CN114686070A - Water-based epoxy zinc-rich primer and preparation method thereof - Google Patents

Water-based epoxy zinc-rich primer and preparation method thereof Download PDF

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Publication number
CN114686070A
CN114686070A CN202011585164.7A CN202011585164A CN114686070A CN 114686070 A CN114686070 A CN 114686070A CN 202011585164 A CN202011585164 A CN 202011585164A CN 114686070 A CN114686070 A CN 114686070A
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component
curing agent
agent
rich primer
modified
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Inventor
刘明
左慧明
张汉青
祝宝英
刘汉功
刘睿
陈力
庄振宇
许飞
周丽
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China National Offshore Oil Corp CNOOC
CNOOC Energy Technology and Services Ltd
CNOOC Changzhou EP Coating Co Ltd
CNOOC Changzhou Paint and Coatings Industry Research Institute Co Ltd
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China National Offshore Oil Corp CNOOC
CNOOC Energy Technology and Services Ltd
CNOOC Changzhou EP Coating Co Ltd
CNOOC Changzhou Paint and Coatings Industry Research Institute Co Ltd
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Priority to CN202011585164.7A priority Critical patent/CN114686070A/en
Publication of CN114686070A publication Critical patent/CN114686070A/en
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • C09D7/43—Thickening agents
    • 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
    • C09D7/63—Additives non-macromolecular organic
    • 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
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention discloses a water-based epoxy zinc-rich primer and a preparation method thereof, wherein the water-based epoxy zinc-rich primer is composed of a component A and a component B in a mass ratio of 3:1-4.5:1, wherein the component A comprises modified epoxy resin, a film-forming assistant, a dispersing agent, a rheological assistant, a defoaming agent, an adhesion promoter, fumed silica, organic bentonite, zinc powder and a zinc powder protective agent; the component B comprises: modified amine epoxy curing agent, phenolic aldehyde amine epoxy curing agent, hydroxyethyl cellulose ether, rheological additive, flash rust inhibitor and pure water. A paint film obtained by adopting the water-based epoxy zinc-rich primer disclosed by the invention has excellent corrosion resistance and humidity resistance.

Description

Water-based epoxy zinc-rich primer and preparation method thereof
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a water-based epoxy zinc-rich primer and a preparation method thereof.
Background
The zinc-rich coating has excellent protective performance on base materials, and is widely applied to the anticorrosion fields of offshore platforms, wharfs and other marine facilities, petrochemical engineering pipelines, storage tanks and the like. In addition, the epoxy zinc-rich coating is simple and convenient to construct, has low requirements on the pretreatment of a base material, has strong adhesion and high hardness of a coating film, is not easy to crack and damage, is matched with other intermediate paint and finish paint, has good compatibility, and better meets the overall requirements of the industry on a paint film coating. At present, most of common water-based epoxy zinc-rich paint in the market is a three-component system, the construction process is complex, and great inconvenience is caused to on-site construction spraying. A few of two-component water-based epoxy zinc-rich paint systems have poor corrosion resistance in the practical application process, or have good corrosion resistance but poor humidity resistance, a paint film is easy to foam and rust under the conditions of high temperature and high humidity, and the product is difficult to take the corrosion resistance and the humidity resistance into consideration; meanwhile, part of products have poor stability, hard precipitates are easy to form, and the products are extremely easy to sag in the construction process and cannot adapt to the requirements of site construction processes.
Disclosure of Invention
Aiming at the technical defects in the prior art, the invention provides the water-based epoxy zinc-rich primer with excellent corrosion resistance and humidity resistance and simultaneously has good anti-sagging performance. In addition, the invention also provides a preparation method of the water-based epoxy zinc-rich primer.
A waterborne epoxy zinc-rich primer is mainly composed of a component A and a component B, wherein the mass ratio of the component A to the component B is 3:1-4.5: 1; the component A comprises the following components in percentage by mass:
Figure BDA0002866591970000011
Figure BDA0002866591970000021
the component B comprises the following components in percentage by mass:
Figure BDA0002866591970000022
in one embodiment, the modified epoxy resin in the component A has a solid content of 75%, and an epoxy equivalent weight of 500-675; the dispersant is a water-free high-molecular modified acrylic copolymer; the rheological additive is polyurea rheological additive; the adhesion promoter is a silane coupling agent; the defoaming agent is a modified organic silicon defoaming agent.
In one embodiment, the rheology assistant in the component B is at least any one of hydroxyethyl cellulose ether and polyurethane thickener.
In one embodiment, the mass ratio of the A component to the B component is 4: 1.
In one embodiment, in the component B, the total amount of the modified amine epoxy curing agent and the phenolic aldehyde amine epoxy curing agent accounts for 15-23% by mass.
In one embodiment, in the component B, the modified amine epoxy curing agent is a self-emulsifying modified aliphatic amine curing agent.
In one embodiment, the phenolic aldehyde amine epoxy curing agent is a cardanol modified amine curing agent, which is also called a natural long-chain substituted phenolic aldehyde amine curing agent, and contains aliphatic amino groups, weakly acidic phenolic hydroxyl groups, and a long chain containing double bonds C15 on a benzene ring.
The modified epoxy resin is characterized in that some polymers containing amino and hydrophilic polyether groups are introduced onto the molecular chain of the epoxy resin through a grafting reaction, namely, the modified epoxy resin is grafted with the polymers containing the amino and the hydrophilic polyether groups.
In one embodiment, the modified amine epoxy curing agent is a Hensmei 38-1 type modified amine epoxy curing agent.
In one embodiment, the phenolic amine epoxy curing agent is a phenolic amine epoxy curing agent of type NX-8101 of cadley.
The preparation method of the water-based epoxy zinc-rich primer comprises the following steps:
(1) premixing the modified epoxy resin, the dispersing agent and the film-forming additive for 10min under a low-speed stirring state, continuously adding the rheological additive, the defoaming agent, the adhesion promoter and the zinc powder protective agent, and stirring for 10min until the system is uniform;
then adding 500-mesh zinc powder into the mixture, and dispersing the mixture at a high speed for 30-40 min at a rotating speed of 1200-1500 rmp/min until the fineness is lower than 60 mu m; adding organic bentonite to adjust the viscosity of the system, and continuously dispersing for 10-15 min to obtain a component A;
(2) uniformly mixing the waterborne epoxy curing agent, pure water, the defoaming agent, the flash rust prevention agent and the thickening agent under a stirring state to obtain a mixture of the waterborne epoxy curing agent; adding the rheological additive into the mixture at a rotating speed of 500rmp/min, and uniformly dispersing for 10-15 min to obtain a component B;
(3) and uniformly mixing the component A and the component B according to the mass ratio of 3:1-4.5:1 to obtain the water-based epoxy zinc-rich primer.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the phenolic amine epoxy curing agent is introduced on the basis of the original modified amine curing agent, and two different types of modified amine curing agents are compounded, so that the problem that some marine facilities such as offshore platforms and docks are easy to rust under high humidity and heat conditions is solved to a certain extent, the salt spray resistance reaches over 800 hours, the humidity and heat resistance reaches over 280 hours, and a paint film has excellent corrosion resistance and humidity and heat resistance.
(2) According to the invention, proper rheological additives are respectively selected from the main agent and the curing agent of the zinc-rich primer, so that the storage stability of the zinc-rich primer is improved, and the dilution stability and the sagging resistance during spraying are increased, so that the coating has good construction performance.
(3) According to the invention, by selecting a proper defoaming agent, the generation of penetrating pinholes after a paint film is dried is avoided to the maximum extent, and the corrosion resistance of the zinc-rich primer is greatly improved.
(4) The two-component water-based epoxy zinc-rich paint prepared by the invention has the characteristics of low VOC content and small smell, and meets the national requirements on environmental protection, VOC restriction and health and safety of construction workers.
Detailed Description
While specific embodiments of the invention are described further below, it should be apparent that the described embodiments are merely exemplary of some, and not all, embodiments of the invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
The waterborne epoxy zinc-rich primer mainly comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 3:1-4.5: 1; the component A comprises the following components in percentage by mass:
Figure BDA0002866591970000041
the component B comprises the following components in percentage by mass:
Figure BDA0002866591970000042
Figure BDA0002866591970000051
in one embodiment, the mass ratio of the A component to the B component is 4: 1.
The solid part of the modified epoxy resin in the component A is 75 percent, and the epoxy equivalent is 500-675; the dispersing agent is a water-free high-molecular modified acrylic copolymer, has good anti-flocculation performance on the pigment, and can effectively improve the pigment which is difficult to disperse; the rheological additive is polyurea rheological additive and is characterized in that a three-dimensional network structure can be formed after stirring during paint preparation, high thixotropic property is generated to prevent sedimentation and sag resistance is improved; the adhesion promoter is a silane coupling agent and is characterized in that a covalent bond with strong bonding force can be formed with an inorganic base material, so that a connecting paint film and the base material have strong bonding force and are difficult to peel; the defoaming agent is a modified organic silicon defoaming agent, and is characterized by high defoaming speed and strong microbubble eliminating capability, and the paint film is greatly prevented from generating penetrating pinholes in the coating process.
The rheological additive in the component B is at least one of hydroxyethyl cellulose ether and polyurethane thickening agent, and is characterized by having excellent anti-sagging property, minimizing the influence on the flowing and leveling property, and endowing the coating with good thixotropy.
In the component B, the total amount of the modified amine epoxy curing agent and the phenolic aldehyde amine epoxy curing agent accounts for 15-23% by mass, the modified amine epoxy curing agent is a self-emulsifying modified aliphatic amine curing agent, the phenolic aldehyde amine epoxy curing agent is a cardanol modified amine curing agent, also called natural long-chain substituted phenolic aldehyde amine curing agent, and contains aliphatic amino, weakly acidic phenolic hydroxyl and a long chain containing double bonds C15 on a benzene ring. Further, the modified amine epoxy curing agent is a Hensmei 38-1 type modified amine epoxy curing agent; the phenolic aldehyde amine epoxy curing agent is an NX-8101 type phenolic aldehyde amine epoxy curing agent of Cadelley.
The modified epoxy resin is characterized in that some polymers containing amino and hydrophilic polyether groups are introduced onto the molecular chain of the epoxy resin through a grafting reaction, namely, the modified epoxy resin is grafted with the polymers containing the amino and the hydrophilic polyether groups.
The preparation method of the water-based epoxy zinc-rich primer comprises the following steps:
(1) premixing the modified epoxy resin, the dispersing agent and the film-forming additive for 10min under a low-speed stirring state, continuously adding the rheological additive, the defoaming agent, the adhesion promoter and the zinc powder protective agent, and stirring for 10min until the system is uniform;
then adding 500-mesh zinc powder into the mixture, and dispersing the mixture at a high speed for 30-40 min at a rotating speed of 1200-1500 rmp/min until the fineness is lower than 60 mu m; adding organic bentonite to adjust the viscosity of the system, and continuously dispersing for 10-15 min to obtain a component A;
(2) uniformly mixing the waterborne epoxy curing agent, pure water, the defoaming agent, the flash rust prevention agent and the thickening agent in a stirring state to obtain a mixture of the waterborne epoxy curing agent; adding the rheological additive into the mixture at the rotating speed of 500rmp/min, and uniformly dispersing for 10-15 min to obtain a component B;
(3) and uniformly mixing the component A and the component B according to the mass ratio of 3:1-4.5:1 to obtain the water-based epoxy zinc-rich primer.
The raw materials referred to in the examples include:
modified epoxy resin: PZ3963 modified epoxy, technical grade, hensman; dispersing agent: 728w, technical grade, U.S. digao; an adhesion promoter: MP-200, technical, My graphic New Material; film-forming auxiliary agent: propylene glycol methyl ether acetate, technical grade, timbre chemical; zinc powder: 500 mesh zinc powder, Jiangsu Kecheng New Material science and technology Limited; fumed silica: r-972, technical grade, degussa; polyurea rheological aid: byk-425, technical grade, bick chemistry; 901W of defoaming agent, industrial grade, American digao; organic bentonite: SD-2, industrial grade, hamming modesty; zinc powder protective agent: KH-561, Industrial grade, Anhui silicon treasure; modified amine epoxy curing agent: 38-1, industrial grade, hensimei; phenolic amine epoxy curing agent: NX-8101, technical grade, cadeland; hydroxyethyl cellulose ether: 250HBR, technical grade, Ashland; polyurethane rheological aid: RM-12W, technical grade, Rohm and Haas; anti-flash rust additive: FR355, technical grade, commonly known.
Example 1
A water-based epoxy zinc-rich primer with excellent corrosion resistance and damp-heat resistance consists of a component A and a component B.
Wherein the component A comprises: 13.2kg of modified epoxy resin, 0.5kg of dispersing agent, 4.6kg of film forming additive, 79.8kg of zinc powder, 0.2kg of fumed silica, 0.3kg of polyurea rheological additive, 0.6kg of adhesion promoter, 0.2kg of defoaming agent, 0.63kg of organic bentonite and 0.3kg of zinc powder protective agent; the component B comprises: 5.2kg of modified amine epoxy curing agent, 7.6kg of phenolic aldehyde amine epoxy curing agent, 2.8kg of hydroxyethyl cellulose ether, 3.6kg of polyurethane rheological additive, 1.0kg of flash rust prevention additive and 79.8kg of pure water.
Wherein the component A is prepared by the following steps: premixing modified epoxy resin, a dispersing agent and a film-forming additive for 10min under a low-speed stirring state according to a certain proportion, continuously adding a rheological additive, a defoaming agent, an adhesion promoter, fumed silica and a zinc powder protective agent according to a certain proportion, stirring for 10min until a system is uniform, and adding 500-mesh zinc powder into the mixture; dispersing at high speed for 30-40 min at the rotating speed of 1200-1500 rmp/min until the fineness is lower than 60 mu m; adding organic bentonite to adjust the viscosity of the system, and continuously dispersing for 10-15 min to obtain the component A.
Wherein the component B is prepared by the following steps: uniformly mixing the modified amine epoxy curing agent, the phenolic amine epoxy curing agent, pure water, the defoaming agent, the anti-flash rust additive and the hydroxyethyl cellulose ether in proportion under a stirring state to obtain a mixture of the water-based epoxy curing agent; and adding the polyurethane rheological additive into the mixture at the rotating speed of 500rmp/min, and uniformly dispersing for 10-15 min to obtain the component B.
And evenly mixing the A, B components according to the ratio of 4:1 to obtain the two-component water-based epoxy zinc-rich primer. During construction, 20% of tap water is required to be added for dilution, and the components are uniformly mixed and adjusted to proper construction viscosity.
Example 2
A water-based epoxy zinc-rich primer with excellent corrosion resistance and moist heat resistance consists of a component A and a component B.
Wherein the component A comprises: 14.6kg of modified epoxy resin, 0.5kg of dispersing agent, 4.0kg of film forming additive, 78.2kg of zinc powder, 0.4kg of fumed silica, 0.5kg of polyurea rheological additive, 0.4kg of adhesion promoter, 0.4kg of defoaming agent, 0.5kg of organic bentonite and 0.5kg of zinc powder protective agent; the component B comprises: 6.1kg of modified amine epoxy curing agent, 9.3kg of phenolic aldehyde amine epoxy curing agent, 2.3kg of hydroxyethyl cellulose ether, 3kg of polyurethane rheological additive, 0.8kg of flash rust prevention additive and 78.5kg of pure water.
Wherein the component A is prepared by the following steps: premixing modified epoxy resin, a dispersing agent and a film-forming additive for 10min under a low-speed stirring state according to a certain proportion, continuously adding a rheological additive, a defoaming agent, an adhesion promoter, fumed silica and a zinc powder protective agent according to a certain proportion, stirring for 10min until a system is uniform, and adding 500-mesh zinc powder into the mixture; dispersing at high speed for 30-40 min at the rotating speed of 1200-1500 rmp/min until the fineness is lower than 60 mu m; adding organic bentonite to adjust the viscosity of the system, and continuously dispersing for 10-15 min to obtain the component A.
Wherein the component B is prepared by the following steps: uniformly mixing a modified amine epoxy curing agent, a phenolic amine epoxy curing agent, pure water, a defoaming agent, an anti-flash rust auxiliary agent and ethyl cellulose ether in a stirring state according to a proportion to obtain a mixture of a water-based epoxy curing agent; and adding the polyurethane rheological additive into the mixture at the rotating speed of 500rmp/min, and uniformly dispersing for 10-15 min to obtain the component B.
The A, B components are uniformly mixed according to the proportion of 4:1 to obtain the two-component water-based epoxy zinc-rich primer. During construction, 20% of tap water is required to be added for dilution, and the components are uniformly mixed and adjusted to proper construction viscosity.
Example 3
A water-based epoxy zinc-rich primer with excellent corrosion resistance and moist heat resistance consists of a component A and a component B.
Wherein the component A comprises: 15.7kg of modified epoxy resin, 0.6kg of dispersing agent, 3.5kg of film forming additive, 77.3kg of zinc powder, 0.4kg of fumed silica, 0.6kg of polyurea rheological additive, 0.5kg of adhesion promoter, 0.5kg of defoaming agent, 0.6kg of organic bentonite and 0.3kg of zinc powder protective agent; the component B comprises: 7.9kg of modified amine epoxy curing agent, 11.9kg of phenolic aldehyde amine epoxy curing agent, 1.7kg of hydroxyethyl cellulose ether, 2.5kg of polyurethane rheological additive, 0.6kg of flash rust prevention additive and 75.4kg of pure water.
Wherein the component A is prepared by the following steps: premixing modified epoxy resin, a dispersing agent and a film-forming additive for 10min under a low-speed stirring state according to a certain proportion, continuously adding a rheological additive, a defoaming agent, an adhesion promoter, fumed silica and a zinc powder protective agent according to a certain proportion, stirring for 10min until a system is uniform, and adding 500-mesh zinc powder into the mixture; dispersing at high speed for 30-40 min at the rotating speed of 1200-1500 rmp/min until the fineness is lower than 60 mu m; adding organic bentonite to adjust the viscosity of the system, and continuously dispersing for 10-15 min to obtain the component A.
Wherein the component B is prepared by the following steps: uniformly mixing a modified amine epoxy curing agent, a phenolic amine epoxy curing agent, pure water, a defoaming agent, an anti-flash rust auxiliary agent and ethyl cellulose ether in a stirring state according to a proportion to obtain a mixture of a water-based epoxy curing agent; and adding the polyurethane rheological additive into the mixture at the rotating speed of 500rmp/min, and uniformly dispersing for 10-15 min to obtain the component B.
The A, B components are uniformly mixed according to the proportion of 4:1 to obtain the two-component water-based epoxy zinc-rich primer. During construction, 20% of tap water is required to be added for dilution, and the components are uniformly mixed and adjusted to proper construction viscosity.
Example 4
A water-based epoxy zinc-rich primer with excellent corrosion resistance and moist heat resistance consists of a component A and a component B.
Wherein the component A comprises: 16.9kg of modified epoxy resin, 0.7kg of dispersing agent, 3.6kg of film forming additive, 76kg of zinc powder, 0.3kg of gas phase silicon dioxide, 0.7kg of polyurea rheological additive, 0.7kg of adhesion promoter, 0.3kg of defoaming agent, 0.4kg of organic bentonite and 0.4kg of zinc powder protective agent; the component B comprises: 9.7kg of modified amine epoxy curing agent, 14.6kg of phenolic aldehyde amine epoxy curing agent, 1.2kg of hydroxyethyl cellulose ether, 2kg of polyurethane rheological additive, 0.5kg of flash rust prevention additive and 72kg of pure water.
Wherein the component A is prepared by the following steps: premixing modified epoxy resin, a dispersing agent and a film-forming additive for 10min under a low-speed stirring state according to a certain proportion, continuously adding a rheological additive, a defoaming agent, an adhesion promoter, fumed silica and a zinc powder protective agent according to a certain proportion, stirring for 10min until a system is uniform, and adding 500-mesh zinc powder into the mixture; dispersing at high speed for 30-40 min at the rotating speed of 1200-1500 rmp/min until the fineness is lower than 60 mu m; adding organic bentonite to adjust the viscosity of the system, and continuously dispersing for 10-15 min to obtain the component A.
Wherein the component B is prepared by the following steps: uniformly mixing a modified amine epoxy curing agent, a phenolic amine epoxy curing agent, pure water, a defoaming agent, an anti-flash rust auxiliary agent and ethyl cellulose ether in a stirring state according to a proportion to obtain a mixture of a water-based epoxy curing agent; and adding the polyurethane rheological additive into the mixture at the rotating speed of 500rmp/min, and uniformly dispersing for 10-15 min to obtain the component B.
The A, B components are uniformly mixed according to the proportion of 4:1 to obtain the two-component water-based epoxy zinc-rich primer. During construction, 20% of tap water is required to be added for dilution, and the components are uniformly mixed and adjusted to proper construction viscosity.
The performance of the primer is tested according to the corresponding national standard respectively by using a ground tinplate and a sand blasting steel plate as base materials, spraying the base materials through a spray gun, controlling the thickness of the primer film to be 40-60 mu m, baking the base materials for 30min at 70 ℃ or air drying the base materials for 7 days, and testing the performance of the paint and the performance of the paint film according to the corresponding national standard respectively shown in Table 1.
Testing the performance of the coating and the paint film: examples 1-4 were spray coated to prepare panels according to national standard requirements, wherein the VOC of the coating was tested according to GB/T23986; the non-volatile fraction is tested according to GB/T1725-2007; the storage stability is tested according to GB/T6753.3-1986; the impact resistance of the paint film was tested according to GB/T1732-1993; the water resistance is tested according to GB/T1733-93, the salt spray resistance is tested according to GB/T1771-2007, the adhesion is tested according to GB/T9286-98, the humidity resistance is tested according to GB/T1740-2007, and the sag resistance of the coating is tested according to GB 9264-1988.
TABLE 1 waterborne epoxy Zinc-rich primer coating and film Properties
Figure BDA0002866591970000101
As can be seen from the above table, the two-component water-based epoxy zinc-rich primer provided by the invention has the characteristics of excellent corrosion resistance, humidity resistance and low VOC (volatile organic compound), and increases the sagging resistance during spraying on the premise of ensuring the long-term storage stability, so that the coating has good construction performance.
According to the invention, the phenolic amine epoxy curing agent is introduced on the basis of the original modified amine curing agent, and two different types of modified amine curing agents are compounded, so that the obtained paint film has excellent corrosion resistance and humidity resistance, and the problem that some marine facilities such as offshore platforms and wharfs are easy to rust under high-humidity and high-heat conditions is solved to a certain extent; the added hydroxyethyl cellulose ether and polyurea rheological additive improve the anti-sagging property of the paint system and endow the paint with good construction property.
While the present invention has been described in further detail with reference to the preferred embodiments, it is not intended to limit the invention to the details of the embodiments, and it will be apparent to those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. The water-based epoxy zinc-rich primer is characterized by comprising the following components in parts by weight: the waterborne epoxy zinc-rich primer mainly comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 3:1-4.5: 1; the component A comprises the following components in percentage by mass:
Figure FDA0002866591960000011
the component B comprises the following components in percentage by mass:
Figure FDA0002866591960000012
。
2. the waterborne epoxy zinc rich primer of claim 1, wherein: the solid part of the modified epoxy resin in the component A is 75 percent, and the epoxy equivalent is 500-675; the dispersant is a non-aqueous high-molecular modified acrylic copolymer; the rheological additive is polyurea rheological additive; the adhesion promoter is a silane coupling agent; the defoaming agent is a modified organic silicon defoaming agent.
3. The waterborne epoxy zinc rich primer of claim 1, wherein: the rheological additive in the component B is at least one of hydroxyethyl cellulose ether and a polyurethane thickener.
4. The waterborne epoxy zinc rich primer of claim 1, wherein: the mass ratio of the component A to the component B is 4: 1.
5. The waterborne epoxy zinc rich primer of claim 1, wherein: in the component B, the total amount of the modified amine epoxy curing agent and the phenolic aldehyde amine epoxy curing agent accounts for 15-23% by mass.
6. The waterborne epoxy zinc rich primer of claim 1, wherein: the modified amine epoxy curing agent is a self-emulsifying modified aliphatic amine curing agent.
7. The waterborne epoxy zinc rich primer of claim 1, wherein: and a polymer containing amino and hydrophilic polyether groups is grafted on the modified epoxy resin.
8. The waterborne epoxy zinc rich primer of claim 1, wherein: the phenolic aldehyde amine epoxy curing agent is a cardanol modified amine curing agent and contains aliphatic amino, weakly acidic phenolic hydroxyl and a long chain containing double bond C15 on a benzene ring.
9. The waterborne epoxy zinc rich primer of claim 1, wherein: the modified amine epoxy curing agent is a Hensmei 38-1 type modified amine epoxy curing agent; the phenolic aldehyde amine epoxy curing agent is an NX-8101 type phenolic aldehyde amine epoxy curing agent of Cadelley.
10. The waterborne epoxy zinc rich primer of claim 1, wherein: the preparation method of the water-based epoxy zinc-rich primer comprises the following steps:
(1) premixing the modified epoxy resin, the dispersing agent and the film-forming additive for 10min under a low-speed stirring state, continuously adding the rheological additive, the defoaming agent, the adhesion promoter and the zinc powder protective agent, and stirring for 10min until the system is uniform;
then adding 500-mesh zinc powder into the mixture, and dispersing the mixture at a high speed for 30-40 min at a rotating speed of 1200-1500 rmp/min until the fineness is lower than 60 mu m; adding organic bentonite to adjust the viscosity of the system, and continuously dispersing for 10-15 min to obtain a component A;
(2) uniformly mixing the waterborne epoxy curing agent, pure water, the defoaming agent, the flash rust prevention agent and the thickening agent in a stirring state to obtain a mixture of the waterborne epoxy curing agent; adding the rheological additive into the mixture at the rotating speed of 500rmp/min, and uniformly dispersing for 10-15 min to obtain a component B;
(3) and uniformly mixing the component A and the component B according to the mass ratio of 3:1-4.5:1 to obtain the water-based epoxy zinc-rich primer.
CN202011585164.7A 2020-12-28 2020-12-28 Water-based epoxy zinc-rich primer and preparation method thereof Pending CN114686070A (en)

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CN115353795A (en) * 2022-09-05 2022-11-18 深圳职业技术学院 High-resistance water-based epoxy zinc-rich primer and preparation method thereof
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