A type of open-pile polishing brush bristles and its preparation method

Abstract

This invention relates to a textured, polishing brush bristle and its preparation method, belonging to the technical field of nylon materials for brush bristles. The textured, polishing brush bristle is made of nylon material. The preparation of the nylon material includes: mixing a silane coupling agent and anhydrous ethanol, adding carbon nanotubes, heating and stirring, purifying, and obtaining pretreated carbon nanotubes; ultrasonically mixing the pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate, adding an initiator, heating and stirring, purifying, and obtaining modified carbon nanotubes; heat-treating ABS, adding nylon resin, modified carbon nanotubes, a compatibilizer, an antioxidant, and a lubricant, and then melt-extruding to obtain the final product. This invention, by adding a compatibilizer and modified carbon nanotubes, contains maleic anhydride, epoxy functional groups, and a styrene phase, which can increase the compatibility between nylon and ABS and improve the interfacial bonding force of carbon nanotubes in the organic system, thereby improving the mechanical properties and processing performance of the material, and enhancing the impact resistance of its composite material.

Description

Technical Field

[0001] This invention belongs to the technical field of nylon materials for brush bristles, and relates to a brush bristle with open-pile and polished texture and its preparation method. Background Art

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

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

[0004] The purpose of this invention is to provide a brush bristle for open-textured polishing and its preparation method. By adding a specific compatibilizer, this invention effectively improves the compatibility between nylon and ABS composite materials, enabling them to bond tightly and avoiding delamination and breakage.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A type of nylon bristle is used in industrial manufacturing and surface treatment. It is mainly used for deburring and polishing metal, woodworking surface finishing, automotive sheet metal repair, electronic component cleaning, jewelry fine polishing, stone and ceramic polishing, etc. By selecting different materials (such as nylon, silicon carbide, steel wire) and abrasive grit size, it can achieve efficient cutting, grinding or mirror finishing of metals, wood, plastics, composite materials, etc. At the same time, the bristle type needs to be adapted according to the material hardness and environmental requirements (such as temperature and rust prevention) to balance precision and efficiency. It is an indispensable surface treatment tool in manufacturing, repair and handicrafts.

[0007] The method for preparing the nylon material includes the following steps:

[0008] 1) After mixing the silane coupling agent and anhydrous ethanol, slowly add the carbon nanotubes, heat and stir, filter to obtain the solid, wash with alcohol, and dry to obtain pretreated carbon nanotubes.

[0009] 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 to react. The solvent was removed by rotary evaporation, and the mixture was washed and dried to obtain modified carbon nanotubes.

[0010] 3) After heat treatment of ABS, nylon resin, modified carbon nanotubes, compatibilizer, antioxidant and lubricant are added and mixed. Then, the mixture is melt-extruded, cooled and pelletized in a twin-screw extruder to obtain the final product.

[0011] As a preferred embodiment of the present invention, the nylon material comprises the following components by weight: 70-80 parts nylon resin, 20-26 parts ABS, 8-10 parts modified carbon nanotubes, 12-15 parts compatibilizer, 0.8-1.4 parts antioxidant, and 0.3-0.8 parts lubricant.

[0012] As a preferred embodiment of the present invention, the nylon resin is any one or a combination of two of nylon 6 and nylon 66; the nylon 66 is EPR-27 with a relative annual content of 2.67, purchased from China Shenma Group; the ABS is XR401 with a powder mass fraction of 14.5%, purchased from LG Chem, 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 a combination 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 Co., Ltd.

[0013] 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. The functional groups of AES resin (acrylonitrile-EPDM rubber-styrene copolymer) mainly include carboxylic anhydride, alkyl, alcohol and maleic anhydride grafted functional groups.

[0014] As a preferred technical solution of the present invention, in step 1), the heating and stirring is carried out at a speed of 300-500 rpm and a temperature of 40-60°C for 4-6 hours; the alcohol washing is carried out by rinsing with anhydrous ethanol four times; and the drying is carried out by drying at 80°C for 10 hours.

[0015] As a preferred embodiment 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; the embodiments and comparative examples of the present invention use vinyltriethoxysilane.

[0016] As a preferred embodiment of the present invention, in step 2), the inert atmosphere is a nitrogen atmosphere; the ultrasonic mixing is performed by ultrasonication at 150-180W power for 20-30 minutes; the heating and stirring reaction is performed by stirring at 60-70℃ and 300-500rpm for 5-6 hours; the cleaning is performed by cleaning twice with deionized water and twice with anhydrous ethanol; and the drying is performed by drying at 90℃ for 8 hours.

[0017] As a preferred embodiment 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.

[0018] In a preferred embodiment of the present invention, the initiator is an azo compound initiator. In the embodiments and comparative examples of the present invention, the initiator used is AIBN.

[0019] As a preferred embodiment of the present invention, in step 3), the heat treatment is performed at 120-132℃ for 24-30 hours; the mixing time is 10-15 minutes; and the melt extrusion temperature is 240-260℃.

[0020] A method for preparing open-pile polishing brush filaments includes the following steps: heating and melting nylon material, extruding it into monofilaments through a mold, stretching the monofilaments at high speed, cutting them, and then processing them through an open-pile process to obtain the brush filaments.

[0021] The beneficial effects of this invention are:

[0022] This invention utilizes compatibilizers and modified carbon nanotubes containing maleic anhydride functional groups, epoxy functional groups, and styrene phases to increase the compatibility between nylon and ABS and improve the interfacial bonding force of carbon nanotubes in organic systems, thereby enhancing the mechanical and processing properties of the materials and improving the impact resistance of the composite materials. Attached Figure Description

[0023] Figure 1 A digital photograph of the open-pile polished brush bristles made of nylon material prepared in Example 1; Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0025] The preparation of a type of open-pile polishing brush bristle includes heating and melting nylon material, extruding it into monofilaments through a mold, stretching the monofilaments at high speed, cutting them, and then processing them into open-pile bristles.

[0026] Example 1

[0027] The nylon material comprises the following components by weight: 70 parts nylon resin, 20 parts ABS, 8 parts modified carbon nanotubes, 12 parts compatibilizer, 0.8 parts antioxidant, and 0.3 parts 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.

[0028] The method for preparing the nylon material includes the following steps:

[0029] 1) After mixing the silane coupling agent and anhydrous ethanol, carbon nanotubes were slowly added and stirred at 300 rpm and 40°C for 4 hours. The solid was filtered, washed four times with anhydrous ethanol, and dried at 80°C for 10 hours to obtain pretreated carbon nanotubes. The mass ratio of the silane coupling agent, anhydrous ethanol, and carbon nanotubes was 4.0:30:12. The silane coupling agent was vinyltriethoxysilane.

[0030] 2) Under a nitrogen atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonicated at 150W for 20 minutes. After adding an initiator and mixing, the mixture was stirred at 60℃ and 300rpm for 5 hours. The solvent was removed by rotary evaporation, and the mixture was washed twice each with deionized water and anhydrous ethanol. Finally, it was dried at 90℃ 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. AIBN was used as the initiator.

[0031] 3) Heat-treat ABS at 120℃ for 24 hours, add nylon resin, modified carbon nanotubes, compatibilizer, antioxidant and lubricant and mix for 10 minutes. Then melt-extrude in a twin-screw extruder at 240℃, cool and pelletize to obtain the final product.

[0032] Example 2

[0033] The nylon material comprises the following components by weight: 73 parts nylon resin, 22 parts ABS, 8.5 parts modified carbon nanotubes, 13 parts compatibilizer, 1 part antioxidant, and 0.5 parts 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.

[0034] The method for preparing the nylon material includes the following steps:

[0035] 1) After mixing the silane coupling agent and anhydrous ethanol, carbon nanotubes were slowly added and stirred at 360 rpm and 47°C for 4.5 h. The solid was filtered, washed four times with anhydrous ethanol, and dried at 80°C for 10 h to obtain pretreated carbon nanotubes. The mass ratio of the silane coupling agent, anhydrous ethanol and carbon nanotubes was 4.5:33:13. The silane coupling agent was vinyltriethoxysilane.

[0036] 2) Under a nitrogen atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonicated at 160W for 25 min. After adding an initiator and mixing, the mixture was stirred at 63℃ and 360rpm for 5.5 h. The solvent was removed by rotary evaporation, and the mixture was washed twice each with deionized water and anhydrous ethanol. Finally, it was dried at 90℃ for 8 h 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.

[0037] 3) After heat-treating ABS at 124℃ for 26 hours, add nylon resin, modified carbon nanotubes, compatibilizer, antioxidant and lubricant and knead for 12 minutes. Then, melt-extrude the mixture in a twin-screw extruder at 245℃, cool and pelletize to obtain the final product.

[0038] Example 3

[0039] The nylon material comprises the following components by weight: 77 parts nylon resin, 24 parts ABS, 9.5 parts modified carbon nanotubes, 14 parts compatibilizer, 1.2 parts antioxidant, and 0.6 parts 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.

[0040] The method for preparing the nylon material includes the following steps:

[0041] 1) After mixing the silane coupling agent and anhydrous ethanol, carbon nanotubes were slowly added and stirred at 430 rpm and 53°C for 5.5 h. The solid was filtered, washed four times with anhydrous ethanol, and dried at 80°C for 10 h to obtain pretreated carbon nanotubes. The mass ratio of the silane coupling agent, anhydrous ethanol and carbon nanotubes was 4.5:37:14. The silane coupling agent was vinyltriethoxysilane.

[0042] 2) Under a nitrogen atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonicated at 170W for 25 min. After adding an initiator and mixing, the mixture was stirred at 67℃ and 430rpm for 5.5 h. The solvent was removed by rotary evaporation, and the mixture was washed twice each with deionized water and anhydrous ethanol. Finally, it was dried at 90℃ for 8 h 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. AIBN was used as the initiator.

[0043] 3) After heat-treating ABS at 128℃ for 28 hours, add nylon resin, modified carbon nanotubes, compatibilizer, antioxidant and lubricant and knead for 13 minutes. Then, melt-extrude the mixture in a twin-screw extruder at 255℃, cool and pelletize to obtain the final product.

[0044] Example 4

[0045] The nylon material comprises the following components by weight: 80 parts nylon resin, 26 parts ABS, 10 parts modified carbon nanotubes, 15 parts compatibilizer, 1.4 parts antioxidant, and 0.8 parts 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.

[0046] The method for preparing the nylon material includes the following steps:

[0047] 1) After mixing the silane coupling agent and anhydrous ethanol, carbon nanotubes were slowly added and stirred at 500 rpm and 60°C for 6 hours. The solid was filtered, washed four times with anhydrous ethanol, and dried at 80°C for 10 hours to obtain pretreated carbon nanotubes. The mass ratio of the silane coupling agent, anhydrous ethanol, and carbon nanotubes was 4.8:40:15. The silane coupling agent was vinyltriethoxysilane.

[0048] 2) Under a nitrogen atmosphere, pretreated carbon nanotubes, ethyl acetate, styrene, and glycidyl methacrylate were ultrasonicated at 180W for 30 min. After adding an initiator and mixing, the mixture was stirred at 70℃ and 500rpm for 6 h. The solvent was removed by rotary evaporation, and the mixture was washed twice each with deionized water and anhydrous ethanol. Finally, it was dried at 90℃ for 8 h 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.

[0049] 3) Heat-treat ABS at 132℃ for 30 hours, add nylon resin, modified carbon nanotubes, compatibilizer, antioxidant and lubricant and knead for 15 minutes, then melt-extrude in a twin-screw extruder at 260℃, cool and pelletize to obtain the final product.

[0050] Comparative Example 1

[0051] Compared with Example 4, Comparative Example 1 differs in that step 1) uses silane coupling agent KH550 instead of vinyltriethoxysilane, while the remaining components, preparation steps and parameters are the same.

[0052] Comparative Example 2

[0053] Compared with Example 4, Comparative Example 2 differs in that step 1) does not use a silane coupling agent, while the remaining components, preparation steps and parameters are the same.

[0054] Comparative Example 3

[0055] Compared with Example 4, Comparative Example 3 differs in that methacrylic acid is used instead of glycidyl methacrylate in step 2), while the remaining components, preparation steps and parameters are the same.

[0056] Comparative Example 4

[0057] Compared with Example 4, Comparative Example 4 differs in that step 2) does not use glycidyl methacrylate, while the remaining components, preparation steps and parameters are the same.

[0058] Comparative Example 5

[0059] Compared with Example 4, Comparative Example 5 differs in that step 3) does not involve heat treatment, while the remaining components, preparation steps, and parameters are the same.

[0060] Comparative Example 6

[0061] Compared with Example 4, Comparative Example 6 differs in that the compatibilizer in step 3) is 10 parts, while the other components, preparation steps and parameters are the same.

[0062] The nylon materials obtained in Examples 1-4 and Comparative Examples 1-6 were tested for the following properties, and the test results are shown in Table 1.

[0063] Tensile property test: In accordance with GB / T1040.2-2006, an electronic universal testing machine was used to conduct tensile tests at a rate of 5 mm / min to test the tensile properties of the specimens.

[0064] Notched impact strength test: according to GB / T1843-2008;

[0065] Table 1

[0066]

[0067] As can be seen from the test results in Table 1, compared with Comparative Examples 1-6, the nylon material prepared by the present invention has excellent tensile strength and notched impact strength, and its mechanical properties are better.

[0068] This invention utilizes a compatibilizer and modified carbon nanotubes. The maleic anhydride and epoxy functional groups within these functional groups react with the amino groups of nylon and the hydroxyl groups of ABS to form amide and ester bonds. This allows the AES-g-MAH and the organic layer on the carbon nanotube surface to act as compatibilizers, significantly improving the compatibility between nylon resin and ABS, and between carbon nanotubes and both ABS and nylon resin. This enhances the mechanical and processing properties of the materials, and improves the impact resistance of the composites. Furthermore, the carbon nanotubes, through a silane coupling agent, introduce carbon-carbon double bonds that can participate in the reaction of styrene and glycidyl methacrylate. The tooling reaction of oil increases the cross-sectional bonding strength between carbon nanotubes and the organic coating layer, increases the grafting rate of styrene and glycidyl methacrylate, and effectively enhances the organic coating effect of carbon nanotubes. The styrene phase is compatible with the styrene phase of ABS and compatibilizer, and increases the interfacial bonding force of carbon nanotubes in the system through physical bonding. The surface of heat-treated ABS 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 glycidyl methacrylate phase, and significantly improve the mechanical strength of nylon composite materials.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A type of open-pile polishing brush bristles, made of nylon material, characterized in that, The method for preparing the nylon material includes the following steps: 1) After mixing the silane coupling agent and anhydrous ethanol, slowly add the carbon nanotubes, heat and stir, filter to obtain the solid, wash with alcohol, and dry to obtain pretreated carbon nanotubes; the silane coupling agent is a vinyl-containing silane coupling agent; 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 to react. The solvent was removed by rotary evaporation, and the mixture was washed and dried to obtain modified carbon nanotubes. 3) After heat treatment of ABS, nylon resin, modified carbon nanotubes, compatibilizer, antioxidant and lubricant are added and mixed. Then, the mixture is melt-extruded, cooled and pelletized in a twin-screw extruder to obtain the final product. The heat treatment is performed at 120-132℃ for 24-30 hours. The nylon material comprises the following components by weight: 70-80 parts nylon resin, 20-26 parts ABS, 8-10 parts modified carbon nanotubes, 12-15 parts compatibilizer, 0.8-1.4 parts antioxidant, and 0.3-0.8 parts lubricant; the compatibilizer is AES-g-MAH.

2. The open-pile polishing brush bristles according to claim 1, characterized in that: The nylon resin is any one or a combination of two of nylon 6 and nylon 66.

3. The open-pile polishing brush bristles according to claim 1, characterized in that: The antioxidant is any one or more combinations of antioxidant 168, antioxidant 1010, antioxidant 1076 and antioxidant 1098; the lubricant is a polysiloxane lubricant.

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

5. The open-pile polishing brush bristles 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.

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

7. The open-pile polishing brush bristles 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.

8. The open-pile polishing brush bristles according to claim 1, characterized in that: In step 3), the mixing time is 10-15 minutes; the melt extrusion temperature is 240-260°C.

9. A method for preparing the open-pile polishing brush bristles as described in any one of claims 1 to 8, characterized in that, The preparation method includes the following steps: heating and melting nylon material, extruding it into monofilaments through a mold, stretching the monofilaments at high speed, cutting them, and then processing them into napplets to obtain the final product.

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