Anti-fog coating comprising aqueous polymeric dispersion, crosslinker & acid or salt of polyalkylene oxide
A water-based polymer, polyalkylene oxide technology, used in polyurea/polyurethane coatings, biocide-containing paints, antifouling/underwater coatings, etc., can solve the problem of reducing the scratch resistance and chemical resistance of polyurethane surfaces. Sensitivity and durability, solvent sensitivity, flexibility and less than ideal scratch resistance
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[0127] Synthesis of nanoparticles containing PEG silane surface treatment :
[0128] For each of Preparative Examples 1-3, silica nanoparticles modified with functional silanes were prepared by slowly adding the desired amount of functional silane to the selected silica nanoparticle dispersion. The relative amounts of silica nanoparticle dispersion and functional silane are determined based on the desired equivalent surface coverage. The resulting dispersion was stirred at room temperature for 4 hours and then heated in an oven up to 65°C overnight. Table 1 below describes the silica nanoparticles, the functional silane used, and the resulting coverage percentages for each of Preparative Examples 1-3. The resulting modified nanoparticle dispersions with different particle sizes and surface coverage were used as described in the Examples below.
[0129] Table 1
[0130]
[0131] Preparative Example 4
[0132] Synthesis of Multifunctional Aziridine Crosslinker : ...
example 1
[0146] Polyurethane dispersion W835 / 140 (32% by weight, 60.9 g) was mixed with 15 g of 900-DA (30% by weight, prepared as described above in Preparative Example 5) with stirring to form a homogeneous dispersion, then 6.0 g of PZ-2382 (neat, prepared as described above in Preparative Example 4) and 18.1 g of water were added and stirred for 20 minutes until a homogeneous dispersion was obtained. The solution (30% by weight solids) was applied to a PC board by a Velmax Unislide dip coater and then cured at 110°C for 20 minutes. The resulting coated PC film exhibited "excellent" anti-fog properties (no fogging when exposed to vapor at 50°C) and good light transmittance (>90). After immersion in room temperature water for 240 hours and 96 hours in 80°C water or 120 hours in 65°C water, the coated PC boards still showed "excellent" anti-fog performance and were very durable.
example 2
[0148] Polyurethane dispersion W835 / 140 (32% by weight, 60.2 g) was mixed with 29.2 g of 900-DA (30% by weight, prepared as described above in Preparative Example 5) with stirring to form a homogeneous dispersion, Then 7.0 g of PZ-2382 (neat) and 3.6 g of water were added and stirred for 20 minutes until a homogeneous dispersion was obtained. The solution (35% by weight solids) was applied to a PC board by a Velmax Unislide dip coater and then cured at 110°C for 20 minutes. The resulting coated PC film exhibited "excellent" anti-fog properties (no fogging when exposed to vapor at 50°C) and good light transmittance (>90). After immersion in room temperature water for 240 hours and 96 hours in 80°C water or 120 hours in 65°C water, the coated PET film still showed "excellent" anti-fog performance and was very durable.
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