Water-soluble polyurethane corrosion inhibitor and preparation method and application thereof
A water-soluble polyurethane and corrosion inhibitor technology, applied in the field of metal anti-corrosion, can solve the problems of poor feasibility, local corrosion, large dosage, etc., and achieve the effects of simple use method, long sustained release time, and simple preparation process
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[0030] A kind of preparation method of water-soluble polyurethane corrosion inhibitor provided by an aspect of the embodiment of the present invention comprises:
[0031] Dissolving the polyethylene glycol compound in an organic solvent, adding a cyanate compound and a catalyst for a mixed reaction at 15-80°C to obtain a first reaction mixture;
[0032] Add aniline oligomers to the first reaction mixture, react at 20-100° C., and obtain the water-soluble polyurethane corrosion inhibitor after post-treatment.
[0033] Further, the preparation method includes: in parts by weight, dissolving 10-30 parts of polyethylene glycol compounds in an organic solvent, and adding 20-60 parts of cyanate compounds and 1-3 parts of catalysts, The first reaction mixture is obtained by continuously stirring at 15-80° C. for 2-4 hours; and / or, the amount of the aniline oligomer used is 10-30 parts by weight.
[0034] Further, the catalyst includes any one or a combination of two or more of triet...
Embodiment 1
[0053] Example 1 The synthetic route of a water-soluble polyurethane corrosion inhibitor provided in this example is shown in the following formula:
[0054]
[0055] Concrete, the preparation method of this water-soluble polyurethane corrosion inhibitor comprises:
[0056] Step 1: Dissolve 22.5g of polyethylene glycol 1500 in 200ml of tetrahydrofuran solution, then add 4.8g of toluene diisocyanate and a drop of stannous octoate into the above mixed solution, and stir magnetically at room temperature for 3 hours to obtain mixed solution a;
[0057] Step 2: Add 4.35g of aniline trimer to mixed solution a, react at room temperature for 3h, and precipitate the obtained product with n-hexane, and then dry it in vacuum to obtain a water-soluble polyurethane corrosion inhibitor;
[0058] Step 3: Take 1-2 mg of water-soluble polyurethane corrosion inhibitor powder and potassium bromide, mix and grind it into tablets, and test the infrared absorption spectrum on an infrared spectro...
Embodiment 2
[0059] Embodiment 2 The preparation method of the water-soluble polyurethane corrosion inhibitor of this embodiment comprises:
[0060] Step 1: Dissolve 42g of polyethylene glycol 2000 in 250ml of N,N-dimethylformamide solution, then add 7.2g of diphenylmethane diisocyanate and a drop of stannous octoate into the above mixed solution, and stir magnetically at 60°C Obtain mixed solution a after 3h;
[0061] Step 2: Add 4.35g of aniline trimer to mixed solution a, react at 60°C for 3h, and precipitate the obtained product with n-hexane, and then dry it in vacuum to obtain a water-soluble polyurethane corrosion inhibitor.
[0062] The polarization curves of carbon steel soaked in 1mol / L HCl solution containing different concentrations of water-soluble polyurethane corrosion inhibitors for 2 hours can be found in figure 2 , Nyquist diagram can refer to image 3 , SEM images can be referred to Figure 4a-Figure 4d .
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Abstract
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