General knowledge of coatings: development and application of nano modified coatings

Core tip: with the rapid development of China's economy, construction industry has become one of the main industries in China With the improvement of people's living standards, the past building conditions are far from meeting people's needs In many people's needs, architectural coatings play an important role Since the beginning of the 21st century, building coatings are required to have better durability, low pollution, antibacterial and antifouling properties, which pose a huge challenge to the current building coatings and construction technology in China Therefore, the development and application of high-level architectural coatings and construction technology has become a lot of today Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Home of coatings news: with the rapid development of China's economy, the construction industry has become one of the main industries in China With the improvement of people's living standards, the past building conditions are far from meeting people's needs In many people's needs, architectural coatings play an important role Since the beginning of the 21st century, building coatings are required to have better durability, low pollution, antibacterial and antifouling properties, which pose a huge challenge to the current building coatings and construction technology in China Therefore, the development and application of high-level architectural coatings and construction technology has become a research hotspot in many disciplines With the rapid development of nanotechnology and nanomaterials, nanomaterials have been applied to all aspects of the construction industry, such as mixing concrete, cement, paint and other basic materials, transforming the development of the traditional construction industry, so that building materials have a new function and mission Nano modified coatings with different functions not only have various superior properties of traditional coatings, but also have many new functions, such as antibacterial, self-cleaning, antistatic, stealth, air purification, high transparency and so on If nano modified coatings are classified according to their functions, they can be divided into the following categories 1.1 nano antibacterial coating nano antibacterial materials have been widely used in fibers, plastics, ceramics and electrical appliances, to kill E.coli, Staphylococcus aureus and other bacteria and viruses The interior wall coating and the coating used for various instruments and furniture surface, due to the frequent contact of hands, there will be a large number of bacteria and viruses on its surface, which is easy to cause cross infection, so it is necessary to develop nano modified antibacterial coating At present, nano materials with good antibacterial properties mainly refer to nano-TiO2, nano ZnO and nano silver materials 1.2 nano modified waterproof coating to improve the special nano interface coating has excellent anti-corrosion and self-cleaning function, which is a very important coating variety, especially in the field of metal anti-corrosion According to statistics, the quality of steel products discarded due to corrosion every year in the world is about 1 / 3 of the steel output, of which about 10% of the annual output is turned into rust, which is a huge loss to resources and energy Therefore, how to use science and technology to prevent, control or reduce the corrosion of steel materials economically and safely is of great significance to the economic construction and development of our country 1.3 the weatherability of anti-aging nano coating is one of the development directions of exterior wall coating Nano scale pigment and filler particles can absorb ultraviolet rays, so this kind of material can play the role of ultraviolet absorber, and can effectively enhance the anti-aging performance of the coating Nano ZnO, SiO2, TiO2, Fe2O3, CaCO3 and other particles have special optical properties that large particles do not have, and there is a common phenomenon of "blue shift" Adding them to the coating can form a shielding effect on the coating, so as to achieve the purpose of anti ultraviolet aging Nano-TiO2 can be added to the coating according to a certain proportion to produce a special anti ultraviolet product, nano coating Nano materials can enhance the adhesion between the coating and the substrate, make it have the effect of anti discoloration, and make the coating itself become a kind of decoration material Adding a certain amount of Nano-SiO2 in the coating can also play a good role Nano SiO2 is a kind of amorphous white powder material, which has good optical properties such as UV absorption and infrared reflection Its absorption and reflectance for UV with wavelength below 400mm and infrared with wavelength above 80mm is up to 70% There are a lot of unsaturated bonds in the molecular structure of Nano-SiO2 The existence of these unsaturated bonds shows a strong activity and can absorb some colored particles, which to some extent reduces the pigment attenuation produced by the coating under UV irradiation The influence of nano materials on the performance of coatings 2.1 the influence of nano-SiO2 on the performance of coatings after adding a proper amount of Nano-SiO2 into the interior and exterior wall coatings of buildings, the anti ultraviolet and anti-aging performance of the conventional coatings is more than 2.5 times higher than before, and the anti scrubbing performance is more than 10 times higher than before The addition amount of Nano-SiO2 in the interior and exterior wall coating is generally 0.1% ~ 1%, and the maximum is no more than 5% Nano-SiO2 has a very strong UV shielding property, the UV shielding rate of long wave black spot effect reaches 88%, while the UV shielding rate of medium wave red spot effect is 85%, and the UV short wave shielding rate of sterilization is still 70% - 80% (due to the low penetration of this short wave), so nano-SiO2 can play a role in shielding various UV rays in the coating, so as to achieve the anti UV aging and anti UV Purpose of thermal aging 2.2 compared with conventional materials, nano-TiO2 has several unique properties: ① large specific surface area; ② strong magnetism; ③ good light absorption and UV absorption ability; ④ large surface activity; ⑤ good thermal conductivity; ⑥ good dispersion and stable suspension Because of its many excellent properties, nano-TiO2 has a broad application prospect in the field of coatings The application environment of architectural coatings, especially the exterior wall coatings, is very bad Ultraviolet, thermal energy, microorganism, water, air pollutants and so on can cause the aging of polymers in the coatings, among which ultraviolet aging is the most destructive Therefore, the key to improve the weatherability of coatings is how to reduce the degradation of UV 2.3 the influence of nano ZnO on the properties of coatings Nano ZnO is also an excellent anti-aging agent added in the coatings Adding a certain amount of nano ZnO in the coating can obviously improve the anti-aging properties of the coatings Nano ZnO absorbs ultraviolet radiation more effectively than other nano materials It has good shielding effect on both the long wave black spot effect ultraviolet and the middle wave erythema effect ultraviolet, so it is very suitable for the anti-aging agent in coatings According to Japanese patent report, Kondo gang and other researchers have successfully developed a UV shield coating for glass using a certain amount of ZnO as glass additive The US FosterProducts company uses nano ZnO to produce an anti-aging coating, and its anti-aging performance is 15 times that of conventional coatings Another company in the United States has successfully prepared a UV resistant premix with certain solvents, resins, catalysts, etc by using the nano ZnO of foster products This premix can be used as a crucial part of paint and plastic formulations 2.4 the influence of nano clay on coating performance clay is a kind of "one-dimensional" nano material, so its specific surface area is higher than other nano materials, up to 700-800m2 / g Clay is also widely used as an additive in composite materials According to the different amount of clay added in composite materials, the following products can be made: conventional composite materials, intercalation composite materials and stripping composite materials The mechanical and thermal properties of the coating can be greatly improved by adding appropriate amount of clay When clay is modified and then added to the coating, not only the flexibility and impact resistance of the coating can be improved, but also the optical properties of the coating can be improved to a certain extent Conclusion coating is a complete set of industrial products, which has a wide range of applications It can be said that any kind of industrial products are inseparable from coatings The 21st century is the era of information industry, and coatings have new application fields For example, the electroluminescent element clamps the phosphor material between two electrodes When an AC / DC bias electric field is applied, the phosphor electrons are impacted and sent in the form of energy transfer It is divided into non electromechanical light-emitting elements and electromechanical light-emitting elements This element has the advantages of cold light, no heat, no UV damage, less power consumption, waterproof, anti humidity, anti vibration, anti impact, many kinds of light and color, uniform light emission, adjustable strength and long service life It can be used in computers, household appliances, equipment and instruments The insulating layer of this kind of electroluminescent element needs to use coating and will use a large amount in the future, so it is a good development and development field of coating Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,