc / cm ² · sec. This was coated on a water quality monitor model 6000, the dissolved oxygen was measured in the sea of Shirahama, and the state of attachment of aquatic organisms was observed. The results are shown in Table 1. No aquatic organisms adhered to the sensor detection part for two months, and no abnormality was observed in the dissolved oxygen data.

Example 7 A polyhexamethylene terephthalate copolymerized with 10 mol% of isophthalic acid was added with 1 pyridine-triphenylborane.
0% by weight, 6% by weight of polybutene having an average molecular weight of 3,000 (made by Idemitsu Petrochemical Co., Ltd., 2000H) and 0.4% by weight of a black pigment composed of carbon were kneaded with a 30φ twin screw extruder, and were then kneaded with a round hole nozzle. It was discharged and spun. The spun yarn was drawn by a roller plate method using a hot roller at 40 ° C., a hot plate at 75 ° C., and a draw ratio of 3.5 times, to obtain a multifilament of 500 dr / 96f.
This was twisted at 150 T / m, and woven with a plain weave at 15 T / m and 15 W / inch by a rapier loom to obtain a woven fabric with a basis weight of 16 mesh. The water passing amount of the obtained woven fabric was 24 cc / cm ² · sec. This is water quality monitor model6
000, the dissolved oxygen was measured in the sea of Shirahama, and the state of attachment of aquatic organisms was observed. The results are shown in Table 1. Aquatic organisms do not adhere to the sensor detector for 2 months,
No abnormalities were found in the dissolved oxygen data.

Comparative Example 1 In the method of Example 1, the weaving density was adjusted to 1500 d45.
Book / inch, horizontal 1500d 25 book / inch, aperture 46
A plain fabric was obtained in the same manner as in Example 1 except that the mesh and the water flow rate were changed to 1.0 cc / cm ² · sec. This was coated on a water quality monitor model 6000, dissolved oxygen was measured in the sea of Shirahama, and the state of attachment of aquatic organisms was observed. The results are shown in Table 1. The organism did not attach at all for 2 months, but there were some abnormal values indicating dissolved water in the dissolved oxygen data.

Comparative Example 2 The dissolved oxygen was measured in the sea of Shirahama with a water quality monitor model 6000 without covering. Abnormal values began to appear on the third day, and became unmeasurable one week later. As a result of pulling up and observing, a large amount of aquatic organisms adhered to the entire monitor and completely covered the sensor section.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus for measuring a water flow rate of a water-permeable structure.

FIG. 2 is a sectional view of a pressing die of an apparatus for manufacturing a resin-coated yarn.

FIG. 3 is a conceptual diagram of a manufacturing process of a resin-coated yarn.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical container 2 Water supply port 3 Cylindrical container bottom 4 Opening 5 Drainage port A Water-permeable structure

Continued on front page F-term (reference) 2B121 CC01 CC22 EA30 FA12 FA13 4J002 BB031 BB121 BD041 BE021 BG101 CF051 CF061 CF071 CL011 CL031 EY016 FD050 FD090 FD110 FD180 FD186 FD200 GD05 GK01 GQ00 4L0315 BA05 AB09 AC09

Claims (6)

[Claims] 1. A molded article comprising a thermoplastic resin containing pyridine-triphenylborane or a derivative thereof as a main resin, and having a water flow rate of 5 cc / cm ² · sec under a water column of 18 cm.
A water-permeable structure comprising a molded article having an opening as described above. Embedded image 2. A fibrous structure mainly composed of thermoplastic fibers containing pyridine-triphenylborane or a derivative thereof, and having a water flow rate of 5 cc under a water column of 18 cm.
/ cm ² · sec or more. 3. A fibrous structure mainly composed of resin-coated yarns coated with a thermoplastic resin containing pyridine-triphenylborane or a derivative thereof, and having a water flow rate of 5 cc / cm under an 18 cm water column. A water-permeable fibrous structure characterized by being at least ² cm ² · sec. 4. The water-permeable fiber structure according to claim 2, wherein the fiber structure is a mesh fabric. 5. The flow rate under a water column of 18 cm is 15 cc / cm ² · s.
The water-permeable structure according to any one of claims 1 to 4, which is an underwater sensor cover of ec or more. 6. The flow rate under a water column of 18 cm is 10 cc / cm ² · s.
The water-permeable fiber structure according to any one of claims 2 to 4, which is a filter for seawater or freshwater having an ec or more.