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Skip to content Polyethylene polyamine (PEPA) is a cold curing hardener for epoxy resins and compositions. It is a mixture of ethylene amines.
PEPA is completely soluble in water and in alcohol, leaving no residue, forms salts with acids. Absorb moisture and CO2 from the air.
CAS. No: 68131-73-7, EU No: 268-626-9
For curing epoxy resins, from 5% to 30% of PEPA is required by weight of the resin, depending on the type of work, the average recommended ratio is 1:10.
The resin and hardener bonding should be processed at a temperature of at least +20°C.
Gelling time is about 1,5 hours, and the time of full curing is 24 hours.
Forbids to mix a large amount of resin with a hardener immediately, without using special mixing machines to avoid an effervescence.
With a lack of hardener, the resin remains uncured and does not gain the required mechanical properties; with an excess of hardener, curing proceeds very quickly, and the forming polymer becomes fragile.
Heating considerably accelerates the curing process. As self-curing occurs with the calorification (heat emission), when preparing large dose of resin with a hardener, self-heating of the mixture is possible, accompanied by foaming and rapid solidification.
To reduce the brittleness of cured epoxy products, they are plasticized by adding 15-20% (by weight) of dibutyl phthalate or other plasticizers to the resin.
Note: The exact amount of hardener and the viability of the composition are determined experimentally by the user, depending on the field of application, the weight of the fill, the curing mode, the presence and type of filler, etc.
When fiberglass products manufacturing, it is recommended to make a test sample for each batch of resin and hardener.
Recommended curing conditions for a composition containing 10 mass parts of PEPA and 100 mass parts of epoxy resin ED-20 (21% of epoxy groups):
Store in a tightly closed container in a dark place at an ambient temperature from+15 to +40°C away from acids (anhydrides), oxidants, epichlorohydrin, water, sources of fire. PEPA is hygroscopic and, forming a solution with water, is partially hydrolyzed. Therefore, PEPA must be stored in air-tight containers.
The guaranteed shelf life in original container is 24 months.
Storage over the date specified on the label does not necessarily mean the product is unusable. In case, if store more please check the properties of product before use.
polymer canisters with a capacity of up to 25 dm3;
polyethylene drums with a capacity of up to 50 dm3;
steel barrels with a capacity of up to 200 dm3;
steel barrels with a capacity of 220 dm3.
Precautions: Store in a sealed container away from acids (anhydrides), oxidizing agents, epichlorohydrin, water, and sources of fire.
Use in premises equipped with flow-exhaust ventilation, use personal protective equipment.
It has pronounced alkaline properties and is toxic. Vapors of polyethylene polyamine cause irritation of the upper respiratory tract, in some people allergic dermatitis.
Detailed instructions are given in the relevant product safety data sheet. It can be provided upon request.
| Parameter name and measure unit | Standard |
|---|---|
| Appearance | From light yellow to dark brown color fluid without mechanical inclusions, with a sharp smell of ammonia. A greenish color is allowed. Well soluble in water and alcohol, absorbs moisture from the air and carbon dioxide. |
| Density, kg/m3 | 950 – 1050 |
| Mass fraction of total nitrogen, %, min | 30.0 |
| Mass fraction of mineral impurities, %, max | 0.2 |
| Mass fraction of water, %, max | 2.0 |
