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    Home > Coatings News > Paints and Coatings Market > General knowledge of coating: the effect of Diatomite on the performance of styrene acrylic interior wall coating

    General knowledge of coating: the effect of Diatomite on the performance of styrene acrylic interior wall coating

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tips: Information With the continuous improvement of people's requirements for building comfort and health, especially in the cold north, more and more attention has been paid to the thermal insulation and airtightness of the building itself Therefore, a large number of new building materials are used in the building or air conditioners are used indoors to create comfortable living space, resulting in many indoor environmental problems, such as the building caused by the difficulty of exhausting outdoor moisture Building materials are mildewed and deteriorated; building materials and furniture are dried, cracked and deformed due to indoor dry air Therefore, a kind of adjustable humidity interior wall coating will play an important role in improving indoor environment Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: with the continuous improvement of people's requirements for building comfort and health, especially in the cold north, the heat insulation and sealing of the building itself are increasingly valued, so a large number of new building materials are used in the building or air conditioning is used indoors In order to create comfortable living space, many indoor environmental problems are produced as a result, such as mildew and deterioration of building materials caused by outdoor humidity, cracks and deformation of building materials and furniture caused by indoor dry air, etc Therefore, a kind of adjustable humidity interior wall coating will play an important role in improving indoor environment The density of diatomite is very small, only 0.4-0.9g/cm3, it can float on the water surface, and it also has remarkable porous characteristics There are numerous 0.1-0.2 μ m micro pores on its surface, and the number of micro pores on the unit area of particles is thousands of times higher than that of charcoal, so it has very high adsorption capacity The surface of diatomite is covered by a large number of silicon hydroxyl groups, and there are hydrogen bonds Hydroxyl groups are also distributed on the inner surface of diatomite pores These hydroxyl groups are the essential reason for the surface activity and adsorption of diatomite Adding diatomite as filler to interior wall coating can not only reduce the cost, but also have the function of dehumidification and deodorization for indoor air, which can obviously improve the indoor living environment In this experiment, the effects of the particle size and the amount of Diatomite on the flexibility, impact resistance and appearance of the film were studied, and the effects of Diatomite on the moisture absorption and desorption properties of the styrene acrylic interior wall coating and the improvement of the properties were emphatically discussed 1 experimental part 1.1 experimental raw materials Hydroxyethyl cellulose, dispersant, wetting agent, fungicides, multifunctional additives, defoamer, film builder, styrene acrylic emulsion, thickening agent, leveling agent and diatomite are all industrial grade and commercially available Titanium dioxide: Panzhihua Tianlun Chemical Co., Ltd.; kaolin: Tangshan Madison kaolin Co., Ltd.; talc powder: Haicheng Tashan light burned magnesia plant; heavy calcium carbonate: Quanxing mine Industrial Co., Ltd.; glycol: analytically pure, commercially available 1.2 multi purpose disperser for experiment instrument and equipment test: sdf400, Shanghai Weite Motor Co., Ltd.; electronic balance: jy10001, Shanghai Minqiao quiet Scientific Instrument Co., Ltd.; film impactor: cjq - Ⅱ, Shanghai Pushen Chemical Machinery Co., Ltd.; film cone bending tester: ZQ - Ⅱ, Shanghai Huiqun mechanical and electrical equipment Co., Ltd; Laser particle size analyzer: rise-2002, Jinan Runzhi Technology Co., Ltd.; scanning electron microscope: s-4800, Hitachi Manufacturing Co., Ltd.; moisture absorption and desorption evaluation system: self-made; multi-functional video microscope: xtl-1, Nanjing Jiangnan photoelectric metallographic microscope 1.3 coating preparation process (1) a certain amount of hydroxyethyl cellulose is added into the water under the low-speed mixing state of the mixer, and then the dispersant, wetting agent and other additives are added in turn according to a certain proportion for mixing; (2) under the mixing state, titanium dioxide, diatomite and other pigments and fillers are added in proportion, and the thick slurry is formed after 30 minutes of high-speed dispersion; (3) adding a certain amount of styrene acrylic emulsion and film forming auxiliaries to the medium and low speed stirring slurry, stirring evenly and discharging 1.4 a certain specification of tinplate shall be selected for the preparation of the coating, the surface shall be cleaned, brushed evenly with the brush method, and dried to form the film at room temperature 1.5 performance test and characterization 1.5.1 film appearance use multi-functional video microscope to observe the dried film appearance and capture photos 1.5.2 the flexibility of the coating is tested by the ZQ Ⅱ cone bending tester, in which the mandrel is a cone with a length of 200 mm and a diameter extending from the maximum of 38 mm to the minimum of 3 mm After the test plate is inserted and fixed, turn the upper handle to make the test plate close to the surface of the cone to flex Observe the minimum diameter that causes the coating damage, which represents the flexibility of the coating 1.5.3 impact resistance test of coating film impact resistance test shall be conducted according to GB / t1732-1993 1.5.4 moisture absorption and desorption performance test of diatomite and related coating shall be conducted in accordance with JC / t2002-2009 2 results and discussion 2.1 influence of diatomite particle size on coating performance 2.1.1 analysis of diatomite particle size due to the presence of impurities in diatomite, considering the influence of impurities on the moisture absorption and desorption of diatomite coating, therefore, the diatomite screening is divided into different particle sizes for analysis From the screening of diatomite, when the particle size is less than 75 mesh, part of the screened diatomite is black impurity, and the smaller the particle size is, the less the diatomite impurity is, and the color of the diatomite tends to white Four kinds of diatomaceous earth with different particle size range from 75 to 100 mesh, 100 to 200 mesh, 200 to 300 mesh and original soil samples were selected for analysis SEM scanning electron microscope analysis was carried out for these four kinds of diatomaceous earth with different particle size range, and the results are shown in Figure 1 Fig 1 SEM photos of internal pore structure of diatomite with different particle sizes from Fig 1, it can be seen that there are different pore sizes in different particle sizes of diatomite, the pore size is 100-500nm, so it can be seen that there is no direct relationship between particle size and pore size 2.1.2 comparison of moisture absorption and desorption performance of diatomite with different particle sizes the moisture absorption and desorption performance of diatomite is closely related to its physical structure and chemical structure Generally speaking, the size of specific surface area is directly proportional to the amount of adsorption; and the size of diatomite pore diameter is also directly proportional to the diffusion rate of adsorbate in the pore As shown in Table 1, the moisture absorption and desorption performance of diatomite in different particle size ranges are also different Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,
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