1, 3-propylene glycol

1, 3-propylene glycol Classification: Cosmetic grade and Industrial grade

English alias: 1, 3-Dihydroxypropane; 1, 3 – PROPANDIOL; 1,3-PROPYLENE GLYCOL; AKOS 90317; AKOS BBS-00004418; PDO; PROPANE – 1, 3 – DIOL;

TRIMETHYLENE GLYCOL; 1, 3 – Propylenediol; 2-(Hydroxymethyl)ethanol; 2-Deoxyglycerol; beta-Propylene glycol; beta-propyleneglycol; I,3-Propandiol; NSC

65426; nsc65426; omega-Propanediol; propane diol-1,3; Propanediol-(1,3)-(1,3-propylene glycol)

Structure: HOCH2CH2CH2OH

CASNo. : 504-63-2

Appearance and properties: colorless, odorless, salty, hygroscopic viscous liquid. (pure)

Melting point (℃) : -27

Boiling point (℃) : 210-211

Relative density (water =1) : 1.05(25℃)

Relative vapor density (air =1) : 2.6

Saturated vapor pressure (kPa) : 0.13(60℃)

Flash point (° C) : 79
Ignition temperature (℃) : 400

Solubility: miscible with water, can be miscible in ethanol, ether.
Main Uses: Used as solvent for organic synthesis.

1, 3-propylene glycol (Propan-1,3-diol), is a chemical compound, the molecular formula is C3H802, the molecular weight is 76.10, colorless transparent viscous liquid. It can be used for the synthesis of many drugs, new polyester PTT, pharmaceutical intermediates and new antioxidants.
It is a raw material for unsaturated polyesters, plasticizers, surfactants, emulsifiers, demulsifiers, surfactants, emulsifiers and demulsifiers.
In the polyurethane industry, it is commonly used as the raw material of polyester polyols, the initiator of polyether polyols and the chain extender of polyurethane.
In the organic chemical industry, it is also an important monomer and intermediate, the most important use is as a polymer monomer to synthesize fruit terephthalate propylene glycol vinegar, skin after exposure to uranium, should remove contaminated clothing, wash with flowing water. After eye contact, lift eyelids and rinse with running water or saline.
It can be used for the synthesis of many drugs, new polyester PTT, pharmaceutical intermediates and new antioxidants.

1, 3-propylene glycol product introduction
1, 3-propanediol (1, 3-propanediol, 1, 3-PDO) is a colorless, odorless, salty, hygroscopic viscous liquid. It is a raw material for the production of unsaturated polyester, plasticizer, surfactant, emulsifier and demulsifier. In the polyurethane industry, it is commonly used as the raw material of polyester polyol, the initiator of polyether polyol and the chain extender of polyurethane. In the organic chemical industry, it is also an important monomer and intermediate, and the most important use is as a polymer monomer to synthesize polypropylene terephthalate (PrT).

1, 3-propylene glycol preparation method
The chemical preparation of 1,3 monopropylene glycol by glycerol can be divided into dehydroxylation, hydrodehydrating and dehydrating to acrolein. Among them, the reaction steps of dehydroxylation method are clear, the reaction speed is fast, the by-products are less, and the separation is easy, which is conducive to the conversion of glycerol into 1, 3-propylene glycol. However, the reactant material, sulfonyl chloride, is a fine chemical, the production is small and the price is high, which affects the industrialization of the method. With the increasing demand for 1, 3-propylene glycol in the world, the selective catalysis of glycerol will be the focus and difficulty of research. There are relatively few studies on the production of 1, 3-propylene glycol by catalytic hydrolysis, and the main products of hydrolysis are 1, 3-propylene glycol and 1, 2. A mixture of propylene glycol with poor product selectivity. Therefore, the improvement of separation technology will be another challenge for glycerol-catalyzed hydrogen hydrolysis.
When adding H2WO4 and basic substances (amines or amides) to the homogeneous catalytic system of rhodium complex Rh(CO)2(aaac), glycerol can be hydrolyzed to 1, 3-monopropylene glycol with a yield of 21% under appropriate conditions. At the same time, almost the same amount of 1, 2-propylene glycol is produced. In the preparation of 1,3 monopropylene glycol by acrolein method, glycerol must be converted into acrolein by catalytic dehydration.

Propylene glycol (PG) is mainly used in the production of coatings and unsaturated polyester resin (UPR), in addition to being used as an antifreeze, replacing ethylene glycol for antifreeze aircraft and as a coolant in food. In addition, there are a large number of propylene glycol used in the production of plasticizers and hydraulic brake fluid, it can also be used in non-ionic detergents and in medicine, cosmetics, animal food, tobacco industry as a moisturizer, propylene glycol is also a good solvent can be used in ink and epoxy resin and other aspects of the manufacture of unsaturated polyester resin (for paint and glass fiber reinforced resin) accounted for 27%; Manufacturing functional fluids (antifreeze, deicing agent, heat transfer fluid) accounted for 20%; Food, pharmaceutical and cosmetic uses accounted for 20%; Liquid detergent use accounted for 17%; Paints and coatings accounted for 5%; Tobacco moisturizers in the field 2%; Other uses, including plasticizers, accounted for about 9 percent. The use of propylene glycol in cosmetics and liquid detergents is still growing rapidly, with annual growth rates of more than 3% and 315%, respectively, and cosmetics manufacturers use it as an emollient ingredient in personal health products, including antiperspirant, deodorant, sunscreen, shaving cream and beauty balm. In liquid detergents, propylene glycol acts as an enzyme stabilizer and solvent.
Propylene glycol stearate main uses: in the daily chemical industry for the manufacture of cream cosmetics, so that cream agents increase lubricity, fineness and stability, and have moisturizing effect, such as used in lip balm. In the pharmaceutical industry, it is used in the manufacture of emulsions, ointments, suppositories, etc. Propylene glycol methyl ether acetate is a low-toxicity advanced industrial solvent with excellent properties. It has a strong ability to dissolve polar and non-polar substances. It is suitable for solvents of various polymers of high-grade coatings and inks, including aminomethyl ester, vinyl, polyester, cellulose acetate, alkyd resin, acrylic resin, epoxy resin and nitrocelluloses. Among them. Propylene glycol methyl ether propionate is the best solvent in paint and ink, suitable for unsaturated polyester, polyurethane resin, acrylic resin, epoxy resin (resin usually refers to the softening or melting range after heating, softening under the action of external forces have a tendency to flow, at room temperature is solid, semi-solid, and sometimes can be liquid organic polymers. Broadly speaking, any polymer that can be used as a raw material for processing plastic products is called a resin.
Propylene glycol ether and ethylene glycol ether belong to the same binary alcohol ether solvent, propylene glycol ether toxicity to human body is lower than ethylene glycol ether products, can be regarded as non-toxic or low toxic products, because of its molecular structure has both ether functional groups and hydroxyl groups, so its solubility is very good, but also has suitable volatility and reactivity characteristics, so it has been widely used. In addition to the solvents used in a variety of high-grade coatings, it can also be used in chemical intermediates, brake fluids, cleaning agents, anti-icing agents and many other fields.
Cleaning agent: Low toxicity, low surface tension, and rapid evaporation are the advantages of ARCOSOLV PM in the cleaning industry. It can provide good solubility for polar and non-polar substances.
Chemical intermediates :ARCOSOLV PM can be combined with other ARCOSOLV P-series alcohol ethers or solvents to suit the needs of various formulation designs. ARCOSOLVPM has a very low primary alcohol content, generally less than 2%. The primary alcohol isomer is more active than the secondary alcohol isomer. The low content of primary alcohol means the lowest content of side chain structure.
Electronics :ARCOSOLV PM can be used in combination with other solvents for lamination of printed circuit board products. In addition, ARCOSOLV PM can be used for cleaning and welding melt removal and stain cleaning.
Cleaning agents: Since ester solvents readily hydrolyze in water-based, strongly alkaline cleaning agents, the ARCOSOLV propylene glycol ether series is generally superior to its ester products.
However, solvent-based cleaning agents, including metal degreasing and specialized equipment cleaning,PMA or its mixtures are used in place of chlorine-containing solvents.
ARCOSOLV PMA has a very wide range of dissolution capabilities, and its dissolution properties are closer to chlorine-containing solvents than ethylene glycol ethers or esters. Electronic products: ARCOSOLV PMA can be used to replace EEA in photosensitive resins used in semiconductor processing, mainly for the processing of anodic photosensitive materials.
Propylene glycol butyl ether chemical uses because of its very low toxicity, pleasant odor, is a promising environmental solvent. Used in industrial/household detergent formulations, it is extremely safe and recognized by many developed countries, especially Japan. And because its HLB value is close to the middle of water/oil, there is great room for development in coating/ink/detergent formulations. Propylene glycol butyl ether is a green environmental protection type of advanced solvent, in paint, cleaning agent, ink, leather and other aspects have a wide range of applications. On painting
In the material industry, it can be used as a solvent for alkyd resin, epoxy resin, acrylic resin, polyester paint, etc. The prepared paint film is smooth, smooth and has good fastness. In the process of dye dissolution, it can be used instead of alcohol solvent, and is a good coupling agent. In the production of ink, the use of propylene glycol ether, some formulations can be changed to water-soluble, so that the ink toxicity is reduced, the operating environment is improved, and the printing quality is improved. Propylene glycol ether products can be prepared to concentrate all kinds of cleaning agents, the effect is good. In the new brake fluid, its content can be up to more than 40%, is one of the main components of brake fluid. In addition, propylene glycol ether can also be used in colorful coatings, photosensitive adhesives, PS plate cleaning, printing, electronic chemicals, jet engine fuel additives (water repellent), extraction agents and high boiling point solvents.