You have to know the performance of the car hub powder coating.

Abstract: The rapid development of the
automotive industry led to the application of powder coatings on automotive wheels, this paper selected PPG industrial coatings the highest degree of industrialization, OEM (Ford, GM, etc.) host plant certified base powder series and acrylic transparent powder series, from the performance requirements of their respective characteristics and specific requirements, increase the market to understand it, easy to implement the application.
1, the foreword
powder coating since the early 1970s began to be used in the automotive field, has achieved great success, especially in recent years has achieved rapid development.
, on the one hand, it greatly reduces the VOC discharge, on the other hand, it greatly improves the utilization rate of coatings

. In China, automotive powder coating is mainly used in automotive parts, such as automotive engines, aluminum wheels, chassis, filters, joysticks, mirrors, wipers and horns and other components of the coating.
automotive powder coating epoxy type, epoxy polyester type, polyester type, polyurethane type and acrylic type. With the improvement of technology and the performance of automotive powder coatings, it is now able to meet the requirements of automotive parts coating, such as appearance, weather resistance, chemical resistance, scratch resistance, UV resistance and so on.
and with the rapid growth of cars in recent years, the powder coating of aluminum wheels has been developed rapidly.
the current market application of aluminum hub powder coating is mainly wheel base powder and cover light through flour. Hub base powder is mainly epoxy type, epoxy polyester blend type, pure polyester type, etc. , cover light through flour is mainly polyester type, GMA acrylic type and so on.
2, the performance requirements and trends of the base powder
on the aluminum wheels coated with base powder, one is to improve its corrosion resistance, extend its service life, and the other is to improve its appearance decoration.
base powder from the gloss mainly has highlights, flat and matte, high-gloss base powder mainly supporting electroplating silver paint, so that there is a brighter appearance, flat and matte with coarse silver and so on.
performance and appearance are of paramount importance to the base powder. The particle size of the base powder should be between 30-45 microns, which can balance the leveling and powdering rate;
car wheels are the main load-bearing parts of the car, not only require sufficient mechanical strength, but also require sufficient toughness to ensure impact resistance, for some wheel types that require a fine car, the bottom powder cured paint film thickness of about 100 microns needs to impact greater than 50 kg/cm.
to reduce the car crash plastic, the base powder adhesion needs to reach level 0. PPG industrial coating PCFC90203 series and PCTC70101 series base powder performance requirements see Table 1:base powder in addition to the most basic performance, with the major OEM host plant on the wheel coating performance requirements to improve, the need for substrate and paint matching is very good, which requires color paint in the primer has a good wetting and background re-coated paint wetting.
In order to meet the requirements, the surface pressure of the base powder needs to be increased in order for the liquid to spread on the base surface, and we all know that the hub generally needs to be attached to the balance block, which also requires a high surface pressure of the base powder, in order to improve the pull of the balance block.
normal base powder surface stress is between 30-32mN/m, which requires the search for new materials with high surface stress, such as the appropriate increase in the surface strength of resins and additives.
but the base powder needs to be added leveling agent, leveling agent is acrylates, leveling agent will reduce the surface pressure of the system, which requires balancing the amount of leveling agent added.requirements and trends of AC3, acrylic transparent powders
In the past decade, powder varnishes used in automotive carbons have attracted the attention of major powder manufacturers. Powder varnishes for automobiles must perform well in terms of film thickness, gloss and brightness.
must have good resymnonsmic properties, such as impact resistance, scratch resistance and excellent adhesion. Coatings must be resistant to acid rain corrosion, temperature fluctuations, UV resistance, and environmental protection and safety requirements, in line with quality objectives at the same time production more economical.
the early 1990s, BMW began analyzing and evaluating the widely used varnish systems in order to make a choice between the varnish systems used in automobiles. The final choice of methyl acrylic shrinkage glyceride (GMA) acrylic powder varnish, due to its durability and the use of powder coatings more advantages.
reason why GMA acrylic resins have been chosen as automotive powder varnishes is the maturity of the technology, which has been used in automobiles for nearly 30 years and has proven to have the excellent performance required by automotive OEMs.
, the first European carmaker to use powder varnish for standard products, decided in July 1996 to use powder varnish technology. . PPG's world-class PCC10103 acrylic transparent powder series is widely recognized for its superior performance to meet the requirements of major OEMs, with its main performance such as Table 3. 4, conclusion In short, with the development of powder coating technology, aluminum wheel application base powder and acrylic transparent powder will have more and higher requirements, which requires us to constantly screen raw materials, and even customized special performance of raw materials to meet its performance and environmental requirements, to make better and more suitable for the wheel coating powder coating.
source. . . PPG Industrial Coatings (Suzhou) Co., Ltd.
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