CN108409932B - Preparation method of modified epoxy resin and application of modified epoxy resin in heavy-duty anticorrosive paint - Google Patents
Preparation method of modified epoxy resin and application of modified epoxy resin in heavy-duty anticorrosive paint Download PDFInfo
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Abstract
The invention discloses a preparation method of modified epoxy resin and application of the modified epoxy resin in heavy-duty anticorrosive paint. The material is used in heavy-duty anticorrosive paint, and can improve the compactness of an epoxy resin heavy-duty anticorrosive coating and the cohesiveness of film-forming resin and metal, so as to prepare anticorrosive paint with better anticorrosive performance.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a preparation method of modified epoxy resin and application of the modified epoxy resin in a heavy-duty anticorrosive coating.
Background
Public facilities and production facilities such as various large bridges, buildings, vehicles, mechanical equipment and the like constructed by steel are corroded by compounds such as water, oxygen, sulfur, chlorine and the like in nature every moment, and the economic loss caused by the rusting of the steel reaches hundreds of billions of dollars every year; in order to protect steel from corrosion, the application of anticorrosion coatings is an important measure to prevent corrosion, such as: chinese patent CN86104711 discloses an anticorrosive paint and process, which adopts epoxy modified chlorinated chloroprene rubber as main film forming material, cyclohexanone and butyl acetate as solvent, mica iron oxide and red lead powder as antirust pigment, and T31 as curing agent. The red lead powder and the zinc chromate anticorrosive pigment adopted in the invention contain lead, chromium and other heavy metals, and the solvent is used, so that the red lead powder and the zinc chromate anticorrosive pigment have great harm to human bodies and the environment.
The types of anticorrosive coatings are many, and epoxy resin has many advantages, such as high mechanical strength, good chemical stability, good electrical insulation, low shrinkage, good heat resistance, high strength, easy processing and molding and good adhesion to substrates, and is widely applied to the field of coatings. However, the epoxy resin used for preparing the anticorrosive paint has the defects of brittleness, poor impact resistance, easy aging and unsatisfactory anticorrosive performance. Therefore, it is necessary to modify the epoxy resin, and the main modification method of the epoxy resin at present is to modify the epoxy resin with polyurethane, i.e. the epoxy resin and the polyurethane form an interpenetrating network structure under appropriate conditions, so as to achieve the purpose of improving the toughness of the epoxy resin without reducing the strength and the heat resistance of the epoxy resin.
The existing polyurethane modified epoxy resin is used for preparing heavy anti-corrosion paint, has poor compactness of a coating and poor adhesion between film-forming resin and metal, and has the problem of unsatisfactory anti-corrosion performance when being used for preparing the heavy anti-corrosion paint, thereby limiting the application of the heavy anti-corrosion paint. Therefore, the technical problem to be solved at present is to prepare a novel modified epoxy resin and use the modified epoxy resin in preparation of heavy-duty anticorrosive coatings to solve the defect that the existing heavy-duty anticorrosive coatings are not ideal enough in anticorrosive performance.
Disclosure of Invention
In order to improve the compactness of the coating of the epoxy resin heavy anti-corrosion coating and the adhesion of the film-forming resin and metal and prepare the anti-corrosion coating with better anti-corrosion performance, the invention provides a modified epoxy resin which is used for preparing a solvent-free heavy anti-corrosion coating.
The specific preparation method of the modified epoxy resin comprises the following steps:
(1) according to the equivalent ratio of reactants, E-20 epoxy resin is put into a reaction kettle and stirred, and the reaction temperature is controlled as follows: dropping diethanolamine into the mixture at 130-140 ℃, and reacting for 2-4 h under heat preservation to obtain the solvent-free hydroxyl-terminated epoxy resin;
(2) cooling the solvent-free hydroxyl-terminated epoxy resin obtained in the step (1), and controlling the reaction temperature as follows: and adding aliphatic isocyanate, benzoyl chloride and diethanol amine at 50-70 ℃, reacting for 2-3 hours under heat preservation, and then adding to obtain the modified epoxy resin.
Wherein the equivalent ratio of reactants in the step (1) is as follows: the equivalent ratio of epoxy equivalent to active hydrogen of diethanolamine is: 1: 1; the equivalent ratio of OH to NCO in the step (2) is as follows: 1.8-2.0: 1; the molecular weight of the polymer can be ensured according to the equivalent ratio, so that the molecular weight of reactants is controlled within the range of 1500-2000. The technical problems of reduced salt spray resistance (strong hydrophilicity of small molecular polymers) and poor fluidity (high viscosity of macromolecules) caused by too wide molecular weight distribution range of the polymer are solved, and the guarantee is provided for the subsequent preparation of the high-performance heavy-duty anticorrosive coating. And the diethanol amine is used as a reaction terminator, so that residual aliphatic isocyanate monomers can be eliminated at the later stage of the synthesis process, and the prepared polymer has excellent stability.
In addition, the molecular structure and the molecular weight distribution of the polymer can be effectively controlled by adopting a step-by-step feeding process.
The invention also provides application of the prepared modified epoxy resin, the material is used for preparing solvent-free heavy-duty anticorrosive paint, and the preparation method comprises the following steps:
(1) preparing a component A:
① Synthesis of solvent-free hydroxyl-terminated epoxy resin:
putting low molecular liquid epoxy resin, diglycidyl ether and primary amine into a reaction kettle according to mass percentage, stirring, heating to 60-80 ℃, reacting for 2-4 h under heat preservation, cooling, and discharging to obtain the solvent-free hydroxyl-terminated epoxy resin.
Wherein the solvent-free hydroxyl-terminated epoxy resin comprises the following components in percentage by mass: low molecular liquid epoxy resin: 40-60 parts of diglycidyl ether, 15-30 parts of secondary amine and 20-30 parts of secondary monoamine.
② Pre-dispersion
Adding a dispersing agent into the solvent-free hydroxyl-terminated epoxy resin prepared in the step ① for pre-dispersion to promote the dispersion medium to quickly permeate among material particles and fully wet and coat;
wherein the dispersant is polyacrylic ammonium salt dispersant, and the dosage of the dispersant is 1-3% of the mass of the solvent-free hydroxyl-terminated epoxy resin.
③ preparation of finished product of component A:
2/3 of the total amount of the pre-dispersed solvent-free hydroxyl-terminated epoxy resin, pigment and a defoaming agent are put into a paint preparation tank, the mixture is stirred uniformly to form color paste, the color paste is dispersed by grinding equipment until the fineness of the paste is less than 15 mu m, and then the rest solvent-free hydroxyl-terminated epoxy resin, attapulgite/polyaniline filler and a catalyst are put into the color paste, and the mixture is stirred uniformly by a stirrer, filtered and packaged to obtain a component A finished product.
Wherein the pigment is one or a mixture of more than two of 800-mesh zinc phosphate, 1250-mesh aluminum tripolyphosphate or 1000-mesh mica iron oxide, and the dosage of the pigment is as follows: 5-10% of the mass of the solvent-free hydroxyl-terminated epoxy resin;
the defoaming agent is a defoaming polymer solution without organic silicon, and the dosage of the defoaming agent is as follows: 0.2-0.5% of the mass of the solvent-free hydroxyl-terminated epoxy resin;
the dosage of the attapulgite/polyaniline filler is 10-15% of the mass of the solvent-free hydroxyl-terminated epoxy resin;
the catalyst is dimethylethanolamine or methyldiethanolamine, and the dosage of the dimethylethanolamine or methyldiethanolamine accounts for 0.1-0.3 percent of the mass of the solvent-free hydroxyl-terminated epoxy resin;
the grinding equipment adopts a novel high-efficiency alloy horizontal sand mill, the matched superhard ceramic zirconium beads are used as grinding media, and a serial continuous production process of a plurality of sand mills is adopted to ensure that agglomerated particles are quickly dispersed and reduced into primary particles.
(2) Preparing a component B: namely the modified epoxy resin of the invention.
(3) Preparing a solvent-free heavy-duty anticorrosive coating: and mixing the component A finished product and the component B finished product according to the mass ratio of 3:1, and uniformly stirring to obtain the solvent-free heavy-duty anticorrosive paint.
The construction is carried out by adopting a brush coating or roller coating method, and the solvent-free attapulgite/polyaniline heavy anti-corrosion coating is formed after the coating is naturally dried at normal temperature.
Has the advantages that:
(1) according to the invention, aliphatic isocyanate is adopted to replace aromatic isocyanate, and the excellent ultraviolet resistance and toughness of the aliphatic isocyanate are utilized to improve the anticorrosion effect of the heavy-duty anticorrosive coating.
(2) Because diethanolamine and polyaniline have good compatibility, the storage stability of the coating can be improved, polyaniline can be tightly adsorbed on the surface of steel and produces redox reaction with the steel and forms a compact passivation protective layer, and the corrosion resistance of the coating is further improved;
(3) the control of the equivalent ratio of the reaction raw materials can ensure the molecular weight of the polymer, and solves the technical problems of reduced salt spray resistance and poor fluidity caused by the wide distribution range of the molecular weight of the polymer.
(4) The method adopts a pre-dispersion process, and combines measures of removing water and air absorbed by the material in vacuum, and the like to promote the dispersion medium to quickly permeate among material particles and fully wet and coat the material particles; improves the dispersion stability of the material in the coating and solves the problem of secondary agglomeration and coarseness of the material caused by large surface free energy.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in more detail below with reference to the following examples:
example 1
(1) Preparing a component A:
① Synthesis of solvent-free hydroxyl-terminated epoxy resin:
putting 45 parts of low-molecular-weight liquid epoxy resin, 25 parts of diglycidyl ether and 30 parts of secondary monoamine into a reaction kettle, stirring, heating to 80 ℃, keeping the temperature for reaction for 3 hours, cooling, and discharging to obtain the solvent-free hydroxyl-terminated epoxy resin.
② Pre-dispersion
And (3) adding 1 part of polyacrylic ammonium salt dispersing agent into the solvent-free hydroxyl-terminated epoxy resin prepared in the step ① for pre-dispersion.
③ preparation of finished product of component A:
2/3 parts of solvent-free hydroxyl-terminated epoxy resin, 5 parts of zinc phosphate of 800 meshes and 0.2 part of BYK-051 defoaming agent of Picko chemistry are uniformly stirred to form color paste, a high-efficiency alloy horizontal sand mill is used, matched superhard ceramic zirconium beads are used as grinding media, the color paste is dispersed until the fineness of the color paste is less than 15 mu m, then the rest solvent-free hydroxyl-terminated epoxy resin, 10 parts of attapulgite/polyaniline filler and 0.1 part of dimethyl ethanol ammonia catalyst are put into the color paste, and are fully stirred by a stirrer, filtered and packaged to obtain a component A finished product.
(2) Preparing a component B: the equivalent ratio of epoxy equivalent to active hydrogen of diethanolamine is as follows: 1: 1, putting the E-20 epoxy resin into a reaction kettle, stirring, and controlling the reaction temperature as follows: dropping diethanolamine into the mixture at 130 ℃, and reacting for 2 hours under heat preservation to obtain the solvent-free hydroxyl-terminated epoxy resin; cooling, and controlling the reaction temperature as follows: at 60 ℃, the equivalent ratio of OH to NCO is: 1.8: adding aliphatic isocyanate and diethanol amine into the mixture according to the equivalent ratio of 1, adding 0.005 part of benzoyl chloride, and carrying out heat preservation reaction for 2 hours to obtain the modified epoxy resin.
The construction is carried out by adopting a brush coating method, and the solvent-free attapulgite/polyaniline heavy-duty anticorrosive coating is formed after the coating is naturally dried at normal temperature.
Example 2
(1) Preparing a component A:
① Synthesis of solvent-free hydroxyl-terminated epoxy resin:
putting 55 parts of low-molecular-weight liquid epoxy resin, 25 parts of diglycidyl ether and 20 parts of secondary monoamine into a reaction kettle, stirring, heating to 70 ℃, keeping the temperature for reaction for 3 hours, cooling, and discharging to obtain the solvent-free hydroxyl-terminated epoxy resin.
② Pre-dispersion
And (3) adding 1.5 parts of polyacrylic ammonium salt dispersing agent into the solvent-free hydroxyl-terminated epoxy resin prepared in the step ① for pre-dispersion.
③ preparation of finished product of component A:
2/3 parts of aluminum tripolyphosphate with 1250 meshes and 0.2 part of BYK-051 defoaming agent with Pico chemistry of the total amount of the pre-dispersed solvent-free hydroxyl-terminated epoxy resin are uniformly stirred to form color paste, a high-efficiency alloy horizontal sand mill is used, matched superhard ceramic zirconium beads are used as grinding media, the color paste is dispersed until the fineness of the paste is less than 15 mu m, then the residual solvent-free hydroxyl-terminated epoxy resin, 12 parts of attapulgite/polyaniline filler and 0.1 part of dimethyl ethanol ammonia catalyst are put into the color paste, and are fully stirred by a stirrer, filtered and packaged to obtain a component A finished product.
(2) Preparing a component B: the same as in example 1.
(3) Preparing a solvent-free heavy-duty anticorrosive coating: and mixing the component A finished product and the component B finished product according to the mass ratio of 3:1, and uniformly stirring to obtain the solvent-free attapulgite/polyaniline heavy-duty anticorrosive paint.
The construction is carried out by adopting a roll coating method, and the solvent-free attapulgite/polyaniline heavy-duty anticorrosive coating is formed after the coating is naturally dried at normal temperature.
Example 3
(1) The component A is prepared by the following steps:
① Synthesis of solvent-free hydroxyl-terminated epoxy resin:
and (3) putting 60 parts of low-molecular-weight liquid epoxy resin, 20 parts of diglycidyl ether and 20 parts of secondary monoamine into a reaction kettle, stirring, heating to 65 ℃, keeping the temperature for reaction for 3 hours, cooling, and discharging to obtain the solvent-free hydroxyl-terminated epoxy resin.
② Pre-dispersion
And (3) adding 1.5 parts of polyacrylic ammonium salt dispersing agent into the solvent-free hydroxyl-terminated epoxy resin prepared in the step ① for pre-dispersion.
③ preparation of finished product of component A:
2/3 parts of aluminum tripolyphosphate with 1250 meshes and 0.2 part of BYK-051 defoaming agent with Pico chemistry of the total amount of the pre-dispersed solvent-free hydroxyl-terminated epoxy resin are uniformly stirred to form color paste, a high-efficiency alloy horizontal sand mill is used, matched superhard ceramic zirconium beads are used as grinding media, the color paste is dispersed until the fineness of the paste is less than 15 mu m, then the rest solvent-free hydroxyl-terminated epoxy resin, 15 parts of attapulgite/polyaniline filler and 0.1 part of dimethyl ethanol ammonia catalyst are put into the color paste, and are fully stirred by a stirrer, filtered and packaged to obtain a component A finished product.
(2) Preparing a component B: the same as in example 1.
(3) Preparing a solvent-free heavy-duty anticorrosive coating: and mixing the component A finished product and the component B finished product according to the mass ratio of 3:1, and uniformly stirring to obtain the solvent-free attapulgite/polyaniline heavy-duty anticorrosive paint.
The construction is carried out by adopting a brush coating method, and the solvent-free attapulgite/polyaniline heavy-duty anticorrosive coating is formed after the coating is naturally dried at normal temperature.
Example 4
(1) Preparing a component A: same as example 2
(2) Preparing a component B: the equivalent ratio of epoxy equivalent to active hydrogen of diethanolamine is as follows: 1: 1, putting the E-20 epoxy resin into a reaction kettle, stirring, and controlling the reaction temperature as follows: dropping diethanolamine into the mixture at 140 ℃, and reacting for 2 hours under heat preservation to obtain the solvent-free hydroxyl-terminated epoxy resin; cooling, and controlling the reaction temperature as follows: at 50 ℃, the equivalent ratio of OH to NCO is: 2: adding aliphatic isocyanate and diethanol amine into the mixture according to the equivalent ratio of 1, adding 0.005 part of benzoyl chloride, and carrying out heat preservation reaction for 3 hours to obtain the modified epoxy resin.
The construction is carried out by adopting a roll coating method, and the solvent-free attapulgite/polyaniline heavy-duty anticorrosive coating is formed after the coating is naturally dried at normal temperature.
Comparative example 1
(1) Preparing a component A:
① Synthesis of solvent-free hydroxyl-terminated epoxy resin:
putting 55 parts of low-molecular-weight liquid epoxy resin, 25 parts of diglycidyl ether and 20 parts of secondary monoamine into a reaction kettle, stirring, heating to 70 ℃, keeping the temperature for reaction for 3 hours, cooling, and discharging to obtain the solvent-free hydroxyl-terminated epoxy resin.
② Pre-dispersion
And (3) adding 1.5 parts of polyacrylic ammonium salt dispersing agent into the solvent-free hydroxyl-terminated epoxy resin prepared in the step ① for pre-dispersion.
③ preparation of finished product of component A:
2/3 parts of aluminum tripolyphosphate with 1250 meshes and 0.2 part of BYK-051 defoaming agent with Pico chemistry of the total amount of the pre-dispersed solvent-free hydroxyl-terminated epoxy resin are uniformly stirred to form color paste, a high-efficiency alloy horizontal sand mill is used, matched superhard ceramic zirconium beads are used as grinding media, the color paste is dispersed until the fineness of the paste is less than 15 mu m, then the residual solvent-free hydroxyl-terminated epoxy resin, 12 parts of attapulgite/polyaniline filler and 0.1 part of dimethyl ethanol ammonia catalyst are put into the color paste, and are fully stirred by a stirrer, filtered and packaged to obtain a component A finished product.
(2) Preparing a component B: subpackaging R-1541 isocyanate modified epoxy resin stock solution of Asahi Asia electronic chemistry (Kunshan) Co., Ltd to obtain the B component finished product.
(3) Preparing a solvent-free heavy-duty anticorrosive coating: and mixing the component A finished product and the component B finished product according to the mass ratio of 3:1, and uniformly stirring to obtain the solvent-free attapulgite/polyaniline heavy-duty anticorrosive paint.
The construction is carried out by adopting a roll coating method, and the solvent-free attapulgite/polyaniline heavy-duty anticorrosive coating is formed after the coating is naturally dried at normal temperature.
Comparative example 2
(1) Preparing a component A:
① Synthesis of solvent-free hydroxyl-terminated epoxy resin:
putting 55 parts of low-molecular-weight liquid epoxy resin, 25 parts of diglycidyl ether and 20 parts of secondary monoamine into a reaction kettle, stirring, heating to 70 ℃, keeping the temperature for reaction for 3 hours, cooling, and discharging to obtain the solvent-free hydroxyl-terminated epoxy resin.
② preparation of finished product of component A:
2/3 parts of aluminum tripolyphosphate with 1250 meshes and 0.2 part of BYK-051 defoaming agent with Pico chemistry, which are based on the total amount of the solvent-free hydroxyl-terminated epoxy resin, are uniformly stirred to form color paste, and a high-efficiency alloy horizontal sand mill is used, matched superhard ceramic zirconium beads are used as grinding media, the color paste is dispersed until the fineness of the color paste is less than 15 mu m, then the rest solvent-free hydroxyl-terminated epoxy resin, 12 parts of attapulgite/polyaniline filler and 0.1 part of dimethyl ethanol ammonia catalyst are put into the color paste, and are fully stirred by a stirrer, filtered and packaged to obtain a component A finished product.
(2) Preparing a component B: the same as in example 1.
(3) Preparing a solvent-free heavy-duty anticorrosive coating: and mixing the component A finished product and the component B finished product according to the mass ratio of 3:1, and uniformly stirring to obtain the solvent-free attapulgite/polyaniline heavy-duty anticorrosive paint.
The construction is carried out by adopting a roll coating method, and the solvent-free attapulgite/polyaniline heavy-duty anticorrosive coating is formed after the coating is naturally dried at normal temperature.
Table 1 results of performance test of each example and comparative example
The solvent-free heavy-duty anticorrosive coating prepared from the modified epoxy resin prepared by the method greatly improves the antirust performance and the adhesive property of the coating, increases the density of the coating and improves the antirust effect of the coating; the invention is suitable for the surface rust prevention protection of bridges, ships, towers, waiting (locomotive) halls, plants, stadiums and the like which are made of steel materials.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (6)
1. A preparation method of solvent-free heavy-duty anticorrosive paint is characterized by comprising the following steps: the preparation method of the solvent-free heavy-duty anticorrosive paint comprises the following steps:
(1) preparing a component A:
① Synthesis of solvent-free hydroxyl-terminated epoxy resin
Putting low-molecular-weight liquid epoxy resin, diglycidyl ether and primary amine into a reaction kettle according to the mass percentage, stirring, heating to 60-80 ℃, carrying out heat preservation reaction for 2-4 h, cooling, and discharging to obtain the solvent-free hydroxyl-terminated epoxy resin;
② Pre-dispersion
Adding a dispersing agent into the solvent-free hydroxyl-terminated epoxy resin prepared in the step ① for pre-dispersion;
③ preparation of component A
Adding 2/3 of the total amount of the solvent-free hydroxyl-terminated epoxy resin pre-dispersed in the step ②, pigment and a defoaming agent into a paint preparation tank, uniformly stirring to form color paste, dispersing by using grinding equipment until the fineness of the paste is less than 15 mu m, then adding the remaining solvent-free hydroxyl-terminated epoxy resin, attapulgite/polyaniline filler and a catalyst into the color paste, fully and uniformly stirring by using a stirrer, filtering and packaging to obtain a component A finished product;
(2) preparing a solvent-free heavy-duty anticorrosive coating: mixing the finished product of the component A and the modified epoxy resin serving as the component B according to the mass ratio of 3:1, and uniformly stirring to prepare the solvent-free heavy-duty anticorrosive paint;
the preparation method of the modified epoxy resin comprises the following steps:
1) according to the equivalent ratio of reactants, E-20 epoxy resin is put into a reaction kettle and stirred, and the reaction temperature is controlled as follows: dropping diethanolamine into the mixture at 130-140 ℃, and reacting for 2-4 h under heat preservation to obtain the solvent-free hydroxyl-terminated epoxy resin;
2) cooling the solvent-free hydroxyl-terminated epoxy resin obtained in the step 1), and controlling the reaction temperature as follows: and adding aliphatic isocyanate, benzoyl chloride and diethanol amine into the mixture at the temperature of 50-70 ℃, and reacting for 2-3 hours under heat preservation to obtain the modified epoxy resin.
2. The method for preparing the solvent-free heavy-duty anticorrosive paint according to claim 1, characterized in that: the equivalent ratio of reactants in the step 1) is as follows: the equivalent ratio of epoxy equivalent to active hydrogen of diethanolamine is: 1: 1.
3. the method for preparing the solvent-free heavy-duty anticorrosive paint according to claim 1, characterized in that: the equivalent ratio of OH to NCO in step 2) is: 1.8-2.0: 1.
4. the method for preparing the solvent-free heavy-duty anticorrosive paint according to claim 1, characterized in that: the solvent-free hydroxyl-terminated epoxy resin comprises the following components in parts by weight: low molecular liquid epoxy resin: 40-60 parts of diglycidyl ether, 15-30 parts of secondary amine and 20-30 parts of secondary monoamine.
5. The method for preparing the solvent-free heavy-duty anticorrosive paint according to claim 1, characterized in that: the dispersant is polyacrylic ammonium salt, and the dosage of the dispersant is 1-3% of the mass of the solvent-free hydroxyl-terminated epoxy resin.
6. The method for preparing the solvent-free heavy-duty anticorrosive paint according to claim 1, characterized in that: the defoaming agent is a defoaming polymer solution without organic silicon, and the dosage of the defoaming agent is 0.2-0.5% of the mass of the solvent-free hydroxyl-terminated epoxy resin; the pigment is one or a mixture of more than two of 800-mesh zinc phosphate, 1250-mesh aluminum tripolyphosphate or 1000-mesh mica iron oxide, and the dosage of the pigment is as follows: 5-10% of the mass of the solvent-free hydroxyl-terminated epoxy resin; the dosage of the attapulgite/polyaniline filler is 10-15% of the mass of the solvent-free hydroxyl-terminated epoxy resin; the catalyst is dimethyl ethanol ammonia or methyl diethanol amine, and the dosage of the catalyst is 0.1-0.3% of the mass of the solvent-free hydroxyl-terminated epoxy resin.
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| CN112480780A (en) * | 2020-11-21 | 2021-03-12 | 杨涛涛 | Anticorrosive paint and preparation method and application thereof |
| CN113637388A (en) * | 2021-08-20 | 2021-11-12 | 国网福建省电力有限公司电力科学研究院 | Isocyanate-based epoxy resin antirust primer |
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