Anti-skid coating for hydraulic support pedal and preparation method of anti-skid coating

Abstract

The invention relates to an anti-skid coating for a hydraulic support pedal and a preparation method of the anti-skid coating. The anti-skid coating comprises a primer, an intermediate paint and a finish paint, the primer is modified epoxy resin, the intermediate paint is primer mixed with anti-skid particles, and the finish paint is polyurethane resin coating liquid. The preparation method comprises the following steps: pretreating the surface of the hydraulic support pedal, coating the primer, coating the intermediate paint on the surface of the primer, coating the finish paint on the intermediate paint, and curing to obtain the antiskid coating of the hydraulic support pedal. The anti-skid coating has the advantages of excellent anti-skid performance, strong adhesive force, good corrosion resistance and the like. Through surface treatment and primer coating of a base material of the hydraulic support pedal, the binding force of the anti-skid coating and the pedal is remarkably improved, and the anti-skid coating is not prone to falling off; by adding the anti-skid particles, the anti-skid coating has excellent anti-skid performance, and an operator can be effectively prevented from slipping; and the corrosion resistance of the coating is enhanced through coating of the primer and the finish paint, and the service life of the hydraulic support pedal is prolonged.

Description

Technical Field

[0001] The present invention relates to an anti-slip coating for a hydraulic support footrest and a preparation method thereof, belonging to the technical field of anti-slip materials. Background Art

[0002] Hydraulic supports are important equipment in underground operations such as coal mines. As the standing platform for operators, the anti-slip performance of their footrests is crucial. However, the existing footrest coatings have poor anti-slip performance, which easily causes operators to slip and poses a safety hazard. Therefore, it is particularly important to develop a coating preparation method with excellent anti-slip performance.

[0003] In the prior art, such as the one with the publication number CN 221819969 U and the name "An anti-slip footrest", it is disclosed that an anti-slip plate is provided on the top of the footrest body. Installation grooves are formed on the surface of the footrest body. Anti-slip strips are evenly and fixedly installed on the surface of the anti-slip plate. Slide grooves and clamping grooves are symmetrically formed inside the installation grooves respectively. Sliders and clamping blocks are symmetrically and fixedly installed on the inner side of the anti-slip plate respectively. The sliders are slidably connected with the slide grooves. The sliders and the slide grooves are both provided with rounded corners. The clamping blocks are inserted into the clamping grooves. Through the settings of the sliders, slide grooves, clamping blocks and clamping grooves, the sliders slide in the slide grooves to achieve the rapid installation of the anti-slip plate. By inserting the clamping blocks into the clamping grooves, the installation block is quickly fixed on the surface of the footrest body, thus facilitating the disassembly and assembly of the anti-slip plate, realizing the detachable property of the anti-slip plate, facilitating the disassembly and replacement of the anti-slip plate after being used for a period of time, and improving the practicability of the footrest. However, the footrest with designs such as sliders and slide grooves has a long production and processing time, low production efficiency, complex installation, too many parts, and the anti-slip is only achieved by the anti-slip strips evenly and fixedly installed on the surface of the anti-slip plate. After being used for a period of time, the friction of the anti-slip strips will decrease with wear, and its anti-slip ability is average.

[0004] Anti-slip footrests are mainly used to provide support for the operator's feet. During use, the anti-slip footrests face multiple slides and abrasions. As the use time increases, the risk of slipping increases. Common protective measures include adding anti-slip pads and using anti-slip materials. Adding anti-slip pads can effectively increase the friction between the shoes and the anti-slip pads, but the friction between the anti-slip pads and the footrest cannot be well determined. After a long use time, the sliding risk increases and it is not safe. In addition, general anti-slip materials are prepared with rubber and polyurethane materials. However, in the underground coal mine environment where hydraulic supports are used, such materials have serious fire hazards. Therefore, for the footrests of hydraulic supports, such materials cannot be used. Therefore, how to effectively improve the anti-slip performance of the footrests of hydraulic supports in underground operations is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] To solve the above problems of the prior art, the present invention provides an anti-slip coating for a hydraulic support footrest and a preparation method thereof.

[0007] (II) Technical Solution

[0008] To achieve the above object, the main technical solutions adopted by the present invention include:

[0009] An anti-slip coating for a hydraulic support footrest, which comprises a primer, an intermediate paint and a topcoat. The primer is composed of a modified epoxy resin. Its preparation method is to mix bisphenol A epoxy resin with a polyetheramine curing agent, and then add nano-silica as a modifier and mix evenly; the intermediate paint is obtained by adding anti-slip particles to the primer; the topcoat is composed of a polyurethane resin coating solution, which contains aliphatic polyurethane resin and ethyl acetate.

[0010] For the anti-slip coating as described above, preferably, in the intermediate paint, the anti-slip particles are corundum, and their particle size is 50-100 microns. The anti-slip particles account for 10%-30% of the mass of the primer.

[0011] For the anti-slip coating as described above, preferably, the primer comprises bisphenol A epoxy resin, a polyetheramine curing agent and nano-silica, and their mass ratio is 3-6:1:0.1-0.3; further preferably, the mass ratio is 4:1:0.2.

[0012] For the anti-slip coating as described above, preferably, the topcoat comprises aliphatic polyurethane resin and ethyl acetate, and their mass ratio is 3-6:1; further preferably, the mass ratio is 4:1.

[0013] A preparation method for a hydraulic support footrest with an anti-slip coating, preferably, it comprises the following steps:

[0014] S1. Pretreat the surface of the hydraulic support footrest to remove oil stains, rust and old coatings;

[0015] S2. Coat a layer of primer on the surface of the pretreated footrest; the primer is a modified epoxy resin. Its preparation method is to mix bisphenol A epoxy resin with a polyetheramine curing agent according to a mass ratio of 3-6:1, and then add nano-silica as a modifier and mix evenly. Among them, the addition amount of nano-silica is 3-10% of the mass of bisphenol A epoxy resin;

[0016] S3. Add anti-slip particles to the primer to obtain an intermediate paint, and brush the surface of the footrest again with the intermediate paint;

[0017] S4. Coat the topcoat; among them, the topcoat is an aliphatic polyurethane resin coating solution, its solid content is 75-85%, the diluent is ethyl acetate, and the addition amount of the diluent is 15-25% of the mass of the aliphatic polyurethane resin;

[0018] S5. Cure the painted footrest to obtain a hydraulic support footrest with an anti-slip coating.

[0019] In the preparation method as described above, preferably, in step S1, the pretreatment is sandblasting or grinding so that the surface of the footrest reaches Sa2.5 or St3 level.

[0020] In the preparation method as described above, preferably, in step S2, the painting thickness of the primer is 50 - 100 microns.

[0021] In the preparation method as described above, preferably, in step S3, in the intermediate paint, the anti-slip particles are corundum, the particle size of the anti-slip particles is 50 - 100 microns, and the addition amount is 10% - 30% of the mass of the primer.

[0022] In a preferred embodiment, in step S4, the painting thickness of the topcoat is 30 - 50 microns.

[0023] In a preferred embodiment, in step S5, the temperature of the curing treatment is 80 - 120 °C, and the time of the curing treatment is 2 - 4 h.

[0024] (III) Beneficial effects

[0025] The beneficial effects of the present invention are as follows:

[0026] An anti-slip coating for a hydraulic support footrest provided by the present invention has the advantages of excellent anti-slip performance, strong adhesion, good corrosion resistance, etc.

[0027] A preparation method of an anti-slip coating for a hydraulic support footrest provided by the present invention, through surface treatment and primer painting of the substrate of the hydraulic support footrest, significantly improves the bonding force between the coating and the substrate, and it is not easy to fall off; secondly, by adding anti-slip particles to the primer to obtain an intermediate paint and continuing to paint the intermediate paint on the surface of the primer, the prepared coating has excellent anti-slip performance and can effectively prevent operators from slipping. Finally, an aliphatic polyurethane resin topcoat with good wear resistance is painted to extend the retention time of the anti-slip particles; the painting of the used raw material primer and topcoat enhances the corrosion resistance of the coating and extends the service life of the hydraulic support footrest. Description of the drawings

[0028] Figure 1 It is a schematic diagram of a preferred anti-slip coating for a hydraulic support footrest of the present invention.

[0029]

Description of the reference numerals

[0030] 1: Footrest;

[0031] 2: Primer;

[0032] 3: Intermediate paint. Specific implementation mode

[0033] In the present invention, modified epoxy resin is used as the coating substrate. Corundum is sprinkled on the coating substrate, and then topcoat is applied on the substrate. The effective combination of the coating substrate and the topcoat enables the pedal coating to have anti-corrosion, wear resistance, anti-slip, and fire resistance properties at the same time. The present invention adopts modified epoxy resin and polyurethane resin to fully combine two different materials, and becomes the best coating choice for the pedal of hydraulic supports with the advantages of low cost, quick effect, and simple production, meeting the underground working conditions of hydraulic supports and the requirements of safety production.

[0034] In the present invention, Sa2.5 grade and St3 grade are internationally common surface treatment cleanliness standards, which are used to ensure good adhesion between the substrate and the coating and long-term anti-corrosion effect. Among them, Sa2.5 grade refers to sandblasting cleaning. All visible grease, scale, rust, old coatings and other pollutants on the surface need to be removed, and only trace stubborn attachments are allowed to remain, such as the remaining area ≤ 5%. The surface presents a uniform metallic color, forming a roughness suitable for painting, usually Ra 20 - 50μm.

[0035] St3 grade refers to manual / power tool cleaning. Loose scale, rust layer and old coatings on the surface need to be thoroughly removed, and only firmly attached residues are allowed, such as the remaining area ≤ 10%. The surface needs to be polished until it shows metallic luster, but the roughness is lower than that of sandblasting, and Ra is usually < 25μm.

[0036] A method for preparing an anti-slip coating applied to the pedal of a hydraulic support provided by the present invention includes the following steps:

[0037] S1. Surface treatment: Pretreat the surface of the pedal of the hydraulic support, such as degreasing, derusting, and grinding, to improve the bonding force between the coating and the substrate.

[0038] S2. Primer coating: Coat a layer of primer on the surface of the pretreated pedal to enhance the adhesion and corrosion resistance of the coating. Among them, the primer is modified epoxy resin, specifically, bisphenol A epoxy resin and polyetheramine curing agent are mixed at a mass ratio of 3 - 6:1, and then nano-silica is added. The addition amount of nano-silica is 3 - 10% of the mass of bisphenol A epoxy resin. The coating thickness of the primer is preferably 50 - 100 microns.

[0039] S3. Intermediate paint coating: Add anti-slip particles such as corundum as the intermediate paint to the primer to improve the anti-slip performance of the coating. Coat the intermediate paint mixed with anti-slip particles on the pedal coated with the primer in step S2.

[0040] S4. Topcoat painting: Apply a topcoat on the primer added with anti-slip particles to protect the anti-slip particles and improve the aesthetics of the coating. Among them, the polyurethane resin of the topcoat is specifically aliphatic polyurethane resin, its solid content is 80%, the diluent is ethyl acetate, the addition amount of the diluent is 20% of the mass of the polyurethane resin, and the painting thickness of the topcoat is 30 - 50 microns.

[0041] S5. Curing treatment: Cure the painted footrest to closely combine the coating with the footrest substrate to form a coating with excellent anti-slip performance. Among them, the curing treatment is to cure at a temperature of 80 - 120°C for 2 - 4 hours. If the temperature is too low, such as below 80°C, the coating will not cure completely and the adhesion will decrease; if the temperature is too high, above 120°C, the coating may crack or discolor. The curing time is preferably 2 - 4h. A short time will cause incomplete curing of the coating, and too long will may lead to a decline in the coating performance. Therefore, the curing time is preferably 2 - 4h.

[0042] To better explain the present invention for easy understanding, the present invention will be described in detail below in conjunction with the drawings through specific embodiments. The raw materials used in the present invention can be purchased products. Among them, bisphenol A epoxy resin, polyetheramine curing agent, nano-silica, aliphatic polyurethane resin can be purchased from, and ethyl acetate can be purchased from Shanghai Chuangsui Chemical Technology Co., Ltd.

[0043] Example 1

[0044] A method for preparing an anti-slip coating applied to a hydraulic support footrest, comprising the following steps:

[0045] S1. Surface treatment: Pretreat the surface of the hydraulic support footrest by sandblasting or other methods to remove oil stains, rust and old coatings, so that the surface reaches the Sa2.5 level of sandblasting treatment.

[0046] S2. Primer painting: Put the pretreated footrest into the spray booth and apply a layer of primer, a modified epoxy resin, specifically bisphenol A epoxy resin and polyetheramine curing agent are mixed in a mass ratio of 4:1, add nano-silica, and the addition amount of nano-silica is 5% of the mass of the epoxy resin. The painting thickness of the primer is 80 microns.

[0047] S3. Intermediate coat painting: Add anti-slip particles corundum particles as the intermediate coat to the primer. Among them, the particle size of the corundum particles is 80 microns, and the addition amount is 20% of the mass of the primer. Apply the intermediate coat mixed with anti-slip particles on the footrest coated with the primer in step S2.

[0048] S4, Topcoat Coating: Apply a layer of topcoat on the primer added with anti-slip particles. The topcoat is polyurethane resin, specifically aliphatic polyurethane resin, with a solid content of 80%. The specific preparation is to add ethyl acetate as a diluent to the aliphatic polyurethane resin, and the addition amount of the diluent is 20% of the mass of the polyurethane resin; the coating thickness of the topcoat is 40 microns.

[0049] S5, Curing Treatment: Place the coated footrest in an oven and cure it at a temperature of 100 °C for 3 hours to make the coating tightly bond with the substrate.

[0050] Example 2

[0051] A method for preparing an anti-slip coating for a hydraulic support footrest, comprising the following steps:

[0052] S1, Surface Treatment: Use a grinding method, such as a angle grinder or a wire brush, to pre-treat the surface of the hydraulic support footrest, remove oil stains, rust and old coatings, so that the surface reaches the standard St3 level of manual mechanical rust removal.

[0053] S2, Primer Coating: Place the pre-treated footrest in a spray booth and apply a layer of primer using a spray gun; the primer is a modified epoxy resin, and its preparation method is to mix bisphenol A epoxy resin and polyetheramine curing agent in a mass ratio of 4:1, and then add nano-silica, and the addition amount of nano-silica is 5% of the mass of the epoxy resin; the coating thickness of the primer is 60 microns.

[0054] S3, Intermediate Coating: Add anti-slip particles corundum particles as an intermediate coating to the primer. The particle size of the corundum particles is 60 microns, and the addition amount is 15% of the mass of the primer. Apply the intermediate coating mixed with anti-slip particles on the footrest coated with the primer in step S2.

[0055] S4, Topcoat Coating: Apply a layer of topcoat on the primer added with anti-slip particles. The topcoat is an aliphatic polyurethane resin coating solution with a solid content of 80%; the diluent of the coating solution is ethyl acetate, and the addition amount of the diluent is 20% of the mass of the aliphatic polyurethane resin, and the coating thickness of the topcoat is 35 microns.

[0056] S5, Curing Treatment: Place the coated footrest in an oven and cure it at a temperature of 90 °C for 2.5 hours to make the coating tightly bond with the substrate.

[0057] The anti-slip coating for a hydraulic support footrest prepared according to the above method, its structure Figure 1As shown in the figure, the upper surface of the foot pedal 1 is a steel base layer, coated with a primer 2 on it, an intermediate paint 3 containing corundum on the primer 2, and a topcoat is applied on the outermost layer. After curing, an anti-slip coating for the foot pedal of the hydraulic support can be obtained. This anti-slip coating of the plate has excellent anti-slip performance and adhesion, can effectively improve the standing stability of the operator, and reduce potential safety hazards.

[0058] Perform performance tests on the anti-slip coatings prepared in the above Examples 1-2. Anti-slip performance: Through the static friction coefficient test, the static friction coefficient of the coating reaches above 0.7, meeting the requirements for anti-slip performance in underground coal mine operations.

[0059] Adhesion test: Adopt the cross-cut method for testing. The adhesion of the coating reaches grade 0, indicating that the coating is tightly bonded to the substrate and is not easy to fall off.

[0060] Corrosion resistance test: After soaking in a 3% sodium chloride solution for 72 hours, there is no obvious corrosion phenomenon on the coating, indicating that the coating has good corrosion resistance.

[0061] Abrasion resistance test: Use a Taber abrasion tester for testing. The wear rate of the coating is lower than 0.05 g / 1000 revolutions, showing excellent abrasion resistance.

[0062] Fire resistance test: Test according to the GB / T 2408-2008 standard. The combustion grade of the coating reaches V-0, indicating that the coating has good fire resistance.

[0063] As described above, for the anti-slip coating of the foot pedal of the hydraulic support obtained by the above method, after surface treatment and primer coating, the bonding force between the coating and the substrate is significantly improved and it is not easy to fall off. By adding anti-slip particles, the prepared coating has excellent anti-slip performance and can effectively prevent the operator from slipping; the corrosion resistance of the coating is enhanced through the coating of the primer and the topcoat, extending the service life of the foot pedal of the hydraulic support.

[0064] Comparative Example 1

[0065] Use ordinary epoxy resin as the primer without adding nano-silica modifier, and the other steps are the same as in Example 1. The test results show that the adhesion of the coating is only grade 1, the wear rate in the abrasion resistance test is 0.1 g / 1000 revolutions, the anti-slip performance and fire resistance are comparable to those in Example 1, but the corrosion resistance is poor, and there is a slight corrosion phenomenon after soaking in the sodium chloride solution for 48 hours.

[0066] Comparative Example 2

[0067] Without applying a primer, the pedal is directly sanded and then coated with an intermediate paint + topcoat containing anti-slip particles; other steps are the same as those in Example 2. The test results show that the adhesion of the coating is Grade 1, the wear rate in the abrasion resistance test is 0.12 g / 1000 revolutions, the anti-slip performance and fire resistance are comparable to those in Example 2, but the corrosion resistance is poor, and slight corrosion occurs after soaking in sodium chloride solution for 48 hours.

[0068] By comparing the examples and comparative examples, it can be seen that through the prepared primer and topcoat and the optimized preparation process of the present invention, the adhesion, abrasion resistance and corrosion resistance of the coating are significantly improved, while ensuring good anti-slip performance and fire resistance, which has obvious innovation and practicability.

[0069] Thus, a non-slip coating for a hydraulic support foot pedal and its preparation method provided by the present invention achieve excellent anti-slip performance, adhesion, abrasion resistance and corrosion resistance of the coating through reasonable design of the coating structure and optimization of the preparation process, which can effectively reduce potential safety hazards in underground coal mine operations and has broad application prospects.

[0070] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art can use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An anti-slip coating for the foot pedal of a hydraulic support, characterized in that, It includes a primer, an intermediate paint and a topcoat. Among them, the primer is a modified epoxy resin, and its preparation method is to mix bisphenol A epoxy resin with a polyetheramine curing agent, and then add nano-silica and mix evenly; the intermediate paint is obtained by adding anti-slip particles to the primer; the topcoat is a polyurethane resin coating solution, which contains aliphatic polyurethane resin and ethyl acetate.

2. The anti-slip coating according to claim 1, characterized in that, In the intermediate paint, the anti-slip particles are corundum, with a particle size of 50 to 100 microns, and the anti-slip particles account for 10% to 30% of the mass of the primer.

3. The anti-slip coating according to claim 1, wherein The primer includes bisphenol A epoxy resin, a polyetheramine curing agent and nano-silica, and their mass ratio is 3 to 6:1:0.1 to 0.

3.

4. The anti-slip coating according to claim 1, characterized in that, The topcoat includes aliphatic polyurethane resin and ethyl acetate, and their mass ratio is 3 to 6:

1.

5. A preparation method of a hydraulic support footrest with an anti-slip coating, characterized in that, It includes the following steps: S1. Pretreat the surface of the hydraulic support footrest to remove oil stains, rust and old coatings; S2. Coat a layer of primer on the pretreated footrest surface; among them, the primer is a modified epoxy resin, and its preparation method is to mix bisphenol A epoxy resin with a polyetheramine curing agent according to a mass ratio of 3 to 6:1, and then add nano-silica and mix evenly, where the addition amount of nano-silica is 3% to 10% of the mass of bisphenol A epoxy resin; S3. Add anti-slip particles to the primer to obtain the intermediate paint, and brush the footrest surface again with the intermediate paint; S4. Coat the topcoat; among them, the topcoat is an aliphatic polyurethane resin coating solution with a solid content of 75% to 85%, and the diluent is ethyl acetate, and the addition amount of the diluent is 15% to 25% of the mass of the aliphatic polyurethane resin; S5. Cure the footrest after coating the topcoat to obtain a hydraulic support footrest with an anti-slip coating.

6. The preparation method according to claim 1, characterized in that, In step S1, the pretreatment is sandblasting or grinding to make the surface of the footrest reach Sa2.5 level or St3 level.

7. The preparation method according to claim 1, characterized in that, In step S2, the coating thickness of the primer is 50 to 100 microns.

8. The preparation method according to claim 1, characterized in that, In step S3, in the intermediate paint, the anti-slip particles are corundum, the particle size of the anti-slip particles is 50 to 100 microns, and the addition amount is 10% to 30% of the mass of the primer.

9. The preparation method according to claim 1, characterized in that, In step S4, the coating thickness of the topcoat is 30 to 50 microns.

10. The preparation method according to claim 1, characterized in that, In step S5, the temperature of the curing treatment is 80 to 120 °C, and the curing treatment time is 2 to 4 h.

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