Propylene glycol (PG) is an important raw material in unsaturated polyester resin, polyurethane resin, alkyd, epoxy resin, etc. Resins are commonly referred to as liquids that harden on the basis of heat, regulating agents, or light. Typically, modified or synthetic resins are used for production. They can be made from natural components with additives or made from synthetic polymers. The main use of resin is to transfer tension between fibers and protect against external factors. About 45% of the total consumption of propylene glycol is used in the epoxy, unsaturated polyester and polyurethane industries. Many of these unsaturated polyesters are used in surface coatings and reinforced plastics. Propylene glycol is mainly used for surface coating and glass fiber reinforced polyester resin (UPR). Propylene glycol can be used for printing ink and epoxy resin etc. as good solvent performance. In the following, we will get acquainted with the application of propylene glycol in 3 polyester resins, unsaturated polyester and alkyd resin Applications of monopropylene glycol.
Propylene glycol is used in the manufacture of high performance unsaturated polyester.Unsaturated esters are synthesized in the laboratory by the concentration of saturated and unsaturated anhydrides with glycols. The resulting condensate is mixed with styrene monomer to form the unsaturated polyester resin formula. When propylene glycol is mixed with 30% ethylene glycol or 20% diethylene glycol, a better balance of tensile strength, tensile modulus, elongation at break, tensile strength, impact resistance, surface hardness, abrasion resistance and water absorption It is obtained by baking resin.
Unsaturated polyesters are the third class of heat molding resins. They are produced with a density of one diol with a combination of saturated and unsaturated anhydrides.Condensing products (reactive resins) react highly with vinyl monomers, such as styrene, to form highly durable structures and coatings.The properties of the bonded resin depend on the types of anhydrides and glycols used and their relative amounts. Most commercial unsaturated polyester (UPR) resins are made from phthalic and maleic anhydride as unsaturated and unsaturated components, and propylene glycol as the diol in the polymer.Unsaturated polyester resins mainly in the production of fiber-reinforced plastics and plastic products full of hygienic materials, tanks, pipes, nets and high performance components for the marine and transportation industries such as closing panels and hulls, fenders , The hull of the boat is used. Unsaturated polyester resins are also used in coatings and adhesives.
Alkyd resins were first synthesized in the 1920s and, due to their excellent performance, continue to compete endlessly with growing synthetic-based polymer resins. Due to its high compatibility with many polymers and a large number of formulations, alkyds are superior to other systems in many applications with special demand. Adaptability, along with their biodegradability and possibly recyclability, makes alkyds extremely environmentally and economically attractive. Propylene glycol is used in the synthesis of alkyd resins.
Increased use of unsaturated polyester resin in various applications of reinforced plastics is predicted for the growth of the fuel market. Bio-based propylene glycol is widely used as a cooling and antifreeze due to its low freezing point and high viscosity, thus increasing its importance in the automotive and general industries. Increased automobile production and sales in developed as well as developing countries are expected to increase demand for bio-based propylene glycol over the next six years. It is predicted that the increase in demand for non-ionic surfactants and the increase in demand for adhesives, emulsifiers and lubricants based on propylene glycol will lead to market growth. The global market for bipropylene glycol is divided into five regions: Asia Pacific, Europe, Latin America, North America, the Middle East, and Africa. Asia-Pacific is expected to grow at the highest CAGR rate due to the large number of producers of polyunsaturated resins and polyester fibers, as well as increasing demand from the construction sector. Demand for Bio-based propylene glycol is expected to increase in developing countries such as China, Japan, India and Vietnam due to the growth of the commercial and organizational construction sector.