Unsaturated polyesters are
linear copolymers containing carbon-carbon double bonds
that are capable of undergoing further polymerization in the presence of free-radical initiators.
What is unsaturated polyester used for?
Unsaturated polyester resins are mainly used in the
production of fiber reinforced plastics and filled plastic products
, including sanitary-ware, tanks, pipes, gratings, and high performance components for the marine and transportation industry such as closure and body panels, fenders, boat hulls/ decks and other large …
What is unsaturated polyester?
Unsaturated polyester,
any of a group of thermosetting resins produced by dissolving a low-molecular-weight unsaturated polyester in a vinyl monomer and then copolymerizing the two
to form a hard, durable plastic material. … Bowling balls are made from unsaturated polyesters cast into molds with no reinforcement.
What is the difference between saturated and unsaturated polyester resin?
The key difference between saturated and unsaturated polyester resin is that the
saturated polyester resins have no double bonds in their main chain
whereas the unsaturated polyester resins have double bonds in their main chain.
How do you make unsaturated polyester resin?
General purpose unsaturated polyester resins were prepared by using
maleic anhydride, phthalic anhydride and propylene glycol with
the molar ratio of phthalic anhydride : maleic anhydride ranging from 1:2 to 2:1[32-33].
Which is better epoxy or polyester resin?
Epoxy is more resistant to wearing, cracking and peeling, and corrosion or damage from chemical or environmental degradation. Polyester is more fragile and useful for temporary fixes, or low-stress use. Epoxy is
generally more expensive than resin
, due to its strength and formulation requirements.
Is polyester A Fibre?
2.1 Polyester. Polyester fiber, specifically polyethylene terephthalate (PET), is the
most important synthetic fiber worldwide
in terms of production volume and applications. Polyester technology is responsible for a large number of products that range from cotton-blended staple to high-performance tire cord.
What are the two types of resin?
- Polyester Resins. Polyester resins are formed from the reaction of dibasic organic acids and polyhydric alcohols. …
- Phenolic Resins. Phenolic resins are a type of thermosetting resin. …
- Alkyd Resins. …
- Polycarbonate Resins. …
- Polyamide Resins. …
- Polyurethane Resins. …
- Silicone Resins. …
- Epoxy Resins.
What is a saturated polymer?
Polymers that contain hydrogen and carbon atoms are called hydrocarbons. Carbon atoms can form single bonds to four other atoms.
If the carbon atoms in a polymer are bound to four other atoms
the polymer is referred to as a saturated hydrocarbon.
How is unsaturated polyester made?
Unsaturated polyester, any of a group of thermosetting resins produced
by dissolving a low-molecular-weight unsaturated polyester in a vinyl monomer and then copolymerizing the two to form
a hard, durable plastic material.
What is saturated polyester resin?
Saturated polyester resin is
formed by the reaction of polybasic acids and polyols
, and its feature includes excellent flexibility and hardness. It is mainly used in can coating, rolled steel, non-stick pan, ink, adhesive, PET coil, metallic baking paint such as automotive paint, and so on.
What are the advantages of polyester resin?
Polyester resin offers the following advantages:
Adequate resistance to water and variety of chemicals
. Adequate resistance to weathering and ageing. Low cost.
Is epoxy a resin?
Epoxy is merely cured epoxy resin
. … For any epoxy, there are two primary parts to the equation: the resin and the curing agent. When the resin and the curing agent react together, the hardening process ensues.
Why accelerator is used as a compounding ingredient in polyester resin?
The polymerization reaction occurs between the unsaturated polyester resin and styrene in the resin anchorage. … Therefore, the addition of accelerator DMT
increases both the curing rate and the degree of polymerization of resin anchorage agent
.
What is the difference between polyester and epoxy resin?
Polyester resins have a strong chemical bonding with other polyester parts and most thermoset plastics. … Epoxy resin
forms stronger bonds
when it comes to gluing two pieces together and has better adhesive properties with surfaces like wood, metal or concrete.
What products are made from polyester resin?
The Water Clear Casting Polyester Resin is perfect for making decorative objects such as
Costume Jewellery
, Paperweights, Encapsulations (of Flowers, Coins or Biological Specimens). It can also be used for creating stylish table tops.
