There is a transparency second only to acrylic (PMMA), environmentally friendly and easy to mold plastic resin, do you know what it is?
They are new series of transparent engineering plastics, the perfect combination of high transparency, high impact resistance and high chemical resistance of them, can replace PC and other transparent materials in various fields, in recent years, demand is growing rapidly.
They are copolyester without Bisphenol A (also known as BPA), can be divided into PETG, PCTG and PCTA and Tritan (high temperature PCTG) four categories!
Today we want to introduce is the high demand of PETG, PCTG, let's study it together.
PETG
PETG, full name is ethylene terephthalateco-1,4-cyclohexylenedimethylene terephthalate, is a transparent, non-crystalline copolyester, commonly used copolymer monomer is 1,4-Cyclohexylenedimethylene (CHDM), its content is less than 50%.
As a transparent engineering plastic, PETG has excellent overall performance with good adhesion, transparency, color, chemical resistance and stress whitening resistance, and is easy to mold and process.
For example, PETG sheet has excellent thermoforming properties and is easy to produce products with complex shapes and large stretch ratios, short molding cycles, low temperatures and high yields.
Compared with PET, PETG has an extra copolymerization unit of 4-cyclohexanedimethanol, so the performance of PETG is very different and unique from PET and PCT,, Eastman (USA) and SK (Korea) have more mature technology.
PETG can be designed into any shape according to the designer's intention and is widely used in the market for sheet, high performance shrink film, bottles and dissimilar materials through conventional extrusion, injection molding, blow molding and blister molding, etc. It also has excellent secondary processing properties and can be modified by conventional mechanical processing.
PCTG
PCTG, full name is 1,4-Cyclohexylene Dimethylene Terephthalate Glycol, commonly used copolymer monomer is also CHDM, but the content is greater than 50%.
With the increase of CHDM in the copolymer, the melting point of PCTG decreases, the glass transition temperature rises, the crystallinity decreases, and an amorphous polymer is formed.
PCTG can be molded into pipes or various profiles, its products are hard, transparent, good gloss, not mooring, easy to mold and post-processing treatment, in line with environmental requirements, in line with food contact standards, widely used in building decoration and materials.
Both PETG and PCTG can replace transparent ABS, transparent PVC, K resin, MS, NAS and other transparent plastics, and in some properties can provide excellent performance that other transparent plastics.
The products are mainly used in the fields of architectural decoration, medical equipment, medical packaging, electronic blister packaging, food and cosmetic packaging, and cultural and office supplies.
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