CN1840586A - Aqueous inorganic silicate zinc-rich primer - Google Patents
Aqueous inorganic silicate zinc-rich primer Download PDFInfo
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- CN1840586A CN1840586A CN 200510049506 CN200510049506A CN1840586A CN 1840586 A CN1840586 A CN 1840586A CN 200510049506 CN200510049506 CN 200510049506 CN 200510049506 A CN200510049506 A CN 200510049506A CN 1840586 A CN1840586 A CN 1840586A
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Abstract
The invention relates to a priming paint, in particular a water-based inorganic silicate zinc-rich priming paint prepared from main raw materials of super fine zinc powder and inorganic silicate, as well as other auxiliary agent, which comprises 300-700 mesh zinc powder 60-80% and base material 20-40%.
Description
Technical field
The present invention relates to a kind of priming paint, relating in particular to a kind of super-fine zinc dust, inorganic silicate of adopting is the aqueous inorganic silicate zinc-rich primer that main raw material and other auxiliary agent are made.
Background technology
Corrosion of metal is that metal is subjected to the chemistry of surrounding medium or electrochemical action and ruined phenomenon.Corrosion of metal spreads all over the national economy every field, has brought tremendous loss to national economy.In the flourishing country of industry, the direct economic loss that corrosion causes accounts for 1%～4% of total value of production in national economy, and 20% of the Yue Zhan Productivity amount of the iron and steel of annual rust corrosion has 30% equipment to scrap because of corrosion approximately.In China, owing to up to more than 30,000,000,000 yuan, account for 4% of gross national product financial loss every year that metallic corrosion causes.For a long time, people adopt multiple technologies that metal is protected always, prevent that corrosive from taking place.Wherein, one of method that the hardware protection against corrosion is effective, the most the most frequently used is at metallic surface coating erosion shield, with isolated corrosive medium and metallic matrix.
The method that common people tackle metallic corrosion adopts method zinc-plated and protective system, zinc-plated cost height, and construction trouble and harmful can cause secondary pollution, slowly is eliminated within the specific limits.And protective system has excellent performance, the incomparable advantage of some other materials such as easily manufactured, cheap, therefore becomes top-priority object when selecting anticorrosive measure.Along with the maturation of anticorrosion technique, anticorrosive coating also will be further developed.What people were used in the past is organic coating, as anticorrosive metal paints such as epoxy resin, polyurethaness, because organic coating thermotolerance extreme difference, weathering resistance are poor, easily produce static, absorb the dust in the atmosphere, shortcomings such as easy efflorescence, so present people use inorganic paint usually instead such as Chinese patent application (02134264.4) discloses a kind of electrostatically conductive oil-tolerant paint containing rich zinc and silicic acid, it is by following method production: (1) mixes tetraethoxy, dehydrated alcohol, stirs, and carries out alcoholysis reaction; (2) drip hydrochloric acid after the pure water dilution, making the pH value is 2～3, leaves standstill to room temperature, adds organosilicon amine, mixes; (3) add zinc powder, mix.The electrostatically conductive oil-tolerant paint containing rich zinc and silicic acid of this invention, though slightly have the characteristics that electrostatic conductive performance is stable, corrosion resisting property is stable, but since the related product of this patent application often to exist viscosity low, poor with substrate adhesion, be easy to come off, the coating of making easily precipitates, and is more serious with zinc powder mixing postprecipitation, easily gel, shelf-time weak point, high temperature resistant also poor with chemical property; Can't on the high request steel surface, reach service requirements; And for example Chinese patent application (01815575.8) relates to a kind of to being intended to make the method for priming with the steel of cover coating, steel usefulness comprises the prime coating of silicon-dioxide base-material in the method, wherein this base-material comprises the silica hydrosol of alumina stable and randomly, the small amount of alkali metal silicate, the SiO of described base-material
2/ M
2O mol ratio (wherein M represents the summation of basic metal and ammonium ion) was at least 6: 1, and wherein undercoat be dried to refer to touch the degree of doing after, optional other solution-treated in order to the film toughness that improves undercoat.This type of coating rate of drying is extremely slow, and when reacting incomplete, paint film property can't reach requirement and must wash catalysed promoted with solution such as phosphoric acid, magnesium chlorides, and paint film is subjected to construction infection bigger, and performance is extremely unstable, and coating market gradually is eliminated out.
Summary of the invention
There is problem poor with substrate adhesion, poor heat resistance in the product that the present invention is primarily aimed at the prior art gained, by change to chemical structure and prescription, provide a kind of strong, have outstanding preservative property, resistant to elevated temperatures novel aqueous inorganic silicate zinc-rich primer with substrate adhesion.
Another object of the present invention be to provide a kind of weathering resistance, wear resistance, radiation resistance, storage time length, galvanic protection excellent performance, can cover and be coated with multilayer; can with the supporting use of decorative powder coatings, can reach the aqueous inorganic silicate zinc-rich primer of not only efficient corrosion resisting but also both artistic and practical multiple effect.This product is water-based, and is water-soluble, nontoxic, free from environmental pollution, and production safety, construction safety, storing and transporting security are harmless.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of aqueous inorganic silicate priming paint comprises zinc powder 60%～80%, base-material 20%～40%; It is characterized in that the requirement of described zinc powder is 300～700 orders, the modulus of selected host mesosilicic acid salt is defined as 3.4-4.8 through repeatedly testing: 1.Mainly be to be that host and zinc powder mix with silicate and a little auxiliary, the coating back relies on and absorbs the Carbon Dioxide in Air step reaction and solidify.Reaction mechanism is as follows:
Described base-material is an inorganic silicate, described inorganic silicate is one or more in lithium silicate, water glass, the potassium silicate, wherein must contain potassium silicate, its content is 10-20%, by water glass to its modification, can make paint film have the stability of excellent water tolerance, abrasion resistance raising long storage, can improve execution of coating greatly to its modification with lithium silicate.
As preferably, the optimized proportion of described zinc powder is 70%～80%, and the optimized proportion of base-material is 20%～30%, and it is 400～600 orders that the optimization of described zinc powder requires.
For processing, storage, the workability of effectively improving coating, promote its curing, the morbid state that prevents to film produces, and improves the effect of film performance, described for this reason auxiliary agent is one or more in Ricinate, defoamer, the thixotropic thickening agent, and its content is 3-12%.
As preferably, described Ricinate is one or more in SN5040 poly carboxylic acid sodium, the DP-512 sodium polyacrylate.Because silicate such as potassium silicate itself have certain mealiness, after other filler mixes, gel or precipitation might appear in the polymer particle cohesion decline storage process, though used thixotropic thickening material, but strengthen the levelling property of paint film, also need use dispersion agent, to adapt to the coating requirement of various metallic surfaces, use ionic dispersant can utilize its charge repulsion to stop particulate approaching, reach moistening dispersive effect, can also improve water tolerance, generally select SN5040 poly carboxylic acid sodium, DP-512 sodium polyacrylate for use, consumption is at 0.3-3.5%.
In order to reduce the surface tension of solution, improve consistency, bubble and the foam eliminating or suppress to produce in coating processing or the construction process, described for this reason defoamer is one or more among SPG, the SN154,1620.Defoamer: the production process at liquid comprises in the use of auxiliary agents such as dispersion agent, after reducing, surface tension can produce foam, these foams link together when fluid surface does not break, form bubble, can effectively produce tangible capillary imbalance in foam system, but the consumption of defoamer wants suitable, the defoamer consumption then floats on the surface very little entirely, it is inoperative that usefulness excessive then too much is dispersed in the system, and consumption is at 0.5-5%.
As preferably, described thixotropic thickening agent is one or more in modified alta-mud, silicate powder fiber, the neusilin clay.Can give paint structure viscosity, make coating form thixotropic fluid, prevent that coating flowing hanging, loose colour from becoming flower, thixotropic thickening agent: there is certain viscosity in solution itself, and its viscosity had both depended on the size of velocity of shear after adding thixotropic thickening agent, the time of also depending on shearing action, promptly constantly stir or the coating thixotropic fluid with certain speed, after stirring or applying, viscosity will return to the size before shearing gradually, generally select wilkinite, powdered silicate fiber, consumption is at 0.5-4.5%.
Therefore, the present invention has the following advantages:
1, adopt super-fine zinc dust, modified inorganic silicate be main component change in chemical structure with on filling a prescription with high performance adjuvant obtain having outstanding preservative property, resistant to elevated temperatures pair of component protective system.
2, has fast drying, good sticking power and galvanic protection effect, excellent solvent-resistance energy, resistance to elevated temperatures, wear resisting property and anti-cutting and welding property.
3, this product is nontoxic, and is free from environmental pollution, and production safety, construction safety, storing and transporting security are harmless.
4, have good weathering resistance, radiation resistance, storage time is long, antiseptic property is excellent, can cover and be coated with multilayer, can with the supporting use of decorative powder coatings, can reach is the efficient corrosion resisting aqueous inorganic silicate zinc-rich primer of both artistic and practical multiple effect again.
Embodiment
Specific embodiments of the invention below are described; But the present invention is not limited to these embodiment.
Embodiment 1: the base-material production process: produce necessarily required potassium silicate solution earlier, get content and be 98% water glass and industrial one-level salt of wormwood mixing and stirring and be placed on feed bin, through stirring charger compound is added in the Reaktionsofen, 1300 ℃ of temperature, under 1 normal atmosphere, generate potassium silicate after after the shrend, be mixed to join in the pressurization rotation still (2 normal atmosphere) with hot water, dissolving generates the aqueous solution, and it is 20% that reconcentration makes the content of silicon-dioxide, and modulus is 3.4.Then in like manner get Na
1SiO
3The aqueous solution, Li
2SO
3Add filler in following ratio behind the aqueous solution.
K
2SiO
310 parts
Na
2SiO
35 parts
Li
2SO
315 parts
3 parts in SN5040 poly carboxylic acid sodium
67 parts of deionized waters
Obtain base-material, get base-material and zinc powder (400 order),, obtain aqueous inorganic silicate zinc-rich primer in 1: 2.4 ratio thorough mixing with after stirring.
Comparative example 1 (according to Chinese patent application CN1390895A)
(1) tetraethoxy 100Kg, dehydrated alcohol 2.1Kg mixes, and stirs, and carries out alcoholysis reaction
(2) with 2.5Kg pure water dilute hydrochloric acid 1Kg, dripping and making PH is 2～3, leaves standstill to room temperature, adds organosilicon amine 1.5Kg, mixes.
(3) add zinc powder 18.5Kg, mix, obtain priming paint.
The comparison of the time of drying of table 1: embodiment 1 and comparative example 1 product, viscosity, fineness, sticking power level
Comparison between the qualitative performance of table 2: embodiment 1 and comparative example 1 product
| The performance numbering | Thermotolerance | Brine spray | Anti-3%NaCL soaks | Anti-gasoline | Anti-methylethylketone |
| Embodiment 1 | More than 800 ℃ | 1000h coating table | The 1000h coatingsurface | 3y is (real | 5y (actual measurement) |
| Face non-corroding, nothing foaming, intact | Non-corroding, nothing foaming, intact | Survey) no considerable change | No considerable change | ||
| Comparative example 1 | 400℃ | 500h corrodes | 500h corrodes | The corrosion of 1y big area | 1y corrodes |
Embodiment 2: the base-material production process: produce necessarily required potassium silicate solution earlier, get content and be 98% water glass and industrial one-level salt of wormwood mixing and stirring and be placed on feed bin, through stirring charger compound is added in the Reaktionsofen, 1350 ℃ of temperature, under 1.5 normal atmosphere, generate potassium silicate after after the shrend, be mixed to join in the pressurization rotation still (5 normal atmosphere) with hot water, dissolving generates the aqueous solution, and it is 25% that reconcentration makes the content of silicon-dioxide, and modulus is 4.0.Then in like manner get Na
1SiO
3The aqueous solution, Li
2SO
3Add filler in following ratio behind the aqueous solution.
K
2SiO
315 parts
Na
2SiO
37 parts
Li
2SO
310 parts
6 parts of SPG
62 parts of deionized waters
Obtain base-material, get base-material and zinc powder (500 order),, obtain aqueous inorganic silicate zinc-rich primer in 1: 3.0 ratio thorough mixing with after stirring.
Comparative example 2 (according to Chinese patent application CN1455804)
With 30.6% silicon sol, 13.5% water and 0.2% bentonite touch agent and are mixed with base-material and grant and immediately the gained base-material is mixed with 48.2% zinc powder before the dried steel, obtain priming paint.Testing its effect draws:
The comparison of the time of drying of table 3: embodiment 2 and comparative example 2 products, viscosity, fineness, sticking power level
Comparison between the qualitative performance of table 4: embodiment 2 and comparative example 2 products
| The performance numbering | Thermotolerance | Brine spray | Anti-3%NaCL soaks | Anti-gasoline | Anti-methylethylketone |
| Embodiment 2 | More than 800 ℃ | 1000h coatingsurface non-corroding, nothing foaming, intact | 1000h coatingsurface non-corroding, nothing foaming, intact | The no considerable change of 3y (actual measurement) | The no considerable change of 5y (actual measurement) |
| Comparative example 2 | 200℃ | 500h corrodes | 500h corrodes | 1y corrodes | 1y corrodes |
Embodiment 3 base-material production processes: produce necessarily required potassium silicate solution earlier, get content and be 98% water glass and industrial one-level salt of wormwood mixing and stirring and be placed on feed bin, through stirring charger compound is added in the Reaktionsofen, 1400 ℃ of temperature, under 1.5 normal atmosphere, generate potassium silicate after after the shrend, be mixed to join in the pressurization rotation still (10 normal atmosphere) with hot water, dissolving generates the aqueous solution, and it is 30% that reconcentration makes the content of silicon-dioxide, and modulus is 4.8.Then in like manner get Na
2SiO
3The aqueous solution, Li
2SO
3Add filler in following ratio behind the aqueous solution.
K
2SiO
320 parts
Na
2SiO
310 parts
Li
2SO
310 parts
4.5 parts of modified alta-muds
55.5 parts of deionized waters
Obtain base-material, get host and zinc powder (600 order),, obtain aqueous inorganic silicate zinc-rich primer in 1: 3.5 ratio thorough mixing with after stirring.
Embodiment 4
Base-material production process: produce necessarily required potassium silicate solution earlier, get content and be 98% water glass and industrial one-level salt of wormwood mixing and stirring and be placed on feed bin, through stirring charger compound is added in the Reaktionsofen, 1400 ℃ of temperature, under 1.5 normal atmosphere, generate potassium silicate after after the shrend, be mixed to join in the pressurization rotation still (10 normal atmosphere) with hot water, dissolving generates the aqueous solution, and it is 30% that reconcentration makes the content of silicon-dioxide, and modulus is 4.8.Then in like manner get Na
2SiO
3The aqueous solution, Li
2SO
3Add filler in following ratio behind the aqueous solution.
K
2SiO
320 parts
Na
2SiO
310 parts
Li
2SO
310 parts
4.5 parts of modified alta-muds
55.5 parts of deionized waters
Obtain base-material, get host and zinc powder (300 order),, obtain aqueous inorganic silicate zinc-rich primer in 1: 3.5 ratio thorough mixing with after stirring.
Embodiment 5
Base-material production process: produce necessarily required potassium silicate solution earlier, get content and be 98% water glass and industrial one-level salt of wormwood mixing and stirring and be placed on feed bin, through stirring charger compound is added in the Reaktionsofen, 1350 ℃ of temperature, under 1.5 normal atmosphere, generate potassium silicate after after the shrend, be mixed to join in the pressurization rotation still (5 normal atmosphere) with hot water, dissolving generates the aqueous solution, and it is 25% that reconcentration makes the content of silicon-dioxide, and modulus is 4.5.Then in like manner get Na
2SiO
3The aqueous solution, Li
2SO
3Add filler in following ratio behind the aqueous solution.
K
2SiO
315 parts
Na
2SiO
310 parts
Li
2SO
312 parts
1.5 parts of DP-512 sodium polyacrylates
1,620 3.0 parts
4.0 parts of silicate powder fibers
54.5 parts of deionized waters
Obtain base-material, get host and zinc powder (700 order), in 1: 3.2 ratio thorough mixing with after stirring,
Obtain aqueous inorganic silicate zinc-rich primer
The performance of the time of drying of table 5: embodiment 3～5 products, viscosity, fineness, sticking power level
The qualitative performance of table 6: embodiment 3～5 products
| The performance numbering | Thermotolerance | Brine spray | Anti-3%NaCL soaks | Anti-gasoline | Anti-methylethylketone |
| Embodiment 3 | More than 800 ℃ | 1000h coatingsurface non-corroding, nothing foaming, intact | 1000h coatingsurface non-corroding, nothing foaming, intact | The no considerable change of 3y (actual measurement) | The no considerable change of 5y (actual measurement) |
| Embodiment 4 | More than 800 ℃ | 1000h coatingsurface non-corroding, nothing foaming, intact | 1000h coatingsurface non-corroding, nothing foaming, intact | The no considerable change of 3y (actual measurement) | The no considerable change of 5y (actual measurement) |
| Embodiment 5 | More than 800 ℃ | 1000h coatingsurface non-corroding, nothing foaming, intact | 1000h coatingsurface non-corroding, nothing foaming, intact | The no considerable change of 3y (actual measurement) | The no considerable change of 5y (actual measurement) |
Application Example
Coating process: during use, get host and zinc powder (400-600 order), can adopt a kind of metal component surface that is applied in airless spraying, aerial spraying, hairbrush coating (limit nylon system), the roller coating modes such as (medium-sized, undercoats) in 1: 3.0 ratio thorough mixing with after stirring.Wet-film thickness is reached: 50-150 μ m, build reach 30-100 μ m.
Metal component surface is handled and must be removed lip-deep iron rust and oxide skin through sandblast or ball blast, reaches more than the Sweden rust cleaning standard SIS Sa2.5 level surfaceness 15-75 μ m.
The present invention makes oceanic climate, the long-acting antirust priming paint of steel construction piece under high temperature and the various environment.Be applicable to sandblast, the construction of ball blast streamline, the interior anticorrosion of tank car that be pickled with grains or in wine of steel plate or shaped steel, shop primer.Can be with lacquer welding or cutting, not influence welding quality.The present invention is applicable to that specifically offshore platform, harbour steel column, mine iron and steel support, headframe, bridge, large-scale iron structure make the anticorrosion usefulness of high-performance; the shop primer that also can be used for steel pretreated stream waterlines such as shipyard, Heavy Machinery Plant; also be applicable to the outer anticorrosion or the like of process furnace, steam-pipe, high temperature smoke exhaust pipe and other media Containers, and can be widely used in power station, bridge, metallurgy, mine, shipbuilding, chemical industry, poor car, tank car manufacturing, be the rust-proofing primer that the heavy corrosion protection of large-scale steel structure such as drilling unit is arranged.
Claims (7)
1. an aqueous inorganic silicate zinc-rich primer comprises zinc powder 60%～80%, base-material 20%～40%; It is characterized in that the requirement of described zinc powder is 300～700 orders.
2. aqueous inorganic silicate zinc-rich primer according to claim 1, it is characterized in that described base-material is an inorganic silicate, described inorganic silicate is one or more in potassium silicate, water glass, the lithium silicate, wherein must contain potassium silicate, its content is 10-20%.
3. aqueous inorganic silicate zinc-rich primer according to claim 1 is characterized in that, the optimized proportion of described zinc powder is 70%～80%, and the optimized proportion of base-material is 20%～30%, and it is 400～600 orders that the optimization of described zinc powder requires.
4. according to claim 1 or 2 or 3 described aqueous inorganic silicate zinc-rich primers, it is characterized in that, also contain auxiliary agent in the prescription of described aqueous inorganic silicate zinc-rich primer, described auxiliary agent is one or more in Ricinate, defoamer, the thixotropic thickening agent, and its content is 3-12%.
5. aqueous inorganic silicate zinc-rich primer according to claim 4 is characterized in that, described Ricinate is one or more in SN5040 poly carboxylic acid sodium, the DP-512 sodium polyacrylate.
6. aqueous inorganic silicate zinc-rich primer according to claim 4 is characterized in that, described defoamer is one or more among SPG, the SN154,1620.
7, aqueous inorganic silicate zinc-rich primer according to claim 4 is characterized in that, described thixotropic thickening agent is one or more in wilkinite, silicate powder fiber and the neusilin clay.
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