It can be seen from the above that organosilicon leveling agents have different modification methods, different modified materials, different structures, different molecular weights and different uses. So pay attention to the following points in application. According to the problem, choose leveling agent silicon leveling agent, which can not solve all problems. If you don't make the right choice, it will have a negative impact. If you want to eliminate the surface tension difference, it is best to choose the polysiloxane with strong surface tension and polyether modified, rather than the polysiloxane with alkyl modified. It is required to be resistant to high temperature baking. We can't choose polyether modified ones. We should choose alkyl modified ones or polyester modified ones. It is required to be smooth for a long time, and it is not allowed to choose the additive. It is required to choose the reactive type, improve the interface relationship and reduce the interface tension. It is better to choose a small molecular weight polyether modified base material wetting agent. The problems of interlayer adhesion such leveling agents have been improved through modification, compatibility and adhesion, but some of them still have problems. For leveling agents with poor mobility, it is easy to have problems when the second layer is applied after the coating is completely dry and hard. In addition, overheating baking destroys the structure of leveling agent and causes adhesion problems. The silicone leveling agent with good mobility and no active group at the end of modifier should be selected. The most famous moneng-1071 leveling agent has good mobility. After coating the second layer, it quickly migrates from the surface of the first layer to the surface of the second layer. There is no leveling agent film between the two layers, so it does not affect the adhesion between layers. Moneng-1071 has strong ability to control surface state, high smoothness, good versatility and high cost performance. In addition, low molecular weight leveling agent can also be selected to improve the adhesion. Because short chain siloxane is not easy to form continuous film at the gas / liquid interface, the contact area between the top coat and the primer is increased, and the adhesion between layers is improved. The higher the surface tension is, the stronger the foam stability is. Especially, the polyether modified polysiloxane is easy to be oriented at the gas / liquid interface. The air in the coating is "wrapped" by the leveling agent to form bubbles. Special attention should be paid in application, and unstable foam or low stable foam can be selected. Moneng-7003 is a low stability foam product. Reduce the surface tension and wet the substrate. When the thermal stability is used in the heating fixed line coating, it is necessary to pay attention to the heat-resistant range of leveling agent, and the baking temperature shall be within the heat-resistant range of leveling agent, otherwise the leveling agent will decompose when it is overheated baking, resulting in negative effects such as shrinkage, difficulty in recoating, and decrease in gloss of the coating film. For primer or two coats of primer, it is better to use alkyl modified polysiloxane without reducing the surface tension. For top coat, polyester modified polysiloxane can be used, such as moneng-1060. The dosage and the dosage of the adding method should be determined according to the needs. The total recommended dosage is 0.01% - 1.0% of the paint quantity, which is appropriate. It depends on the factors such as the composition of the formula, the dissolving power of the solvent, the compatibility of the resin, the interaction between the auxiliaries and so on. The effect is not obvious when the dosage is insufficient. If the dosage is too high, fine wrinkles and even shrinkage will occur. So the dosage must be moderate. Silicone leveling agent and acrylate leveling agent are preferred for finishing coat and varnish, for example: moneng-1071 + moneng-1152. Moneng-1071 organosilicon leveling agent was diluted to 12.5% and 0.3-0.5%, moneng-1152 and 0.2-0.3% respectively. In order to eliminate brush marks and roller marks, it is better not to use leveling agent to reduce the surface tension. Acrylic leveling agent or alkyl modified leveling agent can be used. It is helpful to keep the surface tension of the coating as much as possible. The addition amount of 0.3-0.5% can also be used together with solvent leveling agent. Other leveling agents are fluorocarbons and high boiling solvents. Fluorocarbon leveling agent has the highest surface activity, can reduce the surface tension of the coating to 16-18mn / m, so it has the strongest surface state control ability. Generally speaking, the function of organosilicon leveling agent, fluorocarbon leveling agent, is better than organosilicon leveling agent in reducing surface tension, and the effect of surface state control is better. But it also has its negative effects, such as interlayer adhesion, foam stability is more difficult to overcome. Its price is also very expensive, which affects its application. Solvent leveling agents are mostly mixtures of high boiling point solvents. The main mechanism is to slow down the evaporation rate of solvents, reduce the viscosity of coatings, and improve the leveling agent. But it is against the requirements of environmental protection, anti sagging control and quick drying, so people do not use it much