درجات شاملة من بولي بوتيلين تيريفثالات (PBT) نقوم بقولبتها
نقوم بمعالجة راتنجات PBT عالية الأداء وخلائطها من قادة البتروكيماويات العالميين، مما يوفر عزلًا كهربائيًا مثاليًا وسلامة هيكلية:
| PBT Material Class |
العلامة التجارية والدرجة النموذجية |
الخصائص والمزايا الرئيسية |
| Unreinforced PBT |
• Sabic Valox 357
• BASF Ultradur B4500
• DuPont Crastin SO653 |
Excellent electrical properties, high flowability, and smooth surface aesthetics. Widely used for coil bobbins, decorative switches, and electrical components. |
| مقوى بملء الزجاج |
• سابك Valox 420 (ألياف زجاجية 30%)
• باسف Ultradur B4300G6 (ألياف زجاجية 30%)
• دوبونت Crastin SK605 (ألياف زجاجية 30%) |
Drastically elevated tensile strength, dimensional stability, and Heat Deflection Temperature (HDT up to 210°C). Ideal for automotive sensor housings, connector housings, and structural brackets. |
| مثبط اللهب (FR) |
• Sabic Valox 420SEO (30% GF FR)
• BASF Ultradur B4406 (Unreinforced FR)
• DuPont Crastin FR684 |
Meets UL 94 V-0 flammability standards with excellent dielectric strength and insulation resistance under high thermal stress. Specified for switches, circuit breakers, and relay housings. |
| Modified Alloys / Blends |
• Sabic Valox 855 (PBT/ASA)
• Lanxess Pocan TS3220 (PBT/PET) |
Engineered to minimize differential shrinkage and warpage while improving surface gloss and weatherability. Used in large automotive grilles and aesthetic outer trims. |
Applicable Molding Processes for PBT
PBT’s fast crystallization speed and low melt viscosity make it exceptionally suitable for complex structural molds:
| عملية القولبة |
ملاءمة العملية والتطبيق |
| حقن القوالب القياسي |
Excellent. Highly optimized for manufacturing high-insulation electrical sockets, switches, coil bobbins, and functional industrial covers. |
| قولبة الجدران الرقيقة |
High. PBT’s easy-flow characteristics support high-pressure injection to fill extremely thin-walled electronic connector grids without short shots. |
| قولبة الإدراج |
Excellent. Widely applied in the automotive electronic industry to encapsulate brass terminal pins and conductive strips directly inside PBT housings. |
Polybutylene Terephthalate (PBT) Injection Molding Guide
PBT is a polyester material that is highly sensitive to hydrolytic degradation at elevated processing temperatures. Strict manufacturing protocol execution is essential:
- التجفيف المسبق: PBT undergoes rapid hydrolysis if molded wet, causing polymer chain cleavage and severe brittle failure. Raw resin must be dried in desiccant dryers at 120°C (248°F) for 3–4 hours, keeping moisture content strictly below 0.02%.
- درجة حرارة الذوبان: Processed between 240°C and 275°C (464°F to 527°F). Temperatures exceeding 285°C can cause PBT to degrade thermal structures.
- درجة حرارة القالب: Managed between 40°C and 80°C (104°F to 176°F) for unreinforced grades, and up to 100°C for glass-filled grades to reduce fiber visibility on part surfaces.
- Warping and Shrinkage Control: Pure PBT exhibits high isotropic shrinkage (1.5% to 2.2%), whereas glass-filled PBT reduces shrinkage to 0.3%–0.8% but introduces anisotropic (differential) shrinkage along flow paths. Jucheng’s tooling engineers use advanced Moldflow analysis to optimize gate placement and minimize warping.
Key Application Industries for Molded PBT Parts
- مجموعات نقل الحركة وأجهزة الاستشعار في السيارات (IATF 16949): Ignition coil bobbins, sensor housings, distributor caps, headlight bezels, wiper arms, fuse boxes, and electric throttle bodies.
- Electrical & Electronic Hardware: Electrical connector shells, terminal blocks, circuit breaker parts, relays, and optical fiber buffer tubes.
- Consumer & Household Appliances: Hair dryer grilles, iron housings, microwave oven door handles, toaster bodies, and oven rotary switches.
- Industrial Machinery & Telecommunications: Chemical pump housings, impeller blades, industrial valve components, and telecommunication fiber enclosures.
