CN112760004A - Environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant and construction method thereof - Google Patents
Environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant and construction method thereof Download PDFInfo
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- CN112760004A CN112760004A CN202011577072.4A CN202011577072A CN112760004A CN 112760004 A CN112760004 A CN 112760004A CN 202011577072 A CN202011577072 A CN 202011577072A CN 112760004 A CN112760004 A CN 112760004A
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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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
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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
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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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
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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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- 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
- B05D2503/00—Polyurethanes
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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
- B05D2504/00—Epoxy polymers
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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
- B05D2505/00—Polyamides
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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
- B05D2518/00—Other type of polymers
- B05D2518/10—Silicon-containing polymers
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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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- 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
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- 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 an environment-friendly hydrophobic moisture-resistant cold-spray zinc sealant, which comprises a base material, a curing agent for mixing, a polyurethane foaming material and a hydrophobic material: 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 polyurethane foaming material at least comprises the following components in percentage by mass: oligomer polyol: 45-60 parts; 25-35 parts of isocyanate; chain extension crosslinking agent: 0.5 to 1 portion; foaming agent: 2-5 parts; by adopting a step-by-step coating method, epoxy resin-based spray paint is used as a sealing agent, polyurethane foaming material is sprayed again, and finally graphene is sprayed, so that the sealing layer formed overall has hydrophobic and moisture-proof performances.
Description
Technical Field
The invention relates to the technical field of cold spray zinc anticorrosion systems, in particular to an environment-friendly hydrophobic moisture-resistant 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, 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 a cold-sprayed zinc layer to be protected, the invention adopts a step-by-step coating method, uses epoxy resin-based spray paint as a sealing agent, sprays polyurethane foaming material again, and finally sprays graphene, so that the totally formed sealing layer has hydrophobic and moisture-proof performances.
In order to achieve the above effects, the present invention provides the following technical solutions:
an environment-friendly hydrophobic moisture-resistant cold-spray zinc sealant,
comprises a base material, a curing agent for mixing, a polyurethane foaming material and a hydrophobic material:
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 polyurethane foaming material at least comprises the following components in percentage by mass:
oligomer polyol: 45-60 parts;
25-35 parts of isocyanate;
chain extension crosslinking agent: 0.5 to 1 portion;
foaming agent: 2-5 parts;
foam stabilizer: 0.5 to 1 portion;
catalyst: 0.5 to 1 portion;
1-2 parts of a pore forming agent.
Preferably, the hydrophobic material is graphene.
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.
Preferably, the thixotropic agent is hydrogenated castor oil, organobentonite, fumed silica or polyamide wax; the pigment is one of titanium dioxide and talcum powder or a mixture of the titanium dioxide and the talcum powder; 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 oligomer polyol is one or more of trimethylolpropane-propylene oxide polyether, glycerol-propylene oxide polyether and pentaerythritol-propylene oxide polyether.
Preferably, the isocyanate is one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and polymethylene polyphenyl isocyanate (PAPI).
Preferably, the chain extending crosslinker is Ethylene Glycol (EG) or neopentyl glycol (NPG).
Preferably, the foaming agent is cyclopentane, dichloromethane or petroleum ether; the foam stabilizer is silicone oil; the catalyst is bis (dimethylaminoethyl) riddle or cyclohexyl methyl tertiary amine; the pore former is Voranol CP1421 or Desmophen41WB 01.
The construction method of the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant adopts the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant,
mixing the base material and the curing agent for mixing to form a mixture on site, spraying the mixture on the surface of the cold-sprayed zinc coating to be sealed, and spraying a polyurethane foaming material after the mixture is preliminarily dried; and after the foaming is finished, spraying a hydrophobic material.
Preferably, the spraying thickness of the mixture is 1-2 mm, and the spraying thickness of the polyurethane foam material is 2-3 mm; the spraying thickness of the hydrophobic material is 20-50 microns.
The invention provides an environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant and a construction method thereof, and the sealant has the following beneficial effects:
1. the invention adopts a step-by-step coating method, utilizes epoxy resin-based spray paint as a sealing agent, sprays polyurethane foaming material again, and finally sprays graphene, so that the sealing layer formed totally has the performance of hydrophobicity and moisture resistance.
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.
An environment-friendly hydrophobic moisture-resistant cold-spray zinc sealant,
comprises a base material, a curing agent for mixing, a polyurethane foaming material and a hydrophobic material:
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 polyurethane foaming material at least comprises the following components in percentage by mass:
oligomer polyol: 45-60 parts;
25-35 parts of isocyanate;
chain extension crosslinking agent: 0.5 to 1 portion;
foaming agent: 2-5 parts;
foam stabilizer: 0.5 to 1 portion;
catalyst: 0.5 to 1 portion;
1-2 parts of a pore forming agent.
Further, the hydrophobic material is graphene.
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.
Further, the thixotropic agent is hydrogenated castor oil, organic bentonite, fumed silica or polyamide wax; the pigment is one of titanium dioxide and talcum powder or a mixture of the titanium dioxide and the talcum powder; 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 oligomer polyol is one or more of trimethylolpropane-propylene oxide polyether, glycerol-propylene oxide polyether and pentaerythritol-propylene oxide polyether.
Further, the isocyanate is one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and polymethylene polyphenyl isocyanate (PAPI).
Further, the chain-extending cross-linking agent is Ethylene Glycol (EG) or neopentyl glycol (NPG).
Further, the foaming agent is cyclopentane, dichloromethane or petroleum ether; the foam stabilizer is silicone oil; the catalyst is bis (dimethylaminoethyl) riddle or cyclohexyl methyl tertiary amine; the pore former is Voranol CP1421 or Desmophen41WB 01.
The construction method of the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant adopts the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant,
mixing the base material and the curing agent for mixing to form a mixture on site, spraying the mixture on the surface of the cold-sprayed zinc coating to be sealed, and spraying a polyurethane foaming material after the mixture is preliminarily dried; and after the foaming is finished, spraying a hydrophobic material.
Further, the spraying thickness of the mixture is 1-2 mm, and the spraying thickness of the polyurethane foam material is 2-3 mm; the spraying thickness of the hydrophobic material is 20-50 microns.
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 polyurethane foaming material at least comprises the following components in percentage by mass:
oligomer polyol: 45 parts of (1);
35 parts of isocyanate;
chain extension crosslinking agent: 0.5 part;
foaming agent: 5 parts of a mixture;
foam stabilizer: 0.5 part;
catalyst: 1 part;
1 part of pore forming agent.
The hydrophobic material is graphene.
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 oligomer polyol is trimethylolpropane-propylene oxide polyether, glycerol-propylene oxide polyether and pentaerythritol-propylene oxide polyether mixed according to the ratio of 1:2: 2.
The isocyanate is Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and polymethylene polyphenyl isocyanate (PAPI) mixed according to the ratio of 1:1: 2.
The chain extension crosslinking agent is Ethylene Glycol (EG).
The foaming agent is cyclopentane; the foam stabilizer is silicone oil; the catalyst is bis (dimethylaminoethyl) riddle; the cell opener is Voranol CP 1421.
The construction method of the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant adopts the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant,
mixing the base material and the curing agent for mixing to form a mixture on site, spraying the mixture on the surface of the cold-sprayed zinc coating to be sealed, and spraying a polyurethane foaming material after the mixture is preliminarily dried; and after the foaming is finished, spraying a hydrophobic material.
Further, the spraying thickness of the mixture is 1mm, and the spraying thickness of the polyurethane foam material is 2 mm; the spray thickness of the hydrophobic material was 20 microns.
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 polyurethane foaming material at least comprises the following components in percentage by mass:
oligomer polyol: 60 parts;
35 parts of isocyanate;
chain extension crosslinking agent: 1 part;
foaming agent: 2 parts of (1);
foam stabilizer: 0.5 part;
catalyst: 0.5 part;
1 part of pore forming agent.
The hydrophobic material is graphene.
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 ratio and mixing 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 oligomer polyol is trimethylolpropane-propylene oxide polyether.
Further, the isocyanate is Toluene Diisocyanate (TDI).
Further, the chain-extending cross-linking agent is neopentyl glycol (NPG).
Further, the foaming agent is cyclopentane; the foam stabilizer is silicone oil; the catalyst is cyclohexyl methyl tertiary amine; the cell opener is Desmophen41WB 01.
The construction method of the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant adopts the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant,
mixing the base material and the curing agent for mixing to form a mixture on site, spraying the mixture on the surface of the cold-sprayed zinc coating to be sealed, and spraying a polyurethane foaming material after the mixture is preliminarily dried; and after the foaming is finished, spraying a hydrophobic material.
Further, the spraying thickness of the mixture is 2mm, and the spraying thickness of the polyurethane foam material is 3 mm; the spray thickness of the hydrophobic material was 50 microns.
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 polyurethane foaming material at least comprises the following components in percentage by mass:
oligomer polyol: 50 parts of a mixture;
30 parts of isocyanate;
chain extension crosslinking agent: 0.7 part;
foaming agent: 3.5 parts;
foam stabilizer: 0.7 part;
catalyst: 0.8 part;
1.5 parts of pore forming agent.
The hydrophobic material is graphene.
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 oligomer polyol is pentaerythritol-propylene oxide polyether.
The isocyanate is polymethylene polyphenyl isocyanate (PAPI).
The chain extension crosslinking agent is Ethylene Glycol (EG).
The foaming agent is petroleum ether; the foam stabilizer is silicone oil; the catalyst is bis (dimethylaminoethyl) riddle; the cell opener is Voranol CP 1421.
The construction method of the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant adopts the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant,
mixing the base material and the curing agent for mixing to form a mixture on site, spraying the mixture on the surface of the cold-sprayed zinc coating to be sealed, and spraying a polyurethane foaming material after the mixture is preliminarily dried; and after the foaming is finished, spraying a hydrophobic material.
The spraying thickness of the mixture is 1.5 mm, and the spraying thickness of the polyurethane foam material is 2.5 mm; the spray thickness of the hydrophobic material was 40 microns.
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.
Cold spray zinc spraying was first performed, and then the seal primers formulated according to the formulations of the 3 examples above were sprayed on the cold spray zinc layer, respectively, along with control samples, in which no polyurethane foam was sprayed, and flexibility, impact resistance, adhesion, and cross hatch were tested, respectively.
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.
A cold zinc spray was first applied and in this test, the polyurethane foam was not sprayed. The seal primers formulated according to the formulations of the 3 examples described above were then sprayed onto the cold-sprayed zinc layer, respectively, to scribe a scratch of exposed substrate in the middle of the surface of the coating, the size of the scratch being 150mm x 1mm, together with control samples, four of which were prepared for each test panel, three of which were tested, one being used as a reference. 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 environment-friendly hydrophobic moisture-resistant cold-spray zinc sealant is characterized in that:
comprises a base material, a curing agent for mixing, a polyurethane foaming material and a hydrophobic material:
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 polyurethane foaming material at least comprises the following components in percentage by mass:
oligomer polyol: 45-60 parts;
25-35 parts of isocyanate;
chain extension crosslinking agent: 0.5 to 1 portion;
foaming agent: 2-5 parts;
foam stabilizer: 0.5 to 1 portion;
catalyst: 0.5 to 1 portion;
1-2 parts of a pore forming agent.
2. The environmentally friendly hydrophobic moisture resistant cold spray zinc sealant of claim 1, wherein:
the hydrophobic material is graphene.
3. The environmentally friendly hydrophobic moisture resistant cold spray zinc sealant of claim 1, 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.
4. The environmentally friendly hydrophobic moisture resistant cold spray zinc sealant of claim 1, wherein:
the thixotropic agent is hydrogenated castor oil, organic bentonite, fumed silica or polyamide wax; the pigment is one of titanium dioxide and talcum powder or a mixture of the titanium dioxide and the talcum powder; 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 a certain proportion.
5. The environmentally friendly hydrophobic moisture resistant cold spray zinc sealant of claim 1, wherein: the oligomer polyol is one or a mixture of trimethylolpropane-propylene oxide polyether, glycerol-propylene oxide polyether and pentaerythritol-propylene oxide polyether.
6. The environmentally friendly hydrophobic moisture resistant cold spray zinc sealant of claim 1, wherein: the isocyanate is one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and polymethylene polyphenyl isocyanate (PAPI).
7. The environmentally friendly hydrophobic moisture resistant cold spray zinc sealant of claim 1, wherein: the chain-extending cross-linking agent is Ethylene Glycol (EG) or neopentyl glycol (NPG).
8. The environmentally friendly hydrophobic moisture resistant cold spray zinc sealant of claim 1, wherein: the foaming agent is cyclopentane, dichloromethane or petroleum ether; the foam stabilizer is silicone oil; the catalyst is bis (dimethylaminoethyl) riddle or cyclohexyl methyl tertiary amine; the pore former is Voranol CP1421 or Desmophen41WB 01.
9. The construction method of the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant adopts the environment-friendly hydrophobic moisture-resistant cold-sprayed 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 mixture on the surface of the cold-sprayed zinc coating to be sealed, and spraying a polyurethane foaming material after the mixture is preliminarily dried; and after the foaming is finished, spraying a hydrophobic material.
10. The construction method of the environment-friendly hydrophobic moisture-resistant cold-sprayed zinc sealant as claimed in claim 9, characterized in that:
the spraying thickness of the mixture is 1-2 mm, and the spraying thickness of the polyurethane foam material is 2-3 mm; the spraying thickness of the hydrophobic material is 20-50 microns.
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| CN113214724A (en) * | 2021-06-03 | 2021-08-06 | 上海净颖环保科技股份有限公司 | Environment-friendly chemical coating and use method thereof |
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