CARBOMER 672
Carbomer 934
CAS: 9007-20-9
Molecular Formula: C15H17ClO3
CARBOMER 672 - Names and Identifiers
CARBOMER 672 - Physico-chemical Properties
| Molecular Formula | C15H17ClO3 |
| Molar Mass | 280.74668 |
| Density | 1.2g/mLat 25°C |
| Boling Point | 116°C |
| Appearance | White loose powder, characteristic slightly smelly, hygroscopic |
| Storage Condition | Room Temprature |
| Refractive Index | n20/D 1.442 |
| Physical and Chemical Properties | Low molecular weight polyacrylic acid is a colorless and transparent solid. Its 20% ~ 30% aqueous solution is light yellow or colorless viscous liquid. The molecular weight is 500~5000 and the pH value is 2~4. Its dissociation constant is approximately 5 × 10-5, which is similar to the dissociation constant of acetic acid (1.8 × 10-5), which is much larger than the first dissociation constant of carbonic acid. Therefore, polyacrylic acid is a weaker acid 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 The solid in the jelly state precipitates from the aqueous solution. It is a chelating agent and a lattice distorting agent, which can form a stable complex with metal ions in water such as calcium and magnesium. It also has good dispersion performance and can disperse amorphous particles such as crystalline compounds, soil, dust, corrosive substances and biological debris in water. |
CARBOMER 672 - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R45 - May cause cancer R46 - May cause heritable genetic damage |
| Safety Description | S53 - Avoid exposure - obtain special instructions before use. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 3265 8/PG 3 |
| WGK Germany | 3 |
| RTECS | AT4680000 |
CARBOMER 672 - Reference
| Reference Show more | 1. [IF=5.875] Peihong Chen et al."Preparation of clarithromycin floating core-shell systems (CSS) using multi-nozzle semi-solid extrusion-based 3D printing."Int J Pharmaceut. 2021 Aug;605:120837 |
CARBOMER 672 - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | polyacrylic acid, PAA for short, alias 2-acrylic homopolymer, acrylic resin coating, acrylic resin, acrylic monomer polymer, acrylic modified resin, acrylic resin emulsion, is a water-soluble acrylic acid polymer, also soluble in some polar solvents, such as methanol, dioxane and ethylene glycol. Ionization Constant 4.75. Because the molecule contains a large number of carboxyl groups, it can react with alkali, alcohol, Amine, dehydration, degradation and complexation reaction. It can be used as thickener, dispersant, flocculant, adhesive and film forming agent, etc. It is widely used in coating, plastic, paper making, textile, rubber, food, medicine, cosmetics and water treatment industries. |
| preparation method | acrylic acid as a monomer is polymerized in the presence of an initiator. preparation of acrylic acid a. Cyanoethanol was obtained from chloroethanol as raw material and sodium cyanide melon. The acrylic acid was obtained by hydrolysis of cyanoethanol in the presence of sulfuric acid at 175 °c. FIG. 1 synthesis of polyacrylic acid by cyanoethanol B. Hydrolysis of acrylonitrile using acrylonitrile as a raw material in the presence of sulfuric acid to hydrolyze the sulfate of acrylamide, and then hydrolyze to obtain acrylic acid. FIG. 2 is the synthesis of polyacrylic acid by hydrolysis of acrylonitrile c. The repe method and the modified repe method dissolve acetylene in Tetrahydrofuran, and add it to the reaction kettle after metering. The reaction is carried out in the presence of a catalyst consisting of nickel bromide and copper bromide at 200 to 225 MPa at 7.8 to 9.8 ° C. With carbon monoxide and water. FIG. 3 shows the synthesis of poly (acrylic acid) by Lei Pei method d. Acrolein oxidation of propylene, air, water in the ratio of 1:10:6 (V) is mixed, and then passed into the first boiling bed, in aluminum, vanadium, phosphorus, iron, aluminum, nickel, potassium-catalyzed residence at 370~390 ℃ 5.5s, linear velocity 0.6 m/s. Then enter the second boiling bed, in the aluminum-vanadium = tungsten catalyst, stay for 2.25s, the reaction temperature is controlled at 270~300. The space-time yield of acrylic acid is 55~60kg/m · h, this method is safe, light pollution, low cost, is the main method of production at home and abroad. FIG. 4 synthesis of polyacrylic acid by oxidation of acrolein preparation of polyacrylic acid deionized water was added into the polymerization kettle and heated at 60~100 ℃, dropwise addition of a mixed solution of ammonium persulfate and acrylic acid (prepared with deionized water) was started. After the completion of the drop, continue to heat and stir 3~4H. Ready product. 530kg of deionized water was added to the polymerization vessel, and 41kg of OS-15 was added and dissolved with stirring. Further, 4kg of sodium dodecyl sulfate was added, and 68kg of mixed monomer (butyl acrylate, acrylonitrile) was added within 20min after stirring and dissolving. After stirring for 15 ml, 30kg of a 1.5% ammonium persulfate aqueous solution was added, and the addition was completed within 30min. After stirring for 15min, the temperature was slowly increased to 70 ° C., and the mixed monomer (272kg) was started to be added dropwise, and the mixture was dropped for about 1H. After the addition, the mixture was stirred at 80 ° C. For 1H. after completion of the reaction, cool down to about 40 ℃, add 70kg of OS-15, stir for 15min, and then filter to remove impurities to obtain product e. Using Solution polymerization method, acrylic acid was 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 preparation of polyacrylic acid for circulating water treatment, acrylic acid is usually polymerized in an aqueous solution of 40% or less, and the polymerization temperature is usually controlled at 50 to 150 °c. Ammonium persulfate and sodium sulfite are commonly used as initiators. In the polymerization process, a small amount (<5%) of mercaptosuccinic acid and isopropanol are often added, and hydroquinone or Catechol is used as a polymerization inhibitor. A certain stoichiometric amount of deionized water is added to the reactor equipped with electric stirrer, reflux condenser, dropping funnel and thermometer, stirring is started and the reaction temperature is raised to about 80 °c, A metered amount of thioglycolic acid or isopropanol was added to the reactor to be miscible with water. The stoichiometric ammonium persulfate is formulated into a dilute solution with metered water, placed in a dropping funnel on the polymerization reactor, and the metered acrylic acid (AA) monomer is mixed with a certain amount of water, it was placed in another dropping funnel on the polymerization reactor. When the water temperature in the reactor reaches the temperature required for the reaction, the acrylic acid monomer aqueous solution and the initiator ammonium persulfate aqueous solution are added dropwise, and the reaction temperature is controlled to be between 85 and 90 degrees C, polymerization reaction 3~5H. After the completion of the reaction, the polymerization solution is cooled to room temperature, sampled and analyzed for various technical indexes, and subpackaged after meeting the requirements. |
| mechanism of action | polyacrylic acid is a commonly used scale inhibitor for industrial circulating cooling water, polyacrylic acid is adsorbed on the micro-grains of the slightly soluble inorganic salt by coordination and chelation, or several micro-grains are connected into a loose particle group with a considerable distance from each other, which hinders the particles from contacting each other and growing up, dispersed in water for a long time. The scale inhibition performance of polyacrylic acid is closely related to molecular weight, and polyacrylic acid with molecular weight of 2000~6000 or 3000~5000 has good scale inhibition effect on calcium carbonate and calcium phosphate scale. |
| Application | 1. Used as Scale Inhibitor and dispersant in industrial water treatment. Good compatibility. Can also be used as pre-treatment of drinking water. Used to separate red mud in the preparation of alumina. In chlor-alkali plant for refined salt water for the manufacture of cosmetics, do ointment can promote the absorption of gray-yellow mold, and can be used for drug release control. Used in the preparation of leather and some high-grade goods finishing agent, the preparation of acrylic resin paint such as for the fixed chromium salt, auxiliary tanning, reduce chromium pollution, etc. used to improve the processing performance of polyvinyl chloride used as corrosion and Scale Inhibitor, water stabilizer, water stabilizer, quenchers, thickeners used as fillers for leather finishing, textile pulp and water quality stabilizers used in the manufacture of acrylic resin paints can be used as a leather finishing agent in the film-forming agent and adhesive, also used in the preparation of polyacrylic resin latex paint widely used in leather, garment leather, glove leather and other light leather decoration, can enhance the leather bending resistance, extensibility, light resistance, aging resistance, cold resistance, heat resistance, is the main modification of pigment paste modified granular leather film forming agent. 2. Can be used as a good suspension agent, emulsifier, high-grade cosmetics transparent matrix and pharmaceutical excipients matrix, but also the most effective water-soluble thickener, also used in toothpaste, as a thickener and adhesive, can be used in combination with other polymers. 3. Is a commonly used dispersant, calcium carbonate, calcium sulfate and other salts of microcrystalline or sediment dispersed in water without precipitation, so as to achieve the purpose of scale inhibition. In addition to the circulating cooling water system as a scale inhibitor and dispersant, but also widely used in paper and textile, printing and dyeing, ceramics, coatings and other industries. 4. Used in chemical, chemical fertilizer, printing and dyeing, power generation and other water treatment. |
| Main reference materials | [1] Editor-in-chief. Dictionary of fine chemicals. Beijing: Chemical Industry Press. 1998. P. 348. [2] Wu Shimin, editor-in-chief of yindelin. Concise Dictionary of fine-grained engineering. SHENYANG: Liaoning Science and Technology Press. 1999. Page 922. |
| purpose | for power plants, steel plants, chemical plants, fertilizer plants, prevention of fouling in recirculating cooling water systems such as refineries and air conditioning systems. |
Last Update：2024-04-09 20:52:54
Supplier List
Spot supply
Product Name: Carbomer 934 Visit Supplier Webpage Request for quotationTel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
Wechat: 18301782025
Spot supply
Product Name: Carbomer 934 Visit Supplier Webpage Request for quotationTel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
Wechat: 18301782025
View History