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PETG 乙二醇改性-聚對苯二甲酸乙二醇酯

 

PETG 乙二醇改性-聚對苯二甲酸乙二醇酯 

　

典型應用范圍:

醫藥設備（試管、試劑瓶等），玩具，顯示器，光源外罩，防護面罩，冰箱保鮮盤等。

注塑模工藝條件:

干燥處理：加工前的干燥處理是必須的。濕度必須低于0.04%。建議干燥條件為65C、4小時，注意干燥溫度不要超過66C。

熔化溫度：220~290C。

模具溫度：10~30C，建議為15C。

注射壓力：300~1300bar。

注射速度：在不導致脆化的前提下可使用較高的注射速度。

化學和物理特性:

PETG是透明的、非晶體材料。玻璃化轉化溫度為88C。PETG的注塑工藝條件的允許范圍比PET要廣一些，并具有透明、高強度、高任性的綜合特性。

PETG

Generic Class

PETG (Glycol-modified PET; Copolyesters)

Typical Applications

PETGs offer a desirable combination of properties such as clarity, toughness, and stiffness. Applications include medical devices (test tubes and bottles), toys, displays and lighting fixtures, face shields, and refrigerator crisper pans.

Injection molding processing conditions

　

Drying

Drying is essential for PETG prior to injection molding. The moisture level must be below 0.04%. Drying temperature is not to exceed 66 C (150 F). Drying at approximately 65 C (149 F) for 4 hours is recommended. 

Melt Temperature 

220 - 290 C (428 - 554 F); The melt temperature is grade specific 

Mold Temperature

10 - 30 C (50 - 86 F); Recommended: 15 C (60 F) 

Resin Injection Pressure

300 - 1,300 bar (4,350 - 19,000 psi) 

Injection speed

High speeds without causing embrittlement 

Chemical and Physical Properties

PETGs (or copolyesters) are glycol modified PETs; the modification is done by adding a second glycol during polymerization. The resulting molecular structure is irregular and the resin is clear and amorphous with a glass transition temperature of 88 C (190 F). PETGs can be processed over a wider processing range than conventional PETs and offer good combination of properties such as toughness, clarity, and stiffness.

Major Manufacturers

Eastman Chemicals