AMOLED display glass edging grinding wheel binding agent, edging grinding wheel and preparation method of edging grinding wheel

Abstract

The invention belongs to the technical field of grinding wheels, and particularly relates to an AMOLED display glass edging grinding wheel binding agent, an edging grinding wheel and a preparation method of the edging grinding wheel. The grinding wheel binding agent comprises, by mass, 50-60 parts of a Cu-Sn alloy metal phase, 20-30 parts of a hydrogenated butadiene-acrylonitrile rubber nano rubber phase, 5-10 parts of nano aluminum oxide reinforcing filler, 3-5 parts of a molybdenum disulfide lubricant and 2-3 parts of a titanium hydride sintering aid. The invention further provides a formula and a preparation method of the grinding wheel. According to the method, the defects of an existing process are overcome, a nano rubber phase of hydrogenated nitrile rubber is combined with a Cu-Sn alloy metal phase, a flexible composite binding agent with flexible buffering and rigid supporting functions is formed, and the effects of buffering grinding vibration and reducing edge cracking are achieved.

Description

Technical Field

[0001] This invention belongs to the field of grinding wheel technology, specifically relating to an AMOLED display glass edging grinding wheel binder and edging grinding wheel and its preparation method. Background Technology

[0002] AMOLED, as a next-generation display technology, has been widely used in smartphones, wearable devices, and high-end televisions due to its advantages such as high contrast, wide color gamut, and flexibility. The core substrate material for AMOLED typically uses ultra-thin glass or polyimide film. Ultra-thin glass substrates, in particular, hold a crucial position in high-resolution flexible displays due to their excellent mechanical strength, thermal stability, and optical properties. However, during the processing of AMOLED glass, ultra-thin glass is fragile and prone to edge micro-cracks in traditional machining, affecting yield. Simultaneously, the edge roughness of ultra-thin glass needs to be controlled at the nanometer level (<0.5nm) to prevent surface light scattering and stress concentration. Currently, the grinding wheels used for AMOLED glass mainly rely on diamond or silicon carbide abrasives. In actual use, the abrasive distribution is not uniform, leading to localized stress concentration and increasing the risk of edge micro-cracks. Furthermore, the uniform abrasive particle size necessitates separate coarse and fine grinding processes, resulting in low efficiency. Additionally, the excessively rigid binder on the grinding wheel has caused vibration damage to the ultra-thin glass, further impacting yield. To address the aforementioned issues, AMOLED glass requires a flexible binder, which is then used as a raw material to prepare edge grinding wheels to buffer grinding vibrations and reduce edge chipping. Summary of the Invention

[0003] To address the problems in the existing technology, this invention provides an AMOLED display glass edge grinding wheel binder that overcomes the shortcomings of the existing process. It utilizes hydrogenated nitrile rubber nano-rubber combined with a Cu-Sn alloy metal phase to form a flexible composite binder that combines flexible buffering and rigid support, thereby buffering grinding vibrations and reducing edge chipping.

[0004] To achieve the above technical objectives, the technical solution of the present invention is as follows: An AMOLED display glass edge grinding wheel bonding agent, the mass ratio of which is: 50-60 parts of Cu-Sn alloy metallic phase, 20-30 parts of hydrogenated nitrile rubber nano rubber phase, 5-10 parts of nano alumina reinforcing filler, 3-5 parts of molybdenum disulfide lubricant, and 2-3 parts of hydrogenated titanium sintering aid.

[0005] The copper-tin ratio in the Cu-Sn alloy metal phase is 7:3. This metal phase can effectively provide rigid support and ensure the holding force of diamond abrasive. At the same time, a copper-tin ratio of 7:3 can effectively optimize the sintering fluidity of the metal phase.

[0006] The hydrogenated nitrile butadiene rubber nano-rubber phase has a particle size of 50-100 nm. This nano-rubber phase is a rubber material. Based on the good elasticity of the molecular chain, it effectively improves the buffering of vibration and reduces glass edge breakage. At this time, the nano-rubber phase is uniformly dispersed and can improve the interfacial bonding strength between the metal phase and the nano-rubber phase.

[0007] The nano-alumina reinforced filler can effectively improve the hardness of the binder. At the same time, by utilizing its own thermal conductivity and the homogeneous dispersion of nanomaterials, it can reduce the difference in thermal expansion coefficient between the rubber phase and the metal phase.

[0008] The molybdenum disulfide lubricant has a particle size ≤1μm, and this lubricant helps to reduce grinding temperature and prevent glass thermal cracking.

[0009] The sintering aid is titanium hydride, which can lower the sintering temperature and promote diffusion at the metal-rubber interface.

[0010] The hydrogenated nitrile butadiene rubber nano-rubber phase contains a coupling agent, which is KH550. The coupling agent is mixed before the hydrogenated nitrile butadiene rubber nano-rubber phase is used. The silane coupling agent can effectively improve the bonding activity of the hydrogenated nitrile butadiene rubber and increase the interfacial bonding strength.

[0011] A grinding wheel with the following mass percentages: 5-10% diamond, 50-60% Cu-Sn alloy metal phase, 20-30% hydrogenated nitrile rubber nano rubber phase, 5-10% nano alumina reinforcing filler, 3-5% molybdenum disulfide lubricant, and 2-3% hydrogenated titanium dioxide sintering aid.

[0012] The method for preparing the grinding wheel includes: Step 1: Nitrogen gas is introduced into the ball mill reactor to form a nitrogen atmosphere. Then, diamond, Cu-Sn alloy metal phase and nano alumina reinforcing filler are added and ball milled to obtain a mixed powder. The Cu-Sn alloy metal phase and nano alumina reinforcing filler form a homogeneous mixture and particle size refinement in the ball mill. Step 2: The emulsion of hydrogenated nitrile butadiene rubber nano-rubber phase is added to the mixed powder and ultrasonically dispersed, then dried to obtain a secondary mixed powder; the ultrasonic dispersion frequency is 40kHz and the time is 30min; adding the hydrogenated butyl rubber nano-rubber phase in the form of an emulsion can improve the dispersibility of the hydrogenated butyl rubber nano-rubber phase in the entire powder and ensure sufficient contact between the nano-rubber phase and the metal inorganic material; the mass concentration of the emulsion is 15%, and the solvent is water; Step 3: Add the lubricant and sintering aid to the secondary mixed powder and stir evenly to obtain wear-resistant powder. The stirring speed is 1000-2000 r / min and the temperature is room temperature. Step 4: Press the wear-resistant powder into shape using a mold to obtain a blank. The pressing pressure is 4-8 MPa, the time is 10-20 min, and the temperature is room temperature. Step 5 involves a secondary sintering process to obtain the finished product. This secondary sintering process is divided into low-temperature sintering and high-temperature sintering. The low-temperature sintering temperature is 200℃ for 1 hour, and the high-temperature sintering temperature is 380℃ for 2 hours. In this step, the low-temperature sintering cross-links and solidifies the rubber phase, forming an interface bond between the metal and the rubber. Meanwhile, the high-temperature sintering is a metal sintering process. At this temperature, titanium hydride decomposes, thereby activating the interface and effectively improving the stability of the grinding wheel itself.

[0013] As can be seen from the above description, the present invention has the following advantages: 1. This invention overcomes the shortcomings of existing processes by combining hydrogenated nitrile rubber with a Cu-Sn alloy metal phase to form a flexible composite binder that combines flexible buffering and rigid support, thereby buffering grinding vibrations and reducing edge chipping. 2. In this invention, a silane coupling agent is directly added to hydrogenated nitrile butadiene rubber. By utilizing the chemical group characteristics of the silane coupling agent, the interfacial bonding between the metal and the hydrogenated nitrile butadiene rubber is effectively improved. Detailed Implementation

[0014] The present invention will be described in detail with reference to the embodiments, but the claims of the present invention are not intended to limit the scope of the invention.

[0015] The mass ratio of the binder is as follows: 50-60 parts Cu-Sn alloy metal phase, 20-30 parts hydrogenated nitrile rubber nano rubber phase, 5-10 parts nano alumina reinforcing filler, 3-5 parts molybdenum disulfide lubricant, and 2-3 parts titanium disulfide sintering aid. The copper-tin ratio in the Cu-Sn alloy metal phase is 7:3, the particle size of the hydrogenated nitrile rubber nano rubber phase is 50-100 nm, and the particle size of the molybdenum disulfide lubricant is ≤1 μm. Example 1

[0016] A grinding wheel for edge grinding, composed of diamond and a flexible composite binder, with the following specific percentages: The composition consists of 6% diamond, 60% Cu-Sn alloy metal phase, 20% hydrogenated nitrile butadiene rubber nano rubber phase, 9% nano alumina reinforcing filler, 3% molybdenum disulfide lubricant, and 2% hydrogenated titanium dioxide sintering aid. Among these, the mass percentage of KH550 in the hydrogenated nitrile butadiene rubber nano rubber phase is 25%.

[0017] The method for preparing the grinding wheel includes: Step 1: Nitrogen gas is introduced into the ball mill reactor to form a nitrogen atmosphere. Then, diamond, Cu-Sn alloy metal phase and nano alumina reinforcing filler are added and ball milled to obtain a mixed powder. Step 2: The emulsion of hydrogenated nitrile butadiene rubber nano-rubber phase is added to the mixed powder and ultrasonically dispersed, and then dried to obtain a secondary mixed powder; the ultrasonic dispersion frequency is 40kHz and the time is 30min; the mass concentration of the emulsion is 15% and the solvent is water. Step 3: Add the lubricant and sintering aid to the secondary mixed powder and stir evenly to obtain wear-resistant powder. The stirring speed is 1000-2000 r / min and the temperature is room temperature. Step 4: Press the wear-resistant powder into shape using a mold to obtain a blank. The pressing pressure is 4-8 MPa, the time is 10-20 min, and the temperature is room temperature. Step 5: The preform is subjected to a second sintering process to obtain the finished product. The second sintering process is divided into low-temperature sintering and high-temperature sintering. The low-temperature sintering temperature is 200℃ and the time is 1 hour, while the high-temperature sintering temperature is 380℃ and the time is 2 hours.

[0018] The grinding wheel prepared by the above method is used for edge grinding. Under a grinding pressure of 0.5 N / mm², the edge roughness Ra of AMOLED glass is less than 0.3 nm, the chipping size is ≤15 μm, the feed speed is 8 m / min, and the single-groove grinding life is 650 m, which meets the high standards of the industry. Example 2

[0019] A grinding wheel for edge grinding, composed of diamond and a flexible composite binder, with the following specific percentages: Diamond 5%, Cu-Sn alloy metallic phase 50%, hydrogenated nitrile rubber nano rubber phase 30%, nano alumina reinforcing filler 10%, molybdenum disulfide lubricant 3%, and titanium hydrogenation sintering aid 2%.

[0020] The method for preparing the grinding wheel includes: Step 1: Nitrogen gas is introduced into the ball mill reactor to form a nitrogen atmosphere. Then, diamond, Cu-Sn alloy metal phase and nano alumina reinforcing filler are added and ball milled to obtain a mixed powder. Step 2: The emulsion of hydrogenated nitrile butadiene rubber nano-rubber phase is added to the mixed powder and ultrasonically dispersed, and then dried to obtain a secondary mixed powder; the ultrasonic dispersion frequency is 40kHz and the time is 30min; the mass concentration of the emulsion is 15% and the solvent is water. Step 3: Add the lubricant and sintering aid to the secondary mixed powder and stir evenly to obtain wear-resistant powder. The stirring speed is 1000-2000 r / min and the temperature is room temperature. Step 4: Press the wear-resistant powder into shape using a mold to obtain a blank. The pressing pressure is 4-8 MPa, the time is 10-20 min, and the temperature is room temperature. Step 5: The preform is subjected to a second sintering process to obtain the finished product. The second sintering process is divided into low-temperature sintering and high-temperature sintering. The low-temperature sintering temperature is 200℃ and the time is 1 hour, while the high-temperature sintering temperature is 380℃ and the time is 2 hours.

[0021] The grinding wheel prepared by the above method is used for edge grinding. Under a grinding pressure of 0.5 N / mm², the edge roughness Ra of AMOLED glass is <0.3 nm, the chipping size is ≤10 μm, the feed speed is 15 m / min, and the single-groove grinding life is 580 m, which meets the high standards of the industry. Example 3

[0022] A grinding wheel for edge grinding, composed of diamond and a flexible composite binder, with the following specific percentages: The composition consists of 10% diamond, 60% Cu-Sn alloy metallic phase, 20% hydrogenated nitrile butadiene rubber nano rubber phase, 5% nano alumina reinforcing filler, 3% molybdenum disulfide lubricant, and 2% hydrogenated titanium dioxide sintering aid. Among these, the mass percentage of KH550 in the hydrogenated nitrile butadiene rubber nano rubber phase is 25%.

[0023] The method for preparing the grinding wheel includes: Step 1: Nitrogen gas is introduced into the ball mill reactor to form a nitrogen atmosphere. Then, diamond, Cu-Sn alloy metal phase and nano alumina reinforcing filler are added and ball milled to obtain a mixed powder. Step 2: The emulsion of hydrogenated nitrile butadiene rubber nano-rubber phase is added to the mixed powder and ultrasonically dispersed, and then dried to obtain a secondary mixed powder; the ultrasonic dispersion frequency is 40kHz and the time is 30min; the mass concentration of the emulsion is 15% and the solvent is water. Step 3: Add the lubricant and sintering aid to the secondary mixed powder and stir evenly to obtain wear-resistant powder. The stirring speed is 1000-2000 r / min and the temperature is room temperature. Step 4: Press the wear-resistant powder into shape using a mold to obtain a blank. The pressing pressure is 4-8 MPa, the time is 10-20 min, and the temperature is room temperature. Step 5: The preform is subjected to a second sintering process to obtain the finished product. The second sintering process is divided into low-temperature sintering and high-temperature sintering. The low-temperature sintering temperature is 200℃ and the time is 1 hour, while the high-temperature sintering temperature is 380℃ and the time is 2 hours.

[0024] The grinding wheel prepared by the above method is used for edge grinding. Under a grinding pressure of 0.5 N / mm², the edge roughness Ra of AMOLED glass is less than 0.3 nm, the chipping size is less than 20 μm, the feed speed is 6 m / min, and the single-groove grinding life is 800 m, which meets the high standards of the industry.

[0025] The grinding wheels prepared in Examples 1-3 above can be widely used in the edge grinding process of AMOLED glass, and the roughness and chipping size meet the high standards of the industry, thus solving the defects of the prior art.

[0026] It is understood that the above detailed description of the present invention is for illustrative purposes only and is not intended to limit the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effects; as long as the usage requirements are met, they are all within the protection scope of the present invention.

Claims

1. A bonding agent for an AMOLED display glass edge grinding wheel, characterized in that: Its mass ratio is: 50-60 parts of Cu-Sn alloy metallic phase, 20-30 parts of hydrogenated nitrile rubber nano rubber phase, 5-10 parts of nano alumina reinforcing filler, 3-5 parts of molybdenum disulfide lubricant, and 2-3 parts of hydrogenated titanium sintering aid.

2. The AMOLED display glass edge grinding wheel bonding agent according to claim 1, characterized in that: The copper-tin ratio in the Cu-Sn alloy metallic phase is 7:

3.

3. The AMOLED display glass edge grinding wheel bonding agent according to claim 1, characterized in that: The particle size of the hydrogenated nitrile butadiene rubber nanophase is 50-100 nm.

4. The AMOLED display glass edge grinding wheel bonding agent according to claim 1, characterized in that: The particle size of the molybdenum disulfide lubricant is ≤1μm.

5. The AMOLED display glass edge grinding wheel bonding agent according to claim 1, characterized in that: The hydrogenated nitrile rubber nano-rubber phase contains a coupling agent.

6. The AMOLED display glass edge grinding wheel bonding agent according to claim 5, characterized in that: The coupling agent used is KH550.

7. A grinding wheel for edge polishing, characterized in that: The grinding wheel has the following mass percentages: diamond 5-10%, Cu-Sn alloy metal phase 50-60%, hydrogenated nitrile rubber nano rubber phase 20-30%, nano alumina reinforcing filler 5-10%, molybdenum disulfide lubricant 3-5%, and hydrogenated titanium sintering aid 2-3%.

8. The grinding wheel according to claim 7, characterized in that: The method for preparing the grinding wheel includes: Step 1: Nitrogen gas is introduced into the ball mill reactor to form a nitrogen atmosphere. Then, diamond, Cu-Sn alloy metal phase and nano alumina reinforcing filler are added and ball milled to obtain a mixed powder. Step 2: The emulsion of hydrogenated nitrile butadiene rubber nano-rubber phase is added to the mixed powder and ultrasonically dispersed, and then dried to obtain a secondary mixed powder; the ultrasonic dispersion frequency is 40kHz and the time is 30min. Step 3: Add the lubricant and sintering aid to the secondary mixed powder and stir evenly to obtain wear-resistant powder. The stirring speed is 1000-2000 r / min and the temperature is room temperature. Step 4: Press the wear-resistant powder into shape using a mold to obtain a blank. The pressing pressure is 4-8 MPa, the time is 10-20 min, and the temperature is room temperature. Step 5: The preform is subjected to a second sintering process to obtain the finished product. The second sintering process is divided into low-temperature sintering and high-temperature sintering. The low-temperature sintering temperature is 200℃ and the time is 1 hour, while the high-temperature sintering temperature is 380℃ and the time is 2 hours.