Main properties of Teflon coating Teflon high-performance special coating is a fluorine coating based on polytetrafluoroethylene matrix resin, the English name is Teflon, because of the pronunciation, it is usually called Teflon, Teflon, Teflon, Teflon, etc. (all are translations of Teflon). Teflon coatings are a unique, high-performance coating that combines heat resistance, chemical inertia, excellent insulation stability and low friction, with a combination of advantages that no other coating can compete with, and its flexibility of application allows it to be used on almost all shapes and sizes of products. Teflon is divided into PTFE, FEP, PFA, ETFE several basic types. Application scope of Teflon coating: all kinds of cooking utensils, textile guide roller, textile drying cylinder, feed hopper, heat exchanger, industrial washing machine drum, all kinds of chemical reaction equipment (reaction kettle, stirrer, pump valve, etc.), offshore oilfield equipment, bridge bolts, auto parts, etc. Teflon coating characteristics 1.Non-adhesive: Teflon spray coating almost does not bond with any substance, only need to spray a thin layer of coating on the surface of the appliance can show a good non-adhesive performance. Therefore, Teflon is sprayed on baking utensils, baking pans and molds for food processing. When coated with Teflon, these appliances facilitate demoulding, resulting in a more consistent pastry shape. At the same time, the service life of these Teflon coated appliances is extended. 2.Thermal stability: Teflon film has excellent heat and low temperature resistance. It can withstand high temperature to 300 ° C for a short time, generally can be used continuously between 180 ° C and 200 ° C, and has significant thermal stability, it can work at freezing temperatures without embrittlement, and does not melt at high temperatures. Therefore, the Teflon spraying process can be added to the flue and porous plate in the electronics industry, the rice cooker, microwave oven and oven in the home appliance industry, and the mechanical container and cooling equipment in the chemical industry. 3.Sliding: Teflon film has a low coefficient of friction. When the load slides, the friction coefficient changes, but the value is only between 0.05 and 0.15. 4.Moisture resistance: the surface of Teflon coating is not wet and oily, and it is not easy to stick to solution during production operation. If there is a small amount of dirt, it can be removed by simply wiping. Short downtime saves time and improves work efficiency. 5.Wear resistance: under high load, has excellent wear resistance. Under a certain load, it has the dual advantages of wear resistance and non-adhesion. 6.Corrosion resistance: Teflon spray coating has a strong inertia, in addition to individual media, can resist a variety of acids, alkali, salt and organic matter (solvent), Teflon is almost free from any chemical attack, can protect parts from any kind of chemical corrosion. Therefore, i...

In the use of pesticides, only a few cases are the direct use of the original drug, and most of the cases are mixed with other additives and solvents to improve its use value and reduce the cost of use. Surfactant is a kind of additives that can give greater play to the value of pesticides and reduce the cost of pesticides. It plays the role of emulsification, foaming/defoaming, dispersion and wetting, and has been widely used in pesticides. Surfactants can improve the interfacial tension between the components in the emulsion and form a uniform and stable dispersion system. The surfactant structure has both hydrophilic and oil-philic groups, which adsorbed on the oil-water interface, can reduce the interfacial tension and reduce the energy required to form the emulsion, so as to improve the stability of the emulsion. The effect of emulsified pesticide is better than that of other pesticide formulations when the active ingredient of pesticide is dispersed in water in a small state. Emulsifiers directly affect the stability of pesticide emulsion, and then affect the efficacy. Different droplet sizes of pesticides have different stability: when the pesticide particles < 0.05μm, in water is solubilized state, more stable; When pesticide particles are 0.05 ~ 1μm, they are basically dissolved in water and remain relatively stable. When the pesticide particles are 1 ~ 10μm, there are some large particles in the water, and after a certain time there will be precipitation or precipitation; When pesticide particles are more than 10μm, they are obviously suspended in water and are extremely unstable. With the change of pesticide structure, some highly toxic organophosphorus pesticides are gradually replaced by some safe, efficient, low toxic and complex chemical structure pesticide varieties. Some heterocyclic compounds, especially nitrogen-containing pyridine, pyrimidine, pyrazole, thiazole and triazole, are solid and have low solubility in conventional solvents, so new, high-efficiency and low-toxicity emulsifiers are needed to emulsify new pesticides.

Classification of surfactant applications in coatings: According to the role of the classification, the coating industry used surfactants can be divided into the following categories: emulsifier, pigment surface treatment agent, pigment wetting dispersant, defoamer, levelling agent, anti-mold, fungicide, antistatic agent, brightening agent, slippery agent and so on. Application of surfactants in coating industry - Antistatic: Antistatic agents are surfactants that leak electrostatic charges through different channels or reduce the friction factor to inhibit the generation of electrostatic charges. It is generally required to have the following characteristics: ①Prevent electrostatic effect ②Prevent lasting electrostatic effect ③It has good miscibility with film forming material ④Does not affect the other properties of the paint, such as does not make the film yellowing. The principle of antistatic agent is: the use of its cationic surface activity characteristics, adsorption of water in the air, so that its own polarization, the formation of an extremely thin conductive layer on the surface, forming a static leakage channel, so its effect depends on its own structure and the relative humidity of the environment. The application of surfactants in the coating industry - leveling: To use leveling agents to improve the leveling of coatings, the following two factors can be considered 1, the selection of active agents that can reduce the surface tension of the coating/coating film to greatly improve the leveling of the coating. 2, choose a solvent that has a slow volatilization rate and can reduce the viscosity of the paint construction, improve the fluidity of the paint, extend the leveling time, and achieve the final leveling.

Teflon is the abbreviation of polytetrafluoroethylene, this material has the characteristics of acid and alkali resistance, resistance to various organic solvents, almost insoluble in all solvents, so it has the title of "non-stick coating". With the development of thermal spraying technology, Teflon coatings can be applied to stainless steel, copper, aluminum, magnesium and various alloy metal materials, but also can be applied to glass, rubber plastic and other non-metallic materials. So, today we are going to introduce, what are the characteristics of Teflon coating? 1.Non-viscous: the coating surface has a very low surface tension, so it shows relatively strong non-viscous, and few solid substances can stick to the coating. 2.Wear resistance: under high load operation, has good wear resistance. 3.corrosion resistance: Teflon is less affected by the chemical environment, can withstand most of the action of organic solvents, can protect parts from chemical corrosion. 4.High temperature resistance: the coating has strong high temperature resistance and fire resistance, high temperature resistance to 300 ° C for a short time, generally between 240 ° C and 260 ° C can be used continuously, with significant thermal stability, but also unexpectedly very low thermal conductivity. 5.Moisture resistance: the coating surface is hydrophobic and oleophobic, and it will not be easy to dip into the solution during production operation. Even if there is a small amount of solution dirt, it can be simply wiped, convenient to clean and save production time. 6.Slippability: polytetrafluoroethylene film has a low friction coefficient. When the load slides, the friction coefficient changes, but the value is only between 0.05 and 0.15. With the continuous improvement of thermal spraying technology, the performance of the coating prepared is also constantly improving, and the excellent performance of Teflon coating is widely used in national defense, aerospace, electronics, electrical, chemical, machinery, instruments, meters, construction, textile, metal surface treatment, pharmaceutical, medical, food, metallurgical smelting and other industries, which has become a spraying technology that cannot be ignored.