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

Inactive Publication Date: 2007-08-01
DEGUSSA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, however, the water dilutability of this sol-gel system is only limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The present invention provides a sol-gel composition which is dilutable with water in any proportion and is based on the reaction of at least the following components: (i) a glycidyloxypropylalkoxysilane, (ii) an aqueous silica sol having a solids content of > 1% by weight, (iii)an organic acid as hydrolysis catalyst, and (iv) n-propyl zirconate, butyl titanate or titanium acetylacetonate as crosslinker, starting from a mass ratio of the solids mass of component (ii) to component (i) <= 0.75, a process for preparing it and its use, in particular as a sol-gel composition for corrosion control coatings, a corresponding corrosion control coat or primer coat, and articles equipped with such a coating.

Description

technical field [0001] The present invention relates to specific aqueous compositions based on silane and silicic acid sols by the sol-gel process, their preparation and their use. Background technique [0002] There is increasing interest in the use of silanes as starting materials in the production of nanocomposites using the sol-gel process, including EP 1 288 245A, EP 0 982 348A, DE 19816 136A, WO 99 / 036359. Such nanocomposites are often used as coatings in a wide variety of applications. [0003] A common and major disadvantage of known coating systems based on sol-gel formulations is the presence of chlorides and high proportions of organics, mostly volatiles, and toxic solvents, which are either by-products of hydrolysis of silanes or added as diluents . The amount of water used was insufficient to achieve complete hydrolysis of the silane, and the use of an acidic hydrolysis catalyst resulted in a resulting solvent-containing sol-gel system that was stable on shelf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/00C09D183/00C09D5/08D21H19/00D21J1/08C08J7/04B05D7/06B05D7/14C09K23/54
CPCC09D5/08C23C2222/20Y10T428/31663C09D183/14C09D4/00B05D5/00C08G77/14C08K3/36C09D183/06D21H19/32C08G77/04C09D183/04
Inventor B·斯坦德克C·瓦斯默P·珍克纳
Owner DEGUSSA AG
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