Pouring curing molding high-wear-resistance grinding wheel and preparation method thereof

Abstract

The invention relates to the technical field of grinding wheels, and discloses a high-wear-resistance grinding wheel formed through pouring and curing and a preparation method thereof. Fluorine modified polyimide epoxy resin is used as a basis, organic silicon modified polyurethane is added to obtain a resin binder, diamond is used as a main abrasive material, cryolite is added, and the high-wear-resistance grinding wheel is obtained through a casting molding method. The polyimide epoxy resin has good heat resistance and corrosion resistance, and fluorine is introduced to enhance the intermolecular interaction, so that the thermal stability, hardness, wear resistance and corrosion resistance of the material are improved, and the service life of the material is prolonged; organosilicone modified polyurethane and polyimide epoxy resin can form a more compact cross-linked network, the material is endowed with good mechanical properties and weather resistance, Si-O bonds and organic side chains in the material can significantly reduce the surface energy of the material, and the material is endowed with good hydrophobicity; and cryolite is added, so that the grinding temperature can be effectively reduced during grinding wheel operation, the grinding speed is increased, and stable grinding performance is maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding wheels, and particularly relates to a high-wear-resistant grinding wheel formed by casting and curing and a preparation method thereof. Background Art

[0002] With the development of modern manufacturing towards high precision, high efficiency, and high reliability, the requirements for grinding processing are also getting higher and higher, and traditional grinding wheels are gradually difficult to meet the needs.

[0003] When traditional grinding wheels grind high-hardness materials or perform long-term and high-intensity grinding, the abrasives wear quickly, resulting in a shortened service life of the grinding wheel, frequent replacement of the grinding wheel, increased production costs, and reduced production efficiency. Moreover, the bonding strength between the binder used in ordinary grinding wheels and the abrasives is relatively low, and the abrasives are prone to falling off during the grinding process, which not only reduces the grinding performance of the grinding wheel but also affects the quality and accuracy of the surface of the machined workpiece. During high-speed grinding, a large amount of heat is generated, and the heat dissipation performance of ordinary grinding wheels is poor, which will cause the temperature of the grinding wheel to rise, thereby affecting the wear resistance and machining accuracy of the grinding wheel, and even may cause safety problems such as the rupture of the grinding wheel.

[0004] High-wear-resistant grinding wheels have the characteristics of high grinding efficiency, high machining accuracy, and strong wear resistance, and are widely used in fields such as metal processing, stone and glass processing, and mechanical manufacturing. The Chinese patent application with the publication number CN 104440603 A discloses a high-wear-resistant ceramic grinding wheel, which includes components such as kyanite, albite, bentonite, calcium carbonate, and high-aluminum cement. The grinding wheel has good wear resistance, high hardness, can withstand strong impact force, and has good adhesion of particles. Components such as bentonite in the formula can play a toughening role, but the brittleness of the ceramic grinding wheel itself is relatively high due to its characteristics, and it is prone to phenomena such as rupture and chipping when subjected to large impact or stress concentration. For example, during high-speed grinding, if hard particles on the surface of the workpiece or sudden collisions are encountered, the grinding wheel may be locally broken, affecting the grinding effect and even causing the grinding wheel to be scrapped. The Chinese patent application with the publication number CN 109227421 A discloses a wear-resistant grinding wheel and a preparation method thereof, which includes components such as brown fused alumina abrasive, boron nitride, borate glass powder, phenolic resin, and polytetrafluoroethylene. The grinding wheel has good wear resistance, long service life, is easy to use, and has less waste chips during use. However, the phenolic resin in the components will undergo thermal decomposition and carbonization at high temperatures, reducing the bonding strength with the abrasives, causing the abrasives to fall off prematurely, and affecting the service life and grinding performance of the grinding wheel. Summary of the Invention

[0005] The present invention aims to provide a high-wear-resistant grinding wheel formed by casting and curing and a preparation method thereof, and the grinding wheel has strong wear resistance, chemical corrosion resistance, high-temperature resistance, and mechanical properties.

[0006] To achieve the above object, the present invention provides a casting and curing high wear-resistant grinding wheel, which comprises an epoxy resin binder, an inorganic abrasive mixture and auxiliary materials; the epoxy resin binder is obtained by copolymerizing fluorine-modified polyimide epoxy resin and silicone-modified polyurethane; the mass ratio of the fluorine-modified polyimide epoxy resin to the silicone-modified polyurethane is 1:(0.5 - 0.8); the mass ratio of the epoxy resin binder, the inorganic abrasive mixture and the auxiliary materials is 1:(0.8 - 1.2):(0.2 - 0.6).

[0007] The structural formula of the fluorine-modified polyimide epoxy resin is as follows:

[0008]

[0009] Wherein, n in the structure takes an integer value between 1 and 10; the structural formula of the silicone-modified polyurethane is as follows:

[0010]

[0011] Wherein, m takes an integer value between 1 and 10.

[0012] The present invention also provides a preparation method of a casting and curing high wear-resistant grinding wheel, comprising:

[0013] Step S1: Dissolve 4,4'-(hexafluoroisopropylidene) diphthalic anhydride and 4,4'-diaminodiphenyl ether in a first solvent, obtain a polyamic acid prepolymer through a first reaction, add acetic anhydride, and obtain a fluorine-modified polyimide through a second reaction;

[0014] Step S2: Dissolve the fluorine-modified polyimide and bisphenol A epoxy resin in a first solvent, add a catalyst, and react to obtain a fluorine-modified polyimide epoxy resin;

[0015] Step S3: Dissolve isophorone diisocyanate, propylene glycol and amino-terminated polysiloxane in a second solvent, add a chain extender and a catalyst, and react to obtain a silicone-modified polyurethane;

[0016] Step S4: Mix the fluorine-modified polyimide epoxy resin and the silicone-modified polyurethane, copolymerize to obtain an epoxy resin binder, add an inorganic abrasive mixture and auxiliary materials, and stir to obtain a high wear-resistant grinding wheel material;

[0017] Step S5: Preheat a grinding wheel mold, pour in the high wear-resistant grinding wheel material, cure at room temperature, and demold to obtain a high wear-resistant grinding wheel.

[0018] Preferably, the first solvent is any one or more of N,N'-dimethylformamide and N-methyl-2-pyrrolidone.

[0019] Preferably, the second solvent is any one or more of dimethyl sulfoxide, tetrahydrofuran, and acetone.

[0020] Preferably, in step S1, the first reaction temperature is 0 to 5 °C, and the reaction time is 10 to 15 h.

[0021] Preferably, in step S1, the second reaction temperature is 120 to 180 °C, and the reaction time is 7 to 10 h.

[0022] Preferably, in step S1, the mass ratio of 4,4'-diaminodiphenyl ether, 4,4'-(hexafluoroisopropylidene)diphthalic anhydride, acetic anhydride, and the first solvent is 1:(1.1 - 1.5):(0.1 - 0.4):(4 - 5).

[0023] Preferably, in step S2, the catalyst is any one or more of triethylamine and 2-methylimidazole.

[0024] Preferably, in step S2, the reaction temperature is 80 to 120 °C, and the reaction time is 1 to 3 h.

[0025] Preferably, in step S2, the mass ratio of bisphenol A epoxy resin, fluorine-modified polyimide, catalyst, and the first solvent is 1:(0.2 - 0.5):(0.01 - 0.05):(4 - 5).

[0026] Preferably, in step S3, the chain extender is any one or more of 1,4-butanediol and ethylene glycol.

[0027] Preferably, in step S3, the catalyst is any one or more of stannous octoate and triethylenediamine.

[0028] Preferably, in step S3, the mass ratio of polypropylene glycol, isophorone diisocyanate, amino-terminated polysiloxane, chain extender, catalyst, and the second solvent is 1:(1 - 1.2):(0.1 - 0.3):(0.01 - 0.03):(0.02 - 0.05):(4 - 5).

[0029] Preferably, in step S3, the reaction temperature is 80 to 120 °C, and the reaction time is 8 to 12 h.

[0030] Preferably, in step S4, the copolymerization temperature is 60 to 120 °C, and the copolymerization time is 1 to 5 h.

[0031] Preferably, in step S4, the stirring temperature is 50 to 80 °C, and the stirring time is 1 to 3 h.

[0032] Preferably, in the step S5, the preheating temperature of the grinding wheel mold is 150 - 300 °C.

[0033] Preferably, in the step S5, the dosage of the high wear-resistant grinding wheel material is 60 - 100 g.

[0034] Preferably, in the step S5, the warm curing time is 24 - 48 h.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] (1) The present invention is based on fluorine-modified polyimide epoxy resin and copolymerizes with silicone-modified polyurethane to prepare a resin binder. The introduction of fluorine enhances the cross-linked structure formed by polyimide and bisphenol A epoxy resin, and at the same time enhances the intermolecular interaction. At the same time, the thermal decomposition temperature and glass transition temperature are both increased, and the coefficient of thermal expansion is decreased, making the material have better dimensional stability when the temperature changes, reducing problems such as stress cracking caused by thermal expansion and contraction, and further enabling the material to maintain stable performance in a higher temperature environment. The silicone-modified polyurethane can form a more complex network structure with the polyimide epoxy resin. The amino group in the silicone-modified polyurethane can react with groups such as epoxy groups and hydroxyl groups in the polyimide epoxy resin to form new chemical bonds. The alkoxy groups on the silicon atoms in the siloxane can also undergo a de-alcohol reaction with the hydroxyl groups in the epoxy resin to generate silicon-oxygen bonds and alcohols, increasing the cross-linking density of the polymer and improving its mechanical properties. The polysiloxane chain segments can undergo a certain degree of orientation and deformation, absorbing more energy, enabling the material to withstand greater stress without fracture; at the same time, the polysiloxane chain segments also have good flexibility, which can significantly improve the flexibility and elasticity of the material in a low-temperature environment. In cold regions, the material can also maintain good flexibility and sealing performance and is not easily hardened and embrittled due to low temperature.

[0037] (2) The present invention uses a mixture of diamond, white corundum, silicon carbide and dolomite as abrasives and adds cryolite as an auxiliary material, and the obtained grinding wheel has good grinding performance and high wear resistance; among them, the thermal conductivity of cryolite is relatively low, and during the friction process between the grinding wheel and the workpiece, it can hinder the conduction of heat. At the same time, cryolite will chemically react with the surface of the material to be ground to generate substances with lubricating effects and low melting points, reducing the generation of frictional heat, further reducing the friction force and friction temperature. Cryolite will undergo partial decomposition at high temperatures, and the generated fluoride ions, etc. can form volatile or easily discharged compounds with some metal elements in the grinding debris, avoiding the accumulation of grinding debris on the surface of the grinding wheel; and cryolite can also promote the fusion between the resin and the abrasives, reducing defects such as burns and cracks on the surface of the workpiece, ensuring the overall performance of the grinding wheel, and improving the grinding efficiency and processing quality. Description of the Drawings

[0038] Figure 1 It is a preparation flow chart of a cast-cured high-wear-resistant grinding wheel.

[0039] Figure 2 It is a synthesis route diagram of fluorine-modified polyimide epoxy resin.

[0040] Figure 3 It is a synthesis route diagram of silicone-modified polyurethane.

[0041] Figure 4 It is a physical picture of a cast-cured high-wear-resistant grinding wheel. Specific implementation manners

[0042] The following examples are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

[0043] The main compounds used in the examples and comparative examples are all commercially available products and have not been subjected to any further purification treatment.

[0044] Example 1

[0045] As Figure 1 shown, a cast-cured high-wear-resistant grinding wheel, and its preparation method includes the following steps:

[0046] Step S1: Weigh 10 g of 4,4'-diaminodiphenyl ether and 11 g of 4,4'-(hexafluoroisopropylidene) diphthalic anhydride, add them to 40 g of N,N'-dimethylformamide for dissolution, react at 0 °C for 15 h to obtain a prepolymer, add 1 g of acetic anhydride, and react at 120 °C for 10 h to obtain fluorine-modified polyimide.

[0047] Step S2: Weigh 2 g of fluorine-modified polyimide and 10 g of bisphenol A epoxy resin, add them to 40 g of N,N'-dimethylformamide for dissolution, add 0.1 g of 2-methylimidazole, and react at 80 °C for 3 h to obtain fluorine-modified polyimide epoxy resin, as Figure 2 shown.

[0048] Step S3: Weigh 10 g of isophorone diisocyanate, 10 g of propylene glycol and 1 g of amino-terminated polysiloxane, add them to 40 g of tetrahydrofuran for dissolution, add 0.1 g of ethylene glycol and 0.2 g of triethylenediamine, and react at 80 °C for 12 h to obtain silicone-modified polyurethane, as Figure 3 shown.

[0049] Step S4: Weigh 10 g of diamond, 2 g of white corundum, 2 g of silicon carbide and 1 g of dolomite, and mix them evenly to obtain an inorganic abrasive mixture; Take 10 g of fluorine-modified polyimide epoxy resin and 5 g of organosilicon-modified polyurethane, copolymerize them at 60 °C for 5 h to obtain an epoxy resin binder; Take 10 g of the epoxy resin binder, add 8 g of the inorganic abrasive mixture and 2 g of cryolite, stir at 50 °C for 3 h to obtain a high-wear-resistant grinding wheel material.

[0050] Step S5: Preheat the grinding wheel mold to 150 °C, pour in 60 g of the high-wear-resistant grinding wheel material, cure it at room temperature for 24 h, and demold it to obtain a high-wear-resistant grinding wheel, as Figure 4 shown.

[0051] Example 2

[0052] As Figure 1 shown, a casting and curing molded high-wear-resistant grinding wheel, its preparation method includes the following steps:

[0053] Step S1: Weigh 10 g of 4,4'-diaminodiphenyl ether and 13 g of 4,4'-(hexafluoroisopropylidene) diphthalic anhydride, add them to 45 g of N,N'-dimethylformamide to dissolve, react at 3 °C for 13 h to obtain a polyamic acid prepolymer, add 2.5 g of acetic anhydride, react at 150 °C for 8 h to obtain a fluorine-modified polyimide.

[0054] Step S2: Weigh 3.5 g of fluorine-modified polyimide and 10 g of bisphenol A type epoxy resin, add them to 45 g of N,N'-dimethylformamide to dissolve, add 0.3 g of 2-methylimidazole, react at 100 °C for 2 h to obtain a fluorine-modified polyimide epoxy resin, as Figure 2 shown.

[0055] Step S3: Weigh 11 g of isophorone diisocyanate, 10 g of polypropylene glycol and 2 g of amino-terminated polysiloxane, add them to 45 g of tetrahydrofuran to dissolve, add 0.2 g of ethylene glycol and 0.35 g of triethylenediamine, react at 100 °C for 10 h to obtain an organosilicon-modified polyurethane, as Figure 3 shown.

[0056] Step S4: Weigh 10 g of diamond, 3 g of white corundum, 3 g of silicon carbide and 2 g of dolomite, and mix them evenly to obtain an inorganic abrasive mixture; Take 10 g of fluorine-modified polyimide epoxy resin and 6.5 g of organosilicon-modified polyurethane, copolymerize them at 90 °C for 2 h to obtain an epoxy resin binder; Take 10 g of the epoxy resin binder, add 10 g of the inorganic abrasive mixture and 4 g of cryolite, stir at 65 °C for 2 h to obtain a high-wear-resistant grinding wheel material.

[0057] Step S5: Preheat the grinding wheel mold to 220 °C, pour in 80 g of the high-wear-resistant grinding wheel material, cure it at room temperature for 36 h, and demold it to obtain a high-wear-resistant grinding wheel, asFigure 4 as shown

[0058] Example 3

[0059] As Figure 1 shown, a casting and curing high wear-resistant grinding wheel, and its preparation method includes the following steps:

[0060] Step S1: Weigh 10 g of 4,4'-diaminodiphenyl ether and 15 g of 4,4'-(hexafluoroisopropylidene) diphthalic anhydride, add them to 50 g of N,N'-dimethylformamide for dissolution, react at 5 °C for 10 h to obtain a polyamic acid prepolymer, add 4 g of acetic anhydride, and react at 180 °C for 7 h to obtain a fluorine-modified polyimide.

[0061] Step S2: Weigh 5 g of fluorine-modified polyimide and 10 g of bisphenol A epoxy resin, add them to 50 g of N,N'-dimethylformamide for dissolution, add 0.5 g of 2-methylimidazole, and react at 120 °C for 1 h to obtain a fluorine-modified polyimide epoxy resin, as Figure 2 shown

[0062] Step S3: Weigh 12 g of isophorone diisocyanate, 10 g of polypropylene glycol, and 3 g of amino-terminated polysiloxane, add them to 50 g of tetrahydrofuran for dissolution, add 0.3 g of ethylene glycol and 0.5 g of triethylenediamine, and react at 120 °C for 8 h to obtain an organosilicon-modified polyurethane, as Figure 3 shown

[0063] Step S4: Weigh 10 g of diamond, 4 g of white corundum, 5 g of silicon carbide, and 3 g of dolomite, mix them evenly to obtain an inorganic abrasive mixture; take 10 g of fluorine-modified polyimide epoxy resin and 8 g of organosilicon-modified polyurethane, copolymerize at 120 °C for 1 h to obtain an epoxy resin binder; take 10 g of epoxy resin binder, add 12 g of inorganic abrasive mixture and 6 g of cryolite, stir at 80 °C for 1 h to obtain a high wear-resistant grinding wheel material.

[0064] Step S5: Preheat the grinding wheel mold to 300 °C, pour in 100 g of high wear-resistant grinding wheel material, cure at room temperature for 48 h, and demold to obtain a high wear-resistant grinding wheel, as Figure 4 shown

[0065] Comparative Example 1

[0066] A casting and curing high wear-resistant grinding wheel, the difference between its preparation method and that of Example 2 is that 4,4'-(hexafluoroisopropylidene) diphthalic anhydride is not added in step S1.

[0067] Comparative Example 2

[0068] A casting and curing high wear-resistant grinding wheel, the difference between its preparation method and that of Example 2 is that amino-terminated polysiloxane is not added in step S3.

[0069] Comparative Example 3

[0070] A kind of casting and curing high - wear - resistant grinding wheel, the difference between its preparation method and that of Example 2 is that cryolite is not added in step S4.

[0071] Performance test: Test the grinding performance, wear resistance and weather resistance of the high - wear - resistant grinding wheels prepared in Examples 1 - 3 and Comparative Examples 1 - 3.

[0072] (1) Grinding performance and wear resistance test: Use the grinding wheels prepared in Examples 1 - 3 and Comparative Examples 1 - 3 to grind on an alumina ceramic tube with a purity of 99%. The grinding amount is 5 mm, the grinding wheel speed is 4000 r / min, the axial feed speed is 100 mm / min, and the radial feed speed is 0.02 mm / r. Record the grinding time of the grinding wheels in Examples 1 - 3 and Comparative Examples 1 - 3, the surface roughness of the alumina ceramic tube, and the outer diameter wear amount.

[0073] (2) Weather resistance test:

[0074] High - temperature environment: Put the grinding wheel into a high - temperature test chamber at 100 °C for 24 - 48 h, observe the appearance, test the hardness of the grinding wheel with a Rockwell hardness tester, and test the impact resistance strength of the grinding wheel with an impact testing machine.

[0075] Low - temperature environment: Put the grinding wheel into a low - temperature test chamber at - 40 °C for 24 - 48 h, observe the appearance, test the hardness of the grinding wheel with a Rockwell hardness tester, and test the impact resistance strength of the grinding wheel with an impact testing machine.

[0076] Humid environment: Put the grinding wheel into a humidity test chamber with a humidity of 90% and a temperature of 25 °C for 7 - 28 d, observe the appearance of the grinding wheel, test the hardness of the grinding wheel with a Rockwell hardness tester, and test the impact resistance strength of the grinding wheel with an impact testing machine.

[0077] Table 1 Test data of grinding performance and wear resistance of the grinding wheel

[0078]

[0079]

[0080] According to the data in Table 1, for the grinding wheels prepared in Examples 1-3 and Comparative Examples 1-3, when grinding alumina ceramic tubes under the same conditions with a grinding amount of 5 mm, the time required for the grinding wheels prepared in Examples 1-3 is shorter, all within 15 minutes, and the surface roughness Ra of the alumina ceramic tubes after grinding is lower than 0.15 μm. Experiments prove that the grinding performance of the grinding wheels prepared in Examples 1-3 is superior to that of the grinding wheels prepared in Comparative Examples 1-3. This is because the grinding wheels prepared in Examples 1-3 use fluorine-modified polyimide epoxy resin, and the resin obtained by adding organosilicon-modified polyurethane copolymer as the binder of the grinding wheel, with diamond as the main abrasive. The resin binder itself has good mechanical properties and good compatibility with the abrasive. The prepared grinding wheel has good self-sharpening property and improves the grinding efficiency; cryolite is added to the grinding wheels prepared in Examples 1-3. During the friction process between the grinding wheel and the workpiece, cryolite can reduce the generation of frictional heat, lower the temperature, and prevent the surface of the polished workpiece from being burned and damaged. The wear amount of the outer diameter of the alumina ceramic tubes after grinding by the grinding wheels prepared in Examples 1-3 is lower than that of the grinding wheels prepared in Comparative Examples 1-3. Experiments prove that the wear resistance of the grinding wheels prepared in Examples 1-3 is superior to that of the grinding wheels prepared in Comparative Examples 1-3.

[0081] Table 2 Performance test data of grinding wheels under high-temperature environment

[0082]

[0083] According to the data in Table 2, when the grinding wheels prepared in Examples 1-3 are placed at 100 °C for 24-48 h, their Rockwell hardness is above 85, and the impact strength is above 20 J / cm 2 above, while for the grinding wheels prepared in Comparative Examples 1-3, after being placed at 100 °C for 24-48 h, both the hardness and the impact strength are lower than those of Examples 1-3, and among them, Comparative Example 1 is significantly lower than the others. This is because the resin binder used in the grinding wheel prepared in Comparative Example 2 does not introduce fluorine element. Fluorine element can endow the resin with good high-temperature resistance, effectively increase its thermal decomposition temperature and glass transition temperature, and reduce the thermal expansion coefficient, enabling the grinding wheel to maintain good mechanical properties in a high-temperature environment. Therefore, the hardness and impact strength of the grinding wheel prepared in Comparative Example 2 at high temperature are lower.

[0084] Table 3 Performance test data of grinding wheels under low-temperature environment

[0085]

[0086] According to the data in Table 3, when the grinding wheels prepared in Examples 1-3 are placed at -40 °C for 24-48 h, their Rockwell hardness is above 85, and the impact strength is above 20 J / cm 2Above, for the grinding wheels prepared in Comparative Examples 1 to 3, under this environment, both the hardness and the impact resistance are lower than those of Examples 1 to 3. Among them, the grinding wheel prepared in Comparative Example 2 is significantly lower than others. This is because the polydimethylsiloxane chain segment is not introduced into the grinding wheel prepared in Comparative Example 2. The polydimethylsiloxane chain segment can significantly improve the flexibility and elasticity of the material in a low-temperature environment. In cold regions, the material can also maintain good flexibility and sealing performance and is not easily hardened and embrittled due to low temperature. Therefore, the grinding wheel prepared in Comparative Example 2 has lower hardness and impact resistance in a low-temperature environment.

[0087] Table 4 Performance test data of grinding wheels in a humid environment

[0088]

[0089] According to the data in Table 4, when the grinding wheels prepared in Examples 1 to 3 are placed in a humid environment for 24 to 48 hours, their hardness remains above 85, and their impact resistance is above 20 J / cm 2 Above. The hardness and impact resistance of the grinding wheel prepared in Comparative Example 2 are relatively poor in this environment. This is because the Si-O bond and the organic side chain are not introduced into the grinding wheel prepared in Comparative Example 2. The Si-O bond can significantly reduce the surface energy of the material and endow it with good hydrophobicity, enabling the material to maintain its hardness and impact resistance in a humid environment.

[0090] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A casting and curing formed high wear-resistant grinding wheel, characterized in that, It includes an epoxy resin binder, an inorganic abrasive mixture and auxiliary materials; the epoxy resin binder is obtained by copolymerizing fluorine-modified polyimide epoxy resin and silicone-modified polyurethane; the mass ratio of the fluorine-modified polyimide epoxy resin to the silicone-modified polyurethane is 1:(0.5 - 0.8); the mass ratio of the epoxy resin binder, the inorganic abrasive mixture and the auxiliary materials is 1:(0.8 - 1.2):(0.2 - 0.6). The structural formula of the fluorine-modified polyimide epoxy resin is as follows: Wherein, n in the structure takes an integer value between 1 and 10; the structural formula of the silicone-modified polyurethane is as follows: Wherein, m takes an integer value between 1 and 10.

2. The high-wear-resistant grinding wheel formed by casting and curing according to claim 1, wherein The inorganic abrasive mixture includes diamond, white fused alumina, silicon carbide and dolomite; the auxiliary material is cryolite; the mass ratio of diamond, white fused alumina, silicon carbide and dolomite is 1:(0.2 - 0.4):(0.2 - 0.5):(0.1 - 0.3).

3. The preparation method of a casting and curing high wear-resistant grinding wheel according to claim 1 or 2, characterized in that, It includes: Step S1: Dissolve 4,4'-(hexafluoroisopropylidene) diphthalic anhydride and 4,4'-diaminodiphenyl ether in a first solvent, obtain a polyamic acid prepolymer through the first reaction, add acetic anhydride, and obtain a fluorine-modified polyimide through the second reaction; Step S2: Dissolve the fluorine-modified polyimide and bisphenol A epoxy resin in a first solvent, add a catalyst, and react to obtain a fluorine-modified polyimide epoxy resin; Step S3: Dissolve isophorone diisocyanate, polypropylene glycol and amino-terminated polysiloxane in a second solvent, add a chain extender and a catalyst, and react to obtain a silicone-modified polyurethane; Step S4: Mix the fluorine-modified polyimide epoxy resin and the silicone-modified polyurethane, copolymerize to obtain an epoxy resin binder, add the inorganic abrasive mixture and the auxiliary materials, and stir to obtain a high-wear-resistant grinding wheel material; Step S5: Preheat the grinding wheel mold, pour in the high-wear-resistant grinding wheel material, cure at room temperature, and demold to obtain a high-wear-resistant grinding wheel.

4. The preparation method of a high wear-resistant grinding wheel by casting and curing according to claim 3, characterized in that, The first solvent is any one or more of N,N'-dimethylformamide and N-methyl-2-pyrrolidone; the second solvent is any one or more of dimethyl sulfoxide, tetrahydrofuran and acetone.

5. The preparation method of a highly wear-resistant grinding wheel formed by casting and curing according to claim 3, characterized in that, In step S1, the temperature of the first reaction is 0 - 5°C, and the reaction time is 10 - 15h; the temperature of the second reaction is 120 - 180°C, and the reaction time is 7 - 10h; the mass ratio of 4,4'-diaminodiphenyl ether, 4,4'-(hexafluoroisopropylidene) diphthalic anhydride, acetic anhydride and the first solvent is 1:(1.1 - 1.5):(0.1 - 0.4):(4 - 5).

6. The preparation method of a casting and curing high wear-resistant grinding wheel according to claim 3, characterized in that, In step S2, the catalyst is any one or more of triethylamine and 2-methylimidazole; the reaction temperature is 80 - 120°C, and the reaction time is 1 - 3h; the mass ratio of bisphenol A epoxy resin, fluorine-modified polyimide, catalyst and the first solvent is 1:(0.2 - 0.5):(0.01 - 0.05):(4 - 5).

7. The preparation method of a casting and curing high wear-resistant grinding wheel according to claim 3, characterized in that, In the step S3, the chain extender is any one or more of 1,4-butanediol and ethylene glycol; the catalyst is any one or more of stannous octoate and triethylenediamine.

8. The preparation method of a high wear-resistant grinding wheel by casting and curing according to claim 3, characterized in that, In the step S3, the mass ratio of the polypropylene glycol, isophorone diisocyanate, amino-terminated polysiloxane, chain extender, catalyst and the second solvent is 1:(1-1.2):(0.1-0.3):(0.01-0.03):(0.02-0.05):(4-5); the reaction temperature is 80-120 °C, and the reaction time is 8-12 h.

9. The preparation method of a high wear-resistant grinding wheel by casting and curing molding according to claim 3, characterized in that, In the step S4, the copolymerization temperature is 60-120 °C, and the copolymerization time is 1-5 h; the stirring temperature is 50-80 °C, and the stirring time is 1-3 h.

10. The preparation method of a high wear-resistant grinding wheel by casting and curing molding according to claim 3, characterized in that, In the step S5, the preheating temperature of the grinding wheel mold is 150-300 °C; the dosage of the high wear-resistant grinding wheel material is 60-100 g; the normal temperature curing time is 24-48 h.

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