What's the effect of curing agent? Where can I use it? A processing aid that solidifies a substance. For example, curing agent is one of the necessary materials for epoxy resin curing, otherwise epoxy resin will not solidify. In order to meet the requirements of various application fields, the corresponding curing agent should be used. There are many kinds of curing agents, which are introduced below:

Aliphatic polyamine

ethylenediamine

EDA, H2NCH2CH2NH2, molecular weight 60, active hydrogen equivalent 15, colorless liquid, 6-8 copies per 100 standard resin

Properties: toxic, irritating, odor, volatile, low viscosity, quick curing at room temperature. Used for bonding, pouring, coating. As the molecular weight increases, the viscosity increases, the volatility decreases, the toxicity decreases, and the performance increases. But they are large in heat and short in application. In general, the greater their molecular weight, the smaller the amount of coordination. Long term exposure to fats and polyamines causes dermatitis, which is highly toxic and requires great attention during operation.

Two ethylene three amines

DETA, H2NC2H4NHC2H4NH2, molecular weight 103, active hydrogen equivalent 20.6, colorless liquid

8-11 copies per 100 standard resins. Curing: 20, 2 hours, +100, 30 minutes or 20 days, 4 days. Properties: 50 grams, 25 minutes, 45 minutes, hot deformation temperature 95-124, flexural strength 1000-1160kg/cm2, compressive strength 1120kg/cm2, tensile strength 780kg/cm2, elongation 5.5%, impact strength

0.4 foot lb / inch Rockwell hardness 99-108. Dielectric constant (50 Hz, 23 DEG C), 4.1 power factor (50 Hz, 23 DEG C), 0.009 volume resistance 2x1016

Omega -cm is cured at normal temperature, with high toxicity, large heat release and short application period.

Three ethylene, four amines, TETA, H2NC2H4NHC2H4NHC2H4NH2

Molecular weight 146, active hydrogen equivalent 24.3, colorless viscous liquid, 10-13 copies per 100 standard resin

Curing: 20, 2 hours, +100, 30 minutes or 20 days, 7 days. Properties: 50 grams, 25 minutes, 45 minutes, hot deformation temperature 98-124, flexural strength 950-1200kg/cm2, compressive strength 1100kg/cm2, tensile strength 780kg/cm2, elongation 4.4%, impact strength

0.4 foot lb / inch Rockwell hardness 99-106. Curing at room temperature, toxicity ratio of two ethylene, three amines, slightly lower, large heat release, short application period.

Four ethylene, five amines, TEPA

H2NC2H4 (NHC2H4) 3NH2, molecular weight 189, active hydrogen equivalent 27, brown liquid, 11-15 copies per 100 standard resin

Performance ibid.

Polyethylene polyamine PEPA, H2NC2H4 (NHC2H4) nNH2, pale yellow liquid, 14-15 copies per 100 standard resin

Properties: low toxicity, low volatility, long service life and low price.

Two propylene, three amines, DPTA, H2N (CH2) 3, NH (CH2) 3NH2

Molecular weight 131, active hydrogen equivalent, 26 light yellow liquid, 12-15 standard resin per 100, same performance as TETA.

Two methylamine DMAPA

(CH3) 2N (CH2) 3NH2 low viscosity transparent liquid, 4-7 copies per 100 standard resin

Toxicity is greater, with curing and catalytic two reactions, good adhesion, flexibility, and long duration.

DEAPA (C2H5) 2N diethylamino amine

(CH2) 3NH2 molecular weight 130, active hydrogen equivalent 65, low viscosity transparent liquid, 4-8 copies per 100 standard resin

Curing: 4 hours, 60-70 hours. Performance: suitable for 50 grams, 25 hours, 4 hours, thermal deformation temperature 78-94, compressive strength 920-1050kg/cm2, tensile strength 480-640kg/cm2, impact strength

0.2 foot lb / inch Rockwell hardness 90-98. Dielectric constant (50 Hz, 23 DEG C) 3.75 power factor (50 Hz, 23 DEG C) 0.007

Medium temperature curing, low temperature performance.

Three methyl, six methylene, two amines, TMD (H2N) 2 (C6H9) (CH3) 3 colorless liquid

Cold curing, long duration, low toxicity. 21 copies per 100 standard resins

Curing: 1 hours at 80, +150, 2 hours. Performance: suitable for 400 grams, 25 minutes, 50 minutes, or 50 minutes, 10 minutes, Martin heat resistance 92 degrees, bending strength 1150kg/cm2, impact strength

20Kg-cm/cm2, TG, delta 0.0009 (23, 100C/S)

Surface resistance 5.4x1011 (300V), volume resistance 9x1015, Omega.Cm (300V), medium temperature curing, low temperature performance.

Two already base three amine

H2N (CH2) 6 NH (CH2) 6NH2

Two amines modified, AMINE248 formula, unknown transparent liquid

Viscosity 25 DEG 1000-3000cps, 100 standard resin per 4-8, curing at room temperature -100 DEG C. Less toxic and flexible.

Two amine adduct

CH-2 and L2505 formula, unknown amine value 160-210, low viscosity transparent liquid, 65 copies per 100 standard resin

CH3

Amine value 400-500, low viscosity transparent liquid, 60 copies per 100 standard resin

Two amines, HDA, H2N (CH2) 6NH2, molecular weight 116

Active hydrogen equivalent 29 colorless sheet, crystalline melting point 42 DEG C, 12-15 copies per 100 standard resin

High toxicity, can be cured at room temperature, but not good. The application period is short.

Three methyl, two amines, 158 molecular weight, 20-25 copies per 100 standard resin

Curing: 20, 2 hours, +100, 30 minutes or 20 days, 7 days. Properties: 50 grams, 25 minutes, 45 minutes, hot deformation temperature 105, flexural strength 1150kg/cm2, tensile strength 650kg/cm2, elongation 4.4%, impact strength

0.4 feet lb / inch. Dielectric constant (50 Hz, 23 DEG C), 4 power factor (50 Hz, 23 DEG C), 0.001 volume resistance 9x1015

Omega -cm

Two ethylamine, DEA, HN (C2H5) 2, molecular weight 73, active hydrogen equivalent 73, colorless liquid, 12 copies per 100 standard resin

Two reactions with curing and catalysis.

Polyether two amine H2N (CH2) nO (CH2CH2O) mNH2

A substance that promotes or regulates the curing reaction