阅读说明：本技术 一种耐候钢板表面修复工艺 (Weather-resistant steel plate surface repairing process ) 是由 陈炜 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种耐候钢板的表面修复工艺,包括清理、打磨、二次清理、表面锈蚀处理和表面封固,具体步骤如下：清理：用水冲洗清除表面灰尘、锈粉,手触摸上去没有粉末感即可；打磨：对于表面刮花损伤严重或损伤面积大的区域用打磨机进行打磨,细小划痕用砂纸打磨；二次清理：再次用水冲洗打磨后的表面粉尘,晾干；表面锈蚀处理：用生锈药水对打磨后的表面进行表面锈蚀处理,晾干；表面封固：采用复合水性封固涂料进行表面封固。本发明采用特种复合水性封固涂料对耐候钢板划痕、焊点进行现场修复,该涂料在修复层表面形成一封固层,1～2年自然脱落,同时耐候钢板锈蚀达到稳定,保证材料原始呈现效果。避免板材的整体更换,大大降低了修复成本。(The invention discloses a surface repairing process of a weather-resistant steel plate, which comprises the following steps of cleaning, polishing, secondary cleaning, surface corrosion treatment and surface sealing, and comprises the following specific steps: cleaning: washing with water to remove surface dust and rust powder, and removing no powder feeling by touching with hands; polishing: polishing the area with serious surface scratch damage or large damage area by using a polishing machine, and polishing the fine scratches by using abrasive paper; secondary cleaning: washing the polished surface dust with water again, and airing; surface corrosion treatment: carrying out surface corrosion treatment on the polished surface by using a rusting liquid medicine, and airing; surface sealing: and (3) carrying out surface sealing by adopting the composite water-based sealing coating. The method adopts the special composite water-based sealing coating to repair scratches and welding spots of the weather-resistant steel plate on site, the coating forms a sealing layer on the surface of the repairing layer, the sealing layer naturally falls off for 1 to 2 years, and meanwhile, the corrosion of the weather-resistant steel plate is stable, so that the original appearance effect of the material is ensured. The whole replacement of the plate is avoided, and the repair cost is greatly reduced.)

1. The surface repairing process of the weather-resistant steel plate is characterized by comprising the following steps of cleaning, polishing, secondary cleaning, surface corrosion treatment and surface sealing:

s1, cleaning: washing with water to remove surface dust and rust powder, and removing no powder feeling by touching with hands;

s2, grinding: polishing the area with serious surface scratch damage or large damage area by using a polishing machine, and polishing the fine scratches by using abrasive paper;

s3, secondary cleaning: washing the polished surface dust with water again, and airing;

s4, surface corrosion treatment: carrying out surface corrosion treatment on the polished surface by using a rusting liquid medicine, and airing;

s5, surface sealing: and (3) carrying out surface sealing by adopting the composite water-based sealing coating.

2. The method of claim 1, wherein the composite aqueous sealing coating is prepared by a method comprising the steps of:

stirring and emulsifying 2-hydroxyethyl acrylate, isooctyl methacrylate, styrene, an emulsifier and water at normal temperature to obtain a homogeneous emulsion;

step two, slowly adding the homogeneous emulsion into a mixture of hydroxyethyl cellulose, an initiator and water at the temperature of 65-95 ℃, adding for 1-2 hours, continuing to react for 2-3 hours after the addition is finished, neutralizing with organic alkali until the pH value is 7-9, cooling and discharging to obtain polyacrylate resin;

and step three, mixing the polyacrylate resin, the organic fluorine polymer, the polytetrafluoroethylene wax powder and a proper amount of coating auxiliary agent to obtain the composite water-based sealing coating.

3. The method of claim 1, wherein in the first step and the second step, the weight parts of the components are as follows: 100 parts of acrylic acid-2-hydroxyethyl ester and isooctyl methacrylate, 80-100 parts of styrene, 1-5 parts of emulsifier, 5-15 parts of hydroxyethyl cellulose and 0.2-2.0 parts of initiator.

4. The method of claim 3, wherein the 2-hydroxyethyl acrylate and the isooctyl methacrylate are present in a weight ratio of 1: 1-3.

5. The method of claim 1, wherein the emulsifier is selected from at least one of an anionic surfactant or a nonionic surfactant.

6. The method of claim 5, wherein the anionic surfactant is selected from at least one of sodium dodecyl diphenyl ether disulfonate, alkyl alcohol polyether sulfosuccinic acid monoester sodium salt, sodium dodecyl benzene sulfonate, or dicyclohexyl sulfosuccinate; the nonionic surfactant is selected from at least one of nonylphenol polyoxyethylene ether, dibenzylcumyl phenol polyoxyethylene ether, rosin acid polyoxyethylene ester or glycerol polyoxyethylene ether polyoxypropylene ether fatty acid ester.

7. The method of claim 1, wherein the initiator is selected from at least one of potassium persulfate, ammonium persulfate, and sodium persulfate.

8. The method of claim 1, wherein in the third step, the weight parts of the components are as follows: 100 parts of polyacrylate resin, 5-15 parts of organic fluorine polymer, 10-25 parts of polytetrafluoroethylene wax powder and 3-8 parts of coating additive.

9. The method of claim 1, wherein the coating aids comprise dispersants, defoamers, and leveling agents.

10. The method of claim 1, wherein the rust lotion is selected from oxalic acid, hydrogen peroxide, or a combination thereof.

Technical Field

The invention relates to the technical field of repair of weather-resistant steel plates, in particular to a surface repair process of a weather-resistant steel plate.

Background

The use of the rust-plated steel sheet as a building facade material has been known in north america, western europe, australia, asia, japan, and korea. The main technical support point of the rust steel plate which can be used as a facade material is that the corrosion resistance of the rust steel plate is super strong compared with that of common steel. Under natural climate, the steel material forms a compact oxide layer with thickness of about 50-100um and good adhesion with the matrix metal, namely rusty red, between the rust layer and the matrix by adding weather-resistant alloy elements such as copper, chromium, niobium, molybdenum, nickel, titanium, rare earth and the like into the steel plate.

Because of the existence of the dense oxide film, oxygen and water in the atmosphere are prevented from permeating into the steel matrix, the deep development of corrosion to steel materials is slowed down, and the corrosion phenomenon is avoided like common steel, so that the atmospheric corrosion resistance and the decorative effect of the steel plate material are greatly improved.

Research shows that the atmospheric corrosion resistance of the rust steel plate is improved by 5-8 times compared with common steel because the components of the steel plate are different and the service environments of the steel members are different. The special dense oxide layer formed on the surface of the steel plate has stable and uniform natural rusty red color, so that the steel plate is an attractive building exterior wall material.

Weather-resistant steel plate materials are widely applied to the outer wall surfaces of buildings in the last 10 years; landscape structures, gadgets, sculptures; in bridges and the like, although the material has good atmospheric corrosion resistance, the material is easy to scratch, if a hot welding process is adopted on site, welding spots are easy to mark on the surface of the material, rust water marks are easy to adhere seriously, and scale peeling and the like appear. Welding marks and the like during installation destroy the texture which should be presented on the original surface of the plate. The occurrence of these conditions can affect the aesthetic effect that is desired to be achieved using the material. If the plate is replaced integrally, the engineering quantity is large, and the economic investment is large.

Disclosure of Invention

The invention aims to provide a surface repairing process of a weather-resistant steel plate, which aims to overcome the defects in the prior art.

The invention is realized by the following technical scheme:

the surface repairing process of the weather-resistant steel plate comprises the following steps of cleaning, polishing, secondary cleaning, surface corrosion treatment and surface sealing:

s1, cleaning: washing with water to remove surface dust and rust powder, and removing no powder feeling by touching with hands;

s2, grinding: polishing the area with serious surface scratch damage or large damage area by using a polishing machine, and polishing the fine scratches by using abrasive paper;

s3, secondary cleaning: washing the polished surface dust with water again, and airing;

s4, surface corrosion treatment: carrying out surface corrosion treatment on the polished surface by using a rusting liquid medicine, and airing;

s5, surface sealing: and (3) carrying out surface sealing by adopting the composite water-based sealing coating.

The preparation method of the composite water-based sealing coating comprises the following steps:

stirring and emulsifying 2-hydroxyethyl acrylate, isooctyl methacrylate, styrene, an emulsifier and water at normal temperature to obtain a homogeneous emulsion;

step two, slowly adding the homogeneous emulsion into a mixture of hydroxyethyl cellulose, an initiator and water at the temperature of 65-95 ℃, adding for 1-2 hours, continuing to react for 2-3 hours after the addition is finished, neutralizing with organic alkali until the pH value is 7-9, cooling and discharging to obtain polyacrylate resin;

and step three, mixing the polyacrylate resin, the organic fluorine polymer, the polytetrafluoroethylene wax powder and a proper amount of coating auxiliary agent to obtain the composite water-based sealing coating.

Preferably, in the first step and the second step, the weight parts of the components are as follows: 100 parts of acrylic acid-2-hydroxyethyl ester and isooctyl methacrylate, 80-100 parts of styrene, 1-5 parts of emulsifier, 5-15 parts of hydroxyethyl cellulose and 0.2-2.0 parts of initiator; the amount of water is adjusted according to the viscosity of the reaction system and the change of fluid, and is generally 1 to 8 times of the total weight of the monomers.

Further preferably, the weight ratio of the 2-hydroxyethyl acrylate to the isooctyl methacrylate is 1: 1-3.

The emulsifier is selected from at least one of an anionic surfactant or a nonionic surfactant; the anionic surfactant is selected from at least one of sodium dodecyl diphenyl ether disulfonate, alkyl alcohol polyether sulfosuccinic acid monoester sodium salt, sodium dodecyl benzene sulfonate or dicyclohexyl sulfosuccinate; the nonionic surfactant is selected from at least one of nonylphenol polyoxyethylene ether, dibenzylcumyl phenol polyoxyethylene ether, rosin acid polyoxyethylene ester or glycerol polyoxyethylene ether polyoxypropylene ether fatty acid ester.

The initiator is at least one of potassium persulfate, ammonium persulfate and sodium persulfate.

The organic alkali is at least one of ethylenediamine, triethanolamine, diethanolamine or diethylenetriamine.

In the third step, the weight parts of the components are as follows: 100 parts of polyacrylate resin, 5-15 parts of organic fluorine polymer, 10-25 parts of polytetrafluoroethylene wax powder and 3-8 parts of coating additive.

The coating auxiliary agent comprises a dispersing agent, a defoaming agent, a leveling agent and the like, the functions and the selection of specific components are common knowledge in the field, and the coating auxiliary agent can be easily added and adjusted by a person skilled in the art according to the actual use requirement.

Preferably, in step S2, the sandpaper is selected to have a size of 120 to 180 meshes according to the damage degree.

Preferably, the rust lotion is selected from oxalic acid, hydrogen peroxide or a mixture of the oxalic acid and the hydrogen peroxide.

After the surface sealing is completed in step S5, if the local display effect is not satisfactory, steps S2 to S5 may be repeated until the satisfactory effect is achieved.

The method adopts the special composite water-based sealing coating to repair scratches and welding spots of the weather-resistant steel plate on site, the coating forms a sealing layer on the surface of the repairing layer, the sealing layer naturally falls off for 1 to 2 years, and meanwhile, the corrosion of the weather-resistant steel plate is stable, so that the original appearance effect of the material is ensured. The whole replacement of the plate is avoided, and the repair cost is greatly reduced.

Detailed Description

The invention is illustrated below by means of specific examples, without being restricted thereto. All the raw materials are conventional commercial products unless otherwise specified.

Examples

The outer wall and the roofing of a certain building venue all adopt weather-proof steel plate materials, and the outer wall structure is, from outside to inside in proper order: 1.4 thick weather-resistant steel plate wall surface; 2.1.5 macromolecular waterproof breathable films; 3.2mm thick aluminum veneer (fluorocarbon spray); 4.120 × 60 × 5mm hot dip galvanized steel pipe; thermal insulation rock wool with the thickness of 5.100 mm; 6.1.5mm hot-dip galvanized steel sheet; 7. a steel body structure; 8.5 thick FC trim panels. The scratch marks affect the overall beauty of the building due to the stain marks of other materials on the original plates. The specific repair process comprises the following steps:

1. cleaning: the plate is arranged on the keel, and surface dust and rust powder are washed clearly by water. The powder feeling is not generated when the hand touches the product;

2. polishing: the area with large surface scraping damage and large damage area is polished by a polisher, and fine scratches can be polished by abrasive paper. Selecting 120-180 meshes of abrasive paper sheets according to the damage degree;

3. washing the polished surface dust with water again, and airing;

4. carrying out surface corrosion treatment by using a rust liquid medicine (a mixed liquid medicine of oxalic acid and hydrogen peroxide in a ratio of 1: 1), and drying in the air;

5. surface sealing: carrying out surface sealing by adopting composite water-based sealing coating;

preparing the composite water-based sealing coating:

1. stirring and emulsifying 35 parts of acrylic acid-2-hydroxyethyl ester, 65 parts of isooctyl methacrylate, 100 parts of styrene, 3 parts of emulsifier and 500 parts of water at normal temperature to obtain homogeneous emulsion;

2. slowly adding the homogeneous emulsion into a mixture of 10 parts of hydroxyethyl cellulose, 1 part of initiator and 100 parts of water at the temperature of 85 ℃ for 1.5 hours, continuously reacting for 2.5 hours after the addition is finished, neutralizing with organic alkali until the pH value is 8, cooling and discharging to obtain polyacrylate resin;

3. and mixing 100 parts of the prepared polyacrylate resin with 10 parts of organic fluorine polymer, 15 parts of polytetrafluoroethylene wax powder, 3 parts of dispersing agent, 1.5 parts of defoaming agent and 1.5 parts of flatting agent to obtain the composite water-based sealing coating.

Comparative example

Another place with the same scratch damage in the embodiment is selected for repair comparison, the surface sealing coating is not used, other repair methods are the same as the embodiment, and the specific steps are as follows:

1. cleaning: the plate is arranged on the keel, and surface dust and rust powder are washed clearly by water. The powder feeling is not generated when the hand touches the product;

2. polishing: the area with large surface scraping damage and large damage area is polished by a polisher, and fine scratches can be polished by abrasive paper. Selecting 120-180 meshes of abrasive paper sheets according to the damage degree;

3. washing the polished surface dust with water again, and airing;

4. rust treatment is carried out on the surface by using a rust liquid medicine (a mixed liquid medicine of oxalic acid and hydrogen peroxide in a ratio of 1: 1), and the surface is dried.

The neutral salt spray test and the xenon lamp aging test are carried out on the steel plates repaired by the two repairing methods, and the specific test method comprises the following steps:

1. and (3) testing items: neutral salt spray

Environmental conditions: temperature (27 + -2) ° C, humidity (50 + -5)% RH

And (3) testing conditions are as follows:

1) concentration of NaCl: 50 +/-5 g/L;

2) pH of the solution in the collection: 6.5-7.2;

3) testing the temperature in the box: (35. + -. 2) ℃ C; temperature of the saturator: (47 + -2) deg.C;

4) salt spray settling rate: (1-2.5) mL/(h 80 cm);

5) test time: 200h

And (3) test results: after the test, the examples were checked for no significant change in appearance, and the comparative examples were checked for the appearance of blistering and slight cracking.

2. And (3) testing items: xenon lamp aging

Environmental conditions: temperature (27 + -2) deg.C; humidity (50. + -. 5)% RH

And (3) testing conditions are as follows:

1) irradiance (340 nm): 0.51W/m²；

2) Black mark temperature: (65 + -2) deg.C;

3) water spraying period: 18min/102min (water spray time/no water spray time);

4) test time: and (5) 250 h.

And (3) test results: after the test, the examples were checked for no significant change in appearance and the comparative examples were checked for slight yellowing in appearance.

According to the detection results of the embodiment and the comparative example, the scratch of the weather-resistant steel plate is repaired on site by adopting the special composite water-based sealing coating, and the coating forms a sealing layer on the surface of the repairing layer, so that the corrosion of the weather-resistant steel plate is stable, and the original presenting effect of the material is ensured.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.