What are the properties of polycarboxylate?
Polycarboxylate superplasticizer is a kind of surfactant containing carboxyl grafted copolymer in molecules, and its unique molecular structure makes it have many unique advantages, such as low dosage, high water reduction rate, significant early strength growth, satisfactory keeping slump, no retarding, less impact on …
What are Superplasticizers made of?
Superplasticizers are synthetic polymers. Compounds used as superplasticizers include sulfonated naphthalene formaldehyde condensate, sulfonated melamine formaldehyde condensate, acetone formaldehyde condensate and polycarboxylate ethers.
How do you make polycarboxylate?
The preparation method comprises the following steps: adding unsaturated polyether methyl allyl polyoxyethylene ether, hydrogen peroxide and 2-acrylamide tetradecyl sulfonic acid into deionized water to prepare a base solution; dripping a solution A consisting of acrylic acid, methacrylic acid and a chain transfer …
What is polycarboxylate used for?
Polycarboxylates are used as builders in detergents. Their high chelating power, even at low concentrations, reduces deposits on the laundry and inhibits the crystal growth of calcite. Polycarboxylate ethers (PCE) are used as superplasticizers in concrete production.
Is polycarboxylate toxic?
Although polycarboxylates are not readily biodegraded in sewage treatment plants, surface water and the soil, they generally have extremely low toxicity. Polycarboxylates are toxic to warm blooded animals only in very high doses.
What is PCE based admixture?
PCE-10 is a new generation super- plasticizer based on polycarboxylate technology. This product is designed to provide medium to high water reduction, while providing excellent flow ability during placement, and excellent slump retention without affecting initial setting time.
Is polycarboxylate safe?
In summary, based on the available data, the human risk assessment considers the use of polycarboxylates in household laundry products and automatic dishwashing detergents as safe and of no concern with regard to consumer use.
Is polyacrylate a plastic?
Sodium polyacrylate is not considered to be a plastic. The family of polymers is a large one and includes materials other than plastics and resins. It is more often categorised as a superabsorbent material, it can absorb many times its own weight of water and hold it in creating a soft stable gel.
What is SNF based admixture?
Super plasticizers are chemical admixtures used where well-dispersed particle suspension is required. Among these admixtures, super plasticizer poly carboxylic ether (PCE) and naphthalene formaldehyde sulphonate (SNF) has great market relevance.
What is admixture and its type?
Admixtures are classed according to function. There are five distinct classes of chemical admixtures: air-entraining, water-reducing, retarding, accelerating, and plasticizers (superplasticizers).