Bakélite, chemically known as phenolic plastic, is recognized as the first type of plastic to be industrially produced. It is renowned for its high mechanical strength, excellent insulation properties, heat resistance, and corrosion resistance, making it ideal for manufacturing electrical materials such as switches, lamp heads, headphones, and telephone cases. The introduction of Bakelite has had a significant impact on industrial development.
Propriétés mécaniques
Phenolic plastic is characterized as a hard and brittle thermosetting material. Bakelite exhibits non-absorbent and non-conductive properties, along with high-temperature resistance and strength. Its malleability resembles that of wood, which is why it is often referred to as “Bakelite.” The production process involves mixing powdered phenolic resin with sawdust, asbestos, or clay, which is then pressed into molds at high temperatures to create finished products.
Bakelite features a hard surface that is brittle and fragile, producing a sound similar to wooden boards when struck. It is mostly opaque and comes in dark colors such as brown or black, and it does not soften in hot water. Its main component is phenolic resin, contributing to its insulating properties.
Molding Performance
Molding Properties: Bakelite has good molding properties, though it generally exhibits greater shrinkage and directionality compared to amino plastics. It may contain moisture volatiles, so preheating before molding is recommended. Additionally, the mold temperature and molding pressure should be increased if preheating is not performed.
Mold Temperature: The fluidity of Bakelite is significantly affected by mold temperature; typically, fluidity declines rapidly at temperatures above 160°C.
Hardening Speed: The hardening speed of Bakelite is generally slower than that of amino plastics, and the heat released during hardening is substantial. This can lead to high internal temperatures in large, thick-walled plastic parts, resulting in uneven hardening and potential overheating.
When the molar ratio of formaldehyde to phenol is less than 1, thermoplastic products can be obtained, known as thermoplastic phenolic resin or linear phenolic resin. This type does not undergo further condensation and can be cured by adding a curing agent, such as hexamethylenetetramine, at a curing temperature of 150°C, often mixed with fillers to create what is commonly known as Bakelite powder.
Conversely, when the molar ratio of formaldehyde to phenol exceeds 1, an alkali-catalyzed reaction produces stage A resin, which is a thermosetting phenolic resin soluble in organic solvents. This stage A resin contains hydroxymethyl groups that can undergo further condensation, eliminating the need for an external curing agent. Upon heating, this resin transforms into stage B resin, also known as semi-soluble phenolic resin, which is insoluble and non-melting but can swell and soften. Continued reaction leads to the formation of stage C resin, known as insoluble phenolic resin.
The curing of thermosetting phenolic resin can occur through two methods: room temperature curing and heat curing. Room temperature curing can utilize non-toxic agents like NL, although other options such as benzene sulfonyl chloride or petroleum sulfonic acid are available, albeit with higher toxicity and irritant properties.
Processus de commande
T1: Comment soumettre une demande de traitement?UN: Vous pouvez nous contacter via WhatsApp: +86 15323729231 ou par email [email protected].B: Nous prenons en charge les formats de fichiers STEP/STL/IGES. Vous pouvez également envoyer vos fichiers à notre service email. Notre système générera un devis et traitera des recommandations dans les délais 1 heure.
T2: Fournissez-vous des suggestions d'optimisation de la conception?UN: Oui! Notre équipe d'ingénieurs propose un DFM gratuit (Conception pour la fabricabilité) revoir, fournir des suggestions d'optimisation pour améliorer la structure et réduire les coûts.
Tarifs & Livraison
T3: Quelle est la quantité minimum de commande (MOQ)?UN: Pas de quantité minimale de commande! Nous acceptons les commandes à partir de 1 morceau, que ce soit pour l'impression 3D ou l'usinage CNC.
T4: Ce qui est inclus dans le devis?UN: Le devis couvre les frais de matériel, frais de traitement, et traitement de surface de base (Par exemple, sablage). Processus supplémentaires (Par exemple, galvanoplastie, anodisation) sera cité séparément.
Q5: Quel est le délai de livraison standard?
- Usinage CNC: 3-5 jours (jusqu'à 7 jours pour pièces complexes)
- 3D Impression: 72 heures
Technologie & Qualité
Q6: Quelle est la précision d'usinage?
- Usinage CNC: Prototypage rapide avec une tolérance de ±0,05 mm, 0.1tolérance de forme en mm, et rugosité de surface Ra1,6 ou mieux.
- 3D Impression:
- Pièces en résine: ±0,2 mm
- Pièces en nylon: ±0,3 mm
- Pièces en plastique: ±0,3 mm
- Pièces métalliques: ±0,3 mm
Q7: Quels matériaux soutenez-vous?✅Usinage CNC:
- Alliage d'aluminium: 6061, 7075
- Alliage de cuivre: Laiton (H59), Cuivre rouge (T2)
- Acier allié: 45# Acier
- Acier inoxydable: SUS304
- Plastiques:
- ABS (Blanc, Noir)
- POM (Blanc, Noir)
- Bakélite (Noir, Orange)
- Acrylique (Transparent)
- Panneau époxy FR4 (Vert)
- Nylon PA6 (Blanc)
- Polycarbonate (Transparent)
✅ Impression 3D:
- Résine, Nylon, Plastiques techniques, Acier inoxydable
Service après-vente
Q8: Que faire si les pièces ne répondent pas aux exigences?UN: Si des défauts surviennent en raison de nos problèmes de traitement, nous garantissons une remise à neuf gratuite.
