CN115028803A - High-gloss water-based epoxy curing agent and preparation method and application thereof - Google Patents
High-gloss water-based epoxy curing agent and preparation method and application thereof Download PDFInfo
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- CN115028803A CN115028803A CN202210758144.8A CN202210758144A CN115028803A CN 115028803 A CN115028803 A CN 115028803A CN 202210758144 A CN202210758144 A CN 202210758144A CN 115028803 A CN115028803 A CN 115028803A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 239000004593 Epoxy Substances 0.000 title claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000003822 epoxy resin Substances 0.000 claims abstract description 34
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 34
- FDLQZKYLHJJBHD-UHFFFAOYSA-N [3-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC(CN)=C1 FDLQZKYLHJJBHD-UHFFFAOYSA-N 0.000 claims abstract description 29
- AOBIOSPNXBMOAT-UHFFFAOYSA-N 2-[2-(oxiran-2-ylmethoxy)ethoxymethyl]oxirane Chemical compound C1OC1COCCOCC1CO1 AOBIOSPNXBMOAT-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 20
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 20
- -1 alcohol ether compound Chemical class 0.000 claims abstract description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 239000004848 polyfunctional curative Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- CUDYYMUUJHLCGZ-UHFFFAOYSA-N 2-(2-methoxypropoxy)propan-1-ol Chemical compound COC(C)COC(C)CO CUDYYMUUJHLCGZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000006115 industrial coating Substances 0.000 claims description 4
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 claims description 3
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 claims description 3
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims 1
- 239000003973 paint Substances 0.000 abstract description 19
- 239000000758 substrate Substances 0.000 abstract description 3
- 229920006334 epoxy coating Polymers 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- LCFVJGUPQDGYKZ-UHFFFAOYSA-N Bisphenol A diglycidyl ether Chemical compound C=1C=C(OCC2OC2)C=CC=1C(C)(C)C(C=C1)=CC=C1OCC1CO1 LCFVJGUPQDGYKZ-UHFFFAOYSA-N 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- UWFRVQVNYNPBEF-UHFFFAOYSA-N 1-(2,4-dimethylphenyl)propan-1-one Chemical compound CCC(=O)C1=CC=C(C)C=C1C UWFRVQVNYNPBEF-UHFFFAOYSA-N 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 239000001120 potassium sulphate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004634 thermosetting polymer Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5033—Amines aromatic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/22—Di-epoxy compounds
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Epoxy Resins (AREA)
Abstract
The invention relates to a high-gloss water-based epoxy curing agent, a preparation method and application thereof, wherein the high-gloss water-based epoxy curing agent comprises the following components in parts by weight: 9-11 parts of m-xylylenediamine, 3-24 parts of polyethylene glycol diglycidyl ether, 513-24 parts of epoxy resin E, 0-10 parts of alcohol ether compound and 0-30 parts of water. The epoxy curing agent prepared by the invention adopts polyethylene glycol diglycidyl ether and epoxy resin E51 to modify m-xylylenediamine as a substrate, so that the problem of poor compatibility between the curing agent and the waterborne epoxy resin is solved, and the cured paint film has good glossiness.
Description
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a high-gloss water-based epoxy curing agent, and a preparation method and application thereof.
Background
Epoxy resin is a thermosetting polymer material with good adhesive force and chemical stability, and is widely used as a resin matrix of paint. The solvent type epoxy coating contains a large amount of benzene, formaldehyde and other flammable and explosive organic volatile compounds (VOCs), so that the solvent type epoxy coating has great harm to the health of operators and has great influence on social environment.
When the epoxy resin is used, a curing agent is required to be added to cause a curing reaction, and a three-dimensional network structure is generated to show excellent performance. Therefore, curing agents are indispensable in epoxy resin applications and even play a decisive role to some extent. Since downstream application requirements of epoxy coatings are various, such as long drying and activation periods of the base, salt spray performance, tolerance, coating requirements, construction requirements and the like are all related to the curing agent, the curing agent of the water-based epoxy coating should be developed according to different application occasions and performance requirements.
The normal temperature self-drying industrial coating is widely applied to various large outdoor equipment, such as the fields of rail transit, bridge protection, labels, containers, ships, terraces and the like, and is one of the coatings with the highest demand. The glossiness of the industrial coating is an important index for measuring the appearance quality of a paint film, and the high-glossiness paint film not only has beautiful appearance, but also has good protection effect on a coated object. According to the film forming mechanism of the paint, the oil paint can easily achieve a high-gloss paint surface. However, the film forming process of the water-based paint is that latex particles are extruded and fused after water is volatilized, so that the water-based paint has great difficulty in obtaining higher gloss.
The chinese patent literature discloses a high gloss self-curing epoxy resin and a preparation method thereof (application publication No. CN 113831505 a), and the prepared epoxy coating has high gloss, but needs to be cured at a high temperature of 150 ℃ to form a film, and cannot be performed at room temperature. Although the epoxy resin in the patent overcomes the defect of poor glossiness of the water-based paint after being cured, the epoxy resin can only be applied to the field of powder paint.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a high-gloss water-based epoxy curing agent, a preparation method and application thereof, and overcomes the defects that the existing curing agent has poor compatibility with water-based epoxy resin and the glossiness is insufficient after curing to form a film.
In order to solve the technical problems, the invention adopts the technical scheme that:
in a first aspect, an embodiment of the present invention provides a high gloss aqueous epoxy hardener, including, by weight:
9-11 parts of m-xylylenediamine, 3-24 parts of polyethylene glycol diglycidyl ether, 513-24 parts of epoxy resin E, 0-10 parts of alcohol ether compound and 0-30 parts of water.
According to the high-gloss water-based epoxy curing agent provided by the invention, polyethylene glycol diglycidyl ether (a hydrophilic component) and epoxy resin E51 (a lipophilic component) are adopted to modify m-xylylenediamine as a substrate, and the three components are subjected to modification proportion selection, so that the problem of poor compatibility of the curing agent and a water-based epoxy emulsion is solved, and the gloss of a paint film after curing is ensured; compared with high molecular weight epoxy resin, the epoxy resin E51 has lower molecular weight and higher aromatic ring content, and the prepared water-based curing agent is better matched with water-based epoxy resin, so that the glossiness of a paint film is better. The m-xylylenediamine can be used as an oily normal-temperature curing agent due to the aliphatic primary amino group contained in the molecular structure; however, m-xylylenediamine is not directly used in an aqueous epoxy coating system because it is not water-repellent and cannot be exposed to air for a long time. Therefore, the invention takes m-xylylenediamine as a modified substrate to ensure the curing activity of the modified curing agent at room temperature. Meanwhile, m-xylylenediamine is protected by an epoxy addition method, so that the problem of water repellency is solved, and the curing agent can be stably applied to a water-based epoxy resin coating. Wherein, the schematic diagram of the modification mechanism used in the patent is as follows:
optionally, the alcohol ether compound is one or more of propylene glycol methyl ether, propylene glycol monobutyl ether, dipropylene glycol methyl ether, ethylene glycol butyl ether and dipropylene glycol butyl ether.
According to the description, the alcohol ether compound can be used as a film forming aid of the waterborne epoxy coating, assists film forming and leveling and provides high gloss.
Alternatively, the alcohol ether compound is propylene glycol methyl ether.
Alternatively, 10 parts of m-xylylenediamine.
Alternatively, the polyethylene glycol diglycidyl ether is 5 parts to 10 parts.
Optionally, the epoxy resin E515 parts to 10 parts.
In a second aspect, an embodiment of the present invention provides a preparation method of a high gloss waterborne epoxy hardener, including the following steps:
s1: pouring m-xylylenediamine into a container, and stirring at the temperature of 20-70 ℃ under the protection of nitrogen;
s2: uniformly mixing epoxy resin E51, polyethylene glycol diglycidyl ether and an alcohol ether compound in another container at the mixing temperature of 40-70 ℃ to obtain a mixture;
s3: dropwise adding the mixture obtained in the step S2 into m-xylylenediamine at a constant speed, reacting at the temperature of 40-70 ℃, and keeping the temperature for 4-8 h;
s4: heating to 70-90 deg.c and maintaining for 0.5-2 hr before adding water.
The technical effects corresponding to the preparation method of the high-gloss water-based epoxy hardener provided by the second aspect refer to the related description of the high-gloss water-based epoxy hardener provided by the first aspect.
In a third aspect, the embodiment of the invention provides an application of a high-gloss water-based epoxy curing agent in an industrial coating.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below. It should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention discloses a high-gloss waterborne epoxy curing agent which comprises the following components in parts by weight:
9-11 parts of m-xylylenediamine, 3-24 parts of polyethylene glycol diglycidyl ether, 513-24 parts of epoxy resin E, 0-10 parts of alcohol ether compound and 0-30 parts of water. Wherein, the alcohol ether compound is one or more than two of propylene glycol methyl ether, propylene glycol monobutyl ether, dipropylene glycol methyl ether, ethylene glycol butyl ether and dipropylene glycol butyl ether.
The preparation method of the high-gloss water-based epoxy curing agent specifically comprises the following steps:
s1: pouring m-xylylenediamine into a container, and stirring at the temperature of 20-70 ℃ under the protection of nitrogen;
s2: uniformly mixing epoxy resin E51, polyethylene glycol diglycidyl ether and alcohol ether compound in another container at the temperature of 40-70 ℃ to obtain a mixture;
s3: dropwise adding the mixture obtained in the step S2 into m-xylylenediamine at a constant speed, reacting at the temperature of 40-70 ℃, and keeping the temperature for 4-8 h;
s4: heating to 70-90 deg.c and maintaining for 0.5-2 hr before adding water.
Example one
S1: introducing nitrogen into a 100ml reactor, pouring 10g of m-xylylenediamine into the reactor, and stirring at the temperature of 60 ℃;
s2: uniformly mixing 4.5g of epoxy resin E51 and 13g of polyethylene glycol diglycidyl ether in another container at the mixing temperature of 40 ℃ to obtain a mixture;
s3: dripping the mixture obtained in the step S2 into a reactor filled with m-xylylenediamine at the speed of 2 drops/second, keeping the temperature for 4 hours at the reaction temperature of 60 ℃;
s4: the temperature of the system is raised to 80 ℃ and the temperature is kept for 0.5h, 27.5g of epoxy curing agent can be obtained, the yield is 100%, the equivalent of active hydrogen is 120, the solid content is 100%, and the viscosity is 31200mPa & s (25 ℃).
Example two
S1: introducing nitrogen into a 100ml reactor, pouring 10g of m-xylylenediamine into the reactor, and stirring at the temperature of 70 ℃;
s2: uniformly mixing 8.6g of epoxy resin E51, 8.5g of polyethylene glycol diglycidyl ether and 3.5g of propylene glycol methyl ether in another container at the mixing temperature of 45 ℃ to obtain a mixture;
s3: dripping the mixture obtained in the step S2 into a reactor filled with m-xylylenediamine at the speed of 1 drop/second, keeping the temperature for 5 hours at the reaction temperature of 70 ℃;
s4: the temperature of the reaction system of S3 was raised to 85 ℃ and held for 1.5h, and 4.3g of water was added to give 34.9g of epoxy hardener with a yield of 100%, an active hydrogen equivalent of 158g/EQ, a solids content of 77.6% and a viscosity of 8930mPa · S (25 ℃).
EXAMPLE III
S1: introducing nitrogen into a 100ml reactor, pouring 10g of m-xylylenediamine into the reactor, and stirring at the temperature of 65 ℃;
s2: uniformly mixing 8.6g of epoxy resin E51, 6.4g of polyethylene glycol diglycidyl ether and 3.4g of dipropylene glycol methyl ether in another container at the mixing temperature of 55 ℃ to obtain a mixture;
s3: dripping the mixture obtained in the step S2 into a reactor filled with m-xylylenediamine at the speed of 3 drops/second, keeping the temperature at 65 ℃ for 6 hours;
s4: the temperature of the reaction system of S3 was raised to 90 ℃ and held for 1h, and 4.9g of water was added to obtain 33.3g of epoxy hardener with a yield of 100%, an active hydrogen equivalent of 146g/EQ, a solids content of 75.1% and a viscosity of 7150mPa · S (25 ℃).
Comparative example 1
S1: introducing nitrogen into a 100ml reactor, adding 10.0g of m-xylylenediamine into the reactor, and stirring at 70 ℃;
s2: weighing 25.7g of epoxy resin DGEBA (the molecular weight is 1000g/mol), 6.4g of polyethylene glycol diglycidyl ether (the molar weight of the epoxy resin and the molar weight of the polyethylene glycol diglycidyl ether are both consistent with those in the third embodiment) and 7.1g of dipropylene glycol methyl ether, uniformly mixing in another container, and controlling the temperature at 45 ℃;
s3: dripping the mixture into a reactor filled with m-xylylenediamine at the speed of 3 drops/second, controlling the system temperature at 65 ℃, and preserving the heat for 7 hours;
s4: the temperature of the S3 system is raised to 85 ℃ and kept for 1.5h, 10.5g of water is added, 59.7g of epoxy curing agent can be obtained, the yield is 100%, the equivalent weight of active hydrogen is 270g/EQ, the solid content is 70.5%, and the viscosity is 22530 mPa.s (25 ℃).
Comparative example No. two
S1: introducing nitrogen into a 100ml reactor, adding 10.0g of m-xylylenediamine into the reactor, and stirring at 70 ℃;
s2: weighing 25.7g of epoxy resin DGEBA (molecular weight is 1000g/mol), 6.4g of ethylene glycol diglycidyl ether and 7.1g of dipropylene glycol methyl ether, uniformly mixing in another container (the amounts are consistent with those in the first comparative example, and the polyethylene glycol diglycidyl ether is replaced by the ethylene glycol diglycidyl ether), and controlling the temperature at 45 ℃;
s3: dripping the mixture into a reactor filled with m-xylylenediamine at the speed of 3 drops/second, controlling the system temperature at 65 ℃, and preserving the heat for 7 hours;
s4: and (3) raising the temperature of the system of S3 to 85 ℃, preserving the heat for 1.5h, adding 10.5g of water, and obtaining a product which is whitish and has a serious water diversion phenomenon and a non-uniform stable system. Therefore, the polyethylene glycol diglycidyl ether can not be applied to the water-based epoxy coating, and the key point of the water-based modification and application of the polyethylene glycol diglycidyl ether to the water-based epoxy coating is shown.
The water-based epoxy curing agent has good dispersibility with water-based epoxy resin, and the surface drying time of a film-forming material under the condition of room temperature is less than 2 hours. The first to third examples and the first comparative example and the self-made epoxy resin are mixed according to the proportion of 1:1 to the equivalent of active hydrogen: the epoxy equivalent is proportioned, the obtained paint film is cured under the condition of room temperature (23 ℃ and humidity of 50 percent), and the performance of the obtained paint film is shown in the table I:
watch 1
The main difference between the comparative example and the third example is that high molecular weight epoxy DGEBA (molecular weight about 1000g/mol) is used instead of epoxy E51. From the results in Table I, it can be seen that the gloss of the paint film of the comparative example is lower than that of the paint films of examples one to three, and thus it can be seen that the gloss of the paint can be made higher by using the epoxy resin E51 of the present invention. Mainly because the epoxy resin E51 has higher molecular rigidity than the epoxy resin DGEBA with high molecular weight due to small molecular weight and high aromatic ring content, the prepared water-based curing agent has better molecular rigidity, is matched with the epoxy emulsion and ensures that the glossiness of a paint film is better.
The invention adopts the addition method of the epoxy compound and the polyamine compound, no by-product is generated, the purification step is not needed, the product viscosity can be adjusted, and the synthesis and preparation process is extremely simple and convenient; the modification method can solve the problem that m-xylylenediamine is not water-based, so that the curing agent can be applied to a water-based epoxy coating system, and a coating obtained by curing has excellent comprehensive performance and excellent gloss.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The high-gloss waterborne epoxy curing agent is characterized by comprising the following raw material components in parts by weight:
9-11 parts of m-xylylenediamine, 3-24 parts of polyethylene glycol diglycidyl ether, 513-24 parts of epoxy resin E, 0-10 parts of alcohol ether compound and 0-30 parts of water.
2. The high gloss waterborne epoxy hardener of claim 1, wherein: the alcohol ether compound is selected from one or more of propylene glycol methyl ether, propylene glycol monobutyl ether, dipropylene glycol methyl ether, ethylene glycol butyl ether and dipropylene glycol butyl ether.
3. The high gloss waterborne epoxy hardener of claim 1, wherein: the epoxy equivalent of the polyethylene glycol diglycidyl ether is 250-300 g/EQ.
4. The high gloss aqueous epoxy hardener of claim 1, wherein: the content of m-xylylenediamine was 10 parts.
5. The high gloss aqueous epoxy hardener of claim 1, wherein: 5-10 parts of polyethylene glycol diglycidyl ether.
6. A high gloss aqueous epoxy hardener as claimed in claim 1 or 5, wherein: 5-10 parts of epoxy resin E51.
7. A method for preparing the high gloss aqueous epoxy hardener as claimed in any one of claims 1 to 6, comprising the steps of:
s1: pouring the m-xylylenediamine into a container, and stirring under the protection of nitrogen at the temperature of 20-70 ℃;
s2: uniformly mixing the epoxy resin E51, the polyethylene glycol diglycidyl ether and the alcohol ether compound in another container at the mixing temperature of 40-70 ℃ to obtain a mixture;
s3: dropwise adding the mixture obtained in the step S2 into m-xylylenediamine at a constant speed, reacting at the temperature of 40-70 ℃, and keeping the temperature for 4-8 h;
s4: heating to 70-90 deg.c and maintaining for 0.5-2 hr before adding water.
8. The method for preparing a high gloss aqueous epoxy hardener as claimed in claim 7, wherein: the temperatures in step S1 and step S3 are 60 ℃ to 70 ℃, respectively.
9. The method for preparing a high gloss aqueous epoxy hardener as claimed in claim 7, wherein: the temperature in step S2 was 40 ℃.
10. The use of the high gloss aqueous epoxy hardener claimed in any one of claims 1 to 6 in industrial coatings.
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| CN202210758144.8A CN115028803A (en) | 2022-06-29 | 2022-06-29 | High-gloss water-based epoxy curing agent and preparation method and application thereof |
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| CN202210758144.8A CN115028803A (en) | 2022-06-29 | 2022-06-29 | High-gloss water-based epoxy curing agent and preparation method and application thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010121397A1 (en) * | 2009-04-23 | 2010-10-28 | 广州秀珀化工股份有限公司 | Water-soluble epoxy curing agent and method for preparing the same |
| CN106833294A (en) * | 2017-02-09 | 2017-06-13 | 合肥英索莱特新材料科技有限公司 | Aqueous epoxide resin paint |
| CN108864412A (en) * | 2018-07-11 | 2018-11-23 | 华南理工大学 | High-solid low-viscosity epoxy curing agent for waterborne epoxy self-leveling terrace and preparation method thereof |
| CN113754862A (en) * | 2021-09-02 | 2021-12-07 | 华南理工大学 | Non-ionic self-emulsifying water-based epoxy curing agent and preparation method and application thereof |
| US20220033569A1 (en) * | 2019-04-18 | 2022-02-03 | Wanhua Chemical Group Co., Ltd. | Ionic aqueous epoxy curing agent, preparation method therefor and use thereof |
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2022
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| WO2010121397A1 (en) * | 2009-04-23 | 2010-10-28 | 广州秀珀化工股份有限公司 | Water-soluble epoxy curing agent and method for preparing the same |
| CN106833294A (en) * | 2017-02-09 | 2017-06-13 | 合肥英索莱特新材料科技有限公司 | Aqueous epoxide resin paint |
| CN108864412A (en) * | 2018-07-11 | 2018-11-23 | 华南理工大学 | High-solid low-viscosity epoxy curing agent for waterborne epoxy self-leveling terrace and preparation method thereof |
| US20220033569A1 (en) * | 2019-04-18 | 2022-02-03 | Wanhua Chemical Group Co., Ltd. | Ionic aqueous epoxy curing agent, preparation method therefor and use thereof |
| CN113754862A (en) * | 2021-09-02 | 2021-12-07 | 华南理工大学 | Non-ionic self-emulsifying water-based epoxy curing agent and preparation method and application thereof |
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