Abrasive sharpening wire and preparation method and application thereof

Abstract

The invention discloses an abrasive sharpening wire and a preparation method and application thereof, and belongs to the technical field of abrasive wires. The preparation method of the grinding material sharpening wire comprises the following steps: S01, mixing 70-90 parts by mass of a base material and 0.4-0.6 part by mass of a lubricant, and adding the mixture into a double-screw hopper; 0.4-0.7 part by mass of a coupling agent and 5-40 parts by mass of a grinding material are mixed, dried and screened, and then the mixture is added into a double-screw side feeding hopper; the temperature of the double-screw extruder is 180-275 DEG C; s02, the extruded silk material is stretched and shaped after being cooled; and S03, the shaped abrasive sharpened wire intermediate product is put into corrosive liquid to be subjected to corrosion treatment, cleaning and drying are conducted, and the abrasive sharpened wire is obtained. According to the abrasive sharpening wire, the diameter of the tip of the sharpening wire is effectively reduced, a workpiece is prone to making contact with a groove or a connector when treated, and dead corners are not prone to being left; in addition, the abrasive sharpening wire retains the rigidity of the brush wire main body, and the use effect and the service life are not affected.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of abrasive filaments, and particularly relates to an abrasive pointed filament and a preparation method and application thereof. BACKGROUND

[0002] The existing abrasive filament products are mostly made of nylon base material and mineral powder abrasive, and have a relatively large diameter, and can be used for cleaning, polishing and polishing treatment of marble, metal and ceramic products.

[0003] The abrasive filament disclosed in the patent CN104562286A is prepared by adding an additive and abrasive to polyamide and polyethylene, and has certain anti-fouling performance, and is suitable for processing flat workpieces.

[0004] The existing abrasive filament products have a flat section, that is, a flat abrasive filament, and the abrasive filament tip is not easy to contact the groove or interface position when processing the surface of a workpiece, and a dead angle that is not processed is easily left. SUMMARY

[0005] The present application provides an abrasive pointed filament and a preparation method and application thereof, and aims to solve the problem that the existing abrasive filaments are mostly flat abrasive filaments, the abrasive filament tip is not easy to contact the groove or interface position when processing the surface of a workpiece, and a dead angle that is not processed is easily left.

[0006] The technical solution of the present application is as follows:

[0007] A preparation method of an abrasive pointed filament, comprising the following steps:

[0008] S01. Mix 70-90 parts by mass of a base material and 0.4-0.6 parts by mass of a lubricant, and add them into a double-screw hopper; mix 0.4-0.7 parts by mass of a coupling agent and 5-40 parts by mass of abrasive, dry and sieve them, and then add them into a double-screw side feeder; and the temperature of a double-screw extruder is 180-275 DEG C;

[0009] S02. Stretch the extruded filament material after cooling at a stretching ratio of 2-3.5 times; and shape the stretched product by using a hot air machine;

[0010] S03. Put the shaped abrasive pointed filament intermediate product into a corrosion liquid for corrosion treatment; and clean and dry the filament bundle after the corrosion is completed, to obtain the abrasive pointed filament.

[0011] In step S01,

[0012] Preferably, the base material is one or more of polyester, polyolefin or polyamide;

[0013] Further preferably, the polyester is preferably at least one or two or more of polybutylene terephthalate, polyethylene terephthalate, TPEE or PTT;

[0014] The polyamide is preferably nylon 612, 610 or pa6, etc.

[0015] Preferably, the base material needs to be dried before use, and the drying temperature is 100-130℃.

[0016] Preferably, the abrasive is at least one of silicon carbide, alumina or diamond abrasive.

[0017] The lubricant is one or both of polyethylene wax and vinyl bis-stearamide.

[0018] The coupling agent is one of silane coupling agent, titanate coupling agent or aluminum-titanium composite series.

[0019] Preferably, in step S01, a toughening agent is also added to the mixed material in the double screw hopper, and the amount of the toughening agent is 4-6 parts by mass, and the toughening agent is the same plastic as the base material system. Further preferably, when the base material is a polyester material, the toughening agent is a thermoplastic polyester elastomer; when the base material is a polyamide material, the toughening agent is at least one of nylon elastomer and copolymer nylon; when the base material is a polyolefin material, the toughening agent is at least one of polyolefin elastomer and metallocene polyolefin. Using the same system material as the toughening agent has less effect on the heat resistance and strength of the abrasive wire itself, and at the same time, when chemical sharpening is carried out, the reaction rate of the base material and the toughening agent of the sharpened abrasive wire with the sharpening liquid is relatively close, and the shape consistency of the sharpened abrasive wire is good. The 4-6 parts by mass of the toughening agent added in the present application increases the toughness of the abrasive sharpened wire, while does not affect the original hardness characteristics of the abrasive sharpened wire, and does not affect the lubricating effect of the lubricant; on the basis of not changing the original performance of the sharpened wire, the toughness performance of the product can be significantly improved.

[0020] In step S02,

[0021] Preferably, the shaping temperature of the shaping is 150-210℃.

[0022] In step S03,

[0023] Preferably, the shaped abrasive wire tip intermediate product is obtained by packaging the shaped product of step S02 into a cylindrical shape.

[0024] The etching liquid is one of an alkaline etching liquid or an acid etching liquid.

[0025] The alkaline etching liquid is prepared from food-grade sodium hydroxide and water in a mass fraction ratio of 35%-40%; the etching treatment conditions of the alkaline etching liquid are: etching treatment temperature 100-120℃, etching treatment time 30-60min.

[0026] The acid etching liquid is a 20% mass fraction sulfuric acid solution; the etching treatment conditions of the acid etching liquid are: etching treatment temperature 100-120℃, etching treatment time 100-120min.

[0027] An abrasive wire tip is obtained by the above preparation method.

[0028] The above abrasive wire tip is applied in the preparation of a grinding brush. The grinding brush obtained can be used for cleaning, polishing and polishing treatment of the surfaces of marble, metal, ceramic products and the like.

[0029] The abrasive wire tip is obtained by using one or several of polyester, polyolefin or polyamide as a base material, adding a lubricant, a coupling agent and an abrasive to the base material, and extruding the abrasive wire tip.

[0030] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0031] The abrasive wire tip effectively reduces the diameter of the tip of the abrasive wire tip, making it easier to contact the grooves or interfaces when processing workpieces, and less likely to leave dead angles; the brush wire moves at high speed on the surface of the workpiece when processing the workpiece, and high-speed friction can cause the contact surface to overheat, and the gap between the tapered tips of the abrasive wire tips is beneficial to rapid heat dissipation; in addition, the abrasive wire tip retains the rigidity of the main body of the brush wire, and the use effect and service life are not affected. For some workpiece surfaces that need to be finely polished, the use of a grinding brush made of abrasive wire tips can achieve better surface flatness. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is an enlarged view of the tip of the abrasive wire tip (curved wire) prepared in the embodiments of the present application;

[0033] Figure 2 is a schematic view of a grinding brush made of a conventional abrasive wire;

[0034] Figure 3This is a schematic diagram of a grinding brush made from the abrasive tip wire prepared in an embodiment of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] Currently, most existing abrasive wires are flat-headed, which makes it difficult for the wire tip to reach grooves or interfaces when processing workpiece surfaces, leaving untreated dead zones. Furthermore, simply reducing the wire diameter reduces the overall rigidity of the product, affecting processing efficiency and lifespan. To address these technical problems, this invention proposes an abrasive tip wire and its preparation method.

[0038] Example 1

[0039] A method for preparing abrasive tipping wire, specifically including the following steps:

[0040] (1). The polybutylene terephthalate was dried using a dryer at a temperature of 110°C;

[0041] (2). Weigh the dried polybutylene terephthalate, polyethylene wax, silane coupling agent and silicon carbide abrasive according to the formula. The formula is: polybutylene terephthalate (70 parts by weight) + silicon carbide (29 parts by weight) + polyethylene wax (0.6 parts by weight) + silane coupling agent (0.4 parts by weight);

[0042] (3) Mix the weighed polybutylene terephthalate and polyethylene wax and add them to the twin-screw hopper; mix the weighed silane coupling agent and silicon carbide abrasive, dry and sieve them, and add them to the twin-screw side feed hopper; the temperature of the twin-screw extruder is 200-250℃;

[0043] (4) The extruded resin is cooled and then stretched, with a stretching ratio of 2 times;

[0044] (5) The stretched product is shaped by a hot air blower at a temperature of 200-210℃;

[0045] (6) The shaped product is recycled and packaged into a cylindrical shape to obtain the intermediate product of abrasive tipping wire;

[0046] (7). Pack the intermediate product of abrasive grinding wire and put it into the etching solution for etching treatment. The etching solution is prepared by food-grade sodium hydroxide and water in a mass fraction of 40%. The temperature of the etching solution is 100℃ and the treatment time is 60min.

[0047] (8) The etched wire bundles are cleaned and dried, and then packaged to obtain abrasive tipping wire products.

[0048] Example 2

[0049] Another method for preparing abrasive tipping wire specifically includes the following steps:

[0050] (1). The polyethylene terephthalate was dried using a dryer at a temperature of 130°C;

[0051] (2). Weigh the dried polyethylene terephthalate, polyethylene wax, thermoplastic polyester elastomer, silane coupling agent and alumina abrasive according to the formula. The formula is as follows: polyethylene terephthalate (79 parts by weight) + alumina abrasive (20 parts by weight) + thermoplastic polyester elastomer (5 parts by weight) + polyethylene wax (0.4 parts by weight) + silane coupling agent (0.6 parts by weight);

[0052] (3) Mix the weighed polyethylene terephthalate, thermoplastic polyester elastomer and polyethylene wax and add them to the twin-screw hopper; mix the weighed silane coupling agent and alumina abrasive, dry and sieve them and add them to the twin-screw side feed hopper; the temperature of the twin-screw extruder is 240-275℃;

[0053] (4) The extruded resin is cooled and then stretched, with a stretching ratio of 3 times;

[0054] (5) The stretched product is shaped by a hot air blower at a temperature of 150-160℃.

[0055] (6) The shaped product is recycled and packaged into a cylindrical shape to obtain the intermediate product of abrasive tipping wire;

[0056] (7). Pack the intermediate product of abrasive grinding wire and put it into the etching solution for etching treatment. The etching solution is made of food-grade sodium hydroxide and water in a mass fraction of 35%. The temperature of the etching solution is 120℃ and the treatment time is 30min.

[0057] (8) The etched wire bundles are cleaned and dried, and then packaged to obtain abrasive tipping wire products.

[0058] A magnified image of the curved tip of the prepared abrasive grinding wire is shown below. Figure 1 As shown. Figure 1 The data shows that the abrasive filaments treated with the etching solution are abrasive filaments with curved tips.

[0059] Example 3

[0060] Another method for preparing abrasive tipping wire includes the following steps:

[0061] (1). Dry Nylon 612 using a dryer at a drying temperature of 100℃;

[0062] (2). Weigh the dried nylon 612, vinyl bis-stearamide, titanate coupling agent and diamond abrasive according to the formula. The formula is: nylon 612 (83.8 parts by weight) + diamond abrasive (15 parts by weight) + vinyl bis-stearamide (0.5 parts by weight) + titanate coupling agent (0.7 parts by weight);

[0063] (3) Mix the weighed polynylon 612 and vinyl bis-stearamide and add them to the twin-screw hopper; mix the weighed titanate coupling agent and diamond abrasive, dry and sieve them and add them to the twin-screw side feed hopper; the temperature of the twin-screw extruder is 180~245℃;

[0064] (4) The extruded resin is cooled and then stretched to a stretch ratio of 3.5 times;

[0065] (5) The stretched product is shaped by a hot air blower at a temperature of 170-190℃.

[0066] (6) The shaped product is recycled and packaged into a cylindrical shape to obtain the intermediate product of abrasive tipping wire;

[0067] (7) Pack the intermediate product of the abrasive tip wire and put it into the etching solution for etching treatment. The etching solution is a sulfuric acid solution with a mass fraction of 20% and a temperature of 120℃. The treatment time is 120min.

[0068] (8) The etched wire bundles are cleaned and dried, and then packaged to obtain abrasive tipping wire products.

[0069] The abrasive tips prepared in Examples 1-3 use materials from the same system as toughening agents, which has little impact on the heat resistance and strength of the abrasive tips themselves. At the same time, during chemical grinding, the reaction rates of the base material and toughening agent of the abrasive tips with the grinding fluid are relatively close, resulting in good shape consistency of the abrasive tips.

[0070] Conventional abrasive filaments have diameters between 0.25mm and 3.0mm. The abrasive filaments prepared in Examples 1-3, after being sharpened, have a peak diameter of less than or equal to 0.08mm. Reducing the diameter of the brush tip to less than one-third of its original size allows the grinding brush made with sharpened abrasive filaments to more easily penetrate into the dead corners or gaps of the workpiece, while having less impact on the strength of the abrasive filament itself. For some workpiece surfaces requiring fine grinding, using grinding brushes made with sharpened abrasive filaments results in better surface smoothness.

[0071] Application Examples

[0072] A schematic diagram of an abrasive brush made from conventional abrasive filaments is shown below. Figure 2 As shown, the brush bristles of the abrasive brush have a flat-head structure. When processing the surface of the workpiece, the tip of the abrasive bristles is not easy to contact the groove or interface, which can easily leave dead corners that cannot be processed. If the diameter of the abrasive bristles is reduced indiscriminately, the overall rigidity of the product will be reduced, which will affect the processing effect and service life.

[0073] The schematic diagram of the grinding brush made from the abrasive tip wire prepared using Examples 1-3 of this invention is shown below. Figure 3 As shown, the brush bristles of the grinding brush have a tapered tip structure. When processing the workpiece, the brush bristles move at high speed relative to the workpiece surface. High-speed friction can cause the contact surface to overheat. The gap between the tapered grinding tips is conducive to rapid heat dissipation. In addition, the abrasive grinding tips retain the rigidity of the brush bristle body, so the performance and lifespan are not affected.

[0074] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0075] The abrasive tip of this invention effectively reduces the diameter of the tip, making it easier to contact grooves or interfaces when processing workpieces and less likely to leave dead corners. When processing workpieces, the brush bristles move at high speed relative to the workpiece surface. High-speed friction can cause the contact surface to overheat. The gap between the tapered tips of the abrasive tip facilitates rapid heat dissipation. In addition, the abrasive tip retains the rigidity of the brush bristle body, so the performance and lifespan are not affected.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing abrasive grinding tips, characterized in that: Includes the following steps: S01. Take 70-90 parts by weight of base material and 0.4-0.6 parts by weight of lubricant, mix them, and add them to the twin-screw hopper; take 0.4-0.7 parts by weight of coupling agent and 5-40 parts by weight of abrasive, mix them, dry and sieve them, and add them to the twin-screw side feed hopper; the temperature of the twin-screw extruder is 180-275℃; S02. The extruded filaments are cooled and then stretched to a stretch ratio of 2-3.5 times; the stretched product is then shaped using a hot air blower. S03. The shaped abrasive tip wire intermediate product is placed in an etching solution for etching treatment; the etched wire bundle is cleaned and dried to obtain the abrasive tip wire.

2. The method for preparing abrasive grinding tips according to claim 1, characterized in that: In step S01, the base material is one or more of polyester, polyolefin or polyamide.

3. The method for preparing abrasive grinding tips according to claim 1, characterized in that: The base material needs to be dried before use, and the drying temperature is 100℃-130℃.

4. The method for preparing abrasive grinding tips according to claim 1, characterized in that: The abrasive is at least one of silicon carbide, alumina, or diamond abrasive.

5. The method for preparing abrasive grinding tips according to claim 1, characterized in that: The lubricant is one or both of polyethylene wax and vinyl bis-stearamide; The coupling agent is one of the following: silane coupling agent, titanate coupling agent, or aluminum-titanium composite series.

6. The method for preparing abrasive grinding tips according to claim 1, characterized in that: In step S01, a toughening agent is also added to the mixture in the twin-screw hopper. The amount of the toughening agent is 4-6 parts by weight, and the toughening agent is a plastic that is the same as the base material system. When the base material is polyester, the toughening agent is a thermoplastic polyester elastomer; when the base material is polyamide, the toughening agent is at least one of nylon elastomer and copolynylon; when the base material is polyolefin, the toughening agent is at least one of polyolefin elastomer and metallocene polyolefin.

7. The method for preparing abrasive grinding tips according to claim 1, characterized in that: In step S02, the shaping temperature is 150-210℃.

8. The method for preparing abrasive grinding tips according to claim 1, characterized in that: The corrosive liquid is either an alkaline corrosive liquid or an acidic corrosive liquid; The alkaline corrosive solution is prepared by mixing food-grade sodium hydroxide and water in a ratio of 35%-40% by mass. The conditions for corrosion treatment with the alkaline corrosive solution are: corrosion treatment temperature of 100-120℃ and corrosion treatment time of 30-60min. The acidic corrosive solution is a 20% sulfuric acid solution; the conditions for corrosion treatment with the acidic corrosive solution are: corrosion treatment temperature 100-120℃, corrosion treatment time 100-120min.

9. An abrasive tip wire is obtained by the preparation method according to any one of claims 1-8.

10. The application of the abrasive tip wire according to claim 9 in the preparation of abrasive brushes.

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