Curing agent structural properties

The curing temperature of the curing agent is highly dependent on the heat resistance of the cured product. Similarly, in the same type of curing agent, although having the same functional group, the properties and the properties of the cured product are different depending on the chemical structure. Therefore, it is important to fully understand the properties and characteristics of polyamine curing agents having the same functional groups and different chemical structures.

In terms of hue, the alicyclic group is the lightest, substantially transparent, and the aliphatic and aromatic, the degree of coloration is quite remarkable. In terms of viscosity, there are also great differences. The alicyclic group is only a fraction of a few Pa·s, while the polyamide is very viscous, up to several Pa·s, and the aromatic amine is mostly solid. The length of the application period is exactly the opposite of the curability, the aliphatic reactivity is the highest, and the alicyclic, amide, and aromatic are sequentially reduced.

Hue: (excellent) alicyclic → aliphatic → amide → aromatic amine (inferior)

Maturity: (low) alicyclic → aliphatic → aromatic → amide (high)

Applicable period: (long) aromatic → amide → alicyclic → aliphatic (short)

Curability: (fast) aliphatic → alicyclic → amide → aromatic (slow)

Irritant: (strong) aliphatic → aromatic → alicyclic → amide (weak)

Chemical structure and properties of polyamine curing agents

In addition, it has a certain regularity in terms of gloss, flexibility, adhesion, acid resistance and water resistance.

Gloss: (excellent) aromatic → alicyclic → polyamide-fatty amine (inferior)

Softness: (soft) polyamide → aliphatic → alicyclic → aromatic (just)

Adhesive: (excellent) polyamide → alicyclic → aliphatic → aromatic (good)

Acid resistance: (excellent) aromatic → alicyclic → aliphatic → polyamide (inferior)

Water resistance: (excellent) polyamide → fatty amine → alicyclic amine → aromatic amine (good)

Chemical structure of polyamine curing agent and properties of cured product with bisphenol A resin

For gloss, aromatics are the best and aliphatics are the worst. This property is affected by the curing temperature, and the gloss becomes better as the temperature increases. As for the softness, the polyamide having a long distance between functional groups is more excellent, and the aromatic amine having a high crosslinking density is inferior. Heat resistance is the opposite of softness, and adhesion is consistent with softness. Chemical resistance (acid resistance) is affected by chemical structure, aromatic is relatively good, and fatty amines and polyamides are susceptible to chemical corrosion. The water resistance is governed by the concentration of the functional group, the polyamide having a low functional group concentration and high hydrophobicity is more resistant to water, and the aromatic having a higher functional group concentration is inferior.

Other Coal-based Activated Carbon

Coal Pellet Activated Carbon,Coal Activated Carbon,Pellet Activated Carbon

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