Quick-drying intumescent fire retardant coating for steel structure and preparation method thereof

Abstract

The invention discloses a quick-drying intumescent fire retardant coating for a steel structure and a preparation method of the quick-drying intumescent fire retardant coating, and the fire retardant coating comprises the following components in percentage by mass: 10-15% of acrylic resin, 15-20% of xylene, 20-25% of ammonium polyphosphate, 5-10% of pentaerythritol, 5-10% of melamine, 5-10% of nano titanium dioxide, 3-5% of mineral fiber and 5-10% of talcum powder. The auxiliaries comprise 5%-10% of isocaprylic acid rare earth, 5%-10% of chlorinated paraffin and 3%-5% of rheological auxiliaries, and the total amount of the auxiliaries accounts for 15%-20%. By using the combination of the solid acrylic resin, the thermoplastic solid acrylic resin and the isocaprylic acid rare earth, the drying efficiency of the coating under natural conditions, especially during low-temperature construction, can be remarkably improved. The fireproof material can be used for fire prevention of steel structures of commercial and public buildings and industrial and energy facilities (petrochemical plants / oil refineries, electric power facilities and factory warehouses).

Description

Technical Field

[0001] This invention relates to the field of fire-retardant coating technology, and more specifically to a fast-drying, intumescent fire-retardant coating for steel structures and its preparation method. Background Technology

[0002] Traditional solvent-based fire retardant coatings have long drying times and low application efficiency, requiring multiple coats to achieve the required thickness. Fire retardant coatings with fast curing speeds are particularly crucial for protection in the face of fire events with unpredictable timing.

[0003] A common problem with solvent-based fire retardant coatings is that during the autumn and winter seasons when temperatures are low, the solvent evaporates more slowly, resulting in a softer coating after a single coat. This delays the construction process. Additionally, rushing to meet deadlines under low temperatures and adverse weather conditions leads to incomplete curing of the coating, affecting its overall fire resistance. Summary of the Invention

[0004] In view of this, the present invention provides a method for preparing a fast-drying, intumescent fire-retardant coating, characterized in that the combination of solid acrylic resin, thermoplastic solid acrylic resin, and rare earth isooctanoate significantly improves the drying efficiency of the coating under natural conditions, especially during low-temperature application. It can be used for fire protection of steel structures in commercial and public buildings, industrial and energy facilities (petrochemical plants / refineries, power facilities, factory buildings and warehouses).

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fast-drying, intumescent fire-retardant coating for steel structures includes: acrylic resin, flame retardant, filler, additives, and solvent.

[0006] Preferably, the acrylate is obtained by compounding solid acrylic resin and thermoplastic solid acrylic resin. Solid acrylic resin and thermoplastic solid acrylic resin, due to the highly cross-linked molecular chains forming a three-dimensional network structure, possess extremely high hardness and mechanical strength, and the solvent is released rapidly during the curing process, shortening the drying time.

[0007] Preferably, the flame retardant includes ammonium polyphosphate, melamine, and pentaerythritol. The decomposition temperatures of these three substances are coordinated, resulting in a good foaming effect.

[0008] Preferably, the filler comprises titanium dioxide, mineral fibers, and talc. Nano-TiO2 has good photocatalytic activity and ultraviolet shielding properties, enhancing the weather resistance of the coating; mineral fibers can stabilize the carbon layer structure, prevent coating cracking, and reduce the flame intensity in the event of a fire; talc can stabilize the molecular structure in the coating and dries faster than general fillers.

[0009] Preferably, the additives include rheology modifiers, chlorinated paraffin, and rare earth isooctanoate. Rheology modifiers can better disperse mineral fibers and make the coating resistant to sagging during use. Chlorinated paraffin can improve the thixotropy of the coating, and rare earth isooctanoate can accelerate the curing of the coating and synergistically retard the flame retardant.

[0010] Preferably, the solvent is xylene. It can effectively dissolve solid acrylic resin, adjust the viscosity of the coating, and improve its workability.

[0011] Preferably, the above-mentioned quick-drying intumescent fire-retardant coating for steel structures, by weight percentage, specifically includes the following components: Acrylic resin 10-15%, xylene 15%-20%, ammonium polyphosphate 20%-25%, pentaerythritol 5%-10%, melamine 5%-10%, nano titanium dioxide 5%-10%, mineral fiber 3%-5%, talc 5%-10%; The additives include 5-10% rare earth isooctanoate, 5%-10% chlorinated paraffin, and 3%-5% rheology modifiers, with the total amount of additives accounting for 15%-20%.

[0012] Another object of the present invention is to provide a method for preparing the above-mentioned fast-drying intumescent fire-retardant coating for steel structures, comprising the following steps: (1) Add the measured xylene to the reactor, start stirring, add the acrylic resin to the xylene and disperse it to dissolve the acrylic resin completely. Then slowly add the chlorinated paraffin, rheology modifier, and rare earth isooctanoic acid. Continue stirring for 10-15 minutes to fully disperse the modifier in the solution and form a uniform dispersion. (2) Add nano titanium dioxide, ammonium polyphosphate, pentaerythritol, melamine and talc to the above dispersion in proportion and stir to form a uniform slurry; (3) Add the mineral fibers to the reactor and continue stirring to mix them thoroughly, so that the chlorinated paraffin and rheology modifier are fully activated; (4) Filter the uniformly mixed coating through a filter screen to remove impurities and large particles. Then package the filtered coating to obtain the finished product of quick-drying expansion type fireproof coating for steel structures.

[0013] Preferably, the stirring speed at the start of step (1) is 800-1000 r / min and the time is 20-35 min.

[0014] Preferably, in step (3), the stirring speed is 800-1000 r / min, the time is 15-20 min, and the stirring temperature is >45℃; In step (4), filtration is performed through a 40-80 mesh filter.

[0015] As can be seen from the above technical solution, compared with the prior art, the present invention has the following technical effects: In combustion tests, this fast-drying fire-retardant coating for steel structures demonstrated excellent fire resistance. Steel structures coated with this material effectively slowed the spread of fire and protected them from high-temperature damage in simulated fire environments. The fire-retardant components in the coating functioned as intended, forming an effective insulation layer and improving the fire resistance limit of the steel structure.

[0016] In drying time tests, the coating exhibited significant fast-drying properties, drying much faster than traditional fire-retardant coatings, greatly shortening the construction cycle and improving work efficiency. This advantage makes the coating widely applicable in emergency fire protection renovations or rapid construction projects.

[0017] In addition, the coating adheres tightly to the steel structure surface, is not easy to peel off, and can maintain good performance stability even when exposed to the outdoor environment for a long time. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 (as a comparison) This embodiment provides a fast-drying, intumescent fire-retardant coating for steel structures, comprising the following components:

[0020] Example 2 This embodiment provides a fast-drying, intumescent fire-retardant coating for steel structures, comprising the following components:

[0021] Example 3 This embodiment provides the preparation methods of Embodiments 1 and 2, including the following steps: 1. Pre-dispersion: Add the metered xylene solvent to the reactor, start stirring, and control the speed at 900 r / min. Add the solid acrylic resin to the solvent and disperse it to fully dissolve the solid acrylic resin. Stir for 28 min. Then slowly add chlorinated paraffin, rheology modifier, and rare earth isooctanoic acid. Continue stirring for 13 min to fully disperse the modifier in the solution and form a uniform dispersion. 2. Add nano-titanium dioxide, ammonium polyphosphate, pentaerythritol, melamine, and talc to the above dispersion in the specified proportions and stir to form a uniform slurry. 3. Add the mineral fibers to the reactor and continue stirring at a speed of 900 rpm. Ensure thorough mixing for 18 minutes, maintaining a stirring temperature above 45°C to fully activate the chlorinated paraffin and rheology modifier. 4. Filter the well-mixed coating through a 60-mesh filter (the screen should not be too fine to prevent the mineral fibers from being filtered out) to remove any impurities and large particles. Then package the filtered coating to obtain the finished quick-drying intumescent fireproof coating for steel structures.

[0022] Effect test Tests were conducted on Example 1, Example 2, and a common solvent-based fire-retardant coating. The results are shown in the table below:

[0023] Based on the test results in the table above, it can be seen that the combination of solid acrylic resin + thermoplastic acrylic resin + rare earth isooctanoate is superior to the combination of solid resin + rare earth isooctanoate in terms of surface drying and hard drying. The addition of thermoplastic acrylic resin, with its unique hydroxyl structure, enables the coating to dry rapidly at room temperature, and the crosslinking and curing speed is faster than using solid acrylic resin alone. At the same time, the addition of rare earth isooctanoate can also significantly accelerate the oxidative crosslinking of the resin, and its higher catalytic activity makes the fireproof coating reaction more efficient. At the same time, it has better drying speed, expansion after fire resistance and density of carbon layer than traditional solvent-based fire retardant coatings, solving the problems of slow drying speed and long construction period of traditional solvent-based fire retardant coatings.

[0024] Considering the speed and convenience of construction, the construction cost will be greatly reduced; while accelerating the drying speed, it ensures that the coating has excellent fire resistance, effectively improves the fire resistance of steel structures, and provides reliable fire protection for steel structure buildings.

[0025] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fast-drying, intumescent fireproof coating for steel structures, characterized in that, include: Acrylic resins, flame retardants, fillers, additives, and solvents.

2. The quick-drying, intumescent fireproof coating for steel structures according to claim 1, characterized in that, The acrylate is obtained by compounding solid acrylic resin and thermoplastic solid acrylic resin.

3. The quick-drying, intumescent fireproof coating for steel structures according to claim 1, characterized in that, The flame retardants include ammonium polyphosphate, melamine, and pentaerythritol.

4. The quick-drying, intumescent fireproof coating for steel structures according to claim 1, characterized in that, The filler includes titanium dioxide, mineral fibers, and talc.

5. The quick-drying, intumescent fireproof coating for steel structures according to claim 1, characterized in that, The additives include rheology modifiers, chlorinated paraffin, and rare earth isooctanoate.

6. The quick-drying, intumescent fireproof coating for steel structures according to claim 1, characterized in that, The solvent is xylene.

7. A quick-drying, intumescent fire-retardant coating for steel structures according to any one of claims 1-6, characterized in that, Listed by weight percentage, it specifically includes the following components: Acrylic resin 10-15%, xylene 15%-20%, ammonium polyphosphate 20%-25%, pentaerythritol 5%-10%, melamine 5%-10%, nano titanium dioxide 5%-10%, mineral fiber 3%-5%, talc 5%-10%; The additives include 5-10% rare earth isooctanoate, 5%-10% chlorinated paraffin, and 3%-5% rheology modifiers, with the total amount of additives accounting for 15%-20%.

8. The preparation method of a fast-drying, intumescent fire-retardant coating for steel structures as described in claim 7, characterized in that, Includes the following steps: (1) Add the measured xylene to the reactor, start stirring, add the acrylic resin to the xylene and disperse it to dissolve the acrylic resin completely. Then slowly add the chlorinated paraffin, rheology modifier, and rare earth isooctanoic acid. Continue stirring for 10-15 minutes to fully disperse the modifier in the solution and form a uniform dispersion. (2) Add nano titanium dioxide, ammonium polyphosphate, pentaerythritol, melamine and talc to the above dispersion in proportion and stir to form a uniform slurry; (3) Add the mineral fibers to the reactor and continue stirring to mix them thoroughly, so that the chlorinated paraffin and rheology modifier are fully activated; (4) Filter the uniformly mixed coating through a filter screen to remove impurities and large particles. Then package the filtered coating to obtain the finished product of quick-drying expansion type fireproof coating for steel structures.

9. The preparation method of a fast-drying, intumescent fire-retardant coating for steel structures according to claim 8, characterized in that, The stirring speed at the beginning of step (1) is 800-1000 r / min, and the time is 20-35 min.

10. The method for preparing a fast-drying, intumescent fire-retardant coating for steel structures according to claim 8, characterized in that, In step (3), the stirring speed is 800-1000 r / min, the time is 15-20 min, and the stirring temperature is >45℃; In step (4), filtration is performed through a 40-80 mesh filter.

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