Features Of Solvay Sipomer SEM-25 Thickener
Shear-Stable Thickening - Maintains viscosity across processing conditions
Enhanced Adhesion - Improves substrate bonding by 25%
Water Resistance - Reduces moisture absorption by 35%
Alkali Tolerance - Stable performance in pH 7-10 systems
Process Flexibility - Compatible with cold/hot processing
Typical Applications Of Solvay Sipomer SEM-25 Thickener
High-Speed Printing - Viscosity stabilizer for flexographic inks
Structural Adhesives - Reinforcing agent for automotive applications
Textured Coatings - Anti-sag additive for decorative finishes
Industrial Primers - Rheology modifier for metal substrates
Specifications Of Solvay Sipomer SEM-25 Thickener
ppearance | - | Usually powder or granulated form (varies by specific type, e.g., some are cream - colored granules) |
Particle Size | µm | Specific values depend on the product type, for example, some have a particle size where ≤75 µm is ≤5% and ≤1180 µm is >95% |
pH (1% Aqueous Solution) | - | Generally in the range of 6.0 - 8.0 |
Brookfield Viscosity | cp | For a 1% solution in 1% KCl, measured with Brookfield LV at 60 rpm using spindle n° 3, it may be in the range of 1200 - 1600 cp |
Solubility | - | Soluble in water or specific solvents relevant to its application, forming a viscous colloidal solution |
Shelf Life | month | Approximately 24 months under proper storage conditions |
Solvay Sipomer SEM-25 Thickener – Frequently Asked Questions (FAQ)
Q1: What is the primary function of Sipomer SEM-25 in aqueous formulations?
A: Sipomer SEM-25 is a hydrophobically modified alkali-swellable emulsion (HASE) thickener designed to provide efficient rheology control and viscosity build in water-based systems, particularly under neutral to alkaline conditions. It enhances suspension stability, improves sag resistance, and delivers pseudoplastic flow behavior.
Q2: How is Sipomer SEM-25 typically incorporated into a formulation?
A: It is generally added during the post-addition stage, after pH adjustment to ≥7.5, and requires adequate mixing to ensure uniform dispersion. Pre-dilution with water or compatible co-solvents may be used to facilitate incorporation, especially in low-shear processes.
Q3: Is Sipomer SEM-25 compatible with common surfactants and co-thickeners?
A: Yes — it demonstrates good compatibility with nonionic and anionic surfactants commonly used in architectural coatings, cleaners, and personal care products. Synergistic effects may be observed when combined with associative thickeners or cellulose derivatives, though compatibility testing is recommended for each specific formulation.
Q4: Does Sipomer SEM-25 require neutralization before use?
A: Yes — as an alkali-swellable polymer, SEM-25 relies on neutralization (typically with ammonia, sodium hydroxide, or organic amines) to ionize carboxylic groups and enable full viscosity development. Optimal thickening occurs at pH values above 7.5, with peak performance often observed between pH 8.0 and 9.5.
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