CAS number：9007-20-9
molecular formula：C15H17ClO3
molecular weight：280.74668
EINECS number：618-435-5

English synonyms

POLYACRYLIC ACID 5,000;POLYACRYLIC ACID 25,000;POLYACRYLIC ACID 250,000;POLYACRYLIC ACID 150,000;POLYACRYLIC ACID 1,000,000;CARBOMER 1622;CARBOMER 672;CARBOMER 690

Related categories

Raw materials; organic chemical raw materials; raw materials intermediates - raw materials; synthetic materials - materials; pharmaceutical excipients; carbomer; pharmaceutical excipients; thickener - carbomer; other reagents; cosmetic raw materials whitening effect; daily chemicals; medicine Raw materials; industrial raw materials; thickener raw materials; emulsifiers; pharmaceutical thickeners, daily chemical rheology modifiers; daily chemical rheology modifiers; skin external raw materials; preservatives; coenzymes; carbomers; daily chemicals- Cosmetic raw materials; additives; chemicals; UVCBs-polymer; Cosmetic Ingredients & Chemicals; organic chemicals; pharmaceutical thickeners; other; chemical raw materials; daily chemical raw materials; organic intermediates; cosmetic raw materials; chemical intermediates; thickeners; bulk ;Daily chemical raw materials;Daily chemicals;Organic raw materials;9007-20-9

Introduction

Polyacrylic acid, referred to as PAA, alias 2-acrylic acid homopolymer, acrylic resin coating, acrylic resin, acrylic monomer polymer, acrylic modified resin, acrylic resin emulsion, is a water-soluble acrylic polymer, also soluble In some polar solvents, such as methanol, dioxane and ethylene glycol. The ionization constant is 4.75. Because the molecule contains a large number of carboxyl groups, it can react with alkalis, alcohols and amines, and can also undergo dehydration, degradation and complexation reactions. It can be used as thickener, dispersant, flocculant, adhesive and film-forming agent, etc. It is widely used in coatings, plastics, papermaking, textiles, rubber, food, medicine, cosmetics and water treatment industries.

Chemical properties

Low molecular weight polyacrylic acid is a colorless and transparent solid. Its 20% to 30% aqueous solution is pale yellow or colorless viscous liquid. The molecular weight is 500～5000, and the pH value is 2～4. Its dissociation constant is about 5×10-5, which is similar to that of acetic acid (1.8×10-5), and is much larger than the first dissociation constant of carbonic acid. Therefore, polyacrylic acid is a weak acid stronger than carbonic acid. It is generally stable to strong acids, strong bases, and oxidants, but under high temperature or long-term light, low-molecular-weight polyacrylic acid will still repolymerize, so that its molecular weight continues to increase, and its viscosity also increases, and finally becomes a jelly state The solid precipitated out of the aqueous solution. It is a chelating agent and a lattice distortion agent, which can form stable complexes with metal ions such as calcium and magnesium in water. It also has good dispersing properties and can disperse amorphous particles such as crystalline compounds, soil, dust, corrosive substances and biological debris in water. 

Use

1. Used as scale inhibitor and dispersant in industrial water treatment. Compatibility is good. It can also be used for pre-treatment of drinking water. Used to separate red mud in the preparation of alumina. In the chlor-alkali plant, it is mostly used for the manufacture of cosmetics. It can be used as an ointment to promote the absorption of Griseofulvin, and it can also be used to control the release of drugs. It is used to formulate finishing agents for leather and some high-end commodities, to prepare acrylic resin paints, etc. for fixing chromium salts, assisting tanning, reducing chromium pollution, etc., for improving the processing performance of polyvinyl chloride, as a corrosion inhibitor and scale inhibitor, Water stabilizers, quenchers, thickeners, etc. are used as leather finishing fillers, textile slurries and water quality stabilizers. Used in the manufacture of acrylic resin paints. They can be used as film-forming agents and adhesives in leather finishing agents. It is widely used in the decoration of light leather such as face leather, garment leather, glove leather, etc. for the production of polyacrylic resin latex paint, which can enhance the bending resistance, extensibility, light resistance, aging resistance, cold resistance and heat resistance of the leather. Pigment paste is the main modified film former for modified grain leather.
2. It can be used as an excellent suspending agent, emulsifier, transparent matrix for advanced cosmetics and drug auxiliary material matrix. It is also the most effective water-soluble thickener. It is also used in toothpaste as a thickening agent and binder. Use in combination.
3. It is a commonly used dispersant, which can disperse microcrystals or sediments of calcium carbonate, calcium sulfate and other salts in water without precipitation, so as to achieve the purpose of scale inhibition. In addition to being used as a scale inhibitor and dispersant in circulating cooling water systems, it is also widely used in papermaking, textiles, printing and dyeing, ceramics, coatings and other industries.
4. It is used in water treatment of chemical industry, fertilizer, printing and dyeing, power generation, etc.

It is used to prevent scaling in circulating cooling water systems such as power plants, steel plants, chemical plants, fertilizer plants, oil refineries and air conditioning systems.

Production method

It is obtained by polymerizing acrylic acid as a monomer in the presence of an initiator

The production method of acrylic acid
a. Cyanoethanol method Using chloroethanol as raw material, and sodium cyanide melon to obtain cyanoethanol. In the presence of sulfuric acid, cyanohydrin is hydrolyzed at 175°C to obtain acrylic acid.
b. Acrylonitrile hydrolysis method Using acrylonitrile as raw material in the presence of sulfuric acid to generate sulfate of acrylamide, and then hydrolyzed to obtain acrylic acid.
c. Repe method and modified Repe method Dissolve acetylene in tetrahydrofuran and add it to the reaction kettle after metering. In the presence of a catalyst composed of nickel bromide and copper bromide, carbon monoxide and water are passed through, and the reaction is carried out at 200 to 225 ° C and 7.8 to 9.8 MPa.
d. Acrolein oxidation method Mix propylene, air, and water in a ratio of 1:10:6 (V), and then pass into the first fluidized bed, where the catalysts of aluminum, vanadium, phosphorus, iron, aluminum, nickel, and potassium are catalyzed. At 370 ~ 390 ℃ for 5.5s, the line speed is 0.6m/s. Then enter the second fluidized bed, stay for 2.25s under the catalysis of aluminum-vanadium=tungsten, and control the reaction temperature at 270-300°C. The space-time yield of acrylic acid is 55-60 kg/m·h. This method is safe, light in pollution and low in cost. It is the main method for domestic and foreign production.
Preparation of polyacrylic acid Add deionized water into the polymerization kettle, heat at 60-100℃, and start to drop the mixed solution of ammonium persulfate and acrylic acid (prepared with deionized water). After dripping, continue to keep stirring for 3 to 4 hours. product. Add 530kg of deionized water to the polymerization kettle, add 41kg of peregal OS-15 and stir to dissolve. Then 4kg of sodium lauryl sulfate was added, and after stirring and dissolving, 68kg of mixed monomers (butyl acrylate, acrylonitrile) were added within 20min. After stirring for 15 minutes, add 30 kg of 1.5% ammonium persulfate aqueous solution, and finish adding within 30 minutes. After continuing to stir for 15 min, the temperature was slowly raised to 70 °C, and the mixed monomer (272 kg) was added dropwise, and the drop was completed in about 1 h. After the addition, the mixture was stirred at 80°C for 1 h.
After the reaction is completed, the temperature is lowered to about 40 ° C, 70 kg of OS-15 is added, and after stirring for 15 minutes, the product is filtered to remove impurities to obtain the product.
e. Using solution polymerization method, acrylic acid is used as raw material, diluted with water, and polymerized under the action of initiator. Acrylic acid polymerization is fast and exothermic. In order to control the polymerization process, in the production of polyacrylic acid used for circulating water treatment, acrylic acid is usually prepared into an aqueous solution of less than 40% for polymerization, and the polymerization temperature is usually controlled at 50 ~ 150 ℃ . Commonly used initiators are ammonium persulfate and sodium sulfite, which are often used in the polymerization process.
Add a small amount (<5%) of mercaptosuccinic acid, isopropanol, etc. as polymerization retarder, and hydroquinone or catechol are used as polymerization inhibitor. A certain stoichiometric amount of deionized water was added to the reactor equipped with an electric stirrer, a reflux condenser, a dropping funnel and a thermometer, and the stirring was started and the reaction temperature was raised to about 80°C. Alcohol is added to the reactor to be miscible with water. A stoichiometric amount of ammonium persulfate is prepared into a dilute solution with a metered amount of water, placed in the dropping funnel on the polymerization reactor, the metered amount of acrylic acid (AA) monomer is mixed with a certain amount of water, and placed in the polymerization reactor. in another dropping funnel. When the temperature of the water in the reactor reaches the temperature required for the reaction, the aqueous acrylic acid monomer solution and the aqueous initiator ammonium persulfate solution are added dropwise, and the rate of addition is controlled to make the reaction temperature between 85 and 90°C, and the polymerization is carried out for 3 to 5 hours. After the reaction is completed, the polymer solution is cooled to room temperature, and samples are taken to analyze various technical indicators.

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