Velvet polishing brush wire and preparation method thereof

Abstract

The invention relates to a fluff polishing brush wire and a preparation method thereof, and belongs to the technical field of nylon materials for brush wires. The napping polishing brush wire is made of a nylon material, and the nylon material is prepared by the following steps: uniformly mixing a silane coupling agent and absolute ethyl alcohol, adding a carbon nano tube, heating, stirring and purifying to obtain a pretreated carbon nano tube; ultrasonically mixing the pretreated carbon nanotube, ethyl acetate, styrene and glycidyl methacrylate, adding an initiator, heating and stirring for reaction, and purifying to obtain a modified carbon nanotube; aBS is subjected to heat treatment, nylon resin, the modified carbon nanotubes, the compatilizer, the antioxidant and the lubricant are added, melt extrusion is performed, and the ABS composite material is prepared. The compatilizer and the modified carbon nanotubes are added, and maleic anhydride, an epoxy functional group and a styrene phase are contained, so that the compatibility of nylon and ABS can be improved, the interface bonding force of the carbon nanotubes in an organic system can be improved, the mechanical property and the processability of the material can be improved, and the impact resistance of the composite material can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of nylon materials for brush filaments and relates to a pile-opening and polishing brush filament and a preparation method thereof. Background Art

[0002] Nylon PA6 and PA66, two general-purpose plastics, are widely produced and used due to their exceptional performance. PA6 and PA66 copolymers exhibit low melting points, excellent toughness, low water absorption, and good aging resistance. ABS resin, a copolymer of acrylonitrile-butadiene-styrene, is also a high-performance material, offering heat resistance, excellent surface gloss, and dimensional stability after processing.

[0003] The application of nylon PA and ABS composite materials in open-pile grinding brush wires achieves material optimization through complementary performance. Nylon provides wear resistance and high temperature resistance, while ABS enhances rigidity and reduces costs. However, the compatibility between the two is poor, and problems such as delamination and breakage are prone to occur during processing. Summary of the Invention

[0004] The purpose of the present invention is to provide a velvet polishing brush filament and a preparation method thereof. The present invention effectively improves the compatibility between nylon and ABS composite materials by adding a specific compatibilizer, so that the two can be tightly combined, avoiding the occurrence of delamination and breakage.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A velvet grinding brush wire is made of nylon material. The velvet grinding brush wire is widely used in industrial manufacturing and surface treatment fields. It is mainly used for metal deburring and polishing, woodworking surface finishing, automobile sheet metal repair, electronic component cleaning, jewelry fine grinding, stone and ceramic polishing and other scenarios. Through the selection of different materials (such as nylon, silicon carbide, steel wire) and abrasive particle size, efficient cutting, grinding or mirror treatment of metal, wood, plastic, composite materials, etc. can be achieved. At the same time, the brush wire type needs to be adapted according to the hardness of the material and environmental requirements (such as temperature and rust prevention), taking into account both precision and efficiency. It is an indispensable surface treatment tool in manufacturing, maintenance and handicrafts.

[0006] The preparation method of the nylon material comprises the following steps: 1) After mixing the silane coupling agent and anhydrous ethanol, slowly add the carbon nanotubes and heat and stir. Filter the solid, wash it with alcohol, and dry it to obtain pretreated carbon nanotubes. 2) Under an inert atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonically mixed, an initiator was added, and the mixture was heated and stirred for reaction. The solvent was removed by rotary evaporation, and the mixture was washed and dried to obtain modified carbon nanotubes; 3) After heat-treating the ABS, nylon resin, modified carbon nanotubes, a compatibilizer, an antioxidant, and a lubricant are added and kneaded, and then melt-extruded in a twin-screw extruder, cooled, and pelletized to obtain the product.

[0007] As a preferred technical solution of the present invention, the nylon material includes the following components by weight: 70-80 parts of nylon resin, 20-26 parts of ABS, 8-10 parts of modified carbon nanotubes, 12-15 parts of compatibilizer, 0.8-1.4 parts of antioxidant, and 0.3-0.8 parts of lubricant.

[0008] As a preferred technical solution of the present invention, the nylon resin is any one or a combination of nylon 6 and nylon 66; the model of the nylon 66 is EPR-27, with a relative annual weight of 2.67, purchased from China Shenma Group; the model of the ABS is XR401, with a rubber powder mass fraction of 14.5%, purchased from LG Chemical in South Korea; the compatibilizer is AES-g-MAH, with a maleic anhydride grafting rate of 1.2%, purchased from Jiayirong Polymer Shanghai Co., Ltd.; the antioxidant is any one or more combinations of antioxidant 168, antioxidant 1010, antioxidant 1076 and antioxidant 1098; the lubricant is a polysiloxane lubricant, and the antioxidant and lubricant are purchased from Dongguan Shengbang Polymer Materials.

[0009] As a preferred technical solution of the present invention, the maleic anhydride grafting rate of the AES-g-MAH compatibilizer is 1.2%. AES-g-MAH is a maleic anhydride grafted polymer with AES resin as the matrix material, wherein the functional groups of the AES resin (acrylonitrile-EPDM rubber-styrene copolymer) mainly include carboxylic anhydride, alkyl, alcohol and maleic anhydride grafted functional groups.

[0010] As a preferred technical solution of the present invention, in step 1), the heating and stirring is stirring at 300-500 rpm at 40-60°C for 4-6 hours; the washing with alcohol is rinsing with anhydrous ethanol four times; and the drying is drying at 80°C for 10 hours.

[0011] As a preferred technical solution of the present invention, in step 1), the mass ratio of the silane coupling agent, anhydrous ethanol and carbon nanotubes is 4.0-4.8:30-40:12-15; the silane coupling agent is a vinyl-containing silane coupling agent; vinyltriethoxysilane is used in the examples and comparative examples of the present invention.

[0012] As a preferred technical solution of the present invention, in step 2), the inert atmosphere is a nitrogen atmosphere; the ultrasonic mixing is performed at a power of 150-180 W for 20-30 min; the heating and stirring reaction is performed at 60-70° C. and 300-500 rpm for 5-6 h; the washing is performed twice with deionized water and twice with anhydrous ethanol; and the drying is performed at 90° C. for 8 h.

[0013] As a preferred technical solution of the present invention, in step 2), the mass ratio of the pretreated carbon nanotubes, ethyl acetate, styrene, glycidyl methacrylate and initiator is 22-28:80-100:3.5-4.0:2.5-2.8:0.08-0.10.

[0014] As a preferred technical solution of the present invention, the initiator is an azo compound initiator. In the examples and comparative examples of the present invention, the initiator is AIBN.

[0015] As a preferred technical solution of the present invention, in step 3), the heat treatment is performed at 120-132°C for 24-30 hours; the banburying time is 10-15 minutes; and the melt extrusion temperature is 240-260°C.

[0016] A method for preparing a velvet-opened polishing brush comprises the following steps: heating and melting a nylon material, extruding the nylon material into a monofilament through a die, stretching the monofilament at a high speed, cutting the monofilament, and performing a velvet-opening treatment to obtain the brush.

[0017] Beneficial effects of the present invention: The present invention increases the compatibility between nylon and ABS and improves the interfacial bonding force of carbon nanotubes in an organic system by adding a compatibilizer and modifying carbon nanotubes, thereby improving the mechanical properties and processing properties of the material and the impact resistance of the composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a digital photo of the velvet polishing brush made of nylon material obtained in Example 1; DETAILED DESCRIPTION In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0019] The preparation of a pile-opening polishing brush filament comprises the following steps: heating and melting a nylon material, extruding the nylon material into a monofilament through a die, stretching the monofilament at a high speed, cutting the monofilament, and performing a pile-opening treatment to obtain the brush filament.

[0020] Example 1 The nylon material includes the following components in parts by weight: 70 parts of nylon resin, 20 parts of ABS, 8 parts of modified carbon nanotubes, 12 parts of a compatibilizer, 0.8 parts of an antioxidant, and 0.3 parts of a lubricant; wherein the nylon resin is nylon 66; the compatibilizer is AES-g-MAH; the antioxidant is composed of antioxidant 168 and antioxidant 1010 in a mass ratio of 1:2; and the lubricant is a polysiloxane lubricant.

[0021] The preparation method of the nylon material comprises the following steps: 1) After mixing a silane coupling agent and anhydrous ethanol, slowly adding carbon nanotubes, stirring at 300 rpm and 40°C for 4 hours, filtering the solid, rinsing it four times with anhydrous ethanol, and drying it at 80°C for 10 hours to obtain pretreated carbon nanotubes; the mass ratio of the silane coupling agent, anhydrous ethanol, and carbon nanotubes is 4.0:30:12; the silane coupling agent is vinyltriethoxysilane; 2) Under a nitrogen atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonically treated at 150 W power for 20 minutes, an initiator was added and mixed, and then stirred at 60°C and 300 rpm for 5 hours. The solvent was removed by rotary evaporation, and the mixture was washed twice with deionized water and anhydrous ethanol, and then dried at 90°C for 8 hours to obtain modified carbon nanotubes; the mass ratio of the pretreated carbon nanotubes, ethyl acetate, styrene, glycidyl methacrylate, and initiator was 22:80:3.5:2.5:0.08; the initiator used was AIBN; 3) ABS is heat-treated at 120°C for 24 hours, nylon resin, modified carbon nanotubes, a compatibilizer, an antioxidant, and a lubricant are added and kneaded for 10 minutes, and then melt-extruded at 240°C in a twin-screw extruder, cooled, and pelletized to obtain the product.

[0022] Example 2 The nylon material includes the following components in parts by weight: 73 parts of nylon resin, 22 parts of ABS, 8.5 parts of modified carbon nanotubes, 13 parts of a compatibilizer, 1 part of an antioxidant, and 0.5 parts of a lubricant; wherein the nylon resin is nylon 66; the compatibilizer is AES-g-MAH; the antioxidant is composed of antioxidant 168 and antioxidant 1010 in a mass ratio of 1:2; and the lubricant is a polysiloxane lubricant.

[0023] The preparation method of the nylon material comprises the following steps: 1) After uniformly mixing a silane coupling agent and anhydrous ethanol, slowly adding carbon nanotubes, stirring at 360 rpm and 47°C for 4.5 hours, filtering the solid, rinsing it four times with anhydrous ethanol, and drying it at 80°C for 10 hours to obtain pretreated carbon nanotubes; the mass ratio of the silane coupling agent, anhydrous ethanol, and carbon nanotubes is 4.5:33:13; the silane coupling agent is vinyltriethoxysilane; 2) Under a nitrogen atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonically treated at 160 W power for 25 minutes, an initiator was added and mixed, and then stirred at 63°C and 360 rpm for 5.5 hours. The solvent was removed by rotary evaporation, and the mixture was washed twice with deionized water and anhydrous ethanol, and then dried at 90°C for 8 hours to obtain modified carbon nanotubes; the mass ratio of the pretreated carbon nanotubes, ethyl acetate, styrene, glycidyl methacrylate, and initiator was 24:85:3.5:2.6:0.085; the initiator used was AIBN; 3) ABS was heat-treated at 124°C for 26 hours, and nylon resin, modified carbon nanotubes, a compatibilizer, an antioxidant, and a lubricant were added and kneaded for 12 minutes. The ABS was then melt-extruded at 245°C in a twin-screw extruder, cooled, and pelletized to obtain the product.

[0024] Example 3 The nylon material includes the following components in parts by weight: 77 parts of nylon resin, 24 parts of ABS, 9.5 parts of modified carbon nanotubes, 14 parts of a compatibilizer, 1.2 parts of an antioxidant, and 0.6 parts of a lubricant; wherein the nylon resin is nylon 66; the compatibilizer is AES-g-MAH; the antioxidant is composed of antioxidant 168 and antioxidant 1010 in a mass ratio of 1:2; and the lubricant is a polysiloxane lubricant.

[0025] The preparation method of the nylon material comprises the following steps: 1) After mixing the silane coupling agent and anhydrous ethanol, slowly adding the carbon nanotubes, stirring at 430 rpm and 53°C for 5.5 hours, filtering the solid, rinsing it four times with anhydrous ethanol, and drying it at 80°C for 10 hours to obtain pretreated carbon nanotubes; the mass ratio of the silane coupling agent, anhydrous ethanol, and carbon nanotubes is 4.5:37:14; the silane coupling agent is vinyltriethoxysilane; 2) Under a nitrogen atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonically treated at 170 W power for 25 minutes, an initiator was added and mixed, and then stirred at 67°C and 430 rpm for 5.5 hours. The solvent was removed by rotary evaporation, and the mixture was washed twice with deionized water and anhydrous ethanol, and then dried at 90°C for 8 hours to obtain modified carbon nanotubes; the mass ratio of the pretreated carbon nanotubes, ethyl acetate, styrene, glycidyl methacrylate, and initiator was 26:93:3.8:2.7:0.095; the initiator used was AIBN; 3) ABS was heat-treated at 128°C for 28 hours, and nylon resin, modified carbon nanotubes, a compatibilizer, an antioxidant, and a lubricant were added and kneaded for 13 minutes. The ABS was then melt-extruded at 255°C in a twin-screw extruder, cooled, and pelletized to obtain the product.

[0026] Example 4 The nylon material includes the following components in parts by weight: 80 parts of nylon resin, 26 parts of ABS, 10 parts of modified carbon nanotubes, 15 parts of a compatibilizer, 1.4 parts of an antioxidant, and 0.8 parts of a lubricant; wherein the nylon resin is nylon 66; the compatibilizer is AES-g-MAH; the antioxidant is composed of antioxidant 168 and antioxidant 1010 in a mass ratio of 1:2; and the lubricant is a polysiloxane lubricant.

[0027] The preparation method of the nylon material comprises the following steps: 1) After mixing a silane coupling agent and anhydrous ethanol, slowly adding carbon nanotubes, stirring at 500 rpm and 60°C for 6 hours, filtering the solid, rinsing it four times with anhydrous ethanol, and drying it at 80°C for 10 hours to obtain pretreated carbon nanotubes; the mass ratio of the silane coupling agent, anhydrous ethanol, and carbon nanotubes is 4.8:40:15; the silane coupling agent is vinyltriethoxysilane; 2) Under a nitrogen atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonically treated at 180 W power for 30 minutes, an initiator was added and mixed, and then stirred at 70°C and 500 rpm for 6 hours. The solvent was removed by rotary evaporation, and the mixture was washed twice with deionized water and anhydrous ethanol, and then dried at 90°C for 8 hours to obtain modified carbon nanotubes; the mass ratio of the pretreated carbon nanotubes, ethyl acetate, styrene, glycidyl methacrylate, and initiator was 28:100:4.0:2.8:0.10; the initiator used was AIBN; 3) ABS was heat-treated at 132°C for 30 hours, nylon resin, modified carbon nanotubes, compatibilizer, antioxidant and lubricant were added and kneaded for 15 minutes, and then melt-extruded at 260°C in a twin-screw extruder, cooled and pelletized to obtain the product.

[0028] Comparative Example 1 Compared with Example 4, Comparative Example 1 is different in that, in step 1), silane coupling agent KH550 is used instead of vinyltriethoxysilane, and the other components, preparation steps and parameters are the same.

[0029] Comparative Example 2 Compared with Example 4, Comparative Example 2 is different in that no silane coupling agent is used in step 1), and the remaining components, preparation steps and parameters are the same.

[0030] Comparative Example 3 Compared with Example 4, Comparative Example 3 is different in that methacrylic acid is used instead of glycidyl methacrylate in step 2), and the other components, preparation steps and parameters are the same.

[0031] Comparative Example 4 Compared with Example 4, Comparative Example 4 is different in that glycidyl methacrylate is not used in step 2), and the other components, preparation steps and parameters are the same.

[0032] Comparative Example 5 Compared with Example 4, Comparative Example 5 is different in that step 3) does not involve heat treatment, and the remaining components, preparation steps and parameters are the same.

[0033] Comparative Example 6 Compared with Example 4, Comparative Example 6 is different in that 10 parts of the compatibilizer are used in step 3), and the other components, preparation steps and parameters are the same.

[0034] The nylon materials prepared in Examples 1-4 and Comparative Examples 1-6 were subjected to the following performance tests, and the test results are shown in Table 1.

[0035] Tensile performance test: According to GB / T1040.2-2006, an electronic universal testing machine is used to perform a tensile test at a rate of 5 mm / min to test the tensile performance of the specimen; Notched impact strength test: according to GB / T1843-2008; Table 1

[0036] From the test results in Table 1, it can be seen that compared with Comparative Examples 1-6, the nylon materials prepared in Examples 1-4 of the present invention have excellent tensile strength and notched impact strength, and their mechanical properties are better.

[0037] The present invention adds a compatibilizer and modified carbon nanotubes, wherein the maleic anhydride functional group and epoxy functional group contained in the compatibilizer can react with the amino group of nylon and the hydroxyl group of ABS to form an amide bond and an ester bond, so that the organic layer on the surface of the AES-g-MAH and carbon nanotubes can act as a compatibilizer, significantly improving the compatibility between nylon resin and ABS, and between carbon nanotubes and ABS and nylon resin, thereby improving the mechanical properties and processing properties of the material and improving the impact resistance of the composite material. In addition, the carbon nanotubes are introduced with a silane coupling agent to form a carbon-carbon double bond that can participate in the reaction between styrene and methacrylic acid glycidyl. The tool reaction of oil increases the cross-sectional bonding strength between carbon nanotubes and the organic coating layer, increases the grafting rate of styrene and methacrylate glycidol, and effectively increases the organic coating effect on carbon nanotubes. The styrene phase is compatible with ABS and the styrene phase of the compatibilizer, and the interfacial bonding force of carbon nanotubes in the system is increased through physical bonding. The surface of ABS after heat treatment can obtain more active hydroxyl groups, which can significantly increase the bonding rate between the maleic anhydride group of the compatibilizer and the epoxy group in the methacrylate glycidol phase, significantly improving the mechanical strength of the nylon composite material.

[0038] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any indirect modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A velvet polishing brush made of nylon material, characterized in that: The preparation method of the nylon material comprises the following steps: 1) After mixing the silane coupling agent and anhydrous ethanol, slowly add the carbon nanotubes and heat and stir. Filter the solid, wash it with alcohol, and dry it to obtain pretreated carbon nanotubes. 2) Under an inert atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonically mixed, an initiator was added, and the mixture was heated and stirred for reaction. The solvent was removed by rotary evaporation, and the mixture was washed and dried to obtain modified carbon nanotubes; 3) After heat-treating the ABS, nylon resin, modified carbon nanotubes, a compatibilizer, an antioxidant, and a lubricant are added and kneaded, and then melt-extruded in a twin-screw extruder, cooled, and pelletized to obtain the product.

2. The open-pile polishing brush according to claim 1, characterized in that: The nylon material comprises the following components in parts by weight: 70-80 parts of nylon resin, 20-26 parts of ABS, 8-10 parts of modified carbon nanotubes, 12-15 parts of compatibilizer, 0.8-1.4 parts of antioxidant, and 0.3-0.8 parts of lubricant.

3. A velvet polishing brush according to claim 1 or 2, characterized in that: The nylon resin is any one of nylon 6 and nylon 66 or a combination of the two; and the compatibilizer is AES-g-MAH.

4. A velvet polishing brush according to claim 1 or 2, characterized in that: The antioxidant is any one or more combinations of antioxidant 168, antioxidant 1010, antioxidant 1076 and antioxidant 1098; and the lubricant is a polysiloxane lubricant.

5. The open-pile polishing brush according to claim 1, characterized in that: In step 1), the heating and stirring is stirring at 300-500 rpm at 40-60° C. for 4-6 hours; the washing with alcohol is rinsing with anhydrous ethanol four times; and the drying is drying at 80° C. for 10 hours.

6. The open-pile polishing brush according to claim 1, characterized in that: In step 1), the mass ratio of the silane coupling agent, anhydrous ethanol and carbon nanotubes is 4.0-4.8:30-40:12-15; the silane coupling agent is a vinyl-containing silane coupling agent.

7. The open-pile polishing brush according to claim 1, characterized in that: In step 2), the inert atmosphere is a nitrogen atmosphere; the ultrasonic mixing is performed at a power of 150-180 W for 20-30 minutes; the heating and stirring reaction is performed at 60-70° C. and 300-500 rpm for 5-6 hours; the washing is performed twice with deionized water and twice with anhydrous ethanol; and the drying is performed at 90° C. for 8 hours.

8. The open-pile polishing brush according to claim 1, characterized in that: In step 2), the mass ratio of the pretreated carbon nanotubes, ethyl acetate, styrene, glycidyl methacrylate and initiator is 22-28:80-100:3.5-4.0:2.5-2.8:0.08-0.

10.

9. The open-pile polishing brush according to claim 1, characterized in that: In step 3), the heat treatment is performed at 120-132° C. for 24-30 hours; the banburying time is 10-15 minutes; and the temperature of the melt extrusion is 240-260° C.

10. A method for preparing a pile-opening and polishing brush according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: heating and melting the nylon material, extruding the nylon material into monofilaments through a die, stretching the monofilaments at high speed, cutting the monofilaments, and performing a velvet opening treatment to obtain the monofilaments.

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