L-31 Pure Block Copolymer

• Product Name: L-31 Pure Block Copolymer

• Chemical Name: Polyoxyethylene-Polyoxypropylene Block Copolymer (Poloxamer 101)

• CAS No.: 9003-11-6 (100% Active Ingredient)

Technical Specifications

• Physical Form: Clear to slightly hazy, colorless liquid (100% Active, Solvent-Free)

• Average Molecular Weight: ~1100

• HLB Value: 5 (Highly lipophilic, oil-soluble)

• Cloud Point (1% Aqueous Dispersion): ~37°C

Product Description

L-31 is a premier, 100% active, solvent-free non-ionic block copolymer designed for high-performance industrial defoaming and lubrication systems. Characterized by a low molecular weight of ~1100 and a highly lipophilic HLB value of 5, L-31 exhibits exceptional solubility in mineral oils and synthetic hydrocarbon bases. With a distinctive inverse-solubility thermal behavior (Cloud Point of ~37°C), it acts as an elite, temperature-responsive defoamer and surface-active modifier in demanding industrial process fluids.

Key Applications & Technical Benefits

• High-Efficiency Industrial Defoaming: Functions as a superb, low-foaming and foam-suppressing agent in aqueous engineering systems. When the process temperature rises to or exceeds its cloud point (~37°C), the polymer becomes inversely insoluble, rapidly migrating to the air-water interface to collapse stubborn macro-foam.

• Metalworking Fluids & Lubricity Improver: Widely used as an oil-soluble lubricating additive in soluble cutting oils, drawing compounds, and stamping fluids. The robust polyether backbone enhances boundary film strength, reducing friction heat and tool wear under hydrodynamic shear.

• W/O Emulsion & Formulation Stability: Serves as an outstanding emulsifier and coupling agent specifically tailored for Water-in-Oil (W/O) emulsions and oil-rich synthetic systems. It effectively bridges incompatible organic phases, preventing oil phase separation during long-term storage.

• Excellent Rinseability & Cleansing Modifier: Due to its non-ionic nature and low molecular weight, it provides excellent wetting and deduction properties in specialized industrial laundry, metal cleaning, and tank rinsing concentrates, leaving no sticky residue.