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Second, the impact of particle size on product quality The main technical parameters in the powder coating industry to measure powder quality are appearance, density, effluent (fluidity), volatile content, screening residue, gelatinization time, repose angle, particle size distribution, flow For example, the properties such as volume resistivity, softening temperature, magnetic content, and curing time are also introduced in some standards. Among the more closely related parameters are particle size distribution, density, effluent, angle of repose, fluidity, and uptake.
The particle size distribution has a great influence on the product quality of powder coating, including appearance, leveling, powder rate, stability, recovery rate and many other aspects. In general, the smaller the particle size of the powder, the better the leveling property when the powder is cured, and the smoother and smoother the appearance, but the powder is too thin and the electrification property is reduced, and the coating efficiency is reduced. Ultrafine powder (particle size <10 μm) is basically Without electricity, too fine powder can increase powder production costs. The rate of powder on the powder depends mainly on how much the powder particles are charged, and the charge of the powder is proportional to the square of the particle size of the powder. Increasing the particle size increases the amount of powder charge and increases the rate of dusting. However, the particle size of the powder particles can not be too large, and the particle size is too large. The gravity of the large particle powder exceeds the aerodynamic force and electrostatic force. The powder coating has already fallen due to the effect of gravity not reaching the surface of the workpiece during the flight, but it will Powder rate decreased. At the same time, if the content of ultrafine powder below 10 μm in the powder is too much, the powder will easily absorb moisture and clump, and the stability will decrease. Powder coating production plants and powder coating coating plants all have the problem of recycling powder coatings. Usually, the recovery rate of ultrafine powder with a particle size of <10 μm is low, and when the particle size of the powder is >10 μm, the recovery rate of powder coatings rapidly increases, and the powder Recovery increases with particle size.
3. Application of laser particle size analyzer in coating industry Jiangsu Chenguang Coatings Co., Ltd. is a national key enterprise of new coating bases specialized in the research and development, production, sales, construction, and technology-related services of green functional high-grade coatings. It is the only high-tech paint company with a postdoctoral workstation in Jiangsu Province. It has a provincial-level nanomaterials application technology research center and has won the title of national contract-abiding credit enterprise, national exemption product, Jiangsu famous brand, and famous trademark.
The company used Winner2000 laser particle size analyzer (Jinan Micron Particle Instruments Co., Ltd.) to control the particle size of the powder, which greatly improved the appearance and leveling of the coating, and the powder coating rate, stability, recovery rate, etc. Have greatly improved. Through the control of the particle size of the powder, the problem of uneven solidification of the coating and occurrence of particles during spraying is effectively solved. At the same time, the particle size of the powder also affects the charged state of the powder. Changing the particle size also effectively changes the powder coating rate. The storage of paint powder is directly related to the quality of the manufactured product. Through analysis and adjustment of the particle size of the powder, the company successfully solved the problem of moisture absorption and agglomeration of the powder. Through the control of granularity, we have improved the quality of our products and achieved excellent results. 
Fourth, the advantages of the laser particle size analyzer in the coating industry The powder coating industry has used screening and other particle size detection methods in particle size testing, but it can not achieve the purpose of analyzing the particle size to improve product quality. The current standard proposes the use of a laser particle size analyzer for the detection of particle size distribution in powder coatings. The laser particle size analyzer measures the size of the particles according to the principle of light scattering. The test is convenient, accurate and fast. The test process can be simply described as: When the particles pass through the laser beam, the scattered light of each particle is illuminated in parallel on the detectors with different scattering angles. The light energy of the detector forms the scattering spectrum; the computer inverses the scattering spectrum. The particle size distribution is the particle size distribution of the particles we need. The former process is to obtain the scattering spectrum of the particle group. The information is transmitted in parallel with the speed of light. All the tests are fast. The latter process is based on the MIE scattering theory and is completed serially by the computer in a digital way, so the test is accurate. Laser particle size analyzer is also because it has such advantages in the coating industry has been widely used.
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Particle size affects the performance of powder coatings
First, the domestic coating market situation Since 2011, most of the paint companies have operational difficulties, decreased effectiveness and other issues are more prominent. The two-headed squeeze of product prices and production costs has led to a substantial decline in corporate profits. At the same time, due to factors such as high prices of raw materials, financing costs and labor costs, the production costs of companies are still high. At present, the domestic coatings companies face many new developments, mainly because of insufficient market demand. From the perspective of external demand, since the outbreak of the international financial crisis, the global demand situation has undergone great changes. In particular, the deep impact of the recent international financial crisis has continued to appear, leading to a sharp reduction in the external demand for paint products in China and a decline in export growth. According to analysis, the impact of the world financial crisis on China's paint industry began in September 2008, with overseas orders falling by about 10% year-on-year. From the perspective of domestic demand, China's macroeconomic growth has slowed down, and the market following real estate regulation has become sluggish. As a supporting industry for the national economy, the domestic consumption of paint products is also facing the problem of being able to start quickly and effectively. Although the country has recently taken various measures to expand domestic demand, it still needs to go through a relatively difficult period from the perspective of the Chinese chemical industry itself. The downturn in the upstream market and the cooling of consumer hot spots mean that the domestic demand for coatings in the downstream is also in a weak state. Although the Chinese paint market still has a large room for growth and the prospects are promising, we must realize that the level of development of the Chinese paint industry and the developed countries include the market capacity and per capita consumption level, the degree of market regulation, and the degree of industrial concentration. There is still a big gap between talent, enterprise scale and financial resources, technological innovation capabilities, business models and ideas, laws and regulations.