WO2024038869A1 - Selective growth promoter for algae - Google Patents

Selective growth promoter for algae Download PDF

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Publication number
WO2024038869A1
WO2024038869A1 PCT/JP2023/029579 JP2023029579W WO2024038869A1 WO 2024038869 A1 WO2024038869 A1 WO 2024038869A1 JP 2023029579 W JP2023029579 W JP 2023029579W WO 2024038869 A1 WO2024038869 A1 WO 2024038869A1
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Prior art keywords
growth promoter
algae
growth
rare earth
less
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PCT/JP2023/029579
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French (fr)
Japanese (ja)
Inventor
文人 小林
朋未 狩野
暁 寺田
厚 山田
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共同印刷株式会社
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Publication of WO2024038869A1 publication Critical patent/WO2024038869A1/en

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G33/00—Cultivation of seaweed or algae
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
    • A01P21/00—Plant growth regulators
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81—Aquaculture, e.g. of fish

Definitions

  • the present invention relates to a selective growth promoter for promoting attachment and growth of specific algae.
  • Seaweed beds serve as habitats for a wide variety of aquatic organisms, contribute to seawater purification, protect coastlines, and play a major role in maintaining the coastal and coastal environments.
  • seaweed beds are rapidly decreasing due to the development of coastal areas and ⁇ shore erosion.'' Causes of the decline in seaweed beds due to development include, for example, land reclamation, decreased seawater transparency, and the influx of chemicals into the sea.
  • "Isoyake” refers to a decrease in the productivity of algae due to changes in water temperature due to changes in ocean currents and a decrease in nutrient concentration due to a decrease in upwelling.
  • Patent Document 1 proposes an artificial seaweed bed growing device that includes an anchor pile, an arm attached to the upper part of the anchor pile, and an artificial seaweed attached to the arm.
  • Patent Document 2 proposes a longline type artificial floating algae in which artificial floating algae made of cut biodegradable plastic is fixed to a longline installed in the sea or on the seabed.
  • Patent Document 3 reports that rare earth ferrite having a specific composition has an anti-algae effect.
  • Patent Documents 1 and 2 artificially prepare an environment in which seaweed beds can be generated, and then leave the regeneration of the seaweed beds to the natural healing power of the sea.
  • the seaweed beds that are regenerated may not necessarily be suitable for the purpose of the area.
  • An object of the present invention is to provide a drug that exhibits a selective growth-promoting effect on algae and can make a seaweed bed suitable for the reproduction of desired algae.
  • the present invention is as follows.
  • ⁇ Aspect 1> A selective growth promoter for algae containing a rare earth ferrite.
  • the rare earth ferrite has the following formula (1): Ln 2x Fe 2 (1-x) O 3 (1)
  • Ln is a rare earth element selected from the group consisting of lanthanum, praseodymium, neodymium, and yttrium, and x is a number of 0.50 or more and less than 1.00.
  • the growth promoter according to aspect 1 having a composition represented by: ⁇ Aspect 3>
  • ⁇ Aspect 7> The growth promoter dispersion according to aspect 6, which is a paint, ink, or treatment liquid.
  • ⁇ Aspect 9> The growth promoting article according to aspect 8, which is a seaweed net or an artificial algae reef.
  • the algae selective growth promoter of the present invention has the effect of promoting the attachment and growth of green algae while suppressing the attachment and growth of red algae. Therefore, when the selective growth promoter of the present invention is applied to an artificial seaweed bed, it becomes possible to create a seaweed bed suitable for the reproduction of desired algae.
  • the algae selective growth promoter of the present invention contains rare earth ferrite.
  • Rare earth ferrite for example, has the following formula (1): Ln 2x Fe 2 (1-x) O 3 (1)
  • Ln is a rare earth element selected from the group consisting of lanthanum, praseodymium, neodymium, and yttrium, and x is a number of 0.50 or more and less than 1.00.
  • It may have a composition represented by:
  • the rare earth ferrite having the composition represented by the following formula (1) functions as an algaecide that exhibits an excellent algaecide effect.
  • this rare earth ferrite has the effect of promoting the attachment and growth of green algae while suppressing the attachment and growth of red algae.
  • the rare earth ferrite of the present invention may be in any form as long as x in the above formula (1) is a number of 0.50 or more and less than 1.00.
  • a solid solution with a uniform composition may be formed, a mixture of three LnFeO phases and three Ln 2 O phases, or a solid solution with a uniform composition, three LnFeO phases, and Ln 2 O It may be a mixture with three phases or may contain phases other than these. Further, part or all of the Ln 2 O 3 phase may be converted to Ln(OH) 3 , and such an embodiment is also included in the present invention.
  • x in formula (1) is 0.50 or more, and may be 0.55 or more, 0.60 or more, 0.65 or more, 0.70 or more, or 0.75 or more. x is less than 1.00, and may be 0.90 or less, 0.85 or less, 0.80 or less, 0.75 or less, 0.70 or less, 0.65 or less, or 0.60 or less .
  • x in the above formula (1) may be, for example, a number of 0.50 or more and 0.90 or less, and furthermore, may be 0.65 or more and 0.85 or less. In particular, it may be a number of 0.70 or more and 0.80 or less.
  • the rare earth (Ln) in formula (1) may particularly be lanthanum, from the viewpoints of suppressing red algae adhesion and growth, promoting green algae adhesion and growth, and cost.
  • the selective algal growth promoter of the present invention may therefore be lanthanum ferrite particles.
  • the particle size of the selective growth promoter of the present invention is preferably larger from the viewpoint of handling properties. From this point of view, the particle size may be, for example, 0.5 ⁇ m or more, 1.0 ⁇ m or more, 3.0 ⁇ m or more, 5.0 ⁇ m or more, or 10 ⁇ m or more. On the other hand, from the viewpoints of increasing the surface area per mass and preventing particles from falling off when applying the selective growth promoter of the present invention to articles as a paint, the smaller the particle size, the better. suitable. From this point of view, the particle size may be, for example, 15 ⁇ m or less, 12 ⁇ m or less, 10 ⁇ m or less, or 8.0 ⁇ m or less.
  • the method for producing the selective growth promoter of the present invention is not particularly limited.
  • the selective growth promoter of the present invention can be produced by, for example, applying an appropriate stress to a mixture containing a rare earth source and an iron source in a predetermined ratio, pulverizing and mixing the mixture, and then firing the mixture. good. If desired, water treatment may be performed after firing.
  • the rare earth source for example, oxides of desired rare earth elements may be used, as well as bastnaesite, monazite, xenotime, etc.
  • the rare earth element it is preferable to use lanthanum from the viewpoint of antibacterial properties of the obtained rare earth ferrite particles and cost. Among them, if La 2 O 3 is used, it is possible to produce a selective growth promoter that is highly effective and relatively inexpensive.
  • Iron sources include oxides such as FeO, Fe 3 O 4 and Fe 2 O 3 ; oxyoxides such as FeOOH, ferrihydrite and schubermannite; water such as Fe(OH) 2 and Fe(OH) 3 . oxide; etc. may be used.
  • FeOOH is used as an iron source, it has higher reactivity than Fe 2 O 3 etc., so it can be fired at a lower temperature, and the grain size is smaller compared to Fe 2 O 3 etc. Small selective growth promoters can be produced.
  • the ratio of the rare earth source and iron source may be determined as appropriate to match the value of x in formula (1) for the desired selective growth promoter.
  • the pulverization and mixing may be dry pulverization or wet pulverization.
  • the stress applied to the mixture of rare earth source and iron source during this pulverization may be, for example, friction force, shear force, shear stress, impact force, or the like.
  • Examples of the method of applying the above-mentioned stress include a method of wet pulverization in a ball mill.
  • a method of wet pulverization in a ball mill When grinding is carried out by wet grinding, water, alcohol, etc. may be used as the liquid medium. After the mixture of the rare earth source and the iron source is pulverized and mixed by wet pulverization, the liquid medium may be removed by an appropriate method such as heating and drying, if necessary.
  • the firing temperature and firing time are not particularly limited, and can be set as appropriate.
  • the firing temperature is, for example, 700°C or higher, 800°C or higher, 900°C or higher, or 1,000°C or higher, and, for example, 1,300°C or lower, 1,200°C or lower, 1,100°C or lower, or 1, It may be carried out at temperatures below 000°C.
  • the firing time is, for example, 1 hour or more, 2 hours or more, 3 hours or more, 4 hours or more, 6 hours or more, 8 hours or more, 12 hours or more, or 15 hours or more, and 72 hours or less, 48 hours or less, 36 hours or more. It may be carried out for less than 1 hour, 24 hours or less, 18 hours or less, or 15 hours or less.
  • the surrounding atmosphere during firing may be an oxidizing atmosphere, for example, firing may be performed in air.
  • Rare earth ferrite is obtained as described above. This rare earth ferrite may be used as the selective growth promoter of the present invention as it is, or the rare earth ferrite may be treated with water and then used as the selective growth promoter of the present invention.
  • the rare earth ferrite may be treated with water by any suitable method of bringing the rare earth ferrite into contact with water.
  • the following contact method may be used.
  • the rare earth ferrite may be brought into contact with liquid water at a temperature of, for example, 0° C. or higher, 10° C. or higher, or 20° C. or higher, and 100° or lower, 60° C. or lower, or 40° C. or lower. This method may be repeated. In this case, the treatment may be repeated until the conductivity of the treated water becomes the same as the conductivity of purified water.
  • the rare earth ferrite material may be brought into contact with water vapor at a temperature of 100°C or higher, 110°C or higher, or 120°C or higher, and 200°C or lower, 160°C or lower, or 140°C or lower.
  • contact with liquid water and contact with water vapor may be performed in combination.
  • drying may be performed as desired before the treated product is used as the selective growth promoter of the present invention.
  • This drying is carried out, for example, at a temperature of 100°C or higher, 110°C or higher, or 120°C or higher, and 200° or lower, 160°C or lower, or 140°C or lower for 1 hour or more, 2 hours or more, 4 hours or more, 6 hours or more. It may be carried out for a time of at least 8 hours, or at least 72 hours, at most 48 hours, at most 24 hours, or at most 18 hours.
  • the obtained selective growth promoter may be used after being pulverized to adjust the particle size, if necessary.
  • a selective algal growth promoter dispersion is provided.
  • the growth promoter dispersion of the present invention contains the growth promoter of the present invention, a resin, and a solvent, and may further contain a dispersant.
  • the growth promoter contained in the growth promoter dispersion of the present invention is the growth promoter of the present invention, and the above explanation can be used as is.
  • the resin contained in the growth promoter dispersion of the present invention forms a coating film on the surface of the article and functions as a binder for fixing the growth promoter particles to the article.
  • the resin may be soluble or highly dispersible in the solvent of the growth promoter dispersion.
  • the resin may be selected from, for example, acrylic resin, acrylic silicone resin, silicone resin, aminoalkyd resin, epoxy resin, phenol resin, polyurethane resin, unsaturated polyester resin, fluororesin, and the like.
  • the dispersant may be appropriately selected from known dispersants such as acrylic acid-based, carboxylic acid-based, sulfonic acid-based, and ammonium salt-based dispersants.
  • the dispersant may be an ammonium salt of an acrylic copolymer or an alkylolammonium salt of a copolymer having an acid group.
  • the solvent may be one or more selected from, for example, water, alcohol, ester, ketone, ether, aromatic hydrocarbon, and the like.
  • the content of the growth promoter in the growth promoter dispersion of the present invention is set such that the total solid content of the growth promoter dispersion is 100% by mass from the viewpoint of balancing selective growth promoting function and film forming properties. 5% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, or 25% by mass or more, and 60% by mass or less, 55% by mass or less, 50% by mass or less, 45% by mass or less. It may be less than 40% by mass, or less than 40% by mass.
  • the ratio of rare earth ferrite particles to the total mass of the growth promoter and resin balances the selective growth promoting function and good adhesion of the growth promoter to the coating film. From the point of view, it may be 10% by weight or more, 12% by weight or more, 15% by weight or more, 18% by weight or more, or 20% by weight or more, and 50% by weight or less, 45% by weight or less, 40% by weight or less, or 35% by weight or less. It may be less than % by mass.
  • the growth promoter dispersion of the present invention can be applied to an appropriate article to form an article for selectively promoting the growth of algae, for example.
  • the growth promoter dispersion may be in the form of a paint, ink, treatment liquid, etc., for example.
  • an article for selectively promoting the growth of algae is provided.
  • the growth promoting article of the present invention is an article having a coating film containing a growth promoting agent.
  • This coating film may be formed on at least a portion of the surface of any article.
  • the coating film in the growth promoting article of the present invention may contain a resin, a dispersant, etc. in addition to the growth promoting agent of the present invention. These resins and dispersants may be appropriately selected from the resins and dispersants contained in the growth promoter dispersion of the present invention.
  • the proportions of the growth promoter, resin, and dispersant used in the coating film of the growth promoting article of the present invention may also be the same as the proportions used in the growth promoter dispersion of the present invention.
  • the growth promoting article of the present invention may be, for example, a seaweed net, an artificial algae reef, etc.
  • a method for forming a seaweed bed is provided.
  • the method of forming a seaweed bed of the present invention is a method that includes installing the growth promoting article of the present invention in the sea or on the seabed.
  • the seawater or seabed may be the seawater or seabed where formation of a seaweed bed is desired.
  • the adhesion and growth of green algae is promoted while the adhesion and growth of red algae is suppressed, and a seaweed bed suitable for the reproduction of desired algae is formed.
  • formation here is a concept that includes "regeneration.”
  • the crushed material was treated with water.
  • the obtained crushed material is put into a washing tank, purified water is added and stirred, the treated water is removed by filtration, and then new purified water is added and stirring and filtration are repeated. It was carried out by the method.
  • the end point of the water treatment was defined as the point in time when the treated water and the purified water had the same conductivity.
  • the growth promoter of Example 1 was obtained by drying the crushed product after water treatment at 130°C for 15 hours and crushing it again with a hammer mill.
  • test paint The growth promoter synthesized above was added to the drug-free silicone paint manufactured by Bassel Chemical Co., Ltd. under the product name "SS Guard" so that the concentration of the growth promoter in the paint film was 30% by mass.
  • a test paint was prepared by adding xylene to dilute the solid content of the paint to 45% by weight and stirring thoroughly.
  • test net was prepared by dipping a commercially available polyethylene seaweed net into the test paint prepared above and then leaving it to dry at room temperature for one day (24 hours). did.
  • Example 1 A test net was prepared in the same manner as in Example 1, except that the silicone paint "SS Guard" without the addition of a growth promoter was used as the test paint, and an algae growth test was conducted. The results are shown in Table 1.
  • Example 1 coated with the silicone paint containing the growth promoter of the present invention exhibited an effect of preventing adhesion to red algae and an effect of promoting the growth of green algae.

Abstract

A selective growth promoter for algae that contains a rare-earth ferrite.

Description

藻類の選択的成長促進剤Selective growth promoter for algae
　本発明は、特定の藻類の付着及び成長を促進するための、選択的成長促進剤に関する。 The present invention relates to a selective growth promoter for promoting attachment and growth of specific algae.
　藻場は、多種多様な水生生物の生存場所となり、海水の浄化に寄与し、海岸線を保全する等、海岸及び近海の環境の維持に大きな役割を果たしている。 Seaweed beds serve as habitats for a wide variety of aquatic organisms, contribute to seawater purification, protect coastlines, and play a major role in maintaining the coastal and coastal environments.
　しかしながら、我が国では沿岸地域の開発、「磯焼け」等により、藻場が急速に減少しつつある。開発に起因する藻場の減少原因は、例えば、埋め立て、海水の透明度の低下、海への化学物質の流入等である。「磯焼け」とは、海流の変化による水温の変化、湧昇流の減少による栄養塩濃度の低下等が原因となって、藻類の生産力が低下することをいう。 However, in Japan, seaweed beds are rapidly decreasing due to the development of coastal areas and ``shore erosion.'' Causes of the decline in seaweed beds due to development include, for example, land reclamation, decreased seawater transparency, and the influx of chemicals into the sea. "Isoyake" refers to a decrease in the productivity of algae due to changes in water temperature due to changes in ocean currents and a decrease in nutrient concentration due to a decrease in upwelling.
　減少した藻場を再生するため、種々の取り組みがなされている。例えば、特許文献１には、アンカー杭と、アンカー杭の上部に装着された腕部と、腕部に取り付けられた人工海藻とから成る、人工藻場育成装置が提案されている。特許文献２には、海中又は海底に設置された延縄に、生分解性プラスチックを裁断した人工浮藻を固定して成る、延縄式人工浮藻が提案されている。 Various efforts are being made to regenerate diminished seaweed beds. For example, Patent Document 1 proposes an artificial seaweed bed growing device that includes an anchor pile, an arm attached to the upper part of the anchor pile, and an artificial seaweed attached to the arm. Patent Document 2 proposes a longline type artificial floating algae in which artificial floating algae made of cut biodegradable plastic is fixed to a longline installed in the sea or on the seabed.
　一方、船舶、護岸、漁網等の分野では、藻の発生を防止する必要がある。このような目的のために、特許文献３では、特定の組成を有する希土類フェライトに防藻効果があることが報告されている。 On the other hand, it is necessary to prevent the growth of algae in areas such as ships, sea walls, and fishing nets. For this purpose, Patent Document 3 reports that rare earth ferrite having a specific composition has an anti-algae effect.
特開２０１１－１３５８２８号公報Japanese Patent Application Publication No. 2011-135828 特開２００５－２３７３５７号公報Japanese Patent Application Publication No. 2005-237357 国際公開第２０２１／１９３６４４号International Publication No. 2021/193644
　特許文献１及び２の技術は、藻場が生成し得る環境を人工的に整えた後は、藻場の再生を海の自然治癒力に委ねるものである。この場合、再生される藻場は、必ずしも当該地域の目的に適うものになるとは限らない。 The techniques of Patent Documents 1 and 2 artificially prepare an environment in which seaweed beds can be generated, and then leave the regeneration of the seaweed beds to the natural healing power of the sea. In this case, the seaweed beds that are regenerated may not necessarily be suitable for the purpose of the area.
　本発明の目的は、藻場を所望の藻類の繁殖に適した藻場とすることが可能な、藻類の選択的な成長促進効果を示す薬剤を提供することである。 An object of the present invention is to provide a drug that exhibits a selective growth-promoting effect on algae and can make a seaweed bed suitable for the reproduction of desired algae.
　本発明は以下のとおりである。 The present invention is as follows.
　《態様１》希土類フェライトを含む、藻類の選択的成長促進剤。
　《態様２》前記希土類フェライトが、下記式（１）：
　　Ｌｎ２ｘＦｅ２（１－ｘ）Ｏ３　　　（１）
（式（１）中、Ｌｎは、ランタン、プラセオジム、ネオジム、及びイットリウムからなる群より選択される希土類元素であり、ｘは、０．５０以上１．００未満の数である。）
で表される組成を有する、態様１に記載の成長促進剤。
　《態様３》前記式（１）中のｘが０．６５以上０．８５以下の数である、態様２に記載の成長促進剤。
　《態様４》前記希土類フェライトがランタンフェライトである、態様１に記載の成長促進剤。
　《態様５》前記式（１）中のＬｎがランタンである、態様２に記載の成長促進剤。
　《態様６》態様１～５のいずれか一項に記載の成長促進剤、樹脂、及び溶媒を含む、藻類の選択的成長促進剤分散液。
　《態様７》塗料、インキ、又は処理液である、態様６に記載の成長促進剤分散液。
　《態様８》態様１～５のいずれか一項に記載の成長促進剤を含む塗膜を有する、藻類の選択的成長促進物品。
　《態様９》海苔網又は人口藻礁である、態様８に記載の成長促進物品。
　《態様１０》態様８に記載の成長促進物品を海中又は海底に設置することを含む、藻場の形成方法。 <Aspect 1> A selective growth promoter for algae containing a rare earth ferrite.
<Aspect 2> The rare earth ferrite has the following formula (1):
Ln 2x Fe 2 (1-x) O 3 (1)
(In formula (1), Ln is a rare earth element selected from the group consisting of lanthanum, praseodymium, neodymium, and yttrium, and x is a number of 0.50 or more and less than 1.00.)
The growth promoter according to aspect 1, having a composition represented by:
<Aspect 3> The growth promoter according to aspect 2, wherein x in the formula (1) is a number of 0.65 or more and 0.85 or less.
<Aspect 4> The growth promoter according to aspect 1, wherein the rare earth ferrite is lanthanum ferrite.
<Aspect 5> The growth promoter according to aspect 2, wherein Ln in the formula (1) is lanthanum.
<<Aspect 6>> A dispersion of a selective growth promoter for algae, comprising the growth promoter according to any one of Aspects 1 to 5, a resin, and a solvent.
<Aspect 7> The growth promoter dispersion according to aspect 6, which is a paint, ink, or treatment liquid.
<<Aspect 8>> An article for selective growth promotion of algae, comprising a coating film containing the growth promoter according to any one of Aspects 1 to 5.
<Aspect 9> The growth promoting article according to aspect 8, which is a seaweed net or an artificial algae reef.
<<Aspect 10>> A method for forming a seaweed bed, comprising installing the growth promoting article according to Aspect 8 in the sea or on the seabed.
　本発明の藻類の選択的成長促進剤は、紅藻の付着及び成長を抑制しつつ、緑藻の付着及び成長を促進する効果を有する。したがって、人工藻場に本発明の選択的成長促進剤を適用すると、所望の藻類の繁殖に適した藻場とすることが可能となる。 The algae selective growth promoter of the present invention has the effect of promoting the attachment and growth of green algae while suppressing the attachment and growth of red algae. Therefore, when the selective growth promoter of the present invention is applied to an artificial seaweed bed, it becomes possible to create a seaweed bed suitable for the reproduction of desired algae.
　《藻類の選択的成長促進剤》
　本発明の藻類の選択的成長促進剤は、希土類フェライトを含む。 《Selective growth promoter for algae》
The algae selective growth promoter of the present invention contains rare earth ferrite.
　希土類フェライトは、例えば下記式（１）：
　　Ｌｎ２ｘＦｅ２（１－ｘ）Ｏ３　　　（１）
（式（１）中、Ｌｎは、ランタン、プラセオジム、ネオジム、及びイットリウムからなる群より選択される希土類元素であり、ｘは、０．５０以上１．００未満の数である。）
で表される組成を有するものであってよい。 Rare earth ferrite, for example, has the following formula (1):
Ln 2x Fe 2 (1-x) O 3 (1)
(In formula (1), Ln is a rare earth element selected from the group consisting of lanthanum, praseodymium, neodymium, and yttrium, and x is a number of 0.50 or more and less than 1.00.)
It may have a composition represented by:
　上掲特許文献３では、下記式（１）で表される組成の希土類フェライトは、優れた防藻効果を示す防藻剤として機能すると説明されている。しかしながら、本発明者らは、この希土類フェライトは、紅藻の付着及び成長を抑制しつつ、緑藻の付着及び成長を促進する効果を有することを見出した。 In Patent Document 3 mentioned above, it is explained that the rare earth ferrite having the composition represented by the following formula (1) functions as an algaecide that exhibits an excellent algaecide effect. However, the present inventors have found that this rare earth ferrite has the effect of promoting the attachment and growth of green algae while suppressing the attachment and growth of red algae.
　本発明の希土類フェライトは、上記式（１）中のｘが、０．５０以上１．００未満の数である限り、どのような形態であってもよい。例えば、全体が均一な組成である固溶体を形成していてもよいし、ＬｎＦｅＯ３相とＬｎ２Ｏ３相との混合物であってもよいし、均一組成の固溶体とＬｎＦｅＯ３相とＬｎ２Ｏ３相との混合物であってもよいし、これら以外の相を含んでいてもよい。また、Ｌｎ２Ｏ３相の一部又は全部がＬｎ（ＯＨ）３に変換されていてもよく、このような態様も、本発明に包含される。 The rare earth ferrite of the present invention may be in any form as long as x in the above formula (1) is a number of 0.50 or more and less than 1.00. For example, a solid solution with a uniform composition may be formed, a mixture of three LnFeO phases and three Ln 2 O phases, or a solid solution with a uniform composition, three LnFeO phases, and Ln 2 O It may be a mixture with three phases or may contain phases other than these. Further, part or all of the Ln 2 O 3 phase may be converted to Ln(OH) 3 , and such an embodiment is also included in the present invention.
　式（１）中のｘは、０．５０以上であり、０．５５以上、０．６０以上、０．６５以上、０．７０以上、又は０．７５以上であってもよい。ｘは、１．００未満であり、０．９０以下、０．８５以下、０．８０以下、０．７５以下、０．７０以下、０．６５以下、又は０．６０以下であってもよい。 x in formula (1) is 0.50 or more, and may be 0.55 or more, 0.60 or more, 0.65 or more, 0.70 or more, or 0.75 or more. x is less than 1.00, and may be 0.90 or less, 0.85 or less, 0.80 or less, 0.75 or less, 0.70 or less, 0.65 or less, or 0.60 or less .
　上記式（１）中のｘは、典型的には、例えば、０．５０以上０．９０以下の数であってよく、更には、更には、０．６５以上０．８５以下であってよく、特には、０．７０以上０．８０以下の数であってよい。 Typically, x in the above formula (1) may be, for example, a number of 0.50 or more and 0.90 or less, and furthermore, may be 0.65 or more and 0.85 or less. In particular, it may be a number of 0.70 or more and 0.80 or less.
　式（１）中の希土類（Ｌｎ）は、紅藻の付着及び成長の抑制効果、及び緑藻の付着及び成長の促進効果、並びにコストの観点から、特に、ランタンであってよい。したがって本発明の藻類の選択的成長促進剤は、ランタンフェライト粒子であってよい。 The rare earth (Ln) in formula (1) may particularly be lanthanum, from the viewpoints of suppressing red algae adhesion and growth, promoting green algae adhesion and growth, and cost. The selective algal growth promoter of the present invention may therefore be lanthanum ferrite particles.
　本発明の選択的成長促進剤の粒径は、ハンドリング性の観点からは、大きい方が好適である。この観点からは、粒径は、例えば、０．５μｍ以上、１．０μｍ以上、３．０μｍ以上、５．０μｍ以上、又は１０μｍ以上であってよい。一方で、質量当たりの表面積を高めること、本発明の選択的成長促進剤を塗料として物品に塗布して用いるときの粒子の脱落を防止すること、等の観点からは、粒径は小さい方が好適である。この観点からは、粒径は、例えば、１５μｍ以下、１２μｍ以下、１０μｍ以下、又は８．０μｍ以下であってよい。 The particle size of the selective growth promoter of the present invention is preferably larger from the viewpoint of handling properties. From this point of view, the particle size may be, for example, 0.5 μm or more, 1.0 μm or more, 3.0 μm or more, 5.0 μm or more, or 10 μm or more. On the other hand, from the viewpoints of increasing the surface area per mass and preventing particles from falling off when applying the selective growth promoter of the present invention to articles as a paint, the smaller the particle size, the better. suitable. From this point of view, the particle size may be, for example, 15 μm or less, 12 μm or less, 10 μm or less, or 8.0 μm or less.
　《藻類の選択的成長促進剤の製造方法》
　本発明の選択的成長促進剤の製造方法は、特に限定されるものではない。 《Method for producing selective algae growth promoter》
The method for producing the selective growth promoter of the present invention is not particularly limited.
　しかし、本発明の選択的成長促進剤は、例えば、希土類源と鉄源とを所定の割合で含有する混合物に、適当な応力を印加して粉砕混合した後に、焼成することにより、行われてよい。所望により、焼成後に水処理を行ってもよい。 However, the selective growth promoter of the present invention can be produced by, for example, applying an appropriate stress to a mixture containing a rare earth source and an iron source in a predetermined ratio, pulverizing and mixing the mixture, and then firing the mixture. good. If desired, water treatment may be performed after firing.
　希土類源としては、例えば、所望の希土類元素の酸化物を使用してよい他、バストネサイト、モナザイト、ゼノタイム等を使用してよい。希土類元素としては、得られる希土類フェライト粒子の抗菌性、及びコストの観点から、ランタンを用いることが好ましい。中でも、Ｌａ２Ｏ３を用いれば、効果が高く、比較的コストが安価な選択的成長促進剤を製造することができる。 As the rare earth source, for example, oxides of desired rare earth elements may be used, as well as bastnaesite, monazite, xenotime, etc. As the rare earth element, it is preferable to use lanthanum from the viewpoint of antibacterial properties of the obtained rare earth ferrite particles and cost. Among them, if La 2 O 3 is used, it is possible to produce a selective growth promoter that is highly effective and relatively inexpensive.
　鉄源としては、ＦｅＯ、Ｆｅ３Ｏ４、Ｆｅ２Ｏ３等の酸化物；ＦｅＯＯＨ、フェリヒドライト、シュベルマンライト等のオキシ酸化物；Ｆｅ（ＯＨ）２、Ｆｅ（ＯＨ）３等の水酸化物；等を使用してよい。これらの中で、鉄源としてＦｅＯＯＨを用いれば、Ｆｅ２Ｏ３等と比較して反応性が高いため、低温での焼成が可能となり、また、Ｆｅ２Ｏ３等と比較して粒経の小さい選択的成長促進剤を製造することができる。 Iron sources include oxides such as FeO, Fe 3 O 4 and Fe 2 O 3 ; oxyoxides such as FeOOH, ferrihydrite and schubermannite; water such as Fe(OH) 2 and Fe(OH) 3 . oxide; etc. may be used. Among these, if FeOOH is used as an iron source, it has higher reactivity than Fe 2 O 3 etc., so it can be fired at a lower temperature, and the grain size is smaller compared to Fe 2 O 3 etc. Small selective growth promoters can be produced.
　希土類源と鉄源との使用割合は、所望の選択的成長促進剤についての式（１）中のｘの値に適合するように、適宜に定められてよい。 The ratio of the rare earth source and iron source may be determined as appropriate to match the value of x in formula (1) for the desired selective growth promoter.
　粉砕混合は、乾式粉砕であっても、湿式粉砕であってもよい。この粉砕において希土類源と鉄源との混合物に印加される応力は、例えば、摩擦力、せん断力、ずり応力、衝撃力等であってよい。 The pulverization and mixing may be dry pulverization or wet pulverization. The stress applied to the mixture of rare earth source and iron source during this pulverization may be, for example, friction force, shear force, shear stress, impact force, or the like.
　上述の応力を印加する方法としては、例えば、ボールミル中で湿式粉砕する方法等が挙げられる。粉砕を湿式粉砕にて実施する場合には、液状媒体として、例えば、水、アルコール等を使用してよい。希土類源と鉄源との混合物を湿式粉砕によって粉砕混合した後は、必要に応じて、加熱乾燥等の適宜の方法によって液状媒体が除去されてよい。 Examples of the method of applying the above-mentioned stress include a method of wet pulverization in a ball mill. When grinding is carried out by wet grinding, water, alcohol, etc. may be used as the liquid medium. After the mixture of the rare earth source and the iron source is pulverized and mixed by wet pulverization, the liquid medium may be removed by an appropriate method such as heating and drying, if necessary.
　焼成温度及び焼成時間は、特に限定されるものではなく、それぞれ、適宜に設定することができる。 The firing temperature and firing time are not particularly limited, and can be set as appropriate.
　焼成温度は、例えば、７００℃以上、８００℃以上、９００℃以上、又は１，０００℃以上、かつ、例えば、１，３００℃以下、１，２００℃以下、１，１００℃以下、又は１，０００℃以下の温度において、実施してよい。 The firing temperature is, for example, 700°C or higher, 800°C or higher, 900°C or higher, or 1,000°C or higher, and, for example, 1,300°C or lower, 1,200°C or lower, 1,100°C or lower, or 1, It may be carried out at temperatures below 000°C.
　焼成時間は、例えば、１時間以上、２時間以上、３時間以上、４時間以上、６時間以上、８時間以上、１２時間以上、又は１５時間以上、かつ、７２時間以下、４８時間以下、３６時間以下、２４時間以下、１８時間以下、又は１５時間以下の時間で、実施してよい。 The firing time is, for example, 1 hour or more, 2 hours or more, 3 hours or more, 4 hours or more, 6 hours or more, 8 hours or more, 12 hours or more, or 15 hours or more, and 72 hours or less, 48 hours or less, 36 hours or more. It may be carried out for less than 1 hour, 24 hours or less, 18 hours or less, or 15 hours or less.
　焼成時の周囲雰囲気は、酸化性雰囲気であってよく、例えば、空気中で焼成してよい。 The surrounding atmosphere during firing may be an oxidizing atmosphere, for example, firing may be performed in air.
　上記のようにして、希土類フェライトが得られる。この希土類フェライトを、そのまま本発明の選択的成長促進剤として用いてもよいし、希土類フェライトに水処理を施したうえで、本発明の選択的成長促進剤として用いてもよい。 Rare earth ferrite is obtained as described above. This rare earth ferrite may be used as the selective growth promoter of the present invention as it is, or the rare earth ferrite may be treated with water and then used as the selective growth promoter of the present invention.
　希土類フェライトの水処理は、希土類フェライトを水と接触させる適宜の方法によって行われてよい。例えば、以下の接触方法によってよい。
　　希土類フェライトに、液体の水を加えて接触させ、必要に応じて撹拌した後、接触後の水を除去する方法、
　　希土類フェライトに、水蒸気を供給して接触させる方法、等。 The rare earth ferrite may be treated with water by any suitable method of bringing the rare earth ferrite into contact with water. For example, the following contact method may be used.
A method of adding liquid water to rare earth ferrite and bringing it into contact, stirring if necessary, and then removing the water after contact,
A method of supplying and contacting rare earth ferrite with water vapor, etc.
　希土類フェライトと、液体の水との接触は、例えば、０℃以上、１０℃以上、又は２０℃以上、かつ、１００°以下、６０℃以下、又は４０℃以下の温度において行われてよい。この方法は、繰り返して行われてもよい。この場合、処理後の水の導電率が、精製水の導電率と同じになるまで、繰り返して行われてよい。 The rare earth ferrite may be brought into contact with liquid water at a temperature of, for example, 0° C. or higher, 10° C. or higher, or 20° C. or higher, and 100° or lower, 60° C. or lower, or 40° C. or lower. This method may be repeated. In this case, the treatment may be repeated until the conductivity of the treated water becomes the same as the conductivity of purified water.
　希土類フェライト物と、水蒸気との接触は、１００℃以上、１１０℃以上、又は１２０℃以上、かつ、２００°以下、１６０℃以下、又は１４０℃以下の温度において行われてよい。 The rare earth ferrite material may be brought into contact with water vapor at a temperature of 100°C or higher, 110°C or higher, or 120°C or higher, and 200°C or lower, 160°C or lower, or 140°C or lower.
　希土類フェライトの水処理において、液体の水との接触と、水蒸気との接触とを組み合わせて行ってもよい。 In the water treatment of rare earth ferrite, contact with liquid water and contact with water vapor may be performed in combination.
　水処理後、処理物を本発明の選択的成長促進剤として用いる前に、所望により、適宜の乾燥を行ってもよい。この乾燥は、例えば、１００℃以上、１１０℃以上、又は１２０℃以上、かつ、２００°以下、１６０℃以下、又は１４０℃以下の温度において、１時間以上、２時間以上、４時間以上、６時間以上、又は８時間以上、かつ、７２時間以下、４８時間以下、２４時間以下、又は１８時間以下の時間で、行われてよい。 After the water treatment, appropriate drying may be performed as desired before the treated product is used as the selective growth promoter of the present invention. This drying is carried out, for example, at a temperature of 100°C or higher, 110°C or higher, or 120°C or higher, and 200° or lower, 160°C or lower, or 140°C or lower for 1 hour or more, 2 hours or more, 4 hours or more, 6 hours or more. It may be carried out for a time of at least 8 hours, or at least 72 hours, at most 48 hours, at most 24 hours, or at most 18 hours.
　得られた選択的成長促進剤は、必要に応じて、粉砕して粒度を調製した後に、使用に供されてよい。 The obtained selective growth promoter may be used after being pulverized to adjust the particle size, if necessary.
　《藻類の選択的成長促進剤分散液》
　本発明の別の観点によると、藻類の選択的成長促進剤分散液が提供される。 《Selective growth promoter dispersion for algae》
According to another aspect of the invention, a selective algal growth promoter dispersion is provided.
　本発明の成長促進剤分散液は、本発明の成長促進剤、樹脂、及び溶媒を含み、更に分散剤を含んでいてよい。 The growth promoter dispersion of the present invention contains the growth promoter of the present invention, a resin, and a solvent, and may further contain a dispersant.
　本発明の成長促進剤分散液に含まれる成長促進剤は、本発明の成長促進剤であり、上記の説明をそのまま援用できる。 The growth promoter contained in the growth promoter dispersion of the present invention is the growth promoter of the present invention, and the above explanation can be used as is.
　本発明の成長促進剤分散液に含まれる樹脂は、物品の表面上に塗膜を形成し、成長促進剤の粒子を物品に固定するためのバインダーとして機能する。樹脂は、成長促進剤分散液の溶媒に溶解するか、又は分散性のよいものであってよい。 The resin contained in the growth promoter dispersion of the present invention forms a coating film on the surface of the article and functions as a binder for fixing the growth promoter particles to the article. The resin may be soluble or highly dispersible in the solvent of the growth promoter dispersion.
　樹脂は、例えば、アクリル樹脂、アクリルシリコーン樹脂、シリコーン樹脂、アミノアルキド樹脂、エポキシ樹脂、フェノール樹脂、ポリウレタン樹脂、不飽和ポリエステル樹脂、フッ素樹脂等から選択されてよい。 The resin may be selected from, for example, acrylic resin, acrylic silicone resin, silicone resin, aminoalkyd resin, epoxy resin, phenol resin, polyurethane resin, unsaturated polyester resin, fluororesin, and the like.
　分散剤は、例えば、アクリル酸系、カルボン酸系、スルホン酸系、アンモニウム塩系等の公知の分散剤から適宜に選択されてよい。分散剤として、具体的には、特に、アクリル系共重合体のアンモニウム塩、酸基を有する共重合体のアルキロールアンモニウム塩であってよい。 The dispersant may be appropriately selected from known dispersants such as acrylic acid-based, carboxylic acid-based, sulfonic acid-based, and ammonium salt-based dispersants. Specifically, the dispersant may be an ammonium salt of an acrylic copolymer or an alkylolammonium salt of a copolymer having an acid group.
　溶媒は、例えば、水、アルコール、エステル、ケトン、エーテル、芳香族炭化水素等から選択される１種又は２種以上であってよい。 The solvent may be one or more selected from, for example, water, alcohol, ester, ketone, ether, aromatic hydrocarbon, and the like.
　本発明の成長促進剤分散液における成長促進剤の含有量は、選択的成長促進機能と塗膜形成性とのバランスをとる観点から、成長促進剤分散液の総固形分含量を１００質量％としたときに、５質量％以上、１０質量％以上、１５質量％以上、２０質量％以上、又は２５質量％以上であってよく、６０質量％以下、５５質量％以下、５０質量％以下、４５質量％以下、又は４０質量％以下であってよい。 The content of the growth promoter in the growth promoter dispersion of the present invention is set such that the total solid content of the growth promoter dispersion is 100% by mass from the viewpoint of balancing selective growth promoting function and film forming properties. 5% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, or 25% by mass or more, and 60% by mass or less, 55% by mass or less, 50% by mass or less, 45% by mass or less. It may be less than 40% by mass, or less than 40% by mass.
　本発明の成長促進剤分散液において、成長促進剤及び樹脂の合計質量に対する希土類フェライト粒子の割合は、選択的成長促進機能と、塗膜への成長促進剤の良好な固着性とのバランスをとる観点から、１０質量％以上、１２質量％以上、１５質量％以上、１８質量％以上、又は２０質量％以上であってよく、５０質量％以下、４５質量％以下、４０質量％以下、又は３５質量％以下であってよい。 In the growth promoter dispersion of the present invention, the ratio of rare earth ferrite particles to the total mass of the growth promoter and resin balances the selective growth promoting function and good adhesion of the growth promoter to the coating film. From the point of view, it may be 10% by weight or more, 12% by weight or more, 15% by weight or more, 18% by weight or more, or 20% by weight or more, and 50% by weight or less, 45% by weight or less, 40% by weight or less, or 35% by weight or less. It may be less than % by mass.
　本発明の成長促進剤分散液は、例えば、適宜の物品に塗布されることにより、藻類の選択的成長促進物品を形成し得る。したがって、成長促進剤分散液は、例えば、塗料、インキ、処理液等の形態であってよい。 The growth promoter dispersion of the present invention can be applied to an appropriate article to form an article for selectively promoting the growth of algae, for example. Thus, the growth promoter dispersion may be in the form of a paint, ink, treatment liquid, etc., for example.
　《藻類の選択的成長促進物品》
　本発明の更に別の観点によると、藻類の選択的成長促進物品が提供される。 《Articles for selective growth promotion of algae》
According to yet another aspect of the invention, an article for selectively promoting the growth of algae is provided.
　本発明の成長促進物品は、成長促進剤を含む塗膜を有する物品である。この塗膜は、任意の物品の表面上の少なくとも一部に形成されていてよい。 The growth promoting article of the present invention is an article having a coating film containing a growth promoting agent. This coating film may be formed on at least a portion of the surface of any article.
　本発明の成長促進物品における塗膜は、本発明の成長促進剤の他に、樹脂、分散剤等を含んでいてよい。これらの樹脂及び分散剤は、それぞれ、本発明の成長促進剤分散液に含まれる樹脂及び分散剤から、適宜に選択されてよい。本発明成長促進物品の塗膜における、成長促進剤、樹脂、及び分散剤の使用割合も、本発明の成長促進剤分散液における使用割合と同様であってよい。 The coating film in the growth promoting article of the present invention may contain a resin, a dispersant, etc. in addition to the growth promoting agent of the present invention. These resins and dispersants may be appropriately selected from the resins and dispersants contained in the growth promoter dispersion of the present invention. The proportions of the growth promoter, resin, and dispersant used in the coating film of the growth promoting article of the present invention may also be the same as the proportions used in the growth promoter dispersion of the present invention.
　本発明の成長促進物品は、例えば、海苔網、人工藻礁等であってよい。 The growth promoting article of the present invention may be, for example, a seaweed net, an artificial algae reef, etc.
　《藻場の形成方法》
　本発明の更に別の観点によると、藻場の形成方法が提供される。 《How to form a seaweed bed》
According to yet another aspect of the present invention, a method for forming a seaweed bed is provided.
　本発明の藻場の形成方法は、本発明の成長促進物品を海中又は海底に設置することを含む方法である。海中又は海底は、藻場の形成が所望される海中又は海底であってよい。 The method of forming a seaweed bed of the present invention is a method that includes installing the growth promoting article of the present invention in the sea or on the seabed. The seawater or seabed may be the seawater or seabed where formation of a seaweed bed is desired.
　本発明の藻場の形成方法によると、紅藻の付着及び成長を抑制しつつ、緑藻の付着及び成長が促進されて、所望の藻類の繁殖に適した藻場が形成される。なお、ここでいう「形成」は「再生」を含む概念である。 According to the seaweed bed forming method of the present invention, the adhesion and growth of green algae is promoted while the adhesion and growth of red algae is suppressed, and a seaweed bed suitable for the reproduction of desired algae is formed. Note that "formation" here is a concept that includes "regeneration."
　《実施例１》
　（１）成長促進剤の合成
　粉砕メディアとして１０ｍｍΦのアルミナ球を使用するボールミル中に、０．４モル部のＬａ２Ｏ３及び０．２モル部のＦｅＯＯＨ（Ｌａ：Ｆｅ＝８０：２０（モル比））、並びに水を仕込み、５時間粉砕混合した。得られた粉砕物を、３００℃にて１５時間乾燥した後、回転式粗砕機で解砕した。得られた解砕物を、１，０００℃にて１５時間焼成した後、ハンマーミルで解砕して解砕物を得た。 《Example 1》
(1) Synthesis of growth promoter 0.4 mol parts of La 2 O 3 and 0.2 mol parts of FeOOH (La:Fe=80:20 (mol. (ratio)) and water were added and pulverized and mixed for 5 hours. The obtained pulverized product was dried at 300° C. for 15 hours and then crushed using a rotary crusher. The obtained crushed material was fired at 1,000° C. for 15 hours, and then crushed with a hammer mill to obtain a crushed material.
　次いで、解砕物の水処理を行った。この水処理では、得られた解砕物を洗浄タンク内に投入し、精製水を投入して撹拌後、処理後の水をろ過により除去し、次いで新たな精製水を加えて撹拌及びろ過を繰り返す方法により行った。そして、処理後の水と精製水とが同じ導電率となった時点を水処理の終点とした。 Next, the crushed material was treated with water. In this water treatment, the obtained crushed material is put into a washing tank, purified water is added and stirred, the treated water is removed by filtration, and then new purified water is added and stirring and filtration are repeated. It was carried out by the method. The end point of the water treatment was defined as the point in time when the treated water and the purified water had the same conductivity.
　水処理後の解砕物を、１３０℃にて１５時間乾燥した後、再度ハンマーミルで解砕することにより、実施例１の成長促進剤を得た。 The growth promoter of Example 1 was obtained by drying the crushed product after water treatment at 130°C for 15 hours and crushing it again with a hammer mill.
　（２）試験用塗料の調製
　バッセル化学（株）製の薬剤フリーシリコーン塗料、品名「ＳＳガード」に、上記で合成した成長促進剤を、塗膜中の成長促進剤濃度が３０質量％となるように添加し、更に、キシレンを加えて塗料固形分が４５重量％となるように希釈して、よく撹拌することにより、試験用塗料を調製した。 (2) Preparation of test paint The growth promoter synthesized above was added to the drug-free silicone paint manufactured by Bassel Chemical Co., Ltd. under the product name "SS Guard" so that the concentration of the growth promoter in the paint film was 30% by mass. A test paint was prepared by adding xylene to dilute the solid content of the paint to 45% by weight and stirring thoroughly.
　（３）試験網の作製
　市販のポリエチレン製の海苔網を、上記で調製した試験用塗料に浸漬した後、常温にて１日（２４時間）静置して乾燥することにより、試験網を作製した。 (3) Preparation of test net A test net was prepared by dipping a commercially available polyethylene seaweed net into the test paint prepared above and then leaving it to dry at room temperature for one day (24 hours). did.
　（４）藻類成長試験
　試験網を、鹿児島県沖合の潮流が穏やかな海中に設置し、設置後２６日目、６４日目、１１５日目、及び１５３日目に、それぞれ、緑藻及び紅藻の付着状況を調べた。この試験は、１１月末から翌年の４月初めにかけて行った。藻類の付着状況は、試験網の面積を１００％とした場合の各藻の付着面積で表した。結果を表１に示す。 (4) Algae growth test Test nets were set up in the sea with calm currents off the coast of Kagoshima Prefecture, and on the 26th, 64th, 115th, and 153rd days after installation, green algae and red algae were tested. The adhesion status was investigated. This test was conducted from the end of November to the beginning of April of the following year. The adhesion status of algae was expressed as the adhesion area of each algae, taking the area of the test net as 100%. The results are shown in Table 1.
　《比較例１》
　成長促進剤を添加しないシリコーン塗料「ＳＳガード」をそのまま試験用塗料とした他は、実施例１と同様にして試験網を作製し、藻類成長試験を行った。結果を表１に示す。 《Comparative example 1》
A test net was prepared in the same manner as in Example 1, except that the silicone paint "SS Guard" without the addition of a growth promoter was used as the test paint, and an algae growth test was conducted. The results are shown in Table 1.
　《比較例２》
　試験用塗料を塗布しない海苔網をそのまま試験網として、実施例１と同様に藻類成長試験を行った。結果を表１に示す。 《Comparative example 2》
An algae growth test was conducted in the same manner as in Example 1 using the seaweed net without applying the test paint as the test net. The results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示した結果から、以下のことが理解される。 From the results shown in Table 1, the following can be understood.
　塗料を塗布していない比較例２の海苔網では、試験網設置６４日目までは、緑藻の付着よりも紅藻の付着の方がやや優先する程度であったが、その後、紅藻が緑藻を駆逐し、１５３日目には試験網面積の９５％に紅藻が付着している状態となった。また、シリコーン塗料のみを塗布した比較例１の試験網は、緑藻及び紅藻双方に対する付着防止効果が見られたが、特定の藻に対する成長促進効果は見られなかった。 In the seaweed net of Comparative Example 2, which was not coated with paint, adhesion of red algae was slightly more preferential than adhesion of green algae until the 64th day of installation of the test net; On the 153rd day, 95% of the test net area was covered with red algae. Further, the test net of Comparative Example 1 coated with only silicone paint showed an effect of preventing adhesion to both green algae and red algae, but no growth promoting effect on specific algae was observed.
　これらに対して、本発明の成長促進剤を含むシリコーン塗料を塗布した実施例１の試験網は、紅藻に対する付着防止効果とともに、緑藻に対する成長促進効果を示すことが確認された。 On the other hand, it was confirmed that the test net of Example 1 coated with the silicone paint containing the growth promoter of the present invention exhibited an effect of preventing adhesion to red algae and an effect of promoting the growth of green algae.

Claims (10)

  1. 　希土類フェライトを含む、藻類の選択的成長促進剤。 A selective growth promoter for algae containing rare earth ferrite.
  2. 　前記希土類フェライトが、下記式（１）：
    　　Ｌｎ２ｘＦｅ２（１－ｘ）Ｏ３　　　（１）
    （式（１）中、Ｌｎは、ランタン、プラセオジム、ネオジム、及びイットリウムからなる群より選択される希土類元素であり、ｘは、０．５０以上１．００未満の数である。）
    で表される組成を有する、請求項１に記載の成長促進剤。     The rare earth ferrite has the following formula (1):
    Ln 2x Fe 2 (1-x) O 3 (1)
    (In formula (1), Ln is a rare earth element selected from the group consisting of lanthanum, praseodymium, neodymium, and yttrium, and x is a number of 0.50 or more and less than 1.00.)
    The growth promoter according to claim 1, having a composition represented by:
  3. 　前記式（１）中のｘが０．６５以上０．８５以下の数である、請求項２に記載の成長促進剤。 The growth promoter according to claim 2, wherein x in the formula (1) is a number from 0.65 to 0.85.
  4. 　前記希土類フェライトがランタンフェライトである、請求項１に記載の成長促進剤。 The growth promoter according to claim 1, wherein the rare earth ferrite is lanthanum ferrite.
  5. 　前記式（１）中のＬｎがランタンである、請求項２に記載の成長促進剤。 The growth promoter according to claim 2, wherein Ln in the formula (1) is lanthanum.
  6. 　請求項１～５のいずれか一項に記載の成長促進剤、樹脂、及び溶媒を含む、藻類の選択的成長促進剤分散液。 A dispersion of a selective growth promoter for algae, comprising the growth promoter according to any one of claims 1 to 5, a resin, and a solvent.
  7. 　塗料、インキ、又は処理液である、請求項６に記載の成長促進剤分散液。 The growth promoter dispersion according to claim 6, which is a paint, ink, or treatment liquid.
  8. 　請求項１～５のいずれか一項に記載の成長促進剤を含む塗膜を有する、藻類の選択的成長促進物品。 An article for selectively promoting the growth of algae, comprising a coating film containing the growth promoter according to any one of claims 1 to 5.
  9. 　海苔網又は人工藻礁である、請求項８に記載の成長促進物品。 The growth promoting article according to claim 8, which is a seaweed net or an artificial algae reef.
  10. 　請求項８に記載の成長促進物品を海中又は海底に設置することを含む、藻場の形成方法。 A method for forming a seaweed bed, comprising installing the growth promoting article according to claim 8 in the sea or on the seabed.
PCT/JP2023/029579 2022-08-17 2023-08-16 Selective growth promoter for algae WO2024038869A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6420040A (en) * 1987-07-14 1989-01-24 Akira Yasue Fiber material for organism
JPH02152914A (en) * 1988-12-02 1990-06-12 Hokuriku Jisho:Kk Sea weed-proliferation powder and its use
JP2017147995A (en) * 2016-02-25 2017-08-31 沖縄県 Culture method of caulerpaceae caulerpa green algae
JP2018070781A (en) * 2016-10-31 2018-05-10 国立大学法人徳島大学 Coating composition for plant growth control
WO2021193644A1 (en) * 2020-03-24 2021-09-30 共同印刷株式会社 Anti-algal agent

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6420040A (en) * 1987-07-14 1989-01-24 Akira Yasue Fiber material for organism
JPH02152914A (en) * 1988-12-02 1990-06-12 Hokuriku Jisho:Kk Sea weed-proliferation powder and its use
JP2017147995A (en) * 2016-02-25 2017-08-31 沖縄県 Culture method of caulerpaceae caulerpa green algae
JP2018070781A (en) * 2016-10-31 2018-05-10 国立大学法人徳島大学 Coating composition for plant growth control
WO2021193644A1 (en) * 2020-03-24 2021-09-30 共同印刷株式会社 Anti-algal agent

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