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Quality testing method of Re-dispersible polymer powder

Quality testing method of Re-dispersible polymer powder

 

Re-dispersible polymer powder

Re-dispersible polymer powder

The first step to see the appearance

First take out the sample on top of the white paper, a cell phone to open the flashlight another cell phone to play the camera function to send a large look at the appearance of the irregular white powder particles, there are highlights of different colors and round powder isadulterated

The second part of the smell to determine the emulsion

First weigh 10 grams of polymer powder 10 grams of water in a glass slowly to stir, smell its smell, similar to the taste of white latex is VAE emulsion latex powder. Vinegar sour taste is vinyl acetate emulsion, if a little pungent or oil taste is synthetic emulsion . 

The third part of the point iodine volt, test whether there is starch

 Buy a bottle of iodine from the drugstore, 3 drops in the glass, not too high and the mouth of the glass can be the same height, too high too deep is not too distinguishable. After the point of iodine volt waiting for changes, if discoloration or brown spots is not right, iodine volt will slowly dilute.

Fourth, do the film  

The film needs to do a comparison, several polymer powder factory samples at the same time to do experiments to compare, the same polymer powder the same area size is fair to anyone, The same 10 grams RDP powder and 10 grams of water, draw a circle of 10 centimeters, slowly pour it inside with a glass rod and then use a lighter to eliminate the air bubbles on the surface. The next day the film is dry, cut a strip of the same width from the middle to see the transparency of the film should be solid, hollow with air bubbles is a problem, if the same as the rubber band is wrong.The pulling process should be in the slow pulling force, and then slowly retract the rest of the film in a corner and do not care about it .Half a month later to see if there is still pulling.    

 The fifth part of the burning ash powder (burning residue)

In accordance with the provisions of GB/T7531. Weighing volume of 3g (accurate to 000g), burning temperature (9025)℃, burning time of 1h

 

Note: The difference between VAE emulsion polymer powder and vinyl acetate emulsion polymer powder and synthetic emulsions

VAE emulsions are called ethylene vinyl acetate copolymer emulsions in Chinese, and are binary copolymer emulsions: they have better water resistance, weatherability, and a glass transition temperature of -3 degrees (no construction below -3 degrees). Vinyl acetate emulsions and synthetic emulsions are unit emulsions without water resistance and weatherability and weathering resistance, and the glass transition temperature is 5 degrees (below 5 degrees can not be constructed)   

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