Absorbent Resin

The relative molecular weight is uncertain but usually high, and at room temperature it is solid, medium-solid, pseudo-solid, and sometimes it can also be a liquid organic substance. It has a temperature range of softening or melting, has a tendency to flow under the action of external force, and often rupture in the shape of a shell. Broadly speaking, it refers to polymers or prepolymers that are used as plastic substrates. Generally, it is insoluble in water and soluble in organic solvents. According to the source, it can be divided into natural resin and synthetic resin; According to the characteristics of its different processing behaviors, it is divided into thermoplastic resin and thermosetting resin. There are two types of resins: natural resins and synthetic resins. Natural resin refers to the amorphous organic substances obtained from animal and plant secretions in nature, such as rosin, amber, shellac, etc. Synthetic resin refers to the resin product obtained by chemical synthesis of simple organic matter or chemical reaction of some natural products, such as phenolic resin, polyvinyl chloride resin, etc., of which synthetic resin is the main component of plastic.

Press Synthesis Reaction

In this way, resins can be divided into adducts and condensation polymers. Adducts refer to polymers prepared by addition polymerization, and the chemical formula of its chain link structure is the same as the molecular formula of monomers, such as polyethylene, polystyrene, polytetrafluoroethylene, etc.

Polymer condensation refers to the polymer prepared by condensation polymerization, and the chemical formula of its building blocks is different from the molecular formula of monomers, such as phenolic resins, polyester resins, polyamide resins, etc.