Hymetellose
methyl 2-hydroxyethyl cellulose
CAS: 9032-42-2
Molecular Formula: C2H6O2·xCH4O·x
Hymetellose - Names and Identifiers
Hymetellose - Physico-chemical Properties
| Molecular Formula | C2H6O2·xCH4O·x |
| Molar Mass | 269.312 |
| Density | 1.28-1.30 g/cm3 (20℃) |
| Water Solubility | H2O: 20 mg/mL, soluble |
| Solubility | H2O: 20mg/mL, soluble |
| Storage Condition | Store below +30°C. |
| MDL | MFCD00147597 |
| Use | Widely used in water-based latex coatings, construction and building materials, printing inks, oil drilling and other aspects |
Hymetellose - Risk and Safety
| WGK Germany | 1 |
| HS Code | 3912 39 85 |
| Toxicity | LD50 orally in Rabbit: > 2000 mg/kg |
Hymetellose - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | Hydroxyethyl methyl cellulose (MHPC) is an odorless, tasteless, non-toxic white powder, can be dissolved in cold water, forming a transparent viscous solution. With thickening, adhesion, dispersion, emulsification, film formation, suspension, adsorption, gelation, surface activity, moisture retention and protective colloid and other characteristics. Due to the surface active function of aqueous solution, it can be used as colloid protective agent, emulsifier and dispersant. Hydroxyethyl methyl cellulose aqueous solution has good hydrophilicity and is an efficient water-retaining agent. Hydroxyethyl methyl cellulose contains Hydroxyethyl group, so it has good anti-mold ability, long-term storage has good viscosity stability and anti-mildew. |
| preparation | A preparation method of Hydroxyethyl methyl cellulose, which uses refined cotton as a raw material and ethylene oxide as an etherifying agent, preparation of Hydroxyethyl methyl cellulose. The raw material for preparing Hydroxyethyl methyl cellulose is provided with 700-800 parts by weight of a mixture of toluene and isopropanol as a solvent, 30-40 parts by weight of water, 70-80 parts by weight of sodium hydroxide and 80-85 parts by weight of refined cotton, ethylene oxide 20~28 parts, methyl chloride 80~90 parts, glacial acetic acid 16~19 parts; Specific steps are: the first step, in the reactor, add toluene and isopropanol mixture, water, and sodium hydroxide, the temperature is raised to 60~80 ℃, and the temperature is kept for 20~40 minutes; The second step is alkalization: The above materials are cooled to 30~50 ℃, refined cotton is added, and the solvent of toluene and isopropanol mixture is sprayed, vacuum to 0.006Mpa, nitrogen replacement for 3 times, after replacement, alkalization, alkalization conditions: alkalization time is 2 hours, alkalization temperature is 30 ℃ 50 ℃; The third step, etherification: after alkalization, the reactor is evacuated to 0.05~0.07MPa, and ethylene oxide and methyl chloride are added for 30~50 minutes. The first stage of etherification: 40~60 ℃, 1.0~2.0 hours, the pressure is controlled between 0.150.3Mpa; The second stage of etherification: 60~90 ℃, 2.0~2.5 hours, the pressure is controlled between 0.40.8Mpa; The fourth step, neutralization: add the measured glacial acetic acid in the desolvation kettle in advance, press into the etherified material for neutralization, raise the temperature to 75~80 ℃ for desolvation, and raise the temperature to 102 ℃, when the pH value is 68, the desolvation is completed; The desolvation kettle is filled with 90 ℃ ~ 100 ℃ tap water treated by reverse osmosis device; Step 5, centrifugal washing: the materials in the fourth step are centrifuged and separated by a horizontal screw centrifuge, and the separated materials are transferred to a washing kettle filled with hot water in advance to wash the materials. In the sixth step, the materials are centrifuged and dried: the washed material was transported into a dryer by a horizontal screw centrifuge, and the material was dried at 150 to 170 ° C., and the dried material was crushed and packaged. Compared with the existing cellulose ether production technology, the invention uses ethylene oxide as the etherifying agent to prepare Hydroxyethyl methyl cellulose, and has good mold resistance due to containing hydroxyethyl groups, good viscosity stability and resistance to mildew during long-term storage. It may be used in place of other cellulose ethers. |
| Hydroxyethyl methylcellulose | Hydroxyethyl methylcellulose (HEMC) is similar to Hydroxyethyl Cellulose (HEC) and resistant to most salts. The presence of methyl groups results in surface activity on the intermediates methyl cellulose and Hydroxyethyl Cellulose. HEMC, like HEC, has no thermal gel properties in boiling water. The commercial products have a degree of substitution ranging from 1.8 to 3.0 for hydroxyethoxy MS and from 0.8 to 1.2 for methoxy DS. The decomposition started at 260 ° C. And the weight volume was 0.743/g. The manufacturing process of HEMC is described in U.S. Patent Nos. 3709876 and 3903076. Hydroxyethyl methyl cellulose can be used as an additive in cosmetics for daily use, and can also be used in latex coatings and formulation components with high resistance to enzymatic chemical attack that need to be stored for a long period of time. Intermediate surface-active properties may also be useful in the polymerization of vinyl acetate. |
| Use | widely used in water-based latex coatings, construction and building materials, printing inks, oil drilling and other aspects |
| spontaneous combustion temperature | >360°C |
Last Update：2024-04-09 15:16:53
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