Epoxy resins are generally used at the same time as additives to obtain application value. Additives can be selected according to different uses, commonly used additives are curing agent, modifier, filler, diluent, other.
Among them, curing agent is an essential additive, whether it is used as adhesive, coating, castable, it is necessary to add curing agent, otherwise the epoxy resin can not cure. Due to the different performance requirements, there are also different requirements for epoxy resins and additives such as curing agents, modifiers, fillers and diluents.
First, the choice of epoxy resin
1, choose from the use
As a adhesive, it is best to choose a resin with a medium epoxy value (0.25-0.45), such as 6101, 634; As a castable, it is best to choose a resin with a high epoxy value (0.40), such as 128, 6101; The general selection of low epoxy value (<0.25) resin for coating, such as 901, 904, 907, 909, etc.
2, choose from the mechanical strength
The resin with high epoxy value is stronger but more brittle. The strength of epoxy is good at medium high and low temperature. The strength of low epoxy value is worse at high temperature. Because the strength is related to the degree of crosslinking, the crosslinking degree after high epoxy value curing is also high, and the crosslinking degree after low epoxy value curing is also low, so the difference in strength is caused.
3, choose from the operation requirements
Do not need high temperature resistance, the strength requirements are not large, hope that the epoxy resin can dry quickly, not easy to lose, can choose a low epoxy value of the resin; If you want better permeability and strength, you can choose a resin with a higher epoxy value.
Second, the choice of curing agent
1, curing agent type:
Commonly used epoxy resin curing agents are fatty amines, ali