CN102676029A - Polyurethane anti-corrosion priming paint sprayed on steel structure in abyssal environment - Google Patents
Polyurethane anti-corrosion priming paint sprayed on steel structure in abyssal environment Download PDFInfo
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Abstract
The invention relates to a polyurethane anti-corrosion priming paint sprayed on a steel structure in an abyssal environment. The priming paint is polyurethane modified epoxy solvent-free priming paint; after being subjected to polyurethane modification, the epoxy solvent-free priming paint has higher compressive strength than a common solvent-free epoxy coating, and has higher adhesion strength with the steel structure and sprayed polyurethane. After the matching of the polyurethane modified epoxy solvent-free priming paint and the spray polyurethane, the drawing strength between the whole coating and the steel structure is tested to be larger than or equal to 10 MPa. The polyurethane modified epoxy solvent-free priming paint solves the problems of low compressive strength and polyurea adhesion strength of the common solvent-free epoxy priming paint used in the abyssal environment, and also solves the problem of low steel structure adhesion strength of a polyurethane type priming paint in the abyssal environment.
Description
Technical field
The invention belongs to the preservative treatment technology field, be specifically related to a kind of deep-marine-environment steelwork spraying polyurethane anti-corrosion primer.
Background technology
Receive the defective of ocean environment and material itself, most materials, particularly metal species all can be corroded.The corrosion of material has not only caused enormous economic loss, and causes the pollution of ocean environment.Anticorrosion technique is varied, when steelwork protects, usually is used in combination multiple technologies.Wherein, coating antiseptic is the simplest, a utilization technology the most widely.Protective system receives the promotion of rules, the energy, requirement for anticorrosion to experience complicated, the environmental protection multi-functional, intelligent to high-performance of function singleness, high VOC content, construction, the incorporate development of paint spraying.
Anticorrosion of steel structure is a branch of whole heavy anticorrosion industry.In period the earliest, because coating technology and starting material are limited, great majority use vegetables oil or sea life to add mineral color, process coating in conjunction with rosinol.During the World War II, heavy anticorrosion speciality coating has obtained fast development.A lot of new coating varieties has appearred, alkydpaints, chlorinated rubber coating, epoxy coating, polyurethane coating or the like.In recent years, develop towards high solid, solvent-free, water-based direction, paint spraying has been initiated new requirement because countries in the world promote protective system to the consumption of organic volatile content statute of limitation and hazardous air pollutants Abgasgesetz, the energy.
The nineties in 20th century, the spraying polyurethane technology was arisen at the historic moment.Owing to can satisfy needs, develop into the fastest, the state-of-the-art technology of current ocean protection industrial development in safety, construction, performance.With other ocean protective coating compared with techniques; Spraying polyurethane has outstanding wear-resisting chemical resistance, disposable spray finishing thickness, the advantage such as rate of drying and rapid construction fast of undermining, and it is heavy anticorrosion to make the spraying polyurethane coating technology be widely used in both at home and abroad steelwork such as various heavy anticorrosion industrial circles such as combustion gas basin, pipeline, marine ship.
Because spraying polyurethane coating several seconds inner gel solidifies; Several minutes can reach walking intensity; To the moistening of steelwork with adhere to the aspect certain defective arranged, limited the utilization of spraying polyurethane coating, the priming paint technology becomes the gordian technique of spraying polyurethane coating to the corrosion-resistant protection of steelwork.Priming paint effectively sealed except the corrosion that can sustain seawater and high pressure, to the steelwork surface, that also will between steelwork and spraying polyurethane, play a bridge was used for improving sticking power.
Patent CN200910304890.4 has invented a kind of ocean steel construction spray polyurea and has used anti-corrosion primer, improves the sticking power of polyureas to the steelwork surface, to improve its antiseptic property.The anti-corrosion primer of this invention is the dual-component polyurethane type; Wherein the A component is made up of epoxy resin, tackifying resin, antirust color stuffing, thixotropic agent, solvent and other auxiliary agents, and the B component is by isocyanic ester, macromole hydroxyl polyol, micromolecular hydroxyl polyvalent alcohol and solvent composition.This invention priming paint has following characteristics: 1) good to the steelwork surface adhesion force, it draws back method sticking power and is >=9MPa; 2) snappiness is good, and is good with the matching capacity of spray polyurea; 3) low surface treatment, easy construction, repainting hours is the shortest to be 16h, length can reach 60 days; 4) antiseptic property is excellent.
Spraying polyurethane coating is when carrying out anticorrosion protection to steelwork, and in order to improve the adhesion strength to steelwork, common coating prime lacquer improves the sticking power to steelwork in the construction process of reality.
The existing spraying polyurethane technical development time is short, and research mainly concentrates in the research and development and improvement of material of main part, and the research report of supplementary material is less.The supporting priming paint of having reported is epoxies, polyurethanes priming paint basically.Problems such as the cohesive strength of existence of epoxies priming paint and spraying polyurethane is low, polyurethanes priming paint exists and the low problem of steelwork cohesive strength.Therefore these two types of priming paint are mainly used in the less demanding occasion of performance index.Spraying polyurethane itself can bear the pressure of deep-marine-environment seawater, but owing to there is not corresponding supplementary material, has limited the application in deep-marine-environment.Patent CN200910304890.4 polyurethane-type anti-corrosion primer A component contains the solvent of 20-40%, and the B component contains the solvent of 20-60%, and the solvent of anti-corrosion primer is about 20-50%.Anti-corrosion primer and steelwork surface adhesion force are good, and it draws back method sticking power and is >=9MPa, but the situation of anti-corrosion primer pair and the sticking power of polyureas is less than explanation.
Solvent is about the anti-corrosion primer of 20-50%, has following shortcoming:
1) aspect of performance, solvent-borne type anti-corrosion primer are with the volatilization of solvent, and coating surface is prone to produce pinprick, causes the paint film disadvantage, reduces the antiseptic property of paint film.
2) the multiple tracks construction because the single track coating thickness is low, need be carried out in application aspect, solvent-borne type anti-corrosion primer in construction, efficient is low, the construction period is long.And arris and protruding part paint film are prone to trickling, need special processing.The solvent-borne type protective system needs film forming after solvent evaporates, and therefore the restriction of dew point is arranged when application.
3) all there are the discharging of organic volatile in secure context, solvent-borne type protective system in producing, constructing, increased disaster hidden-trouble, have increased expenses such as safety precaution cost, waste treatment cost.
Summary of the invention
The present invention has overcome the deficiency of prior art; A kind of deep-marine-environment steelwork spraying polyurethane anti-corrosion primer---the solvent-free priming paint of polyurethane modified epoxy has been proposed; The protection to steelwork in deep-marine-environment of spraying polyurethane coating is expanded in priming paint and the supporting use of spraying polyurethane coating.
Technical scheme of the present invention is: a kind of deep-marine-environment steelwork spraying polyurethane anti-corrosion primer, comprise A component and B component, said A component and B component 3: 1 by weight～6: 1 are mixed, the back that stirs deep-marine-environment steelwork spraying polyurethane anti-corrosion primer; The composition and the weight percent of said A component are following: the A component comprises polyurethane modified epoxy resin, rust-stabilising pigment, mineral filler, thixotropic agent, auxiliary agent, and 0.2-2%, the auxiliary agent that 10-20%, the thixotropic agent that 20-50%, the mineral filler that 30-50%, the rust-stabilising pigment that wherein said polyurethane modified epoxy resin accounts for A component gross weight accounts for A component gross weight accounts for A component gross weight accounts for A component gross weight accounts for the 0.5-8% of A component gross weight;
The composition and the weight percent of said B component are following: the B component comprises amine curing agent, catalyzer, and 90-99%, the catalyzer that wherein said amine curing agent accounts for B component gross weight accounts for the 1-10% of B component gross weight.
In the A component, it is polyurethane-modified that polyurethane modified epoxy resin selects for use epoxy equivalent (weight) to be that the liquid epoxies of 196-320g/eq carries out, and the epoxy equivalent (weight) of polyurethane-modified back epoxy resin is 200-280g/eq.
Polyurethane modified epoxy resin adopts polyether glycol and isocyanates to carry out polyurethane modified epoxy resin, and said polyether glycol is a molecular weight at one or more of the PPG of 1000-5000, PTMG type polyether glycol; Said isocyanates is one or more of tolylene diisocyanate (TDI), diphenylmethanediisocyanate (MDI), polymeric MDI (PAPI), liquefied mdi, isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI).
In the A component, said rust-stabilising pigment is one or more of metal-powder, MOX, phosphoric acid salt, modified phosphate, chromic salt, modification chromic salt, organic inhibitor.
In the A component, said mineral filler is a kind of of mica powder, glass flake, talcum powder, permanent white, lime carbonate, kaolin, wollastonite powder, white titanium pigment, silicon powder, calcium sulfate, carbon black, filamentary material and several kinds.
In the A component, said thixotropic agent is one or more in THIXCIN, organobentonite, aerosil, polyamide wax, polyethylene wax, the modified urea solution.
In the A component, said auxiliary agent is one or more of wetting dispersing agent, skimmer, adhesion promoter, flow agent, reactive thinner.
In the B component, said amine curing agent is one or more of polymeric amide, aliphatic amide, aliphatic cyclic amine, cardanol amine, isophorone amine, ether amine, aromatic amine.
In the B component, said catalyzer is one or more of amine, organo-metallic class catalyzer.
The present invention has following beneficial effect:
1) the present invention can eliminate the coating pin hole because of solvent-free volatilization, improves permeability resistance and corrosion resistance nature; The single track coating thickness can reach 200um during solvent-free primer painting, and once spraying can reach the coating thickness requirement, has reduced the number of times of construction, has shortened the construction time; Solvent-free priming paint is solvent-free volatilization in film process, and construction is restriction unconditionally, and the wasting of resources of avoiding solvent evaporates to cause, reduces to environment damage the cost that has reduced production simultaneously, deposits, transports and constructed;
2) the present invention has the ultimate compression strength higher than common solventless epoxy coating, the characteristics high with the cohesive strength of steelwork, spraying polyurethane.After the solvent-free priming paint of polyurethane modified epoxy, spraying polyurethane coating are supporting, the pull strength >=10MPa of test Bulk coat and steelwork.The solvent-free priming paint of polyurethane modified epoxy solved common non-solvent epoxy class priming paint compressive strength in the deep-marine-environment low, with the low problem of cohesive strength of spraying polyurethane coating, also solved polyurethanes priming paint problem low in deep-marine-environment simultaneously with the steelwork cohesive strength.
Embodiment:
Embodiment 1
The deep-marine-environment steelwork spraying polyurethane anti-corrosion primer of this case study on implementation can be used in the dark marine site of 500-1000 rice.Prepare the priming paint of this case study on implementation, may further comprise the steps:
Preparation A component
With epoxy resin 28%, PPG polyethers 10%, tolylene diisocyanate 2% synthetic polyurethane modified epoxy resin, zn phosphate 10%; Mica powder 2%, red iron oxide 26%, talcum powder 8%, permanent white 8%; Organic inhibitor 2%, aerosil 1%, wetting dispersing agent 1.5%, skimmer 0.5%; Adhesion promoter 1% drops into agitation vat, after specific equipment is uniformly dispersed, the A component.
Preparation B component
Polyamide curing agent 50%, aromatic amine 48%, catalyzer 2% mixes, the back discharging that stirs, the B component.
Solidify
A, B component are mixed according to weight ratio at 5: 1, high-speed stirring evenly the back deep-marine-environment steelwork spraying polyurethane anti-corrosion primer.
Embodiment 2
The deep-marine-environment steelwork spraying polyurethane anti-corrosion primer of this case study on implementation can be used in the dark marine site of 1000-1500 rice.Prepare the priming paint of this case study on implementation, may further comprise the steps:
Preparation A component
With epoxy resin 28%, PPG polyethers 12%, diphenylmethanediisocyanate 2.5% synthetic polyurethane modified epoxy resin, modified zinc phosphate 8%; Mica iron oxide red 32.5%, permanent white 10%, organic inhibitor 2%; Aerosil 1%, wetting dispersing agent 2%, skimmer 0.8%; Adhesion promoter 1.2% drops into agitation vat, after specific equipment is uniformly dispersed, the A component.
Preparation B component
Polyamide curing agent 43%, cardanol amine 45%, ether amine 10%, catalyzer 2% mixes, the back discharging that stirs, the B component.
Solidify
A, B component are mixed according to weight ratio at 6: 1, high-speed stirring evenly the back deep-marine-environment steelwork spraying polyurethane anti-corrosion primer.
Embodiment 3
The deep-marine-environment steelwork spraying polyurethane anti-corrosion primer of this case study on implementation can be used in the dark marine site of 1500-2000 rice.Prepare the priming paint of this case study on implementation, may further comprise the steps:
Preparation A component
With epoxy resin 30%, PTMG polyethers 12%, isophorone diisocyanate 2.5% synthetic polyurethane modified epoxy resin, metal-powder 40%; Modified zinc phosphate 6%, filamentary material 2%, organic inhibitor 2%, aerosil 1%; Wetting dispersing agent 2%, skimmer 1%, adhesion promoter 2%; Flow agent 1% drops into agitation vat, after specific equipment is uniformly dispersed, the A component.
Preparation B component
Cardanol amine hardener 50%, modified fatty amine 36%, ether amine 12%, catalyzer 2% mixes, the back discharging that stirs, the B component.
Solidify
A, B component are mixed according to weight ratio at 4: 1, high-speed stirring evenly the back deep-marine-environment steelwork spraying polyurethane anti-corrosion primer.
Embodiment 4
The deep-marine-environment steelwork spraying polyurethane anti-corrosion primer of this case study on implementation can be used in the dark marine site of 2000-3000 rice.Prepare the priming paint of this case study on implementation, may further comprise the steps:
Preparation A component
With epoxy resin 36.5%, PTMG polyethers 15%, isophorone diisocyanate 4% synthetic polyurethane modified epoxy resin, white titanium pigment 25%; Modified zinc phosphate 10%, organic inhibitor 2%, aerosil 1.5%; Wetting dispersing agent 2.5%, skimmer 1.5%, adhesion promoter 1%; Flow agent 1% drops into agitation vat, after specific equipment is uniformly dispersed, the A component.
Preparation B component
Cardanol amine 50%, isophorone amine 31%, ether amine 15%, catalyzer 4% mixes, the back discharging that stirs, the B component.
Solidify
A, B component are mixed according to weight ratio at 3: 1, and high-speed stirring is even, when application, lays filamentary material, solidify the back deep-marine-environment steelwork spraying polyurethane anti-corrosion primer.
On the steelwork of sandblast grade Sa2.5 that the solvent-free priming paint of modified epoxy, blank priming paint and the spraying polyurethane of embodiment 1, embodiment 2, embodiment 3, embodiment 4 preparations is supporting; Bulk coat has carried out the test of ultimate compression strength, pull strength, salt spray resistance 1000h, and test result is seen table 1.
Claims (9)
1. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer is characterized in that: comprise A component and B component, said A component and B component were mixed in 3: 1 by weight～6: 1, the back that stirs deep-marine-environment steelwork spraying polyurethane anti-corrosion primer; The composition and the weight percent of said A component are following: the A component comprises polyurethane modified epoxy resin, rust-stabilising pigment, mineral filler, thixotropic agent, auxiliary agent, and 0.2-2%, the auxiliary agent that 10-20%, the thixotropic agent that 20-50%, the mineral filler that 30-50%, the rust-stabilising pigment that wherein said polyurethane modified epoxy resin accounts for A component gross weight accounts for A component gross weight accounts for A component gross weight accounts for A component gross weight accounts for the 0.5-8% of A component gross weight; The composition and the weight percent of said B component are following: the B component comprises amine curing agent, catalyzer, and 90-99%, the catalyzer that wherein said amine curing agent accounts for B component gross weight accounts for the 1-10% of B component gross weight.
2. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer according to claim 1; It is characterized in that: in the A component; It is polyurethane-modified to select for use epoxy equivalent (weight) to be that the liquid epoxies of 196-320g/eq carries out, and the epoxy equivalent (weight) of polyurethane-modified back epoxy resin is 200-280g/eq.
3. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer according to claim 2; It is characterized in that: said polyurethane modified epoxy resin is polyether glycol and isocyanates polyurethane modified epoxy resin, and said polyether glycol is a molecular weight at one or more of the PPG of 1000-5000, PTMG type polyether glycol; Said isocyanates is one or more of tolylene diisocyanate (TDI), diphenylmethanediisocyanate (MDI), polymeric MDI (PAPI), liquefied mdi, isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI).
4. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer according to claim 1; It is characterized in that: in the A component, said rust-stabilising pigment is one or more of metal-powder, MOX, phosphoric acid salt, modified phosphate, chromic salt, modification chromic salt, organic inhibitor.
5. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer according to claim 1; It is characterized in that: in the A component, said mineral filler is one or more of mica powder, glass flake, talcum powder, permanent white, lime carbonate, kaolin, wollastonite powder, white titanium pigment, silicon powder, calcium sulfate, carbon black, filamentary material.
6. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer according to claim 1; It is characterized in that: in the A component, said thixotropic agent is one or more in THIXCIN, organobentonite, aerosil, polyamide wax, polyethylene wax, the modified urea solution.
7. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer according to claim 1 is characterized in that: in the A component, said auxiliary agent is one or more of wetting dispersing agent, skimmer, adhesion promoter, flow agent, reactive thinner.
8. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer according to claim 1; It is characterized in that: in the B component, said amine curing agent is one or more of polymeric amide, aliphatic amide, aliphatic cyclic amine, cardanol amine, isophorone amine, ether amine, aromatic amine.
9. deep-marine-environment steelwork spraying polyurethane anti-corrosion primer according to claim 1 is characterized in that: in the B component, said catalyzer is one or more of amine, organo-metallic class catalyzer.
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| CN103342955A (en) * | 2013-07-20 | 2013-10-09 | 海洋化工研究院有限公司 | Eradication-resisting and coating-preventing marker paint for fishery vessel |
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Application publication date: 20120919 |