Soft-matrix elastic composite polishing abrasive and preparation method thereof

Abstract

The invention discloses a soft matrix elastic composite polishing abrasive and a preparation method thereof, the soft matrix elastic composite polishing abrasive comprises a base material, grinding sand grains and a reinforcing filler, the base material specifically is thermoplastic polyester elastomer TPU (50A degree) particles, and the reinforcing filler specifically is carbon fiber. The soft-base elastic composite polishing abrasive material is a pellet-shaped soft-base elastic composite abrasive material, and due to the softness of the soft-base elastic composite abrasive material, when the composite abrasive material is used for flexibly polishing a complex surface during metal surface machining, the composite abrasive material is not broken and rubs along with the surface, a curved surface cutting and grinding interface on a workpiece is more uniform, and the effect is more obvious especially when the composite abrasive material is used for precision polishing; the soft-matrix composite elastic polishing abrasive material has the advantages that the abrasive material is more durable in abrasive resistance and grinding performance and more flexible, the soft-matrix composite elastic polishing abrasive material is used on a jet type automatic polishing machine, can replace manual flexible polishing machining and is also suitable for being applied to an assembly line of automatic production, the machining precision and the production efficiency of the soft-matrix composite elastic polishing abrasive material are improved, and pollution to the environment is completely eradicated.

Description

Technical Field

[0001] The invention relates to the technical field of polishing processing, in particular to a soft-matrix elastic composite polishing abrasive and a preparation method thereof. Background Art

[0002] Soft matrix elastic composite polishing abrasive is a pellet-shaped abrasive used for polishing complex surfaces of steel, aluminum, composite materials, etc., especially various molding molds.

[0003] The Chinese invention patent with the authorization announcement number CN115820209A discloses a method for preparing soft elastic abrasive grains for tool polishing and passivation, which includes polymer viscoelastic substrate processing, multi-component abrasive preparation, soft carrier particle heating, soft carrier / hard abrasive composite particle preparation and soft carrier / hard abrasive composite particle post-processing, etc. The soft elastic abrasive grains are a "core-shell" structure in which hard abrasives are evenly embedded on the surface of the soft carrier. When the abrasive grains are used for tool surface polishing and passivation processing, the abrasive grains collide with the tool surface and its soft carrier will be deformed, which will cause the abrasive grains to produce certain scratching, rolling and plowing effects on the tool surface, and the surface material is finely removed, and finally high-efficiency and high-precision polishing and passivation integrated processing is achieved.

[0004] The existing polishing abrasives commonly used are natural materials of different coarse and fine meshes, and the sand used by sandblasting, such as white corundum, silicon carbide, aluminum hydroxide, resin blocks, walnut powder, etc., are all monomer polishing abrasives, which can be coated on sand belts, polishing wheels, and polishing discs as abrasives to polish metal surfaces. Due to the different polishing methods, there are great limitations on the polishing of large-area molds, and it is inconvenient to perform mechanized automatic polishing; because there are many types of molds, and the surfaces are complex and irregular, manual polishing has always been required, which is laborious, time-consuming, costly, and inefficient. Summary of the invention

[0005] The purpose of the present invention is to provide a soft matrix elastic composite polishing abrasive and a preparation method thereof, which solves the problem that due to different polishing methods, the polishing of large-area molds has great limitations and is inconvenient to perform mechanized automatic polishing; there are many types of molds, and the surfaces are complex and irregular, and manual polishing has always been required, which is laborious, time-consuming, costly and inefficient.

[0006] The present invention solves the above technical problems through the following technical scheme, which includes: base material, grinding sand and reinforcing filler, wherein the base material is specifically thermoplastic polyester elastomer TPU (50A degree) particles, and the reinforcing filler is specifically carbon fiber.

[0007] Preferably, the grinding sand particles are specifically cutting abrasives, the cutting abrasives are specifically corundum, aluminum oxide and silicon carbide, and the particle size of the cutting abrasives is specifically 100-3000 meshes.

[0008] Preferably, the weight of the thermoplastic polyester elastomer TPU (50A degree) particles accounts for 50% to 65%, the weight of the cutting abrasive accounts for 30% to 45%, and the weight of the carbon fiber accounts for 5%.

[0009] Preferably, the grinding sand particles are polishing abrasives, and the polishing abrasives are specifically pig bristles, wool and palm fibers, and the length of the short fibers of the polishing abrasives is 1-3 mm.

[0010] Preferably, the weight of the thermoplastic polyester elastomer TPU (50A degree) particles accounts for 60% to 75%, the weight of the polishing abrasive accounts for 25% to 35%, and the weight of the carbon fiber accounts for 5%.

[0011] The preparation method of the soft matrix elastic composite polishing abrasive comprises the following steps:

[0012] Step S1, raw material preparation: select the appropriate abrasive mesh size according to the workpiece processing requirements;

[0013] Step S2, preparing a coupling agent solution: according to the mass of the functional hard abrasive, 1% silane coupling agent and 4% anhydrous ethanol are mixed to form a coupling agent solution;

[0014] Step S3, abrasive pretreatment: pretreating the functional hard abrasive and the carbon fiber filler by soaking them in a silane coupling agent solution, and then air-drying the abrasive to form a coupling layer for standby use;

[0015] Step S4, material ratio: mixing thermoplastic polyester elastomer TPU (50A degree) particles, functional hard abrasive, and carbon fiber (diameter 30-50um) evenly in a dry state; the weight percentage of each component of the mixture is: thermoplastic polyester elastomer TPU particles 50%-65%, abrasive 30%-45%, carbon fiber 5%;

[0016] Step S5, granulation: pour the mixed material with a good ratio into the mixer of the granulator for melting and blending, the granulator is adjusted to a temperature of 180-200 degrees, the mixture is heated, stirred and extruded in the mixing and melting zone of the granulator, the TPU particles are plasticized into a viscous fluid, the functional abrasive and the carbon fiber filler are evenly integrated therein, and a polymer eutectic colloidal mixture is prepared, and then the mixture is cooled underwater through the extrusion hole of the granulator and cut into cylindrical particles with a diameter of 2-4 mm and a length of 2-4 mm, and the prepared composite elastic particles are drained and dried;

[0017] Step S6, spheronization: pour the cylindrical particles formed and dried by the granulator into a spheronization barrel on a heated spheronization machine, the speed of the spheronization machine is modulated at 20-60 rpm, the heating temperature is between 150-180 degrees, and hard abrasive sand with the same mesh size as that mixed with the particles is added, and spheronization is performed for 5-8 minutes to form an outer layer, and spheronized spherical particles with a diameter of about (3-8mm) are spheronized to produce soft matrix composite elastic polishing abrasive;

[0018] Step S7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0019] Preferably, the method for preparing the soft matrix elastic composite polishing abrasive comprises the following steps:

[0020] Step V1, raw material preparation: select the 1-3mm short fiber hardness of the appropriate abrasive according to the workpiece processing requirements;

[0021] Step V2, preparing a coupling agent solution: according to the functional soft hair and fiber mass, 1% silane coupling agent and 4% anhydrous ethanol are mixed to form a coupling agent solution;

[0022] Step V3, abrasive pretreatment: pretreating the functional soft abrasive and the carbon fiber filler by soaking them in a silane coupling agent solution, and forming a coupling layer on the surface of the abrasive after air drying for standby use;

[0023] Step V4, material ratio: mix thermoplastic polyester elastomer TPU (50A degree) particles, pre-treated functional soft abrasive, and carbon fiber (diameter 30-50um) evenly in a dry state, and the weight percentage of each component of the mixture is: thermoplastic polyester elastomer TPU particles 60%-75%, abrasive 25%-35%, carbon fiber 5%;

[0024] Step V5, granulation: pour the mixed material with good proportion into the mixer of the granulator for melting and blending, the temperature of the granulator is adjusted to 180-200 degrees, the mixture is heated in the mixing and melting zone of the granulator, the TPU particles are plasticized into a viscous fluid, the functional soft abrasive and the carbon fiber filler are evenly integrated therein, and a polymer eutectic colloidal mixture is prepared, and then the mixture is cooled underwater through the extrusion hole of the granulator and cut into cylindrical particles with a diameter of 2-4 mm and a length of 2-4 mm;

[0025] Step V6, spheronization: pour the cylindrical particles formed by the granulator into a spheronization barrel on a heated spheronization machine for spheronization. The speed of the spheronization machine is modulated at 20-60 rpm, and the heating temperature is between 150-180 degrees. Put in the soft abrasive short fibers with the same mesh size as the fused particles, and spheronize for 6-10 minutes to form an outer layer. The short fibers are completely melted into one, and spherical particles with a diameter of about (3-8mm) are spheronized to produce soft matrix composite elastic polishing abrasives. After spheronization, pour out and sort by size particles;

[0026] Step V7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The soft-base elastic composite polishing abrasive of the present invention is a pellet-shaped soft-base elastic composite abrasive. Its softness makes the composite abrasive not break or rub along the surface during flexible polishing of complex surfaces during metal surface processing, and makes the curved surface cutting and grinding interface on the workpiece more uniform, especially the effect is more obvious during precision polishing. The wear resistance and grinding performance of the abrasive are more durable and more flexible.

[0029] 2. The soft matrix composite elastic polishing abrasive of the present invention can be used in a jet-type automatic polishing machine to replace manual flexible polishing processing, and is also suitable for use in automated production lines. Its processing accuracy and production efficiency are improved, and environmental pollution is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the polishing effect diagram of 400 mesh aluminum alloy;

[0031] Figure 2 This is the polishing effect diagram of 100 mesh aluminum alloy;

[0032] Figure 3 This is a view of a soft-based projectile. DETAILED DESCRIPTION

[0033] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0034] Soft matrix elastic composite polishing abrasive is a material with a thermoplastic elastomer as the matrix, mixed with hard or soft granular polishing abrasive in a heated state, as a functional filler for the elastomer matrix; through technical treatment, abrasive particles of different sizes are evenly dispersed and sealed in the abrasive rubber particles in the thermoplastic elastomer. The grinding sand grains can be hard grinding materials made of corundum and aluminum hydroxide of different coarseness and fineness, or soft abrasives such as bristle, wool and palm fiber.

[0035] Embodiment 1

[0036] This embodiment provides a technical solution: a soft matrix elastic composite polishing abrasive, including: 50A degree thermoplastic polyester elastomer TPU particles, 100 mesh corundum and 50um carbon fiber, wherein the thermoplastic polyester elastomer TPU particles are 600g, the corundum is 350g, and the carbon fiber is 50g.

[0037] Prepare by the following preparation steps:

[0038] Step S1, raw material preparation: select 100 mesh corundum according to the rough polishing processing requirements of the workpiece;

[0039] Step S2, preparing a coupling agent solution: mixing 1 kg of corundum, adding 10 g of silane coupling agent and 40 g of anhydrous ethanol, and stirring the mixture in a stirrer to obtain 10 L of a coupling agent solution;

[0040] Step S3, abrasive pretreatment: soak 1 kg of corundum in the prepared coupling agent solution, keep soaking at room temperature for 2 hours, and then air-dry for 2 hours to form a coupling layer for standby use;

[0041] Step S4, material ratio: 600g of thermoplastic polyester elastomer TPU particles, 350g of corundum, and 50g of carbon fiber are mixed evenly in a dry state, and the weight percentage of each component of the mixture is: 65% of thermoplastic polyester elastomer TPU particles, 35% of corundum, and 5% of carbon fiber;

[0042] Step S5, granulation: pour the mixed material with a good ratio into the mixer of the granulator for melt blending, the granulator is adjusted to a temperature of 190° C., and the mixture is melt blended for 15 minutes until the mixture reaches a uniform viscous state, and then the mixture is cooled underwater through the extrusion hole of the granulator and cut into cylindrical particles with a diameter of 2-4 mm and a length of 2-4 mm. The composite elastic particles are drained and dried;

[0043] Step S6, spheronization: pour the dried cylindrical particles into a spheronization barrel on a heated spheronization machine, set the rotation speed at 40 rpm, the heating temperature at 160°C, add 120 mesh corundum, and spheronize for 8 minutes to form an outer layer, spheronizing spherical particles with a diameter of 3-8 mm and a mass of about 900 g;

[0044] Step S7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0045] Embodiment 2

[0046] This embodiment provides a technical solution: a soft matrix elastic composite polishing abrasive, including: 50A degree thermoplastic polyester elastomer TPU particles, 400 mesh aluminum oxide and 50um carbon fiber, wherein the thermoplastic polyester elastomer TPU particles are 550g, the aluminum oxide is 400g, and the carbon fiber is 50g.

[0047] Prepare by the following preparation steps:

[0048] Step S1, raw material preparation: select 400 mesh aluminum oxide according to the medium polishing processing requirements of the workpiece;

[0049] Step S2, preparing a coupling agent solution: mixing 1 kg of aluminum oxide, adding 10 g of a silane coupling agent and 40 g of anhydrous ethanol, and blending into a coupling agent solution;

[0050] Step S3, abrasive pretreatment: soak 1 kg of aluminum oxide in a coupling agent solution, keep it soaked at room temperature for 3 hours, and air-dry it for 4 hours to form a coupling layer for standby use;

[0051] Step S4, material ratio: 550g of thermoplastic polyester elastomer TPU particles, 400g of aluminum oxide, and 50g of carbon fiber are mixed evenly in a dry state, and the weight percentage of each component of the mixture is: 55% of thermoplastic polyester elastomer TPU particles, 40% of aluminum oxide, and 5% of carbon fiber;

[0052] Step S5, granulation: pour the mixed material with good proportion into the mixer of the granulator for melt blending, the granulator is adjusted to a temperature of 190° C., melt blending for 20 minutes, to prepare a high polymer eutectic colloidal mixture, and then pass through the extrusion hole of the granulator to cool underwater and cut into cylindrical particles with a diameter of 2-4 mm and a length of 2-4 mm, drain the prepared composite elastic particles, and dry them;

[0053] Step S6, spheronization: pour the dried cylindrical particles into a spheronization barrel on a heated spheronization machine, set the rotation speed at 30 rpm, the heating temperature at 170°C, put in 400 mesh aluminum oxide, and spheronize for 6 minutes to form an outer layer, spheronizing spherical particles with a diameter of 4-8 mm and a mass of about 850 g;

[0054] Step S7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0055] Embodiment 3

[0056] This embodiment provides a technical solution: a soft matrix elastic composite polishing abrasive, including: 50A degree thermoplastic polyester elastomer TPU particles, 1200 mesh silicon carbide and 50um carbon fiber, wherein the thermoplastic polyester elastomer TPU particles are 500g, the silicon carbide is 450g, and the carbon fiber is 50g.

[0057] Prepare by the following preparation steps:

[0058] Step S1, raw material preparation: select 1200 mesh silicon carbide according to the workpiece precision polishing processing requirements;

[0059] Step S2, preparing a coupling agent solution: mixing 1 kg of silicon carbide, adding 10 g of silane coupling agent and 40 g of anhydrous ethanol, and blending into a coupling agent solution;

[0060] Step S3, abrasive pretreatment: soak 1 kg of silicon carbide in a coupling agent solution, keep it soaked at room temperature for 1 hour, and air-dry it for 6 hours to form a coupling layer for standby use;

[0061] Step S4, material ratio: 500g of thermoplastic polyester elastomer TPU particles, 450g of silicon carbide, and 50g of carbon fiber are mixed evenly in a dry state, and the weight percentage of each component of the mixture is: 50% of thermoplastic polyester elastomer TPU particles, 45% of silicon carbide, and 5% of carbon fiber;

[0062] Step S5, granulation: pour the mixed material with good proportion into the mixer of the granulator for melt blending, the granulator is adjusted to a temperature of 200° C., melt blending for 10 minutes, to prepare a high polymer eutectic colloidal mixture, and then pass through the extrusion hole of the granulator to cool underwater and cut into cylindrical particles with a diameter of 2-4 mm and a length of 2-4 mm, drain the prepared composite elastic particles, and dry them;

[0063] Step S6, spheronization: pour the dried cylindrical particles into a spheronization barrel on a heated spheronization machine, set the rotation speed at 50 rpm, the heating temperature at 155°C, put in 1200 mesh silicon carbide, and spheronize for 7 minutes to form an outer layer, spheronizing spherical particles with a diameter of 3-7 mm and a mass of about 780 g;

[0064] Step S7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0065] Take equal amounts of the polishing abrasive obtained in the first embodiment, the polishing abrasive obtained in the second embodiment, and the polishing abrasive obtained in the third embodiment, use them in the polishing operation, test the polishing effect, and obtain the following table:

[0066] Table 1 Polishing effect evaluation

[0067]

[0068] As can be seen from Table 1, by comparing the polishing effects of the soft matrix elastic composite polishing abrasives prepared in Example 1, Example 2 and Example 3, it can be seen that the use of finer abrasives (such as silicon carbide, mesh number 1200) can significantly improve the polishing gloss and reduce the surface roughness, while the use of coarser abrasives (such as corundum, mesh number 100) is suitable for rough polishing. As the proportion of TPU increases, the polishing effect is improved in terms of stability and wear resistance, but the gloss and surface quality are reduced. There is a certain correlation between the polishing time and the required gloss. While increasing the fineness of the abrasive, the required polishing time can be appropriately reduced to achieve a rapid polishing effect. If the data is too little, more groups can be made.

[0069] Embodiment 4

[0070] This embodiment provides a technical solution: a soft matrix elastic composite polishing abrasive, including: 50A degree thermoplastic polyester elastomer TPU particles, 2mm bristles and 50um carbon fibers, wherein the thermoplastic polyester elastomer TPU particles are 700g, the bristles are 250g, and the carbon fibers are 50g.

[0071] Prepare by the following preparation steps:

[0072] Step V1, raw material preparation: select 2mm bristles according to the workpiece processing requirements;

[0073] Step V2, preparing a coupling agent solution: mixing 500 g of pig bristles, adding 10 g of silane coupling agent and 400 g of anhydrous ethanol, and blending into a coupling agent solution;

[0074] Step V3, abrasive pretreatment: soak 500 g of pig bristles in a coupling agent solution, keep soaking at room temperature for 2 hours, air-dry for 3 hours to form a coupling layer for standby use;

[0075] Step V4, material ratio: 700g of thermoplastic polyester elastomer TPU particles, 250g of pig bristles, and 50g of carbon fibers are mixed evenly in a dry state, and the weight percentage of each component of the mixture is: 70% of thermoplastic polyester elastomer TPU particles, 25% of pig bristles, and 5% of carbon fibers;

[0076] Step V5, granulation: pour the mixed material into the mixer of the granulator for melt blending, adjust the temperature of the granulator to 185°C, melt blend for 5 minutes, and prepare a high polymer eutectic colloidal mixture, and then pass through the extrusion hole of the granulator, cool it underwater and cut it into cylindrical particles with a diameter of 2-4mm and a length of 2-4mm;

[0077] Step V6, spheronization: pour the cylindrical particles formed by the granulator into a spheronization barrel on a heated spheronization machine for spheronization. The speed of the spheronization machine is modulated at 40 rpm, the heating temperature is between 160°C, and pig bristles of the same mesh size as those fused with the particles are added. The spheronization process is performed for 8 minutes to form an outer layer. The short fibers are completely melted into one body, and spherical particles with a diameter of 4-6 mm are spheronized to produce soft matrix composite elastic polishing abrasives. After the spheronization process is completed, the particles are poured out and sorted according to size.

[0078] Step V7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0079] Embodiment 5

[0080] This embodiment provides a technical solution: a soft matrix elastic composite polishing abrasive, including: 50A degree thermoplastic polyester elastomer TPU particles, 2mm wool and 50um carbon fiber, wherein the thermoplastic polyester elastomer TPU particles are 650g, the wool is 300g, and the carbon fiber is 50g.

[0081] Prepare by the following preparation steps:

[0082] Step V1, raw material preparation: select 2mm wool according to the workpiece processing requirements;

[0083] Step V2, preparing a coupling agent solution: mixing 500 g of wool, adding 10 g of silane coupling agent and 400 g of anhydrous ethanol, and blending into a coupling agent solution;

[0084] Step V3, abrasive pretreatment: soak 500 g of wool in a coupling agent solution, keep it soaked at room temperature for 1 hour, air-dry for 4 hours to form a coupling layer for standby use;

[0085] Step V4, material ratio: 650g of thermoplastic polyester elastomer TPU particles, 300g of wool, and 50g of carbon fiber are mixed evenly in a dry state, and the weight percentage of each component of the mixture is: 65% of thermoplastic polyester elastomer TPU particles, 30% of wool, and 5% of carbon fiber;

[0086] Step V5, granulation: pour the mixed material into the mixer of the granulator for melt blending, the granulator is adjusted to 190°C, melt blending for 6 minutes, to prepare a high polymer eutectic colloidal mixture, and then pass through the extrusion hole of the granulator, cool underwater and cut into cylindrical particles with a diameter of 2-4 mm and a length of 2-4 mm;

[0087] Step V6, spheronization: pour the cylindrical particles formed by the granulator into a spheronization barrel on a heated spheronization machine for spheronization. The speed of the spheronization machine is adjusted to 50 rpm, and the heating temperature is between 170°C. Put wool with the same mesh size as that of the granules and mix them together. Spheronization is carried out for 7 minutes to form an outer layer. The short fibers are completely melted into one, and spherical particles with a diameter of 4-6 mm are spheronized to produce soft matrix composite elastic polishing abrasives. After spheronization, pour them out and sort them according to size.

[0088] Step V7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0089] Embodiment 6

[0090] This embodiment provides a technical solution: a soft matrix elastic composite polishing abrasive, including: 50A degree thermoplastic polyester elastomer TPU particles, 2mm palm fiber and 50um carbon fiber, wherein the thermoplastic polyester elastomer TPU particles are 750g, the palm fiber is 200g, and the carbon fiber is 50g.

[0091] Prepare by the following preparation steps:

[0092] Step V1, raw material preparation: select 2mm palm fiber according to the workpiece processing requirements;

[0093] Step V2, preparing a coupling agent solution: mixing 500 g of palm fiber, adding 10 g of silane coupling agent and 400 g of anhydrous ethanol, and blending into a coupling agent solution;

[0094] Step V3, abrasive pretreatment: soak 500 g of palm fiber in a coupling agent solution, keep it soaked at room temperature for 1 hour, and air-dry it for 4 hours to form a coupling layer for standby use;

[0095] Step V4, material ratio: 750g of thermoplastic polyester elastomer TPU particles, 200g of palm fiber, and 50g of carbon fiber are mixed evenly in a dry state, and the weight percentage of each component of the mixture is: thermoplastic polyester elastomer TPU particles 75%, palm fiber 20%, carbon fiber 5%;

[0096] Step V5, granulation: pour the mixed material into the mixer of the granulator for melt blending, adjust the temperature of the granulator to 180°C, melt blend for 5 minutes, and prepare a high polymer eutectic colloidal mixture, and then pass through the extrusion hole of the granulator, cool it underwater and cut it into cylindrical particles with a diameter of 2-4mm and a length of 2-4mm;

[0097] Step V6, spheronization: pour the cylindrical particles formed by the granulator into a spheronization barrel on a heated spheronization machine for spheronization. The speed of the spheronization machine is modulated at 30 rpm and the heating temperature is between 150°C. Add palm fiber with the same mesh size as that of the particles and mix them together. Spheronization is performed for 6 minutes to form an outer layer. The short fibers are completely melted together to form spherical particles with a diameter of 4-6 mm, that is, soft matrix composite elastic polishing abrasives are manufactured. After spheronization, pour out and sort according to the size of the particles.

[0098] Step V7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0099] Embodiment 7

[0100] This embodiment provides a technical solution: a soft matrix elastic composite polishing abrasive, including: 50A degree thermoplastic polyester elastomer TPU particles, 2mm bristles, 2mm wool and 50um carbon fibers, wherein 600g of thermoplastic polyester elastomer TPU particles, 200g of bristles, 150g of wool and 50g of carbon fibers.

[0101] Prepare by the following preparation steps:

[0102] Step V1, raw material preparation: select 2mm bristles and 2mm wool according to the workpiece processing requirements;

[0103] Step V2, preparing a coupling agent solution: mixing 500 g of bristle and wool, adding 10 g of silane coupling agent and 400 g of anhydrous ethanol, and blending into a coupling agent solution;

[0104] Step V3, abrasive pretreatment: soak 500g of bristles and wool in a coupling agent solution, keep soaking at room temperature for 1 hour, air-dry for 4 hours to form a coupling layer for standby use;

[0105] Step V4, material ratio: 600g of thermoplastic polyester elastomer TPU particles, 200g of pig bristles, 150g of wool, and 50g of carbon fiber are mixed evenly in a dry state, and the weight percentage of each component of the mixture is: 60% of thermoplastic polyester elastomer TPU particles, 20% of pig bristles, 15% of wool, and 5% of carbon fiber;

[0106] Step V5, granulation: pour the mixed material into the mixer of the granulator for melt blending, adjust the temperature of the granulator to 200°C, melt blend for 4 minutes, and prepare a high polymer eutectic colloidal mixture, and then pass through the extrusion hole of the granulator, cool it underwater and cut it into cylindrical particles with a diameter of 2-4mm and a length of 2-4mm;

[0107] Step V6, spheronization: pour the cylindrical particles formed by the granulator into a spheronization barrel on a heated spheronization machine for spheronization. The speed of the spheronization machine is modulated at 60 rpm and the heating temperature is between 175°C. Put the bristles and wool of the same mesh size as those mixed with the particles and spheronize for 10 minutes to form an outer layer. The short fibers are completely melted into one body and spherical particles with a diameter of 4-6 mm are spheronized to produce soft matrix composite elastic polishing abrasives. After spheronization, pour out and sort by size particles.

[0108] Step V7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0109] Embodiment 8

[0110] This embodiment provides a technical solution: a soft matrix elastic composite polishing abrasive, including: 50A degree thermoplastic polyester elastomer TPU particles, 2mm wool and 50um carbon fiber, wherein the thermoplastic polyester elastomer TPU particles are 550g, the wool is 400g, and the carbon fiber is 50g.

[0111] Prepare by the following preparation steps:

[0112] Step V1, raw material preparation: select 2mm wool according to the workpiece processing requirements;

[0113] Step V2, preparing a coupling agent solution: mixing 500 g of wool, adding 10 g of silane coupling agent and 400 g of anhydrous ethanol, and blending into a coupling agent solution;

[0114] Step V3, abrasive pretreatment: soak 500 g of wool in a coupling agent solution, keep it soaked at room temperature for 1 hour, air-dry for 4 hours to form a coupling layer for standby use;

[0115] Step V4, material ratio: 550g of thermoplastic polyester elastomer TPU particles, 400g of wool, and 50g of carbon fiber are mixed evenly in a dry state, and the weight percentage of each component of the mixture is: 55% of thermoplastic polyester elastomer TPU particles, 40% of wool, and 5% of carbon fiber;

[0116] Step V5, granulation: pour the mixed material into the mixer of the granulator for melt blending, adjust the temperature of the granulator to 195°C, melt blend for 5 minutes, and prepare a high polymer eutectic colloidal mixture, and then pass through the extrusion hole of the granulator, cool it underwater and cut it into cylindrical particles with a diameter of 2-4mm and a length of 2-4mm;

[0117] Step V6, spheronization: pour the cylindrical particles formed by the granulator into a spheronization barrel on a heated spheronization machine for spheronization. The speed of the spheronization machine is adjusted to 50 rpm, and the heating temperature is between 180°C. Put wool with the same mesh size as that of the granules and mix them together, and spheronize for 8 minutes to form an outer layer. The short fibers are completely melted together and spherical particles with a diameter of 4-6 mm are spheronized to produce soft matrix composite elastic polishing abrasives. After spheronization, pour them out and sort them according to size.

[0118] Step V7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

[0119] Take equal amounts of the polishing abrasive obtained in Example 4, the polishing abrasive obtained in Example 5, the polishing abrasive obtained in Example 6, the polishing abrasive obtained in Example 7, and the polishing abrasive obtained in Example 8, use them in polishing operations, test the polishing effects, and obtain the following table:

[0120] Table 2 Polishing effect evaluation

[0121]

[0122] As can be seen from Table 2, by comparing the polishing effects of the soft matrix elastic composite polishing abrasives prepared in Example 4, Example 5, Example 6, Example 7 and Example 8, it can be seen that high-quality soft abrasives (such as wool) can significantly improve the polishing gloss and smoothness. When the TPU content is reduced, the polishing effect is improved, but an appropriate TPU ratio should be maintained to ensure good adhesion and stability. If the data is too little, more groups can be made.

[0123] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. Soft matrix elastic composite polishing abrasive, characterized in that: include: Base material, grinding sand and reinforcing filler, the base material is specifically thermoplastic polyester elastomer TPU (50A degree) particles, and the reinforcing filler is specifically carbon fiber.

2. The soft matrix elastic composite polishing abrasive according to claim 1, characterized in that: The grinding sand particles are specifically cutting abrasives, and the cutting abrasives are specifically corundum, aluminum oxide and silicon carbide. The particle size of the cutting abrasives is specifically 100-3000 meshes.

3. The soft matrix elastic composite polishing abrasive according to claim 2, characterized in that: The weight of the thermoplastic polyester elastomer TPU (50A degree) particles accounts for 50% to 65%, the weight of the cutting abrasive accounts for 30% to 45%, and the weight of the carbon fiber accounts for 5%.

4. The soft matrix elastic composite polishing abrasive according to claim 1, characterized in that: The grinding sand particles are specifically polishing abrasives, and the polishing abrasives are specifically pig bristles, wool and palm fibers. The length of the short fibers of the polishing abrasives is 1-3 mm.

5. The soft matrix elastic composite polishing abrasive according to claim 4, characterized in that: The weight of the thermoplastic polyester elastomer TPU (50A degree) particles accounts for 60% to 75%, the weight of the polishing abrasive accounts for 25% to 35%, and the weight of the carbon fiber accounts for 5%.

6. A method for preparing a soft matrix elastic composite polishing abrasive, characterized in that: The preparation method is applied to the polishing abrasive as claimed in claim 3, comprising the following steps: Step S1, raw material preparation: select the appropriate abrasive mesh size according to the workpiece processing requirements; Step S2, preparing a coupling agent solution: according to the mass of the functional hard abrasive, 1% silane coupling agent and 4% anhydrous ethanol are mixed to form a coupling agent solution; Step S3, abrasive pretreatment: pretreating the functional hard abrasive and the carbon fiber filler by soaking them in a silane coupling agent solution, and then air-drying the abrasive to form a coupling layer for standby use; Step S4, material ratio: mixing thermoplastic polyester elastomer TPU (50A degree) particles, functional hard abrasive, and carbon fiber (diameter 30-50um) evenly in a dry state; the weight percentage of each component of the mixture is: thermoplastic polyester elastomer TPU particles 50%-65%, abrasive 30%-45%, carbon fiber 5%; Step S5, granulation: pour the mixed material with a good ratio into the mixer of the granulator for melting and blending, the granulator is adjusted to a temperature of 180-200 degrees, the mixture is heated, stirred and extruded in the mixing and melting zone of the granulator, the TPU particles are plasticized into a viscous fluid, the functional abrasive and the carbon fiber filler are evenly integrated therein, and a polymer eutectic colloidal mixture is prepared, and then the mixture is cooled underwater through the extrusion hole of the granulator and cut into cylindrical particles with a diameter of 2-4 mm and a length of 2-4 mm, and the prepared composite elastic particles are drained and dried; Step S6, spheronization: pour the cylindrical particles formed and dried by the granulator into a spheronization barrel on a heated spheronization machine, the speed of the spheronization machine is modulated at 20-60 rpm, the heating temperature is between 150-180 degrees, and hard abrasive sand with the same mesh size as that mixed with the particles is added, and spheronization is performed for 5-8 minutes to form an outer layer, and spheronized spherical particles with a diameter of about (3-8mm) are spheronized to produce soft matrix composite elastic polishing abrasive; Step S7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

7. A method for preparing a soft matrix elastic composite polishing abrasive, characterized in that: The preparation method is applied to the polishing abrasive according to claim 5, comprising the following steps: Step V1, raw material preparation: select the 1-3mm short fiber hardness of the appropriate abrasive according to the workpiece processing requirements; Step V2, preparing a coupling agent solution: according to the functional soft hair and fiber mass, 1% silane coupling agent and 4% anhydrous ethanol are mixed to form a coupling agent solution; Step V3, abrasive pretreatment: pretreating the functional soft abrasive and the carbon fiber filler by soaking them in a silane coupling agent solution, and forming a coupling layer on the surface of the abrasive after air drying for standby use; Step V4, material ratio: mix thermoplastic polyester elastomer TPU (50A degree) particles, pre-treated functional soft abrasive, and carbon fiber (diameter 30-50um) evenly in a dry state, and the weight percentage of each component of the mixture is: thermoplastic polyester elastomer TPU particles 60%-75%, abrasive 25%-35%, carbon fiber 5%; Step V5, granulation: pour the mixed material with good proportion into the mixer of the granulator for melting and blending, the temperature of the granulator is adjusted to 180-200 degrees, the mixture is heated in the mixing and melting zone of the granulator, the TPU particles are plasticized into a viscous fluid, the functional soft abrasive and the carbon fiber filler are evenly integrated therein, and a polymer eutectic colloidal mixture is prepared, and then the mixture is cooled underwater through the extrusion hole of the granulator and cut into cylindrical particles with a diameter of 2-4 mm and a length of 2-4 mm; Step V6, spheronization: pour the cylindrical particles formed by the granulator into a spheronization barrel on a heated spheronization machine for spheronization. The speed of the spheronization machine is modulated at 20-60 rpm, and the heating temperature is between 150-180 degrees. Put in the soft abrasive short fibers with the same mesh size as the fused particles, and spheronize for 6-10 minutes to form an outer layer. The short fibers are completely melted into one, and spherical particles with a diameter of about (3-8mm) are spheronized to produce soft matrix composite elastic polishing abrasives. After spheronization, pour out and sort by size particles; Step V7, drying treatment: Dry the spheronized elastomer particles at room temperature for 4 hours, or dry them in a drying oven at 55-65 degrees for 60 minutes to complete the production.

Images