Shanghai liefan decoration materials Co., Ltd.: in recent years, aluminum alloy aluminum door and window hanging plate is widely used in high-grade building exterior wall decoration for its luxurious and solemn decoration effect and excellent weather resistance. However, the high cost and complex construction of aluminum alloy doors and windows limit its popularization and application. Imitation aluminum alloy door and window coating is made in the outer wall, with matching putty scraping, grinding, polishing, and then spraying fluorine resin coating or polyurethane coating or silicone acrylate coating
The organic polymer binders for putty are polyvinyl alcohol acetal glue, polyvinyl acetate emulsion, pure acrylic emulsion, styrene acrylic emulsion, etc
Considering the bonding strength, workability and surface state, the crosslinked styrene acrylic emulsion was selected as the organic polymer binder.
Shanghai liefan decoration materials Co., Ltd.: what advantages does filler have?
In addition to reducing the cost of putty, fillers can also reduce the curing shrinkage of the coating, eliminate internal stress, and improve the hardness and scratch resistance of the coating. However, the impact resistance, flexibility and crack resistance of the film may be reduced by adding too much filler. The performance of putty is not only related to the amount of filler, but also to the variety, structure, particle shape and particle size of filler. The commonly used fillers are quartz sand, talcum powder, heavy calcium carbonate, barium carbonate, etc. However, its water resistance and weather resistance are not ideal. Talc powder can give the film smoothness and light retention, and has good adhesion and grindability, but its water resistance and crack resistance are not ideal. Quartz sand has high strength, better water resistance, weather resistance and crack resistance than ordinary fillers, but its price is higher.
Shanghai liefan decoration materials Co., Ltd.: according to the different performance requirements of each putty, select fillers with different particle sizes and proportions to prepare the required putty.
Shanghai liefan decoration materials Co., Ltd.: what are the quality requirements of the primer?
The primer can enhance the putty and protect the surface paint. Because of the porous structure on the surface of the base material, it has a strong water absorption. If the primer is not applied for sealing, the putty will lose water too quickly. As an inorganic binder, the cement does not have enough time to hydration, which will greatly affect the adhesion of putty. The low strength of putty layer is the main reason for cracking, blistering and peeling of exterior wall coating. The primer can effectively avoid the occurrence of such coating quality accidents. Because of the strong penetration of the primer, it can seal the pores of the base material, so as to avoid the alkali content and water-soluble salt in the base material from seeping out of the surface with the migration of water through capillary action, prevent frost and efflorescence, and protect the top coat from chemical erosion. At the same time, it can avoid the excessive absorption of the porous base material, improve the decorative effect of the top coat, and save the amount of topcoat.
It has the advantages of strong solvent resistance, good solvent resistance, good water resistance. The primer is composed of resin, solvent and additives. Its performance depends on the type of resin used and solid content. The commonly used resins for primer are thermoplastic acrylic resin, amine cured epoxy resin, acrylic polyurethane, silicone resin and chlorinated rubber resin. Acrylic primer has good permeability, but poor solvent resistance, easy to undercut; silicone primer has good alkali resistance and water resistance, but will affect the adhesion; epoxy primer has strong alkali resistance, good adhesion, but poor weather resistance.