Application and operation method of silane coupling agent in composite materials-Iota

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News > Dynamic industry > Application and operation method of silane coupling agent in composite materials

Application and operation method of silane coupling agent in composite materials

Silane coupling agent is one of the most important and widely used treatment agents. It was originally developed as a treatment agent for FPR glass fiber. Subsequently, along with the development of new compound, it is gradually applied in various fields. Now, silane coupling agent is basically applicable to all inorganic materials and organic materials of the connection surface.
Application in composite materials
1, thermosetting resin inorganic fillers and inorganic materials and thermosetting resin composite materials made of the most widely used, silane coupling agent in this area is the earliest and most mature.
Comparison of unsaturated polyester with a variety of unsaturated silane coupling agent in the glass fiber of polyester laminate. For the majority of general polyester, the use of a silane coupling agent containing methyl methacrylate. In the typical of the polyester casting parts, the use of various fillers and the use of methyl groups of the silane can be used to improve the performance of the different degree of improvement.
Epoxy resins are quite effective for epoxy resins, but some general rules for selecting the most suitable silane for a specific system. The reactivity of the coupling agent is comparable to that of the specific curing system used in the epoxy resin. The alicyclic epoxide group or with an anhydride cured epoxy resin, it is recommended with cycloaliphatic silane (such as: A-153) for containing shrink glycerin group of epoxy resin, apparently use shrink glycerin epoxy propyl silane is appropriate. In practical application, the silane coupling mechanism is not always clear, but can be combined with application experience, such as the use of primary amine groups of the silane to get the best performance of room temperature curing epoxy resin, but not for silane anhydride cured epoxy resin chlorinated propyl groups of high temperature curing epoxy resin is a very reliable coupling agent containing methyl acrylate silane is effective coupling agent for the dicyandiamide curing epoxy resin.
Phenolic resin silane coupling agent can be used to improve almost all of the phenolic resin composite. Amino silane and phenolic resin binder used glass fiber insulation materials and resorcinol - formaldehyde latex dipping liquid of - formaldehyde resin and phenol formaldehyde resin resorcinol together for glass fibre tyre online, and furan resin and phenolic resin are used together as metal foundry core sand binder amino silane and phenolic resin and can be used in oil well sand fixation.
2, thermoplastic resin with silane treatment of granular inorganic filler can significantly improve the rheological properties of thermoplastic resin, and in the work, such as mixing extrusion or injection mold, such as high shear force, the protection of the filler from mechanical damage.
Polyolefin for extrusion method cable package layer containing polyethylene packing available silane modified, in order to improve the electrical performance of composites under wet condition.
Thermoplastic engineering plastics are suitable for the organic functional groups of epoxy resin, and can also produce good results in the filling of inorganic fillers. Amino silane can be used for a large number of thermal plastic plastic, such as ABS, acetal resin, nylon, polycarbonate and polysulfone (PSF), polystyrene, polyester, polyvinyl chloride, styrene acrylonitrile copolymer.
In the rubber, elastomer is used to deal with the history of carbon black, silica and other inorganic fillers for many years. A radial tire, rubber roller, senior soles of rubber products have been extensively used silane coupling agent and silane containing sulfur has become indispensable in the rubber formulation processing agent. The research shows that, with the increase of the adhesive strength, the other properties can be changed, and the change of the type of rubber is changed.
Using method of silane coupling agent
The most simple method for the coupling modification of granular materials in liquid resin directly by the direct mixing method in the mixture. Such as mixing of rubber, the direct incorporation of silane granular filler for immediate treatment. The effect of the addition of silane depends on the adsorption capacity of the fillers during the mixing operation.
The method of treating the organic solvent with silane is to mix the fillers with the dilute solution of the silane in organic solvents, and then filter and dry. Compared with the use of water solution, the water in the packing surface of the silane is more close to the single molecular layer, and the treatment of fine particles with the water solution is different, and the dry time is not agglomerate.
In the treatment of glass fiber with water solution, the silane (and other complex agent) is used in water treatment. The coarse grain fillers such as glass beads and glass fibers are very effective and easy to dry and not agglomerate. Fine particle filler can also be treated with the water solution, but need to use the spray drying method, so as to form lumps.
Dry mixing method to deal with filler, it is hoped that the high surface area of the filler can be stable dry powder form retained a large number of silane, so that when it is mixed with resin or other non treated filler, there will be a migration of monomer silane. The full dispersion of silane on the surface of the filler may take a few days or more. The transport and storage time are usually sufficient to disperse the silane in a large number of treated fillers. In general, ethoxy silane or propylene silane than silane on the filler surface is much more stable. In the composite materials, the characteristics of organic polymer and inorganic material, and the proper use of the organic polymer and inorganic material are considered.

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