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Polyester Resins

  Polyester resins are dark viscous and hard-flowing, almost colorless liquids. It is a two-component resin and it needs to add organic peroxides known as MEKP, which have a catalyst effect to cure. (1-2%) The curing time depends on the ambient temperature, and the hardener also called the catalyst's share in the mixture. When it is necessary to slow down the reaction, additives called inhibitors are used. In order for the resin to cure at normal room temperature, a 3rd material is needed. This material called accelerator is sometimes pre-mixed into the resin and the resin is put on the market in this way. It takes attention to mix the accelerator into the polyester, the chemical reaction that occurs during the mixture can produce an explosion. The main ingredient of polyester resins is Styrol, which is slightly toxic and evaporates during the reaction. The smell we know from polyester workshops or new boats is the smell of the flying Styrol. Polyester resins are sensitive to cold and moisture. In order to produce quality boats, temperature and humidity should be kept under control in the workshop during the construction process and hardening of the boat.

   The word polyester is a compound word that consists of "POLY" which means "very" and "ESTER", which is a chemical term that expresses an organic salt. We can describe.

The first practical application example of unsaturated polyester resins is in World War II. However, reinforcement with glass fiber was discovered as a very strong and light material in 1950. Today, unsaturated polyester resins have superior properties compared to their original form.

Both in Turkey and also the most widely used in the world FRP production of unsaturated polyester resins (which represent about 75% of the resin used roughly.) Is located in the thermosetting resin in the group reinforced plastics. It addresses all types of molding techniques, from simple molding techniques such as hand lay-up to the most sophisticated machined molding techniques. Polyester resins cover a very large chemical family and are generally obtained by condensation reaction of dibasic acids and polyhydric alcohols.

Dibasic Acid + Polyhydric Alcohol Polyester Resin + H2O

Depending on the type of dibasic acid used, unsaturated polyester resins are called "orthophthalic" or "isophthalic" to ensure that the composite is of general purpose or chemical resistance.