A B-stage resin is one in which a limited reaction between resin and hardener has been allowed to take place, and the reaction arrested while the product is still fusible and soluble, although having a higher softening point and a more limited solubility than originally. A B-stage resin contains sufficient hardener to effect curing on subsequent heating. The term “B-stage” is one of long standing in connection with phenol formaldehyde resins, where it has a similar, but not a corresponding meaning.
The first epoxy B-stage resin to attract attention was that formed by meta-phenylenediamine, but under controlled conditions it is possible to form B-stage products from a number of bisphenol A resins and hardeners. The most important B-stage resins are produced by using aromatic polyamine hardeners, the B-stage being created by heating the reactants together to bring about a homogeneous state and then cooling.
Wood adhesive, rubber adhesive, plastic adhesive, remove adhesive, steel adhesive, traditional adhesive, thermosetting resin, water base adhesive, inorganic base adhesive, many glues.
Sunday, October 15, 2017
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