Water dilutable sol-gel composite
A gel composition, the technology of the composition, applied in the directions of dissolution, chemical/physical process, device for coating liquid on the surface, etc., can solve the problem of limited water dilutability, etc., and achieve excellent corrosion protection properties and good water resistance. , the effect of good hardness and scratch resistance
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Embodiment 1
[0106] Preparation of sol-gel system 1
[0107] device:
[0108] Stirred reactor with distillation unit, vacuum pump
[0109] Metering device, liquid phase (sumpf-) and top thermometer.
[0110] method:
[0111] Introducing 415.6g of Dynasylan GLYMO was used as starting material and 20.6 g of acetic acid was added with stirring. Measure and add 41.1g TYZOR immediately thereafter NPZ. After 5 minutes the temperature increased by about 2-5°C. Then stir 417.0 g of Levasil in 1 minute 100S / 45% (aqueous silica sol with a solids content of 45% by weight). Ensure good stirring action. Immediately thereafter, 477.3 g of DI water was added dropwise and accelerated again. The opaque dispersion was further stirred at 75-80°C (reflux) for 2 hours when the maximum temperature was reached (about 42°C). After cooling the dispersion to a liquidus temperature of about 50°C, 356.4 g of DI water were post-metered. Methanol is then distilled off at a liquidus temperature of abo...
Embodiment 2
[0135] Water dilutability of the sol-gel systems of Example 1 and Comparative Example 1a
[0136] The products of Example 1 and Comparative Example 1a were diluted 1:1 with DI water and stored at 50°C. In the product of comparative example 1a, but not in the product of example 1, significant precipitation occurred after several days of storage.
[0137] In summary: only the product of Example 1 is stable on storage when diluted with water.
[0138] Storage-stable water-diluted products are very important for practical application in spraying and dipping if low dry layer thicknesses of 1 μm and lower are to be achieved.
Embodiment 3
[0140] Preparation of neutralized sol-gel systems
[0141] The product of Example 1 was added to a stirred vessel and washed with Dynasylan 1151 (Degussa's aqueous aminosilane hydrolyzate) continuously monitors pH. Dosing Dynasylan 1151 until the composition reaches a pH of 7. The resulting product was stable for more than 4 months when stored at room temperature. pH changes during storage. The pH was 6 at the end of the storage period.
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