CN112760005A - Environment-friendly solvent-free thick-coating high-adhesion cold-spraying zinc sealant and construction method thereof - Google Patents

Environment-friendly solvent-free thick-coating high-adhesion cold-spraying zinc sealant and construction method thereof Download PDF

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Publication number
CN112760005A
CN112760005A CN202011577086.6A CN202011577086A CN112760005A CN 112760005 A CN112760005 A CN 112760005A CN 202011577086 A CN202011577086 A CN 202011577086A CN 112760005 A CN112760005 A CN 112760005A
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parts
epoxy resin
agent
cold
sealant
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赵栋
张诗童
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Jiangsu Xin Neng Mstar Technology Ltd
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Jiangsu Xin Neng Mstar Technology Ltd
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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
    • C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
    • 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
    • C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
    • C08G59/4014—Nitrogen containing compounds
    • C08G59/4021—Ureas; Thioureas; Guanidines; Dicyandiamides
    • 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
    • C08G59/44—Amides
    • C08G59/46—Amides 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
    • C08G59/50—Amines
    • C08G59/56—Amines together with other curing agents
    • C08G59/60—Amines together with other curing agents with amides
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/64—Insulation or other protection; Elements or use of specified material therefor for making damp-proof; Protection against corrosion
    • E04B1/642—Protecting metallic construction elements against corrosion
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • 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
    • C08G2150/00—Compositions for coatings
    • C08G2150/90—Compositions for anticorrosive coatings
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • 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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  • Paints Or Removers (AREA)
  • Sealing Material Composition (AREA)

Abstract

The invention discloses an environment-friendly solvent-free thick-coating high-adhesion cold zinc spraying sealant, which comprises a base material, a curing agent for mixing and a quick curing agent: the base material at least comprises the following components in percentage by mass: epoxy resin: 45-55 parts of a modifier; pigment: 30-40 parts; active diluent: 4-8 parts; silicon-based polymerization agent: 5-10 parts; thixotropic agent: 1-2 parts; a toughening agent: 1-2 parts; defoaming agent: 0.5 to 1.5 portions; the curing agent for mixing at least comprises the following components in percentage by mass: modified polyamide: 80-90 parts of a stabilizer; silicon-based polymerization agent: 5-10 parts; the quick curing agent at least comprises the following components in percentage by mass: phenol: 20-30 parts; paraformaldehyde: 25-35 parts; diethylenetriamine: 30-40 parts; thiourea: 20-25 parts; accelerator (b): 1-2 parts; the fast curing effect of the fast curing agent on the epoxy resin and the penetration effect on the cold-sprayed zinc layer are utilized to realize the firm combination of the epoxy resin sealing layer and the cold-sprayed zinc layer and the compactness of the hierarchical curing, and the fast spraying is realized.

Description

Environment-friendly solvent-free thick-coating high-adhesion cold-spraying zinc sealant and construction method thereof
Technical Field
The invention relates to the technical field of cold spray zinc anticorrosion systems, in particular to an environment-friendly solvent-free thick-coating high-adhesion cold spray zinc sealant and a construction method thereof.
Background
The cold zinc spraying anticorrosion is a new steel structure anticorrosion technical system, an anticorrosion functional coating of the cold zinc spraying anticorrosion generally only contains less than 4 percent (mass fraction, the same below) of organic auxiliary agent, and the rest (more than 96 percent, even 99 percent) of high-purity zinc, so that the cold zinc spraying anticorrosion has three main advantages compared with the traditional epoxy zinc-rich sealing coating: firstly, the zinc content of the cold-spray zinc coating is far higher than that of the traditional epoxy zinc-rich sealing coating (50-80%), the protection effect per unit mass is higher, and the cold-spray zinc coating has a potential long-acting protection advantage especially in high-humidity and strong-corrosion application environments such as bridges and ports; secondly, the cold spray zinc coating contains less organic additives, is less prone to the problems of phase separation, brittle fracture caused by aging of the organic additives and the like, and meets the strategic requirements of sustainable development; and thirdly, the overall construction difficulty and the construction cost of the cold zinc spraying anticorrosion system are far less than those of the traditional epoxy zinc-rich anticorrosion system. Based on the advantages, the cold zinc spraying anticorrosion technology system is developed rapidly in recent years, successful application cases are increased rapidly, and the cold zinc spraying anticorrosion technology system must gradually replace the traditional epoxy zinc-rich anticorrosion technology and become a new mainstream.
The characteristic of high zinc content of cold spray zinc also puts higher requirements on the design and formulation of the seal coat. At present, the conventional technical means is to continue to use a mature epoxy resin primer system, but the protection effect is not good in practice, and the adhesion of the primer is further reduced and even the peeling of the paint skin is caused when the primer is applied and constructed on site in high-humidity areas such as bridges and ports, and the like, because the epoxy resin content of a layer to be protected exposed in the air is higher after the epoxy zinc-rich primer is constructed, the good adhesion effect can be obtained by directly constructing the normal epoxy resin sealing paint. However, the content of the organic auxiliary agent in the cold spray zinc coating is low, the protective layer can be regarded as a pure metal zinc layer, the intermolecular force between the cured protective layer and the epoxy resin is relatively weak, and if the traditional epoxy resin sealing paint is still applied, the problems of weak bonding, paint film falling and the like are inevitably caused. Based on the background, the adhesion force of the existing seal primer for cold zinc spraying is only determined to be more than or equal to 3MPa, and is far lower than the adhesion force standard (more than or equal to 5MPa, standard number) of the seal primer for epoxy zinc-rich coating, and although the requirement can be met in general occasions, the standard is still difficult to adapt to the practical requirement of long-acting protection in large-humidity occasions such as bridges, ports and the like. Therefore, there is a strong need and a practical significance to develop epoxy sealer primers with strong adhesion, especially in high humidity applications.
Disclosure of Invention
Aiming at the structural characteristics of the cold-sprayed zinc layer to be protected, the invention adopts a step-by-step coating method, utilizes the rapid curing effect of a rapid curing agent on epoxy resin and the permeation effect on the cold-sprayed zinc layer, realizes the firm combination of the epoxy resin sealing layer and the cold-sprayed zinc layer and the compactness of the hierarchical curing, and can realize the rapid spraying of a thicker sealing layer.
In order to achieve the above effects, the present invention provides the following technical solutions:
the environment-friendly solvent-free thick-coating high-adhesion cold-spraying zinc sealant,
comprises a base material, a curing agent for mixing and a quick curing agent:
the base material at least comprises the following components in percentage by mass:
epoxy resin: 45-55 parts of a modifier;
pigment: 30-40 parts;
active diluent: 4-8 parts;
silicon-based polymerization agent: 5-10 parts;
thixotropic agent: 1-2 parts;
a toughening agent: 1-2 parts;
defoaming agent: 0.5 to 1.5 portions;
the curing agent for mixing at least comprises the following components in percentage by mass:
modified polyamide: 80-90 parts of a stabilizer;
silicon-based polymerization agent: 5-10 parts;
the quick curing agent at least comprises the following components in percentage by mass:
phenol: 20-30 parts;
paraformaldehyde: 25-35 parts;
diethylenetriamine: 30-40 parts;
thiourea: 20-25 parts;
accelerator (b): 1 to 2 portions.
Preferably, the epoxy resin is a mixture of a high molecular weight and a low molecular weight, and the mixing ratio is 1: 2-2: 1.
Preferably, the pigment is one of titanium dioxide and talcum powder or a mixture of the titanium dioxide and the talcum powder.
Preferably, the thixotropic agent is hydrogenated castor oil, organobentonite, fumed silica or a polyamide wax.
Preferably, the toughening agent is polypropylene glycol glycidyl ether.
Preferably, the defoaming agent is a mixture obtained by mixing BYK-359, BYK-356 and BYK-354 according to a certain proportion.
Preferably, the promoter is DMP-30.
Preferably, the epoxy resin is a mixture obtained by mixing one or more of 607 epoxy resin, 604 epoxy resin, 601 epoxy resin, E51 epoxy resin, 828 epoxy resin and 128 epoxy resin with SHB liquid epoxy resin according to a certain proportion.
The construction method of the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is characterized in that the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is adopted, a base material and a curing agent for mixing are mixed into a mixture on site, a rapid curing agent is sprayed on the surface of a cold-spray zinc coating to be sealed at high pressure, and then the mixture and the rapid curing agent are sprayed rapidly, continuously and uniformly in sequence.
Preferably, the single spraying thickness of the rapid curing agent is 50-100 mm, and the single spraying thickness of the mixture is 0.5-1 mm.
The invention provides an environment-friendly solvent-free thick-coating high-adhesion cold zinc spraying sealant and a construction method thereof, and the sealant has the following beneficial effects:
1. the formula of the rapid curing agent has the capability of rapidly curing epoxy resin, the rapid curing agent is firstly sprayed in a high-pressure spraying mode, can permeate into a cold-sprayed zinc layer, has enough viscosity, is rapidly cured along with the rapid curing agent when the mixture is contacted with the rapid curing agent after a base material and a mixture of the curing agent for mixing are sprayed, has the same curing range and continuously permeates into the cold-sprayed zinc layer along with the rapid curing agent, and realizes rapid curing in an internal gap of the cold-sprayed zinc layer, so that a network structure is formed in the gap of the cold-sprayed zinc layer, and the binding force of a sealing layer and the cold-sprayed zinc layer is greatly improved; meanwhile, the curing speed of the rapid curing agent is higher than that of the curing agent in the mixture, and the curing agent expands outwards in a layered mode from one side close to the cold spray zinc layer along with the permeation of the rapid curing agent to the mixture, so that on one hand, the compactness of the inner part of the sealing layer is promoted, and meanwhile, the rapid curing agent and the mixture are sprayed alternately to form the possibility of spraying the thick sealing layer quickly, and the defect that the epoxy resin sealing layer is long when being used for spraying the thick epoxy resin sealing layer is avoided.
2. The epoxy seal primer disclosed by the invention can be used for directly sealing cold spray zinc anticorrosive coatings, has strong adhesive force besides the conventional chemical corrosion resistance, can effectively overcome the problems of peeling, brittle fracture and the like of the conventional epoxy seal primer, and is particularly suitable for field construction of bridges, ports and the like in high-humidity environments. Besides, the epoxy seal primer disclosed by the invention is also suitable for sealing in other occasions, such as concrete and the like, besides the cold zinc spray anticorrosive paint.
3. The invention is easy to construct, strong in adhesive force and easy to repair during construction; the paint is resistant to immersion of seawater, acid and alkali, and has good physical properties, impact resistance and friction resistance; the paint can be quickly cured and can be constructed on a field structure on a low tide waterline; has long service life without maintenance.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
The environment-friendly solvent-free thick-coating high-adhesion cold-spraying zinc sealant,
comprises a base material, a curing agent for mixing and a quick curing agent:
the base material at least comprises the following components in percentage by mass:
epoxy resin: 45-55 parts of a modifier;
pigment: 30-40 parts;
active diluent: 4-8 parts;
silicon-based polymerization agent: 5-10 parts;
thixotropic agent: 1-2 parts;
a toughening agent: 1-2 parts;
defoaming agent: 0.5 to 1.5 portions;
the curing agent for mixing at least comprises the following components in percentage by mass:
modified polyamide: 80-90 parts of a stabilizer;
silicon-based polymerization agent: 5-10 parts;
the quick curing agent at least comprises the following components in percentage by mass:
phenol: 20-30 parts;
paraformaldehyde: 25-35 parts;
diethylenetriamine: 30-40 parts;
thiourea: 20-25 parts;
accelerator (b): 1 to 2 portions.
Furthermore, the epoxy resin is a mixture of a high molecular weight and a low molecular weight, and the mixing ratio is 1: 2-2: 1.
Further, the pigment is one of titanium dioxide and talcum powder or a mixture of the titanium dioxide and the talcum powder.
Further, the thixotropic agent is hydrogenated castor oil, organic bentonite, fumed silica or polyamide wax.
Further, the toughening agent is polypropylene glycol glycidyl ether.
Further, the defoaming agent is a mixture obtained by mixing BYK-359, BYK-356 and BYK-354 according to a certain proportion.
Further, the accelerant is DMP-30.
Further, the epoxy resin is a mixture obtained by mixing one or more of 607 epoxy resin, 604 epoxy resin, 601 epoxy resin, E51 epoxy resin, 828 epoxy resin and 128 epoxy resin with SHB liquid epoxy resin according to a certain proportion.
The construction method of the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is characterized in that the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is adopted, a base material and a curing agent for mixing are mixed into a mixture on site, a rapid curing agent is sprayed on the surface of a cold-spray zinc coating to be sealed at high pressure, and then the mixture and the rapid curing agent are sprayed rapidly, continuously and uniformly in sequence.
Further, the single spraying thickness of the rapid curing agent is 50-100 mm, and the single spraying thickness of the mixture is 0.5-1 mm.
Specific examples within the above composition ranges are as follows:
example 1:
the base material at least comprises the following components in percentage by mass:
epoxy resin: 45 parts of (1);
pigment: 40 parts of a mixture;
active diluent: 8 parts of a mixture;
silicon-based polymerization agent: 10 parts of (A);
thixotropic agent: 2 parts of (1);
a toughening agent: 2 parts of (1);
defoaming agent: 1.5 parts;
the curing agent for mixing at least comprises the following components in percentage by mass:
modified polyamide: 80 parts of a mixture;
silicon-based polymerization agent: 10 parts of (A);
the quick curing agent at least comprises the following components in percentage by mass:
phenol: 20 parts of (1);
paraformaldehyde: 35 parts of (B);
diethylenetriamine: 30 parts of (1);
thiourea: 25 parts of (1);
accelerator (b): and 2 parts.
The epoxy resin is a mixture of high molecular weight and low molecular weight, and the mixing ratio is 1:2, wherein the high molecular weight epoxy resin is 607 epoxy resin, 604 epoxy resin and 601 epoxy resin according to the proportion of 1: 2: 2 mixing with SHB liquid epoxy resin.
The pigment is a mixture of titanium dioxide and talcum powder.
The thixotropic agent is hydrogenated castor oil.
The toughening agent is polypropylene glycol glycidyl ether.
The defoaming agent is BYK-359, BYK-356 and BYK-354, and the ratio is 1: 1: the resulting mixture was mixed at a ratio of 2.
The promoter is DMP-30.
The construction method of the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is characterized in that the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is adopted, a base material and a curing agent for mixing are mixed into a mixture on site, a rapid curing agent is sprayed on the surface of a cold-spray zinc coating to be sealed at high pressure, and then the mixture and the rapid curing agent are sprayed rapidly, continuously and uniformly in sequence.
The single spraying thickness of the rapid curing agent is 50mm, and the single spraying thickness of the mixture is 0.5 mm.
Example 2:
the base material at least comprises the following components in percentage by mass:
epoxy resin: 55 parts of (1);
pigment: 30 parts of (1);
active diluent: 4 parts of a mixture;
silicon-based polymerization agent: 5 parts of a mixture;
thixotropic agent: 1 part;
a toughening agent: 1 part;
defoaming agent: 0.5 part;
the curing agent for mixing at least comprises the following components in percentage by mass:
modified polyamide: 90 parts of a mixture;
silicon-based polymerization agent: 5 parts of a mixture;
the quick curing agent at least comprises the following components in percentage by mass:
phenol: 30 parts of (1);
paraformaldehyde: 25 parts of (1);
diethylenetriamine: 40 parts of a mixture;
thiourea: 20 parts of (1);
accelerator (b): 1 part.
The epoxy resin is a mixture of high molecular weight and low molecular weight, and the mixing ratio is 2:1, wherein the high molecular weight epoxy resin is E51 epoxy resin, 828 epoxy resin and 128 epoxy resin, and the weight ratio of the epoxy resin to the epoxy resin is 2: 1:1 part by weight of the mixture was mixed with SHB liquid epoxy resin.
The pigment is titanium dioxide.
The thixotropic agent is organic bentonite and fumed silica, and the weight ratio of the thixotropic agent to the thixotropic agent is 1:2, mixing the components.
The toughening agent is polypropylene glycol glycidyl ether.
The defoaming agent is BYK-356 and BYK-354 according to the proportion of 1: the resulting mixture was mixed at a ratio of 1.
The promoter is DMP-30.
The construction method of the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is characterized in that the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is adopted, a base material and a curing agent for mixing are mixed into a mixture on site, a rapid curing agent is sprayed on the surface of a cold-spray zinc coating to be sealed at high pressure, and then the mixture and the rapid curing agent are sprayed rapidly, continuously and uniformly in sequence.
Further, the single spraying thickness of the rapid curing agent is 100mm, and the single spraying thickness of the mixture is 1 mm.
Example 3:
the base material at least comprises the following components in percentage by mass:
epoxy resin: 50 parts of a mixture;
pigment: 35 parts of (B);
active diluent: 6 parts of (1);
silicon-based polymerization agent: 7 parts;
thixotropic agent: 1.5 parts;
a toughening agent: 1.5 parts;
defoaming agent: 1.2 parts;
the curing agent for mixing at least comprises the following components in percentage by mass:
modified polyamide: 85 parts of a mixture;
silicon-based polymerization agent: 7 parts;
the quick curing agent at least comprises the following components in percentage by mass:
phenol: 25 parts of (1);
paraformaldehyde: 30 parts of (1);
diethylenetriamine: 35 parts of (B);
thiourea: 22 parts of (A);
accelerator (b): 1.5 parts.
The epoxy resin is a mixture of high molecular weight and low molecular weight, and the mixing ratio is 1:1, wherein the high molecular two epoxy resins are 607 epoxy resin, 828 epoxy resin and 128 epoxy resin according to the ratio of 1: 2:1 ratio and mixing with SHB liquid epoxy resin.
The pigment is talcum powder.
The thixotropic agent is a polyamide wax.
The toughening agent is polypropylene glycol glycidyl ether.
The defoaming agent is BYK-359, BYK-356 and BYK-354 according to the proportion of 1: 1: the resulting mixture was mixed at a ratio of 1.
The promoter is DMP-30.
The construction method of the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is characterized in that the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is adopted, a base material and a curing agent for mixing are mixed into a mixture on site, a rapid curing agent is sprayed on the surface of a cold-spray zinc coating to be sealed at high pressure, and then the mixture and the rapid curing agent are sprayed rapidly, continuously and uniformly in sequence.
The single spraying thickness of the rapid curing agent is 80 mm, and the single spraying thickness of the mixture is 0.8 mm.
The cold zinc spraying anticorrosion system constructed by the 3 embodiments is compared with a cold zinc spraying coating sold by a certain tap enterprise purchased in the market in a laboratory for performance test, and the test contents are as follows:
1. mechanical testing
The test substrate is Q235 steel with the size of 200mm multiplied by 100mm multiplied by 2mm, the surface of the steel plate reaches Sa2.5 grade (ISO8501-1) through sand blasting treatment, and then the steel plate is cleaned by absolute ethyl alcohol, surface impurities are removed, and the steel plate is dried for standby.
Firstly, cold spray zinc spraying is carried out, then the seal primers prepared according to the formula of the 3 examples are respectively sprayed on the cold spray zinc layer, and the flexibility, the impact resistance, the adhesive force and the grid marking method are respectively tested together with a control sample.
Figure BDA0002864606260000111
Figure BDA0002864606260000121
The flexibility and impact resistance of examples 1 to 3 did not have a significant advantage over the control, but there was a significant improvement in adhesion.
2. Salt spray test
The test substrate is Q235 steel with the size of 200mm multiplied by 100mm multiplied by 2mm, the surface of the steel plate reaches Sa2.5 grade (ISO8501-1) through sand blasting treatment, and then the steel plate is cleaned by absolute ethyl alcohol, surface impurities are removed, and the steel plate is dried for standby.
First, cold zinc spray coating was performed, and then the seal primers formulated according to the formulations of the above 3 examples were respectively sprayed on the cold zinc spray coating to scratch a scratch exposing the substrate at the middle position of the coating surface, the scratch having a size of 150mm × 1mm, and four pieces of each test sample, three pieces of which were used for the test, were prepared for one reference along with the control samples. The corrosion and the blistering phenomenon of the scratches on the surface of the coating are regularly observed and regularly recorded by a digital camera, and the results after 2000h salt spray test are summarized as follows:
Figure BDA0002864606260000122
although the cross section of the control sample is still flat, the phenomenon of incompact is found through microscopic observation, bubbles are found to be generated, gaps with different lengths are found, and in addition, the EDS energy spectrum element finds Fe, so that iron corrosion products appear in the coating, the base material is partially corroded, the corrosion protection performance of the coating disappears, and the examples 1 to 3 have no obvious corrosion phenomenon.
3. Electrochemical testing
Electrochemical impedance spectroscopy measurement of the coating layer adopts Q235 steel as a base material, the size is 10mm multiplied by 3mm,
and (3) polishing the surface by using 400# SiC sand paper, cleaning by using absolute ethyl alcohol, removing impurities on the surface, and airing for later use. Firstly, cold zinc spraying is carried out, then the seal primers prepared according to the formula of the 3 examples are respectively sprayed on the cold zinc spraying layer, the other group of the test samples are sprayed, the electrochemical impedance measurement frequency is 10-10 Hz, the disturbance voltage is 20mV, the test solution is 3.5 wt% NaCl solution, and the test temperature is room temperature. To prevent interference from external signals, the measurement of electrochemical impedance spectra was performed in a faraday electromagnetic shield.
The test structure is summarized as follows:
impedance module value fall time (h) Cathodic protection time (h)
Example 1 3500 2700
Example 2 3400 2500
Example 3 3500 2600
Control sample 2600 1700
The shielding and cathodic protection of examples 1 to 3 are significantly longer lasting than the control.
From the above, the mechanical property, the corrosion resistance and the electrochemical property of the cold spray zinc corrosion prevention system can be obviously improved by adopting the formula and the construction method. Can produce remarkable benefits in actual construction.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant is characterized in that:
comprises a base material, a curing agent for mixing and a quick curing agent:
the base material at least comprises the following components in percentage by mass:
epoxy resin: 45-55 parts of a modifier;
pigment: 30-40 parts;
active diluent: 4-8 parts;
silicon-based polymerization agent: 5-10 parts;
thixotropic agent: 1-2 parts;
a toughening agent: 1-2 parts;
defoaming agent: 0.5 to 1.5 portions;
the curing agent for mixing at least comprises the following components in percentage by mass:
modified polyamide: 80-90 parts of a stabilizer;
silicon-based polymerization agent: 5-10 parts;
the quick curing agent at least comprises the following components in percentage by mass:
phenol: 20-30 parts;
paraformaldehyde: 25-35 parts;
diethylenetriamine: 30-40 parts;
thiourea: 20-25 parts;
accelerator (b): 1 to 2 portions.
2. The environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant as claimed in claim 1, wherein:
the epoxy resin is a mixture of high molecular weight and low molecular weight, and the mixing ratio is 1: 2-2: 1.
3. The environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant as claimed in claim 1, wherein:
the pigment is one of titanium dioxide and talcum powder or a mixture of the titanium dioxide and the talcum powder.
4. The environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant as claimed in claim 1, wherein:
the thixotropic agent is hydrogenated castor oil, organic bentonite, fumed silica or polyamide wax.
5. The environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant as claimed in claim 1, wherein:
the toughening agent is polypropylene glycol glycidyl ether.
6. The environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant as claimed in claim 1, wherein:
the defoaming agent is a mixture obtained by mixing BYK-359, BYK-356 and BYK-354 according to a certain proportion.
7. The environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant as claimed in claim 1, wherein:
the accelerant is DMP-30.
8. The environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant as claimed in claim 2, wherein:
the epoxy resin is a mixture obtained by mixing one or more of 607 epoxy resin, 604 epoxy resin, 601 epoxy resin, E51 epoxy resin, 828 epoxy resin and 128 epoxy resin with SHB liquid epoxy resin according to a certain proportion.
9. The construction method of the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant adopts the environment-friendly solvent-free thick-coating high-adhesion cold-spray zinc sealant as claimed in any one of claims 1 to 8, and is characterized in that:
mixing the base material and the curing agent for mixing to form a mixture on site, spraying the rapid curing agent on the surface of the cold-sprayed zinc coating to be sealed at high pressure, and then quickly, continuously and uniformly spraying the mixture and the rapid curing agent in sequence.
10. The construction method of the environment-friendly solvent-free thick-coating high-adhesion cold zinc spraying sealant as claimed in claim 9, characterized in that:
the single spraying thickness of the rapid curing agent is 50-100 mm, and the single spraying thickness of the mixture is 0.5-1 mm.
CN202011577086.6A 2020-12-28 2020-12-28 Environment-friendly solvent-free thick-coating high-adhesion cold-spraying zinc sealant and construction method thereof Pending CN112760005A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109107858A (en) * 2018-08-31 2019-01-01 广东工业大学 A kind of curing method of coating
CN110157293A (en) * 2019-05-07 2019-08-23 河南城建学院 A kind of solvent-free epoxy heavy-duty anticorrosive coating and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109107858A (en) * 2018-08-31 2019-01-01 广东工业大学 A kind of curing method of coating
CN110157293A (en) * 2019-05-07 2019-08-23 河南城建学院 A kind of solvent-free epoxy heavy-duty anticorrosive coating and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
聂锡铭等: "环氧树脂低温快速固化剂的合成及性能研究", 《工程塑料应用》 *

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