Sodium naphthalene sulfonate formaldehyde (SNF), also named poly naphthalene sulfonate (PNS) or sulphonated naphthalene formaldehyde, is light brown powder in appearance. As a commonly used high-efficiency water reducing agent for concrete, Its main chemical component is naphthalene sulfonate formaldehyde condensate. Sodium naphthalene has the characteristics of high water reduction rate, small impact on the setting time of concrete, and low air entrainment. Therefore, SNF is widely used in highways, bridges, dams, docks, tunnels, water conservancy and industrial and civil construction projects, steam curing and natural curing, prefabricated components, etc.
Naphthalene superplasticizer is the main raw material for various compound admixtures, such as pumping agent, retarding superplasticizer, early-strength superplasticizer, etc. It can be used for concrete construction where the daily minimum temperature is above 0℃, and can also be used to prepare high-fluidity concrete, high-strength concrete and steam-cured concrete.
|Solid Content (%) ≥||92%|
|Na2SO4 Content (%)≤||5||10||18|
|Chlorine Content (%)≤||0.3||0.4||0.5|
|Net Starch Fluidity(mm)≥||250||240||230|
|Water Reducing Rate(%)||26||25||23|
|Packing||25kg pp bag; 650kg Jumbo bag. A customized package is available.|
Main Performance Characteristics of Sodium Naphthalene Sulfonate
High water reduction rate. In most cases, the water reduction rate of SNF can reach more than 25%. It can effectively increase the fluidity of concrete, reduce bleeding and segregation, thereby improving the workability of concrete, making it easier to construct and compact.
Enhancement. Naphthalene series superplasticizer can significantly improve the strength and durability of concrete, especially for high-strength concrete and prestressed concrete.
Adaptable. It can be adapted to various specifications and models of cement. It has good compatibility with other admixtures, and can be matched with admixtures such as expansion agents, air-entraining agents, and active admixtures such as fly ash to complement and stimulate each other.
The setting time is appropriate. This product has little effect on the initial and final setting time of cement, and the difference in setting time is generally within 1 hour.
Low sodium sulfate content. In winter, SNF does not crystallize after being formulated into a liquid, thereby solving the problem of pipe blockage caused by sodium sulfate crystallization in winter concrete manufacturing, and greatly facilitating winter concrete construction.
Good durability. SNF can effectively improve the pore structure of concrete, thereby greatly improving the durability performance indicators of concrete such as impermeability, carbonation resistance, and freeze-thaw resistance.
Easy to use. SNF powder can be used directly, or it can be dissolved in water first and used as a solution-type admixture. It is suitable for various construction environments or mixer types.
(1) Oxidation of naphthalene. Use naphthalene and concentrated sulfuric acid to perform an oxidation reaction under certain conditions to generate naphthalene sulfonic acid.
(2) Formaldehyde condensation. The condensation reaction of naphthalene sulfonic acid and formaldehyde is carried out under certain conditions to generate the primary product of naphthalene series high-efficiency water reducing agent.
(3) Alkalize. Use alkaline substances such as sodium hydroxide to alkalize the primary product and adjust the pH value of the product.
(4) Dry. The alkalized product is dried to remove excess moisture.
(5) Crush packaging. The dried product is pulverized and packaged to make the finished product of snf superplasticizer.