Ethyl cellulose Chemische Eigenschaften,Einsatz,Produktion Methoden
R-S?tze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-S?tze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Chemische Eigenschaften
white to slightly yellowish powder
Chemische Eigenschaften
Ethyl celluloses are low density polymers (1070–1180 kg.m–3) with solubilities depending on the degree of ethylation; usually commercial grade contains 44–48% ethoxyl functional groups. Solid masses of ethylcellulose exhibit low absorption of moisture, excellent dimensional stability and low temperature toughness and impact resistance. Chemically they are less resistant towards acids than cellulose esters but much more resistant to alkalis. They can be processed by injection molding. Because ethylcellulose is soluble in a wide variety of solvents, it provides a wide variety of varnish formulations. Benzylcelluloses yield plastics with excellent dielectric properties and chemical stability.
Verwenden
ethyl cellulose is a binder, film former, and thickener. It is used in suntan gels, creams, and lotions. This is the ethyl ether of cellulose.
synthetische
Ethyl cellulose is prepared by reacting cellulose with caustic to form caustic cellulose, which is then reacted with chloroethane to form ethyl cellulose. Plasticgrade material contains 44-48% ethoxyl.
Although not as resistant as cellulose esters to acids, it is much more resistant to bases. An outstanding feature is its toughness at low temperatures.
Vorbereitung Methode
Ethylcellulose is prepared by treating purified cellulose (sourced
from chemical-grade cotton linters and wood pulp) with an alkaline
solution, followed by ethylation of the alkali cellulose with
chloroethane as shown below, where R represents the cellulose
radical:
RONa + C2H5Cl→ROC2H5+NaCl
The manner in which the ethyl group is added to cellulose can be
described by the degree of substitution (DS). The DS designates the
average number of hydroxyl positions on the anhydroglucose unit
that have been reacted with ethyl chloride. Since each anhydroglucose
unit of the cellulose molecule has three hydroxyl groups, the
maximum value for DS is three.
Sicherheitsprofil
Low toxicity by
ingestion and skin contact. A skin irritant.
When heated to decomposition it emits
acrid smoke and irritating fumes
Sicherheit(Safety)
Ethylcellulose is widely used in oral and topical pharmaceutical
formulations. It is also used in food products. Ethylcellulose is not
metabolized following oral consumption and is therefore a
noncalorific substance. Because ethylcellulose is not metabolized it
is not recommended for parenteral products; parenteral use may be
harmful to the kidneys.
Ethylcellulose is generally regarded as a nontoxic, nonallergenic,
and nonirritating material.
As ethylcellulose is not considered to be a health hazard, the
WHO has not specified an acceptable daily intake. The highest
reported level used in an oral product is 308.8 mg in an oral
sustained release tablet.
LD50 (rabbit, skin): >5 g/kg
LD50 (rat, oral): >5 g/kg
Lager
Ethylcellulose is a stable, slightly hygroscopic material. It is
chemically resistant to alkalis, both dilute and concentrated, and
to salt solutions, although it is more sensitive to acidic materials
than are cellulose esters.
Ethylcellulose is subject to oxidative degradation in the presence
of sunlight or UV light at elevated temperatures. This may be
prevented by the use of antioxidant and chemical additives that
absorb light in the 230–340nm range.
Ethylcellulose should be stored at a temperature not exceeding
32°C (90°F) in a dry area away from all sources of heat. It should
not be stored next to peroxides or other oxidizing agents.
Inkompatibilit?ten
Incompatible with paraffin wax and microcrystalline wax.
Regulatory Status
GRAS listed. Accepted for use as a food additive in Europe.
Included in the FDA Inactive Ingredients Database (oral capsules,
suspensions and tablets; topical emulsions and vaginal preparations).
Included in nonparenteral medicines licensed in Europe.
Included in the Canadian List of Acceptable Non-medicinal
Ingredients.
Ethyl cellulose Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
