Zhongshan Epoxy Floor Paint Usage Impact

In the coatings industry, the use and status of epoxy coatings are mostly classified.

 1. The composition of Zhongshan Epoxy Floor Coating epoxy coating is composed of epoxy resin, epoxy ester, synthetic resin for modification and curing, and the above components are collectively referred to as base material, curing agent, coloring pigment and body pigment. Solvents include water, various functional additives and other materials. Its main material has the following effects on the use of epoxy coatings.

 2. Base material The base material in floor paint is an important film-forming material. Commonly used types of base materials in addition to the base material epoxy resin, there are phenolic resin, amino resin, silicone resin, acrylic resin, polyurethane resin, polysulfide rubber, liquid polybutadiene, liquid nitrile rubber, sterol resin, Coal asphalt and other auxiliary base materials. Epoxy resin and auxiliary bases are scientifically and reasonably coordinated to prepare epoxy coatings with various properties. Special note that when the epoxy group contains an electron-withdrawing group, the reaction rate with the Lewis base nucleophile curing agent will increase, and the reaction rate with the Lewis acid electrophile curing agent will decrease; the epoxy resin molecule contains When the electron group is used, the reaction speed with the Lewis acid curing agent increases, and the reaction rate with the Lewis base curing agent decreases. Mastering and controlling the reaction rate between epoxy resin and curing agent is one of the key technologies that determine the coating properties and usability of epoxy coatings. Different structures of epoxy resin should be determined according to different application requirements.

3, curing agent Curing agent structure and reactivity of the epoxy coating curing reaction rate play a decisive role. For example, in the addition cure reaction, aromatic amine adduct, 300 phenol/formaldehyde and amine condensate can quickly cure the epoxy resin at low temperature; No. polyamide cures slowly with epoxy resin at low temperature; anhydride And its derivatives can fully cure with epoxy resin at higher temperatures. E-44 epoxy resin was used as the base material, and the amine equivalent weight: epoxy equivalent weight = 0.6:1. The curing reactivity of several amine curing agents was measured at 10-12°C.

 4, pigment filler In epoxy enamel paint, pigment filler is an indispensable component. It is worth noting that the amount of the front filler has an effect on the internal stress of the coating. In coatings, increasing the amount of Qinbai and zinc oxide will increase the elastic modulus of the coating, increase the internal stress, and decrease the bond strength; increasing the amount of aluminum powder and talc powder will inhibit the volume shrinkage of the coating and increase the elastic modulus. Basically no effect on internal stress, and improve the role of coating film bonding strength. Several commonly-used pigment fillers make the internal stress of the coating order: titanium white = zinc oxide> barium sulfate> calcium carbonate> talc powder = aluminum powder. The internal stress of the epoxy coating film increases as the amount of zinc oxide increases, and the bonding strength of the coating film increases as the amount of zinc oxide increases. Tests have shown that when the internal stress of the coating exceeds the bond strength, the coating film will peel; when the internal stress exceeds the cohesion, the coating film will crack.

5. Additives in auxiliary epoxy coatings include curing accelerators, thixotropic agents, leveling agents, defoamers, flame retardants, plasticizers and coupling agents, among which the greatest impact on the curing reaction rate It is a curing accelerator. When the epoxy resin in the epoxy coating reacts with the curing agent, the structure and the amount of the curing accelerator used have a great influence on the curing reaction rate. When the steric hindrance of the curing accelerator is increased, it is not conducive to the curing reaction; an increase in the amount of the curing accelerator will accelerate the curing reaction rate. Liquid bisphenol A type epoxy resin: Polyfunctional epoxide-hydrogen sulfide adduct = 100:75 mass ratio, a tertiary amine was used as a curing accelerator, and the curing reaction was carried out at 25C. With liquid bisphenol A type epoxy resin: polythiol = 100:60 mass ratio, DMP-30 was used as a curing accelerator, and the curing reaction was performed at 25°C. The effect of the amount of DMP-30 on gel time is shown in the following table. . Table 1 shows the parts by mass of the curing accelerator added per 100 parts by mass of the epoxy resin.

6. Solid Solvents Most of the solvents used in epoxy coatings are made by mixing two or more organic solvents. It is also called as diluent for diluents.