KR20230123770A - Method for coating superhydrophobic microbeads using water-transfer printing - Google Patents
Method for coating superhydrophobic microbeads using water-transfer printing Download PDFInfo
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- KR20230123770A KR20230123770A KR1020220020955A KR20220020955A KR20230123770A KR 20230123770 A KR20230123770 A KR 20230123770A KR 1020220020955 A KR1020220020955 A KR 1020220020955A KR 20220020955 A KR20220020955 A KR 20220020955A KR 20230123770 A KR20230123770 A KR 20230123770A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
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Abstract
본 발명은 표면이 굴곡진 대상물을 균일하게 발수코팅하는 방법에 관한 것으로서, 보다 상세하게는 처리대상물의 표면에 초소수성을 부여하는 마이크로비드를 수면에 층상화시키는 마이크로비드막 형성단계; 및 물 전사 방식으로 상기 처리대상물의 표면에 상기 마이크로비드막을 전사하는 전사단계;를 포함하는 물 전사 방식에 의한 초소수성 마이크로비드 코팅 방법에 관한 것이다.The present invention relates to a method for uniformly water-repellent coating an object having a curved surface, and more particularly, to a microbead film forming step of layering microbeads that impart superhydrophobicity to the surface of an object to be treated on the water surface; and a transfer step of transferring the microbead film to the surface of the object to be treated by a water transfer method.
Description
본 발명은 물 전사 방식에 의한 초소수성 마이크로비드 코팅 방법에 관한 것으로서, 보다 상세하게는 표면이 굴곡진 대상물을 균일하게 발수코팅하는 방법에 관한 것이다. The present invention relates to a method for coating superhydrophobic microbeads by a water transfer method, and more particularly, to a method for uniformly water-repellent coating an object having a curved surface.
고체표면의 물방울 접촉 각도로 구분되는 젖음성은 표면특성을 조절하는데 중요한 과제로 인식되고 있는데, 예를 들어 낮은 젖음성 즉, (초)소수성, (초)발수성 표면은 오염되기 어렵고 이물질을 쉽게 제거할 수 있는 등의 장점을 가지고 있어 소재 산업과 나노기술의 비약적인 발전과 함께 폭넓은 산업적인 응용 가능성을 갖고 있다. 이를테면, 초소수성 표면은 기름 흡착 및 분리에서부터 생체 의학 분야, 센서, 자가-세척, 자가-치료물질, 방식제, 얼음막이, 반사방지 코팅 등 넓고 다양하게 응용되고 있다. Wetness, which is classified as the contact angle of water droplets on a solid surface, is recognized as an important task in controlling surface properties. It has a wide range of industrial applications along with the rapid development of the material industry and nanotechnology. For example, superhydrophobic surfaces have been widely and diversely applied, from oil adsorption and separation to biomedical fields, sensors, self-cleaning, self-healing materials, anticorrosive agents, ice barriers, and antireflection coatings.
초소수성 표면의 구현은 보통 하향식(Top-down), 상향식(bottom-up), 상향식-하향식의 조합, 전자방사의 4가지 주요 접근법이 알려져 있다.Four main approaches are known to implement superhydrophobic surfaces: top-down, bottom-up, bottom-up combination, and electrospinning.
하향식은 대략적으로, 물체의 표면을 깎는 방식인데, 플라즈마, 리소그래피, 양극처리, 형판 구조(template) 등을 사용하여 초소수성을 구현하는 방법이다. 상향식은 물체의 표면에 구조체를 부가하는 방식으로, 자기 조립, 졸-겔 방법(sol-gel method), 용액 함침(solution-immersion), 화학적 침전, 층-층 집적(layer-by-layer deposition), 스프레이 코팅, 전기화학적 증착 등의 방법이 이에 해당된다.The top-down method is roughly a method of scraping the surface of an object, and is a method of implementing superhydrophobicity using plasma, lithography, anodization, template, and the like. Bottom-up is a method of adding structure to the surface of an object, such as self-assembly, sol-gel method, solution-immersion, chemical precipitation, and layer-by-layer deposition. Methods such as , spray coating, and electrochemical deposition fall under this category.
이 중에서 스프레이 코팅은 가혹한 조건이나 특별한 장치를 필요로 하지 않고 매우 단순한 방법으로 표면조도를 형성할 수 있는 장점이 있다. 예를 들어 스프레이 코팅의 일종인 전기분무(Electrospraying)는 벌크한 입자 재료로부터 직접 직경 수십 나노미터~수백 마이크로미터로 조절되는 입자를 간단하고 용이하게 제작과 동시에 분무하는 것이어서 초소수성 코팅법으로 유용하게 사용될 수 있는 잠재력을 가지고 있다. Among them, spray coating has the advantage of being able to form surface roughness in a very simple way without requiring harsh conditions or special devices. For example, electrospraying, which is a kind of spray coating, is a simple and easy way to produce and simultaneously spray particles with a diameter of tens of nanometers to hundreds of micrometers directly from bulk particle materials, making it useful as a superhydrophobic coating method. It has potential to be used.
그러나 전기분무에 의하면 표면 코팅이 불균일하고―특히 표면이 굴곡져 있으면 더욱 심해짐― 비드들끼리의 결합력이 약해 취약한 내구성을 가지는 단점이 있다. 통상적인 전기분무 방식으로 굴곡진 표면을 코팅하는 과정 및 결과의 개념도를 도 1a에, 실제 코팅결과 사진을 도 1b에 도시하였다. 도 1b에서 볼 수 있듯이 표면 굴곡에 의해 코팅이 적절하게 이루어지지 않은 부분은 발수성이 불량한 것을 알 수 있다.However, according to electrospray, the surface coating is non-uniform, especially when the surface is curved, and the bonding force between the beads is weak, resulting in poor durability. A conceptual diagram of the process and result of coating a curved surface by a conventional electrospray method is shown in FIG. 1A, and a photograph of the actual coating result is shown in FIG. 1B. As can be seen in Figure 1b, it can be seen that the water repellency is poor in the portion where the coating is not properly made due to the surface curvature.
한편, 스프레이법에 의할 때, 결합력 강화를 위해 비드들이 나노와이어에 의해 결합된 구조인 '나노와이어 비드'를 사전에 제작하여 사용하는 시도가 있는데, 이 '나노와이어 비드'는 제조 조건이 매우 까다로울 뿐 아니라 전기분무용으로는 사용이 제한된다. On the other hand, when using the spray method, there is an attempt to manufacture and use 'nanowire beads' in advance, which is a structure in which beads are combined by nanowires, to enhance bonding strength. Not only is it difficult, but its use is limited for electrospray applications.
본 발명은 물 전사 방식에 의한 초소수성 마이크로비드 코팅 방법을 제공하는 것을 목적으로 한다. An object of the present invention is to provide a method for coating superhydrophobic microbeads by a water transfer method.
보다 구체적으로, 본 발명은 전기분무를 활용하여 굴곡진 표면을 가진 처리대상물에 초소수성 마이크로비드를 고르게 코팅하는 방법을 제공하는 것을 목적으로 한다. More specifically, an object of the present invention is to provide a method of evenly coating superhydrophobic microbeads on an object to be treated having a curved surface using electrospray.
전술한 목적을 달성하기 위한 본 발명은 물 전사(water-transfer, curl fit) 방식에 의한 초소수성 마이크로비드 코팅 방법인 것을 특징으로 한다. The present invention for achieving the above object is characterized in that it is a superhydrophobic microbead coating method by a water-transfer (curl fit) method.
보다 구체적으로 본 발명은, 처리대상물의 표면에 초소수성을 부여하는 마이크로비드를 수면에 층상화시키는 마이크로비드막 형성단계; 및 물 전사 방식으로 상기 처리대상물의 표면에 상기 마이크로비드막을 전사하는 전사단계;를 포함할 수 있다.More specifically, the present invention provides a microbead film forming step of layering microbeads on the surface of the object to be treated to impart superhydrophobicity to the surface; and a transfer step of transferring the microbead film to the surface of the object to be treated using a water transfer method.
본 발명은, 상기 전사단계 이전에, 처리대상물의 표면의 이물질을 제거하거나, 이물질을 제거한 후 소정의 접착제를 코팅하는 전처리단계;를 추가로 포함하는 것이 바람직하다.The present invention, prior to the transfer step, it is preferable to further include a pretreatment step of removing foreign substances from the surface of the object to be treated or coating a predetermined adhesive after removing the foreign substances.
본 발명은, 상기 전사단계 이후에, 처리대상물을 건조하고 상기 처리대상물의 표면과 마이크로비드막의 결합력을 유도하는 소정의 처리를 하는 후처리단계;를 추가로 포함하는 것이 바람직하다.The present invention, after the transfer step, a post-processing step of drying the object to be treated and inducing a bonding force between the surface of the object and the microbead film; preferably further includes.
본 발명에서 상기 처리대상물의 표면은 전체적으로 또는 부분적으로 굴곡져 있어도 초소수성 코팅이 가능하다.In the present invention, even if the surface of the object to be treated is wholly or partially curved, superhydrophobic coating is possible.
본 발명에서 상기 마이크로비드막 형성단계는, 전기분무(Electrospraying)에 의한 마이크로비드 분무에 의해 수행되며, 상기 마이크로비드막의 마이크로비드는 마이크로비드들이 나노와이어에 의해 결합된 나노와이어-마이크로비드 구조일 수 있다. In the present invention, the step of forming the microbead film is performed by spraying microbeads by electrospraying, and the microbeads of the microbead film may have a nanowire-microbead structure in which microbeads are bonded by nanowires. there is.
이상과 같이 본 발명에 의하면 물 전사 방식에 의해 마이크로비드막이 처리대상물 표면에 코팅되므로 표면에 굴곡이 있더라도 균일하게 코팅된 초소수성 표면을 제공할 수 있게 된다. As described above, according to the present invention, since the microbead film is coated on the surface of the object to be treated by the water transfer method, it is possible to provide a uniformly coated superhydrophobic surface even if the surface has curves.
또한 본 발명에 의하면 공정과정에서 자연스럽게 '나노와이어-마이크로비드'가 형성되므로 종래 단순 마이크로비드 코팅에 비해 내구성(강도) 있는 초소수성 표면을 제공할 수 있게 된다. In addition, according to the present invention, since 'nanowire-microbeads' are naturally formed in the process, it is possible to provide a superhydrophobic surface with durability (strength) compared to conventional simple microbead coating.
도 1a는 종래 전기분무 방식으로 굴곡진 표면을 코팅하는 과정 및 결과의 개념도이고, 도 1b는 실제 굴곡진 표면을 코팅한 결과 사진.
도 2는 본 발명에 의한 초소수성 마이크로비드 코팅 방법 진행과정의 개념도.
도 3은 본 발명에 의한 초소수성 마이크로비드 코팅 방법에 의한 처리대상물이 초소수성을 가짐을 보여주는 사진.Figure 1a is a conceptual diagram of a process and result of coating a curved surface by a conventional electrospray method, Figure 1b is a photograph of the result of coating an actual curved surface.
Figure 2 is a conceptual diagram of the progress of the superhydrophobic microbead coating method according to the present invention.
3 is a photograph showing that an object to be treated by the superhydrophobic microbead coating method according to the present invention has superhydrophobicity.
이하 첨부된 도면과 실시예를 들어 본 발명을 보다 상세히 설명한다. 그러나 이러한 도면과 실시예는 본 발명의 기술적 사상의 내용과 범위를 쉽게 설명하기 위한 예시일 뿐, 이에 의해 본 발명의 기술적 범위가 한정되거나 변경되는 것은 아니다. 이러한 예시에 기초하여 본 발명의 기술적 사상의 범위 안에서 다양한 변형과 변경이 가능함은 당업자에게는 당연할 것이다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings and examples. However, these drawings and embodiments are only examples for easily explaining the content and scope of the technical idea of the present invention, and thereby the technical scope of the present invention is not limited or changed. It will be obvious to those skilled in the art that various modifications and changes are possible within the scope of the technical spirit of the present invention based on these examples.
[실시예][Example]
1. 초소수성 마이크로비드 코팅1. Superhydrophobic microbead coating
굴곡진 알루미늄박판(foil)을 처리대상물로 하였다. 처리대상물의 표면을 깨끗하게 세척한 다음 깨끗한 물이 담긴 수조에 담갔다. 이어서 소정의 방법으로 전기분무를 수행하여 마이크로비드층을 수면에 조성하였다. 이어서 알루미늄박판을 조심스럽게 물밖으로 꺼내면서 수면의 마이크로비드층을 알루미늄박판 표면으로 전사되도록 하였다. 전체 진행과정의 개념도를 도 2에 도시하였다.A curved aluminum foil was used as an object to be treated. After cleaning the surface of the object to be treated, it was immersed in a water tank containing clean water. Subsequently, electrospray was performed in a predetermined manner to form a microbead layer on the surface of the water. Subsequently, the microbead layer on the surface of the water was transferred to the surface of the aluminum thin plate while carefully taking the aluminum thin plate out of the water. A conceptual diagram of the entire process is shown in FIG. 2 .
이때 사용된 마이크로비드 재료로 PDMS 비드 용액(PVDF-HFP 2.5g + PDMS 2.5g + THF 18ml + DMF 18ml)을 사용하였고, 통상의 전기분무 장치를 통해 분무하였다. A PDMS bead solution (PVDF-HFP 2.5g + PDMS 2.5g + THF 18ml + DMF 18ml) was used as the microbead material used at this time, and sprayed through a conventional electrospray device.
2. 코팅된 표면의 초소수성 특성 분석2. Analysis of superhydrophobic properties of coated surfaces
위 1에서 코팅된 알루미늄박판(도 3 참조)의 초소수성 특성과 내구성을 분석하였다. The superhydrophobic properties and durability of the aluminum thin plate (see FIG. 3) coated in 1 above were analyzed.
(1) 초소수성 특성(1) Super hydrophobic properties
도 3에서 볼 수 있듯이, 본 발명에 의해 초소수성 코팅된 알루미늄박판 위에 물방울이 상당히 높은 접촉각도를 형성하고 있음을 알 수 있다.As can be seen in Figure 3, it can be seen that the water droplets form a fairly high contact angle on the superhydrophobic coated aluminum sheet according to the present invention.
(2) 내구성 분석(2) Durability analysis
Claims (6)
Superhydrophobic microbead coating method by water transfer method.
처리대상물의 표면에 초소수성을 부여하는 마이크로비드를 수면에 층상화시키는 마이크로비드막 형성단계;
물 전사 방식으로 상기 처리대상물의 표면에 상기 마이크로비드막을 전사하는 전사단계;를 포함하는 것을 특징으로 하는 물 전사 방식에 의한 초소수성 마이크로비드 코팅 방법.
The method of claim 1,
A microbead film forming step of layering microbeads on the surface of the object to be treated to impart superhydrophobicity to the water surface;
A superhydrophobic microbead coating method by a water transfer method comprising a; transfer step of transferring the microbead film to the surface of the object to be treated by a water transfer method.
상기 전사단계 이전에,
처리대상물의 표면의 이물질을 제거하거나, 이물질을 제거한 후 소정의 접착제를 코팅하는 전처리단계;를 추가로 포함하는 것을 특징으로 하는 물 전사 방식에 의한 초소수성 마이크로비드 코팅 방법.
The method of claim 2,
Prior to the transcription step,
The superhydrophobic microbead coating method by the water transfer method, characterized in that it further comprises a; pretreatment step of removing foreign substances from the surface of the object to be treated, or coating a predetermined adhesive after removing the foreign substances.
상기 전사단계 이후에,
처리대상물을 건조하고 상기 처리대상물의 표면과 마이크로비드막의 결합력을 유도하는 소정의 처리를 하는 후처리단계;를 추가로 포함하는 것을 특징으로 하는 물 전사 방식에 의한 초소수성 마이크로비드 코팅 방법.
The method of claim 2,
After the transcription step,
The superhydrophobic microbead coating method by water transfer method, characterized in that it further comprises a; post-processing step of drying the object to be treated and performing a predetermined treatment to induce bonding force between the surface of the object to be treated and the microbead film.
상기 처리대상물의 표면은 굴곡져 있는 것을 특징으로 하는 물 전사 방식에 의한 초소수성 마이크로비드 코팅 방법.
According to any one of claims 1 to 4,
Superhydrophobic microbead coating method by water transfer method, characterized in that the surface of the treatment object is curved.
상기 마이크로비드막 형성단계는,
전기분무(Electrospraying)에 의한 마이크로비드 분무에 의해 수행되며, 상기 마이크로비드막의 마이크로비드는 마이크로비드들이 나노와이어에 의해 결합된 나노와이어-마이크로비드 구조인 것을 특징으로 하는 물 전사 방식에 의한 초소수성 마이크로비드 코팅 방법.According to any one of claims 1 to 4,
The microbead film forming step,
It is performed by microbead spraying by electrospraying, and the microbeads of the microbead film have a nanowire-microbead structure in which microbeads are bonded by nanowires. Bead coating method.
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| KR101014277B1 (en) | 2008-12-18 | 2011-02-16 | 한국기계연구원 | Manufacturing method for anti-reflective surface and super water-repellent surface |
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| KR101014277B1 (en) | 2008-12-18 | 2011-02-16 | 한국기계연구원 | Manufacturing method for anti-reflective surface and super water-repellent surface |
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