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By Lzh | 09 February 2023 | 0 Comments

Why is water-reducing agent the most widely used in ready-mixed concrete?

What is water-reducing agent?
Water-reducing agent anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After adding the concrete mixture, it can disperse cement particles, improve its workability, reduce unit water consumption, and improve the fluidity of the concrete mixture, Or reduce the unit cement consumption and save cement.
Water reducer - naphthalene sulfonate water reducer
It is the first product used in China. It is the product of naphthalene sulfonated by sulfuric acid and then condensed with formaldehyde. It is an anionic surfactant. The appearance of this type of water reducer can be light yellow to dark brown powder, depending on the product. It is soluble in water. It has a good dispersion effect on many powder materials, such as cement, with a water reduction rate of 25%.
Preparation method of naphthalene sulfonate water-reducing agent
The synthesis route of naphthalene sulfonate water reducer 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 molar ratio of naphthalene to sulfuric acid is 1: 1.3-1.4. The temperature is 160-165 , and the reaction time is three h. Then, the reactant is cooled to 120 for hydrolysis. At this time, 13-naphthalene sulfonic acid is stable, while d-naphthalene sulfonic acid is easy to hydrolyze, thus reducing the amount of b-naphthalene sulfonic acid to facilitate the next condensation reaction; the hydrolysis time is about 30min. The condensation reaction is important in the production process of b-naphthalene sulfonate water-reducing agent. The sulfonated naphthalene and formaldehyde are condensed to form polymer compounds at a certain temperature. This reaction strongly affects the performance of the product. The uniform design method is used to investigate the condensation time and temperature to find the optimal process parameters. The ratio of formaldehyde and naphthalene affects the product's performance. The optimum temperature is 104 , The optimum reaction time condition is six h, and the optimum condition of formaldehyde dosage is 0.75; the maximum expected theoretical value is 18.3.
Application status of naphthalene sulfonate water reducer
The Naphthalene series water-reducing agent is a concrete additive invented by Dr. Kenichi Takabe of Japan in 1962. It is a synthetic chemical product of naphthalene sulfonate-formaldehyde condensate, with industrial naphthalene, concentrated sulfuric acid, formaldehyde, and alkali as the main raw materials. Adding a naphthalene series water-reducing agent to concrete can improve the strength of concrete and its various properties, such as abrasion resistance, corrosion resistance, permeability resistance, etc. Therefore, the naphthalene series water-reducing agent is widely used in highways and bridges, tunnels, harbors, civil construction, and other industries.
Price of water-reducing agent
Water-reducing agent particle size and purity will affect the product's price, and the purchase volume can also affect the cost of the water-reducing agent. A large amount of large amount will be lower. The price of the water-reducing agent can be found on our company's official website.
Water-reducing agent supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including water-reducing agents, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for a high-quality and cost-effective water-reducing agent, you are welcome to contact us or inquire at any time.

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