Hydroxyethyl Methyl Cellulose (HEMC)
MELLUTEL hydroxyethyl methyl cellulose (HEMC) is a non-ionic cellulose ether polymer based on cellulose, a natural polymer derived from refine cotton linter.
The degree of substitution and modification of substituent, allows the different chemical properties and benefits after alkalization and etherification reactions with Sodium hydroxide,Cholromethane,and ethylene oxide.
HEMC is better performance in terms of higher gel temperature and hydrophilicity rely on ethyl substituent groups.
•Consistency development: very fast
•Final consistency: high
•Sag resistance: moderate
•Water demand: moderate
•Water retention: very high
•Cement retardation: moderate
•Heat stability: standard
Hydroxyethyl methyl cellulose is a odorless, odorless, non-toxic white powder that can be dissolved in cold water to form a transparent viscous solution.
The degree of substitution and modification of substituent, allows the different chemical properties and benefits after alkalization and etherification reactions with Sodium hydroxide,Cholromethane,and ethylene oxide.
HEMC is better performance in terms of higher gel temperature and hydrophilicity rely on ethyl substituent groups.
Structural formula
(n～2)/2
OR=-OH、-OCH3、-[OCH2CH(CH3)]nOH or-[OCH2CH(CH3)]OCH3
HEMC Main application
Hydroxyethyl methyl cellulose (HEMC) is a non-ionic cellulose mixed ether made from cotton and wood through alkalization, ethylene oxide and methyl chloride etherification. HEMC is widely used in water-based latex coatings, construction and building materials, printing ink, oil drilling and other fields. Its properties are similar to HPMC, but the presence of hydroxyethyl makes HEMC more soluble in water, the solution is more compatible with salt, and has a higher condensation temperature.
1. in the pharmaceutical field, hydrophilic gel framework materials and pharmaceutical excipients for the preparation of sustained-release preparations are widely used, including oral tablets, suspensions, local preparations, porogens and coating agents.
2. in the field of food processing, it is used for bonding, emulsification, film-forming, thickening, suspension aid, dispersion, water retaining agent, etc.
3. in the field of daily chemical industry, it is used as an additive for toothpaste, cosmetics, detergent, etc.
4. in the field of building materials, it is used as a gelling agent and water retaining agent for cement, gypsum and lime, and is an excellent admixture for powder building materials.
Specification
Type Item | HEMC |
Viscosity mPa.s | 4000,6000,7000, 8000,10000, 20000, 30000, 40000, 60000, 70000, 100000, 150000, 200000 |
Gel temperature ℃ | 70.0-90.0 |
pH | 5.0-9.0 |
Loss on drying % | ≤5.0 |
Burning residue % | ≤5.0 |
Bulk density g/L | 350～420 |
Methoxy % | 19.0～24.0 |
Hydroxyethoxy % | 7.0～10.0 |
HEMC packaging and storage
Barrel or paper plastic bag lined with polyethylene film inner bag.
Net weight of each bag: 25kg.
Protect from sun and rain during storage and transportation.
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