Insoluble and infusible acrylic polymerization based on acrylic monomers (methyl acrylate, ethyl acrylate, n-butyl acrylate, methyl methacrylate, n-butyl methacrylate, etc.) as a basic component and crosslinked into a network Thing.
In addition to the general properties of acrylic resins, heat resistance, water resistance, solvent resistance, and abrasion and scratch resistance are better. There are various forms of body casting materials, solution type, emulsion type, and water-based type.
The bulk casting material is prepared by copolymerizing methacrylate with polyfunctional acrylic monomers or other polyfunctional olefinic monomers to form a slurry. Mainly used as aircraft hatch and windshield. Solution-type, semi-emulsion-type, and water-based thermosetting acrylic resins need to be heated and crosslinked to form a film to form a network structure.
There are two types of cross-linking methods: (1) reactive cross-linking, functional groups in polymers do not have cross-linking reaction capabilities, and cross-linking components with at least two functional groups must be added (such as melamine resin, epoxy resin, urea resin And metal oxide, etc.) are cross-linked and cured by reaction, and the cross-linking component cannot be stored for a long time, and should be used in time; (2) self-crosslinking type, the polymer chain itself contains two or more reactive functional groups ( Hydroxyl group, carboxyl group, amide group, methylol group, etc.), heated to a certain temperature (or adding a catalyst at the same time), the functional groups react with each other to complete the crosslinking. This type of thermosetting acrylic resin is mainly used as fabric, leather, paper treatment agent, industrial paint and architectural coating.