Formulation design has a huge impact on waterborne epoxy coatings
Experts said that through the choice of epoxy resin, waterborne epoxy curing agent, pigment filler and various additives, aqueous epoxy resin coatings with different properties can be prepared. When formulating waterborne epoxy resin coatings, two considerations need to be considered. Factors: First, the equivalent ratio of epoxy resin and waterborne epoxy curing agent, the second is the choice of pigments, and the third is the choice of additives. These three factors are considered well and the formula design is successful.
Equivalent ratio of epoxy resin and waterborne epoxy curing agent is the primary factor. Experts from the China Epoxy Resin Industry Association said that there are differences in the types of water-based epoxy resin coatings used in this area: For type I water-based epoxy resin systems, water-based epoxy curing agents are used to directly emulsify low molecular weight Liquid epoxy resin, the system has a higher surface activity of the segment, the appropriate increase in the equivalence ratio between the two, can significantly reduce the coating's water resistance and hardness, generally controlled in the range of 5 to 10% higher than the theoretical value Inside. For other types of aqueous epoxy resin systems, if the amount of epoxy resin is appropriately increased, it will help improve the water resistance and corrosion resistance of the coating because epoxy resins are lipophilic and waterborne epoxy curing agents. The hydrophilicity is relatively strong, and an appropriate amount of water-based epoxy curing agent can improve the lipophilicity of the system. In some cases, if an excessive amount of epoxy curing agent is used, the curing speed and cross-linking density of the coating film can be improved, thereby improving the solvent resistance, stain resistance, adhesion, drying speed, etc. of the coating film. This can be adjusted according to the specific application.
According to the application requirements of the water-based epoxy resin coating to choose the right pigment filler. Experts from the China Epoxy Resin Industry Association pointed out that in the case of acid and alkali resistant media, pigments such as red iron oxide and precipitated barium sulphate can be used. For applications where light and heat resistance are required, zinc oxide and micaceous iron oxide can be used. Filler; If you want to increase the chemical resistance of the coating and improve its mechanical properties, you should choose fillers like mica and talc. Of course, considering that the water-based epoxy curing agent is weakly alkaline, acidic pigment fillers should be avoided, so as to avoid demulsification and delamination after the two components are mixed. Waterborne epoxy resin coating is a two-component coating. Pigment fillers can be added to the epoxy resin emulsion component or added to the waterborne epoxy curing agent component. However, for ease of use, the pigment filler should be added. The comparison of the equivalents of the two components is close.
Auxiliaries are one of the indispensable components in the production, storage and construction of waterborne epoxy resin coatings. It is necessary to make full use of the role of various additives in the coating and the final coating performance, and to use various additives in a targeted manner. The additives for waterborne epoxy resin coatings should include coalescents, defoamers, dispersants, rheology modifiers, etc. The specific choice should consider compatibility with aqueous epoxy resin systems to avoid gels and Film floating oil and other defects.
Villa design paint
Piston Ring is a metal Ring used to insert the inner Piston groove,
Piston Ring is divided into two types: compression Ring and oil Ring
1,Compression Ring can be used to
seal the combustion chamber combustible mixture of gas;
2,The oil ring is used to scrape excess oil from the cylinder
Piston ring role includes sealing, oil regulation (oil control),
heat conduction (heat transfer), guide (support) four roles.
Packing Ways:
A. Neutral Packings
B Dwit Brand Packings
C. Meet customers' demand
A. By sea (please let us know your destination port )
B. By air (please let us know your air port )
C. By express (please let us know your detail address , post code )
D. By your agent (if your agent in Guangzhou , we can send to them by free accordingly )
PS: we can supply you detail documents (B/L. CO, CIQ, Commercial invoice, Packing list etc.)
for Customs clearance as you demand
Diesel Piston Rings,83Mm Piston Ring,Piston Ring For Mercedes Ben,Engine Piston Rings
Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.lsjgbearing.com