CN112724778A - Thick-coating quick-drying cold zinc-spraying sealing agent and construction method thereof - Google Patents
Thick-coating quick-drying cold zinc-spraying sealing agent and construction method thereof Download PDFInfo
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- CN112724778A CN112724778A CN202011577087.0A CN202011577087A CN112724778A CN 112724778 A CN112724778 A CN 112724778A CN 202011577087 A CN202011577087 A CN 202011577087A CN 112724778 A CN112724778 A CN 112724778A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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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
- 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
- C09D7/65—Additives macromolecular
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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
- 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
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- 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
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- 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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Abstract
The invention discloses a thick coating quick-drying cold zinc spraying sealant, which comprises an agent A and an agent B; the agent A 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 agent B at least comprises the following components in percentage by mass: epoxy resin: 30-50 parts; solvent: 30-60 parts; cosolvent: 0.5 to 2 parts; colorant: 1-2 parts; defoaming agent: 0.5 to 1.5 portions; curing agent: 20-50 parts of a solvent; supramolecular auxiliaries: 0.1 to 1 portion; the invention adopts a step-by-step coating method, utilizes the rapid curing effect of the agent A on the epoxy resin and the penetration 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 the thicker sealing layer.
Description
Technical Field
The invention relates to the technical field of cold zinc spraying anticorrosion systems, in particular to a thick-coating quick-drying cold zinc spraying 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, however, 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 high after the epoxy zinc-rich primer is constructed, and 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 national standard of the adhesion of the seal primer for cold zinc spraying is only greater than or equal to 3MPa, which is far lower than the adhesion standard (greater 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-term 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 the agent A on the epoxy resin and the penetration 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 the thicker sealing layer.
In order to achieve the above effects, the present invention provides the following technical solutions:
a thick-coating quick-drying cold zinc-spraying sealing agent,
comprises an agent A and an agent B;
the agent A 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 agent B at least comprises the following components in percentage by mass:
epoxy resin: 30-50 parts;
solvent: 30-60 parts;
a toughening agent: 10-20 parts;
thixotropic agent: 10-20 parts;
cosolvent: 0.5 to 2 parts;
colorant: 1-2 parts;
defoaming agent: 0.5 to 1.5 portions;
curing agent: 20-50 parts of a solvent;
supramolecular auxiliaries: 0.1 to 1 portion.
Preferably, the accelerator is DMP-30; 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 according to a certain proportion.
Preferably, the solvent in the agent B is a mixture obtained by mixing one or more of dimethylbenzene, n-butanol and ethylbenzene according to a certain proportion; the thixotropic agent is hydrogenated castor oil, organic bentonite, fumed silica or polyamide wax.
Preferably, the cosolvent is an organic silane coupling agent; 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 curing agent in the agent B is one or a mixture of more of NX2018, NX2016 and NX 2015.
Preferably, the colorant is titanium dioxide.
Preferably, the supramolecular auxiliary agent is one or a mixture of polyvinyl alcohol and polyvinyl formal.
The construction method of the thick coating quick drying type cold spray zinc sealing agent adopts the thick coating quick drying type cold spray zinc sealing agent as claimed in any one of claims 1 to 8, the agent A is sprayed on the surface of the cold spray zinc coating to be sealed under high pressure, and then the agent B is sprayed uniformly and quickly.
Preferably, the spraying thickness of the agent A is 50-100 mm, and the spraying thickness of the agent B is 2-3 mm.
The invention provides a thick-coating quick-drying cold zinc spraying sealant and a construction method thereof, and the thick-coating quick-drying cold zinc spraying sealant has the following beneficial effects:
1. the formula of the agent A has the capability of quickly curing epoxy resin, the agent A is firstly sprayed in a high-pressure spraying mode, can permeate into a cold-sprayed zinc layer and has enough viscosity, after the agent B is sprayed, the agent B is quickly cured along with the agent A when being contacted with the agent A, the curing range of the agent B is also continuously permeated into the cold-sprayed zinc layer along with the agent A, and the quick curing is realized 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 bonding force of a sealing layer and the cold-sprayed zinc layer is greatly improved; meanwhile, the curing speed of the agent A is higher than that of the curing agent in the agent B, and the curing agent expands outwards in a layered manner from one side close to the cold zinc spraying layer along with the permeation of the agent A to the agent B, so that the compactness of the inside of the sealing layer is promoted, the outward gas discharge is facilitated, the possibility of quickly spraying a thick sealing layer is realized, and the defect of long time when the thick epoxy resin sealing layer is sprayed is overcome.
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 a high-humidity environment. 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.
A thick-coating quick-drying cold zinc-spraying sealing agent,
comprises an agent A and an agent B;
the agent A 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 agent B at least comprises the following components in percentage by mass:
epoxy resin: 30-50 parts;
solvent: 30-60 parts;
a toughening agent: 10-20 parts;
thixotropic agent: 10-20 parts;
cosolvent: 0.5 to 2 parts;
colorant: 1-2 parts;
defoaming agent: 0.5 to 1.5 portions;
curing agent: 20-50 parts of a solvent;
supramolecular auxiliaries: 0.1 to 1 portion.
Further, the accelerant is DMP-30; 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 according to a certain proportion.
Further, the solvent in the agent B is a mixture obtained by mixing one or more of dimethylbenzene, n-butanol and ethylbenzene according to a certain proportion; the thixotropic agent is hydrogenated castor oil, organic bentonite, fumed silica or polyamide wax.
Further, the cosolvent is an organic silane coupling agent; 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 curing agent in the agent B is one or a mixture of more of NX2018, NX2016 and NX 2015.
Further, the colorant is titanium dioxide.
Furthermore, the supramolecular auxiliary agent is one or a mixture of polyvinyl alcohol and polyvinyl formal.
The construction method of the thick coating quick drying type cold spray zinc sealing agent is characterized in that the thick coating quick drying type cold spray zinc sealing agent is adopted, the agent A is sprayed on the surface of a cold spray zinc coating to be sealed under high pressure, and then the agent B is sprayed uniformly and quickly.
Further, the spraying thickness of the agent A is 50-100 mm, and the spraying thickness of the agent B is 2-3 mm.
Specific examples within the above composition ranges are as follows:
example 1:
the agent A comprises the following components in percentage by mass:
phenol: 20 parts of (1);
paraformaldehyde: 35 parts of (B);
diethylenetriamine: 40 parts of a mixture;
thiourea: 20 parts of (1);
accelerator (b): 1 part;
the agent B at least comprises the following components in percentage by mass:
epoxy resin: 30 parts of (1);
solvent: 30 parts of (1);
a toughening agent: 10 parts of (A);
thixotropic agent: 10 parts of (A);
cosolvent: 2 parts of (1);
colorant: 2 parts of (1);
defoaming agent: 1.5 parts;
curing agent: 50 parts of a mixture;
supramolecular auxiliaries: 1 part.
The formula comprises the following components:
the accelerant is DMP-30; the epoxy resin is a mixture of 607 epoxy resin, 604 epoxy resin and 601 epoxy resin mixed in a ratio of 1:2: 3.
The solvent in the agent B is a mixture obtained by mixing dimethylbenzene, n-butanol and ethylbenzene according to the ratio of 3:4: 1;
the thixotropic agent is hydrogenated castor oil.
The cosolvent is vinyl triethoxysilane.
The toughening agent is polypropylene glycol glycidyl ether.
The defoaming agent is a mixture obtained by mixing BYK-359, BYK-356 and BYK-354 according to the ratio of 2:2: 1.
The curing agent in the agent B is a mixture obtained by mixing NX2018 and NX2016 in a ratio of 1: 2.
The colorant is titanium dioxide.
The supermolecule assistant is polyvinyl alcohol.
The agent A is prepared and subpackaged for production, the agent B is prepared on site, the agent A is sprayed on the surface of the cold-sprayed zinc coating to be sealed at high pressure, and then the agent B is sprayed rapidly and continuously and uniformly.
The spraying thickness of the agent A is 50 micrometers, and the spraying thickness of the agent B is 2 millimeters.
Example 2:
a thick-coating quick-drying cold zinc-spraying sealing agent,
comprises an agent A and an agent B;
the agent A 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): 2 parts of (1);
the agent B at least comprises the following components in percentage by mass:
epoxy resin: 50 parts of a mixture;
solvent: 60 parts;
a toughening agent: 20 parts of (1);
thixotropic agent: 20 parts of (1);
cosolvent: 0.5 part;
colorant: 1 part;
defoaming agent: 0.5 part;
curing agent: 20 parts of (1);
supramolecular auxiliaries: 0.1 part.
The formula comprises the following components:
the accelerant is DMP-30; the epoxy resin is a mixture of 607 epoxy resin, 604 epoxy resin and 601 epoxy resin mixed in a ratio of 1:2: 3.
The solvent in the agent B is a mixture obtained by mixing dimethylbenzene, n-butanol and ethylbenzene according to the ratio of 3:4: 1.
The thixotropic agent is hydrogenated castor oil.
The cosolvent is vinyl triethoxysilane.
The toughening agent is polypropylene glycol glycidyl ether.
The defoaming agent is a mixture obtained by mixing BYK-359, BYK-356 and BYK-354 according to the ratio of 2:2: 1.
The curing agent in the agent B is a mixture obtained by mixing NX2018 and NX2016 in a ratio of 1: 2.
The colorant is titanium dioxide.
The supermolecule assistant is polyvinyl alcohol.
The agent A is prepared and subpackaged for production, the agent B is prepared on site, the agent A is sprayed on the surface of the cold-sprayed zinc coating to be sealed at high pressure, and then the agent B is sprayed rapidly and continuously and uniformly.
The spraying thickness of the agent A is 100 micrometers, and the spraying thickness of the agent B is 3 millimeters.
Example 3:
a thick-coating quick-drying cold zinc-spraying sealing agent,
comprises an agent A and an agent B;
the agent A 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 agent B at least comprises the following components in percentage by mass:
epoxy resin: 40 parts of a mixture;
solvent: 45 parts of (1);
a toughening agent: 15 parts of (1);
thixotropic agent: 15 parts of (1);
cosolvent: 1.5 parts;
colorant: 1.5 parts;
defoaming agent: 1 part;
curing agent: 40 parts of a mixture;
supramolecular auxiliaries: 0.7 part.
The formula comprises the following components:
the accelerant is DMP-30; the epoxy resin is a mixture of 607 epoxy resin, 604 epoxy resin and 601 epoxy resin mixed in a ratio of 1:2: 3.
The solvent in the agent B is a mixture obtained by mixing dimethylbenzene, n-butanol and ethylbenzene according to the ratio of 3:4: 1.
The thixotropic agent is hydrogenated castor oil.
The cosolvent is vinyl triethoxysilane.
The toughening agent is polypropylene glycol glycidyl ether.
The defoaming agent is a mixture obtained by mixing BYK-359, BYK-356 and BYK-354 according to the ratio of 2:2: 1.
The curing agent in the agent B is a mixture obtained by mixing NX2018 and NX2016 in a ratio of 1: 2.
The colorant is titanium dioxide.
The supermolecule assistant is polyvinyl alcohol.
The agent A is prepared and subpackaged for production, the agent B is prepared on site, the agent A is sprayed on the surface of the cold-sprayed zinc coating to be sealed at high pressure, and then the agent B is sprayed rapidly and continuously and uniformly.
The spraying thickness of the agent A is 80 micrometers, and the spraying thickness of the agent B is 3 millimeters.
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 (I SO8501-1) 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.
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 a seal primer formulated according to the formulation of the above 3 examples was sprayed on the cold zinc spray coating, respectively, to scratch a scratch exposing the substrate at the middle position of the coating surface, the size of the scratch being 150mm × 1mm, and four pieces of each test sample, three pieces of which were used as a reference, were prepared for the test, together 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:
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:
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 thick coating quick-drying cold zinc spraying sealant is characterized in that:
comprises an agent A and an agent B;
the agent A 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 agent B at least comprises the following components in percentage by mass:
epoxy resin: 30-50 parts;
solvent: 30-60 parts;
a toughening agent: 10-20 parts;
thixotropic agent: 10-20 parts;
cosolvent: 0.5 to 2 parts;
colorant: 1-2 parts;
defoaming agent: 0.5 to 1.5 portions;
curing agent: 20-50 parts of a solvent;
supramolecular auxiliaries: 0.1 to 1 portion.
2. The thick-coat, quick-drying, cold-spray zinc sealant of claim 1, wherein:
the accelerant is DMP-30; 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 according to a certain proportion.
3. The thick-coat, quick-drying, cold-spray zinc sealant of claim 1, wherein:
the solvent in the agent B is a mixture obtained by mixing one or more of dimethylbenzene, n-butyl alcohol and ethylbenzene according to a certain proportion; the thixotropic agent is hydrogenated castor oil, organic bentonite, fumed silica or polyamide wax.
4. The thick-coat, quick-drying, cold-spray zinc sealant of claim 1, wherein: the cosolvent is an organic silane coupling agent; the toughening agent is polypropylene glycol glycidyl ether.
5. The thick-coat, quick-drying, cold-spray zinc sealant of claim 1, wherein:
the defoaming agent is a mixture obtained by mixing BYK-359, BYK-356 and BYK-354 according to a certain proportion.
6. The thick-coat, quick-drying, cold-spray zinc sealant of claim 1, wherein:
the curing agent in the agent B is one or a mixture of more of NX2018, NX2016 and NX 2015.
7. The thick-coat, quick-drying, cold-spray zinc sealant of claim 1, wherein:
the colorant is titanium dioxide.
8. The thick-coat, quick-drying, cold-spray zinc sealant of claim 1, wherein:
the supermolecule auxiliary agent is one or a mixture of polyvinyl alcohol and polyvinyl formal.
9. The construction method of the thick coating quick drying type cold spray zinc sealing agent adopts the thick coating quick drying type cold spray zinc sealing agent as claimed in any one of claims 1 to 8, and is characterized in that:
spraying the agent A on the surface of the cold-sprayed zinc coating to be sealed at high pressure, and then quickly and continuously spraying the agent B uniformly.
10. The method of claim 9, wherein the method comprises the following steps:
the spraying thickness of the agent A is 50-100 mm, and the spraying thickness of the agent B is 2-3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011577087.0A CN112724778A (en) | 2020-12-28 | 2020-12-28 | Thick-coating quick-drying cold zinc-spraying sealing agent and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011577087.0A CN112724778A (en) | 2020-12-28 | 2020-12-28 | Thick-coating quick-drying cold zinc-spraying sealing agent and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112724778A true CN112724778A (en) | 2021-04-30 |
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Citations (5)
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|---|---|---|---|---|
| WO1999050328A1 (en) * | 1998-03-25 | 1999-10-07 | The Yokohama Rubber Co., Ltd. | One-pack type moisture-curable composition |
| CN1887992A (en) * | 2006-07-19 | 2007-01-03 | 江苏中矿大正表面工程技术有限公司 | Nanometer modified epoxy sealing paint and its prepn |
| WO2009155115A2 (en) * | 2008-05-30 | 2009-12-23 | Reactive Surfaces, Ltd. | Coatings and surface treatments having active enzymes and peptides |
| CN105017935A (en) * | 2015-08-05 | 2015-11-04 | 无锡华东锌盾科技有限公司 | Epoxy micaceous iron sealing agent for cold sprayed zinc and preparation method of epoxy micaceous iron sealing agent |
| CN108865028A (en) * | 2018-05-25 | 2018-11-23 | 邹峰 | A kind of preparation method of low temperature resistant expediting setting type dry-hang glue |
-
2020
- 2020-12-28 CN CN202011577087.0A patent/CN112724778A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999050328A1 (en) * | 1998-03-25 | 1999-10-07 | The Yokohama Rubber Co., Ltd. | One-pack type moisture-curable composition |
| CN1887992A (en) * | 2006-07-19 | 2007-01-03 | 江苏中矿大正表面工程技术有限公司 | Nanometer modified epoxy sealing paint and its prepn |
| WO2009155115A2 (en) * | 2008-05-30 | 2009-12-23 | Reactive Surfaces, Ltd. | Coatings and surface treatments having active enzymes and peptides |
| CN105017935A (en) * | 2015-08-05 | 2015-11-04 | 无锡华东锌盾科技有限公司 | Epoxy micaceous iron sealing agent for cold sprayed zinc and preparation method of epoxy micaceous iron sealing agent |
| CN108865028A (en) * | 2018-05-25 | 2018-11-23 | 邹峰 | A kind of preparation method of low temperature resistant expediting setting type dry-hang glue |
Non-Patent Citations (1)
| 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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Application publication date: 20210430 |