Mineral filler in the application of exterior wall paint, interior wall paint, 2)

3. Paint is commonly used in packing type is commonly used in coatings fillers including calcium carbonate ( The coarse whiting and light calcium) , barite powder ( Barium sulfate) , talcum powder, kaolin, China clay) Porous powder, timely, Silica) , white carbon black, precipitated barium sulfate, mica powder, wollastonite, bentonite, etc. 1. Calcium carbonate, calcium carbonate is an important packing in paint production. Calcium carbonate (ACTS as a frame in the paint film and substrate Steel and wood) The bridge between, in order to enhance film deposition and permeability. Particularly applicable to metal antirust primer, and the metal surface to form hydrogen bonding, increase the film adhesion, and can absorb hydrogen ions, tend to prevent the formation of microporous metal corrosion. In addition, the surface of calcium carbonate with good weather resistance, abrasion resistance, low content of electrolyte, ph stability effect, can improve the corrosion resistance of coatings and rheological properties. Coarse levels of calcium carbonate is limited to products such as putty, hole filling agent, metal primer, require high pigment content, good liquidity and rough surface. Intermediate calcium carbonate used in architectural coatings and indoor matte or gloss paint. Fine calcium carbonate is mainly the precipitation of calcium carbonate, used in printing ink. Coarse whiting can be used in a variety of internal and external coating, the most suitable for water-based coating. Acid resistance difference hindered its application in exterior wall coating. Paint, coarse whiting addition amount of 10% ~ 35%, and a variety of embossed coating of content as high as 50%. Coating industry use coarse whiting is mainly used to partly replace titanium dioxide ( General for the amount of 10% ~ 20% and 30%) Alternative light and color pigment, calcium and precipitated barium sulfate, anti-corrosion, in addition to the incremental, partly replace antirust paint. Coarse whiting in interior architectural coatings can be used alone, also can be used mixed with talcum powder. Compared with talcum powder, calcium carbonate can decrease the rate of pulverization, improve light color paint color retention, increase resistance to fungal disease. Compared with the coarse whiting, light calcium particle size small, narrow particle size distribution, high oil absorption, high brightness. For the effect of calcium can be used for maximum extinction. Light calcium and coarse whiting often mix in half a gloss paint, latex paint matte paint and matte. 2. Talc powder is common packing in solvent coatings. Due to the emergence of more fine talcum powder, it has entered the aqueous system. Currently, it is applied to all kinds of primer, intermediate coat, inside and outside traffic coatings, industrial coatings and architectural coatings. Talc fillers because of its soft, low wear resistance, suspended good dispersibility, widely used in the coating industry in China. Lamellar structure of talcum powder has excellent properties of brush, coating of liquidity and smoothness, water resistance and enamel bead impermeability, mainly used for primer and intermediate coat. Fibrous talcum powder has high oil-absorbing resin and the rheological properties of good, and can improve a variety of performance of coatings, such as to prevent sagging in the process of sedimentation in the process of storage and besmear, improve the construction performance and so on. There are several classes with talcum powder coatings industry products such as average particle size of talc powder ( - 325 mesh) , fine talcum powder ( - 20 microns and - 10 μm) , ultrafine talcum powder ( - 5 μm) , chemical pretreatment of talcum powder, etc. Respectively suitable for specific purposes and objectives. Granularity coarser talcum powder used in need some rough paint film, such as interior wall paint primer and stripe in the middle tier; The luster of the ultrafine talcum powder is used to control the semi gloss enamel, consistency, and drooping. Ultrafine talcum powder can improve the coating properties not only, still have space separation ability, can partly replace titanium dioxide pigment, etc. Chemical pretreatment of talcum powder can replace titanium dioxide pigment. The disadvantage of talcum powder is high oil absorption, so when need low oil absorption, must packing and barite powder with low oil absorption. In addition, the wear resistance of talcum powder is not high, when require high wear resistance, should be to join other filler to make up for. Contain other non-metallic mineral talcum powder is not suitable for high weather resistance of external coating, because of the impurity minerals easily with acid ( Such as acid rain) Reaction. Industrial test of commonly used coating kaolin whiteness including superfine kaolin, calcined kaolin, activated kaolin ( The surface modification) And so on. Kaolin can be used for all kinds of paint, but it is mainly used for water based architectural coatings, especially the internal use emulsioni paint. Kaolin in water-based coating has good covering power, can partly replace titanium dioxide pigment. Ultra-fine kaolin can partially replace titanium dioxide, about 10% of the amount of titanium dioxide, can reduce the coating cost, but the paint has a little influence on gloss, hiding power and long storage stability. Calcined kaolin of refractive index from 1. 56 to 1. 62, make up for the deficiency of the original covering power and whiteness. In addition, calcined kaolin can improve the opacity of the coating and coating fastness, and calcination of soil has better than scrubbing resistance and resistance to crushing. Calcined kaolin has been used to replace road sign paint, powder paint, building exterior wall latex paint and other parts of the titanium dioxide. Ultra-fine kaolin and calcined kaolin can replace 15% ~ 20% of exterior wall coating of titanium dioxide. Some kaolin in solvent dilution coating showed poor suspended, but after surface modification treatment of calcined kaolin can overcome these shortcomings.