JP4806769B2 - Antifouling resin, method for producing the same, and antifouling paint - Google Patents

Description

  The present invention relates to an antifouling resin, a method for producing the same, and an antifouling paint, and particularly, is excellent in antifouling property, has little influence on the environment, and can be produced in a simple process in an aqueous system and its The present invention relates to a manufacturing method and an antifouling paint.

  Underwater structures such as ships, marine structures, aquaculture fishing nets, buoys, industrial water systems, etc. are constantly exposed to the water inhabited by marine organisms, so microorganisms such as bacteria adhere over time, Furthermore, marine adhering organisms (for example, animals and plants such as barnacles, mussels, seaweeds, diatoms, etc.) are attached using this as a scaffold.

  When the surface of an underwater structure is covered with these microorganisms, animals and plants, various problems are caused. For example, when the ship's bottom is covered with the above-mentioned organisms, seawater friction resistance increases, and extra energy is required to drive the ship, so the efficiency of the ship's fuel decreases. In the case of fishing nets, clogging occurs, resulting in massive death of seafood. Furthermore, in the case of a buoy, it sinks. In addition, there may be a problem that the covered surface portion is corroded or the work of fishermen is reduced.

  In addition, in industrial water systems that use natural water such as river water and lake water as cooling water, and in circulation cooling devices that use water supply in the middle and water, bacteria, diatoms, cyanobacteria, etc. contained in the water propagate. It causes troubles such as a decrease in cooling efficiency due to adhering to the vessel wall, blockage of water pipes, and a decrease in flow rate.

  As a method for preventing such adhesion of microorganisms and organisms, a method of applying an antifouling paint on the surface of an underwater structure has been conventionally used.

  For example, in recent years, hydrolyzable antifouling paints containing a trialkyltin-containing polymer as an antifouling component have been used. This function is exhibited by the hydrolysis of the trialkyltin-containing polymer in a slightly alkaline atmosphere in water to elute the organotin compound.

  Furthermore, Patent Document 1 discloses an underwater organism adhesion preventing coating composition using a phenol derivative having an alkyl group introduced therein. Such a phenol derivative having an alkyl group is known to have a considerably high effect, but the danger of environmental hormones has been pointed out.

  In addition, blending a resin composition obtained by mixing two or more kinds of resins as an antifouling substance has been studied (for example, Patent Document 2).

  On the other hand, as a method of mixing two types of resins, a semi-IPN type complex has been studied. The semi-IPN type composite is a composite having a mutual network intrusion structure as a network polymer and a linear polymer are entangled with each other. Such a semi-IPN type composite has a mutual network intrusion structure, so that a resin physical property that cannot be obtained by a simple mechanical blend of two kinds of resins can be obtained.

  Examples of the semi-IPN type composite include those made of a radical polymerization type polymer such as a network silicone resin and a linear vinyl polymer.

  In recent years, in view of the environmental impact of toxic substances such as organotin compounds, terminal silanol group-containing polysiloxanes and trialkoxysilanes containing ammonium salt structures were polymerized as antifouling substances that do not use these compounds. A semi-IPN type antifouling resin of a silicone resin and a radical polymer has been developed (for example, Patent Document 4).

Furthermore, a technique for preventing adhesion of attached organisms by using a crosslinked polymer hydrogel is also disclosed (for example, Patent Document 5).
Japanese Patent Laid-Open No. 3-128302 Japanese Patent Laid-Open No. 9-279061 “Study on Fisheries”, 1992, Vol. 11, No. 4, p. 71-72 Japanese Patent Laying-Open No. 2005-068191 JP 2005-34770 A

  Hydrolyzable antifouling paints containing trialkyltin-containing polymers as antifouling components can be prevented by leaching highly toxic antifouling agents and killing harmful aquatic organisms or even causing damage to non-adherent conditions. Since it exhibits soiling performance, it releases compounds harmful to the living body into the sea, which is a serious problem from the viewpoint of environmental pollution.

  Moreover, when the phenol derivative which introduce | transduced the alkyl group of patent document 1 is used, it is difficult to maintain an antifouling effect for a long period of time, and the device of using together the compound which has water repellency was required.

  Furthermore, there is a problem that a sufficient antifouling property cannot be obtained with a resin in which antifouling substances are mechanically blended like the resin component of Patent Document 2.

  Moreover, since the antifouling resin described in Patent Document 4 uses an organic solvent during production, there is a problem that it is difficult to produce in an aqueous system, and a radical polymerizable monomer is required for polymerization. There is a problem that the manufacturing process is complicated.

  The present invention has been made in view of the above-described conventional problems, and has an object of having an antifouling resin having high antifouling activity and low toxicity, which can be produced in a simple process in an aqueous system, And to provide antifouling paints.

  As a result of intensive studies, the present inventors have found that a resin containing a structure obtained by crosslinking polyvinyl alcohol (hereinafter abbreviated as “PVA”) with an alkoxysilane has a high antifouling property while maintaining high surface free energy. The present inventors have found that it is a high resin and can be produced by a simple process in an aqueous system, and has completed the present invention.

  That is, the antifouling resin according to the present invention is characterized by including a structure in which polyvinyl alcohol is crosslinked with alkoxysilane in order to solve the above-mentioned problems.

  According to the said structure, since antifouling resin has the high surface free energy derived from polyvinyl alcohol, it has high biofouling repellent activity. Moreover, it can also have a biofouling repellent activity expressed by crosslinking polyvinyl alcohol with alkoxysilane or an antibacterial property derived from alkoxysilane. Accordingly, synergistic biofouling repellent activity that cannot be obtained with polyvinyl alcohol or alkoxysilane alone can be obtained.

In addition, the antifouling resin according to the present invention is the above alkoxysilane,
General formula (1);

(Wherein R ₁ , R ₂ , R ₃ and R ₄ each independently represents an alkyl group), and / or
General formula (2);

(Wherein R ₅ , R ₆ , and R ₇ each independently represents an alkyl group. N represents a positive integer) and is a trialkoxysilane containing an isothiouronium structure. preferable.

  The antifouling resin includes a structure in which a linear polymer PVA is cross-linked with a cross-linkable silicone resin such as tetraalkoxysilane, and retains high surface free energy derived from PVA. It's easy to do. Therefore, it is possible to create a condition that is poor for the living organism and to effectively inhibit the attachment of the living organism.

  Here, although PVA itself and tetraalkoxysilane itself do not have high biofouling repellent activity, high biofouling repellent activity is expressed by crosslinking PVA with tetraalkoxysilane. Further, trialkoxysilanes containing an isothiouronium structure have antibacterial action and biological adhesion repellent activity. Therefore, the antifouling resin can obtain a synergistic biofouling repellent activity that cannot be obtained with PVA or alkoxysilane alone.

  Therefore, if the antifouling resin of the present invention is applied to the one used in the ocean, it prevents the attachment of marine organisms by preventing the adhesion of microorganisms, and also prevents the adhesion of marine organisms by the adhesion repellent activity. Antifouling effect for the period can be expected. Moreover, if it is used as a material for daily use, it effectively functions as an antibacterial material.

The substituents represented by R _{1 to} R ₇ in the above chemical formula may be the same or different, and some of them may be the same. And some of them may represent different substituents.

  Moreover, if tetraethoxysilane is used as the tetraalkoxysilane, good bioadhesion repellent activity can be imparted.

  Moreover, when N- (trimethoxysilylpropyl) isothiouronium chloride is used as the trialkoxysilane containing the isothiouronium structure, good biofouling repellent activity and antibacterial properties can be imparted.

  The method for producing an antifouling resin according to the present invention includes a step of crosslinking polyvinyl alcohol with an alkoxysilane.

  According to the said structure, since PVA is bridge | crosslinked with an alkoxysilane only by making it react under a catalyst by water type | system | group, the antifouling resin which has the high adhesion repellent activity of a living organism | raw_food can be manufactured easily. Therefore, an antifouling resin having a high biofouling prevention effect can be obtained inexpensively and easily.

In the method for producing an antifouling resin according to the present invention, the alkoxysilane is
General formula (1);

(Wherein R ₁ , R ₂ , R ₃ and R ₄ each independently represents an alkyl group) and / or tetraalkoxysilane represented by
General formula (2);

(Wherein R ₅ , R ₆ , and R ₇ each independently represents an alkyl group. N represents a positive integer) and is a trialkoxysilane containing an isothiouronium structure. preferable.

  According to the above configuration, since PVA is crosslinked with a cross-linked silicone resin such as tetraalkoxysilane simply by reacting in an aqueous system under a catalyst, an antifouling resin having high biofouling repellent activity can be easily produced. Can do. Therefore, it is possible to easily and inexpensively obtain an antifouling resin having a high effect of preventing the adhesion of organisms.

  Moreover, since PVA which is a raw material is very inexpensive, an antifouling resin having a high effect of preventing the adhesion of organisms can be produced at low cost also from this point. Furthermore, since PVA is easily soluble in water, the production method according to the present invention does not require an organic solvent. Therefore, the load on the environment can be reduced.

  Further, in the production method according to the present invention, PVA is crosslinked by simply dissolving PVA in water, adding a crosslinked silicone resin such as tetraalkoxysilane to the aqueous solution, and heating in the presence of a catalyst. Therefore, it is not necessary to use a radical polymerization agent as in the technique described in Patent Document 4 above. Therefore, a high-performance antifouling resin can be produced very easily.

  In the production method according to the present invention, the tetraalkoxysilane is preferably tetraethoxysilane. Since tetraethoxysilane has good biorepellency, it is possible to produce an antifouling resin having a higher biofouling prevention effect.

  In the production method according to the present invention, the trialkoxysilane containing the isothiouronium structure is preferably N- (trimethoxysilylpropyl) isothiouronium chloride. Since N- (trimethoxysilylpropyl) isothiouronium chloride has both excellent biorepellency and antibacterial properties, it is possible to produce an antifouling resin having a higher effect of preventing the adhesion of organisms.

  In addition, since the antifouling paint of the present invention contains the antifouling resin, it has antibacterial properties and biological repellent properties, is excellent in preservability, and is easy to use.

  As described above, the antifouling resin of the present invention includes a structure in which polyvinyl alcohol is crosslinked with alkoxysilane. According to this, since the antifouling resin retains high surface free energy and has an effective biofouling repellent activity, antifouling of antibacterial materials or resins that prevent the attachment of microorganisms and organisms in the ocean It is effective as a functional resin.

  Moreover, the manufacturing method of the antifouling resin of this invention includes the process of bridge | crosslinking polyvinyl alcohol with an alkoxysilane. According to this, an antifouling resin having a high surface free energy and a high effect of preventing the adhesion of living organisms can be produced inexpensively and easily in an aqueous system.

  The present invention is effective in preventing microorganisms such as bacteria from adhering to the marine structure, and further preventing organisms adhering to the marine structure (for example, animals such as barnacles, mussels, Aosa and diatoms) from attaching. Provide dirty resin.

  FIG. 1 is a reaction schematic diagram showing that the antifouling resin according to the present invention is obtained by crosslinking PVA with alkoxysilane. As shown in FIG. 1, the inventors cross-link linear PVA with an alkoxysilane such as tetraethoxysilane (hereinafter referred to as “TEOS”), thereby having high surface free energy, It has been found that an antifouling resin having a high adhesion preventing effect can be obtained.

  Since the antifouling resin according to the present invention has high surface free energy derived from PVA, it has high biofouling repellent activity. Moreover, the bioadhesion repellent activity expressed by bridge | crosslinking PVA with an alkoxysilane, or the antimicrobial property derived from an alkoxysilane can be combined. Therefore, a long-term antifouling effect can be expected.

  As the PVA, a commercially available product can be used, and the degree of polymerization is not particularly limited. Further, the degree of saponification of PVA is not particularly limited. It may be a saponified type. However, PVA generally has higher water solubility as the molecular weight is smaller, and water solubility is higher as the saponification degree is lower. Therefore, if the degree of polymerization is too low, it may be eluted in water. Therefore, from the viewpoint of preventing the antifouling resin from eluting and maintaining the antifouling effect for a long period of time, the degree of polymerization is preferably 500 or more, more preferably 1500 or more, and particularly preferably 2000 or more. preferable. The saponification degree is preferably a complete saponification type. In addition, the said polymerization degree means the number of vinyl alcohol residues which comprise PVA here.

  The antifouling resin of the present invention exhibits high adhesion repellent activity by utilizing the high surface free energy of PVA. PVA containing many hydroxyl groups takes up water in water and swells. And this specific surface structure is considered to create conditions that are poor for scaffolding organisms. In addition, PVA is one of the general-purpose polymers currently on the market and is a very inexpensive material, which can contribute to the production of the antifouling resin according to the present invention at a low cost. Furthermore, PVA is a biodegradable polymer and has a low environmental burden and a low toxicity to the human body. Therefore, the toxicity of the antifouling resin according to the present invention is very low and does not adversely affect the environment like an organotin compound.

  FIG. 2 is a graph showing the relationship between the surface free energy of the paint and the degree of biofouling. As shown in FIG. 2, there is generally a low peak of biofouling in a region where the surface free energy is moderate, and the degree of fouling increases as the surface free energy increases. The degree of fouling is said to decrease (Baier, RE Bull. NY Acad. Med., 1970). Since the antifouling resin according to the present invention has a structure in which PVA is cross-linked, it has high surface free energy and a low degree of biofouling. In other words, the organism has a high adhesion repellent activity.

  The alkoxysilane only needs to have at least two alkoxyl groups in one molecule in order to crosslink PVA. If the alkoxysilane has two or more alkoxyl groups, it becomes possible to crosslink between the hydroxyl groups of PVA as shown in FIG.

  Although it does not specifically limit as a kind of alkoxysilane, General formula (1);

(Wherein R ₁ , R ₂ , R ₃ and R ₄ each independently represents an alkyl group), the tetraalkoxysilane represented by PVA has a high PVA by forming a crosslinked polymer with PVA. Since the biofouling repellent activity derived from the surface free energy can be further increased, it can be particularly preferably used. The alkyl group in the general formula (1) is not particularly limited, but TEOS in which R ₁ , R ₂ , R ₃ and R ₄ are all ethyl groups is most preferable. TEOS is also preferably used because it is non-toxic and has little influence on the environment.

  Moreover, general formula (2);

(Wherein R ₅ , R ₆ and R ₇ each independently represents an alkyl group. N represents a positive integer), the trialkoxysilane containing an isothiouronium structure is itself Is preferably used because it has antibacterial properties and can further improve the antifouling property of the resin. The alkyl group is not particularly limited, but N- (trimethoxysilylpropyl) isothiouronium chloride (hereinafter abbreviated as “TSPIC”) is particularly preferably used.

As other alkoxysilanes, for example,
General formula (3)

(Wherein R ₈ , R ₉ , R ₁₀ , R ₁₁ , R ₁₂ each independently represents an alkyl group, n represents a positive integer), and a trialkoxy having an ammonium salt structure Silane can be suitably used. A trialkoxysilane containing an ammonium salt structure is also preferable because it itself has antibacterial properties and can further improve the antifouling property of the resin. Although the alkyl group is not particularly limited, octadecyldimethyl (3-trimethoxysilylpropyl) ammonium chloride (OTAC) can be particularly preferably used as a trialkoxysilane containing an ammonium salt structure.

  The cross-linking may be performed using one type of alkoxysilane or a plurality of types of alkoxysilane. In addition, the antifouling resin according to the present invention only needs to include a structure in which PVA is crosslinked with alkoxysilane. In other words, a part of vinyl alcohol residue contained in PVA should just be bridge | crosslinked. As shown in Examples described later, the preferred amount of alkoxysilane used varies depending on the type of alkoxysilane.

  As described above, the antifouling resin according to the present invention is a cross-linked body including a structure in which PVA is cross-linked with alkoxysilane. By forming the cross-linked body, PVA forms micelles with alkoxysilane. It is thought that it is held in the micelle. Therefore, the antifouling resin according to the present invention can be stably stored for a long period of time, and can exhibit the antifouling characteristic for a long period of time.

  As a manufacturing method of the said antifouling resin, what is necessary is just to include the process of bridge | crosslinking polyvinyl alcohol with an alkoxysilane. The catalyst used for the crosslinking reaction is not particularly limited, and may be a homogeneous catalyst or a heterogeneous catalyst. As the homogeneous catalyst, hydrochloric acid, sulfuric acid, nitric acid, sodium hydroxide, ammonia and the like can be used. Also, colloidal catalysts such as metal fine particles, enzymes, complex catalysts that are metal coordination compounds, organic catalysts, and the like may be used.

  Since PVA has solubility in water, the above production method can be carried out in an aqueous system, and it is not necessary to use an organic solvent. Therefore, the antifouling resin can be produced simply and safely. Moreover, it is only necessary to carry out the crosslinking reaction in the presence of a catalyst, and since no radical polymerization agent is required, the reaction can be carried out easily.

  In the antifouling paint of the present invention, the antifouling resin is preferably blended within a range of a lower limit of 0.1% by weight and an upper limit of 99.9% by weight. If it is less than the above lower limit, sufficient antifouling properties cannot be exhibited, and if it exceeds the above upper limit, it becomes highly viscous and the coating workability is lowered.

  The antifouling paint of the present invention may contain other resins in addition to the antifouling resin. The other resin is not particularly limited. For example, polyester resin, chlorinated rubber, chlorinated polypropylene resin, styrene-butadiene resin, epoxy resin, polyamide resin, petroleum resin, wax, paraffin, rosin ester, Examples thereof include rosin resins. These may be used alone or in combination of two or more.

  The antifouling paint of the present invention may further contain conventional additives such as an antifouling agent, a plasticizer, a pigment, and a solvent as long as the performance of the paint is not impaired. The antifouling agent is not particularly limited, and a known one, for example, an inorganic compound, an organic compound containing a metal, an organic compound containing no metal, or the like may be used. Specifically, cuprous oxide, Manganese ethylene bisdithiocarbonate, zinc dimethylcarbamate, 2-methylthio-4-t-butylamino-6-cyclopropylamino-s-triazine, 2,4,6-tetrachloro Isophthalonitrile, N, N-dimethyldichlorophenylurea, zinc ethylenebisdithiocarbamate, rhodan copper, 4,5-dichloro-2-n-octyl-3 (2H) isothiazolone, N- (fluorodichloromethylthio) sulfamide, 2 -Pyridinethiol-1-oxide zinc salt and copper salt, tetramethylthiuram disulfide, 2,4,6-trichlorophenylmaleimide, 2,3,5,6-tetrachloro-4- (methylsulfonyl) pyridine, 3- Iodo-2-propylbutylcarbamate, jodomethyl Ratorisuruhon, phenyl (bispyridyl) bismuth dichloride, 2- (4-thiazolyl) - benzimidazole, triphenylboron pyridine salt, stearylamine - triphenylboron, laurylamine - can be exemplified triphenyl boron, and the like. These antifouling agents may be used alone or in combination of two or more.

  Examples of the plasticizer include phthalate ester plasticizers such as dioctyl phthalate, dimethyl phthalate, and dicyclohexyl phthalate; aliphatic dibasic ester plasticizers such as isobutyl adipate and dibutyl sebacate; diethylene glycol dibenzoate, pentaerythritol Glycol ester plasticizers such as alkyl esters; Phosphate ester plasticizers such as tricrine diphosphoric acid and trichloroethyl phosphoric acid; Epoxy plasticizers such as epoxy soybean oil and octyl epoxy stearate; Dioctyl tin laurate, Dibutyl tin laurate And organic tin plasticizers such as trioctyl trimellitic acid and triacetylene. These plasticizers may be used alone or in combination of two or more.

  Examples of the pigment include extender pigments such as precipitated barium, talc, clay, chalk, silica white, alumina white, bentonite; titanium oxide, zircon oxide, basic sulfate, tin oxide, carbon black, graphite, bengara, Mention may also be made of colored pigments such as chrome yellow, phthalocyanine green, phthalocyanine blue and quinacridone. These pigments may be used alone or in combination of two or more.

  Examples of the solvent include hydrocarbons such as toluene, xylene, ethylbenzene, cyclopentane, octane, heptane, cyclohexane, white spirit; dioxane, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, Ethers such as ethyl glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether; esters such as butyl acetate, propyl acetate, benzyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethyl isobutyl ketone, methyl isobutyl Ketones such as ketones; n-butanol, propyl alcohol Mention may be made of the alcohol, and the like. These solvents may be used alone or in combination of two or more.

  Other additives include, for example, monobasic organic acids such as monobutyl phthalate and monooctyl succinate, camphor, castor oil, etc .; water binder, sagging agent, color separation inhibitor, anti-settling agent, antifoaming agent, etc. Can be mentioned.

  The antifouling paint is added to the antifouling resin, for example, by adding conventional additives such as the antifouling agent, plasticizer, coating film consumption regulator, pigment, solvent, ball mill, pebble mill, roll mill, sand grind. It can prepare by mixing using mixers, such as a mill. The antifouling paint can be applied to the surface of an object to be coated according to a conventional method, and then a dry coating film can be formed by removing the solvent by evaporation at room temperature or under heating.

  Since the antifouling paint contains the antifouling resin according to the present invention, the antifouling paint has high biofouling repellent activity and antibacterial properties and has little influence on the environment. Therefore, it can be expected as a multifunctional next-generation environmentally friendly paint having both antibacterial properties and adhesion repellent activity, and can be used as an alternative to organotin compounds.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims, and the embodiments can be obtained by appropriately combining technical means disclosed in different embodiments. The form is also included in the technical scope of the present invention.

Hereinafter, the present invention will be described in more detail with reference to examples.
[Example 1 Production of antifouling resin]
PVA was subjected to a crosslinking reaction with a crosslinking agent to produce an antifouling resin. As PVA, a completely saponified type having a degree of polymerization of 2000 (saponification degree: 98%), a completely saponified type having a degree of polymerization of 500 (saponification degree: 98%), and a partially saponified type having a degree of polymerization of 1500 (saponification degree: 86 to 90%). Was used. PVA was dissolved in water and stirred at 80 ° C. for 1 hour.

  Thereafter, TEOS and hydrochloric acid as a crosslinking catalyst were added to the aqueous solution of PVA, and further heated at 80 ° C. for 8 hours to obtain a translucent viscous body. Hydrochloric acid was used in an amount of 0.1 equivalent of the crosslinking agent. Moreover, what controlled the ratio of TEOS with respect to PVA was synthesize | combined and the viscous body was obtained, respectively. Moreover, instead of TEOS, OTAC, TSPIC, glyoxal, and dimethyloluric acid were used as a crosslinking agent, and a transparent viscous material was obtained by reacting under the same conditions as in the case of TEOS.

  Tables 1 to 7 show the amounts of PVA, crosslinking agent, hydrochloric acid and water used in the above reaction. The percent crosslinker designation indicates the ratio of moles of crosslinker to moles of monomer units of PVA. The total amount was weighed to 1 g.

The synthesized antifouling resin was cast on a substrate and then dried to produce a film. The film swelled when immersed in the sea and water, and retained a slimy surface. The surface is considered to be due to the high surface free energy of PVA, which is a water-soluble polymer.
[Example 2 Evaluation of marine organism adhesion repellent activity using blue mussels]
The obtained antifouling resin was applied in a circle on weblon paper (special paper industry) and dried sufficiently. The marine organism adhesion repellent activity was evaluated by counting the number of foot threads formed by blue mussels fixed in the vicinity of the coated surface.

FIG. 3 is a diagram showing a state of evaluation of marine organism adhesion repellent activity using blue mussels. As shown in FIG. 3 (a), mussels form a foot thread in a zone (sample zone) to which the antifouling resin is applied when the antifouling resin has no adhesion repellent activity. As shown in FIG. 2, when the antifouling resin has adhesion repellent activity, a foot thread is formed outside the sample zone. The repellent activity rate (%) can be expressed by the following formula 1.
Repellent activity rate (%) = (number of foot threads formed outside the sample zone / number of total foot threads) × 100 Formula 1
4 to 10 are graphs showing the results of examining the marine organism adhesion repellent activity of the antifouling resin produced in Example 1. FIG. The percentage display of the cross-linking agent on the horizontal axis indicates the ratio of the number of moles of cross-linking agent to the number of moles of monomer units of PVA. The vertical axis represents the repellent activity rate obtained by Equation 1.

  FIG. 4 shows an antifouling resin obtained by crosslinking a polymerization degree 2000, fully saponified PVA with TEOS, FIG. 5 shows an antifouling resin obtained by crosslinking polymerization degree 2000, a completely saponified PVA with OTAC, and FIG. 6 shows polymerization. Antifouling resin crosslinked by TSPIC with a degree of 2000, fully saponified PVA, FIG. 7 shows an antifouling resin obtained by crosslinking PVA with a degree of polymerization of 1500 and 90% with TEOS, FIG. 8 shows a degree of polymerization of 500, completely saponified 9 is a degree of polymerization of 2000 and a fully saponified type PVA is crosslinked with glyoxal, and FIG. 10 is a degree of polymerization of 2000 and a completely saponified type of PVA is dimethyloluric acid. It is a graph showing the marine organism adhesion repellent activity ability of the antifouling resin bridge | crosslinked by.

  As shown in FIGS. 4 to 10, the antifouling resin crosslinked with PVA showed very high marine organism adhesion repellent activity. Adhesion repellent activity is also shown in the PVA-only sample, so the direct cause of adhesion repellent is largely due to the nature of PVA, and is thought to be due to the poor conditions for the mussel. It is done.

  As described above, PVA is a hydrophilic polymer having a large number of hydroxyl groups, and has a property of being easily compatible with water. PVA swells in water and forms a state in which the surface is slimy. In other words, a state where the surface free energy is high is formed. As a result, it is considered that a situation with poor scaffolding is created for the mussel and adhesion is prevented.

  As shown in FIG. 4, in the antifouling resin in which the polymerization degree is 2000 and the completely saponified PVA is crosslinked with TEOS, the repellent activity rate is about 70% when the TEOS ratio is 0%, and the activity is not so high. Although not obtained, it was found that by cross-linking PVA with 2.5% and 5% TEOS, a very high repellent activity was obtained, and the adhesion repellent activity of PVA was further enhanced.

  When the TEOS ratio was 2.5%, the repellent activity peaked at 100%, and the activity decreased as the TEOS ratio further increased. This decrease in activity is considered to be because the surface free energy decreases because the crosslink density increases as the TEOS ratio increases and the number of hydroxyl groups in PVA decreases. That is, it is considered that the decrease in high surface free energy that imparts repellent activity to the antifouling resin is involved in the decrease in repellent activity.

  As shown in FIGS. 5 and 6, the antifouling resin obtained by crosslinking PVA with OTAC or TSPIC always showed high repellent activity even when the proportion of PVA decreased. OTAC is a quaternary ammonium antibacterial agent, and TSPIC is an isothiouronium antibacterial agent. Therefore, such a constantly high repellent activity is considered to be due to a synergistic effect between the antibacterial properties of OTAC and TSPIC and the high surface free energy of PVA.

  In the antifouling resin shown in FIGS. 7 and 8, high repellent activity was observed, but elution was confirmed after the test. This is considered to be due to the fact that PVA is generally more water-soluble as the molecular weight is smaller and the degree of saponification is lower.

  As shown in FIGS. 9 and 10, high repellent activity could be observed by using a crosslinking agent that is not limited to alkoxysilane. These high repellent activities are believed to be due to high surface free energy.

It is a reaction schematic diagram which shows obtaining the antifouling resin which concerns on this invention by bridge | crosslinking PVA with an alkoxysilane. It is a graph which shows the relationship between the surface free energy of a coating material, and a biofouling grade. It is a figure which shows the mode of the evaluation of marine organism adhesion repellent activity ability using the mussel which concerns on a present Example. It is a graph showing marine organism adhesion repellent activity ability of the antifouling resin which superposed | polymerized the degree-of-polymerization 2000 and the completely saponification type PVA by TEOS based on a present Example. It is a graph showing the marine organism adhesion repellent activity ability of the antifouling resin which superposed | polymerized the degree-of-polymerization 2000 and the completely saponified type PVA by OTAC according to a present Example. It is a graph showing the marine organism adhesion repellent activity ability of the antifouling resin which superposed | polymerized the degree-of-polymerization 2000 and the completely saponified type PVA based on a present Example by TSPIC. It is a graph showing the marine organism adhesion repellent activity ability of the antifouling resin which cross-linked PVA of the polymerization degree 1500 and saponification degree 90% which concern on a present Example by TEOS. It is a graph showing the marine organism adhesion repellent activity ability of the antifouling resin which cross-linked the degree of polymerization 500 and the completely saponified PVA with TEOS according to this example. It is a graph showing the marine organism adhesion repellent activity ability of the antifouling resin which cross-linked the degree of polymerization 2000 and the completely saponified PVA with glyoxal according to this example. It is a graph showing the marine organism adhesion repellent activity ability of the antifouling resin which cross-linked the degree of polymerization 2000 and the completely saponified type PVA with dimethylol uric acid according to this example.

Claims (5)

Including a structure in which polyvinyl alcohol is crosslinked with alkoxysilane ,
The alkoxysilane is
General formula (2);
(Wherein R ₅ , R ₆ , and R ₇ each independently represents an alkyl group. N represents a positive integer) and is a trialkoxysilane containing an isothiouronium structure. A characteristic antifouling resin. 2. The antifouling resin according to claim 1 , wherein the trialkoxysilane containing the isothiouronium structure is N- (trimethoxysilylpropyl) isothiouronium chloride. Cross-linking polyvinyl alcohol with alkoxysilane ,
The alkoxysilane is
General formula (2);
(Wherein R ₅ , R ₆ , and R ₇ each independently represents an alkyl group. N represents a positive integer) and is a trialkoxysilane containing an isothiouronium structure. A method for producing an antifouling resin. 4. The method for producing an antifouling resin according to claim 3 , wherein the trialkoxysilane containing the isothiouronium structure is N- (trimethoxysilylpropyl) isothiouronium chloride. Antifouling paint which comprises an antifouling resin of claim 1 or 2.