echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Coatings News > Paints and Coatings Market > General knowledge of coating: basic principle of water-based color paste processing

    General knowledge of coating: basic principle of water-based color paste processing

    • 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
    It is suggested that water-based color paste is a kind of concentrated pigment paste with water as the dispersing medium It can fully wet and disperse the pigment through dispersant, wetting agent, stabilizer and other functional agents, so as to optimize the application performance of pigment and stabilize the system effect It mainly uses the principle of electrostatic shielding and space resistance to disperse and stabilize the pigment particles The basic principle of color paste processing: the mechanism of pigment dispersion and wetting stability is: the correct use of dispersion and wetting AIDS, reducing the interfacial tension between pigment and system, is to fully decompose and flocculate pigment, so as to effectively improve the application performance of pigment General inorganic pigment 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 Paint Home News: water-based color paste is a kind of concentrated pigment paste with water as the dispersing medium It makes the pigment fully wet and disperse through dispersant, wetting agent, stabilizer and other functional agents, so as to optimize the application performance of pigment and stabilize the system effect It mainly uses the principle of electrostatic shielding and steric hindrance to disperse and stabilize the pigment particles The basic principle of color paste processing: the mechanism of pigment dispersion and wetting stability is: the correct use of dispersion and wetting AIDS, reducing the interfacial tension between pigment and system, is to fully decompose and flocculate pigment, so as to effectively improve the application performance of pigment Generally, inorganic pigment is dispersed with ionic auxiliaries, which have high surface polarity and are easy to adsorb For the dispersion of organic pigments, non-ionic polymer additives are often used Organic pigment has a non-polar surface, so it is difficult to adsorb conventional auxiliaries Polymer auxiliaries have the characteristics of resin, and have many adsorption groups, which can form an adsorption layer on the surface of organic pigment particles Through the space shielding effect of polymer chain, the stabilization effect is produced, as shown below ① Dispersing and wetting auxiliaries can remove the adsorbed air and moisture from the surface of pigment, and change from the original solid / gas interface (pigment particles / air or moisture) to the solid / liquid interface (pigment particles / auxiliaries or system solvents, water) ② In the process of pigment grinding, the pigment particles are dispersed by mechanical energy (shear force and impact force), and the auxiliary molecules are fully wetted to form a finer pigment dispersion The size and strength distribution of pigment dispersion have great influence on the application performance of water-based color paste, such as color light, brightness, dispersion, light resistance and special thin paint requirements ③ The special anionic dispersant assistant is used to enhance the surface charge of pigment particles, and the pigment dispersion is stabilized by the principle of the same charge repulsion Under the electrostatic shielding, each pigment particle is surrounded by a double-layer ion charge A pigment particle adsorbs a negative ion and is then surrounded by a positive ion When the two pigment particles are close to each other, the Coulomb repulsive force is dominant, thus changing their trajectory to avoid closer 4 A large number of hydrocarbon chain segments (dispersant chains) extend from the surface of pigment particles to the surrounding area Through this thick adsorption layer (generally greater than 10nm), a space steric hindrance is formed to prevent the close contact between pigment particles and form A protective film "shell", this film shell structure can not only improve the performance of pigment, but also effectively reduce the adsorption between pigment dispersion and improve the stability of color paste The steric mechanism can play a role in polar (such as water) and nonpolar (such as petroleum ether) solvents In the presence of electrolyte, the particles of pigment dispersion will be larger, the particle distribution will be uneven, and the dispersion will be poor The larger the valence electron is, the greater the influence of the ions will be With the decrease of the valence number of the valence electron ions, the influence will be smaller This may be because the multivalent ions compress the thickness of the double electron layer on the surface of the micelle, reduce the charge of the micelle, and reduce the repulsive force between the particles, so as to disperse Sex declined Therefore, the presence of dielectrics in the color paste system will greatly affect the particle size and dispersion of pigment dispersion 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.