Definition and Usage Areas of Dipropylene glycol
Dipropylene glycol [HO-(CH3-CHCH2O) 2-H] is a clear, colorless, slightly viscous liquid that is much less hygroscopic than other common glycols. It is an excellent solvent completely miscible with water and ethanol, benzene, toluene, castor oil, carbon tetrachloride, many organic compounds. CH3CHOHCH2OH is also an excellent cross-solvent or co-solvent.
Dipropylene glycol is a dihydroxy alcohol and undergoes reactions specific to this type of compound. Of greatest commercial importance are the reactions in which various ether and ester derivatives are formed. CH3CHOHCH2OH diesters prepared by the reaction of dipropylene glycol and acids can be used as plasticizers, fuel additives, resins and dyes, and cosmetic ingredients. A particularly important reaction of CH3CHOHCH2OH is with unsaturated dibasic acids such as maleic acid or fumaric acid. The resulting unsaturated polyester resins can then be crosslinked with styrene.
As a solvent, dipropylene glycol is a component of hydraulic brake fluids, cutting oils and textile oils. The inks are an excellent solvent, especially for the vapor set types and for those used on food packaging where deposits and odors must be free.
Dipropylene glycol is stainless. It has low vapor pressure and high flash point. As a result, it is easily processed under ordinary commercial conditions. Mild steel is satisfactory for storage tanks except where color requirements are critical. Resin-lined steel, stainless steel or aluminum tanks protect against discoloration and minor iron contamination. Covering storage tanks with inert gas is generally not required.
Polyester resins prepared from dipropylene glycol tend to be more flexible and less crystalline than those prepared from ethylene glycol.
Dipropylene glycol polyesters are not as water sensitive as diethylene glycol polyesters. Urethane, ranging from rubberized plastics to foams, is synthesized from diisocyanates and polyesters containing dipropylene glycol. The properties of urethanes are determined by the acid and glycol ratios used in the preparation of the polyester component. Urethanes have end uses as adhesives, elastomers, foams, molding compounds and surface coatings.
- Dipropylene glycol is used as a heat transfer fluid for both low and high temperature applications.
- It is used as a high-temperature reaction medium in the synthesis of some drugs, and also as antifreeze.
- Dipropylene glycol has germicidal properties and can be used as an air purifying agent.
- It is used as a solvent in many sectors.
- DPG finds application in the production of mainly industrial intermediates, unsaturated polyester resins, plasticizers, alkyd resins, cosmetics and urethane polyols, and is included as an additive in the formulations of antifoaming agents, industrial soaps and functional fluids.
- DPG; It is a solvent and is used as a moisturizing agent, acting as a diluent and/or carrier in fragrance and deodorant applications, and is involved in diluting fragrance oils.
- DPG; It acts as an additive in many cosmetic product formulations such as hair care and bath products, deodorants, shaving and skin care products.
- Propylene glycol, dipropylene glycol and tripropylene glycol; solvent, softener, emulsion stabilizer or viscosity modifier in fragrance, cosmetics and personal care products; humectant due to its hygroscopic nature and ability to retain water; It is used as a preservative against many bacterial and fungal species.
- In skin care products such as creams, moisturizers, cleansers, lotions, sun care products; in deodorants; in hair care products such as shampoo, coloring products; in shaving products such as creams, foams, gels and aftershave lotions; in bath and shower products; in perfumes and colognes; in baby care products; It is included in cosmetic products such as eyeliner and lip paint, and in formulations of oral care products such as mouthwash and toothpaste.