Molecular Formula | [C6H7O2(OH)3-m(OOCCH3)m],m=0~3 |
Molar Mass | 59.0437 |
Density | 1.3 g/mL at 25 °C (lit.) |
Melting Point | 230-300℃ |
Boling Point | 210 °C |
Solubility | The solubility of cellulose acetate is greatly influenced by the level of acetyl groups present. In general, cellulose acetates are soluble in acetone–water blends of varying ratios, dichloromethane– ethanol blends, dimethyl formamide, and dioxane. |
Appearance | Colorless solid |
Specific Gravity | 1.3 |
Color | White |
Merck | 13,1978 |
Storage Condition | 2-8°C |
Stability | Stable. Combustible. Incompatible with strong oxidizing agents. |
Refractive Index | n20/D 1.475(lit.) |
MDL | MFCD00081496 |
Safety Description | S24/25 - Avoid contact with skin and eyes. |
WGK Germany | - |
HS Code | 39121100 |
Reference Show more | 1. Ren Wendong, Xing Jianguo, Wang Xinchun, et al. Preparation of total flavonoids osmotic pump tablets of vanilloid and its influencing factors on drug release in vitro [J]. Chinese Journal of Experimental prescriptions, 2011, 26 (06):23-26. 2. Zhang, Xianfeng, et al. "Facile synthesis of blue fluorescent carbon nanodots based on the pyroosis of straw for iron (III) detection and cellular imaging." International Journal of Environmental Analytical Chemistry (2020): 1-16.https:// doi.org/10.1080/0 3. Zhang, Xianfeng, et al. "Facile heat reflux synthesis of blue luminescent carbon dots as optical nanoprobes for cellular imaging." New Journal of Chemistry 41.2 (2017): 702-708.https://doi.org/10.1039/C6NJ02702D |
cellulose acetate is a white, odorless, tasteless, non-toxic granular, powdery or fibrous solid. The melt has good fluidity, is easy to form and process, and the molded product has the advantages of toughness, transparency and good gloss. The properties of the molded article were as follows: Tensile strength 13-61MPA; Impact strength (cantilever beam method) 21.4-287J/m2; Heat distortion temperature (under a stress of 453kPa) 43-98 ° C.; And volume resistivity l013 Q-cm. Self-extinguishing plastics can be prepared by adding flame retardants. Triacetate fiber is stronger than diacetate fiber, the tensile strength is almost twice as large, the compression strength is also large, and the heat resistance is also high, so it is suitable for the manufacture of film film and other photosensitive substrates. Diacetic acid fiber is soluble in concentrated hydrochloric acid and acetone, while triacetic acid fiber is insoluble, only soluble in dichloromethane and chloroform, but cellulose acetate is insoluble in dichloromethane and chloroform.
cellulose acetate is a general name, it includes all varieties of esterification degree between 1~3, when the cellulose with acetic anhydride treatment, will produce cellulose acetate, cellulose acetate. The above reaction produces cellulose triacetate, I .e., a glucose core with three hydroxyl groups esterified, or degree of esterification of 3.0. Because cellulose triacetate is insoluble in many solvents and lacks plasticity, in order to expand its use, it must be hydrolyzed into products such as cellulose acetate with a degree of esterification between 2 and 3, can be dissolved in acetone. After hydrolysis, various degrees of esterification of cellulose acetate can be produced. The degree of esterification is generally expressed as the content of acetyl (CH3 -CO) or acetic acid (CH3 -COOH).
This product is partially or completely acetylated cellulose. The content of acetyl groups (C2H30) shall be 9.0% to 44.8% calculated on the dried product and shall be 90.0% to 110.0% of the label weight.
cellulose acetate fiber is one of the most widely used cellulose plastics. According to different requirements, you can choose different formulations of cellulose acetate and additives. In the car, aircraft, construction, machinery, tools, office and drawing supplies, electrical components, packaging materials, household supplies, cosmetics, appliances, photography, printing, film and other fields are widely used. Cellulose Triacetate is suitable for use as film base, X-ray film base, insulation film, isolation film, flat wire insulation of high voltage motor, etc. Cellulose diacetate can be used as recording tape, seawater desalination membrane, water purification filter membrane, through the chemical fiber spinning process can be used as cigarette filter and textile materials. Cellulose acetate plastic can also be used as a tool handle, bicycle handle, pen Rod, glasses frame and oil, benzene and other containers, thermal insulation materials, plates, tubes, rods and other profiles of packaging films.
take an appropriate amount of this product and dissolve it in dioxane, take 1 drop on the potassium bromide wafer, dry it at 105°C for 1 hour, and then measure it. The infrared absorption spectrum should be consistent with that of the reference substance (General rule 0402)..
This product is non-toxic. The finished product is packaged in Kraft three-in-one composite bags, lined with polyethylene film, each 25kg, or packaged according to user needs. Storage should be placed in a dry, ventilated, clean warehouse, away from heat sources, to avoid direct sunlight. Transportation should be avoided in the sun and rain.
Take 10g of this product, weigh it accurately, shake it and dissolve it in 100ml of mixed solution of methanol-dichloromethane (50: 50), with a suitable single-column rotational viscometer (Brookfield type LV model or efficacy equivalent viscosity
The viscosity shall be 0.1~0633 of the indicated viscosity when measured according to law at 60 revolutions per minute of No. 2 rotor at 20°C ± 75% °C (General rule 140% second method).
Take 5.0g of this product, weigh it accurately, add 150ml of New boiling cold water, shake it, and place it for 3 hours. Filtering, filter residue is washed with ice, combined filtrate and washing liquid, phenolphthalein indicator solution 2~3 drops, with sodium hydroxide titration solution (0.01mol/L) titration to pink. Each 1 ml of sodium hydroxide titration solution (0.01 mol/L) corresponds to 0. 6005mg of free acid. Calculated as the dried product, the free acid content shall not exceed 0.1%.
take this product about O.lg, precision weighing, in the top empty bottle, Precision Add 5ml water, add anhydrous sodium sulfate l.Og, sealed, as a test solution; Another dichloromethane, chloroform, 1, 1, 2-trichloroethylene and dioxane, precision weighing, dissolved and diluted with water to make each lml containing dichloromethane, chloroform, 1, 1, 2-trichloroethylene and dioxane are mixed solutions of 12ug, 1.2ug, 1.6ug and 7.6ug respectively. 5ml was accurately measured, placed in a top empty bottle, added with anhydrous sodium sulfate l.Og, sealed, and used as a reference solution. According to the test for determination of residual solvents (General rule 0861, Method 1), the capillary column with (5%) phenyl-(95%) methylpolysiloxane as stationary liquid was used as the column; The column temperature was 35°C; the inlet temperature was 100°C, the detector temperature was 260°C; The headspace bottle equilibrium temperature was 80°C, the equilibrium time was 60 minutes, and the injection volume was 1.0ml. The separation degree between peaks of each component shall meet the requirements when the reference solution is injected in the headspace. The sample solution and the reference solution shall be accurately measured, and the sample shall be injected in the headspace respectively. The chromatogram shall be recorded and calculated by the peak area according to the external standard method.
take this product, dry at 105°C for 3 hours, loss of weight shall not exceed 5.0% (General rule 0831).
take 0841g of this product and check it according to law (General rule 0.1%). The remaining residue shall not exceed.
The residue left under the item of taking the ignition residue shall not contain more than 10 parts per million of heavy metal when examined by law (General Principles 0821, Law II).
when making films, sheets, coatings and fibers with cellulose acetate, the cellulose acetate resin is dissolved in a solvent to prepare a 10% ~ 25% solution, which is filtered and then coated, cast, spinning and other means of processing into a variety of products. In addition to spinning processing fiber, also need to add a certain amount of plasticizer (such as dimethyl phthalate, Diethyl ester, etc.). The thermoplastic pipes, plates, rods and other products can be obtained by mixing cellulose acetate and plasticizer at a certain temperature and then granulating and molding, and then extruding or injection molding. The injection molding temperature was 177~255 ℃, and the molding pressure was 58.8 ~ 196MPa. Cellulose Triacetate with an acetic acid content of 60% -62. 5% is usually used to make films and films.
take about 2.0g of this product, accurately weigh it, put it in an Erlenmeyer flask, add 100ml of acetone and 10ml of water, close the plug, stir with a magnetic stirrer until it is completely dissolved, precision Add human sodium hydroxide titration solution (1.0mol/L)30ml, continue to stir for 30 minutes, heat water 100ml, rinse the inner wall of the Erlenmeyer flask, continue to stir for 2 minutes, cool, add 2-3 drops of phenolphthalein indicator solution, titrate with sulfuric acid titration solution (0.5mol/L) to the end point, and correct the titration result with blank test. Each 1 ml of sulfuric acid titration solution (0.5mol/L) is equivalent to 43.05mg of C2H3O.
take about 2.0g of this product, accurately weigh it, put it in an Erlenmeyer flask, Add 30ml of dimethyl sulfoxide and ML of acetone, close the plug, and stir with a magnetic stirrer for 16 hours, precision Add human sodium hydroxide titration solution (1.0mol/L)30ml, continue to stir for 6 minutes, stand for 60 minutes, heat water 100ml, rinse the inner wall of the Erlenmeyer flask, continue to stir for 2 minutes, cool, add 4-5 drops of phenolphthalein indicator solution, titrate with hydrochloric acid titration solution (0.5mol/L) to the end point, add excess hydrochloric acid titration solution (0.5mol/L)0.5, the mixture was stirred for 5 minutes, allowed to stand for 30 minutes, titrated to pink with sodium hydroxide titration solution (0.5mol/L), and the titration result was corrected by a blank test. Per l of hydrochloric acid titrant (0.5mol/l) corresponds to 21.525mg of C2H3O.
pharmaceutical excipients, release blockers and coating materials.
sealed storage.
viscosity is indicated in units of mPa · s or Pa · S.
EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
Introduction | cellulose acetate is a white solid, due to the different methods of manufacturing and sedimentation , the appearance and shape are also different. Commercially available goods are white small flake, often with dust powder, high grade is white fine particle dust-free powder. Its application is extremely wide, such as as film base, film diaphragm or optical fiber, etc. |
preparation | cellulose acetate is the esterification of cotton fiber or wood fiber with acetic acid or acetic anhydride under the action of catalyst, and a thermoplastic resin was obtained. |
Use | for the preparation of cellulose acetate fiber plastic, cellulose acetate filter membrane, etc. for the preparation of pharmaceutical enteric coating, cellulose acetate filter membrane |
production method | 1. After drying the refined short cotton wool, it is activated by acetic acid, and then in the presence of acetic acid catalyst, it is esterified with acetic acid and acetic anhydride mixture, and then hydrolyzed with dilute acetic acid. Neutralization of the catalyst, so that the product deep precipitation, after acid precipitation, refining, drying available. 2. After drying the refined short cotton wool, it is activated by acetic acid, and then in the presence of sulfuric acid catalyst, esterification reaction is carried out with acetic acid and acetic anhydride mixture 7 times of the refined short cotton wool to make it acetic acid, dilute acetic acid was then added to hydrolyze to the desired degree of hydrolysis (1.72-1.95). The catalyst is neutralized to precipitate the product, and after deacidification, washing, refining and drying, a cellulose acetate is obtained. Cellulose diacetate and cellulose triacetate can be obtained by varying the amount of the mixed solution of acetic acid and acetic anhydride added during the acetylation reaction. The amount of the mixed solution of acetic acid and acetic anhydride was 8.5 times that of the refined short cotton wool, and the reaction mixture was hydrolyzed with dilute acetic acid to reach a degree of substitution of 2.28 to 2.49 to obtain cellulose diacetate. The amount of the mixed solution of acetic acid and acetic anhydride was 10 times that of the refined short cotton wool, and the reaction mixture was hydrolyzed with dilute acetic acid to reach a degree of substitution of 2.8-2.9 to obtain cellulose triacetate. |
toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |