Preparation method of reversible thermal discoloration reinforced resin grinding wheel and grinding wheel

Abstract

The application relates to a preparation method of a reversible thermochromic reinforced resin grinding wheel and the grinding wheel, and comprises the following steps: resin particles are heated and stirred until melted, then hard abrasive particles, magnetized carbon nanotubes and nano-aluminum trioxide are added, and a uniform mixture of an abrasive area is obtained by stirring; the uniform mixture of the abrasive area is filled into a corresponding area of a mold, a strong magnetic field is applied to guide the carbon nanotubes to be arranged in a direction, the mold is demolded after cooling and forming, a solidified body of the abrasive area of the grinding wheel is obtained; the resin particles are heated and stirred until completely melted, then nano-aluminum trioxide and reversible thermochromic microcrystals are added, and a uniform mixture of a reversible thermochromic area is obtained by stirring; the uniform mixture of the reversible thermochromic area is injected into a gap between adjacent solidified bodies of the abrasive area of the grinding wheel, and the mold is demolded after cooling to obtain a reversible thermochromic reinforced resin grinding wheel in which the solidified bodies of the abrasive area and the solidified bodies of the reversible thermochromic area are alternately distributed; and the grinding wheel prepared by the method solves the problem that overheating cannot be sensed and displayed.

Description

Technical Field

[0001] This invention relates to the field of grinding wheel technology, specifically to a method for preparing a reversible thermochromic reinforced resin grinding wheel and the grinding wheel itself. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Grinding wheels are commonly used abrasive tools in machining. Their development is closely related to the level of modern industry. On the one hand, their application has expanded to major manufacturing fields of modern processing; on the other hand, the rapid development and demand of modern new materials, in turn, promote the continuous innovation of abrasive tool preparation technology.

[0004] Patent application CN115972112A discloses a carbon nanotube nanocapsule resin grinding wheel and its preparation method. The resin grinding wheel is made by curing oil-containing carbon nanotube microcapsules, abrasive grains and phenolic resin. Compared with ordinary resin grinding wheels, the nanocapsule resin grinding wheel has higher mechanical strength and self-lubricating properties.

[0005] However, overheating is a common problem with the aforementioned resin grinding wheels during use, and it is usually difficult to directly perceive and display this in real time. This is especially true for resin grinding wheels with poor heat resistance, where the impact of temperature is even more significant. If cooling measures are not taken in time, it may negatively affect the surface finish of the machined parts and the lifespan of the grinding wheel. Therefore, a grinding wheel with high strength, good heat resistance, and the ability to directly perceive temperature changes during grinding is needed. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for preparing a reversible thermochromic reinforced resin grinding wheel and the grinding wheel itself, which overcomes the defects of existing resin grinding wheels.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] In a first aspect, embodiments of the present invention provide a method for preparing a reversible thermochromic reinforced resin grinding wheel, comprising the following steps:

[0009] After heating and stirring the resin particles until they are completely melted, hard abrasive particles, magnetized carbon nanotubes and nano-alumina particles are added. After stirring for a set time, a uniform mixture in the abrasive zone is obtained.

[0010] After the uniform mixture of abrasive zone is filled into the corresponding area of ​​the mold, a strong magnetic field is applied to guide the magnetized carbon nanotubes to be oriented and arranged. After cooling and solidification, the mold is demolded to obtain the solidified abrasive zone of the grinding wheel.

[0011] After heating and stirring the resin particles until they are completely melted, nano-alumina particles and reversible thermochromic microcrystals are added. After stirring for a set time, a uniform mixture of reversible thermochromic zones is obtained.

[0012] A uniform mixture of reversible thermochromic zones is injected into the gaps between the solidified bodies of adjacent abrasive zones in a mold. After cooling, the mold is demolded to obtain a reversible thermochromic reinforced resin grinding wheel with alternating distribution of solidified abrasive zones and reversible thermochromic solidified bodies.

[0013] Optionally, the reversible thermochromic cured body accounts for 10%-50% of the total volume of the grinding wheel.

[0014] Optionally, the resin particles are any one or more of polyimide resin, phenolic resin, epoxy resin and polyurethane resin in a set ratio.

[0015] Optionally, the hard abrasive grains are any one or more of diamond, cubic boron nitride, corundum, and silicon carbide in a set ratio.

[0016] Optionally, the magnetized carbon nanotubes have an average length of 500-2000 nm, an average diameter of 1-10 nm, and account for 0.1%-1% of the volume fraction of the solidified body in the abrasive region.

[0017] Optionally, the magnetized carbon nanotubes include carbon nanotubes coated with one or more of iron, nickel, and cobalt elements in a set ratio.

[0018] Optionally, the average diameter of the nano-alumina particles is 50-100 nm, accounting for 0.1-1% of the volume fraction of the solidified body in the abrasive zone and 0.5-2% of the volume fraction of the solidified body in the reversible thermochromic zone.

[0019] Optionally, the reversible thermochromic microcrystals consist of an outer shell and a core within the outer shell, with an average diameter of 1~10μm and accounting for 10~30% of the volume fraction of the solidified body in the reversible thermochromic region;

[0020] Optionally, the reversible thermochromic microcrystal core is composed of a leucoant, a color developer, and a solvent in a mass ratio of 1:1:10 to 1:20:100.

[0021] Furthermore, the leuco coloring agent includes any one or more of the following: thermosensitive rose red TF-R1, malachite green lactone, and crystal violet lactone, in a set ratio.

[0022] The color developer includes any one or more of p-chlorobenzoic acid, benzyl p-hydroxybenzoate, and bisphenol A in a set ratio.

[0023] Solvents include any one or more of polyethylene glycol, docosyl alcohol, and hexadecyl alcohol in a set ratio.

[0024] Secondly, embodiments of the present invention provide a reversible thermochromic reinforced resin grinding wheel, which is prepared using the reversible thermochromic reinforced resin grinding wheel preparation method described in the first aspect.

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

[0026] 1. The preparation method and grinding wheel of the present invention prepare a reversible thermochromic cured body between abrasive cured bodies. The reversible thermochromic cured body is composed of resin particles, nano-alumina particles, and reversible thermochromic microcrystals. The abrasive cured body realizes efficient intermittent grinding function, and the reversible thermochromic cured body realizes temperature indication function, solving the defect that resin grinding wheels are difficult to directly sense and display overheating phenomena in real time. At the same time, for the reversible thermochromic cured body, the nano-alumina particles enhance the mechanical properties of the substrate and improve the heat resistance and heat dissipation of the substrate. In particular, the nano-alumina particles are white, which can increase the color display of the transparent resin substrate. Therefore, the nano-alumina particles and the reversible thermochromic microcrystals synergistically enhance the temperature visibility of the reversible thermochromic area.

[0027] 2. The preparation method and grinding wheel of the present invention, for the cured body in the grinding zone, contain oriented carbon nanotubes and dispersed nano-alumina particles. The oriented carbon nanotubes and dispersed nano-alumina synergistically improve the mechanical properties of the substrate material, enhance the heat resistance and heat dissipation of the substrate, and the oriented carbon nanotubes and nano-alumina form a bearing-like laminated structure, generating a low-shear lubrication effect between the grinding wheel and the workpiece, thereby reducing interfacial friction and heat generation, and alleviating the overheating phenomenon of the resin grinding wheel. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0029] Figure 1 This is a flowchart of the preparation method in Embodiment 1 of the present invention;

[0030] Figure 2 This is a front view of the grinding wheel in Embodiment 4 of the present invention;

[0031] Figure 3 This is a partial top view of the grinding wheel in Embodiment 4 of the present invention;

[0032] Figure 4 This is a schematic diagram of the solidified abrasive zone in Embodiment 4 of the present invention;

[0033] Figure 5 This is a schematic diagram of the reversible thermochromic zone cured body of Embodiment 4 of the present invention;

[0034] Among them, 1. Abrasive zone solidified body, 2. Reversible thermochromic zone solidified body, 3. Resin substrate, 4. Hard abrasive particles, 5. Carbon nanotubes, 6. Nano-alumina particles, 7. Reversible thermochromic microcrystals. Detailed Implementation

[0035] In one typical embodiment of this application, a method for preparing a reversible thermochromic reinforced resin grinding wheel includes the following steps:

[0036] Step 1: Heat and stir the resin particles until they are completely melted to form a resin base. Then, add hard abrasive particles, magnetized carbon nanotubes and nano-alumina particles to the liquid resin base. Stir for a set time to obtain a uniform mixture in the abrasive zone.

[0037] Step 2: After filling the corresponding area of ​​the mold with the uniform mixture of abrasive zone, apply strong magnetic guidance to make the magnetized carbon nanotubes oriented and arranged. After cooling and solidification, demold to obtain the solidified abrasive zone of the grinding wheel.

[0038] Specifically, the resin particles are any one or more of polyimide resin, phenolic resin, epoxy resin and polyurethane resin in a set mass ratio. The set mass ratio can be set according to actual needs and will not be described in detail here. Preferably, the resin particles are polyimide resin particles.

[0039] The hard abrasive grains are any one or more of diamond, cubic boron nitride, corundum and silicon carbide, combined according to a set mass ratio. The set mass ratio can be set according to actual needs and will not be described in detail here. Preferably, the hard abrasive grains are diamond abrasive grains.

[0040] The magnetized carbon nanotubes have a length of 500-2000 nm, an average diameter of 1-10 nm, and account for 0.1%-1% of the volume fraction of the solidified body in the abrasive region.

[0041] The magnetized carbon nanotubes include carbon nanotubes, the surface of which is coated with one or more of the elements iron, nickel, and cobalt in a set mass ratio. The set mass ratio can be set according to actual needs and will not be described in detail here.

[0042] The average diameter of the nano-alumina particles is 50-100 nm, and they account for 0.1-1% of the volume fraction of the solidified body in the abrasive zone.

[0043] The set time is 50-70 minutes, preferably 60 minutes.

[0044] The method of applying strong magnetic guidance can be achieved using existing technology, which involves placing the mixture of the mold and the abrasive zone into a magnetic field to orient the carbon nanotubes. Further technical features will not be described in detail here.

[0045] Nano-alumina exhibits strong volume effects (small size effect), quantum size effects, and surface effects because the ratio of surface atoms to bulk atoms increases dramatically with decreasing particle size. This results in a series of superior properties in many areas, including optics, electronics, thermodynamics, and chemical reactions. Carbon nanotubes are one-dimensional nanomaterials with a unique structure, primarily composed of several to dozens of layers of coaxial cylindrical tubes arranged in hexagonal patterns of carbon atoms. As a one-dimensional nanomaterial, carbon nanotubes are lightweight, have a perfectly connected hexagonal structure, and possess many exceptional mechanical, electrical, and chemical properties.

[0046] In this embodiment, by adding oriented carbon nanotubes and dispersed nano-alumina particles to the resin substrate, the oriented carbon nanotubes and dispersed nano-alumina synergistically improve the mechanical properties of the substrate material, enhance the heat resistance and heat dissipation of the matrix, and the oriented carbon nanotubes and nano-alumina form a bearing-like laminated structure, generating a low-shear lubrication effect between the grinding wheel and the workpiece, thereby reducing interfacial friction and heat generation, and alleviating the overheating phenomenon of the resin grinding wheel.

[0047] Step 3: After heating and stirring the resin particles until they are completely melted, add nano-alumina particles and reversible thermochromic microcrystals, and stir for a set time to obtain a uniform mixture of the reversible thermochromic zone.

[0048] Step 4: Inject the uniform mixture of the reversible thermochromic zone into the gap between the solidified bodies of the adjacent abrasive zones of the mold. After cooling, demold to obtain a reversible thermochromic reinforced resin grinding wheel with alternating distribution of solidified abrasive zones and reversible thermochromic solidified bodies.

[0049] The reversible thermochromic cured body accounts for 10%-50% of the total volume of the grinding wheel.

[0050] The resin particles are any one or more of polyimide resin, phenolic resin, epoxy resin and polyurethane resin in a set mass ratio. The set mass ratio can be set according to actual needs and will not be described in detail here.

[0051] The average diameter of the nano-alumina particles is 50-100 nm, and they account for 0.5-2% of the volume fraction of the solidified body in the reversible thermochromic zone.

[0052] The reversible thermochromic microcrystals consist of an outer shell and a core inside the outer shell. The average diameter of the reversible thermochromic microcrystals is 1~10μm, and they account for 10~30% of the volume fraction of the solidified body in the reversible thermochromic region.

[0053] The reversible thermochromic microcrystal core is composed of a leuco agent, a color developer, and a solvent, with a mass ratio of 1:1:10 to 1:20:100.

[0054] Furthermore, the leuco coloring agent includes any one or more of the following: thermosensitive rose red TF-R1, malachite green lactone, and crystal violet lactone, combined according to a set mass ratio. The set mass ratio can be set according to actual needs and will not be described in detail here.

[0055] The color developer includes any one or more of p-chlorobenzoic acid, benzyl p-hydroxybenzoate, and bisphenol A, combined according to a set mass ratio. The set mass ratio can be set according to actual needs, and will not be described in detail here.

[0056] Solvents include any one or more of polyethylene glycol, docosyl alcohol, and hexadecyl alcohol, combined according to a set mass ratio. The set mass ratio can be set according to actual needs and will not be described in detail here.

[0057] The set time is 50-70 minutes, preferably 60 minutes.

[0058] Reversible thermochromic microcrystals, as a type of thermochromic material, exhibit changes in their absorption spectrum during heating and cooling, thus displaying characteristics where their transmittance or color changes with temperature.

[0059] In this embodiment, a reversible thermochromic cured body is prepared between the abrasive cured bodies. The reversible thermochromic cured body is composed of resin particles, nano-alumina particles, and reversible thermochromic microcrystals. The abrasive cured body realizes efficient intermittent grinding function, and the reversible thermochromic cured body realizes temperature indication function, which solves the defect that resin grinding wheels cannot directly sense and display overheating phenomena in real time. At the same time, for the reversible thermochromic cured body, the nano-alumina particles enhance the mechanical properties of the substrate and improve the heat resistance and heat dissipation of the substrate. In particular, the nano-alumina particles are white, which can increase the color display of the transparent resin substrate. Therefore, the nano-alumina particles and the reversible thermochromic microcrystals synergistically enhance the temperature visibility of the reversible thermochromic area.

[0060] Example 1:

[0061] This embodiment provides a method for preparing a reversible thermochromic reinforced resin grinding wheel, such as... Figure 1 As shown, it includes the following steps:

[0062] Step 1: Take an appropriate amount of polyimide resin particles, heat and stir until the resin particles are completely melted, then add diamond hard abrasive particles, magnetize and arrange carbon nanotubes and nano aluminum oxide particles and continue stirring for 1 hour to obtain a uniform mixture in the abrasive zone.

[0063] Step 2: Fill the abrasive zone uniform mixture into the abrasive zone mold, and form oriented carbon nanotubes under strong magnetic guidance. After cooling and solidification, demold to obtain the solidified body of the grinding wheel abrasive zone.

[0064] The nano-alumina particles have an average diameter of 50 nm and account for 0.5% of the volume fraction of the solidified body in the abrasive zone; the magnetized carbon nanotubes have an average length of 500 nm and an average diameter of 1 nm and account for 0.5% of the volume fraction of the solidified body in the abrasive zone; the surface of the magnetized carbon nanotubes is coated with iron.

[0065] The amount of polyimide resin granules used can be set according to actual needs, and will not be described in detail here.

[0066] Step 3: Take an appropriate amount of polyimide resin particles, heat and stir until the resin particles are completely melted, then add nano aluminum oxide particles and reversible thermochromic microcrystals and continue stirring for 1 hour to obtain a uniform mixture of reversible thermochromic zones.

[0067] Step 4: Place the abrasive zone solidified body prepared in Step 2 into the mold, fill the gap between adjacent abrasive zone solidified bodies in the mold with the reversible thermochromic zone uniform mixture, and demold after cooling and molding to obtain a reversible thermochromic reinforced resin grinding wheel with alternating distribution of abrasive zone solidified body and reversible thermochromic zone solidified body.

[0068] The volume of the reversible thermochromic zone solidified body accounts for 25% of the total volume of the grinding wheel. The average diameter of the nano-alumina particles is 50 nm, which accounts for 0.5% of the volume fraction of the reversible thermochromic zone solidified body. The average diameter of the reversible thermochromic microcrystals is 2 μm, which accounts for 10% of the volume fraction of the reversible thermochromic zone solidified body.

[0069] The reversible thermochromic microcrystal core is composed of the leucocyanide thermosensitive rose red TF-R1, the color developer p-chlorobenzoic acid, and the solvent cetyl alcohol, with a mass ratio of 1:1:10.

[0070] Example 2

[0071] This embodiment provides a method for preparing a reversible thermochromic reinforced resin grinding wheel, which differs from Embodiment 1 only in that:

[0072] In step 1, the resin substrate of the abrasive zone is phenolic resin particles, the surface of the magnetized carbon nanotubes is coated with nickel, and the volume fraction of nano-alumina particles in the solidified body of the abrasive zone is 1%; the volume fraction of magnetized carbon nanotubes in the solidified body of the abrasive zone is 1%.

[0073] In step 3, the volume fraction of nano-alumina particles in the reversible thermochromic zone solidified body is 1%, and the volume fraction of reversible thermochromic microcrystals in the reversible thermochromic zone solidified body is 20%.

[0074] In step 4, the resin substrate of the reversible thermochromic zone is epoxy resin particles, and the volume of the reversible thermochromic zone accounts for 50% of the total volume of the grinding wheel. The reversible thermochromic microcrystal core is composed of leucocyanide crystal violet lactone, chromogenic agent bisphenol A and solvent polyethylene glycol, with a mass ratio of 1:5:30.

[0075] Example 3

[0076] This embodiment provides a method for preparing a reversible thermochromic reinforced resin grinding wheel. Compared with Embodiment 1, the only difference is that the cured body in the reversible thermochromic zone accounts for 10% of the total volume of the grinding wheel.

[0077] Example 4

[0078] This embodiment provides a reversible thermochromic reinforced resin grinding wheel, which is prepared using the preparation method described in Embodiment 1, Embodiment 2, or Embodiment 3, and includes an alternating abrasive zone cured body 1 and a reversible thermochromic zone cured body 2.

[0079] The abrasive zone solidified body includes a resin substrate 3, within which are hard abrasive particles 4, directionally arranged carbon nanotubes 5, and diffusely distributed nano-alumina particles 6.

[0080] The reversible thermochromic zone cured body 2 includes a resin substrate 3, in which nano-alumina particles 6 and reversible thermochromic microcrystals 7 are dispersedly distributed.

[0081] The grinding wheel of this embodiment allows for the selection of larger processing parameters compared to conventional resin grinding wheels to improve processing efficiency, and its working temperature can be directly perceived so that appropriate cooling measures can be taken.

[0082] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preparing a reversible thermochromic reinforced resin grinding wheel, characterized in that, Includes the following steps: After heating and stirring the resin particles until they are completely melted, hard abrasive particles, magnetized carbon nanotubes and nano-alumina particles are added. After stirring for a set time, a uniform mixture in the abrasive zone is obtained. After the uniform mixture of abrasive zone is filled into the corresponding area of ​​the mold, a strong magnetic field is applied to guide the magnetized carbon nanotubes to be oriented and arranged. After cooling and solidification, the mold is demolded to obtain the solidified abrasive zone of the grinding wheel. After heating and stirring the resin particles until they are completely melted, nano-alumina particles and reversible thermochromic microcrystals are added. After stirring for a set time, a uniform mixture of reversible thermochromic zones is obtained. A uniform mixture of reversible thermochromic zones is injected into the gaps between the solidified bodies of adjacent abrasive zones in a mold. After cooling, the mold is demolded to obtain a reversible thermochromic reinforced resin grinding wheel with alternating distribution of solidified abrasive zones and reversible thermochromic solidified bodies.

2. The method for preparing a reversible thermochromic reinforced resin grinding wheel as described in claim 1, characterized in that, The reversible thermochromic cured body accounts for 10%-50% of the total volume of the grinding wheel.

3. The method for preparing a reversible thermochromic reinforced resin grinding wheel as described in claim 1, characterized in that, The resin particles are any one or more of polyimide resin, phenolic resin, epoxy resin and polyurethane resin in a set ratio.

4. The method for preparing a reversible thermochromic reinforced resin grinding wheel as described in claim 1, characterized in that, The hard abrasive grains are any one or more of diamond, cubic boron nitride, corundum and silicon carbide, combined in a set ratio.

5. The method for preparing a reversible thermochromic reinforced resin grinding wheel as described in claim 1, characterized in that, The magnetized carbon nanotubes have a length of 500-2000 nm, an average diameter of 1-10 nm, and account for 0.1%-1% of the volume fraction of the solidified body in the abrasive region.

6. The method for preparing a reversible thermochromic reinforced resin grinding wheel as described in claim 1, characterized in that, The magnetized carbon nanotubes include carbon nanotubes, the surface of which is coated with any one or more of iron, nickel, and cobalt elements in a set ratio.

7. The method for preparing a reversible thermochromic reinforced resin grinding wheel as described in claim 1, characterized in that, The average diameter of the nano-alumina particles is 50-100 nm, accounting for 0.1-1% of the volume fraction of the solidified body in the abrasive zone and 0.5-2% of the volume fraction of the solidified body in the reversible thermochromic zone.

8. The method for preparing a reversible thermochromic reinforced resin grinding wheel as described in claim 1, characterized in that, The reversible thermochromic microcrystal consists of an outer shell and a core inside the outer shell. The average diameter of the reversible thermochromic microcrystal is 1 to 10 μm, and it accounts for 10 to 30% of the volume fraction of the solidified body in the reversible thermochromic region.

9. The method for preparing a reversible thermochromic reinforced resin grinding wheel as described in claim 1, characterized in that, The reversible thermochromic microcrystal core is composed of a leuco agent, a color developer, and a solvent, with a mass ratio of 1:1:10 to 1:20:

100. Furthermore, the leuco coloring agent includes any one or more of the following: thermosensitive rose red TF-R1, malachite green lactone, and crystal violet lactone, in a set ratio. The color developer includes any one or more of p-chlorobenzoic acid, benzyl p-hydroxybenzoate, and bisphenol A in a set ratio. Solvents include any one or more of polyethylene glycol, docosyl alcohol, and hexadecyl alcohol in a set ratio.

10. A reversible thermochromic reinforced resin grinding wheel, characterized in that, It is prepared by the method for preparing reversible thermochromic reinforced resin grinding wheels according to any one of claims 1-9.

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