Risk aversion plunged on the positive news of the Russia-Ukraine talks. After several days of rising oil prices, the price of precious metals continued to fall. Domestic futures markets remain stable for the time being.
Back in international markets, WTI crude futures briefly dipped below $100 a barrel, while Brent crude hit its lowest intraday level in nearly two weeks. Spot gold briefly fell below $1,900 an ounce. Comex gold futures closed down 1.1 percent at $1,918.4 an ounce. Comex silver futures closed down 1.14 percent at $24.91 an ounce. "Recently, crude oil prices have been extremely sensitive to changes in geopolitical news." Traders believe that the current oil price is still in the broad impact, Ukraine will still be a premium in the case, although the market further decline, but should not be too pessimistic, it is recommended to wait and see for the time being. The Ukrainian premium is still there and there will be some volatility in the water reducer market.
Water reducing agents can be divided into ordinary water-reducing agents (also known as the plasticizing agent, whose water reducing rate is not less than 8%, represented by lignin sulfonic acid salts), high-efficient water-reducing agents (also called superplasticizer, whose water reducing rate is not less than 14%, including naphthalene, melamine, amino sulfonic acid salt, aliphatic, etc.) and high-performance water reducing agent (the water reducing rate is not less than 25%, represented by the polycarboxylate water-reducing agent).
Following is an introduction to five kinds of water-reducing agents.
Sulfamate High-efficient Water Reducing Agent:
The chemical name is aromatic amino sulfonate polymer. The production process is to use sodium aminobenzene sulfonic acid, and phenol as raw material, through addition, and the polycondensation reaction, a kind of polymerization of oita polymers will be produced. The water-reducing rate can reach 30%. The cost is relatively high, and it is easy to bleed. When used in combination with the naphthalene series high efficient water reducing agent, it can solve the problem of the naphthalene series high efficient water reducing agent and compatibility of cement.
Sulfamate superplasticizer is a kind of monocyclic aromatic hydrocarbon type superplasticizer, mainly composed of p-sulfamate and monocyclic aromatic hydrocarbon derivatives. Phenol compounds will be combined with formaldehyde under acidic or alkaline conditions heat condensation.
The molecular structure of sulfamic acid superplasticizer is complex, and different monomers will have different molecular structures.
The synthesis process is through the sulfamate superplasticizer and polyoxyeolefin compound polycondensation or with other compounds, such as lignosulfonate, catalytic graft to modify the sulfamate superplasticizer. The sulfamate series water reducing agent modified by polyoxy olefins polycondensation combines the advantages of polycarboxylate series and sulfamate series water reducing agent and has good working performance and early strength, but the raw material price is expensive and the production cost is high.
The graft copolymerization of lignosulfonate and sulfamic acid superplasticizer can reduce the production cost and improve the segregation and bleeding of sulfamic acid superplasticizer.
Fatty Acids High-efficient Water-reducing Agents:
The chemical name is aliphatic hydroxyl sulfonate polymer. The raw materials are mainly acetone, formaldehyde, Na2SO3, Na2S2O5, catalyst, etc. It is brownish-red liquid. The water reduction rate can reach 20%, and it can be used for low-grade concrete and will make concrete stain.
HSB aliphatic superplasticizer
HSB (High Strence Bing) is a carbonyl pyroaldehyde synthesized by sulfonation of polymer. Hydrophobic main chain for aliphatic hydrocarbons, it does not pollute the environment and does not damage human health. It has wide applicability to cement, obvious concrete enhancement effect, and small slump loss. Under conditions of low temperature, there is no sodium sulfate crystallization phenomenon. It is widely used in the preparation of pumping agents, delay setting, early strength, antifreeze, air, and other kinds of individual water reducing agents, and can also be used with naphthalene series water reducing agent, amino water reducing agent, polycarboxylate water reducing agent compound.
1. High water reduction rate. Dosage is 1-2%, the water reduction rate is up to 15-25%. Under the condition of the same strength slump, adding HSB can save cement consumption by 25-30%.
2. Early strength and obvious enhancement effect. Concrete mixed with HSB can reach 60-70% of the design strength in three days, 100% in seven days, and 30-40% higher than blank concrete strength in 28 days.
3. High plastic. Concrete slump loss is small, with almost no loss for 60 min and 10-20% for 90 min;
4. Wide applicability to cement, workability, and good cohesion. Good compatibility with other kinds of admixtures;
5. It can significantly improve the freeze-thaw resistance, seepage resistance, sulfate resistance of concrete, and comprehensively improve the other physical properties of concrete;
6. It is especially suitable for the following concrete: flow plasticized concrete, natural curing, steam curing concrete, impermeable waterproof concrete, durable freeze-thaw resistant concrete, sulfate resistant Marine engineering concrete, and reinforced concrete, prestressed concrete;
7. HSB is non-toxic, non-flammable, non-corrosive to steel bars, and has no sodium sulfate crystals in winter.
It is a new type of high-performance water reducing agent, which has an excellent water reduction rate, fluidity, and permeability. Obviously, it can enhance the strength of cement mortar, but the production process is complex, and the general price is higher.
It is a biopolymer made from milk precipitated with acid and dried in a cylinder.
Suppliers of Concrete Additives
TRUNNANO is a reliable concrete additives supplier with over 12-year experience in nano-building energy conservation and nanotechnology development. If you are looking for high-quality concrete additives, please feel free to contact us and send an inquiry. (email@example.com)
We accept payment via Credit Card, T/T, West Union, and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
Russia is a major supplier of industrial metals such as nickel, aluminium and palladium. Russia and Ukraine are both major wheat exporters, and Russia and Belarus produce large amounts of potash, an input to fertiliser. The price and market of the water reducer will fluctuate under its influence. Prices of these goods have been rising since 2022 and are now likely to rise further because of the Russia-Ukraine conflict. Russia is a major supplier of industrial metals such as nickel, aluminium and palladium. Russia and Ukraine are both major wheat exporters, and Russia and Belarus produce large amounts of potash, an input to fertiliser. The price and market of the water reducer will fluctuate under its influence. Prices of these goods have been rising since 2022 and are now likely to rise further because of the Russia-Ukraine conflict.
In international trade, the indirect and local inspection of import and export commodities is closely related to the vital interests of buyers and sellers, as it involves inspection rights, inspection agencies and related claims.…
According to reports, a few days ago, a case about the alleged abuse of animals in livestock transportation ended in the captain's conviction, and the shipowner and the beneficiary cargo owner were not criminally punished.…
FCL by sea is similar to LCL LCL, except that the FCL is self-picked up to the factory to compete for logistics warehouse packing, while LCL is to row the goods to the designated assembly yard competition warehouse, and the assembly yard will pick up…