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.

In the face of different needs of different industries, rollers also need to do the corresponding coating treatment, so as to improve or compensate the relevant performance of the roller. So what are the surface coating technologies for rollers? 01 Coating treatment The coating treatment of the drum includes zinc plating, chromium plating, nickel plating, etc. The different coating treatment can improve the hardness, corrosion resistance, oxidation resistance and wear resistance of the drum surface. It should be noted that the thickness of these coatings will also affect the performance of the roller. 02 Teflon coating Due to the characteristics of Teflon, the roller coated with Teflon has good high temperature resistance and anti-viscosity. Such rollers are easy to clean and can be widely used in the medical food industry. 03 Spray Painting The roller surface spray paint treatment can make the roller obtain a certain beauty. At the same time, this layer of surface coating can also play a certain role in delaying the oxidation rate of the roller surface. 04 Tungsten carbide treatment By high temperature plasma spraying technology, the roller surface formed a hard tungsten carbide coating. This coating has excellent wear resistance, but also has good high temperature resistance, corrosion resistance, so tungsten carbide roller in all kinds of machinery manufacturing, aerospace, automotive industry and other fields are also widely used. 05 Ceramic coating Ceramic coating has high hardness, wear resistance, chemical stability and other excellent properties, to provide an impenetrable protective layer for the drum, so that it is protected from corrosion and oxidation. Due to the high temperature resistance of the ceramic coating, the ceramic roller can be applied under high temperature conditions. 06 Hard oxidation Hard oxide film usually acts to enhance the surface hardness, wear resistance and other properties of the drum, thereby extending the service life of the drum. At the same time, it also has the effect of changing the surface color of the drum and improving the appearance of the drum. Therefore, the surface coating of the drum has many benefits, and their common goal is to increase the practicality of the drum, thereby improving production efficiency. For the choice of roller surface coating, it is also necessary to consider many factors. If you are confused about the coating choice of the roller, please contact Sinograce Chemical. As a non-stick coating manufacturer,Sinograce Chemical has been focusing on the manufacturing of industrial roll coating for many years, and can provide you with the best roll non-stick coating manufacturing solution.