"JIAFA" EPOXY RESIN

　

Epoxy resin and hardener for heavy anticorrosive powder coating

 　

       This resin is a kind of phenol novolac type epoxy resin, which has good anticorrosive powder and heat-resistance. The hardener is consists of macromolecular polymer capped with hydroxyl group and catalyst, which has excellent flexibility and higher reactivity. The heavy anticorrosive powder coatings made from these resin and hardener can be used in various anticorrosive painting such as petrol, natural gas pipes, pollution water pipes, steel rod used in building engineering etc.
 1.Technical data of resin and curing agent
    
   Epoxy resin
Grade Epoxy value mol/100g Soften point ℃ Color max Gardner description
JECP-01A 0.105-0.115 95-105 ≦2

Phenol-novolac type epoxy resin good corrosion-proof
JE-CP-02A 0.110-0.120 90-100 ≦2

Modified Phenol-novolac type epoxy resin, price is lower
      Hardener
Grade Hydroxyl value mol/100g Soften point ℃

Viscosity* Pa.s25℃

 Color Gardner (max)
JECP-01B 0.33-0.40 90-100 240-400 ≦2
JE-CP-02B 0.31-0.36 90-100 240-400 ≦2
*40%glycolmonobutylether solution.
 2.Powder coating Composition Formulations
       Component Formulation Resin hardener Titanium dioxide Benzoin Filler and Pigment Leveling agent
1 JECP-01A 100 JECP-01B 25-27 5.0 0.5 55-65 0.5-1.0
2 JECP-02A 100 JECP-02B 24-26 5.0 0.5 55-65 0.5-1.0
 3.Formulation Thermal feature

Properties
No
Gel time (S) Full Cure time (S)  Suggestion of curing condition
1 210℃ 230℃ 210℃ 230℃ 210℃ (S) 230℃(S)
2 15-25 10-20 100-120 70-90 120-150 90-100
Test method Thermal plate DSC 　
  DSC curves of curing process

230℃ isothermal curing

Constant heat Dynamitic curing
 4.Process of manufacture powder coating and painting

A polymer melt mixing head, preheated to 130.degree. C. Was charged with a mixture of epoxy resin, hardener, leveling agent, benzoin, filler and pigment, and subsequently premixed. The resulting mixture is then extruded in a double screw extruder, the temperature in the center of the extrusion chamber being from 100℃-110℃. The extrudate is cooled rapidly to room temperature and comminuted using a precutting mill. The resulting mixture is ground in an impact mill to give a powder having an average particle diameter of from 30-40μm, and is screened through a sieve having a pore size of 125 μm.

The powder coatings prepared as above are applied electrostatically to degreased steel panels or pipes. After the application the panels or pipes are stoved for 3 minutes at 200℃. The stoved coating films have a film thickness of from 300 to 400μm. They are notable in particular for their high flexibility with a high degree of hardness (pencil hardness: 3H-5H,espicily in anticorrosive power.).

 5.Properties of cured coating film
item index

Appearance

neat, fluent, the color and luster is even, have no blowing blister, no crack and hole.

24 h or 48 h cathode removal

3

28 d cathode removal

4

bending (-30℃)

have no crack

resistance to chemical corrosion*

have no fade, swell up, soften, crack, removal

impact resistance 1.5J(-30℃)

have no leaking point

Cross section porosity (class)

2

bonded face porosity (class)

2

electricity strength (MV/m)

38

volume electric resistance ( Ω . m)

5.0x10-13

24 h or 48 h adhesive strength (class)

1
*Corrosive medium:

1.thinner hydrogen chlorine solution, PH value 2.5-3.5,

2.10%sodium chlorine and thinner sulfuric acid ,PH value 2.5-3.5.

3.10% water solution of sodium chlorine.

4.distillate water.

5.5%water solution of sodium hydroxide;

6.watersolution made from equal mass of Mg(CO3)2 and Ca(CO3)2.

 6.Packing, conveyance and storage

Packing: 25 KGs inside lining-plastics paper bag packing.

Storage: The epoxy resin and hardener can be Stored and transported as the no dangerous goods, it was better  stored in the original packing inside at 2-40 ℃, placed in the cool and well ventilated place, isolated the fire sources,  kept off the hot resource, avoided the direct irradiation of sunlight. Commonly, the product storage period is one year. After the period, it still can be used if the examination is qualified.

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