The working principle and use of epoxy plasticizers

Epoxy compounds Epoxy compounds used as plasticizers mainly include epoxy fatty acid glycerides, cyclic There are three types: oxyfatty acid esters and epoxy tetrahydrophthalate. They generally use unsaturated esters as raw materials and are oxidized with peroxyacid. Since peroxyacids are unstable, hydrogen peroxide, carboxylic acid and reactants are usually added together during the reaction. So that as soon as the peroxyacid is generated, the reactant will be epoxidized.

Also, under the action of a catalyst, acetic acid is first oxidized with air, It generates peracetic acid, which is then epoxidized with the reactants. In addition to peracetic acid, peroxyformic acid is a stronger epoxidant,

The representative variety of epoxy fatty acid glycerides is epoxidized soybean oil:

Since soybean oil is a fatty acid ester of glycerol, its fatty acid The ingredients are oleic acid32%~36%, linoleic acid 52%~75%, palmitous acid 2.4%~6.8%, stearic acid 4.4%~7.3%, therefore, its composition is more complex.

Epoxy fatty acid glycerides have good heat resistance and weather resistance, low volatility, low migration, and good compatibility withPVC. PVC plasticizers are mainly used in heat-resistant wires and agricultural films. also. Since they are non-toxic, they are also used in food packaging materials,

Epoxy fatty acid monoester, due to the source of fatty acids(grease) and It varies depending on the raw material alcohol used. The role of plasticizers is such as oxidizable butyl soybean oleate, epoxy butyl stearate and octyl ester. Epoxy fatty acid monoesters are mostly light yellow transparent liquids. They have good low-temperature properties and can be used as cold-resistant plasticizers, but their migration is relatively large.

Epoxy tetrahydrophthalate is composed of1,3-butadiene and anidium maleate using a diene In the addition reaction, tetrahydro-o-masolate is first obtained, then esterified and finally epoxidized.

Epoxy tetrahydrophthalic acid Esters not only have the comprehensive performance of phthalates, but also have the advantages of excellent weather resistance and heat resistance of epoxy plasticizers.

Commonly used ones areEPS (ringOxygenFourHydrogenDioctyl phthalate) is a colorless to light yellow oil. Liquid, its plasticizing effect is equivalent to that of DOP, and it is non-toxic, mildew-proof, and has excellent photothermal stability. It can be used in films, sheets, artificial leather, cable materials andeachA kind of molded product.