Nanocellulose｜Coatings and polymer composites

Under the industrial trends of water-based, low-carbon and high-performance, the coatings and polymer composite materials industries are continuing to look for new functional additives that combine reinforcement, rheology control, and green traceability. Nanocellulose ( CNF/CNC ) relies on its natural biomass source, high aspect ratio, abundant surface hydroxyl groups and customizable modification characteristics to become a valuable green functional component in coating systems, resins and elastomer composites. A small amount of addition can simultaneously optimize processing rheology, mechanical strength, weather resistance and other key indicators. It can replace some traditional synthetic rheology agents and inorganic powder reinforcing fillers to help reduce carbon emissions and upgrade formulas.

Value and application in coating systems

In water-based coatings, nanocellulose has four core functions: rheology regulation, anti-settlement, film-forming reinforcement, and weather resistance improvement. It is suitable for water-based acrylic, water-based polyurethane, industrial anticorrosive paint, wood paint, architectural coatings, inorganic mineral coatings, functional protective coatings and other systems.

In a static state, nanocellulose fibers rely on hydrogen bonds and fiber entanglements to build a stable three-dimensional network, giving the system a yield value, effectively preventing titanium dioxide, mica powder, and functional fillers from sinking and stratifying, and solving the pain points of pigment settlement, stratification, and floating colors during storage; external shearing (stirring, spraying) (, roller coating), the network opens quickly and the viscosity decreases, showing excellent shear thinning characteristics, smooth construction, and not easy to splash; after the shear disappears, the network recovers quickly, effectively inhibiting sagging, taking into account both thick coating workability and coating film appearance. It is a green rheology solution that integrates anti-settling and anti-sag.

After the film is solidified, evenly dispersed nanofibers are embedded inside the paint film to form an intertwined support skeleton, which can improve the hardness, adhesion, wear resistance and scratch resistance of the paint film, reduce the risk of cracking and peeling of the paint film; extend the penetration path of water vapor and corrosive media, optimize the barrier properties of the coating, and improve the anti-corrosion and moisture-proof performance It inhibits UV aging and thermal oxidative degradation, improves yellowing resistance, aging resistance, and weather resistance, and extends the service life of the coating. It does not release VOC , and is suitable for low-odor formulation requirements such as environmentally friendly coatings, food contact grade coatings, and children's paints, and can reduce the amount of traditional acrylic thickeners, bentonite and other additives.

Relying on surface modification technologies such as TEMPO oxidation, carboxylation, and cationic modification, we can control the charge, dispersion and interfacial compatibility of nanocellulose, adapt to complex coating systems with different pH and ionic strengths, and avoid common problems such as agglomeration, granulation, and impact on gloss. There are mature adaptation solutions for high-gloss paint and matte paint.

Enhanced modification applications in polymer composites

Polymer matrices generally have shortcomings such as low modulus, insufficient heat resistance, easy creep, and difficulty in balancing toughness and strength simultaneously. As a bio-based nano-reinforcement phase, nanocellulose has a low addition amount and a density much lower than traditional reinforcing materials such as glass fiber and carbon black. It is suitable for resin and elastomer systems such as 、PLA 、PBAT TPU , water-based polyurethane, epoxy resin, natural rubber, EPDM , etc., and is widely used in 3D the development of films, injection molded parts, printing consumables, elastic products, composite sheets and other products.

The underlying logic of its reinforcement comes from the stress transmission of high-aspect-ratio nanofibers: a continuous nanonetwork is formed inside the matrix, and external forces are quickly dispersed and transmitted through interface hydrogen bonding or covalent bonding after graft modification. Without significantly sacrificing toughness, the Young's modulus, tensile strength, and tear resistance of the material are simultaneously improved, and creep deformation is reduced. At the same time, the dense fiber network extends the diffusion paths of small molecules and gases, and the material's oxygen and moisture barrier properties are simultaneously improved, making it suitable for degradable packaging films and flexible substrate scenarios.

For rubber and elastomer systems, modified nanocellulose can be used as a green alternative filler for some carbon black and silica black, improving dynamic mechanical properties, reducing heat generation, improving flex cracking resistance, and taking into account lightweight and sustainable attributes. In light-curing resin and epoxy systems, it can also control the curing shrinkage, reduce product warpage defects, and improve dimensional stability.

Native nanocellulose is highly hydrophilic and can easily agglomerate when directly mixed into non-polar resin. Through surface hydrophobic modification, we optimize the interfacial compatibility between nanocellulose and hydrophobic matrices such as polyolefins and rubbers, solve dispersion problems, and adapt to industrial processing routes such as wet blending, solution casting, and masterbatch granulation.

Tianlu nano supporting solutions

Nanjing Tianlu Nanotechnology focuses on coatings and polymer composite materials. It can provide standardized nanocellulose suspensions with different carboxyl contents and different fiber aspect ratios, as well as hydrophobically modified and low-agglomeration customized brands to meet customer formulation development and mass production needs. Coating end: Provides rheological, high water retention, and highly reinforced CNF , supports small sample trial preparation and rheological curve testing, and assists customers in optimizing anti-settling, sagging, and film-forming effects; Polymer composite end: Provides modified nanocellulose suitable for resin blending and masterbatch preparation, with supporting dispersion process guidance to solve agglomeration, poor interface bonding, and processing adaptation problems; Targeted formula development can be carried out based on customer base materials, processing methods, strength, barrier, weather resistance, rheology and other performance indicators, and a stable supply chain can be opened from small trials, pilot trials to industrialization.

We adhere to the path of high-value biomass and use low-added, high-performance, low-carbon and traceable nanocellulose materials to help coating and polymer material companies achieve environmentally friendly formula upgrades and product performance iterations, and create differentiated competitiveness in the direction of plastic reduction, VOC reduction , and substitution of fossil-based additives.

If you need samples, formula testing, or modified customized solutions, please contact our technical team for docking.