PBT注塑工艺
干燥处理：这种材料在高温下很容易水解，因此加工前的干燥处理是很重要的。建议在空气中的干燥条件为120℃，6~8小时，或者150℃，2~4小时。湿度必须小于0.03%。如果用吸湿干燥器干燥，建议条件为150℃，2.5小时。[2]
熔化温度：225~275℃，建议温度：250℃ 。
模具温度：对于未增强型的材料为40~60℃。要很好地设计模具的冷却腔道以减小塑件的弯曲。热量的散失一定要快而均匀。建议模具冷却腔道的直径为12mm。
注射压力：中等（到1500bar）。
注射速度：应使用尽可能快的注射速度（因为PBT的凝固很快）。
流道和浇口:建议使用圆形流道以增加压力的传递（经验公式：流道直径=塑件厚度+1.5mm）。可以使用各种型式的浇口。也可以使用热流道，但要注意防止材料的渗漏和降解。浇口直径应该在0.8~1.0*t之间，这里 t是塑件厚度。如果是潜入式浇口，建议最小直径为0.75mm。
SABIC Valox系列PBT介绍
Valox 175 Unreinforced, neat PBT resin for compounding only. Natural Color Only.
Valox 175HP Unreinforced, neat FDA compliant PBT resin for compounding only.
Valox 176 Unreinforced, neat PBT resin for fibers. Natural Color Only.
Valox 176HP Unreinforced, FDA compliant neat PBT resin for fibers. Natural Color Only.
Valox 195 For compounding only (not for injection molding) Unreinforced PBT.
Valox 195HP For compounding only (not for injection molding) Unreinforced PBT.
Valox 215HPR Unreinforced PBT with mold release. FDA food contact compliant in limited colors.
Valox 295 Unreinforced PBT;Melt viscositypoise.
Valox 305 PBT, For compounding only. Not intended for Injection Molding.
Valox 308 PBT, For compounding only. Not intended for Injection Molding.
Valox Unreinforced, general purpose. Typical viscositynbsp;
Valox 310SE0 Unreinforced, flame retardant PBT. V0-0.7mm.
Valox 311 Unreinforced, improved resistance to UV. Medium viscosity.
Valox 312 Unreinforced, For compounding only (not for injection molding).
Valox 315 Unreinforced, For extrusion/compounding only (not for injection molding).
Valox 325 General purpose, unreinforced, improved processing.
Valox 337 Low temperature impact PBT.
Valox 357 PC/PBT, Impact Modifier, Flame Retardant
Valox 357U Unreinforced PBTP, UL94 V-0/5VA rated. Improved UV resistant version of VALOX 357.
Valox 364 Designed for outdoor telecommunications enclosure applications.
Valox 365 Unreinforced, opaque, provides chemical resistance and dimensional stability.
Valox 3706 Impact modified PBT+PC. Outdoor enclosures. Not available in all colors.
Valox 4012G 10% glass fiber reinforced PBT with excellent mechanical properties.
ValoxGR, excellent strength, stiffness and dimensional stability. High heat resistance.
Valox 420HP 30% Glass filled PBT resin, FDA Food Contact compliant in limited colors.
Valox 420SE0 30% GR, UL94V-0/5V rated. Numerous applications.
Valox 420SE0U PBT, 30% Glass Reinforced, Flame Retardant UL94 V-0/5VA rated, UV-Stabilized
Valoxglass reinforced, impact modified.
Valox 451E 20% GR. Easy flow version of VALOX 451.
Valox 4521 PBT, Glass Fiber, Flame Retardant, UL Grad
