Emulan OP 25
Emulan OP 25
Emulan OP 25 in an Alkylphenol ethoxylate is used in the emulsion polymerization.
Emulan OP 25 acts as a high-performance oil in water type of emulsifier.
Emulan OP 25 offers stabilization of emulsions, dispersions and latices against thermal, mechanical and chemical effects.
Emulan OP 25 can be used alone or in combination with anionic emulifiers such as Emulphor OPS 25 or with cationic emulsifiers in emulsion polymerization processes.
Emulan OP 25 is used in emulsion polymerization processes for many different types of monomer such as acrylic esters, styrene and vinyl compounds (with 1-5% addition level).
Emulan OP 25 is also used for emulsifying ester waxes and fatty acids (with 5-15% addition level) and disperse systems (with 0.5-5% addition level).
Cloud point (EN 1890)*
Method A°C ––––––
Method B°C approx. 88
Method C°C approx. 74
Method D°C approx. 92
Method E°C approx. 93
pH (EN 1262, Solution B): approx. 7
Dropping point (DIN 51801)°C: approx. 37
Congealing point (ISO 2207)°C: approx. 26
Melting point °C: approx. 37
Viscosity (EN 12092, Brookfield LVT) 60 °C: approx. 100 mPa·s
Acid value (ISO 2114) mg KOH/g : approx. 0
Saponification value (ISO 3681) mg KOH/g: approx. 0
Surface tension (EN 14370, 1 g/l surfactant in distilled water, 23 °C): approx. 39 mN/m
Hydrophilic-lipophilic balance (W.C. Griffin): approx. 17
* Cloud point according to EN 1890:
Method A: 1 g of surfactant + 100 g of distilled water
Method B: 1 g of surfactant + 100 g of NaCl solution (c = 50 g/l)
Method C: 1 g of surfactant + 100 g of NaCl solution (c = 100 g/l)
Method D: 5 g of surfactant + 45 g of diethylene glycol monobutyl ether solution (c = 250 g/l)
Method E: 5 g of surfactant + 25 g of diethylene glycol monobutyl ether solution (c = 250 g/l)
** The pH of the Emulan® types can decrease during storage, but this does not have any effect on their performance.
*** Applying Harkins-Jordan correction.
Storage
a) The Emulan® types should be stored in their original packaging, which should be kept tightly sealed, in a dry place.
Store rooms must not be overheated.
b) Avoid a humid environment, because the products are hygroscopic and, being readily soluble in water, absorb moisture immediately.
For this reason, it is advisable to reseal drums tightly without delay each time material is taken from them.
c) The congealing points of the Emulan® types must be taken into consideration when determining the storage temperature.
d) The Emulan® types can become slightly cloudy if they are stored at low temperatures, but this has no effect on the product properties.
The cloudiness can be reversed at 50 – 60 °C.
e) Product that has solidified or that shows signs of precipitation should be heated to 50 – 70 °C and homogenized before use.
f) Product in drums that has solidified or that shows signs of precipitation should be melted or heated gently in a heating cabinet or heated chamber; the temperature should not exceed 50 – 70 °C, depending on the particular congealing or melting point.
This also applies if electric drum heaters are used.
Internal electrical elements are unsuitable for heating owing to the high heat load in some places.
g) If the Emulan® types are stored in heated tanks at 50 –70 °C (depending on the particular congealing or melting point), care must be taken to ensure that they do not come into contact with air (blanket with nitrogen).
Constant gentle stirring prevents them from overheating or becoming discoloured as a result of prolonged contact with the heating elements or external heating jacket.
h) Emulan® OG should be stored in a dry place at a temperature not exceeding 25 – 30 °C. Materials
Tanks made of the following materials are suitable for the storage of Emulan® types:
a) V2A stainless steel (1.4541 or X6 CrNiTi 1810)
b) V4A stainless steel (1.4571 or X6 CrNiMoTi 17122)
Shelf life
The Emulan® types have a shelf-life of at least 24 months, provided they are stored in their original packaging and kept tightly sealed.
