Octadecylamine polyoxyethylene ether AC-1812 (CAS: 26635-75-6) is a nonionic surfactant, appearing as a light yellow to yellow paste or viscous liquid. Its HLB value is about 13.5, with good water dispersibility and excellent emulsifying, dispersing, and antistatic properties. The product is in paste form at room temperature (melting point about 30~40°C). It is recommended to heat it to 40~50°C to melt or soften it before use for accurate weighing and uniform dispersion. Since the product has an active content of ≥99%, it can be added directly to the formula system or pre-dispersed into a solution of a certain concentration with warm water (40~60°C) before addition, which facilitates rapid and uniform distribution in the system.
Under acidic conditions, the tertiary amine group in AC-1812 will protonate and exhibit cationic characteristics. Therefore, if the formula requires its cationic functions (such as adsorption on negatively charged surfaces, antistatic properties), it is recommended to adjust the system pH to an acidic range (pH 4~6). Under neutral or alkaline conditions, the product mainly exhibits nonionic characteristics and has better compatibility with other nonionic and anionic auxiliaries. The product cloud point is ≥90°C (1% aqueous solution), providing excellent stability in high temperature high pressure dyeing processes.
AC-1812 is a low-foam product with moderate foaming performance, which is advantageous in processes requiring low foam. Its surface tension is about 30~35 mN\/m (25°C), and the critical micelle concentration (CMC) is about 0.01~0.1 g\/L (25°C), indicating that it can exert surface activity at low concentrations. In practical applications, the dosage should be calculated as a weight percentage of the formula system. It is recommended to start with a lower dosage and gradually optimize to achieve the most cost-effective effect.
Recommended reference dosages (based on total formula weight) for different application fields are as follows:
| Application Field | Recommended Dosage | Key Usage Points |
|---|---|---|
| Textile high temperature high pressure leveling | 0.5%~2% | Add directly to dye bath, or pre-disperse before addition; use in the same bath with disperse dyes |
| Synthetic fiber spinning oil | 5%~15% | As one component of the oil, compounded with other smoothing agents and emulsifiers |
| Internal antistatic agent for plastics | 0.3%~2% | Mix with resin pellets and extrude into granules, or directly process by injection\/blow molding |
| Metal cleaning and corrosion inhibition | 1%~5% | Prepare cleaning working solution, used with acid washing or neutral cleaning processes |
| Pesticide emulsifier | 2%~8% | Used to prepare emulsifiable concentrates or microemulsions; better effect when compounded with anionic emulsifiers |
| Leather fatliquoring and leveling | 0.5%~3% | Add to fatliquoring agent or dyeing bath to improve leather feel and color uniformity |
| Paper deinking | 0.1%~0.5% (based on absolutely dry waste paper) | Add to the deinking pulping section, synergizing with other deinking chemicals |
Note: The above dosages are industry generic reference ranges. The actual optimal dosage should be determined through experiments based on specific raw materials, equipment, and process conditions. Guoli Chemical recommends conducting small-scale tests before launching new formulas or processes.
In water-based formulas, the following operation procedure is recommended: Heat an appropriate amount of deionized water to 50~60°C, slowly add the measured AC-1812 under stirring, stir for 15~30 minutes until completely dispersed and dissolved, then cool the solution for later use. If compounding with other surfactants, they can be added together during this process. In oil-based systems or plastic processing, the melted AC-1812 can be directly mixed with base oil or resin until uniform.