STARCH ACETATE
STARCH ACETATE
CAS: 9045-28-7
Molecular Formula: C29H50O21
STARCH ACETATE - Names and Identifiers
STARCH ACETATE - Physico-chemical Properties
| Molecular Formula | C29H50O21 |
| Molar Mass | 734.6947 |
| Storage Condition | 贮存于阴凉、干燥处，避免日晒、雨淋；有效贮存期12个月。 |
| Physical and Chemical Properties | White powder. It is characterized by low coagulation property of paste, high stability to acid, alkali and heat, high transparency of paste and good freezing stability. It is not easy to form hydrogen bonds between molecules. |
| Use | In the paper industry, it is used for surface gluing, characterized by easy gelatinization, good dispersibility, no clumping, no settling, stable viscosity, strong adhesion, smooth and wear-resistant film formation. |
| Caution | Non toxic, with good biodegradability. Avoid contact with skin and eyes. If accidentally splashed into the eyes, lift the eyelids and rinse with running water or physiological saline. |
STARCH ACETATE - Preparation method
Open Data Verified Data
1. Acetic anhydride method
Add 30%~40% starch lotion into the reactor, use 3% sodium hydroxide aqueous solution under stirring to adjust the starch suspension to pH 11 at 35~40 ℃, then add acetic anhydride to adjust the pH to 7, repeat several times until the acetic anhydride is finished, which takes 1~6h.
2. Ester exchange method
Add starch to the reaction vessel and add water 1.5 times the amount of starch. Stir well to form starch milk. Slowly add a sodium hydroxide solution with a starch content of 3.3% while stirring, so that the pH value of the system is around 10. Then add 3.5% ethylene acetate with starch content and stir for 6 hours at 20-25 ℃. After the ester exchange reaction is completed, neutralize with hydrochloric acid until the pH value is 5, stir for 1 hour, and then adjust the pH value to 7 with alkali. Repeat the process of pressure filtration, water washing, and pressure filtration until there are basically no chloride ions in the water washing solution, and then dry and crush to obtain the product.
Last Update：2023-12-21 11:28:37
STARCH ACETATE - References
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| traits | white powder |
| properties | acetate starch is white powder. It is characterized by low coagulation property of paste, high stability to acid, alkali and heat, high transparency of paste and good freezing stability. It is not easy to form hydrogen bonds between molecules. |
| use | acetate starch is used as thickener, stabilizer, binder and edible starch film. Thickener; Stabilizer; Binder; Preparation of edible starch film. Thickener; Preparation of edible starch film; Stabilizer; Adhesive. Used for instant noodles, minced meat products, soy sauce, canned soup, chocolate and jelly, etc., according to the production needs of appropriate use. mainly used for warp sizing of pure cotton, polyester cotton and synthetic fibers |
| toxicity | ADI does not make special regulations (FAO/WHO,2001). Can be safely used in food (FDA § 172.892;2000). |
| usage limit | except for canned sardines, the rest is the same as "10130, acid treated starch" (FAO/WHO,1994). GB 2760-2001: minced meat products, soy sauce, canned soup, chocolate, instant noodles, jelly, fish balls, all GMP (can be acidified, bleached or enzyme treated at the same time). |
| usage | starch acetate with low degree of substitution contains acetyl 0.5%~ 2.5%, which is used as a thickener in food processing. its advantages are high viscosity, high clarity, weak coagulation and stable storage. It is often compound denatured. Cross-linked starch acetate has higher viscosity stability for high temperature, strong shear force and low pH. Low temperature storage and freeze-thaw stability are also high. It is suitable for canned food applications and can be stored at different temperatures. Hydroxypropyl starch acetate, the degree of substitution of hydroxypropyl is about 3-6, and the degree of substitution of acetyl is about 0.5-0.9. It is a good substrate for chewing gum, insoluble in water, and has good chewing elasticity. |
| production method | starch is esterified with acetic anhydride or vinyl acetate under alkaline conditions. starch is esterified with acetic anhydride or vinyl acetate (≤ 7.5%) under alkaline conditions (the legal number is INS 1420 for the former and 1421 for the latter). |
Last Update：2024-04-09 20:02:46
