Acrylic
Sunday, January 17th, 2010Acrylic Introduction
Acrylic resin is acrylic and methacrylic acid esters, and other ene monomers are made of resin, the resin through the use of different structures, different formulations, production processes and solvent composition can be synthesized in different types, different properties and different applications of acrylic resin, acrylic resin film according to the structure and mechanism of the difference can be divided into thermoplastic and thermoset acrylic resin, acrylic resin.
Acrylic ester and methacrylic acid ester monomers of acrylic resin, synthetic light the main absorption peak in the solar spectrum outside, so obtained acrylic resin paint has excellent lightfastness and outdoor aging.
The use of acrylic resin
Thermoplastic acrylic resin film-forming process does not occur in the further cross-linked, so it’s relatively large molecular weight, has a good security light color retention, water resistance, chemical resistance, dry fast, convenient, easy-to-construction re-coating and rework, Preparation of aluminum when the aluminum powder paint whiteness, location is good. Thermoplastic acrylic resin in the automotive, electrical appliances, machinery, construction and other fields are widely used.
Thermosetting acrylic resin is defined as structure with a certain amount of functional groups, in the paints, when adopted and entered into the amino resin, epoxy resin, polyurethane and other functional groups in response to the formation of network structure, thermosetting resins in general a relatively low molecular weight. Thermosetting acrylic paint has excellent fullness, luster, hardness, solvent resistance, weather resistance, do not change color when baking at high temperatures, non-yellowing. The most important application is made with the amino-and amino resins – acrylic paint, is currently in the automotive, motorcycle, bicycle, rolled steel and other products is widely used.
Classification of acrylic resin
According to production methods, the classification can be divided into:
1, polymerization! Through the monomer, initiator and reaction solvent with the reaction of polymerization, generally into the resin as the solid content of 50% of the resin solution! Is a solvent containing about 50% of the resin, the general reaction of the solvent used for the benzene (toluene or xylene), esters (ethyl acetate, butyl acetate), generally a single or a mixture! Solid emulsion of acrylic resin with a solvent immutability! Usually a result of the choice of solvent is not the same as performance of different Er Shi! Generally have a certain color! The glass transition temperature lower, because the general is not down with methyl acrylate reaction! Solid resins of this type can have a higher solid content can be up to 80%! To do high-solid coating, the production is simple! But non-denaturing solvent, transportation inconvenient!
2, suspension polymerization! Is a more complex production process, is generally used as the production of solid resin and a method! Solid acrylic resin, which are generally used with a reaction of methyl acrylate polymerization continues! Without methyl acrylate are generally with a certain degree of functional group! The Fu River in the polymerization reaction in the reaction difficult to control, easy to sticky and to the explosion pot! The general process is the monomer, initiator, auxiliary input response to ax and then placed in distilled water in reaction! In a certain reaction time and temperature after washing, then drying! Filtering and so on! Production control of their products more stringent! If a link in the middle of which do not place their products out there will be some effect! Is generally reflected in the color difference between the top and molecular weight!
3, bulk polymerization! Is a more efficient production process! Is usually the raw material into a special plastic film! Reaction into a junction block and then come up with crush, and then filter made, the general way of producing the kinds of solid acrylic resin and the purity of all the production method can be the highest! The stability of his products is the best, but he was also quite a big disadvantage! Body with benzene polymerization of acrylic resins for solvent solubility is not strong! Sometimes the same the same ratio of monomer to be difficult to dissolve with the suspension polymerization several times! And the pigment dispersion not as suspension polymerization of acrylic resin!
4, other polymerization methods! Solvent reaction continues via the solvent acting as intermediaries with the material! The reactor off after a good solvent!
