How to Make Super Absorbent Polymer
22/04/2019The Principle of Superabsorbent Polymers
20/05/2019
Sodium Polyacrylate
DefinitionSodium Polyacrylate is a new type of functional polymer material and an important chemical product. Its solid product is white (or light yellow) lumps or powder, and the liquid product is a colorless (or light yellow) viscous liquid. It is soluble in cold water, warm water, glycerin, propylene glycol, and other media. It‘s a surfactant with many special properties.
Name:Sodium Polyacrylate
CAS No:9003-04-7
Molecular Formula:(C3H3NaO2)n
Refractive Index:nD20 1.43
Density:1.32g/mLat 25°C
Application
Sodium polyacrylate has different uses because of its relative molecular weight. Sodium polyacrylate (106-107) with high molecular weight is used as flocculant and super absorbent polymer. It is used as a flocculant in the following areas: natural water clarification, removal of phosphate in sewage, separation of red mud from alumina, and use as a soil amendment. Sodium polyacrylate water-absorbent resin is a new type of functional polymer material widely developed and researched at home and abroad in recent years. It is a kind of strong hydrophilic polymer compound with a loose network structure and low cross-linking degree. Water absorption and water retention performance, non-toxic and odorless, widely used in medical and health, petrochemical and soil water retention. Medium relative molecular weight sodium polyacrylate (104 ～ 106) can be used as thickener and water retention agent, low relative molecular weight sodium polyacrylate (103 ～ 104) can be used as dispersant and scale inhibitor, ultra-relatively low molecular weight ( 700) The use of sodium polyacrylate has not yet been fully developed.
Sodium polyacrylate has different uses because of its relative molecular weight. Sodium polyacrylate (106-107) with high molecular weight is used as flocculant and super absorbent polymer. It is used as a flocculant in the following areas: natural water clarification, removal of phosphate in sewage, separation of red mud from alumina, and use as a soil amendment. Sodium polyacrylate water-absorbent resin is a new type of functional polymer material widely developed and researched at home and abroad in recent years. It is a kind of strong hydrophilic polymer compound with a loose network structure and low cross-linking degree. Water absorption and water retention performance, non-toxic and odorless, widely used in medical and health, petrochemical and soil water retention. Medium relative molecular weight sodium polyacrylate (104 ～ 106) can be used as thickener and water retention agent, low relative molecular weight sodium polyacrylate (103 ～ 104) can be used as dispersant and scale inhibitor, ultra-relatively low molecular weight ( 700) The use of sodium polyacrylate has not yet been fully developed.
Application Field
Sanitary napkins ,adult diaper and baby diapers;
Water-based paint, play a dispersing role;
Textile printing and dyeing auxiliary, play the role of slurry dispersion;
Auxiliary of ceramic processing, which plays a dispersing role;
As a washing aid in detergents, it has a dispersion effect; anti-fouling redeposition effect and thickening effect;
Crystal mud, which can absorb water.
Process Route And Its Synthesis Method
The production process of sodium polyacrylate is as follows.
1. Aggregation method
Firstly, acrylic acid and caustic soda are reacted to produce sodium acrylate monomer, and then the monomer is polymerized into sodium polyacrylate under the trigger of persulfate and reducing agent.
2. Neutralization Law
First, acrylic acid is polymerized into polyacrylic acid under the action of a redox agent, and then polyacrylic acid is neutralized with caustic soda to produce sodium polyacrylate.
3. Saponification method
First, methyl acrylate is formed by the reaction of acrylic acid and methanol, and the suspension or latex after polymerization of methyl acrylate is heated in an aqueous solution of sodium hydroxide to prepare sodium polyacrylate.
4. Hydrolysis method
First, acrylamide is polymerized to produce polyacrylamide, and then polyacrylamide is hydrolyzed to produce sodium polyacrylate under alkaline conditions.
Source: Organized from the Internet.
Reference materials:
1. Sodium polyacrylate. chemicalbook
2. Synthesis of sodium polyacrylate and its research progress. Paper Network