PETG 乙二醇改性-聚对苯二甲酸乙二醇酯

 

PETG 乙二醇改性-聚对苯二甲酸乙二醇酯 

　

典型应用范围:

医药设备（试管、试剂瓶等），玩具，显示器，光源外罩，防护面罩，冰箱保鲜盘等。

注塑模工艺条件:

干燥处理：加工前的干燥处理是必须的。湿度必须低于0.04%。建议干燥条件为65C、4小时，注意干燥温度不要超过66C。

熔化温度：220~290C。

模具温度：10~30C，建议为15C。

注射压力：300~1300bar。

注射速度：在不导致脆化的前提下可使用较高的注射速度。

化学和物理特性:

PETG是透明的、非晶体材料。玻璃化转化温度为88C。PETG的注塑工艺条件的允许范围比PET要广一些，并具有透明、高强度、高任性的综合特性。

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