In addition to the monofunctional epoxies described under resins, products with active hydrogens, such as furfuryl alcohol, coal tars, or phenols, will react with the epoxy resins
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Table 2 Epoxy Curing Agents
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Usage
|
Uncatalyzed
|
HDT
|
|
|
Curing agent
|
(phr)a
|
cure (°C)
|
(°C)
|
Applications
|
|
Aliphatic primary amines
|
|
|
|
|
|
Diethylene triamine
|
10-12
|
Ambient
|
80-100
|
Short pot life
|
|
Tetraethylene pentamine
|
13-15
|
Ambient
|
|
Ambient curing
|
|
|
|
|
systems
|
|
Diethylamine propylamine
|
5-8
|
40-80
|
|
|
|
n-Aminoethyl piperazine Aromatic primary amines
|
22-25
|
Ambient
|
|
|
|
m-Phenylene diamine
|
12-15
|
60-100
|
150-180
|
Longer-pot-life
|
|
|
|
|
general-purpose
expoxies
|
|
Methylene dianiline Tertiary amines
|
25-28
|
60-100
|
|
|
|
Benzyl dimethylamine
|
6-10
|
60-100
|
80-100
|
Catalysts, especially
|
|
|
|
|
with polysulfide
|
|
Tris (dimethylaminomethyl)
|
3-6
|
20-60
|
|
|
|
phenol
|
|
|
|
|
|
Amides
|
|
|
|
|
|
Dicyandiamide
|
3-5
|
120-160
|
120
|
Latent catalysts for
|
|
|
|
|
one-pack epoxies
|
|
Acids
|
|
|
|
|
|
Boron trifluoride
|
2-4
|
120-150
|
175
|
Heat-resistant epoxies
|
|
monoethylamine Oxalic acid
|
5-10
|
120-160
|
60-120
|
Catalyst for
|
|
|
|
|
anhydrides
|
|
Anhydrides
|
|
|
|
|
|
Phthalic anhydride
|
60-80
|
120-140
|
120-150
|
Encapsulation
|
|
Maleic anhydride
|
50-80
|
80-120
|
|
|
aDGEBA epoxy of EEW 200.
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to form part of the cured structure. Triphenyl phosphite both reacts and accelerates. Lactams also react with the hardeners. Since all these products tend to degrade the performance of the cured product, it is preferable to use difunctional low-viscosity epoxies to reduce viscosity. Where applicable, functionality of reactive diluents must be allowed for when calculating ratios.
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15 сентября, 2015 
Malyar 
Опубликовано в рубрике 