(1) The advantages of the epoxy resin adhesive are as follows.
1 Epoxy resin molecules contain polar groups such as epoxy groups, hydroxyl groups, amino groups, ether bonds, and ester bonds, so they have strong adhesion to many materials.
2 The shrinkage rate of the adhesive layer during curing is small, generally 2% to 3%. If a suitable filler is added, it can be reduced to about 1%, so the bonding member is stable in size and creep is small. The cured epoxy resin retains its original shape and size under long-term stress.
3 good craftsmanship and easy to use. This adhesive has good mixing, wetting and permeability. It is easy to cure, can be cured at room temperature, or can be cured at high temperature. It can be formulated into a solvent-free compound, and no low molecular by-products are released during curing, so that no pressure curing is required.
4 The adhesive layer has excellent electrical insulation, the volume resistivity is 1013?1016?? cm, and the breakdown voltage is 3550kV/mm.
5 can be made into adhesives for various purposes, with a wide temperature range. The general use temperature is -60 to 150 °C.
6 raw materials are easy to obtain, and the price is low.
7 The blending property is good, and it can be modified by blending other resin and elastomer polymer with other resin or polymer to form a polymer alloy and incorporating the filler.
(2) The disadvantages of the epoxy resin adhesive are as follows.
1 Unmodified epoxy resin is brittle and has low peeling strength. Since the epoxy resin contains a lot of benzene rings and heterocyclic rings, the molecular chain has low flexibility, and the body structure after curing is not easily deformed, so the brittleness is large.
2 After the preparation of the epoxy glue generally has a short period of use, and some systems use a latent curing agent, but still need to be stored at low temperatures.
3 Individual epoxy resin, reactive diluent and curing agent have certain damage to human tissues.
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