Function and market prospect of powder coatings (2 of 4)

Types and modification methods of common heavy-duty anti-corrosion powder coatings

Other common anti-corrosion coatings, such as epoxy, polyester epoxy and acrylic, can also be used as heavy-duty anti-corrosion coatings after modification.

At present, the heavy-duty anti-corrosion powder coating mainly realizes the protection of materials through physical shielding, including the modification of base material resin, pigment and filler; At the same time, the coating methods of thick coating, multi coating or composite coating are used to generate one or even multiple layers of dense protective film to improve the heavy-duty anti-corrosion performance of the coating. (the use of nano iron titanium powder, graphene, Emery and chemically modified resin can also further improve the anti-corrosion ability of the resin.)

Due to the limitations of construction conditions, liquid coatings are still the main heavy-duty anti-corrosion coatings. Environmental protection, high performance, multi-function and low energy consumption are the development direction of heavy-duty anti-corrosion coatings in the future.

Weather resistant powder coating

Weather resistant powder coating refers to the powder coating that can withstand the test of outdoor environment and maintain its decoration and protection function for a long time. Powder coatings exposed outdoors will be aged and degraded due to sunlight exposure, humidity, temperature, pollutants (such as acid rain) and other factors. For example, exposure to sunlight will lead to yellowing, fading and even pulverization of the coating; Drenching and condensation will cause discoloration, loss of light and corrosion of the coating. At present, powder coatings are widely used in outdoor, such as transportation, outdoor decoration, engineering machinery and so on, which puts forward higher requirements for the weather resistance of powder coatings.

The improvement of weather resistance of powder coatings depends on the selection and supporting use of resin types, pigments, fillers and additives. On the one hand, you can select the appropriate base resin or modify the base resin and select the appropriate curing agent. Such as polyester / TGIC system, polyester / HAA system, acrylate, polyurethane, polyvinylidene fluoride (PVDF), fluorocarbon and silicone modified polyester system. On the other hand, a certain amount of antioxidants, UV absorbers and free radical trapping agents can be added to slow down the aging of the coating. Additives have been systematically used in the research of improving the weather resistance of powder coatings in China.

Types of commonly used weather resistant powder coating resins

There are many kinds of resins used in weather resistant powder coatings, but their durability is generally poor. Fluorocarbon powder coating (collectively referred to as fluororesin powder coating) shows excellent weather resistance due to its own characteristics. It is widely used in the field of high-end building aluminum profiles, electrical electronics, aerospace and other fields. The production and construction process is mature, and it is a recognized super weather resistant coating variety in the world. The properties of thermosetting fluorocarbon powder coatings (such as weather resistance, corrosion resistance, etc.) are much higher than those of polyester and epoxy powder coatings.

However, fluorocarbon powder coating has excellent weather resistance, but accounts for a small proportion in the market. A series of fluorocarbon powder coating products have not been formed in China. There are still many problems to be solved: including optimizing the production process of fluorocarbon powder coating and reducing the production cost; Improve the appearance, gloss and impact resistance of fluorocarbon powder coating. Developing super weather resistant powder coatings with excellent performance is still a challenging task.

Antibacterial powder coating

Antibacterial powder coating refers to the powder coating that can kill microorganisms or hinder the growth and reproduction of microorganisms. In daily life, ordinary disinfectant and other sterilization products can only play a short-term sterilization role, but if the antibacterial performance of the coating on the surface of the object is improved, the coating can inhibit the growth of microorganisms on the surface and keep the surface clean for a long time.

Antibacterial additives play a major role in antibacterial coatings. Most organic antibacterial materials are liquid, so their application is limited; Inorganic antibacterial agents, including silver ions and copper ions. Although this kind of antibacterial agent takes effect slowly, it has the advantages of low toxicity, heat resistance, persistence, broad antibacterial spectrum and no drug resistance. PPG, BASF and other companies have added silver ions to powder coatings.

Unfortunately, inorganic antibacterial agents have some disadvantages, such as poor compatibility with polymer, poor solubility, slow sterilization and discoloration, which are difficult to meet the needs of human life. Therefore, antibacterial powder coatings have gradually developed from single type to composite type. In addition, there are still many problems to be solved in the preparation of antibacterial agents. For example, the loss of widely used silver antibacterial agents weakens the durability of antibacterial coatings... Therefore, developing general antibacterial coatings with excellent properties such as durability and low toxicity is still a challenging task.

Nanjing Powder New Material Co., Ltd. is specialized in producing various epoxy powder coating, epoxy polyester powder coating, polyester powder coating, flat powder coating, texture powder coating, functional powder coating, polyurethane powder coating, acrylic powder coating and other powder coating products.

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