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CN-122011759-A - Continuous long glass fiber reinforced high-temperature nylon material and preparation method thereof

CN122011759ACN 122011759 ACN122011759 ACN 122011759ACN-122011759-A

Abstract

The invention discloses a continuous long Glass fiber reinforced high-temperature nylon material and a preparation method thereof, wherein the material comprises, by mass, 50% -70% of matrix resin, 30% -50% of continuous alkali-free long Glass fiber (E-Glass), 0.2% -1% of coupling agent based on the mass of the continuous alkali-free long Glass fiber, 0.2% -0.5% of antioxidant system, 0.2% -0.8% of lubricant and 0-0.5% of other auxiliary agents. The invention effectively solves the technical problems of weak interface bonding, insufficient impregnation, single performance and the like of the existing high-temperature nylon reinforced material, and has obvious comprehensive advantages. In the formula, continuous alkali-free long glass fiber is taken as a core reinforcement, a KH-550 coupling agent is matched to construct a firm interface, the shearing strength of the interface is improved by 50 percent compared with that of a traditional short glass fiber material, and nanoparticles and PPS rigid chains are introduced to carry out synergistic modification, so that the bending modulus is up to 19.5GPa, the thermal deformation temperature breaks through 280 ℃, and the synergistic upgrading of the rigidity and the high temperature resistance is realized.

Inventors

  • GUO HONGWU
  • GAO ZHENXING

Assignees

  • 合肥圆燃新材料有限公司

Dates

Publication Date
20260512
Application Date
20260313

Claims (8)

  1. 1. The continuous long Glass fiber reinforced high-temperature nylon material is characterized by comprising, by mass, 50% -70% of matrix resin, 30% -50% of continuous alkali-free long Glass fiber (E-Glass), 0.2% -1% of coupling agent based on the mass of the continuous alkali-free long Glass fiber, 0.2% -0.5% of antioxidant system, 0.2% -0.8% of lubricant and 0-0.5% of other auxiliary agent, wherein the matrix resin is high-temperature nylon, and the high-temperature nylon is selected from at least one of polyphthalamide (PPA) with the long-term use temperature of more than or equal to 150 ℃ and PA6T, PA9T, PA T.
  2. 2. The continuous long glass fiber reinforced high temperature nylon material according to claim 1, wherein the filament diameter of the continuous alkali-free long glass fiber is 10-17 μm, and the fiber bundle linear density is 2400-4800tex.
  3. 3. The continuous filament reinforced high temperature nylon material of claim 1, wherein the coupling agent is selected from the group consisting of aminosilane coupling agents.
  4. 4. The continuous filament reinforced high temperature nylon material of claim 4, wherein said aminosilane coupling agent is KH-550.
  5. 5. The continuous long glass fiber reinforced high-temperature nylon material according to claim 1, wherein the antioxidant system is a compound system of a main antioxidant and an auxiliary antioxidant, the main antioxidant is antioxidant 1010, the auxiliary antioxidant is antioxidant 168, and the mass ratio of the main antioxidant to the auxiliary antioxidant is (1:1) - (2:1).
  6. 6. The continuous filament reinforced high temperature nylon material of claim 1, wherein the lubricant is at least one selected from the group consisting of calcium stearate, silicone powder, polyethylene wax (PE wax), pentaerythritol stearate.
  7. 7. The continuous long glass fiber reinforced high-temperature nylon material according to claim 1, further comprising a synergistic modification component, wherein the synergistic modification component consists of nanoparticles and PPS rigid chains, the nanoparticles are at least one of SiO 2 and ZrC, and the total mass percentage of the synergistic modification component is 1% -5%.
  8. 8. The method for preparing the continuous long glass fiber reinforced high-temperature nylon material according to any one of claims 1 to 7, comprising the following steps: S1, raw material pretreatment, namely placing high-temperature nylon resin into a blast drying oven or a dehumidifying dryer at 120 ℃ to be dried for 4-6 hours, so that the water content of the resin is reduced to below 0.02% (200 ppm); s2, guiding and spreading the fiber, namely maintaining constant tension of continuous alkali-free long glass fiber yarns through a tension control system, and spreading and thinning the continuous alkali-free long glass fiber yarns through a plurality of groups of roller type yarn spreading devices with angle adaptation so as to loosen and uniformly spread fiber bundles; S3, melting and metering the resin, namely adding the dried high-temperature nylon resin, an antioxidant system, a lubricant and other auxiliary agents into a special impregnating screw extruder through a precise metering feeder, setting heating temperature according to the melting point and melt index partition of the high-temperature nylon resin, melting and plasticizing the resin, and controlling the processing temperature to be 290-315 ℃; s4, melt impregnation, namely conveying the molten resin to a customized impregnation die head, and converging the molten resin and the unfolded glass fiber bundles into the die head synchronously, wherein the high-pressure melt in the die head permeates and tightly coats each glass fiber monofilament; S5, cooling, shaping and granulating, namely extruding the impregnated fiber/resin composite material from a die head, immediately feeding the fiber/resin composite material into a cooling water tank for rapid cooling and solidification, drawing the fiber/resin composite material at a constant speed by a drawing roll, and finally cutting the fiber/resin composite material into granules with the diameter of 6-12 mm by a granulator.

Description

Continuous long glass fiber reinforced high-temperature nylon material and preparation method thereof Technical Field The invention relates to the field of high-temperature nylon materials, in particular to a continuous long glass fiber reinforced high-temperature nylon material and a preparation method thereof. Background With the development of the automobile industry to light weight and high reliability, the requirements of electronic and electrical equipment on the comprehensive performance of structural materials in the field of aerospace are increasingly stringent, and high-temperature nylon materials have become one of core engineering plastics for replacing metal parts due to the excellent high-temperature resistance, chemical corrosion resistance and dimensional stability. However, the mechanical strength, rigidity and heat deformation resistance of the pure high-temperature nylon still cannot meet the requirements of high-end scenes, such as peripheral components of an automobile engine, heat dissipation structural members of electronic equipment and the like, so that the comprehensive performance of the nylon is required to be improved through a fiber reinforcement technology. At present, the high-temperature nylon reinforcement and modification mainly adopts two technical paths of short glass fiber reinforcement and continuous long glass fiber reinforcement. Although the short glass fiber reinforced material has good processing fluidity and lower cost, the fiber is easy to break in the processing process, the length is shorter (generally less than 1 mm), the load transfer efficiency is limited, the impact resistance and fatigue resistance of the material are not obviously improved, and the performance decay is faster under long-term high-temperature use. The continuous long glass fiber reinforced thermoplastic plastic (LFT) has the advantages of consistent fiber length with the granules (6-12 mm) and direct and efficient load transmission, is obviously superior to a short glass fiber reinforced material in strength, rigidity and fatigue resistance, and becomes a preferable scheme of a high-end scene. However, the existing continuous long glass fiber reinforced high-temperature nylon material and the preparation process still have a plurality of technical problems: 1. the interfacial compatibility is poor, the polarity difference between the high-temperature nylon matrix and the glass fiber surface is obvious, the interfacial adhesion is weak, the phenomenon of 'debonding' is easy to occur, the mechanical properties of the composite material are not fully exerted, and especially the interlayer shear strength is low; 2. The dipping quality is poor, the high-temperature nylon has high melt viscosity and narrow processing window (usually only 20-30 ℃), the traditional dipping die head is difficult to form a uniform high-pressure field, the fiber bundles are not sufficiently unfolded, dry yarns (fibers which are not immersed by resin) are easy to appear, and the reinforcing effect is seriously influenced; 3. The processing and use stability is not enough, the high-temperature nylon has high moisture absorption rate, a plurality of dryness before processing is not thorough, the product is easy to generate bubbles and silver marks, the resin is easy to generate thermooxidative aging in the high-temperature processing process, and the service life of the material is influenced; 4, the function is single, the existing enhancement system only focuses on the improvement of mechanical properties, lacks the design of cooperative optimization of lubricity and rigidity, and is difficult to meet the low friction requirement and the high rigidity requirement of a complex structure in the assembly process of parts. Disclosure of Invention The invention aims to provide a continuous long glass fiber reinforced high-temperature nylon material and a preparation method thereof, which are used for solving the technical problems in the background technology. The technical scheme of the invention provides a continuous long Glass fiber reinforced high-temperature nylon material, which comprises, by mass, 50% -70% of matrix resin, 30% -50% of continuous alkali-free long Glass fiber (E-Glass), 0.2% -1% of coupling agent based on the mass of the continuous alkali-free long Glass fiber, 0.2% -0.5% of antioxidant system, 0.2% -0.8% of lubricant and 0-0.5% of other auxiliary agent, wherein the matrix resin is high-temperature nylon, and the high-temperature nylon is selected from at least one of polyphthalamide (PPA) with the long-term use temperature of more than or equal to 150 ℃ and PA6T, PA 9: 9T, PA 10T. In a preferred embodiment, the continuous alkali-free long glass fiber has a filament diameter of 10-17 μm and a fiber bundle linear density of 2400-4800tex. In a preferred embodiment, the coupling agent is selected from aminosilane coupling agents that are capable of forming chemically bonded molecular bridges between the