aochengchem: The nature of crosslinking agent

Crosslinking agent is a kind of can plays a role of bridge between the linear molecule, allowing multiple linear molecules mutual couplet net structure of bonding material.Promote or adjustment between polymer molecular chain covalent bond or electrovalent bond formation of the material.Crosslinking agent in different industries have different name, such as: used in rubber industry is called "vulcanizing agent";In the plastic industry known as "curing agent, curing agent, curing agent;In adhesive and coating industry known as "agent" and "curing agent", etc.Despite the difference in the above address, but reflects the chemical properties and mechanism of are the same.
Often is material containing multiple functional groups in the molecule, such as organic dibasic acid, polyol, etc;Compounds or molecules contains more unsaturated double bond, such as divinylbenzene and diisocyanate, N, N - methylene double acrylamide (MBA), etc.But with monomer feeding, polycondensation (or aggregate) to a certain degree of crosslinking, make the product into insoluble cross-linked polymer;Also can keep a certain number of functional groups in linear molecules (or double bond) and then add certain substances to crosslinking, such as the curing of phenolic resin and rubber vulcanization, etc.