Product Description
The current situation of China's polyether monomer industry is briefly analyzed, and the varieties and market conditions of main polyether carboxylic acid monomers are introduced. Starting from the molecular structure of different monomers, the advantages and disadvantages of each monomer and its development direction were analyzed, and a new type of polycarboxylate water reducing agent, ethylene monomer polyethylene glycol ether (EPEG), was introduced.
Polycarboxylate superplasticizer is the latest generation of concrete admixture, known as the third generation of high-performance superplasticizer. Compared with naphthalene-based superplasticizers, polycarboxylate superplasticizers have the characteristics of high water-reducing rate and good adaptability to cement. At the same time, there is no waste water and waste gas in the production process of polycarboxylate superplasticizer, which is a green and environmentally friendly material.
Poly (carboxylic acid water reducing agent is has the attributes of the amphiphilic polymer, usually in a double bond at the end of the polyoxyethylene ether big monomer with unsaturated carboxylic acid small molecular monomers, under the effect of initiator, copolymerization reaction synthesis of monomer to the size of the side alkenyl main chain molecules are formed by copolymerization, polyether monomer of polyethylene glycol (peg) segment of side chain structure, the molecular structure as shown in figure
Compared with conventional water reducers, polycarboxylate water reducers have the characteristics of molecular structure design. The macromonomer end of the unsaturated double bond in the water reducing agent molecule generates the acid backbone of the polycarboxylic acid through the polymerization reaction. "Point anchorage", adsorbed on the surface of cement particles; the polyethylene glycol branches of macromonomers form a solvated polymer chain layer on the surface of cement particles through hydrogen bonding with water molecules. The steric hindrance effect is used to disperse the cement particles to achieve the water reduction effect. Therefore, the improvement of superplasticizer is inseparable from the substitution of macromonomer, and the improvement of macromonomer molecular structure can greatly improve the production process and product performance of polycarboxylate superplasticizer.
Quality Standard
| Appearance: | White or light yellow flaky solid |
| Unsaturation mmol/e: | ≧0.38 |
| Moisture: | ≦0.2% |
| Hydroxyl Value mg KOH/g: | 23.5±2.0, |
| PH value (1% water solution)： | 5.0-7.0 |
| Double Bond Retention: | ≧98% |
Storage and Transportation
Additive material Polyoxyethylene Ether TPEG 2400 is non-toxic, nonflammable and can be shipped as general chemical, stored at dry, ventilated place, away from sunshine and rain.
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