Coating technology: formulation design and preparation of epoxy silicone high temperature resistant coating

Core tip: with the development of modern industry, military, aerospace technology and so on, the applied steel has higher and higher strength and is more sensitive to impurity ions At higher temperatures, the corrosion of steel is faster In order to avoid steel failure, it is an effective method to use high temperature resistant coating for protection It is widely used because of its convenient construction and low cost High temperature resistant coating generally refers to the coating whose film does not fall off above 200 ℃ and can still maintain proper physical and mechanical properties The protection mechanism can be roughly classified into two types: one is to utilize the densification of the coating Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: with the development of modern industry, military, aerospace technology, etc., the steel used is getting stronger and stronger, and the higher the strength, the more sensitive to impurity ions At higher temperatures, the corrosion of steel is faster In order to avoid steel failure, it is an effective method to use high temperature resistant coating for protection It is widely used because of its convenient construction and low cost High temperature resistant coating generally refers to the coating whose film does not fall off above 200 ℃ and can still maintain proper physical and mechanical properties The protection mechanism can be roughly divided into two types: one is to prevent the corrosion medium outside the coating from invading the substrate by using the compactness of the coating; the other is to rely on the anti-corrosion pigments and fillers to inhibit the corrosion These two functions complement each other and play a protective role together Common organosilicon high-temperature coatings mainly focus on high-temperature resistance, but there are problems such as poor adhesion and corrosion resistance, and some special high-temperature equipment require very strict anti-corrosion performance of high-temperature coatings Therefore, when designing the formulation of high temperature resistant coating, it is necessary to consider the mechanical properties, heat resistance and corrosion resistance of the coating film For the preparation of coating / coating, zinc phosphate, talcum powder and other fillers and additives should be added into the resin, stirred evenly, then ground to the specified fineness with a sand mill, added with solvent to disperse and filter, so as to obtain one component of the finished coating; the two components are polyphthalamine resin; Component 3 is aluminum powder The weight ratio is 100:3-10:10-20 The preparation of coating includes substrate treatment, coating construction and coating curing Substrate treatment: remove oil and rust with organic solvent, then clean and dry with solvent Coating construction: each component of the coating shall be prepared according to the specified proportion, stirred evenly, brushed on the construction horse iron plate in the air spraying area, and the next construction shall be carried out after the surface is dry The coating thickness is controlled from 40 pm to 80 PM Coating curing: put the constructed tinplate in the oven, raise the temperature to a certain temperature, take it out after a certain period of time, cool it to room temperature, and conduct performance test The heat resistance shall be tested according to GBT / 1735-2009 Put the test piece of tinplate coated with high temperature resistant coating into muffle furnace, and rise from room temperature to phosphate pigment, etc We choose zinc phosphate and aluminum tripolyphosphate to test, and the two phosphates have little effect on the heat resistance of the coating Zinc phosphate mainly inhibited the initial corrosion, while aluminum tripolyphosphate inhibited the corrosion The corrosion resistance of the coating can be improved by using the synergistic effect of the two Figure 1 shows the effect of phosphate content on the salt spray resistance of the coating In this study, talcum powder, mica, precipitated barium sulfate and light calcium carbonate were used as fillers According to the characteristics of pigments and fillers, the commonly used pigments and fillers with stable quality and performance were selected, and the amount and proportion of fillers were determined through experiments After coating construction, due to the different diameter thickness ratio and treatment method of aluminum powder flakes in the aluminum powder slurry, although there is a certain orientation in the coating, there is still a large proportion of the arrangement direction is inconsistent, which will reduce the compactness of the coating and the barrier to impurity particles Using a certain amount of aluminum powder oriented agent can improve the orientation of aluminum powder scale, improve the compactness and temperature resistance of the coating When the dosage of powder orientation agent is y2c 0, the coating performance is the best If the dosage continues to increase, the improvement of coating performance is not obvious, but it will increase the viscosity of coating, which is not conducive to coating construction Other auxiliaries in this study, in addition to the aluminum powder oriented agent, in order to make all kinds of fillers better dispersed in the resin and improve the adhesion of silicone coating to the substrate, the wetting dispersant was selected; the leveling agent was selected to improve the surface state of the coating; the defoamer was selected to improve the production state of the coating; and so on The coating has been applied to engine parts made of high strength steel The results show that the coating process performance is good, the temperature resistance meets the requirements, the mechanical properties and corrosion resistance are excellent, and the comprehensive properties meet the use requirements Conclusion a kind of epoxy silicone high temperature resistant aluminum powder coating with good physical and mechanical properties and corrosion resistance can be prepared with epoxy silicone resin as the main film-forming material, proper curing agent and functional pigment Aluminum powder can improve the high temperature resistance and compactness of the coating, and the amount of 10% - 20% is appropriate; aluminum powder directional agent can improve the arrangement of aluminum powder, so as to improve the hardness, compactness, temperature resistance and protective performance of the coating, and the effect is the best when the amount of y2c0 is used The composite phosphate can improve the salt spray resistance of the coating, and the salt spray resistance of the coating increases with the increase of phosphate content When the content of phosphate is 10% - 20%, the comprehensive properties of the coating are better 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,