Polyester Resins

Polyester Resins

1. Saturated Polyester Resins

 

Polyester resins are part of the polymer family that contains ester functional groups in its structure. Industrially, they are involved in the creation of products such as Polyethylene Terephthalate (PET) and Polycarbonate (PC). According to their chemical structures, polyesters can be classified into two main types as saturated and unsaturated polyesters.

PET represents the structure of a typical saturated polyester resin. Saturated polyester resins are prepared by esterification of polybasic acids and polyols, and their characteristic structure provides excellent flexibility while maintaining high hardness. Saturated polyester resins are available in both liquid (solvent-based) and solid form. Application areas of solvent-based saturated polyester resins; automotive paints as well as sheet metal, can and coil coatings. They are also used as corrosion inhibitors in iron and steel structures coated with epoxy-based primers.

Properties of saturated polyester resins;

- Versatile application and weather resistance

- Excellent chemical resistance

- Significant hardness and toughness

- Stain resistance

- Excellent color stability

 

2. Poslex - Unsatured Polyester Resin Additive

 

Product Name POSLEX
Type -
APPEARANCE White Crystals
SOLID % MİN 99,6
melting poınt(℃) 256-259
GENARAL PURPOSE This product is an additive as a shelf-life extender for understed polyester resin.
There Commended amount is betweebn 0,005-0,01%  There commended amount is between 0,005-00

 

POSLEX is not equivalent to hydroquinone. Hydroquinone provides the protection of polyester against the oxygen in the air. The oxygen in the air is an initiator for polyesters. Hroquinone binds the oxygen by giving quinone. POSLEX is irrelevant with oxygen. POSLEX prevents the formation of new radical or the radicals which formed in waiting period by the oxygen in the air. Because of that reason and the less usage of POSLEX instead of hydroquinone.

POSLEX doesn't affect the forming time of "curing" during the polyester usage. However, hydroquinone and its derivatives are oxygen absorbents and they combine with peroxide giving quinone and they increase the quantity of peroxide needed for polymerization. In another way, hydroquinone prolongs the time of "curing". whereas POSLEX does not.

TESTING METHOD: POSLEX is dissolved in ethylene glycol or methanol for preparing 20% solution of it. 100g of unsaturated polyester resin is taken into a glass bottle with a lid. 0,5-5g of the prepared POSLEX solution is added into the resin and mixed well. Then, the mixture is put into oven at 125 °C. Gelling control is done at half an hour intervals. Every hour corresponds to a month.

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