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Polyacrylic acid (PAA) physical and chemical properties and preparation method

 Last Update: 2021-12-09
 Source: Internet
 Author: User

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Polyacrylic acid (PAA)

[Structural formula]

[Physical and chemical properties] Colorless or light yellow liquid

[Preparation method] Adopt solution polymerization method, take acrylic acid as raw material, dilute with water, and polymerize under the action of initiator

The stoichiometry of water was added to the deionized equipped with electric stirrer, reflux condenser, a dropping funnel and a thermometer, a stirring was started and the reaction temperature was raised to about 80 ℃, the measurement of thioglycolic acid or of isopropanol was added Miscible with water into the reactor

Add 8g acrylic acid and 2g acrylonitrile to 60mL water, add 0.

The purpose of adding HNO ₃ in the above reaction is to solubilize, because polyacrylonitrile is a water-insoluble substance, and the copolymer is also a turbid solution.

[Technical Index] GB/T 10533-2000

[application]

(1) Polyacrylic acid is the earliest homopolymer of polycarboxylic acid products

(2) Polyacrylic acid has CaCO ₃ resistance, 1mg/L polyacrylic acid can tether 45mg/L calcium ions, and CaCO ₃ resistance is better than general polycarboxylic acid copolymers, but there is almost no resistance to Ca ₃ (PO ₄ ) ₂ ability

(3) This product is often used as a compound water stabilizer with a corrosion inhibitor

(4) The relative molecular weight of polyacrylic acid used in water treatment agents is generally 2500-5000.

Related Links: Preparation and Application of Polymeric Scale Inhibitor and Dispersant

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