Production and Applications of Naphthalene Sulfonate Water Reducing Agent
The price of nickel and stainless steel rose together. Nickel afternoon hand in hand with stainless steel together turn red up. Due to the temporary easing of geopolitical risks, risk assets are now picking up, nonferrous metals, stock markets, and so on have risen, the overall mood has temporarily improved. Ore prices are strong, the overlay of the epidemic on spot logistics or the formation of a certain impact. Phase, nickel and stainless steel materials to maintain high wide concussion pattern.
Nickel prices based on low inventory, tight supply and demand will still show high wide fluctuations. In addition, the current LME has low liquidity, so its sensitivity to capital will remain relatively high. Shanghai nickel-wide fluctuations are expected to continue in the 200,000-250,000 yuan wide repeated fluctuation trend. While stainless steel is affected by the stronger nickel pig iron, the cost support continues, but note that under the current demand is not effectively released, the upward space may also be affected, the stage is expected to fluctuate between 20000 and 22,000 yuan. The price of nickel produced such fluctuations, indicating that the price of the Water Reducing Agent may also be affected to a certain extent.
Introduction to Naphthalene Sulfonate Water Reducing Agent:
It is the product of naphthalene sulfonated by sulfuric acid and then condensed with formaldehyde, which belongs to an anionic surfactant. The appearance of this kind of water-reducing agent depending on different products is light yellow to dark brown powder. It is soluble in water and has a good dispersing effect on many powder materials such as cement. The water reduction rate is 25%.
Preparation method of Naphthalene Sulfonate Water Reducing Agent:
The synthetic route of naphthalene sulfonate superplasticizer is as follows:
naphthalene → sulfonation → hydrolysis → condensation → neutralization → filtration → drying → product
The raw material for production is naphthalene. First, the sulfonation reaction is carried out with concentrated sulfuric acid. The mole ratio of naphthalene to sulfuric acid is 1:1.3-1.4. The reaction temperature was 160 - 165℃ and the reaction time was 3h. Then the reactants were cooled to 120℃ for hydrolysis. At this time, naphthalene sulfonic acid was stable, while naphthalene sulfonic acid was easy to hydrolyze, thus reducing the amount of naphthalene sulfonic acid to facilitate the next polycondensation reaction. The hydrolysis time was about 30min. The condensation reaction is an important reaction in the production of a naphthalene sulfonate water reducer. At a certain temperature, the sulfonated naphthalene was condensed with formaldehyde to form a polymer compound. This reaction strongly affects the performance of the product. In order to find the optimal process parameters, the effects of condensation time, condensation temperature, and the ratio of formaldehyde and naphthalene on product properties were investigated by means of uniform design. The optimal temperature condition is 104℃. The optimal reaction time was 6h. The optimal condition of formaldehyde dosage is 0.75. The maximum expected theoretical value is 18.3.
Industrial production process of Naphthalene Sulfonate Water Reducing Agent:
(1) naphthalene: Naphthalene is solid at room temperature, and it is necessary to put naphthalene into the naphthalene kettle for heating and melting.
(2) sulfonation: The sulfonation process is to add concentrated sulfuric acid to the sulfonation kettle and react with it to produce naphthalene sulfonic acid. There are two types of naphthalene sulfonic acid: α -naphthalene sulfonic acid and β -naphthalene sulfonic acid.
(3) hydrolysis: As α -naphthalene sulfonic acid is produced in the sulfonation reaction, its presence is not conducive to the condensation reaction, so it needs to add water to hydrolyze α -naphthalene sulfonic acid.
(4) condensation: After the end of hydrolysis reaction to condensation kettle drop formaldehyde, and β -naphthalene sulfonic acid reaction to generate naphthalene sulfonated formaldehyde condensation.
(5) neutralization: After condensation, the material enters the neutralization kettle, drops liquid alkali, neutralizes the excess sulfuric acid in the sulfonation reaction, and stops dropping when the PH reaches 7-9.
The control system mainly monitors the production status of four different reaction reactors and their batching tanks. The production line can also carry out four production lines at the same time. Taking production line A as an example, there are one naphthalene reactor, two sulfonation reactors, four condensation reactors, and one neutralization reactor. Each reaction kettle has a feed valve, discharge valve, emptying valve, hot oil valve, cooling water valve, steam pressure valve, flush valve, etc., the reaction kettle with a raw material tank, two sulfonated kettles shared a sulfuric acid tank, every two condensation kettles would be equipped with a set of formaldehyde tank and dilution tank, each condensation kettle has a hydrolysis tank, liquid alkali tank to neutralize the alkali added drops in the kettle.
Applications of Naphthalene Sulfonate Water Reducing Agent:
Naphthalene water-reducing agent is a kind of concrete additive invented by Dr. Hwab Kenichi in Japan in 1962. It is a kind of chemical synthetic product of naphthalene sulfonate formaldehyde condensation, with industrial naphthalene, concentrated sulfuric acid, formaldehyde, and alkali as the main raw material. Adding a naphthalene water-reducing agent to concrete can not only improve the strength of concrete but also improve its various properties, such as wear resistance, corrosion resistance, permeability resistance, etc. Therefore, naphthalene water-reducing agent is widely used in roads, bridges, tunnels, docks, civil buildings, and other industries.
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