CN102604452B - Environment-friendly inorganic corrosion-resistant wearing-resistant composite coating and preparation method thereof - Google Patents

Environment-friendly inorganic corrosion-resistant wearing-resistant composite coating and preparation method thereof Download PDF

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Publication number
CN102604452B
CN102604452B CN201210103246.2A CN201210103246A CN102604452B CN 102604452 B CN102604452 B CN 102604452B CN 201210103246 A CN201210103246 A CN 201210103246A CN 102604452 B CN102604452 B CN 102604452B
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component
base fluid
coating
resistant
powder
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CN102604452A (en
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陈华辉
马峰
李国华
裴嵩峰
任英
王亦工
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China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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China University of Mining and Technology Beijing CUMTB
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Abstract

The invention provides a water-borne bicomponent inorganic corrosion-resistant wearing-resistant composite coating and a preparation method thereof. The water-borne bicomponent inorganic corrosion-resistant wearing-resistant composite coating comprises a component A and a component B, wherein the component A is bonding base fluid which is prepared by slowly adding ludox, a 1-10% silane coupling agent and deionized water to a 2-4mol/L KOH solution, stirring and keeping constant temperature; the modulus of the prepared base fluid is 4.7-5.2; the component B is Zn powder or composite powder (Zn, ZnO and Al2O3) or flaky Al which has an average particle diameter of 1-4 mu m; and the weight ratio of the component A to the component B is 1: (2-4). The coating is a potassium silicate water-borne coating, has the advantages that cost is low, drying is quick, construction period is short and no environment pollution is generated, has inflaming resistance and can be sprayed or brushed at room temperature. The coating base fluid has good stability, high binding force with a steel substrate and excellent corrosion resistance and wearing resistance. Flaky finish paint has good ultraviolet resistance and ageing resistance. The water-borne bicomponent inorganic corrosion-resistant wearing-resistant composite coating is used for corrosion prevention of various steel and iron structures.

Description

Environmental protection inorganic corrosion-proof wear composite coating and preparation method thereof
Technical field
The present invention relates to a kind of aqueous double-component inorganic paint and preparation method thereof for the anticorrosion use of steel structural part.
Background technology
Preventing and delaying in many measures of iron and steel corrosion, the most convenient most economical most effective means adopts top coat to protect exactly.Inorganic zinc coating is that for film forming base fluid (tackiness agent), zinc powder is the heavy-duty coating of pigment with inorganic polymer (as silicate, phosphoric acid salt, dichromate etc.).After zinc-rich paint is applied over steel surface formation zinc-rich coating; main anticorrosion mechanism is that (comparatively iron (-0.449V) is active for the electrochemical activity (standard potential-0.763V) of zinc for sacrificial protection; zinc is that anode loses electronics sacrifice, iron be negative electrode obtain electronics and protected) and physical shielding be used for stoping the corrosion of iron and steel.Zinc-rich paint is usually as priming paint, is coated on treated steel surface, after film forming, it applies one deck finish paint again to stop medium infiltration to reach better heavy antisepsis effect.China's the mid-80 in last century starts the investigation and application of aqueous inorganic zinc silicate coating, since the nineties, China achieves significant progress in the research, development and production of aqueous inorganic zinc silicate coating, research and develop different types of aqueous inorganic zinc silicate coating, and be used successfully to the rotproofing of the ultra-large type engineerings such as Xu Pu bridge girder steel agent structure.Wherein disclosed in No. CN1254736A, Chinese patent, a kind of protective system main component is potassium silicate, lithium silicate, SiO 2, CaSiO 3and Zn powder.This coating, in the preparation process of base fluid, will add lithium silicate and particle diameter at the precipitation SiO of 1.5-120 μm to improve modulus in potassium silicate base fluid 2particle, owing to adding the SiO of solid 2particle, the homogeneity of base fluid is tending towards unstable, adds the cost that lithium silicate then increases coating.A kind of water-based inorganic two-component zinc-rich paint disclosed in No. CN1182105, Chinese patent adopts the mixed type silicon sol containing lithium, sodium, potassium ion to stir, and add a certain amount of lithium silicate when stirring the whirlpool formed and stablizing, to improve the pH value of base fluid and to improve the stability of base fluid.In the synthetic method of high molar ratio potassium silicate binder disclosed in No. CN1182105, Chinese patent and water-based anticorrosive paint composition, then in potassium silicate base fluid, add the organic polymer emulsion of 0.5-3% to improve base fluid viscosity and thick painting.The first two patent all contains the higher lithium silicate of cost, the organic constituent of the latter then containing hostile environment.In addition, similar zinc-rich coating corrosion protection coating in the market also exists the problems such as snappiness difference, poor water resistance, scratch resistance poor performance; Organic finish paint supporting with it then causes environmental pollution, weathering resistance poor.
Summary of the invention
For the problems referred to above, the object of the invention is to: the potassium silicate base fluid that (1) provides a kind of technique simple, with low cost.The step of preparation process of this base fluid and numerical value select to be through that several years great many of experiments draws, the reliability of technique and favorable reproducibility.Compared with existing base fluid technology of preparing, its feature shows: the preparation process mesosilicic acid potassium base fluid of base fluid is directly by the SiO in silicon sol 2with KOH direct reaction, without the need to adding any catalyzer or SiO 2particle, preparation process is simple, the good stability of base fluid, and storage period is 5 years and does not precipitate or occur gel, and time limit storage period of more current 6 months improves greatly; And owing to not containing lithium silicate in bonding base fluid, therefore cost is low; (2) a kind of aqueous double-component inorganic zinc-rich anti-corrosion primer and inorganic rich aluminium finish paint are provided, overcome the problem of environmental pollution that existing supporting organic finish paint causes and weathering resistance difference; (3) by ZnO particle and EVA solid dispersible polymkeric substance, Al 2o 3particle add the snappiness, water tolerance and the resistance to marring that change coating of having fallen apart.This coating take water as solvent and thinner, Diamond Search, pollution-free, fire-retardant, meets the regulation of environmental protection; The coating base fluid good stability made, room temperature can spray or brush, rapidly dry, greatly shortens construction period; Solidity to corrosion, volatility resistance are oily and organic solvent resistance is excellent; Not by cutting, welding damage, without the harm of combustible volatile during construction; Continuous heatproof temperature is 400 DEG C, and instantaneous heatproof temperature can reach 800 DEG C, excellent heat resistance; Resistivity is low, can anti-electrostatic; Radioprotective, UV resistant, salt spray resistance, ageing resistance is good, has long-acting antirust, preservative effect; There is certain didirtresistance.
Therefore, the invention provides a kind of preparation method of water-based inorganic two-component coating, this coating by by the component A prepared and B component with 1: 2-4 weight ratio mix and make, wherein component A is bonding base fluid, B component is pigment, and the preparation process that it is characterized by described component A comprises the steps:
1) in the KOH solution of 2-4mol/L, slowly add silicon sol, add temperature and control at 60-85 DEG C, stirring velocity 200-400 rev/min,
2), after silicon sol dropwises, about reducing temperature to 40 DEG C, total solution weight is slowly added than the silane coupling agent CH for 1-10% 3si (OCH 3) 3,
3), after silane coupling agent adds, continue stirring at normal temperature 1-2 hour, make solution full and uniform,
4) add the deionized water with base fluid identical weight, the inorganic solid content weight percent making base fluid is 18-22%,
5) modulus of prepared base fluid is at 4.7-5.2, and pH value is at 10-11.
The basis of above-mentioned base fluid can add total solution weight than the benzene emulsion for 1-10%.The base fluid of above-mentioned preparation is without the need to adding SiO 2the high-module base fluid of modulus>=4.7 can be obtained with lithium silicate.
Base fluid is binding agent according to this, is prepared as follows the coating of different components and performance:
1. an aqueous dual-component inorganic silicic acid zinc paint, the weight ratio of its component A and B component is 1: 2-4, it is characterized by: B component is Zn powder, Metal Zn mass content >=95% in Zn powder; Zn powder median size is 1-4 μm; The bonding base fluid of component A for preparing according to method described in claim 1 or 2.The coating of preparation has excellent solidity to corrosion.See accompanying drawing 1a.
2. an aqueous dual-component inorganic silicic acid zinc paint, the weight ratio of its component A and B component is 1: 2-4, it is characterized by: B component is made up of Zn powder, ZnO powder and EVA redispersible polymer (also referred to as solubility latex), wherein Zn powder mass content is 90-95%, ZnO powder mass content is 1-5%, and solubility latex mass content is 1-5%; The bonding base fluid of component A for preparing according to method described in claim 1 or 2.The coating of preparation has good snappiness and water tolerance.
3. an aqueous dual-component inorganic silicic acid zinc paint, the weight ratio of its component A and B component is 1: 2-4, it is characterized by: B component is by Zn powder and Al 2o 3powder forms, and wherein Zn powder mass content is 90-98%; Al 2o 3powder mass content is 2-10%, Zn powder, Al 2o 3the median size of powder is 1-4 μm; The bonding base fluid of component A for preparing according to method described in claim 1 or 2.The coating of preparation has good wear resistance.See accompanying drawing 1b.
4. an aqueous dual-component inorganic silicic acid zinc paint, the weight ratio of its component A and B component is 1: 2-4, it is characterized by: B component is sheet Al, wherein metal A l mass content >=95% in sheet Al; Sheet Al mean thickness is 1-4 μm; The bonding base fluid of component A for preparing according to method described in claim 1 or 2.The coating of preparation has good erosion resistance and the feature of environmental protection, sees accompanying drawing 2.
High-module potassium silicate base fluid is prepared although prior art discloses, also the method that discloses is the preparation method adding silicon sol, silane coupling agent, benzene emulsion, but the selection of wherein concrete component content, the combination of especially several component content be do not have in prior art clear and definite, component content provided by the present invention is through lot of experiments and draws, and room and practical application show that effect is fine by experiment.Such as Guizhou company one yard piping, working temperature 100-200 DEG C, former coating corrosion spalling is serious.Use coating 1 of the present invention in October, 2006 instead in this pipeline external surface, now 5 years its solidity to corrosions and thermotolerance all meet service requirements.Within 2008, coating 1 is applied to cooling water circulation pipeline, and its solidity to corrosion is also greatly better than it and formerly uses corrosion-resistant paint.
Accompanying drawing illustrates (body matter)
Surface topography (the a:Zn coating of Fig. 1 coating; B:Zn+Al 2o 3compound coating)
Fig. 2 inorganic zinc silicate primer and lamella inorganic silicic acid aluminium finish paint (coating cross sections pattern)
Embodiment (body matter)
Example one
1. to prepare 500ml, modulus be 4.8 component A base fluid (potassium silicate base fluid) prepare base fluid:
The KOH solution of raw material: 4mol/L; The silicon sol of solid content 30%; Silane coupling agent; Deionized water.
Preparation: getting 200ml concentration is that the KOH solution of 4mol/L is poured in measuring cup, is slowly joined in KOH solution by 300g silicon sol, adds temperature and control at 65 DEG C, stirring velocity 400 turns/min.After silicon sol dropwises, about reducing temperature to 40 DEG C, slowly add 1wt.% solution weight silane coupling agent.After silane coupling agent adds, continue stirring at normal temperature 1-2 hour, make solution full and uniform.Add the deionized water of 500ml, make inorganics solid content be about 20%.The modulus of prepared base fluid is 4.8, and pH value is 11.This is component A.
2. prepare a kind of aqueous dual-component inorganic silicic acid zinc paint: B component is Zn powder, Metal Zn content >=95%; Zn powder median size is about 1-4 μm.The weight ratio of component A and B component is 1: 2.5.B component is joined after stirring in component A and can apply.Zn Powder Particle Size is thinner, and solidity to corrosion is better, but cost increases.
Example two
1. to prepare 500ml, modulus be 5 A base fluid (the potassium silicate base fluid containing phenylpropyl alcohol) prepare base fluid:
The KOH solution of raw material: 3mol/L; The silicon sol of solid content 28%; Silane coupling agent; Deionized water; Benzene emulsion.
Preparation: getting 200ml concentration is that the KOH solution of 3mol/L is poured in measuring cup, is slowly joined in KOH solution by 300g silicon sol, adds temperature and control at 80 DEG C, stirring velocity 300 turns/min.After silicon sol dropwises, about reducing temperature to 40 DEG C, slowly add the silane coupling agent of the total solution weight of 3wt.%.After silane coupling agent adds, continue stirring at normal temperature 1-2 hour, make solution full and uniform.Add the deionized water of 500ml, make solid content be about 20%.Add the phenylpropyl alcohol solution of 2wt.% solution weight.The modulus of prepared base fluid is 5.0, and pH value is 10.5.
2. prepare a kind of aqueous dual-component inorganic silicic acid aluminum paint: B component joined in component A, B component is sheet Al, metal A l content >=95%; Al sheet mean thickness is 3 μm..The weight ratio of component A and B component is 1: 3.This coating is coated on inorganic zinc silicate primer as finish paint, and flaky aluminum can the infiltration of mask erosion medium, makes coating have good erosion resistance and the feature of environmental protection.
Example three
1. to prepare 500ml, modulus be 5.2 A base fluid (potassium silicate base fluid) prepare base fluid:
The KOH solution of raw material: 2mol/L; The silicon sol of solid content 30%; Silane coupling agent; Deionized water.
Preparation: getting 200ml concentration is that the KOH solution of 2mol/L is poured in measuring cup, is slowly joined in KOH solution by 300g silicon sol, adds temperature and control at 70 DEG C, stirring velocity 200 turns/min.After silicon sol dropwises, about reducing temperature to 40 DEG C, slowly add 2wt.% solution weight silane coupling agent.After silane coupling agent adds, continue stirring at normal temperature 1-2 hour, make solution full and uniform.Add the deionized water of 500ml, make solid content be about 20%.The modulus of prepared base fluid is 5.2, and pH value is 10.This is component A.
2. prepare a kind of aqueous inorganic zinc silicate/Al 2o 3particles dispersed wear-resistant paint: B component is 97wt.%Zn powder-3wt.%Al 2o 3powder; Zn powder median size is about 3 μm.By Zn powder and Al 2o 3after powder mixes, then B component is joined in component A (bonding base fluid) and prepare coating: the weight ratio of component A and B component is 1: 2.7.B component is joined after stirring in component A and can apply, containing Al 2o 3the priming paint wear resistance of particle is not more containing Al 2o 3the wear resistance of particle priming paint improves 3 times.
Example four
1. to prepare 500ml, modulus be 5 A base fluid (potassium silicate base fluid) prepare base fluid:
The KOH solution of raw material: 3mol/L; The silicon sol of solid content 30%; Silane coupling agent; Deionized water.
Preparation: getting 200ml concentration is that the KOH solution of 3mol/L is poured in measuring cup, is slowly joined in KOH solution by 300g silicon sol, adds temperature and control at 85 DEG C, stirring velocity 200 turns/min.After silicon sol dropwises, about reducing temperature to 40 DEG C, slowly add 2wt.% solution weight silane coupling agent.After silane coupling agent adds, continue stirring at normal temperature 1-2 hour, make solution full and uniform.Add the deionized water of 500ml, make solid content be about 20%.The modulus of prepared base fluid is 5, and pH value is 10.5.This is component A.
2. B component (Zn powder) is joined in component A (bonding base fluid) and prepare coating: B component is made up of Zn powder, ZnO powder and solubility latex, Zn powder mass content 96%, Zn powder median size is 3 μm, ZnO powder mass content 2%, solubility latex mass content 2%; The weight ratio of component A and B component is 1: 3.B component is joined after stirring in component A and can apply.After being added with ZnO powder and solubility latex, the water tolerance of coating improves 3-5 doubly, and snappiness is doubled.

Claims (2)

1. the preparation method of a water-based inorganic two-component coating, this coating by by the component A prepared and B component with 1: 2-4 weight ratio mix and make, wherein component A is bonding base fluid, B component is pigment, B component is made up of Zn powder, ZnO powder and EVA redispersible polymer, wherein Zn powder mass content is 90-95%, ZnO powder mass content is 1-5%, EVA redispersible polymer mass content is 1-5%, and the preparation process that it is characterized by described component A comprises the steps:
1) in the KOH solution of 2-4mol/L, slowly add silicon sol, add temperature and control at 60-85 DEG C, stirring velocity 200-400 rev/min,
2) after silicon sol dropwises, reduce temperature to 40 DEG C, slowly add total solution weight than the silane coupling agent CH for 1-10% 3si (OCH 3) 3,
3), after silane coupling agent adds, continue stirring at normal temperature 1-2 hour, make solution full and uniform,
4) in step 3) after solution in add deionized water, the inorganic solid content weight percent making base fluid is 18-22%,
5) modulus of prepared base fluid is at 4.7-5.2, and pH value is at 10-11.
2. preparation method as claimed in claim 1, is characterized by step 4) after add total solution weight than the benzene emulsion for 1-10%.
CN201210103246.2A 2012-04-10 2012-04-10 Environment-friendly inorganic corrosion-resistant wearing-resistant composite coating and preparation method thereof Expired - Fee Related CN102604452B (en)

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