What are the raw materials of epoxy resin plastics
What are the raw materials of epoxy resin? Epoxy resin is composed of epoxy resin, curing agent, filler, pigment and release agent. The most commonly used of the epoxy resin is the liquid and solid bisphenol A glycidyl ether type resin. In addition, it is also useful for the multi-functional resin of the epoxidation thermoplastic phenolic resin. The latter not only has fast gelation speed, but also has large crosslinking density after curing, and the chemical stability, heat resistance and thermal resistance (including thermal change) of the products. The temperature of the shape is better.
The pericyclic epoxy resin made by peracetic acid has a high thermal deformation temperature because of its close chemical structure. The dielectric constant is stable, the loss factor is low, the arc resistance is low, the arc resistance is good, and the weather resistance is good. It is very suitable for the industry to apply to industry. A kind of epoxy resin can be used separately in the manufacture of plastics, but it is often used in mixed use, considering the fluidity of the plastic, the speed of the gelation and the heat resistance of the cured resin.
The curing agents are polyamine, such as interamine MPDF MPDF, two amino two benzyl methane DDM, and solid acid anhydride such as phthalic anhydride PA, dianhydride dianhydride PMDA, latent sclerosing agent such as BF3- amine complex, dicyandiamide and so on. In addition, melamine derivatives and guanidine are also used as curing agents. When bisphenol A or resorcinol can be added as catalyst, the tertiary amine can be added as catalyst when anhydride is added.
The commonly used filler is silica, mica, clay, talcum powder, calcium carbonate, hydrated alumina, carbon black, graphite and so on. The amount of the filler is 40%-85% according to the requirement of the type and fluidity of the filler. In order to improve the impact resistance of products, glass fiber, asbestos, nylon or polyester fiber filler can be used, the dosage is 10% to 50%. When used as a plastic for transfer molding, the amount of fiber filler can not be increased. After adding the filler, the density of the epoxy resin is generally 1.60-2.20kg/L, and the density of the products can reach 0.75 1.0kg/L when some special filler, such as glass or other synthetic resin, is used.