CN112500764A - Solvent-free epoxy zinc-rich anticorrosive paint and preparation method thereof - Google Patents
Solvent-free epoxy zinc-rich anticorrosive paint and preparation method thereof Download PDFInfo
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- 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
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- 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
- C08G59/56—Amines together with other curing agents
- C08G59/60—Amines together with other curing agents with amides
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- 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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention discloses a solvent-free epoxy zinc-rich anticorrosive paint, which is prepared by adding a large amount of zinc powder and a small amount of glass flakes into high-solid-content epoxy resin, an epoxy active diluent, a plasticizer, a coupling agent, a polyamine curing agent and an accelerator as anticorrosive fillers. The product can form a film at low temperature, and has the advantages of good stability, low viscosity, no need of heating, good mechanical property and good adhesive force. No solvent is volatilized during curing, so that pinholes in the coating can be eliminated, the compactness and the isolation shielding performance of the coating are improved, the excellent anti-corrosion performance is provided, no harmful VOC is generated during production and construction, the environment is protected, and resources are saved; and the construction cost can be obviously reduced.
Description
Technical Field
The invention relates to the technical field of chemical coatings, in particular to a solvent-free epoxy zinc-rich anticorrosive coating and a preparation method thereof.
Background
Metal materials play a very important role in economic life; the phenomenon that a metal material undergoes physical, chemical and electrochemical changes in a corrosive environment so that the properties change until the metal material is finally completely damaged is called metal material corrosion. However, corrosion of metal materials is a serious problem facing the world, corrosion not only consumes valuable resources but also destroys normal living and production order, corrosion and environmental pollution are attracting more and more attention, and the protection of metals by anticorrosive coatings is the most effective and economical method, among which the anticorrosive coatings for metal structural equipment are the most rapid and effective methods at present. The coating is mainly used for protecting steel materials through a chemical mechanism and a barrier effect.
The epoxy zinc-rich paint is a heavy-duty anticorrosive paint with excellent corrosion resistance, and is widely applied to various industrial anticorrosion fields. The corrosion prevention mechanism of the zinc-rich coating is mainly that zinc plays a role in cathodic protection, namely zinc powder (anode) is sacrificed in a corrosive environment to protect steel (cathode). In order to make the zinc-rich coating fully and effectively play a role in cathodic protection, a large amount of zinc powder is added into the coating. The larger the sheet diameter of the zinc powder is, the stronger the resistance to the penetration of water vapor and corrosive media is, and the corrosion resistance of the coating by the media can be retarded.
Along with the enhancement of people's consciousness on environmental protection and the development of maintenance-free coating systems, long-acting, environment-friendly and energy-saving solvent-free anticorrosive coatings are increasingly adopted by engineering construction, and the solvent-based epoxy zinc-rich coatings have the following defects: the operability of construction and the storage stability of the coating are poor, a paint film is easy to foam, and more importantly, the VOC content is high, and the solvent-based coating is not environment-friendly generally. The traditional epoxy zinc-rich anticorrosive paint generally contains a large amount of organic solvents, the compactness of the coating is damaged by volatilization of the solvents, and meanwhile, needle holes and shrinkage cavities are easily formed, so that water and medium ions can easily reach the surface of a substrate through diffusion and transmission, and the coating is cracked after the generated corrosive substances expand, and finally the coating falls off, thereby losing the protection effect. In addition, the high-content zinc powder precipitate is easy to block the gun in the construction process, so that the coating quality and the construction efficiency are influenced. The solvent in the paint not only causes waste, but also causes harm to the environment, so the development of the solvent-free zinc-rich anticorrosive paint is a key development direction of the paint industry. With the limitation of organic volatile compounds in large pipe coatings used in these fields, solvent-based coatings will be gradually replaced by eco-friendly coatings, and solventless coatings will be one of the main types of eco-friendly coatings. The solvent-free epoxy zinc-rich anticorrosive paint has the advantages that: because no solvent is volatilized in the paint film, pinholes in the coating can be eliminated, and the anti-penetration and corrosion-resistant performances of the paint film are improved; can eliminate the danger of poisoning of operators and fire hazard on construction sites, can reduce the use of ventilation equipment, can avoid the resource waste caused by solvent volatilization and reduce the influence on the environment. However, the solvent-free paint has the defects that the paint has high viscosity, the construction is not convenient, and the paint needs to be heated when being sprayed; due to the high viscosity, it is difficult to obtain thinner coatings, which are often suitable for thick coatings. When the thickness of the coating film is less than 100 mu m, the defects of pits, pinholes, orange peel and the like are easy to appear on the appearance of the coating.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects in the application of the zinc-rich coating and the solvent-free epoxy in the prior art, the invention mainly aims to provide the solvent-free epoxy zinc-rich anticorrosive coating and the preparation method thereof, the obtained product has excellent anticorrosive performance, small viscosity, no need of heating, no solvent volatilization during curing, no pore-free coating formed, the compactness and the isolation shielding performance of the coating are improved, the mechanical property is good, the adhesive force is strong, the conductivity and the thin coating performance are realized, and the thickness of one-time film forming can be less than or equal to 75 micrometers; no harmful VOC is produced and constructed.
In order to achieve the purpose, the invention provides a solvent-free epoxy zinc-rich anticorrosive paint which consists of two components A and B, wherein the component A comprises the following components in parts by weight:
b comprises the following components in parts by weight:
1-4 parts of a modified phenolic aldehyde amine curing agent;
1-4 parts of a polyamide curing agent;
0.25-0.4 part of curing accelerator;
wherein the weight ratio of A to B is (0.8-1.2): 1.
Specifically, the epoxy resin is a mixture of south Asia 128 epoxy resin and NPEF-170 epoxy resin. Wherein the epoxy resin is south Asia 128 epoxy resin, the solid content is 100 percent, and the epoxy resin belongs to high-performance basic epoxy resin and has the characteristics of low toxicity, no color, low viscosity, high purity, no impurities and the like; the NPEF-170 epoxy resin has the solid content of 100 percent, is low-viscosity resin, and has chemical resistance, heat resistance and the like; preferably, the two resins are mixed according to the solid content of 2:1, and the mechanical property and the corrosion resistance are excellent. The single epoxy resin is used, the viscosity is high, the effect is poor, the construction is not convenient, the double-pump spraying is required to be heated, the viscosity can be effectively reduced by using the mixture of the two epoxy resins, and the construction is convenient.
Preferably, the reactive diluent is a mixture of an air chemical engineering epoxy diluent 748 and UltraLITE513, wherein the solid content of the air chemical engineering epoxy 748 is 100% colorless transparent liquid, and the air chemical engineering epoxy 748 is a commonly used low-viscosity, colorless and tasteless monofunctional diluent, and has good flexibility and low volatility; cadrilulite 513 is a low viscosity, monofunctional epoxy reactive diluent with 100% solids content, no irritating odor, good water resistance, toughness and thermal shock resistance. Preferably, the two active diluents are mixed according to the solid content of 1:1, so that the viscosity reducing agent has good viscosity reducing capability on general epoxy resin, has wettability on a non-polar surface, has excellent pigment and filler wetting capability, and can increase the corrosion resistance.
Preferably, the plasticizer is benzyl alcohol, and the main advantages of the benzyl alcohol used as the plasticizer for the epoxy resin are that: the material is non-toxic, high in boiling point and not easy to volatilize, and after being cured, the benzyl alcohol has strong polarity, so that the benzyl alcohol can be well compatible with the epoxy resin, and the migration phenomenon cannot occur; the reaction of the epoxy resin and the amine can be promoted, and the reaction speed is accelerated; the hydrophobic coating has good hydrophobic property, can obviously improve the luster of the coating and reduce the occurrence of the phenomenon of white birch; the toughness of the cured product can be improved.
The coupling agent is a silane coupling agent of Michelia A-187, which can effectively improve the adhesive force and the adhesive force of resin and base materials.
Preferably, the dispersant is a BYK-203 dispersant or a BYK-163 dispersant. The dispersing agent can effectively disperse the pigment and the filler in the formula, improve the wettability of the pigment and enhance the stability of a system.
Preferably, the thixotropic agent is Haimanshixatrol ST which has the function of an organic rheological additive and is a castor oil modified derivative, so that the thickening effect is obvious, sagging is controlled, leveling and fluidity are not reduced, the viscosity of the coating is effectively improved, and the storage stability is enhanced.
Preferably, the zinc powder is 325-mesh zinc powder or 500-mesh zinc powder. Preferably, zinc powder with the grain diameter of 325 meshes or zinc powder with the grain diameter of 500 meshes in the American rich rainbow zinc powder can be selected as the anti-rust pigment to play the roles of corrosion resistance and cathodic protection.
Specifically, the glass flakes are RCF-015 or RCF-016 glass flakes from Nippon trigger. The addition of the glass flakes can prolong the service life of the coating, can also greatly reduce the content of bubbles in the final coating, and the glass flakes are parallel to the substrate in the finally formed paint film, so that the diffusion path of a permeable medium can be effectively prolonged, and the shielding performance of the paint film is greatly improved.
Preferably, the curing agent is a mixture of Shanghai Tian JT-6180 modified phenolic aldehyde amine curing agent and American air chemical industry polyamide adduct curing agent; wherein, the solid content of the Shanghai modified phenolic aldehyde amine curing agent is 100 percent through natural JT-6180; the American air chemical industry polyamide addition compound curing agent has the solid content of 100 percent, and in a preferred embodiment, the two products are mixed according to the solid content of (1-4): 1, so that the American air chemical industry polyamide addition compound curing agent has good low-temperature curing performance, low viscosity, good water resistance, salt mist resistance and chemical corrosion resistance, excellent mechanical property of a cured paint film, and good oil surface resistance and permeability resistance.
The air chemical K-54 or Sanmu DMP-30 epoxy curing accelerator is a multifunctional accelerator, is suitable for accelerating the curing time of epoxy resin, and has good compatibility with polyamine curing agents.
The invention further provides a preparation method of the solvent-free epoxy zinc-rich anticorrosive paint, which is characterized by comprising the following steps:
(1) weighing the raw materials according to the formula amount, and putting the epoxy resin of the formula amount into a stirrer; then adding the reactive diluent according to the formula amount, stirring at the speed of 500-800 r/min for 10-15 minutes;
(2) adjusting the stirring speed to 800-1000 r/min, adding a thixotropic agent and a coupling agent in the stirring process, then keeping stirring at the rotating speed of 1000-2500 r/min, continuously stirring at high speed for 25-30 minutes, and keeping the temperature at 46-52 ℃ until the fineness is less than or equal to 60 mu m;
(3) adjusting the stirring speed to 800-1000 r/min, sequentially adding a dispersing agent and antirust filler zinc powder, and washing the zinc powder and the wall of a cleaning cylinder by using part of plasticizer; then continuously stirring at 1000-2000 r/min for 30-40 min at a high speed, wherein the temperature is not more than 50 ℃; after the stirring is finished, slowly stirring and cooling to 35-40 ℃;
(4) adding the glass flakes during stirring, then keeping the rotating speed of 700-1200 r/min, continuing stirring for 10-20 min, and adjusting the stirring head up and down until the glass flakes are uniformly dispersed; then adding a part of plasticizer according to the viscosity for cleaning, and uniformly stirring to obtain a component A;
(5) putting the modified phenolic aldehyde amine curing agent and the polyamide curing agent into another stirrer, and stirring for 10-15 minutes at a stirring speed of 500-1000 r/min; then adding a curing accelerator, stirring at the speed of 500-1000 r/min for 10-15 minutes, and uniformly dispersing to obtain a component B;
(6) mixing the component A and the component B according to the weight ratio, stirring uniformly, curing for 7-15 min, and coating.
Preferably, the epoxy resin is a mixture of south Asia 128 epoxy resin and NPEF-170 epoxy resin.
The active diluent is a mixture of an air chemical epoxy diluent 748 and an UltraLITE 513.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) because high-content zinc powder (more than 88%) in the coating can be in close contact with the surface of a coated metal material, the electrochemical cathode protection effect is achieved, the cathode protection effect is fully and effectively exerted, the capability of resisting the penetration of water vapor and corrosive media is realized, the etching speed of the media to the coating is delayed, and the corrosion resistance is enhanced;
(2) the glass flakes have a fish scale effect, thousands of flakes are staggered to form a complex and zigzag permeation and diffusion path in the coating, so that the diffusion path of a corrosive medium becomes quite tortuous and is difficult to reach a base material, the diffusion path of the corrosive medium in a coating film is greatly prolonged, the corrosion of the corrosive medium to a base material is effectively delayed, a large amount of zinc powder and a small amount of glass flakes are used as anticorrosive fillers, and high-efficiency high-volume solid content solvent-free epoxy zinc-rich anticorrosive coating is prepared by combining high solid content epoxy resin, an epoxy active diluent, a plasticizer, a coupling agent and a polyamine curing agent;
(3) the product obtained by the invention has excellent anti-corrosion performance, small viscosity, no need of heating, no solvent volatilization during curing, no-pore coating formed, improved compactness and isolation shielding performance of the coating, good mechanical performance, strong adhesive force, conductivity and thin coating, and one-time film forming thickness of less than or equal to 75 mu m; no harmful VOC is generated during production and construction, the environment is protected, and resources are saved; the coating components are all converted into a film, and in addition, the raw material cost per unit thickness is very low; the construction cost can be obviously reduced; therefore, the research of the solvent-free epoxy zinc-rich anticorrosive paint can effectively improve the utilization efficiency of resources, reduce the resource waste and improve the economic benefit, thereby promoting the sustainable development of society, and having important significance for life and national economy;
(4) the product of the invention has wide industrial corrosion resistance, strong adhesive force, quick drying at normal temperature, higher zinc powder content in a paint film and cathodic protection effect, and is mainly suitable for steel and iron members such as bridges, containers, steel pipes, storage tanks and the like, and primer coatings of ships, offshore oil drilling platforms, harbor facilities, chemical equipment, severe corrosive environments and the like.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the scope of the present invention is not limited to the examples described below.
Wherein, in the following examples, the glass flakes are RCF-015 or RCF-016 glass flakes from Nippon Kawatsu corporation; the thixotropic agent is THIXATROL ST; the active diluent is a mixture of air chemical epoxy diluent 748 and UltraLITE513 which are mixed according to the ratio of 1: 1; the plasticizer is benzyl alcohol, the coupling agent is a silane coupling agent of a Meiji chart A-187, the dispersing agent is a BYK-203 dispersing agent or a BYK-163 dispersing agent, and the epoxy resin is a mixture of south Asia 128 epoxy resin and NPEF-170 epoxy resin according to the solid content of 2: 1; the modified phenolic aldehyde amine curing agent is a Shanghai modified phenolic aldehyde amine curing agent subjected to Tian JT-6180, and the polyamide curing agent is a national air chemical industry polyamide addition compound curing agent; the curing accelerator is an air chemical K-54 or Sanmu DMP-30 epoxy curing accelerator.
Example 1
A solvent-free epoxy zinc-rich anticorrosive paint comprises a component A and a component B, wherein the component A comprises the following components in parts by weight:
the component B comprises the following components in parts by weight:
4 parts of modified phenolic aldehyde amine curing agent;
1 part of polyamide curing agent;
0.25 part of curing accelerator;
the weight ratio of the component A to the component B is 0.8: 1; and mixing the component A and the component B according to the weight ratio, uniformly stirring, curing for 7-15 min, and coating.
The preparation method comprises the following steps:
firstly, weighing raw materials according to the proportion, and preparing epoxy resin; then slowly adding the active diluent, stirring at the speed of 500-800 r/min for 10-15 minutes;
secondly, adjusting the stirring speed to 800-1000 r/min, adding a thixotropic agent and a coupling agent in the stirring process, then keeping the stirring at the rotating speed of 1000-2500 r/min, and continuously stirring at a high speed for 25-30 minutes at the temperature of 46-52 ℃ until the fineness is less than or equal to 60 mu m;
thirdly, adjusting the stirring speed to 800-1000 r/min, sequentially adding a dispersing agent and antirust filler zinc powder, washing the zinc powder with a plasticizer and cleaning the wall of the cylinder; then continuously stirring at 1000-2000 r/min for 30-40 min at the temperature not exceeding 50 ℃; and after the stirring is finished, slowly stirring and cooling to 35-40 ℃.
Adding the glass flakes into the mixture during stirring, keeping the stirring speed of 700-1200 r/min, continuing stirring for 10-20 min, and adjusting the stirring head up and down until the glass flakes are uniformly dispersed; then adding a small amount of plasticizer according to the viscosity, and uniformly stirring to obtain a component A;
fifthly, putting the modified phenolic aldehyde amine curing agent and the polyamide curing agent into a new stirrer, wherein the stirring speed is 500-1000 r/min, and stirring for 10-15 minutes; then adding a curing accelerator, stirring at the speed of 500-1000 r/min for 10-15 minutes, and uniformly dispersing to obtain a component B;
the weight ratio of the component A to the component B is 0.8: 1; and mixing the component A and the component B according to the weight ratio, uniformly stirring, curing for 7-15 min, and coating.
Example 2
A solvent-free epoxy zinc-rich anticorrosive paint comprises a component A and a component B, wherein the component A comprises the following components in parts by weight:
comprises the following components B in parts by weight:
2.5 parts of modified phenolic aldehyde amine curing agent;
2.5 parts of polyamide curing agent;
0.4 part of curing accelerator;
the preparation method comprises the following steps: the same as in example 1.
The weight ratio of the component A to the component B is 1.2: 1; and mixing the component A and the component B according to the weight ratio, uniformly stirring, curing for 7-15 min, and coating.
Example 3
A solvent-free epoxy zinc-rich anticorrosive paint comprises a component A and a component B, wherein the component A comprises the following components in parts by weight:
comprises the following components B in parts by weight:
2.5 parts of modified phenolic aldehyde amine curing agent;
2.5 parts of polyamide curing agent;
0.3 part of curing accelerator;
the preparation method comprises the following steps: the same as in example 1.
The weight ratio of the component A to the component B is 0.95: 1; and mixing the component A and the component B according to the weight ratio, uniformly stirring, curing for 7-15 min, and coating.
Example 4
A solvent-free epoxy zinc-rich anticorrosive paint comprises a component A and a component B, wherein the component A comprises the following components in parts by weight:
comprises the following components B in parts by weight:
3 parts of modified phenolic aldehyde amine curing agent;
2 parts of polyamide curing agent;
0.3 part of curing accelerator.
The preparation method comprises the following steps: the same as in example 1.
The weight ratio of the component A to the component B is 1: 1; and mixing the component A and the component B according to the weight ratio, uniformly stirring, curing for 7-15 min, and coating.
The result of the detection
The solvent-free epoxy zinc-rich coatings of examples 1-4 were tested according to the test criteria, and the results are shown in table 1:
TABLE 1
As can be seen from Table 1, the coating obtained by optimally matching the use amounts of the components in example 4 has excellent anticorrosive performance and mechanical performance; in the embodiment 1, the epoxy resin is reduced, the ratio of the modified phenolic aldehyde amine curing agent to the polyamide curing agent is adjusted, and the antirust filler is added, so that the obtained coating has the advantages of substandard salt spray resistance, poor adhesive force, impact resistance and poor flexibility; in the embodiment 2, the resin dosage and the plasticizer dosage are increased, the active diluent dosage is reduced, the proportion of the curing agent is reasonably adjusted, and the salt spray resistance and the adhesive force of the obtained coating do not reach the standard; in the embodiment 3, the dosage of the resin and the curing agent is reasonably matched, the antirust filler and the glass flakes are added, and the condensation resistance does not reach the standard.
Compared with solvent type epoxy zinc-rich paint, the technology introduces the combination of high solid content epoxy resin, epoxy active diluent, plasticizer, coupling agent, polyamine curing agent and accelerator, and adds a large amount of zinc powder and a small amount of glass flakes as anticorrosive fillers to prepare the high-efficiency high-volume solid content solvent-free epoxy zinc-rich anticorrosive paint. The product can form a film at low temperature, and has the advantages of good stability, low viscosity, no need of heating, good mechanical property and good adhesive force. No solvent is volatilized during curing, so that pinholes in the coating can be eliminated, the compactness and the isolation shielding performance of the coating are improved, the excellent anti-corrosion performance is provided, no harmful VOC is generated during production and construction, the environment is protected, and resources are saved; the construction cost can be obviously reduced; the product belongs to an environment-friendly product with sustainable development, and the stable performance of the product is ensured; the method also improves the utilization efficiency of resources, reduces the waste of resources and improves the economic benefit, so the method has important significance for the research of the solvent-free zinc-rich anticorrosive paint in both life and national economy and can completely replace solvent-based zinc-rich paint.
The invention provides a preparation idea and a method of a solvent-free epoxy zinc-rich anticorrosive paint, and a method and a way for realizing the technical scheme are many, the above description is only a preferred embodiment of the invention, and it should be noted that, for a person skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the invention, and the improvements and decorations should also be regarded as the protection scope of the invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. The solvent-free epoxy zinc-rich anticorrosive paint is characterized by consisting of two components A and B, wherein the component A comprises the following components in parts by weight:
b comprises the following components in parts by weight:
1-4 parts of a modified phenolic aldehyde amine curing agent;
1-4 parts of a polyamide curing agent;
0.25-0.4 part of curing accelerator;
wherein the weight ratio of A to B is (0.8-1.2): 1.
2. The solventless epoxy zinc-rich anticorrosive coating of claim 1, wherein the epoxy resin is a mixture of south Asia 128 epoxy resin and NPEF-170 epoxy resin.
3. The solvent-free epoxy zinc-rich anticorrosive paint according to claim 1, wherein the reactive diluent is a mixture of an air chemical epoxy diluent 748 and an UltraLITE513, or any one or a combination of the two; the plasticizer is benzyl alcohol; the coupling agent is a silane coupling agent of a Michael diagram A-187; the dispersant is BYK-203 or BYK-163 dispersant.
4. The solventless epoxy zinc rich anticorrosive coating of claim 1, wherein the thixotropic agent is Haimax THIXATROL ST.
5. The solvent-free epoxy zinc-rich anticorrosive paint of claim 1, wherein the zinc powder is 325 mesh zinc powder or 500 mesh zinc powder.
6. The solvent-free epoxy zinc-rich anticorrosive paint according to claim 1, wherein the glass flakes are RCF-015 or RCF-016 glass flakes from japan panel niter corporation.
7. The solvent-free epoxy zinc-rich anticorrosive paint according to claim 1, wherein the curing agent is a mixture of Shanghai Tian JT-6180 modified phenolic aldehyde amine curing agent and air chemical polyamide adduct curing agent; the curing accelerator is an air chemical K-54 or Sanmu DMP-30 epoxy curing accelerator.
8. The method for preparing the solvent-free epoxy zinc-rich anticorrosive paint according to any one of claims 1 to 7, characterized by comprising the following steps:
(1) weighing the raw materials according to the formula amount, and putting the epoxy resin of the formula amount into a stirrer; then adding the reactive diluent according to the formula amount, stirring at the speed of 500-800 r/min for 10-15 minutes;
(2) adjusting the stirring speed to 800-1000 r/min, adding a thixotropic agent and a coupling agent in the stirring process, then keeping stirring at the rotating speed of 1000-2500 r/min, continuously stirring at high speed for 25-30 minutes, and keeping the temperature at 46-52 ℃ until the fineness is less than or equal to 60 mu m;
(3) adjusting the stirring speed to 800-1000 r/min, sequentially adding a dispersing agent and antirust filler zinc powder, and washing the zinc powder and the wall of a cleaning cylinder by using part of plasticizer; then continuously stirring at 1000-2000 r/min for 30-40 min at a high speed, wherein the temperature is not more than 50 ℃; after the stirring is finished, slowly stirring and cooling to 35-40 ℃;
(4) adding the glass flakes during stirring, then keeping the rotating speed of 700-1200 r/min, continuing stirring for 10-20 min, and adjusting the stirring head up and down until the glass flakes are uniformly dispersed; then adding a part of plasticizer according to the viscosity for cleaning, and uniformly stirring to obtain a component A;
(5) putting the modified phenolic aldehyde amine curing agent and the polyamide curing agent into another stirrer, and stirring for 10-15 minutes at a stirring speed of 500-1000 r/min; then adding a curing accelerator, stirring at the speed of 500-1000 r/min for 10-15 minutes, and uniformly dispersing to obtain a component B;
(6) mixing the component A and the component B according to the weight ratio, stirring uniformly, curing for 7-15 min, and coating.
9. The method of claim 8, wherein the epoxy resin is a mixture of south asian 128 epoxy resin and NPEF-170 epoxy resin.
10. The method of claim 8, wherein the reactive diluent is a mixture of an aerochemical epoxy diluent 748 and UltraLITE 513.
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| CN114479607A (en) * | 2021-12-28 | 2022-05-13 | 锌盾化工无锡有限公司 | High-performance epoxy modified thick paste anticorrosive paint and preparation method thereof |
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