KR20110029735A - Coating composition for drag reduction - Google Patents
Coating composition for drag reduction Download PDFInfo
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- KR20110029735A KR20110029735A KR1020090087542A KR20090087542A KR20110029735A KR 20110029735 A KR20110029735 A KR 20110029735A KR 1020090087542 A KR1020090087542 A KR 1020090087542A KR 20090087542 A KR20090087542 A KR 20090087542A KR 20110029735 A KR20110029735 A KR 20110029735A
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- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D115/00—Coating compositions based on rubber derivatives
- C09D115/02—Rubber derivatives containing halogen
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- 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
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
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Abstract
Description
본 발명은 마찰저항 저감 코팅 조성물에 관한 것으로, 중합체 수지, 수용성 고분자, 안료 및 용제를 이용하여 해수에서 발생하는 난류 유동에 의한 마찰저항을 저감하는 기능이 우수한 신규의 마찰저항 저감 코팅 조성물에 관한 것이다.The present invention relates to a frictional resistance reducing coating composition, and to a novel frictional resistance reducing coating composition having excellent function of reducing frictional resistance due to turbulent flow generated in seawater using a polymer resin, a water-soluble polymer, a pigment, and a solvent. .
대부분의 유체 유동에서 난류 마찰에 의한 에너지 손실의 양은 그 값이 매우 커서 마찰저항 감소 방법을 찾기 위한 다양한 연구가 시도되었다. In most fluid flows, the amount of energy loss due to turbulent friction is so high that various studies have been attempted to find a method for reducing frictional resistance.
마찰저항 감소 방법은 유체 유동을 안정시킬 수 있도록 물체 구조를 제작함으로써 마찰저항 감소 효과를 얻는 수동적 방법(passive device)과 유체에 첨가제(additive)를 투입하여 유체의 물리학적 및 유변학적 특성(rheological characteristics)을 조절함으로써 유체의 유동 특성을 변화시켜 마찰저항을 감소시키는 방법 등 크게 두 가지로 나눌 수 있다. Friction resistance reduction method is a passive device that achieves the effect of reducing frictional resistance by making an object structure to stabilize the fluid flow, and by adding an additive to the fluid, the physical and rheological characteristics of the fluid ) Can be divided into two ways, such as changing the flow characteristics of a fluid to reduce frictional resistance.
수동적 방법으로는 물체의 구조를 리블렛(riblets)과 같은 형상을 구성하거나 물체 표면에 물질을 코팅하여 표면마찰을 감소시키는 방법을 말하며 항공기, 선박 혹은 자동차 등과 같이 공기 혹은 유체 중에 고속으로 운동하는 물체의 마찰저항을 줄이기 위하여 연구되고 있다. 또한, 유체에 첨가물을 투입하는 방법은 마찰 저항을 일으키는 난류 유동장에서 매우 적은 양의 첨가제를 투입하여 마찰저항 감소를 달성하는 것을 말하며, 이와 같이 하면 용매만 존재할 때 발생하는 표면마찰보다 마찰저항을 현격히 감소시켜 유체의 유동을 향상시킬 수 있다.Passive method refers to a method of forming the structure of an object such as riblets or coating a material on the surface of the object to reduce surface friction. An object that moves at high speed in air or fluid, such as an aircraft, a ship, or a vehicle. To reduce the frictional resistance of the In addition, the method of adding an additive to the fluid is to achieve a frictional resistance reduction by adding a very small amount of additive in the turbulent flow field causing frictional resistance, which makes the frictional resistance significantly higher than the surface friction generated when only the solvent is present. By reducing the flow of fluid.
이 때 용매에 알맞은 첨가제를 백만분의 일(ppm) 단위의 매우 적은 양으로 난류 상태의 흐름 속에 첨가하면 최고 80 %까지의 효과를 얻을 수 있다(Toms, B. A., Proc. 1st Int. Congress on Rheology, 1984). 이러한 마찰을 감소시키는 첨가제들로는 긴 사슬 구조의 분자들, 콜로이드성 비누용액, 미세 현탁액, 불용성이며 비탄성의 입자들, 합성고분자와 같은 거대분자 물질들 및 생체 고분자(biopolymers)와 계면활성제(surfactants) 등이 사용되고 있다. 상기 첨가제들 중에서 가장 많이 사용되고 있는 것은 고분자 물질이며, 고분자를 이용한 마찰저항 감소 효과에 영향을 주는 인자로는 고분자 종류 및 구조, 고분자 농도, 고분자 분자량, 용액의 온도, 레이놀즈 수, 용매의 성질 등 다수의 파라미터가 있음이 알려져 있다. 이러한 고분자 첨가제에 의한 마찰저항 감소 현상의 원인으로는 고분자 용액의 점탄성(viscoelasticity)에 연관이 있다고 일반적으로 받아들여지고 있다(Armstrong, R. et al., J. Chem. Phys., 79: 3143; 1983, Vlassopoulos, D., J. Rheel., 38: 1427; 1994). At this time, additives suitable for solvents can be added to the turbulent flow in very small amounts in parts per million (ppm) to achieve an effect of up to 80% (Toms, BA, Proc. 1st Int. Congress on Rheology , 1984). Such friction reducing additives include long chain molecules, colloidal soap solutions, microsuspensions, insoluble and inelastic particles, macromolecular materials such as synthetic polymers, biopolymers and surfactants, and the like. Is being used. Among the additives, polymer materials are used most frequently, and factors affecting the frictional resistance reduction effect using polymers include polymer type and structure, polymer concentration, polymer molecular weight, solution temperature, Reynolds number, and solvent properties. It is known that there is a parameter of. It is generally accepted that the cause of the frictional resistance reduction caused by the polymer additive is related to the viscoelasticity of the polymer solution (Armstrong, R. et al., J. Chem. Phys., 79: 3143; 1983 , Vlassopoulos, D., J. Rheel., 38: 1427; 1994).
상기 고분자 물질들 중에서도 가장 효과적으로 마찰을 감소시키는 것으로 알려진 것은 일반적으로 선형 및 긴 사슬의 분자 구조를 가지며 분자량이 매우 큰 것이다. 특히, 상기와 같은 조건을 만족시키는 선형 폴리에틸렌 옥사이드(polyethylene oxide, PEO)가 물을 용매로 하는 계에서 마찰저항을 감소시키는 첨가제로서 널리 사용되고 있으며(Fisher, H. et al., J. Appl. Polym. Sci., 15: 2975; 1971), 유기성 용매 내에서는 거의 유일하게 폴리이소부틸렌(polyisobutylene)이 알려져 있다(Burger E. D. et al.,J. Rheol., 24, 603, 1980). Among the above polymer materials, those which are known to reduce friction most effectively are generally linear and long chain molecular structures and very high molecular weights. In particular, linear polyethylene oxide (PEO) that satisfies the above conditions is widely used as an additive for reducing frictional resistance in water-based systems (Fisher, H. et al., J. Appl. Sci., 15: 2975; 1971), polyisobutylene is known almost exclusively in organic solvents (Burger ED et al., J. Rheol., 24, 603, 1980).
한편, 한국공개특허 제10-2002-0004031호에는 폴리에틸렌 옥사이드(PEO)를 첨가제로 이용한 해수 난류 유동의 마찰저항 감소방법이 개시되어 있다. 상기 문헌은 해수 중에 40 ~ 100 ppm의 PEO를 첨가한 후, 그 PEO 농도를 일정하게 유지할 수 있는 회전원판 장치를 이용하여 마찰저항 저감치(%DR)가 감소함을 기재하였다. 상기 고분자 화합물을 첨가하여 마찰저항을 감소시키는 방법은 관 유동의 경우 최적의 저항저감 기법으로 적용되고 있으나, 선박에는 쉽게 적용되지 못하고 있는 실정이다. 이는 관 유동과 같은 내부 유동에서는 첨가된 고분자 물질이 계속 유동 속에 머무르면서 저항저감을 일으키지만 선박 주위에 경계층 외부 유동에서는 곧바로 씻겨 나가기 때문에 연속적인 고분자 화합물의 분사가 요구되기 때문이다. Meanwhile, Korean Laid-Open Patent Publication No. 10-2002-0004031 discloses a method of reducing frictional resistance of seawater turbulent flow using polyethylene oxide (PEO) as an additive. The document described that after adding 40 to 100 ppm of PEO in seawater, the frictional resistance reduction value (% DR) was reduced by using a rotating disc apparatus capable of maintaining the PEO concentration constant. The method of reducing the frictional resistance by adding the polymer compound is applied as an optimal resistance reduction technique in the case of pipe flow, but is not easily applied to a ship. This is because in the internal flow, such as pipe flow, the added polymer material stays in the flow, causing a decrease in resistance, but the continuous polymer compound injection is required because it immediately washes away in the flow outside the boundary layer around the vessel.
상기 문제점을 해결하기 위하여 선체에 분사공을 만들어 재가공하는 방법이 있으나 이는 분사에 추가적인 에너지가 소모되므로 신뢰성 및 경제성 측면에서 실제 선박에 적용하는데 한계가 있다.In order to solve the above problem, there is a method of making and reprocessing the injection hole in the hull, but this is because the additional energy is consumed in the injection, there is a limit to apply to the actual ship in terms of reliability and economics.
본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위한 것으로, 중합체 수지, 수용성 고분자, 안료 및 용제를 포함하는 마찰저항 저감 코팅 조성물을 제공하는데 목적이 있다.The present invention is to solve the problems of the prior art as described above, it is an object to provide a frictional resistance reducing coating composition comprising a polymer resin, a water-soluble polymer, a pigment and a solvent.
보다 구체적으로는 중합체 수지, 수용성 고분자, 안료 및 용제를 이용하여 유체 계면에서 발생하는 난류 유동에 의한 마찰저항을 저감하는 기능이 우수하며, 다양한 구조물에 적용 가능하고, 특히, 선박 표면에서의 마찰저항 감소 및 연료비 절감면에서 탁월한 마찰저항 저감 코팅 조성물 제공하는데 본 발명의 목적이 있다.More specifically, it is excellent in reducing frictional resistance due to turbulent flow generated at the fluid interface using polymer resins, water-soluble polymers, pigments, and solvents, and is applicable to various structures. It is an object of the present invention to provide excellent frictional resistance reducing coating compositions in terms of reduction and fuel cost savings.
본 발명은 상기 목적을 달성하기 위하여 안출된 것으로, 마찰저항 저감 코팅 조성물을 제공한다.The present invention has been made to achieve the above object, to provide a frictional resistance reducing coating composition.
이하 본 발명을 더욱 상세하게 설명한다.Hereinafter, the present invention will be described in more detail.
이때, 사용되는 기술 용어 및 과학 용어에 있어서 다른 정의가 없다면, 이 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 통상적으로 이해하고 있는 의미를 가지며, 하기의 설명에서 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 설명은 생략한다.In this case, unless there is another definition in the technical terms and scientific terms used, it has the meaning that is commonly understood by those of ordinary skill in the art, unnecessarily obscure the subject matter of the present invention in the following description Description of known functions and configurations that may be omitted.
본 발명은 마찰저항 저감 코팅 조성물에 관한 것으로, 중합체 수지, 수용성 고분자, 안료 및 용제를 포함하는 마찰저항 저감 코팅 조성물에 관한 것이다.The present invention relates to a frictional resistance reducing coating composition, and to a frictional resistance reduction coating composition comprising a polymer resin, a water-soluble polymer, a pigment and a solvent.
상기 중합체 수지는 알키드 수지, 에폭시 수지, 폴리에스테르 수지, 비닐 수지, 로진, 염화고무 수지, 자기마모형 수지에서 선택되는 어느 하나 또는 둘 이상의 혼합물을 포함할 수 있다. 상기 자기마모형 수지는 금속카르복실레이트 함유 중합체 또는 유기규소 에스테르기 함유 중합체 등이 있으며, 구체적인 예로는 아연아크릴레이트 중합체, 구리아크릴레이트 중합체, 실릴아크릴레이트 중합체에서 선택되는 어느 하나 또는 둘 이상의 혼합물을 들 수 있다. 상기 자기마모형 수지는 용매의 접촉 부위의 카르복실기가 염을 형성하여 수지가 수화되거나 팽윤되어 표면에서 이탈됨에 따라 새로운 표층이 도출되는 수지로서 시간 경과에 따른 균일한 수용성 고분자(마찰저항 저감제)의 용출을 제공하므로 본 발명의 조성성분을 함께 사용하여야 한다. The polymer resin may include any one or a mixture of two or more selected from alkyd resins, epoxy resins, polyester resins, vinyl resins, rosin, rubber chloride resins, and self-wearing resins. The self-wearing resin may be a metal carboxylate-containing polymer or an organosilicon ester group-containing polymer. Specific examples thereof include any one or a mixture of two or more selected from zinc acrylate polymers, copper acrylate polymers, and silyl acrylate polymers. Can be mentioned. The self-wearing resin is a resin in which a new surface layer is derived as the carboxyl group at the contact portion of the solvent forms a salt and the resin is hydrated or swelled and is separated from the surface. Since dissolution is provided, the composition of the present invention should be used together.
또한, 본 발명에서는 상기 금속카르복실레이트 함유 중합체의 마모율을 조절하기 위하여, 즉 마모속도를 조절하기 위하여 자기마모형 수지에 로진화합물을 혼합하여 사용할 수도 있으며 그 함량은 자기마모형 수지에 대하여 1 ~ 80 중량%로 사용가능하다. 구리아크릴레이트 중합체는 구리 화합물을 함유하고 있으나, 구리 화합물은 국제해사기구에서 규제대상으로 검토가 진행되고 있으므로 향후 그 적용에는 한계가 있을 수 있다. In addition, in the present invention, in order to control the wear rate of the metal carboxylate-containing polymer, that is, to control the wear rate, a rosin compound may be mixed with the self-wearing resin, and the content thereof may be from 1 to about the self-wearing resin. 80% by weight can be used. The copper acrylate polymer contains a copper compound, but since the copper compound is under review by the International Maritime Organization, the application may be limited in the future.
본 발명에서 마찰저항 저감제로 사용되는 수용성 고분자는 폴리에틸렌옥사이드(polyethylene oxide, PEO), 잔탄검(xanthan gum), 폴리아크릴아마이드(polyacrylamide)에서 선택되는 어느 하나 또는 둘 이상의 혼합물을 들 수 있으며, 상기 수용성 고분자는 선형의 긴 사슬 구조를 갖는 고분자 물질로 중량평균분 자량(Mw)이 5,000 ~ 9,000,000인 것을 특징으로 한다. 중량평균분자량이 5,000 미만인 경우에는 충분한 마찰저항 저감 성능을 확보하기 어려우며, 9,000,000을 초과하는 경우에는 코팅 조성물의 점도가 상승하여 분산성이 감소하는 문제가 있다. 따라서 상기 범위를 갖는 고분자 물질을 이용함으로써 마찰저항 저감 코팅 조성물 제조 시 분산성을 향상 시킬 수 있는 이점이 있다.The water-soluble polymer used as a frictional resistance reducing agent in the present invention may be any one or a mixture of two or more selected from polyethylene oxide (PEO), xanthan gum, polyacrylamide, the water-soluble The polymer is a polymer material having a linear long chain structure, and has a weight average molecular weight (Mw) of 5,000 to 9,000,000. When the weight average molecular weight is less than 5,000, it is difficult to secure sufficient frictional resistance reduction performance, and when the weight average molecular weight exceeds 9,000,000, there is a problem in that the viscosity of the coating composition is increased to reduce dispersibility. Therefore, by using a polymer material having the above range has the advantage that can improve the dispersibility when manufacturing a frictional resistance reducing coating composition.
본 발명에 사용되는 안료는 당 분야에 사용하는 통상의 안료로서, 그 성분이 한정되는 것은 아니지만 구체적으로 예를 들면 탈크, 운모, 점토, 탄산칼슘, 카올린, 알루미나 화이트, 화이트 카본, 수산화알루미늄, 탄산마그네슘, 탄산바륨, 황산바륨, 벤토나이트, 카본블랙, 프탈로시아닌 블루, 감청, 티탄백, 벵갈라, 바리타 가루, 백악, 산화철 가루, 아연화, 아연말에서 선택되는 어느 하나 또는 둘 이상의 혼합물을 들 수 있다. 본 발명에서 상기 안료는 평균입경이 250 메쉬 이하의 것이라면 사용에 제한이 없으며, 좋게는 250 ~ 5,000 메쉬의 것이 더 좋다.Pigments used in the present invention are conventional pigments used in the art, and the components thereof are not limited, but specific examples thereof include talc, mica, clay, calcium carbonate, kaolin, alumina white, white carbon, aluminum hydroxide, and carbonic acid. Magnesium, barium carbonate, barium sulfate, bentonite, carbon black, phthalocyanine blue, bluish blue, titanium bag, bengala, barita powder, chalk, iron oxide powder, galvanized, zinc powder, or any one or more thereof selected from zinc powder. In the present invention, the pigment is not limited to use as long as the average particle diameter is 250 mesh or less, and preferably 250 to 5,000 mesh.
본 발명의 마찰저항 저감 코팅 조성물에 사용되는 용제로는 크실렌, 톨루엔, 에틸벤젠, 사이클로펜탄, 옥탄, 헵탄, 사이클로헥산, 화이트스피리트를 포함하는 탄화수소류; 다이옥산, 테트라하이드로퓨란, 에틸렌글리콜모노메틸에테르, 에틸렌글리콜모노에틸에테르, 에틸렌글리콜다이메틸에테르, 에틸렌글리콜모노부틸에테르, 에틸렌글리콜다이부틸에테르, 다이에틸렌글리콜모노메틸에테르, 다이에틸렌글리콜모노에틸에테르를 포함하는 에테르류; 아세트산부틸, 아세트산프로필, 아세트산벤질, 에틸렌글리콜모노메틸에테르 아세테이트, 에틸렌글리콜모노에틸에테르 아세테이트를 포함하는 아세테르류; 에틸이소부틸케톤, 메틸이소부틸케톤을 포함하는 케 톤류; 부탄올, 프로판올를 포함하는 알콜류;에서 선택되는 어느 하나 또는 둘 이상의 혼합물을 들 수 있다.Solvents used in the frictional resistance reduction coating composition of the present invention include hydrocarbons including xylene, toluene, ethylbenzene, cyclopentane, octane, heptane, cyclohexane, and white spirit; Dioxane, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, ethylene glycol monobutyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether Ethers containing; Aceters including butyl acetate, propyl acetate, benzyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate; Ketones including ethyl isobutyl ketone and methyl isobutyl ketone; Alcohols including butanol and propanol; any one or a mixture of two or more selected.
상기와 같은 목적을 달성하기 위하여 본 발명의 마찰저항 저감 코팅 조성물은 코팅 조성물 총 중량에 대하여 중합체 수지 5 ~ 60 중량%, 수용성 고분자 1 ~ 20 중량%, 안료 15 ~ 60 중량% 및 용제 5 ~ 25 중량%를 포함하는 것이 바람직하다. 본 발명의 중합체 수지는 5 ~ 60 중량%로 사용하는 것이 좋으며, 상기 범위일 경우 코팅 조성물에 포함되는 안료 및 첨가물질에 대한 상용성이 우수하면서도 균일한 수용성 고분자 용출을 유지할 수 있는 이점이 있다. 상기 수용성 고분자는 1 ~ 20중량%로 사용하는 것이 좋으며, 상기 범위일 경우 코팅 조성물 제조 시 적절한 분산 성능을 유지하면서 우수한 마찰저항 저감 성능을 보이는 이점이 있고, 상기 안료는 15 ~ 60 중량%로 사용하는 것이 좋으며, 상기 범위일 경우에는 우수한 도막 성능 및 작업성을 갖는 이점이 있다. 또한 용제는 5 ~ 25 중량%로 사용하는 것이 좋으며, 상기 범위를 벗어날 경우 1회 도장 후 적절한 건조 도막두께 및 균일한 도막상태를 갖기 어려운 문제점이 있다. In order to achieve the above object, the frictional resistance reducing coating composition of the present invention is based on the total weight of the coating composition of 5 to 60% by weight of the polymer resin, 1 to 20% by weight of the water-soluble polymer, 15 to 60% by weight of the pigment and 5 to 25 solvents. It is preferable to include the weight percent. It is preferable to use the polymer resin of 5 to 60% by weight, and in the above range, there is an advantage in that the compatibility with the pigments and additives included in the coating composition is excellent while maintaining uniform water-soluble polymer dissolution. The water-soluble polymer is preferably used in 1 to 20% by weight, there is an advantage in showing an excellent frictional resistance reduction performance while maintaining the appropriate dispersion performance in the coating composition in the above range, the pigment is used in 15 to 60% by weight It is better to, and in the above range there is an advantage having excellent coating film performance and workability. In addition, the solvent is good to use 5 to 25% by weight, if out of the range there is a problem that it is difficult to have a suitable dry film thickness and uniform coating state after coating once.
본 발명에 따른 마찰저항 저감 코팅 조성물은 필요에 따라 공지된 다양한 첨가제를 포함할 수 있다. The frictional resistance reducing coating composition according to the present invention may include various known additives as necessary.
본 발명의 마찰저항 저감 코팅 조성물은 통상의 도료 제조방법으로 제조한다. 예를 들어, 중합체 수지를 크실렌 등의 유기 용제로 완전히 용해시킨 다음, 수용성 고분자 및 안료를 첨가하여 혼합 분쇄기 또는 교반기에 넣고 기계적으로 균일하게 분쇄 혼합하는 방법을 사용할 수 있다. The frictional resistance reducing coating composition of the present invention is prepared by a conventional paint production method. For example, a method of completely dissolving a polymer resin in an organic solvent such as xylene, then adding a water-soluble polymer and a pigment, putting it in a mixing grinder or stirrer, and mechanically and uniformly mixing may be used.
본 발명에 따른 마찰저항 저감 코팅 조성물은 중합체 수지, 수용성 고분자, 안료 및 용제를 이용하여 유체 계면에서 발생하는 난류 유동에 의한 마찰저항을 저감하는 기능이 우수하며, 다양한 구조물에 적용 가능하고, 특히, 선박 표면에서의 마찰저항 감소 및 연료비 절감면에서 탁월한 효과가 있다. 또한 본 발명에 따른 마찰저항 저감 코팅 조성물은 마찰저항 저감제인 수용성 고분자 화합물이 가수분해 과정에서 자연적으로 용출되어 균일하게 수중으로 분사됨으로써 우수한 마찰저항 저감 성능을 발휘하여, 강관, 선박, 해양 구조물 등의 마찰저항 저감 도료로서 유용하다.The frictional resistance reducing coating composition according to the present invention is excellent in the function of reducing the frictional resistance due to turbulent flow generated at the fluid interface by using a polymer resin, a water-soluble polymer, a pigment and a solvent, and is particularly applicable to various structures, It has an excellent effect in reducing frictional resistance and fuel cost on the surface of the ship. In addition, the frictional resistance reducing coating composition according to the present invention exhibits excellent frictional resistance reduction performance by uniformly dissolving the water-soluble high molecular compound, a frictional resistance reducing agent during the hydrolysis process, uniformly in water, such as steel pipes, ships, marine structures, etc. It is useful as a frictional resistance reducing paint.
이하, 실시예에 의해 본 발명을 보다 상세하게 설명하나, 이는 발명의 구성 및 효과를 이해시키기 위한 것 일뿐, 본 발명의 범위를 제한하고자 하는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples, which are intended only for understanding the constitution and effects of the present invention, and are not intended to limit the scope of the present invention.
[시험예 1] 저장안정성Test Example 1 Storage Stability
제조한 마찰저항 저감 코팅 조성물을 고온(60 ℃)에서 2개월간 저장한 후 육안에 의해 상태를 평가하였다. 2개월 후에도 분리 침강이 보이지 않고 재분산성이 양호한지를 판단하였다.After storing the prepared frictional resistance reduction coating composition at high temperature (60 ℃) for 2 months, the state was evaluated by visual observation. After 2 months, it was judged that no sedimentation sedimentation was observed and the redispersibility was good.
[시험예 2] 마찰저항 저감성능Test Example 2 Friction Resistance Reduction Performance
마찰저항계수(Cf)의 차이를 계측하기 위하여 각각의 코팅 조성물을 1,520 mm(가로)×225 mm(세로)×1.2 mm(두께)인 탄소강판에 약 300 ㎛ 두께로 양면 도장하였으며, 각 도장 평판에 대한 예인수조 저항측정을 실시하였다. 예인수조의 크기는 100 m(길이)×8 m(폭)×3.5 m(깊이)이고, 예인전차의 최대속도는 7.5 m/s이다. 예인수조시험에서 측정되는 총 저항으로부터 마찰저항 성분을 추출하기 위해서 Schultz(2004)에 의해서 제안된 유동방법(flowing method)을 이용하였다. 즉 흘수(Draft)를 변화시키면서 총 저항을 측정하면 조파저항은 일정하게 유지되는 가운데 접수면적(wetted surface area)에 마찰저항이 직접적으로 비례하므로, 코팅 조성물이 도장된 평판의 침수면적이 225 mm 및 25 mm에서의 전체 저항으로부터 표면마찰저항을 아래와 같이 계측하였다.In order to measure the difference in the frictional resistance coefficient (C f ), each coating composition was coated on both sides with a thickness of about 300 μm on a carbon steel sheet 1,520 mm (w) × 225 mm (h) × 1.2 mm (thick). Towing bath resistance measurements were performed on the plate. The towing tank size is 100 m (length) x 8 m (width) x 3.5 m (depth), and the maximum speed of the towing tank is 7.5 m / s. The flow method proposed by Schultz (2004) was used to extract the frictional resistance component from the total resistance measured in the towing tank test. In other words, when the total resistance is measured while changing the draft, since the frictional resistance is directly proportional to the welded surface area while the wave resistance remains constant, the immersion area of the plate coated with the coating composition is 225 mm and The surface frictional resistance was measured from the total resistance at 25 mm as follows.
225 mm 전체저항 = 225 mm 표면마찰저항 + 조파저항225 mm total resistance = 225 mm surface frictional resistance + harmonic resistance
25 mm 전체저항 = 25mm 표면마찰저항 + 조파저항25 mm total resistance = 25mm surface frictional resistance + harmonic resistance
200 mm 표면마찰저항 = 225 mm 전체저항 - 25 mm 전체저항200 mm surface frictional resistance = 225 mm total resistance-25 mm total resistance
각 예인전차 속도에서는 비교예를 기준(baseline) 마찰저항계수(Cf)로 하였을 때 각 실시예에 대한 마찰저항계수의 감소정도를 마찰저항 저감율(%)로 나타냈었다. In each towing vehicle speed, when the comparative example was used as the baseline frictional resistance coefficient (C f ), the degree of reduction of the frictional resistance coefficient for each example was expressed as a reduction rate of frictional resistance (%).
[실시예 1 ~ 12 및 비교예 1 ~ 2] [Examples 1 to 12 and Comparative Examples 1 and 2]
2 L 용기 내에 기계식 교반기 혹은 분쇄기를 사용하여 회전속도 2000 rpm으로 교반하여 하기 표 1의 실시예 및 비교예의 조성 및 조성비로 혼합하여 마찰저항 저감도료 조성물을 제조하였다. 상기 실시예와 비교예의 조성물에 따른 저장안정성 및 마찰저항 저감성능을 하기 표 2와 도 1에 수록하였다. 본 발명에서 별도의 기재가 없다면 함량은 중량%이다. In a 2 L container using a mechanical stirrer or a pulverizer was stirred at a rotational speed of 2000 rpm and mixed in the compositions and composition ratios of the examples and comparative examples of Table 1 below to prepare a frictional resistance reducing paint composition. Storage stability and frictional resistance reduction performance according to the composition of the Examples and Comparative Examples are listed in Table 2 and FIG. In the present invention, the content is weight percent unless otherwise stated.
[표 1] TABLE 1
(a) 자기마모형 아연아크릴레이트 중합체((주)벽산페인트, A/F 356)(a) Self-wearing zinc acrylate polymer (Burksan Paint, A / F 356)
(b) 로진(b) rosin
(c) PEO(중량평균분자량(Mw) 900,000)(c) PEO (weight average molecular weight (Mw) 900,000)
(d) Xanthan gum(Sigma)(d) Xanthan gum (Sigma)
(e) Polyacrylamide(중량평균분자량(Mw) 9,000,000)(e) Polyacrylamide (weight average molecular weight (Mw) 9,000,000)
(f) 산화아연(평균입경 1,000 메쉬)(f) Zinc oxide (average particle size 1,000 mesh)
(g) 산화티탄(평균입경 1,000 메쉬)(g) Titanium oxide (average particle diameter 1,000 mesh)
(h) 산화철(평균입경 1,000 메쉬)(h) Iron oxide (average particle size 1,000 mesh)
(i) 크실렌(i) xylene
(j) 탈크(평균입경 1,000 메쉬)(j) Talc (average particle size 1,000 mesh)
[표 2] TABLE 2
상기 표 2에 나타낸 마찰저항 저감률(%)은 앞서 서술한 바와 같이 각 예인전차 속도에서 비교예를 기준(baseline) 마찰저항계수(Cf)로 하였을 때 각 실시예에 대한 마찰저항계수의 감소정도를 나타낸 것이다.As described above, the frictional resistance reduction rate (%) shown in Table 2 is a reduction in the frictional resistance coefficient for each example when the baseline frictional resistance coefficient (C f ) is used as a comparative example at each towing vehicle speed. The degree is shown.
상기 표 2에서 보는 바와 같이 본 발명의 마찰저항 저감 코팅 조성물의 저장안정성은 수용성 고분자(마찰 저항 저감제)를 첨가하지 않은 비교예와 동동하게 양호한 상태를 보여 수용성 고분자와 상용 도료와의 상용성이 우수함을 확인할 수 있었다. 또한 수용성 고분자의 함량이 증가함에 따라 마찰저항 저감률(%)이 증가하는 현상을 보였으며, 이를 통해 수용성 고분자가 우수한 마찰저항 저감 효과를 갖는 것을 확인할 수 있었다. 반면 수용성 고분자를 투입하지 않은 비교예의 경우에는 마찰저항 저감 성능이 발현되지 않음을 알 수 있었다.As shown in Table 2, the storage stability of the frictional resistance reducing coating composition of the present invention shows a good state in the same manner as the comparative example without adding the water-soluble polymer (friction resistance reducing agent), so that the compatibility between the water-soluble polymer and the commercial coating material It was confirmed that excellent. In addition, as the content of the water-soluble polymer increased the frictional resistance reduction rate (%) showed a phenomenon, through which it was confirmed that the water-soluble polymer has an excellent frictional resistance reducing effect. On the other hand, in the case of the comparative example is not added to the water-soluble polymer it was found that the frictional resistance reduction performance is not expressed.
또한 도 1은 본 발명의 실시예 및 비교예의 조성물에 따른 마찰저항 저감성능을 나타낸 것으로, 본 발명에서 개발한 마찰저항 저감 코팅 조성물이 도장된 시편의 마찰저항계수(Cf)를 구하기 위한 예인수조시험 결과를 나타낸 것이다. 각 시험 은 수용성 고분자를 함유한 실시예와 함유하지 않은 비교예를 동시에 수행하였으며, 각 시험 조건에서 측정된 실시예 및 비교예(기준)의 마찰저항계수(Cf)를 한 조(set)로 나타내었다. 도 1에서 보이는 바와 같이 수용성 고분자의 함량이 증가함에 따라 마찰저항계수(Cf)가 작아져, 즉, 마찰저항 저감율(%)이 증가하는 것을 확인할 수 있었다. 그러나 앞서 설명한 바와 같이 도료 상용성 및 코팅 저감제의 균일한 방출을 유지하기 위해서는 전체 코팅 조성물에서 수용성 고분자가 적절한 함량을 유지하는 것이 필수적이다. In addition, Figure 1 shows the frictional resistance reduction performance according to the compositions of Examples and Comparative Examples of the present invention, a towing tank for obtaining a frictional resistance coefficient (C f ) of the specimen coated with a frictional resistance reducing coating composition developed in the present invention The test results are shown. Each test was performed simultaneously with the examples containing the water-soluble polymer and the comparative example without, and the frictional resistance coefficient (C f ) of the examples and the comparative examples (reference) measured under each test condition as a set (set) Indicated. As shown in FIG. 1, as the content of the water-soluble polymer increases, the frictional resistance coefficient C f decreases, that is, the frictional resistance reduction rate (%) increases. However, as described above, it is essential to maintain an appropriate content of the water-soluble polymer in the overall coating composition in order to maintain the coating compatibility and uniform release of the coating reducing agent.
또한 본 발명에 따른 마찰저항 저감 코팅 조성물을 선박에 적용할 경우, 선박 표면의 마찰저항을 감소시켜 최대 선박 연료 소모량 저감에 기여할 수 있다. In addition, when the frictional resistance reduction coating composition according to the present invention is applied to a vessel, it can contribute to the reduction of the maximum fuel consumption by reducing the frictional resistance of the vessel surface.
도 1은 본 발명의 실시예 및 비교예의 조성물에 따른 마찰저항 저감성능을 나타낸 것이다.Figure 1 shows the frictional resistance reduction performance according to the compositions of Examples and Comparative Examples of the present invention.
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| KR101524729B1 (en) * | 2013-06-28 | 2015-06-01 | 부산대학교 산학협력단 | Copolymer comprised of hydrophillic polymer and drag reduction composition comprising the same |
| CN112552793A (en) * | 2020-12-11 | 2021-03-26 | 吉林大学 | Bionic drag reduction coating for large-scale spinning body and preparation method thereof |
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| JP2003277691A (en) * | 2002-03-26 | 2003-10-02 | Nippon Paint Co Ltd | Coating film for decreasing friction in water and method for decreasing friction in water |
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| KR101524729B1 (en) * | 2013-06-28 | 2015-06-01 | 부산대학교 산학협력단 | Copolymer comprised of hydrophillic polymer and drag reduction composition comprising the same |
| CN112552793A (en) * | 2020-12-11 | 2021-03-26 | 吉林大学 | Bionic drag reduction coating for large-scale spinning body and preparation method thereof |
| KR102435592B1 (en) * | 2022-01-21 | 2022-08-24 | 주식회사 에스엘티지 | Pharmaceutical Capsule Appearance Inspection Device |
| WO2023140417A1 (en) * | 2022-01-21 | 2023-07-27 | (주)에스엘티지 | Pharmaceutical capsule appearance inspection device |
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