CAS 69102-90-5 HTPB Hydroxyl-terminated polybutadiene HTPB for propellant, adhesives, sealants, coatings

HTPB is a liquid remote claw polymer, the new liquid rubber. The properties vary because HTPB is a mixture rather than a pure compound, and it is manufactured to meet customers' specific requirements. A typical HTPB is R-45M with each end of the chain terminated with a hydroxyl [OH] group. ( PS: we can do any versions of HTPB as customers request, and new design the HTPB with a single chain of hydroxyl -OH, Meanwhile, we can do hydrogenation of the HTPB)

It and chain extension agent, crosslinking agent in room temperature or high temperature reaction can generate 3D network structure of curing content.The curing content has excellent mechanical properties, especially good resistance to hydrolysis, acid and alkali resistant, wear resistance, low temperature resistance and excellent electrical insulation.

Polyurethanes prepared from HTPB can be engineered for specific physical properties; polyurethanes may be highly elastic or tough and rigid. Some products include: rigid foam insulation panels; durable elastomeric wheels and tires (used for roller coasters, escalators, skateboards, etc.); automotive suspension bushings; electrical potting compounds; high-performance adhesives; surface coatings and surface sealants; synthetic fibers (e.g., Spandex); carpet underlay; hard-plastic parts (e.g., for electronic instruments).

An important application of HTPB is in solid rocket propellant. It binds the oxidizing agent, fuel and other ingredients into a solid but elastic mass in most composite propellant systems. The cured polyurethane acts as a fuel in such mixtures. For example the propellant as "HTPB/AP/Al=12/68/20", which means, proportioned by mass, HTPB plus curative 12% (binder and fuel), ammonium perchlorate 68% (oxidizer), and aluminum powder 20% (fuel).

Similar propellants, often referred to as APCP (ammonium perchlorate composite propellant) are used in larger model rockets. A typical APCP produces 2–3 times the specific impulse of the black powder propellant used in most smaller rocket motors.

HTPB is also used as a hybrid rocket fuel.

The performance properties of HTPB as follow:

1. Hydrophobicity

2. Reactive hyroxyl groups

3. Low glass transition temperature

4. Low color - high clarity viscous liquid

5. Resistance to hydrolysis

6. Low temperature resistance

7. Low moisture permeability

8. Resistance to aqueous acids and bases

9. Strong wear resistance

10. Excellent adhesion to a variety of substrates

11. Electrical insulative properties