CN114605264A - Rust conversion agent prepared from gallic acid as raw material and application thereof - Google Patents
Rust conversion agent prepared from gallic acid as raw material and application thereof Download PDFInfo
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- CN114605264A CN114605264A CN202011430943.XA CN202011430943A CN114605264A CN 114605264 A CN114605264 A CN 114605264A CN 202011430943 A CN202011430943 A CN 202011430943A CN 114605264 A CN114605264 A CN 114605264A
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 45
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 32
- 235000004515 gallic acid Nutrition 0.000 title claims abstract description 17
- 229940074391 gallic acid Drugs 0.000 title claims abstract description 17
- 239000002994 raw material Substances 0.000 title abstract description 4
- -1 3-hydroxybutyl 3,4, 5-trihydroxybenzoate Chemical group 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims description 45
- 239000011248 coating agent Substances 0.000 claims description 39
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 27
- 239000003822 epoxy resin Substances 0.000 claims description 26
- 229920000647 polyepoxide Polymers 0.000 claims description 26
- 150000001875 compounds Chemical class 0.000 claims description 23
- 239000003973 paint Substances 0.000 claims description 16
- OWBTYPJTUOEWEK-UHFFFAOYSA-N butane-2,3-diol Chemical compound CC(O)C(C)O OWBTYPJTUOEWEK-UHFFFAOYSA-N 0.000 claims description 15
- YSUQLAYJZDEMOT-UHFFFAOYSA-N 2-(butoxymethyl)oxirane Chemical compound CCCCOCC1CO1 YSUQLAYJZDEMOT-UHFFFAOYSA-N 0.000 claims description 13
- 239000002518 antifoaming agent Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical group CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 11
- 239000007822 coupling agent Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 2
- 230000003197 catalytic effect Effects 0.000 claims 1
- 238000003756 stirring Methods 0.000 description 31
- 238000007739 conversion coating Methods 0.000 description 26
- 238000012360 testing method Methods 0.000 description 26
- 239000000203 mixture Substances 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 8
- 239000007921 spray Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 description 5
- 239000001263 FEMA 3042 Substances 0.000 description 5
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 description 5
- 239000008199 coating composition Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 238000005536 corrosion prevention Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 235000015523 tannic acid Nutrition 0.000 description 5
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 5
- 229940033123 tannic acid Drugs 0.000 description 5
- 229920002258 tannic acid Polymers 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 150000007522 mineralic acids Chemical class 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/76—Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring
- C07C69/84—Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring of monocyclic hydroxy carboxylic acids, the hydroxy groups and the carboxyl groups of which are bound to carbon atoms of a six-membered aromatic ring
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a rust conversion agent prepared by using gallic acid as a raw material and application thereof. The rust converting agent is 3-hydroxybutyl 3,4, 5-trihydroxybenzoate, and the chemical structural formula of the rust converting agent is shown in a formula 1):
Description
Technical Field
The invention provides a compound, a preparation method and application thereof, in particular to application of the compound used as a rust conversion agent.
Background
In actual working conditions, the main anticorrosion measures of metal materials are cathodic protection, coating anticorrosion and the use of chemical reagents. The corrosion prevention of the coating is to coat a corrosion-prevention insulating material on the metal surface so as to prevent the metal surface from contacting and reacting with an external corrosive medium, and the corrosion prevention is also the most basic measure in the corrosion prevention work. However, the implementation effect is not ideal and has many problems. For example, the metal surface needs to be subjected to complete rust removal treatment before coating, the construction period is long, the aging is low, and the wall thickness is easy to be reduced during the rust removal treatment, so that certain potential safety hazards exist; in addition, the equipment has a plurality of dead angles in design, and the conventional derusting equipment cannot easily reach the dead angles to carry out derusting work. Therefore, the highly efficient rust-bearing coating material can solve the above-mentioned problems.
At present, rust conversion coatings are mainly classified into three types according to their principle of action: permeable, stable or conversion, functional. The stable and permeable antirust capabilities are limited, and the antirust liquid is only suitable for steel surfaces with thin rust layers; the conversion type antirust effect is relatively good, but the conversion capability of the rust layer is also influenced by the thickness, uniformity and construction environment of the rust layer. Combining the advantages and disadvantages of the three types of rust conversion coatings, the current conversion type rust conversion coating is a hot spot of domestic and foreign research, so the selection of a rust conversion agent is emphasized.
At present, most rust converting agents mainly comprise tannic acid and phosphoric acid, but the tannic acid cannot achieve a good effect when the concentration is too high or too low, and the corrosion effect is greatly influenced by the concentration of acid in a rust converting system; phosphoric acid is a strong inorganic acid, and if residual acid still exists after rust conversion, the residual acid can permeate into the inside of the base material to cause corrosion of internal metal, so that the corrosion prevention effect of the rust conversion coating cannot be really achieved.
In addition, most of the coatings in the prior art are in a form of primer and finish, the process is complicated in the coating process, and much time is needed.
Disclosure of Invention
The invention provides a compound, which is 3-hydroxybutyl 3,4, 5-trihydroxybenzoate, and the chemical structural formula of the compound is shown in formula 1):
The second invention provides a method for preparing the compound according to the first invention, wherein the compound is obtained by reacting gallic acid and 2,3 butanediol under the catalysis of p-toluenesulfonic acid.
In one embodiment, the molar ratio of the gallic acid, the 2,3 butanediol, and the p-toluenesulfonic acid is (1-2): (5-25): 1.
in one embodiment, the reaction is carried out at 70 to 75 ℃ for 1 to 2h, then at 105 to 115 ℃ for 2.5 to 3.5 h.
The third invention provides the compound according to the first invention or the compound prepared by the method according to any one of the second invention, and the application of the compound in rust conversion.
The fourth invention provides a coating paint which comprises a component A and a component B; wherein the component A comprises a rust conversion agent, epoxy resin, butyl glycidyl ether, a coupling agent and a defoaming agent; the component B is a curing agent;
wherein the rust converting agent is a compound according to one aspect of the present invention or a compound produced by the method according to any one aspect of the second aspect of the present invention.
In one embodiment, the compound is 2% to 8%, the epoxy resin is 40% to 60%, the butyl glycidyl ether is 15% to 35%, the coupling agent is 0.1% to 1.5%, the defoamer is 0.3% to 2.5%, and the curing agent is 12% to 30% based on 100% of the total mass of the coating paint.
In one embodiment, the epoxy resin is epoxy E-51.
In one embodiment, the coupling agent is 3-aminopropyltriethoxysilane.
In one embodiment, the antifoaming agent is YL-868.
In one embodiment, the curing agent is phenolic amine epoxy resin T-31.
The invention has the beneficial effects that:
the rust conversion coating of the invention does not distinguish the primer and the finish paint, but mixes all the raw materials together, thereby obtaining the integrated rust conversion anticorrosive coating, and the coating can be completed only by one time, thereby the coating process is simpler and the time is saved. The rust conversion coating paint provided by the invention also has good adhesion and impact resistance, and can resist corrosion of salt water.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary of the invention and are not to be construed as limiting the invention in any way.
Preparation of rust conversion agent
Example 1
(1) Accurately weighing 2, 3-butanediol, gallic acid and p-toluenesulfonic acid in a molar ratio of 25:1.67:1 into different beakers respectively;
(2) pouring gallic acid, 2, 3-butanediol and p-toluenesulfonic acid into a flask for oil bath heating, stirring at the rotating speed of 200rpm, raising the oil bath temperature to 70 ℃ for reaction for 1h, and then raising the temperature to 105 ℃ for reaction for 2.5h to obtain a compound, namely the rust converting agent;
(3) cooling to 25 deg.C, sealing and storing.
Example 2
(1) Accurately weighing 2, 3-butanediol, gallic acid and p-toluenesulfonic acid in a molar ratio of 14:1.4:1 into different beakers respectively;
(2) pouring gallic acid, 2, 3-butanediol and p-toluenesulfonic acid into a flask for oil bath heating, stirring at the rotating speed of 200rpm, raising the oil bath temperature to 70 ℃ for reaction for 1h, and then raising the temperature to 105 ℃ for reaction for 3.5h to obtain a compound, namely the rust converting agent;
(3) cooling to 25 deg.C, sealing and storing.
Example 3
(1) Accurately weighing 2, 3-butanediol, gallic acid and p-toluenesulfonic acid in a molar ratio of 15:1:1 into different beakers respectively;
(2) pouring gallic acid, 2, 3-butanediol and p-toluenesulfonic acid into a flask for oil bath heating, stirring at the rotating speed of 200rpm, raising the oil bath temperature to 75 ℃ for reaction for 1h, and then raising the temperature to 115 ℃ for reaction for 2.5h to obtain a compound, namely the rust converting agent;
(3) cooling to 25 deg.C, sealing and storing.
Example 4
(1) Accurately weighing 2, 3-butanediol, gallic acid and p-toluenesulfonic acid with a molar ratio of 7.5:1.25:1 into different beakers respectively;
(2) pouring gallic acid, 2, 3-butanediol and p-toluenesulfonic acid into a flask for oil bath heating, stirring at the rotating speed of 200rpm, raising the oil bath temperature to 75 ℃ for reaction for 1h, and then raising the temperature to 115 ℃ for reaction for 3h to obtain a compound, namely the rust converting agent;
(3) cooling to 25 deg.C, sealing and storing.
Example 5
(1) Accurately weighing 2, 3-butanediol, gallic acid and p-toluenesulfonic acid with a molar ratio of 5:2:1 into different beakers respectively;
(2) pouring gallic acid, 2, 3-butanediol and p-toluenesulfonic acid into a flask for oil bath heating, stirring at the rotating speed of 200rpm, raising the temperature of the oil bath to 70 ℃ for reaction for 2 hours, then raising the temperature to 115 ℃ for reaction for 3.5 hours, wherein the stirring rotating speed is 200rpm in the reaction process;
(3) cooling to 25 deg.C to obtain the rust converting agent, and sealing for storage.
Coating composition
Example 6
(1) Placing epoxy resin E-5148 parts by mass, butyl glycidyl ether 23 parts by mass, the rust converting agent 6 parts by mass prepared in example 3, 3-aminopropyltriethoxysilane 2 parts by mass and defoaming agent YL-868 (purchased from Jining HuaKai resin Co., Ltd.) 1 part by mass in a beaker, and stirring uniformly at 20 ℃ to obtain a first mixture;
(2) adding 20 parts by mass of curing agent phenol aldehyde amine epoxy resin T-31 (purchased from Jining Huakai resin Co., Ltd.) into the first mixture, and stirring at 180rpm to prevent bubbles from being generated;
(3) and reacting for 10min at ambient temperature to obtain the rust conversion coating.
Example 7
(1) Placing epoxy resin E-5160 parts by mass, butyl glycidyl ether 15 parts by mass, rust converting agent 2 parts by mass prepared in example 3, 3-aminopropyltriethoxysilane 0.1 part by mass and defoaming agent YL-8682.5 part by mass in a beaker, and uniformly stirring at 20 ℃ to obtain a first mixture;
(2) adding curing agent phenol aldehyde amine epoxy resin T-3120.4 parts by mass into the first mixture, and uniformly stirring at the ambient temperature, wherein the stirring speed is 180rpm, so that bubbles are prevented from being generated;
(3) reacting for 10min at ambient temperature to obtain the rust conversion coating paint.
Example 8
(1) Placing 40 parts by mass of epoxy resin E-5140, 35 parts by mass of butyl glycidyl ether, 8 parts by mass of the rust conversion agent prepared in example 3, 1.5 parts by mass of 3-aminopropyltriethoxysilane and 78 parts by mass of an antifoaming agent YL-8680.3 in a beaker, and uniformly stirring at 20 ℃ to obtain a first mixture;
(2) adding curing agent phenolic aldehyde amine epoxy resin T-3115.2 in parts by mass into the first mixture, and stirring uniformly at the ambient temperature, wherein the stirring speed is 180rpm, so that bubbles are prevented from being generated;
(3) and reacting for 10min at ambient temperature to obtain the rust conversion coating.
Example 9
(1) Placing epoxy resin E-5150 parts by mass, butyl glycidyl ether 32 parts by mass, rust converting agent 4 parts by mass prepared in example 3, 3-aminopropyltriethoxysilane 1 parts by mass and defoaming agent YL-8681 parts by mass in a beaker, and stirring uniformly at a temperature of 20 ℃ to obtain a first mixture;
(2) adding curing agent phenol aldehyde amine epoxy resin T-3112 parts by mass into the first mixture, and uniformly stirring at the ambient temperature, wherein the stirring speed is 180rpm, so that bubbles are prevented from being generated;
(3) and reacting for 10min at ambient temperature to obtain the rust conversion coating.
Example 10
(1) Placing epoxy resin E-5143 parts by mass, butyl glycidyl ether 20 parts by mass, rust converting agent 5 parts by mass prepared in example 3, 3-aminopropyltriethoxysilane 1 part by mass and defoaming agent YL-8681 part by mass in a beaker, and stirring uniformly at 20 ℃ to obtain a first mixture;
(2) adding curing agent phenolic aldehyde amine epoxy resin T-3130 parts by mass into the first mixture, and uniformly stirring at the ambient temperature, wherein the stirring speed is 180rpm, so that bubbles are prevented from being generated;
(3) and reacting for 10min at ambient temperature to obtain the rust conversion coating.
Comparative example 1
(1) Putting epoxy resin E-5150 parts by mass, butyl glycidyl ether 30 parts by mass, tannic acid 4 parts by mass, isopropanol 2 parts by mass, 3-aminopropyltriethoxysilane 1 parts by mass and defoaming agent YL-8681 parts by mass in a beaker, and uniformly stirring at the temperature of 20 ℃ to obtain a first mixture;
(2) adding curing agent phenol aldehyde amine epoxy resin T-3112 parts by mass into the first mixture, and uniformly stirring at the ambient temperature, wherein the stirring speed is 180rpm, so that bubbles are prevented from being generated;
(3) and reacting for 10min at ambient temperature to obtain the rust conversion coating.
Comparative example 2
(1) Putting epoxy resin E-5150 parts by mass, butyl glycidyl ether 32 parts by mass, tannic acid 4 parts by mass, 3-aminopropyltriethoxysilane 1 parts by mass and defoaming agent YL-8681 parts by mass in a beaker, and uniformly stirring at the temperature of 20 ℃ to obtain a first mixture;
(2) adding curing agent phenol aldehyde amine epoxy resin T-3112 parts by mass into the first mixture, and uniformly stirring at the ambient temperature, wherein the stirring speed is 180rpm, so that bubbles are prevented from being generated;
(3) and reacting for 10min at ambient temperature to obtain the rust conversion coating.
Comparative example 3
(1) Putting epoxy resin E-5150 parts by mass, butyl glycidyl ether 32 parts by mass, phosphoric acid 4 parts by mass, 3-aminopropyltriethoxysilane 1 parts by mass and defoaming agent YL-8681 parts by mass in a beaker, and uniformly stirring at the temperature of 20 ℃ to obtain a first mixture;
(2) adding curing agent phenol aldehyde amine epoxy resin T-3112 parts by mass into the first mixture, and uniformly stirring at the ambient temperature, wherein the stirring speed is 180rpm, so that bubbles are prevented from being generated;
(3) reacting for 10min at ambient temperature to obtain the rust conversion coating paint.
Comparative example 4
(1) 50 parts by mass of styrene-acrylic emulsion, 32 parts by mass of butyl glycidyl ether, 4 parts by mass of tannic acid, 1 part by mass of 3-aminopropyltriethoxysilane and 1 part by mass of defoaming agent YL-8681 are placed in a beaker and stirred uniformly at the temperature of 20 ℃ to obtain a first mixture;
(2) adding curing agent phenol aldehyde amine epoxy resin T-3112 parts by mass into the first mixture, and uniformly stirring at the ambient temperature, wherein the stirring speed is 180rpm, so that bubbles are prevented from being generated;
(3) and reacting for 10min at ambient temperature to obtain the rust conversion coating.
And (3) performance testing:
1. rust conversion agent Performance test
(1) Degree of rust conversion
The rust converting agent prepared in example 1 to example 5 was directly coated on a pre-rusted steel sheet test piece, dried at ambient temperature, and then the performance of the rust converting agent was measured by the following method.
(1) Rust conversion coating adhesion determination: the adhesion of the coating was tested with an electric paint film adhesion tester of the QFD type according to the GB/T1720-1979 standard. The test was performed as follows: after the coating is dried, the steel plate test piece is fixed on the test bed, the tip of the rotating needle penetrates through the coating to form a closed loop indicator light to be lighted, and meanwhile, when the circular rolling scribing is carried out, the tip of the rotating needle is ensured to penetrate through the coating all the time. After the scribing was completed, paint chips were removed with a soft brush, the scribing was observed with a magnifier, and then adhesion rating was performed, the results are shown in table 1.
(2) Determination of the rust conversion coating hardness: the hardness of the rust conversion coating is measured according to the GB/T6739-2006 standard, and the result is shown in the table 1.
(3) Determination of rust conversion coating impact resistance: the impact resistance of the coatings was tested with an elastic impact device of the TCJ-II type according to the GB/T1732-1993 standard. The test was performed as follows: the steel plate test piece coating is horizontally placed on a test bed upwards, a heavy hammer (1kg) is lifted to a certain height of the sliding barrel and then loosened, and the heavy hammer freely falls on the punch. Lifting the heavy hammer, taking out the steel plate test piece, and observing with a magnifier to judge whether the coating is damaged. The maximum height of the falling weight when the coating was undamaged was characterized as the impact resistance of the coating and the results are shown in Table 1.
TABLE 1
| Detecting items | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Stage of adhesion | 2 | 2 | 1 | 2 | 3 |
| Hardness (pencil method) H | 2 | 1 | 2 | 1 | 1 |
| Impact resistance/J | 3.92 | 2.94 | 5.39 | 3.43 | 2.45 |
As can be seen from table 1, example 3 performs best in adhesion, impact resistance, hardness properties, mainly due to the different yields of rust converting agent products prepared in examples 1 to 5 due to the high and low levels of 2,3 butanediol.
2. Performance testing of coating compositions
The coating paint compositions prepared in examples 6 to 10 and comparative examples 1 to 4 were directly coated on pre-rusted steel sheet test pieces, dried at ambient temperature, and then the properties of the coating paint compositions were measured by the following methods.
(1) Determination of the drying time of the rust conversion coating: the drying time of the coating is divided into surface drying time and actual drying time, the curing time of the coating tested by the experiment is actual drying time, and the test is specifically carried out as follows: placing a piece of standard weight of 75g/cm on the coating2And (3) turning the steel plate test piece by using qualitative filter paper of 15 multiplied by 15cm for 30 seconds, wherein the filter paper can freely fall, and the coating is completely dried.
(2) Rust conversion coating adhesion determination: the adhesion of the coating was tested with an electric paint film adhesion tester of the QFD type according to the GB/T1720-1979 standard. The test was performed as follows: after the coating is dried, the steel plate test piece is fixed on the test bed, the tip of the rotating needle penetrates through the coating to form a closed loop indicator light to be lighted, and meanwhile, when the circular rolling scribing is carried out, the tip of the rotating needle is ensured to penetrate through the coating all the time. After the scribing was completed, paint chips were removed with a soft brush, the scribing was observed with a magnifier, and then adhesion rating was performed, the results are shown in table 2.
(2) Determination of the hardness of the rust conversion coating: the hardness of the rust conversion coating was determined according to GB/T6739-.
(3) Determination of impact resistance of rust conversion coating: the impact resistance of the coatings was tested using a TCJ-II type elastic impactor in accordance with the GB/T1732 + 1993 standard. The test was performed as follows: the steel plate test piece coating is horizontally placed on a test bed upwards, a heavy hammer (1kg) is lifted to a certain height of the sliding cylinder and then loosened, and the heavy hammer freely falls on the punch. Lifting the weight, taking out the test piece, and observing with a magnifier to judge whether the coating is damaged. The maximum height of the falling weight when the coating was undamaged is characterized as the impact resistance of the coating and the results are shown in Table 2.
(4) Rust conversion coating salt spray test: the neutral salt spray resistance of the coating was tested using a model YWX-60 salt spray box. The test was performed as follows: the test solution is 5 wt.% NaCl solution, the temperature in the salt spray box is set to 35 ℃, the temperature of the filled water is set to 40 ℃, the salt spray sedimentation amount is 1-2 mL/h, the test piece is washed by clean water after the specified test period is finished by intermittent spraying for 5s and 15s stopping, and the test piece is dried and is checked to see whether bubbles and rust occur, so that the time of the salt spray resistance is determined, and the result is shown in Table 2.
TABLE 2
As can be seen from Table 2, the properties of example 6 are best, the thickness of examples 8 and 9 is small and the curing time is longest, the thickness of example 10 is large and the curing time is shortest, and the amount of the curing agent added has an effect on the thickness of the coating and the curing time.
Compared with the coating composition prepared by the invention, in the comparative example, all performance indexes except the thickness are poorer. Of these, comparative example 4 was the worst in salt spray resistance due to the poor water resistance of the styrene-acrylic emulsion as a film-forming agent.
3. Corrosion current density of coating composition
Rust conversion coating electrochemical performance test: cutting No. 20 steel plate test piece into 1cm2The lead is welded on one surface (serving as the back surface) of the square steel sheet, and the exposed position of the lead and the whole back surface of the steel sheet are sealed by AB glue. The front surfaces of the steel sheets treated as above were coated with the compositions prepared in example 6, comparative example 1, comparative example 3 and comparative example 4, respectively, and dried at ambient temperature. The corrosion current density of the coating on the steel sheet was tested using an electrochemical workstation model CHI920D, the results of which are shown in Table 3. Wherein, the electrochemical workstation adopts a three-electrode system, and the corrosion medium is 3.5 wt% NaCl aqueous solution.
TABLE 3
| Examples | Corrosion current density Icorr (A/cm)2) |
| Example 6 | 2.349×10-9 |
| Comparative example 1 | 6.697×10-8 |
| Comparative example 3 | 5.063×10-7 |
| Comparative example 4 | 9.199×10-7 |
As can be seen from table 3, the corrosion current density of the composition of example 6 is much lower than that of the compositions of comparative examples 1, 3 and 4, indicating that the performance is superior to that of the comparative examples.
Based on the experimental results, the rust converting agent and the coating composition prepared by the invention have more excellent corrosion resistance compared with common coatings on the market.
While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that various changes can be made without departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation, material, composition of matter, and method to the essential scope and spirit of the present invention. All such modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (10)
1. A compound which is 3-hydroxybutane 3,4, 5-trihydroxybenzoate and has a chemical structural formula shown in formula 1):
2. a process for the preparation of a compound as claimed in claim 1, which is obtained by reacting gallic acid and 2,3 butanediol under the catalytic action of p-toluene sulphonic acid.
3. The process according to claim 2, wherein the molar ratio of the gallic acid, the 2,3 butanediol, and the p-toluenesulfonic acid is (1-2): (5-25): 1.
4. a process according to claim 2 or 3, characterized in that the reaction is carried out at 70 to 75 ℃ for 1 to 2h and then at 105 to 115 ℃ for 2.5 to 3.5 h.
5. Use of a compound according to claim 1 or a compound prepared by a process according to any one of claims 2 to 4 for rust conversion.
6. A coating paint comprising an a component and a B component; wherein the component A comprises a rust conversion agent, epoxy resin, butyl glycidyl ether, a coupling agent and a defoaming agent; the component B is a curing agent;
wherein the rust converting agent is a compound as defined in claim 1 or a compound prepared by the method of any one of claims 2 to 4.
7. The coating material according to claim 6, wherein the compound is 2 to 8%, the epoxy resin is 40 to 60%, the butyl glycidyl ether is 15 to 35%, the coupling agent is 0.1 to 1.5%, the defoaming agent is 0.3 to 2.5%, and the curing agent is 12 to 30% based on 100% of the total mass of the coating material.
8. The coating paint of claim 6 or 7, wherein the epoxy resin is epoxy resin E-51.
9. A coating paint as claimed in any one of claims 6 to 8, characterized in that the coupling agent is 3-aminopropyltriethoxysilane.
10. A coating paint as claimed in any one of claims 6 to 9, wherein the defoamer is YL-868 and/or the curing agent is phenolic amine epoxy resin T-31.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109877768A (en) * | 2019-04-12 | 2019-06-14 | 国网福建省电力有限公司漳州供电公司 | A kind of conducting rod clamping device |
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| CN103849862A (en) * | 2014-03-05 | 2014-06-11 | 山东科技大学 | Rust transforming agent and preparation method thereof, water-based iron rust conversion coating and preparation method thereof |
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| CN103849862A (en) * | 2014-03-05 | 2014-06-11 | 山东科技大学 | Rust transforming agent and preparation method thereof, water-based iron rust conversion coating and preparation method thereof |
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