A kind of coal mine anchor cable anticorrosion coating and its preparation method and application method

Abstract

The present invention relates to the technical field of metal anticorrosion coatings, and in particular to an anticorrosion coating for coal mine anchor cables, and a preparation method and an application method thereof. An anticorrosion coating for coal mine anchor cables, comprising the following components in mass percentage: 63.22-64.06% bisphenol A epoxy resin, 0.30-0.40% alkyl sulfonic acid, 0.30-0.60% aluminum magnesium silicate, 2.57-2.71% titanium dioxide, 0.30-0.40% antimony trioxide, 32.14-32.28% polysulfide rubber, and the balance is color powder. The anchor cable anticorrosion coating of the present invention has good coating performance, excellent bonding performance with the anchor cable surface, and can well prevent anchor cable corrosion. The anticorrosion coating has excellent mechanical properties and processing properties, and has wear resistance, flame retardancy, and antistatic functions. After the anticorrosion coating is coated on the surface of the anchor cable, it not only achieves the anticorrosion function, but also meets the working environment of high stress, high temperature, and high water spraying underground, greatly improving the service life of the anchor cable underground in the coal mine.

Description

Technical Field

[0001] The invention relates to the technical field of metal anti-corrosion coatings, and in particular to an anti-corrosion coating for coal mine anchor cables and a preparation method and an application method thereof. Background Art

[0002] Due to the special underground environment of coal mines, rock water often seeps into the tunnels. Rock water contains certain salts and alkaline substances, which can cause serious corrosion of underground anchor support materials, thereby destroying the strength of the support structure, causing great safety hazards in coal mine production. Therefore, it is extremely important to study the corrosion protection of underground anchor support materials in coal mines.

[0003] From the analysis of the corrosion mechanism, it can be seen that the corrosion of anchor cables is mainly due to electrochemical corrosion caused by contact with external media. In addition, under the action of high ground stress, the impact of corrosion on anchor cable materials is strengthened, which will reduce the service life of anchor cable materials or even cause premature failure. Especially for anchor cables under high stress, stress corrosion is very likely to occur in a corrosive environment, leading to premature failure.

[0004] Anchor cable corrosion protection coating is an important protective measure to prevent underground safety accidents. Currently, most anchor cables are severely corroded due to the high salt, high humidity and high water conditions underground, and often fail within their service life.

[0005] Therefore, there is an urgent need to provide a technical solution to the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] One of the purposes of the present invention is to provide an anti-corrosion coating for coal mine anchor cables, which not only achieves the purpose of anti-corrosion of the anchor cables, but also has certain wear-resistant, flame-retardant and anti-static functions, thereby solving the problem of severe corrosion of existing anchor cables underground.

[0007] In order to achieve the above objectives, this application provides the following technical solutions:

[0008] A coal mine anchor cable anti-corrosion coating, comprising the following components in percentage by mass:

[0009] Bisphenol A epoxy resin 63.22-64.06%, alkyl sulfonic acid 0.30-0.40%, aluminum magnesium silicate 0.30-0.60%, titanium dioxide 2.57-2.71%, antimony trioxide 0.30-0.40%, polysulfide rubber 32.14-32.28%, and the balance is color powder.

[0010] Color powder is mainly some pigments and fillers, mainly a mixture of aluminum powder and mica powder.

[0011] The second object of the present invention is to provide a method for preparing an anti-corrosion coating for coal mine anchor cables, which is easy to operate.

[0012] In order to achieve the above objectives, this application provides the following technical solutions:

[0013] A method for preparing an anti-corrosion coating for a coal mine anchor cable comprises the following steps:

[0014] Add bisphenol A epoxy resin into a reaction kettle and heat it to a molten state; then add alkyl sulfonic acid, aluminum magnesium silicate, titanium dioxide, antimony trioxide and polysulfide rubber, add color powder to adjust the color of the coating, and stir evenly to obtain the anchor cable anti-corrosion coating.

[0015] Preferably, the melting temperature is 175-185°C.

[0016] The third object of the present invention is to provide an application method of an anti-corrosion coating for coal mine anchor cables, by applying the anti-corrosion coating to the anchor cables, the corrosion protection capability of the anchor cables when used underground is improved, and since the coating has the functions of wear resistance, flame retardancy and anti-static, the anchor cables also have the functions of wear resistance, flame retardancy and anti-static. The method can be produced quickly and flexibly according to customer needs to meet the different needs of customers.

[0017] In order to achieve the above objectives, this application provides the following technical solutions:

[0018] A method for applying an anti-corrosion coating for coal mine anchor cables comprises the following steps:

[0019] (1) Put the original wire rod from the steel plant into the wire drawing machine and cold draw it into steel strands; after degreasing and derusting the steel strands, put them into the degreasing tank, let them stand, and then put them into the clean water tank for cleaning; then put the steel strands into the derusting tank to remove the rust and oxide scale on the surface, and then put them into the clean water tank for cleaning;

[0020] (2) Place the steel strands after degreasing and rust removal in a cooling pool for cooling, and then dry the steel strands after cooling; add the anti-corrosion coating to a reactor, heat it to a molten state, and then place the dried steel strands into the reactor, immerse them, take them out and let them stand, waiting for the anti-corrosion coating to solidify;

[0021] (3) The steel strand with the anti-corrosion coating is placed on a pay-off rack, twisted into strands by a twisting device, and then the anchor cable is straightened by a straightening device to obtain a finished anchor cable with an anti-corrosion coating.

[0022] Preferably, in step (1), the rust removal time in the rust removal tank is 2 hours.

[0023] Preferably, in step (3), the diameter of the anchor cable is 15.24-21.6 mm.

[0024] Preferably, in step (3), the anchor cable is formed by twisting 7 strands of steel wire, and the diameter of the central steel wire is larger than the diameter of the outer ring steel wire.

[0025] Further preferably, the anchor cable with a diameter of 15.24 mm is composed of 6 5.03 mm outer steel wires and 1 5.16 mm central steel wire; the anchor cable with a diameter of 17.8 mm is composed of 6 5.87 mm outer steel wires and 1 6.02 mm central steel wire; the anchor cable with a diameter of 21.6 mm is composed of 6 7.18 mm outer steel wires + 1 7.36 mm central steel wire.

[0026] The functions of each component of the anti-corrosion coating are as follows:

[0027] Bisphenol A epoxy resin: Bisphenol A epoxy resin is a thermoplastic resin with thermosetting properties, high strength and bonding strength, excellent chemical corrosion resistance and electrical insulation, and is used as a base material for anti-corrosion coatings.

[0028] Alkyl sulfonic acid: It inhibits electrochemical reactions on the metal surface by forming a protective film layer, reduces static electricity accumulation, enhances the density and adhesion of the coating, and forms an effective barrier to prevent corrosive media such as moisture and oxygen from contacting the metal surface.

[0029] Magnesium aluminum silicate: Increases the viscosity, fluidity and spreadability of the coating, making it easier for the coating to form a uniform film during construction, maintains the stable dispersion of the various components, prevents the sedimentation of solid particles, ensures the uniformity of the coating components, avoids stratification or precipitation, and extends the service life of the coating.

[0030] Titanium dioxide: Increases the density of the anti-corrosion coating and enhances its anti-seepage capability.

[0031] Antimony trioxide: During the combustion process, it can melt and form a protective film on the surface of the material. This protective film can effectively isolate oxygen, slow down or prevent the spread of flames, inhibit the chain reaction of polymer material combustion, and play a role in scavenging free radicals, thereby slowing down the combustion speed until it is extinguished.

[0032] Polysulfide rubber: Combined with epoxy resin, the modified epoxy resin contains more epoxy groups, which can significantly improve the adhesion performance of the coating. During the curing process, the hydroxyl groups are etherified, making the chemical structure more stable, thereby enhancing the corrosion resistance, improving the toughness of the coating, and improving the friction resistance of the coating.

[0033] Color powder: Add appropriate amount of color powder to enhance the aesthetics.

[0034] Beneficial effects:

[0035] The anchor cable anti-corrosion coating of the present invention has good coating performance and excellent bonding performance with the anchor cable surface, and can well prevent the anchor cable from corrosion. The anti-corrosion coating has excellent mechanical properties and processing properties, and has wear resistance, flame retardancy, and anti-static functions. After the anti-corrosion coating is coated on the surface of the anchor cable, it not only achieves the anti-corrosion function, but also meets the working environment of high stress, high temperature, and high water spray underground, greatly improving the service life of the anchor cable in the coal mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. Among them:

[0037] Figure 1 Schematic diagram of the anti-corrosion treated anchor cable in Example 1 of the present invention;

[0038] Figure 2 The anti-corrosion treated anchor cable of the present invention;

[0039] Figure 3 Ordinary anchor cable. DETAILED DESCRIPTION

[0040] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the embodiments of the present invention should belong to the scope of protection of the embodiments of the present invention.

[0041] 1. The specific embodiments of the anti-corrosion coating of coal mine anchor cables of the present invention are as follows:

[0042] Example 1

[0043] A coal mine anchor cable anti-corrosion coating comprises the following steps:

[0044] (1) Add bisphenol A epoxy resin into a reactor and heat it to 180°C. At this time, the bisphenol A epoxy resin is in a molten state.

[0045] (2) Using 63.40-63.87% bisphenol A epoxy resin as the base liquid, add 0.31-0.38% alkyl sulfonic acid, 0.35-0.52% aluminum magnesium silicate, 2.57-2.69% titanium dioxide, 0.33-0.38% antimony trioxide, and 32.14-32.25% polysulfide rubber, add the remaining color powder to adjust the color of the coating, stir thoroughly to make the components evenly dispersed, and obtain the anchor cable anti-corrosion coating.

[0046] Example 2

[0047] A coal mine anchor cable anti-corrosion coating comprises the following steps:

[0048] (1) Add bisphenol A epoxy resin into the reactor, turn on the heating, set the temperature to 177°C, and heat all the bisphenol A epoxy resin to a molten state.

[0049] (2) Using 63.62-63.79% bisphenol A epoxy resin as the base liquid, add 0.35-0.39% alkyl sulfonic acid, 0.42-0.58% aluminum magnesium silicate, 2.60-2.67% titanium dioxide, 0.35-0.39% antimony trioxide, and 32.17-32.24% polysulfide rubber, add the remaining color powder to adjust the color of the coating, and stir thoroughly to evenly disperse the components to obtain an anchor cable anti-corrosion coating.

[0050] Example 3

[0051] A coal mine anchor cable anti-corrosion coating comprises the following steps:

[0052] (1) Add bisphenol A epoxy resin into the reactor, turn on the heating, set the temperature to 183°C, and heat all the bisphenol A epoxy resin to a molten state.

[0053] (2) Using 63.43-63.98% bisphenol A epoxy resin as the base liquid, add 0.33-0.35% alkyl sulfonic acid, 0.46-0.54% aluminum magnesium silicate, 2.63-2.68% titanium dioxide, 0.33-0.37% antimony trioxide, and 32.19-32.28% polysulfide rubber, add appropriate amount of color powder to adjust the color of the coating, stir thoroughly to make the components evenly dispersed, and obtain the anchor cable anti-corrosion coating.

[0054] 2. The specific embodiment of the method for preparing the anti-corrosion coating of coal mine anchor cable of the present invention is as follows:

[0055] Example 4

[0056] A method for preparing an anti-corrosion coating for a coal mine anchor cable comprises the following steps:

[0057] (1) Put the original wire rod from the steel mill into the wire drawing machine, and cold-draw the wire rod into steel strands with diameters of 5.03 mm and 5.16 mm respectively. Put the steel strands into the degreasing tank, let it stand for about 5 minutes, and then put them into the clean water tank for cleaning. Then put the steel strands into the rust removal tank, remove the surface rust and oxide scale through the pickling chemical reaction, and then put them into the clean water tank for cleaning.

[0058] (2) Place the steel strands that have been degreased and derusted in a cooling pool and let them stand for about 20 minutes to cool. After cooling, place the steel strands in a drying furnace for drying.

[0059] (3) Add the anti-corrosion coating to the reactor and heat it to a molten state. Then put the dried steel strand into the reactor, immerse it for 5 minutes, take it out and let it stand, waiting for the anti-corrosion coating to solidify.

[0060] (4) The steel strands coated with the anti-corrosion coating are placed on the pay-off frame, wherein the steel strands with a diameter of 5.03 mm are used as the outer ring steel wires and the steel strands with a diameter of 5.16 mm are used as the center steel wires. Six 5.03 mm outer ring steel wires and one 5.16 mm center steel wire are twisted into strands by a twisting device. Then the anchor cable is straightened by a straightening device to obtain a finished anchor cable with an anti-corrosion coating and twisted from seven strands of steel strands. The diameter of the finished anchor cable with the anti-corrosion coating is 15.24 mm, as shown in FIG. Figure 1 shown.

[0061] Example 5

[0062] A method for preparing an anti-corrosion coating for a coal mine anchor cable comprises the following steps:

[0063] (1) Put the original wire rod from the steel mill into the wire drawing machine, and cold-draw the wire rod into steel strands with diameters of 5.87 mm and 6.02 mm respectively. Put the steel strands into the degreasing tank, let them stand for about 7 minutes, and then put them into the clean water tank for cleaning. Then put the steel strands into the rust removal tank, remove the surface rust and oxide scale through the pickling chemical reaction, and then put them into the clean water tank for cleaning.

[0064] (2) Place the steel strands that have been degreased and derusted in a cooling pool and let them stand for about 25 minutes to cool. After cooling, place the steel strands in a drying furnace for drying.

[0065] (3) Add the anti-corrosion coating to the reactor and heat it to a molten state. Then put the dried steel strand into the reactor, immerse it for 7 minutes, take it out and let it stand, waiting for the coating to solidify.

[0066] (4) The steel strands with anti-corrosion coating are placed on the pay-off frame, wherein the steel strands with a diameter of 5.87 mm are used as the outer ring steel wires and the steel strands with a diameter of 6.02 mm are used as the center steel wires. Six 5.87 mm outer ring steel wires and one 6.02 mm center steel wire are twisted into strands by twisting equipment. The anchor cable is then straightened by straightening equipment to obtain a finished anchor cable with anti-corrosion coating and twisted from seven strands of steel strands. The diameter of the finished anchor cable with anti-corrosion coating is 17.8 mm.

[0067] Example 6

[0068] A method for preparing an anti-corrosion coating for a coal mine anchor cable comprises the following steps:

[0069] (1) Put the original wire rod from the steel mill into the wire drawing machine, and cold-draw the wire rod into steel strands with diameters of 7.18 mm and 7.36 mm respectively. Put the steel strands into the degreasing tank, let them stand for about 10 minutes, and then put them into the clean water tank for cleaning. Then put the steel strands into the rust removal tank, remove the surface rust and oxide scale through the pickling chemical reaction, and then put them into the clean water tank for cleaning.

[0070] (2) Place the steel strands that have been degreased and derusted in a cooling pool and let them stand for about 30 minutes to cool. After cooling, place the steel strands in a drying furnace for drying.

[0071] (3) Add the anti-corrosion coating to the reactor and heat it to a molten state. Then put the steel strand that has been dried into the reactor, immerse it for 10 minutes, take it out and let it stand, waiting for the coating to solidify.

[0072] (4) The steel strands with anti-corrosion coating are placed on the pay-off frame, wherein the steel strands with a diameter of 7.18 mm are used as the outer ring steel wires and the steel strands with a diameter of 7.36 mm are used as the center steel wires. Six 7.18 mm outer ring steel wires and one 7.36 mm center steel wire are twisted into strands by twisting equipment. The anchor cable is then straightened by straightening equipment to obtain a finished anchor cable with anti-corrosion coating and twisted from seven strands of steel strands. The diameter of the finished anchor cable with anti-corrosion coating is 21.6 mm.

[0073] 3. Characterization and analysis of anchor cable anti-corrosion performance

[0074] (1) Experimental plan

[0075] The analysis of the anchor corrosion mechanism and main corrosion influencing factors in a certain mining area shows that the chloride ions in the mine water are the most significant corrosion to the anchor. In order to test the corrosion resistance of the anchor anti-corrosion treatment materials, ordinary anchors and anti-corrosion treated anchors were constructed in the same tunnel area underground at the same time. Ordinary anchors and anti-corrosion treated anchors were arranged alternately to make their corrosion environment the same. The two anchors were corroded underground for 1 year at the same time, and the corrosion morphology of the two anchors was observed.

[0076] (2) Analysis of anchor corrosion morphology

[0077] After one year of corrosion in the underground environment, both the ordinary anchor cable and the anti-corrosion treated anchor cable have suffered different degrees of corrosion. Photos were taken to record the corrosion of the two anchor cables. Figure 2 As shown in the figure, the morphology of the ordinary anchor cable after corrosion is as follows Figure 3 shown.

[0078] Observation of the corrosion condition of anchor specimens:

[0079] Depend on Figure 2 and Figure 3It can be seen that the corrosion products of steel belts, trays and locks attached to the surface of the anti-corrosion treated anchor cable are less rusted, and there is no rust on the end part and no rust swelling. The surface of the ordinary anchor cable is obviously rusted, the color is dark, and there is 5cm of rust on the end, and rust swelling occurs.

[0080] Compared with the prior art, the anti-corrosion coating of the coal mine anchor cable of the present invention has an obvious anti-corrosion effect and can reduce the probability of underground safety accidents.

[0081] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coal mine anchor cable anti-corrosion coating, characterized in that: The composition includes the following mass percentages: Bisphenol A epoxy resin 63.40-63.98%, alkyl sulfonic acid 0.31-0.39%, aluminum magnesium silicate 0.35-0.58%, titanium dioxide 2.57-2.68%, antimony trioxide 0.33-0.39%, polysulfide rubber 32.14-32.28%, the balance is color powder; The preparation method thereof comprises the following steps: Add bisphenol A epoxy resin into a reaction kettle and heat it to a molten state; then add alkyl sulfonic acid, aluminum magnesium silicate, titanium dioxide, antimony trioxide and polysulfide rubber, add color powder to adjust the color of the coating, stir evenly to obtain an anchor cable anti-corrosion coating, and the melting temperature is 175-185°C.

2. The application method of the anti-corrosion coating for coal mine anchor cables according to claim 1, characterized in that: The following steps are involved: (1) Put the original wire rod from the steel plant into the wire drawing machine and cold draw it into steel strands; after degreasing and derusting the steel strands, put them into the degreasing tank, let them stand, and then put them into the clean water tank for cleaning; then put the steel strands into the derusting tank to remove the rust and oxide scale on the surface, and then put them into the clean water tank for cleaning; (2) Place the steel strands after degreasing and rust removal in a cooling pool for cooling, and then dry the steel strands after cooling; add the anti-corrosion coating to a reactor, heat it to a molten state, and then place the dried steel strands into the reactor, immerse them, take them out and let them stand, waiting for the anti-corrosion coating to solidify; (3) The steel strand with anti-corrosion coating is placed on a pay-off frame, twisted into strands by twisting equipment, and then straightened by straightening equipment to obtain a finished anchor cable with anti-corrosion coating, wherein the anchor cable is twisted from 7 strands of steel strands, the diameter of the central steel wire is larger than the diameter of the outer steel wire, and the diameter of the anchor cable is 15.24-21.6 mm. The anchor cable with a diameter of 15.24 mm is composed of 6 5.03 mm outer steel wires and 1 5.16 mm central steel wire; the anchor cable with a diameter of 17.8 mm is composed of 6 5.87 mm outer steel wires and 1 6.02 mm central steel wire; the anchor cable with a diameter of 21.6 mm is composed of 6 7.18 mm outer steel wires + 1 7.36 mm central steel wire.

3. The application method of the anti-corrosion coating for coal mine anchor cables according to claim 2 is characterized in that: In step (1), the rust removal time in the rust removal tank is 2 hours.

Images