以前试过的产品资料如下：
SIGNIFICANTLY IMPROVED SCRATCH RESISTANCE AND ABRASION RESISTANCE IN SOLVENT-BASED COATING SYSTEM
nanoresins applied the same principle of surface-modified nanoparticles for solvent-based coating materials. Nanopol® allows formulation of low-viscosity, sedimentation-free systems even at high filler contents.
Product overview
Improvements to properties
How it works
Application remarks
Product overview [back]
Technical data (no specification)
Type Characterization SiO2- content [wt%] Dyn. viscosity, 25°C
Nanopol ® C 784 n-Butylacetat 50 20 mPa•s
Nanopol ® C 764 Methoxypropylacetat 50 20 mPa•s
Note: Both Nanopol® C products are free from resins and additives. Further products and mixtures for special applications are available on request. Please contact our application specialists.
Improvements to properties [back]
Nanopol® C products are colloidal silica sols in various solvents. These products are low viscous and do not show sedimentation, i.e. the processability remains essentially unchanged in comparison to the respective base resin. In the ready cured film Nanopol® C products are highly transparent. In this way the specific advantages of organic and inorganic materials can be combined almost perfectly.
Important properties which can be improved in 1-part and 2-part formulations through the use of Nanopol® C are:
• Significantly improved scratch and abrasion resistance
• No reduction in transparency and gloss for the coating
• Barrier effect against gases, water vapor and solvents
• Increased weathering resistance and inhibited thermal aging
• Reduced thermal expansion and internal stresses
• Increased tear resistance, fracture toughness and modulus
• Improved adhesion to a large number of inorganic substrates (e.g. glass, aluminium)
• No adverse impact to numerous desired properties such as curing speed and prevention from sagging
• Improvement to other desired properties such as: thermal stability, stain-resistance, heat conductivity, dielectric properties
Nanopol® C is used in applications where these property improvements are desired or necessary, without compromising processability by an excessive viscosity increase (as known from e.g. fumed silica). The fact that this is possible without loss of optical clarity makes Nanopol® C particularly suitable for transparent formulations. Highly scrub resistant transparent lacquers for plastic (e.g. PC, PVC, SAN) or wood are known as examples.
How it works [back]
The nanoparticles are synthesized from aqueous sodium silicate solution in a chemical process. The dispersed phase of Nanopol® C consists of surface-modified, spherically shaped SiO2 nanoparticles with diameters of 20 nm and an very narrow particle size distribution (Fig. 1).
Figure 1: Particle size distribution (determined by SANS)
The SiO2 spheres are distributed homogenously and agglomerate-free in the resin matrix. This results in a very low viscosity of the dispersion despite SiO2 contents of up to 50 wt%.
Application remarks [back]
Nanopol® C can be used alone or as an additive in 1-part and 2-part formulations and can be cured by aliphatic isocyanate hardeners. In addition, Nanopol® C can be used in dual cure and UV-curing systems.
The required total nanosilica content in the ready formulation is dependent on the desired product properties. In general, the above-listed effects increase proportionally to the solids content. As a result, as high a SiO2 content as possible is recommended (≥ 20 wt%, corresponding to e.g. ≥ 40% Nanopol® C 784) for first screening tests. The optimum content should then be determined through systematic tests.
If necessary, additional conventional fillers (Al2O3, glass micro-pearls etc) can be used. The nanoparticles then fill the space between the micro-particles. This enables the formulator to increase the total content of inorganic fillers and thus optimise the material properties, without having to compromise the formulation viscosity.
To ensure optimum compatibility, we recommend premixing the main binder and additives (without solvents) and then adding the Nanopol® C to this mixture while stirring. Subsequently, the solvents and co-binders should be added while still stirring.
Nanopol® C products are compatible with most acrylate and polyester polyoles. Nevertheless, compatibility with the individual formulation components should be tested prior to formulation development. Nanoparticles tend to form agglomerates if their stabilization is influenced by unsuitable components. In particular, this may be the case with solvents like e.g. white spirit, xylene, benzene or toluene and certain performance additives (e.g. several lubricants, UV stabilizers and amine functional additives). A list of suitable commercial additives can be obtained from nanoresins (Technical Information “Suitable additives for Nanopol® formulations”).
For further details, please contact our application specialists.
作者: mamba 时间: 2013-6-7 12:03
榴连 发表于 2013-4-19 21:18
几年前用过类似的nanoresins AG 公司的产品，有些特殊性能，确实是好东西。例如可以增加耐磨性，可以增加耐 ...
