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CN-122011752-A - Nylon 6 composite material and preparation method thereof

CN122011752ACN 122011752 ACN122011752 ACN 122011752ACN-122011752-A

Abstract

The invention relates to a high polymer material modification technology, in particular to a nylon 6 composite material and a preparation method thereof, wherein the nylon 6 composite material comprises, by mass, 60-75 parts of nylon 6, 8-15 parts of lamellar potassium titanate whiskers, 5-12 parts of glass fibers and/or carbon fibers, 1-3 parts of molybdenum disulfide, 2-4 parts of nano montmorillonite, 4-5 parts of coupling agents, 3-5 parts of crosslinking compatilizers, 1-2 parts of adhesion promoters and 0.5-1.5 parts of antioxidants. According to the invention, the nylon 6 composite material with high friction and high viscosity is successfully prepared through the synergistic design of the lamellar potassium titanate whisker and the fibrous filler and the precise regulation and control of the tackifier.

Inventors

  • LI WANGJIA
  • MA YUANHAO
  • XIE YANG
  • SU JUNJIE
  • LAN FUYING

Assignees

  • 江西固康新材料有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. The nylon 6 composite material is characterized by comprising nylon 6, lamellar potassium titanate whisker, glass fiber and/or carbon fiber, molybdenum disulfide, nano montmorillonite, a coupling agent, a crosslinking compatilizer, a tackifier and an antioxidant.
  2. 2. The nylon 6 composite of claim 1, wherein the raw materials comprise the following components in parts by weight: 60-75 parts of nylon 6; 8-15 parts of lamellar potassium titanate whisker; 5-12 parts of glass fiber and/or carbon fiber; 1-3 parts of molybdenum disulfide; 2-4 parts of nano montmorillonite; 4-5 parts of coupling agent; 3-5 parts of cross-linking compatilizer; 1-2 parts of tackifier; 0.5-1.5 parts of antioxidant.
  3. 3. The nylon 6 composite of claim 1 wherein: The relative viscosity of the nylon 6 is 2.2-3.8, and the nylon 6 is a mixture of low-viscosity nylon 6 with the relative viscosity of 2.4, medium-viscosity nylon 6 with the relative viscosity of 2.8 and high-viscosity nylon 6 with the relative viscosity of 3.4; The mass part ratio of the low-viscosity nylon 6 to the medium-viscosity nylon 6 to the high-viscosity nylon 6 is 20-30:15-20:15-20; The diameter-thickness ratio of the lamellar potassium titanate whisker is 15-25:1, and the lamellar diameter is 5-10 mu m; The glass fiber is alkali-free chopped glass fiber with the length of 3-5mm; The carbon fiber is PAN-based chopped carbon fiber with the length of 2-4mm; The coupling agent is KH560.
  4. 4. The nylon 6 composite of claim 1 wherein: the crosslinking compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted ethylene-octene copolymer; The tackifier is hydrogenated petroleum resin or terpene resin; the antioxidant is prepared by compounding an antioxidant 1076 and an antioxidant 168 according to a mass ratio of 2:1.
  5. 5. A method of making a nylon 6 composite according to any one of claims 1-4, comprising the steps of: S1, mixing a coupling agent with absolute ethyl alcohol, then adding lamellar potassium titanate whisker, molybdenum disulfide and nano montmorillonite, mixing, heating and stirring until an object appears to be milky, adding part of a crosslinking compatilizer and all of a tackifier, and continuing stirring to obtain a pre-dispersion functional filler pre-material; S2, drying the nylon 6, the glass fiber and/or the carbon fiber, and controlling the water content to be less than or equal to 0.1% to obtain the dried nylon 6, the dried glass fiber and/or the carbon fiber; s3, mixing and stirring the dry nylon 6, the pre-dispersed functional filler pre-material, the antioxidant and the rest crosslinking compatilizer to obtain a pretreatment material; S4, adding the pretreatment material, the dry glass fiber and/or the carbon fiber into a double-screw extruder, and carrying out melt blending to obtain a blended melt; and S5, extruding, water-cooling and granulating the blending melt to obtain the nylon 6 composite material.
  6. 6. The method for preparing a nylon 6 composite material according to claim 5, wherein in S1: Mixing the coupling agent and the absolute ethyl alcohol according to the mass ratio of 1:3, stirring and mixing, and then standing for 2-3 hours; the partial crosslinking compatilizer accounts for 20-30% of the total mass of the crosslinking compatilizer; the mixing of the coupling agent, the absolute ethyl alcohol, the lamellar potassium titanate whisker, the molybdenum disulfide, the nano montmorillonite, the crosslinking compatilizer and the tackifier is carried out in a high-speed mixer, the heating and stirring temperature after the nano montmorillonite is added is 80 ℃, the stirring temperature after the tackifier is added is 90-110 ℃, the stirring speed is 150-200R/min, and the stirring time is 20-25 min.
  7. 7. The method for preparing a nylon 6 composite material according to claim 5, wherein in S2: drying the nylon for 5-7 hours in a vacuum environment at 110-130 ℃; The drying of the glass fiber and/or the carbon fiber is carried out for 3-4 hours at 80-100 ℃ in a blowing mode.
  8. 8. The method for preparing a nylon 6 composite according to claim 5, wherein: In the step S3, mixing and stirring the dry nylon 6, the pre-dispersed functional filler pre-material, the antioxidant and the rest crosslinking compatilizer in a high-speed mixer, wherein the stirring temperature is 60 ℃, the stirring speed is 150-200R/min, and the stirring time is 3min; in the step S4, during melt blending, the temperature of each region of the double-screw extruder is controlled to be 160-265 ℃ and the screw rotating speed is controlled to be 250-350r/min.
  9. 9. The method for preparing nylon 6 composite material according to claim 8, wherein in the step S4, the length-diameter ratio of the screws of the double-screw extruder is 40-44:1, and the temperatures of all the zones of the extruder are distributed at the temperature of 160-240 ℃ in a feeding section, 240-250 ℃ in a compressing section, 250-260 ℃ in a homogenizing section and 255-260 ℃ in a machine head.
  10. 10. Use of a nylon 6 composite according to any one of claims 1-4, wherein the nylon 6 composite is injection molded to produce a nylon bearing, wherein the injection temperature is 240-260 ℃, the mold temperature is 70-90 ℃, the injection pressure is 90-110MPa, and the dwell pressure is 60-80MPa.

Description

Nylon 6 composite material and preparation method thereof Technical Field The invention relates to a high molecular material modification technology, in particular to a nylon 6 composite material and a preparation method thereof. Background Nylon 6 is widely used for bearing manufacture by virtue of good comprehensive performance, but the traditional nylon 6 has low friction coefficient and is easy to slip in a scene requiring stable friction transmission, and meanwhile, the melt viscosity is low, uneven dispersion is easy to occur when multi-component filler is added, so that the material performance is fluctuated. In the prior art, single friction filler is mostly adopted to improve friction performance, the effect is limited, and the processability is easily sacrificed by simply increasing the viscosity. Therefore, how to improve the friction coefficient and the system viscosity of the material and simultaneously consider the mechanical property and the processing stability becomes the key for developing the high-performance nylon bearing material. Disclosure of Invention The invention aims to solve the problems and provide a nylon 6 composite material, which adopts lamellar potassium titanate whisker as a core friction filler, is reinforced by glass fiber/carbon fiber, is added with a tackifier to regulate viscosity, realizes the cooperative optimization of friction performance, viscosity and mechanical property of the material, and further realizes high viscosity and high friction of the material through prepositioning pre-dispersion process design, blending temperature control and the like in the preparation process. According to the technical scheme, the invention provides a nylon 6 composite material, which comprises nylon 6, lamellar potassium titanate whisker, glass fiber and/or carbon fiber, molybdenum disulfide, nano montmorillonite, a coupling agent, a crosslinking compatilizer, a tackifier and an antioxidant. Further, the raw materials comprise the following components in parts by mass: 60-75 parts of nylon 6; 8-15 parts of lamellar potassium titanate whisker; 5-12 parts of glass fiber and/or carbon fiber; 1-3 parts of molybdenum disulfide; 2-4 parts of nano montmorillonite; 4-5 parts of coupling agent; 3-5 parts of cross-linking compatilizer; 1-2 parts of tackifier; 0.5-1.5 parts of antioxidant. Further, the relative viscosity of the nylon 6 is 2.2-3.8, the nylon 6 is a mixture of low-viscosity nylon 6 with the relative viscosity of 2.4, medium-viscosity nylon 6 with the relative viscosity of 2.8 and high-viscosity nylon 6 with the relative viscosity of 3.4, the mass part ratio of the low-viscosity nylon 6 to the medium-viscosity nylon 6 to the high-viscosity nylon 6 is 20-30:15-20:15-20, the diameter-thickness ratio of the potassium titanate whiskers of the sheet layer is 15-25:1, the diameter of the sheet layer is 5-10 mu m, the glass fibers are alkali-free chopped glass fibers, the length of the glass fibers is 3-5mm, the carbon fibers are PAN-based chopped carbon fibers, the length of the carbon fibers is 2-4mm, and the coupling agent is KH560. Further, the crosslinking compatilizer is maleic anhydride grafted polypropylene or maleic anhydride grafted ethylene-octene copolymer, the tackifier is hydrogenated petroleum resin or terpene resin, and the antioxidant is obtained by compounding antioxidant 1076 and antioxidant 168 according to a mass ratio of 2:1. The second aspect of the present method provides a method for preparing the nylon 6 composite material, comprising the following steps: S1, mixing a coupling agent with absolute ethyl alcohol, then adding lamellar potassium titanate whisker, molybdenum disulfide and nano montmorillonite, mixing, heating and stirring until an object appears to be milky, adding part of a crosslinking compatilizer and all of a tackifier, and continuing stirring to obtain a pre-dispersion functional filler pre-material; S2, drying the nylon 6, the glass fiber and/or the carbon fiber, and controlling the water content to be less than or equal to 0.1% to obtain the dried nylon 6, the dried glass fiber and/or the carbon fiber; s3, mixing and stirring the dry nylon 6, the pre-dispersed functional filler pre-material, the antioxidant and the rest crosslinking compatilizer to obtain a pretreatment material; S4, adding the pretreatment material, the dry glass fiber and/or the carbon fiber into a double-screw extruder, and carrying out melt blending to obtain a blended melt; 6. and S5, extruding, water-cooling and granulating the blending melt to obtain the nylon 6 composite material. Further, in the step S1: Mixing the coupling agent and the absolute ethyl alcohol according to the mass ratio of 1:3, stirring and mixing, and then standing for 2-3 hours; the partial crosslinking compatilizer accounts for 20-30% of the total mass of the crosslinking compatilizer; the mixing of the coupling agent, the absolute ethyl alcohol, the lamellar potassium titanate whisker, th