Sodium naphthalene sulfonate formaldehyde (SNF), also known as SNF superplasticizer, naphthalene based superplasticizer, sodium naphthalene, naphthalene sulfonate, poly naphthalene sulfonate (PNS), sodium naphthalene formaldehyde, sulphonated naphthalene formaldehyde, naphthalene sulfonate formaldehyde (NSF), is a chemically synthesized non-air-entraining high-efficiency water reducer. The appearance is the light brown powder.
As a kind of concrete superplasticizer, SNF powder has a strong dispersing effect on cement particles and the higher water reduction rate (15%～25%). So it can be widely used in the construction industry. Especially for the preparation of large-flow concrete, cast-in-place concrete and prefabricated components with early strength and high strength requirements, sodium naphthalene has a good use effect and can comprehensively improve and improve various properties of concrete. In addition, SNF superplasticizer is also highly utilized in various industries such as agriculture, plastics and rubber, papermaking, textiles and petroleum, etc.
SNF Powder
- Product: Sodium Naphthalene Sulfonate
- Appearance: Light Brown Powder
- Type: SNF-A, SNF-B, SNF-C
- Solid Content (%) ≥: 92
- PH Value: 7~9
- CAS No.: 36290-04-7
- HS Code: 38244010
Sodium Naphthalene Sulfonate in Concrete
Naphthalene series superplasticizer and some other chemical admixtures play an important role in modern concrete materials and technologies, which can improve various properties of concrete and promote the development of new concrete technologies. When used with mineral admixtures at the same time, sodium naphthalene formaldehyde can promote the utilization of industrial by-products (such as ground slag and fly ash, etc.) in the cementitious material system, which helps to save resources and protect the environment. With the continuous search for more low-cost, environmentally compatible materials and technologies, it is expected that naphthalene superplasticizer will play an important role in future concrete production.
Sodium naphthalene sulfonate (SNF) is easily soluble in water, ethylene glycol, diethylene glycol, slightly soluble in alcohols, and insoluble in organic solvents. In construction industry, sodium naphthalene sulphonate is widely used to prepare free-flowing and pumpable concrete mixtures. As a leading manufacturer of construction chemicals in China, Kingsun naphthalene sulfonate powder for sale has three types, they are SNF-A, SNF-B, SNF-C. And they all have different technical specifications (as shown in the table below).
| Type | SNF-A | SNF-B | SNF-C |
| Solid Content (%) ≥ | 92% | ||
| PH Value | 7-9 | ||
| 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. | ||
- High water reduction rate. The water reduction rate of sodium naphthalene can reach 25%. Superplasticization can effectively increase the fluidity of concrete, reduce bleeding and segregation, thereby improving the workability of concrete, facilitating construction and compaction.
- Good reinforcement effect. Under the condition of the same amount of cementitious materials, the 1d, 3d, 7d and 28d compressive strength of concrete mixed with high-efficiency water reducer can be increased by 50-110%, 40-90%, 40-70% and 20-40% compared with the benchmark concrete of the same period.
- Improve the workability of concrete. Adding SNF powder to concrete can not only save cement, improve the workability of concrete, but also speed up the construction progress.
- Reduce the amount of cement. When the concrete strength and slump are basically the same, the amount of cement can be reduced by 10-25%.
- Strong adaptability. SNF superplasticizer is suitable for cement of various specifications and models. The product has good compatibility with other admixtures, and cooperates with admixtures such as expansion agents, air entraining agents and active admixtures such as fly ash, and the functions complement and stimulate each other. Suitable setting time. The product has little effect on the initial and final setting time of cement, and the setting time difference is generally within 1h.
- Low sodium sulfate content. The naphthalene superplasticizer can be made into a liquid without crystallization in winter, which solves the problem of pipeline blockage caused by sodium sulfate crystallization in winter concrete manufacturing, and provides convenience for winter concrete construction. In addition, after compounding with the retarding component, the slump loss of concrete over time is small.
- Good durability. This product can effectively improve the pore structure of concrete, thereby greatly improving the durability performance indicators of concrete such as impermeability, carbonization resistance and freeze-thaw resistance.
- Good safety performance. Non-toxic, non-irritating and non-radioactive, does not contain substances that are harmful to steel corrosion; non-flammable and non-explosive, non-hazardous goods.
- Easy to use. The sodium naphthalene sulfonate superplasticizer can be used directly or dissolved in water first and used as a solution-type admixture, which is suitable for various construction environments or mixer types.
- This chemical is suitable for many types of cement. Such as Portland cement, ordinary Portland cement, Portland slag cement, Portland fly ash cement, etc.
- It has a good effect on preparing a variety of concretes. For example, high-strength concrete, high-performance concrete, steamed concrete, large-fluid concrete, pumped concrete, etc. Of course, it is also particularly suitable for concrete construction in winter.
- Kingsun SNF superplasticizer can be widely used in highways, bridges, tunnels, water conservancy and hydropower projects, ports, docks, skyscrapers, power engineering, industrial and civil buildings, prestressed components, etc.
Understand the product characteristics. SNF superplasticizer can significantly improve the fluidity and workability of concrete, while reducing water consumption and improving the strength and durability of concrete. Therefore, before use, we should carefully read the product manual to understand the product’s performance, dosage range, usage methods and precautions.
Determine the dosage. Determine the dosage of naphthalene sulfonate formaldehyde to the specific requirements of concrete, test conditions and water reduction requirements. Generally speaking, the dosage of SNF based admixture is usually 0.5% to 1% of the cement mass, and the recommended dosage is 0.7%. However, the specific dosage needs to be determined through experiments.
Solution method. Dissolve SNF superplasticizer powder in water according to the determined dosage to form a uniform solution. During the concrete mixing process, add the solution to the mixer along with the mixing water.
Dry doping. Add SNF powder directly to the mixer together with other concrete materials (such as cement, aggregate, etc.). Ensure that the water reducer powder can be fully mixed with other materials during the mixing process.
Stirring and mixing. Regardless of the method of addition, it should be ensured that the SNF sodium naphthalene sulfonate formaldehyde is evenly distributed in the concrete. Appropriately extend the mixing time to ensure the mixing effect. During use, the dosage of SNF high-efficiency water reducer should be strictly controlled to ensure accurate measurement.
Avoid mixing with other concrete admixtures. When using sodium naphthalene sulphonate, it should be avoided to mix with other types of concrete admixtures unless its compatibility is verified by special tests.
Construction and maintenance. During transportation and construction, care should be taken to prevent concrete from segregation and bleeding. According to the needs of the project, the slump and other properties of the concrete should be adjusted in time. In addition, determine reasonable maintenance conditions and systems to ensure the normal hardening and strength development of the concrete.
Storage conditions. This product should be stored in a dry, cool and ventilated dedicated warehouse to avoid rain and moisture.
In order to comprehensively improve the performance of the sodium naphthalene superplasticizer, the following methods need to be taken: adding an auxiliary admixture (compound) to the sodium naphthalene formaldehyde to alleviate its deficiencies. On the other hand, naphthalene superplasticizers can be optimized by changing molecular parameters (molecular weight, molecular weight distribution, degree of sulfonation) or replacing part of naphthalene with part of other compatible monomers to form a copolymer. So far, naphthalene-based composite products have been widely used, that is, adding appropriate retarder to naphthalene superplasticizers to reduce concrete slump loss; using copolymerization to improve the performance of naphthalene superplasticizer , this method is currently in the research and development stage.
- The content of Na2SO4 (3%-19%) within a certain range can improve the fluidity of cement paste. But if it exceeds this range, the fluidity of concrete will drop sharply.
- Generally, under the premise of a certain amount of water reducing agent, adding Na2SO4 can increase the early strength of concrete, but after 28d, its strength growth rate will decrease.
- When the content of Na2SO4 in SNF superplasticizer is increased, it can improve the fluidity of cement paste, the compressive and flexural strength of concrete, chloride ion penetration resistance and carbonization resistance. However, it may adversely affect the shrinkage and deformation properties of concrete.
- If the Na2SO4 content is increased in a lower range, the ability of the concrete to resist carbonization and chloride ion penetration can be improved.
- If excessive Na2SO4 is added to SNF, this will increase the alkali content in the concrete, accelerate the hydration, hardening and loss of water of the cement slurry, resulting in greater restraint stress and weakening the crack resistance.
1. Raw material selection and preparation
The main raw materials of SNF powder include naphthalene, formaldehyde, sulfonating agent, etc. These raw materials need to be selected from suppliers with high purity and stable quality to ensure the performance of the final product. In addition, the raw materials need to be pretreated before use, such as removing impurities and adjusting the particle size, to ensure the smooth progress of the reaction process and the stability of product quality.
2. Mixing and reaction
Accurately weigh various raw materials according to the established formula to ensure that the proportion of ingredients is accurate. Then send the prepared raw materials into the mixer for preliminary mixing to make the components evenly dispersed.
Under the action of appropriate temperature, pressure and catalyst, chemical reactions occur between the raw materials to generate intermediates with water reduction function. During the reaction, parameters such as temperature, time and stirring speed must be strictly controlled to ensure the completeness of the reaction and the quality of the product.
Polymerization and modification
The intermediates that have undergone preliminary reactions undergo polymerization under specific conditions to form polymer compounds. During the polymerization process, factors such as temperature, pressure, and reaction time must be controlled to obtain ideal molecular structure and performance.
In order to improve the water reduction effect and adaptability of sodium naphthalene powder, it is usually modified during or after polymerization. The selection and dosage of modifiers need to be determined according to product requirements and market demand.
Crushing and screening
Crushing: The products after polymerization modification are often in block or granular form, and need to be crushed into fine powder by a crusher. The crushing particle size needs to be controlled during the crushing process to meet the product specification requirements.
Screening: The crushed powder is screened to remove large particles and impurities that do not meet the specifications to ensure uniform product particle size and stable quality.
Drying and packaging
Drying: The screened powder is sent to the dryer for drying to remove residual moisture and volatile substances. The temperature and time need to be controlled during the drying process to avoid overheating or burning of the product.
Packaging: The dried SNF powder needs to be packaged with packaging materials with good sealing performance to prevent moisture absorption and contamination. The packaging quality needs to be checked during the packaging process to ensure that there is no damage or leakage.
Leading Sodium Naphthalene Manufacturer in China
As one of the most professional concrete admixtures manufacturers & suppliers in China, Henan Kingsun Chemical Co., Ltd. has focused on researching and producing various types of water reducing admixtures for more than 15 years. These conrete admixtures mainly include sodium gluconate (concrete retarder admixture), high range concrete superplasticizers (sodium naphthalene sulphonate and polycarboxylate superplasticizer), ordinary water reducing agents (sodium lignosulfonate and calcium lignosulfonate) and other chemicals. So if you are looking for a reliable manufacturer, Kingsun is your best choice.
- Kingsun has its own factory, fully automatic production lines, R&D center and quality inspection center, as well as a professional sales team.
- We also have many advantages, such as large warehouse, sufficient inventory, fast delivery. So our brand “Kingsun” has enjoyed a good reputation in domestic and foreign markets. There are many new and old foreign customers that are willing to establish long-term cooperative relations with our company.
- So far, our concrete superplasticizers have been exported to more than 30 countries and regions, including Mexico, Israel, Qatar, Bahrain, Pakistan, Chile, Brazil, Turkey, Saudi Arabia, United Arab Emirates, South Africa, Jordan, Russia, Peru, Bangladesh, South Korea, Indonesia, Thailand , Philippines, Vietnam, Malaysia, Singapore, India, etc.
- We always offer the high quality concrete superplasticizers, competitive factory prices and excellent services for all the customers. If you would like to know the SNF superplasticizer price, please contact us online any time. We also look forward to working with you!