News Details
Isopropenyl ester coatings crosslinking agent
2017-4-11 22:30:12
Isopropenyl ester coatings crosslinking agent, such as adipate isopropenyl ester, was put forward by Murray et al in 1995. Under acid condition it can quickly react with aqueous polymer containing hydroxyl, crosslinking curing. Available at more than 100 ℃ crosslinking, good solvent resistance of the film.
Coating appear orange peel the causes of this phenomenon is more, the cause of disease is caused by the surface tension changes film, one of the causes is: when coating is dry, with the evaporation of the solvent, wet coating surface concentration (solid), temperature drop, the higher surface tension.
The wet coating surface and bottom surface tension is different, so produce a great impetus, make the paint from the bottom upward movement, the movement causes local vortex, forming boehner, vortex flow origin as the volcano eruption outward from the lower coating, the low surface tension coating into the surrounding surface tension is high, so forming uplift area. And make wet film forming rules of hexagonal, the edge of the center and the pigment concentration is different. Flow property is bad, dry film will leave uneven orange peel defect.
In addition to the surface tension factor, there are improper, such as the distance of the spray gun, ratio of solvent and paint is not appropriate, bad paint spray, etc all can cause the generation of orange peel defect. This is due to the atomized droplets undergo a longer distance, has been volatile solvent after more to get to the coated surface, then the droplet solidification degree is high, the surface tension also becomes larger, down to the wet coating can spread out, and wet coating coating can automatically to the small droplet spreading around, then these small droplets becomes the high slope and formed dry film orange peel.
In summary, the main reason for the coating appear orange peel phenomenon:
Reason: 1. The environment temperature is too high, the working environment there is wind, and the wind speed is too large.
2. The substrate reasons: the coated surfaces uneven, affect the paint flow flat.
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).
3. Construction reasons: spraying distance and air pressure is insufficient, paint spray is bad; Small gun caliber, high viscosity of coating; Air pressure is too large, spraying distance too close; Bottom, paint don't match, curing agent to join too much; Spraying quantity is not enough.
4. Products: thinner, how quickly evaporate.
Orange peel phenomenon of solution:
1. Pay attention to the construction environment, high temperature avoiding the sunshine, windy weather.
2. Ensure that the coated surfaces is flat and level.
(3) adjust spraying distance and air pressure and the atomizing effect is appropriate.
4. Add the rheological modifier or flow ping agent, adjust the coating rheological property, to extend the time of coating leveling, make its have good flow property.
5. Add high LHB value of wetting agent, to reduce the interface between the polymer and fillers, improve the coating flow property.
6. Choose matching bottom paint, correct proportion.
7. Closed good base material, reduce the moisture content in the coating and the penetration, make dry slowly and evenly.
Select the suitable diluent. 8.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Coating appear orange peel the causes of this phenomenon is more, the cause of disease is caused by the surface tension changes film, one of the causes is: when coating is dry, with the evaporation of the solvent, wet coating surface concentration (solid), temperature drop, the higher surface tension.
The wet coating surface and bottom surface tension is different, so produce a great impetus, make the paint from the bottom upward movement, the movement causes local vortex, forming boehner, vortex flow origin as the volcano eruption outward from the lower coating, the low surface tension coating into the surrounding surface tension is high, so forming uplift area. And make wet film forming rules of hexagonal, the edge of the center and the pigment concentration is different. Flow property is bad, dry film will leave uneven orange peel defect.
In addition to the surface tension factor, there are improper, such as the distance of the spray gun, ratio of solvent and paint is not appropriate, bad paint spray, etc all can cause the generation of orange peel defect. This is due to the atomized droplets undergo a longer distance, has been volatile solvent after more to get to the coated surface, then the droplet solidification degree is high, the surface tension also becomes larger, down to the wet coating can spread out, and wet coating coating can automatically to the small droplet spreading around, then these small droplets becomes the high slope and formed dry film orange peel.
In summary, the main reason for the coating appear orange peel phenomenon:
Reason: 1. The environment temperature is too high, the working environment there is wind, and the wind speed is too large.
2. The substrate reasons: the coated surfaces uneven, affect the paint flow flat.
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).
3. Construction reasons: spraying distance and air pressure is insufficient, paint spray is bad; Small gun caliber, high viscosity of coating; Air pressure is too large, spraying distance too close; Bottom, paint don't match, curing agent to join too much; Spraying quantity is not enough.
4. Products: thinner, how quickly evaporate.
Orange peel phenomenon of solution:
1. Pay attention to the construction environment, high temperature avoiding the sunshine, windy weather.
2. Ensure that the coated surfaces is flat and level.
(3) adjust spraying distance and air pressure and the atomizing effect is appropriate.
4. Add the rheological modifier or flow ping agent, adjust the coating rheological property, to extend the time of coating leveling, make its have good flow property.
5. Add high LHB value of wetting agent, to reduce the interface between the polymer and fillers, improve the coating flow property.
6. Choose matching bottom paint, correct proportion.
7. Closed good base material, reduce the moisture content in the coating and the penetration, make dry slowly and evenly.
Select the suitable diluent. 8.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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