Chemical stability. Generally, the cured epoxy resin system has excellent alkali resistance, acid resistance and solvent resistance. Like other properties of cured epoxy systems, chemical stability also depends on the resin and curing agent selected. Appropriate selection of epoxy resin and curing agent can make it have special chemical stability. Dimensional stability. The combination of many of the above properties gives the epoxy resin system outstanding dimensional stability and durability. Resistant to mold. The cured epoxy resin system is resistant to most molds and Zirconia Ceramic Rods can be used in harsh tropical conditions.
Type classification According to the molecular structure, epoxy resins can be roughly divided into five categories:
1. Glycidyl ether epoxy resin
2. Glycidyl ester epoxy resin
3. Glycidylamine epoxy resin
4. Linear aliphatic epoxy resin
5. Alicyclic epoxy resin
The most widely used epoxy resin in the composite material industry is the first type of glycidyl ether epoxy resin mentioned above, among which diphenol-based propane epoxy resin (referred to as bisphenol A epoxy resin) is the main one. Followed by glycidylamine epoxy resin.
1. Glycidyl ether epoxy resin
Glycidyl ether epoxy resin is formed by polycondensation of phenols or alcohols containing active hydrogen and epichlorohydrin.
(1) Diphenol-based propane epoxy resin
Diphenol-based propane epoxy resin is formed by polycondensation of diphenol-based propane and epichlorohydrin.
The control indicators used as resin in industry are as follows:
①Epoxy value. Epoxy value is the most important indicator to identify the properties of epoxy resin. Industrial epoxy resin models are distinguished by Zirconia Ceramic Rods different epoxy values. The epoxy value refers to the amount of epoxy groups per 100 g of resin. The reciprocal of the epoxy value multiplied by 100 is called the epoxy equivalent. The meaning of epoxy equivalent is: the number of grams of epoxy resin containing 1 mol of epoxy groups.
②Inorganic chlorine content. The chloride ion in the resin can complex with the amine curing agent to affect the curing of the resin, and also affect the electrical properties of the cured resin. Therefore, the chlorine content is also an important indicator of the epoxy resin.
③Organic chlorine content. The content of Zirconia Ceramic Rods organochlorine in the resin indicates the content of the part of the chlorohydrin group that has not undergone ring-closure reaction in the molecule. Its content should be reduced as much as possible, otherwise it will also affect the curing of the resin and the performance of the cured product.
Is the chemical stability of advanced ceramics good?
2021 12/07