Waterproof coating for colored profiled steel sheet roof and construction method

Abstract

The invention relates to a colored profiled steel sheet roof waterproof coating and a construction method thereof. The colored profiled steel sheet roof waterproof coating comprises the following components in parts by weight: 20-40 parts of ceramic particles; 10 to 20 parts of nano particles; 30-50 parts of a high-molecular polymer base material; 5-15 parts of an anti-ultraviolet additive; 5 to 15 parts of self-repairing microcapsules; 2-8 parts of a dispersant; 2-8 parts of a leveling agent; ceramic particles and a high-molecular polymer base material in the coating can effectively resist salt spray corrosion, and nanoparticles form a compact waterproof layer, so that water leakage caused by corrosion of the colored profiled steel sheet due to water permeation and accumulation is prevented; the anti-ultraviolet additive enhances the anti-ultraviolet ability of the coating, the self-contained microcapsules uniformly distributed in the coating can be broken when the coating is damaged, the internal efficient repairing agent is released, the damaged area is rapidly filled and cured, the integrity of the coating is recovered, and the maintenance cost and frequency are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of waterproof coatings, and specifically relates to a colored corrugated steel plate roof waterproof coating and a construction method. Background Art

[0002] The production environment of metallurgical plants is usually harsh, especially because of the convenience of sea transportation in coastal areas. When the factory is located in coastal areas, the roofing materials of the factory need to have high waterproof performance and durability. However, when the existing color corrugated steel sheet roof faces the harsh environment unique to coastal areas such as salt spray, high humidity and strong ultraviolet rays, the salt content in the air in coastal areas is high, and the salt spray will accelerate the corrosion process of the color corrugated steel sheet. Under the erosion of salt spray, the surface coating of ordinary steel plates is easily damaged, causing the steel plate substrate to be exposed to the corrosive environment, and finally leading to the degradation of structural performance; at the same time, the humidity in coastal areas is high all year round. In a high humidity environment, the waterproof performance of ordinary color corrugated steel sheets is easy to decline, and the coating is prone to blistering and falling off in a high humidity environment. Especially at the joints of the plates and around the screw holes, water seepage is more likely to occur, as well as problems such as ultraviolet radiation and thermal expansion and contraction, which not only affects the overall waterproof effect, but also increases the maintenance cost and difficulty.

[0003] Although there are many anti-corrosion and waterproof coating technologies on the market, there are still some shortcomings in the above environment, such as; the protective ability of single-layer coating is limited; ordinary single-layer coating materials are difficult to meet the multiple needs of anti-corrosion, waterproofing and UV resistance at the same time. In salt spray and high humidity environments, single-layer coatings are easily corroded and penetrated, resulting in poor protection; high maintenance costs, traditional coatings require frequent maintenance and repair after damage, especially in high altitude and difficult-to-reach roof areas, the maintenance workload is large and the cost is high. Once ordinary coatings are damaged, manual inspection and repair are required, which increases the investment of manpower and financial resources; the coating ages quickly, and long-term exposure to strong ultraviolet rays makes ordinary coatings prone to aging and failure, and the protective performance decreases, which is difficult to meet the long-term use needs of metallurgical plants in coastal areas.

[0004] Therefore, how to improve the waterproof performance and durability of the colored corrugated steel sheet roofs of metallurgical plants in coastal areas has become a technical problem to be solved by the present invention. Summary of the invention

[0005] In order to solve the problem that the waterproof performance and durability of colored corrugated steel sheets are greatly reduced due to the high humidity and high salinity of roofs paved with colored corrugated steel sheets in coastal areas, the present invention proposes a colored corrugated steel sheet roof waterproof coating and a construction method.

[0006] A colored corrugated steel sheet roof waterproof coating comprises the following components in parts by weight:

[0007] 20-40 parts of ceramic particles;

[0008] 10-20 parts of nanoparticles;

[0009] 30-50 parts of high molecular polymer base material;

[0010] 5-15 parts of anti-ultraviolet additives;

[0011] 5-15 parts of self-repairing microcapsules;

[0012] Dispersant and leveling agent 2-8 parts;

[0013] Furthermore, the ceramic particles are aluminum oxide or zinc oxide, forming a salt spray resistant protective layer.

[0014] Furthermore, the nanoparticles are silicon dioxide or titanium dioxide, forming a dense waterproof layer.

[0015] Furthermore, the high molecular polymer base material is used to provide adhesion of the coating and enhance the durability of the coating.

[0016] Furthermore, the anti-ultraviolet additive is used to enhance the anti-ultraviolet capability of the coating and prevent the coating from falling off due to long-term exposure to sunlight.

[0017] Furthermore, the dispersant and leveling agent are used to ensure the uniformity and stability of the coating, the weight fraction ratio of the dispersant and leveling agent is 1:1 or 1:2, and the total amount of the dispersant and leveling agent does not exceed 2-8 parts.

[0018] Furthermore, the diameter of the self-repairing microcapsule is controlled between 10-50 μm, the self-repairing microcapsule is filled with a high-efficiency repair agent, the shell material of the self-repairing microcapsule is polyurethane or polymethyl methacrylate, polyurethane or polymethyl methacrylate has good mechanical strength and chemical stability, and will not break during the spraying process; the high-efficiency repair agent filled inside the self-repairing microcapsule is epoxy resin or polymer resin, which has excellent self-repairing ability; after the coating is used for a long time, the shell of the self-repairing capsule begins to break, and the high-efficiency repair agent inside flows out to repair the coating, thereby restoring the integrity of the coating. There is no need for frequent manual repair of the coating, thereby reducing the repair frequency.

[0019] Furthermore, the interior of the self-repairing microcapsule is also filled with pigment, and the color of the pigment can be selected according to needs, such as red and orange; when the self-repairing capsule is damaged and undergoes self-repair, the bright color reminds the user that the self-repairing capsule has been used, reminding the user to replace the waterproof coating in time, and the colored corrugated steel roof will not be corroded due to failure to discover the damage in time.

[0020] Furthermore, there is sufficient seawater in coastal areas, and the seawater can be used to make self-repairing capsules, including the following steps;

[0021] S1. Prepare emulsion: Use seawater as reaction medium, mix seawater, monomers of shell material and internal filling material to form emulsion; there are a lot of salt and minerals in seawater, which can improve the anti-corrosion performance of microcapsules during the reaction process;

[0022] S2. preparing self-repairing microcapsules: forming microcapsules by emulsion polymerization or interfacial polymerization;

[0023] S3, subsequent treatment: washing the self-repairing microcapsules with fresh water to remove excess salt and impurities, and drying after washing to complete the preparation;

[0024] Furthermore, the self-healing microcapsules need to be evenly distributed in the coating, and a high shear mixer or ultrasonic dispersing equipment may be used during mixing to ensure the even distribution of the self-healing microcapsules in the coating.

[0025] Furthermore, pigments can be added to the coating composition to directly change the color of the coating. Taking red and orange as examples, the red pigment is iron oxide red or quinacridone red, and the orange pigment is iron oxide orange or benzimidazolone orange. The coating to which the pigment is added includes the following components in parts by weight:

[0026] 20-40 parts of ceramic particles;

[0027] 10-20 parts of nanoparticles;

[0028] 30-50 parts of high molecular polymer base material;

[0029] 5-15 parts of anti-ultraviolet additives;

[0030] 5-15 parts of self-repairing microcapsules;

[0031] Dispersant and leveling agent 2-8 parts;

[0032] 1-3 parts of iron oxide orange pigment or 1-3 parts of iron oxide red pigment;

[0033] Use a high shear mixer or ultrasonic dispersing equipment to mix to ensure uniform distribution of the pigment in the coating.

[0034] Furthermore, it also includes a construction method of a colored corrugated steel sheet roof waterproof coating, comprising the following steps: first, the surface of the colored corrugated steel sheet roof to be sprayed is cleaned to ensure that there is no dust, oil stains and other impurities. After cleaning, the coating is mixed evenly and evenly sprayed on the surface of the colored corrugated steel sheet roof to form a coating with a coating thickness of 100-150μm.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The ceramic particles and high molecular polymer base in the coating can effectively resist salt spray corrosion and extend the service life of the color corrugated steel sheet. The nanoparticles form a dense waterproof layer to prevent water from penetrating and accumulating, corroding the color corrugated steel sheet and causing water leakage. The anti-ultraviolet additive enhances the anti-ultraviolet ability of the coating and prevents the coating from aging, fading and cracking due to long-term exposure to sunlight. The self-contained microcapsules evenly distributed in the coating can rupture when the coating is damaged, releasing the high-efficiency repair agent inside to quickly fill and solidify the damaged area, restore the integrity of the coating, and reduce maintenance costs and frequency.

[0037] The need for frequent maintenance of the coating is further reduced, especially for high-altitude and hard-to-reach roof areas, which significantly reduces maintenance costs and manpower investment. Pigments are added to the inside of the self-repairing capsules. When the self-repairing capsules are damaged and self-repairing, bright colors remind users that the self-repairing capsules have been used, reminding users to replace the waterproof coating in time. DETAILED DESCRIPTION

[0038] Example 1

[0039] A colored corrugated steel sheet roof waterproof coating comprises the following components in parts by weight:

[0040] 30 parts of ceramic particles;

[0041] Nanoparticles 10 parts;

[0042] 40 parts of high molecular polymer base material;

[0043] 5 parts of anti-ultraviolet additives;

[0044] 5 parts of self-repairing microcapsules;

[0045] 2 parts of dispersant and leveling agent;

[0046] Pigments may be added to the coating component to change the color. Taking red and orange as examples, the red pigment is iron oxide red or quinacridone red, and the orange pigment is iron oxide orange or benzimidazolone orange.

[0047] The ceramic particles are aluminum oxide.

[0048] The nanoparticles are silicon dioxide.

[0049] The self-repairing microcapsules are evenly distributed in the coating, the diameter of the self-repairing microcapsules is 10-50 μm, and the self-repairing microcapsules include a shell material and an internal filling material.

[0050] The self-repairing microcapsules are uniformly distributed in the coating.

[0051] The self-repairing microcapsule shell material is polyurethane or polymethyl methacrylate.

[0052] The internal filling material of the self-repairing microcapsule is epoxy resin or polymer resin.

[0053] The self-repairing microcapsules are filled with pigments.

[0054] Example 2

[0055] A colored corrugated steel sheet roof waterproof coating comprises the following components in parts by weight:

[0056] 20 parts of ceramic particles;

[0057] Nanoparticles 20 parts;

[0058] 40 parts of high molecular polymer base material;

[0059] 5 parts of anti-ultraviolet additives;

[0060] 5 parts of self-repairing microcapsules;

[0061] 2 parts of dispersant and leveling agent;

[0062] The ceramic particles are aluminum oxide, and the nanoparticles are silicon dioxide, which are mixed using a high shear mixer or an ultrasonic dispersing device to form a coating.

[0063] Example 3

[0064] A colored corrugated steel sheet roof waterproof coating comprises the following components in parts by weight:

[0065] 10 parts of ceramic particles;

[0066] 30 parts of nanoparticles;

[0067] 30 parts of high molecular polymer base material;

[0068] 10 parts of anti-ultraviolet additives;

[0069] 5 parts of self-repairing microcapsules;

[0070] 4 parts of dispersant and leveling agent;

[0071] The ceramic particles are zinc oxide and the nanoparticles are silicon dioxide, which are mixed by using a high shear mixer or an ultrasonic dispersing device to form a coating.

[0072] Example 4

[0073] A red colored corrugated steel sheet roof waterproof coating comprises the following components in parts by weight:

[0074] 10 parts of ceramic particles;

[0075] 30 parts of nanoparticles;

[0076] 30 parts of high molecular polymer base material;

[0077] 10 parts of anti-ultraviolet additives;

[0078] 5 parts of self-repairing microcapsules;

[0079] 4 parts of dispersant and leveling agent;

[0080] 3 parts of red iron oxide pigment;

[0081] After mixing using a high shear mixer or an ultrasonic dispersing device, a red colored corrugated steel sheet roof waterproof coating is obtained.

[0082] Example 5

[0083] The components described in Examples 1-4 were respectively placed in a reactor, stirred at a speed of 1600 r / min for 30 min, and stirred evenly, then inspected, bagged, sealed, barreled, and stored. The coatings of the components described in Examples 1-4 were evenly applied on four color steel tiles with a thickness of 0.3 mm. The coatings were allowed to dry at room temperature. After drying, they were treated at 120° C. for 30 min. After cooling to room temperature, their performance was tested. The test results are shown in the following table.

[0084]

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0086] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A colored corrugated steel sheet roof waterproof coating, characterized in that: The composition comprises the following components in parts by weight: 20-40 parts of ceramic particles; 10-20 parts of nanoparticles; 30-50 parts of high molecular polymer base material; 5-15 parts of anti-ultraviolet additives; 5-15 parts of self-repairing microcapsules; Dispersant and leveling agent 2-8 parts; Pigments may be added to the coating composition to change the color.

2. The colored corrugated steel sheet roof waterproof coating according to claim 1, characterized in that: The ceramic particles are aluminum oxide or zinc oxide.

3. The colored corrugated steel sheet roof waterproof coating according to claim 1, characterized in that: The nanoparticles are silicon dioxide or titanium dioxide.

4. The colored corrugated steel sheet roof waterproof coating according to claim 1, characterized in that: The self-repairing microcapsules are evenly distributed in the coating, the diameter of the self-repairing microcapsules is 10-50 μm, the self-repairing microcapsules include shell materials and internal filling materials, and the self-repairing microcapsules are evenly distributed in the coating.

5. The colored corrugated steel sheet roof waterproof coating according to claim 4, characterized in that: The ratio of the dispersant to the leveling agent is 1:1 or 1:2, and the total amount of the dispersant and the leveling agent is 2-8 parts.

6. The colored corrugated steel sheet roof waterproof coating according to claim 4, characterized in that: The self-repairing microcapsule shell material is polyurethane or polymethyl methacrylate.

7. The colored corrugated steel sheet roof waterproof coating according to claim 4, characterized in that: The internal filling material of the self-repairing microcapsule is epoxy resin or polymer resin.

8. The colored corrugated steel sheet roof waterproof coating according to claim 4, characterized in that: The self-repairing microcapsules are filled with pigments.

9. The colored corrugated steel sheet roof waterproof coating according to claim 1, characterized in that: The self-repairing microcapsules are manufactured using an emulsion polymerization method or an interfacial polymerization method, and include the following steps: S1. preparing an emulsion: using seawater as a reaction medium, mixing seawater, monomers of a shell material and an internal filling material to form an emulsion; S2. preparing self-repairing microcapsules: forming microcapsules by emulsion polymerization or interfacial polymerization; S3. Subsequent treatment: washing the self-repairing microcapsules with fresh water, and drying them after washing to complete the preparation.

10. A construction method of a colored corrugated steel sheet roof waterproof coating according to any one of claims 1 to 9, characterized in that: After the coating is evenly mixed, it is evenly sprayed on the cleaned surface of the colored corrugated steel sheet roof to form a coating, and the coating thickness is 100-150 μm.

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