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The main components of soybean oil are linoleic acid (51~57%), oleic acid (32~36%), palmitic acid (2.4~2.8%), stearic acid (4.4~4.6%), and epoxidizing agent available in the presence of catalyst. Emulsion soybean oil can be obtained by the action of soybean oil. Epoxidized soybean oil used in the coating industry is partially epoxidized soybean oil, in which unsaturated double bonds and epoxy groups coexist, and each molecule contains 3 to 4 epoxy groups. In addition to ultraviolet (UV) radical-curing epoxy oleoresin acrylate systems, some studies have also involved cationic curing systems. Epoxidized soybean oils have low viscosity and moderate polymerization rates, making them ideal for cationic photocuring systems. In addition, the use of epoxy soybean oil or its extracts in combination with some commonly used coating systems is also a hot topic in the research and development of epoxy soybean oil systems in recent years. Cationic light-cured epoxy soy bean oil coatings have become more widely used. Although the variety of photo-curing coatings varies and their properties vary, their main components generally include: cross-linkable prepolymers, photoinitiators, reactive diluents, and possibly organic inorganics. Filler and so on.
Epoxidized soybean oil is used as a photocurable host resin in a cationic curing system. Its main advantages are: First, the adhesion between the cationic cured film and the substrate is significantly enhanced. Although the epoxy compound polymerization also exists by the van der Waals force The volume shrinkage caused by the distance between the assimilated covalent bonds, but due to the polymerization of the epoxy monomer, the ring structure in the monomer is opened to form a chain structure unit larger than the monomer molecule structure, cancelling part of the volume shrinkage, Makes the cationic cured film stronger in adhesion; second, cationic assimilation is not inhibited by oxygen, and rapid and complete polymerization can be obtained in the air atmosphere; third, cationic curing has a “dark reactionâ€, so the cationic curing coating is applied over time. The solvent resistance of the membrane is greatly increased. UV free radical curing epoxy soy oil acrylate coatings are gradually emerging. Epoxidized soybean oil acrylate is obtained by esterification reaction of acrylic acid and epoxy soybean oil. The reaction is essentially the addition reaction of carboxylic acid and epoxy group. The commonly used catalysts in the reaction are: NN dimethylaniline, NN dimethylbenzylamine, triethylamine, 1,4-diazabicyclo[2.2.2]-octane, triphenylphosphine, and the like.
Due to the long molecular chain of epoxy soybean oil acrylate and the low cross-linking density, the toughness and adhesion of the coating can be significantly improved. Considering the fact that the price of epoxy soybean oil is cheaper, epoxy-based soybean oil based acrylate-based photosensitive coatings have broad prospects for development. Research on epoxidized soybean oil acrylate coatings at home and abroad is very active, and US UCB companies have already conducted Commercial production such as Ebecry 860. The synthesis of epoxy soybean oil acrylate generally adopts two methods: direct esterification reaction of epoxy soybean oil with acrylic acid, use of half ester modification method, and the first method that is widely used at present. The application of epoxy soybean oil in other coating systems has also continued to increase. Epoxy soybean oil has low viscosity and good molecular chain flexibility. It can be mixed into some common coating systems and used as a modifier, which can effectively improve the performance of the original system and reduce production costs. In addition, the epoxy soybean oil extract or a series of coatings prepared by converting the epoxidized soybean oil also shows good usability and the development prospect is very attractive.
The application of epoxidized soybean oil after effective conversion is a development direction in recent years. Addition of epoxidized soybean oil and methylamine can be used as an anti-corrosion agent for coatings. The research results of soy oil phosphate polyhydroxy compounds have opened up a way for the coating industry to produce new coatings with high toughness and good durability at low cost, and the preparation process is pollution-free and very valuable for commercial development. Low-cost, environmentally-friendly epoxy soybean oil has become a research hotspot in the coating field at home and abroad in recent years. For example, Lowa State University and Bowling Green University in the United States have conducted in-depth research on the application of epoxy soybean oil in coatings. Currently cationic curing epoxy varnish is used as top coat for beer cans. The varnish has excellent adhesion, high toughness, and can withstand the stringent requirements of high temperature sterilization during canning. When used as a can of varnish, there is no pinhole in the surface layer and the appearance is beautiful. Epoxy soya acrylate coating can be used as surface metallized film coating, suitable for making paperboard varnish, varnish, wood varnish, pigment and so on. With the development of the paint industry towards environmental protection and energy conservation, the application of epoxy soybean oil will be further broadened.
Epoxy Soybean Oil (ESO) Research for Domestic Coatings Continues to Advance
Epoxy Soybean Oil (ESO) is a raw material with abundant resources, low cost, non-toxicity, environmental friendliness, thermal stability, light stability, and solvent resistance. It is widely used in PVC plasticizers, food packaging materials, and pharmaceutical products. Etc. With the development of the paint industry to save resources, energy and reduce pollution, epoxy soybean oil has attracted the interest of researchers at home and abroad with its unique properties. Epoxy soybean oil has new progress in cationic light curing system, epoxy soybean oil acrylate coating system and other coating systems, and its application prospect is very broad. In recent years, the research of epoxy soy oil for domestic coatings has mainly focused on ultraviolet (UV) free-radical curing epoxy soy oil acrylate systems, which are inexpensive, have good photosensitivity, and have good coating performance.