General knowledge of coating: application of nano silica

Core tip: nano silica is a promising nano material for industrial application Its application field is very wide, almost all the industries that use silica powder are involved In China, the research on nanomaterials started relatively late Only after "nanomaterials" was listed as a major basic project in the eighth five year plan, the research in this area started rapidly and made remarkable achievements In 1996, nano silica was successfully developed and became an important member of nano materials family, which made China become the successor of the United States, Britain, Japan and Germany Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings news: nano silica is a nano material with great industrial application prospect Its application field is very wide, almost involving all the industries that apply silica powder In China, the research on nanomaterials started relatively late Only after "nanomaterials" was listed as a major basic project in the eighth five year plan, the research in this area started rapidly and made remarkable achievements In 1996, nano silica was successfully developed and became an important member of nano material family, which made China the fifth country in the world to produce this product in batch after the United States, Britain, Japan and Germany Nano silica should be widely used 1： In the field of coating, nano silica has a three-dimensional network structure, a large specific surface area, and shows great activity It can form a network structure when the coating is dry, at the same time, it increases the strength and finish of the coating, improves the suspension of the pigment, and can maintain the color of the coating for a long time If nano silicon oxide is added to the interior and exterior wall coatings of buildings, the opening effect of the coatings can be improved obviously The coatings are not layered, with thixotropic, anti sagging and good application performance, especially the anti fouling performance is greatly improved, with excellent self-cleaning ability and adhesion Yao Suowei et al Studied the influence of nano-SiO2 on the performance of polyurethane varnish Because of the large specific surface area of nano-SiO2 particles, it can have strong cross-linking effect with polymer molecules At the same time, because of the small size of nano-SiO2, it can fill the pores in the coating, make the coating more compact, greatly improve the shear force and peeling force of the coating, and increase the adhesion of the coating Moreover, the corrosion potential of the composite paint is shifted positively and the anode corrosion current is reduced by about two orders of magnitude, and the corrosion resistance of the coating is improved significantly Nano-SiO2 as a functional component is added into the coating system to make nano modified coating, which can improve the wash resistance, stain resistance and other properties of the coating, and can give it special functions such as antibacterial, self-cleaning and so on Nano-SiO2 has special optical properties that conventional SiO2 does not have It has strong UV absorption and infrared reflection characteristics Adding nano-SiO2 to the coating can effectively reduce the color difference value of the coating caused by ultraviolet and infrared radiation, which is due to the destruction of C-H, C-C, c-c1 bonds and materials with bond energy in the organic matter, while nano-SiO2 Ultraviolet radiation has a high shielding rate, and the addition of paint can shield ultraviolet radiation, thus improving the anti-aging and weathering resistance of exterior wall coatings 2： In the field of adhesives and sealants in the field of adhesives and sealants, nano silica is an important product with a large amount and a wide range of use At present, domestic high-grade sealant and binder mainly rely on imports According to the introduction, foreign products in this field have adopted nano materials as additives, and nano silicon dioxide is the preferred material Its mechanism is that nano silicon dioxide is coated with organic materials, making it hydrophobic Adding it to sealant can quickly form a network structure, inhibit the flow of colloid, accelerate the solid speed, and improve the bonding effect At the same time Because the particles are small, the sealing property of the adhesive is increased Three: the use of nano silica as reinforcing agent and anti-aging agent in rubber can be applied to rubber products, which can improve the strength, toughness, anti-aging, anti-wear, fire and life extension of rubber products In addition, it can also be used to make transparent rubber sole, which previously all depended on import Four: application in Plastics: adding nano silica in plastics can improve the toughness, strength, wear resistance, aging resistance and anti-aging properties of plastics For example, the high rigidity and toughness nanocomposites obtained by modifying polypropylene plastics (PP) with nano-SiO2 can make automobile bumpers; for example, after adding nano-SiO2 into translucent plastic films, not only the transparency, toughness and strength are improved, but also the water resistance and weather resistance are greatly enhanced; for example, nano-SiO2 is used in organic glass (PMMA) can improve its strength, impact toughness, wear resistance, light transmittance, UV resistance and anti-aging performance 5: with the development of science and technology and the improvement of human living standards in the field of textiles, people put forward comfortable and novel health care requirements for clothing, and various functional textiles came into being Here, nano SiO2 has played a huge role At present, it has been applied to UV protection, far red antibacterial, deodorant, anti-aging and so on For example, the composite powder with the appropriate ratio of nano-TiO2 and nano-SiO2 is an important additive for UV radiation resistant fiber Another important feature of nano added fiber is that it has a strong absorption effect on infrared ray of human body, which can increase warmth retention and reduce the weight of clothes Clothes made of fiber added with infrared absorption nano material powder can reduce the weight by about 30% 6： In the field of antibacterial agents and catalysis, nano-SiO2 has the characteristics of physiological inertia and high adsorption It is often used as a carrier in the preparation of bactericides When nano-SiO2 is used as a carrier, it can absorb antibacterial ions to achieve the purpose of antibacterial and antibacterial It is reported that it can be used in the manufacture of refrigerator shell, computer keyboard, etc Nano-SiO2 with large specific surface area, high porosity and many surface active centers has potential application value in catalyst and catalyst carrier The composite oxide containing nano silica can be prepared by sol-gel technology using nano silica as the basic raw material When the composite oxide is used as catalyst support, it will show unique reaction performance for many structure sensitive reactions The catalytic activity of the reaction is high and the selectivity is good `7： Recently, in the field of agriculture and food, developed countries have developed some new applications of nano silica For example, in agriculture, the use of nano silica to make agricultural seed treatment agent can increase the yield of vegetables (cabbage, tomato, yellow, cotton, corn, wheat) and advance the maturity period For example, nano-SiO2 can be used in herbicides and insecticides If a small amount of Nano-SiO2 is added to the granular insecticide formulation, it will effectively control and prevent the generation of harmful substances In the food industry, nano-SiO2 has many applications, such as adding nano-SiO2 to the food packaging bag, which plays a role in keeping fruits and vegetables fresh; using nano-SiO2 in wine production can purify and prolong the preservation period; it can also be used as a high-efficiency fungicide to control various diseases of fruits and vegetables 8： In the field of lubricating oil additives, the surface of nano silica particles in the field of lubricating oil additives contains a large number of hydroxyl and unsatisfied bonds, which can form a solid chemical adsorption film on the surface of friction pair, and protect the metal friction surface, significantly improve the friction performance of lubricating oil The load-carrying capacity of lubricating oil is greatly improved after the addition of Nano-SiO2 When the addition amount is 1.5, the Pb value increases nearly one time As an additive of lubricating oil, nano-SiO2 particles show excellent antiwear and antifriction performance, and play a certain role in repairing the wear surface In the field of lubricating oil additives, the surface of nano silica particles in the field of lubricating oil additives contains a large number of hydroxyl and unsatisfied bonds, which can form a solid chemical adsorption film on the surface of friction pair, and protect the metal friction surface, significantly improve the friction performance of lubricating oil As a lubricant additive, SiO2 nanoparticles have excellent anti-wear and anti friction properties, and play a certain role in repairing the wear surface 9： In other fields, nano-SiO2 has high surface energy and adsorption properties, good stability and biocompatibility, and can be used as a new sensor The hardness and strength of artificial teeth, as well as SJ properties, can be greatly improved by using the non-toxic, tasteless, pollution-free, candle resistant, reinforced and toughened properties of Nano-SiO2 Nano-SiO2 can be used in brush plating process to improve the mechanical properties and fretting wear properties of the coating; nano-SiO2 can be used as dispersant and flow control agent in ink; it has important applications in skin care products, electronic assembly materials, thermal insulation materials, etc., and even can save energy and protect the environment 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,