Лако-красочные материалы — производство

Epoxy resin Adhesives. Epoxies [47], [48] are among the most widely used structural adhesives. These chemically reactive systems include two-component systems that cure at room temperature or elevated temperature and one-component systems, which usually require heat for curing. Epoxy thermoset adhesives, available in many formulations, can be used to join most materials. These adhesives have […]

Polymerization adhesives harden through radical or ionic polymerization of the monomers; at the same time, graft polymerization or cross-linking of the dissolved, still polymerizable polymers also may occur. Two-Component Polymerization Adhesives. The best known types are polymer­ization adhesives based on solutions of unsaturated polyesters in styrene or (meth)acry — lates. Peroxides are added as hardeners […]

Before setting, reactive adhesives consist predominantly of reactive low molecular mass monomers and/or oligomers that, during curing, are converted by chemical reactions into high molecular mass, often three-dimensionally cross-linked polymers. Reactive adhesives can be divided into polymerization, polyaddition, and polyconden­sation adhesives. Vulcanizing reactive adhesives are a special group. Reactive adhesives are marketed as one-pack, two-pack, […]

Emulsion-based adhesives are adhesives that contain aqueous synthetic resin disper­sions or emulsions or rubber latices as their principal raw material or active binder [41]. They are milky white, odorless liquids with solids contents of 40 — 60 %. In quantitative terms, emulsion-based adhesives are one of the most important groups of adhesives. They set by […]

Solutions of Polymeric Substances and Resins in Organic Solvents. A distinction is be drawn between adhesives that set by evaporation of the solvent and form an adhesive joint by adhesion of the dissolved polymer to the substrate surfaces, and adhesives for plastics, the solvent of which dissolves and swells the plastics surfaces and joins them […]

This group includes heat-sealing adhesives and high-frequency (HF) sensitive heat — seal coats; these are coating adhesives that are heat-activated during bonding. Contact adhesives and pressure-sensitive adhesives bond by the same principle but without the action of heat. Heat-sealing adhesives are applied to the materials to be sealed in the form of solutions, emulsions, or, […]

The same classification used in Chapter 1.5 is used here. Information on the uses of the adhesives discussed here can be found in Chapter 1.5. 1.6.1. Adhesives That Set Without a Chemical Reaction 1.6.1.1. Solvent-Free Adhesive Systems Hot-melt adhesives are 100 % solids that, in the broadest sense, include all thermo­plastic polymers. Polymers that are […]

Polyhydroxymethyl compounds: phenol-formaldehyde resins, also in combination with poly(vinyl formal) resins, nitrile rubber or epoxy resins (as adhesive film), urea — formaldehyde resins, melamine — formaldehyde resins, resorcinol — formaldehyde res­ins. Uses: wood (plywood manufacture), metals. Silicone adhesives, one-pack, setting under the influence of atmospheric moisture. Uses: glass, metals, ceramics, plastics; some substrates need a […]

Epoxy resin adhesives, polyepoxy compounds in combination with amines, polyami — doamines, or dicarboxylic acid anhydrides. Uses: metals, silicate-containing materi­als, plastics. Reactive polyurethane adhesives: polyurethane prepolymers with terminal hydroxyl groups or terminal isocyanate groups. Uses: plastics, metals, silicate-containing materials. Two-component silicone adhesives: setting induced by catalyst.

2.1. Formation and Cross-linking of the Adhesive Film by Polymerization. Two-pack polymerization adhesives: unsaturated polyesters with monomeric vinyl compounds, e. g., styrene or methyl methacrylate. No-mix adhesives and A/В acry­lates, applied without premixing. Uses: metals, plastics, silicate-containing materials. One-pack polymerization adhesives: a) Cyanoacrylate adhesives setting under the influence of moisture or alkalinity. Uses: metals, plastics, […]