Diamond surface treatment process with high holding strength

Abstract

The invention relates to a composition for diamond surface treatment, which is prepared from the following raw materials in parts by volume: 12 to 35 parts of nickel-plated diamond, 40 to 50 parts of dispersing agent, 22 to 35 parts of composite resin liquid and 1 to 3 parts of photoinitiator. The invention also provides a process for treating the surface of the diamond with high holding strength by using the composition. The process comprises the following steps: uniformly mixing the nickel-plated diamond and the dispersing agent, adding the composite resin liquid and the photoinitiator, uniformly mixing, and drying; then carrying out pre-photocuring treatment, and then dispersing; and finally, uniformly mixing with a filler through a three-dimensional mixer, carrying out complete light curing treatment, and sieving to obtain the nickel-plated diamond with an adhesion layer on the surface. The diamond surface treatment process has the advantages of being high in bonding capacity, high in holding strength, good in dispersity, capable of achieving single-time large-batch production, high in universality and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of diamond surface treatment, and in particular relates to a diamond surface treatment process with high holding strength. Background Art

[0002] Diamond has the advantages of high hardness, high wear resistance, high thermal conductivity, and corrosion resistance. It is widely used in the cutting and grinding of silicon, silicon carbide, cemented carbide, and composite materials. Resin-bonded diamond grinding wheels have good self-sharpening properties and excellent surface quality, but the resin itself has low strength and its ability to hold diamonds is weaker than that of metal bonds, resulting in a generally lower lifespan of resin diamond grinding wheels. To address this issue, the industry often uses diamond surface plating to increase the holding power of resin bonds on diamonds, such as nickel plating to increase weight by 30%, 56%, etc. Although this method can increase the lifespan of diamond grinding wheels, the enhancement effect has reached its upper limit. In addition, excessively thick coatings will hinder diamond sharpening, resulting in reduced grinding wheel sharpness and reduced processing efficiency.

[0003] The Chinese patent with application number CN202310618643.1 adds diamond, metal powder etchant, additives, and dispersant into a three-dimensional mixer and mixes them evenly, then puts the evenly mixed mixture into a muffle furnace for etching heat treatment, and finally takes out the diamond after the treatment is completed, and uses a sieve to sieve the diamond and metal mixed powder, additives, and dispersant to obtain a rough surface diamond. Although this method can be mass-produced, the etching temperature reaches above 820°C, the energy consumption is high, and it is difficult to control the etching process and uniformity in the high-temperature furnace chamber. The Chinese patent with authorization announcement number CN117862967B cleans the plated diamond, then lays it flat on the inside of the hoisting rail, pours the grinding liquid into the grinding mechanism, and starts the grinding mechanism to grind the surface of the diamond for 5-15 minutes. The patent uses a grinding method to treat diamonds, which will directly cause damage to the surface coating, and the grinding resistance will affect the bonding strength between the coating and the diamond.

[0004] Based on this, this application was developed. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art, break through the bottleneck of the existing diamond surface treatment technology, and provide a diamond surface treatment process with strong bonding ability, high holding strength, good dispersibility, and the ability to be produced in large quantities at a single time and with strong versatility.

[0006] To achieve the above object, the present invention adopts the following technical solution: A composition for diamond surface treatment comprises raw materials in the following proportions: 12-35 parts of nickel-plated diamond, 40-50 parts of dispersant, 22-35 parts of composite resin liquid, and 1-3 parts of photoinitiator 1173, calculated by volume.

[0007] Specifically, the dispersant includes but is not limited to one or more of ethanol, water, glacial acetic acid and KH550; the composite resin liquid includes but is not limited to one or more of phenolic resin, styrene, tripropylene glycol diacrylate and the like.

[0008] Furthermore, the dispersant is preferably composed of 45-70 parts of ethanol, 5-10 parts of water, 5-15 parts of glacial acetic acid, and 3-12 parts of KH550, calculated by volume.

[0009] Furthermore, the ratio of the composite resin liquid is preferably: 25-40 parts of phenolic resin, 5-15 parts of styrene, and 35-70 parts of tripropylene glycol diacrylate, calculated by volume.

[0010] Further, the nickel layer of the nickel-plated diamond can be increased by 30%-56%, and the particle size is M35 / 54 or finer, specifically M36 / 54, M22 / 36, M20 / 30, M12 / 22, M10 / 20, M8 / 16, M8 / 12, M6 / 12, M5 / 10, M4 / 8, M3 / 6, etc. The nickel-plated diamond is a common commercial product.

[0011] The invention provides application of the composition in surface treatment of diamond with high holding strength.

[0012] The present invention provides a process for treating the surface of diamond with high holding strength by using the above composition, which comprises the following steps: S1, mixing nickel-plated diamond and dispersant evenly, adding composite resin liquid and photoinitiator, mixing evenly and drying; S2, pre-photocuring the product obtained in step S1, and then dispersing it; S3, the dispersed product of step S2 is mixed evenly with the filler by a three-dimensional mixer and completely photocured, and nickel-plated diamond with an adhesion layer on the surface is obtained after sieving.

[0013] Specifically, in step S1, the abrasive nickel-plated diamond can be placed in a dispersant, stirred at 60-90°C for 15-40 minutes, and the composite resin liquid and the photoinitiator are added, mixed evenly, and then dried; in step S2, an ultrasonic resonator can be used for dispersion, and the acceleration of the ultrasonic resonator can be 39.2-68.6 m / s 2 , the frequency can be 50-80Hz, and the dispersion time can be 100-140s.

[0014] Specifically, in step S2, the product can be placed in a light curing machine for a pre-light curing treatment of 5 to 10 seconds; in step S3, the light curing time of the full light curing treatment can be 10 to 45 seconds.

[0015] Furthermore, in step S3, the filler can be ZrW2O8 powder with a particle size of 0.4-3.6 μm; by volume, the amount of the product after dispersion in step S2 added is 85-92 parts, and the amount of ZrW2O8 powder added can be 8-15 parts.

[0016] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: The present invention photocures a layer of resin liquid on the surface of the diamond nickel layer, which greatly improves the cross-linking ability of the resin liquid and the grinding wheel resin binder; the introduction of the ZrW2O8 filler enhances the strength of the resin liquid on the surface of the nickel layer, adjusts the expansion coefficient of the resin liquid and the resin binder, and significantly reduces the interface bonding defects; the synergistic effect of the pre-photocuring process and the filler solves the problem that the resin liquid on the surface of the nickel-plated diamond is easy to agglomerate after complete photocuring, and the obtained diamond particles have good dispersibility; at the same time, the process is simple and can be produced in large quantities at a single time, and has great application value in the grinding processing of materials such as glass, ceramics, cemented carbide, silicon and silicon carbide. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of a diamond surface treatment process with high holding strength in a preferred embodiment of the present invention; Figure 2 SEM images of the diamond surfaces obtained in Example 1 of the present invention and Comparative Example 1; Figure 3 The SEM images of the fracture surfaces of the superhard grinding wheels obtained in Example 1, Example 2, Example 3 and Comparative Example 1 of the present invention are shown.

[0018] Figure 4 This is a statistical graph of the nickel-plated diamond self-stripping rate of the superhard grinding wheel fracture SEM images obtained in Example 1, Example 2, Example 3 and Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The protection scope of the present invention is not limited to this.

[0020] Reference Figure 1 As shown, a preferred embodiment of the present invention, a diamond surface treatment process with high holding strength, comprises the following steps: S1, mixing nickel-plated diamond and dispersant evenly, adding composite resin liquid and photoinitiator, mixing evenly and drying; Among them, by volume, the added amount of dispersant is 40-50 parts, the added amount of composite resin liquid is 22-35 parts, the added amount of photoinitiator is 1-3 parts, and the added amount of diamond is 12-35 parts; uniform mixing is to put nickel-plated diamond abrasive into the dispersant, stir for 30 minutes at 60-90°C, add composite resin liquid and photoinitiator 1173, mix evenly and then dry.

[0021] The dispersant is composed of one or more of ethanol, water, glacial acetic acid and KH550; the proportions of ethanol, water, glacial acetic acid and KH550 in the dispersant of this embodiment are: by volume, 45-70 parts of ethanol, 5-10 parts of water, 5-15 parts of glacial acetic acid, and 3-12 parts of KH550.

[0022] The composite resin liquid is composed of one or more of phenolic resin, styrene, and tripropylene glycol diacrylate; the ratio of phenolic resin, styrene, and tripropylene glycol diacrylate in the composite resin liquid of this embodiment is: by volume, 25-40 parts of phenolic resin, 5-15 parts of styrene, and 35-70 parts of tripropylene glycol diacrylate.

[0023] The nickel layer of the nickel-plated diamond abrasive is increased by 30% and 56%, and the particle size is M35 / 54 or finer.

[0024] S2, pre-light-curing the diamond obtained in step S1, and then dispersing it using an ultrasonic resonator; The pre-light curing treatment is to place the diamond obtained in step S1 in a light curing machine for 5 to 10 seconds of pre-light curing, and the acceleration of the ultrasonic resonance instrument is 58.8 m / s 2 , frequency is 50-80Hz, and dispersion time is 100-140s.

[0025] S3, the diamonds dispersed in step S2 are mixed evenly with fillers by a three-dimensional mixer and completely photocured, and nickel-plated diamonds with an adhesion layer on the surface are obtained after sieving.

[0026] The light curing time of the complete light curing treatment is 10-45 seconds. The filler is ZrW2O8 powder with a particle size of 0.4-3.6 μm. The amount of ZrW2O8 powder added is 8-15 parts by volume.

[0027] Example 1 A surface treatment process of nickel-plated diamond (common commercial product) with a particle size of M22 / 36 and a weight gain of 30%, comprising the following steps: S101. Preparation of dispersant By volume, weigh 69 parts of ethanol, 8 parts of water, 13 parts of glacial acetic acid, and 10 parts of KH550, mix the medicines and stir evenly.

[0028] S102. Preparation of composite resin liquid Weigh 35 parts of phenolic resin, 12 parts of styrene, and 53 parts of tripropylene glycol diacrylate by volume, and mix the medicines evenly.

[0029] S103, nickel-plated diamond, dispersant, composite resin liquid, photoinitiator mixture By volume, 30 parts of nickel-plated diamond abrasive were added to 45 parts of dispersant, stirred at 60° C. for 30 minutes, and 24 parts of composite resin liquid and 1 part of photoinitiator were added, mixed evenly and dried.

[0030] S104, pre-light curing and ultrasonic dispersion The diamond dried in step S103 is placed in a light curing machine for 8 seconds of pre-light curing, and then dispersed using an ultrasonic resonator with an acceleration of 58.8 m / s 2 , frequency is 80Hz, and dispersion time is 140s.

[0031] S105, mixed with filler and completely light-cured By volume, 85 parts of pre-light-cured and dispersed diamond and 15 parts of ZrW2O8 powder were weighed, mixed evenly in a three-dimensional mixer, and placed in a light-curing machine for 35 seconds of complete light-curing treatment. After passing through a 400# sieve, nickel-plated diamond with an adhesion layer on the surface was obtained.

[0032] Example 2 The surface treatment process of nickel-plated diamond (common commercial product) with a particle size of M22 / 36 and a weight gain of 56% includes the following steps: S101. Preparation of dispersant By volume, weigh 69 parts of ethanol, 8 parts of water, 13 parts of glacial acetic acid, and 10 parts of KH550, mix the medicines and stir evenly.

[0033] S102. Preparation of composite resin liquid Weigh 25 parts of phenolic resin, 14 parts of styrene, and 61 parts of tripropylene glycol diacrylate by volume, and mix the medicines evenly.

[0034] S103, nickel-plated diamond, dispersant, composite resin liquid, photoinitiator mixture By volume, 30 parts of nickel-plated diamond abrasive were added to 45 parts of dispersant, stirred at 60° C. for 30 minutes, and 24 parts of composite resin liquid and 1 part of photoinitiator were added, mixed evenly and dried.

[0035] S104, pre-light curing and ultrasonic dispersion The diamond dried in step S103 is placed in a light curing machine for 5 seconds of pre-light curing, and then dispersed using an ultrasonic resonator with an acceleration of 58.8 m / s 2 , frequency is 80Hz, and dispersion time is 140s.

[0036] S105, mixed with filler and completely light-cured 92 parts of pre-light-cured and dispersed diamond and 8 parts of ZrW2O8 powder were weighed by volume, mixed evenly in a three-dimensional mixer, and placed in a light-curing machine for 30 seconds of complete light-curing treatment. After passing through a 400# sieve, nickel-plated diamond with an adhesion layer on the surface was obtained.

[0037] Example 3 The surface treatment process of nickel-plated diamond (common commercial product) with a particle size of M8 / 12 and a weight gain of 30% includes the following steps: S101. Preparation of dispersant By volume, weigh 69 parts of ethanol, 8 parts of water, 13 parts of glacial acetic acid, and 10 parts of KH550, mix the medicines and stir.

[0038] S102. Preparation of composite resin liquid Weigh 35 parts of phenolic resin, 12 parts of styrene, and 53 parts of tripropylene glycol diacrylate by volume, and mix the medicines evenly.

[0039] S103, nickel-plated diamond, dispersant, composite resin liquid, photoinitiator mixture By volume, 30 parts of nickel-plated diamond abrasive were added to 45 parts of dispersant, stirred at 60° C. for 30 minutes, and 24 parts of composite resin liquid and 1 part of photoinitiator were added, mixed evenly and dried.

[0040] S104, pre-light curing and ultrasonic dispersion The diamond dried in step S103 is placed in a light curing machine for 8 seconds of pre-light curing, and then dispersed using an ultrasonic resonator with an acceleration of 58.8 m / s 2 , frequency is 80Hz, and dispersion time is 140s.

[0041] S105, mixed with filler and completely light-cured 85 parts of pre-light-cured diamond and 15 parts of ZrW2O8 powder were weighed by volume, mixed evenly by a three-dimensional mixer, and placed in a light-curing machine for 35 seconds of full light-curing treatment. After passing through a 500# sieve, nickel-plated diamond with an adhesion layer on the surface was obtained.

[0042] Comparative Example 1 Nickel-plated diamond with a particle size of M22 / 36 and a weight gain of 30% without surface treatment (common commercial product).

[0043] The diamonds obtained in Example 1 and Comparative Example 1 were observed by scanning electron microscopy. Figure 2 As shown, the surface of the diamond without surface treatment in Comparative Example 1 is composed of a Ni layer, while the surface adhesion layer obtained by the present method is composed of resin and ZrW2O8 powder, which is densely bonded to the Ni layer on the diamond surface.

[0044] The diamond obtained in Example 1, Example 2, Example 3 and Comparative Example 1 was mixed evenly with phenolic resin and silicon carbide, and then formed by a hot press, and then cured to obtain a superhard grinding wheel. Figure 3 and Figure 4 The SEM analysis of the superhard grinding wheel fracture shows that: using the process of the present invention, the self-stripping rate of the Ni layer on the surface of the nickel-plated diamond with a weight gain of 30% of the particle size M22 / 36, the nickel-plated diamond with a weight gain of 56% of the particle size M22 / 36, and the nickel-plated diamond with a weight gain of 30% of the particle size M8 / 12 is higher than that in Comparative Example 1, indicating that the phenolic resin binder has a higher holding strength on the Ni layer, and the blade effect is good at the same time, and the obtained superhard grinding wheel has good sharpness and a long life. It can be seen from Table 1 that the tensile strength and hardness of the grinding wheel can be significantly improved by using the process of the present invention.

[0045] Table 1 Tensile strength and Rockwell hardness test of superhard grinding wheels obtained in Examples 1-3 of the present invention and Comparative Example 1 Under the premise that no conflict occurs, those skilled in the art may freely combine and superimpose the above-mentioned additional technical features.

[0046] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A composition for diamond surface treatment, characterized in that The invention comprises raw materials in the following proportions: by volume, 12-35 parts of nickel-plated diamond, 40-50 parts of dispersant, 22-35 parts of composite resin liquid and 1-3 parts of photoinitiator.

2. The diamond surface treatment composition according to claim 1, wherein The dispersant is composed of one or more of ethanol, water, glacial acetic acid and KH550; the composite resin liquid is composed of one or more of phenolic resin, styrene and tripropylene glycol diacrylate.

3. The diamond surface treatment composition according to claim 2, wherein: Calculated by volume, the proportion of the dispersant is: 45-70 parts of ethanol, 5-10 parts of water, 5-15 parts of glacial acetic acid, and 3-12 parts of KH550.

4. The diamond surface treatment composition according to claim 2, wherein: The proportion of the composite resin liquid is: 25-40 parts of phenolic resin, 5-15 parts of styrene, and 35-70 parts of tripropylene glycol diacrylate by volume.

5. The diamond surface treatment composition according to claim 1, wherein The nickel-plated diamond has a nickel layer weight increase of 30%-56% and a particle size of M35 / 54 or finer.

6. Use of the composition according to any one of claims 1 to 5 in high holding strength diamond surface treatment.

7. A process for treating a diamond surface with high holding strength using the composition according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, mixing nickel-plated diamond and dispersant evenly, adding composite resin liquid and photoinitiator, mixing evenly and drying; S2, pre-photocuring the product obtained in step S1, and then dispersing it; S3, the dispersed product of step S2 is mixed evenly with the filler by a three-dimensional mixer and completely photocured, and nickel-plated diamond with an adhesion layer on the surface is obtained after sieving.

8. The process according to claim 7, characterized in that In step S1, nickel-plated diamond is placed in a dispersant, stirred at 60-90°C for 15-40 minutes, a composite resin liquid and a photoinitiator are added, mixed evenly, and then dried; in step S2, an ultrasonic resonator is used for dispersion, and the acceleration of the ultrasonic resonator is 39.2-68.6 m / s 2 , frequency is 50-80Hz, and dispersion time is 100-140s.

9. The process according to claim 7, characterized in that In step S2, the product is placed in a light curing machine for a pre-light curing treatment of 5 to 10 seconds; in step S3, the light curing time of the full light curing treatment is 10 to 45 seconds.

10. The process according to claim 7, characterized in that In step S3, the filler is ZrW2O8 powder with a particle size of 0.4-3.6 μm; by volume, the amount of the dispersed product added in step S2 is 85-92 parts, and the amount of ZrW2O8 powder added is 8-15 parts.

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