CN112852199B - Preparation method of cement-based steel structure protective coating - Google Patents

Preparation method of cement-based steel structure protective coating Download PDF

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CN112852199B
CN112852199B CN202110054172.7A CN202110054172A CN112852199B CN 112852199 B CN112852199 B CN 112852199B CN 202110054172 A CN202110054172 A CN 202110054172A CN 112852199 B CN112852199 B CN 112852199B
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water
magnesium sulfate
tartaric acid
acid solution
coating
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CN112852199A (en
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李军
魏锟
苏彩丽
邢晓飞
张莹莹
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Kaifeng University
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Kaifeng University
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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
    • C09D1/06—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances cement
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B9/00—Magnesium cements or similar cements
    • C04B9/04—Magnesium cements containing sulfates, nitrates, phosphates or fluorides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B9/00—Magnesium cements or similar cements
    • C04B9/11—Mixtures thereof with other inorganic cementitious materials
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Structural Engineering (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

The invention provides a preparation method of a cement-based steel structure protective coating. The raw materials of the coating comprise 75-85% of light-burned magnesia powder, 10-20% of magnesium sulfate and 1-5% of acid solution. The present invention uses light burned magnesia and magnesium sulfate as main material and makes them hydrated, and in the presence of acid solution and disodium hydrogen phosphate the hydrated product and crystal appearance of basic magnesium sulfate cement are improved, and its structure is more compact and weather resistance is better. The detection shows that after the water of the coating is evaporated, hydration products are mutually staggered and overlapped to form a continuous network structure, the crystal structure is more compact, the content of needle-shaped crystals is increased, the structure density is higher, an expansion layer with excellent performance is formed, and a stable and long-term anticorrosion effect is achieved; the hardness, adhesive force, strength and other properties of the obtained coating are obviously improved; the paint has the characteristics of controllable setting time, quick hardening, normal-temperature curing, low cost and the like, and has strong adhesive force to a steel structure matrix, high mechanical strength, excellent and stable corrosion resistance and good durability.

Description

Preparation method of cement-based steel structure protective coating
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a preparation method of a cement-based steel structure protective coating.
Background
The steel structure has high strength, good specific strength and good earthquake resistance, and is widely applied to high-rise buildings, large-span structures, light structures and the like. Meanwhile, the steel structure is easy to machine and form, convenient to install and disassemble, and the steel structure is also multipurpose for large-scale plants. However, the steel structure is easy to rust in a humid environment, particularly a corrosive environment, and the service life is reduced. Therefore, the problem of corrosion prevention of steel structures with wide application is always a hotspot problem in the field, and the surface coating of the steel structures is a common corrosion prevention mode.
At present, steel structure protective coating commonly used is mostly organic coating, and organic protective coating coats effectually, and self does not receive the erosion in corrosive environment, but organic coating is very easily ageing, and the life of self is far less than the life of steel construction, can't provide long-term effectual protection to the steel construction. Although the inorganic coating overcomes the defect that the organic coating is easy to age, the coating effect is good, but the bonding effect of the inorganic coating and a steel structure is poor, and the coating is easy to delaminate. The steel structure factory building has more and more problems of repair due to the fact that the surface coating is not firmly bonded and poor in rust prevention and corrosion prevention performance, and a large amount of loss is caused to the society and the environment. With the gradual expansion of the application range of steel structures and the increasingly outstanding environmental problems, the requirements on the steel structure anticorrosive paint are more and more strict. Therefore, the development and research of anticorrosive coatings with outstanding bonding performance, multiple functions, environmental protection and long service life is a necessary trend for solving the problems in the field.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of a cement-based steel structure protective coating. The paint has the characteristics of controllable setting time, quick hardening, normal-temperature curing, low cost and the like, and has strong adhesive force to a steel structure matrix, high mechanical strength, excellent and stable corrosion resistance and good durability.
The invention provides a preparation method of a cement-based steel structure protective coating, which comprises the steps of mixing light-burned magnesium oxide, magnesium sulfate and an acid solution containing tartaric acid to obtain a mixture, and adding water for mixing and stirring.
Further, the tartaric acid-containing acid solution is an aqueous solution, wherein the mass ratio of tartaric acid to water is 1.35-1.45: 1.
further, the tartaric acid-containing acid solution also comprises acetic acid.
Further, the tartaric acid-containing acid solution is an aqueous solution, and the mass ratio of tartaric acid, acetic acid and water in the tartaric acid-containing acid solution is 1: 1: 1.
further, when the total weight of the light-burned magnesia powder, the magnesium sulfate and the acid solution containing tartaric acid is 100%, the mass percentages of the materials are as follows: 75-85% of light-burned magnesia powder, 10-20% of magnesium sulfate and 1-5% of tartaric acid-containing acid solution.
Further, before the water is added, disodium hydrogen phosphate is pre-doped into the mixture, and the dosage of the disodium hydrogen phosphate is 10-15% of the total mass of the mixture.
Further, the content of the magnesium oxide in the light-burned magnesium oxide is more than or equal to 95 percent, and the specific surface area is 980m 2 /kg。
Further, the magnesium sulfate is magnesium sulfate heptahydrate.
Further, the mass percentage of the mixture to water is 70% -80%: 20 to 30 percent.
Further, the mixing and stirring by adding water specifically comprises the following steps:
mixing the mixture with water and uniformly stirring under the condition of 500-700r/min to obtain a slurry mixture;
the slurry mixture is stirred for 10-30 minutes under the condition of 1500-2000r/min to obtain the protective coating.
The invention also provides application of the protective coating in steel structure protection.
The cement-based steel structure protective coating prepared by the preparation method of the protective coating contains 5Mg (OH) 2 ·MgSO 4 ·7H 2 O (5.1.7) phase, Mg (OH) 2 A phase and an MgO phase.
The invention has the following positive and beneficial effects
The present invention uses light burned magnesia and magnesium sulfate as main material for hydration, and improves the hydration product and crystal appearance of basic magnesium sulfate cement in the presence of acid solution and disodium hydrogen phosphate. The detection result also shows that after the water of the coating is evaporated, hydration products are mutually staggered and overlapped to form a continuous network structure, the crystal structure is more compact, the content of needle-shaped crystals is increased, the structure density is higher, an expansion layer with excellent performance is formed, and a stable and long-term anticorrosion effect is achieved; the hardness of the obtained coating reaches 6.3H, the adhesive force reaches 5.2B, the strength reaches 1.5MPa, and the performance is obviously improved;
the softening coefficient of the coating obtained by the invention can reach 0.98 after 240 days of soaking water, and the hydration speed of MgO in water is obviously delayed; in the prior art, the magnesium oxysulfate cement paste test piece cracks after being soaked in water for 28 days, and MgO is hydrated to generate crystallization stress to destroy the cement structure;
the invention obviously improves the performance of the coating without additional additives (reduces the production cost), and creatively solves the technical problems of the steel structure protective coating in the field.
Drawings
FIG. 1 is an XRD pattern of a 28-day cured basic Magnesium Sulfate Cement (MSC) neat paste hardened mass; FIG. 1(a) shows an XRD pattern of a coating prepared without glacial acetic acid and disodium hydrogen phosphate; FIG. 1(b) is an XRD pattern of a coating doped with glacial acetic acid and disodium hydrogen phosphate.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments for understanding the technical solutions of the present invention, but the present invention is not limited to the scope of the present invention.
The content by mass of magnesium oxide in the lightly calcined magnesium oxide used in the following examples was 95% or more, and the specific surface area was 980m 2 (iv) kg; the mass ratio of tartaric acid to water in the tartaric acid-containing acid solution is 1.4: 1; the mass ratio of tartaric acid, acetic acid and water in the acid solution of tartaric acid and acetic acid is 1: 1: 1.
example 1
The invention provides a cement-based steel structure protective coating which is prepared from the following raw materials: 75% of light-burned magnesia powder, 20% of magnesium sulfate heptahydrate and 5% of acid solution of tartaric acid and acetic acid; disodium hydrogen phosphate accounting for 15% of the total weight of the mixture; and (3) water.
The preparation method of the cement-based steel structure protective coating comprises the following steps:
(1) adding light-burned magnesia powder, magnesium sulfate heptahydrate, acid solution of tartaric acid and acetic acid and disodium hydrogen phosphate into a stirrer according to the required weight ratio, and mixing to obtain a mixture;
(2) adding water into the mixture obtained in the step (1), stirring for 3-5 minutes under the condition of 500-700r/min, and uniformly stirring to obtain a slurry mixture; wherein the mass percentage of the mixture to the water is 70%: 30 percent;
(3) and (3) stirring the slurry mixture obtained in the step (2) for 10 minutes under the condition of 1500-2000r/min to obtain the protective coating.
The determination shows that the water resistance of the coating obtained in the embodiment is further improved, the softening coefficient of the foam water 240d can reach 0.98, and the hydration speed of MgO in water is reduced.
Tests show that the basic magnesium sulfate cement coating has the hardness of 6.3H, the adhesive force of 5.2B and the strength of 1.5 MPa.
And painting the prepared coating slurry on the surface of a steel structure, evaporating and drying water, and forming a protective coating with the thickness of 2-5mm by using the protective coating. The coating has the advantages of strong adhesive property and high durability.
Example 2
The invention provides a protective coating for a cement-based steel structure, which is prepared from the following raw materials: 80% of light-burned magnesia powder, 17% of magnesium sulfate heptahydrate and 3% of acid solution of tartaric acid and acetic acid; disodium hydrogen phosphate accounting for 12 percent of the total weight of the mixture; and (3) water.
The preparation method of the cement-based steel structure protective coating comprises the following steps:
(1) adding light-burned magnesia powder, magnesium sulfate heptahydrate, acid solution of tartaric acid and acetic acid and disodium hydrogen phosphate into a stirrer according to the required weight ratio, and mixing to obtain a mixture;
(2) adding water into the mixture obtained in the step (1), stirring for 3-5 minutes under the condition of 500-700r/min, and uniformly stirring to obtain a slurry mixture; wherein the mass percentage of the mixture to the water is 75%: 25 percent;
(3) and (3) stirring the slurry mixture obtained in the step (2) for 20 minutes under the condition of 1500-2000r/min to obtain the protective coating.
The determination shows that the water resistance of the coating obtained in the embodiment is further improved, the softening coefficient of the foam water 240d can reach 0.98, and the hydration speed of MgO in water is reduced.
Tests show that the basic magnesium sulfate cement coating has the hardness of 6.1H, the adhesive force of 5.1B and the strength of 1.5 MPa.
And (3) painting the prepared coating slurry on the surface of a steel structure, and evaporating and drying water to form a protective coating with the thickness of 2-5 mm. The coating has the advantages of strong adhesive property and high durability.
Example 3
The invention provides a cement-based steel structure protective coating which is prepared from the following raw materials: 85% of light-burned magnesia powder, 14% of magnesium sulfate heptahydrate and 1% of acid solution of tartaric acid and acetic acid; disodium hydrogen phosphate accounting for 10 percent of the total weight of the mixture; and (3) water.
The preparation method of the cement-based steel structure protective coating comprises the following steps:
(1) adding light-burned magnesia powder, magnesium sulfate heptahydrate, acid solution of tartaric acid and acetic acid and disodium hydrogen phosphate into a stirrer according to the required weight ratio, and mixing to obtain a mixture;
(2) adding water into the mixture obtained in the step (1), stirring for 3-5 minutes under the condition of 500-700r/min, and uniformly stirring to obtain a slurry mixture; wherein the mass percentage of the mixture to the water is 80%: 20 percent;
(3) and (3) stirring the slurry mixture in the step (2) for 30 minutes under the condition of 1500-2000r/min to obtain the protective coating.
The determination shows that the water resistance of the coating obtained in the embodiment is further improved, the softening coefficient of the foam water 240d can reach 0.98, and the hydration speed of MgO in water is reduced.
Tests show that the basic magnesium sulfate cement coating has the hardness of 6.0H, the adhesive force of 5.0B and the strength of 1.5 MPa.
And (3) painting the prepared coating slurry on the surface of a steel structure, and evaporating and drying water to form a protective coating with the thickness of 2-5 mm. The coating has the advantages of strong adhesive property and high durability.
Example 4
The invention provides a protective coating for a cement-based steel structure, which is prepared from the following raw materials: 75% of light-burned magnesia powder, 20% of magnesium sulfate heptahydrate and 5% of tartaric acid-containing acid solution; and (3) water.
The preparation method of the cement-based steel structure protective coating comprises the following steps:
(1) adding light-burned magnesia powder, magnesium sulfate heptahydrate and acid solution containing tartaric acid into a stirrer according to the required weight ratio, and mixing to obtain a mixture;
(2) adding water into the mixture obtained in the step (1), stirring for 3-5 minutes under the condition of 500-700r/min, and uniformly stirring to obtain a slurry mixture; wherein the mass percentage of the mixture to the water is 70%: 30 percent;
(3) and (3) stirring the slurry mixture obtained in the step (2) for 10 minutes under the condition of 1500-2000r/min to obtain the protective coating.
Tests show that the water resistance of the paint obtained by adding the water-soluble polyurethane coating is further improved, and the 240d softening coefficient of the foam water can reach (0.75). The hydration speed of MgO in water is reduced.
Tests show that the hardness of the coating is (3.2H), the adhesion is (2.1B) and the strength reaches (0.4) MPa.
And (3) painting the prepared coating slurry on the surface of a steel structure, and evaporating and drying water to form a protective coating with the thickness of 1-2 mm. Substantially meets the requirements of the coating.
Example 5
The invention provides a protective coating for a cement-based steel structure, which is prepared from the following raw materials: 85% of light-burned magnesia powder, 14% of magnesium sulfate heptahydrate and 1% of tartaric acid-containing acid solution; and (3) water.
The preparation method of the cement-based steel structure protective coating comprises the following steps:
(1) adding light-burned magnesia powder, magnesium sulfate heptahydrate and acid solution containing tartaric acid into a stirrer according to the required weight ratio, and mixing to obtain a mixture;
(2) adding water into the mixture obtained in the step (1), stirring for 3-5 minutes under the condition of 500-700r/min, and uniformly stirring to obtain a slurry mixture; wherein the mass percentage of the mixture to the water is 80%: 20 percent;
(3) and (3) stirring the slurry mixture in the step (2) for 30 minutes under the condition of 1500-2000r/min to obtain the protective coating.
Tests show that the water resistance of the paint obtained by adding the water-soluble polyurethane paint is further improved, and the softening coefficient of the foam water 240d can reach (0.75). The hydration speed of MgO in water is reduced.
Tests show that the hardness of the coating is (3.0H), the adhesion is (2.0B), and the strength reaches (0.4) MPa.
And (3) painting the prepared coating slurry on the surface of a steel structure, and evaporating and drying water to form a protective coating with the thickness of 1-2 mm. Substantially meets the requirements of the coating.
XRD detection is carried out on the coating prepared above, and the result is shown in figure 1: curve (a) is the XRD pattern of cured MSC paste without glacial acetic acid and disodium hydrogen phosphate for 28d under standard conditions (example 4), and curve (b) is the XRD pattern of cured MSC paste with glacial acetic acid and disodium hydrogen phosphate for 28d under standard conditions (example 1).
As can be seen from FIG. 1, the diffraction peak of MgO in the XRD pattern is very strong, indicating the presence of a large amount of unhydrated MgO. As can be seen by comparison, after adding glacial acetic acid and disodium hydrogen phosphate, the map (b) shows that MgO and Na are removed 2 HPO 4 、5Mg(OH) 2 ·MgSO 4 ·7H 2 The new product C is present in addition to the diffraction peak of O (5, 1, 7) 4 H 6 O 3 NaMg·4H 2 Diffraction peak of O (sodium magnesium acetate).

Claims (5)

1. A preparation method of cement-based steel structure protective coating comprises the steps of mixing light-burned magnesium oxide, magnesium sulfate, tartaric acid-containing acid solution and disodium hydrogen phosphate to obtain a mixture, adding water, mixing and stirring;
the tartaric acid-containing acid solution is an aqueous solution, the tartaric acid-containing acid solution comprises tartaric acid, acetic acid and water, and the mass ratio of tartaric acid to acetic acid to water in the tartaric acid-containing acid solution is 1: 1: 1;
the total weight of the light-burned magnesia powder, the magnesium sulfate and the acid solution containing tartaric acid is 100%, and the mass percentages of the materials are as follows: 75-85% of light-burned magnesia powder, 10-20% of magnesium sulfate and 1-5% of tartaric acid-containing acid solution;
the dosage of the disodium hydrogen phosphate is 10-15% of the total mass of the light calcined magnesia, the magnesium sulfate and the acid solution containing tartaric acid.
2. The method according to claim 1, wherein the lightly calcined magnesium oxide is produced by calcining magnesium oxideThe content of medium magnesium oxide is more than or equal to 95 percent, and the specific surface area is 980m 2 /kg。
3. The method of claim 1, wherein the magnesium sulfate is magnesium sulfate heptahydrate.
4. The preparation method according to claim 1, wherein the mass percentage of the mixture to the water is 70% -80%: 20 to 30 percent.
5. The method for preparing a compound according to any one of claims 1 to 4, wherein the mixing with water comprises the following steps:
the mixture is mixed with water and is uniformly stirred under the condition of 500-700r/min to obtain a slurry mixture;
the slurry mixture is stirred for 10-30 minutes under the condition of 1500-2000r/min to obtain the protective coating.
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CN109133841B (en) * 2018-09-20 2021-10-01 辽宁科技大学 Magnesium oxysulfate cement-based fireproof coating, preparation and construction method
CN109704604A (en) * 2019-02-25 2019-05-03 北京科技大学 A kind of modified magnesium oxysulfide concrete and preparation method thereof
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