The most commonly used epoxy resins are the diglycidyl ethers of bisphenol A (DGEBPA), obtained by reacting bisphenol A (BPA) with epichlorohydrin (ECH). Epoxy is the family of basic components or cured end products of epoxy resins. Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers that contain epoxy groups. The epoxy functional group is also collectively referred to as epoxy.
The IUPAC name for an epoxide group is oxirane. Epoxy resins are a class of thermosetting polymers made of monomers containing at least two epoxy groups. Provides strong adhesion, chemical resistance and other specialized properties. Because of these qualities, epoxy resins are used in a variety of industrial and consumer products.
Epoxy resins are thermosetting polymers with unique strength and mechanical properties. They are the result of a chemical reaction called “curing”, involving epoxides and other chemicals more commonly known as “hardeners” or curing agents. A number of substances can be used as hardeners, including polyamines, aminoamides, or phenolic compounds. Epoxy, also known as polyepoxide, is a polymer used to create protective coatings, fillers, and scratch resistant adhesive products for a variety of applications.
Epoxy resin is viscous when in liquid form, cures quickly and adheres to a wide range of substrate materials, such as wood, metal, glass, concrete and stone. In its most basic form, epoxy is composed of a liquid epoxy resin and a chemical hardener that cures the resin in hardened plastic. Once hardened, epoxy is extremely strong, dimensionally stable and resistant to chemicals. Epoxy is an organic compound formed by carbon chains attached to other elements such as hydrogen, oxygen or nitrogen.
This bond occurs through a covalent bond, in which the elements share a pair of electrons to stay together. Workers may be exposed to uncured epoxy resins if they are improperly protected or are not handling epoxies with the right tools. Electric generators, connected via transmission to the rotor blades, convert mechanical wind energy into usable electrical energy and rely on the electrical insulation of epoxies and high thermal resistance properties. Although casting and coating epoxies have similar characteristics, it is important to select the epoxy resin that best suits the material and application.
An important criterion for epoxy resins is the epoxy value, which is related to the content of the epoxy group. Paul Schlack from Germany first reported and patented the condensation of epoxides and amines in 1934.Epoxies are also used in decorative and high-performance floors, such as terrazzo floors, chips and colored aggregates, and can improve the aesthetic appeal of materials such as marble. In principle, any molecule containing a reactive hydrogen can react with the epoxy groups of the epoxy resin. The reaction of polyepoxides with themselves or with polyfunctional hardeners forms a thermosetting polymer, often with favorable mechanical properties and high thermal and chemical resistance.
Epoxies can be used to finish drawings, photos and images and protect art from ultraviolet light. Because aliphatic epoxies have a lower electron density than aromatics, cycloaliphatic epoxies react less easily with nucleophiles than epoxy resins based on bisphenol A (which have aromatic ether groups). Epoxy thermosets are reactions between an epoxy resin, a small molecule, or a prepolymer that is functionalized with epoxy end groups and a hardener or cross-linking agent. Epoxies contribute to a variety of products and technologies that help improve energy efficiency and reduce greenhouse gas emissions.
Evaluating Potential BPA Emissions from Epoxy Applications Safety Brochure Toxicology Brochure Epoxies in the Workplace. Many properties of epoxies can be modified (for example, silver-filled epoxies with good electrical conductivity are available, although epoxies are typically electrical insulators). . .
