CN119684874A - Acid and alkali corrosion resistant powder coating and preparation method thereof - Google Patents
Acid and alkali corrosion resistant powder coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an acid and alkali corrosion resistant powder coating and a preparation method thereof, and relates to the field of powder coatings. Wherein the acid and alkali corrosion resistant powder coating comprises 440-450 parts by weight of bisphenol A type epoxy resin, 160-170 parts by weight of hydroxy acrylic resin, 110-120 parts by weight of isocyanate-terminated polyurethane resin, 28-33 parts by weight of aminosilane coupling agent modified filler and 80-85 parts by weight of curing agent. The acid and alkali corrosion resistant powder coating has excellent adhesion fastness to a metal substrate, has excellent acid and alkali corrosion resistant performance, can respectively resist hydrochloric acid solution with volume concentration of 5% and sodium hydroxide solution with mass concentration of 5% for more than 300 hours, and is favorable for protecting and decorating the substrate for a long time.
Description
Technical Field
The application relates to the field of powder coatings, in particular to an acid and alkali corrosion resistant powder coating and a preparation method thereof.
Background
The traditional protective coating has certain limitation in acid and alkali corrosion resistance, for example, under the long-term acid and alkali corrosion, the phenomena of foaming, peeling, color change and the like are easy to occur, so that the metal substrate is gradually lost to be protected, and corrosion damage occurs. This not only increases the maintenance and replacement costs of the equipment, but also may cause environmental pollution due to leakage of metal corrosion products, and even causes potential safety hazards.
In order to solve the acid and alkali corrosion resistance problem of the metal substrate, new protective coatings are continuously explored and developed. Powder coatings are becoming a type of environmentally friendly, highly effective coating. However, the existing powder coating has to be further improved in terms of adhesion fastness to metal substrates and acid and alkali corrosion resistance. Therefore, there is an urgent need to develop a powder coating having excellent adhesion to metal substrates and excellent acid and alkali corrosion resistance to meet the protection requirements of metal products in severe environments.
Disclosure of Invention
The application provides an acid and alkali corrosion resistant powder coating and a preparation method thereof, in order to improve the adhesion fastness of the existing powder coating to a metal substrate and the acid and alkali resistance of the powder coating.
In a first aspect, the acid and alkali corrosion resistant powder coating provided by the application adopts the following technical scheme:
The acid and alkali corrosion resistant powder coating comprises, by weight, 440-450 parts of bisphenol A type epoxy resin, 160-170 parts of hydroxy acrylic resin, 110-120 parts of isocyanate-terminated polyurethane resin, 28-33 parts of aminosilane coupling agent modified filler and 80-85 parts of curing agent.
The acid and alkali corrosion resistant powder coating is prepared from bisphenol A epoxy resin, hydroxy acrylic resin, isocyanate-terminated polyurethane resin, an amino silane coupling agent modified filler and a curing agent in a specific proportion, has excellent adhesion fastness to a metal substrate, has excellent acid and alkali corrosion resistant performance, can respectively resist a hydrochloric acid solution with a volume concentration of 5% and a sodium hydroxide solution with a mass concentration of 5% for more than 300 hours, and is favorable for protecting and decorating the substrate for a long time.
In some specific embodiments, the isocyanate-terminated polyurethane resin is prepared from polymeric glycol, double-end alcohol hydroxyl alkyl silicone oil, small-molecule glycol chain extender and diisocyanate, wherein the molar ratio of the polymeric glycol, the double-end alcohol hydroxyl alkyl silicone oil, the small-molecule glycol chain extender and the diisocyanate is (0.5-0.6): (0.1-0.2): (0.05-0.06): 1.
According to the application, the isocyanate-terminated polyurethane resin is prepared by reacting the polymeric glycol, the double-end alcohol hydroxyl alkyl silicone oil, the micromolecular glycol chain extender and the diisocyanate according to a specific molar ratio, is favorable for further improving the adhesion fastness between the powder coating and a substrate and the acid-base resistance of the powder coating, and can also maintain excellent surface quality for a thick coating film with the thickness of 150 mu m formed by the powder coating, and the coating film has no pinhole problem.
In some embodiments, the polymeric glycol comprises a non-fluoropolyether glycol and a perfluoropolyether glycol in a molar ratio of (3-4): 1.
In some embodiments, the non-fluorinated polyether diol is at least one of polypropylene glycol, polyethylene glycol, polytetrahydrofuran ether glycol.
In some specific embodiments, the perfluoropolyether diol has the formula:
wherein, the value range of m is 1-3, and the value range of n is 1-3.
In the application, when non-fluorine-containing polyether glycol, perfluoro polyether glycol, double-end alcohol hydroxyl alkyl silicone oil, micromolecular glycol chain extender and diisocyanate are adopted to prepare isocyanate-terminated polyurethane resin, the perfluoro polyether glycol with the structure can further improve the acid-base resistance of the powder coating, and meanwhile, the thick coating film with the thickness of 150 mu m formed by the powder coating can also maintain excellent surface quality, and the problem of pinholes is avoided in the coating film.
In some specific embodiments, the double-end alcohol hydroxyl alkyl silicone oil adopts double-end alcohol hydroxyl long-chain alkyl silicone oil IOTA-8865H.
In some specific embodiments, the method of preparing the isocyanate-terminated polyurethane resin includes the steps of:
heating the polymeric dihydric alcohol to 45-50 ℃ according to the proportion, then adding the double-end alcohol hydroxyl alkyl silicone oil and diisocyanate, heating to 85-115 ℃ for polymerization reaction, and then adding the micromolecular dihydric alcohol chain extender for chain extension reaction to obtain the isocyanate-terminated polyurethane resin.
In some specific embodiments, the bisphenol A type epoxy resin has an epoxy equivalent weight of 600 to 650g/eq.
In some embodiments, the curing agent is a combination of triglycidyl isocyanurate and beta-hydroxyalkylamide in a weight ratio of 1 (3-4).
In some specific embodiments, the aminosilane coupling agent modified filler is at least one of aminosilane coupling agent modified titanium dioxide, aminosilane coupling agent modified nano-silica micropowder, and aminosilane coupling agent modified nano-silica.
In a second aspect, the application provides a preparation method of an acid and alkali corrosion resistant powder coating, which comprises the following steps:
a preparation method of acid and alkali corrosion resistant powder coating comprises the following steps:
Uniformly mixing epoxy resin, hydroxy acrylic resin, isocyanate-terminated polyurethane resin, amino silane coupling agent modified filler and curing agent to obtain premix;
And (3) carrying out melt extrusion and crushing on the premix at the temperature of 90-105 ℃ to obtain the acid and alkali corrosion resistant powder coating.
According to the application, the acid-alkali corrosion resistant powder coating prepared by the method is favorable for uniformly mixing the components, and the uniformity of the acid-alkali corrosion resistant powder coating product is improved.
In summary, the application at least comprises the following beneficial technical effects:
(1) The acid and alkali corrosion resistant powder coating is prepared from bisphenol A epoxy resin, hydroxy acrylic resin, isocyanate-terminated polyurethane resin, an amino silane coupling agent modified filler and a curing agent in a specific proportion, has excellent adhesion fastness to a metal substrate, has excellent acid and alkali corrosion resistant performance, can respectively resist a hydrochloric acid solution with a volume concentration of 5% and a sodium hydroxide solution with a mass concentration of 5% for more than 300 hours, and is favorable for protecting and decorating the substrate for a long time.
(2) In the application, when non-fluorine-containing polyether glycol, perfluoro polyether glycol, double-end alcohol hydroxyl alkyl silicone oil, micromolecular glycol chain extender and diisocyanate are adopted to prepare isocyanate-terminated polyurethane resin, the perfluoro polyether glycol with the structure can further improve the acid-base resistance of the powder coating, and meanwhile, the thick coating film with the thickness of 150 mu m formed by the powder coating can also maintain excellent surface quality, and the problem of pinholes is avoided in the coating film.
Detailed Description
The application is further described below in connection with specific experiments.
Preparation example
[ PREPARATION EXAMPLE 1]
An isocyanate-terminated polyurethane resin is prepared from polytetrahydrofuran ether glycol (Korean phosphor) with a molecular weight of 1000, double-end hydroxyl long-chain alkyl silicone oil IOTA-8865H, propylene glycol, diphenylmethane diisocyanate, dibutyltin dilaurate and acetone, wherein the molar ratio of polytetrahydrofuran ether glycol, double-end hydroxyl long-chain alkyl silicone oil IOTA-8865H, propylene glycol and diphenylmethane diisocyanate is 0.5:0.2:0.06:1, the dosage of dibutyltin dilaurate is 0.01% of the weight of the diphenylmethane diisocyanate, and the dosage of acetone is 20% of the weight of the diphenylmethane diisocyanate.
In this preparation example, the preparation method of the isocyanate-terminated polyurethane resin comprises the following steps:
Heating polytetrahydrofuran ether glycol to 45 ℃ according to the proportion, then adding double-end alcohol hydroxyl long-chain alkyl silicone oil IOTA-8865H, diphenylmethane diisocyanate and dibutyltin dilaurate, heating to 85 ℃ for a prepolymerization reaction, wherein the reaction time is 3.5H, then adding acetone, stirring uniformly, then adding propylene glycol for a chain extension reaction, wherein the reaction time is 1H, finally removing the acetone, and granulating to obtain the isocyanate-terminated polyurethane resin.
[ PREPARATION EXAMPLE 2]
An isocyanate-terminated polyurethane resin is prepared from polytetrahydrofuran ether glycol (Korean phosphor) with a molecular weight of 1000, double-end hydroxyl long-chain alkyl silicone oil IOTA-8865H, propylene glycol, isophorone diisocyanate, dibutyl tin dilaurate and acetone, wherein the molar ratio of polytetrahydrofuran ether glycol, double-end hydroxyl long-chain alkyl silicone oil IOTA-8865H, propylene glycol and isophorone diisocyanate is 0.6:0.1:0.05:1, the dosage of dibutyl tin dilaurate is 0.01% of the weight of isophorone diisocyanate, and the dosage of acetone is 20% of the weight of isophorone diisocyanate.
In this preparation example, the preparation method of the isocyanate-terminated polyurethane resin comprises the following steps:
Heating polytetrahydrofuran ether glycol to 50 ℃ according to the proportion, then adding double-end alcohol hydroxyl long-chain alkyl silicone oil IOTA-8865H, isophorone diisocyanate and dibutyltin dilaurate, heating to 115 ℃ for a prepolymerization reaction, adding acetone, stirring uniformly, adding propylene glycol for a chain extension reaction, removing the acetone at last, and granulating to obtain the isocyanate-terminated polyurethane resin.
[ PREPARATION EXAMPLE 3]
An isocyanate-terminated polyurethane resin is different from [ preparation example 1 ] in that the double-ended hydroxyl long-chain alkyl silicone oil IOTA-8865H is replaced with an equimolar amount of polytetrahydrofuran ether glycol (korea phosphor) having a molecular weight of 1000.
[ PREPARATION EXAMPLE 4]
The isocyanate-terminated polyurethane resin is different from the one in preparation example 1 in that in the preparation example, the isocyanate-terminated polyurethane resin is prepared from polytetrahydrofuran ether glycol (Korean phosphor) with a molecular weight of 1000, perfluoropolyether glycol, double-end hydroxyl long-chain alkyl silicone oil IOTA-8865H, propylene glycol, diphenylmethane diisocyanate, dibutyltin dilaurate and acetone, and the molar ratio of the polytetrahydrofuran ether glycol, the perfluoropolyether glycol, the double-end hydroxyl long-chain alkyl silicone oil IOTA-8865H, propylene glycol and diphenylmethane diisocyanate is 0.375:0.125:0.2:0.06:1, wherein the perfluoropolyether glycol and the polytetrahydrofuran ether glycol are synchronously added, and the structural formula of the perfluoropolyether glycol adopted in the preparation example is as follows:
m has a value range of 1, and n has a value range of 1.
[ PREPARATION EXAMPLE 5]
The isocyanate-terminated polyurethane resin is different from the one in preparation example 1 in that in the preparation example, the isocyanate-terminated polyurethane resin is prepared from polytetrahydrofuran ether glycol (Korean phosphor) with a molecular weight of 1000, perfluoropolyether glycol, double-end hydroxyl long-chain alkyl silicone oil IOTA-8865H, propylene glycol, diphenylmethane diisocyanate, dibutyltin dilaurate and acetone, and the molar ratio of the polytetrahydrofuran ether glycol, the perfluoropolyether glycol, the double-end hydroxyl long-chain alkyl silicone oil IOTA-8865H, propylene glycol and diphenylmethane diisocyanate is 0.4:0.1:0.2:0.06:1, wherein the perfluoropolyether glycol and the polytetrahydrofuran ether glycol are synchronously added, and the structural formula of the perfluoropolyether glycol adopted in the preparation example is as follows:
m has a value range of 3, and n has a value range of 3.
[ PREPARATION EXAMPLE 6]
An isocyanate-terminated polyurethane resin differs from the one described in [ preparation 5 ] in that the perfluoropolyether diol is different. In this preparation example, the structural formula of the perfluoropolyether diol is as follows:
HOCH2CF2CF2(OCF2CF2CF2)aOCF2CF2O(CF2CF2CF2O)bCF2CF2CH2OH; In this preparation example, the value range of m is 3, and the value range of n is 3.
[ PREPARATION EXAMPLE 7 ]
An isocyanate-terminated polyurethane resin is different from [ PREPARATION EXAMPLE 5 ] in that m and n in the perfluoropolyether diol are different in value, and in this PREPARATION EXAMPLE, m is 8 and n is 8.
Examples
[ Example 1 ]
An acid and alkali corrosion resistant powder coating comprises the following raw materials:
440kg of bisphenol A epoxy resin, wherein in the embodiment, the epoxy equivalent of the bisphenol A epoxy resin is 600-650g/eq, 170kg of hydroxyl acrylic resin, and in the embodiment, the hydroxyl acrylic resin adopts Basoff Joncryl@587 hydroxyl acrylic resin;
110kg of an isocyanate-terminated urethane resin, in this example, the isocyanate-terminated urethane resin produced by [ preparation example 1 ];
28kg of aminosilane coupling agent modified filler, wherein in the embodiment, the aminosilane coupling agent modified filler adopts silane coupling agent KH550 to modify titanium pigment;
80kg of curing agent, wherein the curing agent comprises triglycidyl isocyanurate and beta-hydroxyalkylamide, and the weight ratio of the triglycidyl isocyanurate to the beta-hydroxyalkylamide is 1:3.
The preparation method of the acid and alkali corrosion resistant powder coating in the embodiment comprises the following steps:
Uniformly mixing bisphenol A type epoxy resin, hydroxy acrylic resin, isocyanate-terminated polyurethane resin, an aminosilane coupling agent modified filler and a curing agent to obtain a premix;
And (3) putting the premix into a double-screw extruder for melt extrusion and crushing to obtain the acid and alkali corrosion resistant powder coating, wherein the temperature of an extruder I area is 90-95 ℃, the temperature of an extruder II area is 90-100 ℃, the temperature of an extruder III area is 100-105 ℃, and the temperature of an extruder IV area is 100-105 ℃.
[ Example 2]
An acid and alkali corrosion resistant powder coating comprises the following raw materials:
450kg of bisphenol A type epoxy resin; in the embodiment, the epoxy equivalent of the bisphenol A type epoxy resin is 600-650g/eq, the hydroxyl acrylic resin is 160kg, and in the embodiment, the hydroxyl acrylic resin adopts Basoff Joncryl@587 hydroxyl acrylic resin;
Isocyanate-terminated polyurethane resin 120kg in this example, the isocyanate-terminated polyurethane resin prepared in [ preparation example 2 ];
33kg of aminosilane coupling agent modified filler, wherein in the embodiment, the aminosilane coupling agent modified filler adopts silane coupling agent KH550 to modify titanium pigment;
85kg of curing agent, and in the embodiment, the curing agent comprises triglycidyl isocyanurate and beta-hydroxyalkylamide, wherein the weight ratio of the triglycidyl isocyanurate to the beta-hydroxyalkylamide is 1:4.
The preparation method of the acid and alkali corrosion resistant powder coating in the embodiment comprises the following steps:
Uniformly mixing bisphenol A type epoxy resin, hydroxy acrylic resin, isocyanate-terminated polyurethane resin, an aminosilane coupling agent modified filler and a curing agent to obtain a premix;
And (3) putting the premix into a double-screw extruder for melt extrusion and crushing to obtain the acid and alkali corrosion resistant powder coating, wherein the temperature of an extruder I area is 90-95 ℃, the temperature of an extruder II area is 90-100 ℃, the temperature of an extruder III area is 100-105 ℃, and the temperature of an extruder IV area is 100-105 ℃.
[ Example 3]
An acid and alkali corrosion resistant powder coating, which differs from example 1 in that:
in this example, the isocyanate-terminated polyurethane resin obtained in [ preparation example 3 ] was used.
[ Example 4]
An acid and alkali corrosion resistant powder coating, which differs from example 1 in that:
In this example, the isocyanate-terminated polyurethane resin produced in [ preparation example 4 ] was used.
[ Example 5]
An acid and alkali corrosion resistant powder coating, which differs from example 1 in that:
In this example, the isocyanate-terminated polyurethane resin produced in [ preparation example 5] was used.
[ Example 6]
An acid and alkali corrosion resistant powder coating, which differs from example 1 in that:
In this example, the isocyanate-terminated polyurethane resin produced in [ preparation example 6] was used.
[ Example 7]
An acid and alkali corrosion resistant powder coating, which differs from example 1 in that:
In this example, the isocyanate-terminated polyurethane resin produced by [ preparation example 7 ] was used.
Comparative example
Comparative example 1
A powder coating differs from example 1 in the proportions of the raw materials of the individual components. In the comparative example, the raw materials of each component are as follows:
550kg of bisphenol A epoxy resin, in the embodiment, the epoxy equivalent of the bisphenol A epoxy resin is 600-650g/eq, 120kg of hydroxyl acrylic resin, and in the embodiment, the hydroxyl acrylic resin adopts Basoff Joncryl@587 hydroxyl acrylic resin;
isocyanate-terminated urethane resin 50kg, in this example, the isocyanate-terminated urethane resin prepared by [ preparation example 1 ];
28kg of aminosilane coupling agent modified filler, wherein in the embodiment, the aminosilane coupling agent modified filler adopts silane coupling agent KH550 to modify titanium pigment;
80kg of curing agent, wherein the curing agent comprises triglycidyl isocyanurate and beta-hydroxyalkylamide, and the weight ratio of the triglycidyl isocyanurate to the beta-hydroxyalkylamide is 1:3.
Performance test
1. Adhesive force grade, namely, spraying the prepared powder on a tinplate base material subjected to surface treatment by adopting an electrostatic spray gun, wherein the film thickness is 50 mu m, and fully curing the tinplate base material at 175 ℃ per 15min to obtain a coating film. The adhesion grade of the coating film is tested according to GB/T9286-2021 cross-cut test of paint films of color paint and varnish, and the lower the grade is, the better the adhesion fastness of the coating film and a substrate is.
2. Acid resistance, namely spraying the prepared powder on a tinplate base material subjected to surface treatment by adopting an electrostatic spray gun, wherein the film thickness is 50 mu m, and fully curing the tinplate base material at 175 ℃ for 15min to obtain the coating film. The acid resistance of the coating film was carried out according to the standard medium A method (immersion method) of GB/T9274-1988 determination of liquid Medium resistance of paint and varnish, the test liquid was specifically 5% hydrochloric acid solution by mass concentration, immersion was carried out for 300 hours, 450 hours and 600 hours, and the change of the surface of the coating film was observed.
3. Alkali resistance, namely spraying the prepared powder on a tinplate base material subjected to surface treatment by adopting an electrostatic spray gun, wherein the film thickness is 50 mu m, and fully curing the tinplate base material at 175 ℃ for 15min to obtain the coating film. The alkali resistance of the coating film was carried out according to the standard medium A method (immersion method) of GB/T9274-1988 determination of liquid medium resistance of paint and varnish, the test liquid was specifically immersed in a 5% sodium hydroxide solution for 300 hours, 450 hours and 600 hours, and the change of the surface of the coating film was observed.
4. And (3) graffiti pen test, namely spraying the prepared powder on a tinplate base material subjected to surface treatment by adopting an electrostatic spray gun, wherein the film thickness is 50 mu m, 100 mu m and 150 mu m respectively, and observing whether pinholes or shrinkage holes exist on the surface of a coating film after the coating film is fully cured at 175 ℃ per 15 min.
TABLE 1
| Sample preparation | Adhesion rating |
| Example 1 | 0 |
| Example 2 | 0 |
| Example 3 | 1 |
| Example 4 | 0 |
| Example 5 | 0 |
| Example 6 | 0 |
| Example 7 | 0 |
| Comparative example 1 | 1 |
TABLE 2
TABLE 3 Table 3
As is clear from the results of the test in comparative example 1 and examples 1 and tables 1 to 3, when the proportions of bisphenol A type epoxy resin, hydroxy acrylic resin and isocyanate-terminated polyurethane resin in comparative example 1 are out of the scope of the present application, the adhesion fastness of the powder coating to the substrate, the acid and alkali corrosion resistance of the powder coating and the surface quality of the coating film formed by the powder coating are all significantly reduced, indicating that the proportions of bisphenol A type epoxy resin, hydroxy acrylic resin and isocyanate-terminated polyurethane resin are one of the key technical features of the present application.
The results of the test conducted in examples 1 and 3 and tables 1 to 3 show that the isocyanate-terminated polyurethane resin obtained by reacting polytetrahydrofuran ether glycol, propylene glycol and isophorone diisocyanate is advantageous for further improving the adhesion between the powder coating and the substrate and the acid and alkali resistance of the powder coating, and also for a coating film having a larger thickness formed by the powder coating, excellent surface quality can be maintained, and no pinhole problem occurs in the coating film, compared with the isocyanate-terminated polyurethane resin obtained by reacting polytetrahydrofuran ether glycol, propylene glycol and isophorone diisocyanate.
The results of the tests in tables 1 to 3 are shown in combination with the test results of example 1, examples 4 to 7: when the isocyanate-terminated polyurethane resin prepared by the reaction of polytetrahydrofuran ether glycol, perfluoropolyether glycol, double-end alcohol hydroxyl long-chain alkyl silicone oil, propylene glycol and isophorone diisocyanate is adopted, the perfluoropolyether glycol preferably has the structure:
the perfluoro polyether glycol with m ranging from 1 to 3 and n ranging from 1 to 3 can further improve the acid and alkali resistance of the powder coating, and meanwhile, the coating film with larger thickness formed by the powder coating can also maintain excellent surface quality, and the problem of pinholes is avoided.
The present embodiment is merely illustrative of the present application and not limiting, and one skilled in the art, after having read the present specification, may make modifications to the embodiment without creative contribution as required, but is protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The acid and alkali corrosion resistant powder coating is characterized by comprising, by weight, 440-450 parts of bisphenol A type epoxy resin, 160-170 parts of hydroxy acrylic resin, 110-120 parts of isocyanate-terminated polyurethane resin, 28-33 parts of aminosilane coupling agent modified filler and 80-85 parts of curing agent.
2. The acid and alkali corrosion resistant powder coating according to claim 1, wherein the isocyanate-terminated polyurethane resin is prepared from polymeric glycol, double-end alcohol hydroxyl alkyl silicone oil, small-molecule glycol chain extender and diisocyanate, and the molar ratio of the polymeric glycol, the double-end alcohol hydroxyl alkyl silicone oil, the small-molecule glycol chain extender and the diisocyanate is (0.5-0.6): 0.1-0.2): 0.05-0.06): 1.
3. An acid and alkali corrosion resistant powder coating according to claim 2, wherein said polymeric glycol comprises non-fluorinated polyether glycol and perfluorinated polyether glycol in a molar ratio of (3-4): 1.
4. An acid and alkali corrosion resistant powder coating as recited in claim 3, wherein said non-fluorinated polyether glycol is at least one of polypropylene glycol, polyethylene glycol, polytetrahydrofuran ether glycol.
5. The acid and alkali corrosion resistant powder coating according to claim 3, wherein the perfluoropolyether glycol has the following structural formula:
wherein, the value range of m is 1-3, and the value range of n is 1-3.
6. The acid and alkali corrosion resistant powder coating according to claim 2, wherein the double-end alcohol hydroxyl alkyl silicone oil is double-end alcohol hydroxyl long-chain alkyl silicone oil IOTA-8865H.
7. The acid and alkali corrosion resistant powder coating according to any one of claims 2 to 6, wherein the preparation method of the isocyanate-terminated polyurethane resin comprises the following steps:
heating the polymeric dihydric alcohol to 45-50 ℃ according to the proportion, then adding the double-end alcohol hydroxyl alkyl silicone oil and diisocyanate, heating to 85-115 ℃ for polymerization reaction, and then adding the micromolecular dihydric alcohol chain extender for chain extension reaction to obtain the isocyanate-terminated polyurethane resin.
8. The acid and alkali corrosion resistant powder coating according to claim 1, wherein the bisphenol A type epoxy resin has an epoxy equivalent of 600-650g/eq.
9. An acid and alkali corrosion resistant powder coating according to claim 1, wherein the curing agent is a combination of triglycidyl isocyanurate and beta-hydroxyalkylamide, and the weight ratio of triglycidyl isocyanurate to beta-hydroxyalkylamide is 1 (3-4).
10. A process for preparing an acid and alkali corrosion resistant powder coating as claimed in any one of claims 1 to 9,
The method comprises the following steps:
Uniformly mixing bisphenol A type epoxy resin, hydroxy acrylic resin, isocyanate-terminated polyurethane resin, an aminosilane coupling agent modified filler and a curing agent to obtain a premix;
And (3) carrying out melt extrusion and crushing on the premix at the temperature of 90-105 ℃ to obtain the acid and alkali corrosion resistant powder coating.
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| CN118165622A (en) * | 2024-04-09 | 2024-06-11 | 江门市华硕科技有限公司 | A kind of corrosion-resistant epoxy resin powder coating and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1656279A (en) * | 2002-05-24 | 2005-08-17 | 3M创新有限公司 | Fluorochemical composition comprising perfluoropolyether and an extender for the treatment of fibrous substrates |
| US20080067701A1 (en) * | 2006-09-15 | 2008-03-20 | Christy Ford | Abrasion and/or Scratch Resistant Article Comprising an Impact Resistant Photochromic Polyurethane Coating, and Process of Preparation Thereof |
| CN106750432A (en) * | 2016-12-18 | 2017-05-31 | 苏州大学 | A kind of hydrophobic membrane based on fluorochemical urethane and preparation method thereof |
| CN109836559A (en) * | 2017-11-27 | 2019-06-04 | 沈阳益泰科信息咨询有限公司 | A kind of preparation method of fluorine silicon polyurethane prepolymer modified epoxy |
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