2024年4月16日发(作者：邱夏柳)
PBT 聚對苯二甲酸丁二醇酯
典型應用範圍:
家用器具（食品加工刀片、真空吸塵器元件、電風扇、頭髮乾燥機殼體、咖啡器皿等），電器元件（開關、電機
殼、保險絲盒、電腦鍵盤按鍵等），汽車工業（散熱器格窗、車身嵌板、車輪蓋、門窗部件等）。
注塑模工藝條件:
乾燥處理：這種材料在高溫下很容易水解，因此加工前的乾燥處理是很重要的。建議在空氣中的乾燥條件爲
120C,6~8小時，或者150C，2~4小時。濕度必須小於0.03%。如果用吸濕乾燥器乾燥，建議條件爲150C，2.5
小時。
熔化溫度：225~275C，建議溫度：250C 。
模具溫度：對於未增強型的材料爲40~60C。要很好地設計模具的冷卻腔道以減小塑件的彎曲。熱量的散失一定
要快而均勻。建議模具冷卻腔道的直徑爲12mm。
注射壓力：中等（最大到1500bar）。
注射速度：應使用盡可能快的注射速度（因爲PBT的凝固很快）。
流道和澆口：建議使用圓形流道以增加壓力的傳遞（經驗公式：流道直徑=塑件厚度+1.5mm）。可以使用各種型
式的澆口。也可以使用熱流道，但要注意防止材料的滲漏和降解。澆口直徑應該在0.8~1.0*t之間，這裏 t是
塑件厚度。如果是潛入式澆口，建議最小直徑爲0.75mm。
化學和物理特性:
PBT是最堅韌的工程熱塑材料之一，它是半結晶材料，有非常好的化學穩定性、機械強度、電絕緣特性和熱穩定
性。這些材料在很廣的環境條件下都有很好的穩定性。 PBT吸濕特性很弱。
非增強型PBT的張力強度爲50MPa，玻璃添加劑型的PBT張力強度爲170MPa。玻璃添加劑過多將導致材料變脆。
PBT的；結晶很迅速，這將導致因冷卻不均勻而造成彎曲變形。對於有玻璃添加劑類型的材料，流程方向的收縮
率可以減小，但與流程垂直方向的收縮率基本上和普通材料沒有區別。一般材料收縮率在1.5%~2.8%之間。含30%
玻璃添加劑的材料收縮0.3%~1.6%之間。熔點（225%C）和高溫變形溫度都比PET材料要低。維卡軟化溫度大約
爲170C。玻璃化轉換溫度（glass trasitio temperature）在22C到43C之間。
由於PBT的結晶速度很高，因此它的粘性很低，塑件加工的周期時間一般也較低。
相關參考文件:
聚對苯二甲酸丁二醇酯(PBT) 的特性及應用
PBT
Generic Class
:
PBT ( Polybutylene Terephthalates )
Typical Applications
Household appliances (food processor blades, vacuum cleaner parts, fans, hair dryer housings, coffee makers,
etc.), electronics (switches, motor housings, fuse cases, key caps for computer keyboards, connectors, fiber
optic buffer tubing, etc.), automotive (grilles, body panels, wheel covers, and components for doors and
windows, etc.)
Injection Molding Processing Conditions
This material is sensitive to hydrolysis at high temperatures. It is therefore important to dry
the material prior to molding. Suggested drying conditions (in air) are 120 C (248 F) for 6 - 8
hours (or 150 C (300 F) for 2 - 4 hours). Moisture levels must be below 0.03%. When using
a desiccant dryer, drying at 120 C (248 F) for 2.5 hours is recommended.
220 - 280 C (428 - 536 F); aim: 250 C (482 F)
Drying
Melt
Temperature
Mold
Temperature
40 - 60 C (104 - 140 F) for unreinforced grades. For other grades, a wide range of
temperatures can be used, depending on the grade (15 - 80 C / 59 - 176 F). Cooling
channels should be properly designed to minimize part warpage. The heat removal must be
fast and uniform. Cooling channels of 12 mm diameter are recommended.
Moderate (up to maximum of 1500 bar / 21750 psi).
Resin Injection
Pressure
Injection Speed
Fastest possible speeds should be used (due to fast solidification of PBTs)
Runners and Gates
Full round runners are recommended to impart maximum pressure transmission (rule of thumb: runner
diameter = part thickness + 1.5 mm). A wide variety of gates may be used. Hot runners may also be used,
taking care to avoid drool and material degradation. Gate diameters or depths should preferably be between
0.8 - 1.0 times the part thickness. When using submarine gates, the minimum recommended diameter is 0.75
mm.
Chemical and Physical Properties
PBT is one of the toughest engineering thermoplastics. It is a semicrystalline resin and has excellent chemical
resistance, mechanical strength, electrical properties (high dielectric strength and insulation resistance), and
heat resistance, all of which are stable over a broad range of environmental conditions. It has very low
moisture absorption.
PBT, which is a polyester, is produced by the polycondensation reaction of dimethyl terephthalate an
butanediol.
2024年4月16日发(作者：邱夏柳)
PBT 聚對苯二甲酸丁二醇酯
典型應用範圍:
家用器具（食品加工刀片、真空吸塵器元件、電風扇、頭髮乾燥機殼體、咖啡器皿等），電器元件（開關、電機
殼、保險絲盒、電腦鍵盤按鍵等），汽車工業（散熱器格窗、車身嵌板、車輪蓋、門窗部件等）。
注塑模工藝條件:
乾燥處理：這種材料在高溫下很容易水解，因此加工前的乾燥處理是很重要的。建議在空氣中的乾燥條件爲
120C,6~8小時，或者150C，2~4小時。濕度必須小於0.03%。如果用吸濕乾燥器乾燥，建議條件爲150C，2.5
小時。
熔化溫度：225~275C，建議溫度：250C 。
模具溫度：對於未增強型的材料爲40~60C。要很好地設計模具的冷卻腔道以減小塑件的彎曲。熱量的散失一定
要快而均勻。建議模具冷卻腔道的直徑爲12mm。
注射壓力：中等（最大到1500bar）。
注射速度：應使用盡可能快的注射速度（因爲PBT的凝固很快）。
流道和澆口：建議使用圓形流道以增加壓力的傳遞（經驗公式：流道直徑=塑件厚度+1.5mm）。可以使用各種型
式的澆口。也可以使用熱流道，但要注意防止材料的滲漏和降解。澆口直徑應該在0.8~1.0*t之間，這裏 t是
塑件厚度。如果是潛入式澆口，建議最小直徑爲0.75mm。
化學和物理特性:
PBT是最堅韌的工程熱塑材料之一，它是半結晶材料，有非常好的化學穩定性、機械強度、電絕緣特性和熱穩定
性。這些材料在很廣的環境條件下都有很好的穩定性。 PBT吸濕特性很弱。
非增強型PBT的張力強度爲50MPa，玻璃添加劑型的PBT張力強度爲170MPa。玻璃添加劑過多將導致材料變脆。
PBT的；結晶很迅速，這將導致因冷卻不均勻而造成彎曲變形。對於有玻璃添加劑類型的材料，流程方向的收縮
率可以減小，但與流程垂直方向的收縮率基本上和普通材料沒有區別。一般材料收縮率在1.5%~2.8%之間。含30%
玻璃添加劑的材料收縮0.3%~1.6%之間。熔點（225%C）和高溫變形溫度都比PET材料要低。維卡軟化溫度大約
爲170C。玻璃化轉換溫度（glass trasitio temperature）在22C到43C之間。
由於PBT的結晶速度很高，因此它的粘性很低，塑件加工的周期時間一般也較低。
相關參考文件:
聚對苯二甲酸丁二醇酯(PBT) 的特性及應用
PBT
Generic Class
:
PBT ( Polybutylene Terephthalates )
Typical Applications
Household appliances (food processor blades, vacuum cleaner parts, fans, hair dryer housings, coffee makers,
etc.), electronics (switches, motor housings, fuse cases, key caps for computer keyboards, connectors, fiber
optic buffer tubing, etc.), automotive (grilles, body panels, wheel covers, and components for doors and
windows, etc.)
Injection Molding Processing Conditions
This material is sensitive to hydrolysis at high temperatures. It is therefore important to dry
the material prior to molding. Suggested drying conditions (in air) are 120 C (248 F) for 6 - 8
hours (or 150 C (300 F) for 2 - 4 hours). Moisture levels must be below 0.03%. When using
a desiccant dryer, drying at 120 C (248 F) for 2.5 hours is recommended.
220 - 280 C (428 - 536 F); aim: 250 C (482 F)
Drying
Melt
Temperature
Mold
Temperature
40 - 60 C (104 - 140 F) for unreinforced grades. For other grades, a wide range of
temperatures can be used, depending on the grade (15 - 80 C / 59 - 176 F). Cooling
channels should be properly designed to minimize part warpage. The heat removal must be
fast and uniform. Cooling channels of 12 mm diameter are recommended.
Moderate (up to maximum of 1500 bar / 21750 psi).
Resin Injection
Pressure
Injection Speed
Fastest possible speeds should be used (due to fast solidification of PBTs)
Runners and Gates
Full round runners are recommended to impart maximum pressure transmission (rule of thumb: runner
diameter = part thickness + 1.5 mm). A wide variety of gates may be used. Hot runners may also be used,
taking care to avoid drool and material degradation. Gate diameters or depths should preferably be between
0.8 - 1.0 times the part thickness. When using submarine gates, the minimum recommended diameter is 0.75
mm.
Chemical and Physical Properties
PBT is one of the toughest engineering thermoplastics. It is a semicrystalline resin and has excellent chemical
resistance, mechanical strength, electrical properties (high dielectric strength and insulation resistance), and
heat resistance, all of which are stable over a broad range of environmental conditions. It has very low
moisture absorption.
PBT, which is a polyester, is produced by the polycondensation reaction of dimethyl terephthalate an
butanediol.