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    Home > Coatings News > Paints and Coatings Market > Coating knowledge: how to choose fillers in coating formulation system

    Coating knowledge: how to choose fillers in coating formulation system

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: the selection of coating filler, because latex paint has the characteristics of small smell, convenient construction, rapid drying, safety and environmental protection, has been rapid and vigorous development With the development of latex paint technology, the technology of emulsion, auxiliaries and pigment is becoming more and more mature in China But the choice of filler is not very sophisticated, relatively few studies At the same time, because some small and medium-sized coating enterprises in China are relatively weak in production technology strength and lack of knowledge about the application technology of filler, many enterprises have chosen high-quality emulsion Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: the selection of paint filler, because latex paint has the characteristics of small smell, convenient construction, rapid drying, safety and environmental protection, has been rapid and fierce development With the development of latex paint technology, the technology of emulsion, auxiliaries and pigment is becoming more and more mature in China However, the choice of filler is not very sophisticated, relatively little research At the same time, because some domestic small and medium-sized coating enterprises have relatively weak production technology strength and lack of knowledge about the application technology of filler, many enterprises have chosen high-quality emulsion According to the present situation of using filler in latex paint production, how to choose filler correctly and reasonably is briefly discussed 1 There are many kinds of fillers commonly used in latex paint and their characteristics The commonly used fillers are heavy calcium carbonate, light calcium carbonate, talcum powder, wollastonite powder, sericite powder (mica powder), precipitated barium sulfate, bentonite, lime calcium powder, ultra-fine aluminum silicate, quartz powder, etc 1.1 there are two kinds of calcium carbonate: natural and synthetic The former is heavy calcium carbonate (referred to as heavy calcium) and the latter is light calcium carbonate (referred to as light calcium) Heavy calcium, also known as white powder, Shuangfei powder and calcite, is insoluble in water, soluble in acid, dense and easy to precipitate, with low product cost At the same time, it can be used in latex system to improve color retention, with a little dry coverage, and easy to start white frost Light calcium is a kind of lime milk which is made of limestone after high temperature calcination, and then it is obtained by CO 2 gas and precipitation drying It is characterized by small density and fine particles, which can improve the color retention and suspension in latex paint, with a little dry coverage, and its disadvantage is easy to frost 1.2 talcum powder talcum powder is a kind of inorganic salt containing magnesium silicate salt It is produced by crushing natural talcum Talcum powder belongs to hexagonal rhombus plate crystal flake structure and has a sense of greasiness When used in latex paint, it can improve the workability and leveling of the paint, but it is easy to be powdered 1.3 wollastonite powder the main component of wollastonite powder is CaSiO3, and the product is in needle, rod or refractive fiber structure When used in emulsion paint, it can make the white paint have bright color and partial dry covering power, at the same time, it can improve the wear resistance and durability of the paint film, and enhance the hardness of the paint film 1.4 calcined kaolin kaolin is a clay with kaolinite as the main component Its main component is: Al2O3 · 2SiO2 · 2H2O, which is soft and easy to disperse in water Calcined kaolin is one of the functional fillers appearing in recent years Its characteristics are high whiteness, good dispersion and strong covering power The application of titanium dioxide can improve the comprehensive effect of the coating 1.5 sericite powder sericite powder is a kind of fine-grained muscovite, which belongs to layered silicate and its crystal is scaly It is elastic, bendable, acid and alkali resistant and has good chemical stability It is an important functional filler in recent years that it can greatly improve the weatherability of paint film, prevent water vapor penetration, prevent cracking, delay pulverization, etc With the improvement of processing technology and application technology of non-metallic materials in China, many fillers have been produced Reasonable application of fillers can improve the performance of coatings The following is a brief comparison of the properties of several commonly used fillers and their functions in coatings 2 The selection of fillers in emulsion paint the reasonable selection of the type and specification of fillers in emulsion paint can greatly improve the quality of the paint, if not, it will bring unnecessary troubles 2.1 according to the application scope of the coating, different types of emulsion paint are divided into interior wall paint and exterior wall paint Generally, fillers with good weather resistance and not easy to be powdered are selected in the exterior wall paint Sericite, barium sulfate, wollastonite, calcined kaolin, etc are recommended to be used, and light calcium, light calcium, talcum powder, kaolin and other products with high whiteness are recommended to be used in the interior wall paint, At the same time, ultrafine powder was used Table 1 shows the product performance comparison of several conventional fillers 2.2 according to the variety of fillers used, fillers with different fineness, such as heavy calcium, barium sulfate, talcum powder, calcined kaolin, etc are selected to be used in the coating One angle plays the role of physical filling, and the other angle has a certain dry covering power It is generally recommended to use ultra-fine products Because of the synergistic effect of fillers on the covering power of titanium dioxide, when the particle size of the powder reaches the microminiaturization level, When the particle size of titanium dioxide pigment is close to that of the matched titanium dioxide pigment, the covering effect of titanium dioxide can be improved, and the strength and water resistance of the paint film can be improved at the same time Wollastonite and sericite are used to improve the strength, weatherability and water resistance of the paint film It is generally recommended to use products of 800 mesh or so For example, when considering the effect of the paint film, products of 1250 mesh or so can be adopted Products of 2000 mesh or more are generally not recommended 2.3 according to the CPVC concentration requirements, the different critical pigment volume concentration (CPVC) of fillers refers to the pigment volume concentration when the base material just covers the surface of pigment particles and fills the accumulation space of pigment particles The higher the fineness of fillers, the larger the specific surface area and the higher the oil absorption value, the smaller CPVC will be Generally, the PVC of latex paint formula is not more than CPVC, otherwise it will affect many physical properties of paint film With the increasingly fierce market competition of latex paint, in order to reduce costs and enhance competitive advantage, the development of high PVC latex paint has become an important research topic for latex paint manufacturers As like as two peas of PVC as like as two peas, the CPVC value of the product is not exactly the same because of the different raw materials and ratios Therefore, to make latex paint have high PVC value, its quality can meet the national standards, the core is to make latex paint have high CPVC, so as to minimize the gap between PVC and CPVC value In the design of paint formulation, ultra-fine fillers are used for high-performance latex paint, while fillers with relatively coarse particle size and low oil absorption value, such as heavy calcium and barite, are used for low-grade latex paint 3 There are many kinds and specifications of fillers under the control of fillers' index Compared with confusion, the quality of latex coating can be guaranteed by selecting high-quality and stable products The indexes to be considered in the application of fillers for latex paint are: product purity, whiteness, particle size, 325 mesh screen residue, pH value and oil absorption Purity is one of the most important indexes of products, and functional filler is particularly important High quality talcum powder can improve the construction performance and leveling of emulsion paint; high-purity wollastonite can greatly improve the strength of the paint film; lamellar sericite is superimposed in the film layer by layer to improve the strength and water resistance of the paint film; meanwhile, it has a unique UV shielding function to improve the weather resistance of the paint For talcum powder and wollastonite filler, the SiO2 index is used to determine, and the higher the SiO2 content, the purer the product; for sericite, kaolin and other aluminum silicate filler, the SiO2 and Al2O3 indexes are used to control; for calcium carbonate, the CaCO3 content is used to determine Whiteness is one of the basis for customers to choose fillers, especially for fillers such as heavy calcium, light calcium, kaolin, etc which use dry covering power; at the same time, the color phase of fillers should be considered, and the cyan phase is the best In the market, the grain size is generally determined by the number of mesh This method is not very scientific At the same time, some manufacturers use low mesh to fill high mesh products It is generally recommended that customers should provide the grain size distribution map when selecting raw materials and products, and it is more valuable to determine the median grain size For the selection of functional fillers, it is also necessary to know the production process of the product For example, the performance differences of kaolin products produced by coal burning and electric burning processes are very large, and the performance differences of Sericite products produced by dry and wet processes are also very large When selecting fillers, customers must strengthen the understanding of index control on manufacturers, control the batch stability of raw materials, and suggest not to change the product specifications and manufacturers at will 4 With the continuous improvement of the R & D level of latex paint, consumers have higher requirements for product functions The high performance and multi-function of latex paint has become the development trend of the paint industry For example, the interior wall latex paint is environmentally friendly, non-toxic, anti-bacterial and anti mildew; the exterior wall paint is aging resistant and self-cleaning The traditional fillers play a role of skeleton structure in the coating, but have little effect on improving the function of the coating In recent years, some latex paint manufacturers at home and abroad have begun to study some functional fillers to improve or endow the paint with new functions, and achieved some results Due to the difference of chemical composition and crystal structure, the processing technology of functional filler is different from that of application technology Through the improvement of processing technology, the characteristics of filler can be improved or new functions can be given to emulsion paint It mainly represents the contribution of flake sericite powder to the weatherability of the coating, the improvement of storage stability of the coating by adsorption filler, the improvement of antibacterial and weatherability of the coating by nano filler and the wide application of some new functional fillers The flake sericite powder has the crystal polarization effect and the light interference effect of crystal water between layers, which has a strong absorption and shielding effect on ultraviolet rays In the latex paint, the product can not only improve the mechanical properties of the coating, but also improve the anti-aging and anti UV properties of the coating, prevent cracking, delay the pulverization, and at the same time, the color of the sustainable coating will not fade for a long time Nano filler is generally prepared by synthetic processing, or non-metallic powder processing with nano structure, such as nano calcium carbonate, nano ZnO, etc., is applied in the coating system, which can make the coating have antibacterial and anti mildew effects, at the same time, improve the weather resistance of the coating film, and greatly improve the comprehensive quality of the coating material 5 Conclusion: latex paint products are developing rapidly, but the competition is becoming increasingly fierce How to be invincible in the market? Quality and cost is an eternal theme The cost and quality of coatings are closely related to the choice of raw materials They should not only focus on emulsion, titanium dioxide and auxiliaries, but also strengthen the selection and control of fillers Fillers account for 20% - 40% of latex paint ingredients High quality and stable fillers are the guarantee of producing high-quality products With the deepening of coating technology research, hanergy chemical will have more and more new functional materials to be used in the coating system The home of coatings is focused on coatings, diatom mud, paint coating, coating technology, fire-resistant coating news and coating, diatom mud, paint coating, Coating technology, decoration knowledge and decoration effect drawing of fireproof coating,
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