CN115558418A - Nano SiO on surface of casting wedge tooth hob 2 Preparation process of super-hydrophobic coating - Google Patents
Nano SiO on surface of casting wedge tooth hob 2 Preparation process of super-hydrophobic coating Download PDFInfo
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- CN115558418A CN115558418A CN202211118650.7A CN202211118650A CN115558418A CN 115558418 A CN115558418 A CN 115558418A CN 202211118650 A CN202211118650 A CN 202211118650A CN 115558418 A CN115558418 A CN 115558418A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
The invention discloses a casting wedge hob surface nanometer S iO 2 The preparation process of the super-hydrophobic coating comprises the following steps: s1: preparing super-hydrophobic silica nanoparticles by using nano-scale silica, sodium hydroxide and dodecyl triethoxysilane as raw materials; s2: preparing a hyperbranched PDMS solution by using bisaminopropyl-terminated polydimethylsiloxane (A-PDMS) as a raw material; s3, preparing the S iO by using the super-hydrophobic silica nano particles and the super-branched PDMS solution as raw materials 2 A PDMS mixed dispersion; s4: to make S iO 2 Spraying the PDMS mixed dispersion liquid on the surface of the processed wedge tooth hob, and then heating and curing the coating; this application is carried out by preparing S iO 2 The PDMS mixed dispersion liquid is sprayed on the surface of a casting wedge tooth hob to prepare a super-hydrophobic coating, so that the mud pocket drilling phenomenon in the drilling process is relieved to a great extent, and the drilling efficiency is improved.
Description
Technical Field
The invention relates to the technical field of mining equipment. In particular to nano SiO on the surface of a casting wedge tooth hob 2 A preparation process of the super-hydrophobic coating.
Background
With the development of mine construction in China to a deeper surface soil layer with a larger diameter, higher requirements are put forward on the wear resistance and the service life of the hob. How to improve the drilling efficiency of the rock breaking wedge tooth hob becomes an important bottleneck restricting the popularization and application of a drilling method, and the service life of the rock breaking wedge tooth hob can not only effectively improve the pure drilling time in the drilling engineering and shorten the drilling period, but also greatly reduce the drilling cost.
The clay layers and the sandy clay layers encountered in the coal mine vertical well drilling process are more, and part of clay and sandy clay are easy to absorb water and expand and have stronger plasticity. When a viscous stratum is drilled, clay cut by the drill bit cannot be discharged in time, the clay adheres to the drill bit body and becomes a large mud cluster, and even a cutter is wrapped inside, so that the mud wraps the drill bit. In addition, when a cohesive soil layer is utilized for naturally slurrying in the drilling process, the slurry belongs to finely dispersed slurry, the number of fine particles is large, the cleaning is difficult, the viscosity is high, and the method is also one of the main reasons for generating the mud-coated drill bit. The frequent occurrence of the mud-covered drill bit phenomenon directly affects the drilling speed and reduces the drilling efficiency.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the nano SiO for casting the surfaces of the wedge hob which is non-toxic, environment-friendly and simple in steps 2 A preparation process of the super-hydrophobic coating.
In order to solve the technical problems, the invention provides the following technical scheme:
nano SiO for casting wedge tooth hobbing cutter surface 2 The preparation process of the super-hydrophobic coating comprises the following steps:
s1: with nanoscale silicon dioxide (SiO) 2 ) Sodium hydroxide and dodecyl triethoxysilane are used as raw materials to prepare the super-hydrophobic silicon dioxide nano particles;
s2: preparing a hyperbranched PDMS solution by using bisaminopropyl-terminated polydimethylsiloxane (A-PDMS) as a raw material;
s3, preparing SiO by using the super-hydrophobic silica nano particles and the super-branched PDMS solution as raw materials 2 A PDMS mixed dispersion;
s4: mixing SiO 2 Spraying the PDMS mixed dispersion liquid on the surface of the processed wedge tooth hob, and then heating to cure the coating.
Further, in the step S1, a certain amount of nano-scale silicon dioxide is weighed and completely dispersed in ethanol, sodium hydroxide and dodecyl triethoxysilane are added into an ethanol solution, the reaction is carried out for more than 5 hours at 70 ℃, then the pH value of the solution is adjusted to 6-7, the ethanol is used for centrifugal washing and precipitation, and finally, drying is carried out to obtain the super-hydrophobic silicon dioxide nano particles.
Furthermore, at least 50ml of ethanol is needed for dispersing 1g of nano-scale silicon dioxide, the mass ratio of the nano-scale silicon dioxide to the sodium hydroxide is 4: 1.2ml.
Further, in step S2, the preparation of the hyperbranched PDMS comprises the following steps: adding dimethyl siloxane (PDMS) and a curing agent into n-hexane, and carrying out ultrasonic oscillation for more than 30min to fully dissolve the dimethyl siloxane (PDMS) and the curing agent; the mass ratio of dimethyl siloxane (PDMS) to the curing agent is 10.
Further, in step S3, the super-hydrophobic silica nanoparticles are added into the hyperbranched PDMS solution and ultrasonically vibrated for more than 1 hour to prepare SiO 2 A PDMS mixed dispersion; the mass ratio of the super-hydrophobic silica nanoparticles to dimethyl siloxane (PDMS) is 3 2 The mass of the PDMS mixed dispersion liquid is 10 percent.
Further, step S4, during spraying, the distance between a nozzle and the surface of the wedge tooth hob is about 15cm-20cm, the spraying time is 2S, the spraying is carried out for three times, and the time interval is 10min each time; plasma spraying is adopted; and heating the sprayed wedge tooth hob for 2 hours at the temperature of 150 ℃ to cure the coating.
Furthermore, before spraying, the surface of the hob is cleaned to remove oil, impurities and a surface oxide layer.
The technical scheme of the invention achieves the following beneficial technical effects:
according to the method, the super-hydrophobic coating is prepared on the surface of the hob, and the super-hydrophobic silica nanoparticles are added into the super-hydrophobic coating, so that the aging resistance of the coating can be improved while the super-lyophobic surface rough structure is constructed; besides the mud pocket drilling phenomenon in the drilling process is relieved to a great extent, the abrasion and the damage in the hobbing cutter drilling process can be resisted to the greatest extent.
The application is carried out by preparing SiO 2 The PDMS mixed dispersion liquid is sprayed on the surface of a casting wedge tooth hob to prepare a super-hydrophobic coating, so that the mud pocket drilling phenomenon in the drilling process is relieved to a great extent, and the drilling efficiency is improved.
Drawings
FIG. 1 is a simplified process flow diagram of an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in figure 1, nano SiO is cast on the surface of the wedge hob 2 The preparation process of the super-hydrophobic coating comprises the following steps:
s1: with nanoscale silicon dioxide (SiO) 2 ) Sodium hydroxide and dodecyl triethoxysilane are used as raw materials to prepare the super-hydrophobic silicon dioxide nano particles; in the step, the nanometer silicon dioxide surface is modified to enable the silicon dioxide which does not have super-hydrophobicity originally to have super-hydrophobicity; compared with common super-hydrophobic materials, siO 2 The material is non-toxic, environment-friendly, stable in physical and chemical properties, and has an average Mohs hardness of 7, and can be used as a surface coating material of the wedge tooth hob to furthest resist abrasion and damage in a drilling process;
s2: taking bisaminopropyl-terminated polydimethylsiloxane (A-PDMS) as a raw material, introducing polyacyl chloride to synthesize hyperbranched PDMS, and preparing a hyperbranched PDMS solution;
s3, preparing the super-hydrophobic silicon dioxide nano particles and the super-branched PDMS solutionAs a raw material, preparing SiO 2 A PDMS mixed dispersion; the hyperbranched PDMS solution can be directly formed into a film and cured on the substrate under the condition of not adding a curing agent, so that the application property of the coating is improved; then, the super-hydrophobic silica nano particles with good weather resistance are introduced, and the aging resistance of the coating can be improved while the surface rough structure is constructed to obtain hydrophobicity;
s4: mixing SiO 2 Spraying the PDMS mixed dispersion liquid on the surface of the processed wedge tooth hob, and then heating and curing the coating, wherein the thickness of the coating is 6-12 mu m, so as to obtain the optimal hydrophobic effect;
this application is carried out by preparing SiO 2 The PDMS is mixed with the dispersion liquid, and the super-hydrophobic coating is prepared on the surface of the casting wedge tooth hob by a spraying method, so that the mud pocket drilling phenomenon in the drilling process is greatly relieved, and the drilling efficiency is improved; the slurry has very low adhesion on the surface of the super-hydrophobic coating and is easy to separate from the surface of the coating, so that the damage of the mud-coated drill on the casting wedge tooth hob can be effectively relieved.
Furthermore, the wedge hob for casting in the application is manufactured by adopting a centrifugal casting process of a bimetal composite material of high-strength wear-resistant steel and low-carbon alloy steel; among various physical and chemical preparation methods, the physical spraying method is a method of directly spraying a specific material on the surface of a workpiece to obtain a super-hydrophobic coating, and thus the physical spraying method is more suitable for the surface of a cast wedge hob with a plurality of grooves.
Further, in step S1, the preparation of the superhydrophobic silica nanoparticles includes the following steps:
weighing a certain amount of nanoscale silicon dioxide according to the required amount of the super-hydrophobic silicon dioxide nanoparticles, dispersing the nanoscale silicon dioxide in absolute ethyl alcohol (99.5%), stirring and refluxing for more than 3min at 70 ℃ to ensure that the silicon dioxide is completely dispersed, then adding sodium hydroxide to activate the silicon dioxide, finally adding dodecyl triethoxysilane into the solution, and then reacting for 5h at 70 ℃ to prepare the super-hydrophobic silicon dioxide nanoparticles;
after the reaction is finished, adding a proper amount of concentrated hydrochloric acid to adjust the pH value of the solution to be 6-7, centrifugally washing the nano particles by ethanol at the speed of 3500r/min-4500r/min at room temperature, and finally drying to obtain the super-hydrophobic silicon dioxide nano particles;
wherein, at least 50ml of ethanol is needed for dispersing 1g of nano-scale silicon dioxide per minute, the mass ratio of the nano-scale silicon dioxide to sodium hydroxide is 4: 1.2ml.
In one embodiment, 1.0g of nano-scale silicon dioxide is weighed and dissolved in 50.0ml of ethanol, stirred and refluxed for 3min at 70 ℃, then 0.25g of sodium hydroxide and 0.3ml of dodecyl triethoxysilane are sequentially added, and reacted for 5h at 70 ℃; after the reaction is finished, adjusting the pH value range to 6-7 by using concentrated hydrochloric acid, centrifugally washing the nano particles by using ethanol at the speed of 4500r/min at room temperature, and finally drying to obtain the super-hydrophobic silicon dioxide nano particles.
Further, in step S2, the preparation of the hyperbranched PDMS comprises the following steps: adding dimethyl siloxane (PDMS) and a curing agent into normal hexane, wherein the curing agent is an epoxy resin curing agent, and carrying out ultrasonic oscillation for more than 30min to fully dissolve the dimethyl siloxane (PDMS) and the curing agent, wherein the power of the ultrasonic oscillation is 200W; the mass ratio of dimethyl siloxane (PDMS) to a curing agent is 10;
in step S3, adding the super-hydrophobic silica nanoparticles into the hyperbranched PDMS solution, and performing ultrasonic oscillation for 1-2 h or longer to prepare SiO 2 The power of ultrasonic oscillation is 200W; wherein the mass ratio of the super-hydrophobic silica nanoparticles to dimethyl siloxane (PDMS) is 3 2 The mass of the PDMS mixed dispersion liquid is 10 percent.
Further, step S4, during spraying, the distance between a nozzle and the surface of the wedge tooth hob is about 15cm-20cm, the spraying time is 2S, the spraying is carried out for three times, and the time interval is 10min each time; the temperature during spraying has no strict requirement and can be realized at normal temperature; the sprayed coating can completely cover the substrate, and the mixed liquid on the surface of the wedge tooth hob is not greatly lost; plasma spraying is adopted, the optimal current, argon flow, voltage and spraying distance of the spraying are respectively 450A, 45L/min, 60V and 90mm, and the thickness of the obtained product is about 6-12 mu m under the spraying condition;
placing the sprayed wedge tooth hob in an oven, drying for 2h at 150 ℃ to completely cure polydimethylsiloxane (A-PDMS), and increasing the stability of the coating
Furthermore, before spraying, the surface of the wedge tooth hob is subjected to cleaning, deoiling, impurity removal, oxide layer removal on the surface of the hob and the like.
In practical application, a common coating applied to a drill bit is inevitably damaged by mechanical abrasion or chemical corrosion and the like due to the influence of the surrounding environment in the using process, so that the coating is aged, cracked and even dropped, and the service life of the coating is shortened; in the application, a self-repairing function is introduced on the basis of a common super-hydrophobic coating, and the coating can be restored to an original super-hydrophobic state through simple treatment after being damaged;
specifically, in step S2, the poly-acyl chloride is 1,3, 5-trimesoyl chloride (trimesoyl chloride, TMC, purity is greater than or equal to 98%), the hyperbranched PDMS is used as a flexible substrate and a low surface energy substance, a large number of hydrogen bond active sites are constructed, the self-repairing performance is facilitated to be constructed, and after inter-chain hydrogen bonds are broken, the self-repairing recovery is realized by utilizing the hydrogen bonds after simple processing; the self-repairing function is introduced on the basis of the super-hydrophobic coating, the coating can be restored to the original super-hydrophobic state through simple treatment after being damaged, and the service life of the coating is prolonged.
Performance test experiment
The super-hydrophobic surface is a surface with a static contact angle of more than 150 degrees and a rolling angle of less than 10 degrees between the surface of the coating and water, and researches show that the material has super-hydrophobic performance, and the surface of the material needs to have a multi-level micro-nano structure or a low surface energy material. In this embodiment, the performance of the hob before and after spraying the super-hydrophobic layer is tested, and the results are as follows:
| coefficient of friction | Contact angle | Surface roughness | |
| Before spraying | 0.3 | 87.5° | 1.6 |
| After spraying | 0.1 | 156.3° | 50 |
Through the upper table and can be known, after the super-hydrophobic coating is sprayed, the contact angle is 150 degrees at the time of pause and belongs to a super-hydrophobic surface, so that the adhesive force of slurry on the surface of the cast wedge tooth hob can be greatly reduced, the constructability of the hob is improved, and the wear resistance of the cast wedge tooth hob is improved to a certain extent.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the claims of this patent.
Claims (7)
1. Nano SiO on surface of casting wedge tooth hob 2 The preparation process of the super-hydrophobic coating is characterized by comprising the following steps of:
s1: with nanoscale silicon dioxide (SiO) 2 ) Sodium hydroxide and dodecyltriethylTaking oxysilane as a raw material to prepare the super-hydrophobic silicon dioxide nano particles;
s2: preparing a hyperbranched PDMS solution by taking bisaminopropyl-terminated polydimethylsiloxane (A-PDMS) as a raw material;
s3, preparing SiO by using the super-hydrophobic silica nano particles and the super-branched PDMS solution as raw materials 2 A PDMS mixed dispersion;
s4: mixing SiO 2 Spraying the PDMS mixed dispersion liquid on the surface of the processed wedge tooth hob, and then heating and curing the coating.
2. The cast wedge hob surface nano SiO of claim 1 2 The preparation process of the super-hydrophobic coating is characterized in that in the step S1, a certain amount of nano-scale silicon dioxide is weighed and completely dispersed in ethanol, sodium hydroxide and dodecyl triethoxysilane are added into an ethanol solution, the reaction is carried out for more than 5 hours at 70 ℃, then the pH value of the solution is adjusted to 6-7, ethanol is used for centrifugal washing and precipitation, and finally drying is carried out to obtain the super-hydrophobic silicon dioxide nano particles.
3. The cast wedge hob surface nano-SiO of claim 2 2 The preparation process of the super-hydrophobic coating is characterized in that at least 50ml of ethanol is needed for dispersing 1g of nano-scale silicon dioxide, the mass ratio of the nano-scale silicon dioxide to sodium hydroxide is 4: 1.2ml.
4. The nano SiO for casting wedge hob surface according to claim 1 2 The preparation process of the super-hydrophobic coating is characterized in that in the step S2, the preparation of the hyperbranched PDMS comprises the following steps: adding dimethyl siloxane (PDMS) and a curing agent into normal hexane, and carrying out ultrasonic oscillation for more than 30min to fully dissolve the dimethyl siloxane (PDMS) and the curing agent; the mass ratio of dimethyl siloxane (PDMS) to the curing agent is 10.
5. The cast wedge hob surface nano SiO of claim 1 2 Super-hydrophobic coatingThe preparation process of the layer is characterized in that in the step S3, the super-hydrophobic silicon dioxide nano particles are added into the hyperbranched PDMS solution and subjected to ultrasonic oscillation for more than 1h to prepare SiO 2 A PDMS mixed dispersion; wherein the mass ratio of the super-hydrophobic silica nanoparticles to dimethyl siloxane (PDMS) is 3 2 10% of the mass of the PDMS mixed dispersion.
6. The cast wedge hob surface nano SiO of claim 1 2 The preparation process of the super-hydrophobic coating is characterized in that in the step S4, when spraying is carried out, the distance between a nozzle and the surface of a wedge tooth hob is about 15cm-20cm, the spraying time is 2S, the spraying is carried out for three times, and the time interval of each time is 10min; plasma spraying is adopted; and heating the sprayed wedge tooth hob for 2 hours at the temperature of 150 ℃ to cure the coating.
7. The cast wedge hob surface nano SiO of claim 1 2 The preparation process of the super-hydrophobic coating is characterized in that the surface of the hob is cleaned to remove oil, impurities and a surface oxide layer before spraying.
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