Automotive intermediate coating, also known as secondary pulp, is used for coating between automotive primers and topcoats or basecoats. It is required to be firmly attached to the surface of the primer and can be easily combined with the topcoat coating on it to play an important role. In addition to good adhesion and bonding with the top and bottom coatings, the intermediate coating should also provide good mechanical properties and provide protection against the topcoat. The intermediate coating should also have a flattening property to eliminate the surface of the coated object. The hole, the grain, etc., to make a flat surface, so that after the finish is painted, a smooth, full-bodied coating is obtained, which improves the vividness and fullness of the entire paint film, so as to improve the decorativeness of the entire coating; It has good sanding properties and can be polished to give a smooth and smooth surface.
Putty, two primers and seal primer are the intermediate layers of the coating, ie the middle coat, the putty is used to fill the uneven parts of the construction object, generally thick slurry, high pigment content, coating The mechanical strength is poor and easy to fall off. Therefore, the new cars produced by a large number of assembly lines are no longer used with putty, and sometimes only used for automobile repair. The sealer is the last intermediate layer coating before the coating. The coating is bright or semi-bright. It is generally used in coatings with high decorative requirements (such as automotive repair). This coating is required before the topcoat. Apply a sealer to fill in the traces left by the bottom layer after sanding to obtain a satisfactory flat bottom layer. At present, the original coating of the new car generally uses two primers as the intermediate coating. The base material selected for use is similar to the base used for the primer and topcoat, thus ensuring a strong bond and good fit to the top and bottom coatings. The two intermediate coatings mainly use polyester resin, amino resin, epoxy resin, polyurethane resin and binder resin as the base material; pigments and fillers are selected from titanium white, carbon black, barium sulfate, talc powder, fumed silica and the like. The two-way intermediate coating has a high solid content and can produce a sufficient film thickness (about 40 um); good mechanical properties, especially good stone-resistance; in addition, it has a smooth surface, smoothness, good sandability, corrosion resistance, Excellent water resistance and other characteristics play an important role in the appearance and performance of the entire paint film.
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