benefits of polyisobutylene (PIB)
Polyisobutylene (PIB) is a unique saturated linear polymer with the following key advantages:
- Gas barrier properties: Due to two symmetrical methyl side chains on the molecular chain, which slow chain motion and reduce free volume, it exhibits an extremely low gas diffusion coefficient and permeability, making it an ideal sealing material.
- Chemical stability: It demonstrates excellent corrosion resistance against acids, alkalis, water, salt solutions, and various polar solvents, withstanding attack from chemicals such as ammonia water, hydrochloric acid, phosphoric acid, and sodium hydroxide.
- Aging Resistance and Stability:The absence of double bonds in its molecular chain makes it resistant to degradation by oxygen, ozone, or ultraviolet light. Polyisobutylene (PIB) maintains excellent performance even after prolonged exposure to outdoor environments or high temperatures.
- Adhesion and Tackiness Enhancement: Particularly within the low-to-medium molecular weight range, it exhibits strong initial tack and sustained adhesion. It serves as an effective tackifier and plasticizer for adhesives, enhancing bonding performance in rubber, thermoplastic elastomers, and similar materials.
- Biocompatibility: Purified medical-grade polyisobutylene exhibits low skin irritation and excellent biocompatibility, making it suitable for medical applications such as transdermal patches and surgical suture tapes.
- Solubility and Compatibility: Polyisobutylene (PIB) dissolves in aliphatic hydrocarbons, aromatic hydrocarbons, and mineral oils. It exhibits excellent compatibility with various polymers (e.g., butyl rubber, SBS, asphalt) and is widely used in lubricants, cosmetics, sealants, and other fields.
- Colorless and Transparent Properties: High-purity polyisobutylene appears as a water-white transparent liquid or solid, making it suitable for products with stringent color requirements, such as colorless adhesives and cosmetic bases.
Properties of Polyisobutylene (CAS 9003-27-4)
| Property | Description |
|---|---|
| Chemical Name | Polyisobutylene |
| CAS Number | 9003-27-4 |
| Molecular Structure | Saturated hydrocarbon polymer |
| Appearance | Colorless to pale viscous liquid / semi-solid |
| Odor | Odorless |
| Solubility in Water | Insoluble |
| Solubility in Oils | Soluble |
| Density (20°C) | ~0.90–0.93 g/cm³ |
| Glass Transition Temperature (Tg) | Approx. −70 °C |
| Volatility | Very low |
| Chemical Stability | Excellent |
| Film-Forming Ability | High |
| Gas Permeability | Very low |
What is PIB material (CAS 9003-27-4) used for?
- Petroleum Additives: Polyisobutylene (PIB) serves as a lubricant additive to enhance lubricant performance.
- Adhesives: PIB exhibits excellent adhesion and elasticity, making it suitable for manufacturing pressure-sensitive adhesives, sealants, and similar products.
- Wires and Cables: Polyisobutylene can be used to manufacture insulation layers for wires and cables, enhancing electrical insulation properties.
- Plasticizer: Polyisobutylene (PIB) can serve as a plasticizer for plastics, improving processing properties and flexibility.
- Other Applications: Polyisobutylene (PIB) is also used in the production of rubber products, coatings, inks, and other fields.