Polyisobutylene succinimide (PIBSI) manufacturer - supplier

Product Description

Polyisobutylene succinimide, also name PIBSI, PIBSI is an ashless dispersant used in high-performance lubricants and fuel applications.

Polyisobutylene succinimide as the dispersants are important additives for inhibiting the deposition of impurities such as sludge and varnish, and are one of the five most commonly used lubricating oil additives, PIBSI is a mainstream type of dispersant.

As a critical component in engine oils, it effectively prevents the formation of sludge, varnish, and carbon deposits on internal engine surfaces, maintaining engine cleanliness and operational efficiency over extended drain intervals.

Technical Specifications (Typical Data)

Polyisobutylene succinimide synthesis

PIBSI is produced via a thermal process ensuring it is chlorine-free.

The synthesis of polyisobutylene succinimide involves a two-stage chemical reaction.

• First, high-reactive polyisobutylene (HR-PIB, enerally highly reactive, with a molecular weight of 500-3000) reacts with maleic anhydride through a thermal "ene" reaction to produce polyisobutylene succinic anhydride (PIBSA). Because this process is thermal rather than chemical-catalyzed by chlorine, the resulting intermediate is highly pure and no chlorine.
• The second, PIBSA is aminated with polyamines (such as TEPA or DETA, usually weakly basic, typically diethylenetriamine, triethylenetetramine, or tetraethylenepentamine, etc) to form the final succinimide structure.
• The final product is filtered and vacuum-stripped to ensure a clear, thick liquid with stable chemical properties.

Polyisobutylene succinimide structure

The chemical structure of PIBSI consists of a long-chain hydrocarbon "tail" and a polar "head" group.

The polyisobutylene chain provides excellent oil solubility, while the succinimide polar head group provides the necessary affinity for polar contaminants and metal surfaces. This dual-nature structure allows the additive to surround soot and oxidation products, keeping them suspended in the oil.

Polyisobutylene succinimide dispersant is generally a surfactant with a relatively large molecular weight. Its molecular structure consists of a hydrocarbon group (lipophilic end), a polar group, and a linker group.

Typles of Polyisobutylene Succinimide

Polyisobutylene mono succinimide:

• Mono-substituted structure, with high base value and nitrogen content.

Polyisobutylene bis succinimide

• Bis-substitution structure offers balanced performance and good dispersion properties.

Boronated polyisobutylene succinimide

• Boronated, it not only has a good dispersibility but also possesses antioxidant and anti-wear properties.

High molecular weight polyisobutylene succinimide

• With a molecular weight of 2300, higher molecular weight results in better stability.

Boride high molecular weight polyisobutylene succinimide

• It also possesses high molecular weight, boron content, and dispersibility.

Synonyms & CAS Number

• Common Name: polyisobutylene succinimide pibsi
• Polyisobutylene succinimide cas: 84605-20-9 or 68439-80-5 or 72269-41-1
• Polyisobutylene succinimide hs code: 3811210000

Pibsi dispersant features

PIBSI has good viscosity-temperature characteristics, effectively dispersing black sludge and soot. Therefore, engine oils containing this dispersant have longer oil change intervals and less sludge in the crankcase. It also improves the dispersion and solubilization of high-temperature oxidation products and lubricating oil oxidation products.

Particularly suitable for automotive/driveline system lubricants.

• Superior Dispersion: Effectively disperses low-temperature sludge and high-temperature deposits.
• Chlorine-Free: Produced via thermal process, ensuring environmentally friendly disposal and high purity.
• Thermal Stability: Maintains chemical integrity under high-temperature operating conditions.
• High Reactivity: Derived from high-reactive polyisobutylene for better performance yields.
• Multi-functional: Acts as both a lubricant dispersant and a fuel oil detergent.
• Ashless Nature: Does not contribute to metallic ash buildup in after-treatment systems.

Product Applications

PIBSI is a versatile additive used by lubricant blenders and fuel refineries worldwide:

• Engine Oils: Primary dispersant for passenger car motor oils (PCMO) and heavy-duty diesel engine oils (HDEO).
• Driveline Dispersants: Specifically used in transmission fluids and gear oils to prevent sludge buildup in complex gear systems.
• Fuel Additives: Functions as a high-quality detergent in gasoline and diesel fuels to keep fuel injectors and intake valves clean.
• Marine Lubricants: Used in marine cylinder oils to handle heavy fuel combustion by-products.

Compatibility & Blending

PIBSI shows excellent compatibility with a wide range of lubricant components, including:

• Detergents: Works synergistically with Calcium/Magnesium Sulfonates and Phenates to provide total engine protection.
• Anti-wear Agents: Fully compatible with ZDDP (Zinc Dialkyldithiophosphate).
• Antioxidants: Stable when blended with phenolic and aminic antioxidants.
• Base Oils: Easily soluble in Group I, II, III mineral oils and synthetic PAO.

Documentation & Quality Support

Chemost provides complete technical support for your procurement and compliance needs. We provide a full suite of documents for every batch, including:

• Technical Data Sheet (TDS)
• Polyisobutylene succinimide msds
• Certificate of Analysis (COA)
• manufacturing and supply a variety of dispersants with molecular weights of 950, 1000, 1300, 2300, and 2400, and nitrogen contents of 1-5% and base numbers of 15-50. Boron-modified dispersants are also available.

Frequently Asked Questions (FAQ)

Q: How is polyisobutylene made?

A: PIB is made from the monomer isobutylene by cationic vinyl polymerization

Q: What is the recommended storage temperature for PIBSI?
A: For long-term storage, the temperature should not exceed 45 °C. For short-term handling and blending, the temperature should remain below 75 °C to maintain product stability.

Q: Can PIBSI be used in both gasoline and diesel engines?
A: Yes, it is a highly effective ashless dispersant suitable for both internal combustion engine types, as well as being an excellent component for driveline dispersants.

Q: Is this product chlorine-free?
A: Yes, our Polyisobutylene succinimide is produced through a thermal process, which eliminates the use of chlorine during the synthesis of the PIBSA intermediate.

Q: What is the standard packaging for bulk orders?
A: We typically supply PIBSI in 170kg metal drums or 900kg IBC tanks, depending on your factory's requirements.

Q: What are PIBSI driveline dispersants?

A:PIBSI driveline dispersants are important lubricant additives, composed of polyisobutylene succinimide. Their function is to suppress impurities such as sludge and varnish, and to suspend these impurities in the oil in colloidal form.

Q: How to make PIBSA?

A:After HR-PIB and MA are thoroughly mixed for 6-8 hours at a high temperature and pressure above 200 degrees Celsius, impurities are filtered out.