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Universal metallic surface silanization treating agent, preparation and use thereof

A silanization treatment, metal surface technology, applied in the direction of metal material coating process, etc., can solve problems such as failure to obtain large-scale application, economic and safety defects, changes in system components, etc., to improve practical application value, overcome Flammability and explosion hazard, strong resistance to salt spray

Inactive Publication Date: 2011-04-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong volatility and flammability of general alcohols, such as methanol, ethanol and propanol,
On the one hand, the volatilization of alcohol causes the composition of the system to change, causing the system to be unstable, and leads to a large amount of waste of alcohol; on the other hand, the system with high alcohol content is highly flammable, and the alcohol vapor content reaches a certain limit and may even cause an explosion.
In view of the disadvantages of alcohol systems in terms of economy and safety, silanization of metal surfaces has not been widely used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Take 10 volumes of organic solvent chloroform, 5 volumes of silane coupling agent vinyltriethoxysilane, inject 100 volumes of deionized water with pre-adjusted pH into the silane main body solution, mix evenly, and obtain stable complex phase system. Control the temperature of the system to react at 30° C. for 4 hours to obtain a water phase containing silanol at an appropriate concentration and an oil phase containing an unhydrolyzed silane coupling agent. Treat the surface of the carbon steel sample with an alkaline cleaning agent in the temperature range of 60-70°C for 5-30 seconds, rinse it with deionized water, dry it with compressed air, and immerse the pretreated metal directly in the water phase for 5 minute. Take it out and dry it at 80°C for 30 minutes. In the simulated seawater solution, the corrosion rate was measured by electrochemical corrosion method to be 0.0117mm / a, and the adhesion to the coating was measured by GB / T 5210-85 "Measurement o...

Embodiment 2

[0018] Example 2: Take 10 volumes of organic solvent chloroform, 5 volumes of silane coupling agent γ-aminopropyltriethoxysilane, inject 100 volumes of pre-adjusted pH deionized water into the silane main body solution, and mix evenly , to obtain a stable multiphase system. Control the temperature of the system to react at 30° C. for half an hour to obtain a water phase containing silanol at an appropriate concentration and an oil phase containing an unhydrolyzed silane coupling agent. Treat the surface of the carbon steel sample with an alkaline cleaning agent in the temperature range of 60-70°C for 5-30 seconds, rinse it with deionized water, dry it with compressed air, and immerse the pretreated metal directly in the water phase for 5 minute. Take it out and dry it at 60°C for 50 minutes. In the simulated seawater solution, the corrosion rate was measured by electrochemical corrosion method to be 0.092mm / a, and the adhesion to the coating was measured by GB / T 5210-85 "Mea...

Embodiment 3

[0019] Example 3: Take 10 volumes of organic solvent cyclohexane, 20 volumes of silane coupling agent γ-aminopropyltriethoxysilane, and 100 volumes of deionized water with pH adjusted in advance, and mix them uniformly to obtain a stable multi-phase system . Control the temperature of the system to react at 55° C. for half an hour to obtain a water phase containing silanol at an appropriate concentration and an oil phase containing an unhydrolyzed silane coupling agent. Treat the surface of the carbon steel sample with an alkaline cleaning agent at a temperature range of 60-70°C for 5-30 seconds, rinse it with deionized water, and dry it with compressed air for later use. Under the condition of stirring, add filler, acrylic resin and initiator into the water phase, and mix well. Using air as the carrier gas, spray the obtained uniform system on the pretreated metal surface, and dry it at 80°C for 30 minutes. The coating thickness is about 0.1mm. In the simulated seawater sol...

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Abstract

The invention discloses a versatile metal surface silanization treating agent, a preparing method and an application thereof. The preparing method includes steps as follows: mixing an organic solvent with 5-20 volumes and an silane coupling agent with 5-20 volumes evenly for obtaining the silane main solution, injecting a pre-adjust PH value deionized water with 100 volumes into the silane main solution for obtaining composite mixing solution; controlling temperature of the composite mixing solution in 20-60 DEG C and hydrolysis during 0.5-12 hours; cooling to a room temperature, water phase is the metal surface silanization treating agent after the solution is layered; the organic phase can supply the silane coupling agent and uses repeatedly. The treating agent, the method and the application provided by the invention have advantages of lower cost, safe in utilization, simple manufacturing equipment, convenient for use and wide metal processing range, such as steel, galvanized steel, copper, zinc, aluminium, aluminium alloy and magnesium alloy. The method has better processing effect, strong ability of hydrolytic resistance, washing resistance and salt mist resistance, longer protective period for metal, and increases and enhances fact application value of the silanization treating technique, helps the development of the metal surface silanization treating technique industrialization.

Description

technical field [0001] The invention relates to a general metal surface silanization treatment agent and its preparation method and application. Background technique [0002] There are many reports on the metal surface pretreatment agent containing silane coupling agent, such as 200510127048.X discloses a chromium-free metal surface treatment agent, which is composed of a silicon-containing binder solution containing water and / or alcohol as a solvent , the concentration of its silica component is 8-25% by weight. In particular, a metal surface treatment agent comprising an alcohol solution of an alkoxysilane oligomer having a weight average molecular weight of 1,000-10,000 obtained through alkoxysilane hydrolysis and polycondensation reaction. However, there are still problems in the practical application of this surface treatment agent containing silane coupling agent containing water and / or alcohol. One of the problems is that the silanol solution formed after silane hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/05
Inventor 何德良王名浩崔正丹徐以兵舟舟
Owner HUNAN UNIV
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