What is bisphenol A epoxy resin
Epoxy resin is a kind of high molecular weight thermosetting resin containing at least two epoxy groups in the molecule. People produced it by a series of polycondensation reactions between a compound containing two phenolic hydroxyl groups (such as bisphenol A or other polyphenols or polyol) and epichlorohydrin. People often add the names of different monomers in front of epoxy resins. Bisphenol A epoxy resin is made from bisphenol A and epichlorohydrin. People call this process as Synthesis of bisphenol A epoxy resin.
Synthesis of bisphenol A epoxy resin
Synthesis of bisphenol A
Bisphenol A is an important raw material for preparing epoxy resin.
Phenol and acetone condense to form 2,2-(4,4′-dihydroxydiphenyl)propane, referred to as bisphenol A or diphenol propane.
Synthesis of epichlorohydrin and epoxy resin
First, 3-chloropropylene reacts with hypochlorous acid HOCL to generate 1,3-dichloropropanol. Secondly, it reacts with sodium hydroxide to produce epichlorohydrin by intramolecular nucleophilic substitution reaction. People controlled the degree of polymerization by adjusting the molar ratio of bisphenol A to epichlorohydrin to meet the needs of different uses.
Properties of bisphenol A epoxy resin
Linear epoxy resin can generate a three-dimensional network structure by adding a curing agent. Commonly used curing agents are amines or carboxylic anhydrides, such as triethylenetriamine, maleic anhydride, and phthalic anhydride. The function of the curing agent is to open the two active epoxy groups at the ends of the epoxy resin chain, so that the linear molecules can cross-link each other to form a three-dimensional structure. Because there are hydroxyl groups, ether bonds, and epoxy groups in the epoxy resin structure, it has a very high bonding force. Due to the chemical activity of epoxy groups, people can use a variety of compounds containing active hydrogen to open the ring, cure and cross-link to form a network structure, so it is a thermosetting resin.
Advantages and uses
Bisphenol A epoxy resin has extremely strong bonding properties. And it can firmly bond various materials, such as metals, ceramics, glass, wood, etc., commonly known as “universal glue”.
No bubbles are generated when epoxy resin is cured. And the shrinkage is small after curing, and the mechanical strength is high. It has good electrical insulation properties and is resistant to acid, alkali, and salt. Laminated products made with glass fiber as filler are stronger than the corresponding laminated materials of phenolic. Also they are stronger than the one of unsaturated polyester resins. And they are close to the strength of steel, so people called them “glass steel”.
Category: Exhibition
Related Links: CAS No 77 94 1, CAS No 77 89 4, Dimethyl Phthalate, Dibutyl Adipate, Home
