Pure polyester coating crosslinking agent

Pure polyester coating crosslinking agent,In this article, through pure epoxy, pure polyester powder coating are reviewed in this crosslinking agent powder by the steric (physical) before and after the modification of coating properties such as contrast, to explore the micro particle size of crosslinking agent on the properties of powder coatings.

Powder coating is a kind of environmental protection coating that is non-solvent and the average particle size is 35 micron, which is baked into film by electrostatic spraying. The main application is in electrical appliances, steel doors and Windows, metal cases and other workpieces. As the powder coating market constantly to develop and penetration, powder coatings manufacturers pay more attention to eliminate coating defects, improve coating roughness, decrease the temperature of coating crosslinked (energy saving), to achieve these, all related to choose proper crosslinking agent.

Through the different physical and chemical methods to the surface modification of crosslinking agent, to a certain extent change particles on the surface of the crystal structure to improve its reactivity, improving its dispersibility in the matrix, reinforcing and matrix interface binding force, achieve the goal of powder surface modification.

Solids are "activated" to varying degrees of mechanical force, such as friction, shear force and impact. If the system changes only physical properties and its composition and structure are invariant, it is called mechanical activation; If the structure or chemical composition of the material changes at the same time, it is called chemical activation.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


When mechanical force is very strong, so that the critical time is short of the formation of cracks in the mechanical action of the cracks of time, or the size of the particles by mechanical force is less than the formation of critical crack size, does not crack, and will produce plastic deformation and the accumulation of various defects, is the process of mechanical activation.

Micro particles due to the slip between the particles in the aggregate, the elastic deformation of particles and particle on the surface of the powders produced by lattice defects, the structure of the grain boundary irregular stress appears, the reduced fracture. The granularity of the particle will no longer change even after it reaches the crushing equilibrium; But it works on particles

The mechanical energy will destroy the crystalline structure of the particles, and the lattice strain and lattice disturbance increase. Due to the mechanical activation, the activity of the reactants was enhanced, and the apparent activation of the chemical reaction was greatly reduced, resulting in a significant increase in the reaction rate constant.

Crosslinking agent by strong mechanical action purpose with mechanical method was carried out on the powder surface activation, to a certain extent, change the particles on the surface of the crystal structure, dissolving properties (surface amorphization), chemical adsorption and reactivity (increasing surface active or reactive), etc., so as to increase the compatibility with matrix and wettability, improving its dispersibility in the matrix, reinforcing and matrix interface binding force, achieve the goal of powder surface modification.
Instruments: the European and American gram-106 laser particle size analyzer, shock meter, bending tester, double screw extruder, electrostatic spray gun, thermostat oven

Powder coating paint film preparation: after mixing the formula obtained beforehand, the melt extrusion, crushing, sieving, and then to spray on tinplate, respectively in different temperature and time of baking in the oven crosslinking, namely model.

The preparation of the coating was carried out according to GB/T 1727-1992. The film's impact resistance was determined by GB/T 1732-1993. The film's flexibility was measured by GB/T 1731-1993. The film adhesion is carried out in GB/T 9286-1998.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

Diethyl toluene diamine(DETDA)  http://www.yaruichem.com