In the fields of new energy, new materials, and flexible electronics, a material called "carbon nanotubes" (CNTs) is becoming a research hotspot. It is hailed as the "king of nanomaterials," boasting astonishing mechanical, electrical, and thermal properties.

For the high-precision coating industry, carbon nanotubes are not only highly challenging coating targets but also "magic additives" that can significantly enhance product performance. Understanding the properties of carbon nanotubes is key to mastering next-generation coating processes. 

Formed from a single layer of graphene rolled, with diameters typically between 1 and 3 nanometers, and carbon purity reaching over 98%. Its electrical properties are extremely special, and depending on the way it is curled (chiral), it can exhibit metallic or semiconductor properties

Metal types are suitable for efficient conductive networks; Semiconductor types are the core substrate for flexible transistors and sensor chips in the post-Moore era.

It is an ideal material for future nanoelectronic devices. 

Nested with multiple layers of coaxial single-wall tubing, resembling a Russian nesting doll. Their diameters are larger, typically ranging from several nanometers to several tens of nanometers, offering higher structural stability and lower mass production costs. They are mostly used in conductive coatings for energy storage, electromagnetic shielding films, and structural reinforcement materials.

It is more widely used in composite material reinforcement, conductive additives, and other fields.

Carbon nanotubes attract attention due to their outstanding physicochemical properties, with core performance ranking among the top known materials:

For high-precision coating equipment, the application value of carbon nanotubes mainly lies in two aspects: first, as a functional slurry for coating; second, as additives to enhance coating performance.

Adding a small amount of carbon nanotubes to polymer, ceramic, or metal substrates can significantly enhance the mechanical strength, wear resistance, and thermal conductivity of composites.

Mechanical enhancement: The high strength and high modulus of carbon nanotubes can effectively transmit and disperse stress, greatly improving the tensile strength and toughness of the composites.

To address these challenges, high-precision coating equipment needs to achieve technological breakthroughs in the following areas:

Uses a constant temperature sealed circulation feeding unit, combined with a low-speed, low-shear stirring design, ensuring the carbon nanotube long-diameter structure is not interrupted throughout. For extremely low concentration semiconductor inks, precise micro-feeding is required to ensure paste uniformity remains unchanged during long-term coating.

The closed-loop control accuracy of coating gaps must reach the ±0.1μm level, with substrate tension continuously controlled in segments, suitable for various substrates such as PET, PI, aluminum foil, and porous electrodes. Through precise control, it is possible to stably prepare standard conductive films of 10–20μm, keeping the finished product's conductivity at 3–10Ms/m, and achieving mechanical tensile properties that meet standards.

Optimized scraper runners and negative pressure coating cavities to reduce slurry flow shear force, fully preserving the ultra-long carbon nanotube bundle structure. Films prepared with low-shear processes can reduce conductivity degradation by less than 5% after 10,000 bendings, meeting the demands of high-durability scenarios such as wearable sensing and flexible circuits.

New energy sector: For hydrogen fuel cell catalytic layers and perovskite photovoltaic conductive current collectors, achieve high-precision thin-layer coating to reduce battery internal resistance and extend cycle life;

Semiconductors and flexible electronics: Narrow precision coating of high-purity semiconductor single-wall tube dispersions, free of impurity contamination, uniform film layer, meeting the needs of carbon-based electronics R&D;

New material composite film: Roll-to-roll mass production equipment continuously fabricates conductive films, with adjustable width, ensuring stable consistency between finished product strength and conductivity;

Life Sciences: Ultra-thin, low-damage carbon nanoconductive coating with excellent biocompatibility, compatible with medical wearable monitoring sensors.

As a key nanomaterial of the 21st century, carbon nanotubes are bringing revolutionary changes to fields such as green energy, new materials, and life sciences. In the coating industry, the application of this "super material" is driving process precision to new heights.

The dispersion stability of nano-scale fillers, the thickness consistency of submicron-level coatings, and large-area defect-free film formation—these are not barriers that traditional coating technologies can easily overcome. The ultimate release of material performance always depends on the synchronous evolution of process equipment. Continuous investment in R&D and precise equipment manufacturing capabilities are the key links connecting material innovation to product implementation.