PIB compound is a modified formulation based on polyisobutylene (PIB), combined with selected additives to improve performance for different industrial uses such as adhesives, automotive materials, lubricants, and construction products.
What Is the Composition of PIB Compound?
PIB compound is not pure polyisobutylene, but a blended material designed for specific performance requirements.
Base Polymer (PIB)
- Main component: 60–90%
- Common grades: low to medium molecular weight PIB such as PIB 2400 (MW 1000–5000)
- Function: provides viscosity, flexibility, and tackiness
Functional Additives
Content: 10–40%
Includes:
- Plasticizers (5–15%)
- Tackifiers (3–8%)
- Antioxidants (0.5–2%)
- Fillers (2–10%)
These additives help adjust performance for different PIB compound applications such as adhesive PIB, lubricant PIB additive, and sealing materials.
Key Properties and Applications of PIB Compound
PIB compound combines the core advantages of polyisobutylene (PIB) with improved formulation performance.
Strong Tackiness
Modified PIB compound shows higher adhesion than pure PIB, making it suitable for:
- PIB adhesive compound
- sealant and hot melt adhesive formulations
Improved Aging Resistance
- Outdoor service life: 12–18 years
- Better resistance to oxidation and weathering
- Common in PIB polymer compound for construction sealing
Low-Temperature Flexibility
- Glass transition temperature ≤ -65°C
- Stable performance in cold environments
- Used in PIB-based rubber modification and flexible materials
Main Application Areas of PIB Compound
- Adhesives & Sealants: PIB tackifier compound, pressure-sensitive adhesives
- Lubricants: PIB 2400 lubricant additive, viscosity modifier
- Automotive industry: rubber modification, sealing materials
- Construction materials: waterproof coatings, joint sealants
|
PIB Compound Grade |
Key Composition (PIB + Additives) |
Key Properties |
Main Applications |
|---|---|---|---|
|
Adhesive-Grade |
75–85% PIB 2400 + 8–12% tackifiers + 1–2% antioxidants |
Initial adhesion: 1.8–2.5 N/cm²; aging resistance ≥15 years |
Pressure-sensitive adhesives, butyl tapes, surgical tapes |
|
Automotive-Grade |
80–90% PIB (MW 5000–10000) + 5–8% plasticizers + 3–5% fillers |
Airtightness: Gas permeability ≤0.05 cm³/(m²·24h·atm); cold resistance ≤-65℃ |
Tire inner liners, automotive sealants, corrosion-resistant coatings |
|
Construction-Grade |
60–70% PIB + 10–15% plasticizers + 8–12% fillers |
Water resistance: Water absorption ≤0.5%/24h; tensile strength ≥1.2 MPa |
Waterproof roofing membranes, dampproofing, insulating glass sealants |