propylene glycol
English name: propylene glycol
Chemical Name: PG for short
CAS: 57-55-6
Molecular formula: CH3 CHOHCH2 OH
PG quality indicators:
Appearance: colorless, viscous and stable water-absorbing liquid, almost tasteless and odorless.
Boiling point: 188.2 ° C
Melting point: -59 ° C
Viscosity: (20 ° C) 60.5mpa.s,
Relative density (water = 1): 1.04
Steam pressure: 106Pa at 20 ° C
Flash point: 99 ° C (closed cup), 107 ° C (open cup)
Specific heat capacity (20 ° C) 2.49kJ / (kg. ° C),
Heat of vaporization (101.3kpa) 711kJ/kg.
Natural temperature: 421.1 °C
Solubility: Miscible with water.
Product category: Humectant
PG product application:
PG can be used as a raw material for unsaturated polyester resins. It can be used as a wetting agent in combination with glycerin in cosmetics, toothpaste and soap. It is used as a humidity control and leveling agent in hair dyes and as an antifreeze. It is also used in cellophane, plasticizers and the pharmaceutical industry.
PG product features:
1. A certain proportion of PG and water mixture can delay the hydrolysis of certain drugs and increase their stability.
2. When the concentration is selected properly, it can be used as an injection medium for quick-acting or delayed action.
3. A certain concentration of PG can be used as a penetration enhancer for the absorption of drugs through the skin or mucous membranes.
4, PG is an important raw material for unsaturated, this amount accounts for about 45% of the total consumption of PG. This unsaturated polyester is widely used in surface coatings and reinforced plastics.
5. PG is widely used as a moisture absorbent, antifreeze, lubricant and solvent in the food, pharmaceutical and cosmetic industries because of its good viscosity and hygroscopicity and its non-toxicity. In the food industry,
6, PG is mainly used as a food emulsifier;
7. PG is an excellent agent for seasonings and pigments. PG is commonly used in the pharmaceutical industry as a solvent, softener and excipient for the manufacture of various types of ointments and ointments. Since PG is highly miscible with various fragrances, it is also used as a solvent and softener for cosmetics.
8, PG is also used as a tobacco moisturizer, anti-fungal agent, food processing equipment lubricants and food marking inks.
9. The aqueous solution of PG is an effective antifreeze.
