echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Coatings News > Paints and Coatings Market > Coating standard: application performance test of titanium dioxide

    Coating standard: application performance test of titanium dioxide

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    Core tip: titanium dioxide is an important white pigment The current national standard does not regulate the application performance index test of titanium dioxide The following is the application performance test of titanium dioxide in the main application fields of coating and plastic industry, mainly about the application performance test of titanium dioxide in plastic industry According to the testing standards of plastic industry, a testing method for titanium dioxide application index applied in plastic industry is formed to provide simple and accurate test results of product application performance for titanium dioxide production enterprises, so as to provide basis for enterprises to determine the product sales direction Titanium dioxide is an important inorganic chemical raw material, non-toxic Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings: titanium dioxide is an important white pigment The current national standard does not regulate the application performance index test of titanium dioxide The following is the application performance test of titanium dioxide in the main application fields of coating and plastic industry, mainly about the application performance test of titanium dioxide in the plastic industry According to the testing standards of plastic industry, a testing method for titanium dioxide application index applied in plastic industry is formed to provide simple and accurate test results of product application performance for titanium dioxide production enterprises, so as to provide basis for enterprises to determine the product sales direction Titanium dioxide is an important inorganic chemical raw material, which is non-toxic and harmless to health It is the most important white pigment, accounting for 80% of the total use of white pigment It is also the most important product of titanium series 90% of the world's titanium resources are used to manufacture titanium dioxide, which is the third largest inorganic chemical after synthetic ammonia and phosphorus chemical industry (in terms of value) Many developed countries have included titanium dioxide in the list of key chemicals In some countries and regions, its consumption is directly proportional to GNP, and even takes the consumption of titanium dioxide as one of the important criteria to measure the economic development and people's living standards of a country Titanium dioxide has the highest refractive index among known white pigments (rutile 2.71, anatase 2.55), high opacity, excellent optical properties and pigment properties, so it is widely used in coating, ink, plastic, rubber, paper making, chemical fiber and cosmetics industries The national standard GB / T 1706-2006 stipulates the corresponding testing standards for the basic indicators of titanium dioxide These indicators are only suitable for the quality control of titanium dioxide production enterprises on the production link, but can not truly reflect the application performance of titanium dioxide products in different industries Therefore, starting from the main application fields of titanium dioxide, coating and plastic industry, this paper analyzes the application performance of titanium dioxide in these two industries and the required test indexes and index requirements, which can be used for the analysis and research of titanium dioxide production peers, so as to further improve the application performance of domestic titanium dioxide products Titanium dioxide pigment for plastic coloring, such as the current standard or the index for ink, coating, etc., is not enough for plastic coloring The processability and application needs of products, such as heat resistance, weather resistance, and interaction with polymers or additives, should be considered In this paper, the test indexes of application performance of colored titanium dioxide pigment for plastics are detailed as follows 1.1 whiteness is one of the most important characteristics of commercial titanium dioxide Whiteness is based on the visual perception to judge the "whiteness" of the reflected object Theoretically, in the electromagnetic radiation range, only the radiation with wavelengths of 380nm to 780nm can cause people's visual sensation This light wave is called visible light In fact, the different colors of the objects we see in ordinary times are formed after the objects absorb and reflect the light waves of different wavelengths in the visible light to different degrees That is to say, the different absorption and reflection degree of the visible light of the substance forms the colorful color When all the light in the visible range is diffused equally, there is no light absorption, and only light scattering, the object appears pure white, which is called the most white matter in theory As titanium dioxide is a white pigment, no matter where it is used, the requirements for its own white are the same, so the detection of whiteness is also a relative concept, just use a colorimeter in the same dispersion medium to compare the color difference between the dispersed sample and the standard sample In the whiteness test of plastics, the same quality sample and standard sample can be prepared into color masterbatch first according to the same mixing and plasticizing process, then the same dilution ratio can be used to inject into the block test plate, and then the corrected color difference meter can be used to test the color difference between the sample and standard sample For the detection of this index, please refer to the national standard "GB / T 2913-1982 plastic whiteness test method", uniformly make the sample and standard sample into the same concentration of block type test plate, and then conduct the detection 1.2 particle size and particle size distribution refers to the size of a particle For regular spherical particles, we can use "diameter" to accurately describe its size In actual production, due to the instability of control, in most cases, the particle shape is not spherical and cannot be expressed by diameter Therefore, the concept of "particle size" is introduced to represent the size of particles The so-called particle size can be understood as one-dimensional size For the same particle, due to the different application occasions, the measurement methods are often different, and the particle size value obtained is also different; what is seen under the microscope is the projection size on the vertical plane of the particle and the line of sight; the particle size obtained by the screening method is the size of the sieve hole; the diameter of a certain spherical particle with the same settling characteristics is obtained by the settling measurement method In production practice, it is often not a single particle size, but a collection of several particles with different particle sizes, that is, particle groups How to describe all particle size characteristics of particle groups has become a problem At present, the average particle size of the particle group is generally calculated by the method of statistical mathematics, and then the particle size and distribution are described in sections, that is, the particle size distribution, that is, the particle content of different particle size ranges in the pigment powder The titanium dioxide we see is composed of a single crystal with a diameter of 0.1-0.3 μ m, no matter it is anatase or rutile The size of a single crystal particle, the binding force and the binding amount of the secondary particles from the aggregation will lead to great changes in the whiteness, achromatic force, dispersion, weather resistance and other pigment properties of the titanium dioxide dispersion system Therefore, the particle size and particle size distribution is one of the important properties that affect the performance and application index of pigments, and it has a decisive influence on almost all the properties of pigments Because the particle size and shape have a great influence on the properties and uses of the products, different measurement methods are suitable for different particle size ranges, because different principles are adopted, the test results of the same sample will have deviation in the data At present, the commonly used analysis methods in the factory include electron microscope photo, centrifugal sedimentation analysis, laser particle size analysis, specific surface area method Because different instruments choose different physical properties of the same particle as the reference when they are equivalent, the results may be different when they are used to measure the same irregular particle Sometimes even the instruments of the same principle have different test conditions and different results Therefore, when comparing the size and distribution of particles of two materials, it is necessary to agree with the test method to have comparability Because of the special hydrophobic treatment on the surface of titanium dioxide for plastics, the dispersing method of the sample must be selected first when using the centrifugal sedimentation analysis or laser particle size analyzer Only when the sample is fully dispersed, can the result be as accurate as possible In this way, there is bound to be a difference between the standard sample and the sample dispersing method, so the two methods are not suitable It can be used for particle size detection of titanium dioxide for plastics, and the most suitable method is electron microscope analysis method, which can get the results of particle size and particle size distribution more intuitively by throwing away the influence of sample dispersion At the same time, it can also get the image of particle morphology, which provides a good basis for analyzing the application characteristics of titanium dioxide in plastics This method can refer to "GB / T 21649.1-2008 particle size analysis image analysis method Part 1: static image analysis method" 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,
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.