OP-21 is a white to light yellow paste or solid at room temperature (melting point about 45~50°C). Therefore, it is usually necessary to first warm it with warm water or heat it to give it a certain fluidity before feeding. As a nonionic surfactant with a high HLB value (16), it is highly soluble in water and is commonly used as an emulsifier, penetrant, or dispersant in most systems. It is recommended to slowly add it to the formulation in the form of a diluted solution under stirring conditions to ensure uniform dispersion and optimal performance.
Reference dosages vary across different industries: as a penetrant/scouring agent in textile printing and dyeing, the recommended dosage is usually 1~5 g/L (working solution concentration); in pesticide emulsifiable concentrate formulations, as an emulsifier, it typically accounts for 5%~15% of the total formula; for metal cleaning or hard surface cleaning, it is recommended to prepare a 0.5%~2% working solution; as a wetting dispersant in paint color pastes, the recommended dosage is 1%~5% of the pigment weight. The above recommended dosages are based on typical physical property data from the Guoli Chemical database. In actual use, optimization should be determined through experiments based on specific formulations and working conditions.
| Parameter Item | Value |
|---|---|
| Appearance | White to light yellow paste or solid |
| Ion Type | Nonionic |
| HLB Value | 16 |
| Active Content | ≥99% |
| pH of 1% Aqueous Solution (25°C) | 5.0~7.0 |
| Cloud Point | ≥100°C |
| Melting Point | About 45~50°C |
| Solubility in Water | Easily soluble in water |
| Surface Tension (25°C) | About 32 mN/m (Source: Guoli Chemical Product Database) |
Pretreatment and Dissolution: Before use, the packaging drum can be placed in a warm room or heated with a water bath (≤60°C) to soften. Avoid direct contact with hot surfaces when taking out. It is recommended to pre-dilute with part of the water or solvent in the formulation to form a 10%~20% slurry or solution, then slowly inject it into the mixing kettle under stirring. This can significantly improve dissolution speed and distribution uniformity.
Compatibility and Synergy: OP-21 is nonionic and can be compounded with anionic, cationic, and amphoteric surfactants in any proportion, showing excellent compatibility. In cleaning and degreasing formulations, it is often compounded with sodium linear alkylbenzene sulfonate (LAS), sodium alcohol ether sulfate (AES), etc., to enhance salt resistance and high-temperature detergency.