CN115286970B - Solvent-free wet-on-wet construction epoxy anti-corrosion primer and preparation method thereof - Google Patents
Solvent-free wet-on-wet construction epoxy anti-corrosion primer and preparation method thereof Download PDFInfo
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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
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- 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
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- 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
- C08G59/5006—Amines aliphatic
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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
- C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
- C09D5/084—Inorganic compounds
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- 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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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
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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
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- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K2003/2241—Titanium dioxide
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- C08K2003/327—Aluminium phosphate
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Abstract
The invention discloses a solvent-free wet-on-wet construction epoxy anti-corrosion primer and a preparation method thereof, belonging to the field of anti-corrosion paint. The anticorrosive paint consists of a component A and a component B, wherein the component A consists of the following components: composite epoxy resin, an inactive diluent, a dispersing agent, a pigment, an antirust pigment, a filler and a rheological additive; the component B consists of the following components: amine curing agent and reaction accelerator. Through the interaction among the components, the coating has the characteristics of no solvent, excellent chemical corrosion resistance and capability of being constructed with polyurethane finish paint in a wet-on-wet manner, can be coated on places such as steel structures, pipelines, bridges, mechanical equipment, building structures and the like, has good corrosion resistance to chemicals such as water, brine, acid, alkali and the like, shortens construction interval time, improves construction efficiency and saves construction cost.
Description
Technical Field
The invention relates to the field of anti-corrosion paint, in particular to solvent-free epoxy anti-corrosion primer capable of being used for wet-on-wet construction and a preparation method thereof, which can be used for anti-corrosion coating of places such as steel structures, pipelines, engineering machinery, buildings and the like and can be used for wet-on-wet construction with polyurethane finish paint.
Background
Along with the increasingly strict national control on the VOC emission of the paint, the new generation of paint is developed towards the direction of low VOC, in a few paths of paint low VOC, the water-based paint is greatly influenced by construction environment, the powder paint and the UV paint all need special curing equipment, and the solvent-free paint has better development advantages in the field of anticorrosive paint due to the characteristics of no volatile organic solvent, good corrosion resistance and easy construction. In the field of medium anti-corrosion paint, an anti-corrosion scheme of matching epoxy anti-corrosion primer with acrylic polyurethane finish paint is often adopted for corrosion protection of steel structures, pipelines, engineering machinery and the like, but because an amine curing agent adopted for curing the epoxy paint and an isocyanate curing agent adopted for polyurethane paint can react chemically, the construction interval between the epoxy primer and the polyurethane finish paint needs to be controlled in construction, and the construction is carried out after the epoxy primer is fully cured. However, in actual operation, a construction method adopting wet-on-wet construction technology, namely, the construction of polyurethane finish paint is carried out before the epoxy primer is fully cured, is adopted for the construction method to save construction period or construction cost, and the problems of reduced adhesive force, brittle paint film and easy falling off in collision are found in the later detection. The reason is that the reaction of the epoxy curing agent and the polyurethane curing agent in the wet-on-wet process leads to insufficient crosslinking degree of the primer and the finish paint, thereby reducing the adhesive force and the mechanical property. When the solvent-free epoxy primer is adopted as the primer because of the requirement of environmental protection, the solvent-free epoxy primer has slower curing speed than the common low-solid-content primer, the paint film is also more brittle, and the paint film has poorer adhesive force and is easier to fall off after being coated by adopting a wet-on-wet process, so that the construction interval is strictly controlled in the current construction of the solvent-free epoxy primer, the sufficient curing of the primer is ensured, the construction efficiency of the solvent-free primer is also limited, and the popularization is difficult in some industries pursuing the coating efficiency. The invention discloses a solvent-free epoxy anti-corrosion primer which can be coated with polyurethane finish paint by adopting a wet-on-wet process and has good adhesive force and anti-corrosion performance.
Disclosure of Invention
The invention aims to solve the problems and provides a solvent-free epoxy anti-corrosion primer capable of being used in wet-on-wet construction and a preparation method thereof.
The aim of the invention can be achieved by the following technical scheme:
the solvent-free wet-on-wet construction epoxy anticorrosive primer consists of a component A and a component B, wherein the component A and the component B comprise the following components:
and (3) a component A:
10-50 parts of composite epoxy resin, 1-30 parts of an inactive diluent, 1-30 parts of pigment, 1-20 parts of antirust pigment, 10-50 parts of filler, 1-10 parts of rheological additive and 1-5 parts of dispersing agent;
and the component B comprises the following components:
90-100 parts of composite amine curing agent and 5-15 parts of reaction accelerator;
when the component A and the component B are compounded, the mass ratio of the component A to the component B is 5-30:1.
in the technical scheme of the invention, the formula comprises the following components:
and (3) a component A:
20-40 parts of composite epoxy resin, 4-8 parts of an inactive diluent, 15-25 parts of pigment, 5-15 parts of antirust pigment, 25-35 parts of filler, 1-5 parts of rheological additive and 1-5 parts of dispersing agent;
and the component B comprises the following components:
90-100 parts of composite amine curing agent and 5-15 parts of reaction accelerator.
The technical scheme of the invention is as follows: the composite epoxy resin comprises the following components in percentage by mass of 10-20:10-15 and a high-reactivity epoxy resin, wherein the E-44 epoxy resin is selected from three-wood 6101 epoxy resin, and the high-reactivity epoxy resin is preferably selected from Dow DER 3414 or EPALLOY 7200.
The technical scheme of the invention is as follows: the non-reactive diluent is selected from Cardolite LITE 2020 or Cardolite NX-2022.
The technical scheme of the invention is as follows: the rust-proof pigment consists of modified orthophosphate and an organic corrosion inhibitor according to the mass ratio of 5-15:1-5, preferably from HEUCOPHOS ZMP, and preferably from heucopin RZ; further preferred is: the rust-proof pigment consists of modified orthophosphate and an organic corrosion inhibitor according to the mass ratio of 6-8: 1-3.
The technical scheme of the invention is as follows: the rheological additive comprises the following components in percentage by mass of 1-5:0.1-3 of Disparlon 3500 and Pick chemical BYK-410; the dispersing agent is BYK-2014, the pigment is at least one of titanium white powder and carbon black powder, the filler is feldspar powder, and the mesh number is more than or equal to 1500 meshes.
Preferably: the rheological additive comprises the following components in percentage by mass of 1-2:0.1-0.5 of Disparlon 3500 and Pick chemical BYK-410.
The technical scheme of the invention is as follows: the mass ratio of the composite amine curing agent is 50-70:20-40 and a fast-curing fatty amine, wherein the modified phenolic amine is selected from Cardolite NC-540, and the fast-curing fatty amine is selected from Ancamine 1608 or Ancamine 2636 of aerochemistry.
The technical scheme of the invention is as follows: : the reaction promoter is selected from Lv Tege Novares LS 500.
The preparation method of the solvent-free wet-on-wet construction epoxy anti-corrosion primer comprises the following steps:
the preparation method of the component A comprises the following steps:
firstly, uniformly stirring and dispersing the compound epoxy resin, the inactive diluent and the dispersing agent in the formula amount at a high speed to obtain a mixture; secondly, adding pigment and antirust pigment into the mixture, stirring and dispersing at a high speed, and then putting into a sand mill for grinding until the fineness is less than or equal to 40 mu m; adding filler into the ground slurry, and stirring and dispersing at high speed until the fineness is less than or equal to 40 mu m; and finally, slowly and continuously adding the rheological additive under the condition that the rotating speed is controlled to be not lower than 1000r/min, and continuously stirring for 20min after the rheological additive is added to obtain the component A.
The preparation method of the component B comprises the following steps:
adding the compound amine curing agent and the reaction accelerator in the formula amount into a stirring kettle, and dispersing uniformly at a high speed.
The preparation method comprises the following steps: when the component A and the component B are compounded, the mass ratio of the component A to the component B is 10-20:1.
the invention has the beneficial effects that:
the invention makes the paint have the characteristics of no solvent, excellent chemical corrosion resistance and wet-on-wet construction through the interaction among the composite epoxy resin, the non-reactive diluent, the pigment, the rust-proof pigment, the filler, the rheological additive, the composite amine curing agent and the accelerator, can be coated on places such as steel structures, pipelines, bridges, mechanical equipment, building structures and the like, has good corrosion resistance to chemicals such as water, brine, acid, alkali and the like, shortens construction interval time, improves construction efficiency and saves construction cost. The acid resistance and the alkali solution concentration are 5% in the test, and the sagging resistance is higher than 500 micrometers.
Detailed Description
The invention is further illustrated below with reference to examples, but the scope of the invention is not limited thereto:
the epoxy resin and the amine curing agent are all commercial products.
TABLE 1 ingredients and amounts of the respective components of examples 1 to 3
TABLE 2 ingredients and amounts of the respective components of comparative examples 1 to 5
The preparation methods of examples 1 to 3 and comparative examples 1 to 6:
the preparation method of the component A comprises the following steps:
firstly, uniformly stirring and dispersing the compound epoxy resin, the inactive diluent and the dispersing agent in the formula amount at a high speed to obtain a mixture; secondly, adding pigment and antirust pigment into the mixture, stirring and dispersing at a high speed, and then putting into a sand mill for grinding until the fineness is less than or equal to 40 mu m; adding filler into the ground slurry, and stirring and dispersing at high speed until the fineness is less than or equal to 40 mu m; and finally, slowly and continuously adding the rheological additive under the condition that the rotating speed is controlled to be not lower than 1000r/min, and continuously stirring for 20min after the rheological additive is added to obtain the component A.
The preparation method of the component B comprises the following steps:
adding the compound amine curing agent and the reaction accelerator in the formula amount into a stirring kettle, and dispersing uniformly at a high speed.
The samples obtained in examples 1 to 3 and comparative examples 1 to 6 were subjected to performance tests such as surface drying, solid drying, adhesive force, acid and alkali resistance, salt water resistance, salt spray resistance, sagging property, wet-on-wet compatibility with polyurethane finish paint, and the test results are shown in Table 3:
TABLE 3 Table 3
Note that: wet-on-wet compatibility test with polyurethane topcoat: the epoxy primer was applied at about 100 microns, a Tu Bingxi acid polyurethane topcoat was applied at 30min intervals at room temperature for about 60 microns, and cured for 48 hours before testing for cross-hatch adhesion.
The detection result shows that:
1. example 1 and comparative example 1: the resin of comparative example 1 is mainly E-44 resin, and high-reactivity epoxy resin is not added according to the optimal proportion, so that the reaction rate is reduced, the dryness in the test result is obviously slowed down, the operable period is prolonged, and the adhesive force is reduced after the polyurethane finish paint is wet-on-wet.
2. Example 2 and comparative example 2: the epoxy resin in the comparative example 2 is all high-reactivity resin EPALLOY 7200, the reaction speed is high, the surface drying time and the real drying time in the test result are shorter than those in the example 2, the adhesive force with polyurethane finish paint wet-on-wet is good, but the operable period is obviously shortened, the construction is difficult, and meanwhile, the E-44 resin with larger molecular weight and better toughness is not added, so that the bending resistance and the impact resistance of the comparative example 2 are not qualified;
3. example 3 and comparative example 3: in comparative example 3, no fast curing type fatty amine curing agent with higher reactivity and better strength and adhesion is used, the surface drying and the real drying time of comparative example 3 are obviously prolonged in the test result, the adhesion of a single primer is reduced, and the adhesion of the single primer and a polyurethane finish paint after wet-on-wet construction is poor. However, the acid resistance and the salt spray resistance of comparative example 3 were both improved as a result of using all of the modified phenolic amine of comparative example 3 having better corrosion resistance.
4. Example 3 and comparative example 4: no inactive diluent was added in comparative example 4. The non-reactive diluent does not participate in the curing reaction, is not volatilized, and can not reduce the resin curing rate due to the reaction like the reactive diluent, meanwhile, the non-reactive diluent migrates to the surface layer of the primer after being constructed, the surface drying speed of the primer can be improved, after the finishing paint is applied, the non-reactive diluent layer plays a role in blocking the primer and the finishing paint, the contact between the amine curing agent and the polyurethane curing agent is reduced, the adhesive force of a paint film after wet-on-wet application is favorably established, the non-reactive diluent has good flexibility due to the chain structure of the non-reactive diluent, the paint film is toughened, the surface drying time of the comparative example 4 is prolonged, the matching property with the finishing paint is reduced, and the toughness is reduced in the test result.
5. Example 3 and comparative example 5: in comparative example 5, no reaction accelerator is added, the reaction accelerator has the function of catalyzing the reaction of epoxy groups and amine groups, accelerating the curing rate, and improving the curing degree of the primer as much as possible before finishing paint construction, and Lv Tege Novares LS 500 is an environment-friendly nonylphenol substitute, and has good catalytic efficiency, safety and environment friendliness. In the test results, the surface drying and the drying time of the comparative example 5 are prolonged, the adhesive force after wet-on-wet construction is reduced, and other mechanical properties and corrosion resistance are not affected.
6. Example 2 and comparative example 6: in comparative example 6, the a component and the B component are mixed according to the ratio of 8:1, in example 2, the a component and the B component are mixed according to the ratio of 11:1, and test results show that the matching adhesion force of comparative example 6 which is not mixed according to the optimal ratio is reduced when wet-on-wet construction is performed, meanwhile, the acid resistance and the salt spray resistance of comparative example 6 are also reduced slightly, the analysis is that the addition amount of the B component in comparative example 6 is more than that in example 2, the active H of the amine curing agent connected to N in actual curing is reacted first, the formed tertiary amine H still continues to react, a small amount of amine remains in curing when more amine is added, the excessive amine can react with isocyanate groups in the top coat more easily, the matching property of wet-on-wet construction is affected, the amine shows alkalinity, and the acid resistance and the salt spray resistance of the primer are affected.
Claims (10)
1. The solvent-free wet-on-wet construction epoxy anti-corrosion primer is characterized in that: the anticorrosive paint consists of a component A and a component B, wherein the component A and the component B are prepared from the following components in parts by weight:
and (3) a component A:
10-50 parts of composite epoxy resin, 1-30 parts of an inactive diluent, 1-30 parts of pigment, 1-20 parts of antirust pigment, 10-50 parts of filler, 1-10 parts of rheological additive and 1-5 parts of dispersing agent;
and the component B comprises the following components:
90-100 parts of composite amine curing agent and 5-15 parts of reaction accelerator;
when the component A and the component B are compounded, the mass ratio of the component A to the component B is 5-30:1, a step of;
wherein: the composite epoxy resin comprises the following components in percentage by mass of 10-20:10-15 of E-44 epoxy resin and high-reactivity epoxy resin, wherein the E-44 epoxy resin is three-wood 6101 epoxy resin, and the high-reactivity epoxy resin is Dow DER 3414 or EPALLOY 7200;
the mass ratio of the composite amine curing agent is 50-70:20-40 of modified phenolic amine and quick-curing fatty amine, wherein the modified phenolic amine is selected from Cardolite NC-540, and the quick-curing fatty amine is selected from air chemistry Ancamine 1608 or Ancamine 2636;
the rust-proof pigment consists of modified orthophosphate and an organic corrosion inhibitor according to the mass ratio of 5-15:1-5, wherein the pigment at least selects at least one of titanium white powder and carbon black powder.
2. The solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 1, wherein: the component A and the component B are as follows:
and (3) a component A:
20-40 parts of composite epoxy resin, 4-8 parts of an inactive diluent, 15-25 parts of pigment, 5-15 parts of antirust pigment, 25-35 parts of filler, 1-5 parts of rheological additive and 1-5 parts of dispersing agent;
and the component B comprises the following components:
90-100 parts of composite amine curing agent and 5-15 parts of reaction accelerator.
3. The solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 1, wherein: the non-reactive diluent is selected from Cardolite LITE 2020 or Cardolite NX-2022.
4. The solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 1, wherein: the modified orthophosphate is selected from HEUCOPHOSZMP, and the organic corrosion inhibitor is selected from heucrorin RZ.
5. The solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 4, wherein: the rust-proof pigment consists of modified orthophosphate and an organic corrosion inhibitor according to the mass ratio of 6-8: 1-3.
6. The solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 1, wherein: the rheological additive comprises the following components in percentage by mass of 1-5:0.1-3 of Disparlon 3500 and Pick chemical BYK-410; the dispersing agent is BYK-2014, the filler is feldspar powder, and the mesh number is more than or equal to 1500 meshes.
7. The solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 6, wherein: the rheological additive comprises the following components in percentage by mass of 1-2:0.1-0.5 of Disparlon 3500 and Pick chemical BYK-410.
8. The solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 1, wherein: the reaction promoter is selected from Lv Tege Novares LS 500.
9. A method for preparing the solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 1, which is characterized by comprising the following steps: the method comprises the following steps:
the preparation method of the component A comprises the following steps:
firstly, uniformly stirring and dispersing the compound epoxy resin, the inactive diluent and the dispersing agent in the formula amount at a high speed to obtain a mixture; secondly, adding pigment and antirust pigment into the mixture, stirring and dispersing at a high speed, and then putting into a sand mill for grinding until the fineness is less than or equal to 40 mu m; adding filler into the ground slurry, and stirring and dispersing at high speed until the fineness is less than or equal to 40 mu m; finally, slowly and continuously adding the rheological additive under the condition that the rotating speed is controlled to be not lower than 1000r/min, and continuously stirring for 20min after the rheological additive is added to obtain a component A;
the preparation method of the component B comprises the following steps:
adding the compound amine curing agent and the reaction accelerator in the formula amount into a stirring kettle, and dispersing uniformly at a high speed.
10. The solvent-free wet-on-wet construction epoxy anti-corrosive primer according to claim 1, wherein: when the component A and the component B are compounded, the mass ratio of the component A to the component B is 10-20:1.
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| CN111393951A (en) * | 2020-04-29 | 2020-07-10 | 湘江涂料科技有限公司 | High-solid low-viscosity epoxy coating for quick-drying type engineering machinery and preparation method thereof |
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| CN110218412A (en) * | 2018-03-01 | 2019-09-10 | 浙江全米特新材料科技有限公司 | Assorted fibre prepreg |
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