What is novolac used for?
What Does Novolacs Mean? These are resins produced by the complete poly-condensation of phenol and aldehydes for industrial uses as a replacement of natural resin such as shellac. They are available in solid and liquid form and is used in binders, articles, paints, molded pieces, laminated plastics and adhesives.
What is a novolac epoxy?
Five Star® Epoxy Novolac Coating is a two-component, 100% solids, highly chemical resistant epoxy coating for horizontal and vertical applications effective on both steel and concrete. It has excellent adhesion, a rapid drying time and will bond to concrete. Contains no volatile organic compounds (VOCs).
What is the use of phenolic resin?
Phenolic resins are good for high-temperature applications where parts must meet fire safety standards. Phenolic resins are used in a wide range of applications, including electronics, ballistics, mine ventilation, offshore water pipe systems, aerospace, rail and mass transit.
Where epoxy resins are used?
Epoxy resins are used as food-contact surface coatings for cans, metal jar lids, coatings and finishes, automobile parts, adhesives, aerospace applications, and as a coating for polyvinyl chloride (PVC) water pipe walls.
What is the meaning of Novolac?
Novolaks (sometimes: novolacs) are low molecular weight polymers derived from phenols and formaldehyde. They are related to Bakelite, which is more highly crosslinked. Novolaks are especially important in microelectronics where they are used as photoresist materials. They are also used as tackifiers in rubber.
Is Phbv a polyester?
Poly(hydroxybutyrate-co-valerate) (PHBV) is a completely biodegradable thermoplastic polyester produced by microbial fermentation. The current market price of PHBV is significantly higher than that of commodity plastics such as polyethylene and polystyrene.
What is difference between Novolac and Bakelite?
A linear product of Phenol formaldehyde polymer is Novolac used in paints. Novolac on heating with formaldehyde undergoes cross linking to form an infusible solid mass called bakelite. It is used for making combs phonograph records electrical switches and handles of various utensils.
What is the structure of Novolac?
Novolacs are phenol–formaldehyde resins with a formaldehyde-to- phenol molar ratio of less than one and are prepolymers for cured phenolic resins. Polymerization is completed using acid catalysts such as oxalic, hydrochloric or sulfonic acids. Novolacs dissolve in organic solvents.
What is the difference between epoxy resin and phenolic resin?
Phenolic resins and epoxy resins are two types of materials that we can use in this purpose. The key difference between phenolic resin and epoxy resin is that phenolic resins show a low level of heat resistance, whereas epoxy resins show a high level of heat resistance.
What is the structure of novolac?
What is epoxy used for in crafts?
Epoxy resin is a liquid form adhesive that dries clear with a shiny look. It is used in manufacture of plastics and paints. Resin works as a primer and coating on flooring and countertops as well. And it is popular in diy projects and art as a sealer.
What are some advantages to epoxy resins?
The primary advantages of epoxy resins are: a wide range of material characteristics, high mechanical properties, easy processing, low shrinkage during cure, and good adhesion to all types of fibers. Epoxies have high corrosion resistance and are less affected by water and heat than other polymeric matrices.
What does epoxy do you use?
It has been used in the construction and airline industries for years. One of the most popular uses for epoxy resin these days is in woodworking . Epoxy resin is an outstanding bonding agent and will bond with any wood type. It also bonds well with glass and aluminum.
What makes epoxy resins good adhesives?
The excellent adhesive properties of epoxy resins are due to the attractive forces between the epoxy resin and the surface of the substrate. These forces are usually polar forces or direct bonds that can form between reactive sites in the resin and reactive or polar sites on the surface of the substrate.
What is epoxy used for?
Epoxy is best known as a type of durable glue that provides a high level of bonding properties that are far superior to most ordinary paste style glues. Generally sold in a two component package that requires mixing just before use, epoxy is used to securely bind a number of different types of metals, plastics, and woods.
What is an Epoxy Phenol Novolac (EPN)?
Definition – What does Epoxy Phenol Novolac (EPN) mean? An epoxy phenol novolac (EPN) is an epoxy resin where the epoxide functional group is attached to the phenolic oxygen of a phenolic novolac. As such, each phenol oxygen of the novolac resin is attached with a -CH 2 – (C 2 H 3 O) group, where – (C 2 H 3 O) is a three-membered epoxide ring.