Дипропіленгліколь

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Дипропіленгліколь як парфумерна сировина
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Визначення

Dipropylene glycol is a mixture of three isomeric chemical compounds. It is a colorless, nearly odorless liquid.

БЕЗ ЗАПАХУ
DPG
Type
Складник
Olfactive family
Амброві й мускусні
Source
Made from propylene oxide
Chemical class
glycol ether
Інструменти
Піраміда
ВВерхні ноти
СНоти серця
ББазові ноти

Запах

Dipropylene glycol is nearly odorless. Reference descriptions of the pure liquid call it odorless. A producer describes its odour as low.

Докладно

Dipropylene glycol (DPG) has the formula C₆H₁₄O₃ and the CAS number 25265-71-8. It is a chemical substance made up of two linked propylene glycol units. It is a mixture of three isomeric chemical compounds, 4-oxa-2,6-heptandiol, 2-(2-hydroxy-propoxy)-propan-1-ol, and 2-(2-hydroxy-1-methyl-ethoxy)-propan-1-ol. It has a high boiling point and low toxicity. It is miscible with water and soluble in ethanol.

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Uses

Dipropylene glycol is used as a plasticizer, an intermediate in industrial chemical reactions, a polymerization initiator or monomer, and a solvent. It is also used in detergent formulations and as a raw material for polyester resins and benzoate plasticizers. Personal care products in which it is used include fragrances, deodorants, face make-up, nail polish, soaps, shaving and skin-care products.

Physical properties

Dipropylene glycol is hygroscopic and slightly viscous, with a viscosity of 1.07 cP at 20 °C. It is also soluble in toluene. Its three isomers have such similar physical and environmental properties that the commercial mixture can be evaluated as a single substance.

Safety and environment

Because of its high boiling point, dipropylene glycol has a very low vapour pressure. It is not classified as hazardous under GHS. It is biodegradable in the environment. The European Cosmetics Regulation lists substances that are prohibited or restricted for use in cosmetics, and dipropylene glycol is not on this list.

Отримання й хімія

Спосіб отримання

In the dominant industrial process for 1,2-propanediol, the direct hydrolysis of propylene oxide in the presence of water, dipropylene glycol is generated as well. It arises through the sequential addition of propylene oxide to 1,2-propanediol. The process starts by combining propylene oxide and water at a molar ratio of 1:15, at an initial temperature of 125°C and a pressure of about 2 MPa. The resulting mixture of 1,2-propanediol, dipropylene glycol, and tripropylene glycol is approximately in the ratio of 100:10:1. The three products are separated by three successive vacuum distillations.

Формула
C₆H₁₄O₃
CAS
25265-71-8
Зовнішній вигляд
Colorless liquid
Синоніми
DPG
Статус IFRA
Див. примітку

No IFRA Standard for the material itself (51st Amendment)

Фізичні властивості
Температура кипіння
230.5 °C
Температура спалаху
121 °C
Відносна густина
1.0206 g/cm3 at 20 °C
Показник заломлення
1.439 at 25 °C

У парфумерії

Its low toxicity and solvent properties make it an ideal additive for perfumes and skin and hair care products. It has a long-standing reputation for safe use as carrier solvent for personal care products. Fragrances are among its key applications, alongside solvents and cosmetic products.

Роль у формулі
01сполучний компонент
Форми випуску
синтетична речовина

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