A method for preparing a high wear-resistant and antistatic nylon material

Abstract

This invention relates to the field of nylon material technology, and provides a method for preparing a high-wear-resistant and antistatic nylon material. Carbon nanotubes are used as a carrier, utilizing their high conductivity and high oil absorption properties to adsorb a low-friction coefficient wear-resistant material onto the carbon nanotubes. The treated carbon nanotubes are then added to the nylon material to obtain a high-wear-resistant and antistatic nylon composite material. The carbon nanotube-silicone oil adsorption treatment solves the problem of conductive filler agglomeration. Simultaneously, the silicone oil forms a dual lubrication system with PTFE / MoS₂, achieving a synergistic improvement in both antistatic properties and high wear resistance.

Description

Technical Field

[0001] This invention relates to the field of nylon material technology, and in particular to a method for preparing a high wear-resistant and antistatic nylon material. Background Technology

[0002] Nylon itself has excellent wear resistance and is widely used in wear-resistant parts. However, for long-term moving parts, especially those in contact with metal materials, such as textile machinery, robotic arms, and rotating structures, the wear resistance of pure nylon cannot meet the application requirements.

[0003] Current conventional modification methods involve adding silicone oil, silicone, graphite, molybdenum disulfide, polytetrafluoroethylene, etc., to nylon resin to reduce the interfacial friction coefficient and improve the material's wear resistance. However, the addition of these additives also reduces the material's mechanical properties. Furthermore, during long-term use, due to the material's inherent insulation, static electricity easily accumulates on the surface, attracting impurities and particulate matter from the air. These particles increase the roughness of the friction interface, thus raising the friction coefficient and ultimately further reducing the material's lifespan. Therefore, addressing these issues is crucial. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a method for preparing a highly wear-resistant and antistatic nylon material, thereby solving the problems in the background art.

[0005] To achieve the above objectives, the present invention provides a method for preparing a high wear-resistant and antistatic nylon material, comprising the following steps: Step 1: Select carbon nanotubes and ball mill them to reduce their length to below 500 nm. Step 2: Place the carbon nanotubes in a high-speed mixer and stir at a low speed of 50 r / min. Heat the silicone oil to 60°C and add it in the form of a spray from the liquid feed port of the mixer. After the addition is complete, stir at a high speed of 300 r / min for 20 minutes to obtain the carbon nanotube silicone oil adsorbent. Step 3: Seal the pretreated carbon nanotubes and let them stand until needed. Step 4: Add nylon material to the high-speed mixer, then add the carbon nanotubes treated in Step 3 and mix for 10 minutes. Step 5: The mixed blend is extruded through a twin-screw extruder, and then cooled, pelletized, and dried.

[0006] Preferably, the mass ratio of the nanotubes in step one to the silicone oil added in step two is 1:1 or 1:2.

[0007] Preferably, in step four, a heat stabilizer is added and stirred. The heat stabilizer is a mixture of antioxidant 1098 and antioxidant 168 in a ratio of 1:1.

[0008] Preferably, in step four, an auxiliary wear-resistant agent is added and stirred. The auxiliary wear-resistant agent is one of polytetrafluoroethylene or molybdenum disulfide.

[0009] Preferably, the nylon material comprises 25-50 parts by weight, carbon nanotubes 1-2 parts by weight, silicone oil 1-4 parts by weight, heat stabilizer 0.2-1.0 parts by weight, and auxiliary wear-resistant agent 1-5 parts by weight.

[0010] Preferably, the silicone oil is methyl silicone oil with a kinematic viscosity of 500-1000 mm² / s.

[0011] Preferably, the nylon material is one or more of PA6, PA66, PA610, PA612, PA1010, PA1212, PA46, and PAMAXD6.

[0012] Preferably, the temperature range of the twin-screw extruder in step five is: zone one 230-240℃, zone two 250-260℃, zone three 260-270℃, zone four 255-265℃, and die head 250-255℃, with a screw speed of 300-400 r / min.

[0013] The beneficial effects of this invention are as follows: This invention exhibits excellent functional synergy. Using carbon nanotubes as a carrier, and leveraging their high conductivity and high oil absorption properties, a low-friction coefficient wear-resistant material is adsorbed onto the carbon nanotubes. The treated carbon nanotubes are then added to nylon material, resulting in a highly wear-resistant and antistatic nylon composite material. The carbon nanotube-silicone oil adsorption treatment solves the problem of conductive filler agglomeration. Simultaneously, the silicone oil and PTFE / MoS2 form a dual lubrication system, achieving a synergistic improvement in both antistatic properties and high wear resistance. Stable mechanical and thermal properties: Optimized raw material ratio and processing technology avoid damage to the nylon matrix properties by functional fillers. Tensile strength ≥82MPa, impact strength ≥11kJ / m², heat distortion temperature ≥201℃, meeting the structural strength requirements of industrial applications. The processing technology is simple and controllable: it adopts a conventional twin-screw extruder, the process parameters are clear, the raw materials are readily available, it is suitable for large-scale industrial production, and reduces production costs. It has a wide range of applications: it can be used in electronic device housings, mechanical gears, automotive bearings and other components that require both electrostatic protection and wear resistance, and has a broad market prospect. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0015] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. Example 1

[0016] Take 1 kg of ball-milled carbon nanotubes and stir at a low speed of 50 r / min. Heat 1 kg of silicone oil to 60℃ and add it in the form of a spray from the liquid feed port of the mixer. After the addition is complete, stir at a high speed of 300 r / min for 20 min to obtain 2 kg of carbon nanotube silicone oil adsorbent. Select 50 kg of nylon material PA66 raw material, add 2 kg of carbon nanotube silicone oil adsorbent, 100 g of antioxidant 1098, and 200 g of antioxidant 168, and mix with a high-speed mixer for 10 min. After mixing, the blend is extruded through a twin-screw extruder, cooled, pelletized, dried, and then used to prepare standard test strips to test mechanical properties, surface resistivity, coefficient of friction, and mass wear. Example 2

[0017] Take 1 kg of ball-milled carbon nanotubes and stir at a low speed of 50 r / min. Heat 2 kg of silicone oil to 60℃ and add it in the form of a spray from the liquid feed port of the mixer. After the addition is complete, stir at a high speed of 300 r / min for 20 min to obtain 3 kg of carbon nanotube silicone oil adsorbent. Select 50 kg of nylon material PA66 raw material, add 3 kg of carbon nanotube silicone oil adsorbent, 100 g of antioxidant 1098, and 200 g of antioxidant 168, and mix with a high-speed mixer for 10 min. After mixing, the blend is extruded through a twin-screw extruder, cooled, pelletized, dried, and then used to prepare standard test strips for testing mechanical properties, surface resistivity, coefficient of friction, and mass wear. Example 3

[0018] Take 1 kg of ball-milled carbon nanotubes and stir at a low speed of 50 r / min. Heat 1 kg of silicone oil to 60℃ and add it in the form of a spray from the liquid feed port of the mixer. After the addition is complete, stir at a high speed of 300 r / min for 20 min to obtain 3 kg of carbon nanotube silicone oil adsorbent. Select 25 kg of nylon material PA66 raw material, add 2 kg of carbon nanotube silicone oil adsorbent, 100 g of antioxidant 1098, and 200 g of antioxidant 168, and mix with a high-speed mixer for 10 min. After mixing, the blend is extruded through a twin-screw extruder, cooled, pelletized, dried, and then used to prepare standard test strips to test mechanical properties, surface resistivity, coefficient of friction, and mass wear. Example 4

[0019] Take 1 kg of ball-milled carbon nanotubes, stir at a low speed of 50 r / min, heat 1 kg of silicone oil to 60℃, and add it in the form of spray from the liquid feed port of the mixer. After the addition is complete, stir at a high speed of 300 r / min for 20 min to obtain 2 kg of carbon nanotube silicone oil adsorbent. Select 50 kg of nylon material PA66 raw material, add 2 kg of carbon nanotube silicone oil adsorbent, 5 kg of polytetrafluoroethylene, 100 g of antioxidant 1098, and 200 g of antioxidant 168, mix in a high-speed mixer for 10 min, and then extrude the mixture through a twin-screw extruder. After cooling, pelletizing, and drying, prepare standard test strips to test mechanical properties, surface resistivity, coefficient of friction, and mass wear. Example 5

[0020] Take 1 kg of ball-milled carbon nanotubes, stir at a low speed of 50 r / min, heat 1 kg of silicone oil to 60℃, and add it in the form of spray from the liquid feed port of the mixer. After the addition is complete, stir at a high speed of 300 r / min for 20 min to obtain 2 kg of carbon nanotube silicone oil adsorbent. Select 50 kg of nylon material PA66 raw material, add 2 kg of carbon nanotube silicone oil adsorbent, 1 kg of molybdenum disulfide, 100 g of antioxidant 1098, and 200 g of antioxidant 168, mix in a high-speed mixer for 10 min, and then extrude the mixture through a twin-screw extruder. After cooling, pelletizing, and drying, prepare standard test strips to test mechanical properties, surface resistivity, coefficient of friction, and mass wear.

[0021] The test properties of the nylon materials prepared in Examples 1-5 are shown in the table below. The results show that carbon nanotubes, with their specific aspect ratio, are beneficial for maintaining mechanical properties. Furthermore, the addition of carbon nanotubes significantly reduces the surface resistivity of the material, meeting antistatic requirements. In particular, Example 3 shows a surface resistivity of 10⁶, approaching conductivity levels, which greatly prevents increased wear caused by electrostatic adsorption of dust during use. Additionally, the silicone oil adsorbed by the carbon nanotubes significantly reduces the material's coefficient of friction and mass wear. Since the silicone oil is adsorbed within the carbon nanotubes, it is more time-efficient and hygienic than applying additional oil during use.

[0022] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and many other variations of different aspects of the invention as described above exist, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for preparing a high wear-resistant and antistatic nylon material, characterized in that, It includes the following steps: Step 1: Select carbon nanotubes and ball mill them to reduce their length to below 500 nm. Step 2: Place the carbon nanotubes in a high-speed mixer and stir at a low speed of 50 r / min. Heat the silicone oil to 60°C and add it in the form of a spray from the liquid feed port of the mixer. After the addition is complete, stir at a high speed of 300 r / min for 20 minutes to obtain the carbon nanotube silicone oil adsorbent. Step 3: Seal the pretreated carbon nanotubes and let them stand until needed. Step 4: Add nylon material to the high-speed mixer, then add the carbon nanotubes treated in step 3 and mix for 10 minutes. Step 5: The mixed blend is extruded through a twin-screw extruder, and then cooled, pelletized, and dried.

2. The method for preparing a high wear-resistant and antistatic nylon material according to claim 1, characterized in that, The mass ratio of the nanotubes in step one to the silicone oil added in step two is 1:1 or 1:

2.

3. The method for preparing a high wear-resistant and antistatic nylon material according to claim 2, characterized in that, In step four, a heat stabilizer is added and stirred. The heat stabilizer is a mixture of antioxidant 1098 and antioxidant 168 in a ratio of 1:

1.

4. The method for preparing a high wear-resistant and antistatic nylon material according to claim 3, characterized in that, In step four, an auxiliary wear-resistant agent is added and stirred. The auxiliary wear-resistant agent is either polytetrafluoroethylene or molybdenum disulfide.

5. The method for preparing a high wear-resistant and antistatic nylon material according to claim 4, characterized in that, The nylon material comprises 25-50 parts by weight, carbon nanotubes 1-2 parts, silicone oil 1-4 parts, heat stabilizer 0.2-1.0 parts, and auxiliary wear-resistant agent 1-5 parts.

6. The method for preparing a high wear-resistant and antistatic nylon material according to claim 1, characterized in that, The silicone oil is methyl silicone oil with a kinematic viscosity of 500-1000 mm. 2 / s.

7. The method for preparing a high wear-resistant and antistatic nylon material according to claim 1, characterized in that, The nylon material is one or more of PA6, PA66, PA610, PA612, PA1010, PA1212, PA46, and PAMAXD6.

8. The method for preparing a high wear-resistant and antistatic nylon material according to claim 1, characterized in that, The temperature range of the twin-screw extruder in step five is as follows: Zone 1 230-240℃, Zone 2 250-260℃, Zone 3 260-270℃, Zone 4 255-265℃, and the die head 250-255℃, with a screw speed of 300-400 r / min.

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