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Organosilane coating compositions and use thereof

A coating composition and organosilane technology, applied in coatings, metal material coating processes, anti-corrosion coatings, etc., can solve problems such as high efficiency

Inactive Publication Date: 2010-12-22
DUBLIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such known systems are inferior to hexavalent chromium (Alodine TM 1200) Efficient

Method used

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  • Organosilane coating compositions and use thereof
  • Organosilane coating compositions and use thereof
  • Organosilane coating compositions and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0224] Example 1 ——Synthesis of Disubstituted Tetrazine

[0225] 1.1 Synthesis of 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine (dmptz)

[0226] The synthesis was carried out using a published three-step procedure (Codburn et al., 1991) according to the following scheme:

[0227]

[0228] 1.1.1 Synthesis of triaminoguanidine monohydrochloride

[0229] Hydrazine monohydrate was slowly added to a solution of guanidine hydrochloride (19.1 g, 0.020 mol) in 1,4-dioxane (100 ml) under stirring. The resulting mixture was heated to reflux for 2h. The resulting solution was then cooled to room temperature and the product was collected by Buchner filtration, washed with 1,4-dioxane, and dried in air. The product formed is triaminoguanidine.

[0230] 1.1.2 Synthesis of 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2-dihydro-1,2,4,5-tetrazine

[0231] To an aqueous solution (150 ml) of triaminoguanidine monohydrochloride (21.09 g, 0.15 mol) cooled in an ice bath was slowly added...

Embodiment 2

[0267] Example 2 - Formulation of sol-gels containing ligands as chelating agents

[0268] In this example, methacrylic acid (MAAH) was used as the chelating agent.

[0269] see figure 2 The flow chart:

[0270] Hydrolysis of organosilanes (A)

[0271] By using 0.01M HNO 3 Hydrolysis of organosilanes was carried out by hydrolyzing MAPTMS in aqueous solution at a volume ratio of 1:0.75 below which precipitation of zirconium species occurred during the second hydrolysis. Due to the immiscibility of MAPTMS and water, the hydrolysis proceeds in a heterogeneous manner. After stirring for 20 minutes, enough methanol had been produced to make everything present in the solution miscible.

[0272] Zirconium Chelation (B)

[0273]In order to control the hydrolytic condensation reaction, strong complexing ligands are usually used for silicate-free metal alkoxide precursors (Livage and Sanchez, 1992). Among these strong complexing ligands, MAAH can be covalently bonded to th...

Embodiment 3

[0279] Example 3 - Preparation of sol-gel containing the corrosion inhibitor as a chelating agent

[0280] In this example, DPTZ was used as the chelating agent.

[0281] see image 3 :

[0282] Organosilane hydrolysis (A)

[0283] With 0.01M HNO 3 The aqueous solution hydrolyzed MAPTMS at a volume ratio of 1:0.75 to carry out the hydrolysis of organosilanes. Due to the immiscibility of MAPTMS and water, the hydrolysis proceeds in a heterogeneous manner. After stirring for 20 minutes, enough methanol had been produced to make everything present in the solution miscible.

[0284] Zirconium Chelation (B)

[0285] to Zr(OPr) at a molar ratio of 1:1 4 DPTZ (dissolved in EtOH) was added dropwise.

[0286] Combination of organosilane and zirconium (C)

[0287] After about 45 minutes (using the concentrations above), the partially hydrolyzed MAPTMS was slowly added to the zirconate complex. This mixture was characterized by an increase in temperature, demonstrating ...

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Abstract

A sol-gel coating composition comprising a hydrolysed organosilane, an organometallic precursor and a corrosion inhibitor, wherein the corrosion inhibitor is a chelator for the organometallic precursor. The corrosion inhibitor and the organometallic precursor may form a nanoparticulate complex. The coating composition may comprise one or more additive selected from: an antimicrobial additive, a hardener, a water repelling additive, a dye, a scratch resistant additive and a flexibility enhancing additive. A process for preparing a sol gel coating composition is also described, the process comprising the steps of: hydrolysing an organosilane in the presence of a catalyst; chelating an organometallic precursor; mixing the hydrolysed silane and the chelated organometallic precursor; and hydrolysing the organosilane-organometallic precursor mixture.

Description

technical field [0001] The present invention relates to organosilane coating compositions and applications thereof. In one aspect, the coating can be considered a protective coating. Background technique [0002] Since the use of light metal alloys reduces the weight of vehicles and thereby reduces fuel consumption, light metal alloy materials have been used in the production of vehicles, for example for the automotive industry and the aerospace industry. Many of the alloys used incorporate aluminum and / or magnesium. While these alloys have excellent strength-to-weight ratios, their main disadvantages are the relative reactivity of these alloys to corrosive environments and the difficulty of maintaining a protective barrier coating. The most effective way to prevent corrosion is to coat the base metal with a material that has uniformity, good adhesion, reduced porosity and self-healing properties. [0003] In the transport industry (EuMAT, Euro Aviation, Outlook 2020, EuC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08
CPCC09C1/64C23C2222/20C01P2002/88C23C18/1204Y02T50/67C23C18/122C09D5/086C08G77/58Y10T428/31663Y02T50/60
Inventor 约翰·科尔内维布伦丹·达菲帕丁歇尔·科维拉凯特·拉贾斯·瓦尔马休·海登穆罕默德·欧巴哈
Owner DUBLIN INST OF TECH
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