Coating classification: lithopone

It is suggested that lithopone chemical formula ZnS · BaSO4, also known as lithopone, white crystalline powder, is a mixture of zinc sulfide and barium sulfate Lithopone is a better white pigment, the covering power is next to titanium dioxide, the whiteness is high The disadvantage is that the color will darken after long exposure to sunlight The more zinc sulfide, the stronger the covering power and the higher the quality The density is 4.136-4.34 g / cm3, insoluble in water Lithopone is easy to decompose in the presence of acid to produce hydrogen sulfide gas, which will not work in the presence of hydrogen sulfide and alkali solution Become light gray after 6-7h exposure to ultraviolet light in sunlight 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 Home of coatings: lithopone chemical formula ZnS · BaSO4, also known as lithopone, white crystalline powder, is a mixture of zinc sulfide and barium sulfate Lithopone is a better white pigment, the covering power is next to titanium dioxide, the whiteness is high The disadvantage is that the color will darken after long exposure to sunlight The more zinc sulfide, the stronger the covering power and the higher the quality The density is 4.136-4.34g/cm3, insoluble in water Lithopone is easy to decompose in the presence of acid to produce hydrogen sulfide gas, which will not work in the presence of hydrogen sulfide and alkali solution When exposed to ultraviolet light in the sun for 6-7 hours, it turns light gray, and it still returns to its original color when placed in the dark It is easy to oxidize in the air and agglomerate and deteriorate after being affected with moisture The physical characteristics of lithopone 1 The relative density of lithopone is the smallest among the commonly used white pigments, and the surface area of titanium dioxide is the largest and the volume of pigment is the highest among the white pigments of the same quality 2 The melting point and boiling point of anatase titanium dioxide are virtually nonexistent because the anatase will change into rutile at high temperature Only rutile titanium dioxide has melting point and boiling point The melting point of rutile titanium dioxide is 1850 ℃, the melting point in air is (1830 ± 15) ℃, and the melting point in oxygen enriched is 1879 ℃ The melting point is related to the purity of titanium dioxide The boiling point of rutile titanium dioxide is (3200 ± 300) ℃, and titanium dioxide is slightly volatile at this high temperature 3 Due to the high dielectric constant of titanium dioxide, it has excellent electrical properties In the determination of some physical properties of titanium dioxide, the crystal direction of titanium dioxide crystal should be considered The dielectric constant of anatase titanium dioxide is relatively low, only 48 4 The conductivity of titanium dioxide has the properties of semiconductor, its conductivity increases rapidly with the rise of temperature, and it is also very sensitive to hypoxia The dielectric constant and semiconductor properties of rutile titanium dioxide are very important to the electronic industry, which can be used to produce electronic components such as ceramic capacitors 5 According to the scale of Mohs hardness, rutile titanium dioxide is 6-6.5, anatase titanium dioxide is 5.5-6.0 Therefore, anatase titanium dioxide is used to avoid abrasion of spinneret holes in chemical fiber extinction 6 Although hygroscopic titanium dioxide has hydrophilicity, its hygroscopicity is not very strong, and rutile type is smaller than sharp titanium type The hygroscopicity of titanium dioxide is related to its surface area The surface area is large and hygroscopicity is high 7 Thermal stability titanium dioxide is a kind of material with good thermal stability 8 The particle size distribution of lithopone is a comprehensive index, which seriously affects the performance of lithopone pigment and the application performance of the product Therefore, the discussion of covering power and dispersibility can be directly analyzed from the particle size distribution Lithopone is used for coloring paint, ink, rubber, etc Inorganic white pigment is widely used in polyolefin, vinyl resin, ABS resin, polystyrene, polycarbonate, nylon, POM and other plastics, paints and inks In polyurethane and amino resin, the effect is poor, but not suitable in fluoroplastics It is also used for coloring rubber products, papermaking, lacquer cloth, oilcloth, leather, watercolor pigment, paper, enamel, etc It is used as an adhesive in the production of electric beads Lithopone standard GB / t1707-2012 this standard specifies the product classification, requirements, test methods, inspection rules, marks, packaging and storage of lithopone This standard is applicable to the white pigment produced by calcining the coprecipitation of zinc sulfide and barium sulfate with similar molecular ratio Products are mainly used in coating, ink, rubber and plastic industries This standard is drafted according to the rules given in GB / t1.1-2009 This standard substitutes for lithopone (GB / t1707-1995) Compared with GB / t1707-1995, the main technical changes are as follows, except for editorial modification: - "C201" product varieties and corresponding technical requirements are added (see Chapter 3 and Chapter 4); - - according to the different content of zinc sulfide in this standard, the products are divided into 20% lithopone and 30% lithopone; the corresponding varieties of 20% lithopone are C201; 30% lithopone can be divided into four varieties according to the different surface treatment methods: B301, b302, B311 and b312 In the previous edition of GB / t1707-1995, the products are divided into four varieties (B301, b302, B311 and b312), each of which is divided into three grades (superior, first-class and qualified products) (see Chapter 3, Chapter 3 of 1995 edition); - in this standard, the requirements for the acidity and alkalinity of the color and water extraction solution are "close to the agreed reference pigment", and the requirements for the achromatic power, covering power and oil absorption are "agreed", The specific requirements for other items are specified according to varieties All items in the previous version of GB / t1707-1995 are specified according to varieties and grades (see Chapter 4, Chapter 4 of 1995 version); -- agreed reference pigments are used for determination of color and achromatic power, and selected national standard samples are used in GB / t1707-1995 (see Chapter 4, Chapter 4 of 1995 version); ——- Method B for the determination of total zinc content (Na2EDTA titration method) (see 6.1.3); - Test Method for the determination of color by instrumental method (see 6.6.3); - informative Appendix A (see Appendix A) is added This standard adopts redrafting method to modify and adopt international standard iso473:1982 specification and test method of lithopone pigments for paints There are technical differences between this standard and iso473:1982 The clauses involved in these differences have been marked by the vertical single line (︱) in the blank position on the outside of the standard A list of corresponding technical differences and their causes is given in Appendix A The following editorial changes have also been made to the standard: -- the name of the standard has been changed ——- the "foreword" and "Chapter 8 test report" of the international standard are deleted This standard is proposed by China Petroleum and Chemical Industry Federation This standard is under the jurisdiction of SAC / TC5 This standard is drafted by CNOOC Changzhou paint Chemical Research Institute, Hunan entry exit inspection and Quarantine Bureau, Hunan Jingyan Chemical Co., Ltd and Xiangtan Hongyan Chemical Co., Ltd Main drafters of this standard: Xiao Jiayong, Huang Yidong, Chen Yong, Chen Xinhuan, Zhou Jianguang, Xiao Fengxi The previous editions of the standards replaced by this standard are: GB / t1707-1979, GB / t1707-1986 and GB / t1707-1995 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,