Product Overview

S-300 is a hydrophobic nano-scale fumed alumina c for powder coatings, which can improve the fluidity of powders and the storage stability of powder coatings.

Product Features

Improve fluidity and increase powder coating rate.
Improve the storage stability of powder coating and keep the powder loose
Improve the uniformity of powder charging and increase the spraying area
Reduce the moisture absorption of powder coating.

Product Parameters

Appearance	Average primary particle size	Bulk density
white powder	30nm	68kg/m³

Directions

This product can be directly added to the finished powder and sieved with 80 mesh or above, or added when the flakes are crushed.

Dosage

0.1%-0.2% of the total formula

Application in powder coating

Whether the powder coating is positively or negatively charged, its static charge will not be adversely affected. The commonly used addition amount is less than 0.2%, which not only greatly improves the fluidity and storage stability of the powder coating, but also the hydrophobic aluminum oxide C has a certain moisture resistance, so the powder coating using hydrophobic aluminum oxide C can have a long-lasting charge.

Notice

Excessive addition may have a small effect on the color of dark colors such as black and bright colors.
Due to the large oil absorption, the larger the amount added, the more it will affect the leveling of the powder coating during curing.
The package that has not been used up must be tied to prevent moisture

Packing: 5KG/box

S-300 Nano-hydrophobic Fumed Alumina C Experiment

1.Method of adding S-300 and corresponding experiments

Take 250g of black highlight powder, black matte powder and extra-fine black gauze powder without any additives each time, add S-300 nano-fumed alumina C at 0.1% and 0.2% respectively, shake well, sieve and shake well again.

Spray the plate through a 180-mesh sieve and test the sample.
Place each powder with S-300 added in an oven set at 45°C for one week and observe the agglomeration.
Measure the flow index of each powder separately.

The flow test equipment and operation process are shown in the figure below:

Flow index test method:

According to the flow index test method, the flow index of various materials after adding S-300 was measured.

2.Experimental data and summary are as follows

item	Black high-glossy powder			Black matte powder			Extra fine black sandy powder
S-300 addition	0	0.1%	0.2%	0	0.1%	0.2%	0	0.1%	0.2%
Flow Index	70.2	151.8	163.8	65.1	158.3	169.5	66	151.1	163
Gloss 60°	84%	82.8%	82.5%	9%	9.1%	8.8%	10%	10.3%	10.4%
Film thickness（μm）	60-80	60-80	60-80	60-80	60-80	60-80	50-70	50-70	50-70
Appearance	good	good	good	good	good	good	texture	texture	texture
Impact on leveling	none	none	none	none	none	none	——	——	——
Particles	none	none	none	none	none	none	——	——	——
White spots	none	none	none	none	none	none	none	none	none
Agglomeration at 45°C/168H	Small Block	Slightly small pieces	loose	Clustering	Small Block	Small Block	Small Block	Slightly small pieces	loose
Summarize	1. The recommended addition amount is: 0.1-0.2%. The flow index after adding S-300 is related to the flow index of the powder itself (which is related to the resin content, particle size, specific gravity, etc.), the addition amount, the addition method and uniformity, etc. Generally, the flow effect of the powder with a flow index between 140-160 is relatively good. Therefore, the actual addition amount of S-300 can be appropriately adjusted according to the measured flow index of the powder after addition. Generally, when 0.1% is added, the flow value will increase a lot. 2. In high-gloss powder, the gloss has a very small effect, and other powders have basically no effect. 3. In flat powder, it is best to add as evenly as possible, and it has basically no effect on leveling 4. No particles, white spots and other bad phenomena. 5. Excessive addition may have a small effect on the color in dark colors such as black and bright colors. 6. Through the 45℃/168H experiment, the powder storage and agglomeration of powders have been significantly improved 7. According to the experimental data results, under the same amount of addition, the addition of S-300 is better than the commonly used aluminum oxide C in improving the fluidity of powder coatings.

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