CN105271879A - Reinforcing steel bar corrosion inhibitor of alkanolamide series and preparation method and application of reinforcing steel bar corrosion inhibitor - Google Patents
Reinforcing steel bar corrosion inhibitor of alkanolamide series and preparation method and application of reinforcing steel bar corrosion inhibitor Download PDFInfo
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- CN105271879A CN105271879A CN201510746502.3A CN201510746502A CN105271879A CN 105271879 A CN105271879 A CN 105271879A CN 201510746502 A CN201510746502 A CN 201510746502A CN 105271879 A CN105271879 A CN 105271879A
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Abstract
The invention discloses reinforcing steel bar corrosion inhibitor of alkanolamide series and a preparation method and application of the reinforcing steel bar corrosion inhibitor. The preparation method of the reinforcing steel bar corrosion inhibitor of alkanolamide series comprises the steps of adding organic carboxylic acid or organic acyl chloride to solvent, adding alcohol amine for forming a reaction system, conducting a reaction for 3-12 hours at the temperature of 40-180 DEG C under the action of a catalyst, and obtaining the reinforcing steel bar corrosion inhibitor of alkanolamide series. The reinforcing steel bar corrosion inhibitor of alkanolamide series is simple in synthetic process and has the advantages of being efficient in corrosion inhibition, green, environmentally friendly and the like.
Description
Technical field
The invention belongs to building material technical field, relate to a kind of reinforcing steel bar corrosion inhibitor, particularly a kind of alkylolamide class reinforcing steel bar corrosion inhibitor, its preparation method and application thereof.
Background technology
The major cause that steel bar corrosion destroys as concrete structure erosion, is subjected to the extensive concern of domestic and international scientific worker.And reinforcing steel bar corrosion inhibitor by ACI (ACI) and international material and structural research test the international organizations such as federation (RILEM) be known as address this problem effectively, economic and one of method easily.
Wherein, the application of nitrites inorganic rust inhibitor comparatively early and representative, as: once reported calcium nitrite and organic amine and organic acid mixture in patent US6340438 and US5527388, the effect of collaborative resistance rust can be played, but by restrictions such as the corrosion acceleration that environmental protection and improper use cause, most of Europe country clearly forbids that it uses.
The environmental protection that organic rust inhibitor has due to it, the feature such as efficient, substitute nitrite inhibitor just gradually.US2006/0156960A1 reports a kind of organophosphate rust inhibitor.Synthetic method described in this patent is generate organophosphate by Hypophosporous Acid, 50 and polyether reactant to generate phosphoramidate with organic amine, formaldehyde reaction again.But this organophosphorus rust inhibitor flows into water body can promote body eutrophication, causes environmental pollution, not belongs to the organic rust inhibitor of complete environment-friendly type.In addition, it is organic composite that most patent mostly is several difference, as mentioned in patent US5916483 and EP34807, organic amine or hydramine and inorganic or organic acid reactant is incorporated into cement-based material and applies, and confirm that it has resistance rust effect preferably.US006174461B1 and US006342101B1 is respectively by rust inhibitor and silane, water reducer compound, and preparation becomes multi-functional rust inhibitor.This type organic adsorbs mainly through heteroatoms nitrogen-atoms, Sauerstoffatom isopolarity group and rebar surface, gets rid of the chlorion of absorption, thus plays the effect of resistance rust.But this quasi-molecule has higher saturated vapor pressure usually, highly volatile, and in use procedure, effective rate of utilization is low.And in such amino alcohol molecule, mostly only having a functional group can adsorbed with reinforcing bar, adsorption is more weak.ZL20081010234924.2 reports a kind of alkali-free non-nitrous salt reinforcing steel bar corrosion inhibitor, be mainly Zinc Gluconate, lithium silicate and ammonium benzoate and lower molecular weight (alcohol) amine mixture, the simple mixing of these materials can't have obvious enhancement to its adsorptive power separately.ZL200610044239.4 reports a kind of antirust for reinforced concrete, and it is mixed by Sodium orthomolybdate and diethylenetriamine Allyl thiourea and butynediol.Due to raw material and non-common industrial chemicals, application cost is too high.
Summary of the invention
The object of this invention is to provide a kind of New Alkanolamide class reinforcing steel bar corrosion inhibitor, its preparation method and application thereof, when described alkylolamide class reinforcing steel bar corrosion inhibitor is applied in skeleton construction, the corrosion-prevention rust-resistance performance of reinforcing bar can be significantly improved, and it is environmentally friendly, starting material are easy to get simultaneously, and application cost is lower.
The absorption that alkylolamide class material has due to himself and blocking layer group, it obtains certain application in metal inhibitor field, but yet there are no correlative study and report in the concrete system of alkalescence.Contriver, by the regulation and control of such material molecular structure and change, finds that it also has the obviously effect of corrosion inhibition under alkaline environment.Simultaneously such material is compared to organophosphorus, the environmental protection more of high-volatile organic alcohol amine, efficient.
A kind of alkylolamide class reinforcing steel bar corrosion inhibitor of the present invention is the compound with alkylolamide structure, and its structure meets following general formula:
Wherein, n=4 ~ 16, R
1=H, R
2for-CH2CH2OH ,-NHC (CH3) 2CH2OH ,-C (CH2OH) 3 ,-CH2CHCH3OH, R
1when not being H, R
1with R
2be-CH2CH2OH or-CH2CHCH3OH.
The preparation method of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor of the present invention, comprises the steps:
(1) organic carboxyl acid or organic acyl chlorides are added in solvent, mix in a kettle., add hydramine and form reaction system;
(2) under catalyst action, at temperature is 40 ~ 180 DEG C, the reaction times is 3 ~ 12h, the obtained thick product of rust inhibitor, and residual solvent, by Distillation recovery under negative pressure, obtains described alkylolamide class reinforcing steel bar corrosion inhibitor;
Described catalyzer is carbodiimide, DMAP, I-hydroxybenzotriazole, N-hydroxy-succinamide dicyclohexylcarbodiimide, 2-(7-azo benzotriazole)-N, N, N', N'-tetramethyl-urea phosphofluoric acid ester, the mixing of a kind of in benzotriazole-1-base oxygen base three (dimethylamino) phosphorus hexafluorophosphate or any two kinds, and addition is 1 ~ 10% of reactant total mass mark;
Wherein the mol ratio of organic carboxyl acid or organic acyl chlorides and hydramine is 1:1.05 ~ 1:2.
Described in step (1), solvent and reactant total mass ratio are greater than 1:1.
Described organic carboxyl acid or the preferred stearic acid of organic acyl chlorides, lauric acid, certain herbaceous plants with big flowers are sour, sad, any one or two kinds of mixing of caproic acid and acyl chlorides thereof.
When reaction system is containing organic acyl chlorides in step (1), needs first to use 20%NaOH solution washing after the obtained thick product of rust inhibitor, filter out insolubles NaCl.
Described hydramine is thanomin, diethanolamine, Tutofusin tris, 2-amino-2-methyl-1-propanol, any one or two kinds of mixing of α-amino isopropyl alcohol, diisopropanolamine (DIPA).
Described solvent is selected from any one or two kinds of mixing in toluene, dimethylbenzene, tetrahydrofuran (THF), DMF.
As mixing steel bar concrete corrosion resistant agent, alkylolamide class reinforcing steel bar corrosion inhibitor of the present invention may be used in fresh concrete or the grouting material be incorporated in mending mortar uses, the relative gelling material of described alkylolamide class reinforcing steel bar corrosion inhibitor volume in concrete is 0.05 ~ 2.0%, and preferred volume is 0.1 ~ 1.0%.
Beneficial effect of the present invention is:
(1) brand-new alkylolamide molecule is adopted to use as reinforcing steel bar corrosion inhibitor, with heteroatom groups such as multiple hydroxyl, carbonyl and amino in designed molecule, increase calculation in molecular adsorption on the one hand, on the other hand, regulated and controled by different structure heteroatom group, better can form absorption at rebar surface, improve rebar surface electrostatic double layer resistance and electric capacity, reduce the transfer of electronics, thus effectively suppress rebar surface that the redox reaction of corrosion occurs.
(2) in addition, by regulating the size of non-polar group in lipid acid, can dense barrier layer be formed, improving the hydrophobic ability of binding molecule at rebar surface.After molecular structure polar groups is adsorbed in rebar surface, non-polar hydrophobic groups is staggered is covered in rebar surface, and in minimizing environment, harmful ion is to the infiltration of rebar surface, thus improves the corrosion resistance nature of reinforcing bar further.
(3) synthesis technique of the present invention simple, implement convenient, and the alkylolamide of preparation has with low cost, environmental protection, the advantage such as efficient.
Embodiment
In order to explain enforcement of the present invention more fully, following alkylolamide class reinforcing steel bar corrosion inhibitor is provided to prepare embodiment.These embodiments are only explain, instead of limit the scope of the invention.
Embodiment 1
In reactor, add 284g stearic acid and 1000g dimethylbenzene, stir, add 120g diethanolamine, add 8g4-Dimethylamino pyridine, be warming up to 140 DEG C, reaction 10h, the obtained thick product of rust inhibitor.Vacuum distillation recycling design dimethylbenzene, obtains described novel steel bar rust resistant agent.
Embodiment 2
In reactor, add 200g lauric acid and 1200g toluene, stir, add 266g diisopropanolamine (DIPA), add 15g1-hydroxybenzotriazole, be warming up to 110 DEG C, reaction 12h, the obtained thick product of rust inhibitor.Vacuum distillation recycling design toluene, obtains described novel steel bar rust resistant agent.
Embodiment 3
Sad and the 1000g tetrahydrofuran (THF) of 200g is added in reactor, stir, add 140g thanomin, add 3.4g2-(7-azo benzotriazole)-N, N, N', N'-tetramethyl-urea phosphofluoric acid ester and 3.4g benzotriazole-1-base oxygen base three (dimethylamino) phosphorus hexafluorophosphate, be warming up to 70 DEG C, reaction 6h, the obtained thick product of rust inhibitor.Vacuum distillation recycling design toluene, obtains described novel steel bar rust resistant agent.
Embodiment 4
In reactor, add 116g caproic acid and 600gN, dinethylformamide, stir, add 168g diisopropanolamine (DIPA), add 6gN-N-Hydroxysuccinimide dicyclohexylcarbodiimide, be warming up to 160 DEG C, reaction 6h, the obtained thick product of rust inhibitor.Vacuum distillation recycling design DMF, obtains described novel steel bar rust resistant agent.
Embodiment 5
In reactor, add 162g capryl(yl)chloride and 800g toluene, stir, add 90g2-amino-2-methyl-1-propyl alcohol, add 5g carbodiimide, be warming up to 40 DEG C, reaction 6h, the obtained thick product of rust inhibitor.Use 200g20%NaOH solution washing, filter out insolubles NaCl, vacuum distillation recycling design toluene and water, obtain described novel steel bar rust resistant agent.
Embodiment 6
80g lauric acid, 90g capryl(yl)chloride and 800g toluene is added in reactor, stir, add 90g2-amino-2-methyl-1-propyl alcohol, add 8g benzotriazole-1-base oxygen base three (dimethylamino) phosphorus hexafluorophosphate, be warming up to 180 DEG C, reaction 4h, the obtained thick product of rust inhibitor.Use 200g20%NaOH solution washing, filter out insolubles NaCl, vacuum distillation recycling design toluene and water, obtain described novel steel bar rust resistant agent.
Embodiment 7
122g phenylformic acid and 700g toluene is added in reactor, stir, add 60g2-amino-2-methyl-1-propyl alcohol and 30gN, N-dimethylethanolamine, add 10g benzotriazole-1-base oxygen base three (dimethylamino) phosphorus hexafluorophosphate, be warming up to 120 DEG C, reaction 6h, the obtained thick product of rust inhibitor.Vacuum distillation recycling design toluene and water, obtain described novel steel bar rust resistant agent.
Rust inhibitor is tested reinforcing bar anticorrosion performance
Prepare saturated aqua calcis, add 0.3mol/LNaCl solution as a comparison wherein.Respectively to adding the solution system tested as reinforcing bar corrosion resistance nature of the alkylolamide class reinforcing steel bar corrosion inhibitor that obtains of embodiment that massfraction is 0.6% in comparative solution.Adopt three-electrode system to test, select cylindric Q235 reinforcing bar, around with epoxy resin enclosed, stay 1cm
2working area, with 600#, 1000#, 2000# sand papering and polishing, steeps ultrasonic 15min in acetone afterwards, is used as working electrode after drying up, and platinum electrode is done electrode, and saturated calomel electrode makes reference electrode.Test comparison solution and the polarization curve containing working electrode in the solution of different rust inhibitor, thus calculate corrosion potential and the corrosion electric current density of reinforcing bar, be designated as i respectively
0and i, according to
after 7 days, rust inhibitor is to the inhibition efficiency of reinforcing bar to calculate immersion, and test result is in table 1.
Table 1 rust inhibitor is to reinforcement corrosion inhibition
| Sample | Blank | S1 | S2 | S3 | S4 | S5 | S6 | S7 | AA |
| Current potential, mV/SCE | -498.2 | -226 | -208 | -309 | -258 | -241 | -265 | -234 | -263 |
| Corrosion current, uA/cm 2 | 6.1 | 0.17 | 0.30 | 0.24 | 0.19 | 0.20 | 0.25 | 0.18 | 1.36 |
| Resistance rust efficiency, η | - | 97.2 | 95.1 | 96.1 | 96.9 | 96.7 | 96.0 | 97.1 | 77.7 |
In table, Blank is not for add rust inhibitor reinforcing bar sample corrosion potential and corrosion electric current density, S1 to S6 is rebar surface corrosion potential and corrosion current after interpolation embodiment sample, AA adds alcamines rust inhibitor N conventional on market, reinforcing bar sample corrosion potential and corrosion electric current density after N-dimethylethanolamine, as can be seen from the test results, the embodiment of the present invention shows significantly resistance rust effect for a long time under comparatively low-dosage, higher villaumite concentration levels.Soak after 7 days, alkylolamide class rust inhibitor resistance rust efficiency is all more than 95%, and common alcamines rust inhibitor N, N-dimethylethanolamine rust inhibitor efficiency is 77.7%.Prove that alkylolamide class rust inhibitor of the present invention has obviously corrosion-suppressing effect in higher bar in chlorine salt solution, the generation of steel bar corrosion can be slowed down greatly.
Claims (9)
1. an alkylolamide class reinforcing steel bar corrosion inhibitor, is characterized in that: described reinforcing steel bar corrosion inhibitor is the compound with alkylolamide structure, and its structure meets following general formula:
Wherein, n=4 ~ 16, R
1=H, R
2for-CH2CH2OH ,-NHC (CH3) 2CH2OH ,-C (CH2OH) 3 ,-CH2CHCH3OH, R
1when not being H, R
1with R
2be-CH2CH2OH or-CH2CHCH3OH.
2. the preparation method of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor according to claim 1, is characterized in that, comprise the steps:
(1) organic carboxyl acid or organic acyl chlorides are added in solvent, mix in a kettle., add hydramine and form reaction system;
(2) under catalyst action, at temperature is 40 ~ 180 DEG C, the reaction times is 3 ~ 12h, the obtained thick product of rust inhibitor, and residual solvent, by Distillation recovery under negative pressure, obtains described alkylolamide class reinforcing steel bar corrosion inhibitor;
Described catalyzer is carbodiimide, DMAP, I-hydroxybenzotriazole, N-hydroxy-succinamide dicyclohexylcarbodiimide, 2-(7-azo benzotriazole)-N, N, N', N'-tetramethyl-urea phosphofluoric acid ester, the mixing of a kind of in benzotriazole-1-base oxygen base three (dimethylamino) phosphorus hexafluorophosphate or any two kinds, and addition is 1 ~ 10% of reactant total mass mark;
Wherein the mol ratio of organic carboxyl acid or organic acyl chlorides and hydramine is 1:1.05 ~ 1:2.
3. the preparation method of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor according to claim 2, it is characterized in that, described in step (1), solvent and reactant total mass ratio are greater than 1:1.
4. the preparation method of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor according to claim 3, is characterized in that, described organic carboxyl acid or organic acyl chlorides are that stearic acid, lauric acid, certain herbaceous plants with big flowers are sour, sad, any one or two kinds of mixing of caproic acid and acyl chlorides thereof.
5. the preparation method of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor according to claim 4, it is characterized in that, when reaction system is containing organic acyl chlorides in step (1), needs first to use 20%NaOH solution washing after the obtained thick product of rust inhibitor, filter out insolubles NaCl.
6. the preparation method of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor according to claim 5, it is characterized in that, described hydramine is thanomin, diethanolamine, Tutofusin tris, 2-amino-2-methyl-1-propanol, any one or two kinds of mixing of α-amino isopropyl alcohol, diisopropanolamine (DIPA).
7. the preparation method of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor according to claim 6, is characterized in that, described solvent is selected from any one or two kinds of mixing in toluene, dimethylbenzene, tetrahydrofuran (THF), DMF.
8. the application of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor in concrete described in any one of claim 1 to 7, is characterized in that, the relative gelling material of described alkylolamide class reinforcing steel bar corrosion inhibitor volume in concrete is 0.05 ~ 2.0%.
9. the application of a kind of alkylolamide class reinforcing steel bar corrosion inhibitor according to claim 8 in concrete, is characterized in that, the relative gelling material of described alkylolamide class reinforcing steel bar corrosion inhibitor volume in concrete is 0.1 ~ 1.0%.
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