Carbomer powder Raw Materials CAS 9007-20-9

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Uses and synthesis of Carbomer powder

Carbomer powder, abbreviated as PAA, also known as 2-acrylic acid homopolymer, acrylic resin coating, acrylic resin, acrylic monomer polymer, acrylic modified resin, acrylic resin emulsion, Carbomer CAS 9007-20-9 is a water-soluble acrylic acid polymer, Carbomer Raw Materials is also soluble in some polar solvents such as methanol and ethylene glycol. Carbomer Raw Materials is also soluble in certain polar solvents such as methanol, di- alkanes and ethylene glycol. The ionization constant is 4.75.

Because of the large number of carboxyl groups in the molecule, Carbomer CAS 9007-20-9 can be reacted with alkali, alcohol, amine, and can also be dehydrated, degraded and complexed.

Carbomer powder can be used as thickener, dispersant, flocculant, adhesive and film-forming agent, etc. It is widely used in coating, plastics, papermaking, textile, rubber, food, medicine, cosmetics and water treatment industries.

Applications / Functions of Carbomer powder

Carbomer Raw Materials are used to prevent scaling in circulating cooling water systems in power plants, steel mills, chemical plants, fertilizer plants, oil refineries and air conditioning systems.

Physicochemical Property of Carbomer powder

Low molecular weight Carbomer powder is a colorless and transparent solid. Its 20%-30% aqueous solution is light yellow or colorless viscous liquid. Its molecular weight is 500~5000, and its 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 much larger than the first dissociation constant of carbonic acid.

Therefore, Carbomer CAS 9007-20-9 is a weaker acid than carbonic acid. It is generally stable to strong acids, bases, and oxidizing agents. However, at high temperatures or under prolonged exposure to light, low molecular weight Carbomer Raw Materials will still re-polymerize, causing its molecular weight to continue to increase, and its viscosity to increase, and it will eventually become a solid in a jelly state that precipitates out of the aqueous solution.

Carbomer Raw Materials is a kind of chelating agent and 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.

Production methodprocess of Carbomer powder

Carbomer powder is produced by polymerizing acrylic acid as a monomer in the presence of an initiator.

Production method of acrylic acid

• a. Cyanoethanol method Chloroethanol is used as raw material, and sodium cyanide is melted to obtain cyanoethanol. Cyanoethanol is hydrolyzed at 175°C in the presence of sulfuric acid to obtain Carbomer CAS 9007-20-9.
• b. Acrylonitrile hydrolysis method Take acrylonitrile as raw material and hydrolyze it in the presence of sulfuric acid to produce sulfate of acrylamide, and then hydrolyze it to get acrylic acid.
• c.Reppe's method and modified Reppe's method Acetylene is dissolved in tetrahydrofuran, measured and added to the reactor. Carbon monoxide and water are passed in the presence of a catalyst consisting of nickel bromide and copper bromide, and the reaction is carried out at 200 to 225°C and 7.8 to 9.8 MPa.
• d. Acrolein oxidation was carried out by mixing propylene, air, and water in the ratio of 1:10:6 (V), and then passed into the first boiling bed, which was catalyzed by aluminum, vanadium, phosphorus, iron, aluminum, nickel, and potassium to stay at 370-390°C for 5.5 s, with a linear velocity of 0.6 m/s. Then it was passed into the second boiling bed, which was catalyzed by aluminum-vanadium=tungsten to stay at 2.25 s, with the reaction The temperature is controlled at 270～300°C. The null time yield of Carbomer Raw Materials is 55～60kg/m-h. This method is safe, light pollution, low cost, and is the main method for domestic and foreign production.

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