Introduction to Acrylic Monomers
Introduction to Acrylic MonomerAcrylic monomer is an ester compound produced by the reaction of acrylic acid and alcohol. Its chemical formula is C ∝ H ₄ O ₂. Its molecule contains carbon carbon double bonds and ester groups, so it has strong reactivity and can undergo many chemical reactions, such as free radical polymerization and addition reactions.
In terms of classification.
Common ones include methyl acrylate, ethyl ester, butyl ester, 2-ethylhexyl ester, etc.
Special acrylic esters: Monofunctional monomers such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, lauryl acrylate, glycidyl acrylate, isobornyl acrylate, tetrahydrofurfurfuryl acrylate, etc. They have low viscosity, small shrinkage, and can make things more flexible.
Dual functional monomers, such as polyethylene glycol diacrylate and dipropylene glycol diacrylate, can cause branching or cross-linking of things, improving strength and heat resistance.
Multi functional monomers (with three or more functional groups), such as trimethylolpropane triacrylate and pentaerythritol tetraacrylate, can make cross-linking tighter, thereby improving high temperature resistance, chemical resistance, hardness, abrasion resistance, and curing speed.
Physical properties.
Status and odor: Most of them are usually colorless and transparent liquids with a special odor.
Solubility: It can generally dissolve in organic solvents such as ethanol, ether, benzene, acetone, and chloroform, and some can also dissolve slightly in water.
Density: The density is smaller than that of water, and the density varies among different types.
Boiling point: The longer the molecular chain and the larger the relative molecular weight, the higher the boiling point.
Chemical properties.
Aggregation reaction: This is its most important chemical property. Under the action of initiators, the carbon carbon double bonds in its molecules will open and then connect one by one to form high molecular weight polymers, which can be used to make various acrylic resins.
Addition reaction: Carbon carbon double bonds can also undergo addition reactions with hydrogen, halogens, hydrogen halides, and other substances to generate new products.
Hydrolysis reaction: Under acidic or alkaline conditions, its ester group undergoes hydrolysis to form acrylic acid and the corresponding alcohol.
Purpose.
In terms of adhesives, they are important materials for making various adhesives, such as pressure-sensitive adhesives, anaerobic adhesives, instant adhesives, etc. They can bond materials such as metal, plastic, rubber, wood, and paper together.
In terms of coatings, it is used to make many coatings such as architectural coatings, automotive coatings, industrial coatings, etc., which can improve the adhesion, weather resistance, water resistance, and chemical corrosion resistance of coatings.
In terms of ink, it is widely used in flexographic ink, offset printing ink, and screen printing ink, which can make the ink stick more firmly, resulting in clearer and more durable printed patterns.
In terms of plastics, polyacrylic acid ester plastics can be produced through polymerization reactions, which are used as packaging materials, electronic product casings, automotive components, etc. They have good performance, such as chemical resistance, heat resistance, and mechanical properties.
In terms of textiles, they can be used for finishing and processing such as waterproofing, wrinkle prevention, and stain prevention, as well as for making textile pulp, making textile processing more convenient and of better quality.
Simply put, acrylic ester monomers are extremely useful and many industries cannot do without them.
