Dimethyl ether (DME) properties: It is a colorless and tasteless inert gas.
Molecular formula: CH3OCH3
Molecular weight: 46.07
Boiling point: -24.9°C
Explosion limit: 3.4~18%
Spontaneous ignition point: 350°C
Heat of combustion: 6900kcal/kg
Flash point: -41°C Viscosity: 0.0102CP (20 °C)

With certain solvent strengtheners, such as 6% alcohol, dimethyl ether and water can be mutually soluble in any proportion.Once its KB value is 60, it has perfect solubility.It can be mutually soluble with LPG, CFCS, alcohol, ketone, ether and so on. Dimethyl ether DME has wide applications, can be used as solvent, aerosol, foaming agent, extractant and so on.High purity dimethyl ether can also be used as an anesthetic.When used as fine chemical products, it can replace the previous chlorofluorocarbons as propellants that are not harmful to the environment. The solubility of dimethyl ether is similar to that of chlorofluorocarbons, in addition to dimethyl ether, propane, butane, butane aerosol can also be used.Now more and more aerosol manufacturers are gradually using dimethyl ether as aerosol propellant.

1.Insecticide spray Dimethyl ether DME is widely used in insecticide spray.It can dissolve in water, and the use of water-based formulations of dimethyl ether can create a comfortable environment.

2. Indoor air freshener The strong solubility of dimethyl ether DME enables it to dissolve 30% into water.Adding more than 6% alcohol can reach the limit of mutually soluble with water in any proportion. Some emulsifiers are used to emulsify the essence into alcohol, and then the aqueous phase forms a stable single phase.

3. Hair gel On the one hand, propane butane is used as propellant gas, which leads to the emission of high volatile organic compounds.On the other hand, high concentration of alcohol may damage hair, resulting in hair breakage and splitting.Therefore, formula technicians began to develop alcohol-free or less alcohol hair gel.Due to its perfect dilution, dimethyl ether DME quickly became the main alternative propellant gas used in hair gel products.

4.Spray paint There are some disadvantages in using propellant gases with lower dilution such as propane butane and fluorocarbon.Foam may be produced during use.This may lead to poor paint surface.The application of dimethyl ether DME in the spray paint industry not only solves the above disadvantages, but also forms a perfect spraying effect, with fine and uniform droplets and moderate spraying force. Problems to be noted when using dimethyl ether as propellant gas
1.Anticorrosive Aerosol corrosion includes chemical and electrochemical corrosion.Each component should be collected with full attention.Because dimethyl ether DME is used as propellant gas, attention should be paid to prevent the corrosion of packaging by water and dimethyl ether DME.Therefore, water must be deionized.If possible, vacuum the air in the top space of the tank.Adjust the pH value of the product between 7 and 10.Add preservatives such as sodium benzoate.
2.Safety DME is a flammable gas.After formulation, the flammability is adjustable because it can be highly miscible with water.It can be reduced to flammable or non-flammable.
3.Valves and seals The valve cup will come into contact with DME.The unique solvent properties of DME may corrode the valve cup or paint, especially in the case of water or alcohol.This should be especially considered when DME is regarded as a propellant gas. In addition, due to the perfect solubility of DME, some sealants may have problems.The preferred expansion rate of the sealant is 5%-15%, and the time is 72 hours.If the expansion ratio is too large, leakage may be a big problem of DME. 4. Manufacturing, storage and transportation DME is actually stable, even if it is a product of ether.After testing, pure dimethyl ether and other substances were mixed at 40 °C for 6 months, and no peroxide was produced.Even so, we still pay attention to the safety of production, storage and transportation.Electrical appliances must be explosion-proof;DME must be stored in a cool, well-ventilated condition;do not hit and drop the aerosol can during transportation;do not go near a fire.