Building grade MHEC
Building grade MHEC Methyl Hydroxyethyl Cellulose is an odorless, tasteless, non-toxic white powder that can be dissolved in cold water to form a transparent viscous solution. It has the characteristics of thickening, bonding, dispersion, emulsification, film formation, suspension, adsorption, gelation, surface activity, moisture retention and protective colloid. Since the aqueous solution has surface active function, it can be used as a colloidal protective agent, emulsifier and dispersant. Building grade MHEC methyl Hydroxyethylcellulose aqueous solution has good hydrophilicity and is an efficient water retaining agent. Hydroxyethyl methyl cellulose contains hydroxyethyl groups, so it has good anti-mold ability, good viscosity stability and anti-mildew during long-term storage.
Physical and chemical properties:
Appearance: MHEC is white or almost white fibrous or granular powder; odorless.
Solubility: MHEC can dissolve in cold water and hot water, L model can only dissolve in cold water, MHEC is insoluble in most organic solvents. After surface treatment, MHEC disperses in cold water without agglomeration, and dissolves slowly, but it can be quickly dissolved by adjusting its PH value of 8~10.
PH stability: The viscosity changes little within the range of 2~12, and the viscosity decreases beyond this range.
Granularity: 40 mesh pass rate ≥99% 80 mesh pass rate 100%.
Apparent density: 0.30-0.60g/cm3.
Products Grades
| Methyl Hydroxyethyl Cellulose grade | Viscosity
(NDJ, mPa.s, 2%) |
Viscosity
(Brookfield, mPa.s, 2%) |
| MHEC MH60M | 48000-72000 | 24000-36000 |
| MHEC MH100M | 80000-120000 | 40000-55000 |
| MHEC MH150M | 120000-180000 | 55000-65000 |
| MHEC MH200M | 160000-240000 | Min70000 |
| MHEC MH60MS | 48000-72000 | 24000-36000 |
| MHEC MH100MS | 80000-120000 | 40000-55000 |
| MHEC MH150MS | 120000-180000 | 55000-65000 |
| MHEC MH200MS | 160000-240000 | Min70000 |
Building grade MHEC methyl Hydroxyethyl cellulose can be used as a protective colloid, emulsifier and dispersant due to its surface active function in its aqueous solution. Examples of its applications are as follows:
How to produce Building grade MHEC？
The production method of Building grade MHEC methyl hydroxyethyl cellulose is that refined cotton is used as a raw material and ethylene oxide is used as an etherifying agent to prepare Building grade MHEC. The raw materials for preparing Building grade MHEC are prepared in parts by weight: 700-800 parts of toluene and isopropanol mixture as solvent, 30-40 parts of water, 70-80 parts of sodium hydroxide, 80-85 parts of refined cotton, ring 20-28 parts of oxyethane, 80-90 parts of methyl chloride, 16-19 parts of glacial acetic acid; the specific steps are as follows:
In the first step, add a mixture of toluene and isopropanol, water, and sodium hydroxide into the reaction kettle, raise the temperature to 60-80°C, and keep it for 20-40 minutes;
The second step, alkalization: cool the above materials to 30-50°C, add refined cotton, spray with a mixture of toluene and isopropanol, evacuate to 0.006Mpa, fill with nitrogen for 3 replacements, and perform alkalis after replacement The alkalization conditions are as follows: alkalization time is 2 hours, and alkalization temperature is 30℃-50℃;
The third step, etherification: after alkalization, the reactor is evacuated to 0.05～0.07MPa, ethylene oxide and methyl chloride are added and kept for 30～50 minutes; the first stage of etherification: 40～60℃, 1.0～2.0 Hours, the pressure is controlled between 0.15-0.3Mpa; the second stage of etherification: 60～90℃, 2.0～2.5 hours, the pressure is controlled between 0.4-0.8Mpa;
The fourth step, neutralization: add the metered glacial acetic acid in advance to the desolventizer, press into the etherified material for neutralization, increase the temperature to 75～80℃ for desolventization, the temperature will rise to 102℃, and the pH value will be 68. When the desolvation is completed; fill the desolvation kettle with tap water treated by the reverse osmosis device at 90℃～100℃;
The fifth step, centrifugal washing: the materials in the fourth step are centrifuged by a horizontal screw centrifuge, and the separated materials are transferred to a washing kettle filled with hot water in advance for washing of the materials;
The sixth step, centrifugal drying: the washed materials are transported into the dryer through a horizontal screw centrifuge, the materials are dried at 150-170°C, and the dried materials are crushed and packaged.
Compared with the existing cellulose ether production technology, the present production method uses ethylene oxide as the etherifying agent to prepare Building grade MHEC methyl hydroxyethyl cellulose, and because it contains hydroxyethyl groups, it has good antifungal ability. Good viscosity stability and mildew resistance during long-term storage. It can replace other cellulose ethers.
Building grade MHEC is cellulose ether derivatives, Cellulose ether is a polymer fine chemical material with a wide range of uses made from natural polymer cellulose through chemical treatment. Since cellulose nitrate and cellulose acetate were made in the 19th century, chemists have developed many series of cellulose derivatives of cellulose ethers. New application fields are constantly being discovered and many industrial sectors are involved. Cellulose ether products such as sodium carboxymethyl cellulose (CMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC) And methyl hydroxypropyl cellulose (MHPC) and other cellulose ethers are known as “industrial monosodium glutamate” and building grade MHEC have been widely used in tile adhesive,dry mortar, cement and gypsum plasters etc.
Packaging:
25kg paper bags inner with PE bags.
20’FCL: 12Ton with palletized, 13.5Ton without palletized.
40’FCL: 24Ton with palletized, 28Ton without palletized.