Types of epoxy resin hardener is introduced

epoxy resin hardener type introduces multivariate amine hardener - fat epoxy resin cured with excellent mechanical properties, electrical properties, chemical resistance, and thus widely used. hardener is one of the epoxy resin curing the necessary raw materials, otherwise will not curing epoxy resin. As to meet the needs of various applications, you should use the corresponding hardener. There are many kinds of hardener, are presented below:

Ethylenediamine EDA H2NCH2CH2NH2 60 active hydrogen equivalent molecular weight 15 colourless liquid Resin with 6-8 per 100 standard of performance: toxic and irritant smell, volatile, low viscosity, fast curing at room temperature. Used for bonding, pouring and coating. The amine with the increase of molecular weight, viscosity increases, the volatile and toxic decreases, and performance improvement. But they put a big heat, it is suitable for the shorter period. In general the smaller the higher the molecular weight they affected by the match the amount. Long-term exposure to multiple amine fat can cause dermatitis, their steam highly toxic, must be very careful when operating.

Divinyl three amine DETA H2NC2H4NHC2H4NH2 molecular weight active hydrogen equivalent colourless liquid 20.6 per 100 103 standard resin with 8 to 11. Curing: 20 ℃ + 100 ℃ for 30 minutes or 2 hours 20 ℃ for 4 days. Performance: the applicable period of 50 grams of 25 ℃ for 45 minutes, thermal deformation temperature of 95-124 ℃, the bending strength of 1000-1160 kg/cm2, the compressive strength of 1120 kg/cm2, the tensile strength of 780 kg/cm2, elongation is 5.5%, the impact strength 0.4 ft - pounds/rockwell hardness of 99-108. Dielectric constant (50 hz, 23 ℃), power factor 4.1 (50 hz, 23 ℃) 0.009 volume resistance 2 x1016 Ω - cm at room temperature curing, toxicity, heat quantity, suitable period is short.

Triethylene tetramine TETA H2NC2H4NHC2H4NHC2H4NH2 molecular weight 146 active hydrogen equivalent 24.3 colorless viscous liquid Every 100 standard resin with 10 to 13 of curing: 20 ℃ + 100 ℃ for 30 minutes or 2 hours 20 ℃ for 7 days. Performance: the applicable period of 50 grams of 25 ℃ for 45 minutes, thermal deformation temperature of 98-124 ℃, the bending strength of 950-1200 kg/cm2, the compressive strength of 1100 kg/cm2, the tensile strength of 780 kg/cm2, elongation is 4.4%, the impact strength 0.4 ft - pounds/rockwell hardness of 99-106. Room temperature curing, toxicity was slightly lower than divinyl three amine, put a big heat, it is suitable for short.

Four ethylene five amine TEPA H2NC2H4 (NHC2H4) 3 nh2 molecular weight 189 active hydrogen equivalent 27 brown liquid Resin with 11-15 per 100 standard performance.

More ethylene polyamine PEPA H2NC2H4 NHC2H4 nNH2 light yellow liquid Resin with 14 to 15 per 100 standard of performance: the lower toxicity, low volatile, applicable period is longer, and cheap.

Two propylene three amine DPTA H2N (CH2) 3 NH (CH2) 3 nh2 molecular weight 131 active hydrogen equivalent 26 light yellow liquid Resin with 12 to 15 per 100 standard performance with TETA.

Dimethylamino propylamine DMAPA (CH3) 2 n (CH2) 3 nh2 low viscosity liquid Resin with 4 to 7 per 100 standard bigger toxicity, curing and two catalytic reaction, good adhesion, flexibility, long shelf life.

Diethylamine base propylamine DEAPA (C2H5) 2 n (CH2) 3 nh2 molecular weight 130 active hydrogen equivalent 65 low viscosity liquid Every 100 standard resin with 4 to 8 of curing: 60-70 ℃ for 4 hours. Performance: the applicable period of 50 grams of 25 ℃ for 4 hours, heat distortion temperature 78-94 ℃, 920-1050 kg/cm2, compressive strength tensile strength of 480-640 kg/cm2, the impact strength of 0.2 feet - pounds per inch Rockwell hardness of 90-90. Dielectric constant (50 hz, 23 ℃), power factor 3.75 (50 hz, 23 ℃) 0.007 medium temperature cure, low temperature performance is good.

Trimethyl six methylene diamine TMD (H2N) 2 (C6H9) (CH3) 3 colourless liquid cold curing, long period and low toxicity. Every 100 standard resin with 21 curing: + 80 ℃ 80 ℃ for 1 hour, 2 hours. Performance: the applicable period 400 grams of 50 minutes 25 ℃ and 50 ℃ for 10 minutes, Martin heat resistant 92 ℃, bending strength, 1150 kg/cm2, the impact strength of 20 kg - 0.0009 cm/cm2 tg delta (23 ℃, and 100 c/S) surface resistance 5.4 x1011 Ω (300 v) volume resistance 9 x1015 Ω. Cm (300 v) in the curing temperature, low temperature performance is good.

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Specific mehtod use of silane coupling agent

How to use silane coupling agent Specificly, here are two specific method of use

(1) Pre-packing method

The solid filler into the blender (high-speed solid mixer HENSHEL (Henschel) or V-type solid mixer, etc.), and the silane solution is sprayed directly on the packing and mixing, the higher the speed, the better dispersion. General stirring for 10-30 minutes (slower, longer), filler treatment after drying should be at 120 degrees Celsius (2 hours).

(2) an aqueous solution of a silane coupling agent

(Glass fiber surface treating agent): glass fiber surface treatment agent normally comprises: a film forming agent, an antistatic agent, a surfactant, a coupling agent, water. The coupling agent is generally used in an amount of 0.3% -2% of the total treatment agent glass surfaces, the first aqueous solution 5 times with an organic acid or salt PH value is adjusted to a certain value, under sufficient stirring, a silane was added until clear, then adding the remaining ingredients, for poorly soluble silane, isopropyl alcohol available solubilization. In the drawing process in the glass surface treatment agent is sprayed on the glass and dried to remove the solvent and water.

(3) underside Act

5% -20% of the silane coupling agent was the same described above, by coating, brushing, spraying, dipping treatment substrate surface, to dry out at room temperature for 24 hours, preferably baked at 120 ℃ in 15 minutes.

(4) Direct Addition

Silane may be added directly to the filler / resin mixture, the resin and filler are mixed, the silane in the blend can be directly sprayed. Coupling agent is generally used in an amount of 0.1% -2% filler loading, (according to the diameter of the filler decision). Was then added over a silane resin / filler molding (extrusion, compression molding, coating and the like).