Zhejiang Runhui New Material Co., Ltd.
Zhejiang Runhui New Material Co., Ltd., a leading innovator in advanced materials, specializes in the research, development, and production of special functional paper and aerogel-based insulation solutions. Based in Zhejiang Province, the company leverages partnerships with key scientific research institutions to pioneer technologies in aerogel materials, establishing itself as a domestic leader in the field.
Runhui's product portfolio has aerogel blankets, panels, insulation paper, and aerogel coatings, all engineered to meet high-performance standards for thermal management, durability, and environmental sustainability. Among these, aerogel coating stands out for its versatile applications across construction, automotive, electronics, and textiles.
Runhui's aerogel coating is a nanoscale silica-based material, formulated to combine the exceptional thermal insulation properties of aerogels with functional characteristics tailored for specific use cases. The company's proprietary manufacturing process ensures the coating retains the porous structure of aerogels while enhancing mechanical strength and surface properties. Backed by a dedicated team of engineers and a key laboratory for special fiber research, Runhui's aerogel coatings are designed to address complex material challenges. The company's commitment to innovation is further reflected in its use of sustainable raw materials and energy-efficient production methods, aligning with global efforts to reduce environmental impact.
The Unique Structure Of Aerogel Coating
Aerogel coatings derive their exceptional properties from their nanoscale structure, a hallmark of aerogel materials. At the core of Runhui's aerogel coating is a three-dimensional network of silica nanoparticles, creating a highly porous matrix with an extremely low density. This structure is engineered at the molecular level to balance multiple functional requirements:
Nanoporous Architecture: The coating contains interconnected pores, typically ranging from 2 to 50 nanometers, which are significantly smaller than the wavelength of visible light and most liquid droplets. This porosity forms the basis for permeability and liquid repellency, as it allows gases (air or moisture vapor) to pass through while blocking larger liquid molecules. The uniformity of these pores, achieved through Runhui's precise manufacturing controls, ensures consistent performance across the coating's surface.
Surface Modification: Runhui's formulation has surface treatments that alter the coating's chemical properties. By introducing hydrophobic groups (water-repelling molecules) onto the silica nanoparticle surfaces, the coating resists liquid adhesion without compromising its porous structure. This chemical modification is applied uniformly, ensuring that even deep within the pore network, the surface remains resistant to liquid wetting.
Binding Agents: To enhance wear resistance, the aerogel matrix is reinforced with specialized binders that strengthen the connections between nanoparticles. These binders, often polymer-based, improve the coating's tensile strength and abrasion resistance, ensuring it withstands mechanical stress over time. The binders are selected for their compatibility with the silica network, avoiding pore blockage and maintaining the coating's permeability.
This combination of structural and chemical engineering enables aerogel coating to achieve the trifecta of wear resistance, high permeability, and liquid repellency-properties that are often mutually exclusive in conventional coatings.
How Aerogel Coating Achieves Wear Resistance
Wear resistance in aerogel coatings is achieved through a combination of material reinforcement and structural design, addressing the inherent brittleness of pure aerogels:
Reinforced Matrix Structure
Runhui's aerogel coating incorporates a dual-phase system: the porous silica aerogel network is embedded within a flexible polymer matrix. This polymer phase acts as a "shock absorber," distributing mechanical stress across the coating when subjected to friction, impact, or abrasion. The silica nanoparticles, despite their fragility individually, form a rigid framework when interconnected, while the polymer binder prevents crack propagation. In industrial settings where machinery components are coated, this structure ensures that repeated contact with moving parts does not cause the coating to chip or flake. This durability is particularly valuable in high-wear environments, where coatings are exposed to constant mechanical stress.
Nanoparticle Density Control
The density of silica nanoparticles in the coating is precisely calibrated. A higher concentration of nanoparticles increases the coating's hardness, enhancing its resistance to scratching and wear. Runhui's manufacturing process ensures uniform dispersion of nanoparticles, avoiding agglomeration that could create weak points. This uniformity means the coating wears evenly, reducing the risk of localized damage that might compromise its other properties. In applications, this even wear ensures that the coating maintains its functional properties across its entire surface, even after prolonged use.
Surface Hardening
An additional surface-hardening treatment is applied to the aerogel coating, creating a thin, durable outer layer. This layer, while maintaining the coating's porous structure, has a higher cross-linking density, making it more resistant to abrasion. In automotive applications, this hardening allows the coating to withstand exposure to road debris and cleaning agents without degradation. The surface layer acts as a barrier against UV radiation, preventing the underlying polymer matrix from breaking down over time-a common issue in conventional coatings that leads to reduced wear resistance.
How Aerogel Coating Achieves High Permeability
High permeability-specifically, the ability to allow gases and moisture vapor to pass through while blocking liquids-is a defining feature of Runhui's aerogel coating, enabled by its nanoscale porosity:
Size-Selective Porosity
The pores in aerogel coating are engineered to be smaller than liquid droplets (which typically measure tens to hundreds of micrometers) but larger than gas molecules (water vapor, which is around 0.1 nanometers). This size selectivity allows gases to diffuse through the coating freely, preventing trapped moisture that could lead to mold growth or material degradation. In construction applications, this permeability enables buildings to "breathe," releasing internal humidity while keeping rainwater out. This is particularly important in regions with high humidity, where trapped moisture can cause structural damage or affect indoor air quality.
Interconnected Pore Network
The pores in the coating form a continuous, interconnected network, ensuring unobstructed pathways for gas flow. Unlike some porous coatings with isolated or blocked pores, Runhui's aerogel coating maintains these pathways even after application, thanks to its low-density structure and careful curing process. This connectivity is critical for applications, where the coating must allow sweat vapor to escape to keep the wearer comfortable. In outdoor gear, this network ensures that moisture generated by the body can diffuse outward, preventing the buildup of sweat that would otherwise make the garment uncomfortable or reduce its insulating properties.
Thin Film Application
Aerogel coating is applied as a thin film, typically ranging from a few micrometers to a millimeter in thickness. This thinness minimizes resistance to gas diffusion, enhancing permeability. The coating's lightweight nature means it can be applied to flexible substrates without restricting their ability to breathe. In textile applications, this thin film ensures that the fabric retains its flexibility and drape, while still providing the desired functional properties. A jacket coated with aerogel remains lightweight and comfortable, while its permeability ensures the wearer stays dry from external rain and internal sweat.
How Aerogel Coating Achieves Liquid Repellency
Liquid repellency in aerogel coating is achieved through a combination of structural and chemical modifications that prevent liquids from wetting or penetrating the surface:
Hydrophobic Surface Chemistry
Runhui's aerogel coating undergoes surface functionalization, where hydrophobic molecules (silanes) are attached to the silica nanoparticles. These molecules repel water and other polar liquids by reducing the surface energy of the coating. When a liquid droplet comes into contact with the coating, it forms a high contact angle (greater than 90 degrees), rolling off the surface instead of spreading or soaking in. This effect is similar to water beading on a waxed car, but enhanced by the coating's porous structure. In applications, this hydrophobicity ensures that liquids do not adhere to the surface, reducing staining and simplifying cleaning.
Air Trapping In Pores
The nanoscale pores in the coating trap a layer of air at the surface, creating a barrier between the liquid and the coating's solid matrix. This air layer further reduces the contact between the liquid and the coating, reinforcing repellency. Even if a liquid droplet momentarily touches the surface, the trapped air prevents it from adhering, ensuring it rolls off before penetration can occur. This effect is particularly pronounced in coatings with a high pore density, as more air is trapped, creating a more effective barrier. In marine applications, this air layer helps protect coated surfaces from saltwater damage, as the liquid is unable to make sustained contact with the coating.
Resistance To Liquid Pressure
The combination of hydrophobic chemistry and porous structure allows the coating to resist liquid penetration even under moderate pressure. In outdoor gear applications, the coating can withstand light rain or splashes without allowing water to seep through, while still permitting vapor escape. This balance is critical for maintaining repellency and permeability. In industrial settings, this resistance to pressure ensures that the coating remains effective even when exposed to splashes of oils or chemicals, protecting underlying materials from corrosion or damage.
Synergy Between Properties
The simultaneous achievement of wear resistance, high permeability, and liquid repellency makes Runhui's aerogel coating suitable for diverse applications where these properties are critical:
Construction And Building Materials
Applied to exterior walls or roofing membranes, aerogel coating protects against rain and moisture while allowing the building to release internal humidity, preventing mold and structural damage. Its wear resistance ensures it withstands exposure to wind, debris, and UV radiation over time, reducing maintenance needs. In green building projects, this combination of properties contributes to improved energy efficiency, as the building's internal climate remains stable without relying on excessive ventilation.
Textiles And Protective Gear
In outdoor clothing or industrial workwear, the coating repels water and oils while allowing sweat vapor to escape, keeping the wearer dry and comfortable. Its wear resistance ensures the coating remains effective even after repeated washing and abrasion from daily use. This is particularly valuable in professional settings, where clothing must withstand harsh conditions while maintaining comfort and protection.
Automotive And Aerospace
Aerogel coating applied to vehicle exteriors or aircraft components resists corrosion by repelling water and chemicals, while its permeability prevents moisture trapping. Its wear resistance withstands the rigors of road or air travel. In aerospace, the lightweight nature of the coating contributes to fuel efficiency, making it an attractive alternative to heavier conventional coatings.
Electronics And Industrial Equipment
On electronic enclosures or machinery parts, the coating protects against liquid spills and humidity while allowing heat to dissipate through gas diffusion. Its wear resistance ensures long-term protection against friction from moving parts or handling. This is critical in electronics manufacturing, where even small amounts of moisture can cause malfunctions, and equipment is frequently handled or exposed to industrial fluids.
Advantages Over Conventional Coatings
Aerogel coating outperforms conventional coatings in balancing the three key properties:
Versus Wax or Polymer Coatings: While these coatings may repel liquids, they often block permeability, trapping moisture. They lack the wear resistance of aerogel coatings, degrading quickly under mechanical stress. A wax coating on a wooden deck may repel water initially but becomes brittle over time, cracking and allowing moisture to seep in, whereas an aerogel coating would maintain repellency and permeability for longer.
Versus Porous Ceramic Coatings: Porous ceramics offer permeability but are brittle, lacking wear resistance. They typically lack liquid repellency, absorbing water instead of repelling it. In high-temperature industrial applications, ceramic coatings may crack under thermal stress, whereas aerogel coatings retain their flexibility and structural integrity.
Versus Hydrophobic Sprays: These sprays provide liquid repellency but have poor durability, wearing off quickly. They do not offer the same level of permeability or structural reinforcement as aerogel coatings. A hydrophobic spray on a backpack may repel water for a few uses but requires frequent reapplication, whereas an aerogel coating would remain effective through repeated use and washing.