Methyl cellulose is an ether of cellulose and methanol, a white amorphous powder. It has the formula [C 6 H 7 O 2 (OH) 3-x (OCH 3 ) x ] n . Typical values are x = 1.4–2. It is soluble in cold (up to 50 ℃) water, some organic acids, alcohols and ethers. Insoluble in most organic solvents.
| Cellulose | |
|---|---|
 | |
| Are common | |
| Systematic name | Cellulose Methyl Ester |
| Thermal properties | |
| T. aux. | <0 ° C |
| T. svpl. | 632 ° C |
| Classification | |
| Reg. CAS number | 9004-67-5 |
| PubChem | |
| Reg. EINECS number | |
| Inchi | |
| Codex Alimentarius | |
| Chebi | |
| Security | |
| S-phrases | S24 / 25 |
Content
Getting
Cotton or wood pulp , to increase its reactivity, is treated with an aqueous solution of NaOH , while the cellulose swells and a small amount of its low molecular weight part (1.5-7% of the total mass) passes into the solution. The processing product, called alkaline cellulose, is methylated with chloromethane in an autoclave at a pressure of 1.2–2.0 MPa [1] . The resulting methyl cellulose is washed with hot water, dried and crushed.
Application
Methyl cellulose is used as an adhesive, a thickener for paints and food products (E461), asbestos cement plasticizer , emulsifier and foaming agent.
Also, methyl cellulose is widely used in cinema to create various effects [2] .
See also
- Ethyl cellulose
Notes
- ↑ Chemical Encyclopedia / Editorial board: I. L. Knunyants (Chap. Ed.) Et al. - M .: Big Russian Encycl., 1992. - T. 3. - S. [67] (stb. 126). - 639 p. - 50,000 copies. - ISBN 5-85270-039-8 .
- ↑ Markalova, Nadezhda Drooling Dragon, slime of strangers and chocolate rivers . tvkinoradio.ru (March 6, 2018). Date of treatment March 19, 2018. Archived March 19, 2018.
Literature
- Bratsykhin E.A., Shulgina E.S. Technology of plastic masses: Textbook for technical schools. - 3rd ed., Revised. and additional .. - L .: Chemistry, 1982. - 328 p.