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Biomimetic coating technology is a technical science
that provides new design ideas, working principles and system composition for coating engineering technology through the structure, properties, principles, behaviors and interactions of biological systems.
The coating industry seeks inspiration and simulation from the biological world to promote the technical level of the coating industry, which is an important development direction to promote the development
of coating science in the direction of microscopic, systematic, intelligent, fine and clean, and to enhance the original innovation ability of coating science and technology.
CC
App development
The most famous in the application development of biomimetic coating technology is the research
on the biomimetic self-cleaning function of lotus leaf of coating.
In the 70s of the 20th century, Bart Lott, a botanist at the University of Bonn in Germany, discovered the lotus leaf effect when studying plant foliage, that is, many plants have more than 40% of pollutants left on the leaf surface, and the proportion of pollutants residue on the leaf surface of lotus leaves is less than 5 ％
。 The surface of the lotus leaf is covered with tiny waxy particles and covered with countless micron-sized packets, which are covered with finer villi
with a diameter of only a few hundred nanometers.
This special nanostructure makes the surface of the lotus leaf not stick to water, and the water droplets are stained with dust on the leaf surface and slide off at high speed, realizing the self-cleaning function
.
In 1999, a research team at the University of Bonn, in collaboration with ISPO, produced the Lotusan paint, which uses 5, by mimicking the microstructure of the surface surface of lotus leaves, using the waterproof properties of silicone Over the years, the self-cleaning effect has not changed
.
In the 2000s, the Institute of Chemistry of the Chinese Academy of Sciences prepared the micro-nano and nano-dual structure of the polymer through molecular design, using the principle of self-aggregation, surface tension and phase separation of the polymer in the solvent evaporation process, and directly formed a film at room temperature and atmospheric conditions to construct a micro-nano double structure polymer surface similar to lotus leaf, and obtained a bionic coating with superhydrophobic and oleophobic properties, the contact angle of water and oil can be as high as 166 ° and 140 ° respectively, and the rolling angle of water on the bionic surface of the coating is only 3.
4±2.
0 ° , can be rolled freely, has a self-cleaning effect
similar to the surface of lotus leaves.
This type of technology is used in the production of architectural coatings, clothing fabrics, kitchenware panels and other coating products that require dirt resistance, and has very good results
.
CC
Case sharing
Working with AkzoNobel, Wageningen University in the Netherlands, and the University of Cambridge in the United Kingdom, inspired by the inner wall properties of Nepenthes insect, Audrey developed a conceptual pitcher plant biomimetic ultra-slippery paint (without pesticides) that is conceptually designed to make the surface so smooth that ants cannot climb
.
Ants climb walls by using a combination of miniature claws and sticky feet (they also expel liquids like glue).
Therefore, the paint design idea is to use a small enough particle so that the ant's miniature claw cannot attach to it, and at the same time these particles can detach from the paint and stick to the ant's paw, so that they can no longer stick to anything else, so that it is no longer sticky, so it falls off the wall
.
Studies have shown that as the experimental paint is gradually optimized, no ants can climb onto the surface
on which the paint is applied.
Scientists at Harvard University have also modeled the inner skin of Nepenthes hogpenis to produce a transparent coating that can be used economically on a variety of objects, including ship hulls.
The coating developed by simulating the skin structure of Nepenthes can heal itself almost immediately, even if the coating is scraped off with a knife or blade, and can cope with environmental pollutant pollution and degradation, achieve self-healing ability and damage tolerance, and can be applied to extreme temperature and high pressure environments
.
Researchers in the United States, France, Japan and other countries attach great importance to the research
of chameleon camouflage coatings.
In order to prevent harm from other animals and facilitate hunting, chameleons can automatically change color as the environment changes to hide themselves
.
This is because the cells of the chameleon's multilayer skin contain green pigment that can move, sometimes aggregating in a little and sometimes spreading out, thus changing body color
.
An American camouflage expert asserts that in 15 years, chameleon camouflage will enter the practical stage
.
The representative of this type of research in Europe is France
.
It is reported that the French National Center for Scientific Research and the Arcueil Technology Center have studied three types of chameleon coatings according to the contract of the French General Directorate of Weapons and Equipment, collectively known as "X-chromism" coatings, including photochromism, thermochromism and electrochromism
.
They are both in the visible and infrared ranges, and although they have their own characteristics, they have the commonality
of color change in multiple application types.
According to the bionic design of lotus root structure, the self-layered gradient anti-corrosion coating can be self-layered after spraying, the surface of the layered coating is hydrophobic and self-clean, anti-ultraviolet, the bottom layer has strong adhesion and corrosion resistance, and the middle layer plays a stabilizing role to obtain a high anti-corrosion intelligent gradient bionic coating
。 When PU/EP∶fluorosilicon modified PAA=1∶1, the contact angle reaches 96.
0°, the flexibility is 0.
5 mm, the impact resistance is 50cm, the adhesion grade is 1, and the light loss rate is reduced to 19%; When butyl acetate (NBAC)∶n-butanol (NBA)=4∶6, the coating film stratification is good, the contact angle reaches 107.
7°, the water resistance is unchanged for 48 h after immersion in water, and the light loss rate is reduced to 17%.
SEM-EDS and infrared spectroscopy analysis showed that the upper layer of the self-layered coating film was fluorosilicon modified PAA, the bottom layer was PU/EP, and there was a transition coating in the middle, and the - COOH, - OH and epoxy groups in the two resins of the transition layer reacted to make the whole coating more stable
.
After 40 days of immersion in 3.
5% NaCl solution by EIS analysis, the corrosive medium did not penetrate the coating film to reach the substrate-metal interface
.
AkzoNobel recently used biomimetic technology to introduce MoodPaint, a color-shifting paint that contains a modified thermogenic liquid crystal that responds to the pheromones of the nearby body, absorbing or reflecting different wavelengths of light waves to present different coating colors
as the crystals move.
MoodPaint is a smooth eggshell white that can start working within hours, seamlessly changing color
whenever someone is in the room.
Studies have long shown that colors may have an impact on human mood and behavior, soft blues can soothe hospital patients, vibrant yellows can stimulate your appetite in the kitchen, and neutral colors can make people feel comfortable
in living areas.
MoodPaint enables one paint to bring multiple colors to your
heart's content.
Coating biomimetic technology has great potential and opportunity, under the inspiration of natural biology, coating science will appear many new research fields, in the future there will be more high-performance, high-function, high-intelligence coating technology to succeed
.
Source: Paint Show & Surface Treatment
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.
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.
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