CN110669413A - Thick paste type low-surface treatment moisture curing primer, preparation method and use method thereof - Google Patents
Thick paste type low-surface treatment moisture curing primer, preparation method and use 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
- C08G59/62—Alcohols or phenols
- C08G59/621—Phenols
- C08G59/623—Aminophenols
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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
- 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
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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
- 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
- C09D7/61—Additives non-macromolecular inorganic
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- 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
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
The invention provides a thick paste type low-surface treatment moisture curing primer, a preparation method and a using method thereof. The primer is formed by mixing a component A and a component B according to the mass ratio of 10: 1-1: 1; the component A comprises bisphenol A epoxy resin, butanol, xylene, a wetting dispersant, a graft coupling agent, graphene, basalt flakes, other additives, pigment and filler and the like; the component B comprises phenolic aldehyde amine curing agent, butanol, xylene, wetting dispersant, grafting coupling agent, graphene, basalt flakes, other additives, pigment and filler and the like. The primer has low requirement on surface treatment of a substrate to be coated, can be cured under a humid condition, has high single-layer coating thickness, has a compact coating structure, reduces the permeation of corrosive materials, and can be used for surface protection of the substrate in severe environments such as seawater and the like.
Description
Technical Field
The invention belongs to the technical field of paint research and preparation, and particularly relates to a thick paste type low-surface treatment moisture curing primer, and a preparation method and a use method thereof.
Background
China is the first major country in the world in the steel and ship industries, and the coating is widely used as an economic and effective anti-corrosion method. In the construction process of the paint, in order to fully exert the corrosion resistance of the paint, the steel is generally required to be subjected to complete surface treatment to Sa 21/2 grade and constructed under the condition that the relative humidity is less than 85 percent. The quality of the surface treatment is critical to the performance and lifetime of the coating.
As more and more permanent and semi-permanent large steel structures on the sea surface are put into use, the large steel structures can stand on the sea surface all the year round, and most of the large steel structures are not detachable and not movable. The most severe C-5 environment in ISO12944 corrosion classification grade is faced, which not only suffers severe corrosion of three highs and one high strength on the sea throughout the year, but also is influenced by flood tide and ebb tide, has large salinity and humidity, no fixed construction site and is extremely difficult to maintain. Most of the coating can only adopt manual mechanical grinding or sand paper and other rust removal means, and can not meet the Sa2.5 or St3 grade requirements of the traditional coating requirements at all. Offshore use is also provided with a relatively environment-friendly high-pressure water gun or wet sand blasting for rust removal, but the problem of wet rust return is also brought, and the traditional antirust paint cannot be coated.
Therefore, various anti-corrosion coatings which are suitable for low surface treatment and can be coated with moisture are produced, are more and more emphasized by various countries in the world, are developed rapidly, and are applied to various fields, but have various defects, such as a one-component modified high chlorinated polyethylene weather-resistant rust coating disclosed by the patent document with the application number of CN200810249525.3 and a chlorinated rubber rust coating disclosed by the patent document with the application number of CN201210195487.4, which are all single-component coatings, have low price and general anti-corrosion performance, cannot adapt to the severe environment of C5, and cannot realize wet-surface coating. Patent document CN201010132965.8 discloses a coating which can satisfy the coating problems with water and rust, but the comprehensive protection capability of the current water-based coating is far inferior to that of solvent-based coating, so that the coating cannot adapt to C5 severe environment, and the coating can cause problems such as incomplete drying and 'flash rust' when used in places with high environmental humidity such as seaside. The wet and rusty coating primer provided by the patent document with the application number of CN01136441.6 has low requirements on the surface, strong adhesive force and excellent physical and mechanical properties, but the system contains toxic pigments such as hexavalent chromium, diphenyl guanidine chromate and the like, an auxiliary agent and high VOC content, and does not meet the environmental protection requirements.
Therefore, the research and development of the coating which is environment-friendly, can realize the wet surface rusty coating and meets the maintenance and construction requirements of the severe environment of C5 and has excellent antirust and anticorrosive properties is of great significance.
Disclosure of Invention
Aiming at the technical current situation, the invention provides the thick paste type coating primer which has the advantages of low requirement on surface treatment of a substrate to be coated, capability of being cured under a humid condition, high single-layer coating thickness, compact structure of the obtained coating and reduction of penetration of corrosive materials.
The technical scheme provided by the invention is as follows: a thick paste type low surface treatment moisture curing primer is formed by mixing a component A and a component B according to a mass ratio of 10: 1-1: 1;
the component A comprises 30-60 parts of bisphenol A epoxy resin, 1-5 parts of butanol, 5-10 parts of xylene, 0.2-1.5 parts of wetting dispersant, 0.1-1.5 parts of graft coupling agent, 0.3-3 parts of graphene, 2-10 parts of basalt scale, 0.1-2 parts of anti-settling agent, 0.1-1.5 parts of organic corrosion inhibitor, 5-20 parts of titanium pigment and 35-45 parts of other pigment fillers;
the component B comprises 30-60 parts of phenolic aldehyde amine curing agent, 1-5 parts of butanol, 5-10 parts of xylene, 0.2-1.5 parts of wetting dispersant, 0.1-1.5 parts of graft coupling agent, 0.5-3 parts of graphene, 2-10 parts of basalt flakes, 0.1-2 parts of anti-settling agent and 35-45 parts of other pigments and fillers.
Preferably, NDJ-1 rotational viscosity of the component A is 2.0 to 5.0Pa.S, and more preferably 3.0 to 4.0 Pa.S.
Preferably, NDJ-1 rotational viscosity of the component B is 1.0 to 5.0Pa.S, and more preferably 1.5 to 2.5 Pa.S.
Preferably, the rotational viscosity of NDJ-1 obtained by mixing the component A and the component B is 2.0-5.0 Pa.S.
The bisphenol A type epoxy resin is not limited, and comprises any one or the combination of more than two of domestic epoxy resins with the types of 601, 6101, 618 and 828.
The basalt flakes are thin sheet-like materials, preferably, the thickness of the basalt flakes is 1um-7um, and the surface size of the basalt flakes is 10um-5 mm.
The other pigments and fillers are not limited, and include any one or a combination of two or more of talcum powder, mica powder, precipitated barium sulfate, iron oxide red, carbon black and the like.
The anti-settling agent includes, but is not limited to, any one or combination of more than two of fumed silica, polyamide wax powder, organic rheological agent and the like.
The graft coupling agent is not limited, and comprises any one or the combination of more than two of KH550, KH560, Dow Corning Z-6040 and Japanese Xinyue KBM-403.
The organic corrosion inhibitor comprises any one or the combination of more than two of a German Kapek organic corrosion inhibitor HEUCORIN RZ and a American Halox 550 organogel type anticorrosion inhibitor, but is not limited to the above.
The phenol-aldehyde amine curing agent includes any one or a combination of two or more of us cadley NX2016, NX2018, MD2041, MD2015 produced by medto biomaterial gmbh of shanghai, and is not limited thereto.
The invention also provides a method for preparing the thick paste type low surface treatment moisture curing primer, which comprises the steps of preparing the component A, preparing the component B and mixing the component A and the component B in proportion;
the method for preparing the component A comprises the following steps:
sequentially putting bisphenol A type epoxy resin, butanol, xylene, a wetting dispersant, a graft coupling agent, graphene and basalt flakes into a container for uniform dispersion, then adding titanium dioxide, other pigments and fillers and an organic corrosion inhibitor for uniform dispersion, and grinding until the fineness is qualified; then, the viscosity of the obtained mixture was adjusted with xylene;
the method for preparing the component B comprises the following steps:
sequentially putting a phenolic aldehyde amine curing agent, butanol, xylene, a wetting dispersant, a grafting coupling agent, graphene, basalt flakes and an anti-settling agent into a container for uniform dispersion, then adding other pigments and fillers for uniform dispersion, and grinding until the fineness is qualified; then, the viscosity of the obtained mixture was adjusted with xylene.
Preferably, in the dispersing process, high-speed rotation stirring is adopted for dispersing, the dispersing time is preferably 15-30min, and the rotating speed is preferably 2000-4000 r/min.
The thick paste type low surface treatment wet curing primer is coated on the surface of a base material, and forms a coating after crosslinking and curing, so that the thick paste type low surface treatment wet curing primer has a heavy anti-corrosion effect.
The coating method is not limited and includes spraying, rolling, brushing and airless spraying, and airless spraying is preferably adopted.
The substrate is not limited and includes metals and the like.
Compared with the prior art, the invention adopts two components to mix in proportion to form the primer, wherein the primer comprises nano-scale graphene, micron-scale basalt flakes, a graft coupling agent and a phenol-aldehyde amine curing agent, and the contents of the components are controlled, so that the primer has the following beneficial effects:
(1) the phenolic aldehyde amine curing agent is adopted to realize moisture curing and low-temperature curing
The phenolic aldehyde amine curing agent is a compound obtained by a mannich reaction based on cashew nut shell oil, formaldehyde, a specific amine, and the like. The phenolic aldehyde amine curing agent has various advantages of the Mannich curing agent, such as rapid curing, low-temperature curing (below 0 ℃), good chemical resistance, good appearance, high-humidity surface curing performance, no blushing and the like. Due to the special long aliphatic side chain of cardanol, the phenolic aldehyde amine curing agent also has the advantages of long operation period, good toughness, low surface treatment requirement, excellent water resistance, excellent salt water resistance and the like. In addition, the phenolic aldehyde amine curing agent has the characteristic of stronger hydrophobicity, and provides a plurality of advantages for the coating formula. The water sensitivity of phenolic hydroxyl and other formula components can be mutually offset, thereby reducing the damage probability of the resin bonding protective layer and improving the anticorrosion performance. The phenalkamine curing agent also exhibits good adhesion to poorly treated or wet substrate surfaces, for example, water-saturated concrete can achieve good results with phenalkamine products because the hydrophobic effect ensures that ambient moisture does not affect the resin bonding effect of the surface.
(2) Is compounded by adopting two-dimensional structural materials
The primer disclosed by the invention contains nanoscale graphene and micron-sized basalt flakes, and the nanoscale graphene and the micron-sized basalt flakes are subjected to grafting reaction with organic resin in a fully wet state, and are dispersed, so that the nanoscale graphene and the micron-sized basalt flakes are compounded with each other and uniformly dispersed in a resin system, and form a compact labyrinth effect with a filler, the structure of a coating is compact, and the chloride ion permeability resistance is greatly improved. In addition, the added inorganic pigment and filler has high inertia and low water content, the deformation is small during crosslinking and curing, the residual stress of the coating after curing is small, and the heavy-duty anticorrosion performance of the coating is enhanced.
(3) According to the invention, the mass of the solid content of the mixed component A and the component B is not lower than 75%, the mixed component A and the component B belong to a double-component thick paste type, the thickness of a dry film coated on the surface of a substrate once reaches more than 200um, even 500um, the coating times are greatly reduced, the construction efficiency is improved, and the heavy-duty anticorrosion performance of the coating is enhanced.
(4) In the invention, the component A and the component B do not contain high-valence heavy metals, the VOC content is low, and the VOC content after the component A and the component B are mixed is not higher than 350g/L, thereby being more in line with the concept of environmental protection.
Therefore, the primer disclosed by the invention is green and environment-friendly, has low requirements on surface treatment of a substrate, can be firmly attached only by removing loose rust and oil stains, and reduces the difficulty of surface treatment; the paint can be cured in a moist manner, can be constructed on the moist surface of a substrate with water, can be immediately contacted with water after film forming, and can be cured underwater, so that the paint requirement of bottom and surface integration in a surface-moist area can be met; in addition, the single-layer coating has high thickness, the obtained coating has compact structure, and the penetration of corrosive materials is reduced, so the coating can be used for protecting the surface of a substrate in severe environments such as seawater and the like.
Detailed Description
The present invention is described in further detail below with reference to examples, which are intended to facilitate the understanding of the present invention without limiting it in any way.
Example 1:
adding 30.4% of bisphenol A epoxy resin, 5% of butanol and 10% of xylene into a material mixing pot, stirring at the speed of 4000r/min for 15min, continuously adding 1.5% of wetting dispersant, 1% of grafting coupling agent, 0.4% of graphene, 10% of basalt flakes, 0.2% of anti-settling agent and 1.5% of organic corrosion inhibitor while stirring, continuously stirring at the same rotating speed for 30min, further continuously adding 5% of titanium dioxide and 35% of other pigment fillers, continuously stirring at the same rotating speed for 30min, grinding by a sand mill for less than or equal to 80 mu m, adjusting the viscosity to NDJ-1 rotational viscometer of 3.0-4.0 Pa.S by using xylene, and filtering to obtain the component A.
Adding 30% of phenolic aldehyde amine curing agent, 5% of butanol and 10% of xylene into a material mixing pot, stirring for 15min at the speed of 4000r/min, continuously adding 1.5% of wetting dispersant, 1.5% of grafting coupling agent, 1.5% of graphene, 10% of basalt scale and 0.2% of anti-settling agent while stirring, continuously stirring for 15min at the same rotating speed, further adding 40.3% of other pigments and fillers, stirring for 30min, grinding the mixture by a sand mill to the fineness of less than or equal to 80 microns, adjusting the viscosity by xylene to NDJ-1 rotational viscometer of 1.5-2.5 Pa.S, and filtering to obtain the component B.
Uniformly mixing the component A and the component B according to the mass ratio of 2:1, and coating the mixture on the surface of a substrate to form a film so as to obtain a thick paste type low-surface-treatment wet cured graphene composite basalt flake primer coating.
Example 2:
the component A is 100 parts by total mass, 56.8 parts of bisphenol A epoxy resin, 1 part of butanol and 5 parts of xylene are added into a material mixing pot and stirred for 30min at the speed of 2000r/min, 0.3 part of wetting dispersant, 0.2 part of graft coupling agent, 0.2 part of graphene, 6 parts of basalt flakes, 1.0 part of anti-settling agent and 0.8 part of organic corrosion inhibitor are continuously added while stirring, the mixture is continuously stirred for 15min at the same rotating speed, 20 parts of titanium dioxide and 8.7 parts of other pigment fillers are continuously added, the mixture is continuously stirred for 15min at the same rotating speed, the fineness is not more than 80 mu m by a sand mill, the viscosity is adjusted to NDJ-1 rotational viscometer of 3.0-4.0 Pa.S by xylene, and the component A is obtained by filtering.
The total mass part of the component B is 100 parts, 60 parts of phenolic aldehyde amine curing agent, 1 part of butanol and 5 parts of xylene are added into a material mixing pot and stirred for 30min at the speed of 2000r/min, 0.2 part of wetting dispersant, 0.4 part of graft coupling agent, 0.2 part of graphene, 5 parts of basalt flakes and 2 parts of anti-settling agent are continuously added while stirring for 30min at the same rotating speed, then other pigment and filler are continuously added, stirring is carried out for 15min, the fineness is not more than 80 mu m after grinding by a sand mill, the viscosity is adjusted to NDJ-1 rotational viscometer 1.5-2.5 Pa.S by using xylene, and the component B is obtained after filtering.
Uniformly mixing the component A and the component B according to the mass ratio of 2:1, and coating the mixture on the surface of a substrate to form a film so as to obtain a thick paste type low-surface-treatment wet cured graphene composite basalt flake primer coating.
Example 3:
the component A is 100 parts in total mass, 45 parts of bisphenol A epoxy resin, 3 parts of butanol and 7.5 parts of xylene are added into a material mixing pot and stirred at the speed of 3000r/min for 20min, 1 part of wetting dispersant, 1 part of graft coupling agent, 1.5 parts of graphene, 6 parts of basalt flakes, 0.2 part of anti-settling agent and 0.2 part of organic corrosion inhibitor are continuously added while stirring, the mixture is continuously stirred at the same rotating speed for 20min, 13 parts of titanium dioxide and 21.6 parts of other pigments and fillers are continuously added, the mixture is continuously stirred at the same rotating speed for 20min, the mixture is ground by a sand mill until the fineness is less than or equal to 80 mu m, the viscosity is adjusted to NDJ-1 rotational viscometer of 3.0-4.0 Pa.S by using xylene, and the component A is obtained by filtering.
The component B is 100 parts by total mass, 45 parts of phenolic aldehyde amine curing agent, 3 parts of butanol and 7.5 parts of xylene are added into a material mixing pot and stirred at the speed of 3000r/min for 20min, 1 part of wetting dispersant, 1 part of graft coupling agent, 1 part of graphene, 2 parts of basalt scale and 1 part of anti-settling agent are continuously added while stirring at the same rotating speed and stirred for 20min, then 38.5 parts of other pigment and filler are continuously added, stirring is carried out for 20min, the fineness is not more than 80 mu m after grinding through a sand mill, the viscosity is adjusted to NDJ-1 rotational viscometer of 1.5-2.5 Pa.S by using xylene, and the component B is obtained after filtration.
Uniformly mixing the component A and the component B according to the mass ratio of 2:1, and coating the mixture on the surface of a substrate to form a film so as to obtain a thick paste type low-surface-treatment wet cured graphene composite basalt flake primer coating.
Comparative example 1:
the preparation method and the component ratio are the same as those of the example 1, except that the phenolic aldehyde amine curing agent is replaced by the polyamide curing agent.
Comparative example 2:
the preparation method and the component proportion are the same as those of the example 2, except that graphene and basalt flakes are absent.
Comparative example 3:
the preparation method and the ratio of the components are the same as those of example 3, except that the graft coupling agent is absent.
The coatings prepared in examples 1-3 and comparative examples 1-3 were tested, and the results are detailed in Table 1.
TABLE 1 results of the Performance test of coatings prepared from the coatings of examples 1-3 and comparative examples 1-3
Partial index test description:
1 adhesion
1.1 circle drawing method: the primer is tested separately and is carried out according to the GB/T9286-1988;
1.2 pulling method: according to the regulations of GB/T5210-2006.
1.2.1 alone: the independent test antirust paint specifically comprises the following steps: and (3) coating one time, wherein the thickness of a dry film is 60-70 um, and testing is carried out after the state after coating is adjusted for 7 days.
1.2.2 matching: the ship bottom antirust paint matching system with complete test comprises the following components: spraying HT-1 aluminum powder once, the dry film thickness is 125um +/-10 um, HT-1 aluminum red, iron red or ash and the like once, the dry film thickness is 125um +/-10 um, the total dry film thickness of the coating is 250um +/-10 um, the coating interval is 24h, the state after the second coating is adjusted for 7 days, and then carrying out the test.
2 resistance to soaking
2.1 sample size and test method: 150mm × 300mm × 3mm, surface roughness Ra of 40-80 um, and plate making and test conditions specified in GB/T10834-.
2.2 the project is the measurement after matching, and the matching system, coating thickness, coating interval and state adjustment are the same as 1.2.2.
2.3 according to 4.3.2 as specified in GB/T6822-2014. The results were evaluated according to the method GB/T1766-2008. If the "first 10 cycles (70d) of the soak test did not blister beyond the 1(S2) rating or other surface defect, but the growth rate was slow or insignificant, it was not counted. After 20 soaking periods (140d) are finished, the rusting of the paint film is not more than 1(S2), the blistering is not more than 2(S3), and the change of the appearance color is not more than 1. And (4) after soaking, determining that the adhesion force of the recoated surface antirust paint system is not less than 50% of the adhesion force of the recoated surface.
3 resistance to blistering
3.1 according to GB/T6822-2014 specification 5.11.
3.2 the item is the measurement after matching, and the matching system, the coating thickness, the coating interval and the state are regulated to be 1.2.2.
4 cathodic disbondment resistance/compatibility with cathodic protection
4.1 the single rust inhibitive paint system was tested for cathodic disbondment resistance as specified in GB/T7790-2008. After the test, the average distance between the stripped coating and the outer edge of the artificial holiday hole is not more than 8mm, namely the calculated equivalent circle diameter of the stripped coating around the whole artificial holiday hole is 19 mm. After the project is matched, the matching system, the coating thickness, the coating interval and the state are regulated to be 1.2.2.
4.2 antifouling and rust-proof system is tested according to 5.16 in GB/T6822-2014 specification and is compatible with cathodic protection. The project is matched and then measured, and the matching system is as follows: one line of HT-1 aluminum powder is sprayed, the thickness of the dry film is 125um +/-10 um, one line of HT-1 aluminum red, the thickness of the dry film is 125um +/-10 um, one line of J160/J160A chlorinated rubber thick paste antirust paint, the thickness of the dry film is 50um +/-10 um, three to four lines of B300 acrylic acid antifouling paint or J300 chlorinated rubber antifouling paint, the thickness of the dry film is 300um +/-10 um, the total thickness of the dry film of the coating is 600um +/-10 um, the coating interval is 24h, and the test is carried out within 16h to 36h after the last line of coating. After the test is finished, the test can reach GB/T6822-2014
4.2.2 is qualified.
5 salt spray resistance
5.1 according to GB/T1771-2007.
5.2 this project is single antirust paint salt spray resistance test, and the plate manufacturing method is: and (3) spraying the antirust paint to be tested for two times, wherein the total dry film thickness is 140 microns +/-10 microns, the coating interval is 24 hours, the state is adjusted for 7 days after the second spraying, and then testing is carried out.
6 oil resistance
The method is carried out according to the method A specified in GB/T9274-1988. After the project is matched, the test is carried out, and the matching system, the coating thickness, the coating interval and the state are adjusted to be 1.2.2.
7 moisture curability
Taking a 2mm carbon steel plate, polishing two sides of the carbon steel plate to St3 by using sand paper, then soaking the carbon steel plate in tap water for 24 hours, taking out the carbon steel plate, airing the carbon steel plate until the carbon steel plate is coated with water in a wet state without dripping, wherein the thickness of a dry film is 60-70 mu m, and carrying out an adhesion pull-off method test after the state after coating is adjusted for 7 days. The test was carried out as specified in GB/T5210-.
It can be seen clearly from the comparison that the selection of the curing agent, the coupling agent and the two-dimensional structure material plays a very critical role in the performance of the product, and in addition, the proportioning performance of the resin, the curing agent, the two-dimensional structure material and the like determines the crosslinking density and the corrosion resistance of the coating.
The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A thick paste type low surface treatment moisture curing primer is characterized in that: the paint is formed by mixing a component A and a component B according to the mass ratio of 10: 1-1: 1;
the component A comprises 30-60 parts of bisphenol A epoxy resin, 1-5 parts of butanol, 5-10 parts of xylene, 0.2-1.5 parts of wetting dispersant, 0.1-1.5 parts of graft coupling agent, 0.3-3 parts of graphene, 2-10 parts of basalt scale, 0.1-2 parts of anti-settling agent, 0.1-1.5 parts of organic corrosion inhibitor, 5-20 parts of titanium pigment and 35-45 parts of other pigment fillers;
the component B comprises 30-60 parts of phenolic aldehyde amine curing agent, 1-5 parts of butanol, 5-10 parts of xylene, 0.2-1.5 parts of wetting dispersant, 0.1-1.5 parts of graft coupling agent, 0.5-3 parts of graphene, 2-10 parts of basalt flakes, 0.1-2 parts of anti-settling agent and 35-45 parts of other pigments and fillers.
2. The mastic low surface treatment moisture cure primer of claim 1, wherein: the rotational viscosity of NDJ-1 of the component A is 2.0-5.0 Pa.S;
preferably, the NDJ-1 rotational viscosity of the component B is 2.0-5.0 Pa.S.
3. The mastic low surface treatment moisture cure primer of claim 1, wherein: the rotational viscosity of the mixed NDJ-1 of the component A and the component B is 2.0-5.0 Pa.S.
4. The mastic low surface treatment moisture cure primer of claim 1, wherein: the other pigments and fillers comprise any one or the combination of two or more of talcum powder, mica powder, precipitated barium sulfate, iron oxide red and carbon black;
preferably, the anti-settling agent comprises any one or a combination of more than two of fumed silica, polyamide wax powder and an organic rheological agent.
5. The mastic low surface treatment moisture cure primer of claim 1, wherein: the solid content is greater than or equal to 75 percent by mass.
6. The method for preparing a mastic low surface treatment moisture-curable primer according to any one of claims 1 to 5, characterized in that: comprises a step of preparing a component A, a step of preparing a component B and a step of mixing the component A and the component B according to a proportion;
the method for preparing the component A comprises the following steps:
sequentially putting bisphenol A type epoxy resin, butanol, xylene, a wetting dispersant, a graft coupling agent, graphene and basalt flakes into a container for uniform dispersion, then adding titanium dioxide, other pigments and fillers and an organic corrosion inhibitor for uniform dispersion, and grinding until the fineness is qualified; then, the viscosity of the obtained mixture was adjusted with xylene;
the method for preparing the component B comprises the following steps:
sequentially putting a phenolic aldehyde amine curing agent, butanol, xylene, a wetting dispersant, a grafting coupling agent, graphene, basalt flakes and an anti-settling agent into a container for uniform dispersion, adding other pigments and fillers for uniform dispersion, and grinding until the fineness is qualified; then, the viscosity of the obtained mixture was adjusted with xylene.
7. The method of preparing a mastic low surface treatment moisture cure primer as claimed in claim 6, wherein: stirring and dispersing at high speed for 15-30min at 2000-4000 r/min.
8. The method of using a mastic low surface treatment moisture curable primer according to any of claims 1 to 5, wherein: and (3) coating the thick paste type low surface treatment wet curing primer on the surface of the base material, and crosslinking and curing to obtain the coating.
9. The method of using a mastic low surface treatment moisture cure primer as claimed in claim 8, wherein: the coating method comprises spraying, roller coating and brush coating;
preferably, the spray coating is an airless spray coating.
10. The method of using a mastic low surface treatment moisture cure primer as claimed in claim 8, wherein: the thickness of the coating after single coating is more than 200 um;
preferably, the coating thickness after a single application is up to 500 um.
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| CN201911077361.5A CN110669413A (en) | 2019-11-06 | 2019-11-06 | Thick paste type low-surface treatment moisture curing primer, preparation method and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112266692A (en) * | 2020-10-29 | 2021-01-26 | 湖南省德谦新材料有限公司 | Graphene low-surface-treatment epoxy thick paste coating |
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| CN114539885B (en) * | 2022-04-13 | 2022-08-16 | 中国科学院宁波材料技术与工程研究所 | Special high-permeability moisture-curing seal primer for concrete and preparation method and application thereof |
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