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Water-dilutable sol-gel composition

A gel composition and composition technology, applied in the direction of dissolution, chemical/physical processes, and devices for coating liquids on the surface, can solve the problems of limited water dilutability, etc., and achieve excellent corrosion protection properties, good hardness and Excellent scratch resistance and water resistance

Active Publication Date: 2016-06-08
EVONIK OPERATIONS GMBH
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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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  • Water-dilutable sol-gel composition
  • Water-dilutable sol-gel composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Preparation of sol-gel system 1

[0101] device:

[0102] Stirred reactor with distillation unit, vacuum pump

[0103] Metering device, liquid phase (sumpf-) and top thermometer.

[0104] method:

[0105] Introducing 415.6g of GLYMO was used as starting material and 20.6 g of acetic acid was added with stirring. Immediately thereafter metered in 41.1 g NPZ. After 5 minutes the temperature increased by about 2-5°C. Then stir 417.0 g of 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 in. Methanol is then distilled off at a liquidus temperature of about 50-60° C. and an absolute pressure o...

Embodiment 2

[0124] Water dilutability of the sol-gel systems of Example 1 and Comparative Example 1a

[0125] 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.

[0126] In summary: only the product of Example 1 is stable on storage when diluted with water.

[0127] 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

[0129] Preparation of neutralized sol-gel systems

[0130] The product of Example 1 was added to a stirred vessel and, under thorough stirring, 1151 (Degussa's aqueous aminosilane hydrolyzate) continuously monitors pH. Dosing 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 higher than 1% by weight, (iii) an organic acid as hydrolysis catalyst, and (iv) n-propyl zirconate, butyl titanate or titanium acetylacetonate as crosslinker, wherein a mass ratio of the solids mass of component (ii) to component (i) starts from 0.75. The invention relates to a process for preparing the composition and uses of the composition, in particular as a sol-gel composition for corrosion control coatings, a corresponding corrosion control coating or primer coating, and articles equipped with the 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 growing interest in the use of silanes as starting materials in the production of nanocomposites using sol-gel methods, including EP1288245A, EP0982348A, DE19816136A, WO99 / 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 for several mon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/14C08K3/36C09D183/06C09D7/12C09D5/08B05D5/00D21H19/32C09K23/54
CPCB05D5/00C08G77/14C08K3/36C09D5/08C09D183/06D21H19/32C09D4/00C09D183/14C23C2222/20Y10T428/31663C08G77/04C09D183/04
Inventor B·斯坦德克C·瓦斯默P·珍克纳
Owner EVONIK OPERATIONS GMBH
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