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A kind of water-soluble high temperature resistant sealing agent and preparation method thereof
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A technology of high temperature resistance and sealing agent, applied in the direction of coating, etc., can solve the problems of reducing water resistance, poor film formation, poor metal salt spray resistance, etc., to achieve protective coating and passivation layer, high hardness and stability, reaction mild conditions
Active Publication Date: 2021-11-23
德锡化学(山东)有限公司
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Problems solved by technology
[0006] 1) Poor stability, prone to polycondensation and failure, especially in alkaline environments, which limits large-scale applications
[0007] 2) The wettability is not good, and the wettability of different concentrations and different types of silane hydrolyzate to the metal surface is different
[0008] 3) Poor film-forming properties. Different types of silane hydrolyzed oligomers have different curing film-forming properties, and most of them show poor toughness and easy cracking of the film layer.
If it is applied to metal surface treatment, the salt spray resistance of the treated metal is relatively poor, because the hydrophilic KH560 silane coupling agent has improved the stability of the hybrid solution but reduced the water resistance. The sexual reaction adopts the two-pot method, and the process is more cumbersome
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Embodiment 1
[0035] Example 1: A water-soluble high temperature resistant sealant
[0036] A method for preparing a water-soluble high-temperature-resistant sealing agent, the specific steps are as follows:
[0037] Add 50g of isopropanol and 10g of 1,2-propanediolsolvent to 40g of acidic silica sol, stir evenly and then raise the temperature to 50°C, slowly add 10g of 3-(2,3-epoxypropoxy)propyl trimethyl Oxysilane, after dripping, slowly add 4g of methyltriethoxysilane, react for 5 hours, add 0.01g of BASF wetting agent Lutensol TO5 after cooling, and stir evenly to obtain a transparent, colorless, water-soluble high-temperature resistant sealant.
Embodiment 2
[0038] Example 2: A water-soluble high temperature resistant sealant
[0039] A method for preparing a water-soluble high-temperature-resistant sealing agent, the specific steps are as follows:
[0040] Add 50g of isopropanol and 10g of 1,2-propanediolsolvent to 40g of acidic silica sol, stir evenly and then raise the temperature to 50°C, slowly add 10g of 3-(2,3-epoxypropoxy)propyl trimethyl Oxysilane, after dripping, slowly add 6g of methyltriethoxysilane, react for 5 hours, add 0.01g of BASF wetting agent Lutensol TO5 after cooling, and stir evenly to obtain a transparent, colorless, water-soluble high-temperature resistant sealant.
Embodiment 3
[0041] Example 3: A water-soluble high temperature resistant sealant
[0042] A method for preparing a water-soluble high-temperature-resistant sealing agent, the specific steps are as follows:
[0043] Add 60g of isopropanol and 10g of 1,2-propanediol solvent to 30g of acidic silica sol, stir evenly and then raise the temperature to 50°C, slowly drop in 10g of 3-(2,3-glycidoxy)propyltrimethyl Oxysilane, after dripping, slowly add 6g of dodecyltrimethoxysilane, react for 5 hours, add 0.01g of BASF wetting agent Lutensol TO5 after cooling, and stir evenly to obtain a transparent, colorless, water-soluble high-temperature resistant sealant.
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Abstract
The invention discloses a water-soluble high-temperature-resistant sealing agent and a preparation method thereof, and mainly relates to the technical field of after-treatment of galvanized alloys. The sealing agent is prepared by the following method: Add co-solvent and silanehydrolysis inhibitor successively to the acidic nano-silica sol, stir evenly; raise the temperature to 30-60°C, add hydrophilic silanecoupling dropwise at a rate of 1-2ml / min agent, then add hydrophobic and heat-resistant silanecoupling agent dropwise at a rate of 1-2ml / min, react for 4-8 hours, cool to room temperature ℃, add wetting agent, and mix well. The beneficial effect of the invention is that it is a water-soluble stable sealing agent that can withstand high temperature of 250 DEG C without yellowing, and can protect the metalcoating and passivation layer in the hydrogen removal process.
Description
technical field [0001] The invention relates to the technical field of post-treatment of galvanized alloys, in particular to a water-soluble high-temperature-resistant sealant and a preparation method thereof. Background technique [0002] During the electroplating process, the metal ions to be plated get electrons on the cathode, and hydrogen ions also get electrons to generate atomic hydrogen. The atomic hydrogen penetrates into the metal, causing the coating to be loose. After a period of time, the atomic hydrogen will combine to form hydrogen and expand in volume, which will cause undesirable defects such as pinholes, bubbling, and even shedding of the coating. If it penetrates into the substrate, it will Will lead to hydrogen embrittlement of the entire component. Hydrogenembrittlement is one of the most serious quality hazards in surface treatment. Parts with severe hydrogen embrittlement may break during use, causing serious accidents. Therefore, hydrogen embrittle...
Claims
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