Polybutylene Naphthalate (PBN) Resin
Introduction
Polybutylene naphthalate (PBN) resin is a unique engineering plastic that offers a well-balanced combination of advanced properties, including excellent slidability, chemical resistance, and barrier performance. Developed using Teijin’s proprietary technology, PBN resin leverages the characteristics of its naphthalene backbone to achieve a combination of properties that is difficult to obtain with conventional materials, providing greater design flexibility for applications ranging from mechanical components to advanced functional applications.
Features
PBN resin exhibits the following characteristics due to its naphthalene backbone derived from naphthalene dicarboxylic acid (NDC).
- Excellent Sliding Performance
Its excellent self-lubricating properties help reduce wear and degradation caused by sliding, while maintaining stable performance even under unlubricated conditions.
- Low Extractables
Minimal leaching of material constituents makes PBN resin suitable for applications requiring high levels of cleanliness, including precision equipment and high-purity environments.
- Excellent Chemical Resistance
PBN resin offers high resistance to a wide range of chemicals and solvents, ensuring long-term reliability even in demanding operating environments.
Grade Lists
General properties
| Property | Unit | Measurement method | Measurement condition | PBN | PBT |
|---|---|---|---|---|---|
| Specific gravity | g/cm3 | ASTM D792 | - | 1.31 | 1.31 |
| Molding shrinkage (1.5mm) |
% | In-house method | Machine direction | 1.16 | 1.67 |
| Transverse direction | 1.26 | 1.67 | |||
| Tensile strength (max.) | MPa | ASTM D638 | - | 65 | 52 |
| Tensile elongation (max.) | % | ASTM D638 | - | 87 | >200 |
| Flexural modulus | MPa | ASTM D790 | - | 1,920 | 2,550 |
| Impact strength (1/8 inches) |
J/m | ASTM D256 | Notched | 34 | 34 |
| Un-notched | NB | NB | |||
| Surface hardness | - | ASTM D785 | Rockwell | M102 | M75 |
| Melting point | ℃ | DSC method | - | 243 | 225 |
| Glass transition temperature | ℃ | DSC method | - | 78 | 22 |
| Deflection temperature under load | ℃ | ASTM D648 | Load : 1.82MPa | 77 | 58 |
- *Figures described in this table are representative values, not
the values for guaranteeing the performance under specific application.
Meanwhile, the contents are subject to revision without prior notice.
Engineering Service
Abrasion property
Sliding wear test
Chemical resistance
| Chemical type | PBN | PPS | PEEK | PES | PET | PBT |
|---|---|---|---|---|---|---|
| Ethylenediamine | A | A | A | D | D | D |
| Ethanol | A | A | A | A | A | A |
| Ethyl acetate | A | A | A | B | B | B |
| Toluene | A | A | A | A | A | B |
| Acetone | A | A | A | D | C | B |
| Xylene | A | A | A | A | A | A |
| Chemical type | PBN | PPS | PEEK | PES | PET | PBT |
|---|---|---|---|---|---|---|
| Ammonia water | A | A | A | A | D | A |
| Hydroxylation Na 10% | A | A | A | A | B | A |
| Hydroxylation Na 30% | A | A | A | A | B | B |
| Chemical type | PBN | PPS | PEEK | PES | PET | PBT |
|---|---|---|---|---|---|---|
| Formic acid | A | A | A | B | C | C |
| Acetic acid | A | A | A | A | B | B |
| Concentrated nitric acid | D | D | D | D | D | D |
| Concentrated hydrochloric acid | A | A | A | B | B | B |
| Chemical type | PBN | PPS | PEEK | PES | PET | PBT |
|---|---|---|---|---|---|---|
| Hydrogen peroxide 30% | A | A | A | A | A | A |
| Hypochlorous acid Na | A | A | A | A | A | A |
| Chloride Na saturated aqueous solution | A | A | A | A | A | A |
- A
- No change (Weight change by 1% or less, tension rupture strength retention by 95% or more, no appearance change)
- B
- Slight change (Weight change by between 1% to 10%, tension rupture strength retention by between 95% to 70%, appearance changed)
- C
- Extensive change (Weight change by 10% or more, tension rupture strength retention by 70% or less, appearance extensively changed)
- D
- Dissolved
Molding of PBN Resin
PBN resin can be processed using standard injection molding equipment and offers stable processability. With appropriate processing conditions, high-quality molded parts can be produced efficiently.
1.Molding Equipment
PBN resin can be processed using standard injection molding machines and conventional molds. It is also suitable for extrusion and machining, allowing a wide range of processing methods to be selected according to the application.
2.Molding Conditions
- (1)Predrying
The pellets must be thoroughly dried before molding. Adequate drying helps prevent surface defects and deterioration of physical properties during molding.
*Recommended drying conditions: 140°C for 3 to 5 hours using a dehumidifying dryer - (2)Key Molding Parameters
- ①PBN resin can be molded at a resin temperature of 270 to 300℃. For stable molding, a temperature range of 275 to 295°C is recommended.
- ②Injection pressure: Injection pressure can be set within a range of 600 to 1,200 kg/cm2. To minimize residual stress and flash, however, an injection pressure of 1,000 kg/cm2 or less is recommended whenever possible.
- ③Injection speed: A medium to high injection speed is recommended.
- ④Mold temperature: A mold temperature of 90 to 120℃ provides molded parts with good appearance and physical properties.
