CN110861236A - Production method of precise elastic abrasive particles - Google Patents
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- CN110861236A CN110861236A CN201911150498.9A CN201911150498A CN110861236A CN 110861236 A CN110861236 A CN 110861236A CN 201911150498 A CN201911150498 A CN 201911150498A CN 110861236 A CN110861236 A CN 110861236A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
Abstract
The invention provides a production method of elastic abrasive cylindrical particles which are used for surface treatment, particularly 3D surface treatment consumable materials and have regular appearance, uniform granularity and precise size and are suitable for conventional processing technologies such as sand blasting, projection, vibration grinding, fluid dynamic grinding and the like. The elastic grinding material cylindrical particles are formed by mixing and extruding a thermoplastic elastomer which is easy to heat, extrude and draw wires and hard grinding material particles into monofilaments through an extruder and then precisely granulating the monofilaments. The elastic abrasive particles are suitable for removing burrs, flash, tool marks, wrinkles, electroplated layers, deposited layers, oxide films, mirror polishing, cutter passivation and other surfaces, particularly 3D surfaces of various soft and hard material precision workpieces such as rubber, plastics, wood, glass, ceramics, metal, sapphire, zirconia, diamond, hard alloy and the like by utilizing the normal-temperature or low-temperature sand blasting, projection, vibration grinding and fluid power grinding processes of compressed air, high-pressure water or liquid nitrogen.
Description
Technical Field
The invention belongs to the field of new materials, and relates to a production method of precise elastic abrasive particles, in particular to a production method of a consumable material for surface treatment of precise elastic abrasive particles, which is used for removing burrs, glue overflow, tool marks, wrinkles, electroplated layers, deposited layers, oxide films, mirror polishing, cutter passivation and the like on the surfaces of various soft and hard precise workpieces, particularly 3D surfaces, by using sand blasting, projection, vibration grinding and fluid dynamic grinding processes of compressed air, high-pressure water or liquid nitrogen at normal temperature or low temperature by a dry method or a wet method.
Background
The processing processes of precision workpieces in modern industrial production, such as mobile phone and computer watch shells, electronic component resin packaging, plastic rubber and silica gel precision parts, precision molds, glass sapphire 3D bending processing, drilling of Printed Circuit Boards (PCBs), cutter passivation and the like, all require that the processed workpieces have smooth surfaces, no burrs or rough edges and low surface roughness. The mechanical method mainly adopts surface treatment modes such as grinding wheel, sand paper, oilstone and gauze grinding, grinding brush, grinding paste, grinding fluid grinding, brush wire polishing, vibration grinding, sand blasting grinding and the like, has good treatment effects on irregular 3D surfaces by adopting sand blasting, projection, polishing and vibration grinding, can achieve the surface roughness of Ra0.008 microns by fine grinding by the mechanical method, and is the highest in all polishing methods. Chemical polishing is a method for dissolving and corroding surface burrs and surface films by using a solvent or a solution, and the surface roughness of a product can reach a semi-finished surface with Ra10 micrometers generally. The electrolytic process is similar to the chemical process except that the electrolytic process incorporates electrodes, such as the currently used anodization process, which can achieve a smooth surface with a surface roughness of Ra1 microns or less. Ultrasonic, fluid or magnetic flow methods are almost implemented by adopting a mixture of fluid and abrasive particles to assist in cutting, grinding and polishing the surface of a workpiece in a mode of applying impact force by fluid motion. The standard common in the industry is that the mirror polishing grade a0 is highest below ra0.008 micron, and the next a1 is 0.016 micron, which are all the levels of the aurora surface. However, the existing equipment, process and consumables have limitations in application range, most of the equipment, process and consumables have good polishing effect on straight surfaces, and the equipment, process and consumables have no effect on 3D surfaces with scale deformation such as bending, bosses, holes, gaps, acute angles and the like. If the surface roughness of the treated metal, glass and ceramic is higher when micron and millimeter hard ceramics, glass and metal particles or microbeads are directly used for sand blasting, the product generally generates frosting or matte effect, and the polishing effect requiring very low surface roughness is difficult to realize; common plastic particle abrasive materials such as nylon sand and frozen sand also have advantages in the aspects of sand blasting treatment of burrs, glue overflow and the like, and further required polishing effect cannot be achieved; if a grinding wheel, sand paper, abrasive cloth, oilstone polishing, or a grinding brush, grinding paste, grinding fluid polishing, or a brush wire sweeping or the like is used for polishing, the treatment effect on a plane or an approximate plane is good, and the irregular 3D surface, especially the 3D surface containing holes, gaps, acute angles, bosses and the like, is difficult to take care of everywhere; if the micron-sized submicron-sized hard abrasive micro-powder or particles are directly used for sand blasting, the micro-powder or particles cannot effectively impact the surface of a workpiece to be treated due to too small mass, and not only can polishing be realized, but also the cost is increased because compressed air flies everywhere or can not be recycled along with high-pressure water flow; in order to solve the problems, the invention provides a multifunctional ideal consumable material which has simple method, high efficiency, general equipment and process, can simultaneously meet the requirements of general plane and 3D surface treatment and can quickly remove burrs, rough edges, glue overflow, tool marks, wrinkles, polishing and passivation, and the invention adopts a thermoplastic elastomer as a carrier and hard abrasive particles with the average particle size D50 of 0.10-50 microns to be uniformly mixed and extruded to draw monofilaments, and then the monofilaments are cut into multi-specification cylindrical micro-particles with regular shapes, uniform sizes and precise sizes. The reason for adopting the thermoplastic elastomer which is easy to extrude into monofilaments is that firstly, the thermoplastic polymer material is convenient to process by using the conventional heating extrusion mixing equipment, the speed is high, the energy consumption is low, the cost is low, secondly, the thermoplastic polymer material is easy to mix with high-content inorganic hard abrasive particles, the elasticity loss of the mixed product is low, the elasticity of the abrasive particles can be ensured, thirdly, the contact surface of the elastic abrasive particles can be increased because of the elastic buffer when the elastic abrasive particles are used, no matter projected or cast, or collide with a processed workpiece along with compressed air or high-pressure water, not only the hard abrasive particles in the elastic abrasive particles can contact the workpiece more frequently to increase the impact, cutting, grinding and polishing probability, but also the elastic abrasive particles can generate surface contact sliding under a smaller impact angle because the elastic buffer delays the impact of the elastic abrasive particles, and therefore, the hard abrasive particles contained in the elastic abrasive particles can cut the workpiece, Grinding and polishing, the elastic abrasive particles can easily absorb impact kinetic energy and are not easy to break, thereby prolonging the service life of the elastic abrasive particles and reducing the production and processing cost, the raw material mixture is easy to heat and extrude to produce monofilaments with required uniform diameters, if the elastic abrasive particles are cut into the precise particles with the same length and the same monofilament diameter by using a special high-speed precise granulator of a patent product, the shape of the elastic abrasive particles can be ensured to be uniform, the size of the elastic abrasive particles is consistent, the size of the elastic abrasive particles is precise, the specification is various, the requirements of processed workpieces with different shapes and sizes on consumables can be met, and the precise processing is also convenient for the precise control of. If other plastics are added with high content of hard abrasive particles, the elasticity is too small or no elasticity, the materials are easy to be crushed and cannot be reused when in use, so that the use cost is increased, and the hard abrasive particles contained in the materials with too high hardness and no elasticity are difficult to expose and lack surface slippage after elastic deformation so as to be difficult to generate effective cutting, grinding and polishing capacity; if general rubber is used as a carrier, the curing process is needed to obtain elasticity, the processing time is long, the process is complicated, uniform monofilaments cannot be drawn, multi-specification microparticles with regular shapes, uniform particles and precise sizes are difficult to obtain, and if the microparticles are crushed and granulated, the microparticles are different in size, irregular in shape and wide in particle size distribution, so that the requirements on the 3D surface treatment process and effect precise control of precise parts cannot be met.
In the prior art, CN201410811088.5 describes that the abrasive is mixed with rubber, shaped, vulcanized and crushed into spherical elastic abrasive particles, and the shaping method of vulcanized rubber such as an open mill, an internal mixer, a calender and the like is adopted, while the plastic carrier is emphasized when an extruder is adopted, the plastic carrier is emphasized to be mixed, shaped, vulcanized and crushed into particles, the product is difficult to be made into spherical particles with uniform particle size, the particles are irregular in shape and wide in particle size distribution, and the plastic carrier basically loses elasticity after being added with the abrasive and is difficult to be made into elastic abrasive. The method is fundamentally different from the method that the thermoplastic elastomer adopted by the invention extrudes monofilaments and cuts the monofilaments into regular cylindrical particles. CN201410507956.0 describes an elastic abrasive material for attaching a hard abrasive material to an elastic core body with an irregular shape, the abrasive particles are easy to fall off, and although a method for regenerating and attaching abrasive particles is also described, the disadvantage is that the content of the attached abrasive particles is unstable, and it is difficult to adapt to the requirement of automatic continuous production, the core body with adhesion is easy to be bonded together to block a blasting circuit and adhere a workpiece while adhering the abrasive particles, which affects the requirement of automatic process and increases subsequent cleaning process, in addition, the fine abrasive particles falling off from the elastic core body in the blasting process fly with the wind under the action of pressure air flow, which not only is environmental protection poor, but also the wear of the abrasive particles is large, the analysis and metering required in the recovery and regeneration process of the abrasive particles and the core body are also difficult to be accurately controlled, and the proportion of the hard abrasive particles contained in the elastic abrasive material is unstable, thereby affecting the accurate time control of the blasting process on, the elastic abrasive material needs a special sand blasting machine and a sand blasting process thereof, cannot adapt to general equipment and processes on the market, has narrow adaptability, considers the changes of the shapes and cutting forces of abrasive particles before and after use and regeneration, has larger difference of sand blasting effects of a new abrasive material and the regenerated abrasive material on workpieces during the sand blasting process, is not easy to separate from removed burrs and scraps when recovering fine abrasive particles, is easy to cause the content of inaccurate effective abrasive particles in angle of repose detection to be unstable if the effective abrasive particles are regenerated together, and increases the cost if the effective abrasive particles are discarded together with the abrasive particles; CN201280063096.5 describes a resilient abrasive with a polyrotaxane with self-adhesion as the inner core and abrasive particles attached to the surface, the abrasive particles having a particle size of 0.10-1.20 microns, and the abrasive particle thickness is 1/4 microns of the diameter of the core body, if this value is met, the abrasive diameter should be 1.00-11.60 microns and is not in accordance with the described resilient abrasive particle size, the other contents and problems described are substantially in accordance with CN 201410507956.0; CN201711004408.6 proposes a thermoplastic elastic abrasive for polishing and its manufacturing method, which uses thermoplastic plastics or elastomer as carrier, and mixes, banburies, granulates, and injects the high content of abrasive micro powder with it to form the abrasive with the required shape, without describing the shape, granularity and usage of the abrasive, moreover, the size of the abrasive manufactured by injection molding method is difficult to be millimeter level, and is different from the precise elastic abrasive particles manufactured by the precise granulating method of the present invention. CN201510296557.9 describes an abrasive material in which a carrier is mixed with abrasive grains, and the granulating process is not described, and the abrasive material is not regarded as a precision elastic microparticle abrasive.
By combining the patent technologies, the method for producing the elastic abrasive particles with regular shape, uniform granularity and precise size, which are produced by granulating the monofilaments produced by uniformly mixing the thermoplastic elastomer and the hard abrasive particles inside and outside through the high-speed precise granulator of the patent equipment, can meet the requirement that the surface of universal equipment and process, particularly 3D surface treatment consumables in the current market have unique innovation, novelty and advancement.
Disclosure of Invention
The invention aims to provide a special multi-specification precise elastic abrasive particle surface treatment consumable which is suitable for the existing equipment and processes for sand blasting, projection, polishing, vibration grinding and the like on the market and is suitable for removing burrs, overflow glue, tool marks, wrinkles, polishing, electroplated layers, deposited layers, oxide films, cutter passivation and the like on the surfaces of various soft and hard materials such as rubber, plastic, wood, glass, ceramic, metal, zirconia, sapphire, diamond, hard alloy and the like, particularly irregular 3D surfaces.
In view of the performance requirements, production methods and applications of the precision resilient abrasive particles of the present invention, it is necessary to describe the details of the present invention in detail.
The thermoplastic elastomer TPE (thermoplastic elastomer) capable of being heated and extruded into monofilaments is mainly thermoplastic polyurethane elastomer TPU, thermoplastic polyester elastomer TPEE and thermoplastic polyamide elastomer TPAE, the hardness of the thermoplastic elastomer TPAE is 50-95A, the thermoplastic elastomer TPEE and the thermoplastic polyamide elastomer TPAE are easily mixed with hard abrasive particles in an extruder and heated and extruded into monofilaments with the uniform diameter of 0.10-2.00mm, the monofilaments have good elasticity and the elongation at break of 200-800%, and the monofilament is very suitable for the carrier for the elastic abrasive particles required by the invention.
For the purpose of stabilizing the properties of the elastomeric abrasive particle product during processing and use, it is necessary to add suitable auxiliaries, such as antioxidants, lubricants, coupling agents, dispersants, heat stabilizers, light stabilizers, antistatic agents, or pigments or dyes having color requirements for the product, which may be directly selected from color concentrates, to the thermoplastic elastomer used during extrusion of the monofilament.
The hard abrasive particles adopted by the invention are one or a mixture of more than two of hard material particles with cutting, grinding and polishing capabilities, such as diamond, cubic boron nitride, boron carbide, silicon carbide, tungsten carbide, alumina, zirconia, cerium oxide, glass beads and the like, the average particle size D50 is 0.10-50 microns, preferably 0.05-20 microns, and the particle size normal distribution of each specification is as narrow as possible in specific use so that the treatment effect can be accurately controlled.
In order to effectively utilize the cutting, grinding and polishing performances of the hard abrasive particles, the content of the hard abrasive particles in the precise elastic abrasive particle product is controlled to be between 15 and 65 percent, if the content of the hard abrasive particles is smaller, the hard abrasive particles cannot exert a larger effect, and if the content of the hard abrasive particles is too high, monofilaments are not easy to draw, even the elasticity of the elastic abrasive particle product is influenced, so that the significance of the elastic abrasive particles is lost.
The invention adopts an extruder to mix and extrude the thermoplastic elastomer and the hard abrasive particles to produce monofilaments, the extruder can use a single screw extruder, a double screw extruder or a multi-screw extruder, in view of the excellent mixing and extruding characteristics and the cost performance of the double screw extruder, the double screw extruder with wear-resistant material is preferred to be convenient to disassemble, maintain and replace, the double screw extruder is used as the monofilament production equipment used by the invention, according to the requirements of the drafting and winding parts of the common monofilament production equipment on the yield and the yield of the common double screw extruder, the diameter of the extruder is selected to be 25-50 mm, the length-diameter ratio is 24-40, a side feeding and vacuumizing device is preferably configured, the side feeding is a double screw metering powder forced feeding machine, the hard abrasive particles can be quantitatively and forcibly added to the middle section of the extruder to be mixed with the fused thermoplastic elastomer melt, and the adding mode is compared with the mode that the thermoplastic elastomer and the abrasive particles are firstly mixed and then added The wear degree of the grinding particles to the thread block and the machine barrel of the extruder is small, and the length of the thread block and the machine barrel which need to be maintained and replaced after being worn is also short, so that the maintenance cost of equipment is reduced.
The extruded monofilaments are cooled, drawn, sized and rolled to be the conventional technical process for monofilament production, and each monofilament product is independently rolled into a filament tube.
The produced monofilament fiber cylinder containing hard abrasive micro powder is transferred to a production line of a high-speed precision granulator to be cut into precision micro-particles with the length consistent with the diameter of the monofilament and the error of +/-0.05 mm, and then the elastic abrasive micro-particle product is obtained.
Drawings
FIG. 1 is a diagram of a precision resilient abrasive particle product produced using the techniques of the present invention.
Detailed Description
Example one
The raw material formula is as follows:
1. TPU 3690AU 65 kg German scientific wound
2. Diamond particle D501 micron 30 kg Henan Huanghe He cyclone
3. Coupling agent KH-550300 g was commercially available
4. Acetone 1000 ml is commercially available
5. Silicone oil 201500 g is commercially available
6. Antioxidant 1010200 g swiss bus
7. Antioxidant 168200 g swiss bus
8. Antistatic agent master batch GW-90933 kg Shenzhen gold labeling chemical industry
Monofilament production
1. The TPU is dried in a dehumidifying or vacuum drier at 80 ℃ for 5 hours.
2. The diamond particles are dried in a hot air oven at 120 ℃ for 10 hours, and 30 kg of the diamond particles are weighed and added into a stirring mixer.
3. 300 g of KH-550 coupling agent is diluted uniformly by 1000 ml of acetone and then added into a stirring mixer to be stirred and mixed uniformly with 30 kg of diamond particles for later use.
4. Weighing TPU and various auxiliaries according to the proportion requirement, adding into a stirring mixer, uniformly mixing, and adding into a double-screw extruder hopper.
5. Adding the diamond particles treated by the coupling agent into a side feeding hopper of a double-screw extruder.
6. Calibrating a relation curve of the feeding rotating speed and the feeding amount of the extruder and a relation curve of the feeding rotating speed and the feeding amount of the side feeding machine in advance, and determining the feeding amounts corresponding to the rotating speed of the extruder, the feeding rotating speed of the extruder and the rotating speed of the side feeding machine according to the proportion required by the formula.
7. The mixture strand was extruded at 190 ℃ and cooled in a water bath, drawn, sized, and wound into elastomeric abrasive filaments having a diameter of 0.50 mm.
8. The elastic abrasive monofilament cylinder is transported to a precision dicing production line to be cut into cylindrical elastic abrasive microparticles with the length of 0.50mm and the content of 1 micron diamond particles of 30 percent.
Example two
The raw material formula is as follows:
1. TPU 3690AU 45 kg German scientific wound
2. Diamond particle D501 micron 50 kg Henan Huanghe He cyclone
3. Coupling agent KH-550500 g was commercially available
4. Acetone 1500 ml commercially available
5. Silicone oil 201500 g is commercially available
6. Antioxidant 1010200 g swiss bus
7. Antioxidant 168200 g swiss bus
8. Antistatic agent master batch GW-90933 kg Shenzhen gold labeling chemical industry
Monofilament production
1. The TPU is dried in a dehumidifying or vacuum drier at 80 ℃ for 5 hours.
2. The diamond particles are dried in a hot air oven at 120 ℃ for 10 hours, and 50 kg of the diamond particles are weighed and added into a stirring mixer.
3. 500 g of KH-550 coupling agent is diluted uniformly with 1500 ml of acetone and then added into a stirring mixer to be stirred and mixed uniformly with 50 kg of diamond particles for later use.
4. Weighing TPU and various auxiliaries according to the proportion requirement, adding into a stirring mixer, uniformly mixing, and adding into a double-screw extruder hopper.
5. Adding the diamond particles treated by the coupling agent into a side feeding hopper of a double-screw extruder.
6. Calibrating a relation curve of the feeding rotating speed and the feeding amount of the extruder and a relation curve of the feeding rotating speed and the feeding amount of the side feeding machine in advance, and determining the feeding amounts corresponding to the rotating speed of the extruder, the feeding rotating speed of the extruder and the rotating speed of the side feeding machine according to the proportion required by the formula.
7. The mixture strand was extruded at 190 ℃ and cooled in a water bath, drawn, sized, and wound into elastomeric abrasive filaments having a diameter of 0.50 mm.
8. The elastic abrasive monofilament cylinder is transported to a precision dicing production line to be cut into cylindrical elastic abrasive microparticles with the length of 0.50mm and the content of 1 micron diamond particles of 50 percent.
EXAMPLE III
1. TPU 3690AU 65 kg German scientific wound
2. Boron carbide particle D502 micron 30 kg Zhengzhou Songshan chemical industry
3. Coupling agent KH-550300 g was commercially available
4. Acetone 1000 ml is commercially available
5. Silicone oil 201500 g is commercially available
6. Antioxidant 1010200 g swiss bus
7. Antioxidant 168200 g swiss bus
8. Antistatic agent master batch GW-90933 kg Shenzhen gold labeling chemical industry
Monofilament production
1. The TPU is dried in a dehumidifying or vacuum drier at 80 ℃ for 5 hours.
2. The boron carbide particles are dried in a hot air oven at 120 ℃ for 10 hours, and 30 kg of the boron carbide particles are weighed and added into a stirring mixer.
3. 300 g of KH-550 coupling agent is diluted uniformly by 1000 ml of acetone and then added into a stirring mixer to be stirred and mixed uniformly with 30 kg of boron carbide particles for later use.
4. Weighing TPU and various auxiliaries according to the proportion requirement, adding into a stirring mixer, uniformly mixing, and adding into a double-screw extruder hopper.
5. Adding the boron carbide particles treated by the coupling agent into a side feeding hopper of a double-screw extruder.
6. Calibrating a relation curve of the feeding rotating speed and the feeding amount of the extruder and a relation curve of the feeding rotating speed and the feeding amount of the side feeding machine in advance, and determining the feeding amounts corresponding to the rotating speed of the extruder, the feeding rotating speed of the extruder and the rotating speed of the side feeding machine according to the proportion required by the formula.
7. The mixture strand was extruded at 190 ℃ and cooled in a water bath, drawn, sized, and wound into elastomeric abrasive filaments having a diameter of 0.50 mm.
8. And (3) transferring the elastic abrasive monofilament spool to a precision pelletizing production line to cut the elastic abrasive monofilament spool into cylindrical elastic abrasive microparticles with the length of 0.50mm and the content of 2-micron boron carbide particles of 30 percent.
Example four
The raw material formula is as follows:
1. TPEE 635670 kg U.S. DuPont
2. Silicon carbide particle D501 micron 30 kg Shandong Shantian grinding
3. Coupling agent KH-560300 g was commercially available
4. Acetone 1000 ml is commercially available
5. Silicone oil 1 kg is commercially available
6. Antioxidant 1010200 g swiss bus
7. Antioxidant 168200 g swiss bus
Monofilament production
1. The TPEE was dried in a moisture or vacuum drier at 100 c for 5 hours.
2. The silicon carbide particles are dried in a hot air oven at 120 ℃ for 10 hours, and 30 kg of the silicon carbide particles are weighed and added into a stirring mixer.
3. 300 g of KH-560 coupling agent is diluted uniformly with 1000 ml of acetone and then added into a stirring mixer to be stirred and mixed uniformly with silicon carbide particles for later use.
4. Weighing TPEE and various additives according to the proportion requirement, adding the TPEE and various additives into a stirring mixer, uniformly stirring and mixing, and then adding the mixture into a double-screw extruder hopper.
5. Silicon carbide particles are added into a side feeding hopper of a double-screw extruder.
6. Calibrating a relation curve of the feeding rotating speed and the feeding amount of the extruder and a relation curve of the feeding rotating speed and the feeding amount of the side feeding machine in advance, and determining the feeding amounts corresponding to the rotating speed of the extruder, the feeding rotating speed of the extruder and the rotating speed of the side feeding machine according to the proportion required by the formula.
7. The mixture strand was extruded at 260 ℃ and cooled in a water bath, drawn, sized, and wound into elastomeric abrasive filaments having a diameter of 0.30 mm.
8. The elastic abrasive monofilament tube is transported to a precision pelletizing production line and cut into cylindrical elastic abrasive particles with the length of 0.30mm and the content of 1 micron silicon carbide particles of 30 percent.
EXAMPLE five
The raw material formula is as follows:
1. TPEE 635670 kg U.S. DuPont
2. Silicon carbide particle D503 micron 30 kg Shandong Shantian grinding
3. Coupling agent KH-560300 g was commercially available
4. Acetone 1000 ml is commercially available
5. Silicone oil 1 kg is commercially available
6. Antioxidant 1010200 g swiss bus
7. Antioxidant 168200 g swiss bus
Monofilament production
1. The TPEE was dried in a moisture or vacuum drier at 100 c for 5 hours.
2. The silicon carbide particles are dried in a hot air oven at 120 ℃ for 10 hours, and 30 kg of the silicon carbide particles are weighed and added into a stirring mixer.
3. 300 g of KH-560 coupling agent is diluted uniformly with 1000 ml of acetone and then added into a stirring mixer to be stirred and mixed uniformly with silicon carbide particles for later use.
4. Weighing TPEE and various additives according to the proportion requirement, adding the TPEE and various additives into a stirring mixer, uniformly stirring and mixing, and then adding the mixture into a double-screw extruder hopper.
5. Silicon carbide particles are added into a side feeding hopper of a double-screw extruder.
6. Calibrating a relation curve of the feeding rotating speed and the feeding amount of the extruder and a relation curve of the feeding rotating speed and the feeding amount of the side feeding machine in advance, and determining the feeding amounts corresponding to the rotating speed of the extruder, the feeding rotating speed of the extruder and the rotating speed of the side feeding machine according to the proportion required by the formula.
7. The mixture strand was extruded at 260 ℃ and cooled in a water bath, drawn, sized, and wound into elastomeric abrasive filaments having a diameter of 0.30 mm.
8. The elastic abrasive monofilament tube is transported to a precision pelletizing production line and cut into cylindrical elastic abrasive particles with the length of 0.30mm and the content of 3 micron silicon carbide particles of 30 percent.
The above examples only partially illustrate the process technology formulation and the production method of the present invention, and are not limited to other formulations and processes known in the art for producing the precision elastic abrasive particle products described in the present invention, and all formulations, processes and products for producing precision elastic abrasive particles by using the mixed extrusion, monofilament and grain cutting of the present invention are included in the present invention.
Effects of the invention
The elastic abrasive particle product produced by the technology has the following sand blasting polishing effects on a sapphire watch cover, a zirconia ceramic mobile phone shell and a 50 multiplied by 50mm S316 stainless steel plate respectively, and the results are measured by a Hommelt T1000 surface roughness meter:
ra in microns
Through product tests, the technical product of the invention achieves the required result.
Claims (10)
1. A method for producing precise elastic abrasive particles, characterized by: drying thermoplastic elastomer TPE which is easy to be drawn into monofilaments, uniformly mixing the TPE with hard abrasive particles and necessary auxiliaries in an extruder, extruding the mixture into monofilaments with required diameters, and then cutting the monofilaments into cylindrical elastic abrasive particles with regular shape, uniform granularity and precise size, wherein the length of the cylindrical elastic abrasive particles is consistent with the diameter of the monofilaments by using a precise granulator.
2. A method for producing precision elastic abrasive grains according to claim 1, characterized in that: the thermoplastic elastomer TPE is a high polymer material which is easily heated, melted and extruded into monofilaments, and comprises but is not limited to thermoplastic polyurethane elastomer TPU, thermoplastic polyester elastomer TPEE and thermoplastic polyamide elastomer TPAE.
3. A method for producing precision elastic abrasive grains according to claims 1 and 2, characterized in that: the hard abrasive particles are one or a mixture of more than two of hard material particles with cutting, grinding and polishing capabilities, such as diamond, cubic boron nitride, boron carbide, silicon carbide, tungsten carbide, alumina, zirconia, cerium oxide, glass beads and the like.
4. A method of producing fine resilient abrasive particles according to claims 1 to 3, wherein: the hard abrasive particles have an average particle size D50 of 0.10 to 50 microns, preferably 0.50 to 20 microns.
5. A method of producing fine resilient abrasive particles according to claims 1 to 4, wherein: the extruder comprises a single-screw extruder, a double-screw extruder or a multi-screw extruder, and the double-screw extruder with better cost performance and mixing effect is preferably selected.
6. A method of producing fine resilient abrasive particles according to claims 1 to 5, wherein: the composition ratio of the elastic abrasive particles is 30-80% of thermoplastic elastomer, 15-65% of hard abrasive particles and about 5% of other auxiliary agents or master batches.
7. A method of producing fine resilient abrasive particles according to claims 1 to 6, wherein: the diameter of the elastic abrasive monofilament is 0.10-2.00 mm.
8. A method of producing fine resilient abrasive particles according to claims 1 to 7, wherein: the precision granulator is a high-speed precision granulator disclosed in patent CN201510293675.4, and has the particularity that the precision granulator can precisely granulate soft rubber-like filaments with large elongation (the elongation is more than 100%).
9. A method of producing fine resilient abrasive particles according to claims 1 to 8, wherein: the specification of the elastic abrasive particle product is 0.10-2.00mm of cylinder particles with the length consistent with the diameter of the elastic abrasive particle product.
10. A method of producing fine resilient abrasive particles according to claims 1 to 9, wherein: the elastic abrasive particles are suitable for removing burrs, flash, tool marks, wrinkles, electroplated layers, deposited layers, oxide films, mirror polishing, cutter passivation and other surfaces, particularly 3D surfaces of various soft and hard material precision workpieces such as rubber, plastics, wood, glass, ceramics, metal, sapphire, zirconia, diamond, hard alloy and the like by utilizing the normal-temperature or low-temperature sand blasting, projection, vibration grinding and fluid power grinding processes of compressed air, high-pressure water or liquid nitrogen.
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| CN201911150498.9A Pending CN110861236A (en) | 2019-11-21 | 2019-11-21 | Production method of precise elastic abrasive particles |
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| CN112406129A (en) * | 2020-10-29 | 2021-02-26 | 清华大学 | Production method and production system of rubber part |
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