Naphthalene sulfonate formaldehyde sodium salts
is synthesized from raw materials,crude naphthalene,sulfuric
acid,formaldehyde and caustic soda,etc.
So naphthalene sulfonate formaldehyde
sodium salts contains sodium sulfate.
Sodium sulfate has a feature:when working
temperatures drops to below 5 ℃,sodium
sulfate will crystallize,it oftern happens in winter
especially in cold region.the sodium sulfate crystals will has a negative
effect to concrete performance.SO try to remove this crystals thru filtration
or heat the solution,increase the temperatures,let the sodium sulfate crystal
dissolve in solution again. The best way is that change to use low sodium
sulfate contained naphthalene sulfonate formaldehyde sodium salts.
