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Troubleshooting guide



 

Transport and handling

1、Please store ALPASTE indoors keeping off the direct sunshine or heat source. " Please avoid excess impact/vibration, turning-over, rolling-over and falling-down.

2、The organic solvent, which is added a little in excess for maintaining the quality (of dispersibility), may sometimes bleed out onto the surface and change the state of products in the container (by means of separation). It gives no problem to the quality of ALPASTE. Use it after uniformly agitating.

3、" There is the possibility that the container is broken, the organic solvent is volatilized and/or the rain drops/impurities are inter-mixed, which results in the decrease of dispersibility or other problems.

 
 
Storage

1、Please store ALPASTE indoors keeping off the direct sunshine or heat source.

In the case of

lower temperature:Fatty acid is crystallized.

higher temperature:It is possible to decrease the dispersibility or cause the swelling of can by expansion of the solvent.

2、Please Store it closing the container tightly if it is once opened. Otherwise, it is resulted in poor dispersibility by means of evaporation of organic solvent or of moisture absorption, or in contamination with impurities.

 
 
 

Separation of solvent

1、Separation means the situation where the organic solvent, which is added a little in excess to maintain the quality(of dispersibility ), bleeds onto the surface.

2、It may be caused when the impact or vibration is given to the container in excess.

3、It is known to happen when the container is transported after being long left in high temperature condition or in the case of being subdivided.

4、Such phenomenon does not mean the deterioration of ALPASTE. It can be used after agitating well till it is mixed up uniformly. It is qualitatively no problem.

 
 
 

Poor dispersion

◆ The dispersion deficiency may be caused by the factors mentioned in the "Storage & Transport" that is because the organic solvent is evaporated or the rain-drops or impurities are inter-mixed when the can is broken or the can lid is not tightly closed.

◆ It is recommendable to use up ALPASTE as fast as possible, especially when a part of contents is taken out and the open space of can inside becomes bigger or when the treated grade in which easy evaporative solvent is included.

 
 
 

PCompatibility of ALPASTE
In general, the mineral spirit is used as the base solvent of ALPASTE. The main component of mineral spirit is a hydrocarbon type solvent. And consequently, the resin may be separated depending on the formulation. In such a case, the following measures may be effective

1、Pre-dispersion with proper solvent:

ex.) Pre-disperse ALPASTE with same volume of polar solvent as that of ALPASTE. Then it becomes almost completely compatible with the Acrylic resin.

2、Adding solvent to ALPASTE:(mixed base with mineral spirit and other solvent)

ex.) There are some mixture bases with toluene, xylene, IPA or glycol type solvent.

3、Solvent change of ALPASTE:

ex.) It can be substituted with toluene,ink oil or glycol type.

4、Addition of surfactant:

Nonionic surfactant can be added

 
 
 

Gas release problem of waterborne paint

Please refer to Japan Toyal website for solutions of this problem.

 
 
 

Poor gross(seeding/poor dispersion)
Poor gross is the phenomena when aluminium flakes in the paint/ink are partly put out of the dried coating surface and the smooth metallic paint surface cannot be obtained. In general, it is thought to be resulted from the following problems:

1、aluminium flakes themselves are bigger than the coating film thickness.

2、aluminium flakes are not enough dispersed and coagulated in the paint/ink due to some factor(of ALPASTE itself or during dispersion of paint/ink).

 

Counter measure:

1、Check if the proper particle size of ALPASTE is used.

For example, our ALPASTE used for automotive coatings (of which coating thickness is about 15?m) is cut through the screen of 400 mesh (with 37?m opening).

2、In case of the trouble by poor-dispersion or coagulation, please refer to the item "Poor Dispersion"