This article systematically introduces the concept, formation principle, characteristics, functions, applications, selection considerations, and common problem-solving measures of network texture powder coating. It focuses on the application fields of network texture powder coating to help everyone better understand what network texture powder coating is, as well as its characteristics and functions.
What Is Network Texture Powder Coating
Network texture powder coating is a type of artistic powder coating that forms clear three-dimensional network patterns during the curing process through the combination of special additives (such as network texture agents and catalysts) with the resin system, caused by differences in surface tension.It is a type of artistic powder coating, alongside wrinkle texture, hammer tone texture, and crackle texture coatings. The formation of its texture is based on the Benard vortex effect.
Formation Principle of Network Texture Powder Coating
The formation principle of network texture powder coating is to utilize the synergistic effect of surface tension differences and crosslinking rate differences during the melting and curing process of the coating film. This drives the coating to undergo orderly flow and stacking, eventually forming a three-dimensional network pattern.The core process can be divided into three steps:
1. Melting and Surface Tension Differentiation
After the powder melts under heat, the network texture agent in the formulation actively reduces the local surface tension, forming a surface tension gradient with the surrounding areas.
2. Flowing and Stacking to Form Texture
Driven by the surface tension gradient, the coating moves from the low surface tension area toward the high surface tension area, forming convection vortices similar to hexagonal honeycomb structures (Benard effect).
At the same time, the high surface tension areas accelerate crosslinking due to the action of catalysts, causing viscosity to increase rapidly and become “frozen”. The low surface tension areas remain fluid. This dynamic competition between flow and curing forces the coating film to shrink and stack, revealing a raised and recessed three-dimensional network pattern.
3. Curing and Fixing
Continued baking allows the coating film to completely crosslink, permanently locking the texture.
Characteristics of Network Texture Powder Coating
The main characteristics of network texture powder coating are as follows:1. Unique Three-Dimensional Network Decorative Effect
After curing, it forms clear three-dimensional hexagonal or tortoise-shell-like network patterns. The texture has a strong raised and recessed effect, giving workpieces a high-end leather-like or woven material texture and significantly improving the visual quality of products.
2. Excellent Substrate Concealing Ability
The three-dimensional network texture can effectively cover minor defects such as scratches, sand holes, and welding marks on metal surfaces, reducing the requirements for substrate pretreatment accuracy.
3. Excellent Comprehensive Protection Performance
The coating has high hardness, scratch resistance, impact resistance, and flexibility (good adhesion). At the same time, the dense network structure can effectively block corrosive media and provide excellent corrosion protection.
Outdoor systems also have excellent weather resistance and UV resistance.
4. Single-Layer Coating, High Efficiency and Economy
Only one spraying process and one baking process are required to achieve the final coating effect, eliminating the need for primer or intermediate coating layers. The process is shorter, production efficiency is higher, and the overall coating cost is lower.
5. Highly Sensitive to Application Conditions
The clarity, size, and three-dimensional effect of network textures are highly sensitive to curing temperature, film thickness uniformity, and baking time.
Excessively high or low temperatures, or excessive variation in film thickness, may cause the pattern to disappear, become blurred, or become uneven in size. Therefore, the “curing window” parameters provided by the supplier must be strictly followed.
Functions of Network Texture Powder Coating
The main functions of network texture powder coating are reflected in the following aspects:1. Enhancing Decorative Appearance
After curing, it forms three-dimensional hexagonal or tortoise-shell-like network patterns, giving workpieces a high-end leather-like or woven texture. It significantly improves visual quality and tactile feel, and is commonly used for products that need to highlight appearance quality.
2. Effectively Concealing Substrate Defects
The raised and recessed network texture can effectively cover processing defects such as scratches, welding marks, and sand holes on metal surfaces, reducing the requirements for precision machining of substrates and improving the qualified rate of finished products.
3. Providing Mechanical Protection
The coating has high hardness, scratch resistance, and impact resistance. At the same time, the dense network structure can effectively block moisture and corrosive media, extending the service life of substrates in indoor or outdoor environments.
4. Simplifying the Coating Process
Only one spraying process and one baking process are required to achieve both decorative and protective effects. It eliminates the need for primer or intermediate coating layers, saving working time and coating costs.
Application Fields of Network Texture Powder Coating
Network texture powder coating is mainly applied in the fields of indoor industrial corrosion protection and electrical insulation. The specific application fields are as follows:
1. Construction and Security Field
High-end security doors, fire doors, aluminum alloy doors and windows, and courtyard fences. The network texture is used to conceal welding marks and provide excellent outdoor weather resistance.
2. 3C Electronic Product Field
Computer cases, speaker housings, and projector accessories. It provides a leather-like touch and modern industrial texture while meeting wear resistance requirements.
3. Automotive and Transportation Field
SUV bumpers, roof racks, dashboard decorative parts, and bicycle frames. It combines stone impact resistance, corrosion resistance, and matte decorative functions.
4. Industrial Equipment and Furniture Field
CNC machine tool panels, medical equipment housings, office filing cabinets, and outdoor metal tables and chairs. It effectively covers casting defects and provides oil-resistant, easy-to-clean hard surfaces.
How to Select Network Texture Powder Coating
When selecting network texture powder coating, we may encounter the problem of not knowing how to choose. Based on our industry experience, we recommend focusing on the following aspects when selecting network texture powder coating.1. Consider the Application Environment
(1) Indoor Applications
Choose epoxy systems, which have strong adhesion and lower costs. They are suitable for indoor metal parts such as filing cabinets and control panels.
(2) Outdoor Applications
Polyester/TGIC or polyester/HAA systems must be selected. They provide excellent weather resistance and UV resistance, and are suitable for security doors, outdoor furniture, automotive components, and other applications.
2. Consider the Texture Style
(1) Fine Network Texture
The texture is delicate and uniform, similar to leather grain, with a smooth tactile feel. It is suitable for applications requiring refined appearance, such as 3C electronic products and precision instruments.
(2) Coarse Network Texture
The network lines are rough with a strong three-dimensional effect. It has outstanding ability to conceal substrate defects and is suitable for high-end security doors, large industrial equipment, and workpieces that require a strong style or need to cover obvious defects.
3. Consider the Workpiece Shape
(1) Complex Workpieces (with Grooves, Inner Corners, and Deep Cavities)
Fine network texture is recommended because it has better leveling performance, making it less likely for exposed substrate areas or blurred textures to appear at edges and corners.
(2) Large Flat Workpieces
Both coarse network texture and fine network texture can be used, but special attention should be paid to film thickness uniformity.
When the film thickness is too thick, the network texture becomes coarser or even merges together. When the film thickness is too thin, the texture becomes unclear or the substrate may be exposed.
4. Consider Color and Gloss
Network texture coatings are mostly matte finishes (60° gloss is usually ≤35%).
Light colors (white, gray) can clearly highlight the layered effect of the network texture, but have weaker hiding power, so the film thickness needs to be appropriately increased.
Dark colors (black, dark brown) provide a stronger three-dimensional texture effect, but the texture details may not be as obvious as those of light colors.
Adding metallic sparkle effects (aluminum powder) can enhance the product grade, but it will reduce the clarity of the texture.
5. Confirm Curing Process Parameters
Network texture is extremely sensitive to curing temperature and time. Excessively high temperatures will make the network texture become shallow or even disappear, while excessively low temperatures will cause the network texture to become too coarse or blurred.
When selecting the product, it is necessary to confirm the curing window with the supplier (such as 180℃ × 15min) and ensure that your baking equipment can stably maintain these conditions.
Common Problems and Solutions of Network Texture Powder Coating
The most common problems encountered during the use of network texture powder coating are mainly reflected in the following aspects. Based on our industry experience, we propose corresponding solutions to help effectively solve the powder coating problems you encounter.1. Unclear Texture or Texture Disappearance
Possible causes:
The curing temperature is too high (the texture becomes shallow or disappears), the coating thickness is too high (the texture is filled and merged), or the resin and network texture agent are incompatible.
Solutions:
Strictly control the oven temperature within ±5℃ of the recommended range, ensure that the film thickness remains stable at 60–90μm (excessive thickness should be avoided), and select a resin system with good compatibility.
2. Uneven Network Texture Size or Local Areas Without Texture
Appearance:
The texture size varies on the same workpiece, or some areas appear flat.
Possible causes:
Uneven spraying film thickness, abnormal local surface tension caused by residual oil contamination after pretreatment, or poor dispersion of the network texture agent.
Solutions:
Optimize spraying parameters to ensure uniform film thickness; strengthen the degreasing process during pretreatment; ensure sufficient pre-dispersion of network texture additives during production.
3. Pinholes and Craters
Small depressions appear on the coating surface.
Possible causes:
Water vapor generated during HAA system curing fails to escape in time, powder absorbs moisture, or compressed air contains oil and water.
Solutions:
Add degassing agents (such as benzoin) into HAA formulations; keep powder storage conditions dry; check air source quality before spraying and install an oil-water separator.
4. Poor Adhesion or Brittle Coating
Common situations:
It commonly occurs on recoated workpieces or over-cured coatings.
Possible causes:
Over-curing of the bottom layer causes a lack of active groups for crosslinking with the recoating layer, or excessively high curing temperature/overly long curing time increases coating crosslinking density, making the coating brittle.
Solutions:
Control the bottom coating layer to avoid over-curing; sand the bottom layer before recoating to increase mechanical anchoring; strictly follow curing window parameters and avoid over-baking.
5. Unstable Performance of Recycled Powder
Possible causes:
Recycled powder may contain partially crosslinked resin or impurities, causing abnormal texture effects in newly sprayed coatings.
Solutions:
Mix recycled powder with new powder at a fixed ratio (generally no more than 20%–30%), and conduct trial spraying on sample panels first to confirm the texture effect.
If you encounter some difficult problems during the use of network texture powder coating, please feel free to contact us at any time to obtain professional technical support, discuss solutions together, and promote the development of the powder coating industry.
We hope this article can provide you with a professional and reliable reference regarding the powder coating industry. We sincerely welcome you to consult us regarding product performance, industry standards, application methods, precautions, or any related questions about powder coating products.
We look forward to your inquiries through messages or direct contact at any time, so that we can provide you with more detailed product information, demonstration videos, or customized solutions to help you fully understand the functions and advantages of our products.
