CN115926624B - Corrosion-resistant expansion type water-based steel structure fireproof coating and preparation method and application thereof - Google Patents
Corrosion-resistant expansion type water-based steel structure fireproof coating and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a corrosion-resistant expansion type water-based steel structure fireproof coating, and a preparation method and application thereof. The corrosion-resistant expansion type water-based steel structure fireproof coating comprises the following components in parts by weight: 40-60 parts of aqueous hyperbranched acrylic resin, 30-50 parts of flame retardant, 0.1-5 parts of auxiliary agent, 5-10 parts of modified filler and 20-30 parts of water. The preparation method comprises the following steps: (1) Weighing materials comprising water-based hyperbranched acrylic resin, flame retardant, modified filler, auxiliary agent and water according to parts by weight, and mixing to obtain a mixed material; (2) And (3) continuously stirring the mixed materials in a high-speed stirrer at the temperature of 60-70 ℃ and the rotating speed of 2500-3500 rpm for 30-60 minutes to obtain the corrosion-resistant expansion type water-based steel structure fireproof coating. The invention is used for the corrosion prevention and fire protection of the steel structure of the industrial factory building, has longer fire resistance aging and better corrosion resistance, and meets the use requirement of C4-C5 corrosion environment (ISO 12944:2017).
Description
Technical Field
The invention relates to a coating technology for corrosion and fire protection of industrial factory building steel structures, in particular to a corrosion-resistant expansion type water-based steel structure fireproof coating applied to C4-C5 corrosion environments (ISO 12944:2017), and a preparation method and application thereof.
Background
When a fire disaster occurs, the temperature of the steel structure of the building is heated up, the strength of the steel structure is reduced, and when the temperature of the steel structure reaches 600 ℃, the strength of the steel structure is reduced to 30% of the strength of the steel structure under the normal temperature condition. At this point, the building structure collapses, causing greater losses. And the steel structure in the C4-C5 corrosion environment is corroded along with the corrosion, the protective coating is damaged, the steel structure is corroded, the strength of the steel structure is reduced, and the collapse speed of the steel structure in the environment is faster once a fire disaster occurs.
The corrosion-resistant fireproof paint applied to the surface of the steel structure in the C4-C5 corrosion environment (ISO 12944:2017) is mainly an expansion type fireproof paint. When a fire disaster occurs, the steel structure is subjected to fire, the expansion type fireproof coating can expand by tens times on the surface of the steel structure to form a hard heat insulation layer, the heating degree of the surface of the steel structure is reduced, the deformation time of the steel structure is further prolonged, the collapse starting time of a building is ensured not to collapse or after the building is delayed, and time is created for safe evacuation of personnel. However, most of the existing corrosion-resistant expansion type steel structure fireproof coatings are solvent type acrylic resin fireproof coatings, the environment friendliness is poor, and the adopted water-based expansion type fireproof coatings are good in environment friendliness, but have the problem of insufficient corrosion resistance, and cannot meet the corrosion requirements under the environment of C4-C5 (ISO 12944:2017), so that the required long-acting corrosion resistance cannot be achieved. Meanwhile, how to improve the heat resistance and the fire resistance of the expansion type fireproof coating is also a problem to be solved.
Disclosure of Invention
The water-based fireproof paint is mainly used for fireproof and corrosion prevention of industrial factory building steel structures, particularly coastal building steel structures, corrosion environment industrial factory building steel structures, large-scale indoor swimming pool steel structures and the like, so as to meet the use requirements under C4-C5 corrosion environments (ISO 12944:2017). In order to achieve the purpose of use, the silicon-containing hyperbranched acrylic resin is obtained through a specific preparation method, so that not only is the cohesiveness of the fireproof coating improved, but also the corrosion resistance, fire resistance and weather resistance of the coating are improved, and the comprehensive use performance is excellent.
Based on the above, in a first aspect, the invention provides a corrosion-resistant expansion type water-based steel structure fireproof coating, which comprises the following components in parts by weight: 40-60 parts of aqueous hyperbranched acrylic resin, 30-50 parts of flame retardant, 0.1-5 parts of auxiliary agent, 5-10 parts of modified filler and 20-30 parts of water.
Optionally, the flame retardant comprises a carbon forming agent, a dehydration carbon forming catalyst and a foaming agent, wherein the mass ratio of the carbon forming agent to the dehydration carbon forming catalyst to the foaming agent is 1:3:3; wherein the carbon forming agent is pentaerythritol; the dehydration carbon-forming catalyst is ammonium polyphosphate or diammonium phosphate; the foaming agent is one or a combination of melamine, dicyandiamide, chlorinated paraffin and ammonium polyphosphate.
Optionally, the adjuvant comprises one or a combination of a dispersant, a film-forming adjuvant, and a defoamer; the dispersing agent is one or a combination of sodium hexametaphosphate, polyacrylic acid and sodium oleate; the film forming auxiliary agent is one or a combination of dodecyl alcohol ester, propylene glycol butyl ether and dipropylene glycol methyl ether; the defoaming agent is one or a combination of polydimethylsiloxane and polyoxypropylene glycerol ether.
Optionally, the preparation method of the modified filler comprises the following steps: (1) Dissolving a silane coupling agent in absolute ethyl alcohol to prepare a solution with the mass concentration of 30-50%; (2) Spraying the solution on the filler in a high-speed stirrer, uniformly stirring at a high speed, drying in a blast drying oven at 95-105 ℃ for 2-5h, and naturally cooling to obtain modified filler; the filler is one or a combination of barium sulfate, titanium dioxide, calcium carbonate and white carbon black.
Optionally, the silane coupling agent is one or a combination of gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri (beta-methoxyethoxy) silane).
Optionally, the preparation method of the aqueous hyperbranched acrylic resin comprises the following steps: (1) Sequentially adding toluene solution of maleic anhydride with the molar concentration of 1-3mol/L into a reaction kettle with a reflux device under the protection of inert gas, adding tetrachlorosilane at room temperature, dropwise adding deionized water under the stirring state, reacting for 0.5-1h at normal temperature, heating to 90-100 ℃ for reacting for 2-4h, and keeping reflux to obtain a pre-reaction solution; wherein the molar ratio of maleic anhydride, tetrachlorosilane and deionized water is 4:1-2:4, a step of; (2) Adding hydroxyethyl acrylate into the pre-reaction liquid, controlling the temperature of a reaction kettle within the range of 50-70 ℃, adding benzoyl peroxide after reacting for 3-4 hours, keeping the temperature at 85-90 ℃, and continuing to react for 2-3 hours to obtain a polymerization liquid; wherein the mol ratio of the hydroxyethyl acrylate, benzoyl peroxide and tetrachlorosilane is 4-8:0.1-0.6:1; (3) And (3) removing the reflux device, maintaining the temperature at 100-115 ℃, removing and recovering the toluene solvent, washing with deionized water, filtering and drying to obtain the water-based hyperbranched acrylic resin.
In a second aspect, the invention provides a method for preparing the corrosion-resistant intumescent water-based steel structure fireproof paint, which comprises the following steps: (1) Weighing materials comprising water-based hyperbranched acrylic resin, flame retardant, modified filler, auxiliary agent and water according to parts by weight, and mixing to obtain a mixed material; (2) And (3) continuously stirring the mixed materials in a high-speed stirrer at the temperature of 60-70 ℃ and the rotating speed of 2500-3500 rpm for 30-60 minutes to obtain the corrosion-resistant expansion type water-based steel structure fireproof coating.
In a third aspect, the invention provides the application of the corrosion-resistant expansion type water-based steel structure fireproof paint for corrosion prevention and fireproof protection of industrial factory building steel structures, wherein the industrial factory building steel structures are one of coastal building steel structures, corrosion environment industrial factory building steel structures and large-scale indoor swimming pool steel structures.
The beneficial effects of the invention are as follows:
1. the water-based hyperbranched acrylic resin is prepared by mixing silicon tetrachloride and maleic anhydride, then carrying out hydrolysis and polycondensation under the heating condition, grafting a single carboxyl of maleic acid to a silicon atom instead of a chlorine atom, condensing a hydroxyl of subsequently added hydroxyethyl acrylate with the other carboxyl of maleic acid to obtain a silicon branching intermediate, adding an initiator, and further carrying out prepolymerization reaction on the hydroxyethyl acrylate and the silicon branching intermediate to generate the water-based hyperbranched acrylic resin; the aqueous hyperbranched acrylic resin has three-dimensional double bond active functional groups and silicon atoms, has low molecular steric hindrance and low viscosity, can improve the reaction uniformity and the reaction activity of the coating, and can more effectively form three-dimensional package flame retardants and other fillers, and the space of the whole system is uniform and more distributed; meanwhile, the water-based hyperbranched acrylic resin has the advantages that the active end hydroxyl groups are used, the attaching effect of the fireproof coating and the steel structure is stronger, the fireproof aging is prolonged, and the ageing resistance and the corrosion resistance are better.
2. When a fire disaster occurs, the temperature is increased, the softening point of the silicon-containing hyperbranched acrylic resin is increased, the silicon-containing hyperbranched acrylic resin is reasonably matched with a flame retardant system, the effects of foaming, dehydration and char formation are facilitated, the whole expansion of the coating is compact and uniform, the internal structure is a regular honeycomb carbon layer, the foaming multiplying power is high, the flame retardant and heat insulation effects are obviously improved, and the heating temperature rise of the steel structure is protected.
3. The adopted flame retardant system is a phosphorus-nitrogen system, and can not generate toxic and harmful substances when heated, so that the fire can not cause injury to people due to the fireproof paint in the fire process.
Detailed Description
The following detailed description of the present invention will provide further details in order to make the above-mentioned objects, features and advantages of the present invention more comprehensible.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
First, a corrosion-resistant intumescent aqueous steel structure fire-retardant coating according to a first aspect of the invention is described, comprising, in parts by weight: 40-60 parts of aqueous hyperbranched acrylic resin, 30-50 parts of flame retardant, 0.1-5 parts of auxiliary agent, 5-10 parts of modified filler and 20-30 parts of water.
In the corrosion-resistant intumescent water-based steel structure fireproof coating according to the first aspect of the invention, the flame retardant comprises a carbon forming agent, a dehydration carbon forming catalyst and a foaming agent, and the mass ratio is 1:3:3; wherein the carbon forming agent is pentaerythritol; the dehydration carbon-forming catalyst is ammonium polyphosphate or diammonium phosphate; the foaming agent is one or a combination of melamine, dicyandiamide, chlorinated paraffin and ammonium polyphosphate.
In the corrosion-resistant intumescent aqueous steel structure fire-retardant coating according to the first aspect of the invention, the auxiliary comprises one or a combination of a dispersant, a film-forming auxiliary and a defoamer; the dispersing agent is one or a combination of sodium hexametaphosphate, polyacrylic acid and sodium oleate; the film forming auxiliary agent is one or a combination of dodecyl alcohol ester, propylene glycol butyl ether and dipropylene glycol methyl ether; the defoaming agent is one or a combination of polydimethylsiloxane and polyoxypropylene glycerol ether.
In the corrosion-resistant intumescent aqueous steel structure fire retardant coating according to the first aspect of the invention, the method for preparing the modified filler may comprise the steps of: (1) Dissolving a silane coupling agent in absolute ethyl alcohol to prepare a solution with the mass concentration of 30-50%; (2) Spraying the solution on the filler in a high-speed stirrer, uniformly stirring at a high speed, drying in a blast drying oven at 95-105 ℃ for 2-5h, and naturally cooling to obtain modified filler; the filler is one or a combination of barium sulfate, titanium dioxide, calcium carbonate and white carbon black.
In the corrosion and expansion resistant water-based steel structure fireproof coating according to the first aspect of the invention, the silane coupling agent is one or a combination of gamma-methacryloxypropyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane and vinyl tri (beta-methoxyethoxy) silane).
In the corrosion-resistant intumescent aqueous steel structure fire retardant coating according to the first aspect of the invention, the preparation method of the aqueous hyperbranched acrylic resin may comprise the following steps: (1) Sequentially adding toluene solution of maleic anhydride with the molar concentration of 1-3mol/L into a reaction kettle with a reflux device under the protection of inert gas, adding tetrachlorosilane at room temperature, dropwise adding deionized water under the stirring state, reacting for 0.5-1h at normal temperature, heating to 90-100 ℃ for reacting for 2-4h, and keeping reflux to obtain a pre-reaction solution; wherein the molar ratio of maleic anhydride, tetrachlorosilane and deionized water is 4:1-2:4, a step of; (2) Adding hydroxyethyl acrylate into the pre-reaction liquid, controlling the temperature of a reaction kettle within the range of 50-70 ℃, adding benzoyl peroxide after reacting for 3-4 hours, keeping the temperature at 85-90 ℃, and continuing to react for 2-3 hours to obtain a polymerization liquid; wherein the mol ratio of the hydroxyethyl acrylate, benzoyl peroxide and tetrachlorosilane is 4-8:0.1-0.6:1; (3) And (3) removing the reflux device, maintaining the temperature at 100-115 ℃, removing and recovering the toluene solvent, washing with deionized water, filtering and drying to obtain the water-based hyperbranched acrylic resin.
Next, a method for preparing the corrosion-resistant intumescent aqueous steel structure fire-retardant coating according to the second aspect of the invention is described, which may include the steps of: (1) Weighing materials comprising water-based hyperbranched acrylic resin, flame retardant, modified filler, auxiliary agent and water according to parts by weight, and mixing to obtain a mixed material; (2) And (3) continuously stirring the mixed materials in a high-speed stirrer at the temperature of 60-70 ℃ and the rotating speed of 2500-3500 rpm for 30-60 minutes to obtain the corrosion-resistant expansion type water-based steel structure fireproof coating.
Finally, the use of the corrosion-resistant intumescent water-based steel structure fireproof coating according to the third aspect of the invention is described, wherein the corrosion-resistant intumescent water-based steel structure fireproof coating according to the invention can be used for the corrosion-resistant fireproof protection of industrial factory building steel structures, one of coastal building steel structures, industrial factory building steel structures with corrosive environment and large indoor swimming pool steel structures.
The preparation method of the present invention will be described below:
(one) preparation of aqueous hyperbranched acrylic resin
(1) Sequentially adding toluene solution of maleic anhydride with the molar concentration of 1-3mol/L into a reaction kettle with a reflux device under the protection of inert gas, adding tetrachlorosilane at room temperature, dropwise adding deionized water under the stirring state, heating to 90-100 ℃ for reaction for 2-4 hours, and keeping reflux to obtain a pre-reaction solution; wherein the molar ratio of maleic anhydride, tetrachlorosilane and deionized water is 4:1-2:4, a step of;
(2) Adding hydroxyethyl acrylate into the pre-reaction liquid, controlling the temperature of a reaction kettle within the range of 50-70 ℃, adding benzoyl peroxide after reacting for 3-4 hours, keeping the temperature at 85-90 ℃, and continuing to react for 2-3 hours to obtain a polymerization liquid; wherein the mol ratio of the hydroxyethyl acrylate, benzoyl peroxide and tetrachlorosilane is 4-8:0.1-0.6:1;
(3) And (3) removing the reflux device, maintaining the temperature at 100-115 ℃, removing and recovering the toluene solvent, washing with deionized water, filtering and drying to obtain the water-based hyperbranched acrylic resin.
(II) Filler modification
(1) Dissolving a silane coupling agent in absolute ethyl alcohol to prepare a solution with the mass concentration of 30-50%;
(2) Spraying the solution on the filler in a high-speed stirrer, uniformly stirring at a high speed, drying in a blast drying oven at 100-105 ℃ for 2-5h, and naturally cooling to obtain modified filler; the filler is one or a combination of barium sulfate, titanium dioxide, calcium carbonate and white carbon black; the silane coupling agent is one or a combination of gamma-methacryloxypropyl trimethoxy silane, vinyl triethoxy silane, vinyl trimethoxy silane and vinyl tri (beta-methoxyethoxy) silane.
(III) preparing the water-based fireproof paint
(1) Weighing 40-60 parts of material water-based hyperbranched acrylic resin, 30-50 parts of flame retardant, 0.1-5 parts of auxiliary agent, 5-10 parts of modified filler and 20-30 parts of deionized water according to parts by weight, and mixing to obtain a mixed material; wherein the flame retardant consists of a carbon forming agent, a dehydration carbon forming catalyst and a foaming agent, and the mass ratio is 1:3:3; wherein the carbon forming agent is pentaerythritol; the dehydration carbon-forming catalyst is ammonium polyphosphate or diammonium phosphate; the foaming agent is one or a combination of melamine, dicyandiamide, chlorinated paraffin or ammonium polyphosphate; the auxiliary agent consists of a dispersing agent, a film forming auxiliary agent and a defoaming agent, and the mass ratio is 1:2:1, a step of; the dispersing agent is one or a combination of sodium hexametaphosphate, polyacrylic acid and sodium oleate; the film forming auxiliary agent is one or a combination of dodecyl alcohol ester, propylene glycol butyl ether and dipropylene glycol methyl ether; the defoaming agent is one or a combination of polydimethylsiloxane and polyoxypropylene glycerol ether;
(2) And (3) continuously stirring the mixed materials in a high-speed stirrer at the temperature of 60-70 ℃ and the rotating speed of 2500-3500 r/min for 30-60 min to obtain the water-based fireproof coating for fireproof and corrosion prevention of the steel structure.
The corrosion-resistant intumescent water-based steel structure fireproof paint and the preparation method thereof are specifically described below with reference to specific examples.
The main raw materials and equipment used are as follows: the raw materials and equipment of each example and comparative example were the same, unless indicated otherwise; the materials of specific model or kind are not indicated, and are derived from common same model purchased in the market, and are not particularly limited.
Example 1
(one) preparation of aqueous hyperbranched acrylic resin
(1) Sequentially adding toluene solution of maleic anhydride with the molar concentration of 1mol/L into a reaction kettle with a reflux device under the protection of inert gas, adding tetrachlorosilane at room temperature, dropwise adding deionized water in a stirring state, heating to 90 ℃ for reaction for 2 hours, and keeping reflux to obtain a pre-reaction liquid; wherein the molar ratio of maleic anhydride, tetrachlorosilane and deionized water is 4:1:4;
(2) Adding hydroxyethyl acrylate into the pre-reaction liquid, controlling the temperature of a reaction kettle within a range of 50 ℃, adding benzoyl peroxide after reacting for 3 hours, keeping the temperature at 85 ℃, and continuing to react for 2 hours to obtain a polymerization liquid; wherein the mol ratio of the hydroxyethyl acrylate, the benzoyl peroxide and the tetrachlorosilane is 4:0.1:1;
(3) And (3) removing the reflux device, maintaining the temperature at 100 ℃, removing and recovering the toluene solvent, washing with deionized water, filtering and drying to obtain the water-based hyperbranched acrylic resin.
(II) Filler modification
(1) Dissolving vinyl triethoxysilane in absolute ethyl alcohol to prepare a solution with the mass concentration of 30%;
(2) Spraying the solution on the filler in a high-speed stirrer, stirring uniformly at a high speed, drying for 2 hours at 100 ℃ in a blast drying box, and naturally cooling to obtain the modified barium sulfate.
(III) preparing the water-based fireproof paint
(1) Weighing 40 parts of material water-based hyperbranched acrylic resin, 30 parts of flame retardant, 0.1 part of auxiliary agent, 5 parts of modified barium sulfate and 20 parts of deionized water according to parts by weight, and mixing to obtain a mixed material; wherein the flame retardant consists of pentaerythritol, ammonium polyphosphate and dicyandiamide, and the mass ratio is 1:3:3; the auxiliary agent consists of sodium hexametaphosphate, propylene glycol butyl ether and polyoxypropylene glycerol ether, and the mass ratio is 1:2:1;
(2) And (3) the mixed materials are stirred for 30 minutes in a high-speed stirrer at the temperature of 60 ℃ at the rotating speed of 2500 rpm, so that the water-based fireproof coating is obtained and is used for fireproof and anticorrosion of a steel structure.
Example 2
(one) preparation of aqueous hyperbranched acrylic resin
(1) Sequentially adding toluene solution of maleic anhydride with the molar concentration of 3mol/L into a reaction kettle with a reflux device under the protection of inert gas, adding tetrachlorosilane at room temperature, dropwise adding deionized water in a stirring state, heating to 100 ℃ for reaction for 4 hours, and keeping reflux to obtain a pre-reaction liquid; wherein the molar ratio of maleic anhydride, tetrachlorosilane and deionized water is 2:1:2;
(2) Adding hydroxyethyl acrylate into the pre-reaction liquid, controlling the temperature of a reaction kettle within a range of 70 ℃, adding benzoyl peroxide after reacting for 4 hours, keeping the temperature at 90 ℃, and continuing to react for 3 hours to obtain a polymerization liquid; wherein the mol ratio of the hydroxyethyl acrylate, the benzoyl peroxide and the tetrachlorosilane is 8:0.6:1;
(3) And (3) removing the reflux device, maintaining the temperature at 115 ℃, removing and recovering the toluene solvent, washing with deionized water, filtering and drying to obtain the aqueous hyperbranched acrylic resin.
(II) Filler modification
(1) Dissolving vinyl tri (beta-methoxyethoxy) silane in absolute ethyl alcohol to prepare a solution with the mass concentration of 50%;
(2) Spraying the solution on the white carbon black in a high-speed stirrer, stirring uniformly at a high speed, drying for 5 hours at 105 ℃ in a blast drying oven, and naturally cooling to obtain the modified white carbon black.
(III) preparing the water-based fireproof paint
(1) Weighing 60 parts of material aqueous hyperbranched acrylic resin, 50 parts of flame retardant, 5 parts of auxiliary agent, 10 parts of modified white carbon black and 30 parts of deionized water according to parts by weight, and mixing to obtain a mixed material; wherein the flame retardant consists of pentaerythritol, diammonium phosphate and ammonium polyphosphate, and the mass ratio is 1:3:3; the auxiliary agent consists of polyacrylic acid, dipropylene glycol methyl ether and polyoxypropylene glycerol ether, and the mass ratio is 1:2:1;
(2) And (3) the mixed materials are stirred in a high-speed stirrer at the temperature of 70 ℃ at the rotating speed of 3500 r/min for 60 minutes, so that the water-based fireproof paint is obtained and is used for fireproof and anticorrosion of a steel structure.
Example 3
(one) preparation of aqueous hyperbranched acrylic resin
(1) Sequentially adding toluene solution of maleic anhydride with the molar concentration of 2mol/L into a reaction kettle with a reflux device under the protection of inert gas, adding tetrachlorosilane at room temperature, dropwise adding deionized water in a stirring state, heating to 95 ℃ for reaction for 3 hours, and keeping reflux to obtain a pre-reaction liquid; wherein the molar ratio of maleic anhydride, tetrachlorosilane and deionized water is 4:1.5:4;
(2) Adding hydroxyethyl acrylate into the pre-reaction liquid, controlling the temperature of a reaction kettle within a range of 60 ℃, adding benzoyl peroxide after reacting for 3.5 hours, keeping the temperature at 88 ℃, and continuing to react for 2.5 hours to obtain a polymerization liquid; wherein the mol ratio of the hydroxyethyl acrylate, the benzoyl peroxide and the tetrachlorosilane is 6:0.4:1;
(3) And (3) removing the reflux device, maintaining the temperature at 108 ℃, removing and recovering the toluene solvent, washing with deionized water, filtering and drying to obtain the water-based hyperbranched acrylic resin.
(II) Filler modification
(1) Dissolving gamma-methacryloxypropyl trimethoxy silane in absolute ethyl alcohol to prepare a solution with the mass concentration of 40%;
(2) Spraying the solution on the titanium dioxide in a high-speed stirrer, uniformly stirring at a high speed, drying for 3 hours at 102 ℃ in a blast drying oven, and naturally cooling to obtain the modified titanium dioxide.
(III) preparing the water-based fireproof paint
(1) Weighing 50 parts of material water-based hyperbranched acrylic resin, 40 parts of flame retardant, 2 parts of auxiliary agent, 8 parts of modified titanium dioxide and 25 parts of deionized water according to parts by weight, and mixing to obtain a mixed material; wherein the flame retardant consists of pentaerythritol, ammonium polyphosphate and melamine, and the mass ratio is 1:3:3; the auxiliary agent consists of sodium oleate, dodecanol ester and polydimethylsiloxane, and the mass ratio is 1:2:1;
(2) And (3) the mixed materials are placed in a high-speed stirrer, the temperature is controlled to be 65 ℃, the rotating speed is 3000 r/min, and stirring is continued for 45 min, so that the water-based fireproof paint is obtained and is used for fireproof and corrosion prevention of a steel structure.
Comparative example 1
The procedure of example 3 was repeated except that the aqueous hyperbranched acrylic resin was replaced with an acrylic resin.
Performance testing
The coatings obtained in example 3 and comparative example 1 above were subjected to performance tests with reference to the corresponding national and industry standards, the test results being given in the following table:
therefore, the silicon-containing hyperbranched acrylic resin prepared by the specific preparation method ensures that the coating has excellent corrosion resistance, weather resistance, fire resistance, cohesiveness and comprehensive performance.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (7)
1. The corrosion-resistant intumescent water-based steel structure fireproof coating is characterized by comprising the following components in parts by weight:
the preparation method of the aqueous hyperbranched acrylic resin comprises the following steps: (1) Sequentially adding toluene solution of maleic anhydride with the molar concentration of 1-3mol/L into a reaction kettle with a reflux device under the protection of inert gas, adding tetrachlorosilane at room temperature, dropwise adding deionized water under the stirring state, reacting for 0.5-1h at normal temperature, heating to 90-100 ℃ for reacting for 2-4h, and keeping reflux to obtain a pre-reaction solution; wherein the molar ratio of maleic anhydride, tetrachlorosilane and deionized water is 4:1-2:4, a step of; (2) Adding hydroxyethyl acrylate into the pre-reaction liquid, controlling the temperature of a reaction kettle within the range of 50-70 ℃, adding benzoyl peroxide after reacting for 3-4 hours, keeping the temperature at 85-90 ℃, and continuing to react for 2-3 hours to obtain a polymerization liquid; wherein the mol ratio of the hydroxyethyl acrylate, benzoyl peroxide and tetrachlorosilane is 4-8:0.1-0.6:1; (3) And (3) removing the reflux device, maintaining the temperature at 100-115 ℃, removing and recovering the toluene solvent, washing with deionized water, filtering and drying to obtain the water-based hyperbranched acrylic resin.
2. The corrosion-resistant intumescent aqueous steel structure fireproof coating according to claim 1, wherein the flame retardant comprises a carbon forming agent, a dehydration carbon forming catalyst and a foaming agent in a mass ratio of 1:3:3; wherein the carbon forming agent is pentaerythritol; the dehydration carbon-forming catalyst is ammonium polyphosphate or diammonium phosphate; the foaming agent is one or a combination of melamine, dicyandiamide, chlorinated paraffin and ammonium polyphosphate.
3. The corrosion-resistant intumescent aqueous steel structure fire retardant coating of claim 1 wherein the auxiliary comprises one or a combination of dispersants, film forming aids, and defoamers; the dispersing agent is one or a combination of sodium hexametaphosphate, polyacrylic acid and sodium oleate; the film forming auxiliary agent is one or a combination of dodecyl alcohol ester, propylene glycol butyl ether and dipropylene glycol methyl ether; the defoaming agent is one or a combination of polydimethylsiloxane and polyoxypropylene glycerol ether.
4. The corrosion-resistant intumescent aqueous steel structure fire retardant coating of claim 1 wherein said modified filler is prepared by a process comprising the steps of: (1) Dissolving a silane coupling agent in absolute ethyl alcohol to prepare a solution with the mass concentration of 30-50%; (2) Spraying the solution on the filler in a high-speed stirrer, uniformly stirring at a high speed, drying in a blast drying oven at 95-105 ℃ for 2-5h, and naturally cooling to obtain modified filler; the filler is one or a combination of barium sulfate, titanium dioxide, calcium carbonate and white carbon black.
5. The corrosion-resistant intumescent aqueous steel structure fire retardant coating according to claim 4, wherein said silane coupling agent is one or a combination of gamma-methacryloxypropyl trimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris (beta-methoxyethoxy) silane.
6. The method for preparing the corrosion-resistant intumescent aqueous steel structure fire retardant coating as claimed in any one of claims 1-5, comprising the steps of: (1) Weighing materials comprising water-based hyperbranched acrylic resin, flame retardant, modified filler, auxiliary agent and water according to parts by weight, and mixing to obtain a mixed material; (2) And (3) continuously stirring the mixed materials in a high-speed stirrer at the temperature of 60-70 ℃ and the rotating speed of 2500-3500 rpm for 30-60 minutes to obtain the corrosion-resistant expansion type water-based steel structure fireproof coating.
7. The use of the corrosion-resistant intumescent aqueous steel structure fire protection coating according to any one of claims 1-5, wherein the coating is used for corrosion protection and fire protection of industrial plant steel structures, wherein the industrial plant steel structures are one of coastal building steel structures, corrosion environment industrial plant steel structures and large indoor swimming pool steel structures.
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